A contact structure for a vacuum interrupter

Abstract

The utility model relates to the technical field of electric power appliance, concretely relates to a contact structure for vacuum arc extinguishing chamber, include: static contact, moving contact, static conducting rod and moving conducting rod, static conducting rod and moving conducting rod and static contact and moving contact's junction department are equipped with detachable device, the outer wall of static contact is equipped with buffer device. Through buffer device, utilize sliding rod transmission and buffer spring elastic deformation, can absorb the instantaneous impact force when contact switch on, avoid the impact force direct action on contact and conducting rod junction department, and the reinforcing rib has strengthened the connection intensity of buffer device and contact, prevent the component deformation or fall off in the buffering process, guarantee vacuum arc extinguishing chamber stable operation, with the aid of the double design of "screw connection + connecting key constraint", when replacing the contact of abrasion, ablation, need not replace vacuum arc extinguishing chamber whole, only through dismounting the interior hexagonal screw rod, rotates connecting key to realize the separation and assembly of contact and conducting rod.

Description

Technical Field

[0001] This utility model relates to the field of power electrical appliance technology, specifically to a contact structure for a vacuum interrupter. Background Technology

[0002] In the existing vacuum interrupter contact structure, the contacts and conductive rods are mostly fixedly connected without dedicated buffer components. When the circuit is connected, the instantaneous impact force generated by the collision of the moving and stationary contacts acts directly on the connection, which can easily lead to component deformation or loosening. Moreover, when the contacts are worn or burned after long-term use and need to be replaced, the entire interrupter chamber needs to be disassembled, which is complicated and has high maintenance costs.

[0003] Therefore, in response to the above-mentioned shortcomings, this utility model provides a contact structure for a vacuum interrupter. The buffer device absorbs the impact kinetic energy through the elastic deformation of the buffer spring, and the reinforcing rib enhances the connection stability, preventing damage to components from impact forces. The detachable device uses a "threaded connection + connecting key constraint" to achieve convenient disassembly and assembly of the contact and the conductive rod without the need to replace the entire interrupter. This effectively solves the problems of insufficient buffering and inconvenient maintenance in the existing structure, and meets the urgent needs of the power and electrical industry for replaceable and buffering functions of the contact structure of the vacuum interrupter. Utility Model Content

[0004] To address the shortcomings of existing technologies, the technical solution adopted by this utility model is as follows: a contact structure for a vacuum interrupter, comprising: a stationary contact, a moving contact, a stationary conductive rod, and a moving conductive rod. A detachable device is provided at the connection between the stationary and moving conductive rods and the stationary and moving contacts. A buffer device is provided on the outer wall of the stationary contact. The detachable device includes a threaded hole, which is formed on the axial outer wall of the stationary and moving conductive rods. A groove is formed on the outer wall of the connection between the stationary and moving conductive rods and the stationary and moving contacts. A connecting key is rotatably connected to the inner wall of the groove. A threaded hole is formed on the outer wall of the connecting key, and an internal hexagonal screw is threaded onto the inner wall of the threaded hole.

[0005] Preferably, the stationary conductive rod and the moving conductive rod are threadedly connected to the stationary contact and the moving contact, respectively. When the stationary contact or the moving contact needs to be replaced due to wear, burning, or other reasons caused by long-term use, the detachable device, with its detachable constraint design, enables convenient separation and assembly of the contact and the conductive rod. Before replacement, first use an Allen wrench to unscrew the Allen screw on the connecting key to release the tightness of the Allen screw on the connecting key. Since the connecting key is rotatably connected in the groove at the connection point between the stationary conductive rod, the moving conductive rod, and the corresponding contact, after unscrewing the Allen screw, the connecting key can be directly rotated to disengage it from the groove, thereby releasing the radial constraint on the conductive rod and the contact.

[0006] Preferably, the buffer device includes a fixing ring, the outer wall of which is fixedly connected with reinforcing ribs. Since the static conductive rod and the static contact, as well as the moving conductive rod and the moving contact, are all threadedly connected, after the radial constraint is released, the old contact can be unscrewed from the corresponding conductive rod simply by rotating it along the thread direction, thus completing the removal of the old contact.

[0007] Preferably, a sliding rod is slidably connected to the inner wall of the fixing ring, and a buffer spring is fixedly connected to the outer wall of the fixing ring. A pressing plate is fixedly connected to the outer wall of one end of the sliding rod. When installing a new contact, the new contact and the corresponding conductive rod are first screwed together along the thread direction to ensure that the new contact and the conductive rod are initially fixed. Then, the connecting key is rotated in the opposite direction to reset it to the groove at the connection between the conductive rod and the contact. Finally, the internal hexagonal screw is screwed into the threaded hole on the connecting key. The connecting key is tightened through the threaded engagement. With the dual fixing method of "threaded connection + connecting key constraint", the connection between the new contact and the conductive rod is ensured to be firm, avoiding loosening during subsequent use and reducing maintenance difficulty and cost.

[0008] Preferably, the outer wall of the fixed ring is fixedly connected to the outer walls of the stationary contact and the moving contact, respectively, and the outer wall of the reinforcing rib is fixedly connected to the outer walls of the stationary contact and the moving contact, respectively. During the operation of the vacuum interrupter contact structure, the buffer device plays a key role in mitigating the instantaneous impact force when the contacts are connected. It protects the contacts and the conductive rod by absorbing energy through mechanical deformation. The specific working process is as follows: When the moving contact moves towards the stationary contact under external drive to achieve circuit connection, the fixed ring on the outer wall of the moving contact will first contact the extrusion plate on the stationary contact side. At this time, the instantaneous impact force generated by the contact connection will be directly transmitted to the extrusion plate. Under the action of the impact force, the extrusion plate will push the sliding rod to slide axially on the inner wall of the fixed ring. The movement of the sliding rod will further compress the buffer spring fixed on the outer wall of the fixed ring. The buffer spring converts the kinetic energy generated by the instantaneous impact into elastic potential energy through its own elastic deformation, thereby effectively absorbing the impact force and preventing the impact force from acting directly on the connection between the contacts and the conductive rod.

[0009] Preferably, the outer wall of the buffer spring away from the fixed ring is fixedly connected to the outer wall of the extrusion ring, and the fixed ring of the outer wall of the moving contact is in contact with the outer wall of the extrusion plate. At the same time, the fixed ring is fixedly connected to the outer wall of the contact through reinforcing ribs. This structural design can significantly enhance the connection strength between the buffer device and the contact, prevent the components from deforming or falling off due to excessive force during the buffering process, and further ensure the stable operation of the buffer device.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model, by setting up a buffer device, utilizes the sliding rod transmission and the elastic deformation of the buffer spring to absorb the instantaneous impact force when the contacts are connected, avoiding the impact force acting directly on the connection between the contacts and the conductive rod; at the same time, the reinforcing ribs enhance the connection strength between the buffer device and the contacts, preventing the components from deforming or falling off during the buffering process, and ensuring the stable operation of the vacuum interrupter.

[0012] 2. By setting up a detachable device and using the dual design of "threaded connection + connecting key constraint", when replacing worn or ablated contacts, it is not necessary to replace the entire vacuum interrupter. The contacts and conductive rods can be separated and assembled simply by disassembling the internal hexagonal screw and rotating the connecting key. This makes the operation convenient and reduces economic investment. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the back structure of this utility model;

[0015] Figure 3 This is a schematic diagram of the internal structure of this utility model;

[0016] Figure 4 This is a structural schematic diagram of the detachable device of this utility model;

[0017] Figure 5 This is a schematic diagram of the buffer device of this utility model.

[0018] In the diagram: 1. Stationary contact; 2. Moving contact; 3. Stationary conductive rod; 4. Moving conductive rod; 5. Detachable device; 6. Buffer device; 50. Threaded hole; 51. Connecting key; 52. Socket head screw; 60. Retaining ring; 61. Reinforcing rib; 62. Sliding rod; 63. Buffer spring; 64. Extrusion plate. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described to better illustrate the principles and practical applications of the present invention, and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for a particular purpose.

[0020] Example:

[0021] Please see Figure 1 - Figure 5This utility model provides a technical solution: a contact structure for a vacuum interrupter, comprising: a stationary contact 1, a moving contact 2, a stationary conductive rod 3 and a moving conductive rod 4, wherein a detachable device 5 is provided at the connection between the stationary conductive rod 3 and the moving conductive rod 4 and the stationary contact 1 and the moving contact 2, and a buffer device 6 is provided on the outer wall of the stationary contact 1; the detachable device 5 includes a threaded hole 50, which is opened on the axial outer wall of the stationary conductive rod 3 and the moving conductive rod 4, and a groove is opened on the outer wall at the connection between the stationary conductive rod 3 and the moving conductive rod 4 and the stationary contact 1 and the moving contact 2, wherein a connecting key 51 is rotatably connected to the inner wall of the groove, and a threaded hole 50 is opened on the outer wall of the connecting key 51, wherein an internal hexagonal screw 52 is threadedly connected to the inner wall of the threaded hole 50.

[0022] The stationary conductive rod 3 and the moving conductive rod 4 are threadedly connected to the stationary contact 1 and the moving contact 2, respectively. The buffer device 6 includes a fixed ring 60, a reinforcing rib 61 fixedly connected to the outer wall of the fixed ring 60, a sliding rod 62 slidably connected to the inner wall of the fixed ring 60, a buffer spring 63 fixedly connected to the outer wall of the fixed ring 60, and a pressing plate 64 fixedly connected to the outer wall of one end of the sliding rod 62.

[0023] The outer wall of the fixed ring 60 is fixedly connected to the outer walls of the stationary contact 1 and the moving contact 2 respectively. The outer wall of the reinforcing rib 61 is fixedly connected to the outer walls of the stationary contact 1 and the moving contact 2 respectively. The outer wall of the buffer spring 63 away from the fixed ring 60 is fixedly connected to the outer wall of the extrusion ring. The fixed ring 60 on the outer wall of the moving contact 2 is in contact with the outer wall of the extrusion plate 64.

[0024] Working principle:

[0025] During the operation of the vacuum interrupter contact structure, the buffer device 6 plays a crucial role in mitigating the instantaneous impact force during contact connection. It protects the contacts and conductive rod through mechanical deformation energy absorption. The specific working process is as follows: When the moving contact 2 moves towards the stationary contact 1 under external drive to connect the circuit, the fixing ring 60 on the outer wall of the moving contact 2 first contacts the pressing plate 64 on the side of the stationary contact 1. At this time, the instantaneous impact force generated by the contact connection is directly transmitted to the pressing plate 64. Under the action of the impact force, the pressing plate 64 pushes the sliding rod 62 to slide axially along the inner wall of the fixing ring 60. The movement of the sliding rod 62 further compresses the buffer spring 63 fixed on the outer wall of the fixing ring 60. The buffer spring 63, through its own elastic deformation, converts the kinetic energy generated by the instantaneous impact into elastic potential energy, thereby effectively absorbing the impact force and preventing the impact force from directly acting on the connection between the contacts and the conductive rod.

[0026] Meanwhile, the fixing ring 60 is fixedly connected to the outer wall of the contact through the reinforcing rib 61. This structural design can significantly enhance the connection strength between the buffer device 6 and the contact, prevent the component from deforming or falling off due to excessive force during the buffering process, and further ensure the stable operation of the buffer device 6.

[0027] When the stationary contact 1 or the moving contact 2 needs to be replaced due to wear, burning, or other reasons caused by long-term use, the detachable device 5, with its detachable constraint design, enables convenient separation and assembly of the contact and the conductive rod. Before replacement, first use an Allen wrench to unscrew the Allen screw 52 on the connecting key 51 to release the fastening effect of the Allen screw 52 on the connecting key 51. Since the connecting key 51 is rotatably connected in the groove at the connection point between the stationary conductive rod 3, the moving conductive rod 4, and the corresponding contact, after unscrewing the Allen screw 52, ​​the connecting key 51 can be directly rotated to disengage it from the groove, thereby releasing the radial constraint on the conductive rod and the contact.

[0028] Since the stationary conductive rod 3 and the stationary contact 1, and the moving conductive rod 4 and the moving contact 2 are all threaded connections, after releasing the radial constraint, the old contact can be unscrewed from the corresponding conductive rod simply by rotating it along the thread direction, thus completing the removal of the old contact. When installing the new contact, first screw the new contact and the corresponding conductive rod along the thread direction to ensure that the new contact and the conductive rod are initially fixed. Then, rotate the connecting key 51 in the opposite direction to reset it to the groove at the connection between the conductive rod and the contact. Finally, screw the internal hexagonal screw 52 into the threaded hole 50 on the connecting key 51. The connecting key 51 is tightened through the threaded engagement. With the dual fixing method of "threaded connection + connecting key 51 constraint", the connection between the new contact and the conductive rod is ensured to be firm, avoiding loosening during subsequent use and reducing maintenance difficulty and cost.

[0029] Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art and related fields based on the embodiments of this utility model without creative effort should fall within the protection scope of this utility model. Structures, devices, and operating methods not specifically described and explained in this utility model, unless otherwise specified or limited, shall be implemented according to conventional means in the art.

Claims

1. A contact structure for a vacuum interrupter, comprising: A stationary contact (1), a moving contact (2), a stationary conductive rod (3) and a moving conductive rod (4), characterized in that a detachable device (5) is provided at the connection between the stationary conductive rod (3) and the moving conductive rod (4) and the stationary contact (1) and the moving contact (2), and a buffer device (6) is provided on the outer wall of the stationary contact (1). The detachable device (5) includes a threaded hole (50), which is opened on the axial outer wall of the stationary conductive rod (3) and the moving conductive rod (4). The outer wall of the connection between the stationary conductive rod (3) and the moving conductive rod (4) and the stationary contact (1) and the moving contact (2) is provided with a groove. The inner wall of the groove is rotatably connected with a connecting key (51). The outer wall of the connecting key (51) is provided with a threaded hole (50). The inner wall of the threaded hole (50) is threaded with an internal hexagonal screw (52).

2. The contact structure for a vacuum interrupter according to claim 1, characterized in that: The stationary conductive rod (3) and the moving conductive rod (4) are threadedly connected to the stationary contact (1) and the moving contact (2), respectively.

3. The contact structure for a vacuum interrupter according to claim 1, characterized in that: The buffer device (6) includes a fixing ring (60), and the outer wall of the fixing ring (60) is fixedly connected with a reinforcing rib (61).

4. The contact structure for a vacuum interrupter according to claim 3, characterized in that: The inner wall of the fixed ring (60) is slidably connected to the sliding rod (62), the outer wall of the fixed ring (60) is fixedly connected to the buffer spring (63), and one end of the outer wall of the sliding rod (62) is fixedly connected to the extrusion plate (64).

5. A contact structure for a vacuum interrupter according to claim 3, characterized in that: The outer wall of the fixed ring (60) is fixedly connected to the outer walls of the stationary contact (1) and the moving contact (2), respectively, and the outer wall of the reinforcing rib (61) is fixedly connected to the outer walls of the stationary contact (1) and the moving contact (2), respectively.

6. A contact structure for a vacuum interrupter according to claim 4, characterized in that: The outer wall of the buffer spring (63) away from the fixed ring (60) is fixedly connected to the outer wall of the extrusion ring, and the fixed ring (60) of the outer wall of the moving contact (2) is in contact with the outer wall of the extrusion plate (64).

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