Directly-pushing connecting pipe joint

Abstract

The invention relates to a directly-pushing connecting pipe joint comprising a joint body (3) with a through hole (2) for the insertion of a connecting pipe (1) to be connected. A sealing rubber ring (5) forming a water-tight seal with the body of the connecting pipe (1) to be connected is mounted in the through hole (2), stepped holes respectively having a large interior and a small exterior are respectively arranged at both ends of the through hole (2); the outer small hole is a sealing section (6) and has an inside diameter adaptive to the outer diameter of the connecting pipe (1) to be connected; the inner large hole is a horn hole (7) with a large mouth facing inward; a gap is formed between the inner wall of the horn hole (7) and the connecting pipe (1) to be connected; the sealing rubber ring (5) is mounted at the innermost end of the gap which is also provided with an elastic open clasp ring (8); and a circular clasp ring groove (9) corresponding to the elastic open clasp ring (8) is arranged outside the connecting pipe (1) to be connected. The groove in the joint body (2) of the connecting pipe (1) is directly arranged on the inner end wall of the horn hole (7) so that the joint body avoids generating great curvature change in a very short time and can be made by once profiling a cold expanding pipe to save raw materials and decrease the cost.

Description

Technical field [0001] The invention relates to a pipe connector, in particular to a direct push connection pipe joint. Background technique [0002] The pipe connection is generally through a pipe joint, and the connected pipe and the joint are generally connected by a thread, and there are also connection structures that use an internal tooth split snap ring. There is also a direct-push connection structure that uses a combination of an elastic opening snap ring and a conical surface, and the connected pipe can be directly pushed into the joint body for connection, but is limited by the conical surface and the elastic opening snap ring and cannot be pulled out. [0003] A conventional pipe joint includes a joint body with a through hole for a connected pipe to be inserted into, a groove is opened in the through hole, and a sealing rubber ring that forms a water seal with the pipe body to be connected is provided at both ends of the through hole. For the horn hole with a large m...

AI Technical Summary

Problems solved by technology

[0005] First of all, since the groove for installing the sealing rubber ring is opened on the wall of the through hole of the joint body, there is a gap between the innermost end of the horn hole, see figure 1 In this way, many problems are caused in the manufacture of the joint body: if lathes are used to make grooves and horn holes on the joint body, the wall thickness of the joint body will be greatly increased, and the cost of materials and processing costs will increase. It will increase by about 4 times, and the pipe joints need to be mass-produced

[0006] Second, if the joint body is made by the profiling cold expansion tube method, since the distance between the groove of the sealing rubber ring and the horn hole is generally very small (it is too large to waste material), it is necessary to make the joint body in a very short length. It is very difficult for the joint body to produce such a large curvature change, and the cold expansion tube can only be molded twice, which also increases the processing cost

[0007] In addition, the width of the groove of the sealing rubber ring has higher requirements, because if the groove width is wider than the sealing rubber ring, the sealing rubber ring will be easily taken out when the connecting pipe is inserted, and if the groove width is narrower than the sealing rubber ring The deformation of the sealing ring is limited, and the life of the sealing ring is easily shortened, and the life of the joint is determined by the life of the sealing ring.

[0008] In addition, the big end of the horn hole on the joint body must be closed at the end. After closing, it must be excessively connected with the through hole that is adapted to the outer diameter of the connected pipe. No matter what method is used to form it, it is impossible to form a right angle, especially The pipe expansion method must have an excessive arc. Sometimes the radius of the excessive arc is not small. When the radius of the excessive arc is greater than the middle diameter of the most commonly used circular elastic snap ring, it will happen that the connected pipe is inserted At the same time, the elastic opening snap ring is pushed into the excessive arc position of the big end of the horn hole and cannot be expanded (see figure 2 ), or even deform the top of the elastic opening snap ring, and the connecting pipe cannot be inserted into the connection and cannot be connected

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