JPS5834259Y2 - Internal combustion engine intake air cooling system - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intake air cooling device for an internal combustion engine equipped with a fresh water indirect cooler using seawater.

Conventionally, the engine rooms of fishing boats (for example, less than 5 ton class) equipped with internal combustion engines equipped with fresh water indirect coolers using seawater cannot have a large space due to fishing space, etc., and ventilation in the engine room is insufficient. Therefore, the engine room temperature often reaches 60 degrees Celsius or higher in midsummer.

Therefore, an internal combustion engine that takes in air at such a high temperature will have its volumetric efficiency significantly reduced, and the combustion performance of the internal combustion engine will particularly deteriorate, resulting in incomplete combustion and the generation of black smoke. This had the disadvantage of increasing fuel consumption.

The purpose of the present invention is to provide an intake air cooling device for an internal combustion engine that eliminates the above-mentioned drawbacks of the conventional technology. A cooling seawater pipe 14 leading to a seawater intake port and a cooling seawater pipe 14' leading to a seawater outlet are provided in the container 1 (hereinafter referred to as the fresh water cooler main body), separated by a seawater passage partition plate 19, and A seawater passage head plate 11 partitioned by the seawater passage partition plate 19 is provided on the side surface of the fresh water cooler main body 1, and the seawater passage head plate 11 has a cooling seawater pipe 1.
An intake manifold 10 is provided in the seawater reversing passage connecting the fourth side part and the cooling seawater pipe 14' side part at a position opposite to the fresh water cooler main body 1 through the seawater passage end plate 11, and the intake manifold 10 Inside the manifold 10, a heat exchanger tube 9 with fins for cooling the intake air is provided in a spiral shape in its length direction, and a portion of the end plate 11 for the seawater passage on the side of the cooling seawater tube 14 and the side of the cooling seawater tube 14' is provided. This is an intake air cooling device for an internal combustion engine, in which the inlet button and outlet of the finned heat transfer tube 9 located in the section are connected to the seawater reversal passage.

An embodiment of the present invention will be described in detail below based on the drawings.

FIG. 1 is a partially sectional front view of the intake air cooling device of the present invention installed in an internal combustion engine, and FIGS. 2 and 3 are diagrams showing the state of connection between the fin heat tube 9 and the seawater reversal passage. .

As shown in FIG. 1, the intake air cooling device of the present invention has the central part of the fresh water cooler main body 1 located on the cylinder block 3 of the internal combustion engine located on the crankshaft center line 2 of the internal combustion engine, and the A seawater pump 4 is arranged on the left side of the cylinder block 3, and a fresh water pump 5 is arranged on the right side of the cylinder block 3.

To the left of the seawater pump 4 is a lubricating oil filter 6.

The fresh water cooler main body 1 has a thermostat 7 at the top of its left side, and a mirror plate 8 with a seawater intake and a seawater outlet at the bottom.On the opposite side, that is, on the right side in the figure, there is a thermostat 7 for cooling the intake air. Intake manifold 1 with fin heat tubes 9
There is a seawater passage end plate 11 connected to the opening of 0.

Conventionally, this seawater passage mirror plate 11 has a U-shape,
The seawater flowing through the cooling seawater pipe 14 was reversed and flowed into the cooling seawater pipe 14', but in the present invention, this U
The seawater reversing passage is partitioned and separated in the middle by a seawater passage partition plate 19, and the lower part thereof is provided with a fin-shaped heat tube 9 for cooling the intake air.
0 inlet and the upper part is connected to its outlet.

Although only one fin heat tube may be used, in this embodiment, in order to increase cooling efficiency, two fin heat tubes are used, and the diameters of the tubes are changed and they are arranged in a concentric spiral inside the intake manifold 10.

The state of connection between the fin heat tube 9 and the seawater passage end plate 11 is as shown in FIGS. 2 and 3.
The inlet 20 of the fin heat tube 9 is connected to the cooling seawater pipe 14 side portion of the seawater passage end plate 11 that is partitioned by The outlet 20' of is connected.

In addition, 21 is a corrosion-resistant zinc bolt, 22 is a packing, 23
is a union, 24 is a cap nut, and 25 is a joint.

In the fresh water tank in the center of the fresh water cooler main body 1, as shown in FIG. 1, a large number of buckle plates 12 are installed parallel to the end plate, so that fresh water circulates as shown by the dotted arrow.

Therefore, fresh water is supplied from the fresh water supply port 13, guided in two directions on the left and right top of the fresh water cooler main body 1, guided to the baffle plate 12, and twisted inside the fresh water tank as shown by the dotted arrow. The fresh water passes through between the cooling seawater pipes 14 and 14', and is collected at the outlet 15 on the lower surface of the fresh water cooler main body 1 while being cooled by the cooling seawater pipes 14 and 14'.

From there, the fresh water is guided to the fresh water pump 5 through a pipe 16, and then passed through the cylinder block 3 by the fresh water pump and returned to the fresh water supply port 13 of the fresh water cooler main body 1.

On the other hand, seawater is flowing from the pipe 17 leading to the sea outside the ship, indicated by the arrow A.
The seawater is sucked up by the seawater pump 4 as shown in FIG.

From there, the seawater passes through the cooling seawater pipe 14, cools the fresh water in the fresh water tank, and collects at the bottom of the seawater passage mirror plate 11 partitioned by the seawater passage partition plate 19.

From there, the seawater enters the fin heat tube 9 provided in the opening of the intake manifold 100, flows in a spiral pattern, cools the air taken into the intake manifold 10, and is separated by a seawater passage partition plate 19. into the upper part of the mirror plate 11 for the seawater passage.

From there, the seawater is further transferred to the cooling seawater pipe 14 in the fresh water tank.
'The fresh water is further cooled, guided into the end plate 8 leading to the seawater discharge port, and discharged into the sea outside the ship through a pipe.

Therefore, the combustion air entering the engine is transferred to the intake manifold 10
When passing between the concentric spiral fin heat tubes 9 through the openings, the seawater is cooled by the seawater passing through the fin heat tubes 9 to an appropriate temperature and introduced into the cylinder.

As described above, in the intake air cooling device of the present invention, the cooling seawater pipe 14 leading to the seawater intake and the cooling seawater pipe 14' leading to the seawater outlet are separated in the fresh water indirect cooler 1 by the seawater passage partition plate 19. At the same time, a seawater passage head plate 11 partitioned by the seawater passage partition plate 19 is provided on the side surface of the fresh water indirect cooler 1, and the seawater passage head plate 11 is provided with a cooling seawater pipe 1.
An intake manifold 10 is provided in the seawater reversing passage connecting the fourth side part and the cooling seawater pipe 14' side part at a position opposite to the fresh water indirect cooler 1 via the seawater passage end plate 11, and Inside the manifold 10, a heat tube 9 with fins for cooling the intake air is provided in a spiral shape in its length direction, and a portion of the end plate 11 for the seawater passage on the side of the cooling seawater tube 14 and the side of the cooling seawater tube 14' is provided. Since the inlet and outlet of the fin heat tube 90 located in the section are connected to the seawater reversal passage, the intake air to the internal combustion engine can be cooled by seawater without taking up a particularly large space in the narrow engine room. The volumetric efficiency of the internal combustion engine can be increased, and as a result, the combustion performance of the internal combustion engine can be improved and the generation of black smoke can be prevented, so that fuel consumption can be reduced.

In addition, since the intake manifold 10 can be installed in a spiral fin heat tube 9 that communicates the cooling seawater inside, there is no need to change the position or shape of the intake manifold 10. It is only necessary to attach the fin substitute heat tube 9 to an internal combustion engine equipped with the fin heat exchanger tube 9 to form the intake air cooling device of the present invention, and there is no need to go to the trouble of installing a separate cooling device. Since the intake manifold only needs to be made slightly larger, the desired purpose can be achieved without taking up too much engine space.

Therefore, according to the present invention, the intake air cooling device using seawater can be made compact, without impairing heat exchange performance, and by simply improving the existing device, cooling of fresh water with seawater and cooling of introduced air can be achieved. There are effects such as being able to achieve the following at the same time.

[Brief explanation of drawings]

FIG. 1 is a partial front view of the intake air cooling system of the present invention installed in an internal combustion engine, and FIGS. 2 and 3 are diagrams showing the state of connection between the fin substitute heat pipe and the seawater reversal passage. 1... Fresh water cooler body, 2... Crankshaft center line,
3... Cylinder block, 4... Seawater pump, 5.
... Fresh water pump, 8... End plate, 9... Fin heat tube, 10... Intake manifold, 11... End plate for seawater passage, 12... Baffle play), 14, 14'...
・Cooling seawater pipe, 19...Seawater passage partition plate.

Claims (1)

[Scope of utility model registration request] In an internal combustion engine equipped with a fresh water indirect cooler 1 using seawater, the fresh water indirect cooler 1 includes a cooling seawater pipe 14 leading to a seawater intake and a cooling seawater pipe 14' leading to a seawater outlet.
are provided separately by a seawater passage partition plate 19, and a seawater passage head plate 11 partitioned by the seawater passage partition plate 19 is provided on the side of the fresh water indirect cooler 1, and the seawater passage head plate 11 is cooled. The seawater reversing passage connecting the seawater pipe 14 side part and the cooling seawater pipe 14' side part is provided with a seawater passage mirror plate 11.
An intake manifold 10 is provided at a position opposite to the fresh water indirect cooler 1 via the intake manifold 10, and a finned heat transfer tube 9 for cooling the intake air is provided spirally in the length direction inside the intake manifold 10. At the same time, the internal combustion engine is constructed by connecting the inlet and outlet of the finned heat transfer tube 9 located on the cooling seawater pipe 14 side part button and the cooling seawater pipe 14' side part of the seawater passage end plate 11 to the seawater reversing passage. Engine intake air cooling system.