JPH0662291U - Tube connection structure - Google Patents

Abstract

(57) [Summary] [Purpose] The object of the present invention is to always provide a good sealability to the pipe connection portion. [Structure] An ordinary packing ring 6 and a water-swellable packing ring 7 are interposed in a connecting portion between a large-diameter pipe body 5 and a small-diameter pipe body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a connecting portion of a pipe body.

[0002]

[Prior art]

 BACKGROUND ART Conventionally, a material which is made water-swellable by mixing a water-absorbing material with rubber has been used for packing rings and the like (for example, Japanese Patent Publication No. 1-12898). The water-swellable packing ring swells upon contact with water and exhibits a strong water-stopping effect.

[0003]

[Problems to be solved by the device]

 However, there is a problem that the water-swellable packing ring contracts when dried and the sealing property is deteriorated.

[0004]

[Means for Solving the Problems]

 As a means for solving the above-mentioned conventional problems, the present invention inserts a small-diameter pipe body (1) into a large-diameter pipe body (5), and the large-diameter pipe body (5) and a small-diameter pipe body (5) It provides a connecting structure for pipes in which a normal packing ring (6) and a water-swellable packing ring (7) are interposed between the structure and (1).

[0005]

[Action]

 The water-swellable packing ring (7) interposed between the large-diameter pipe body (5) and the small-diameter pipe body (1) exerts a strong waterproofing effect by contact with water. When dried, the water-swellable packing ring (7) contracts, but the normal packing ring (6) seals between the large-diameter pipe body (5) and the small-diameter pipe body (1).

[0006]

【Example】

 A first embodiment of the present invention is shown in FIGS. In the figure, (1) is a flexible tube, and the peripheral wall has peaks (2) and valleys (3), and the packing groove (4) is formed on the top surface of the peaks (2). Are formed. The flexible tubes (1) are connected to each other by sockets (5) as shown in FIG. Immediately, the flexible tube (1) is a small-diameter tube body, the socket (5) is a large-diameter tube body, and the flexible tube (1, 1) is inserted from both ends of the socket (5). At this time, at the connecting end of the flexible tube (1,1), install a packing ring (6) made of normal rubber between the ridges (2,2), and insert the packing groove of the ridge (2). Attach a water-swellable packing ring (7) made of rubber mixed with water-absorbent material to (4).

In the above structure, when water enters between the socket (5) and the flexible tubes (1, 1), the water-swellable packing ring (7) swells due to contact with water and becomes strong. It has an excellent water blocking effect, and when it is dry, the flexible tube (1,1) and the socket (5) are sealed by a normal packing ring (6).

FIG. 3 shows a second embodiment of the present invention. In the figure, (11) is a pipe insertion part, which is a small-diameter pipe, (12) is a pipe receiving part, which is a large-diameter pipe, and two packing grooves are provided in the pipe receiving part (12). (13, 14) are provided, and a water-swellable packing ring (15) and a normal packing ring (16) are installed in the packing grooves (13, 14), respectively. When water enters between the pipe insertion part (11) and the pipe reception part (12) with the pipe insertion part (11) inserted in the pipe reception part (12) The water-swellable packing ring (15) swells upon contact with water to exert a strong water blocking effect, and is sealed by the normal packing ring (16) when dried.

FIG. 4 shows a third embodiment of the present invention. In the figure, (21) is a flexible tube in which peaks (22) and valleys (23) are formed on the peripheral wall similarly to the first embodiment, and one connecting end of the flexible tube (21) is A sleeve (25) corresponding to a large-diameter tube is formed. The other connecting end of the other flexible tube (21) is inserted into the sleeve (25) of the flexible tube (21) as a small-diameter tube body, and the ridge portion (22, A normal packing ring (26) is installed between the two, and a water-swellable packing ring (27) is installed in the packing groove (24) of the mountain portion (22).

[0010]

[Effect of device]

 Therefore, in the present invention, the sealing of the connecting portion of the pipe body is completely performed.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention.

FIG. 1 is a sectional side view of a pipe connecting portion.

FIG. 2 is a perspective view of a pipe connecting portion.

FIG. 3 is a sectional side view of a pipe connection portion of a second embodiment.

FIG. 4 is a sectional side view of a pipe connection portion of a third embodiment.

[Explanation of symbols]

 1,21 Flexible tube (small diameter tube) 5 Socket (large diameter tube) 6,16,26 Normal packing ring 7,15,27 Water-swellable packing ring 11 Tube insertion part 12 Tube receiving part 25 sleeves

Claims (1)

[Scope of utility model registration request] 1. A small-diameter pipe body is inserted into a large-diameter pipe body, and a normal packing ring and a water-swellable packing ring are interposed between the large-diameter pipe body and the small-diameter pipe body. Connection structure of pipe body characterized by