JPH08200973A - Two-system cooling heat exchanger and two-system cooler using the heat exchanger - Google Patents

Abstract

PURPOSE: To improve the efficiency of two-system cooling by coupling heat pipes in which operating fluids having different boiling temperatures are sealed in series, forming heat exchange chambers having different cooling systems at the outside, and providing radiating members. CONSTITUTION: A first heat pipe 2 in which first operating fluid is sealed is coupled to a second heat pipe 2 in which second operating fluid having lower boiling temperature than that of the first fluid is sealed by a coupler 4. If the temperature of first cooling liquid is higher than the operating temperature of the first fluid, the first fluid sealed in the first pipe 2 derives the heat of the first liquid in a first heat exchange chamber 5 to be boiled to reach a second heat exchanger chamber 6, is cooled by the second liquid to be liquefied, and returned to the chamber 5. If the temperature of second cooling liquid is higher than the operating temperature of the second fluid, the second fluid sealed in the second pipe 2 is boiled in the chamber 6 to reach the part 3 mounted with a radiating member 15 at the outer surface, air-cooled to be liquefied, and returned to the chamber 6.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a two-system cooling heat exchanger,
And a two-system cooling device for an engine using a two-system cooling heat exchanger.

[0002]

2. Description of the Related Art In an engine, particularly an automobile engine, the same cooling liquid controlled by one thermostat generally flows through a cylinder head portion and a cylinder block portion of the engine. However, it is desirable to cool the cylinder head part of the engine at a low temperature in order to prevent knocking or improve the charging efficiency, and conversely, the cylinder block part is relatively heated to reduce friction or HC (hydrocarbon). It is desirable to cool with.

From such a point of view, a two-system cooling device for cooling the cylinder head portion and the cylinder block portion at different temperatures has been proposed.
Is disclosed in Japanese Patent Application Laid-Open Publication No. HEI 9-203 (1995). However, the device disclosed in the publication requires two radiators, two thermostats, and two water pumps. On the other hand, a liquid chamber having a liquid inlet and a liquid outlet, a straight tubular heat pipe extending from the inside of the liquid chamber to the outside, and a spiral shape that communicates with the straight tubular heat pipe and spirally surrounds the outer circumference of the straight tubular heat pipe. A compact heat exchanger composed of a heat pipe is disclosed in Japanese Patent Laid-Open No. 6-159888.

[0004]

[Patent Document 1] Japanese Patent Laid-Open No. 6-1
It is conceivable that two heat exchangers disclosed in Japanese Patent No. 59888 are arranged in parallel to form a two-system cooling device as disclosed in Japanese Utility Model Publication No. 50-10940. However, in this case, in the heat exchanger on the cylinder head side, the cooling efficiency is poor as compared with the heat exchanger on the cylinder block side because the difference between the temperature of the heat radiating portion and the temperature of the cooling medium such as air is small. There is. In view of the above problems, it is an object of the present invention to provide a two-system cooling heat exchanger with good cooling efficiency and a cooling device using the same.

[0005]

According to claim 1 of the present invention, a first heat pipe enclosing a first working fluid that boils when heated to a predetermined temperature or higher, and the first heat pipe. A second heat pipe having a second working fluid, which is connected at a longitudinal end portion and is boiled when heated to a temperature lower than a predetermined temperature lower than that of the first working fluid, and only the first heat pipe. A first heat exchange chamber disposed in the
A second heat exchange chamber arranged so as to continuously cover both the heat pipe and the second heat pipe with a connecting portion interposed therebetween;
A second heat exchange member configured to include a heat radiating member attached to an outer surface of the second heat pipe outside the second heat exchange chamber, allowing the first cooling liquid to be cooled to pass through the first heat exchange chamber; A two-system cooling heat exchanger is provided, which allows a second cooling liquid to be cooled to pass through the chamber.

According to the second aspect of the present invention, the first working fluid containing the first working fluid boiling when heated to a predetermined temperature or higher is enclosed.
A second heat pipe, which is connected to the first heat pipe at an end portion in the longitudinal axis direction and which contains a second working fluid that boils when heated to a temperature lower than a predetermined temperature lower than that of the first working fluid.
A heat pipe, a first heat exchange chamber arranged so as to cover only the first heat pipe, and both the first heat pipe and the second heat pipe so as to continuously cover them with a connecting portion interposed therebetween. The first heat of a two-system cooling heat exchanger including a second heat exchange chamber provided and a heat radiating member attached to the outer surface of the second heat pipe outside the second heat exchange chamber. A two-system cooling device for an engine is provided in which a cylinder block cooling liquid for cooling a cylinder block portion of an engine is passed through the exchange chamber and a cylinder head cooling liquid for cooling a cylinder head portion of the engine is passed through the second heat exchange chamber. Provided.

[0007]

According to the first aspect of the present invention, when the temperature of the first cooling liquid is higher than the operating temperature of the first working fluid, the first working fluid enclosed in the first heat pipe receives the first heat exchange. Inside the chamber, the heat of the first cooling liquid is taken away to boil and reach the inside of the second heat exchange chamber, where it is cooled by the second cooling liquid and liquefied to form the first cooling liquid.
Return to the inside of the heat exchange chamber. When the temperature of the second cooling fluid is higher than the operating temperature of the second working fluid, the second working fluid enclosed in the second heat pipe takes heat of the second cooling fluid inside the second heat exchange chamber. And boil to reach the portion where the heat dissipation member is attached to the outer surface, where it is cooled by air and liquefied to return to the inside of the second heat exchange chamber.

According to the second aspect of the present invention, the first cooling liquid removes heat in the cylinder block portion of the engine and is introduced into the first heat exchange chamber of the heat exchanger according to the first aspect. When the temperature is higher than the operating temperature of the first working fluid, the heat exchange as described above is performed in the first heat exchange chamber, the first cooling liquid is cooled, and the water is returned to the water passage in the cylinder block portion of the engine. Return. Further, the second cooling liquid takes heat from the cylinder head portion of the engine and is introduced into the second heat exchange chamber of the heat exchanger according to claim 1. If the temperature is higher than the working temperature of the second working fluid,
The above-mentioned heat exchange is performed in the second heat exchange chamber, the second cooling liquid is cooled, and returns to the water passage in the cylinder head portion of the engine again. When the temperature of the second cooling liquid is higher than that of the first cooling liquid, heat conduction causes
Heat is transferred to the first cooling liquid through the body of the first heat pipe, the first cooling liquid is warmed, and the warmed first cooling liquid is
Warm the cylinder block of the engine.

[0009]

FIG. 1 is a sectional view of an embodiment of a heat exchanger according to the present invention. In FIG. 1, reference numeral 1 denotes the entire two-system cooling heat exchanger, which is a tubular first heat pipe 2 in which a first working fluid S1 is enclosed, and a first heat pipe 2 having a boiling temperature lower than that of the first working fluid S1. 2 The same tubular second containing the working fluid S2
The heat pipes 2 are connected at the joints 4. Two
Reference characters a and 3a are so-called wicks, which are arranged inside the first heat pipe 2 and the second heat pipe 3 with a gap from the tube wall to perform a capillary action. For example, a wire mesh. Also, the first
A first heat exchange chamber 5 having an inlet 5i for taking in the cooling liquid R1 and an outlet 5o for discharging, and a second heat exchange chamber having an inlet 6i for taking in the second cooling liquid R2 to be cooled and an outlet 6o for discharging. 6 are connected at a connecting portion 7.

An electric motor 8 is attached to the end of the first cooling chamber 5 and has a rotation shaft (not shown) of the electric motor 8.
Is connected to the first heat pipe 2. The first heat pipe 2 and the second heat pipe 3 are seal members 9, 1
The first heat exchange chamber 5 and the second heat exchange chamber 6 via 0 and 11
It is rotatably supported by and is rotated integrally by the electric motor 8.

The spiral fin 12 is fixedly attached to the first heat pipe 2, and when the first heat pipe 2 is rotated by the electric motor 8, the first cooling liquid R1.
Is transferred from the inlet 5i to the outlet 5o of the first heat exchange chamber 5 and the heat of the first cooling liquid R1 is transferred to the first working fluid S1. The spiral fin 13 is fixedly attached to the first heat pipe 2, and when the first heat pipe 2 is rotated by the electric motor 8, the second cooling liquid R2 is supplied from the inlet 6i of the second heat exchange chamber 6 to the first heat. The pipe 2 and the second heat pipe 3 are transferred to the joint 4 and the first
The heat of the working fluid S1 is transferred to the second cooling liquid R2. The spiral fin 14 is fixedly attached to the second heat pipe 3, and when the second heat pipe 3 is rotated by the electric motor 8, the second cooling liquid R2 is coupled to the first heat pipe 2 and the second heat pipe 3. Part 4 to second
The second cooling liquid R is transferred to the outlet 6o of the heat exchange chamber 6
The heat of 2 is transferred to the second working fluid S2. The fins 15 are fixedly attached to the second heat pipe 3, and rotate when the second heat pipe 3 is rotated by the electric motor 8 to radiate the heat of the second working fluid S2 to the outside.

FIG. 2 shows operating characteristics with respect to the temperatures of the first working fluid S1 and the second working fluid S2. As shown in FIG. 2, the heat flow rate of each working fluid is at a certain temperature due to boiling of the working fluid. However, due to the evaporation characteristic of the working fluid and the heat conduction through the pipe, it is slightly present even at lower temperatures.

FIG. 3 shows an embodiment of a cooling device incorporating the heat exchanger constructed as described above, and shows a cooling device for an automobile engine. In FIG. 3, 100 is an engine, and the engine 100 is a head gasket 11
It is composed of a cylinder block 120 and a cylinder head 130 which are connected via 0.

Inside the cylinder block 120 and the cylinder head 130, independent cooling liquid passages are arranged (not shown), and the inlet 120i of the cooling liquid passage 120a of the cylinder block 120 is the first of the heat exchanger 1. The outlet 120o of the heat exchange chamber 5 is communicated with the outlet 120o of the first heat exchange chamber 5 of the heat exchanger 1, and the inlet 130i of the cooling liquid passage 130a of the cylinder head 130 is connected with the inlet 5Oi of the heat exchanger 1. 2 is in communication with the outlet 6o of the heat exchange chamber 6, and the outlet 1
30o communicates with the inlet 6i of the second heat exchange chamber 6 of the heat exchanger 1. Therefore, the first cooling liquid R1 that cools the cylinder block 120 and the second cooling liquid R2 that cools the cylinder head 130 do not mix with each other and circulate in independent cooling circuits.

Next, the operation of the above cooling device will be described. First, how the temperatures of the first cooling liquid R1 and the second cooling liquid R2 rise will be described. FIG. 4 shows the first cooling liquid R1 and the second cooling liquid R1.
As the temperature of the cooling liquid R2 rises and the amount of heat generated in the cylinder head portion is larger than that in the cylinder block portion, the second cooling liquid R2 for cooling the cylinder head portion rises faster and the cylinder block portion The first to cool
The cooling liquid R1 rises more slowly. However, in the steady state, the first cooling liquid R1 controlled by the first working fluid S1 on the higher operating temperature side is the second cooling liquid controlled by the second working fluid S2 on the lower operating temperature side. Higher than R2.

First, the steady state will be described. The first cooling liquid R1 in the lowest temperature state in the system immediately after the cooling, which is delivered from the outlet 5o of the first heat exchange chamber 5 of the heat exchanger 1 by the spiral fin 12 rotated by the motor 8, is From the inlet 120i into the water passage 120a inside the cylinder block 120 of the engine 100,
After removing heat from the cylinder block 120, the outlet 1
It is discharged from 20o and enters the first heat exchange chamber 5 of the heat exchanger 1 through the inlet 5i again.

In the steady state, the temperature of the first cooling liquid R1 entering the first heat exchange chamber 5 is higher than the boiling point of the first working fluid S1 enclosed in the first heat pipe 2, and the first cooling liquid R1 The heat of R1 is transferred to the first working fluid S1 via the spiral fin 11 and the first heat pipe 1. Then
The first working fluid S1 removes heat of evaporation from the first cooling liquid R1 and boils, becoming vapor and moving upward inside the first heat pipe 1. Then, the first cooling liquid R1 is deprived of heat and the temperature thereof drops, so that the first cooling liquid R1 exits from the outlet 5o again in a cooled state.

On the other hand, the spiral fins 13 and 14 rotated by the motor 8 immediately after the completion of cooling sent from the outlet 6o of the second heat exchange chamber 6 of the heat exchanger 1 have the lowest temperature in the system. The 2 coolant R2 is supplied from the inlet 130i to the engine 100 by the water pump 140.
Is sent to the water passage 130a inside the cylinder head 130, where the heat of the cylinder head 130 is removed,
It is discharged from the outlet 130o, and then enters the second heat exchange chamber 6 of the heat exchanger 1 from the inlet 6i again.

The upper portion of the first heat pipe 1 is inside the second heat exchange chamber 6, and the outer surface is in contact with the circulating second cooling liquid R2 as described above. In the steady state, the temperature of the second cooling liquid in that region is lower than the temperature of the boiled first working fluid S1, and the first working fluid S1 is cooled and condensed to become a liquid. It goes down the pipe wall and falls to the lower part.

On the other hand, the second cooling liquid R2 whose temperature has risen due to the heat taken from the first working fluid S1 moves further above the coupling portion 3. Then, the second working fluid S2 sealed in the second heat pipe 2 deprives the second cooling liquid R2 of the evaporation heat and boils to become vapor, which moves upward inside the second heat pipe 3. Then, the second cooling liquid R2 is deprived of heat so that the temperature thereof decreases, and the second cooling liquid R2 exits from the outlet 5o again in a cooled state.

The second working fluid S2 boils and becomes a gas and moves upward in the second heat pipe 3 to reach the portion of the second heat pipe 3 to which the fins 15 are attached.
When the temperature of the air around the fins 14 is lower than the temperature of the evaporated second working fluid S2, the surrounding air draws heat from the second working fluid S2 via the fins 15 and the second heat pipes 3, and the second operation is performed. The fluid S2 condenses into a liquid and travels along the pipe wall of the second heat pipe 3 and falls to the lower portion. Therefore, since the first heat pipe 2 radiates the heat from the first cooling liquid R1 to the second cooling liquid R2, the heat transfer coefficient is much larger than that to the heat radiating to the air, and the heat radiating portion of the first heat pipe 2, That is, the portion that comes into contact with the second cooling liquid R2 can be made compact. On the other hand, the temperature of the second cooling liquid R2 rises because heat from the first cooling liquid R1 is applied, the amount of heat received by the second heat pipe 3 increases, and the amount of evaporation of the second working fluid S2 due to boiling increases. To do. As a result, the amount of heat received by the heat radiating portion of the second heat pipe 3 per unit time becomes large, and when the two heat exchangers disclosed in JP-A-6-159888 are simply arranged in parallel and used. When the heat radiation amount is the same as that of the heat pipes, the heat radiation portion can be made compact.

On the other hand, when the engine is started in the cold state and warmed up, the following occurs. Since the cylinder head portion of the engine generates a larger amount of heat than the cylinder block portion, the second cooling liquid R passing through the cooling liquid passage around the cylinder head portion.
In the case of 2, the temperature rises first. Here, the operating characteristics of the first working fluid S1 have the characteristics shown in FIG.
Therefore, when the temperature of the second cooling liquid R2 rises, heat is transferred to the first cooling liquid via the main body of the first heat pipe 2 by heat conduction. In addition, the first working fluid S1 is slightly evaporated by the second cooling liquid R2, and the first cooling liquid R1 absorbs heat to condense and the heat is also transferred to the first cooling liquid R1 by evaporation. As a result, the first cooling liquid is heated by the second cooling liquid, and the temperature rise of the second cooling liquid is promoted. As described above, the second cooling liquid whose temperature has risen first gives heat to the cylinder block wall, so that the viscosity of the oil flowing inside the cylinder block is reduced and consequently the friction of the engine is reduced. Further, since the heat pipe plays the role of the thermostat as described above, it is not necessary to interpose a plurality of thermostats in the cooling system path as in the conventional case, and the flow resistance of the cooling liquid is reduced.

As described above, according to this embodiment, when the engine is warmed up, the heat of the cooling liquid flowing on the cylinder head side can be applied to the cooling liquid flowing on the cylinder block side.
It is possible to accelerate the temperature rise of the cooling liquid flowing on the cylinder block side, as compared with the two-system cooling device in which the heat dissipation portions of the two-system cooling circuits are completely separated. Further, in this embodiment, two heat exchangers are integrated, and one electric motor further circulates the cooling fluid in two systems and rotates the radiation fins, so that the number of parts is reduced and the number of mounting steps is reduced. However, conversely, if the heat pipe is fixed and the cooling water is circulated by a separately provided water pump, and the heat is taken from the radiating fins by a separately provided blower, controllability is improved. It is possible to

[0024]

In the heat exchanger according to claim 1 of the present invention,
Since the heat is transferred from the higher temperature of the cooling liquid to the lower temperature of the two systems, the heat transfer efficiency is good. The cooling liquid having a low temperature receives heat from the cooling liquid having a high temperature, and the temperature difference between the cooling liquid and the air becomes large, so that the heat radiation amount increases. Therefore, it is possible to make the heat exchanger compact. Further, in the cooling device according to the second aspect, the heat of the cylinder head portion can be transferred to the cylinder block portion when the engine is warmed up.
Warm-up of the cylinder block is improved, and it is possible to prevent an increase in friction of the cylinder block portion.

[Brief description of drawings]

FIG. 1 is a diagram showing the structure of a two-system cooling heat exchanger according to the present invention.

FIG. 2 is a diagram showing operating characteristics of a working fluid.

3 is an overall view of a cooling device using the two-system cooling heat exchanger of FIG.

FIG. 4 is a first cooling liquid for cooling the cylinder block portion;
It is a figure which shows the temperature change after the cold start of the 2nd cooling liquid which cools a cylinder head part.

[Explanation of symbols]

 1 ... 2 system cooling heat exchanger 2 ... 1st heat pipe 3 ... 2nd heat pipe 5 ... 1st heat exchange chamber 5i ... 1st heat exchange chamber inlet 5o ... 1st heat exchange chamber outlet 6 ... 2nd Heat exchange chamber 6i ... Inlet of second heat exchange chamber 6o ... Outlet of second heat exchange chamber 8 ... Motor 9, 10, 11 ... Seal member 12 ... Spiral fin 13 ... Spiral fin 14 ... Spiral fin 15 ... Fin 100 ... Engine 110 ... Head gasket 120 ... Cylinder block part 120a ... Coolant passage of cylinder block part 120i ... Coolant passage inlet of cylinder block part 120o ... Coolant passage outlet of cylinder block part 130 ... Cylinder head part 130a ... Cylinder head part Cooling liquid passage 130i ... Inlet of cooling liquid passage of cylinder head portion 130o ... of cooling liquid passage of cylinder head portion Mouth

Claims (2)

[Claims] 1. A first heat pipe enclosing a first working fluid that boils when heated to a predetermined temperature or higher, and the first working pipe is connected to the first heat pipe at an end portion in the longitudinal axis direction, and the first working fluid. A second heat pipe enclosing a second working fluid that boils when heated to a lower predetermined temperature or higher; a first heat exchange chamber arranged so as to cover only the first heat pipe; A second heat exchange chamber arranged to continuously cover both the first heat pipe and the second heat pipe with a connecting portion sandwiched therebetween; and outside the second heat pipe outside the second heat exchange chamber. A heat radiating member attached to the surface, and allows a first cooling liquid to be cooled to pass through the first heat exchange chamber and a second cooling liquid to be cooled to pass through the second heat exchange chamber. A two-system cooling heat exchanger. 2. A first heat pipe enclosing a first working fluid that boils when heated to a predetermined temperature or higher, and the first working pipe is connected to the first heat pipe at an end portion in the longitudinal axis direction, and the first working fluid. A second heat pipe enclosing a second working fluid that boils when heated to a lower predetermined temperature or higher; a first heat exchange chamber arranged so as to cover only the first heat pipe; A second heat exchange chamber arranged to continuously cover both the first heat pipe and the second heat pipe with a connecting portion sandwiched therebetween; and outside the second heat pipe outside the second heat exchange chamber. A two-system cooling heat exchanger including a heat-dissipating member mounted on a surface, a cylinder block cooling liquid for cooling a cylinder block portion of an engine is passed through the first heat exchange chamber, and an engine is provided through the second heat exchange chamber. Cool the cylinder head of A two-system cooling system for an engine that allows a cylinder head coolant to pass through.