JP2515301Y2 - Engine cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a water-cooled engine having a water-cooled charge air cooler.

[Conventional technology]

An example of a cooling system diagram of a conventional general water-cooled engine (excluding a closed cooling system such as a radiator system) with a water-cooled charge air cooler is shown in FIGS. 2 and 3.

In FIG. 2, 4 is an engine body, 2 is a supply air cooler, 3 and 27 are cooling water pumps, 24 is a thermostat, 25 is a thermostat case, 26 is a cooling water bypass pipe, and 1
Reference numerals 1 and 28 are cooling water inlet pipes, and 10 and 29 are cooling water outlet pipes.

In the system shown in FIG. 2, the cooling water pump 3 has a cooling circuit for the engine body 4 and the cooling water pump 27 has a dedicated water circuit for cooling the supply air.

In the engine body side cooling water circuit, the cooling water taken in through the cooling water inlet pipe 28 passes through the cooling water pipe 3 to enter the engine body 4, and after cooling it, is guided to the thermostat case 25.

At this time, if the cooling water temperature is lower than the valve opening temperature setting of the thermostat 24 (when the thermostat 24 is closed)
Is the cooling water pump 3 via the cooling water bypass pipe 26.
Then, it is guided to the engine body 4 again.

Further, when the temperature of the cooling water in the thermostat case 25 is higher than the valve opening set temperature of the thermostat 24 (when the thermostat 24 is open), it is discharged to the outside through the cooling water outlet pipe 29.

At this time, the amount of water discharged to the outside is the cooling water inlet pipe 28.
A new cooling water system is created.

In addition, the cooling water on the cooling water pump 27 side is always the air supply cooler 2.
It passes through the inside and cools the high-temperature charge air compressed by a turbocharger or the like.

In FIG. 3, 4 is an engine body, 2 is a charge air cooler, 3 and 22 are cooling water pumps, 18 and 20 are thermostat cases, 19 and 21 are thermostats, 23 and 31 are cooling water bypass pipes, and 33 is cooling. A water inlet pipe and 32 are cooling water outlet pipes.

In this system, a thermostat 21 is added to the one shown in FIG. 2 to cool the engine body 4 and the high temperature supply air by a single cooling circuit.

When the temperature of the cooling water that has cooled the engine body 4 is higher than the set value, the thermostat 19 opens, and the cooling water is discharged to the outside through the cooling water outlet pipe 32. When the temperature is lower than the set value, the thermostat 19 opens. The valve is closed and the cooling water is introduced into the engine body 4 again via the cooling water bypass pipe 23.

The thermostat 21 is set so as to close when the thermostat 19 is in the valve open state and open when the thermostat 19 is in the valve closed state. The thermostat 21 constantly supplies cooling water to the intake air cooler 2 and the engine body 4 When the cooling water that has cooled the cooling water is discharged to the outside, the cooling water is taken into the engine body 4 side by that amount.

[Problems to be solved by the device]

However, the above conventional technique has the following problems.

(1) In the case of FIG. 2, since the cooling water circuit has two systems,
The arrangement of the external pipe (the pipe on the side of the air supply / cooler 2) becomes complicated.

(2) In the case of FIG. 3, the cooling water circuit is one system, and although the complexity of the layout of the external piping is eliminated, the circuit configuration is more complicated than that of FIG. 2, and the operation of the two thermostats is synchronized. The work to do is complicated.

(3) Both FIGS. 2 and 3 require two cooling water pumps, which results in high cost.

The present invention solves the above problems, and an object of the present invention is to provide a single-system cooling water circuit having a simple circuit configuration and the like.

[Means for solving the problem]

The present invention provides a cooling water intake pipe for supplying cooling water to a charge air cooler, and a cooling water pump that passes cooling water that has passed through the charge air cooler via a cooling water pump.
Cooling water pipe that supplies the cooling water inlet to the second cooling water inlet of the thermostat case, and the cooling water pipe that supplies the cooling water that has passed through the engine body to the second cooling water inlet of the thermostat case.
Cooling water outlet pipe that communicates with the cooling water outlet of the thermostat case and a bypass pipe that communicates the first cooling water outlet of the thermostat case with the cooling water intake pipe, and opens in the thermostat case. Two thermostats having the same valve temperature are provided, and when the thermostat is closed, the first cooling water inlet and the second cooling water outlet communicate with the second cooling water inlet and the first cooling water outlet, A cooling device for an engine, characterized in that the second cooling water inlet and the second cooling water outlet are configured to communicate with each other when the thermostat is opened.

[Action]

According to the present invention having the above configuration, when the thermostat is closed, the cooling water supplied to the engine body via the air supply cooler and the cooling pump is returned to the cooling water intake pipe by the bypass pipe.

Further, the cooling water supplied from the cooling pump to the thermostat case is discharged to the outside, and the same amount of new cooling water as the discharged amount is taken in.

When the thermostat is opened, all the cooling water that has passed through the air supply cooler and the cooling pump is supplied to the engine body, and after cooling the engine body, all is discharged to the outside, and the same amount of new cooling water as the discharge amount is released. Can be incorporated.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 (a) and 1 (b).

In the figure, 1 is a cooling water intake pipe, 2 is a supply air cooler, 3 is a cooling water pump, 4 is an engine body, and 100 is a first
A thermostat in which the thermostat 6 and the second thermostat 7 are housed, 5 is a thermostat case, 8 is a bypass pipe, 9 and 9'is a cooling water pipe, and 10 is a cooling water outlet pipe.

The cooling water taken in from the cooling water intake pipe 1 is supplied to the engine body 4 and the first cooling water inlet D of the thermostat 5 by the cooling water pipe 9 via the air supply cooler 2 and the cooling water pump 3.

The cooling water supplied to the engine body 4 is supplied to the inlet chamber 51 through the second cooling water inlet A of the thermostat case 5 by the cooling water pipe 9 ′ after cooling the engine body.

The temperature of this cooling water is the first and second thermostats 6,
If the temperature is below the valve opening set temperature of 7 (almost the same), the inlet chamber
The cooling water supplied to 51 passes through the hole B of the first thermostat 6, is guided from the first cooling water outlet G of the thermostat case 5 through the bypass pipe 8 to the cooling water intake pipe 1, and is supplied again as cooling water. (Part of the cooling water is confined in the inside C of the second thermostat 7).

On the other hand, the cooling water supplied to the first cooling water inlet D of the thermostat case 5 is discharged to the outside from the second cooling water outlet H through the inside E of the thermostat 100, and the cooling water of the discharged water amount is cooled. It is newly taken in from the water intake pipe 1.

When the temperature of the cooling water supplied to the inlet chamber 51 is equal to or higher than the valve opening set temperature of the first and second thermostats 6 and 7, the second thermostat 7 contacts the thermostat 100 and the first cooling water inlet D is Since it is closed, all the cooling water that has passed through the cooling pump 3 is supplied to the engine body 4.

Further, since the first thermostat 6 contacts the thermostat 100 to close the hole B on the first cooling water outlet G side and form the passage F, the first thermostat 6 is supplied to the inlet chamber 51 of the thermostat 100 via the engine body 4. The discharged cooling water is all discharged to the outside from the second cooling water outlet H together with the cooling water trapped in the second thermostat C, and the cooling water corresponding to the discharged amount of water or the cooling water intake pipe 1 is newly taken in. .

Even when the opening and closing timings of the thermostats 6 and 7 are deviated and one of them is opened and the other is closed, the cooling water is released to the outside through the thermostat of the opened valve, and the amount of cooling water is released. Is newly introduced, there will be no shortage of cooling water in the system.

[Effect of device]

 From the above, the present invention has the following effects.

(1) It is possible to simplify one cooling water circuit that does not require external piping.

(2) Even if there is some deviation in the characteristics of the two thermostats (even if one is in the open state and the other is in the closed state), the cooling water is supplied to the charge air cooler and the engine body without delay. Therefore, complicated tuning work becomes unnecessary.

(3) Since only one cooling pump is required, the cost will be reduced.

[Brief description of drawings]

FIG. 1 (a) is a system diagram of a cooling device according to an embodiment of the present invention, FIG. 1 (b) is a state diagram when a thermostat is opened, and FIG. 2 is a system diagram of a conventional cooling device. FIG. 3 is another system diagram of a conventional cooling device. 1 …… Cooling water intake pipe 2 …… Supply cooler 3 …… Cooling water pump 4 …… Engine body 5 …… Thermostat case 6 …… First thermostat 7 …… Second thermostat 8 …… Bypass pipe 9, 9 ′ …… Cooling water pipe 10 …… Cooling water outlet pipe

Claims (1)

(57) [Scope of utility model registration request] 1. A cooling water intake pipe (1) for supplying cooling water to a supply air cooler (2), and cooling water passing through the supply air cooler (2) through a cooling pump (3) to an engine body. (4) and the cooling water pipe (9) that supplies the cooling water pipe (9) to the first cooling water inlet (D) of the thermostat case (5) and the cooling water that has passed through the engine body (4).
Water pipe (9 ') for supplying to the second cooling water inlet (A) of
A cooling water outlet pipe (10) communicating with the second cooling water outlet (H) of the thermostat case (5) and discharging the cooling water to the outside; and a first cooling water outlet (G) of the thermostat case (5). ) And a cooling water intake pipe (1) are connected to each other, and two thermostats (6, 7) having the same valve opening temperature are arranged in the thermostat case (5). When the valves 6 and 7) are closed, the first cooling water inlet (D) and the second cooling water outlet (H) are connected to each other, and the second cooling water inlet (A) and the first cooling water outlet (G) are connected to each other. The second cooling water inlet (A) and the second cooling water outlet (H) are communicated with each other and the thermostats (6, 7) are opened.
An engine cooling device, which is configured to communicate with each other.