CN221323726U

CN221323726U - Metal welding corrugated pipe

Info

Publication number: CN221323726U
Application number: CN202323233122.9U
Authority: CN
Inventors: 吴成静; 张小京; 何昕炜; 刘悦汛; 刘强
Original assignee: Chengdu CAIC Electronics Co Ltd
Current assignee: Chengdu CAIC Electronics Co Ltd
Priority date: 2023-11-28
Filing date: 2023-11-28
Publication date: 2024-07-12
Anticipated expiration: 2033-11-28

Abstract

The utility model discloses a metal welding corrugated pipe, which comprises a corrugated pipe, wherein the corrugated pipe comprises a plurality of first diaphragms and second diaphragms, the first diaphragms and the second diaphragms are staggered and sequentially welded in a sealing way, the first diaphragms and the second diaphragms at two ends of the corrugated pipe are respectively welded with end cover wave plates in a sealing way, and the end cover wave plates at two ends are respectively welded with a first joint and a second joint in a sealing way; the first diaphragm and the second diaphragm both comprise a plane part and an annular elastic part positioned at the outer edge of the plane part, the annular elastic part comprises an annular inclined section and an annular welding section positioned at the outer edge of the annular inclined section, and the inclination directions of the annular inclined section of the first diaphragm and the annular inclined section of the second diaphragm are opposite; the metal welding corrugated pipe of the scheme is stable in structure, long in service life and large in working displacement.

Description

Metal welding corrugated pipe

Technical Field

The utility model relates to the technical field of elastic sensitive elements, in particular to a metal welding corrugated pipe.

Background

In the fields of aviation, aerospace, nuclear power and chemical industry, a metal welding corrugated pipe used on a valve mainly has the functions of isolating a medium, bearing a certain pressure and meeting a certain displacement, wherein the bearing and the displacement simultaneously influence the service life, and the longer the bearing is, the shorter the service life is, the larger the displacement is, and the shorter the service life is.

As shown in fig. 1, when the displacement of the metal welding corrugated pipe exceeds 20% of the total length, the service life can reach the range of tens of thousands to millions, and the service life is longer than that of the metal welding corrugated pipe, which is rare in China; on the one hand, the rotation angle during displacement needs to be reduced to reduce stress in order to improve the service life; on the other hand, the metal welding corrugated pipe is formed by alternately welding inner rings and outer rings through a plurality of diaphragms, the failure mode of the corrugated pipe is usually weld fracture, the first excircle weld joints at two ends are the largest in stress and the most easily broken under the condition of internal pressure, and the first inner circle weld joints at two ends are the largest in stress and the most easily broken under the condition of external pressure through force analysis, so that the problem of improving the strength of the weld joints at two ends becomes a key for prolonging the service life.

Disclosure of utility model

Aiming at the defects in the prior art, the utility model provides a metal welding corrugated pipe, which solves the problems of small working displacement and short service life of the existing metal welding corrugated pipe.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

The utility model provides a metal welding bellows, it includes the bellows spare, and the bellows spare includes a plurality of first diaphragms and second diaphragm, and a plurality of first diaphragms and second diaphragm staggered arrangement and seal welding in proper order, and first diaphragm and second diaphragm that are located the bellows spare both ends respectively with end cover wave plate seal welding, the end cover wave plate that is located both ends respectively with first joint and second joint seal welding.

Further, the first diaphragm and the second diaphragm both comprise a plane part and an annular elastic part positioned at the outer edge of the plane part, the annular elastic part comprises an annular inclined section and an annular welding section positioned at the outer edge of the annular inclined section, and the inclination directions of the annular inclined section of the first diaphragm and the annular inclined section of the second diaphragm are opposite.

Further, two adjacent first diaphragms and second diaphragms with annular inclined sections close to each other are welded in a sealing mode through the annular welding sections, and two adjacent first diaphragms and second diaphragms with annular inclined sections far away from each other are welded in a sealing mode through the plane parts.

Further, the annular inclined section is wavy formed by a plurality of circular arcs, and the arch heights of the circular arcs are sequentially reduced from inside to outside.

Further, the end cover wave plates at the two ends comprise connecting sections which are matched with the annular welding sections of the first diaphragm and the second diaphragm respectively and are welded in a sealing mode, and inner straight pipes which are welded in a sealing mode with the outer side wall of the first joint and the inner side wall of the second joint respectively.

Further, the thickness of the first membrane and the second membrane is smaller than that of the end cover wave plate.

Further, the first diaphragm, the second diaphragm, the end cover wave plate, the first connector and the second connector are all made of metal materials.

The beneficial effects of the utility model are as follows:

the metal welded corrugated pipe is stable in structure, long in service life and large in working displacement, the first diaphragm and the second diaphragm are large in width, the annular inclined section forms a multi-corrugated structure with shallower depth through a plurality of circular arcs, more corrugated diaphragms are smaller in structural rigidity, small in stress during displacement, shallow in arch height of each circular arc, small in stress in all directions of the diaphragms, and service life is prolonged; meanwhile, the welding strength of the first diaphragm and the second diaphragm which are positioned at the end part and the first joint and the second joint respectively can be enhanced through the end cover wave plate, so that the weakest first inner circular welding seam and the weakest first outer circular welding seam which are positioned at the end part in the corrugated pipe assembly are enhanced, and the structural strength and the reliability of the corrugated pipe assembly are improved.

Drawings

Fig. 1 is a schematic structural view of a metal welded bellows in the prior art.

Fig. 2 is a schematic structural diagram of the metal welded bellows according to the present embodiment.

Fig. 3 is an enlarged partial schematic view of the first diaphragm and the second diaphragm.

Fig. 4 is a parameter diagram of fig. 3.

Wherein, 1, a first diaphragm, 2, a second diaphragm, 3, an end cover wave plate, 4, a first connector, 5 and a second connector, 6, a plane part, 7, an annular inclined section, 8, an annular welding section, 9, an arc, 10, a connecting section, 11 and an inner straight pipe.

Detailed Description

The following description of the embodiments of the present utility model is provided to facilitate understanding of the present utility model by those skilled in the art, but it should be understood that the present utility model is not limited to the scope of the embodiments, and all the utility models which make use of the inventive concept are protected by the spirit and scope of the present utility model as defined and defined in the appended claims to those skilled in the art.

As shown in fig. 2 and 3, the metal welded bellows of the present embodiment includes a bellows member, the bellows member includes a plurality of first diaphragms 1 and second diaphragms 2, and the plurality of first diaphragms 1 and second diaphragms 2 are staggered and sealed and welded in sequence.

In the concrete implementation, the first diaphragm 1 and the second diaphragm 2 are wide diaphragms, the first diaphragm 1 and the second diaphragm 2 comprise a plane part 6 and an annular elastic part positioned at the outer edge of the plane part 6, the annular elastic part comprises an annular inclined section 7 and an annular welding section 8 positioned at the outer edge of the annular inclined section 7, the annular inclined section 7 is in a wavy shape formed by five circular arcs 9, the arch heights of the five circular arcs 9 are sequentially reduced from inside to outside, and the inclination directions of the annular inclined section 7 of the first diaphragm 1 and the annular inclined section 7 of the second diaphragm 2 are opposite; adjacent two first diaphragms 1 and second diaphragms 2 of which the annular inclined sections 7 are close to each other are welded in a sealing way through an annular welding section 8, and adjacent two first diaphragms 1 and second diaphragms 2 of which the annular inclined sections 7 are far away from each other are welded in a sealing way through a plane part 6.

The first diaphragm 1 and the second diaphragm 2 which are positioned at the two ends of the corrugated pipe fitting are respectively welded with the end cover wave plate 3 in a sealing way, and the end cover wave plate 3 positioned at the two ends is respectively welded with the first joint 4 and the second joint 5 in a sealing way; in specific implementation, the end cover wave plates 3 at two ends comprise a connecting section 10 which is matched with and welded with the annular welding sections 8 of the first diaphragm 1 and the second diaphragm 2 respectively and an inner straight pipe 11 which is welded with the outer side wall of the first joint 4 and the inner side wall of the second joint 5 respectively in a sealing way; the thicknesses of the first diaphragm 1 and the second diaphragm 2 are smaller than that of the end cover wave plate 3, and the first diaphragm 1, the second diaphragm 2, the end cover wave plate 3, the first connector 4 and the second connector 5 are made of metal materials.

The formula of radial bending stress and axial bending stress of the corrugated pipe fitting in the scheme is as follows:

Wherein R _H is the working radius, R is the variable radius, h is the thickness, E is the elastic modulus, mu is poise Sang Jishu, and theta is the angle between the normal line of the neutral plane upper point and the membrane rotating shaft.

As shown in fig. 4, in the case of the same ripple angle α, the wave distance t of the wide diaphragm is larger, the rotation angle when the wide diaphragm is deformed is smaller in the same displacement, and the stress generated is smaller in the case of satisfying the displacement amount; as can be seen from the above formula, the radial bending stress and the circumferential bending stress of the corrugated pipe are positively related to θ, and the smaller θ is, the smaller the stress is, so that the shallower the corrugation is, which is beneficial to reducing the stress; the arc length of each arc 9 is not suitable to be too long, the arc length is increased, and the angle theta is increased along with the increase; therefore, the scheme adopts the shallow corrugated surface of the five circular arcs 9, so that radial bending stress and circumferential bending stress can be greatly reduced, and the service life of the corrugated pipe can be prolonged as the stress is smaller and the service life is longer.

The metal welding corrugated pipe is stable in structure, long in service life and large in working displacement, and the inner and outer circular weld stresses of the first diaphragm 1 and the second diaphragm 2 are reduced through the shallow corrugated design of the five circular arcs 9, so that the service life is prolonged; through the design of the end cover wave plate 3, the strength of the weak point of the welding seam which is easy to break is improved, the welding seam reliability of the corrugated pipe assembly is integrally improved, and meanwhile, the working displacement is large, and the corrugated pipe assembly can work for tens of millions of times under the condition of 40% of compression.

Claims

1. The utility model provides a metal welding bellows, its characterized in that includes the bellows spare, the bellows spare includes a plurality of first diaphragms and second diaphragm, and a plurality of first diaphragms and second diaphragm staggered arrangement and seal welding in proper order, be located the bellows spare both ends first diaphragm and second diaphragm respectively with end cover wave plate seal welding, be located both ends the end cover wave plate respectively with first joint and second joint seal welding.

2. The metal welded bellows of claim 1 wherein the first and second diaphragms each include a planar portion and an annular spring portion at an outer edge of the planar portion, the annular spring portion including an annular sloped section and an annular welded section at an outer edge of the annular sloped section, the annular sloped section of the first diaphragm being sloped in a direction opposite to the annular sloped section of the second diaphragm.

3. The metal-welded bellows according to claim 2, wherein adjacent two of the first and second diaphragms having annular inclined sections close to each other are sealed and welded by the annular welding sections, and adjacent two of the first and second diaphragms having annular inclined sections distant from each other are sealed and welded by the planar portion.

4. A metal welded bellows according to claim 3, wherein the annular inclined section is wavy formed by a plurality of circular arcs, the arching height of the plurality of circular arcs decreasing in sequence from the inside to the outside.

5. A metal welded bellows according to claim 3 wherein the end cap wave plates at both ends include a connecting section adapted to be sealed with annular welded sections of the first and second diaphragms, respectively, and an inner straight tube sealed with an outer side wall of the first joint and an inner side wall of the second joint, respectively.

6. The metal welded bellows of claim 5 wherein the thickness of the first and second diaphragms are each less than the thickness of the end cap waveplate.

7. The metal welded bellows of claim 1 wherein the first diaphragm, the second diaphragm, the end cap wave plate, the first joint and the second joint are all made of a metal material.