CN202756833U

CN202756833U - Double-seal axial expansion joint

Info

Publication number: CN202756833U
Application number: CN 201220439297
Authority: CN
Inventors: 朱海军; 吴秧平
Original assignee: Jiangsu Morning Twilight Bellows Co Ltd
Current assignee: Jiangsu Morning Twilight Bellows Co Ltd
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2013-02-27
Anticipated expiration: 2022-08-31

Abstract

The utility model discloses a double-seal axial expansion joint which comprises an inlet end pipe, an inlet end ring, a spacing ring, a connecting pipe, an outer pipe, a bellows, an outlet end ring and an outlet end pipe. In order to seal an inner cavity of the bellows effectively, the double-seal axial expansion joint is characterized in that a sealing cover plate is fixedly connected with an outer end face of the outlet end ring, and the sealing cover plate is sleeved on the outlet end pipe in empty mode. A sealing cover plate inner hole is provided with an annular groove, a sealing ring and a sealing plate are embedded in the annular groove, and the sealing ring, the sealing plate and an outlet end outer wall are matched tightly to form a radial double-seal sealing structure. Abrasion-resistant metal layers are arranged on inner walls of the inlet end pipe and the outlet end pipe. After the radial sealing structure is added, the inner cavity of the bellows is separated from the outside, dust, sand and the like can not enter the inner cavity of the bellows easily, and normal use of the expansion joint is guaranteed. By arranging the abrasion-resistant metal layers on the inner walls of the inlet end pipe and the outlet end pipe, abrasion of the inner walls of the inlet end pipe and the outlet end pipe is reduced remarkably, and service life of the expansion joint is prolonged.

Description

The double seal axial expansion joint

Technical field

The utility model relates to a kind of pipe safety device, and specifically, the utility model relates to a kind of corrugated pipe for pipeline expansion joint.

Background technique

Single entry outer pressure axial type expansion joint pressure-bearing is high, and this expansion joint uses more in elevated pressures medium transport pipe network.The bellows inner chamber of the single entry outer pressure axial type expansion joint of prior art is communicated with extraneous, dust, sandstone easily enter wherein, if dust, sandstone are less or the sandstone particle is less, normal use impact on single entry outer pressure axial type expansion joint is little, if but some use occasions, dust, sandstone are more or the sandstone particle is larger, a large amount of dusts, the sandstone that sandstone or particle are larger enter the bellows inner chamber of single entry outer pressure axial type expansion joint, normal use to single entry outer pressure axial type expansion joint produces adverse influence, even can cause the inefficacy of single entry outer pressure axial type expansion joint.

Summary of the invention

The utility model is for the deficiencies in the prior art, propose a kind of simple in structure, can be with the double seal axial expansion joint of bellows inner chamber effective sealing.

The utility model is achieved through the following technical solutions technical goal.

The double seal axial expansion joint comprises entrance point pipe, import end ring, limited ring, adapter, outer tube, bellows, outlet end ring and outlet end pipe, and described bellows is fixedly connected with the adapter at two ends is coaxial, consists of the bellows collocation structure; Described outer coaxial tube empty set is on the bellows collocation structure, and described import end ring, outlet end ring be the coaxial outer tube two ends that are fixedly connected on respectively, and the entrance point pipe is fixedly connected with the import end ring is coaxial; One pipe nipple of described bellows collocation structure is fixedly connected with the interior edge face of outlet end ring, and the other end is taken over and is fixedly connected with limited ring is coaxial, and described outlet end pipe runs through outlet end ring, bellows collocation structure endoporus, is fixedly connected with the limited ring endoporus is coaxial; Its improvements are: at outlet end ring exterior edge face fixed connection and sealing cover plate, described sealed cover empty set is on the outlet end pipe; Be provided with annular groove at described sealed cover endoporus, embedded sealing ring and sealing plate in annular groove, described seal ring, sealing plate form the radial direction double sealing configuration with outlet end pipe outer wall drive fit.

Further technological scheme of the present utility model is: described seal ring is J type rubber seal; Described entrance point pipe, outlet end inner tube wall are provided with the antifriction metal (AFM) layer.

The utility model compared with prior art has following good effect:

1. radial seal structure separates bellows inner chamber and the external world, and dust, sandstone etc. is difficult to enter the bellows inner chamber, has guaranteed the normal use of expansion joint.

Can by adjust sealing plate thickness, adjust seal ring, sealing plate with the cooperation of outlet end pipe outer wall, guarantee sealing effect.

3. entrance point pipe, outlet end inner tube wall are provided with the antifriction metal (AFM) layer, can significantly reduce the wearing and tearing of entrance point pipe, outlet end inner tube wall, prolong the working life of expansion joint.

Description of drawings

Fig. 1 is the utility model structural representation.

Fig. 2 is the I part partial enlarged drawing among Fig. 1.

Embodiment

The utility model is described in further detail with reference to the accompanying drawings and in conjunction with the embodiments for the below.

Double seal axial expansion joint shown in the drawings, comprise entrance point pipe 1, import end ring 2, limited ring 3, adapter 4, outer tube 5, bellows 6, outlet end ring 7 and outlet end pipe 10, adapter 4 coaxial being fixedly connected with at bellows 6 and two ends consist of the bellows collocation structure; Outer tube 5 coaxial empty sets are on the bellows collocation structure, and import end ring 2, outlet end ring 7 be coaxial outer tube 5 two ends that are fixedly connected on respectively, entrance point pipe 1 and import end ring 2 coaxial being fixedly connected with; One pipe nipple 4 of bellows collocation structure is fixedly connected with the interior edge face of outlet end ring 7, the other end adapter 4 and limited ring 3 coaxial being fixedly connected with, and outlet end pipe 10 runs through outlet end ring 7, bellows collocation structure endoporus, with coaxial being fixedly connected with of limited ring 3 endoporus; For with bellows inner chamber effective sealing, of the present utility modelly done following improvement: at outlet end ring 7 exterior edge face fixed connection and sealing cover plates 8, sealed cover 8 empty sets are on outlet end pipe 10; Be provided with annular groove at sealed cover 8 endoporus, embedded sealing ring 9 and sealing plate 11 in annular groove, seal ring 9, sealing plate 11 form the radial direction double sealing configuration with outlet end pipe 10 outer wall drive fits; In the present embodiment, seal ring 9 is selected J type rubber seal; In order to reduce the wearing and tearing of entrance point pipe 1, outlet end pipe 10 inwalls, entrance point pipe 1, outlet end pipe 10 inwalls are provided with the antifriction metal (AFM) layer.

The utility model can be by adjusting the thickness of sealing plate 11, and adjustment seal ring 9, sealing plate 11 cooperate with outlet end pipe 10 outer walls, guarantee sealing effect.

The utility model after increasing radial seal structure separates bellows inner chamber and the external world, and dust, sandstone etc. is difficult to enter the bellows inner chamber, has guaranteed the normal use of expansion joint; Entrance point pipe 1, outlet end pipe 10 inwalls are provided with the antifriction metal (AFM) layer, can significantly reduce the wearing and tearing of entrance point pipe 1, outlet end pipe 10 inwalls, prolong the working life of expansion joint.

Claims

1. double seal axial expansion joint, comprise entrance point pipe (1), import end ring (2), limited ring (3), take over (4), outer tube (5), bellows (6), outlet end ring (7) and outlet end pipe (10), coaxial being fixedly connected with of adapter (4) at described bellows (6) and two ends consists of the bellows collocation structure; The coaxial empty set of described outer tube (5) is on the bellows collocation structure, and described import end ring (2), outlet end ring (7) be coaxial outer tube (5) two ends that are fixedly connected on respectively, entrance point pipe (1) and coaxial being fixedly connected with of import end ring (2); One pipe nipple (4) of described bellows collocation structure is fixedly connected with the interior edge face of outlet end ring (7), the other end is taken over (4) and coaxial being fixedly connected with of limited ring (3), described outlet end pipe (10) runs through outlet end ring (7), bellows collocation structure endoporus, with coaxial being fixedly connected with of limited ring (3) endoporus; It is characterized in that: at outlet end ring (7) exterior edge face fixed connection and sealing cover plates (8), described sealed cover (8) empty set is on outlet end pipe (10); Be provided with annular groove at described sealed cover (8) endoporus, embedded sealing ring in annular groove (9) and sealing plate (11), described seal ring (9), sealing plate (11) form the radial direction double sealing configuration with outlet end pipe (10) outer wall drive fit.

2. double seal axial expansion joint according to claim 1 is characterized in that: described seal ring (9) is J type rubber seal.

3. double seal axial expansion joint according to claim 1, it is characterized in that: described entrance point pipe (1), outlet end pipe (10) inwall are provided with the antifriction metal (AFM) layer.