JP2012196385A - Sprinkler fire-extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain sprinkler fire-extinguishing equipment that prevents the equipment from being broken by water hammer due to an overflow amount.SOLUTION: A preoperation valve includes a valve opening control means to control a flow rate of fire-extinguishing water to be sent out not to exceed a rated water supply amount until a predetermined time lapses away after the start of water supply, and to leave the degree of valve opening maximum after a lapse of the predetermined time.

Description

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

  2. Description of the Related Art Conventionally, there is a pressurized pre-acting sprinkler fire extinguishing equipment in which a secondary side pipe connected to a sprinkler head is filled with compressed air 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-actuated sprinkler fire extinguishing system, water is discharged when both the fire detector and the sprinkler head are operated, so that it is unlikely to cause water damage. 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, since the secondary side pipe becomes negative pressure air instead of compressed air, 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 piping of 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 piping from becoming an excessive flow rate. It aims at obtaining the sprinkler fire extinguishing equipment which can be prevented.

  The sprinkler fire extinguishing equipment according to the present invention includes a pressurized water supply device, an open valve, a primary side pipe provided on the primary side of the open valve and connected to the proximal end side, and two open valves. A secondary side pipe which is provided on the secondary side and is connected to a sprinkler head and which is not normally filled with water; and a vacuum pump which is connected to the secondary side pipe and makes the secondary side pipe negative pressure. In the sprinkler fire extinguishing equipment, the open valve is provided with a valve opening degree control means, and the valve opening degree control means eliminates the negative pressure in the secondary side pipe by water supply to at least the secondary side pipe after the start of water supply. Until the predetermined time elapses, the flow rate of the fire extinguishing water to be sent out is controlled so as not to exceed the rated water supply amount, and the flow rate of the fire extinguishing water to be sent out after the predetermined time has passed It controls so that it may become.

  The sprinkler fire extinguishing equipment according to the present invention is characterized in that the valve opening control means controls the flow rate of fire-fighting water to be gradually increased until the predetermined time elapses after the start of water supply. To do.

  The sprinkler fire extinguishing equipment according to the present invention comprises a flow rate measuring means at the outlet of the open valve, and the flow rate of the fire extinguishing water sent from the open valve does not exceed the rated water supply amount by the measurement signal from the flow rate measuring means. Thus, the valve opening control means is feedback-controlled.

  According to the sprinkler fire extinguishing equipment according to the present invention, the water flowing in the secondary side pipe is not rapidly pressurized, and the flow rate of the water flowing in the pipe does not become an excessive flow rate. Therefore, it is possible to prevent the sprinkler fire extinguishing equipment from being damaged by the water hammer due to the excessive flow rate.

It is a lineblock diagram of the sprinkler fire extinguishing equipment concerning the present invention. It is a figure explaining an example of valve opening degree control of the pre-actuating valve. It is a figure explaining the other example of valve opening control of the pre-actuating valve 27. FIG.

  Based on FIG. 1 thru | or FIG. 3, the sprinkler fire extinguishing equipment which concerns on embodiment of this invention is demonstrated.

  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-acting valve 27 as an open valve, 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, and head operation detection. It is comprised from the apparatus 46, the vacuum switches 41 and 53, and the pressurized water supply apparatus 21 grade | etc.,.

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 receiving the fire alarm of the fire detector 3 sends the fire signal to the fire extinguishing system control panel 5 and the vacuum pump control panel 52. To send to. Further, the fire extinguishing system control panel 5 detects the flow of fire-extinguishing water by opening the pre-actuating valve 27 and the remote start valve 27b, which is an electric pilot valve that drives the pre-acting valve 27, via the relay 51. The signal switch 27 a, the release valve 47, the vacuum switch 41, and the head operation detection device 46 are electrically connected, and the fire pump control panel 6 is electrically connected to the pressurized water supply device 21. 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. Further, each of the falling pipes 13 is connected to the secondary side pipe 12. One end of the secondary pipe 12 is connected to one end of a pre-actuating valve 27 that is normally closed and is electrically opened in the event of a fire. The other end of the pre-actuating valve 27 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. The water supply apparatus is comprised by the pressurized water supply apparatus 21, the primary side piping 11, and the pre-operation valve 27 provided with a valve opening degree control means. The valve opening control means may be provided in the fire extinguishing system control panel 5 as will be described later.

  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 27. 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.

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. Note that an open valve 47 that is opened when the time during which the secondary side pipe 12 is set to a negative pressure in a normal state 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.
<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.

  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. 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 detection of the operation of the sprinkler head 2 is delayed.

On the other hand, in the present embodiment, the absolute value of the change amount per predetermined time of the pressure in the secondary side pipe 12 and the vacuum pipe 14 (detected value of the vacuum switch 41), which is negative pressure, is larger than the predetermined threshold value. When it becomes, it is determined that the sprinkler head 2 is activated. 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. In the present embodiment, when the fire detector 3 detects a fire, the operation of the vacuum pump 24 is stopped, or the vacuum pump 24 is not started even if the pressure in the vacuum pipe 14 rises when a fire is detected. To control. For this reason, it is not always necessary to provide the orifice 42.
(Fire fighting operation)
Subsequently, the fire extinguishing operation of the sprinkler fire extinguishing equipment will be described with reference to FIGS. 1 to 3.

  In the normal state, the pre-actuating valve 27 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 detects the fire. The fire receiver 4 transmits a fire signal to the fire extinguishing system control panel 5. After that, when the sprinkler head 2 is operated and the pressure of the secondary side pipe 12 that is negative pressure increases, the fire extinguishing system control panel 5 changes the pressure per predetermined time in the head operation detection device 46 via the relay 51. Based on the amount, the operation of the sprinkler head 2 is detected. When both the fire signal and the operation of the sprinkler head 2 are detected, the fire extinguishing system control panel 5 opens the pre-actuation valve 27 by opening the remote start valve 27b and supplies water to the secondary side pipe 12 ( Filling). At this time, with the opening of the pre-actuating valve 27, the pressure in the primary side pipe 11 decreases, and the pressurized water supply device 21 is started. Thereby, water is discharged from the sprinkler head 2 operated via the falling pipe 13 to the protection section 1, and the fire generated in the protection section 1 is extinguished. When the pre-actuating valve 27 is opened, the flowing water signal switch 27 a provided in the pre-acting valve 27 transmits a flowing water signal to the fire extinguishing system control panel 5 through the relay 51.

  At this time, the pre-actuating valve 27 does not immediately open fully, but starts opening at the start of water discharge, and restricts the water discharge flow rate by limiting the valve opening until a predetermined time elapses.

  For example, as shown in FIG. 2, from the start of water discharge until a predetermined time T (for example, 60 seconds) at which the negative pressure in the secondary side pipe 12 is eliminated due to water supply to at least the secondary side pipe 12 elapses. That is, until the pressure in the secondary side pipe 12 becomes equal to or higher than the atmospheric pressure, the valve opening degree of the pre-actuating valve 27 is set to a value n% (n is 100 so that the flow rate of fire-fighting water to be sent does not exceed the rated water supply amount). After the predetermined time T elapses, the pre-actuating valve 27 autonomously or the fire extinguishing system control panel 5 turns on the repeater 51 so that the valve fully opens (the valve opening is 100%). The valve opening degree of the pre-actuating valve 27 is controlled through this.

  Further, as shown in FIG. 3, the negative pressure in the secondary side pipe 12 is eliminated by water supply to at least the secondary side pipe 12 until a predetermined time T (for example, 60 seconds) elapses from the start of water discharge. Until the predetermined time T elapses, the pre-acting valve 27 is autonomously opened so that the pre-acting valve 27 is fully opened (opening degree 100%). Alternatively, the opening degree of the pre-actuating valve 27 may be controlled from the fire extinguishing system control panel 5 via the relay 51.

  In performing the above-described control described with reference to FIGS. 2 and 3, an automatic pressure regulating valve that performs two-stage water discharge disclosed in Japanese Patent Laid-Open No. 2005-069344, and an open / close disclosed in Japanese Patent Laid-Open No. 2005-103050. Using the valve device, as described above, it may be set in advance so that the valve opening is set until the predetermined time T elapses from the start of water discharge, and may be controlled autonomously. A control unit (not shown) provided in the fire extinguishing system control panel 5 is provided with a timing unit (not shown) and the valve opening based on the elapsed time is registered in advance in a storage unit (not shown) so that the valve opening of the pre-actuating valve 27 is controlled sequentially. Alternatively, a flow rate measuring means (not shown) is provided at the outlet of the pre-actuating valve 27, that is, the base end side of the secondary side pipe 12, and the measurement signal of the flow rate measuring means is sent to the fire extinguishing system control panel 5. The valve opening of the pre-actuating valve 27 is feedback-controlled by a control unit (not shown) provided in the fire extinguishing system control panel 5 so that the flow rate of the fire-extinguishing water sent from the pre-acting valve 27 does not exceed the rated water supply amount. Also good.

  As described above, since the flow rate of fire-extinguishing water fed from the pre-actuating valve 27 is controlled, it is possible to prevent the flow rate of water flowing into the secondary side pipe 12 from becoming an excessive flow rate. Therefore, the water hammer caused by the excessive flow rate can be prevented. Further, since the water hammer is more likely to occur as the flow rate of water flowing in the pipe increases, the secondary side pipe is controlled by controlling the pre-actuating valve 27 so that the flow rate at the start of water supply is limited to a constant flow rate. The occurrence of water hammer at 12 or the like can be suppressed.

  In the present embodiment, the flowing water shut-off valve 31 is closed by the pressure increase in the secondary side pipe 12. For this reason, even if the pre-actuating valve 27 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 of 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.

  In this embodiment, the opening of the pre-actuating valve 27 and the closing of the running water shut-off valve 31 are mechanically linked. However, the present invention is not limited to this, and the opening of the pre-acting valve 27 and the closing of the running water shut-off valve 31 are performed. May be electrically linked via the fire extinguishing system control panel 5. The above description relates to a sprinkler fire extinguishing equipment in which the fire detector 3 senses a fire and controls the sprinkler head 2 to open by detecting the operation of the sprinkler head 2. Even in the sprinkler fire extinguishing equipment that controls the preactuating valve 27 to be opened when the fire detector 3 detects a fire like the preacting sprinkler fire extinguishing equipment, the secondary side without waiting for the operation of the sprinkler head 2. Only the pipe 12 is filled, and the present invention still has the effect of suppressing the water hammer.

  Further, even in a fire extinguishing facility in which the secondary pipe 12 is not under negative pressure, water hammer at the start of water discharge that can occur due to factors other than excessive flow can be suppressed.

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, 24 Vacuum pump, 25 End test valve,
27 Pre-actuating valve, 27a Flow signal switch, 27b Remote start valve,
31 Flow-off 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 (3)

A pressurized water supply device, an open valve, a primary side pipe provided on the primary side of the open valve and connected to the proximal end side, a secondary side of the open valve, and a sprinkler head In a sprinkler fire extinguishing equipment comprising: a secondary side pipe that is connected and not normally filled with water; and a vacuum pump that is connected to the secondary side pipe and makes a negative pressure in the secondary side pipe;

The release valve includes a valve opening degree control means, and the valve opening degree control means has a predetermined time during which the negative pressure in the secondary side pipe is eliminated by water supply to at least the secondary side pipe after the start of water supply. Until the elapse of time, the flow rate of fire extinguishing water to be sent is controlled so as not to exceed the rated water supply amount, and the flow rate of fire extinguishing water to be sent is controlled to become the rated water feed rate after the predetermined time has elapsed. Sprinkler fire extinguishing equipment characterized by that.   2. The sprinkler fire extinguishing according to claim 1, wherein the valve opening control means controls the flow rate of fire-fighting water to be gradually increased until the predetermined time has elapsed after the start of water feeding. Facility. The valve opening control means is provided with a flow rate measuring means at the outlet of the open valve, and the flow rate of fire extinguishing water sent from the open valve does not exceed the rated water supply amount by the measurement signal from the flow rate measuring means. The sprinkler fire extinguishing equipment according to claim 1 or 2, wherein the feedback control is performed.