Heat exchange – Three non-communicating fluids
Reexamination Certificate
1998-09-30
2001-02-06
Lazarus, Ira S. (Department: 3743)
Heat exchange
Three non-communicating fluids
C165S148000, C165S173000, C062S509000
Reexamination Certificate
active
06182744
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No.
9-268913
, filed on Oct. 1, 1997, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a heat exchanger apparatus for a vehicle, including an auxiliary radiator which is disposed on a cooling air upstream side of a refrigerant condenser in a refrigerating cycle to cool an exothermic component such as an inverter for controlling rotation of a driving motor.
2. Description of the Related Art
In a conventional refrigerating cycle of an automotive air conditioning apparatus, a refrigerant condenser is disposed on a cooling air upstream side of a radiator for cooling an automotive engine, and it is not necessary for a heat exchanger to be disposed on a cooling air upstream side of the refrigerant condenser.
Recently, however, a hybrid powered automotive, which runs using an engine and a motor together, has been developed to ease air pollution by exhaust gas from automotive engines. The hybrid powered automotive has an inverter for controlling rotation of the motor. The inverter has electronic components such as a power transistor, a calorific value from which is relatively large. Therefore, it is necessary for the hybrid powered automotive to use an auxiliary radiator for cooling the inverter. When the auxiliary radiator is cooling air type, it is desirable for the auxiliary radiator to be disposed at a position where outer air (cooling air) easily flows in to enhance the cooling effect of the radiator. As a result, in some cases, there arises necessity to disposed the auxiliary radiator on the cooling air upstream side of the refrigerant condenser.
In such an arrangement, high temperature air, which has abrosbed heat in the auxiliary radiator, flows into the refrigerant condenser to decrease a difference in temperature between the cooling air and refrigerant in the refrigerant condenser. This significantly loweres condensation capacity of the refrigerant condenser. Especially, in a case that the refrigerant condenser has a supercooling part for supercooling the refrigerant, the supercooling part can not sufficinetly exhibit the supercooling performance due to the rise of the cooling air temperature.
SUMMARY OF THE INVENTION
The present invention has been made based on the above problem. An object of the present invention is to prevent deterioration of capacity of a refrigerant condenser in a heat exchanger apparatus including an auxiliary radiator which is disposed on a cooling air upstream side of the refrigerant condenser to cool an exothermic component. Another object of the present invention is to prevent cooling capacity of a supercooling part of a refrigerant condenser from deteriorating due to high temperature air, in a heat exchanger apparatus including an auxiliary radiator which is disposed on a cooling air upstream side of the refrigerant condenser to cool an exothermic component.
To achieve the objects described above, a condenser has a core portion for cooling refrigerant and the core portion has a first region and a second region closer to an outlet of the condenser than the first region. An auxiliary radiator, which is disposed on a cooling air upstream side of the condenser, is disposed only to face the first region of the core portion. Accordingly, the second region where a temperature of the refrigerant is lowered most can directly receive cooling air which does not pass through the auxiliary radiator, i.e., does not absorb heat in the auxiliary radiator and has low temperature. Therefore, even when outer air has high temperature, a difference in temperature between the refrigerant and the cooling air at the second region of the core portion closer to the outlet is sufficiently secured to prevent the deterioration of capacity of the condenser.
When the condenser has a condensation part for condensing the refrigerant, a receiver for removing liquid refrigerant from the refrigerant condensed by the condensation part, and a supercooling part for supercooling the liquid refrigerant from the receiver, the auxiliary radiator faces the condenser except at least part of the supercooling part. That is, the part of the supercooling part does not face the auxiliary radiator. Accordingly, low temperature cooling air directly flows into the part of the supercooling part without absorbing heat in the auxiliary radiator. As a result, the deterioration of cooling capacity of the supercooling part can be prevented.
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Matsuno Takayoshi
Muraki Toshihiko
Nakamura Hiroki
Nonoyama Hiroshi
Suzaki Shunkichi
Denso Corporation
Harness Dickey & Pierce PLC
Lazarus Ira S.
McKinnon Terrell
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