CN201475544U - Hydraulic pipe plane sealing device - Google Patents

Abstract

The utility model relates to a hydraulic pipe plane sealing device. The end of a pipe body (11) is a double-folding edge flange (16) with a bending belt, a lining sleeve (12) consists of a pipe sleeve (19) and a shoulder part (14), the cross section of the lining sleeve (12) is in an L shape, an inner cylindrical surface (29) of the pipe sleeve (19) is tightly matched with the outer surface (22) of the pipe body (11), an inner extension part (18) and an outer extension part (17) of the double-folding edge flange (16) are tightly combined with the shoulder part (14) of the lining sleeve (12), wherein an outer surface (37) of the shoulder part (14) is pasted with an outer extension radial surface (23) of the double-folding edge flange (16), and a screw nut (13) is sheathed on the pipe body (11). The utility model overcomes the defect of short service life in the prior art caused by poor contact effect between a steel pipe and the surface of the lining sleeve, the carrying capability of the pipe joint is enhanced, and at the same time, the fatigue life of the pipe joint can be effectively prolonged.

Description

A kind of hydraulic tube flat seal

Technical field

The utility model relates to hydraulic fitting, particularly the end face of hydraulic fitting and connection set.

Background technique

Present hydraulic fitting type is more, comprises transition type pipe joint, Bite type fittings, Three way type pipe joint, nonstandard formula pipe joint, flared fitting, right-angle type pipe joint, rotary pipe joint, rapid pipe joint, stainless steel joint for pipeline, copper sleeve etc.How to guarantee fastening between the high-pressure hydraulic parts, zero leakage connects and all is one all the time and has challenging problem, and uneven pressure distribution makes and bears the harsh load capacity difficulty more that becomes on the hard tube wall.In general, hydraulic tube or joints of rigid pipes all are threaded, and long-neck nut and aligning are installed on pipe, are pressed together managing enlarging or flange face and respective areas of contact, to form the sealing relationship between two links.This pipe joint generates uneven pressure distribution easily on tube-surface in the process of tightening nut and flange face, cause the changeover portion of straight section and enlarging or flange, cracks situations such as curved bel cracking along the tube wall curved bel.The hydraulic tube assembly that improvement is threaded is by insert the lining that is shaped in advance between nut and pressure contact surface (enlarging or flange), but also there are some problems in this method, because size there are differences when buying hydraulic tube, the matching degree between preformed liner and the steel pipe also differs widely; In addition, the surface itself of shaping lining or flange face just not exclusively mates with corresponding butting surface separately, mounting bush tension and be not easy to cooperate with pipe end, may produce the tube outer surface impression, if lining is excessive or surface configuration and tube wall curved bel radius are not inconsistent, contact between lining and the steel pipe is just inhomogeneous, the tube-surface impression makes stress increase with inhomogeneous the contact, produce little crackle, contact between steel pipe and the sleeve surface is undesirable also may to cause the tube wall crack, thereby has limited the pipe joint bearing capacity and reduced fatigue life.

The model utility content

The utility model is easy to crack at above pipe joint, and fatigue life, low deficiency provided a kind of hydraulic tube flat seal.

The utility model adopts following technological scheme:

A kind of hydraulic tube flat seal comprises body, lining, and nut, the end of described body is the double-turnup flange that curved bel is arranged, and lining is made of pipe box and shoulder, and the section of lining is Shape, the inner periphery of pipe box cooperates with the intimate of body, the shoulder of double-turnup flange inner chambers in an imperial palace part, epitaxial part and lining is combined closely, and wherein the overhanging radial surface of the outer surface of shoulder and double-turnup flange is fitted, and described nut sky is enclosed within on the body.

As a kind of improvement of the present utility model: described double-turnup flange inwardly stretches into internal diameter that part the forms internal diameter smaller or equal to body, and in stretch into internal diameter that part forms more than or equal to 80% of internal diameter of tube body.

As another improvement of the present utility model: the internal diameter at the internal thread place of described nut is greater than the external diameter of shoulder, when nut is connected with the band male connection that matches, the interior shoulder of nut carries out pressure with the internal surface of the shoulder of lining and contacts, a nut contact bush, any position of not direct contact tube or steel pipe double-turnup flange.

Useful technique effect of the present invention is that the contact between lining and the steel pipe is even, has strengthened the pipe joint bearing capacity, can effectively prolong the fatigue life of pipe joint simultaneously.

Description of drawings

Fig. 1 is the utility model structural drawing.

Fig. 2 is the utility model sectional view.

Embodiment

By shown in Figure 1, the utility model comprises body 11, lining 12, and nut 13, the end of described body 11 is the double-turnup flange 16 that curved bel is arranged, and lining 12 is made of pipe box 19 and shoulder 14, and the section of lining 12 is

Shape, the inner periphery 29 of pipe box 19 closely cooperates with the outer surface 22 of body 11, double-turnup flange 16 inner chambers in an imperial palace's parts 18, epitaxial part 17 are combined closely with the shoulder 14 of lining 12, wherein the outer surface 37 of shoulder 14 is fitted with the overhanging radial surface 23 of double-turnup flange 16, and described nut 13 skies are enclosed within on the body 11.

The nut 13 that has internal thread 26 and the shoulder 28 that directly inwardly prolongs is used for being connected usefulness with the band male connection that matches.Nut 13 has the diameter endoporus 25 bigger slightly than the external diameter of lining 12 first portions 19.Nut 13 is installed on the steel pipe, and in actual use, when being connected with mated surface, the shoulder of nut 13 28 stretches, and carries out pressure with the internal surface 24 of the shoulder 14 of lining 12 and contacts.13 contact bushes 12 of nut, any position of not direct contact tube 11 or steel pipe double-turnup flange 16.

As shown in Figure 2, the utility model adopts double-turnup flange 16, and pressure is applied to O shape planar seal ring in the O shape ring recess 32 on the part surface that matches.The outer surface 38 that inwardly prolongs part 18 for the footpath of guaranteeing flange flange 16 forms sealing with the part surface that matches, inwardly stretch into the internal diameter C of the internal diameter A of part 18 formation smaller or equal to body 11, test shows, as long as diameter A is less than or equal to the internal diameter C of the pipe 11 adjacent with the first portion 19 of rigid liner 12 and less than O shape circle internal diameter B, O shape circle can under high pressure show good performance.Yet must be noted that must guarantee the double-turnup flange in stretch part 18 and excessively do not extend in the steel pipe 11, otherwise the flow that can influence steel pipe 11 produces throttling, in stretch into the internal diameter A that part 18 forms and be advisable more than or equal to 80% of body 11 internal diameter C.

Claims (3)

1. hydraulic tube flat seal, comprise body (11), lining (12), nut (13), it is characterized in that: the end of described body (11) is the double-turnup flange (16) that curved bel is arranged, lining (12) is made of pipe box (19) and shoulder (14), the section of lining (12) is L shaped, the inner periphery (29) of pipe box (19) closely cooperates with the outer surface (22) of body (11), inner chambers in an imperial palace's part (18) of double-turnup flange (16), epitaxial part (17) is combined closely with the shoulder (14) of lining (12), wherein the outer surface (37) of shoulder (14) is fitted with the overhanging radial surface (23) of double-turnup flange (16), and described nut (13) sky is enclosed within on the body (11).

2. a kind of hydraulic tube flat seal according to claim 1, it is characterized in that: described double-turnup flange (16) inwardly stretches into internal diameter that part (18) the forms internal diameter smaller or equal to body (11), and in stretch into internal diameter that part (18) forms more than or equal to 80% of body (11) internal diameter.

3. a kind of hydraulic tube flat seal according to claim 1 and 2, it is characterized in that: the internal diameter that the internal thread (26) of described nut (13) is located is greater than the external diameter of shoulder (14), when nut (13) is connected with the band male connection that matches, the interior shoulder (28) of nut (13) carries out pressure with the internal surface (24) of the shoulder (14) of lining (12) and contacts, nut (a 13) contact bush (12), any position of not direct contact tube (11) and steel pipe double-turnup flange (16).

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