JPS585052Y2 - Fresh water expansion tank in marine internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a fresh water expansion tank used in a fresh water cooling system for a marine internal combustion engine.

Marine internal combustion engines use fresh water as cooling water, circulate it, and use seawater to cool the high-temperature parts of the engine.

In order to cool this high-temperature fresh water (also called hot water) with seawater, a shell-and-tube heat exchanger is usually used, but when the hot water flowing into the heat exchanger is high temperature,
A large amount of air bubbles are mixed in the hot water, reducing the heat exchange efficiency. Therefore, before supplying hot water to the heat exchanger, this hot water is first flowed into an expansion tank to eliminate air bubbles in the hot water. Separation measures are being taken.

However, with conventional expansion tanks, hot water is simply introduced into the tank, and bubble separation is performed statically, so sufficient (complete) bubble separation cannot be expected. Ta.

The present invention is an attempt to eliminate such drawbacks of the conventional example.The present invention consists of: □An expansion tank is installed in parallel above the heat exchange core unit, and the outer wall of the heat exchange core unit is used as a partition wall. , the inner wall surface near the end of the expansion tank is a curved inclined surface, hot water supplied from a hot water passage provided opposite to the inclined surface is swirled along the inclined surface, and the partition wall is used for heat exchange. providing a plurality of openings communicating with the expansion tank while maintaining predetermined intervals in the longitudinal direction of the core unit;
The feature is that the hot water in the expansion tank is introduced into the replacement core unit through the plurality of openings, and the salt water that has flowed into the expansion tank by intercepting it in this way is stored inside the tank. Because of the swirling, the time for the hot water to flow within the tank becomes longer, and the hot water becomes turbulent within the tank, allowing for "dynamic" bubble separation.

Further, since there are a plurality of openings in the partition wall, the hot water flowing into the heat exchange core unit from the expansion tank is divided into two parts, which increases turbulence inside the tank.

As described above, when using the expansion tank of the present invention, the extension of the flowing time of fresh water in the tank and the dynamic bubble separation combine to make the separation of bubbles from fresh water into a complete layer. You will be able to do so.

Next, an embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 6 denotes a heat exchange core unit in the fresh water cooler, and an expansion tank 8 is attached above the core unit 6.

7 is a partition wall, which is also an outer wall of the core unit 6.

Openings 4 and 5 are provided at both left and right ends of the partition wall 7 to communicate the inside of the core unit 6 and the inside of the expansion tank 8, and the hot water flows from the expansion tank 8 as shown by the arrow. Then, it flows into the core unit 6 through the plurality of openings 4 and 5.

Inside the core unit 6, a plurality of deflection plates 9 for creating a zigzag flow path for the inflowing hot water and a conduit 10 for cooling water (mainly seawater) for cooling the hot water are provided.

After being cooled by the core unit 6, the hot water is taken out from the lower opening 11 of the core unit 6 and used as cooling water for the engine.

On the other hand, at the left end of the expansion tank 8, a hot water inflow device 1 having a thermostatic valve 1C for controlling the flow of hot fresh water into the expansion tank 8 is provided.

The hot water inflow device 1 includes an inflow pipe 1D connected to a hot water supply source (engine cooling device), and a temperature sensing section 1 installed inside the inflow pipe 1D.
It consists of a thermostatic valve 1C operated by E, a bypass passage 1B, and a passage through which the hot water flowing in when the thermostat valve 1C is opened flows out to the expansion tank 8. When the temperature of the hot water is above a predetermined value, the engine Cooling water flowing back from the cooling device is guided to the expansion tank 8.

The inner wall surface of the expansion tank 8 is connected to the passage 1 as shown in FIG.
A curved inclined surface 2.degree. 3 is formed to guide the hot water flowing out from the person into a swirling flow within the expansion tank 8.

Therefore, the hot water flowing in from one person in the aisle is transferred to the expansion tank 8.
The flow becomes a swirling flow as shown by the arrow in FIG. It is introduced into the heat exchange core unit 6 through a plurality of openings 4.5 provided in the heat exchange core unit 6.

Since the hot water flowing into the expansion tank 8 swirls within the tank in this manner, the time during which the hot water flows within the expansion tank 8 becomes longer.

This expansion tank is installed to separate air bubbles that can interfere with heat transfer from the hot water, so the longer the flow time of the hot water in the expansion tank, the greater the amount of water that can be removed from the hot water. bubbles will be separated.

Furthermore, since the hot water is introduced from the expansion tank 8 into the heat exchange core unit 6 through the plurality of openings 4 and 5 provided in the partition wall 7, the swirling flow of hot water in the expansion tank 8 has a kind of stirring effect. , thereby ``dynamic j (Dyn
amic) bubble separation takes place.

Then, in this expansion tank 8, the hot water with sufficient air bubble separation is sent into the core unit 6, where it is cooled by seawater. For example, since the bubbles in the hot water are sufficiently separated from the hot water as described above, the hot water is completely cooled by the seawater in the core unit 6.
You can use engine cooling water at a lower temperature.

The inner wall surface of the expansion tank 8 provided above the heat exchange core unit 6 is formed into curved inclined surfaces 2 and 3, and the hot water supplied from the hot water passage provided opposite to the inclined surface is directed along the inclined surface. Since the hot water in the expansion tank 8 is introduced into the heat exchange core unit 6 through a plurality of openings 4 and 5 provided in the partition wall 7 of the core unit 6, the temperature inside the expansion tank 8 is The swirling flow of hot water becomes powerful,
A very remarkable bubble separation effect can be expected, and especially when the device of the present invention is applied to a marine engine, great effects can be obtained, and its practicality is extremely great.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, with FIG. 1 being a partially sectional side view and FIG. 2 being a partially sectional front view. 1... Hot water inflow device, 2, 3... Curved slope, 4, 5... Opening, 6...
Core unit, 7... partition, 8... expansion tank, 9... drift plate, 10... cooling water pipe.

Claims (1)

[Scope of utility model registration request] A Marabari tank having an outer wall of the heat exchange core unit as a partition wall is arranged in parallel above the heat exchange core unit, and the inner wall surface near the end of the expansion tank is a curved slope,
Hot water supplied from a hot water passage provided opposite to the inclined surface is swirled along the inclined surface, and the heat exchange core unit is connected to the expansion tank by maintaining a predetermined interval in the longitudinal direction of the heat exchange core unit at the partition wall. A fresh water expansion tank for a marine internal combustion engine, which is provided with a plurality of openings that communicate with each other, and hot water in the expansion tank is introduced into a replacement core unit through the plurality of openings.