JPH0743060B2 - Pipe mouth structure - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pipe receiving portion into which an insertion portion of a pipe to be connected is inserted when connecting pipes such as drain pipes. Regarding the structure.

(Prior art) When piping such as drain pipes, a packing is installed in a receiving body provided at an end of the pipe, and a pipe to be connected is inserted into the packing so that the pipes are connected to each other. It is known how to connect. In this connection method, for example,
As disclosed in Japanese Examined Patent Publication No. 54-20094, an annular protrusion is provided on the inner peripheral surface of the receptacle main body, and an annular groove is formed on the packing so as to fit the annular protrusion. The ring-shaped groove of the packing is fitted into the ring-shaped protrusion to prevent the packing from moving.

(Problems to be Solved by the Invention) In the pipe receiving portion structure disclosed in the above publication, the packing is strongly crimped to both the receiving body inner peripheral surface and the insertion portion outer peripheral surface to be inserted. The sealability between the two is improved. For this reason, the outer peripheral surface of the insertion portion inserted into the packing is strongly pressed against the inner peripheral surface of the packing, and a large amount of force is required to insert the insertion portion to a predetermined position in the packing. Further, when the annular projection provided on the inner peripheral surface of the receptacle main body is connected to the inner peripheral surface of the receptacle main body by welding, minute irregularities are formed on the inner peripheral surface of the receptacle main body by welding. As a result, the sealing performance of the packing may deteriorate.

The present invention solves the above-mentioned conventional problems, and an object thereof is to easily insert the insertion portion of the pipe to be connected and to have excellent sealing property between the receiving main body portion and the insertion portion. It will provide a mouthpiece structure for the tube.

(Means for Solving the Problem) The pipe receiving portion structure of the present invention is formed in the pipe end portion in a diameter-expanded state, and has a receiving portion having a plurality of inwardly projecting annular projections on its inner peripheral surface. A mouth main body, a cylindrical packing main body in which a gap is formed between the projections and the outer peripheral surface when mounted in the receiving main body, and inserted into the packing main body And a packing having a pressing portion arranged to insert a part of the packing main body into the gap by the insertion opening, thereby achieving the above object.

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

As shown in FIG. 1 (a), the structure of the pipe receiving portion of the present invention is such that the one end portion of the metal pipe 10 is expanded to the main pipe portion 11 excluding the end portion. It has a main body 12 and a packing 20 mounted inside the receptacle main body 12. The socket body
12 is provided with a narrowed portion 12c at the end on the opening side, the diameter of which gradually decreases toward the opening side, and its minimum inner diameter is set to be slightly larger than the outer diameter of the main pipe portion 11 of the metal pipe 10. There is. Two annular projections 12a and 12b, which are recessed inward in a semicircular cross section along the entire circumference of the pipe wall, are arranged in parallel in the pipe axial direction in the middle of the pipe main body 12 in the pipe axial direction. Has been done. The inner rear end portion of the receiving portion 12 is connected to the main portion 11 via a continuous portion 13.

Such a socket body 12 is formed by secondary processing such as bulge processing, spatula processing, and expander processing. When the socket main body 12 is formed by secondary processing, the annular projections 12a and 12b can be formed simultaneously with the molding of the socket main body 12.

The packing 20 mounted in the receptacle main body 12 has a cylindrical packing main body 21. The packing main body 21 has a constant outer diameter capable of being in close contact with the inner peripheral surface of the receptacle main body 12. On the outer peripheral surface of the packing main body 21, there is provided one annular groove 21a into which both annular protrusions 12a and 12b of the main receiving body 12 can be fitted when mounted in the main receiving body. . The annular groove 21a
Has an axial length capable of fitting the two annular projections 12a and 12b. Therefore, when the packing 20 is mounted in the receptacle main body 12, the annular groove 21a of the packing main body 21 is A space is formed between each of the annular projections 12a and 12b of the receiving body portion 12.

The inner peripheral surface of the packing body portion 21 located at the opening side end portion of the receiving body portion 12 when mounted in the receiving body portion 12 has a taper whose diameter increases toward the opening end surface side. It is surface 21b. The taper surface 21b is formed on the packing main body 2
It is continuous with the inner peripheral surface of an annular tongue piece 22 which is provided so as to project from the inner peripheral surface of 1 toward the inner rear side. The annular tongue piece 22 is tapered in diameter toward the tip, and the inner peripheral surface thereof is also tapered. An annular pushing portion 23, which projects outward in a semicircular cross section, is provided at the tip of the annular tongue piece 22 over the entire circumference. The pushing portion 23 is an insertion portion 16 'of the metal tube 10' to be connected to the packing 20 mounted in the receptacle main body portion 12.
When it is inserted, it is pressed outward by the insertion opening 16 'and formed between the annular projections 12a and 12b of the receiving body 12 and the annular groove 21a of the packing body 21. A part of the packing main body 21 is fitted in the space. The packing body portion 21 has an inner rear portion that is fitted in a continuous portion of the receptacle body portion 12 and the main pipe portion 11 when the packing 20 is mounted in the receptacle body portion 12 inwardly. A projecting projection 21b is provided, and the end surface of the projection 21b located inside the packing 20 is aligned with the pipe axis direction so that the end surface of the insertion opening 16 'inserted into the packing 20 is abutted. Are orthogonal.

In the pipe receiving part structure of the present invention having such a configuration, the insertion part 16 'of the metal pipe 10' to be connected in the packing 20 is mounted in the receiving body part 12 with the packing 20 attached. Is inserted. At this time, the annular groove 21a on the outer peripheral surface of the packing body portion 21 of the packing 20 mounted in the receptacle body portion 12 fits the annular protrusions 12a and 12b of the receptacle body portion 12, respectively. 12a
And 12b and the bottom surface of the annular groove 21a form a gap.

When the insertion port 16 ′ is inserted into the packing 20 in such a state, the tip of the insertion port 16 ′ is guided by the tapered surface 21 b of the packing main body 21 to enter the packing main body 21. The ring-shaped tongue piece 22 is inserted, and the diameter of the annular tongue piece 22 is expanded, and the ring-shaped tongue piece 22 is further inserted into the inner depth. When the tip of the insertion opening 16 'passes through the tip opening of the annular tongue piece 22, as shown in FIG.
The pressing part 23 provided at the tip of the 22 is the packing main body part.
21 is pushed into the space between the annular projections 12a and 12b in the socket main body 12. As a result, a part of the packing body 21 is fitted into the space between the annular protrusions 12a and 12b. At this time, the packing main body portion 21 is pulled by the fitted portion and closely adheres along the entire inwardly projecting surface of each of the annular protrusions 12a and 12b having a semicircular cross section, and the receptacle main body portion 12 The entire inner peripheral surface and the entire outer peripheral surface of the packing body 21 are liquid-tightly sealed.

When the tip end surface of the insertion opening 16 'comes into contact with the end surface of the projection 21b in the inner part of the packing 20, the outer peripheral surface of the insertion opening 16', the inner peripheral surface of the packing main body 21 and the inner peripheral surface of the annular tongue 22 are The surface and the surface are tightly adhered to each other, and both are liquid-tightly sealed.

In such a state, even if a force acts on the packing main body 20 to come off from the receptacle main body 12, the entire outer peripheral surface of the packing 20 firmly adheres to the inner peripheral surface of the receptacle main body 12. For,
There is no risk that the packing 20 will fall out of the receptacle main body 12. Moreover, even if a force acts on the insertion opening 16 'in the direction of coming out of the packing 20, the inner peripheral surface of the annular tongue piece 22 of the packing 20 is firmly adhered to the outer peripheral surface of the insertion opening 16'. Spout
There is no risk that 16 'will come off from the packing 20.

In addition, the annular protrusions provided on the socket body 12 are not limited to two rows, and as shown in FIG. 2, three annular protrusions 12a, 12b, and
The configuration may be such that 12c is provided. In this case, in order to fit a part of the packing main body 21 into the two gaps formed by the respective annular protrusions 12a, 12b and 12c and the outer peripheral surface of the packing main body 21, the tip of the annular tongue piece 22 and Two pushing portions 23a and 23b may be provided in the middle.

In addition, between the annular projections 12a and 12b of the socket body 12,
The push-in portion 23 into which a part of the packing main body 21 is fitted is not limited to the configuration provided in the annular tongue piece 22, and as shown in FIG. 3, projects inwardly on the inner peripheral surface of the packing main body 21. You may arrange so. Further, the receiving port main body 12 may be expanded in two stages, and in this case, it is not necessary to provide an inwardly projecting projection at the inner back portion of the packing main body 21.

The socket body 12 is not limited to the structure formed at the end of a metal pipe such as a steel pipe, but may be formed at the end of a cast iron pipe 30 as shown in FIG. In this case, the annular projections 12a and 12b having a rectangular cross section may be attached to the inner peripheral surface of the receptacle main body 12 by welding. Usually, if the annular projections 12a and 12b are attached to the cast iron pipe 30 by welding, the inner peripheral surface in the vicinity of the welded portion is roughened and minute irregularities are formed, so that the liquid tightness with the packing main body portion 21 is deteriorated. However, since a part of the packing main body 21 is pushed between the annular projections 12a and 12b, the outer peripheral surface of the packing main body 21 and the opposing surfaces of the annular projections 12a and 12b are firmly adhered to each other, and Be sure to be liquid tight.

FIG. 5 shows an embodiment in which the socket body 12 is formed at the end of the composite pipe 40 in which the synthetic resin layer 42 is lined on the inner peripheral surface of the metal pipe 41. In this case, when the socket body 12 is formed by rubber bulging at the end of the composite pipe 40,
Each annular protrusion 12a and 12b may be formed simultaneously.

(Effect of the Invention) In the pipe receiving part structure of the present invention, a part of the packing main body is inserted into the packing main body between the plurality of annular projections provided in the receiving main body in this way. Since the structure is such that it is inserted by the pushing part that is pressed outward by the insertion opening, and seals, the outer peripheral surface of the packing main body sticks to the peripheral surface of each annular projection in a pulled state, and the two are securely connected. It is made liquid tight. Further, the insertion opening can be smoothly inserted into the packing main body with a slight force.

[Brief description of drawings]

FIG. 1 (a) is a sectional view showing an example of a pipe receiving portion structure of the present invention, and FIG. 1 (b) is a sectional view showing a state in which an insertion portion is inserted into the receiving portion structure, FIG. 5 to 5 are cross-sectional views of other embodiments of the receiving part of the pipe of the present invention. 10 …… Metal tube, 10 ′ …… Cast iron tube, 10 ″ …… Composite tube, 12 ……
Mouth body, 12a, 12b, 12c …… annular protrusion, 20 …… Packing,
21 …… Packing body, 22 …… Annular tongue, 23 …… Pushing section.

Claims (1)

[Claims] 1. A mouthpiece main body portion having a plurality of annular projections formed on the inner peripheral surface of the pipe end portion in an expanded state, and when mounted in the mouthpiece main body portion. A cylindrical packing body portion in which a space is formed between each of the protrusions and the outer peripheral surface,
And a packing having a pressing portion arranged to insert a part of the packing main body into the gap by an insertion portion inserted into the packing main body, and a pipe receiving portion structure comprising: