Multi-layer corrugated pipe assembly for outdoor vacuum circuit breaker

Abstract

The utility model relates to the technical field of RMAirSet environment-friendly gas insulation switch cabinets, in particular to a multi-layer corrugated pipe assembly for an outdoor vacuum circuit breaker, which comprises a corrugated pipe body, a transmission shaft body is arranged in the corrugated pipe body, a mounting flange is arranged at the top of the corrugated pipe body, a connecting flange is arranged at the bottom of the corrugated pipe body, and the transmission shaft body and the connecting flange are arranged in the corrugated pipe body. A plurality of layers of corrugated surfaces are arranged on the surface of the corrugated pipe body. According to the multi-layer corrugated pipe assembly for the outdoor vacuum circuit breaker, the surface of the corrugated pipe body is provided with the multi-layer corrugated surface, the outer surface of the corrugated pipe body is provided with the multi-layer corrugated surface structure with the gradually-changed outer diameter, and several wave layers with the minimum rigidity in the middle of the multi-layer corrugated surface are firstly stressed, so that the pressure on the two sides is compressed towards several corrugations in the middle at the same time; according to the utility model, the structure is simple, the stress is uniform, and the combination of multiple layers of corrugated surfaces enables the stress to be more uniform, thereby achieving the switching-on and switching-off movement between the circuit breaker and the vacuum arc-extinguishing chamber, and achieving the higher mechanical performance standard.

Description

Technical Field

[0001] The utility model relates to the technical field of RMAirSet environmentally friendly gas-insulated switch cabinets, in particular to a multi-layer bellows assembly for an outdoor vacuum circuit breaker. Background Art

[0002] RM AirSet environmentally friendly gas-insulated switchgear uses air as raw material to obtain compressed gas, and has strong insulation performance. The load switch of this switchgear usually adopts vacuum arc extinguishing parallel breaking, which has high requirements for the sealing of the switchgear. Bellows refers to a tubular elastic sensitive element connected along the folding and stretching direction with foldable corrugated sheets. The vacuum circuit breaker is an important moving part on the switchgear. When the circuit breaker is opened and closed, the main shaft rotates to transmit energy to the arc extinguishing chamber. Since the circuit breaker mechanism is outside the switchgear, a component with a sealing movement function is usually required to connect the circuit breaker mechanism part and the vacuum arc extinguishing chamber to realize the entire opening and closing movement.

[0003] After searching, for example, the utility model patent with Chinese patent number CN201274254Y discloses a bellows assembly for vacuum circuit breakers. The utility model consists of a bellows and a transmission shaft passing through the bellows. At the same time, the bellows has welding flanges and mounting flanges at both ends. The upper end opening of the mounting flange is provided with an "O"-shaped groove for placing a sealing ring. The bellows in the bellows assembly is a single-layer straight cylindrical bellows. The pressure resistance and working fatigue life are not bad. The working life can reach up to 8,000 times, and the pressure resistance does not exceed 0.15MPa at most.

[0004] After searching, for example, the utility model patent with Chinese patent number CN204144143U discloses a metal bellows capable of withstanding rapid compression. The utility model adopts a bellows outer diameter wave height that increases from both ends to the middle at the same amplitude, and has a long practical life. At a switching speed of >5m / S, the service life exceeds 100,000 times. The bellows is a single-layer bellows, and there is no specific description of the pressure resistance performance, which cannot meet the needs of society. Therefore, it is proposed that a multi-layer bellows assembly be used for outdoor vacuum circuit breakers to solve the above-mentioned problems. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a multi-layer bellows assembly for an outdoor vacuum circuit breaker which is pressure-resistant and durable.

[0006] In order to achieve the above-mentioned purpose of pressure resistance and durability, the utility model provides the following technical solution: a multi-layer bellows assembly for an outdoor vacuum circuit breaker, comprising a bellows body, a transmission shaft body is arranged inside the bellows body, a mounting flange is arranged on the top of the bellows body, a connecting flange is arranged on the bottom of the bellows body, and a multi-layer corrugated surface is arranged on the surface of the bellows body.

[0007] Furthermore, the bellows body is a hollow component, and the transmission shaft body is suspended and installed inside the bellows body.

[0008] Furthermore, the transmission shaft body is fixedly installed between the circuit breaker and the vacuum interrupter by means of threads.

[0009] Furthermore, the mounting flange is fixedly mounted on the top of the bellows body by means of a chimeric engagement, and the mounting flange is fixedly mounted on the transmission shaft body.

[0010] Furthermore, the connecting flange is fixedly mounted on the bottom of the bellows body by means of a chimerical engagement, and the connecting flange is fixedly mounted on the transmission shaft body.

[0011] Furthermore, the outer diameter peaks of the multi-layer corrugated surface increase gradually from the two ends to the middle.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] 1. The multi-layer bellows assembly for the outdoor vacuum circuit breaker is provided with a multi-layer corrugated surface on the surface of the bellows body. Since the outer diameter peaks of the multi-layer corrugated surface gradually increase from both ends to the middle, in the bellows body, the higher the peak of the wave layer, the smaller the stiffness, and the corrugation with the smallest stiffness is compressed first. Under the structure of the bellows body, when the bellows body is subjected to pressure, each wave layer is compressed toward the middle at the same time, thereby evenly stressing the bellows body, so that the pressure resistance and life of the bellows body can reach the best.

[0014] 2. The multi-layer bellows assembly for the outdoor vacuum circuit breaker is provided with a multi-layer corrugated surface on the surface of the bellows body. Since the outer surface of the bellows body has a multi-layer corrugated surface structure with a gradually changing outer diameter, the wave layers with the smallest rigidity in the middle of the multi-layer corrugated surface are first stressed, so that the pressure on both sides is compressed toward the middle corrugations at the same time, and the stress is evenly applied. The combination of the multi-layer corrugated surface makes the stress more even, realizing the opening and closing movement between the circuit breaker and the vacuum interrupter, while the mechanical properties reach a higher standard. After testing, the service life reaches more than 15,000 times, and the pressure resistance performance exceeds 0.4MPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the bellows body of the utility model;

[0017] Figure 3 For this utility model Figure 2 Schematic diagram of the structure at A in the middle.

[0018] In the figure: 1. Bellows body; 2. Drive shaft body; 3. Mounting flange; 4. Connecting flange; 5. Multi-layer corrugated surface. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] See also Figure 1-3The multilayer bellows assembly for outdoor vacuum circuit breaker in this embodiment includes a bellows body 1. The bellows refers to a tubular elastic sensitive element connected by foldable corrugated sheets along the folding and stretching direction. The main purpose is to be used as a measuring element of a pressure measuring instrument to convert pressure into displacement or force. The bellows has a thin wall and a high sensitivity. The measuring range is from tens of Pa to tens of MPa. Its open end is fixed, the sealed end is in a free state, and an auxiliary spiral spring or reed is used to increase the elasticity. When working, it stretches along the length direction of the tube under the action of internal pressure, so that the movable end produces a displacement that is related to the pressure. The bellows body 1 of the device adopts a multi-layer corrugated structure, and the applied pressure can be distributed on each corrugated surface through the expansion and contraction process, so that the force is evenly applied, thereby increasing the service life of the bellows body 1. The multi-layer bellows has high strength, good durability, and low stress. A transmission shaft body 2 is arranged inside the bellows body 1. Through the threads on the transmission shaft body 2, the components are respectively connected to the circuit breaker mechanism part and the vacuum interrupter part to realize the opening and closing movement of the device. A mounting flange 3 is arranged on the top of the bellows body 1. The mounting flange 3 is a flange joint, and the mounting flange 3 is matched with the bellows body 1 through the mounting flange 3. The bellows body 1 can be evenly stressed at the top corrugation of the bellows body 1, and the bellows body 1 is installed by being embedded with the mounting flange 3. The mounting flange 3 can compress and support the bellows body 1 to avoid affecting the normal use of the bellows body 1 due to uneven stress. The bellows body 1 is provided with a connecting flange 4 at the bottom. The connecting flange 4 is a flange seat. The connecting flange 4 is embedded with the bellows body 1 to make the contact surface with the bellows body 1 evenly stressed when the bellows body 1 is compressed, which can avoid incomplete compression of the bellows body 1 due to uneven stress on the bellows body 1. The surface of the bellows body 1 is provided with multiple The outer diameter peaks of the multi-layer corrugated surface 5 gradually increase from both ends to the middle. According to the principle that the higher the peak of the wave layer, the smaller the stiffness, when the bellows body 1 is compressed, each wave layer moves toward the middle at the same time, so that each corrugation is evenly stressed, thereby enhancing the mechanical properties of the bellows body 1, thereby avoiding the reduction of the service life of the bellows body 1 due to uneven stress, realizing the opening and closing movements between the circuit breaker and the vacuum interrupter, and improving the mechanical properties of the bellows body 1, so that the service life of the bellows body 1 reaches more than 15,000 times, and the pressure resistance performance exceeds 0.4MPa.

[0021] When implementing, follow these steps:

[0022] 1) First, the mounting flange 3 is fixedly mounted on the bellows body 1 by engaging with it;

[0023] 2) Then the connecting flange 4 is installed at the bottom of the bellows body 1 by means of a chimeric method;

[0024] 3) Then, the transmission shaft body 2 is inserted into the connecting flange 4 and the mounting flange 3 through clearance fit;

[0025] 4) Finally, the thread on the surface of the transmission shaft body 2 is used to fix the circuit breaker and the vacuum interrupter to complete the installation of the assembly.

[0026] To sum up, the multi-layer bellows assembly for the outdoor vacuum circuit breaker is provided with a multi-layer corrugated surface 5 on the surface of the bellows body 1. Since the outer diameter peaks of the multi-layer corrugated surface 5 gradually increase from both ends to the middle, in the bellows body 1, the higher the peak of the wave layer, the smaller the stiffness, and the corrugation with the smallest stiffness is compressed first. Under the structure of the bellows body 1, when the bellows body 1 is subjected to pressure, each wave layer is compressed toward the middle at the same time, thereby evenly exerting force, so that the pressure resistance and life of the bellows body 1 can reach the best.

[0027] In addition, a multi-layer corrugated surface 5 is arranged on the surface of the bellows body 1. Since the outer surface of the bellows body 1 has a multi-layer corrugated surface 5 structure with a gradually changing outer diameter, the wave layers with the smallest rigidity in the middle of the multi-layer corrugated surface 5 are first stressed, so that the pressure on both sides is compressed toward the middle corrugations at the same time, and the stress is evenly applied. The combination of the multi-layer corrugated surface 5 makes the stress more even, realizing the opening and closing movements between the circuit breaker and the vacuum interrupter, while the mechanical properties reach a higher standard. After testing, the service life reaches more than 15,000 times, and the pressure resistance performance exceeds 0.4MPa.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multilayer bellows assembly for an outdoor vacuum circuit breaker, comprising a bellows body (1), characterized in that: A transmission shaft body (2) is arranged inside the bellows body (1), a mounting flange (3) is arranged at the top of the bellows body (1), a connecting flange (4) is arranged at the bottom of the bellows body (1), and a multi-layer corrugated surface (5) is arranged on the surface of the bellows body (1).

2. The multilayer bellows assembly for outdoor vacuum circuit breaker according to claim 1, characterized in that: The bellows body (1) is a hollow component, and the transmission shaft body (2) is installed in the air inside the bellows body (1).

3. The multi-layer bellows assembly for outdoor vacuum circuit breaker according to claim 1, characterized in that: The transmission shaft body (2) is fixedly installed between the circuit breaker and the vacuum interrupter by means of threads.

4. The multi-layer bellows assembly for outdoor vacuum circuit breaker according to claim 1, characterized in that: The mounting flange (3) is fixedly mounted on the top of the bellows body (1) by means of an engaging manner, and the mounting flange (3) is fixedly mounted on the transmission shaft body (2).

5. The multi-layer bellows assembly for outdoor vacuum circuit breaker according to claim 1, characterized in that: The connecting flange (4) is fixedly mounted on the bottom of the bellows body (1) by means of an interlocking manner, and the connecting flange (4) is fixedly mounted on the transmission shaft body (2).

6. The multi-layer bellows assembly for outdoor vacuum circuit breaker according to claim 1, characterized in that: The outer diameter peaks of the multi-layer corrugated surface (5) increase gradually from the two ends to the middle.

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