CN201748058U

CN201748058U - Composite tube connecting piece

Info

Publication number: CN201748058U
Application number: CN2009202551978U
Authority: CN
Inventors: 李铁良; 张红斌
Original assignee: Xinxing Ductile Iron Pipes Co Ltd
Current assignee: Xinxing Ductile Iron Pipes Co Ltd
Priority date: 2009-12-22
Filing date: 2009-12-22
Publication date: 2011-02-16
Anticipated expiration: 2019-12-22

Abstract

The utility model discloses a composite tube connecting piece, which structurally comprises a compacting coupled piece arranged at the tube end of a connecting tube undergoing expanding treatment, and also includes a bush disposed in an expanding end of a tube, and an annular serrated face is disposed on the internal surface of the compacting coupled piece matched with the tube end of the connecting tube for increasing the friction force. The utility model has the advantages: a pipe fitting is provided with a bush the material of which is the same with the inside material of the composite tube after the expanding treatment, the compacting coupled piece employs a snap ring the internal surface of which is equipped with an annular serrated face as well as a threaded ring to be connected with the tube expanding part, a connecting nut is disposed between the snap ring and the threaded ring, two sealing rings disposed on the bush can effectively prevent corrosion to the outside material of the composite tube due to leakage of liquid or gas conveyed by a pipeline from ring gaps formed by butt joint of tubes, thereby extending the service life of pipe fittings, reducing the loss of liquid or gas delivery, and eliminating environment pollution caused by liquid or gas escape.

Description

The composite pipe link

Technical field

The utility model relates to a kind of pipe joint, particularly a kind of composite pipe link.

Background technique

The composite pipe pipeline connects employing and similar connecting means and the linkage structure of common pipe linkage structure usually at present, normally will connect the composite pipe pipe end expands mouthful and to handle, O-ring seal is installed in the composite pipe docking site, the outer installment screw thread compresses coupling spare, though this Placement can play interconnect function to a certain extent, but because general liquid or the gas that uses composite pipe to carry all has special nature, such as having corrosivity or toxicity, and the use of composite pipe inner layer material can effectively prevent the liquid of carrying or gas to the destructive effects of cladding material, if compressing coupling spare in connection procedure connects not tight, the seal ring of joint can produce aging after use a period of time, cause easily the liquid of carrying or gas contact with the composite pipe cladding material, and then destruction cladding material, cause leakage, not only cause environmental pollution, bring certain harm and economic loss also can for operation or user.

The model utility content

The utility model provides a kind of composite pipe link, causes the gas carried or liquid to the outer field infringement of composite pipe to solve composite pipe internal layer butt joint imprecision, thereby avoids befouling environment, reduces the loss of institute's conveying gas or liquid.

For the technological scheme that solves the problems of the technologies described above employing is: the composite pipe link, comprise the coupling spare that compresses that is installed in through mouthful connecting tube pipe end of handling that expands in its structure, its key improvements is: also comprise a lining of being located in bloated mouthful of end of tubing in its structure, the internal surface that compresses coupling spare that cooperates with the connecting tube pipe end is provided for increasing the band saw flank of tooth of frictional force.

Described lining two ends are consistent with bloated mouthful of end inner wall shape of two tubing that will connect respectively, and seal ring is housed.

The described coupling spare that compresses comprises and tubing bloated mouthful of a snap ring and a threaded collar that end is equipped with that snap ring and threaded collar internal surface are provided for increasing the band saw flank of tooth of frictional force.

Describedly compress the nut that coupling spare also comprises fastening usefulness, nut one side and snap ring clamping, opposite side is connected with the outside thread of threaded collar is supporting.

Bloated mouthful of end inner wall shape of described lining one end and tubing is consistent, and seal ring is housed, and the other end is provided with the annulus sealing surface with the connection pipe fitting fitted seal of wanting.

Described compress coupling spare comprise be arranged on tubing expand mouthful snap ring of end and with the nut of snap ring clamping, nut and the screw-thread fit that is arranged on the pipe fitting.

Also comprise the pipe fitting port that is arranged on and will be connected and the seal ring between the lining annulus sealing surface in the structure.

Adopt the beneficial effect that technique scheme produced to be: the mounting material lining the same after the tubing that needs connect is handled through the mouth that expands with the tubing inner layer material, and seal ring is set at lining and tubing or pipe fitting contact position, compressing the snap ring that coupling spare adopts internal surface that the band saw flank of tooth is set is connected with the bloated oral area position of threaded collar and tubing, between snap ring and the threaded collar attaching nut is set, adopts the snap ring of this built-in band saw flank of tooth and its anti-pull-out force of threaded collar obviously to strengthen; The two seals circle that is arranged on the lining can prevent effectively that liquid or gas that pipeline is carried from corroding the composite pipe cladding material by the annular space seepage that the tubing butt joint forms, thereby improve pipe fitting working life, reduce the loss of the liquid of carrying or gas, stop the environmental pollution that causes because of liquid or gas leak.Through the related composite pipe link non-displacement under three times of nominal pressure conditions of tubing of experimental examination the utility model, good sealing effect.

Description of drawings

Structural representation when Fig. 1 the utility model is applied to the tubing connection;

Structural representation when Fig. 2 the utility model is applied to tubing and is connected with pipe fitting;

1, tubing; 2, snap ring; 3, lining; 4, nut; 5, seal ring; 6, threaded collar; 7, seal ring; 8, pipe fitting;

Further the utility model is described in detail below in conjunction with accompanying drawing.

Embodiment

For making above-mentioned purpose of the present utility model, feature and beneficial effect can become apparent more, below in conjunction with the drawings and specific embodiments among the utility model embodiment, the technological scheme among the utility model embodiment are clearly and completely described.

Embodiment 1

Referring to accompanying drawing 1, the composite pipe link, be used for being connected of tubing and tubing, comprise the coupling spare that compresses that is installed in through mouthful connecting tube tubing end of handling of expanding in its structure, its key improvements is: also comprise a lining of being located in bloated mouthful of end of tubing in its structure, the internal surface that compresses coupling spare that cooperates with the connecting tube pipe end is provided for increasing the band saw flank of tooth of frictional force.

Above-mentioned lining 3 two ends are consistent with 1 bloated mouthful of end of two tubing inner wall shape that will connect respectively, and seal ring 5 is housed.

Above-mentioned compress that coupling spare comprises and expand in the tubing end mouthful a snap ring 2 and a threaded collar 6 that the place is equipped with, snap ring 2 and threaded collar 6 internal surfaces are provided for increasing the band saw flank of tooth of frictional force.Before expanding mouthful processing, the tubing end should earlier snap ring, nut and threaded collar be sleeved on the tubing, the notch portion tapering that expands should cooperate with the circular saw face cone degree that is provided with on snap ring and the threaded collar internal surface, with the frictional force between the increase tubing and the band saw flank of tooth.Nut 4 one sides and snap ring 2 clampings, opposite side is connected with the outside thread of threaded collar 6 is supporting.The ring-shaped step of evagination is set on the snap ring, and nut one side is provided with the annular shoulder block of convex, should be earlier before snap ring is installed with spiro cap on snap ring.

In the concrete application process: at first be installed in a connecting end with snap ring 2 and nut 4 are supporting, threaded collar 6 is installed in the another one connecting end, then two connecting ends are expanded mouthful and handle, the tubing connecting end is inserted at lining 3 two ends, at last nut 4 is tightened on the threaded collar 6, realizes being tightly connected of tubing and tubing.

Embodiment 2

Referring to accompanying drawing 2, the composite pipe link is used to connect tubing and pipe fitting, pipe fitting can be elbow, threeway or other supporting pipe fittings, 1 bloated mouthful of end of lining 3 one ends in the link and tubing inner wall shape is consistent, and seal ring is housed, the other end be provided with the annulus sealing surface of the connection pipe fitting of wanting 8 fitted seal, to adapt to the connection between tubing and the pipe fitting, tubing expand mouthful snap ring 2 at place and with the nut 4 of snap ring 2 clampings, nut 4 and the screw-thread fit that is arranged on the pipe fitting 8 are provided with seal ring 7 between pipe fitting 8 ports and the lining 3 annulus sealing surfaces.

In the concrete application process: when tubing 1 is connected with pipe fitting 8, at first with snap ring 2 and nut 4 supporting tubing 1 connecting ends that are installed in, then tubing 1 connecting end is expanded mouthful and handle, lining 3 and bloated mouthful of corresponding to end of end inwall of tubing are inserted tubing 1 a bloated notch portion, there is pipe fitting 8 connecting ends and lining 3 annular sealing surface one end to dock, and seal ring 7 is installed, and screw nut 4, realize being tightly connected of tubing 1 and pipe fitting 8.

Claims

1. composite pipe link, comprise the coupling spare that compresses that is installed in through mouthful connecting tube pipe end of handling that expands in its structure, it is characterized in that: also comprise a lining (3) of being located in bloated mouthful of end of tubing in its structure, the internal surface that compresses coupling spare that cooperates with the connecting tube pipe end is provided for increasing the band saw flank of tooth of frictional force.

2. composite pipe link according to claim 1 is characterized in that: described lining (3) two ends are consistent with bloated mouthful of end inner wall shape of two tubing (1) that will connect respectively, and seal ring (5) is housed.

3. composite pipe link according to claim 1 and 2, it is characterized in that: described compress that coupling spare comprises and tubing expands mouthful a snap ring (2) and a threaded collar (6) that end is equipped with, snap ring (2) and threaded collar (6) internal surface are provided for increasing the band saw flank of tooth of frictional force.

4. composite pipe link according to claim 3 is characterized in that: describedly compress the nut (4) that coupling spare also comprises fastening usefulness, nut (4) one sides and snap ring (2) clamping, the supporting connection of outside thread of opposite side and threaded collar (6).

5. composite pipe link according to claim 1 is characterized in that: described lining (3) one ends and tubing (1) mouthful end inner wall shape that expands is consistent, and seal ring is housed, the other end be provided with the annulus sealing surface of the connection pipe fitting of wanting (8) fitted seal.

6. composite pipe link according to claim 1 or 5 is characterized in that: described compress coupling spare comprise be arranged on tubing expand mouthful snap ring (2) of end and with the nut (4) of snap ring (2) clamping, nut (4) and the screw-thread fit that is arranged on the pipe fitting (8).

7. composite pipe link according to claim 6 is characterized in that: also comprise in its structure be arranged on the pipe fitting that will be connected (8) port and lining (3) annulus sealing surface between seal ring (7).