JP4787129B2 - Automatic valve device - Google Patents

Description

The present invention relates to an automatic valve device used in a water spray facility or a fire extinguishing facility installed in a tunnel or the like.

  Conventionally, water spray equipment has been installed as emergency equipment in tunnels such as expressways and automobile roads that exceed a certain length, and if a fire breaks out in the tunnel, it corresponds to the fire occurrence zone. By activating the installed automatic valve device, water is discharged from the water spray head to suppress fire and prevent the spread of fire.

  Such an automatic valve device includes an automatic valve main body 10, a start valve 12, and a pressure regulating valve 14, as shown in FIG. When the activation valve 12 is activated remotely or manually from the normal monitoring state, the pressurized water on the primary side of the automatic valve body hand 10 is supplied from the activation valve 12 to the pressure adjustment valve 14 and the pilot pressure adjusted by the pressure adjustment valve 14 is supplied. The pressurized water flows into the cylinder chamber 28 of the automatic valve body 10 and pushes up the piston 30 to open the valve 26.

  The pressure regulating valve 14 sets a prescribed pressure on the secondary side of the automatic valve body 10 by the load of a spring 36 provided on the upper portion of the diaphragm 34, and the pressurized water on the secondary side of the automatic valve body 10 is placed below the diaphragm 34. The pilot pressure supplied to the cylinder chamber 28 is adjusted by controlling the pilot valve 40 so that the secondary side pressure becomes the specified pressure.

  However, until the automatic valve body 10 is opened and the secondary side piping of the automatic valve body 10 is filled with water, the pressure regulating valve 14 cannot detect the secondary side pressure, and the pilot valve 40 is fully opened. The primary-side pressurized water flows into the cylinder chamber 28 without being regulated and pushes up the piston 30 to increase the valve opening of the automatic valve body 10.

  When the passage of time from the opening of the automatic valve body 10 and the filling of the secondary side piping is completed, the secondary side pressure rises. At this time, the opening degree of the pilot valve 40 is controlled so that the diaphragm 34 in the pressure regulating valve 14 is balanced with the spring 36, the pressurized water is drained from the cylinder chamber 28, the piston 30 is returned, and the valve opening degree is lowered. The valve opening degree of the automatic valve body 10 is controlled so that the secondary side pressure of the valve body 10 becomes a specified pressure.

FIG. 6 shows the time change of the secondary pressure at the time of starting the valve opening in the conventional automatic valve device of FIG. When the degree control is started, the opening degree of the valve is narrowed down to reduce the increased secondary pressure, and the control state shifts to the specified pressure control state while hunting.
JP 2000-120898 A

  However, in such a conventional automatic valve device, the pressure regulating valve 14 detects the secondary pressure from the start of the valve opening of the automatic valve body 10 due to the opening of the start valve 12, and the automatic valve body 10 is set to the specified pressure. In the meantime, there is a problem that overflow water discharge is performed in which pressurized water is supplied from the automatic valve main body 10 at a large pressure exceeding a specified pressure and discharged excessively.

  For example, when a vehicle fire occurs in a tunnel, if the water spray facility is activated and water discharge is started, and the overflow water discharge is performed, it is impossible to instantaneously secure the visibility of the discharged water area, and the passing vehicle has an accident. Or evacuees may not be able to evacuate quickly.

  In the case of a water discharge test, water for fire extinguishing is consumed more than necessary due to overflow water discharge, and when the water discharge test is repeated to adjust the pressure of the automatic valve, the water tank is emptied by overflow water discharge. There is a risk that the water discharge test will not be possible. In particular, in the water spray facility for tunnels, the amount of water flowing into the water storage tank is set to a very small amount due to the water rights, and it is designed to fill up over a long period of time such as one week. Fire water consumption needs to be reduced as much as possible.

An object of this invention is to provide the automatic valve apparatus which prevented the overflow water discharge at the time of valve opening starting.

In order to achieve this object, the present invention is configured as follows. The automatic valve device of the present invention is
An automatic valve body having a valve arranged to be openable and closable with respect to a valve seat separating the primary side and the secondary side in the valve body, and a drive mechanism having a piston slidably mounted on the cylinder for slidably driving the valve When,
A pressure adjusting valve that adjusts the pressure water supplied to the cylinder chamber of the automatic valve body so that the secondary side pressure becomes a specified pressure;
A starting valve for supplying pressure water on the primary side of the automatic valve body to the pressure regulating valve by opening operation and stopping supply of pressure water by closing operation;
Bypass flow path that reaches the secondary side of the automatic valve body until the secondary side pressure reaches the specified initial pressure when the automatic valve body is opened and the secondary side pressure reaches the specified initial pressure. An initial water discharge pressure control valve that suppresses the pressure increase in the cylinder chamber by opening and shuts off the bypass flow path above the specified initial pressure,
Is provided.

Here, the water discharge initial water discharge pressure control valve bypasses the pressure water supplied from the pressure adjustment valve to the cylinder chamber of the automatic valve body. The water discharge initial water discharge pressure control valve may bypass the primary pressure water supplied from the start valve to the pressure regulating valve.

  According to the present invention, a part of pressurized water for starting valve opening supplied to the cylinder chamber of the automatic valve body is bypassed by the initial water discharge pressure control valve and drained to the secondary side, and the valve opening degree of the automatic valve body is controlled. By suppressing the lift amount to be small, it is possible to reliably suppress overflow water discharge to the secondary side when the valve is opened.

  In addition, when the secondary pressure reaches the specified initial pressure in the bypass state of the pressurized water for startup by the initial water discharge pressure control valve that suppresses the overflow water discharge, the initial water discharge pressure control valve closes the bypass flow path and automatically pressurizes the pressurized water. Stops draining to the secondary side of the valve body, and all the startup pressurized water flows into the cylinder chamber of the automatic valve body, and the overflow prevention function is automatically released and the control can be shifted to the specified pressure control by the pressure regulating valve. .

Further, by adding an initial water discharge pressure control valve without modifying the conventional automatic valve body, it is possible to easily and easily prevent overflow water discharge to the secondary side at the time of opening the valve.

  FIG. 1 is an explanatory view showing an embodiment of an automatic valve device according to the present invention. In FIG. 1, the automatic valve device of the present invention includes an automatic valve main body 10, an activation valve 12, a pressure adjustment valve 14, and an initial water discharge pressure control valve 16.

  The automatic valve main body 10 has a valve body 18, one of the valve bodies 18 is provided with an inlet 20, where the primary side pressurized water is supplied, and the other side is provided with an outlet 22. A pipe (not shown) is connected to 22 and a water spray head or the like is attached to the end of the pipe.

  A partition wall 24 that partitions the primary side and the secondary side is provided in the valve body 18, and a valve 26 is arranged to be openable and closable with respect to a valve hole opened in the partition wall 24. The valve 26 has a stem 25 mounted at the center and a piston 30 fixed to the outside thereof. The piston 30 is slidably incorporated in the cylinder chamber 28.

  The pressure regulating valve 14 has a diaphragm 34 disposed above the valve body 32, and a spring 36 that applies a spring load for setting a secondary-side specified pressure by the automatic valve body 10 is disposed above the diaphragm 34. A secondary pressure introducing chamber 38 for introducing the secondary pressure of the automatic valve body 10 is formed below 34. A pilot valve 40 is incorporated below the diaphragm 34. The valve body 32 is provided with an input port Q1, an output port Q2, and a control port Q3.

  In a state where the secondary side pressure of the automatic valve body 10 is introduced to the control port P3, the pilot valve 40 has a diaphragm 34 determined by a balance between a set load by the spring 36 and a secondary side pressure applied to the secondary pressure introduction chamber 38. When the secondary pressure is lower than the specified pressure determined by the spring load of the spring 36, the diaphragm 34 moves in the direction of opening the pilot valve 40, and the pressurized water from the input port Q1 is passed through the opening portion of the pilot valve 40. And output to the control port Q3.

  On the other hand, if the secondary side pressure becomes higher than the prescribed pressure determined by the spring 36, the diaphragm 34 moves in the direction of closing the pilot valve 40, and the pressurized water from the control port Q3 is supplied from the secondary side of the pilot valve 40 to the control port Q3. I try to pull it out through the route.

  Thus, the piping connection of the automatic valve main body 10, the start valve 12 and the pressure regulating valve 14 constituting the automatic valve device of the present embodiment is as follows. First, a port C <b> 1 is provided on the primary side of the valve body 18 of the automatic valve body 10, and the pipe L <b> 1 is connected to the input port PQ <b> 1 of the pressure regulating valve 14 from the port C <b> 1 through the start valve 12.

  The control port Q3 of the pressure regulating valve 14 is connected to a port C2 communicating with the cylinder chamber 28 of the automatic valve body 10 via the pipe L2, the initial water discharge pressure control valve 16, and the pipe L3. The control port Q3 of the pressure adjusting valve 14 is connected to the secondary side port C3 of the automatic valve body 10.

  In the automatic valve device of the present embodiment, the initial water discharge pressure control valve 16 is disposed between the pipes L2 and L3 extending from the output port Q3 of the pressure regulating valve 14 to the port C2 communicating with the cylinder chamber 28 of the automatic valve body 10. Is connected. In the initial water discharge pressure control valve 16, a spool valve 42 is disposed inside the valve body 40, a spring 44 is disposed above the spool valve 42, and a regulated initial constant force P <b> 2 determined by the spring load is set.

  Here, if the specified pressure on the secondary side of the automatic valve body 10 determined by the spring load of the spring 36 of the pressure adjusting valve 14 is P1, the specified initial pressure P2 set in the initial water discharge pressure control valve 16 is the pressure adjusting valve. 14 is set to a value lower than the specified pressure P1.

  The spring load of the spring 44 provided on the upper part of the spool valve 42 can be adjusted by the adjustment bolt 45 to adjust the spring load, that is, the value of the specified initial pressure P2. The spool valve 42 is integrally formed with a valve portion 46 on the lower side, and the valve portion 46 is accommodated in a valve chamber having an input port S1 and an output port S2.

  Further, the valve body 18 is provided with a bypass port S3, and the bypass port S3 communicates with a valve chamber formed in the upper portion via a valve seat 48. The bypass port S3 of the initial water discharge pressure control valve 16 is connected to a port C4 communicating with the secondary side of the automatic valve body 10 via a bypass pipe L5.

  Next, the operation of this embodiment of FIG. 1 will be described. In the normal monitoring state, the start valve 12 is in a closed state, and primary pressurized water is supplied to the inlet 20 of the automatic valve body 10, but the valve 26 is in a closed state and the secondary side. Supply to is cut off.

  In this state, when the starting operation is performed to open the starting valve 12 remotely or manually, the primary pressurized water from the inlet 20 is supplied from the starting valve 12 to the input port Q1 of the pressure regulating valve 14 through the pipe L1. The

  When the starting valve 12 is opened, since there is no pressurized water on the secondary side of the automatic valve body 10, the pilot valve 40 of the pressure regulating valve 14 is pushed down by the spring 36 and is fully opened. The pressurized water at the port Q1 flows out from the output port Q2 through the pilot valve 40 without being regulated, and is supplied to the input port S1 of the initial water discharge pressure control valve 16.

  In the initial state, the spool valve 42 of the initial water discharge pressure control valve 16 is pushed by the spring 44 and the illustrated valve seat 48 is opened. For this reason, the pressurized water supplied to the input port S1 is supplied from the control port S2 through the pipe L3 to the cylinder chamber 28 of the automatic valve body 10 from the port C2.

  At the same time, since the valve seat 48 of the initial water discharge pressure control valve 16 is open, the pressurized water supplied to the input port S1 flows through the open portion of the valve seat 48 to the bypass port S3 and automatically passes through the bypass pipe L5. The gas is discharged from the port C4 of the valve body 10 to the outflow side.

  For this reason, part of the pressurized water supplied from the pressure regulating valve 14 to the cylinder chamber 28 of the automatic valve body 10 is bypassed and discharged to the secondary side, and the amount of pressurized water supplied to the cylinder chamber 28 is reduced. Thus, the push-up amount of the piston 30 is reduced, and the opening degree of the automatic valve body 10 by the valve 26 is suppressed.

  FIG. 2 shows the supply state of pressurized water when the valve is opened in the embodiment of FIG. In addition, about the automatic valve main body 10, the pressure regulation valve 14, and the initial water discharge pressure control valve 16 of FIG. 2, the cross-sectional hatching in FIG. 1 is abbreviate | omitted in order to make the supply state of pressurized water easy to understand.

  As is apparent from the supply state of the pressurized water in FIG. 2, when the start valve 12 is opened, the pressurized water that has been supplied to the inlet 20 of the automatic valve body 10 is supplied to the pressure adjustment valve 14 through the pipe L1. The valve 14 passes through the pilot valve 40, passes through the valve portion 46 of the initial water discharge pressure control valve 16 from the pipe L2, is supplied to the cylinder chamber 28 of the automatic valve body 10 by the pipe L3, and pushes up the piston 30 in the opening direction. ing.

  At the same time, in the initial water discharge pressure control valve 16, since the valve seat 48 is open, the pressurized water from the input port S1 flows out from the bypass port S3 and passes through the bypass pipe L5 to the secondary side of the automatic valve body 10. It has been discharged. At the same time, since the valve 26 starts to open by pushing up the piston 30, the pressurized water flows from the primary side to the secondary side where the outlet 22 is provided, and is supplied to the secondary side pipe.

  When a certain period of time elapses after the valve is opened, the secondary side pipe is filled with pressurized water, the secondary pressure in the automatic valve body 10 rises, and is initially set by the spring 44 of the initial water discharge pressure control valve 16. The specified initial pressure P2 is reached.

  When the secondary side pressure of the automatic valve body 10 reaches the specified initial pressure P2, the force that pushes the spool valve 42 of the initial water discharge pressure control valve 16 upwards overcomes the spring load of the spring 44 and strokes. Abuts against the valve seat 48 to block the bypass flow path from the input port S1 to the bypass port S3.

  For this reason, drainage of the automatic valve body 10 supplied from the pressure adjustment valve 14 to the secondary side by the bypass of the pressurized water regulated to the cylinder chamber 28 is stopped, and the pressure adjustment valve 14 is 2 of the automatic valve body 10. The control for maintaining the secondary pressure at the specified pressure P1 is performed.

  FIG. 3 is a time chart of the time variation of the secondary pressure at the time of valve opening start controlled by the present embodiment of FIG. In FIG. 3, a control characteristic A is a control characteristic according to the present embodiment, and a broken line characteristic B is a control characteristic of the conventional apparatus shown in FIG.

  In the control characteristic A of the present embodiment, when the start valve 12 is opened at time t0, until the secondary pressure reaches the specified initial pressure P2 set in the initial water discharge pressure control valve 16. A part of the pressure-regulated pressurized water supplied from the pressure regulating valve 14 to the cylinder chamber 28 of the automatic valve main body 10 is bypassed and discharged to the secondary side, whereby the push-up amount of the piston 30 is suppressed.

  For this reason, in the conventional control characteristic B in which the initial water discharge pressure control valve 16 is not provided, the overflow discharge to the secondary side exceeding the specified pressure P1 occurs immediately after the valve opening is started. In the characteristic A, an increase in the secondary pressure is suppressed by the bypass discharge of the pressure-regulated pressurized water from the pressure regulating valve 14 by the initial water discharge pressure control valve 16, and the pressure rises almost linearly toward the specified pressure P1. To do.

  When the secondary pressure increases due to the supply of pressurized water to the secondary side and reaches the specified initial pressure P2 set in the initial water discharge pressure control valve 16 at time t1, the spool valve 42 of the initial water discharge pressure control valve 16 is reached. By this operation, the bypass flow path for draining the pressure-regulated pressurized water to the secondary side is shut off, and after time t1, the pressure-regulated pressure water from the pressure regulating valve 14 is supplied to the cylinder chamber 28 of the automatic valve body 10 as it is. The pressure is controlled so as to become the pressure P1, and the state shifts to a stable control state of the specified pressure P1 from time t2.

  FIG. 4 shows another embodiment of the automatic valve device according to the present invention. In the embodiment shown in FIG. 1, the initial water discharge pressure control valve 16 is provided between the piping of the pressure regulating valve 14 and the cylinder chamber 28 of the automatic valve body 10. In this embodiment, the initial water discharge pressure control valve 16 is provided between the pressure regulating valve 14 and the start valve 12 in this embodiment.

  That is, in the embodiment of FIG. 4, the automatic valve device includes the automatic valve body 10, the start valve 12, the pressure adjustment valve 14, and the initial water discharge pressure control valve 16, as in the embodiment of FIG. 1. The initial water discharge pressure control valve 16 is connected to the input port S1 by the pipe L1 on the secondary side of the start valve 12, and the output port S2 is connected to the input port P1 of the pressure regulating valve 14 by the pipe L2. The bypass port S3 of the initial water discharge pressure control valve 16 is the same as the embodiment of FIG. 1 in that it is connected to the secondary side port C4 of the automatic valve body 10 by the bypass pipe L5.

  In the operation of the embodiment of FIG. 4, when the start valve 12 is opened remotely or manually, the pressurized water on the primary side of the automatic valve body 10 is supplied from the pipe L1 to the initial water discharge pressure control valve 16, and the input port S1 outputs the output port. Since the secondary pressure is not generated at this time through the pipe L2 through the pipe L2, the pilot valve 40 is in an open state, and the pilot valve 40 passes through the pipe L3 as it is. The pressurized water is supplied to the cylinder chamber 28.

  At the same time, the spool valve 42 of the initial water discharge pressure control valve 16 has the valve portion 46 opened from the valve seat 48 by the force of the spring 44. Therefore, the pressurized water supplied to the input port Q1 flows to the bypass port S3 and is bypassed by the bypass pipe L5. It is discharged to the secondary side of the automatic valve body 10.

  As a result, the supply flow rate is reduced by the amount that the primary pressurized water supplied to the input port P1 of the pressure regulating valve 14 is bypassed by the initial water discharge pressure control valve 16 and discharged to the secondary side of the automatic valve body 10. Accordingly, the amount of pressure-regulated pressurized water supplied to the cylinder chamber 28 of the automatic valve body 10 via the pressure regulating valve 14 is reduced, and the amount of pushing up of the piston 30 is suppressed. As a result, the control characteristic A of FIG. Such control of the secondary pressure with respect to the passage of time can be realized, and overflow water discharge to the secondary side as in the conventional control characteristic B immediately after the opening of the valve opening can be reliably prevented.

  In addition, the structure and operation | movement of the automatic valve main body 10, the pressure regulation valve 14, and the initial water discharge pressure control valve 16 in embodiment of FIG. 4 are the same as embodiment of FIG. 1, and the connection position of the initial water discharge pressure control valve 16 is different. Just do it.

Further, the present invention includes appropriate modifications that do not impair the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

Explanatory drawing which showed embodiment of the automatic valve apparatus by this invention Explanatory drawing of operation at the time of valve opening start of FIG. The time chart of the time change of the secondary side pressure controlled by the embodiment of FIG. Explanatory drawing which showed other embodiment of the automatic valve apparatus by this invention. Illustration of a conventional automatic valve device Time chart of the time change of the secondary side pressure in the conventional automatic valve device

Explanation of symbols

10: Automatic valve body 12: Start valve 14: Pressure adjustment valve 15: Initial water discharge pressure control valve 16: Pressure adjustment valve 18, 32, 40: Valve body 20: Inlet 22: Outlet 24: Partition wall 26: Valve 28 : Cylinder chamber 30: Piston 34: Diaphragm 36, 44: Spring 38: Secondary pressure introduction chamber 42: Spool valve 46: Valve portion 48: Valve seat

Claims (3)

An automatic equipped with a valve that can be freely opened and closed with respect to a valve seat that partitions the primary side and the secondary side in the valve body, and a drive mechanism that is slidably provided in a cylinder chamber for opening and closing the valve. A valve body;
A pressure adjusting valve that adjusts the pressure water supplied to the cylinder chamber of the automatic valve body to adjust the secondary pressure of the automatic valve body to a specified pressure;
A starting valve for supplying pressure water on the primary side of the automatic valve body to the pressure regulating valve by opening operation and stopping supply of the pressure water by closing operation;
A prescribed initial pressure lower than a prescribed secondary pressure by the pressure regulating valve is set, and until the secondary pressure reaches the prescribed initial pressure when the automatic valve body is opened, the secondary pressure of the automatic valve body An initial water discharge pressure control valve that opens the bypass flow path to suppress the pressure increase in the cylinder chamber and shuts off the bypass flow path above the specified initial pressure;
An automatic valve device characterized by comprising:
2. The automatic valve device according to claim 1, wherein the initial water discharge pressure control valve bypasses pressure water supplied from the pressure adjusting valve to a cylinder chamber of the automatic valve body.
  2. The automatic valve device according to claim 1, wherein the initial water discharge pressure control valve bypasses primary pressure water supplied from the start valve to the pressure regulating valve.

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