JP2699764B2 - Integrated refrigeration system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated refrigeration apparatus which is mounted on the top of a refrigerator provided in a building such as a warehouse.

[0002]

2. Description of the Related Art Conventionally, an integrated refrigeration system is often used by being installed on the top surface of a refrigerator provided in a building such as a warehouse. Such an integrated refrigeration system is disclosed, for example, in Japanese Utility Model Laid-Open No. 60-176079. In the integrated refrigeration system, a compressor and a condenser are arranged outside the refrigerator, and an expansion valve and an evaporator are arranged inside the refrigerator. In the evaporator, the refrigerant evaporates and removes heat from the air in the refrigerator. This heat is released outside the refrigerator when the refrigerant condenses in the condenser.

A building in which an integrated refrigeration system is installed is generally provided with a ventilation fan. Since the integrated refrigeration system discharges heat into the building, the temperature of the air around the integrated refrigeration system rises and heat is stored. Particularly in summer when the temperature is high, the frequency of refrigeration operation increases, and the amount of exhaust heat increases, so that heat is easily stored. As the temperature around the condenser increases, the efficiency of heat release from the condenser decreases. For this reason, the load on the compressor increases, and the compressor is likely to be overloaded. The ventilation fan is provided to discharge the air around the integrated refrigeration system to the outside of the building to prevent the accumulation of heat.

[0004]

A conventional integrated refrigeration system requires a ventilation fan for exhaust heat when installed in a building. However, the ventilation fan is operated and driven separately from the integrated refrigerator. For this reason, for example, in a summer or the like, the ventilation fan is always turned on. However,
When the refrigeration circuit of the integrated refrigeration system is not operating,
Since no heat is released from the condenser, turning on the ventilation fan has no effect. On the contrary, electric energy for turning the ventilation fan is wasted.

It is an object of the present invention to provide an energy-saving integrated refrigeration apparatus that drives a ventilation fan only when necessary.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an integrated refrigeration apparatus provided in a building 1 provided with a ventilation fan 5 for exhaust air and comprising a compressor 6, a condenser 7 and an evaporator 8.
Detecting means 11, 14, for detecting an overload state of the refrigeration system;
15 and a control means 13 for driving the ventilation fan 5 when the refrigerating apparatus is overloaded in response to outputs from the detecting means 11, 14, and 15. .

Further, according to the present invention, when the detecting means 11 detects that the pressure on the suction side of the compressor 6 becomes higher than a predetermined pressure,
It is characterized in that it is detected as an overload state.

Further, the present invention is characterized in that when the detecting means 14 detects that the pressure on the discharge side of the compressor 6 is equal to or higher than a predetermined pressure,
It is characterized in that it is detected as an overload state.

Further, the present invention is characterized in that the detecting means 15 detects an overload state when the suction temperature of the condenser 7 becomes higher than a predetermined temperature.

The present invention also relates to an integrated refrigeration system which is provided in a building 1 provided with a ventilation fan 5 for exhaust gas and includes a compressor 6, a condenser 7 and an evaporator 8, which are linked when the compressor 6 is operated. Interlocking means 30 for driving ventilation fan 5
An integrated refrigeration apparatus characterized by including:

The present invention also relates to an integrated refrigeration system which is provided in a building 1 provided with a ventilation fan 5 for exhaust and includes a compressor 6, a condenser 7 and an evaporator 8, which operates in conjunction with the operation of the compressor 6. Outlet 2 for driving ventilation fan 5
8 is an integrated refrigerator.

[0012]

According to the present invention, the integrated refrigeration apparatus provided in the building 1 provided with the exhaust fan 5 for exhaust includes detection means 11, 14, 15 and control means 13. Since the integrated refrigeration apparatus is provided in the building 1, if the refrigeration operation is continued, the temperature of the surrounding air is increased by the exhaust heat from the condenser 7. As the temperature around the condenser 7 increases, the capacity of the condenser 7 decreases. In order to reliably condense the refrigerant in such a state, the load on the compressor 6 increases, leading to an overload state. The control means 13 includes detection means 11, 14, 1
When 5 detects an overload state, it drives the ventilation fan 5. The air around the condenser 7 is discharged outside the building 1 and
No heat is stored around the refrigeration system, and the overload state of the refrigeration system is eliminated. In this way, since the ventilation fan 5 is driven when the refrigerating device is in an overload state, it is driven when necessary and energy can be saved.

Further, according to the present invention, when the pressure on the suction side of the compressor 6 becomes equal to or higher than a predetermined pressure, the detecting means 11 detects that the refrigerating apparatus is overloaded. In the overload state of the compressor 6, the pressure on the suction side rises remarkably, so that the overload state can be easily detected.

Further, according to the present invention, when the pressure on the discharge side of the compressor 6 becomes equal to or higher than a predetermined pressure, the detecting means 14 detects that the refrigerating apparatus is overloaded. Since the compressor 6 enters the overload state when the pressure of the refrigerant discharged from the compressor 6 increases, it is easy to detect the overload state.

Further, according to the present invention, when the suction temperature of the condenser 7 becomes equal to or higher than a predetermined temperature, the detecting means 15 detects that the refrigerating apparatus is overloaded. Since the suction temperature of the condenser 7 reflects the temperature of the surrounding air, it is possible to easily detect an overload state due to heat buildup.

According to the present invention, the ventilation fan 5 is driven by the interlocking means 30 when the compressor 6 is operating. Condenser 7
Is discharged into the building 1 when the compressor 6 is operated and the refrigerant is condensed in the condenser 7. At this time, since the interlocking means 30 drives the ventilation fan 5 in conjunction with it, the heat discharged from the condenser 7 can be further discharged outside the building 1.

As described above, since the ventilation fan 5 is driven only when the heat is discharged from the condenser 7, heat is not stored around the condenser 7, and the refrigeration system can be operated with high efficiency. On the other hand, when the compressor 6 stops, the ventilation fan 5 also stops, so that energy can be saved.

According to the present invention, an outlet 28 for driving the ventilation fan 5 in conjunction with the operation of the compressor 6 is provided. If the ventilation fan 5 is connected to the outlet 28, it is possible to easily drive the ventilation fan 5 only when the compressor 6 is operating. Since the ventilation fan 6 is not driven when the compressor 5 is stopped, energy can be saved.

[0019]

FIG. 1 shows a schematic configuration when an integrated refrigeration apparatus according to an embodiment of the present invention is used. In a building 1 such as a warehouse, an integrated refrigeration unit 2 which is an integrated refrigeration apparatus is provided. The integrated refrigeration unit 2 is installed on the top surface of a prefabricated refrigerator 3 assembled in the building 1. Electric power is supplied from the power supply 4 to the integrated refrigeration unit 2. The air in the building 1 is discharged to the outside of the building 1 by the ventilation fan 5.

The integrated refrigeration unit 2 is divided into an outer side and an inner side of the prefabricated refrigerator 3 by a heat insulating material. Among the main elements constituting the refrigeration circuit, the compressor 6 and the condenser 7 are provided on the outside, and the evaporator 8 is provided on the inside. By the refrigerant circulated by the compressor 6,
The air in the prefabricated refrigerator 3 is cooled by the evaporator 8. Heat absorbed by the evaporator 8 when cooling the air in the prefabricated refrigerator 3 is discharged from the condenser 7 into the building 1. In order to efficiently discharge heat from the condenser 7 into the building 1, a fan 9 is provided to circulate the air in the building 1.

In summer or the like when the surrounding temperature is high, even if the air is circulated by the fan 9, the temperature of the air in the building 1 is high, so that the heat is easily stored. When the temperature of the air around the condenser 7 rises and heat is stored, the discharge pressure of the compressor 6 increases, and the pressure on the suction side of the compressor 6 also increases. In such a state, the load on the compressor 6 is large, and the compressor 6 is likely to be overloaded. The ventilation fan 5 is driven when the integrated refrigeration unit 2 is overloaded, and discharges the air heated in the building 1 to the outside to prevent the accumulation of heat. As a result, the overload state of the integrated refrigeration unit 2 is eliminated, so that the safety device does not operate and the normal operation state can be continued. When the overload state of the integrated refrigeration unit 2 is eliminated, the drive of the ventilation fan 5 is stopped. That is,
The ventilation fan 5 is driven only when the exhaust heat is required, and energy can be saved.

FIG. 2 shows a refrigerant piping system of the integrated refrigeration unit 2 shown in FIG. Corresponding parts in the configuration shown in FIG. 1 are denoted by the same reference numerals. The high-pressure gas refrigerant discharged from the compressor 6 is condensed in the condenser 7 to become a liquid refrigerant. The liquid refrigerant adiabatically expands when passing through the expansion valve 10, evaporates in the evaporator 8, and is sucked into the compressor 6.

A low-pressure switch (hereinafter abbreviated as “LPS”) 11 is provided for detecting an overload state from the pressure on the suction side of the compressor 6. The output of the LPS 11 is supplied via a detection line 12 to a control circuit 13 as control means. The control circuit 13 drives the ventilation fan 5 when the pressure detected by the LPS 11 exceeds a set value. The detection of overload of the refrigeration system is performed not only by the low pressure on the suction side of the compressor 6 as described above, but also by connecting a high-pressure switch (hereinafter abbreviated as “HPS”) 14 to the discharge side of the compressor 6. It goes without saying that the control circuit 13 may detect that the output is equal to or higher than the set value and drive the ventilation fan 5. Further, it is a matter of course that the suction temperature of the condenser 7 may be detected by the temperature detector 15 and the control circuit 13 may drive the ventilation fan 5 based on the output.

FIG. 3 shows a part of the electrical configuration of the integrated refrigeration unit 2 in the embodiment shown in FIG. The temperature detector contact 20 of the temperature detector 15 shown in FIG.
One LPS contact 21 is connected in parallel. The output of the parallel circuit is connected in series to a relay coil 22 of a relay constituting the control circuit 13. The temperature detector contact 20 is turned on when the suction temperature of the condenser 7 detected by the temperature detector 15 exceeds a set value. The LPS contact 21 of the LPS 11 is L
It shuts off when the low pressure detected by PS11 is less than the set value. Therefore, the LPS contact 21 conducts when the detected low pressure is equal to or higher than the set value. The relay coil 22 is driven when at least one of the temperature detector contact 20 and the LPS contact 21 is conductive. Relay coil 2
When the relay 2 is driven, the relay contact 23 is turned on, and the motor of the ventilation fan 5 is energized.

FIG. 4 shows a schematic electric configuration of an integrated refrigeration apparatus according to another embodiment of the present invention. Parts corresponding to the embodiment shown in FIG. 1 are denoted by the same reference numerals. It should be noted that the temperature controller 24 for controlling the temperature of the integrated refrigeration system.
Can be driven in conjunction with the ventilation fan 5. Temperature controller 24
The temperature controller contact 25 detects the temperature inside the prefabricated refrigerator 3 shown in FIG. 1, and switches to the H side when the temperature is lower than the set temperature and to the L side when the temperature is higher than the set value. Temperature controller contact 25 is L
When switched to the side, the relay coil 26 is excited.
When the relay coil 26 is excited, the relay contact 27 is turned on, and power is supplied from the power supply 4 to the compressor 6. The output from the relay contact 27 branches out to the outlet 28 and is taken out. In the outlet 28, the plug 2 of the ventilation fan 5
9 can be inserted and connected. When the plug 29 is connected to the outlet 28, the ventilation fan 5 can be driven in conjunction with the compressor 6. When unnecessary, for example, when the outside air temperature is low and the ventilation fan 5 does not need to be driven, if the plug 29 is pulled out of the outlet 28, the ventilation fan 5 will not be driven in conjunction with the compressor 6 and energy saving will be achieved. Can be achieved.

FIG. 5 shows a schematic electrical configuration according to still another embodiment of the present invention. This embodiment is similar to the embodiment shown in FIG. 4 and is shown more simplified than the embodiment shown in FIG. Parts corresponding to the embodiment shown in FIG. 4 are denoted by the same reference numerals. It should be noted that the output from the relay contact 27 is connected to the ventilation fan 5 by a local wiring line 30 which is an interlocking means. Since the ventilation fan 5 is connected by the local wiring line 30 in this manner, the ventilation fan 5 can be reliably driven in conjunction with the compressor 6.

In each of the above embodiments, the integrated refrigeration unit 2, which is an integrated refrigeration unit, is installed in the prefabricated refrigerator 3. However, the integrated refrigeration unit may be used for other purposes such as spot coolers and for taking out cold air. Of course, it may be used.

[0028]

As described above, according to the present invention, the control means 13 drives the ventilation fan 5 when the detecting means 11, 14, 15 detects an overload state of the refrigerating apparatus, so that the control means 13 can be operated only when necessary. The ventilation fan 5 can be driven, and energy can be saved. Further, since the ventilation fan 5 is driven in the overload state, the overload state is eliminated, and the normal operation of the refrigerating apparatus can be continued.

Further, according to the present invention, when the pressure on the suction side of the compressor 6 becomes equal to or higher than a predetermined pressure, it is detected as an overload state, so that the overload state can be easily and reliably detected. Only when the ventilation fan 5 is not needed, the ventilation fan 5 is not driven and energy saving can be achieved.

Further, according to the present invention, when the pressure on the discharge side of the compressor 6 becomes equal to or higher than a predetermined pressure, it is detected as an overload state of the refrigerating apparatus, so that the overload state can be reliably detected. The energy can be saved by driving the ventilation fan 5 only when necessary.

Further, according to the present invention, when the suction temperature of the condenser 7 becomes equal to or higher than a predetermined temperature, it is detected as an overload state of the refrigerating apparatus, so that the overload state can be reliably detected. Only the ventilation fan 5 can be driven to save energy.

Further, according to the present invention, since the ventilation fan 5 is driven in conjunction with the operation of the compressor 6 by the interlocking means 30, heat is not stored around the condenser 7 and the refrigeration operation can be performed efficiently. it can. Since the ventilation fan 5 is not driven when the compressor 6 is stopped, energy can be saved.

Further, according to the present invention, the ventilation fan 5 is connected to the outlet 28, and the ventilation fan 5
Can be easily driven. Even when the compressor 6 is operating, if the outside air temperature is low, the ventilation fan 5
Need not be driven, further energy saving can be achieved by removing the connection from the outlet 28 to the ventilation fan.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of one embodiment of the present invention.

FIG. 2 is a piping system diagram of the integrated refrigeration unit 2 shown in FIG.

FIG. 3 is a block diagram showing a partial electric configuration of the integrated refrigeration unit 2 shown in FIG. 1;

FIG. 4 is a block diagram showing a schematic electrical configuration of another embodiment of the present invention.

FIG. 5 is a block diagram showing a schematic electrical configuration of still another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Building 2 Integrated refrigeration unit 3 Prefab refrigerator 4 Power supply 5 Ventilation fan 6 Compressor 7 Condenser 8 Evaporator 9 Fan 10 Expansion valve 11 LPS 13 Control circuit 14 HPS 15 Temperature detector 28 Outlet 29 Plug 30 Field wiring line

Claims (6)

(57) [Claims] 1. An integrated refrigeration apparatus provided in a building 1 provided with a ventilation fan 5 for exhaust air and comprising a compressor 6, a condenser 7 and an evaporator 8, detecting means for detecting an overload state of the refrigeration apparatus. 11,14,
An integrated refrigerating apparatus comprising: a control unit for driving the ventilation fan when the refrigerating apparatus is overloaded in response to an output from the detecting unit. 2. The integrated refrigeration system according to claim 1, wherein said detection means detects an overload state when the pressure on the suction side of the compressor is equal to or higher than a predetermined pressure. 3. The integrated refrigeration system according to claim 1, wherein said detection means detects an overload state when the pressure on the discharge side of the compressor is equal to or higher than a predetermined pressure. 4. The integrated refrigeration system according to claim 1, wherein said detection means detects an overload state when the suction temperature of the condenser becomes equal to or higher than a predetermined temperature. 5. An integrated refrigeration system provided in a building 1 provided with a ventilation fan 5 for exhaust air and comprising a compressor 6, a condenser 7 and an evaporator 8, wherein the ventilation fan 5 is operated in conjunction with the operation of the compressor 6. An integrated refrigeration apparatus, comprising interlocking means 30 for driving the refrigeration system. 6. An integrated refrigeration system provided in a building 1 provided with a ventilation fan 5 for exhaust air and comprising a compressor 6, a condenser 7 and an evaporator 8, wherein the ventilation fan 5 is operated in conjunction with the operation of the compressor 6. An integrated refrigeration apparatus comprising an outlet 28 for driving the refrigeration system.