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, controlling the refrigerant flow through the refrigeration throttling device and the refrigeration evaporator, and controlling the compressor to operate at a preset frequency; when the compressor operates at the preset frequency for a first preset duration, stopping the compressor and starting the refrigeration fan; and stopping the refrigeration fan after it has continuously operated for a second preset duration. This invention pre-sets a lower preset frequency for the compressor, requiring only monitoring of the compressor and refrigeration fan's operating time, thus simplifying the control logic while increasing the average humidity of 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] Another objective of the first aspect of this invention is to simplify the control logic of refrigeration and freezing apparatus.

[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 condition, the refrigeration fan is controlled to stop, the refrigerant is controlled to flow through the refrigeration throttling device and the refrigeration evaporator, and the compressor is controlled to run at a preset frequency, wherein the preset frequency is set such that the evaporator temperature of the refrigeration evaporator is higher than the room temperature inside the refrigeration room.

[0008] When the compressor has been running at the preset frequency for a period of time that reaches the first preset duration, the compressor stops running and the refrigeration fan is started.

[0009] The refrigeration fan will stop after running for a second preset period of time.

[0010] Optionally, the preset frequency is 20 to 90 Hz lower than the first set frequency of the compressor when it is in the refrigeration state of the freezer compartment.

[0011] Optionally, the first preset duration is any duration value between 1 and 10 minutes.

[0012] 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.

[0013] 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

[0014] The steps of controlling the refrigerant flow through the refrigeration throttling device and the refrigeration evaporator include:

[0015] Keep the state of the switching valve unchanged;

[0016] The steps for controlling the refrigeration fan to be in a stopped state include:

[0017] Stop the refrigeration fan.

[0018] 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.

[0019] 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

[0020] The steps of controlling the refrigerant flow through the refrigeration throttling device and the refrigeration evaporator include:

[0021] Switch the switching valve to the state where the refrigeration throttling device is activated;

[0022] The steps for controlling the refrigeration fan to be in a stopped state include:

[0023] The refrigeration fan remains in a stopped state.

[0024] Optionally, the at least one non-freezing compartment includes a refrigeration compartment, and the at least one non-freezing branch includes a refrigeration branch, the refrigeration branch including a refrigeration capillary tube and a refrigeration evaporator connected in series; and / or

[0025] The at least one non-freezing compartment includes a variable temperature compartment, and the at least one non-freezing branch includes a variable temperature branch, which includes a variable temperature capillary and a variable temperature evaporator connected in series.

[0026] Optionally, the second preset duration is any duration value between 3 and 10 minutes.

[0027] Optionally, the automatic shutdown condition is that the temperature of each storage compartment of the refrigeration and freezing device reaches its respective set temperature.

[0028] According to a second aspect of the present invention, the present invention also provides a 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 refrigeration and freezing apparatus further comprising:

[0029] 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.

[0030] Optionally, the housing further defines at least one non-freezing compartment, and 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 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 branch; wherein

[0031] The switching valve is configured to maintain or switch to the state of activating the refrigeration throttling device when the refrigeration and freezing unit reaches a preset automatic shutdown condition.

[0032] The control method of this invention pre-sets a relatively low preset frequency based on experience. When the compressor runs at this preset frequency, the evaporator temperature of the freezer evaporator is higher than the temperature of the freezer compartment. When the refrigeration and freezing unit reaches the preset automatic shutdown condition, the compressor is not stopped immediately. Instead, the refrigeration fan is stopped first, and the compressor runs at the aforementioned preset frequency for a first preset time before being stopped. At this time, the temperature of the freezer evaporator has risen back to at least higher than the temperature of the freezer compartment. Then, the refrigeration fan is started to cause airflow to circulate between the freezer evaporator and the freezer compartment. Therefore, external moisture entering the freezer compartment through the door seal, moisture in the freezer compartment (e.g., moisture evaporated from food), and moisture formed by the sublimation of frost on the freezer evaporator will condense in the lower-temperature freezer compartment instead of condensing at the freezer evaporator. This effectively increases the moisture content and humidity in the freezer compartment. This invention increases the humidity in the freezer compartment before shutting down the refrigeration and freezing unit. After the machine is shut down, the humidity inside the freezer compartment no longer decreases, and may even rise slowly. This allows the freezer compartment to maintain a high humidity level during shutdown, increasing the average humidity inside the freezer compartment and preventing low humidity from affecting the food preservation effect.

[0033] Furthermore, based on experience, the present invention pre-sets a lower preset frequency, so that the operating frequency of the compressor remains constant during humidification. Only the duration of compressor operation at the preset frequency needs to be monitored, which simplifies the control logic.

[0034] 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

[0035] 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:

[0036] Figure 1 This is a schematic structural diagram of a refrigeration and freezing apparatus according to an embodiment of the present invention;

[0037] 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;

[0038] 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;

[0039] Figure 4This 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 the freezer compartment, the evaporator temperature of the freezer evaporator 22 must be lower than the compartment temperature of the freezer compartment 11 to effectively cool it. Water vapor typically accumulates and condenses at lower temperatures. Therefore, during the cooling process, moisture in the freezer compartment 11 condenses at the freezer evaporator 22, inevitably reducing the humidity within the freezer compartment 11. When the freezer compartment 11 reaches its set temperature and the system shuts off, the temperature is almost at its lowest, further lowering the average humidity. Although the humidity in the freezer compartment 11 slowly rises after shutdown, the rate of increase is slow, leaving the food in the freezer compartment 11 in a low-humidity environment for an extended period, resulting in poor preservation quality.

[0043] The applicant further conceived that if the operating frequency of the compressor 21 is reduced to a lower frequency than the first set frequency of the compressor 21 when it is in the refrigeration state of the freezer compartment, the temperature of the evaporator 22 will rise to a higher temperature than that of the freezer compartment 11, and water vapor will accumulate in the freezer compartment 11. This principle can be used to effectively moisturize or increase the humidity in 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 stopped, the refrigerant flows through the refrigeration throttling device 23 and the refrigeration evaporator 22, and the compressor 21 is controlled to operate at a preset frequency. This preset frequency is set such that the evaporator temperature of the refrigeration evaporator 22 is higher than the compartment temperature inside the freezing compartment 11.

[0046] When the compressor 21 has been running at a preset frequency for a set period of time, the compressor 21 stops running and the refrigeration fan 31 is started.

[0047] The refrigeration fan 31 will stop after running for a second preset time.

[0048] The control method of the present invention pre-sets a relatively low preset frequency based on experience. When the compressor 21 runs at this preset frequency, the evaporator temperature of the freezer evaporator 22 is higher than the temperature of the freezer compartment 11. When the refrigeration and freezing unit 1 reaches the preset automatic shutdown condition, the compressor 21 is not stopped immediately. Instead, the refrigeration fan 31 is stopped first, and the compressor 21 is allowed to run at the aforementioned preset frequency for a first preset time before being stopped. At this time, the temperature of the freezer evaporator 22 has risen back to at least higher than the temperature of the freezer compartment 11. Then, by starting the refrigeration fan 31, airflow is circulated between the freezer evaporator 22 and the freezer compartment 11. Therefore, external water vapor entering the freezer compartment 11 through the door seal, moisture in the freezer compartment 11 (e.g., moisture evaporated from food), and moisture formed by the sublimation of frost on the freezer evaporator 22 will condense in the lower-temperature freezer compartment instead of condensing at the freezer evaporator. This effectively increases the moisture content and humidity in the freezer compartment 11.

[0049] 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. Thus, a higher humidity can be maintained in the freezer compartment 11 during shutdown, increasing the average humidity in the freezer compartment 11 and preventing low humidity from affecting the food preservation effect.

[0050] Furthermore, the present invention pre-sets a lower preset frequency based on experience, so that the operating frequency of the compressor is constant during humidification. Only the duration of compressor 21 operating at the preset frequency needs to be monitored, which simplifies the control logic.

[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, after the compressor 21 runs at a preset frequency for a first preset time, the present invention starts the refrigeration fan 31 and limits the running time of the refrigeration fan 31. This 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, which would cause 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] This invention achieves the purpose of increasing the humidity in the freezer compartment 11 by controlling the running time of the refrigeration fan 31 and the compressor 21 on the basis of the original structure of the refrigeration and freezing device 1. No auxiliary structure needs to be added. 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, control the refrigerant to flow through the refrigeration throttling device 23 and the refrigeration evaporator 22, and control the compressor 21 to run at a preset frequency;

[0057] Step S30: Determine whether the compressor 21 has been running at a preset frequency for a first preset duration; if yes, proceed to step S40; otherwise, return to continue determining.

[0058] Step S40: Stop the operation of compressor 21 and start refrigeration fan 31;

[0059] Step S50: Determine whether the continuous running time of the refrigeration fan 31 has reached the second preset duration; if yes, proceed to step S60; if no, return to continue the determination.

[0060] Step S60: Stop the refrigeration fan 31.

[0061] In some embodiments, the preset frequency is 20 to 90 Hz lower than the first set frequency of the compressor 21 when it is in the refrigeration state of the freezer compartment. For example, the preset frequency may be 20 Hz, 30 Hz, 40 Hz, 50 Hz, 60 Hz, 70 Hz, 80 Hz or 90 Hz lower than the first set frequency.

[0062] Specifically, when the refrigeration and freezing unit 1 is in the freezing compartment cooling state, the compressor 21 operates at a first set frequency. When the refrigeration and freezing unit 1 reaches the automatic shutdown condition, the compressor 21 operates at a preset frequency of 20 to 90 Hz lower than the first preset frequency, which can ensure that the evaporator temperature of the freezer evaporator 22 is higher than the compartment temperature of the freezing compartment 11.

[0063] Understandably, the preset frequency should not be too low or too high. If the preset frequency is too low, the evaporator temperature of the freezer evaporator 22 will be too high. When the freezer fan 31 is running, the high-temperature airflow will be blown into the freezer compartment 11, causing the temperature of the freezer compartment 11 to rise significantly, affecting the preservation of food. If the preset frequency is too high, the evaporator temperature of the freezer evaporator 22 will be too low, and it cannot be ensured that the evaporator temperature is higher than the temperature of the freezer compartment 11, thus failing to effectively humidify the freezer compartment 11.

[0064] In some embodiments, the first preset duration can be any duration value between 1 and 10 minutes. For example, the first preset duration can be 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes.

[0065] The compressor 21 operates at a preset frequency for 1 to 10 minutes, ensuring that the evaporator temperature of the evaporator 22 rises above the temperature of the freezer compartment 11, thereby effectively humidifying the freezer compartment 11 when the refrigeration fan 31 starts running. If the compressor 21 operates at the preset frequency for too short a time, the evaporator temperature of the evaporator 22 may not rise enough; if the compressor 21 operates at the preset frequency for too long, energy consumption will be wasted.

[0066] 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.

[0067] 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.

[0068] 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.

[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] Keep the state of switching valve 24 unchanged.

[0071] The steps for controlling the refrigeration fan 31 to be in a stopped state include:

[0072] Stop the refrigeration fan 31.

[0073] In other words, before the automatic shutdown condition is met, the refrigeration and freezing unit 1 is in the freezing compartment cooling state, the switching valve 24 is already in the state of conducting the freezing throttling device 23, and the refrigeration fan 31 is in the running state. Therefore, after the automatic shutdown condition is met, the state of the switching valve 24 does not need to be changed, and it is only necessary to stop the refrigeration fan 31.

[0074] 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.

[0075] 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:

[0076] Switch valve 24 to the state where the refrigeration throttling device 23 is activated.

[0077] The steps for controlling the refrigeration fan 31 to be in a stopped state include:

[0078] Keep the refrigeration fan 31 in a stopped state.

[0079] In other words, before the automatic shutdown condition is met, when the refrigeration unit 1 is in the non-freezing compartment cooling state, the refrigeration fan 31 is already stopped, and the switching valve 24 is connected to the non-freezing branch. Therefore, after the automatic shutdown condition is met, it is not necessary to change the state of the refrigeration fan 31; it is only necessary to adjust the state of the switching valve 24 to connect the refrigeration throttling device 23, so as to regulate the evaporator temperature of the refrigeration evaporator 22.

[0080] In some embodiments, the second preset duration can be any value between 3 and 10 minutes. For example, the second 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 second 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 second 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 second 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] The present invention also provides a refrigeration and freezing apparatus. Figure 4 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 4 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 refrigeration evaporator 22 connected in series with the compressor 21, and a refrigeration throttling device 23.

[0085] 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.

[0086] Specifically, both compressor 21 and refrigeration fan 31 are connected to control device 40 to operate under the control of control device 40.

[0087] 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.

[0088] The refrigeration and freezing apparatus 1 of the present invention increases the humidity in the freezer compartment 11 before shutting down. After shutdown, the humidity in the freezer compartment 11 no longer decreases, and may even rise slowly. Thus, a high humidity can be maintained in the freezer compartment 11 during shutdown, increasing the average humidity in the freezer compartment 11 and preventing the low humidity in the freezer compartment 11 from affecting the food preservation effect.

[0089] Furthermore, the present invention pre-sets a lower preset frequency based on experience, so that the operating frequency of the compressor is constant during humidification. Only the duration of compressor 21 operating at the preset frequency needs to be monitored, which simplifies the control logic.

[0090] 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, after the compressor 21 runs at a preset frequency for a first preset time, the present invention starts the refrigeration fan 31 and limits the running time of the refrigeration fan 31. This 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, which would cause the temperature of the freezer compartment 11 to rise significantly.

[0091] 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.

[0092] In some embodiments, the housing 10 further defines at least one non-freezing compartment, and at least one non-freezing branch is connected in parallel at both ends of the refrigeration throttling device 23 for providing cooling capacity to the at least one non-freezing compartment. The compression refrigeration system 20 also includes a switching valve 24 for activating the refrigeration throttling device 23 and one of the at least one non-freezing branch. The switching valve 24 is configured to controllably maintain or switch to the state of activating the refrigeration throttling device 23 when the refrigeration unit 1 reaches a preset automatic shutdown condition.

[0093] 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.

[0094] 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.

[0095] 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 and freezing appliance, the refrigerating and freezing appliance comprising a cabinet defining a freezing compartment, a freezing fan for driving 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: when the refrigerating and freezing appliance reaches a preset automatic shutdown condition, controlling the freezing fan to be in a stop state, controlling refrigerant to flow through the freezing throttling device and the freezing evaporator, and controlling the compressor to operate at a preset frequency, wherein the preset frequency is set such that an evaporator temperature of the freezing evaporator is higher than a compartment temperature in the freezing compartment; after a time length that the compressor operates at the preset frequency reaches a first preset time length, stopping the operation of the compressor, and starting the freezing fan; stopping the freezing fan after the freezing fan continuously operates for a second preset time length. 2.The control method of claim 1, wherein: the preset frequency is 20-90 Hz lower than a first set frequency of the compressor in a freezing compartment refrigeration state. 3.The control method of claim 1, wherein: the first preset time length is any time length value ranging between 1-10 min.

4. 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; before reaching the automatic shutdown condition, the refrigerating and freezing appliance is in a freezing compartment refrigeration state, in which the freezing fan is in an operating state; and the step of controlling refrigerant to flow through the freezing throttling device and the freezing evaporator comprises: keeping the state of the switching valve unchanged; the step of controlling the freezing fan to be in a stop state comprises: stopping the freezing fan.

5. 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; before reaching the automatic shutdown condition, the refrigerating and freezing appliance is in a non-freezing compartment refrigeration state, 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; the step of controlling the freezing fan to be in a stop state comprises: keeping the stop state of the freezing fan unchanged. 6.The control method of claim 4 or 5, wherein The at least one non-freezing compartment includes a refrigerating compartment, and the at least one non-freezing branch includes a refrigerating branch, the refrigerating branch including a refrigerating capillary tube and a refrigerating evaporator connected in series; and / or The at least one non-freezing compartment includes a variable-temperature compartment, and the at least one non-freezing branch includes a variable-temperature branch, the variable-temperature branch including a variable-temperature capillary tube and a variable-temperature evaporator connected in series.

7. The control method of claim 1, wherein The second preset time length is any time length value ranging from 3 to 10 minutes.

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

9. A refrigerating 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 including a compressor, a freezing evaporator and a freezing throttling device connected in series with the compressor, the refrigerating and freezing device further comprising: a control device including a processor and a memory, the memory storing a machine executable program, and the machine executable program, when executed by the processor, is configured to implement the control method of any one of claims 1-8.

10. The refrigerating and freezing device of claim 9, wherein The cabinet further defines at least one non-freezing compartment, and the freezing throttling device has at least one non-freezing branch connected in parallel at both ends thereof for providing cold energy to the at least one non-freezing compartment, respectively, the compression refrigeration system further including a switching valve for conducting one of the freezing throttling device and the at least one non-freezing branch; wherein The switching valve is configured to be controlled to remain or switch to a state of conducting the freezing throttling device when the refrigerating and freezing device reaches a preset automatic shutdown condition.

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