relay

Abstract

The present disclosure provides a relay including a contact assembly (2), a short-circuit prevention assembly (3), and a support member (6). The contact assembly (2) includes a movable contact (22) and a pair of fixed contact lead-out ends (21) that can be brought into contact with or separated from the movable contact (22). The short-circuit prevention assembly (3) includes an upper magnetic conductive body (31) and a lower magnetic conductive body (32). The support member (6) is used to mount the upper magnetic conductive body (31). The lower magnetic conductive body (32) is fixed to the bottom of the movable contact (22) so as to generate an attractive force to resist an electro-mechanical repulsive force between the movable contact (22) and the fixed contact lead-out end (21) when a large fault current is generated in the movable contact (22), and a magnetic conductive circuit can be formed between the upper magnetic conductive body (31) and the lower magnetic conductive body (32). In the present disclosure, the upper magnetic conductive body (31) has a fixed structure mounted by the support member (6), so that the holding force requirement can be met without the need for a large coil, contributing to the weight reduction of the relay.

Description

[Technical Field]

[0001] [CROSS-REFERENCE TO RELATED APPLICATIONS] This disclosure claims priority to Chinese Patent Application No. 202222685510.X, filed on October 12, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present disclosure relates to the technical field of power equipment, and in particular to relays. [Background technology]

[0003] As the demand for driving range of new energy vehicles continues to increase, high-voltage DC relays are required to have low heat dissipation under normal circumstances. However, when the battery pack is short-circuited, the relay must be able to withstand high short-circuit current and voltage due to the large battery capacity. When the short-circuit load is very large, the electromotive repulsive force generated by the short-circuit current causes the contacts of the high-voltage DC relay to bounce open, resulting in an arc. Because the load short-circuit current and voltage are both very high, it is easy for a sudden, intense arc discharge to occur at the contacts.

[0004] In the prior art, a moving assembly is typically equipped with a short-circuit prevention ring electromagnetic structure. When a short-circuit current generates an electromotive repulsive force, the upper magnetic body in the short-circuit prevention ring electromagnetic structure exerts an electromagnetic attractive force on the lower magnetic body, securing the lower magnetic body to the moving contact, ensuring that the moving contact does not bounce open. The moving assembly must be supported by the holding force of the moving iron core. Because the holding force is an electromagnetic force generated by energizing the coil, limiting the coil power limits the holding force, which in turn limits the holding force supporting the short-circuit prevention ring. Therefore, when the short-circuit current reaches a certain set value, the lower magnetic body also generates an electromagnetic attractive force against the upper magnetic body. If the holding force of the iron core cannot support the electromagnetic attractive force of the lower magnetic body against the upper magnetic body, the contact will still bounce open.

[0005] To solve this problem, conventional technology can only increase the size of the coil to improve the holding force of the movable core. However, a larger coil increases the volume of the entire relay, which makes it impossible to meet the demand for a lightweight relay. Summary of the Invention

[0006] The embodiments of the present disclosure provide a relay that can meet the requirements for safety and light weight.

[0007] The relay of the embodiment of the present disclosure includes: a contact assembly comprising a movable contact and a pair of fixed contact lead-out ends, the movable contact being capable of coming into contact with or being separated from the pair of fixed contact lead-out ends; a short circuit prevention assembly comprising an upper magnetic conductive body and a lower magnetic conductive body; a support member that is fixedly disposed relative to the fixed contact lead-out end and that supports the upper magnetic conductive body; The lower magnetic body is fixed to the bottom of the movable contactor so as to generate an attractive force to resist the electro-mechanical repulsive force between the movable contactor and the fixed contact pull-out end when a large fault current occurs in the movable contactor, and a magnetic conductive circuit can be formed between the upper magnetic body and the lower magnetic body.

[0008] According to some embodiments of the present disclosure, the device further includes an insulating member, the insulating member being disposed between the support member and the upper magnetic conductive body, and the support member supporting the upper magnetic conductive body via the insulating member.

[0009] According to some embodiments of the present disclosure, one of the upper magnetic conductive body and the insulating member is provided with a positioning block, and the other is provided with a positioning groove, and the positioning block is at least partially positioned in the positioning groove.

[0010] According to some embodiments of the present disclosure, the support member, the insulating member, and the upper magnetic conductive body are an integrally formed structure.

[0011] According to some embodiments of the present disclosure, the insulating member has a positioning hole on a side facing the support member, and the support member is at least partially disposed in the positioning hole.

[0012] According to some embodiments of the present disclosure, the insulating members are multiple and distributed along the width direction of the movable contact, and the insulating members are arranged on both sides of the upper magnetic body in the longitudinal direction.

[0013] According to some embodiments of the present disclosure, the number of the support members is plural, and the support members are arranged between the pair of fixed contact lead-out ends and distributed on both sides of the upper magnetic body.

[0014] According to some embodiments of the present disclosure, the device further includes a contact vessel, the contact vessel including a yoke plate, and the support member disposed on the yoke plate.

[0015] According to some embodiments of the present disclosure, the contact container further comprises a ceramic cover, the ceramic cover is disposed on the yoke plate, the fixed contact lead end extends at least partially within the ceramic cover, and the support member, the movable contact and the short-circuit prevention assembly are disposed within the ceramic cover.

[0016] According to some embodiments of the present disclosure, a gap is provided between the upper magnetic conductive body and the upper inner wall of the ceramic cover so that the upper magnetic conductive body does not contact the upper inner wall of the ceramic cover.

[0017] According to some embodiments of the present disclosure, the support member is a columnar structure.

[0018] According to some embodiments of the present disclosure, the drive assembly further includes a push rod unit, and the push rod unit is capable of driving the movable contact to move in a direction adjacent to the fixed contact pull-out end, The movable contact and the lower magnetic conductive body are movable parts, and the movable part and the push rod unit are fitted together via a limit protrusion and a limit hole.

[0019] According to some embodiments of the present disclosure, the movable part further comprises a support portion, the support portion is fixedly connected to the lower magnetic body, the support portion is disposed between the push rod unit and the lower magnetic body, the push rod unit and the support portion are engaged with each other via the limit protrusion and the limit hole, and the push rod unit drives and moves the movable contactor.

[0020] The embodiment disclosed above has at least the following advantages or beneficial effects.

[0021] In the relay of the embodiment of the present disclosure, when the movable contactor comes into contact with the fixed contact at the bottom of a pair of fixed contact drawer ends, current flows into one of the fixed contact drawer ends, passes through the movable contactor, and flows out of the other fixed contact drawer end, connecting the load.

[0022] In the relay of the embodiment of the present disclosure, the lower magnetic conductive body is disposed below the movable contactor, and is capable of moving together with the movable contactor toward the fixed contact lead-out end. The lower magnetic conductive body is capable of moving toward the upper magnetic conductive body, forming a magnetic conductive circuit between the upper and lower magnetic conductive bodies. When a large fault current occurs in the movable contactor, the upper magnetic conductive body is disposed above the movable contactor and the lower magnetic conductive body is disposed below the movable contactor, which is equivalent to the movable contactor being sandwiched between the upper and lower magnetic conductive bodies. When the upper magnetic conductive body generates an attractive force toward the lower magnetic conductive body, this attractive force not only attracts the movable contactor but also resists the electrical repulsive force generated by the fault current between the movable contactor and the fixed contact lead-out end, thereby avoiding the situation where the movable contactor and the fixed contact lead-out end separate and cause an arc explosion, and ensuring the reliability and safety of the contact between the movable contactor and the fixed contact lead-out end.

[0023] In the relay of the embodiment of the present disclosure, the support member carries the upper magnetic body, and the support member is fixedly disposed relative to the fixed contact lead-out end, i.e., the upper magnetic body is fixed at a stationary fixed position other than the drive assembly, and the upper and lower magnetic bodies of the short-circuit prevention assembly form a magnetic conductive circuit, and the electromagnetic attractive force generated by this magnetic conductive circuit acts on the stationary member, eliminating the risk of the movable iron core becoming dislodged and the relay being burned or exploded due to the action of a strong electric arc. In this case, because the upper magnetic body has a fixed structure and the support member serves to carry the upper magnetic body, the drive assembly does not need to withstand the attractive force of the lower magnetic body to the upper magnetic body in the event of a short circuit, and the holding force requirement can be met without a large coil, and the lightweight requirement for the relay can be met. [Brief explanation of the drawings]

[0024] The above and other features and advantages of the present disclosure will become more apparent from the detailed description of illustrative embodiments thereof, which proceeds with reference to the accompanying drawings. [Figure 1] FIG. 1 is a schematic diagram illustrating the structure of a relay according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 shows a top view of a relay according to a first embodiment of the present disclosure. [Figure 3] FIG. 3 shows a cross-sectional view taken along the plane AA in FIG. [Figure 4] FIG. 4 shows an exploded view of a relay according to a first embodiment of the present disclosure. [Figure 5] FIG. 5 is a schematic diagram illustrating an operating state of the relay according to the first embodiment of the present disclosure. [Figure 6] FIG. 6 is a schematic diagram illustrating the structure of a relay according to a second embodiment of the present disclosure. [Figure 7] FIG. 7 shows a top view of a relay according to a second embodiment of the present disclosure. [Figure 8] FIG. 8 shows a cross-sectional view along the plane BB in FIG. [Figure 9] FIG. 9 shows an exploded view of a relay according to a second embodiment of the present disclosure. [Figure 10]FIG. 10 is a schematic diagram illustrating the structure of a relay according to a third embodiment of the present disclosure. [Figure 11] FIG. 11 is a cross-sectional view of a relay according to a third embodiment of the present disclosure. [Figure 12] FIG. 12 is an exploded view of a relay according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0025] Here, the reference numerals are explained as follows: 1. Contact container; 2. Contact assembly; 3. Short circuit prevention assembly; 4. Driving assembly; 5. Connecting member; 6. Support member; 7. Insulating member; 11. Ceramic cover; 12. Yoke plate; 21. Fixed contact pull-out end; 22. Movable contact; 31. Upper magnetic conductor; 312. Gap; 32. Lower magnetic conductor; 41. Push rod unit; 411. Push rod; 412. Mounting seat; 413. Limit protrusion; 42. Support; 421. Baffle; 422. Limit hole; 43. Elastic members; 44. Electromagnet unit; 441. Coil bobbin; 442. Coil; 443. Moving iron core.

[0026] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in various forms and should not be construed as limited to the embodiments described herein. Although relative terms such as "above" and "below" are used herein to describe the relative relationship of one component to another component shown in the drawings, these terms are used herein merely for convenience, e.g., based on the orientation of the example shown in the drawings. It is understood that if the device shown in the drawings is inverted and turned upside down, the component described "above" would become the component located "below." Other relative terms, such as "top" and "bottom," have similar meanings. When a structure is "above" another structure, this can mean that the structure is integrally formed on the other structure, that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via the other structure.

[0027] The terms "a," "an," "the," and "said" are used to indicate the presence of one or more elements / components / etc. The terms "comprise" and "have" are open-ended and mean that other elements / components / etc. may be present in addition to the listed elements / components / etc. The terms "first," "second," etc. are used as indicative terms only and do not limit the number of their objects.

[0028] Example 1 As shown in Figures 1 to 4, Figure 1 is a schematic diagram showing the structure of a relay according to a first embodiment of the present disclosure, Figure 2 shows a top view of the relay according to the first embodiment of the present disclosure, Figure 3 shows a cross-sectional view along plane AA of Figure 2, and Figure 4 shows an exploded view of the relay according to the first embodiment of the present disclosure.

[0029] This embodiment provides a relay, which includes a contact assembly 2, which includes a movable contactor 22 and a pair of fixed contact lead-out ends 21, and the movable contactor 22 comes into contact with or separates from the pair of fixed contact lead-out ends 21. When the movable contactor 22 comes into contact with a fixed contact at the bottom of the pair of fixed contact lead-out ends 21, a current flows into one of the fixed contact lead-out ends 21, passes through the movable contactor 22, and flows out from the other fixed contact lead-out end 21, connecting a load.

[0030] If the short-circuit load is very large, the short-circuit current will generate an electromotive repulsive force between the movable contact 22 and the fixed contact lead terminal 21, causing the contacts to bounce open, generating an arc at the contacts, which may result in severe burning or even explosion. For this reason, as shown in FIGS. 1 to 4 , the relay of this embodiment also includes a short-circuit prevention assembly 3, which includes an upper magnetic conductor 31 and a lower magnetic conductor 32. The lower magnetic conductor 32 is disposed below the movable contact 22 to generate an attractive force to resist the electromotive repulsive force between the movable contact 22 and the fixed contact lead terminal 21 when a large fault current is generated in the movable contact 22, forming a magnetically conductive circuit between the upper magnetic conductor 31 and the lower magnetic conductor 32. The upper magnetic conductor 31 and the lower magnetic conductor 32 can be made of materials such as iron, cobalt, nickel, and alloys thereof.

[0031] The lower magnetic conductive body 32 is fixed to the lower part of the movable contact 22, and the lower magnetic conductive body 32 can move together with the movable contact 22 in a direction approaching the fixed contact lead-out end 21. The lower magnetic conductive body 32 can move in a direction approaching the upper magnetic conductive body 31, and a magnetic conductive circuit can be formed between the upper magnetic conductive body 31 and the lower magnetic conductive body 32. When a large fault current occurs in the movable contactor 22, by arranging the upper magnetic conductor 31 above the movable contactor 22 and the lower magnetic conductor 32 below the movable contactor 22, it is equivalent to the movable contactor 22 being sandwiched between the upper magnetic conductor 31 and the lower magnetic conductor 32. When the upper magnetic conductor 31 generates an attractive force on the lower magnetic conductor 32, this attractive force not only serves to attract the movable contactor 22 but also resists the electrical repulsive force generated by the fault current between the movable contactor 22 and the fixed contact lead-out end 21. This prevents the movable contactor 22 and the fixed contact lead-out end 21 from separating from each other and causing an arc explosion, and ensures the reliability and safety of the contact between the movable contactor 22 and the fixed contact lead-out end 21.

[0032] 3 and 4, the relay further includes a drive assembly 4, which includes a push rod unit 41. The push rod unit 41 drives the movable contact 22 to move it in a direction approaching the fixed contact lead-out end 21. The push rod unit 41 is movably arranged and applies power to the movable contact 22 to push and move the movable contact 22, thereby realizing contact and separation between the movable contact 22 and the fixed contact lead-out end 21.

[0033] If the upper and lower magnetic conductive bodies 31 and 32 are movable together, they must be supported by the holding force of the drive assembly 4. If the holding force cannot support the attractive force of the lower magnetic conductive body 32 against the upper magnetic conductive body 31, the upper and lower magnetic conductive bodies 31 and 32 will fall, and the movable contact 22 and the fixed contact lead-out end 21 will still be separated. In the prior art, the holding force is increased by increasing the coil size of the drive assembly 4, but increasing the volume of the coil makes it impossible to meet the demand for weight reduction.

[0034] For this reason, as shown in FIGS. 3 to 5, the relay according to this embodiment further includes a support member 6, which is used to place the upper magnetic conductive body 31 thereon.

[0035] By using the support member 6 to mount the upper magnetic conductive body 31, the support member 6 is fixedly positioned relative to the fixed contact lead-out end 21, i.e., the upper magnetic conductive body 31 is fixed at a fixed position other than the drive assembly 4, and the upper magnetic conductive body 31 and the lower magnetic conductive body 32 of the short-circuit prevention assembly 3 form a magnetic conductive circuit. The electromagnetic attractive force generated by this magnetic conductive circuit is switched from acting on moving parts such as the drive assembly 4 to acting on a fixed, stationary part, eliminating the risk of the movable iron core 443 becoming detached and the relay being burned or exploded due to the action of a strong electric arc. In this case, because the upper magnetic conductive body 31 has a fixed structure and the support member 6 serves to mount the upper magnetic conductive body 31, the drive assembly 4 does not need to withstand the attractive force of the lower magnetic conductive body 32 to the upper magnetic conductive body 31 during a short circuit. This means that the holding force requirement can be met even without a large coil 442, and the lightweight relay requirement can be met.

[0036] In one embodiment, the support member 6 is a columnar structure, which occupies little space and has good supporting and mounting strength.

[0037] In this embodiment, as shown in Figures 3 to 5, the relay further includes an insulating member 7 arranged between the support member 6 and the upper magnetic conductive body 31, and the support member 6 carries the upper magnetic conductive body 31 via the insulating member 7.

[0038] If the support member 6 is made of a metal material, the structural strength of the support member 6 is ensured. However, if the bottom of the support member 6 is fixed to a stationary member such as a metal plate, the insulating effect of the upper magnetic conductive body 31 is not ensured. By providing the insulating member 7 between the support member 6 and the upper magnetic conductive body 31, the insulating member 7 serves to insulate the support member 6 from the upper magnetic conductive body 31 and ensure the insulating effect of the upper magnetic conductive body 31. The support member 6 supports the insulating member 7, which in turn supports the upper magnetic conductive body 31, so that the upper magnetic conductive body 31 is placed on the support member 6 via the insulating member 7, and the insulating member 7 serves as an intermediate support. The insulating member 7 is specifically an insulating block, and the contact area between the insulating block and the upper magnetic conductive body 31 is relatively large, thereby improving the supporting effect for the upper magnetic conductive body 31.

[0039] The insulating member 7 is specifically made of an insulating material such as plastic.

[0040] It should be noted that, when an insulating member 7 is provided between the support member 6 and the upper magnetic conductive body 31, the support member 6 can be made of a metallic material or an insulating material, and it is understood that the material of the support member 6 is not limited. However, when an insulating member 7 is not provided between the support member 6 and the upper magnetic conductive body 31, the support member 6 must be made of an insulating material to avoid the risk of short-circuiting the upper magnetic conductive body 31.

[0041] 3 to 5, in this embodiment, a positioning block is provided on one of the upper magnetic conductive body 31 and the insulating member 7, and a positioning groove is provided on the other, and the positioning block is at least partially disposed in the positioning groove. The positioning block and the positioning groove fit together to ensure positioning between the upper magnetic conductive body 31 and the insulating member 7.

[0042] Specifically, the insulating member 7 is provided with a positioning block that protrudes toward the upper magnetic conductive body 31, and the upper magnetic conductive body 31 is provided with a positioning groove corresponding to the positioning block. Inserting the positioning block into the positioning groove is equivalent to embedding the positioning block in the positioning groove, thereby ensuring relative positional accuracy between the insulating member 7 and the upper magnetic conductive body 31.

[0043] In addition, a receiving groove is provided on the side of the upper magnetic conductive body 31 facing the insulating member 7, and the receiving groove is used to receive the insulating member 7. The receiving groove provides a receiving space for the insulating member 7, and at the same time, the side walls of the receiving groove serve to limit the position of the insulating member 7. Since the upper magnetic conductive body 31 is at least partially embedded in the receiving groove, the overall appearance of the upper magnetic conductive body 31 and the insulating member 7 resembles a rectangular structure, which is neat and aesthetically pleasing.

[0044] In this embodiment, the support member 6, the insulating member 7, and the upper magnetic conductive body 31 are integrally formed. By forming the support member 6, the insulating member 7, and the upper magnetic conductive body 31 integrally, the processes of individual manufacturing and assembly of components are omitted, and manufacturing costs can be effectively reduced.

[0045] In this embodiment, a positioning hole is provided on the side of the insulating member 7 facing the support member 6, and the support member 6 is at least partially inserted into the positioning hole.

[0046] If the upper end surface of the support member 6 comes into direct contact with the lower surface of the insulating member 7, there is a possibility that a relative positional deviation may occur between the insulating member 7 and the support member 6 during actual use. Therefore, the support member 6 is at least partially inserted into the positioning hole of the insulating member 7 to position the support member 6 and the insulating member 7 in advance.

[0047] In this embodiment, the number of support members 6 is plural, and the support members 6 are arranged between the pair of fixed contact lead-out ends 21 and distributed on both sides of the upper magnetic conductive body 31 .

[0048] By distributing a plurality of support members 6 on both sides of the upper magnetic conductive body 31, a balanced support for the upper magnetic conductive body 31 is ensured, and displacement of the upper magnetic conductive body 31 is prevented. By disposing a plurality of support members 6 between the pair of fixed contact lead-out ends 21, the insulating member 7 is also disposed between the pair of fixed contact lead-out ends 21, making the insulating member 7 less susceptible to the effect of the arc and eliminating the need to occupy arc extinguishing space.

[0049] In particular, the number of support members 6 provided in this embodiment is specifically four, and the four support members 6 are arranged at the four corners of the upper magnetic conductive body 31 to ensure a supporting effect for the upper magnetic conductive body 31. The present disclosure does not limit the specific number of support members 6, and the number can be adjusted according to actual production conditions.

[0050] In this embodiment, there are a plurality of insulating members 7, which are distributed along the width direction of the movable contact 22, and the insulating members 7 are arranged on both sides of the upper magnetic conductive body 31 in the length direction.

[0051] By disposing a plurality of insulating members 7 on both sides of the upper magnetic conductive body 31, a support balance for the upper magnetic conductive body 31 is ensured and displacement of the upper magnetic conductive body 31 is prevented. Since both ends in the length direction of the movable contactor 22 may come into contact with the fixed contact lead-out end 21, the plurality of insulating members 7 are distributed along the width direction of the movable contactor 22 so as to avoid the contact position between the movable contactor 22 and the fixed contact lead-out end 21.

[0052] In particular, the number of insulating members 7 provided in this embodiment is two, and the two insulating members 7 are respectively arranged on both sides of the upper magnetic conductive body 31, and each insulating member 7 corresponds to two supporting members 6, that is, the two supporting members 6 support each side of the upper magnetic conductive body 31 via one insulating member 7, and the supporting members 6 and insulating members 7 play the role of supporting the frame and ensure the supporting effect for the upper magnetic conductive body 31. This embodiment does not limit the specific number of insulating members 7, and can be adjusted according to actual production conditions.

[0053] 3 to 5, the relay further includes a contact container 1, which includes a yoke plate 12, and the support member 6 is disposed on the yoke plate 12. That is, the yoke plate 12 provides a fixed position for the support member 6. That is, the lower part of the support member 6 is fixed to the yoke plate 12, and the upper part of the support member 6 carries the upper magnetic conductive body 31 via the insulating member 7, thereby ensuring a supporting effect for the upper magnetic conductive body 31.

[0054] Furthermore, by connecting the upper magnetic conductive body 31 and the yoke plate 12 via the support member 6, or via the support member 6 and the insulating member 7, the upper magnetic conductive body 31 and the yoke plate 12 are insulated from each other, thereby improving the safety of the load.

[0055] In this embodiment, the contact vessel 1 also includes a ceramic cover 11 disposed on the yoke plate 12, the fixed contact lead-out end 21 extending at least partially within the ceramic cover 11, and the support member 6, the movable contact 22, and the short-circuit prevention assembly 3 disposed within the ceramic cover 11.

[0056] The fixed contact pull-out end 21 is disposed on the ceramic cover 11, which provides a fixed position for the fixed contact pull-out end 21. The support member 6, the movable contact 22 and the short-circuit prevention assembly 3 are disposed within the ceramic cover 11, the fixed contact pull-out end 21 extends at least partially within the ceramic cover 11, and the ceramic cover 11 provides an insulating environment for the support member 6, the short-circuit prevention assembly 3, the movable contact 22 of the contact assembly 2 and at least a portion of the fixed contact pull-out end 21.

[0057] If the upper magnetic conductive body 31 were in direct contact with the upper inner wall of the ceramic cover 11, the distance between the upper magnetic conductive body 31 and the fixed contact lead-out end 21 would be relatively short, making it difficult to ensure the requirements for withstand voltage and safety distance. For this reason, as shown in Figure 3, a gap 312 is provided between the upper magnetic conductive body 31 provided in this embodiment and the upper inner wall of the ceramic cover 11, so that the upper magnetic conductive body 31 does not come into contact with the upper inner wall of the ceramic cover 11.

[0058] By providing a gap 312 between the upper magnetic conductive body 31 and the upper inner wall of the ceramic cover 11, the entire upper magnetic conductive body 31 is not in contact with the upper inner wall of the ceramic cover 11, and the gap 312 between the upper magnetic conductive body 31 and the upper inner wall of the ceramic cover 11 increases the creepage distance between the two fixed contact lead-out ends 21 and ensures the insulation creepage distance requirement.

[0059] The movable contactor 22 may be linear, and the drive assembly 4 may be operated to bring both ends of the movable contactor 22 into contact with the two fixed contact lead-out ends 21 along the length of the movable contactor 22, respectively, to achieve load connection. The lower portion of the fixed contact lead-out end 21 functions as a fixed contact, and both ends of the movable contactor 22 in the length direction can function as movable contacts. The movable contacts at both ends of the movable contactor 22 may protrude from other parts of the movable contactor 22, or may be flush with other parts.

[0060] It is understood that the fixed contact can be arranged integrally or separately at the bottom of the fixed contact lead-out end 21, and the movable contact can be arranged integrally or separately at both ends of the movable contactor 22 in the longitudinal direction.

[0061] The two fixed contact lead-out ends 21 are disposed on the ceramic cover 11, for example, on the upper part of the ceramic cover 11. One end of each fixed contact lead-out end 21 extends into the contact chamber of the ceramic cover 11, and the other end protrudes from the outer surface of the ceramic cover 11. The one end of the fixed contact lead-out end 21 extending into the contact chamber is used to make contact with the movable contactor 22.

[0062] In this embodiment, as shown in Figures 3 to 5, the upper magnetic conductive body 31 has a linear structure, the upper magnetic conductive body 31 extends along the width direction of the movable contactor 22, and / or the lower magnetic conductive body 32 has a U-shaped structure, the opening of the lower magnetic conductive body 32 is positioned toward the movable contactor 22, and the portions of the lower magnetic conductive body 32 located on both sides of the width direction of the movable contactor 22 can abut against the upper magnetic conductive body 31.

[0063] The upper magnetic conductor 31 has a linear structure, and is positioned between the two movable contacts of the movable contactor 22, i.e., directly above the push rod unit 41, and extends along the width direction of the movable contactor 22, so that the upper magnetic conductor 31 and the lower magnetic conductor 32 match and correspond to each other.

[0064] The lower magnetic conductive body 32 has a U-shaped structure, with its opening facing the movable contactor 22 and its two side arms extending toward the upper magnetic conductive body 31. The two side arms of the lower magnetic conductive body 32 approach or contact both ends of the upper magnetic conductive body 31, respectively, to form a surrounding magnetic conductive ring along the width of the movable contactor 22. Since both ends of the length of the movable contactor 22 form movable contacts, the surrounding magnetic conductive ring formed along the width of the movable contactor 22 does not interfere. When a large fault current occurs in the movable contactor 22, an electromagnetic attractive force is generated between the movable contactor 22 and the fixed contact lead-out end 21 in the pressing direction of the movable contact, which resists the electro-magnetic repulsive force generated by the fault current.

[0065] The relay of the embodiment of the present disclosure includes a housing in which the contact receptacle 1, the contact assembly 2, the short-circuit prevention assembly 3, and the driving assembly 4 are disposed, and the housing serves to accommodate and protect the relay. The relay of the embodiment of the present disclosure does not necessarily need to include a housing, and these assemblies may be directly mounted on an application product such as a battery pack or an electrical control box after assembly.

[0066] The housing has a hollow chamber that is in communication with the outside of the housing. The contact vessel 1 is disposed in the hollow chamber, and since the contact vessel 1 is equipped with a ceramic cover 11 and a yoke plate 12, the ceramic cover 11 and the yoke plate 12 surround the contact chamber.

[0067] In one embodiment, the movable contact 22 and the lower magnetic conductive body 32 form a movable part, and the movable part and the push rod unit 41 are fitted together via the limit protrusion 413 and the limit hole 422. By fitting the limit protrusion 413 and the limit hole 422 together, the moving force of the push rod unit 41 is transmitted to the movable part, and the movable contact 22 can be brought into contact with or separated from the pair of fixed contact lead-out ends 21.

[0068] The limit hole 422 may be a through hole or a blind hole.

[0069] 3 to 5, the movable part also includes a support part 42 fixedly connected to the lower magnetic conductive body 32. The support part 42 is disposed between the push rod unit 41 and the lower magnetic conductive body 32. The push rod unit 41 and the support part 42 are fitted together via a limit protrusion 413 and a limit hole 422, and drive the movable contact 22 to move.

[0070] By disposing the support part 42 between the push rod unit 41 and the lower magnetic conductive body 32, the support part 42 functions as an intermediate connection between the push rod unit 41 and the lower magnetic conductive body 32. By fixedly connecting the support part 42 to the lower magnetic conductive body 32, the support part 42 serves to place the lower magnetic conductive body 32 and ensures a supporting effect for the lower magnetic conductive body 32. The limit protrusion 413 and the limit hole 422 fit together, so that the moving force of the push rod unit 41 is transmitted to the support part 42, driving and moving the movable contact 22, allowing the movable contact 22 to contact or separate from the pair of fixed contact lead-out ends 21.

[0071] The movable contactor 22 is provided with a first connecting hole, the lower magnetic conductive body 32 is provided with a second connecting hole corresponding to the first connecting hole, and the support portion 42 is provided with a third connecting hole corresponding to the second connecting hole. The connecting members 5 are specifically bolts, rivets, connecting pins, etc., and are inserted into the first connecting hole, the second connecting hole, and the third connecting hole, respectively, to ensure the stability of the connection between the movable contactor 22, the lower magnetic conductive body 32, and the support portion 42.

[0072] 3 to 5, the drive assembly 4 further includes an elastic member 43 disposed between the support portion 42 and the push rod unit 41, one end of which abuts against the push rod unit 41 and the other end of which abuts against the movable part. Specifically, the other end of the elastic member 43 abuts against the support portion 42, or the other end of the elastic member 43 passes through the support portion 42 and abuts against the lower magnetic conductive body 32.

[0073] Specifically, the elastic member 43 is a member having elasticity and a return function, such as a spring. When one end of the elastic member 43 abuts against the push rod unit 41 and the other end abuts against a movable part, the push rod unit 41 presses and moves the lower magnetic conductive body 32 in a direction approaching the upper magnetic conductive body 31 via the support part 42 and the elastic member 43. When one end of the elastic member 43 abuts against the push rod unit 41 and the other end passes through a through-hole in the center of the support part 42 and abuts against the lower magnetic conductive body 32, an attachment groove is provided in the bottom of the lower magnetic conductive body 32, and the other end of the elastic member 43 passes through the through-hole and is fixed to the attachment groove, and the push rod unit 41 can press and move the lower magnetic conductive body 32 in a direction approaching the upper magnetic conductive body 31 via the elastic member 43.

[0074] In this embodiment, as shown in FIGS. 3 to 5 , the push rod unit 41 includes a push rod 411 and a mounting seat 412. The upper part of the push rod 411 is fixed to the mounting seat 412. The push rod 411 provides power for movement relative to the ceramic cover 11, and the mounting seat 412 is used to mount a spring. Specifically, a positioning post and a positioning ring groove are provided in the center of the mounting seat 412. The positioning ring groove is disposed around the positioning post. The positioning post is inserted into the bottom of the elastic member 43 to radially position the bottom of the elastic member 43, and the positioning ring groove accommodates the elastic member 43 to radially position the bottom of the elastic member 43. At the same time, a mounting groove is provided in the bottom of the lower magnetic conductive body 32 to radially position the top of the elastic member 43, thereby achieving good positioning effect and preventing both ends of the elastic member 43 from shifting in the axial direction.

[0075] It is particularly noteworthy that the push rod 411 and the mounting seat 412 are integrally formed and realized by integral injection molding, which reduces the number of parts assembly steps and reduces manufacturing costs.

[0076] 3 to 5, in this embodiment, the support portion 42 is a U-shaped bracket, and the open end of the U-shaped bracket is disposed toward the push rod unit 41. In this way, the U-shaped bracket corresponds to a protective cover for the elastic member 43, and plays a role in protecting the elastic member 43.

[0077] In this embodiment, the two side arms of the U-shaped bracket are used to limit the elastic member 43. Here, the side arms of the U-shaped bracket and the push rod unit 41 are fitted together via the limit protrusions 413 and the limit holes 422.

[0078] Specifically, the two side arms of the U-shaped bracket limit the elastic member 43 to prevent it from coming loose during the compression and reset processes. The side arms of the U-shaped bracket and the push rod unit 41 are fitted together via the limit protrusions 413 and the limit holes 422, allowing the push rod unit 41 to pull and move the lower magnetic conductor 32 through the U-shaped bracket. At the same time, the two side arms of the U-shaped bracket extend along the movement direction of the push rod unit 41. That is, the two side arms of the U-shaped bracket have a certain height. To provide movement space for the compression or reset of the elastic member 43, the U-shaped bracket does not contact the mounting seat 412, and there is a certain height gap between the U-shaped bracket and the mounting seat 412.

[0079] It can be seen that a limit protrusion 413 is provided on one of the side arm of the U-shaped bracket and the push rod unit 41, and a limit hole 422 is provided on the other, and the limit hole 422 is used to limit the limit protrusion 413.

[0080] Specifically, a limit protrusion 413 is provided on the outer wall of the mounting seat 412 of the push rod unit 41, and limit holes 422 are provided on both side arms of the support part 42, and the limit protrusion 413 is at least partially provided within the limit hole 422, which serves to limit the limit protrusion 413 up and down.

[0081] In this embodiment, a gap is provided between the limit hole 422 and the limit protrusion 413 along the movement direction of the push rod unit 41 .

[0082] A gap is provided between the limit hole 422 and the limit protrusion 413, and this gap is provided along the movement direction of the push rod unit 41. This gap provides a moving space for the limit protrusion 413, ensuring the up and down movement of the support part 42, and also realizing the function of stopping the support part 42.

[0083] As shown in FIGS. 3 to 5, the operation process of the relay provided in this embodiment is as follows.

[0084] At the time of initial installation, the elastic member 43 is in a pre-compressed state, the support part 42, the lower magnetic conductive body 32 and the movable contact 22 are fixed, and due to the driving action of the push rod unit 41, the support part 42, the lower magnetic conductive body 32 and the movable contact 22 move synchronously, and at this time, the limit protrusion 413 contacts the lower hole wall of the limit hole 422 to limit the U-shaped bracket.

[0085] When the push rod unit 41 moves to an appropriate position, the movable contacts at both ends of the movable contactor 22 come into contact with the two fixed contact lead-out ends 21, respectively.

[0086] Next, the push rod unit 41 continues to move upward. Because the movable contact 22 is in contact with the lower ends of the two fixed contact lead-out ends 21, the movable contact 22 cannot continue to move upward. The push rod unit 41 continues to move upward, achieving contact overtravel. At this time, the limit protrusion 413 is in contact with the upper hole wall of the limit hole 422, so the limit protrusion 413 is located between the lower hole wall and the upper hole wall of the limit hole 422, providing movement space for overtravel. This allows the push rod unit 41 to continue to press the elastic member 43, which further provides upward support for the lower magnetic body 32, ensuring contact pressure. This further prevents the movable contact 22 from separating from the fixed contact lead-out ends 21 and ensuring reliable contact between the movable contact 22 and the fixed contact lead-out ends 21.

[0087] Example 2 This embodiment is similar to the first embodiment, except for the different structures of the support portion 42 and the mounting seat 412. In particular, it should be noted that in this embodiment, the limit protrusion 413 contacts the upper hole wall of the limit hole 422 in the initial stage.

[0088] As shown in Figures 6 to 9, Figure 6 is a schematic diagram showing the structure of a relay according to a second embodiment of the present disclosure, Figure 7 shows a top view of the relay according to the second embodiment of the present disclosure, Figure 8 shows a cross-sectional view along plane BB of Figure 7, and Figure 9 shows an exploded view of the relay according to the second embodiment of the present disclosure.

[0089] The support part 42 provided in this embodiment is a fixed plate with a planar structure, and a through hole is provided in the center of the fixed plate to provide an escape space for the elastic member 43, and the upper end of the elastic member 43 passes through the through hole and abuts against the mounting groove of the lower magnetic conductive body 32. The fixed plate has two protrusions arranged opposite each other, and the protrusions are provided with a third connecting hole, and the connecting members 5 are inserted into the first connecting hole, the second connecting hole, and the third connecting hole, respectively, to secure the movable contact 22, the lower magnetic conductive body 32, and the fixed plate together.

[0090] In this embodiment, as shown in Figures 8 and 9, the push rod unit 41 has a baffle 421 in the direction toward the support part 42, the baffle 421 is connected to the support part 42, and the baffle 421 is used to limit the position of the elastic member 43.

[0091] The support 42 is a fixed plate having a relatively low height due to its planar structure. A baffle 421 is disposed in the direction toward the support 42 of the push rod unit 41. That is, the baffle 421 is provided on the mounting seat 412 of the push rod unit 41. The baffle 421 limits the position of the elastic member 43 and prevents it from coming loose during the compression and reset processes. By connecting the baffle 421 to the fixed plate, the push rod unit 41 can drive the fixed plate and the lower magnetic body 32 to move synchronously. At the same time, the baffle 421 extends along the movement direction of the push rod unit 41. That is, the baffle 421 has a certain height, and a certain height gap is provided between the fixed plate and the mounting seat 412 to provide a moving space for the elastic member 43 to compress or reset.

[0092] In this embodiment, a limit protrusion 413 is provided on one of the support portion 42 and the push rod unit 41 , and a limit hole 422 is provided on the other. The limit hole 422 is used to limit the limit protrusion 413 .

[0093] Specifically, a limit protrusion 413 is provided on the fixed plate, a limit hole 422 or a limit groove is provided on the baffle 421 of the mounting seat 412 of the push rod unit 41, the limit protrusion 413 is at least partially provided within the limit hole 422 or limit groove, and two side walls of the limit hole 422 or limit groove along the movement direction of the push rod unit 41 are used to limit the limit protrusion 413.

[0094] It is particularly noteworthy that the number of limit protrusions 413 is two, the two limit protrusions 413 are arranged opposite each other, the two protrusions are arranged opposite each other, the two limit protrusions 413 and the two protrusions are arranged at an interval, and the angle between adjacent limit protrusions 413 and the protrusions is 90°.

[0095] Example 3 This embodiment is similar to embodiment 1, except that the support portion 42 is not provided, and the push rod unit 41 can push and pull the movable part by fitting the limit protrusion 413 and the limit hole 422 to each other.

[0096] As shown in Figures 10 and 11, the lower magnetic conductive body 32 provided in this embodiment includes a magnet body 320 and two side plates 321, which are respectively arranged on both sides of the magnet body 320. The push rod unit 41 has two baffles 421 in the direction toward the lower magnetic conductive body 32, and the baffles 421 and the side plates 321 are correspondingly fitted together through limit protrusions 413 and limit holes 422.

[0097] A baffle 421 is disposed on the push rod unit 41 in the direction toward the lower magnetic conductive body 32. That is, the baffle 421 is provided on the mounting seat 412 of the push rod unit 41. The baffle 421 serves to limit the elastic member 43 and prevent it from coming loose during the compression and resetting processes. By connecting the baffle 421 to the side plate, the push rod unit 41 can drive the lower magnetic conductive body 32 to move synchronously. At the same time, the baffle 421 extends along the movement direction of the push rod unit 41. That is, the baffle 421 has a certain height, and there is a certain height gap between the side plate 321 and the mounting seat 412 to provide a moving space for the elastic member 43 to compress or reset.

[0098] It can be seen that the push rod unit 41 is directly fitted to the moving part, which simplifies the assembly and avoids interference of the moving contact 22 with the upper magnetic conductive body 31 during the over-travel process.

[0099] It can be seen that the baffle 421 and the side plate 321 are provided with a limit protrusion 413 on one side, and the limit hole 422 is provided on the other side, and the limit hole 422 is used to limit the limit protrusion 413 .

[0100] Specifically, a limit protrusion 413 is provided on the side plate 321, a limit hole 422 is provided on the baffle 421 of the mounting seat 412 of the push rod unit 41, the limit protrusion 413 is at least partially positioned within the limit hole 422, and the limit hole 422 is used to limit the limit protrusion 413.

[0101] As shown in FIGS. 10 to 12 , the drive assembly 4 further includes an electromagnet unit 44, which includes a coil bobbin 441, a coil 442, a fixed iron core, and a movable iron core 443. The coil bobbin 441 has a hollow cylindrical shape and is made of an insulating material, and the coil 442 surrounds the coil bobbin 441. The fixed iron core is fixedly installed in a central hole of the coil bobbin 441, and the fixed iron core and the movable iron core 443 are arranged opposite each other. The movable iron core 443 is movably installed in the central hole of the coil bobbin 441 and is connected to the lower end of the push rod unit 41. When the coil 442 is energized, the movable iron core 443 is attracted to the fixed iron core and moves upward, thereby moving the push rod unit 41 upward. When the current to the coil 442 is cut off, the movable iron core 443 moves downward due to the action of the reset spring, and the movable iron core 443 moves downward the push rod unit 41. The movable iron core 443 and the push rod unit 41 can be connected by a method such as screw connection, rivet connection, or welding.

[0102] It should be understood that the present disclosure is not limited in its application to the precise construction and arrangement of components described herein. The present disclosure may have other embodiments and may be realized and carried out in various ways. The foregoing variations and modifications are within the scope of the present disclosure. The present disclosure as disclosed and defined herein should be understood to cover all alternative combinations of two or more individual features described or illustrated in the text and / or drawings. All of these different combinations constitute several alternative aspects of the present disclosure. The embodiments described herein represent the best modes known for carrying out the present disclosure and will enable those skilled in the art to utilize the present disclosure.

Claims

1. A contact assembly (2) comprising a movable contact (22) and a pair of fixed contact lead-out ends (21), wherein the movable contact (22) can be brought into contact with or separated from the pair of fixed contact lead-out ends (21); A short circuit prevention assembly (3) comprising an upper magnetic conductor (31) and a lower magnetic conductor (32); a support member (6) fixedly disposed relative to the fixed contact lead-out end (21) and on which the upper magnetic conductive body (31) is placed; The lower magnetic body (32) is fixed to the bottom of the movable contact (22) so as to generate an attractive force to resist the electromotive repulsive force between the movable contact (22) and the fixed contact lead-out end (21) when a large fault current occurs in the movable contact (22), and a magnetic conductive circuit is formed between the upper magnetic body (31) and the lower magnetic body (32). A relay characterized by:

2. The magnetic flux collector further includes an insulating member (7), the insulating member (7) being disposed between the support member (6) and the upper magnetic conductive body (31); The support member (6) supports the upper magnetic conductive body (31) via the insulating member (7).

2. The relay according to claim 1.

3. One of the upper magnetic conductive body (31) and the insulating member (7) is provided with a positioning block, and the other is provided with a positioning groove, and the positioning block is at least partially disposed in the positioning groove.

3. The relay according to claim 2.

4. The support member (6), the insulating member (7) and the upper magnetic conductive body (31) are integrally formed.

3. The relay according to claim 2.

5. A positioning hole is provided on the insulating member (7) on the side facing the support member (6), and the support member (6) is at least partially disposed in the positioning hole.

3. The relay according to claim 2.

6. The number of the insulating members (7) is plural and distributed along the width direction of the movable contact (22), The insulating members (7) are arranged on both sides of the upper magnetic conductive body (31) in the longitudinal direction.

3. The relay according to claim 2.

7. The number of the support members (6) is plural, and the support members (6) are arranged between the pair of fixed contact lead-out ends (21) and distributed on both sides of the upper magnetic conductive body (31).

3. The relay according to claim 2.

8. The contact vessel (1) further includes a yoke plate (12), and the support member (6) is disposed on the yoke plate (12).

2. The relay according to claim 1.

9. The contact vessel (1) further comprises a ceramic cover (11), the ceramic cover (11) is disposed on the yoke plate (12), the fixed contact lead end (21) extends at least partially within the ceramic cover (11), and the support member (6), the movable contact (22), and the short-circuit prevention assembly (3) are disposed within the ceramic cover (11).

9. The relay according to claim 8.

10. A gap (312) is provided between the upper magnetic conductive body (31) and the upper inner wall of the ceramic cover (11) so that the upper magnetic conductive body (31) does not come into contact with the upper inner wall of the ceramic cover (11).

10. The relay according to claim 9.

11. The support member (6) has a columnar structure.

2. The relay according to claim 1.

12. Further comprising a drive assembly (4), said drive assembly (4) comprising a push rod unit (41); The push rod unit (41) can drive the movable contact (22) to move it in a direction approaching the fixed contact lead-out end (21), The movable contact (22) and the lower magnetic conductive body (32) are movable parts, and the movable part and the push rod unit (41) are fitted together via a limit protrusion (413) and a limit hole (422).

12. A relay according to any one of claims 1 to 11.

13. The movable part further includes a support part (42), the support part (42) is fixedly connected to the lower magnetic conductive body (32), the support part (42) is disposed between the push rod unit (41) and the lower magnetic conductive body (32), the push rod unit (41) and the support part (42) are fitted together via the limit protrusion (413) and the limit hole (422), and the push rod unit (41) drives and moves the movable contact (22).

13. The relay according to claim 12.

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