JP2000065212A - Packing for pipe joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing for a pipe joint, which can exhibit a sufficient sealing effect with high adhesion with a pipe and a joint body even when it is applied to a joint in a straight cylindrical shape and the like. SOLUTION: This packing is equipped with an end face closely adhered onto a stepped surface 15 formed in the inside of a joint body 10 to be mounted, and with a ring shaped lip 25 which is projected in the forward obliquely radial and inward direction so as to be gradually thinned toward its tip end in regard to the insertion and advancing direction of a pipe 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing for a pipe joint, and more particularly to a packing for a pipe joint suitable for connecting a conduit for protecting electric wires and cables.

[0002]

2. Description of the Related Art In this type of joint, packing is arranged in the joint body to maintain water tightness, and a seal between the inner peripheral surface of the joint body and the outer peripheral surface of the pipe acts mainly. Examples of conventionally known packings include a cylindrical packing having a hollow central portion with a concave shape, a packing having a flange protruding radially inward at one end, and the like.

[0003]

However, when these packings are used for, for example, a straight cylindrical joint, there are portions where the degree of adhesion to the pipe or the degree of adhesion to the joint body is weak. The sealing effect cannot be fully exerted, leaving room for further improvement in water tightness.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is basically intended to provide an end face which is in close contact with a step formed in a joint body to be mounted, and An annular lip which projects so as to become gradually thinner inward in the oblique radial direction in the forward direction with respect to the insertion advancing direction and toward the distal end.

More specifically, a packing according to the present invention comprises an outwardly projecting annular flange (22) having a flat end surface (21) which is in intimate contact with a step formed in a joint body to be mounted. And an outer peripheral surface (23) substantially horizontally extending from an inner lower edge of the annular flange (22) to define a space (26) by the flange (22); An annular lip (25) projecting in the direction of the arrow and having a substantially triangular cross section defining a space (27) by the inner peripheral surface (24), the lip (25) reducing the obstruction of the insertion of the tube. At the same time, the space (26, 27) serves as a relief for the deformed portion when the packing is deformed by being pressed when the packing is pressed and deformed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. 1 and 2 show a joint that can use a packing according to an example of the present invention. The illustrated joint 1 basically includes a joint main body 10, a packing 20, a collar 30, and a bolt 40.

The joint body 10 has a cylindrical shape, and the inner peripheral surface is a tapered surface 11 whose diameter gradually decreases from both ends to the center, and screw holes are respectively provided near both ends in the axial direction of the peripheral wall. 12 at a position substantially along the axial direction. As shown particularly in FIG. 3, the annular body having an inner diameter substantially equal to or smaller than the outer diameter of the conduit to be connected protruding radially inward from the inner peripheral wall surface at a substantially central portion in the axial direction of the joint body 10. Projection 13 and this projection 13
An annular shelf 14 having an inner diameter slightly larger than the outer diameter of the conduit to be connected extending in the axial direction from the lower edge of the conduit, and a step 15 is formed between the shelf and the tapered surface 11.

The elastic packing 20 and then the collar 30 are inserted into the joint body 10 from both ends in the axial direction.

The packing 20 is provided at the step 15 of the joint body 10.
When the conduit 50 to be connected is inserted into the packing 20 and the connection is completed as described later, the step 15 of the joint body 10 and the outer periphery of the conduit 50 are formed. It has a cylindrical shape having an outer surface and an inner diameter suitable for sealing in a watertight manner in close contact with the respective surfaces. As particularly shown in FIG.
An annular flange 22 having an end surface 21 flat at one end thereof and projecting outward, an outer peripheral surface 23 extending substantially horizontally from an inner lower edge of the annular flange 22, and an inner peripheral surface 24 extending substantially parallel to the outer peripheral surface 23. From the end (the left side in FIG. 4) of the inner peripheral surface 24 in the direction opposite to the annular flange 22, the diagonally inward radial direction is directed forward with respect to the insertion progress direction (the direction of the arrow A) of the conduit tube 50. Annular lip 25 having a substantially triangular cross section and projecting so as to become gradually thinner toward the tip.
And the end face 21 of the outward flange 22 is
It is inserted into the joint body 10 so as to be in close contact with the wall surface of the step 15 of zero. As described later, a space 26 defined by the annular flange 22 and the outer peripheral surface 23 and a space 27 defined by the lip 25 and the inner peripheral surface 24
When pressed by the collar 30 and elastically deformed, it functions as a relief portion during the deformation.

On the other hand, the collar 30 has an annular flange 31 facing outward at one end thereof, and a drill hole (fool hole) 3 near the one end.
2 and 33, and its outer peripheral surface 34
Is a tapered surface complementary to the tapered surface 11 of the joint body 10.

Although not shown in the drawing, the collar 30 has a slit cut out in the axial direction, and the diameter of the collar 30 is reduced by bringing the opposed end faces constituting the slit close to each other. The collar 30 is slightly open before being mounted in the joint body 10 before being mounted, and thus,
As the collar 30 is inserted into the joint body 10, the collar 3
By providing the inner diameter of the collar 30 in close contact with the outer circumference of the conduit 50 by providing the inner diameter of the collar 30 with the tapered surface of the joint main body 10, Can be located at the center of the axis.

A method for connecting the joint body 10 and the conduit tube 50 will be described in detail. The packing 20 is inserted into the joint body 10 such that the end face 21 of the annular flange 22 is in contact with the wall surface of the step 15, and the collar 30 is inserted so as not to reduce its diameter. In this state, a conduit 50 having a diameter substantially equal to or slightly smaller than the diameter of the collar 30 is passed through the packing 20 so that the end face 51 of the conduit 50 has the annular protrusion 1.
Insert until it is close to 3. At this time, the lip 25 of the packing 20 is crushed and elastically deformed by the outer surface 52 of the inserted conduit 50 to allow the passage of the conduit 50.

Next, the collar 30 which has been inserted halfway through the joint body 10 is preferably pushed into the joint body 10 until the outward flange 31 comes into contact with the end face 16. By this insertion, the tip of the collar 30 presses the annular end of the packing 20 in the axial direction, and the lip 25 is further deformed with this,
The joint body 10 elastically deforms the packing 20 so as to increase the thickness thereof and is in contact with the packing 20.
The outer peripheral surface 52 of the conduit 50 and the end surface of the step 15 are in close contact with each other to enhance the watertight sealing effect in the gap therebetween. In particular, since the space 27 formed by the lip 25 and the space 26 formed on the outer peripheral side are compressed, the collar 30 can be easily inserted into the joint body 10 while deforming the packing 20.

As described above, the collar 3 is provided in the joint body 10.
0 is firmly inserted, and the seal by the packing 20 is determined. Then, the bolt 40 is screwed into the screw hole 12, and its tip is brought into contact with the outer surface 52 of the conduit tube 50 through the through hole.
The conduit 50 can be fixed to the joint body 10 while maintaining the sealing effect of the packing 20.

[0015]

As described above, according to the present invention, the end face of the annular flange is formed on the step surface, the inner circumferential surface and the outer circumferential surface of the pipe to be connected, respectively, formed in the joint body to be mounted.
The outer peripheral surface and the lip are sufficiently adhered to each other, and the gap between them is sufficiently sealed, so that a better water-tight effect can be exhibited as compared with the conventional packing. In addition, in particular, by forming two spaces by a special shape of the packing and by using such spaces as reliefs of the deformed portion of the packing, a tight seal by stronger pressing is performed.

[Brief description of the drawings]

FIG. 1 is an assembly view of a joint incorporating a packing according to an example of the present invention.

FIG. 2 is an exploded view of the joint of FIG.

FIG. 3 is a sectional view of a joint body of the joint of FIG. 1;

FIG. 4 is a sectional view of a packing according to an example of the present invention. DESCRIPTION OF SYMBOLS 1 Joint 10 Joint main body 20 Packing 21 End surface 22 Annular flange 23 Outer peripheral surface 24 Inner peripheral surface 25 Annular lip 26 Space 27 Space 30 Color 40 Bolt 50 Conduit tube

Claims (2)

[Claims] 1. An end face which is in close contact with a step surface formed in a joint body to be mounted, and gradually becomes thinner inward in a diagonal direction in a forward direction with respect to a direction in which the tube is inserted and toward a tip end. And a resilient pipe joint packing having a protruding annular lip. 2. An outwardly projecting annular flange (22) having a flat end surface (21) which is in intimate contact with a step surface formed in a joint body to be mounted, and an annular flange (2).
2) Flange (22) extending substantially horizontally from the lower inside edge of
The space (27) is defined by an outer peripheral surface (23) defining a space (26) by the above and an inner peripheral surface (24) projecting obliquely inward in the oblique radial direction in the forward direction with respect to the tube insertion progress direction. An annular lip (25) having a substantially triangular cross section. The lip (25) reduces the obstruction of the insertion of the tube, and is tightly attached to the surface of the tube by deformation due to pressing.
6, 27) is a packing for a pipe joint, which acts as a relief for a deformed portion when the packing is deformed by being pressed.