JPH05223364A - Air cooling heat radiation apparatus of freezing cycle - Google Patents

Abstract

PURPOSE:To reduce the amount of sprinkled water without reducing the amount of heat radiation in apparatus of a freezing cycle where water is sprinkled to heat radiating fins to increase the amount of heat radiation. CONSTITUTION:An air cooling heat radiation apparatus of a freezing cycle comprises a heat transfer pipe 3 through the inside of which a refrigerant, etc., flow, a heat radiating fin 14 fixed onto the heat transfer pipe, an air cooling fan 5 for producing an air flow for cooling the heat radiation fin, a cistern tank 31 disposed upwardly of the heat radiating fin, and a water supply pipe 18 for feeding water to the cistern tank 31 via a solenoid valve 19. Further, it comprises a water sprinkling pipe 15 provided with a siphon pipe 32 for sucking water in the cistern tank 31 and a water sprinkler for sprinkling the sucked water to a fin surface, a controller 30 for controlling water supply to the cistern tank 31, and a water sensor part 34 provided on the heat radiating fin for detecting whether or not the fin surface is wetted with water. The controller 30 controls the opening/closing of the solenoid valve 19 in response to an output from the water sensor 34.

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 radiating device in which cooling water is sprayed on air-cooling fins to improve heat exchange efficiency. Regarding heat dissipation device.

[0002]

2. Description of the Related Art A refrigeration cycle is used for indoor cooling, refrigeration, a refrigerator, etc., and this refrigeration cycle is equipped with a heat dissipation device for cooling high-temperature refrigerant, absorbing liquid, etc. (hereinafter referred to as refrigerant). Have There are two types of heat radiators, a water-cooled type and an air-cooled type.In the air-cooled type, a plurality of heat transfer tubes in which a refrigerant or the like flows are arranged in parallel at intervals, and There is a forced air cooling type in which a large number of fins are attached to the outer surface at intervals in a direction orthogonal to the heat transfer tube and air is forcedly passed between the fins to radiate heat from the heat transfer tube. This forced air cooling type heat dissipation device is provided in an outdoor unit such as an indoor air conditioner or a large freezer, and has a structure in which outside air is sucked into the unit by a fan and the sucked outside air passes between the fins.

Further, since the heat dissipation device provided in this outdoor unit has a low cooling efficiency only by the air flow when the outside air temperature is high such as in summer, the water is sprayed on the fin surface of the heat dissipation device by the water spray device and adhered to the fin surface. There is a device in which the heat of vaporization at the time of evaporation of the water droplets is utilized to accelerate the heat dissipation.

FIGS. 5 and 6 show an example of a heat dissipation device equipped with such a sprinkler device. A cistern 31 is arranged above the air cooling fins 14 (downstream of the air flow generated by the cooling fan with respect to the air cooling fins). A water supply device 15 having an inverted U-shaped pipe (siphon pipe) 32 is provided in the cistern 31, and a water supply pipe 18 is connected to the cistern 31 via an electromagnetic valve 19. In this heat dissipation device, water is not sprayed continuously, but the solenoid valve 19 is opened / closed according to the change of the outside air temperature, and is placed in the cistern 31 as the water surface position in the cistern 31 rises and falls. Water is intermittently sprinkled on the fins 14 via the siphon pipe 32. According to this method, it is possible to reduce the amount of sprayed water because water is sprayed only when necessary.

[0005]

In the heat dissipating device equipped with the water sprinkler as described above, in order to maximize the improvement of the heat exchange efficiency due to the water sprinkling, the fins can be uniformly dispersed by the water sprinkled. It needs to be widely wet.
On the contrary, if the amount of water sprayed is too large, the water film on the surface of the fins becomes too thick, and the heat transfer efficiency may decrease, resulting in a decrease in the evaporation amount (vaporization amount) of water. In addition, the diffusion range and diffusion rate of water on the fin surface change due to changes over time on the fin surface (dirt, rust, foreign matter, etc.), and the amount of water vaporized is also affected by the humidity of the outside air. Therefore, if a certain amount of water is sprayed (even if it is adjusted to some extent by the outside air temperature), the fins cannot always wet the maximum range with the minimum amount of water, which improves the heat exchange efficiency and dispersion of the water. It was difficult to reduce the amount of water.

The object of the present invention is to always wet the fins to the maximum extent with a minimum amount of water.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to generate a heat transfer tube in which a refrigerant or the like flows, a fin for heat dissipation fixed to the heat transfer tube, and an air flow for cooling the fin for heat dissipation. An air-cooling fan for a refrigerating cycle, comprising: an air-cooling fan; a means for spraying water on the surface of the fins for heat dissipation; and a control means for controlling the supply of water to the means for spraying water. The heat radiating fin is provided with a moisture detecting section for detecting whether or not the surface of the fin is wet, and the control means supplies water to the means for spraying the water according to the output of the moisture detecting section. It is achieved by being controlled.

[0008]

The water sensor detects whether the fins at the position where the water sensor is attached are wet with the sprayed water, and outputs the result to the control means. The control means stops the supply of water to the means for spraying water on the fins in the case where the output means that the fins are wet, and the output means that the fins are dry according to the output of the moisture sensing unit. If so, start supplying water to the means for spraying water on the fins. In this way, the supply of water to the means for spraying water on the fin surface is controlled depending on whether or not the fin is wet, so that excessive water spray on the fin and leaving the fin in a dry state can be avoided. ..

[0009]

Embodiments of the present invention will be described below with reference to FIGS. The illustrated air-cooling type heat dissipation device which is an embodiment of the present invention includes a casing 2 having openings on the side surface and an upper surface, an air cooling fan 5 arranged in the opening portion on the upper surface, and a horizontal direction at the opening portion on the side surface. A plurality of heat transfer tubes 3 which are vertically arranged at intervals and through which a refrigerant or the like flows, and the heat transfer tubes 3
A large number of fins 14 for heat radiation, which are mounted on the outer surface of the fin at intervals in the direction orthogonal to the heat transfer tube, and the casing 2
A cistern 31 located above the fins 14 in
And a water supply pipe 18 connected to the cistern 31 via an electromagnetic valve 19, a siphon pipe 32 arranged in the cistern 31, one end connected to the siphon pipe 32 and a water sprinkler provided at the other end. The water sprinkling pipe 15, a moisture sensing unit 34 attached to the lowest fin of the fins 14, and the solenoid valve connected to the output end of the moisture sensing unit 34 according to the output value of the moisture sensing unit 34. And a controller 30 which is a control means for opening and closing the. Saistan 3
1, a water supply pipe 18 connected to the cistern 31 via a solenoid valve 19, a siphon pipe 32 arranged in the cistern 31, one end connected to the siphon pipe 32 and a water sprinkler provided at the other end. The water spray pipe 15 forms a means for spraying water on the fin surface.

As shown in FIG. 3, the moisture sensing portion 34 has a hydrophilic sponge-like body 34A composed of polyurethane resin, cellulose resin, butylene styrene copolymer, non-metal wool, natural fiber and the like, which are spaced from each other. In addition, two electrodes 34B are provided. A plurality of such moisture sensing parts 34,
The two electrodes 34B are attached to the lowermost fin.
And the controller 30 are connected by a signal line 30A. A voltage is applied to the signal line 30A, and when the spongy body absorbs water, the current flowing between the two electrodes increases, and the controller 30 detects that the current has increased. There is.

When the heat dissipation device constructed as described above is activated, the spongy body is dry and the current flowing between the two electrodes is small because water is not initially sprinkled. The controller 30 determines that the fins are not wet because the current flowing through the signal line is small, and opens the solenoid valve 19 when the outside air temperature is higher than a predetermined temperature. When the solenoid valve 19 is opened, water flows from the water supply pipe 18 to the cistern 31, and the water surface of the cistern 31 rises. When the water surface reaches the top of the siphon pipe, water flows through the water sprinkling pipe 15 and is sprayed from the water sprinkler to the fins 14. The sprinkled water flows down while wetting the fins, and eventually reaches the moisture sensor 34. When the water reaches the moisture sensing unit 34, the spongy body of the moisture sensing unit 34 absorbs water, the electrodes are connected by water, and the current flowing increases. The controller 30 detects the current flowing through the signal line, determines that the fin at the bottom is wet when the value of the flowing current exceeds a predetermined value, and closes the solenoid valve 19.

When the solenoid valve 19 is closed, the sister 31
The inflow of water into the water will stop, and eventually the water will not flow into the sprinkler pipe 15. When the water does not flow to the sprinkler pipe 15, the spraying of the water from the sprinkler to the fins is interrupted, and the water on the fin surfaces evaporates, and the water absorbed in the spongy bodies of the water sensor 34 also evaporates. When the water absorbed in the sponge body evaporates, the current flowing between the electrodes decreases, and the controller 30 opens the solenoid valve 19 again and starts supplying water to the cistern 31.

By repeating the above-mentioned procedure, the fins are always kept in a wet state, and the water supply to the cistern 31 is stopped when the fins at the bottom are wet, so that water may be excessively sprinkled. can avoid.

In the above-mentioned example, when one of the plurality of moisture sensing parts senses moisture, the solenoid valve is closed. However, for example, 60% of the plurality of moisture sensing parts sense moisture. The electromagnetic valve may be closed when the moisture is detected, or the electromagnetic valve may be closed when the entire moisture is detected. Further, the electromagnetic valve may be closed after a lapse of a predetermined time after one or several of the plurality of moisture sensing parts senses moisture. The solenoid valve may be opened when less than 60% of the whole of the plurality of moisture sensing parts senses moisture, and the solenoid valve may be closed when more than 60% senses moisture. Sensing unit 34
Alternatively, the electromagnetic valve 19 may be closed at the middle fin instead of at the bottom, and the solenoid valve 19 may be closed at the time when the wetting of the middle fin is detected or after a lapse of a predetermined time. By doing this, the time from the time when the fins on which the moisture sensor 34 is installed is wet to the time when the fins at the bottom are wetted is measured, and the spraying of water is stopped after the fins at the bottom are wet. It is possible to adjust the time until.

Furthermore, the strength of the cooling air flow by the air-cooling fan is not always uniform with respect to each stage of the fins and with respect to the lateral position of the fins. Moreover, the surface of the fin is not limited to dry at the bottommost fin. Therefore, a position where the surface of the fin is first dried after the spraying of water on the fin is stopped is confirmed in advance, and the solenoid valve 19 is set at that position.
By providing the moisture sensing unit for instructing the opening of the solenoid valve and the moisture sensing unit for instructing the closing of the electromagnetic valve 19 in the middle position as described above, the range where the fins are not wet and the time when the fins are not wet can be reduced. Can be made smaller.

As the arrangement of the moisture sensing portion, a method of arranging a plurality of sponge-like bodies each having a pair of electrodes at intervals, a plurality of pairs of electrodes are arranged in one long sponge-like body. It is possible to adopt a method in which the long sponge-like body is horizontally mounted on the fins after mounting.

As the type of the moisture sensing unit, in addition to the pair of electrodes 34B provided on the sponge-like body 34A shown in FIG. 3, as shown in FIG. 4, the moisture sensor 3 is provided on the sponge-like body 34A.
4C may be attached and the signal line 30A may be connected to the moisture sensor 34C.

[0018]

According to the present invention, the moisture sensor is attached to the fin, and water is sprayed to the fin after detecting whether the fin is wet or not. Even when the fluctuation occurs, it is possible to suppress the occurrence of dryness of the fin portion and avoid excessive water sprinkling, and it is possible to suppress an increase in the amount of water sprinkling while maintaining a high heat radiation amount.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of an embodiment of the present invention viewed from the side of a fin.

2 is a schematic view of a portion of the embodiment shown in FIG. 1 as seen from the front of the fin. FIG.

FIG. 3 is a schematic diagram showing a portion of the embodiment shown in FIG.

FIG. 4 is a schematic view showing another example of the portion of the embodiment shown in FIG.

FIG. 5 is a schematic diagram showing an example of the prior art.

FIG. 6 is a schematic view of the prior art example shown in FIG. 5 as seen from the front of the fin.

[Explanation of symbols]

2 casing 3 heat transfer pipe 5 air cooling fan 14 fins 15 water sprinkling pipe 18 water supply pipe 19 solenoid valve 30 controller (control means) 30A signal line 31 cistern 32 siphon pipe 34 moisture sensing unit 34A spongy body 34B electrode 34C moisture sensor

Claims (1)

[Claims] 1. A heat transfer tube in which a refrigerant or the like flows, a fin for heat dissipation fixed to the heat transfer tube, an air-cooling fan for generating an air flow for cooling the fin for heat dissipation, and the fin for heat dissipation. In an air-cooled radiator of a refrigeration cycle, comprising a means for spraying water on the surface and a control means for controlling the supply of water to the means for spraying the water, the fin for heat dissipation has a surface of the fin. A water sensor for detecting whether or not it is wet is attached, and the control means controls the supply of water to the means for spraying the water according to the output of the water sensor. An air-cooled radiator for a refrigeration cycle.