JP2004275210A - Cooling unit at the time of pump operation in fire vehicle pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the overheat of a cooled device such as a subordinate radiator attached to a fire pump at the time of spraying water from the fire pump for extinguishing a fire by a fire engine without discharging water to be sprayed from the fire pump to the ground out of the vehicle even if the pressure on the suction side of the fire pump is high. <P>SOLUTION: The cooling unit comprises a spray water circulation tube 13 for circulating part of water sprayed from the fire pump to a water intake 11 of the fire pump when the fire pump 10 is operated, a heat exchanger 14 with water flowing in the spray water circulation tube as a coolant, and a cooling water circulation tube 15 to which water is fed by a water pump for cooling cooled devices 19 and 20. Further, a part 15' of the cooling water circulation tube is made to pierce into the heat exchanger 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device to be cooled, for example, a sub-radiator, an engine PTO (engine for driving a fire pump) when a fire pump of a fire pump vehicle (hereinafter simply referred to as a fire pump vehicle) is operating for water discharge. The present invention relates to a cooling device at the time of operation of a pump in a fire-fighting pump car which circulates cooling water for preventing overheating such as a power take-out device without draining to a road outside the vehicle.
[0002]
[Prior art]
Fire pump trucks use the part of the water discharged by the operation of the fire pump to cool the equipment to be cooled, and circulate the cooled water from the cooling water pipe to the suction port of the fire pump. A cooling device at the time of operating a pump is known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-87409 A (paragraphs [0011] to [0025], FIGS. 1 and 2)
[0004]
[Problems to be solved by the invention]
In the device of Patent Document 1, when the water supplied to the water inlet of the fire pump is a fire hydrant or water discharged from another fire pump car and the pressure on the suction side of the fire pump increases, the cooling water pipe is It is necessary to operate the three-way switching cock provided downstream of the equipment to be cooled to drain water to the road surface outside the vehicle, so that the road surface becomes slippery or holes are dug in the road surface with water pressure, Firefighting activities were sometimes hindered.
[0005]
[Means for Solving the Problems]
According to the present invention, even when the water supplied to the water inlet of the fire pump is a fire hydrant or water discharged from another fire pump car and the pressure on the suction side of the fire pump increases, the water is drained to a road surface outside the car. The fire-fighting pump car cooling device according to claim 1 is characterized in that a part of the fire-fighting pump discharge water is circulated to the fire-fighting pump suction port when the fire-fighting pump operates. A water circulation pipe, a heat exchanger that uses water flowing through the discharge water circulation pipe as a refrigerant, and a cooling water circulation pipe that is fed by a water pump to cool a device to be cooled, and that a part of the cooling water circulation pipe It is characterized by being penetrated inside the exchanger. In this case, it is preferable that the pressure resistance of the heat exchanger be equal to or higher than the pressure resistance of the fire pump, and that the water pump be selected so that the pressure does not increase more than the pressure resistance of the equipment to be cooled.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a flow sheet showing an embodiment of the present invention. Reference numeral 10 denotes a fire pump mounted on a fire engine. As is well known, a water absorption pipe 11L having a T-shape and having a tip directed to the left and right sides of the vehicle body. A water inlet 11 having an inlet 11R and a discharge outlet 12 having outlet pipes 12L and 12R whose tips are directed to the left and right sides of the vehicle body are similarly provided. The water absorption pipes 11L and 11R are provided with a water absorption pipe 11-1 for receiving pressurized water from a fire hydrant or a discharge port of another fire engine, and a water absorption pipe 11- for sucking water of the same atmospheric pressure as a pond or water for fire extinguishing. 2 Each of the discharge pipes 12L and 12R has a plurality of branch pipes 12 'for connecting a discharge hose or the like having a discharge nozzle attached to the tip. Each of the pipes 11-1, 11-2, and 12 'is provided with a valve for opening and closing at the tip.
[0007]
The discharge port 12 is provided with a discharge water circulation pipe 13 for taking out a part of the discharge water and returning the discharge water to the water intake port 11 when the fire pump 10 operates.
[0008]
A heat exchanger 14 for cooling the discharge water flowing through the discharge water circulation pipe 13 is connected in the middle of the discharge water circulation pipe 13.
[0009]
Further, the vehicle body has a reservoir tank 16, a running water switch 17, and a water pump 18, and it is necessary to prevent the cooling water in the reservoir tank from being overheated during operation of the fire pump when the water pump is operated. A cooling water circulating pipe 15 for passing water through the cooling devices 19 and 20 is provided, and a part 15 ′ of the cooling water circulating pipe 15 passes through the inside of the heat exchanger 14 and passes from the discharge water circulating pipe 13 to the heat exchanger The heat is exchanged with the discharge water as the refrigerant flowing through the cooling medium 14 to be cooled and circulated.
[0010]
In the illustrated embodiment, the equipment to be cooled 19 is a sub-radiator, 20 is a transmission (engine PTO) for transmitting the power of the engine of the vehicle body to the fire pump, and the cooling water passes through the cooling circuit 21 of the sub-radiator and the transmission. Flowing.
[0011]
When the fire pump truck arrives at the fire site and stops, the power of the engine is switched to discharge water to the fire, and transmitted to the fire pump 10 via the transmission 20, the water pump 18 is driven by this power.
Note that the water pump 18 may be driven by a motor or the like.
[0012]
Thereby, the cooling water stored in the reservoir tank 16 flows through the cooling water circulation pipe 15 by the water pump 18, passes through the cooling circuit 21 of the sub radiator and the transmission, and prevents the sub radiator and the transmission (device to be cooled) from overheating. The cooling water heated at this time exchanges heat with the discharge water flowing as a refrigerant in the heat exchanger when passing through a part (part) 15 ′ of the cooling water circulation pipe located in the heat exchanger 14. Then cool and repeat. Therefore, the apparatus to be cooled does not overheat during operation of the fire pump.
[0013]
Since the pressure resistance of the heat exchanger 14 can be higher than the pressure resistance of the fire pump 10 itself, the water supplied to the water inlet of the fire pump can be discharged from a fire hydrant or another fire pump car by increasing the pressure. Even if the pressure on the suction side of the fire pump increases with water, it is not necessary to provide a safety device or the like for draining the supplied water to a road surface outside the vehicle.
[0014]
Further, the safety device can be similarly omitted by selecting a water pump 18 having a pressure that does not exceed the pressure resistance of the equipment to be cooled such as a sub-radiator due to its characteristics.
[0015]
Further, it is preferable that the orifice 22 be provided in the discharge water circulation pipe 13 immediately before entering the heat exchanger 14, even if the discharge pressure of the firefighting pump rises, because the discharge water is not consumed more than necessary.
[0016]
When the operation of the fire pump 10 is stopped from the engine via the transmission 20 after the fire extinguishing activity ends, the water pump 18 also stops.
[0017]
The equipment to be cooled is not limited to the sub-radiator and the transmission, but may be other equipment, and the number thereof is not limited to two, and may be one, three, or more. In the illustrated embodiment, the devices to be cooled 19 and 20 are connected in parallel to the cooling water circulation pipe 15, but they may be connected in series.
[0018]
【The invention's effect】
In the present invention, the discharge water of the fire pump, which may have a high pressure on the suction side, is circulated and used as the refrigerant of the heat exchanger, and the equipment to be cooled is cooled through the heat exchanger. Since it is water, there is no drainage on the road outside the vehicle. Therefore, firefighting activities are not hindered by water discharged outside the vehicle.
[Brief description of the drawings]
FIG. 1 is a flow sheet according to an embodiment of the present invention.
[Explanation of symbols]
Reference Signs List 10 Fire pump 11 Fire pump suction port 12 Fire pump discharge port 13 Discharge water circulation pipe 14 Heat exchanger 15 Cooling water circulation pipe 19, 20 Equipment to be cooled

Claims (2)

When the fire pump operates, a discharge water circulation pipe that circulates part of the discharge water of the fire pump to the water suction port of the fire pump, a heat exchanger that uses water flowing through the discharge water circulation pipe as a refrigerant, and water pumped by the water pump. A cooling water circulation pipe for cooling a device to be cooled, wherein a part of the cooling water circulation pipe is penetrated into the heat exchanger when the pump is operated in a fire pump truck. 2. The cooling device for a pump in a fire-fighting pump truck according to claim 1, wherein the pressure resistance of the heat exchanger is equal to or higher than the pressure resistance of the fire-fighting pump, and the water pump is selected such that the pressure does not increase more than the pressure resistance of the equipment to be cooled. A cooling device for operating a pump in a fire pump truck.

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