JPH05322467A - Heat exchanger - Google Patents

Abstract

PURPOSE:To facilitate manufacture of a pipe in a heat exchanger in which a header is installed only at one side of a group of tubes by a method wherein the tubes having a going passage and a return passage therein form the going passage and the return passage by inserting inner fins shorter than the tube length into the tubes. CONSTITUTION:Refrigerant of high temperature and high pressure flows from an inlet pipe 16 into a flowing chamber 12 within a header 6 and is guided to a going passage 20 of each of tubes 2. In this case, since the refrigerant is condensed and liquified to decrease a thermal conductivity, the going passage 20 is arranged at an air feeding side so as to improve the condensing capability of a refrigerant condensor 1. The refrigerant guided to the going passage 20 is heat exchanged with air while flowing in the going passage 20, thereafter turned at a communicating part 9, guided to a return passage 21, heat exchanged again with air, collected within a flowing-out chamber 13 within the header 6 and flows out from an outlet pipe. The tube 2 forms the communicating part 9 at one end of it by inserting inner fins 7 into the tube 2 and closing one end of the tube 2 by a capsule 8 of a capsule plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger in which a header is connected to only one side of a plurality of tubes.

[0002]

2. Description of the Related Art As a conventional technique, the actual kaihei 3-5606 is used.
The technique disclosed in Japanese Patent Publication No. 1 is known. The heat exchanger disclosed in this technology has a header connected to only one side of a plurality of tubes. Inside the tube, a passage for guiding fluid to one side and a passage for guiding fluid to the other are formed. .. Then, as shown in FIG. 13, at one end of the tube 100, a communication portion 103 that connects the going passage 101 and the returning passage 102 was formed.

[0003]

Conventional tube 100
However, since the communication portion 103 that connects the going passage 101 and the returning passage 102 is provided without using any other member, it is difficult to manufacture the tube 100.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat exchanger in which a tube having a communicating portion for communicating an outgoing passage and a return passage can be easily manufactured. is there.

[0005]

The heat exchanger of the present invention employs the following two technical means. [First Invention] A heat exchanger has a plurality of communication passages each having a going passage for guiding a fluid to one side and a returning passage for guiding a fluid to the other, and a communicating portion communicating the going passage and the returning passage at one end. A tube and a header that is connected to the other ends of the plurality of tubes and has an interior that is separated into a chamber that communicates with the going passage and a chamber that communicates with the returning passage. And
The tube forms the going passage and the returning passage by inserting an inner fin bent in a wavy shape into the inside, and the communicating portion defines the length of the inner fin in the longitudinal direction as the tube. The length is shorter than the length in the longitudinal direction of the tube, a portion where the inner fin does not exist is provided at one end of the tube, and one end of the tube is covered with a capsule.

[Second Invention] A heat exchanger is internally provided with a forward passage for guiding a fluid to one side and a return passage for guiding a fluid to the other,
A plurality of tubes having a communicating portion that communicates the going passage and the return passage at one end, and a tube that is connected to the other ends of the plurality of tubes and has an interior that communicates with the going passage and the return passage. And a separate header in the chamber. The tube forms the going passage and the returning passage by extrusion molding, and the communicating portion is provided with a groove or hole cutting portion at one end of the tube to form the going passage and the returning passage. And the one end of the tube is covered with a capsule.

[0007]

According to the first aspect of the present invention, by inserting the inner fin shorter than the tube length into the tube, the passage and the return passage are formed in the tube, and the inner fin is not present at one end of the tube provided with the communicating portion. Places are provided. Then, by covering one end of the tube with a capsule, one end of the tube is closed and a tube having a communication portion is formed. At the location where the inner fin does not exist at one end of the tube, the going passage and the returning passage communicate with each other, so that the fluid flowing from the going passage is turned at this communicating portion and guided to the returning passage.

[0008]

As described above, in the heat exchanger of the first aspect of the present invention, a short inner fin is inserted into the tube and one end of the tube is closed with a capsule to form a communicating portion at one end of the tube. Therefore, compared to the conventional,
It is possible to easily manufacture a tube having a communication part. Thereby, the manufacturing cost of the tube can be reduced, and as a result, the manufacturing cost of the heat exchanger can be reduced.

[0009]

The operation of the second aspect of the invention makes it possible to easily form the passage and the return passage in the tube by extruding the tube. Then, by forming a groove or hole cutting portion at one end of the tube to form a communicating portion of the going passage and the returning passage, and covering one end of the tube with a capsule, one end of the tube is closed and a communicating portion is provided. The formed tube is formed. Since the cutting portion at one end of the tube connects the going passage and the returning passage, the fluid flowing from the going passage is turned at this communicating portion and guided to the returning passage.

[0010]

In the heat exchanger of the second invention, as described above, the tube is formed by extrusion molding, a groove or hole is provided at one end, and one end of the tube is closed with a capsule. Since the communication portion is formed at one end of the tube, the tube having the communication portion can be easily manufactured as compared with the conventional case. Thereby, the manufacturing cost of the tube can be reduced, and as a result, the manufacturing cost of the heat exchanger can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a heat exchanger of the present invention will be described with reference to the drawings based on an embodiment in which it is used as a refrigerant condenser. [Structure of Embodiment] FIGS. 1 to 8 show a first embodiment to which the first invention is applied, and FIG. 2 shows a front view of a refrigerant condenser. The refrigerant condenser 1 is incorporated in, for example, an air conditioner of an automobile, and a plurality of flat tubes 2 and corrugated fins 3 are alternately laminated, and side surfaces are provided on both outer sides (vertical direction in FIG. 2) in the laminating direction. It is composed of a core part on which the plate 4 is arranged, a capsule plate 5 joined to one end of the plurality of tubes 2, and a header 6 joined to the other end of the plurality of tubes 2, which are integrally brazed in a furnace. ing.

The tube 2 is made of aluminum and is provided with an oval shape having a flat cross section as shown in FIG. 3, and an inner fin 7 made of aluminum is inserted therein. The inner fin 7 is joined to the tube 2 when integrally brazing. The inner fin 7 is formed by corrugating a plurality of thin plates so that peaks and valleys are repeated in a direction perpendicular to the longitudinal direction of the tube 2, and the inner fin 7 divides the inner fin 7 into a plurality of sections.
A plurality of passages through which the refrigerant passes are formed in the tube 2. The length of the inner fin 7 in the longitudinal direction is equal to that of the tube 2
Is slightly shorter than the length in the longitudinal direction. As a result, a portion where the inner fin 7 does not exist is provided at one end of the tube 2 (see A in FIG. 1).

As shown in FIG. 1, FIG. 4, FIG. 5 and FIG. 6, the capsule plate 5 is made of aluminum formed by pressing a plurality of capsules 8 covering one end of each tube 2 (the side where the inner fins 7 are not present). Each capsule 8 is joined to one end of each tube 2 at the time of integral brazing with a plate made of aluminum. And the capsule plate 5
Each capsule 8 covers one end of the tube 2 on the side where the inner fin 7 does not exist, so that the communication portion 9 where the refrigerant turns is formed in the tube 2 where the inner fin 7 does not exist. The length B (see FIG. 4) that the capsule 8 covers one end of the tube 2 is different from the length A (see FIG. 1) in which the inner fins 7 are not present in the tube 2.
It is the same or long. The tube 2 where the inner fins 7 do not exist becomes weak in strength because there is no inner column formed by the inner fins 7. However, according to the present embodiment, the capsule 2 completely covers the tube 2 where the inner fin 7 does not exist, so that the capsule 8 reinforces the portion having no inner column. As a result, even if the high-pressure refrigerant is supplied into the tube 2, the tube 2 withstands sufficiently even in a portion where the inner fin 7 does not exist.

The header 6 is a separate type provided by joining a plurality of aluminum members, and as shown in FIGS. 1 and 7, the cross section into which the side plate 4 and the plurality of tubes 2 are inserted is substantially C-shaped. Inner plate 10 of a mold, an outer plate 11 having a substantially C-shaped cross section which is joined to the inner plate 10 and has a cylindrical shape, and a comb-shaped separator 14 which partitions the inside of the header 6 into an inflow chamber 12 and an outflow chamber 13.
And both ends are closed by the lid 15 (see FIG. 2). Further, the outer plate 11 has an inlet pipe 16 connected to a pipe for guiding the refrigerant to the inflow chamber 12, and an outlet pipe 1 connected to a pipe for guiding the refrigerant in the outflow chamber 13 to the outside.
7 and 7 are joined by brazing (see FIG. 2).
In addition, each of the recesses 18 provided in the separator 14 (see FIG.
), And fitted with the other end of the tube 2. In addition, as shown in FIG. 7, the procedure for assembling the header 6 is such that the ends of the tubes 2 of the stacked tubes 2 and corrugated fins 3 are attached to the tube insertion holes 1 of the inner plate 10.
Plug in 9. Next, the recesses 18 of the separator 14 are fitted to the ends of the tubes 2. Then, the outer plate 11 is assembled to the inner plate 10, and the assembly of the tubular portion of the header 6 is completed. After that, the lids 15 are attached to both ends of the tubular portion, and the inlet pipe 1 is attached to the outer plate 11.
By assembling the 6 and the outlet pipe 17, the assembling of the header 6 is completed.

As described above, the tube 2 has a plurality of passages formed by partitioning the inside by the inner fins 7 and has a communicating portion 9 at one end. And the other end of the tube 2 is, as shown in FIG.
The header 6 has openings in the inflow chamber 12 and the outflow chamber 13. For this reason, among the plurality of passages, the passage communicating with the inflow chamber 12 allows the refrigerant to flow to one side of the tube 2.
0, and the passage communicating with the outflow chamber 13 becomes the return passage 21 through which the refrigerant flows to the other side of the tube 2.

[Operation of Embodiment] Next, the flow of the refrigerant flowing through the refrigerant condenser 1 will be described. The high-temperature, high-pressure refrigerant discharged from the refrigerant compressor (not shown) flows from the inlet pipe 16 into the inflow chamber 12 in the header 6 and is guided from the inflow chamber 12 to the outflow passage 20 of each tube 2. Here, since the heat transfer coefficient decreases when the refrigerant condenses and liquefies, in this embodiment, as shown in FIG. 8, the outflow passage 20 is arranged on the inflow side of the air, and the condensing capacity of the refrigerant condenser 1 is reduced. We are trying to improve.
The refrigerant guided to the going passage 20 exchanges heat with air when flowing through the going passage 20, flows through the going passage 20, and then turns at the communication portion 9 to be guided to the returning passage 21 and flows through the returning passage 21. At that time, heat is exchanged with air again. The refrigerant flowing through the return passage 21 is collected in the outflow chamber 13 in the header 6 and flows out from the outlet pipe 17.

[Effect of Embodiment] Refrigerant condenser 1 of this embodiment
In the tube 2 used for, the short inner fin 7 is inserted into the tube 2, and one end of the tube 2 is closed by the capsule 8 of the capsule plate 5 to form a communication portion 9 at one end of the tube 2. Therefore, the tube 2 including the communication portion 9 can be manufactured more easily than in the conventional case. Thereby, the manufacturing cost of the tube 2 can be reduced,
As a result, the manufacturing cost of the refrigerant condenser 1 can be reduced. Moreover, since the refrigerant condenser 1 has only one header 6,
Refrigerant condenser 1 compared to two types of conventional header
The ratio of the effective heat exchange area by the tube 2 and the corrugated fins 3 in the total area of the front surface of the is large. For this reason,
The condensing capacity of the refrigerant condenser 1 can be increased as compared with the two header type.

[Second Embodiment] FIGS. 9 and 10 show a second embodiment to which the second invention is applied, and FIG. 9 is a cross-sectional view of essential parts of the refrigerant condenser 1. The tube 2 of the present embodiment is extruded so that a plurality of passages are formed therein, and among the plurality of passages, the passage communicating with the inflow chamber 12 becomes the outflow passage 20 and the outflow chamber 13. The passage that communicates is the return passage 21. Then, as shown in FIG. 10, one end of the tube 2 has a U-shaped groove (cutting portion) across each passage.
22 is provided by cutting, and a portion having no inner column is formed at the end of the tube 2. Then, the capsule 8 of the capsule plate 5 covers the end of the tube 2 and the end of the groove 22, so that the inside of the groove 22 serves as the communication portion 9. In this embodiment, a plurality of passages are provided in the tube 2 by extrusion molding the tube 2, a groove 22 is provided at one end of the tube 2, and one end of the tube 2 is closed by a capsule 8 to connect the communication portion 9 to the one end of the tube 2. Is formed. Therefore, the tube 2 including the communication portion 9 can be manufactured more easily than in the conventional case. Thereby, the manufacturing cost of the tube 2 can be reduced, and as a result, the manufacturing cost of the refrigerant condenser 1 can be reduced.

[Third Embodiment] FIG. 11 is a third embodiment to which the second invention is applied and is a side view of the end portion of the tube 2. Like the second embodiment, the tube 2 of this embodiment has a plurality of passages formed therein by extrusion, and one end of the tube 2 is provided with a V-shaped groove (cutting portion) 22 extending over each passage.
One end of the tube 2 and the end of the groove 22 are closed with a capsule (see the second embodiment) to establish a communication portion (see the second embodiment).
Is provided.

[Fourth Embodiment] FIG. 12 is a side view of an end portion of the tube 2 according to a fourth embodiment of the present invention. Like the second and third embodiments, the tube 2 of this embodiment has a plurality of passages formed therein by extrusion, and a hole (cutting portion) 23 penetrating each passage is provided at one end of the tube 2. One end of the tube 2 and the end of the hole 23 are closed with a capsule (see the second embodiment), and a communication portion (see the second embodiment) is provided inside the hole 23.

[Modification] In the above embodiment, the capsule plate is provided separately from the side plate, but the capsule plate may be provided integrally with the side plate. As a result, the number of parts of the heat exchanger can be reduced, and the tubes and the corrugated fins can be easily and reliably held. Although an example in which each capsule is integrated by a plate is shown, a capsule that covers one end of the tube may be individually provided. The structure of the header is
Other structures may be adopted instead of the gist of the present invention. Although the example in which the heat exchanger is applied to the refrigerant condenser is shown, the present invention can be applied to various heat exchangers such as a refrigerant evaporator, a radiator, a heater core, and an oil cooler.

[Brief description of drawings]

FIG. 1 is a sectional view of a refrigerant condenser (first embodiment).

FIG. 2 is a front view of a refrigerant condenser (first embodiment).

FIG. 3 is a sectional view of a tube (first embodiment).

FIG. 4 is a side view of the capsule plate (first embodiment).

FIG. 5 is a front view of a capsule plate (first embodiment).

FIG. 6 is a sectional view of a refrigerant condenser including a capsule plate (first embodiment).

FIG. 7 is an exploded view of a header (first embodiment).

FIG. 8 is an explanatory view showing the flow of the refrigerant in the refrigerant condenser (first embodiment).

FIG. 9 is a sectional view of a refrigerant condenser (second embodiment).

FIG. 10 is a perspective view of one end of a tube (second embodiment).

FIG. 11 is a side view of the tube (third embodiment).

FIG. 12 is a side view of the tube (fourth embodiment).

FIG. 13 is a cross-sectional view of a heat exchanger (prior art).

[Explanation of symbols]

 1 Refrigerant condenser (heat exchanger) 2 Tube 6 Header 7 Inner fin 8 Capsule 9 Communication part 12 Inflow chamber 13 Outflow chamber 20 Outgoing passage 21 Return passage 22 Groove (cutting portion) 23 Hole (cutting portion)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ryoichi Sanada 1-1, Showa-cho, Kariya city, Aichi Prefecture Nihon Denso Co., Ltd. (72) Inventor Eiichi Torikoshi 1-1-cho, Showa-machi, Kariya city, Aichi prefecture Incorporated (72) Inventor Michiyasu Yamamoto 1-1-1, Showa-cho, Kariya City, Aichi Prefecture

Claims (2)

[Claims] 1. A plurality of tubes, each having a going passage for guiding a fluid to one side and a returning passage for guiding a fluid to the other, and having a communicating portion at one end for communicating the going passage and the returning passage, and a plurality of tubes. A heat exchanger provided with a header connected to the other end of the tube, the interior of which communicates with the going passage and the chamber which communicates with the return passage, wherein the tube is bent inside in a wavy shape. The inner passage is formed by inserting an inner fin, and the communicating passage is provided with the return passage, and the communicating portion is provided with a length in the longitudinal direction of the inner fin shorter than a length in the longitudinal direction of the tube. A heat exchanger, wherein a portion where the inner fin does not exist is provided at one end of the tube and the tube is provided by covering one end of the tube with a capsule. 2. A plurality of tubes, each having a going passage for guiding a fluid to one side and a returning passage for guiding a fluid to the other, and having a communicating portion at one end for communicating the going passage and the returning passage, and a plurality of tubes. A heat exchanger provided with a chamber that is connected to the other end of the tube, the inside of which communicates with the outgoing passage, and the header that is separated into a chamber that communicates with the return passage. And the return passage, the communicating portion is provided with a groove or hole cutting portion at one end of the tube to communicate the going passage and the return passage, and one end of the tube is covered with a capsule. A heat exchanger characterized by being provided by.