CROSS-REFERENCE TO RELATED APPLICATIONS
TECHNICAL FIELD
[0002] The present disclosure relates to the field of relay technology, and more particularly,
to a magnetic latching relay capable of resisting a short-circuit current.
BACKGROUND
[0003] The structure of the existing magnetic latching relay is composed of a magnetic circuit
system, a contact system, a push mechanism and a base. The magnetic circuit system
generally consists of two substantially symmetrical magnetic circuits, including a
stationary magnetizer component, a movable magnetizer component and a coil. The contact
system includes a moving spring portion, a stationary spring portion, and the push
mechanism is generally carried by the push block. When the relay is inputted forward
pulse voltage, the magnetic circuit system works and the push block pushes the moving
spring portion to make the static and movable contacts contact with each other, and
the relay works. The coil is inputted with the reverse pulse voltage, the magnetic
circuit system works, the push block pushes the moving spring portion to make the
static and movable contacts to be disconnected, and the relay returns.
[0004] The main application area of the magnetic latching relay is power metering. The main
functions are switching and metering. With the power grid reforms of countries around
the world move forward, cases of electric meter explosions and fires caused by short-circuit
currents have occasionally occurred, causing huge personal safety problems and property
losses. In this context, the world's major power companies, meter companies have introduced
relevant standards or cited industry standards to regulate the ability of magnetic
latching relays in electric energy meter to resist a short-circuit current, which
improving the operating safety of smart meters. In order to ensure personal safety
and safety of electrical device, the magnetic latching relay is required to have the
function of withstanding and turning on the short-circuit current. According to the
operating characteristics of the power grid and based on the consideration of personal
and equipment safety, there are three working conditions for magnetic latching relay
to resist the short-circuit, details as follow:
[0005] Case 1: When the front end of the electric meter (upstream of the power grid) is
in short-circuit condition, the characteristics is that latching relay contacts will
close (the electric meter is turned on) and the short-circuit current is high which
is called "safe withstand short-circuit current" at the moment,, and it is required
that the magnetic latching relay is "no explosion, no fire and no spatter" when or
after subjected to a short-circuit current.
[0006] Case 2: The back end of the electric meter (downstream of the power grid) is short-circuit,
characterized by the magnetic latching relay contacts closing (the electric meter
is turned off), and the short-circuit current is smaller. The short-circuit current
at this time is called "function withstand short-circuit current", and it is required
that the magnetic latching relay is "in normal function after subjected to a short-circuit
current.
[0007] Case 3: When back end of the electric meter (downstream of the power grid) is in
short-circuit condition, characteristics is that latching relay contacts is open (the
electric meter is turned off), and the short-circuit current is lower, and it is required
that the magnetic latching relay is "in normal function" after supported with short-circuit
current.
[0008] Under three operating conditions, the magnitude of the short-circuit current varies
greatly. For example, "safety withstand short-circuit current" of IEC62055-31 standard
UC2 grade is 4.5KA, which is 1.8 times of "function withstand short-circuit current"
or "function turning on short-circuit current". The UC3 grade "safety withstand short-circuit
current" is 6KA, which is twice as much as the "function withstand short-circuit current"
or "function making short-circuit current". Another example, the ANSI C12.1 standard
200A rated current level "safety withstand short circuit current" peak is 24KA, which
is 3.4 times of the "function withstand short circuit current" whose peak is 7KA
[0009] To develop a magnetic latching relay product capable of resisting a short-circuit
current, it is necessary to increase the closing pressure of the moving and stationary
contacts to counteract the electric repulsion when the short-circuit current passes
through the contacts. Increasing the closing pressure of the moving and stationary
contacts will inevitably increase the external dimensions of the product and increase
the power consumption of the coil control portion, which fails to meet the requirements
of the customer for miniaturization and low power consumption. At the same time, product
costs will rise sharply, which results in a decline in the market competitiveness
of the product.
[0010] In order to solve the technical problems described above the existing magnetic latching
relay utilizes the principle of Lorentz force in structural design, and the electromagnetic
force generated by the one times short-circuit current on the movable spring piece
(moving spring piece) to resist the electric repulsion generated by the short-circuit
current between the moving and stationary contacts. When designing a specific scheme,
the magnitude of the short-circuit current is closely related to the distance between
the two spring pieces. The effect of resisting the short-circuit current is closely
related to the amount of spring piece deformation (rigidity). Since "safety withstand
short-circuit current" is quite different from "function withstand short-circuit current"
or "function turning on short-circuit current", design schemes that meet the "safety
withstand short-circuit current" are not necessarily compatible with "function withstand
short-circuit current" or "function turning on short-circuit current" and vice versa.
Similarly, design schemes that meet the UC3 standard may not be necessarily backward
compatible with the UC2 standard.
[0011] There are two main technical routes in the prior art for solving the function of
the magnetic latching relay to resist a short-circuit current. Both use one time short-circuit
current to flow through the movable spring piece (ie, the moving spring piece) and
the movable spring piece lead-out piece (ie, the moving spring lead-out piece), and
the electromagnetic force generated on the movable spring piece (ie, the moving spring
piece) resists the electric repulsion generated by the short-circuit current between
the moving and stationary contacts. The short-circuit current flowing through the
stationary spring piece (ie, the stationary spring piece) does not participate in
the function of resisting the electric repulsion between the contacts. The anti-short
circuit current structure of the first type of magnetic latching relay is "the electromagnetic
force generated when the moving spring lead-out piece and the moving spring piece
are opposite in direction of current is used to resist the electric power generated
when the moving and stationary contacts pass a large current". The anti-short circuit
current structure of the second type of magnetic latching relay is "using the electromagnetic
force generated by the same current direction in the parallel circuit to increase
the pressure between the moving and stationary contacts and to achieve the function
of resisting the short circuit current". One of the schemes for resisting the short-circuit
current structure is disclosed as in Chinese patent
CN201210306861.9, the two sets of moving springs are designed in parallel, and the current same direction
attracting principle is used to increase the contact pressure of the contacts. However,
the shortcomings of this structure are: The moving spring piece has a short effective
length and a large reaction force. The distance between the two sets of moving spring
portions is smaller at a position away from the contact and at the position near the
contact is larger, which resulting in a smaller electromagnetic attraction at the
contact position, and having the disadvantage of uneven electromagnetic attraction
distribution. Moreover, since a bending is placed at a position close to the contact,
a structure similar to the seesaw is caused, and instead, the spring piece at the
position of the contact is easily turned outward, and the pressure of the contact
is reduced. The second scheme for resisting the short-circuit current structure is
disclosed as in Chinese patent
CN201280008648.2, the two sets of moving springs will also designed in parallel, the current same
direction attracting principle is used to increase the contact pressure of the contacts.
However, the shortcomings of this structure are: The effective length of the moving
spring piece is short, the reaction force is large, and the distance between the two
sets of moving spring portions is large due to the spacing of the moving and stationary
contacts, which resulting in less electromagnetic attraction. Moreover, the spring
piece of this structure has small elasticity and a small pressure on the contacts.
SUMMARY
[0012] One object of the present disclosure is to overcome the deficiencies of the prior
art and to provide a magnetic latching relay capable of resisting a short-circuit
current. It is based on increasing the pressure between the moving and stationary
contacts by using the electromagnetism suction generated by the same current direction
in the parallel circuit. Through improving the structure of the contact portion, the
electromagnetic suction between the two sets of moving spring portions can be increased,
thereby the contact pressure between the contacts can be effectively increased to
resist the short-circuit current.
[0013] The technical solution adopted by the present disclosure to solve the technical problem
thereof is: a magnetic latching relay capable of resisting short-circuit current,
comprising:
contact portion, composed of two sets of moving spring portions which are substantially
parallel to each other;
the two sets of moving spring portions respectively includes a moving spring piece,
a moving contact, a moving spring lead-out piece and a stationary contact; the moving
contact is connected to one end of the moving spring piece, the other end of the moving
spring piece is connected to one end of the moving spring lead-out piece, and the
stationary contact is connected to one end of the moving spring lead-out piece; two
moving contacts of the moving spring portion respectively correspond to two stationary
contacts to form a parallel circuit structure when the moving and stationary contacts
are in contact;
each of the two moving spring pieces is provided with a first bent portion which is
convex on one side of the thickness and concave on the other side, and the protruding
directions of the two first bent portions are the same, the bending of the first bent
portion of one moving spring piece is smaller than the bending of the first bent portion
of the other moving spring piece, such that the protrusion of the first bent portion
of one moving spring can fit into the recess of the first bent portion of the other
moving spring piece, thereby the effective length of each moving spring pieces is
increased while reducing the distance between the two moving spring pieces.
[0014] Each of the two moving spring pieces is provided with a second bent portion which
is convex on one side of the thickness and concave on the other side, and the protruding
directions of the two second bent portions are the same, the bending of the second
bent portion of the other moving spring piece is smaller than the bending of the second
bent portion of one moving spring piece, such that the protrusion of the second bent
portion of the other moving spring piece can fit into the recess of the second bent
portion of one moving spring piece to reduce the distance between the two moving spring
pieces and increase the effective length of each moving spring pieces.
[0015] The first bent portion and the second bent portion are all arc shapes.
[0016] The shape of the first bent portions and the second bent portions of the two moving
spring pieces may substantially be U-shaped, n-shaped or C-shaped, and the center
line of the opening of the U-shaped, n-type or C-shaped of the bent portion is substantially
perpendicular to a flat spring piece of the moving spring piece.
[0017] In the two moving spring pieces, the distance from a flat spring piece between the
first bent portion and the second bent portion of one moving spring piece to a flat
spring piece between the first bent portion and the second bent portion of the other
moving spring piece is smaller than the distance between the flat spring pieces at
the contact position of the two moving spring pieces.
[0018] The distance from the flat spring piece between the first bent portion and the second
bent portion of one moving spring piece to the flat spring piece between the first
bent portion and the second bent portion of the other moving spring piece is roughly
equal to the distance between the two first bent portions and the second bent portions.
[0019] In the same set moving spring portion, the stationary contact is connected at the
junction of the other end of the moving spring piece and one end of the moving spring
lead-out piece.
[0020] In the same moving spring piece, the protruding direction of the first bent portion
is opposite to the protruding direction of the second bent portion.
[0021] In the same moving spring piece, the first bent portion and the second bent portion
are respectively located at both ends of the moving spring piece.
[0022] The moving spring piece and the moving spring lead-out piece are two separate parts.
[0023] The moving spring piece and the moving spring lead-out piece are an integrated structure.
[0024] The moving spring piece is formed by a single spring piece.
[0025] The moving spring piece is composed of two or more spring pieces stacked in the thickness
direction.
[0026] The lengths and shapes of the moving spring pieces of the two sets of moving spring
portions having the first bent portions and the second bent portions are completely
the same.
[0027] Further includes a base, the moving spring lead-out pieces of the contact portion
are inserted on the base, and the two moving spring lead-out pieces are respectively
located on both sides of the base, one of the moving spring lead-out pieces is a current
lead-in end, and the other moving spring lead-out piece is a current lead-out end;
each end of the two moving spring lead-out pieces is respectively fitted in the base,
and the other ends of the two moving spring lead-out pieces respectively extend outside
of the base.
[0028] The two moving spring lead-out pieces are respectively provided with a positioning
protrusion for matching with the base in the thickness direction, and the base is
provided with a slot for matching with the positioning protrusion of the corresponding
moving spring lead-out piece.
[0029] A positioning tongue piece extends outwardly from one end of each of the moving spring
lead-out piece, the positioning tongue piece inclines at an angle with respect to
the moving spring lead-out piece to avoid the bent portion of the moving spring piece.
[0030] The thickness of the positioning tongue piece is smaller than the thickness of the
moving spring lead-out piece.
[0031] The vertical distance of the extension line of the opposite sides of the two moving
spring lead-out pieces is 4.6 mm, and the tolerance range is -0.1 to +0.5 mm; in the
two moving spring lead-out pieces, the size of the opposite side of one moving spring
lead-out piece closer to a parallel side wall of the base to the outer surface of
the parallel side wall is 5.1 mm, and the tolerance range is -0.5 to +0.5mm.
[0032] Further includes a rotary magnetic circuit portion and a push block, the rotary magnetic
circuit portion respectively matches with the ends of the two moving spring pieces
through the push block, such that the two moving contacts are respectively brought
into contact with the two stationary contacts when the rotary magnetic circuit portion
rotates towards to one side, and the two moving contacts are respectively separated
from the two stationary contacts when the rotary magnetic circuit portion rotates
toward to the other side.
[0033] Compared with the prior art, the beneficial effects of the present disclosure are:
- 1. Due to the present disclosure adopts that each of the two moving spring pieces
is provided with a first bent portion which is convex on one side of the thickness
and concave on the other side, the protruding directions of the two first bent portions
are the same, the bending of the first bent portion of one moving spring piece is
smaller than the bending of the first bent portion of the other moving spring piece,
so that the protrusion of the first bent portion of the one moving spring can fit
into the recess of the first bent portion of the other moving spring piece, thereby
the effective length of each moving spring pieces is increased while reducing the
distance between the two moving spring pieces. In the structure of the present disclosure,
on one hand, the spring piece bending is used to increase the elasticity of the moving
spring piece, thereby increasing the contact pressure; on the other hand, the special
structure of the bent portion (the convex fits in the recess) is used to short the
distance between the two moving spring pieces, thereby increasing the suction force.
At the same time, since the spring piece is bent, the effective length of the moving
spring piece is longer, thereby further increasing the suction force and making the
suction force larger.
- 2. Due to the present disclosure adopts that a first bent portion and a second bent
portion are respectively disposed in the two moving spring pieces, and the first bent
portion and the second bent portion have the same protruding direction in the two
moving spring pieces, while in the same moving spring, the protruding direction of
the first bent portion is opposite to the protruding direction of the second bent
portion. In the structure of the present disclosure, since each moving spring piece
is provided with two bendings, the elasticity of the moving spring piece can be greatly
increased, thereby greatly increasing the contact pressure, such that the effective
length of the moving spring piece is further increased. Thereby the suction force
is further increased, so that the suction force is increased larger. Moreover, not
only the distance between the two bent positions of the two moving spring pieces can
be reduced, but also the distance between the two bendings of the two moving spring
pieces can be reduced, thereby further increasing the suction force.
- 3. Due to the present disclosure adopts that a first bent portion and a second bent
portion are respectively disposed in the two moving spring pieces and the lengths
and shapes of the two sets of moving spring portions having the first bent portion
and the second bent portion are completely the same. In the structure of the present
disclosure, the two sets of moving spring pieces have the same length and the same
shape, which is convenient for manufacturing and ensures the consistency of the performance
of the two sets of moving springs.
- 4. The present disclosure adopts that a moving spring lead-out piece has a positioning
protrusion for matching with the base in the thickness direction, a positioning tongue
piece extends outwardly at one end of the moving spring lead-out piece, and the positioning
tongue piece inclines at an angle with respect to the moving spring lead-out piece
to avoid the bent portion of the moving spring piece. In the structure of the present
disclosure, through the reasonable positioning for the moving spring lead-out piece,
it avoids the disadvantages of the product function failure due to the looseness and
falling off of the moving spring lead-out piece because of the unreliable positioning
during the use of the product. The looseness and falling off of the moving spring
lead-out piece are due to the external stress of temperature and vibration shock.
[0034] The present disclosure will be further described in detail below with reference to
the accompanying drawings and embodiments. However, a magnetic latching relay capable
of resisting a short-circuit current of the present disclosure is not limited to the
embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
[0035]
Fig. 1 is a structure schematic view showing a contact portion of the present disclosure;
Fig. 2 is a structure schematic perspective view showing the cooperation among the
contact portion and a magnetic circuit portion and a push block of the present disclosure;
Fig. 3 is a structure schematic view showing the cooperation among the contact portion
and the magnetic circuit portion and the push block (contacts closing) of the present
disclosure;
Fig. 4 is a structure schematic view showing the cooperation among the contact portion
and the magnetic circuit portion and the push block (contact turning off) of the present
disclosure;
Fig. 5 is a structure schematic perspective view showing the moving spring portion
of the present disclosure;
Fig. 6 is a front view showing the moving spring portion of the present disclosure;
Fig. 7 is a top view showing the moving spring portion of the present disclosure;
Fig. 8 is a structure schematic perspective disassemble view showing the moving spring
portion of the present disclosure;
Fig. 9 is a front view showing the perspective structure disassemble state of the
moving spring portion of the present disclosure;
Fig. 10 is a structure schematic perspective view showing the cooperation among the
contact portion and the magnetic circuit portion and the push block and the base of
the present disclosure; and
Fig. 11 is a top view showing the cooperation among the contact portion and the magnetic
circuit portion and the push block and the base of the present disclosure.
DETAILED DESCRIPTION
Embodiments
[0036] Referring to Fig. 1 to Fig. 11, a magnetic latching relay capable of resisting a
short-circuit current according to the present disclosure includes a contact portion.
The contact portion is composed of two sets of moving spring portions 1, 2 which are
substantially parallel to each other. The moving spring portion 1 includes a moving
spring piece 11, a moving contact 12, a moving spring lead-out piece 13 and a stationary
contact 14. The moving spring portion 2 includes a moving spring piece 21, a moving
contact 22, a moving spring lead-out piece 23 and a stationary contact 24. The moving
contact 12 is connected to one end of the moving spring piece 11, the other end of
the moving spring piece 11 is connected to one end of the moving spring lead-out piece
13, and the stationary contact 14 is connected to one end of the moving spring lead-out
piece 13. In the present embodiment, the stationary contact 14 is connected at the
junction of the other end of the moving spring piece 11 and one end of the moving
spring lead-out piece 13. Similarly, the moving contact 22 is connected to one end
of the moving spring piece 21, and the other end of the moving spring piece 21 is
connected to one end of the moving spring lead-out piece 23, the stationary contact
24 is connected to one end of the moving spring lead-out piece 23, and the stationary
contact 24 is connected at the junction of the other end of the moving spring piece
21 and one end of the moving spring lead-out piece 23. The two moving contacts of
the moving spring portion correspond to the two stationary contacts respectively.
That is, the moving contact 12 of the moving spring portion 1 and the stationary contact
24 of the moving spring portion 2 are in a correspondingly engaged position, and the
moving contact 22 of the moving spring portion 2 and the stationary contact 14 of
the moving spring portion 1 are in a correspondingly engaged position to form a parallel
circuit structure when the moving and stationary contacts are in contact. Each of
the two moving springs is provided with a first bent portion which is convex on one
side of the thickness and concave on the other side. The moving spring piece 11 is
provided with a first bent portion 111, and the first bent portion 111 is in an arc
shape. The moving spring piece 21 is provided with a first bent portion 211, and the
first bent portion 211 has an arc shape. The first bent portion 111 of the moving
spring piece 11 and the first bent portion 211 of the moving spring piece 21 have
the same protruding direction. The bending of the first bent portion 211 of the moving
spring piece 21 is smaller than the bending of the first bent portion 111 of the other
moving spring piece 11, such that the protrusion of the first bent portion 211 of
one moving spring piece 21 can fit into the recess of the first bent portion 111 of
the other moving spring piece 11. Thereby, compared with the provision of the two
flat moving spring pieces in parallel of the relate technology, the effective length
of each of the moving spring pieces is increased while reducing the distance between
the two moving spring pieces 11, 12.
[0037] The two moving spring pieces are each further provided with a second bent portion
which is convex on one side of the thickness and concave on the other side. That is,
the moving spring piece 11 is provided with a second bent portion 112, and the second
bent portion 112 has an arc shape; the moving spring piece 21 is provided with a second
bent portion 212, and the second bending 212 has an arc shape. The second bent portion
112 of the moving spring piece 11 and the second bent portion 212 of the moving spring
piece 21 have the same protruding direction. The bending of the second bent portion
112 of the moving spring piece 11 is smaller than the bending of the second bent portion
212 of one moving spring piece 21, such that the protrusion of the second bent portion
112 of the other moving spring piece 11 can fit into the recess of the second bent
portion 212 of one moving spring piece 21. In the same moving spring piece, the protruding
direction of the first bent portion is opposite to the protruding direction of the
second bent portion. In the moving spring piece 11, the protruding direction of the
first bent portion 111 is opposite to the protruding direction of the second bent
portion 112. In the moving spring piece 21, the protruding direction of the first
bent portion 211 is opposite to the protruding direction of the second bent portion
212. Moreover, in the same moving spring piece, the first bent portion and the second
bent portion are located at both ends of the moving spring piece respectively. Since
the protrusion of the first bent portion 211 of the moving spring piece 21 fits into
the recess of the first bent portion 111 of the moving spring piece 11, and the protrusion
of the second bent portion 112 of the moving spring piece 11 fits into the recess
of the second bent portion 212 of the moving spring piece 21 to reduce the distance
between the two moving spring pieces and increase the effective length of each moving
spring piece.
[0038] The shape of the first bent portion and the second bent portion of the two moving
spring pieces may substantially be U-shaped, n-shaped or C-shaped, and the center
line of the opening of U-shaped, n-type or C-shaped of the bent portion is substantially
perpendicular to the flat spring piece of the moving spring piece. The shape of the
U-shaped, n-shaped or C-shaped all conforms to concave on one side of the thickness
and concave on the other side.
[0039] In the two moving spring pieces, among them, the distance from the flat spring piece
between the first bent portion and the second bent portion of one moving spring piece
to the flat spring piece between the first bent portion and the second bent portion
of the other moving spring piece is smaller than the distance between the flat spring
pieces at the contact position of the two moving spring pieces. A portion between
the first bent portion 111 and the second bent portion 112 of the moving spring piece
11 is a flat spring piece 113, and a portion between the first bent portion 211 and
the second bent portion 212 of the moving spring piece 21 is a flat spring piece 213.
The distance from the flat spring piece 113 of the moving spring piece 11 to the flat
spring piece 213 of the moving spring piece 21 is smaller than the distance between
the flat spring pieces at the contact position of the two moving spring pieces (For
example, the distance between the spring piece at the moving contact 12 and the spring
piece at the stationary contact 24, and may also be the distance between the spring
piece at the moving contact 22 and the spring piece at the stationary contact 14).
[0040] In the present embodiment, among them, the distance from the flat spring piece between
the first bent portion and the second bent portion of one moving spring piece to the
flat spring piece between the first bent portion and the second bent portion of the
other moving spring piece is substantially equal to the distance between the two first
bent portions and the distance between the two second bent portions. That is to say,
the distance from the first bent portion 111 of the moving spring piece 11 to the
first bent portion 211 of the moving spring piece 21, the distance from the second
bent portion 112 of the moving spring piece 11 to the second bent portion 212 of the
moving spring piece 21, and the distance from the flat spring piece 113 of the moving
spring 11 to the flat spring piece 213 of the moving spring piece 21 are roughly equal
to each other.
[0041] In the present embodiment, the moving spring piece 11 and the moving spring lead-out
piece 13 are two separate parts. The moving spring piece 21 and the moving spring
lead-out piece 23 are also two separate parts. Of course, the moving spring piece
and the moving spring lead-out piece can also be an integrated structure.
[0042] In the present embodiment, the moving spring piece 11 is formed by stacking three
spring pieces in the thickness direction, and the moving spring piece 21 is also formed
by stacking three spring pieces in the thickness direction. Of course, the moving
spring piece can also be formed by a single spring piece.
[0043] In the present embodiment, the lengths and shapes of the moving spring pieces 11,
12 of the two sets of moving spring portions having the first bent portion and the
second bent portion are completely the same. That is to say, after the moving spring
piece 11 and the moving spring piece 12 are assembled, the matching shape of the first
bent portion 111 of the moving spring piece 11 and the first bent portion 211 of the
moving spring piece 21 as well as the matching shape of the second bent portion 212
of the moving spring piece 21 and the second bent portion 112 of the moving spring
piece 11 are in a central symmetry structure. In other words, after the matching shape
of the first bent portion 111 of the moving spring piece 11 and the first bent portion
211 of the moving spring piece 21 rotates by 180 degrees around the symmetry center,
which is the same as the matching shape of the second bent portion 212 of the moving
spring piece 21 and the second bent portion 112 of the moving spring piece 11.
[0044] The present disclosure includes a base 3, the moving spring lead-out pieces 13, 23
of the contact portion are respectively inserted on the base 3, and the two moving
spring lead-out pieces 13, 23 are respectively located on both sides of the base 3.
Among them, one of the moving spring lead-out pieces is a current lead-in end, and
the other moving spring lead-out piece is a current lead-out end. Each end of the
moving spring lead-out pieces 13, 23 fits in the base 3, and each other end of the
moving spring lead-out pieces 13, 23 extends outside the base 3.
[0045] In the present embodiment, the moving spring lead-out piece 13 is provided with a
positioning protrusion 131 for matching with the base in the thickness direction.
The positioning protrusion 131 locates on the opposite side corresponding to the fixed
stationary contact 14 and locates closer to the outside than the stationary contact
14 in position. The base 3 is provided with a slot 31 for matching with the positioning
protrusion 131 of the moving spring lead-out piece 13. The moving spring lead-out
piece 23 is provided with a positioning protrusion 231 for matching with the base
in the thickness direction. The positioning protrusion 231 locates on the same side
corresponding to the fixed stationary contact 24 and locates closer to the outside
than the stationary contact 24 in position. The base 3 is also provided with a slot
32 for matching with the positioning protrusion 231 of the moving spring lead-out
piece 23.
[0046] In the present embodiment, a positioning tongue piece 132 extends outwardly from
one end of the moving spring lead-out piece 13. The positioning tongue piece 132 inclines
at an angle with respect to the moving spring lead-out piece 13 to avoid the bent
portion 111 of the moving spring piece 11. The thickness of the positioning tongue
piece 132 is smaller than the thickness of the moving spring lead-out piece 13. The
base 3 is provided with a slot 33 for matching with the positioning tongue piece 132
of the moving spring lead-out piece 13. A positioning tongue piece 232 extends outwardly
from one end of the moving spring lead-out piece 23. The positioning tongue piece
232 inclines at an angle with respect to the moving spring lead-out piece 23 to avoid
the bent portion 211 of the moving spring piece 21. The thickness of the positioning
tongue piece 232 is smaller than the thickness of the moving spring lead-out piece
23. The base 3 is provided with a slot 34 for matching with the positioning tongue
piece 232 of the moving spring lead-out piece 23.
[0047] In the present embodiment, the vertical distance of the extension lines of the opposite
sides of the two moving spring lead-out pieces is 4.6 mm, and the tolerance range
is -0.1 to +0.5 mm. That is, the vertical distance of the extension line of the opposite
side 133 of the moving spring lead-out piece 13 to the opposite side 233 of the moving
spring lead-out piece 23 is 4.6 mm (may also be the vertical distance from the extension
line of the opposite side 233 of the moving spring lead-out piece 23 to the opposite
side 133 of the moving spring lead-out piece 13, or the vertical distance from the
extension line of the opposite side 133 of the moving spring lead-out piece 13 to
the extension line of the opposite side 233 of the moving spring lead-out piece 23).
The size of 4.6mm defines the distance between the two moving spring lead-out pieces,
and also defines the distance between the contacts. In the two moving spring lead-out
pieces, the size of the opposite side of a moving spring lead-out piece closer to
the parallel side wall of the base to the outer surface of the parallel side wall
is 5.1 mm, and the tolerance range is -0.5 to +0.5mm. In the moving spring lead-out
piece 13 and the moving spring lead-out piece 23, closer to the parallel side wall
35 of the base 3 is the moving spring lead-out piece 13. Therefore, the size of the
opposite side 133 of the moving spring lead-out piece 13 to the outer surface of the
parallel side wall 35 is 5.1 mm, and the tolerance range is -0.5 to +0.5 mm. The size
of 5.1 mm reflects the distance of the moving spring lead-out piece 13 to one side
of the base, which determines the position at which the moving spring lead-out piece
13 leads out from the base. The size of 4.6mm and the size of 5.1mm can reflect the
position of the other moving spring lead-out piece 23 leaded out from the base, thus
determining the main physical dimensions of the relay.
[0048] The present disclosure includes a rotary magnetic circuit portion 4 and a push block
5. The rotary magnetic circuit portion 4 and the push block 5 are respectively mounted
in the base 3. The rotary magnetic circuit portion 4 respectively matches with the
ends of the two moving spring pieces 11,21 through the push block 5, such that the
two moving contacts 12, 22 are respectively brought into contact with the two stationary
contacts 24, 14 when the rotary magnetic circuit portion rotates to one side, and
the two moving contacts 12, 22 are respectively separated from the two stationary
contacts 24, 14 when the rotary magnetic circuit portion rotates toward the other
side.
[0049] A magnetic latching relay capable of resisting short-circuit current according to
the present disclosure adopts that each of the two moving spring pieces 11 and 21
is provided with a first bent portion 111, 211 which is convex on one side of the
thickness and concave on the other side. The first bent portions 111 and 211 are in
arc shapes, and the protruding directions of the two first bent portions 111 and 211
are the same. Among them, the bending of the first bent portion 211 of one moving
spring piece 21 is smaller than the bending of the first bent portion 111 of the other
moving spring piece 11, such that the protrusion of the first bent portion 211 of
the one moving spring piece 21 can fits into the recess of the first bent portion
111 of the other moving spring piece 11. Thereby, the effective length of each of
the moving spring pieces is increased while reducing the distance between the two
moving spring pieces. In the structure of the present disclosure, on one hand, the
spring piece bending is used to increase the elasticity of the moving spring piece,
thereby increasing the contact pressure; on the other hand, the special structure
of the bent portion (the convex fits in the recess) is used to short the distance
between the two moving spring pieces, thereby increasing the suction force. At the
same time, since the spring piece is bent, the effective length of the moving spring
piece is longer, thereby further increasing the suction force and making the suction
force larger.
[0050] A magnetic latching relay capable of resisting short-circuit current according to
the present disclosure adopts that the first bent portions 111, 211 and the second
bent portions 112, 212 are respectively disposed in the two moving spring pieces 11,
21, and the first bent portions 111, 211 and the second bent portions 112, 212 are
all arc shapes. The first bent portion and the second bent portion have the same convex
direction in the two moving spring pieces, while in the same moving spring, the protruding
direction of the first bent portion is opposite to the protruding direction of the
second bent portion. In the structure of the present disclosure, since each moving
spring piece is provided with two bendings, the elasticity of the moving spring piece
can be greatly increased, thereby greatly increasing the contact pressure, such that
the effective length of the moving spring piece is further increased. Thereby the
suction force is further increased, such that the suction force is increased larger.
Moreover, not only the distance between the two bent positions of the two moving spring
pieces can be reduced, but also the distance between the two bent portions of the
two moving spring pieces can be reduced, thereby further increasing the suction force.
[0051] A magnetic latching relay capable of resisting a short-circuit current according
to the present disclosure adopts that a first bent portion and a second bent portion
are respectively disposed in the two moving spring pieces and the length and shape
of the two sets of moving spring portions having the first bent portion and the second
bent portion are completely the same. In the structure of the present disclosure,
the two sets of moving spring pieces have the same length and the same shape, which
is convenient for manufacturing and ensures the consistency of the performance of
the two sets of moving springs.
[0052] A magnetic latching relay capable of resisting short-circuit current according to
the present disclosure adopts positioning protrusions 131 and 231 for matching with
the base are disposed in the thickness direction of the moving spring lead-out pieces
13 and 23. Positioning tongue pieces 132, 232 extends outwardly at one end of the
moving spring lead-out pieces 13, 23, and the positioning tongue pieces 132, 232 inclines
at an angle with respect to the moving spring lead-out pieces 13, 23 to avoid the
bent portion of the moving spring piece. In the structure of the present disclosure,
through the reasonable positioning for the moving spring lead-out piece, it avoids
the disadvantages of the product function failure due to the looseness and falling
off of the moving spring lead-out piece because of the unreliable positioning during
the use of the product. The looseness and falling off of the moving spring lead-out
piece are due to the external stress of temperature and vibration shock.
[0053] The above described are only preferred embodiments of the disclosure and are not
intended to limit the disclosure in any way. Although the disclosure has been described
as above in the preferred embodiments, it is not intended to limit the disclosure.
Any person skilled in the art can make many possible variations and modifications
to the technical solutions of the present disclosure or modify to equivalent embodiments
by using the above-disclosed technical contents without departing from the scope of
the technical solutions of the present disclosure. Therefore, any simple modifications,
equivalent changes and modifications to the above embodiments in accordance with the
technology substance of the present disclosure without departing from the technical
solution of the present disclosure should all fall within the scope of the present
disclosure.
1. A magnetic latching relay capable of resisting short-circuit current, comprising:
contact portion, composed of two sets of moving spring portions which are substantially
parallel to each other;
wherein the two sets of moving spring portions respectively comprises a moving spring
piece, a moving contact, a moving spring lead-out piece and a stationary contact;
the moving contact is connected to one end of the moving spring piece, the other end
of the moving spring piece is connected to one end of the moving spring lead-out piece,
and the stationary contact is connected to one end of the moving spring lead-out piece;
two moving contacts of the moving spring portion respectively correspond to two stationary
contacts to form a parallel circuit structure when the moving and stationary contacts
are in contact;
wherein each of the two moving spring pieces is provided with a first bent portion
which is convex on one side of the thickness and concave on the other side, and the
protruding directions of the two first bent portions are the same, wherein the bending
of the first bent portion of one moving spring piece is smaller than the bending of
the first bent portion of the other moving spring piece, such that the protrusion
of the first bent portion of one moving spring can fit into the recess of the first
bent portion of the other moving spring piece, thereby the effective length of each
moving spring pieces is increased while reducing the distance between the two moving
spring pieces.
2. A magnetic latching relay capable of resisting a short-circuit current according to
claim 1, wherein each of the two moving spring pieces is provided with a second bent
portion which is convex on one side of the thickness and concave on the other side,
and the protruding directions of the two second bent portions are the same, the bending
of the second bent portion of the other moving spring piece is smaller than the bending
of the second bent portion of one moving spring piece, such that the protrusion of
the second bent portion of the other moving spring piece can fit into the recess of
the second bent portion of one moving spring piece to reduce the distance between
the two moving spring pieces and increase the effective length of each moving spring
pieces.
3. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein the first bent portion and the second bent portion are all arc
shapes.
4. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein the shape of the first bent portions and the second bent portions
of the two moving spring pieces may substantially be U-shaped, n-shaped or C-shaped,
and the center line of the opening of the U-shaped, n-type or C-shaped of the bent
portion is substantially perpendicular to a flat spring piece of the moving spring
piece.
5. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein in the two moving spring pieces, the distance from a flat spring
piece between the first bent portion and the second bent portion of one moving spring
piece to a flat spring piece between the first bent portion and the second bent portion
of the other moving spring piece is smaller than the distance between the flat spring
pieces at the contact position of the two moving spring pieces.
6. The magnetic latching relay capable of resisting a short-circuit current according
to claim 5, wherein the distance from the flat spring piece between the first bent
portion and the second bent portion of one moving spring piece to the flat spring
piece between the first bent portion and the second bent portion of the other moving
spring piece is roughly equal to the distance between the two first bent portions
and the second bent portions.
7. A magnetic latching relay capable of resisting a short-circuit current according to
claim 1, wherein in the same set of moving spring portion, the stationary contact
is connected at the junction of the other end of the moving spring piece and one end
of the moving spring lead-out piece.
8. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein in the same moving spring piece, the protruding direction of the
first bent portion is opposite to the protruding direction of the second bent portion.
9. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein in the same moving spring piece, the first bent portion and the
second bent portion are respectively located at both ends of the moving spring piece.
10. The magnetic latching relay capable of resisting a short-circuit current according
to claim 1 or 2, wherein the moving spring piece and the moving spring lead-out piece
are two separate parts.
11. The magnetic latching relay capable of resisting a short-circuit current according
to claim 1 or 2, wherein the moving spring piece and the moving spring lead-out piece
are assembled in an integrated structure.
12. The magnetic latching relay capable of resisting a short-circuit current according
to claim 1 or 2, wherein the moving spring piece is formed by a single spring piece.
13. The magnetic latching relay capable of resisting a short-circuit current according
to claim 1 or 2, wherein the moving spring piece is composed of two or more spring
pieces stacked in the thickness direction.
14. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2 or 3 or 8, wherein the lengths and shapes of the moving spring pieces of
the two sets of moving spring portions having the first bent portions and the second
bent portions are completely the same.
15. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein further comprises a base, the moving spring lead-out pieces of
the contact portion are inserted on the base, and the two moving spring lead-out pieces
are respectively located on both sides of the base, wherein one of the moving spring
lead-out pieces is a current lead-in end, and the other moving spring lead-out piece
is a current lead-out end; each end of the two moving spring lead-out pieces is respectively
fitted in the base, and the other ends of the two moving spring lead-out pieces respectively
extend outside of the base.
16. The magnetic latching relay capable of resisting a short-circuit current according
to claim 15, wherein the two moving spring lead-out pieces are respectively provided
with a positioning protrusion for matching with the base in the thickness direction,
and the base is provided with a slot for matching with the positioning protrusion
of the corresponding moving spring lead-out piece.
17. The magnetic latching relay capable of resisting a short-circuit current according
to claim 16, wherein a positioning tongue piece extends outwardly from one end of
each of the moving spring lead-out piece, the positioning tongue piece inclines at
an angle with respect to the moving spring lead-out piece to avoid the bent portion
of the moving spring piece.
18. The magnetic latching relay capable of resisting a short-circuit current according
to claim 17, wherein the thickness of the positioning tongue piece is smaller than
the thickness of the moving spring lead-out piece.
19. The magnetic latching relay capable of resisting a short-circuit current according
to claim 15, wherein the vertical distance of the extension line of the opposite sides
of the two moving spring lead-out pieces is 4.6 mm, and the tolerance range is -0.1
to +0.5 mm; in the two moving spring lead-out pieces, the size of the opposite side
of one moving spring lead-out piece closer to a parallel side wall of the base to
the outer surface of the parallel side wall is 5.1 mm, and the tolerance range is
-0.5 to +0.5mm.
20. The magnetic latching relay capable of resisting a short-circuit current according
to claim 2, wherein further comprises a rotary magnetic circuit portion and a push
block, the rotary magnetic circuit portion respectively matches with the ends of the
two moving spring pieces through the push block, such that the two moving contacts
are respectively brought into contact with the two stationary contacts when the rotary
magnetic circuit portion rotates towards to one side, and the two moving contacts
are respectively separated from the two stationary contacts when the rotary magnetic
circuit portion rotates toward to the other side.