JP3126384U - Gas channel cutoff joint and gas meter suspension unit - Google Patents

Abstract

An inexpensive and safe gas flow path interrupting joint and a gas meter suspension unit that can easily connect a flexible flexible gas pipe and can shut off gas in the event of a fire.
A cylindrical main body 2 whose one end is connectable to another member, a push ring 3 whose tip is inserted into the cylindrical main body 2, and a tip of the push ring 3 inside the cylindrical main body 2 are provided. And a retainer 52 provided in the vicinity of the metal corrugate tube so that the metal corrugate tube is engaged with the retainer 52, and an annular seal member 62 is provided inside the tubular main body 2. This is because the gas flow path is provided with a gas blocking means having fire resistance that operates only when heated.
[Selection] Figure 2

Description

  The present invention relates to gas supply, particularly to a gas channel interrupting joint and a gas meter suspension unit that are connected to the inlet side of a gas meter and can close the channel in the event of a fire.

  In general, a gas meter that measures the amount of gas such as city gas is connected to and installed in a gas pipe set up along the outdoor wall of a house in a detached house, and in a pipe shaft provided on each floor in an apartment house. Installed. In recent years, these gas meters have been supported by various types of mounting devices with improved workability and unitization. For example, Patent Document 1 discloses a support member, an upstream end of a primary connection pipe to which a flexible gas pipe is connected to the support member, and a downstream side of a secondary connection pipe to which a flexible gas pipe is also connected. There is described a gas meter support device capable of supporting a gas meter with high strength even with a flexible flexible gas pipe, further comprising a fixing means for fixing the end portion.

  On the other hand, in order to maintain airtightness, pipe seals, gas plugs, inspection plugs and the like constituting the pipes around the gas meter are provided with rubber seal members therein. Therefore, when a fire breaks out, the sealing member is burned out and there is a risk of gas leakage, so it is necessary to safely shut off the gas flow path. Furthermore, most gas meters are made of aluminum, so in the worst case, if exposed to high temperatures in a fire for a long time, the connection of the gas meter may be melted and gas may flow out in large quantities. There is. From such a background, for example, in Patent Document 2, a cylindrical thermal expansion packing that is mounted in a joint body serving as a gas conduit and has fire resistance, and at least an inner peripheral surface of the thermal expansion packing are in contact with each other. In addition, a pipe line blocking member has been proposed that has a holding member that is deformed in a direction in which one end side closes the pipe line when the thermal expansion packing is heated and the other end side is supported by the pipe line.

JP 2005-114524 A JP 2004-167241 A

However, since the support device of the gas meter described in Patent Document 1 can be firmly fixed to the wall surface of the support device main body, it is beneficial in construction, but does not have a function of shutting off gas when a fire occurs. When the connection port of the gas meter is melted down, there is a problem that a gas leakage accident is caused.
The pipeline blocking member described in Patent Document 2 is advantageous in that it can block the pipeline in an unforeseen situation such as a fire. However, the number of connection points increases, which not only increases the number of construction steps, but also increases the possibility of gas leakage due to the connection points themselves. In addition, since the pipe line blocking member is provided between the gas meter and the gas plug, it requires the fire resistance of the gas plug, and the entire apparatus in which the gas meter is installed is expensive.

  In other words, the present invention provides an inexpensive and safe gas flow path interrupting joint and a gas meter suspension unit that can easily connect a flexible flexible gas pipe and can shut off gas in the event of a fire. The purpose is to do.

The present invention has a cylindrical shape in which a gas flow path penetrating inside is formed, a screw for connecting to another member is formed at one end, and a tool hook portion for engaging a tool is formed on the outer peripheral surface. A main body, a push ring whose tip is inserted into the inside of the cylindrical main body, and a retainer provided in the vicinity of the tip of the push wheel inside the cylindrical main body, and the metal corrugate tube It is configured to be inserted from the end toward the inside of the push wheel and the cylindrical main body and locked to the retainer, and an annular sealing material is provided inside the cylindrical main body, and the annular sealing material Is capable of sealing the outer periphery of the peak portion of the metal corrugate tube by its inner peripheral surface, and at least a part of the joint is formed of a material having fire resistance, in the gas flow path of the cylindrical main body, Only works when the fitting is heated A gas flow path block joint provided with the gas blocking means having a fire resistance.
At this time, the gas shut-off means is in contact with the thermal expansion member having fire resistance and at least the inner peripheral surface of the thermal expansion member, and at least in the direction of closing the gas flow path when the thermal expansion member is heated. The holding member can be deformed.

  The invention described in claim 3 is a gas meter inlet connection joint, an inlet side pipe connection port, a main body including a gas meter outlet connection joint and an outlet side pipe connection port, and a fixing for fixing the main body to a building wall or the like. A gas meter suspension unit for installing a gas meter and its inlet / outlet piping, with a fitting between the gas meter inlet connection joint and the inlet piping connection port via a handle. A gas stopper is provided by which the gas meter inlet connection joint and the inlet side pipe connection port are communicated with and shut off, and the inlet side pipe connection port is provided with any one of claims 1 and 2. It is a gas meter suspension unit provided with a gas flow path cutoff joint.

  According to the present invention, the gas flow path cutoff joint is configured such that a metal corrugate pipe is inserted from the end of the press ring toward the inside of the press ring and the cylindrical main body, and is locked to the retainer. In addition, since the gas flow path is provided with a gas barrier means having fire resistance that operates only when heated, a flexible metal corrugate pipe can be easily connected, and in the event of a fire At the time of occurrence, a gas flow path shutoff joint that shuts off the gas flow path can be supplied.

  According to the third aspect of the present invention, there is provided a gas stopper that allows the gas meter inlet connection joint and the inlet side pipe connection port to communicate with each other, and the inlet side pipe connection port has a metal corrugate pipe, Fire resistance that operates only when heated in the gas flow path, while being configured to be inserted into the inside of the pusher wheel and the cylindrical main body from the end of the gas pipe and locked to the retainer Because it is a gas meter suspension unit equipped with a gas flow path shutoff joint equipped with a gas shutoff means, it is possible to shut off the gas flow path upstream of the gas plug in the event of a fire, and fire resistance performance Even if a gas stopper having no is used, a gas meter suspension unit that does not deteriorate safety can be obtained.

  First, the best mode of the present invention will be described with reference to FIG. FIG. 1 shows a perspective view of an embodiment of a gas meter suspension unit of the present invention. In the gas meter suspension unit 100 shown in FIG. 1, a gas introduction pipe 140 is connected from below to an inlet side pipe connection port 113 that is an upstream end, and a gas meter inlet connection joint (union connection part) that is a downstream end. ) A gas meter outlet (not shown) is connected to a substantially U-shaped gas inlet main body 110 to which a gas meter inlet (not shown) is connected to 111 and a union connecting portion 121 which is an upstream end. A gas flow path is formed by the gas outlet pipe main body 120 to which the gas outlet pipe 150 is connected to the gas outlet pipe connecting port 123 which is the downstream end. In addition, the union connecting part 111 of the gas inlet pipe main body 110 and the union connecting part 121 of the gas outlet pipe main body 120 are separated from each other by a predetermined distance (that is, an interval between the inlet and outlet of the gas meter: 130 mm, for example). Thus, the support plate 130 is rotatably supported.

  Thus, the gas inlet pipe main body 110 is connected to the gas flow path cutoff joint 1 further upstream of the inlet side pipe connection port 113. The gas flow path cutoff joint 1 includes a cylindrical main body 2, a pusher 3 inserted into the cylindrical body 2, and a retainer provided in the vicinity of the tip of the pusher 3, and the metal corrugate pipe A is connected to the pusher 3. From the end of this, it is inserted toward the inside of the pusher wheel 3 and the cylindrical main body 2 and is configured to be locked to the retainer. Therefore, the metal corrugate tube A can be easily constructed. In addition, since a pipe line blocking member, which will be described in detail later, is provided inside the cylindrical main body, the gas flow path is blocked in the event of a fire to prevent gas leakage.

  In addition, a gas stopper 112 is provided above the union connection part 111 of the gas inlet pipe body 110 so that the union connection part 111 and the inlet-side pipe connection port 113 communicate with each other. It has been. That is, since the front face of the gas meter 200 and the front face of the gas stopper 112 coincide with each other, it is easy to check the open / close state and to operate. However, it is not limited to the front side, and for example, the operation part may be provided on the gas inlet main body 110 so as to be on the upper surface.

  Conventionally, in this type of gas stopper, a tapered stopper in which the inner peripheral surface of the gas stopper main body and the outer peripheral surface of the gas stopper are formed with a taper surface of about 1/6 is used. The taper plug (not shown) has a fire resistance performance and is excellent because the taper surface of the inner peripheral surface of the gas plug body and the outer peripheral surface of the gas plug made of metal are in direct contact with each other and sealed. Known as a gas tap. However, in order to seal between the tapered surfaces, the taper surface between the inner peripheral surface of the gas stopper main body and the outer peripheral surface of the gas stopper is required to have extremely precise roundness and surface roughness. In a complicated shape such as 110, skill required for processing the inner peripheral surface of the gas plug body has been required.

  In the present invention, the gas inlet pipe main body 110 is connected to the upstream side of the inlet side pipe connection port 113 with the gas passage cutoff joint 1, so that the downstream side of the gas passage cutoff joint 1 does not necessarily have fire resistance. Not needed. Therefore, the gas plug 112 does not need to be a tapered plug as described above. For example, a plug such as a ball valve or a cylindrical valve plug can be selected, and the ball valve or the cylindrical valve plug has a relatively high processing accuracy. Therefore, an inexpensive gas meter suspension unit can be obtained.

On the other hand, the gas outlet main body 120 is provided in the upper part of the union connection part 121 so that the inspection port 122 is substantially in front. A pressure detection plug 124 is screwed into the inspection port 122 so that a gas leak inspection instrument can be connected after construction or after a periodic replacement of the gas meter. In normal times, it is protected by a cylindrical resin cap so that dust does not enter or loosen accidentally. However, it is not limited to the front, and may be provided in the middle of the gas outlet main body 120, for example.
However, when both the gas stopper 112 and the inspection port 122 are in the front direction, the upper space of the gas meter suspension unit 100 can be used effectively.

  Next, an embodiment of the gas flow path breaker joint of the present invention will be described. FIG. 2 is a cross-sectional view showing a state in which a metal corrugate pipe is inserted into the gas flow path interrupting joint of one embodiment of the present invention, and FIG. It is sectional drawing which shows the state which carried out.

First, as shown in FIG. 2, the metal corrugate tube A is composed of a corrugated stainless steel (SUS304) corrugate tube 70 and a synthetic resin layer 71 made of vinyl chloride coated on the outer surface thereof. A stainless steel hoop material is continuously corrugated to form a flexible tube that can be bent, and then the resin coating process is performed to continuously coat a synthetic resin layer 71 of about 0.75 mm on the outer surface. Is formed.

The gas flow path interrupting joint 1 includes a cylindrical tubular body 2 having an inner wall surface formed in a stepped shape for inserting the metal corrugated tube A, and a tube insertion hole 24, and a tube insertion hole in the center. It is mainly comprised by the cylindrical ring shaped press ring 3 in which 30 was formed. The presser wheel 3 is formed in a ring shape from, for example, brass, and has a tube insertion hole 30 having a size that allows the metal corrugate tube A to be inserted therethrough. The pusher wheel 3 includes a head portion 30A having a large diameter and a sliding portion 30B having a small diameter, and the sliding portion 30B is fitted to the tip of the cylindrical main body 2 so as to be slidable along the longitudinal direction thereof. It is. Moreover, while providing the tool hook part 23 (refer FIG. 1), such as a hexagonal surface or an octagonal surface, in the outer peripheral surface of the cylindrical main body 2, the connection thread part 22 is provided in the end of the cylindrical main body 2, It can be connected to a piping member.
A main groove portion 32 having a substantially rectangular cross section is formed in a ring shape on the outer sliding surface of the distal end portion of the sliding portion 30B, and the inner wall of the cylindrical main body 2 facing the main groove portion 32 is also substantially A corresponding main groove portion 25 having a rectangular cross section is formed in a ring shape, and a ring-shaped elastic stop member 36 having a circular cross section is provided so as to occupy both the main groove portions 25 and 32 and can be elastically expanded and contracted. It has been. The elastic stop member 36 is accommodated in the main groove portions 25 and 32 in a state where a force is always applied in the direction of diameter reduction, that is, in a state where the diameter is elastically expanded. The shape of the elastic stop member 36 is formed in a C shape, for example, in which a part of a circular ring is cut out in order to enable expansion / contraction as described above. Further, the collar member 37 is formed in a C shape such that a part of a circular ring is cut out by, for example, resin or metal, and is detachably attached to the concave portion 38. It is mounted in close contact with each other, and the pusher wheel 3 is regulated so as not to slide.

  On the other hand, referring to FIG. 3, a pull-out preventing taper surface 50 is formed at the tip of the pusher wheel 3. The wedge portion 54 of the retainer member 52 that can be bent can be pressed against the concave portion 72 of the metal corrugate tube A. Although not shown, a plurality of the wedge portions 54 are provided in the cylindrical main body 2 along the circumferential direction thereof. Of course, the shape of the retainer member 52 is merely an example, and is not limited thereto.

Further, a watertight O-ring 34 made of a circular ring-shaped elastic body is interposed in the joint step portion of the outer peripheral surface of the press wheel 3 so that moisture does not enter inside, and the inner peripheral surface of the press wheel 3 has a ring-shaped elastic property. A watertight packing 35 made of a body is provided to prevent moisture from entering between the metal corrugate tube A.
In the present embodiment, an example is shown in which the retainer member 52 can be pressed against the recess 72 of the metal corrugate tube A when the pusher wheel 3 is pushed into the interior of the cylindrical body 2. The wedge part 54 of 52 is provided smaller than the diameter of the recessed part 72 of the metal corrugate tube A, and the operation of pushing the pusher wheel 3 into the interior of the cylindrical body 2 can be made unnecessary.

  A packing member 62 is provided on the step on the inner wall of the cylindrical main body 2. This packing member 62 is provided with an airtight packing 62A made of an elastic body formed in a circular ring shape and a fireproof packing 62B made of a circular ring shaped elastic body connected to the tip end side. The fireproof packing 62B may not have elasticity, may not be circular, for example, may be C-shaped, and the installation position may not be continuous with the airtight packing 62A. The position on the tip side is not limited. The airtight packing 62A is made of, for example, NBR (nitrile rubber), fluorine rubber, or the like, and the fireproof packing 62B is made of, for example, an elastic body obtained by integrally molding expanded graphite and a rubber material such as NBR, and in the event of a fire. When exposed to a high temperature such as this, the volume of the refractory packing 62B expands to seal the inside. When the metal corrugate tube A is inserted, the metal corrugate tube A can be inserted while elastically pressing the inner peripheral surfaces of the packings 62B and 62A.

  A ring-shaped stopper member 28 is interposed between the base end portion of the airtight packing 62 </ b> A and the step portion of the inner wall of the cylindrical main body 2. The stopper member 28 includes a ring portion 28A fixed to the cylindrical body 2 side, and a plurality of engagement pieces 28B provided at equal intervals along the circumferential direction on the inner side. The metal corrugate tube A is inserted inside the ring portion 28A, and the engagement piece 28B is arranged at a predetermined angle in the insertion direction of the metal corrugate tube A toward the center of the ring portion 28A, for example, The inner diameter of the tip is set to be smaller than the diameter of the convex portion 73 of the metal corrugate tube A.

  The stopper member 28 is made of, for example, resin or metal and has a certain degree of elasticity. Therefore, when the metal corrugate pipe A reaches the ring-shaped stopper member 28, the metal corgate pipe A is inserted into the inner side of the engagement piece 28B while being elastically expanded and contracted.

  Further, a part of the cylindrical main body 2 is provided with a through hole that passes through in the radial direction, and a selectively permeable member 66 that allows gas to permeate from the inside to the outside but does not permeate solid or liquid is attached to the through hole. May be. The permselective member 66 is not necessarily provided on the side of the pusher wheel 3, and a through hole may be provided on the tubular body 2 side or may be provided so as to be sandwiched between the tubular body 2 and the pusher wheel 3. . Since this selectively permeable member 66 allows gas to permeate from the inside of the joint to the outside, in the unlikely event that a hole is made in the metal corrugate pipe A by nailing or the like to leak gas, the surface of the corrugate pipe 70 and the outer surface of the composite are coated. The gas enters the joint through the gap between the resin layer 71 and the gas permeates the selectively permeable member and is ejected to the outside of the gas flow path shutoff joint 1. For this reason, after piping the metal corrugate pipe A, a gas leak detector is brought close to the portion of the selectively permeable member 66 of the gas flow path shutoff joint 1 to easily detect a hole in the metal corrugate pipe A. Can prevent gas accidents.

  A pipe line blocking member 4 is provided in the gas flow path 21 of the cylindrical main body 2. The pipe line blocking member 4 includes a cylindrical holding member 42 made of a heat-resistant metal material (for example, austenitic stainless steel such as SUS304) and a cylindrical thermal expansion member 41 having fire resistance held therein. Have.

  The heat-expandable thermal expansion member 41 is formed of a material having a mechanical strength such that it thermally expands at a temperature of 170 degrees or higher and does not collapse even when exposed to a high temperature of 800 degrees or higher. The thermal expansion member 41 is formed in a cylindrical shape. However, the thermal expansion member 41 is not limited to a complete cylinder, and a part of the thermal expansion member 41 is cut in the axial direction as long as the thermal expansion member 41 has a shape that closes the pipeline when thermally expanded. A missing cylinder or arc shape may be used. The holding member 42 is formed of a heat-resistant metal material. Examples of the metal material include austenitic stainless steel such as SUS304, martensitic stainless steel such as SUS420, silicon manganese steel, manganese chromium steel, Fe—Mn—Si, Fe—Ni—Co—Ti, and Fe—. Although shape memory alloys such as Ni-C can be used, they are preferably formed of stainless steel heat resistant steel (for example, austenitic stainless steel such as SUS304) because they are exposed to a high temperature of 800 degrees or more.

  As shown in FIG. 4, the holding member 42 is a member having a substantially U-shaped cross section including a base portion 42a and a comb-like deformed portion 42b longer than the base portion 42a, and a sheet-like heat between the base portion 42a and the deformed portion 42b. After the expansion member 41 (not shown in FIG. 4) is inserted and rounded, it can be inserted into the gas passage blocking joint. Also, the pipe line blocking member 4 is produced by setting the holding member 42 formed in a cylindrical shape in a mold, injecting a raw material into the molding cavity, and molding the thermal expansion member 41 into a cylindrical shape. Also good. When the gas flow path breaker joint is heated, that is, the thermal expansion member 41 is heated and its volume expands to several times to ten times, the holding member 42 has the comb-like deformed portion 42b as a gas flow. Bend inside the roadway breaker joint. Therefore, even when the gas flows in, the collapse of the thermal expansion member 41 is prevented by the deforming portion 42b and can remain inflated, and the gas conduit can be closed.

  The thermal expansion member 41 is made of, for example, a rubber compound obtained by kneading a raw material rubber, a graphite intercalation compound that thermally expands in a non-fired state, and, if necessary, a filler, a softening material, a vulcanizing agent, etc. It is manufactured by filling and molding, followed by press vulcanization. The graphite intercalation compound is, for example, a compound in which sulfate radicals are bonded between layers obtained by reacting sulfuric acid with graphite (a hexagonal crystal of carbon in which six-membered ring polymer layers are layered), and is 170 degrees or more When heated to 800 ° C to 1000 ° C, the apparent volume increases to 100 to 250 times when heated to 800 ° C to 1000 ° C. As the raw material rubber, natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene rubber (EPDM), silicone rubber (Q), or the like can be used. The thermal expansion member 41 is preferably manufactured with a composition and conditions such that the Shore A hardness is in the range of 50 to 80 degrees from the viewpoint of the sealing function.

  Furthermore, it is also effective to add a flame retardant to the thermal expansion member 41. For example, the amount of generated gas is small, and as the non-halogen flame retardant, zinc borate, ammonium polyphosphate, nitrogen phosphorus flame retardant, etc. can be added alone or in combination. Further, the above-mentioned fireproof packing 62B can also select the same material.

Therefore, according to the present invention, the gas flow path of the cylindrical main body is provided with the gas blocking means having fire resistance that operates only when the gas flow path blocking joint is heated. At the same time, a metal corrugate pipe can be easily connected to the gas flow path shutoff joint, and in the event of a fire, the thermal expansion member is heated and expanded to shut off the gas flow path. Since a shutoff joint can be supplied and the gas is shut off by the gas flow path shutoff joint of the present invention, it is possible to select an inexpensive material that does not have fire resistance for the downstream gas stopper, etc. It becomes possible.
Further, in the embodiment of the present invention, the pipe line blocking member 4 is described as a configuration including the thermal expansion member 41 and the holding member 42. However, the pipe line can be blocked when exposed to a high temperature such as a fire. If it is a simple structure, it is not restricted to embodiment.

  The gas flow path cutoff joint of the present invention can be used as a gas flow path cutoff joint for connecting a gas supply pipe for city gas or the like, particularly a gas supply pipe for introducing gas to a gas meter. Moreover, it can utilize as a gas flow path interruption | blocking joint which comprises a gas meter suspension unit.

It is a perspective view of one Example of the gas meter suspension unit of this invention. It is sectional drawing which shows the state which inserted the metal corrugate pipe | tube in the gas flow path interruption | blocking coupling of one Example of this invention. It is sectional drawing which shows the state which completed the connection of the metal corrugate pipe | tube to the gas flow path interruption | blocking coupling of one Example of this invention. It is a perspective view of one Example of the holding member used for the gas flow path interruption joint of the present invention.

Explanation of symbols

1: Gas flow path cutoff joint,
2: cylindrical main body, 21: gas flow path, 22: screw part for connection, 23: tool hook part, 24: pipe insertion hole, 25: corresponding main groove part, 28: stopper member, 28A: ring part, 28B: engagement Joint,
3: Push ring, 30: Pipe insertion hole, 30A: Head part, 30B: Sliding part, 32: Main groove part, 34: Watertight O-ring, 35: Watertight packing, 36: Elastic stop member, 37: Collar member, 38: Concave part 4: Pipe line blocking member, 41: Thermal expansion member, 42: Holding member, 42a: Base part, 42b: Deformation part 50: Tapered surface, 52: Retainer member, 54: Wedge part,
62: packing member, 62A: airtight packing, 62B: fireproof packing,
A: Metal corrugate pipe, 70: Colgate pipe, 71: Synthetic resin layer, 72: Concavity, 73: Convex part 100: Gas meter suspension unit 110: Gas inlet pipe body, 111: Cap nut, 112: Gas stopper, 113: Gas Inlet 120: Gas outlet body, 121: Cap nut, 122: Pressure plug, 123: Gas outlet, 124: Pressure plug 130: Support plate 140: Gas inlet pipe, 150: Gas outlet pipe

Claims (3)

A cylindrical main body in which a gas flow path penetrating inside is formed, a screw for connection to another member is formed at one end, and a tool hook portion for engaging a tool is formed on the outer peripheral surface;
A push ring having a tip inserted into the inside of the cylindrical main body, and a retainer provided in the vicinity of the tip of the push ring inside the cylindrical main body,
The metal corrugate pipe is inserted from the end of the press ring toward the inside of the press ring and the cylindrical main body, and is configured to be locked to the retainer.
An annular sealing material is provided inside the cylindrical main body, and the annular sealing material is capable of sealing the outer periphery of the peak portion of the metal corrugate tube by its inner peripheral surface, and at least a part of which has fire resistance. In the joint formed by
A gas flow path shutoff joint comprising a gas flow shutoff means having fire resistance that operates only when the joint is heated in the gas flow path of the cylindrical main body.   The gas shut-off means is in contact with a heat-expandable thermal expansion member and at least an inner peripheral surface of the thermal expansion member, and is held so as to be deformed at least in the direction of closing the gas flow path when the thermal expansion member is heated. It consists of a member, The gas flow path interruption | blocking joint of Claim 1 characterized by the above-mentioned. A main body including a joint for connecting a gas meter inlet, an inlet side pipe connection port, a joint for connecting a gas meter outlet and an outlet side pipe connection port, and a fixing bracket for fixing the main body to a building wall, etc. A gas meter suspension unit for installing piping,
By rotating a plug between the gas meter inlet connection joint and the inlet pipe connection port via a handle, the gas meter inlet connection joint and the inlet pipe connection port are communicated and blocked. Provided a gas stopper,
A gas meter suspension unit comprising the gas flow passage cutoff joint according to claim 1 or 2 at the inlet side pipe connection port.

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