Evaporator of automotive air-conditioner

Details Evaporator of automotive air-conditioner Evaporator of automotive air-conditioner

2000-06-29

2001-11-27

Walberg, Teresa (Department: 3742)

Refrigeration

Refrigeration producer

Compressor-condenser-evaporator circuit

C165S153000

Reexamination Certificate

active

06321562

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to improvements in an evaporator for an automotive air-conditioner.
Generally, an automotive air-conditioner comprises an evaporator for cooling air employed for air conditioning by evaporating refrigerant in the evaporator. Various types of evaporators have been proposed and in practical use. Japanese Patent Publication (Heisei) No. 7-39895 discloses an evaporator constituted by a plurality of heat-transfer tube plates made from a pair of pressed metal plates. As shown in
FIGS. 22 and 23
, this conventional evaporator
101
is constituted by a core
111
having a plurality of U-shaped refrigerant passages and corrugated fins, and first to fourth tank passages
103
to
106
. The core
111
is separated into first and second cores. Refrigerant is supplied from a refrigerant inlet
107
to the first tank passage
103
, and flows through the U-shaped refrigerant passages
102
a
of the first core, the second tank passage
104
, the third tank passage
105
, the U-shaped refrigerant passage
102
b
of the second core in the order of mention. Thereafter, the vaporized refrigerant due to heat exchanger in the core
111
flows out through a refrigerant outlet
108
installed to the fourth tank passage
106
. This conventional evaporator
101
is arranged to provide choke portions
112
in the first and third tank passages
103
and
105
so that the refrigerant is equivalently distributed to the heat-transfer tube elements.
SUMMARY OF THE INVENTION
However, there is a possibility that this conventional evaporator
101
may generate noise due to the refrigerant flow in the third tank passage
105
. More specifically, in the third passage
105
, the refrigerant flow from the second passage
104
to projecting inlets of the heat-transfer tube elements will become complex, and a further installation of the choke plate
112
in the third tank passage
105
will further increase the noise due to the refrigerant flow in the third tank passage
105
. Further, there is another possibility that the conventional evaporator
101
may degrade its cooling performance by the provision of the choke plate
112
in the third tank passage
105
.
It is therefore an object of the present invention to provide an improved evaporator which improves its performances in reducing noise and in cooling capacity.
An evaporator according to the present invention is for an automotive air conditioner. The evaporator comprises first and second cores, first to fourth tank passages, refrigerant inlet and outlet, and a choke portion. The first core has a plurality of first refrigerant passages and a plurality of first air passages contacted with the refrigerant passages. The second core has a plurality of second refrigerant passages and a plurality of second air passages contacted with the refrigerant passages. The first tank passage is connected to inlets of the first refrigerant passages of the first core, and the second tank passage is connected to outlets of the first refrigerant passages of the first core. The third tank passage is connected to the second tank passage and inlets of the second refrigerant passages of the second core, and the fourth tank passage is connected to outlets of the second refrigerant passages of the second core. The refrigerant inlet is connected to the first tank passage, and the refrigerant outlet is connected to the second tank passage. The choke portion is installed in the fourth tank passage.


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WPI & JAPIO Abstract for JP 110337293 A, “Evaporator header has a constriction 8 in a partition 9”, 2 pages, Dec. 10, 1999.

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