JPH1015105A - Relay operation control method for portable fire-extinguishing pump and relay operated portable fire-extinguishing pump used for practicing the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control method for relay operation of a portable fire- extinguishing pump, in which when an engine of a portable fire-extinguishing pump in the posterior stage is automatically started by detecting pressure at the pump, whether the pressure rise is caused by hydraulic or pneumatic pressure is judged, and when it is judged due to pneumatic pressure, operation of the pump is automatically stopped. SOLUTION: When a portable fire-extinguishing pump in the anterior stage starts water supply and a pressure sensor 7a on the intake side detects that the pressure within a portable fire-extinguishing pump in the posterior stage has reached to a predetermined level, a water cooling engine of the latter pump is automatically started. After the start, the pressures Ps on the pump input side and Pd on the pump output side are detected by pressure sensors 7a and 7b on the intake and discharge sides, respectively, and when the pressure difference (Pd-Ps) is smaller than a predetermined value, operation of the water cooling engine is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable fire fighting pump provided with a priming pump at a water source, and a portable fire fighting pump at a later stage connected to the portable fire pump at a first stage via a fire hose. The present invention relates to a relay operation control method of a portable fire pump for controlling relay operation of a portable fire pump at the subsequent stage when performing long-distance water supply, and a portable fire pump for relay operation used for carrying out the method. is there.

[0002]

2. Description of the Related Art In a long-distance water supply and digestion activity where a forest fire or a fire site is far from a fire-fighting water supply system, a single portable fire-fighting pump cannot be used because of the frictional resistance of water flowing in a fire hose. Since the amount of water and water pressure required for the activities cannot be obtained, it is customary to connect a plurality of portable fire pumps in series as needed to send water over long distances.

FIG. 3 shows a state in which long-distance water is supplied by a portable fire pump. For this long-distance water supply, a water source 1 is provided with a first stage portable fire fighting pump 2 equipped with a priming pump, and the first stage portable fire fighting pump 2 is connected to a second stage portable fire fighting pump 3a, 3b by a fire hose 4a, 4b, 4c. The portable fire pump 2 at the first stage provided with a priming pump is configured to load the suction pipe 5 into the water source 1 to suck up water. Although this example shows a case in which the number of portable fire pumps in the latter stage is two, there may be one stage, or three or more stages, depending on the distance from the water source 1 to the fire occurrence site. . Fire hose 4a,
The length of 4b is, for example, about 200 m to 800 m.

In this case, the individual portable fire pumps 2, 3
An operator called an engineer operating the a and 3b needs to start or stop the engine of each of the portable fire pumps 2, 3a and 3b in the following procedure (this operation is
Conventionally, it was performed manually.)

[0005] When starting, the portable fire pump 2 is started from the first stage portable fire pump 2, performs a water supply operation, and the second stage portable fire pump 3
a, the third stage portable fire pump 3b and the subsequent portable fire pumps 3a, 3b sequentially start their engines after an engineer determines that water has reached the portable fire pump, Perform water supply operation.

When stopping, contrary to the starting, the portable fire pumps 3a and 3b at the subsequent stage stop the portable fire pump 3b at the third stage, the portable fire pump 3a at the second stage, and the engine sequentially. Finally, the first stage portable fire pump 2 is stopped.

As described above, the portable fire pumps 3a,
3b, the engine is started after the engineer confirms that water has reached the portable fire pump after the engineer confirms that water has reached the portable fire pump. This is because a water-cooled engine system is adopted. The cooling water of such a water-cooled engine is supplied from the high water pressure section of the portable fire pump to the cooling water passage of the water-cooled engine, cools the water-cooled engine, and is then discharged to the outside. I have.

For this reason, if the water-cooled engine of the second stage portable fire pump 3a, for example, is started before water arrives from the first stage portable fire pump 2a, water is supplied to the portable fire pump 3a. Is not able to cool the water-cooled engine, the water-cooled engine overheats,
In the worst case, the water-cooled engine may burn.

Similarly, when the water-cooled engine of the portable fire-fighting pump 2 of the first stage is stopped first,
No water is supplied to the downstream portable fire pumps 3a and 3b. Therefore, if these downstream portable fire pumps 3a and 3b are operated as they are, the water-cooled engine overheats, or in the worst case, the water-cooled water pump is not supplied. The engine may burn.

[0010] However, such relay operation control of the portable fire pump may cause even a trained professional engineer to burn a water-cooled engine due to mishandling at an emergency fire site. It is difficult to always expect correct operation for a fire brigade that cannot receive sufficient training.

Therefore, the present applicant has previously proposed a relay operation control method for a portable fire fighting pump that can carry out long-distance water supply without disposing an engineer in the latter stage of the portable fire fighting pump. This portable firefighting pump relay operation control method is based on a method in which the first stage portable firefighting pump starts water supply and the sensor detects that water reaches a second stage portable firefighting pump and reaches a predetermined water pressure. This is a method of automatically starting the portable fire pump at the latter stage (Japanese Patent Application No. 7-317963).

[0012]

However, this relay operation control method for a portable fire fighting pump uses a pressure sensor as a sensor for detecting that the portable fire fighting pump reaches a subsequent stage and reaches a predetermined water pressure. However, there is a problem that the portable fire pump is automatically started even by the air pressure because it is difficult to distinguish between water and air. In this case, since there is no water in the pump, the cooling water is not supplied to the cooling water passage of the water-cooled engine, and the water-cooled engine may overheat or, in the worst case, burn the water-cooled engine.

This point will be described in detail as follows. When the portable fire pump is to be relayed for long-distance water supply, the portable fire pump is usually 2-3.
In some cases, more than 10 portable fire pumps may be connected in series if the units are connected in series. At this time, the water supply distance may be several km or more, and it may take 10 minutes or more from when the portable fire pump at the first stage starts water supply to when water is discharged at the tip. At the time of this water supply, the second stage portable fire pump had two stages of water than the first stage portable fire pump.
By sequentially supplying water to the three-stage portable fire pumps, the air in the fire hose is also sequentially accumulated at the tip of the flowing water and sent forward. At this time, if water remains in the front hose, the pressure of the air trapped in the hose increases due to the resistance and back pressure of the water. The portable fire pump that exists during this time starts the water-cooled engine by this air pressure and enters the operating state. Since the portable fire pump has no water, cooling water is not supplied to the water-cooled engine, and the portable fire pump may overheat. In the worst case, the water-cooled engine may be burned.

Apart from this, it has also been proposed to start the water-cooled engine of the latter portable fire pump by detecting the arrival of water at the latter portable fire pump by a water sensor.
At the start of operation, there is no water in the whole pump, water cannot be detected depending on the mounting position of the water sensor, and the water-cooled engine cannot be started at an appropriate time.

[0015] An object of the present invention is to determine whether a pressure increase in a pump of a portable fire-fighting pump is caused by water pressure or air pressure when the engine of the pump is automatically started by detecting pressure in the latter stage. The present invention provides a relay operation control method for a portable firefighting pump capable of automatically stopping the operation of the pump when it is determined that the operation is based on air pressure, and a portable firefighting pump for relay operation used for implementing the method. Is to do.

[0016]

According to the present invention, a first stage portable fire fighting pump provided with a priming pump is installed in a water source, and a second stage portable fire fighting pump is connected to the first stage portable fire fighting pump via a fire hose. An object of the present invention is to improve a relay operation control method of a portable fire pump that controls relay operation of a portable fire pump at a later stage when long-distance water supply is performed in series.

[0017] In the relay operation control method for a portable fire fighting pump according to the present invention, the second stage fire fighting pump starts water supply by the first stage fire fighting pump, and water reaches the second stage fire fighting pump. Automatically starts when the sensor detects that the water pressure has reached a predetermined level.After the start, if the pressure difference between the pump inlet side and the pump outlet side exceeds a certain value, the operation is continued. When the pressure difference is smaller than a certain value, the operation is stopped.

As described above, when the pressure difference between the pump inlet side and the pump outlet side is detected, if water is present inside the pump, the water is pressurized to increase the pressure difference, and air is present. In some cases, the pressure difference due to the pressurization of the pump does not increase. Therefore, it is possible to determine whether water or air exists in the pump based on the pressure difference.

For this reason, when the pressure difference between the pump inlet side and the pump outlet side is equal to or more than a certain value, the operation is continued when the pressure difference between the pump inlet side and the pump outlet side is smaller than a certain value. When the operation is stopped, the subsequent portable fire pump can continue the operation only when water is present in the pump, and can prevent overheating and seizure of the water-cooled engine.

A portable fire pump for relay operation according to the present invention includes a water-cooled engine-driven water supply pump driven by a water-cooled engine, a suction-side pressure sensor for detecting a pressure at a pump inlet side of the water-cooled engine-driven water supply pump, A discharge-side pressure sensor that detects the pressure at the pump outlet side of the water-cooled engine-driven water supply pump, an engine starter that automatically starts the water-cooled engine of the water-cooled engine-driven water supply pump, and a water pressure detected by the suction-side pressure sensor. When the set pressure is reached, control is performed to automatically start the water-cooled engine by the engine starting device, and the pump inlet side pressure detected by the suction side pressure sensor and the pump outlet side pressure detected by the discharge side pressure sensor are controlled. If the pressure difference is greater than a certain value, the operation is continued, and if the pressure difference is smaller than a certain value, the operation is continued. Characterized in that it comprises a control unit that performs control for stopping the rotation.

Thus, the suction side pressure sensor for detecting the pressure on the pump inlet side of the water-cooled engine driven water supply pump and the discharge side pressure sensor for detecting the pressure on the pump outlet side of the water cooled engine driven water supply pump are provided. The detection outputs of the suction-side pressure sensor and the discharge-side pressure sensor are input to a control unit, and when the pressure difference, which is the difference between the detection pressures of the two sensors, is equal to or more than a certain value, the operation of the water cooled engine is performed. If the control is continued to stop the operation of the water-cooled engine when the pressure difference is smaller than a certain value, the operation can be continued only when water is present in the pump, and overheating and seizure of the water-cooled engine can be performed. Can be prevented.

[0022]

FIG. 1 shows an example of an embodiment of a portable fire pump for relay operation according to the present invention used as the portable fire pump 3a, 3b in the latter stage described above.

The portable fire pump for relay operation according to the present embodiment detects a water-cooled engine-driven water supply pump 6 composed of, for example, a centrifugal pump driven by a water-cooled engine, and detects a pressure Ps on the pump inlet side of the water-cooled engine-driven water supply pump 6. A suction-side pressure sensor 7a, a discharge-side pressure sensor 7b for detecting a pressure Pd at a pump outlet side of the water-cooled engine-driven water supply pump 6, and a cell motor for automatically starting the water-cooled engine of the water-cooled engine-driven water supply pump 6. Such as an engine starting device 8, an engine stop device 9 for automatically stopping the water-cooled engine by stopping the ignition of an ignition device of the water-cooled engine, and a hydraulic pressure P detected by the suction side pressure sensor 7a.
When s reaches the set pressure, the engine starter 8 performs control to automatically start the water-cooled engine, and the pressure P on the pump inlet side detected by the suction side pressure sensor 7a.
If the pressure difference between the pressure s and the pressure Pd on the pump outlet side detected by the discharge-side pressure sensor 7b is equal to or more than a certain value, the operation is continued. If the pressure difference is smaller than a certain value, the operation is stopped. And a control unit 10 for performing the operation.

The control unit 10 converts an analog signal consisting of the detected pressure signals from the suction-side pressure sensor 7a and the discharge-side pressure sensor 7b into a digital signal (hereinafter, referred to as an A / D converter) 11.
2, a random access memory (hereinafter, referred to as RAM) 12 and a read-only memory (hereinafter, referred to as ROM) 13 for storing a control program, a timer 14, and an A / D converter 11. Output of the water detection sensor 7, the timer 14, the RAM 12, and the ROM
A central processing unit (hereinafter referred to as a CPU) 15 for controlling the water-cooled engine-driven water supply pump 6 by using the CPU 13;
An input / output unit (hereinafter, referred to as I / O) 1 for transmitting an engine start signal from the CPU 15 to the engine start device 8 and transmitting an engine stop signal to the engine stop device 9.
6 is provided. Reference numeral 17 denotes a battery that supplies power to the control unit 10 via the power switch 18.

[0025] Such a portable fire pump for relay operation is as follows.
It is used as the portable fire pump 3a, 3b at the subsequent stage in the relay type long distance water supply device shown in FIG. These portable fire pumps 3a and 3b start to be used with all their water discharge valves open.

Next, a relay operation control method for the portable fire pump 3a when the portable fire pump for relay operation is used as the portable fire pump 3a at the subsequent stage of the relay type long distance water supply device will be described with reference to FIG. 1 and FIG.

First, when the power switch 18 shown in FIG. 1 is turned on, the water-cooled engine-driven water supply pump 6 enters a start state shown in FIG. 2 in a standby state. When the portable fire fighting pump 2 of the first stage equipped with the priming pump is started to start water supply, the portable fire fighting pump 3a of the latter stage detects the pressure Ps on the pump inlet side of the water-cooled engine driven water supply pump 6 on the suction side pressure sensor 7a. , And the pressure Pd at the pump outlet side is detected by the discharge side pressure sensor 7b, and these detection signals are transmitted to the CPU 15 via the A / D converter 11 of the control unit 10.

The CPU 15 monitors the pressure Ps on the pump inlet side and the pressure Pd on the pump outlet side. When the pressure Ps on the pump inlet side becomes equal to or higher than the set pressure P1 (step ST1), the CPU 15 outputs an engine start signal. The signal is transmitted to the engine starting device 8 via the I / O 16, whereby the water-cooled engine of the water-cooled engine driven water supply pump 6 is started (step S).
T2).

When the pressure Ps on the pump inlet side is lower than the set pressure P1, the process returns to the return and continues to monitor the pressure Ps on the pump inlet side.

When the water-cooled engine is started, it is determined whether or not the water-cooled engine is operating (step ST3). When the water-cooled engine is operating, the process proceeds to step ST4, and when the water-cooled engine is not operating, the process proceeds to step ST2. Return.

In step ST4, the pressure difference (Pd-P) between the pressure Ps on the pump inlet side and the pressure Pd on the pump outlet side is determined.
It is determined whether or not s) is equal to or greater than the set value P2.

When the pressure difference (Pd-Ps) between the pressure Ps on the pump inlet side and the pressure Pd on the pump outlet side is equal to or greater than the set value P2, that is, when it is determined that water is present in the water-cooled engine driven water supply pump 6. The process proceeds to step ST5, and when it is determined that there is no water in the water-cooled engine driven water supply pump 6, the process proceeds to step ST6.

In step ST5, it is determined whether or not the pressure Ps on the pump inlet side is equal to or lower than the set pressure P3. If it is determined that the pressure Ps on the pump inlet side is equal to or lower than the set pressure P3, the process proceeds to step ST7. Inlet pressure P
It is determined whether or not the time during which s is equal to or less than the set pressure P3 has exceeded the set time. If the time has exceeded the set time, an engine stop signal is transmitted from the CPU 15 to the engine stop device 9 via the I / O 16, and the water-cooled engine drive water supply is performed. The water-cooled engine of the pump 6 is stopped (step ST8).

At step ST5, the pressure Ps on the pump inlet side
Is determined not to be equal to or lower than the set pressure P3, and when the time during which the pressure Ps on the pump inlet side is equal to or lower than the set pressure P3 does not exceed the set time in step ST7, the process returns to step ST5 and the operation of the water-cooled engine is continued. . Here, the pressure relationship between P1, P2 and P3 is P1> P3
> P2.

On the other hand, in step ST4, the pressure difference (Pd−Pd) between the pressure Ps on the pump inlet side and the pressure Pd on the pump outlet side.
When it is determined that Ps) is not equal to or greater than the set value P2, that is, when it is determined that there is no water in the water-cooled engine driven water supply pump 6 and there is air, and the process proceeds to step ST6, the pressure Ps on the pump inlet side is determined in step ST6. And the pressure Pd at the pump outlet
It is determined whether or not the time during which the pressure difference (Pd-Ps) is not greater than or equal to the set value P2 exceeds the set time.

At step ST6, the pressure P on the pump inlet side
pressure difference (Pd-Ps) between s and the pressure Pd on the pump outlet side
When it is determined that the time that is not equal to or greater than the set value P2 has exceeded the set time, the process proceeds to step ST9, where an engine stop signal is transmitted from the CPU 15 to the engine stop device 9 via the I / O 16, and the water-cooled engine of the water-cooled engine driven water supply pump 6 is stopped. Is done.

When the water-cooled engine is stopped, step S
Proceed to T10, wait for the set time, return to return,
The pressure Ps on the pump inlet side is continuously monitored. When the water-cooled engine is stopped for a certain period of time (for example, about 60 seconds) after stopping the operation of the water-cooled engine, the water-cooled engine is frequently restarted when the water-cooled engine is started by air pressure. Can be avoided.

In step ST6, the pressure P on the pump inlet side
pressure difference (Pd-Ps) between s and the pressure Pd on the pump outlet side
If it is determined that the time not exceeding the set value P2 does not exceed the set time, the process returns to step ST3.

As described above, the fact that the portable fire pump 2 at the first stage starts water supply and the water reaches the portable fire pumps 3a, 3b,. The water-cooled engine is automatically started when detected by the sensor 7a, and after the start, the portable fire pump 3
The pressures on the pump inlet side and the pump outlet side are detected by the suction side pressure sensor 7a and the discharge side pressure sensor 7b, and the pump inlet side pressure Ps and the pump outlet side pressure Pd
The operation of the water-cooled engine is continued when the pressure difference (Pd-Ps) is equal to or more than the set value P2, and the operation of the water-cooled engine is stopped when the pressure difference is smaller than a certain value. The operation can be continued only when water is present, and overheating and seizure of the water-cooled engine can be prevented.

In this example, the portable fire fighting pump in the latter stage is 2
Although the case of a stage is shown, it is needless to say that there may be one stage or three or more stages depending on the distance from the water source 1 to the fire occurrence site.

The water supply pump 6 is not limited to a centrifugal pump, but may be an axial flow pump, a reciprocating pump, a rotary pump, or the like.

Hereinafter, constituent elements of some of the plurality of inventions described in the present specification will be described.

(1) A first-stage portable fire-fighting pump provided with a priming pump at a water source is installed, and a second-stage portable fire-fighting pump is connected to the first-stage portable fire-fighting pump via a fire hose in series for long-distance water supply. When performing, in the relay operation control method of the portable firefighting pump to control the relay operation of the portable firefighting pump of the subsequent stage, the portable firefighting pump of the latter stage, the portable firefighting pump of the first stage starts water supply When the water reaches the portable fire fighting pump at the subsequent stage and reaches a predetermined water pressure by a sensor, the water is automatically started, and after the start, there is a pressure difference between the pump inlet side and the pump outlet side. When the pressure difference is equal to or more than a certain value, the operation is continued, and when the pressure difference is smaller than the certain value, the operation is stopped, and the restart of the portable fire pump is stopped for a certain time. Operation control method.

(2) A water-cooled engine-driven water supply pump driven by a water-cooled engine, a suction-side pressure sensor for detecting a pressure at a pump inlet side of the water-cooled engine-driven water supply pump, and a pump outlet side of the water-cooled engine-driven water supply pump. A discharge-side pressure sensor that detects the pressure of the water-cooled engine, a water-cooled engine-driven water supply pump, an engine starter that automatically starts the water-cooled engine, and, when the water pressure detected by the suction-side pressure sensor reaches a set pressure, An engine starter controls the water-cooled engine to start automatically and there is a pressure difference between the pressure on the pump inlet side detected by the suction side pressure sensor and the pressure on the pump outlet side detected by the discharge side pressure sensor. When the pressure difference is equal to or more than a certain value, the operation is continued. The rolling stops, there relay operation for Nomadic fire pump, characterized in that a control unit for controlling forego certain time restart.

[0045]

In the relay operation control method for a portable fire fighting pump according to the present invention, the portable fire fighting pump in the latter stage is used to start water supply from the first stage fire pump, and water is supplied to the latter stage. Automatically starts when the sensor detects that the water pressure has reached the predetermined water pressure, and if the pressure difference between the pump inlet side and the pump outlet side exceeds a certain value after the start, the operation is started. If the pressure difference is smaller than a certain value, the operation is stopped, so that the portable fire pump at the subsequent stage can continue the operation only when water is present in the pump, and overheat the water-cooled engine. And seizure can be prevented.

The portable fire pump for relay operation according to the present invention includes a suction-side pressure sensor for detecting a pressure at a pump inlet side of a water-cooled engine-driven water supply pump, and a pressure at a pump outlet side of the water-cooled engine-driven water supply pump. And a detection output of the suction-side pressure sensor and a detection output of the discharge-side pressure sensor are input to a control unit. In the case of, the operation of the water-cooled engine is continued, and if the pressure difference is smaller than a certain value, the control of stopping the operation of the water-cooled engine is performed, so that the operation can be continued only when water exists in the pump. Thus, overheating and seizure of the water-cooled engine can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a main configuration of an example of an embodiment of a portable fire pump for relay operation according to the present invention.

FIG. 2 is a flowchart showing a control operation of FIG.

FIG. 3 is an explanatory diagram of a relay type long distance water supply device using a portable fire pump.

[Explanation of symbols]

Reference Signs List 1 Water source 2 First stage portable fire pump 3a, 3b Second stage portable fire pump 4a, 4b, 4c Fire hose 5 Suction pipe 6 Water-cooled engine driven water supply pump 7a Suction side pressure sensor 7b Discharge side pressure sensor 8 Engine starter 9 Engine stop Apparatus 10 Control unit 11 Analog / digital converter (A / D converter) 12 Random access memory (RAM) 13 Read-only memory (ROM) 14 Timer 15 Central processing unit (CPU) 16 Input / output unit (I / O) 17 Battery 18 Power switch

Claims (2)

[Claims] 1. A first stage portable fire fighting pump provided with a priming pump in a water source, and a second stage portable fire fighting pump is connected in series to the first stage portable fire fighting pump via a fire hose to supply water over a long distance. When performing, the relay operation control method of the portable fire fighting pump for controlling the relay operation of the portable fire fighting pump of the subsequent stage, the portable fire fighting pump of the subsequent stage, the portable fire fighting pump of the first stage starts water supply, the water Automatically starts when the sensor reaches the portable fire pump at the latter stage and reaches a predetermined water pressure by a sensor, and after the start, the pressure difference between the pump inlet side and the pump outlet side is constant. A relay operation control method for a portable fire pump, wherein the operation is continued when the pressure difference is equal to or more than the predetermined value, and the operation is stopped when the pressure difference is smaller than the certain value. 2. A water-cooled engine driven feed pump driven by a water-cooled engine, a suction-side pressure sensor for detecting a pressure at a pump inlet side of the water-cooled engine driven feed pump, and a pump outlet side of the water-cooled engine driven feed pump. A discharge-side pressure sensor for detecting pressure, an engine starter for automatically starting the water-cooled engine of the water-cooled engine-driven water supply pump, and the engine when the water pressure detected by the suction-side pressure sensor reaches a set pressure. The starter controls the water-cooled engine to start automatically, and the pressure difference between the pressure on the pump inlet side detected by the suction side pressure sensor and the pressure on the pump outlet side detected by the discharge side pressure sensor is constant. If the pressure difference is smaller than the certain value, the operation is continued. A portable fire pump for relay operation, comprising: a control unit that performs control to stop the pump.