JP5350926B2 - Flowing water detector - Google Patents

Description

The present invention relates to a water flow detection device in fire extinguishing equipment such as sprinkler equipment.

  Conventionally, in sprinkler equipment, foam fire extinguishing equipment, and water spray equipment, a water flow detection device is provided in the middle of a pipe that supplies pressurized water from a pressurized water supply device to a head.

  In a sprinkler facility installed in a high-rise building, the water discharge pressure of the sprinkler head may exceed a prescribed upper limit on a lower floor near the pressurized water supply device. In such a part, pressure reducing valve equipment is installed in front of the flowing water detection device to perform pressure reduction.

  FIG. 7 shows a conventional water flow detector provided with a pressure reducing valve facility. In FIG. 7, the flowing water detection device 100 is disposed in the branch pipe branched from the water supply main pipe to the lower floor via the gate valve 102, and the pressure reducing valve facility 104 is installed in the front stage of the flowing water detection device 100. The pressure reducing valve equipment 104 is provided with a pressure reducing valve 105, a gate valve 106 and a strainer 108 are installed on the primary side, and a gate valve 110 is also installed on the secondary side. Further, even if the pressure reducing valve 105 breaks down, a bypass pipe 112 is arranged so that pressurized fire extinguishing water can be supplied, and a gate valve 114 is provided in the bypass pipe 112.

  Normally, the gate valves 106 and 110 are in an open state, and the gate valve 114 is in a closed state, so that pressurized fire extinguishing water decompressed by the pressure reducing valve 105 is supplied to the flowing water detection device 100. When the pressure reducing valve 105 fails, the gate valve 114 is opened and pressurized fire-extinguishing water is supplied from the bypass pipe 112 to the flowing water detection device 100.

  However, when installing the pressure reducing valve, a large number of gate valves and pipes are required. As a result, there is a problem that not only the equipment space is increased, but also industrial materials such as valves and piping materials and construction man-hours are increased.

  In order to solve such a problem, a water flow detection device with a secondary pressure adjustment function shown in FIG. 8 in which a function of a pressure reducing valve facility is added to the water flow detection device has been proposed (Patent Document 1).

  In FIG. 8, the flowing water detection device with the secondary pressure regulating function is a bypass pipe that connects the primary side and the secondary side of the valve body 210 with respect to the lift type valve body 210 having the piston 211 and the cylinder chamber 215. The pressure control pilot valve 225 provided at 222 monitors the secondary side pressure of the flowing water detection device, controls the outflow of the pressurized water in the cylinder chamber 215 so that the secondary side pressure becomes the set pressure value, and The lift amount (opening) is controlled.

  In such a conventional water flow detection device with a secondary side pressure regulating function, the cylinder chamber 215 is connected to the primary side of the valve body 210 to introduce the primary side pressurized water. The pressurized water is discharged to the secondary side through the pressure regulating pilot valve 225 to lower the pressure, and the piston 211 is lifted and opened by the piston 211.

  In the normal monitoring state, when the pressure drops due to water leakage on the secondary side, the pressure regulating pilot valve 225 opens due to the pressure drop, and the pressurized water is supplied to the secondary side through the bypass path 222 to recover the set pressure value. The operation of supplying the inactive flow amount without opening the valve body 210 is performed.

  In addition, if the sprinkler operates and there is a flow of water that exceeds a certain amount in the event of a fire, the secondary pressure suddenly decreases, and the pressurized water in the cylinder chamber 215 flows out to the secondary side as the pressure regulating pilot valve 225 opens. As a result, the pressure drops rapidly, and the piston 211 is listed and the valve body 210 is opened widely. The primary side pressurized water is supplied to the secondary side to recover the set pressure value and continuously supplied. At this time, pressurized water flows into the cylinder chamber 115 from the primary side. However, the orifice 221 is provided on the primary side of the bypass path 222 to suppress the primary side pressurized water, and the pressure water in the cylinder chamber 215 flows out to the secondary side. ing.

  As described above, when the sprinkler is operated, the valve body 210 is rapidly opened by the rapid pressure reduction of the cylinder chamber 215 due to the opening of the pressure regulating pilot valve 225. After overshooting the set pressure value, it stabilizes at the set pressure value.

However, if the secondary pressure greatly exceeds the set pressure value, for example, if a resin pipe or the like is used for the secondary side piping, there is a problem in safety. Therefore, the safety valve 233 is separate from the pressure regulating pilot valve 225. To prevent high pressure from being applied to the secondary side.

Japanese Patent Laid-Open No. 11-128388

  However, in such a conventional water flow detection device with a secondary-side pressure regulating function, pressurized fire extinguishing water is not operated without operating the valve body 210 against a pressure drop such as a small amount of water leakage on the secondary side. Control of the amount of non-operating flowing water supplied from the primary side to the secondary side and the supply of pressurized water by the operation of the main valve by discharging the head in the event of a fire are performed by the same pressure regulating pilot valve 225 and bypass route, so When the primary side pressure is high as in the lower floors, the secondary side pressure greatly overshoots the set pressure value when the valve body 210 is opened, and there is a large time delay until it stabilizes. There is a problem that a high pressure exceeding the set pressure value is applied.

  The cause of such a large overshoot when the valve body is opened is that the orifice 221 is provided on the primary side of the bypass path 222. That is, when the valve body 210 is rapidly opened by opening the pressure regulating pilot valve 225 due to a decrease in the secondary pressure and the secondary pressure increases, the pressure regulating pilot valve 225 is closed when the set pressure value is exceeded, Primary side pressurized water is introduced into the cylinder chamber 215 from the bypass path 222, and the valve body 210 is driven in the closing direction by pushing down the piston 211.

  However, since the orifice 221 is provided on the primary side of the bypass passage 222, the primary pressurized water flowing into the cylinder chamber 215 is limited, the movement of the piston 210 is slow, and the responsiveness in the closing direction of the valve body 210 is reduced. As a result, a large overshoot occurs on the secondary side, and it takes time to stabilize the set pressure value.

  In particular, when the primary pressure is high, such as in the lower floors of a high-rise building, pressure reduction by the running water detector cannot be performed sufficiently, and the primary pressure is maintained until the set pressure value is stabilized after the valve is opened. Near high voltage may be applied to the secondary side.

  Thus, in order to avoid the high pressure applied to the secondary side, a separate safety valve 233 is provided, and it cannot be said that the control for maintaining the set pressure value by the control of the valve body 210 by the pressure regulating pilot valve 225 is sufficient, and the safety valve Since it is necessary to provide 233 separately, there is a problem that the apparatus configuration is complicated accordingly.

  In addition, since the pressure control pilot valve 225 is opened to allow the pressure water in the cylinder chamber 215 to flow out to the secondary side while the primary side is connected to the cylinder chamber 215 by the bypass path 222, the control pressure is reduced. Even if the primary side pressure water is restricted by 221, the discharge from the cylinder chamber 215 to the secondary side and the inflow from the primary side to the cylinder chamber 215 occur simultaneously, and the pressure water from the cylinder chamber 215 is generated. There is also a problem that the responsiveness is lowered by preventing the outflow.

The present invention is characterized by providing a water flow detection device that enables highly accurate and stable control of inactive flow rate control that does not operate the valve and active flow rate control that operates the valve.

In the running water detection device that is provided in the middle of the pipe and opens the valve when the secondary pressure drops to supply pressurized water, and the running water detection unit outputs a running water detection signal.
A main valve drive section that is provided so as to be freely housed in the cylinder chamber, and that opens and closes the main valve by controlling the supply of pressure water to the cylinder chamber;
A control valve provided in a bypass pipe that bypasses the primary side and the secondary side of the valve, and includes a non-operating flowing water mechanism and a pressure regulating pilot mechanism;
Provided,
The non-operating flowing water mechanism of the control valve separates the primary side from the secondary side when the secondary side pressure exceeds a predetermined cutoff set pressure, and 2 when the secondary side pressure drops below the cutoff set pressure. Provided with a valve mechanism for recovering the secondary pressure by supplying primary pressure water to the secondary side,
The pressure regulating pilot mechanism of the control valve communicates the primary side with the cylinder chamber until the secondary side pressure drops to a predetermined pressure setting pressure that is lower by a predetermined value than the cutoff setting pressure, and the secondary side is the primary side. When the secondary side pressure drops below the regulated pressure, the secondary side communicates with the cylinder chamber and the primary side becomes the secondary side. A valve mechanism for opening the valve by separating from the cylinder chamber is provided.

Here, the inactive flow rate valve mechanism is
A spring to set the spring load in the axial direction;
One side of the diaphragm receives the spring load of the spring and a secondary pressure is introduced into the diaphragm chamber formed on the other side of the diaphragm, and the diaphragm is displaced according to the magnitude relationship between the spring load and the secondary side pressure. Diaphragm mechanism,
A first communication path communicating the primary side and the secondary side;
A plunger penetrating the first communication path and movably disposed in the axial direction, abutting the spring at one end and abutting the diaphragm at the other end;
A valve body formed integrally with the plunger;
With
Due to the displacement of the diaphragm in one direction when the pressing force of the diaphragm due to the secondary side pressure is greater than the spring load, the flow path from the primary side to the secondary side is closed by the valve body of the plunger. When the diaphragm pressing force due to is smaller than the spring load, the displacement of the diaphragm in the reverse direction opens the valve body of the plunger and opens the flow path from the primary side to the secondary side,
The control valve pressure regulation pilot mechanism is
Forming a second communication passage communicating with each of the primary side, the secondary side and the cylinder chamber;
A plunger having a valve body that is movably housed in the same direction as the plunger of the non-operating flowing water mechanism and that switches the communication state through the second communication path;
With
As the secondary pressure decreases, the non-operating flowing water mechanism moves the plunger of the pressure regulating pilot mechanism in conjunction with the displacement of the diaphragm in one direction to separate the primary side from the secondary side and to make the cylinder chamber secondary. The valve is opened by communicating with the side, while the plunger of the pressure adjustment pilot mechanism is moved in conjunction with the displacement of the diaphragm in the reverse direction as the secondary pressure increases, and the cylinder chamber is disconnected from the secondary side. Simultaneously, the primary pressure water is introduced into the cylinder chamber to urge the valve in the closing direction.

  The plunger of the non-operating flowing water mechanism and the plunger of the pressure regulating pilot mechanism are arranged coaxially with the diaphragm interposed therebetween.

The non-operating running water mechanism
A spring to set the spring load in the axial direction;
A diaphragm that receives the spring load of the spring at one end of the diaphragm, introduces a secondary pressure into a diaphragm chamber formed at the other end of the diaphragm, and displaces the diaphragm according to the magnitude relationship between the spring load and the secondary pressure. Mechanism,
A first valve chamber introduced with primary pressure water;
A second valve chamber introduced with secondary-side pressure water;
An axial valve hole communicating the first valve chamber and the second valve chamber;
A valve seat formed at the opening of the first valve chamber of the valve hole;
A plunger that passes through the first valve chamber, the valve hole, and the second valve chamber and is arranged so as to be movable in the axial direction, with a spring in contact with one end and the diaphragm in contact with the other end;
A valve body integrally formed with the plunger and housed in the first valve chamber;
With
When the diaphragm pressing force due to the secondary side pressure is larger than the spring load, the displacement of the diaphragm in one direction closes the flow path from the primary side to the secondary side by bringing the valve body of the plunger into contact with the valve seat. When the diaphragm pressing force due to the secondary pressure is smaller than the spring load, the displacement of the diaphragm in the reverse direction causes the plunger valve element to move away from the valve seat and flow from the primary side to the secondary side. Open the road.

The control valve pressure regulation pilot mechanism is
A third valve chamber introduced with primary pressure water;
A fourth valve chamber disposed axially adjacent to the third valve chamber and introduced with secondary pressure water;
A fifth valve chamber arranged axially adjacent to the fourth valve chamber and introducing the control pressure of the main valve;
An axial first communication hole communicating the third valve chamber and the fourth valve chamber;
A first plunger which is accommodated in the first communication hole so as to be movable in the axial direction and has a valve hole in the axial direction;
A second communication hole penetrating the third valve chamber and communicating with the diaphragm chamber simultaneously with the first communication hole;
A valve seat formed at the opening of the fourth valve chamber of the second communication hole and receiving the contact of the first plunger;
A valve spring that urges the first plunger in a closing direction to contact the valve seat;
A second plunger provided in the second communication hole so as to be movable in the axial direction, having one end supported by the diaphragm and having the other end opposed to the first plunger;
With
The displacement of the diaphragm that opens the non-operating water flow valve mechanism in accordance with the decrease in the secondary pressure in one direction causes the tip of the second plunger to move in contact with the first plunger, thereby moving the third valve chamber and The flow path of the fourth valve chamber is closed to separate the primary side and the secondary side, and at the same time, the flow path of the fifth valve chamber and the fourth valve chamber is opened to connect the cylinder chamber to the secondary side and On the other hand, by moving the tip of the second plunger away from the first plunger due to the displacement of the diaphragm in the reverse direction accompanying the increase in the secondary pressure, the fifth valve chamber and the fourth valve chamber are moved. The flow path is closed to separate the cylinder chamber from the secondary side, and at the same time, the flow paths of the third valve chamber and the fourth valve chamber are opened to introduce primary side pressure water into the cylinder chamber to close the valve.

  The pressure regulating pilot mechanism is arranged on the secondary pressure surface side of the diaphragm, and only the spring load is received, so that the inactive flow rate valve mechanism is held in an open state and the secondary side of the pressure regulating pilot valve mechanism is The valve communicates with the cylinder chamber and separates the primary side from the secondary side and the cylinder chamber to keep the valve open.

  A manual release valve is provided for discharging the pressure water in the cylinder chamber of the main valve drive unit to open the main valve.

  A check valve is provided on the primary side of the bypass pipe in which the control valve is disposed, and is closed when the primary side pressure is reduced with respect to the secondary side pressure.

A constant flow valve for supplying a predetermined amount of inactive water flow is disposed in the secondary bypass pipe of the inactive water flow amount valve mechanism provided in the control valve.

  ADVANTAGE OF THE INVENTION According to this invention, pressure regulation control and non-operating flowing water amount control can be performed with a control valve provided with a non-operating flowing water mechanism and a pressure regulation pilot mechanism, and size reduction of an apparatus can be achieved.

  In addition, since the non-operating water flow mechanism and the pressure regulation pilot mechanism are provided independently, the secondary pressure is set to the set pressure value by operating this valve by the pressure regulation pilot control without being affected by the non-working water flow control. Highly responsive (confined set pressure value) can be controlled with high accuracy, and even if the primary pressure is high, the secondary pressure is greatly overshooted to a high pressure when this valve is operating. Therefore, it is not necessary to provide a safety valve to prevent the secondary side high pressure, and the device configuration can be simplified.

  In addition, by disposing a constant flow valve on the secondary side of the non-operating water flow mechanism, even if the equipment has a wide primary pressure setting range, stable non-operating water is supplied to the secondary side to provide a secondary flow. The side pressure can be restored to the set pressure value.

  Further, when the main valve of the flowing water detection device does not open for some reason, the manual opening valve can be operated to forcibly drain the pressure water in the cylinder chamber to be fully opened.

Moreover, even if the diaphragm mechanism is used to control the non-operating water flow mechanism and the pressure regulation pilot mechanism, and the diaphragm is damaged and the function is transmitted, the non-operating water flow valve mechanism and the pressure control pilot mechanism operate to the open side, Even if the pressure function is lost, the valve operates on the open side, and a fail-safe operation for reliably supplying pressure water to the secondary side is achieved.

Explanatory drawing which showed embodiment of the flowing water detection apparatus by this invention in a normal monitoring state Explanatory drawing which showed the relationship of the operation | movement of the primary side and secondary side pressure in this embodiment, a pressure regulation pilot valve mechanism, this valve, and a non-operation flow amount valve mechanism Sectional view showing the control valve of FIG. 1 in a normal monitoring state Explanatory drawing which showed embodiment of the flowing water detection apparatus in this valve operating state FIG. 4 is a sectional view showing the control valve in FIG. Sectional drawing which took out and showed the control valve of this embodiment in a non-operating flowing water state Explanatory drawing which showed the conventional flowing water detection apparatus which provided the pressure-reducing valve equipment Explanatory drawing which showed the conventional flowing water detection apparatus provided with the secondary side pressure regulation function.

  FIG. 1 is an explanatory view showing an embodiment of a flowing water detection device according to the present invention in a normal monitoring state. In FIG. 1, the flowing water detection device 10 is provided in the middle of a branch pipe on each floor branched from a water supply main pipe to which a pressurized water supply apparatus such as a high-rise building is connected.

  In the flowing water detection device 10, a primary side inlet 14 is formed below the valve body 12, and a primary side pipe 18 is connected thereto via a gate valve 16. A secondary side outlet 20 is formed on the upper side of the valve body 12, a secondary side pipe 22 is connected to the secondary side pipe 22, and a sprinkler head is connected to the end of the secondary side pipe 22.

  Inside the valve body 12, the main valve 24 is slidably incorporated by a piston 28 integrally formed on the rear side, and is in contact with a valve seat 26 formed integrally on the valve body 12 side so as to be in a normal monitoring state. Then it is closed. A piston 28 formed behind the main valve 24 is slidably incorporated in the cylinder chamber 30, and a return spring 34 for urging the piston in the closing direction is incorporated in the cylinder chamber 30.

  A pipe 36 is connected to the outside from the opening of the seat surface of the valve seat 26 provided in the valve body 12 where the main valve 24 abuts, and a pressure switch 40 is connected to the tip of the pipe 36 via a signal stop valve 38. ing. Further, the lower side of the pipe 36 is connected to the water pipe side through an auto drip 42 and a check valve 44. A pipe 45 is drawn from the secondary side of the valve body 12 and connected to a water distribution pipe, and a drain valve 46 is connected to the pipe 45. Further, an air vent valve 57 is provided on the primary side of the valve body 12.

  The pressure switch 40 functions as a flowing water detection unit. When the main valve 24 is opened, pressurized water is introduced from the inlet of the valve seat 26 through the pipe 36, and the inflow amount by the pipe 36 reduces the discharge amount of the auto drip 42. If exceeded, the timer is started by operating with pressure water added to the pressure switch 40, and a running water detection signal is output to the outside after a predetermined time.

  The piston 28 formed integrally with the main valve 24, the cylinder chamber 30, and the return spring 34 constitute a main valve driving mechanism of the main valve 24 provided in the flowing water detection device 10. It is controlled by a control valve 50 provided in a bypass pipe 48 that connects the primary side and the secondary side.

  The control valve 50 provided in the bypass pipe 48 has a valve structure in which a non-operating water flow amount valve portion 52 and a pressure regulation pilot valve portion 54 are integrally arranged on the same axis. That is, the control valve 50 is integrally provided with two valve mechanisms, that is, a non-operating water flow rate valve mechanism and a pressure regulation pilot valve mechanism.

  A check valve 56 is provided in the bypass pipe 48 on the primary side of the control valve 50 so that even if the primary side pressure decreases, the check valve 56 closes so that the secondary side pressure does not decrease. By introducing a check valve 56 into the bypass pipe 48, the entire flowing water detection device 10 has a check valve structure.

  The bypass pipe 48 is branched and connected to a non-operating water flow amount valve portion 52 and a pressure regulating pilot valve portion 54 provided in the control valve 50, and the secondary side is branched and taken out from each. Further, the cylinder chamber 30 is connected to a pressure regulating pilot valve portion 54 provided in the control valve 50 via a pipe 49, and a manual release valve 55 is connected to the pipe 49.

  The manual release valve 55 forcibly drains the pressurized water in the cylinder chamber 30 by opening the manual release valve 55 in the event of an abnormality in which the opening / closing control of the main valve 24 of the flowing water detection device 10 cannot be performed for some reason. The valve 24 can be moved to the fully open position by being pushed up by the side pressure.

  The manual release valve 55 can also be used for pipe flushing work for removing dust in the pipe during construction, or for manually removing the dust in the valve seat to fully open and removing it with water flow. .

  A constant flow valve 58 is provided in the middle of the bypass pipe for the secondary side drawn out from the non-operating water flow valve portion 52 provided in the control valve 50, and the non-operating water flow amount flowing under the control of the non-operating water flow valve portion 52. Is set to a constant flow rate. The constant flow valve 58 may be an orifice in a simple case, or a known constant flow valve that keeps the flow rate constant regardless of the input pressure may be used.

  Further, a primary pressure gauge 60 is connected to the primary side of the flowing water detection device 10, and a secondary pressure gauge 61 is connected to the secondary side.

  FIG. 2 is an explanatory diagram showing the relationship between the primary side pressure and the secondary side pressure in the present embodiment, and the operations of the pressure regulation pilot valve portion 54, the main valve 24, and the non-operating water flow amount valve portion 52. In FIG. 2, the vertical axis is the pressure P, and the cutoff setting pressure P2 that is the secondary set pressure value is set with respect to the primary side pressure P1, and the pressure adjustment pilot set pressure P3 is set at a lower position. Is set.

  The primary side pressure P1 is one point in the primary side pressure setting range A. In the case of a high-rise building, the primary side pressure P1 is high in the lower side floor in the primary side pressure range A. The higher the floor, the lower the value.

  In the normal monitoring state shown in FIG. 1, the main valve 24 is in a closed state, and at this time, the pressure in the secondary side pipe 22 is a predetermined cutoff setting pressure P2.

  In the normal monitoring state, when the secondary side pressure drops below the cut-off set pressure P2 due to water leakage or the like on the secondary side pipe 22 side, the inactive flow rate valve portion 52 that has been closed until then is opened, and the bypass pipe 48 Through the opened non-operating flow amount valve portion 52, a constant amount of non-operating flow amount determined by the constant flow valve 58 is supplied to the secondary side, and the reduced secondary pressure is restored to the cutoff setting pressure P2. . At this time, since the main valve 24 is in a closed state, the flowing water at this time is called non-operating flowing water.

  If the sprinkler head is activated due to a fire or the like and a flow of water exceeding a certain amount is generated in the secondary side piping, the secondary side pressure rapidly decreases from the cutoff pressure P2, and first the inactive flow rate valve 52 opens and bypasses. The primary side pressure water is supplied to the secondary side through the pipe 48, but this does not recover the secondary side pressure, and falls below the pressure regulation pilot set pressure P3 set at a position lower than the cutoff set pressure P2 by a predetermined value. Then, pressure control by opening the main valve 24 is started.

  Here, the pressure adjustment pilot valve unit 54 connects the primary side of the bypass pipe 48 to the cylinder chamber 30 and simultaneously disconnects the secondary side bypass pipe until the secondary side pressure drops to the pressure adjustment pilot set pressure P3. Therefore, the primary pressure water is supplied to the cylinder chamber 30 via the pressure regulating pilot valve portion 54 and the main valve 24 is closed by the pressure of the piston 28.

  In this state, when the secondary pressure decreases and becomes equal to or lower than the pressure regulation pilot set pressure P3, the pressure regulation pilot valve unit 54 communicates the cylinder chamber 30 to the secondary side and simultaneously switches the primary side from the cylinder chamber 30. It becomes a state. For this reason, the pressurized water in the cylinder chamber 30 flows out to the secondary side through the pressure regulating pilot valve portion 54, whereby the pressure in the cylinder chamber 30 is lowered and the main valve 24 is opened.

  When the main valve 24 is opened, the primary side pressurized water is supplied to the secondary side, so that the secondary side pressure is recovered. When the secondary side pressure exceeds the pressure regulation pilot set pressure P3, the main valve 24 is again closed. Thereafter, the primary side pressure water is continuously supplied to the secondary side so as to maintain the pressure regulation pilot set pressure P3 while repeatedly opening and closing the main valve 24.

  FIG. 3 is a sectional view showing the control valve of FIG. 1 in the normal monitoring state. In FIG. 3, the control valve 50 incorporates a spring 62 in the upper portion, and an inactive flow amount valve portion 52 is disposed below the spring 62. Subsequently, the control valve 50 is placed on the same axis line through a diaphragm mechanism having a diaphragm 74 and a diaphragm chamber 76. A pressure regulating pilot valve portion 54 is arranged on the lower side.

  A first valve chamber 64 that communicates with the port a to which the primary-side bypass pipe 48 is connected and a second port that communicates with the port b that connects the secondary-side bypass pipe 48a are connected to the non-operating water flow rate valve portion 52. The valve chamber 66 is disposed in the axial direction, and a plunger 68 that receives the spring load of the spring 62 is slidably disposed in a communication hole that connects the first valve chamber 64 and the second valve chamber 66. A valve body 70 is provided in the portion of the first valve chamber 64 of the plunger 68, and a valve seat 72 is formed in the opening of the valve hole on the upper side of the valve body 70.

  A diaphragm 74 is disposed below the non-operating water flow valve portion 52, a diaphragm chamber 76 is formed below the diaphragm 74, and the diaphragm chamber 76 is connected to a port d to which a secondary bypass pipe 48 b is connected. The secondary pressure water is communicated and introduced into the diaphragm chamber 76. The plunger 68 provided in the non-operating water flow amount valve portion 52 receives a spring load from the spring 62 on the upper side, and receives a pressing force due to the secondary pressure introduced into the diaphragm chamber 76 of the diaphragm 74 on the lower side.

  The pressure regulating pilot valve portion 54 disposed below the diaphragm 74 communicates with the port c connected to the primary bypass pipe 48 to form a third valve chamber 78 at the lower end portion, and the secondary side on the upper side thereof. A port connected to the cylinder chamber 30 by a pipe 49 is formed in the middle of a shaft hole communicating with the fourth valve chamber 80 and the diaphragm 74 side. e is communicated.

  An axial shaft hole is formed between the third valve chamber 78 and the fourth valve chamber 80, and a first plunger 84 is slidably incorporated in the shaft hole. The first plunger 84 has a communication hole 84 a in the axial direction, a valve portion 84 b at the upper end, and a valve spring 85.

  A second plunger 86 connected to a diaphragm 74 is slidably incorporated in a fifth valve chamber 82 serving as a shaft hole in which a port e communicating with the cylinder chamber 30 is formed. In the illustrated normal monitoring state, the tip is disposed at a position away from the first plunger 84, so that the first plunger 84 is in a closed position in which the valve portion 84 b is in contact with the valve seat by the valve spring 85. Is retained.

  In the control valve 50 in such a normal monitoring state, a spring load by the spring 62 is applied to the diaphragm 74 via the plunger 68, and simultaneously, an upward force due to the secondary pressure introduced into the diaphragm chamber 76 is applied, The diaphragm 74 is positioned at the position shown in the figure determined by the balance between the spring load and the force due to the secondary pressure, and the position of the diaphragm 74 in the normal monitoring state, that is, the secondary pressure is the cutoff set pressure P2 shown in FIG. In some cases, the valve body 70 of the plunger 68 is brought into contact with the valve seat 72 to close the flow paths on the primary side and the secondary side, and the non-operating water flow amount valve portion 52 is placed in a closed state.

  On the other hand, in the lower pressure regulating pilot valve portion 54, the tip end of the second plunger 86 is in the valve hole at the position of the diaphragm 74 in the normal monitoring state, and the valve seat at the opening of the valve hole. On the other hand, the first plunger 84 is brought into contact with the valve spring 85 to be in a closed state.

  For this reason, the primary-side port c communicates with the cylinder chamber 30 from the third valve chamber 78, the communication hole 84 a of the first plunger 84, and the port e of the fifth valve chamber 85 via the pipe 49. Pressure water is added to the cylinder chamber 30 shown in FIG.

  On the other hand, the secondary port d is closed by the contact of the valve portion 84b of the first plunger 84, and the secondary port d is separated from the primary port c and the cylinder chamber 30. It is. Therefore, in the normal monitoring state, as shown in FIG. 1, the main valve 24 of the flowing water detection device 10 is placed in a closed state in which the cutoff pressure P2 is maintained on the secondary side.

  FIG. 4 is an explanatory view showing an embodiment of the flowing water detection device in the valve operating state. In FIG. 4, the sprinkler head provided on the secondary side pipe 22 side is activated by a fire to discharge water, and the secondary side pressure rapidly decreases due to water discharge from the sprinkler head.

  When the secondary side pressure decreases, as shown in FIG. 2, when the pressure falls below the cutoff setting pressure P <b> 2, the non-operating water flow valve portion 52 of the control valve 50 is opened, and the secondary side pressure is returned to the secondary side via the bypass pipe 48. Although non-operating running water is flowed, the pressure on the secondary side is not recovered by this alone, and the secondary pressure is further reduced.

  When the secondary side pressure falls below the pressure regulation pilot set pressure P3 shown in FIG. 2, the pressure regulation pilot valve portion 54 operates to disconnect the primary side and communicate the cylinder chamber 30 to the secondary side. The pressure water in the cylinder chamber 30 flows out to the secondary side through the pressure regulating pilot valve portion 54, thereby lowering the pressure in the cylinder chamber 30, and the valve 24 is pushed by the primary side pressure to open. Supply secondary pressurized water to the secondary side.

  FIG. 5 is a sectional view showing the control valve of FIG. 4 taken out in the valve operating state. In FIG. 5, the secondary pressure is in a state where it has dropped below the pressure regulation pilot set pressure P <b> 3 shown in FIG. 2, and in this state, the secondary pressure applied to the diaphragm chamber 76 is reduced. With respect to the force, the spring load by the spring 62 overcomes, the diaphragm 74 moves downward, and the diaphragm 74 moves the second plunger 86 downward while the open state of the inactive flow amount valve portion 52 is continued. The first plunger 84 is pushed down by the tip of the second plunger 86.

  As a result, the communication passage 84a of the first plunger 84 is closed, and at the same time, the valve portion 84b is separated from the valve seat of the opening portion. Therefore, the port e communicating with the cylinder chamber 30 communicates with the port d of the secondary bypass pipe 48b, and at the same time, the primary port c side is disconnected from the secondary side and the cylinder chamber 30 side. For this reason, the pressurized water in the cylinder chamber 30 shown in FIG. 4 flows in from the port e, flows out to the secondary side through the port d, and the pressure in the cylinder chamber 30 rapidly decreases as the pressure in the secondary side decreases. Then, the opening operation of the main valve 24 is performed.

  When the main valve 24 is opened, the secondary side pressure is restored by the supply of the primary side pressurized water to the secondary side, and when the secondary side pressure is restored to the pressure regulation pilot set pressure P3 shown in FIG. The diaphragm displaced downward lifts upward, releases contact with the first plunger 84, closes the secondary port d by communicating the primary port c with the port e of the cylinder chamber 30. As a result, the primary pressure is supplied to the cylinder chamber 30, thereby closing the main valve 24 opened by pressing the piston 28 and stopping the supply of pressurized water to the secondary side.

  At this time, the valve body 70 provided in the non-operating water flow amount valve portion 52 does not return to the position where it abuts on the valve seat 72, and the non-operating water flow amount valve portion 52 maintains the open state. Thereafter, while water discharge from the secondary side sprinkler head continues, the pressure adjustment pilot valve unit 54 repeats the opening / closing control of the main valve 24 so as to maintain the pressure adjustment pilot set pressure P3 of FIG. .

  FIG. 6 is a cross-sectional view showing the control valve of the present embodiment in a non-operating flowing water state. In FIG. 6, in the non-operating flowing water state, the secondary side pressure falls below the cut-off set pressure P <b> 2 in FIG. 2 due to secondary side water leakage or the like in the normal monitoring state shown in FIG. 1. In this case, the secondary pressure on the diaphragm chamber 76 is pushed by the spring load of the spring 62, and the diaphragm 74 moves downward relative to the normal monitoring state shown in FIG.

  Along with this, the first plunger 68 descends and separates the valve element 70 from the valve seat 72, thereby opening the port a communicating with the primary side and the port b communicating with the secondary side, and passing through the bypass pipe 48. Run pressurized water on the secondary side. As shown in FIG. 1, the pressurized water flowing to the secondary side has a constant flow rate determined by a constant flow valve 58 provided in the secondary bypass pipe of the non-operating water flow amount valve portion 52.

  When the non-operating running water is applied to the secondary side, the lowered secondary pressure is recovered, and the diaphragm 74 is positioned in the normal monitoring state shown in FIG. 3 when the shut-off set pressure P2 shown in FIG. The valve body 70 is brought into contact with the valve seat 72 to be in a closed state in which communication between the primary side and the secondary side is blocked.

  Next, the operation when the diaphragm 74 is torn in the normal monitoring state shown in FIG. 3 will be described. If the diaphragm 74 is torn due to aging, etc., the secondary pressure water for the diaphragm chamber 76 leaks, and the force that pushes the diaphragm 74 upward by the secondary pressure water is lost. For this reason, the diaphragm 74 receives only the spring load from the spring 62 and is pushed downward.

  When the diaphragm 74 is pushed to the lower contact position by the spring 62, the valve body 75 of the plunger 68 is separated from the valve seat 72 in the inoperative flow amount valve portion 52, so that the primary side communicates with the secondary side. Thus, the bypass flow path 48 is communicated with the secondary side via the non-operating water flow amount valve portion 52.

  In the pressure regulating pilot valve portion 54, the second plunger 86 pushes down the first plunger 84 by lowering to the contact position of the diaphragm 74, and the port e of the cylinder chamber 30 is communicated with the secondary port d. On the other hand, the primary side port c is disconnected, and the cylinder chamber 30 is always in communication with the secondary side.

  For this reason, if the sprinkler head is activated due to a fire, the pressurized water in the cylinder chamber is discharged to the secondary side due to the drop in the secondary side pressure water, the pressure in the cylinder chamber 30 rapidly drops, and the valve 24 is fully opened. The primary side pressurized water can be continuously supplied to the secondary side.

  Thus, even if the diaphragm 74 provided in the control valve 50 is damaged, the non-operating water flow rate valve portion 52 and the pressure regulating pilot valve portion 54 are both on the fail-safe side for supplying the primary side pressurized water to the secondary side. When the diaphragm 74 is operated and the sprinkler is actuated at the time of water leakage or fire, the water flow detection device 10 operates reliably and a fail-safe operation for supplying pressurized water to the secondary side can be realized.

  In the above embodiment, the constant flow valve 58 is provided in the secondary bypass pipe of the non-operating flow rate valve portion 52 provided in the control valve 50, but the primary pressure range is not wide. In the case of equipment that is determined in a determined manner, the constant flow valve 58 may not be provided.

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.

10: Flowing water detection device 12: Valve body 18: Primary side pipe 22: Secondary side pipe 24: Main valve 26: Valve seat 28: Piston 30: Cylinder chamber 34: Return spring 48: Bypass pipe 50: Control valve 52: Non-operating water flow rate valve portion 54: pressure regulating pilot valve portion 58: constant flow valve 62: spring 68: plunger 84: first plunger 84a: communication hole 84b: valve portion 86: second plungers a to e: ports

Claims (8)

In the running water detection device that is provided in the middle of the pipe and opens the valve when the secondary pressure drops to supply pressurized water, and the running water detection unit outputs a running water detection signal.
The main valve is provided so as to be freely housed in a cylinder chamber, and a main valve drive unit that opens and closes the main valve by supply of pressure water to the cylinder chamber;
A control valve provided in a bypass pipe that bypasses the primary side and the secondary side of the main valve, and includes a non-operating flowing water mechanism and a pressure regulating pilot mechanism;
Provided,
When the secondary side pressure exceeds a predetermined cutoff set pressure, the non-operating flowing water mechanism of the control valve separates the primary side from the secondary side, and the secondary side pressure drops below the cutoff set pressure. A valve mechanism for recovering the secondary pressure by supplying primary pressure water to the secondary side,
The pressure regulating pilot mechanism of the control valve communicates the primary side with the cylinder chamber and lowers the secondary side until the secondary pressure drops to a predetermined pressure setting pressure that is lower than the cut-off set pressure by a predetermined value. The valve is separated from the primary side and the cylinder chamber to urge the valve in the closing direction. When the secondary side pressure falls below the pressure setting pressure, the secondary side communicates with the cylinder chamber and the primary side. A flowing water detection device comprising a valve mechanism for opening the main valve by separating a side from the secondary side and the cylinder chamber.
In the flowing water detection device according to claim 1,
The inactive flowing water mechanism is
A spring to set the spring load in the axial direction;
One side of the diaphragm receives the spring load of the spring, and a secondary pressure is introduced into a diaphragm chamber formed on the other side of the diaphragm, and according to the magnitude relationship between the spring load and the secondary side pressure. A diaphragm mechanism for displacing the diaphragm;
A first communication path communicating the primary side and the secondary side;
A plunger penetrating the first communication path and movably disposed in the axial direction, abutting the spring at one end and abutting the diaphragm at the other end;
A valve body formed integrally with the plunger;
With
Due to the displacement of the diaphragm in one direction when the pressing force of the diaphragm due to the secondary side pressure is greater than the spring load, the flow path from the primary side to the secondary side is closed by the valve body of the plunger. When the diaphragm pressing force due to the secondary side pressure is smaller than the spring load, the plunger is opened in a reverse direction to open the plunger valve body and open the flow path from the primary side to the secondary side;
The pressure regulating pilot mechanism of the control valve is
Forming a second communication passage communicating with each of the primary side, the secondary side, and the cylinder chamber;
A plunger having a valve body that is movably housed in the same direction as the plunger of the non-operating flowing water mechanism and that switches the communication state through the second communication path;
With
As the secondary side pressure decreases, the plunger of the pressure regulating pilot mechanism is moved in conjunction with the displacement of the diaphragm in one direction of the diaphragm, thereby separating the primary side and the secondary side and the cylinder. The chamber is communicated with the secondary side to open the valve, while the plunger of the pressure regulating pilot mechanism is moved in conjunction with the displacement of the diaphragm in the reverse direction as the secondary side pressure increases. A water flow detection device characterized in that the chamber is separated from the secondary side and simultaneously the primary pressure water is introduced into the cylinder chamber to urge the valve in the closing direction.
In the flowing water detection device according to claim 2,
The water flow detection device according to claim 1, wherein the plunger of the non-operating water flow mechanism and the plunger of the pressure regulating pilot mechanism are arranged coaxially with the diaphragm interposed therebetween.
In the flowing water detection device according to claim 1,
The inactive flowing water mechanism is
A spring to set the spring load in the axial direction;
One side of the diaphragm receives the spring load of the spring, and a secondary pressure is introduced into a diaphragm chamber formed on the other side of the diaphragm, and according to the magnitude relationship between the spring load and the secondary side pressure. A diaphragm mechanism for displacing the diaphragm;
A primary side and a secondary side valve chamber;
An axial valve hole communicating the first valve chamber and the second valve chamber;
A plunger penetrating the first valve chamber, the valve hole, and the second valve chamber, being arranged to be movable in the axial direction, abutting the spring at one end and abutting the diaphragm at the other end;
A valve body formed integrally with the plunger and housed in the first valve chamber;
With
Due to the displacement of the diaphragm in one direction when the pressing force of the diaphragm due to the secondary pressure is greater than the spring load, the plunger valve element abuts the valve seat and flows from the primary side to the secondary side. The passage is closed, and when the diaphragm pressing force by the secondary side pressure is smaller than the spring load, the valve body of the plunger is moved away from the valve seat and moved from the primary side by the displacement in the opposite direction of the diaphragm. Open the flow path to the side,
The pressure regulating pilot mechanism of the control valve is
A third valve chamber introduced with primary pressure water;
A fourth valve chamber axially disposed adjacent to the third valve chamber and introduced with secondary pressure water;
A fifth valve chamber disposed axially adjacent to the fourth valve chamber and introducing the control pressure of the main valve;
An axial first communication hole communicating the third valve chamber and the fourth valve chamber;
A first plunger which is accommodated in the first communication hole so as to be movable in the axial direction and has a valve hole in the axial direction;
A second communication hole penetrating the third valve chamber and communicating with the diaphragm chamber simultaneously with the first communication hole;
A valve seat that is formed at the opening of the fourth valve chamber of the second communication hole and receives the contact of the first plunger;
A valve spring that biases the first plunger in a closing direction in contact with the valve seat;
A second plunger provided in the second communication hole so as to be movable in the axial direction, having one end supported by the diaphragm and having the other end opposed to the first plunger;
With
By moving the diaphragm in one direction to open the non-operating flowing water mechanism as the secondary side pressure decreases, the tip of the second plunger is brought into contact with the first plunger to move the third plunger. The flow path between the valve chamber and the fourth valve chamber is closed to separate the primary side and the secondary side, and at the same time, the flow path between the fifth valve chamber and the fourth valve chamber is opened to communicate the cylinder chamber to the secondary side. The valve is opened, and on the other hand, by moving the tip of the second plunger away from the first plunger due to the displacement of the diaphragm in the reverse direction accompanying the increase in the secondary pressure, The cylinder chamber is disconnected from the secondary side by closing the flow paths of the five valve chamber and the fourth valve chamber, and at the same time, the flow path of the third valve chamber and the fourth valve chamber is opened to supply the primary pressure water to the cylinder. Flowing water detection characterized by introducing this valve into the room and closing the valve Location.
5. The flowing water detection device according to claim 2, wherein the pressure regulating pilot mechanism is arranged on a secondary pressure surface side of the diaphragm, and the diaphragm is damaged by receiving only the spring load. The working water flow mechanism is held in communication, the secondary side of the pressure regulating pilot mechanism is connected to the cylinder chamber, and the primary side is separated from the secondary side and the cylinder chamber to hold the valve open. A running water detection device characterized in that
2. The water flow detection device according to claim 1, further comprising a manual release valve that discharges the pressure water in the cylinder chamber of the main valve drive unit to open the main valve.
The flowing water detection device according to claim 1, wherein a check valve is provided on a primary side of the bypass pipe in which the control valve is disposed, and is closed when the primary side pressure is reduced with respect to the secondary side pressure. A featured water detection device.
  2. The water flow detection device according to claim 1, wherein a constant flow valve for supplying a predetermined amount of inactive water flow is disposed in a secondary bypass pipe of an inactive water flow mechanism provided in the control valve. Detection device.

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