Connecting mechanism and withstand voltage test device for circuit breaker

Abstract

The utility model provides a connecting mechanism which is used for a withstand voltage test device of a circuit breaker. The connecting mechanism comprises a driving unit, a test rod and a sleeve. The two ends of the test rod are respectively a test end and a connection end, and the test end is used for being connected with a moving contact of a circuit breaker to be tested. The sleeve sleeves the test rod, the test end is located outside the sleeve, the connecting end is located inside the sleeve, an elastic piece is arranged between the connecting end and the inner bottom surface of the sleeve, the test rod can move relative to the sleeve in the moving direction and the opposite direction, and the moving direction is parallel to the axial direction of the sleeve. Wherein the sleeve can be driven by the driving unit to move in the moving direction, and the inner bottom face of the sleeve can apply acting force in the moving direction to the connecting end through the elastic piece. The connecting mechanism can be suitable for different types of circuit breaker moving contacts, and the test efficiency is improved. The utility model also provides a withstand voltage test device for the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of testing, and in particular to a connection mechanism for a withstand voltage testing device for circuit breakers, and also to a testing device for circuit breakers having the connection mechanism. Background Technology

[0002] After the circuit breaker is manufactured, it needs to undergo a withstand voltage test to verify its insulation performance. However, there are different types of moving contacts for circuit breakers, such as butt contacts (i.e., contacts with a flat contact surface) and insert contacts (such as Phillips head contacts).

[0003] Existing withstand voltage testing devices require replacing the connection mechanism with one compatible with the moving contact type of different circuit breakers when testing their moving contacts. However, a single production line may support the production of multiple types of circuit breakers. Therefore, the time required for changing the connection mechanism in existing withstand voltage testing devices negatively impacts the testing efficiency of circuit breakers. Utility Model Content

[0004] The purpose of this invention is to provide a connection mechanism that can be applied to moving contacts of different types of circuit breakers, thereby improving testing efficiency.

[0005] This invention provides a connecting mechanism for a withstand voltage testing device. The connecting mechanism includes a driving unit, a test rod, and a sleeve. The test rod has a test end and a connecting end at its two ends, respectively. The test end is used to connect to a moving contact of a circuit breaker under test. The sleeve is fitted onto the test rod, with the test end located outside the sleeve and the connecting end located inside the sleeve. An elastic element is disposed between the connecting end and the inner bottom surface of the sleeve. The test rod can move relative to the sleeve in a moving direction and its opposite direction, the moving direction being parallel to the axial direction of the sleeve. The sleeve can move along the moving direction under the drive of the driving unit, and the inner bottom surface of the sleeve can apply a force along the moving direction to the connecting end through the elastic element.

[0006] In another illustrative embodiment of the connecting mechanism of this utility model, the main body of the test rod is cylindrical, and the end face of the test end is perpendicular to the axial direction of the test rod; the elastic element is a compression spring. A first connecting member is also provided on the test rod, and the surface of the first connecting member facing the circuit breaker under test is perpendicular to the axial direction of the test rod. Its structure is simple and easy to implement.

[0007] In another illustrative embodiment of the connecting mechanism of this utility model, a limiting protrusion is further provided on the test rod. The limiting protrusion protrudes radially along the test rod, and is located between the connecting end and the test end, and outside the sleeve. The first connecting member can connect to a high-voltage generator. The first connecting member is fixed to the body of the test rod by a second screw and to the limiting protrusion by a first screw. The axial direction of the second screw is parallel to the radial direction of the test rod, and the axial direction of the first screw is parallel to the axial direction of the test rod. The first connecting member can be reliably connected to the test rod, ensuring that the test voltage can be reliably applied to the moving contact of the circuit breaker under test, thus improving the safety and reliability of the test.

[0008] In another illustrative embodiment of the connecting mechanism of this utility model, the connecting mechanism further includes a first limiting ring. The first limiting ring is coaxially arranged with the sleeve and is disposed on the inner wall of the open end of the sleeve. The inner diameter of the first limiting ring is adapted to the outer diameter of the portion of the test rod that extends into the sleeve. This prevents the test rod from wobbling within the sleeve.

[0009] In another illustrative embodiment of the connecting mechanism of this utility model, the connecting mechanism further includes a second limiting ring. The second limiting ring is coaxially arranged with the sleeve and is disposed on the inner bottom surface of the sleeve. One end of the elastic element is sleeved on the second limiting ring, and the other end abuts against the end face of the connecting end. This prevents the elastic element from twisting within the sleeve.

[0010] In another illustrative embodiment of the connecting mechanism of this utility model, a second connecting member is further provided on the test rod. The second connecting member is fixedly connected to the test rod, and a position sensor is provided on the second connecting member. This allows the position of the test rod to be acquired in order to control the drive unit.

[0011] In another illustrative embodiment of the connecting mechanism of this utility model, a sliding groove is provided on the sleeve, and the extending direction of the sliding groove is parallel to the moving direction; the second connecting member includes a connecting body and a connecting part. The position sensor is mounted on the connecting body. One end of the connecting part is fixedly connected to the connecting body, and the other end passes through the sliding groove and is fixedly connected to the test rod. This reduces the size of the connecting mechanism.

[0012] In another illustrative embodiment of the connection mechanism of this utility model, the position sensor is a limit switch; when the relative displacement between the test rod and the sleeve in the moving direction reaches the maximum safe position, the limit switch can be triggered to control the drive unit to stop operating, in order to prevent damage to the moving contact of the circuit breaker.

[0013] In another illustrative embodiment of the connecting mechanism of this utility model, the connecting mechanism further includes an insulating unit. The two ends of the insulating unit are respectively connected to the closed end of the sleeve and the driving part of the driving unit.

[0014] This invention also provides a withstand voltage testing device for circuit breakers, which includes the connection mechanism described in any of the above descriptions. It is applicable to different types of moving contacts of circuit breakers and can improve testing efficiency. Attached Figure Description

[0015] The following figures are for illustrative purposes only and do not limit the scope of the present invention.

[0016] Figure 1 This is a schematic diagram illustrating the structure of the connection mechanism in this application.

[0017] Figure 2 This is another structural schematic diagram used to illustrate the connection mechanism of this application.

[0018] Figure 3 for Figure 2 An exploded view of the structure shown.

[0019] Figure 4a This is a cross-sectional schematic diagram illustrating the connection mechanism of this application in one state.

[0020] Figure 4b This is a cross-sectional schematic diagram illustrating the connection mechanism of this application in another state.

[0021] The reference numerals in the attached figures are as follows:

[0022] 11 test rods

[0023] The end face on the 110 test terminal

[0024] 111 limit convex part

[0025] 12 First Connector

[0026] 121 First screw hole

[0027] 122 Second screw hole

[0028] 13 sleeves

[0029] 131 sliding groove

[0030] 132 flange

[0031] 14 elastic elements

[0032] 15 First Limiting Ring

[0033] 16 Second connector

[0034] 161 Connecting Part

[0035] 20 support bases

[0036] 30 Insulation Device

[0037] 40 drive units

[0038] A. Movement direction Detailed Implementation

[0039] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, specific embodiments of this utility model are now described with reference to the accompanying drawings. In the drawings, the same reference numerals indicate components with the same or similar structures but the same function.

[0040] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0041] To keep the drawings concise, only the parts related to this utility model are shown schematically in each figure, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some figures, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0042] In this text, "one" can mean not only "only one" but also "more than one". In this text, "first", "second", etc., are used only to distinguish them from each other, not to indicate their importance or order. The direction of movement A is parallel to the axis of sleeve 13.

[0043] Figure 1 This is a schematic diagram illustrating the structure of the connection mechanism in this application. Figure 2 This is another structural schematic diagram used to illustrate the connection mechanism of this application.

[0044] Figure 1 The present application illustrates a connection mechanism for a withstand voltage testing device. When a circuit breaker is subjected to a withstand voltage test, the connection mechanism can reliably connect the moving contact of the circuit breaker and can adapt to various types of moving contacts of circuit breakers. Figure 2 It shows Figure 1 Enlarged view of some components of the connecting mechanism.

[0045] like Figure 1 As shown, the connecting mechanism includes a test rod 11, a sleeve 13, and a drive unit 40. The sleeve 13 is fitted onto the test rod 11, and the drive unit 40 can drive the sleeve 13 to move along the moving direction A.

[0046] like Figure 2 As shown, the test rod 11 has a test end and a connection end at its two ends, respectively, and a first connector 12 can be fixedly installed on the test rod 11. The test end is used to connect to a moving contact of a circuit breaker under test, and the connection end is located inside the sleeve 13. For example, when the moving contact of the circuit breaker is a cloverleaf contact, the test end of the test rod 11 can extend into the cloverleaf contact and be held by the contact fingers of the cloverleaf contact to achieve effective contact; alternatively, the contact surface of the first connector 12 can abut against the end of the cloverleaf contact to achieve effective contact; or, simultaneously, the outer periphery of the test end and the contact surface of the first connector 12 can both connect to the cloverleaf contact to achieve effective contact. When the moving contact of the circuit breaker is a butt contact, the end face of the test end of the test rod 11 can abut against the contact surface of the butt contact.

[0047] A sleeve 13 is fitted onto a test rod 11, with the connecting end of the test rod 11 extending into the sleeve 13 and the testing end located outside the sleeve 13. An elastic element 14 is also provided between the inner bottom surface of the sleeve 13 and the connecting end of the test rod 11. The test rod 11 can move relative to the sleeve 13 in the direction of movement A and its opposite direction. This elastic element 14 can be a compression spring.

[0048] When the drive unit 40 drives the sleeve 13 to move along the moving direction A toward the moving contact of the circuit breaker, the sleeve 13 can drive the test rod 11 to move toward the moving contact via the elastic element 14. When the test end of the test rod 11 reaches the moving contact of the circuit breaker, the drive unit 40 continues to drive the sleeve 13 to move toward the moving contact to compress the elastic element 14, thereby providing sufficient force to the test rod 11 so that the test end of the test rod 11 and / or the first connecting member 12 can effectively contact the moving contact of the circuit breaker. In addition, since a spring is provided between the test rod 11 and the sleeve 13, the force exerted by the test rod 11 or the first connecting member 12 on it on the moving contact of the circuit breaker gradually increases, which can also prevent damage to the circuit breaker due to excessive mechanical force during testing.

[0049] To further reduce the risk of damage to the moving contact of the circuit breaker due to excessive mechanical force at the test end, a second connector 16 can be fixedly installed on the test rod 11, and a position sensor can be installed on the second connector 16. This position sensor can detect the relative distance between the test rod 11 and the sleeve 13 in the direction of movement A, so as to reliably control the magnitude of the force applied by the test rod 11 to the moving contact.

[0050] Since a high voltage needs to be applied to the test rod 11 during testing, the high-voltage side and control side of the withstand voltage test device need to be isolated. This can be achieved by... Figure 1An insulating unit 30 is provided between the sleeve 13 and the drive unit 40 to isolate the test rod 11 and the drive unit 40, thereby improving the safety of the operator during testing. The drive unit 40 can be a cylinder or other drive device. The two ends of the insulating unit 30 can be connected to the closed end of the sleeve 13 and the drive part of the drive unit 40 respectively through a flange structure.

[0051] Figure 3 for Figure 2 An exploded view of the structure shown.

[0052] like Figure 2 As shown, the main body of the test rod 11 can be cylindrical, and the end face 110 on its test end is designed to be perpendicular to the axial direction of the test rod 11. The first connecting member 12 is fixedly sleeved on the test rod 11, and its shape can be plate-shaped, with its surface facing the moving contact of the circuit breaker under test perpendicular to the axial direction of the test rod 11. This design of the test rod 11 is not only simple in structure and easy to manufacture, but also allows for effective contact with the end of the plum blossom contact through the contact surface on the first connecting member 12, and effective contact with the contact surface of the butt contact through the end face 110 on its test end. Moreover, the contact surface on the first connecting member 12 can ensure the effectiveness of the contact with the plum blossom contact.

[0053] To apply a high test voltage to test rod 11 and ensure connection reliability, it is possible to... Figure 3 The diagram shows a further provision on the test rod 11 including a limiting protrusion 111 and a first connector 12. The first connector 12 is used to connect a high-voltage generator. The limiting protrusion 111 is used to limit the movement of the first connector 12. Figure 3 As shown, the limiting protrusion 111 protrudes radially along the test rod 11 and is located between the connecting end and the test end, outside the sleeve 13. The first connecting member 12 can be plate-shaped with a through hole. The first connecting member 12 is sleeved on the test rod 11 through the through hole. The first connecting member 12 is fixed to the body of the test rod 11 by a second screw and to the limiting protrusion 111 by a first screw. The axis of the second screw is parallel to the radial direction of the test rod 11, and the axis of the first screw is parallel to the axial direction of the test rod 11. The first connecting member 12 has a first screw hole 121 and a second screw hole 122, and the first screw and the second screw are respectively installed in the first screw hole 121 and the second screw hole 122. Thus, the first connecting member 12 is fixed to the test rod 11 in two mutually perpendicular directions, ensuring the reliability of the connection between the first connecting member 12 and the test rod 11.

[0054] To reduce the length of the connecting mechanism in the direction of movement A, it can be done as follows: Figure 3As shown, a sliding groove 131 is provided on the sleeve 13. The extending direction of the sliding groove 131 is parallel to the moving direction A. The second connector 16 can be designed to include a connecting body and a connecting part 161. The connecting body is used to mount a position sensor. One end of the connecting part 161 is fixedly connected to the connecting body, and the other end passes through the sliding groove 131 and is fixedly connected to the test rod 11.

[0055] To prevent excessive force applied to the moving contact by the test rod 11 from damaging the circuit breaker, a maximum value for the relative displacement between the sleeve 13 and the test rod 11 can be set, thereby controlling the maximum force applied to the test rod 11 by the spring 14. Specifically, the position sensor can be a limit switch. When the relative displacement between the test rod 11 and the sleeve 13 in the direction of movement A reaches the maximum safe position, the limit switch can be triggered to control the drive unit 40 to stop operating.

[0056] To prevent the test rod 11 from wobbling within the sleeve 13, a first limiting ring 15 can be further provided on the connecting mechanism. This first limiting ring 15 is coaxially arranged with the sleeve 13 and is located on the inner wall of the open end of the sleeve 13. The first limiting ring 15 can be fixed to the inner wall of the sleeve 13 by a screw. The inner diameter of the first limiting ring 15 is set to match the outer diameter of the portion of the test rod 11 that extends into the sleeve 13, thereby limiting and preventing the test rod 11 from wobbling within the sleeve 13.

[0057] Furthermore, a second limiting ring can be provided on the connecting mechanism to prevent the spring 14 from twisting within the sleeve 13. This second limiting ring is coaxially arranged with the sleeve 13 and is located on the inner bottom surface of the sleeve 13. One end of the spring 14 is fitted onto the second limiting ring, and the other end abuts against the end face of the connecting end of the test rod 11. Similarly, the second limiting ring can be fixed to the inner wall of the sleeve 13 by a screw.

[0058] This application also provides a pressure resistance testing device, which includes a connection mechanism as described in any of the above embodiments. Further details will not be provided here.

[0059] Figure 4a This is a cross-sectional schematic diagram illustrating the connection mechanism of this application in one state. Figure 4b This is a cross-sectional schematic diagram illustrating the connection mechanism of this application in another state.

[0060] Figure 4a A cross-sectional view is shown of the test end of the test rod 11 or the first connector 12 on it just abutting the moving contact. Figure 4b A schematic diagram is shown showing the test end of the test rod 11 or the first connector 12 on it reliably abutting against the moving contact.

[0061] During the withstand voltage test, the drive unit 40 drives the insulation unit 30 and the sleeve 13 to move along the moving direction A toward the moving contact of the circuit breaker. The test rod 11 moves along with the sleeve 13 due to the action of the spring 14. When the sleeve 13 moves to... Figure 4a When the position shown is such that the test rod 11 or its first connector 12 is just in the connection position with the moving contact, the drive unit 40 further drives the sleeve 13 to move towards the moving contact, while the test rod 11 or its first connector 12 is restricted to its current position due to the contact with the moving contact. The sleeve 13 compresses the spring 14, which in turn applies pressure to the test rod 11 so that the test rod 11 or the first connector 12 can effectively contact the moving contact. When the test ends, the sleeve 13 is driven in the direction of movement A, the test rod 11 or the first connector 12 moves away from the moving contact, and the spring 14 causes the test rod 11 to return to its initial position within the sleeve 13. This connection mechanism can support insulation testing of both handcart-type and stationary circuit breakers, and during testing, it can effectively contact the moving contact without damaging the circuit breaker under test.

[0062] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other implementations that can be understood by those skilled in the art. The nouns and pronouns referring to people in this patent application are not limited to specific genders.

[0063] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent implementation schemes or modifications made without departing from the spirit of the present utility model, such as combinations, divisions or repetitions of features, should be included within the scope of protection of the present utility model.

Claims

1. A connection mechanism for a withstand voltage testing device for a circuit breaker, characterized in that, The connecting mechanism includes: One drive unit (40); A test rod (11) has a test end and a connection end at its two ends, the test end being used to connect to a moving contact of a circuit breaker under test; and A sleeve (13) is fitted onto the test rod (11), the test end is located outside the sleeve (13), the connecting end is located inside the sleeve (13), and an elastic element (14) is provided between the connecting end and the inner bottom surface of the sleeve (13). The test rod (11) can move relative to the sleeve (13) along the moving direction (A) and its opposite direction, the moving direction (A) being parallel to the axial direction of the sleeve (13). The sleeve (13) can move along the moving direction (A) under the drive of the drive unit (40), and the inner bottom surface of the sleeve (13) can apply a force along the moving direction (A) to the connecting end through the elastic member (14).

2. The connecting mechanism according to claim 1, characterized in that: The main body of the test rod (11) is cylindrical, and the end face on the test end is perpendicular to the axial direction of the test rod (11); the elastic element (14) is a compression spring; The test rod (11) is also provided with a first connector (12), which is fixedly sleeved on the test rod (11), and the surface of the first connector (12) facing the circuit breaker under test is perpendicular to the axial direction of the test rod (11).

3. The connecting mechanism according to claim 2, characterized in that: The test rod (11) is also provided with a limiting protrusion (111), which protrudes radially along the test rod (11). The limiting protrusion (111) is located between the connecting end and the test end, and is located outside the sleeve (13). The first connector (12) can be connected to a high voltage generator. The first connector (12) is fixed to the body of the test rod (11) by a second screw and fixed to the limiting protrusion (111) by a first screw. The axial direction of the second screw is parallel to the radial direction of the test rod (11), and the axial direction of the first screw is parallel to the axial direction of the test rod (11).

4. The connecting mechanism according to claim 2, characterized in that, The connecting mechanism further includes: A first limiting ring (15) is arranged coaxially with the sleeve (13) and is disposed on the inner wall of the opening end of the sleeve (13). The inner diameter of the first limiting ring (15) is adapted to the outer diameter of the portion of the test rod (11) that extends into the sleeve (13).

5. The connecting mechanism according to claim 2, characterized in that, The connecting mechanism further includes: A second limiting ring is arranged coaxially with the sleeve (13) and is disposed on the inner bottom surface of the sleeve (13). One end of the elastic element (14) is sleeved on the second limiting ring, and the other end abuts against the end face of the connecting end.

6. The connecting mechanism according to claim 1, characterized in that, The test rod (11) is also equipped with: A second connector (16) is fixedly connected to the test rod (11), and a position sensor is provided on the second connector (16).

7. The connecting mechanism according to claim 6, characterized in that: The sleeve (13) is provided with a sliding groove (131), and the extending direction of the sliding groove (131) is parallel to the moving direction (A); The second connector (16) includes: A connecting body on which the position sensor is mounted; and A connecting part (161) has one end fixedly connected to the connecting body and the other end fixedly connected to the test rod (11) through the sliding groove (131).

8. The connecting mechanism according to claim 7, characterized in that: The position sensor is a limit switch; When the relative displacement between the test rod (11) and the sleeve (13) in the moving direction (A) reaches the maximum safe position, the limit switch can be triggered to control the drive unit (40) to stop its operation.

9. The connecting mechanism according to claim 1, characterized in that, The connecting mechanism further includes: An insulating unit (30) is provided, with its two ends connected to the closed end of the sleeve (13) and the driving part of the driving unit (40), respectively.

10. A withstand voltage testing device for circuit breakers, characterized in that, Includes the connection mechanism as described in any one of claims 1-9.

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