JPH07265456A - Fire extinguishing facility - Google Patents

Abstract

PURPOSE:To make pressure rise absorbed and to guarantee the performance of an automatic alarm valve. CONSTITUTION:In this fire extinguishing facility which performs fire extinguishment by force feeding water for fire extinguishment to a sprinkler means 49 via the automatic alarm valve 31 by a pressure water supply device 28 and performing fire extinction by spraying water, and a valve means 50 which releases the pressure rise on the secondary side of the automatic alarm value 31 to the primary side and blocks a flow from the primary side to the secondary side are formed in parallel with the automatic alarm valve 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire extinguishing system for preventing a pressure rise on the secondary side of an automatic alarm valve.

[0002]

2. Description of the Related Art As a conventional sprinkler fire extinguishing facility, for example, one shown in FIG. 3 is known. Figure 3
, 1 is a fire pump, 2 is a pump motor,
The fire extinguishing pump 1 and the pump motor 2 constitute a pressurized water supply device 3 that pumps pressurized water.

The pressurized water supply device 3 sends pressurized water to a sprinkler head 4 as a water sprinkling means through an automatic alarm valve (flowing water detection device) 5. The sprinkler head 4 is sealed by a thermal fuse or the like that melts due to heat. Therefore, during normal monitoring, fire extinguishing water is pressurized and sealed in the water supply main 6 from the pressurized water supply device 3 to the automatic alarm valve 5 and the water supply pipe 7 from the automatic alarm valve 5 to the sprinkler head 4. There is.

When a fire occurs, the thermal fuse in the sprinkler head 4 is melted by heat, and the sealing of the sprinkler head 4 is released. Therefore, the water supply main 6
Also, the pressure in the water supply pipe 7 decreases, and this pressure decrease is detected by the pressure switch 9 provided in the pressure tank 8 connected to the water supply main pipe 6. The detection signal from the pressure switch 9 is sent to the fire pump control panel 10, and the fire pump control panel 10
Thus, the pressurized water supply device 3 operates.

The pressure tank 8 adjusts the pressure so that the pressurized water supply device 3 does not operate even with a slight pressure change due to water leakage from the water supply main pipe 6 and the water supply pipe 7. The fire pump control panel 10 activates the pressurized water supply device 3 by the detection signal from the pressure switch 9, whereby the fire extinguishing water is pressurized to the sprinkler head 4 via the automatic alarm valve 5, and the sprinkler head 4 sprays water. To start. The automatic alarm valve 5 detects the flow of pressurized water and outputs an alarm.

In the summer, etc., the pressure in the water supply pipe 7 on the secondary side of the automatic alarm valve 5 may rise abnormally.
If the pressure in the water supply pipe 7 rises abnormally, water may leak from the sprinkler head 4 or other components may be damaged. Therefore, for example,
As disclosed in Japanese Patent No. 41717, it has been proposed that both the inflow and outflow sides of an automatic alarm valve be communicated with each other by a throttle mechanism such as an orifice so that a pressure tank absorbs an increase in pressure.

Next, as another conventional example, a foam extinguishing system as shown in FIG. 4 is known. In FIG. 4, 1 is a fire pump, 2 is a pump motor, and these fire pump 1 and pump motor 2 constitute a pressurized water supply device 3. The pressurized water supply device 3 pressurizes and sends the fire-extinguishing liquid through the automatic alarm valve 5 to the simultaneous opening valve 12 to which the foam head 11 as the foam discharging means is connected. The simultaneous opening valve 12 is connected to a sensing head 13 that is activated when heat from a fire is sensed.

During normal monitoring, water for extinguishing water is provided in the water supply main 6 from the pressurized water supply device 3 to the mixer 15, and the water supply main 6 from the mixer 15 to the automatic alarm valve 5 and the automatic alarm valve 5 are simultaneously opened. The mixed liquid is pressurized and sealed in the water supply pipe 7 reaching the valve 12. When a fire occurs, the sensing head 13 operates and the simultaneous open valve 12 is opened. For this reason, the pressures in the main water supply pipe 6 and the main water supply pipe 7 decrease, and this pressure decrease is detected by the pressure switch 9 provided in the pressure tank 8 connected to the main water supply pipe 6. The detection signal from the pressure switch 9 is sent to the fire pump control panel 10, and the fire pump control panel 10 operates the pressurized water supply device 3.

When the pressurized water supply device 3 is operated, the diaphragm in the foam stock solution tank 14 is pressurized by the pressurized water from the pressurized water supply apparatus 3, and the foam stock solution tank 14 supplies the foam extinguishing agent to the mixer 15. . The mixer 15 mixes the pressurized water from the pressurized water supply device 3 with the foam extinguishing agent from the foam stock solution tank 14, and mixes the mixed solution through the automatic alarm valve 5 and the simultaneous opening valve 12 to the foam head 1.
Pump to 1. The foam head 11 foams and discharges the mixed liquid. The automatic alarm valve 5 detects the flow of the mixed liquid and outputs an alarm.

A check valve 16 is provided in the main water supply pipe 6 upstream of the mixer 15 to prevent the mixed liquid from flowing back, and the mixed liquid also flows into the foamed liquid supply pipe 17 connected to the mixer 15. A check valve 18 for preventing the above is provided. In summer or the like, the pressure in the water supply pipe 7 between the automatic alarm valve 5 and the simultaneous opening valve 12 and the water supply main pipe 6 between the mixer 15 and the automatic alarm valve 5 may rise abnormally. . In particular, the pressure of the mixed liquid often rises rapidly.

If the pressure in the water supply pipe 7 rises abnormally,
Water may leak from the simultaneous release valve 12 or components may be damaged. In this foam fire extinguisher, there is no proposal to prevent an abnormal rise in the pressure on the secondary side of the automatic alarm valve 5, but the above-mentioned Jpn.
As shown in Japanese Patent Publication No. 7, it is conceivable that both the inflow and outflow sides of the automatic alarm valve 5 are communicated by a throttle mechanism such as an orifice.

[0012]

However, among such conventional fire extinguishing equipment, the former sprinkler fire extinguishing equipment operates at a flow rate less than one sprinkler head according to the certification standard of the automatic alarm valve. However, it is said that it must operate reliably if the flow rate of one or more sprinkler heads is high.
According to Japanese Patent No. 41717, the flow rate Q flowing to the secondary side of the automatic alarm valve is the sum of the flow rate Q1 flowing to the automatic alarm valve side and the flow rate Q2 flowing to the throttle mechanism side. Therefore, the flow rate Q is, for example, 80 liters. Flow rate Q1 on the automatic alarm valve side is Q1 <80 liters /
If it is min, the operation of the automatic alarm valve cannot be guaranteed.

That is, in the former case, since the throttle mechanism is provided, for example, the flow rate Q is 80 liters / min.
If a flow rate Q2 of 20 liters / min bypasses the automatic warning valve, the flow rate Q1 flowing through the automatic warning valve side will be 6
Since it becomes 0 liter / min, the automatic alarm valve does not operate and the performance of the automatic alarm valve cannot be guaranteed.

On the other hand, in the latter foam extinguishing facility, a check valve is provided between the mixer and the pressure tank so that the mixed liquid does not flow back to the pressurized water supply device side and the foaming liquid tank side. Since a check valve is provided between the mixer and the foam stock solution tank, the pressure increase is blocked by the check valve only by providing the throttle mechanism, and the pressure tank cannot absorb the pressure increase. The problem arises.

The present invention has been made in view of the above-mentioned conventional problems, and a valve means for releasing the pressure increase to the primary side is provided in parallel with the automatic alarm valve to absorb the pressure increase and It is an object of the present invention to provide a sprinkler fire extinguishing system that can guarantee the performance of an alarm valve. Another aspect of the present invention is to provide a valve means for releasing the pressure increase to the primary side in parallel with the automatic alarm valve, and an absorbing means for absorbing the pressure increase from the check valve to the automatic alarm valve side. It is an object of the present invention to provide a foam extinguishing system that can guarantee the performance of the above and can sufficiently absorb the pressure rise.

[0016]

In order to achieve the above object, the present invention relates to a fire extinguishing facility for extinguishing a fire by sprinkling water for extinguishing water under pressure by a pressurized water supply device to a water sprinkling means through an automatic alarm valve. It is characterized in that a valve means for releasing a pressure increase on the secondary side of the automatic alarm valve to the primary side and blocking a flow from the primary side to the secondary side is provided in parallel with the automatic alarm valve.

According to another aspect of the present invention, the pressurized water from the pressurized water supply device and the foam extinguishing agent from the foam stock solution tank are mixed in a mixer and supplied to a foam discharging means via an automatic alarm valve to discharge the mixed solution by foaming. In a fire extinguishing facility for extinguishing fires, valve means for releasing a pressure rise on the secondary side of the automatic alarm valve to the primary side and blocking a flow from the primary side to the secondary side is provided in parallel with the automatic alarm valve. An absorption means for absorbing a pressure increase is provided on the automatic alarm valve side of the check valve provided on the primary side of the mixer.

[0018]

According to the fire extinguishing system of the present invention having such a configuration, the valve means for releasing the pressure increase on the secondary side of the automatic alarm valve to the primary side and preventing the flow from the primary side to the secondary side is provided. Since it is installed in parallel with the automatic alarm valve, an abnormal pressure rise on the secondary side of the automatic alarm valve can be released to the primary side and absorbed by the pressure tank when the ambient temperature rises in summer, etc. The flow of pressurized water from the primary side to the secondary side is blocked by the valve means in the event of a fire, and all the components pass through the automatic alarm valve. Therefore, the automatic alarm valve operates reliably. Therefore, the performance of the automatic alarm valve can be guaranteed.

Further, in the case of the foam extinguishing equipment, the valve means for releasing the pressure increase on the secondary side of the automatic alarm valve to the primary side and preventing the flow from the primary side to the secondary side is provided in parallel with the automatic alarm valve. Since the absorbing means for absorbing the pressure increase is provided on the automatic alarm valve side with respect to the check valve, the pressure increase can be reliably absorbed even if the check valve is provided.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a sprinkler fire extinguishing system according to an embodiment of the present invention. In FIG. 1, reference numeral 21 is a fire pump, and the fire pump 21 extends from a fire water tank 22 to a suction pipe 2
3, the fire extinguishing water is sucked, and the sucked fire extinguishing water is pressurized and supplied to the water supply main 26-1 through the check valve 24 and the gate valve 25. The fire pump 21 is driven by a pump motor 27.

The fire extinguishing pump 21 and the pump motor 27 constitute a pressurized water supply device 28 which pressurizes and sends out the fire extinguishing water under pressure. The pump motor 27 is started and stopped by the fire pump control panel 29. A water supply pipe 30 is branched from the middle of the water supply main pipe 26-2, and an automatic alarm valve 31 which is a running water detection device is connected to the middle of the water supply pipe 30.

A pressure tank 32 is branched and connected to the secondary side of the sluice valve 25 of the water supply main 26-1.
The pipe internal pressure of -1 is always kept constant.
For example, the pressure tank 32 absorbs a pressure increase due to an increase in ambient temperature. At the bottom of the pressure tank 32, a water supply main pipe 26 is provided via a manual valve 33 that is always open.
The pressurized water is introduced through the pipe 34.

The pressure tank 32 has a pressure switch 3
5, the pressure switch 35 is turned off when the pressure of the compressed air in the pressure tank 32 exceeds the specified pressure,
It turns on when the pressure drops below the specified pressure. The switch output of the pressure switch 35 is given to the fire-extinguishing pump control panel 29. When the compressed air in the pressure tank 32 falls below the specified pressure, a detection signal is sent to the fire-extinguishing pump control panel 29, and The pressurized water supply device 28 is operated.

A priming tank 36 is installed near the fire pump 21 at a predetermined height, and a priming water supply pipe 37 is connected from the priming tank 36 to the discharge side of the fire pump 21. This water tank 36 is provided with a water level sensor 38, and the water level sensor 38 has an upper limit electrode 39, a lower limit electrode 41, and a common electrode 40. The output of the water level sensor 38 is given to the fire extinguishing pump control panel 29, and the fire extinguishing pump control panel 29 issues a full water alarm (upper limit alarm) and a water decrease alarm (lower limit alarm).

On the discharge side of the fire extinguishing pump 21, a test pipe 42 for flowing a rated flow in the pump performance test is branched and connected, and the end of the test pipe 42 is inserted into the fire extinguishing water tank 22. Reference numeral 43 is a flow rate detector. Further, the pump control board 29 is connected to the self-warning warning board 44 and gives the self-warning warning board 44 with an operating state of the fire extinguishing pump 21, a water level alarm of the water tank 36, and the like.

An end testing device 45 is provided at the end of the water supply pipe 30.
Is provided. The terminal test device 45 has a pressure gauge 46, a drain valve 47, and an orifice 48 that allows a flow rate corresponding to the operation of one sprinkler head. A plurality of sprinkler heads 49 as water sprinkling means are provided in the water supply pipe 30 and have a built-in thermal fuse or the like which is melted by heat.

Here, a check valve 50 as a valve means is provided in parallel with the automatic alarm valve 31, and the check valve 50 automatically alarms a pressure increase in the water supply pipe 30 on the secondary side of the automatic alarm valve 31. The water is allowed to escape to the main water supply pipe 26-2 on the primary side of the valve 31. That is, the check valve 50 prevents an abnormal pressure rise in the water supply pipe 30 due to a temperature rise in the summer, etc.
Escape to 2. The pressure increase in the water supply main 26-2 is absorbed by the pressure tank 32.

Therefore, the pressure in the water supply pipe 20 can be prevented from rising abnormally, and water leakage from the sprinkler head 49 or damage to other components can be prevented in advance. Further, when a fire occurs, pressurized water from the pressurized water supply device 28 is supplied to the sprinkler head 49 through the automatic warning valve 31, but since the check valve 50 is provided in parallel with the automatic warning valve 31, the check valve is provided. Since the flow rate Q2 of 50 is zero and the total flow rate Q and the flow rate Q1 of the automatic alarm valve 31 are equal, the flow rate Q is a predetermined flow rate, that is,
If the flow rate is one sprinkler head or more, the automatic alarm valve 31 operates reliably. Therefore, the performance of the automatic alarm valve 31 can be guaranteed.

Next, FIG. 2 is a diagram showing another embodiment of the present invention. The same components as those in the above embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In FIG.
Reference numeral 51 denotes a foam stock solution tank, and a diaphragm (not shown) is housed in the foam stock solution tank 51, and a foam extinguishing agent is always stored in the diaphragm. As the foam extinguishing agent, usually, a water film-forming foam extinguishing agent is often used, and the water film-forming foam extinguishing agent is based on a synthetic surfactant to which a fluorinated surfactant is added. When the foam extinguishes, it produces a water film on the oil surface.

Pressurized water in the main water supply pipe 26-1 is introduced into the upper part of the foam stock solution tank 51 through a sluice valve 52 which is normally open, and a pipe 53 pressurizes the diaphragm. 54
Is a mixer connected to the main water supply pipe 26-2, and a stock solution supply pipe 55 is connected between the mixer 54 and the foam stock solution tank 51. The diaphragm in the foam stock solution tank 51 is pressurized by the pressurized water from the water supply main pipe 26-1, and the foam extinguishing agent in the diaphragm is supplied to the mixer 54 via the check valve 56 and the partition valve 57 of the stock solution supply pipe 55. Supplied. The check valve 56 is provided in order to prevent the mixed liquid mixed in the mixer 54 from flowing back into the foam stock solution tank 51.

A check valve 58 and a sluice valve 59 are also provided in the main water supply pipe 26 near the mixer 54, and the check valve 58 allows the mixed liquid to contain the pressure tank 32, the pressurized water supply device 28, and the like. To prevent backflow. The mixer 54 is a foam solution tank 51.
The foam extinguishing agent supplied from the above and the pressurized water from the water supply main pipe 26-1 pressurized by the pressurized water supply device 28 are proportionally mixed within the range of the flow rate used, for example, to prepare a mixed solution of 3% or 6%, It is sent to a foam head 60 as a foam discharging means.

From the middle of the water supply main 26-2, the water supply pipe 3
0 is branched and connected, and the water supply pipe 30 is provided with an automatic alarm valve 31 which is a flowing water detection device. Also, the water supply pipe 3
A branch pipe 61 is branched from 0, and a simultaneous opening valve 62 is connected to each branch pipe 61. A pipe 63 is connected to the simultaneous opening valve 62, a foam head 60 as a foam discharging means is connected to the pipe 63, a pipe 64 is branched and connected to the simultaneous opening valve 62, and a sensing head 65 is connected to the pipe 64.
Are connected.

The foam head 60 is composed of, for example, a foam head, and the mixed liquid sent to the nozzle port thereof is ejected from the nozzle port and foams when passing through a deflector or a wire net while sucking air around the nozzle port, and the floor Emitted to the surface. When the sensing head 65 senses heat from a fire, it operates to open the simultaneous open valve 62. When the simultaneous opening valve 62 is opened, the mixed liquid is foamed and discharged from the foam head 60.

Reference numeral 66 is a manual start valve provided at the end of the pipe 64. When the manual start valve 66 is started, the simultaneous open valve 62 is opened. Here, a check valve 50 as a valve means is provided in parallel with the automatic alarm valve 31, and the check valve 50 automatically increases the pressure in the water supply pipe 30 and the branch pipe 61 on the secondary side of the automatic alarm valve 31. The alarm valve 31 is allowed to escape to the water supply main pipe 26-2 on the primary side.

When a fire occurs, the mixed liquid mixed in the mixer 54 is supplied to the foam head 60 through the automatic alarm valve 31, and the check valve 50 is provided in parallel with the automatic alarm valve 31. Therefore, since the flow rate Q2 of the check valve 50 is zero and the total flow rate Q and the flow rate Q1 of the automatic alarm valve 31 are equal,
If the flow rate Q is a predetermined flow rate, that is, a flow rate for one sprinkler head or more, the automatic alarm valve 31 operates reliably. Therefore, the performance of the automatic alarm valve 31 can be guaranteed.

However, in the case of the foam extinguishing equipment, the check valve 58 is provided in the water supply main pipe 26 upstream of the mixer 54, and the foam stock solution supply pipe 55 connected to the mixer 54 is also reversed. Since the stop valve 56 is provided, the pressure increase released by the check valve 50 cannot be absorbed. In order to absorb this, the water supply main pipe 26-2 between the check valves 58 and 56 and the automatic alarm valve 31 is provided with a tank 68 for absorbing pressure rise as an absorbing means via a sluice valve 67.

Therefore, since the pressure increase due to the temperature increase in summer etc. can be absorbed by the tank 68, it is possible to prevent water leakage from the simultaneous opening valve 62 and damage to other components. Although the check valve 50 is connected to the outlet of the pressure gauge of the automatic alarm valve 31 in the above embodiment, the check valve 50 may be connected at any place as long as it is provided in parallel with the automatic alarm valve 31.

Further, an electric valve is provided in parallel with the automatic alarm valve 31, a pressure sensor is provided on the secondary side of the automatic alarm valve 31, and the electric valve is activated only when the pressure detected by the pressure sensor exceeds a predetermined value. A pressure control device may be provided to prevent the pressure from rising.

[0039]

As described above, according to the present invention, the pressure increase on the secondary side of the automatic alarm valve is released to the primary side,
Since the valve means for blocking the flow from the primary side to the secondary side is provided in parallel with the automatic alarm valve, it is possible to prevent the pressure increase on the secondary side, prevent water leakage from the sprinkling means, and prevent The securing can be prevented in advance, and since all the flow rate passes through the automatic alarm valve when a fire occurs, the automatic alarm valve can be operated reliably and the performance of the automatic alarm valve can be guaranteed.

Further, in the case of the foam extinguishing equipment, since the valve means as described above is provided in parallel with the automatic alarm valve, and the absorbing means for absorbing the pressure increase is provided between the check valve and the automatic alarm valve. Even if the check valve is provided, the pressure increase can be reliably absorbed.

[Brief description of drawings]

FIG. 1 is a diagram showing a sprinkler fire extinguishing system according to an embodiment of the present invention.

FIG. 2 is a view showing a foam extinguishing facility according to another embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

FIG. 4 is a diagram showing another conventional example.

[Explanation of symbols]

 21: Fire extinguishing pump 22: Fire extinguishing water tank 23: Suction pipe 24: Check valve 25: Gate valve 26-1, 26-2: Water supply main 27: Pump motor 28: Pressurized water supply device 29: Fire extinguishing pump control panel 30: Water supply pipe 31: Automatic alarm valve 32: Pressure tank 33: Manual valve 34: Piping 35: Pressure switch 36: Water tank 37: Water supply pipe 38: Water level sensor 39: Upper limit electrode 40: Lower limit electrode 41: Common electrode 42: Test piping 43: Flow rate detector 44: Auto-fire alarm board 45: Terminal test device 46: Pressure gauge 47: Drain valve 48: Orifice 49: Sprinkler head (sprinkling means) 50: Check valve (valve means) 51: Foam stock solution Tank 52: Gate valve 53: Pipe 54: Mixer 55: Stock solution supply pipe 56: Check valve 57: Gate valve 58: Check valve 59: Gate valve 60: Foam head (foam discharging means) 61: Branch pipe 62: Simultaneous opening valve 63, 64: Piping 65: Sensing head 66: Manual start valve 67: Gate valve 68: Tank (absorbing means)

Claims (2)

[Claims] 1. In a fire extinguishing facility for extinguishing fire by sprinkling water for extinguishing water by a pressurized water supply device through an automatic alarm valve to a sprinkling means, releasing a pressure rise on the secondary side of the automatic alarm valve to the primary side,
Fire extinguishing equipment, characterized in that valve means for blocking the flow from the primary side to the secondary side is provided in parallel with the automatic alarm valve. 2. Pressurized water from a pressurized water supply device and a foam extinguishing agent from a foam stock solution tank are mixed in a mixer and supplied to a foam discharging means via an automatic alarm valve to foam and discharge the mixed liquid to extinguish a fire. In a fire extinguisher, the pressure rise on the secondary side of the automatic alarm valve is released to the primary side,
A valve means for blocking the flow from the primary side to the secondary side is provided in parallel with the automatic alarm valve, and an absorption for absorbing a pressure increase from the check valve provided on the primary side of the mixer to the automatic alarm valve side. Fire extinguishing equipment characterized by having means.