CN1227472C

CN1227472C - Loose joint pipe fittings of high pressure and quick connection for stainless steel tube

Info

Publication number: CN1227472C
Application number: CN 03117216
Authority: CN
Inventors: 廖仲力
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-01-23
Filing date: 2003-01-23
Publication date: 2005-11-16
Anticipated expiration: 2023-01-23
Also published as: CN1431418A

Abstract

The present invention relates to the connection of stainless steel pipes with thin walls. Two steel pipes to be connected are respectively sheathed in a nut with inner screw threads and a screw ring inner hole which has outer screw threads and is matched with the nut; the ends of the two steel pipes are vertically flanged; the former flange is provided with a sealing washer between the two flanges, and the latter flange is provided with a complete stainless steel inner-expanding sealing sleeve which is composed of two conical pipes and a sealing seat connected with a double-sealing ring or is composed of a sealing ring and a conical pipe. The former steel pipe ensures the end opening roundness through the flange and the washer to bear the pressure for more than 10Mpa, has simple structure and easy installation, and is suitable for connecting pipes which are shorter than 50mm. The latter steel pipe realizes the connection in a mode of adding a conical sleeve pipe in order to ensure that the end opening intensity and the roundness of a big pipe with the thin wall can not be affected when external force impacts, ensures sealing reliability, and is suitable for connecting pipes which are longer than 50mm. Compared with flanges, high-pressure and quick connection has the advantages of small size, low cost and convenient installation, and the sealing of the high-pressure and quick connection can achieves the GMP sanitary standard of medical pipes. The connection in the present invention can be used for water supply and gas supply pipe systems.

Description

High pressure fast-assembling Stainless Steel Tube loose joint pipe fitting

(1) technical field: this patent connects in the book wall Stainless Steel Tube pipeline yarn system of pressure-bearing delivery fluid with what.Belong to pipe joint or pipe fitting (F16L) in the what engineering element.

(2) background technique: adopting the Stainless Steel Tube that subtracts the book wall thickness to make the pressure-bearing water pipe is to reduce the effective means that the stainless steel cost is met the need of market.What follow appearance is the optimal design problem of the book wall stainless steel pipe that matches with it.Proposed in the Chinese patent [a kind of book wall stainless joint] (patent No. 02221443.7) to preventing that the axial compression formula loose joint joint structure that book wall caliber adopts to distortion from (promptly compressing with the nut nut, two steel tube head flange, the centre is provided with the sealing gasket of the two O-ring seals of band), this structure solves the book pipe and is not subjected to radial pressure to produce distortion, the hydraulic pressure that bears also can satisfy the 10mpa requirement, but sealing configuration is complicated slightly, and to the heavy caliber book wall Guan Eryan of DN50, pipe end intensity is still weak.Therefore this patent proposes more perfect scheme: the following pipe fitting sealing configuration of DN50 is simplified, the sealing configuration of the above pipe fitting of DN50 is improved.Use book wall Stainless Steel Tube in industries such as petrochemical industry, often suffer from because of the port insufficient strength, circularity is subjected to outside destroy, and makes seal failure.This also is the weak link of book of book wall stainless steel pipeline.

Chinese patent ' a kind of book wall tubular union structure ' has proposed to tighten with the nut wire ring in (CN2280824Y), the structure of placing sealing gasket between vertical flange of stainless-steel thin-wall pipe and joint processing end face, but this structure, processing end face difficulty causes sealing unstable, weak effect.The lining that hypotenuse is arranged that Chinese patent [thin walled tube assembly parts] has proposed dress band omoplate between the oblique flange of two thin walled tube ports in (CN2251064Y) increases by two pipe connectivity robustness to support the book pipe, but the sealing configuration of this lining configuration is when being subjected to the axial force that steel pipe expands with heat and contract with cold, and damages easily and to cause sealing working life short.

(3) summary of the invention:

The high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting that the present invention proposes, solve above-mentioned book wall Stainless Steel Tube joint sealing and port intensity difference and complex structure and other problems exactly, its technological scheme is as follows: a kind of high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting, comprise the nut 2 of being with internal thread 2.1, the wire ring 3 of the band outside thread 3.1 that matches with it is characterized in that by the book wall Stainless Steel Tube la that connects, lb, be inserted in nut or/and the wire ring endoporus, and steel tube head is provided with vertical flange; At the vertical flange l of two steel pipes ₁A and l ₁Between b or an end be the vertical flange l of steel pipe ₁A, the other end are the vertical flange l of pipe fitting 5 ₅Between, establish the seal washer 4 that the plane of vertical flange with two matches.

A kind of high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting comprises the nut 2 of being with internal thread 2.1, the wire ring 3 of the band outside thread 3.1 that matches with it, it is characterized in that by the book wall Stainless Steel Tube la that connects, lb, be inserted in nut or/and the wire ring endoporus, and steel tube head is provided with vertical flange; At the vertical flange l of two steel pipes ₁A and l ₁Between b or an end be the vertical flange l of steel pipe ₁A, the other end are the vertical flange l of pipe fitting 5 ₅Between, establish the internal expanding stuffing box gland 7 or 8 that all steel is made, the left and right Taper Pipe 7.1 that it is cooperated with cover in the flange mouth by two ends or 8.1 is formed with the sealing seat 7.2 or 8.2 that is connected and fixed two Taper Pipes and lays the band double density sealing groove of double density seal 6.

A kind of high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting comprises the nut 2 of being with internal thread 2.1, the wire ring 3 of the band outside thread 3.1 that matches with it, it is characterized in that by the book wall Stainless Steel Tube la that connects, lb, be inserted in nut or/and the wire ring endoporus, and steel tube head is provided with vertical flange; At the vertical flange l of two steel pipes ₁A and l ₁Between b or an end be the vertical flange l of steel pipe ₁A, the other end are the vertical flange l of pipe fitting 5 ₅Between, establish by a seal ring 9.2 or 10.2 and the internal expansion type

stuffing box gland

9 or 10 formed of left and right sides Taper Pipe 9.1 or 10.1.

Above-mentioned seal washer 4 cross sections can adopt rectangle or O shape or cydariform or other shape, form rectangle or O shape or cydariform seal washer 4.1,4.2,4.3.Above-mentioned double density seal 6 shape of cross sections can adopt rectangle or O shape.Above-mentioned seal ring 9.2 or 10.2 shape of cross sections can adopt the spill of O shape or interior band eyelet.The sealing material of above-mentioned all Sealings all can select silicone rubber or nitrile rubber to make, and can add carbon fiber or metal or nonmetal backing member in the sealing material, and its shore hardness is between 65-75.Above-mentioned pipe fitting 5 is meant elbow 5.1 in the pipeline, threeway 5.2, straight joint, valve, water meter class etc.

Beneficial effect of the present invention: to first kind of pipe fitting: behind the vertical flange of (1) steel pipe, port is the crimping on two planes, and is because of designing precision, precisely controlled at special flanger upper overturning width, port circularity can be precisely controlled, and two planes can be crimped on the sealing gasket both sides very accurately.(2) the loose joint sealing is to connect both ends of the surface by nut and screw engagement with the inclined-plane propulsion mode, from both ends of the surface compression seal pad its thickness is narrowed down to about 2/3, to form good high pressure resistant sealing.(3) to reach port when compression seal seamless for this loose joint coupling, and the storage of noresidue liquid is stayed, and realizes that medium is not contaminated in the pipe, guaranteed the wholesomeness of pipeline.(4) simple in structure, easy for installation: only use a sealing gasket, cooperate the loose joint nut, screw just can be realized quick mounting.(5) good sealing effect is if sealing gasket hardness is selected suitably can bear up to the hydraulic pressure more than the 10Mpa.To second kind and the third pipe fitting: the internal expanding stuffing box gland that the present invention adopts guarantees when being subjected to external force collision that with this intensity and the circularity of big tube opening are still constant.This union that adds tapered cover can guarantee the reliability of thin-wall stainless steel tube opening and pipeline, the pipe fitting below sampling observation caliber DN100, and its bearing capacity all reaches more than the 10Mpa.This structure is compared with large-diameter flanged union, and small and light, price is low, and is easy for installation, belongs to a kind of high pressure ready-packaged joint.

(4) description of drawings:

Fig. 1 embodiment of the invention 1 structural drawing

Fig. 2 Fig. 1 discipline 4 shape of cross section figure

Fig. 3 embodiment of the invention 2 structural drawing

Fig. 4 embodiment of the invention 3 structural drawing

One of Fig. 5 embodiment of the invention 4 structural drawing

Two of Fig. 6 embodiment of the invention 4 structural drawing

(5) embodiment:

Embodiment 1: see Fig. 1, Fig. 2 is connected two book wall Stainless Steel Tube la and lb and penetrates respectively in nut 2 and wire ring 3 endoporus, and two steel tube heads are established vertical flange l ₁A, l ₁B establishes silicone rubber rectangular seal packing ring 4.1 with matching between two flange, (can add metalwork in the pad).Two stainless steel tube heads are with nut 2 that contains internal thread 2.1 and the wire ring that contains outside thread 3.1 3 that matches, and both tighten axial compression rectangular seal packing ring 4.1, to form high pressure sealing.This structure connects with the following fast-assembling of what bore DN50m, and specification is DN15, DN20, DN25, DN32, DN40, series products such as DN50.See Fig. 1, it is Stainless Steel Tube l that this structure is connected an end with what ₁A, the other end are class pipe fittings such as elbow 5.1 or threeway 5.2 or straight joint, valve 5.3, water meter 5.4, all are called pipe fitting 5, equally all adopt vertical flange l ₅Mode cooperate connection.

Embodiment 2: see Fig. 3, at the vertical flange l of connected two stainless steel pipe la, lb ₁A, l ₁Between the b, establish the isometrical internal expanding stuffing box gland 7 that all steel pipe is made, it is by two ends and flange mouth same inner diameter D ₁Left and right Taper Pipe 7.1 that cooperates and the sealing seat 7.2 that is connected and fixed two Taper Pipes and lays double density seal 6 are formed.The Taper Pipe maximum outside diameter is poor with the pipe diameter that matches, i.e. D ₁-D ₇Average is d≤5 thread.Double density seal 6 is put in the double density sealing groove 7.3 and matches.Double density seal 6 usefulness silicone rubber are made, and cross section is O shape or rectangle.All the other structures are identical with embodiment 1.This structure is with more than the what caliber DN50mm.Specification has DN65, DN80, and classes such as DN100 are multiple.

Embodiment 3: see Fig. 4, connected two stainless steel pipe calibers are inequality, and its endoporus latus rectum is respectively D1a, D1b, establish the reducing internal expanding stuffing box gland 8 that all steel is made between two flange, it is made up of left and right Taper Pipe 8.1a of reducing and the 8.1b that two ends cooperate with flange mouth endoporus.The sealing seat that connects left and right two Taper Pipes is 8.2.Taper Pipe maximum outside diameter and the poor of end pipe diameter, the i.e. (D of matching ₁A-D ₈A) or (D ₁B-D ₈B) be d≤5 thread.Double density seal 6a, 6b is put in the double density sealing groove 8.3, and matches.Nut 2a and 3a that the nut of this structure and wire ring do not wait for the two ends diameter that matches therewith, 3b, all the other structures are identical with embodiment 2.

Embodiment 4: see Fig. 5, and internal expansion type stuffing box gland 9, it is provided with a seal ring 9.2, and the cross section is O shape or rectangle or other pattern, and left and right two 9.1 of identical Taper Pipes have spill annular groove 9.3, tightly are with O V-shaped ring 9.2 in the spill annular groove.See Fig. 6, internal expansion type stuffing box gland 10 middle parts are with or are welded with eyelet 10.3, can be garden shape or square, are with a spill seal ring 10.2 outside it.All the other structures are identical with embodiment 2.

Claims

1. high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting, comprise the nut (2) of band internal thread (2.1), the wire ring (3) of the band outside thread (3.1) that matches with it is characterized in that connected book wall Stainless Steel Tube (1a), (1b) be inserted in nut or/and the wire ring endoporus, and steel tube head is provided with vertical flange; At the vertical flange (1 of two steel pipes ₁A) with (1 ₁B) between or an end be steel pipe flange (1 ₁A), the other end is the vertical flange (1 of pipe fitting (5) ₅) between, establish the seal washer (4) that matches with two vertical flange planes.

2. by the described pipe fitting of claim 1, it is characterized in that seal washer (4) cross section is rectangle or O shape or cydariform, sealing material selects silicone rubber or nitrile rubber to make.

3. high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting, comprise the nut (2) of band internal thread (2.1), the wire ring (3) of the band outside thread (3.1) that matches with it is characterized in that connected book wall Stainless Steel Tube (1a), (1b) be inserted in nut or/and the wire ring endoporus, and steel tube head is provided with vertical flange; At the vertical flange (1 of two steel pipes ₁A) with (1 ₁B) between or an end be steel pipe flange (1 ₁A), the other end is the vertical flange (1 of pipe fitting (5) ₅) between, if internal expansion type stuffing box gland (7) or (8) that all steel is made, the left and right Taper Pipe (7.1) that it is cooperated with cover in the flange mouth by two ends or (8.1) and be connected and fixed two Taper Pipes and lay double density seal (6) and be with sealing seat (7.2) or (8.2) of double density sealing groove to form.

4. by the described pipe fitting of claim 3, it is characterized in that double density seal (6) shape of cross section is rectangle or O shape; Sealing material selects silicone rubber or nitrile rubber to make.

5. high pressure fast-assembling Stainless Steel Tube loose joint pipe fitting, comprise the nut (2) of band internal thread (2.1), the wire ring (3) of the band outside thread (3.1) that matches with it is characterized in that connected book wall Stainless Steel Tube (1a) (1b), be inserted in nut or/and the wire ring endoporus, and steel tube head is provided with vertical flange; At the vertical flange (1 of two steel pipes ₁A) with (1 ₁B) between or an end be steel pipe flange (1 ₁A), the other end is the vertical flange (1 of pipe fitting (5) ₅) between, internal expansion type stuffing box gland (9) or (10) of adopting a seal ring (9.2) or (10.2) and left and right Taper Pipe (9.1) or (10.1) to form.

6. by the described pipe fitting of claim 5, it is characterized in that seal ring (9.2) or (10.2) shape of cross section are the spill of O shape or interior band eyelet; Sealing material selects silicone rubber or nitrile rubber to make.

7. by claim 3 or 5 described pipe fittings, maximum outside diameter that it is characterized in that left and right Taper Pipe (7.1) or (8.1) or (9.1) or (10.1) and difference d≤5 thread of matching and holding steel tube inner hole.

8. by claim 2 or 4 or 6 described pipe fittings, it is characterized in that adding in the sealing material carbon fiber or metal or nonmetal backing member, its shore hardness is between 65-75.

9. by claim 1 or 3 or 5 described pipe fittings, it is characterized in that pipe fitting (5) is meant elbow (5.1), threeway (5.2), straight joint, valve, the water meter class in the pipeline.