Static contact mounting structure

Abstract

The utility model relates to the technical field of circuit breaker accessory installation, in particular to a static contact installation structure which comprises a circuit breaker base, the top end of the circuit breaker base is in bolted connection with an upper shell, and the interior of the upper shell is rotationally connected with a switching mechanism through a bolt. The top end of the circuit breaker base is slidably connected with a plurality of first static contacts and second static contacts and penetrates into the circuit breaker base, and the top end of the circuit breaker base is mechanically connected with a mounting mechanism and penetrates into the circuit breaker base. According to the utility model, switching connection between the first static contact and the second static contact by the moving contact can be completed through mutual cooperation of internal parts of the switching mechanism, and rapid disassembly and replacement of the first static contact and the second static contact on the circuit breaker base can be completed through mutual cooperation of internal parts of the installation mechanism. And the replacement cost of the static contact on the circuit breaker base is reduced.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker accessory installation technology, specifically to a stationary contact installation structure. Background Technology

[0002] Molded case circuit breakers (MCCBs) are widely used in the new energy industry, factories, buildings, and homes. They reliably protect circuits and power equipment from damage during infrequent switching and motor starting. With the development of new energy technologies, higher demands are being placed on low-voltage electrical components. In particular, with the continuous growth of photovoltaic power plants, the performance requirements for the protection components needed by these plants have also become more stringent.

[0003] A search revealed a utility model patent with publication number CN206921758U, which discloses a circuit breaker stationary contact mounting structure. This structure includes a base and a stationary contact. The key feature is that a magnetic block is installed inside the base, the contact end of the stationary contact is mounted on the magnetic block, and the magnetic block supports the contact end of the stationary contact. A base is mounted on the back of the base, supporting the magnetic block and the contact end of the stationary contact. The mounting end of the stationary contact is mounted on the outside of the back of the base. This utility model mounts the circuit breaker contact on the outside of the back of the base, while utilizing a magnetic block to support the stationary contact, reducing the installation difficulty of the stationary contact, saving production costs, and extending the service life of the circuit breaker.

[0004] While the aforementioned patent reduces the installation difficulty of the stationary contact by mounting the circuit breaker contact on the outside of the back of the base and using a magnetic block to support the stationary contact, thus saving production costs and extending the service life of the circuit breaker, the stationary contact plate at the top of the circuit breaker base commonly found on the market has a protruding stationary contact. The stationary contact plate is generally fixed to the base with bolts, and its surface is prone to rust due to moisture corrosion during long-term use, affecting the contact between the stationary contact and the moving contact. This results in the entire stationary contact plate being disassembled and replaced when replacing the stationary contact, making the disassembly and replacement of the stationary contact plate more cumbersome. Furthermore, the disassembly and replacement of the entire stationary contact plate increases the cost and time of circuit breaker base maintenance.

[0005] Therefore, it is necessary to propose a static contact mounting structure to solve the above problems. Utility Model Content

[0006] The purpose of this utility model is to provide a stationary contact mounting structure. Through the cooperation of the internal parts of the switching mechanism, the switching connection between the moving contact and stationary contacts No. 1 and No. 2 can be completed. Through the cooperation of the internal parts of the mounting mechanism, the stationary contacts No. 1 and No. 2 can be quickly disassembled and replaced on the circuit breaker base, and the replacement cost of the stationary contact piece on the circuit breaker base can be reduced. This solves the problem in the prior art where the surface of the stationary contact is prone to rust due to water vapor corrosion during long-term use, which affects the contact between the stationary contact and the moving contact. As a result, when replacing the stationary contact, the entire stationary contact piece needs to be disassembled and replaced, which makes the disassembly and replacement of the stationary contact piece more cumbersome and increases the cost and time of circuit breaker base maintenance.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a static contact mounting structure, including a circuit breaker base, an upper housing bolted to the top of the circuit breaker base, a switching mechanism rotatably connected to the interior of the upper housing via bolts, and an installation mechanism mechanically connected to the top of the circuit breaker base, extending through the interior of the circuit breaker base.

[0008] The switching mechanism includes a drive motor, which is bolted inside the upper housing. The output end of the drive motor is rotatably connected to a main shaft via a coupling. A support shaft is bolted to the outer wall of the main shaft. Connecting brackets are mechanically connected to both sides of the top of the outer wall of the support shaft. A moving contact is mechanically connected to the bottom of the connecting bracket. Multiple stationary contacts No. 1 and No. 2 are slidably connected to the top of the circuit breaker base, extending into the interior of the circuit breaker base and located below the moving contact.

[0009] The installation mechanism includes multiple fixing bolts, which are threaded together and fixed to the top of the circuit breaker base. Arc-shaped spring pieces are mechanically connected to both sides of the outer walls of the first and second stationary contacts, and a miniature spring is mechanically connected between the arc-shaped spring pieces and the outer wall of the second stationary contact. A pressing block is slidably connected inside the circuit breaker base, located on both sides of the first and second stationary contacts and in contact with the outer wall of the arc-shaped spring pieces. A return spring is mechanically connected between the pressing block and the inside of the circuit breaker base.

[0010] Preferably, the mounting mechanism further includes a C-shaped block, which is slidably connected to the inside of the circuit breaker base and located below the compression block. The bottom end of the C-shaped block is mechanically connected to the inside of the circuit breaker base by a support spring. A connecting column is mechanically connected to the side of the C-shaped block near the fixing bolt and is located directly below the fixing bolt.

[0011] Preferably, the surface of the circuit breaker base is fitted with stationary contact pieces by fixing bolts, and these contact pieces are sleeved on the outer walls of the first and second stationary contacts.

[0012] Preferably, the upper housing has a switching space inside that matches the connecting bracket, and the top of the circuit breaker base and the surface of the stationary contact piece have mating holes that match the first stationary contact and the second stationary contact.

[0013] Preferably, the top of the circuit breaker base and the surface of the stationary contact piece are provided with threaded holes that match the fixing bolts, the inside of the circuit breaker base is provided with a limiting groove that matches the arc-shaped spring piece, and the inside of the circuit breaker base is provided with a support groove that matches the C-shaped block and the connecting column.

[0014] Preferably, the circuit breaker base has a sliding groove inside that matches the compression block, the bottom end of the compression block and the top end of the C-shaped block are both set as conical surfaces, and the elastic coefficient of the support spring is greater than that of the micro spring.

[0015] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0016] The drive motor inside the upper housing facilitates the rotation of the main shaft when a short circuit occurs inside the circuit breaker base or when power switching is required. The rotation of the main shaft drives the rotation of the support shaft, which in turn drives the rotation of the connecting bracket. The rotation of the connecting bracket drives the rotation of the moving contacts on both sides, allowing the moving contacts to complete the connection switching between the first stationary contact and the second stationary contact. This ensures circuit stability and circuit breaker protection, and improves the safety of the equipment.

[0017] The stationary contact piece can be installed and fixed on the circuit breaker base using fixing bolts. At the same time, the first and second stationary contacts are inserted into the stationary contact piece and the circuit breaker base through the arc-shaped spring pieces on both sides of the outer wall, so that the first and second stationary contacts are connected to the surface of the stationary contact piece and the inside of the circuit breaker base. Meanwhile, the fixing bolts penetrate into the inside of the circuit breaker base and contact and press with the connecting column, causing the connecting column to compress and move the support spring. This causes the connecting column to drive the C-shaped block to release the contact and compression of the compression block. Under the push of the return spring, the compression block moves out of the limiting groove inside the circuit breaker base, thus fixing the first and second stationary contacts inside the circuit breaker base with the arc-shaped spring pieces. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2This is an exploded structural diagram of the circuit breaker base and upper housing of this utility model;

[0021] Figure 3 This is a cross-sectional structural diagram of the circuit breaker base of this utility model;

[0022] Figure 4 This is a schematic diagram of the structure of the first stationary contact and the second stationary contact of this utility model;

[0023] Figure 5 For the present utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. Circuit breaker base; 101. Upper housing; 2. Switching mechanism; 201. Drive motor; 202. Main shaft; 203. Support shaft; 204. Connecting bracket; 205. Moving contact; 206. Stationary contact No. 1; 207. Stationary contact No. 2; 3. Mounting mechanism; 301. Fixing bolt; 302. Pressing block; 303. Return spring; 304. C-shaped block; 305. Arc-shaped spring; 306. Miniature spring; 307. Support spring; 308. Connecting column. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0027] This utility model provides, for example Figure 1-5 The static contact mounting structure shown includes a circuit breaker base 1, an upper housing 101 bolted to the top of the circuit breaker base 1, a switching mechanism 2 rotatably connected to the interior of the upper housing 101 by bolts, and a mounting mechanism 3 mechanically connected to the top of the circuit breaker base 1 and extending into the interior of the circuit breaker base 1.

[0028] The switching mechanism 2 includes a drive motor 201, which is bolted to the inside of the upper housing 101. The output end of the drive motor 201 is rotatably connected to a main shaft 202 via a coupling. The outer wall of the main shaft 202 is bolted to a support shaft 203. The top two sides of the outer wall of the support shaft 203 are mechanically connected to connecting brackets 204. The bottom end of the connecting brackets 204 is mechanically connected to a moving contact 205. The top of the circuit breaker base 1 is slidably connected to multiple first stationary contacts 206 and second stationary contacts 207, which penetrate into the interior of the circuit breaker base 1 and are located below the moving contact 205.

[0029] The mounting mechanism 3 includes multiple fixing bolts 301, which are fixed to the top of the circuit breaker base 1 by threaded connection. Arc-shaped spring pieces 305 are mechanically connected to both sides of the outer wall of the first stationary contact 206 and the second stationary contact 207. A miniature spring 306 is mechanically connected between the arc-shaped spring piece 305 and the outer wall of the second stationary contact 207. A pressing block 302 is slidably connected inside the circuit breaker base 1 and is located on both sides of the first stationary contact 206 and the second stationary contact 207, and is in contact with the outer wall of the arc-shaped spring piece 305. A return spring 303 is mechanically connected between the pressing block 302 and the inside of the circuit breaker base 1.

[0030] By cooperating with each other among the internal parts of the switching mechanism 2, the switching connection between the moving contact 205 and the first stationary contact 206 and the second stationary contact 207 can be completed. By cooperating with each other among the internal parts of the mounting mechanism 3, the first stationary contact 206 and the second stationary contact 207 can be quickly disassembled and replaced on the circuit breaker base 1, thereby reducing the replacement cost of the stationary contact pieces on the circuit breaker base 1.

[0031] Refer to the instruction manual appendix Figure 1-5 The mounting mechanism 3 also includes a C-shaped block 304, which is slidably connected to the inside of the circuit breaker base 1 and located below the pressing block 302. The bottom end of the C-shaped block 304 is mechanically connected to the inside of the circuit breaker base 1 by a support spring 307. The side of the C-shaped block 304 near the fixing bolt 301 is mechanically connected to a connecting column 308 and located directly below the fixing bolt 301. Through the mutual cooperation between the internal parts of the mounting mechanism 3, the connecting column 308 can be pressed by the support spring 307 to drive the C-shaped block 304 to move.

[0032] Refer to the instruction manual appendix Figure 1-5 A stationary contact piece is installed on the surface of the circuit breaker base 1 by fixing bolts 301, and is sleeved with the outer wall of the first stationary contact 206 and the second stationary contact 207. The stationary contact piece is installed on the surface of the circuit breaker base 1 by fixing bolts 301, and is sleeved with the outer wall of the first stationary contact 206 and the second stationary contact 207, so that the first stationary contact 206 and the second stationary contact 207 can be installed and fixed on the surface of the stationary contact piece.

[0033] Refer to the instruction manual appendix Figure 1-5 The upper housing 101 has a switching space inside that matches the connecting bracket 204. The top of the circuit breaker base 1 and the surface of the stationary contact piece are provided with mating holes that match the first stationary contact 206 and the second stationary contact 207. The switching space inside the upper housing 101 that matches the connecting bracket 204 facilitates the rotation of the main shaft 202, which in turn drives the connecting bracket 204 to rotate via the rotation of the support shaft 203, and connects with the first stationary contact 206 and the second stationary contact 207 for switching.

[0034] Refer to the instruction manual appendix Figure 1-5 The top of the circuit breaker base 1 and the surface of the stationary contact are provided with threaded holes that match the fixing bolts 301. The inside of the circuit breaker base 1 is provided with a limiting groove that matches the arc-shaped spring piece 305. The inside of the circuit breaker base 1 is provided with a support groove that matches the C-shaped block 304 and the connecting column 308. The limiting groove inside the circuit breaker base 1 that matches the arc-shaped spring piece 305 facilitates the sliding of the first stationary contact 206 and the second stationary contact 207 into the inside of the circuit breaker base 1 through the arc-shaped spring piece 305, thus completing the installation and fixing of the first stationary contact 206 and the second stationary contact 207 on the circuit breaker base 1.

[0035] Refer to the instruction manual appendix Figure 1-5 The circuit breaker base 1 has a sliding groove inside that matches the compression block 302. The bottom end of the compression block 302 and the top end of the C-shaped block 304 are both set as conical surfaces. The elastic coefficient of the support spring 307 is greater than that of the miniature spring 306. The circuit breaker base 1 has a sliding groove inside that matches the compression block 302. The bottom end of the compression block 302 and the top end of the C-shaped block 304 are both set as conical surfaces, which facilitates the movement of the C-shaped block 304 and pushes the compression block 302 to move through the conical surface.

[0036] The working principle of this practical application is as follows:

[0037] Refer to the instruction manual appendix Figure 1-5 The drive motor 201 inside the upper housing 101 facilitates the rotation of the main shaft 202 when a short circuit occurs inside the circuit breaker base 1 or when power switching is required. The rotation of the main shaft 202 drives the support shaft 203 to rotate, which in turn drives the connecting bracket 204 to rotate. The rotation of the connecting bracket 204 drives the moving contacts 205 on both sides to rotate, so that the moving contacts 205 can complete the connection switching between the first stationary contact 206 and the second stationary contact 207. This ensures the stability of the circuit and circuit breaker protection, and improves the safety of the equipment.

[0038] Refer to the instruction manual appendix Figure 1-5The stationary contact piece can be fixed to the circuit breaker base 1 by fixing bolt 301. Simultaneously, stationary contact 206 and stationary contact 207 are inserted into the stationary contact piece and circuit breaker base 1 through the arc-shaped spring pieces 305 on both sides of the outer wall, connecting stationary contact 206 and stationary contact 207 to the surface of the stationary contact piece and the interior of the circuit breaker base 1. At the same time, fixing bolt 301 penetrates into the interior of the circuit breaker base 1 and contacts and presses against connecting post 308, causing connecting post 308 to compress and move the support spring 307. This causes connecting post 308 to move C-shaped block 304 to release the contact and compression of compression block 302, allowing compression block 302 to move out of the limiting groove inside the circuit breaker base 1 under the push of return spring 303. This allows the stationary contact 206 to be installed. The first stationary contact 206 and the second stationary contact 207 are fixed inside the circuit breaker base 1 by the arc-shaped spring piece 305. Loosening the fixing bolt 301 releases the pressure of the fixing bolt 301 on the connecting column 308, causing the support spring 307 to reset and push the C-shaped block 304 to press the compression block 302. The compression block 302 is forced to compress the reset spring 303 and move, causing the compression block 302 to move and push the arc-shaped spring piece 305 to compress the miniature spring 306 and move, causing the arc-shaped spring piece 305 to deform and move out of the limiting groove, thus releasing the connection and fixation of the first stationary contact 206 and the second stationary contact 207 to the circuit breaker base 1. This makes it easier for the staff to quickly disassemble and replace the first stationary contact 206 and the second stationary contact 207 with rust on the surface.

[0039] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A stationary contact mounting structure, characterized by: The circuit breaker base (1) is bolted to the top of the circuit breaker base (1), and a switching mechanism (2) is rotatably connected to the inside of the upper housing (101) by bolts. An installation mechanism (3) is mechanically connected to the top of the circuit breaker base (1) and extends into the inside of the circuit breaker base (1). The switching mechanism (2) includes a drive motor (201), which is bolted to the inside of the upper housing (101). The output end of the drive motor (201) is rotatably connected to a main shaft (202) via a coupling. The outer wall of the main shaft (202) is bolted to a support shaft (203). The top two sides of the outer wall of the support shaft (203) are mechanically connected to connecting brackets (204). The bottom end of the connecting brackets (204) is mechanically connected to a moving contact (205). The top of the circuit breaker base (1) is slidably connected to multiple first stationary contacts (206) and second stationary contacts (207), which penetrate into the inside of the circuit breaker base (1) and are located below the moving contact (205). The installation mechanism (3) includes multiple fixing bolts (301), which are fixed to the top of the circuit breaker base (1) by threaded connection. The outer walls of the first stationary contact (206) and the second stationary contact (207) are mechanically connected to arc-shaped spring pieces (305), and a miniature spring (306) is mechanically connected between the arc-shaped spring pieces (305) and the outer wall of the second stationary contact (207). A pressing block (302) is slidably connected inside the circuit breaker base (1), and is located on both sides of the first stationary contact (206) and the second stationary contact (207), and is in contact with the outer wall of the arc-shaped spring pieces (305). A return spring (303) is mechanically connected between the pressing block (302) and the inside of the circuit breaker base (1).

2. A stationary contact mounting structure according to claim 1, characterized in that: The installation mechanism (3) also includes a C-shaped block (304), which is slidably connected to the inside of the circuit breaker base (1) and located below the compression block (302). The bottom end of the C-shaped block (304) is mechanically connected to the inside of the circuit breaker base (1) by a support spring (307). The side of the C-shaped block (304) near the fixing bolt (301) is mechanically connected to a connecting column (308) and located directly below the fixing bolt (301).

3. A stationary contact mounting structure according to claim 1, characterized in that: The surface of the circuit breaker base (1) is fitted with stationary contact pieces by fixing bolts (301), and these contact pieces are sleeved with the outer walls of the first stationary contact (206) and the second stationary contact (207).

4. A stationary contact mounting structure according to claim 1, characterized in that: The upper housing (101) has a switching space inside that matches the connecting bracket (204), and the top of the circuit breaker base (1) and the surface of the stationary contact piece are provided with mating holes that match the first stationary contact (206) and the second stationary contact (207).

5. A stationary contact mounting structure according to claim 2, characterized in that: The top of the circuit breaker base (1) and the surface of the stationary contact piece are provided with threaded holes that match the fixing bolt (301). The inside of the circuit breaker base (1) is provided with a limiting groove that matches the arc-shaped spring piece (305). The inside of the circuit breaker base (1) is provided with a support groove that matches the C-shaped block (304) and the connecting column (308).

6. A stationary contact mounting structure according to claim 2, characterized in that: The circuit breaker base (1) has a sliding groove inside that matches the compression block (302). The bottom end of the compression block (302) and the top end of the C-shaped block (304) are both set as conical surfaces. The elastic coefficient of the support spring (307) is greater than that of the micro spring (306).

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