Laminate type evaporator

Details Laminate type evaporator Laminate type evaporator

2002-12-16

2004-06-01

Bennett, Henry (Department: 3743)

Heat exchange

Radiator core type

Deformed sheet forms passages between side-by-side tube means

C165S174000, C165S176000

Reexamination Certificate

active

06742577

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laminate type evaporator for an air conditioner.
2. Description of the Related Art
FIG. 9
is a perspective view showing the refrigerant flow passage construction of a conventional laminate type evaporator,
FIG. 10
is a plan view of a flat tube used in a laminate type evaporator that constitutes a refrigerant pipe through which refrigerant is passed, and
FIG. 11
is an exploded perspective view of the flat tube.
In the laminate type evaporator
1
shown in
FIG. 9
, a large number of flat tubes
2
as shown in
FIG. 10
are arranged in parallel at intervals, and corrugate fins (not shown) are provided between the adjacent flat tubes
2
, whereby the flat tubes
2
and the corrugate fins are alternately laminated together; in the laminated state, these components are integrally brazed to each other.
As shown in
FIG. 11
, each flat tube
2
is composed of a pair of press-molded plates
2
a
and
2
b
with their ends being deep-drawn; the pair of plates are opposed and joined to each other. At the top end of the flat tube, there are formed in parallel a first upper tank portion
31
and a second upper tank portion
32
constituting an inlet side or an outlet side for refrigerant. At the lower end of the flat tube, there are formed in parallel a first lower tank portion
41
and a second lower tank portion
42
constituting the inlet side or the outlet side for refrigerant.
These tank portions are formed by joining together the molded plates
2
a
and
2
b
opposed to each other. That is, the first upper tank portion
31
is formed by joining together a tank forming portion
31
a
of the molded plate
2
a
and a tank forming portion
31
b
of the molded plate
2
b
, and the second upper tank portion
32
is formed by joining together a tank forming portion
32
a
of the molded plate
2
a
and a tank forming portion
32
b
of the molded plate
2
b
. Further, the first lower tank portion
41
is formed by joining together a tank forming portion
41
a
of the molded plate
2
a
and a tank forming portion
41
b
of the molded plate
2
b
, and the second lower tank portion
42
is formed by joining together a tank forming portion
42
a
of the molded plate
2
a
and a tank forming portion
42
b
of the molded plate
2
b.
From the portion between the first upper tank portion
31
and the second upper tank portion
32
to the portion between the first lower tank portion
41
and the second lower tank portion
42
, there extends a partition
6
, which is formed by joining together the bottom surfaces of a partition groove
6
a
of the molded plate
2
a
and a partition groove
6
b
of the molded plate
2
b
. By this partition
6
, there are defined two flow passages through which refrigerant flows: a first refrigerant flow passage
51
and a second refrigerant flow passage
52
. The first refrigerant flow passage
51
is a linear flow passage connecting the first upper tank portion
31
and the first lower tank portion
41
; it is formed between a refrigerant flow passage forming portion
51
a
of the molded plate
2
a
and a refrigerant flow passage forming portion
51
b
of the molded plate
2
b
. Further, the second refrigerant flow passage
52
is a linear flow passage connecting the second upper tank portion
32
and the second lower tank portion
42
; it is formed between a refrigerant flow passage forming portion
52
a
of the molded plate
2
a
and a refrigerant flow passage forming portion
52
b
of the molded plate
2
b.
In this way, the laminate type evaporator
1
is formed by alternately laminating together a large number of flat tubes
2
and corrugate fins. Further, as shown in
FIG. 9
, a side refrigerant passage
3
is provided at one refrigerant inlet/outlet side surface portion
1
F of the laminated flat tubes
2
. Further, a side refrigerant passage
4
is provided at the other side surface portion
1
B. At the position of the side refrigerant passage
3
in the vicinity of the first upper tank portion
31
, there is provided a refrigerant inlet Rin through which refrigerant flows into the laminate type evaporator
1
. Further, at the position of the side refrigerant passage
3
in the vicinity of the second upper tank portion
32
, there is provided adjacent to the refrigerant inlet Rin a refrigerant outlet Rout through which refrigerant flows out of the laminate type evaporator
1
. The side refrigerant passage
3
communicates with the refrigerant inlet Rin and the first lower tank portion
41
of that flat tube
2
out of the laminated flat tubes
2
, which is nearest to the side refrigerant passage
3
side.
Further, in the middle portion with respect to the laminating direction of the first lower tank portion
41
of the laminated flat tubes
2
, there is provided a partition portion
18
. Here, the partition portion
18
is formed such that no refrigerant communicates between the lower tank portions
41
of the adjacent flat tubes
2
with the partition portion
18
therebetween. In the middle portion of the second upper tank portion
32
of the laminated flat tubes
2
, there is provided a partition portion
19
. The partition portion
19
is formed such that no refrigerant communicates between the second upper tank portions
32
of the adjacent flat tubes
2
with the partition portion
19
therebetween.
In this way, the partition portions
18
and
19
respectively divide the first lower tank portions
41
and the second upper tank portions
32
laminated together such that the ratio of the number n
2
of flat tubes on the refrigerant inlet/outlet side surface portion
1
F side to the number n
1
of flat tubes on the opposite side, i.e., on the side surface portion
1
B side, is substantially 1:1.
Of the first refrigerant passages
51
of the flat tubes
2
laminated together and the first upper tank portions
31
and the first lower tank portions
41
at the ends thereof, those situated on the side refrigerant passage
3
side with respect to the partition portion
18
constitute a first block B
1
in which refrigerant flows as refrigerant flow R
1
from the first lower tank portions
41
to the first upper tank portions
31
. Of the first refrigerant passages
51
of the flat tubes
2
laminated together and the first upper tank portions
31
and the first lower tank portions
41
at the ends thereof, those situated on the side refrigerant passage
4
side with respect to the partition portion
18
constitute a second block B
2
in which refrigerant flows as refrigerant flow R
2
from the first upper tank portions
31
to the first lower tank portions
41
.
Further, of the second refrigerant passages
52
of the flat tubes
2
laminated together and the second upper tank portions
32
and the second lower tank portions
42
at the ends thereof, those situated on the side refrigerant passage
4
side with respect to the partition portion
19
constitute a third block B
3
in which refrigerant flows as refrigerant flow R
3
from the second upper tank portions
32
to the second lower tank portions
42
. Of the second refrigerant passages
52
of the flat tubes
2
laminated together and the second upper tank portions
32
and the second lower tank portions
42
at the ends thereof, those situated on the side refrigerant passage
3
side with respect to the partition portion
19
constitute a fourth block B
4
in which refrigerant flows as refrigerant flow R
4
from the second lower tank portions
42
to the second upper tank portions
32
.
In the laminate type evaporator
1
, constructed as described above, refrigerant flowing in through the refrigerant inlet Rin passes through the side refrigerant passage
3
as a refrigerant flow RSA, and enters an inlet side tank portion
10
consisting of the first lower tank portions
41
in the first block B
1
. Next, it flows through the first refrigerant passages
51
of the first block B
1
as refrigerant flow R
1
, and enters an outlet side tank portion
11
consisting of the first upper tank portions
31
in the first bl

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