JP4757555B2 - Open / close valve - Google Patents

Description

  The present invention relates to an open / close valve provided in a pipeline through which water flows, and in particular, an open / close valve which is provided in a pipeline of a water supply system for ejecting water for snow extinguishing, plant cultivation and fire extinguishing. About.

  Conventionally, as this kind of on-off valve, for example, those shown in FIGS. 6 and 7 are known (for example, described in JP-A-2003-21261).

The opening / closing valve Va is provided, for example, in a pipe line 18 provided with a sprinkler 17 of a snow removal system.
Specifically, the open / close valve Va has an inlet 21 and an outlet 22 and forms a flow path through which water flows, and the flow path of the tubular body 20 is divided into an inlet side chamber 21a and an outlet side chamber 22a and water passes through. A valve 30 that has a possible opening 31 and a valve that opens and closes the opening 31 at one end 40 a slidably through the sliding hole 24 provided in the tube wall 23 of the tube body 20 and through the sliding hole 24. A piston 40 having a portion 41, a storage portion 50 having a storage space 51 provided outside the tubular body 20 and storing the other end 40 b of the piston 40, and a storage space 51 between the inlet side chamber 21 a and the storage portion 50. Between the communication passage 60 through which the liquid can flow in and the housing 50 movably provided in the sliding direction of the piston 40 and the other end of the piston 40 fixed to the outside of the tube body 20. Contains liquid flowing in from 60 And a coil spring 71 as a biasing means 70 for biasing the movable plate M toward one end of the piston 40 and closing the valve portion 41 of the piston 40 by the biasing force. It has a configuration with.

The inlet 21 is connected to the pump P side that sucks and supplies water for watering. The outlet 22 is connected to the sprinkler 17 side. The communication passage 60 is provided with a check valve 61 for preventing the water flowing into the storage chamber 52 from flowing back into the inlet side chamber 21a.
The moving plate M forms a back pressure chamber 53 that partitions the storage space 51 of the storage portion 50 on the other end side in the sliding direction of the piston 40.

When the opening / closing valve Va is opened to supply water to the sprinkler 17 side and water is ejected from the nozzles of the sprinkler 17, the pump P is operated.
At this time, in the open / close valve Va, the pressure of the water flowing into the storage chamber 52 from the inlet 21 of the tube body 20 through the communication path 60 rises, and resists the biasing force of the coil spring 71 via the moving plate M. The piston 40 is moved, and the valve portion 41 opens the opening 31 by the movement of the piston 40. Then, water flows out from the outlet 22 through the inlet 21, the inlet side chamber 21a, the opening 31, and the outlet side chamber 22a.
On the other hand, when closing the opening / closing valve Va, the pump P is stopped. At this time, the water pressure in the storage chamber 52 drops, the moving plate M moves the piston 40 toward the one end 40 a by the biasing force of the coil spring 71, and the valve portion 41 of the piston 40 closes the opening 31.

JP 2003-21261 A

By the way, in the conventional opening / closing valve Va, when water is not sprinkled, the water inside the pipe body 20 of the opening / closing valve Va remains almost stagnant.
Specifically, the inside of the inlet side chamber 21a is somewhat wide, and heat transfer is performed by convection or the like and is difficult to freeze. However, the storage chamber 52 is narrow, and the water inside is one in the storage chamber 52 and the inlet side chamber 21a. Since the flow of water is blocked by the check valve 61 from the storage chamber 52 to the inlet side chamber 21a only by communicating with each other through the communication passage 60, convection is less likely to occur. The heat transfer efficiency to the water is very poor, and it becomes easy to freeze.
Therefore, if it freezes, piston 40 will not move, and even if it tries to sprinkle from a sprinkler, piston 40 cannot move, and since opening 31 cannot be opened, it will become impossible to sprinkle well.

  The present invention has been made in view of the above problems, and improves the heat transfer efficiency between the liquid in the inlet side chamber and the liquid in the storage chamber when the valve portion of the piston closes the opening. An object of the present invention is to provide an on-off valve that prevents the liquid in the storage chamber from phase transitioning from the liquid phase to the solid phase, enables the piston to move reliably, and allows the valve portion to open the opening. To do.

  In order to achieve such an object, the opening / closing valve of the present invention includes a tubular body that has an inlet and an outlet and forms a flow path through which liquid flows, and the flow path of the tubular body is divided into an inlet-side chamber and an outlet-side chamber, and liquid A partition having an opening through which the tube can pass, and a valve portion slidably provided in and through the sliding hole provided in the tube wall of the tubular body and opening and closing the opening at one end. A communication portion through which the liquid can flow by connecting the piston, a storage portion provided outside the tube body and having a storage space for storing the other end of the piston, and the inlet side chamber and the storage space of the storage portion. A storage chamber that is provided in the storage portion so as to be movable in the sliding direction of the piston and in which the other end of the piston is fixed and the liquid flowing in from the communication path is stored between the outside of the tubular body And a moving plate formed on the one end side of the piston. Urging means for urging and closing the valve portion of the piston by the urging force, and the urging force of the urging means by the pressure of the liquid flowing into the storage chamber from the inlet of the tube through the communication path An opening / closing valve that moves the piston against the moving plate and allows the valve to open the opening by moving the piston so that liquid can flow from the inlet to the outlet through the opening. In addition, in addition to the communication path, there is provided a through passage that penetrates between the inlet side chamber and the storage chamber.

For example, the open / close valve is connected to the inlet side of a pipe line capable of increasing or decreasing the internal pressure.
And when flowing a liquid from the inlet of an on-off valve to the outlet side, the pressure of the liquid inside the pipe line connected to the inlet side is raised.
At this time, in the open / close valve, as the pressure of the liquid inside the pipe connected to the inlet increases, the liquid enters from the inlet connected to the pipe, and the pressure of the liquid in the inlet side chamber also increases. The pressure of the liquid in the storage chamber communicated with the side chamber via the communication path and the through passage also increases. When the liquid pressure in the storage chamber exceeds a predetermined pressure, the moving plate moves against the urging force of the urging means, and accordingly, the piston moves to the other axial end side of the piston. The valve part of the opening / closing valve is opened.
When the valve portion of the open / close valve is opened, the liquid that has entered the inlet side chamber through the inlet through the pipe line sequentially flows into the outlet side chamber through the opening, and then flows out from the outlet.

On the other hand, when blocking the flow of the liquid from the inlet to the outlet of the open / close valve, the pressure of the liquid in the pipe is lowered.
At this time, in the open / close valve, the liquid pressure in the inlet side chamber also decreases as the liquid pressure in the pipe line decreases, and the liquid in the storage chamber communicated with the inlet side chamber through the communication passage and the through passage. The pressure also decreases. When the pressure of the liquid in the storage chamber becomes lower than a predetermined pressure, the moving plate is urged by the urging force of the urging means and moves to the storage chamber side, and the piston is moved along the one end side in the axial direction of the piston. The valve portion of the opening / closing valve is closed, and the flow of liquid to the downstream side of the main pipe and the outlet side chamber of the opening / closing valve is blocked.

  In this case, when the opening and closing valve is cooled at a low temperature, even if the liquid inside the opening and closing valve attempts to freeze, the liquid in the storage chamber is divided into two passages, a communication passage and a through passage, between the storage chamber and the inlet side chamber. Since the storage chamber, the inlet side chamber, the communication path, and the through passage communicate with each other to form an annular flow path, heat transfer efficiency from the inlet side chamber to the liquid inside the storage chamber is improved, and icing is suppressed. That is, for example, the convection of the liquid inside the storage chamber returns to the storage chamber through the through passage, the inlet side chamber, and the communication passage, or returns to the storage chamber through the communication passage, the inlet side chamber, and the through passage. For example, since the heat of the liquid inside the conduit connected to the inlet side is also transmitted to the liquid inside the storage chamber, it is extremely difficult to cause a phase transition of the liquid in the storage chamber to the solid phase. Can do. Therefore, since the liquid in the storage chamber can be kept in a liquid phase, when the pressure of the liquid in the conduit is increased at the next valve opening, the pressure of the liquid in the storage chamber increases accordingly. The piston can be moved reliably. Thereby, the valve part can open the opening, and the liquid can be supplied to the downstream rather than the outlet side chamber.

Moreover, it is set as the structure which formed the said through-passage in the said piston as needed.
In this case, the structure is simplified and the manufacturing cost is reduced as compared with the case where the opening / closing valve is provided with a new pipe and the through passage is provided.

Further, if necessary, the piston, and the cup body bottom outer has an open port at one axial end of the piston facing the interior of the accommodating chamber, to the mobile plate is erected on the bottom of the cup body A fixed rod to be fixed, and the valve portion is constituted by an open mouth edge portion of the cup body that comes into contact with an opening edge portion of the opening, and the through passage is provided at a bottom portion of the cup body. And a through hole communicating from the inside of the cup body to the external storage chamber.
When the valve portion of the piston closes the opening, the cup body provided on the piston has a certain diameter, so that heat transfer with the inlet side chamber is performed well. In addition, the through path is formed by a through hole communicating with the inside of the cup body, and the length of the through path is not so long, so that the efficiency of heat transfer to the accommodation chamber can be improved.

Furthermore, if necessary, the moving plate is configured with a housing and a back pressure chamber separated from the housing chamber in the housing space of the housing, and is configured with a diaphragm, and the urging means includes the back pressure chamber. A coil spring that is provided in the room and biases the diaphragm toward one end of the piston is provided.
Since the piston is moved by receiving the rise and fall of the pressure of the liquid applied to the storage chamber by the diaphragm, the response of the movement of the piston can be improved.

  Further, if necessary, a cylinder is provided between the partition wall and the pipe wall and the piston is slidably inserted. The cylinder has one end locked to the opening of the partition wall and the other end A cylindrical cylinder body that is inserted into the sliding hole of the partition wall, and a cylindrical body that is inserted into the inside of the other end of the cylinder body and has an inner surface that is in sliding contact with the piston. A valve seat to which the valve portion of the piston closely contacts is provided inside one end side, a through hole through which the inlet side chamber and the outlet side chamber communicate with each other on the side surface of the cylinder body, and the sliding hole is formed. A ring-shaped ring-shaped body that is detachably provided around the storage chamber side and that presses the other end edge of the cylinder body and the end edge of the cylindrical body is provided.

  If the piston seat is repeatedly opened and closed, and the inner surface of the cylindrical body on which the piston slides and the piston slides, the ring body can be removed from the tube wall to remove the cylinder body and the cylindrical body. As a result, the maintenance cost can be reduced as compared with the case where the entire opening / closing valve is replaced.

  According to the open / close valve of the present invention, in addition to the communication path that connects the storage chamber and the inlet side chamber, a through passage that penetrates the storage chamber and the inlet side chamber is provided, and the two passages are provided between the inlet side chamber and the storage chamber. Even if the surroundings of the opening / closing valve are low temperature and the inside is going to freeze, the storage chamber, the inlet side chamber, the communication path and the through passage communicate with each other in a ring shape, and the storage chamber, the inlet side chamber The heat transfer efficiency from the inlet side chamber to the liquid inside the storage chamber is improved by the occurrence of convection circulating through the communication passage and the through passage. For this reason, the heat of the liquid inside the inlet chamber is transferred to the liquid inside the storage chamber, so that the phase transition of the liquid inside the storage chamber to the solid phase can be made extremely unlikely and the piston can be moved reliably. The valve portion can be opened.

Hereinafter, an on-off valve according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
As shown in FIGS. 1 to 4, for example, this open / close valve is provided on a viaduct through which vehicles such as trains and automobiles pass, and a nozzle of a sprinkler that ejects water for snow removal from snow accumulated on the viaduct, etc. It is provided in the snow extinguishing system S provided with the pipe line provided.

As shown in FIGS. 2 and 4, the snow extinguishing system S includes a storage tank 1 in which water for snow extinguishing is stored, and first and second main pipes 2 through which water stored in the storage tank 1 flows. 3, a feed pipe 4 connected in parallel to the center of the two main pipes 2, 3 for feeding the water in the water storage tank to the main pipes 2, 3, and a nozzle 13 of the sprinkler 12 branched from the main pipes 2, 3. A plurality of header pipes 5 are provided.
The feed pipe 4 includes a pump P1 for sucking up water in the storage tank 1 and a boiler B for heating water from the storage tank 1, and water is supplied to the two main pipes 2 and 3 on the downstream side of the boiler B, respectively. Is branched into a first branch pipe 4 a connected to the center of the first main pipe 2 and a second branch pipe 4 b connected to the center of the second main pipe 3.
Further, in this snow extinguishing system S, water from the nozzle 13 of the sprinkler 12 and snow melted by this water are received by the inclined surface formed in the viaduct and collected in the side groove 6 provided in the viaduct, and are collected by the recovery pipe 6a. It is collected and sent to the storage tank 1.

  The on-off valve 7 according to the embodiment of the present invention is interposed in the header pipe 5 of the snow removal system S, shuts off the inflow of water to the header pipe 5 when the pump P1 is not operated, and is activated when the pump P1 is operated. When the water pressure inside the main pipes 2 and 3 is increased, the water is passed to the header pipe 5 side.

Specifically, as shown in FIGS. 1, 2, and 4, the open / close valve V includes an inlet 21 and an outlet 22 that form a flow path through which liquid flows, and a flow path of the tubular body 20. A partition wall 30 having an opening 31 through which a liquid is allowed to pass while being divided into an inlet side chamber 21a and an outlet side chamber 22a, and a sliding hole 24 provided in the tube wall 23 of the tubular body 20 is slidable and penetrates the sliding hole 24. A piston 40 having a valve portion 41 that opens and closes the opening 31 at one end, and a storage portion 50 having a storage space 51 that is provided outside the tubular body 20 and that stores the other end 40b side of the piston 40; A communication passage 60 through which the inlet side chamber 21a and the storage space 51 of the storage section 50 communicate and through which liquid can flow, and a movement of the piston 40 in the sliding direction of the piston 40 are provided in the storage section 50, and the other end 40b of the piston 40 is provided. Between the outside of the tube 20 A moving plate M that forms a storage chamber 52 in which liquid flowing in from the passage 60 is stored, and the moving plate M is biased toward the one end 40a of the piston 40, and the valve portion 41 of the piston 40 is closed by the biasing force. And a biasing means 70.
The piston 40 is moved against the urging force of the urging means 70 by the pressure of the water flowing from the inlet 21 of the tubular body 20 through the communication passage 60 into the accommodating chamber 52, and the valve portion 41 is moved by the movement of the piston 40. Opens the opening 31 so that water can flow from the inlet 21 to the outlet 22 through the opening 31.

More specifically, the tube body 20 is formed of a metal such as cast iron, for example.
Further, flanges 21 b and 22 b are formed at the inlet 21 and the outlet 22 of the tube body 20 so as to be connectable to other tube bodies 20. The flanges 21b and 22b are provided with holes (not shown) so that they can be connected to other pipe bodies 20 using bolts and nuts.
The inlet 21 is connected to the main pipes 2 and 3 via a connection pipe 14 extending from the main pipes 2 and 3 and an on-off valve 15 that manually opens and closes the pipe.
The outlet 22 is connected to a pressure reducing valve R described later via a short pipe 16.

The piston 40 is made of, for example, a metal such as stainless steel, and is provided with a cup body 42 that is provided on one end side, has an opening on the axial one end 40 a side of the piston 40, and the bottom outer side faces the inside of the accommodation chamber 52. A fixed rod 43 that is erected on the bottom of the body 42 and fixed to the moving plate M is provided.
Further, the valve portion 41 of the piston 40 is formed at the opening edge of the cup body 42. Further, the valve portion 41 is provided with an O-ring, and can be brought into close contact with a later-described valve seat 34.
Further, the piston 40 is provided with a through passage 80 that penetrates between the inlet side chamber 21 a and the storage chamber 52. The through passage 80 is configured by a through hole 81 provided in the bottom portion 42 a of the cup body 42 and communicating from the inside of the cup body 42 to the external storage chamber 52.

  The storage portion 50 has a cup-shaped case 56 attached to the tube wall 23 of the tube body 20 and a diameter that is substantially the same as the diameter of the opening 31 of the case 56 provided outside the tube wall 23 of the tube body 20. It has a cylindrical pedestal 57 having it. The case 56 is made of a metal such as cast iron, for example. Further, the pedestal 57 is formed integrally with the tube wall 23 of the tube body 20. The connection between the case 56 and the pedestal 57 is made by inserting stud bolts 59 screwed into the plurality of female screws 25 provided in the pedestal 57 into the plurality of holes 58 provided in the flange 50 a formed in the opening of the case 56. Then, the nut 59a is screwed into the stud bolt 59.

The moving plate M is configured by a diaphragm 90 (M) that is stretched in a direction orthogonal to the sliding direction of the piston 40. The diaphragm 90 (M) is made of, for example, a resin such as nitrile rubber, and the outer peripheral end portion is provided between the flange of the case 56 and the pedestal 57. The diaphragm 90 (M) has a diaphragm rod 91 on the side of the storage chamber 52 inserted through the fixed rod 43 and a diaphragm receiver 92 on the side of the back pressure chamber 53 to be described later. Is held by
Diaphragm retainer 91 is formed in a disk shape with, for example, a metal such as stainless steel, and is provided with an insertion port 93 through which the fixed rod 43 of piston 40 can be inserted at the center, and the surface on the back side of the surface in contact with diaphragm 90 (M). Is in contact with the bottom 42 a of the cup body 42 of the piston 40. Moreover, the diaphragm receiver 92 is formed in a disk shape with a metal such as cast iron, for example, and an insertion port 94 through which the fixed rod 43 of the piston 40 can be inserted is provided at the center.
The diaphragm holder 91 and the diaphragm receiver 92 are pressed against the cup body 42 side by a double nut 48 screwed into a male screw 49 formed on the other end 40b side of the piston 40, and hold the diaphragm 90 (M).

Further, the diaphragm 90 (M) forms a back pressure chamber 53 provided in the storage space 51 of the storage portion 50 so as to be separated from the storage chamber 52.
The urging means 70 includes a coil spring 71 that is provided in the back pressure chamber 53 and urges the diaphragm 90 (M) away from the bottom surface of the case 56. The coil spring 71 is in contact with the diaphragm receiver 92 at one end in the expansion / contraction direction. The biasing means 70 is provided with an adjusting mechanism 72 that adjusts the elastic force of the coil spring 71 so that the valve portion 41 of the piston 40 can open the opening when a desired water pressure is applied to the storage chamber 52. It has been. The adjustment mechanism 72 is screwed through the bottom of the case 56 and is moved in the approaching and separating directions with respect to the bottom of the case 56. It is the structure provided with the bolt 74 to be made. The tip of the bolt 74 is connected to a spring receiver 73 through a bearing 75 so as to be rotatable.
The adjusting mechanism 72 is screwed into the bolt 74 to bring the spring receiver 73 and the diaphragm receiver 92 close to each other and increase the urging force of the coil spring 71, while the spring receiver 73 and the diaphragm receiver 92 are separated by screwing back. The biasing force of the coil spring 71 is lowered.

Further, a cylinder 32 into which the piston 40 is slidably inserted is installed between the partition wall 30 and the pipe wall 23.
The cylinder 32 is inserted into the cylindrical cylinder body 32a having one end locked to the opening 31 of the partition wall 30 and the other end inserted into the sliding hole 24 of the partition wall, and the other end side of the cylinder body 32a. The side surface includes a cylindrical body 35 that is in sliding contact with the piston 40.
The cylinder body 32a is made of, for example, a metal such as stainless steel, and a valve seat 34 with which the valve portion of the piston is in close contact is provided inside one end side thereof.
In addition, a through hole 33 is provided on the side surface of the cylinder body 32a so that the inlet side chamber 21a and the outlet side chamber 22a communicate with each other and liquid can pass through.
The cylinder 35 is made of a metal such as stainless steel, for example.

Further, a ring-shaped ring-shaped body 37 that is detachably provided around the accommodation chamber 52 side of the sliding hole 24 and that presses the other end edge of the cylinder body 32 a and the edge of the cylindrical body 35 is provided.
The ring-shaped body 37 is provided with a plurality of holes 38 through which the bolts 27 screwed into the female screws 26 provided on the tube wall 23 can be inserted. The ring-shaped body 37 is provided with a cutout 39 so as not to block the communication path 60.

  Next, as shown in FIGS. 2 to 4, a pressure reducing valve R is interposed in the header pipe 5 on the downstream side of the opening / closing valve V. The pressure reducing valve R is used for supplying a constant water pressure to the header pipe 5 side.

  The pressure reducing valve R has an inlet 121 and an outlet 122 and forms a flow path through which liquid flows, and an opening 131 that partitions the flow path of the tubular body 120 into an inlet side chamber 121a and an outlet side chamber 122a and through which liquid can pass. And a valve part 141 that is slidable through the sliding hole 124 provided in the pipe wall 123 of the pipe body 120 and that passes through the sliding hole 124 and opens and closes the opening 131 at one end. The liquid is communicated between the piston 140, the storage portion 150 provided outside the tubular body 120 and having the storage space 151 in which the other end 140 b side of the piston 140 is stored, and the outlet side chamber 122 a and the storage space 151 of the storage portion 150. An inflow communication path 160 is provided in the storage portion 150 so as to be movable in the sliding direction of the piston 140, and the other end 140 b of the piston 140 is fixed to fix the tube body 120. The movable plate Ma that forms the storage chamber 152 in which the liquid flowing in from the communication path 160 is accommodated between the movable plate Ma and the movable plate Ma is biased toward the one end 140a side of the piston 140, and the valve portion of the piston 140 is biased by the biasing force. The biasing means 170 for opening 141 is provided.

  When the water pressure in the outlet side chamber 122a of the tube body 120 increases, the pressure of the water flowing into the storage chamber 152 through the communication passage 160 also increases, and the pressure in the storage chamber 152 resists the biasing force of the biasing means 170. When the moving plate Ma is moved, the valve portion 141 of the piston 140 is closed, and the flow of water from the inlet 121 to the outlet 122 through the opening 131 can be blocked.

  The tubular body 120 is made of a metal such as cast iron, for example. In addition, flanges 121 b and 122 b are formed at the inlet 121 and the outlet 122 of the pipe body 120 so as to be connectable to other pipe bodies 120. The flanges 121b and 122b are provided with holes (not shown) so as to be connected to flanges of other pipes using bolts and nuts (not shown).

As shown in FIG. 2, the inlet 121 of the pipe body 120 is connected to the outlet 122 of the pipe body 120 of the opening / closing valve V via the short pipe 16, and the outlet 122 of the pipe body 120 is connected to the nozzle 13 of the sprinkler 12. It is connected to the side.
As shown in FIG. 3, the piston 140 is made of, for example, a metal such as stainless steel, a disk body 145 coaxial with the axis of the piston 140 is provided on the one end 140 a side, and a moving plate Ma on the other end 140 b side of the piston 140. And a fixed rod 143 fixed to the head. The fixed rod 43 is formed to have a smaller diameter than the one end 140a side of the piston 140, and a step portion 146 is formed between the fixed rod 43 and the one end 140a side.

Further, the piston 140 is slidable in the sliding hole 124 through a cylindrical sliding portion provided in a diaphragm retainer 191 described later.
Furthermore, the valve portion 141 of the piston 140 is formed on the other axial end side of the piston 140 of the disc body 145.
In addition, a guide rod 147 that is inserted into a cylindrical guide member 127 provided on the tube wall 123 of the tube body 120 on one end side in the axial direction of the piston 140 with respect to the disc body of the piston 140 and guides the sliding of the piston 140. Is provided.
The guide member 127 is formed on a bush 127 a that is screwed from the outside of the tube body 20.

  The storage unit 150 has a cup-shaped case 156 attached to the tube wall 123 of the tube body 120 and a diameter substantially the same as the diameter of the opening 131 of the case 156 provided outside the tube wall 123 of the tube body 120. It has a cylindrical base 157 provided. The case 156 is made of a metal such as cast iron, for example. Further, the base 157 is formed integrally with the tube wall 123 of the tube body 120. The connection between the case 156 and the base 157 is made by inserting the stud bolts 159 screwed into the plurality of female screws 125 provided in the base 157 into the plurality of holes 158 provided in the flange 150a provided in the opening of the case 156. Then, the nut 159a is screwed into the stud bolt 159.

The moving plate Ma is configured by a diaphragm 190 (Ma) that is stretched in a direction orthogonal to the sliding direction of the piston 140. Diaphragm 190 (Ma) is formed of, for example, a resin such as nitrile rubber, and its outer peripheral end is provided between flange 150a and pedestal 157 of case 156. The diaphragm 190 (M) has a diaphragm rod 191 on the side of the storage chamber 152 inserted through the stationary rod 143 and a diaphragm receiver 192 on the side of the back pressure chamber 153 described later. Is held by
Diaphragm retainer 191 is formed in a disk shape from, for example, a metal such as stainless steel, and has an insertion port 193 through which fixing rod 143 of piston 140 can be inserted at the center, opposite to the surface in contact with diaphragm 190 (Ma). On the side surface, a sliding contact portion 198 is provided that is in sliding contact with the sliding hole 124. The sliding contact portion 198 is formed in a cylindrical shape that is coaxial with the axis of the piston 140. Diaphragm retainer 191 is in contact with stepped portion 146 of piston 140 on the back side of the surface in contact with diaphragm 190 (Ma).

Moreover, the diaphragm receiver 192 is formed in a disk shape from a metal such as cast iron, for example, and an insertion port 94 through which the fixed rod 143 of the piston 140 can be inserted is provided at the center.
The diaphragm holder 191 and the diaphragm receiver 192 are pressed against the step portion 146 side by a double nut 148 screwed into a male screw 149 formed on the other end 140b side of the piston 140, and hold the diaphragm 190 (Ma).

Further, the diaphragm 190 (Ma) forms a back pressure chamber 153 provided in the storage space 151 of the storage portion 150 so as to be separated from the storage chamber 152.
The urging means 170 includes a coil spring 171 provided in the back pressure chamber 153 and urging the diaphragm 190 (Ma) in a direction away from the bottom of the case 156. The coil spring 171 is in contact with the diaphragm receiver 192 at one end in the expansion / contraction direction. The biasing means 170 has an adjustment mechanism 172 that adjusts the elastic force of the coil spring 171 so that the valve portion 141 of the piston 140 can close the opening 131 when a desired water pressure is applied to the storage chamber 152. Is provided. The adjustment mechanism 172 includes a spring receiver 173 that contacts the other end of the coil spring 171 in the expansion / contraction direction, and is screwed through the bottom of the case 156 to move the spring receiver 173 in the approaching and separating directions with respect to the bottom of the case 156. It is the structure provided with the bolt 174 to be made. The tip of the bolt 174 is connected to the spring receiver 173 via a bearing 175 so as to be rotatable.

  The adjusting mechanism 172 brings the spring receiver 173 and the diaphragm receiver 192 close to each other by screwing the bolt 174 to increase the urging force of the coil spring 171 and separates the spring receiver 173 and the diaphragm receiver 192 by screwing back. The biasing force of the coil spring 171 is lowered.

A cylinder 132 into which the piston 140 is slidably inserted is installed between the partition wall 130 and the pipe wall 123.
The cylinder 132 is inserted into the cylindrical cylinder body 132a having one end locked in the opening 131 of the partition wall 130 and the other end inserted into the sliding hole 124 of the partition wall, and the other end side of the cylinder body 132a. The side surface includes a cylindrical body 135 that is in sliding contact with the piston 140.
The cylinder main body 132a is formed of, for example, a metal such as stainless steel, and a valve seat 134 is provided inside the one end of the cylinder main body 132a so that the valve portion of the piston is in close contact therewith.
In addition, a through-hole 133 is provided on the side surface of the cylinder main body 132a so as to allow liquid to communicate from the outside to the inside of the cylinder main body 32a.
The cylinder 135 is made of a metal such as stainless steel, for example.

The cylinder body 132a and the cylinder body 135 are detachably provided around the accommodation chamber 152 side of the sliding hole 124, and a ring-shaped ring body 137 that holds the other end edge of the cylinder body 132a and the cylinder body 135 is provided. I have.
The ring-shaped body 137 is provided with a plurality of holes 138 through which bolts 127 to be screwed into female screws 126 provided on the tube wall 123 can be inserted. The ring-shaped body 137 is provided with a notch 139 so as not to block the communication path 160.

Further, each member other than the piston 140 and the guide member 127 of the pressure reducing valve R is shared with the components of the on-off valve V described above.
Further, a drainage valve (not shown) that can drain water inside the header pipe 5 of the snow-melting system S provided with the opening / closing valve V according to the embodiment of the present invention when water is not sprinkled. Is provided.

  1 and 3, 31a and 131a are provided along the outer periphery of the cylinder main bodies 32a and 132, and O-rings that seal the outer periphery of the cylinder main bodies 32a and 132 and the openings 31, 131, and 32b and 132b are cylinder main bodies. O-rings 36a and 136a are provided along the outer circumferences of the cylindrical portions 36 and 136. The O-rings 36a and 136a are provided along the outer circumferences of the cylinder bodies 32a and 132a and seal the pipe walls 23 and 123 of the pipe bodies 20 and 120. The O-ring 42a is provided along the outer periphery of the cup body 42 and seals the inner periphery of the tubular part 42 and seals the inner periphery of the cylinder bodies 32a, 132 and the outer periphery of the tubular parts 36, 136. An O-ring 198 a is provided along the outer periphery of the sliding contact portion 198 of the diaphragm holder 91 and seals the outer periphery of the sliding contact portion 198 and the sliding hole 24. 6,176 is a bolt cover capable provided to cover the bolt 74,174 regulatory mechanisms 72, 172 detachably attached to the bottom of the case 56, 156.

When the snow-melting system S provided with the opening / closing valve V according to the embodiment of the present invention is used to spray water and melt it when it snows or accumulates, it is as follows.
First, as shown in FIG. 4, the pump P <b> 1 is operated to suck the water in the storage tank 1 and send it to the main pipes 2, 3 to increase the water pressure inside the main pipes 2, 3. At this time, as shown in FIG. 5A, in the open / close valve V, the main pipes 2, 3 are connected to the main pipes 2, 3 from the inlet 21 connected to the main pipes 2, 3 as the water pressure inside the main pipes 2, 3 increases. Water enters, the pressure of water in the inlet side chamber 21a also rises, and the pressure of water in the storage chamber 52 that communicates with the inlet side chamber 21a through the communication passage 60 and the through passage 80 also rises. When the water pressure in the storage chamber 52 exceeds a predetermined pressure, the diaphragm 90 (M) moves toward the back pressure chamber 53 against the biasing force of the coil spring 71 and the diaphragm 90 (M) itself, and the piston Accordingly, 40 moves to the other axial end side of the piston 40, and the valve portion 41 of the on-off valve V is opened.

At this time, the increase in the pressure of the water in the storage chamber 52 is received by the diaphragm 90 (M) and the piston 40 is moved, so that the response of the movement of the piston 40 can be improved.
When the valve portion 41 of the opening / closing valve V is opened, the water that has entered the inlet side chamber 21a from the main pipes 2 and 3 through the inlet 21 sequentially flows into the outlet side chamber 22a through the opening 31 and is depressurized from the outlet 22. It reaches the inlet 121 of the valve R and flows into the inlet side chamber 121a of the pressure reducing valve R.

In the pressure reducing valve R, the piston 140 is normally moved to the axial one end 140a side of the piston 140 by the coil spring 171 that urges the diaphragm 190 (Ma), and the valve portion 141 is in an open state. The inflowing water flows out from the outlet 122 through the inlet side chamber 121a, the opening 131, the outlet side chamber 122a, and the outlet 122.
The water flowing into the header pipe 5 is ejected from the nozzle 13 of the sprinkler 12 as the water pressure in the header pipe 5 increases. And snow is extinguished with this water.
The water after snow extinguishing and the water in which the snow is melted are put into the storage tank 1 through the side grooves 6 and the recovery pipe 6a.

At this time, when the pressure of the water flowing into the header pipe 5 increases, the pressure of the water in the outlet side chamber 122a of the pressure reducing valve R also increases. At this time, the pressure of the water in the storage chamber 152 also rises through the communication path 160 communicating with the outlet side chamber 122a. When the water pressure in the storage chamber 152 exceeds a predetermined pressure, the diaphragm 190 (Ma) moves toward the back pressure chamber 153 against the biasing force of the coil spring 171 that biases the diaphragm 190 (Ma). As a result, the piston 140 moves to the other axial end 140 b side of the piston 140, the valve portion 141 comes into close contact with the valve seat 134, and the valve portion 141 closes the opening 131.
For this reason, excessive water pressure is not applied to the sprinkler 12 side of the header pipe 5, and the nozzles 13 of the sprinkler 12 are less prone to malfunction.

On the other hand, when watering is finished after watering and melting snow, the pump P1 is first stopped.
At this time, as shown in FIG. 4, in each of the main pipes 2 and 3, the water in the storage tank 1 sent from the pump P <b> 1 is not sent, while the water inside the sprinkler of the header pipe 5 through the opening / closing valve V 12 is sent to the side 12 and ejected from the nozzle 13 of the sprinkler 12, the water pressure inside the main pipes 2 and 3 drops.
Further, as shown in FIG. 5B, in the open / close valve V, as the water pressure in the main pipes 2 and 3 decreases, the water pressure in the inlet side chamber 21a also decreases, and the inlet side chamber 21a communicates with the communication path. The pressure of the water in the storage chamber 52 communicated via 60 and the through passage 80 also decreases. When the water pressure in the storage chamber 52 becomes lower than a predetermined pressure, the diaphragm 90 (M) is biased by the biasing force of the coil spring 71 and the diaphragm 90 (M) itself, and moves to the storage chamber 52 side. Accordingly, the piston 40 moves to one end side in the axial direction of the piston 40, the valve portion 41 of the opening / closing valve V comes into close contact with the valve seat 34, the valve portion 41 closes the opening 31, and the main pipes 2, 3 and the opening / closing valve The flow of water downstream from the V outlet side chamber 22a is blocked.
At this time, the pressure of the water in the storage chamber 52 is lowered by the diaphragm 90 (M) and the piston 40 is moved, so that the response of movement of the piston 40 can be improved.

In this state, the water inside the header pipe 5 is drained using the drain valve of each header pipe 5.
At this time, water inside the pressure reducing valve R is also discharged from the drain valve via the header pipe 5. Therefore, when the water is not sprinkled, water is lost inside the pressure reducing valve R and the header pipe 5, and freezing of the water in the pressure reducing valve R and the header pipe 5 can be prevented.

  At this time, as shown in FIG. 5 (b), the water in the storage chamber 52 is communicated with the storage chamber 52 and the inlet side chamber 21a through the two passages 60 and 80. The heat transfer efficiency from 21a to the water inside the storage chamber 52 is improved. That is, for example, water inside the storage chamber 52 passes through the through passage 80, the inlet side chamber 21 a, and the communication passage 60 to the storage chamber 52, or passes through the communication passage 60, the inlet side chamber 21 a, and the through passage 80. Since such convection that returns to 52 occurs, the heat is also transferred to the water inside the storage chamber 52, so that the water in the storage chamber 52 can be hardly frozen. Therefore, the water in the storage chamber 52 can be kept in a liquid phase, and if the pressure of the water in the main pipes 2 and 3 is increased when the valve portion 41 opens the opening 31 next, the storage chamber The pressure of the water in 52 can also be raised accordingly, and the piston 40 can be reliably moved, so that the liquid can be supplied downstream from the outlet side chamber 22a, and water can be reliably sprayed. be able to.

At this time, since the through passage 80 is formed in the piston 40, the structure is simplified and the manufacturing cost is reduced as compared with the case where the opening and closing valve V is provided with the new pipe body 20 and the through passage 80 is provided. Is reduced.
Further, at this time, since the cup body 42 provided on the piston 40 has a certain diameter, heat transfer with the inlet side chamber 21a is performed well. Further, the through passage 80 includes a through hole 81 that communicates with the inside of the cup body 42 that is thermally transferred from the inlet side chamber 21a, and the length of the through passage 80 is not so long. It is possible to improve the heat transfer efficiency.

Thereafter, the piston 40, the cylinder body 32a, and the cylinder 35 may be worn and deteriorated by repeatedly opening and closing the piston 40. In this case, when replacing the piston 40, the case 56, the diaphragm 90 (M) and the piston 40 are removed, and the piston 40 is removed from the diaphragm 90 (M) and replaced with another one. Further, when the cylinder body 32a or the cylinder body 35 is exchanged, the bolts of the ring-shaped body 37 are loosened to remove the cylinder body 35, the cylinder body 32a is removed, and the cylinder body 32a and the cylinder body 35 are exchanged. Therefore, even if the valve seat 34 with which the valve portion 41 is in close contact and the sliding hole 24 with which the piston 40 slides deteriorate, the cylinder main body 32a and the cylindrical body 35 can be removed, so that they should be replaced with different ones. Therefore, the maintenance cost can be reduced as compared with the case where the entire opening / closing valve V is replaced.
In addition, since the opening / closing valve V shares most parts with the pressure reducing valve R, the manufacturing cost can be reduced compared to the case where both the opening / closing valve V and the pressure reducing valve R are manufactured using only dedicated parts.

In addition, although the opening / closing valve V according to the embodiment of the present invention is provided in the snow extinguishing system S, the present invention is not limited to this. For example, an agricultural water supply system that supplies water to the fields, industrial water, etc. As long as it is a liquid supply system pipeline that alternately repeats the supply and non-supply of liquid, such as an industrial liquid supply system that supplies the liquid, it may be provided in any system pipeline.
In addition, although the on-off valve V according to the embodiment of the present invention is provided in a pipe line through which water flows, the present invention is not limited to this and can be applied to any liquid such as oil or alcohol. May be.

It is sectional drawing which shows the on-off valve which concerns on embodiment of this invention. It is a figure shown in the state where the opening-and-closing valve concerning an embodiment of the invention was attached to the snow extinguishing system. It is a figure which shows the pressure-reduction valve proposed in the development stage of this invention. It is a figure showing an example of a snow extinguishing system provided with an opening-and-closing valve concerning an embodiment of the invention. It is a figure which shows the on-off valve which concerns on embodiment of this invention in the state which (a) opened and (b) closed, respectively. It is a figure which shows an example of the conventional on-off valve. It is a figure which shows an example of the snow removal system provided with the conventional opening-and-closing valve.

Explanation of symbols

S Snow removal system V Opening and closing valve M Moving plate 20 Tube 21 Inlet 21a Inlet side chamber 22 Outlet 22a Outlet side chamber 23 Tube wall 24 Sliding hole 25 Female thread 30 Bulkhead 31 Opening 32 Cylinder 32a Cylinder body 33 Through hole 34 Valve seat 35 Tube Body 37 Ring-shaped body 38 Hole 39 Notch 40 Piston 40a One end 40b Other end 41 Valve portion 42 Cup body 43 Fixed rod 50 Storage portion 51 Storage space 52 Storage chamber 53 Back pressure chamber 56 Case 57 Base 60 Communication passage 61 Check valve 70 Biasing means 71 Coil spring 72 Adjustment mechanism 73 Spring receiver 74 Bolt 75 Bearing 80 Through passage 81 Through hole 90 Diaphragm 91 Diaphragm presser

Claims (5)

A tubular body having an inlet and an outlet and forming a flow path through which the liquid flows; a partition wall that partitions the flow path of the tubular body into an inlet side chamber and an outlet side chamber; A piston that is slidable through a sliding hole provided in the wall and has a valve portion that opens and closes the opening at one end; and a piston provided outside the tubular body, in addition to the piston. A storage portion having a storage space for storing the end side, a communication passage through which the inlet side chamber and the storage space of the storage portion are communicated, and a liquid can flow in, and can move in the sliding direction of the piston in the storage portion A moving plate that forms a storage chamber in which the other end of the piston is fixed and the liquid flowing in from the communication path is stored between the piston and the outside of the tube, and the moving plate is connected to one end of the piston. Energizing to close the valve part of the piston by the energizing force And a stage,
The piston is moved through the moving plate against the urging force of the urging means by the pressure of the liquid flowing from the inlet of the tube through the communication passage into the housing chamber, and the movement of the piston moves the piston. In the on-off valve in which the valve portion opens the opening so that liquid can flow from the inlet to the outlet through the opening.
In addition to the communication passage, an opening / closing valve provided with a through passage penetrating between the inlet side chamber and the storage chamber.   2. The on-off valve according to claim 1, wherein the through passage is formed in the piston. A cup body having an opening on one end side in the axial direction of the piston and having an outer bottom facing the inside of the housing chamber; a fixed rod that is erected on the bottom of the cup body and fixed to the moving plate ; Configured with
The valve portion is constituted by an open mouth edge portion of the cup body that comes into contact with an opening edge portion of the opening,
3. The on-off valve according to claim 2, wherein the through passage is formed by a through hole provided at a bottom portion of the cup body and communicating from the inside of the cup body to the external storage chamber. The moving plate comprises a diaphragm and a back pressure chamber separated from the housing chamber and the housing chamber in the housing space of the housing portion,
4. The on-off valve according to claim 1, wherein the biasing means comprises a coil spring provided in the back pressure chamber and biasing the diaphragm toward one end of the piston. A cylinder is provided between the partition wall and the pipe wall and through which the piston is slidably inserted.
The cylinder has a cylindrical cylinder body with one end locked to the opening of the partition wall and the other end inserted through the sliding hole of the partition wall, and the inner surface is inserted into the other end side of the cylinder body. A cylindrical body that is in sliding contact with the piston,
A valve seat is provided inside the one end side of the cylinder body, to which the valve portion of the piston is in close contact, and a side hole of the cylinder body is provided with a through hole through which the liquid can pass through the inlet side chamber and the outlet side chamber.
2. A ring-shaped ring-shaped body that is detachably provided around the accommodation chamber side of the sliding hole and that holds the other end edge of the cylinder body and an end edge of the cylindrical body. The open / close valve according to 2, 3 or 4.

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