This application is based upon and claims priority to Chinese Patent Application No. 202322845708.4, filed on October 23, 2023, the entire contents thereof are incorporated herein by reference.

The present disclosure relates to the field of relay technology, and in particular to a pressure spring and a magnetic latching relay.

The magnetic latching relay is an automatic switch that connects and disconnects the circuit. The magnetic latching relay includes a contact structure, a magnetic circuit structure and a push card. The contact structure includes a movable contact piece, a static contact piece and a pressure spring. The movable contact piece is provided with a movable contact, the static contact piece is provided with a static contact, the pressure spring is provided on the movable contact piece, and the pressure spring is connected to one end of the push card. The magnetic circuit structure has a coil and an armature. When a forward pulse voltage is applied to the coil, a positive magnetic field is generated, the armature rotates and drives the push card to move, and the push card drives the pressure spring so that the movable contact and the static contact are in contact. When the impulse voltage is applied to the coil in the opposite direction, a reverse magnetic field is generated; the armature rotates in the opposite direction and drives the push card to move. The push card drives the pressure spring to move in the opposite direction, the movable contact and the static contact are disconnected, and the load circuit is disconnected.

However, when the load circuit generates a short-circuit current; the movable contact piece and the static contact piece attract each other. Due to the large short-circuit current, the two ends of the elastic piece are prone to tilt up, which will drive the pressure spring to tilt up, and then easily drive the push card to move. The contact pressure between the movable contact and the static contact changes suddenly or even breaks, making the connecting state of the relay unstable.

The above information disclosed in this section is intended only to enhance understanding of the background of present disclosure, and hence may include information that does not constitute relevant art known to those skilled in the art.

The embodiments of present disclosure provide a pressure spring and a magnetic latching relay, which can prevent the pressure spring from tilting when a short-circuit current is generated, and maintain the stability of the relay in the connecting state.

The embodiment of the disclosure provides a pressure spring, including a fixed portion; and an elastic portion connected to the fixed portion, an angle is formed between the elastic portion and the fixed portion, and the angle is an obtuse angle; the elastic portion has at least one bending structure.

In some embodiments of the disclosure, the fixed portion includes a first fixed portion and a second fixed portion spaced apart from each other, the first fixed portion and the second fixed portion are both located at one end of the elastic portion; the elastic portion includes a first elastic portion and a second elastic portion spaced apart from each other, the first elastic portion is connected to the first fixed portion, the second elastic portion is connected to the second fixed portion, and ends of the first elastic portion and the second elastic portion away from the fixed portion are connected; wherein at least one of the first elastic portion and the second elastic portion has at least one bending structure.

In some embodiments of the disclosure, the bending structure is formed by bending the elastic portion, and a cross-sectional shape of the bending structure is at least one of a U-shape, a V-shape, a C-shape and a polygon.

In some embodiments of the disclosure, a contour line of the cross-section of the bending structure is at least one of a wavy line, a jagged line and a smooth line.

In some embodiments of the disclosure, the bending structure on the first elastic portion is a first bending structure, the bending structure on the second elastic portion is a second bending structure, and a number of the first bending structures is the same as or different from a number of the second bending structures.

In some embodiments of the disclosure, cross-sectional shapes of the first bending structure and the second bending structure are the same or different; and/or, a contour line of the cross-section of the first bending structure is the same as or different from a contour line of the cross-section of the second bending structure.

In some embodiments of the disclosure, the first bending structure and the second bending structure are both multiple in number, the shapes of the cross-sections of the multiple first bending structures are the same or different, and the contour lines of the cross-sections of the multiple first bending structures are the same or different; multiple second bending structures are the same or different, and the contour lines of the cross-sections of the multiple second bending structures are the same or different.

In some embodiments of the disclosure, a dimension of the first elastic portion in a width direction of the pressure spring is smaller than a dimension of the first fixed portion in the width direction; a dimension of the second elastic portion in the width direction of the pressure spring is smaller than a dimension of the second fixed portion in the width direction.

In some embodiments of the disclosure, the pressure spring further including a connection portion, one end of the connection portion is connected to the first elastic portion, another end of the connection portion is connected to the second elastic portion, the first elastic portion and the second elastic portion are arranged in parallel.

In some embodiments of the disclosure, the first fixed portion has a first side wall facing the second fixed portion, the second fixed portion has a second side wall facing the first fixed portion, the first side wall has a first plane portion and a protrusion protruding from the first plane portion toward the second side wall, and the second side wall has a second plane portion and a concavity concave from the second plane portion and corresponding to the protrusion; the first distance from a top of the protrusion of the first side wall to the plane where the second plane portion is located is smaller than a thickness of the pressure spring.

The embodiment of the disclosure provides a magnetic latching relay, including a movable contact piece, the movable contact piece is provided with a movable contact; a pressure spring according to present disclosure, wherein a fixed portion of the pressure spring is fixedly connected to the movable contact; and a push card, one end of the push card is connected to an elastic portion of the pressure spring.

It can be seen from the above technical solution that present disclosure has at least one of the following advantages and positive effects:
In the embodiment of the disclosure, the pressure spring includes a fixed portion and an elastic portion, and at least one bending structure is provided in the elastic portion, which can increase the effective length of the elastic portion, reduce the k (elastic coefficient) value of the elastic portion, and make the elastic portion more easily deformed. When the pressure spring is applied to the magnetic latching relay, in the case of short circuit current or large current, if both ends of the elastic piece are tilted, since the pressure spring is more easily deformed, under the action of the push card, the pressure spring does not tilt or tilts slightly, which is not enough to affect the contact pressure between the movable contact and the static contact, so that the connecting state of the relay is more stable.

The above and other features and advantages of present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

• Fig. 1 is a schematic perspective view of the pressure spring according to some embodiments of present disclosure;
• Fig. 2 is a schematic perspective view of the pressure spring according to some embodiments of present disclosure;
• Fig. 3 is a schematic perspective view of the pressure spring installed on the movable contact piece according to some embodiments of present disclosure;
• Fig. 4 is a side view of the pressure spring installed on the movable contact piece according to some embodiments of present disclosure;
• Fig. 5 is a side view of the pressure spring, according to some embodiments of present disclosure, wherein the bending structure has a U-shaped cross-section;
• Fig. 6 is a side view of the pressure spring having a V-shaped cross-section of the bending structure according to some embodiments of present disclosure,, wherein the bending structure has a U-shaped cross-section;
• Fig. 7 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has a C-shaped cross-section;
• Fig. 8 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has a rectangular cross-section;
• Fig. 9 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has two U-shaped structures;
• Fig. 10 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has two V-shaped structures;
• Fig. 11 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has two C-shaped structures;
• Fig. 12 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has a wavy or zigzag contour line;
• Fig. 13 is a side view of the pressure spring according to some embodiments of present disclosure, wherein the bending structure has a wavy or zigzag contour line;
• Fig. 14 is a schematic top view of the magnetic latching relay shown according to some embodiments of present disclosure;
• Fig. 15 is a schematic top view of the magnetic latching relay (without the injection molded part) according to some embodiments of present disclosure.

1, pressure spring; 11, fixed portion; 111, first fixed portion; 1110, first side wall; 1111, protrusion;112, second fixed portion; 1120, second side wall; 1121, concavity; 12, elastic portion; 120, bending structure; 121, first elastic portion; 1211, first bending structure; 122, second elastic portion; 1221, second bending structure; 13, connection portion; 2, base; 3, movable contact piece; 31, movable contact; 4, static contact piece; 41, static contact; 5, coil module; 51, bobbin; 52, coil; 6, yoke assembly; 61, first yoke; 62, second yoke; 7, permanent magnet; 8, armature; 9, injection molded part; 91, swing arm; 10, push card;α, angle; X, width direction;d, first distance; T, thickness of pressure spring.

Exemplary embodiments will be described more comprehensively with reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to implementations described herein. Rather, these embodiments are provided to make the present disclosure comprehensive and complete, and fully convey the idea of exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote same or similar structures, and thus their detailed description will be omitted.

As shown in Fig. 1 and Fig. 2, the embodiment of the disclosure provides a pressure spring 1. The pressure spring 1 of the embodiment of the disclosure can be applied to a magnetic latching relay.

As shown in Figs. 1 and 2, the pressure spring 1 may include a fixed portion 11 and an elastic portion 12. The elastic portion 12 is connected to the fixed portion 11, and there is an angle α between the elastic portion 12 and the fixed portion 11, the angle α is an obtuse angle, and the elastic portion 12 has at least one bending structure 120. By providing the bending structure 120 in the elastic portion 12, the effective length of the pressure spring 1 can be increased, the k value of the elastic portion 12 can be reduced, and the elastic portion 12 can be more easily deformed. In the case where the pressure spring 1 is applied to the magnetic latching relay and a short circuit current or a large current is generated, if both ends of the elastic piece are tilted, since the pressure spring 1 is more easily deformed, under the action of the push card, the pressure spring 1 does not tilt or tilts slightly, which is not enough to affect the contact pressure between the movable contact 31 and the static contact 41, so that the connecting state of the relay is more stable.

Wherein, the effective length of the pressure spring 1 can be understood as the length of the pressure spring 1 after the bending structure 120 is straightened.

As shown in Figs. 1, 2 and 14, the fixed portion 11 of the pressure spring 1 is used to be fixedly connected with other structures. For example, when the pressure spring 1 is applied to the relay, the fixed portion 11 is used to connect with one end of the movable contact 31 of the movable contact piece 3 away from the static contact 41 of the static contact piece 4, and the elastic portion 12 is used to connect with one end of the push card 10. When the magnetic circuit structure of the relay drives the push card 10 to move, the push card 10 can drive the elastic portion 12 of the pressure spring 1 to move, thereby making the movable contact 31 of the relay contact with the static contact 41, thereby achieving the connection of the relay.

In some embodiments, the fixed portion 11 and the elastic portion 12 are integrally formed, and the fixed portion 11 and the elastic portion 12 may also be connected together by welding, riveting or screwing. In some embodiments, the fixed portion 11 and the elastic portion 12 may have the same material, which has certain elasticity. The fixed portion 11 and the elastic portion 12 may also have different materials. For example, the material of the elastic portion 12 is more elastic than the material of the fixed portion 11.

In some embodiments, as shown in Figs. 4 to 5, an angle α is provided between the elastic portion 12 and the fixed portion 11, and the angle α is an obtuse angle, for example, the angle α can be 120°, 135°, 150°, or 160°, and can be set by those skilled in the art according to actual conditions, and is not particularly limited herein. As shown in Figs. 3 and 4, when the pressure spring 1 is connected to the movable contact piece 3, the fixed portion 11 is fixedly connected to the movable contact piece 3, and the elastic portion 12 is tilted compared to the fixed portion 11, so that the push card 10 can apply a force to the elastic portion 12, so that the movable contact 31 of the movable contact piece 3 is in contact with the static contact 41 of the static contact piece 4.

As shown in Figs. 1 and 2, the fixed portion 11 of the pressure spring 1 has a mounting hole, and the mounting hole is used to fix the pressure spring 1 with other structures. For example, the mounting hole is used to connect with the protrusion corresponding to the movable contact 31 on the movable contact piece 3, so that the pressure spring 1 is connected with the movable contact piece 3.

In some embodiments, as shown in Fig. 2, the fixed portion 11 includes a first fixed portion 111 and a second fixed portion 112 spaced apart from each other, the first fixed portion 111 and the second fixed portion 112 are located at one end of the elastic portion 12. The elastic portion 12 includes a first elastic portion 121 and a second elastic portion 122 spaced apart from each other, the first elastic portion 121 is connected to the first fixed portion 111, the second elastic portion 122 is connected to the second fixed portion 112, and ends of the first elastic portion 121 and the second elastic portion 122 away from the fixed portion 11 are connected with each other. At least one of the first elastic portion 121 and the second elastic portion 122 has at least one bending structure 120.

As shown in Fig. 2, in some embodiments, the pressure spring 1 has an opening, which extends from one end of the fixed portion 11 to the elastic portion 12 but does not penetrate the elastic portion 12, and divides the fixed portion 11 into a first fixed portion 111 and a second fixed portion 112, and divides a portion of the elastic portion 12 close to the fixed portion 11 into a first elastic portion 121 and a second elastic portion 122, and the first fixed portion 111 and the second fixed portion 112 are located on the same side of the first elastic portion 121 and the second elastic portion 122, respectively.

As shown in Fig. 2, the first elastic portion 121 and the second elastic portion 122 may each have one or more bending structures 120, or the first elastic portion 121 may have one or more bending structures 120 and the second elastic portion 122 may not have the bending structure 120, or the second elastic portion 122 may have one or more bending structures 120 and the first elastic portion 121 may not have the bending structure 120. When the first elastic portion 121 and/or the second elastic portion 122 have a plurality of bending structures 120, the number of the bending structures 120 may be 2, 3, 4 or more, and may be set according to the size of the bending structure 120 and the size of the elastic portion 12, and is not particularly limited here.

In some embodiments, the bending structure 120 is formed by bending the elastic portion 12, and the cross-sectional shape of the bending structure 120 is at least one of a U-shape, a V-shape, a C-shape and a polygon.

The bending structure 120 is formed by bending the elastic portion 12, so the length of the elastic portion 12 is extended, so that the effective length of the elastic portion 12 can be extended without changing the overall length of the elastic portion 12, thereby reducing the k value of the elastic portion 12. The overall length of the elastic portion 12 can be understood as the distance from one end to the other end of the elastic portion 12 in the length direction of the pressure spring 1.

It should be noted that, for the convenience of description, the width direction X of the pressure spring 1 is defined as the direction in which the first fixed portion 111 and the second fixed portion 112 are parallel, and the length direction of the pressure spring 1 is defined as the direction perpendicular to the width direction X. The length direction is not necessarily only one direction. For example, there is an angle α between the length direction of the fixed portion 11 and the length direction of the elastic portion 12. This technical term is only for the convenience of description and has no limiting meaning.

In some embodiments, as shown in Fig. 5, the cross-section of the bending structure 120 is U-shaped, and Fig. 5 shows an inverted U-shape. As shown in Fig. 6, the cross-section of the bending structure 120 is V-shaped, and Fig. 6 shows an inverted V-shape. As shown in Fig. 7, the cross-section of the bending structure 120 is C-shaped. As shown in Fig. 8, the cross-section of the bending structure 120 is rectangular. Of course, the cross-section of the bending structure 120 may also be square, trapezoidal, pentagonal, hexagonal, octagonal, etc., which is not particularly limited here.

As shown in Fig. 9, the elastic portion 12 has two U-shaped bending structures 120. As shown in Fig. 10, the elastic portion 12 has two V-shaped bending structures 120. As shown in Fig. 11, the elastic portion 12 has two C-shaped bending structures 120. As shown in Fig. 12, the elastic portion 12 has two rectangular bending structures 120. Of course, the number of the bending structures 120 may be 2, 3, 4 or more, and may be set according to the size of the bending structure 120, the size of the elastic portion 12 and the requirements for the k value of the elastic portion 12, and no special limitation is made here.

It should be noted that the cross-section of the bending structure 120 can be understood as a cross-section parallel to the side of the bending structure 120.

In some embodiments, the cross-section of the bending structure 120 has a profile that is at least one of a wavy line, a jagged line, and a smooth line.

As shown in Fig. 13, the elastic portion 12 has two bending structures 120, one of which has a wavy cross-sectional contour line, and the other has a zigzag cross-sectional contour line. By setting the cross-sectional contour line of the bending structure 120 to a wavy line or a zigzag line, the effective length of the elastic portion 12 can be further increased without changing the overall length of the pressure spring 1, and the k value of the elastic portion 12 can be further reduced. Considering the difficulty of the processing technology, it is preferred to set a plurality of bending structures 120. When the elastic requirements of the elastic portion 12 are still not met after setting the maximum number of bending structures 120 on the elastic portion 12, a plurality of wavy bends or zigzag bends can be set on the bending structure 120, that is, the cross-sectional contour line of the bending structure 120 can be set to a wavy line or a zigzag line.

As shown in Figs. 5 to 12, the contour lines of the cross-section of the bending structure 120 are all smooth lines. It should be noted that the smooth line refers to a straight line or a smooth arc.

In some embodiments, as shown in Fig. 2, the bending structure 120 on the first elastic portion 121 is the first bending structure 1211, the bending structure 120 on the second elastic portion 122 is the second bending structure 1221, and the number of the first bending structure 1211 is the same as or different from the number of the second bending structure 1221.

In some embodiments, the first bending structure 1211 and the second bending structure 1221 are aligned or not aligned in the width direction X of the pressure spring 1. Alignment can be understood as the center lines of the first bending structure 1211 and the second bending structure 1221 extending along the width direction X coincide with each other.

In some embodiments, the sizes of the openings of the first bending structure 1211 and the second bending structure 1221 may be the same or different. The heights of the first bending structure 1211 and the second bending structure 1221 may be the same or different, and those skilled in the art may set them according to actual needs, and are not particularly limited here.

In some embodiments, the cross-sections of the first bending structure 1211 and the second bending structure 1221 are the same or different in shape. For example, the cross-sections of the first bending structure 1211 and the second bending structure 1221 are both U-shaped, or both V-shaped, or both C-shaped, or both polygonal. For another example, the cross-section of the first bending structure 1211 is U-shaped, and the cross-section of the second bending structure 1221 is V-shaped; the cross-section of the first bending structure 1211 is V-shaped, and the cross-section of the second bending structure 1221 is polygonal. Those skilled in the art can set the cross-sections according to actual needs, and the examples are not repeated here.

In some embodiments, the contour line of the cross-section of the first bending structure 1211 is the same as or different from the contour line of the cross-section of the second bending structure 1221.

For example, the contour lines of the cross-section of the first bending structure 1211 and the contour lines of the cross-section of the second bending structure 1221 are both serrated lines, or both are wavy lines, or both are smooth lines. For another example, as shown in Fig. 13, the contour line of the cross-section of the first bending structure 1211 is a wavy line, and the contour line of the cross-section of the second bending structure 1221 is a serrated line, or the contour line of the cross-section of the first bending structure 1211 is a wavy line, and the contour line of the cross-section of the second bending structure 1221 is a smooth line.

In some embodiments, the first bending structure 1211 and the second bending structure 1221 are both provided in plurality, and the shapes of the cross-sections of the plurality of first bending structures 1211 are the same or different, and the contour lines of the cross-sections of the plurality of first bending structures 1211 are the same or different; the shapes of the cross-sections of the plurality of second bending structures 1221 are the same or different, and the contour lines of the cross-sections of the plurality of second bending structures 1221 are the same or different.

For example, the cross-section of the first bending structure 1211 is U-shaped. Alternatively, the cross-section of part of the first bending structure 1211 is U-shaped, and the cross-section of the other part of the first bending structure 1211 is V-shaped or C-shaped. The cross-section of the second bending structure 1221 is similar and will not be described in detail here.

In some embodiments, as shown in Fig. 2, the dimension of the first elastic portion 121 in the width direction X of the pressure spring 1 is smaller than the dimension of the first fixed portion 111 in the width direction X;the dimension of the second elastic portion 122 in the width direction X of the pressure spring 1 is smaller than the dimension of the second fixed portion 112 in the width direction X.

That is, the elastic portion 12 is narrower than the fixed portion 11, and reducing the width of the elastic portion 12 can increase the aspect ratio of the elastic portion 12 and reduce the k value of the elastic portion 12, making the elastic portion 12 more susceptible to deformation.

It should be noted that the embodiment of present disclosure does not reduce the k value of the elastic portion 12 as small as possible, but reduces it to a suitable value. When the pressure spring 1 is applied to the relay, the push card 10 can apply contact pressure to the movable contact 31 and the static contact 41 through the pressure spring 1 to prevent the movable contact 31 and the static contact 41 from being disconnected. Moreover, when the load circuit is short-circuited flowing through the movable contact piece 3; the pressure spring 1 is more easily deformed during the process of tilting. Under the force of the push card 10, the pressure spring 1 will deform in the opposite direction of the tilting direction, ensuring that the push card 10 does not move, thereby ensuring the contact pressure between the movable contact 31 and the static contact 41, avoiding a sudden change in the contact pressure between the two or even disconnection between the two, and ensuring the stability of the connecting state of the relay.

In some embodiments, as shown in Fig. 2, the pressure spring 1 further includes a connection portion 13, one end of the connection portion 13 is connected to the first elastic portion 121, the other end of the connection portion 13 is connected to the second elastic portion 122, and the first elastic portion 121 and the second elastic portion 122 are arranged in parallel.

As shown in Fig. 2, the connection portion 13 may be formed integrally with the elastic portion 12, or may be a separate connection portion. In some embodiments, the dimension of the connection portion 13 along the length direction of the pressure spring 1 is smaller than its dimension along the width direction X, that is, the dimension of the connection portion 13 along the length direction of the pressure spring 1 is smaller than the distance between the first elastic portion 121 and the second elastic portion 122, so that the width dimensions of the first elastic portion 121 and the second elastic portion 122 are reduced as much as possible, so as to further reduce the k value of the elastic portion 12.

As shown in Fig. 2, in some embodiments, the first fixed portion 111 has a first side wall 1110 facing the second fixed portion 112, the second fixed portion 112 has a second side wall 1120 facing the first fixed portion 111, the first side wall 1110 has a first plane portion and a protrusion 1111 protruding from the first plane portion toward the second side wall 1120, the second side wall 1120 has a second plane portion and a concavity 1121 concave from the second plane portion and corresponding to the protrusion;The first distance d from the top of the protrusion 1111 of the first side wall 1110 to the plane where the second plane portion is located is less than the thickness T of the pressure spring 1, so that other pressure springs 1 can be prevented from being inserted between the first fixed portion 111 and the second fixed portion 112 during transportation, thereby preventing the pressure spring 1 from being deformed. There is no need to disassemble before assembly, which improves production efficiency.

As mentioned above, the pressure spring 1 in the embodiment of the disclosure includes the fixed portion 11 and the elastic portion 12, and at least one bending structure 120 is provided in the elastic portion 12, which can increase the effective length of the elastic portion 12, reduce the k value of the elastic portion 12, and make the elastic portion 12 more easily deformed. When the pressure spring 1 is applied to the magnetic latching relay, when a short circuit current or a large current is generated, if both ends of the movable contact piece 3 are tilted, since the pressure spring 1 is more easily deformed, under the action of the push card 10, the pressure spring 1 does not tilt or tilts slightly, which is not enough to affect the contact pressure between the movable contact 31 and the static contact 41, so that the connecting state of the relay is more stable. In addition, since the pressure spring 1 is more easily deformed, it is easier to assemble, ensuring the consistency of assembly parameters.

As shown in Figs. 14 and 15, the embodiment of the disclosure further provides a magnetic latching relay. The magnetic latching relay includes a base 2, a contact structure, a magnetic circuit structure and a push card 10. The contact structure, the magnetic circuit structure and the push card 10 are all mounted on the base 2. The contact structure includes a movable contact piece 3, a static contact piece 4 and the pressure spring 1 in any of the above embodiments. The movable contact piece 3 is provided with a movable contact 31 at its end, the static contact 41 is provided at its end corresponding to the position of the movable contact 31, and the fixed portion 11 of the pressure spring 1 is connected to a side of the movable contact 31 away from the static contact 41.

The magnetic circuit structure includes a coil module 5, a yoke assembly 6, a permanent magnet 7 and an armature 8. The coil module 5 includes a bobbin 51, a coil 52 wound around the bobbin 51 and an iron core (not shown in the drawings), and the iron core is placed in the bobbin 51. The yoke assembly 6 includes a first yoke 61 and a second yoke 62. The first yoke 61 and the second yoke 62 are located on both sides of the bobbin 51 in the axial direction, and the first yoke 61 and the second yoke 62 are fixed on the base 2. The permanent magnet 7 and the armature 8 are fixed together by an injection molding process, that is, the permanent magnet 7 and the armature 8 are fixedly connected by the injection molded part 9. The permanent magnet 7 is arranged on a rotating shaft, and can rotate around the rotating shaft. There are two armatures 8, which are respectively located on the upper and lower sides of the permanent magnet 7, and the two ends of each armature 8 extend out of the left and right sides of the permanent magnet 7. When the permanent magnet 7 rotates, it can drive the armature 8 to move, so that the two ends of the extended armature 8 contact the first yoke 61 and the second yoke 62. The injection molded part 9 also includes a swing arm 91, and one end of the swing arm 91 extends into a groove of the push card 10. When the permanent magnet 7 swings, it can drive the swing arm 91 to swing, and the swing arm 91 drives the push card 10 to move. One end of the push card 10 is connected to the elastic portion 12 of the pressure spring 1.

When forward pulse voltage is applied to the coil 52, the iron core, the yoke assembly 6, the armature 8 and the permanent magnet 7 form a magnetic field, and the permanent magnet 7 rotates around the rotating shaft and is maintained at the first rotation position. The armature 8 rotates accordingly, and as the permanent magnet 7 is maintained at the first rotation position, it contacts the first yoke 61 and the second yoke 62 located on both sides of the permanent magnet 7. The swing arm 91 also swings as the permanent magnet 7 rotates, and the swing arm 91 drives the push card 10 to move, and the push card 10 drives the pressure spring 1 to move, thereby making the movable contact 31 contact the static contact 41. When the forward pulse voltage is removed, since the magnetism of the permanent magnet 7 still exists, the permanent magnet 7 is maintained at the first rotation position, so that the movable contact 31 and the static contact 41 can be maintained in contact.

If the load circuit is short-circuited at this time, a short-circuit current is generated, or if the current of the load circuit is large, the short-circuit current or the large current flows through the movable contact piece 3 and the static contact piece 4, and the movable contact piece 3 and the static contact piece 4 attract each other. Due to the large current, the two ends of the movable contact piece 3 and the static contact piece 4 are tilted away from each other, and the pressure spring 1 located on the movable contact piece 3 is also tilted. As shown in Fig. 14, the tilting of the pressure spring 1 will exert a force in the tilting direction on the push card 10. If the pressure spring 1 is relatively rigid and the force is large enough, it may drive the push card 10 to move in the tilting direction, that is, the force exerted by the pressure spring 1 on the push card 10 is greater than the force exerted by the swing arm 91 on the push card 10. The movement of the push card 10 causes a sudden change in the contact force between the movable contact 31 and the static contact 41, such as a sudden decrease in the contact pressure or a sudden disconnection of the two, and may cause the armature 8 and the yoke are not stably engaged, which makes the relay working state unstable.

However the elastic portion 12 of the pressure spring 1 in the embodiment of present disclosure increases its effective length by providing the bending structure 120, the k value is reduced, that is, the elastic portion 12 is more easily deformed, so when the pressure spring 1 is tilted, under the force of the push card 10, the elastic portion 12 of the pressure spring 1 will deform in the opposite direction of the tilting direction, and will not drive the push card 10 to move, so that the pressure between the contacts changes smoothly, and the range of the contact pressure is increased, thereby avoiding the sudden change of the contact pressure between the movable contact 31 and the static contact 41 or the sudden disconnection of the two, and ensuring the stability of the armature 8 and the yoke suction, and ensuring the stability of the working state of the relay.

When the reverse pulse voltage is applied to the coil 52, the iron core, the yoke assembly 6, the armature 8 and the permanent magnet 7 form a magnetic field opposite to the magnetic field formed by the forward pulse voltage, and the permanent magnet 7 rotates in the opposite direction around the rotating shaft and is maintained at the second rotation position. The armature 8 rotates accordingly and is maintained at the second rotation position along with the permanent magnet 7, and contacts the first yoke 61 and the second yoke 62 located on both sides of the permanent magnet 7. The swing arm 91 also swings along with the rotation of the permanent magnet 7, and the swing arm 91 drives the push card 10 to move, and the push card 10 drives the pressure spring 1 to move, thereby disconnecting the movable contact 31 from the static contact 41. When the reverse pulse voltage is removed, the permanent magnet 7 is maintained at the second rotation position because the magnetism of the permanent magnet 7 still exists, so that the movable contact 31 and the static contact 41 can be maintained disconnected until the forward pulse voltage is applied again. So that the movable contact 31 and the static contact 41 contact again.

In summary, the connecting state of the relay of the embodiment of the disclosure can be more stable and will not be disconnected suddenly.

It can be understood that various embodiments/implementations provided by the present disclosure may be combined with each other without causing conflicts, and will not be elaborated in detail.

In embodiments of the present disclosure, terms such as "first," "second," and "third" are used only for purposes of description and are not intended to indicate or imply relative importance; the term "a plurality of" means two or more than two, unless specified otherwise. Terms such as "mounted," "connected," "coupled," "fixed" and the like should be understood broadly, and may be, for example, fixed connection, detachable connection, or integral connection; may also be direct connection or indirect connection via intervening structures. For those skilled in the art, specific meanings of the above terms in embodiments of the present disclosure may be understood according to specific situations. In the description of embodiments of the present disclosure, terms such as "upper," "lower," "left," "right," "front" and "rear" should be construed to refer to the orientations or positions as then described or as shown in the drawings under discussion, and are only used for convenience and simplicity of the description of embodiments of the present disclosure, but do not indicate or imply that the device or unit referred to must have a particular orientation or be constructed and operated in a particular orientation. Thus, these terms shall not be construed as limitation on the embodiments of the present disclosure.

Reference throughout this specification to "an embodiment," "some embodiments," "a specific embodiment" and the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. Thus, the appearances of the phrases throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

The above description only involves preferred embodiments of the present disclosure and is not intended to limit embodiments of the present disclosure. For those skilled in the art, embodiments of the present disclosure may have various modifications and variations. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of embodiments of the present disclosure shall be included in the protection scope of embodiments of the present disclosure.