JP2013022104A - Sprinkler fire extinguishing equipment and control method for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide sprinkler fire extinguishing equipment for preventing overflow caused by negative pressure in a secondary side pipe and preventing an occurrence of water hammer due to the overflow and damage of the equipment caused by water hammer.SOLUTION: A check valve 38 for preventing flowing out of water for extinguishing fire and an opening/closing valve 37 are provided on a distal end side of the secondary side pipe 12. The opening/closing valve is opened before opening a pre-action valve 22 to let the outside air in the secondary side pipe 12 and prevents overflow by increasing the air pressure in the secondary side pipe 12 with the outside air flowing in. An end part of the secondary side pipe 12 is provided with a check valve 39 for preventing flowing in of the outside air and an air vent 34 and, through this, the air inside the secondary side pipe 12 is discharged by water for extinguishing fire transferred into the secondary side pipe 12 to reduce a time spent for charging the secondary side pipe 12 with water.

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 piping from becoming an excessive flow rate, and prevents damage to equipment due to the water hammer caused by the excessive flow rate. The purpose is to obtain a sprinkler fire extinguishing equipment.

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 not normally filled with water, and the secondary side pipe. In a pre-actuated sprinkler fire extinguishing system comprising a vacuum pump that is connected and normally has a negative pressure in the secondary side pipe, one end is opened to the atmosphere, and the other end is connected via a check valve. A normally closed on-off valve connected to the base end side of the secondary side pipe, opened prior to the opening of the pre-actuating valve, and allowing outside air to flow into the secondary side pipe;

When the secondary side is connected to the primary side of the check valve whose secondary side is opened to the atmosphere, the primary side is connected to the end of the secondary side pipe, and fire-extinguishing water is pumped through the secondary side pipe And an air vent for discharging the air in the secondary side pipe. 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 that negatively pressures the inside of the secondary side pipe, on the base end side of the secondary side pipe Connect the secondary side of the check valve, connect one end of a normally closed on-off valve whose other end is open to the atmosphere to the primary side of the check valve, and connect the air vent to the end of the secondary pipe Connecting the primary side of the air vent, connecting the secondary side of the air vent to the primary side of the check valve, opening the secondary side of the check valve to the atmosphere, and opening and closing the valve prior to opening the pre-acting valve. Open the valve to allow the outside air to flow into the secondary side pipe, and to the fire-fighting water pumped from the opened pre-actuating valve Wherein the air in the secondary side in the pipe can be controlled to discharge through the air vent I.

  According to the sprinkler fire extinguishing equipment according to the present invention, according to the configuration according to claim 1 or the control method according to claim 2, the inside of the secondary side pipe is brought to normal pressure at the start of water supply, and the inside of the secondary side pipe Since the excessive flow rate of fire-extinguishing water due to the negative pressure of the water is prevented, damage to the water hammer and the equipment due to the excessive flow rate can be prevented. In addition, an open / close valve that is remotely opened when the pressure in the secondary side pipe is set to normal pressure is provided on the base end side of the secondary side pipe, and an air vent and a check valve that operate mechanically autonomously are provided on the secondary side. Since it is provided at the end of the pipe, it is not necessary to lay the electric wire at the end of the secondary side, and the electric wire for control can be concentrated near the base end of the secondary side pipe, so that the wiring work is facilitated.

It is a lineblock diagram of the sprinkler fire extinguishing equipment concerning an embodiment. It is a figure explaining the structural example of the air vent in FIG. It is a figure explaining the operation | movement which the air vent in FIG. 1 discharges | emits the air of secondary side piping. It is a figure explaining the operation | movement which the air vent in FIG. 1 closes.

  Based on FIG. 1 thru | or FIG. 4, the sprinkler fire extinguishing apparatus 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-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 as the detection means, the open valve 47, the vacuum switch 41, the head operation detection device 46, and the on-off valve 35 to be described later are electrically connected, 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. Further, each of the falling pipes 13 is connected to the secondary side pipe 12. One end of the secondary side pipe 12 is connected to one end of the pre-actuating valve 22 that is normally closed and is electrically opened in the event of a fire. The other end 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.

  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 connected to one end of an on-off valve 37 whose other end is opened to the atmosphere via a check valve 38 on the base end side, that is, the pre-acting valve 22 side, Is connected to the primary side of the air vent 34, and to the secondary side of the air vent 34 is connected one end of a check valve 39 whose other end is opened to the atmosphere.

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

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.

  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 with reference to FIGS. 1, 3, and 4.

  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 first opens the on-off valve 37, and the outside air that is at atmospheric pressure through the opened on-off valve 37 and check valve 38. Flows into the secondary side pipe having a negative pressure, and the pressure in the secondary side pipe 12 approaches the atmospheric pressure. The fire extinguishing system control panel 5 opens the pre-actuation valve 22 by opening the remote start valve 22b after a predetermined time after opening the on-off valve 37, and supplies (fills) water to the secondary side pipe 12. . That is, the fire extinguishing system control panel 5 opens the on-off valve 37 prior to opening the remote start valve 22b (before a predetermined time).

The fire-extinguishing water pumped from the opened pre-actuating valve 22 toward the secondary pipe 12 whose internal pressure is close to the atmospheric pressure closes the check valve 38 by the pressure and passes through the secondary pipe 12. However, the water flow caused by this overflow can be prevented because the overflow caused by the negative pressure in the secondary pipe 12 does not occur.
As the pre-actuating valve 22 is opened, the pressure in the primary side pipe 11 is lowered, and the pressurized water supply device 21 is started. 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.

  Further, the fire-extinguishing water pumped through the secondary side pipe 12 proceeds while pushing out the air flowing into the secondary side pipe 12 through the air vent 34 and the check valve 39 until the air vent 34 is filled. (See FIG. 3). Therefore, the fire-extinguishing water travels through the secondary side pipe 12 without being hindered by the outside air flowing into the secondary side pipe 12, thereby preventing 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. 4). The fire-extinguishing water in the secondary side pipe 12 that has reached the specified pressure is discharged from the sprinkler head 2 operated via the falling pipe 13 to the protection section 1 at the specified discharge pressure, and the fire generated in the protection section 1 is discharged. extinguish a fire.

  As described above, outside air is allowed to flow into the secondary side pipe 12 via the on-off valve 37 that is opened prior to the start of water discharge, and the pressure in the secondary side pipe 12 is changed from the negative pressure by the vacuum pump 24 to the atmospheric pressure. Therefore, the fire extinguishing water traveling in the secondary side pipe 12 does not become an excessive flow rate due to the negative pressure in the secondary side pipe 12, so the water hammer caused by this excessive flow rate and the fire extinguishing by this Damage to equipment can be prevented.

  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. 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 controlling the operation of the sprinkler head 2. Even in the sprinkler fire extinguishing equipment that controls the preactuating valve 22 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. It only fills the pipe 12, and the present invention still has the effect of preventing water hammer caused by the negative pressure in the secondary pipe 12.

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, 37 Release 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 (2)

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 A pre-actuated sprinkler fire extinguishing system comprising a vacuum pump for negative pressure in the side pipe;

One end is opened to the atmosphere, the other end is connected to the base end side of the secondary side pipe via a check valve, and opened before the pre-actuating valve is opened. A normally closed on-off valve that flows into the piping;
When the secondary side is connected to the primary side of the check valve whose secondary side is opened to the atmosphere, the primary side is connected to the end of the secondary side pipe, and fire-extinguishing water is pumped through the secondary side pipe And an air vent for discharging the air in the secondary side pipe,
Sprinkler fire extinguishing equipment characterized by comprising: 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 A control method for a pre-actuated sprinkler fire extinguishing equipment comprising: a vacuum pump for negative pressure in the side pipe;

Connect the secondary side of the check valve to the base end side of the secondary side pipe, connect one end of a normally closed on-off valve whose other end is open to the atmosphere to the primary side of the check valve,
Connecting the primary side of the air vent to the end of the secondary pipe, connecting the secondary side of the air vent to the primary side of the check valve, and opening the secondary side of the check valve to the atmosphere;
Prior to the opening of the pre-actuating valve, the on-off valve is opened to allow outside air to flow into the secondary side pipe, and the air in the secondary side pipe is extinguished by fire-extinguishing water pumped from the opened pre-acting valve. Is controlled so as to be discharged through the air vent.

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