JP2019062961A - Water flow detector - Google Patents

Abstract

To accurately determine a flowing water amount by the actuation of a sprinkler head to output a fire alarm, and to accurately determine and monitor inner states such as water leakage and opening/closing of a valve body.SOLUTION: A water flow detector 10 is provided with an opening sensor for detecting the opening of a valve body 26 that opens/closes according to the flowing water in a device body 12, a primary side pressure sensor 48 and a secondary side pressure sensor 50 for detecting a primary side pressure P1 and a secondary side pressure P2 of the valve body 26, and a control part for obtaining a flowing water amount Q flowing from a primary side to a secondary side based on a volumetric coefficient (Cv value) corresponding to the valve opening detected by the opening sensor and the differential pressure, and outputting a water flow detection signal (fire alarm signal) if the water flow amount is a predetermined actuation flow amount or more, which is larger than a predetermined non-actuation flow amount.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water flow detection device provided 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.

  FIG. 12 is an explanatory view showing a conventional water flow detection device, and FIG. 12 (A) shows a monitored state, and FIG. 12 (B) shows an operation state.

  As shown in FIG. 12A, the water flow detection device 100 is in a closed state in which the valve body 102 is in contact with the valve seat 104, and the secondary side pressure P2 is normally the same as the primary side pressure P1 or lower than P1. The closing pressure of the

  When the sprinkler head operates due to a fire or the like, as shown in FIG. 12B, flowing water exceeding a certain amount is generated in the secondary side piping, and the valve body 102 of the flowing water detection device 100 is opened. When the extinguishing water flows into the pressure switch 110 from the inlet 106 provided at 104 and the amount of supply from the inlet 106 exceeds the amount of drainage by the auto drip 112, the pressure of the extinguishing water applied to the pressure switch 110 increases. Turn on and output a running water detection signal to the control panel to output a fire alarm.

  In addition, if the secondary pressure drops below a set pressure relative to the shutoff pressure due to water leakage on the secondary piping side in the normal monitoring state, the valve body 102 is opened and water on the primary side flows into the secondary side. The pressure on the primary side is reduced, and this pressure drop is detected to operate the auxiliary pressure pump, and the pressure on the primary side and the pressure on the secondary side reduced due to water leakage are restored to a predetermined cutoff pressure. When the auxiliary pressure pump is operated under such a condition, the water flow detection device 100 temporarily opens the valve body 102, but the pressure applied to the pressure switch 110 by the drainage by the auto drip 112 does not increase, and the pressure The switch 110 is not turned on and the water flow detection signal is not output.

  Also, in addition to the auto drip 112, a mechanical delay timer is added to the pressure switch 110 to prevent occurrence of false alarm, in order to prevent the fire alarm from being output by the operation of the auxiliary pressure pump that recovers the secondary pressure. Even if a non-operational flow rate is set and constant flow water is generated in the flow water detection device, the valve body is not opened.

JP, 2011-024793, A Japanese Patent Application Laid-Open No. 11-128388 JP, 2006-345883, A

  However, in such a conventional water flow detection device, the setting time of the appropriate delay timer and the non-operational flow rate necessary for not giving a non-fire alarm are the condition of air accumulation in the piping, the auxiliary pressure pump There is a problem that it is not always a perfect measure to prevent false alarms because it changes depending on the performance etc.

  Also, in summer, the pressure on the secondary side piping of the water flow detection device rises sharply, and there are cases where the piping and valve body are destroyed. As a countermeasure, a safety valve is additionally installed, and the pressure on the secondary side piping In the case of a sudden increase, the safety valve is opened and the secondary side piping is drained.

  However, the amount of drainage when the safety valve is activated must trigger the false alarm unless it is less than the inoperative flow rate of the water flow detection device, so it is necessary to squeeze the amount of drainage to a level that reduces the pressure gently. There is a problem that the rise can not be resolved promptly.

  In addition, the water flow detection device detects that the valve body is opened due to the generation of water flow by the pressure increase applied to the pressure switch and outputs the water flow detection signal, and the valve body opens when the pressure switch is turned on. If there is a physical phenomenon that the valve body is opened by flowing water, it is considered as a fire and the flowing water detection signal is output while it is not possible to monitor the correct state of the valve body in the normal situation There is a problem that simple judgment is made and non-fire alarm or false alarm is issued due to factors other than fire, for example, emergency broadcast is activated, causing confusion in people in the building.

  On the other hand, the closing of the valve body of the water flow detection device is determined by the fact that the pressure drops below a predetermined set value and the pressure switch is turned off. That is, even if the valve body is not completely closed, even if water leakage to such an extent that there is no pressure rise is generated, the valve body is not completely closed due to the on / off hysteresis of the pressure switch. Is considered to be closed, for example, it is judged that it has recovered even if it does not lead to a completely closed normal return due to, for example, dust biting, etc. Furthermore, the biting of dust, scratch of rubber valve seat sheet It was very difficult to identify the leak of water due to the occurrence of water and the deterioration of the function of the valve due to the corrosion of the valve body etc.

  In addition, when the pressure inside the piping on the secondary side is gradually reduced due to water leakage, such a situation where the pressure decreases gradually in a timely manner can not be monitored, so it is not known even if water leakage occurs There are still many problems to be solved as a water flow detection device.

  The present invention provides a water flow detection device that can accurately determine and monitor internal conditions such as water leakage and opening / closing of a valve body, as well as output a fire alarm by accurately determining the amount of water flow due to the operation of a sprinkler head. The purpose is

(Water flow detection device)
The present invention relates to a water flow detection device that detects water flow due to the operation of a sprinkler head and outputs a water flow detection signal.
An opening degree sensor that detects the opening degree of a valve body that opens and closes according to flowing water;
A pressure sensor comprising a primary side pressure sensor for detecting the primary side pressure of the valve body and a secondary side pressure sensor for detecting the secondary side pressure of the valve body;
Based on the differential pressure between the primary side pressure and the secondary side pressure and the volume coefficient (Cv value) corresponding to the valve opening degree, the amount of water flowing from the primary side to the secondary side is determined A control unit that outputs a water flow detection signal when the flow rate is higher than
Is provided.

(Water leakage monitoring)
The control unit determines and reports water leakage from temporal changes in primary pressure and secondary pressure detected by the pressure sensor.

(Rotary valve body opening sensor)
The valve body is rotatably supported by the valve shaft,
The opening degree sensor is a rotation angle sensor that detects a rotation angle of a valve shaft, a rotation sensor that detects a rotation amount of the valve shaft, or an encoder that outputs a pulse signal according to the rotation of the valve shaft.

(Pressure sensor to detect differential pressure)
The pressure sensor introduces the primary side pressure and the secondary side pressure, and outputs a differential pressure detection signal according to the differential pressure between the primary side pressure and the secondary side pressure.

(MEMS sensor)
The opening degree sensor and the pressure sensor have a MEMS structure.

(Water flow detection device equipped with contact sensor)
According to another aspect of the present invention, there is provided a water flow detection device that detects water flow due to the operation of a sprinkler head and outputs a water flow detection signal.
The seat provided on the valve body or seat that opens and closes according to the flowing water is provided with a contact sensor for detecting the load applied when the valve body is seated on the valve seat,
A control unit is provided which determines closing and opening of the valve body and an abnormality of the valve body based on the pressure load detected by the contact sensor and outputting the abnormality.

(Contact sensor of valve seat)
Contact sensors are provided at multiple locations on the seat,
The control unit is
When all the detected loads by the plurality of contact sensors are less than a predetermined opening threshold, it is determined that the valve is open,
If all detected loads by the plurality of contact sensors are equal to or greater than a predetermined closing threshold and within a predetermined load range, it is determined that the valve body is closed.
When all detected loads by the plurality of contact sensors are equal to or greater than a predetermined closing threshold and part of the detected loads exceeds the load range, it is determined that the valve body is caught in dust, scratched or deteriorated.

(Load resistance sensor)
The contact sensor changes its resistance value according to the pressure load of the valve body.

(Drainage control valve and secondary pressure error)
Furthermore, a drainage control valve is provided to drain the secondary side of the valve body,
When the secondary pressure detected by the pressure sensor exceeds a predetermined upper limit pressure threshold, the control unit opens the drainage control valve to lower the secondary pressure by drainage on the secondary side.

(Automatic inspection)
When the control unit receives a predetermined inspection instruction, it opens the drainage control valve and makes the valve body open by drainage from the secondary side, and the detection opening degree of the opening degree sensor, the primary side pressure sensor, and the secondary side The detected pressure of each pressure sensor is measured, and the amount of flowing water is calculated by the control unit, and when an abnormality is determined from the measurement result and the calculation result, an inspection abnormality is notified.

(Prohibition of output of water flow detection signal by opening drain valve)
When the drainage control valve is opened, the control unit prevents the water flow detection signal from being output even if the water flow rate becomes equal to or more than the operation flow rate.

(Recovery monitoring of water flow detection device)
When closing the drainage control valve and stopping drainage from the secondary side, the control unit detects the primary side pressure and secondary side detected by the pressure sensor at a predetermined full closing degree when the detection degree of the opening sensor is stopped. When the pressures become substantially the same, the normal recovery is determined, and in the other cases, the recovery abnormality is determined and notified.

(Movement monitoring of valve body)
When the drainage control valve is opened or closed, the control unit determines and notifies the appropriateness of the movement of the valve body from the temporal change of the opening degree of the valve body detected by the opening degree sensor.

(Fire monitoring when the drainage control valve is opened)
The drainage control valve is provided with a drainage opening sensor for detecting the drainage opening and a drainage pressure sensor for detecting the differential pressure between the primary side pressure and the secondary side pressure,
The control valve determines the amount of drainage water based on the differential pressure detected by the drainage pressure sensor when the drainage control valve is opened and the volume coefficient (Cv value) corresponding to the detection opening degree of the drainage opening degree sensor. If the flow rate by opening is the same as the drainage flow rate of the drainage control valve, the flow detection signal is not output and the flow rate by opening the valve body adds a predetermined sprinkler head working flow rate to the predetermined drainage flow rate by opening the drainage control valve If the flow rate is equal to or higher than the predetermined flow rate, a flow detection signal is output.

(Management of major components)
The control unit stores and manages management information of predetermined main constituent devices including the valve body, the opening degree sensor, and the pressure sensor in advance.

(Control of replacement time of major components)
The control unit manages the replacement time of the main component devices and notifies that the replacement time is approaching.

(Configuration of control unit)
The control unit is constituted by a computer circuit including a CPU, a memory, an input / output port, a display unit, and an operation unit, and the function of the control unit is realized by execution of a predetermined program by the CPU.

(Transmission to the upper device by the communication unit)
The control unit further includes a communication unit, and the communication unit transmits the detected opening of the opening sensor, the detected pressure of the pressure sensor, the flowing water amount calculated by the control unit, and the flowing water detection signal to an external host device outside Let it be processed.

(Fault tolerant by contact sensor)
The seat provided on the valve body or seat that opens and closes according to the flowing water is provided with a contact sensor for detecting the load applied when the valve body is seated on the valve seat,
When the opening degree sensor or the pressure sensor is broken, the control unit determines that the contact sensor opens the valve body at a predetermined opening degree or more, and outputs a water flow detection signal.

(Fault tolerant by temperature sensor)
Furthermore, a temperature sensor is provided to detect the temperature of the extinguishing water filled in the piping,
When the opening degree sensor, the pressure sensor, and the contact sensor fail, the control unit determines the flowing water from the predetermined change of the temperature detected by the temperature sensor and outputs a flowing water detection signal.

(Fire judgment by combination of multiple sensors)
According to another aspect of the present invention, there is provided a water flow detection device that detects water flow due to the operation of a sprinkler head and outputs a water flow detection signal.
An opening degree sensor that detects the opening degree of a valve body that opens and closes according to flowing water;
A pressure sensor that detects a differential pressure between the primary side pressure and the secondary side pressure of the valve body;
A contact sensor that detects a load applied when the valve body is seated on the valve seat;
A fire is judged when at least two detection conditions of the opening detection of the valve body by the opening sensor, the predetermined differential pressure detection by the pressure sensor, or the drop detection of the load by the contact sensor are satisfied and the water flow detection signal is A control unit that outputs
Is provided.

(Basic effect)
The present invention is a flowing water detection device that detects flowing water due to the operation of a sprinkler head and outputs a flowing water detection signal, and detects the opening degree of a valve provided openably and closably in accordance with flowing water in the device body. The difference between the pressure sensor and the pressure on the primary side and the pressure on the secondary side of a pressure sensor comprising a pressure sensor on the primary side that detects the pressure on the primary side of the valve body and a pressure on the secondary side of the valve body Based on the pressure and the capacity coefficient (Cv value) corresponding to the valve opening degree, the amount of flowing water flowing from the primary side to the secondary side is determined, and the flowing water detection signal is Since the control unit to output is provided, the valve body of the water flow detection device is largely opened by the flowing water when the sprinkler head operates and the fire extinguishing water is discharged at the time of fire occurrence, and the opening degree of the valve body Detected and controlled The differential pressure is obtained from the primary side pressure and secondary side repulsion detected by the pressure sensor, and the capacity coefficient corresponding to the detected valve opening degree is calculated from the memory, so that the flowing water is based on the differential pressure and the capacity coefficient. Since the amount is calculated and the flow amount is known regardless of the valve opening degree, the flow detection signal can be accurately output to perform a fire alarm when the flow rate is equal to or more than a predetermined operation flow rate.

  In addition, when the primary pressure of the water flow detection device gradually decreases in the monitoring state and the auxiliary pressurization pump starts operation, the water flow detection device may be temporarily opened, but also in this case The amount of water flow is similarly determined based on the corresponding volume coefficient and differential pressure, and since the amount of water flow at this time does not exceed the predetermined working flow rate at the time of fire occurrence, the flow water flowing temporarily in the operation of the auxiliary pressure pump The quantity does not erroneously output the water flow detection signal, and high reliability can be obtained.

  Furthermore, as in the conventional water flow detection device, there is no need for a pressure switch with a mechanical delay timer or a mechanical structure for mechanically setting the inoperative flow rate, and the structure of the water flow detection device can be simplified. it can.

(Effect of water leakage monitoring)
In addition, since the control unit determines and reports water leakage from temporal changes in primary pressure and secondary pressure detected by the pressure sensor, the control unit is generated before the auxiliary pressure pump is operated. The leakage pressure changes gradually as the pressure on the primary side is constant and the pressure on the secondary side gradually decreases with the passage of time, or the pressure on the primary side and the pressure on the secondary side are gradually reduced with time. From the gradual change, it can be informed that the water leakage that is the operation factor of the auxiliary pressure pump is occurring, and by knowing the sign of the occurrence of abnormality in the piping, the reliability of the maintenance of the facility is improved.

(Effect of opening sensor)
Further, the valve body is rotatably supported by the valve shaft, and the opening degree sensor is a rotation angle sensor for detecting a rotation angle of the valve shaft, a rotation sensor for detecting a rotation amount of the valve shaft, or rotation of the valve shaft Is an encoder that outputs a pulse signal according to the angle of rotation, the amount of rotation, or the number of pulses, for example, to obtain an opening degree by percentage display, and from the correspondence table of the opening degree and capacity coefficient stored in advance in the memory of the control unit The volume coefficient corresponding to the detected opening can be read out to calculate the amount of water flow.

(Effect of pressure sensor to detect differential pressure)
In addition, the pressure sensor introduces a primary pressure and a secondary pressure, and outputs a differential pressure detection signal according to the primary pressure, secondary pressure and differential pressure, so it corresponds to the opening degree. The differential pressure necessary for determining the amount of water flow from the volume coefficient can be easily detected.

(Effect of MEMS sensor)
In addition, since the opening sensor and pressure sensor have a MEMS (Micro Electro Mechanical System) structure, the flow sensor is provided with an opening sensor and a pressure sensor because it is an ultra-small sensor integrated by microfabrication technology. Can be the same as or smaller than the conventional one.

(Effect of water flow detection device with contact sensor)
Further, in another embodiment of the present invention, in a water flow detection device that detects water flow by operation of the sprinkler head and outputs a water flow detection signal, the valve body or valve seat that opens and closes according to the water flow is provided. Contact sheet for detecting the load applied when the valve body is seated on the valve seat, and based on the pressure load detected by the contact sensor, closing and opening of the valve body, and abnormality of the valve body A control unit is provided to determine and output, for example, contact sensors are provided at a plurality of locations of the seat, and the control unit is a valve body when all of the detection loads by the plurality of contact sensors are less than a predetermined release threshold Is determined to be open, and when all detected loads by a plurality of contact sensors are equal to or greater than a predetermined closing threshold and equal to a predetermined load range, the valve body is determined to be closed, and all detected loads by a plurality of contact sensors Is the predetermined closing threshold If part of the detected load exceeds the load range, it is determined that the valve body is caught in a bite, scratched or deteriorated, and furthermore, the contact sensor changes its resistance value according to the contact load of the valve body. Since the seat provided on the valve seat or the valve body is provided with a plurality of contact sensors, the valve body is completely closed if the detected load above the predetermined closing load by the plurality of contact sensors is uniform. On the other hand, if it is less than the predetermined opening load, it is known that the valve body is open, and it is possible to accurately know the open / close state of the valve body and to increase the reliability of maintenance and management of the facility.

  In addition, after the water flow detection device is opened due to a fire or inspection, if the valve body is restored due to fire check or inspection completion, if the detected load by multiple contact sensors provided on the sheet is uneven, the detected load It becomes possible to know abnormalities such as dust biting, scratches or deterioration in the part of the valve seat that becomes the detection range of the contact sensor where the abnormality is abnormal, failure, failure prediction, preventive maintenance (replacement etc before failure) Maintenance) can be identified without disassembling the valve, the need for inspection and maintenance, and the determination of a failure can be made, and the reliability of maintenance and management of equipment can be increased.

(Effect on drainage control valve and secondary pressure abnormality)
Furthermore, a drainage control valve for draining the secondary side of the valve body is provided, and the control unit opens the drainage control valve when the secondary pressure detected by the pressure sensor exceeds a predetermined upper limit pressure threshold. Since the secondary side pressure is reduced by the secondary side drainage, it is possible to correctly determine the abnormality of the secondary side pressure that occurs in summer etc. Furthermore, the drainage control valve attached to the water flow detection device is opened. By doing this, it is possible to automatically lower the secondary pressure that has become abnormal, reduce the stress applied to piping connection devices such as piping and sprinkler heads, and suppress the failure occurrence of the equipment and improve the durability. .

(Effect of automatic inspection)
Further, when the control unit receives a predetermined inspection instruction, the control unit opens the drainage control valve and causes the drainage from the secondary side to open the valve body, thereby detecting the opening degree of the opening sensor, the primary pressure sensor, Since each detection pressure of the next side pressure sensor is measured, and the amount of water flow is calculated by the control unit, and an abnormality in the inspection is determined when the abnormality is determined from the measurement result and the calculation result, the automatic as the conventional equipment as a whole In addition to inspections, automatic inspection of a single water flow detection device or automatic inspection performed simultaneously in multiple systems becomes possible.

(Effect of output prohibition of water flow detection signal by opening drainage control valve)
In addition, when the drainage control valve is opened, the control unit does not output the flowing water detection signal even if the flow rate becomes equal to or higher than the operation flow rate. Therefore, the drainage control valve is opened for automatic inspection. Even if the amount of drainage equivalent to the amount of working water is supplied to the water detection device, the controller does not output the water detection signal to the control panel or the like because it is the amount of water generated by opening the drainage control valve. A fire alarm can be reliably prevented from being output by the operation of the water flow detection device.

(Effect of recovery monitoring of water flow detection device)
In addition, when the drainage control valve is closed and drainage from the secondary side is stopped, the control unit detects the opening degree of the opening sensor at the predetermined full closing degree and the primary side pressure detected by the pressure sensor. Normal recovery is judged when the pressure on the next side becomes almost the same, and a recovery abnormality is judged and reported otherwise, so whether or not the water flow detection device recovered normally with the end of the inspection It is possible to take appropriate measures and preventative maintenance by promoting the promotion and recommendation of precision inspection etc. when it becomes clear and recovery abnormalities occur.

(Effect of monitoring movement of valve body)
In addition, when the drainage control valve is opened or closed, the control unit determines and notifies the appropriateness of the movement of the valve body from the temporal change of the opening degree of the valve body detected by the opening degree sensor. For example, measure the opening time until the valve body opens to a certain opening at the time of inspection, and measure the closing time until the valve body completely closes at the end of the inspection, and it takes time to open and / or close If it is, it is understood that the movement of the valve body is aggravated, and by knowing the sign of internal abnormality such as rust, promotion of precision inspection, promotion of recommendation etc., appropriate measures can be made possible and preventive maintenance Can be

(Effect of fire monitoring when the drainage control valve is opened)
The drainage control valve is provided with a drainage opening sensor for detecting the drainage opening and a drainage pressure sensor for detecting the differential pressure between the primary side pressure and the secondary side pressure, and the control valve opens the drainage control valve If the drainage pressure is determined based on the differential pressure detected by the drainage pressure sensor and the capacity coefficient (Cv value) corresponding to the detected opening of the drainage opening sensor, the amount of water flowed by opening the valve is the drainage of the drainage control valve If the flow rate is the same as the flow rate, the flow rate detection signal is not output, and if the flow rate by opening the valve is more than the predetermined flow rate obtained by adding the predetermined sprinkler head working flow rate to the predetermined drainage flow rate by opening the drainage control valve Since the signal is output, the drainage control valve opened at the time of inspection also knows the amount of water flow by calculation based on the volume coefficient corresponding to the full opening degree and the differential pressure, so the water flow amount of the water flow detection device during inspection Is the drainage control valve If the water volume is greatly exceeded, it can be judged that the sprinkler head is operating due to a fire, and in this case the water flow detection signal is output even during the inspection, and the sprinkler head operates when the fire occurs during the inspection Even in case of fire, a fire alarm can be output with certainty.

(Effect of management of major components)
In addition, the control unit prestores and manages management information of predetermined main components including the valve body, the opening degree sensor, and the pressure sensor. For example, the control unit manages replacement time of the main components and replaces it. Since the notification was made that the time was approaching, the inspection qualified person knows that the time to replace the main component of the water flow detection device is approaching during operation of the facility, for example, a valve seat seat etc. Knowing when to replace, make work plans and schedules, and make it possible to properly perform the work necessary for preventive maintenance.

(Effect by configuration of control unit)
Further, the control unit is constituted by a computer circuit including a CPU, a memory, an input / output port, a display unit and an operation unit, and the function of the control unit is realized by execution of a predetermined program by the CPU. In contrast to the conventional water flow detection device that could only make a fairly vague fire judgment by having a control function realized by the execution of the program by the CPU, the output function of the water flow detection signal based on the calculation of water flow and the automatic inspection function And so on can be realized.

(Effect by transmission to higher-level device by communication unit)
Further, the control unit further includes a communication unit, and the communication unit transmits the detected opening of the opening sensor, the detected pressure of the pressure sensor, the flowing water amount calculated by the control unit, and the flowing water detection signal to the external host device By connecting to a remote monitoring panel etc. of the disaster prevention center by radio or cable, in order to obtain information such as abnormal rise in piping pressure in summer, it is always at a distance without going near the equipment It is possible to construct a system capable of status monitoring, abnormality monitoring, inspection instruction, etc., and provide a system creation meeting customer needs.

(Effect of fault tolerance by contact sensor)
Further, a contact sensor for detecting a load applied when the valve body is seated on the valve seat is provided on a valve body or a seat provided on the valve seat that opens and closes according to flowing water, and the control unit is an opening degree sensor or If the pressure sensor breaks down, the contact sensor determines that the valve body is open and outputs the flowing water detection signal. Therefore, even if the opening sensor or the pressure sensor breaks down and the flow rate can not be calculated, the contact is made. By outputting the water flow detection signal by detecting the opening of the valve body by the sensor, it is possible to make a judgment by another sensor even when a part of the sensor fails, and realize the fault tolerance to the sensor failure to improve the reliability. Can.

(Effect of fault tolerant by temperature sensor)
Furthermore, a temperature sensor for detecting the temperature of the extinguishing water filled in the pipe is provided, and the control unit detects a change in the temperature detected by the temperature sensor when the opening sensor, the pressure sensor and the contact sensor fail. Therefore, even if the opening sensor, pressure sensor, and contact sensor fail, the water flow due to the operation of the sprinkler head is determined from the temperature drop of the extinguishing water of the temperature sensor, and the water flow is detected. A fire alarm can be performed by the output of the detection signal, and a fault tolerance can be realized for failure of the opening degree sensor, the pressure sensor, and the contact sensor to further enhance the reliability.

(Effect of fire judgment by combination of multiple sensors)
Further, in another aspect of the present invention, in a flowing water detection device that detects flowing water by the operation of the sprinkler head and outputs a flowing water detection signal, the opening degree of a valve that opens and closes according to flowing water is detected. An opening sensor, a pressure sensor that detects the differential pressure between the primary side pressure and the secondary side pressure of the valve body, a contact sensor that detects a load applied when the valve body is seated on the valve seat, and an opening degree sensor A control unit that determines a fire and outputs a running water detection signal when at least two detection conditions of opening detection of a valve body, predetermined differential pressure detection by a pressure sensor, or detection of a drop in load by a contact sensor are satisfied. Therefore, for example, when the detection condition by all the sensors is satisfied, it is possible to improve the reliability of the fire judgment by judging as a fire, and a fire is generated by a combination of the detection conditions by two sensors. When the constant is, it is possible to fail-safe by determining fire by the remaining sensors even if any of the three sensors has failed.

Explanatory drawing which showed embodiment of the water flow detection apparatus in a normal monitoring state Explanatory drawing which showed the cross section of the water flow detection apparatus of FIG. 1 Explanatory drawing which took out and showed the contact sensor provided in the valve seat of the fluid detection apparatus Explanatory drawing which showed other embodiment which provided the contact sensor in the valve body side. Block diagram showing the functional configuration of the control unit provided in the water flow detection device Flow chart showing water flow detection control by control unit of water flow detection device Flow chart showing details of fire monitoring control in step S1 of FIG. 6 Flow chart showing details of water leakage monitoring control in step S2 of FIG. 6 Flow chart showing details of secondary pressure abnormality monitoring control in step S3 of FIG. 6 A flowchart showing the details of the inspection control in step S4 of FIG. 6 Flow chart showing details of fire monitoring control during inspection An explanatory view showing a conventional water flow detection device

[Structure of water flow detection device]
FIG. 1 is an explanatory view showing an embodiment of a water flow detection device in a normal monitoring state, and FIG. 2 is an explanatory view showing a cross section of the water flow detection device of FIG.

(Basic structure)
As shown in FIGS. 1 and 2, in the flush water detection device 10 of the present embodiment, the inlet 14 is formed on the lower side of the device body 12, the primary piping 18 is connected, and the outlet 16 is formed on the upper side. The secondary side piping 20 is connected, and the closed type sprinkler head 22 installed in the protected area is connected to the secondary side piping 20.

  A valve body 26 is accommodated inside the device body 12 so as to be openable and closable by a valve shaft 24. The valve body 26 is pivoted to the illustrated closed position by its own weight, and is pressed by the rubber valve seat 30 disposed on the annular valve seat 28 to close the flow path.

  A drainage port 32 is formed on the side surface on the secondary side of the apparatus body 12 and a drainage pipe 34 is connected, and a drainage control valve 36 using an electric valve is provided in the middle of the drainage pipe 34.

  A display unit 60 and an operation unit 62 are provided on the end face of the case cover 38 in which the control unit 40 is housed. The display unit 60 is, for example, a color liquid crystal display, on which various types of information necessary for control, inspection, maintenance and the like of the water flow detection device 10 are displayed. The operation unit 62 is provided with various switches necessary for flow detection control, such as a power switch, an inspection switch, and a recovery switch.

  When the sprinkler head 22 is activated and a fire extinguishing water is released due to a fire, the water flow detection device 10 starts an operation of an auxiliary pressure pump (not shown) provided in a piping system on the primary side piping 18 side to extinguish the water. The pressure in the piping decreases rapidly due to the large amount of water discharged from the sprinkler head 22, but the pressure switch of the air tank branch-connected to the water main detects the pressure drop and starts the extinguishing pump. This will continue to provide fire fighting water.

  The discharge of the fire extinguishing water by the operation of the sprinkler head 22 flows through the water flow detection device 10 and the fire extinguishing water flows, and it is pushed by the flowing water of the fire extinguishing water, and the valve body 26 opens like a valve body 26a shown by an imaginary line.

  When the fire is extinguished, the water discharge from the operated sprinkler head 22 can be stopped by closing the gate valve 17 provided on the primary side pipe 18.

  Further, in the case of normal monitoring, for example, when there is water leakage in the secondary side pipe 20, the pressure of the primary side pipe is also linked and the pressure is reduced, so an auxiliary addition (not shown) provided in the piping system on the primary pipe 18 side The pressure pump is operated temporarily to supply the extinguishing water, so that the valve body 26 of the flowing water detection device 10 opens slightly to compensate for the pressure drop in the secondary pipe 20 due to the water leakage.

{Sensor and control unit of water flow detection device}
The water flow detection device 10 according to the present embodiment accurately determines the amount of water flow due to the operation of the sprinkler head to output a fire alarm, and at the same time the non-fire report due to the inoperative flow rate accompanying the operation of the auxiliary pressure pump is reliably prevented Furthermore, various sensors and control units are provided to accurately determine and monitor internal conditions such as water leakage and opening and closing of the valve body.

(Opening sensor)
As shown in FIG. 2, an opening degree sensor 46 is provided for the valve shaft 24 which rotates integrally with the valve body 26. The valve shaft 24 is rotatably inserted into the apparatus body 12 through the shaft hole of the valve body 26 and closed at the front end by the screwing of the plug 25 and at the rear end by the screwing of the sensor plug 47 An opening sensor 46 is disposed in the inside.

  A box-shaped case cover 38 is attached to one side of the apparatus main body 12, and a control unit 40 is housed inside.

  A signal line from the opening degree sensor 46 is drawn out through the sensor plug 47 and connected to the control unit 40 by a sensor connector 54 provided on the case cover 38.

  The opening degree sensor 46 detects the opening degree of the valve body 26 that opens and closes according to the flowing water flowing through the device body 12, and outputs an opening degree detection signal to the control unit 40. As the opening degree sensor 46, a rotation angle sensor that detects the rotation angle of the valve shaft 24, a rotation sensor that detects the rotation amount of the valve shaft 24, or an encoder that outputs a pulse signal according to the rotation of the valve shaft 24 It can be used.

  In addition, as a rotation angle sensor, a rotation sensor, or an encoder used as the opening degree sensor 46, the microminiature sensor integrated by the microfabrication technology is formed as a MEMS structure, as shown in FIG. It can be embedded in the partition wall.

  The opening degree of the valve body 26 detected by the opening degree sensor 46 is the capacity of the valve body 26 for calculating the flow amount Q of the flowing water at the opening of the valve body 26 in the control unit 40, as will be clarified in the later description. It is used to read out the coefficient Cv from the memory.

(Pressure sensor)
As shown in FIG. 1, a primary side pressure sensor 48 is provided on the primary side partition of the device body 12, and a secondary side pressure sensor 50 is provided on the secondary side partition.

  The secondary side pressure sensor 50 is incorporated in the partition wall on the secondary side of the apparatus body 12 and has a pressure introducing port opened inside, and the outside is closed by screwing in the sensor plug 51, and from the secondary side pressure sensor 50 The signal line is drawn to the outside through the sensor plug 51 and connected to the control unit 40 by a sensor connector 56 provided on the case cover 38. The primary side pressure sensor 48 also has the same built-in structure as the secondary side pressure sensor 50, and is connected to the control unit 40 by a sensor connector.

The primary side pressure sensor 48 detects the primary side pressure P1, the secondary side pressure sensor 50 detects the secondary side pressure P2, and the control unit 40 controls the flow of water accompanying opening and closing of the valve body 26, as described later. The differential pressure ΔP for calculating Q is ΔP = P2-P1
As you are seeking.

  Therefore, the differential pressure calculation by the primary side pressure sensor 48, the secondary side pressure sensor 50 and the control unit 40 substantially realizes a function as a differential pressure sensor.

  In place of the function of the differential pressure sensor by differential pressure calculation by the primary side pressure sensor 48, the secondary side pressure sensor 50, and the control unit 40, a differential pressure sensor may be provided in the apparatus main body. The differential pressure sensor introduces the primary side pressure P1 and also the secondary side pressure P2, and generates a differential pressure detection signal corresponding to the primary side pressure P1, the secondary side pressure P2, and the differential pressure ΔP (= P2-P1). Configure to output.

In addition, the primary side pressure sensor 48 and the secondary side pressure sensor 50 used for differential pressure detection have a MEMS structure, thereby forming a microminiature sensor integrated by the microfabrication technology, as shown in the figure, the device main body 12 Embedded in the bulkhead of the
This point is the same as in the case of using a differential pressure sensor.

  In the present embodiment, since water leakage is determined from the time change of the primary pressure P1 and the secondary pressure P2, the primary pressure sensor 48 and the secondary pressure sensor 50 are not used as a differential pressure sensor. It is desirable to provide them individually.

(Contact sensor)
As shown in FIG. 1, a contact sensor 64 is provided on the valve seat 30 of the valve seat 28 where the valve body 26 is pressed in the closed state. The contact sensor 64 detects the pressing load of the valve body 26 applied to the rubber valve seat 30, and outputs the pressure load to the control unit 40.

  The control unit 40 determines the opening and closing of the valve body 26 from the detected load of the contact sensor 64, and determines an abnormality such as dust biting, damage or deterioration of the valve seat 30 from the distribution of the detected load.

  FIG. 3 is an explanatory view showing the contact sensor provided on the valve seat of the fluid detection device, showing a plane in FIG. 3 (A) and an XX cross section of the sensor body in FIG. 3 (B) .

  As shown in FIG. 3A, the contact sensor 64 has sixteen sensor bodies 66 arranged at predetermined angle units, for example, 22.5 degrees with respect to a ring-shaped holder 65 using insulating rubber. As shown in FIG. 3B, the sensor body 66 arranges the electrodes 70 and 72 on both sides of the conductive rubber 68 and pulls out the lead wires 74a and 74b, and when a load F is applied to the conductive rubber 68 The resistance value of the conductive rubber between the electrodes 70 and 72 changes. For example, when the load F increases, the resistance value decreases, and when the load F decreases, the resistance value increases, and the load applied to the sensor main body 66 is detected electrically as a change in the resistance value as a change in voltage or current. It can be detected.

  Further, by arranging the plurality of sensor main bodies 66 in a ring shape, positional load detection, that is, load distribution applied to the valve seat 30 can be detected. Note that the resolution of the load distribution may be realized by the number of installed sensor main bodies 66.

  FIG. 4 is an explanatory view showing another embodiment in which the contact sensor is provided on the valve body side. As shown in FIG. 4, the water flow detection device of the present embodiment arranges a ring-shaped valve seat 31 on the pressing surface of the valve body 26 opposed to the valve seat 28, and behind the valve seat 31, FIG. The ring-shaped contact sensor 64 shown in FIG.

  In the present embodiment, since the contact sensor 64 is disposed on the side of the rotating valve body 26, the signal line from the contact sensor 64 forms a wiring pattern on the strip-like flexible printed circuit board to form the valve body 26 and the control unit It is sufficient to connect between 40s.

(Temperature sensor)
As shown in FIG. 1 and FIG. 2, the temperature sensor 52 provided with a temperature detection element such as a thermistor is placed in the partition on the secondary side of the device main body 12 so that the temperature probe is immersed in the secondary fire extinguishing water. The control unit is disposed by protruding outside and closed by screwing in the sensor plug 53 outside the temperature sensor 52, and the signal line from the temperature sensor 52 is drawn out through the sensor plug 53 and by the sensor connector 56 provided on the case cover 38. Connected to 40.

  When flowing water occurs in the flowing water detection device 10, a change in temperature detected by the temperature sensor 52 immersed in the fire extinguishing water decreases, so that the control unit 40 changes the temperature of the valve body 26 from the temperature change accompanying the flowing water. Control which determines open | release and outputs a flowing water detection signal is attained.

  In the present embodiment, as will be described later, the output of the water flow detection signal based on the temperature detected by the temperature sensor 52 is the opening degree sensor 46, the primary pressure sensor 48 or the second side required for calculation of the water flow amount of the water flow detection device 10. It is used for fault tolerance in case the next side pressure sensor 50 breaks down. Therefore, the temperature sensor 52 is not necessarily required.

[Controller unit]
FIG. 5 is a block diagram showing a functional configuration of a control unit provided in the water flow detection device.

  As shown in FIG. 5, the control unit 40 of the water flow detection device includes a control processor 75, and for the bus 84 of the control processor 75, an opening degree sensor 46 and a primary pressure sensor 48 provided in the device body 12; The secondary pressure sensor 50, the contact sensor 64, and the temperature sensor 52 are connected via an AD conversion port (not shown).

  Further, for the bus 84 of the control processor 75, a display unit 60 using a liquid crystal color display, and an operation unit 62 provided with at least an inspection switch and a recovery switch are provided.

  Furthermore, for the bus 84 of the control processor 75, a wireless communication unit 86 having an antenna 88 and a wired communication unit 90 from which the transmission cable 91 is pulled out are provided.

  The wireless communication unit 86 conforms to, for example, STD-30 (specific low power security system wireless station standard) which is known as a standard for a specific low power wireless station in the 426 MHz band, and includes 426.2500 MHz to 426.8375 MHz. And 48 channels having a frequency bandwidth of 12.5 kHz are allocated between the two channels, and transmit and receive signals with the monitoring center using one of the channel frequencies.

  The wired communication unit 90 transmits and receives signals to and from the monitoring center according to, for example, a LAN communication protocol. The wireless communication unit 86 and the wired communication unit 90 may be either one as needed.

(Function of control unit)
The control processor 75 is provided with a CPU 76, and a control logic 78, a ROM 80 and a RAM 82 are connected to a bus 84 from the CPU 76. The control logic 78 implements various hardware functions such as bus control accompanying control processing of the CPU 76. The CPU 76 is provided with the function of the control unit 77 realized by executing a program.

  FIG. 6 is a flowchart showing water flow detection control by the control unit of the water flow detection device. As shown in FIG. 6, the control unit 77 performs fire monitoring control in step S1, water leakage monitoring control in step S2, secondary pressure abnormality monitoring control in step S3, and inspection control in step S4.

[Fire monitoring control]
The control unit 77 provided in the CPU 76 of FIG. 5 performs the following fire monitoring control. The controller 77 controls the opening degree A of the valve body 26 detected by the opening degree sensor 46, the primary side pressure P1 detected by the primary side pressure sensor 48, and the secondary side pressure P2 detected by the secondary side pressure sensor 50. Are periodically read by AD conversion, and the water flow rate Q of the water flow detection device 10 is calculated and determined.

  A capacity coefficient table 85 is stored in advance in the RAM 82 in order to calculate the water flow amount Q by the control unit 77. In the capacity coefficient table 85, a capacity coefficient Cv corresponding to the opening degree A of the valve body 26 is stored.

The volume coefficient Cv of the valve is given by the following equation.
Cv = K · Q · (G / ΔP) ^1/2 (Equation 1)
Q: Flow rate G: Specific gravity (G = 1 for water)
ΔP: Differential pressure K: Constant

  Therefore, at the manufacturing stage, the flow rate Q and the differential pressure ΔP are measured while changing the opening degree A of the valve body 26 in the water flow detection device 10, the capacity coefficient Cv is obtained from (Expression 1), and registered in the capacity coefficient table 85. , This is stored in advance in the RAM 82.

Therefore, the control unit 77 reads out the corresponding capacity coefficient Cv by referring to the capacity coefficient table 85 based on the detected opening degree A of the opening degree sensor 46, and detects the primary side pressure P1 detected by the primary side pressure sensor 48 From the secondary pressure P2 detected by the secondary pressure sensor 50, the differential pressure ΔP is ΔP = P2−P1
The water flow rate Q is calculated by the following equation.
Q = Cv / (K (G / ΔP) ^1/2 ) (Equation 2)

  Subsequently, the control unit 77 compares the water flow rate Q calculated by the calculation with a predetermined threshold flow rate Qth corresponding to the working flow rate of the sprinkler head 22, and determines that a fire occurs when the threshold flow rate Qth or more. Control is performed to output an alarm signal, and a water flow detection signal is transmitted from the wireless communication unit 86 and / or the wired communication unit 90 to a sprinkler control panel, a monitoring center or the like to output a fire alarm.

  FIG. 7 is a flowchart showing the details of the fire monitoring control in step S1 of FIG. 6, which is control by the control unit 77 provided in the CPU 76.

  As shown in FIG. 7, the controller 77 controls the opening degree A of the valve body 26 detected by the opening degree sensor 46 in step S11, the primary side pressure P1 detected by the primary side pressure sensor 48, and the secondary side pressure sensor The secondary pressure P2 detected at 50 is read by AD conversion. The primary side pressure P1 and the secondary side pressure P2 read in step S11 are stored as history information in the RAM 82 for water leakage monitoring control described later.

  Subsequently, the control unit 77 proceeds to step S12, reads the capacitance coefficient Cv corresponding to the opening degree A read in step S11 by referring to the capacitance coefficient table 85 of the RAM 82 and obtains the differential pressure ΔP as ΔP = P2-P1. At step S13, the water flow rate Q is calculated by calculation in accordance with the above (formula 2).

  Subsequently, the control unit 77 proceeds to step S14 and compares the water flow rate Q calculated in step S13 with the threshold flow rate Qth corresponding to the sprinkler operation flow rate, and the sprinkler head operates due to fire and the valve body of the water flow detection device 10 If the H.26 is open, it is determined that the water flow amount Q is equal to or more than the threshold flow rate Qth, and the process proceeds to step S15 to output a water flow detection signal to output a fire alarm from the sprinkler control panel and the monitoring sweater.

  On the other hand, if the auxiliary pressure pump is operated with the decrease of the secondary pressure P2 due to water leakage etc. and the valve body 22 of the water flow detection device 10 is temporarily opened and the inoperative flow rate flows, calculation is made in step S13. The amount of water flow Q is small, does not become equal to or higher than the threshold flow rate Qth in step S14, the water flow detection signal is not output in step S15, and a non-fire notification is issued by temporary operation of the auxiliary pressure pump accompanying water leakage. Can be reliably prevented.

[Water leakage monitoring control]
The control part 77 provided in CPU76 of FIG. 5 performs the next water leak monitoring control. The control unit 77 performs control to determine and report water leakage from temporal changes in the primary pressure P1 detected by the primary pressure sensor 48 and the secondary pressure P2 detected by the secondary pressure sensor 50. .

  For example, when there is leakage of a small amount of water in which the valve body 26 hardly opens in the secondary side pipe 20 of the water flow detection device 10, the opening degree A of the valve body 26 is approximately 0 percent. The calculation can not determine water leakage.

  Therefore, the control unit 77 controls the primary pressure P1 and the secondary pressure P2 for a predetermined time, for example, 24 hours a day, stored as history data in the RAM 82 at predetermined water leakage monitoring timings, for example, once a day. The average value is read out and the average value is calculated, and the primary side average pressure P1a is the same as the primary side average pressure obtained last time, and the secondary side average pressure P2a is lower than the secondary side average pressure obtained last time, and When the reduced pressure is equal to or higher than a predetermined water leakage threshold, it is determined that the water leakage is detected, and a water leakage alarm is displayed on the display unit 60, and a water leakage alarm signal is transmitted to the monitoring center to output a water leakage alarm indicating possibility of water leakage.

  For this reason, it indicates to the monitoring personnel of the monitoring center that there is a possibility of water leakage in the secondary piping system of the water flow detection device that has output the water leakage warning signal, and is aware of the sign of abnormality occurrence in the piping. Necessary inspections will be conducted to improve the reliability of equipment maintenance.

  FIG. 8 is a flowchart showing the details of the water leakage monitoring control in step S2 of FIG. 6, which is control by the control unit 77 provided in the CPU 76.

  As shown in FIG. 8, when the controller 77 determines the water leakage monitoring timing, which is once a day, for example, in step S21, the process proceeds to step S22, and the predetermined time stored in the RAM 82, for example, one hour in the past 24 hours The side pressure P1 and the secondary pressure P2 are read out, and their respective average values P1a and P2a are determined in step S23.

  Subsequently, in step S24, the control unit 77 compares the primary average pressure P1a with the previous primary average pressure, and when it is determined that the both have a change and is not constant, the process proceeds to step S25 and the primary average pressure P1a decreases. If the secondary average pressure P2a is lower than the previous one, the process proceeds to step S27. If P1a = P2a, the process proceeds to step S28.

  When the pressure drop is equal to or greater than the predetermined threshold value in step S28, the controller 77 proceeds to step S29 to output a water leakage alarm and transmit a water leakage alarm signal to the monitoring center to output a water leakage alarm.

  On the other hand, when the controller 77 compares the primary average pressure P1a with the previous primary average pressure in step S24 and determines that both are constant and constant, the process proceeds to step S30, and the secondary average pressure P2a If it is determined that the previous secondary side average pressure has been compared and decreased, the process proceeds to step S28. If the pressure drop is equal to or higher than a predetermined threshold, the water leakage is determined, and the process proceeds to step S29 to output a water leakage alarm. A leak warning signal is sent to the monitoring center to output a leak warning.

[Secondary pressure abnormality monitoring control]
The control unit 77 provided in the CPU 76 of FIG. 5 performs the following secondary pressure abnormality monitoring control. The controller 77 controls the drainage control valve 36 to open when the secondary pressure P2 of the secondary pipe 20 detected by the secondary pressure sensor 50 exceeds a predetermined upper limit pressure threshold, and the secondary Control is performed to reduce the secondary side pressure P2 that has become abnormal due to drainage from the side pipe 20.

  Further, when the control unit 77 determines the secondary pressure abnormality and half-open controls the drainage control valve 36, the control unit 77 drains the amount of water less than the amount of drainage equivalent to the sprinkler working water but drains the amount of water exceeding the inoperative water. Because the valve body 26 of the water flow detection device 10 is opened, the flow amount Q calculated by the fire monitoring control shown in the flowchart of FIG. 7 becomes equal to or more than the threshold flow rate Qth. Since it is the amount of water flow, control is performed to prohibit the output of the water flow detection signal.

  In the sprinkler fire extinguishing facility, the secondary side pressure P2 of the secondary side pipe 20 of the flowing water detection device 10 may abnormally rise due to a high temperature such as summer, and the control unit 77 abnormally rises the secondary side pressure P2. By opening the drainage control valve 36 provided in the drainage pipe 34 from the water flow detection device 10, automatically lowering the abnormal secondary side pressure, and the secondary side piping 20 and the sprinkler head It is possible to reduce the stress applied to the piping connection device such as 22 and to suppress the failure occurrence of the facility device and to improve the durability.

  FIG. 9 is a flowchart showing the details of the secondary pressure abnormality monitoring control in step S3 of FIG. 6, which is control by the control unit 77 provided in the CPU 76.

  As shown in FIG. 9, the control unit 77 reads the latest secondary pressure P2 stored in the RAM 82 in step S31, and proceeds to step S33 when it is determined in step S32 that the pressure has risen above the predetermined abnormal threshold. The secondary pressure abnormality alarm is displayed on the display unit 60, and the secondary pressure abnormality alarm signal is transmitted to the monitoring center for alarming.

  Subsequently, the control unit 77 proceeds to step S34 to open control of the drainage control valve 36, and in step S35 prohibits the output of the water flow detection signal, and the secondary pressure P2 becomes a predetermined normal value in step S36. It is determined whether it has fallen.

  When the controller 77 determines in step S36 that the secondary pressure P2 has dropped to a normal value, the process proceeds to step S37, and the drainage control valve 36 is closed to stop drainage from the secondary piping 20 and then normally Return to monitoring status.

[Inspection control]
(Inspection control function)
The control unit 77 provided in the CPU 76 of FIG. 5 performs the following inspection control. The control unit 77 opens the drainage control valve 36 when receiving an inspection instruction by the operation of the inspection switch of the operation unit 62 or the reception of the inspection instruction signal from the monitoring center, and the secondary side piping 20 to the sprinkler head 22 An operation test is performed in which the valve body 26 is opened by drainage of the same flow rate as one unit has been operated.

  The control unit 77 detects the opening degree A of the opening degree sensor 46 and the primary pressure of the primary pressure sensor 48 in the same manner as the fire monitoring control shown in the flow chart of FIG. P1, the secondary pressure P2 of the secondary pressure sensor 50 is read, the capacity coefficient Cv is read out with reference to the capacity coefficient table 85 by the opening A, and the differential pressure ΔP is calculated as ΔP = P2-P1, and the capacity coefficient Cv Based on the differential pressure ΔP, the check water flow Q is calculated from the above (formula 2), and it is determined that the check water flow Q is normal if the check water flow Q is equal to or greater than a predetermined threshold flow Qth. If it does not satisfy the condition, it will be judged as an inspection error and control will be made to output an alarm to urge a precision inspection.

  Further, the control unit 77 controls to close the drainage control valve 36 when the inspection end instruction is determined, and is detected by the contact sensor 64 provided on the valve seat 30 when the valve body 26 is closed by stopping the flowing water. Load and load distribution applied to the valve seat 30 by the pressure of the valve body 26 are read, and closing and opening of the valve body 26, dust biting of the valve body 26, and damage or deterioration of the valve seat 30 are determined. Control is performed by displaying on the display unit 60 and transmitting it as a check result to the monitoring center.

  Here, as shown in FIG. 3, the contact sensor 64 is provided with the sensor main bodies 66 at a plurality of locations of the ring-shaped holder 65 to detect the pressing load. When the distribution state of the load applied to 30 is detected, and all the detection loads by the plurality of sensor bodies 66 in the contact sensor 64 are equal to or less than the predetermined release threshold value, it is determined that the valve body 26 is open. Control is performed to determine that the valve body 26 is closed if all of the detected loads according to the above are equal to or higher than a predetermined closing threshold value and within a predetermined load range.

  Further, the control unit 77 sets the dust bite or flaw of the valve body 26 when all of the detection loads by the plurality of sensor bodies 66 in the contact sensor 64 are equal to or more than the predetermined closing threshold and part of the detection load exceeds the load range. Alternatively, it is determined to be deteriorated and displayed on the display unit 60 and transmitted to the monitoring center as an inspection result to perform control to output an alarm for prompting a precise inspection indicating an internal abnormality of the valve.

  For this reason, the inspection qualified person can know the abnormality such as the bite of dirt, scratches or deterioration in the water flow detection device 10 which has conducted the inspection, and the failure, the failure prediction, the preventive maintenance (replacement before failure etc. Maintenance) can be understood without disassembling the valve, and the necessity of inspection and maintenance, judgment of failure, etc. can be made, and the reliability of maintenance and management of equipment can be increased.

(Check control operation)
FIG. 10 is a flowchart showing the details of the inspection control in step S4 of FIG. 6, which is control by the control unit 77 provided in the CPU 76.

  As shown in FIG. 10, when the control unit 77 determines that there is an inspection instruction in step S41, the control unit 77 enters an inspection mode, proceeds to step S42, and drains provided in the drainage pipe 34 drawn from the secondary side of the water detection device 10. The control valve 36 is controlled to open, and an operation test is performed to open the valve body 26 by drainage of the same flow rate as one of the sprinkler heads 22 is operated.

  Subsequently, the controller 77 detects the opening degree A of the valve body 26 detected by the opening degree sensor 46 in step S43, the primary side pressure P1 detected by the primary side pressure sensor 48, and the secondary side pressure sensor 50. The secondary pressure P2 is read by AD conversion, and then, at step S44, the capacity coefficient Cv corresponding to the opening degree A is read by referring to the capacity coefficient table 85 of the RAM 82 and the differential pressure ΔP is determined as ΔP = P2-P1. In step S45, the check water flow rate Q is calculated by calculation in accordance with the above (formula 2).

  Subsequently, the control unit 77 proceeds to step S46 and compares the inspection water flow rate Q calculated in step S45 with the threshold flow rate Qth corresponding to the sprinkler operation flow rate, and the drainage water corresponding to the operation of one sprinkler head If the valve body 26 is open, it is determined that the inspection water flow Q is equal to or more than the threshold flow rate Qth, and the process proceeds to step S47 to determine normality. On the other hand, the inspection water flow Q is the threshold flow rate in step S46. If it does not reach Qth, the process proceeds to step S48, an abnormality is determined as an inspection result, and the display unit 60 and the monitoring center notify of a request for a precision inspection.

  Even if the control unit 77 determines that the inspection water flow Q is equal to or higher than the threshold flow Qth in step S46, the control unit 77 does not output the water detection signal because it is in the inspection mode, and the fire alarm is not output erroneously .

  Subsequently, when the control unit 77 proceeds to step S49 and determines that there is an inspection end instruction based on the operation of the recovery switch of the operation unit 62 or the reception of a recovery signal from the monitoring center, etc., the control unit 77 proceeds to step S50 and closes the drainage control valve 36. Control is performed to stop the drainage, whereby the flow of water from the water flow detection device 10 is also stopped and the valve body 26 returns to the closed position and is restored.

  Subsequently, the control unit 77 reads a plurality of detected loads indicating the load distribution by the contact sensor 64 in step S51, and proceeds to step S53 if all the detected loads are equal to or more than the predetermined closing load in step S52. If the load is within the predetermined load range, it is determined that the closing load is uniform, and the process proceeds to step S54, and the valve body 26 is completely in close contact with the valve seat 30 and the check normal return is determined. End inspection control.

  On the other hand, when the valve body 26 is closed, if there is a dust bite in which dust is caught between the valve sheet and the seat 30, some of the plurality of detected loads detected by the contact sensor 64 are predetermined. Even if the load is less than the closing load or more than the predetermined threshold load, the load distribution is not uniform beyond the predetermined load range, and the load distribution of the valve seat 30 is abnormal at step S52 or step S52. If it is determined in S53, the process proceeds to step S55, the possibility of dust biting is determined, and a precision inspection request is displayed on the display unit 60 and notified by the monitoring center.

  In addition, even if the valve seat 30 is scratched or partially hardened due to deterioration, the load distribution applied to the valve seat 30 by the pressure of the valve body 26 becomes uneven, and the scratch or the deterioration is caused. Abnormality of the load distribution in the valve seat 30 caused is determined in step S52 or step S53, and the process proceeds to step S55 to determine the possibility of scratches and deterioration in addition to dust bite, and the precision inspection request is displayed on the display unit 60 At the same time as displaying it, let the monitoring center notify you.

(Repair judgment of water flow detection device)
Further, the control unit 77 determines that the detected opening degree A of the opening degree sensor 46 is a predetermined fully closed opening degree and the primary side pressure P1 detected by the primary side pressure sensor 48 as restoration determination of the water flow detection device 10 in inspection control. When the secondary pressure P2 detected by the secondary pressure sensor 50 becomes substantially the same, the normal recovery is determined, and in other cases, the recovery abnormality is determined and notified, and the promotion of detailed inspection is recommended. .

(Monitoring control of movement of valve body)
Further, when the valve body 26 of the water flow detection device 10 opens and closes by opening and closing the drainage control valve 36 in the inspection control, the control unit 77 opens time until the valve body 26 opens to a certain opening degree, If the closing time until the valve body 26 is completely closed is measured, and it is determined that the opening time and / or closing time is equal to or longer than a predetermined normal operation time, the movement of the valve body 26 is aggravated By outputting a fault alarm indicating that the movement of the valve body is bad, and by being aware of a sign of internal abnormality of the water flow detection device 10 such as rust, etc., and promoting promotion of detailed inspection, etc. Preventive maintenance is possible by enabling appropriate response.

[Fire monitoring control during inspection]
In addition to the inspection control shown in the flowchart of FIG. 10, the control unit 77 provided in the CPU 76 of FIG. 5 performs fire monitoring control during the next inspection.

  In order to perform fire monitoring control during inspection by the control unit 77, as shown in FIG. 1, the drainage control valve 36 is provided with the drainage opening degree sensor 92 and the drainage differential pressure sensor 94, and the control shown in FIG. In a capacity coefficient table 85 of the RAM 82 of the processor 75, a capacity coefficient Cv1 corresponding to the full opening degree A1 of the drainage control valve 36 is stored in advance. Note that, instead of the drainage differential pressure sensor 94, as in the case of the water flow detection device 10, a primary side pressure sensor and a secondary side pressure sensor may be provided.

  When the control unit 77 controls the drainage control valve 36 to open based on the inspection instruction, the displacement coefficient Cv1 read from the capacitance coefficient table 85 by the detection opening degree A1 of the drainage opening degree sensor 92 and the drainage differential pressure sensor 94 Based on the drainage differential pressure ΔP1 detected in the above, the drainage water amount Q1 is obtained from the above (formula 2), and when the water flow amount Q of the water detection device 10 by opening the valve body 26 is the same as the drainage water amount Q1 of the drainage control valve 36 Does not output water flow detection signal.

  On the other hand, when a fire occurs during inspection and the sprinkler head 22 operates, the flow rate Q of the water flow detection device 10 increases by a factor of two, so the control unit 77 controls the flow flow Q of the water flow detection device 10 In the case where the predetermined flow rate is equal to or more than a predetermined threshold flow rate Gth1 obtained by adding a predetermined sprinkler working flow rate to a predetermined drainage water volume by opening the drainage control valve 36, a fire is determined and control is performed to output a running water detection signal.

  Therefore, even when a fire occurs during inspection of the flush water detection device 10 with the drainage control valve 36 opened and the sprinkler head 22 is activated, flush water detection is automatically performed without the need for an operation such as inspection cancellation. A signal can be output to give a fire alarm.

  FIG. 11 is a flowchart showing the details of the fire monitoring control under inspection, which is control by the control unit 77 provided in the CPU 76.

  As shown in FIG. 11, the control unit 77 reads the opening degree A1 of the drainage control valve 36 and the differential pressure ΔP1 in step S61 during the inspection in which the drainage control valve 36 is opened, and corresponds to the opening degree A1 in step S62. The capacity coefficient Cv1 is read out from the capacity coefficient table 85, and in step S63, the drainage water amount Q1 is calculated from the above (formula 2).

  Subsequently, when it is determined in step S64 that the drainage water amount Q1 is different from the water flow amount Q of the water flow detection device 10, the control unit 77 proceeds to step S65 and adds a predetermined sprinkler head working water amount Q2 to the drainage water amount Q1. The threshold flow rate Qth2 is set, and if the flow rate Q of the water flow detection device 10 is equal to or greater than the threshold flow rate Qth1 in step S66, it is determined as a fire, and the flow proceeds to step S67 to output a water flow detection signal to cause a fire alarm.

  Subsequently, the control unit 77 proceeds to step S68, forcibly terminates the inspection by closing control of the drainage control valve 36, and discharges the extinguishing water from the operated sprinkler head without drainage.

[Management control of major components]
The control unit 77 provided in the CPU 76 of FIG. 5 includes a valve seat 30, an opening degree sensor 46, a primary pressure sensor 48, a secondary pressure sensor 50, a temperature sensor 52, and a contact sensor provided in the water flow detection device 10. 64 pre-store and manage management information such as predetermined major components including consumables, consumables, periodic replacements, etc., display necessary management information on the display unit 60 and notify the monitoring center to promote necessary response Control like that.

  For example, the control unit 77 stores, in advance in the RAM 82, management information such as the date of manufacture of main constituent devices, the date of replacement of consumables such as rubber, and regular replacements. Therefore, the inspection qualified person or the like can know the replacement time and the like by reading out the management information from the RAM 82 by the operation of the operation unit 62 and displaying it on the display unit 60 as necessary. In addition, when the replacement time is approaching, the control unit 77 displays a caution on the display unit 60, activates the caution indicator light, and further performs control to notify the monitoring center, etc. Inform and allow appropriate action.

  When the water detection device 10 is disassembled and replaced with a new one, it is necessary to correct the management information according to the consumables and regular replacements whose management information has been replaced, but when replacement repair is completed and the power is turned on again. By displaying a message prompting the user to correct the management information on the display unit 60, the management information is corrected, and the management of the next replacement time is correct even for the consumables and regular replacements that have been exchanged. It becomes possible.

[Fault tolerant to sensor failure]
(Contact sensor)
When any of the opening degree sensor 46, the primary pressure sensor 48, and the secondary pressure sensor 50 breaks down, the control unit 77 provided in the CPU 76 of FIG. Even if the valve body 26 of 10 is opened, it is not possible to output the water flow detection signal by the fire monitoring control shown in the flowchart of FIG. 7.

  Therefore, the control unit 77 has a control function of determining the opening of the valve body 26 and outputting a water flow detection signal when the load detected by the contact sensor 64 falls below the predetermined opening load, and the water flow by fire monitoring control Control to output at least one of the detection signal and the flowing water detection signal based on the contact sensor 64, that is, control to output the flowing water detection signal by the OR output of both.

  For this reason, even when any of the opening degree sensor 46, the primary side pressure sensor 48, and the secondary side pressure sensor 50 is broken and the flow rate can not be calculated, the contact sensor 64 detects the opening of the valve body 26 and detects flowing water. By outputting the detection signal, even when some sensors fail, determination by other sensors becomes possible, and it is possible to realize fault tolerance to sensor failure and improve reliability.

  The reliability may be enhanced as an AND output that outputs the fire detection signal to the outside when both the water flow detection signal by the fire monitoring control and the fire detection signal based on the contact sensor 64 are obtained.

(Temperature sensor)
If any of the opening degree sensor 46, the primary pressure sensor 48, and the secondary pressure sensor 50 fails and the contact sensor 64 also fails, the control unit 77 provided in the CPU 76 of FIG. Can not be output.

  In order to solve this problem, as shown in FIG. 1, a temperature sensor 52 for detecting the temperature by immersing in the fire extinguishing water on the secondary side of the water flow detection device 10 is provided, and the control unit 77 operates the sprinkler head 22. Focusing on the point that the temperature detected by the temperature sensor 52 decreases when the fire extinguishing water flows into the fresh water detecting device 10, the flowing water by the operation of the sprinkler head is determined from the temperature decrease of the extinguishing water of the temperature sensor 52, and the flowing water detection signal It has a control function to output.

  Therefore, even if any of the opening degree sensor 46, the primary side pressure sensor 48, and the secondary side pressure sensor 50 breaks down, and the contact sensor 64 also breaks down and the flowing water detection signal is not output, the temperature by the temperature sensor 52 By detecting a drop and outputting a water flow detection signal, even if some sensors fail, determination by other sensors becomes possible, and it is possible to realize fault tolerance to sensor failure and to improve reliability.

  The reliability is enhanced as an AND output that outputs the fire detection signal to the outside when all of the water detection signal based on the fire monitoring control, the fire detection signal based on the contact sensor 64, and the water detection signal based on the temperature sensor 52 are obtained. You may do so.

(Fire judgment by combination of multiple sensors)
If any of the opening degree sensor 46, the primary pressure sensor 48, and the secondary pressure sensor 50 fails and the contact sensor 64 also fails, the control unit 77 provided in the CPU 76 of FIG. Can not be output.

  Therefore, when the opening degree of the valve body 26 detected by the opening degree sensor 46 is equal to or more than the predetermined opening degree, the presence of flowing water is detected to determine a fire, and based on the primary side pressure sensor 48 and the secondary side pressure sensor 50. If the differential pressure detected is higher than the specified differential pressure, the presence of flowing water is detected to determine a fire, and furthermore, if the load detected by the contact sensor 64 becomes smaller than the predetermined load, the presence of flowing water is determined to determine a fire The control unit 77 detects the opening of the valve body 26 by the opening degree sensor 46, the predetermined differential pressure detection by the primary side pressure sensor 48 and the secondary side pressure sensor 50, or the drop detection of the load by the contact sensor 64. When at least two detection conditions of are satisfied, the determination of the fire is determined and control is performed to output a water flow detection signal.

  As described above, when a fire is determined based on a combination of detection conditions by two sensors, failsafe can be achieved by determining the fire with the remaining sensors even if any of the three sensors fail. Can.

  Further, the reliability of the fire determination can be improved by determining the fire when the detection conditions by all the sensors are satisfied.

[Modification of the present invention]
(Sensor)
Although the above-mentioned embodiment is provided with an opening degree sensor, a pressure sensor on the primary side and a secondary side, a contact sensor, and a temperature sensor for fire monitoring control and inspection control by a water flow detection device, in addition to this, a vibration sensor An appropriate sensor such as a strain sensor may be provided to perform control of the water flow detection device and status monitoring.

(Controller unit)
Also, at the time of inspection, in order to check whether the water flow detection signal is reliably output to the outside from the control unit provided in the water flow detection device, for example, a signal connection portion is provided on the output side of the wired communication unit If the inspection control is performed by inserting the above, it is possible to confirm the inspection normality by the output of the flowing water detection signal by the jig with the memory without outputting the flowing water detection signal to the monitoring center.

  In addition, when the jig with memory is removed, the signal connection section that has been cut off is connected, and if there is a problem with the signal line, the signal line monitoring circuit can identify disconnection or short circuit etc. , The normality of the output system of the water flow detection signal can be confirmed.

(Contact sensor)
In the above embodiment, although the contact sensor is a plurality of separate bodies, it may be a ring-shaped continuous body and may detect loads at a plurality of places.

(Estimate the number of sprinkler operation)
In the above embodiment, whether or not the sprinkler head has been operated is detected from the flow rate. However, the number of sprinkler heads operated may be estimated from the flow rate. Further, the number may be displayed on the display unit 60 or a monitoring center.

(Others)
Further, the present invention includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values shown in the above-described embodiment.

10: Water flow detection device 12: Device main body 14: Inlet 16: Outlet 18: Primary piping 20: Secondary piping 22: Sprinkler head 24: Valve shaft 26: Valve body 28: Valve seat 30: Valve seat 32 : Drain 34: Drain 36: Drain control valve 38: Case cover 40: Control unit 42: Power cable 44: Signal cable 46: Opening degree sensor 47, 51, 53: Sensor plug 48: Primary side pressure sensor 50: Two Next side pressure sensor 52: temperature sensor 54, 56: sensor connector 60: display unit 62: operation unit 64: contact sensor 65: holder 66: sensor main body 68: conductive rubber 70, 72: electrode 74a, 74b: lead wire 75 : Control processor 76: CPU
77: Control unit 78: Control logic 80: ROM
82: RAM
84: bus 85: capacity coefficient table 86: wireless communication unit 90: wired communication unit 92: drainage opening degree sensor 94: drainage differential pressure sensor

Claims (21)

In a water flow detection device that detects water flow due to the operation of a sprinkler head and outputs a water flow detection signal,
An opening degree sensor that detects the opening degree of a valve body that opens and closes according to flowing water;
A pressure sensor comprising a primary side pressure sensor for detecting the primary side pressure of the valve body and a secondary side pressure sensor for detecting the secondary side pressure of the valve body;
The flow rate flowing from the primary side to the secondary side is determined based on the differential pressure between the primary pressure and the secondary pressure and the capacity coefficient corresponding to the valve opening degree, and A control unit that outputs the flowing water detection signal when
The water flow detection apparatus characterized by being provided.
The water flow detection device according to claim 1, wherein the control unit determines and reports water leakage from temporal changes in the primary side pressure and the secondary side pressure detected by the pressure sensor. Water flow detection device to be.
In the water flow detection device according to claim 1,
The valve body is rotatably supported by a valve shaft,
The opening degree sensor is a rotation angle sensor that detects a rotation angle of the valve shaft, a rotation sensor that detects a rotation amount of the valve shaft, or an encoder that outputs a pulse signal according to the rotation of the valve shaft. Water flow detection device characterized by.
In the water flow detection device according to claim 1,
The pressure sensor introduces the primary side pressure and the secondary side pressure, and outputs a differential pressure detection signal according to the primary side pressure, the secondary side pressure, and a differential pressure. Detection device.
The water flow detection device according to any one of the preceding claims, wherein the opening degree sensor and the pressure sensor have a MEMS structure.
In a water flow detection device that detects water flow due to the operation of a sprinkler head and outputs a water flow detection signal,
A contact sensor that detects a load applied when the valve body is seated on the valve seat is provided on a valve body or a seat provided on the valve seat that opens and closes according to flowing water.
And a control unit configured to determine and output the closing and opening of the valve body and the abnormality of the valve body based on the pressing load detected by the contact sensor.
In the water flow detection device according to claim 6,
The contact sensors are provided at a plurality of places on the sheet,
The control unit
When all the loads detected by the plurality of contact sensors are equal to or less than a predetermined opening threshold value, it is determined that the valve body is open,
When all the detected loads by the plurality of contact sensors are equal to or more than a predetermined closing threshold value and within a predetermined load range, it is determined that the valve body is closed.
Water flow detection characterized in that when all detected loads by the plurality of contact sensors are equal to or greater than a predetermined closing threshold and a part of detected loads exceeds the load range, the valve body is judged to be dust bite or scratch apparatus.
The water flow detection device according to claim 6 or 7, wherein the contact sensor changes a resistance value according to a pressure load of the valve body.
In the water flow detection device according to claim 1,
Furthermore, a drainage control valve is provided to drain the secondary side of the valve body,
The control unit opens the drainage control valve when the secondary pressure detected by the pressure sensor exceeds a predetermined upper limit pressure threshold, and reduces the secondary pressure by drainage on the secondary side. Water flow detection device characterized in that
In the water flow detection device according to claim 9,
When the control unit receives a predetermined inspection instruction, the control unit opens the drainage control valve and causes the drainage from the secondary side to open the valve body, and the pressure sensor detects the opening degree of the opening sensor, the pressure sensor And detecting the detected pressure and the flow rate calculated by the control unit, and notifying a fault alert when an abnormality is determined from the measurement result.
The water flow detection device according to claim 9 or 10, wherein, when the drainage control valve is opened, the control unit does not output the water flow detection signal even if the water flow rate becomes equal to or more than the operation flow rate. Water flow detection device characterized by having done.
In the water flow detection device according to claim 9,
The control unit is configured to stop the drainage control valve and stop drainage from the secondary side, the primary side detected by the pressure sensor when the detection degree of the opening sensor is a predetermined full closing degree. A water flow detection device characterized in that normal recovery is determined when pressure and secondary pressure become substantially the same, and determination and notification of recovery abnormality is made in other cases.
10. The water flow detection device according to claim 9, wherein, when the drainage control valve is opened or closed, the control unit causes a temporal change in the opening degree of the valve body detected by the opening degree sensor. A fluid detection device characterized by determining and notifying the propriety of the movement of the body.
In the water flow detection device according to claim 9,
The drainage control valve is provided with a drainage opening sensor for detecting a drainage opening and a drainage pressure sensor for detecting a differential pressure between a primary side pressure and a secondary side pressure,
The control valve determines the amount of drainage water based on the differential pressure detected by the drainage pressure sensor when the drainage control valve is opened and a volume coefficient corresponding to the detection opening degree of the drainage opening degree sensor,
If the amount of water flow by opening the valve body is the same as the amount of drainage water by the drainage control valve, the flow detection signal is not output, and the amount of water flow by opening the valve body is a predetermined amount of drainage water by opening the drainage control valve A water flow detection device characterized by outputting a water flow detection signal when the flow rate is equal to or more than a predetermined sprinkler head working flow rate.
The water flow detection device according to claim 1, wherein the control unit stores and manages in advance management information of predetermined main constituent devices including the valve body, the opening degree sensor and the pressure sensor. Water flow detection device.
The water flow detection device according to claim 15, wherein the control unit manages a replacement time of the main component equipment and notifies that the replacement time has come.
The water flow detection device according to claim 1, wherein the control unit comprises a computer circuit including a CPU, a memory, an input / output port, a display unit, and an operation unit, and the function of the control unit is predetermined by the CPU. A water flow detection device characterized by being realized by execution of a program.
18. The water flow detection device according to claim 17, wherein the control unit further includes a communication unit, and the detected opening degree of the opening degree sensor, the detected pressure of the pressure sensor, and the water flow rate calculated by the control unit. And the flowing water detection apparatus characterized by transmitting the said flowing water detection signal to the external high-order apparatus by the said communication part, and making it process it.
In the water flow detection device according to claim 1,
A contact sensor that detects a load applied when the valve body is seated on the valve seat is provided on a valve body or a seat provided on the valve seat that opens and closes according to flowing water.
The said control part determines the open | release of the said valve body by the said contact sensor, and when the said opening degree sensor and the said pressure sensor malfunction, it is characterized by outputting the said flowing water detection signal.
In the water flow detection device according to claim 19,
Furthermore, a temperature sensor is provided to detect the temperature of the extinguishing water filled in the piping,
When the opening degree sensor, the pressure sensor, and the contact sensor fail, the control unit determines the flowing water from a predetermined change in the temperature detected by the temperature sensor and outputs the flowing water detection signal. Water flow detection device.
In a water flow detection device that detects water flow due to the operation of a sprinkler head and outputs a water flow detection signal,
An opening degree sensor that detects the opening degree of a valve body that opens and closes according to flowing water;
A pressure sensor that detects a differential pressure between the primary side pressure and the secondary side pressure of the valve body;
A contact sensor for detecting a load applied when the valve body is seated on a valve seat;
A fire is determined when at least two of the detection conditions of the opening detection of the valve body by the opening degree sensor, the predetermined differential pressure detection by the pressure sensor, or the drop detection of the load by the contact sensor are satisfied. A control unit that outputs a water flow detection signal;
The water flow detection apparatus characterized by being provided.

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