JP2004097720A - Hydraulic drive type high pressure extinguisher system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for effectively utilizing a fire extinguishing pump and a high pressure water pump simultaneously. <P>SOLUTION: The engine 1 of a firetruck is shared as a driving source. A T/MPTO 2, a variable capacity type hydraulic pump 3, and a hydraulic motor 4, etc., are arranged between the engine 1 and the high pressure water pump 5, so as not to give the influence of the rotation number of the engine on mutual pump performance. The variable capacity type hydraulic pump performs control by fixed pressure and fixed flow rate regardless of the input rotation number of the engine. Consequently, the fixed rotation is kept in the hydraulic motor, so that a required water discharge amount, and its pressure, etc., are controlled in the high pressure pump. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for driving a high-pressure water pump mounted on a fire engine by sharing a drive source with the fire pump and providing a variable displacement hydraulic pump and a hydraulic motor. It is about.
[0002]
2. Description of the Related Art Conventionally, a method of directly driving a high-pressure water pump from an engine of a fire engine has been adopted. Alternatively, a unitized system dedicated to a high-pressure water pump was loaded.
[0003]
The direct drive method and the unitized system have the following drawbacks.
(A) In the case of the direct drive method The fire pump and the high-pressure water pump share the engine of the fire engine as a drive source. Therefore, when it is desired to use pumps having different characteristics at the same time, the pump performance is affected by the number of revolutions of the engine, so that the original water discharge performance cannot be obtained at the same time, and only one of them has to be used.
(B) When a unitized system is mounted, the equipment of the fire engine itself is duplicated, which makes it difficult to increase the weight and secure a loading space. In addition, operability was degraded due to limited equipment positions.
The present invention has been made to solve these disadvantages.
[0004]
In order to solve this problem, the present invention shares the engine of a fire engine as a drive source when a fire pump and a high-pressure water pump mounted on the fire engine are used simultaneously. A T / MPTO, a variable displacement hydraulic pump, a hydraulic motor, and the like were provided between the engine of the fire engine and the high-pressure water pump so that the rotation speeds of the pumps did not affect each other's pump performance. A directional control valve capable of bypassing the hydraulic motor is provided in a flow path on the secondary side of the variable displacement hydraulic pump and the primary side of the hydraulic motor. An oil tank for storing oil serving as a medium for transmitting power is provided in a flow path on the primary side of the positive displacement hydraulic pump.
[0005]
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic diagram of the system. In FIG. 1, power from an engine 1 of a fire engine is transmitted to a variable displacement hydraulic pump 3 via a T / MPTO 2. The hydraulic motor 4 is driven by the hydraulic pressure generated by the variable displacement hydraulic pump 3, and the high-pressure water pump 5 is operated by the hydraulic motor 4.
Next, FIG. 2 shows a schematic view of the internal structure of a fire engine including the system. The variable displacement hydraulic pump 3 can control a constant pressure and a constant flow rate irrespective of the input rotation speed of the engine. The hydraulic motor 4 can maintain a constant rotation even if the pressure is changed at random, and the high-pressure water pump 5 can discharge water at a required water amount and pressure according to the situation at that time.
A directional control valve 7 is provided in a flow path on the secondary side of the variable displacement hydraulic pump 3 and the primary side of the hydraulic motor 4, and an oil serving as a medium for transmitting power is provided on the secondary side of the hydraulic motor 4. Is provided with an oil tank 8 in which is stored. Then, the flow path from the direction control valve 7 is branched into a flow path connected to the hydraulic motor 4 and a flow path bypassing the hydraulic motor 4 and directly entering the oil tank 8. The oil flows from the oil tank 8 to the primary side of the variable displacement hydraulic pump 3 so as to circulate throughout the entire flow.
As a result, the directional control valve 7 is switched only when the operation of the high-pressure water pump 5 is necessary, and the hydraulic motor 4 is driven. That is, as shown in FIG. 3, the flow of the oil can be circulated from the directional control valve 7 to the oil tank 8, the variable displacement hydraulic pump 3 and the directional control valve 7, so that the temperature rise of the oil can be suppressed.
Moreover, when it is desired to use the high-pressure water pump 5, it is possible to quickly respond only by switching the direction control valve 7.
As an operation procedure, the direction control valve 7 is switched by operating a switch of an operation section 10a of the control panel 9, and the high-pressure pump 5 is operated and stopped. The water source of the high-pressure pump 5 is supplied from a water tank 11 described in a fire engine for the fire pump 6. An electric ball cock 12 controlled by the control panel 9 is provided between the water tank 11 and the water suction side of the high-pressure pump 5. The electric ball cock 12 is automatically operated in conjunction with a switch operation of the operation unit 10b. The water is supplied to the high-pressure pump 5 after the opening and closing, and the water is discharged from the high-pressure water nozzle 13.
[0011]
【The invention's effect】
As described above, according to the present invention, by installing a variable displacement hydraulic pump, a pump performance independent of the engine speed of a fire engine can be obtained. It can respond effectively to fire with radiation from a small amount of high pressure spray.
Further, unlike the case of installing the high-pressure water pump unit, there is no duplication with the device of the fire engine itself, and it is possible to obtain a lighter weight and improved operability. Since the variable displacement hydraulic pump and the hydraulic motor are connected by a hose, the degree of freedom of the installation location is wide.
Furthermore, by the collective operation of the operation unit, the preparation time for fire extinguishing at the fire site is reduced, and the fire extinguishing activity can be started promptly.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a system using a variable displacement hydraulic pump according to an embodiment of the present invention. FIG. 2 is a schematic diagram of an internal structure of a fire engine including the present invention. FIG. Schematic diagram of oil flow during loading [Explanation of symbols]
1 Fire engine 2 T / MPTO
3 Variable displacement hydraulic pump 4 Hydraulic motor 5 High pressure water pump 6 Fire pump 7 Directional control valve 8 Oil tank 9 Control panel 10a, 10b Operation unit 11 Water tank 12 Electric ball cock 13 High pressure water nozzle

Claims (2)

By sharing the engine of the fire engine as a drive source and providing a variable displacement hydraulic pump, etc., the required water discharge amount, water discharge pressure, etc. can be controlled to a constant value. system. By providing a directional control valve between the variable displacement hydraulic pump and the hydraulic motor, the directional control valve is branched into a flow path that connects to the hydraulic motor and a flow path that bypasses the hydraulic motor. The directional control valve is switched only when necessary, the hydraulic motor is driven, and in a standby state, the unload flow path does not apply a load to the hydraulic motor, so that a rise in oil temperature in the oil tank can be suppressed. System described in

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