JP5642638B2 - Sprinkler fire extinguishing equipment and control method thereof - Google Patents

Description

  The present invention relates to a sprinkler fire-extinguishing equipment, and more particularly to a pre-acting sprinkler fire-extinguishing equipment in which a secondary pipe of a pre-acting valve is in a negative pressure state.

  2. Description of the Related Art Conventionally, there is a pressurization type pre-actuated sprinkler fire extinguishing equipment in which a secondary side pipe connected to a sprinkler head is filled with compressed gas and a pre-acting valve is provided on the base end side of the secondary side pipe. This equipment is configured to open the pre-actuated valve and fill the secondary piping when the fire detector installed in the same protection zone as the sprinkler head operates.

  In such a pre-operated sprinkler fire extinguishing system, fire extinguishing water is discharged when both the fire detector and the sprinkler head are operated, so that it is difficult for water damage to occur, but after conducting a water flow test at the time of completion, etc. Even if the secondary pipe is drained, water may remain in the falling pipe portion to which the sprinkler head is connected, and water leakage may occur if the sprinkler head is damaged.

  Therefore, a pre-acting sprinkler fire extinguishing equipment has been proposed in which a vacuum pump is connected to the secondary side pipe and the inside of the pipe is set to a negative pressure (see, for example, Patent Document 1). In this negative pressure type pre-actuated sprinkler fire extinguishing equipment, the secondary side pipe becomes negative pressure air instead of compressed gas, so that the above-mentioned water leakage hardly occurs.

Japanese Utility Model Publication No. 6-26292

  However, the conventional negative pressure type pre-acting sprinkler fire extinguishing equipment may be damaged. That is, when the fire detector is activated and the pre-actuating valve opens, the secondary pipe is in a negative pressure state, so the flow rate of water flowing in the pipe exceeds the specified discharge rate. There is a risk that water hammer will occur and the sprinkler fire extinguishing equipment will be damaged. The present invention has been made to solve the above-described problems, and prevents the flow rate of water flowing in the pipe from being excessive due to the negative pressure of the pre-acting valve secondary side pipe. It aims at obtaining the sprinkler fire extinguishing equipment which prevents the damage of the equipment due to the water hammer caused by.

The sprinkler fire extinguishing equipment according to the present invention is provided with a pre-acting valve, a secondary side pipe provided on the secondary side of the pre-acting valve, connected to a sprinkler head, and normally filled with a negative pressure without being filled with water. A pre-actuated sprinkler fire extinguishing system that is connected to the secondary side pipe and normally has a vacuum pump that negatively pressures the inside of the secondary side pipe. It is controlled to be released from a fire extinguishing system control panel that controls the sprinkler fire extinguishing equipment when the water is discharged, and is a negative pressure to prevent an excessive flow rate due to a negative pressure in the secondary side pipe. Provided with a normally closed on-off valve that allows outside air to flow into the secondary side pipe, and the pre-actuated valve opens the on-off valve when the water is discharged, after the secondary side pipe, which is in negative pressure, is brought to atmospheric pressure.予作controlled to open from the extinguishing system control panel Characterized in that it is a valve.

Further, the sprinkler fire extinguishing equipment according to the present invention includes an exhaust means at a terminal portion of the secondary side pipe, and the air in the secondary side pipe pressed by the fire extinguishing water pumped after the pre-actuating valve is opened. It discharges from an exhaust means, It is characterized by the above-mentioned.
The sprinkler fire extinguishing equipment control method according to the present invention includes a pre-acting valve, a secondary side pipe provided on the secondary side of the pre-acting valve, connected to a sprinkler head and not normally filled with water, In a control method of a pre-actuated sprinkler fire extinguishing equipment, which is connected to a secondary side pipe and normally has a vacuum pump for negative pressure in the secondary side pipe, between the secondary side pipe and the outside air and exhaust means to the distal end of the normally closed on-off valve the secondary pipe interposed provided, at the time of water discharge, the on-off valve to prevent over flow attributable to a negative pressure of the secondary side in the pipe opening control to the pre-actuated valve and opening control for the subsequent having flowed outside air to the secondary pipe, then, in order to prevent the delayed time to filled with water the secondary pipe is pumped The air in the secondary pipe pressed by the fire extinguishing water Characterized by discharging the serial exhaust means.

  According to the sprinkler fire extinguishing equipment according to the present invention, according to the configuration described in claims 1 to 5 or the control method described in claim 6, when the water is discharged, the sprinkler fire extinguishing equipment is Since the operating valve is opened, it is possible to prevent an excessive flow rate of fire-extinguishing water due to the negative pressure in the secondary side pipe, and to prevent damage to the water hammer and the equipment due to the excessive flow rate.

1 is a configuration diagram of a sprinkler fire extinguishing facility according to Embodiment 1. FIG. It is a block diagram of the sprinkler fire extinguishing equipment which concerns on Embodiment 2. FIG. FIG. 6 is a configuration diagram of a sprinkler fire extinguishing facility according to Embodiment 3. In Embodiments 1 and 3, air vents explain the operation of discharging the air in the secondary side pipe. It is a figure explaining the operation | movement which an air vent closes in Embodiment 1 and 3. FIG.

[Embodiment 1]
A sprinkler fire extinguishing facility according to Embodiment 1 of the present invention will be described based on FIGS.

  First, the configuration of the sprinkler fire extinguishing equipment will be described with reference to FIG.

  The sprinkler fire extinguishing equipment of the present embodiment includes a sprinkler head 2, a pre-actuating valve 22, a primary side pipe 11, a secondary side pipe 12, a vacuum pipe 14, a vacuum pump 24, a running water shut-off valve 31, a head operation detecting device 46, and a vacuum. It consists of switches 41 and 53 and a pressurized water supply device 21 and the like.

  The protective section 1 is provided with a plurality of sprinkler heads 2. The protective compartment 1 is provided with a fire detector 3 that detects a fire that has occurred in the protective compartment 1. The fire detector 3 is electrically connected to the fire receiver 4, and the fire receiver 4 that has received the fire alarm from the fire detector 3 sends a fire signal to the fire extinguishing system control panel 5. Further, the fire extinguishing system control panel 5 detects, through the relay 51, a remote start valve 22b that is an electric pilot valve that drives the pre-actuating valve 22 and water flow for extinguishing water due to the opening of the pre-acting valve 22. The water flow signal switch 22a, the open valve 47, the vacuum switch 41, the head operation detection device 46, and the on-off valve 37, which will be described later, are electrically connected as detection means, and the fire pump control panel 6 is a pressurized water supply device. 21 is electrically connected. The fire extinguishing system control panel 5 is activated by either the vacuum switch 41 that operates at a predetermined pressure or the head operation detection device 46 that operates when the pressure increase per unit time exceeds a predetermined value. It is determined whether the head 2 is activated.

  The plurality of sprinkler heads 2 are each connected to a falling pipe 13. Each of the falling pipes 13 is connected to a secondary pipe 12 that is not normally filled with water. One end (base end side) of the secondary pipe 12 is connected to one end (secondary side) of the pre-actuating valve 22 that is normally closed and is electrically opened in the event of a fire. ing. The other end (primary side) of the pre-actuating valve 22 is connected to one end of the primary side pipe 11. Further, the other end (base end side) of the primary side pipe 11 is connected to the discharge port of the pressurized water supply device 21.

  On the other hand, the other end of the secondary side pipe 12 is connected to one end of the end test valve 25. A drain pipe 16 is connected to the other end of the terminal test valve 25. Water filled in the secondary side pipe 12 by a water leak test or the like of the sprinkler fire extinguishing equipment is discharged to the outside by opening drain valves (not shown) provided in the end test valve 25 and the pre-actuating valve 22. In a normal monitoring state, the end test valve 25 is in a closed state.

  In addition, one end of a vacuum pipe 14 is connected to the secondary side pipe 12. A vacuum pump 24 is connected to the other end of the vacuum pipe 14, and the secondary side pipe 12 is set to a negative pressure via the vacuum pipe 14 in normal times.

  The vacuum pipe 14 includes a flowing water shut-off valve 31, a vacuum switch 41, and a pressure rise at a predetermined value from the connection side with the secondary side pipe 12 toward the vacuum pump 24 side. The head operation detection device 46 and the orifice 42 that operate as described above are sequentially provided. In order to prevent the water remaining in the falling pipe 13 from leaking when the sprinkler head is broken, negative pressure is applied so that the inside of the secondary side pipe 12 is strongly sucked, or after completion, after a water flow test, etc. In addition, an opening valve 47 that is opened when the time for the negative pressure is shortened is connected in parallel with the orifice 42. A vacuum switch 53 is connected to the vacuum pipe 14 between the orifice 42 and the vacuum pump 24, and the internal pressure of the vacuum pipe 14 is set to a predetermined value or less via a vacuum pump control panel 52. The vacuum pump 24 is controlled.

  Furthermore, the secondary side pipe 12 is provided with an on-off valve 37 interposed between the outside air. The on-off valve 37 is connected to the proximal end side of the secondary side pipe 12, that is, the pre-acting valve 22 side. The on-off valve 37 is not limited to the base end side of the secondary side pipe 12 but may be connected to somewhere in the secondary side pipe 12. However, if the on-off valve 37 is provided on the base end side of the secondary side pipe 12, Since the electric wires can be laid together with the periphery of the pre-acting valve 22 and the vacuum pipe 14 where the concentration of the gas is concentrated, the electric wire laying work is facilitated. Therefore, the opening / closing valve 37 is provided on the base end side of the secondary side pipe 12. desirable.

  The on-off valve 37 is provided in such a direction that the fire-extinguishing water is not discharged from the secondary pipe 12 to the outside air so that the fire-off water is not discharged from the secondary pipe 12 to the outside air from the on-off valve 37 at the time of water discharge. Is connected in series with a check valve 38, which is a check valve.

  Further, an air vent 34 as an exhaust means is provided at the end of the secondary side pipe 12, that is, on the side farthest from the pre-acting valve 22 in the secondary side pipe 12 and not reaching the descending drain pipe 16. Prepare.

  The air vent 34 is in series with a check valve 39 that is a second check valve provided in a direction in which the outside air does not flow so that the outside air does not flow into the secondary pipe 12 via the air vent 34. Connected to.

  Next, an example of the configuration of the air vent 34 will be described with reference to FIGS.

The air vent 34 includes a primary side connection portion 34a and a secondary side connection portion 34b, and can be connected to a pipe, and includes a float chamber 34c therein. A float 34d floating in water is enclosed in the float chamber 34c, and a valve seat 34e, which is an opening communicating with the secondary side connection portion 34b via the flow passage 34f, is provided at the upper portion thereof. In the air vent 34, when the float chamber 34c does not contain water, the primary side connection portion 34a and the secondary side connection portion 34b communicate with each other, and there is a flow of air between the primary side connection portion 34a and the float chamber 34c. When water flows into the float 34d and the float 34d is lifted, the float 34d acts as a valve body for closing the valve seat 34e.
<Operation of sprinkler fire extinguishing equipment>
In the sprinkler fire extinguishing equipment according to the present embodiment, in the normal monitoring state, the secondary side pipe 12 is not filled with water and the inside of the secondary side pipe 12 and the vacuum pipe 14 are large by starting the vacuum pump 24. This is a vacuum pre-actuated sprinkler fire extinguishing system that has a negative pressure lower than atmospheric pressure.

Hereinafter, the operation of the sprinkler fire extinguishing equipment will be described. First, the operation for detecting the operation of the sprinkler head 2 will be described. Next, the fire extinguishing operation of the sprinkler fire extinguishing equipment will be described.
(Sprinkler head operation detection operation)
An operation for detecting the operation of the sprinkler head 2 will be described with reference to FIG.

  As described above, in the normal monitoring state, the secondary side pipe 12 and the vacuum pipe 14 have negative pressure. In these secondary side pipes 12 and vacuum pipes 14, air gradually flows in from the connecting part of the falling pipe 13 and the sprinkler head 2, and the negative pressure in the pipe rises (approaches atmospheric pressure). Come). When the vacuum switch 53 detects that the negative pressure in the secondary side pipe 12 and the vacuum pipe 14 is equal to or higher than a predetermined pressure, the vacuum pump control panel 52 operates the vacuum pump 24 to The negative pressure in the secondary pipe 12 and the vacuum pipe 14 is maintained at a pressure below a certain level. In addition, when the pressure in the secondary side pipe | tube 12 which is a negative pressure rises, there exist a case by the action | operation of the sprinkler head 2 and the case by the air inflow from piping. Here, the pressure increase due to the inflow of air from the pipe is detected by the vacuum switch 53, and the pressure increase due to the operation of the sprinkler head 2 is detected by the head operation detection device 46 or the vacuum switch 41.

  When a fire occurs in the protective section 1 and the sprinkler head 2 is activated (when the water outlet of the sprinkler head 2 is opened), the protective section is formed in the secondary side pipe 12 and the vacuum pipe 14 from the water outlet of the sprinkler head 2. 1 air flows in. Thereby, the pressure in the secondary side piping 12 and the vacuum piping 14 which are negative pressures rises.

  Therefore, in the present embodiment, the pressure in the secondary side pipe 12 and the vacuum pipe 14, which are negative pressure, is detected by the vacuum switch 41 and the vacuum switch 53, and the head operation detection device 46 detects the amount of pressure change per predetermined time. Based on the above, the operation of the sprinkler head 2 is detected. More specifically, when air flows in from a pipe connection part or the like in a normal state, the pressure increase rate in the secondary side pipe 12 and the vacuum pipe 14 which are negative pressures is small. That is, the amount of change per predetermined time in the normal state is small. On the other hand, when the sprinkler head 2 is operated, the pressure increase rate in the secondary side pipe 12 and the vacuum pipe 14 which are negative pressures is larger than that in the normal monitoring state. That is, the amount of pressure change per predetermined time when the sprinkler head 2 operates is larger than that in the normal state. The head operation detection device 46 detects the operation of the sprinkler head 2 based on this difference in the pressure change amount per predetermined time. In other words, the head operation detection device 46 determines that the sprinkler head 2 has been operated when the absolute value of the pressure change amount per predetermined time becomes larger than the predetermined threshold value.

  Here, the reason why the head operation detection device 46 detects the operation of the sprinkler head 2 based on the pressure change amount per predetermined time will be described.

  The conventional sprinkler fire extinguishing equipment has a sprinkler when the pressure in the secondary pipe 12 and the vacuum pipe 14 which are negative pressures is larger than a certain threshold value (when the pressure is closer to the atmospheric pressure than a certain threshold value). It was determined that the head 2 was activated. Also in the present embodiment, it is determined that the sprinkler head 2 is activated even when the vacuum switch 41 has a pressure equal to or higher than a predetermined threshold. However, since the water outlet of the sprinkler head 2 is smaller than the volume in the secondary side pipe 12 and the vacuum pipe 14, and the pressure difference between the pressure in the secondary side pipe 12 and the protection section 1 is small, the sprinkler head Since the amount of air flowing into the secondary side pipe 12 from 2 is small, it takes time to increase the pressure in the secondary side pipe 12 and the vacuum pipe 14 which are negative pressure. For this reason, when the sprinkler head 2 is operated, for example, the vacuum pump 24 is just started, the negative pressure in the secondary side pipe 12 and the vacuum pipe 14 is low, and the pressure difference between the current pressure and a certain threshold is large. In this case, it takes time for the pressure to rise to the threshold value, and the operation detection of the sprinkler head 2 by the vacuum switch 41 is delayed.

On the other hand, in the present embodiment, the absolute value of the amount of change per predetermined time of the pressure in the secondary side pipe 12 and the vacuum pipe 14 that are negative pressure in the head operation detection device 46 is larger than a predetermined threshold value. It is also determined that the sprinkler head 2 has operated. Therefore, the operation of the sprinkler head 2 can be detected at an early stage regardless of the pressure in the secondary side pipe 12 and the vacuum pipe 14 when the sprinkler head 2 is operated. In the present embodiment, when the sprinkler head 2 is operated during the operation of the vacuum pump 24, the pressure of the secondary side pipe 12 does not change and the head operation detection device 46 is prevented from operating. An orifice 42 is provided in the vacuum pipe 14 between the operation detector 46 and the vacuum pump 24.
(Fire fighting operation)
Subsequently, the fire extinguishing operation of the sprinkler fire extinguishing equipment will be described based on FIGS. 1, 4, and 5.

  In the normal state, the pre-actuating valve 22 of the primary side pipe 11 is filled with water, and the secondary side pipe 12 and the vacuum pipe 14 are not filled with water.

  When a fire occurs in the protective zone 1, the fire detector 3 that detects the fire sends a fire signal to the fire receiver 4, and the fire receiver 4 that receives this fire signal sends a fire signal to the fire extinguishing system control panel 5. To do. After that, when the sprinkler head 2 is operated and the pressure of the secondary side pipe 12 is increased, the fire extinguishing system control panel 5 operates the vacuum switch 41 or the head operation detection device via the relay 51. The operation of the sprinkler head 2 is detected based on the pressure change amount per predetermined time 46. When both the fire signal and the operation of the sprinkler head 2 are detected, the fire extinguishing system control panel 5 performs control for discharging water.

  The fire extinguishing system control panel 5 performs control so that the pre-actuating valve 22 is opened after the opening / closing valve 37 is opened at the time of water discharge. That is, the on-off valve 37 is first opened, and the outside air that is atmospheric pressure flows into the secondary-side pipe that is at a negative pressure via the opened on-off valve 37 and the first check valve 38, and the secondary side The pressure in the pipe 12 approaches the atmospheric pressure. Then, the fire extinguishing system control panel 5 opens the pre-actuation valve 22 by opening the remote start valve 22b after opening the on-off valve 37, and supplies (fills) fire-extinguishing water to the secondary side pipe 12.

  After the pre-actuating valve 22 is opened, the pressure in the primary side pipe 11 is reduced accordingly. The fire detection pump control panel 6 that has received the pressure drop signal from the pressure detection means detects this pressure drop and starts the pressurized water supply device 21, and the secondary pressure whose internal pressure has approached atmospheric pressure. Fire extinguishing water is pumped toward the side pipe 12. When the pre-actuating valve 22 is opened, the running water signal switch 22 a provided in the pre-acting valve 22 transmits a running water signal to the fire extinguishing system control panel 5 via the relay 51.

  The first check valve 38 is closed by the pressure of the fire-extinguishing water pumped through the secondary side pipe 12, and the fire-extinguishing water is not discharged from the opened on-off valve 37. The fire-fighting water that travels in the secondary pipe 12 has an excessive flow rate due to the negative pressure in the secondary pipe 12 because the secondary pipe 12 is at atmospheric pressure or atmospheric pressure close to atmospheric pressure. Therefore, it is possible to prevent water hammer caused by this excessive flow rate.

  Further, the air in the secondary side pipe 12 pressed by the fire-extinguishing water pumped through the secondary side pipe 12 is exhausted at the end of the secondary side pipe 12 until the air vent 34 is filled. Are discharged through the air vent 34 and the second check valve 39 (see FIG. 4). Therefore, since the fire-extinguishing water travels through the secondary side pipe 12 without being blocked by the outside air flowing into the secondary side pipe 12, it prevents the time for filling the secondary side pipe 12 from being delayed.

  Then, when the secondary side pipe 12 is filled with fire-extinguishing water and reaches the air vent 34 at the end thereof to fill the internal float chamber 34c, the float 34d rises and abuts the valve seat 34e to close the valve. However, the fire-extinguishing water is not discharged to the outside through the air vent 34 and the check valve 39 (see FIG. 5). Then, the fire-extinguishing water in the secondary side pipe 12 that has reached the specified pressure is discharged from the activated sprinkler head 2 to the protection section 1 through the falling pipe 13 to the protection section 1 at the specified discharge pressure. Extinguish the fire.

In the present embodiment, the running water shut-off valve 31 is controlled to be closed by the pressure increase in the secondary side pipe 12. For this reason, even if the pre-actuating valve 22 is opened and water is supplied to the secondary side pipe 12, it is possible to prevent water from flowing into the vacuum pipe 14 downstream from the flowing water shutoff valve 31. That is, water can be prevented from flowing into the vacuum pump 24. Therefore, it is possible to prevent the vacuum pump 24 from sucking water and stopping due to overload or causing a failure .

[Embodiment 2]
A sprinkler fire extinguishing facility according to Embodiment 2 of the present invention will be described with reference to FIG. In FIG. 2, the same parts as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The sprinkler fire extinguishing equipment according to the second embodiment differs from the first embodiment in that the on-off valve 37 connected to the base end side of the secondary side pipe 12 and the check valve 38 that is the first check valve. And the air vent 34 as the exhaust means provided at the end of the secondary side pipe 12 and the check valve 39 as the second check valve are abolished. Instead, one end is the end of the secondary side pipe 12. In other words, a normally closed on-off valve 36 is interposed between the drain pipe 16 and the secondary pipe 12 that are connected to the other end and open to the atmosphere at the other end.

  At the time of water discharge, the pre-actuating valve 22 is opened after the opening / closing valve 36 is opened, and then the opening / closing valve 36 has a predetermined time until the fire-extinguishing water pumped through the secondary side pipe 12 reaches the opening / closing valve 36. It is controlled so that it is opened for a time and then closed.

  That is, the fire extinguishing system control panel 5 performs control so that the pre-actuating valve 22 is opened after the opening / closing valve 36 is opened at the time of water discharge. First, the on-off valve 36 is opened, and the atmospheric pressure outside air enters the secondary side pipe 12 through the open-off valve 36 and the drain pipe 16 having a drain port opened to the atmosphere. Inflowing, the pressure in the secondary side pipe 12 approaches the atmospheric pressure. And since the fire extinguishing system control panel 5 opens the pre-actuation valve 22 by opening the remote start valve 22b after opening the on-off valve 36, and supplies (fills) fire-extinguishing water to the secondary side pipe 12. is there.

  Further, the air in the secondary side pipe 12 that is pressed by the fire-extinguishing water that is pumped through the secondary side pipe 12 is provided at the end of the secondary side pipe 12, as well as an on-off valve 36 that also serves as an exhaust means and drainage. It is discharged through the pipe 16. Therefore, since the fire-extinguishing water travels through the secondary side pipe 12 without being blocked by the outside air flowing into the secondary side pipe 12, it prevents the time for filling the secondary side pipe 12 from being delayed. The on-off valve 36 is controlled to be opened for a predetermined time until the fire-fighting water pumped through the secondary side pipe 12 reaches the on-off valve 36 and then closed.

  The predetermined time until the fire-extinguishing water reaches the on-off valve 36 is, for example, when the pre-actuating valve 22 is opened and at the same time, a timing means (not shown) provided in the fire-extinguishing system control panel 5 starts timing, The on-off valve 36 is controlled to be closed when the time measuring means measures a predetermined time until the fire-fighting water pumped in reaches the on-off valve 36. The predetermined time can be calculated from the volume of the secondary side pipe 12 and the amount of water supplied by the pressurized water supply device 21. Moreover, it is good also by actually measuring the time until water for fire extinguishing arrives at the on-off valve 36. In this way, the time for opening the on-off valve 36 is appropriately determined according to the actual equipment. Further, a water detection sensor (not shown) may be provided at the end of the secondary side pipe 12 without depending on the time measuring means, and the on / off valve 36 may be controlled to be closed by the operation of the water detection sensor.

Even if the pre-actuating valve 22 is opened and the fire-fighting water passes through the secondary side pipe 12 and reaches its end, the fire-fighting water is not supplied to the on-off valve 36 and the drain pipe 16 even if the on-off valve 36 cannot be closed in time. After that, by closing the on-off valve 36, the fire-extinguishing water in the secondary side pipe 12 reaches the specified pressure, and from the activated sprinkler head 2 via the falling pipe 13 The fire can be extinguished in the protective section 1 by discharging water into the protective section 1 with the specified discharge pressure.
[Embodiment 3]
A sprinkler fire extinguishing facility according to Embodiment 3 of the present invention will be described with reference to FIGS. 3, 4, and 5, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The sprinkler fire extinguishing equipment according to the third embodiment differs from the first embodiment in that the on-off valve 37, the first check valve 38, and the secondary side connected to the base end side of the secondary pipe 12 The air vent 34 as the exhaust means and the check valve 39 which is the second check valve provided at the end of the pipe 12 are eliminated, and instead the air vent as the exhaust means is provided at the end of the secondary pipe 12. 34 and a normally closed on-off valve 35 connected in series with the air vent 34 and having one end opened to the atmosphere.

  At the time of water discharge, the pre-actuating valve 22 is controlled to be opened after the opening / closing valve 35 is opened. That is, the fire extinguishing system control panel 5 performs control so that the pre-actuating valve 22 is opened after the opening / closing valve 35 is opened at the time of water discharge. First, when the on-off valve 35 is opened, the outside air flows into the secondary side connection portion 34b of the air vent 34 and the float chamber 34c through the opened on-off valve 35. The air vent 34 is designed so that when the float chamber 34c is not filled with water, the float 34d is lifted and does not close, and the air vent 34 has air between the secondary side connection part 34b and the primary side connection part 34a. Therefore, the outside air at atmospheric pressure flows into the secondary side pipe 12, and the pressure in the secondary side pipe 12 approaches the atmospheric pressure. And the fire extinguishing system control panel 5 opens the pre-actuation valve 22 by opening the remote start valve 22b after opening the on-off valve 35, and supplies (fills) fire-extinguishing water to the secondary side pipe 12. is there.

  Further, the air in the secondary side pipe 12 that is pressed by the fire-extinguishing water pumped through the secondary side pipe 12 is discharged through an air vent 34 provided at the end of the secondary side pipe 12 (FIG. 4). reference). Therefore, since the fire-extinguishing water travels through the secondary side pipe 12 without being blocked by the outside air flowing into the secondary side pipe 12, it prevents the time for filling the secondary side pipe 12 from being delayed.

  When the fire extinguishing water pumped through the secondary side pipe 12 reaches the air vent 34, the air vent 34 is closed (see FIG. 5), the fire extinguishing water in the secondary side pipe 12 reaches the specified pressure, and the falling pipe 13 Thus, it is possible to discharge water from the activated sprinkler head 2 to the protection section 1 at a specified discharge pressure and extinguish a fire generated in the protection section 1.

  Although the present invention has been described above in the case of a sprinkler fire extinguishing system in which the fire detector 3 senses a fire and controls the opening of the pre-actuating valve 22 by detecting the operation of the sprinkler head 2, The present invention may be applied to a sprinkler fire extinguishing equipment that controls to open the preactuating valve 22 when the fire detector 3 senses a fire, such as a typical preacting sprinkler fire extinguishing equipment.

1 Protective area, 2 Sprinkler head, 3 Fire detector,
4 Fire receiver, 5 Fire extinguishing system control panel, 6 Fire extinguishing pump control panel,
10 fire extinguishing water tank, 11 primary side piping, 12 secondary side piping,
13 Falling piping, 14 Vacuum piping, 16 Drainage piping,
21 Pressurized water supply device, 22 Pre-actuating valve, 22a Flow signal switch,
22b Remote start valve, 24 vacuum pump, 25 end test valve,
31 Flow-off valve, 34 Air vent, 35, 36, 37 On-off valve,
38, 39 Check valve, 41 Vacuum switch, 42 Orifice,
46 head operation detection device, 47 release valve, 51 repeater,
52 Vacuum pump control panel, 53 Vacuum switch

Claims (6)

A pre-acting valve, provided on the secondary side of the pre-acting valve, connected to a sprinkler head, connected to a secondary side pipe that is not charged normally and has a negative pressure inside, and the secondary side pipe In a pre-actuated sprinkler fire extinguishing equipment comprising a vacuum pump for negative pressure in the secondary side pipe during normal operation,
The secondary side pipe is interposed between outside air and is controlled to be released from a fire extinguishing system control panel that controls the sprinkler fire extinguishing equipment when water is discharged , resulting from negative pressure in the secondary side pipe. In order to prevent overflow, it has a normally closed on-off valve that allows outside air to flow into the secondary pipe that is under negative pressure,
The pre-actuated valve is a pre-actuated valve that is controlled so as to be opened from the fire extinguishing system control panel after opening the on-off valve and setting the secondary side pipe, which is a negative pressure, to atmospheric pressure at the time of water discharge. Sprinkler fire extinguishing equipment characterized by that.   An exhaust means is provided at an end portion of the secondary side pipe, and air in the secondary side pipe pressed by fire-extinguishing water pumped after the pre-actuating valve is opened is exhausted from the exhaust means. Item 1. A sprinkler facility according to item 1.   The on-off valve is connected in series with a first check valve provided in a direction in which fire-extinguishing water is not discharged from the secondary side pipe to the outside air side, and is connected to a base end side of the secondary side pipe, The sprinkler fire extinguishing equipment according to claim 2, wherein the exhaust means is an air vent connected in series with a second check valve provided in a direction in which outside air does not flow. One end is connected to the end of the secondary side pipe and the other end, which is a drain port, is provided so that the on-off valve is interposed between the drain pipe and the secondary side pipe open to the atmosphere,
At the time of water discharge, the pre-actuating valve is opened after the opening / closing valve is opened, and then the opening / closing valve is a predetermined time until the fire-extinguishing water pumped through the secondary side pipe reaches the opening / closing valve. 3. The sprinkler fire extinguishing equipment according to claim 2, wherein the sprinkler fire extinguishing equipment is controlled so as to be opened only and then closed, and also serves as the exhaust means. The sprinkler fire extinguishing equipment according to claim 2, wherein the exhaust means is an air vent provided at an end portion of the secondary pipe, and the on-off valve is connected in series with the air vent. A pre-acting valve, a secondary side pipe provided on the secondary side of the pre-acting valve, connected to a sprinkler head and not normally filled with water, and connected to the secondary side pipe and normally connected to the secondary side In a control method of a pre-actuated sprinkler fire extinguishing equipment comprising a vacuum pump for negative pressure inside the side pipe,
A normally-closed on-off valve interposed between the secondary side pipe and the outside air and an exhaust means are provided at the end of the secondary side pipe, and at the time of water discharge, excess pressure caused by negative pressure in the secondary side pipe is provided. In order to prevent the flow rate, the opening / closing valve is controlled to open and the pre-actuating valve is controlled to open after the external air has flowed into the secondary pipe, and then the time for filling the secondary pipe is filled. A control method for a sprinkler fire extinguishing equipment, characterized in that, in order to prevent a delay , air in the secondary side pipe pressed by fire-fed fire extinguishing water is discharged from the exhaust means.