JPH0552286A - Connection of pipe - Google Patents

Abstract

PURPOSE:To surely prevent the slip-off and breakage of a rubber ring even if the chamfering work for a pipe insertion port is omitted, by gradually spreading the diameter of the inner periphery of the rubber ring in a pipe receiving port by a tapered part which becomes thinner towards the top edge of an insert installed at the top edge part and inserting the pipe insertion port. CONSTITUTION:An insert A is inserted into a pipe receiving port 2, and the outer surface of the tapered part 11 which becomes thinner towards the top edge of the insert A is brought into contact or set close to the inner peripheral surface of a rubber ring 3. Then, a pipe insertion port 4 is inserted into the insert A, and the top edge 41 of the pipe insertion port 4 is brought into contact with the inner surface of the tapered part 11 which becomes thinner toward the top edge, and the insert A is pushed into the pipe receiving port 2, together with the insertion of the pipe insertion port 4. When the insertion of the pipe insertion port 4 proceeds, and it passes through the rubber ring 3, the insertion of the pipe insertion port 4 is suspended, and the connection work is completed. At this time, the pressing force in the pipe axis direction acting on the rubber ring 3 can be sufficiently reduced, because of the gentle gradient of the tapered part which becomes thinner towards the top edge, and the slip-off of the rubber ring can be prevented. Further, since the top edge of the pipe insertion port 4 can be made to an arbitrary shape, the chamfering of the outer peripheral part at the top edge of the pipe insertion port 4 can be omitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of connecting pipes, particularly synthetic resin pipes, which are used for connecting a synthetic resin pipe through a rubber ring by a receiving / inserting method.

[0002]

2. Description of the Related Art When connecting a pipe body, a rubber ring may be mounted in a receiving port formed in advance at a pipe end, and a pipe insertion port may be inserted into the receiving port.

In this pipe connecting portion, in order to give flexibility, the insertion opening can be tilted to a certain extent with the rubber ring as a fulcrum in the receiving opening. In the above-mentioned pipe connection, when the pipe insertion port is inserted into the pipe receiving port, the tip of the insertion port hits the rubber ring, and a pressing force in the pipe axis direction acts on the rubber ring. Therefore, in order to impart the above flexibility, the gap between the pipe receiving port and the pipe inserting port is considerably widened, and accordingly, the protruding height of the rubber ring from the inner surface of the pipe receiving port is also increased. Since there is a concern that the rubber ring may be detached or damaged by the pipe axial pressing force, conventionally, the tip outer peripheral portion of the pipe insertion opening is chamfered to ease the pipe axial pressing force and release the rubber ring. Preventing and preventing damage.

[0004]

However, the chamfering work of the pipe insertion port must be carried out after the continuous cutting of the continuously extruded pipe while maintaining the cooperation with the forming process of the pipe receiving port. It is not easy because it needs to be done at high speed.
Further, the chamfering of the pipe insertion port is usually performed by cutting, and the cutting surface is likely to be roughened due to the above high-speed processing, or the chamfered portion is likely to be damaged due to its thin wall during transportation of the pipe. The rubber ring is scratched due to a rough surface or a defective edge, and the rubber ring is likely to be detached or damaged.

In addition, a fixed length pipe is often cut and used as appropriate in order to adjust the length of the pipe line during construction. In this case, the cut pipe end must be chamfered at the construction site. However, the chamfering work at the construction site is not only a complicated work, but the chamfering amount also varies depending on the operator, etc., and there is a problem in reliability.

An object of the present invention is to remove a rubber ring even if the chamfering process of the pipe insertion port is omitted when the pipe is inserted into the pipe receiving port having a rubber ring mounted on the inner peripheral surface to connect the pipes. SUMMARY OF THE INVENTION It is an object of the present invention to provide a pipe connecting method capable of reliably preventing damage and easily inserting the pipe insertion port into the pipe receiving port.

[0007]

SUMMARY OF THE INVENTION The method of connecting pipes according to the present invention is a method of inserting a pipe insertion port into a pipe receiving port having a rubber ring mounted on the inner peripheral surface thereof, and an insert having a tapered taper portion. Insert the tube insertion port into the tube receiving port while expanding the inner diameter of the rubber ring with this insert, and insert the tube until the insert passes through the rubber ring. It is characterized in that the insertion port is inserted, an insert accommodating groove is provided at the back of the pipe receiving port, and the insert that can be reduced in diameter is pushed into the pipe receiving port in a reduced diameter state, Insert the above in the non-reduced state
It is also possible to use an insert which can be housed in the housing housing groove or which is engaged with the outer surface of the tube insertion port and the inner surface of the tube receiving port in the insertion direction of the tube.

[0008]

The taper portion of the insert gradually expands the inner circumference of the rubber ring inside the pipe receiving hole to insert the pipe insertion hole. Even if the contact is eliminated and the tip of the tube insertion port is not chamfered, it is possible to insert the tube insertion port into the tube receiving port with good removal of the rubber ring and damage.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) show a front view and a vertical sectional view of an example of an insert A used in the present invention, each having a taper taper portion 11 and a straight portion 12
The outer diameter of the pipe is slightly smaller than the inner diameter of the pipe receiving port, the inner diameter of the straight portion 12 is slightly larger than the outer diameter of the pipe receiving port, and is made of metal or a rigid synthetic resin.

2A to 2C are explanatory views showing an embodiment of the present invention, in which 2 is a pipe receiving port with a rubber ring mounting groove formed at one end of the pipe, and 3 is a rubber ring. A rubber ring mounted in the mounting groove, A is an insert, and 4 is a tube insertion port.

In order to connect the pipes according to the present invention, first, as shown in FIG. 2A, an insert A is inserted into the pipe receiving port 2 and the tapered taper portion 11 of the insert A is inserted. The outer surface of is brought into contact with or close to the inner peripheral surface of the rubber ring 3. Then, as shown in FIG. 2B, the tube insertion port 4 is inserted into the insert A, and the tip 41 of the tube insertion port 4 is brought into contact with the inner surface of the tapered taper portion 11 of the insert A. The tubes are brought into contact with each other, and the insert A is pushed into the tube receiving opening 2 as the tube inserting opening 4 is inserted. By pushing in the insert A, the inner circumference of the rubber ring 3 is expanded on the outer surface of the tapered taper portion 11 of the insert A. In this case, in addition to the radial pressure component force on the rubber ring 3. The axial force component of the pipe axis acts, but this axial force component of the pipe axis (P is the compression pressure of the rubber ring 3, θ is the taper of the tapered taper portion 11 of the insert A, and the rubber ring 3 and the inserter). −If the contact area with A is S, then the pressing force F in the pipe axis direction is F = PSsinθ
The taper taper portion 11 of insert A
Since it can be made sufficiently small by loosening the gradient θ, the separation of the rubber ring 3 from the rubber ring mounting groove can be well prevented.

When the insertion of the pipe insertion port 4 in FIG. 2B progresses and the insert A passes through the rubber ring 3 as shown in FIG. 2C, the insertion of the pipe insertion port 4 is completed. Stop (print a mark at a predetermined insertion position of the tube insertion port 4 and
The insertion of the pipe insertion port is stopped when the pipe reaches the inlet of the pipe receiving port 2), and the connection work of the pipe is completed.

In the above, the length of the insert A is set so that the insert A can be housed between the inner side of the pipe receiving port 2 and the rubber ring 3 when the insertion of the pipe inserting port 4 is completed. The length of the tapered taper portion 11 of the insert A is set to be larger than the width of the rubber ring 3. Further, the minimum outer diameter of the tapered taper portion 11 of the insert A is set to be smaller than the minimum inner diameter of the rubber ring 3 [(a) of FIG. 2] in the uncompressed state, and the tapered taper portion 1 is formed.
The gradient θ of 1 is preferably 10 ⁰ to 15 ⁰ .

Regarding the handling of the insert A, either the insert A is installed in the pipe receiving port 2 in advance, or the insert A is installed in the pipe receiving port 2 or the pipe inserting port 4 when the pipe is connected. May be. The insert A is provided with a bell mouth 13 so that the tube insertion port 4 can be easily received, as shown in (a) (front view) and (b) (side view) of FIG. It is preferable that the bell mouth 13 be cut so that the bell mouth 13 does not act as an excessive resistance when the insert A is pushed into the pipe socket 2.
Therefore, it is preferable that the diameter can be freely reduced.

As the insert, a C-shaped cross section having a crack 15 over the entire length is used as shown in (a) (front view) and (b) (side view) of FIG. It can be mounted in the pipe receiving port 2 in the state or in the pipe insertion port 4 in the expanded state. In the case of the former, as shown in FIG. 4C, an insert accommodating groove 21 is provided at the back of the pipe receiving port 2 and the insert A pushed into the pipe receiving port 2 is in the original non-reduced state. It can also be accommodated in the insert accommodation groove 21.

In the pipe connecting method of the present invention, the insert can also be used as a retainer. 5 (a) and 5 (b) are a front view and a sectional view of an example of the insert A which is also used as a retaining metal fitting [a sectional view taken along the line of FIG. As shown in FIG. 5C, the locking projections 15 are locked to the outer surface of the tube insertion port 4 in the pipe withdrawing direction, and the bell mouth end 131 is locked. It is used by being locked to the step surface 22 on the inner surface of the receiving port 2.

6A and 6B are respectively a front view and a sectional view of another example of the insert A which is also used as a retaining metal fitting [a cross-sectional view of FIG. 6A]. , Has an inward claw 161, ... and an outward claw 162, ... at the end of the tube insertion side, and as shown in FIG.
On the other hand, the inward claw 161 is locked to the outer surface of the tube insertion port 4, and the outward claw 162 is locked to the inner surface of the tube receiving port 2 for use.

The pipe connection method of the present invention is not limited to the case where the other end of the pipe, that is, the insertion port, is connected to the socket with a rubber ring mounting groove preformed at one end of the pipe via the rubber ring. It can also be used when connecting pipes by a pipe joint having a grooved socket for wheel mounting.

[0019]

The pipe connecting method of the present invention has the construction as described above, and the insert having the tapered taper portion is pushed into the pipe receiving port by the pipe insertion port, and the taper of the insert is tapered. -Because the rubber insert in the pipe receiving part is expanded in the pipe part while inserting the pipe insertion port, the pressing force in the pipe axial direction acting on the rubber ring is due to the gentle inclination of the taper taper part. It can be made small enough to prevent the rubber ring from coming off. Further, since the tip of the tube insertion port does not come into contact with the rubber ring and the shape of the tip of the tube insertion port can be arbitrarily set, chamfering of the outer peripheral portion of the tip of the tube insertion port can be omitted, and the extruded tubular body It is possible to simplify the manufacturing process of the pipe by forming the pipe body after the standard length cut only by forming the receiving port, or during transportation of the pipe, connect the pipe even if a defect occurs in the pipe insertion port. It can be performed without any trouble, and the work of chamfering the cut pipe end can be omitted at the construction site.

[Brief description of drawings]

FIG. 1A is a front view showing an example of an insert used in the present invention, and FIG. 1B is a longitudinal sectional view thereof.

FIG. 2 is an explanatory diagram showing a work procedure of an embodiment of the present invention.

3 (a) is a front view showing an example of an insert different from the above used in the present invention, and FIG. 3 (b) is a side view thereof.

4 (a) is a front view showing an example of an insert different from the above used in the present invention, FIG. 4 (b) is a side view, and FIG. 4 (c) is this. It is explanatory drawing which shows the use condition of an insert.

5 (a) is a front view showing an example of an insert different from the above used in the present invention, and FIG. 5 (b) is a sectional view taken along the line of (a) in FIG. FIG. 5C is an explanatory diagram showing the use state of this insert.

6 (a) is a front view showing an example of an insert different from the above used in the present invention, and FIG. 6 (b) is a cross-sectional view taken along the line of FIG. 6 (a). FIG. 6C is an explanatory diagram showing the use state of this insert.

[Explanation of symbols]

 A insert 11 tapered taper part 2 pipe receiving port 3 rubber ring 4 pipe insertion port 21 insert housing groove 131 locking protrusion 15 locking protrusion 161 locking protrusion 162 locking Salient

Claims (3)

[Claims] 1. A method of inserting a pipe insertion port into a pipe receiving port having a rubber ring attached to an inner peripheral surface thereof, wherein an insert having a tapered taper portion is pressed by a tip of the pipe inserting port. It is characterized by pushing it into the mouth, inserting the tube insertion port into the pipe receiving port while expanding the inner diameter of the rubber ring with this insert, and inserting the tube insertion port until the insert passes through the rubber ring. How to connect the pipe. 2. The insert receiving groove according to claim 1, wherein the insert receiving groove is provided at the back of the pipe receiving port, and the insert, which can be reduced in diameter, is pushed into the pipe receiving port in a reduced diameter state, and in the original non-reduced state. A method for connecting a pipe to be housed in the insert housing groove. 3. The method of connecting pipes according to claim 1, wherein an insert is used for the insert, which engages with the outer surface of the pipe insertion opening and the inner surface of the pipe receiving opening in the pipe withdrawing direction.