JP4690222B2 - Stopcock - Google Patents

Description

  The present invention relates to a water stop cock that is attached to an end portion of a synthetic resin pipe provided in, for example, a water piping system and seals the end portion.

  This kind of stop cock seals the end of the synthetic resin pipe when inspecting the watertightness of a domestic tap water piping system in which a synthetic resin pipe such as a cross-linked polyethylene pipe or a polybden pipe is used. Used to do. That is, the pressure change in the water piping system is examined with a pressure gauge connected to the water piping system in a state where the end of the synthetic resin tube is sealed with a water stop cock and the water piping system is sealed. And from this pressure change, the water tightness of a water piping system, ie, the presence or absence of water leakage, is determined.

Conventionally, as a stop cock used for such a water-tightness test | inspection, there exist some which were described in patent document 1, for example. As shown in FIG. 15, the stop cock 50 has a cylindrical main body 51 into which an end of the synthetic resin pipe P can be inserted, and the synthetic resin pipe P is provided on the inner peripheral side of the cylindrical main body 51. A sealing member 52 is provided for sealing between the outer peripheral surfaces of the two. Further, inside the cylindrical main body 51, the insertion of the synthetic resin pipe P into the cylindrical main body 51 is permitted, the removal of the inserted synthetic resin pipe P is restricted, and the restriction state is manually operated. A releasable lock mechanism 53 is provided. The lock mechanism 53 includes a holding ring 55 having a holding hole 54 through which the synthetic resin pipe P can be inserted. The holding ring 55 is biased by a spring 56 so as to be inclined. The end portion of the synthetic resin pipe P inserted into the cylindrical main body 51 is held in the cylindrical main body 51 as the inner peripheral edge of the holding ring 55 bites in. In this state, the end of the synthetic resin pipe P is sealed with the water stop cock 50. Further, when the holding ring 55 is raised from the inclined state by pushing the operating piece 57 provided with the lock mechanism 53, the biting of the holding hole 54 with respect to the outer peripheral surface of the synthetic resin pipe P is released, and the synthetic resin pipe The holding state of P is released. Therefore, the water stop cock 50 is easily attached only by being inserted into the end portion of the synthetic resin pipe P, and is easily removed only by pressing the operation piece 57.
JP 2000-258282 A

  However, in the water stop cock of the above-mentioned patent document 1, since the synthetic resin pipe P is held by causing the inner peripheral edge of the holding hole 54 of the holding ring 55 to bite into the outer peripheral surface of the end portion of the synthetic resin pipe P, the synthetic resin pipe The end peripheral surface of P is scratched. On the other hand, the synthetic resin pipe P is connected in a state where the packing is in contact with the outer peripheral surface of the end of the connecting part of a faucet appliance or a washing machine. For this reason, when the synthetic resin pipe P with a scratch on the outer peripheral surface of the end portion is connected to the connection portion, the watertightness of the connection portion between the synthetic resin pipe P and the faucet device or the washing machine may be impaired. . In addition, even if the worker is requested to cut off the end portion of the synthetic resin pipe P once the stop cock is attached so that the damaged end portion of the synthetic resin pipe P is not used, the work is performed. There is no guarantee. Therefore, there is a problem that the reliability of the water tightness of the water piping system after the water tightness test is lowered.

  The present invention has been made paying attention to such problems existing in the prior art. The purpose of this is to make it easy to attach to the end of the synthetic resin pipe and to prevent the end of the synthetic resin pipe damaged by attaching a water stopcock from being used as it is. An object of the present invention is to provide a water stop cock that can improve the reliability of watertightness of a system.

In order to achieve the above object, the invention according to claim 1 is a water stop cock that is attached to an end of a synthetic resin pipe provided in a water piping system and seals the end. an annular body in which the end portion of the resin tube is opened to be inserted across, this is held on the inner peripheral side of the annular body, crowded have food on the outer peripheral surface of the inserted plastic tube from one end opening of the toroidal fuselage A locking ring that restricts the withdrawal of the synthetic resin tube and a lid-shaped body that detachably seals the other end opening of the annular body, and a holding piece is formed on the inner peripheral edge of the locking ring And the tip of the sandwiching piece bites in an oblique direction along the axial direction of the synthetic resin tube with respect to the outer peripheral surface of the synthetic resin tube to restrict the synthetic resin tube from being pulled out. , One end opening of the annular body, and a protrusion having a smaller diameter than the inner diameter of the locking ring. For example, the axial length of the projection is characterized in that it is longer than the length in the axial direction of the one end opening of the toroidal fuselage to the tip of the clamping piece of the locking ring.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the lid-like body is provided with an opening / closing mechanism for communicating the inside of the synthetic resin tube to the outside. .
According to a third aspect of the present invention, in the second aspect of the present invention, the projection is attached to a cylindrical portion integrally formed with the lid-like body and an inner periphery of the cylindrical portion via a screw. An opening / closing shaft is provided, and the opening / closing mechanism is provided between the cylindrical portion and the opening / closing shaft.

  The invention according to claim 4 is the invention according to claim 3, wherein the opening / closing mechanism is in contact with a sealing surface formed on one of the cylindrical portion and the opening / closing shaft, and the sealing surface. And a sealing member provided on the other side as possible.

  According to a fifth aspect of the present invention, in the invention of the fourth aspect, the open / close shaft communicates with the inside and the outside of the synthetic resin tube and opens at the front end surface thereof, so that the sealing surface and the sealing shaft are sealed. A flow path that is opened and closed by a stop member is provided.

(Function)
In the first to fifth aspects of the present invention, when the end of the synthetic resin tube is inserted into one end opening of the annular body in the water stop cock, the locking ring bites into the outer peripheral surface in an oblique direction, and the synthesis The end of the resin tube cannot be detached from the annular body. Therefore, it is possible to easily attach the water stop cock by simply inserting the end of the synthetic resin tube. In addition, in order to remove the stop cock from the synthetic resin pipe after the inspection of the water pipe system, the stop cock must be separated from the main body side of the synthetic resin pipe together with the end of the synthetic resin pipe. At this time, the lid-like body is removed from the annular body with the end portion of the synthetic resin tube inserted, and the projection of the lid-like body is pressed against the end surface of the synthetic resin tube that protrudes outward from the annular body. Can be pushed into. Then, since the end portion of the synthetic resin tube is moved in the insertion direction, it moves without being restricted by the locking ring, and finally comes off the locking ring and falls off the annular body. Therefore, the end of the synthetic resin pipe with scratches on the outer peripheral surface is not used for connection with a connection part such as a faucet appliance, improving the water leakage reliability of the water piping system after inspection To do.

  According to the second aspect of the invention, in addition to the action of the first aspect of the invention, when the inside of the synthetic resin pipe is communicated to the outside by the opening / closing mechanism in a state of being attached to the end of the synthetic resin pipe. The air in the water piping system is discharged to the outside by the water pressure of the water piping system. Therefore, it is possible to speed up the water tightness inspection.

  According to the invention described in claim 3, in addition to the action of the invention described in claim 2, the cylindrical portion and the opening / closing shaft also serve as projections, so the number of parts is reduced and the configuration is simplified.

  According to the present invention, the end of the synthetic resin pipe is easy to attach to the end of the synthetic resin pipe, and the end of the synthetic resin pipe damaged by attaching the water stop cock is not used as it is. The reliability of watertightness can be improved.

Next, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1, 2, 3, and 5, a watertightness inspection stop cock (hereinafter simply referred to as a stop cock) 10 attached to an end of a synthetic resin pipe P is substantially made of metal. An annular body 11 is provided which is formed in a cylindrical shape and into which an end of the synthetic resin pipe P is inserted. As shown in FIG. 4, the annular body 11 has a cylindrical peripheral wall portion 11 a, and a peripheral edge portion 11 b that protrudes toward the inner peripheral surface is provided at one end opening portion thereof. A first female screw portion 12a is provided near the peripheral edge portion 11b on the inner peripheral surface of the peripheral wall portion 11a, and a first diameter larger than that of the first female screw portion 12a is provided near the other end opening of the peripheral wall portion 11a. Two female screw portions 12b are provided.

  A metal retainer 13 having a male screw portion on the outer peripheral surface is screwed onto the first female screw portion 12a, and a groove 13a for turning the retainer 13 is formed on one end surface thereof. A locking ring 14 is held together with a spacer 15 between the other end surface of the retainer 13 and the inner surface of the peripheral edge portion 11b.

  The locking ring 14 is formed in an annular shape by pressing from a metal plate having a spring property, and as shown in FIG. 6, the locking ring 14 is inclined toward the central axis of the base portion 14 a around the entire inner peripheral edge of the annular flat plate-like base portion 14 a. A plurality of support pieces 14b and sandwiching pieces 14c protruding in the direction are formed alternately. As shown in FIGS. 7A and 7B, the tip of each support piece 14 b comes into contact with the outer peripheral surface of the synthetic resin pipe P inserted into the locking ring 14. Each sandwiching piece 14c extends longer than each support piece 14b, and its tip bites into the outer peripheral surface of the synthetic resin pipe P into which the locking ring 14 is inserted.

  As shown in FIGS. 1 and 5, a metal lid-like body 16 that seals the other end opening of the annular body 11 is detachably screwed into the second female threaded portion 12 b of the annular body 11. Has been. As shown in FIG. 4, the end surface of the synthetic resin pipe P inserted into the annular body 11 and the locking ring 14 can come into contact with the inner end surface of the lid-like body 16. Further, an O-ring 17 through which the synthetic resin pipe P is inserted is provided on the inner peripheral surface of the lid-shaped body 16, and the O-ring 17 seals between the inner peripheral surface and the outer peripheral surface of the synthetic resin pipe P. It has come to be stopped. A knurled portion 16 b for rotating the lid-like body 16 relative to the annular body 11 is provided on the outer peripheral surface of the lid-like body 16.

  Furthermore, as shown in FIG. 4, the bottom wall portion 16a of the lid-like body 16 is provided with an opening / closing mechanism 18 for communicating the inside of the synthetic resin pipe P whose tip end surface is in contact with the inner end surface thereof to the outside. ing. The opening / closing mechanism 18 has a cylindrical portion 19 extending in the axial direction of the lid-like body 16, and a communication passage 20 penetrating in the axial direction is formed inside the cylindrical portion 19. An open / close shaft 21 having a male screw portion on the outer peripheral surface is screwed to the female screw portion 20 a formed on the inner peripheral surface of the communication path 20. In this embodiment, the cylindrical portion 19 and the opening / closing shaft 21 form a protrusion. The cylindrical portion 19 and the opening / closing shaft 21 have a smaller diameter than the inner diameter of the peripheral edge portion 11b of the annular body 11 and the minimum inner diameter of the locking ring 14 (that is, the inner diameter of the circle where the tip of each holding piece 14c is located). Has been.

  As shown in FIG. 4, the open / close shaft 21 has a flow path 22 that extends in the axial direction and opens to the outer end surface. The flow path 22 passes through a communication hole 23 provided at the base end of the open / close shaft 21. The communication passage 20 is communicated. Further, a knurling portion 24 for manual rotation and a groove portion 25 for screwing are formed on the distal end side of the opening / closing shaft 21. Further, an O-ring (sealing member) 26 capable of contacting the sealing surface 20 b in the communication path 20 is provided on the outer periphery of the opening / closing shaft 21 on the base end side with respect to the communication hole 23. The opening / closing shaft 21 is screwed into the female threaded portion 20a of the communication passage 20 to bring the O-ring 26 into contact with the sealing surface 20b, thereby sealing the inside of the synthetic resin pipe P inserted into the water stop cock 10. . Further, the open / close shaft 21 allows the O-ring 26 to be separated from the sealing surface 20b by loosening the screw into the female threaded portion 20a of the communication passage 20, and the inside of the synthetic resin pipe P inserted into the water stop cock 10 to the outside. Communicate. The opening / closing mechanism 18 includes a cylindrical portion 19, an opening / closing shaft 21, a flow path 22, an O-ring 26, and the like.

Next, the operation of this embodiment configured as described above will be described.
For example, when inspecting the water tightness of a water piping system after construction in a house, first, as shown in FIG. 9, a stop cock 10 is attached to the end of one synthetic resin pipe P used in the water piping system. Plug in. Then, as shown in FIG. 10, the locking ring 14 and the O-ring 17 are fitted to the end portion of the synthetic resin pipe P into which the water stopper 10 is inserted, and the front end surface of the synthetic resin pipe P is a lid shape It contacts the inner end surface of the body 16. At this time, as shown in FIGS. 7A and 7B and FIGS. 8A and 8B, the tips of the support pieces 14b of the locking ring 14 come into contact with the outer peripheral surface of the synthetic resin pipe P. The tip of each sandwiching piece 14c bites in an oblique direction along the axial direction with respect to the outer peripheral surface of the synthetic resin pipe P, thereby restricting the slip of the synthetic resin pipe P. For this reason, the end portion of the synthetic resin pipe P is in a state where it cannot be removed from the water stop cock 10.

  Next, water is supplied to the water piping system, and as shown in FIG. 11, the opening and closing shaft 21 is loosened in this state, thereby allowing the inside of the synthetic resin pipe P to communicate with the outside. Then, the air inside the water piping system is released to the outside through the synthetic resin pipe P and the stop cock 10 due to the water pressure in the water piping system. When the air in the water piping system is released to the outside, the water in the water piping system is subsequently released to the outside through the stop cock 10. In this state, when the opening / closing shaft 21 is tightened, the end of the synthetic resin pipe P is sealed, and the water piping system is sealed. And the water tightness of a water piping system can be test | inspected by observing the water pressure change of a water piping system with time with the water pressure tester which is not illustrated connected to the water piping system.

  In order to remove the stop cock 10 from the synthetic resin pipe P after the end of the inspection, as shown in FIG. 12, the end P1 of the synthetic resin pipe P is cut with a pipe cutter or the like at a position as close as possible to the stop cock 10. Then, the end part P1 of the synthetic resin pipe P in which each clamping piece 14c of the locking ring 14 has sunk is separated from the main body side of the synthetic resin pipe P together with the water stop cock 10.

  Next, the lid-like body 16 is removed from the annular body 11 with the end portion P1 of the synthetic resin pipe P inserted therein, and the tip of the opening / closing shaft 21 of the lid-like body 16 is connected to the annular body as shown in FIG. 11 is pressed against the end surface of the end portion P1 of the synthetic resin pipe P protruding outside from the peripheral edge portion 11b side, and the end portion P1 is pushed into the annular body 11. Then, the end portion P1 of the synthetic resin tube P pushed in the insertion direction moves without being restricted by the locking ring 14, and finally comes off from the locking ring 14 as shown in FIG. Drop off 11 Accordingly, the end portion P1 of the synthetic resin pipe P whose outer peripheral surface is damaged by the locking ring 14 is not used for connection with a faucet device or the like.

Next, effects of the present embodiment described in detail above will be listed.
(1) When the end portion P1 of the synthetic resin pipe P is inserted into one end opening of the annular body 11 in the water stopcock 10, each holding piece 14c of the locking ring 14 held on the inner peripheral side of the annular body 11 is synthesized. The synthetic resin pipe P does not come off the annular body 11 by biting in an oblique direction with respect to the outer peripheral surface of the resin pipe P. Therefore, it is possible to easily attach the water stop cock 10 only by inserting the end of the synthetic resin pipe P.

  (2) Further, in order to remove the water stop cock 10 from the synthetic resin pipe P after the inspection of the water piping system, it must be separated from the main body side of the synthetic resin pipe P together with the end portion P1 of the synthetic resin pipe P. Then, in order to take out the end portion P1 of the synthetic resin pipe P that is still inserted into the annular body 11, the end portion P1 is annularly formed by the cylindrical portion 19 and the opening / closing shaft 21 of the lid-like body 16 removed from the annular body 11. What is necessary is just to push inside the fuselage 11. Therefore, since the end P1 with the scratch on the outer peripheral surface due to the locking ring 14 is not used for connection with a connection part such as a faucet instrument, the leakage reliability of the water piping system after inspection is improved. .

  (3) The lid-like body 16 is provided with an opening / closing mechanism 18 for communicating the inside of the synthetic resin pipe P inserted into the water stop cock 10 with the outside. For this reason, in the state where the stop cock 10 is attached to the end portion P1 of the synthetic resin pipe P, the water pressure in the water piping system can be discharged to the outside by the water pressure of the water piping system, thereby speeding up the water tightness inspection. can do.

  (4) The protrusion is constituted by a cylindrical portion 19 integrally formed on the lid-like body 16 and an opening / closing shaft 21 attached to the inside of the cylindrical portion 19 via a screw, and the cylindrical portion 19 and the opening / closing shaft are formed. An opening / closing mechanism 18 is provided between the two. Accordingly, since the cylindrical portion 19 and the opening / closing shaft 21 also serve as projections, the number of parts is reduced and the configuration is simplified.

  (5) The opening / closing shaft 21 is provided with a flow path 22 that communicates the inside and the outside of the synthetic resin pipe P and opens at the front end surface thereof and is opened and closed by an O-ring 26 provided on the opening / closing shaft 21. Therefore, by rotating the opening / closing shaft 21 to move the O-ring 26 and opening the flow path 22, air can be efficiently extracted from the water piping system, so that workability is improved.

It should be noted that the present invention can be modified and embodied as follows.
-The solid projection is provided without the opening / closing mechanism 18 also serving as a projection.
The O-ring 26 is provided on the lid body 16 side, and the sealing surface with which the O-ring 26 abuts is provided on the opening / closing shaft 21 side.

The perspective view which shows the water stop cock of one Embodiment. (A) is a top view, and (b) is a bottom view. (A) is also a front view, and (b) is a right side view. Sectional view on the aa line in FIG. Similarly disassembled perspective view. The perspective view which shows a locking ring. (A) is a front view which shows a locking ring, (b) is a front view which shows the locking ring by which the synthetic resin pipe was penetrated. (A), (b) is a partial longitudinal cross-sectional view in the clamping piece of a locking ring. The front view which shows the water stop cock at the time of use. The longitudinal cross-sectional view which shows the water stop cock at the time of use. The longitudinal cross-sectional view which shows the water stop cock at the time of use. The longitudinal cross-sectional view which shows the water stop cock at the time of use. The longitudinal cross-sectional view which shows the water stop cock at the time of use. The longitudinal cross-sectional view which shows the water stop cock at the time of use. The longitudinal cross-sectional view which shows the conventional piping leak inspection tool.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Water stop cock, 11 ... Ring body, 14 ... Locking ring, 16 ... Lid body, 18 ... Opening / closing mechanism, 19 ... Cylindrical part which comprises protrusion and opening / closing mechanism, 20b ... Sealing surface, 21 ... Projection And an opening / closing shaft constituting the opening / closing mechanism, 22 ... a flow path constituting the opening / closing mechanism, 23 ... a communication hole, 26 ... an O-ring as a sealing member constituting the opening / closing mechanism, P ... a synthetic resin pipe, P1 ... (synthesis) The end of the resin tube.

Claims (5)

A water stop cock that is attached to an end of a synthetic resin pipe provided in a water piping system and seals the end,
An annular body having both ends into which the end of the synthetic resin tube can be inserted; and
This is held on the inner peripheral side of the annular body, a locking ring for regulating the escape of crowded have eating the synthetic resin tube on the outer peripheral surface of the synthetic resin tube which is inserted from one end opening of the toroidal fuselage,
A lid-like body that detachably seals the other end opening of the annular body,
A clamping piece is formed on the inner peripheral edge of the locking ring, and the tip of the clamping piece bites in an oblique direction along the axial direction of the synthetic resin tube with respect to the outer peripheral surface of the synthetic resin tube. Regulates the resin tube from slipping out,
The lid-like body includes one end opening of the annular body, and a protrusion having a smaller diameter than the inner diameter of the locking ring ,
The length of the projection in the axial direction is longer than the length in the axial direction from the one end opening of the annular body to the tip of the holding piece of the locking ring .   The water stop cock according to claim 1, wherein the lid-like body is provided with an opening / closing mechanism for communicating the inside of the synthetic resin pipe with the outside.   The protrusion is constituted by a cylindrical part integrally formed on the lid-like body, and an opening / closing shaft attached to the inner periphery of the cylindrical part via a screw, and between the cylindrical part and the opening / closing axis. The water stop cock according to claim 2, wherein the opening / closing mechanism is provided.   The said opening / closing mechanism is provided with the sealing surface formed in one of the said cylindrical part and an opening-and-closing axis | shaft, and the sealing member provided in the other so that contact with this sealing surface was possible. The water stop cock according to Item 3.   The opening / closing shaft is provided with a flow path that communicates the inside and the outside of the synthetic resin tube and opens at a front end surface thereof, and is opened and closed by the sealing surface and a sealing member. The water stop cock according to 4.

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