JPH0370985B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pressure tank inspection device for fire pump equipment, which inspects a pressure tank used for starting control of a fire pump.

(Prior Art) Conventionally, in the case of sprinkler fire extinguishing equipment and foam extinguishing equipment, a fire pump equipment that supplies fire extinguishing water under pressure is installed in the basement floor of a building or the like.

For this fire pump equipment, a main water supply pipe that rises vertically of the building is connected to the discharge side of the fire pump, a branch pipe is connected to each floor from the main water supply pipe, and multiple sprinkler heads are connected to the branch pipe. I am wearing it.

In addition, a pressure tank that introduces pressurized water from the water mains is installed near the fire pump.The introduction of pressurized water compresses the air in the tank, and this compressed air lowers the pressure of the water mains to the specified pressure when the pump is stopped. I try to keep it above that.

Furthermore, the pressure tank is equipped with a pressure switch that generates a detection output when the tank pressure drops below a specified pressure. As the tank pressure decreases,
The detection output of the pressure switch is given to the pump control panel to start the fire pump.

Since the pressure tank installed in fire pump equipment has the important function of starting the pump in the event of a fire, it is necessary to periodically check whether the pressure tank is operating normally and the pump can be started. .

Therefore, in the case of conventional pressure tank inspection equipment,
An electric valve is installed to discharge the pressurized water from the pressure tank, and during inspections, the electric valve is opened to forcefully discharge the pressurized water to lower the tank pressure, and it is confirmed whether the pump is started by operating the pressure switch. There is.

After the pump has been started normally, the pump is stopped by continuing the pump operation for a certain period of time with the electric valve closed, and then stopping the pump operation.

(Problem to be Solved by the Invention) However, with such conventional pressure tank inspection devices, the pump continues to operate for a certain period of time after the pressure tank operation test is completed, and then the pump is stopped. Even if the pump continues to operate for a certain period of time, it is not confirmed whether the tank pressure has actually recovered, and even if the pressure recovery is insufficient due to equipment abnormalities such as loose piping connections, There was a problem in that even if the sprinkler was activated due to a pressure switch failure or a fire, the inspection process would be completed and the system would return to a steady monitoring state.

(Means for Solving the Problems) The present invention has been made in view of such conventional problems, and it is possible to check the recovery of tank pressure at the end of inspection to check whether there is any equipment abnormality. The purpose of this invention is to provide a pressure tank inspection device for fire pump equipment.

In order to achieve this purpose, in the present invention, a water supply pipe that supplies pressurized water to a sprinkler head installed at the end of the pipe is connected to the fire pump discharge side,
Water for pressurization of the water supply pipe is introduced into the pressure tank to compress the internal air, and this compressed air maintains the pressure of the water supply pipe above the specified pressure when the pump is stopped, and further reduces the tank pressure by operating the sprinkler head, etc. As a pressure tank inspection device for fire pump equipment that detects and controls the start of the fire pump, it forcibly discharges pressurized water from the pressure tank and starts and operates the fire pump based on the detection output of the pressure switch due to a drop in tank pressure. A test operating means for stopping forced draining of the pressure tank after pump operation; a recovery pressure detecting means for detecting recovery of the tank pressure to a specified pressure after the test operating means stops forced draining of the tank; An inspection termination means is provided which determines that the pump is normal and instructs to stop the pump when a detection output is obtained within a certain period of time.

(Function) According to the configuration of the present invention, the fire pump is activated due to a pressure drop due to forced drainage of the pressure tank, and when the pump is stopped after confirmation of activation, the fire pump is activated at a constant rate while the forced drainage of the pressure tank is stopped. We will monitor whether the specified recovery pressure is obtained within a certain time, and if the tank pressure recovers to the specified pressure within a certain period of time, we will conclude the inspection as normal.
If the pressure does not recover to the specified level within a certain period of time, it will be determined that there is an equipment abnormality and necessary inspection and repair will be carried out. Therefore, equipment abnormalities can be immediately known and equipment inspection and repair can be carried out promptly.

(Example) FIG. 2 is an explanatory diagram showing fire pump equipment to which the pressure tank inspection device of the present invention is applied.

In Fig. 2, 1 is a fire extinguishing pump, which is driven by a motor 2, draws up and pressurizes fire extinguishing water stored in an underground water tank 3 through a suction pipe 4, and the pressurized water from the fire extinguishing pump 1 is kept open at all times. The water is supplied to the main water supply pipe 6 via the gate valve 5 located therein. The main water supply pipe 6 is vertically erected in the building, and a branch pipe 7 is connected to each floor, and a plurality of sprinkler heads 8 are attached to the branch pipe 7.

On the other hand, a pressure tank 9 is installed near the fire pump 1, and pressurized water from the main water supply pipe 6 is introduced through a pipe 10 to the bottom of the pressure tank 9 via a manual valve 11 that is kept open at all times. There is. The pressure tank 9 compresses the air inside with pressurized water from the main water supply pipe 6 introduced through the piping 10, and uses this compressed air to maintain the pressure inside the main water supply pipe 6 at a specified pressure when the fire pump 1 is stopped. ing.

The pressure tank 9 is also provided with a pressure switch 12, which turns off the switch contact when the pressure of the compressed air in the pressure tank 9 exceeds a specified pressure, for example, 10 Kgf/ ^cm2 , and in the event of a fire. When the sprinkler head 8 is activated by the heat caused by the fire and sprays fire extinguishing water, the pressure inside the main water supply pipe 6 decreases, and as a result, the pressure of the compressed air in the pressure tank 9 decreases below the specified pressure. , the pressure switch 12 turns on the switch contact.

The switch output of the pressure switch 12 provided in the pressure tank 9 is given to the pump control panel 14.
When the pressure of the compressed air in the pressure tank 9 drops below the specified pressure and the switch contact of the pressure switch 12 is turned on, the pump control panel 14 turns on the pressure switch 12.
In response to a switch-on signal from the engine, the motor 2 is activated and the fire pump 1 starts operating.
Note that the pressure tank 9 is provided with a pressure gauge 13.

Furthermore, a pressure switch 12 provided on the pressure tank 9
In order to test the startup operation of the fire pump 1, the pipe 10 is returned to the underground water tank 3 via the electric valve 15. By opening, the pressurizing water in the pressure tank 9 is drained, the pressure of the compressed air in the pressure tank 9 is forcibly lowered, and the pressure switch 12 is turned on, which causes the pump control panel 14 to start the pump. .

FIG. 1 is a block diagram showing an embodiment of the pressure tank inspection device of the present invention intended for the fire pump equipment shown in FIG.

First, to explain the configuration, 16 is an inspection control device installed in a central control room, etc., and inspection control device 1
6 executes a series of inspection processes including pressure tank inspection process under program control by the CPU, for example. For the inspection control device 16, there is a pressure switch 12 installed in the pressure tank 9 of the fire pump equipment shown in FIG. Valve 15 is connected to the signal line.

In addition, the inspection control device 16 is connected by a signal line to a pump control panel 14 of the fire pump equipment, and provides operational data when the fire pump 1 is operated by driving the motor 2 with the pump control panel 14, for example, the voltage of the motor 2. , current, and further operational data such as suction pressure and discharge pressure of the fire pump 1 are obtained.

Furthermore, a pressure switch 12 provided on the pressure tank 9
The output is given to the pump control panel 14, and when the tank pressure drops below the specified pressure and the pressure switch 12 is turned on, the pump control panel 14 starts the motor 2 and starts operating the fire pump 1. I come to do it.

Here, the function of the pressure tank inspection process in the inspection control device 16 is that the pressure switch 12 is turned on by forcibly draining the pressure tank 9 by energizing the electric valve 15, and the pump control panel 14 starts the pump normally. After this, the electric valve 15 is de-energized to stop the forced drainage of the pressure tank 9 and restore the tank pressure, and in the process of recovering the tank pressure, the tank pressure is restored to the specified pressure and the pressure switch 12 is turned off. The switch output when the switch switches from the on state to the off state is determined to determine whether the tank pressure has recovered to the specified pressure. Regarding recovery of the tank pressure, normal tank pressure is recovered when the switch output of the pressure switch 12 is switched from the on state to the off state within a predetermined period of time after the electric valve 15 is closed. As a result, pump stop control is applied to the pump control panel 14.

That is, in the embodiment shown in FIG. 1, a test is carried out in which the inspection control device 16 energizes the electric valve 15 to forcibly discharge the tank pressure to lower the tank pressure, and the pump is started by the switch output of the pressure switch 12. The operating means and the pressure switch 12 indicate that the tank pressure has recovered to the specified pressure prior to stopping the fire pump 1 started by the test operating means.
When the detection output of the recovery pressure detection means, that is, the switch-off output of the pressure switch 12 is obtained within a certain period of time after the electric valve 15 is closed, the recovery of the tank pressure is determined to be normal. and an inspection completion means that determines this and instructs the fire pump 1 to stop control.

Next, refer to the flowchart in Figure 3 and proceed to the first step.
The operation of the pressure tank inspection process in the illustrated embodiment will be described.

First, the inspection control device 16 has an automatic inspection mode and a manual inspection mode, and in the automatic inspection mode, it automatically executes pressure tank inspection processing every time a predetermined inspection cycle is reached. In addition, in the manual mode, the pressure tank inspection process is executed by the operator's switch operation.

When the pressure tank inspection process in the inspection control device 16 is started, the electric valve 1 is first checked in the block 30.
5 is opened, and the pressurized water introduced into the pressure tank 9 is forcibly discharged into the underground water tank 3. The tank pressure in the pressure tank 9 decreases due to the forced drainage caused by the opening of the electric valve 15, and the next judgment block 32 monitors whether the pressure switch 12 is turned on. When the tank pressure drops below the specified pressure, pressure switch 1
2 is switched on, and the process proceeds to the next block 34, where the pump control panel 14 drives the motor 2 to control the activation of the fire pump 1. In this pump start control, the motor 2 is first started with the Y connection, and after a certain period of time, the motor 2 is switched to the Δ connection and the pump starts operating.

When the pump startup control is performed in block 34, the presence or absence of startup is checked in the next judgment block 36. If the startup fails, block 3
At step 8, an abnormality alarm is issued and the inspection process is terminated.

When the start of the pump is confirmed in the judgment block 36, the pump operation is continued for a predetermined period of time in the judgment block 40, and when the certain pump operation time has elapsed, the process proceeds to block 42, where the electric valve 15 is closed and the pressure is reduced. Forced drainage of tank 9 is stopped. By closing this electric valve 15, the pressure water in the pressure tank 9 is restored by the supply of pressurized water by the operation of the fire pump 1, and the next determination block 44
The pump checks whether the pressure switch 12 is turned off within a certain period of time, and if the tank pressure recovers and the pressure switch 12 is turned off within a certain period of time, the process proceeds from judgment block 44 to block 48, where pump stop control is performed. This completes the series of inspection processes.

On the other hand, even after a certain period of time has passed, the pressure switch 12
OFF output, that is, if the tank pressure has not recovered to the specified pressure, the process proceeds from judgment block 44 to block 46 to issue an abnormal alarm, and then judgment block 47 checks whether there is a fire or not. Pump stop control is performed in block 48, and based on the abnormality alarm issued in block 46, the cause of pressure recovery in the pressure tank 9 is not performed normally is investigated, and repair and inspection of the fire pump equipment is performed. Become. Of course, if a fire is determined in the determination block 47, the process is terminated without stopping the pump.

Incidentally, the test process for the pressure tank shown in FIG. 3 comes to be performed as one item of the automatic inspection process for general fire extinguishing equipment as shown in FIG.

That is, the automatic inspection process shown in FIG. 4 is executed every predetermined inspection cycle, and first, in block 50, the inspection items, year, month, date, hour and minute are printed, and then in the next block 5,
At step 2, stationary data before inspection is collected, and at judgment block 54, the stationary data is checked for abnormality. If there is abnormal data, the process proceeds to block 56 to issue an abnormality alarm. If the stationary data is normal, the process proceeds to block 58 and executes the predetermined inspection items, for example, the pressure tank inspection process shown in the flowchart of FIG. 3, and the pump is started normally by forced draining of the pressure tank. If so, a block 60 measures predetermined operating data, such as the voltage and current of the motor 2, as well as the suction pressure and discharge pressure of the fire pump 1, and a judgment block 62 judges whether the operating data is normal or not. , if normal, the process proceeds to block 64 for termination processing. For example, in the case of the pressure tank inspection process shown in FIG. 3, this termination process includes a tank pressure recovery process by closing the electric valve 15 and a pump stop control after the pressure recovery.

Next, a block 66 collects stationary data after the inspection is completed, and a determination block 68 determines the condition.
Finally, in block 70, the inspection items and end time are printed, and the process then proceeds to the next predetermined inspection item.

In the pressure tank inspection device of the present invention shown in FIGS. 1 and 2, the pressure switch 12 is used to restore the tank pressure to the specified pressure.
Detection is performed using the switch-off output of the switch-off output, but the pressure tank 9 may be provided with a dedicated pressure switch for detecting pressure recovery. In addition, the set value for detecting recovery of tank pressure is a pressure higher than the set pressure for starting the pump,
For example, if the pressure to start the pump is 10Kgf/ ^cm2 , the set pressure to detect pressure recovery is 12Kg.
It is desirable to set it to a high value of f/cm ² .

(Effects of the Invention) As explained above, according to the present invention, a water supply pipe that supplies pressurized water to a sprinkler head, etc. is connected to the fire pump discharge side, and pressurized water from the water supply pipe is introduced into a pressure tank. This compressed air is used to maintain the pressure in the water supply pipe above the specified pressure when the pump is stopped.Furthermore, it detects a drop in tank pressure due to the operation of the sprinkler head, etc., and controls the activation of the fire pump. As a pressure tank inspection device for pump equipment, there is a test operation means that forcibly drains the pressurized water in the pressure tank and starts the pump based on the detection output of a pressure switch due to a drop in tank pressure, and a fire pump that is started by this test operation means. Prior to stopping, there is a recovery pressure detection means that detects that the tank pressure has recovered to a specified pressure or more, and if the detection output of the recovery pressure detection means is obtained within a certain period of time, the inspection is determined to be normal and the pump is ordered to stop. Since a termination means is provided, it is possible to check whether or not the tank pressure recovers to the specified pressure or not after stopping forced drainage of the pressure tank after starting the pump due to forced drainage of the pressure tank. By ensuring that the pressure returns to the specified level at the end of the inspection, we can guarantee the reliability of sprinkler head operation in the event of a fire and pump startup based on a drop in tank pressure.

In addition, if the tank pressure does not recover normally after starting the pump due to forced draining of the tank pressure, it can be detected through inspection that the tank pressure has not recovered normally, so the pressure tank can be inspected and repaired immediately. This enables appropriate maintenance and management of fire pump equipment.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing fire pump equipment to be inspected by the present invention, and Fig. 3 is a flowchart showing the inspection process according to the present invention. , FIG. 4 is a flowchart showing automatic inspection processing including inspection processing of the present invention. 1: Fire pump, 2: Motor, 3: Underground water tank,
4: Suction pipe, 5: Gate valve, 6: Main water supply pipe, 7: Branch pipe, 8: Sprinkler head, 9: Pressure tank, 10: Piping, 11: Manual valve, 12: Pressure switch, 13: Pressure gauge, 14: Pump control panel, 1
5: Electric valve, 16: Inspection control device.

Claims (1)

[Claims] 1. A water supply pipe that supplies pressurized water to a sprinkler head installed at the end of the pipe is connected to the discharge side of the fire pump, and the pressurized water from the water supply pipe is introduced into a pressure tank to compress the internal air. , the fire pump equipment is equipped with a pressure switch that uses the compressed air to maintain the pressure in the water supply pipe at a specified pressure when the pump is stopped, detects a drop in tank pressure due to the operation of a sprinkler head, etc., and controls the start of the fire pump. Test control means for forcibly discharging the pressurized water in the pressure tank to lower the tank pressure, starting and operating the fire pump based on the output of the pressure switch, and stopping the forced draining of the tank pressure after the pump operation. and a recovery pressure detection means for detecting recovery of the tank pressure to a specified pressure after the forced tank draining by the test control means is stopped, and when the detection output of the recovery pressure recovery means is obtained within a certain period of time, it is determined to be normal. 1. A pressure tank inspection device for fire pump equipment, characterized by comprising an inspection termination means for making a judgment and instructing the stop of the fire pump.