MAGNETIC LATCHING RELAY

Abstract

 The present disclosure provides a magnetic latching relay, comprising a base, contact structures, first static reed lead-out members, a coil assembly, and a magnetic circuit structure. The contact structures are arranged on the base; the contact structures each have a first end and a second end in a transverse direction; the first static reed lead-out members each comprise a first lead-out part and a second lead-out part; the first lead-out part is connected to the first end of the corresponding contact structure; the second lead-out part is connected to the first lead-out part and extends out of the base in a vertical direction from the bottom of the base; a guide groove is formed in the first lead-out part; the guide groove extends transversely from the side of the first lead-out part close to the second end and does not run through the first lead-out part; an opening of the guide groove faces the second end; and the coil assembly and the magnetic circuit structure are arranged on the base and located on one side of the contact structure in a longitudinal direction. The magnetic latching relay of the present disclosure has higher stability.

Description

CROSS REFERENCE

[0001] This application is based upon and claims priority to Chinese Patent Application No. 202311378837.5, filed on October 23, 2023, the entire contents thereof are incorporated herein by reference.

TECHNICAL FIELD

[0002] The present disclosure relates to the field of relay technology, and more particularly to a magnetic latching relay.

BACKGROUND

[0003] A magnetic latching relay is an electronic switch that switches the load circuit on and off. When an impulse voltage is applied to a coil of the magnetic latching relay, a magnetic circuit structure of the magnetic latching relay will generate a constant magnetic field. Due to the constant magnetic field, the magnetic latching relay is kept in a connect or disconnect state. The magnetic latching relay includes a lead-out terminal for electrical connection with an external load. The lead-out terminal usually extends in a direction perpendicular to the base. When the magnetic latching relay is connected to a load current, since the load current is an alternating current, the lead-out terminal will generate an alternating magnetic field. The alternating magnetic field is at least partially coplanar with the constant magnetic field generated by the magnetic circuit structure.

[0004] However, since some of the lead-out terminals are close to the magnetic circuit structure, when the magnetic flux line of the alternating magnetic field is in opposite directions to the magnetic flux line of the constant magnetic field, the constant magnetic field will be weakened, and when the directions are the same, the stability of the constant magnetic field will be disturbed, especially in a high current environment, which may cause the magnetic latching relay to disconnect and make the magnetic latching relay unstable when in use.

[0005] The above information disclosed in this section is intended only to enhance understanding of the background of the present disclosure, and hence may include information that does not constitute relevant art known to those skilled in the art.

SUMMARY

[0006] The embodiment of the disclosure provides a magnetic latching relay, which can avoid the influence of the alternating magnetic field and improve the stability of the magnetic latching relay.

[0007] The embodiment of the disclosure provides a magnetic latching relay, including a base; a contact structure, located on the base, the contact structure has a first end and a second end in the transverse direction; a first static lead-out piece including a first lead-out part and a second lead-out part, the first lead-out part is connected to the first end of the contact structure, the second lead-out part is connected to the first lead-out part, and extends out from a bottom of the base along a vertical direction of the base; the first lead-out part has a guiding groove, the guiding groove extends from one side of the first lead-out part close to the second end along a transverse direction and does not penetrate the first lead-out part, and an opening of the guiding groove faces the second end of the contact structure; and a coil module and a magnetic circuit structure, disposed on the base and located on one side of the contact structure in a longitudinal direction.

[0008] In some embodiments of the present disclosure, the first end of the contact structure is provided with a first contact set comprising a first movable contact and a first static contact, and the second end is provided with a second contact set comprising a second movable contact and a second static contact; the guiding groove is located at a side of the first static contact in a vertical direction.

[0009] In some embodiments of the present disclosure, the contact structure comprises a first elastic piece extending along the transverse direction, the first elastic piece comprises two first static contacts at the first end and two second movable contacts at the second end, the first elastic piece comprises a slit, the slit extends from the second end of the first elastic piece along the transverse direction to between the two first static contacts; the guiding groove of the first static lead-out piece is located between the two first static contacts.

[0010] In some embodiments of the present disclosure, the magnetic latching relay further comprises a second static lead-out piece,one end of the second static lead-out piece is connected to the second end of the contact structure and another end extends along the transverse direction away from the first end and extends out from a side wall of the base.

[0011] In some embodiments of the present disclosure, the magnetic latching relay further comprises a lead-out terminal located outside the base, the lead-out terminal extends along the vertical direction, and one end of the lead-out terminal is connected to one end of the second static lead-out piece located outside the base; wherein a distance from the lead-out terminal to the second end is greater than a distance from the first static lead-out piece to the first end.

[0012] In some embodiments of the present disclosure, a depth dimension of the guiding groove along the transverse direction is 1/3 to 1/2 of a dimension of the first lead-out part along the transverse direction.

[0013] In some embodiments of the present disclosure, an impulse voltage is applied to the coil module, the magnetic circuit structure and the coil module can form a constant magnetic field, and a first centerline of the constant magnetic field in the longitudinal direction deviates from a second centerline between the first contact set and the second contact set and is closer to the second contact set.

[0014] In some embodiments of the present disclosure, the coil module comprises: a bobbin, located on the base; a coil, wound around the bobbin; and an iron core, located in the bobbin; wherein the first centerline passes through the center of the bobbin.

[0015] In some embodiments of the present disclosure, the magnetic circuit structure comprises a permanent magnet swingably disposed on the base; an armature disposed on the permanent magnet, and the armature protrudes from the permanent magnet in the transverse direction; and a first yoke and a second yoke both fixed on the base and located on opposite sides of the coil module, one end of the first yoke is connected to one end of the iron core, and another end of the first yoke can be in contact with and connected to one end of the armature; one end of the second yoke is connected to another end of the iron core, and another end of the second yoke can be in contact with and connected to another end of the armature; when the impulse voltage is applied to the coil, the permanent magnet swings to one side, and the constant magnetic field is generated at the permanent magnet, the armature, the first yoke, the iron core and the second yoke, and the first centerline of the constant magnetic field passes through a center of the permanent magnet.

[0016] In some embodiments of the present disclosure, a distance between the first centerline and the second centerline is 6 to 9 mm.

[0017] In some embodiments of the present disclosure, the magnetic latching relay further comprises a current transformer, a portion of the second static lead-out piece extending from the base is inserted into the current transformer, so that the current transformer is located between the lead-out terminal and the second end of the contact structure.

[0018] In some embodiments of the present disclosure, the base has a first side wall and a second side wall opposite to each other in the transverse direction, the first side wall being close to the first end of the contact structure, and the second side wall is close to the second end of the contact structure; wherein a portion of the first side wall that does not correspond to the contact structure in the transverse direction is concaved inward, and a portion of the second side wall that does not correspond to the contact structure in the transverse direction is convex outward.

[0019] In some embodiments of the present disclosure, the magnetic latching relay further comprises a first push card located in the base and close to the first side wall, one end of the first push card is connected to the first movable contact of the contact structure; and a second push card located in the base and close to the second side wall, one end of the second push card is connected to the second movable contact of the contact structure, and the second push card is convex toward the second side wall.

[0020] It can be seen from the above technical solution that the present disclosure has at least one of the following advantages and positive effects:
In the embodiment of the disclosure, when the alternating current of the load is applied, the alternating magnetic field generated by first lead-out part of the first static lead-out piece may affect the constant magnetic field generated by the magnetic circuit structure and coil module. In the embodiment of the disclosure, by setting the guiding groove at the first lead-out part of the first static lead-out piece, the guiding groove extends from one side of the first lead-out part close to the second end of the contact structure along the transverse direction and does not penetrate the first lead-out part, when load current flows through the first lead-out part of the first static lead-out piece, due to the guiding groove, the load current flows to the second lead-out part in the vertical direction from the part of the first lead-out part far away from the second end of the contact structure, so that the load current is far away from the magnetic circuit structure, thereby avoiding the influence of the alternating magnetic field generated at the first static spring lead-out on the constant magnetic field of the magnetic circuit structure, and improving the stability of the magnetic latching relay.

BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other features and advantages of the present disclosure will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

Fig. 1 is a schematic top view of the magnetic latching relay according to some embodiments of the present disclosure.

Fig. 2 is a schematic perspective view of the magnetic latching relay according to some embodiments of the present disclosure.

Fig. 3 is a schematic perspective view of the magnetic latching relay (without the base and the push card) according to some embodiments of the present disclosure.

Fig. 4 is a schematic view of the first static lead-out piece and the first elastic piece according to some embodiments of the present disclosure.

Fig. 5 is a schematic top view of the magnetic latching relay (without the injection molded part) according to some embodiments of the present disclosure.

Fig. 6 is schematic top view of the magnetic latching relay (without the base).

Fig. 7 is a schematic perspective view of the magnetic latching relay (without the base and the push card, and with the current transformer) according to some embodiments of the present disclosure.

[0022] Description of reference numerals:
1, base; 11, first side wall; 12, second side wall; 2, contact structure; 21, first end; 211, first movable contact; 212, first static contact; 22, second end; 221, second movable contact; 222, second static contact; 201, first elastic piece; 202, second elastic piece; 203, slit; 3, first static lead-out piece; 31, first lead-out part; 32, second lead-out part; 33, guiding groove; 4, second static lead-out piece; 5, lead-out terminal; 6, coil module; 61, bobbin; 62, coil; 63, iron core; 7, magnetic circuit structure; 71, permanent magnet; 72, armature; 73, injection molded part; 731, rotating shaft; 732, first swing arm; 733, second swing arm; 74, first yoke; 75, second yoke; 8, current transformer;91, first push card; 92, second push card; 10, fixed frame; X, transverse direction; Y, longitudinal direction; Z, vertical direction; L1, first centerline; L2, second centerline; S1, constant magnetic field; S2, first alternating magnetic field; S3, second alternating magnetic field.

DETAILED DESCRIPTION

[0023] 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.

[0024] As shown in Figs. 1 and 2, the magnetic latching relay in this embodiment of the disclosure includes a base 1, a contact structure 2, a first static lead-out piece 3, a coil module 6 and a magnetic circuit structure 7.

[0025] As shown in Fig. 1, the contact structure 2 is disposed on the base 1. The contact structure 2 has a first end 21 and a second end 22 in the transverse direction X. The first end 21 is provided with a first contact set including a first movable contact 211 and a first static contact 212, and the second end 22 is provided with a second contact set including a second movable contact 221 and a second static contact 222.

[0026] In some embodiments, as shown in Fig. 1, the contact structure 2 includes a first elastic piece 201 extending along the transverse direction X, the first end 21 of the first elastic piece 201 includes two first static contacts 212, the second end 22 of the first elastic piece 201 includes two second movable contacts 221, and the contact structure 2 further includes a second elastic piece 202 parallel to the first elastic piece 201, the first end 21 of the second elastic piece 202 includes two first movable contacts 211 corresponding to the two first static contacts 212, and the second end 22 of the second elastic piece 202 includes two second static contacts 222 corresponding to the two second movable contacts 221. When the magnetic latching relay is connected, the first movable contact 211 is in contact with the first static contact 212, the second movable contact 221 is in contact with the second static contact 222, and both the first elastic piece 201 and the second elastic piece 202 are energized.

[0027] In some embodiments, the first end 21 of the first elastic piece 201 may also have a first static contact 212, the second end 22 of the first elastic piece 201 may have a second static contact 222, and the first end 21 of the second elastic piece 202 may have a first movable contact 211, and the second end 22 of the second elastic piece 202 may have a second movable contact 221.

[0028] As shown in Figs. 2 and 3, the first static lead-out piece 3 includes a first lead-out part 31 and a second lead-out part 32, the first lead-out part 31 and the second lead-out part 32 are connected with each other. The first lead-out part 31 is connected to the first end 21 of the contact structure 2, and the second lead-out part 32 extends from the bottom of the base 1 along the vertical direction Z to the base 1. As shown in Fig. 4, the first lead-out part 31 has a guiding groove 33, the guiding groove 33 extends from one side of the first lead-out part 31 close to the second end 22 along the transverse direction X and does not penetrate the first lead-out part 31, and the opening of the guiding groove 33 faces the second end 22 of the contact structure 2.

[0029] In some embodiments, the guiding groove 33 is located on one side of the first static contact 212 in the vertical direction Z. That is, the guiding groove 33 extends from the side of the first lead-out part 31 close to the second end 22 of the contact structure 2 to at least one side of the first static contact 212 in the vertical direction Z. In this way, the load current flowing from the first contact set into the first static lead-out piece 3 can flow in a portion of the first lead-out part 31 away from the second contact set, and thus the load current can flow away from the magnetic circuit structure 7 and the coil module 6, avoiding the influence of the alternating magnetic field generated when the load current flows vertically at the first static lead-out piece 3 on the constant magnetic field generated by the magnetic circuit structure 7. In some embodiments, the depth dimension of the guiding groove 33 along the transverse direction X is 1/3 to 1/2 of the dimension of the first lead-out part 31 along the transverse direction X, so as to ensure that a rated current carrying is less than or equal to 200 A. That is, under the condition of ensuring that the rated current carrying meets the above conditions, the depth dimension of the guiding groove 33 is as large as possible, so that the load current can be kept away from the constant magnetic field as much as possible when flowing in the first static lead-out piece 3, and the influence of the alternating magnetic field generated by the load current on the constant magnetic field generated by the magnetic circuit structure 7 can be avoided.

[0030] In some embodiments, as shown in Figs. 3 and 4, the first lead-out part 31 of the first static lead-out piece 3 is connected to the first static contact 212, and the second lead-out part 32 extends from the bottom of the base 1 along the vertical direction Z to the base 1. Specifically, the first lead-out part 31 may be connected to a side of the first elastic piece 201 away from the second elastic piece 202, that is, connected to an end of the first static contact 212 away from the first movable contact 211. In the embodiment of the disclosure, two contact structures 2 may be provided, and thus two first static lead-out pieces 3 may be provided.

[0031] As shown in Fig. 6, the number of the first static contacts 212 is two in this embodiment. The first elastic piece 201 of the contact structure 2 has a slit 203, and the slit 203 extends from the second end 22 of the first elastic piece 201 (the second end 22 is the second end 22 of the contact structure 2) along the transverse direction X to between the two first static contacts 212. The guiding groove 33 of the first static lead-out piece 3 is located between the two first static contacts 212.

[0032] Since the first elastic piece 201 has a slit 203, when the load current flows into the first elastic piece 201, the load current is divided into two paths flowing along the two sides of the slit 203. When the current flows through the first lead-out part 31 of the first static lead-out piece 3, it continues to flow along the two sides of the guiding groove 33. The current above the guiding groove 33 (on the vertical direction Z) changes to flow along the vertical direction Z after bypassing the guiding groove 33. When the load current flows from the second lead-out part 32 to the first lead-out part 31, since the guiding groove 33 of the transverse direction X is provided on the first lead-out part 31, when the load current flows along the vertical direction Z on the first lead-out part 31, the load current flows in the part of the first lead-out part 31 away from the second end 22 of the contact structure 2. Therefore, By arranging the slit 203 on the first elastic piece 201 and the guiding groove 33 on the first static lead-out piece 3, when the load current flows through the first lead-out part 31 in the vertical direction Z, the load current can bypass the guiding groove 33 and flow in the part of the first lead-out part 31 away from the second contact set (as shown by the dotted arrow in Fig. 4). As shown in Fig. 6, the first alternating magnetic field S2 formed by the load current flowing along the vertical direction Z on the first static lead-out piece 3 can be away from the magnetic circuit structure 7 and the coil 62, reducing the influence of the first alternating magnetic field S2 on the constant magnetic field S1 formed between the magnetic circuit structure 7 and the coil module 6, and making the magnetic latching relay more stable.

[0033] As shown in Figs. 1 to 3, the magnetic latching relay in this embodiment of the disclosure further includes a second static lead-out piece 4. One end of the second static lead-out piece 4 is connected to the second end 22 of the contact structure 2, and the other end in the transverse direction X and away from the first the first end 21, and extends from the side wall of the base 1. As shown in Fig. 5, one end of the second static lead-out piece 4 is connected to the side of the second elastic piece 202 away from the first elastic piece 201, that is, connected to the end of the second static contact 222 away from the second movable contact 221. The second static lead-out piece 4 extends along the transverse direction X, and the other end is a free end. In the embodiment of the disclosure, there are two contact structures 2, and thus there are two second static lead-out pieces 4.

[0034] In Figs. 2 and 3, the magnetic latching relay in this embodiment of the disclosure further includes a lead-out terminal 5. The lead-out terminal 5 is located outside the base 1 and extends along the vertical direction Z. One end of the lead-out terminal 5 is connected to one end of the second static lead-out piece 4 located outside the base 1 (i.e., the free end mentioned above), and the other end is a free end.

[0035] Continuing to refer to Fig. 3, the first static lead-out piece 3 and the second static lead-out piece 4 are respectively connected to the load circuit. Taking the case of two contact structures 2 as an example, when the contact structures 2 are closed, that is, the first contact set and the second contact set are in contact, as shown in Fig. 3, the current of the external load circuit can flow into one of the first static lead-out pieces 3 in the vertical direction Z, then flow through one of the contact structures 2, then flow through one of the second static lead-out pieces 4, and then flow into the load circuit. The current of the load circuit can flow into another second static lead-out piece 4 in the vertical direction Z, then flow through another contact structure 2, and then flow through another first static lead-out piece 3 before flowing into the load circuit (as shown by the arrows in Fig. 3).

[0036] Since the current of the load circuit is alternating current, an alternating voltage is generated when the current flows through the magnetic latching relay. For example, the first static lead-out piece 3 extends along the vertical direction Z, and the magnetic flux line of the first alternating magnetic field S2 may be generated by the load current flowing along the vertical direction Z on the first lead-out part 31 and the second lead-out part 32, which is shown as the dotted circle in Fig. 6. The lead-out terminal 5 extends along the vertical direction Z, and the magnetic flux line of the second alternating magnetic field S3 may be generated, which is shown as the dotted circle in Fig. 6. In the embodiment of the disclosure, the distance from the lead-out terminal 5 to the second static contact 222 is greater than the distance from the first static lead-out piece 3 to the second movable contact 212. That is, the lead-out terminal 5 is closer to the contact structure 2.

[0037] As shown in Fig. 5, in the embodiment of the disclosure, the coil module 6 is disposed on the base 1 and is located between two contact structures 2. The magnetic circuit structure 7 is located between the coil module 6 and one of the contact structures 2. As shown in Fig. 6, when an impulse voltage is applied to the coil module 6, the magnetic circuit structure 7 and the coil module 6 can form a constant magnetic field S1, and the first centerline L1 of the constant magnetic field S1 in the longitudinal direction Y deviates from the second centerline L2 between the first contact set and the second contact set and is closer to the second contact set.

[0038] As shown in Fig. 6, the first centerline L1 is a straight line passing through the middle of the constant magnetic field S1 in the longitudinal direction Y, and the second centerline L2 is a straight line passing through the middle of the first contact set and the second contact set in the longitudinal direction Y.

[0039] As shown in Fig. 6, since the magnetic circuit structure 7, the coil module 6 and the first lead-out part 31 of the first static lead-out piece 3 are all located in the base 1, the magnetic flux line of the constant magnetic field S1 formed by the magnetic circuit structure 7, the coil module 6 and the magnetic flux line of the first alternating magnetic field S2 generated at the first static lead-out piece 3 are at least partially coplanar. If the two magnetic fields partially overlap, when the direction of the magnetic flux line of the first alternating magnetic field S2 is opposite to the direction of the magnetic flux line of the constant magnetic field S1, the constant magnetic field S1 will be weakened, which may cause the magnetic latching relay to be disconnected. If the direction of the magnetic flux line of the first alternating magnetic field S2 is the same as the direction of the magnetic flux line of the constant magnetic field S1, the first alternating magnetic field S2 may affect the stability of the constant magnetic field S1 and the stability of the operation of the magnetic latching relay. However, in this embodiment, the first centerline L1 of the constant magnetic field S1 deviates from the second centerline L2 between the first contact set and the second contact set and is closer to the second contact set, so that the constant magnetic field S1 is far away from the first alternating magnetic field S2 of the first static lead-out piece 3, avoiding the overlap of the two magnetic fields and further improving the stability of the magnetic latching relay.

[0040] In addition, since the second static lead-out piece 4 extends out of the side wall of the base 1, the lead-out terminal 5 is located outside the base 1, so the second alternating magnetic field S3 generated at the lead-out terminal 5 is far away from the constant magnetic field S1. At the same time, since the base 1 has a shielding effect, the second alternating magnetic field S3 will not affect the constant magnetic field S1 generated by the magnetic circuit structure 7.

[0041] In some embodiments, as shown in Figs. 3 and 5, the coil module 6 includes a bobbin 61, a coil 62 and an iron core 63. The bobbin 61 is disposed on the base 1, the coil 62 is wound around the bobbin 61, and the iron core 63 is located in the bobbin 61. The first centerline L1 passes through the center of the bobbin 61.

[0042] That is, the first centerline L1 coincides with the centerline of the bobbin 61, and the bobbin 61 is offset relative to the contact structure 2.

[0043] In some embodiments, as shown in Fig. 1 and Fig. 5, the magnetic circuit structure 7 includes a permanent magnet 71, an armature 72, a first yoke 74 and a second yoke 75.

[0044] As shown in Fig. 5, the permanent magnet 71 is swingably disposed on the base 1, the armature 72 is disposed on the permanent magnet 71, and the armature 72 protrudes from the permanent magnet 71 in the transverse direction X. The armature 72 may be provided with two, disposed on both sides of the permanent magnet 71 in the longitudinal direction Y, and each armature 72 protrudes from the permanent magnet 71 in the transverse direction X.

[0045] As shown in Fig. 1, the magnetic circuit structure 7 also includes an injection molded part 73. The injection molded part 73 is coated on the permanent magnet 71 and part of the armature 72, so that the permanent magnet 71 and the armature 72 are fixedly connected, and the part of the armature 72 protruding from the permanent magnet 71 is not coated by the injection molded part 73. That is, the permanent magnet 71 and the armature 72 can be fixed together by using the injection molding process.

[0046] As shown in Fig. 1, the injection molded part 73 has a rotating shaft 731, one end of the rotating shaft 731 is connected to the shaft hole of the base 1, so that the injection molded part 73, the armature 72 and the permanent magnet 71 can swing around the rotating shaft 731. The other end of the rotating shaft 731 can be connected to the shaft hole of the fixed frame 10 (as shown in Fig. 7). The injection molded part 73 can swing around the rotating shaft 731 on the base 1 through the rotating shaft 731. The fixed frame 10 is used to limit the permanent magnet 71, the armature 72 and the injection molded part 73 so that they cannot be separated from the base 1.

[0047] As shown in Fig. 5, the first yoke 74 and the second yoke 75 are fixed on the base 1 and are located on opposite sides of the coil module 6. The first yoke 74 is located on one side of the coil module 6 in the transverse direction X, one end of the first yoke 74 is connected to one end of the iron core 63, and the other end of the first yoke 74 can be in contact with and connected to one end of the armature 72 (that is, when the permanent magnet 71 swings to one side, the other end of the first yoke 74 overlaps with one end of the armature 72, and when the permanent magnet 71 swings to the other side, the other end of the first yoke 74 is separated from one end of the armature 72). The second yoke 75 is located on the other side of the coil module 6 in the transverse direction X, one end of the second yoke 75 is connected to the other end of the iron core 63, and the other end of the second yoke 75 can be in contact with and connected to the other end of the armature 72 (that is, when the permanent magnet 71 swings to the other side, the other end of the second yoke 75 overlaps with the other end of the armature 72, and when the permanent magnet 71 swings to one side, the other end of the second yoke 75 is separated from the other end of the armature 72). When the impulse voltage is applied to the coil 62, the permanent magnet 71 swings to one side around the rotating shaft 731, and the constant magnetic field S1 is generated at the permanent magnet 71, the armature 72, the first yoke 74, the iron core 63 and the second yoke 75. The first centerline L1 of the constant magnetic field S1 passes through the center of the permanent magnet 71, that is, passes through the center of the rotating shaft 731 (the center of the rotating shaft 731 and the center of the permanent magnet 71 can be located on one straight line), and the rotating shaft 731 is located in the middle of the magnetic circuit structure 7. Therefore, the magnetic circuit structure 7 is offset from the contact structure 2 and closer to the second end of the contact structure 2.

[0048] In some embodiments, the distance between the first centerline L1 and the second centerline L2 is 6-9 mm. For example, in addition to the above two end values, the distance between the first centerline L1 and the second centerline L2 can also be 7 mm, 7.5 mm, 8 mm, 8.5 mm. By setting the distance between the first centerline L1 and the second centerline L2 to the above values, the constant magnetic field S1 can avoid the influence of the first alternating magnetic field S2 generated by the first static lead-out piece 3. Those skilled in the art can set it according to actual conditions, and no special limitation is made here.

[0049] In some embodiments, as shown in Fig. 7, the magnetic latching relay further includes a current transformer 8, and a portion of the second static lead-out piece 4 extending out of the base 1 is inserted into the current transformer 8, so that the current transformer 8 is located between the lead-out terminal 5 and the second contact set. Since the current transformer 8 is located between the lead-out terminal 5 and the second contact set, the current transformer 8 can block the second alternating magnetic field S3 generated by the lead-out terminal 5, shield the second alternating magnetic field S3, and avoid its influence on the constant magnetic field S1 formed by the magnetic circuit structure 7 and the coil module 6.

[0050] In some embodiments, as shown in Fig. 1, the base 1 has a first side wall 11 and a second side wall 12 that are opposite to each other in the transverse direction X. The first side wall 11 is close to the first end 21 of the contact structure 2, and the second side wall 12 is close to the second end 22 of the contact structure 2. The portion of the first side wall 11 that does not correspond to the contact structure 2 in the transverse direction X is concaved inwardly, and the portion of the second side wall 12 that does not correspond to the contact structure 2 in the transverse direction X is protruded outwardly.

[0051] That is, due to the bias of the magnetic circuit structure 7 and the coil module 6, the side wall of the base 1 corresponding to the magnetic circuit structure 7 and the coil module 6 is also bias, so that the volume of the magnetic latching relay can be minimized and materials can be saved.

[0052] It should be noted that, in the embodiment of the disclosure, "inside" and "outside" can be understood as the inside and outside of the base 1. For example, the contact structure 2, the coil module 6 and the magnetic circuit structure 7 are all located inside the base 1, while the lead-out terminal 5 is located outside the base 1.

[0053] In some embodiments, as shown in Fig. 1, the magnetic latching relay further includes a first push card 91 and a second push card 92. The first push card 91 is located in the base 1 and close to the first side wall 11, and one end of the first push card 91 is connected to the first movable contact 211 of the contact structure 2. The second push card 92 is located in the base 1 and close to the second side wall 12, and one end of the second push card 92 is connected to the second movable contact 221 of the contact structure 2, and the second push card 92 protrudes toward the second side wall 12.

[0054] Continuing to refer to Fig. 1, the injection molded part 73 of the magnetic circuit structure 7 further includes a first swing arm 732 and a second swing arm 733, the first swing arm 732 is connected to the first push card 91, and the second swing arm 733 is connected to the second push card 92.

[0055] When a forward pulse voltage is applied to the coil 62, the permanent magnet 71 swings to one side and drives the armature 72 to swing, so that one of the armatures 72 overlaps with the first yoke 74 and the other overlaps with the second yoke 75. The permanent magnet 71, the armature 72, the first yoke 74, the iron core 63, and the second yoke 75 form a constant magnetic field S1. At the same time, the permanent magnet 71 drives the first swing arm 732 and the second swing arm 733 to swing, and the first swing arm 732 drives the first push card 91 to move in the longitudinal direction Y. The first swing arm 732 drives the first movable contact 211 to move in the direction close to the first static contact 212, so that the first movable contact 211 and the first static contact 212 are in contact. The second swing arm 733 drives the second push card 92 in the longitudinal direction Y. The second swing arm 733 moves upward on the Y axis, so that the second swing arm 733 drives the second movable contact 221 to move toward the second static contact 222, so that the second movable contact 221 and the second static contact 222 are in contact, thereby the contact structure 2 is connected, that is, the relay is connected, and the external load circuit is turned on. When the coil 62 is powered off, the permanent magnet 71 can maintain the constant magnetic field S1, thereby maintaining the positions of the first swing arm 732 and the second swing arm 733, and keeping the relay closed.

[0056] When the coil 62 is supplied with a reverse pulse voltage, the permanent magnet 71 swings to the other side, and drives the armature 72 to swing to the other side, wherein one of the armatures 72 overlaps with the second yoke 75, and the other overlaps with the first yoke 74, forming another reverse constant magnetic field S1. At the same time, the permanent magnet 71 drives the first swing arm 732 and the second swing arm 733 to swing in opposite directions, so that the first movable contact 211 and the first static contact 212 are disconnected, the second movable contact 221 and the second static contact 222 are disconnected, that is, the relay is disconnected, and the external load circuit is turned off. When the coil 62 is powered off, the permanent magnet 71 can maintain the constant magnetic field S1, thereby maintaining the positions of the first swing arm 732 and the second swing arm 733, and keeping the relay disconnected.

[0057] In the embodiment of the disclosure, the magnetic circuit structure 7 and the coil module 6 are offset from the second centerline L2 of the contact structure 2, the portion of the second push card 92 that does not correspond to the contact structure 2 protrudes toward the second side wall 12, the first push card 91 and the second push card 92 are not symmetrical structures, and since the first swing arm 732 is connected to the first push card 91 and the second swing arm 733 is connected to the second push card 92, the arm lengths of the first swing arm 732 and the second swing arm 733 may be different, and the swing radii of the first swing arm 732 and the second swing arm 733 may be different.

[0058] In summary, when the alternating current of the load is turned on, the alternating magnetic field generated by the first static lead-out piece 3 may affect the constant magnetic field S1 generated by the magnetic circuit structure 7. In the embodiment of the disclosure, by setting the a guiding groove 33 at the first lead-out part 31 of the first static lead-out piece 3, the guiding groove 33 extends from one side of the first lead-out part 31 close to the second end 22 of the contact structure 2 along a transverse direction X and does not penetrate the first lead-out part 31, when load current flows through the first lead-out part 31 of the first static lead-out piece 3, due to the guiding groove 33, the load current flows the first lead-out part 31 far away from the second end 22 of the contact structure 2, so that the load current is far away from the magnetic circuit structure 7, thereby avoiding the influence of the alternating magnetic field generated at the first lead-out part 31 on the constant magnetic field S1 of the magnetic circuit structure 7, and improving the stability of the magnetic latching relay.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

Claims

1. A magnetic latching relay, comprising:

a base;

a contact structure, located on the base, the contact structure has a first end and a second end in the transverse direction;

a first static lead-out piece, comprising a first lead-out part and a second lead-out part, the first lead-out part is connected to the first end of the contact structure, the second lead-out part is connected to the first lead-out part, and extends out from a bottom of the base along a vertical direction of the base; the first lead-out part has a guiding groove, the guiding groove extends from one side of the first lead-out part close to the second end along a transverse direction and does not penetrate the first lead-out part, and an opening of the guiding groove faces the second end of the contact structure; and

a coil module and a magnetic circuit structure, disposed on the base and located on one side of the contact structure in a longitudinal direction.

2. The magnetic latching relay according to claim 1, wherein the first end of the contact structure is provided with a first contact set comprising a first movable contact and a first static contact, and the second end is provided with a second contact set comprising a second movable contact and a second static contact;
the guiding groove is located at a side of the first static contact in a vertical direction.

3. The magnetic latching relay according to claim 2, wherein the contact structure comprises a first elastic piece extending along the transverse direction, the first elastic piece comprises two first static contacts at the first end and two second movable contacts at second end, the first elastic piece comprises a slit, the slit extends from the second end of the first elastic piece along the transverse direction to between the two first static contacts;
the guiding groove of the first static lead-out piece is located between the two first static contacts.

4. The magnetic latching relay according to claim 1, further comprising:
a second static lead-out piece, one end of the second static lead-out piece is connected to the second end of the contact structure and another end extends along the transverse direction away from the first end and extends out from a side wall of the base.

5. The magnetic latching relay according to claim 4, further comprising:
the lead-out terminal located outside the base, the lead-out terminal extends along the vertical direction, and one end of the lead-out terminal is connected to one end of the second static lead-out piece located outside the base; wherein a distance from the lead-out terminal to the second end is greater than a distance from the first static lead-out piece to the first end.

6. The magnetic latching relay according to claim 1, wherein a depth dimension of the guiding groove along the transverse direction is 1/3 to 1/2 of a dimension of the first lead-out part along the transverse direction.

7. The magnetic latching relay according to claim 2, when an impulse voltage is applied to the coil module, the magnetic circuit structure and the coil module can form a constant magnetic field, and a first centerline of the constant magnetic field in the longitudinal direction deviates from a second centerline between the first contact set and the second contact set and is closer to the second contact set.

8. The magnetic latching relay according to claim 7, wherein the coil module comprises:

a bobbin, located on the base;

a coil, wound around the bobbin; and

an iron core, located in the bobbin;

wherein the first centerline passes through the center of the bobbin.

9. The magnetic latching relay according to claim 8, wherein the magnetic circuit structure comprises:

a permanent magnet swingably disposed on the base;

an armature disposed on the permanent magnet, and the armature protrudes from the permanent magnet in the transverse direction; and

a first yoke and a second yoke both fixed on the base and located on opposite sides of the coil module, one end of the first yoke is connected to one end of the iron core, and another end of the first yoke can be in contact with and connected to one end of the armature;one end of the second yoke is connected to another end of the iron core, and another end of the second yoke can be in contact with and connected to another end of the armature;

when the impulse voltage is applied to the coil, the permanent magnet swings to one side, and the constant magnetic field is generated at the permanent magnet, the armature, the first yoke, the iron core and the second yoke, and the first centerline of the constant magnetic field passes through a center of the permanent magnet.

10. The magnetic latching relay according to claim 7, wherein a distance between the first centerline and the second centerline is 6 to 9 mm.

11. The magnetic latching relay according to claim 5, further comprising:
a current transformer, a portion of the second static lead-out piece extending from the base is inserted into the current transformer, so that the current transformer is located between the lead-out terminal and the second end of the contact structure.

12. The magnetic latching relay according to claim 2, wherein the base has a first side wall and a second side wall opposite to each other in the transverse direction, the first side wall being close to the first end of the contact structure, and the second side wall is close to the second end of the contact structure;
wherein a portion of the first side wall that does not correspond to the contact structure in the transverse direction is concaved inward, and a portion of the second side wall that does not correspond to the contact structure in the transverse direction is convex outward.

13. The magnetic latching relay according to claim 12, further comprising:

a first push card located in the base and close to the first side wall, one end of the first push card is connected to the first movable contact of the contact structure; and

a second push card located in the base and close to the second side wall, one end of the second push card is connected to the second movable contact of the contact structure, and the second push card is convex toward the second side wall.

Drawing