JP4036277B2 - Rubber packing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rubber packing used for a telescopic and angleable pipe joint, and in particular, when a pipe connection is made by inserting a pipe opening into a pipe receiving opening, the opening smoothly receives the opening. It is related with the rubber packing suitably used in order to manufacture the pipe joint inserted in this, and the watertightness is also favorable.
[0002]
[Prior art and its problems]
Conventionally, as a rubber packing for a pipe joint used to connect a synthetic resin pipe in an expandable and angular manner, for example, those shown in cross-sectional views in FIGS. 3A and 3B are used.
That is, it is a rubber packing comprising an annular packing body 5 fitted in a packing mounting groove 31 provided on the end face of the receiving pipe 3, and a lip portion 6 having an inclination in the axial center direction on the inner periphery of the packing body.
The packing body 5 is recessed in the shape of a valley 51 at the center in the width direction, and has shoulders 52 and 53 that are angled on both sides, and the outer diameters of both shoulders 52 and 53 are the same. It was the size of.
[0003]
When this conventional rubber packing is mounted in the packing mounting groove 31 of the receiving tube 3 and the insertion tube 4 is inserted into the inner peripheral surface of the lip portion 6 of the rubber packing as shown in FIG. A portion of the valley portion 51 of the packing body provided to reduce the pushing force when the mouth tube 4 is inserted may be deformed, and the packing body 5 may rotate in the direction of the arrow.
Due to the deformation of the packing body due to this rotation, the insertion of the differential tube 4 may not be performed smoothly, and the shoulder portion 53 of the packing body is separated from the inner shoulder portion of the packing mounting groove 31 to make contact. Pressure decreases.
As a result, water tightness is maintained by the shoulder 52 and the inner shoulder of the packing mounting groove 31, and the outer peripheral surface of the differential tube 4 and the inner peripheral surface of the lip portion 6, but this contact pressure is insufficient. As a result, the leakage prevention effect of the fluid flowing in the pipe has also been reduced.
[0004]
[Means for Solving the Problems]
The present invention seeks to provide a rubber packing that solves the above-mentioned problems, the gist of which is from an annular packing body and a lip portion that is folded back from one end of the inner periphery of the annular packing body and inclined in the axial center direction. The outer periphery of the packing body has a trough shape at the center in the width direction, and both sides have mountain-shaped shoulders, and the outer diameter of the shoulder portion located on the folded side of the lip portion is fitted with the packing The outer diameter of the shoulder portion that is substantially the same as the inner diameter of the groove and is located on the tip side of the lip portion is larger than the outer diameter of the shoulder portion that is located on the folded side of the lip portion. Rubber packing.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of the rubber packing of the present invention, and FIG. 2 is a use state diagram of the rubber packing of the present invention.
[0006]
In FIG. 1, reference numeral 1 denotes an annular packing body, and the packing body 1 is mounted in a packing mounting groove 31 provided in the receiving pipe 3.
Reference numeral 2 denotes a lip portion which is folded back from one end of the inner periphery of the packing body 1 and is inclined in the axial center direction. The rubber packing of the present invention is constituted by both the packing body 1 and the lip portion 2.
The outer periphery of the packing body 1 is recessed in the shape of a valley 11 at the center in the width direction, and both sides of the valley 11 have angled shoulders 12 and 13, and the tip of the lip 2 The outer diameter of the shoulder portion 12 located on the side is larger than the outer dimension of the shoulder portion 13 located on the folded side of the lip portion by an H dimension.
The H dimension may be set to about 1 to 2 mm if, for example, hard vinyl chloride tubes having a nominal diameter of 65 are connected.
[0007]
Next, the use state of the rubber packing of the present invention at the time of pipe fitting will be described based on FIGS.
The rubber packing of the present invention is formed such that the outer diameter of the shoulder portion 13 is substantially the same as the inner diameter of the packing mounting groove 31 and the outer diameter of the shoulder portion 12 is slightly larger than the outer diameter of the shoulder portion 13. For this reason, when the annular packing body 1 is fitted into the packing mounting groove 31 provided at the pipe end of the receiving pipe 3, the packing shoulder 12 is slightly connected to one inner surface shoulder of the packing mounting groove 31. The shoulder 13 of the packing is pressed and brought into close contact with the other inner shoulder of the packing mounting groove 31.
[0008]
As shown in FIG. 2, when the insertion tube 4 is inserted into the inner peripheral surface of the lip portion 2 of the rubber packing, the trough portion 11 of the packing body provided to reduce the pushing force when the insertion tube 4 is inserted. The portion is gradually deformed, and the shoulder 12 of the packing body is pressed against the inner shoulder of the packing mounting groove 31 in the direction of the arrow to increase the pressing force.
[0009]
In this state, even if the distal end of the inlet tube 4 is further pushed in, the above-mentioned pressure contact force does not cause the packing body 1 to rotate as in the prior art, and the inlet tube 4 is smoothly applied to the inner peripheral surface of the lip portion 2 of the rubber packing. It is possible to insert only the required dimensions.
The outer peripheral surface of the differential tube 4 and the inner peripheral surface of the lip portion 2 of the rubber packing exert an appropriate pressure contact force in the direction of the arrow so that they are evenly contacted to exert a fluid leakage preventing effect.
[0010]
【The invention's effect】
The rubber packing of the present invention is most suitable as a packing for expansion and contraction and angle-adjustable pipe joints, and can be smoothly inserted when the receiving pipe and the differential pipe are joined, and further interposed in the joint portion of the pipe. Since the inner and outer peripheral surfaces of the rubber packing are in contact with the outer peripheral surface of the differential tube and the inner peripheral surface of the packing mounting groove with a high pressure contact force, when the expansion and contraction of the bonded tubes and the change in the bonding angle occur It has excellent effects such as that the fluid in the pipe does not leak.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a rubber packing according to the present invention.
FIG. 2 is a view showing a usage state of the rubber packing of the present invention.
FIG. 3 is a cross-sectional view and a use state diagram of a conventional packing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical packing main body 11 Valley part 12, 13 Shoulder part 2 Lip part 3 Receptacle pipe 31 Packing installation groove 4 Insertion pipe

Claims (1)

A rubber packing comprising an annular packing body and a lip portion that is folded back from one end of the inner periphery of the annular packing body and is inclined in the axial center direction, and the outer periphery of the packing body is shaped like a valley at the center in the width direction. Both sides have angled shoulders, the outer diameter of the shoulder located on the folded side of the lip is approximately the same as the inner diameter of the packing mounting groove, and the shoulder located on the tip side of the lip A rubber packing characterized in that the outer diameter is larger than the outer diameter of the shoulder portion located on the folded side of the lip portion.

Images