Pressure spring retaining device and vacuum arc-extinguishing chamber

Abstract

The invention relates to the technical field of arc extinguishing devices, in particular to a pressure spring retaining device and a vacuum arc extinguishing chamber. The pressure spring retaining device comprises a contact finger seat and a screw which are used for being fixedly connected with a movable end conducting rod, a through hole for the screw to penetrate through is formed in the contact finger seat in the axial direction, one end of the screw penetrates through the through hole and forms a conducting rod connecting end used for being connected with the movable end conducting rod, and the other end of the screw is in threaded connection with a spring limiting rod. A pressure spring is sleeved outside the spring limiting rod, a gland used for compressing the pressure spring is installed at one end, far away from the contact finger seat, of the spring limiting rod in a guiding mode, a pull rod connector used for being connected with an insulating pull rod of the arc extinguish chamber is arranged on the gland, and a limiting structure used for limiting the gland is arranged on the outer side of the gland. According to the pressure spring retaining device, the pressure spring can be effectively prevented from being bent, observation is facilitated when the supporting cylinder is not installed, foreign matter can be found and cleaned in time, the structure is simple, and good application prospects are achieved.

Description

Technical Field

[0001] This invention relates to the field of arc extinguishing device technology, and in particular to a pressure spring holding device and a vacuum arc extinguishing chamber. Background Technology

[0002] Arc-extinguishing chambers are a very important component in power systems, especially vacuum arc-extinguishing chambers. The moving and stationary contacts of a vacuum arc-extinguishing chamber generally use a butt-fitting contact method. During operation, a pressure spring retaining device is mostly used to provide contact pressure to the moving and stationary contacts, ensuring good electrical contact between them.

[0003] For example, Chinese invention patent application CN110718415A, published on January 21, 2020, discloses a vacuum circuit breaker. This vacuum circuit breaker includes a moving-end conductive rod and a conductive support cylinder. The conductive support cylinder contains a spring assembly for driving the moving-end conductive rod. The spring assembly includes a spring cylinder and a spring (i.e., a compression spring) disposed within it. An inwardly protruding annular boss is provided on the bottom of the spring cylinder along its axial direction. The annular boss is used to position the spring (i.e., the compression spring). The annular boss has a support for the moving-end conductive rod. The pole passes through a through hole, and the moving end conductive rod passes through the through hole and extends into the spring cylinder. The moving end conductive rod is provided with a stop structure that is axially stopped and engaged with the bottom of the spring cylinder. One end of the moving end conductive rod extending into the spring cylinder presses the spring cylinder against the stop structure through a nut. The spring (i.e., the pressure spring) is set inside the spring cylinder. The other end of the spring cylinder is provided with a joint that is connected to the insulated pull rod drive. The joint is provided with a stop step that presses the spring (i.e., the pressure spring) against the bottom of the spring cylinder. The end of the spring cylinder away from the bottom is provided with a stop element that is axially stopped and engaged with the stop step.

[0004] The pressure spring retaining device of the aforementioned vacuum circuit breaker is a spring assembly. The spring (i.e., pressure spring) is guided and installed through a spring cylinder, making it less prone to bending during compression and ensuring the stability of closing. However, installing the spring (i.e., pressure spring) inside the spring cylinder makes it difficult to observe its condition. Furthermore, foreign matter generated during the compression of the spring (i.e., pressure spring) accumulates at the bottom of the spring cylinder, making it difficult to observe and remove. Summary of the Invention

[0005] The purpose of this invention is to provide a pressure spring holding device that solves the technical problem that it is not easy to observe and remove foreign objects in the pressure spring holding device of the prior art; at the same time, it provides a vacuum interrupter using the above-mentioned pressure spring holding device.

[0006] To achieve the above objectives, the present invention provides a technical solution for a pressure spring retaining device as follows:

[0007] A pressure spring retaining device includes a contact finger seat and a screw for fixed connection with a moving end conductive rod. The contact finger seat has a through hole along its axial direction for the screw to pass through. One end of the screw passes through the through hole and forms a conductive rod connecting end for connecting the moving end conductive rod. The other end is threadedly connected to a spring limiting rod. A pressure spring is fitted over the spring limiting rod, and a pressure cap for compressing the pressure spring is guided and installed at the end of the spring limiting rod away from the contact finger seat. The pressure cap is provided with a pull rod joint for connecting an insulating pull rod of an arc-extinguishing chamber. A limiting structure for limiting the pressure cap is provided on the outside of the pressure cap.

[0008] Beneficial Effects: Compared with the prior art, this invention provides a novel pressure spring retaining device. In use, the pressure cap compresses the pressure spring along the direction of the spring limiting rod. The pressure spring, under pressure, exerts a certain pressure on the contact finger seat, which transmits the pressure to the moving end conductive rod of the vacuum interrupter, causing the moving and stationary contacts to close. This invention exposes the pressure spring and guides it with a spring limiting rod inside, allowing the pressure spring to be compressed along the direction of the spring limiting rod. This prevents the pressure spring from bending under the closing force and facilitates observation of the pressure spring's condition, enabling timely detection and removal of foreign objects generated during compression.

[0009] Furthermore, the pull rod connector is a connecting sleeve, and the limiting structure is an adjusting nut located in the inner hole of the connecting sleeve, where the pressure cap is positioned at the upper limit of the spring limiting rod.

[0010] Furthermore, the connecting sleeve is an externally threaded sleeve, and a groove is opened on the end face of the pressure cap away from the externally threaded sleeve for installing a pressure spring.

[0011] Furthermore, a guide ring is provided between the contact surface of the spring limiting rod and the pressure cap.

[0012] Furthermore, the finger seat is a columnar body with a T-shaped cross-section, having a mating section at the lower end that mates with the moving end conductive rod and an upper mounting section for mounting a pressure spring. A limit groove is opened on the end face of the mounting section facing the compression direction of the pressure spring, and the pressure spring is disposed in the limit groove.

[0013] Furthermore, an anti-loosening nut for abutting and locking the contact finger seat is provided on the spring limiting rod within the limiting groove.

[0014] Furthermore, a copper pad is provided between the contact surface of the pressure spring and the limiting groove.

[0015] Furthermore, a disc spring is provided between the copper washer and the anti-loosening nut.

[0016] Furthermore, the pressure spring retaining device also includes a support cylinder that is guided and fitted, the support cylinder being stepped with open ends and its diameter increasing along the compression direction of the pressure spring.

[0017] To achieve the above objectives, the present invention provides a technical solution for a vacuum interrupter chamber as follows:

[0018] A vacuum interrupter includes a moving-end conductive rod and a pressure spring retaining device. The pressure spring retaining device includes a contact finger seat and a screw for fixed connection with the moving-end conductive rod. The contact finger seat has a through hole along its axial direction for the screw to pass through. One end of the screw passes through the through hole and forms a conductive rod connecting end for connecting the moving-end conductive rod. The other end is threadedly connected to a spring limiting rod. A pressure spring is fitted over the spring limiting rod, and a pressure cap for compressing the pressure spring is guided and installed at the end of the spring limiting rod away from the contact finger seat. The pressure cap is provided with a pull rod joint for connecting an insulating pull rod to the interrupter. A limiting structure for limiting the pressure cap is provided on the outside of the pressure cap.

[0019] Beneficial effects: The present invention also provides a new vacuum interrupter, which includes the above-mentioned pressure spring holding device. The pressure spring holding device ensures that the pressure spring will not bend or deform during compression by exposing the pressure spring and setting a spring limiting rod inside it. At the same time, the exposed pressure spring is easy to observe, which is conducive to timely detection and cleaning of foreign objects generated during the compression of the pressure spring.

[0020] Furthermore, the pull rod connector is a connecting sleeve, and the limiting structure is an adjusting nut located in the inner hole of the connecting sleeve, where the pressure cap is positioned at the upper limit of the spring limiting rod.

[0021] Furthermore, the connecting sleeve is an externally threaded sleeve, and a groove is opened on the end face of the pressure cap away from the externally threaded sleeve for installing a pressure spring.

[0022] Furthermore, a guide ring is provided between the contact surface of the spring limiting rod and the pressure cap.

[0023] Furthermore, the finger seat is a columnar body with a T-shaped cross-section, having a mating section at the lower end that mates with the moving end conductive rod and an upper mounting section for mounting a pressure spring. A limit groove is opened on the end face of the mounting section facing the compression direction of the pressure spring, and the pressure spring is disposed in the limit groove.

[0024] Furthermore, an anti-loosening nut for abutting and locking the contact finger seat is provided on the spring limiting rod within the limiting groove.

[0025] Furthermore, a copper pad is provided between the contact surface of the pressure spring and the limiting groove.

[0026] Furthermore, a disc spring is provided between the copper washer and the anti-loosening nut.

[0027] Furthermore, the pressure spring retaining device also includes a support cylinder that is guided and fitted, the support cylinder being stepped with open ends and its diameter increasing along the compression direction of the pressure spring. Attached Figure Description

[0028] Figure 1 This is a state diagram of the opening point of an embodiment of the pressure spring holding device of the present invention;

[0029] Figure 2 for Figure 1 The state diagram of the point of perfect coincidence;

[0030] Figure 3 for Figure 1 The state diagram of the closing point.

[0031] In the diagram: 1. Contact finger seat; 2. Contact finger; 3. Pressure spring; 4. Pressure cap guide ring; 5. Pressure cap; 6. Copper washer; 7. Screw; 8. Disc spring; 9. Anti-loosening nut; 10. Spring limit rod; 11. Guide ring; 12. Nut guide ring; 13. Adjusting nut; 14. Insulating pull rod connector; 15. Pin; 16. Insulating pull rod; 17. Support cylinder; 18. Vacuum bubble; 19. Vacuum hole; 20. Moving end conductive rod; 21. Pull rod joint. Detailed Implementation

[0032] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0033] This invention provides a novel pressure spring retaining device. When the pressure spring retaining device is tested for breakage before leaving the factory, it is easy to observe the compression state of the pressure spring along the spring limit rod without the outer support cylinder being installed. At the same time, foreign objects will be generated by the pressure spring during compression. The foreign objects accumulate on the contact surface between the finger seat and the pressure spring, which can be detected in time and cleaned by a vacuum cleaner.

[0034] This application provides a new pressure spring retaining device. Its main concept is to expose the pressure spring and set a spring limiting rod inside it for guiding the pressure spring to prevent the pressure spring from bending when subjected to closing force. At the same time, since the pressure spring is exposed, it is easy to observe the condition of the pressure spring and detect foreign objects generated during the compression process in time, which is convenient for timely cleaning.

[0035] Based on the above concept, the basic technical solution of the present invention is as follows: It includes a contact finger seat 1 and a screw 7 for fixed connection with the moving end conductive rod 20. The contact finger seat 1 is used to conduct electricity with the moving end conductive rod. The screw 7 is an upper double-ended screw. The contact finger seat 1 has a through hole along its axial direction for the screw 7 to pass through. One end of the screw 7 passes through the through hole and forms a conductive rod connection end for connecting the moving end conductive rod 20. The conductive rod connection end has an external thread for connecting the moving end conductive rod. The other end of the screw 7 is threadedly connected to a spring limiting rod 10. The spring limiting rod 10 is used to guide and limit the pressure spring. A pressure spring 3 is fitted around the spring limit rod 10, and a pressure cap 5 for compressing the pressure spring 3 is guided and installed at the end of the spring limit rod 10 away from the contact finger seat 1. The pressure cap 5 is used to apply pressure to the pressure spring. The pressure cap 5 is provided with a pull rod joint 21 for connecting the insulating pull rod 16 of the arc-extinguishing chamber. The pull rod joint 21 is used to connect the insulating pull rod so that the insulating pull rod transmits force to the pull rod joint 21, thereby pushing the pressure spring to compress. A limiting structure for limiting the pressure cap is provided on the outside of the pressure cap. The limiting structure is used to adjust the compression amount of the pressure spring in the initial state and to stop the axial movement of the pressure cap.

[0036] The following examples illustrate this:

[0037] This invention provides a pressure spring retaining device, such as... Figures 1-3As shown, the device includes a contact seat 1 electrically connected to the moving end conductive rod 20 and a pressure spring 3 for holding the circuit closed. The contact seat 3 is a columnar body with a T-shaped cross-section. It has a mating section at the lower end that mates with the moving end conductive rod 20 and an upper mounting section for mounting the pressure spring 3. The contact seat 3 has a through hole along its axial direction for the screw 7 to pass through. One end of the screw 7 passes through the through hole and forms a conductive rod connecting end for connecting the moving end conductive rod 20. The other end is connected to a spring limiting rod 10 by a thread. The pressure spring 3 is fitted on the spring limiting rod 10, and a pressure cap 5 for compressing the pressure spring 3 is installed at the end of the pressure spring 3 away from the contact seat 1, so that the two ends of the pressure spring 3 abut against the contact seat 1 and the pressure cap 5 respectively. The pressure cap 5 is provided with a pull rod joint 21 for connecting the insulating pull rod 16 of the arc-extinguishing chamber. A limiting structure for limiting the pressure cap is provided on the outside of the pressure cap. In use, the insulating pull rod 16 of the arc-extinguishing chamber is connected to the insulating pull rod connecting part 14 via a pin 15. The insulating pull rod connecting part 14 is fixedly connected to the pull rod joint 21. Power is transmitted to the insulating pull rod connecting part 14 through the insulating pull rod 16. The insulating pull rod connecting part 14 and the pull rod joint 21 together push the pressure cover 5, causing the pressure spring 3 to be compressed under the force of the spring limiting rod 10. In this embodiment, because the spring limiting rod 10 is set inside the pressure spring, the pressure spring 3 is compressed along the direction of the spring limiting rod 10, ensuring that the pressure spring 3 will not bend when subjected to the closing force. At the same time, compared with the prior art of using a spring cylinder to install the pressure spring to ensure that the pressure spring does not bend, the pressure spring in this application is exposed and easy to observe, and foreign objects generated during the compression process of the pressure spring can be detected and cleaned in time.

[0038] In one embodiment, the pull rod connector 21 is a connecting sleeve, and a retaining spring is provided in the inner hole of the connecting sleeve to stop the pressure cap 5 on the spring limiting rod 10. The retaining spring helps prevent the pressure cap 5 from falling off the spring limiting rod 10 due to the release force of the pressure spring 3. However, the retaining spring only serves a stopping function and cannot adjust the initial compression state of the pressure spring. Therefore, the present invention provides a more preferred embodiment, such as... Figure 1-3 As shown, the pull rod connector 21 is a connecting sleeve, and the limiting structure is an adjusting nut 13 located in the inner hole of the connecting sleeve, which limits the pressure cap 5 to the upper limit of the spring limiting rod 10. In this embodiment, by providing an adjusting nut 13 along its axial direction in the inner hole of the connecting sleeve for axially limiting and stopping the pressure cap, it is convenient to adjust the initial compression amount of the pressure spring before the pressure spring 3 is compressed, while also serving as a stop.

[0039] The present invention provides a preferred embodiment, such as... Figure 1-3As shown, the connecting sleeve is an externally threaded sleeve, and a groove is formed on the end face of the pressure cap 5 away from the externally threaded sleeve for installing the pressure spring. That is, the outer circumference of the connecting sleeve has external threads for connecting the insulating pull rod connecting part 14, and the end face of the pressure cap away from the externally threaded sleeve has a groove for installing the pressure spring 3. By designing the connecting sleeve as an externally threaded sleeve, it facilitates the installation of the insulating pull rod during use, making it convenient and quick to use. Simultaneously, the groove on the other end face of the pressure cap allows the end face of the pressure spring to abut against the groove, resulting in a stable and reliable structure.

[0040] The present invention provides a preferred embodiment, such as... Figure 1-3 As shown, a guide ring 11 is provided between the spring limit rod 10 and the pressure cover 5, so that the pressure cover 5 can smoothly guide the compression spring 3 on the spring limit rod 10, making the closing more stable.

[0041] The present invention provides a preferred embodiment, such as... Figure 1-3 As shown, a limiting groove is opened on the end face of the mounting section of the finger seat 1 facing the compression direction of the pressure spring 3. A spring limiting rod 10 is provided with an anti-loosening nut 9 in the limiting groove for abutting and locking the finger seat 1. In this embodiment, the screw 7 and the spring limiting rod 10 are fixed as a whole. The conductive rod connecting end of the lower part of the screw 7 is threadedly connected and fixed to the moving end conductive rod 20. The finger seat 1 is fitted on the screw 7 and the moving end conductive rod. The two ends of the pressure spring 3 abut against the limiting groove of the finger seat 1 and the groove of the pressure cap 5, respectively. At this time, the finger seat 1 abuts against the moving end conductive rod through the pressure spring. In order to prevent the finger seat from loosening, an anti-loosening nut 9 is fitted on the spring limiting rod 10 so that the anti-loosening nut 9 is located in the limiting groove of the finger seat and presses the finger seat axially downward to prevent loosening.

[0042] The present invention provides a preferred embodiment, such as... Figure 1-3 As shown, a copper pad 6 is provided between the contact surface of the pressure spring 3 and the limiting groove. By providing the copper pad 6 in the limiting groove of the pressure spring 3 and the finger seat 1, the wear of the finger seat 1 by the pressure spring 3 during compression can be effectively prevented.

[0043] The present invention provides a preferred embodiment, such as... Figure 1-3 As shown, a disc spring 8 is provided between the copper washer 6 and the anti-loosening nut 9. The disc spring 8 is equivalent to an anti-loosening washer, which can further enhance the anti-loosening effect.

[0044] The present invention provides a preferred embodiment, such as... Figure 1-3As shown, the pressure spring holding device of the present invention also includes a support cylinder 17 with openings at both ends. The support cylinder 17 is stepped, and its diameter increases along the compression direction of the pressure spring 3. The support cylinder 17 is guided and fitted onto the pressure spring holding device along the compression direction of the pressure spring 3. The support cylinder 17 has a lower limiting boss and an upper limiting slope. The pressure spring 3 and the pressure cover 5 are disposed between the limiting boss and the limiting slope. The contact finger seat 1 is disposed in the inner cavity of the support cylinder 17 below the limiting boss. Both the pressure cover 5 and the contact finger seat 1 can slide up and down along the axial direction of the support cylinder 17. A contact finger 2 and a contact finger seat guide ring are provided between the support cylinder 17 and the contact finger seat 1. A pressure cover guide ring 4 is provided between the support cylinder 17 and the pressure cover 5, so that the contact finger seat 1 and the pressure cover 5 can slide smoothly within the support cylinder, which is beneficial to the stability of closing the circuit.

[0045] This invention provides another technical solution, applying the aforementioned pressure spring holding device to a vacuum interrupter. This vacuum interrupter includes a moving-end conductive rod 20 and a pressure spring holding device. In use, the insulating pull rod 16 and the insulating pull rod connecting part 14 are connected by a pin 15, transmitting power to the insulating pull rod connecting part 14. The insulating pull rod connecting part 14 pushes the pressure cover 5 through the pull rod joint 21, causing the pressure cover 5 to compress the pressure spring 3. The pressure spring 3 deforms under pressure and generates elastic force to press against the contact finger seat 1. The contact finger seat 1 transmits force to the moving-end conductive rod 20, causing the moving contact to approach the stationary contact for closing. Under the action of the spring force 3, the closed state is maintained. During the pre-shipment break-in test of the vacuum interrupter of this invention, the pressure spring is exposed because no external support cylinder is installed, facilitating observation and timely detection and removal of foreign objects. The structure is simple and has good application prospects.

[0046] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A pressure spring retaining device characterized by, It includes a contact finger seat and a screw for fixed connection with the moving end conductive rod. The contact finger seat has a through hole along its axial direction for the screw to pass through. One end of the screw passes through the through hole and forms a conductive rod connection end for connecting the moving end conductive rod. The other end is threaded to a spring limiting rod. A pressure spring is fitted on the outside of the spring limiting rod, and a pressure cap for compressing the pressure spring is installed at the end of the spring limiting rod away from the contact finger seat. The pressure cap is provided with a pull rod joint for connecting an insulating pull rod to the arc-extinguishing chamber. A limiting structure for limiting the pressure cap is provided on the outside of the pressure cap.

2. The pressure spring retaining device according to claim 1, characterized in that, The pull rod connector is a connecting sleeve, and the limiting structure is an adjusting nut located in the inner hole of the connecting sleeve, where the pressure cap is positioned at the upper limit of the spring limiting rod.

3. The pressure spring retaining device according to claim 2, characterized in that, The connecting sleeve is an external threaded sleeve, and a groove is opened on the end face of the pressure cap away from the external threaded sleeve for installing a pressure spring.

4. The pressure spring retaining device according to claim 3, characterized in that, A guide ring is provided between the contact surface of the spring limiting rod and the pressure cap.

5. The pressure spring retaining device according to any one of claims 1-4, characterized in that, The finger seat is a T-shaped column with a lower end that mates with the moving end conductive rod and an upper mounting section for mounting a pressure spring. A limit groove is opened on the end face of the mounting section facing the compression direction of the pressure spring, and the pressure spring is set in the limit groove.

6. The pressure spring retaining device according to claim 5, characterized in that, An anti-loosening nut is provided on the spring limiting rod in the limiting groove to abut and lock the contact finger seat.

7. The pressure spring retaining device according to claim 6, characterized in that, A copper pad is provided between the contact surface of the pressure spring and the limiting groove.

8. The pressure spring retaining device according to claim 7, characterized in that, A disc spring is provided between the copper washer and the anti-loosening nut.

9. The pressure spring retaining device according to any one of claims 1-4, characterized in that, The pressure spring retaining device also includes a support cylinder that is guided and fitted, the support cylinder being stepped with open ends and its diameter increasing along the compression direction of the pressure spring.

10. A vacuum interrupter, comprising a moving-end conductive rod and a pressure spring retaining device, characterized in that, The structure of the pressure spring retaining device is as described in any one of claims 1-9.

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