JP2014190643A - Refrigerator-freezer unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator-freezer unit including a ventilator function to circulate the air stagnating on the upper surface of a prefabricated refrigerator-freezer and ensuring an effective ventilation function even if a compressor stops, without the need to newly install a ventilator.SOLUTION: A refrigerator-freezer unit comprises a refrigerant circuit in which a compressor compressing refrigerant, a condenser condensing high-pressure refrigerant gas from the compressor, a condenser blower blowing air to the condenser, an expansion valve expanding high-temperature, high-pressure liquid refrigerant from the condenser, and an evaporator evaporating low-temperature, low-pressure refrigerant from the expansion valve are sequentially connected by a refrigerant tube, and causes a refrigerator-freezer to perform cold storage or refrigeration. In a state in which the compressor and the condenser blower stop operating, the condenser blower that stops operating is driven if an outside temperature of the refrigerator-freezer is equal to or higher than an outside set temperature.

Description

  The present invention relates to a refrigeration unit, and more particularly to a cooling device for a prefabricated refrigerator-freezer.

  As a background art in this technical field, there is JP-A-2002-130750. In this technology, “In order to optimally operate the refrigeration cycle using indoor ventilation equipment inside the installed building, it has a function to communicate information necessary for determining ventilation operation from the refrigeration unit. The refrigeration cycle is in an optimal operating state. Thereby, it is trying to solve the overheating operation of the refrigeration unit.

JP 2002-130750 A

  The prefabricated refrigerator-freezer is cooled by a freezing / refrigeration unit. At this time, the heat in the prefabricated refrigerator-freezer is pumped up by the evaporator blower constituting the refrigerator-freezer unit, and is released to the outside of the prefabricated refrigerator-freezer through the condenser fan. Since the prefabricated refrigerator-freezer is installed in a building, the temperature in the building rises and becomes a temperature unsuitable for the operation of the refrigeration unit. Further, when the temperature in the prefabricated refrigerator-freezer becomes equal to or lower than the installation value, the compressor is stopped and the condenser blower is stopped. Therefore, the air on the upper surface of the prefabricated refrigerator-freezer is stagnated.

  As a result, the upper surface temperature of the prefabricated refrigerator-freezer remains elevated, and the refrigerator-freezer unit is easily damaged when the compressor is operated again. Further, the ambient air of the prefabricated refrigerator-freezer easily reaches the dew point temperature on the surface of the prefabricated refrigerator-freezer, and the surface of the prefabricated refrigerator-freezer is likely to generate dew. In order to prevent this, by ventilating with a ventilator, even when the compressor is stopped, the air on the top surface of the prefabricated refrigerator-freezer is circulated, so that overheating of the compressor and condensation of the prefabricated refrigerator-freezer are prevented. Although it was preventing, it was necessary to install another ventilation device.

  When installing a ventilator, the cost of processing the building, power supply wiring, and operating the ventilator will add to the electricity bill. Furthermore, in order to operate in conjunction with the refrigeration unit, it is necessary to connect signal wiring, which causes an increase in costs such as installation costs.

  Therefore, the present invention has a ventilator function for circulating stagnant air on the upper surface of the prefabricated refrigerator-freezer without newly installing a ventilator, and the ventilating function is effective even when the compressor is stopped. A freezing and refrigeration unit is provided.

In order to solve the above problems, the present invention provides a “compressor that compresses refrigerant,
A condenser for condensing the high-pressure refrigerant gas from the compressor;
A condenser fan for blowing air to the condenser;
An expansion valve for expanding the high-temperature and high-pressure liquid refrigerant from the condenser;
In a refrigerating / refrigeration unit for constituting a refrigerant circuit by sequentially connecting the evaporator for evaporating low-temperature and low-pressure refrigerant from the expansion valve with refrigerant piping, and performing refrigerating or freezing in a refrigerator-freezer,
In the state where the compressor and the condenser blower are stopped, the condenser blower that is stopped is driven when the temperature outside the refrigerator-freezer becomes equal to or higher than the outside set temperature ”. To do.

  ADVANTAGE OF THE INVENTION According to this invention, the stagnation of the air of the upper surface of a prefabricated refrigerator-freezer can be reduced, without adding a ventilator newly. That is, it is possible to provide a refrigeration unit that can suppress overheating operation of the refrigeration unit and condensation in the prefabricated refrigerator-freezer.

It is an example of the schematic diagram at the time of installing the freezing / refrigeration unit which is an Example of this invention. The front view and top view which enabled it to understand the internal structure of a freezer unit were shown. The structural example of the refrigerating cycle of a freezing / refrigeration unit is shown. It is the equipment installation figure of the conventional prefabricated refrigerator-freezer 1 and the freezer / refrigeration unit 2.

  Hereinafter, embodiments will be described with reference to the drawings.

  In this embodiment, an example of a refrigeration unit that can circulate the air on the upper surface of a prefabricated refrigerator-freezer by using a condenser blower having a ventilator function will be described.

  FIG. 1 is an equipment installation diagram of a prefabricated refrigerator-freezer and a refrigerator-freezer unit used in supermarkets and farmers. A freezer / refrigeration unit 2 is installed on the ceiling of the prefabricated refrigerator-freezer 1 to cool the inside of the prefabricated refrigerator-freezer generally from -25 ° C to + 20 ° C.

  FIG. 2 shows a front view and a top view in which a part of the freezer / refrigeration unit 2 is broken so that the internal structure can be understood. Reference numeral 2 denotes a housing of the refrigeration unit. The housing 2 is provided with an evaporator blower 3 and a condenser blower 4 that circulate the air in the prefabricated refrigerator-freezer 1 and components constituting a refrigeration cycle. . They are mainly provided with a compressor 5, a condenser 6, an expansion valve 7, an evaporator 8, an electromagnetic valve 9 for hot gas, and an electromagnetic valve 10 for injection.

  In addition, an internal temperature sensor 11 for detecting the temperature in the prefabricated refrigerator-freezer 1 is attached, and the operation value or the stop control of the compressor 5 to be described later is performed using the detection value of the internal temperature sensor 11. . Moreover, the outside temperature sensor 12 which detects the temperature outside the prefabricated refrigerator-freezer 1 is attached, and the condensation during the stop of the compressor 5 which will be described later is performed using the detected value of the outside temperature sensor 12. The operation or stop of the blower 4 is controlled.

  Further, the high pressure sensor 13 for detecting the operating pressure of the refrigeration cycle, the low pressure sensor 14, the discharge gas temperature sensor 15 for detecting the discharge gas temperature of the compressor 5, and the hot gas solenoid valve 9 are turned on / off. A defrosting temperature sensor 16 and an electric box 17 for control are provided.

  FIG. 3 shows a configuration example of the refrigeration cycle of the refrigeration unit 2. The components of the refrigeration unit 2 will be described in detail. The compressor 5 includes a compressor 5 that compresses the refrigerant, and a condenser 6 that condenses the high-pressure refrigerant gas from the compressor 5. The condenser 6 includes a condenser fan 4. As a result of air blowing, heat exchange between the high-pressure refrigerant gas and air is performed. A refrigerant circuit is configured by sequentially connecting an expansion valve 7 for expanding the high-temperature and high-pressure liquid refrigerant from the condenser 6 and an evaporator 8 for evaporating the low-temperature and low-pressure refrigerant from the expansion valve 7 through refrigerant piping. Yes.

  By branching the refrigerant pipe between the compressor 5 and the condenser 6 between the expansion valve 7 and the evaporator 8 by the bypass pipe 20 without passing through the condenser 6, the compressor, the hot gas solenoid valve, The defrosting circuit is configured by sequentially connecting the evaporator 8. In addition, liquid refrigerant is injected between the condenser 6 and the expansion valve 7 to the suction side of the compressor 5 by the injection pipe 21. That is, the condenser circuit, the injection electromagnetic valve 10, the capillary tube, and the compressor 5 are sequentially connected to form an injection circuit.

  The refrigeration cycle is configured by the above configuration, and the prefabricated refrigerator-freezer 1 is refrigerated or frozen. That is, the compressor 5, the expansion valve 7, the condenser blower 4, the evaporator blower 3, and the like are controlled so that the detected value of the internal temperature sensor 11 becomes the target set temperature.

  FIG. 4 is a device installation diagram of a conventional prefabricated refrigerator-freezer 1 and a refrigerator-freezer unit 2. The prefabricated refrigerator-freezer 1 is cooled by a refrigerator-freezer unit 2. At this time, the heat in the prefabricated refrigerator-freezer 1 is pumped up by the evaporator blower 3 constituting the refrigerator-freezer unit 2, and is released outside the prefabricated refrigerator-freezer 4 through the condenser blower 4. Since the prefabricated refrigerator-freezer 1 is installed in the building 18, the temperature in the building 18 rises and becomes a temperature unsuitable for operation of the refrigeration unit 2.

  Here, in the freezer / refrigeration unit 2 of the present embodiment, the compressor 5 is stopped when the temperature in the prefabricated refrigerator-freezer 1 is equal to or lower than the installation value, and the condenser blower 4 is stopped, thereby obtaining a power saving effect. It is. At this time, since the condenser blower 4 is stopped, the air on the upper surface of the prefabricated refrigerator-freezer 1 stagnates. Thereby, the upper surface temperature of the prefabricated refrigerator-freezer 1 remains elevated, and the refrigerator-freezer unit 2 is easily damaged when the compressor 5 is operated again. Furthermore, the ambient air around the prefabricated refrigerator-freezer 1 tends to reach the dew point temperature on the surface of the prefabricated refrigerator-freezer 1, and there is a problem that condensation tends to occur on the surface of the prefabricated refrigerator-freezer 1.

  In order to prevent this, the air in the upper surface of the prefabricated refrigerator-freezer 1 is circulated even when the compressor 5 is stopped by ventilating with the ventilator 19, so that the compressor 5 is overheated or prefabricated. Although condensation of the refrigerator 1 is prevented, a separate installation of the ventilator 19 is necessary. When installing the ventilation device 19, making a hole in the building 18 or operating the power supply wiring or the ventilation device 19 at all times is expensive. Furthermore, in order to operate in conjunction with the refrigeration unit 2, it is necessary to connect signal wiring, which causes an increase in costs such as installation work costs.

  In the present embodiment, the outside temperature sensor that detects the air temperature on the upper surface of the prefabricated refrigerator-freezer 1 even when the compressor 5 is stopped due to the detected value of the inside temperature sensor 11 being lower than the set temperature. When the detected value of 12 becomes equal to or higher than the set temperature, the condenser blower 4 is driven to circulate the air outside the prefabricated refrigerator-freezer 1. This makes it possible to circulate the air on the top surface of the prefabricated refrigerator-freezer 1 without installing the ventilator 19 of FIG. 4, and to make the environment more suitable for operation when the compressor 5 is operated again. It becomes possible. Moreover, it becomes possible to suppress the dew condensation of the prefabricated refrigerator-freezer 1 while the compressor 5 is stopped.

  Thereby, in order to operate in conjunction with the refrigerating / refrigeration unit 2, the processing cost for the building 18 required for installing the ventilator 19, the electricity charge added to operate the power supply wiring and the ventilator 19, and further This eliminates the need for installation work such as signal wiring and reduces the cost. In addition, the apparatus which judges the operation stop of the condenser blower 4 may be detected by the high pressure sensor 13. That is, when the compressor 5 and the condenser blower 4 are stopped due to a drop in the internal temperature, the condenser blower 4 is operated when the detected value of the high pressure sensor 13 becomes higher than the set value. This makes it possible to reduce the load at the start of operation of the compressor 5 and reduce condensation on the prefabricated refrigerator-freezer 1 while achieving energy saving while circulating air outside the warehouse.

  As described above, the refrigerator-freezer unit of the present embodiment includes the internal temperature sensor 11 that detects the internal temperature of the refrigerator-freezer (prefabricated refrigerator-freezer 1), and the temperature detected by the internal temperature sensor 11 is the internal temperature. When the temperature is lower than the set temperature, the compressor 5 and the condenser fan 4 are stopped. It is desirable that the rotational speed of the condenser blower 4 when the condenser blower 4 is driven while the compressor 5 is stopped be substantially the same as the minimum rotational speed of the condenser blower 4 when the compressor 5 is in operation. That is, it is sufficient to circulate the air outside the warehouse at the minimum number of revolutions, and this enables power saving.

  Further, when the temperature outside the refrigerator-freezer (prefabricated refrigerator-freezer 1) detected by the outside-temperature sensor 12 becomes equal to or higher than the outside-set temperature, the condenser blower 4 stopped as described above is driven. . In this case, when the temperature detected by the internal temperature sensor 11 becomes equal to or higher than the internal set temperature, the stopped compressor 5 starts operation and the condenser blower 4 continues operation.

1: Prefabricated refrigerator-freezer 2: Refrigerated refrigerator unit 3: Blower for evaporator 4: Blower for condenser 5: Compressor 6: Condenser 7: Expansion valve 8: Evaporator 9: Solenoid valve for hot gas 10: Solenoid valve for injection 11: Inside temperature sensor 12: Outside temperature sensor 13: High pressure sensor 14: Low pressure sensor 15: Discharge gas temperature sensor 16: Defrosting temperature sensor 17: Electric box 18: Building 19: Ventilator 20: Bypass Pipe 21: Pipe for injection

Claims (4)

A compressor for compressing the refrigerant;
A condenser for condensing the high-pressure refrigerant gas from the compressor;
A condenser fan for blowing air to the condenser;
An expansion valve for expanding the high-temperature and high-pressure liquid refrigerant from the condenser;
In a refrigerating / refrigeration unit for constituting a refrigerant circuit by sequentially connecting the evaporator for evaporating low-temperature and low-pressure refrigerant from the expansion valve with refrigerant piping, and performing refrigerating or freezing in a refrigerator-freezer,
In a state where the compressor and the condenser blower are stopped, the condenser blower that is stopped is driven when the temperature outside the refrigerator-freezer is equal to or higher than a set temperature outside the refrigerator. Refrigeration unit.   2. The compressor and the condenser blower according to claim 1, further comprising an internal temperature sensor that detects an internal temperature of the refrigerator-freezer, wherein the temperature detected by the internal temperature sensor is equal to or lower than the internal set temperature. The refrigeration unit characterized by stopping.   2. The rotation speed of the condenser blower when the compressor blower is driven while the compressor is stopped is substantially the same as the minimum rotation speed of the condenser blower during operation of the compressor. A refrigeration unit characterized by that.   3. The temperature detected by the internal temperature sensor is the internal set temperature when the condenser blower that is stopped when the temperature outside the refrigerator is equal to or higher than the external set temperature is driven. When it becomes above, the said compressor which is stopped starts operation | movement, and the said air blower for condensers continues operation | movement, The refrigeration unit characterized by the above-mentioned.