CN204852750U

CN204852750U - Return bend pressure balance type expansion joint

Info

Publication number: CN204852750U
Application number: CN201520549383.8U
Authority: CN
Inventors: 李世乾; 张小文; 杨玉强; 闫廷来
Original assignee: Luoyang Sunrui Special Equipment Co Ltd
Current assignee: CSSC Shuangrui Luoyang Special Equipment Co Ltd
Priority date: 2015-07-28
Filing date: 2015-07-28
Publication date: 2015-12-09
Anticipated expiration: 2025-07-28

Abstract

The utility model belongs to the appurtenance field specifically is a return bend pressure balance type expansion joint. A bellows (3) and tee bend (5) that's a return bend pressure balance type expansion joint manages (1) including holding, is connected with the nozzle stub is proposed, one end that tee bend (5) were responsible for with bellows (3) connect, the person in charge's the other end is sealed by head (11), the cover has been put and has been strengthened neck area (1) on the branch pipe of tee bend (5), just enhancement neck area (12) and tee bend (5) branch pipe welded connection, the lower extreme of strengthening neck area (12) stretches out the cladding in the attachment weld outside of the tee bend person in charge with the branch pipe to both sides, and tee bend person in charge welded connection. The utility model discloses reduced the stress at three -way owner branch connection position, avoided high temperature hot wall working condition under the makeup weld the tee bend looks transversal welding seam fracture phenomenon that the system tee bend caused greatly in response to power.

Description

A kind of bend pipe pressure balance type expansion joint

Technical field

The utility model belongs to piping attachment field, is specially a kind of bend pipe pressure balance type expansion joint.

Background technique

Bend pipe pressure balance type expansion joint be one can change MEDIA FLOW to, compensate pipeline axial or axial lateral displacement combination restricted type expansion joint.In the application process of bend pipe pressure balance type expansion joint, change MEDIA FLOW to tee pipe fitting often select steel butt seamless pipe, and in each standard specification of steel butt seamless pipe, threeway maximum diameter is DN1500, the tee pipe fitting that latus rectum is greater than DN1500 is there is in practical application, when latus rectum is greater than DN1500, normal employing supervisor and arm respectively jigsaw roll up round making, and carry out large opening supervisor, adopt GB/T20801.4-2006 " pressure piping specification-industrial pipeline manufacture and installation " Fig. 7-7(a), (b) arm connect weld seam form carry out being responsible for and being welded to connect of arm, and normal appearance is responsible for and arm attachment weld failure phenomenon in the application.Welded structure at high temperature needs the intensity considering weld zone to reduce factor, and therefore, under worst hot case, the Stress Check of jigsaw welded tee is difficult to pass through, and needs to increase more wall thickness to reduce stress, or by strengthening threeway.It is that single reinforcement is strengthened, dish-style is strengthened that conventional equal tee strengthens mode.

Model utility content

For bend pipe pressure balance type expansion joint in the application because supervisor is high due to combined stress level with arm attachment weld, often occur the failure phenomenon of weld cracking, the purpose of this utility model proposes a kind of bend pipe pressure balance type expansion joint.

The utility model adopts following technological scheme for completing above-mentioned purpose:

A kind of bend pipe pressure balance type expansion joint, described bend pipe pressure balance type expansion joint includes end pipe, the bellows be connected with short tube and threeway; One end of described threeway supervisor is connected with described bellows, and the other end of supervisor is closed by end socket; The arm of described threeway is equipped with reinforcement neckstrap, and described reinforcement neckstrap is connected with the described branch pipe welding of threeway; The lower end of described reinforcement neckstrap stretch out to both sides be coated on threeway supervisor and arm attachment weld outside, and to be welded to connect with the supervisor described in threeway.

A kind of bend pipe pressure balance type expansion joint that the utility model proposes, adopt and be nested with the reinforcement neckstrap on tee branch, and reinforcement neckstrap and the supervisor described in threeway are welded to connect, weld seam between tee branch and supervisor is strengthened, reduce the stress of the primary branch connection part of threeway, avoid the threeway intersection welding seam cracking phenomena that jigsaw welded tee stress under high temperature hot wall working condition causes greatly; Pipeline wall thickness economy is increased than simple, and strengthen neckstrap and primary branch defines hot case, temperature gradient reduces, thermal stress reduces, when avoiding single reinforcement reinforcement, dish-style reinforcement, stiffening rib and main body intersection welding seam closely, cause welding heat affected zone to expand simultaneously, the problem of easy generation weld defect, therefore uses the more economical safety of bend pipe pressure balance type expansion joint of special reinforcement threeway under worst hot case.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model.

Fig. 2 is the structural representation of threeway in the utility model.

Fig. 3 is I magnified partial view in Fig. 2.

In figure: 1, end pipe, 2, end plate, 3, work bellows, 4, intervalve, 5, threeway, 6, large pull bar, 7, balance bellows, 8, taper faced washer, 9, spherical washer, 10, nut, 11, end socket, 12, strengthen neckstrap.

Embodiment

With specific embodiment, the utility model is illustrated by reference to the accompanying drawings:

As shown in Figure 1, and with reference to Fig. 2, Fig. 3, a kind of bend pipe pressure balance type expansion joint, described bend pipe pressure balance type expansion joint includes end pipe 1, the bellows 3 be connected with short tube and threeway 5; One end that described threeway 5 is responsible for is connected with described bellows 3, and the other end of supervisor is closed by end socket 11; The arm of described threeway 5 is equipped with and strengthens neckstrap 12, and described reinforcement neckstrap 12 is connected with the described branch pipe welding of threeway 5; The lower end of described reinforcement neckstrap 12 stretch out to both sides be coated on threeway supervisor and arm attachment weld outside, and be welded to connect with the supervisor described in threeway, strengthening neckstrap with the main weld seam propped up is stressed non-pressure weld seam, mainly bear the flexural stress caused because of pressure in the discontinuous district of structure, should ensure the intensity of weld seam, other additional structure is with the bend pipe pressure balance type expansion joint in GB/T12777 metal corrugated pipe expansion joint general technical specifications.

Claims

1. a bend pipe pressure balance type expansion joint, is characterized in that: described bend pipe pressure balance type expansion joint includes end pipe (1), the bellows (3) be connected with short tube and threeway (5); One end that described threeway (5) is responsible for is connected with described bellows (3), and the other end of supervisor is closed by end socket (10); The arm of described threeway (5) is equipped with and strengthens neckstrap (1), and described reinforcement neckstrap (12) is connected with the described branch pipe welding of threeway (5); The lower end of described reinforcement neckstrap (12) stretch out to both sides be coated on threeway supervisor and arm attachment weld outside, and to be welded to connect with the supervisor described in threeway.