JPH0714293U - Corrosion-resistant flexible connecting tube with insulating joint - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent corrosion of pipe joints. [Structure] A flexible tube 1 having a flange portion 12 formed at its tip, a union collar 40 fitted to the tip of the tube and prevented from coming off by the flange portion 12, and a mating tube 9 to be connected to the flexible tube 1. A screw cylinder 6 in which an inner screw 62 and an outer screw 61 for screwing the tips of the
The union collar 40 has an inward flange 42 that hooks on the outward flange 41 of the union collar 40. The union collar 40 and the screw tube 6 are pulled toward the collar portion 12 of the flexible tube 1 by being screwed into the outer screw 61 of the screw tube 6. In the connecting pipe provided with the union nut 5 for tightening, the first and second insulating members 3 and 7 are interposed between the union collar 40 and the flexible pipe 1 and between the screw cylinder 6 and the flexible pipe 1, respectively. ing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a flexible connecting pipe for connecting a branch pipe extending from a main pipe and hot water supply or drainage equipment in a water pipe, a sprinkler pipe, etc. of a building.

[0002]

[Prior art]

 As shown in FIG. 2, a conventional connecting pipe of this type has union joints (8) at both ends of the flexible pipe (1) even if the branch pipe (9) and the pipe (91) on the equipment side are misaligned. By connecting (8) to the mating pipes (9) and (91), the two pipes (9) and (91) are connected without any trouble.

A flange portion (12) for preventing the union joint from being pulled out is formed at the tip of the flexible tube (1). The union joint (8) includes a flexible tube (1), a union collar (40) fitted to the tip of the flexible tube and secured by a collar portion (12), and the flexible tube (1). Screw tube (6) screwed to the tip of the mating pipe (9) to be connected to the outer pipe (6) and the inward flange (42) hooked on the outward flange (41) of the union collar (40). ) And a union nut (5) screwed into the outer screw (61) of the screw cylinder (6). The packing (34) is provided between the flange portion (12) and the end face of the screw cylinder (6). ) Is installed. The flexible tube (1) is a bellows tube made of stainless steel, and the outer side thereof is covered with a blade (16) made of stainless steel.

[0004]

[Problems to be solved by the device]

 Generally, the union joint (8) is made of cast iron, and the collar portion (12) and blade (16) of the flexible tube (1) made of stainless steel are directly contacted with the union collar (40) of the union joint (8). To do. The branch pipe (9) and the flexible pipe (1) are electrically connected to each other via the union joint (8), and therefore the contact portion between the union collar (40) and the flexible pipe (1). Electrolytic corrosion occurs at the union joint (8), causing a problem of early corrosion and shortening the service life. In the case of hot water supply equipment, corrosion of joints is particularly significant. The present invention discloses a corrosion-resistant flexible connecting pipe having an insulating joint, which can solve the above-mentioned problem of electrolytic corrosion by imparting insulating properties to the joint.

[0005]

[Means for solving the problem]

 A flexible connecting pipe having an insulating joint according to the present invention is provided with a flexible pipe (1) having a flange portion (12) formed at its tip, and is fitted at the tip of the pipe so as to be prevented from coming off by the flange portion (12). The union collar (40) and the screw tube (6) formed with the inner screw (62) and the outer screw (61) for screwing the tips of the mating pipe (9) to be connected to the flexible pipe (1). , Having an inward flange (42) hooked to the outward flange (41) of the union collar (40), and screwed into the outer screw (61) of the screw tube (6) to form the union collar (40) and the screw tube. In a connecting pipe provided with a union nut (5) for pulling (6) to the collar portion (12) of the flexible tube (1) and tightening it, the union collar (40) and the flexible tube (1) are joined together. The first and second insulating members (3) and (7) are respectively interposed between the screw tube (6) and the flexible tube (1).

[0006]

[Action and effect]

 The first and second insulating members (3) and (7) are interposed between the union collar (40) and the flexible tube (1) and between the screw tube (6) and the flexible tube (1), respectively. Since the flexible tube (1) and the union collar (40) are insulated from each other and the flexible tube (1) and the screw tube (6) are insulated from each other, the flexible tube (1) and the union collar (6) are insulated from each other. (40) Even if the flexible tube (1) and the screw tube (6) are made of different metals, no electrolytic corrosion occurs and it is possible to prevent shortening of life due to corrosion in the vicinity of the joint.

[0007]

【Example】

 FIG. 1 shows a state in which a branch pipe (9) of a building pipe and a pipe (91) on the water supply facility side are connected by a flexible pipe (1) equipped with an insulating joint (4). The flexible tube (1) is a bellows tube made of stainless steel and covered with a blade (16) made of stainless steel.

The insulation joint (4) includes a union collar (40) attached to the flexible tube (1), a screw tube (6) screwed into the mating tube (9), and the union collar (40) and the screw tube ( Between the union nut (5) that tightens 6), the union collar (40) and the first insulating member (3) that insulates the flexible tube (1), the screw tube (6) and the flexible tube (1). And a second insulating member (7) for insulating the. One end of the flexible tube (1) is a straight pipe part (11) in which a bellows is extended in a cylindrical shape, a flange part (12) is connected to the front end part of the straight pipe part (11), and the flange part (12) is continuous. To form a short tube (14).

A receiving ring (2) is fitted on the bellows side of the straight pipe part (11), and the end of the blade (16) is covered on the receiving ring (2), and the end of the blade (16) is covered. The part is tightened by tightening the tightening ring (21). The union collar (40) of the insulating joint (4) and the first insulating member (3) are attached to the straight pipe portion (11) from the collar portion (12) to the tip side of the blade (16).

The first insulating member (3) of the embodiment includes a ring-shaped core body (32) made of resin directly fitted in the straight pipe part (11) of the flexible pipe (1) and a tightening ring (21). ) And a tubular cover body (31) made of resin that covers the tip of the blade (16) from above, the core body (32) and the cover body (31) may be integrally formed. It is possible.

The cover body (31) of the embodiment is made of heat-shrinkable resin and is in close contact with the tightening ring (21) and the blade (16) by heat shrinkage, and the tip is shrunk to receive the receiving ring (2). ) Is covered on the end face. The front ends of the collar portion (12) and the cover body (31) are in contact with both surfaces of the core body (32). A peripheral groove (33) is formed on the outer periphery of the core body (32).

The cast iron union collar (40) of the insulating joint (4) is fitted on the first insulating member (3). The union collar (40) has an outward flange (41) and an inward flange (42) protruding from the front end of the collar (12), and the inward flange (42) is a circumferential groove of the core body (32). It fits tightly in (33). In the embodiment, the core body (32) is integrally molded with the union collar (40) by resin outsert molding.

The collar portion (12) at the tip of the flexible tube (1) has a receiving ring (2), a tightening ring (21), a cover body (31) and an extension portion () on the straight pipe portion (11). The union collar (40) fitted with 11) and the core body (32) is fitted and then molded.

The branch pipe (9) to be connected to the flexible pipe (1) has a resin lining layer (90) formed on the inner surface, and the screw cylinder (6) of the insulating joint (4) is screwed into the branch pipe (9). There is. The screw cylinder (6) has an inner screw (62) for screwing the pipe (9) on one end, an outer screw (61) on the outer end, and a ridge (63) on the outer screw (61) side. ing. A second insulating member (7) for insulating between the screw cylinder (6) and the tip of the flexible tube (1) is attached to the screw cylinder (6).

The second insulating member (7) of the embodiment includes a resin annular plate (71) fitted in the short tube (14) at the tip of the flexible tube (1), and a screw tube (6). Although it is configured by the resin core body (72) fitted to the inner surface of the, the annular plate (71) and the core body (72) can be integrally formed. The annular plate (71) is formed to be slightly larger than the inner diameter of the flexible tube (1) and is in contact with the flange portion (12) of the flexible tube (1) and the end surface of the screw tube (6).

A peripheral groove (73) is formed on the outer periphery of the core body (72), and a ridge (63) of the screw cylinder (6) is tightly fitted to the core body (72). It is in contact with the annular plate (71). At the rear end of the core body (72), a short cylinder (74) having a small diameter is projected, and the tip of the pipe (9) is fitted between the screw cylinder (6) and the short cylinder (74). In the embodiment, the core body (72) and the short cylinder (74) are formed integrally with the screw cylinder (6) by resin outsert molding.

A union nut (5) is attached across the union collar (40) and the screw tube (6). The union nut (5) has an inward flange (51) that hooks on the outward flange (41) of the union collar (40) and an internal screw (52) that engages with the external screw (61) of the screw tube (6). ) And by tightening the union nut (5), the union collar (40) and the screw tube (6) are pulled together and connected by sandwiching the collar section (12) of the flexible tube (1). To do. The other end of the flexible tube (1) is connected to the equipment-side tube (91) through the same insulating joint (4) as described above.

However, between the union collar (40) and the flexible tube (1), and between the screw tube (6) and the flexible tube (1), the first and second insulating members (3) ( The flexible tube (1) and the union collar (40) and the flexible tube (1) and the tube (9) to be connected to the flexible tube (1) can be insulated by interposing the flexible tube (1). ), The union collar (40), the flexible tube (1) and the screw tube (6) are made of different metals, no electrolytic corrosion occurs and the service life near the joint can be shortened.

In the embodiment, the insulating joints (4) are provided at both ends of the flexible tube (1), but it is also possible that only one of them is an insulating joint and the other is not insulated. Further, the flexible connecting pipe of the present invention can be applied not only to water pipes but also to sprinkler pipes, pipes for passing electric cables, and the like. The present invention is not limited to the configuration of the above embodiment, and various modifications can be made within the scope of the claims for utility model registration.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a joint of the present invention.

FIG. 2 is a sectional view of a main part of a conventional joint.

[Explanation of symbols]

 (1) Flexible tube (12) Collar part (3) First insulation member (4) Insulation joint (40) Union collar (5) Union nut (7) Second insulation member

Claims (1)

[Scope of utility model registration request] 1. A flexible tube (1) having a collar portion (12) formed at its tip.
And the inner end of the mating pipe (9) to be connected to the flexible pipe (1) is screwed into the union collar (40) fitted to the distal end of the pipe and secured by the collar portion (12). Screw (62) and external screw (61)
And a screw cylinder (6) formed with an inward flange (42) hooked on the outward flange (41) of the union collar (40) and screwed to the outer screw (61) of the screw cylinder (6). Union color (4
(0) and the threaded tube (6) are pulled together to the collar section (12) of the flexible tube (1), and a union nut (5) for tightening the union collar (40) and the flexible tube (1). ), And between the screw tube (6) and the flexible tube (1), the first and second insulating members (3) and (7), respectively.
Corrosion-resistant flexible connecting pipe with an insulating joint intervening.