JPH0135106Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is applicable to pipes with a diameter of 20m and 20m, which are commonly used as oil supply and air supply channels for automobiles and other various machines, equipment, devices, etc. The present invention relates to an improvement in the connection structure of the pipe end of a metal pipe or a resin pipe having a relatively small diameter of approximately 1.5 m or less.

[Conventional technology]

Conventionally, as illustrated in FIG. 2, this type of pipe end connection structure has a seating surface 14 on the inner bottom wall of the connection screw hole 12 on the front surface of the shaft core, and the flow hole 1
3, the pipe is connected to the seat surface 14 of the connection hole 12 of the joint body.
When the opening consisting of the flare of the connecting end on the P' side or the bulging portion consisting of a collar, bridge, etc. is brought into contact with each other, the nut 15 is tightened into the connecting screw hole 12 from behind. The structure was such that the opening or the bulge was connected to the seat surface 14 by clamping it.

[Problem that the invention attempts to solve]

However, in the conventional pipe end connection structure, the flare, flange, bridge, etc. provided at the connection end on the pipe P′ side directly abuts the mating bearing surface 14, so the pipe Not only is a high degree of dimensional accuracy required for the installation length between both ends of P' in the bent state or the mutual installation angle at both ends, but also under conditions with poor dimensional accuracy. In connection with the forcible connection, the flare often occurs in combination with leakage or vibration.
Or cracks near the bottom of the neck such as the tsuba or bridge part.
This caused breakage. On the other hand, because of the fastening structure using the nut 15, the connection work is troublesome, and there are also problems such as loosening of the screw connection over a long period of time.

In order to extremely effectively solve the above-mentioned conventional problems, the present invention has a slit in the hole wall of the connection hole on the front side of the joint body, and a locking pawl at the peripheral end of the hole. The connection end on the side is configured as a free end, and the elastic sealing member on the side of the connection end is engaged with the bottom wall of the connection hole, and the protrusion wall is pressed by a cylindrical pressing body having a protrusion wall along the outer circumferential surface. By resiliently engaging the locking pawl and pressing the elastic seal member to tightly fit and connect the piping to the outer circumferential surface of the piping, the tolerance for the dimensional accuracy of the installation length on the piping side or the mutual installation angle can be adjusted. In addition to expanding the range, the adjustment function of the free end eliminates forced connections, eliminating concerns about leaks, cracks and breakage near the connection, and also eliminates the need for tools for tightening during connection work. The purpose of the present invention is to propose a connection structure for pipe ends that can be easily performed by simply pressing without having to do so, and that does not loosen over a long period of time.

[Means to solve the problem]

In the present invention, a stepped hole connected to the communication hole is provided in the inner bottom wall of the connecting hole on the front surface of the shaft core, and a plurality of slits are provided in the hole wall of the connecting hole, and furthermore, a plurality of slits are provided in the hole wall of the connecting hole. A joint body provided with an inward locking pawl along the circumferential edge of the hole allows the opening or bulge provided at the connection end on the piping side to be connected to the free end of the connection hole of the joint body. The protruding wall is formed by a cylindrical pressing body that is located inside the stepped hole and engages the annular elastic seal member on the piping side with the bottom wall portion, and further has an annular protruding wall from behind it along the outer peripheral surface. The gist of the present invention is a connection structure for the end of a small diameter pipe, in which the elastic seal member is pressed and elastically fitted tightly to the outer circumferential surface of the pipe by elastic engagement with the locking pawl. .

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. Fig. 1 is a partially cutaway vertical cross-sectional view of a connection structure for the end of a small diameter pipe according to the present invention, and 1 is a shaft core portion. A stepped hole 4 connected to the communication hole 3 is provided in the inner bottom wall of the connection hole 2 provided on the front surface of the connection hole 2, and a plurality of slits 6 are provided in the hole wall 5 of the connection hole 2, and The joint body is provided with an inward locking pawl 7 along the circumferential edge of the hole. Reference numeral 8 denotes an annular elastic sealing member made of a rubber material or a resin material, which is installed behind the free end of a flared opening provided at the connection end on the side of the pipe P to prevent it from coming off. It is positioned inside the stepped hole 4 and engaged with the bottom wall. Reference numeral 9 denotes a cylindrical pressing body having an annular protruding wall 10 along the outer peripheral surface, and presses the elastic sealing member from behind by elastic engagement of the protruding wall 10 with the retaining pawl 7. It is connected to the outer circumferential surface of the pipe P by being tightly pressed against it.

[Effect]

In this way, the present invention configures the joint body 1 with a slit 6 in the hole wall 5 of the connection hole 2 on the front side thereof, and further has a locking pawl 7 at the peripheral end of the hole, and the pipe P
The connecting end of the connecting end is configured as a free end, and the elastic sealing member 8 on the connecting end side is engaged with the bottom wall of the connecting hole 2, and the cylindrical pressing body 9 having the projecting wall 10 presses the connecting end of the projecting wall. The elastic sealing member 8 is pressed by elastic engagement with the retaining pawl 7, and is connected to the outer circumferential surface of the pipe P by elastic pressure, so that when the connection is made, the free end Due to the structure, it is possible to adjust the installation length between both ends of the pipe P or the mutual installation angle at both ends, and the connection can be made without difficulty in order to expand the allowable range of dimensional accuracy. and can be easily connected by pressing the cylindrical pressing body 8.

[Effect of idea]

As explained above, the connection structure of the small diameter pipe end of the present invention includes the structure of the free end at the connection end of the pipe P, and the slit 6 and the locking pawl 7 on the side of the joint body 1.
and the structure of the cylindrical pressing body 9 that presses the elastic sealing member 8 by engaging with the locking pawl, it is possible to expand the allowable range of dimensional accuracy due to the adjustment function. Therefore, it is possible to eliminate concerns about leakage caused by forced connections, and at the same time eliminate concerns about cracks and breakage due to the vibration absorption effect caused by the elastic sealing member's elastic sealing on the outer peripheral surface of the pipe P. It is an extremely useful pipe end connection that has many excellent effects, such as no tools required for connection, making it easy and quick to connect, and no slack at the connection. It is a structure.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway longitudinal sectional view of a connection structure for the end of a small diameter pipe showing an embodiment of the present invention, and FIG. 2 is a partially cutaway longitudinal sectional view of the same as the conventional example. DESCRIPTION OF SYMBOLS 1... Joint body, 2... Connection hole, 3... Distribution hole, 4... Stepped hole, 5... Hole wall, 6... Slit, 7... Latching claw, 8... Elastic seal member , 9
...Cylindrical pressing body, 10...Protruding wall.

Claims (1)

[Scope of utility model registration request] A stepped hole 4 connected to the communication hole 3 is provided through the inner bottom wall of the connection hole 2 on the front surface of the shaft core, and the connection hole 2
The joint body 1 is provided with a plurality of slits 6 in the hole wall 5 and further inwardly locking claws 7 along the circumferential edge of the hole on the front surface of the joint body 1.
located inside the stepped hole 4 with the opening or bulge provided at the connection end on the side of the pipe P as a free end, and engages the annular elastic seal member 8 on the side of the pipe with the bottom wall part; Furthermore, the elastic sealing member 8 is pressed by the cylindrical pressing body 9 having an annular protruding wall 10 along the outer circumferential surface from behind and elastically engaging the protruding wall with the locking pawl 7, thereby sealing the piping P. A connection structure for the end of a small diameter pipe, characterized in that the connection is configured by tightly fitting the outer peripheral surface of the pipe.