JP2003279276A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger easily manufactured, and having high pressure-proofness. <P>SOLUTION: A first passage group 2 and a second passage group 3 are separately formed by upwardly cutting both end parts of a multiple hole pipe 1 in the different directions in a boundary of adjacent passages 1a. Both ends of the first passage group 2 are communicated with a pair of first headers 4. Both ends of the second passage group 3 are communicated with a pair of second headers 5. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger having a high pressure resistance, which is optimal as a water heater for heating water using high temperature and high pressure gas.

[0002]

2. Description of the Related Art A heat exchanger 23 for hot water supply of a refrigeration cycle using carbon dioxide as a refrigerant is known as shown in FIG. That is, the refrigerant of the CO ₂ gas 8 flows between the heat absorber 20, the compressor 19, the radiator and the expansion valve 22. The radiator is used as a heat exchanger 23 for hot water supply, a high-temperature and high-pressure refrigerant flows through the CO ₂ gas pipe 11, water 9 is supplied to the water pipe 10, and heat is exchanged between the two.

As such a hot water supply heat exchanger 23, one shown in FIG. 9 is known as an example. This hot water heat exchanger
23, a thin CO ₂ gas pipe 11 than the diameter on the outer circumference of the water pipe 10 turn tightly wound spirally, CO ₂ gas pipe 11
A high-temperature and high-pressure CO ₂ gas 8 refrigerant is circulated through the
Water 9 is introduced from one side of 10 and heat exchange is performed between the water 9 and the CO ₂ gas 8 to obtain hot water.

FIG. 10 shows another heat exchanger 23 for hot water supply.
Those shown in are known. This has a thin tube group in which a large number of thin CO ₂ gas pipes 11 are arranged side by side as shown in FIG. 11, and the thin tube group is bent in a U-shape, and each CO ₂ gas pipe 11 is bent.
A water jacket 27 is provided on the outer surface of and the meandering water flow path is formed therein. Then, the CO ₂ gas 8 is supplied to one of the headers 12 and is circulated to the other header 12 through many CO ₂ gas pipes 11. At the same time, water 9 is supplied to the water jacket 27 to exchange heat with the CO ₂ gas 8 to obtain hot water.

[0005]

The heat exchanger as shown in FIG. 9 has the drawbacks that the manufacturing thereof is troublesome and the heat exchange performance per unit volume is low. The heat exchanger for hot water supply shown in FIG. 10 has a structure in which a large number of elongated CO ₂ gas pipes 11 are closely contacted with each other, headers 12 are attached to both ends thereof, and a water jacket 27 is arranged on the outer surfaces of the CO ₂ gas pipes 11 in parallel. , Its structure is complicated, and it has a drawback that it is troublesome to manufacture. Therefore, an object of the present invention is to provide a safe heat exchanger having a simple structure, easy assembly, and high pressure resistance.

[0006]

According to the present invention as set forth in claim 1, there is provided a multi-hole pipe (1) in which a plurality of flow channels (1a) are integrally formed in parallel with each other in the longitudinal direction. And that multi-hole tube
Both ends of (1) are cut and raised in different directions at the boundaries of the adjacent flow paths (1a), and each has a plurality of flow paths (1a), a first flow path group (2) and a second flow path. Group (3) separated into the first channel group
Both ends of (2) are fluid-tightly connected to the pair of first headers (4), and both ends of the second flow path group (3) are paired with the second header.
Is in fluid-tight communication with (5), and is the first channel group (2) and the second channel group
It is a heat exchanger configured so that a fluid different from that of (3) flows.

According to a second aspect of the present invention, in the first aspect, the multi-hole pipe (1) is further provided with both ends of the multi-hole pipe (1).
It is a heat exchanger in which the headers are cut and raised in different directions at the boundaries to be separated into the third flow path group (3a) or more flow path groups, and a pair of headers is provided for each flow path group.

The present invention according to claim 3 has a multi-hole pipe (1) in which a large number of flow paths (1a) are formed integrally in parallel with each other in the longitudinal direction. A first channel having a plurality of channels (1a), each of which is cut at both ends of (1) at a boundary between adjacent channels (1a) so that respective tip portions are located at different positions. The group (2) and the second channel group (3) are separated into the first group
Both ends of the flow channel group (2) are fluid-tightly connected to the pair of first headers (4), and both ends of the second flow channel group (3) are connected to the pair of second headers (4).
The heat exchanger is fluid-tightly connected to the header (5) and configured so that different fluids flow through the first channel group (2) and the second channel group (3).

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially exploded perspective view showing a first embodiment of a heat exchanger of the present invention, and FIG. 2 is an explanatory view explaining a method for manufacturing the multi-hole tube 1. This heat exchanger is optimal for a water heater or the like and has a multi-hole pipe 1 and a pair of first header 4 and second header 5. The multi-hole tube 1 has a large number of flow channels 1a formed inside and in parallel with each other in the longitudinal direction thereof. Then, as shown in FIG. 2, the both ends of the multi-hole pipe 1 are arranged in a predetermined angle with respect to the plane of the multi-hole pipe 1 in such a manner that they are alternately arranged in opposite directions by the cutting line 7 at the boundary between the adjacent flow paths 1a. It was cut and raised.

In FIG. 1, the first flow path group 2 is divided into a first flow path group 2 cut and raised in one direction and a second flow path group 3 cut and raised in the other direction. Both ends of the are fluid-tightly connected to the pair of first headers 4. Both ends of the second flow path group 3 are fluid-tightly connected to the pair of second headers 5.
That is, holes 6 which are aligned with the outer circumference of each multi-hole pipe 1 are formed in the first header 4 and the second header 5, and the respective flow paths 1a are formed therein.
Is fitted, and the fitted portion is brazed and fixed in a liquid-tight manner. In this example, the high-temperature and high-pressure CO ₂ gas 8 flows into one of the second headers 5 and flows out to the other second header 5 via the second flow path group 3. Also, the other first
Water 9 flows in from the header 4 and flows into one of the first headers 4 via the first flow path group 2. Then, heat exchange is performed between the CO ₂ gas 8 and the water 9 flowing through the adjacent flow paths 1a,
Water flows out as warm water.

Next, FIG. 3 shows another embodiment of the multi-hole tube 1. In this example, each flow path 1a is formed in a circular shape and its outer periphery is formed in a substantially circular shape, and the boundary is formed. Cutting line 7
2, the adjacent flow channels 1a are cut and raised in directions opposite to each other with respect to the plane of the multi-hole tube 1 as in FIG. The outer circumference of the end of the flow path 1a is formed into a circular cross section, and the end is fitted into a circular hole of a header (not shown),
The fitting portion is fixed by brazing.

Next, FIG. 4 shows still another form of the multi-hole pipe 1, and in this example, a large number of flow passages 1a are integrally formed in upper and lower two rows. Then, cutting lines 7 are formed at upper and lower boundaries at both ends of the multi-hole pipe 1, cut lines are formed therein, and the upper row and the lower row are bent in opposite directions with respect to the plane of the multi-hole tube 1, respectively.
It is formed as shown in FIG. And each of the first flow path group 2 and the second flow path group
The holes 6 of the first header 4 and the second header 5 are fitted in the flow path group 3, and the fitted portions are joined in a liquid-tight manner by means such as brazing.

Next, FIG. 6 shows another form of the heat exchanger using still another multi-hole tube 1. In this example, a plurality of flow paths 1a arranged in a line are arranged at every other boundary. The first flow channel group 2 and the second flow channel group 3 are partially removed, and the openings of the first flow channel group 2 and the second flow channel group 3 are opened at different positions in the longitudinal direction of the multi-hole tube 1. In this example, the first flow path group 2 is provided on the right side of the multi-hole tube 1.
Is located on the tip side and projects from the second flow path group 3. An elongated hole 6 and a small rectangular hole 6a are formed on the outer periphery of the second header 5 so as to face each other on the diameter line of the second header 5. Then, the flow path 1a of the first flow path group 2 is inserted into the small hole 6a, and the hole 6 is fitted to the root portion of the second flow path group 3.
The small holes 6a formed in the outer periphery of the first header 4 are fitted to the open ends of the flow paths 1a of the respective first flow path groups 2, and the fitting portions are integrally brazed and fixed. is there. As an example, the high temperature and high pressure CO ₂ gas 8 is supplied to the first header 4, the water 9 is supplied to the second header 5, and heat exchange is performed between the two.

Next, FIG. 7 shows another embodiment of the heat exchanger of the present invention. In this example, the first flow path group 2 and the second flow path group 3 are provided.
And the third flow path group 3a are present, and both ends (one side omitted) of the multi-hole pipe 1 are cut and raised upward, in the middle, and downward, and a pair of the first header 4 and the second header 5 is provided for each. , Third header 5
a is communicated. Then, the first fluid, the second fluid, and the third fluid are circulated in each header to exchange heat. Each multi-hole tube 1 shown in FIGS. 1 to 7 can be formed of an aluminum extruded material.

[0015]

In the heat exchanger of the present invention, the first flow path group 2 and the second flow path group 3 are formed by cutting and raising or notching both ends of the multi-hole tube 1 formed integrally. Since they are formed and the first header 4 and the second header 5 are provided respectively,
A heat exchanger that is easy to manufacture and compact can be formed.
Further, it is possible to provide a product having high pressure resistance and good heat exchange performance.

[Brief description of drawings]

FIG. 1 is a partially exploded perspective view showing a first embodiment of a heat exchanger of the present invention.

FIG. 2 is an explanatory view showing a method of manufacturing the multi-hole tube 1 in FIG.

FIG. 3 is an explanatory view of a multi-hole tube 1 used in another heat exchanger of the present invention.

FIG. 4 is an explanatory view of still another multi-hole tube 1.

5 is an explanatory view showing a method for manufacturing the present heat exchanger using the multi-hole tube 1 in FIG.

FIG. 6 is an exploded perspective view of still another heat exchanger of the present invention.

FIG. 7 is a front view of a main part of still another heat exchanger according to the present invention.

FIG. 8 is a block diagram of a refrigeration cycle in which a hot water supply heat exchanger, which is one of the objects of the present invention, is arranged.

FIG. 9 is a schematic perspective view of a conventional hot water supply heat exchanger.

FIG. 10 is a schematic perspective view of another conventional heat exchanger for hot water supply.

11 is a schematic cross-sectional view taken along the line XX of FIG.

[Explanation of symbols]

1 Multi-hole pipe 1a Flow path 2 First flow path group 3 Second flow path group 3a Third flow path group 4 First header 5 Second header 5a Third header 6 Hole 6a Small hole 7 Cutting line 8 CO ₂ gas 9 Water 10 Water pipe 11 CO ₂ gas pipe 12 Header 19 Compressor 20 Heat absorber 21 Fan 22 Expansion valve 23 Heat exchanger for hot water supply 27 Water jacket

Claims (3)

[Claims] 1. A multi-hole pipe (1) having a large number of flow channels (1a) formed in parallel with each other in the longitudinal direction and integrally formed, and both ends of the multi-hole pipe (1) are It is cut and raised in different directions at the boundary between the adjacent flow paths (1a) and separated into a first flow path group (2) and a second flow path group (3) each having a plurality of flow paths (1a). , Both ends of the first channel group (2) are fluid-tightly connected to the pair of first headers (4), and both ends of the second channel group (3) are paired with the second header (5). A heat exchanger that is fluid-tightly connected to the first flow path group (2) and a second flow path group (3) so that different fluids flow therethrough. 2. The multi-hole pipe (1) according to claim 1, wherein both ends of the multi-hole pipe (1) are further cut and raised in different directions at a boundary of the flow passage (1a) to form a third flow passage group (3a). A heat exchanger that is divided into more flow passage groups and is provided with a pair of headers for each flow passage group. 3. A multi-hole pipe (1) having a large number of flow paths (1a) formed in parallel with each other in the longitudinal direction and formed integrally with each other, and both ends of the multi-hole pipe (1) are A first flow channel group (2) having a plurality of flow channels (1a) and a second flow channel, each of which is formed by cutting the tip of the flow channel (1a) adjacent to each other at different positions. It is separated into a channel group (3), both ends of the first channel group (2) are fluid-tightly connected to the pair of first headers (4), and both ends of the second channel group (3) are , A heat exchanger fluid-tightly connected to the pair of second headers (5) and configured so that different fluids flow through the first flow channel group (2) and the second flow channel group (3).