Refrigerating and freezing device and control method thereof

Abstract

The present application relates to a refrigeration and freezing device and a control method thereof, the refrigeration and freezing device comprising a cabinet defining a freezing compartment, a freezing fan for driving air into the freezing compartment, and a compression refrigeration system having a compressor. The control method comprises: when the refrigeration and freezing device reaches a preset automatic shutdown condition, obtaining the humidity in the freezing compartment; if the humidity in the freezing compartment is higher than or equal to a preset maximum humidity, controlling the compressor and the freezing fan to stop running; if the humidity in the freezing compartment is lower than the preset maximum humidity, increasing the humidity in the freezing compartment to the preset maximum humidity and then controlling the compressor and the freezing fan to stop running. The present application increases the humidity in the freezing compartment to the preset maximum humidity before the refrigeration and freezing device is stopped. Thus, the humidity in the freezing compartment can be maintained at a higher level of the preset maximum humidity during the shutdown, and the effect of food preservation is not affected by the low humidity in 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.

[0003] Existing technologies for humidifying freezer compartments typically involve adding highly complex humidification devices within the refrigeration unit. However, the low temperature in freezers makes these humidification devices prone to condensation and blockage, and they also occupy space in air ducts or compartments. Therefore, these existing solutions not only increase the cost and assembly complexity of refrigeration units but are also difficult to implement in practice, failing to effectively solve the problem of low humidity in freezers. Summary of the Invention

[0004] One objective 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 that can maintain a high level of humidity in the freezer compartment during downtime.

[0005] 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.

[0006] The second aspect of the present invention is to provide a refrigeration and freezing apparatus capable of maintaining a high level of humidity in the freezer compartment during downtime.

[0007] 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 having a compressor; the control method comprising:

[0008] When the refrigeration and freezing device reaches the preset automatic shutdown condition, the humidity inside the freezing room is obtained;

[0009] If the humidity inside the freezer room is higher than or equal to the preset maximum humidity, the compressor and the freezer fan will be stopped.

[0010] If the humidity inside the freezer room is lower than the preset maximum humidity, the humidity inside the freezer room will be increased to the preset maximum humidity before the compressor and the freezer fan will be stopped.

[0011] Optionally, the compression refrigeration system includes a refrigeration branch connected in series with the compressor, the refrigeration branch including a refrigeration evaporator and a refrigeration throttling device;

[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 step of increasing the humidity in the freezer room to the preset maximum humidity includes:

[0014] The refrigeration fan is kept running, and the compressor is controlled to operate at a frequency lower than the first set frequency when it is in the refrigeration state of the refrigeration room, so that the evaporator temperature of the refrigeration evaporator is higher than the room temperature inside the refrigeration room.

[0015] Optionally, the housing further defines at least one non-freezing compartment, and the compression refrigeration system further includes a refrigeration branch connected in series with the compressor. The refrigeration branch includes a refrigeration evaporator and a refrigeration throttling device. At least one non-freezing branch is connected in parallel at both ends of the refrigeration throttling device for providing cooling capacity to the at least one non-freezing compartment. 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 step of increasing the humidity in the freezer room to the preset maximum humidity includes:

[0018] Control the switching valve to switch to the state where the refrigeration throttling device is activated;

[0019] Start the refrigeration fan;

[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, so that the evaporator temperature of the freezer evaporator is higher than the compartment temperature inside the freezer compartment.

[0021] Optionally, controlling the compressor to operate at a frequency lower than its first set frequency when in the refrigeration state of the freezer compartment, so that the evaporator temperature of the freezer evaporator is higher than the compartment temperature inside the freezer compartment, includes:

[0022] 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;

[0023] Obtain the evaporator temperature of the freezer evaporator and the compartment temperature inside the freezer chamber;

[0024] Calculate the temperature difference between the evaporator temperature and the compartment temperature;

[0025] If the temperature difference between the evaporator temperature and the compartment temperature is greater than or equal to the preset minimum temperature difference, the compressor operating frequency remains unchanged, and the process returns to continue acquiring the humidity inside the freezer compartment.

[0026] 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 process returns to continuously acquiring the evaporator temperature of the freezer evaporator and the compartment temperature within the freezer compartment; wherein

[0027] The preset minimum temperature difference is greater than zero.

[0028] Optionally, the preset minimum temperature difference is any temperature difference value within the range of 2 to 4°C.

[0029] Optionally, the operating frequency of the compressor decreases by the same amount each time.

[0030] Optionally, the operating frequency of the compressor may be reduced by an increment of 2 to 20 Hz each time.

[0031] Optionally, the preset maximum humidity is any relative humidity value between 80% and 100%.

[0032] Optionally, the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device reaches its respective set temperature.

[0033] 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:

[0034] 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.

[0035] The control method of this invention does not immediately stop the compressor and refrigeration fan when the refrigeration and freezing unit reaches the preset automatic shutdown conditions. Instead, it raises the humidity in the freezer compartment to the preset maximum humidity before stopping the compressor and refrigeration fan. In other words, the humidity in the freezer compartment is raised to the preset maximum humidity before the refrigeration and freezing unit is shut down. After shutdown, the humidity in the freezer compartment no longer decreases and may even rise slowly. Therefore, during shutdown, the humidity in the freezer compartment can be maintained at a relatively high level of the preset maximum humidity, avoiding the negative impact of low humidity on food preservation.

[0036] Furthermore, this invention obtains the evaporator temperature of the freezer evaporator and the compartment temperature inside the freezer, monitors the temperature difference between the evaporator temperature and the compartment temperature, and gradually and slowly reduces the operating frequency of the compressor so that the evaporator temperature of the freezer evaporator is greater than the compartment temperature inside the freezer. This not only keeps the external water vapor entering the freezer compartment through the door seal, the moisture inside the freezer compartment (such as the moisture evaporated from the food), and the moisture sublimated from the frost on the freezer evaporator inside the freezer compartment, thereby increasing the humidity inside the freezer compartment, but also avoids the temperature rise of the freezer evaporator from being too high due to a one-time reduction in the compressor operating frequency, which would have a significant impact on the temperature of the freezer compartment.

[0037] 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

[0038] 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:

[0039] Figure 1 This is a schematic structural diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention;

[0040] 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] 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;

[0042] Figure 4 This is a schematic flowchart illustrating how to increase the humidity in a freezer room to a preset maximum humidity according to an embodiment of the present invention.

[0043] Figure 5This is a schematic flowchart of a control method for a refrigeration and freezing apparatus according to another embodiment of the present invention;

[0044] Figure 6 This is a schematic structural block diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention. Detailed Implementation

[0045] 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.

[0046] 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 having a compressor 21. Further, the compression refrigeration system 20 includes a refrigeration branch and a condenser 29 connected in series with the compressor 21. The refrigeration branch includes a refrigeration evaporator 22 and a refrigeration throttling device 23. Specifically, the refrigeration throttling device 23 can be a capillary tube or a throttling valve, etc.

[0047] 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 freezer compartment 11 condenses at the freezer evaporator 22, inevitably reducing the humidity inside. When the freezer compartment 11 reaches the set temperature and shuts off, the temperature inside is almost at its lowest point. Although the humidity inside freezer compartment 11 slowly rises after shutdown, the rate of increase is slow, and the food inside remains in a low-humidity environment for an extended period, resulting in poor preservation quality.

[0048] Based on the above understanding, the present invention specifically proposes a control method for a refrigeration and freezing device, the control method comprising:

[0049] When the refrigeration and freezing unit 1 reaches the preset automatic shutdown conditions, the humidity inside the freezer compartment 11 is obtained;

[0050] If the humidity in the freezer compartment 11 is higher than or equal to the preset maximum humidity, the compressor 21 and the freezer fan 31 will stop running; that is, when the humidity in the freezer compartment 11 is higher than or equal to the preset maximum humidity, the machine will stop directly.

[0051] If the humidity in the freezer compartment 11 is lower than the preset maximum humidity, the humidity in the freezer compartment 11 will be increased to the preset maximum humidity before the compressor 21 and the freezer fan 31 will stop running.

[0052] The control method of this invention does not immediately stop the compressor 21 and the refrigeration fan 31 when the refrigeration and freezing device 1 reaches the preset automatic shutdown conditions. Instead, it raises the humidity in the freezer compartment 11 to the preset maximum humidity before stopping the compressor 21 and the refrigeration fan 31. In other words, the humidity in the freezer compartment 11 is raised to the preset maximum humidity before the refrigeration and freezing device 1 is shut down. After shutdown, the humidity in the freezer compartment 11 no longer decreases, and may even rise slowly. Therefore, during shutdown, the humidity in the freezer compartment 11 can be maintained at a relatively high level of the preset maximum humidity, avoiding the impact of low humidity in the freezer compartment 11 on the food preservation effect after shutdown.

[0053] 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.

[0054] 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 freezer compartment 11 by controlling the shutdown time and operating frequency of the compressor 21, without the need to add 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.

[0055] 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:

[0056] 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.

[0057] Step S20: Obtain the humidity inside the freezer compartment 11;

[0058] Step S30: Determine whether the humidity in the freezer compartment 11 is lower than the preset maximum humidity. If yes, proceed to step S40; otherwise, proceed to step S50.

[0059] Step S40: Increase the humidity in the freezer compartment 11 to the preset maximum humidity;

[0060] In step S50, the compressor 21 and the refrigeration fan 31 are stopped.

[0061] In some embodiments, the refrigeration and freezing unit 1 is in the freezing compartment cooling state before the automatic shutdown condition is reached; in the freezing compartment 11 cooling state, the refrigeration fan 31 is in the running state, and the refrigerant flows through the freezing evaporator 22 and the freezing throttling device 23.

[0062] Specifically, if the refrigeration and freezing unit 1 only includes the freezer compartment 11, then the refrigeration and freezing unit 1 will necessarily be in the freezer compartment cooling state before the automatic shutdown condition is met.

[0063] If the refrigeration and freezing unit 1 includes at least one non-freezing compartment in addition to the freezing compartment 11, such as a refrigeration compartment and a variable temperature compartment, then the refrigeration and freezing unit 1 typically operates in the order of refrigeration of the refrigeration compartment, cooling of the variable temperature compartment, and cooling of the freezing compartment. That is, when the freezing compartment begins to cool, the refrigeration of the refrigeration compartment and the cooling of the variable temperature compartment have usually already been completed; in other words, the refrigeration and freezing unit 1 is usually in the freezing compartment cooling state before the automatic shutdown condition is reached.

[0064] In these embodiments, step S40, which raises the humidity in the freezer compartment 11 to a preset maximum humidity, may specifically include:

[0065] Keep the refrigeration fan 31 running and control the compressor 21 to operate at a frequency lower than the first set frequency when it is in the refrigeration state of the refrigeration room, so that the evaporator temperature of the refrigeration evaporator 22 is higher than the room temperature in the refrigeration room 11.

[0066] When the refrigeration fan 31 operates, it causes airflow to circulate between the evaporator 22 and the freezer compartment 11. Since the evaporator temperature of the evaporator 22 is higher than the compartment temperature of the freezer compartment 11, external water vapor entering the freezer compartment 11 through the door seal, moisture in the freezer compartment 11 (such as moisture evaporated from food), and moisture formed by the sublimation of frost on the evaporator 22 will condense in the lower-temperature freezer compartment 11 instead of condensing at the evaporator 22. This effectively increases the moisture content in the freezer compartment 11, thereby raising the humidity in the freezer compartment 11 to the preset maximum humidity.

[0067] In some embodiments, the housing 10 further defines at least one non-freezing compartment, and the compression refrigeration system 20 further includes a refrigeration branch connected in series with the compressor 21. The refrigeration branch includes a refrigeration evaporator 21 and a refrigeration throttling device 23. At least one non-freezing branch is connected in parallel at both ends of the refrigeration throttling device 23 for providing cooling capacity to at least one non-freezing compartment. The compression refrigeration system 20 further includes a switching valve 24 for activating the refrigeration throttling device 23 and one of the at least one non-freezing branches.

[0068] Specifically, 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.

[0069] In these embodiments, the refrigeration and freezing unit 1 may be in a non-freezing compartment cooling state before the automatic shutdown condition is met; in the non-freezing compartment cooling state, the refrigeration fan 31 is in a stopped state; and the refrigerant flows through the non-freezing branch corresponding to the non-freezing compartment.

[0070] Further, see Figure 4 The schematic flowchart shown below illustrates the process of increasing the humidity in the freezer compartment 11 to a preset maximum humidity according to an embodiment of the present invention. Step S40 of increasing the humidity in the freezer compartment 11 to the preset maximum humidity may specifically include:

[0071] Step S41: Control the switching valve 24 to switch to the state of conducting the refrigeration throttling device 23;

[0072] Step S42: Start the refrigeration fan 31;

[0073] Step S43: 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, so that the evaporator temperature of the freezer evaporator 22 is higher than the compartment temperature in the freezer compartment 11.

[0074] Similarly, the operation of the refrigeration fan 31 can cause airflow to circulate between the evaporator 22 and the freezer compartment 11. Since the evaporator temperature of the evaporator 22 is higher than the compartment temperature inside the freezer compartment 11, external water vapor entering the freezer compartment 11 through the door seal, moisture inside the freezer compartment 11 (such as moisture evaporated from food), and moisture formed by the sublimation of frost on the evaporator 22 will condense in the lower-temperature freezer compartment 11 instead of condensing at the evaporator 22. This can effectively increase the moisture content inside the freezer compartment 11, thereby raising the humidity inside the freezer compartment 11 to the preset maximum humidity.

[0075] Figure 5This is a schematic flowchart of a control method for a refrigeration and freezing apparatus according to another embodiment of the present invention. In some embodiments, the step of controlling the compressor 21 to operate at a frequency lower than its first set frequency when it is in the refrigeration state of the freezer compartment, so that the evaporator temperature of the freezer evaporator 22 is higher than the compartment temperature inside the freezer compartment 11, may specifically include:

[0076] Step S431: 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;

[0077] Step S432: Obtain the evaporator temperature of the freezer evaporator 22 and the compartment temperature inside the freezer compartment 11;

[0078] Step S433: Calculate the temperature difference between the evaporator temperature and the compartment temperature;

[0079] Step S434: 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 S435; if no, proceed to step S436.

[0080] Step S435: Reduce the operating frequency of compressor 21 and return to step S422;

[0081] Step S436: Keep the operating frequency of compressor 21 unchanged and return to step S20.

[0082] Among these, the aforementioned preset minimum temperature difference is greater than zero. That is, it is necessary to ensure that the temperature difference between the evaporator temperature and the compartment temperature is positive, that is, to ensure that the evaporator temperature of the freezer evaporator 22 is greater than the compartment temperature inside the freezer compartment 11.

[0083] This invention obtains the evaporator temperature of the evaporator 22 and the compartment temperature inside the freezer compartment 11, monitors the temperature difference between the evaporator temperature and the compartment temperature, and gradually and slowly reduces the operating frequency of the compressor 21 so that the evaporator temperature of the evaporator 22 is greater than the compartment temperature inside the freezer compartment 11. This not only keeps moisture in the freezer compartment and thus increases the humidity inside the freezer compartment, but also avoids the compressor 21's operating frequency being reduced too much at once, which would cause the temperature of the evaporator 22 to rise too high and have a significant impact on the temperature of the freezer compartment 11.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] In some embodiments, the preset maximum humidity can be any relative humidity value between 80% and 100%. For example, the preset maximum humidity can be 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 98%, or 100%. That is, before shutting down, the humidity in the freezer compartment 11 needs to be raised to a higher level of 80% or more to ensure that the humidity in the freezer compartment 11 is stably maintained at a higher level during shutdown.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] The present invention also provides a refrigeration and freezing apparatus. Figure 6 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 6 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.

[0092] 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.

[0093] Specifically, both compressor 21 and refrigeration fan 31 are connected to control device 40 to operate under the control of control device 40.

[0094] 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.

[0095] When the preset automatic shutdown conditions are met, the refrigeration and freezing device 1 of the present invention does not immediately stop the compressor 21 and the freezing fan 31. Instead, it raises the humidity in the freezer compartment 11 to a preset maximum humidity before stopping the compressor 21 and the freezing fan 31. In other words, the humidity in the freezer compartment 11 is raised to the preset maximum humidity before the refrigeration and freezing device 1 is shut down. After shutdown, the humidity in the freezer compartment 11 no longer decreases, and may even rise slowly. Therefore, during shutdown, the humidity in the freezer compartment 11 can be maintained at a relatively high level of the preset maximum humidity, avoiding the impact of low humidity in the freezer compartment 11 on the food preservation effect after shutdown.

[0096] The refrigeration and freezing device 1 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.

[0097] 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 freezer compartment 11 by controlling the shutdown time and operating frequency of the compressor 21, without the need to add 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.

[0098] 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 1The three-door refrigerator shown can also be a single-door refrigerator, a double-door refrigerator, or other refrigerators with a freezer compartment.

[0099] 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.

[0100] 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 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 having a compressor; the control method comprising: When the refrigeration and freezing device reaches the preset automatic shutdown condition, the humidity inside the freezing room is obtained; If the humidity inside the freezer room is higher than or equal to the preset maximum humidity, the compressor and the freezer fan will be stopped. If the humidity inside the freezer room is lower than the preset maximum humidity, the humidity inside the freezer room will be increased to the preset maximum humidity before the compressor and the freezer fan will stop running. The compression refrigeration system includes a refrigeration branch connected in series with the compressor, and the refrigeration branch includes a refrigeration evaporator and a refrigeration throttling device; 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 the running state; and The step of increasing the humidity in the freezer room to the preset maximum humidity includes: The refrigeration fan is kept running, and the compressor is controlled to operate at a frequency lower than the first set frequency when it is in the refrigeration state of the refrigeration room, so that the evaporator temperature of the refrigeration evaporator is higher than the room temperature inside the refrigeration room.

2. The control method according to claim 1, wherein, The housing further defines at least one non-freezing compartment. The compression refrigeration system also includes a refrigeration branch connected in series with the compressor. The refrigeration branch includes a refrigeration evaporator and a refrigeration throttling device. At least one non-freezing branch is connected in parallel at both ends of the refrigeration throttling device for providing cooling capacity to the at least one non-freezing compartment. The compression refrigeration system also includes a switching valve for connecting the refrigeration throttling device and one of the at least one non-freezing branches. Before the automatic shutdown condition is met, the refrigeration and freezing unit is in a non-freezing compartment cooling state, and in the non-freezing compartment cooling state, the refrigeration fan is in a stopped state. and The step of increasing the humidity in the freezer room to the preset maximum humidity includes: Control the switching valve to switch to the state where the refrigeration throttling device is activated; Start the refrigeration fan; 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, so that the evaporator temperature of the freezer evaporator is higher than the compartment temperature inside the freezer compartment.

3. The control method according to claim 1 or 2, wherein, The step of controlling the compressor to operate at a frequency lower than its first set frequency when in the refrigeration state of the freezer compartment, so that the evaporator temperature of the freezer evaporator is higher than the compartment temperature inside the freezer compartment, includes: 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; Obtain the evaporator temperature of the freezer evaporator and the compartment temperature inside the freezer chamber; Calculate the temperature difference between the evaporator temperature and the compartment temperature; If the temperature difference between the evaporator temperature and the compartment temperature is greater than or equal to the preset minimum temperature difference, the compressor operating frequency remains unchanged, and the process returns to continue acquiring the humidity inside the freezer compartment. 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 process returns to continuously acquiring the evaporator temperature of the freezer evaporator and the compartment temperature within the freezer compartment; wherein The preset minimum temperature difference is greater than zero.

4. The control method according to claim 3, wherein, The preset minimum temperature difference is any temperature difference value within the range of 2 to 4℃.

5. The control method according to claim 3, wherein, The compressor's operating frequency decreases by the same amount each time.

6. The control method according to claim 5, wherein, The operating frequency of the compressor is reduced each time by an increment of 2 to 20 Hz.

7. The control method according to claim 1, wherein, The preset maximum humidity is any relative humidity value within the range of 80% to 100%.

8. The control method according to claim 1, wherein, The automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device reaches its respective set temperature.

9. 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: A control device includes a processor and a memory, the memory storing a machine-executable program, which, when executed by the processor, is used to implement the control method according to any one of claims 1-8.

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