CN114502902A

CN114502902A - Refrigerator, refrigeration control method, and program

Info

Publication number: CN114502902A
Application number: CN202080069861.9A
Authority: CN
Inventors: 儿玉拓也; 小林史典; 诹访孝典
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2019-10-08
Filing date: 2020-10-02
Publication date: 2022-05-13
Anticipated expiration: 2040-10-02
Also published as: JP7154435B2; JPWO2021070758A1; CN114502902B; WO2021070758A1

Abstract

The refrigerator is provided with: a refrigerating circuit for refrigerating a storage chamber for storing articles; a control device (201) for controlling the refrigeration loop; temperature sensors (202, 203) that measure the air temperature of the storage chamber; and a temperature sensor (204) measuring the air temperature of a refrigerator comprised by the refrigeration loop. When the air temperature in the storage chamber is higher than a set temperature, the control device (201) increases the rotation speed of at least one of the compressor (40) and the fan (30) included in the refrigeration circuit every time the temperature difference between the air temperature in the storage chamber and the temperature of the refrigerator reaches a reference temperature difference from a direction larger than the predetermined reference temperature difference.

Description

Refrigerator, refrigeration control method, and program

Technical Field

The invention relates to a refrigerator, a refrigeration control method and a program.

Background

In general, after a heat load such as food is put into a household refrigerator, the cooling capacity, that is, the rotational speed of a compressor and a fan is appropriately adjusted according to the magnitude of the heat load in order to maintain the temperature in the refrigerator.

For example, in the refrigerator described in patent document 1, the rotation speed of the compressor is changed according to the difference between the temperature in the refrigerator and the set temperature.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 60-71874

Disclosure of Invention

However, in the method Of adjusting the cooling capacity only in accordance with the temperature in the refrigerator as in the conventional refrigerator, there is a problem that the COP (Coefficient Of Performance) is poor, excessive cooling, that is, excessive increase in the rotation speed Of the compressor and the fan is caused, and power is consumed more than necessary.

The present invention has been made to solve the above-described problems, and an object thereof is to provide a refrigerator and the like that can be operated at low power while suppressing excessive cooling.

In order to achieve the above object, the present invention provides a refrigerator including:

a refrigerating unit for refrigerating a storage chamber for storing articles;

a control unit controlling the refrigeration unit;

a storage chamber temperature sensor measuring an air temperature of the storage chamber; and

a refrigerator temperature sensor to measure a temperature of a refrigerator included in the refrigeration unit,

the control unit increases the rotation speed of at least one of the compressor and the air supply fan included in the cooling unit when the temperature difference between the air temperature in the storage chamber and the temperature of the refrigerator reaches the reference temperature difference from a direction larger than the predetermined reference temperature difference when the air temperature in the storage chamber is higher than the set temperature.

According to the present invention, excessive cooling can be suppressed, and the refrigerator can be operated at low power.

Drawings

Fig. 1 is a front view of a refrigerator according to embodiment 1 of the present invention.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a diagram showing the configuration of a refrigeration circuit in the refrigerator according to embodiment 1.

Fig. 4 is a block diagram showing the configuration of a control system of the refrigerator of embodiment 1.

Fig. 5 is a flowchart showing a procedure of cooling control processing executed by a control device provided in the refrigerator according to embodiment 1.

Fig. 6 is a diagram showing changes in the freezing chamber temperature, the refrigerator temperature, and the rotational speed of the compressor when the refrigeration control process of embodiment 1 is executed.

Fig. 7 (a) is a diagram for explaining cooling control according to embodiment 2 of the present invention.

Fig. 8 is a diagram (second) for explaining the cooling control according to embodiment 2 of the present invention.

Fig. 9 is a diagram for explaining a condenser according to another embodiment of the present invention.

(symbol description)

1: a refrigerator; 10: a refrigerating chamber; 11: an ice making chamber; 12: a switching room; 13: a vegetable room; 14: a freezing chamber; 15: a cold air path; 16: a refrigerator chamber; 17: a drain pipe; 18: a machine room; 20: a refrigerator; 30: a fan; 40: a compressor; 50: a condenser; 60: a decompression section; 61: an expansion valve; 62: a capillary tube; 70: a refrigerant pipe; 100: a refrigeration loop; 200: a control system; 201: a control device; 202-204: a temperature sensor.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(embodiment mode 1)

Fig. 1 is a perspective view showing an appearance of a refrigerator 1 according to embodiment 1 of the present invention. Fig. 2 is a sectional view taken along line II-II shown in fig. 1. In the orthogonal coordinate system XYZ shown in fig. 1 and 2, when the door of the refrigerator 1 is set to the front side, the left-right direction is the X-axis direction, the up-down direction is the Z-axis direction, and the direction orthogonal to the X-axis and the Z-axis is the Y-axis direction.

As shown in fig. 1, the refrigerator 1 includes a refrigerating compartment 10, an ice making compartment 11, a switching compartment 12, a vegetable compartment 13, a freezing compartment 14, and the like in this order from above, that is, from the + Z side. Further, vegetable compartment 13 and freezing compartment 14 may be arranged to be exchanged. The refrigerating compartment 10, the vegetable compartment 13, and the freezing compartment 14 are examples of the storage compartment of the present invention.

As shown in fig. 2, refrigerator 1 includes refrigerator compartment 16 connected to refrigerating compartment 10, ice-making compartment 11, switching compartment 12 (not shown in fig. 2), vegetable compartment 13, and freezing compartment 14 by cold air duct 15, and equipment compartment 18 connected to refrigerator compartment 16 by drain duct 17. A refrigerator 20 and a fan 30 are disposed in the refrigerator compartment 16, and machine components including a compressor 40 are disposed in the machine compartment 18. Refrigerator 20 and compressor 40 constitute refrigeration circuit 100 shown in fig. 3, and each of refrigerating room 10, ice making room 11, switching room 12, vegetable room 13, and freezing room 14 is cooled to a temperature at which the room can be refrigerated or frozen.

Fig. 3 is a block diagram showing the structure of the refrigeration circuit 100. The refrigeration circuit 100 is an example of the refrigeration unit of the present invention, and has a configuration in which the compressor 40, the condenser 50, the decompression section 60, and the refrigerator 20 are connected in a ring shape by a refrigerant pipe 70 through which a refrigerant circulates.

The compressor 40 is an example of the compressor of the present invention. The compressor 40 compresses the refrigerant to increase the temperature and pressure. The compressor 40 includes an inverter circuit capable of changing the rotation speed according to the drive frequency. The condenser 50 is a heat exchanger disposed in the machine room 18, and condenses the refrigerant. Specifically, the condenser 50 releases heat from the high-temperature and high-pressure refrigerant sent from the compressor 40 to form a refrigerant in a two-layer state of gas and liquid or an overcooling state (also referred to as a sub-cooling state) at or below a saturation temperature.

The decompression section 60 includes an expansion valve 61 and a capillary tube 62. The decompression section 60 decompresses the refrigerant condensed by the condensation section 50 into a liquid state or a two-phase state of liquid and gas. Refrigerator 20 is an example of a refrigerator of the present invention. Refrigerator 20 exchanges heat between the low-temperature and low-pressure refrigerant sent from decompression unit 60 and the air around refrigerator 20. The refrigerant absorbs heat by heat exchange in the refrigerator 20 to be evaporated, and is sent to the compressor 40. Thereby, the air around the refrigerator 20 is cooled.

Fan 30 in fig. 2 is an example of a blower fan of the present invention, and supplies air around refrigerator 20 cooled by refrigeration circuit 100 to each compartment of refrigerator 1 such as refrigerating compartment 10 and ice making compartment 11 via cold air passage 15.

Next, cooling control in the refrigerator 1 is explained. Fig. 4 is a block diagram showing a control system 200 responsible for the cooling control in the refrigerator 1. The control system 200 includes a control device 201, temperature sensors 202-204, a fan 30, and a compressor 40.

The control device 201 is an example of a control unit of the present invention, and is provided in the machine room 18 of the refrigerator 1, for example. Although not shown, the control device 201 includes a CPU (Central Processing Unit) as a hub, a ROM (Read Only Memory), a RAM (Random Access Memory), a communication interface, and a secondary storage device including a nonvolatile semiconductor Memory that can be Read and written, and centrally controls the control system 200. Examples of the nonvolatile semiconductor Memory that can be Read and written are an EEPROM (Electrically Erasable Programmable Read-Only Memory), a flash Memory, and the like.

In the above, the ROM stores a plurality of firmware and data used in execution of the firmware. The RAM is used as a work area of the CPU. The secondary storage device stores various programs including a program in which processing related to the cooling control is described (hereinafter, referred to as a cooling control program), and data used when the programs are executed.

The temperature sensor 202 is provided in the refrigerating compartment 10, and measures the air temperature of the refrigerating compartment 10 (hereinafter referred to as refrigerating compartment temperature). The temperature sensor 202 is communicably connected to the control device 201 via a communication line. The temperature sensor 202 transmits measurement data (i.e., data indicating the measured temperature of the refrigerating chamber) to the control device 201 in response to a request from the control device 201.

The temperature sensor 203 is provided in the freezing chamber 14, and measures the air temperature of the freezing chamber 14 (hereinafter, referred to as freezing chamber temperature). The temperature sensor 203 is communicably connected to the control device 201 via a communication line. The temperature sensor 203 transmits measurement data (i.e., data indicating the measured freezer temperature) to the control device 201 in response to a request from the control device 201. The

temperature sensors

202, 203 are examples of the storage compartment temperature sensors of the present invention.

The temperature sensor 204 measures the temperature of the refrigerator 20. In detail, the temperature sensor 204 is disposed in close contact with the refrigerator 20, and measures the temperature of the surface of the refrigerator 20 (hereinafter, referred to as refrigerator temperature). The temperature sensor 204 is communicably connected to the control device 201 via a communication line, and transmits data indicating the measured refrigerator temperature to the control device 201 in response to a request from the control device 201. Temperature sensor 204 is an example of a refrigerator temperature sensor of the present invention.

As described above, fan 30 is disposed in refrigerator compartment 16, and supplies air around refrigerator 20 cooled by refrigeration circuit 100 to each compartment of refrigerator 1 such as refrigerating compartment 10 and ice-making compartment 11 via cold air passage 15. The fan 30 is communicably connected to the control device 201 via a communication line, and changes the rotational speed, i.e., the air volume, in accordance with an instruction from the control device 201.

As described above, the compressor 40 is a component of the refrigeration circuit 100, and compresses the refrigerant to increase the temperature and pressure. The compressor 40 is communicably connected to the control device 201 via a communication line, and changes the rotation speed in accordance with a command from the control device 201.

The control system 200 includes, in addition to the above, a damper disposed in the cold air duct 15, a heater for melting frost generated in the refrigerator 20, and the like (both not shown), and the control device 201 appropriately controls these components.

In the refrigerator 1 of the present embodiment, similarly to a general refrigerator, when a heat load is generated in the refrigerator due to opening and closing of a door, storage of articles, or the like, a cooling operation is started so that the temperature in the refrigerator is maintained at a set temperature. Further, the refrigerator 1 of the present embodiment has a feature in that the rotation speeds of the compressor 40 and the fan 30 are adjusted a plurality of times before the temperature in the refrigerator reaches the set temperature after the start of the cooling operation. This feature is explained in detail below.

Fig. 5 is a flowchart showing the sequence of the cooling control process executed by the control device 201. This cooling control process is realized by the CPU of the control device 201 executing a cooling control program stored in the secondary storage device, and is repeatedly executed periodically (for example, every 10 seconds) while the power supply of the refrigerator 1 is on.

In step S101, the control device 201 obtains the refrigerator internal temperature, that is, the refrigerating chamber temperature and the freezing chamber temperature. Specifically, the control device 201 requests the temperature sensor 202 to transmit measurement data, and receives the measurement data (that is, data indicating the measured temperature of the refrigerating chamber) transmitted from the temperature sensor 202 in response to the request, thereby acquiring the temperature of the refrigerating chamber. The control device 201 requests the temperature sensor 203 to transmit measurement data, and receives the measurement data (that is, data indicating the measured freezer temperature) transmitted from the temperature sensor 203 in response to the request, thereby acquiring the freezer temperature.

In step S102, the control device 201 acquires the refrigerator temperature. In detail, the control device 201 requests the temperature sensor 204 to transmit measurement data, receives the measurement data (i.e., data indicating the measured refrigerator temperature) transmitted from the temperature sensor 204 in response to the request, and acquires the refrigerator temperature.

In step S103, control device 201 determines whether the temperature in the refrigerator is higher than a set temperature (also referred to as a target temperature). Specifically, control device 201 determines whether or not the refrigerating room temperature is higher than a temperature preset for refrigerating room 10 (hereinafter referred to as refrigerating room set temperature), and control device 201 determines whether or not the freezing room temperature is higher than a temperature preset for freezing room 14 (hereinafter referred to as freezing room set temperature).

If the result is that the refrigerating room temperature is higher than the refrigerating room set temperature or the freezing room temperature is higher than the freezing room set temperature, the control device 201 determines that the refrigerator internal temperature is higher than the set temperature. In this case (step S103; YES), the control device 201 proceeds to step S104. On the other hand, when the refrigerating room temperature is not higher than the refrigerating room set temperature and the freezing room temperature is not higher than the freezing room set temperature, the control device 201 determines that the refrigerator internal temperature is not higher than the set temperature. In this case (step S103; no), the control device 201 proceeds with the process to step S108.

In step S104, the control device 201 determines whether the compressor 40 is operating. If the compressor 40 is in operation (step S104; yes), the control device 201 proceeds to step S105. On the other hand, if the compressor 40 is not in operation (step S104; no), the process of the control device 201 proceeds to step S107.

In step S105, control device 201 determines whether or not the temperature difference between the freezing chamber temperature and the refrigerator temperature (hereinafter, referred to as freezing chamber-refrigerator temperature difference) reaches a predetermined reference temperature difference. Specifically, when the difference between the freezing-chamber and refrigerator temperatures in the past (that is, in the refrigeration control process before the previous cycle) is larger than the reference temperature difference and the difference between the freezing-chamber and refrigerator temperatures in the present cycle is equal to or smaller than the reference temperature difference, controller 201 determines that the difference between the freezing-chamber and refrigerator temperatures has reached the reference temperature difference. On the other hand, when the conventional freezer-refrigerator temperature difference is equal to or less than the reference temperature difference or the present freezer-refrigerator temperature difference is larger than the reference temperature difference, controller 201 determines that the freezer-refrigerator temperature difference does not reach the reference temperature difference.

In the first determination at step S105, the reference temperature difference is an initial value (for example, 5K (kelvin)). When the operation of the compressor 40 is continued, that is, when the cooling operation is continued, the reference temperature difference is changed so as to be equal to or less than the previous value every time the determination of step S105 becomes yes. For example, the reference temperature difference at the 2 nd time is changed to 5K or less. When the operation of the compressor 40 is stopped, the reference temperature difference is reset to the initial value.

If it is determined that the freezer-to-refrigerator temperature difference does not reach the reference temperature difference (no in step S105), control device 201 ends the cooling control process in this cycle. On the other hand, when it is determined that the freezer-refrigerator temperature difference has reached the reference temperature difference (step S105; yes), control device 201 performs control for increasing the rotation speeds of compressor 40 and fan 30 (step S106). After the process of step S106, the control device 201 ends the cooling control process in this cycle.

In step S107, the controller 201 starts the compressor 40 and the fan 30. The rotational speed of the compressor 40 at this time is determined to be a value at which the refrigerator temperature is higher than the freezer compartment set temperature. The rotation speed of the fan 30 at this time is determined to be a value smaller than the maximum rotation speed.

In step S108, the controller 201 determines whether the compressor 40 is operating. If the compressor 40 is not in operation, i.e., is stopped (step S108; no), the control device 201 ends the cooling control process in this cycle. On the other hand, when the compressor 40 is in operation (step S108; YES), the controller 201 stops the operations of the compressor 40 and the fan 30 (step S109). After the process of step S109, the control device 201 ends the cooling control process in this cycle.

Fig. 6 shows changes in the freezer temperature, the refrigerator temperature, and the rotational speed of the compressor 40 when the above-described cooling control process is executed.

As described above, according to the refrigerator 1 of embodiment 1, during cooling in the refrigerator, the cooling capacity, that is, the rotation speed of the compressor 40 and the rotation speed of the fan 30 are increased every time the temperature difference between the freezing compartment temperature and the refrigerator temperature reaches the predetermined reference temperature difference. Therefore, the refrigerator 1 can be operated at low power while suppressing excessive cooling.

In the cooling control process, the rotational speeds of the compressor 40 and the fan 30 are increased in step S106 each time the temperature difference between the freezer compartment temperature and the refrigerator temperature reaches the reference temperature difference. However, the rotation speed of one or both of the compressor 40 and the fan 30 may be increased according to the conditions. For example, the temperature difference between refrigerating room 10 and refrigerator 20 may be large when the refrigerating room temperature is higher than the refrigerating room set temperature and the freezing room temperature is equal to or lower than the freezing room set temperature, so that only the rotation speed of fan 30 is increased without decreasing the refrigerator temperature, the temperature difference between freezing room 14 and refrigerator 20 may be small when the refrigerating room temperature is equal to or lower than the refrigerating room set temperature and the freezing room temperature is higher than the freezing room set temperature, so that only the rotation speed of compressor 40 is increased to increase the freezing capacity, and the rotation speeds of compressor 40 and fan 30 may be increased to cool freezing room 14 and refrigerating room 10 when the refrigerating room temperature is higher than the refrigerating room set temperature and the freezing room temperature is higher than the freezing room set temperature.

After the start of the cooling operation, the control device 201 may sequentially hold the freezing chamber temperatures periodically acquired from the temperature sensor 203 (more specifically, stored in the secondary storage device in time series), and calculate the cooling rate of the freezing chamber (that is, the amount of decrease in the freezing chamber temperature for each period) during the period in which the compressor 40 is operated at the current rotation speed, each time the determination of step S105 becomes yes. Then, the controller 201 may determine a new rotation speed of the compressor 40 in step S106 based on the calculated cooling speed.

In addition, when the temperature difference between the refrigerator internal temperature (freezing chamber temperature or refrigerating chamber temperature) and the refrigerator temperature is extremely large (for example, 20K or more), the controller 201 may increase the rotation speed of the fan 30 (for example, rotate the fan 30 at the maximum rotation speed) regardless of the determination result in step S105.

(embodiment mode 2)

Next, embodiment 2 of the present invention will be described. In the following description, the same reference numerals are given to the components and the like common to those of embodiment 1, and the description thereof will be omitted.

The refrigerator 1 of the present embodiment has the same configuration as that of embodiment 1 (see fig. 1 to 4). The control device 201 of the refrigerator 1 according to the present embodiment executes the cooling control process similar to that of embodiment 1 (see fig. 5).

However, in the refrigerator 1 of the present embodiment, the controller 201 reduces the cooling capacity when the cooling speed (i.e., the temperature gradient during cooling) which is the amount of decrease per unit time of the temperature in the refrigerator is larger than the predetermined upper limit value. Specifically, when the cooling rate of the air temperature of refrigerating room 10, that is, the refrigerating room temperature, is greater than the upper limit value or when the cooling rate of the air temperature of freezing room 14, that is, the freezing room temperature, is greater than the upper limit value, the current rotation speed of compressor 40 is reduced (see fig. 7) and the rotation speed of fan 30 is reduced. The upper limit is, for example, 5K/min.

On the other hand, the controller 201 increases the cooling capacity when the temperature in the refrigerator is higher than the set temperature and the cooling speed is lower than the predetermined lower limit value. Specifically, when the refrigerating room temperature is higher than the refrigerating room set temperature which is the set temperature of the refrigerating room 10 and the cooling rate of the refrigerating room temperature is lower than the lower limit value, or when the freezing room temperature is higher than the freezing room set temperature which is the set temperature of the freezing room 14 and the cooling rate of the freezing room temperature is lower than the lower limit value, the current rotation speed of the compressor 40 is increased (see fig. 8), and the rotation speed of the fan 30 is increased. The lower limit is, for example, 0.2K/min.

As described above, according to the refrigerator 1 of embodiment 2, the cooling capacity, that is, the rotation speed of the compressor 40 and the rotation speed of the fan 30 are adjusted in accordance with the cooling speed of the temperature in the refrigerator, in addition to the cooling control similar to the refrigerator 1 of embodiment 1. Therefore, more appropriate cooling can be performed.

Further, the controller 201 may decrease only the rotation speed of the fan 30 when the cooling speed of the refrigerating chamber temperature is greater than the upper limit value and the cooling speed of the freezing chamber temperature is equal to or less than the upper limit value, decrease only the rotation speed of the compressor 40 when the cooling speed of the refrigerating chamber temperature is equal to or less than the upper limit value and the cooling speed of the freezing chamber temperature is greater than the upper limit value, and decrease the rotation speed of the compressor 40 and the rotation speed of the fan 30 when both the cooling speed of the refrigerating chamber temperature and the cooling speed of the freezing chamber temperature are greater than the upper limit value.

The controller 201 may increase only the rotation speed of the fan 30 when the cooling speed of the refrigerating room temperature is lower than the lower limit value and the cooling speed of the freezing room temperature is equal to or higher than the lower limit value, increase only the rotation speed of the compressor 40 when the cooling speed of the refrigerating room temperature is equal to or higher than the lower limit value and the cooling speed of the freezing room temperature is lower than the lower limit value, and increase the rotation speed of the compressor 40 and the rotation speed of the fan 30 when both the cooling speed of the refrigerating room temperature and the cooling speed of the freezing room temperature are lower than the lower limit value.

A plurality of the upper limit values and the lower limit values may be prepared for each comparison target (cooling rate of the refrigerating chamber temperature, cooling rate of the freezing chamber temperature). The upper limit value and the lower limit value may be fixed values, or may be updated as appropriate by machine learning during operation of the refrigerator 1.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention.

In each of the above embodiments, the condition that the temperature difference between the freezing compartment temperature and the refrigerator temperature reaches the reference temperature difference is to increase the cooling capacity (the rotation speed of the compressor 40 and/or the fan 30). However, the chamber to be subjected to the temperature difference with the refrigerator temperature is not limited to the freezing chamber. For example, when the refrigerating room temperature is higher than the refrigerating room set temperature and the freezing room temperature is equal to or lower than the freezing room set temperature, the cooling capacity may be increased whenever the temperature difference between the refrigerating room temperature and the refrigerator temperature reaches the reference temperature difference, and when the refrigerating room temperature is equal to or lower than the refrigerating room set temperature and the freezing room temperature is higher than the freezing room set temperature, the cooling capacity may be increased whenever the temperature difference between the freezing room temperature and the refrigerator temperature reaches the reference temperature difference.

In addition, when the refrigerating compartment temperature is higher than the refrigerating compartment set temperature and the freezing compartment temperature is higher than the freezing compartment set temperature, the rotation speed of the fan 30 may be increased whenever the temperature difference between the refrigerating compartment temperature and the refrigerator temperature reaches the reference temperature difference, and the rotation speed of the compressor 40 may be increased whenever the temperature difference between the freezing compartment temperature and the refrigerator temperature reaches the reference temperature difference. The reference temperature difference can be set to an appropriate value according to the room (refrigerating room, freezing room) to be measured for the temperature difference from the refrigerator temperature.

Further, a plurality of fans 30 may be disposed. In addition to the fan 30, 1 or more fans for sending air to the condenser 50 may be provided, and the control device 201 may perform the same rotational speed control as the fan 30.

As the condenser constituting the refrigeration circuit 100, a frame heat radiation type condenser may be used in which heat exchange is performed by a side surface of the refrigerator 1, a partition plate of a chamber of the refrigerator 1, or a pipe arranged around the partition plate via a metal plate of the frame as shown in fig. 9, instead of the condenser 50 arranged in the machine chamber 18.

The cooling control in embodiments 1 and 2 may be performed for the purpose of removing the heat load in the refrigerator that occurs after the defrosting operation is performed.

In addition, each chamber of the refrigerator 1 may be set to a freezing chamber if the set temperature is less than 0 ℃, and may be set to a refrigerating chamber if the set temperature is 0 ℃ or higher.

The cooling control program executed by the CPU of the control device 201 included in the refrigerator 1 may be stored in a computer-readable recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD (Digital Versatile Disc), a Magneto-Optical Disc (Magneto-Optical Disc), a USB (Universal Serial Bus) Memory, a Memory card, or an HDD.

Alternatively, the cooling control program may be stored in a storage device provided in another server on the internet, and the cooling control program may be downloaded from the server to the refrigerator 1.

The application is based on Japanese patent application No. 2019-184916 applied on 8/10/2019. The specification, claims and drawings are incorporated herein in their entirety by reference.

Claims

1. A refrigerator is provided with:

a refrigerating unit for refrigerating a storage chamber for storing articles;

a control unit controlling the refrigeration unit;

2. The refrigerator according to claim 1,

the control means determines the rotation speed of the compressor based on a cooling speed, which is a decrease amount per unit time of the air temperature in the storage chamber, when the rotation speed of the compressor is increased.

3. The refrigerator according to claim 1 or 2,

the control means reduces the rotation speed of at least one of the compressor and the blower fan when the cooling speed, which is the amount of decrease per unit time in the air temperature in the storage chamber, is greater than a predetermined upper limit value.

4. The refrigerator according to any one of claims 1 to 3,

the air temperature ratio of control unit at the walk-in the air temperature ratio of walk-in the high air temperature who just the freezer of the settlement temperature of walk-in the air temperature of walk-in only promotes under the condition below the settlement temperature of freezer the rotational speed of air supply fan the air temperature of walk-in does the air temperature ratio of walk-in the air temperature ratio of the below the settlement temperature of walk-in the air temperature ratio of the freezer only promotes under the condition that the settlement temperature of freezer is high the rotational speed of compressor the air temperature ratio of walk-in the air temperature ratio of the freezer promotes under the condition that the settlement temperature of freezer is high the compressor and the rotational speed of air supply fan.

5. A refrigeration control method for controlling refrigeration by a refrigeration unit provided in a refrigerator,

when the air temperature of a storage chamber for storing articles is higher than a set temperature, the rotation speed of at least one of a compressor and an air supply fan included in the refrigeration unit is increased every time the temperature difference between the air temperature of the storage chamber and the temperature of a refrigerator included in the refrigeration unit reaches the reference temperature difference from a direction larger than the predetermined reference temperature difference.

6. The refrigeration control method according to claim 5, wherein,

when the rotation speed of the compressor is increased, the rotation speed of the compressor is determined according to a cooling speed, which is a reduction amount of the air temperature in the storage chamber per unit time.

7. The refrigeration control method according to claim 5 or 6,

when the cooling speed, which is the amount of decrease per unit time in the air temperature in the storage chamber, is greater than a predetermined upper limit value, the rotational speed of at least one of the compressor and the blower fan is decreased.

8. The refrigeration control method according to any one of claims 5 to 7, wherein,

the air temperature ratio at the walk-in the air temperature ratio of walk-in the high air temperature who just freezes of settlement temperature of walk-in the air temperature of freezer does only promote under the condition below the settlement temperature of freezer the rotational speed of air supply fan the air temperature of walk-in does the air temperature ratio of walk-in the air temperature ratio of freezer only promotes under the condition that the settlement temperature of freezer is high the rotational speed of compressor the air temperature ratio of walk-in the air temperature ratio of just the air temperature ratio of freezer promotes under the condition that the settlement temperature of freezer is high the compressor and the rotational speed of air supply fan.

9. A program causes a computer provided in a refrigerator to function as a control unit that raises a rotation speed of at least one of a compressor and an air blowing fan included in a refrigerating unit, when an air temperature in a storage room storing articles is higher than a set temperature, whenever a temperature difference between the air temperature in the storage room and a temperature of the refrigerator included in the refrigerating unit that cools the storage room reaches a reference temperature difference from a direction larger than the predetermined reference temperature difference.

10. The program according to claim 9, wherein,

11. The program according to claim 9 or 10, wherein,

12. The program according to any one of claims 9 to 11,