JPH0486483A - Heat exchanger - Google Patents

Abstract

PURPOSE:To prevent unsteadiness of short-size tube and improve the strength of the whole of a heat exchanger by abutting the end of a short-size header against the outermost side tubes of a neighboring group of tubes. CONSTITUTION:Tubes 1 includes two kinds of tubes having different lengths and the group 1a of short tubes and the group 1b of long tubes are formed. A left header 3 is constituted of one piece of long size continuous header while right headers 4 is constituted of two pieces of upper and lower short-size headers 4a, 4b and the upper right short-size header 4a is retreated to inside than the right lower short-size header 4b thereby forming a recessed part 6 at the right upper corner of a heat exchanger. The recessed part 6 is formed for avoiding an obstacle X. The right side short-size headers 4a, 4b are separated and the strength thereof is not so strong whereby the lower end of the right upper short-size header 4a is abutted against the uppermost stage tube 1 of the group 1b of the long-size tubes to correct a structural weak point thereby improving the strength of the same.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger, particularly a multi-flow heat exchanger suitably used as a condenser for a car cooler.

Conventional technology For example, in a heat exchanger used as a condenser for a car cooler, a multi-hole extruded flat tube called a harmonica tube is bent into a serpentine shape, and fins are placed between the parallel parts to form a core part. Instead of the so-called serpentine type heat exchanger, the use of a so-called multi-flow type heat exchanger has been proposed and put into practical use. This multi-flow heat exchanger connects a large number of flat tubes between a pair of left and right pipe headers, arranges fins between adjacent tubes, and partitions the inside of the header at appropriate positions in the length direction. By partitioning with parts,
A meandering refrigerant circuit is formed from the refrigerant inlet at the upper end of one header to the refrigerant outlet at the lower end of the other header.

By the way, in automobiles, due to the trend of shrinking engine compartments due to the recent expansion of living space, the placement of heat exchangers in the engine compartment is also becoming more efficient by eliminating wasted space in relation to other equipment, etc. It is requested that this be deployed. Therefore, if there are obstacles that prevent the placement of the heat exchanger in the engine room, the core part is placed between the fins and It consists of multiple tube groups of different lengths with intervening tubes, and one end of the tubes is aligned and connected to a common long header, while the other end is connected separately for each tube group. It has been proposed to communicate with a short header of the tube and form a recess into which a portion of the header is recessed at one end in the length direction of the tube (see, for example, Japanese Utility Model Application Publication No. 74989/1989).

Problems to be Solved by the Invention However, the above heat exchanger has the following drawbacks. In other words, one end of each tube group is connected to a common long header to ensure sufficient strength, while the other end is connected to separate short headers to ensure that the adjacent tubes have sufficient strength. The tube groups were only connected by fins interposed between them, and the strength was insufficient.

The present invention has been made to solve the above-mentioned problems, and the present invention has been made to solve the above-mentioned problems. The object of the present invention is to provide a heat exchanger having sufficient strength even though it has a recessed part where a part of the header is recessed.

As a means for solving the problem, the present invention has a plurality of tube groups of different lengths in which flat tubes and fins are stacked in an alternating arrangement, and one end of each tube is connected to a common tube. One end is connected to a long header, while the other end is connected to a separate short header for each tube group, thereby forming a recess into which the header retracts at one end in the length direction of the tube. At the end of the short header,
The gist of the heat exchanger is that it is brought into contact with the outermost tube of a group of adjacent tubes.

In order to further improve the strength, the ends of the short header were
It is preferable that the tubes are joined and integrated in a state where they are brought into contact with the outermost tubes of the adjacent tube group.

EXAMPLE The present invention will be described below based on an example in which the present invention is applied to a condenser for a car air conditioner.

In the embodiments shown in FIGS. 1 to 5, (1) is a plurality of flat tubes arranged vertically in a horizontal state;
(2) is a corrugated fin interposed between the adjacent tubes (1) (1).

The tube (1) is made of a flat extruded aluminum material. For the purpose of improving pressure resistance, it is desirable to use a porous type tube (1), such as a so-called harmonica tube. However, in order to further reduce the thickness of the tube (1) and improve heat exchange performance, an electric resistance welded tube or the like may be used instead of the extruded material. When using an electric resistance welded pipe, an inner fin material formed into a corrugated shape in the width direction is separately inserted into the pipe and brazed to the inner surface of the pipe wall, so that the fin material functions as a reinforcing member and achieves the required resistance. It is desirable to obtain pressure.

The tubes (1) include two types of different lengths, the short tubes (1) are collected at the top to form a short tube group (1a), and the long tubes (1) are collected at the bottom. and form a long tube group (1b). Each tube (1) is arranged with its left end aligned at the same vertical position.

The corrugated fins (2) include two types of lengths, long and short, corresponding to the length direction of the tube (1).

That is, short fins (2) are interposed between each tube in the short tube group (1a), and the long tube group (1b
), a long fin (2) is interposed between each tube. A short fin (2) is interposed between the short tube group (la) and the long tube group (lb). Each of these corrugated fins (2) has approximately the same width as the tube (1), and is brazed with a brazing material coated on the surface of the tube (1) or the surface of the fin (2). 1) are joined and integrated. The corrugated fins (2) are also made of aluminum, preferably with louvers cut and raised. In addition, instead of the corrugated fin, a plate-like fin having a notch for fitting the tube on the - side edge is used,
These may be arranged parallel to the header at predetermined intervals.

(3) and (4) are left and right headers. Left header (3
) consists of two long headers, while the right header (4) consists of two short headers (4a) (4b)
). These headers (3) and (4) are made of hollow extruded aluminum members with a circular cross section and have high pressure resistance. Note that instead of the extruded material, a molded pipe may be used in which a double-sided or single-sided plating sheet is molded into a cylindrical shape and the abutting portions are joined by electric resistance welding or brazing. Each header (3) (4) is provided with tube insertion holes (5) at predetermined intervals along its length.

The left end of each tube (1) of both long and short tube groups (la and lb) is inserted into the insertion hole (5) of the left header (3), and the short tube is inserted into the insertion hole (5) of the short header (4a) on the upper right. The right end of each tube (1) of the group (1a) is inserted into the insertion hole (5) of the short header (4b) on the lower right side of the long tube group (1a).
1b) is inserted into the right end of each tube (1),
Strongly joined and connected by brazing. Therefore,
In the connected state of such a header, the tube (1)
At the right end of the tube, the tube (1) is inserted further inward along the length of the tube (1) than either the upper right short header (4a) or the lower right short header (4b), so that the upper right corner of the condenser A recess (6) is formed in the portion. This concave portion (6) is designed to avoid obstacles (X) when arranging the condenser.
This is to avoid. Furthermore, each header (3
) (4a) The upper and lower ends of (4b) are respectively lids (
7) is occluded. Also, the short header on the top right (
One end of a refrigerant inlet vibe (8) arranged along the outside of the lower right short header (4b) is connected to the outer lower part of 4a), while the inner lower part of the lower right short header (4b) One end of a refrigerant outlet vibrator (9) is connected in communication with the refrigerant outlet vibrator (9).

Also, the left header (3) and the short header at the bottom right (4
The inside of b) is partitioned in the length direction by a partition member (1o), so that the refrigerant flowing from the refrigerant inlet vibrator (8) is directed to the upper short tube group (1a) as shown in FIG. Flow through each tube (1) to the left header (3
), the refrigerant is reversed, meandering through each tube (1) of the long tube group (1b), and flows out from the refrigerant outlet vibrator (9). During this time, the air circulation gap including the corrugated fins (2) formed between the tubes (1) (1) exchanges heat with the air flowing in the direction shown by the arrow in Fig. 3 and condenses. . In Figure 1, (11) (12)
is a side plate placed on the outside of the corrugated fin (2) placed on the outermost side.

The lowermost tube (1) of the short tube group (1a) and the uppermost tube (1) of the long tube group (1b) are connected by a corrugated fin (2) interposed between them. , the short header (4a) on the upper right and the short header (4b) on the lower right are separated, making the structure weaker in strength. Therefore, in order to compensate for this structural weakness, the lower end of the short header (4a) at the top right is brought into contact with the uppermost tube (1) of the long tube group (1b). In order to further improve the strength,
It is desirable to join and integrate the two in a state where they are in contact with each other as described above.

This joining can be accomplished by using a lid (7) of the tube (1) or header (4a) with a brazing material layer coated on the surface of either or both of them. 2), header (3
) It is advantageous that the heat exchanger components such as those in (4) can be brazed easily and reliably in a furnace.

FIG. 6 shows an embodiment of the invention. In this embodiment, the tube (1゛) is a short tube group (la').
) in the middle, and above and below it are long tube groups (lb'
) (lc') are arranged. The left end of each tube (1°) is connected to a common header (3'), while the right end of each tube (1°) is connected to each tube group (la') (lb') (lc ' )
Three short headers (4a') (
4b') (4c'), respectively. Therefore, in this embodiment, the right middle header (4a'
) is retracted inward along the length of the tube, thereby forming a recess (6°) in the middle of the right end of the condenser to avoid the obstacle (X). It is said that In addition, the lid body (7') that covers the upper end of the right intermediate header (4a') is attached to the upper long tube group (
The lid body (7°), which is brazed and integrated with the tube (1') at the lower end of the header (4a') and covered with the lower end of the header (4a'), is attached to the lower end of the tube (1'). The tube group (ie') is integrally brazed with the tube (1') at the upper end in contact with the tube (1'). Also left header (3°)
A refrigerant inlet pipe (8') and a refrigerant outlet pipe (9°) are attached to the upper and lower ends of the refrigerant, respectively. Furthermore, the left header (3
A partition member (10 °) is provided with a partition member (10
) is provided so that the refrigerant flows in a meandering manner through the refrigerant passage constituted by the tube group.

In addition, in the above embodiment, a case was shown in which one of the four parts for obstacle avoidance was formed, but depending on the situation of the obstacle, a plurality of four parts could be formed, or the recessed part could be formed into a stepped shape. The present invention is also applicable to those formed in the following manner.

Effects of the Invention As described above, in the heat exchanger according to the present invention, one end of a plurality of tube groups having different lengths is communicatively connected to a common long header, while the other end is connected to each tube group. Each of the tubes is connected in communication with a separate short header, and a recess into which the header retracts is formed at one end in the length direction of the tube. Therefore, by changing the formation position, size, etc. of this recessed part as appropriate depending on the obstacle, it is possible to prevent the occurrence of wasted space, as would be the case when the entire heat exchanger is reduced in size to avoid the obstacle. Heat exchangers can be placed to avoid this.

In addition, since the end of the short header is in contact with the outermost tube of the adjacent tube group, it is possible to prevent wobbling on the short header side, thereby increasing the strength of the heat exchanger as a whole. You can improve your performance.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall front view of the heat exchanger, FIG. 2 is a plan view of the same, and FIG. 3 is an enlarged sectional view taken along the line 4 is a perspective view showing the header, tubes and fins in a separated state, FIG. 5 is a circuit diagram showing the flow of refrigerant, and FIG. 6 is an overall front view of a heat exchanger showing another embodiment. (1) (1')...Flat tube, (la)
(la')...Short tube group, (lb) (l
b' ) (Ic') - Long tube group, (3)
(3°)...Long header = (4) (4a)
(4b) (4a') (4b') (4
c')...Short header (6)...Concavity. That's it for Mayuzumi J-no Figure 2 Figure 3

Claims (1)

[Claims] It has a plurality of tube groups of different lengths in which flat tubes and fins are stacked in an alternating arrangement, and one end of each tube is communicatively connected to a common long header. In a heat exchanger in which the same end is connected to a separate short header for each tube group, and a recess into which the header retracts is formed at one end of the tube in the length direction, the short header A heat exchanger characterized in that an end portion of the heat exchanger is in contact with an outermost tube of an adjacent tube group.