JP2000018456A - Connection structure for pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connection structure which shows satisfactory water tight property, prevents penetration of a front of a pipe through a connection port, and facilitates connection operation. SOLUTION: A substantially cylindrical rubber joint 5 is inserted into a connection port 2 to which a pipe 4 is connected. An aperture edge 2a of the connection port is fitted to a fitting groove 5b formed on a front 5a of the joint 5, and then the rubber joint 5 is attached to the connection port 2. A front of the pipe 4 is inserted into a ring 6 internally fitted to the rubber joint 5. A front surface of the pipe is abutted against a pipe abutting portion 6a formed on an inner periphery of a front portion 6a of the ring 6. The front surface of the ring 6 is abutted against a ring abutting portion 5c formed on an inner periphery of the front of the rubber joint 5. An inner peripheral surface of a rear end 5g of the rubber joint 5 is closely fitted to an outer peripheral surface of the pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connection structure suitably used for connecting a drain pipe by forming a connection port on a side wall of a drainage basin.

[0002]

2. Description of the Related Art Conventionally, when a drain pipe is connected to a public basin which is a kind of drain basin, as shown in FIG.
A connection port 2 is formed in a side wall 1a of the connection port 2 with a hole saw or the like, and a waterproof ring packing 3 is fitted to an edge of the connection port 2 so that a drain pipe 4 is inserted.

[0003]

However, in the connection structure described above, the watertightness between the ring packing 3 and the drain pipe 4 is insufficient, so that unknown water (groundwater) is supplied to the public tank 1.
There was a risk of infiltration into the interior.

In addition, in the above connection structure, the tip of the drain pipe 4 penetrates through the connection port 2 and protrudes into the inside of the public tub 1, so that when the inside of the public basin 1 is inspected or cleaned, it is protruded inward. There is a problem that the tip of the drainage pipe 4 interferes.

SUMMARY OF THE INVENTION The present invention has been made to address the above-described problems, and has as its object to provide good watertightness and prevent the tip of a pipe from protruding through a connection port.
An object of the present invention is to provide a pipe connection structure that can easily perform a connection operation.

[0006]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a pipe connecting structure in which a distal end of a substantially cylindrical rubber joint is inserted into a connecting port to which a pipe is to be connected. And
Fit the rim of the connection port into the fitting groove formed on the outer periphery of the tip of the rubber joint, attach the rubber joint to the connection port, and insert the tip of the pipe into the ring inside the rubber joint. Then, the tip end surface of the pipe is brought into contact with the tube contact portion formed on the inner periphery of the tip portion of the ring, and the tip end surface of the ring is brought into contact with the ring contact portion formed on the inner periphery of the tip portion of the rubber joint. The inner peripheral surface of the rear end portion of the rubber joint is brought into close contact with the outer peripheral surface of the pipe.

According to this pipe connection structure, the inner peripheral surface of the rear end of the rubber joint is in close contact with the outer peripheral surface of the pipe, so that the water tightness between the rubber joint and the pipe is improved. And, since the distal end surface of the ring into which the distal end of the pipe is inserted is stopped by the ring stop formed on the inner periphery of the distal end of the rubber joint,
The tip of the tube does not protrude through the connection port. In addition, this pipe connection structure is extremely simple in connection work as will be described later in detail.

Next, the pipe connecting structure according to a second aspect of the present invention is the same as the first aspect, wherein the rear end of the rubber joint is fastened from the periphery with a ring-opening belt-shaped clamper. It is a feature.

In such a connection structure, the inner peripheral surface of the rear end of the rubber joint is strongly in close contact with the outer peripheral surface of the pipe due to the clamping force of the clamper, so that the watertightness is further improved.

A third aspect of the present invention is a pipe connecting structure according to the first or second aspect, wherein the outer peripheral surface of the distal end portion of the ring is formed as a tapered outer peripheral surface with a taper.
Corresponding to this, the inner peripheral surface of the distal end portion of the rubber joint is a tapered inner peripheral surface with a taper.

In such a connection structure, when the ring is pushed until the distal end surface of the ring comes into contact with a stop portion on the inner periphery of the distal end of the rubber joint, the distal end of the rubber joint is formed by the tapered outer peripheral surface of the ring distal end. Since the bottom surface of the fitting groove on the outer periphery of the distal end is pressed against the rim of the connection port, the watertightness between the connection port and the rubber joint is significantly improved.

Next, the pipe connecting structure according to a fourth aspect of the present invention is the pipe connecting structure according to any one of the first to third aspects, wherein the pipe is slid rearward of the ring near the rear end of the rubber joint. In which a step is formed to prevent the occurrence of a step.

[0013] In such a connection structure, the rear end face of the ring hits the step, and the ring does not come out of the rubber joint. Therefore, the pipe whose tip is inserted into this ring does not come out. If the portion is adhered to the ring with an adhesive or the like, even if a force in the pulling direction acts on the tube, the tube can be more reliably prevented from coming off.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a pipe (drain pipe) connected to a public box by adopting the pipe connecting structure of the present invention, FIG. 2 is an enlarged cross-sectional view of the connecting structure, and FIGS. Is a cross-sectional view for explaining a connection procedure of the connection structure, and FIG. 6 is a perspective view of a ring-opened belt-shaped clamper used in the connection structure.

In this embodiment, as shown in FIG. 1, a circular connection port 2 is formed in a side wall 1a of a public box 1 with a hole saw or the like. A rubber joint 5 is attached to the connection port 2, and a pipe 4 (drain pipe) is connected. The public basin 1 is made of a synthetic resin such as polyvinyl chloride or polypropylene, and a cylinder 1b for adjusting the height is fitted in an opening at the upper end thereof, and a lid receiving portion 1c of the cylinder 1b. Pressure-resistant waterproof resin-container lid 1d.

The rubber joint 5 is made of chloroprene, P
A substantially cylindrical joint made of synthetic rubber such as EDM, NBR or the like or an elastomer, as shown in FIG. 3, a tip 5a of the joint 5 is thickened, and a fitting groove is formed on an outer periphery of the tip 5a. 5b are formed. The rubber joint 5 is attached to the connection port 2 by inserting the tip 5a of the rubber joint 5 into the connection port 2 and fitting the rim 2a of the connection port into the fitting groove 5b on the outer periphery thereof. Have been.

The rubber joint 5 is provided with a ring 6 made of a synthetic resin. As shown in FIG. 3, the ring 6 has a thickened distal end 6a and an outer peripheral surface formed on a tapered outer peripheral surface 6b with a taper. The inner peripheral surface of the distal end portion 5a of the rubber joint 5 is also formed as a tapered inner peripheral surface 5d corresponding to the tapered outer peripheral surface 6b. Further, a ring stopper 5c for retaining the distal end surface of the ring 6 is formed on the inner periphery of the distal end portion 5a of the rubber joint 5, and a pipe (drain pipe) is disposed on the inner periphery of the distal end portion 6a of the ring 6. ) 4 is formed with a tube contact portion 6c for contacting the distal end surface.

As shown in FIGS. 2 to 5, the rubber joint 5 is formed in a multi-stage different diameter cylindrical shape whose diameter gradually decreases as it approaches the rear end, and has two stepped portions 5e. ,
5f exists. The step 5e near the rear end of the joint prevents the ring 6 from sliding rearward as shown in FIG. 5, and the step 5f near the center is formed by the ring 6f as shown in FIG. Is forcibly slid rearward to prevent the ring 6 from coming out of the rubber joint 5 by engaging with the ring tip 6a. Rubber joint 5
The inner diameter of the cylindrical portion in front of the step portion 5f of the
It is desirable to set it slightly larger than the maximum outer diameter of a, and there is an advantage that the ring 6 can be easily slid when set in this way.

In the connection structure of this embodiment, the rubber joint 5 is attached to the connection port 2 as described above, and the distal end of the pipe 4 is attached to a ring 6 provided inside the rubber joint 5 as shown in FIG. Then, the distal end surface of the pipe 4 is abutted against the tube abutment portion 6c on the inner periphery of the distal end of the ring 6, and the distal end surface of the ring 6 is abutted against the ring abutment portion 5c on the inner peripheral end of the rubber joint 5. Then, the rear end 5 g of the smallest diameter of the rubber joint 5 is tightened from the periphery with a ring-opening belt-shaped clamper 7, so that the rear end 5
The inner peripheral surface of g is closely contacted with the outer peripheral surface of the pipe 4, and such a pipe connection structure can be easily constructed according to the following connection procedure.

First, as shown in FIG. 3, the rear end portion 5g and the step portion 5e of the rubber joint 5 are expanded using rubber elasticity.
The ring 6 is forcibly slid backward until the tip 6a of the ring 6 hits the step 5f near the center of the joint. Then, in this state, the distal end portion 5a of the rubber joint 5 is inserted into the connection port 2 formed in the side wall 1a of the public box, and the edge 2
a is fitted into the fitting groove 5b on the outer periphery of the distal end portion of the rubber joint 5, and the rubber joint 5 is attached to the connection port 2.

Next, as shown in FIG. 4, a pipe (drain pipe)
The distal end of the tube 4 is inserted into the ring 6 so that the distal end surface of the tube 4 abuts on a tube stopper 6c on the inner periphery of the distal end of the ring 6, and the tube 4 is further pushed in with the ring 6, as shown in FIG. Then, the distal end surface of the ring 6 is abutted against a ring abutting portion 5c on the inner periphery of the distal end of the rubber joint 5. When the tip of the tube 4 is inserted into the ring 6, if the tip of the tube 4 is coated with an adhesive and adhered to the inner peripheral surface of the ring 6, there is an advantage that the tube 4 can be reliably prevented from coming off. desirable.

As described above, when the ring 6 is pushed until the distal end surface of the ring 6 abuts against the ring abutment portion 5c of the rubber joint 5, the tapered outer peripheral surface 6b at the distal end of the ring 6 acts. 5 is pressed outward,
Since the bottom surface of the fitting groove 5b is strongly pressed against the edge 2a of the connection port, the watertightness between the connection port and the rubber joint is significantly improved.

At the same time, the rear end 5 g of the rubber joint 5
Is elastically restored, and as shown in FIG. 5, since the inner peripheral surface of the rear end portion 5g is in close contact with the outer peripheral surface of the pipe 4, water tightness between the rubber joint 5 and the pipe 4 is also ensured. In addition, the rear end surface of the ring 6 comes into contact with the stepped portion 5e of the restored rubber joint 5 so that the ring 6 cannot slide rearward. The pressure contact with the tapered inner peripheral surface 5d of the portion and the pressure contact between the fitting groove 5b on the outer periphery of the joint tip and the rim 2a of the connection port are maintained. Further, when the tube 4 and the ring 6 are bonded, the tube 4
Even if a force in the pulling direction acts on the tube 4, the tube 4 will not come off.

Finally, the rear end 5 g of the rubber joint 5
Is tightened from the periphery with a ring-opening belt-shaped clamper 7, and the inner peripheral surface of the rear end 5 g is strongly pressed against the outer peripheral surface of the pipe 4 to significantly improve watertightness and prevent the pipe 4 from coming off. To complete the connection work.

As described above, this pipe connection structure can be constructed by a simple work procedure, the pipe 4 does not penetrate through the connection port 2 and protrude into the inside of the public tub 1, and the watertightness is good. .

It should be noted that the clamper 7 of this embodiment has two ends 7b and 7b of an open metal belt 7a as shown in FIG.
7b is bent, and bolts 7d are inserted into bolt insertion holes 7c, 7c formed at both ends 7b, 7b, and a nut 7e is formed.
However, needless to say, the rear end 5g of the rubber joint 5 may be tightened using various clampers having other tightening mechanisms.

The connection structure of the pipe according to the present invention has been described above by taking the case where the drain pipe 4 is connected to the drainage basin as an example. However, the connection structure of the present invention connects the pipes by piercing the connection port. If there is any, it is applicable.

[0029]

The pipe connection structure of the present invention has a remarkable effect that it can be constructed by a simple work procedure, has good watertightness, and does not protrude through the connection port. Therefore, if the drainage pipe is connected to the drainage basin by adopting the pipe connection structure of the present invention, unknown water (groundwater) can be obtained due to good watertightness.
Can be sufficiently prevented from entering the drainage basin,
Further, since the drainpipe does not protrude into the inside of the drainage basin, there is no need to worry about the drainpipe being obstructed during periodic inspection and cleaning work. In addition, even if the pipe is inclined at an allowable angle by the elasticity of the rubber joint, the pipe can be connected, so that the construction is facilitated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a state where a pipe (drain pipe) is connected to a public box by adopting the pipe connection structure of the present invention.

FIG. 2 is an enlarged sectional view of the connection structure.

FIG. 3 is a cross-sectional view illustrating a connection procedure of the connection structure, showing a state before a pipe is inserted.

FIG. 4 is a cross-sectional view illustrating a connection procedure of the connection structure, showing a state where a pipe is inserted into a ring.

FIG. 5 is a cross-sectional view for explaining a connection procedure of the connection structure, showing a state in which a ring into which a pipe is inserted is pushed forward, and a tip end surface of the ring is stopped.

FIG. 6 is a perspective view of a ring-opening belt-shaped clamper used in the connection structure.

FIG. 7 is a cross-sectional view showing a state where a pipe (drain pipe) is connected to a public box by adopting a conventional pipe connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Public square 1a Side wall 2 Connection port 2a Edge of connection port 4 Pipe (drainage pipe) 5 Rubber joint 5a Tip end of rubber joint 5b Fitting groove 5c Ring stopper 5d Inner circumference with tapered constriction Surface 5e, 5f Stepped portion of rubber joint 5g Rear end of rubber joint 6 Ring 6a Tip of ring 6b Outer surface with tapered tapered portion 6c Pipe stopper 7 Ring-opening belt-shaped clamper

Claims (4)

[Claims] An end of a substantially cylindrical rubber joint is inserted into a connection port to which a pipe is to be connected, and an edge of the connection port is fitted into a fitting groove formed on the outer periphery of the distal end of the rubber joint. Attach the rubber joint to the connection port, insert the tip of the pipe into the ring housed in the rubber joint, and abut the tip of the pipe to the pipe abutment formed on the inner circumference of the end of the ring In addition, the front end surface of the ring is abutted against a ring stop formed on the inner periphery of the distal end of the rubber joint, and the inner peripheral surface of the rear end of the rubber joint is brought into close contact with the outer peripheral surface of the pipe. Pipe connection structure. 2. The pipe connection structure according to claim 1, wherein the rear end of the rubber joint is fastened from the periphery by a ring-opening belt-shaped clamper. 3. A method according to claim 1, wherein the outer peripheral surface of the distal end portion of the ring is formed as a tapered outer peripheral surface, and the inner peripheral surface of the distal end portion of the rubber joint is correspondingly formed as a tapered inner peripheral surface. The pipe connection structure according to claim 1 or 2, wherein: 4. A pipe connection according to claim 1, wherein a step is formed near the rear end of the rubber joint to prevent the ring from sliding backward. Construction.