JP6496570B2 - Cooling storage - Google Patents

Description

  The present invention relates to a cooling storage that can be used as a freezer or a refrigerator.

  Conventionally, a cooling storage that can be used as a freezer or a refrigerator is known (see, for example, Patent Document 1). The refrigerator described in Patent Document 1 includes an inverter compressor as a compressor with a variable rotation speed, and the freezer compartment is set to a refrigeration temperature zone by increasing the variable speed range of the inverter compressor, or the refrigerator compartment is frozen. It can be set to a temperature range.

JP-A-2005-106454

  In a cold storage that can be used as a freezer or a refrigerator, a cooler having a higher cooling capacity than a cooler of a cold storage that is used only as a refrigerator is used for use as a freezer. However, if the cooling capacity of the cooler is high, there is a disadvantage when the cooling storage is used as a refrigerator. Conventionally, such inconvenience has not been studied.

  In this specification, the technique which reduces the inconvenience in using a cooling storage as a freezer and a refrigerator is disclosed.

  The cooling storage disclosed in the present specification is a cooling storage that can be used as a freezer or a refrigerator, and has a refrigerator having a compressor with a variable rotation speed, and setting in the storage in the range from the freezing area to the refrigerating area A setting receiving unit that receives a temperature setting, and a control unit that controls the cooling storage; and the control unit controls the cooling storage when the set temperature in the storage is lower than a reference temperature near 0 ° C. Switch to freezer control. If the temperature is above the reference temperature, switch to refrigerator control.

When using a cooler with a high cooling capacity for the case where the cooling storage is used as a freezer, there is a disadvantage that even if the cooling storage is used as a refrigerator, the control for the freezer is not applied as it is. .
According to the above-described cooling storage, when the internal set temperature is lower than the reference temperature near 0 ° C., it switches to the control for the freezer, and when it is higher than the reference temperature, it switches to the control for the refrigerator to control the cooling storage. The cooling storage can be appropriately controlled both when used as a refrigerator and when used as a refrigerator. Thereby, the inconvenience at the time of using a cooling storage as a freezer and a refrigerator can be reduced.

  Moreover, said cooling storage is provided with the internal temperature sensor which detects the internal temperature, and the said control part is 1st with respect to the said internal set temperature in the internal temperature detected by the said internal temperature sensor. When the temperature falls below the temperature, the rotation of the compressor is stopped. When the stop time reaches the minimum stop time or more and the internal temperature rises by a second temperature or more with respect to the internal set temperature, the rotation of the compressor is stopped. The minimum stop time includes a minimum stop time for a freezer and a minimum stop time for a refrigerator that is shorter than the minimum stop time for the freezer. When the temperature is lower than the temperature, the minimum stop time may be switched to the minimum stop time for the freezer, and when the temperature is equal to or higher than the reference temperature, the minimum stop time for the refrigerator may be switched.

According to the above cooling storage, the internal temperature can be substantially maintained in the range from “internal set temperature−first temperature” to “internal set temperature + second temperature”. By the way, when the rotation of the compressor is stopped, when the rotation is restarted after that, if the pressure in the cooler is not uniform, a starting failure may occur. For this reason, it is desirable to lengthen the minimum stop time so that the pressure in the cooler becomes uniform. However, when used as a refrigerator, if the minimum stop time is long, the inside temperature may rise too much.
According to the cooling storage above, the minimum stop time is switched to the minimum stop time for the freezer when the set temperature is below the reference temperature, and the minimum stop time for the refrigerator is switched to the minimum stop time when the temperature is above the reference temperature. In the case of being used, it is possible to suppress the start-up failure more reliably and to prevent the internal temperature from being excessively increased when used as a refrigerator.

  In addition, the cooling storage unit includes a defrost heater that defrosts frost attached to the evaporator constituting the cooler, and the defrosting method of the evaporator stops the compressor, and There is a heater defrost system that heats the evaporator with a defrost heater, and an off-cycle defrost system that stops the compressor while not performing heating with the defrost heater, and the control unit is configured to set the internal temperature When the temperature is lower than the reference temperature, the defrosting method of the evaporator may be switched to the heater defrost method, and when the temperature is equal to or higher than the reference temperature, the off-cycle defrost method may be switched.

When the cold storage is used as a freezer, it is desirable to defrost by a heater defrost method in order to melt frost reliably because the temperature in the refrigerator is low. On the other hand, since the internal temperature is high when used as a refrigerator, the frost is sufficiently melted if the rotation of the compressor stops and the internal temperature rises. Nevertheless, if frost is melted by the defrost heater, power is wasted.
According to the above cooling storage, it is switched to the heater defrost method when the set temperature in the chamber is lower than the reference temperature, and to the off-cycle defrost method when the set temperature is higher than the reference temperature. However, when used as a refrigerator, power consumption during defrosting can be suppressed.

  The cooling storage unit includes an internal temperature sensor that detects an internal temperature, an external temperature sensor that detects an external temperature, and a dew condensation prevention heater that heats an opening edge of the cooling storage, and the control The unit includes an internal temperature detected by the internal temperature sensor and an external air temperature detected by the external air temperature sensor from an energization rate setting in which an energization rate corresponding to a difference between the internal temperature and the external air temperature is defined. The energization rate corresponding to the difference is obtained, the energization rate of the dew condensation prevention heater is changed to the acquired energization rate, and the energization rate setting includes the energization rate setting for the freezer, the internal temperature and the outside air temperature. There is an energization rate setting for the refrigerator in which an energization rate different from the energization rate setting for the freezer is defined with respect to the difference of the freezer, and the control unit, when the set temperature in the refrigerator is less than the reference temperature Switch to the current ratio setting for the freezer Instead, if more than the reference temperature may be switched to a duty factor set for the refrigerator.

When the cooling storage is used as a freezer and when it is used as a refrigerator, the ease of condensation is different even if the difference between the internal temperature and the outside air temperature is the same. For this reason, if the same energization rate is used for a refrigerator as that for a freezer, the opening edge is excessively heated and power is wasted or condensate is prevented due to insufficient heating. I couldn't do it.
According to the above cooling storage, when the internal set temperature is lower than the reference temperature, it switches to the energization rate setting for the freezer, and when it is above the reference temperature, it switches to the energization rate setting for the refrigerator, so it may be used as a freezer Even when used as a refrigerator, it is possible to suppress that the opening edge is excessively heated and power is wasted, or conversely, condensation is not prevented due to insufficient heating.

  Moreover, said cooling storage is provided with the internal temperature sensor which detects the internal temperature, and when the internal temperature falls to the internal set temperature in the control method of the compressor, the internal temperature is the internal setting. A control method for a freezer that rotates at a rotational speed that is maintained at a temperature, and even if the internal temperature is lowered to the internal set temperature, the internal temperature is rotated at a rotational speed that is lower than the internal set temperature, When the internal temperature detected by the internal temperature sensor falls below the first set temperature with respect to the internal set temperature, the rotation is stopped or the rotation speed is slowed down, and the internal temperature is set to the internal set temperature. And a control method for the refrigerator that resumes rotation when the temperature rises above the second temperature, and the control unit uses the control method of the compressor for the freezer when the set temperature in the refrigerator is lower than the reference temperature. Switch to the control method For more temperature may be switched to control system for the refrigerator.

If the number of times of rotating / stopping the compressor is increased, energy efficiency is lowered. If the compressor is rotated at a rotation speed at which the internal temperature is maintained at the internal set temperature, the internal temperature is unlikely to decrease to a temperature lower than the internal set temperature by the first temperature or more. The number of times of switching can be reduced. Thereby, energy efficiency can be improved.
However, when used as a refrigerator, the number of times that the heat insulation door of the cooling storage is opened and closed is high, so the internal temperature is set to the internal temperature in order to quickly reduce the internal temperature when the heat insulation door is opened and closed. It is desirable to rotate the compressor at a lower rotational speed.
According to the above cooling storage, the compressor control method is switched to the freezer control method when the internal set temperature is lower than the reference temperature, and the refrigerator control method is switched to the refrigerator control method when the temperature is higher than the reference temperature. When it is used, the internal temperature can be quickly lowered when used as a refrigerator while improving energy efficiency.

  In addition, the cooling storage unit is an internal fan that circulates the cold air cooled by the cooler in the storage, and includes an internal fan capable of switching a rotation speed between a low speed and a high speed, and the internal fan The control method for the freezer is to rotate at a high speed until the internal temperature drops to the internal set temperature, and when the internal temperature drops to the internal set temperature, the control system for the freezer that rotates at a low speed, and until the compressor stops Rotating at high speed, while the compressor is stopped, stop the fan in the warehouse or rotate at low speed, and when the rotation of the compressor is resumed, the control method for the refrigerator to rotate at high speed, When the control unit of the compressor is switched to the control method for the freezer, the control method of the internal fan is also switched to the control method for the freezer, and the control method of the compressor is changed. Frozen Control method of the in-compartment fan when switching the control method of use may also be switched to the control system for the refrigerator.

When rotating the compressor at a rotation speed at which the internal temperature is maintained at the internal set temperature, leave the internal fan rotating at a high rotational speed even after the internal temperature drops to the internal set temperature. The internal temperature may be lower than the internal set temperature. On the other hand, when the compressor is rotated at a rotational speed at which the internal temperature falls below the internal set temperature, if the internal fan temperature is reduced to the internal set temperature, the internal fan temperature is reduced. However, it becomes difficult to lower to a temperature lower than the first temperature by a temperature lower than the first set temperature.
According to the above cooling storage, when the compressor is rotated at a rotation speed at which the internal temperature is maintained at the internal set temperature, the internal fan speed decreases when the internal temperature decreases to the internal set temperature. Therefore, it can suppress that the temperature in a store | warehouse | chamber falls from the set temperature in a store | warehouse | chamber. On the other hand, when rotating the compressor at a rotational speed at which the internal temperature falls below the internal set temperature, the internal fan rotates at a high rotational speed even if the internal temperature drops to the internal set temperature. The inside temperature can be lowered to a temperature lower than the first temperature by a first temperature or more.

  According to the cooling storehouse disclosed in the present specification, it is possible to reduce inconveniences when the cooling storehouse is used as a freezer or a refrigerator.

Front view of the cooling storage according to the first embodiment Sectional view of the AA line shown in FIG. Block diagram showing the electrical configuration of the cooling storage Graph for explaining control for freezer Graph for explaining control for refrigerator The block diagram which shows the electrical constitution of the cooling storage which concerns on Embodiment 2. FIG. Graph for explaining the heater defrost system Graph for explaining off-cycle defrost system The block diagram which shows the electric constitution of the cooling storage which concerns on Embodiment 3. FIG. Graph showing the difference between the power supply rate setting for the freezer and the power supply rate setting for the refrigerator The graph for demonstrating the control for freezers concerning Embodiment 4. Graph for explaining control for refrigerator

<Embodiment 1>
The first embodiment will be described with reference to FIGS. In the following description, the up-down direction and the left-right direction refer to the up-down direction and the left-right direction shown in FIG. 1, and the front-rear direction refers to the front-rear direction shown in FIG.

(1) Overall configuration of cooling storage 1 With reference to FIG. 1, the overall configuration of the cooling storage 1 according to the first embodiment will be described. The cooling storage 1 is a four-door type for business use, and includes a storage body 10 made of a heat insulating box with a front opening. Two pairs of left and right heat insulating doors 12 of a double door opening type that opens and closes the front opening are attached to the storage body 10 vertically. Further, four legs 13 that support the storage body 10 are attached to the lower surface of the storage body 10.

  A machine room 11 having an upper side opened is provided on the storage body 10. The machine room 11 accommodates a control unit 40 (see FIG. 3), a cooling unit 30 (see FIG. 2), and the like. An operation unit 14 is provided on the front surface of the machine room 11. The operation unit 14 is an example of a setting reception unit.

(2) Internal structure of cooling storage As shown in FIG. 2, a shelf receiving member 22 is fixed to the left inner wall surface 20 and the rear inner wall surface 21 of the storage body 10. Further, the shelf receiving member 22 is also fixed to the inner wall surface on the right side (not shown) of the storage body 10. These shelf receiving members 22 are provided with a plurality of steps in the vertical direction, and the shelf network 23 is supported in multiple steps by these steps. A substantially rectangular opening 10 </ b> B is formed in the ceiling wall 10 </ b> A of the storage body 10.

The cooling unit 30 is a unit formed by attaching an inverter compressor 31, a condenser 32, an evaporator 33, and a capillary tube (not shown) constituting a cooler to a heat insulating unit base 35. The inverter compressor 31 is an example of a compressor having a variable rotation speed.
Specifically, the inverter compressor 31, the condenser 32, and the capillary tube are attached to the upper surface of the unit table 35, and the evaporator 33 is attached to the lower surface of the unit table 35. Further, an internal temperature sensor 36 for detecting the internal temperature is attached to the lower surface of the unit base 35.

  The unit base 35 is formed in a substantially rectangular shape that is slightly larger than the opening 10B formed in the ceiling wall 10A of the storage body 10, and is disposed on the ceiling wall 10A so as to close the opening 10B. Since the evaporator 33 is attached to the lower surface of the unit table 35, the evaporator 33 is not stored in the machine room 11, but is stored in an air circulation path constituted by the ceiling (the ceiling wall 10 </ b> A and the unit table 35) and the duct portion 37. Has been.

  The duct portion 37 has a bottom wall 37A and a pair of side walls (not shown) that rise substantially in parallel from the left and right edges of the bottom wall 37A, and covers the evaporator 33 from below so as to cover the evaporator 33 from below. Hanging on the ceiling. The duct portion 37 is for forming an air circulation path with the ceiling, and for receiving defrost water which is water in which frost attached to the evaporator 33 is melted.

  A suction port is formed on the front side of the duct portion 37, and the internal fan 38 is fitted and attached to the suction port from above. When the internal fan 38 rotates, the internal air is sucked into the air circulation path and cooled by the evaporator 33. The bottom end of the bottom wall 37A does not reach the rear wall 10C of the storage body 10, and the air cooled by the evaporator 33 blows out into the cabinet through the gap between the bottom wall 37A and the rear wall 10C. Is done.

  A drainage groove 37B for draining defrost water extends from the rear end of the bottom wall 37A toward the rear side. The front end of the drainage groove 37B is inserted into a drainage hole formed in the rear wall 10C of the storage body 10, and the defrost water received by the duct part 37 is drained out of the warehouse through the hole. The

(3) Electrical configuration of the cooling storage 1 Next, the electrical configuration of the cooling storage 1 will be described with reference to FIG. The control unit 40 is connected to the operation unit 14, the internal temperature sensor 36, and an inverter circuit 42 that drives the inverter compressor 31.

  The control unit 40 includes a CPU 40A, a ROM 40B, a RAM 40C, and the like. The CPU 40A controls each part of the cooling storage 1 by executing a program stored in the ROM 40B. The ROM 40B stores programs executed by the CPU 40A, various setting values used for control, and the like. The RAM 40C is used as a main storage device for the control unit 40 to execute various processes.

  The operation unit 14 includes an operation button for the user to set various setting values such as the internal set temperature, and a display device for displaying various information related to the refrigerator such as the internal temperature. . In the present embodiment, the internal set temperature can be set in a wide range (for example, −25 ° C. to + 5 ° C.) from the freezing area to the refrigeration area. The operation unit 14 may be configured by a touch panel.

(4) Temperature control by the control unit As shown in FIG. 4, when the cooling storage 1 is turned on, the control unit 40 waits for a predetermined time such as 5 minutes, and then the inverter compressor 31 Start rotation. And the control part 40 controls the rotational speed of the inverter compressor 31 so that the time-dependent change of internal temperature follows an ideal temperature curve.

  Specifically, the controller 40 detects the internal temperature at every predetermined sampling time by the internal temperature sensor 36, and the actual temperature drop that is the difference between the internal temperature detected last time and the internal temperature detected this time. The degree Sc is calculated. Then, the control unit 40 compares the calculated internal temperature Sc with the target value Ac of the temperature drop degree in the ideal temperature curve, and when the actual temperature drop degree Sc is smaller than the target value Ac, the rotation of the inverter compressor 31 is performed. Increase the speed, and decrease the rotation speed if larger.

  And if internal temperature falls more than 1st temperature with respect to internal setting temperature, the control part 40 will stop rotation of the inverter compressor 31 in order to prevent the internal temperature falling further. When the rotation of the inverter compressor 31 is stopped, the rotation of the internal fan 38 may be stopped or may be kept rotating. In this embodiment, the rotation is stopped.

  When the rotation of the inverter compressor 31 is stopped, the internal temperature gradually rises. In the control unit 40, the elapsed time (stop time) from when the rotation of the inverter compressor 31 is stopped reaches the minimum stop time (7 minutes in FIG. 4), and the internal temperature is second from the internal set temperature. When the temperature becomes higher than this temperature, the rotation of the inverter compressor 31 is resumed.

  For example, it is assumed that the internal set temperature is “−5 ° C.”, the first temperature is “2 ° C.”, and the second temperature is “4 ° C.”. In this case, the controller 40 stops the rotation of the inverter compressor 31 when the internal temperature reaches “−7 ° C. (= −5 ° C.−2 ° C.)”. Then, when the stop time reaches the minimum stop time, the control unit 40 restarts the rotation of the inverter compressor 31 at that time if the internal temperature is equal to or higher than “−1 ° C. (= −5 ° C. + 4 ° C.)”. If “−1 ° C.” has not been reached, the rotation of the inverter compressor 31 is resumed after waiting for “−1 ° C.”. As a result, the internal temperature is maintained in the range of “−1 ° C.” to “−7 ° C.”.

  Here, the reason why the rotation of the inverter compressor 31 is not restarted unless the stop time reaches the minimum stop time is to make it difficult for the start-up failure to occur when the rotation of the inverter compressor 31 is restarted. The inverter compressor 31 may fail to start if the pressure in the cooler is not uniform. If the inverter compressor 31 is stopped for a certain long time (minimum stop time), the pressure becomes more uniform, so that a start-up failure is less likely to occur. Therefore, the control unit 40 does not resume rotation unless the minimum stop time is reached.

(5) Switching of the minimum stop time by the control unit In order to make it difficult for start-up failures to occur more reliably, it is desirable to increase the minimum stop time. However, if the minimum stop time is increased, even if the internal temperature rises so as not to affect the food when used as a freezer, the internal temperature increases too much when used as a refrigerator. May be affected.

  Therefore, when the cooling storage 1 is turned on, or when the user sets the internal set temperature with the operation unit 14, the control unit 40 compares the internal set temperature with a reference temperature near 0 ° C. Thus, it is determined whether the cooling storage 1 is used as a freezer or a refrigerator. For example, when the reference temperature is 0 ° C., the control unit 40 determines that the refrigerator is used as a refrigerator when the internal set temperature is 0 ° C. or higher, and determines that it is used as a freezer when the temperature is lower than 0 ° C.

And when it judges that the control part 40 is used as a freezer, it switches the minimum stop time to the minimum stop time for freezers, and when it judges that it is used as a refrigerator, it is shorter than the minimum stop time for freezers. Switch to the minimum stop time.
Specifically, for example, when the control unit 40 determines to be used as a freezer, the minimum stop time is switched to 7 minutes as shown in FIG. 4, and when it is determined to be used as a refrigerator, as shown in FIG. Switch the minimum stop time to 5 minutes. In addition, these minimum stop time is an example, and the minimum stop time is not limited to these.

(6) Effects of the embodiment According to the cooling storage 1 according to the first embodiment described above, when the internal set temperature is lower than the reference temperature, the minimum stop time is switched to the minimum stop time for the freezer, and the temperature is equal to or higher than the reference temperature. Switches to a minimum stop time for the refrigerator that is shorter than the minimum stop time for the freezer, so when used as a freezer, the startup failure is more reliably suppressed than when used as a refrigerator, and when used as a refrigerator. It can suppress that the inside temperature rises too much. Thereby, the inconvenience in using the cooling storage 1 as a freezer or a refrigerator can be reduced.

<Embodiment 2>
Next, the second embodiment will be described with reference to FIGS.
When the cooler is operated, frost adheres to the evaporator 33 and the heat exchange rate decreases. Therefore, the cooling storage 1 according to the second embodiment includes a defrost heater 44 (see FIG. 6) that heats the evaporator 33.

Incidentally, when the cooling storage 1 is used as a freezer, the internal temperature is low, and therefore it is desirable to heat the evaporator 33 by the defrost heater 44 in order to melt the frost reliably. On the other hand, since the internal temperature is higher when used as a refrigerator than when used as a freezer, even if frost adheres to the evaporator 33, the rotation of the inverter compressor 31 stops and the internal temperature The frost will melt sufficiently if the temperature rises. Nevertheless, if frost is melted by the defrost heater 44, power is wasted.
Then, the control part 40 which concerns on Embodiment 2 switches a defrosting system with the case where the cooling storage 1 is used as a refrigerator, and the case where it is used as a refrigerator.

(1) Electrical Configuration of Cooling Storage As shown in FIG. 6, the cooling storage 1 according to the second embodiment is an evaporator that detects the temperature of the evaporator 33 in addition to the configuration of the cooling storage 1 according to the first embodiment. A temperature sensor 43 and a defrost heater 44 for heating the evaporator 33 are provided. The evaporator temperature sensor 43 and the defrost heater 44 are attached to the evaporator 33.

(2) Defrosting method Next, a defrosting method is demonstrated. Here, a method of defrosting using the defrost heater 44 is referred to as a heater defrost method, and a method of performing defrosting without using the defrost heater 44 is referred to as an off-cycle defrost method.

(2-1) Heater Defrost Method First, the heater defrost method will be described with reference to FIG. In the heater defrost method, the control unit 40 turns on the defrosting heater 44 when the internal temperature drops by a first temperature or more with respect to the internal set temperature and stops the rotation of the inverter compressor 31. When the defrost heater 44 is turned on, the evaporator 33 is heated and frost is melted.

  And the control part 40 monitors the temperature of the evaporator 33 by the evaporator temperature sensor 43, and if the temperature of the evaporator 33 rises to the completion | finish detection temperature (3 degreeC in this embodiment) preset, the defrost heater 44 will be shown. Turn off. Thereafter, the control unit 40 waits for a certain period of time to drain the water adhering to the evaporator 33, and then restarts the rotation of the inverter compressor 31.

(2-2) Off-Cycle Defrost Method Next, the off-cycle defrost method will be described with reference to FIG. In the off-cycle defrost method, the control unit 40 does not turn on the defrosting heater 44 when the internal temperature drops by a first temperature or more with respect to the internal set temperature and stops the rotation of the inverter compressor 31. That is, in the off-cycle defrost method, the evaporator 33 is not heated by the defrost heater 44.

  Then, the controller 40 monitors the temperature of the evaporator 33 by the evaporator temperature sensor 43, and when the temperature of the evaporator 33 rises to a preset end detection temperature (3 ° C. in the present embodiment), the inverter compressor The rotation of 31 is resumed.

(3) Switching of defrosting method by control unit The control unit 40 compares the internal set temperature with a reference temperature in the vicinity of 0 ° C, and determines that it is used as a freezer when the internal set temperature is lower than the reference temperature. Then, switch to the heater defrost method. On the other hand, when the internal set temperature is equal to or higher than the reference temperature, the control unit 40 determines that it is used as a refrigerator and switches to the off-cycle defrost method.

(4) Effects of the embodiment According to the cooling storage 1 according to the second embodiment described above, when the internal set temperature is lower than the reference temperature, the defrosting method of the evaporator 33 is switched to the heater defrost method, In such a case, since it is switched to the off-cycle defrosting method, power consumption during defrosting can be suppressed when used as a refrigerator while reliably defrosting when used as a freezer.

<Embodiment 3>
Next, Embodiment 3 will be described with reference to FIGS.
If there is a difference between the inside temperature and the outside air temperature, condensation occurs at the opening edge of the storage body 10. When condensation occurs, it may be a problem that the condensed water falls on the floor. For this reason, the cooling storage 1 according to the third embodiment prevents condensation by heating the opening edge by the condensation prevention heater 46 (see FIG. 9).

  By the way, if the dew condensation prevention heater 46 is always energized at a constant energization rate regardless of the difference between the inside temperature and the outside air temperature, it is useless when the difference between the inside temperature and the outside air temperature is small, in other words, when condensation is unlikely to occur. It will be heated, and power will be wasted.

  Therefore, in the third embodiment, the energization rate setting in which the energization rate according to the difference between the internal temperature and the outside air temperature is defined is stored in the ROM 40B. And the control part 40 acquires the electricity supply rate corresponding to the difference of internal temperature and external temperature from an electricity supply rate setting, and changes the electricity supply rate of the dew condensation prevention heater 46 to the acquired electricity supply rate concerned.

  However, the case where the cooling storage 1 is used as a freezer and the case where it is used as a refrigerator differ in the ease of condensation even if the difference between the internal temperature and the outside air temperature is the same. For this reason, for example, when the energization rate is defined according to the use as a freezer and the energization rate is used as it is when used as a refrigerator, the opening edge is excessively heated when used as a refrigerator. As a result, power is wasted, and conversely, condensation may not be prevented due to insufficient heating.

  Therefore, in the cooling storage 1 according to the third embodiment, the energization rate setting for the freezer and the energization rate setting for the refrigerator are stored in the ROM 40B, and the control unit 40 uses the cooling storage 1 as a freezer and as a refrigerator. Switch the energization rate setting depending on when it is used.

(1) Electrical Configuration of Cooling Storage As shown in FIG. 9, the cooling storage 1 according to the third embodiment is an outside air temperature sensor that detects the temperature outside the warehouse in addition to the configuration of the cooling storage 1 according to the first embodiment. 45 and the dew condensation prevention heater 46 described above. The outside air temperature sensor 45 is provided outside the storage body 10, and the dew condensation prevention heater 46 is attached to the back side of the edge of the front opening of the storage body 10.
Further, the ROM 40B according to the third embodiment stores an energization rate setting for the freezer and an energization rate setting for the refrigerator.

(2) Energization rate setting With reference to FIG. 10, the difference between the energization rate setting for the freezer and the energization rate setting for the refrigerator will be described. In FIG. 10, the vertical axis represents the apparent heater capacity [W]. The apparent heater capacity [W] is obtained by the following equation 1.

  Apparent heater capacity [W] = original heater capacity [W] × energization rate [%] Equation 1

  In FIG. 10, the solid line 51 indicates the apparent heater capacity [W] when switching to the power supply rate setting for the freezer, and the dotted line 52 indicates the apparent heater capacity [ W]. As shown in FIG. 10, in this embodiment, when the difference between the internal temperature and the outside air temperature is in the vicinity of 30 [K] to 50 [K], a higher energization rate is defined in the energization rate setting for the refrigerator. In other cases, a higher energization rate is defined in the energization rate setting for the freezer.

(3) Switching of energization rate setting by the control unit The control unit 40 compares the set temperature in the cabinet with a reference temperature in the vicinity of 0 ° C, and determines that it is used as a freezer if the set temperature in the cabinet is lower than the reference temperature. Then, switch to the energization rate setting for the freezer. On the other hand, when the set temperature in the refrigerator is equal to or higher than the reference temperature, the control unit 40 determines that it is used as a refrigerator and switches to the power supply rate setting for the refrigerator.

(4) Effects of the embodiment According to the cooling storage 1 according to the third embodiment described above, when the internal set temperature is lower than the reference temperature, switching to the energization rate setting for the freezer, and when the internal temperature is equal to or higher than the reference temperature, it is for the refrigerator. Switching to the current ratio setting, whether used as a freezer or as a refrigerator, the opening edge is overheated and power is wasted, and conversely, there is insufficient heating to prevent condensation. It can suppress that it does not.

<Embodiment 4>
Next, a fourth embodiment will be described with reference to FIGS.
If the number of times of switching the rotation / stop of the inverter compressor 31 is large, the energy efficiency may be reduced. When the internal temperature drops to the internal set temperature, after that, the inverter is compressed at a rotational speed at which the internal temperature is maintained at the internal set temperature (the rotational speed is lower than the rotational speed at which the internal temperature falls below the internal set temperature). When the machine 31 is rotated, the internal temperature hardly decreases to a temperature lower than the internal set temperature by the first temperature or more, so that the number of times that rotation / stop is switched can be reduced. Thereby, energy efficiency can be improved.

  However, in general, in a refrigerator, since the heat insulating door 12 is frequently opened and closed, when the heat insulating door 12 is opened and closed and the internal temperature rises, the internal temperature decreases to the internal set temperature in order to quickly decrease the internal temperature. Even so, it is desirable to rotate the inverter compressor 31 at a rotational speed at which the internal temperature is lower than the internal set temperature (the rotational speed at which the internal temperature is maintained at the internal set temperature). Further, in the case of a refrigerator, when the inverter compressor 31 is rotated at a low rotational speed, frost formation on the evaporator 33 is increased and the heat exchange rate is decreased, and accordingly, power consumption may be increased. In that sense as well, in the case of a refrigerator, it is desirable to rotate the inverter compressor 31 at a high rotational speed.

On the other hand, since a freezer generally has few opening / closing times of the heat insulation door 12, it is desirable to avoid the stop of the inverter compressor 31 as much as possible in order to improve energy efficiency. In other words, in the case of a freezer, it is desirable to rotate the inverter compressor 31 at a rotational speed at which the internal temperature is maintained at the internal set temperature (a rotational speed that is lower than the rotational speed at which the internal temperature is lower than the internal set temperature). .
Therefore, the control unit 40 according to the fourth embodiment switches the control method of the inverter compressor 31 between when the cooling storage 1 is used as a freezer and when it is used as a refrigerator.

  Further, when the inverter compressor 31 is rotated at a rotation speed at which the internal temperature is lower than the internal set temperature, when the internal fan 38 is reduced to the internal set temperature, the rotational speed of the internal fan 38 is reduced. It will be difficult for the internal temperature to decrease to a temperature lower than the first temperature by at least the first temperature. On the other hand, when the inverter compressor 31 is rotated at a rotation speed at which the internal temperature is maintained at the internal set temperature, the internal fan 38 is rotated at a high rotational speed even after the internal temperature has decreased to the internal set temperature. If it is left as it is, the internal temperature may be lower than the internal set temperature.

  Then, the control part 40 switches the control system of the fan 38 in a store | warehouse | chamber, when the cooling storage 1 is used as a freezer, and the case where it is used as a refrigerator.

(1) Electrical configuration of the cooling storage 1 The electrical configuration of the cooling storage 1 according to the fourth embodiment is substantially the same as the configuration of the cooling storage 1 according to the first embodiment, but the internal fan 38 according to the fourth embodiment. Is configured to be able to switch the rotation speed between high speed and low speed.

(2) Control system of inverter compressor Next, the control system for freezers of the inverter compressor 31 and the control system for refrigerators will be described.

(2-1) Control system for freezer First, the control system for the freezer of the inverter compressor 31 is demonstrated with reference to FIG. In the control system for the freezer, the control unit 40 continues at a low rotational speed by the control method of the temperature drop degree 0 that controls the rotation speed so that the temperature drop degree Sc becomes 0 when the inside temperature drops to the set temperature inside the warehouse. Driving.

  Specifically, when the power of the cooling storage 1 is turned on, the control unit 40 waits for a predetermined time such as 5 minutes and then starts the rotation of the inverter compressor 31, as in the first embodiment. The rotational speed of the inverter compressor 31 is controlled according to the difference between the temperature drop degree Sc and the target value Ac. And the control part 40 will rotate the inverter compressor 31 at the rotational speed by which the internal temperature is maintained by the internal set temperature when the internal temperature falls to the internal set temperature. For this reason, when the internal temperature decreases to the internal set temperature, the temperature drop degree Sc becomes substantially zero.

  Here, in FIG. 11, the reason why the internal temperature is temporarily increased after the internal temperature has decreased to the internal set temperature is that the heat insulating door 12 of the cooling storage 1 has been opened and closed. When the heat insulating door 12 is opened and closed, the internal temperature increases, but the internal compressor temperature is set in the internal storage by rotating the inverter compressor 31 at a rotation speed at which the internal temperature is maintained at the internal set temperature. Decrease again to temperature.

(2-2) Control System for Refrigerator Next, a control system for the refrigerator of the inverter compressor 31 will be described with reference to FIG. In the control method for the refrigerator, the control unit 40 performs high rotation by control of the temperature drop degree non-zero that controls the rotation speed so that the temperature drop degree Sc becomes larger than 0 even if the inside temperature falls to the set temperature inside the room. Operate intermittently by number.

  Specifically, when the power of the cooling storage 1 is turned on, the control unit 40 waits for a predetermined time such as 5 minutes, and then rotates the inverter compressor 31 so that the temperature is the same as in the first embodiment. The rotational speed of the inverter compressor 31 is controlled according to the difference between the degree of descending Sc and the target value Ac. Then, the control unit 40 rotates the inverter compressor 31 at a rotational speed at which the internal temperature decreases below the internal set temperature even when the internal temperature decreases to the internal set temperature. For this reason, the temperature drop degree Sc becomes larger than 0 even after the internal temperature is lowered to the internal set temperature.

  And the control part 40 will stop rotation of the inverter compressor 31, if internal temperature falls more than 1st temperature with respect to internal setting temperature. When the rotation of the inverter compressor 31 is stopped, the internal temperature gradually rises. When the internal temperature rises by a second temperature or more with respect to the internal set temperature, the control unit 40 rotates the inverter compressor 31 again. By repeating this, the internal temperature is substantially maintained in a range from “internal set temperature−first temperature” to “internal set temperature + second temperature”.

(3) Control System for Internal Fan Next, a control system for the freezer of the internal fan 38 and a control system for the refrigerator will be described.

(3-1) Control System for Freezer First, the control system for the freezer of the internal fan 38 will be described with reference to FIG. When the power of the cooling storage 1 is turned on, the control unit 40 waits for a predetermined time such as 5 minutes and then sets the internal fan 38 at a high speed in order to lower the internal temperature to the internal set temperature. Rotate. Then, when the internal temperature drops to the internal set temperature, the control unit 40 switches the rotational speed of the internal fan 38 to a low speed so that the internal temperature does not further decrease.

  In addition, when the internal fan 38 is rotated at a low speed, the control unit 40 rotates the internal fan 38 in order to lower the internal temperature when the internal temperature is increased by opening and closing the heat insulating door 12. Make it faster. Specifically, the control unit 40 increases the rotational speed of the internal fan 38 when the internal temperature detected by the internal temperature sensor 36 is higher than the internal set temperature by 0.5 K (Kelvin) or more. And the control part 40 will return the rotational speed of the internal fan 38 to a low speed, if the internal temperature falls to internal set temperature.

(3-2) Control Method for Refrigerator Next, a control method for the refrigerator of the internal fan 38 will be described with reference to FIG. When the power of the cooling storage 1 is turned on, the control unit 40 waits for a predetermined time such as 5 minutes, and then lowers the internal temperature to a temperature lower than the internal set temperature by a first temperature or more. The internal fan 38 is rotated at high speed. And the control part 40 will stop the fan 38 in a store | warehouse | chamber, if internal temperature falls more than 1st temperature with respect to preset internal temperature. Then, when two minutes have elapsed from when the internal fan 38 is stopped, the control unit 40 rotates the internal fan 38 at a low speed for draining water, and the internal temperature is a second temperature relative to the internal set temperature. When it rises above, the internal fan 38 is rotated again at a high speed.

(4) Switching of control method by control unit The control unit 40 compares the internal set temperature with the reference temperature, and determines that the internal compressor is used as a freezer when the internal set temperature is lower than the reference temperature. The control method of 31 and the control method of the internal fan 38 are switched to the control method for the freezer. On the other hand, when the temperature is equal to or higher than the reference temperature, the control unit 40 determines that the control unit 40 is used as a refrigerator, and switches the control method of the inverter compressor 31 and the control method of the internal fan 38 to the control method for the refrigerator.

(5) Effect of Embodiment According to the cooling storage 1 according to the fourth embodiment described above, when the internal set temperature is lower than the reference temperature, the control method of the inverter compressor 31 is switched to the control method for the freezer, and the reference temperature In the above case, since it switches to the control system for refrigerators, when used as a refrigerator, the internal temperature is quickly increased when the insulated door 12 is opened and closed while improving energy efficiency when used as a freezer. Can be reduced.

  Further, according to the cooling storage 1, when the inverter compressor 31 is rotated at a rotation speed at which the internal temperature is maintained at the internal set temperature, the internal fan 38 rotates when the internal temperature decreases to the internal set temperature. Since the speed is reduced, it can be suppressed that the internal temperature is lower than the internal set temperature. On the other hand, when the inverter compressor 31 is rotated at a rotational speed at which the internal temperature is lower than the internal set temperature, the internal fan 38 is rotated at a high rotational speed even if the internal temperature decreases to the internal set temperature. Thus, the internal temperature can be lowered to a temperature lower than the first set temperature by at least the first temperature.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope disclosed by the present specification.

  (1) In the above embodiment, the case where the reference temperature is 0 ° C. has been described as an example. However, the reference temperature is not limited to 0 ° C. and can be appropriately determined in the vicinity of 0 ° C.

  (2) In the above embodiment, the 4-door type cooling storage 1 has been described as an example of the cooling storage, but the cooling storage is not limited to the 4-door type, and may be used as a freezer or a refrigerator. Any cooling storage can be used.

  (3) In the fourth embodiment, the case where the rotation of the inverter compressor 31 is stopped when the internal temperature is lower than the internal set temperature by the first temperature or more has been described as an example. On the other hand, the rotation of the inverter compressor 31 may be continued at a rotation speed at which the internal temperature rises instead of being completely stopped.

DESCRIPTION OF SYMBOLS 1 ... Cooling storage, 14 ... Operation part, 30 ... Cooling unit, 31 ... Inverter compressor, 33 ... Evaporator, 36 ... Chamber temperature sensor, 38 ... Warehouse Inner fan, 40 ... control unit, 44 ... defrost heater, 45 ... outside temperature sensor, 46 ... dew condensation prevention heater

Claims (5)

It is a cooling storage that can be used as a freezer or a refrigerator,
A cooler having a compressor with a variable rotational speed;
A setting accepting unit that accepts the setting of the set temperature in the refrigerator in the range from the freezing area to the refrigerated area;
A control unit for controlling the cooling storage;
An internal temperature sensor for detecting the internal temperature,
With
The control unit stops the rotation of the compressor when the internal temperature detected by the internal temperature sensor decreases by a first temperature or more with respect to the internal set temperature, and the stop time becomes the minimum stop time or more. And when the internal temperature rises by a second temperature or more with respect to the internal set temperature, the rotation of the compressor is resumed,
The minimum stop time includes a minimum stop time for a freezer and a minimum stop time for a refrigerator shorter than the minimum stop time for the freezer,
The control unit switches the minimum stop time to the minimum stop time for the freezer when the set temperature in the refrigerator is lower than a reference temperature near 0 ° C. , and the minimum stop time for the refrigerator when the set temperature is equal to or higher than the reference temperature. Switch to the cooling storage. The cooling storage according to claim 1 ,
Comprising a defrosting heater for defrosting frost adhering to the evaporator constituting the cooler;
In the defrosting method of the evaporator, the compressor is stopped and the evaporator is heated by the defrosting heater, and the compressor is stopped, but the heating by the defrosting heater is not performed. There is an off-cycle defrost method,
The control unit switches the defrosting method of the evaporator to the heater defrost method when the set internal temperature is lower than the reference temperature, and switches to the off-cycle defrost method when the temperature is equal to or higher than the reference temperature. . The cooling storage according to claim 1 or 2 ,
An internal temperature sensor for detecting the internal temperature,
An outside temperature sensor for detecting the outside temperature;
A dew condensation prevention heater for heating the opening edge of the cooling storage;
With
The controller controls the internal temperature detected by the internal temperature sensor and the external air detected by the external air temperature sensor from an energization rate setting in which an energization rate corresponding to the difference between the internal temperature and the external air temperature is defined. Obtaining an energization rate corresponding to a difference with temperature, changing the energization rate of the dew condensation prevention heater to the obtained energization rate,
In the energization rate setting, the energization rate setting for the freezer, and the energization rate setting for the refrigerator in which the energization rate different from the energization rate setting for the freezer is defined for the difference between the internal temperature and the outside air temperature. And
The said control part is the cooling storage store | warehouse | chamber which switches to the energization rate setting for the said freezer when the said set temperature in a store | warehouse | chamber is less than the said reference temperature, and switches to the energization rate setting for the said refrigerator when it is more than the said reference temperature. It is a cooling storage that can be used as a freezer or a refrigerator,
A cooler having a compressor with a variable rotational speed;
A setting accepting unit that accepts the setting of the set temperature in the refrigerator in the range from the freezing area to the refrigerated area;
A control unit for controlling the cooling storage;
An internal temperature sensor for detecting the internal temperature ,
With
The compressor control system includes:
A control system for a freezer that rotates at a rotation speed at which the internal temperature is maintained at the internal set temperature when the internal temperature decreases to the internal set temperature,
The internal temperature detected by the internal temperature sensor is rotated at a rotational speed at which the internal temperature decreases below the internal set temperature even if the internal temperature decreases to the internal set temperature, and the internal temperature detected by the internal temperature sensor is the internal set temperature. When the temperature drops below the first temperature, the rotation is stopped or the rotation speed is slowed, and when the internal temperature rises above the second temperature with respect to the internal set temperature, the rotation is resumed. When,
There is
The control unit switches the control method of the compressor to the control method for the freezer when the set temperature in the refrigerator is lower than the reference temperature near 0 ° C. , and the control method for the refrigerator when the control temperature is equal to or higher than the reference temperature. Switch to the cooling storage. The cooling storage according to claim 4 ,
An internal fan that circulates the cool air cooled by the cooler into the refrigerator, and includes an internal fan that can switch the rotation speed between a low speed and a high speed,
The control system of the internal fan includes
A control method for a freezer that rotates at a high speed until the internal temperature decreases to the internal set temperature, and rotates at a low speed when the internal temperature decreases to the internal set temperature,
Rotate at high speed until the compressor stops, stop the internal fan while the compressor is stopped, or rotate at low speed, and rotate at high speed when rotation of the compressor is resumed A control system for the refrigerator,
There is
When the control unit switches the control method of the compressor to the control method for the freezer, the control method of the internal fan is also switched to the control method for the freezer, and the control method of the compressor is changed to the freezer control method. When the control method is switched to the cooling storage, the storage fan control method is switched to the refrigerator control method.

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