Refrigerator refrigeration system and refrigerator refrigeration control method

Abstract

The invention relates to a refrigerator refrigeration system and a refrigerator refrigeration control method.In the refrigerator refrigeration system, an outlet of a first throttling component is connected with an inlet of a refrigeration evaporator; a lower liquid outlet of the refrigeration evaporator is connected with the second throttling component; an upper gaseous outlet of the refrigeration evaporator is connected with an electric switching valve; an outlet of the second throttling component is connected with an inlet of the freezing evaporator; an outlet of the freezing evaporator is connected with the electric switching valve; the electric switching valve is also connected with the compressor; the controller is electrically connected with the electric switching valve and the liquid level sensing device. The liquid level sensing device is arranged in the refrigeration evaporator, and the controller is used for controlling the compressor, the first throttling component and the electric switching valve according to the liquid level so as to supply liquid refrigerants and gaseous refrigerants. By means of secondary throttling and gas-liquid separation, the average suction pressure of the refrigerator refrigerating system is improved, so that the refrigerating capacity of the system is improved, the refrigerating efficiency is effectively improved, and the COP is improved.

Description

Technical Field

[0001] The present application relates to the field of refrigerators, and in particular to a refrigerator refrigeration system and a refrigerator refrigeration control method. Background Art

[0002] In existing refrigerator systems, commonly used system modes include single system mode, series-parallel system mode or parallel mode. In single system mode and series-parallel system mode, the suction pressure of the compressor matches the evaporation pressure of the freezer, so the suction pressure is low. In parallel mode, when cooling the refrigerator, the suction pressure of the compressor matches the evaporation pressure of the refrigerator; when cooling the freezer, the suction pressure of the compressor matches the evaporation pressure of the freezer, and the average evaporation pressure is still low.

[0003] Therefore, the suction pressure of the refrigeration system of the current refrigerator is relatively low, resulting in a relatively low coefficient of performance (COP) of the overall system.

[0004] With regard to the problem of low refrigeration performance coefficient of the overall refrigerator refrigeration system in the related art, no effective solution has been proposed so far. Summary of the invention

[0005] In this embodiment, a refrigerator refrigeration system and a refrigerator refrigeration control method are provided to solve the problem of low overall refrigeration performance coefficient of the refrigerator refrigeration system in the related art.

[0006] In a first aspect, a refrigerator refrigeration system is provided in this embodiment, including: a refrigeration evaporator, a freezing evaporator, a compressor, a first throttling component, a second throttling component, a liquid level sensing device, an electric switching valve and a controller; wherein:

[0007] The outlet of the first throttling component is connected to the inlet of the refrigerating evaporator; the lower liquid outlet of the refrigerating evaporator is connected to the second throttling component; the upper gas outlet of the refrigerating evaporator is connected to the electric switching valve; the outlet of the second throttling component is connected to the inlet of the freezing evaporator; the outlet of the freezing evaporator is connected to the electric switching valve; the electric switching valve is also connected to the compressor;

[0008] The controller is electrically connected to the electric switching valve and the liquid level sensing device respectively;

[0009] The liquid level sensing device is arranged in the refrigeration evaporator, and is used to detect the liquid level of the liquid refrigerant after gas-liquid separation in the refrigeration evaporator, and transmit the detected liquid level to the controller;

[0010] The controller is used to control the compressor, the first throttling component and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant.

[0011] In some embodiments, the system further comprises a condenser; an inlet of the condenser is connected to the compressor; and an outlet of the condenser is connected to an inlet of the first throttling component.

[0012] In some of the embodiments, the first throttling component is an expansion valve.

[0013] In some of the embodiments, the second throttling component is a throttling capillary.

[0014] In a second aspect, a refrigerator refrigeration control method is provided in this embodiment, which is used in the refrigerator refrigeration system described in the first aspect above; the method comprises:

[0015] receiving the liquid level of the refrigerant in the refrigeration evaporator detected by the liquid level sensing device;

[0016] According to the liquid level, the compressor, the first throttling component, and the electric switching valve are controlled to provide supply of the liquid refrigerant and the gaseous refrigerant.

[0017] In some embodiments, the compressor, the first throttling component, and the electric switching valve are controlled according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant, including:

[0018] When a cooling request for the cold storage room is received and it is determined that the liquid level is higher than a preset upper limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset first frequency, and the first throttling component is controlled to reduce the flow rate to a preset first flow rate.

[0019] In some embodiments, the controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant includes:

[0020] When a cooling request for the cold storage room is received and it is determined that the liquid level is equal to or lower than the preset upper limit of the liquid level and higher than the preset lower limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to maintain the current flow rate; the second frequency is lower than the first frequency.

[0021] In some embodiments, the controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant includes:

[0022] When a cooling request for the cold storage room is received and it is determined that the liquid level is equal to or lower than the preset lower limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to increase the flow rate to a preset second flow rate; the second flow rate is higher than the first flow rate.

[0023] In some embodiments, the controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant includes:

[0024] When a cooling request for the freezer compartment is received and it is determined that the liquid level is higher than the preset lower limit value of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to maintain the current flow rate.

[0025] In some embodiments, the controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant includes:

[0026] When a cooling request for the freezer compartment is received and it is determined that the liquid level is lower than or equal to the preset lower limit value of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to increase the flow rate to a preset second flow rate; the second flow rate is higher than the first flow rate.

[0027] Compared with the related art, the present embodiment provides a refrigerator refrigeration system and a refrigerator refrigeration control method. The refrigerator refrigeration system improves the average suction pressure of the refrigerator refrigeration system by means of secondary throttling and gas-liquid separation, thereby increasing the system refrigeration capacity and effectively improving the refrigeration efficiency and COP.

[0028] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0030] Figure 1 is a hardware structure block diagram of a terminal of the refrigerator refrigeration control method of this embodiment;

[0031] Figure 2 is a schematic structural diagram of a refrigerator refrigeration system of this embodiment;

[0032] Figure 3 is a flow chart of the refrigerator refrigeration control method of this embodiment;

[0033] Figure 4 is a flow chart of a refrigerator refrigeration control method according to some embodiments. DETAILED DESCRIPTION

[0034] In order to more clearly understand the purpose, technical solutions and advantages of the present application, the present application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meaning understood by people with ordinary skills in the technical field to which this application belongs. The words "one", "a", "a", "the", "these" and the like in this application do not represent quantitative restrictions, and they can be singular or plural. The terms "include", "comprise", "have" and any variants thereof involved in this application are intended to cover non-exclusive inclusions; for example, a process, method and system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent to these processes, methods, products or devices. The words "connect", "connected", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether directly or indirectly. The "multiple" involved in this application refers to two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, "A and / or B" can mean: A exists alone, A and B exist at the same time, and B exists alone. Usually, the character " / " indicates that the objects associated with each other are in an "or" relationship. The terms "first", "second", "third", etc. involved in this application are only used to distinguish similar objects and do not represent a specific ordering of the objects.

[0036] The method embodiment provided in this embodiment can be executed in a terminal, a computer or a similar computing device. For example, running on a terminal, Figure 1 FIG. 1 is a hardware structure block diagram of a terminal of the refrigerator refrigeration control method of this embodiment. Figure 1 As shown, the terminal may include one or more ( Figure 1Only one is shown in the figure) processor 102 and memory 104 for storing data, wherein processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA. The above terminal may also include a transmission device 106 and an input and output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0037] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the refrigerator refrigeration control method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0038] The transmission device 106 is used to receive or send data via a network. The above network includes a wireless network provided by the communication provider of the terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (Radio Frequency, referred to as RF) module, which is used to communicate with the Internet wirelessly.

[0039] In this embodiment, a refrigerator refrigeration system is provided. Figure 2 FIG. 2 is a schematic diagram of the structure of the refrigerator refrigeration system 20 of this embodiment. Figure 2 As shown, the refrigerator refrigeration system 20 includes: a refrigeration evaporator 21, a freezing evaporator 22, a compressor 23, a first throttling component 24, a second throttling component 25, a liquid level sensing device (not shown in the figure), an electric switching valve 27 and a controller (not shown in the figure); wherein:

[0040] The outlet of the first throttling component 24 is connected to the inlet of the refrigerated evaporator 21; the lower liquid outlet of the refrigerated evaporator 21 is connected to the second throttling component 25; the upper gas outlet of the refrigerated evaporator 21 is connected to the electric switching valve 27; the outlet of the second throttling component 25 is connected to the inlet of the frozen evaporator 22; the outlet of the frozen evaporator 22 is connected to the electric switching valve 27; the electric switching valve 27 is also connected to the compressor 23; the controller is electrically connected to the electric switching valve 27 and the liquid level sensing device respectively; the liquid level sensing device is arranged in the refrigerated evaporator 21, and the liquid level sensing device is used to detect the liquid level of the liquid refrigerant after gas-liquid separation in the refrigerated evaporator 21, and transmit the detected liquid level to the controller; the controller is used to control the compressor 23, the first throttling component 24 and the electric switching valve 27 according to the liquid level, so as to provide the supply of liquid refrigerant and gaseous refrigerant.

[0041] Specifically, the refrigerator refrigeration system 20 of this embodiment is set to a two-stage throttling. The refrigerant enters the refrigeration evaporator 21 after being throttled by the first throttling component 24, and refrigerates the refrigeration chamber in the refrigeration evaporator 21. At the same time, the refrigerant completes gas-liquid separation in the refrigeration evaporator 21. The lower part of the refrigeration evaporator 21 is a low-temperature liquid refrigerant, and the upper part is a low-temperature gaseous refrigerant. The gaseous refrigerant returns to the compressor 23 through the upper gaseous outlet of the refrigeration evaporator 21. The liquid refrigerant flows out from the lower liquid outlet of the refrigeration evaporator 21 and passes through the secondary throttling of the second throttling component 25. The temperature and pressure are further reduced, and the refrigeration chamber is cooled, and then it returns to the compressor 23.

[0042] Among them, by throttling the refrigerant, pressure reduction can be achieved. The refrigerant evaporated in the refrigeration evaporator 21 has been converted into a gas state, so it can directly enter the compressor 23 for compression to enter the next refrigeration cycle without secondary throttling. After the liquid refrigerant passes through the secondary throttling of the second throttling component 25, the temperature and pressure are further reduced to refrigerate the freezer compartment, and then enter the compressor 23 to enter the next refrigeration cycle.

[0043] In the related art, commonly used system modes include single system mode, series-parallel system mode or parallel mode. In single system mode and series-parallel system mode, the suction pressure of the compressor matches the evaporation pressure of the freezer, so the suction pressure is low. In parallel mode, when cooling the refrigerator, the suction pressure of the compressor matches the evaporation pressure of the refrigerator; when cooling the freezer, the suction pressure of the compressor matches the evaporation pressure of the freezer, and the average evaporation pressure is still low.

[0044] In this embodiment, when the refrigerator is refrigerated, the higher the temperature of the evaporator is, the greater the evaporation pressure is. In this regard, the refrigeration evaporator temperature is high, so the corresponding evaporation pressure is large; the freezing evaporator temperature is low, so the corresponding evaporation pressure is small. Therefore, in the related art, gas-liquid separation is not performed, the suction pressure will match the freezing evaporation pressure, and the corresponding suction pressure is low. After gas-liquid separation, the suction pressure corresponding to the refrigerant evaporated by the refrigeration will match the refrigeration evaporation pressure, thereby increasing the suction pressure, thereby increasing the average suction pressure of the refrigerator refrigeration system.

[0045] Therefore, compared with the related art, this embodiment improves the average suction pressure of the refrigerator refrigeration system through secondary throttling and gas-liquid separation, thereby increasing the system refrigeration capacity and effectively improving the refrigeration efficiency and COP.

[0046] In this way, this embodiment can reduce the ineffective pressure drop of the refrigerant when cooling the refrigerator compartment, and can also reduce the proportion of gaseous refrigerant after throttling of the freezer compartment, thereby increasing the cooling capacity and cooling efficiency of the refrigerator refrigeration system, and improving the COP of the refrigerator refrigeration system.

[0047] In addition, in this embodiment, a liquid level sensing device for monitoring the liquid refrigerant level is provided in the refrigerated evaporator 21 to realize liquid level monitoring, ensure the refrigerant supply in the refrigerated evaporator 21, and ensure the continuity of operation of the overall system. For example, when the liquid level in the refrigerated evaporator is high, the electric valve switches to the freezer channel, consumes the liquid refrigerant, and the liquid level decreases; when the liquid level is low, the electric valve switches to the refrigerator channel, the compressor draws away the gaseous refrigerant in the refrigerator, and the liquid level rises. In addition, according to the refrigeration needs of the two different compartments, the refrigerator and the freezer, combined with the above-mentioned monitored liquid level, the flow of the first throttling component can be adjusted, the operating frequency of the compressor can be adjusted, and the channel switching of the electric switching valve can be controlled.

[0048] In particular, the controller can be implemented based on a microcontroller unit (MCU). The liquid level sensing device can be implemented based on an ultrasonic liquid level sensor, a radar liquid level sensor or a low temperature resistant capacitive liquid level sensor. This embodiment does not impose any specific restrictions on this.

[0049] In one embodiment, the refrigerator refrigeration system 20 further includes a condenser 29 ; the inlet of the condenser 29 is connected to the compressor 23 ; and the outlet of the condenser 29 is connected to the inlet of the first throttling component 24 .

[0050] Furthermore, in one embodiment, the first throttling component is an expansion valve.

[0051] Additionally, in one embodiment, the second throttling component is a throttling capillary.

[0052] In this embodiment, a refrigerator refrigeration control method is also provided, which is used in the refrigerator refrigeration system provided in the above embodiment. Figure 3 is a flow chart of the refrigerator refrigeration control method of this embodiment, as shown in Figure 3 As shown, the refrigerator refrigeration control method includes the following steps:

[0053] Step S301, receiving the liquid level of the refrigerant in the refrigeration evaporator detected by the liquid level sensing device;

[0054] Step S302, according to the liquid level, the compressor, the first throttling component and the electric switching valve are controlled to provide the supply of liquid refrigerant and gaseous refrigerant.

[0055] Specifically, the controller is connected and communicates with the liquid level sensing device. The controller controls the compressor, the first throttling component and the electric switching valve according to the liquid level sent by the liquid level sensing device, thereby ensuring the supply of liquid refrigerant and gaseous refrigerant in the entire refrigerator refrigeration system to achieve the continuity of the operation of the refrigerator refrigeration system.

[0056] The above steps S301 to S302 can improve the average suction pressure of the refrigerator refrigeration system by means of secondary throttling and gas-liquid separation, thereby increasing the refrigeration capacity of the system and effectively improving the refrigeration efficiency and COP.

[0057] In one embodiment, based on the above step S302, the compressor, the first throttling component and the electric switching valve are controlled according to the liquid level to provide the supply of liquid refrigerant and gaseous refrigerant, which may specifically include:

[0058] When a cooling request for the cold storage room is received and it is determined that the liquid level is higher than the preset upper limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset first frequency, and the first throttling component is controlled to reduce the flow rate to a preset first flow rate.

[0059] When a refrigeration request for the refrigerated room is received, refrigeration needs to be provided for the refrigerated room, so the electric switching valve needs to be adjusted to communicate with the refrigerated evaporator so that the gaseous refrigerant can refrigerate the refrigerated room. In particular, if the liquid level in the refrigerated evaporator is higher than the preset liquid level upper limit, the compressor can be operated at a higher first frequency, the refrigerated fan can be controlled to operate, and the expansion valve can be adjusted to a lower flow rate to a preset first flow rate. In this way, the refrigerant supply to the refrigerated room can be achieved, and the liquid level in the refrigerated evaporator can be prevented from being too high.

[0060] Additionally, in one embodiment, based on the above step S302, according to the liquid level, the compressor, the first throttling component and the electric switching valve are controlled to provide the supply of liquid refrigerant and gaseous refrigerant, which may specifically include:

[0061] When a cooling request for the cold storage room is received and it is determined that the liquid level is equal to or lower than the preset upper limit of the liquid level and higher than the preset lower limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to maintain the current flow rate; the second frequency is lower than the first frequency.

[0062] When a refrigeration request for the refrigerated room is received, the electric switching valve is adjusted to communicate with the refrigerated evaporator so that the gaseous refrigerant can refrigerate the refrigerated room. In particular, if the liquid level in the refrigerated evaporator is lower than or equal to the preset upper limit of the liquid level and higher than the preset lower limit of the liquid level, the compressor can be operated at a second frequency lower than the first frequency, the refrigerated fan can be controlled to operate, and the expansion valve can be kept at the current flow rate. In this way, the refrigerant supply to the refrigerated room can be achieved, and the liquid level in the refrigerated evaporator can be prevented from being too high or too low.

[0063] In addition, in one embodiment, based on the above step S302, the compressor, the first throttling component and the electric switching valve are controlled according to the liquid level to provide the supply of liquid refrigerant and gaseous refrigerant, which may specifically include:

[0064] When a cooling request for the cold storage room is received and it is determined that the liquid level is equal to or lower than the preset lower limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to increase the flow rate to a preset second flow rate; the second flow rate is higher than the first flow rate.

[0065] That is, when a request for refrigeration of the refrigerated room is received, the electric switching valve is adjusted to communicate with the refrigerated evaporator so that the gaseous refrigerant can refrigerate the refrigerated room. In particular, if the liquid level in the refrigerated evaporator is lower than or equal to the preset lower limit of the liquid level, the compressor can be operated at a second frequency lower than the first frequency, the refrigerated fan can be controlled to operate, and the expansion valve can be increased to a preset second flow rate. In this way, the refrigerant supply to the refrigerated room can be achieved, and the liquid level in the refrigerated evaporator can be prevented from being too low.

[0066] Additionally, in one embodiment, based on the above step S302, according to the liquid level, the compressor, the first throttling component and the electric switching valve are controlled to provide the supply of liquid refrigerant and gaseous refrigerant, which may specifically include:

[0067] When a refrigeration request for the freezer compartment is received and it is determined that the liquid level is higher than the preset lower limit value, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to maintain the current flow rate.

[0068] When a request for refrigeration of the freezer compartment is received, the electric switching valve needs to be adjusted to communicate with the refrigeration evaporator so that the liquid refrigerant can refrigerate the freezer compartment. In particular, if the liquid level in the refrigeration evaporator is higher than the preset lower limit of the liquid level, the compressor can be operated at a second frequency lower than the first frequency, the refrigeration fan can be controlled to stop running, the freezing fan can be controlled to operate, and the expansion valve can be controlled to maintain the flow rate. In this way, the refrigerant supply to the freezer compartment can be achieved, and the liquid level in the refrigeration evaporator can be prevented from being too high or too low.

[0069] In addition, in one embodiment, based on the above step S302, according to the liquid level, the compressor, the first throttling component and the electric switching valve are controlled to provide the supply of liquid refrigerant and gaseous refrigerant, which may also include:

[0070] When a cooling request for the freezer compartment is received and it is determined that the liquid level is lower than or equal to the preset lower limit value of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to increase the flow rate to a preset second flow rate; the second flow rate is higher than the first flow rate.

[0071] When a request for refrigeration of the freezer compartment is received, the electric switching valve is adjusted to communicate with the refrigeration evaporator so that the liquid refrigerant can refrigerate the freezer compartment. In particular, if the liquid level in the refrigeration evaporator is lower than or equal to the preset lower limit of the liquid level, the compressor can be operated at a second frequency lower than the first frequency, the refrigeration fan can be controlled to stop running, the freezing fan can be controlled to run, and the expansion valve can be increased to a second flow rate. In this way, the refrigerant supply to the freezer compartment can be achieved, and the liquid level in the refrigeration evaporator can be prevented from being too low.

[0072] In addition, in some embodiments, when there is no refrigeration request for both the refrigerator and the freezer, the compressor can be controlled to stop running, the refrigeration fan can be controlled not to run, the electric switching valve can be controlled to switch to connect with the refrigeration evaporator, and the first throttling component can be closed.

[0073] In particular, in some embodiments, the upper limit of the liquid level can be 30 millimeters (mm), and the lower limit of the liquid level can be (refrigeration evaporator height - 20 mm); the first frequency of the compressor operation can be a value between 3500 revolutions per minute (prm) and 4500prm, for example, 4500prm, and the second frequency of the compressor operation can be a value greater than or equal to 1000prm and less than 3500prm, for example, 2000prm; the values ​​of the first flow rate and the second flow rate can be in the range of 0.5 liters per minute to 6 liters per minute, for example, the first flow rate can be 0.5 liters per minute, and the second flow rate can be 6 liters per minute. It can be understood that the values ​​of the upper limit of the liquid level, the lower limit of the liquid level, the first frequency, the second frequency, the first flow rate and the second flow rate can also be adjusted according to the needs of the actual application scenario.

[0074] Figure 4 is a flow chart of a refrigerator refrigeration control method in some embodiments, such as Figure 4 As shown, the refrigerator refrigeration control method includes the following steps:

[0075] Step S401, the refrigerator refrigeration system is powered on.

[0076] Step S402, the mainboard of the controller of the refrigerator refrigeration system is powered on.

[0077] In step S403, the controller determines whether the refrigerating chamber needs to be refrigerated; if so, execute step S404; otherwise, execute step S409.

[0078] In step S404, the controller determines whether the liquid level of the refrigeration evaporator is higher than the upper limit of the liquid level; if so, execute step S405; otherwise, execute step S406.

[0079] Step S405, the controller controls the compressor to operate at the first frequency, controls the refrigeration fan to operate, controls the electric switching valve to be connected to the refrigeration evaporator, and controls the expansion valve to reduce the flow rate to the first flow rate; and returns to execute step S403.

[0080] Step S406, the controller determines whether the liquid level of the refrigeration evaporator is higher than the lower limit of the liquid level; if so, execute step S407; otherwise, execute step S408.

[0081] Step S407, the controller controls the compressor to operate at the second frequency, controls the refrigeration fan to operate, controls the electric switching valve to be connected to the refrigeration evaporator, and controls the expansion valve to maintain the current flow rate; and returns to execute step S403.

[0082] Step S408, the controller controls the compressor to operate at the second frequency, controls the refrigeration fan to operate, controls the electric switching valve to be connected to the refrigeration evaporator, and controls the expansion valve to increase the flow rate to the second flow rate; and returns to execute step S403.

[0083] In step S409, the controller determines whether the freezer compartment needs to be refrigerated; if so, execute step S410; otherwise, execute step S413.

[0084] In step S410, the controller determines whether the liquid level of the refrigeration evaporator is higher than the lower limit of the liquid level; if so, execute step S411; otherwise, execute step S412.

[0085] Step S411, the controller controls the compressor to operate at the second frequency, controls the refrigeration fan not to operate, and the freezing fan to operate, controls the electric switching valve to be connected to the freezing evaporator, and controls the expansion valve to reduce the flow rate to maintain the current flow rate; returns to execute step S403.

[0086] In step S412, the controller controls the compressor to operate at the second frequency, controls the refrigeration fan not to operate, and the freezing fan to operate, controls the electric switching valve to be connected to the freezing evaporator, and controls the expansion valve to reduce the flow rate and increase the flow rate to the second flow rate; returns to execute step S410.

[0087] Step S413, control the compressor to stop running, control the refrigeration fan not to run, control the electric switching valve to switch to connect with the refrigeration evaporator, and close the expansion valve; return to execute step S403.

[0088] It should be understood that the specific embodiments described herein are only used to explain the application, rather than to limit it. Based on the embodiments provided in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of this application.

[0089] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0090] Obviously, the drawings are only some examples or embodiments of the present application. For ordinary technicians in the field, the present application can also be applied to other similar situations based on these drawings without creative work. In addition, it is understandable that although the work done in this development process may be complicated and lengthy, for ordinary technicians in the field, certain changes in design, manufacturing or production based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient content disclosed in this application.

[0091] The term "embodiment" in this application refers to a specific feature, structure or characteristic described in conjunction with the embodiment that can be included in at least one embodiment of the present application. The appearance of this phrase in various locations in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. It is clearly or implicitly understood by those of ordinary skill in the art that the embodiments described in this application can be combined with other embodiments without conflict.

[0092] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of patent protection. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the scope of protection of the present application. Therefore, the scope of protection of the present application shall be subject to the attached claims.

Claims

1. A refrigerator refrigeration system, characterized in that: include: Refrigeration evaporator, freezing evaporator, compressor, first throttling component, second throttling component, liquid level sensing device, electric switching valve and controller; wherein: The outlet of the first throttling component is connected to the inlet of the refrigerating evaporator; the lower liquid outlet of the refrigerating evaporator is connected to the second throttling component; the upper gas outlet of the refrigerating evaporator is connected to the electric switching valve; the outlet of the second throttling component is connected to the inlet of the freezing evaporator; the outlet of the freezing evaporator is connected to the electric switching valve; the electric switching valve is also connected to the compressor; The controller is electrically connected to the electric switching valve and the liquid level sensing device respectively; The liquid level sensing device is arranged in the refrigeration evaporator, and is used to detect the liquid level of the liquid refrigerant after gas-liquid separation in the refrigeration evaporator, and transmit the detected liquid level to the controller; The controller is used to control the compressor, the first throttling component and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant.

2. The refrigerator refrigeration system according to claim 1, characterized in that: The system further comprises a condenser; an inlet of the condenser is connected to the compressor; and an outlet of the condenser is connected to an inlet of the first throttling component.

3. The refrigerator refrigeration system according to claim 1, characterized in that: The first throttling component is an expansion valve.

4. The refrigerator refrigeration system according to any one of claims 1 to 3, characterized in that: The second throttling component is a throttling capillary.

5. A refrigerator refrigeration control method, characterized in that: A refrigerator refrigeration system for use in any one of claims 1 to 4; the method comprising: receiving the liquid level of the refrigerant in the refrigeration evaporator detected by the liquid level sensing device; According to the liquid level, the compressor, the first throttling component, and the electric switching valve are controlled to provide the supply of the liquid refrigerant and the gaseous refrigerant.

6. The refrigerator refrigeration control method according to claim 5, characterized in that: The step of controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant comprises: When a cooling request for the cold storage room is received and it is determined that the liquid level is higher than a preset upper limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset first frequency, and the first throttling component is controlled to reduce the flow rate to a preset first flow rate.

7. The refrigerator refrigeration control method according to claim 6, characterized in that: The step of controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant comprises: When a cooling request for the cold storage room is received and it is determined that the liquid level is equal to or lower than the preset upper limit of the liquid level and higher than the preset lower limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to maintain the current flow rate; the second frequency is lower than the first frequency.

8. The refrigerator refrigeration control method according to claim 6, characterized in that: The step of controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant comprises: When a cooling request for the cold storage room is received and it is determined that the liquid level is equal to or lower than the preset lower limit of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to increase the flow rate to a preset second flow rate; the second flow rate is higher than the first flow rate.

9. The refrigerator refrigeration control method according to claim 6, characterized in that: The step of controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant comprises: When a cooling request for the freezer compartment is received and it is determined that the liquid level is higher than the preset lower limit value of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to maintain the current flow rate.

10. The refrigerator refrigeration control method according to claim 6, characterized in that: The controlling the compressor, the first throttling component and the electric switching valve according to the liquid level to provide the supply of the liquid refrigerant and the gaseous refrigerant comprises: When a cooling request for the freezer compartment is received and it is determined that the liquid level is lower than or equal to the preset lower limit value of the liquid level, the electric switching valve is controlled to switch to connect with the refrigeration evaporator, the compressor is controlled to operate at a preset second frequency, and the first throttling component is controlled to increase the flow rate to a preset second flow rate; the second flow rate is higher than the first flow rate.

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