JPH0510490A - Tube joint and tube with - Google Patents

Abstract

PURPOSE:To ensure sealing ability to some degree even if the adhering interface is separated by providing a circumferential groove on the inner peripheral surface of a pipe socket to be bonded by an adhesive of a connected pipe inset port, storing a slip-off preventing ring in the enlarged diameter state therein, and releasing the diameter enlargement from the outside of the socket. CONSTITUTION:An adhesive 6 is applied to the inner surface 21 of the pipe socket 2 of a tube joint A and the outer surface of a pipe inset port B, and the pipe inset port B is inserted in the pipe socket 2. A slip-off preventing ring 4 is stored in the circumferential groove 3 of the inner surface of the pipe socket, and the inner surface of the pipe socket is a taper surface and swollen by the adhesive 6 so as to facilitate insertion. A pin 5 is pulled out before the adhesive 6 is dried and solidified, the slip-off preventing ring 4 enlarged in its diameter is reduced in its diameter by elasticity, and the inner periphery of the ring 4 is locked to the outer periphery of the pipe inset port B. Thus, the connecting work for the plastic pipes is completed. Even if the adhesive fails to function in the connecting portion, the fixing between the pipe socket 2 and the pipe inset port B can be held by the slip-off preventing ring 4 so that the sealing ability can be ensured to some degree by elastic contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint used for adhesive connection of a plastic pipe such as a vinyl chloride pipe and a pipe with a joint integrally having a joint for adhesive connection.

[0002]

2. Description of the Related Art When joining a plastic pipe, particularly a vinyl chloride pipe, the inner surface of the taper of the pipe receiving port (usually 1/30 to
1/45 taper) and the outer surface of the pipe insertion port are each coated with an adhesive agent, and the pipe insertion port is inserted into this pipe receiving port, so-called T
The S method may be used.

This construction method is widely used in construction piping sites because it requires no skill and can be easily constructed.
In the TS method, since the inside of the pipe receiving taper of the pipe joint and the outside of the pipe inserting port are swollen with the adhesive, the pipe inserting port is inserted into the receiving port during that time. Taper
Due to the effect and the lubricating effect of the swelling layer, even if the inner diameter of the inner part of the pipe receiving port is slightly smaller than the outer diameter of the pipe inserting port, it can be inserted with a comparatively small force, which is one of the advantages of the TS method. .

FIG. 9 is a partial vertical cross-sectional view of a pipe connecting portion using a TS joint. Normally, in the depth C'of the pipe receiving port 2 ', the pipe receiving port 2'side is widened and the pipe inserting port B is formed. The sides are squeezed and there is elastic contact between them. 6'denotes an adhesive.

[0005]

However, in the pipe connecting portion using the TS method, adhesion failure, for example,
If there is uneven coating of adhesive, etc., the pipe insertion often escapes from the pipe receiving port of the pipe joint and the water inside the pipe leaks all at once, and in this case, a water leakage accident is sudden, There was no time to repair it, and the interior of the building was inundated, resulting in excessive damage.

[0006] In the conventional pipe connection portion using the TS method, the seal resistance and pull-out strength are entirely dependent on the adhesive. However, in reality, the elastic contact between the pipe receiving port and the pipe inserting port also contributes to the seal to some extent due to the familiarity and adhesion due to elasticity, and the function of the adhesive is completely lost. Even if it is done, if it is possible to maintain its elastic contact, it is considered possible to maintain a certain degree of sealability. However, the conventional TS type joint does not have such a holding function.

The object of the present invention is to maintain a certain degree of sealability in a pipe connecting portion using an adhesive by maintaining good elastic contact between the pipe receiving port and the pipe inserting port even if the adhesive function is lost. It is to provide a pipe joint and a pipe with a joint that can be guaranteed and can satisfactorily eliminate sudden water leakage.

[0008]

In the pipe joint of the present invention, a circumferential groove is provided on an inner peripheral surface of a pipe receiving port to which an insertion port of a pipe to be connected is adhered by an adhesive, and the pipe is pulled out in the circumferential groove. The retaining ring is accommodated in a state where the diameter is forcibly expanded, and further, the forced diameter expansion can be released from outside the receiving port.

In the pipe with a joint of the present invention, a circumferential groove is provided on the inner peripheral surface of the pipe receiving port at the end of the pipe to which the insertion port of the pipe to be connected is adhered with an adhesive, and the pipe is prevented from coming off in the circumferential groove. The ring is accommodated in a state where the diameter is forcibly expanded, and further, the forced diameter expansion can be released from outside the receiving port.

[0010]

[Function] Even if the adhesive interface between the pipe receiving port and the pipe inserting port is completely peeled off, the retaining ring can keep the pipe inserting port fixed to the inside of the pipe receiving port and prevent the pipe receiving port from being inserted. Since the elastic contact with the mouth can be maintained, a certain degree of sealability can be guaranteed. Also, the pipe insertion port can be adhesively connected to the pipe receiving port while the retaining ring is completely accommodated in the circumferential groove of the pipe receiving port without protruding from the receiving port inner surface, so that the adhesive connection is satisfied. You can do it.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 (a) is a side view showing a part of the embodiment of the pipe joint of the present invention in section, and FIG. 1 (b) is a sectional view taken along the line of FIG. 1 (a) of the same embodiment. .

In FIGS. 1 (a) and 1 (b), reference numeral 1 is a plastic (for example, vinyl chloride) pipe joint body having a pipe receiving port 2. The inner surface of the pipe receiving port 2 is a taper surface of 1/30 to 1/45. Reference numeral 3 is a circumferential groove provided on the inner surface 21 of the pipe receiving port, and 31 is a pin insertion hole opened in the circumferential groove 3. Reference numeral 4 denotes a C-shaped cracking ring for preventing slipping out, which is molded from metal or hard plastic and has an inner diameter smaller than the outer diameter of a pipe insertion port B described later.

The inner periphery of the retaining ring 4 has a sharp rib 41 as shown in FIG. 2A, a plurality of protrusions 42 as shown in FIG. Concavo-convex teeth 43 (which may be ring-shaped or spiral-shaped) as shown in (c) are provided. The C-shaped crack ring 4 is fitted into the circumferential groove 3, the pin 5 is inserted into the pin insertion hole 31, and the tip end of the pin 5 is fitted into the crack of the C-shaped crack ring 4 and the C-shaped crack ring 4 is inserted. The mold cracking ring 5 is expanded in diameter, and the expanded cracking ring 4 is housed in the circumferential groove 3 without protruding to the inner surface of the receiving port. The expanded state of the C-shaped cracking ring 4 can be released with one touch by pulling out the pin 5.

3 (a) and 3 (b) show the procedure for joining plastic pipes using the pipe joint of the present invention. In (a) and (b) of FIG. 3, A indicates the pipe joint of the present invention, and B indicates the insertion port of the pipe to be connected.

To join a plastic pipe using the pipe joint of the present invention, first, the inner surface 21 of the pipe receiving port 2 of the pipe joint A is to be joined.
Then, the adhesive 6 is applied to the outer surface of the pipe insertion port B, and the pipe insertion port B is inserted into the pipe receiving port 2 as shown in FIG.

In this case, since the retaining ring 4 is housed in the circumferential groove 3 of the inner surface 21 of the pipe receiving port, there is no hindrance to the insertion of the pipe insertion port B, and the inner surface of the pipe receiving port is not damaged. Since the inner surface of the tube receiving opening 2 and the outer surface of the tube insertion opening B are swollen with the adhesive, they can be easily inserted. By this insertion, the adhesive 6 is provided between the pipe receiving port 2 and the pipe inserting port B.
And the tip of the tube insertion port B is bonded by the tube receiving port 2
Is elastically pressed to the inner part of the (indicated by C in FIG. 3). At the same time, the gap between the pipe receiving port 2 and the pipe insertion port B is filled with the adhesive 6, and the gap in the circumferential groove 3 is also filled with the adhesive 6.

After the insertion of the pipe insertion port B into the pipe receiving port 2 and before the adhesive 6 is dried and solidified, as shown in FIG.
The pin (5 in (a) of FIG. 3) is pulled out, and the retaining ring 4 in the expanded state is reduced in diameter by its elasticity, and the inner periphery of the ring 4 is locked to the outer periphery of the pipe insertion port B. At this point, the plastic pipe connection work was completed.

In the pipe joint of the present invention, even though the retaining ring 4 is built in the pipe receiving port 2, the retaining ring 4 does not protrude into the inner surface of the pipe receiving port, but inside the circumferential groove 3. When the tube insertion port B is inserted into the tube receiving port 2, the adhesive on the outer surface of the tube insertion port is scraped off by the retaining ring 4 or the retaining ring 4 is inserted into the tube receiving port. Resistance can be avoided and the pin 5 can be removed with one touch after inserting the tube insertion port, so that the plastic tube can be connected as easily as the conventional TS method.

Also in the connecting portion of the plastic pipe using the pipe joint of the present invention, as in the case of using the conventional TS method, the pipe insertion port and the pipe receiving port are adhered with an adhesive and at the back of the pipe receiving port. The tube receiving port and the tube inserting port are elastically contacted with each other. However, in the connection portion of the plastic pipe using the pipe joint of the present invention, even if the adhesive cannot perform its function, the retaining ring 4 prevents the pipe insertion port B from being fixed to the pipe receiving port 2. Since it can be held and the elastic contact C between the pipe receiving port 2 and the pipe insertion port B at the inner side of the pipe receiving port can be maintained, a certain degree of sealability due to this elastic contact can be guaranteed. Therefore, it is possible to avoid a sudden leak of water at the pipe connecting portion using the conventional TS method, and to keep the leak to a gentle level.

In the pipe joint of the present invention, the retaining ring and the pin are usually handled in a state where they are mounted in advance in the pipe receiving port. In this case, the retaining ring is fitted in the inner peripheral groove of the inner surface of the pipe receiving port, and the pin is held by the elastic reaction force of the retaining ring, so that the mounting state is stable, and in particular, as shown in FIG.
As shown in, if the head portion 51 of the pin 5 is formed in a thin dish shape along the outer surface of the joint, the collision between the pin head portion 51 and another object can be reduced, which is advantageous (in this case, the removal of the pin 5 is This can be done by bending the plate-shaped head 51 and picking it, or by picking it with pliers).

In the above description, if the cross-sectional shape of the pin 5 is elongated as shown in (a) (front view) and (b) (bottom view) of FIG. 5, the pin 5 is inserted into the pin insertion hole 31. Insert and leave the retaining C-shaped crack ring 4 in the expanded state,
90 ⁰ Can fitting the C-shaped crack ring with one touch by rotating the position on the shorter diameter than the diameter of the pin 5 by simply rotating, it is advantageous. The cross-sectional shape of the retaining ring 4 can be any suitable shape such as a quadrangle or a circle.

If the attachment position of the retaining ring 4 is near the inlet of the pipe receiving port 2, the adhesive 6 protruding toward the inlet side of the pipe receiving port as the pipe insertion port B is inserted is accommodated in the retaining ring. This is advantageous because the groove 3 can be sufficiently wrapped around and the adhesive area between the inner surface of the pipe receiving port and the adhesive can be increased accordingly.

The depth of the circumferential groove 3 is such that when the pipe insertion port B is inserted into the pipe receiving port 2, the retaining ring 4 expanded by the pin 5 is completely accommodated so that the pipe insertion port B can be inserted. In order to eliminate any hindrance, it is made slightly deeper than the diameter or thickness of the cross section of the retaining ring 4.

The pipe joint of the present invention can be applied to any plastic pipe joint having a pipe receiving port regardless of the type of the joint, for example, sockets, elbows, teeth, reducers and the like.

In the pipe joint of the present invention, only one end side may be configured as described above, and the other end side may be a normal TS type, screw type or packing tightening type. It is also possible to fix one end of the pipe joint of the present invention to one end or both ends of the plastic pipe in the factory, and connect the other end of the pipe joint and the connected pipe in the field. In this case, the pipe in the factory As shown in FIG. 6, the TS method under the severe working conditions is used for the fixation between the pipe joint and one end (in FIG. 6, E is the pipe joint of the present invention, 10 is the plastic pipe, and 6 is the adhesive). Agents are shown respectively), heat fusion method and the like can be used.

FIG. 7A is a partial sectional view showing an embodiment of the pipe with a joint of the present invention, and FIG. 7B is a view showing the same embodiment.
It is a cross-sectional view taken along the line (a). In (a) and (b) of FIG. 7, 10 is a tubular body portion, and 2 is a pipe socket formed in the pipe end portion 1. Reference numeral 3 is a circumferential groove provided on the inner surface 21 of the pipe receiving port, and 31 is a pin insertion hole opened in the circumferential groove 3.
Reference numeral 4 denotes a C-shaped cracking ring for preventing slipping out, and 5 denotes a pin. The C-shaped cracking ring 4 for preventing slipping out is fitted into the circumferential groove 3, the pin 5 is inserted into the pin insertion hole 31, and the tip of this pin 5 is inserted. Part C
The C-shaped cracking ring 5 is fitted into the crack of the mold-breaking ring 4 to expand its diameter, and the expanded cracking ring 4 is housed in the circumferential groove 3 without protruding to the inner surface of the receiving port. By pulling out the pin 5, the expanded state of the C-shaped cracking ring 4 can be released with one touch.

The structures of the C-shaped crack ring 4, the pin insertion hole 31, the pin 5 and the like in the jointed pipe shown in FIGS. 7A and 7B are as described in the above pipe joint, and the pipe socket The connecting work between the pipe and the pipe to be connected is substantially the same as the adhesive connecting work of the pipe using the pipe joint.

In order to manufacture the above-mentioned pipe with a joint, a method is used in which one end of a plastic pipe is expanded to form a socket 2 and then the circumferential groove 3 and the pin insertion hole 31 on the inner surface of the socket are processed.
Alternatively, a method may be used in which the pipe receiving port is injection-molded separately from the pipe, the circumferential groove 3 and the pin insertion hole 31 on the inner surface of the pipe receiving port are processed, and the pipe receiving port is integrally fused to the pipe end. .

FIG. 8 is a partial cross-sectional view showing another embodiment of the pipe with a joint of the present invention, in which the circumferential groove 3 on the inner surface of the pipe receiving port is formed by ring-shaped diameter expansion molding at the same time when the receiving port 2 is formed. Then, a pin insertion hole 31 is formed in the bottom wall of this groove 3, a C-shaped cracking ring 4 for retaining is fitted in the circumferential groove 3, and a pin 5 is inserted into the pin insertion hole 31, and the tip of this pin 5 is inserted. C-shaped crack ring 4
The C-shaped crack ring 4 is expanded in diameter by fitting into the crack. In the pipe with a joint of this another embodiment, the bottom wall of the circumferential groove 3 can be made relatively thick, which is mechanically advantageous.

[0030]

The pipe joint and the pipe with a joint of the present invention are constructed as described above, and the pipe can be connected by removing the pin after inserting the pipe insertion port into the pipe receiving port through the adhesive, Since the pin can be removed with one touch, you can easily connect the plastic pipe as easily as when using the conventional TS method (for example, when retaining with a clamp and a bolt, the number of work steps is complicated and complicated. With)
Even if the function of the adhesive is lost, the retaining ring can well maintain the elastic contact with the tube insertion port at the back of the pipe receiving port, so unlike the conventional TS connection method,
Sudden water leakage can be avoided and only slow water leakage can be achieved. Therefore, repairs can be made before serious problems such as interior flooding occur, and damage can be limited.

[Brief description of drawings]

FIG. 1 (a) is a side view showing a partial cross-section of an embodiment of a pipe joint of the present invention, and FIG. 1 (b) is a cross section taken along the line of FIG. 1 (a) of the same embodiment. It is a figure.

FIG. 2 is a perspective view showing each example of the inner peripheral portion of the retaining ring used in the pipe joint of the present invention.

FIG. 3 is a partial cross section showing a work procedure of a pipe connecting method using the pipe joint of the present invention.

FIG. 4 is a cross-sectional view showing another example of the pin used in the pipe joint of the present invention.

5 (a) is a front view showing another example of the pin used in the pipe joint of the present invention, and FIG. 5 (b) is a bottom view of the same.

FIG. 6 is a cross-sectional view showing a usage state of another embodiment of the pipe joint of the present invention different from the above.

7 (a) is a side view showing a partial cross-section of an embodiment of a pipe with a joint of the present invention, and FIG. 7 (b) is a view showing the same embodiment.
It is a sectional view taken along line (a) of FIG.

FIG. 8 is a sectional view showing another embodiment of the pipe with a joint of the present invention different from the above.

FIG. 9 is a partial cross-sectional view showing a conventional example.

[Explanation of symbols]

2 pipe socket 3 circumferential groove 4 retaining ring 31 pin insertion hole 5 pin

Claims (2)

[Claims] 1. A circumferential groove is provided on an inner peripheral surface of a pipe receiving opening to which an insertion opening of a pipe to be connected is adhered with an adhesive, and a retaining ring is forcibly expanded in diameter in the circumferential groove. A pipe joint, which is accommodated in a state, and is capable of canceling the forced expansion from the outside of the receiving port. 2. A circumferential groove is provided on the inner peripheral surface of the pipe receiving opening at the end of the pipe to which the insertion opening of the pipe to be connected is adhered by an adhesive, and the retaining ring is forcibly inserted into the circumferential groove. A pipe with a joint, which is accommodated in a state of being expanded in diameter and is capable of canceling the forced expansion from outside the receiving port.