JP3233799B2 - Cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for an ice machine, a freezer, a cooling storage, etc., and more particularly to a cooling device having an air-cooled condenser and a water-cooled condenser.

[0002]

2. Description of the Related Art In the restaurant industry, which has been remarkably developed in recent years,
As the heat exhausted from each device increases as the automation and mechanization of each part progresses, ice beds are used to improve the appearance of the provided food, and ice cold water is provided to improve the service, As the amount of ice used increases, the amount of heat exhausted from the ice maker also tends to increase, and particularly in existing stores, problems arise from both the cooling cost and the cooling capacity of the room where the ice maker is installed.

[0003] That is, in a store designed to use a water-cooled refrigerant condenser in order to reduce the heat exhausted from the ice machine to the room, the use of cooling water is expensive in an ice machine equipped with a water-cooled refrigerant condenser. However, when the cost of ice making is high, air-water cooling is newly introduced as a refrigerant condenser for ice making machines in order to greatly reduce the cost of water supply, especially in summer,
The ventilation and cooling functions of the store against the hot air discharged from the air-cooled refrigerant condenser into the room may be insufficient, and the working environment such as the room where the ice machine is installed may be deteriorated.

For this reason, the air-water-cooled refrigerant condenser is normally operated. However, when the exhausted hot air from the air-cooled refrigerant condenser to the room is to be exhausted, such as when the air temperature is relatively high, the air-cooled refrigerant condenser is operated. It is necessary to stop the operation of the condenser and operate only the water-cooled refrigerant condenser. However,
When only the water-cooled refrigerant condenser is operated, the ventilation in the machine room inside the ice maker deteriorates and hot air is trapped in the machine room, causing the refrigerant compressor to overheat and failing to ensure its good operation. There is a risk of adversely affecting the performance and the life of the refrigerant compressor or its electrical components.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cooling device such as an ice machine, a freezer, a cooling storage, and the like, and more particularly, to a cooling device having an air-cooled refrigerant condenser and a water-cooled refrigerant condenser. When the operation of the condenser is stopped and the water-cooled refrigerant condenser is operated, overheating is prevented at the temperature rising part of the refrigerant compressor or the like, thereby ensuring good operation of the cooling device, and the life of the cooling device. Is to be extended.

[0006]

SUMMARY OF THE INVENTION Accordingly, a cooling device according to the present invention is a cooling device having an air-cooled refrigerant condenser and a water-cooled refrigerant condenser. a temperature detector of the refrigerant flowing out, and a cooling means of the heated region, said cooling means, the temperature
The first cooling, which is a cooling fan installed close to the warm part
Means and a valve for allowing the refrigerant to bypass the evaporator of the cooling device.
Open / close valves installed in the bypass flow path and the bypass flow path
The air-cooled refrigerant.
The operation of the condenser stops, and the temperature detector sets the first set value.
When the above temperature is detected, the second cooling means operates.
And the second temperature detector is higher than the first set value.
The first cooling means operates when a temperature equal to or higher than a set value is detected .

[0007]

In other words, when the operation of the air-cooled refrigerant condenser is stopped, even if the cooling fan of the air-cooled refrigerant condenser is stopped and its ventilation performance is extinguished, the temperature rising portion of the cooling device or The temperature of the refrigerant flowing out of the
The second when the detector detects that it has exceeded 1 set value
When the cooling means is activated, the temperature becomes higher than the first set value.
If the detector detects that it has exceeded the high second set value
Can first cooling means is operated, since the temperature rise portion can be cooled stably, it is possible to easily avoid the original Nuisance defects overheating of heated site.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following, each embodiment of the present invention will be described with the same reference numerals assigned to the same parts. In the cooling device 20 of the auger type ice making machine shown in FIG. 1, the refrigerant gas compressed by the compressor 21 is air-cooled through a small-capacity primary air-cooled condenser 23 to which cooling air is constantly supplied by a cooling fan 22, By lowering the temperature to about 60 ° C., which is the saturation temperature of the refrigerant, the liquid-cooled condenser
After passing through an oil cooler (not shown) in the compressor 21, the air is again cooled by the cooling fan 22 and condensed by passing through a secondary air-cooled condenser 25 to which cooling air is constantly supplied. Next, the condensed refrigerant is guided to the receiver tank 26, is completely liquefied, further passes through the dryer 27, and is rapidly decompressed at the expansion valve 28.
By evaporating in the evaporator 29, heat is taken from the ice making water to perform an ice making action, and then circulated to the compressor 21 again.

An automatic water supply valve 31 is installed in a cooling water pipe 30 connected to the water-cooled condenser 24, and the automatic water supply valve 3
1 is controlled to open and close by detecting the level of the temperature or pressure of the refrigerant liquid in the refrigerant passage between the compressor 21 and the primary air-cooled condenser 23, and since this detection portion is disposed on the high pressure side. The detection error due to the pressure loss of the refrigerant flow is reduced. Furthermore, the compressor 2
A cooling fan 40 is installed in the vicinity of the refrigerant discharge pipe 1 and a detector 4 for detecting the temperature of the compressor 21, for example, the temperature of the refrigerant discharge pipe or the temperature of the refrigerant discharged from the compressor 21.
1 is installed.

In the above apparatus, since the ambient temperature is low, the cooling capacity of the air-cooled condensers 23 and 25 becomes relatively large, and the temperature or pressure of the refrigerant liquid flowing out of the secondary air-cooled condenser 25 is equal to or lower than a set value. Sometimes, the automatic water supply valve 31 is closed and the water-cooled condenser 24 does not perform the cooling operation of the refrigerant, but the ambient temperature becomes relatively high and the secondary air-cooled condenser 2
When the temperature or pressure of the refrigerant liquid flowing out of the tank 5 rises and exceeds the above-mentioned set value, the automatic water supply valve 31 is opened and the cooling water is supplied to the water-cooled condenser 24.
Is also operated to lower the temperature or pressure of the refrigerant liquid appropriately, and at the same time, the primary air-cooled condenser 23 and the secondary air-cooled condenser 2 are supplied to the room where the ice making machine is installed.
The amount of heat exhausted from 5 is reduced by the operation of the water-cooled condenser 24, and the machine room inside the ice making machine is constantly ventilated by the cooling fans 22 of the air-cooled condensers 23 and 25.

On the other hand, as shown in FIG. 2, the switch S3 is manually or automatically switched as required, and the switching is performed by the cooling fan 22.
At this time, the temperature of the compressor 21 or the temperature of the refrigerant discharged from the compressor 21 rises above a set value of, for example, 100 to 120 ° C. due to an increase in the ambient temperature or the like. When the detector 41 detects the high temperature, the thermo switch Th3 is closed and the circuit of the cooling fan 40 is closed, so that the cooling fan 22 stops, and the air-cooled condensers 23 and 25 stop operating. In a state where the water-cooled condenser 24 continues to operate, the cooling fan 40 starts operating.

Accordingly, the cooling fan 40 can surely cool the compressor 21, and can prevent the compressor 21 from overheating, thereby ensuring the normal operation of the compressor 21. As a result, the cooling fan 22 stops, so that a large amount of exhausted hot air does not flow from the air-cooled condensers 23 and 25 into the room that is relatively high in temperature as the ambient temperature rises, thereby maintaining a good working environment in the room. The cooling fan 40 has a minimum necessary capacity for cooling the compressor 21 and the cooling fan 40
The operation of the machine makes it possible to properly ventilate the machine room inside the ice machine and eliminate stagnation of warm air, so that the temperature inside the machine room is suppressed, so that the ice machine can exhibit its performance sufficiently, Further, the life of the compressor 21 or its electrical components can be easily extended, and the operation reliability as an ice maker can be improved. In addition, the structure and assembly of the cooling fan 40 are simple, and cost increase can be easily suppressed.

When the temperature or pressure of the refrigerant liquid flowing out of the secondary air-cooled condenser 25 drops below a set value due to a decrease in ambient temperature or the like, it becomes unnecessary for the water-cooled condenser 24 to cool the refrigerant. Since the automatic water supply valve 31 is closed, the consumption of the cooling water can be significantly reduced as compared with the conventional case, and the operation cost of the ice making machine can be easily reduced.

Next, in the second embodiment shown in FIG.
In addition to the same refrigerant circuit and the same cooling mechanism as in the above-described embodiment, a bypass flow path 50 that connects the upstream side of the expansion valve 28 and the downstream side of the evaporator 29 is provided. An on-off valve 51 is installed and a capillary tube or an injection valve 52 is installed. As shown in FIG.
When the circuit of the cooling fan 22 is interrupted by the switching of the temperature, the temperature of the compressor 21 or the temperature of the refrigerant discharged from the compressor 21 becomes 100
When the temperature rises beyond the set value of about 120 ° C. and the detector 41 detects the high temperature, the thermoswitch Th3 is closed and the circuit of the solenoid on-off valve 51 is closed. Therefore,
When the cooling fan 22 stops and the operation of the air-cooled condensers 23 and 25 is stopped and only the water-cooled condenser 24 continues to operate, when the temperature of the compressor 21 or the like reaches a set value or more, the electromagnetic opening and closing is performed. The valve 51 is opened and a part of the refrigerant liquid is
And the compressor 21 is cooled by the refrigerant that has passed through the capillary tube or the injection valve 52, so that the compressor 21 can be prevented from being overheated.

Further, in a third embodiment shown in FIG. 5, a refrigerant circuit and a cooling mechanism for the same refrigerant as those of the above-described embodiments, and a cooling fan of the first embodiment installed near the compressor 21 are provided. 40 and the bypass flow path 50 of the second embodiment, and as shown in FIG.
When the circuit of the cooling fan 22 is interrupted by the switching of the temperature, the temperature of the compressor 21 or the temperature of the refrigerant discharged from the compressor 21 rises above the first set value due to an increase in the ambient temperature or the like. Detects the high temperature, the thermo switch Th3 is closed, the circuit of the solenoid on-off valve 51 is closed, and the temperature of the compressor 21 or the temperature of the refrigerant discharged from the compressor 21 exceeds the first set value. High second
When the temperature rises above the set value and the detector 41 detects the high temperature, the thermo switch Th4 is closed and the cooling fan 40 is operated.

Therefore, when the cooling fan 22 is stopped and the operation of the air-cooled condensers 23 and 25 is stopped and only the water-cooled condenser 24 continues to operate, the temperature of the compressor 21 and the like becomes the first temperature.
When the pressure reaches the set value or more, first, the electromagnetic on-off valve 51 is opened, a part of the refrigerant liquid is led to the bypass flow path 50, and the compressor 21 is cooled by the refrigerant that has passed through the capillary tube or the injection valve 52, and the compressor 21 is cooled. Although the overheating of the compressor 21 is prevented, when the temperature of the compressor 21 and the like further rises and reaches the second set value higher than the first set value, the cooling fan 40 starts operating to cool the compressor 21. In addition, the overheat prevention of the compressor 21 can be further ensured, and the operation and effect of the two embodiments can be exhibited together. In this case, the capacity of the cooling fan 40 can be appropriately reduced by using the bypass passage 50 together. You can do it.

As shown in FIG. 7, the use of the oil cooler in each of the above embodiments is omitted, and the water-cooled condenser 24 is used.
The refrigerant flowing out of the compressor is guided directly to the secondary air-cooled condenser 25, and the temperature of the compressor 21 when the cooling fan 22 is stopped or the temperature of the refrigerant discharged from the compressor 21 is detected as in the first embodiment. When the compressor 41 detects a high temperature equal to or higher than the set value, by operating the cooling fan 40 installed near the refrigerant discharge pipe of the compressor 21, the same operation and effect as in the first embodiment can be obtained. Alternatively, as in the case of the second embodiment, a bypass passage 50 provided with an electromagnetic opening / closing valve 51 and a capillary tube or an injection valve 52 is provided, and the temperature of the compressor 21 or the compressor 2
When the detector 41 of the refrigerant temperature discharged from 1 detects a high temperature equal to or higher than the set value, the electromagnetic on-off valve 51 is opened to guide a part of the refrigerant liquid to the bypass flow path 50 and cool the compressor 21. Accordingly, the same operation and effect as those of the second embodiment can be achieved. Further, the cooling fan 40 of the first embodiment and the bypass flow passage 50 of the second embodiment, which are installed close to the compressor 21, can be provided. In addition, when the cooling fan 22 is stopped, the temperature of the compressor 21 or the temperature of the refrigerant discharged from the compressor 21 rises above a first set value due to an increase in ambient temperature or the like, and the detector 41 detects the high temperature. Is detected, the electromagnetic on-off valve 51 is opened to cool the compressor 21 by a part of the refrigerant liquid guided to the bypass flow path 50, and the temperature of the compressor 21 or the refrigerant discharged from the compressor 21 Temperature is the first set value When the temperature rises beyond the high second set value and the detector 41 detects the high temperature, the cooling fan 40 starts operating to cool the compressor 21, thereby achieving the same operation and effect as in the third embodiment. Will be able to play.

Further, as shown in FIG.
From the evaporator 29 to the compressor 21
A heat exchange unit 60 is provided in contact with a pipe leading to the air passage, and the refrigerant flowing from the dryer 27 to the expansion valve 28 is supercooled in the heat exchange unit 60. As in the case of the first embodiment, a detector is provided. By operating the cooling fan 40 by 41, the same operation and effect as in the first embodiment can be obtained. Alternatively, the bypass passage 50 is provided as in the case of the second embodiment, and the electromagnetic wave is detected by the detector 41. The on-off valve 51 is opened to guide a part of the refrigerant liquid to the bypass passage 50, and the compressor 21
The same effect as that of the second embodiment can be obtained by cooling the cooling fan. Further, similarly to the case of the third embodiment, the cooling fan 40 of the first embodiment and the bypass of the second embodiment can be obtained. A flow path 50 is provided, and when the detector 41 detects a high temperature equal to or higher than the first set value, the electromagnetic opening / closing valve 51 is opened, and when the detector 41 detects a high temperature equal to or higher than the second set value, the cooling fan 40 is activated. By starting the operation, the same operation and effect as those of the third embodiment can be obtained.

Further, as shown in FIG.
When a hot gas path 71 that directly communicates from the outlet side of 1 to the inlet side of the evaporator 29 is formed, and a hot gas valve 72 is installed in the hot gas path 71 to perform defrosting or deicing of the evaporator 29, By stopping the cooling fan 22 and closing the automatic water supply valve 31 and opening the hot gas valve 72, a high-temperature refrigerant gas is guided from the compressor 21 to the evaporator 29, as in the first embodiment. By operating the cooling fan 40 by the detector 41, the same operation and effect as in the first embodiment can be obtained. Alternatively, the bypass passage 50 is provided in the same manner as in the second embodiment, and
By opening the electromagnetic on-off valve 51 to guide a part of the refrigerant liquid to the bypass flow path 50 and cool the compressor 21,
The same operation and effects as those of the second embodiment can be obtained. Further, similarly to the third embodiment, the cooling fan 40 of the first embodiment and the bypass flow passage 50 of the second embodiment are provided. When the detector 41 detects a high temperature equal to or higher than the first set value, the electromagnetic on-off valve 51 is opened, and when the detector 41 detects a high temperature equal to or higher than the second set value, the cooling fan 40 starts operating. Thus, the same operation and effect as those of the third embodiment can be obtained.

Note that the first set value and the second set value in the above-described embodiment in which the compressor cooling fan and the bypass flow path are provided are reversed as required, so that the compressor is operated when only the water-cooled condenser is operated. When the temperature of the refrigerant or the temperature of the refrigerant discharged from the compressor rises to the second set value or more and the temperature detector detects the high temperature, first, the cooling fan installed near the compressor is operated to start the compression. When the temperature of the compressor is increased, the temperature of the compressor or the temperature of the refrigerant discharged from the compressor further rises to reach a first set value higher than the second set value, and the temperature detector detects the high temperature. Even if the compressor is cooled by a part of the refrigerant liquid by opening the solenoid on-off valve of the bypass flow passage, it is needless to say that the same operation and effect as those of the above embodiment can be obtained. Is a cooler or Also cooling device built box like those that can be carried out in the same manner.

[0021]

In the cooling device according to the present invention, when the operation of the air-cooled refrigerant condenser is stopped, the ventilation performance of the air-cooled refrigerant condenser is extinguished by stopping the cooling fan. Also, the temperature of the cooling device or the temperature of the refrigerant flowing out of the heating portion has become equal to or higher than the first set value.
When the second cooling means operates when the detector detects that
Both can be the temperature in operation the first cooling means can the detector detects that a higher second set value or more than the first set value, to stably cool the heated portion As a result, it is possible to easily avoid troubles due to overheating of the temperature rising portion, and as a result, it is possible to enhance the commercial value of a product provided with the cooling device.

[Brief description of the drawings]

FIG. 1 is a schematic circuit diagram according to a first embodiment of the present invention.

FIG. 2 is a control circuit diagram of the first embodiment.

FIG. 3 is a schematic circuit diagram according to a second embodiment of the present invention.

FIG. 4 is a control circuit diagram of the second embodiment.

FIG. 5 is a schematic circuit diagram according to a third embodiment of the present invention.

FIG. 6 is a control circuit diagram of the third embodiment.

FIG. 7 is a schematic circuit diagram in still another embodiment of the present invention.

FIG. 8 is a schematic circuit diagram in still another embodiment of the present invention.

FIG. 9 is a schematic circuit diagram in still another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 20 cooling device 21 compressor 22 cooling fan 23 primary air-cooled condenser 24 water-cooled condenser 25 secondary air-cooled condenser 28 expansion valve 29 evaporator 30 cooling water line 31 automatic water supply valve 40 cooling fan 41 detector 50 bypass channel 51 electromagnetic On-off valve 52 Capillary tube 60 Heat exchange section 71 Hot gas path 72 Hot gas valve

Claims (1)

(57) [Claims] 1. A cooling system comprising an air-cooled refrigerant condenser and a water-cooled refrigerant condenser, wherein a temperature detector for the refrigerant or a refrigerant flowing out from the temperature-raising part of the cooling device; Cooling means, wherein the cooling means
The first cooling, which is a cooling fan installed close to the warm part
Means and a valve for allowing the refrigerant to bypass the evaporator of the cooling device.
Open / close valves installed in the bypass flow path and the bypass flow path
The air-cooled refrigerant.
The operation of the condenser stops, and the temperature detector sets the first set value.
When the above temperature is detected, the second cooling means operates.
And the second temperature detector is higher than the first set value.
A cooling device configured to operate the first cooling means when a temperature equal to or higher than a set value is detected .