Exhaust heat recovering device

Abstract

A waste heat recovery system having a heat pipe provided with a heat switch function limiting an amount of heat transported to a condenser in accordance with the increase in the amount of heating of the evaporator, having the evaporator arranged at an exhaust pipe for carrying exhaust gas of the internal combustion engine, and having the condenser arranged in a cooling water passage for carrying cooling water of the internal combustion engine and using the heat pipe to transport waste heat of exhaust gas to cooling water, characterized in that an insulating part formed between the evaporator and condenser is provided with a wall part for preventing heat transmission from an external fluid.

Description

TECHNICAL FIELD[0001]The present invention relates to a waste heat recovery system using heat pipes to recover waste heat of exhaust gas of an internal combustion engine and utilizing it for heating cooling water of the internal combustion engine, for example, is suitably used for a vehicle provided with an internal combustion engine.BACKGROUND ART[0002]As a conventional waste heat recovery system, for example, as shown in the reference (Wolf Dietrich Munzel, Daimler-Benz AG, “Heat Pipes for Recovery from Exhaust Gas of a Diesel Engine in a Passenger Car”, Proc. of International Heat Pipe Conference in Grenouble, France, 1987, pp. 740-743), one is known where the evaporator among the evaporator and condenser of the heat pump is placed in an engine exhaust pipe and the condenser is brought into heat contact with the engine cooling water. In this waste heat recovery system, waste heat of the exhaust gas is transported to the engine cooling water by the heat pipes, whereby the engine c...

AI Technical Summary

Benefits of technology

[0005]The object of the present invention, in consideration of the above problem, is to provide a waste heat recovery system utilizing heat pipes which prevents condensation of the working medium at the insulating part and enables reliable heat transport from the evaporator to the condenser.

[0008]Due to this, even if the external fluid has a temperature lower than the cooling water temperature, the working medium inside the heat pipe (110) evaporated at the evaporator (110A) can be prevented from condensing at the insulating part (110C), so reliable heat transport from the evaporator (110A) to the condenser (110B) becomes possible.

[0010]Due to this, the flow of the external fluid is blocked by the wall part (160) and is prevented from striking the insulating part (110C), so by setting the minimum extent of the wall part (160), the working medium can be prevented from condensing at the insulating part (110C).

[0013]Further, when the amount of heat transported to the condenser (110B) due to the heat switch function increases, the heat conduction from the evaporator (110A) is blocked by the clearance (161), so the restriction of the heat transport will not be impaired.

[0015]Due to this, by providing just one location of the connector (140) with a seal (141), it becomes possible to evacuate the inside to a vacuum and seal in a working medium.

[0021]Due to this, it is possible to provide a waste heat recovery system (100) enabling the exhaust pipe (11) and cooling water passage (30) to be easily joined as a single heat exchanger.

Problems solved by technology

However, in this waste heat recovery system, no consideration is particularly seen regarding the heat of the insulating part formed between the evaporator and condenser.

For example, if the insulating part is struck by cooling air or another low temperature fluid, the working medium evaporated at the evaporator will end up being condensed at this insulating part and the waste heat of the exhaust gas will no longer be able to be transported to the condenser.

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