JP2012105920A - Negative pressure wet sprinkler system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide negative pressure wet pre-action type sprinkler systems which can obtain a prescribed supervisory pressure even in low stories.SOLUTION: In the negative pressure wet pre-action type sprinkler systems, a check valve 16 is provided in the end of a drain pipe 13 to prevent water in a water storage tank 7 from flowing in the drain pipe 13 side, a water level detector 17 is provided in the drain pipe 13 in a position lower than a suction branch pipe 12a(P) of the lowermost story, a drain pump 18 is provided which can drain water inside the drain pipe 13 below the water level detector 17, the drain pump 18 is operated/stopped in accordance with a signal from the water level detector 17, so that the water level in the drain pipe 13 is maintained at a side lower than the suction branch pipe 12a(P) of the lowermost story. As a result, the supervisory pressure can be made comparable with one in upper stories in the negative pressure wet pre-action type sprinkler systems provided in the lowermost story.

Description

  The present invention relates to a negative pressure wet sprinkler facility capable of obtaining a predetermined monitoring pressure even at a lower floor.

  In recent years, negative pressure wet pre-actuated sprinkler equipment has been installed in some properties. This negative pressure wet pre-acting sprinkler equipment is filled with water in the secondary side piping of the pre-acting valve, and when the secondary side piping is constantly negative pressure, the sprinkler head is damaged, etc. It has functions to prevent accidental water discharge and to discharge water promptly in case of fire.

5 and 6 are schematic explanatory views showing an example of the above-described conventional negative pressure wet pre-actuated sprinkler equipment.
5 and 6, a negative pressure wet pre-actuated sprinkler facility 101 includes a sprinkler head 102 installed on each floor in accordance with installation standards, a primary side pipe 103 serving as a fire extinguishing water main pipe, and a sprinkler head 102 on each floor. A water supply pipe 105 composed of a secondary side pipe 104 that guides water, a negative pressure wet pre-actuated valve 106 provided between the primary side pipe 103 and the secondary side pipe 104, and a water in a water tank 107 A pressurized water feeding device 108 that feeds into the primary side pipe 103 of the water supply pipe 105 under pressure, a fire detector 109 that detects a fire earlier than the sprinkler head 102 and outputs a fire signal, and a fire signal from the fire detector 109 The control unit 110 that controls the opening and closing of the pressurized water supply device 108 and the negative pressure wet pre-actuating valve 106 based on the And a negative pressure ensuring means 111. to maintain state.

More specifically, the sprinkler heads 102 operate independently of each other.
The water supply pipe 105 includes a primary side pipe 103 connected to the pressurized water supply device 108, a secondary side pipe 104 connected to each sprinkler head 102, and a negative pressure between the primary side pipe 103 and the secondary side pipe 104. This is a piping system that communicates with the wet pre-actuating valve 106 and guides fire-extinguishing water from the pressurized water supply device 108.

  The fire detector 109 is a sensor that is installed on the same floor as the sprinkler head 102, detects a fire earlier than the sprinkler head 102, and outputs a fire signal.

  The negative pressure state securing means 111 connects one end side of the suction branch pipe 112a to the rising branch pipe 104a of the secondary side pipe 104 on each floor, and communicates the other end side of the suction branch pipe 112a to the drain pipe 113. One end of the drain pipe 113 is communicated with the vacuum pump 115 via the air / water separator 114 and the suction main pipe 112 in this order, the other end of the drain pipe 113 is opened in the water of the water storage tank 107, and The separation device 114 is provided above the suction branch pipe 112a on the uppermost floor, and the vacuum switch 116 and the electromagnetic valve 117 are arranged in this order from the start branch pipe 104a to the suction branch pipe 112a. The inside of the side pipe 104 can be maintained in a negative pressure state.

Further, a terminal test device 118 is provided at the end of the secondary side pipe 104.
The fire detector 109 is connected to the disaster prevention receiving board 120 by a signal line (not shown). The disaster prevention receiving board 120 is connected to the control unit 110 by a signal line (not shown). When the fire signal detected by the fire detector 109 is received by the disaster prevention reception board 120 via a signal line (not shown), the disaster prevention reception board 120 performs a predetermined reception process and transmits the signal via a signal line (not shown). It is sent to the control unit 110. The control unit 110 is connected to the negative pressure wet pre-actuating valve 106 by a signal line (not shown).

  In addition, when the symbol of the valve displayed in each figure in the drawings is painted black, it indicates that the valve is closed, and when not painted, it indicates that the valve is open. .

  In the negative pressure wet pre-acting sprinkler equipment 101, the primary side pipe 103 is normally filled with pressurized water, and the secondary side pipe 104 is filled with negative pressure water. .

  The vacuum switch 116 is connected to the control unit 110 via a signal line (not shown), and the control unit 110 is connected to the electromagnetic valve 117 via a signal line (not shown). When the vacuum switch 116 detects a pressure increase, a detection signal is given to the control unit 110. The controller 110 opens the electromagnetic valve 117 based on the signal.

[Operation when a fire occurs]
When a fire occurs, the fire detector 109 immediately above or near the fire occurrence part detects the fire and generates a fire signal. This fire signal is sent to the control unit 110 via the disaster prevention receiving board 120. The controller 110 opens the negative pressure wet pre-actuating valve 106 and activates the pressurized water supply device 108. As a result, fire-extinguishing water is pumped to the sprinkler head 102 via the primary side pipe 103, the negative pressure wet pre-actuating valve 106, and the secondary side pipe 104, and the secondary side pipe 104 is pressurized from the negative pressure state. The state changes, and water for fire extinguishing is sprayed from the sprinkler head 102. Thereby, a fire can be prevented to the minimum.

[Operation during accidental water discharge]
When the sprinkler head 102 is damaged, air flows from the opening of the sprinkler head 102, and the pressure in the secondary side pipe 104 increases. When this is detected, the vacuum switch 116 sends a detection signal to the control unit 110. The control unit 110 opens the electromagnetic valve 117 based on the detection signal. And the inside of the secondary side piping 104 to which the said failure sprinkler head 102 is connected is continuously sucked by the operation of the vacuum pump 115. Thereby, the water discharge from the sprinkler head 102 can be prevented.

  In the steam-water separator 114, the air and the separated water are drained to the water storage tank 107 via the drain pipe 113, but the inside of the drain pipe 113 is in a negative pressure state, so as shown in FIG. Further, the water is pulled up to a height corresponding to the suction force of the vacuum pump 115, and the water exceeding the height is collected in the drain pipe 113. At this time, a water head pressure corresponding to the height is generated in each part of the drain pipe 113.

  For example, when the suction pressure of the vacuum pump 115 is −0.08 [MPa], the water is pulled up to a height of about 8 [m] from the water surface of the water storage tank. WL indicates the water level. When the vacuum switch 116 is installed at a position 5 [m] lower than the water level WL of the drain pipe 113 in such a state, a water head pressure of 5 [m] is generated in the vicinity of the vacuum switch 116. Even if the monitoring pressure of the vacuum switch 116 installed on the upper floor above the water level WL in the pipe was -0.08 [MPa], it was installed on the lower floor than the water level in the drain pipe 113. In the vacuum switch 116, the monitoring pressure is only -0.03 [MPa].

  In addition, in the water supply pipe 105 to the building, since there are building beams, air conditioning equipment ducts, etc., the secondary side pipe 104 is folded in a U-shape on the lower side so as to bypass these. In such a case, air accumulates in the bent portion, thereby generating water head pressure. Therefore, the monitoring pressure near the sprinkler head 102 located at the end of the secondary side pipe 104 is It rises further.

  As a result, the sprinkler head 102 may be damaged, malfunctioned, or the piping may be damaged, preventing the sprinkler head 102 from preventing erroneous water discharge. For this reason, when the vacuum switch 116 is installed at a lower floor than the water level in the drain pipe 113, it is difficult to dispose the negative pressure wet pre-actuated sprinkler equipment.

   An object of the present invention is to provide a negative-pressure wet pre-actuated sprinkler facility that eliminates the above-described drawbacks of the prior art and can obtain a predetermined monitoring pressure even at a lower floor.

In order to achieve the above object, the invention according to claim 1 comprises a sprinkler head,
A water supply pipe comprising a primary side pipe which is a fire extinguishing water main pipe and a secondary side pipe which guides water for fire extinguishing to the sprinkler head;
A valve provided between the primary side pipe and the secondary side pipe;
A pressurized water supply device that sucks and pressurizes water in the water storage tank and sends it to the primary side pipe of the water supply pipe;
A fire detector that detects a fire earlier than the sprinkler head and outputs a fire signal;
A control unit that controls opening and closing of the pressurized water supply device and the valve unit based on a fire signal from the fire detector;
One end side of the suction branch pipe is connected to the rising part of the secondary side pipe, the other end side of the suction branch pipe is connected to the drain pipe, and one end of the drain pipe is connected to the lower part of the air-water separator, A negative pressure state in which the upper part of the steam separator is connected to the vacuum pump through the suction main pipe, and the suction branch pipe is arranged in the order of the vacuum switch and solenoid valve from the start-up side of the secondary pipe. In the negative-pressure wet sprinkler equipment, which is provided with a securing means, the water in the secondary side pipe is brought into a negative pressure state by the negative pressure state securing means, and this is maintained.
A water level detector is installed in the drain pipe below the suction branch pipe, and a drain pump that can discharge the water in the drain pipe is installed below the water level detector, and the drain pump is operated and stopped according to the signal from the water level detector. It is characterized by providing a means to do.

In the above configuration, the drain pipe is branched above the drain pump, and a check valve is provided at the end of the branch drain pipe.

In order to achieve the above object, the invention according to claim 3 is a sprinkler head,
A water supply pipe comprising a primary side pipe which is a fire extinguishing water main pipe and a secondary side pipe which guides water for fire extinguishing to the sprinkler head;
A valve provided between the primary side pipe and the secondary side pipe;
A pressurized water supply device that sucks and pressurizes water in the water storage tank and sends it to the primary side pipe of the water supply pipe;
A fire detector that detects a fire earlier than the sprinkler head and outputs a fire signal;
A control unit that controls opening and closing of the pressurized water supply device and the valve unit based on a fire signal from the fire detector;
One end side of the suction branch pipe is connected to the rising part of the secondary side pipe, the other end side of the suction branch pipe is connected to the drain pipe, and the side of the secondary side pipe is connected to the suction branch pipe To vacuum switch and solenoid valve
In addition, an air / water separator for separating water and air is provided below the position of the suction branch pipe,
A water level detector for detecting an internal water level is provided in the steam separator.
The other end of the drain pipe communicates with the lower side of the steam separator,
Provide a vacuum pump that sucks air,
The upper part of the steam separator is connected to a vacuum pump via a suction pipe,
A drainage pump for discharging water is installed at the bottom of the steam separator,
A negative pressure wet sprinkler facility comprising a negative pressure state comprising means for operating / stopping a drainage pump according to a signal from a water level detector and a water level securing means.

In the above configuration, the drainage pipe connected to the lower part of the steam / water separator is branched, and a check valve is provided at the end of the branch drainage pipe.

  In the present invention, since water is not collected in the lowermost suction branch pipe in the drainage pipe, the monitoring pressure of the negative pressure wet pre-actuated sprinkler equipment installed in the lowermost layer can be made equal to the upper floor. In addition, it is possible to stably obtain the effect of preventing erroneous water discharge when the sprinkler head malfunctions or the pipe is damaged, which is a feature of the negative pressure wet pre-actuated sprinkler equipment, regardless of the hierarchy.

It is a schematic explanatory drawing in 1st Embodiment of the negative pressure wet sprinkler equipment which concerns on this invention. It is a schematic explanatory drawing in 2nd Embodiment of the negative pressure wet sprinkler equipment which concerns on this invention. It is a schematic explanatory drawing in further another embodiment of the negative pressure wet sprinkler equipment concerning the present invention. It is a schematic explanatory drawing in further another embodiment of the negative pressure wet sprinkler equipment concerning the present invention. It is a schematic explanatory drawing of the conventional negative pressure wet pre-operation type sprinkler equipment. It is a figure for demonstrating the state at the time of vacuum pump operation | movement in the conventional negative pressure wet pre-operation type sprinkler installation.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In FIG. 1, reference numeral 1 denotes a negative pressure wet pre-actuated sprinkler facility. This negative pressure wet pre-actuated sprinkler equipment 1 includes a sprinkler head 2 installed on each floor according to installation standards, a primary side pipe 3 serving as a fire extinguishing water main pipe, and a secondary side for introducing water for fire extinguishing to the sprinkler head 2 on each floor A water supply pipe 5 comprising a pipe 4, a negative pressure wet pre-actuated valve 6 provided between the primary side pipe 3 and the secondary side pipe 4, and water in the water storage tank 7 are sucked and pressurized, and the water supply pipe 5 Pressurized water supply device 8 that feeds into the primary side pipe 3, fire detector 9 that detects a fire earlier than the sprinkler head 2 and outputs a fire signal, and a pressurized water supply device based on the fire signal from the fire detector 9 8 and a control unit 10 for controlling the opening and closing of the negative pressure wet pre-actuating valve 6 and a negative pressure state securing means 11 for maintaining the inside of the secondary side pipe 4 in a negative pressure state.

More specifically, the sprinkler head 2 operates independently of each other.
The water supply pipe 5 includes a primary side pipe 3 connected to the pressurized water supply device 8 and a secondary side pipe 4 connected to each sprinkler head 2, and includes a primary side pipe 3 and a secondary side pipe 4. The negative pressure wet pre-actuating valve 6 communicates with each other so that fire-extinguishing water from the pressurized water supply device 8 can be guided.

The fire detector 9 is a sensor that is installed on the same floor as the sprinkler head 2 and detects a fire earlier than the sprinkler head 2 and outputs a fire signal.
The negative pressure state securing means 11 connects one end side of the suction branch pipe 12a to the rising branch pipe 4a of the secondary side pipe 4 on each floor, and communicates the other end side of the suction branch pipe 12a to the drain pipe 13. One end of the drainage pipe 13 communicates with the lower part of the steam / water separator 14, the upper part of the steam / water separator 14 communicates with the vacuum pump 15 via the suction main pipe 12, and a check valve 16 is provided at the end of the drainage pipe 13. Therefore, water in the water storage tank 7 is prevented from flowing into the drainage pipe 13, a water level detector 17 is provided below the suction branch pipe 12 a on the lowest floor, and the water in the drainage pipe 13 is drained below the water level detector 17. A drainage pump 18 that can be discharged is provided, the discharge pipe 13 a of the drainage pump 18 is extended into the water of the water tank 7, and a check valve 16 is provided at the end 13 b of the drainage pipe 13 so that the water in the water storage tank 7 flows into the drainage pipe 13. So that the suction branch pipe 12 does not flow to the side. , The vacuum switch 20 from the side of the rising branch pipes 4a, becomes arranged in the order of solenoid valve 21, so as to maintain the interior of the secondary pipe 4 in a negative pressure state by the vacuum pump 15.

A terminal test device 22 is provided at the end of the secondary side pipe 4.
The fire detector 9 is connected to the disaster prevention receiving board 25 by a signal line (not shown). The disaster prevention receiving board 25 is connected to the control unit 10 by a signal line (not shown). When the fire signal detected by the fire detector 9 is received by the disaster prevention reception board 25 via a signal line (not shown), the disaster prevention reception board 25 performs a predetermined reception process and transmits the signal via a signal line (not shown). It is sent to the control unit 10. The control unit 10 is connected to the negative pressure wet pre-actuating valve 6 via a signal line (not shown).

  In addition, when the symbol of the valve displayed in each figure in the drawings is painted black, it indicates that the valve is closed, and when not painted, it indicates that the valve is open. . The same shall apply hereinafter.

In this negative pressure wet pre-actuated sprinkler facility 1, the primary side pipe 3 is normally filled with pressurized water, and the secondary side pipe 4 is filled with negative pressure water. Yes.

  The vacuum switch 20 is connected to the control unit 10 via a signal line (not shown), and the control unit 10 is connected to the electromagnetic valve 21 via a signal line (not shown). When the vacuum switch 20 detects an increase in pressure, a detection signal is given to the control unit 10. The control unit 10 opens the electromagnetic valve 21 based on the signal. The secondary side pipe 4 is in communication with the vacuum pump 15 via the suction branch pipe 12a, the drain pipe 13, the steam / water separator 14 and the suction main pipe 12, and the secondary side pipe 4 is operated by the operation of the vacuum pump 15. The inside can be kept in a negative pressure state.

  Further, in the present embodiment, as shown in FIG. 1, a water level detector 17 is provided in the drain pipe 13 below the lowermost suction branch pipe 12 a (reference symbol P), and the drain pipe is further below the water level detector 17. A drainage pump 18 capable of discharging the water in the tank 13 is provided, the discharge pipe 13a of the drainage pump 18 is extended into the water of the water tank 7, and a check valve 16 is provided at the end 13b of the water drain pipe 13, so that the water tank 7 When the water level in the drainage pipe 13 is lowered from the water level detector 17 to a predetermined position by operating the drainage pump 18 when there is water above the water level detector 17. The drainage pump 18 is stopped.

  When suction is performed by the vacuum pump 15 and the secondary side pipe 4 is made negative pressure, excess water flows into the drain pipe 13 and the water level of the drain pipe 13 rises.

When the water level detector 17 detects that the water level in the drain pipe 13 has reached a predetermined level or more, the drain pump 18 is operated to discharge the water in the drain pipe 13.
When the water level detector 17 detects that the water level in the drain pipe 13 has sufficiently decreased, the drain pump 18 is stopped. The drain pump 18 is a pump having a structure in which water does not flow in the direction of the drain pipe 13.

Since the check valve 16 is provided at the end 13b of the drain pipe 13, even if the vacuum pump 15 is operated, water in the water storage tank 7 is not sucked.
Since it is operated in this way, the water level of the drain pipe 13 is lower than the suction branch pipe 12a (reference numeral P) on the lowermost floor, so that it is not affected by the water head pressure even on the lowermost floor and is the same as the upper floor. Can be negative pressure.

  According to the present embodiment, since water does not stay below the lowermost suction branch pipe 12a (symbol P) in the drain pipe 13, the negative pressure wet pre-actuated sprinkler facility installed in the lowermost layer The monitoring pressure can be equivalent to that of the upper floor, and it is possible to stably obtain the error water discharge prevention effect at the time of sprinkler head malfunction or pipe breakage, which is a feature of negative pressure wet pre-actuated sprinkler equipment, regardless of hierarchy. be able to.

  FIG. 2 is a schematic explanatory view of the second embodiment of the negative pressure wet pre-actuated sprinkler facility according to the present invention, and the same components as those in the first embodiment shown in FIG. A description of the same components will be omitted, and only the features will be described.

  In 2nd Embodiment, as shown in FIG. 2, the steam-water separator arrange | positioned in the uppermost part of the drain pipe 13 is abolished. The uppermost part of the drain pipe 13 is directly connected to the suction branch pipe 12a on the uppermost floor.

  In the second embodiment, the steam / water separation tank 30 is disposed below the lowermost suction branch pipe 12a (reference numeral P), and the valve 31 is provided below the steam / water separation tank 30. The water / water separation tank 30 is provided with a water level detector 33 and a vacuum pump 35 for sucking air, which communicates with the drain pipe 13 via the conduit 32 (branch pipe 32). Is connected to a vacuum pump 35 via a suction pipe 36, and a drain pump 37 for discharging water is provided at the bottom of the steam separation tank 30. A discharge pipe 13 a of the drain pump 37 is placed in the water of the water tank 7. And a check valve 38 is provided at the end 13b of the drain pipe 13 so that the water in the water storage tank 7 does not flow into the drain pipe 13 side, and the drain pump 37 is operated in response to a signal from the water level detector 33.・ It is designed to stop.

  By these, the negative pressure state and the water level securing means that can secure the negative pressure and the water level can be configured. The drain pump 37 is a pump having a structure in which water does not flow in the direction of the air / water separation tank 30 and the drain pipe 13.

  That is, when water flows into the steam separation tank 30 and the water level detector 33 detects that the water has reached a predetermined upper position, the drainage pump 37 is operated, and the water level in the steam separation tank 30 reaches a predetermined level. The operation of the drainage pump 37 is stopped when the water level detector 33 detects that it has been lowered to the lower position.

  As a result, even in the lowest floor P, negative pressure can be secured and the water level can be kept constant, so the monitoring pressure of the negative pressure wet pre-actuated sprinkler equipment installed in the lowest floor should be equivalent to the upper floor. In addition, it is possible to stably obtain the effect of preventing erroneous water discharge when the sprinkler head malfunctions or the piping is damaged, which is a feature of the negative pressure wet pre-actuated sprinkler equipment, regardless of the hierarchy.

In the first embodiment, a check valve 16 is provided at the end 13b of the drain pipe 13 as shown in FIG. 1, and in the second embodiment, the drain pipe 13 is provided as shown in FIG. Although the check valve 38 is provided at the end 13b, when the drainage capacity of the drainage pump (18, 37) is large, the end 13b of the drainage pipe 13 and the check valve 16 as shown in FIGS. (38) may be omitted, and the drain pipe 13 may be directly connected to the suction port of the drain pump 18 as shown in FIG. 3, or may be directly connected to the conduit 32 of the steam separator 30 as shown in FIG. Good. Moreover, even when water is drained to the drain pipe 13 due to sprinkler head breakage or other unforeseen circumstances, it is known that the amount of drainage sent to the drain pipe 13 in advance is small on fire extinguishing equipment, and the existing drain pump If sufficient drainage is possible, a direct connection structure as shown in FIGS. 3 and 4 can be used.

DESCRIPTION OF SYMBOLS 1 Negative pressure wet pre-operation type sprinkler equipment 2 Sprinkler head 3 Primary side piping 4 Secondary side piping 5 Water supply piping 6 Negative pressure wet pre-actuation valve 8 Pressurized water supply device 9 Fire detector 10 Control part 11 Negative pressure state ensuring means 12a Suction branch pipe 13 Drain pipe 14 Air / water separation device 15 Vacuum pump 16 Check valve 17 Water level detector 18 Drain pump 19 Terminal test valve 20 Vacuum switch 21 Electromagnetic valve 22 Terminal test device 25 Disaster prevention receiver 30 Air / water separation tank 31 Valve 32 Branch pipe 33 Water level detector 35 Vacuum pump 36 Suction pipe 37 Drain pump 38 Check valve

Claims (4)

A sprinkler head;
A water supply pipe comprising a primary side pipe which is a fire extinguishing water main pipe and a secondary side pipe which guides water for fire extinguishing to the sprinkler head;
A valve provided between the primary side pipe and the secondary side pipe;
A pressurized water supply device that sucks and pressurizes water in the water storage tank and sends it to the primary side pipe of the water supply pipe;
A fire detector that detects a fire earlier than the sprinkler head and outputs a fire signal;
A control unit that controls opening and closing of the pressurized water supply device and the valve unit based on a fire signal from the fire detector;
One end side of the suction branch pipe is connected to the rising part of the secondary side pipe, the other end side of the suction branch pipe is connected to the drain pipe, and one end of the drain pipe is connected to the lower part of the air-water separator, A negative pressure state in which the upper part of the steam separator is connected to the vacuum pump through the suction main pipe, and the suction branch pipe is arranged in the order of the vacuum switch and solenoid valve from the start-up side of the secondary pipe. In the negative-pressure wet sprinkler equipment, which is provided with a securing means, the water in the secondary side pipe is brought into a negative pressure state by the negative pressure state securing means, and this is maintained.
A water level detector is installed in the drain pipe below the suction branch pipe, and a drain pump that can discharge the water in the drain pipe is installed below the water level detector, and the drain pump is operated and stopped according to the signal from the water level detector. A negative-pressure wet sprinkler facility characterized in that means is provided.   The negative pressure wet sprinkler system according to claim 1, wherein the drain pipe is branched above the drain pump, and a check valve is provided at an end of the branch drain pipe. A sprinkler head;
A water supply pipe comprising a primary side pipe which is a fire extinguishing water main pipe and a secondary side pipe which guides water for fire extinguishing to the sprinkler head;
A valve provided between the primary side pipe and the secondary side pipe;
A pressurized water supply device that sucks and pressurizes water in the water storage tank and sends it to the primary side pipe of the water supply pipe;
A fire detector that detects a fire earlier than the sprinkler head and outputs a fire signal;
A control unit that controls opening and closing of the pressurized water supply device and the valve unit based on a fire signal from the fire detector;
One end side of the suction branch pipe is connected to the rising part of the secondary side pipe, the other end side of the suction branch pipe is connected to the drain pipe, and the side of the secondary side pipe is connected to the suction branch pipe To vacuum switch and solenoid valve
In addition, an air / water separator for separating water and air is provided below the position of the suction branch pipe,
A water level detector for detecting an internal water level is provided in the steam separator.
The other end of the drain pipe communicates with the lower side of the steam separator,
Provide a vacuum pump that sucks air,
The upper part of the steam separator is connected to a vacuum pump via a suction pipe,
A drainage pump for discharging water is installed at the bottom of the steam separator,
A negative pressure wet sprinkler facility comprising a negative pressure state comprising means for operating / stopping a drainage pump according to a signal from a water level detector and a water level securing means. 4. The negative pressure wet sprinkler system according to claim 3, wherein a drain pipe connected to the lower part of the steam separator is branched, and a check valve is provided at the end of the branch drain pipe.

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