JP5997032B2 - Water discharge pressure control device - Google Patents

Description

The present invention relates to a water discharge pressure control device for a water discharge gun system that sprays water for fire extinguishing toward a fire source position in a monitoring area.

  Conventionally, a water gun system has been installed as a fire extinguishing equipment for facilities having a wide surveillance area such as a stadium and an exhibition hall. The water cannon system monitors the monitored area by optical horizontal and vertical scanning by a scanning fire source detector, detects fire from the light reception signal due to the energy of the fire flame, calculates the fire source position, and discharges the water. The gun is directed to the fire source position by horizontal turning, and fire extinguishing water is sprinkled by controlling the water discharge pressure according to the distance to the fire source.

  The water discharge pressure control of the water discharge gun detects the water discharge pressure of the water discharge gun with a pressure sensor, and pressurizes the water discharge gun so that the deviation from the target water discharge pressure set based on the distance to the fire source is zero. Feedback control is performed on the opening degree of the motor-operated valve provided in the pipe for supplying fire-fighting water.

JP 2006-223440 A JP 2004-248934 A JP 2004-261478 A

  However, in such conventional water discharge pressure control, when the electric valve is feedback-controlled so as to eliminate the deviation from the target water discharge pressure by detecting the water discharge pressure by the pressure sensor provided in the water discharge gun, Since the valve body is opened and closed by motor drive, there is a time delay until the deviation from the target water discharge pressure disappears by changing to the required valve opening, and quick automatic pressure regulation control for fluctuations in flow rate and pressure There is a problem that can not be.

An object of this invention is to provide the water discharge pressure control apparatus which enables quick automatic pressure regulation control with respect to the fluctuation | variation of flow volume and pressure.

(Water discharge pressure control device)
The present invention provides a water discharge pressure control device,
An opening provided 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,
A pressure adjusting valve that adjusts a valve opening of the open valve so as to maintain a secondary pressure of the open valve at a predetermined set pressure set based on a spring load of a pressure setting spring;
An actuator for changing the set pressure of the pressure regulating valve by changing the spring load by the displacement of the pressure setting spring;
A pressure detector for detecting a secondary side pressure of the release valve;
A control unit configured to control the actuator so as to keep the secondary pressure detected by the pressure detector at a predetermined target pressure and set the target pressure in the pressure regulating valve;
It is provided with.

(Feedback control)
The control unit feedback-controls the actuator so as to eliminate the deviation between the secondary pressure detected by the pressure detector and the predetermined target water discharge pressure.

(Details of feedback control)
The actuator displaces the pressure setting spring of the pressure adjustment valve by driving the motor,
The control unit feedback-controls the motor of the actuator so as to eliminate the deviation between the target water discharge pressure and the secondary pressure detected by the pressure sensor.

  According to the water discharge pressure control apparatus of the present invention, the actuator motor is driven to reduce the pressure between the target water discharge pressure corresponding to the water discharge distance to the fire source position and the secondary pressure detected by the pressure detector. Electrical automatic pressure control (electric feedback control) that controls the set pressure of the regulating valve to keep it at the target discharge pressure, and keeps the secondary side pressure of the release valve at the target discharge pressure set in the pressure adjustment valve In order to adjust the valve opening of the release valve, a mechanical automatic pressure control with high response speed (mechanical feedback control) is provided. If the flow rate or pressure fluctuates under pressure control, the secondary pressure fluctuated by mechanical automatic pressure control with high response speed is converged to the target discharge pressure, and the secondary pressure of the release valve is targeted. Ensures reliable discharge pressure It makes it possible to be.

  In addition, mechanical automatic pressure regulation control uses the water pressure of the fire-extinguishing water to adjust the opening of the open valve, so that the set pressure of the pressure adjustment valve is controlled to the target discharge pressure by driving the motor. Compared with the automatic electric pressure regulation control, a high response speed can be obtained, and it is possible to reliably stabilize the water discharge pressure of the water discharge gun to the target water discharge pressure against fluctuations in the flow rate and pressure.

In addition, the automatic electric pressure regulation control displaces the pressure setting spring of the pressure adjustment valve by driving the motor of the actuator, and changes the spring load to control the set pressure to the target water discharge pressure. Therefore, the actuator can be small in size, and the actuator can be downsized significantly compared to the motor drive of the conventional motorized valve, thereby increasing the response speed of electrical automatic pressure control. It can also be increased.

Explanatory drawing which showed embodiment of the discharge pressure control apparatus by this invention Explanatory drawing which took out the on-off valve of FIG. 1, a pressure regulation valve, and the electric automatic pressure regulation control system, and showed the detail Explanatory drawing showing details of actuator together with pressure regulating valve Explanatory drawing showing the pressure regulating valve in symbolic representation The flowchart which showed an example of the electric automatic pressure regulation control by a control part Time chart showing sinusoidal deviation and actuator motor drive

[Outline of water discharge pressure control device]
FIG. 1 is an explanatory view showing an embodiment of a water discharge pressure control apparatus according to the present invention. In this embodiment, four water discharge gun systems are provided, but only one of them is shown.

  The water cannon 10 is mounted on a gantry 12 so as to be rotatable in a horizontal direction via a horizontal rotation unit 14. The water cannon 10 is angled with an elevation angle θ (for example, around 25 °) that gives the maximum flight distance in the vertical direction.

  The water discharge gun 10 is supplied with fire-fighting water pressurized by a fire-extinguishing pump (not shown) through a water supply pipe 16 and compressed air through an air pipe 18. The compressed air supplied from the air pipe 18 is blown around the fire extinguishing water in the water discharge gun 10, and by blowing this compressed air, a long distance and a wide spray area can be secured with a low discharge pressure and a small discharge amount.

  An open valve 20 is disposed in the water supply pipe 16. The open valve 20 supplies the water for fire extinguishing with the secondary side pressure, which is reduced in the primary side pressure according to the valve opening degree, to the water spray gun 10 to spray water.

  A pressure regulating valve 22 is provided for the release valve 20. The pressure regulating valve 22 is a secondary valve of the release valve 20 so as to keep the water discharge pressure of the water discharge gun 10 as the secondary pressure of the release valve 20 at a predetermined target water discharge pressure corresponding to the water discharge distance to the fire source position. Performs automatic mechanical pressure regulation to adjust the side pressure. As will be described later, the pressure regulating valve 22 includes a pressure setting spring that determines a set pressure based on the spring load.

  An actuator 24 for changing the set pressure is provided for the pressure regulating valve 22 in order to enable electric automatic pressure regulation control. The actuator 24 has a mechanism for converting the rotational force of the motor into a linear motion. By changing the displacement of the pressure setting spring provided on the pressure adjusting valve 22, the spring load can be changed and the set pressure can be changed according to the spring load. It is said. Further, the pressure sensor 26 for detecting the secondary side pressure is provided in the release valve 20, but the pressure sensor 26 may be provided in the water discharge gun 10 to detect the water discharge pressure of the water discharge gun 10.

  The control unit 28 receives a predetermined target water discharge pressure signal Pi output from the operation panel 32 and a secondary detection pressure signal P detected by the pressure sensor 26, and detects a secondary side detected by the pressure sensor 26. The actuator 24 is feedback-controlled so as to eliminate the deviation ΔP between the pressure signal P and the target water discharge pressure signal Pi, thereby displacing the pressure setting spring of the pressure regulating valve 22 to set the set pressure based on the spring load to the target water discharge pressure Pi. Maintain electrical automatic pressure control.

  Accordingly, the pressure regulating valve 22 controls the valve opening degree of the release valve 20 and performs mechanical automatic pressure regulation control for maintaining the secondary pressure supplied to the water discharge gun 10 at the target water discharge pressure Pi. The target water discharge pressure signal Pi and the detected pressure signal P may be hereinafter referred to as a target water discharge pressure Pi and a detected pressure P.

  Here, the actual water discharge pressure of the water discharge gun 10 is a pressure obtained by subtracting the loss due to the pipe length from the detected pressure P on the secondary side detected by the pressure sensor 26, and therefore the target water discharge pressure Pi output from the operation panel 32. Is a pressure obtained by adding the above loss to the target water discharge pressure corresponding to the water discharge distance to the fire source position. When the pressure sensor 26 is provided in the water discharge gun 10, the water discharge pressure of the water discharge gun 10 may be considered to be equal to the target water discharge pressure Pi.

  The fire source detector 30 is installed, for example, in a place where the monitoring area can be seen from above, and scans the monitoring area to detect a fire occurrence position. As the scanning of the fire source detector 30, for example, the detection unit is intermittently rotated and scanned every predetermined step in the horizontal direction, and further, the vertical scanning is performed by the vertical rotation of the reflecting mirror built in each step. Detect the reflected energy from the flame.

  An operation panel 32 is provided for the water cannon 10. A control unit 28, a fire source detector 30, a monitor 34, and a speaker 44 are connected to the operation panel 32 by signal lines. The speaker 44 outputs a predetermined notification sound by a signal from the operation panel 32, and the monitor 34 displays a predetermined image by a signal from the operation panel 323.

  When the operation panel 32 confirms the fire source position based on the detection signal output from the fire source detector 30, the operation panel 32 directs the water gun 10 so that the fire extinguishing water is sprayed on the fire source position, and fire A target water discharge pressure signal Pi corresponding to the set water discharge distance corresponding to the source position is output to the control unit 28. The output of the target water discharge pressure signal Pi to the control unit 28 is performed when the key switch 40 described later is switched from “localization” to “water discharge”. An automatic water discharge function that does not require the operation of the key switch 40 may be installed.

  In the normal monitoring state, the operation panel 32 displays a monitoring area plan on the display screen of the monitor 34, and marks indicating the set positions of the water gun 10 and the fire source detector 30 are also included in the monitoring area plan view. When a fire is detected by the fire source detector 30, the fire source position determined by the horizontal scanning angle and the vertical scanning angle indicating the fire source position is displayed as a fire source position mark in the monitoring area plan view. . The operation panel 32 outputs a notification sound signal to the speaker 44 to output a notification sound.

  The front left panel 32a of the operation panel 32 has a gun switching button 35 for selecting any one of the four water spray guns 10 set in the monitoring area, and the water discharge distance is long distance, medium distance, short distance. A distance setting button 36 for switching to the three stages and a rotation operation button 38 for rotating the water gun 10 clockwise or counterclockwise are provided to enable manual operation of the water gun system.

  The front right panel 32b of the operation panel 32 is provided with a key switch 40 for starting and stopping water discharge and a manual setting switch 42 for releasing the prohibition of key insertion into the key switch 40. The key switch 40 is normally configured so that the key cannot be inserted. However, when the detection signal from the fire source detector 30 is received or when the manual setting switch 42 is pressed, the insertion prohibition is released. When the key is inserted and turned from the “localization” position to the “water discharge” position, a fire pump (not shown) is activated and a target water discharge pressure signal Pi is output to the control unit 28 for selection. Water discharge is started from the discharged water gun 10. Further, when the key is turned clockwise from the “water discharge” position and set to the “stop” position, the water discharge is stopped.

[Configuration of water discharge pressure control device]
FIG. 2 is an explanatory view showing the details of the on-off valve, the pressure regulating valve, and the electric automatic pressure control system of FIG.

(Configuration of open valve)
As shown in FIG. 2, the release valve 20 includes a valve main body 50 and a valve driving unit 51. The valve body 50 includes a primary side inlet 46 to which pressurized water from the water supply pipe 16 is supplied and a secondary side outlet 48 that connects the water discharge gun side, and a valve is provided in a valve hole of an internal partition wall that partitions the two. A seat 54 is formed.

  The valve drive unit 51 slidably houses a piston 56 in a cylinder 58, attaches a valve body 52 to a tip portion extending from the piston 56 into the valve body 50, and opens and closes the valve body 52 with respect to the valve seat 54. Supports freely. A stem 60 is connected to the valve body 52 in the axial direction. The stem 60 is taken out from the upper part of the cylinder 58 to guide the stroke of the piston 56. The valve body 52 is attached to the upper part of the piston 56 in the closing direction. A spring 62 is provided.

  An input / output port 63 communicates with one cylinder chamber 58 a partitioned by the piston 56, and pressurized fire-extinguishing water (hereinafter referred to as “pressurized water”) is supplied to the cylinder chamber 58 a from here to resist the spring 62. Then, the piston 56 is stroked upward in the figure, the valve body 52 is separated from the valve seat 54, the release valve 20 is opened, the pressurized water is discharged from the input / output port 63, and the piston 56 is stroked downward in the figure by the spring 62. Then, the valve body 52 is brought into contact with the valve seat 54 to close the release valve 20.

  The release valve 20 reduces the primary pressure of the pressurized water supplied to the inlet 46 by a differential pressure (loss) generated according to the valve opening degree of the valve body 52 with respect to the valve seat 54. Pressurized water of pressure is supplied from the outlet 48 to the water discharge gun.

[Configuration of mechanical automatic pressure control system]
The mechanical automatic adjustment pressure control system that regulates the water discharge pressure of the release valve 20 includes a pressure adjustment valve 22, an actuator 24, a manual activation valve 64, and an automatic drain valve 66. The manual start valve 64 is closed in a steady monitoring state, and is manually opened at the time of test water discharge, etc., and the pressurized water on the primary pressure side is supplied as an open pressure to the cylinder chamber 58a of the open valve 20 to forcibly open the valve. When the opening 20 is closed and the test water is discharged, the supply of pressurized water to the cylinder chamber 58a is stopped and the release valve 20 is closed. The automatic drain valve 66 is opened when the secondary side pressure drops below a predetermined pressure due to the closing of the open valve 20 and allows the residual water on the secondary side to flow to the drain side.

(Configuration of pressure regulating valve)
The pressure adjustment valve 22 includes a pressure setting spring 70, a diaphragm 72, a valve portion 80, and a spring 85. The pressure setting spring 70 has one end abutting the drive shaft of the actuator 24 and the other end abutting the diaphragm 72, and is displaced in the axial direction by the drive shaft of the actuator 24 to change the spring load applied to the diaphragm 72. A set pressure for adjusting the secondary pressure of the release valve 20 is determined based on the spring load.

  Liquid chambers 74.76, 78 are formed below the diaphragm 72, and a rod having one end fixed to the diaphragm 72 passes through the orifice between the liquid chamber 74 and the liquid chamber 76 and at the boundary between the liquid chambers 76, 78. The valve body of the provided valve portion 80 is fixed, and is further in contact with a spring 85 disposed in the liquid chamber 78. The liquid chamber 78 is connected to the primary side of the release valve 20 and supplied with primary-side pressurized water. The liquid chamber 76 is connected to the cylinder chamber 58a of the release valve 20 by piping. The liquid chamber 74 is connected to the secondary side of the release valve 20, and this pipe is further connected to the automatic drain valve 66 and the pressure sensor 26.

  3A and 3B, the pressure regulating valve 22 has two switching positions divided into upper and lower parts, and these switching positions correspond to the spring load of the pressure setting spring 70 provided on the lower side. , And the balance of force due to the secondary pressure applied to the upper pilot port PL. Since the spring load of the pressure setting spring 70 can be changed by the actuator 24, the variable function by the actuator 24 is indicated by an arrow.

  The pressure adjustment valve 22 adjusts the spring load by the displacement of the pressure setting spring 70 by the actuator 24, and thereby a predetermined target water discharge pressure is set.

  In the water discharge operation of the water discharge gun 10 by the operation panel 32 shown in FIG. 1, first, a fire pump (not shown) is activated to supply pressurized water to the primary side of the release valve 20, and then the target water discharge pressure signal Pi is sent to the control unit 28. And the control to set the target water discharge pressure Pi to the pressure regulating valve 22 by driving the actuator 24 is performed.

  For this reason, when pressurized water is supplied from the fire pump to the primary side of the release valve 20, the pressure setting spring 70 is not displaced by the actuator 24 at this time, and the spring load is at an initial position of substantially zero. The valve portion 80 is closed by the force of the spring 78. In this state, pressurized water is added to the primary pressure port P1 as the fire pump is started. However, since the valve portion 80 is closed, pressurized water is not supplied from the cylinder port CL to the cylinder chamber 58a of the release valve 20, and the release valve 20 Keeps closed.

  Subsequently, when the target water discharge pressure signal Pi is output from the operation panel 32 to the control unit 28, the actuator 24 is driven to displace the pressure setting spring 70 of the pressure regulating valve 22 to increase the spring load, and the target water discharge pressure Pi. Is set.

  Therefore, as the spring load of the pressure setting spring 70 increases, the valve portion 80 is opened against the spring 85, and the pressurized water flowing in from the primary pressure port P1 is released from the opened valve portion 80 through the cylinder port CL. It is supplied to the cylinder chamber 58a of the valve 20, the piston 56 is stroked upward in the figure against the spring 62, the valve body 52 is driven to open away from the valve seat 54, and pressurized water is supplied to the secondary side to discharge the water gun. Start watering from 10.

  Since the force due to the secondary pressure is smaller than the force due to the pressure setting spring 70 which sets the target water discharge pressure Pi at the stage when the opening drive of the release valve 20 has started, the pressure adjustment valve 22 is switched as shown in FIG. The primary pressure port P1 communicates with the cylinder port CL, and the pressurized water is supplied to the cylinder chamber 58a of the release valve 20 to continue the opening drive of the release valve 20.

  When the opening drive of the release valve 20 proceeds and the secondary side pressure increases, and the secondary side pressure applied to the pilot port PL of the pressure regulating valve 22 becomes higher than the target water discharge pressure Pi set by the spring load of the pressure setting spring 70, The pressure adjustment valve 22 is switched to the switching position shown in FIG.

  At this switching position, the primary pressure port P1 is disconnected from the cylinder port CL, and the cylinder port CL is in communication with the secondary pressure port P2. For this reason, the pressurized water that has been the primary side pressure in the cylinder chamber 58a flows out to the secondary side due to the differential pressure with the lower secondary side pressure of the release valve 20 at that time, thereby the pressure in the cylinder chamber 58a. The pressure decreases, the piston 56 strokes downward in the figure to close the valve body 52 under the force of the spring 62, and the opening degree of the valve body 52 decreases, so that the depressurization increases and the secondary pressure is set to the target water discharge pressure. Thus, automatic pressure regulation control is performed to keep the secondary side pressure of the release valve 20 at a predetermined target water discharge pressure Pi.

(Configuration of actuator)
FIG. 4 is an explanatory view showing details of the actuator 24 together with the pressure regulating valve 22. As shown in FIG. 4, the actuator 24 includes a motor 82, a gear train 84, a screw shaft 86, a slider 88, a detent 90, a guide rod 92, and a drive shaft 94, and is attached to the pressure adjustment valve 22 by an attachment member 96. It is fixed.

  The actuator 24 converts the rotation of the motor 82 into a linear motion of the drive shaft 94, displaces the pressure setting spring 70 of the pressure regulating valve 22, changes the spring load applied to the diaphragm 72, and changes the set pressure.

  The rotation of the motor 82 is decelerated by the gear train 84 and rotates the screw shaft 86. A slider 88 having a screw hole is screwed into the screw shaft 86, and a detent 90 integrally formed on the outside of the slider 88 is fitted into the guide rod 92. Thus, when the screw shaft 86 rotates, the slider 88 advances and retreats according to the rotation direction, and the pressure setting spring 70 of the pressure adjusting valve 22 is displaced by the drive shaft 94 connected to the slider 88.

  Here, the rotational direction of the motor 82 that pushes out the drive shaft 94 to increase the spring load of the pressure setting spring 70 of the pressure adjustment valve 22 to increase the set pressure is set to the normal rotation, and the drive shaft 94 is pulled in to retract the pressure adjustment valve 22. The rotation direction of the motor 82 that decreases the spring load of the pressure setting spring 70 and lowers the set pressure is reverse rotation.

[Electric automatic pressure control system configuration]
As shown in FIG. 1, an electric automatic adjustment pressure control system for adjusting the discharge pressure of the release valve 20 by controlling the set pressure of the pressure adjustment valve 22 to the target discharge pressure by the displacement of the pressure setting spring 70 is shown in FIG. 32, a control unit 28, an actuator 24, a pressure adjustment valve 22, and a pressure sensor 26.

(Configuration of control unit)
As shown in FIG. 2, the control unit 28 sets the detected pressure signal P on the secondary side detected by the pressure sensor 26 according to the water discharge distance to the fire source position output from the operation panel 32 shown in FIG. The actuator 24 is controlled so as to maintain the predetermined target water discharge pressure signal Pi, thereby displacing the pressure setting spring 70 of the pressure adjusting valve 22 to change the spring load so that the set pressure becomes the target water discharge pressure.

The control unit 28 includes an addition unit 100, a feedback control unit 102, and a motor drive unit 104. The adding unit 100 calculates a deviation ΔP between the target water discharge pressure signal Pi output from the operation panel 32 and the detected pressure signal P on the secondary side detected by the pressure sensor 26.
ΔP = Pi−P
And output to the feedback control unit 102.

  The feedback control unit 102 drives the motor 82 of the actuator 24 so as to eliminate the deviation ΔP between the target water discharge pressure Pi and the detected pressure P on the secondary side detected by the pressure sensor 26, and the pressure setting spring of the pressure adjustment valve 22. Feedback control is performed to displace 70 and maintain the set pressure at the target water discharge pressure Pi.

  FIG. 5 is a flowchart showing an example of the case where the feedback control unit 102 is controlled by program control of a computer circuit, and FIG. 6 shows a time chart of motor drive when the deviation changes sinusoidally.

  As shown in FIG. 5, in the control by the feedback control unit 102, when the detected pressure P is lower than the target water discharge pressure Pi, the deviation ΔP becomes positive, and in step S1 (hereinafter “step” is omitted) at time t1 in FIG. As shown, when it is determined that the deviation ΔP is equal to or greater than the predetermined positive threshold value Pth, the process proceeds to S2 to drive the motor 82 of the actuator 24 in the normal direction, push the drive shaft 94, and the pressure of the pressure adjustment valve 22 Control is performed so that the setting spring 70 is displaced in a contracting direction, the spring load is increased, the setting pressure is increased, and the target water discharge pressure Pi is converged. Subsequently, in S3, when the deviation ΔP falls below the threshold value Pth as shown at time t2 in FIG. 6, the process proceeds to S4 and the drive of the motor 82 is stopped.

  On the other hand, when the detected pressure P is higher than the target water discharge pressure Pi, the deviation ΔP becomes negative. In this case, the process proceeds from S1 to S5, and in step S5, as shown at time t3 in FIG. When it is determined that the pressure is equal to or less than -Pth, the process proceeds to S6 to drive the motor 82 in the reverse direction, retract the drive shaft 94 and displace the pressure setting spring 70 of the pressure regulating valve 22 to extend, and reduce the spring load to set pressure. Is controlled so as to converge to the target water discharge pressure Pi. Subsequently, when the deviation ΔP exceeds the threshold value −Pth as shown at time t4 in FIG. 6 in S7, the process proceeds to S4 and the driving of the motor 82 is stopped.

  As a result, the set pressure of the pressure regulating valve 22 is controlled so as to fall within the range of the positive / negative threshold value Pth centered on the target water discharge pressure Pi. In this case, by narrowing the range of the positive / negative threshold value Pth, the set pressure of the pressure regulating valve 22 can be made substantially coincident with the target water discharge pressure Pi.

  As another control, when the deviation ΔP falls within a positive / negative threshold value Pth centered on the target water discharge pressure Pi, the motor 82 is intermittently driven and stopped, and the motor 82 is proportional to the deviation ΔP. By changing the drive period, the set pressure of the pressure regulating valve 22 may be matched with the target water discharge pressure Pi without deviation.

  As another control, the motor 82 is driven and stopped intermittently, and the set pressure of the pressure regulating valve 22 is changed by changing the driving and stopping time of the motor 82 in proportion to or corresponding to the value of the deviation ΔP. Although the pressure is slow to the target water discharge pressure Pi, it enables stable pressure control.

By such control, electrical automatic pressure control is performed in which feedback control is performed so that the set pressure of the pressure adjustment valve 22 matches the target water discharge pressure Pi output from the operation panel 32. As a result, the pressure adjustment valve 22, mechanical automatic pressure regulation control is performed so that the secondary pressure of the release valve 20 matches the target water discharge pressure Pi.
[Water pressure control of water gun]
Next, with reference to FIG. 1 thru | or FIG. 4, the operation | movement until it starts water discharge based on a fire detection, the fluctuation | variation of a pressure generate | occur | produces in water discharge, and also stops water discharge is demonstrated.

  In the steady monitoring state during operation, the fire pump is stopped, and the valve body 80 of the pressure regulating valve 22 and the manual start valve 64 are closed. Closed with force.

  Further, the actuator 24 retracts the drive shaft 94 to an initial position where no load is applied to the pressure setting spring 70 of the pressure regulating valve 22.

  In this state, when a fire occurs in the alert zone and the fire source detector 30 outputs a detection signal to the operation panel 32, the operation panel 32 detects the fire source position by calculation, and the water gun 10 corresponding to the fire source position. The nozzle is directed by swivel scanning, and the corresponding water discharge distances of “far”, “medium” and “near” are selected according to the water discharge distance of the fire source position, and the selected water discharge distance is supported. The output to the control part 28 of the target water discharge pressure signal Pi is prepared.

  Subsequently, when an operator who knows that a fire has occurred by fire notification inserts a key into the key switch 40 of the operation panel 32 and operates the key switch 40 from “localization” to “water discharge”, an activation signal is output to a fire pump (not shown). Thus, the pump operation is started and pressurized water is supplied to the release valve 20. Subsequently, a target water discharge pressure signal Pi corresponding to the water discharge distance is output from the operation panel 32 to the control unit 28. An automatic water discharge function that does not require the operation of the key switch 40 may be installed.

  When the target water discharge pressure signal Pi is input, the adding unit 100 of the control unit 28 outputs a deviation ΔP from the detected pressure signal P detected by the pressure sensor 26, but initially the release valve 20 is closed. The detection pressure P on the secondary side is P = 0, the deviation ΔP is the same as the target water discharge pressure Pi, the feedback control unit 102 drives the motor 82 of the actuator 24 in the normal direction by the motor driving unit 104, and the drive shaft 94. Is pushed to displace the pressure setting spring 70 and the set pressure is increased toward the target water discharge pressure Pi.

  When the spring load of the pressure setting spring 70 provided on the pressure adjusting valve 22 is increased by the actuator 24, the valve portion 80 is opened against the spring 85 by the force of the pressure setting spring 70, and the switching position shown in FIG. The pressurized water on the primary side is supplied from the primary pressure port P1 to the cylinder chamber 58a of the release valve 20 through the cylinder port PL. The piston 56 is stroked upward in the figure against the spring 62, and the valve body 52 is moved to the valve seat. The valve opening is widened away from 54 and pressurized water is supplied to the secondary side to start water discharge from the water discharge gun 10.

  When the open valve 20 is opened by the pressure regulating valve 22 and the pressurized water flows to the secondary side, the secondary pressurized water is supplied to the secondary pressure port P2 and the pilot port PL of the pressure regulating valve 22, respectively. The pilot port PL is a port that applies a secondary pressure to the diaphragm and is an internal port.

  When the secondary side detection pressure P by the pressure sensor 26 increases with the start of water discharge from the water discharge gun 10 due to the opening of the release valve 20, the deviation ΔP from the addition unit 100 of the control unit 28 decreases, and FIG. 5 and FIG. As shown in FIG. 5, when the positive / negative threshold value Pth is entered, the motor drive of the actuator 24 is stopped, and the control pressure is kept at the target discharge pressure Pi.

  While the secondary side pressure of the release valve 20 applied to the pilot port PL of the pressure regulating valve 22 is lower than the target water discharge pressure Pi, the valve body 52 continues to be opened by the piston 56, whereby the secondary side pressure of the release valve 20 is increased. It rises toward the target water discharge pressure Pi. When the secondary pressure of the release valve 20 becomes higher than the target water discharge pressure Pi, the pressure regulating valve 22 is switched from the position shown in FIG. 3A to the position shown in FIG. 3B.

  When the pressure regulating valve 22 is switched to the position shown in FIG. 3B, the primary pressure port P1 is disconnected from the cylinder port CL, and the cylinder port CL communicates with the secondary pressure port P2. For this reason, the pressurized water that has been the primary side pressure of the cylinder chamber 58a flows to the secondary side due to the differential pressure from the lower secondary side pressure of the release valve 20 at that time, and thereby the pressure in the cylinder chamber 58a. Decreases.

  When the pressure in the cylinder chamber 58a decreases, the piston 56 strokes downward in the figure to receive the force of the spring 62 and closes the valve body 52, and the opening of the valve body 52 decreases, so that the secondary side pressure becomes the target water discharge pressure. Lowered towards Pi.

  If the flow rate or pressure from the fire extinguishing pump fluctuates for some reason during water discharge with the target water discharge pressure Pi from the water discharge gun 10, the secondary pressure applied to the pressure adjustment valve 22 also fluctuates. The pressure adjustment valve 22 controls the valve opening degree of the release valve 20 so as to cancel the fluctuation, the secondary pressure is maintained at the target water discharge pressure Pi set by the pressure setting spring 70, and the water discharge from the water discharge gun 10 is performed. The pressure is stabilized at the target water discharge pressure Pi, and a water discharge state in which fire-extinguishing water is reliably sprayed in a range including the fire source position is maintained.

  In this case, the change in the secondary pressure of the release valve 20 due to the change in flow rate or pressure is also detected by the pressure sensor 26, and the deviation ΔP obtained by the adding unit 100 of the control unit 28 is changed. However, as shown in FIGS. 5 and 6, if the deviation ΔP is within the range of the positive / negative threshold value Pth with respect to the target discharge pressure Pi, the set pressure of the pressure adjustment valve 22 is changed by driving the motor of the actuator 24. The automatic automatic pressure control is not performed, but the secondary pressure of the release valve 20 is maintained at the target water discharge pressure Pi by the mechanical automatic pressure control of the pressure adjustment valve 22.

  Further, when the deviation ΔP is large and exceeds the range of the positive / negative threshold value Pth with respect to the target discharge pressure Pi, electric automatic pressure regulation control for changing the set pressure of the pressure regulating valve 22 by driving the motor of the actuator 24 is performed. At the same time, control to maintain the secondary side pressure of the release valve 20 at the target water discharge pressure Pi by mechanical automatic pressure control of the pressure regulating valve 22 is performed to detect the secondary side detected pressure P and the target water discharge pressure Pi. The secondary pressure can be maintained at the target water discharge pressure Pi by mechanical automatic pressure control before the automatic pressure control with low response speed is performed.

[Modification of the present invention]
The pressure regulating valve used in the present invention is not limited to the above-described embodiment. The pressure regulating valve of the opening valve is used to keep the secondary pressure of the opening valve at a predetermined set pressure set based on the spring load of the pressure setting spring. If it is a pressure control valve which adjusts a valve opening degree, the pressure control valve of an appropriate structure is included.

  In addition, although the feedback control unit of the above embodiment takes program control by a computer device as an example, the same function may be realized by an analog circuit. For example, the deviation is obtained with an adder, the deviation output from the adder is input to a window comparator with a positive / negative threshold value set, and if the deviation is negative and out of the threshold range, a forward drive signal is output to the actuator motor. When the deviation is positive and out of the threshold range, a reverse drive signal is output to the motor of the actuator, and when the deviation enters the threshold range, the motor drive may be stopped.

The present invention includes appropriate modifications without impairing the object and advantages thereof, and is not limited by the numerical values shown in the above embodiments.

10: Water cannon 20: Open valve 22: Pressure adjustment valve 24: Actuator 26: Pressure sensor 28: Control unit 30: Fire source detector 32: Operation panel 50: Valve body 52: Valve body 51: Valve drive unit 54: Valve Seat 56: Piston 58: Cylinder 58a: Cylinder chamber 64: Manual start valve 66: Automatic drain valve 70: Pressure setting spring 72: Diaphragm 80: Valve portion 82: Motor 84: Gear train 86: Screw shaft 88: Slider 94: Drive Axis 100: Adder 102: Feedback controller 104: Motor driver

Claims (3)

An opening provided 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,
A pressure adjusting valve that adjusts a valve opening of the open valve so as to maintain a secondary pressure of the open valve at a predetermined set pressure set based on a spring load of a pressure setting spring;
An actuator for changing the set pressure of the pressure regulating valve by changing the spring load by the displacement of the pressure setting spring;
A pressure detector for detecting a secondary side pressure of the release valve;
A control unit configured to control the actuator so as to keep the secondary pressure detected by the pressure detector at a predetermined target pressure and set the target pressure in the pressure regulating valve;
A water discharge pressure control device comprising:
The water discharge pressure control device according to claim 1, wherein the control unit feedback-controls the actuator so as to eliminate a deviation between the target pressure and a secondary pressure detected by the pressure detector. Water discharge pressure control device.
The water discharge pressure control device according to claim 1,
The actuator displaces a pressure setting spring of the pressure adjusting valve by driving a motor,
The water discharge pressure control device, wherein the control unit feedback-controls the motor of the actuator so as to eliminate a deviation between the target pressure and the secondary pressure detected by the pressure detector.

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