JPH0370986B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure relief device for fire extinguishing equipment that prevents an abnormal rise in pressure in the secondary side piping of an alarm valve in sprinkler fire extinguishing equipment, foam fire extinguishing equipment, or the like.

(Prior art) Conventionally, for example, in the case of sprinkler fire extinguishing equipment, a main water supply pipe from a fire pump installed in the basement, etc. is set up vertically in the building, and running water is detected in each floor of the main water supply pipe. The branch pipes are connected via alarm valves (automatic alarm valves) that generate detection outputs, and the branch pipes are equipped with a plurality of closed sprinkler heads.

In addition, since the lower floors of the building are close to the discharge side of the fire pump and receive high pressure close to the pump discharge pressure, a secondary pressure control valve is installed in front of the alarm valve, so that the pump discharge pressure is, for example, 12Kgf/cm ² Even if the branch pipe pressure is the specified pressure, for example 10Kgf/
I try to keep it at ^cm2 .

Furthermore, the end of each branch pipe is connected to the drain pipe via an electric valve for testing, and when inspected, the electric valve is opened to produce a water flow equivalent to the operating flow rate of one sprinkler head regulated by an orifice. The water is flowed into a branch pipe, and this water flow activates an alarm valve to enable a comprehensive test in which the fire pump is started and operated.

(Problem to be solved by the invention) However, in the case of such sprinkler fire extinguishing equipment, a comprehensive test is carried out by opening the electric valve installed at the end of the branch pipe on the lower floor where the secondary pressure control valve is installed. When we conducted this test, there was a delay in the closing operation of the secondary pressure control valve when closing the electric valve at the end of the test, and as a result, after the test was completed, the internal pressure of the branch pipe reached a high pressure equivalent to the pump discharge pressure. There was a problem in that the manual valve installed at the end of the branch pipe had to be opened to lower the branch pipe pressure to the specified pressure after the inspection was completed.

Such problems also occur with foam fire extinguishing equipment.

In other words, in the case of foam fire extinguishing equipment, the fire extinguishing water from the fire pump is mixed with the chemical solution from the chemical tank and supplied to the water main, and the water main is connected to the end of the pipe via an alarm valve and a simultaneous release valve. Multiple open foam heads are connected to the pipes, and during steady monitoring, the simultaneous release valve is closed to pressurize the fire extinguishing chemical solution in the water supply main from the simultaneous release valve's primary side to the fire pump discharge side. It is maintained and filled.

However, in the case of such foam fire extinguishing equipment, in seasons when the temperature is high such as summer,
Extinguishing agent filled in the water supply mains, especially the extinguishing agent filled in the pipeline between the alarm valve and the simultaneous release valve, may cause the pressure inside the pipe to become abnormally high due to temperature rise, so check the pressure inside the pipe regularly. It was necessary to evacuate the pressure using a manual valve.

(Means for Solving the Problems) The present invention has been made in view of the above-mentioned problems in the prior art. To provide a pressure relief device for fire extinguishing equipment that can automatically discharge pressure and maintain the pressure inside a pipe at a specified pressure even if the pressure inside the pipe becomes abnormally high.

In order to achieve this objective, the present invention provides an alarm valve that is installed at a piping site on the secondary side where a pressure increase is expected, such as during steady monitoring when the pipe internal pressure is maintained at a specified pressure or at the end of a fire pump operation test. In a pressure relief device for fire extinguishing equipment, the pressure sensor detects abnormal pressure in the piping section, the pressure relief piping connects the piping section to a drain pipe, and the pressure sensor installed in the pressure relief piping detects the pressure sensor. The valve is provided with an on-off valve that is driven to open by an output, and an orifice that regulates the flow rate of the relief pipe when the on-off valve is opened to below the operating flow rate of the alarm valve.

(Function) According to the configuration of the present invention, for example, in the case of a sprinkler fire extinguishing system, a piping system in which a branch pipe equipped with a sprinkler head is connected to a main water supply pipe via a secondary pressure control valve and an alarm valve. in,
When conducting a comprehensive test in which the electric valve installed at the end of the branch pipe was opened and the fire pump was started,
When the electric valve is closed at the end of the test, the internal pressure of the branch pipe becomes abnormally high due to a delay in the response of the secondary pressure control valve, but this abnormality in branch pipe pressure is detected by a pressure switch and a pressure relief pipe is installed. The branch pipe pressure can be lowered to the specified pressure by driving the on-off valve open and discharging with a relief flow rate that is less than the alarm valve activation flow rate determined by the orifice, making it unnecessary to perform pressure relief work after the completion of the comprehensive test.

In addition, in the case of foam fire extinguishing equipment, even if the pressure inside the pipe between the alarm valve and the simultaneous release valve becomes abnormally high in the summer, etc., a pressure switch detects the abnormal pressure and opens the on-off valve to prevent the alarm valve from activating. The pressure is discharged with a certain flow rate, thereby making it possible to always maintain the pressure inside the pipe at the specified pressure in the steady monitoring state.

(Embodiment) FIG. 1 is an explanatory diagram showing an embodiment of the present invention, taking a sprinkler fire extinguishing system as an example.

First, to explain the configuration, 1 is a fire pump, and 2 is a motor. The fire pump 1 and the motor 2 are installed, for example, in the basement of a building, and when the motor 2 is started up by the pump control device 3, the fire pump 1 is moved to the underground water tank 4. The fire extinguishing water pumped up from the suction pipe 5 is pressurized, and the pressurized fire extinguishing water is supplied to the main water supply pipe 7 via the gate valve 6. In addition, a priming tank 11 is provided as ancillary equipment to the fire pump 1.
The priming water is supplied to the fire extinguishing pump 1 through a check valve, so that the inside of the pump is always filled with water.

The main water supply pipe 7 is erected in the vertical direction of the building, and a branch pipe 9 is connected to the upper floors of the building via an alarm valve 8, and a plurality of sprinkler heads 10 are attached to the branch pipe 9. On the other hand, a branch pipe 9 is connected to the lower floor via a secondary pressure control valve 12 and an alarm valve 8, and a plurality of sprinkler heads 10 are attached to the branch pipe 9.

The end of the branch pipe 9 on the upper floor is an electric valve 13 for testing.
and a drain pipe 15 via an orifice 14, and the orifice 14 connects to the sprinkler head 1 connected to the branch pipe 9 when the electric valve 13 is opened.
A flow rate corresponding to the operating flow rate for each part is allowed to flow into the drain pipe 15.

On the other hand, the pipe end of the branch pipe 9 on the lower floor equipped with the secondary pressure control valve 12 is also connected to the drain pipe 15 via the electric valve 13 and orifice 14 for testing. Sprinkler head 1 connected to branch pipe 9 when 13 is opened
The flow rate corresponding to the operating flow rate for one unit of 0 is drained into drain pipe 1.
It will now flow to 5.

In such sprinkler fire extinguishing equipment,
Fire pump 1 by opening an electric valve 13 provided at the end of a branch pipe 9 on a lower floor equipped with a secondary pressure control valve 12
During the operation test, if the electric valve 13 was closed at the end of the test, the internal pressure of the branch pipe 9 would reach a high pressure state close to the pump discharge pressure of the fire pump 1 due to the response delay of the secondary pressure control valve 12. , the pressure relief device of the present invention is installed at the end of the branch pipe 9 equipped with the secondary pressure control valve 12.

That is, the pressure relief device of the present invention includes a pressure switch 16 that detects abnormal pressure in the branch pipe 9, and a pressure switch 16 that detects abnormal pressure in the branch pipe 9.
Pressure relief pipe 17 connecting the end of the pipe to the drain pipe 15
Then, the pressure relief pipe 17 is provided in the middle and is driven to open by the detection output of the pressure switch 16. It is comprised of a solenoid valve 18 as an on-off valve and an orifice 19 that regulates the relief flow rate of the pressure relief pipe 17 to below the operating flow rate of the alarm valve 8 when the solenoid valve 18 is opened.

For example, if the specified pressure of the branch pipe 9 in the steady state of monitoring is 10 kgf/cm ² , the pressure switch 16 is set to the specified pressure of 10 kgf/cm 2 , and the set pressure is set to 10 kgf/cm ² . 10Kg
When the internal pressure of the branch pipe 9 exceeds f/cm ² , the switch is turned on to drive the solenoid valve 18 open, and when the internal pressure of the branch pipe 9 returns to the set pressure, the switch is turned off and the solenoid valve 18 is driven to close.

Furthermore, the detection output of the alarm valve 8 is sent to the fire receiver 20.
The fire receiver 20 displays a fire alarm based on the detection output of the alarm valve 8, outputs a pump start signal to the pump control panel 3, and starts the fire pump 1 by driving the motor 2. I am trying to perform a startup operation.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

Now, if the electric valve 13 installed at the end of the branch pipe 9 on the lower floor equipped with the secondary pressure control valve 12 is opened for a comprehensive test by an automatic inspection device (not shown), the sprinkler determined by the orifice 14 The operating flow rate equivalent to one head flows through the alarm valve 8 to the branch pipe 9, and the valve mechanism of the alarm valve 8 is activated by the water flow in the branch pipe 9 due to the opening of the electric valve 13, and the detection output is received as a fire alarm. output to the machine 20. The fire receiver 20 that receives the detection output from the alarm valve 8 outputs a pump start signal to the pump control panel 3, and the pump control panel 3 first starts the motor 2 with the Y connection, and after a certain period of time switches to the △ connection. Operate fire pump 1.

If the pump is started normally by opening the electric valve 13 in this way, operation data such as the voltage and current of the motor 2 and the discharge pressure and suction pressure of the fire pump 1 are collected to obtain normal operation data. If possible, first close the electric valve 13, and by closing the electric valve 13, the branch pipe 9 is closed.
The fire pump 1 is stopped when the pressure inside the pipe is restored.

At the end of the test due to the closure of the motorized valve 13, there is a delay in the operation of the secondary pressure control valve 12 with respect to the closure of the motorized valve 13, and when the closure of the motorized valve 13 is completed, the internal pressure of the branch pipe 9 is the same. The pressure rises to a value close to the pump discharge pressure, which is higher than the pressure. Therefore, the pressure switch 16 detects an abnormal increase in the pressure inside the branch pipe 9 and opens the solenoid valve 18.
When the solenoid valve 18 is opened, the pressure in the branch pipe 9 is drained from the pressure relief pipe 17 to the drain pipe 15 with a relief flow rate that is less than the operating flow rate of the alarm valve 8 determined by the orifice 19, which causes an abnormality in the branch pipe 9. When the pressure decreases to the specified pressure, pressure switch 1
6 becomes a switch-off and closes the electromagnetic valve 18, and automatically adjusts the internal pressure in the branch pipe 9 to the specified pressure after the completion of the comprehensive test.

FIG. 2 is an explanatory diagram showing another embodiment of the present invention using foam fire extinguishing equipment as an example.

In Fig. 2, the extinguishing pump 1, motor 2, pump control device 3, underground water tank 4, suction pipe 5, gate valve 6, and priming water tank 11 are the same as in Fig. 1, but since they are foam fire extinguishing equipment, A chemical tank 21 is installed near the fire pump 1, and pressurized water for extruding the chemical is supplied from the discharge side of the fire pump 1 to the chemical tank 21 through a pipe 22, and a mixer 23 is connected to the water supply pipe 7. The chemical liquid pushed out from the chemical tank 21 is mixed with fire extinguishing water at a predetermined ratio in a mixer 23, and the mixture is supplied to the end of the pipe.

The water supply pipe 7 on the secondary side of the mixer 23 is connected to the gate valve 2
4. It is connected via an alarm valve 25 and a simultaneous release valve 26 to a plurality of foam heads 27 provided in areas to be extinguished such as parking lots. In addition, sprinkler heads 28 are installed in areas to be extinguished such as parking lots where foam heads 27 are installed, and when one of the sprinkler heads 28 is thermally operated to release extinguishing agent, a liquid flow is generated in the simultaneous release valve 26. As a result, the release valve 26 is driven to open.
Incidentally, a fire detector may be installed in place of the sprinkler head 28, and a fire detection output may drive a simultaneous release valve (electric type) to open.

Further, a pressure tank 29 is installed near the fire pump 1, and pressurized water from the water supply pipe 7 on the primary side of the mixer 27 is introduced into the pressure tank 29 through a pipe 30, and the internal air is removed by introducing the pressurized water. This compressed air maintains the internal pressure of the water supply pipe 7 at the specified pressure when the fire pump 1 is stopped, and also reduces the tank pressure when the simultaneous release valve 26 is driven open by the detection output of the fire detector 28. Pressure switch 3
2, it is detected and the pump control device 3 is configured to start the pump.

In such foam fire extinguishing equipment, since the simultaneous release valve 26 is in a closed state in the steady monitoring state, the water supply pipe 7 from the primary side of the simultaneous release valve 26 to the discharge side of the fire pump 1 is is maintained at a specified pressure inside the pipe, the primary side of the mixer 23 is filled with fire extinguishing water, and the secondary side of the mixer 23 is filled with extinguishing agent. The pressure inside the pipe is abnormally high due to the extinguishing agent in the water supply piping 7 on the secondary side of the container 23, especially the extinguishing agent filled in the pipe between the alarm valve 25 and the simultaneous release valve 26, which are directly affected by the outside temperature. It may happen.

Therefore, the pressure relief device of the present invention is installed at a piping site between the alarm valve 25 and the simultaneous release valve 26 in the foam fire extinguishing equipment.

That is, a pressure relief pipe 36 is connected to the drain pipe 34 from the pipe between the alarm valve 25 and the simultaneous release valve 26, and the pressure relief pipe 36 is provided with a solenoid valve 38 and an orifice 40, and the primary A pressure switch 42 is provided on the side to detect abnormal pressure in the pipeline between the alarm valve 25 and the simultaneous release valve 26. Of course, the orifice 40 regulates the flow rate so that when the electromagnetic valve 38 is opened, a relief flow rate lower than the operating flow rate of the alarm valve 25 flows into the pressure relief pipe 36.

Next, the operation of the embodiment shown in FIG. 2 will be explained. In the steady monitoring state, the internal pressure of the water supply pipe 7 is maintained at a specified pressure, for example, 10 Kgf/cm ² , but the pressure on the secondary side of the mixer 23 Since the water supply pipe 7 is filled with extinguishing agent, when the temperature rises in the summer, etc., the extinguishing agent in the water supply pipe 7, especially between the alarm valve 25 and the simultaneous release valve 26, The pressure inside the pipe becomes abnormally high. When the pressure switch 42 receives a pressure in the pipe that exceeds the set pressure due to this rise in pipe pressure, it closes the switch contact and opens the solenoid valve 38, so that the relief flow rate is lower than the operating flow rate of the alarm valve 25 determined by the orifice 40. fire extinguishing agent is now discharged into the drain pipe 34.
Due to the discharge of this extinguishing agent, the pressure inside the pipe increases to the pressure switch 4.
When the pressure drops to the set pressure 2, the switch is turned off and the solenoid valve 38 is driven to close, so that the pressure in the pipe between the alarm valve 25 and the simultaneous release valve 26 is always maintained at the specified pressure.

The upper air examples include an abnormal pressure rise at the end of a comprehensive test of a branch pipe equipped with a secondary pressure control valve on a lower floor in a sprinkler fire extinguishing system, and an alarm valve and simultaneous release valve in a foam fire extinguishing system. Although the present invention is not limited to this, the present invention is not limited to this, and the present invention is not limited to this. It can be applied as is to any appropriate piping site.

(Effects of the Invention) As explained above, according to the present invention, the alarm valve secondary side where a pressure increase is expected in a steady monitoring state where the pipe pressure is maintained at a specified pressure or at the end of a fire pump operation test, etc. In the pressure relief device of fire extinguishing equipment installed in piping parts of The opening/closing valve installed in the pressure relief piping that connects the piping part to the drain pipe is opened and closed, and the flow rate of the relief piping when the opening/closing valve is opened is regulated by an orifice to below the operating flow rate of the alarm valve. For example, in sprinkler fire extinguishing equipment, an abnormal rise in branch pipe pressure at the end of a comprehensive test due to the opening of a motorized valve at the end of a branch pipe equipped with a secondary pressure control valve is automatically suppressed, and after the test is completed, the pressure inside the branch pipe is In the case of foam fire extinguishing equipment, the pipe line between the alarm valve and the simultaneous release valve is filled with the extinguishing agent at the specified pressure, and the abnormal pressure caused by the rise in outside temperature can be maintained at the specified pressure. By discharging water and maintaining it at the specified pressure, and by always maintaining the pressure inside the piping at the specified pressure in the parts of the piping where a pressure increase is expected in fire extinguishing equipment, leakage and damage to the piping system due to abnormal pressure increases can be prevented. This can be prevented and the durability of fire extinguishing equipment can be guaranteed.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing one embodiment of the present invention using a sprinkler fire extinguishing system as an example, and FIG. 2 is an explanatory diagram showing another embodiment of the present invention using a foam fire extinguishing system as an example. . 1: Fire pump, 2: Motor, 3: Pump control panel, 4: Underground water tank, 5: Suction pipe, 6: Gate valve,
7: Water supply piping, 8, 25: Alarm valve, 9: Branch pipe, 10: Sprinkler head, 11: Priming tank, 12: Secondary pressure control valve, 13: Electric valve, 14,
19, 40: Orifice, 15, 34: Drain pipe,
16, 42: Pressure switch, 17, 36: Pressure relief piping, 18, 38: Solenoid valve (on/off valve), 21:
Chemical tank, 23: mixer, 26: simultaneous release valve,
27: Foam head, 28: Sprinkler head,
29: Pressure tank, 32: Pressure switch.

Claims (1)

[Scope of Claims] 1. Pressure relief for fire extinguishing equipment installed in a piping section on the secondary side of an alarm valve where a pressure increase is expected during a steady monitoring state in which the pipe pressure is maintained at a specified pressure or at the end of a fire pump operation test, etc. The device includes: a pressure sensor that detects abnormal pressure in the piping section; a pressure relief pipe that connects the piping section to a drain pipe; and a pressure relief pipe that is provided in the pressure relief piping and is driven to open by the detection output of the pressure sensor. 1. A pressure relief device for fire extinguishing equipment, comprising an on-off valve and an orifice that regulates the flow rate of the relief pipe when the on-off valve is open to below the operating flow rate of the alarm valve.