Connecting structure for static contact of circuit breaker

Abstract

The utility model relates to the technical field of electrical equipment, and discloses a connecting structure for a static contact of a circuit breaker, the connecting structure is applied to the circuit breaker provided with the static contact and a circuit board, the static contact is provided with a plug port, the connecting structure comprises a connecting bolt connected between the static contact and the circuit board, the connecting bolt has conductivity, and the plug port is connected with the connecting bolt. The circuit board is provided with a conductive hole for the connection bolt to pass through, and the inner wall of the plugging port is provided with a connection thread matched with the thread of the connection bolt. The circuit board and the static contact are connected through the connecting bolt, the connecting stability of the circuit board and the static contact is improved, and normal work of the circuit breaker is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and in particular to a connection structure for stationary contacts of a circuit breaker. Background Technology

[0002] A circuit breaker consists of stationary contacts and moving contacts. When an overload is detected in the circuit, the moving contact separates from the stationary contact, thereby quickly cutting off the circuit, preventing equipment from operating under overload, and protecting electrical equipment from damage.

[0003] In related technologies, patent CN220984449U discloses a circuit breaker, including a mounting shell, a base, and a detachable top cover mounted on the top of the base. The base and the top cover form a first receiving space. The bottom plate of the base is recessed towards the first receiving space to form a mounting groove, and a power extraction hole is provided on the bottom plate. A stationary contact is located in the first receiving space. A circuit board is located in the mounting groove and has a conductive hole. A conductive post is inserted into the conductive hole. A part of the conductive post enters the first receiving space through the power extraction hole and contacts the stationary contact, so that the circuit board and the stationary contact are electrically connected through the conductive post. The stationary contact is provided with a plug-in interface, and the conductive post passes through the plug-in interface to contact the stationary contact through the plug-in interface.

[0004] However, when the stationary contact of the circuit breaker is connected to the circuit board through the conductive post, the conductive post is prone to loose insertion, resulting in poor contact between the stationary contact and the circuit board, which affects the normal operation of the circuit breaker. Therefore, this issue needs to be addressed. Utility Model Content

[0005] To ensure the normal operation of the circuit breaker, this application provides a connection structure for the stationary contacts of the circuit breaker.

[0006] The technical solution provided in this application for a connection structure for stationary contacts of a circuit breaker is as follows:

[0007] A connection structure for a stationary contact of a circuit breaker is provided, applicable to a circuit breaker having a stationary contact and a circuit board. The stationary contact has a plug-in interface, including a connecting bolt connecting the stationary contact and the circuit board. The connecting bolt is conductive. The circuit board has a conductive hole for the connecting bolt to pass through. The inner wall of the plug-in interface has a connecting thread that mates with the thread of the connecting bolt.

[0008] By adopting the above technical solution, when connecting the circuit board and the stationary contact, the connecting bolt is first inserted into the conductive hole, and then the connecting bolt is threaded into the plug interface. This achieves the connection between the circuit board and the stationary contact, which is convenient to operate and ensures a firm connection between the connecting bolt and the circuit board and the stationary contact. Compared to connecting the circuit board and the stationary contact via conductive post plugging, the bolt connection enhances the connection strength between the circuit board and the stationary contact, thereby reducing the possibility of poor contact between the circuit board and the stationary contact, which is beneficial to ensuring the normal operation of the circuit breaker and is also convenient to install.

[0009] Optionally, the connecting bolt includes a screw and a bolt head, and a washer is fitted on the screw. The diameter of the washer is larger than the diameter of the bolt head. When the connecting bolt is connected to the stationary contact, the washer is located between the circuit board and the bolt head.

[0010] By adopting the above technical solution, when the connecting bolt is connected to the stationary contact, the washer abuts against the bolt head and the circuit board, increasing the contact area between them. This increases the friction between the circuit board and the bolt head, resulting in high connection stability between the connecting bolt and the circuit board and reducing the possibility of the connecting bolt loosening during vibration. In addition, the washer can also distribute the pressure of the bolt head on the circuit board, thus protecting the circuit board.

[0011] Optionally, it also includes a conductive ring connecting the stationary contact and the circuit board. The conductive ring passes through the conductive hole and the insertion interface. The conductive ring is a hollow cylinder. The inner wall of the conductive ring is provided with an installation thread that mates with the threaded connection of the connecting bolt. The inner wall of the insertion interface away from the circuit board is provided with an installation groove. The groove wall is provided with a fixing thread that mates with the threaded connection of the connecting bolt.

[0012] By adopting the above technical solution, when connecting the circuit board and the stationary contact, first place the conductive ring between the conductive hole and the connector, then pass the connecting bolt through and tighten it in the conductive hole, conductive ring, and connector, and finally tighten the connecting bolt to connect the circuit board and the stationary contact. This method of connecting the circuit board and the stationary contact ensures a firm connection between them, and the hollow design of the conductive ring helps to save resources.

[0013] Optionally, a clearance groove is provided on the groove wall of the mounting groove away from the insertion interface. The width of the clearance groove is greater than the width of the mounting groove in the direction perpendicular to the direction in which the connecting bolt extends into the mounting groove. A limiting component is provided at the end of the connecting bolt away from its bolt head. The limiting component is used to limit the connecting bolt within the mounting groove.

[0014] By adopting the above technical solution, when the connecting bolt is threaded into the mounting slot, the end of the screw away from the bolt head will extend into the relief groove. At this time, the limiting component can limit the screw in the relief groove, so that the position of the connecting bolt is fixed relative to the mounting slot, thereby fixing the connecting bolt in the socket. Even if vibration occurs, the connecting bolt is not easy to loosen and move out of the socket, ensuring the stability of the connection between the circuit board and the stationary contact.

[0015] Optionally, the limiting assembly includes two limiting blocks slidably disposed on the screw and an elastic element disposed between the two limiting blocks. The screw has a limiting groove, the two limiting blocks are disposed in the limiting groove, and limiting holes are formed on the opposite sidewalls of the two limiting blocks. Connecting grooves are formed on the two opposite groove walls of the limiting groove. A connecting rod is provided in both the two connecting grooves and the two limiting holes. The two limiting blocks are slidably disposed on the connecting rod. The elastic element can drive the two limiting blocks to move away from each other. When the limiting blocks extend into the clearance groove, the maximum distance between the two limiting blocks is greater than the width of the mounting groove along the direction perpendicular to the direction in which the connecting bolt extends into the mounting groove.

[0016] By adopting the above technical solution, when the connecting bolt is threaded into the mounting groove, the two limiting blocks will extend into the relief groove, and the two limiting blocks will slide on the connecting rod under the action of the elastic element and move away from each other. Since the maximum distance between the two limiting blocks is greater than the diameter of the mounting groove, the limiting blocks will be intercepted by the groove wall of the relief groove and kept in the relief groove. The limiting blocks are also fixed on the screw by the connecting rod, so the connecting bolt is not easy to loosen and move out of the mounting groove, and the stability of the connecting bolt is high.

[0017] Optionally, the elastic element includes a return spring sleeved on the connecting rod, with both ends of the return spring abutting against the sidewalls of different limiting blocks.

[0018] By adopting the above technical solution, when the connecting bolt is inserted into the mounting groove, the two limiting blocks will be pressed by the groove wall of the mounting groove and move towards each other. When the limiting blocks are inserted into the relief groove, the two limiting blocks will be pushed by the return spring and move away from each other, so that the limiting blocks abut against the groove wall of the limiting groove. When the connecting bolt is threaded into the mounting groove, the limiting blocks will abut against the groove wall of the relief groove, thereby preventing the screw from moving out of the relief groove and improving the stability of the connecting bolt.

[0019] Optionally, the ends of the two limiting blocks away from the screw are provided with guide ramps.

[0020] By adopting the above technical solution, when the connecting bolt is inserted into the conductive ring, as the screw is screwed into the conductive ring, the guide slope will abut against the inner wall of the conductive ring. The inner wall of the conductive ring will push the two limiting blocks closer to each other, so that the maximum distance between the two limiting blocks is less than the diameter of the screw. This way, the limiting blocks will not obstruct the screw from entering the conductive ring and the mounting groove, and the limiting blocks do not need to be manually pushed, which facilitates the installation of the connecting bolt.

[0021] Optionally, each of the two limiting blocks has a fixing groove on the side closest to each other, and one end of the reset spring is set in one of the fixing grooves and the other end is set in the other fixing groove.

[0022] By adopting the above technical solution, when the reset spring extends or retracts, since both ends of the reset spring are fixed in the fixed groove, the reset spring is not easy to slide relative to the limit block, thereby making the pushing effect of the reset spring on the limit block stable and the limiting effect of the limit block good.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By replacing conductive posts with connecting bolts to connect the circuit board and the stationary contact, the stability of the connection between the circuit board and the stationary contact is improved, the risk of poor contact between the stationary contact and the circuit board is reduced, and the normal operation of the circuit breaker is ensured.

[0025] 2. By passing the connecting bolt through the conductive hole and then threading it with the conductive ring and the mounting slot on the stationary contact, the connection strength between the circuit board and the stationary contact is high.

[0026] 3. A limiting component is provided on the threaded rod of the connecting bolt. The limiting component further improves the stability of the connection between the circuit board and the stationary contact and reduces the risk of the connecting bolt loosening during vibration. Attached Figure Description

[0027] Figure 1 This is an overall structural diagram of Embodiment 1 of this application.

[0028] Figure 2 This is a cross-sectional schematic diagram of Embodiment 1 of this application.

[0029] Figure 3 This is an overall structural diagram of Embodiment 2 of this application.

[0030] Figure 4 This is a cross-sectional schematic diagram of Embodiment 2 of this application.

[0031] Figure 5 yes Figure 4 Enlarged view of point A in the middle.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Stationary contact; 11. Socket; 111. Connecting thread; 13. Mounting groove; 131. Fixing thread; 14. Clearance groove; 2. Circuit board; 21. Conductive hole; 3. Connecting bolt; 4. Washer; 5. Conductive ring; 51. Mounting thread; 6. Limiting assembly; 61. Limiting block; 611. Fixing groove; 612. Limiting hole; 613. Guide slope; 62. Elastic element; 621. Return spring; 63. Limiting groove; 631. Connecting groove; 64. Connecting rod. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0035] This application discloses a connection structure for the stationary contacts of a circuit breaker.

[0036] Example 1

[0037] Reference Figure 1 and Figure 2 A connection structure for a circuit breaker stationary contact is disclosed, applicable to a circuit breaker having a stationary contact 1 and a circuit board 2. The structure includes a connecting bolt 3 connecting the stationary contact 1 and the circuit board 2. The connecting bolt 3 includes a threaded rod and a bolt head. The connecting bolt 3 is conductive. A conductive hole 21 is provided on the circuit board 2, and a insertion interface 11 is provided on the stationary contact 1. The connecting bolt 3 is disposed in the conductive hole 21 and the insertion interface 11. The inner wall of the insertion interface 11 has connecting threads 111 that engage with the threaded connection of the connecting bolt 3. When the connecting bolt 3 is installed in the conductive hole 21 and the insertion interface 11, the plane of the bolt head near the threaded rod remains parallel to the surface of the circuit board 2, ensuring good contact between the connecting bolt 3 and the circuit board 2.

[0038] The implementation principle of a connection structure for a circuit breaker stationary contact according to an embodiment of this application is as follows: When it is necessary to connect the stationary contact 1 and the circuit board 2, the connecting bolt 3 is first inserted into the conductive hole 21, and then the connecting bolt 3 is threaded into the plug interface 11, so that the circuit board 2 is electrically connected to the stationary contact 1 through the connecting bolt 3. Compared with the connection method using conductive post plugs, the connection strength between the stationary contact 1 and the circuit board 2 is higher by connecting the stationary contact 1 and the circuit board 2 in the above manner, ensuring the normal operation of the circuit breaker.

[0039] Example 2

[0040] Reference Figure 3 and Figure 4 The difference between this embodiment and embodiment 1 is that a washer 4 with a diameter larger than the bolt head is fitted on the screw of the connecting bolt 3, and the washer 4 is located between the bolt head and the circuit board 2.

[0041] Reference Figure 5The connection structure for the stationary contact of the circuit breaker also includes a conductive ring 5 connected between the stationary contact 1 and the circuit board 2. The conductive ring 5 is a hollow cylinder. The inner wall of the conductive ring 5 is provided with an installation thread 51 that engages with the threaded connection of the connecting bolt 3. The inner wall of the insertion interface 11 away from the circuit board 2 is provided with an installation groove 13. The groove wall of the installation groove 13 is provided with a fixing thread 131 that engages with the threaded connection of the connecting bolt 3. The conductive ring 5 passes through the conductive hole 21 and the insertion interface 11. The connecting bolt 3 is threadedly connected to the conductive ring 5 and the installation groove 13.

[0042] Reference Figure 5 The screw rod of the connecting bolt 3 has a limiting component 6 at the end away from the bolt head. The limiting component 6 includes two limiting blocks 61 disposed opposite each other on the screw rod and an elastic element 62 disposed between the two limiting blocks 61. A limiting groove 63 is formed on the screw rod, and one end of each of the two limiting blocks 61 is slidably disposed in the limiting groove 63. In this embodiment, the elastic element 62 is preferably a return spring 621 with its two ends respectively abutting between different limiting blocks 61. In other cases, it can be replaced with other elastic elements 62 that can generate elastic force, such as spring sheets, according to customer needs. A fixing groove 611 is formed at the part where the two limiting blocks 61 abut against the return spring 621, and the two ends of the return spring 621 are respectively abutted in different fixing grooves 611.

[0043] Reference Figure 5 Both limiting blocks 61 include a sliding part and a limiting part. The sliding part is disposed in the limiting groove 63. The two opposite groove walls of the limiting groove 63 are provided with connecting grooves 631. The two opposite side walls of the two limiting blocks 61 are provided with limiting holes 612 that communicate with the connecting grooves 631. A connecting rod 64 is provided in both the two connecting grooves 631 and the two limiting holes 612. The connecting rod 64 passes through the return spring 621. The two limiting blocks 61 are slidably sleeved on the connecting rod 64.

[0044] Reference Figure 5 The mounting groove 13 has a relief groove 14 on its wall away from the insertion interface 11 for the insertion of the limiting block 61. The width of the relief groove 14 is greater than the width of the mounting groove 13 in the direction perpendicular to the insertion of the connecting bolt 3 into the mounting groove 13. In this embodiment, the cross-sectional shape of both the relief groove 14 and the mounting groove 13 is preferably circular. The ends of the two limiting blocks 61 away from the screw are provided with guide slopes 613. After the two limiting blocks 61 extend into the relief groove 14, they will move away from each other under the action of the return spring 621. At this time, the maximum distance between the two limiting blocks 61 is greater than the diameter of the mounting groove 13, thus the limiting blocks 61 can limit the connecting bolt 3 within the mounting groove 13.

[0045] In this embodiment, to remove the connecting bolt 3, a through hole communicating with the relief groove 14 can be opened on the side wall of the stationary contact 1 where the insertion interface 11 is not provided, so that the two limiting blocks 61 can be moved to the side closer to each other, so that the maximum distance between the two limiting blocks 61 is less than the width of the mounting groove 13 along the direction in which the connecting bolt 3 extends into the mounting groove 13, thereby enabling the connecting bolt 3 to be moved out of the mounting groove 13.

[0046] The implementation principle of a connection structure for a circuit breaker stationary contact in this application embodiment is as follows: When connecting the circuit board 2 and the stationary contact 1, the gasket 4 is first inserted into the connecting bolt 3, and then the conductive ring 5 is inserted into the conductive hole 21 and the insertion interface 11. Then, the connecting bolt 3 is threadedly connected to the conductive ring 5 and the mounting groove 13. During the connection process between the connecting bolt 3 and the conductive ring 5, the guide slope 613 will abut against the inner wall of the conductive ring 5, thereby pushing the two limiting blocks 61 towards each other. When the connecting bolt 3 and the mounting groove 13 are threadedly connected in place, the limiting block 61 will extend into the relief groove 14. Under the action of the return spring 621, the limiting block 61 will abut against the groove wall of the relief groove 14 near the mounting groove 13, thereby preventing the connecting bolt 3 from being unscrewed out of the mounting groove 13, reducing the possibility of the connecting bolt 3 loosening, and further improving the stability of the connection between the circuit board 2 and the stationary contact 1.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A connection structure for a stationary contact of a circuit breaker, applied to a circuit breaker having a stationary contact (1) and a circuit board (2), wherein the stationary contact (1) is provided with a plug-in interface (11), characterized in that: It includes a connecting bolt (3) connecting the stationary contact (1) and the circuit board (2), the connecting bolt (3) being conductive, the circuit board (2) having a conductive hole (21) for the connecting bolt (3) to pass through, and the inner wall of the plug interface (11) having a connecting thread (111) that engages with the thread of the connecting bolt (3).

2. The connection structure for a stationary contact of a circuit breaker according to claim 1, characterized in that: The connecting bolt (3) includes a screw and a bolt head. A washer (4) is fitted on the screw. The diameter of the washer (4) is larger than the diameter of the bolt head. When the connecting bolt (3) is connected to the stationary contact (1), the washer (4) is located between the circuit board (2) and the bolt head.

3. The connection structure for a stationary contact of a circuit breaker according to claim 2, characterized in that: It also includes a conductive ring (5) connecting the stationary contact (1) and the circuit board (2). The conductive ring (5) passes through the conductive hole (21) and the insertion interface (11). The conductive ring (5) is a hollow cylinder. The inner wall of the conductive ring (5) is provided with an installation thread (51) that engages with the thread of the connecting bolt (3). The inner wall of the insertion interface (11) away from the circuit board (2) is provided with an installation groove (13). The groove wall of the installation groove (13) is provided with a fixing thread (131) that engages with the thread of the connecting bolt (3).

4. The connection structure for a stationary contact of a circuit breaker according to claim 3, characterized in that: The mounting groove (13) has a clearance groove (14) on the groove wall away from the insertion interface (11). The width of the clearance groove (14) is greater than the width of the mounting groove (13) in the direction perpendicular to the direction in which the connecting bolt (3) extends into the mounting groove (13). The end of the connecting bolt (3) away from its bolt head is provided with a limiting component (6). The limiting component (6) is used to limit the connecting bolt (3) in the mounting groove (13).

5. A connection structure for a stationary contact of a circuit breaker according to claim 4, characterized in that: The limiting assembly (6) includes two limiting blocks (61) slidably disposed on the screw and an elastic element (62) disposed between the two limiting blocks (61). A limiting groove (63) is formed on the screw, and the two limiting blocks (61) are disposed in the limiting groove (63). Limiting holes (612) are formed on the opposite sidewalls of the two limiting blocks (61). Connecting grooves (631) are formed on the two opposite groove walls of the limiting groove (63). A connecting rod (64) is provided in both of the two limiting holes (612). The two limiting blocks (61) are slidably disposed on the connecting rod (64). The elastic element (62) can drive the two limiting blocks (61) to move away from each other. When the limiting blocks (61) extend into the relief groove (14), the maximum distance between the two limiting blocks (61) is greater than the width of the mounting groove (13) in the direction perpendicular to the direction in which the connecting bolt (3) extends into the mounting groove (13).

6. A connection structure for a stationary contact of a circuit breaker according to claim 5, characterized in that: The elastic element (62) includes a return spring (621) sleeved on the connecting rod (64), and the two ends of the return spring (621) respectively abut against the side walls of different limiting blocks (61).

7. A connection structure for a stationary contact of a circuit breaker according to claim 6, characterized in that: The two limiting blocks (61) are provided with guide slopes (613) at the ends away from the screw.

8. A connection structure for a stationary contact of a circuit breaker according to claim 7, characterized in that: The two limiting blocks (61) have fixing grooves (611) on the side close to each other. One end of the reset spring (621) is set in one of the fixing grooves (611) and the other end is set in the other fixing groove (611).

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