JP2003021280A - Packing for joint and pipe connecting structure using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connecting structure allowing fully opposing a drawing force while securing a high watertightness. SOLUTION: A cylindrical packing for a joint 6 is interposed between a pipe joint 1 and an end part of a straight pipe 4 inserted into a cylindrical part 3 of the pipe joint 1. The packing 6 comprises a soft section 10 for cut-off at a tip part positioning on the inserting end face 7 side of the straight pipe 4 and a hard section 11 for preventing falling to prevent the packing 6 from falling from the pipe joint 1 by engaging with a member 19 for preventing falling fixed on the pipe joint 1 at the rest rear end part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint packing used for a connecting portion of a pipe and a pipe connecting structure using the joint packing.

[0002]

2. Description of the Related Art Conventionally, when connecting a straight pipe and a pipe joint such as a joint for connecting different types of pipes, after inserting the end portion of the straight pipe into the end portion of the pipe joint, the gap between these end portions is closed. In this way, several kinds of waterproof tape were wrapped. However,
Winding of the waterproof tape has to rely on manual work,
It took a lot of effort and time. Moreover, it was difficult to secure stable watertightness.

Therefore, in recent years, instead of wrapping a water blocking tape, a packing is interposed between the ends of the pipe joint and the straight pipe so that the connection work can be performed easily in a short time. In addition, stable watertightness can be secured.

[0004]

However, as this type of packing, in many cases, a soft rubber one is used in order to ensure high watertightness by closely adhering to a pipe joint or a straight pipe, Therefore, when a force is applied to the straight pipe in the pulling direction due to an earthquake or the like, the packing easily elastically deforms, and the straight pipe or the packing comes out from the end of the pipe joint. However, if a packing made of hard rubber that is not easily elastically deformed is used to counter such pull-out force, it will no longer adhere to the pipe joint or straight pipe, making it difficult to secure high water tightness. There was a problem.

Therefore, the present invention provides a joint packing capable of resolving the above-mentioned problems and ensuring a high water-tightness, and also sufficiently resisting the pulling force, and a pipe connecting structure using the same. With the goal.

[0006]

In order to solve the above-mentioned problems, the packing for a joint according to the present invention comprises:
A tubular joint packing inserted between the end of one of the pipes and the end of the other pipe, which is the tip end portion or the remaining portion located on the insertion end face side of the other pipe. One of the rear end portions is a soft portion for stopping water, and the other of the front end portion or the rear end portion is engaged with one of the pipe sides to seal the packing from the end portion of the one pipe. It is characterized in that it is made of a hard part for preventing slipping out to prevent slipping out.

[0007] A tubular joint packing interposed between the end portion of one pipe and the end portion of the other pipe inserted into the end portion of the one pipe. The tip located on the insertion end face side of the pipe is made a soft part for water stoppage, and the remaining rear end is engaged with one pipe side to prevent the packing from coming off from the end of one pipe. It is characterized in that it is a hard part for retaining.

Further, one or a plurality of protrusions are formed on the inner and outer peripheral surfaces of the soft portion along the circumferential direction thereof. In addition, a step is formed on the outer peripheral surface of the hard portion so as to come into contact with a retaining member attached to the end of one of the tubes to prevent the packing from moving in the removing direction.

In the pipe connecting structure of the present invention, a tubular joint packing is interposed between the end of one pipe and the end of the other pipe inserted into the end of the one pipe. The packing for a joint has one of the tip end portion or the remaining rear end portion located on the insertion end face side of the other tube as the water blocking soft portion, and the above-mentioned tip end portion or rear end portion is used. The other of the two is a hard part for retaining to prevent the packing from coming off from the end of one pipe by engaging with one pipe side.

The hard portion of the joint packing is adhered to the inner peripheral surface of one pipe or the outer peripheral surface of the other pipe.
Further, one pipe is made of a pipe joint and the other pipe is made of a straight pipe.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a pipe connection structure according to an embodiment of the present invention, FIG. 2 is an enlarged view of an essential part of the same, and FIG. 3 is a perspective view of a joint packing.

In the drawings, (1) is a pipe joint for connecting different types of pipes, for example, made of synthetic resin, as one pipe of the present invention. An annular protrusion (2) is formed in the center of the inner peripheral surface of the pipe joint (1), and a tubular portion (2) is sandwiched between the annular protrusions (2). 3) (3) is formed. These cylindrical portions (3), (3) have a shape in which the diameter is expanded in three stages as the distance from the annular protrusion (2) increases.

The end of a straight pipe (4) made of, for example, steel, which is the other pipe of the present invention, is inserted into the tubular portion (3) on the one end side of the pipe joint (1), and The end of the spiral corrugated pipe (5) made of synthetic resin is inserted into the tubular portion (3) on the end side,
These are in communication with each other.

(6) is a tubular portion on one end side of the pipe joint (1)
(3) A substantially cylindrical joint packing interposed between the straight pipe (4) and the straight pipe (4). As shown in FIGS. 2 and 3, the joint packing (6) has a distal end located on the insertion end face (7) side of the straight pipe (4) as a soft part (10) for stopping water. The other rear end part is a hard part (11) for retaining.

In manufacturing the packing (6), for example, a soft rubber having a hardness of about 40 degrees and a hard rubber having a hardness of about 90 degrees are put into a mold and vulcanized, so that the soft portion (10) and the hard portion (11) are formed. ) And are integrally molded. The rubber material used for the soft part (10) and the hard part (11) may be the same kind of rubber or a chemically similar rubber, and may be integrally bonded to each other by simultaneous vulcanization. For example, natural rubber or synthetic rubber may be used. Further, as long as they are chemically similar synthetic resins and are compatible with each other and integrated, the soft portion (10) is made of a soft synthetic resin that is compressible and has good water-sealing property. A hard synthetic resin may be used as the hard portion (11). Furthermore, the hardness of the soft portion (10) and the hard portion (11) is not limited to the above, and can be set arbitrarily.

A plurality of projections (12) (12) having a semicircular cross section are formed on the outer peripheral surface of the soft portion (10) along the circumferential direction. The projections (12), (12), and the like are in pressure contact with the inner peripheral surface of the small-diameter portion (15) of the tubular portion (3) of the pipe joint (1), thereby improving watertightness. Further, on the inner peripheral surface of the soft part (10), a plurality of fin-shaped projections (13) (1
3) ... is formed. And these protrusions (13) (13) ...
However, by making pressure contact with the outer peripheral surface of the straight pipe (4), the watertightness is enhanced.

In this embodiment, the soft part (1
Four protrusions (12), (13) ... Are formed at equal intervals on the inner and outer peripheral surfaces of (0), but the number and interval may be changed as appropriate without being limited to this. Also, the protrusions (12) (1
3) may be formed to have a substantially triangular cross-section so that the tip end of the pipe joint (1) which is in pressure contact with the pipe joint is sharpened. In this case, the watertightness can be further enhanced.

The hard portion (11) is adhered to the middle diameter portion (16) of the tubular portion (3) of the pipe joint (1) and the outer peripheral surface of the straight pipe (4) with an adhesive. As a result, the tensile strength is increased, and even when a force is applied to the straight pipe (4) in the pulling direction,
The straight pipe (4) and the packing (6) are designed not to be easily pulled out from the tubular portion (3) of the pipe joint (1).

Further, on the outer peripheral surface of the hard portion (11), a step (17) is formed along the circumferential direction so as to drop the rear end side with respect to the front end side. This step (17) is formed corresponding to the boundary between the medium-diameter portion (16) and the large-diameter portion (18) of the tubular portion (3), whereby the step () of the hard portion (11) ( The tip end side than 17) is fitted between the medium diameter part (16) and the straight pipe (4), and the rear end side than the step (17) has a gap between the large diameter part (18). In the state, it is arranged between the large diameter portion (18) and the straight pipe (4). Then, a substantially cylindrical retaining member (19) is screwed into the large-diameter portion (18) so as to fit into this gap, and the tip portion of the retaining member (19) has a hard portion ( By contacting the step (17) of 11), the packing (6) is prevented from moving in the removal direction.

Thus, by engaging the hard portion (11) of the packing (6) with the retaining member (19) on the side of the pipe joint (1), a force in the pulling direction is applied to the straight pipe (4). Even packing (6)
However, the straight pipe (4) and the packing (6) cannot be easily pulled out from the tubular portion (3) without being easily deformed.

(20) is a tubular portion on the other end side of the pipe joint (1)
It is a packing made of soft rubber interposed between the small diameter portion (15) and the spiral corrugated pipe (5) in (3). This packing (2
0) is formed in a short cylindrical shape, and on its inner peripheral surface, a water blocking projection (22) screwed into the spiral groove (21) of the spiral corrugated pipe (5).
Are formed.

Reference numeral (25) is a substantially cylindrical fitting member made of synthetic resin, which is fitted onto the spiral corrugated pipe (5). This mating member (25)
A protrusion (26) for locking that is screwed into the spiral groove (21) of the spiral corrugated pipe (5) is formed on the inner peripheral surface of the, and a step () is formed on the outer peripheral surface along the circumferential direction. 27) has been formed. Then, a substantially cylindrical retaining member (19) is screwed into the large-diameter portion (18) of the tubular portion (3) on the other end side, and the tip of the retaining member (19) is By contacting the step (27) of the fitting member (25),
Withdrawal of the fitting member (25) and the spiral corrugated tube (5) from the tubular portion (3) is prevented.

The present invention is not limited to the above embodiment, and it goes without saying that many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, one of the pipes is not limited to the pipe joint, but may be a general straight pipe, a corrugated pipe, or the like. The other pipe is not limited to the straight pipe, but may be a pipe joint, a corrugated pipe, or the like. further,
In the joint packing, the tip end portion located on the insertion end face side of the other tube may be a hard portion for retaining, and the remaining rear end portion may be a soft portion for stopping water.

[0024]

As is clear from the above description, if the joint packings of the present invention are used to connect the pipes to each other, it is possible to secure high watertightness due to the soft portion having excellent adhesion, and also to prevent deformation. Even if a force in the pull-out direction is applied to the other pipe due to an earthquake or the like by engaging the hard part with less heat on one pipe side, it sufficiently resists the pull-out force and the packing from one pipe or the other It is possible to reliably prevent the tube from coming off.

Further, since the ring-shaped protrusions are formed on the inner and outer peripheral surfaces of the soft part of the joint packing, the protrusions are brought into pressure contact with the inner peripheral surface of one pipe or the outer peripheral surface of the other pipe to thereby ensure water tightness. The property can be further improved.

Further, since the retaining member on the one pipe side is brought into contact with the step formed on the outer peripheral surface of the hard portion of the joint packing, movement of the packing in the detaching direction is prevented. The packing can have a simple shape, and the manufacturing cost can be reduced.

Furthermore, the hard part of the packing for the joint is
By adhering to one pipe or the other pipe, the tensile strength can be increased and a highly reliable connection structure that does not easily pull out can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a pipe connection structure according to an embodiment of the present invention.

FIG. 2 is also an enlarged view of the relevant part.

FIG. 3 is a perspective view of a joint packing.

[Explanation of symbols]

(1) Pipe fitting (one pipe) (4) The other pipe (straight pipe) (6) Packing for joint (7) Insertion end face (10) Soft part (11) Hard part (12) (13) Protrusion (17) Step (19) Locking member

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Claims (7)

[Claims] 1. A tubular packing for a joint which is interposed between the end of one pipe and the end of the other pipe inserted into the end of the one pipe, wherein One of the tip end portion or the remaining rear end portion located on the insertion end face side of the pipe is a soft portion for stopping water, and the other of the tip end portion or the rear end portion is
A packing for a joint, characterized in that the packing is a hard portion for engaging with one of the tubes to prevent the packing from coming off from an end of the one tube. 2. A tubular joint packing interposed between the end of one pipe and the end of the other pipe inserted into the end of the one pipe, wherein The tip located on the insertion end face side of the pipe is a soft part for water stopping, and the remaining rear end is
A packing for a joint, characterized in that the packing is a hard portion for engaging with one of the tubes to prevent the packing from coming off from an end of the one tube. 3. The packing for a joint according to claim 1, wherein one or a plurality of protrusions are formed on the inner and outer peripheral surfaces of the soft portion along the circumferential direction thereof. 4. A step is formed on the outer peripheral surface of the hard portion so as to come into contact with a retaining member attached to the end of one of the pipes to prevent the packing from moving in the detaching direction.
Packing for a joint according to any one of 1. 5. In a connection structure in which a tubular packing for a joint is interposed between the end of one pipe and the end of the other pipe inserted into the end of this one pipe, The packing is
One of the tip end portion or the remaining rear end portion located on the insertion end face side of the other pipe is used as a water blocking soft portion, and the other of the above tip end portion or rear end portion is used as one pipe. A connecting structure for a pipe, characterized in that the connecting portion is a hard portion for preventing the packing from coming off from an end portion of one pipe by engaging with a side. 6. The rigid portion of the joint packing is bonded to the inner peripheral surface of one pipe or the outer peripheral surface of the other pipe.
Connection structure of the described pipe. 7. The pipe connecting structure according to claim 5, wherein one of the pipes is a pipe joint and the other pipe is a straight pipe.