JPH0710153Y2 - Buried plug joint - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention has a function of sealing watertightly or airtightly with an inserted pipe, and is particularly suitable for burial underground. Regarding plug joints.

[Prior Art] As an insertion plug-in joint having a sealing function as described above, as shown by a solid line in FIG. 4, a connection port portion 101 into which a pipe A is inserted is formed in a tapered shape and this connection is made. A joint body 100 having a stepped portion 102 whose rear side has a small diameter is formed behind the mouth portion 101, and an elastic seal is provided in a space 103 surrounded by the joint body 100 and the pipe A inserted therein. A plug joint in which a member 104 and a retaining ring 105 arranged on the connection port end side of the seal member 104 are interposed is known. In the plug-in joint shown in FIG. 4, when the pipe A is inserted into the joint body 100, the seal member 104 comes into close contact with the inner peripheral surface of the joint body 100 and the outer peripheral surface of the pipe A and seals between them in a watertight or airtight manner. To do. Also, the fitting body 100
When trying to pull out the pipe A from the pipe A, the retaining ring 105 abuts on the tapered inner peripheral surface of the tapered connection port portion 101 and is reduced in diameter, and it bites into the outer peripheral surface of the pipe A to escape the pipe A. Stop.

However, in the insertion joint as shown in FIG. 4, there is a clearance C between the connection port end of the joint body 100 and the outer peripheral surface of the pipe A.
Since it is formed, when it is buried in the ground, muddy water or the like flows into the space 103 from the clearance C,
There is a problem that the seal member 104 and the retaining ring 105 are adversely affected and the sealing function and the retaining effect are reduced. As a plug-in joint for solving such a problem, Japanese Utility Model Laid-Open No. 63-147985 discloses a plug-in joint for embedding which is provided with a collar 108 and an O-ring 106 as shown by a chain line in FIG. That is, the embedded plug-in joint disclosed herein is configured such that the joint main body 1 has the joint main body 1
Collar 108 that conforms to the shape of the outer peripheral surface of the connection port portion 101 of 00 and forms a gap 107 in front of the connection port end of the joint body 100.
And the O-ring 106 is housed in the space 107. The O-ring 106 allows the clearance C
It is designed to prevent the inflow of muddy water into the space 103 from.

[Problems to be Solved by the Invention] However, the plugging joint for embedding provided with the collar 108 and the like shown in FIG. 4 does not operate the retaining ring 105 from the outside to stop its function. After connecting A, this pipe A cannot be removed. Therefore, the collar 108 that prevents the inflow of muddy water from the clearance C is also simply fixed to the joint body 100. That is, the one disclosed in Japanese Utility Model Application Laid-Open No. 63-147985 did not consider reusability at all.

An object of the invention is to provide a joint body having a tapered connection port portion into which a pipe is inserted and a stepped portion formed on the rear side of the connection port portion and having a small diameter on the rear side. In a space surrounded by a pipe inserted into the joint body from the connection port, a plug-in joint in which an elastic ring-shaped seal member and a retaining ring arranged on the connection port end side of this seal member are interposed. Therefore, it is another object of the present invention to provide an embedding plug joint for embedding, which enables the once connected pipe to be removed and prevents mud water and the like from flowing into the space inside the joint body. [Means for Solving the Problems] In order to achieve the above-mentioned object, the embedded plug joint according to the present invention is engaged with the tapered connection port of the joint body at the connection port end side with the retaining ring. A through hole for inserting the removal tool is bored, and the joint body is in close contact with the joint body outer peripheral surface from the stepped portion to the connection port end and the pipe outer peripheral surface of the connection port end peripheral edge, and the connection port. It is characterized in that it covers a seal cover that can be rolled up from the end side and that can expose the through hole by this rolling up.

[Operation] In the plug-in joint for embedding configured as described above, in the normal state after connecting the pipes, the through hole provided in the joint body and the clearance between the joint body and the outer peripheral surface of the pipe are covered with the seal cover. Therefore, inflow of muddy water and the like into the space inside the joint body is prevented. Further, by rolling up the seal cover to expose the through hole and inserting a tool from the through hole into the joint body to prevent displacement of the retaining ring, the once inserted tube can be pulled out.

[Embodiment] The present invention will be described below based on an illustrated embodiment.

As shown in FIG. 1, the joint body 1 includes a stepped portion 3, 3 provided on both sides of a narrowed portion 2 formed in a central portion in the axial direction and a cylindrical portion continuous with the stepped portions 3 and 3. Through 4,4,
Connection ports 5, 5 into which the pipes A, A are respectively inserted are provided. That is, when viewed from each of the connection ports 5, a stepped portion 3 which is a narrowed portion 2 having a small diameter on the rear side is formed on the rear side thereof. The connection port portion 5 is formed in a tapered shape, and therefore the inner and outer peripheral surfaces thereof are tapered surfaces. Also, the connection port 5
A through hole 6 for inserting a tool for pipe removal, which will be described later, is formed at an appropriate position in the hole. Such a joint body 1
Is often made of stainless steel, casting, etc., but the material is not particularly limited.

The joint body 1 is covered with seal covers 7, 7 that are in close contact with the outer peripheral surface of the joint body 1 from the stepped portion 3 to the connection port end 5a. That is, these seal covers 7 and 7 are made of elastic material such as soft rubber such as EPDM, and the inner diameter dimension corresponding to the outer diameter dimension of each part of the joint body 1 is slightly smaller. When it is attached to the joint body 1, it is in close contact with the outer peripheral surface of the joint body 1. The seal cover 7 is also provided with a thick annular tightening portion 7a protruding forward from the portion corresponding to the connection port end 5a. The tightening portion 7a has an inner diameter slightly smaller than the outer diameter of the pipe A. By being formed, the connection port end is formed on the entire circumference.
It is in close contact with the outer peripheral surface of the pipe A at the periphery of 5a. Further, a thick holding portion 7b is formed at a position corresponding to the stepped portion 3 at the rear end of the seal cover 7. The holding portion 7b is reduced in diameter so as to approach the outer peripheral surface of the narrowed portion 2 on the smaller diameter side of the stepped portion 3, and in some cases, is brought into close contact with the outer peripheral surface, whereby the stepped portion 3 to the seal cover 7
Is held. Since the seal cover 7 as described above is also formed of the above-mentioned flexible flexible stretchable material, it can be rolled up starting from the tightening portion 7a as shown in FIG. Thus, the through hole 6 formed in the connection port portion 5 can be exposed. At this time, since the seal cover 7 is held by the joint body 1 by the holding portion 7b, even if the contact area with the joint body 1 becomes small due to the above-described winding, the position does not easily shift.

An annular seal member 9 having elasticity is interposed in the space 8 surrounded by the joint body 1 and the pipe A inserted therein. The seal member 9 may have a mere rectangular cross section whose outer peripheral surface as shown in FIG. 1 is in close contact with the inner peripheral surface of the joint body 1 and whose inner peripheral surface is in close contact with the outer peripheral surface of the pipe A. For example, like a seal member 9'shown in FIG. 3, a concave groove 10 is formed on the side communicating with the opening of the pipe A, that is, on the back side, and a tongue portion 11 forming the concave groove 10 is formed. , 1
2 is made to adhere more strongly to the inner peripheral surface of the joint body 1 and the outer peripheral surface of the pipe A by the pressure of the fluid in the pipe A, so that the sealing property according to the fluid pressure can be exhibited. The shape is not limited to a particular shape.

In the space 8, a retaining ring 13 is arranged on the connection port end 5a side, that is, the front side of the seal member 9. The retaining ring 13 is displaced in the pull-out direction by following the pipe A before the pipe A is completely pulled out when a force in the pull-out direction is applied to the pipe A inserted into the joint body 1. Along with the displacement, the diameter is reduced by hitting the tapered inner peripheral surface of the connection port portion 5. Due to this diameter reduction, the corners of the notch 14 formed on the entire surface are formed on the outer peripheral surface of the pipe A. It is designed to bite into the concave portion a to prevent the pipe A from coming off.

In the embodiment, a retainer 15 that is movable in the axial direction is interposed between the seal member 9 and the retaining ring 13.

As is clear from the above description, in the above-mentioned plug-in joint for embedding, the seal cover 7 normally closes the through hole 6 formed in the connection opening 5 of the joint body 1 and the tightening portion 7a prevents The clearance C between the connection port end of the joint body 1 and the pipe A is shielded from the outside. Therefore, muddy water or the like does not flow into the space 8 inside the joint body 1 from the through hole 6 and the clearance C.

Next, when removing the pipe A from the joint body 1, as shown in FIG. 2, the through hole 6 is exposed by rolling up the seal cover 7 starting from the tightening portion 7a, and the removing tool T is removed from this through hole 6. Plug in. When a force in the pull-out direction is applied to the pipe A with the tool T inserted in this way, the tool T causes the connection port end 5a of the retaining ring 13 to be removed.
The displacement to the side can be prevented. Therefore, when a further pulling force is applied to the pipe A, the notch 14 of the retaining ring 13 is pushed by the recess a of the pipe A and rotates as indicated by the arrow in FIG. The retaining effect due to the bite of C does not function and the pipe A can be pulled out.

The seal cover closes the through hole formed in the connection port and shields the clearance between the connection port end and the outer peripheral surface of the pipe from the outside, and winds up the connection port end to expose the through hole. Anything can be used.

Further, the retaining ring 13 does not have to have the cutout portion 14 as in the embodiment, and may have a simple circular cross section or another shape. What kind of cross-section shape retaining ring
Whether or not 13 is used may be appropriately selected according to the material of the pipe A (for example, stainless steel or synthetic resin such as polyvinyl chloride resin or polyethylene resin), and the mechanism for preventing slippage also changes accordingly.

[Effects of the Invention] According to the burying joint for burying of the invention, it is possible to connect the pipe once connected to the through hole for inserting the tool in order to allow the pipe to be pulled out, but it is possible to use it in the ground. While buried, muddy water and the like will not flow in not only from the through hole but also from the clearance between the connection port end and the pipe outer peripheral surface. Therefore, it is possible to reliably prevent damage to the seal member and the retaining ring in the joint body due to such inflowing muddy water. Moreover, when the through hole is used, the workability is extremely good because it is only necessary to wind up the seal cover.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing a usage state of a plug-in joint for burying, FIG. 2 is a sectional view of a main part showing a state in which a seal cover is wound up, and FIG. 3 is a main part showing a modified example of a seal member. FIG. 4 is a sectional view of a main part of a conventional example. 1 ... Fitting body, 3 ... Stepped portion 5 ... Connection port, 5a ... Connection port end 6 ... Through hole, 7 ... Seal cover 8 ... Space, 9 ... Seal member 13 ... Dropout Stop ring

Claims (1)

[Scope of utility model registration request] 1. A joint body having a tapered connection opening into which a pipe is inserted and a stepped portion formed on the rear side of the connection opening and having a small diameter on the rear side. A plug joint in which an elastic ring-shaped seal member and a retaining ring arranged on the connection port end side of the seal member are provided in a space surrounded by a pipe inserted into the joint body from the connection port A through hole for inserting a removal tool that engages with the retaining ring at the connection port end side is formed in the tapered connection port portion of the joint body, and the joint body from the stepped portion. The seal cover is closely attached to the outer peripheral surface of the joint body reaching the connection port end and the pipe outer peripheral surface of the peripheral edge of the connection port end, and can be rolled up from the connection port end side and the through hole can be exposed by this winding up. hand Burial bayonet joint, characterized in Rukoto.