Circuit breaker with prolonged service life of contact

Abstract

The utility model provides a circuit breaker with a prolonged service life of a contact, which belongs to the technical field of electrical engineering and comprises a shell, an arc extinguish chamber is arranged in an inner cavity of the shell, and a positioning substrate is arranged at the top of an inner cavity of the arc extinguish chamber. Through the design of the multi-layer composite material, the arc erosion resistance and the overall performance of the silver contact in high-current or high-voltage application are improved, the composite silver contact serves as the basis, good conductivity and contact performance are provided, the silver-tungsten composite material is arranged on the inner wall of the inner cavity due to the high-temperature resistance and arc resistance characteristics, and therefore the contact performance of the silver-tungsten composite material is improved. The silver-nickel composite material further enhances the wear resistance and the arc resistance of the inner wall and provides an additional protection layer for the contact, the outer surface is coated with the silver-graphite composite coating, and the friction between the contacts and the generation of the arc are reduced by using the lubricity and the high temperature resistance of graphite, so that the contact is protected from being directly eroded by the arc, and the service life of the contact is prolonged. Therefore, evaporation and splashing of silver are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of electrical engineering, and in particular relates to a circuit breaker with extended contact life. Background Art

[0002] In the field of electrical engineering, silver contacts refer to electrical contacts made of silver or silver alloys. They are key components in electrical switches, relays, circuit breakers and other electrical equipment, responsible for establishing or disconnecting connections in circuits. Silver is widely used in contact materials due to its excellent electrical conductivity, thermal conductivity and corrosion resistance. Silver contacts can provide very low contact resistance, which means that when the contacts are closed, the current can pass smoothly without generating excessive heat due to contact resistance. In addition, silver's corrosion resistance means that even in a humid or chemically contaminated environment, silver contacts can maintain their performance and are not easily oxidized or corroded.

[0003] Currently, silver contacts also have their limitations when used. In high current or high voltage applications, silver may wear out quickly due to arc erosion. When the contacts are disconnected, if the current is large enough, an arc will be generated between the contacts. The high temperature and energy of the arc will cause the silver to evaporate and splash quickly, causing rapid wear of the contacts. This arc erosion will reduce the life of the contacts and may cause pits or irregular shapes to form on the contact surface, further affecting the contact performance. Utility Model Content

[0004] The utility model aims to provide a circuit breaker with extended contact life, aiming to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A circuit breaker with extended contact life comprises a shell, an inner cavity of the shell is provided with an arc extinguishing chamber, and a positioning substrate is provided on the top of the inner cavity of the arc extinguishing chamber;

[0007] The positioning substrate comprises a composite silver contact, a silver-tungsten composite material, a silver-nickel composite material and a silver-graphite composite coating. The composite silver contact is fixedly mounted on the front and rear sides of the bottom of the positioning substrate respectively, the silver-tungsten composite material is arranged on the inner wall of the inner cavity of the composite silver contact, the silver-nickel composite material is arranged on the inner wall of the silver-tungsten composite material, and the silver-graphite composite coating is coated on the outer surface of the composite silver contact.

[0008] As a preferred solution of the utility model, a connecting piece is fixedly installed on the rear side of the bottom of the shell, an electromagnetic release is arranged on the bottom of the back of the shell, and grooves are respectively provided on the top and bottom of the inner cavity of the shell.

[0009] As a preferred solution of the utility model, a convex block is fixedly installed on the back side of the inner cavity of the groove, a fastening bolt is arranged on the front side of the convex block, and fixing blocks are respectively arranged on both sides of the surface of the shell.

[0010] As a preferred solution of the utility model, fixing screw holes are provided on both sides of the inner cavity of the shell, the fixing blocks are threadedly connected to the fixing screw holes, and a connecting rod is provided on the front side of the arc extinguishing chamber.

[0011] As a preferred solution of the utility model, an adjustment handle is provided at the center of the front side of the housing, and one end of the adjustment handle is fixedly connected to one end of the connecting rod.

[0012] As a preferred solution of the utility model, a clamping strip is fixedly installed on the top of the back side of the shell, and the thickness of the silver-graphite composite coating is 0.02 mm.

[0013] The beneficial effects of the utility model are:

[0014] The design of multi-layer composite materials aims to improve the arc erosion resistance and overall performance of silver contacts in high current or high voltage applications. The composite silver contact serves as the basis, providing good conductivity and contact performance. The silver-tungsten composite material is arranged on the inner wall of the inner cavity due to its high temperature resistance and arc resistance to protect the silver contacts from direct erosion by the arc. The silver-nickel composite material further enhances the wear resistance and arc resistance of the inner wall, providing an additional protective layer for the contacts. The silver-graphite composite coating is coated on the outer surface, utilizing the lubricity and high temperature resistance of graphite to reduce friction and arc generation between contacts, thereby reducing silver evaporation and splashing, extending the service life of the contacts, and maintaining the smoothness of the contact surface to ensure stable contact performance. This multi-layer protection design can effectively solve the wear problem of silver contacts in a high-energy arc environment and improve the reliability and durability of the contacts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0016] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the utility model;

[0017] Figure 2 It is a partial cross-sectional view of the housing structure provided by an embodiment of the utility model;

[0018] Figure 3It is a partial front view of the housing structure provided by an embodiment of the utility model;

[0019] Figure 4 It is a rear view of the housing structure provided by an embodiment of the utility model;

[0020] Figure 5 It is a partial exploded view of the positioning substrate structure provided by an embodiment of the utility model.

[0021] In the figure: 1. housing; 2. adjustment handle; 3. clamping strip; 4. fixing block; 5. connecting rod; 6. protrusion; 7. fixing screw hole; 8. groove; 9. fastening bolt; 10. positioning substrate; 1001. composite silver contact; 1002. silver-tungsten composite material; 1003. silver-nickel composite material; 1004. silver-graphite composite coating; 11. arc extinguishing chamber; 12. connecting piece; 13. electromagnetic release. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Example

[0025] Reference Figure 1-5 , is an embodiment of the utility model, which provides a circuit breaker with extended contact life, comprising a housing 1, an arc extinguishing chamber 11 is provided in the inner cavity of the housing 1, and a positioning substrate 10 is provided at the top of the inner cavity of the arc extinguishing chamber 11;

[0026] The positioning substrate 10 includes a composite silver contact 1001, a silver-tungsten composite material 1002, a silver-nickel composite material 1003 and a silver-graphite composite coating 1004. The composite silver contact 1001 is fixedly installed on the front and back sides of the bottom of the positioning substrate 10, respectively. The silver-tungsten composite material 1002 is arranged on the inner wall of the inner cavity of the composite silver contact 1001, the silver-nickel composite material 1003 is arranged on the inner wall of the silver-tungsten composite material 1002, and the silver-graphite composite coating 1004 is coated on the outer surface of the composite silver contact 1001.

[0027] Specifically, a connecting piece 12 is fixedly mounted on the rear side of the bottom of the housing 1 , an electromagnetic release 13 is arranged on the bottom of the back of the housing 1 , and grooves 8 are respectively provided on the top and bottom of the inner cavity of the housing 1 .

[0028] Furthermore, the electromagnetic release 13 provides overcurrent protection. When the current in the circuit exceeds a predetermined value, the electromagnetic coil in the electromagnetic release 13 will generate sufficient magnetic force to quickly attract the tripping mechanism, causing the circuit breaker to trip, thereby cutting off the circuit and preventing electrical equipment from being damaged due to overload or short circuit, thereby protecting the safety of personnel and equipment. The electromagnetic release 13 acts quickly and usually responds within a few milliseconds. It is particularly suitable for situations where the circuit needs to be disconnected quickly to prevent serious damage.

[0029] Specifically, a protrusion 6 is fixedly installed on the back of the inner cavity of the groove 8, a fastening bolt 9 is arranged on the front of the protrusion 6, and fixing blocks 4 are respectively arranged on both sides of the surface of the shell 1.

[0030] Furthermore, the fastening bolts 9 are used to fix the protrusions 6 .

[0031] Specifically, fixing screw holes 7 are provided on both sides of the inner cavity of the housing 1 , the fixing blocks 4 are threadedly connected to the fixing screw holes 7 , and a connecting rod 5 is provided on the front side of the arc extinguishing chamber 11 .

[0032] Furthermore, the fixing block 4 is threadedly connected to the fixing screw hole 7 to connect the entire housing 1 .

[0033] Specifically, an adjustment handle 2 is provided at the center of the front side of the housing 1 , and one end of the adjustment handle 2 is fixedly connected to one end of the connecting rod 5 .

[0034] Furthermore, the adjustment handle 2 is responsible for operating the contact system under manual or automatic control.

[0035] Specifically, a clamping strip 3 is fixedly mounted on the top of the back side of the housing 1 , and the thickness of the silver-graphite composite coating 1004 is 0.02 mm.

[0036] Furthermore, the card strip 3 is used to connect and fix with the peripheral structure.

[0037] Working principle: The contact system can be operated under manual control by adjusting the handle 2. The clamping strip 3 is used to connect and fix with the peripheral structure to realize the installation of the shell 1 as a whole. The fixing block 4 is threadedly connected with the fixing screw hole 7 to connect the shell 1 as a whole. The composite silver contact 1001 is used as the basis to provide good conductivity and contact performance. The silver-tungsten composite material 1002 is arranged on the inner wall of the inner cavity due to its high temperature resistance and arc resistance to protect the silver contact from direct erosion by the arc. The silver-nickel composite material 1003 further enhances the wear resistance and arc resistance of the inner wall and provides an additional protective layer for the contact. The silver-graphite composite coating 1004 is coated on the surface. The surface of the electromagnetic release 13 provides over-current protection. When the current in the circuit exceeds a predetermined value, the electromagnetic coil in the electromagnetic release 13 will generate sufficient magnetic force to quickly attract the tripping mechanism, causing the circuit breaker to trip, thereby cutting off the circuit and preventing electrical equipment from being damaged due to overload or short circuit, thereby protecting personnel and equipment. The electromagnetic release 13 acts quickly and usually responds within a few milliseconds. It is particularly suitable for situations where the circuit needs to be disconnected quickly to prevent serious damage.

[0038] In summary, the overall beneficial effects of the embodiment are as follows: through the design of the multi-layer composite material, the arc erosion resistance and overall performance of the silver contact in high current or high voltage applications are improved. The composite silver contact 1001 is used as a basis to provide good conductivity and contact performance. The silver-tungsten composite material 1002 is arranged on the inner wall of the inner cavity due to its high temperature resistance and arc resistance to protect the silver contact from direct erosion by the arc. The silver-nickel composite material 1003 further enhances the wear resistance and arc resistance of the inner wall, providing an additional protective layer for the contact. The silver-graphite composite coating 1004 is coated on the outer surface, and the lubricity and high temperature resistance of graphite are used to reduce the friction and arc generation between the contacts, thereby reducing the evaporation and splashing of silver, extending the service life of the contact, and maintaining the flatness of the contact surface to ensure the stability of the contact performance. Through this multi-layer protection design, the wear problem of the silver contact in a high-energy arc environment can be effectively solved, and the reliability and durability of the contact can be improved.

Claims

1. A circuit breaker with extended contact life, characterized in that: It comprises a housing (1), the inner cavity of the housing (1) being provided with an arc extinguishing chamber (11), and the top of the inner cavity of the arc extinguishing chamber (11) being provided with a positioning substrate (10); The positioning substrate (10) comprises a composite silver contact (1001), a silver-tungsten composite material (1002), a silver-nickel composite material (1003) and a silver-graphite composite coating (1004); the composite silver contact (1001) is fixedly mounted on the front and rear sides of the bottom of the positioning substrate (10), respectively; the silver-tungsten composite material (1002) is arranged on the inner wall of the inner cavity of the composite silver contact (1001); the silver-nickel composite material (1003) is arranged on the inner wall of the silver-tungsten composite material (1002); and the silver-graphite composite coating (1004) is coated on the outer surface of the composite silver contact (1001).

2. A circuit breaker with extended contact life according to claim 1, characterized in that: A connecting piece (12) is fixedly mounted on the rear side of the bottom of the shell (1), an electromagnetic release (13) is arranged at the bottom of the back side of the shell (1), and grooves (8) are respectively provided at the top and bottom of the inner cavity of the shell (1).

3. A circuit breaker with extended contact life according to claim 2, characterized in that: A protrusion (6) is fixedly mounted on the back of the inner cavity of the groove (8), a fastening bolt (9) is provided on the front of the protrusion (6), and fixing blocks (4) are respectively provided on both sides of the surface of the housing (1).

4. A circuit breaker with extended contact life according to claim 3, characterized in that: Fixing screw holes (7) are provided on both sides of the inner cavity of the housing (1), the fixing blocks (4) are threadedly connected to the fixing screw holes (7), and a connecting rod (5) is provided on the front side of the arc extinguishing chamber (11).

5. A circuit breaker with extended contact life according to claim 4, characterized in that: An adjustment handle (2) is provided at the centre of the front face of the housing (1), and one end of the adjustment handle (2) is fixedly connected to one end of a connecting rod (5).

6. A circuit breaker with extended contact life according to claim 1, characterized in that: A clamping strip (3) is fixedly mounted on the top of the back side of the housing (1), and the thickness of the silver-graphite composite coating (1004) is 0.02 mm.

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