A vacuum interrupter

Abstract

The utility model relates to a vacuum arc extinguishing chamber, including arc extinguishing chamber casing, the front end fixed with static contact of arc extinguishing chamber casing, the rear end of arc extinguishing chamber casing is along the front -back direction direction guiding movement assembly has movable contact, the front end of movable contact is along the front -back direction direction guiding movement assembly has movable contact contact piece, movable contact contact piece with movable contact between the setting has movable contact spring, the rear end of static contact has the static contact guide rod of axis along the extension of front -back direction of static contact, the static contact guide rod is connected with the conducting sleeve of guide sleeve, the front end fixed with the static contact contact piece for with movable contact contact cooperation of conducting sleeve, static contact with static contact contact piece between the setting has static contact spring, static contact spring, movable contact spring all are compression spring, the rear end of static contact guide rod is for with the ball head structure of conducting sleeve rear end point contact cooperation. The utility model's purpose lies in providing a kind of arc extinguishing chamber, to reduce the generation of " stickiness " phenomenon between movable contact, static contact by improving the opening force.

Description

Technical Field

[0001] This utility model relates to the field of electrical switch technology, and in particular to a vacuum interrupter. Background Technology

[0002] Vacuum circuit breakers are a common type of electrical switch. They are named for the high vacuum in both the arc-extinguishing medium and the insulating medium between the contacts after arc extinguishing. Vacuum circuit breakers play a vital role in the field of electrical safety.

[0003] A vacuum circuit breaker includes a vacuum interrupter and an operating mechanism that drives the moving contacts of the vacuum interrupter to perform opening and closing operations. The specific structure of the vacuum interrupter is as follows: Figure 1 As shown: It includes an arc-extinguishing chamber housing 2, a stationary contact 1 fixed at the front end of the arc-extinguishing chamber housing 2, a moving contact 6 mounted at the rear end of the arc-extinguishing chamber in a front-back direction, the operating mechanism of the vacuum circuit breaker is connected to the moving contact 6 in a transmission manner, a moving contact plate 5 mounted at the front end of the moving contact 6 in a front-back direction, and a moving contact spring 3 is provided between the moving contact plate and the moving contact.

[0004] In use, the operating mechanism can move the moving contact forward to the closing position or backward to the opening position. In the closing position, the front end of the moving contact plate contacts the rear end of the stationary contact to conduct electricity, and the moving contact spring is in a compressed state to ensure the contact pressure between the moving contact plate and the stationary contact, thereby ensuring that the current is conducted between the stationary contact, the moving contact plate, and the moving contact. When a circuit fault occurs, the operating mechanism moves the moving contact backward to the opening position, at which point the moving contact plate separates from the stationary contact, thus breaking the circuit.

[0005] The problem with existing vacuum interrupters is that certain faults can lead to contact welding. Contact welding refers to the possibility of "adhesion" between the moving and stationary contacts under specific fault conditions. For example, when an extremely high short-circuit current occurs, the instantaneous current flowing through the contacts is very large. At the moment of opening, the high-temperature arc will cause the contact material to melt locally. If the opening force is insufficient to quickly clear the arc and melted material, the moving and stationary contacts will not be able to open smoothly, which can lead to a serious circuit safety accident. Utility Model Content

[0006] The purpose of this invention is to provide an arc-extinguishing chamber that reduces the "adhesion" phenomenon between the moving and stationary contacts by increasing the opening force.

[0007] The technical solution of this utility model is as follows: A vacuum interrupter includes an interrupter housing, a stationary contact fixed at the front end of the interrupter housing, a movable contact mounted at the rear end of the interrupter housing in a front-rear direction, a movable contact piece mounted at the front end of the movable contact in a front-rear direction, a movable contact spring disposed between the movable contact piece and the movable contact, a stationary contact guide rod extending along the front-rear direction at the rear end of the stationary contact, a conductive sleeve connected to the stationary contact guide rod, a stationary contact piece fixed at the front end of the conductive sleeve for contacting and engaging with the movable contact piece, a stationary contact spring disposed between the stationary contact and the stationary contact piece, both the stationary contact spring and the movable contact spring being compression springs, and a ball-head structure at the rear end of the stationary contact guide rod for contacting and engaging with the rear end of the conductive sleeve.

[0008] Furthermore, the rear end of the conductive sleeve has a conductive sleeve end plate, and the rear end of the ball head structure is used to make point contact with the front end of the conductive sleeve end plate, and the stationary contact piece is fixed on the rear end surface of the conductive sleeve end plate.

[0009] Furthermore, there are multiple stationary contact springs, which are evenly distributed around the conductive sleeve. The front end of the stationary contact spring is fixed to the rear end of the stationary contact, and the rear end of the stationary contact spring is fixed to the contact plate of the stationary contact.

[0010] Furthermore, the rear end of the stationary contact also has a stationary contact guide sleeve located around the stationary contact guide rod. The inner wall of the conductive sleeve contacts and guides the outer periphery of the stationary contact guide rod, and the outer wall of the conductive sleeve contacts and guides the inner wall of the stationary contact guide sleeve.

[0011] Furthermore, the stationary contact spring is disposed between the rear end of the stationary contact guide sleeve and the stationary contact piece.

[0012] The beneficial effects of this technical solution are as follows: In use, the moving contact moves forward to achieve closing. During closing, the moving contact piece contacts and conducts electricity with the stationary contact piece. The moving contact spring is in a compressed state, as is the stationary contact spring. The ball-head structure of the stationary contact guide rod contacts and engages with the rear end of the conductive sleeve. The combined action of the moving and stationary contact springs ensures the contact pressure between the moving and stationary contact pieces. The circumferential contact between the conductive sleeve and the stationary contact guide rod ensures conductivity between the stationary contact and the conductive sleeve. Furthermore, the ball-head structure and the rear end of the conductive sleeve... The contact fit results in a very small contact area between the ball head structure and the conductive sleeve, preventing "adhesion" between them. When opening is required, the moving contact moves backward, and the moving contact piece moves backward. If there is a momentary "adhesion" between the moving and stationary contact pieces, the moving contact spring is stretched as the moving contact continues to move backward, and the stationary contact spring is also stretched. The combined effect of the moving and stationary contact springs results in a larger opening force between the stationary and moving contact pieces, reducing the "adhesion" phenomenon between the moving and stationary contact pieces. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the prior art in the background section of this utility model; Figure 2 This is a schematic diagram of the vacuum interrupter in the open state of this utility model; Figure 3 This is a schematic diagram of the vacuum interrupter in the closed state of this utility model; Figure 4 yes Figure 3 A schematic diagram of the structure of the intermediate moving contact during the backward movement from the closed position; In the diagram: 1. Stationary contact; 2. Arc-extinguishing chamber shell; 3. Moving contact spring; 4. Stationary contact guide rod; 5. Moving contact plate; 6. Moving contact; 7. Ball head structure; 8. Conductive sleeve; 9. Conductive sleeve end plate; 10. Stationary contact plate; 11. Stationary contact spring; 12. Stationary contact guide sleeve; 13. Contact plate guide rod. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] The features and performance of this utility model will be further described in detail below with reference to the embodiments.

[0018] A specific embodiment of the vacuum interrupter chamber in this utility model is as follows: Figures 2-4 As shown: The device includes an arc-extinguishing chamber housing 2 whose axis extends in the front-back direction. A stationary contact 1 with an axis extending in the front-back direction is fixed at the front end of the arc-extinguishing chamber housing 2. A moving contact 6 is mounted at the rear end of the arc-extinguishing chamber in the front-back direction. The rear end of the moving contact 6 is connected to an operating mechanism (not shown in the figure) for transmission. The operating mechanism is existing technology. The operating mechanism can drive the moving contact 6 to move forward to achieve closing and drive the moving contact 6 to move backward to achieve opening.

[0019] The front end of the moving contact is provided with a moving contact assembly groove. A contact guide rod 13 is mounted in the moving contact assembly groove in a forward and backward direction. The front end of the contact guide rod 13 is fixed with a moving contact piece 5. The contact guide rod 13 contacts and guides the groove wall of the moving contact assembly groove, and the current flows between the moving contact, the contact guide rod and the moving contact piece.

[0020] Multiple moving contact springs 3 are provided between the moving contact and the moving contact plate. The moving contact springs 3 are compression springs. The multiple moving contact springs are evenly distributed around the periphery of the contact plate guide rod in the circumferential direction. The front end of the moving contact spring 3 is fixedly connected to the moving contact plate, and the rear end of the moving contact spring is fixedly connected to the front end of the moving contact.

[0021] The rear end of the stationary contact 1 has a stationary contact guide rod 4 whose axis extends in the front-rear direction. The rear end of the stationary contact 1 also has a stationary contact guide sleeve 12 located around the stationary contact guide rod. The stationary contact guide sleeve 12 is coaxially arranged with the stationary contact guide rod 4. A conductive sleeve 8 is installed in the annular space between the stationary contact guide rod and the stationary contact guide sleeve in the front-rear direction. The inner wall of the conductive sleeve 8 contacts and guides the outer circumferential surface of the stationary contact guide rod 4, and the outer wall of the conductive sleeve 8 contacts and conducts electricity with the inner wall of the stationary contact guide sleeve 12. This increases the contact conductivity area between the stationary contact 1 and the conductive sleeve 12.

[0022] The conductive sleeve has a conductive sleeve end plate 9 at its rear end, and a stationary contact piece 10 is fixed to the rear end of the conductive sleeve end plate 9. The rear end face of the stationary contact piece 10 is used to contact and cooperate with the front end face of the moving contact piece 5 to realize the closing operation. A stationary contact spring 11 is provided between the stationary contact and the stationary contact piece. The stationary contact spring 11 is a compression spring, and the rear end of the stationary contact guide rod is a ball head structure 7 for contacting and cooperating with the rear end point of the conductive sleeve.

[0023] In this embodiment, there are multiple stationary contact springs 11, which are evenly distributed around the conductive sleeve. The front end of the stationary contact spring 11 is fixed to the rear end of the stationary contact, and the rear end of the stationary contact spring 11 is fixed to the contact piece of the stationary contact.

[0024] like Figure 2 As shown, the moving contact and stationary contact are in the open state, and the moving contact spring and stationary contact spring are in the free state at this time; when a closing operation is required, as... Figure 3 As shown, the moving contact moves towards the stationary contact, and the moving contact piece contacts the stationary contact piece to close the circuit. The moving contact spring and the stationary contact spring are in a compressed state. The ball-head structure makes electrical contact with the conductive sleeve end plate (the contact area between the stationary contact guide rod and the conductive sleeve end plate is very small and can be ignored), preventing the stationary contact guide rod and the conductive sleeve end plate from "sticking" together under forward and backward pressure. The rear end face of the contact piece guide rod does not contact the bottom of the moving contact assembly slot. The stationary contact spring and the moving contact spring ensure the contact pressure of the stationary and moving contact pieces, guaranteeing... Normal current transmission; when a tripping operation is required, the moving contact moves backward, carrying the moving contact piece backward. If the moving contact piece is stuck to the stationary contact piece, the moving contact spring will be stretched. If the moving contact piece and the stationary contact piece are stuck together, the stationary contact spring will also be stretched. The stationary contact spring applies a forward force to the stationary contact piece, and the moving contact spring applies a backward force to the moving contact piece. Through the combined action of the stationary contact spring and the moving contact spring, the stationary contact piece and the moving contact piece are smoothly separated, thus achieving successful tripping.

[0025] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. The patent protection scope of the present utility model shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present utility model shall also be included within the protection scope of the present utility model.

Claims

1. A vacuum interrupter, comprising an interrupter housing, a stationary contact fixed to the front end of the interrupter housing, a movable contact mounted on the rear end of the interrupter housing in a front-rear direction, a movable contact plate mounted on the front end of the movable contact in a front-rear direction, and a movable contact spring disposed between the movable contact plate and the movable contact, characterized in that: The rear end of the stationary contact has a stationary contact guide rod with its axis extending in the front-rear direction. A conductive sleeve is connected to the guide sleeve on the stationary contact guide rod. The front end of the conductive sleeve is fixed with a stationary contact piece for contacting and engaging with the moving contact piece. A stationary contact spring is provided between the stationary contact and the stationary contact piece. Both the stationary contact spring and the moving contact spring are compression springs. The rear end of the stationary contact guide rod is a ball head structure for contacting and engaging with the rear end of the conductive sleeve.

2. The vacuum interrupter according to claim 1, characterized in that: The conductive sleeve has a conductive sleeve end plate at its rear end. The ball-head structure at the rear end is used to make point contact with the front end of the conductive sleeve end plate. The stationary contact piece is fixed to the rear end face of the conductive sleeve end plate.

3. The vacuum interrupter according to claim 2, characterized in that: There are multiple stationary contact springs, which are evenly distributed around the conductive sleeve. The front end of the stationary contact spring is fixed to the rear end of the stationary contact, and the rear end of the stationary contact spring is fixed to the contact plate of the stationary contact.

4. The vacuum interrupter according to claim 3, characterized in that: The rear end of the stationary contact also has a stationary contact guide sleeve located around the stationary contact guide rod. The inner wall of the conductive sleeve contacts and guides the outer periphery of the stationary contact guide rod, and the outer wall of the conductive sleeve contacts and guides the inner wall of the stationary contact guide sleeve.

5. The vacuum interrupter according to claim 4, characterized in that: The stationary contact spring is located between the rear end of the stationary contact guide sleeve and the stationary contact plate.

Images