JPH11148796A - Combined heat exchanger and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate insertion of the tube end into a relevant header while enhancing the brazing performance by arranging first and second flat tubes closely each other on the upstream side and downstream side of air flow and bending both tubes on one end part thereof. SOLUTION: A combined heat exchanger comprises a large number of first and second flat tubes 1, 2 arranged closely and in parallel each other on the upstream side and downstream side of air flow in the direction orthogonal to the paper surface. The first tube 1 has the opposite ends inserted liquidtightly into the tube insertion hole of a first header 4 and the second tube 2 has the opposite ends inserted liquidtightly into the tube insertion hole of a second header 5. The first tube 1 is bent, at the opposite ends thereof, to recede from the second tube 2. The tubes 1, 2 are arranged commonly with a corrugated tin 3 which is provided, at each end thereof, with a cut 6 enlarging toward the header 4, 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to two heat exchangers,
The present invention relates to a composite heat exchanger integrated with a common corrugated fin, and particularly to a heat exchanger in which flat tubes of each heat exchanger are arranged close to each other, so that respective headers do not cause thermal interference with each other. The present invention relates to an exchanger and a method for manufacturing the same.

[0002]

2. Description of the Related Art A plurality of rows of tubes are inserted through a large number of plate fins, tubes in the front row communicate with a first header, tubes in a rear row communicate with a second header, and tubes in the first and second tubes. Composite heat exchangers that allow different heat exchange media to flow through each have been proposed.

[0003]

However, if the spacing between the rows in a plurality of rows of tubes is reduced, the first and second headers communicated in each row are too close to each other, and the ends of the tubes are separated from each other. It becomes difficult to insert the tube into the tube insertion hole of the header, and the reliability of the brazing may be impaired. Further, in the vicinity of each header, there is a possibility that the heat of the heat exchange medium is affected by heat between the lower heat exchanger and the higher heat exchanger. Further, there is a drawback that the attachment of the doorway pif connected to each header is deteriorated. Therefore, the present invention has the following configuration in order to solve the problem.

[0004]

According to the composite heat exchanger of the present invention, flat first and second tubes 1 and 2 are arranged in parallel in two rows on the leeward and leeward sides of the air flow, respectively. Then, a large number of corrugated fins 3 common to both rows of tubes 1 and 2 are fixed in contact with each other to form a composite core. The end of the second tube 2 is communicated with the second header 5 and the first tube 1 and the second tube 2
At least one end of each of the tubes is curved, and the two headers 4 and 5 are separated from each other. According to this composite heat exchanger, since the tubes are curved at the ends of the tubes at a distance from each other, the tube ends can be easily inserted into the respective headers. The attachment property is improved. At the same time, it is possible to prevent the influence of heat between the heat exchangers in the vicinity of each header and to improve the heat exchange performance of each as much as possible. At the same time, the degree of freedom of the inlet / outlet pipe connected to each header is increased, and the degree of freedom of piping layout in a narrow place is increased. In addition, since the respective tubes are close to each other except for the vicinity of the headers 4 and 5, the composite heat exchanger is compact and easy to handle.

According to a second aspect of the present invention, flat first tubes 1 and second tubes 2 are arranged in parallel in two rows on the leeward and leeward sides of the air flow, respectively. , 2
A large number of corrugated fins 3 are fixed in contact with each other to form a composite core, the end of each of the first tubes 1 communicates with the first header 4, and the end of the second tube 2 connects with the second header 2. 5, the corrugated fin 3 is formed with a cut 6 at an intermediate position in the width direction only at a portion close to the headers 4, 5, and the cut 6 expands toward the headers 4, 5. The composite heat source is characterized in that at least one end of each of the first tube 1 and the second tube 2 is curved in the direction, and the headers 4 and 5 are separated from each other. It is an exchanger. According to this composite heat exchanger, in addition to the action of the heat exchanger according to the first aspect, the cut 6 is further expanded toward the headers 4 and 5, so that the heat on the windward side at both ends of the core. The heat effect of the heat exchanger and the heat exchanger on the leeward side is further reduced, and the heat exchange performance of each heat exchanger is ensured as much as possible, and a compact composite heat exchanger can be obtained.

According to a third aspect of the present invention, in the method of manufacturing a composite heat exchanger according to the second aspect, at least one of the tubes 1 and 2 and the corrugated fin 3 are joined after being joined. A compound type in which the longitudinal end of the tube is curved so as to be separated from the other tube, and then each tube end is inserted into the tube insertion hole of each header, and the inserted portion is liquid-tightly joined. This is a method for manufacturing a heat exchanger. According to the method for manufacturing a composite heat exchanger, the insertability, brazing property or solderability between the tube and the header is improved, and a composite heat exchanger that is easy to manufacture and has high reliability can be provided.

According to a fourth aspect of the present invention, in the method of manufacturing a composite heat exchanger according to the second aspect, the first tube is formed after at least the two tubes 1 and 2 and the corrugated fin 3 are joined. A composite type in which the longitudinal end of the first tube and that of the second tube 2 are curved so as to be separated from each other, and then each tube end is inserted into the tube insertion hole of each header, and the inserted portion is liquid-tightly joined. This is a method for manufacturing a heat exchanger. . According to a fifth aspect of the present invention, in the third or fourth aspect, a pair of side members 7 are joined to both sides of the composite core, and the longitudinal ends of the side members 7 are disposed at intermediate positions in the width direction. Is a method of manufacturing a composite heat exchanger in which a slit 8 is formed in advance in parallel with the longitudinal direction. According to this method, since the slit 8 is formed in the side member 7 in advance, deformation at the end of the core becomes easy.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of the combined heat exchanger of the present invention. In this combined heat exchanger, the first tube 1 and the second tube 2 which are flat with respect to the air flow 12 are located near the upstream side and the downstream side, respectively, and each of them is in a direction orthogonal to the paper surface. Many are paralleled. Both ends of the first tube 1 are curved in a direction away from the second tube 2, and both ends of the first tube 1 are inserted into the tube insertion holes of the first header 4, respectively. Are inserted into the tube insertion holes of the second header 5, and the respective insertion portions are liquid-tightly brazed and fixed. Further, a first pipe 10 and a second pipe 11 are connected to the first header 4 and the second header 5, respectively, in a liquid-tight manner.

The first tube 1 and the second tube 2 each have a common corrugated fin 3 disposed between the tubes, and the corrugated fin 3 has a wave-turning curved portion that comes into contact with the first tube 1 and the second tube 2. , The contact portion is fixed by brazing. At both ends of the corrugated fin 3, cuts 6 are formed, and the cuts 6 are formed.
Are expanded toward the first header 4 and the second header 5.
As an example, the upstream side of the airflow 12 is used as a condenser for a car air conditioner, and the downstream side is used as a heat exchanger for cooling engine cooling water.

A composite heat exchanger having such a structure can be manufactured as follows. As a first method, as shown in FIG. 3, in the process of manufacturing the corrugated fin 3, cuts 6 are formed in advance at the upstream end and the downstream end of the corrugated fin 3 in the wave traveling direction. Then, the straight first tube 1 and the second tube 2 are arranged in parallel, the corrugated fins 3 shown in FIG. 3 are arranged therebetween, and the respective contact portions are brazed to each other. Next, both ends of the first tube 1 are respectively curved. Next, both ends of the first tubes 1 are inserted into the tube insertion holes of the first header 4, and both ends of the second tubes 2 are inserted into the tube insertion holes of the second header 5. Then, the insertion portions of the first tube 1 and the second tube 2 are liquid-tight brazed and fixed to each other.

As a second method, as shown in FIG.
After cutting the corrugated fin 3 between the corrugated fin 3 and the first tube 1 and between the corrugated fin 3 and the side member 7 without making a cut in the corrugated fin 3, the cutter 9 is used at both ends of the corrugated fin 3. The middle part in the width direction is cut. Next, both ends of the first tube 1 may be formed to be curved. In this example, a slit 8 is formed in the center of the side member 7 in the width direction in advance. Also, when the first tube 1 is bent, the first header 4 may be joined to both ends of the first tube 1 in advance.
Alternatively, it may be in a state where it does not exist. When the first tube 1 and the second tube 2 are extremely close,
Since the first header 4 cannot be fixed by brazing,
In that case, the first header 4 may be joined after bending the first tube.

Next, FIG. 2 shows a second composite heat exchanger according to the present invention, in which a first tube 1 and a second tube 2 are used.
Are formed so that both end portions are curved in directions away from each other. In addition, contrary to the case of FIG. 1, the first tube 1 may be linear and only the two end portions of the second tube 2 may be curved.

[0013]

In the combined heat exchanger according to the first and second aspects of the present invention, the first tubes 1 and the second tubes 2 arranged in parallel in the flow direction of the air flow are close to each other in two rows. The corrugated fins 3 common to them are fixed in contact with each other to form a composite core. At least one end of each of the tubes is curved in a direction away from each other, and both headers 4 are formed. , 5 are separated from each other. (1) It is possible to avoid as much as possible that both headers and their vicinity are thermally affected from the heat exchanger on the high-temperature side to the heat exchanger on the low-temperature side, A compact and space-saving composite heat exchanger can be provided. (2) Further, since the headers 4 and 5 are separated from each other, the degree of freedom of attachment of the inlet / outlet pipes attached to the respective headers increases, and the degree of freedom of the layout of the piping in a narrow place increases. (3) Further, since the space between the first tube 1 and the second tube 2 is curved so as to be separated from each other at the tube ends, each tube end is connected to the header 4, 5 respectively.
Can be easily communicated with each other, the insertability of the tube and the header is improved, and the brazing or solderability of the inserted portion is improved, so that a highly reliable composite heat exchanger can be provided.

In the composite heat exchanger according to the second aspect, the cuts 6 are formed in the corrugated fins 3 at portions close to the headers 4 and 5, and the cuts 6 are curved so as to expand toward the headers 4 and 5. Since it is formed, heat transfer between the first tube 1 and the second tube 2 via the corrugated fins 3 can be effectively prevented at least at the end of the core of the composite heat exchanger. In the method for manufacturing a composite heat exchanger according to claims 3 and 4, after the tubes 1 and 2 and the corrugated fin 3 are joined, one or more of the tube ends are bent to form the corrugated fin 3. The cut 6 is formed so as to be curved so as to expand toward the headers 4 and 5. After that, each tube end is inserted into the tube insertion hole of the header, and the inserted portions are joined in a liquid-tight manner. Therefore, it is possible to provide a composite heat exchanger that is easily manufactured and has high mass productivity. Further, in the manufacturing method according to the fifth aspect, the pair of side members 7 are joined to both sides of the composite core, and the slits 8 are formed at both ends in the longitudinal direction of the side members 7. Becomes easier.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a combined heat exchanger of the present invention.

FIG. 2 is a vertical sectional view showing a main part of another example of the composite heat exchanger.

FIG. 3 is an explanatory view showing an example of a corrugated fin 3 used for manufacturing the composite heat exchanger.

FIG. 4 is an explanatory view showing another example of the method of manufacturing the composite heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st tube 2 2nd tube 3 Corrugated fin 4 1st header 5 2nd header 6 Cut 7 Side material 8 Slit 9 Cutter 10 1st pipe 11 2nd pipe 12 Air flow

Claims (5)

[Claims] 1. A flat first tube 1 and a second tube 2 are arranged in parallel in two rows on the leeward side and the leeward side of an air flow, respectively. The corrugated fins 3 are contact-fixed to form a composite core, and the ends of the first tubes 1 communicate with the first header 4, and the ends of the second tubes 2 communicate with the second header 5, The ends of the tubes on at least one of the first tube 1 and the second tube 2 are curved in a direction away from each other, and the headers 4 and 5 are separated from each other. Combined heat exchanger. 2. A first tube 1 and a second tube 2 which are flat are arranged in parallel in two rows on the leeward and leeward sides of the air flow, respectively, and a plurality of tubes are common to the tubes 1 and 2 in both rows. The corrugated fins 3 are contact-fixed to form a composite core, and the ends of the first tubes 1 communicate with the first header 4, and the ends of the second tubes 2 communicate with the second header 5, The corrugated fin 3 is formed with a cut 6 at the middle position in the width direction only in a portion close to the headers 4 and 5, and the first cutout 6 is extended in a direction in which the cut 6 expands toward the headers 4 and 5. A composite heat exchanger wherein at least one end of each of the tubes 1 and 2 is curved so that the headers 4 and 5 are separated from each other. 3. The method for manufacturing a composite heat exchanger according to claim 2, wherein at least the tubes 1 and 2 and the corrugated fin 3 are provided.
After being joined, the longitudinal end of one of the tubes is curved so as to be separated from the other tube, and then each tube end is inserted into the tube insertion hole of each header, A method for manufacturing a composite heat exchanger in which the insertion portions are joined in a liquid-tight manner. 4. The method for manufacturing a composite heat exchanger according to claim 2, wherein at least the tubes 1 and 2 and the corrugated fin 3 are provided.
After being joined, the longitudinal end of the first tube 1 and that of the second tube 2 are curved so as to be away from each other, and then each tube end is inserted into the tube insertion hole of each header, A method for manufacturing a composite heat exchanger in which the insertion portions are joined in a liquid-tight manner. 5. The composite core according to claim 3, wherein a pair of side members 7 are joined to both sides of the composite core,
A method of manufacturing a composite heat exchanger in which a slit 8 is formed in advance at both ends in the longitudinal direction of the side member 7 at an intermediate position in the width direction in parallel with the longitudinal direction.