CN213988723U

CN213988723U - Thin-wall vacuum corrugated pipe

Info

Publication number: CN213988723U
Application number: CN202120137897.8U
Authority: CN
Inventors: 金英杰
Original assignee: Suzhou Feituoke Metal Products Co ltd
Current assignee: Suzhou Feituoke Metal Products Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-08-17
Anticipated expiration: 2031-01-19

Abstract

The utility model relates to a thin wall vacuum bellows, be circular and have the same corrugated metal body of annular including the cross-section to and set up in the straight tube at body both ends, the body with straight tube integrated into one piece, the inside and outside wall of body is bright annealing layer, the straight tube outer wall is polishing layer. The utility model has the advantages that the inner surface and the outer surface of the body are subjected to bright annealing treatment, and the outer wall of the straight pipe is subjected to polishing treatment, so that the surface smoothness is improved, and the sealing performance is also improved; due to the special process parameter design, the ductility of the corrugated pipe is improved, the stretching and compression displacement of the corrugated pipe is ensured, and the service life of the corrugated pipe is prolonged; the vacuum switch has small volume, precision and light weight, and can be applied to vacuum switches with small specifications, precision and long fatigue life.

Description

Thin-wall vacuum corrugated pipe

Technical Field

The utility model relates to a bellows technical field, concretely relates to thin wall vacuum bellows.

Background

The vacuum switch is a switch device for switching on and off current in vacuum, a main contact of the vacuum switch is positioned in a vacuum arc-extinguishing chamber, a corrugated pipe is a key element in the vacuum arc-extinguishing chamber, and the corrugated pipe is only used to make it possible to move a movable contact by mechanical force from the outside of the vacuum arc-extinguishing chamber and keep the shell of the vacuum arc-extinguishing chamber completely sealed. The vacuum switch is switched on and off every time, the corrugated pipe is subjected to large-amplitude displacement once, and the corrugated pipe is easily damaged due to fatigue due to large-amplitude and frequent axial displacement. The bellows is an important component of the vacuum interrupter housing, and if it fails, the life of the vacuum interrupter is terminated by the gas leak. Other parts of the vacuum interrupter are not easily damaged in normal operation, so the fatigue life of the bellows also determines the mechanical life of the vacuum interrupter. Furthermore, the contact opening of the vacuum switch is equal to the actual axial displacement of the bellows. The axially allowed displacement of the bellows also determines the maximum contact opening that can be achieved.

The fatigue life of a bellows is a function of its structure and the materials used, and also of the conditions of use. The working stroke of the corrugated pipe applied to the vacuum switch has great influence on the fatigue life of the corrugated pipe. For the same corrugated pipe and the same vacuum switch, the longer fatigue life can be achieved only by reducing the working stroke or the contact opening distance of the corrugated pipe. Conversely, if the working stroke or contact opening of the bellows is increased, the fatigue life of the bellows is greatly shortened. Therefore, the main performance of the bellows for vacuum switch is the axial displacement amount and the vacuum sealing property. The vacuum switch has two working states, on or off, when the vacuum switch is switched on, the corrugated pipe needs to be stretched and deformed, when the vacuum switch is switched off, the corrugated pipe is compressed and deformed, and in order to guarantee the service life of the vacuum switch, the displacement of stretching and compressing of the corrugated pipe is a very key influence factor.

The smaller the size of the bellows, the more difficult and costly to manufacture. In the current domestic market, the vacuum corrugated pipes with excellent fatigue life are fewer and fewer when the specification of the vacuum corrugated pipes is considered.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the utility model provides a vacuum corrugated pipe, be circular and have the same corrugated metal body of annular including the cross-section to and set up in the straight tube at body both ends, the body with straight tube integrated into one piece, the inside and outside wall of body is bright annealing layer, the straight tube outer wall is polishing layer.

Furthermore, the body is provided with ripples with the thickness of 1.1-1.3 mm, the ripple interval is 0.5-0.7 mm, and the crest height is 26-27% of the pipe diameter of the straight pipe.

Further, the straight pipes at the two ends of the body are different in length.

Further, the body is made of 316L stainless steel.

Compared with the prior art, the utility model has the following advantages:

(1) the inner surface and the outer surface of the corrugated pipe are subjected to bright annealing treatment, so that the smoothness of the inner surface and the finish of the outer surface are extremely high, and the outer surface of the straight pipe is subjected to polishing treatment, so that the sealing property is improved.

(2) By adjusting the ratio of the corrugation height, the corrugation thickness and the corrugation distance of the vacuum corrugated pipe, the ductility of the corrugated pipe is improved, the stretching and compressing displacement of the corrugated pipe is ensured, and the service life of the corrugated pipe is prolonged.

(3) The pipe diameter of the body is designed to be less than 10mm, the wall thickness is designed to be 0.15-0.16 mm, and the vacuum switch is small in size, precise, portable and applicable to precise small-specification vacuum switches.

Drawings

Fig. 1 is a schematic view of a vacuum bellows according to an embodiment of the present invention;

Detailed Description

In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.

As shown in figure 1, the utility model comprises a metal body 2 with a circular section and the same annular ripples, and a straight pipe 1 and a straight pipe 5 arranged at the two ends of the body 2, wherein the body 2 is integrally formed with the straight pipe 1 and the straight pipe 5. The inner wall and the outer wall of the body 2 are both bright annealing layers, and the outer walls of the straight pipe 1 and the straight pipe 5 are both polishing layers. The body 2 is treated by a bright annealing process, so that the ductility and the mechanical property of the corrugated pipe are improved while the high smoothness is ensured. The outer wall polishing layers of the straight pipes 1 and 5 are formed by polishing the surfaces of the straight pipes, the polishing layers have high surface smoothness, and the sealing performance when the polishing layers are connected with other parts is improved.

The body 2 is provided with corrugations with the thickness of 1.1-1.3 mm, the space between the corrugations is 0.5-0.7 mm, and the height of wave crests is 26-27% of the diameter of the straight pipe. The special parameter design of body 2 has improved the ductility of bellows, ensures the tensile and compression displacement of bellows, has improved the life-span of bellows.

For the convenience of connection, in a preferred embodiment, the straight pipes 1 and 5 are not of the same length. As shown in figure 1, the length of the stainless steel straight pipe 1 is smaller than that of the stainless steel straight pipe 5, so that the convenience of connection is improved. In another preferred embodiment, the body 2 is made of a 316L thin-walled stainless steel tube, and the grade is not limited to 022Cr17Ni12Mo2, UNS: s31603 and JSI: SUS316L, DIN: 1.4404. The body 2 and the straight pipes 1 and 5 at the two ends are hydraulically and integrally formed without welding, so that the excellent mechanical property of the whole corrugated pipe body is ensured.

The invention has been described with reference to the preferred embodiments, to the above examples which are not intended to limit the invention, and from reading the present description, those skilled in the art will be able to conceive of numerous modifications and variations to this structure, without departing from the inventive concept, any obvious alternative falling within the scope of the invention.

Claims

1. A thin-wall vacuum corrugated pipe comprises a metal body with a circular cross section and the same annular ripples, and straight pipes arranged at two ends of the metal body.

2. The thin-walled vacuum corrugated pipe according to claim 1, wherein the body is provided with corrugations with a thickness of 1.1-1.3 mm, the corrugation pitch is 0.5-0.7 mm, and the height of the wave crest is 26-27% of the pipe diameter of the straight pipe.

3. The thin-walled vacuum bellows of claim 2, wherein the straight tube at the ends of the body is of non-uniform length.

4. The thin-walled vacuum bellows of claim 3, wherein said body is made of 316L stainless steel.