Power relay with short-circuit current resisting function

Abstract

The utility model discloses a power relay with an anti-short-circuit current function, which relates to the technical field of power relays and comprises a relay shell. The relay base is arranged in the relay shell; the coil assembly is arranged on one side in the relay base and extends to the bottom of the relay base; the armature reed abuts against the coil assembly and is arranged above the coil assembly; the movable contact structure abuts against the armature reed and is arranged on the side face of the coil assembly. The movable contact structure extends to the bottom of the relay base. According to the utility model, the current flow directions of the static end pin of the power relay and the elastic sheet are opposite, and Lorentz forces generated by the current repel each other, so that the riveting contact point on the elastic sheet is pushed to the contact point of the reed, thereby overcoming an electric repulsive force generated by a short-circuit current, and realizing the safety protection of a relay product; and the safety and the service life reliability of the relay in the use process are greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of power relay technology, specifically a power relay with short-circuit current protection function. Background Technology

[0002] A power relay is a device that generates a sudden change in the output circuit of one or more electrical appliances when the input quantity (or excitation quantity) meets certain specified conditions. It can be used in neutral-point directly grounded systems as a directional element for zero-sequence current protection. With the development of new energy technologies such as photovoltaic energy storage, solar energy, and wind energy, the safety conditions for the use of power relays are becoming increasingly stringent, and the lifespan requirements for the relays themselves are also increasing.

[0003] A Chinese utility model patent with authorization announcement number CN220138207U discloses a power relay, including a housing, relay pins, a PCB board, an LCD indicator light, a reset component, an armature, a yoke, a fixed connecting frame, an electromagnetic structure, a spring, a cap, a moving contact, an upper stationary contact, and a lower stationary contact. The relay pins include a first relay pin, a second relay pin, a third relay pin, and a fourth relay pin. The first relay pin is connected to the PCB board. The PCB board is fixedly mounted inside the housing. The LED indicator light is mounted on the PCB board and electrically connected to the PCB board. The fixed connecting frame is fixedly connected to the spring. A moving contact is provided on the spring. The third relay pin is connected to the lower stationary contact, and the fourth relay pin is connected to the upper stationary contact. This utility model uses a cold-light emission mode for the LED surface-mount indicator light, which does not generate a large amount of heat during the emission process, and the temperature does not rise significantly. Therefore, compared with diode LEDs, it does not generate additional heat, reducing the aging of the equipment caused by heat accumulation due to temperature rise.

[0004] Currently, traditional power relays have the following problems:

[0005] When a power relay is in operation, if a short-circuit current is generated in the circuit, traditional power relays have a weak ability to withstand short-circuit current (or no ability to withstand short-circuit current). As a result, the current will contract sharply near the internal contact points of the power relay, generating an electric repulsive force. This can easily cause the power relay to burn out and fail to work properly, resulting in low safety. Utility Model Content

[0006] The purpose of this invention is to provide a power relay with short-circuit current protection function to solve the problems mentioned in the background art.

[0007] To achieve the above-mentioned objectives, the present invention adopts the following technical solution:

[0008] This utility model provides a power relay with short-circuit current protection, comprising a relay housing; a relay base installed inside the relay housing; a coil assembly disposed on one side inside the relay base and extending to the bottom of the relay base; an armature spring contacting the coil assembly and disposed above the coil assembly; and a moving contact structure contacting the armature spring and disposed on the side of the coil assembly, the moving contact structure extending to the bottom of the relay base.

[0009] The moving contact structure includes: a relay spring installed inside the relay base and extending to the outside of the relay base; a relay spring installed on one side of the top of the relay spring; a first contact installed on the inner side of the bottom of the relay spring; a spring contact assembly disposed on the side of the first contact; and an armature spring that abuts against the spring contact assembly.

[0010] Preferably, the internal space of the relay base is divided into two parts at the center by a middle partition, and the side of the middle partition near the relay spring is divided into four parts by multiple side partitions. Spring contact assemblies are provided on the sides of the side partitions.

[0011] The top of the intermediate partition is elastically provided with an armature spring.

[0012] Preferably, the coil assembly has coil leads extending from its bottom, and multiple coil leads are provided, all of which extend to the bottom of the relay base.

[0013] Preferably, the relay spring is bent, a gap is left between the relay spring and the relay reed, and the direction of the short-circuit current inside the relay spring is perpendicular to the direction of the Lorentz magnetic force generated by the first contact.

[0014] The relay spring is recessed inward on the side near the bottom of the first contact, and the bottom of the relay spring has a stationary foot extending to the outside of the relay base.

[0015] Preferably, the reed contact assembly includes: a second contact abutting against the side of the first contact; a first movable reed mounted on the outside of the second contact; a second movable reed mounted on the side of the first movable reed; an auxiliary movable terminal abutting against the second movable reed; and an armature reed abutting against the auxiliary movable terminal.

[0016] Preferably, the length of the first movable spring is less than the length of the second movable spring, and both the first and second movable springs are elastically disposed inside the relay base.

[0017] The auxiliary moving terminal is elastically disposed inside the injection molded part, and the injection molded part is installed on one side of the top of the intermediate partition.

[0018] Compared with existing technologies, one or more of the above technical solutions have the following beneficial effects:

[0019] 1. By utilizing the opposite current flow directions of the stationary pin and the spring contact, the Lorentz magnetic force generated by the current repulses each other, that is, the riveted contact point on the spring contact is pushed onto the spring contact point, thereby overcoming the electro-repulsive force generated by the short-circuit current, realizing the safety protection of the relay product, greatly improving the safety and life reliability of the relay during use, better meeting the needs of customers and the market, and enhancing the core competitiveness of the product.

[0020] 2. This utility model has the function of resisting short-circuit current. When a short-circuit current is generated in the circuit, a large electro-repulsive force will be generated near the contact point due to the rapid contraction of the current. In order to overcome the electro-repulsive force generated by the short-circuit current, the current flow of the stationary end and the spring is opposite. The Lorentz magnetic force generated by the current repulses each other. The repulsive Lorentz magnetic force can just cancel the electro-repulsive force generated by the short-circuit current. That is, the riveted contact point on the spring is pushed onto the spring contact point, so that the two contacts are more tightly connected and will not repel each other, thus achieving the function of resisting short-circuit current. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0023] Figure 1 This is a schematic diagram of the overall structure of the relay housing after disassembly.

[0024] Figure 2 This is a schematic diagram of the overall structure of the relay housing after disassembly.

[0025] Figure 3 This is a schematic diagram of the structure of the relay base of this utility model;

[0026] Figure 4 This is an exploded view of the moving contact structure of this utility model;

[0027] Figure 5This is a schematic diagram of the connection structure of the relay spring and spring contact assembly of this utility model;

[0028] Figure 6 This is a schematic diagram of the overall structure of this utility model after assembly;

[0029] In the picture:

[0030] 10. Relay housing; 20. Relay base; 201. Intermediate partition; 202. Side partition; 30. Coil assembly; 301. Coil foot; 40. Armature spring; 50. Moving contact structure; 501. Relay spring; 5011. Stationary foot; 502. Relay spring; 503. First contact; 504. Spring contact assembly; 5041. Second contact; 5042. First moving spring; 5043. Second moving spring; 5044. Auxiliary moving terminal; 5045. Injection molded part. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0032] Please see Figures 1-6 A power relay with short-circuit current protection includes a relay housing 10; a relay base 20 installed inside the relay housing 10; a coil assembly 30 disposed inside the relay base 20 and extending to the bottom of the relay base 20; an armature spring 40 abutting against the coil assembly 30 and disposed above the coil assembly 30; and a moving contact structure 50 abutting against the armature spring 40 and disposed on the side of the coil assembly 30, the moving contact structure 50 extending to the bottom of the relay base 20, the moving contact structure 50 including: a relay spring 501 installed inside the relay base 20 and extending to the outside of the relay base 20; a relay spring 502 installed on the top side of the relay spring 501; a first contact 503 installed on the bottom inner side of the relay spring 502; a spring contact assembly 504 disposed on the side of the first contact 503; and an armature spring 40 abutting against the spring contact assembly 504.

[0033] In practical use, the above solution involves first installing the relay spring 501, relay contact 502, first contact 503, spring contact assembly 504, and coil assembly 30 into the relay base 20 and securing them. Then, the armature spring 40 is assembled with the coil assembly 30, and the load system and transmission system are assembled using hooks for fixation. After this assembly, the relay housing 10 is fitted onto the outside of the relay base 20 and secured using a sealing process, thus completing the assembly of the entire power relay.

[0034] For details, please refer to the following: Figure 3 The space inside the relay base 20 is divided into two parts by a middle partition 201 at the center of the relay base 20. The side of the middle partition 201 near the relay spring 501 is divided into four parts by multiple side partitions 202. The side of the side partition 202 is provided with a spring contact assembly 504. The top of the middle partition 201 is elastically provided with an armature spring 40.

[0035] The power relay with short-circuit current protection function of this utility model divides the internal space of the relay base 20 into multiple parts through the design of the middle partition 201 and multiple side partitions 202, which are used to install and assemble different components of the relay, ensuring that the components of each part will not interfere with or conflict, and making the most of the limited internal space of the relay base 20.

[0036] For details, please refer to the following: Figure 2 The coil assembly 30 has coil pins 301 extending from its bottom. Multiple coil pins 301 are provided, and all of them extend to the bottom of the relay base 20.

[0037] The power relay with short-circuit current protection function of this utility model can be used to receive control signals to activate the entire power relay through the design of coil pin 301. The rated voltage of coil assembly 30 is marked on coil pin 301.

[0038] For details, please refer to the following: Figure 4 and Figure 5 The relay spring 502 is bent, and there is a gap between the relay spring 502 and the relay spring 501. The direction of the short-circuit current inside the relay spring 502 is perpendicular to the direction of the Lorentz magnetic force generated by the first contact 503. The side of the relay spring 501 near the bottom of the first contact 503 is recessed inward. The bottom of the relay spring 501 is provided with a stationary foot 5011 extending to the outside of the relay base 20.

[0039] This utility model discloses a power relay with short-circuit current protection. When a short-circuit current occurs in the internal circuit of the power relay, a large electrodynamic repulsion force is generated near the first contact 503 due to the rapid contraction of the current. To overcome this electrodynamic repulsion force, the current flows in opposite directions at the stationary pin 5011 and the relay spring 502, resulting in a repulsive Lorentz force (located on the first contact 503) generated by the current. This repulsive Lorentz force can precisely cancel the electrodynamic repulsion force generated by the short-circuit current, thus achieving the function of short-circuit current protection.

[0040] For details, please refer to the following: Figure 4 and Figure 5 The reed contact assembly 504 includes: a second contact 5041 abutting against the side of the first contact 503; a first movable reed 5042 mounted on the outside of the second contact 5041; a second movable reed 5043 mounted on the side of the first movable reed 5042; an auxiliary movable terminal 5044 abutting against the second movable reed 5043; and an armature reed 40 abutting against the auxiliary movable terminal 5044.

[0041] In this embodiment, the length of the first moving spring 5042 is less than the length of the second moving spring 5043. Both the first moving spring 5042 and the second moving spring 5043 are elastically disposed inside the relay base 20. The auxiliary moving terminal 5044 is elastically disposed inside the injection molded part 5045. The injection molded part 5045 is installed on one side of the top of the intermediate partition 201.

[0042] The power relay with short-circuit current protection of this invention, through the operation of the first contact 503 and the second contact 5041, can drive the first moving spring 5042 and the second moving spring 5043 connected to the second contact 5041 to operate. When the second moving spring 5043 is operating, the auxiliary moving terminal 5044 that abuts against the second moving spring 5043 will operate, contacting or moving away from the armature spring 40 to achieve relay operation.

[0043] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A power relay with short-circuit current protection function, characterized in that... It includes: a relay housing (10); and a relay base (20) installed inside the relay housing (10); A coil assembly (30) is disposed inside one side of the relay base (20) and extends to the bottom of the relay base (20); an armature spring (40) is disposed above the coil assembly (30) and abuts against the armature spring (40); a moving contact structure (50) is disposed on the side of the coil assembly (30) and abuts against the armature spring (40), the moving contact structure (50) extending to the bottom of the relay base (20). The moving contact structure (50) includes: a relay spring (501) installed inside the relay base (20) and extending to the outside of the relay base (20); a relay spring (502) installed on one side of the top of the relay spring (501); a first contact (503) installed on the inner side of the bottom of the relay spring (502); a spring contact assembly (504) disposed on the side of the first contact (503); and an armature spring (40) that abuts against the spring contact assembly (504).

2. A power relay with short-circuit current protection function according to claim 1, characterized in that: The internal space of the relay base (20) is divided into two parts at the center by a middle partition (201). The middle partition (201) is further divided into four parts on the side near the relay spring (501) by multiple side partitions (202). Spring contact assemblies (504) are provided on the sides of the side partitions (202). The top of the intermediate partition (201) is elastically provided with an armature spring (40).

3. A power relay with short-circuit current protection function according to claim 1, characterized in that: The coil assembly (30) has coil leads (301) extending from its bottom. Multiple coil leads (301) are provided, and all of the multiple coil leads (301) extend to the bottom of the relay base (20).

4. A power relay with short-circuit current protection function according to claim 3, characterized in that: The relay spring (502) is bent, and a gap is left between the relay spring (502) and the relay spring (501). The direction of the short-circuit current inside the relay spring (502) is perpendicular to the direction of the Lorentz magnetic force generated by the first contact (503). The relay spring (501) is recessed inward on the side near the bottom of the first contact (503), and the bottom of the relay spring (501) is provided with a stationary foot (5011) extending to the outside of the relay base (20).

5. A power relay with short-circuit current protection function according to claim 2, characterized in that: The reed contact assembly (504) includes: a second contact (5041) abutting against the side of the first contact (503); a first movable reed (5042) mounted on the outside of the second contact (5041); a second movable reed (5043) mounted on the side of the first movable reed (5042); an auxiliary movable terminal (5044) abutting against the second movable reed (5043); and an armature reed (40) abutting against the auxiliary movable terminal (5044).

6. A power relay with short-circuit current protection function according to claim 5, characterized in that: The length of the first movable spring (5042) is less than the length of the second movable spring (5043), and both the first movable spring (5042) and the second movable spring (5043) are elastically disposed inside the relay base (20). The auxiliary moving terminal (5044) is elastically disposed inside the injection molded part (5045), and the injection molded part (5045) is installed on one side of the top of the intermediate partition plate (201).

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