JP2004116863A - Refrigeration storage shed - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigeration storage shed for restraining the occurrence of a temperature rise and uneven temperature in a storage room during the stop of a compressor to the utmost. <P>SOLUTION: This refrigeration storage shed includes: a storage room temperature detecting means for detecting the temperature in the storage room; and control devices 36, 37 or controlling a refrigerant circulation control means and a blower according to the temperature detected by the storage room temperature detecting means and the preset temperature in the storage room. The control devices on-off control the refrigerant circulation control means, operates the blower when the refrigerant circulation control means is in the on-state, and repeat the control for the blower intermittent operation in which the blower is stopped during designated time after the refrigerant circulation control means is turned off and then the blower is operated during designated time in the case where the refrigerant circulation control means is in the off state. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a cooling storage for cooling a storage room.
[0002]
[Prior art]
Conventionally, refrigerators and refrigerators for this type of business, such as refrigerators and freezers, are installed in kitchens of restaurants, stores of supermarkets, and the like, and a refrigerant circuit is configured by a compressor, a condenser, a decompression device, a cooler, and the like. A cooling unit is provided, and cool air that has exchanged heat with a cooler is circulated into a storage room by a blower to cool and store food at a set temperature. In some cases, a cooling unit other than the cooler and the blower is separately provided, and the supply of the refrigerant to the cooler is controlled by an electromagnetic valve.
[0003]
Such control of the cooling storage is performed based on the temperature of the storage room by a control device conventionally constituted by a microcomputer. That is, an upper limit temperature and a lower limit temperature are set above and below the set temperature of the storage room, the compressor is operated when the temperature of the storage room rises to the upper limit temperature, and stopped when the temperature of the storage room falls to the lower limit temperature, so-called ON-OFF. Perform control. In addition, the cool air that has exchanged heat with the cooler is circulated into the storage chamber by a blower. In such a case, the blower is normally operated continuously (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 2999424 [0005]
[Problems to be solved by the invention]
However, if the blower is operated even while the compressor is stopped, heat is generated with the operation of the blower, and the storage chamber is heated (heat generation of the motor). In addition, the heat that has entered from the heat insulating door that opens and closes the storage room spreads over the entire storage room while the compressor is stopped due to the operation of the blower. For these reasons, there has been a problem that operating the blower while the compressor is stopped promotes a temperature rise in the storage room.
[0006]
On the other hand, if the blower is stopped while the compressor is stopped, the temperature unevenness in the storage chamber becomes too strong, which is not preferable.
[0007]
The present invention has been made to solve such a conventional technical problem, and it is an object of the present invention to provide a cooling storage that can minimize a rise in the temperature of a storage chamber and the occurrence of temperature unevenness during a stop of a compressor. Aim.
[0008]
[Means for Solving the Problems]
The cooling storage of the present invention comprises a cooler, a refrigerant circulation control means for controlling the circulation of the refrigerant to the cooler, and a blower for circulating the cool air exchanged with the cooler into the storage room. A storage chamber temperature detecting means for detecting the temperature in the storage chamber, and a control device for controlling the refrigerant circulation control means and the blower based on the temperature detected by the storage chamber temperature detecting means and the set temperature in the storage chamber. The control device performs ON-OFF control of the refrigerant circulation control means, and operates the blower when the refrigerant circulation control means is ON, and operates the blower when the refrigerant circulation control means is OFF. The intermittent operation control of the blower for stopping the blower for a predetermined time after the refrigerant circulation control unit is turned off and thereafter operating the blower for a predetermined time is repeated.
[0009]
According to the present invention, in a cooling storage including a cooler, a refrigerant circulation control unit that controls circulation of the refrigerant to the cooler, and a blower that circulates cool air that has exchanged heat with the cooler in the storage room, A storage room temperature detection unit that detects the temperature in the storage room, and a control device that controls the refrigerant circulation control unit and the blower based on the temperature detected by the storage room temperature detection unit and the set temperature in the storage room, This control device controls the refrigerant circulation control means to ON-OFF, operates the blower when the refrigerant circulation control means is ON, and operates the refrigerant circulation when the refrigerant circulation control means is OFF. Since the blower is stopped for a predetermined time after the control means is turned off, and then the blower intermittent operation control for operating the blower for a predetermined time is repeated, a case where the refrigerant circulation control means is turned off. While suppressing the occurrence of temperature unevenness Kura chamber is also promoted in the temperature rise inside the storage compartment due to the operation of the blower as it can be suppressed as much as possible.
[0010]
In the cooling storage according to the second aspect of the invention, the control device can selectively execute the intermittent operation control of the blower and the control for continuously operating the blower regardless of the ON-OFF control of the refrigerant circulation control means. Things.
[0011]
According to the invention of claim 2, in addition to the above, the control device can selectively execute the intermittent operation control of the blower and the control for continuously operating the blower regardless of the ON-OFF control of the refrigerant circulation control means. Therefore, it is possible to switch between the intermittent operation and the continuous operation of the blower in accordance with the use condition of the cooling storage, which is very convenient.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view of a cooling storage 1 to which the present invention is applied, FIG. 2 is a plan view of the cooling storage 1, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is a sectional view taken along line BB of FIG. It is.
[0013]
The cooling storage 1 of the embodiment is, for example, a so-called pass-through type commercial refrigerator which is installed in a restaurant kitchen or the like and is opened before and after. It comprises an insulating box 6 composed of an inner box 3 incorporated at an interval and a foam insulating material 4 such as polyurethane foam. The front and rear openings of the heat-insulating box 6 are closed by heat-insulating doors 7 and 8 so as to be freely opened and closed.
[0014]
A suction port 12 and a discharge port 13 are formed at the center of the top wall 6A of the heat-insulating box 6 at the front and rear, and an auxiliary heat insulating material 14 is attached so as to cover the suction port 12 and the discharge port 13 from above. A cooling chamber 16 is formed in the heat insulating material 14. The cooling chamber 16 communicates with a storage chamber 18 formed in the heat insulating box 6 at each of the ports 12 and 13, and a cooler 19 forming a refrigerant circuit of a cooling unit is arranged in the cooling chamber 16. The blower 21 is attached to the suction port 12. A defrost heater (electric heater) 47 is attached to the cooler 19.
[0015]
A compressor (refrigerant circulation control means) 31, a condenser 32, and a blower 33 for the condenser, which also constitute a refrigerant circuit of the cooling unit, are installed on the ceiling wall 6 </ b> A on the left side of the auxiliary heat insulating material 14. The front and rear portions on the wall 6A are concealed by panels 23 and 24. The condenser 32 is disposed immediately after the front panel 23, followed by a condenser blower 33, and the compressor 31 is disposed behind the condenser blower 33.
[0016]
Reference numeral 36 denotes a slave control device provided on the top wall 6A near the condenser 32 and the compressor 31, and 37 denotes a main control device attached to the front panel 23, which enables data communication as described later. It is connected. Reference numerals 38... Indicate a plurality of shelves provided on columns 39 in the storage room 18.
[0017]
Further, an opening 41 penetrating therethrough is formed on the side from which the cool air is blown out from the cooler 19, that is, on the left side wall of the auxiliary heat insulating material 14 on the cool air discharge side of the blower 21. One end of a resin or rubber pipe 42 having a low thermal conductivity for forming the communication part is connected in communication. The pipe 42 extends from the auxiliary heat insulating material 14 to the front after going forward, and extends to the left. The other end opening 43 is bent backward and directed to the discharge pipe 31D (discharge side) of the compressor 31. ing.
[0018]
Further, a valve 46 is provided in the middle of the pipe 42. The valve 46 can manually adjust the cross-sectional area of the passage.
[0019]
When the compressor 31 and the blower 21 are operated, the refrigerant is circulated to the cooler 19 via a pressure reducing device (not shown), and evaporates there to exhibit a cooling function. The cool air in the cooling chamber 16 that has been cooled by heat exchange with the cooler 19 is blown out from the cooler 19 to the right in FIG. 3 by the blower 21, and then discharged into the storage chamber 18 through the discharge port 13. After being circulated through the inside and cooled as shown by the arrow in FIG. 3, the air is sucked from the suction port 12 and returned to the cooling chamber 16. The inside of the storage room 18 is cooled by such cool air circulation.
[0020]
Further, the condenser blower 33 is also operated, and the outside air is sucked from the lower side of the front panel 23 as shown by an arrow in FIG. Then, after the condenser 32 is air-cooled, it is also blown to the rear compressor 31, and after being air-cooled, flows out from the lower side of the rear panel 24.
[0021]
Next, FIG. 5 shows a schematic block diagram of an electric circuit of the cooling storage 1. The main controller 37 comprises a display board 51 provided in a control box. The display board 51 has a general-purpose microcomputer 52 and a display (display means) 53 comprising LEDs, not shown. An input switch (input means) and the like are attached. The display 53 and the input switch are connected to the microcomputer 52.
[0022]
On the other hand, the slave control device 36 is constituted by an I / O board 54 disposed in an electrical box. The I / O board 54 has a general-purpose microcomputer 56 and a thermistor for detecting the temperature of the storage room 18. And a cooler temperature sensor (cooler temperature detecting means) 58 composed of a thermistor for detecting the temperature of the cooler 19, and a sensor for the compressor 31 and the condenser. A plurality of relays 59 for controlling power supply to the blower 33, the blower 21 and the defrost heater 47 are provided. The storage room temperature sensor 57, the cooler temperature sensor 58, and the relays 59 are connected to the microcomputer 56.
[0023]
The slave controller 36 in the embodiment is for refrigeration, but has the same configuration for refrigeration. The default setting values, which will be described later, are different between the refrigeration use and the freezing use, and the setting is switched by, for example, cutting a jumper wire or the like. Thereby, the versatility of components is improved. The main controller 37 is set for refrigeration or freezing by the input switch (such as a dip switch). In the embodiment, it is assumed that it is set for refrigeration.
[0024]
The microcomputers 52 and 56 of the master controller 37 and the slave controller 36 are connected by a single communication line 61, and the microcomputers 52 and 56 can perform data communication via the communication line 61. . The current used for data communication using the communication line 61 is, for example, 10 mA.
[0025]
The control operation of the cooling controller 1 by the main controller 37 and the slave controller 36 with the above configuration will be described with reference to FIGS. The set temperature of the storage room 18 (for example, + 5 ° C., which can be arbitrarily set within a range of + 10 ° C. to + 3 ° C. in the embodiment) is input to the microcomputer 52 of the main controller 37 by the input switch as set temperature data. It is assumed that Similarly, the microcomputer 52 can arbitrarily set the defrosting end temperature and the defrosting cycle of the cooler 19 within a certain range, and are set by these input switches.
[0026]
FIG. 6 is a flowchart of the control of the microcomputer 52 of the main controller 37. After the power is turned on, the microcomputer 52 checks the communication state with the microcomputer 54 of the slave controller 36 in step S1. If communication is not possible due to any cause such as disconnection or poor connection of the communication line 61, a predetermined alarm is displayed on the display 53 in step S8.
[0027]
If communication is possible, the process proceeds to step S2, and the setting state (for refrigeration / freezing) of the slave control device 36 is checked. Since the cooling storage 1 of the embodiment is a refrigerator, if the slave control device 36 set for freezing is attached by mistake, the process proceeds to step S9, where a predetermined alarm is displayed on the display 53.
[0028]
Next, if the slave control device 36 is for refrigeration, the process proceeds to step S3, and it is determined whether storage room temperature data has been received from the microcomputer 56 of the slave control device 36. The storage room temperature data is data relating to the temperature of the storage room 18. If the data has been received, the process proceeds to step S4, where the set temperature data and the storage room temperature data of the storage room 18 inputted by the input switch are inputted. To calculate cooling control data.
[0029]
The cooling control data in this case will be described later in detail. Then, the microcomputer 52 of the main controller 37 transmits the calculated cooling control data and the set temperature data to the microcomputer 56 of the slave controller 36 via the communication line in step S5. In step S6, it is determined whether or not the cooler temperature data has been received from the microcomputer 56 of the slave control device 36. If so, the process proceeds to step S7 to defrost control data based on the cooler temperature data. This is transmitted to the slave controller 36. The defrost control data in this case will also be described later in detail.
[0030]
7 to 9 show flowcharts of the control of the microcomputer 56 of the slave control device 36. In FIG. 7, after the power is turned on, the microcomputer 56 checks the storage room temperature sensor 57. When the storage room temperature sensor 57 normally detects the temperature of the storage room 18, the process proceeds to step S15, and the cooler temperature sensor 58 is checked. If the cooler temperature sensor 58 has normally detected the temperature of the cooler 19, the process proceeds to step S16, and the state of communication with the microcomputer 52 of the main controller 37 is checked.
[0031]
(1) Operation when communication is normal and each sensor is normal When communication is possible, the process proceeds to step S20, where storage room temperature data relating to the temperature of the storage room 18 detected by the storage room temperature sensor 57 and the cooler temperature sensor 58 are displayed. The cooler temperature data relating to the detected temperature of the cooler 19 is transmitted to the microcomputer 52 of the main controller 37.
[0032]
Next, in step S21, the set temperature data received from the main controller 37 is stored in the memory, and the cooling control and the defrost control are executed based on the received cooling control data and defrost control data.
[0033]
Here, the cooling control in step S21 when the storage room temperature sensor 57 is normal will be described with reference to FIG. In step S4 of FIG. 6, the microcomputer 52 of the main controller 37 sets the upper limit temperature (for example, + 7 ° C.) above and below the set temperature (+ 5 ° C. described above) of the storage room 18 based on the set temperature data set by the input switch. ) And the lower limit temperature (for example, + 3 ° C.). Then, based on the storage room temperature data transmitted from the microcomputer 56 of the slave control device 36, when the temperature of the storage room 18 reaches the upper limit temperature, the cooling control data for turning on (operating) the compressor 31 is calculated. When the temperature of the storage room 18 has reached the lower limit temperature, cooling control data for turning off (stopping) the compressor 31 is calculated.
[0034]
The blower 21 is turned on (operated) when the compressor 31 is turned on, but the blower 21 is operated intermittently every predetermined time (for example, 3 minutes) while the compressor 31 is turned off (intermittent operation of the blower 21). Control) is calculated.
[0035]
The microcomputer 56 of the slave control device 36 receives the cooling control data and controls the compressor 31 to be turned on and off in step S21. Thereby, the inside of the storage room 18 is maintained at the set temperature on average. Further, with the stop of the compressor 31, the blower 21 also stops at the same time, starts the blower 21 after a predetermined time (3 minutes), operates for 3 minutes, and stops again for 3 minutes (may be a time different from the operation time). I do. By repeating this, the blower 21 is operated intermittently while the compressor 31 is stopped (intermittent operation control of the blower shown in the second stage from the bottom in FIG. 10. When the fan 31 is operated, the blower 21 is operated, and the blower 21 is also stopped during defrosting, which will be described later.
[0036]
Thereby, while suppressing the temperature rise of the storage room 18 during the stop of the compressor 31 due to the heat generation of the blower 21 (heat generation from the motor), the temperature unevenness generated in the storage room 18 can be minimized. Become. In addition, since heat leaks from the front and rear heat insulating doors 7 and 8 in the storage room 18, the temperature rise in the storage room 18 can be suppressed by stopping the blower 21.
[0037]
Note that the microcomputer 52 of the main control device 37 can selectively switch whether to execute the intermittent blower operation control by the input switch or to set the blower 21 to the continuous operation (the blower continuous operation control). The cooling control data is also calculated based on this setting, and when the continuous operation is performed, the blower 21 is continuously operated irrespective of the ON / OFF state of the compressor 31 as shown at the bottom of FIG. Thereby, when the cooling in the storage room 18 becomes better when the blower 21 is continuously operated according to the use situation, the continuous operation is switched to the continuous operation.
[0038]
Next, the defrost control in step S21 will be described. The microcomputer 52 of the main controller 37 generates defrosting control data for starting defrosting in the defrosting cycle input by the input switch in the calculation of the defrosting control data in step S7 in FIG. Send. The microcomputer 56 of the slave control device 36 stops the compressor 31 and the blower 21 based on the defrost control data transmitted from the main control device 37 in step S21 and starts the defrost heater 47 to generate heat.
[0039]
Thereby, the cooler 19 is heated and defrosting is performed. When the temperature of the cooler 19 rises as the defrosting progresses and reaches the above-described defrosting end temperature (for example, + 8 ° C.), this is detected by the cooler temperature sensor 58 (when there are a plurality of cooler temperature sensors). Is the average value). Then, the microcomputer 52 of the main control device 37 determines that the defrosting is completed based on the cooler temperature data transmitted from the subordinate control device 36 in step S7, generates defrosting end defrosting control data, and makes the subordinate control device 36 Send. The microcomputer 56 of the slave controller 36 ends the defrosting based on the defrosting control data at the end of the defrosting in step S21 (stops the power supply to the defrosting heater 47). After that, the process returns to the cooling control by the compressor 31 and the blower 21.
[0040]
If the defrosting of the cooler 19 is not started even after 60 minutes have elapsed after the start of defrosting, the main controller 37 transmits defrosting control data indicating that defrosting has been completed to the slave controller 36 to forcibly end the defrosting. Shall be allowed.
[0041]
(2) Operation when communication is not possible and each temperature sensor is normal Here, when data communication between main controller 37 and slave controller 36 is disabled for some reason, each of temperature sensors 57 and 58 is normal. In some cases, the microcomputer 56 of the slave controller 36 proceeds from step S14 in FIG. 7 to step S15, further proceeds to step S16, and proceeds from step S16 to step S17. In step S17, it is determined whether or not there is set temperature data transmitted from the main control device 37. If the set temperature data is stored in the memory, the process proceeds to step S18, where the immediately preceding (the latest when changed after power-on) is performed. Based on the set temperature data and the temperature of the storage room 18 detected by the storage room temperature sensor 57, the same cooling control (control of the compressor 31 and the blower 21) as shown in FIG. 10 is executed.
[0042]
If communication is disabled from the beginning of the power supply, the set value data is not transmitted from the main controller 37 to the slave controller 36. In this case, the microcomputer 56 proceeds from step S17 to step S22, and uses the same set temperature data (for example, + 3 ° C.) and storage room temperature data previously stored in the memory as defaults as shown in FIG. Execute cooling control.
[0043]
Next, the process proceeds to step S19, in which the defrosting of the cooler 19 is started at a defrosting cycle (for example, 6 hours) previously stored in the memory by default, and the defrosting end temperature of the cooler 19 detected by the cooler temperature sensor 58 is detected. The defrost control for terminating the defrost is executed at (for example, + 10 ° C. which is also stored in the memory by default).
[0044]
(3) Operation when communication is normal and storage room temperature sensor or cooler temperature sensor is disabled In addition, data communication between main controller 37 and slave controller 36 is normal, and storage room temperature sensor 57 fails (impossible). ), The storage room temperature data is no longer transmitted to the main controller 37, and the microcomputer 52 of the main controller 37 proceeds from step S3 to step S10 in FIG. Do. Then, the process proceeds to step S11, where cooling control data is calculated from the ON / OFF time of the compressor 31, and is transmitted to the slave controller 36 in step S5.
[0045]
The calculation operation of the microcomputer 52 of the main controller 37 in step S11 will be described with reference to FIG. When the number of ON-OFF operations of the compressor 31 is three or more, the microcomputer 52 calculates the ON average time (average value) by dividing the total ON time by the number of ON times, and sets the total OFF time to OFF. The OFF average time (average value) is calculated by dividing by the number of times. In this case, the ON time at the time of turning on the power or at the time of pull-down after the completion of defrosting and the OFF time immediately thereafter are not included in the calculation of the average value (not applicable). As a result, it is possible to calculate the average value more appropriately corresponding to the operating state.
[0046]
However, when the power is turned on, when defrosting is completed, when the total ON or OFF time exceeds, for example, 60 minutes (predetermined time), when the number of ON or OFF times exceeds, for example, 6 times (predetermined number), The microcomputer 52 resets the calculated value. If the average value of ON-OFF cannot be calculated when the storage room temperature data has not been received since the power was turned on in step S11, the default ON of the microcomputer 52 is controlled similarly to the control in step S27 described later. The cooling control data is generated by the time and the OFF time.
[0047]
On the other hand, the slave controller 36 proceeds from step S14 to step S23 in FIG. 8, proceeds from step S23 to step S26, holds the set temperature data transmitted from the main controller 37, and receives the ON average time and the OFF average received. On-off control of the compressor 31 and the blower 21 is performed based on the time-based cooling control data (the blower 21 includes the intermittent operation and the continuous operation). Thereby, even when the storage room temperature sensor 57 fails, the inside of the storage room 18 can be cooled without any trouble.
[0048]
Further, when the data communication between the main controller 37 and the slave controller 36 is normal and the cooler temperature sensor 58 has failed (disabled), cooler temperature data is transmitted to the main controller 37. The microcomputer 52 of the main controller 37 proceeds from step S6 in FIG. 6 to step S12 and displays a predetermined alarm on the display 53. Then, the process proceeds to step S13, where the microcomputer 52 transmits default defrost control data to the slave controller 36.
[0049]
In the default defrost control data, data is transmitted at the defrost cycle set by the above-described input switch at the start of defrost, and at one hour (predetermined time) after the start, for example, at the end of defrost.
[0050]
On the other hand, the slave controller 36 proceeds from step S15 to step S28 in FIG. 9 and proceeds from step S28 to step S30 to execute defrost control of the cooler 19 based on the defrost control data transmitted from the main controller 37. . That is, defrosting is started at the defrosting cycle set by the input switch described above, and defrosting is ended one hour after the default (predetermined time) from the start. Thus, even when the cooler temperature sensor 58 fails, the cooler 19 can be defrosted without any trouble.
[0051]
After executing the control of FIG. 8 when the storage room temperature sensor 57 has failed, the microcomputer 56 returns to step S15. In this case, even if the cooler temperature sensor 58 is normal, the subsequent steps S21 and S18, the cooling control in step S22 is not executed (the same applies hereinafter).
[0052]
(4) Operation when communication is disabled / storage room temperature sensor or cooler temperature sensor is disabled Next, data communication between main controller 37 and slave controller 36 is disabled as described above, and storage room temperature If the sensor 57 has failed (impossible), the microcomputer 56 of the slave control device 36 proceeds from step S14 in FIG. 7 to step S23 in FIG. 8, and from step S23 to step S24, where the compressor 31 Is turned on or off. If ON-OFF is performed three times or more, for example, the process proceeds to step S25 to calculate each average time in the same manner as the calculation of the ON average time and the OFF average time in FIG. The cooling control by the blower 21 is performed.
[0053]
If the state has been turned on since the power was turned on, the microcomputer 56 does not perform ON-OFF, so the microcomputer 56 proceeds to step S27, and the microcomputer 56 proceeds to the default ON time The cooling control by the compressor 31 and the blower 21 is executed during the OFF time (for example, a duty of 10 minutes ON—10 minutes OFF).
[0054]
If data communication between the main control device 37 and the slave control device 36 is not possible and the cooler temperature sensor 58 has also failed (impossible), the microcomputer 56 of the slave control device 36 performs steps S15 to S15. Proceeding to S28, the process proceeds from step S28 to step S29, in which the microcomputer 56 has a default defrost cycle (for example, start defrosting every six hours) and a defrost time (defrost end one hour after the start of defrost) stored in the memory in advance. The defrost control of the cooler 19 is executed.
[0055]
As a result, even when communication between the main control device 37 and the sub control device 36 is not possible or when the temperature sensors 57 and 58 are out of order, the cooling control and the defrosting control can be executed without any trouble. However, each value of the temperature and the time described above is appropriately set according to the capacity and use of the cooling storage.
[0056]
Further, in the embodiment, the cooling storage with the built-in cooling unit is taken as an example. However, the invention is not limited thereto, and a compressor and a condenser are separately provided, and an electromagnetic valve (in that case, the electromagnetic valve serves as a refrigerant circulation control unit). The present invention is also effective for a so-called separately-installed cooling storage that controls the supply of the refrigerant to the cooler.
[0057]
Further, in the embodiment, the cooling control and the defrosting control are performed by performing communication between the main control device and the slave control device. However, the present invention is not limited to this. The above control may be executed by connecting a room temperature sensor, a cooler temperature sensor, and a relay.
[0058]
【The invention's effect】
As described above in detail, according to the present invention, a cooler, a refrigerant circulation control unit that controls circulation of the refrigerant to the cooler, and a blower that circulates cool air that has exchanged heat with the cooler into the storage chamber are provided. A storage room temperature detecting means for detecting the temperature in the storage room, and a control for controlling the refrigerant circulation control means and the blower based on the temperature detected by the storage room temperature detecting means and the set temperature in the storage room. The control device controls ON-OFF of the refrigerant circulation control means, and operates the blower when the refrigerant circulation control means is ON, and operates when the refrigerant circulation control means is OFF. Since the blower is stopped for a predetermined time after the refrigerant circulation control means is turned off, and then the blower intermittent operation control for operating the blower for a predetermined time is repeated, the refrigerant circulation control means is turned off. While suppressing the occurrence of temperature unevenness in the storage compartment in the case that, it also promotes temperature increase in the storage compartment caused by the operation of the blower as it can be suppressed as much as possible.
[0059]
According to the invention of claim 2, in addition to the above, the control device can selectively execute the intermittent operation control of the blower and the control for continuously operating the blower regardless of the ON-OFF control of the refrigerant circulation control means. Therefore, it is possible to switch between the intermittent operation and the continuous operation of the blower in accordance with the use condition of the cooling storage, which is very convenient.
[Brief description of the drawings]
FIG. 1 is a front view of a cooling storage according to an embodiment of the present invention.
FIG. 2 is a plan view of the cooling storage of FIG. 1;
FIG. 3 is a sectional view taken along line AA of FIG. 2;
FIG. 4 is a sectional view taken along line BB of FIG. 2;
FIG. 5 is a block diagram of an electric circuit of the cooling storage of FIG. 1;
FIG. 6 is a flowchart illustrating control of a main control device in FIG. 5;
FIG. 7 is a flowchart illustrating control of a slave control device in FIG. 5;
FIG. 8 is a flowchart illustrating control of the slave control device of FIG. 5;
FIG. 9 is a flowchart illustrating the control of the slave control device of FIG. 5;
FIG. 10 is a timing chart illustrating cooling control of the cooling storage in FIG. 1;
FIG. 11 is a diagram illustrating a method for calculating an ON average time and an OFF average time of the compressor in the cooling storage in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cooling storage 6 Heat insulation box 7 and 8 Heat insulation door 16 Cooling room 18 Storage room 19 Cooler 21 Blower 31 Compressor 36 Slave control device 37 Main control device 47 Defrost heater 52 and 56 Microcomputer 53 Display 57 Storage room temperature sensor 58 Cooler temperature sensor 59 Relay

Claims (2)

In a cooling storage comprising a cooler, a refrigerant circulation control means for controlling circulation of the refrigerant to the cooler, and a blower for circulating cool air having exchanged heat with the cooler into a storage chamber,
A storage room temperature detection unit that detects the temperature in the storage room, and a control unit that controls the refrigerant circulation control unit and the blower based on the temperature detected by the storage room temperature detection unit and a set temperature in the storage room. Prepare,
The control device controls the refrigerant circulation control means ON-OFF, and operates the blower when the refrigerant circulation control means is ON, and when the refrigerant circulation control means is OFF, A cooling storage, wherein the blower is stopped for a predetermined time after the refrigerant circulation control means is turned off, and then intermittent operation control of the blower for operating the blower for a predetermined time is repeated. 2. The control device according to claim 1, wherein the intermittent operation control of the blower and a control of continuously operating the blower regardless of ON-OFF control of the refrigerant circulation control unit can be selectively executed. 3. Cold storage.

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