WO2009012622A1

WO2009012622A1 - A metal pipe connecting structure

Info

Publication number: WO2009012622A1
Application number: PCT/CN2007/002747
Authority: WO
Inventors: Fan Ouyang; Weiguang Luo; Ning Huang; Libin Huang
Original assignee: Fan Ouyang; Weiguang Luo; Ning Huang; Libin Huang
Priority date: 2007-07-23
Filing date: 2007-09-18
Publication date: 2009-01-29
Also published as: CN201066004Y

Abstract

A metal pipe connecting structure consists of a pipe body (1) and a pipe joint (2). One end of the pipe body (1) is fitted into the pipe joint (2). An external bead (3) is formed near the end of the pipe body (1) and has a regular or an irregular curved face. A seal ring (4) is mounted on the side of the external bead (3) which is close to the opening of the pipe body (1), and a coupling member (6, 8) on the pipe body (1) is positioned on the other side of the external bead (3). A shoulder hole (5) is positioned in the inner wall of the pipe joint (2) which is corresponded to the seal ring (4). The end face of the pipe joint (2) is connectedto the junction member (6, 8) on the pipe body (1).

Description

Metal pipe connection structure

Field of the Invention This invention relates to the field of fluid and gas delivery tube connections and, more particularly, to a sealed tubular metal fitting.

Background technique

The traditional metal pipe connection methods are mainly compression type, welding type and groove type. The disadvantages of the press type and the welded type are that the installation requirements are relatively high, and it is difficult to disassemble after installation; the groove type is disadvantageous in that the tensile force is low, the looseness is liable to occur, and when the pipe is produced The wall thickness of the pipe is reserved as the remaining amount of the groove, so that the thickness of the pipe is much higher than the size set by the actual fluid pressure. It is because of the unreasonable connection structure that the metal material of the pipe is wasted a lot. The cost is too high; however, when the pipe weld is subjected to the joint processing, the pipe crevice damage is likely to occur, thereby affecting the sealing performance.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a metal pipe joint structure which is not only firmly connected, has good sealing performance, and can avoid damage to pipe quilting, in order to solve the deficiencies of the prior art.

The present invention achieves the above object by adopting the following technical solution: a metal pipe connecting structure, including a pipe body and a pipe joint, the pipe joint is sleeved at an end of the pipe body, and the end portion of the pipe body is convex. Forming a convex arc, the convex arc is provided with a sealing ring on the pipe near the pipe mouth section, and the connecting pipe is arranged on the other side of the convex arc, and the inner wall of the pipe joint is provided with a stepped hole corresponding to the sealing ring on the pipe, the pipe The end face of the joint is correspondingly connected to the connecting member on the pipe body.

As a further description of the above solution, the connecting member on the pipe body is a nut, and the end surface of the pipe joint is provided with an external thread matched with the nut, and a retaining ring is arranged between the sealing ring and the convex arc. The seal ring, the convex arc and the retaining ring are all enclosed inside the nut.

The end of the sealing ring is provided with a slope, the slope is inclined toward the tube body, and the oblique angle is

15-90°.

The convex arc is a convex curved surface band which is embossed at the pipe for one or more segments, and the convex curved surface band is a curved surface band of a regular shape, and the curved surface band has an angle equal to the surface of the pipe.

The convex curved surface strip is an irregularly shaped curved surface strip.

The angle between the convex curved surface of the ridge at the pipe and the surface of the pipe is 15 to 90°.

The connecting member on the pipe body is a flange, and the end surface of the flange is provided with a plurality of screw holes, and the screw holes are provided with connecting bolts, and the end faces of the pipe joints are provided with screw holes corresponding to the flange connecting bolts.

The sealing ring is embedded in the stepped hole, and the convex arc at the end of the pipe body is disposed outside the stepped hole of the pipe joint, and the convex arc is clamped between the flange and the sealing ring.

The sealing ring is a silicone ring.

The beneficial effects that the present invention can achieve by using the above technical solution are: the invention adopts the convex arc of the end of the pipe body, and then cooperates with the sealing ring and the flange connection or other pipe connection, the pipe body itself does not need to be subjected to the damaging cutting process. Simply expand the pressure to form a convex ring to seal the connection with the pipe joint. The wall thickness of the pipe body can be set directly according to the need, without the need to reserve the machining allowance, the metal consumption of the pipe body is greatly reduced, and the production cost is greatly reduced. Moreover, the connection position of the pipe end is high in compressive tensile strength, the connection is simple, firm, and the sealing property is good.

DRAWINGS

1 is a partial cross-sectional structural view of an embodiment of the present invention;

2 is a partial cross-sectional structural view showing another embodiment of the present invention;

3 is a schematic partial cross-sectional structural view of the end portion of the tubular body of the invention;

4 is a partial cross-sectional structural view showing another embodiment of a convex arc at the end of the tubular body of the present invention. DESCRIPTION OF REFERENCE NUMERALS: 1. Pipe body 2, pipe joint 3, convex arc 4, sealing ring 5, stepped hole 6, nut 7, external thread 8, flange 9, screw hole 10, connecting bolt 11, 'retaining ring

detailed description

Example 1

As shown in FIG. 1 and FIG. 3, the metal pipe climbing structure of the present invention comprises a pipe body 1, a pipe joint 2, and a pipe joint 2 is sleeved at an end of the pipe body 1, and the end of the pipe body 1 is convexly raised. Forming a convex arc 3, the convex arc 3 is a convex curved surface band which is embossed at the pipe for one or more segments, and the convex curved surface band is a curved surface band of a regular shape, the curved band having an angle α equal to the surface of the pipe, the convexity The angle between the curved surface and the surface of the pipe is 15~90°. The sealing ring 4 is provided on the pipe near the pipe mouth of the convex arc 3. The sealing ring 4 is a silicone ring, and the other side of the convex arc 3 is provided with a sealing ring. The connecting member 4, the inner wall of the pipe joint 2 is provided with a stepped hole 5 corresponding to the convex arc 3 of the pipe body, and the end surface of the pipe joint 2 is correspondingly connected with the connecting member 4 on the pipe body 1, in this embodiment, on the pipe body The connecting member 4 is a nut 6. The end surface of the pipe joint 2 is provided with an external thread 7 matched with the nut 6. A sealing ring 11 is arranged between the sealing ring 4 at the end of the pipe body and the convex arc 3, and the sealing is sealed. The ring 4, the convex arc 3 and the retaining ring 6 are all enclosed inside the nut, and the end of the sealing ring is provided with a slope, the inclined surface Direction of the tubular body inclined angle of 15~90 °.

Example 1

As shown in FIG. 2 and FIG. 4, the difference between the embodiment and the above embodiment is that the convex curved surface strip is an irregularly shaped curved strip, and the connecting member 4 on the tubular body 1 is a flange 8. The end face of the flange 8 is provided with a plurality of screw holes 9, and the screw holes 9 are provided with a connecting bolt 10, and the end surface of the pipe joint 2 is provided with a screw hole 9 corresponding to the bolt connecting the flange 8', and the sealing ring is embedded in the pipe In the stepped hole of the joint 2, the convex arc of the end of the pipe body is disposed outside the stepped hole of the pipe joint, and the convex arc is clamped between the flange and the seal ring. The invention is not limited to the above embodiment, and the outer convex strip length may be greater than half of the circumference of the pipe, or may be configured as a plurality of distributed bumps on the circumference of the pipe, and any person skilled in the art may make various modifications and Variations, without departing from the spirit of the invention, are within the scope of the invention as claimed.

Claims

Rights request

1 . A metal pipe connection structure, comprising a pipe body and a pipe joint, wherein the pipe joint is sleeved at an end of the pipe body, wherein: the end of the pipe body is convexly formed to form a convex arc, and the convex arc is close to the pipe. A sealing ring is arranged on the mouth pipe, and a connecting member is arranged on the other side of the convex arc. The inner wall of the pipe joint has a stepped hole corresponding to the sealing ring on the pipe, and the end face of the pipe joint corresponds to the connecting member on the pipe body. Docked.

2. A metal pipe joint structure according to claim 1, wherein: the connecting member on the pipe body is a nut, and the end face of the pipe joint is provided with an outer thread matched with the nut.

3. The metal pipe connection structure according to claim 2, wherein: a retaining ring is disposed between the sealing ring and the convex arc, and the sealing ring, the convex arc and the retaining ring are both encapsulated inside the nut.

4. A metal pipe connection structure according to claim 3, wherein: the end of the sealing ring is provided with a sloped surface which is inclined toward the pipe body and has an oblique angle of 15 to 90 degrees.

5 . The metal pipe connection structure according to claim 1 , wherein: the convex arc is a convex curved surface band that is embossed at the pipe for one or more segments, and the convex curved surface band is a regular curved surface band. , the curved strip has the same angle as the surface of the pipe.

6. A metal pipe connection structure according to claim 5, wherein: said convex curved surface band is an irregularly shaped curved surface band.

7. The metal pipe connection structure according to claim 5, wherein: the convex curved surface of the ridge at the pipe is at an angle of 15 to 90° with the pipe surface.

8. The metal pipe connection structure according to claim 1, wherein: the connecting member on the pipe body is a flange, and the end surface of the flange is provided with a plurality of screw holes, and the screw holes are provided with a connection. Bolts, the end faces of the pipe joints have screw holes corresponding to the flange connection bolts.

9. The metal pipe connection structure according to claim 7, wherein: the sealing ring is embedded in the stepped hole, and the convex arc of the end of the pipe body is disposed outside the stepped hole of the pipe joint, and the convex arc Clamped between the flange and the seal.

10. A metal pipe joint structure according to claim 1, wherein: said seal ring is a silicone ring.