JP2000234823A - Fin type heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the heat exchanging efficiency of a heat exchanger without increasing an air resistance, by a method wherein a plurality of rows of heat transfer tubes are arrayed in parallel in the flowing direction of air and a direction orthogonal to the flow direction of air to constitute the two-dimensional arrangement of the heat transfer tubes, while the density of rows of fins are changed in respective directions. SOLUTION: A heat exchanger 10 is constituted of the main components of a heat exchanger main body 20 and a fan 30. A dotted line, shown in a diagram, is the inscribed circle 33 of blades 31 in the fan 30 and a boss 32 is positioned at the central part of the circle. The heat exchanger main body 20 is constituted of a plurality of heat transfer tubes 22 made by a steel tube or the like, a plurality of flat plate type fins 21 made of aluminum or the like and penetrated by the tubes 22, and supporting bodies 23 provided at left and right ends of the pipes. In this case, respective heat transfer tubes 22 are connected by a U-tube 24. On the other hand, the heat exchanger main body 20 is constituted of a plurality of layers arrayed in the vertical direction and are laminated. According to this method, the heat exchanging efficiency of the heat exchanger 10 can be improved without increasing the air resistance of the heat exchanger 10.

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 while preventing a decrease in air volume.

[0002]

2. Description of the Related Art At present, refrigeration systems are used for various products such as showcases, and mainly include a compressor for compressing refrigerant, a condenser for condensing refrigerant, a decompressor for depressurizing refrigerant, and an evaporator for evaporating refrigerant. It has a configuration.

[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. 5 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 predetermined intervals, and air such as outside air or air in a refrigerator is blown by a blower 130. ing.

When such a refrigerating apparatus is used in a showcase, the refrigerant which has been compressed by the compressor to become a high-temperature and high-pressure gas radiates heat to the outside air by exchanging heat with the outside air in a condenser. To be condensed, reduced in pressure by a pressure reducer, and supplied to an 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 refrigerating apparatus, it is important to improve the heat exchange efficiency between the refrigerant and the outside air or the air in the refrigerator in order to improve the refrigerating efficiency of the refrigerating apparatus. That is being done.

[0008]

However, in order to increase the heat exchange efficiency in the heat exchanger 100, the fins 12
When the array density of 0s is increased, the air resistance increases accordingly, so that a sufficient amount of air cannot be exchanged, and it has been difficult to effectively improve the heat exchange efficiency.

Of course, it is possible to increase the size of the blower 130 so that a sufficient amount of air exchanges heat. However, even if the heat exchange efficiency is improved, a large amount of power is consumed by the blower 130. In some cases, the refrigeration efficiency is reduced.

Accordingly, an object of the present invention is to provide a fin-type heat exchanger having improved heat exchange efficiency without increasing the air resistance of the heat exchanger.

[0011]

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 fin-type heat exchanger in which a support for supporting the heat transfer tube is provided at both ends of the fin type heat exchanger for exchanging heat between air flowing by the blower along the plate surface of the fins and refrigerant flowing in the heat transfer tube. A plurality of heat transfer tubes are arranged in the direction of air flow and in a direction perpendicular to this direction to form a two-dimensional arrangement of the heat transfer tubes, and the fin arrangement density is changed in each direction to achieve heat exchange. The heat exchange efficiency is improved without increasing the air resistance of the vessel.

According to a second aspect of the present invention, the arrangement density of the fins inserted in the heat transfer tubes arranged in a plane perpendicular to the flow direction of the air is smaller on the windward surface. It is characterized by the following.

According to a third aspect of the present invention, the arrangement density of the fins located in the outer region of the inscribed circle of the blade in the fan is smaller than the arrangement density of the fins located in the inner region of the inscribed circle of the blade. It is characterized by the following.

According to a fourth aspect of the present invention, the arrangement density of the fins located in the region of the boss of the blower is smaller than the arrangement density of the fins located in the region inside the inscribed circle of the blade in the blower. It is characterized by the following.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a view showing a schematic configuration of a heat exchanger 10 according to the present invention, and FIG. 2 is a view showing a heat exchanger 1 viewed from a vertical direction.
FIG. 3 is a diagram showing a configuration of a zero. As can be seen from these figures, the heat exchanger 10 has a heat exchanger main body 20 and a blower 30 as main components.

The dotted line shown in FIG. 1 is the blade inscribed circle 33 of the blade 31 in the blower 30, and the boss 32 is located at the center thereof.

The heat exchanger body 20 is formed by inserting a plurality of flat fins 21 made of aluminum or the like into a plurality of heat transfer tubes 22 made of a copper tube or the like, and providing a support body 23 at the left and right ends. I have. And each heat transfer tube 22 is a U-shaped tube 24
Are connected by

Since the heat exchanger 10 according to the present invention has a rectangular parallelepiped shape, in the following description, the direction of air flow is defined as the width direction as shown in FIG. Defined as vertical and horizontal.

Further, the heat exchanger body 20 according to the present invention
As described above, a plurality of fins 21 are inserted into the heat transfer tube 22 and a plurality of fins 21 are arranged in the vertical direction to form a layer, and a plurality of the layers are stacked in the width direction. Therefore,
In the following description, one heat transfer tube 22 in which the fins 21 are inserted is referred to as a heat exchanger element, and a portion forming a layer is referred to as a heat exchanger layer.

Therefore, the heat exchanger body 20 is constituted by a plurality of heat exchanger elements arranged in the longitudinal direction to form a heat exchanger layer, and the heat exchanger layers are arranged in a plurality of rows in the width direction. I have.

FIG. 3 is a diagram showing the configuration of the heat exchanger layer as viewed from the width direction. Note that FIG. 3 shows only 1/4 of the corner portion because the heat exchanger layer is formed symmetrically in the vertical and horizontal directions, and FIG. 3A shows the heat exchanger layer on the uppermost wind side.
(C) has shown the heat exchanger layer of the leeward side.

The arrangement density of the fins 21 inserted in the heat exchanger layer is such that the area formed by the blade inscribed circle 33 of the blade 31 and the boss 32 is large (the interval between the fins 21 is small). The other area is arranged to be small (the interval between the fins 21 is widened).

Further, the fins 2 in the heat exchange layer on the windward side are provided.
The arrangement density of the fins 2 in the leeward heat exchanger layer
1 is formed so as to be smaller than the array density.

The reason why the arrangement density of the fins 21 in the heat exchanger layer is changed as described above is as follows.

That is, the region corresponding to the inside of the blade inscribed circle 33 is a region where the air is forcibly blown, and the region corresponding to the outside of the boss 32 and the blade inscribed circle 33 is almost compulsory. No air is blown.

Therefore, by increasing the density of the fins 21 in the region corresponding to the inside of the blade inscribed circle 33, effective heat exchange becomes possible.

The reason why the arrangement density of the fins 21 constituting the leeward heat exchanger layer is made higher than the arrangement density of the fins 21 constituting the leeward heat exchange layer is that the heat resistance is prevented while the air resistance is not increased. This is to increase the exchange efficiency.

This will be described with reference to FIG. FIG.
Is a partially enlarged view of FIG. 1, and arrows in the figure show a state where the air flowing into the heat exchanger 10 branches and collects and flows out of the heat exchanger 10.

Generally, the surface of the fin 21 has minute irregularities, and the air acts as a viscous fluid. Fin 21
Has a large surface area, which is convenient for air to exchange heat through the fins 21.

However, since the air is a viscous fluid, the air is entangled with these irregularities and clinges, so that an air layer having a low flow velocity is formed on the surface of the fin 21. On the other hand, the air on the center side between the fins 21 has a high flow velocity, and as a result, a flow velocity distribution occurs.

Generally, heat conduction between substances is substantially proportional to a temperature difference. However, when an air layer having a low flow velocity is formed on the surface of the fins 21, the air layer acts as a heat insulating layer, and the air flowing between the fins 21 sufficiently transfers heat. And the heat exchange efficiency decreases.

Therefore, if the air layer sticking to the surface of the fin 21 is peeled off, low-temperature air can directly touch the surface of the fin 21 and efficient heat exchange becomes possible.

Therefore, in the present invention, the air flowing through the heat exchanger 10 is branched and collected to generate turbulence in the air flow, and the air layer having a low flow velocity formed on the surface of the fin 21 is peeled off. I have.

[0034]

As described above, according to the first aspect of the present invention, a plurality of rows of heat transfer tubes are provided in the direction in which air flows and in a direction perpendicular to this direction, and the two-dimensional arrangement of the heat transfer tubes is achieved. Since the configuration and the arrangement density of the fins are changed in each direction, the heat exchange efficiency can be improved without increasing the air resistance of the heat exchanger.

According to the second aspect of the present invention, the arrangement density of the fins inserted into the heat transfer tubes arranged in a plane perpendicular to the air flow direction is smaller on the windward side surface. Therefore, the heat exchange efficiency can be improved without increasing the air resistance of the heat exchanger.

According to the third aspect of the invention, the arrangement density of the fins located in the outer region of the inscribed circle of the blade in the blower is smaller than the arrangement density of the fins located in the inner region of the inscribed circle of the blade. As a result, efficient heat exchange becomes possible.

According to the fourth aspect of the present invention, the arrangement density of the fins located in the region of the boss of the blower is made smaller than the arrangement density of the fins located in the region inside the inscribed circle of the blade in the fan. So that efficient heat exchange is possible

[Brief description of the drawings]

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

FIG. 2 is a top view of FIG.

FIGS. 3A and 3B are partial views showing the configuration of a heat exchanger, wherein FIG. 3A shows a heat exchanger layer on the windward side, FIG. 3B shows a next heat exchanger layer,
(C) is a block diagram of the heat exchanger layer on the leeward side.

FIG. 4 is a diagram illustrating the flow of air in a heat exchanger.

FIG. 5 is a schematic diagram of a heat exchanger applied to the description of the related art.

[Description of Signs] 10 heat exchanger 20 heat exchanger body 21 fin 22 heat transfer tube 23 support 24 U-shaped tube 30 blower 31 blade 32 boss 33 blade inscribed circle

Claims (4)

[Claims] 1. A plurality of fins are inserted at predetermined intervals into a plurality of heat transfer tubes in which a refrigerant circulates, and a support member for supporting the heat transfer tubes is provided at both ends of the fins arranged in a row.
In a fin-type heat exchanger that exchanges heat between air flowing and flowing through the heat transfer tube by air blown by a blower along a plate surface of the fin, the air flowing direction and a direction perpendicular to this direction. A plurality of rows of the heat transfer tubes are provided to constitute a two-dimensional arrangement of the heat transfer tubes;
A fin-type heat exchanger wherein the fin arrangement density is changed in each direction. 2. The arrangement density of the fins inserted in the heat transfer tubes arranged in a plane perpendicular to the flow direction of air is:
2. The fin type heat exchanger according to claim 1, wherein a surface on the windward side is smaller. 3. An arrangement density of the fins located in an outer region of a blade inscribed circle in which the blades inscribe in the blower is smaller than an arrangement density of the fins located in an inner region of the blade inscribed circle. The fin heat exchanger according to claim 1 or 2, wherein 4. An arrangement density of said fins located in a region of a boss of said blower is made smaller than an arrangement density of said fins located in an inside region of a blade inscribed circle of a blade in said blower. The fin type heat exchanger according to any one of claims 1 to 3, wherein