JP2009058017A - Expansive pipe joint for piping - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an expansive pipe joint for piping capable of preventing invasion of foreign matter to an inside of the expansive pipe joint from an outside, preventing the foreign matter from damaging a slide part and causing liquid leakage, and carrying out smooth expansion and contraction action. <P>SOLUTION: The expansive pipe joint provided with; a main body 1 provided with a pipe connection part 4 at one side, including a channel 5 at an inside, and including an opening part 6 at another side; a flanged slide part 8 including a channel 7 at an inside and slidably and water-tightly fitted in an inner circumference of the main body 1; a short pipe 2 for sliding set in such a manner that the same can project from the opening part 6 of the main body 1 by slide of the slide part 8 and including a pipe part 10 provided with the pipe connection part 9 at a tip part; and a stopper part 3 arranged at an end surface of the opening part 6 of the main body 1 and fitted in the pipe part 10, is provided with a dust-proof member 11 at an inner circumference part of at least one of the main body 1 and the stopper part 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to expansion pipe joints for piping mainly made of plastic used in various industrial piping lines such as chemical factories, water and sewage systems, agriculture / fishery industries, and food fields. It relates to expansion pipe joints for piping that can prevent the entry of foreign matter into the piping expansion pipe joints, prevent the fluid from leaking due to the sliding parts being damaged by foreign substances, and performing smooth expansion and contraction operations. is there.

Conventionally, an expansion joint as shown in FIG. 6 has been used as a joint that absorbs stress due to expansion and contraction of a pipe line (see, for example, Patent Document 1). The configuration is such that the connection sleeve 112 is inserted from one end of the joint main body 111, and the receiving portion 113 having an outer surface slidable on the inner surface of the joint main body 111 is slightly enlarged in diameter on the outer peripheral surface of the end of the connection sleeve 112. The connection sleeve 112 and the joint main body 111 are sealed by a seal ring 114 that is formed in this manner and attached to the receiving portion 113, and the connection sleeve 112 comes out of the joint main body 111 at one end of the joint main body 111. A cap nut 115 is screwed together, a receiving port 117 is clamped by the cap nut 116 at the other end of the joint body 111, and the joint body 111 and the port are received by a seal ring 118 attached to the end surface of the joint body 111. The pipe 117 is sealed, and the joint main body 111 and the connecting sleeve 112 are slidably in contact with each other. Were those. The effect was that it was possible to prevent the occurrence of creep and prevent the slidability from decreasing.

Japanese Utility Model Publication No. 5-59084

However, the expansion joint has a gap 119 between the connection sleeve 112 and the cap nut 115, and there is a problem that foreign matter enters the joint body 111 from the gap 119. The foreign matter that has entered at this time accumulates on the sliding portion of the joint main body 111 and the connection sleeve 112, so that the connection sleeve 112 becomes difficult to move during expansion and contraction, or malfunction such as sticking may occur. was there. In addition, if foreign matter entering from the gap 119 damages the inner peripheral surface of the joint body 111, the outer peripheral surface of the receiving portion 113 of the connection sleeve 112, or the seal ring 114, there is a possibility that fluid leakage may occur from the damaged portion. It was.

In order to prevent such intrusion and accumulation of foreign matter from the gap 119, a method of periodically cleaning the periphery of the gap 119 or constructing piping with the connection sleeve 112 side (right side in FIG. 6) facing down is considered. It is done. However, there is a problem that the former is troublesome to clean, and there is a risk that some workers may neglect cleaning, and cleaning may not be possible in a narrow installation site. In the latter case, when expansion joints are installed in an environment such as the coast or hot springs, components dissolved in seawater or hot spring water may deposit poorly soluble substances around the expansion joints due to temperature differences. However, there was a problem in that it was not possible to prevent the intrusion and accumulation of precipitates just by facing down, and eventually cleaning was necessary.

The present invention has been made in view of the above-described problems of the prior art, and prevents the entry of foreign matter from the outside into the expansion joint for piping, and also causes fluid leakage due to the sliding portion being damaged by the foreign matter. It is an object of the present invention to provide an expansion joint for pipes that can prevent the occurrence of the occurrence of the failure and can perform a smooth expansion / contraction operation.

The configuration of the present invention will be described with reference to the drawings. A main body 1 having a flow path 5 inside, a pipe connection portion 4 on one side and an opening 6 on the other side, and a flow path 7 inside the main body 1. A flange-like slide portion 8 fitted to the inner periphery so as to be slidable in a watertight state, and an outer diameter smaller than the outer diameter of the slide portion 8, and the opening portion 6 of the main body 1 by sliding of the slide portion 8. The slide short tube 2 having a tube portion 10 which is set so as to be able to protrude from the tube and provided with a tube connection portion 9 at the tip thereof, and the slide portion is disposed on the end surface of the opening 6 of the main body 1. In the expansion joint for piping, which has an inner diameter that is smaller than the outer diameter of 8 and larger than the outer diameter of the pipe portion 10 and is fitted to the pipe portion 10, the main body 1 or the stopper That the dustproof member 11 is provided on at least one of the inner peripheral portions of the portion 3. And butterflies.

The shape of the dust-proof member 11 is a ring shape having an annular lip portion 12 whose tip portion is in sliding contact with the outer peripheral surface of the tube portion 10, and the outer peripheral surface of the tube portion 10 is inclined toward the pipe connecting portion 4 side. A ring-shaped first lip portion 13 that is in sliding contact with the tube, and a ring-shaped second lip portion 14 that is in contact with the outer peripheral surface of the tube portion 10 with the tip portion inclined toward the end surface of the tube connecting portion 9 of the sliding short tube 2. The second feature is that it is either a ring shape or an O-ring shape.

A third feature is that the form of the dustproof member 11 is either an elastic body or a sponge body.

It further comprises a brazed short pipe 16 disposed in a watertight manner on the end face of the pipe connection portion 4 of the main body 1 and cap nuts 17 and 18 screwed to the main body 1, and the stopper portion 3 is formed by the cap nut 17. A fourth feature is that the short tube 16 is fixed to the end surface of the pipe connection portion 4 of the main body 1 by another cap nut 18 and is fixed to the end surface of the opening 6 of the main body 1.

A fifth feature is that the stopper portion 3 is provided integrally with the cap nut 17.

In the present invention, the dust-proof member 11 refers to the entry of foreign matter such as dust, dirt, mud and sand into the inside of the expansion joint for piping (gap between the inner periphery of the main body 1 and the outer periphery of the sliding short tube 2). It is good to provide in the position which can be slid with the pipe part 10 of the short tube 2 for a slide, and is mounted in the opening part 6 side of the inner peripheral part of the stopper part 3, or the main body 1 inner peripheral part.

The material of the dustproof member 11 is mainly ethylene propylene diene terpolymer, but other elastic bodies such as isoprene rubber, styrene butadiene rubber, chloroprene rubber, natural rubber, or polyurethane, polyethylene, rubber, etc. are foamed. A sponge body molded in this manner is also preferably used.

In the present invention, the connection between the pipe connecting portions 9 and 15 of the brazed short pipe 16 and the sliding short pipe 2 and the pipe may be any of socket connection, screw connection, flange connection, butt connection or cap nut connection, It is not limited.

Moreover, you may form a recessed part in the edge part inner periphery or outer periphery of the pipe connection part 9 of the short tube 2 for a slide (not shown). This is preferable because it can be easily expanded and contracted without slipping by using the recess as a clue when the sliding short tube 2 is expanded and contracted during construction. Moreover, you may integrally form either a collar part or a convex part in the outer periphery of the edge part of the pipe connection part 9 (not shown). This is preferable because it is possible to use the collar portion and the convex portion as a clue and to prevent the sliding short tube 2 from being completely accommodated in the main body 1.

Further, in the present invention, the shape of the main body of the expansion / contraction pipe joint for piping may be any of cheese, multi-way joint, elbow, bend, or socket as long as it does not hinder the expansion / contraction operation of the joint.

In the present invention, the material of the main body 1, the sliding short tube 2, the stopper portion 3, the flanged short tube 16, and the cap nuts 17, 18 is made of a polyvinyl chloride resin ( (Hereinafter, referred to as PVC), synthetic resins such as acrylonitrile butadiene styrene copolymer, polyvinylidene fluoride, polypropylene, polyethylene, polystyrene, polytetrafluoroethylene, tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer are preferred. There is no particular limitation.

The present invention has the structure as described above, and the following excellent effects can be obtained.
(1) The dust-proof member can prevent foreign material from entering the inside of the expansion joint for piping, preventing malfunction due to foreign material intrusion and damaging the seal part, preventing fluid leakage and smoothing. Telescopic operation can be maintained.
(2) Since the damage of the seal portion can be prevented, the life of the expansion joint for piping can be extended.
(3) When the lip portion is provided in the dust-proof member, the foreign matter firmly adhered to the outer periphery of the tube portion over time can be removed by scraping out the lip portion.

Hereinafter, although an embodiment of the present invention is described with reference to drawings, it cannot be overemphasized that the present invention is not limited to this embodiment.

FIG. 1 is a longitudinal sectional view showing an expansion pipe joint for piping according to a first embodiment of the present invention. 2 is an enlarged longitudinal sectional view of the main part of FIG. 1, FIG. 3 is an enlarged longitudinal sectional view of the essential part showing an expansion joint for piping according to a second embodiment of the invention, and FIG. 4 is a third embodiment of the invention. It is a principal part expansion longitudinal cross-sectional view which shows the expansion pipe joint for piping which is a form. FIG. 5 is an enlarged vertical cross-sectional view showing a main part of an expansion joint for piping according to a fourth embodiment of the present invention.

Hereinafter, the expansion joint for piping which is 1st embodiment of this invention is demonstrated based on FIG. Reference numeral 1 denotes a hollow cylindrical main body made of PVC, and a flow path 5 is formed therein. One end of the main body 1 is provided with a pipe connecting portion 4 to which a post-printed short tube 16 is connected. A male thread part to which a later-described cap nut 18 is screwed is formed on the outer periphery of the pipe connection part 4, and an annular groove for mounting a seal member is provided on the end face. The other end of the main body 1 is an opening 6, and a slide short tube 2 to be described later is inserted therein.

Reference numeral 2 denotes a PVC short tube for sliding, a tube portion 10 provided so as to be able to protrude from the opening 6 of the main body 1, and an outer periphery provided at one end of the tube portion 10 is substantially the same as the flow path 5 of the main body 1 It has a bowl-shaped slide portion 8 having the same diameter. An annular groove is provided on the outer peripheral surface of the slide portion 8, and a seal ring is mounted on the annular groove, and the slide portion 8 is slidably provided in a watertight state with respect to the inner peripheral surface of the flow path 5 of the main body 1. Yes. With this configuration, the fluid is prevented from entering the gap formed between the inner peripheral surface of the flow path 5 of the main body 1 and the pipe portion 10, and therefore the fluid is prevented from flowing out from the main body opening 6. The other end portion of the tube portion 10 is provided with a tube connection portion 9 to which other piping is connected, and a flow passage communicating with the flow passage 5 of the main body 1 is provided in the slide short tube 2. 7 is provided.

Reference numeral 3 denotes a PVC short tube-shaped stopper, which prevents the sliding short tube 2 from coming out of the main body 1. The inner periphery thereof is smaller than the outer diameter of the slide portion 8 of the sliding short tube 2 and larger than the outer diameter of the tube portion 10, and is stoppered by a cap nut 17 which will be described later and screwed onto the outer periphery of the opening 6 of the main body 1. The flange portion of the portion 3 is clamped and fixed to the end face of the opening 6 of the main body 1. An annular groove is provided on the inner peripheral surface of the stopper portion, and a dustproof member 11 to be described later is attached to the annular groove so as to be in sliding contact with the outer peripheral surface of the tube portion 10 of the sliding short tube 2. Further, in the present embodiment, the stopper portion 3 is provided alone, but may be provided integrally with a cap nut 17 to be described later in order to reduce the number of parts.

Reference numeral 11 denotes a dust-proof member made of a sponge body obtained by foaming polyurethane, and its cross section has a circular shape. In the present embodiment, the dust-proof member 11 is attached only at one place, but the dust-proof member 11 may be attached at a plurality of places in order to enhance the action of the dust-proof member 11.

Reference numeral 16 denotes a PVC short pipe, which is provided with a pipe connecting part 15 to which another pipe is connected at one end, and a flow path having substantially the same diameter as the opening 19 of the main body 1 at the other end. The flange portion of the flanged short tube 16 is clamped and fixed to the end surface of the opening portion 19 of the main body 1 by a cap nut 18 which is provided and screwed to the outer periphery of the pipe connection portion 4 of the main body 1.

Reference numerals 17 and 18 denote PVC cap nuts. One end is provided with a female screw portion that is screwed to a male screw portion provided on the outer periphery of both ends of the main body 1, and the other end portion is provided with the other end portion. An inner collar portion protruding in the inner circumferential direction is provided.

Next, the operation of this embodiment will be described. When a pipe (not shown) connected to the pipe expansion pipe joint expands in the axial direction due to an increase in fluid temperature or temperature, the outer peripheral surface of the slide portion 8 of the slide short pipe 2 is the main body 1. While moving in a watertight manner with the inner peripheral surface of the flow path 5, the pipe 5 moves relatively inward by the thermal expansion of the pipe. Thereby, the stress due to the thermal expansion of the pipe can be absorbed by the pipe expansion joint. At this time, the dust-proof member 11 prevents foreign matter from entering the inside of the main body 1, and the dust-proof member 11 slides on the outer periphery of the tube portion 10 to remove foreign matter attached to the outer periphery of the tube portion 10. The attached foreign matter can be prevented from entering the inside of the main body 1. In contrast to the above, when the pipe contracts due to a decrease in temperature, it acts in the opposite direction to the thermal expansion, and the sliding short pipe 2 moves outward relative to the contraction to expand the pipe expansion pipe joint. The stress due to the contraction of the pipe can be absorbed. At this time, the dust-proof member 11 can prevent foreign matter from entering the main body 1. The expansion / contraction stroke of the expansion pipe joint for piping is the shortest where the end surface of the slide portion 8 of the slide short tube 2 comes into contact with the end surface of the flow path 5 of the main body 1 and the end surface of the slide portion 8 on the tube portion side is the stopper portion. 3 is the longest position.

From the above, the expansion joint for piping according to the present invention prevents the entry of foreign matter from the gap between the sliding short pipe 2 and the stopper portion 3 of the expansion joint for piping by the dustproof member 11, and the dustproof member 11 It has the effect | action which removes the foreign material adhering to the pipe part 10 outer periphery by sliding the pipe part 10 outer periphery. In particular, foreign matter can be prevented from entering the slide portion 8 that slides in a watertight state, and can be suitably used in an installation environment where water or muddy water is scattered frequently or an installation environment where there is a lot of dust and dirt. For this reason, it is possible to prevent malfunction due to the entry of foreign matter and fluid leakage caused by the damage of the seal ring due to the entered foreign matter as in the prior art, thereby extending the life of the expansion joint for piping.

Next, the expansion joint for piping which is 2nd embodiment of this invention is demonstrated based on FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.

Reference numeral 20 denotes a dustproof member made of ethylene propylene diene terpolymer, which has a ring shape having an annular lip portion 12 whose tip portion is inclined toward the end surface of the tube connecting portion 9 of the tube portion 10 and slidably contacts the outer peripheral surface of the tube portion 10. It has become.

Since other configurations and operations of the second embodiment are the same as those of the first embodiment, description thereof is omitted. In the second embodiment, since the lip portion 12 is formed on the dust-proof member 11, in addition to the operation of the first embodiment, foreign matter that adheres firmly to the outer periphery of the tube portion 10 over time is also scraped out. Can be removed.

Next, the expansion joint for piping which is 3rd embodiment of this invention is demonstrated based on FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.

21 is a dustproof member made of ethylene propylene diene terpolymer, the tip of which is inclined toward the pipe connecting part (see the pipe connecting part 4 in FIG. 1) of the main body 1 and is in sliding contact with the outer peripheral surface of the pipe part 10 The first lip portion 13 and the tip end portion are in the shape of a ring having an annular second lip portion 14 that inclines toward the end face of the tube connecting portion 9 of the tube portion 10 and slides on the outer peripheral surface of the tube portion 10.

Since the other configuration and operation of the third embodiment are the same as those of the first embodiment, description thereof is omitted. In the third embodiment, since the second lip portion 14 is formed on the dust-proof member 11, in addition to the operation of the first embodiment, foreign matter that adheres firmly to the outer periphery of the tube portion 10 over time, etc. Can be scraped off. Further, since not only the second lip part 14 but also the first lip part 13 is further formed, it is possible to prevent the foreign matter that could not be removed by the second lip part 14 from entering the main body 1. Even if the two lip portions 14 cannot prevent foreign matter from entering due to scratches or settling, the first lip portion can prevent foreign matter from entering, so that the action of the dust-proof member 11 can be further improved.

Next, the expansion joint for piping which is 4th embodiment of this invention is demonstrated based on FIG. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals.

Reference numeral 22 denotes a main body. An annular groove is provided on the opening 23 side of the inner peripheral surface of the main body 22, and a dustproof member 24 described later is attached to the annular groove. 24 is a dustproof member made of ethylene propylene diene terpolymer, and its cross section has a circular shape. Since the other configuration and operation of the fourth embodiment are the same as those of the first embodiment, description thereof is omitted.

It is a longitudinal cross-sectional view which shows the expansion pipe joint for piping which is 1st embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view of FIG. It is a principal part expanded longitudinal cross-sectional view which shows the expansion pipe joint for piping which is 2nd embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view which shows the expansion pipe joint for piping which is 3rd embodiment of this invention. It is a principal part expanded longitudinal cross-sectional view which shows the expansion-contraction pipe joint for piping which is 4th embodiment of this invention. It is a longitudinal cross-sectional view which shows the conventional expansion joint.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Main body 2 ... Short pipe 3 for a slide 3 ... Stopper part 4 ... Pipe connection part 5 ... Channel 6 ... Opening part 7 ... Channel 8 ... Slide part 9 ... Pipe connection part 10 ... Pipe part 11 ... Dust-proof member 12 ... Lip part 13 ... First lip part 14 ... Second lip part 15 ... Pipe connection part 16 ··· Short tube 17 with flange ··· Cap nut 18 ··· Cap nut 19 ··· Opening portion 20 ··· Dust-proof member 21 ··· Dust-proof member 22 ··· Dust-proof member

Claims (5)

A main body (1) having a flow path (5) inside, a pipe connection part (4) on one side and an opening (6) on the other side, and a flow path (7) inside and having a flow path (7) inside the main body (1) A bowl-shaped slide portion (8) fitted to the periphery so as to be slidable in a watertight state, and an outer diameter smaller than the outer diameter of the slide portion (8), and the main body by sliding of the slide portion (8) A sliding short pipe (2) having a pipe part (10) which is set so as to be protrudeable from the opening (6) of (1) and provided with a pipe connection part (9) at the tip thereof; The pipe (10) is disposed on the end face of the opening (6) of the main body (1), has an inner diameter smaller than the outer diameter of the slide part (8) and larger than the outer diameter of the pipe part (10). ), The expansion pipe joint for piping comprising the stopper portion (3) fitted to the at least one of the main body (1) and the stopper portion (3). Piping expansion joints, characterized in that the inner peripheral portion dustproof member (11) is provided. The shape of the dust-proof member (11) is a ring shape having an annular lip portion (12) whose tip portion is in sliding contact with the outer peripheral surface of the pipe portion (10), and the tip portion is inclined toward the pipe connecting portion (4) side. Then, the annular first lip portion (13) slidably contacting the outer peripheral surface of the tube portion (10) and the tip portion are inclined toward the tube connection portion (9) end surface side of the sliding short tube (2). The expansion pipe joint for piping according to claim 1, which is either a ring shape having an annular second lip portion (14) slidably contacting the outer peripheral surface of 10) or an O ring shape.   The expansion joint for pipes according to claim 1 or 2, wherein the dustproof member (11) is in the form of either an elastic body or a sponge body. A brazed short pipe (16) disposed in a watertight state on the end face of the pipe connection part (4) of the main body (1) and a cap nut (17, 18) screwed to the main body (1) are further provided. The stopper (3) is fixed to the end face of the opening (6) of the main body (1) by a cap nut (17), and the brazed short pipe (16) is fixed to the main body ( The expansion pipe joint for pipes according to any one of claims 1 to 3, wherein the pipe joint part (4) is fixed to an end face of 1). The expansion pipe joint for piping according to claim 4, wherein the stopper (3) is provided integrally with the cap nut (17).

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