WO2012146069A1

WO2012146069A1 - Technical method for joining thin-walled metal pipe fitting with thin-walled metal pipe

Info

Publication number: WO2012146069A1
Application number: PCT/CN2012/000687
Authority: WO
Inventors: 庞浩辉
Original assignee: Pang Haohui
Priority date: 2011-04-25
Filing date: 2012-05-18
Publication date: 2012-11-01
Also published as: CN102758976A; CN102758976B

Abstract

A technical method for joining thin-walled metal pipes comprises a thin-walled metal pipe body (1), a thin-walled piper connector (2), a seal ring (3), a top barrel (4), a protrusion point (11) for wedge pressing at the end of the thin-walled metal pipe body, wherein the thin-walled piper connector (2) is provided with a spigot (21) embossed with both internal and external threads, and there is a conical step (22) at the bottom of the bell and spigot. When joining the same, the top barrel (4) is inserted into the pipe body (1), with the protrusion point (11) pressing on the end of the pipe body (1), the seal ring (3) is sleeved to the front of the protrusion point (11) of the pipe body (1), and then both of them are inserted into the spigot (21) of the piper connector (2), with the seal ring (3) of the pipe body (1) abutting tightly against the conical step (22) of the spigot (21) of the piper connector (2), and the top barrel (4) is screwed tightly by screwing the external thread of the top barrel (4) along the internal thread of the piper connector (2) so as to form a firm and sealed connection. The method reduces significantly the production costs of the piper connectors, is easy and fast to construct, and lowers significantly the labour intensity and construction difficulty.

Description

Technical method for connecting thin-walled metal pipe fittings with thin-walled metal pipes

Technical field:

The invention relates to the technical field of liquid and gas conveying pipeline connection, in particular to a method for sealing connection between a thin-walled metal pipe and a thin-walled metal pipe.

Background technique:

The traditional metal pipe and pipe joints are thick-walled, and the method of reaming the thread at the port of the pipe is required. In order to ream the thread, it is necessary to increase the wall thickness of the pipe, resulting in serious waste of metal materials and high production cost. Gradually replaced by thin-walled stainless steel pipes and fittings, such as the current popular compression connection method, there is no sealing ring in the thin-walled stainless steel pipe socket, after inserting the thin-walled stainless steel pipe into the pipe joint socket, with special tools Outside the pipe socket, force the pipe fittings and pipes to force the two to change from round to inside to achieve a sealing effect. However, since the clamping connection method is a one-time use, it cannot be disassembled and said to be "dead." When the "or" is fixed, the clamping and connecting method has high requirements on the quality and technical requirements of the construction personnel. When the clamping pressure is not enough, or the pipe is inserted into the socket of the pipe fitting, the pipe port burr is easy to cut the sealing ring in the pipe fitting, etc. Phenomenon, when the pipe and pipe fittings are leaked after the pressure is connected, the pipe must be sawn to replace the pipe fittings, which is time consuming and wastes the pipe fittings. In recent years, there has been a jointed pipe fitting which adopts a hinged tooth method. Since the pipe fitting is made by precision casting, the wall thickness is 4-6 times larger than the pipe wall thickness. The material cost and processing cost are so high that the pipe fittings of the hinged thread are very expensive and are greatly limited in promotion and application, which are caused by the failure to find a better joining technique.

Summary of the invention:

The object of the present invention is to overcome the disadvantages of the conventional and existing connection methods, and propose a thin-walled metal which is simple, quick, economical and practical, can be repeatedly disassembled (without sawing tubes), and has a firm sealing property. Pipe connection technology. The object of the present invention is achieved by the following technical solutions: a technical method for joining a thin-walled metal pipe and a thin-walled metal pipe, comprising a thin-walled pipe body, a thin-walled pipe joint, a sealing ring, and a top cylinder. The end of the thin-walled metal pipe body is clamped to form a bump, and the pipe joint is also made of a thin-walled metal pipe body. After the pipe joint port is expanded, the socket is rolled with an internal and external thread shape, and the bottom of the socket is sealed. The tapered step of the ring, when assembling and connecting, put the top tube into the tube body, clamp the bump at the end of the tube body, put the sealing ring into the front of the tube body end bump, and then insert them together into the tube joint socket Inside, the sealing ring of the pipe port is close to the tapered step at the bottom of the socket of the pipe joint, and the top cylinder is threaded along the internal thread of the socket of the pipe joint, clockwise into the socket, and then the top cylinder is tightened by the handle. When the tube body is pressed, the sealing ring in front of the bump is pressed, and at this time, the sealing ring forms a firm sealing connection with the pipe joint and the pipe body after being pressed.

Such a connection method has the obvious advantages that the metal pipe body does not need to be processed by the damaged hinge thread, and only the bump is clamped at the end of the pipe body, and the pipe joint does not need to be subjected to the damaging cutting process of the hinge thread, only After the end of the pipe joint is expanded, the internal and external threads are rolled, which can meet the purpose of firm sealing connection. This connection method greatly reduces the consumables of the pipe fittings, greatly reduces the processing cost, greatly reduces the production cycle and also makes the installation easier. Fast, easy to install and disassemble, and better sealing performance.

BRIEF DESCRIPTION OF THE DRAWINGS:

The drawings are schematic views of the joining technique of the present invention.

Specific implementation method:

Referring to the drawings, this embodiment is mainly composed of a thin-walled stainless steel pipe body 1, a thin-walled stainless steel pipe joint 2, a rubber sealing ring 3, and a top cylinder 4. In particular, the end of the tubular body 1 is clamped against the bump 11 , and the end of the thin-walled tubular joint 2 is expanded with a socket 21 which can be inserted into the tubular body 1 and the sealing ring 3 with internal and external threads. The bottom of the hole 21 is provided with a tapered step 22 which can be placed in the sealing ring 3, and the external thread 41 of the top cylinder 4 can be correspondingly fitted with the internal thread 21 of the pipe joint. When installing the connection, first insert the top cylinder 4 into the pipe body 1, clamp the bump 11 at the end of the pipe body 1, and then insert the sealing ring 3 into the front of the pipe body bump 11, and then insert them together Tube In the inner and outer threaded socket 21 of the joint 2, the sealing ring 3 at the end of the pipe body 1 abuts the pipe joint tapered step 22, and the external thread 41 of the top cylinder 4 is screwed into the pipe along the internal thread in the pipe joint receiving socket 21. In the joint 2, when the top cylinder 4 is tightened by the handle, the top cylinder 4 presses the bump 11 of the pipe body while pressing the front seal ring 3 of the bump 11 at this time, and at the time the pressure is 3⁄4f 3 after the pressure is applied to the pipe body 1, the pipe joint The tapered step 22 forms a method of secure sealing connection.

Of course, only a preferred embodiment is listed here, and the technical solutions can be changed by other equivalents or the like, and are not mentioned here, but they should fall within the protection scope of the patent.

Claims

1. Technical methods for joining thin-walled metal pipe fittings with thin-walled metal pipes, including thin-walled metal pipe bodies, pipe joints, sealing rings, top cylinders, thin-walled metal pipe ends crimped up, and pipe joints are thin-walled The metal pipe body is made of a pipe joint port, and after being expanded, a socket having an inner and outer thread shape is rolled, and a bottom of the socket is provided with a sealing step of a sealing ring. When the connection is made, the top cylinder is sleeved into the pipe body, in the pipe. The end of the body is clamped to the bump, the sealing ring is inserted into the front of the tube body, and then they are inserted into the socket of the pipe joint. The sealing ring of the pipe port is close to the tapered step at the bottom of the pipe socket. Follow the internal thread of the socket of the pipe joint, screw it clockwise into the socket, and then tighten the top cylinder with the handle. The top cylinder pushes the pipe body to press the sealing ring in front of the bump. When the sealing ring is under pressure, The pipe body and the pipe joint form a firm sealing connection technique.

2. The bump of the end of the pipe body according to claim 1 may be one or two points, and the more the size of the pipe body diameter is distributed, the more the bumps are distributed, and the bumps and bumps around the pipe diameter may not be Isometric distribution, but the bumps cannot be clamped on the weld line.

3. The distance between the bump of the pipe body and the pipe end is less than or equal to 60 mm according to the claim, and the distance between the bump of the same pipe body and the pipe mouth is equal; the height of the bump body cannot be 6 mm higher than the outer diameter of the pipe body.

4. The connector of claim 1 which is formed from a thin-walled metal tube having a wall thickness equal to or greater than the wall thickness of the tube but not greater than 2.5 times the wall thickness of the tube.