An improved vacuum interrupter

Abstract

The present invention relates to the technical field of vacuum interrupters, and particularly discloses an improved vacuum interrupter, which includes an insulating shell, a static contact, and a movable dynamic contact: a bellows and a shielding cylinder are located inside the insulating shell. The bellows is sleeved outside the dynamic contact. A first solder ring is welded to seal the gap between one end of the bellows and the insulating shell. A second solder ring is welded to seal the gap between the other end of the bellows and the dynamic contact. The shielding cylinder is sleeved around the outside of the first contact and the outside of the second contact. A third solder ring is welded to the shielding cylinder and the insulating shell. A fourth solder ring is welded to seal the gap between the static contact and the insulating shell. By means of the settings of the first solder ring, the second solder ring, and the fourth solder ring, the welding and sealing of the first contact, the second contact, and the insulating shell are realized, fully ensuring the vacuum tightness of the first contact and the second contact. By means of the setting of the third solder ring, the stable connection between the shielding cylinder and the insulating shell is realized, fully ensuring the electromagnetic shielding performance of the first contact and the second contact.

Description

Technical Field

[0001] The present invention relates to the technical field of vacuum interrupters, and in particular discloses an improved vacuum interrupter. Background Art

[0002] The vacuum switch tube, also known as the vacuum interrupter, is the core component of medium and high voltage power switches. Its main function is to quickly extinguish the arc and suppress the current after the medium and high voltage circuit cuts off the power through the excellent insulation of the vacuum inside the tube, avoiding accidents and unexpected situations. It is mainly applied to the power transmission and distribution control system, and also applied to the distribution systems such as metallurgy, mines, petroleum, chemical industry, railways, broadcasting, communications, and industrial high-frequency heating. It has the characteristics of energy saving, material saving, fire prevention, explosion prevention, small volume, long life, low maintenance cost, reliable operation, and no pollution. The vacuum interrupter is divided into an interrupter for circuit breakers and an interrupter for load switches according to its use. The interrupter for circuit breakers is mainly used in substations and grid facilities in the power sector, and the interrupter for load switches is mainly used for end-users of the grid.

[0003] The vacuum interrupter requires the terminals to be located in the vacuum-sealed space. In the prior art, the structural design of the vacuum interrupter is unreasonable, and the vacuum interrupter often has poor use due to vacuum leakage. In addition, the structural design of the vacuum interrupter in the prior art is unreasonable. On the one hand, it has poor use due to external electromagnetic interference, and on the other hand, it prevents the use of the vacuum interrupter from interfering with external electronic products. Summary of the Invention

[0004] In order to overcome the disadvantages and deficiencies existing in the prior art, the purpose of the present invention is to provide an improved vacuum interrupter. By means of the settings of the first solder ring, the second solder ring, and the fourth solder ring, the first contact, the second contact, and the insulating shell are welded and sealed, fully ensuring the vacuum tightness of the first contact and the second contact. By means of the setting of the third solder ring, the shielding cylinder and the insulating shell are firmly connected, fully ensuring the electromagnetic shielding performance of the first contact and the second contact.

[0005] To achieve the above-mentioned purpose, an improved vacuum arc extinguishing chamber of the present invention comprises an insulating shell, a static contact arranged at one end of the insulating shell, and a moving contact movably arranged at the other end of the insulating shell, one end of the static contact is provided with a first contact located in the insulating shell, and the moving contact is provided with a second contact located in the insulating shell, the first contact is used to connect or disconnect the second contact, and the other end of the static contact and the other end of the moving contact are respectively used to connect two conductors of the outside world; it also includes a bellows, a shielding tube, a first solder ring, a second solder ring, a third solder ring and a fourth solder ring, the bellows and the shielding tube are located in the insulating shell, the bellows is sleeved on the outside of the moving contact, the first solder ring and the second solder ring are arranged around the moving contact, the first solder ring is used to weld and seal the gap between one end of the bellows and the insulating shell, and the second solder ring is used to weld and seal the gap between the other end of the bellows and the moving contact; the shielding tube is sleeved around the outside of the first contact and the outside of the second contact, the third solder ring is used to weld the shielding tube and the insulating shell; the fourth solder ring is used to weld and seal the gap between the static contact and the insulating shell.

[0006] Among them, the insulating shell includes a first end cover, a second end cover, a center tube, a fifth solder ring, and a sixth solder ring. The fifth solder ring is welded to seal the first end cover and one end of the center tube, the sixth solder ring is welded to seal the second end cover and the other end of the center tube, and the third solder ring is welded to weld the center tube and the shielding tube; the moving contact is slidably arranged on the first end cover, the moving contact passes through the first end cover, the moving contact and the static contact are collinearly arranged, the first solder ring is welded to seal one end of the bellows and the first end cover; the static contact is arranged on the second end cover, the static contact passes through the second end cover, and the fourth solder ring is welded to seal the static contact and the second end cover.

[0007] The bellows comprises a bellows body and a first protruding ring arranged at one end of the bellows body, wherein the first protruding ring is arranged around the moving contact; the insulating shell is provided with a first blind groove for accommodating the first protruding ring, and the first solder ring is located in the first blind groove.

[0008] Among them, the moving contact has a disc body, which is arranged around the central axis of the moving contact, and the disc body has a second blind groove surrounding the central axis of the moving contact; the bellows includes a second protrusion ring arranged at the other end of the corrugated body, the second protrusion ring is arranged around the moving contact, the second protrusion ring is accommodated in the second blind groove, and the second solder ring is used for welding and sealing the second protrusion ring and the disc body.

[0009] Among them, the insulating shell is provided with a third blind groove, the third blind groove is recessed from the inner surface of the insulating shell, and the third blind groove is arranged around the central axis of the insulating shell; the shielding tube is provided with a third protruding ring, the third protruding ring is arranged around the central axis of the shielding tube, the third protruding ring is accommodated in the third blind groove, the inner side surface of the third blind groove is used to stop and resist the third protruding ring, and the third solder ring is located in the third blind groove.

[0010] Among them, the static contact is provided with a fourth protrusion ring, which is arranged around the central axis of the static contact; the insulating shell is provided with a fourth blind groove, which is recessed from the outer surface of the insulating shell, the fourth protrusion ring is immersed in the fourth blind groove, and the bottom wall of the fourth blind groove is used to stop and resist the fourth protrusion ring; the fourth solder ring is located in the fourth blind groove, and the fourth solder ring is located between the fourth protrusion ring and the bottom wall of the fourth blind groove.

[0011] Among them, the moving contact is provided with a non-circular part, the insulating shell is provided with a non-circular hole for accommodating the non-circular part, the non-circular part is slidably accommodated in the non-circular hole, and the inner hole surface of the non-circular hole is used to stop and resist the outer surface of the non-circular part; the other end of the static contact is located outside the insulating shell and is provided with an internal threaded hole for accommodating a conductor; the other end of the moving contact is located outside the insulating shell and is provided with an external threaded part for conducting another conductor.

[0012] Among them, the first contact and the second contact both include a main body part and a flat plate part connected to the main body part, the flat plate part of the first contact is used to turn on or off the flat plate part of the second contact; the main body part is provided with a blind hole, the flat plate part is used to cover the opening of the blind hole, the main body part is provided with a plurality of arc-shaped grooves, the arc-shaped grooves penetrate the side wall of the main body part, the arc-shaped grooves extend along the central axis of the main body part and along the circumferential direction of the main body part, and the plurality of arc-shaped grooves are arranged around the central axis of the main body part; the flat plate part is provided with a plurality of straight grooves penetrating the flat plate part, the plurality of straight grooves are arranged around the central axis of the flat plate part, and the plurality of straight grooves are respectively connected to the plurality of arc-shaped grooves.

[0013] Among them, the first contact and the second contact also include a support ring located in the blind hole, the two ends of the support ring are respectively welded to the flat plate part and the bottom wall of the blind hole, and the straight groove body connects the gap between the support ring and the inner side surface of the blind hole; the flat plate part has a center hole that passes through the flat plate part, and the center hole is used to connect the inner hole of the support ring.

[0014] The first contact and the second contact further include a seventh solder ring, the seventh solder ring is located between the main body portion and the flat plate portion, and the main body portion and the flat plate portion are welded together via the fourth solder ring.

[0015] The beneficial effects of the present invention are as follows: by means of the setting of the first solder ring, the second solder ring and the fourth solder ring, the welding seal of the first contact, the second contact and the insulating shell is achieved, and the vacuum sealing of the first contact and the second contact is fully guaranteed; by means of the setting of the third solder ring, a stable connection between the shielding tube and the insulating shell is achieved, and the electromagnetic shielding performance of the first contact and the second contact is fully guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 A schematic diagram of a three-dimensional structure from another viewing angle of the present invention;

[0018] Figure 3 Schematic diagram of the decomposition structure of the present invention;

[0019] Figure 4 Schematic diagram of the decomposition structure of the present invention from another perspective;

[0020] Figure 5 Schematic diagram of the decomposition structure of the first contact or the second contact of the present invention.

[0021] Reference numerals include:

[0022] 1 - Insulating housing 2 - Stationary contact 3 - Moving contact

[0023] 4 - First contact 5 - Second contact 6 - Bellows

[0024] 7 - Shielding cylinder 8 - First solder ring 9 - Second solder ring

[0025] 11 - Third solder ring 12 - Fourth solder ring 13 - First end cap

[0026] 14 - Second end cap 15 - Central cylinder 16 - Fifth solder ring

[0027] 17 - Sixth solder ring 18 - First blind groove 19 - Disc body

[0028] 21 - Second blind groove 22 - Fourth protrusion ring 23 - Fourth blind groove

[0029] 24 - Non - circular part 25 - Non - circular hole 26 - Internal threaded hole

[0030] 27 - External threaded part 28 - Body part 29 - Flat plate part

[0031] 31 - Blind hole 32 - Arc - shaped groove body 33 - Straight - strip groove body

[0032] 34 - Support ring 35 - Seventh solder ring 36 - Solder sheet

[0033] 37 - Positioning post 38 - Central hole 39 - Inner hole

[0034] 71 - Third protrusion ring. Specific embodiments

[0035] For the convenience of those skilled in the art to understand, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the embodiments does not limit the present invention.

[0036] Please refer to Figures 1 to 5As shown in the figure, an improved vacuum interrupter of the present invention includes an insulating shell 1, a static contact 2 installed at one end of the insulating shell 1, and a moving contact 3 movably arranged at the other end of the insulating shell 1. One end of the static contact 2 is provided with a first contact 4 located inside the insulating shell 1, and one end of the moving contact 3 is provided with a second contact 5 located inside the insulating shell 1. The first contact 4 is used to conduct or disconnect the second contact 5, and the other ends of the static contact 2 and the moving contact 3 are respectively used to conduct two conductors in the outside world.

[0037] The improved vacuum interrupter further includes a bellows 6, a shielding cylinder 7, a first solder ring 8, a second solder ring 9, a third solder ring 11 and a fourth solder ring 12. The solder rings are circular. The bellows 6 and the shielding cylinder 7 are both located inside the insulating shell 1. The bellows 6 is sleeved outside the moving contact 3, and the first solder ring 8 and the second solder ring 9 are both arranged around the moving contact 3.

[0038] The first solder ring 8 is used to weld and seal the gap between one end of the bellows 6 and the insulating shell 1, that is, the first solder ring 8 welds one end of the bellows 6 and the insulating shell 1 together, and the first solder ring 8 seals the gap between one end of the bellows 6 and the insulating shell 1. The second solder ring 9 is used to weld and seal the gap between the other end of the bellows 6 and the moving contact 3, that is, the second solder ring 9 welds the other end of the bellows 6 and the moving contact 3 together, and the second solder ring 9 seals the gap between the other end of the bellows 6 and the moving contact 3.

[0039] The shielding cylinder 7 is made of a magnetic conductive material. For example, the shielding cylinder 7 is made of a metal material containing iron, cobalt or nickel. The shielding cylinder 7 is sleeved around the outside of the first contact 4 and the outside of the second contact 5, that is, the first contact 4 and the second contact 5 are always located inside the shielding cylinder 7, and the shielding cylinder 7 is used to cover and protect the first contact 4 and the second contact 5. During the conduction process of the first contact 4 and the second contact 5, it is possible to avoid the interference of the external electromagnetic field on the normal signal transmission of the two contacts and ensure the stability of the signal transmission of the two contacts. In addition, the shielding cylinder 7 is used to block the arc generated when the first contact 4 and the second contact 5 are conducting or disconnecting, and avoid the arc from leaking out and radiating to the insulating shell 1, resulting in damage to the insulating shell 1.

[0040] The third solder ring 11 is used to weld the shielding cylinder 7 and the insulating shell 1. By welding the shielding cylinder 7 and the insulating shell 1, the shielding cylinder 7 and the insulating shell 1 are firmly installed together, avoiding the displacement of the shielding cylinder 7 and resulting in poor use. The fourth solder ring 12 is used to weld and seal the gap between the static contact 2 and the insulating shell 1, that is, the fourth solder ring 12 is used to weld the static contact 2 and the insulating shell 1 together to ensure their firm connection; the first solder ring 8 is used to seal the gap between the static contact 2 and the insulating shell 1 to avoid air leakage between the two and resulting in poor use.

[0041] With the arrangements of the first solder ring 8, the second solder ring 9, and the fourth solder ring 12, the first contact 4, the second contact 5, and the insulating housing 1 are welded and sealed, fully ensuring the vacuum tightness of the first contact 4 and the second contact 5; with the arrangement of the third solder ring 11, a firm connection between the shielding cylinder 7 and the insulating housing 1 is achieved, fully ensuring the electromagnetic shielding performance of the first contact 4 and the second contact 5.

[0042] The insulating housing 1 includes a first end cover 13, a second end cover 14, a central cylinder 15, a fifth solder ring 16, and a sixth solder ring 17. In this embodiment, the end covers are made of a metal material. For example, the end covers are made of a copper alloy, and the central cylinder 15 is made of a ceramic material. For example, the central cylinder 15 is made of a white porcelain ceramic material. The fifth solder ring 16 welds and seals one end of the first end cover 13 and the central cylinder 15, and the sixth solder ring 17 welds and seals the other end of the second end cover 14 and the central cylinder 15. The third solder ring 11 welds the central cylinder 15 and the shielding cylinder 7. Preferably, the middle part of the shielding cylinder 7 is welded to the inner wall of the middle part of the central cylinder 15.

[0043] The moving contact 3 is slidably arranged on the first end cover 13. The moving contact 3 penetrates through the first end cover 13. The moving contact 3 and the static contact 2 are collinearly arranged. The first solder ring 8 welds and seals one end of the bellows 6 and the first end cover 13; the static contact 2 is fixedly arranged on the second end cover 14. The static contact 2 penetrates through the second end cover 14. The fourth solder ring 12 welds and seals the static contact 2 and the second end cover 14.

[0044] The bellows 6 includes a corrugated body and a first protruding ring arranged at one end of the corrugated body. The corrugated body and the first protruding ring are of an integral structure. The first protruding ring surrounds the moving contact 3; the first end cover 13 of the insulating housing 1 is provided with a first blind groove 18 for accommodating the first protruding ring. The first solder ring 8 is located in the first blind groove 18.

[0045] On the one hand, the side wall of the first blind groove 18 protects the first protruding ring and the first solder ring 8, reducing the probability of the first protruding ring and the first solder ring 8 being touched. On the other hand, when the first solder ring 8 melts to form solder liquid, the solder liquid flows in the first blind groove 18 to fully fill the gap between the first protruding ring and the first end cover 13. After the solder liquid of the first solder ring 8 cools and solidifies, the first protruding ring and the first end cover 13 can be firmly welded together.

[0046] The moving contact 3 has a disc body 19. The disc body 19 is generally a circular flat plate. The disc body 19 is arranged around the central axis of the moving contact 3. The disc body 19 has a second blind groove 21 around the central axis of the moving contact 3; the bellows 6 includes a second protruding ring arranged at the other end of the corrugated body. The second protruding ring surrounds the moving contact 3. The second protruding ring is accommodated in the second blind groove 21. The second solder ring 9 is used to weld and seal the second protruding ring and the disc body 19.

[0047] On the one hand, the side walls of the second blind groove 21 are used to protect the second protruding ring and the second solder ring 9, reducing the probability of damage to both due to external contact. On the other hand, after the second solder ring 9 melts to form solder liquid, the solder liquid flows in the second blind groove 21 to fully fill the gap between the second protruding ring and the disc body 19. After the solder liquid of the second solder ring 9 cools and solidifies, the second protruding ring and the disc body 19 can be firmly welded together.

[0048] A third blind groove is provided on the central cylinder 15 of the insulating shell 1. The third blind groove is recessed from the inner surface of the middle part of the central cylinder 15 and from the inner surface of the insulating shell 1, and the third blind groove is arranged around the central axis of the insulating shell 1. A third protruding ring 71 is provided on the shielding cylinder 7. The third protruding ring 71 is arranged around the central axis of the shielding cylinder 7, and the third protruding ring 71 is received in the third blind groove. The inner side surface of the third blind groove is used to block and contact the third protruding ring 71, thereby limiting the third protruding ring 71 in the third blind groove and preventing the shielding cylinder 7 from moving relative to the central cylinder 15 of the insulating shell 1 and causing poor welding.

[0049] The third solder ring 11 is located in the third blind groove. After the third solder ring 11 melts to form solder liquid, the solder liquid flows in the third blind groove to fully fill the gap between the third protruding ring 71 and the central cylinder 15 of the insulating shell 1. After the solder liquid of the third solder ring 11 cools and solidifies, the shielding cylinder 7 and the central cylinder 15 of the insulating shell 1 can be firmly welded together.

[0050] The static contact 2 is provided with a fourth protruding ring 22. The fourth protruding ring 22 is arranged around the central axis of the static contact 2. The static contact 2 includes a first guide rod, and the fourth protruding ring 22 protrudes integrally from the outer side surface of the first guide rod. An insulating shell 1 is provided with a fourth blind groove 23. The fourth blind groove 23 is recessed from the outer surface of the insulating shell 1, and the fourth protruding ring 22 is immersed in the fourth blind groove 23 to prevent the fourth protruding ring 22 from protruding out of the insulating shell 1 and being touched by the outside. The bottom wall of the fourth blind groove 23 is used to block and contact the fourth protruding ring 22.

[0051] The fourth blind groove 23 is arranged on the second end cover 14 of the insulating shell 1. During the installation of the static contact 2 and the insulating shell 1, the first guide rod is penetrated through the first end cover 13 of the insulating shell 1, and the bottom wall of the fourth blind groove 23 is used to block and contact the fourth protruding ring 22 to prevent the static contact 2 from being over-inserted, ensuring that the static contact 2 and the second end cover 14 of the insulating shell 1 are quickly and accurately installed together and improving the assembly efficiency of the two.

[0052] The fourth solder ring 12 is located in the fourth blind groove 23, and the fourth solder ring 12 is located between the fourth protruding ring 22 and the bottom wall of the fourth blind groove 23. The fourth protruding ring 22 and the second end cover 14 of the insulating shell 1 are used to clamp and fix the fourth solder ring 12, ensuring that the fourth solder ring 12 is quickly and accurately assembled in the required position, thereby improving the installation efficiency and installation yield of the fourth solder ring 12.

[0053] In addition, after the fourth solder ring 12 melts to form solder liquid, the solder liquid flows in the fourth blind groove 23, thereby fully filling and sealing the gap between the fourth protruding ring 22 and the second end cover 14 of the insulating shell 1. After the solder liquid of the fourth solder ring 12 cools and solidifies, the fourth protruding ring 22 and the second end cover 14 of the insulating shell 1 can be firmly welded together.

[0054] The moving contact 3 is provided with a non-circular portion 24, and the insulating housing 1 is provided with a non-circular hole 25 for accommodating the non-circular portion 24. The non-circular portion 24 is slidably accommodated in the non-circular hole 25, and the inner hole 39 of the non-circular hole 25 is used to stop and abut against the outer surface of the non-circular portion 24. By means of the inner hole 39 of the non-circular hole 25 stopping and abutting against the outer surface of the non-circular portion 24, the moving contact 3 is prevented from rotating relative to the first end cover 13 of the insulating housing 1, ensuring that the moving contact 3 can stably and accurately slide back and forth relative to the first end cover 13 of the insulating housing 1.

[0055] The other end of the stationary contact 2 is located outside the insulating shell 1 and is provided with an internal threaded hole 26 for accommodating a conductor. In actual use, the conductor is inserted into the internal threaded hole 26, and then the thread head is screwed into the internal threaded hole 26 to fix the conductor and the stationary contact 2 together. The other end of the moving contact 3 is located outside the insulating shell 1 and is provided with an external threaded portion 27 for conducting another conductor. The conductor is fixed to the external threaded portion 27 via a nut to achieve a fixed connection between the conductor and the stationary contact 2.

[0056] The first contact 4 and the second contact 5 both include a body portion 28 and a flat plate portion 29 connected to the body portion 28 . The body portion 28 is substantially a hollow cylinder, and the flat plate portion 29 is substantially a circular flat plate. The flat plate portion 29 of the first contact 4 is used to connect or disconnect the flat plate portion 29 of the second contact 5 .

[0057] The main body 28 is provided with a blind hole 31, which is recessed from the end surface of the main body 28 close to one end of the flat plate portion 29. The flat plate portion 29 is used to cover the opening of the blind hole 31. The main body 28 is provided with a plurality of arcuate grooves 32, which penetrate the side wall of the main body 28. The arcuate grooves 32 are extended along the central axis of the main body 28 and along the circumferential direction of the main body 28. The plurality of arcuate grooves 32 are arranged around the central axis of the main body 28. In this embodiment, the plurality of arcuate grooves 32 are arranged in a circular array around the central axis of the main body 28.

[0058] The flat plate portion 29 is provided with a plurality of straight groove bodies 33 penetrating the flat plate portion 29. The straight groove bodies 33 extend along the radial direction of the flat plate portion 29, penetrate the flat plate portion 29 in the thickness direction of the flat plate portion 29, and penetrate the outer side surface of the flat plate portion 29. The plurality of straight groove bodies 33 are arranged around the central axis of the flat plate portion 29. In this embodiment, the plurality of straight groove bodies 33 are arranged in a circular array around the central axis of the flat plate portion 29, and the plurality of straight groove bodies 33 are respectively communicated with the plurality of arc groove bodies 32.

[0059] When the first contact 4 contacts or disconnects from the second contact 5, a discharge arc will be generated between the first contact 4 and the second contact 5. Through the arrangement of the arc groove body 32 and the straight groove body 33, the discharge arc is elongated and enters the blind hole 31 and the arc groove body 32 through the straight groove body 33, shortening the arc extinguishing time, improving the arc extinguishing efficiency, and improving the service performance of the vacuum switch tube. In addition, by means of the arrangement of the shielding cylinder 7 for the discharge arc between the first contact 4 and the second contact 5, it is possible to avoid the interference of the external electromagnetic field on the discharge arc between the first contact 4 and the second contact 5, and at the same time avoid the discharge arc between the first contact 4 and the second contact 5 from interfering with external electronic products.

[0060] The first contact 4 and the second contact 5 further include a support ring 34 located in the blind hole 31. The support ring 34 is made of stainless steel, and both ends of the support ring 34 are respectively welded to the flat plate portion 29 and the bottom wall of the blind hole 31. The straight groove body 33 communicates with the gap between the support ring 34 and the inner side surface of the blind hole 31; the flat plate portion 29 has a central hole 38 penetrating the flat plate portion 29, and the central hole 38 is used to communicate with the inner hole 39 of the support ring 34.

[0061] Through the arrangement of the support ring 34, on the one hand, the strength of the first contact 4 and the second contact 5 is improved, and the service life of the first contact 4 and the second contact 5 is extended. On the other hand, the space in the blind hole 31 is isolated by means of the support ring 34, so that the discharge arcs generated when the first contact 4 and the second contact 5 contact or disconnect are distributed in different parts on both sides of the support ring 34 in the blind hole 31, further improving the arc extinguishing efficiency.

[0062] The first contact 4 and the second contact 5 further include a seventh solder ring 35. The seventh solder ring 35 is located between the body portion 28 and the flat plate portion 29, and the body portion 28 and the flat plate portion 29 are welded together through the fourth solder ring 12. Through the arrangement of the seventh solder ring 35, on the one hand, it ensures that the body portion 28 and the flat plate portion 29 are firmly connected together, and on the other hand, it uses the seventh solder ring 35 to seal the gap between the body portion 28 and the flat plate portion 29, ensuring the smoothness of conduction between the two, and ensuring the conductivity yield of the first contact 4 and the second contact 5.

[0063] The first contact 4 and the second contact 5 further include a solder piece 36. The moving contact 3 is provided with a second guide rod. The body portion 28 of the second contact 5 is connected to the second guide rod, and the body portion 28 of the first contact 4 is connected to the first guide rod. The solder piece 36 is located between the guide rod and the body portion 28, and the guide rod and the body portion 28 are welded together via the solder piece 36. With the arrangement of the solder piece 36, it is ensured that the body portion 28 and the guide rod are firmly welded together. At the same time, when the solder piece 36 melts, the formed solder liquid fully fills the gap between the guide rod and the body portion 28, ensuring the smooth conductivity between the first guide rod and the first contact 4 and between the first guide rod and the second contact 5, and guaranteeing the conductivity yield.

[0064] The guide rod is provided with a positioning post 37. The positioning post 37 protrudes from the end face of one end of the guide rod. The body portion 28 has a positioning hole for accommodating the positioning post 37, and the positioning post 37 passes through the solder piece 36 and extends into the positioning hole. Through the cooperation of the positioning post 37 and the positioning hole, it is ensured that the guide rod and the body portion 28 are quickly and accurately installed and aligned together. By using the positioning post 37 to limit the solder piece 36, the solder piece 36 is quickly and accurately arranged between the guide rod and the body portion 28, avoiding the solder piece 36 falling from between the guide rod and the body portion 28 and resulting in poor installation, and improving the assembly efficiency.

[0065] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. An improved vacuum interrupter, comprising an insulating shell, a stationary contact arranged at one end of the insulating shell, and a moving contact movably arranged at the other end of the insulating shell, wherein one end of the stationary contact is provided with a first contact located in the insulating shell, and one end of the moving contact is provided with a second contact located in the insulating shell, the first contact is used to conduct or disconnect the second contact, and the other end of the stationary contact and the other end of the moving contact are respectively used to conduct two conductors in the outside world; Features: It also includes a bellows, a shielding tube, a first solder ring, a second solder ring, a third solder ring and a fourth solder ring. The bellows and the shielding tube are located in the insulating shell. The bellows is sleeved on the outside of the moving contact. The first solder ring and the second solder ring are arranged around the moving contact. The first solder ring is used for welding and sealing the gap between one end of the bellows and the insulating shell. The second solder ring is used for welding and sealing the gap between the other end of the bellows and the moving contact. The shielding tube is sleeved around the outside of the first contact and the outside of the second contact. The third solder ring is used for welding the shielding tube and the insulating shell. The fourth solder ring is used for welding and sealing the gap between the static contact and the insulating shell. The insulating shell is provided with a third blind groove, which is concavely formed from the inner surface of the insulating shell, and is arranged around the central axis of the insulating shell; the shielding cylinder is provided with a third protruding ring, which is arranged around the central axis of the shielding cylinder, and the third protruding ring is accommodated in the third blind groove, and the inner side surface of the third blind groove is used to stop and resist the third protruding ring, and the third solder ring is located in the third blind groove; The first contact and the second contact both include a main body and a flat plate connected to the main body, the flat plate of the first contact is used to connect or disconnect the flat plate of the second contact; the main body is provided with a blind hole, the flat plate is used to cover the opening of the blind hole, the main body is provided with a plurality of arc-shaped grooves, the arc-shaped grooves penetrate the side wall of the main body, the arc-shaped grooves extend along the central axis of the main body and along the circumferential direction of the main body, and the plurality of arc-shaped grooves are arranged around the central axis of the main body; the flat plate is provided with a plurality of straight grooves penetrating the flat plate, the plurality of straight grooves are arranged around the central axis of the flat plate, and the plurality of straight grooves are respectively connected to the plurality of arc-shaped grooves.

2. The improved vacuum interrupter according to claim 1, Features: The insulating shell includes a first end cover, a second end cover, a center tube, a fifth solder ring, and a sixth solder ring. The fifth solder ring is welded to seal the first end cover and one end of the center tube, the sixth solder ring is welded to seal the second end cover and the other end of the center tube, and the third solder ring is welded to weld the center tube and the shielding tube; the moving contact is slidably arranged on the first end cover, the moving contact passes through the first end cover, the moving contact and the static contact are collinearly arranged, the first solder ring is welded to seal one end of the bellows and the first end cover; the static contact is arranged on the second end cover, the static contact passes through the second end cover, and the fourth solder ring is welded to seal the static contact and the second end cover.

3. The improved vacuum interrupter according to claim 2, Features: The bellows comprises a bellows body and a first protruding ring arranged at one end of the bellows body, wherein the first protruding ring surrounds the moving contact; the insulating shell is provided with a first blind groove for accommodating the first protruding ring, and the first solder ring is located in the first blind groove.

4. The improved vacuum interrupter according to claim 3, Features: The moving contact has a disc body disposed around the central axis of the moving contact. The disc body has a second blind groove surrounding the central axis of the moving contact. The bellows includes a second protruding ring provided at the other end of the corrugated body. The second protruding ring is disposed around the moving contact and is received in the second blind groove. The second solder ring is used to weld and seal the second protruding ring and the disc body.

5. The improved vacuum interrupter according to claim 1, characterized in that: The static contact is provided with a fourth protruding ring disposed around the central axis of the static contact. The insulating housing is provided with a fourth blind groove recessed from the outer surface of the insulating housing. The fourth protruding ring is received in the fourth blind groove, and the bottom wall of the fourth blind groove is used to block and abut against the fourth protruding ring. The fourth solder ring is located in the fourth blind groove and is located between the fourth protruding ring and the bottom wall of the fourth blind groove.

6. The improved vacuum interrupter according to claim 2, characterized in that: The moving contact is provided with a non-circular portion, and the insulating housing is provided with a non-circular hole for receiving the non-circular portion. The non-circular portion is slidably received in the non-circular hole, and the inner hole surface of the non-circular hole is used to block and abut against the outer surface of the non-circular portion. The other end of the static contact is located outside the insulating housing and is provided with an internal threaded hole for receiving a conductor. The other end of the moving contact is located outside the insulating housing and is provided with an external threaded portion for conducting another conductor.

7. The improved vacuum interrupter according to claim 1, characterized in that: The first contact and the second contact further include a support ring located in the blind hole. Both ends of the support ring are respectively welded to the flat plate portion and the bottom wall of the blind hole. The straight slot communicates the gap between the support ring and the inner side surface of the blind hole. The flat plate portion has a central hole penetrating through the flat plate portion, and the central hole is used to communicate the inner hole of the support ring.

8. The improved vacuum interrupter according to claim 7, characterized in that: The first contact and the second contact further include a seventh solder ring located between the body portion and the flat plate portion. The body portion and the flat plate portion are welded together via the fourth solder ring.

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