JPS6239051B2 - - Google Patents

Description

[Detailed Description of the Invention] Conventionally, gas screws, flanges and bolts have been used to reliably connect pipes to pipes, or pipes to the caps of various devices without leaking liquid or gas.・Various types of pipe connection methods are known, such as those using nuts and those using spigot joints.

However, all conventional pipe connection means have disadvantages such as the connection work is complicated, the structure of the pipe joint used is complicated and the manufacture is troublesome, and the protrusion of the connection part is large. It was hot.

An object of the present invention is to provide a pipe connection method that eliminates the above-mentioned drawbacks as much as possible, and an example of the connection method will be described below with reference to the accompanying drawings.

FIG. 1 shows an example of a pipe joint used in the method of the present invention.

Reference numeral 1 denotes a socket having a generally cylindrical shape, and is provided with a diameter-reduced stepped portion 1a in the center and cylindrical portions 1b, 1b on both left and right sides thereof.

The inner diameter of this cylindrical portion 1b is approximately equal to the outer diameter of the tubes 2 and 3 (see FIG. 2) to be connected to each other.

At the outer end of each cylindrical portion 1b, an annular protrusion 1c that bulges out in the centrifugal direction is provided.
An O-ring 4 whose outer diameter is slightly smaller than the outside diameter is fitted.

A tapered portion 1 is provided at the outer end of the annular protrusion 1c, 1c.
d are provided consecutively.

The inner diameter of the end of the tapered portion 1d on the annular protrusion 1c side is slightly larger than the outer diameter of the tubes 2 and 3, and the inner diameter of the outer end of the tapered portion 1d is approximately the same as the outer diameter of the tubes 2 and 3. Or it's slightly smaller.

Further, each tapered portion 1d has a plurality of slits 5 of appropriate lengths facing in the axial direction from the outer end thereof.
5, 5 are cut out at appropriate intervals in the circumferential direction.

The material of the socket 1 is preferably stainless steel, and the material of the O-ring 4 is preferably hard rubber. However, the material of the socket 1 may be a metal material such as aluminum or brass, or the material of the O-ring 4 may be , a soft synthetic resin material having elasticity, etc. may be used.

To connect the tubes 2 and 3, insert the tubes 2 and 3 into the openings at both ends of the socket 1, as shown by solid lines in FIG.
Connect each opposite end of the socket 1 beyond the O-ring 4.
It fits until it abuts against the diameter-reduced step portion 1a.

Thereafter, a relatively low viscosity liquid adhesive 7 is injected into a suitable position in one of the slits 5 using the adhesive dispenser 6. This adhesive 7 is preferably a quick-drying instant adhesive.

Then, the adhesive 7 expands evenly in the axial direction and the circumferential direction within the gap between each tube 2, 3 and the tapered portion 1d of the socket 1 due to its surface tension, and both tubes 2, 3 are As shown in FIG. 3, the connection is securely made through the adhesive 7 and the socket 1.

Thus, the gap between each pipe 2, 3 and socket 1 is closed by adhesive 7, and the O-ring is fitted between each pipe 2, 3 and socket 1 in a compressed state. Therefore, leakage of fluid from the opposing ends of the tubes 2 and 3 is reliably prevented.

As is clear from the above, according to the present invention, O
Simply fit the pipes to be connected into the above-mentioned socket-shaped pipe joint equipped with a ring, and inject adhesive into key points, making it extremely easy to connect pipes to pipes, or pipes to fittings, etc. , and can be connected reliably without leakage, and the protrusion of the connecting portion is small and lightweight, so it has great practical benefits.

Furthermore, in the present invention, the gap between the pipe to be connected and the tapered part of the pipe joint has a wedge-shaped cross section and gradually increases from zero, so when the adhesive is injected into this gap, Any part of it is
This corresponds to the optimum clearance that best demonstrates the performance of the adhesive.

Therefore, the tube and socket are strongly bonded in the optimum state at that portion, and there is no need to particularly increase the machining accuracy of the outer diameter of the tube and the inner diameter of the socket, which is advantageous. It is well known that the optimum adhesive clearance is particularly important in the case of liquid adhesives.

Furthermore, in the present invention, since the gap between the tapered part of the pipe joint on the outside of the O-ring and the pipe is closed with adhesive, the O-ring does not come into direct contact with the outside air, preventing oxidation of the O-ring. do,
Another advantage is that it can prevent the O-ring from deteriorating quickly.

In the above-mentioned embodiments, the pipe joint had a straight cylindrical shape, but it can be curved, or T-shaped, Y-shaped, cross-shaped, etc. when connecting three or more pipes to each other. The present invention is also applicable.

In addition, to ensure that the adhesive spreads well, an annular groove is formed at a suitable location on the inner surface of the tapered part of the pipe fitting, and in addition to the slit, the adhesive is applied to the gap between the tapered part of the pipe fitting and the pipe. An injection hole for injection into the tapered portion may be provided at a suitable location.

Furthermore, one end of the socket 1 in the above embodiment may be directly fixed to a device etc. to which the pipes are to be connected, or a socket shown in FIG. 1 may be attached to one end of the pipes to be connected to each other. A piece with the same structure as the right half (or left half) of 1 is integrally formed, the pipe to be connected is fitted into it, and adhesive is applied between the tapered part and the pipe. It can also be carried out by injecting.

[Brief explanation of the drawing]

FIG. 1 is a central longitudinal sectional front view showing an example of a pipe joint used in the method of the present invention, and FIG. FIG. 3 is a central longitudinal sectional front view showing a state in which adhesive is injected into the gap between the pipe joint and the tapered part of the pipe joint; FIG. be. 1...Socket, 1a...Reduced diameter step, 1b...
Cylindrical portion, 1c...annular protrusion, 1d...tapered portion,
2, 3...Tube, 4...O-ring, 5...Slit, 6...Adhesive dispenser, 7...Adhesive.

Claims (1)

[Scope of Claims] 1. At least one end of the cylindrical part is provided with a tapered part whose diameter gradually decreases toward the outer end, and an appropriate number of slits are cut in the edge of the tapered part, In addition, fit the end of the pipe to be connected into the pipe fitting fitted with an O-ring at the appropriate position on the inner surface of the cylindrical part until it passes the O-ring, and then taper the pipe and the pipe fitting. A pipe connection method characterized by injecting an adhesive into a wedge-shaped gap formed between the parts. 2. The method according to claim 1, characterized in that diameter-reducing step portions are formed at key points of the pipe joint, with which the end surfaces of the pipes to be connected should come into contact. 3. The method according to claim 1 or 2, wherein the pipe joint has a straight cylindrical shape. 4. The method according to claim 1 or 2, wherein the pipe joint has three or more ports.