JP2007146992A - Branch fitting, snow melting sprinkler pipe unit amd snow melting panel unit using this branch fitting, and resin pipe connection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a branch fitting capable of absorbing extension and contraction of a resin pipe in accordance with changes of temperature, while maintaining connection with the resin pipe stably, and ensuring strength of a branch pipe for connecting an external device or a branched pipe. <P>SOLUTION: A collar part 22a formed on the branch pipe 22 is locked into an inner face of a flow passage hole of a fitting main body 11 to protrude a cylindrical part 22b of the branch pipe 22 from an outer face, and a part in the vicinity of a through hole 11a of the fitting main body 11 is nipped and held by a fixing device 23 mounted annularly in the cylindrical part 22b and the collar part 22a to fix the branch pipe 22. In addition, a packing 11g is annularly mounted between an inclined face 11f formed in such a way that its diameter is gradually expanded toward the outside and the resin pipe B in an end part of the flow passage hole 11d so as to protrude outward and partially from the end part, and this packing 11g is pressed toward the inside by a pressing member 11h to connect the resin pipe B. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a branch joint for connecting and connecting resin pipes at the same time as branching, a snow extinguishing sprinkler piping unit and a snow extinguishing panel unit using the branch joint, and a resin pipe connecting method in the branch joint.

  In order to branch a branch pipe from a pipe (main pipe) for flowing a fluid, a branch pipe can be connected to this branch connection portion by using a so-called branch joint that can branch at the same time as connecting the pipes together. In general, a device such as a water faucet is arranged in the middle of the pipe, and a branch pipe is connected to this.

  As the former branch joint, for example, there is a branch joint already proposed by the present applicant. This branch joint has a housing in which at least one opening is provided on the outer peripheral surface, a branch pipe connection socket is joined to the opening, and an elastic seal member having a hollow protrusion at a position corresponding to the branch pipe connection socket. The elastic seal member covers the inner circumference of the flow path in the longitudinal direction of the housing, and is inserted into the housing by inserting the hollow protrusion into the branch pipe connection socket, and has one end in the axial direction of the housing. Is a fixed end provided with a grip ring for preventing the connected pipe from coming off, and the other end is a free end provided with only a lip packing (see, for example, Patent Document 1).

The latter water faucet has, for example, a resin saddle having a joining surface curved with a predetermined curvature, and a heat generating element for fusing provided on the inner surface thereof, and is provided so as to protrude from the central portion of the resin saddle. And a short pipe portion having an external thread on the outer peripheral surface, a main body having one end fitted to the inner peripheral surface of the short pipe portion, and formed on the outer peripheral surface of the main body and locked to the end surface of the short pipe portion. And a metal adapter having a hook.
The water faucet configured in this way melts and fixes the outer peripheral surface of the main pipe and the inner surface of the resin saddle by heating the heating element, and then inserts a perforating jig from the top of the water faucet. A hole is drilled in the pipe wall of the main pipe so that the main pipe communicates with the branch pipe (see, for example, Patent Document 2).

Japanese Patent Laying-Open No. 2005-155705 (first page, FIG. 2) Japanese Patent No. 3634216 (3rd, 4th page, FIG. 1)

  By the way, although the above-mentioned branch joint is used for various piping systems, for example, it is also used for a snow extinguishing system for removing snow falling on a track on a railway line in a cold district.

  This snow-melting system includes a sprinkler watering method and a snow-dissipating panel unit type that uses a heat-dissipating plate using water as a heat medium and melts snow falling on the heat-dissipating plate. For example, in the former sprinkler watering method, a plurality of 5 to 6 m steel pipes are connected in a straight line through the branch joint along the track, and a sprinkler head is connected to the branch portion of each branch joint. ing.

  Therefore, since the piping is made of metal as described above, the entire weight becomes heavy. As a result, it is necessary to attach a corresponding support member that supports the entire weight in the middle of the branch joint and the steel pipe. The problem which should be improved in workability has arisen. However, in order to solve such a problem, using a resin tube seems to solve it at first glance. However, however, there are the following problems, and the resin tube cannot be simply adopted.

First of all, although the conventional branch joint described above is suitable with a fastening mechanism for tightening a steel pipe with bolts and nuts in an extendable manner, it is a fastening mechanism with bolts and nuts. It is. The resin pipe has a coefficient of thermal expansion that is an order of magnitude greater than that of the steel pipe (steel pipe: 1.2 × 10 ⁻⁵ / ° C., resin pipe: 1.3 × 10 ⁻⁴ / ° C.). It was not easy to balance the expansion / contraction due to and the fastening force with adhesion. That is, if the amount of expansion / contraction increases by an order of magnitude, it can be considered that the fastening force is adversely affected and the sealing performance is deteriorated as a result.

  Even if the latter faucet is adopted, this faucet is not designed to absorb the expansion and contraction of the tube, and each component other than the metal adapter is made of resin. Therefore, if the sprinkler head in which the nozzle rotates is connected to the short tube portion, it can be easily estimated that the short tube portion is damaged by the rotational moment acting on the short tube portion, and it cannot be adopted.

  As described above, the latter water faucet is heated and melted and fixed to the outer peripheral surface of the main pipe, and then a drilling jig is inserted from the upper part of the water faucet to make a hole in the main pipe wall. Since it is drilled to communicate from the main pipe to the branch pipe, it takes time and labor separately from the connection work between the pipes. In particular, when constructing a snow extinguishing system on railway lines, there are often cases where construction must be completed in a very short period of time, and it is desirable to reduce field work as much as possible. In this respect, the latter water faucet is inconvenient for easily dealing with such a case.

  Therefore, the present invention has been made in view of such a situation, the weight of the piping unit can be reduced, the piping construction work at the site is reduced, and further, the expansion of the resin pipe is absorbed and the main pipe connection portion is absorbed. An object of the present invention is to provide a branch joint capable of improving the joint strength and the strength of the branch connection portion, a snow-sprinkler sprinkler piping unit and a snow-breaking panel unit using the branch joint, and a resin pipe connection method.

In order to achieve the above technical problem, the branch joint according to the present invention, the snow-sprinkling sprinkler piping unit and the snow-fusing panel unit using the branch joint, and the resin pipe connecting method employ the following technical means.
That is, the branch joint according to claim 1 is a branch joint including a joint main body provided with a flow passage hole for connecting resin pipes and connecting the resin pipes, and a branch portion for branching the flow path to the outside. The branch portion is locked to the inner surface of the channel hole, and a cylindrical portion that is inserted into a through hole that connects the channel hole and the outer surface of the joint body so as to protrude from the outer surface. A branch pipe provided with a flange portion, and a fixture that is mounted on the cylindrical portion protruding from the outer surface of the joint body, and fixes the branch pipe by sandwiching the joint body with the flange portion. And a sealing means for sealing the through hole and the branch pipe, and the flow path hole is formed with a main pipe connecting portion for connecting the resin pipe at an end thereof. A packing wrapped between the inserted resin pipe and the main pipe connection portion; The packing in the inwardly mechanical connecting part comprising a pressing member for pressing, characterized by comprising the resin pipe is an axial movable connected.

  According to the technical means of the first aspect, the flange portion formed on the branch pipe is connected to the joint body provided with the flow path hole connecting the resin pipes and the through hole communicating with the flow path hole and the outer surface. The tube part of the branch pipe is projected from the outer surface by locking to the inner surface of the passage hole, and the branch pipe is formed by sandwiching the inner surface and the outer surface near the through hole of the joint body with the fixture and the collar part that are wrapped around the tube part. Fix it. The flange portion of the branch pipe has a structure in which the joint body is clamped and fixed by a fixture. Here, since the collar part is locked along the inner peripheral curved surface around the through hole, the collar part itself cannot be rotated in the forward and reverse directions, and receives a rotational moment at the collar part. The strength is improved without being damaged or the branch pipe itself rotating. Further, the through hole and the branch pipe are sealed with a sealing means. Further, the main pipe connecting portion is a mechanical connecting portion for connecting the resin pipe so as to be movable in the axial direction, and the fastening force is maintained while absorbing expansion and contraction of the resin pipe.

  A branch joint according to a second aspect of the present invention is the branch joint according to the first aspect, wherein the end portion of the flow path hole is formed in an inclined surface that gradually increases in diameter outward, and between the inclined surface and the resin pipe. The packing is wrapped around.

  According to the technical means of the second aspect, the packing is provided between the end portion of the flow path hole formed on the inclined surface that gradually increases in diameter toward the outside and the resin tube, and the pressing member is used. By pressing inward, a pressing force is applied to the inner side of the joint body and the outer peripheral surface of the resin tube, and the end of the flow path hole and the resin tube are sealed.

  A branch joint according to a third aspect of the present invention is the branch joint according to the first or second aspect, wherein the pressing member is formed in a frame shape that abuts against a partly projecting end surface of the packing, and the joint main body is the resin The tube is formed so as to be connected in a straight line, and is provided with a tie rod that is engaged with the pressing members facing each other and expands and contracts the distance between the pressing members.

  According to the technical means concerning Claim 3, with the tie rod which expands / contracts the separation distance of pressing members, the opposing pressing members are pressed inwardly, the both ends of a flow-path hole, and both resin pipes Are sealed simultaneously with both packings.

  A branch joint according to a fourth aspect of the present invention is the branch joint according to any one of the first to third aspects, wherein the sealing means gradually reduces the diameter of the corner portion inside the bottom surface of the fixture facing the outer surface of the joint body upward. A sealing member formed in the shape of a hollow truncated cone along the inclined surface is provided around the corner portion of the inclined surface, and the sealing member includes the sealing member. The outer peripheral surface of the cylindrical portion protruding from the outer surface of the joint body and the outer surface of the joint body are sealed.

  According to the technical means concerning Claim 4, it forms in the shape of a hollow truncated cone along the inclined surface in the corner part inside the bottom face of the fixture formed in the inclined surface shape gradually reduced in diameter upward. The seal member is mounted, and the seal member is pressed by the inclined surface of the fixture, so that the pressing force is divided between the outer peripheral surface of the cylindrical portion and the outer surface of the joint body, and the outer peripheral surface of the cylindrical portion and the joint main body are At the same time, the outer surface is hermetically sealed. Further, according to the frustoconical seal member, the outer peripheral surface of the cylindrical portion protruding from the outer surface of the joint body can be supported, so that the strength is further stabilized.

  A branch joint according to a fifth aspect of the present invention is the branch joint according to any one of the first to third aspects, wherein the sealing means interposes a spacer member extending between the bottom surface of the fixture and the outer surface of the joint body. An O-ring is provided around the bottom surface of the fixture and the bottom surface of the spacer member.

  According to the technical means of the fifth aspect, as another aspect of the sealing means, for example, when the joint body is formed of a tubular body, the outer peripheral curved surface can be used as it is. That is, a spacer member having a bottom surface along the curved surface is interposed between the bottom surface of the fixture and the outer surface of the joint body to ensure surface contact, and in addition, the bottom surface of the fixture and the spacer member Sealing can be improved by mounting an O-ring on the bottom.

  A branch joint according to a sixth aspect of the present invention is the branch joint according to any one of the first to fifth aspects, wherein the joint body is made of a thermoplastic resin, the branch pipe and the fixture are made of metal, and the branch pipe Is extended in a direction orthogonal or substantially orthogonal to the resin tube.

  According to the technical means of claim 6, the joint body is made of a thermoplastic resin to reduce the weight, and the branch pipe and the fixture are made of metal to improve the strength.

  A branch joint according to a seventh aspect of the present invention is the branch joint according to any one of the first to sixth aspects, wherein the fixture is screwed to an upper portion of the cylindrical portion, and an external device or a branch pipe is connected to the cylindrical portion or the fixture. It is characterized by having a branch connection part for connecting the two.

  According to the technical means concerning Claim 7, an external apparatus or a branch pipe can be directly connected to the branch connection part with which the cylinder part or the fixture was equipped, and a weight and height can be reduced.

  A branch joint according to an eighth aspect of the present invention is the branch joint according to the seventh aspect, wherein the branch connection portion is configured to be connectable to a sprinkler head, and the fixture includes a loosening prevention means for preventing looseness with the cylindrical portion. The loosening prevention means includes a locking pin fitted or screwed into the screwed portion between the fixing tool and the cylindrical portion from the outside, and / or the rotation direction of the sprinkler head and the screwed portion. The screwing direction is the same as the rotation direction of the sprinkler head.

  According to the technical means of claim 8, by providing a loosening prevention means on the fixture, even if a sprinkler head which is an external device having a rotating part is connected to the branch connection part, the connection part is prevented from loosening. To do.

  The snow-sprinkling sprinkler piping unit according to claim 9 is connected to the branch joint according to claim 7 or 8, the sprinkler head connected to the branch connection portion and sprinkling water while rotating, and the main pipe connection portion. And a composite resin tube having a tubular metal plate with a plurality of openings provided in the wall thickness of the tube body, the outer peripheral surface of which is made of a thermoplastic resin. It is characterized by being piped so that it can be snow-melted.

  A snow removal panel unit according to claim 10 is a snow removal panel unit using the branch joint according to claim 7, and is disposed on a heat radiating plate having a snow receiving surface on a surface thereof and on a back surface of the heat radiating plate. A snow-melting panel comprising a heat radiating pipe for flowing a heat medium; a plurality of water-feed pipes connected to the main pipe connecting portion and sending the heat medium sent from a supply source to the snow-dissipating panel; A plurality of return water pipes connected to the main pipe connection section for returning the heat medium discharged from the snow-melting panel to a supply source, one end is connected to an inlet of the heat radiating pipe, and the other end is connected to the feed pipe. A first connecting pipe connected to the branch connecting portion of the branch joint connected to a water pipe, and one end of the branch joint connected to the outlet of the heat radiating pipe and the other end connected to the return pipe. A second connecting pipe connected to the branch connection portion; And butterflies.

  According to the technical means according to claim 9 or 10, the above-mentioned branch joint is used to construct a snow extinguishing sprinkler piping unit or a snow extinguishing panel unit, thereby reducing the overall weight and fastening. Responds to expansion and contraction of the resin tube while maintaining the force.

  In the resin pipe connecting method according to claim 11, the branch pipe is inserted so as to protrude from the outer surface into a through hole that connects the flow passage hole connecting the resin pipes formed in the joint body and the outer surface of the joint body. And a resin pipe connection method in a branch joint that supports the branch pipe by locking the branch pipe to the inner surface of the through hole and sandwiching the inner surface and the outer surface of the edge of the through hole with a metal member. A packing is provided between the resin tube inserted into the end of the flow path hole and the inner surface of the end so as to partially protrude outward from the end, and the packing is directed inward. The resin tube is connected so as to be movable in the axial direction by continuously pressing.

  According to the present invention, compared with the above-described water faucet in which the clamp part and the short pipe part are integrally formed of resin, the configuration of the parts is simple and the strength of the cylindrical part (corresponding to the short pipe part) is increased. Easy to do. Even if the branch pipe is made of resin and the cylinder part is damaged by the rotational moment acting on the cylinder part, it is only necessary to replace the branch pipe without replacing the entire joint. Can be improved.

  In addition, by providing a mechanical structure connection using packing, even if a resin tube with a large degree of expansion and contraction due to changes in temperature is connected, the expansion and contraction can be easily absorbed while maintaining the fastening force. It is possible to prevent the tube from being bent or damaged.

  In addition to the above effects, the overall weight can be reduced by constructing a snow extinguishing sprinkler piping unit using the above-mentioned branch joint and resin pipe, or by using a snow extinguishing panel unit. As a result, the number of supporting members that support the structure can be greatly reduced, and the workability and economy can be improved.

  Next, an embodiment of a branch joint according to the present invention, a snow-melting sprinkler piping unit and a snow-breaking panel unit using the branch joint will be described. 1 to 8 show a branch joint according to the present embodiment, FIGS. 1 to 4 show the first embodiment, FIGS. 5 and 6 show the second embodiment, and FIG. 7 shows the third embodiment. FIG. 8 shows the fourth embodiment. Further, FIG. 9 shows a snow-melting sprinkler piping unit according to this embodiment, and FIG. 10 shows a snow-melting panel unit according to this embodiment.

(Embodiment 1)
As shown in FIGS. 1 and 2, the branch joint A according to the first embodiment includes a joint body 11 and a branch portion 21.

As shown in FIG. 1, the joint body 11 has a through-hole 11a drilled in the middle part of a round pipe-like straight pipe having a required length made of a thermoplastic resin such as polyethylene, and both ends of a channel hole 11d. An inclined surface 11f is formed so that the diameter of the portion gradually increases outward. On this inclined surface 11f, a packing 11g is mounted, and a mechanical connecting portion 11e for connecting the resin tube B by pressing the packing 11g with a pressing member 11h is disposed. Detailed description of the mechanical connection portion 11e will be described later.
In addition, the whole inside of the pipe | tube connected is the flow path hole 11d, and the branch pipe 22 mentioned later becomes the main pipe connection part 11c to which the flow path hole 11d part except the arrangement | positioning position of the collar part 22a connects the resin pipe B. Yes.

  The branch portion 21 includes a branch pipe 22, a fixture 23, and a sealing means 24.

  The branch pipe 22 is vertically erected from the center of the flange portion 22a and a substantially rectangular flange portion 22a formed by convexly bending a metal plate member along the inner peripheral surface of the flow path hole 11d. The cylindrical portion 22b made of a hollow metal pipe having a required length is integrally formed so as to communicate with each other. It is made of a metal that does not easily rust, such as stainless steel, brass, or bronze, and can be integrally formed by welding the two together or by forging. Further, the cylindrical portion 22b is formed with a male screw 22c to be screwed with a fixture 23 to be described later from the midway portion to the front portion, and an O-ring to be in close contact with the inside of the through hole 11a between the midway portion and the base portion. 4 is ringed.

  The branch pipe 22 formed in this way is inserted and assembled from the end opening of the joint main body 11, but the through hole 11 a that connects the flow path hole 11 d and the outer surface of the joint main body 11 to the through hole 11 a. The cylindrical portion 22b is inserted and protruded so as to protrude from the outer surface, and the curved surface shape along the inner peripheral surface of the flow path hole 11d is brought into contact with the hook portion 22a, which is substantially rectangular in plan view, and locked to the inner surface. It is arranged so that.

  In this branch pipe 22, since the flange portion 22 a is locked to the inner peripheral surface of the flow path hole 11 d so as not to rotate forward and backward, the branch pipe 22 can be stably placed upright, and rotational force and vibration It has a strong structure against external forces.

  The locking structure incapable of forward / reverse rotation is not limited to the shape of the flange portion along the inner peripheral surface described above. For example, a concave portion that matches the shape of the flange portion is provided on the inner peripheral surface, and the flange portion is provided on this. It can be configured to be fitted, or a locking member such as a pin can be separately provided so as not to rotate.

  Further, a plurality of convex portions (preferably sharpened) may be provided on the collar portion so as to bite into the inner peripheral surface of the flow path hole 11d. That is, the flange portion 22a is not particularly limited as long as the flange portion 22a is locked to the inner peripheral surface of the flow path hole 11d so as not to rotate forward and backward.

  The fixing tool 23 is a substantially ring-shaped metal member, and a female screw 23b that engages with a male screw 22c formed in the cylindrical portion 22b is formed on the inner peripheral surface from the middle portion to the lower portion, and the other A branch connection portion 23a made of a female screw for connecting an external device or a branch pipe is formed on the inner peripheral surface extending from the midway portion to the upper portion. The material is not particularly limited, but it is desirable that the material is rust-resistant metal such as stainless steel, brass or bronze.

  And this fixing tool 23 is screwed and screwed into a male screw formed in the cylindrical portion 22b through a sealing means 24 described later, and the edge of the through hole 11a is sandwiched between the flange portion 22a and the fixing tool 23. By doing so, the branch pipe 22 is erected and supported in a direction orthogonal to the resin pipe B. The branch connection portion 23a is appropriately formed according to the external device or the branch pipe to be connected, and is not limited to the female screw.

  Further, the fixture 23 includes a loosening prevention means for preventing loosening of the screwing with the cylindrical portion 22b. This loosening prevention means is formed by fitting a locking pin 5 from the outside into a screwed portion between the fixture 23 and the cylindrical portion 22b. The locking pin 5 can completely prevent loosening of the fixing member 23 and the cylindrical portion 22b when the cylindrical portion 22b is penetrated, but on the other hand, there is a possibility that the fluid leaks to the outside. It is preferable to bite into the outer peripheral surface (male screw portion) of the portion 22b. There is no restriction on the position and number of the locking pins 5, and the locking pins 5 may be not only driven in but also screwed into a fixing tool using a so-called set screw to be bitten into the cylindrical portion 22 b.

  Further, when the external device to be connected to the branch connection portion 23a made of a female screw is, for example, a sprinkler head in which the nozzle rotates, the rotation direction of the nozzle and the screwing portion are used in combination with the loosening prevention means by the locking pin 5. By making the direction of screwing the same, the loosening of the fixture 23 and the cylindrical portion 22b can be completely prevented.

  The sealing means 24 is mounted on the annular spacer member 24a having a planar upper surface facing the bottom surface of the fixture 23, and a curved bottom surface along the outer surface of the joint body 11, and the bottom surface of the spacer member 24a. The O-ring 4 and the O-ring 4 mounted on the bottom surface of the fixture 23 are provided, and these members are interposed between the outer surface of the joint body 11 and the bottom surface of the fixture 23 to branch from the through hole 11a. The pipe 22 is sealed.

  As described above, the mechanical connection portion 11e includes the inclined surface 11f formed so as to gradually increase in diameter toward the outer end at the end portion of the flow path hole 11d, and the resin tube B inserted into the main tube connection portion 11c. The packing 11g formed in the shape of a hollow truncated cone along the inclined surface 11f is mounted so as to partially protrude outward from the end portion. It is pressed by the pressing member 11h.

  The pressing member 11h is a substantially rectangular frame-shaped member in which a hole portion through which the resin tube B can be inserted is formed, and is substantially U-shaped in a vertical cross-sectional view. Locking holes 11k are formed at four corners of the pressing member 11h. Is provided.

  And this press member 11h is arrange | positioned so that the side wall which protruded in the both ends of the coupling main body 11 in the longitudinal cross-section view may be turned inside, and the hole edge part of both press members 11h It is in contact with both packings 11g.

  Further, a tie rod 11m having a flange-shaped head formed between opposing locking holes 11k is inserted from one pressing member 11h, and a tip portion of the tie rod 11m protruding from the other pressing member 11h is a nut 11n. When the nut 11n is screwed, the distance between the opposing pressing members 11h is expanded and contracted. It is preferable that a spring washer-like adjusting member is interposed in the nut 11n. Thereby, relaxation of the tightening amount due to expansion and contraction can be absorbed.

  Here, the structure of the above-described resin tube B will be described. As shown in FIGS. 1 to 3, the above-described resin tube B is formed by using a tubular metal plate b1 provided with a plurality of opening holes b2 from a thermoplastic resin. This is a composite resin pipe that is integrated by interposing inside the wall thickness of the pipe body b3, and can be fused with the main pipe connecting portion 11c by electric heating, and at the same time, the physical properties of the resin pipe B while increasing the mechanical strength. The thermal expansion with a large degree can be suppressed.

  The tubular metal plate b1 provided with the plurality of opening holes b2 may be a punching metal or a metal plate b1 incorporated in a net shape, and is not particularly limited. Further, the above-described resin tube B (composite resin tube) is only required to be composed of a thermoplastic resin at least on the outer peripheral surface side, and is a tube metal plate b1 provided with a plurality of opening holes b2. The layer structure or the inner peripheral surface side may be a three-layer structure with other constituent materials.

  And it is possible to adjust pipe | tube intensity | strength and the melt | fusion intensity | strength of a melt | fusion part by the magnitude | size of the opening rate of the opening hole b2. For example, when the aperture ratio is increased, the bonding between the inner and outer resin layers is increased and the fusion strength is increased, while the tube strength is decreased and the elongation due to thermal expansion is increased. Conversely, if the aperture ratio is small, the fusion strength is low, but the tube strength is high and the elongation is small. It is desirable to select these according to the situation.

  The branch joint A according to the first embodiment configured as described above flows into the through hole 11a that connects the flow passage hole 11d that connects the resin pipes B formed in the joint body 11 and the outer surface of the joint body 11 to each other. The cylindrical portion 22b is inserted from the inside of the joint body 11 until the flange portion 22a comes into contact with the inner peripheral surface of the passage hole 11d, and then the sealing means 24 is mounted on the cylindrical portion 22b protruding from the joint body 11 and fixed. The assembly of the branch joint A is completed by screwing and screwing the tool 23 into the male screw formed in the cylindrical portion 22b.

  For connection between the branch joint A and the resin pipe B, first, the pressing member 11h is loosely fitted to both of the opposing resin pipes B, and the packing 11g is fitted.

  Next, both the resin pipes B are inserted into the main pipe connecting part 11c until their ends abut against the flange part 22a, and the tie rod 11m is inserted from one pressing member 11h so as to be connected to the opposing locking holes 11k. The nut 11n is screwed to the tip of the tie rod 11m protruding from the other pressing member 11h.

  At this time, due to the tightening of the nut 11n, the separation distance between the opposing pressing members 11h expands and contracts, and both packings 11g contacting the edge of the hole of the pressing member 11h are inward and radially inward of the resin tube B. The resin pipes B that are opposed to each other while being sealed are connected so as to be movable in the axial direction.

  Further, the branch joint A is connected to an external device such as a sprinkler head by engaging (screwing) the external device with the branch connection portion 23a, and a locking pin on the screwed portion between the fixture 23 and the cylindrical portion 22b. 5 is inserted and fixed.

  As described above, the joint body 11 according to the first embodiment can maintain the robustness of the cylindrical portion 22b for a long period of time, and even when the resin pipe B having a large degree of expansion and contraction due to a change in temperature is connected, The expansion and contraction can be easily absorbed while maintaining the fastening force.

(Embodiment 2)
As shown in FIGS. 5 and 6, the branch joint A according to the second embodiment is a modification of the end treatment of the resin pipe B connected to the branch joint A exemplified in the first embodiment. Since this is the same as that of the first embodiment, the same reference numerals are given and detailed description thereof is omitted, and only different portions will be described in detail below.

  That is, the resin tube B according to the second embodiment is in contact with the metal plate b1 or water unless the end portion is treated like the resin tube B illustrated in the first embodiment. There is a possibility that water and dust may enter between the main body b3 and the heating wire 31, which causes corrosion of the metal plate and poor fusion strength. Therefore, for example, as shown in FIG. 5, a ring-shaped member b4 is formed of resin or another material that does not corrode, and is bonded or fixed to the end of the resin tube B.

  Further, as shown in FIG. 6, a ring-shaped member b5 formed in such a shape with a thermoplastic resin that fits the outer diameter of the resin tube B and enters the inner peripheral surface of the resin tube B, or other material that does not corrode. May be fixed.

(Embodiment 3)
As shown in FIG. 7, the branch joint A according to the third embodiment shows a modification of the sealing means 24 exemplified in the first embodiment, and the components common to the first embodiment are denoted by the same reference numerals. Detailed description will be omitted, and only the differences will be described in detail below.

  The joint main body 12 according to the third embodiment is formed by forming a boss 12a having a flat upper surface only at the peripheral edge on the through hole 11a side of the joint main body 11 according to the first embodiment. In addition, you may form the upper surface by the side of the through-hole 11a of the coupling main body 11 concerning Embodiment 1 in flat shape. In this case, the flat surface can be easily formed by cutting.

  The sealing means 28 according to the third embodiment includes a fixture 26 and a seal member 29.

  The fixture 26 is a substantially annular metal member, and a female screw that is screwed with a male screw formed in the cylindrical portion 22b is formed on the inner peripheral surface from the middle portion to the vicinity of the lower portion, and the joint body A corner portion 26b on the inner bottom surface facing the outer surface of 12 is formed in an inclined surface shape that gradually decreases in diameter upward. Further, a branch connection portion 26a made of a female screw for connecting an external device or a branch pipe is formed on the inner peripheral surface extending from the midway portion to the upper portion.

  The seal member 29 is made of a rubber material such as NBR, and is formed in a hollow truncated cone shape along the inclined surface on the inclined corner portion 26b of the fixture 26, and is attached to the corner portion 26b. Has been. The lower end of the corner portion 26 is brought into close contact with the flat surface of the joint body so that the seal member does not protrude so as to maintain the seal surface pressure.

  In the branch joint A according to the third embodiment configured as described above, the seal member 29 is disposed between the fixture 26 and the boss 12a, and the fixture 26 is screwed into the cylindrical portion 22b. The seal member 29 is pressed to seal the outer peripheral surface of the cylindrical portion 22 b protruding from the outer surface of the joint body 12 and the outer surface of the joint body 12. Such a structure in which the two surfaces of the vertical surface and the horizontal surface are pressed and sealed with an inclined surface is stable, for example, when a rotational force is applied, when a force for inclining the cylinder portion is applied, or when a vibration force is applied. And can be sealed.

  According to the branch joint A according to the third embodiment, since the annular spacer member 24a illustrated in the first embodiment is not necessary, it is possible to improve the sealing performance as well as to reduce the places where there is a risk of leakage. . In addition, assemblability and quality control can be improved.

(Embodiment 4)
As shown in FIG. 8, the branch joint A according to the fourth embodiment is formed such that the height of the fixture 26 exemplified in the third embodiment is lower than the cylindrical portion 25 b protruding from the outer surface of the joint body 12. On the other hand, the branch pipe 25 provided with the fixture 27 and screwed with the fixture 27 forms a branch connection portion 25c made of a female screw for connecting an external device or a branch pipe to the inner peripheral surface of the cylindrical portion 25b. Therefore, the same components as those in the first and fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In the case of this embodiment, the number of components is small, the profile is low, and the weight is reduced. Therefore, the external device to be attached is more preferable for a device in which an inertial force is continuously applied like a sprinkler head described below.

(Embodiment 5)
In the fifth embodiment, as shown in FIG. 9, the branch joint A exemplified in the first embodiment, the sprinkler head S in which the nozzle s1 rotates, and the resin pipe B (composite resin pipe) in any form described above The snow-sprinkling sprinkler piping unit SU provided with is illustrated. The sprinkler head S has a known structure including a base portion s2 that is screwed with a branch connection portion 23a made of a female screw, and a rotating nozzle s1, and detailed description thereof is omitted.

  In this case, the loosening prevention means for preventing the loosening of the fixing member 23 and the cylindrical portion 25b is provided in addition to the locking pin 5 fitted from the outside into the screwing portion of the fixing tool 23 and the cylindrical portion 22b. The rotation direction of s1 and the screwing direction of the screwing portion are the same direction, and the looseness between the fixture 23 and the cylindrical portion 22b can be completely prevented.

  The snow extinguishing sprinkler piping unit SU configured in this way connects a plurality of resin pipes B (composite resin pipes) of a required length in a straight line through branch joints A along, for example, the railroad track. The sprinkler head S is connected to the branch portion 21 of each branch joint A and constructed.

  The snow extinguishing sprinkler piping unit SU constructed in this way has a strong connection with the resin pipe B, and is an extremely lightweight resin pipe B with mechanical strength, so that the overall weight can be reduced. As a result, in the middle of the branch joint A and the resin pipe B, the number of corresponding support members that support the entire weight can be greatly reduced or eliminated.

  In addition, the sprinkler head S in which the nozzle s1 rotates makes the branch pipe and the fixture constituting the branch section 21 made of metal even when a rotational moment is applied to the cylinder portion, and the collar portion of the branch pipe is curved along the inner surface. Because of its rectangular shape, it exhibits resistance to external forces such as rotation. Furthermore, since the flange body and the fixing tool sandwich and fix the joint body, the cylinder portion is not damaged and the robustness can be maintained over a long period of time.

  In addition, although Embodiment 5 illustrated what used the branch joint A illustrated in Embodiment 1, you may construct | assemble using any branch joint A of Embodiment 2-4, Since the branch joint A is also provided with a mechanically connected main pipe connection portion 11c, even if a resin pipe B having a large degree of expansion and contraction due to changes in temperature is connected, the expansion and contraction can be easily absorbed while maintaining the fastening force. It is very suitable. In particular, if the snow-shrinking sprinkler piping unit SU is constructed using the branch joint A according to the fourth embodiment, the branch portion 21 of this example is preferable because the structure is simple and the weight is reduced.

  Moreover, if the snow-sprinkling sprinkler piping unit SU is constructed using the resin pipe B described above, expansion and contraction due to a change in temperature can be suppressed by a metal plate, and substantially the same as a steel pipe. Therefore, it is possible to bring out the advantages of both strength and low expansion / contraction of the steel pipe and weight reduction by the resin pipe, and it is possible to reduce the supporting member that supports the piping unit.

(Embodiment 6)
As shown in FIG. 10, the sixth embodiment exemplifies a snow-dissipating panel p1 unit PU using the branch joint A of any of the first to fourth embodiments. This snow extinguishing panel p1 unit PU is constructed with a snow extinguishing panel p1, a water supply pipe p5, a reverse pipe p6, a return water pipe p7, a first connecting pipe p8, and a second connecting pipe p9. .

  The snow extinguishing panel p1 has a substantially rectangular heat radiating plate p2 having a snow receiving surface on the surface, and a twist formed by folding back at the end of the heat radiating plate p2 supported by a support tool p3 on the back surface of the heat radiating plate p2. And a heat radiating pipe p4.

  The water supply pipe p5 is composed of the above-described resin pipe B, and is connected to the respective main pipe connection portions 11c provided at both ends of the branch joint A of any one of the first to fourth embodiments. The unit 21 is connected so that water having a required temperature, which is a heat medium sent from a supply source, is branched from the water pipe p5.

  The reverse pipe p6 is composed of the above-described resin pipe B, and is connected to the end portion of the return pipe p7 described later at the end portion, so that the reverse water sent from the supply source is supplied. .

  The return water pipe p7 is composed of the resin pipe B described above, and is connected to each main pipe connection portion 11c provided at both ends of the branch joint A of any of Embodiments 1 to 4, and supplies water to the reverse pipe p6. The reverse water is supplied, and the water from the snow-dissipating panel p1 supplied (discharged) from the branch portion 21 of the branch joint A is accompanied by the reverse water. Connected back to the supplier.

  The first connecting pipe p8 has one end connected to the inlet of the heat radiating pipe p4 and the other end connected to the branch connecting portions 23a, 26a, 25c of the branch joint A connected to the water feeding pipe p5. The water at the required temperature is supplied from p5 to the heat radiating pipe p4 to heat and maintain the heat radiating plate p2 at the required temperature.

  The second connecting pipe p9 has one end connected to the outlet of the heat radiating pipe p4 and the other end connected to the branch connecting portion 23a of the branch joint A connected to the return water pipe p7. Water is collected in the return pipe p7.

  An adjustment valve p10 is connected to the middle part of the first connecting pipe p8 and the second connecting pipe p9.

  The snow removal panel p1 unit PU according to the sixth embodiment configured as described above, for example, lays the snow removal panel p1 along the railroad track and connects the snow removal panels p1 to each other. The first connecting pipe p8 and the second connecting pipe p9 connected to the snow extinguishing panel p1 are connected in parallel to the water supply pipe p5 and the reverse pipe p6 connected in a straight line.

  And the water supplied from the water supply pipe p5 enters the heat radiating pipe p4 through the first connecting pipe p8, warms the heat radiating plate p2, and collects water in the return water pipe p7 through the second connecting pipe p9. The snow that falls on the heat sink p2 is melted.

  The snowplow panel p1 unit PU according to the sixth embodiment constructed in this way is a very lightweight resin tube B with mechanical strength, so that the overall weight can be reduced, and the mechanical connection book Since the pipe connecting portion 11c is provided, even if the resin pipe B having a large degree of expansion and contraction due to a change in temperature is connected, the expansion and contraction can be easily absorbed while the fastening force is maintained, which is extremely preferable.

  As described above, the branch joint according to the present embodiment, the snow extinguishing sprinkler piping unit using the branch joint, and the snow extinguishing panel unit have been described. However, the above-described embodiment is a preferred embodiment of the present invention. This is an example, and the present invention is not limited thereto, and various modifications can be made without departing from the scope of the invention.

  For example, between the resin tube inserted at the end of the flow path hole and the inner surface of the end, a packing is provided so as to partially protrude outward from the end, and the packing is continuously inward. It is also possible to use a resin pipe connection method in which the resin pipe is connected so as to be movable in the axial direction by being pressed. In this case, as means for continuously pressing the packing inward, a male screw is formed on the outer peripheral surface of the resin tube, and a nut is screwed onto the male screw to press the packing inward. Or using a tension spring instead of the above-described tie rod.

  In addition, two or more through-holes may be provided in the joint body to form a branch joint having a plurality of branch portions (FIG. 11 illustrates a branch joint A ′ having branch portions 21C and 21D at two locations. ). Thus, in the case of this invention, since a coupling main body can also be formed from a general purpose resin pipe, a special shaping | molding die is not required and expense and management can be reduced. Also, the position and number of the through holes can be changed as appropriate in terms of the structure. Therefore, there is an advantage that the number and types of branch portions can be changed or combined (for example, a sprinkler head mounting portion and a branch pipe portion can be easily provided). In addition, although it can be said that it is desirable to use a composite resin pipe for the resin pipe B, it may be a normal resin pipe without the metal plate b1.

It is the perspective view which cut through the state where the branch joint concerning Embodiment 1 and the resin pipe were connected. It is a longitudinal cross-sectional view of the state which connected the branch joint and the resin pipe. It is the perspective view which cut the resin pipe longitudinally. FIG. 3 is an exploded perspective view of the branch joint taken along the vertical direction. It is a longitudinal cross-sectional view of the state which connected the resin pipe concerning Embodiment 2, and a branch joint. It is a longitudinal cross-sectional view of the state which connected the modification of the resin pipe | tube concerning Embodiment 2, and a branch joint. It is the perspective view which carried out the longitudinal section of the branch joint concerning Embodiment 3. FIG. It is the perspective view which carried out the longitudinal section of the branch joint concerning Embodiment 4. FIG. FIG. 10 is an exploded perspective view of a snow-sprinkling sprinkler piping unit according to a fifth embodiment, which is cut vertically. FIG. 10 is a partially cutaway front view of a snow extinguishing panel unit according to a sixth embodiment. It is a vertical front view of the branch joint concerning this Embodiment at the time of providing a branch part in two places.

Explanation of symbols

A ... Branch joint 11, 12 ... Joint body 11a ... Through hole 11c ... Main pipe connection part 11d ... Channel hole 11e ... Mechanical connection part 11f ... Inclined surface 11g ... Packing 11h ... Pressing member 11k ... Locking hole 11m ... Tie rod 11n ... Nut 12a ... Boss 21 ... Branch part 22,25 ... Branch pipe 22a ... Bridge part 22b, 25b ... Cylinder part 23,26,27 ... Fixing tool 26b ... Corner part 23a, 26a, 25c ... Branch connection part 24,28 ... Sealing means 24a ... Spacer member 29 ... Sealing member 4 ... O-ring 5 ... Locking pin B ... Resin pipe b1 ... Metal plate b2 ... Opening hole b3 ... Pipe body b4, b5 ... Ring-shaped member SU ... Snow-extinguishing sprinkler piping unit S ... Sprinkler head s1 ... Nozzle s2 ... Base PU ... Snow extinguishing panel unit p1 ... Snow extinguishing panel 2 ... heat radiating plate p3 ... support p4 ... radiator tube p5 ... water pipes p6 ... Reverse pipe p7 ... Modomizukan p8 ... first connecting pipe p9 ... second connecting pipe p10 ... regulating valve

Claims (11)

A joint body including a joint body provided with a flow path hole for connecting the resin pipes and connecting the resin pipes, and a branch part for branching the flow path to the outside,
The branch portion is
A cylindrical portion that is inserted into a through hole that communicates the flow path hole and the outer surface of the joint body so as to protrude from the outer surface; and a flange portion that is locked to the inner surface of the flow path hole. A branch pipe,
A fixture that is mounted around the cylindrical portion protruding from the outer surface of the joint body, and fixes the branch pipe by sandwiching the joint body with the flange portion;
A sealing means for sealing the through hole and the branch pipe;
The flow path hole is formed with a main pipe connection portion for connecting the resin pipe at an end thereof, and is provided between the resin pipe inserted into the main pipe connection portion and the main pipe connection portion. A branch joint characterized in that the resin pipe is connectable so as to be movable in the axial direction by a mechanical connection portion comprising a packing and a pressing member for pressing the packing inward.   The end of the flow path hole is formed in an inclined surface that gradually increases in diameter toward the outside, and the packing is provided between the inclined surface and the resin pipe. Item 1. The branch joint according to Item 1. The pressing member is formed in a frame shape that comes into contact with an end surface of the packing that partially protrudes,
The joint main body is formed so as to connect the opposing resin pipes in a straight line, and includes a tie rod that is engaged with the opposing pressing members and expands / contracts a separation distance between the pressing members. The branch joint according to claim 1 or 2, characterized by the above. The sealing means includes
A corner portion inside the bottom surface of the fixture facing the outer surface of the joint body is formed in an inclined surface shape that gradually decreases in diameter upward, and the inclined surface portion of the corner portion extends along the inclined surface. The seal member formed in the shape of a hollow frustum is wrapped around,
The seal member is pressed by the fixing tool to seal the outer peripheral surface of the cylindrical portion protruding from the outer surface of the joint body and the outer surface of the joint body. The branch joint described. The sealing means includes
A spacer member is interposed between the bottom surface of the fixture and the outer surface of the joint body, and an O-ring is provided around the bottom surface of the fixture and the bottom surface of the spacer member. The branch joint according to any one of claims 1 to 3.   The joint body is made of a thermoplastic resin, the branch pipe and the fixture are made of metal, and the branch pipe extends in a direction perpendicular or substantially perpendicular to the resin pipe. The branch joint according to any one of claims 1 to 5, wherein   The said fixing tool is provided with the branch connection part for connecting an external apparatus or a branch pipe to the said cylinder part or the said fixing tool while screwing together with the upper part of the said cylinder part. The branch joint in any one of 1-6. The branch connection portion is configured to be connectable with a sprinkler head, and the fixture includes a loosening prevention means for preventing loosening with the tube portion,
The loosening prevention means includes a locking pin that is fitted or screwed into the screwed portion between the fixing tool and the cylindrical portion from the outside, and / or the rotation direction of the sprinkler head and the screwing of the screwed portion. The branch joint according to claim 7, wherein an insertion direction is the same as a rotation direction of the sprinkler head. The branch joint according to claim 7 or 8,
A sprinkler head connected to the branch connection portion and sprinkling water while rotating;
A composite resin pipe connected to the main pipe connecting portion and having a tubular metal plate having a plurality of opening holes in the wall thickness of a pipe body having at least an outer peripheral surface made of a thermoplastic resin. ,
A snow-sprinkling sprinkler piping unit, wherein the snow-sprinkling body is sprinkled with water so that snow can be removed. A snow extinguishing panel unit using the branch joint according to claim 7,
A snow-dissipating panel comprising a heat radiating plate having a snow receiving surface on a surface thereof, and a heat radiating pipe disposed on the back surface of the heat radiating plate to flow a heat medium;
A plurality of water pipes that are connected to the main pipe connection section and send the heat medium sent from the supply source to the snow-fusing panel;
A plurality of return water pipes connected to the main pipe connection portion and returning the heat medium discharged from the snow-melting panel to a supply source;
A first connecting pipe having one end connected to the inlet of the heat radiating pipe and the other end connected to the branch connecting portion of the branch joint connected to the water supply pipe;
One end is connected to the outlet of the heat radiating pipe, and the other end includes a second connecting pipe connected to the branch connecting portion of the branch joint connected to the return water pipe. Snow panel unit. A branch pipe is inserted so as to protrude from the outer surface into a through hole that connects the flow passage hole formed between the resin pipes formed in the joint body and the outer surface of the joint body, and the branch pipe is inserted into the inner surface of the through hole. A resin pipe connection method in a branch joint that supports the branch pipe by clamping and holding the inner surface and the outer surface of the through-hole edge with a metal member,
Between the resin pipe inserted into the end of the flow path hole and the inner surface of the end, a packing is provided so as to partially protrude outward from the end, and the packing is directed inward. A resin pipe connecting method, wherein the resin pipe is connected so as to be axially movable by continuously pressing.

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