JPH01121508A - Internal combustion engine cooling device - Google Patents

Abstract

PURPOSE:To enhance the cooling efficiency by furnishing an upper water passage around the combustion chamber and a lower water passage around the cylinder and circulating the cooling water in such a sequence as a radiator, the upper water passage, and a heat exchanger for condensation of the vapor from the cooling water between the two passages. CONSTITUTION:An upper water passage 21 is provided around the combustion chamber 20 of a cylinder head 23, while a lower water passage 22 around the cylinder 25 of a cylinder block 24. Outlet nozzle 212 of the upper water passage 21 is in communication with the inlet nozzle 31 of heat exchanger 3, while the inlet nozzle 221 of the lower water passage 22 in communication with the outlet nozzle 32 of heat exchanger 3. Cooling water from radiator 18 is led to the upper water passage 21 via a pump 10 and to the lower water passage 22 via the heat exchanger 3, when the vapor from the cooling water on the upper water passage 21 will be condensed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention makes it possible to change the flow direction of cooling water from the top to the bottom of the internal combustion engine. The present invention relates to a cooling device for an internal combustion engine.

[Prior art]

A cooling system for an internal combustion engine consists of a lower water passage for cooling around the cylinders of the internal combustion engine, an upper water passage for cooling the area around the combustion chamber of the internal combustion engine, and cooling water that has passed through both of the above water passages. It consists of a radiator for and,
Cooling water is normally circulated and cooled by entering the lower water passage from the radiator, rising to the upper water passage, and then returning to the radiator.

By the way, in a gasoline engine, the temperature of the cooling water in the upper part of the internal combustion engine (around the combustion chamber) is low.

By increasing the temperature of the cooling water in the lower part of the internal combustion engine (around the cylinders), it is possible to improve the output and fuel efficiency of the internal combustion engine (SAE841294. Japanese Patent Application Laid-Open No. 14861-1988)
(see 0).

Therefore, in order to adopt this method, it has been proposed to separate the cooling system into two systems, an upper passageway and a lower passageway (Japanese Unexamined Patent Application Publication No. 1999-1993).

The cooling device according to this proposal is shown in FIG.

Radiator 1, upper passageway 21 for cooling around the combustion chamber, and lower passageway 2 for cooling around the cylinder.
2, a control computer 7, and pumps 74 and 78 that send cooling water to the two passages in two systems. While the internal combustion engine 2 is operating, the upper water passage 21. The temperature of the cooling water discharged from the lower water passage 22 is detected, and the computer 7 pumps the pump 74.7B according to the preset temperature.

Furthermore, the valves 75 and 79 are actuated to open and close. Thus, the temperature of the cooling water fed into the upper water passage 21 and the lower water passage 22 is thereby controlled. In addition,
In the figure, reference numeral 72 is a pipe for sending out the cooling water from the upper water passage 21 and a part of the cooling water from the lower water passage 22, and 77 is a pipe for sending out a part of the cooling water from the lower water passage 22. The pipe 73 is a bypass.

Furthermore, a method has also been proposed in which cooling water is simply introduced into the upper water passage and discharged from the lower water passage.

[Problems to be solved]

However, the former mentioned above (JP 56-148610)
The structure is complicated, the heat dissipation capacity of the radiator needs to be increased, and the cost is high.

On the other hand, in the latter method of circulation from the upper passageway to the lower passageway, the temperature at the top of the internal combustion engine is extremely high, so the cooling water evaporates in the upper passageway, and the generated steam bubbles remain in the upper passageway. , which reduces heat transfer from the combustion chamber wall to the cooling water, leading to overheating of the internal combustion engine.

The present invention has been made in order to deal with such problems, and is an internal combustion engine cooling system that can direct the flow direction of cooling water from the upper part to the lower passage, and can actively cool the upper part of the internal combustion engine. The aim is to provide equipment.

[Means for solving problems]

The present invention provides an upper water passage for cooling the area around the combustion chamber of an internal combustion engine, a lower water passage for cooling the area around the cylinder of the internal combustion engine, and a water passage for cooling the cooling water that has passed through both of the water passages. a radiator, and a heat exchanger for condensing the vapor of cooling water evaporated in the upper passageway between the upper passageway and the lower passageway;
An internal combustion engine cooling device characterized in that the cooling water flows from the radiator through the upper water passage, the heat exchanger, and the lower water passage in order and flows back into the radiator.
This is called the first invention).

In the first aspect of the invention, the heat exchanger is a device for condensing steam in the cooling water introduced from the upper passageway. Therefore, the heat exchanger only needs to have a heat exchange capacity at least sufficient to condense vapor bubbles, and may be relatively small.

Cooling means in this heat exchanger include vehicle speed wind (driving wind), a blower similar to a fan used for cooling a radiator, and the like. Also.

Types of heat exchangers include radiators used in automobiles, pipe type, fin type 1, etc. Further, since the heat exchanger condenses the steam generated in the upper water passage, it is preferably provided above the upper water passage near the outlet of the upper water passage.

Further, as another cooling means for the heat exchanger, as shown in the second embodiment, a cooling water system separate from the cooling water for cooling the internal combustion engine may be provided to cool the heat exchanger. In this case, this separate cooling water system is provided with a side heat exchanger, and cooling water is circulated between the heat exchanger and the side heat exchanger. It is preferable that this side heat exchanger is disposed at a position where it can be cooled by wind at vehicle speed (see FIG. 2).

Further, as a second invention, a steam separator is provided in place of the heat exchanger in the first invention, and the steam separator separates steam bubbles in the cooling water, and the cooling water that does not contain 1M air is sent to the lower water passage. There is also a way to send it.

That is, the second invention has an upper water passage for cooling the area around the combustion chamber of the internal combustion engine, a lower water passage for cooling the area around the cylinder of the internal combustion engine, and a water passage for cooling the cooling water that has passed through the two-way waterway. radiator, and a steam separator is provided between the upper passageway and the lower passageway for separating the vapor of the cooling water evaporated in the upper passageway.

Cooling water flows from the radiator to the upper passageway, the steam separator,
An internal combustion engine cooling device characterized in that the internal combustion engine cooling device is configured to flow into the radiator again through a lower water passage in sequence.

In the second aspect of the invention, it is preferable that the steam separated once is sent to the reserve tank of the radiator through a steam exhaust pipe, or in the case of a stationary internal combustion engine, the steam separated once is discharged to the outside air. Also.

Since the steam in the cooling water can be easily separated due to the difference in specific gravity from the cooling water, the steam separator only needs to be a container with a constant volume. Other aspects are the same as those of the first invention.

[For production]

In the first invention, cooling water is sent out from the radiator and returns to the radiator through the upper water passage, the heat exchanger, and the lower water passage in sequence. However, in the above heat exchanger,
Steam generated in the upper water passage is condensed, and cooling water containing no steam is sent to the lower water passage.

In the second invention, the cooling water is sent out from the radiator and returns to the radiator through the upper water passage, the steam separator, and the lower water passage in sequence. Thus, the steam bubbles of the cooling water are separated in the steam separator, and the cooling water free of steam is fed into the lower water passage.

〔effect〕

According to the first invention, the upper water passage is supplied with cooling water at a lower temperature than the radiator, and the steam generated in the upper water passage is condensed by the heat exchanger, so that the cooling water that does not contain steam is transferred to the lower water passage. can be sent to. Therefore, in an internal combustion engine, the temperature of the cooling water around the upper combustion chamber is low, and the temperature of the cooling water around the lower cylinder is high. Therefore, the cooling efficiency in the lower passageway is also high, and efficient cooling can be performed.

Therefore, it is possible to improve the ignition timing by increasing the compression of the internal combustion engine. Furthermore, since the cylinder block can be maintained at a high temperature, friction loss in the cylinder can be reduced. Therefore, it is possible to provide an internal combustion engine with excellent output and fuel efficiency. Moreover, the equipment for achieving these is simple and inexpensive.

Moreover, according to the second invention, since a steam separator is provided in place of the heat exchanger of the first invention, steam bubbles can be efficiently discharged to the outside of the cooling water system. Other effects similar to those of the first invention can be obtained.

〔Example〕

First Embodiment A cooling device according to this embodiment will be explained with reference to FIGS. 1 and 2.

This device consists of a radiator 1 and an upper water passage 21 of an internal combustion engine 2.
, a lower water passage 22 , and a heat exchanger 3 . The radiator 1 has a cooling fan 15 and its upper cooling water conduit 11 is connected via a pump IO to an artificial nozzle 211 of an upper water passage 21 of the internal combustion engine. The cooling water conduit 14 below the radiator is also connected via a thermostat 17 to an outlet nozzle 222 of the lower water passage 22 of the internal combustion engine. Further, a bypass 16 is provided between the lower cooling water conduit 14 in front of the thermostat 17 and the upper cooling water conduit 11 in front of the pump 10.

In the internal combustion engine 2, the combustion chamber 2 of the cylinder head 23
0, the upper water passage 21, and the cylinder block 2.
A lower water passage 22 is provided around the cylinder 25 of No. 4. The outlet nozzle 212 of the upper water passage 21 communicates with the inlet nozzle 31 of the heat exchanger 3, and the inlet nozzle 221 of the lower water passage 22 communicates with the outlet nozzle 32 of the heat exchanger 3.

As shown in FIG. 2, the heat exchanger 3 includes a cooling pipe 33 and a number of fins 34 provided around the cooling pipe 33, and an inlet nozzle 31 below the cooling pipe 33. It has an outlet nozzle 32. It is an air-cooled heat exchanger. The heat exchanger 3 is disposed above the upper water passage 21.

In addition, at the top of the radiator l, there is a pressure cap 1.
A vibro 1 communicating with a reserve tank 6 is provided below the tank 8.

The device of this example is configured as described above.

Cooling water is pumped from the radiator l by a pump 10, and is passed through the upper water passage 21. Heat exchanger 3. It is circulated by a yarn path that passes through the lower water passage 22 and returns to the radiator 1 again.

Therefore, in the upper water passage 21, the cooling water flows into the combustion chamber 2.
It is heated by absorbing 0 combustion heat.

At this time, since the temperature of the combustion chamber 20 is high, a portion of the cooling water reaches a boiling state, and steam bubbles are generated. However, the steam bubbles are sent into the cooling pipe 33 of the heat exchanger 3 together with the high temperature cooling water by the subsequently introduced cooling water.

In heat exchanger 3.

Since heat is taken away from the fins 34 by the vehicle speed wind (driving wind) B, the cooling water and steam bubbles in the cooling pipe 33 are cooled, and 1 g of air condenses into water. Cooling water that does not contain steam bubbles is then sent to the lower water passage 22 from the outlet nozzle 32 of the heat exchanger 3. In the lower water passage 22, the radiator 1 is cooled to some extent in the heat exchanger 3.
Cooling water whose temperature is higher than the outlet temperature of the cylinder 25 is fed in, and the cooling water absorbs heat from the cylinder 25 and is further heated.

Further, the cooling water is returned to the radiator 1 through the thermostat 17, and is cooled by the fan 15 at a vehicle wind speed A. Note that when the temperature of the cooling water from the lower water passage 22 is low, the thermostat 17 is closed and the bypass 1 is closed.
6 through which cooling water is circulated.

According to this example, cooling water at a lower temperature than the radiator 1 can be supplied to the upper passageway 21 around the combustion chamber, and cooling water at a relatively higher temperature can be supplied to the lower passageway 22. Moreover, the steam bubbles generated in the upper water passage 21 can be condensed by the heat exchanger 3, and cooling water containing no steam can be supplied to the lower water passage, and the cooling efficiency in the lower water passage can also be increased.

Second Embodiment In this embodiment, as shown in FIG. 3, the heat exchanger 3 in the first embodiment is cooled by a heat exchanger 4 using a separate cooling channel.

That is, the heat exchanger 4 of this example includes a side heat exchanger 42 separate from the internal combustion engine cooling system, a water pump 44, and a heat exchanger 4.
A circulation pipe 43 for circulating cooling water between the heat exchanger 42 and the side heat exchanger 42 is provided. The heat exchange F! ! 4 vessel 4 is
A convection heat exchanger (not shown) consisting of a cooling pipe through which cooling water for an internal combustion engine passes, and a cylindrical cooling cylinder provided around the cooling pipe.
The inlet nozzle 401 of the cooling pipe communicates with the outlet nozzle 212 of the upper water passage 21, and the outlet nozzle 402 of the cooling pipe communicates with the inlet nozzle 221 of the lower water passage.

Thus, the cooling water sent from the side heat exchanger 42 is introduced into the cooling pipe of the heat exchanger 4 to cool the internal combustion engine cooling water in the cooling pipe of the heat exchanger 4.

The side heat exchanger 42 is arranged near the radiator 1 where a sufficient amount of vehicle speed wind or wind from the fan 15 can be obtained. The rest is the same as the first embodiment.

According to this example, the steam bubbles generated in the upper passageway 21 are cooled and condensed in the heat exchanger 4.

Further, the same effects as in the first embodiment can be obtained.

In addition, in this example, the heat exchanger 4 is a side heat exchanger 42.
Since the cooling water sent from the internal combustion engine is more actively cooled, the steam in the internal combustion engine cooling water can be efficiently condensed. Also.

This embodiment is effective when the air-cooled heat exchanger 3 as in the first embodiment cannot be sufficiently supplied with air at the vehicle speed.

Third Embodiment In this embodiment, as shown in FIGS. 4 and 5, a steam separator 5 is provided in place of the heat exchanger 3 of the first embodiment.

As shown in FIG. 5, the steam separator 5 has a steam discharge nozzle 54 at the top and a cooling water inlet nozzle 5 at the bottom on both sides.
2. An outlet nozzle 53 is provided. The inlet nozzle 52 is connected to the outlet nozzle 212 of the upper water passage 21 , and the outlet nozzle 53 is connected to the artificial nozzle 221 of the lower water passage 22 . Also.

The steam exhaust nozzle 54 is connected to a discharge vibe 55 that communicates with the reserve tank 6. The reserve tank 6 is of a closed type and communicates with the upper part of the radiator 1 through a vibro 3. The steam separator 5 is disposed above the upper water passage 21. The code 62 is.

It is a pressure cap.

Thus, in one embodiment, the cooling water is circulated in the same manner as in the first embodiment. Then, the cooling water containing steam bubbles sent out from the upper water passage 21 enters the steam separator 5, where the steam leaves upward, and is discharged from the steam exhaust nozzle 54 through the exhaust vibrator 55 into the reserve tank 6. Sent. and,
Much of the vapor is discharged from the exhaust pipe 55 and enters the reserve tank 6. The uncondensed steam enters the cooling water in the reserve tank 6 and is condensed.

According to this example, in addition to obtaining the same effects as those of the first example, the sealed reserve tank can be used effectively and the device is simple.

[Brief explanation of the drawing]

Figures 1 and 2 show the first embodiment, and Figure 1 is the entire cooling system! 2 is a plan sectional view of the heat exchanger, FIG. 3 is a conceptual diagram of the cooling device according to the second embodiment, FIGS. 4 and 5 show the third embodiment, and FIG. FIG. 5 is a front sectional view of a steam separator, and FIG. 6 is a conceptual diagram of a conventional cooling device. 1...Radiator, 10...Pump. 2... Internal combustion engine, 21... Upper water passage. 22...Lower water passage, 20...Combustion chamber. 25...Cylinder, 3,4...Heat exchanger. 42...Side heat exchanger, 5...Steam separator 1.54.
...Steam exhaust nozzle. 6... Reserve tank.

Claims (5)

[Claims] (1) An upper passage for cooling the area around the combustion chamber of the internal combustion engine, a lower passage for cooling the area around the cylinder of the internal combustion engine, and a radiator for cooling the cooling water that has passed through both passages. A heat exchanger is provided between the upper passageway and the lower passageway for condensing the vapor of the cooling water evaporated in the upper passageway, and the cooling water is transferred from the radiator to the upper passageway. What is claimed is: 1. An internal combustion engine cooling device characterized in that the internal combustion engine cooling device is configured to flow into the radiator again through a heat exchanger and a lower water passage in that order. (2) The internal combustion engine cooling device according to claim 1, wherein the heat exchanger is cooled by airflow from a vehicle speed, a blower, or the like. (3) The internal combustion engine cooling device according to claim 1, wherein the heat exchanger is cooled by cooling water different from cooling water for cooling the internal combustion engine. (4) An upper passage for cooling the area around the combustion chamber of the internal combustion engine, a lower passage for cooling the area around the cylinder of the internal combustion engine, and a radiator for cooling the cooling water that has passed through both passages. In addition, a steam separator is provided between the upper water passage and the lower water passage for separating the vapor of the cooling water evaporated in the upper water passage, and the cooling water is transferred from the radiator to the upper water passage. An internal combustion engine cooling device characterized in that the steam passes through a steam separator and a lower water passage in order and then flows back into a radiator. (5) The internal combustion engine cooling device according to claim 4, wherein the steam separator has a steam exhaust pipe for sending the separated steam to a reserve tank of a radiator or the like.