Refrigeration system and refrigeration control method

Abstract

This application relates to a refrigerator refrigeration system and a refrigerator refrigeration control method. In this refrigeration system, the outlet of a first throttling component is connected to the inlet of a refrigeration evaporator; the lower liquid outlet of the refrigeration evaporator is connected to a second throttling component; the upper gaseous outlet of the refrigeration evaporator is connected to an electric switching valve; the outlet of the second throttling component is connected to the inlet of a freezing evaporator; the outlet of the freezing evaporator is connected to an electric switching valve; the electric switching valve is also connected to a compressor; a controller is electrically connected to the electric switching valve and a liquid level sensor, respectively; the liquid level sensor is installed inside the refrigeration evaporator, and 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 liquid and gaseous refrigerant. Through secondary throttling and gas-liquid separation, the average suction pressure of the refrigerator refrigeration system is increased, thereby increasing the system's cooling capacity and effectively improving refrigeration efficiency, and increasing the COP.

Description

Technical Field

[0001] This application relates to the field of refrigerators, and in particular to refrigerator refrigeration systems and refrigerator refrigeration control methods. Background Technology

[0002] In existing refrigerator systems, common system modes include single-system mode, series-parallel system mode, and parallel mode. In single-system mode and series-parallel system mode, the compressor's suction pressure matches the evaporation pressure of the freezer compartment, resulting in a lower suction pressure. In parallel mode, when cooling the refrigerator compartment, the compressor's suction pressure matches the evaporation pressure of the refrigerator compartment; when cooling the freezer compartment, the compressor's suction pressure matches the evaporation pressure of the freezer compartment, and the average evaporation pressure remains low.

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

[0004] There is currently no effective solution to the problem of low overall cooling performance coefficient of refrigerator refrigeration systems in related technologies. Summary of the Invention

[0005] This embodiment provides a refrigerator refrigeration system and a refrigerator refrigeration control method to solve the problem of low overall refrigeration performance coefficient of refrigerator refrigeration systems in related technologies.

[0006] In a first aspect, this embodiment provides a refrigerator refrigeration system, 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 refrigerated evaporator; the lower liquid outlet of the refrigerated evaporator is connected to the second throttling component; the upper gaseous outlet of the refrigerated evaporator is connected to the electric switching valve; the outlet of the second throttling component is connected to the inlet of the refrigerated evaporator; the outlet of the refrigerated 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 installed inside the refrigeration evaporator. The liquid level sensing device 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, so as to provide the supply of liquid refrigerant and gaseous refrigerant.

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

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

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

[0014] Secondly, this embodiment provides a refrigerator cooling control method for the refrigerator cooling system described in the first aspect above; the method includes:

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

[0016] 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.

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

[0018] Upon receiving a refrigeration request from the refrigerator compartment and determining that the liquid level is higher than the preset upper limit value, the system controls the electric switching valve to connect with the refrigerator evaporator, controls the compressor to operate at a preset first frequency, and controls the first throttling component to reduce the flow rate to a preset first flow rate.

[0019] In some embodiments, controlling the compressor, the first throttling component, and the electrically operated switching valve based on the liquid level to provide a supply of the liquid refrigerant and the gaseous refrigerant includes:

[0020] Upon receiving a refrigeration request from the refrigerator compartment, and determining 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 communication with the refrigerator 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, controlling the compressor, the first throttling component, and the electrically operated switching valve based on the liquid level to provide a supply of the liquid refrigerant and the gaseous refrigerant includes:

[0022] Upon receiving a refrigeration request from the refrigerator compartment and determining that the liquid level is equal to or lower than the preset lower limit value, the electric switching valve is controlled to switch to communication with the refrigerator 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, controlling the compressor, the first throttling component, and the electrically operated switching valve based on the liquid level to provide a supply of the liquid refrigerant and the gaseous refrigerant includes:

[0024] Upon receiving a cooling request from the freezer compartment and determining that the liquid level is higher than the preset lower limit, the system controls the electric switching valve to connect with the evaporator, controls the compressor to operate at a preset second frequency, and controls the first throttling component to maintain the current flow rate.

[0025] In some embodiments, controlling the compressor, the first throttling component, and the electrically operated switching valve based on the liquid level to provide a supply of the liquid refrigerant and the gaseous refrigerant includes:

[0026] Upon receiving a cooling request from the freezer compartment and determining that the liquid level is lower than or equal to the preset lower limit value, the electric switching valve is controlled to switch to communication with the freezer 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 related technologies, this embodiment provides a refrigerator refrigeration system and a refrigerator refrigeration control method. The refrigerator refrigeration system, through secondary throttling and gas-liquid separation, increases the average suction pressure of the refrigerator refrigeration system, thereby increasing the system's cooling capacity and effectively improving refrigeration efficiency, and raising the COP.

[0028] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0029] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

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

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

[0032] Figure 3 This is a flowchart of the refrigerator cooling control method in this embodiment;

[0033] Figure 4 This is a flowchart of a refrigerator cooling control method according to some embodiments. Detailed Implementation

[0034] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0035] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning as understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these,” used in this application, do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to such processes, methods, products, or devices. The terms “connected,” “linked,” and “coupled,” used in this application, are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. The term “multiple” used in this application refers to two or more. The "and / or" operator describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: A alone, A and B simultaneously, and B alone. Typically, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," and "third," etc., used in this application are merely for distinguishing similar objects and do not represent a specific ordering of the objects.

[0036] The method embodiments provided in this example can be executed on a terminal, computer, or similar computing device. For example, it can run on a terminal. Figure 1 This is a hardware structure block diagram of the terminal of the refrigerator cooling control method in this embodiment. For example... Figure 1 As shown, a terminal may include one or more ( Figure 1Only one is shown in the diagram. A processor 102 and a memory 104 for storing data are also included. The processor 102 may be, but is not limited to, a microprocessor (MCU) or a programmable logic device (FPGA). The terminal may also include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that… Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the terminal described above. For example, the terminal may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown are illustrated.

[0037] The memory 104 can be used to store computer programs, such as application software programs and modules, like 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, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0038] The transmission device 106 is used to receive or send data via a network. This network includes a wireless network provided by the terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 can be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0039] This embodiment provides a refrigerator refrigeration system. Figure 2 This is a schematic diagram of the refrigerator refrigeration system 20 in this embodiment, as shown below. 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 sensor (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 gaseous 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 refrigerated evaporator 22; the outlet of the refrigerated 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 sensor respectively; the liquid level sensor is installed inside the refrigerated evaporator 21, and the liquid level sensor 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, in this embodiment, the refrigerator refrigeration system 20 is configured with a two-stage throttling system. The refrigerant, after being throttled by the first throttling component 24, enters the refrigerator evaporator 21, where it cools the refrigerator compartment. Simultaneously, the refrigerant undergoes gas-liquid separation within the refrigerator evaporator 21, with the lower part containing low-temperature liquid refrigerant and the upper part containing low-temperature gaseous refrigerant. The gaseous refrigerant returns to the compressor 23 through the upper gaseous outlet of the refrigerator evaporator 21, while the liquid refrigerant flows out from the lower liquid outlet of the refrigerator evaporator 21. After undergoing secondary throttling by the second throttling component 25, its temperature and pressure are further reduced, cooling the freezer compartment, and then it returns to the compressor 23.

[0042] By throttling the refrigerant, pressure reduction is achieved. The refrigerant evaporated in the refrigeration evaporator 21 has been converted into a gaseous state, so it can directly enter the compressor 23 for compression to enter the next refrigeration cycle without secondary throttling. The liquid refrigerant, after secondary throttling by the second throttling component 25, has its temperature and pressure further reduced to cool the freezer compartment, and then enters the compressor 23 to enter the next refrigeration cycle.

[0043] In related technologies, 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 compressor's suction pressure matches the evaporation pressure of the freezer compartment, resulting in a lower suction pressure. In parallel mode, when cooling the refrigerator compartment, the compressor's suction pressure matches the evaporation pressure of the refrigerator compartment; when cooling the freezer compartment, the compressor's suction pressure matches the evaporation pressure of the freezer compartment, and the average evaporation pressure remains low.

[0044] In this embodiment, during refrigerator cooling, the higher the evaporator temperature, the greater the evaporation pressure. Therefore, the refrigeration evaporator has a high temperature and thus a high evaporation pressure; the freezing evaporator has a low temperature and thus a low evaporation pressure. Consequently, in related technologies, without gas-liquid separation, the suction pressure matches the freezing evaporation pressure, resulting in a lower suction pressure. After gas-liquid separation, the suction pressure of the refrigerant evaporating in the refrigeration unit matches the refrigeration evaporation pressure, thereby increasing the suction pressure and thus improving the average suction pressure of the refrigerator's cooling system.

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

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

[0047] Furthermore, this embodiment includes a liquid level sensor within the refrigeration evaporator 21 to monitor the liquid refrigerant level, ensuring refrigerant supply within the refrigeration evaporator 21 and guaranteeing the continuity of the overall system operation. For example, when the liquid level in the refrigeration evaporator is high, the electric valve switches to the freezer compartment channel, consuming liquid refrigerant and lowering the liquid level; when the liquid level is low, the electric valve switches to the refrigerator compartment channel, the compressor draws away gaseous refrigerant from the refrigerator compartment, and the liquid level rises. Additionally, based on the monitored liquid levels and the cooling needs of the two different compartments (refrigeration and freezer), the flow rate 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] Specifically, the controller described above can be implemented based on a microcontroller unit (MCU). The liquid level sensing device described above 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 specific limitations in this regard.

[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] In another embodiment, the second throttling component is a throttling capillary.

[0052] This embodiment also provides a refrigerator cooling control method for the refrigerator cooling system provided in the above embodiments, such as... Figure 3 This is a flowchart of the refrigerator cooling control method in this embodiment, as follows: Figure 3 As shown, the refrigerator cooling control method includes the following steps:

[0053] Step S301: Receive the refrigerant level in the refrigeration evaporator detected by the liquid level sensor;

[0054] Step S302: Based on the liquid level, control the compressor, the first throttling component, and the electric switching valve to provide a supply of liquid refrigerant and gaseous refrigerant.

[0055] Specifically, the controller connects and communicates with the liquid level sensor. Based on the liquid level sent by the liquid level sensor, the controller controls the compressor, the first throttling component, and the electric switching valve, thereby ensuring the supply of liquid and gaseous refrigerant throughout the refrigerator refrigeration system and achieving the continuity of the refrigerator refrigeration system operation.

[0056] Steps S301 to S302 described above can increase the average suction pressure of the refrigerator refrigeration system through secondary throttling and gas-liquid separation, thereby increasing the system's cooling capacity and effectively improving refrigeration efficiency and COP.

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

[0058] Upon receiving a refrigeration request from the refrigerator compartment and determining that the liquid level is higher than the preset upper limit, the system controls the electric switching valve to connect with the refrigerator evaporator, controls the compressor to run at a preset first frequency, and controls the first throttling component to reduce the flow rate to a preset first flow rate.

[0059] When a cooling request is received from the refrigerator compartment, cooling needs to be provided. Therefore, the electric switching valve needs to be adjusted to connect with the refrigerator evaporator so that gaseous refrigerant can cool the refrigerator compartment. Specifically, if the liquid level in the refrigerator evaporator is higher than a preset upper limit, the compressor can be set to operate at a higher first frequency, the refrigerator fan can be controlled, and the expansion valve can be adjusted to reduce the flow rate to a preset first flow rate. This ensures refrigerant supply to the refrigerator compartment and prevents the liquid level in the refrigerator evaporator from becoming too high.

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

[0061] Upon receiving a cooling request from the refrigerator compartment and determining that the liquid level is equal to or lower than the preset upper limit and higher than the preset lower limit, the system controls the electric switching valve to connect with the refrigerator evaporator, controls the compressor to operate at a preset second frequency, and controls the first throttling component to maintain the current flow rate; the second frequency is lower than the first frequency.

[0062] When a cooling request is received from the refrigerator compartment, the electric switching valve is connected to the refrigerator evaporator to allow gaseous refrigerant to cool the refrigerator compartment. Specifically, if the liquid level in the refrigerator evaporator is lower than or equal to a preset upper limit but higher than a preset lower limit, the compressor can be set to operate at a second frequency lower than the first frequency, the refrigerator fan can be controlled to run, and the expansion valve can maintain its current flow rate. This ensures refrigerant supply to the refrigerator compartment and prevents the liquid level in the refrigerator evaporator from becoming too high or too low.

[0063] Furthermore, 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 a supply of liquid refrigerant and gaseous refrigerant, which may specifically include:

[0064] Upon receiving a refrigeration request from the refrigerator compartment and determining that the liquid level is equal to or lower than the preset lower limit, the electric switching valve is controlled to switch to communication with the refrigerator 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] In other words, when a cooling request is received from the refrigerator compartment, the electric switching valve is connected to the refrigerator evaporator to allow gaseous refrigerant to cool the refrigerator compartment. Specifically, if the liquid level in the refrigerator evaporator is lower than or equal to a preset lower limit, the compressor can be set to operate at a second frequency lower than the first frequency, the refrigerator fan can be controlled to run, and the expansion valve can be set to increase the flow rate to a preset second flow rate. This ensures refrigerant supply to the refrigerator compartment and prevents the liquid level in the refrigerator evaporator from becoming too low.

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

[0067] Upon receiving a cooling request from the freezer compartment and determining that the liquid level is higher than the preset lower limit, the electric switching valve is switched to connect with the 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 cooling request is received from the freezer compartment, the electric switching valve needs to be adjusted to connect with the refrigeration evaporator, allowing liquid refrigerant to cool the freezer compartment. Specifically, if the liquid level in the refrigeration evaporator is higher than a preset lower limit, the compressor can be set to operate at a second frequency lower than the first frequency, the refrigeration fan can be stopped, the refrigeration fan can be controlled to operate, and the expansion valve can maintain its flow rate. This ensures refrigerant supply to the freezer compartment and prevents the liquid level in the refrigeration evaporator from becoming too high or too low.

[0069] Furthermore, in one embodiment, based on the above step S302, controlling the compressor, the first throttling component, and the electric switching valve according to the liquid level to provide a supply of liquid refrigerant and gaseous refrigerant may further include:

[0070] Upon receiving a cooling request from the freezer compartment and determining that the liquid level is lower than or equal to a preset lower limit, the electric switching valve is controlled to switch to communication with the 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 cooling request is received from the freezer compartment, the electric switching valve is connected to the refrigeration evaporator to allow liquid refrigerant to cool the freezer compartment. Specifically, if the liquid level in the refrigeration evaporator is lower than or equal to a preset lower limit, the compressor can be set to operate at a second frequency lower than the first frequency, the refrigeration fan can be stopped, the refrigeration fan can be set to operate, and the expansion valve can be set to increase the flow rate to a second flow rate. This ensures refrigerant supply to the freezer compartment and prevents the liquid level in the refrigeration evaporator from becoming too low.

[0072] In addition, in some embodiments, when there is no cooling request in either the refrigerator compartment or the freezer compartment, the compressor can be stopped, the refrigerator fan can be stopped, the electric switching valve can be switched to connect with the refrigerator evaporator, and the first throttling component can be closed.

[0073] Specifically, 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 (refrigerator evaporator height - 20 mm); the first operating frequency of the compressor can be a value between 3500 revolutions per minute (rpm) and 4500 rpm, for example, 4500 rpm; the second operating frequency of the compressor can be a value greater than or equal to 1000 rpm and less than 3500 rpm, for example, 2000 rpm; 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. Understandably, 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 be adjusted according to the needs of the actual application scenario.

[0074] Figure 4 These are flowcharts of some embodiments of refrigerator cooling control methods, such as... Figure 4 As shown, the refrigerator cooling control method includes the following steps:

[0075] Step S401: Power on the refrigerator's refrigeration system.

[0076] In step S402, the main board of the refrigerator refrigeration system controller is powered on.

[0077] In step S403, the controller determines whether the refrigerator compartment needs cooling; if so, proceed to step S404; otherwise, proceed to 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, proceed to step S405; otherwise, proceed to step S406.

[0079] In step S405, the controller controls the compressor to run at the first frequency, controls the refrigeration fan to run, controls the electric switching valve to connect with the refrigeration evaporator, and controls the expansion valve to reduce the flow rate to the first flow rate; then return to 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 yes, proceed to step S407; otherwise, proceed to step S408.

[0081] In step S407, the controller controls the compressor to run at the second frequency, controls the refrigeration fan to operate, controls the electric switching valve to connect with the refrigeration evaporator, and controls the expansion valve to maintain the current flow rate; then return to step S403.

[0082] In step S408, the controller controls the compressor to run at the second frequency, controls the refrigeration fan to run, controls the electric switching valve to connect with the refrigeration evaporator, and controls the expansion valve to increase the flow rate to the second flow rate; then return to step S403.

[0083] In step S409, the controller determines whether the freezer compartment needs cooling; if so, proceed to step S410; otherwise, proceed to 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, proceed to step S411; otherwise, proceed to step S412.

[0085] Step S411: The controller controls the compressor to run at the second frequency, controls the refrigeration fan to not run, the refrigeration fan to run, controls the electric switching valve to connect with the refrigeration evaporator, and controls the expansion valve to reduce the flow rate to maintain the current flow rate; return to step S403.

[0086] In step S412, the controller controls the compressor to run at the second frequency, controls the refrigeration fan to not run, the refrigeration fan to run, controls the electric switching valve to connect with the evaporator, and controls the expansion valve to reduce the flow rate and increase the flow rate to the second flow rate; then return to step S410.

[0087] Step S413: Control the compressor to stop running, control the refrigeration fan to stop running, control the electric switching valve to switch to connect with the refrigeration evaporator, and close the expansion valve; return to step S403.

[0088] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection 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, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0090] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0091] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or independent of other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0092] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A refrigerator refrigeration system, characterized in that, include: The components include a refrigerated evaporator, a frozen evaporator, a compressor, a first throttling component, a second throttling component, a liquid level sensor, an electric switching valve, and a controller; among which: The outlet of the first throttling component is connected to the inlet of the refrigerated evaporator; the lower liquid outlet of the refrigerated evaporator is connected to the second throttling component; the upper gaseous outlet of the refrigerated evaporator is connected to the electric switching valve; the outlet of the second throttling component is connected to the inlet of the refrigerated evaporator; the outlet of the refrigerated 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 installed inside the refrigeration evaporator. The liquid level sensing device 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, so as to provide the supply of liquid refrigerant and gaseous refrigerant.

2. The refrigerator refrigeration system according to claim 1, characterized in that, The system also includes a condenser; the inlet of the condenser is connected to the compressor; and the outlet of the condenser is connected to the 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 cooling control method, characterized in that, The method is used in a refrigerator refrigeration system according to any one of claims 1 to 4; the method includes: Receive the refrigerant level in the refrigeration evaporator detected by the liquid level sensing device; The compressor, the first throttling component, and the electric switching valve are controlled according to the liquid level to provide the supply of liquid and 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 electrically operated switching valve according to the liquid level to provide the supply of liquid and gaseous refrigerant includes: Upon receiving a refrigeration request from the refrigerator compartment and determining that the liquid level is higher than the preset upper limit value, the system controls the electric switching valve to connect with the refrigerator evaporator, controls the compressor to operate at a preset first frequency, and controls the first throttling component 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 electrically operated switching valve according to the liquid level to provide the supply of liquid and gaseous refrigerant includes: Upon receiving a refrigeration request from the refrigerator compartment, and determining 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 communication with the refrigerator 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 electrically operated switching valve according to the liquid level to provide the supply of liquid and gaseous refrigerant includes: Upon receiving a refrigeration request from the refrigerator compartment and determining that the liquid level is equal to or lower than the preset lower limit value, the electric switching valve is controlled to switch to communication with the refrigerator 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 electrically operated switching valve according to the liquid level to provide the supply of liquid and gaseous refrigerant includes: Upon receiving a cooling request from the freezer compartment and determining that the liquid level is higher than the preset lower limit, the system controls the electric switching valve to connect with the evaporator, controls the compressor to operate at a preset second frequency, and controls the first throttling component to maintain the current flow rate.

10. The refrigerator refrigeration control method according to claim 6, characterized in that, The step of controlling the compressor, the first throttling component, and the electrically operated switching valve according to the liquid level to provide a supply of liquid refrigerant and gaseous refrigerant includes: Upon receiving a cooling request from the freezer compartment and determining that the liquid level is lower than or equal to the preset lower limit value, the electric switching valve is controlled to switch to communication with the freezer 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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