CN2585003Y

CN2585003Y - Limit expansion joint

Info

Publication number: CN2585003Y
Application number: CN 02284273
Authority: CN
Inventors: 魏德哲; 许林坡; 袁林枫
Original assignee: HENAN SHANGDIE VALVE CO Ltd
Current assignee: HENAN SHANGDIE VALVE CO Ltd
Priority date: 2002-11-19
Filing date: 2002-11-19
Publication date: 2003-11-05
Anticipated expiration: 2012-11-19

Abstract

The utility model relates to a limit expansion joint, which comprises an outer telescopic sleeve with a flange coupling end, wherein, one end of the flange coupling end is penetrated in the outer telescopic sleeve, and the other end is penetrated in an inner telescopic pipe with the flange coupling end. The utility model is characterized in that an annular sealing ring is arranged between the outer telescopic sleeve and the inner telescopic pipe and is tightly fixed by a pressing cover with a flange and a compression nut, and the cross section of the annular sealing ring has a ladder structure. The outer telescopic sleeve, the pressing cover and the compression copulate surface of the ladder-shaped sealing ring all have an inclined structure. A stop block is arranged on the outer wall of the inner telescopic pipe and is connected with the outer telescopic sleeve and the flange on the pressing cover through a stop bolt. The compression nut for the pressing cover and a stop anti-falling double nut are arranged on the stop bolt. The utility model has the advantages of the sealing performance of the utility model is reliable because of altering the cross section of the sealing ring, the added stop block can limit the telescopic amount of the telescopic pipe, thus ensuring the safe operation of a pipeline. The joint is especially used for connecting the pipeline with vibration or definite slope and a bent pipeline.

Description

Spacing expansion joint

(1) technical field

The utility model relates to a kind of pipe coupling, especially a kind of spacing expansion joint, be particularly suitable for vibration is arranged or constant slope is arranged and the pipeline that turns round in connect and use.

(2) background technique

Existing pipe coupling with Telescopic has multiple structure, its sealability also respectively has quality, wherein a kind of pipe coupling commonly used, form by outer telescopic tube and interior telescopic tube, be provided with O-ring seals between the two and reach sealing, very easily cause its seal failure in actual use because of the telescopic displacement of pipeline enclosure changes, in case and the O-ring seals ageing failure, just can't adjust and remedy, so that cause integral body to scrap.And do not have limit stoper in this traditional expansion joint, can not guarantee the safe operation of pipeline, especially can not vibration is arranged or constant slope is arranged and the pipeline that turns round in use.

(3) summary of the invention

The purpose of this utility model is just at existing deficiency in the above-mentioned prior art and custom-designed a kind of sealability is reliable, the spacing expansion joint that can limit telescopic pipe maximal dilation amount, this joint be particularly suitable for vibration is arranged or constant slope is arranged and the pipeline that turns round in connect and use.

The purpose of this utility model realizes by following scheme: this spacing expansion joint comprises the outer flexible sleeve that has the flange joining end, the interior telescopic pipe that the one end is installed in the outer flexible sleeve, the other end also has the flange joining end, wherein: be provided with O-ring seal between flexible sleeve and the interior telescopic pipe outward, and tighten up by gland and the gland nut that has flange, the cross section of its O-ring seal is a trapezium structure; The compression fit face of outer telescopic tube, gland and trapezoidal seal ring is ramp structure; The outer tube wall of interior telescopic pipe is provided with limiting stopper, and is connected with flange on outer flexible sleeve, the gland by caging bolt, is provided with gland gland nut and spacing anticreep double nut on caging bolt.

In the utility model, gland and outside be provided with hold-down bolt between the flexible sleeve.

Because the utility model has adopted trapezoidal seal ring, in the process that realizes sealing, can do suitable adjustment by hold-down bolt according to the difference of pressure medium, improved its sealing effect greatly.Moreover, set up limiting stopper on this telescopic pipe, caging bolt links together by this limiting stopper and outer flexible sleeve, and add the double nut locking at the maximal dilation place, so just realize that pipeline can freely stretch in the extending amount that allows, in case its maximal dilation amount of surpassing just plays position-limiting action, because caging bolt of the present utility model defines the extending amount of telescopic pipe, and two end flange are connected with piping flange, be not subjected to the restriction of caging bolt, therefore, the scope of side-play amount of the present utility model and amount of deflection increases, so just effectively guarantee the safe operation of pipeline, be specially adapted to vibration or constant slope arranged and the connection in the pipeline that turns round.

(4) description of drawings

Accompanying drawing is a plan view of the present utility model.

(5) embodiment

The utility model is described further below in conjunction with accompanying drawing: this spacing expansion joint comprises the outer flexible sleeve (1) that has the flange joining end, the interior telescopic pipe (4) that the one end is installed in the outer flexible sleeve, the other end also has the flange joining end, wherein: be provided with O-ring seal (2) between flexible sleeve (1) and the interior telescopic pipe (4) outward, and tighten up by gland (3) and the gland nut (9) that has flange, the cross section of its O-ring seal (2) is a trapezium structure; Outer flexible sleeve (1), gland (3) are ramp structure with the compression fit face of trapezoidal seal ring (2); The outer tube wall of interior telescopic pipe (4) is provided with limiting stopper (8), and be connected with flange on stretch outward sleeve (1), the gland (3) by caging bolt (5), on caging bolt (5), be provided with gland gland nut (9) and spacing anticreep double nut (7), gland (3) and outside be provided with hold-down bolt (6), hold-down bolt (6) and the alternate layout of caging bolt (5) between the flexible sleeve (1).Its effect is can do one by hold-down bolt (6) according to the difference of pressure medium suitably to adjust, and has improved the using effect of this expansion joint widely.

Claims

1, a kind of spacing expansion joint, it comprises the outer flexible sleeve (1) that has the flange joining end, the interior telescopic pipe (4) that the one end is installed in the outer flexible sleeve, the other end also has the flange joining end is characterized in that:

A, be provided with O-ring seal (2) between flexible sleeve (1) and the interior telescopic pipe (4) outward, and tighten up by gland (3) and the gland nut (9) that has flange, the cross section of its O-ring seal (2) is a trapezium structure;

B, outer telescopic tube (1), gland (3) are ramp structure with the compression fit face of trapezoidal seal ring (2);

The outer tube wall of c, interior telescopic pipe (4) is provided with limiting stopper (8), and is connected with flange on stretch outward sleeve (1), the gland (3) by caging bolt (5), is provided with gland gland nut (9) and spacing anticreep double nut (7) on caging bolt (5).

2, spacing expansion joint according to claim 1 is characterized in that: gland (3) and outside be provided with hold-down bolt (6) between the flexible sleeve (1).