JPH0989394A - Cooler for finned tube condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the abnormal rise of the condensing temperature of a finned tube condenser by so controlling that the drain water is injected from the injection nozzle when the detected value of a detector arrives at the allowable maximum value of the condensing temperature or pressure of the condenser. SOLUTION: When the condensing temperature of a condenser 5 is high by comparing the condensing temperature of the condenser 5 detected by a temperature sensor 43 with the allowable maximum value of the condensing temperature of the condenser 5 which is allowed such as, for example, about 53 deg.C by a controller 45, a pump 39 is driven for a short time set to a timer 46 such as, for example, five seconds. Then, an injection nozzle 40 injects the drain water of a drain pan 7 to the condenser 5, and the injected water is adhered to the fins of the condenser 5 and evaporated. In the case of the evaporation, the condenser 5 is cooled by the latent heat of the water. Accordingly, it is so controlled that the condensing temperature of the condenser 5 does not exceed 53 deg.C of the allowable maximum value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fin tube condenser cooling device for cooling a fin tube condenser forming a part of a refrigeration cycle.

[0002]

2. Description of the Related Art This type of cooling device for a fin tube condenser is used in, for example, a refrigerating / refrigerating showcase, a refrigerating / refrigerating machine, a cooling storage such as a vending machine, an air conditioner, and the like. The fin-tube condenser that composes is air-cooled by a blower.

By the way, when the refrigeration cycle equipped with the fin tube condenser is driven, drain water is generated. Generally, this drain water is stored in a drain dish. When the drain water is collected in a predetermined amount in the drain dish, the drain dish is taken out and the drain water is discharged to the outside, or is drained to the outside through a drain pipe connected to the drain dish.

As another drain water treatment means, a fin tube condenser cooling device for treating drain water is used. This fin tube condenser cooling device is described in, for example, Japanese Patent Publication No. 5-40215 (F24F1 / 02). In this cooling device, the drain water in the drain dish is constantly lifted up, sprayed on the condenser to be evaporated, and the drain water is treated.

[0005]

The fin tube condenser cooling device cools the fin tube condenser by raising the temperature of the air blown to the fin tube condenser when the outside air temperature is high such as in summer. Efficiency drops. Further, when the outside air temperature is high as described above, the load applied to the refrigeration cycle generally increases. Therefore, the condensing temperature and the condensing pressure of the fin tube condenser may rise abnormally. Then, if the condensing temperature or the condensing pressure rises abnormally,
The coefficient of performance of the refrigeration cycle may deteriorate, and the discharge temperature of the compressor may rise, which may deteriorate the lubricating oil.

Further, in the case of the fin tube condenser cooling device for treating drain water, the drain water is always treated, and the evaporation of the drain water during this treatment causes
The condenser is constantly cooled. Therefore, in a case where the outside air temperature is low, such as in winter, the condensation temperature of the condenser may be too low, and the refrigerating capacity of the refrigeration cycle may be reduced.

The present invention is intended to solve the above problems, and provides a cooling device for a fin tube condenser which can prevent the condensation temperature of the fin tube condenser from rising abnormally. Has an aim. Further, another object of the present invention is to provide a fin tube condenser cooling device that does not abnormally reduce the condensation temperature of the condenser even when the outside air temperature is low.

[0008]

In order to achieve the above object, a fin tube condenser cooling device according to the present invention comprises a condenser blower (6) for air-cooling a fin tube condenser (5) of a refrigeration cycle. A drain tray (7) for collecting drain water generated when the refrigeration cycle is driven,
A pump (39) for pumping the drain water accumulated in the drain tray and an injection nozzle (40) for injecting the drain water pumped by the pump into the fin tube condenser.
A detection device (43) for detecting the condensing temperature or the condensing pressure of the fin tube condenser, and the permissible maximum value of the condensing temperature or the condensing pressure of the fin tube condenser is set. And a control means (45) for controlling so that drain water is jetted from the jet nozzle when the detection value of the detection device reaches.

Further, a timer (46) is provided in which an injection time for continuously injecting from the injection nozzle is set, and when the detection value of the detection device reaches the allowable maximum value, the timer is activated. There may be a case where a control unit that controls to eject the drain water from the injection nozzle only during the set injection time is provided.

Further, a dust removing filter (4) for removing dust mixed in the air blown to the fin tube condenser is provided, and the injection nozzle is provided with the dust removing filter and the fin tube condenser. It may be placed between the container and the container.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of a cooling device for a fin tube condenser according to the present invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 1 is a perspective view of a refrigerating showcase in which the fin tube condenser cooling device of the present invention is installed. FIG. 2 is a sectional view of FIG. FIG. 3 is an explanatory diagram of the cooling device for the fin tube condenser. FIG. 4 is a front view of the drain tray. FIG. 5 is a time chart of the operation of the fin tube condenser cooling device.

In FIGS. 1 and 2, a refrigerating open showcase 1 serving as a cold storage for displaying various products such as soft drinks, bento, ham, and fruits is formed with an opening 2 for storing and taking out products, and a lower portion thereof is formed below the opening 2. A machine room 3 is arranged in the. The machine room 3 is provided with a dust removing filter 4 for the condenser, a fin tube condenser 5, a blower 6 for the condenser, a drain tray 7, a compressor and the like. As is well known, the fin tube condenser 5 includes a refrigerant tube which is a tube through which a refrigerant passes, and a plurality of fins attached to the refrigerant tube. This refrigerant pipe is arranged in a meandering manner so as to traverse the air flow generated by the condenser blower 6, while the fins are arranged substantially vertically along the air flow. The upper wall 8, the rear wall 9 of the showcase 1 and the bottom wall 10 which is a partition wall with the machine room 3 constitute a heat-insulating box whose one surface is open, and are made of foamed synthetic resin such as hard foamed polyurethane. It consists of the heat insulating material 11.

A partition top plate 13, a partition wall plate 14 and a partition floor plate 15 which are made of a metal plate such as a coated steel plate or stainless steel which does not rust are arranged at an appropriate distance from the inner surface of the heat insulating material 11. The space between the partition top plate 13, the partition wall plate 14, the partition floor plate 15 and the heat insulating material 11 serves as a cool air passage 16. Further, in a display room 17 as a storage room surrounded by the partition top plate 13, the partition wall plate 14 and the partition floor plate 15, a product display shelf 18 is supported by a pair of left and right support brackets 19.

Further, the cold air flow path 1 below the partition floor plate 15
6, a blower 20 is provided at the rear of the partition wall plate 14
A cooler 21 is arranged at 6. This cooler 21
Constitutes a well-known refrigeration cycle with the condenser 5 and the compressor arranged in the machine room 3. When this refrigeration cycle operates, the cooler 21 is cooled. Then, when the blower 20 rotates, the air in the cool air flow path 16 is blown in the direction of the arrow and forcedly circulates. That is, the air blown from the blower 20 moves to the cooler 21, is cooled, and rises to be discharged from the cool air discharge port 23 into the display chamber 17. Then, the cool air blown out from the cool air outlet 23 forms an air curtain in the front surface of the display room 17, that is, in the product storage and take-out opening 2, and cools the inside of the display room 17. The air that has cooled the inside of the display room 17 is sucked through the suction port 24 formed on the front side of the partition floor plate 15 and returns to the blower 20.

In this way, the interior of the showcase 1 is cooled, but at that time, the cooler 21 is frosted. Since this frost is appropriately melted and defrosted, defrosting water that is drain water is generated from the cooler 21. The drain water passes through the drain pipe 31 formed on the bottom wall 10 of the display room 17 and the drain hose 32 connected to the drain pipe 31, and is dropped and stored in the drain tray 7. As shown in FIG. 4, a drainage port 36 for a pump and an external discharge port 37 are formed in the drain tray 7. The pump drainage port 36 is formed on a substantially vertical side wall of the drain tray 7, and the attachment portion thereof is arranged at a position higher than the bottom surface of the drain tray 7. On the other hand, the external outlet 37 is
It is formed on the horizontal surface of the drain tray 7 which is formed one step higher than the bottom surface of the drain tray 7, and the mounting portion thereof is arranged at a position higher than the pump drain port 36. When the drain water collects in the drain tray 7 configured as described above up to the position of the attachment portion of the external discharge port 37 of the drain dish 7, the drain water passes through the external discharge port 37 to the outside of the showcase 1. Is discharged.

Further, in FIG. 3, the suction port of the pump 39 is connected to the pump drain port 36 of the drain tray 7, and the injection nozzle 40 is connected to the discharge port of the pump 39. This injection nozzle 40 is provided with a plurality of ejection ports, is arranged between the condenser dust removal filter 4 and the condenser 5, and is located on the air intake side of the condenser 5. In addition, a pressurized refrigerant from the compressor, such as CFCs or alternative CFCs, flows into the inlet 5a of the condenser 5, and the refrigerant is liquefied in the condenser 5 and discharged from the outlet 5b of the condenser 5. It flows to the cooler 21. And
A temperature sensor 43 for detecting the refrigerant temperature on the outlet side of the condenser 5, that is, the condensation temperature, is attached to the pipe connected to the outlet 5b of the condenser 5. The detection signal of the temperature sensor 43 is input to the control device 45. A signal from a timer 46 is input to the control device 45, and a control signal is output from the control device 45 to the pump 39.

Blower 6, condenser drain 7, pump 3 for condenser
9, injection nozzle 40, temperature sensor 43, controller 4
5 and the timer 46 constitute a fin tube condenser cooling device, and normally, the condenser blower 6 cools the condenser 5 by air. By the way, when the outside air temperature is high, such as in the summer, the condensation temperature of the condenser 5 cannot be lowered to an appropriate temperature only by cooling with the condenser blower 6, and the condensation temperature of the condenser 5 rises. There is.
Therefore, the controller 45 is set in advance with an allowable maximum value at which the condensation temperature of the condenser 5 may rise, for example, about 53 ° C. Then, the control device 45 compares the allowable maximum value with the condensation temperature of the condenser 5 detected by the temperature sensor 43, and when the condensation temperature of the condenser 5 is higher, the timer 46 is set. The pump 39 is driven for a short time, for example, 5 seconds. Then, the injection nozzle 40 injects the drain water of the drain tray 7 into the condenser 5. The injected drain water adheres to the fins of the condenser 5 and evaporates. At the time of this evaporation, the condenser 5 is cooled by the latent heat of drain water. Therefore, as shown in FIG. 5, the condensation temperature of the condenser 5 is controlled so as not to exceed the allowable maximum value of 53 ° C.

As described above, in the embodiment, the pump drainage port 36 is formed on the substantially vertical side wall of the drain tray 7, and the mounting portion thereof is arranged at a position higher than the bottom surface of the drain tray 7. As a result, the pump 39 is prevented from sucking the dust and dirt settled on the bottom of the drain tray 7. As a result, it is possible to extend the life of the pump and prevent clogging of the ejection port of the ejection nozzle 40.

Further, a plurality of jet nozzles 40 are provided so that the drain water can be jetted over a wide range of the condenser 5. Therefore, the ejected drain water does not form a large lump, and the drain water attached to the fins of the condenser 5 is blown off by the air blow of the condenser blower 6, that is, pitch out is reduced. As a result, the condenser 5 can be cooled efficiently.

Further, since the injection nozzle 40 is located on the air intake side of the condenser 5, the drain water from the injection nozzle 40 is injected to the tips of the fins of the condenser 5 on the air intake side, and the fins are discharged to the fins. It is possible to remove dirt such as dust and dirt that has adhered. This removal is effective because it is particularly effective against dirt on the fin tips on the air intake side, which greatly affects the cooling efficiency.

Since the drain water is jetted from the jet nozzle only during the jet time set in the timer, the drain water is not jetted to the condenser more than necessary. Therefore, devices such as the motor and compressor of the condenser blower located on the air discharge side of the condenser are less likely to get wet with the injected drain water.
As a result, it is less likely that the drain water will adhere to the equipment and the equipment will fail. In addition, if the above equipment is placed on the air intake side of the condenser so that the equipment such as the motor for the blower for the condenser and the compressor do not get wet with the sprayed drain water, the exhaust heat of these equipment and the equipment The generated oil droplets and dust will adversely affect the condenser.

The embodiment of the present invention has been described above in detail.
The present invention is not limited to the above embodiment,
Within the gist of the present invention described in the claims,
Various changes can be made. Modification examples of the present invention are exemplified below. (1) In the embodiment, the condensation temperature of the condenser 5 is detected, but it is possible to detect the condensation pressure instead of the condensation temperature. That is, as the condensation temperature increases,
Since the condensing pressure rises accordingly, it is possible to detect and control the condensing pressure instead of the condensing temperature.

(2) In the embodiment, the injection nozzle 40 is provided with a plurality of ejection ports to eject the drain water over a wide area of the condenser 5. However, the drain water is ejected in the form of mist. By adopting a jet port capable of performing the above, the drain water can be jetted over a wide range of the condenser 5. (3) In the embodiment, the maximum allowable condensation temperature of the condenser 5 is about 53 ° C., but the maximum allowable value can be changed as appropriate. However, the range of 50 ° C to 55 ° C is suitable.

(4) In the embodiment, the jetting time of the jetting nozzle 40 is about 5 seconds, but the jetting time can be appropriately changed according to the size of the condenser 5 and the like. However, if the jetting time is too short, the cooling effect is not so large, and conversely, if it is too long, the jetted drain water does not evaporate and adheres to the motor or compressor of the blower 6 for the condenser and causes electric leakage. Cause a breakdown. Therefore, the ejection time is suitably in the range of 1 to 30 seconds.

(5) The timer in which the jetting time of the jetting nozzle 40 is set is not limited to one that generates a clock pulse as long as the jetting time can be determined, and other electric or mechanical timers can be used. The structure and the like can be appropriately selected.

(6) In the embodiment, the injection nozzle 40 is arranged on the air intake side of the condenser 5, but the arrangement can be changed appropriately. For example, it may be arranged above the condenser 5. (7) In the embodiment, devices such as the condenser blower 6 and the compressor are arranged on the air discharge side of the condenser 5, but these devices can be arranged at appropriate positions. For example, it may be arranged on the air intake side of the condenser 5.

[0027]

According to the present invention, when the condensing temperature or condensing pressure of the fin tube condenser reaches the maximum allowable value, water is ejected from the injection nozzle to the fin tube condenser. The condensing temperature or condensing pressure of the fin tube condenser is less likely to exceed the maximum allowable value. As a result, it is possible to prevent deterioration of the coefficient of performance of the refrigeration cycle and deterioration of the lubricating oil.

Further, when the outside air temperature is low, the condensing temperature and the condensing pressure of the condenser rarely reach the maximum allowable values, so that water is not injected from the injection nozzle and the condenser of the condenser is condensed. It does not unnecessarily reduce the temperature and condensing pressure.

Furthermore, since the water jetted from the jet nozzle is drain water, it is not necessary to supply water from the outside.
Therefore, it is not necessary to install a pipe for supplying water, and the cost can be reduced.

Further, since the drain water is jetted from the jet nozzle only during the jet time set by the timer, the drain water is not jetted to the condenser more than necessary. Therefore, the devices located on the air discharge side of the condenser, such as the motor and compressor of the condenser blower, are less likely to get wet with the injected drain water. As a result, it is less likely that the drain water will adhere to the equipment and the equipment will fail.

Further, since the injection nozzle is arranged between the dust removing filter and the fin tube condenser,
Dust that has passed through the dust removal filter and attached to the condenser is cleaned by spraying drain water. As a result, it is possible to prevent a decrease in cooling efficiency due to dust and dirt attached to the condenser.

[Brief description of drawings]

FIG. 1 is a perspective view of a refrigerating showcase in which a fin tube condenser cooling device according to the present invention is installed.

FIG. 2 is a sectional view of FIG.

FIG. 3 is an explanatory view of a fin tube condenser cooling device.

FIG. 4 is a front view of a drain tray.

FIG. 5 is a time chart of the operation of the fin tube condenser cooling device.

[Explanation of symbols]

 4 Dust removal filter for condenser 5 Fin tube condenser 6 Blower for condenser 7 Drain plate 39 Pump 40 Injection nozzle 43 Temperature sensor (detection device) 45 Control device (control means) 46 Timer

Claims (3)

[Claims] 1. A blower for a condenser for air-cooling a fin tube condenser of a refrigeration cycle, a drain tray for collecting drain water generated when the refrigeration cycle is driven, and drain water accumulated in the drain tray. A pump for pumping the water, a jet nozzle for injecting the drain water pumped by the pump to the fin tube condenser, a detection device for detecting the condensation temperature or the condensation pressure of the fin tube condenser, and the fin tube condenser. A condensing temperature or a condensing pressure is set to an allowable maximum value, and when the detected value of the detection device reaches the allowable maximum value, a control means for controlling the jetting of drain water from the injection nozzle is provided. A cooling device for a fin tube condenser, which is characterized in that 2. A timer is provided in which an injection time for continuously injecting from the injection nozzle is set, and the timer is set when the detection value of the detection device reaches the allowable maximum value. Only during the injection time,
The fin tube condenser cooling device according to claim 1, further comprising: a control unit that controls so as to eject the drain water from the injection nozzle. 3. A dust removing filter for removing dust mixed in air blown to the fin tube condenser, wherein the injection nozzle includes the dust removing filter and the fin tube condenser. The fin tube condenser cooling device according to claim 1 or 2, wherein the cooling device is provided between the fin tube condenser and the fin tube condenser.