JP6349132B2 - Shut-off valve - Google Patents

Description

  The present invention relates to a shut-off valve that shuts off water supply to each door when an earthquake exceeding a predetermined seismic intensity occurs, for example.

  As this type of shut-off valve, a technique described in Patent Document 1 below has been proposed. The shut-off valve of Patent Document 1 includes an annular valve seat in which a communication opening that communicates a primary water supply channel and a secondary water supply channel is formed, and a disc-shaped valve body that opens and closes the communication opening. And a valve mechanism having a shaft serving as a rotation center of the valve body, and the shaft is attached to the center of the valve body. A seal member made of, for example, synthetic rubber is fixed to the inner peripheral surface of the valve stem. Such a valve mechanism part is called a butterfly valve. Further, the shut-off valve of Patent Document 1 includes valve body rotation means for rotating the valve body around the shaft body, and the valve body is rotated by the valve body rotation means to open and close the communication opening.

JP 2012-251656 A

  In the shut-off valve of Patent Document 1, the valve body is rotated around the shaft body by the valve body rotating means, but a seal member is fixed to the inner peripheral surface of the valve base. For this reason, in order to open and close the opening for communication, it is necessary for the valve body rotating means to rotate the valve body in contact with the seal member. In other words, the valve body must be rotated against the frictional force of the seal member and requires a large amount of torque. Therefore, the valve body rotation means needs a driving force corresponding to the torque. there were.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a shut-off valve that can turn a valve body with a smaller torque than conventional ones, and can reduce the driving force of the valve body turning means by that amount.

The shut-off valve of the present invention is a shut-off valve disposed inside a meter box that houses a water meter provided in a water supply path for supplying tap water to each door, and the shut-off valve includes a primary side opening of a fluid supply path and A valve box in which a secondary side opening is formed, a valve body accommodated in the valve box, a shaft body serving as a rotation center of the valve body, a primary side fluid supply path and a secondary side fluid supply inside the valve box The valve body is provided with a valve base having a communication opening communicating with the road, and a valve body rotating means for rotating the valve body around the shaft body. The valve body rotating means detects an earthquake having a predetermined seismic intensity or more. And a control unit for rotating the valve body when the earthquake detector detects an earthquake, the shaft body is attached to the end side of the valve body, and the valve body is connected to the communication opening. A supply posture that is on the primary side and is opened around the shaft body by the valve body rotating means so as to be separated from the communication opening and opened. The valve body can be switched to a supply shut-off posture that is in contact with the closed opening and closed, and the valve body is rotated from the supply posture to the communication opening side around the shaft body by driving the valve body rotating means. It is characterized by being configured to be in a supply cut-off posture.

  In the shut-off valve configured as described above, the shaft body is attached to the end side of the valve body accommodated in the valve box, and the valve body is rotated around the shaft body by the valve body rotating means, A supply posture in which the primary side fluid supply path and the secondary side fluid supply path are communicated by opening the communication opening formed in the valve base, and the primary side fluid supply path and the secondary side fluid by closing the communication opening Since the communication with the supply path is cut off and switched to the non-communication supply cut-off posture, even if the valve body rotates around the shaft body, the valve body and the valve base do not rub, so the valve body and the valve base No frictional force is generated during this period, and the torque required to rotate the valve body is reduced by that amount, and the driving force of the valve body rotating means can be reduced.

  In the shutoff valve of the present invention, the communication opening of the valve base is configured such that the direction away from the shaft body is inclined closer to the primary side opening with respect to the fluid supply direction in which the primary side opening and the secondary side opening are linearly connected. Can be adopted. According to this configuration, the amount of rotation associated with the switching between the supply posture and the supply blocking posture of the valve body is reduced by the amount of the communication opening portion of the valve stem being inclined, and the communication opening portion is set to the fluid supply direction. The length of the valve box can be shortened compared to the case where it is vertical.

  In the shut-off valve of the present invention, the valve body is in a supply posture at a position deviating from the fluid supply path linearly connecting the primary side opening and the secondary side opening, and the shaft body is in a position deviating from the fluid supply path. Can be adopted. By removing the valve body and the shaft body from the fluid supply path as in this configuration, the fluid supply path is free from anything that obstructs the flow of the fluid, so that the pressure loss of the fluid can be suppressed.

  In the shut-off valve of the present invention, the valve body can be provided with an attachment portion to the shaft body, and the attachment portion can be attached to the outer peripheral surface of the shaft body with rattling. Since the attachment portion of the valve body is attached to the shaft body through a slight gap, the valve body can be rattled with respect to the shaft body. Then, when the valve body is in the supply shut-off posture, the communication opening is closed with a degree of freedom to play, so fluid pressure acts on the valve body in the supply shut-off posture, so that the pressure in the direction to close the valve body Is added, and the communication opening is securely closed by the valve body.

  In the shut-off valve of the present invention, the mounting portion of the valve body is mounted with a gap of 0.2 to 0.5 mm on one side between the outer peripheral surface of the shaft body, and the mounting portion is attached to the outer peripheral surface of the shaft body with rattling. Can be adopted. The mounting part of the valve body is attached with a clearance of 0.2 to 0.5 mm on one side between the outer peripheral surface of the shaft body, so that the valve body rotates smoothly around the shaft body, and the communication opening is ensured by the valve body Closed.

  According to the shut-off valve of the present invention, the shaft body is attached to the end portion side of the valve body housed in the valve box, and the valve body is rotated around the shaft body by the valve body rotating means. A supply attitude in which the primary fluid supply path and the secondary fluid supply path are communicated with each other by opening the communication opening formed in the valve stem, and the primary side fluid supply path and the secondary are closed by the communication opening. Since the valve is switched to the supply cutoff posture in which the side fluid supply path is not in communication, the valve body and the valve base do not rub against each other even if the valve body rotates around the shaft body. Thus, no frictional force is generated, and the torque required to rotate the valve body can be reduced accordingly, and the driving force of the valve body rotating means can be reduced.

It is a whole top view of the feed water piping structure showing one embodiment of the present invention. It is a side view of the water supply piping structure. It is a longitudinal cross-sectional view of the shut-off valve in a state where the valve body is opened. It is a longitudinal cross-sectional view of the shut-off valve in a state where the valve body is closed. It is a cross-sectional view of a state where the valve body is opened in the valve box. It is a cross-sectional view of a state in which the valve body is closed in the valve box. It is a figure showing the single-piece | unit structure of the valve body, (a) is a top view, (b) is a rear view, (c) is a front view, (d) is a bottom view. It is a longitudinal cross-sectional view showing the drive mechanism part of the same shut-off valve. It is a top view showing the drive mechanism part. It is a longitudinal cross-sectional view showing the drive mechanism part in the direction orthogonal to the same FIG. It is the YY sectional view taken on the line in FIG. It is a longitudinal cross-sectional view of a state in which a drive mechanism is mounted on the valve box and an electronic component group is mounted on the drive mechanism. It is the whole view which looked at the same water supply piping structure from the downstream. It is a partially broken longitudinal cross-sectional view showing the attachment state of the watertight cover. It is a longitudinal cross-sectional view of the state which assembled | attached the electronic component group to the 2nd case. It is sectional drawing of the valve box showing another embodiment, (a) is a cross-sectional view of the state which the valve body opened in the valve box, (b) is a longitudinal cross-sectional view of the state which the valve body opened.

  Hereinafter, an embodiment of a shutoff valve of the present invention will be described with reference to the drawings. The shutoff valve according to the present embodiment is an emergency shutoff valve that shuts off water supply (an example of fluid) to each door when an earthquake exceeding a predetermined seismic intensity occurs. First, with reference to FIG. 1 thru | or FIG. 4, the schematic structure of the water supply piping structure 2 provided with the cutoff valve 1 is demonstrated.

  The water supply piping structure 2 includes a meter box 3, a stop cock portion 5 disposed in the meter box 3, and a shutoff valve 1. At the center 4 of the tap water in the meter box 3 in the direction of the virtual flow path (horizontal straight line shown by the one-dot chain line in FIGS. 1 to 4), the stop cock 5 is disposed closer to the primary side (upstream side) and shut off. The valve 1 is disposed closer to the secondary side (downstream side). Further, a water meter 6 is disposed between the stop cock 5 and the shutoff valve 1.

  The meter box 3 includes a rectangular bottom wall 3A in plan view and side walls 3B standing from four sides of the bottom wall 3A. The bottom wall 3A and the side wall 3B are integrally formed. The upper part of the meter box 3 is opened, and in FIG. 2, the longitudinal direction L of the meter box 3 which is the direction 4 of the virtual flow path direction and the short direction of the meter box 3 which is the horizontal direction orthogonal to the virtual flow path direction center 4 Both S are expanded downward.

  An upstream opening 8 through which the inflow pipe 7 is inserted is formed in the upstream side wall 3 </ b> B of the meter box 3. A downstream opening 10 through which the outflow pipe 9 is inserted is formed in the side wall 3B on the downstream side of the meter box 3. The upstream opening 8 has a larger diameter than the inflow pipe 7 in order to connect a primary pipe (not shown). The downstream opening 10 is formed with a larger diameter than the outflow pipe 9 in order to connect the secondary pipe.

  The inflow pipe 7, the outflow pipe 9, the stop cock 5, the water meter 6, and the shutoff valve 1 are arranged at the center in the short direction S of the meter box 3. Further, the inflow pipe 7, the stop cock 5, the water meter 6, and the virtual flow path direction center 4 of the valve box 11 are set to be substantially horizontal. The stop cock 5 is supported on the bottom wall 3A via a base 12, and the water meter 6 is placed directly on the bottom wall 3A or slightly floated from the bottom wall 3A. Inside the meter box 3, an inflow pipe 7, a stop cock 5, a water meter 6, a shut-off valve 1 and an outflow pipe 9 are connected to form a fluid supply path (hereinafter referred to as “water supply path”) 14. Is formed.

  The inflow pipe 7 and the stop cock 5 are connected via a joint 15, the stop cock 5 and the water meter 6 are connected via a joint 16, and the water meter 6 and the shut-off valve 1 are joints The shut-off valve 1 and the outflow pipe 9 are connected via a joint 18.

  Here, the configuration of the shutoff valve 1 will be described. The shut-off valve 1 includes a valve mechanism 71 and a valve body rotating means 72. As shown in FIGS. 3 to 6, the valve mechanism 71 includes a valve box 11 that is a part of the water supply pipe, a valve base 73 that is housed in the valve box 11, and a valve body 13 that is housed in the valve box 11. And a valve shaft 19 that is a shaft body that extends from the inside of the valve box 11 to the outside and is connected to the valve body 13. 3 and FIG. 4 is a cross-sectional view taken along the line AA in FIGS. 5 and 6. The water supply pipe is also referred to as a water pipe, and in this embodiment, the shutoff valve 1 is described as being installed in the water supply pipe in the meter box 3.

  In the valve box 11, a primary side opening 74 is formed at the primary side end of the water supply passage 14, and a secondary side opening 75 is formed at the secondary side end. The water supply path 14 is set on the virtual flow path direction center 4. In the valve box 11, a valve body accommodating portion 76 that is expanded in diameter with respect to the primary side portion and the secondary side portion is formed between the primary side end and the secondary side end that are in the middle of the water supply channel 14. . The valve body 13 is accommodated in the valve body accommodating part 76, and is arrange | positioned with respect to the valve stand 73 (communication opening part 77) at the primary side.

  The valve base 73 is formed in an annular shape, and is fitted on the inner peripheral surface of the secondary side opening 75 near the valve body housing portion 76 via a seal member m9. A communication opening 77 located on the water supply channel 14 is formed at the center of the valve base 73. The communication opening 77 is disposed inside the valve box 11 so as to pass through the virtual flow path direction center 4. Specifically, the center of the communication opening 77 coincides with the virtual flow path direction center 4 in a side view, and the center of the communication opening 77 is displaced with respect to the virtual flow path direction center 4 in a plan view. Has been.

  A secondary side opening 75 is disposed on the downstream side of the communication opening 77, and a valve body accommodating portion 76 is disposed on the upstream side of the communication opening 77. An annular surface of the valve base 73 on the side of the valve body accommodating portion 76 is a valve seat surface on which the valve body 13 is detached and attached. Hereinafter, this valve seat surface is referred to as a primary side surface 78. The primary side surface 78 is disposed in a direction substantially orthogonal to the virtual flow path direction center 4.

  The valve shaft 19 is an axis extending in the vertical direction, and a pair of cylinders spaced apart in the vertical direction are provided near the secondary side in the valve body housing portion 76 so as to externally fit and support the valve shaft 19 at the upper and lower portions thereof. Shaped bulges 79 and 80 are formed. As shown in FIGS. 5 and 6 (planar sectional views), the bulging portions 79 and 80 are arranged so as to be displaced from one side in the direction orthogonal to the virtual flow path direction center 4 from the virtual flow path direction center 4. Has been. For this reason, the valve shaft 19 supported by the bulging portions 79 and 80 is disposed so as to be displaced from the virtual flow path direction center 4. Therefore, at least a portion of the valve body 13 supported by the valve shaft 19 that is attached to the valve shaft 19 is displaced from the virtual flow path direction center 4. The valve shaft 19 is inserted into the upper bulging portion 79 via a seal member m10.

  As shown in FIGS. 7A, 7B, 7C, and 7D, the valve body 13 is fitted in a fitting portion 81 that is an attachment portion to the valve shaft 19 and in a lateral direction away from the valve shaft 19. And a valve main body 82 extending integrally with the portion 81. In other words, the fitting portion 81 is formed at the end of the valve body 82. The fitting portion 81 is attached so as to be externally fitted to a peripheral surface of a portion of the valve shaft 19 exposed between the upper and lower bulging portions 79 and 80 (for example, see FIG. 3). A mounting hole 81 a is formed on the side surface of the fitting portion 81, and a shaft-shaped fixing member 86 is inserted into the mounting hole 81 a, and the distal end side portion of the fixing member 86 extends from the side of the valve shaft 19 to the valve shaft. 19 is inserted.

  The fitting portion 81 is fitted to the outer peripheral surface of the valve shaft 19 via a slight gap, and the outer peripheral surface of the fixing member 86 and the peripheral surface of the mounting hole 81a have a slight gap. . Thus, the valve main body 82 is configured to be able to rattle against the valve shaft 19. As a specific amount of the gap, it is preferable to leave 0.2 to 0.5 mm on one side.

  The valve body 82 includes a valve portion 83 formed integrally with the fitting portion 81. The valve part 83 is formed in a substantially disk shape. The valve main body 82 further includes a packing 84 fixed to one side surface of the valve portion 83. The packing 84 is formed in a substantially disk shape, and an annular contact portion 84a that can contact the primary side surface 78 of the valve base 73 bulges and is integrally formed on the outer peripheral portion.

  The valve body 82 rotates around the valve shaft 19 together with the fitting portion 81, whereby a supply posture (hereinafter referred to as “water supply posture”) W <b> 1 that opens the communication opening 77 of the valve base 73, and the fitting portion 81. At the same time, by rotating around the valve shaft 19, the communication opening 77 of the valve stem 73 is closed, and the contact blocking portion 84 a of the packing 84 contacts the primary side surface 78 (hereinafter referred to as “water supply blocking posture”). ) It is possible to switch to W2.

  The water supply posture W <b> 1 is a posture along the virtual flow path direction center 4 at a position where the valve body 82 of the valve body 13 deviates from the virtual flow path direction center 4. In the water supply blocking posture W2, the valve body 82 held in the water supply posture W1 rotates about the valve shaft 19 in a direction substantially orthogonal to the virtual flow path direction center 4 by driving the valve body rotating means 72. Thus, the communication opening 77 is closed.

  As shown in FIG. 5, the valve main body 82 is disposed so as to be displaced toward the virtual flow path direction center 4 side with respect to the center line of the valve shaft 19 in the water supply posture W1. For this reason, the valve box 11 includes a permissible region 85 that allows the water supply posture W1 of the valve main body 82. As described above, the valve main body 82 is disposed so as to be displaced with respect to the center line of the valve shaft 19, whereby the valve main body 82 can close the communication opening 77 in the water supply cutoff posture W2.

  As shown in FIGS. 3 and 4, the valve body rotation means 72 includes a drive mechanism section 20 for rotating the valve body 13 in the valve box 11 via the valve shaft 19, and the drive mechanism section 20. And an electronic component group 21 having a plurality of electronic components.

  The drive mechanism 20 is housed (assembled) inside the first case 22 so that the drive mechanism 20 and the first case 22 are a unit. The electronic component group 21 is housed (assembled) inside a second case 23 that is separate from the first case 22, and the electronic component group 21 and the second case 23 form a unit. ing. In other words, the electronic component group 21 is a unit using the second case 23. The first case 22 is disposed on the valve box 11 side, and the second case 23 is detachably attached to the upper surface of the first case 22.

  As shown in FIGS. 8 to 11, the first case body 24 in the first case 22 includes a bottom wall 25 that is rectangular in plan view, and a side wall 26 that is erected from four sides of the bottom wall 25. Thus, it is formed in a rectangular parallelepiped shape with the upper portion as an open portion 27. The opening 27 is covered with a plate-like lid 28. The first case body 24 and the lid body 28 are assembled through a seal member m1. The bottom wall 25 is placed on the upper surface 11a of the valve box 11, and the first case 22 is placed on the upper surface 11a by a bolt B1 inserted from the inside of the first case 22 into the bottom wall 25 and the upper surface 11a of the valve box 11. It is detachably attached. The bottom wall 25 and the upper surface 11a are attached via a seal member m2. As shown in FIG. 10, an insertion hole 29 through which the valve shaft 19 is inserted is formed in the bottom wall 25.

  The lid 28 is formed in a rectangular shape, and includes a rectangular receiving plate 30 and a support frame 34 erected from four sides. As shown in FIG. 8, the receiving plate 30 is formed with a fitted portion 32 into which a fitting portion 31 of a second case 23 described later is fitted. The fitted portion 32 is disposed on one side of the lid body 28 (on the right side in FIG. 8). The fitted portion 32 is formed in a cylindrical shape, and is formed so as to protrude downward and upward with respect to the plate surface of the lid body 28. A driven bevel gear 33 that is a driven transmission portion is disposed directly below the fitted portion 32. A seal member m <b> 3 is fitted to the outer peripheral surface portion of the support frame 34.

  The configuration of the drive mechanism unit 20 will be described with reference to FIGS. The drive mechanism unit 20 includes a gear mechanism 35 having a driven bevel gear 33, a worm 36 coupled to the gear mechanism 35, a helical gear 37 meshing with the worm 36, and a clutch mechanism 38 coupled to the worm 36.

  The gear mechanism 35 includes a driven bevel gear 33 and a plurality of spur gears 39 for changing the gear ratio of the driven bevel gear 33. The driven bevel gear 33 rotates around the central axis in the direction along the short direction S, which is a direction orthogonal to the virtual flow path direction center 4, and the shaft portion 40 is a spur gear. One spur gear 39 is configured to mesh with the shaft portion 40. The worm 36 is externally fitted and fixed to a main shaft 41 whose longitudinal direction is the short direction S. The worm 36 is disposed in the middle of the main shaft 41 in the axial direction.

  A plurality of support columns 42 are erected from the upper surface of the bottom wall 25 of the first case 22, and a bottom wall 43 </ b> A of a bracket 43 having a U-shaped cross section with the upper side open is supported by the support column 42. Both ends of the main shaft 41 in the axial direction are rotatably supported by the vertical wall 43B of the bracket 43. The helical gear 37 rotates around the valve shaft 19 and is formed in a fan shape in plan view.

  The clutch mechanism 38 is connected to the front end side of the main shaft 41 (the end side opposite to the gear mechanism 35). In the main shaft 41, a handle shaft 45 to which a manual operation handle 44 (see FIG. 13) is connected is further connected to the distal end side of the clutch mechanism 38. The handle shaft 45 is fitted in the side wall 26 of the first case 22 in a mounting portion 46 formed so as to protrude in the short direction S, and a seal member m4 is provided in the middle of the handle shaft 45 in the axial direction. It is fitted.

  In the present embodiment, the attachment portion 46 is formed so as to protrude from the side wall 26 of the first case 22, the handle shaft 45 is disposed at a deep position of the attachment portion 46, and the handle portion of the manual operation handle 44 is It is inserted into the mounting portion 46. With this configuration, the handle portion of the manual operation handle 44 and the connecting portion of the attachment portion 46 can be protected from gravel and mud, and the handle portion of the manual operation handle 44 is inserted into the attachment portion 46 so that the attachment portion can be protected. 46 becomes a guide, and the manual operation handle 46 can be smoothly rotated.

  A manual operation handle 44 that can rotate the handle shaft 45 outside the first case 22 is fixed to the handle shaft 45. And even if it is manual, it is comprised so that the valve body 13 can be opened via the clutch mechanism 38 by rotating the manual operation handle 44 to a predetermined rotation direction. Alternatively, the clutch mechanism 38 can be omitted, and the valve body 13 can be opened and closed by rotating the handle valve body 13.

  As shown in FIG. 10, the upper part of the valve shaft 19 is inserted into the insertion hole 29, and a seal member m <b> 5 is externally fitted to an intermediate portion in the axial direction of the valve shaft 19 that is inserted into the insertion hole 29. In the valve shaft 19, the portion inserted through the insertion hole 29 and inserted into the first case 22 is formed such that the upper portion has a smaller diameter than the lower portion via the stepped surface 19 a.

  The central portion of the helical gear 37 is inserted up to the stepped surface 19a, and the helical gear 37 is secured from the valve shaft 19 by retaining means. The retaining means includes an arm-shaped pressing member 47 extending over the upper surface of the valve shaft 19 and the upper surface of the helical gear 37, and a mounting bolt 48 for fixing the pressing member 47 to the upper end surface of the valve shaft 19. A mounting bolt 48 is inserted through the presser member 47 and screwed into the upper end surface of the valve shaft 19.

  As shown in FIG. 9, the pressing member 47 is formed in a hook shape extending in a horizontal plane (upper side of the main shaft 41) without contacting the main shaft 41 and the worm 36. The pressing member 47 is configured to be rotatable together with the helical gear 37 around the center of the helical gear 37 (which is also the center of the valve shaft 19) within a range where the tooth portion 37A is formed. More specifically, as will be described later, it is configured to be rotatable within a range in which the tooth portion 37A is formed within the time for driving the DC motor 49. A permanent magnet M is attached to the top surface of the tip of the pressing member 47.

  As shown in FIGS. 12, 14, and 15, the second case 23 is formed in a rectangular parallelepiped shape. The second case 23 is detachably attached to the lid 28 of the first case 22. The second case 23 includes a bottom wall 23A that is rectangular in plan view and a covering 50 that covers the bottom wall 23A from above. The bottom wall 23A and the covering body 50 are assembled via a seal member m6. On the bottom wall 23A, the fitting portion 31 that fits in the fitted portion 32 is formed. The fitting portion 31 is formed in a cylindrical shape and protrudes downward with respect to the wall surface of the bottom wall 23A. A seal member m7 is fitted on the outer peripheral surface of the fitting portion 31. In the center of the bottom wall 23A surrounded by the fitting portion 31, an insertion hole 52 through which a drive shaft 51A of a drive bevel gear 51, which is a drive transmission portion described later, is inserted is formed. The drive shaft 51A is an axis along the vertical direction.

  The electronic component group 21 is housed in the second case 23, and includes, as electronic components, a DC motor 49 and two batteries for supplying power to the DC motor 49 (storage batteries that are not supplied with power from outside) 55, 55. And a set of controls having a function of controlling power supply from the batteries 55 and 55 to the DC motor 49 by the input of the seismic intensity signal from the seismic detector. And a substrate (not shown). Although not shown, the control board is disposed between the batteries 55 and 55 and the back side wall of the second case 23 so as to stand upright along the batteries 55 and 55.

  The drive transmission unit includes a drive bevel gear 51 and a DC motor 49. Furthermore, the second case 23 includes a magnetic sensor that reacts with the magnetic force of the permanent magnet M and an LED. This magnetic sensor detects that the presser member 47 has rotated when it corresponds to the permanent magnet M in the vertical direction. In order to notify the open / close state of the valve body 13 by this detection, a lighting or blinking signal is output to the LED via the control circuit of the control board.

  Among these electronic components, the DC motor 49 is not restricted in terms of the arrangement of other electronic components, although it is regulated to be arranged above the driven bevel gear 33. In the present embodiment, the DC motor 49, the batteries 55 and 55 (control board), and the earthquake detector 53 are arranged in the lateral direction S in this order. However, the order of arrangement of the electronic components and the arrangement position in the vertical direction are not particularly limited.

  As shown in FIG. 13, the second case 23 is covered with a watertight cover 56 from above in order to ensure watertightness for the electronic component group 21. That is, the water-tightness with respect to the electronic component group 21 is ensured by the double sealing between the second case 23 and the water-tight cover 56. The watertight cover 56 is formed in a box shape with the lower side opened. The four side walls 56B of the watertight cover 56 are configured to be fitted to the seal member m3 fitted to the support frame 34 of the lid 28 from the outside.

  As shown in FIG. 14, the watertight cover 56 includes a top wall 56 </ b> A, and the back surface of the top wall 56 </ b> A is the second case 23 when the watertight cover 56 is fitted to the support frame 34 of the lid 28. It is comprised so that it may contact | abut on an upper surface. Further, the watertight cover 56 is provided with an attachment rod 57 for fixing it so as not to be easily removed (not removed) from the support frame 34 unexpectedly. The mounting rod 57 passes through the outside of the second case 23 inside the watertight cover 56 and is screwed into the first case 22 (for example, the receiving plate 30).

  Thus, the second case 23 is mounted so as to be pressed against the first case 22 by the watertight cover 56. The head of the mounting rod 57 is a rotationally operated portion 57A, and is rotated using the manual operation handle 44 indicated by the phantom line in FIG. 14 as a tool. In the rotationally operated portion 57A, a seal member m8 is externally fitted to a part inserted through the top wall 56A.

  On the top wall 56A of the watertight cover 56, a cover wall 60 is formed so as to protrude upward. Normally, the cover 61 is covered with a cap 61 to conceal the rotationally operated portion 57A. Conversely, when removing the attachment rod 57, the cap 61 is removed, the manual operation handle 44 is removed from the handle shaft 45 and used as a tool, and the attachment rod 57 is rotated to remove it.

  Such valve body rotation means 72 includes holding means for holding the valve body 13 in the water supply posture W1 and the water supply cutoff posture W2. Specifically, the holding means includes a worm 36 and a helical gear 37 that meshes with the worm 36. In other words, the helical gear 37 is engaged with the worm 36. In other words, the rotation of the helical gear 37 around the valve shaft 19 is regulated by the worm 36. Conversely, when the worm 36 rotates, the helical gear 37 rotates around the valve shaft 19.

  The operation of the shutoff valve 1 in a state where the shutoff valve 1 is arranged in the meter box 3 in the above configuration will be described. In a normal time before the occurrence of the earthquake, as shown in FIGS. 3 and 5, the valve body 13 opens so as to open the communication opening 77 of the valve base 73, which is the water supply channel 14 inside the valve box 11. ing. That is, the valve body 13 is in the water supply posture W <b> 1 and is along the virtual flow path direction center 4 at a position where the valve main body 82 deviates from the virtual flow path direction center 4. In the water supply posture W1 of the valve body 13, water can be supplied to each door, the drive mechanism 20 in the water supply posture W1 of the valve body 13 is in the state shown in FIG. 9, and the helical gear 37 is centered around the valve shaft 19. In this state, the presser member 47 is also rotated clockwise about the valve shaft 19.

  In the shutoff valve 1 of the present embodiment, the fitting portion between the valve shaft 19 and the bottom wall 25 of the first case 22, the assembly portion of the first case body 24 and the lid 28, the support frame 34 and the watertight cover. 56, a fitting portion between the ceiling wall 56A of the watertight cover 56 and the mounting rod 57, and an assembling portion of the bottom wall 23A of the second case 23 and the covering 50 are respectively provided with a sealing member m1. -M10 are provided. Thus, since different members are attached via the seal member, even if rainwater or the like has entered into the meter box 3, water intrusion into the drive mechanism unit 20 or the electronic component group 21, Unexpected water intrusion into the valve box 11 is suppressed.

  The valve shaft 19 is disposed so as to be displaced from the virtual flow path direction center 4. Further, the valve body 13 in the water supply posture W1 is arranged so as to be displaced from the virtual flow path direction center 4. Since the valve body 13 and the valve shaft 19 are removed from the virtual flow path direction center 4 (water supply path) as in this configuration, the water supply path 14 can be kept to a minimum with the obstacles for water supply, so the pressure loss of the water supply Is suppressed.

  When an earthquake of a predetermined seismic intensity or more occurs, the seismic detector 53 detects this, and when the seismic intensity signal is output to the control circuit of the control board, the control circuit inputs the seismic intensity signal from the seismic detector 53. Thus, power is supplied from the batteries 55 and 55 to the DC motor 49. Then, the DC motor 49 is driven, the driving bevel gear 51 rotates around its axis, and the driven bevel gear 33 meshed with the driving bevel gear 51 rotates around the shaft portion 40 and meshes with the shaft portion 40. The spur gear 39 is rotated about its axis, and the main shaft 41 connected to the spur gear 39 and the worm 36 fitted around the main shaft 41 are rotated about the axis.

  Then, the helical gear 37 meshed with the worm 36 rotates, the valve shaft 19 connected to the helical gear 37 rotates about its axis, and the valve body 82 of the valve body 13 in the water supply posture W1 The water supply blocking posture W2 is brought into contact with the primary side surface 78 of the base 73 and the communication opening 77 is closed. Specifically, when the valve shaft 19 is rotated, the valve portion 83 of the valve main body 82 is rotated together with the valve shaft 19 together with the fitting portion 81 which is an attachment portion of the valve main body 82 to the valve shaft 19. Then, the contact portion 84 a of the packing 84 fixed to one surface of the valve portion 83 contacts the primary side surface 78 of the valve base 73, and the communication opening 77 is closed by the contact portion 84 a of the packing 84.

  In the water supply cutoff posture W2, as shown in FIGS. 4 and 6, the primary side fluid supply path (hereinafter referred to as “primary side water supply path”) and the secondary side fluid supply path in the water supply path 14 via the valve body 82. (Hereinafter referred to as “secondary water supply channel”) is disconnected, and water supply in the valve box 11 is shut off. That is, water supply to each door is interrupted. The driving of the DC motor 49 is, for example, controlled by a timer, and is set so that the valve body 13 assumes the water supply cutoff posture W2 when the driving is continued for a predetermined time.

  When the valve shaft 19 is rotated, the presser member 47 fixed to the valve shaft 19 is rotated counterclockwise around the axis of the valve shaft 19, and the LED is turned on or flashes. The state where the water supply in is interrupted is notified. In this case, the LED notification is detected by a magnetic sensor.

  As described above, the valve body 13 rotates around the valve shaft 19 attached to the end side of the valve body 13 when switching from the water supply posture W1 to the water supply cutoff posture W2. When the valve body 13 is switched to the water supply cutoff posture W <b> 2, the valve body 13 operates to contact the primary side surface 78 of the valve base 73 and close the communication opening 77. That is, when the posture of the valve body 13 is switched, the valve body 13 does not rub (slide) with other members.

  For this reason, less power is required for driving the valve body rotating means 72, which is the torque for driving the valve body 13. Further, the valve body 13 receives a water supply pressure (fluid pressure) in the middle of switching from the water supply posture W1 to the water supply cutoff posture W2. By adding this water supply pressure in the direction in which the valve main body 82 is set to the water supply cutoff posture W2, the torque for rotating the valve body 13 can be further reduced.

  In the shut-off valve 1, when the valve body 13 is switched from the water supply posture W1 to the water supply cut-off posture W2, the valve body 13 and the valve shaft 19 only rotate within the valve box 11, and the valve box 11 (water supply channel) 14) There is no member inserted in. That is, the shut-off valve 1 is not configured to close the communication opening 77 of the valve base 73 against the pressure difference between the atmospheric pressure and the water pressure inside the valve box 11, so that the valve body 13 is affected by the water pressure. There is nothing. Also from this, the torque for rotating the valve body 13 can be reduced.

  The fitting portion 81 is attached to the valve shaft 19 through a slight gap. As described above, the valve body 13 is attached to the valve shaft 19 through a slight gap so that the valve body 13 can rattle against the valve shaft 19. If it becomes so, when the valve body 13 will be in the water supply interruption | blocking attitude | position W2, the communication opening part 77 will be closed with the degree of freedom which is only loose. For this reason, when the feed water pressure is applied to the valve body 13 in the feed water shutoff posture W2, the communication opening 77 is reliably closed by the valve body 13, and the feed water can be reliably shut off.

  By the way, in this kind of shut-off valve 1, there exists a request | requirement of replacing | exchanging electronic components regularly. In the shut-off valve 1 of the present embodiment, in particular, the electronic component group 21 can be replaced as a cartridge. That is, the cap 61 is removed from the cover wall 60 of the watertight cover 56, the manual operation handle 44 (tool) is mounted on the rotation operated portion 57A, and the mounting rod 57 is rotated to remove the mounting rod 57. After doing so, the watertight cover 56 is removed from the first case 22. Then, since the second case 23 is exposed, the fitting portion 31 is removed from the fitted portion 32 so as to grasp and pull up the second case 23. Then, the driven bevel gear 33 that is the driven transmission portion and the drive bevel gear 51 that is the drive transmission portion are disengaged, and the electronic component group 21 can be removed from the drive mechanism portion 20 together with the second case 23.

  According to the shutoff valve 1 of the present embodiment, a plurality of electronic components are combined into a unit in the form of an electronic component group 21, and the electronic component group 21 and the drive mechanism unit 20 are connected via a drive transmission unit. Since it is only connected, the electronic component group 21 can be handled collectively with respect to the drive mechanism part 20, and the removal of the electronic component group 21 with respect to the drive mechanism part 20 can be performed very easily.

  In order to mount the new electronic component group 21 on the drive mechanism unit 20, the electronic component group 21 is placed in the second case so that the drive bevel gear 51 of the electronic component group 21 meshes with the driven bevel gear 33. 23 may be attached to the first case 22 (drive mechanism unit 20).

  Furthermore, in this embodiment, it is easy to remove the drive mechanism unit 20 from the valve box 11. Specifically, referring to FIG. 10, after the electronic component group 21 is removed from the drive mechanism section 20 as described above, the lid 28 of the first case 22 is removed and the first case 22 is opened. Then, since the mounting bolt 48 is exposed, the mounting bolt 48 and the bolt B1 are removed, and the first case 22 is pulled up. Then, the valve shaft 19 is pulled out from the helical gear 37 and the bottom wall 25 (insertion hole 29), and the drive mechanism 20 can be removed from the valve box 11 together with the first case 22.

  In this way, for example, maintenance of the drive mechanism unit 20 can be performed. Alternatively, when the drive mechanism unit 20 is replaced, the bolt B1 is inserted and tightened from the inside of the first case 22 to the bottom wall 25 and the upper surface 11a of the valve box 11, and the bottom wall 25 of the first case 22 is inserted. The valve shaft 19 is inserted into the hole 29, the upper end side of the valve shaft 19 is inserted into the center of the helical gear 37, the presser member 47 is placed on the upper end surface of the valve shaft 19, and the valve shaft 19 and the helical gear 37 are mounted by the mounting bolts 48. , And the pressing member 47 are integrated, the drive mechanism 20 can be attached to the upper surface of the valve box 11 together with the first case 22.

  According to the shutoff valve 1 of the present embodiment, the drive mechanism unit 20 is a unit, and the drive mechanism unit 20 and the valve shaft 19 are only connected by the mounting bolts 48. The mechanism unit 20 can be attached and detached very easily.

  The shut-off valve of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. In the above embodiment, the primary side surface 78 of the valve platform 73 has been described in the case where it is arranged in a direction substantially orthogonal to the virtual flow path direction center 4. However, as shown in FIGS. 16A and 16B, the primary side surface 78 of the valve stem 73 can be set to be inclined with respect to the virtual flow path direction center 4.

  Specifically, the primary side surface 78 is an annular inclined plane that inclines the end portion far from the valve shaft 19 toward the upstream side. By inclining the primary side surface 78, the communication opening 77 is inclined with respect to the virtual flow path direction center 4 connecting the primary side opening 74 and the secondary side opening 75. The water supply cutoff posture W <b> 2 of the valve body 13 is a posture in contact with the inclined primary side surface 78. According to this configuration, the amount of rotation of the valve body 13 can be reduced by the amount by which the primary side surface 78 is inclined. Thereby, it becomes possible to shorten the length (inter-surface distance) of the valve box 11 in the longitudinal direction.

  In the said embodiment, the valve body 13 demonstrated the structure rotated around the valve shaft 19 along a perpendicular direction (up-down direction). However, although not shown, the valve shaft is arranged in a horizontal direction perpendicular to the center of the virtual flow path direction at a position deviating upward from the virtual flow path direction center, and the valve body is rotated around the valve shaft. By making it, it can comprise so that it may switch to a water supply attitude | position and a water supply interruption | blocking attitude | position. In such a configuration, the primary side surface of the valve stem may be disposed in a direction substantially orthogonal to the virtual flow path direction center, or the primary side surface is set to be inclined with respect to the virtual flow path direction center. It is also possible. The primary side surface is configured to be inclined so that the lower side is positioned on the upstream side. And in the water supply interruption | blocking attitude | position W2, since the weight of valve body itself acts on the primary side surface 78, the communication opening part 77 can be closed reliably.

  In the above embodiment, the virtual flow path direction center 4 in the feed water flow direction (fluid supply direction) is shown when the primary side opening 74 and the secondary side opening 75 are connected in a straight line. However, in this shutoff valve 1, a configuration in which the feed water flow direction is changed vertically in the middle of a horizontal flow is also conceivable. In this case, the virtual flow path direction center 4 also extends from the horizontal direction to the vertical direction, and the communication opening 77 is opened upward. That is, the communication opening 77 is configured along the horizontal direction.

  Further, the virtual flow path direction center 4 in the feed water flow direction is not limited to being along the vertical direction in the middle of the horizontal flow, but may be inclined relative to the horizontal (vertical). In any case, the communication opening 77 is configured to open in a direction perpendicular to the feed water flow direction. Therefore, the communication opening 77 can be opened in any direction between the horizontal direction and the vertical direction, and the water supply posture W1 and the water supply cutoff posture W2 of the valve body 13 are in accordance with the opening direction of the communication opening 77. Can be decided.

  The valve body rotation means 72 is not limited to the above configuration. In the above embodiment, the valve body rotating means 72 includes the worm 36 and the helical gear 37 meshing with the worm 36, and the helical gear 37 is rotated by driving the DC motor 49 to rotate the worm 36. The body 13 was configured to rotate. However, although not shown, for example, a valve body rotating means that rotates the valve shaft using a rack and pinion mechanism is conceivable. In this case, a rack and pinion mechanism is used as the holding means. In addition, the configuration is not limited to the configuration in which the valve shaft is driven electrically. For example, a configuration in which a spring (spring) is used as a drive source for rotating the valve shaft is also conceivable.

In the above embodiments, the shut-off valve has been described as an emergency shut-off valve. Here, as a reference example , the shut-off valve is not limited to an emergency shut-off valve. For example, a shut-off valve (from a temporary one for replacement or maintenance to a continuous purpose such as a water stop or a waste plug) Or a stop valve, a gate valve, a gate valve, a backflow prevention valve, and the like.

In each of the above embodiments, the case where the shut-off valve 1 is arranged in the water supply pipe in the meter box 3 has been described. Here, as a reference example , the shut-off valve 1 can be installed at an appropriate location on the water supply pipe (water pipe) between the water pipe and the faucet of each door. For example, the shut-off valve 1 can be installed on a pipe shaft installed in an apartment (or factory, hospital, etc.). The pipe shaft is arranged in the horizontal direction or in the vertical direction.

  In order to apply the shut-off valve 1 to the pipe shaft, the shut-off valve 1 is arranged so that the longitudinal direction of the shut-off valve 1 is perpendicular to the pipe shaft in the vertical plane, as in the above embodiment. The pipe shaft can be detached from the drive mechanism section 20 by pulling the parts group 21 together with the second case 23 or mounted on the drive mechanism section 20 together with the second case 23 from the front. Install the shut-off valve 1 in By doing so, the drive mechanism unit 20 is pulled together with the first case 22 from the pipe shaft, or the drive mechanism unit 20 is installed together with the first case 22 on the pipe shaft from the front. it can.

In each of the above-described embodiments, the valve detector 13 is configured to change from the water supply posture W1 to the water supply cutoff posture W2 by detecting an earthquake using the earthquake detector 53 that detects an earthquake having a predetermined seismic intensity or more. As the seismic detector 53, a seismic device, an acceleration sensor, or the like is used, and by detecting a predetermined seismic intensity or acceleration, the valve body 13 is changed from the water supply posture W1 to the water supply cutoff posture W2. Herein as reference example, the present invention, by detecting the earthquake, can also be a valve body 13 from the water supply position W1 and configured to feed water shut-off position W2.

  For example, when tap water exceeds a predetermined flow rate due to pipe breakage of the water pipe (including the inside of the meter box 3 and others) or abnormality of equipment such as a water pump (not shown), this is detected by a flow sensor. Then, it is conceivable to configure the valve body 13 from the water supply posture W1 to the water supply cutoff posture W2. Alternatively, when tap water exceeds a predetermined pressure due to abnormality of equipment such as a valve or a water supply pump arranged on the primary side with respect to the meter box 3, this is detected by a pressure sensor, and the valve body 13 is supplied with water. It can be considered that the posture is changed from the posture W1 to the water supply cutoff posture W2. Furthermore, when the tap water exceeds a predetermined temperature due to an abnormality in the equipment, it is possible to detect this by a temperature sensor and to configure the valve body 13 from the water supply posture W1 to the water supply cutoff posture W2. It is done.

In each of the above embodiments, tap water is given as an example of the fluid, and the shutoff valve 1 configured to shut off the tap water supply is given as an example. Here, as a reference example , the present invention is not limited to the shutoff valve 1 that shuts off the tap water supply, but can also be applied as a shutoff valve that shuts off other fluids. Examples of the liquid that is other fluid include industrial water, fuel oil, soft drinks, and liquid medicines, and examples of the gas that is a fluid include water vapor, compressed air, fuel gas, and medical gas.

  DESCRIPTION OF SYMBOLS 1 ... Shut-off valve, 2 ... Water supply piping structure, 3 ... Meter box, 4 ... Virtual flow direction center, 5 ... Stop cock part, 6 ... Water meter, 7 ... Inflow pipe, 8 ... Upstream opening, 9 ... Outflow Pipes, 10 ... downstream opening, 11 ... valve box, 13 ... valve body, 14 ... water supply channel, 19 ... valve shaft, 36 ... worm, 37 ... helical gear, 71 ... valve mechanism, 72 ... valve body rotating means, 73 ... Valve base, 74 ... Primary side opening, 75 ... Secondary side opening, 76 ... Valve body housing part, 77 ... Communication opening part, 78 ... Primary side surface, 81 ... Fitting part, 82 ... Valve body, 83 ... Valve Part, 84 ... packing, 84a ... contact part, L ... longitudinal direction, S ... short direction, W1 ... water supply posture, W2 ... water supply cutoff posture

Claims (5)

It is a shut-off valve that is arranged inside a meter box that houses a water meter provided in a water supply channel that supplies tap water to each house,
The shut-off valve includes a valve box formed with a primary side opening and a secondary side opening of a fluid supply path, a valve body housed in the valve box, a shaft body serving as a rotation center of the valve body, and a valve box A valve base in which a communication opening for communicating the internal primary side fluid supply path and the secondary side fluid supply path is formed; and a valve body rotating means for rotating the valve body around the shaft body,
The valve body rotating means includes an earthquake detector that detects an earthquake with a predetermined seismic intensity or higher, and a control unit that rotates the valve body when the earthquake detector detects an earthquake,
The shaft body is attached to the end side of the valve body, and the valve body is on the primary side with respect to the communication opening, and the valve body is rotated around the shaft body by the valve body rotation means so as to be separated from the communication opening. It is possible to switch between a supply posture with the opening and a supply cut-off posture that abuts the communication opening and closes it,
A shut-off valve, wherein the valve body is configured to be in a supply shut-off posture by rotating from a supply posture to a communication opening side around a shaft body by driving of a valve body rotating means.   The shutoff valve according to claim 1, wherein the communication opening of the valve base is inclined closer to the primary side opening toward the fluid supply direction in which the primary side opening and the secondary side opening are linearly connected.   3. The valve body according to claim 1, wherein the valve body is in a supply posture at a position deviating from a fluid supply path linearly connecting the primary side opening and the secondary side opening, and the shaft body is in a position deviating from the fluid supply path. The shut-off valve according to any one of the above.   The shut-off valve according to any one of claims 1 to 3, wherein the valve body includes an attachment portion to the shaft body, and the attachment portion is attached to the outer peripheral surface of the shaft body with backlash.   The mounting portion of the valve body is mounted with a backlash of 0.2 to 0.5 mm on one side between the mounting portion of the valve body and the outer peripheral surface of the shaft body. Shut-off valve.

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