JP6945932B2 - Leakage detection device - Google Patents

Description

The present invention relates to a water leakage detection device, which is attached to a valve device having a water stopping function.

Patent Document 1 discloses a composite valve device in which a pressure reducing valve that reduces the internal pressure of the secondary side passage with respect to the internal pressure of the primary side passage and a relief valve that opens and closes according to the internal pressure of the secondary side passage are combined. ..
In the combined valve device disclosed in Patent Document 1, high-pressure water in the secondary side passage is discharged to the external environment through the drainage pipe of the relief valve.

Japanese Unexamined Patent Publication No. 62-159875

The relief valve may leak due to a foreign object being bitten. An object of the present invention is to provide a water leakage detection device capable of quickly and surely detecting water leakage from various valve devices having a water stopping function such as a relief valve, a drain plug, a can body protection valve, and a drain water drain valve. ..

In order to solve the above problems, in the present invention, a tubular body having a pair of grooves extending in the longitudinal direction facing each other across the central axis and a water flow detection arranged in the pair of grooves are detected. and a sensor, providing a leak detection device, characterized in that attached to the valve apparatus having a water stop function.
If a valve device having a water blocking function and a water leakage detection device is installed, the cylinder body is directed diagonally downward and the groove is directed downward toward the tip from the base near the valve device, and the valve device is provided. Regardless of the amount of drainage from the main valve, the drainage can be quickly and reliably detected by the water flow detection sensor arranged in the groove by flowing the drainage into the groove. If the detected drainage is drainage when the valve device must be closed, it can be immediately determined that the valve device is leaking. Therefore, according to the present invention, it is possible to quickly and surely detect water leakage from various valve devices having a water stopping function, and to quickly maintain the valve device and the device to which the valve device is attached.
If a pair of grooves facing each other across the central axis of the cylinder are formed on the inner surface of the cylinder and a water flow detection sensor is arranged in the pair of grooves, one of the grooves can be directed downward. Since the valve device or the device to which the valve device is attached may be arranged, the degree of freedom in the arrangement of the valve device or the device to which the valve device is attached is increased.
In a preferred embodiment of the present invention, the leak detection device is pre-installed in the valve device.
In a preferred embodiment of the present invention, the leak detection device is retrofitted to the valve device.
The leak detection device may be pre-installed in the valve device or may be retrofitted to the valve device. When it is retrofitted to the valve device, the leak detection function can be easily added to the valve device that did not have the leak detection function.
In a preferred embodiment of the present invention, the water leakage detection device is retrofitted to the valve device, and the cylinder body is rotatably attached to the valve device around the central axis.
If the cylinder is rotatably attached to the valve device around the central axis, the direction in which the cylinder is directed can be freely selected, which increases the degree of freedom in arranging the valve device or the device to which the valve device is attached. Further, when a pair of grooves facing each other across the central axis of the cylinder are formed on the inner surface of the cylinder and a water flow detection sensor is arranged in the pair of grooves, a valve device or a valve device is attached. Even if the orientation of the equipment is changed, it may be possible to rotate the cylinder and point one of the grooves downward, so the valve device or the device to which the valve device is attached can be freely arranged. The degree increases.
In a preferred embodiment of the present invention, the water flow detection sensor is a pair of electrodes fixed to a cylinder and extending from the outside in the radial direction into the groove.
In a preferred embodiment of the present invention, the water flow detection sensor is a single temperature sensor fixed to the cylinder and extending from the outside in the radial direction into the groove.
The water flow detection sensor may be a pair of electrodes, a single temperature sensor, or other suitable known water flow detection means.

FIG. 5 is a cross-sectional view of a composite valve in which a relief valve and a pressure reducing valve to which a water leakage detection device according to an embodiment of the present invention is attached are combined, when the pressure reducing valve is opened and when the relief valve is closed. (A) is an overall cross-sectional view, (b) is a partially enlarged view of (a), and (c) is a cc enlarged cross-sectional view of (a). It is sectional drawing at the time of closing a pressure reducing valve valve and at the time of closing a relief valve of a composite valve in which a relief valve and a pressure reducing valve to which the leak detection device according to the embodiment of the present invention is attached are combined. (A) is an overall cross-sectional view, and (b) is a partially enlarged view of (a). FIG. 5 is a cross-sectional view of a composite valve in which a relief valve and a pressure reducing valve to which a water leakage detection device according to an embodiment of the present invention is attached are combined, when the pressure reducing valve is closed and when the relief valve is opened. (A) is an overall cross-sectional view, and (b) is a partially enlarged view of (a). It is a structural drawing of the 2nd valve body which is a constituent member of the relief valve to which the water leakage detection device which concerns on embodiment of this invention is attached. (A) is a top view, (b) is a cross-sectional view taken along the line bb of (a), (c) is a view taken along the line cc of (a), and (d) is a view of (a). It is a dd arrow view, and (e) is a cross-sectional view taken along the line (c). It is a structural drawing of the piston head of the pressure reducing valve integrated with the relief valve to which the water leakage detection device which concerns on embodiment of this invention is attached. (A) is an end view of the side where the components of the relief valve are engaged, (b) is a view taken along the line bb of (a), and (c) is a cross-sectional view taken along the line cc of (a). (D) is a dd cross-sectional view of (a), and (e) is an e-e cross-sectional view of (a). It is a figure which shows the procedure of assembling to the piston head of the 2nd valve body which constitutes the relief valve which attached the water leakage detection device which concerns on embodiment of this invention. It is sectional drawing of the water leakage detection device which concerns on another Example of this invention, and the composite valve which attached the detection device. (A) and (d) are overall cross-sectional views of the composite valve, (b) is a cross-sectional view of bb of (a), and (c) is a cross-sectional view of a modified example of the water leakage detection device.

A combined valve in which a relief valve and a pressure reducing valve to which a water leakage detection device according to an embodiment of the present invention is attached will be described.
As shown in FIG. 1, the composite valve 1 includes a body 2. The body 2 has a primary side passage 2a and a secondary side passage 2b formed inside, and also has a cylinder 2c and a diaphragm case 2d.
The composite valve 1 includes a piston head 3 that slides back and forth in the cylinder 2c, an oring 4 that seals a sliding contact portion between the piston head 3 and the inner peripheral surface of the cylinder 2c, and a cylinder that extends from one end of the piston head 3. A piston rod 5 protruding from one end of 2c to a secondary passage 2b outside the cylinder 2c, a first valve seat 6 formed by the one end of the cylinder 2c, and one end of the piston rod 5 protruding outside the cylinder 2c. The first valve body 7 which is fixed to the first valve seat 6 and faces the first valve seat 6, the first spring 8 which engages with the first valve body 7 and urges the piston head 3 in the valve closing direction, and the body 2 A spring retainer 9 for the first spring 8 which is watertightly screwed and fixed to the portion forming the next side passage 2b to accommodate the first spring 8 and which accommodates the first valve body 7 so as to be reciprocally slidable, and a cylinder 2c. An opening 10 formed in a portion of the peripheral wall facing the piston rod 5, a tubular body 11 having one end facing the other end of the piston head 3, and a central portion fixed to the vicinity of the one end of the tubular body 11. The above-mentioned diaphragm 12, which is formed by a part of the body 2, faces the diaphragm 12, and cooperates with the diaphragm 12, the cylinder 2c, and the piston head 3 to form a pressure-sensitive chamber 13 communicating with the secondary passage 2b. It accommodates the diaphragm case 2d, the second spring 14 that presses the diaphragm 12 toward the pressure sensitive chamber 13, the second spring 14, the central portion and the other end of the tubular body 11 in the longitudinal direction, and cooperates with the diaphragm case 2d. Then, the spring case 15 that sandwiches the peripheral edge portion of the diaphragm 12, the second valve seat 16 disposed at the one end portion of the tubular body 11, and the other end portion of the piston head 3 are engaged via the third spring 17. A second valve body 18 facing the second valve seat 16 is provided. The spring constant of the third spring 17 is set to a small value.

The tubular body 11 includes a first portion 11a having an end portion arranged in the pressure sensitive chamber 13 and a second portion 11b arranged in the spring case 15 and connected and fixed to the first portion 11a. The first portion 11a and the second portion 11b cooperate to sandwich the central portion of the diaphragm 12. As described above, the second valve seat 16 is disposed at one end of the first portion 11a arranged in the pressure sensitive chamber 13, and the one end is externally fitted to the cylinder 2c so as to be reciprocally slidable. A plurality of openings 11a'are formed in the fitting portion. The end portion of the second portion 11b near the first portion 11a forms a spring retainer for the second spring 14, and the end portion separated from the first portion 11a is internally fitted to the tubular portion 15a of the spring case so as to be reciprocally slidable. doing.
A groove 19b extending in the longitudinal direction of the tubular body 19a is formed on the inner surface of the base of the tubular body 19a integrally formed with the spring case 15 and extending from the spring case 15, and a pair of electrodes 19c which are water flow detection sensors are arranged in the groove 19b. It is installed. The electrode 19c is fixed to the tubular body 19a by insert molding or other methods and extends from the outside in the radial direction into the groove 19b. The water leakage detection device 19 is composed of a cylinder 19a, a groove 19b, and a pair of electrodes 19c.

The pressure reducing valve α is formed by the cylinder 2c, the piston head 3, the first valve seat 6, the first valve body 7, the first spring 8, the diaphragm 12, the second spring 14, and the like. The pressure reducing valve α is a lift valve having a central axis X, that is, a deadline mechanism having a closing member having at least one component opening and closing along the central axis X perpendicular to the closing surface. The first valve body 7 performs an opening / closing operation perpendicular to the closing surface along the central axis X. The first valve body 7 has two points, a sliding contact portion between the piston head 3 and the inner peripheral surface of the cylinder 2c separated from each other in the central axis X direction, and a sliding contact portion between the first valve body 7 and the spring retainer 9. Is guided in the X direction of the central axis.
The relief valve β is formed by the cylinder body 11, the diaphragm 12, the second spring 14, the second valve seat 16, the third spring 17, and the second valve body 18. The relief valve β is a lift valve that shares the central axis X with the pressure reducing valve α. The second valve seat 16 and the second valve body 18 perform an opening / closing operation perpendicular to the closing surface along the central axis X. The second valve seat 16 is a sliding contact portion between the second cylinder portion 11b and the spring case cylinder portion 15a, which are spaced apart from each other in the central axis X direction, and a sliding contact portion between the first cylinder portion 11a and the cylinder 2c. It is guided in the X direction of the central axis at two points.

As shown in FIG. 4, the second valve body 18 has a bottomed cylindrical case 18a and a seal member 18b fitted and fixed to the case 18a. An annular bulging portion 18c in the radial direction is formed on the outer peripheral side surface of the open end portion of the case 18a. A pair of arm portions 18d extend outward in the radial direction from the outer peripheral side surface of the case 18a at intervals of 180 degrees in the circumferential direction. An annular groove 18e for accommodating one end of the third spring 17 is formed on the bottom wall of the case 18a.
As shown in FIG. 5, the other end of the piston head 3 has a large diameter recess 3a for accommodating the second valve body 18, and the large diameter recess 3a has a small diameter for accommodating the other end of the third spring 17. A recess 3b is formed. _{The large-diameter recess 3a has a pair of first vertical grooves 3a 1} extending from the other end of the piston head 3 facing each other with the central axis X in between, and a _{peripheral groove 3a 2} extending from the end of the _{vertical groove 3a 1.} a second longitudinal grooves 3a ₃ of the pair extending toward sandwiched between the central axis X in the course of the circumferential grooves 3a ₂ from opposing circumferential groove 3a ₂ to the other end of the piston head 3 is formed. The second vertical groove 3a ₃ is terminated without reaching the other end of the piston head 3. A part of the peripheral groove 3a ₂ penetrates the peripheral wall of the large-diameter recess 3a to form a slit.
The arm portion 18d of the second valve body 18, the third spring 17 having one end engaging with the second valve body 18 and the other end engaging with the small diameter recess 3b of the piston head 3, and the first piston head 3. The vertical groove 3a ₁ , the peripheral groove 3a ₂ , and the second vertical groove 3a ₃ form a bayonet type connection mechanism that pushes and twists between the second valve body 18 and the other end of the piston head 3.
When attaching the second valve body 18 to the other end of the piston head 3, the third spring 17 is inserted into the small diameter recess 3b as shown in FIG. 6A, and the pair of arm portions 18d is attached to the pair of first. The second valve body 18 is inserted into the large-diameter recess 3a, and the annular groove 18e is inserted into the third spring 17 while facing the vertical groove 3a _{1 and sliding the annular bulge 18c against the peripheral side surface of the large-diameter recess 3a.} The second valve body 18 is further pushed into the large-diameter recess 3a while pressing the third spring 17, and when the arm portion 18d comes _{into contact with one side wall of the peripheral groove 3a 2} , the pushing is stopped, and FIG. As shown in b), the second valve body 18 is twisted and rotated around the stop axis X along the _{peripheral groove 3a 2.} During rotation, the second valve body 18 receives the urging force of the third spring 17, and the arm portion 18d is pressed against the other side wall of the _{peripheral groove 3a 2. When the second valve body 18 continues to rotate and the arm portion 18d reaches the rotation position facing the second vertical groove 3a 3} , as shown in FIG. 6 (c), the second valve body 18 receives the urging force of the third spring 17. As shown in FIG. 6D, the valve body 18 moves toward the other end of the piston head 3 while engaging the arm portion 18d with the second vertical _{groove 3a 3, and the arm portion 18d moves in the second vertical groove.} It comes into contact with the end of the groove 3a _{3 and stops.} The second valve body 18 is attached to the other end of the piston head 3 by the above procedure. The second valve body 18 attached to the other end of the piston head 3 has an annular bulging portion 18c and a sliding contact portion between the peripheral side surface of the large-diameter recess 3a, which are spaced apart from each other in the central axis X direction, and an arm. It is guided in the extending direction of the central axis X at two points of the engaging portion between the portion 18d and the second _{vertical groove 3a 3.}

The operation of the compound valve 1 will be described.
When a water discharge device (not shown) connected to the secondary side passage 2b via a pipe (not shown) is closed and the water flow in the pipe is stopped, the first valve body 7 is the first valve body 7 as shown in FIG. 1 The pressure reducing valve α is closed in contact with the valve seat 6. As for the relief valve β, unless the internal pressure of the secondary side passage 2b (hereinafter referred to as the secondary pressure) reaches the valve opening pressure, the seal member 18b of the second valve body 18 subjected to the urging force of the third spring 17 is the first. 2 The valve is closed by contacting the valve seat 16. When the sealing member 18b of the second valve body 18 is in contact with relief valve to the second valve seat 16 beta is closed, the arm portion 18d of the second valve body 18 extending middle of the second longitudinal grooves 3a ₃ Ali the end portion of the second longitudinal grooves 3a ₃ not contacting.
Since the secondary side passage 2b and the pressure sensitive chamber 13 communicate with each other, the secondary pressure is applied to the diaphragm 12. The primary pressure is not transmitted to the pressure sensitive chamber 13 and is not applied to the diaphragm 12 because the O-ring 4 seals the sliding contact portion between the piston head 3 and the cylinder 2c.
When the water discharge device is opened, the secondary pressure decreases, and the urging force in the valve closing direction due to the secondary pressure applied to the diaphragm 12 decreases, and as shown in FIG. 1, the first valve body 7 becomes The pressure reducing valve α is opened apart from the first valve seat 6. When tap water flows through the annular gap formed between the first valve body 7 and the first valve seat 6, a pressure loss occurs, and the tap water is depressurized.
If the secondary pressure rises for some reason during the operation of the pressure reducing valve α, the diaphragm 12 elastically deforms in the direction away from the first valve seat 6 against the urging force of the second spring 14, and is fixed to the diaphragm 12. The tubular body 11 moves away from the piston head 3, the piston head 3 receives the urging force of the first spring 8, and the first valve body 7 moves following the tubular body 11, and the first valve. Body 7 approaches the first valve seat 6. As a result, the annular gap between the first valve seat 6 and the first valve body 7 is narrowed, and the pressure loss when tap water passes through the annular gap is increased. As a result, the secondary pressure drops. Therefore, the pressure reducing valve α maintains the secondary pressure at a predetermined value.
During the operation of the pressure reducing valve α, the contact state between the seal member 18b of the second valve body 18 subjected to the urging force of the third spring 17 and the second valve seat 16 is maintained, and the relief valve β is closed. ..

When the secondary pressure rises to the closing pressure of the pressure reducing valve α during the operation of the pressure reducing valve α, the first valve body 7 comes into contact with the first valve seat 6 and the pressure reducing valve α is in the closed state of FIG. ..
When the secondary pressure further rises beyond the valve closing pressure of the pressure reducing valve α, the diaphragm 12 is further elastically deformed in the direction away from the first valve seat 6, and the tubular body 11 is further moved in the direction further away from the piston head 3. When the cylinder 11 moves further away from the piston head 3, the second valve body 18 that receives the urging force of the third spring 17 maintains the contact state with the second valve seat 16 and moves the cylinder 11. However, when the secondary pressure reaches the valve opening pressure of the relief valve β, the arm portion 18d comes into contact with the _{end portion of the second vertical groove 3a 3} and the relief valve β of the second valve body 18 is closed. Movement is restricted.
When the secondary pressure rises beyond the valve opening pressure of the relief valve β, as shown in FIG. 3, it moves away from the piston head 3 following further elastic deformation in the direction away from the first valve seat 6 of the diaphragm 12. The second valve seat 16 moving in the direction is separated from the seal member 18b of the second valve body 18 whose _{movement in the relief valve β valve closing direction is restricted by the end portion of the second vertical groove 3a 3, and the relief valve β is released.} The valve is opened, and the pressure sensitive chamber 13 and thus the secondary side passage 2b are between the opening 11a'formed in the first portion 11a of the tubular member 11 and the second valve seat 16 and the second valve body 18. It communicates with the external environment through a gap, a central hole of the first portion 11a and the second portion 11b of the tubular member 11, the internal space of the spring case 15, and the water leakage detection device 19. As a result, as shown by a large number of arrows in FIG. 3 (b), water in the pressure sensitive chamber 13 and eventually in the secondary side passage 2b flows into the internal space of the spring case 15, and is external via the water leakage detection device 19. It is released to the environment, the secondary pressure is reduced, and damage to the water supply equipment connected to the secondary side passage 2b is prevented.
When the water in the secondary side passage 2b is discharged to the external environment via the water leakage detection device 19, water flow is detected by the pair of electrodes 19c coming into contact with water and energizing, and eventually the relief valve β is opened. The valve is detected.

When the internal pressure of the secondary side passage 2b is low and the relief valve β should be closed, the opening of the relief valve β is detected, so that the relief valve β is immediately detected as leaking. NS. As a result, the relief valve β, and thus the compound valve 1 and the equipment to which the compound valve 1 is attached can be quickly maintained.
The composite valve 1 of FIG. 3A is arranged in a state of being rotated 90 degrees counterclockwise, and the water leakage detection device 19 is directed diagonally downward from the base toward the tip of the composite valve 1 and the groove 19b is provided. If it is directed downward, the drainage can be quickly and reliably detected by the pair of electrodes 19c arranged in the groove 19b by flowing the drainage into the groove 19b regardless of the amount of drainage from the relief valve β. If the detected drainage is the drainage when the relief valve β should be closed, it can be immediately determined that the relief valve β is leaking. Therefore, it is possible to quickly and surely detect the leakage of the relief valve β, and to quickly maintain the relief valve β, and thus the compound valve 1 and the equipment to which the compound valve 1 is attached.
As shown by a broken line in FIG. 3A, a groove 19b'facing the groove 19b across the central axis of the cylinder 19a is formed on the inner surface of the cylinder 19a, and a pair of electrodes 19c extend into the groove 19b'. You may let me. Even when the composite valve 1 of FIG. 3A is arranged in a state of being rotated 180 degrees counterclockwise, the water leakage detection device 19 is directed diagonally downward from the base toward the tip of the composite valve 1 and is grooved. 19b'can be directed downwards. As a result, the degree of freedom in arranging the composite valve 1 or the device to which the composite valve 1 is attached is increased.

As shown in FIGS. 7A and 7C, the drainage portion 15b of the relief valve β formed in the spring case 15 of the composite valve 1 is provided with the O-ring 20 and the quick fastener 21 or with the packing 22. The leak detection device 19 may be retrofitted using the screw 23 or by any other suitable method. A compound valve 1 not provided with a water leakage detection mechanism can be easily provided with a water leakage detection function. Also in this case, as shown in FIGS. 7A and 7B, a groove 19b'facing the groove 19b with the central axis of the tubular body 19a sandwiched is formed on the inner surface of the tubular body 19a, and a pair of electrodes 19c are grooved. If it extends to the inside of 19b', even if the compound valve 1 of FIG. 7 (a) is arranged in a state of being rotated 90 degrees counterclockwise, the water leakage detection device 19 can be installed from the base to the tip near the compound valve. It can be directed diagonally downward and the groove 19b'can be directed downward. As a result, the degree of freedom in arranging the composite valve 1 or the device to which the composite valve 1 is attached is increased.
When the water leakage detection device 19 is retrofitted, the cylinder 19a may be attached to the drainage portion 15b of the relief valve β formed in the spring case 15 of the composite valve 1 so as to be rotatable around the central axis of the cylinder 19a. As shown in FIG. 7, when the tubular body 19a is bent, the direction in which the drainage of the relief valve β is directed can be changed by rotating the tubular body 19a around the central axis. As a result, the degree of freedom in arranging the composite valve 1 or the device to which the composite valve 1 is attached is increased. Further, even when the composite valve 1 of FIG. 7 (a) is arranged in a state of being rotated 90 degrees clockwise, the tubular body 19a is rotated 180 degrees around the central axis as shown in FIG. 7 (d). As a result, the water leakage detection device 19 can be directed diagonally downward from the base near the compound valve toward the tip, and the groove 19b'can be directed downward. As a result, the degree of freedom in arranging the composite valve 1 or the device to which the composite valve 1 is attached is increased.
The pair of electrodes 19c may be replaced with a single temperature sensor or other suitable known water flow detection sensor.

The water leakage detection device according to the present invention is used not only for relief valves but also for various valve devices having a water stopping function such as drain plugs, can body protection valves, drain water drain valves, etc. And it can be detected reliably.

1 Pressure reducing valve 2 Body 2a Primary side passage 2b Secondary side passage 2c Cylinder 2d Diaphragm case 3 Piston head 6 1st valve seat 7 1st valve body 8 1st spring 11 Cylinder body 12 Diaphragm 13 Pressure sensitive chamber 14 2nd spring 15 Spring case 16 2nd valve seat 17 2nd valve body 19 Leakage detection device 19a Cylinder body 19b, 19b'Groove 19c Electrode 20 Ouring 21 Quick fastener 22 Packing 23 Screw α Pressure reducing valve β Relief valve

Claims (6)

A valve device equipped with a cylinder having a pair of grooves extending in the longitudinal direction facing the central axis on the inner surface and a water flow detection sensor arranged in the pair of grooves, and having a water stopping function. A water leak detection device that can be installed. The water leakage detection device according to claim 1, wherein the water leakage detection device is preliminarily incorporated in the valve device. The water leakage detection device according to claim 1, wherein the valve device is retrofitted. The water leakage detection device according to claim 3, wherein the tubular body is rotatably attached to the valve device around the central axis. The water leakage detection device according to any one of claims 1 to 4, wherein the water flow detection sensor is a pair of electrodes fixed to a cylinder and extending from the outside in the radial direction into the groove. The water leakage detection device according to any one of claims 1 to 4, wherein the water flow detection sensor is a single temperature sensor fixed to a cylinder and extending from the outside in the radial direction into the groove. ..

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