JPH10220920A - Heat exchanger for heating refrigerant and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a small, efficient and low cost heat exchanger for heating a refrigerant by winding a pipe body with non-circular cross section for the circulation of refrigerant on the cylinder body formed with fins on the inside surface of it contacting at the circumferential position of the pipe body where the contacting area is maximized. SOLUTION: Combustion gas is flowed in the direction of an arrow X inside a cylinder body 5 formed with fins 6 on the inside surface of it and a pipe body 7 is wound on the outer surface part of the cylinder body 5. The pipe body 7 is formed with a non-circular cross section and the pipe body 7 contacts the cylinder body 5 at the circumferential position of the pipe body 7 where the contacting area is maximized. The shape of the cross section of the pipe body 7 wound on the cylinder body 5 is, for example, semicircle. Therefore, contacting area between the cylinder body and the pipe body is increased so that efficient heat exchange can be performed and without the necessity of the connection of the pipe body with repeated U bending, the size of the heat exchanger is reduced. The cost of it is reduced by the use of the low cost pipe body with a circular cross section deforming it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for heating a refrigerant for exchanging heat with a combustion gas to heat the refrigerant, and a method for manufacturing the same.

[0002]

2. Description of the Related Art An example of a conventional heat exchanger for heating a refrigerant will be described below with reference to the drawings. FIG. 4 is a perspective view showing a main portion of a conventional heat exchanger for heating a refrigerant, and FIG.
Has a tubular body, forms a combustion chamber, supports a tube 2 for refrigerant flow, and further has a fin (not shown) for facilitating the transfer of heat to the tube 2 inside thereof. The pipe 2 through which the refrigerant flows is disposed in the direction of the combustion gas flow on the surface of the tubular body 1 while repeating a U-shaped bend in order to optimize the overall shape. The body 2 is deformed in order to improve mutual heat conduction to improve its contact. 3 is a burner, 4 is an air introduction pipe. In such a configuration, the burner 3
Is burned, the heat of the generated combustion gas is transmitted to the tube 2 through the fins of the tubular body 1, and the refrigerant flowing therein is heated to perform heat exchange.

[0003]

However, in such a conventional heat exchanger for heating a refrigerant, it is necessary to optimize the overall shape.
Refrigerant circulating inside it alternately passes through the upstream and downstream sides of the combustion gas, resulting in a poor heat exchange rate, and deformation processing to improve heat conduction between the tubular body and the tubular body. In addition, there are many problems such as the need for processing man-hours, and the necessity of the U-shaped bending which has no effect on heat absorption.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a small, efficient, and low-cost heat exchanger for heating a refrigerant and a method for manufacturing the same.

[0005]

In the heat exchanger for heating a refrigerant according to the present invention, a tube for flowing a refrigerant having a non-circular cross-sectional shape is brought into contact with an outer peripheral portion of a cylindrical body having a fin formed on an inner surface thereof. The tube is wound so as to be in contact at a peripheral surface position where the area is large, and as a manufacturing method, the tube is wound around the outer peripheral portion of the cylindrical body while being formed into a non-circular cross-sectional shape. It is.

According to the present invention, it is possible to obtain a small, efficient, and low-cost heat exchanger for heating a refrigerant and a method of manufacturing the same.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a perspective view showing a main part of a heat exchanger for heating a refrigerant according to Embodiment 1 of the present invention. In the drawing, reference numeral 5 denotes a cylindrical body having fins 6 therein, through which combustion gas flows in the direction of arrow X. 7 is this cylinder 5
Is formed in a non-circular cross-sectional shape in advance. In such a configuration, the cylindrical body 5 and the tubular body 7 are brought into contact with each other at the peripheral surface position of the tubular body 7 where the contact area with the tubular body 5 becomes large, as compared with the conventional one.
The contact area increases, efficient heat exchange can be performed, and downsizing can be achieved without the need for a pipe connection that repeats U-shaped bending.

Next, the following embodiment will be described as a more specific example of this tube. FIG. 2 is a sectional view taken along the line AA-A of FIG. 1 showing the configuration of each example of the tube in the first embodiment of the refrigerant heating heat exchanger of the present invention.

(Embodiment 1) FIG. 2 (a) is a sectional view taken along the line AA of FIG. 1 showing a configuration of a tube body in the present embodiment, and a sectional shape of a tube body 7 wound around a cylindrical body 5. Is made semicircular.

In this case, the contact area between the tubular body and the tubular body is increased, efficient heat exchange can be performed, and the inexpensive circular tubular body can be deformed and used. Cost reduction can be achieved.

(Embodiment 2) FIG. 2 (b) is a cross-sectional view taken along the line AA of FIG. 1 showing the structure of a tube in the present embodiment, and the cross-sectional shape of a tube 7 wound around a tube 5. Into a triangle.

[0013] In this case, the contact area between the cylindrical body and the tubular body is increased, and efficient heat exchange can be performed. Further, since the refrigerant is agitated because of its triangular shape, the heat exchange efficiency is further improved.

(Embodiment 3) FIG. 2 (c) is a cross-sectional view taken along the line AA of FIG. 1 showing the structure of a tube in this embodiment, and is a cross-sectional shape of a tube 7 wound around a tube 5. Is a square.

In this case, the contact area between the cylinder and the tube increases, and efficient heat exchange can be performed. In addition, since the inner area of the tube increases, the flow resistance of the refrigerant decreases,
Even an inexpensive pump can easily flow the refrigerant.

(Embodiment 2) FIG. 3 is a perspective view showing a main part of a second embodiment of an apparatus capable of implementing a method for manufacturing a heat exchanger for heating a refrigerant according to the present invention. In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals.
In the figure, 5 is a cylindrical body having fins 6 inside, 7 is a tube wound around the outer periphery of the cylindrical body 5, and 8 is a die for forming the tube 7 into a desired sectional shape. Here, for example, the cylindrical body 5 is rotated in the direction of the arrow Y, and the cylindrical body 7 is formed into a desired cross-sectional shape, for example, a non-circular shape through the die 8, and the cylindrical body 5 is formed at a peripheral position where the contact area becomes large. By winding around the outer peripheral portion, the contact area between the tubular body 5 and the tubular body 7 is increased, and at the same time, the manufacturing work efficiency can be improved. In addition, as another example of the cross-sectional shape of the tubular body 7, the shapes shown in FIGS. 2A, 2B, and 2C can be cited.

[0017]

As described above, according to the present invention, a coolant circulation tube having a non-circular cross-sectional shape is provided on the outer peripheral portion of a cylindrical body having a fin formed on the inner surface, and has a large contact area. By being wound so as to be in contact at a certain peripheral position, an advantageous effect is obtained in that the size and efficiency of the heat exchanger for heating the refrigerant can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a main part of a heat exchanger for heating a refrigerant according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 showing a configuration of each example of the pipe body in the first embodiment of the refrigerant heating heat exchanger of the present invention.

FIG. 3 is a perspective view showing a configuration of a main part of a second embodiment of an apparatus capable of performing a method of manufacturing a heat exchanger for heating a refrigerant according to the present invention.

FIG. 4 is a perspective view showing a configuration of a main part of a conventional heat exchanger for heating a refrigerant.

[Explanation of symbols]

 5 ... cylindrical body, 6 ... fin, 7 ... tubular body, 8 ... die.

 ──────────────────────────────────────────────────の Continued on the front page (72) Koji Kurisutani, Inventor 1006 Kazuma Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd. (72) Inventor Nobuki Shima 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (8)

[Claims] 1. A refrigerant circulation tube having a non-circular cross-sectional shape is wound around an outer peripheral portion of a cylindrical body having a fin formed on an inner surface so as to come into contact with a peripheral surface position at which the contact area becomes large. A heat exchanger for heating refrigerant. 2. The heat exchanger for heating a refrigerant according to claim 1, wherein the non-circular cross-sectional shape is a semicircle. 3. The heat exchanger for heating a refrigerant according to claim 1, wherein the non-circular cross-sectional shape is a triangle. 4. The heat exchanger for heating a refrigerant according to claim 1, wherein the non-circular cross-sectional shape is a square. 5. A winding body which is formed into a non-circular cross-sectional shape so as to contact a tube for refrigerant flow with an outer peripheral portion of a cylindrical body having a fin formed on an inner surface at a peripheral surface position where a contact area thereof is increased. A method for manufacturing a heat exchanger for heating a refrigerant. 6. The method for manufacturing a heat exchanger for heating a refrigerant according to claim 5, wherein the non-circular cross-sectional shape is a semicircle. 7. The method for manufacturing a heat exchanger for heating a refrigerant according to claim 5, wherein the non-circular cross-sectional shape is a triangle. 8. The method for manufacturing a heat exchanger for heating a refrigerant according to claim 5, wherein the non-circular cross-sectional shape is a square.