WO2022007892A1

WO2022007892A1 - Corrugated pipe assembly, vacuum interrupter, and vacuum circuit breaker

Info

Publication number: WO2022007892A1
Application number: PCT/CN2021/105228
Authority: WO
Inventors: 郝留成; 韩书谟; 钟建英; 李凯; 苗晓军; 李小钊; 薛从军; 范艳艳; 庞亚娟; 王晓琴; 赵晓民; 李永林; 毕迎华
Original assignee: 平高集团有限公司; 国家电网有限公司; 国网辽宁省电力有限公司电力科学研究院
Priority date: 2020-07-08
Filing date: 2021-07-08
Publication date: 2022-01-13
Also published as: CN111986951A; CN111986951B

Abstract

The present invention relates to the technical field of corrugated pipes, and specifically relates to a corrugated pipe assembly, a vacuum interrupter, and a vacuum circuit breaker. The corrugated pipe assembly comprises: a corrugated pipe body, wherein corrugations for fixation are respectively provided at two axial ends of the corrugated pipe body; and flanges, which are arranged at two axial ends of the corrugated pipe body, wherein an inner annular groove is formed on the inner circumferential surface of the flanges, the corrugations for fixation being embedded in the inner annular grooves, and two root parts of the corrugations for fixation are both fixed onto the flanges. The corrugations for fixation are embedded in the inner annular grooves of the flanges, and two root parts are both fixed onto the flanges, thereby achieving the effect of integrating the corrugations at end parts of the corrugated pipe body with the flanges, such that the force at end parts of the corrugated pipe body is borne jointly by the corrugations for fixation, the flanges, and the places of connection between the corrugations for fixation and the flanges. Compared to the prior art, stress conditions of the corrugations at the end parts of the corrugated pipe body are effectively improved, and the possibility of fatigue cracks in the corrugations at the end parts of the corrugated pipe can be effectively reduced.

Description

A bellows assembly, vacuum interrupter and vacuum circuit breaker

technical field

The invention relates to the technical field of bellows, in particular to a bellows assembly, a vacuum interrupter and a vacuum circuit breaker.

Background technique

In foreign countries, vacuum circuit breakers have become the leading products in the medium-voltage field, mainly due to the following reasons: First, with the advancement of vacuum circuit breaker technology, high-voltage, high-current, frequent-operation, under-voltage and over-voltage types have emerged. Special types of vacuum circuit breakers such as vacuum circuit breakers and economical types can meet the needs of different breaking tasks, provide users with sufficient space for choice, and are favored by users; secondly, in terms of functions, vacuum circuit breakers have developed from the original single function to Multifunctional type, that is, in addition to the original breaking function, it also adds functions such as isolation and grounding, which greatly simplifies the overall structure of the switch; in addition, the vacuum circuit breaker uses environmentally friendly gases as insulating media, such as N ₂ , CO ₂ etc., belong to the environment-friendly vacuum circuit breaker. Compared with the SF ₆ vacuum circuit breaker, the vacuum circuit breaker does not use SF ₆ gas, so there is no problem of the greenhouse effect caused by the leakage _{of SF 6 gas, which also objectively promotes the} The development of vacuum circuit breakers.

The vacuum interrupter is an important part of the vacuum circuit breaker. my country has many years of experience in the production of vacuum interrupters. In recent years, through various efforts, the quality and reliability of the vacuum interrupter for medium and low voltage vacuum circuit breakers of 40.5kV and below The performance has been greatly improved, and it can basically meet the use requirements of vacuum circuit breakers. In the process of developing towards an environmentally friendly high-voltage vacuum circuit breaker, when a vacuum interrupter is used as the breaking unit, the pressure of the external insulating medium is higher and the breaking speed is higher, which puts forward higher requirements for the vacuum interrupter. requirements.

Specifically, the structure of the vacuum interrupter for medium and low voltage vacuum circuit breakers is shown in FIG. 1 . The vacuum interrupter includes a housing 200 . The two ends of the housing 200 are respectively provided with a movable cover plate 100 and a static cover plate 400 . The head 500 is fixed on the static cover 400, the moving cover 100 is provided with a through hole, one end of the moving conductive rod 700 extends into the housing 200 through the through hole and is fixed with the moving contact 300, and the moving conductive rod 700 is sleeved A bellows 600 is provided, one end of the bellows 600 is welded and fixed on the movable cover plate 100, and the other end is welded and fixed on the movable conductive rod 700. When the movable conductive rod 700 drives the movable contact 300 to move, the bellows 600 follows the movement and conducts electricity. The rod 700 is telescopically deformed. The outside of the bellows 600 is in the vacuum chamber enclosed by the casing 200 , the movable cover 100 and the static cover 400 . The inside of the bellows 600 communicates with the inside of the vacuum circuit breaker casing. The bellows 600 needs to withstand a certain insulating gas pressure.

At present, single-layer U-shaped hydraulic bellows are used in vacuum interrupters. For the above-mentioned medium and low pressure switches, the opening distance, opening and closing speed, and insulating gas pressure are all low, and the free length of the bellows is short, and the inner bearing When pressed, its fatigue life can meet the mechanical life requirements of 10,000 times of switching.

For the 126kV switch, on the one hand, the increase in the opening distance results in an increase in the free length of the bellows, on the other hand, the opening and closing speed of the switch and the pressure of the insulating gas are greatly increased. Axial instability is easy to occur, resulting in local distortion, cracking and other phenomena, which in turn causes the bellows to have a low lifespan and cannot meet the switching requirements of environmental protection switches, especially the bellows at the end of the bellows. The force and action are transmitted to the bellows as a whole, and fatigue cracks are most likely to occur at the troughs of the bellows, thereby causing the bellows to fail. For the vacuum interrupter using the above-mentioned bellows, the service life of the vacuum interrupter cannot be met due to the failure of the bellows. Similarly, for the vacuum circuit breaker using the vacuum interrupter, the The service life requirement cannot be met due to the failure of the vacuum interrupter.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a bellows assembly to solve the technical problem of the failure of the bellows in the prior art due to the easy fatigue cracking of the corrugations at the ends; the purpose of the present invention is also to provide a vacuum interrupter, In order to solve the technical problem that the vacuum interrupter has a short service life due to the failure of the bellows in the prior art; the purpose of the present invention is to provide a vacuum circuit breaker to solve the failure of the bellows of the vacuum interrupter in the prior art. Causes the problem of short service life of the vacuum circuit breaker.

To achieve the above purpose, the technical scheme of the bellows assembly of the present invention is:

The bellows assembly includes: a bellows main body, and two axial ends of the bellows main body are respectively provided with corrugations for fixing;

flanges are arranged at both axial ends of the bellows main body, and an inner ring groove is provided on the inner peripheral surface of the flange;

The fixing corrugations are embedded in the inner ring groove, and both parts of the fixing corrugations are fixed on the flange.

The beneficial effect of the invention is that the fixing corrugations are embedded in the inner ring groove of the flange, and the two parts are fixed on the flange, so as to achieve the effect of integrating the corrugations at the end of the main body of the corrugated pipe with the flange, so that the corrugated pipe is integrated into the flange. The force at the end of the main body is jointly borne by the fixing corrugations, the flange and the connection between the fixing corrugations and the flange. Compared with the prior art, the force of the corrugations at the end of the main body of the bellows is effectively improved, thereby effectively The possibility of fatigue cracks occurring in the corrugations at the end of the corrugated pipe is reduced, and the technical problem that the corrugated pipe is prone to fatigue cracking at the end of the corrugated pipe in the prior art is solved.

As a preferred technical solution, the bellows main body is a multi-layer structure formed by a multi-layered pipe body, and the two axial ends of the bellows main body are respectively provided with straight edge portions, and the straight edge portions are formed by the bellows main body. Each layer of tube body is formed as a whole by seam welding connection;

Among the two root parts of the fixing corrugated pipe, the root part far from the outer end of the bellows body is defined as the inner root part. Fixing on the orchid.

Beneficial effects: the main body of the bellows is set to a multi-layer structure, which is beneficial to improve the overall toughness of the main body of the bellows, thereby improving the fatigue strength of the main body of the bellows, and prolonging the service life of the main body of the bellows. In addition, since each layer of the main body of the bellows is relatively thin, the possibility of each layer being welded through during the welding process can be reduced by seam welding, and the sealing between the layers at the inner root can be ensured by one welding, which is convenient for welding. ; When each layer forms a straight edge part by welding, the straight edge part has a certain thickness, and the straight edge part can be fixed on the flange by a suitable welding method, without considering the sealing between the layers, Easy to fasten the inner root to the flange.

As a preferred technical solution, the main body of the corrugated pipe is a multi-layer structure formed by a multi-layered pipe body, and the root part located near the outer end of the main body of the corrugated pipe among the two parts of the corrugated pipe for fixing is defined as the outer root part. The outer end surface and the inner wall surface of the corresponding flange are welded and fixed to form an inner girth weld, and the outer root of the fixing corrugation can be fixed on the flange.

Beneficial effects: welding and fixing between the layers of the outer root and between the outer root and the flange is convenient.

As a preferred technical solution, the main body of the corrugated pipe is a multi-layered structure formed by a multi-layered pipe body, and seam welding is performed between each layer of the two parts of the corrugated for fixing and between the two parts of the corrugated for fixing and the flange. fixed.

Beneficial effect: Since each layer of the main body of the bellows is relatively thin, the possibility of each layer being welded through during the welding process can be reduced by seam welding, and the sealing between the layers of the pipe body can be ensured by one welding, which is convenient Welding; in addition, the root and the flange are fixed by seam welding, which is beneficial to increase the welding area of the root and the flange, thereby improving the connection stability of the root and the flange.

As a preferred technical solution, the flange includes a first flange body and a second flange body, the first flange body and the second flange body are axially aligned and fixed to each other along the main body of the bellows, and the inner ring groove It is formed by the abutment of the first flange body and the second flange body.

Beneficial effect: It is convenient to design and process the flange.

As a preferred technical solution, it is provided in the two flanges at both ends of the bellows main body in the axial direction, and one of the outer ends is provided with an inner flange, and the inner flange is used to connect with the outer periphery of the movable conductive rod of the vacuum interrupter. surface fixed connection.

Beneficial effects: When the bellows assembly is used on the vacuum interrupter, it can be fixedly connected to the outer peripheral surface of the movable conductive rod through the inner flange of the flange, and at the same time the other flange is connected to the movable cover plate of the vacuum interrupter, so that the The outside of the bellows assembly is located in the high-pressure air chamber outside the vacuum interrupter, and at the same time, the inside of the bellows assembly is communicated with the interior of the vacuum interrupter, so that the outside of the bellows assembly is subjected to high pressure, so as to improve the use of the bellows assembly. The stability of the process is beneficial to improve the fatigue life of the vacuum interrupter.

As a preferred technical solution, a corrugation set on the corrugated pipe body close to the fixing corrugations is defined as an end corrugation, and the peak height of the end corrugation is smaller than the peak height of any other corrugation between the two end corrugations .

Beneficial effects: The design of the peak height of the corrugation at the end is beneficial to improve the transmission capacity and conduction rate of the force and action of the corrugated pipe assembly, improve the force of the corrugated end, and prolong the service life of the corrugated pipe.

To achieve the above purpose, the technical scheme of the vacuum interrupter of the present invention is:

The vacuum interrupter includes: a casing, a movable conductive rod guided and movably assembled on the casing, and a bellows assembly fixed on the movable conductive rod;

The beneficial effect of the invention is that the fixing corrugations are embedded in the inner ring groove of the flange, and the two parts are fixed on the flange, so as to achieve the effect of integrating the corrugations at the end of the main body of the corrugated pipe with the flange, so that the corrugated pipe is integrated into the flange. The force at the end of the main body is shared by the fixing corrugations, the flange and the connection between the fixing corrugations and the flange. Compared with the prior art, the force of the corrugations at the end of the main body of the corrugated pipe is effectively improved, and the corrugation is improved. Therefore, the technical problem of the short service life of the vacuum interrupter caused by the failure of the bellows in the prior art is solved.

Beneficial effect: It is convenient to design and process the flange.

As a preferred technical solution, the casing includes a casing, a movable cover plate and a static cover plate, and the movable cover plate and the static cover plate are respectively fixed at both axial ends of the casing;

The movable cover plate is provided with a concave portion, the concave portion is provided with a through hole, and the movable conductive rod extends into the casing through the through hole; the flange at one end of the axial direction of the bellows assembly is fixed on the The flange at the other axial end of the movable conductive rod is fixed on the recessed part, so that the outside of the bellows main body is outside the casing, and the inside of the bellows main body communicates with the inside of the casing through the through hole.

Beneficial effects: The outside of the bellows assembly is subjected to high pressure, which can effectively improve the stability of the use process of the bellows assembly, thereby helping to improve the fatigue life of the vacuum interrupter.

For realizing the above-mentioned purpose, the technical scheme of the vacuum circuit breaker of the present invention is:

The vacuum circuit breaker includes: vacuum interrupter and operating mechanism;

The vacuum interrupter comprises: a casing, a movable conductive rod guided and movably assembled on the casing, and a bellows assembly fixed on the movable conductive rod;

The beneficial effect of the invention is that the fixing corrugations are embedded in the inner ring groove of the flange, and the two parts are fixed on the flange, so as to achieve the effect of integrating the corrugations at the end of the main body of the corrugated pipe with the flange, so that the corrugated pipe is integrated into the flange. The force at the end of the main body is shared by the fixing corrugations, the flange and the connection between the fixing corrugations and the flange. Compared with the prior art, the force of the corrugations at the end of the main body of the corrugated pipe is effectively improved, and the corrugation is improved. Therefore, the technical problem of short service life of the vacuum circuit breaker caused by the failure of the bellows of the vacuum interrupter in the prior art is solved.

Beneficial effect: It is convenient to design and process the flange.

Description of drawings

Fig. 1 is the structural representation of vacuum interrupter in the prior art;

2 is a schematic structural diagram of the specific embodiment 1 of the bellows assembly of the present invention;

Fig. 3 is the partial enlarged view of A place in Fig. 2;

Fig. 4 is the partial structure schematic diagram at B in Fig. 2;

Fig. 5 is the partial structure schematic diagram of C place in Fig. 2;

FIG. 6 is a schematic structural diagram of the specific embodiment 1 of the vacuum interrupter of the present invention.

In the figure: 100-moving cover; 200-shell; 300-moving contact; 400-static cover; 500-static contact; 600-bellows; 700-moving conductive rod; 1-bellows body; 2 - Flange; 3 - Fixed corrugations; 4 - End corrugations; 5 - Housing; 6 - Moving cover; 7 - Static cover; 8 - Moving contact; 9 - Static contact; 10 - Moving conductive rod ; 11-straight edge part; 12-waveform; 800-vacuum chamber; 900-high pressure chamber; 21-first flange body; 22-second flange body; 23-inner ring groove; 24-inner flange ; 31 - medial root; 32 - lateral root.

detailed description

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention 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 used to explain the present invention, but not to limit the present invention, that is, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that relational terms such as the terms "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The features and performances of the present invention will be further described in detail below in conjunction with the embodiments.

The specific embodiment 1 of the bellows assembly of the present invention:

As shown in Figures 2 and 3, the bellows assembly includes a bellows body 1 and two flanges 2. The two axial ends of the bellows body 1 are respectively provided with corrugations 3 for fixing. The corrugations 3 for fixing and the two flanges 2 One-to-one corresponding settings. The inner peripheral surface of each flange 2 is provided with an inner ring groove 23, the fixing corrugated 3 is embedded in the inner ring groove 23 of the corresponding flange 2, and the two parts of the fixing corrugated 3 are respectively welded and fixed on the corresponding flange 2. .

Specifically, as shown in FIGS. 2 to 5 , the flange 2 includes a first flange body 21 and a second flange body 22 . The two flange bodies are axially aligned along the bellows body 1 and fixed by welding to form an inner ring Slot 23. It should be noted that, when the first flange body 21 and the second flange body 22 are butted together, the outer peripheral surfaces of the two flange bodies are brought together to form an outer circumferential weld. The above-mentioned corrugated tube body 1 has a five-layer structure formed of five-layered tube bodies, and the waveform 12 of the corrugated tube main body 1 is U-shaped. In the two root parts of the fixing corrugated pipe 3, the root part far from the outer end of the corrugated pipe main body 1 is defined as the inner root part 31, and the root part close to the outer end of the corrugated pipe main body 1 is the outer root part 32. The layers of the corrugated pipe main body 1 are connected together by seam welding. 5 to form the straight edge portion 11 shown in FIG. 5 to ensure the sealing between the layers of the inner root portion 31; The definition of the inner and outer sides of the flange body is the same as the inner and outer sides of the fixing corrugations 3, that is, the side away from the outer end of the bellows body 1 is the inner side of the flange body, and the side close to the outer end of the bellows body 1 is the outer side of the flange body), The fixing of the inner root 31 and the flange 2 is realized. As shown in FIGS. 2 and 3 , the outer end surface of each layer of the bellows main body 1 is welded with the inner wall surface of the second flange body 22 to form an inner girth weld (the inner wall surface of the first flange body 21 and the second flange body The inner wall surface of the body 22 constitutes the inner peripheral surface of the flange 2 ), and the inner girth weld ensures the sealing between the layers at this place, and at the same time fixes the outer root 32 on the corresponding flange 2 .

The above-mentioned bellows body 1 and the two flanges 2 are welded and fixed to form a bellows assembly, so that the fixing bellows 3 are fused with the corresponding flanges 2, thereby improving the stress of the fixing bellows 3 at both ends of the bellows body 1, that is, the fixing The force of the corrugated 3 is shared by the fixed corrugated 3, the flange 2 and the connection between the fixed corrugated 3 and the flange 2, so as to achieve the purpose of improving the fatigue cracking resistance of the corrugated pipe, and solve the problem of the corrugated pipe in the prior art. Fatigue cracks are prone to occur in the corrugation at the part, which causes the technical problem of the failure of the corrugated pipe. In addition, the bellows body 1 adopts a multi-layer structure, which increases the overall thickness of the bellows body 1, improves rigidity and pressure bearing capacity, and at the same time greatly improves its toughness, which further improves the fatigue resistance of the bellows assembly.

As shown in Fig. 2 and Fig. 5 , the corrugations set close to the fixing corrugations 3 are defined as the end corrugations 4. The peak heights of the fixing corrugations 3 and the end corrugations 4 are both lower than the peak heights of any other corrugations. The height of the fixing corrugations 3 and the end corrugations 4 is to improve the tolerance of the fixing corrugations 3 and the end corrugations 4, thereby improving the force and the transmission capacity and speed of the bellows assembly, and improving the fixing corrugations 3 and 4. The stress condition of the end corrugations 4 is beneficial to further improve the service life of the corrugated pipe assembly. It should be noted that the distance between the end corrugations 4 on the same side of the corrugated pipe body 1 and the fixing corrugations 3 is relatively long, in order to reserve enough space for the seam welding of each layer of the inner root 31 .

In addition, as shown in FIG. 3 , the outer end of one of the two flanges 2 is provided with an inner flange 24. When the bellows assembly is used on the vacuum interrupter, the inner flange 24 is used to communicate with the vacuum interrupter. The outer peripheral surface of the movable conductive rod of the arc chamber is welded and fixed.

The manufacturing method of the bellows assembly of the present invention:

(1) Welding five stainless steel cylinders of different diameters, nesting the stainless steel cylinders of different diameters layer by layer, and processing the two flange bodies of each flange 2 at the same time;

(2) the first flange body 21 is sleeved on the outer cylinder body of the above-mentioned stainless steel cylinder and fixed, and the bellows main body 1 is hydraulically expanded by a special mold;

(3) Connect the layers of pipe bodies between the end corrugations 4 and the fixing corrugations 3 together by seam welding to form the straight edge portion 11; The outer layers of the part 11 are welded together by argon arc welding;

(4) The first flange body 21 and the corresponding second flange body 22 are butted and welded together by argon arc welding; the outer end surface of each layer of the outer root 32 and the inner wall surface of the second flange body 22 pass through the Arc welding is welded together to complete the integral molding of the bellows assembly.

The specific embodiment 2 of the bellows assembly of the present invention:

In the above-mentioned embodiment 1, the main body of the corrugated pipe has a five-layer structure in order to meet the use requirements. The main body of the bellows in this embodiment adopts a single-layer structure according to the usage scenario. It should be noted that when the bellows body adopts a single-layer structure, the thickness of the bellows body is generally thicker. At this time, the inner and outer roots can be directly welded and fixed on the corresponding flanges by other methods such as argon arc welding. Of course, in other embodiments, the bellows body may also adopt any number of layers between one layer and five layers, or the bellows body may adopt a structure of more than five layers, provided that the use requirements are met.

The specific embodiment 3 of the bellows assembly of the present invention:

The flange in the above-mentioned Embodiment 1 is formed by the abutment of two flange bodies to form an inner ring groove. The flange in this embodiment has a one-piece structure, and the inner ring groove is machined on the inner peripheral surface of the flange. It should be noted that, when processing the bellows assembly of this embodiment, before the bellows body is hydraulically expanded by a special mold, the flange needs to be fixed at the corresponding position of the multi-layer structure through the mold. In the process of hydraulic expansion, the flange is used as a corrugated forming die for the corresponding fixing.

The specific embodiment 4 of the bellows assembly of the present invention:

In the above-mentioned embodiment 1, the straight edge part and the inner end face of the first flange body are fixed by argon arc welding, and the inner root part is fixed on the flange; in this embodiment, the straight edge part and the inner peripheral surface of the first flange body are fixed. The inner root is fixed to the flange by seam welding. The straight edge part and the first flange body are fixed by seam welding, which is beneficial to increase the welding area between the inner root and the flange, and improve the welding strength of the place.

Of course, in other embodiments, the mutual fixation between the layers of the tube bodies at the inner root portion and the fixation between the inner root portion and the first flange body can also be achieved by one seam welding.

The specific embodiment 5 of the bellows assembly of the present invention:

In the above embodiment 1, the outer end surfaces of each layer of the bellows body are welded to the inner wall surface of the second flange body, and the outer root of the bellows body is fixed on the flange. In this embodiment, each layer of the tube body at the outer root is firstly connected into one body by seam welding, and then the outer root after seam welding is fixed on the second flange body by argon arc welding, so as to realize the fixing of the outer root and the flange. .

Of course, in other embodiments, the mutual fixation between the layers of the tube bodies at the outer root portion and the fixation between the outer root portion and the second flange body can also be achieved by one seam welding.

The specific embodiment 6 of the bellows assembly of the present invention:

The peak height of the corrugations at the end portion in the above-mentioned embodiment 1 is lower than the peak height of any other corrugation between the corrugations at the two ends. In this embodiment, the peak height of the end corrugations is equal to the height of a certain corrugation between the two end corrugations.

The specific embodiment 1 of the vacuum interrupter of the present invention:

As shown in FIG. 6 , the vacuum interrupter includes a casing 5, and two ends of the casing 5 are respectively provided with a movable cover plate 6 and a static cover plate 7. The movable cover plate 6, the static cover plate 7 and the casing 5 are fixedly formed. The shell of the vacuum interrupter, the static contact 9 is fixed on the static cover 7, the movable cover 6 is provided with a through hole, and one end of the movable conductive rod 10 extends into the shell through the through hole and is fixed with the movable contact 8 , the movable conductive rod 10 is sleeved with a bellows assembly, the structure of the bellows assembly in this embodiment is the same as the structure of the bellows assembly described in the specific embodiment 1 of the above-mentioned bellows assembly, and will not be repeated. One end of the bellows assembly is welded and fixed on the movable cover plate 6 and the other end is welded and fixed on the movable conductive rod 10 .

Specifically, a recessed portion is provided in the middle of the movable cover plate 6, and the through hole is arranged in the center of the recessed portion. In FIG. 2, the flange 2 without an inner flange is welded and fixed to the bottom of the recessed portion of the movable cover plate 6, and the bellows The inside of the main body 1 communicates with the inside of the vacuum interrupter through the through hole, and the flange 2 provided with the inner flange 24 is welded and fixed to the outer peripheral surface of the movable conductive rod 10 . The above-mentioned fixing method of the bellows assembly on the vacuum interrupter is such that the outside of the bellows assembly is located in the high-pressure gas chamber 900 of the vacuum circuit breaker used in the vacuum interrupter, and at the same time, the interior of the bellows assembly is connected to the vacuum interrupter. The vacuum chamber 800 is connected to each other, that is, the inner vacuum of the bellows assembly is pressurized outside. When the vacuum circuit breaker is opened, the stability of the bellows can be greatly improved, thereby improving the service life of the vacuum interrupter. In addition, due to the reasonable structural design of the bellows assembly, the vacuum interrupter can better meet the application requirements of the vacuum interrupter for high-voltage vacuum circuit breakers with large opening distance, large opening and closing speed and high insulating gas pressure.

Of course, in other embodiments of the vacuum interrupter, the structure of the bellows assembly can also adopt the structure of the bellows assembly described in any one of the specific embodiments 2-6 of the above-mentioned bellows assembly.

The specific embodiment 1 of the vacuum circuit breaker of the present invention:

The vacuum circuit breaker includes a vacuum interrupter and an operating mechanism. The vacuum interrupter is shown in Figure 6. The operating mechanism and the movable conductive rod 10 of the vacuum interrupter are connected by transmission. The operating mechanism drives the movable conductive rod 10 to move, When the movable conductive rod 10 drives the movable contact 8 to move, the bellows assembly follows the movable conductive rod 10 to expand and contract.

Of course, in other embodiments of the vacuum circuit breaker, the structure of the bellows assembly can also adopt the structure of the bellows assembly described in any one of the specific embodiments 2-6 of the above-mentioned bellows assembly.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. The scope of patent protection of the present invention is subject to the claims. Any equivalent structural changes made by using the contents of the description and drawings of the present invention, Similarly, all should be included in the protection scope of the present invention.

Claims

A bellows assembly, characterized in that it includes:

a corrugated pipe main body, wherein the two axial ends of the corrugated pipe main body are respectively provided with corrugations for fixing;

flanges are arranged at both axial ends of the bellows main body, and an inner ring groove is provided on the inner peripheral surface of the flange;

The fixing corrugations are embedded in the inner ring groove, and both parts of the fixing corrugations are fixed on the flange.
The bellows assembly according to claim 1, wherein the bellows main body is a multi-layer structure formed by a multi-layered pipe body, and the two axial ends of the bellows main body are respectively provided with straight edge portions, so The straight side part is formed by connecting the layers of the bellows main body through seam welding;

Among the two root parts of the fixing corrugated pipe, the root part far from the outer end of the bellows body is defined as the inner root part, and the straight edge part is welded and fixed with the inner end face of the corresponding flange to form a circular weld, so as to realize the inner root part of the fixing corrugated pipe in the method. Fixing on the orchid.
The corrugated pipe assembly according to claim 1, wherein the corrugated pipe body is a multi-layer structure formed by a multi-layered pipe body, and the root part of the two root parts of the fixing corrugations is defined as In the outer root part, the outer end surfaces of each layer of the bellows main body and the inner wall surface of the corresponding flange are welded and fixed to form an inner girth weld, and the outer root part of the fixing corrugated pipe is fixed on the flange.
The bellows assembly according to claim 1, wherein the bellows main body is a multi-layered structure formed of a multi-layered pipe body, between each layer of the two parts of the fixing corrugations and the two parts of the fixing corrugations The flanges are fixed by seam welding.
The bellows assembly according to any one of claims 1-4, wherein the flange comprises a first flange body and a second flange body, and the first flange body and the second flange body are The main bodies of the bellows are axially abutted and fixed to each other, and the inner ring groove is formed by the abutment of the first flange body and the second flange body.
The bellows assembly according to any one of claims 1 to 4, wherein the two flanges are arranged at two axial ends of the bellows main body, and one of the outer ends is provided with an inner flange, and the inner flange is provided with an inner flange. The flange is used for fixed connection with the outer peripheral surface of the movable conductive rod of the vacuum interrupter.
The corrugated tube assembly according to any one of claims 1-4, wherein a corrugation provided on the corrugated pipe body close to the fixing corrugations is defined as an end corrugation, and the peak height of the end corrugation is less than The peak height of any other corrugation between the two end corrugations.
The vacuum interrupter includes: a casing, a movable conductive rod guided and movably assembled on the casing, and a bellows assembly fixed on the movable conductive rod;

It is characterized in that, the bellows assembly is the bellows assembly according to any one of claims 1-7.
The vacuum interrupter according to claim 8, wherein the outer casing comprises a casing, a movable cover plate and a static cover plate, and the movable cover plate and the static cover plate are respectively fixed at both axial ends of the casing ;

The movable cover plate is provided with a concave portion, the concave portion is provided with a through hole, and the movable conductive rod extends into the casing through the through hole; the flange at one end of the axial direction of the bellows assembly is fixed on the The flange on the other end of the movable conductive rod in the axial direction is fixed on the recessed part, so that the outside of the bellows body is outside the casing, and the inside of the bellows body is communicated with the inside of the casing through the through hole.
Vacuum circuit breaker, including: vacuum interrupter and operating mechanism;

The vacuum interrupter comprises a casing, a movable conductive rod guided and movably assembled on the casing, and a bellows assembly fixed on the movable conductive rod, and the operating mechanism is drive-connected with the movable conductive rod;

It is characterized in that, the bellows assembly is the bellows assembly according to any one of claims 1-7.