JPH04340070A - Condenser - Google Patents

Abstract

PURPOSE:To improve heat exchange efficiency by partitioning a header so as to pass refrigerant in a zigzag manner in such a way that the sectional area of a refrigerant passage of at least one path of paths other than a first zigzag path is larger than that of the first path. CONSTITUTION:In a multiflow condenser with a recessed part, gas refrigerant entering from an inlet pipe 11 passes through a first path P1 comprising seven shorter tubes 3, then turns to and passes through a second path P2 comprising nine longer tubes 1, further turns to and passes through a third path, namely, a final path P3 comprising five longer tubes 1 and flows in liquefied state out of an outlet pipe 12. The sectional area of the passage of the final path P3 through which the liquefied refrigerant passes is so set as to be smaller than that of the first path P1, so that the inactive core parts of a heat exchanger can be decreased and the heat exchanger with excellent efficiency can be realized.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a metal heat exchanger made of aluminum or the like used in a car cooler condenser or the like.

0002

[Prior Art] Recently, so-called multi-flow type or parallel flow type heat exchangers, which can achieve high heat exchange performance and low pressure loss, have been preferably used as condensers for car coolers, for example. There is a tendency.

As shown in FIG. 3, this heat exchanger includes a large number of flat tubes (51) arranged in parallel;
A pair of hollow headers (52) (52) are connected to both ends of these tubes (51) in a communicating state, and a header (5
2) and the refrigerant inlet pipe (53) provided in the refrigerant outlet pipe (53).
4), and by partitioning the inside of the header (52) with the partition (55), the passage cross-sectional area of the refrigerant flowing inside the heat exchanger is reduced from the inlet side to the outlet side. In several embodiments, the refrigerant flows through the heat exchanger in a meandering manner. In addition,
The reason why the refrigerant passage cross-sectional area is reduced in this way is that in the condenser, the refrigerant enters in the form of a gas with a large volume, and is condensed and flows out in the form of a liquid with a small volume. This is to increase heat exchange efficiency by reducing the cross-sectional area of the passage through which the condensed liquid refrigerant flows, thereby reducing wasteful areas where heat exchange is inactive. Note that (56) is a corrugated fin.

By the way, in automobiles, due to the recent tendency to reduce the size of the engine room due to the expansion of living space,
Regarding the arrangement of the air conditioner condenser in the engine room, there is a need to eliminate wasted space in relation to other devices and to arrange it efficiently.

[0005] Therefore, when there is an obstacle that obstructs the placement of the condenser in the engine room, the above-mentioned multi-flow type condenser is used in order to avoid wasting space and avoid the obstacle. It is proposed to configure the following.

That is, for example, as shown in FIG.
A plurality of flat tubes (61) arranged in parallel (
Two groups of tubes (63) with different lengths consisting of (62)
(64) are arranged in parallel, both tube groups (63)
A long hollow header (65) is connected in communication with one end of the tube group (64) extending between them, and a short hollow header is attached to each of the other ends of both tube groups (63) and (64). (66) and (67) are connected in communication, and a short header (66) connected to the end of a tube group (63) consisting of short tubes (61) is connected to a long tube (
A recess (68) for avoiding obstacles is provided inwardly of the short header (67) connected to the end of the tube group (64) consisting of the tube group (62). .

[0007]

[Problems to be Solved by the Invention] However, as described above, the multi-flow type heat exchanger is
), there is a gap in the relationship between the optimal installation position of the partition (69) considering the flow of refrigerant and the optimal size and position of the recess (68) considering the installation space of the heat exchanger. As shown in FIG. 4, unless the headers (65), (66, and 67) are partitioned at multiple locations with partitions (69), the liquid/gas state of the refrigerant will often change. It became difficult to realize a gradual reduction in the cross-sectional area of the passage in consideration of the above, and as a result, the pressure loss on the refrigerant side became too large, which resulted in a disadvantage that the heat exchange efficiency worsened.

[0008] An object of the present invention is to provide a multi-flow condenser with recesses that can solve the above problems and improve the heat exchange efficiency in a well-balanced manner as a whole.

[0009]

[Means for Solving the Problems] To achieve the above object, the present invention provides a method in which a plurality of tube groups having different lengths each including a plurality of tubes arranged in a parallel state are arranged in a parallel state, and one end of the adjacent tube group is arranged in a parallel state. A hollow header is connected in communication in a crossed state, and a hollow header is individually connected in communication to each of the other ends of both the tube groups,
In a condenser in which a recessed portion of the header is formed in the core, the refrigerant passage in the header is at least one path other than the first meandering path so that the refrigerant flows in a meandering manner. The gist of the present invention is a condenser that is partitioned in such a manner that its cross-sectional area is larger than the cross-sectional area of a first pass refrigerant passage.

0010

[Operation] The above configuration does not adopt a refrigerant passage configuration that takes into account the liquid/gas state of the refrigerant, that is, a configuration in which the cross-sectional area of the refrigerant passage is reduced in a predetermined manner from the inlet side to the outlet side. . However, by adopting a refrigerant passage configuration in which the refrigerant passage cross-sectional area of at least one path other than the meandering first path is larger than the refrigerant passage cross-sectional area of the first path, the recessed multiflow condenser In many cases, it is possible to ensure a large passage cross-sectional area for each path, thereby reducing the pressure loss on the refrigerant side, and thereby improving the overall heat exchange efficiency.

[0011]

[Embodiment] Next, an embodiment in which the condenser of the present invention is applied to an aluminum condenser for a car cooler will be described with reference to the drawings. It goes without saying that the condenser of the present invention can also be applied to various types of condensers such as condensers for room air conditioners.

The condenser shown in FIG. 1 consists of a long tube group (2) in which 14 long flat tubes (1) are arranged in parallel, and a long tube group (2) in which 7 short tubes (3) are arranged in parallel. It has a short tube group (4) arranged and formed. These tube groups (2) and (4) are arranged with the long tube group (2) at the bottom and the short tube group (4) at the top.
And with one end of both tube groups (2) and (4) aligned,
They are arranged in parallel to each other.

[0013] A long hollow header (5) is placed across the ends of both tube groups (2) and (4) on the same side.
are connected in a communicating state, and short hollow headers (6) and (7) are individually connected in a communicating state to the other ends of the short tube group (4) and the long tube group (2), respectively. ing. As a result, a recess (9) into which the upper short header (6) is retracted is formed in the core (8).

[0014] Then, the fifth long tube from the bottom (1
) and the sixth long tube (1), the inside of the long header (5) is divided into upper and lower chambers by a partition (10). A refrigerant inlet pipe (11) is connected to the upper short header (6), and a refrigerant outlet pipe (12) is connected to the side surface of the lower end of the long header (5). In addition, (13) is a corrugated fin, (14)
) is a side plate for fin protection.

Each of the heat exchanger components is made of aluminum, and the heat exchanger is manufactured by, for example, assembling each component into a temporary assembly state, and then brazing the entire assembly together in the assembled state. This is done by joining and integrating the parts. In that case, header (5) (6) (7)
Although not shown, the temporary assembly of the tubes (1) and (3) is carried out, for example, by inserting the tubes into the headers (5), (6), and (7) through tube insertion holes in the form of circumferential slits formed on the circumferential sides of the headers (5), (6), and (7). This is done by inserting and arranging the ends of the flat tubes (1) and (2) so that they protrude in the opposite direction.

[0016] In the multi-flow condenser with recesses configured as described above, the gas refrigerant flowing in from the inlet pipe (11) changes direction after passing through the first path (P1) consisting of seven short tubes (3). It passes through the second pass (P2) consisting of nine long tubes (1), then changes direction and passes through the third pass (P2) consisting of five long tubes (1), that is, the final pass (
P3) and then flows out in liquid form from the outlet pipe (12). In this way, the first path of meandering (P1
), the refrigerant passage cross-sectional area of at least one of the other paths other than ) is set larger than the passage cross-sectional area of the first pass (P1). It is possible to increase the passage cross-sectional area of each path by reducing the number of meanderings, and it is possible to improve the overall heat exchange efficiency in consideration of pressure loss.

Furthermore, as in the illustrated embodiment, by setting the passage cross-sectional area of the final pass (P3) through which the liquid refrigerant passes smaller than that of the first pass (P1), heat exchange is inactive. The core portion can be reduced, and more efficient heat exchange can be achieved.

In another embodiment shown in FIG. 2, a tube group (4) consisting of 9 short tubes (3) and 25
Long tube group (2) consisting of book long tubes (1)
The 14th long tube from the bottom (1
) and the 15th long tube (1), the inside of the long header (5) is divided into upper and lower chambers by a partition (10), and between the 4th long tube (1) from the bottom and the 15th long tube (1)
Between the main long tube (1), the inside of the lower short header (7) is divided into upper and lower chambers by a partition (10). In this case, the gas refrigerant flowing from the inlet pipe (11) passes through the first path (3) consisting of nine short tubes (3).
After passing through P1), it changes direction and passes through the second pass (P2), which consists of 11 long tubes (1), and then changes direction and passes through the third pass, which consists of 10 long tubes (1). pass (P3), change direction and pass the fourth pass consisting of four long tubes (1), that is, the final pass (P
4) and flows out from the outlet pipe (12) as a liquid.

[0019]

Effects of the Invention As described above, the condenser of the present invention includes a plurality of tube groups having different lengths, each consisting of a plurality of tubes arranged in parallel, and one end of the adjacent tube group. A condenser in which a hollow header is connected in communication in a crossed state, and a hollow header is individually connected in communication to each of the other ends of the two tube groups, and a recess into which the header retracts is formed in the core, The inside of the above header is designed so that the refrigerant flows in a meandering manner.
The refrigerant passage cross-sectional area of at least one path other than the meandering first path is made larger than the refrigerant passage cross-sectional area of the first path. Therefore,
It is possible to ensure a large passage cross-sectional area for each path, thereby reducing the pressure loss on the refrigerant side, thereby making it possible to improve the overall heat exchange efficiency in such a multi-flow condenser with recesses.

[Brief explanation of drawings]

FIG. 1 shows a condenser according to an embodiment of the present invention, in which figure (a) is an overall front view and figure (b) is a plan view of the same.

FIG. 2 shows a condenser according to another embodiment of the present invention, in which FIG. 2A is an overall front view and FIG. 2B is a plan view of the same.

FIG. 3 shows a conventional condenser, in which figure (a) is an overall front view and figure (b) is an overall plan view.

FIG. 4 shows another conventional condenser, in which figure (a) is an overall front view and figure (b) is an overall plan view.

[Explanation of symbols]

1...Long tube 2...Long tube group 3...Short tube 4...Short tube group 5...Long header 6, 7…Short header 8...Core 9...Concavity 10...Partition P1...1st pass

Claims (1)

[Claims] [Claim 1] A plurality of tube groups having different lengths each consisting of a plurality of tubes arranged in parallel are arranged in parallel, and a hollow header is communicatively connected to one end of the adjacent tube group in a crossed state. , a hollow header is individually connected to the other ends of the two tube groups, so that the refrigerant flows in a meandering manner in the condenser in which a recess into which the header is recessed is formed in the core.
The inside of the header is partitioned in such a manner that the refrigerant passage cross-sectional area of at least one path other than the meandering first path is larger than the refrigerant passage cross-sectional area of the first path. condenser.