JPS6112089B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device using a heat pipe in an engine with an enclosure that reduces noise generation level by providing an enclosure.

In a normal engine, coolant is passed through the high-temperature parts of the engine to absorb heat, then the coolant that has absorbed this heat is passed through a radiator to exchange heat with the air to cool it, and then circulated back to the high-temperature parts of the engine. I'm letting you do it.

In order to block the noise radiated from the engine, the engine or engine room is covered with an enclosure, so-called engine enclosure or engine room enclosure, which reduces the heat dissipation effect from the engine and radiator. It is necessary to increase the capacity of the fan and cooling water pump. For this reason, in an engine with an enclosure, the noise generated by the cooling fan and cooling water pump is even louder than in an engine without an enclosure, which hinders the reduction in noise level, which is the original aim of the enclosure. was.

On the other hand, a method using a heat pipe to directly remove heat generated from the combustion chamber of the engine is also known.
(For example, Utility Model Publication No. 70336, 1973,
(Refer to Publication No. 96141) However, in the above-mentioned known method, the cylinder and cylinder head are directly cooled by the heat receiving part of the heat pipe. It also had the disadvantage that it also required cooling.

On the other hand, there is a method in which cylinder cooling water is cooled by a refrigeration cycle (see Japanese Utility Model Application No. 19827), and a method in which a sub-cooling water circuit is provided outside the engine closure in an engine with an engine closure (see Utility Model Application Publication No. 19827). (Refer to Publication No. 144129/1984) is also known, but both have mechanically driven parts such as rotational movement or reciprocating movement in the refrigerator and subcooler, so
This increases the number of noise sources and requires energy consumption, leading to deterioration of fuel efficiency.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an engine cooling device with an enclosure that improves the cooling effect of the engine without increasing the noise level.

This will be explained below with reference to figures.

FIG. 1 is a diagram explaining the principle of a heat pipe.

A pipe 1 made of a material with good thermal conductivity such as copper is provided with a wick 2 made of a porous material on its inner surface. A working fluid is sealed inside the pipe 1, and is evaporated in the heat receiving section of the pipe 1 and condensed in the heat radiating section 4. Uitsuku 2 is not necessarily necessary.

To explain its action, when the heat receiving part 3 is heated as shown in T ₁ , the working fluid evaporates, and the evaporated gas moves to the heat radiating part 4 as shown in T ₂ . Since the heat radiating section 4 radiates heat as indicated by T ₃ , the evaporated gas is condensed and adsorbed on the wick 2 , and the adsorbed working fluid is returned to the heat receiving section 3 by capillary action or other effects of gravity.

Heat exchange is performed by repeatedly performing the above-mentioned actions.

Next, an embodiment of the present invention in which the principle of the heat pipe described above is applied to cooling an internal combustion engine will be described with reference to FIG.

The engine 11 is provided with a cooling water pump 12 that circulates cooling water between the radiator 13 and a high temperature portion of the engine 11 that is to be cooled. The cooling fan 14 provides cooling air to the radiator 13. A thermostat (not shown) is provided in the cooling water circulation path to stop the circulation until the temperature of the cooling water reaches a predetermined value.

In order to insulate noise generated from the engine 11, radiator 13, and cooling fan 14, an enclosure 15 is provided and covers the entire engine 11, radiator 13, and cooling fan 14.

The heat pipe 16 has a heat receiving part 17 connected to the upper tank 1 of the radiator 13 of the engine cooling water circuit.
8, and a heat dissipation section 19 is provided at the upper part of the roof of the vehicle body 20.

Next, the specific structure of the heat receiving section 17 will be explained.

Referring to FIG. 3, an upper tank 22 is provided at the upper part of the radiator 21, into which coolant that cools the engine and becomes high temperature is sent, and the outer wall of the upper tank 22 serves as a heat receiving part 23 of a heat pipe. It is configured. heat exchange tube 2
4 is inserted into the tube plate 25 and the upper tank 22
The upper tank 22 is opened in the heat receiving part 2.
3. It is divided by a tube plate 25 and a heat exchange tube 24. Here, since the area of the heat receiving part 23 assists cooling by the radiator 21,
It is not necessarily necessary to cover the entire outer wall of the upper tank 22.

FIGS. 4 and 5 are diagrams showing further detailed embodiments of the heat dissipation section.

Referring to FIG. 4, an air deflector-shaped heat dissipation section 30 is provided at the upper part of the roof 29 of the vehicle body 20. As shown in FIG. Referring also to FIG. 5, the front surface 31 of the heat dissipating section 30 is curved in the lateral direction.

By configuring the heat dissipation section 30 of the heat pipe as described above, it is possible to prevent loss due to resistance and increase the heat dissipation area.

Since the apparatus according to the embodiment of the present invention is configured as described above, it produces the following effects.

Since heat pipes do not have mechanically moving parts such as rotational or reciprocating motion, they do not generate noise, and noise increases due to the increased capacity of cooling fans and cooling water pumps that occur when heat pipes are not used. can be suppressed. That is, in an engine that adopts an enclosure system, installing a sound insulating cover inevitably increases the capacity of the cooling fan and cooling water pump, which further increases the noise level, but according to the present invention, Since the increase in required heat due to the installation of an enclosure can be compensated for without generating noise, the enclosure method can be easily adopted.

Furthermore, since the heat radiating portion 19 is provided at the upper part of the vehicle body, it is easily exposed to wind as the vehicle moves, and the heat radiating effect is improved.

Since heat can be received in the upper tank where the cooling water temperature is relatively high, the cooling effect is not only good, but also because the outer wall of the upper tank is used as the heat receiving part, the heat receiving area can be widened.

Furthermore, by making the outer wall of the upper tank of the radiator also serve as the heat receiving part of the heat pipe, it is possible to achieve a reduction in size and weight, and also to reduce costs.

Furthermore, since the heat pipe is used to remove heat from the cooling water, compared to a system that directly cools the cylinder and cylinder head with a heat pipe, the cylinder and cylinder head can be actively cooled during cold starts and warm-up operations. There is no cooling and there is no risk of hindering cold start or warm-up operation.

As described above, according to the present invention, in an engine with an enclosure, the cooling effect can be improved without increasing the noise level.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the principle of a heat pipe. FIG. 2 is a schematic diagram showing one embodiment of the present invention, FIG. 3 is a sectional view showing a preferred embodiment of the heat receiving section of the present invention, and FIG. 4 is a perspective view showing a preferred embodiment of the heat radiating section. 5 is a sectional view taken along line XX in FIG. 4. 11...Engine, 12...Cooling water pump, 1
3...Radiator, 14...Cooling fan, 16
... heat pipe, 17 ... heat receiving section, 18 ... upper tank, 19 ... heat radiation section.

Claims (1)

[Claims] 1. In an engine with an enclosure that covers the engine room, including at least the radiator, and insulates noise radiated from various parts of the engine, the outer wall of the upper tank of the radiator through which cooling water passes after cooling the high-temperature parts of the engine. 1. A cooling device for an engine with an enclosure, characterized in that a part or all of the heat receiving part of the heat pipe is formed, and a heat radiating part of the heat pipe is provided in an upper part of a vehicle body.