JPS5879615A - Cooling device of engine - Google Patents

Abstract

PURPOSE:To save energy, by cooling plural engines through a specific heat exchanger, that is, by cooling the pure water heat exchanger of the marine engines with seawater, controlling the driving of an electric motor driven centrifugal pump through temperature of pure water, sucking the seawater from a bottom location and discharging the seawater to an upper location through the electric motor driven centrifugal pump. CONSTITUTION:A pure water circulating circuit, comprising pure water circulating pumps 4, 5, temperature regulating valves 9, 10, feed water manifold 15, pure water heat exchanger 3 and suction water manifold 14, is connected to a ship propelling engine 1 and generator engine 2 at anchor. The pure water heat exchanger 3 is operated in such a manner that cooling seawater is sucked from a water intake port 11, provided in the bottom location of a ship, and discharged, after cooling, to a discharge port 12, located near the waterline, through an electric motor driven centrifugal pump 13 controlled with its driving by temperature switches 16, 17. At low temperature of pure water, even if the motor driven centrifugal pump is stopped, a temperature rise of engine cooling pure water causes the seawater to perform natural convection from the water intake port 11 to the discharge port 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling system when a specific seawater/fresh water heat exchanger or the like is used to cool a plurality of indirectly cooled engines installed in a ship or the like.

Conventionally, as shown in the example of FIG.
When the berthing generator engine 8 is an indirectly cooled engine, it is widely practiced to use one heat exchanger 8 for cooling.

That is, fresh water circulation pump 4, s, temperature adjustment valve 6, heat exchanger I
A fresh water circulation circuit is provided with an I3 or exit pipe 7, and a seawater pump 8 cools the heat exchange II3.
The following disadvantages were unavoidable: First, the seawater pump 8 always operates at full power regardless of the increase or decrease in engine load, so there is a loss of energy.

Secondly, since the temperature control valve is a device that matches the maximum output of the engine, when the engine load is light, its calorific value is small, so the fresh water circulation circuit frequently connects the heat exchange @ 3 and the exit pipe 7. Since it changes to tIII, it is easily damaged.

Thirdly, since the propulsion engine 1 and the berthing generator engine 2 share the temperature control valve S, there is the inconvenience that the set temperature of each engine must be the same. Even so, the generator engine 2 for berthing relatively small fish is always forced to operate under supercooling, resulting in a shortened lifespan.

The purpose of the present invention is to obtain an engine cooling system which does not have the above disadvantages t** when a plurality of tube-cooled engines are cooled by a specific heat exchanger, and an embodiment for a ship will be described below. The example is as follows.

Figure 2 is an explanatory system diagram when the present invention is implemented on a ship.
When equipped with scissors, each tank is equipped with a fresh water circulation pump 4.5 and temperature control valves 9 and 10, a water intake port 11 is provided on the bottom of the ship, and a water intake port is installed below the water line on the side shell plating. A heat exchanger 3 and an electric centrifugal seawater pump 13 are installed along the water level difference between the drain ports 11 and the drain port 11.
A fresh water circulation circuit is formed by introducing the seawater from outside the ship, and guiding the cooling fresh water of each engine to the fresh water side of the heat exchanger 3 through the water intake collecting pipe 14 and the water supply collecting pipe 164c, and then forming a fresh water circulation circuit. Temperature switches 16 and 17 are provided between the pipe 15 and each engine and are connected to the power supply circuit of the electric centrifugal seawater pump 13 by detecting the temperature of the cooling water and opening and closing the temperature switches 16 and 17. T
is the fresh water expansion tank, B is the bypass pipe, H is the hull, W
L is the water line.

The tank cooling device according to the present invention has the following effects by having the above arrangement.

That is, when a ship is on a normal voyage, the propulsion engine 1 works, so the temperature of the cooling fresh water rises and the degree switch 16 closes.

The electric centrifugal capo puffer 13 operates to cool the heat exchanger 3 and maintain the engine cooling water at an appropriate temperature.

Although the propulsion engine l is in operation when the ship is sailing at a slow speed or is stationary, its calorific value decreases to a minimum of vl.

Therefore, the temperature of the cooled fresh water flowing through the water suction collecting pipe 14 gradually decreases, and when the temperature drops to a preset temperature, the temperature switch 16 is opened and the electric centrifugal pump is stopped. At this time, although the seawater flowing through the heat exchanger 3 is stagnant, the fresh water circulation pump 4 is still operating, so the engine cooling fresh water circulates inside the heat exchanger 3 and warms the seawater. As a result, the density of seawater decreases as the temperature increases,
The seawater floats gently through the gap between the water intake port 11 and the electric centrifugal seawater pump 13 and is discharged out of the ship from the drain port 12, allowing a slight cooling effect to continue. If this cooling effect balances or exceeds the calorific value of the propulsion engine 1, the electric centrifugal seawater pump 13 remains stopped. Further, when the temperature of the engine cooling water rises and reaches the set temperature, the electric centrifugal pump 13 is activated to forcibly perform a cooling action.

Berthing generator engine 2 used when the ship is berthed at night, etc.
teeth.

Since the calorific value is 411 small compared to the respective capacities of the propulsion tank 1 and the heat exchanger 3, operation of the electric centrifugal seawater pump 13 is hardly required during its operation.

Furthermore, if the fresh water circulation pump 4 is a centrifugal pump, a part of the engine cooling fresh water discharged from the berthing power generation engine 2 to the water supply collecting pipe 16 will circulate inside the propulsion engine 1, which has a large surface area. Valve adjustment 9K.

The water reaches the 14 sections of the water intake manifold pipe through the provided air vent hole and the gap of the fresh water circulation pump 4, and circulates, thereby providing the advantage of performing a heat dissipation action and warming up the propulsion engine 1 at the same time.

As described above, according to the engine cooling device according to the present invention,
It is possible to use a specific heat exchanger for multiple engines! I
At the same time, you can save energy, which is essential for operating seawater pumps, prevent damage to temperature control valves, and ensure smooth use of tanks.

[Brief explanation of the drawing]

FIG. 1 is an explanatory system diagram showing a conventional cooling device, and FIG. 2 is an explanatory system diagram when the cooling device according to the present invention is implemented on a ship. l・・・・・・1-road engine G・・・・・・
・Mooring generator engine 3・・・・・・Heat exchange I
I4・t・・・Fresh water circulation pump 6・・・・・・・ia
*Adjustment valve 7... (Route pipe 8.
・・・・・・・・・Seawater pump 9・10・・・
Temperature adjustment valve 11...Water inlet 12...
・Drain port 13... Electric centrifugal seawater pump 14...
...Water absorption collecting pipe...Magnetic water collecting pipe
16・17・1 degree switch T... Fresh water expansion tank B... Bypass pipe H.
・・・・・・Vessel body WL・・・・
・Yasuhiro Kotada, representative of Kure Dia Co., Ltd., patent applicant for the water line

Claims (1)

[Claims] In a cooling system that directs cooling water, etc. of multiple engines installed in a shipyard to a specific heat exchanger, and supplies water, etc. from outside the ship to the heat exchanger, the heat exchanger WjI#c supplies water from outside the ship. An inlet for water, etc. is provided at the bottom of the vessel, etc., and an outlet is provided at the upper part below the water surface, and water, etc. from the heat exchanger and outside the vessel is supplied along the difference in water level between the inlet and the outlet. A temperature switch that detects the temperature of the engine cooling water circulating through the heat exchanger and opens and closes it controls the start and stop of the electric centrifugal pump. It is characterized by the fact that as the temperature of the exchanger increases, water etc. from outside the ship naturally flows. Engine cooling system.