JP2012063258A - Leakage detection method for water supply piping, and stop cock with leakage detection function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem that, though an electric method such as a wired system by electric wiring and a wireless system has been conventionally used as a leakage detection method for water supply piping, trouble such as a disconnection easily occurs and much labor is required for a construction, and especially, it is difficult or impossible to detect a leakage by small flow rate caused by the loose twist of a faucet plug or the aging of a packing, etc.SOLUTION: A stop cock with a leakage detection function includes an impeller mechanism to be rotated by leakage streams to flow into a middle axis flow channel 33 communicating with an impeller rotation channel 41 and the impeller rotation channel. A main-valve secondary side channel on-off valve 3 to be opened when passage water pressure being equal to or more than a prescribed value is imposed and a sub-valve body 45 to be raised together with the valve body 3 so as to block the impeller rotation channel are arranged thereby to reliably open/close the impeller rotation channel.

Description

  The present invention relates to a water leak detection method for water pipes for detecting leaks in water pipes due to minute flow rates, such as loosening of faucet faucets or aging of water stop packings, and a water stop cock with a water leak detection function used therefor It is.

  Conventionally, as shown in, for example, Patent Document 1, a water leak detection method for a water pipe is a plate-like electrode that contacts the ground, one end is in contact with water in the water pipe, and the other end is on the ground via a manhole. Measure the ground current that flows by the AC power that applies a constant AC voltage between the lead wire drawn out, the electrode and the other end of the lead wire, and the AC voltage output from this AC power source. There has been a method of determining water leakage when the value exceeds a predetermined value.

  In such a wired system using electrical wiring such as lead wires, the flow sensor and automatic shutoff valve installed in the ground communicates with the water flow controller installed on the ground via electrical wiring, so accidents such as disconnection It was easy to occur, and it required a lot of labor for the construction, and it also took cost. A wireless system according to Patent Document 2 is also proposed for such a wired system.

In contrast to the electrical water leakage detection means shown in Patent Documents 1 and 2, as a simple means of water leakage detection in the house, all the water taps in the house are closed and the rotation indicator of the water meter is rotated. There is also a method of confirming whether or not to perform, but as described in Patent Document 3, the applicant integrated a water stopcock and a water leakage detection mechanism that can also be set on the primary side of a water meter, It has been proposed to set as a water stopcock with a water leakage detection function in the secondary flow path of the valve.
JP 2000-258280 A JP 2002-340300 A JP 2009-156839 A

  However, the electrical leakage detection means shown in Patent Documents 1 and 2 both require large-scale facilities and construction, and require a large amount of cost. In addition, the method of checking whether the rotation indicator of the water meter rotates with all the water taps closed is that when the amount of water leakage is small, it does not rotate or continues to watch for a certain amount of time even if it rotates. Otherwise, there was a problem that it could not be determined whether the rotation index was moving.

  Moreover, all the conventional water leak detection methods are performed as detection means by a separate device regardless of the stop cock and the water meter, and only the position of the water administrator who is not related to the end user is considered. However, it is the end user who turns the water meter due to water leakage and is charged up to the price of unused water, and the end user has the most interest in water leakage.

  The applicant's proposal according to Patent Document 3 was to deal with the above-mentioned problem, but to check whether the rotation indicator of the water meter rotates by capturing the water leakage as the water meter slightly turns as a flow rate. Therefore, in the case of the invention according to Patent Document 3, the operation of the inner valve body that opens and closes the flow path of the water flow that rotates the impeller is a single unit. The problem was that it was difficult to ensure with the inner valve body alone.

  The present invention is intended to address the above-described problems, and integrates a water stopcock and a water leakage detection mechanism that can be set also on the primary side of a water meter, so that the secondary side flow of the flow valve opening and closing main valve of the water stopcock is integrated. By setting it as a stop cock with a water leak detection function on the road, if water leakage is confirmed, it can also serve as a shut-off valve by closing the stop cock as a means to shut it off, and detection operation In order to further ensure the operation of the main valve secondary side channel on / off valve that opens and closes the water flow channel that rotates the impeller that is the basis of the A sub-valve element that closes the flow path of the water flow that rises with the valve element and rotates the impeller is provided.

  In other words, by setting a water leak detection mechanism on the primary side of the water meter, it is possible to quickly detect the idling of the water meter due to minute water leaks, so that end users can be greatly interested in water leaks. In addition, an impeller rotating flow path into which a leaked water flows into the secondary side of the main valve opening / closing main valve of the stop cock and an impeller mechanism that rotates by the inflow of the leaked flow are provided, and an easy-to-sense indicator of the rotation of the impeller Based on the configuration of Patent Document 3 in which water leakage can be confirmed by:

  And, in order to ensure the operation of the main valve secondary side flow path on-off valve that opens and closes the flow path of water flowing to the secondary side and the water flow that rotates the impeller, the main valve secondary side flow path on-off valve A sub-valve that closes the flow path of the water flow that rises together with the valve body when it rises and rotates the impeller is provided, and a transparent window that can be seen from the outer surface of the stop cock is provided on the upper surface of the impeller rotation flow path. It is possible to visually check the impeller's rotating spear from the outer surface of the water stop cock so that the end user can also easily check for water leakage, and a magnet is embedded in the upper part of the impeller, and the impeller caused by the water leakage flow The pulse waveform output by the rotation of the car was captured by a reading device so that water leakage could be confirmed more clearly.

  Also, in order to ensure the operation of the main valve secondary side flow path opening / closing valve, when the main valve secondary side flow path opening / closing valve is raised, the water flow path that rises with the valve body and rotates the impeller is blocked. The main valve 2 is a valve body which is a male screw rod provided with a water passage by a U-shaped cut with the lower end opened at the center of the lower end of the main body obtained by cutting the both sides of the columnar top obliquely downward. It is configured to be screwed into a female screw hole formed at the bottom of the secondary flow path opening / closing valve so as to maintain simple assembly and structural robustness.

  Water supply by branch piping to general households is such that the main valve is open, and when the terminal faucet is opened, water is passed by the water supply pressure from the water distribution main, and the meter rotates. If the impeller rotates due to the water flow pressure inside the plug by opening the terminal faucet, water leakage cannot be detected, so a secondary valve is provided on the secondary valve on the secondary side of the main valve to pass through the plug. For normal water flow pressure, the secondary valve element that rises together with the main valve secondary side flow path opening / closing valve is configured to reliably close the impeller rotation flow path.

  That is, when the main valve opening / closing main valve of the stop cock is open and the terminal faucet is closed, the water flow in the main cock does not move, but the main valve secondary side flow opening / closing valve A flow path is formed through the middle shaft flow path from the impeller rotation flow path to the main body secondary side, and if there is water leakage due to loosening of the water tap or aging of the packing, the water leakage flow is caused by this flow path to the main body secondary. When the flow rate pressure due to normal water flow is applied by the normal operation of opening the terminal faucet, the inner valve body and the sub-valve body are rotated. However, the flow path is closed, and the water flow is allowed to escape to the secondary side of the main body without passing through the impeller rotation flow path, so that the impeller is not rotated.

  That is, in the above basic configuration, when the flow pressure due to the normal water flow is applied by the normal opening operation of the terminal faucet, the impeller rotation flow path is closed along with the rise of the main valve secondary side flow path opening / closing valve. An auxiliary valve was provided. In addition, by installing this stopcock on the primary side of a water meter, it is possible to detect water leaks by reading meter wheel readings, impeller rotation and pulse waveforms by end users themselves, etc. In order to solve the cause, the main valve for opening and closing the channel is closed for the first time to shut off the water leakage.

  As described above, a water stop cock and a water leakage detection mechanism that can be set also on the primary side of the water meter are integrated, and a water stop cock with a water leakage detection function is provided on the secondary side flow path of the main valve opening / closing main valve of the water stop cock. By setting, if water leakage is confirmed, it can also serve as a shut-off valve by closing the stop cock as means for shutting off the water leak.

  In addition, a transparent window that can be seen from the outer surface of the stop cock is provided on the upper surface of the impeller rotation flow path, so that the end user can easily check the rotating state of the impeller so that even end users can easily leak water. In addition to being able to check, there is an effect that a magnet is embedded in the upper part of the impeller, and the pulse waveform output by the rotation of the impeller by the leaked water flow is captured by a reading device so that the leak can be confirmed more clearly.

  In addition, the main valve has a sub-valve that blocks the flow path of the water flow that rises together with the valve body and rotates the impeller when the main valve secondary side flow path opening / closing valve is raised, and is cut obliquely downward on both sides of the columnar top. The valve body, which is a male screw rod provided with a water passage by a U-shaped cut with the lower end opened at the center of the lower end, is screwed into the female screw hole formed at the bottom of the main valve secondary side flow path opening / closing valve body As a result, it was possible to reliably block the flow path of the water flow for rotating the impeller, and to maintain simple assembly and structural robustness as a water stop cock.

1 shows an embodiment of a water stop cock with a water leak detection function according to the present invention, and is a longitudinal cross-sectional side view of the whole water stop cock with a main section showing a water-passage in the open state of a flow path opening / closing main valve as a cutaway cross section. Similarly, the enlarged longitudinal cross-sectional side view of the top of the stop cock showing the relationship between the main valve secondary side flow path opening / closing valve, the sub-valve and the impeller rotation flow path, and the inflow passage path of the leakage flow Similarly, the longitudinal cross-sectional side view of the impeller holder frame part which shows the structure of the impeller rotation flow path and the holder frame which accommodated the impeller Similarly, AA sectional view of FIG. Similarly, the relationship between the main valve secondary flow path opening / closing valve and the sub valve body and the structure are shown. The main valve secondary flow path opening / closing valve body is a longitudinal side surface, and the sub valve body is a side surface from the inclined cut surface side. Exploded view of main valve secondary side flow path opening and closing valve body and auxiliary valve body before screwing Similarly, the main valve secondary side flow path opening / closing valve body and the secondary valve body, which shows the relationship and structure between the main valve secondary side flow path opening / closing valve body and the secondary valve body, with the secondary valve body as a side surface from the oblique cut surface side. Longitudinal cross-sectional side view after screwing of valve body Similarly, the longitudinal cross-sectional side view after the main valve secondary side flow path opening / closing valve body and the sub valve body are screwed together with the sub valve body as the side face from the side face of the oblique cut Similarly, top view of impeller holder frame Similarly, the longitudinal cross-sectional side view of the impeller holder frame by the AA line of FIG. Similarly, a longitudinal cross-sectional side view of the entire stop cock showing the structure according to an embodiment in which a magnet is embedded in the impeller index portion and a pulse waveform due to rotation of the index portion is read and detected. Similarly, a pulse waveform reading diagram according to an embodiment in which a magnet is embedded in the impeller index portion and a pulse waveform due to rotation of the index portion is read and detected. The side view of the water meter unit which made the principal part which shows the state which set the water faucet with a water leak detection function by this invention to the primary side of a water meter, and was comprised in the water meter unit made into the notch cross section

  Embodiments of the present invention will be described below with reference to the drawings. 1 is a stop cock main body, the inflow port 11 from the water distribution main pipe opens to the primary side, and water flows into the outflow port 12 through the channel opening / closing main valve 2 by the ball valve body, A valve seat 31 and a casing 32 of the main valve secondary side flow opening / closing valve 3 are set in the upper part of the valve chamber 13 of the flow opening / closing main valve 2, and a holder frame 5 for storing the impeller 4 is supported on the upper part. It is fixed.

  The main valve secondary side flow path opening / closing valve 3 is a floating valve that is housed in a bowl-shaped casing 32, rises due to the water passage pressure in the normal terminal faucet opening operation, and settles by its own weight. The central shaft flow path 33 is formed in the part, and the inlets 42 and 42 and the impeller housing from the middle shaft flow path 33 to the sub valve body insertion portion 54 of the holder frame 5 and the impeller housing chamber 51 opened to the partitioning portion 52. The flow path communicates with the impeller rotation flow path 41 configured by the chamber 51.

  The upper end portion of the central shaft channel 33 is fitted into the lower end portion of the holder frame 5, and the outer peripheral surface thereof is in sliding contact with the inner peripheral surface of the central shaft channel 33 to raise and lower the main valve secondary side channel on / off valve 3. To guide. The lower end portion of the central shaft channel 33 is opened to form a channel from the primary side, but a female screw 44 is engraved on the inner periphery of the lower end open portion to constitute the backbone of the subvalve body 45. It engages with the male screw of the flange 45a.

  The sub-valve body 45 is a valve body that is a male screw rod 45a provided with a water passage 45e by a U-shaped cut 45b having a lower end opened at the lower end central part of the main body that is cut obliquely downward on both sides of the top of the columnar shape. It is screwed into a female screw 44 formed at the lower end of the central shaft flow path 33 and fixed in the valve body 43 of the main valve secondary flow path opening / closing valve. The base portion of the male screw rod 45a serves as a communication passage 45h extending from the water passage 45e to the central shaft passage 33.

  When the main valve secondary side flow path opening / closing valve body 43 rises due to the water flow pressure inside the plug by the normal opening operation of the terminal faucet, the subvalve element 45 also rises. First, by the oblique cut of the top part of the subvalve element 45 When the pointed head 45c is fitted into the lower end portion of the holder frame 5 and further rises to reach the basic cylindrical portion 45d of the valve body, the inner periphery of the lower end of the holder frame 5 and the outer periphery of the cylindrical portion are fitted to each other. The lower end is completely closed.

  However, when a weak water pressure is applied by loosening the faucet faucet or leaking water, a water flow having a flow rate corresponding to the degree of insertion of the sub-valve top cusp 45c is formed by the oblique cut surface 45f. Since the half-moon-shaped gap 45g flows into the impeller rotation passage 41 through the auxiliary valve body insertion portion 54 according to the degree of opening, the rotation operation of the impeller can be made fine.

  The upper part of the holder frame 5 is an impeller accommodating chamber 51 for accommodating the impeller, and a support shaft support hole 47 for embedding and supporting the inlets 42 and 42 to the impeller accommodating chamber and the impeller rotating support shaft 46 is set. The lower part partitioned by the partition part 52 becomes the auxiliary valve body insertion part 54, and the lower end part is opened and closed with the casing 32 by the elastic fitting member 34 that forms the valve seat 31 of the main valve secondary side flow path opening / closing valve 3. It is fitted and fixed to the upper part of the valve chamber 13 of the main valve 2.

  The impeller 4 is formed of a material such as Duracon that is easily rotated even by a micro flow, and is provided with a rotation indicator portion 4a at the top and a rotary blade 4b at the shaft periphery, and penetrates into the support shaft support hole 47 of the holder frame partitioning portion 52. Is inserted and covered in a free-rotating state on an impeller rotating support shaft 46 that is installed upright.

  A water stopcock with a water leakage detection function configured as described above is provided when a terminal faucet is opened with the main valve 2 opened by the operation handle 2a of the flow path opening / closing main valve 2. The water flow from the inlet 11 by the supply water pressure from the pipe pushes up the valve body 43 and the sub-valve body 45 of the main valve secondary side flow path opening / closing valve 3 so as to be separated from the valve seat 31 and between the ribs 32a of the casing 32. The water is passed through the outlet 12 on the secondary side and the water meter is turned so that water comes out from the faucet.

  At this time, the feed water flow simultaneously passes through the middle shaft flow path 33 of the main valve secondary side flow path on / off valve 3 to the middle shaft flow path opening of the main valve secondary side flow path on / off valve body (male thread through the sub valve body). Although the water flows into the water channel 45e), the water pressure inside the plug pushes up the sub valve body 45 together with the valve body 43 of the main valve secondary side flow path opening / closing valve, and the outer periphery of the cylindrical portion is the lower end inner periphery of the holder frame 5. Since the inlet half-moon-shaped gap 45g to the sub valve body insertion portion 54 is not formed, it does not flow into the sub valve body insertion portion 54 of the holder frame.

  When water leakage occurs, the water passage pressure caused by the operation of the terminal faucet does not occur. Therefore, the force by which the water passage pressure pushes up the valve body 43 and the sub-valve body 45 is reduced, and is formed by the inclined cut surface 45f by the reduced amount. The half-moon-shaped gap 45g increases. The leaked water flows into the sub-valve fitting portion 54 of the holder frame from the half-moon-shaped gap 45g, and flows into the impeller housing chamber 51 through the inlets 42, 42 to the impeller housing chamber of the partition portion 52 to face each other. The impeller 4 is rotated by the rotating blade 4b from the direction.

  The water leakage flow that has rotated the impeller 4 flows out into the recessed portion 53 on the upper surface of the holder, is guided to the recessed flow path 53a, and is discharged from the four drain holes 53b set on the upper surface of the holder to the secondary side of the stop cock. It is discharged to the outlet 12. The upper portion of the holder frame upper recessed portion 53 is a rotation indicator space 15 of the impeller 4 that passes through the top of the water faucet body 1, and is covered with a transparent plate 14 and passed through the transparent plate from the top of the water faucet body 1. The rotational wrinkles of the impeller 4 can be confirmed visually.

  FIG. 12 shows a state in which the water faucet with a water leak detection function according to the present invention is set to the primary side of the water meter and is configured in the water meter unit, and the water faucet detects water leakage by configuring in this way. In this case, the main valve 2 can be closed immediately by the operation handle 2a of the flow path opening / closing main valve 2, and the convenience of being able to check the water leakage by the user himself / herself in addition to the presence or absence of water leakage at every meter reading. There is.

  As another embodiment, as shown in FIG. 10, a magnet 4c is embedded in the side portion of the tip rotation indicator portion 4a that the impeller 4 rotates (after embedding, the magnet 4c is completely covered with a cap, so it cannot be seen from the outside. In addition, a support frame 61 is provided at the cover position, the magnetic force sensor 6 is set, and the pulse waveform output intermittently by the rotation of the impeller 4 due to the leakage water flow is detected by reading with a reading device.

  For example, when a DC voltage of 3 V is applied to the magnetic force sensor 6, the magnetic lines of force are interrupted or opened according to the rotation of the impeller 4, so that an intermittent output of 3V−0V−3V−0V. The pulse waveform as shown in Fig. 5 is displayed on the reading device, and water leakage is captured more reliably. As the reading device, for example, an analyzing recorder manufactured by Yokogawa Electric is used.

  Since the present invention is configured as described above, it has been difficult to find until now, and the meter is rotated by wastefully flowing water, which places an extra burden on the user or causes aging of the packing that causes trouble. It is possible to easily detect minute water leaks and can greatly contribute to the saving of water resources.

DESCRIPTION OF SYMBOLS 1 Stop cock main body 11 Primary side inlet 12 from the water main of a stop cock main body Secondary side outlet 13 of a stop cock main body Valve chamber 14 of a flow-path main valve 14 Cover cover transparent of impeller rotation indicator space Plate 15 Impeller rotation indicator space at the top of the stop cock body 2 Flow path opening / closing main valve 2a by ball valve body of the stop cock body Operation handle 3 of the flow path opening / closing main valve 3 Main valve Secondary side flow path opening / closing valve 31 Main valve Valve seat 32 of the secondary side flow path on / off valve Casing 32a of the main valve secondary side flow path on / off valve Casing rib 33 of the main valve secondary side flow path on / off valve casing Middle shaft flow of the main valve secondary side flow path on / off valve Path 34 Elastic fitting member 4 Impeller 4a Impeller rotation indicator portion 4b Impeller rotary blade 4c Indicator portion embedded magnet 41 Impeller rotation passage 42 Inlet port to impeller accommodation chamber 43 Main valve secondary side passage opening / closing valve Valve body 43a Middle shaft hole 43b of main valve secondary side flow path opening / closing valve Leakage of bottom surface of main valve secondary side flow path opening / closing valve body Inlet 44 Female screw 45 on the inner periphery of the central shaft passage opening Secondary valve body 45a Male screw rod 45b constituting the backbone of the secondary valve body U-shaped cut 45c at the lower end of the male screw rod Pointed head 45d Main cylindrical part 45e of subvalve body U-shaped cut water passage 45f at the lower end of male screw rod 45f Top-part inclined downcut surface 45g of half-moon-shaped gap 45h due to oblique downcut Communication passage 46 to the valve body insertion portion Impeller rotation support shaft 47 Impeller rotation support shaft support hole 5 Impeller holder frame 51 Impeller housing chamber 52 Partition portion 53 of impeller holder frame Recessed portion 53a on the upper surface of the holder frame Holder frame Recessed channel 53b on the upper surface Drain hole 54 from the upper surface of the holder frame to the secondary side Sub valve body insertion portion 6 of the holder frame Magnetic sensor 61 Magnetic sensor support frame

Claims (8)

An intermediate shaft passage communicating with the inlet to the impeller rotation passage is provided in the middle shaft of the main valve secondary side passage on / off valve that opens at a flow rate higher than a predetermined flow rate. A main valve secondary side flow path opening / closing valve provided with a secondary valve element that rises together with the main valve secondary side flow path opening / closing valve and closes the impeller rotation flow path when the side flow path opening / closing valve is opened;
Set the secondary side flow path of the main valve of the stop cock,
A water stop cock provided with an impeller mechanism that rotates by a leakage flow that flows into the impeller rotation passage through the middle shaft passage of the main valve secondary passage opening / closing valve is attached to the water pipe, and the rotation of the impeller Water leak detection method for water supply piping characterized by detecting water leak by   The secondary valve body is a valve body that is a male screw rod provided with a water passage by a U-shaped cut with a lower end opened at the center of the lower end of the main body that is cut obliquely downward on both sides of the columnar top. The water leak detection method for water pipes according to claim 1, wherein the water pipe is formed by screwing into a female screw hole formed at the bottom of the side flow path opening / closing valve.   The water leak detection method for water pipes according to claim 1 or 2, wherein a water stop cock provided with an impeller mechanism rotating by a water leak flow is attached to the primary side of the water meter.   A magnet is embedded in the upper part of the rotating impeller, and a magnetic sensor is set at the cover position, and the pulse waveform intermittently output by the rotation of the impeller caused by the leakage flow is captured by the reading device to detect leakage. A water leak detection method for water pipes according to claim 1 or claim 2 or claim 3, wherein   An intermediate shaft passage communicating with the inlet to the impeller rotation passage is provided in the middle shaft of the main valve secondary side passage on / off valve that opens at a flow rate higher than a predetermined flow rate. A main valve secondary side flow path opening / closing valve provided with a secondary valve element that rises together with the main valve secondary side flow path opening / closing valve and closes the impeller rotation flow path when the side flow path opening / closing valve opens, An impeller mechanism is provided which is set as a secondary flow path of the main flow path opening / closing main valve and is rotated by a leakage flow flowing into the impeller rotation flow path through the central shaft flow path of the main valve secondary flow path opening / closing valve. A water stop valve with a water leakage detection function, wherein the main valve secondary side flow path opening / closing valve is set as the secondary side flow path of the flow valve opening / closing main valve of the water stop cock   The valve body, which is a male screw rod provided with a water passage by a U-shaped cut with the lower end opened at the center of the lower end of the main body that is cut obliquely downward on both sides of the cylindrical top, 6. A water faucet with a water leakage detection function according to claim 5, wherein the water faucet is configured to be screwed into a female screw hole formed in a bottom portion.   The water leakage according to claim 5 or 6, wherein a transparent window is provided on an upper surface of the impeller rotating flow path that passes through the outer surface of the water faucet so that a rotating flaw of the impeller can be visually confirmed from the outer surface of the water faucet. Stop cock with detection function   A faucet body in which a magnet is embedded at the top of a rotating impeller and a magnetic sensor is set at the cover position, and a reading device that captures and reads a pulse waveform output intermittently by rotation of the impeller due to a water leakage flow, and The water stop cock with a water leak detection function according to claim 5, claim 6 or claim 7.

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