Heat exchange – Three non-communicating fluids
Reexamination Certificate
1998-07-28
2001-01-09
Leo, Leonard (Department: 3743)
Heat exchange
Three non-communicating fluids
C165S135000, C165S146000
Reexamination Certificate
active
06170565
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a heat exchanger which is produced by assembling two heat exchangers, which are used differently by disposing them upstream and down stream of a direction that air is flown, so to be formed into a single unit as a whole.
BACKGROUND ART
Conventionally, there is known a heat exchanger, which is made of two heat exchangers, which are used differently. Such a heat exchanger is proposed to have a first heat exchanger, which is configured to have tubes and fins between a pair of tanks, and a second heat exchanger, which is also configured in the same way as the first heat exchanger, both disposed in parallel to each other and integrally connected to each other as described in, for example, Japanese Utility Model Publication No. Hei 6-45155 and Japanese Patent Application Laid-Open Publication No. Hei 7-332890.
Japanese Utility Model Application Laid-Open Publication No. Hei 2-54076 proposes a heat exchanger having a first heat exchanger and a second heat exchanger which are formed into one body, which is configured by stacking flat plate fins, connecting to communicate a plurality of tubes with the plate fins, connecting ends of the tubes to an end plate configuring a tank, and assembling a tank plate to the end plate, wherein the end plate and the tank plate are separately formed or the tank plate is separately formed.
There is also known another heat exchanger, which is produced with two different heat exchangers assembled in series vertically or horizontally. As described in, for example, Japanese Utility Model Publication No. Sho 59-16692 and Japanese Utility Model Application Laid-Open Publication No. Hei 2-36772, there is proposed a heat exchanger which is in a single form structurally but actually has two heat exchangers by disposing tubes and fins between a pair of tanks and a partition plate at the midpoint of the pair of tanks.
Such a heat exchanger has the tanks and tubes to form a heat exchange medium passage and the fins to form an air passage. And, a heat exchange medium supplied from the tank is flown through the plurality of tubes to make heat exchange with the exterior by means of the fins.
The fin is formed to have a corrugated side view with the same pitch by passing a flat fin material through gear-shaped rolls, which are vertically disposed in several sets to shrink the fin material in a longitudinal direction or to compress it. And, in view of improvement of the heat exchange rate and an airflow resistance, the fins are generally formed with louvers on surfaces thereof, and the louvers are formed by the rolls when the fins are formed into the corrugated shape.
In the conventional heat exchanger formed by combining two heat exchangers, the fins disposed between the tubes are often integrally formed and disposed in the first and second heat exchangers. But, the individual heat exchanger has different use, performance and requirements of different heat radiation degrees and airflow resistances. Therefore, where the fins are formed to conform to the performance of one of the heat exchangers, the heat exchange rate of the other heat exchanger is lowered.
Accordingly, the fins connected to the first heat exchanger are separately formed from those connected to the second heat exchanger. But, it is not desirable to form the fins separately for the first and second heat exchangers because the number of parts increases and workability becomes complicated.
In view of the above, the present invention aims to provide a heat exchanger which can have an improved heat exchange performance with the above-described disadvantages remedied without forming the fins separately for the first and second heat exchangers.
SUMMARY OF THE INVENTION
The invention relates to a heat exchanger which comprises tubes for configuring a first heat exchanger and tubes for configuring a second heat exchanger, the tubes being disposed upstream and downstream of a direction that air is flown, fins integrally formed and disposed between both the tubes, and ends of the respective tubes connected into the respective tanks, wherein the fins have louvers, which are formed into a group of louvers formed on the fins disposed in the first heat exchanger and a group of louvers formed on the fins disposed in the second heat exchanger, the two groups having a different shape of louvers.
The invention relates to the heat exchanger above, wherein the two groups of louvers of the fins are formed to have a difference at least in louver angle, slit length, the number of louver members, or width.
The invention relates to the heat exchanger above, wherein the two groups of louvers of the fins have a different opening direction.
The invention relates to the heat exchanger above, wherein the two groups of louvers of the fins are of the same type but opened toward an opposite direction.
The invention relates to the heat exchanger above, wherein the tubes and the fins are integrally assembled and brazed in an oven.
The invention relates to the heat exchanger above, wherein the tubes, the fins and the tanks are integrally assembled and brazed in an oven.
The invention relates to the heat exchanger above, wherein the tubes, the fins and tank segments that are stacked to form the tank are integrally assembled and brazed in an oven.
The invention relates to the heat exchanger above, wherein the tubes, the fins and end plates are brazed in an oven and thereafter connected to the tanks.
The invention relates to the heat exchanger above, wherein the tubes have a U-turn shaped passage.
Therefore, the invention can perform heat exchange without degrading the heat exchange requirements of the respective heat exchangers because the air flowing through the fins is differently flown between the first and second heat exchangers.
For example, when the heat exchanger which is formed to have the radiator and the condenser integrally formed has fins integrally formed between the radiator and the condenser, the fins are determined to have a louver angle, slit length, the number of louver members and width to satisfy the requirements (a heat radiation degree and an air-flow resistance) of the condenser.
Meanwhile, the same fins as above are also formed on the radiator, but since the heat exchange performances required by the radiator and the condenser are different, the radiator often does not satisfy the required performance when the same fins as in the condenser are disposed therein. Therefore, the louvers having a different shape from those disposed in the condenser are formed on the fins disposed in the radiator, so that the requirement of the radiator is fulfilled and the heat exchange performance of the radiator can also be improved.
As described above, where two heat exchangers such as a radiator and a condenser which have difference performances are formed into one heat exchanger body, such heat exchanger has an advantage of improving the heat exchange rate of the individual heat exchangers by disposing fins which are formed to have louvers of a different shape for each fin disposed in the respective heat exchangers, without changing a fin pitch width and the like and with the requirements of performance of the individual heat exchangers fulfilled.
And, since the integrally formed fins are disposed between the respective heat exchangers, assembling property of the tubes is improved. And, the number of parts is reduced, and the production process is made easy. Thus, when the heat exchanger is made of heat exchangers having different performances, a space for installing the heat exchanger is decreased, and the lightweight can be achieved. Therefore, an apparatus having the heat exchanger can be made compact, and the number of steps for installation can also be decreased.
As described above, the present invention has two groups of louvers with different shapes formed on the fins to fulfill the requirements of the individual heat exchangers, resulting in improving the heat exchange rate of the heat exchanger as a whole.
It is preferable to configure the heat exchanger as described in embo
Kanesaka & Takeuchi
Leo Leonard
Zexel Corporation
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