Refrigeration and freezing equipment and its control methods

Abstract

This invention relates to a refrigeration and freezing apparatus and its control method. The refrigeration and freezing apparatus includes a cabinet defining a freezing compartment, a refrigeration fan, and a compression refrigeration system. The compression refrigeration system includes a compressor, a refrigeration evaporator connected in series with the compressor, and a refrigeration throttling device. The control method of this invention includes: when the refrigeration and freezing apparatus reaches a preset automatic shutdown condition, controlling the refrigeration fan to stop and controlling the refrigerant flow through the refrigeration throttling device and the refrigeration evaporator; adjusting the operating frequency of the compressor until the temperature difference between the evaporator temperature and the compartment temperature in the freezing compartment is greater than or equal to a preset minimum temperature difference; stopping the compressor and starting the refrigeration fan; and stopping the refrigeration fan after it has been running continuously for a first preset time. This invention increases the humidity in the freezing compartment before shutting down, thereby increasing the average humidity in the freezing compartment without significantly raising the temperature inside the freezing compartment.

Description

Technical Field

[0001] This invention relates to refrigeration and freezing technology, and in particular to a refrigeration and freezing apparatus and its control method. Background Technology

[0002] The humidity level within a refrigeration and freezing system affects the rate at which food moisture evaporates, thus impacting food quality. When humidity is too low, food evaporates moisture quickly, leading to weight loss, poor storage performance, and a shorter shelf life. Therefore, maintaining humidity in refrigeration and freezing systems remains a crucial research topic. However, most current refrigeration and freezing systems humidify the refrigerator compartment, paying little attention to the freezer compartment. In reality, air-cooled refrigeration and freezing systems commonly experience significant humidity fluctuations during freezing and refrigeration. These fluctuations and low humidity levels cause food stored in the freezer to lose moisture, affecting its texture and nutrient content, ultimately impacting the user experience. Summary of the Invention

[0003] One object of the first aspect of the present invention is to overcome at least one deficiency of the prior art and to provide a control method for a refrigeration and freezing apparatus capable of increasing the average humidity inside a freezer compartment.

[0004] A further objective of the first aspect of the present invention is to avoid having a significant impact on the temperature of the freezer compartment.

[0005] The second aspect of the present invention is to provide a refrigeration and freezing device that can increase the average humidity inside a freezer room.

[0006] According to a first aspect of the present invention, the present invention provides a control method for a refrigeration and freezing apparatus, the refrigeration and freezing apparatus comprising a cabinet defining a freezing compartment, a refrigeration fan for driving air into the freezing compartment, and a compression refrigeration system, the compression refrigeration system comprising a compressor, a refrigeration evaporator connected in series with the compressor, and a refrigeration throttling device; the control method comprising:

[0007] When the refrigeration and freezing unit reaches the preset automatic shutdown conditions, the refrigeration fan is controlled to stop, and the refrigerant is controlled to flow through the refrigeration throttling device and the refrigeration evaporator;

[0008] Adjust the operating frequency of the compressor until the temperature difference between the evaporator temperature of the freezer evaporator and the compartment temperature of the freezer room is greater than or equal to a preset minimum temperature difference, wherein the preset minimum temperature difference is greater than zero.

[0009] Stop the compressor and start the refrigeration fan;

[0010] The refrigeration fan will stop after running continuously for a first preset time.

[0011] Optionally, the housing further defines at least one non-freezing compartment, and at both ends of the refrigeration throttling device are connected in parallel at least one non-freezing branch for providing cooling capacity to the at least one non-freezing compartment respectively. The compression refrigeration system further includes a switching valve for connecting the refrigeration throttling device and one of the at least one non-freezing branches.

[0012] Before the automatic shutdown condition is met, the refrigeration and freezing unit is in the freezing compartment cooling state, and in the freezing compartment cooling state, the refrigeration fan is in operation; and

[0013] The steps of controlling the refrigerant flow through the refrigeration throttling device and the refrigeration evaporator include:

[0014] The state of the switching valve remains unchanged.

[0015] Optionally, the housing further defines at least one non-freezing compartment, and at both ends of the refrigeration throttling device are connected in parallel at least one non-freezing branch for providing cooling capacity to the at least one non-freezing compartment respectively. The compression refrigeration system further includes a switching valve for connecting the refrigeration throttling device and one of the at least one non-freezing branches.

[0016] Before the automatic shutdown condition is met, the refrigeration and freezing unit is in a non-freezing compartment cooling state, and in this non-freezing compartment cooling state, the refrigeration fan is stopped; and

[0017] The steps of controlling the refrigerant flow through the refrigeration throttling device and the refrigeration evaporator include:

[0018] Switch the switching valve to the state where the refrigeration throttling device is activated.

[0019] Optionally, the step of adjusting the operating frequency of the compressor until the temperature difference between the evaporator temperature of the freezer evaporator and the compartment temperature of the freezer compartment is greater than or equal to a preset minimum temperature difference includes:

[0020] The compressor is controlled to operate at a frequency lower than a first set frequency when it is in the refrigeration state of the freezer compartment;

[0021] Obtain the evaporator temperature of the freezer evaporator and the compartment temperature inside the freezer chamber;

[0022] Calculate the temperature difference between the evaporator temperature and the compartment temperature;

[0023] If the temperature difference between the evaporator temperature and the compartment temperature is less than the preset minimum temperature difference, the operating frequency of the compressor is reduced, and the compressor continues to acquire the evaporator temperature of the freezer evaporator and the compartment temperature of the freezer compartment until the temperature difference between the evaporator temperature and the compartment temperature is greater than or equal to the preset minimum temperature difference.

[0024] Optionally, the operating frequency of the compressor decreases by the same amount each time.

[0025] Optionally, the operating frequency of the compressor may be reduced by an increment of 2 to 20 Hz each time.

[0026] Optionally, the preset minimum temperature difference is any temperature difference value within the range of 2 to 4°C.

[0027] Optionally, the first preset duration is any duration value between 3 and 10 minutes.

[0028] Optionally, the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device reaches its respective set temperature.

[0029] According to a second aspect of the present invention, the present invention also provides a refrigeration and freezing apparatus, comprising a housing defining a freezing compartment, a refrigeration fan for driving air into the freezing compartment, and a compression refrigeration system having a compressor, the refrigeration and freezing apparatus further comprising:

[0030] A control device includes a processor and a memory, the memory storing a machine-executable program, and the machine-executable program being executed by the processor to implement the control method described in any of the above schemes.

[0031] The control method of this invention does not immediately stop the compressor when the refrigeration and freezing device reaches the preset automatic shutdown conditions. Instead, it first stops the refrigeration fan and adjusts the compressor's operating frequency to ensure that the evaporator temperature of the evaporator is higher than the temperature inside the freezing compartment. Then, it stops the compressor and starts the refrigeration fan, which promotes airflow circulation between the evaporator and the freezing compartment. Because the evaporator temperature is higher than the freezing compartment temperature, external moisture entering the freezing compartment through the door seal, moisture inside the freezing compartment (e.g., moisture evaporated from food), and moisture formed by the sublimation of frost on the evaporator will condense in the lower-temperature freezing compartment instead of at the evaporator. This effectively increases the moisture content and humidity inside the freezing compartment. This invention increases the humidity inside the freezing compartment before shutting down the refrigeration and freezing device. After shutdown, the humidity inside the freezing compartment no longer decreases and may even rise slowly, thus increasing the average humidity inside the freezing compartment and preventing low humidity from affecting food preservation.

[0032] Furthermore, by acquiring the evaporator temperature of the freezer evaporator and the room temperature inside the freezer compartment, and monitoring the temperature difference between the evaporator temperature and the room temperature, the operating frequency of the compressor is gradually and slowly reduced so that the evaporator temperature of the freezer evaporator is greater than the room temperature inside the freezer compartment. This not only effectively increases the humidity inside the freezer compartment, but also avoids excessive temperature rise of the freezer evaporator due to a one-time reduction in the compressor operating frequency, which would have a significant impact on the temperature of the freezer compartment.

[0033] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0034] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0035] Figure 1 This is a schematic structural diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic structural block diagram of a compression refrigeration system of a refrigeration and freezing apparatus according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic flowchart of a control method for a refrigeration and freezing apparatus according to a specific embodiment of the present invention;

[0038] Figure 4 This is a schematic flowchart of a control method for a refrigeration and freezing apparatus according to another specific embodiment of the present invention;

[0039] Figure 5 This is a schematic structural block diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention. Detailed Implementation

[0040] This invention first provides a control method for a refrigeration and freezing device. Figure 1 This is a schematic structural diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention. Figure 2 This is a schematic structural block diagram of a compression refrigeration system of a refrigeration and freezing apparatus according to an embodiment of the present invention.

[0041] See Figure 1 and Figure 2 The refrigeration and freezing apparatus 1 of the present invention includes a housing 10 defining a freezing compartment 11, a refrigeration fan 31 for driving air into the freezing compartment 11, and a compression refrigeration system 20. The compression refrigeration system 20 includes a compressor 21, a condenser 29 connected in series with the compressor 21, a freezing evaporator 22, and a freezing throttling device 23. The freezing evaporator 22 and the freezing throttling device 23 form a freezing branch. Specifically, the freezing throttling device 23 can be a capillary tube or a throttling valve, etc.

[0042] The inventors recognized that during the cooling process of freezer compartment 11, the evaporator temperature of the freezer evaporator 22 must be lower than the compartment temperature of freezer compartment 11 to effectively cool it. Water vapor typically accumulates and condenses at lower temperatures. Therefore, during the cooling process of freezer compartment 11, moisture inside the freezer compartment 11 condenses at the freezer evaporator 22, inevitably reducing the humidity inside. When the freezer compartment 11 reaches its set temperature and shuts off, the temperature is almost at its lowest, further lowering the average humidity. Although the humidity inside freezer compartment 11 slowly rises after shutdown, the rate of increase is slow, leaving the food inside in a low-humidity environment for an extended period, resulting in poor preservation quality.

[0043] The applicant further thought that if the temperature inside the freezer compartment 11 is lower than the temperature of the evaporator at the freezer evaporator 22, then water vapor will accumulate inside the freezer compartment. This principle can be used to effectively increase the humidity inside the freezer compartment 11.

[0044] Based on the above understanding, the present invention specifically proposes a control method for a refrigeration and freezing device, the control method comprising:

[0045] When the refrigeration and freezing unit 1 reaches the preset automatic shutdown conditions, the refrigeration fan 31 is controlled to stop, and the refrigerant is controlled to flow through the refrigeration throttling device 23 and the refrigeration evaporator 22.

[0046] Adjust the operating frequency of compressor 21 until the temperature difference between the evaporator temperature of refrigeration evaporator 22 and the temperature of the compartment in refrigeration compartment 11 is greater than or equal to the preset minimum temperature difference, and the preset minimum temperature difference is greater than zero.

[0047] Stop the operation of compressor 21 and start the refrigeration fan 31;

[0048] The refrigeration fan 31 will stop after running continuously for a first preset time.

[0049] The control method of this invention does not immediately stop the compressor 21 when the refrigeration and freezing device 1 reaches the preset automatic shutdown condition. Instead, it first stops the refrigeration fan 31 to stop the airflow into the freezing compartment 11. Then, it adjusts the operating frequency of the compressor 21 so that the evaporator temperature of the evaporator 22 is higher than the temperature inside the freezing compartment 11. Finally, it stops the compressor 21 and starts the refrigeration fan 31, causing the airflow to circulate between the evaporator 22 and the freezing compartment 11. Because the evaporator temperature of the evaporator 22 is higher than the temperature inside the freezing compartment 11, external moisture entering the freezing compartment 11 through the door seal, moisture inside the freezing compartment 11 (e.g., moisture evaporated from food), and moisture formed by the sublimation of frost on the evaporator 22 will condense in the lower-temperature freezing compartment 11 instead of condensing at the evaporator 22. This effectively increases the moisture content and humidity inside the freezing compartment 11.

[0050] This invention increases the humidity in the freezer compartment 11 before shutting down the refrigeration and freezing device 1. After shutdown, the humidity in the freezer compartment 11 no longer decreases, and may even rise slowly. This increases the average humidity in the freezer compartment 11, preventing low humidity from affecting the food preservation effect.

[0051] Meanwhile, as long as the evaporator temperature of the evaporator 22 is higher than the temperature inside the freezer compartment 11 by a certain value, the refrigeration fan 31 can humidify the freezer compartment 11 when it is running. Therefore, the present invention limits the running time of the refrigeration fan 31, which can effectively increase the humidity inside the freezer compartment 11 without blowing the slightly warmer airflow formed after passing through the evaporator 22 into the freezer compartment 11 for a long time, causing the temperature of the freezer compartment 11 to rise significantly.

[0052] The control method of the present invention adjusts the humidity in the freezer compartment 11 before shutdown, eliminating the need to restart the compressor 21 for humidification after shutdown, thus avoiding damage caused by frequent start-stop of the compressor 21.

[0053] Furthermore, based on the original structure of the refrigeration and freezing device 1, the present invention achieves the purpose of increasing the humidity in the freezing compartment 11 by controlling the start and stop of the refrigeration fan 31 and the stop time and operating frequency of the compressor 21, without adding any auxiliary structures. Therefore, it will not affect the original structure and storage capacity of the refrigeration and freezing device 1, thus improving the feasibility of practical application.

[0054] Figure 3 This is a schematic flowchart of a control method for a refrigeration and freezing apparatus according to a specific embodiment of the present invention. See also: Figure 3 The control method of the present invention includes:

[0055] Step S10: Determine whether the refrigeration and freezing device 1 has reached the preset automatic shutdown condition; if yes, proceed to step S20; if no, return to continue the determination.

[0056] Step S20: Control the refrigeration fan 31 to be in a stopped state;

[0057] Step S30: Control the refrigerant flow through the refrigeration throttling device 23 and the refrigeration evaporator 22;

[0058] Step S40: Adjust the operating frequency of compressor 21 until the temperature difference between the evaporator temperature of freezer evaporator 22 and the temperature of the compartment in freezer compartment 11 is greater than or equal to the preset minimum temperature difference, and the preset minimum temperature difference is greater than zero.

[0059] Step S50: Stop the operation of compressor 21 and start refrigeration fan 31;

[0060] Step S60: Determine whether the continuous running time of the refrigeration fan 31 has reached the first preset duration; if yes, proceed to step S70; if no, return to continue the determination.

[0061] Step S70: Stop the refrigeration fan 31.

[0062] In some embodiments, the housing 10 further defines at least one non-freezing compartment, and the two ends of the refrigeration throttling device 23 are connected in parallel to at least one non-freezing branch for providing cooling capacity to the at least one non-freezing compartment respectively. The compression refrigeration system 20 also includes a switching valve 24 for connecting the refrigeration throttling device 23 and one of the at least one non-freezing branches.

[0063] For example, at least one non-freezing compartment may include a refrigeration compartment 12, and at least one non-freezing branch may include a refrigeration branch for providing cooling capacity to the refrigeration compartment 12. The refrigeration branch includes a refrigeration evaporator 25 and a refrigeration throttling device 26 connected in series. The refrigeration throttling device 26 may be a capillary tube or a throttling valve, etc. At least one non-freezing compartment may also include a variable temperature compartment 13, and at least one non-freezing branch may also include a variable temperature branch for providing cooling capacity to the variable temperature compartment 13. The variable temperature branch includes a variable temperature evaporator 27 and a variable temperature throttling device 28 connected in series. The variable temperature throttling device 28 may be a capillary tube or a throttling valve, etc.

[0064] When the cabinet 10 simultaneously contains a freezer compartment 11, a refrigerator compartment 12, and a variable temperature compartment 13, the refrigeration and freezing unit 1 typically operates in the sequence of refrigerator compartment cooling, variable temperature compartment cooling, and freezer compartment cooling. That is, when freezer compartment cooling begins, refrigerator compartment cooling and variable temperature compartment cooling are usually already completed; in other words, the refrigeration and freezing unit 1 is typically in freezer compartment cooling mode until the automatic shutdown condition is met. It can be understood that when freezer compartment 11 is in cooling mode, the refrigeration fan 31 is running, and the switching valve 24 is in the state of opening the refrigeration throttling device 23, allowing refrigerant to flow through the refrigeration throttling device 23 and the refrigeration evaporator 22, thereby achieving the purpose of cooling freezer compartment 11.

[0065] In these embodiments, step S30, which controls the flow of refrigerant through the refrigeration throttling device 23 and the refrigeration evaporator 22, may specifically include:

[0066] Keep the state of switching valve 24 unchanged.

[0067] In other words, before the automatic shutdown condition is met, the refrigeration and freezing unit 1 is in the freezing compartment cooling state, and the switching valve 24 is already in the state of conducting the freezing throttling device 23. Therefore, after the automatic shutdown condition is met, the state of the switching valve 24 does not need to be changed.

[0068] In other embodiments, the refrigeration and freezing unit 1 may also be in a non-freezing compartment cooling state before the automatic shutdown condition is met, such as in a refrigeration cooling state or a variable temperature cooling state. In the non-freezing compartment cooling state, the refrigeration fan 31 is stopped and does not supply air to the freezing compartment 11, the switching valve 24 is in the state of opening the corresponding non-freezing branch, and no refrigerant flows through the refrigeration throttling device 23.

[0069] In these embodiments, step S30, which controls the flow of refrigerant through the refrigeration throttling device 23 and the refrigeration evaporator 22, may specifically include:

[0070] Switch valve 24 to the state where the refrigeration throttling device 23 is activated.

[0071] In other words, before the automatic shutdown condition is met, when the refrigeration and freezing unit 1 is in the non-freezing compartment cooling state, after the automatic shutdown condition is met, it is necessary to adjust the state of the switching valve 24 so that it is in the state of conducting the freezing throttling device 23, so as to adjust the evaporator temperature of the freezing evaporator 22.

[0072] In some embodiments, step S40, which involves adjusting the operating frequency of the compressor 21 until the temperature difference between the evaporator temperature of the freezer evaporator 22 and the compartment temperature in the freezer compartment 11 is greater than or equal to a preset minimum temperature difference, may specifically include:

[0073] The compressor 21 is controlled to operate at a frequency lower than its first set frequency when it is in the refrigeration state of the freezer compartment;

[0074] Obtain the evaporator temperature of the freezer evaporator 22 and the compartment temperature inside the freezer compartment 11;

[0075] Calculate the temperature difference between the evaporator temperature and the compartment temperature;

[0076] If the temperature difference between the evaporator temperature and the compartment temperature is less than the preset minimum temperature difference, the operating frequency of the compressor 21 is reduced, and the compressor continues to acquire the evaporator temperature of the freezer evaporator 22 and the compartment temperature in the freezer compartment 11 until the temperature difference between the evaporator temperature and the compartment temperature is greater than or equal to the preset minimum temperature difference.

[0077] In other words, by acquiring the evaporator temperature of the evaporator 22 and the compartment temperature inside the freezer compartment 11, and monitoring the temperature difference between the evaporator temperature and the compartment temperature, the operating frequency of the compressor 21 is gradually and slowly reduced so that the evaporator temperature of the evaporator 22 is greater than the compartment temperature inside the freezer compartment 11. This not only effectively increases the humidity inside the freezer compartment 11, but also avoids excessive temperature rise of the evaporator 22 due to a one-time reduction in the operating frequency of the compressor 21, which would have a significant impact on the temperature of the freezer compartment 11.

[0078] Specifically, Figure 4 This is a schematic flowchart of a control method for a refrigeration and freezing apparatus according to another specific embodiment of the present invention. See also... Figure 4 The control method of the present invention includes:

[0079] Step S10: Determine whether the refrigeration and freezing device 1 has reached the preset automatic shutdown condition; if yes, proceed to step S20; if no, return to continue the determination.

[0080] Step S20: Control the refrigeration fan 31 to be in a stopped state;

[0081] Step S30: Control the refrigerant flow through the refrigeration throttling device 23 and the refrigeration evaporator 22;

[0082] Step S41: Control the compressor 21 to operate at a frequency lower than the first set frequency when it is in the refrigeration state of the freezer compartment;

[0083] Step S42: Obtain the evaporator temperature of the freezer evaporator 22 and the compartment temperature inside the freezer compartment 11;

[0084] Step S43: Calculate the temperature difference between the evaporator temperature and the compartment temperature;

[0085] Step S44: Determine whether the temperature difference between the evaporator temperature and the compartment temperature is less than the preset minimum temperature difference; if yes, proceed to step S45; if no, proceed to step S50.

[0086] Step S45: Reduce the operating frequency of compressor 21 and return to step S42;

[0087] Step S50: Stop the operation of compressor 21 and start refrigeration fan 31;

[0088] Step S60: Determine whether the continuous running time of the refrigeration fan 31 has reached the first preset duration; if yes, proceed to step S70; if no, return to continue the determination.

[0089] Step S70: Stop the refrigeration fan 31.

[0090] In some embodiments, the operating frequency of compressor 21 decreases by the same amount each time. That is, the operating frequency of compressor 21 decreases evenly, making control relatively simple.

[0091] Specifically, the operating frequency of compressor 21 can be reduced in increments of 2 to 20 Hz each time, in order to find the operating frequency of compressor 21 that can increase the humidity in the freezer compartment 11 while having the least impact on the temperature inside the freezer compartment 11. For example, the operating frequency of compressor 21 can be reduced by 2 Hz, 4 Hz, 6 Hz, 8 Hz, 10 Hz, 12 Hz, 14 Hz, 16 Hz, 18 Hz, or 20 Hz each time.

[0092] In some embodiments, the preset minimum temperature difference can be any temperature difference value between 2 and 4°C. For example, the preset minimum temperature difference can be 2°C, 2.5°C, 3°C, 3.5°C, or 4°C. That is to say, when the evaporator temperature of the freezer evaporator 22 is 2 to 4°C higher than the temperature inside the freezer compartment 11, not only can a better humidification effect be achieved inside the freezer compartment 11, but it will also not have a significant impact on the temperature inside the freezer compartment 11.

[0093] In some embodiments, the first preset duration can be any value between 3 and 10 minutes. For example, the first preset duration can be 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes. If the value of the first preset duration is too small, that is, the refrigeration fan 31 runs for too short a time, the humidification effect in the freezer compartment 11 will be insignificant; if the value of the first preset duration is too large, that is, the refrigeration fan 31 runs for too long, the temperature in the freezer compartment 11 will rise significantly. Therefore, the present invention sets the first preset duration to any value between 3 and 10 minutes, which can effectively humidify the freezer compartment 11 while avoiding large fluctuations in the temperature in the freezer compartment 11.

[0094] In some embodiments, the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device 1 reaches its respective set temperature.

[0095] Specifically, if the refrigeration and freezing unit 1 only includes a freezing compartment 11, the automatic shutdown condition is that the freezing compartment 11 reaches the set freezing temperature.

[0096] Specifically, if the refrigeration and freezing device 1 includes at least one non-freezing compartment in addition to the freezing compartment 11, such as a refrigeration compartment 12 and a variable temperature compartment 13, then the automatic shutdown condition is that the refrigeration compartment 12 reaches the refrigeration set temperature, the variable temperature compartment 13 reaches the variable temperature set temperature, and the freezing compartment 11 reaches the freezing set temperature.

[0097] The present invention also provides a refrigeration and freezing apparatus. Figure 5 This is a schematic structural block diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention. See also... Figure 1 , Figure 2 and Figure 5 The refrigeration and freezing apparatus 1 of the present invention includes a housing 10 defining a freezing compartment 11, a refrigeration fan 31 for driving air into the freezing compartment 11, and a compression refrigeration system 20 having a compressor 21.

[0098] Specifically, the refrigeration and freezing apparatus 1 also includes a control device 40, which includes a processor 41 and a memory 42. The memory 42 stores a machine-executable program 43, and when the machine-executable program 43 is executed by the processor 41, it is used to implement the control method described in any of the above embodiments.

[0099] Specifically, both compressor 21 and refrigeration fan 31 are connected to control device 40 to operate under the control of control device 40.

[0100] Specifically, processor 41 can be a central processing unit (CPU) or a digital processing unit, etc. Processor 41 sends and receives data via a communication interface. Memory 44 is used to store the program executed by processor 41. Memory 44 can be any medium capable of carrying or storing desired program code in the form of instructions or data structures, and accessible by a computer; it can also be a combination of multiple memories. The aforementioned machine-executable program 43 can be downloaded from a computer-readable storage medium to the corresponding computing / processing device or via a network (e.g., the Internet, local area network, wide area network, and / or wireless network) to a computer or external storage device.

[0101] This invention increases the humidity in the freezer compartment 11 before shutting down the refrigeration and freezing device 1. After shutdown, the humidity in the freezer compartment 11 no longer decreases, and may even rise slowly. This increases the average humidity in the freezer compartment 11, preventing low humidity from affecting the food preservation effect.

[0102] Furthermore, the refrigeration and freezing device 1 of the present invention limits the operating time of the refrigeration fan 31 to a certain extent, which can effectively increase the humidity in the freezer compartment 11, and prevent the slightly warmer airflow formed after passing through the freezer evaporator 22 from being blown into the freezer compartment 11 for a long time, causing the temperature of the freezer compartment 11 to rise significantly.

[0103] Meanwhile, the control method of the present invention adjusts the humidity in the freezer compartment 11 before shutdown, so that the compressor 21 does not need to be restarted for humidification after shutdown, thus avoiding the damage caused by frequent start-stop of the compressor 21.

[0104] Those skilled in the art will understand that the refrigeration and freezing apparatus 1 of the present invention is not limited to [specific type]. Figure 1 The three-door refrigerator shown can also be a single-door refrigerator, a double-door refrigerator, or other refrigerators with a freezer compartment.

[0105] Those skilled in the art should also understand that the refrigeration and freezing apparatus 1 of the present invention includes not only refrigerators, but also freezers, freezers or other refrigeration and freezing apparatuses with at least freezing function.

[0106] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A control method of a refrigerating-freezing appliance, the refrigerating-freezing appliance comprising a cabinet defining a freezing compartment, a freezing fan configured to drive air into the freezing compartment, and a compression refrigeration system comprising a compressor, a freezing evaporator connected in series with the compressor, and a freezing throttling device; the control method comprising: controlling the freezing fan to be in a stop state and controlling refrigerant to flow through the freezing throttling device and the freezing evaporator when the refrigerating-freezing appliance reaches a preset automatic shutdown condition; adjusting a running frequency of the compressor until a temperature difference between an evaporator temperature of the freezing evaporator and a compartment temperature in the freezing compartment is greater than or equal to a preset minimum temperature difference, the preset minimum temperature difference being greater than zero; stopping the running of the compressor and starting the freezing fan; stopping the freezing fan after the freezing fan continuously runs for a first preset time length.

2. The control method according to claim 1, wherein the cabinet further defines at least one non-freezing compartment, both ends of the freezing throttling device are connected in parallel with at least one non-freezing branch for providing cold energy to the at least one non-freezing compartment respectively, and the compression refrigeration system further comprises a switching valve for conducting one of the freezing throttling device and the at least one non-freezing branch; the refrigerating-freezing appliance is in a freezing compartment refrigeration state before reaching the automatic shutdown condition, in which the freezing fan is in a running state; and the step of controlling refrigerant to flow through the freezing throttling device and the freezing evaporator comprises: keeping a state of the switching valve unchanged.

3. The control method according to claim 1, wherein the cabinet further defines at least one non-freezing compartment, both ends of the freezing throttling device are connected in parallel with at least one non-freezing branch for providing cold energy to the at least one non-freezing compartment respectively, and the compression refrigeration system further comprises a switching valve for conducting one of the freezing throttling device and the at least one non-freezing branch; the refrigerating-freezing appliance is in a non-freezing compartment refrigeration state before reaching the automatic shutdown condition, in which the freezing fan is in a stop state; and the step of controlling refrigerant to flow through the freezing throttling device and the freezing evaporator comprises: switching the switching valve to a state of conducting the freezing throttling device.

4. The control method according to claim 1, wherein the step of adjusting the running frequency of the compressor until the temperature difference between the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment is greater than or equal to the preset minimum temperature difference comprises: controlling the compressor to run at a frequency lower than a first set frequency of the compressor in the freezing compartment refrigeration state; obtaining the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment; calculating the temperature difference between the evaporator temperature and the compartment temperature; if the temperature difference between the evaporator temperature and the compartment temperature is less than the preset minimum temperature difference, reducing the running frequency of the compressor, and returning to continue obtaining the evaporator temperature of the freezing evaporator and the compartment temperature in the freezing compartment until the temperature difference between the evaporator temperature and the compartment temperature is greater than or equal to the preset minimum temperature difference.

5. The control method according to claim 4, wherein The magnitude of each decrease in the operating frequency of the compressor is the same.

6. The control method according to claim 5, wherein The operating frequency of the compressor is decreased each time by a magnitude of 2-20 Hz.

7. The control method according to claim 1, wherein The preset minimum temperature difference is any temperature difference value in the range of 2-4°C.

8. The control method according to claim 1, wherein The first preset time length is any time length value in the range of 3-10 min.

9. The control method according to claim 1, wherein The automatic shutdown condition is that the temperature of each storage compartment of the refrigerator-freezer reaches its respective set temperature.

10. A refrigerator-freezer comprising a cabinet defining a freezer compartment, a freezer fan for driving air into the freezer compartment, and a compression refrigeration system having a compressor, the refrigerator-freezer further comprising: a control device comprising a processor and a memory, the memory storing a machine executable program, and the machine executable program, when executed by the processor, operates to implement the control method according to any one of claims 1-9.

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