CN2459514Y

CN2459514Y - Thin wall stainless steel high-pressure water pipe joint

Info

Publication number: CN2459514Y
Application number: CN 01213950
Authority: CN
Inventors: 赵正河; 廖仲力
Original assignee: APPLIED TECHNOLOGY DEVELOPMENT CO SICHUAN PROV
Current assignee: APPLIED TECHNOLOGY DEVELOPMENT CO SICHUAN PROV
Priority date: 2001-01-17
Filing date: 2001-01-17
Publication date: 2001-11-14
Anticipated expiration: 2011-01-17

Abstract

The utility model relates to a joint for a thin wall stainless steel high-pressure water pipe. The water pipe uses thin wall stainless steel to be welded with a steel pipe; flanges of the pipe ends are arranged between a pressing sleeve and a sealing pad which are arranged in a cavity formed from a nut and a joint body, wherein, the nut and the joint body are respectively provided with inner and outer screw threads, and the inner and the outer screw threads are engaged; in addition, the front end of the pressing sleeve is provided with a shrinking conical surface or an arc-shaped convex surface body of a lug boss. The joint is provided with an annular sealing chamber. A force transferring surface between the rear end of the pressing sleeve and the nut is a conical surface, and the pressure transferring is uniform. The joint has the advantages of good sealing performance, strong anti-releasing force, convenient installation and low cost, and the bearing pressure can reach more than 10MPa.

Description

Thin-wall stainless steel high-pressure water pipe joint

A kind of stainless steel high-pressure water pipe joint is used for various water supply pipline systems.Be fit to the water pipe caliber at 8～300mm, the welded stainless steel pipe of wall thickness in 0.3～3mm scope.

China utility model patent bulletin on May 6th, 1998 disclosed the patent (CN2280824Y ZL96245296.3) that name is called " a kind of thin walled tube linkage structure ".The defective of this patent is: 1. outside thread nut 3 end faces and the fragile thin walled tube flange of thin walled tube 4 flange contact facings direct friction when tightening, cause leakage easily.2. outside thread nut 3 end faces are planar end surface, thin walled tube 4 flanges after compressing can not after turn over, add that sealing gasket 2 is squeezable rubber, make that to be connected the anti-pulling-out force of thin walled tube little, pull easily.3. this structure is difficult to the reasonable compression ratio of control rubber seal in construction, pressed pine, and seal and pressure bearing power is low, presses too tightly, and ageing of rubber is fast, and the life-span is short.4. outside thread nut 3 in use becomes flexible because of the water pipe vibration easily.5. the straight coupling 1 internal thread ear end face of this joint structure, anufacturability relatively poor (ear end face is dark, and processing is difficulty) quality is difficult for stable the assurance, causes sealing effect poor.China's utility model patent bulletin disclosed name and has been called " stainless steel joint for pipeline " patent (CN2281460Y ZL97211578.1) on May 13rd, 1998.The defective of this patent is: the flared end end face of connected tube 10, and after expanding tapered opening shape, might not be perpendicular to tube axis, and also end face not necessarily smooth (unless through machining) once more is so seal and pressure bearing power is low, poor stability, and sealing life is short.

The purpose of this utility model provides a kind of thin-wall stainless steel high-pressure water pipe joint, solves the defective of above-mentioned joint, realize that sealability is stable, joint bears the pressure height, anti-pulling-out force is big, the life-span is long, and cost is low, installs easily manufactured.

Thin-wall stainless steel high-pressure water pipe joint, have and be with externally threaded fittings body 1, tapped gland nut 2, gland 4, sealing gasket 3, it is characterized in that water pipe adopts thin-wall stainless steel 5 and termination band flange 5.1, and place between gland and the sealing gasket, compress end before this place's gland for the arc convex body 4.2 or the boss arc convex body 4.3 of inside and outside contraction tapering are arranged.Fittings body 1 inner headed face begins to have one section overhanging guiding stable section 1.1 from seal face 1.2.Be provided with " O " shape seal ring 6 between the outer and gland nut of gland rear end thin-wall steel tube, scribble locking glue 8 between fittings body and nut on the thread engagement, form annular seal space with the sealing at sealing gasket 3 places, and form double seal.The fittings body sealing surface 1.2 that contacts with sealing gasket is curved surface.

Description of drawings

Fig. 1 the utility model structure is always schemed

Fig. 2 arc convex body 4.2 structural drawing

Fig. 3 boss arc convex body 4.3 structural drawing

Embodiment:

See Fig. 1; thin-wall stainless steel water pipe 5 termination band flange 5.1, place between gland 4 and the sealing gasket 3, compress the arc convex body 4.2 (seeing Fig. 1, Fig. 2) that end has inside and outside contraction tapering before the gland; perhaps be boss arc convex body 4.3 (see figure 3)s, flange 5.1 kernel of section lines 00 ₂With steel pipe shaft axis 00 ₁Between angle α be 15 °～135 °, be 90 ° (seeing Fig. 2, Fig. 3) herein.2 power transmission faces of gland rear end and gland nut are the conical surface 4.1, when fastening nut, make steel pipe flange pressurized by power transmission face 4.1 and gland convex front surface body, turn over (as the dotted line position of flange among Fig. 2, Fig. 3) under pressure behind flange 5.1 outsides.The guiding stable section 1.1 that circle stretches out in the fittings body 1, changeable as required." O " shape seal ring 6, locking glue 8 and sealing gasket 3 etc. form annular seal space.Locking glue 8 can be used anaerobic adhesive.The outer surface 2.1 of gland nut 2 and the non-threaded outer surface of fittings body 1 1.3 are that even number is (as 2,4,6,8,12 ...) many faceted pebbles, conveniently to tighten.In the permanent pipe coupling of burying underground, prepare radially check pin 7 between nut and the fittings body.Fittings body and nut are made of Cuprum alloy or stainless steel material, the gland metallic material, and sealing gasket is made " O " shape seal ring organic material with non-toxic anticorrosion erosion metal and organic material.The fittings body of above-mentioned joint can be elbow, threeway, straight joint, valve and tap etc.

The beneficial effects of the utility model:

1. this joint bearing capacity height cannot leak brokenly when hydraulic pressure is 10MPa.

2. the anti-pulling-out force of joint is big, after Sheet Steel Pipe termination flange is compressed by gland, turns over stuckly after can being out of shape, and has increased anti-pulling-out force.

3. in the place of fitting operation spare (as tap, valve), long guiding stable section is set in the fittings body, increases stability.

4. the power transmission face between gland rear end and nut is the conical surface, and is good to neutrality when joint is compressed, stress equalization on the garden annular sealing surface of sealing gasket.The arc convex body of the gland front end application of force makes the contact stress on the radial cross section of sealing gasket big, does not have sudden change, can not damage the Stainless Steel Tube flange.So the bearing capacity height, the life-span is long.

5. because the gland that is provided with is a separate piece, be not one with threaded nut, therefore when mounted in the fastening nut process, compressing end before the gland can not rub mutually with the pipe flange, connected two sections pipes can not rotate thereupon yet, thin-wall steel tube flange and sealing gasket can not abraded, and sealing life is long.

6. take up an area of and lack, the good installation: a. pipe without screw thread, one time fastening nut gets final product.During pressure testing as find leaking, nutting again, this moment, gland pressure increased, and reached seal request.B., it is little that the turning radius is installed, because two sections pipes all do not rotate when installing, the turning radius is the turning radius of nut during installation, rather than the radius of much bigger joint and valve, so the Fabric pipe is compact, takes up an area of few.C. mounting or dismounting are very easy to: only need nut is unclamped, then steel pipe and joint can be taken apart.If want reconfiguration to increase easily, do not need to destroy wall or mounting bracket in the use with point.

7. good manufacturability: the pipe flange is used the special tool manufacturing easily, and fittings body, nut, sealing gasket, gland, the manufacturing of " O " shape seal ring are simple, and cost is low.

8. cost reduced greatly after this joint water pipe adopted thin-wall stainless steel.Sealing gasket adopts material such as non-toxic anticorrosion erosion metal or teflon, reasonable integral structure in addition, make this joint not only sealing life long, and wholesomeness is good, and is attractive in appearance, suitable.

Claims

1. thin-wall stainless steel high-pressure water pipe joint, have and be with externally threaded fittings body (1), tapped gland nut (2), gland (4), sealing gasket (3), it is characterized in that water pipe adopts thin-wall stainless steel (5) and termination, joint band flange (5.1), and place between gland and the sealing gasket, compress end before this place's gland for the arc convex body (4.2) or the boss arc convex body (4.3) of inside and outside contraction tapering are arranged.

2. by the described joint of claim 1, it is characterized in that the force surface between gland (4) rear end and gland nut is the conical surface (4.1).

3. by the described joint of claim 1, it is characterized in that fittings body (1) inner headed face begins to have one section overhanging guiding stable section (1.1) from seal face (1.2).

4. by the described joint of claim 1, it is characterized in that the gland rear end, outside the thin-wall steel tube (5), be provided with " O " shape seal ring (6) between gland nut (2); Scribble locking glue (8) on thread engagement between fittings body and nut, the fittings body sealing surface (1.2) that contacts with sealing gasket is a curved surface.

5. by the described joint of claim 1, it is characterized in that water pipe termination flange (5.1) kernel of section line 00 ₂With steel pipe shaft axis 00 ₁Between angle α be 15 °～135 °.

6. by the described joint of claim 1, it is characterized in that gland nut outer surface (2.1) and the non-threaded outer surface of fittings body (1.3) are many faceted pebbles.

7. by the described joint of claim 1, it is characterized in that in burying nonvolatil pipeline underground, prepare radially check pin (7) between nut and the fittings body.

8. by the described joint of claim 1, it is characterized in that fittings body and nut are with Cuprum alloy or stainless steel material; The gland metallic material; Sealing gasket (3) is made of non-toxic anticorrosion erosion metal and organic material; " O " shape seal ring (6) is made of organic material.

9. by the described joint of claim 1, it is characterized in that fittings body is elbow, threeway, straight joint, valve, tap.