JPH035180B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a monitoring device for fire extinguishing equipment, which monitors whether the fire extinguishing equipment, which supplies and discharges pressurized fire extinguishing water to a fire extinguishing head from a fire extinguishing pump, is in a normal operable state.

Conventionally, in sprinkler fire extinguishing equipment, etc., pressurized fire extinguishing water is supplied from the fire pump to a main pipe, which is connected to a branch pipe via an automatic alarm valve for each floor. The piping configuration is such that multiple fire extinguishing heads are connected to branch pipes.

On the other hand, in the event of a fire, a pressure switch installed in the pressure tank detects a drop in the pressure inside the pipe due to the operation of the fire extinguishing head, and starts the fire pump.

By the way, if such fire extinguishing equipment is used for a long time, water may leak due to loosening of pipe connections, etc. When water leaks, the pressure inside the pipes decreases, and the pressure rises as in the case of a fire. The fire pump is activated by the activation of the tank's pressure switch, and the reduced pressure inside the pipes is restored to the predetermined pressure.

However, even if the fire pump is started to restore the pressure in the pipe due to a water leak, unless the water leak is stopped, the drop in pressure in the pipe cannot be prevented. If this had occurred, there was a risk of equipment damage or personal injury.

Additionally, it was unclear whether the leak was occurring in the main pipe or in the branch pipe.

The present invention was made in view of these conventional problems, and it is possible to notify a drop in pressure inside a pipe due to a water leak before the fire pump is activated, and to identify whether the water leak is in the main pipe or in a branch pipe. The purpose of this invention is to provide a monitoring device for fire extinguishing equipment.

To achieve this objective, the present invention supplies fire extinguishing water pressurized by a fire extinguishing pump to the fire extinguishing head through a main pipe and a branch pipe branched from the main pipe via an automatic alarm valve for each floor, and In a monitoring device for fire extinguishing equipment that detects an automatic alarm valve pressure switch or a drop in main pipe pressure and starts a fire pump, a branch pipe pressure detection means is provided on the branch pipe to detect a drop in pressure inside the pipe, and a branch pipe pressure detection means is installed on the main pipe side. A main pipe pressure detection means is provided for detecting that the main pipe pressure has decreased to a predetermined pressure before starting the pump and outputting an alarm.

Embodiments of the present invention will be described below based on the drawings.

The figure is an explanatory diagram showing an example of fire extinguishing equipment equipped with the monitoring device of the present invention.

First, the configuration will be described. A fire pump 1 driven by a motor 2 is installed in the basement B1F of a building, and the drive of the fire pump 1 is controlled by a pump control panel 3. A suction pipe 5 is lowered from the suction side of the fire pump 1 to a water source tank 4 provided in the basement of the floor where the fire pump 1 is installed, and a main pipe 6 is connected to the discharge side of the fire pump 1. The main pipe 6 extends vertically to the top floor of the building.

A branch pipe 8 is branched and connected to the main pipe 6 passing through each floor of the building, 1F, 2F, etc., via an automatic alarm valve 7.
A plurality of fire extinguishing heads 9 are connected to the branch pipe 8 via branch pipes.

Here, the automatic alarm valve 7 opens the valve with the extinguishing water that flows when the fire extinguishing head 9 is activated by the heat of the fire, and when the valve is opened, the automatic alarm valve pressure switch 10 provided in the automatic alarm valve 7 is activated. A starting signal for the fire pump 1 can be given to the pump control panel 3.

The end of the branch pipe 8 branched and connected to the main pipe 6 via the automatic alarm valve 7 is connected to the drain pipe 12 via the gate valve 11.
gate valve 1 during normal monitoring conditions.
1 is in a closed state.

On the other hand, a pressure tank 14 is installed in the basement B1F where the fire pump 1 is installed, and a main pipe 6 is branched and connected to the bottom of the pressure tank 14, and the air in the pressure tank 14 is compressed by the water pressure of the main pipe 6. The internal pressure of the main pipe 6 is kept above a certain pressure by the reaction force of the compressed air.

Next, to explain the device configuration for realizing the monitoring device of the present invention, first, a branch pipe pressure switch 1 is installed on the secondary side of the automatic alarm valve 7 provided in the branch pipe 8 on each floor.
5 is provided together with a pressure gauge 16, and the branch pipe pressure switch 15 detects that the internal pressure of the branch pipe 8 has fallen below a certain pressure, and switches the pressure switch 15 to the pump control panel 3 or a monitoring device in a central monitoring room (not shown). gives the detection output. In addition, pressure switch 1 for branch pipe
5 and the pressure gauge 16 are installed at easily visible positions such as walls on each floor.

Furthermore, the pressure tank 14 installed in the basement B1F has a pump starting pressure that can be activated to output a pump starting signal to the pump control panel 3 when the internal pressure of the main pipe 6 drops below a certain pressure. A switch 17 is provided, and a water leak alarm in the main pipe 6 is issued by detecting that the internal pressure of the main pipe 6 has decreased to a predetermined pressure before starting the pump based on the output of the pump starting pressure switch 17 provided in the pressure tank 14. A main pressure sensor 18 and a pressure gauge 19 are provided for this purpose. The pressure detected by this main pressure sensor 18 is given to the pump control panel 3 or a monitoring panel in a central monitoring room (not shown), and it is determined that the pressure detected by the main pressure sensor 18 has fallen to the constant pressure before starting the pump. is detected and a water leakage alarm of the main pipe 6 is issued.

In addition, in this embodiment, the pump control panel 3
is equipped with a printer 20, and an automatic alarm valve 7.
The drop in pressure inside the branch pipe 8 and the main pipe 6 can be recorded by a pressure switch 15 for the branch pipe provided on the secondary side of the pipe and a pressure sensor 18 for the main pipe provided in the pressure tank 14. Of course, the pump control panel 3 may be provided with warning means for a drop in branch pipe pressure and a drop in main pipe pressure.

Next, the action will be explained.

First, in the normal monitoring state, the pressure inside the main pipe 6 and the branch pipe 8 is maintained at a predetermined pressure or higher by pressurizing the fire extinguishing water by temporarily starting the fire pump 1.

In this state, for example, if a fire breaks out on the 1st floor and one of the fire extinguishing heads 9 is activated due to the heat from the fire and releases fire extinguishing water, the flow of fire extinguishing water will open the automatic alarm valve 7 and the automatic alarm valve pressure will rise. switch 10
is activated, and as the pressure in the pressure tank 14 decreases via the main pipe 6, the pump starting pressure switch 17 is activated.

The activation of the fire extinguishing pump 1 based on the activation of the extinguishing head 9 due to a fire is performed using either the output of the automatic alarm valve pressure switch 10 or the output of the pump activation pressure switch 17 provided in the pressure tank 14. Usually, the fire pump 1 is driven by the output of the pressure switch 17 for starting the pump of the pressure tank 14. Note that starting the fire extinguishing pump 1 by the automatic alarm valve pressure switch 10 is performed when the pressure in the pressure tank 14 decreases from the operation of the fire extinguishing head, for example, when the main pipe 6 to the pressure tank 14 has a large volume and a complicated shape. Since there is a large time delay until the fire occurs, in this case, the fire pump 1 will be activated by the output of the automatic alarm valve pressure switch 10.

Next, if the pressure inside the branch pipe 8 decreases due to water leakage under normal monitoring conditions, before the pressure decreases to the main pipe 6 side via the automatic alarm valve 7, the secondary side of the automatic alarm valve 7, i.e. The branch pipe pressure switch 15 installed on the branch pipe 8 side detects the pressure drop in the branch pipe 8 due to water leakage, activates the alarm on the pump control panel 3 or the monitoring panel in the central monitoring room, and removes the branch pipe 8 where water has leaked. Water leak alarms will be issued along with floor-specific displays.

On the other hand, if the internal pressure of the main pipe 6 decreases due to water leakage, the pressure detected by the main pressure sensor 18 before the pressure decreases to the operating pressure of the pump starting pressure switch 17 is determined to be the same as before starting the pump. When the pressure drops, the pump control panel 3 or a monitoring panel provided in the central monitoring room issues a water leak alarm based on the pressure drop in the main pipe 6. If the main pipe 6 water leak alarm is issued based on the pressure detected by the main pipe pressure sensor 18, if left as it is, the fire pump 1 will eventually start, so the water leak in the main pipe 6 will be activated. Find the location and make repairs.

In this way, when the pressure inside the pipe decreases due to a water leak in the main pipe 6, a water leak alarm is first issued, and when the pressure further decreases, the fire pump 1 is started, so it is known in advance from the water leak alarm that the fire pump 1 will start due to a water leak. It is possible to avoid suddenly starting the fire pump 1 due to a drop in the pressure inside the main pipe 6. Further, it is possible to easily identify whether water is leaking from the branch pipe 8 or from the main pipe 6 based on the alarm caused by the activation of the branch pipe pressure switch 15 and the alarm based on the detection output of the main pipe pressure sensor 18. can.

In the above embodiment, the drop in main pipe pressure before starting the pump is detected by the main pipe pressure sensor 18, but a pressure switch that is activated when the pressure drops to the level before starting the pump is used. Good too. In addition to fire pump 1, a small-capacity pump is installed to maintain the internal pressure of main pipe 6 at a constant pressure, and the small-capacity pump is activated when a drop in pressure to the constant pressure is detected before starting the fire pump. Alternatively, the pressure inside the main pipe 6 may be restored. Furthermore, by combining the branch pipe pressure switch 15 and the main pipe pressure sensor 18 with an automatic inspection system, the pressure inside the main pipe 6 and the branch pipe 8 can be constantly monitored, and a drop in the pressure inside the pipe due to water leakage etc. can be quickly detected. can be detected, further improving the reliability of fire extinguishing equipment.

As explained above, according to the present invention, fire extinguishing water pressurized by a fire pump is supplied to the fire extinguishing head through the main pipe and branch pipes branched from the main pipe via automatic alarm valves for each floor. In a monitoring device for fire extinguishing equipment that starts a fire pump by detecting the activation of an automatic alarm valve or a drop in main pipe pressure due to activation, a branch pipe pressure detection means is provided to detect a drop in pressure inside a branch pipe, and We have installed a mains pressure detection means that outputs an alarm when it detects that the pressure has dropped to a predetermined pressure before starting the pump, so even if the pressure inside the pipe drops due to water leakage in the mains, it will be detected before starting the fire pump. Since an alarm is output, if there is a problem with the fire pump or motor, it is possible to prevent damage to equipment or personal injury due to sudden activation of the fire pump. It becomes possible to take repair equipment for water leaks while the automatic activation of the fire pump is canceled.

Furthermore, since the pressure drop due to water leakage is performed separately on the branch pipe side and the main pipe side, the location of the water leakage can be easily identified.

[Brief explanation of the drawing]

The figure is an explanatory diagram of fire extinguishing equipment equipped with the inspection device of the present invention. 1: Fire pump, 2: Motor, 3: Pump control panel, 4: Water source tank, 5: Suction pipe, 6: Main pipe, 7:
Automatic alarm valve, 8: Branch pipe, 9: Fire extinguishing head, 1
0: Automatic alarm valve pressure switch, 11, 21: Gate valve, 12: Drain pipe, 14: Pressure tank, 15: Branch pipe pressure switch, 16, 19: Pressure gauge, 1
7: Pressure switch for starting the pump, 18: Main pressure sensor, 20: Printer.

Claims (1)

[Scope of Claims] 1. Fire extinguishing water pressurized by a fire extinguishing pump is supplied to a fire extinguishing head through a main pipe and a branch pipe branched from the main pipe via an automatic alarm valve for each floor, and an automatic alarm is generated by activation of the fire extinguishing head. A monitoring device for fire extinguishing equipment that starts the fire extinguishing pump by detecting the operation of a valve or a drop in main pipe pressure, comprising a branch pipe pressure detection means for detecting a drop in pressure inside the branch pipe; 1. A monitoring device for fire extinguishing equipment, comprising main pipe pressure detection means for detecting that the pressure has decreased to a predetermined pre-starting pressure and outputting an alarm.