JP6603478B2 - 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 a valve box, a valve seat disposed in the middle of a flow path in the valve box, a valve body that opens and closes a water passage formed inside the valve seat, and a rotation of the valve body. A valve shaft serving as a moving center and a drive unit for driving the valve shaft are provided.

  In the shut-off valve of Patent Document 1, the valve body is disposed in the flow path, and is provided so as to open and close the water passage by driving of the drive unit. Specifically, the valve body is normally opened by leaving the water passage, and the drive unit is driven in the event of an earthquake, and the valve body rotates with the valve shaft to the valve seat. The water channel is closed by contact.

JP 2007-218433 A

  With this type of shut-off valve, it is necessary to suppress pressure loss as much as possible in order to facilitate water flow. However, in the shut-off valve of Patent Document 1, the valve element is arranged in the flow path in the open posture with the water passage opened. Therefore, the valve body obstructs water flow, and pressure loss is generated accordingly.

  Then, this invention aims at provision of the shut-off valve which can suppress the pressure loss by a valve body reliably.

The shut-off valve of the present invention has a valve box, a valve seat disposed in the middle of the flow path in the valve box, and a contact surface that can be attached to and detached from the valve seat by a rotating operation. The valve body that opens and closes the water passage formed inside the valve seat by the separation seat, the valve shaft that is the rotation center of the valve body, and the posture of the valve body by rotating the valve shaft, the contact surface Comprises a drive unit for switching between a closed position in which the water passage is closed and an open position in which the water passage is open, and the valve seat is a shut-off valve disposed downstream of the valve body, The valve box is provided with a recess that can be disposed at a position where the shaft is avoided from the flow path and at least a part of the valve body in the open posture is avoided from the flow path. A pair of bulging portions for externally fitting and supporting the upper and lower portions of the valve shaft are formed in the valve box, and fitted to the end side of the valve body between the pair of bulging portions Features There is fitted, the recess, towards the side with respect to the water supply path is formed so as to be recessed in a direction perpendicular to the water supply passage center, in the recess, said pair of bulging portions are arranged It is said.

  In the shut-off valve configured as described above, the valve shaft is rotated by the drive of the drive unit, and with the rotation of the valve shaft, the valve body in the open posture rotates toward the downstream side which is the valve seat side. The abutment surface is seated on the valve seat, the valve body is closed, the water passage is closed, and the water passage is blocked.

  In the shut-off valve configured as described above, since the valve shaft is in the recessed portion and is located away from the flow path, the pressure loss at the valve shaft during water flow from the upstream side to the downstream side can be suppressed, and the valve body When in the open posture, at least a part of it is accommodated in the recess so as to avoid from the flow path, so that the portion that becomes an obstacle in water flow from the upstream side to the downstream side is reduced accordingly. Pressure loss is suppressed.

In the shut-off valve of the present invention , the valve body may further include a valve body and a packing, and when the valve body is in an open posture, only the packing may be exposed to the flow path in a state parallel to the flow path.

In the shutoff valve of the present invention, the valve box has a primary side opening formed at the primary side end of the flow path, a secondary side opening formed at the secondary side end of the flow path, and the primary side end and the secondary side opening. Between the secondary side end, it is provided with a housing part whose diameter is expanded with respect to the primary side part and the secondary side part, and a valve seat is fitted on the inner peripheral surface near the housing part of the secondary side opening, A water passage is formed at the center of the seat, and the center of the water passage may coincide with the center of the flow path in a side view and may be displaced from the center of the flow path in a plan view.

  According to the shutoff valve of the present invention, the valve shaft is in a position avoided from the flow path, and when the valve body is in the open posture, at least a part of the valve body is in a position avoided from the flow path. The part which becomes obstructive in the water flow from the upstream side to the downstream side is reduced, and the pressure loss is suppressed accordingly.

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. In the tap water supply channel center 4 in the meter box 3 (horizontal straight line shown by a one-dot chain line in FIGS. 1 to 4), the stop cock 5 is disposed closer to the primary side (upstream side), and the shut-off valve 1 Is arranged 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, both the longitudinal direction L of the meter box 3 which is the direction of the water supply channel center 4 and the short direction S of the meter box 3 which is the horizontal direction perpendicular to the water supply channel center 4 It has been expanded.

  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. In addition, the inflow pipe 7, the stop cock 5, the water meter 6, and the water supply channel 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 shutoff valve 1 and an outflow pipe 9 are connected to form a flow path (hereinafter referred to as “water supply path”) 14. Has been.

  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 that is a drive unit. 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 stand (also referred to as a valve seat) 73 accommodated in the valve box 11, and a valve box 11. The valve body 13 accommodated and the valve shaft 19 which is a shaft body extended from the inside of the valve box 11 to the outside and connected to the valve body 13 are provided. 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. In this embodiment, the shutoff valve 1 is described as being installed in the water supply pipe in the meter box 3.

  The valve box 11 accommodates the valve body 13. 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 diameter of the water supply path 14 in the shutoff valve 1 of the present embodiment is slightly reduced by the valve stand 73 in the middle of the water flow direction compared to the diameter of the primary side opening 74 and the diameter of the secondary side opening 75. In other words, the diameter of the water passage 77 formed inside the valve bed 73 is slightly smaller than the diameter of the primary side opening 74 and the diameter of the secondary side opening 75.

  The water supply channel 14 is set on the water supply channel center 4. In the valve box 11, an accommodating portion 76 corresponding to a concave portion that is expanded in diameter with respect to the primary side portion and the secondary side portion is provided in the middle portion of the water supply channel 14 (between the primary side end and the secondary side end). It is integrally formed.

  The accommodating portion 76 is formed so as to be recessed in a direction orthogonal to the water supply channel center 4 toward the side with respect to the water supply channel 14. Moreover, the accommodating part 76 is formed so that it may become depressed toward upper direction so that the bottom wall 25 of the 1st case 22 mentioned later can be mounted. A part of the valve body 13 and the valve shaft 19 is accommodated in the accommodating portion 76 and is disposed on the primary side with respect to the valve seat 73 (water passage 77).

  The valve shaft 19 is an axis along the vertical direction. Near the secondary side of the accommodating portion 76, the valve box 11 has a pair of cylindrical bulging portions 79 and 80 that are spaced apart in the vertical direction so that the valve shaft 19 is externally fitted and supported at its upper and lower portions. Is formed. As shown in FIGS. 5 and 6 (plan sectional views), the bulging portions 79 and 80 are displaced to one side so as to be separated from the water supply channel 14 in a direction orthogonal to the water supply channel center 4 in plan view. Has been placed. That is, the bulging portions 79 and 80 are in the positions accommodated in the accommodating portion 76. For this reason, the valve shaft 19 supported by the bulging portions 79 and 80 is also displaced from the water supply channel center 4 and disposed in the accommodating portion 76. The valve shaft 19 is inserted through the upper bulging portion 79 via a seal member m10.

  The valve stand 73 is formed in an annular shape. The valve stand 73 is disposed in parallel with the water flow direction of the water supply passage 14. Specifically, the primary side end surface 78 and the secondary side end surface 85 in the valve stand 73 are formed in parallel to each other so as to be orthogonal to the water flow direction of the water supply passage 14. The primary side end surface 78 and the secondary side end surface 85 are annular surfaces. The valve base 73 is fitted on the inner peripheral surface of the secondary side opening 75 near the accommodating portion 76 via a seal member m9. A water passage 77 located on the water supply passage 14 is formed at the center of the valve stand 73. The water passage 77 is arranged inside the valve box 11 so as to pass through the water supply channel center 4. In the case of the present embodiment, the center of the water passage 77 coincides with the water supply channel center 4 in a side view, and the center of the water passage 77 is displaced with respect to the water supply channel center 4 in a plan view. A primary side end surface 78 that is an annular surface on the accommodating portion 76 side of the valve base 73 is a valve seat surface on which the valve body 13 is seated.

  As shown in FIGS. 7A, 7 </ b> B, 7 </ b> C, and 7 </ b> D, the valve body 13 includes a fitting portion 81, a valve main body 82, and a packing 84. The valve body 13 can be switched between a supply posture (hereinafter referred to as “open posture”) W1 and a supply cutoff posture (hereinafter referred to as “closed posture”) W2. The rotation angle between the open posture W1 and the closed posture W2 is approximately 90 °. The open posture W1 is a posture in which the water passage 77 of the valve base 73 is opened by the valve body 82 rotating around the valve shaft 19 together with the fitting portion 81. The closed posture W <b> 2 is a posture in which the valve body 82 rotates around the valve shaft 19 together with the fitting portion 81 to close the water passage 77 of the valve base 73, and the packing 84 attached to the valve body 82. The abutting portion 84 a is in a posture of abutting on the primary side end surface 78.

  The fitting portion 81 is a portion attached to the valve shaft 19 on the end portion side of the valve body 13. The fitting portion 81 is formed on the end side of the valve body 13. Accordingly, the valve shaft 19 is arranged at the end of the valve body 13. The fitting portion 81 is held in a position so as to be fitted on the middle portion of the valve shaft 19 in the vertical direction. The fitting portion 81 has a shape obtained by deforming a quadrangular shape in plan view, and arcuate chamfered portions are provided at three corners. Of the three chamfered portions, one chamfered portion 81b is formed with a smaller curvature (large arc) than the other two chamfered portions.

  The fitting portion 81 is between the bulging portions 79 and 80 and is fitted to the outer peripheral surface of the valve shaft 19 through a slight gap. A mounting hole 81a (see FIG. 7A) is formed on the side surface of the fitting portion 81, and a shaft-shaped fixing member 86 is inserted into the mounting hole 81a. The valve shaft 19 is inserted from the side of the shaft 19. There is a slight gap between the outer peripheral surface of the fixing member 86 and the peripheral surface of the mounting hole 81a. 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.

  The valve body 13 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 portion 83 is disposed so as to be displaced in the radial direction with respect to the fitting portion 81. For example, in the open posture W1 shown in FIG. 5, the displacement in the radial direction with respect to the fitting portion 81 is a direction arranged on the water supply channel 14 side with respect to the fitting portion 81. Further, the positional displacement in the radial direction with respect to the fitting portion 81 is, for example, a direction arranged on the downstream side with respect to the fitting portion 81 in the closed posture W2 shown in FIG.

  Further, the valve portion 83 is extended in a direction away from the valve shaft 19 from one of the three chamfered portions of the fitting portion 81. The direction away from the valve shaft 19 is, for example, the direction extended upstream in the open posture W1 shown in FIG. 5 and the direction along the water flow direction of the water supply passage 14. Further, the direction away from the valve shaft 19 is a direction extended so as to be orthogonal to the water flow direction of the water supply passage 14 in the closed posture W2 shown in FIG.

  The valve main body 82 further includes a packing 84 fixed to one side surface of the valve portion 83. The one side surface is a surface on the valve stand 73 side, for example, in the open posture W1 shown in FIG. Further, for example, in the closed posture W2 illustrated in FIG. 6, the surface is disposed on the downstream side. The packing 84 is formed in a substantially disk shape, and an annular contact portion 84a (corresponding to a contact surface) capable of contacting the primary end surface 78 of the valve seat 73 is bulged and integrated on the outer peripheral portion. Is prepared.

  From the configuration of the valve body 13 described above, in the shut-off valve 1 in the present embodiment, the valve shaft 19 is disposed avoiding the water supply passage 14, and substantially the entire valve shaft 19 is accommodated in the accommodating portion 76. By accommodating at least a part of the valve body 13 in the open posture W <b> 1 in the accommodating part 76, the valve shaft 19 and at least a part of the valve body 13 are avoided from the water supply path 14. In the present embodiment, in the open posture W <b> 1, only the packing 84 of the valve body 13 is exposed to the water supply passage 14 so as to be parallel to the water supply passage 14.

  Further, the packing 84 (at least the contact portion 84a of the packing 84) is arranged so as to be displaced with respect to the valve shaft 19 in a predetermined radial direction with a predetermined displacement amount with respect to the outer peripheral surface of the valve shaft 19. Has been. Further, the end portion on the valve shaft 19 side of the packing 84 overlaps the valve shaft 19 in the radial direction orthogonal to the predetermined radial direction. Specifically, in the open posture W <b> 1 shown in FIG. 5, the packing 84 is displaced toward the water supply channel 14 side (valve base 73 side) with respect to the valve shaft 19, and the end of the packing 84 on the valve shaft 19 side is not passed. In the water direction and in the radial direction perpendicular to the predetermined radial direction). The amount of displacement and the amount of overlap are not particularly limited as long as the water passage 77 can be blocked by contacting the primary end surface 78 of the valve seat 73 with the packing 84 in the closed 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 about the central axis in the direction along the short direction S, which is a direction orthogonal to the water supply channel 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 44 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 may be omitted, and the valve body 13 may be opened and closed by rotating the handle shaft 45.

  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. Further, the second case 23 includes a magnetic sensor that reacts with the magnetic force of the permanent magnet M and an LED. When this magnetic sensor corresponds to the permanent magnet M in the vertical direction, it detects that the presser member 47 has rotated. In order to notify the open / closed state of the valve body 13 by this detection, a lighting or flashing 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 open posture W1 and the closed 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 is opened to open the water passage 77 of the valve base 73, which is the water supply passage 14 inside the valve box 11. Yes. That is, the valve body 13 is in the open posture W <b> 1 and is along the water supply channel center 4 at a position where the valve main body 82 is off the water supply channel center 4. In the open posture W1 of the valve body 13, water can be supplied to each door, the drive mechanism 20 in the open posture W1 of the valve body 13 is in the state shown in FIG. 9, and the helical gear 37 is a timepiece centered on 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 arranged so as to be displaced from the water supply channel center 4. Further, the valve body 13 in the open posture W <b> 1 is disposed so as to be displaced from the water supply channel center 4. As in this configuration, by removing the valve body 13 and the valve shaft 19 from the water supply channel center 4 (water supply channel), the water supply channel 14 can be kept to a minimum of things that interfere with water supply. It is done.

  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 open posture W1 A closed posture W2 in which the water passage 77 is closed is brought into contact with the primary side end surface 78 of the table 73. 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 end surface 78 of the valve base 73, and the water passage 77 is closed by the contact portion 84 a of the packing 84.

  In the closed posture W2, as shown in FIGS. 4 and 6, the primary side water supply path and the secondary side water supply path in the water supply path 14 are not communicated with each other via the valve body 82, and the water supply in the valve box 11 is performed. Is cut 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 is in the closed 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 open position W1 to the closed position W2. When the valve body 13 is switched to the closed posture W2, the valve body 13 only moves through the water supply passage 14, and 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. Moreover, the valve body 13 receives the load by a water flow in the middle of switching from the open position W1 to the closed position W2. This load is added in the direction in which the valve body 82 is set to the closed posture W2, so that the torque for rotating the valve body 13 can be further reduced.

  In this shut-off valve 1, when the valve body 13 is switched from the open position W1 to the closed position W2, the valve body 13 and the valve shaft 19 only rotate within the valve box 11, and the valve box 11 (water supply path 14). ) There is no member inserted in. That is, since the shutoff valve 1 is not configured to close the water passage 77 of the valve base 73 against the pressure difference between the atmospheric pressure and the water pressure inside the valve box 11, the valve body 13 is affected by the water pressure. There is no. 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 with respect to the valve shaft 19. Then, when the valve body 13 is in the closed posture W2, the water passage 77 is closed with a degree of freedom corresponding to rattling. For this reason, when the load by a water flow acts on the valve body 13 in the closed posture W2, the water passage 77 is reliably closed by the valve body 13, and the water supply can be reliably shut off.

  In the shut-off valve 1 in the present embodiment, the valve shaft 19 is disposed away from the water supply channel 14, the valve shaft 19 is accommodated in the accommodating portion 76, and at least in the valve body 13 in the open posture W <b> 1 in the accommodating portion 76. By accommodating a part, at least a part of the valve shaft 19 and the valve body 13 is avoided from the water supply passage 14. In other words, there is nothing that obstructs water flow by the amount that the valve shaft 19 and the valve body 13 are avoided from the water supply path 14 in the water flowable state in the open posture W1. For this reason, pressure loss is suppressed.

  Further, the packing 84 is provided so as to be displaced in the predetermined radial direction with respect to the valve shaft 19, and the end of the packing 84 on the valve shaft 19 side is orthogonal to the predetermined radial direction with respect to the valve shaft 19. Overlapping in the radial direction. By setting it as such a structure, the area of packing 84 (contacting part 84a of packing 84) is securable. If the area of the packing 84 can be secured large, the diameter of the valve bed 73 (water passage 77) can be increased by that much, and the diameter of the water passage 77 can be brought close to the diameter of the water supply passage 14. For this reason, the pressure loss can be suppressed without increasing the size of the valve body 13 and the shut-off valve 1.

  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 moved together with the second case 23 so that the drive bevel gear 51 of the electronic component group 21 is engaged with the driven bevel gear 33. What is necessary is just to mount | wear to the 1st case 22 (drive mechanism part 20).

  Furthermore, in this embodiment, it is also 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 upward. 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 case 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 said embodiment, the primary side end surface 78 of the valve stand 73 demonstrated in the case of arrange | positioning in the direction substantially orthogonal to the water supply channel center 4. As shown in FIG. However, as shown in FIGS. 16 (a) and 16 (b), the primary side end surface 78 of the valve stem 73 can be set to be inclined with respect to the water supply channel center 4. In other words, the valve base 73 can be arranged such that the primary side opening faces the valve shaft 19.

  Specifically, the primary side end surface 78 is an annular inclined plane in which the end portion far from the valve shaft 19 is inclined upstream. By inclining the primary side end surface 78, the water passage 77 is inclined with respect to the water supply channel center 4 connecting the primary side opening 74 and the secondary side opening 75.

  In the present embodiment, the configuration of the valve body 13 is the same as the configuration of the valve body 13 of the embodiment shown in FIG. In the present embodiment, a configuration in which substantially all of the valve shaft 19 and the valve body 13 are accommodated in the accommodating portion 76 is employed. The closed posture W <b> 2 of the valve body 13 is a posture in contact with the primary side end surface 78 of the inclined valve stand 73. According to this configuration, the amount of rotation of the valve body 13 can be reduced by the amount by which the primary side end face 78 is inclined. In addition, by reducing the amount of rotation of the valve body 13, the length of the valve box 11 in the longitudinal direction (distance between surfaces) can be shortened.

  In the shutoff valve 1 according to the present embodiment, the valve shaft 19 is disposed away from the water supply channel 14, the valve shaft 19 is accommodated in the accommodating portion 76, and the valve portion 13 in the open posture W <b> 1 is accommodated in the accommodating portion 76. By accommodating all, the valve shaft 19 and the valve body 13 are avoided from the water supply passage 14. In other words, there is nothing that obstructs water flow by the amount that the valve shaft 19 and the valve body 13 are avoided from the water supply path 14 in the water flowable state in the open posture W1. For this reason, pressure loss is suppressed.

  The packing 84 is provided so as to be displaced in the predetermined radial direction with respect to the valve shaft 19, and the end of the packing 84 on the valve shaft 19 side is in the radial direction perpendicular to the predetermined radial direction with respect to the valve shaft 19. Are overlapping. By adopting such a configuration, the pressure loss can be suppressed without increasing the size of the shut-off valve 1.

  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 19 is disposed in a horizontal direction in a direction perpendicular to the water supply channel center 4 at a position deviating upward from the water supply channel center 4, and the valve body 13 is rotated around the valve shaft 19. By doing so, it can be configured to switch between the open posture W1 and the closed posture W2. In such a configuration, the primary side end surface of the valve stand 73 may be arranged in a direction substantially orthogonal to the water supply channel center 4, and the primary side end surface is set to be inclined with respect to the water supply channel center 4. It is also possible to do. The primary side end face is configured to be inclined so that the lower side is positioned on the upstream side. And in closed position W2, since the weight of valve body itself acts on the primary side end surface 78, the water flow path 77 can be closed reliably.

  In the above embodiment, the water supply channel center 4 in the water supply flow direction (fluid supply direction) is shown when the primary side opening 74 and the secondary side opening 75 are connected in a horizontal 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 water supply channel center 4 also extends from the horizontal direction to the vertical direction, and the water flow channel 77 is opened upward. That is, the water passage 77 is configured along the horizontal direction.

  In addition, the water supply channel center 4 in the direction of the water supply flow 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 water passage 77 is configured to open in a direction perpendicular to the feed water flow direction. Accordingly, the water passage 77 can be opened in any direction between the horizontal direction and the vertical direction, and the open posture W1 and the closed posture W2 of the valve body 13 are determined according to the opening direction of the water passage 77. .

  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. However, the shut-off valve is not limited to the emergency shut-off valve, for example, a water stop valve (including a temporary one for replacement or maintenance, including a continuous purpose such as a water stop or a waste plug), Alternatively, the present invention can be applied to a stop cock, 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. However, the shut-off valve 1 can be installed at an appropriate place in 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 embodiments, the seismic detector 53 that detects an earthquake having a predetermined seismic intensity or higher is used to detect the earthquake, so that the valve body 13 is changed from the open posture W1 to the closed posture W2. As the earthquake detector 53, a seismic device, an acceleration sensor, or the like is used, and the valve body 13 is changed from the open posture W1 to the closed posture W2 by detecting a predetermined seismic intensity and acceleration. However, the present invention is not limited to the configuration in which the valve body 13 is changed from the open posture W1 to the closed posture W2 by detecting an earthquake.

  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. Thus, it is conceivable to configure the valve body 13 from the open posture W1 to the closed posture W2. Alternatively, when tap water exceeds a predetermined pressure due to an abnormality in 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 It can be considered that the open posture W1 is changed to the closed posture W2. Furthermore, when the tap water exceeds a predetermined temperature due to an abnormality in the equipment, it is conceivable that this is detected by a temperature sensor and the valve body 13 is changed from the open posture W1 to the closed posture W2. .

  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. However, the present invention is not limited to the shutoff valve 1 that shuts off the tap water supply, and 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.

  In the embodiment shown in FIG. 5, a configuration is adopted in which only the packing 84 of the valve body 13 is exposed to the water supply passage 14 in parallel with the water supply passage 14 in the open posture W1. It is also possible to employ a configuration in which a part of the upstream side of the body 13 is exposed to the water supply channel 14 so as to be inclined. In any case, if at least a part of the valve body 13 is removed from the water supply passage 14 in the open posture W1, it is possible to suppress the water pressure loss by that amount.

  DESCRIPTION OF SYMBOLS 1 ... Shut-off valve, 2 ... Water supply piping structure, 3 ... Meter box, 4 ... Water supply center, 7 ... Inflow pipe, 8 ... Upstream opening, 9 ... Outflow pipe, 10 ... Downstream opening, 11 ... Valve box, 13 DESCRIPTION OF SYMBOLS ... Valve body, 14 ... Water supply path, 19 ... Valve shaft, 20 ... Drive mechanism part, 21 ... Electronic component group, 53 ... Earthquake detector, 71 ... Valve mechanism part, 72 ... Valve body rotation means, 73 ... Valve stand 74 ... primary side opening, 75 ... secondary side opening, 76 ... accommodating part, 77 ... water passage, 78 ... primary side end surface, 81 ... fitting part, 82 ... valve body, 83 ... valve part, 84 ... packing, 84a ... Abutting portion, 86 ... Fixing member, W1 ... Open posture, W2 ... Closed posture

Claims (3)

A valve box, a valve seat disposed in the middle of the flow path in the valve box, and a contact surface that can be attached to and detached from the valve seat by a rotating operation. The valve body that opens and closes the water passage formed in the valve, the valve shaft that is the pivot center of the valve body, and the posture of the valve body by rotating the valve shaft, the contact surface that closes the water passage A drive unit for switching between a posture and an open posture in which the water passage is opened, and the valve seat is a shut-off valve disposed on the downstream side with respect to the valve body,
A valve shaft is disposed away from the flow path, and a recess that can be accommodated at a position where at least a part of the valve body in an open posture is avoided from the flow path is provided in the valve box,
The valve shaft is an axis extending in the vertical direction, and a pair of bulged portions for externally supporting the upper and lower portions of the valve shaft are formed in the valve box, and the end of the valve body between the pair of bulged portions The fitting part provided on the side is externally fitted ,
The said recessed part is formed so that it may become depressed in the direction orthogonal to the center of a water supply path toward the side with respect to a water supply path, The said bulging part is arrange | positioned in the said recessed part, The shut-off valve characterized by the above-mentioned .   The shut-off valve according to claim 1, wherein the valve body further includes a valve main body and a packing, and only the packing is exposed in the flow path in a state parallel to the flow path when the valve body is in the open posture.   The valve box has a primary side opening at the primary side end of the flow path, a secondary side opening at the secondary side end of the flow path, and a gap between the primary side end and the secondary side end. The primary side and the secondary side are provided with an enlarged storage portion, and a valve seat is fitted to the inner peripheral surface of the secondary side opening near the storage portion. The shut-off valve according to claim 1 or 2, wherein a water passage is formed, the center of the water passage coincides with the center of the flow path in a side view and is displaced from the center of the flow path in a plan view.

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