JPH07103678A - Air-cooled radiator for refrigerator - Google Patents

Abstract

PURPOSE:To improve moisture spreading characteristics of an air-cooled fin of an air-cooled heat exchanger and suppress dissolving of SOx, NOx in the exchanger in coolant. CONSTITUTION:An air-cooled fin 2a has an uneven slit surface 6 formed with tube holes 5 for passing heat transfer tubes in two rows and a flat surface. The flat surface has a flat face 7a around the hole 5, and a flat face 7b of a part opposed to the hole 5 of an edge disposed at an windward side of cooling air. A V-shaped cutout 8 is formed at a part of the hole 5 of the fin 2a, such a fin 2a is disposed in a sectional area of the tube through the hole 5, an introducing groove is formed by continuous cutout 8, and means for dropping coolant droplet in each groove is provided at a sprinkler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-cooling type heat dissipation device, and more particularly, to an air-cooling type heat dissipation device suitable for a refrigerator.

[0002]

2. Description of the Related Art In a conventional absorption refrigerator, for example, as shown in FIG. 4, a dilute LiBr solution is heated in a generator 24 by gas, electricity or the like and separated into high-pressure steam and a concentrated solution of LiBr. It High-pressure steam is used for condenser (heat exchange means) 2
At 6, the water is cooled and condensed into water, which flows into the low-pressure evaporator 30 and evaporates. At that time, the heat of vaporization is taken from the outside to cool the water (liquid) that circulates with a refrigerating load (not shown).

Water vapor is led from the evaporator 30 to the absorber (heat exchange means) 22. Further, the concentrated LiBr solution separated by the generator 24 is dropped into the absorber 22. LiB
The concentrated solution of r absorbs the water vapor and becomes a dilute solution, whereby the vacuum state in the absorber 22 and in the evaporator 30 communicating with the absorber 22 is maintained. This dilute solution of LiBr is introduced into the generator 24 via the pump 27. The high temperature LiBr concentrated solution introduced from the generator 24 to the absorber 22 side and the low temperature LBr solution introduced from the absorber 22 to the generator 24 side.
A heat exchanger 28 is provided between the iBr dilute solution and the iBr dilute solution so that heat is transferred from the former to the latter.

The air-cooled radiator of this refrigerator has an air-cooled type,
There are water-cooled types and the like, and the air-cooled type is superior to the water-cooled type in terms of installability, workability, convenience, etc., but has a drawback such as a decrease in heat transfer coefficient. To compensate for this, on the one hand, the device is enlarged to secure a heat exchange surface, and on the other hand, a structure for improving the heat exchange efficiency while making the device compact is studied, and cooling water is sprinkled on the air-cooled fins. It has been proposed to perform heat exchange with latent heat of vaporization.

FIG. 5 and FIG. 6 show an example of such an air-cooled radiator for a refrigerator. In FIG. 5, a liquid circulates in the plurality of heat transfer tubes 1 located in the vertical direction, and a plurality of air cooling fins 2 are fixed across the heat transfer tube 1 at intervals in the vertical direction. A slit surface is formed on the surface of No. 2 by louver processing or the like in order to improve diffusion of cooling water sprinkled from above. Originally, louvering is performed to improve heat transfer efficiency during air cooling, but as a result, it has the effect of improving wettability. Cooling water is sprayed from the upper water sprayer 3 to the air-cooling fins 2 and flows down as shown by the arrow A in FIG. Cooling air (outside air) is introduced into the space between the air-cooling fins 2 from the outside by a fan 4 as a blowing means, as shown by an arrow B in FIG. 5, that is, as shown by an arrow C in FIG. Pass through.
In the above-described configuration, the cooling air passes through the air-cooled fins 2 that have been wet by sprinkling water, so that the evaporation of the cooling water on the air-cooled fins is promoted, and the heat transferred from the heat transfer tube 1 to the air-cooled fins 2 at this time is the cooling water. It is taken away as latent heat of vaporization and heat is released from the liquid.

[0006]

SUMMARY OF THE INVENTION In the conventional air-cooling type radiator of a refrigerator, the wetting and spreading of cooling water affects the heat transfer efficiency, so that it is an object to improve the wetting and spreading characteristics. For the sprinkling of water on the air-cooled fins, a method of discharging cooling air from the windward side and a method of discharging cooling air from the leeward side can be considered. The former method of spraying water from the windward side has been done by spraying with a spray nozzle or the like. Although this spraying and spraying method contributes to improvement of wetting and spreading characteristics, on the other hand, NOx and SOx present in the air are cooling water. It easily dissolves in the spray, and as a result, the PH of the cooling water becomes low, causing corrosion of the air-cooled fins, adhesion of scales, etc., and corrosion resistance is reduced. On the other hand, in the latter case of the water spraying method from the leeward side, the diffusion of the cooling water is limited by the flow of the cooling air C as shown in the area D in FIG. 7, and sufficient wetting and spreading cannot be obtained.

It is an object of the present invention to solve the above problems and to improve the wetting and spreading characteristics of an air-cooling type radiator of a refrigerator while suppressing corrosion and improving corrosion resistance.

[0008]

The cause of the above problem is that in the case of water spraying on the windward side, NOx and SOx are easily trapped because the sprayed space is large over the entire area of the air-cooled fin layer. On the other hand, in the leeward side watering, in order to improve the wetting and spreading characteristics, the space to be watered has to be increased, and the same result as the upwind side watering is obtained. Inconveniences such as the complexity and the number of parts required can be considered. Therefore, it is considered effective to improve windward water sprinkling. However, in order to eliminate corrosion and scale damage caused by the dissolution of NOx and SOx in cooling water, it is necessary to sprinkle water by limiting the space to the extent that wetting spread is not hindered. ,for that reason,
It was found that it is effective to use conventional spray watering as dripping water again.

Further, when a slit surface is formed on the surface of the air cooling fin, when water is dripped and sprayed on the windward side of the air cooling fin,
At the dropping portion of the upper layer of the air-cooled fin, the cooling water easily spreads over the entire surface on the leeward side and the lateral direction, and the cooling water becomes a thin film. Therefore, the cooling water is easily scattered by the cooling air that is blown in the lateral direction, so that the cooling water does not spread to the lower layer of the air-cooling fins and the upper layer is not sufficiently wet and spread to the leeward side. For these reasons, in order to solve the above problems and obtain better heat transfer efficiency, it is necessary to newly form a water sprinkling passage in which each layer of the air-cooling fins is filled with cooling water, in addition to mere drop water sprinkling. I reached the conclusion.

The present invention has been made on the basis of the above-mentioned findings. Specifically, a plurality of heat transfer tubes, which are provided in the heat exchange means of a refrigerator and which circulate a liquid, are provided at predetermined intervals across the circulation direction. Air-cooling type of the refrigerator that supplies the outside air to each air-cooling fin, sprinkles cooling water along each heat-transfer tube, and dissipates the heat of liquid through each heat-transfer tube and air-cooling fin. In the heat dissipation device, a notch is provided at an edge of each air cooling fin near each heat transfer tube to form a cooling water flow path.

A slit surface may be formed on the heat exchange surface of each air-cooling fin, and a flat surface may be formed around the notch provided on the heat exchange surface.

Further, the notches of the respective air-cooling fins are provided at the windward end edge of the outside air to form cooling water flow passages in the flow direction of the respective heat transfer tubes, and are directed toward the respective cooling water flow passages. A configuration including a sprinkler for dropping cooling water may be used.

Further, each air cooling fin may be divided according to the arrangement of the heat transfer tubes in the circulation direction of the outside air, and a notch may be provided near each heat transfer tube of each air cooling fin.

[0014]

According to the present invention, the cooling water is appropriately supplied through the flow path, and the volume occupied by the cooling air is reduced in the space of each air cooling fin layer. Therefore, the NO present in the cooling air
x and SOx are less likely to be captured, the decrease in PH of the cooling water is suppressed, and the cooling water is supplied to the lower layer of each air cooling fin.

Further, according to a preferred example, since the cooling air does not spread around the notch of each air-cooling fin, scattering by the air flow is suppressed, and the lower layer of each air-cooling fin is spread over the entire heat exchange surface of the air-cooling fin. The diffusion of cooling water is accelerated.

When a cooling water flow path is provided for each heat transfer tube, cooling water is supplied to each heat transfer tube and heat exchange is performed individually.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG.

Since the present embodiment is an air-cooled radiator for use in a refrigerator, the present invention will be described in the context of a heat exchange process of cooling with cooling water. The reference numeral will be attached.

The arrangement of the heat transfer tube 1, the air-cooling fins 2, the sprinkler 3, the fan 4, the hierarchical structure of the air-cooling fins 2, their main functions and functions are the same as those of the heat dissipation device described in the prior art. Is omitted.

In the present embodiment, each air cooling fin 2a is formed with two rows of tube holes 5 through which the heat transfer tube 1 passes, as shown in FIG. As a result, in the assembly of the air cooling fins 2a, the heat transfer tubes 1 are arranged in two rows, and the heat exchange surface by the air cooling fins 2a is formed over the entire cross section thereof. On the surface of the air-cooled fin 2a, the surface shape is divided into a slit surface 6 in which irregularities are formed by louver processing or the like, and a flat flat surface 7.
Is the flat surface 7a around the tube hole 5 and the cooling air (outside air)
A flat surface 7b of a portion of the edge portion located on the windward side of the c facing the tube hole 5 is formed. Flat surface 7b
Is one of the features of this embodiment, and its details will be described later together with other features.

Another feature of this embodiment is that a V-shaped notch 8 is formed in the flat surface 7b of the edge of each air-cooled fin 2a. When this air cooling fin 2a is assembled, on the windward side surface of the hierarchy of the air cooling fin 2a,
A groove parallel to the heat transfer tube 1 will be formed. In addition,
The notch 8 may be U-shaped or another shape. This groove functions as a cooling water channel (hereinafter referred to as an introduction groove) 9 shown in FIG. That is, the sprinkler 3 a is provided with means for dropping the cooling water toward each introduction groove 9, and the sprinkler 3 a
When the cooling water is dropped and sprinkled from a, some of the cooling water drops are captured by each layer of the air-cooling fins 2a, and those that are not captured flow downward along the introduction groove 9.

The air-cooled fin 2a is originally provided with a characteristic that the slit surface 6 allows the air-cooled fin 2a to easily spread.
In the vicinity of the notch 8 which is a catching portion of the cooling water droplets, the flat surface 7b prevents the water droplets from spreading easily and the thinning is suppressed. Therefore, the water droplets in that portion are heavier than those in the thin film shape, and can withstand the blowout by the cooling airflow C introduced by the fan 4 to some extent, and the scattering of the cooling water droplets is suppressed. However, the cooling water droplets are not affected by the cooling air flow C at all, that is, the cooling air flow moves from the flat surface 7b to the slit surface 6 and promotes the wetting and spreading of the air cooling fins 2a. Become.

According to the above structure, cooling water droplets are evenly applied to each layer of the air-cooling fins 2a, and the wetting and spreading characteristics of the cooling water on the heat exchange surface are improved, so that the heat exchange efficiency is improved. Not only this, but also the following effects can be obtained.

That is, the diffusion of the cooling water on the air-cooled fins 2a is carried out by the planar infiltration and movement after the water droplets are trapped in the cutouts 8, so that the space of the air-cooled fins 2a level as in the prior art. Throughout, there is no cooling water spray present. That is, in the hierarchical structure of the air-cooled fin 2a hierarchy,
The portion occupied by the cooling water is a limited area of the dropped water droplet and the heat exchange surface on the air cooling fin 2a. Therefore, even if SOx and NOx are present in the air, the trapping / dissolving region by the cooling water is narrowed, so that the dissolution of SOx and NOx is reduced accordingly, and the decrease in the PH of the cooling water is suppressed. As described above, according to the present embodiment, it is possible to remove the harmful effects of corrosion of internal equipment and scale adhesion due to SOx and NOx in the air.

In this embodiment, the tube holes 5 are formed in two rows, the heat transfer tubes 1 are arranged in two rows, and the heat exchange surface is formed by one air cooling fin 2a over the entire cross section. However, the present invention is not limited to this, and the heat transfer tubes 1 may be arranged in two or more rows, and as shown in FIG. 2, the tube holes 5 of the air-cooling fins 2b are arranged in one row, and each heat transfer tube is formed. 1 is provided with a notch 8, that is, each heat transfer tube 1
The introduction groove 9 and the flat surface 7b may be formed for each. FIG. 3 shows a structure assembled by the air cooling fins 2b. According to this example, cooling water is further supplied to each heat transfer tube 1 without impairing the operation and effect of the embodiment shown in FIG. 1, so that the heat transfer efficiency of each heat transfer tube 1 is
It is possible to further improve.

[0026]

According to the present invention, while improving the wetting and spreading characteristics of the cooling water to the air cooling fins, SOx and NO in the outside air
It is possible to suppress the dissolution of x in the cooling water, remove the corrosion caused by SOx and NOx, and the harmful effects of scale adhesion.
There is an effect that the heat transfer efficiency and the corrosion resistance of the device can be improved.

[Brief description of drawings]

FIG. 1 is a partial plan view showing an embodiment of the present invention.

FIG. 2 is a partial plan view showing another embodiment of the present invention.

FIG. 3 is a perspective view showing an assembled air-cooled fin of the embodiment shown in FIG.

FIG. 4 is a diagram illustrating a refrigerator cycle.

FIG. 5 is a cross-sectional view showing a conventional technique.

FIG. 6 is a perspective view of FIG.

FIG. 7 is an explanatory diagram showing a diffusion region of cooling water according to a conventional technique.

[Explanation of symbols]

 1 Heat Transfer Tube 2a Air-cooling Fin 2b Air-cooling Fin 3a Sprinkler 4 Fan 5 Pipe Hole 6 Slit Surface 7a Flat Surface 7b Flat Surface 8 Notch 9 Inlet Groove (Cooling Water Flow Path) b Cooling Water Flow Direction Cooling Air Flow Direction Cooling Air Flow Direction D Cooling water diffusion area

Claims (4)

[Claims] 1. A plurality of air-cooling fins are attached to a plurality of heat transfer tubes, which are provided in a heat exchange means of a refrigerator and through which a liquid flows, at predetermined intervals so as to traverse the flowing direction, and the outside air is supplied to each air-cooling fin. In the air-cooled radiator of the refrigerator, which sprays cooling water along with each heat transfer tube and radiates the heat of the liquid through each heat transfer tube and air cooling fin, near each heat transfer tube of each air cooling fin An air-cooling type heat dissipation device for a refrigerator, characterized in that a cutout is provided at an edge of the cooling water to form a flow path of the cooling water. 2. The air-cooling type heat dissipation device for a refrigerator according to claim 1, wherein a slit surface is formed on the heat exchange surface of each air cooling fin, and a flat surface is provided around a notch provided on the heat exchange surface. An air-cooled radiator for a refrigerator, which is characterized by being formed. 3. The air-cooling type heat dissipation device for a refrigerator according to claim 1, wherein the notch of each air-cooling fin is provided at the windward end edge of the outside air, and the flow direction of each heat-transfer tube. An air-cooling type radiator of a refrigerator, characterized in that a cooling water flow path is formed in the cooling water flow path, and a sprinkler for dropping the cooling water toward each cooling water flow path is provided. 4. The air-cooling type heat dissipation device for a refrigerator according to any one of claims 1 to 3, wherein each air-cooling fin is divided for each array of heat transfer tubes in a direction in which outside air flows, and An air-cooled radiator for a refrigerator, characterized in that a notch is provided near each heat transfer tube of an air-cooled fin.