JP2000230795A - Fin-type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and efficiently perform the same heat exchange as the division of a fin without increasing the number of times for inserting the fin by forming a plurality of slits in the fin, and by suppressing heat conduction in the fin. SOLUTION: In a heat exchanger 10, a flat fin 13 made of aluminum or the like is inserted into a plurality of heat transfer pipes 12 consisting of a copper pipe or the like, and a fin 11 is provided at the left and right ends. In the fin, a plurality of rectangular slits 14 are provided with each of the heat transfer pipes 12 as a center. The formation positions of the slits 14 are set to the middle position of the adjacent heat transfer pipes 12, and a long side orthogonally crosses an adjacent direction formed by the adjacent heat transfer pipes 12. The slits 14 are provided at the middle position of the heat transfer pipes 12 that form the shortest distance out of distance formed by each of the heat transfer pipes 12, and heat conduction in the fin 11 can be suppressed by the required minimum slit formation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin type heat exchanger in which heat exchange efficiency is improved by forming slits in fins.

[0002]

2. Description of the Related Art At present, refrigeration systems are used for various products such as showcases, and are equipped with a compressor for compressing refrigerant, a condenser for condensing refrigerant, a capillary tube for depressurizing the refrigerant, and the like, and a refrigerant for evaporating refrigerant. The evaporator and the like are the main components.

[0003] Since the condenser and the evaporator have substantially the same configuration, they are collectively referred to as a heat exchanger in the following description unless otherwise specified.

FIG. 6 is a schematic diagram showing a schematic configuration of the heat exchanger 100. A large number of fins 120 are inserted into a heat transfer tube 110 at a predetermined interval, and air such as outside air or air in a refrigerator is blown by a blower (not shown). Is done.

When such a refrigerating apparatus is used in a showcase, the refrigerant that has been compressed by the compressor and has become a high-temperature and high-pressure gas exchanges heat with the outside air in a condenser to release heat to the outside air and condense. Then, the pressure is reduced by the pressure reducing device and supplied to the evaporator.

[0006] In this evaporator, the refrigerant exchanges heat with the internal air or the like, is heated by the internal air or the like, evaporates, and returns to the compressor.

In such a refrigeration system, it is important to increase the heat exchange efficiency between the refrigerant and the outside air or the air in the refrigerator, in order to improve the refrigeration efficiency of the refrigeration system. An independent configuration has been proposed to prevent the 120 from straddling.

FIG. 7 is a diagram showing such a heat exchanger 101. With this configuration, even if the fins 121 on the windward side are heated by air, the fins 121 on the leeward side are not affected by the heating or the like. Therefore, efficient heat exchange is possible.

[0009]

However, when the fins 121 are made independent as described above, there is a problem that the number of work steps in assembling the heat exchanger 101 increases.

That is, the heat exchanger 101 is assembled by the heat transfer tube 1
This is performed by inserting fins 121 into 10,
When the fins 121 are divided independently as described above, the number of insertions of the fins 121 increases, and the cost increases.

Accordingly, the present invention provides a fin type heat exchanger capable of performing inexpensive and highly efficient heat exchange by obtaining the same effect as dividing a fin without increasing the number of fin insertions. The purpose is to provide.

[0012]

Means for Solving the Problems To solve the above problems, the invention according to claim 1 is characterized in that a plurality of fins are inserted at a predetermined interval into a plurality of heat transfer tubes through which a refrigerant circulates, and the fins are arranged in a line. A support for supporting the heat transfer tubes is provided at both end sides of the fins. The fins are formed to suppress heat conduction in the fins, so that high-efficiency heat exchange can be performed as in the case of dividing the fins without increasing the number of insertions of the fins.

According to a second aspect of the present invention, the slit is provided at an intermediate position between the adjacent heat transfer tubes to effectively suppress heat conduction in the fin, thereby increasing the number of fin insertions. It is characterized in that highly efficient heat exchange can be performed as in the case where the fins are divided.

According to a third aspect of the present invention, the slit is provided at an intermediate position between the heat transfer tubes which is the shortest heat transfer tube adjacent distance among the heat transfer tube adjacent distances between adjacent heat transfer tubes,
It is characterized in that heat conduction in the fins is suppressed by forming the minimum required slits, thereby enabling highly efficient heat exchange as if the fins were split without increasing the number of insertions of the fins .

According to a fourth aspect of the present invention, the slit is formed in a rectangular shape, and its long side is provided orthogonal to the adjacent direction formed by the adjacent heat transfer tube to suppress heat conduction in the fin. Thus, heat exchange can be performed with high efficiency as in the case of dividing the fins without increasing the number of fin insertions.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cutaway perspective view of a heat exchanger 10 according to the present invention.

In the heat exchanger 10, flat fins 11 made of aluminum or the like are inserted into a plurality of heat transfer tubes 12 made of a copper tube or the like, and supports 13 are provided at the left and right ends thereof.

The fin 11 is provided with a plurality of slits 14 centered on each heat transfer tube 12, and the slit 14 is formed at an intermediate position between the adjacent heat transfer tubes 12, and adjacent to the heat transfer tube 12 having a long side adjacent thereto. It is provided orthogonal to the direction.
In the configuration shown in FIG. 1, the slit 14 is formed so as to be located on a side of a regular hexagon.

It should be noted that the short side dimension of the slit 14 may be as small as 1 mm, for example, as long as heat diffusion can be suppressed, as will be apparent from the reason described later.

The reason why the slit 14 is formed will be described with reference to FIG. The description will be made on the assumption that the heat exchanger 10 acts as an evaporator to cool the air.

FIG. 2A is a partial plan view of the fin 11 when the slit 14 is not provided, and it is assumed that a heat source comes into contact with a point Q in the figure. 2 (b) to 2 (d) show that the distance D between the heat transfer tubes 12 is D1, D2, D3 (D1 <D2 <D
FIG. 4 is a diagram schematically illustrating a temperature distribution on an AA line before (solid line) and after (dotted line) contact of a heat source when the temperature is changed to 3). TR indicates room temperature, and TD indicates the surface temperature of the heat transfer tube 12.

As can be seen from these figures, the heat transfer tubes 12
Is smaller than room temperature, the maximum temperature of the fins 11 approaches room temperature as the distance between the heat transfer tubes 12 increases, and the maximum temperature becomes room temperature when the distance exceeds a certain distance. P increases.

When the heat source is brought into contact with the fins 11 having such a temperature distribution, the influence of the heat source on the periphery of the adjacent heat transfer tube 12 is obtained when the space between the heat transfer tubes 12 is narrow as shown in FIG. Appears greatly, while the heat transfer tube 1 as shown in FIG.
When the interval between the two is large, the influence of the heat source on the surroundings of the adjacent heat transfer tubes 12 becomes small.

The fact that the influence of the heat source also appears around the adjacent heat transfer tube 12 means that even if the refrigerant flowing in the heat transfer tube 12 close to the heat source has the ability to absorb the rise in temperature caused by this heat source, It means that the cooling capacity cannot be sufficiently exhibited due to the high diffusion rate.

Generally, the amount of heat transfer between materials having different temperatures is
It is approximately proportional to the temperature difference. Therefore, conventionally, the fins 11 are divided into strips to confine the heat (to restrict the heat diffusion),
Thereby, the refrigerating capacity of the refrigerant is efficiently exhibited by increasing the temperature gradient in the strip-shaped fins 11.

However, as described above, the division of the fin 11 into strips in this manner increases the number of assembling steps and the like and causes a cost increase, as described above.

Therefore, in the present invention, the heat diffusion is suppressed by providing the slit 14, thereby increasing the temperature gradient of the fin 11 in the peripheral portion of the heat transfer tube 12.

In the configuration shown in FIG. 1, since the heat transfer tubes 12 are disposed so as to be located at the vertices of an equilateral triangle,
Although the slit 14 is formed so as to be located on the side of the regular hexagon, it is clear from the above description that the present invention is not limited to such a configuration.

That is, when the heat transfer tubes 12 are provided at the apexes of an isosceles triangle as shown in FIG. 3, the slits 14 can be provided only between the adjacent heat transfer tubes 12.

When the heat transfer tube 12 is provided so as to be located at the apex of a square as shown in FIG. 3, a slit 14 can be provided on a rectangular side. In this case, it is preferable to remove (perforate) the region K because a large heat conduction occurs in the region K and the temperature gradient is reduced.

Further, in the case where the heat transfer tube 12 is disposed at a position where the geometrical shape is not clear as described above, as shown in FIG. It is also possible to provide a slit 14.

[0032]

As described above, according to the first aspect of the present invention, since a plurality of slits are formed in the fin,
It is possible to suppress heat conduction in the fins, thereby enabling highly efficient heat exchange as in the case of dividing the fins without increasing the number of fin insertions.

According to the second aspect of the present invention, since the slit is provided at an intermediate position between the adjacent heat transfer tubes, heat conduction in the fin is effectively suppressed, thereby increasing the number of insertions of the fin. As a result, heat can be exchanged with high efficiency as in the case where the fin is divided.

According to the third aspect of the present invention, the slit is provided at an intermediate position of the heat transfer tube which is the shortest heat transfer tube adjacent distance among the heat transfer tube adjacent distances of the adjacent heat transfer tubes. The formation of the slits suppresses heat conduction in the fins, thereby enabling high-efficiency heat exchange as in the case of dividing the fins without increasing the number of fin insertions.

According to the fourth aspect of the present invention, since the slit is formed in a rectangular shape and the long side is provided orthogonal to the adjacent direction formed by the adjacent heat transfer tube, the heat conduction in the fin is prevented. Thus, heat exchange can be performed with high efficiency as in the case where the fin is divided without increasing the number of fin insertions.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a heat exchanger applied to the description of an embodiment of the present invention.

FIG. 2 is a diagram for explaining an effect of providing a slit.

FIG. 3 is a diagram illustrating a formation position of a slit when a heat transfer tube is provided at a vertex position of an isosceles triangle.

FIG. 4 is a diagram illustrating a formation position of a slit when a heat transfer tube is provided at a vertex position of a square.

FIG. 5 is a diagram illustrating a formation position of a slit when a heat transfer tube is provided at an irregular position.

FIG. 6 is a schematic diagram of a heat exchanger applied to the description of the related art.

FIG. 7 is a schematic diagram of a heat exchanger applied to the description of the related art.

[Explanation of symbols]

 Reference Signs List 10 heat exchanger 11 fin 12 heat transfer tube 13 support 14 slit

Claims (4)

[Claims] A plurality of fins are inserted at predetermined intervals into a plurality of heat transfer tubes through which a refrigerant circulates, and a support for supporting the heat transfer tubes is provided at both end sides of the fins arranged in a line. A fin-type heat exchanger for exchanging heat between air flowing along a plate surface of a fin and a refrigerant flowing in the heat transfer tube, wherein a plurality of slits are formed in the fin. . 2. The fin type heat exchanger according to claim 1, wherein the slit is provided at an intermediate position between the adjacent heat transfer tubes. 3. The heat transfer tube according to claim 1, wherein the slit is provided at an intermediate position of the heat transfer tube which is the shortest heat transfer tube adjacent distance among the heat transfer tube adjacent distances of the adjacent heat transfer tubes. Fin type heat exchanger. 4. The slit according to claim 1, wherein the slit is formed in a rectangular shape, and a long side thereof is provided orthogonal to an adjacent direction formed by the adjacent heat transfer tubes.
A fin-type heat exchanger according to any one of the preceding claims.