JP2001218862A - Ultra high pressure fire extinguishing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultra high pressure fire extinguishing device capable of being operated with stable spouting performance when an engine PTO shaft of a motive power unit such as a fire-fighting vehicle, a rescue operation vehicle is utilized as a power source. SOLUTION: Engine PTO shafts 1b, 1c of the motive power unit are used as a power source of a high pressure pump 21, a pressure adjusting valve 25 and a reflux path 31 circulating from the pressure adjusting valve 25 to an intake side of the high-pressure pump 21 are mounted on the way of a water feed path from the high pressure pump 21 to a spouting nozzle 27, and the feed water is divided to the return path 31 in accordance with the magnitude of the internal pressure when the internal pressure in the water feed path is over an allowable value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-high pressure fire extinguisher and, more particularly, to an ultra-high pressure fire extinguisher which is driven by a PTO shaft of a power vehicle such as a fire engine or a rescue work vehicle.

[0002]

2. Description of the Related Art An ultra-high pressure fire extinguishing system uses about 9.8 M of fire extinguishing water.
Pressurizing to an ultra-high pressure of Pa (about 100 kgf / cm ² ) or more and injecting from a nozzle, the particle size is 30 to 300 μm
This is a new fire extinguishing system that extinguishes fire in the form of mist droplets. A small amount of water is provided by the cooling effect of absorbing heat of vaporization and the oxygen blocking effect (suffocation effect) by steaming by extinguishing water in the form of mist. There is a feature that can extinguish fire efficiently. Therefore, it is particularly useful for initial firefighting and for extinguishing small and medium fires.

In general, the operation of an ultra-high pressure fire extinguishing system is such that a high pressure pump for supplying water is driven by a dedicated engine (internal combustion engine). However, since the engine is heavy, it takes time to transport the ultra-high-pressure fire extinguishing system, which causes the inherent fire-extinguishing function to be insufficient.

As a solution to the above problem, for example, a PTO shaft (power take-off shaft) of an engine mounted on a power vehicle such as a fire truck, a rescue work vehicle, or another vehicle dispatched to a fire site is used. Conceivable. However, since the engine PTO shaft of these power vehicles is for driving a fire pump, a generator, and the like, which are the original equipment of the power vehicle, the power taken out from the PTO shaft is a fire pump, a generator, or the like. And the like, and if it is used as a drive source of the ultra-high pressure fire extinguishing device, there arises a problem that the performance of the ultra-high pressure fire extinguishing device is not stable.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to perform operation with stable injection performance even when an engine PTO shaft of a power vehicle such as a fire engine or a rescue vehicle is used as a power source. An object of the present invention is to provide an ultra-high pressure fire extinguishing device.

[0006]

An ultrahigh-pressure fire extinguishing system according to the present invention uses an engine PTO shaft of a motor vehicle as a power source of a high-pressure pump, and includes a pressure regulating valve in a water supply passage from the high-pressure pump to an injection nozzle. A return path is provided from the pressure control valve to the suction side of the high-pressure pump, and when the internal pressure of the water supply path exceeds an allowable value, water is supplied to the return path according to the magnitude of the internal pressure. This is characterized in that the flow is divided.

[0007] As described above, since the pressure regulating valve for recirculating a part of the feedwater to the suction side of the high-pressure pump is provided in the water supply passage between the high-pressure pump and the injection nozzle, the high-pressure pump is driven by the fluctuation of the output of the PTO shaft. Even if the pressure fluctuates, the pressure regulating valve recirculates a part of the supply water to the high-pressure pump side, thereby stabilizing the flow rate to the injection nozzle, and always performing an operation with stable injection performance.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 1, reference numeral 1 denotes an engine (internal combustion engine) mounted on a fire engine, which is provided with a PTO shaft 1a for directly extracting full power from a crankshaft and a PTO shaft 1b for extracting deceleration power from a transmission. I have. Of these two PTO shafts, the PTO shaft 1a is connected to a water discharge pump 2 for a fire engine via a clutch (not shown), and the PTO shaft 1b is connected to the ultrahigh-pressure fire extinguishing system 1 of the present invention.
One high-pressure pump 21 is connected via a clutch (not shown).

In general, a water discharge pump 2 for a fire engine requires a large volume of water to be discharged, and a spiral pump or the like is used. In addition, the water discharge pump 2 is connected to a full-power PTO shaft 1a for high-speed rotation. On the other hand, the high-pressure pump 21 for the ultra-high-pressure fire extinguisher 11 uses a plunger pump or a gear pump to generate an ultra-high pressure, and needs to be driven with a high torque.
b. The driving source of the high-pressure pump 21 is a PTO shaft 1c that is decelerated from a full-power PTO shaft 1a via pulleys 40 and 41 and a belt 42, as in the embodiment of FIG.
Or the pulleys 40, 41 for deceleration may be used.
The belt 42 may be replaced with a gear group.

The ultrahigh-pressure fire extinguisher 11 is constructed so as to be surrounded by a broken line in the figure, a high-pressure pump 21 is connected to a water tank 23 via a suction pipe 22, and a pressure is applied to a discharge pipe 24 at the tip thereof. A regulating valve 25 is attached, a hose 26 is connected to the pressure regulating valve 25, and an injection nozzle 27 is attached to the tip. The hose 26 is wound around a reel 28 in a laminated manner so that only a required length can be extended from the reel 28.

The injection nozzle 27 has two nozzles 27.
The nozzles 27a and 27b are provided in a bifurcated manner so that fire-extinguishing water is jetted from the nozzle 27a and foam extinguishing agent is jetted from the nozzle 27b. The injection nozzle 27 has a built-in opening / closing valve, and the nozzle is opened and closed by operating a trigger 27c or a switch (not shown). The positions of the two nozzles 27a and 27b are alternately switched between the upper side and the lower side via the switching valve 45, and the nozzles 27a and 27b emit when the upper side is located and stop when the lower side is located.

A water tank 2 is provided on the suction side of the high-pressure pump 21.
In addition to 3, a chemical tank 29 storing a foam is connected via an on-off valve 30. The on-off valve 30 is linked with the switching valve 45 of the injection nozzle 27, and the switching valve 45
Thus, the valve is opened when the nozzle 27b is switched to the upper position.

A reflux pipe 31 connected to the suction side of the high-pressure pump 21 branches from a pressure regulating valve 25 provided between the discharge pipe 24 and the hose 25. Further, a temperature control valve 32 is attached in the middle of the reflux pipe 31. The temperature control valve 32 increases the cross-sectional area of the flow path when the water temperature rises due to the occurrence of the abnormal internal pressure, and prevents the performance of the high-pressure pump 21 from decreasing by returning the rise temperature to normal.

As shown in FIG. 3, the pressure regulating valve 25 is provided with check valves 35 and 36 in the main flow path on the hose 26 side and the branch path on the return pipe 31 side, respectively.
5 and 36 are urged by springs 35a and 36a. The strength (biasing force) of the spring 36a of the check valve 36 can be adjusted by changing the screwing position of the adjusting nut 37. The check valve 36 is provided with a differential piston 38 that slides in a cylinder 39, and the cylinder 39 is connected to a discharge side 40 (hose 26 side) of the check valve 35 via a communication pipe 41. To contact you.

In the ultrahigh-pressure fire extinguisher 11 described above, the high-pressure pump 21 sucks out the fire-extinguishing water from the water tank 23, discharges it to the discharge pipe 24 at an ultrahigh pressure of about 9.8 MPa (100 kgf / cm ² ) or more. Check valve 35 of regulating valve 25
Is opened and the pressure is fed to the injection nozzle 27,
And sprayed in the form of mist with a particle size of about 30 to 300 μm.
When the fire-fighting water in the form of mist covers the flame, the fire is extinguished by the cooling effect of absorbing heat of vaporization and the oxygen blocking effect (suffocation effect) by steaming, and the fire is efficiently extinguished with a small amount of water.

While the water discharge pump 2 of the fire engine is not yet in operation, a sufficiently high output can be obtained from the PTO shaft 1b (or 1c), and the high-pressure pump 21 pumps fire-fighting water at a high discharge pressure. I do. Therefore, the pressure regulating valve 25 applies a pressure exceeding the set pressure of the check valve 35 to the differential piston 38 in the cylinder 39 through the communication pipe 41 to open the check valve 36 and to remove one of the fire extinguishing water. The part is diverted to the return path 31. The set pressure of the check valve 35 is maintained by the split flow of the fire-extinguishing water, and stable injection can be performed from the injection nozzle 27.

When the injection is stopped by closing the on-off valve of the injection nozzle 27, the check valves 35 and 36 are fully opened, so that the entire amount of fire extinguishing water discharged from the high-pressure pump 21 is supplied to the recirculation path 31. Can be circulated.

On the other hand, when the water discharge pump 2 is activated and the load on the engine 1 increases, the PTO shaft 1b (or 1
The output from c) decreases, and the discharge pressure of the high-pressure pump 21 also decreases. When the discharge pressure decreases in this manner, the differential piston 38 rises in accordance with the amount of the decrease, and the check valve 36 is throttled. Is always kept stable.

FIG. 4 shows an example in which the ultrahigh-pressure fire extinguisher of the present invention is driven by the engine PTO shaft of a rescue work vehicle.

The full power P of the engine 1 'of the rescue work vehicle
A generator 2 for supplying electric power to a power tool, a projector, and the like is connected to the TO shaft 1a via a clutch (not shown), and a hydraulic pump 3 is also connected to the PTO shaft 1b, which has been decelerated by the transmission, using a clutch (not shown). )). The hydraulic circuit in which the hydraulic pump 3 circulates hydraulic oil drives hydraulic equipment such as winches, cranes, and jacks, and further drives the ultrahigh-pressure fire extinguisher 11 of the present invention. That is, the ultra-high pressure fire extinguisher 11
Although the TO shaft 1b is a driving source, it is not directly connected but driven indirectly.

In the hydraulic circuit of the oil pump 3 illustrated in FIG. 4, the oil pump 3 supplies hydraulic oil from the oil storage tank 13 to the return pipe 5.
And is discharged from the supply pipe 4 and supplied to the switching valve 7 via the relief valve 6 and the supply pipe 4a. The switching valve 7 selectively switches the flow path to three supply pipes 8, 9, and 10, switches the supply pipe 8 to a winch (not shown), and switches the supply pipe 9 to the flow control valve 14 and the supply pipe 9a. The supply pipe 10 is supplied to a crane (not shown) through the flow control valve 15 and the supply pipe 10a to the ultrahigh-pressure fire extinguisher 11 of the present invention. Ultra-high pressure fire extinguisher 1
In 1, the hydraulic motor 20 is driven by the hydraulic oil, and the high-pressure pump 21 is driven by the hydraulic motor 20.

A part of the hydraulic oil overflows from the relief valve 6 through the branch pipe 4b into the manifold 16, and the excess hydraulic oil flows into the manifold 16 from the flow control valve 14 through the recirculation pipe 17b. 17a through the flow control valve 1
Supply to 4. The hydraulic fluid is recirculated from the winch via the recirculation pipe 8a.

The flow regulating valve 15 into which the hydraulic oil flows from the supply pipe 10 also flows from the manifold 16 via the supply pipe 18a. Further, excess drain is returned from the set flow rate to the manifold 16 via the reflux pipe 18b, and the supply pipe 10a
To make the flow rate to the hydraulic motor 20 constant.

Therefore, in the embodiment of FIG. 4, the high-pressure pump 21 of the ultrahigh-pressure fire extinguishing apparatus 11 is stabilized by the flow regulating valve 15 and also controlled by the flow regulating valve 25 provided in the ultrahigh-pressure fire extinguishing apparatus 11. Injection from the injection nozzle 27 can be stabilized as in the embodiments of FIGS.

In the embodiment shown in the above-mentioned figures, the case where the engine PTO shaft of the fire engine and the engine PTO shaft of the rescue work vehicle are used as the power source has been described. However, the present invention is not limited to these power vehicles. Instead, all types of motor vehicles that go to the scene of a fire are available. For example,
Water tank vehicles, as power vehicles for the above fire trucks and rescue work vehicles,
Chemical vehicles, ladder vehicles, advanced command vehicles, air-filled vehicles, material transport vehicles and the like can be mentioned.

[0027]

As described above, according to the present invention, a pressure regulating valve is provided in the water supply passage between the high-pressure pump and the injection nozzle so that a part of the water supply flows back to the suction side of the high-pressure pump.
Even if the driving of the high-pressure pump fluctuates due to the fluctuation of the output of the TO shaft, the pressure regulating valve recirculates a part of the water supply to the high-pressure pump side, thereby stabilizing the flow rate to the injection nozzle and constantly stabilizing the injection performance. Can be done.

[Brief description of the drawings]

FIG. 1 is a schematic view exemplifying a case where an engine PTO shaft of a fire engine is used as a power source of an ultra-high pressure fire extinguisher according to the present invention.

FIG. 2 is a schematic view showing another example in which an engine PTO shaft of a fire engine is used as a power source of the ultrahigh-pressure fire extinguishing system of the present invention.

FIG. 3 is a schematic vertical sectional view showing an example of a pressure regulating valve used in the present invention.

FIG. 4 is a schematic view illustrating a case where an engine PTO shaft of a rescue work vehicle is used as a power source of the ultrahigh-pressure fire extinguishing apparatus of the present invention.

[Explanation of symbols]

 1, 1 'Engine 1a, 1b, 1c PTO shaft 21 High pressure pump 22 Suction pipe 23 Water tank 24 Discharge pipe (water supply channel) 25 Pressure regulating valve 26 Hose 27 Injection nozzle 27a, 27b Nozzle 28 Reel 31 Recirculation pipe

Claims (4)

[Claims] An engine PTO shaft of a motor vehicle is used as a power source of a high-pressure pump, and a pressure regulating valve is provided in the middle of a water supply passage from the high-pressure pump to an injection nozzle, and the pressure is returned from the pressure regulating valve to a suction side of the high-pressure pump. An ultra-high pressure fire extinguisher in which a return path is provided, and the pressure regulating valve is configured to divide water supply into the return path according to the magnitude of the internal pressure when the internal pressure of the water supply path exceeds an allowable value. 2. The ultra-high pressure fire extinguisher according to claim 1, wherein the high pressure pump is a plunger pump or a gear pump. 3. The ultra-high pressure fire extinguisher according to claim 1, wherein the injection nozzle is provided with an on-off valve for performing injection / stop. 4. The ultrahigh-pressure fire extinguisher according to claim 1, wherein the power vehicle is a fire engine or a rescue work vehicle.