Vacuum switch tube contact structure

Abstract

The utility model discloses a vacuum switch tube contact structure comprising a housing, two ends in the housing are movably connected with a first conductive rod and a second conductive rod, and the interior of one end, close to the second conductive rod, of the first conductive rod and the interior of one end, close to the first conductive rod, of the second conductive rod are respectively provided with a buffer assembly. The first conducting rod and the second conducting rod are connected with the contact through a buffer assembly. In the process that the vacuum arc-extinguishing chamber executes current connection, the first conducting rod and the second conducting rod can collide with each other at the same time with equivalent impact quantity so as to drive the two contacts to collide with each other, and the impact force of the two contacts counteracts each other due to the fact that the movement directions of the two contacts are opposite. The vibration of the vacuum switch during operation is greatly reduced, and the impact of the two contacts can be buffered under the cooperation of the buffer assembly, so that the vibration of the vacuum switch can be greatly reduced, and the protection of the vacuum switch is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum switch tubes, in particular to a contact structure of a vacuum switch tube. Background Art

[0002] A vacuum switch tube, also known as a vacuum interrupter, is an essential core component of a vacuum circuit breaker. Especially when applied in high-voltage circuits, the vacuum switch tube uses high vacuum as the insulating medium, enabling the high-voltage circuit to quickly extinguish the arc and suppress the current after cutting off the power supply, avoiding accidents and unexpected situations, and thus requires a very high insulation strength. The vacuum switch tube is completed by a driving mechanism located outside the vacuum switch tube to close and separate a pair of oppositely arranged contacts in the vacuum interrupter. It has a pair of moving and static contacts inside, the static contact is fixed on the static conductive rod, and the moving contact is fixed on the moving conductive rod. A bellows is sealed between the moving conductive rod and the metal cover plate, and the moving conductive rod can move axially to drive the contacts to complete the closing and separating actions.

[0003] Currently, when the vacuum switch tube is closed, it relies on the moving contact to move towards the static contact. When the moving contact contacts the static contact, the impact force of the moving contact is relatively large, resulting in violent vibration of the vacuum switch tube, which affects the service life of the vacuum switch tube. Therefore, a contact structure of a vacuum switch tube needs to be designed. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the deficiencies existing in the prior art, and a contact structure of a vacuum switch tube is proposed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a contact structure of a vacuum switch tube, including a housing, both ends inside the housing are movably connected with a first conductive rod and a second conductive rod, buffer components are arranged inside the first conductive rod near one end of the second conductive rod and inside the second conductive rod near one end of the first conductive rod, both the first conductive rod and the second conductive rod are connected with the contact through the buffer components, and transmission components are arranged on the circumferential surfaces of the first conductive rod and the second conductive rod.

[0006] As a further description of the above technical scheme:

[0007] The buffer component includes a circular groove, a compression spring and a sliding rod. Circular grooves are opened at one end of the first conductive rod near the second conductive rod and at one end of the second conductive rod near the first conductive rod. A compression spring is fixedly connected inside the circular groove, a sliding rod is slidably connected inside the circular groove, one end of the sliding rod is fixedly connected with the compression spring, and the other end of the sliding rod is fixedly connected with the contact.

[0008] As a further description of the above technical scheme:

[0009] The transmission assembly includes a moving cylinder, a first retaining ring, and a second retaining ring. One end of the contact head close to the sliding rod is fixedly connected to the moving cylinder. The first retaining ring is fixedly connected to the inside of the end of the moving cylinder away from the contact head. The circumferential surfaces of the first conductive rod and the second conductive rod are both fixedly connected to the second retaining ring, and the second retaining ring cooperates with the first retaining ring.

[0010] As a further description of the above technical solution:

[0011] An elastic sheet is fixedly connected inside the housing. There are two elastic sheets, which are symmetrically distributed inside the housing. The first conductive rod and the second conductive rod respectively penetrate through the two elastic sheets and are fixedly connected to the elastic sheets.

[0012] As a further description of the above technical solution:

[0013] Guide sleeves are fixedly connected to the inner parts of both ends of the housing. The two guide sleeves are respectively slidably connected to the first conductive rod and the second conductive rod.

[0014] As a further description of the above technical solution:

[0015] Bellows are fixedly connected to both ends of the housing. The ends of the two bellows away from the housing are respectively fixedly connected to the first conductive rod and the second conductive rod.

[0016] The present utility model has the following beneficial effects:

[0017] Compared with the prior art, in the contact structure of the vacuum switch tube of this kind, by setting the first conductive rod, the second conductive rod, and the buffer assembly, during the process of current connection in the vacuum interrupter, the first conductive rod and the second conductive rod can collide with each other with a relatively large impact force at the same time, thereby driving the two contact heads to collide. Since the moving directions of the two contact heads are opposite, the impact forces of the two contact heads cancel each other out at this time, greatly reducing the vibration of the vacuum switch during operation. At the same time, with the cooperation of the buffer assembly, the impact of the two contact heads can be buffered again, thus greatly reducing the vibration of the vacuum switch, thereby improving the protection of the vacuum switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an overall structural schematic diagram of a contact structure of a vacuum switch tube proposed by the present utility model;

[0019] Figure 2 is an internal structural schematic diagram of a contact structure of a vacuum switch tube proposed by the present utility model;

[0020] Figure 3 is a contact structure of a vacuum switch tube proposed by the present utility model Figure 2 partial enlarged view of part A;

[0021] Figure 4 A contact structure of a vacuum switch tube proposed by the present utility model Figure 2 The enlarged view of part B in it.

[0022] Legend description:

[0023] 1. Housing; 2. First conductive rod; 3. Second conductive rod; 4. Bellows; 5. Elastic sheet; 6. Buffer assembly; 601. Circular groove; 602. Compression spring; 603. Sliding rod; 7. Transmission assembly; 701. Moving cylinder; 702. First retaining ring; 703. Second retaining ring; 8. Contact; 9. Guide sleeve. Specific implementation manner

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present utility model.

[0025] Referring to Figures 1-4 , a contact structure of a vacuum switch tube provided by the present utility model includes a housing 1. Both ends inside the housing 1 are movably connected with a first conductive rod 2 and a second conductive rod 3. A buffer assembly 6 is provided inside both ends of the first conductive rod 2 close to the second conductive rod 3 and inside both ends of the second conductive rod 3 close to the first conductive rod 2. Both the first conductive rod 2 and the second conductive rod 3 are connected to the contact 8 through the buffer assembly 6. Transmission assemblies 7 are provided on the circumferential surfaces of the first conductive rod and the second conductive rod.

[0026] Specifically, during the process of current connection in the vacuum interrupter, the first conductive rod 2 and the second conductive rod 3 can collide with each other with a considerable impact force at the same time, thereby driving the two contacts 8 to collide. Since the moving directions of the two contacts 8 are opposite, the impact forces of the two contacts 8 cancel each other out at this time, greatly reducing the vibration of the vacuum switch during operation. At the same time, with the cooperation of the buffer assembly 6, the impact of the two contacts 8 can be buffered again, thus greatly reducing the vibration of the vacuum switch, thereby improving the protection of the vacuum switch; during the process of current disconnection in the vacuum interrupter, the first conductive rod 2 and the second conductive rod 3 move in opposite directions at the same speed at the same time. At this time, with the cooperation of the transmission assembly 7, it is convenient to drive the two contacts 8 to separate, so as to achieve the purpose of power off.

[0027] The buffer assembly 6 includes a circular groove 601, a compression spring 602 and a sliding rod 603. Circular grooves 601 are provided at one end of the first conductive rod 2 close to the second conductive rod 3 and one end of the second conductive rod 3 close to the first conductive rod 2. A compression spring 602 is fixedly connected inside the circular groove 601, and a sliding rod 603 is slidably connected inside the circular groove 601. One end of the sliding rod 603 is fixedly connected to the compression spring 602, and the other end of the sliding rod 603 is fixedly connected to the contact 8. During operation, when the first conductive rod 2 and the second conductive rod 3 move towards each other, when the two contacts 8 come into contact, the sliding rod 603 will be squeezed to move inside the circular groove 601, thereby compressing the compression spring 602. Under the action of the compression spring 602, the purpose of buffering can be achieved, avoiding violent vibration caused by the collision of the two contacts 8, thus improving the protection of the vacuum switch.

[0028] The transmission assembly 7 includes a moving cylinder 701, a first retaining ring 702 and a second retaining ring 703. One end of the contact 8 close to the sliding rod 603 is fixedly connected to the moving cylinder 701. A first retaining ring 702 is fixedly connected inside the end of the moving cylinder 701 away from the contact 8. Second retaining rings 703 are fixedly connected to the circumferential surfaces of the first conductive rod 2 and the second conductive rod 3. The second retaining ring 703 cooperates with the first retaining ring 702. During operation, when the first conductive rod 2 and the second conductive rod 3 move in opposite directions, when the second retaining ring 703 contacts the first retaining ring 702, the contact 8 can be driven to move under the cooperation of the moving cylinder 701, so as to facilitate the separation of the two contacts 8 to achieve the purpose of power-off.

[0029] Elastic sheets 5 are fixedly connected inside the housing 1. There are two elastic sheets 5, and they are symmetrically distributed inside the housing 1. The first conductive rod 2 and the second conductive rod 3 respectively penetrate the two elastic sheets 5 and are fixedly connected to the elastic sheets 5. During operation, when the first conductive rod 2 and the second conductive rod 3 move, the elastic sheets 5 can be driven to deform. When the deformation amount of the elastic sheet 5 is greater than the yield point of the elastic sheet 5, the elastic sheet 5 instantly changes from bending upward to bending downward, or the elastic sheet 5 instantly changes from bending downward to bending upward, so as to facilitate driving the two contacts 8 to quickly contact or quickly separate, effectively avoiding the generation of electric arcs due to insufficient speed when the two contacts 8 contact and separate, and ensuring the working safety of the contact 8 structure.

[0030] Guide sleeves 9 are fixedly connected to both ends inside the housing 1. The two guide sleeves 9 are respectively slidably connected to the first conductive rod 2 and the second conductive rod 3. During operation, by providing the guide sleeves 9, the movement of the first conductive rod 2 and the second conductive rod 3 can be limited respectively under the action of the guide sleeves 9, so that the first conductive rod 2 and the second conductive rod 3 can move stably.

[0031] Both ends of the housing 1 are fixedly connected with bellows 4. The ends of the two bellows 4 away from the housing 1 are respectively fixedly connected with the first conductive rod 2 and the second conductive rod 3. During operation, by arranging the bellows 4, the protection of the first conductive rod 2 and the second conductive rod 3 can be improved under the action of the bellows 4.

[0032] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum switch tube contact structure, comprising a housing (1), characterized in that: The first conductive rod (2) and the second conductive rod (3) are movably connected at both ends of the housing (1); a buffer assembly (6) is provided inside the first conductive rod (2) close to one end of the second conductive rod (3) and inside the second conductive rod (3) close to one end of the first conductive rod (2); the first conductive rod (2) and the second conductive rod (3) are connected to the contact (8) via the buffer assembly (6); and a transmission assembly (7) is provided on the circumferential surfaces of the first conductive rod and the second conductive rod; The buffer assembly (6) comprises a circular groove (601), a compression spring (602) and a sliding rod (603); an end of the first conductive rod (2) close to the second conductive rod (3) and an end of the second conductive rod (3) close to the first conductive rod (2) are both provided with a circular groove (601); a compression spring (602) is fixedly connected inside the circular groove (601); a sliding rod (603) is slidably connected inside the circular groove (601); one end of the sliding rod (603) is fixedly connected to the compression spring (602); and the other end of the sliding rod (603) is fixedly connected to the contact (8); The transmission assembly (7) comprises a moving cylinder (701), a first retaining ring (702) and a second retaining ring (703); the moving cylinder (701) is fixedly connected to one end of the contact (8) close to the sliding rod (603); the first retaining ring (702) is fixedly connected to the inside of the moving cylinder (701) away from the contact (8); the second retaining ring (703) is fixedly connected to the circumferential surfaces of the first conductive rod (2) and the second conductive rod (3); and the second retaining ring (703) cooperates with the first retaining ring (702).

2. A vacuum switch tube contact structure according to claim 1, characterized in that: An elastic sheet (5) is fixedly connected inside the shell (1); two elastic sheets (5) are provided and symmetrically distributed inside the shell (1); the first conductive rod (2) and the second conductive rod (3) respectively penetrate the two elastic sheets (5) and are fixedly connected to the elastic sheets (5).

3. A vacuum switch tube contact structure according to claim 1, characterized in that: Guide sleeves (9) are fixedly connected inside both ends of the housing (1), and the two guide sleeves (9) are slidably connected to the first conductive rod (2) and the second conductive rod (3) respectively.

4. A vacuum switch tube contact structure according to claim 1, characterized in that: Both ends of the housing (1) are fixedly connected to bellows (4), and the ends of the two bellows (4) away from the housing (1) are fixedly connected to the first conductive rod (2) and the second conductive rod (3), respectively.

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