JPH07178193A - Delay mechanism for sprinkler extinguishment facility - Google Patents

Abstract

PURPOSE:To provide an alarm which turns on a switch to transmit alarm signals at a constant time after opening a valve every time regardless of the water pressure passing through flowing water detection equipment, by installing an automatic water discharge valve with a stopper body possible to adjust the drainage quantity by water pressure at the drainage opening in a signal water flowing part between flowing water detection equipment and delay equipment. CONSTITUTION:When a fire breaks out, a valve body 15 of a flowing water detection equipment 8 is completely opened, a signal water discharge opening 17 is also kept opening, water flown into the secondary side Y abundantly flows into the signal water discharge opening and pushes a stopper body 27 of an automatic water discharge valve away to open a drainage opening 24 wherefrom a part of the signal water is discharged. The signal water with a quantity over the total quantity discharged from the discharge opening 24 of the automatic discharge valve 22 and an orifice 20 is sent and flown into a cross joint 19 to raise the level in a chamber. When the level comes over an air pipe 21, air remained in the upper part of the chamber is compressed, and when the pressure comes over a designated pressure, a switch 11 is turned on to transmit electric signals to a control panel and an alarm is transmitted from the control panel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a delay mechanism in a water flow detection device for sprinkler fire extinguishing equipment.

[0002]

2. Description of the Related Art In a sprinkler fire extinguishing system, a water supply pipe 1 is inserted into a water source 2 as shown in FIG. 2, and a pump 3, a pressure tank 4, a water supply pipe pressure switch 5 and a water shutoff valve are provided in the middle of the water supply pipe. 6th class is installed. The water supply pipe 1 extending upward is drawn into each floor by a branch pipe 7, and is connected to a primary side of a flowing water detection device 8 installed on each floor. Flow detector 8
A delay device 10 is connected to the via a signal water extraction pipe 9. A switch 11 is installed in the delay device 10, and the switch is electrically connected to the control panel 12. The water supply pipe pressure switch 5 and the pump 3 attached to the water supply pipe 1 are also electrically connected to the control panel 12. A horizontal pipe 13 is connected to the secondary side of the flowing water detection device 8, and a sprinkler head 14 is attached to the horizontal pipe via a falling pipe.

There are two types of sprinkler fire extinguishing equipment, one is a wet type in which water is filled up to the tip of the falling pipe and the other is a dry type in which only compressed air is filled in after the secondary side of the water flow detecting device. Even so, the water flow detector is an indispensable auxiliary facility.

In a sprinkler fire extinguishing facility, when a sprinkler head is activated and water or compressed air flows out from the sprinkler head in the event of a fire, water sent from a water source is sprayed from the activated sprinkler head through a water flow detection device. It has become so. The water flow detection device is a valve body that seals the valve seat during normal times, so that when a fire occurs, the valve body opens and allows water to pass through, and a portion of the passing water flows into the signal water extraction pipe. It was done. The water that has flowed out to the signal water extraction pipe turns on the switch of the delay device to give an alarm.

By the way, in the sprinkler fire extinguishing equipment,
Water sometimes passed through the water flow detector even when there was no fire. For example, in normal times, the water supply pipe 1 on the primary side of the water flow detection device 8 is always filled with water under a certain pressure by the pressure tank 4, but the pressure of the water may decrease due to leakage or backflow. . Then, it is the water supply pipe 1
The water supply pipe pressure switch 5 installed in
2, an electric signal is sent to the pump 2, and the pump 3 of the water source 2 is started by a command from the control panel. At this time, pressure is suddenly applied to the inside of the water supply pipe due to the sudden activation of the pump, so that the valve body of the flowing water detection device is momentarily opened slightly and water slightly passes from the primary side to the secondary side of the flowing water detection device. If the water flow detection device sensed the passage of water during such non-fire and issued an alarm, it would cause confusion such as a report being sent to the fire department or a guard rushing each time. turn into. Therefore, in order to prevent the alarm due to the momentary operation of the water flow detection device, the delay device delays the alarm transmission.

Generally, there are a chamber type and a mechanical type as a delay device installed in a flowing water detecting device. With the chamber type, a switch is attached to the upper part of the hollow chamber, and the water flowing out from the signal water outlet of the water flow detection device flows into the chamber and the water rises in the chamber. When the air pressure reaches a predetermined value, the switch becomes conductive and sends an electric signal to the control panel,
It is supposed to give an alarm.

The mechanical type means that the water flowing out from the signal water outlet of the water flow detecting device applies pressure to the inside of the delay device to push the internal compression spring, the liquid or the like to make the switch conductive. Is.

In any of the delay devices, if the water passing through the water flow detecting device in the non-fire state remains in the chamber or inside of the delay device through the signal water outlet, the water will not pass through in the non-fire condition frequently. If this happens, more water will enter the delay device, eventually turning on the switch and triggering an alarm. In order to prevent such false alarms, the delay mechanism of the conventional water flow detection device is provided with an orifice in the flow part of the signal water so as not to collect it in the delay device even if water is sent during non-fire, It was discharged from the orifice.

[0009]

The pressure of the water sent from the water source decreases toward the upper floors due to gravity, so the pressure of the water passing through the running water detection device when a fire occurs on the upper floors is , In the event of a fire on the lower floors, the pressure of the water passing through the flow detector will be lower than that of the water.

As described above, the pressure of the water passing through the water flow detecting device is different on each floor when a fire occurs, but all the delay mechanisms of the water flow detecting devices installed on each floor have the same delay time,
For example, the pressure of water passing through the water flow detection device is 5 Kg / c
I used the one adjusted to give an alarm after 10 seconds at m ² . Therefore, in the case of a fire, the delay mechanism of the conventional water flow detection device can issue an alarm 10 seconds after opening the valve body of the water flow detection device on the 1st floor, but 40 seconds after opening the valve body on the 10th floor. There was a delay in the call to issue an alarm. In this way, the delay of the alarm after the fire will delay the notification to the fire department and the guard room,
It will also interfere with evacuation and taking out important items.

The present invention provides a delay mechanism for a flowing water detecting device capable of conducting a switch and always issuing an alarm after a certain time has elapsed after opening the valve body, regardless of the pressure of the water passing through the flowing water detecting device. To do.

[0012]

In the delay mechanism of the conventional sprinkler fire extinguishing equipment, the signal water is drained only by the orifice of the cross joint connected to the signal water extraction pipe. Therefore, in the conventional delay mechanism, since the amount of water drained from the orifice is constant regardless of the amount of signal water,
The alarm generation time varied depending on the amount of signal water. Therefore, the inventors of the present invention can make a certain amount of water flow into the chamber of the delay device or the inside of the machine irrespective of the pressure passing through the water flow detection device if the amount of drainage can be appropriately changed depending on the flow rate of the signal water. The present invention was completed by paying attention.

According to the present invention, in a delay mechanism of a sprinkler fire extinguishing facility, when a fire occurs, the signal water flowing out from the water flow detecting device flows into the delay device to make a switch installed in the delay device conductive. The delay mechanism of the sprinkler fire extinguishing equipment, which is characterized in that an inflow port and a drain port are formed in the signal water flowing part between them, and an automatic drain valve with a plug body that can adjust the drainage amount by water pressure is installed at the drain port. Is.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front sectional view for explaining a delay device mechanism of a water flow detecting device of the present invention. The water flow detection device 8 is divided into a primary side X and a secondary side Y by a valve body 15. The valve body 15 closes the valve seat 16 as indicated by the alternate long and short dash line in normal time, and when a fire occurs and the sprinkler head operates and water or compressed air escapes from the sprinkler head, the pressure on the secondary side is reduced. Therefore, the valve body 15 is opened and water flows from the primary side X to the secondary side Y. The water flowing into the secondary side passes through the horizontal pipe and is sprayed from the activated sprinkler head to extinguish the fire.

When the valve body 15 is opened, the signal water intake port 17 is also opened. Therefore, the water flowing into the secondary side Y also flows into the signal water intake port 17 and the signal water connected thereto is connected. It is led to the delay device by the take-out pipe 9.

A stop valve 18 is connected in the middle of the signal water extraction pipe 9, and the end of the stop valve 18 is further connected to a lateral joint portion a of a cross joint 19. The lower joint portion b of the cross joint 19 is closed, an orifice 20 is bored in the closed surface, and an air pipe 21 is installed next to the orifice pipe 21 so as to extend upward through the surface. . A chamber (delay device) 10 having a switch 11 installed above is connected to an upper joint portion c of the cross joint 19. The air pipe 21 is the chamber 1
It is inserted up to the middle of 0. In the conventional delay mechanism of the sprinkler fire extinguishing equipment, the other lateral joint portion of the cross joint is sealed with a plug, but in the present invention, the automatic drain valve 22 is connected to this lateral joint portion.

The automatic drainage valve suitable for use in the present invention is T-shaped, and has an inflow port 23 formed laterally and an outflow port 24 formed vertically. The opposite side of the inflow port 23 is closed, and here the knob 2 that can be rotated from the outside is used.
5 is screwed. A compression spring 26 is attached to the tip of the knob, and a stopper 27 is slidably attached to the spring. In the normal state, the stopper 27 is pushed by the compression spring 26 and closes the outlet 24, as indicated by the alternate long and short dash line.

Next, the operating state of the delay mechanism of the flowing water detecting apparatus of the present invention will be described. When there is no fire, the pressure of water in the water supply pipe 1 decreases due to leakage or backflow, and the water supply pipe pressure switch 5 senses it and sends an electric signal to the control panel 12. Then, the control panel 12 issues a start command to the pump 3, and the water from the water source 2 is sent into the water supply pipe 1. Water suddenly flows into the water supply pipe 1 so that pressure is applied, the valve body 15 of the flowing water detection device 8 is slightly opened, and the water on the primary side X is discharged on the secondary side Y.
Flow into. At this time, the signal water intake 17 is also opened slightly, so that water flows into the signal water intake 17 and reaches the cross joint 19 through the signal water outlet pipe 9.
Since the valve body 15 opens instantaneously when there is no fire and the amount of water flowing into the signal water intake 17 is small, the automatic drain valve 22 connected to the lateral joint portion d of the cross joint 19
Even if it enters, the compression spring cannot be pushed against the compression spring 26. Therefore, the outlet 27 of the plug body 27 of the automatic drain valve 22 is not opened, and water does not flow out from the outlet.

A part of the water flowing into the cross joint 19 at the time of non-fire is discharged from the orifice 20 and a part thereof flows into the chamber 10 connected to the vertical joint portion c of the cross joint 19. However, since the amount of water that flows into the cross joint is small and the state of being sent is instantaneous, the water that has flowed into the chamber 10 stops rising halfway, is discharged from the orifice, and the water level drops, causing the switch 11 to drop. Do not conduct.

When a fire occurs, the valve body 1 of the water flow detection device 8
5 is completely opened as shown in FIG. 1 and the signal water outlet 17 is also left open, so that a large amount of water flowing into the secondary side Y flows into the signal water outlet. A large amount of water that has flowed into the signal water outlet 17 flows from the signal water outlet pipe 9 into the cross joint 19. Since a large amount of signal water having a high pressure flows in the cross joint, the plug body 27 of the automatic drain valve 22 connected to the lateral joint portion d of the cross joint 19 is pushed against the spring force of the compression spring 26. Then, the outflow port 24 closed by the plug 27 opens, and a part of the signal water is discharged from here.

Orifice 2 of cross joint 19
Although the signal water is discharged from 0 as well, the signal water is sent to the cross joint more than the amount of water discharged from the outlet 24 of the automatic drain valve 22 and the orifice 20. Therefore, most of the signal water flows into the chamber 23 and the inside of the chamber 23. To rise.

At this time, the air in the chamber 10 flows out from the air pipe 21. Then, when the signal water rises in the chamber and reaches the air pipe 21 or more, the signal water will flow out from the air pipe, but in the thin pipe, the water is less likely to flow than the air, so the signal water further rises. The air remaining in the upper part of the chamber will be compressed. When the pressure of the air becomes equal to or higher than a predetermined pressure, the switch 11 installed on the upper part of the chamber becomes conductive, sends an electric signal to the control panel 12, and an alarm is issued from the control panel.

By the way, when a fire occurs, the pressure of the water flowing through the flowing water detecting device is different between the upper floor and the lower floor as described above, and therefore the pressure of the signal water flowing into the cross joint is also different. Therefore, in the conventional delay mechanism, the rising speed of water flowing into the chamber was slow in the upper floors and high in the lower floors. However, in the delay mechanism of the present invention, since the automatic drain valve is installed at the place where the signal water flows, the amount of water flowing into the chamber becomes constant within a fixed time. That is, when a fire occurs on the lower floor, water with high pressure flows into the signal water extraction pipe, but since the signal water extraction pipe through which this signal water flows has an automatic drain valve, A large amount of water is also discharged from the automatic drain valve. Therefore, the amount of water flowing into the chamber of the delay device is not so large.

On the other hand, when a fire occurs on the upper floor, water with a low pressure flows into the signal water extraction pipe. Since the pressure of this signal water is low, the plug of the automatic drain valve cannot be pushed and the water other than the water discharged from the orifice flows into the chamber. At this time, the amount of water flowing into the chamber is approximately the same as the amount of water flowing into the chamber when a fire occurs in the lower floor.

When a fire occurs on the middle floor, the opening of the plug of the automatic drain valve is located at the middle position between the upper floor and the lower floor.
Therefore, on the upper, middle, and lower floors, the amount of water that flows into the chamber is constant within a fixed time, and the time until the alarm is issued is constant after the valve body of the water flow detection device is opened. is there.

The amount of inflow into the chamber on each floor can be easily adjusted by rotating the knob to change the spring force of the compression spring.

Although the automatic drain valve is installed in the lateral joint portion of the cross joint in the embodiment of the present invention, the automatic drain valve is not limited to the lateral joint portion of the cross joint, and the signal water is It can be installed at any place where it flows. Further, in the embodiment of the present invention, the chamber type is shown as the delay device, but it goes without saying that a mechanical type can also be adopted in the present invention.

[0028]

As described above, in the delay mechanism of the sprinkler fire extinguishing equipment of the present invention, the automatic drain valve capable of automatically adjusting the discharge amount by the pressure of the signal water is installed in the portion where the signal water flows. Even if the pressure and flow rate of signal water are different, the amount of water flowing into the delay device can be made constant within a fixed time, and an alarm is issued at a fixed time after a fire regardless of the floor height. That is excellent in reliability.

[Brief description of drawings]

FIG. 1 is a front sectional view of a delay mechanism of a sprinkler fire extinguishing facility according to the present invention.

FIG. 2 is a piping system diagram of a sprinkler fire extinguishing facility.

[Explanation of symbols]

 8 Flow Water Detection Device 9 Signal Water Extraction Pipe 10 Delay Device 11 Switch 15 Valve Body 17 Signal Water Removal Port 19 Cross Joint 20 Orifice 21 Air Pipe 22 Automatic Drain Valve 23 Inlet 24 Drain Port 25 Knob 26 Compression Spring 27 Plug

Claims (2)

[Claims] 1. In a delay mechanism of a sprinkler fire extinguishing facility, in the event of a fire, the signal water flowing out of the water flow detecting device flows into the delay device and causes a switch installed in the delay device to conduct. A delay mechanism for sprinkler fire extinguishing equipment, characterized in that an inflow port and a drain port are formed in the signal water flow section, and an automatic drain valve with a plug body that can adjust the drainage amount by water pressure is installed at the drain port. 2. The drain valve has a plug body held by one end of a compression spring, and the other end of the compression spring is held by a knob rotatable from the outside. Delay mechanism of the described sprinkler fire extinguishing equipment.