JPH083354B2 - Sealing material for pipe fittings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a pipe joint seal member which is interposed between a receiving portion and an insertion portion of a pipe joint and seals the two in a liquid-tight manner. Regarding

(Prior Art) For example, in the case of vertically piped water pipes in a building, as shown in Japanese Utility Model Laid-Open No. Sho 61-175684, an insertion portion is inserted into a receiving portion. Then, a pipe joint for joining the pipes to each other is used. In the case of vertical piping, the receiving portion is arranged so as to open upward, and the insertion portion is inserted into the receiving portion from above. In such a pipe joint, an elastic seal member such as rubber is interposed between the receiving portion and the insertion portion. In the above publication, a cylindrical seal member is arranged in the receiving portion. The sealing member is provided with an annular tongue piece that projects inward on the inner rear side on the inner peripheral surface, and the opening side end surface of the receiving portion projects inwardly separately from the tongue piece. An annular drain fold is provided. The annular tongue piece and the drainage pleats are in close contact with the outer peripheral surface of the insertion opening when the insertion opening is inserted into the receiving opening. In such a state, the ring-shaped tongue seals the space between the receiving part and the insertion part in a liquid-tight manner, and the drainage fold allows the water traveling along the outer peripheral surface of the insertion part to separate between the insertion part and the sealing member. It is prevented from staying between the opening edge.

(Problems to be Solved by the Invention) In the seal member disclosed in the above publication, since the drainage pleats are formed separately from the annular tongue, the drainage folds are easily damaged when the material deteriorates with time. May occur.
When vibration or the like acts on the insertion part, the pleats for draining are
More easily damaged. If the drainage pleats are damaged, water will collect between the opening and the opening end of the seal member, and if the opening is composed of the end of the metal pipe, the opening will be corroded.

Further, the outer peripheral surface of the sealing member is in close contact with the inner peripheral surface of the receiving portion to seal the sealing member and the receiving portion. In this way, the flat surfaces are in close contact with each other, so that the space between them is merely sealed, and there is a problem that the sealing property between them is poor.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a pipe joint seal member which has a relatively simple structure and which can prevent water and the like from accumulating between the insertion part and the insertion part over a long period of time. To provide. Another object of the present invention is to
An object of the present invention is to provide a seal member for a pipe joint, which is excellent in the sealing property between the insertion part and the receiving part.

(Means for Solving the Problem) The seal member for a pipe joint according to the invention of the claims of the present application is disposed in the receiving portion, and a gap between the inserting portion and the receiving portion to be inserted into the receiving portion. A sealing member for pipe fittings that seals liquid-tightly and has elasticity and is located on the outer peripheral surface of the insertion opening when the insertion opening is inserted into the receiving opening A cylindrical seal main body that does not come into contact with the inner peripheral surface thereof, and an end portion of the seal main body on the opening side of the receiving portion, which is disposed so as to project inward from the inner end. An annular tongue piece whose inner peripheral surface is in close contact with the outer peripheral surface of the insertion opening when the insertion opening is inserted into the receiving opening, and whose outer peripheral surface does not contact the inner peripheral surface of the seal main body; It is installed on the outer peripheral surface of the so as to incline outward toward the inner side of the receiving part, and its outer peripheral surface is in close contact with the inner peripheral surface of the receiving part when mounted in the receiving part. And a ring-shaped press contact piece, wherein the sealing member for a pipe joint according to the invention of claim 2 is arranged in a receiving portion having a tubular groove on the inner peripheral surface of the opening end, A sealing member for a pipe joint, which seals a gap between an insertion opening inserted into the receiving opening and the receiving opening in a liquid-tight manner, and has elasticity and when the insertion opening is inserted into the receiving opening. The cylindrical outer peripheral surface of the inner peripheral surface of the inner peripheral portion of the opening of the receiving portion does not come into contact with the outer peripheral surface of the insertion opening of the Is arranged so as to project inwardly from the inner side of the seal part, and the inner peripheral surface of the inner peripheral surface is in close contact with the outer peripheral surface of the insertion part when the insertion part is inserted into the receiving part and the inner peripheral surface of the seal body part. A ring-shaped tongue whose outer peripheral surface does not contact the outer surface and a ring-shaped tongue of the receiving portion when mounted in the receiving portion when protruding outward. The annular projection that fits in the groove and the outer peripheral surface of the seal main body are arranged so as to project outward inwardly of the inside of the receiving part, and when mounted in the receiving part, An annular press-contact piece whose outer peripheral surface is in close contact with the inner peripheral surface of the receiving portion, and an annular packing which is attached to the inner back portion of the receiving portion and to which the end surface of the insertion portion inserted into the receiving portion is butted. It is equipped, and the above-mentioned purpose is achieved by that.

(Example) Hereinafter, the present invention will be described with reference to Examples.

FIG. 1 is a vertical cross-sectional view of a pipe joint which is a sealing member of the present invention. The sealing member 10 of the present invention has a receiving portion 21 formed at one end of a connecting pipe 20 as shown in FIG. It is arranged.
Into the receiving portion 21, the insertion portion 31 of the connecting pipe 30 is inserted from the opening 21d on the end surface. The receiving portion 21 has an annular groove 21a having a triangular cross section on the inner peripheral surface on the tip side.

The seal member 10 of the present invention has a cylindrical seal body 11 as shown in FIG. The seal main body portion 11 is fitted in the receiving portion 21, and the inner rear portion thereof has a receiving portion.
It has an inner diameter slightly larger than the outer diameter D ₂ of the insertion opening 31 so that the inner peripheral surface does not contact the outer peripheral surface of the insertion opening when the insertion opening 31 is inserted into the insertion opening 31 (see FIG. 2). .

An annular tongue piece 12 is integrally connected to an end of the receiving portion 21 of the seal body 11 on the side of the opening 21d.
The tongue piece 12 inclines inwardly from the end of the seal body 11 toward the inside of the inner part and projects in a tapered shape. The inner diameter D ₁ of the tip edge of the tongue piece 12 is equal to the seal member 10. Insertion part 31 to be inserted into
It is slightly smaller than the outer diameter D ₂ (see Fig. 2).
Therefore, when the insertion port 31 is inserted into the seal member 10,
The outer peripheral surface of the insertion opening 31 is in close contact with the inner peripheral surface of the tongue piece 12.

The end surface of the seal body 11 on the side where the tongue piece 12 is disposed is substantially orthogonal to the axis, and the inner diameter of the opening in the end surface is substantially equal to the outer diameter of the insertion opening 31.

The inner peripheral surface of the seal body 11 facing the tongue 12 has a taper shape in which the diameter gradually decreases toward the inner depth, and the insertion port 31 is inserted into the tongue 12. Is the tongue 12
Even when the inner peripheral surface is in close contact with the outer peripheral surface of the insertion opening 31, the tongue piece 12
The outer peripheral surface does not contact the inner peripheral surface of the seal body 11, and a slight gap is formed between them.

An annular protrusion 13 having a triangular cross section is provided on the outer peripheral surface of the end of the seal body 11 on which the tongue piece 12 is disposed. The ridge 13 is fitted into the annular groove 21a of the receiving portion 21 when the sealing member 10 is mounted in the receiving portion 21, and the entire sealing member 10 falls off from the receiving portion 21. To prevent

Further, an annular press-contact piece 14 is provided on the outer peripheral surface of the central portion of the seal body 11. The press contact piece 14 is located outside the end of the seal body 11 opposite to the end on which the tongue piece 12 is arranged,
That is, it is formed by cutting and raising the outer peripheral side portion of the seal main body portion 11 so that the seal member 10 is inclined and protrudes to the outside of the inner side of the receiving portion 21 when the sealing member 10 is mounted on the receiving portion 21. There is. The outer diameter of the tip edge of the pressure contact piece 14 is slightly larger than the inner diameter of the receiving portion 21.

The seal member 10 of the present invention having such a structure has the connection pipe 20.
When it is mounted in the receiving portion 21 in, the annular protrusion 13 provided on the outer peripheral surface of the seal body portion 11 is fitted into the annular groove 21a provided on the inner peripheral surface of the receiving portion 21. . As a result, the sealing member 10 is prevented from falling off the receiving portion 21. At the same time, the pressure contact piece 14 provided on the outer peripheral surface of the seal body 11 is pressed against the inner peripheral surface of the receiving portion 21, and the entire outer peripheral surface thereof is in close contact with the inner peripheral surface of the receiving portion 21.

In such a state, the insertion port portion 31 of the connection pipe 30 is inserted into the seal member 10. The insertion opening 31 is inserted into the tongue piece 12 through the end opening of the seal body. At this time, the tongue piece 12 is brought into close contact with the outer peripheral surface of the insertion opening portion 31 sequentially from the tip, and the entire tongue piece 12 is indexed in the insertion direction of the insertion opening portion 31. At this time, the outer peripheral surface of the tongue piece 12 does not contact the inner peripheral surface of the seal body 11 and a slight gap is formed between the two, so that the insertion opening 31 can be smoothly inserted into the tongue piece 12.
It is inserted inside. Then, when the insertion opening 31 penetrates the tongue piece 12, the entire inner peripheral surface of the tongue piece 12 is brought into close contact with the outer peripheral surface of the insertion opening 31, as shown in FIG. As a result, the seal member 10 is
A reliable seal is provided between the opening 21 and the insertion opening 31 inserted into the receiving opening 21. At this time, since the end of the seal body 11 on the side where the tongue 12 is disposed is indexed by the tongue 12, it strongly abuts on the outer peripheral surface of the insertion opening 31, and both are securely sealed in a liquid-tight manner. . As a result, there is no possibility that water or the like will accumulate in that portion.

In this way, with the connecting pipes 20 and 30 joined,
A liquid such as water flows through each of the connecting pipes 20 and 30. At this time, when water enters between the seal member 10 and the insertion opening 31, the water enters the gap between the tongue piece 12 and the seal body 11, and the water between the tongue piece 12 and the insertion opening 31. The space is sealed tightly and there is no risk of water leaking through the gap.

Similarly, when water enters between the inner peripheral surface of the receiving portion 21 and the outer peripheral surface of the seal body 11, the pressure contact piece 14 provided on the outer peripheral surface of the seal body 11 and the outer peripheral surface of the seal body 11 will be separated. The water is introduced into the pressure contact piece 14, and the pressure contact piece 14 is expanded in diameter and strongly pressed against the inner peripheral surface of the receiving portion 21. As a result, the space between the pressure contact piece 14 and the receiving portion 21 is reliably sealed, and there is no risk of water leakage from the gap.

A receiving portion provided with a seal member 10 for preventing corrosion of a metal pipe forming a composite pipe in which the inner peripheral surface of the metal pipe is covered with a synthetic resin pipe as a connecting pipe 30 having an insertion portion 31 twenty one
In the inner part of the inside, the ring-shaped packing 50 shown by the chain double-dashed line in Fig. 2
Is attached. The packing 50 is made of a material having elasticity such as rubber, and the end face of the insertion pipe 31 of the connection pipe 30 inserted into the receiving portion 21 by the packing 50 is attached.
As a result, corrosion of the metal pipe forming the connecting pipe 30 is prevented.

(Effect of the invention) When the seal member for a pipe joint according to the invention of claim 1 of the present application is mounted in the receiving portion, the pressure contact piece provided on the outer peripheral surface of the seal body portion is pressed against the inner peripheral surface of the receiving portion. , The entire outer peripheral surface is in close contact with the inner peripheral surface of the receptacle. When the insertion port of the connecting pipe is inserted into the sealing member for pipe fittings in such a state, the inner peripheral surface on the inner depth side of the opening end of the receiving port of the seal main body has an outer peripheral surface of the insertion port. The outer surface of the tongue is not in contact with the inner surface of the seal body, and a slight gap is formed between the two, so that the insertion opening can be smoothly inserted into the tongue. At the same time, the entire inner peripheral surface of the tongue is brought into close contact with the outer peripheral surface of the insertion opening. Further, since the tongue piece-side end portion of the seal main body is indexed by the tongue piece, it is strongly abutted on the outer peripheral surface of the insertion opening portion, so that the insertion opening portion can be reliably sealed. it can. Moreover, since there is a reliable seal between the inner peripheral surface of the receiving portion and the inner peripheral surface of the seal body, there is no risk of water leakage.

Further, when the seal member for a pipe joint according to the invention of claim 2 of the present application is mounted in the receiving portion, the annular protrusion provided on the outer peripheral surface of the seal body portion is provided with the annular concave portion provided on the inner peripheral surface of the receiving portion. While being fitted and fixed in the groove, the pressure contact piece provided on the outer peripheral surface of the seal main body is pressed against the inner peripheral surface of the receiving portion, and the entire outer peripheral surface is in close contact with the inner peripheral surface of the receiving portion. When the insertion port of the connecting pipe is inserted into the sealing member for pipe fittings in such a state, the annular projection is fitted and fixed in the annular groove of the receiving port, so it falls off from the receiving port. There is nothing to do. Also, the inner peripheral surface of the seal main body on the inner side of the opening of the receiving opening does not contact the outer peripheral surface of the insertion opening, and the outer peripheral surface of the tongue does not contact the inner peripheral surface of the seal main body. In addition, since a slight gap is formed between the two, the insertion opening is smoothly inserted into the tongue, and the entire inner peripheral surface of the tongue is brought into close contact with the outer peripheral surface of the insertion opening. Further, since the tongue piece-side end portion of the seal main body is indexed by the tongue piece, it is strongly abutted on the outer peripheral surface of the insertion opening portion, so that the insertion opening portion can be reliably sealed. it can. Moreover, since there is a reliable seal between the inner peripheral surface of the receiving portion and the inner peripheral surface of the seal body, there is no risk of water leakage. Further, since the annular packing can be brought into close contact with the end surface of the insertion portion of the metal pipe that constitutes the connection pipe, its corrosion can be prevented.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a seal member for a pipe joint of the present invention, and FIG. 2 is a vertical cross-sectional view of a pipe joint structure using the seal member. 10 …… Seal member, 11 …… Seal body, 12 …… Tongue, 13
...... Press contact piece, 21 …… Receptacle part, 31 …… Insertion part.

Claims (2)

[Claims] 1. A sealing member for a pipe joint, which is disposed in a receiving portion and liquid-tightly seals a gap between an inserting portion inserted into the receiving portion and the receiving portion, the elastic member having elasticity. A cylindrical seal main body in which the inner peripheral surface on the inner back side of the opening end of the receiving portion does not come into contact with the outer peripheral surface of the inserting portion when the inserting portion is inserted into the receiving portion; The outer peripheral surface of the insertion opening when the insertion opening is inserted into the receiving opening of the receiving end of the insertion opening. An annular tongue whose inner peripheral surface is in close contact with and whose outer peripheral surface does not contact the inner peripheral surface of the seal main body, and the outer peripheral surface of the seal main body,
It is provided with an annular pressure contact piece that is arranged so as to incline and project outward at the inner side of the receiving part, and the outer peripheral surface of which is closely attached to the inner peripheral surface of the receiving part when mounted in the receiving part. Sealing material for pipe joints. 2. A liquid-tight seal is provided in a gap between an insertion opening and an insertion opening, which is disposed in the reception opening having an annular groove on the inner peripheral surface of the opening end and is inserted into the reception opening. A sealing member for a pipe joint, which is elastic and has elasticity and has an inner circumference on the outer peripheral surface of the insertion opening when the insertion opening is inserted into the reception opening A cylindrical seal main body that does not come into contact with the surface and an end of the seal main body on the opening side of the receiving opening are provided so as to project inward from the inner end of the receiving opening. An annular tongue whose inner peripheral surface is in close contact with the outer peripheral surface of the insertion opening when the insertion opening is inserted into the inner peripheral surface of the seal main body, and whose outer peripheral surface does not contact the inner peripheral surface of the seal main body, and the outer peripheral surface of the seal main body. Is arranged so as to project outward, and the ring-shaped projection that fits into the annular groove of the receiving part when mounted in the receiving part, and the outer peripheral surface of the seal body part, the inner part of the receiving part And an annular press-contacting piece that is arranged so as to project outwardly with a slant and whose outer peripheral surface adheres to the inner peripheral surface of the receiving part when mounted in the receiving part, and the inner back part of the receiving part. A sealing member for a pipe joint, which is attached to a pipe and has an annular packing to which an end face of an insertion portion inserted into the reception portion is abutted.