Method for Determining Operating Parameters of Single-System Inverter Refrigerator and its Refrigeration System

Abstract

This invention proposes a method for determining the operating parameters of a single-system variable frequency refrigerator and its refrigeration system. In this method, after the refrigerator enters a stable operating state, the compressor's operating rate is first determined to be an energy-saving rate. If so, the return gas temperature is determined to be close to the current ambient temperature. If so, the current compressor speed and the current flow control valve opening are determined and set as the target compressor speed and target flow control valve opening corresponding to the current ambient temperature. This invention innovatively introduces the compressor operating rate and return gas temperature as two key parameters, enabling the calculation of the most energy-efficient compressor speed and flow control valve opening under various ambient temperatures. This ensures that the refrigerator operates at the most energy-efficient compressor speed and flow control valve opening regardless of the ambient temperature, thus maintaining its most energy-efficient operating state.

Description

Technical Field

[0001] This invention relates to the field of refrigeration systems, and in particular to a single-system inverter refrigerator and a method for determining the operating parameters of its refrigeration system. Background Technology

[0002] A typical single-system refrigerator's refrigeration system consists of a compressor, condenser, capillary tube, and evaporator. The capillary tube functions as a throttling and heat exchanger. The system's flow rate is primarily regulated by the compressor's speed; other refrigeration components do not have mechanical movement. A drawback is that the system's flow rate is not adjustable at a given compressor speed, making it impossible to automatically find the flow rate that consumes the least power, resulting in high power consumption. Summary of the Invention

[0003] One objective of the first aspect of this invention is to provide a method for determining the operating parameters of a single-system inverter refrigerator that is low in power consumption and energy-saving.

[0004] A further objective of the first aspect of the invention is to determine the energy-efficient compressor speed as quickly as possible.

[0005] A second aspect of the present invention is to provide a single-system variable frequency refrigerator.

[0006] According to one aspect of the present invention, a method for determining the operating parameters of the refrigeration system of a single-system inverter refrigerator is provided, characterized in that the refrigeration system of the single-system inverter refrigerator comprises a compressor, a condenser, a heat exchange tube, a flow regulating valve, and an evaporator connected in sequence, and the method includes:

[0007] After the refrigerator enters a stable operating state, the compressor's operating rate is acquired and determined to be an energy-saving operating rate.

[0008] If so, obtain and determine whether the return air temperature of the refrigerator is close to the current ambient temperature;

[0009] If so, obtain the current compressor speed and current flow control valve opening of the refrigerator and determine them as the target compressor speed and target flow control valve opening corresponding to the current ambient temperature.

[0010] Optionally, the step of obtaining and determining whether the compressor's operating rate is an energy-saving operating rate includes:

[0011] Obtain and determine whether the compressor's operating rate is greater than or equal to a first preset operating rate and less than a second preset operating rate;

[0012] If so, then the compressor's operating rate is determined to be an energy-saving operating rate.

[0013] Optionally, after obtaining and determining whether the compressor's operating rate is greater than or equal to a first preset operating rate and less than a second preset operating rate, the method further includes:

[0014] If the compressor operating rate of the refrigerator is less than the first preset operating rate, the compressor is controlled to operate at a preset speed value, and after the first preset number of cooling cycles, the operating rate of the compressor is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0015] Optionally, after obtaining and determining whether the compressor's operating rate is greater than or equal to a first preset operating rate and less than a second preset operating rate, the method further includes:

[0016] If the compressor operating rate of the refrigerator is equal to the second preset operating rate, then the compressor is controlled to increase the preset speed value and after the first preset cooling cycle, the operating rate of the compressor is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0017] Optionally, the first preset boot rate is 80%-90%, and the second preset boot rate is 100%.

[0018] Optionally, the step of obtaining and determining whether the return gas temperature of the refrigerator is close to the current ambient temperature includes:

[0019] The refrigerator's return air temperature is obtained and determined to be greater than or equal to a first preset temperature and less than or equal to a second preset temperature, wherein the first preset temperature and the second preset temperature are determined based on the current ambient temperature.

[0020] If so, then the return air temperature is determined to be close to the current ambient temperature.

[0021] Optionally, after obtaining and determining whether the return gas temperature of the refrigerator is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the method further includes:

[0022] If the return air temperature of the refrigerator is lower than the first preset temperature, the flow regulating valve is adjusted to a smaller preset opening value and then, after a second preset cooling cycle, the compressor's operating rate is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0023] Optionally, after obtaining and determining whether the return gas temperature of the refrigerator is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the method further includes:

[0024] If the return air temperature of the refrigerator is greater than the second preset temperature, the flow regulating valve is adjusted to a larger preset opening value and then, after a second preset number of cooling cycles, the compressor's operating rate is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0025] Optionally, the flow regulating valve is an electronic expansion valve.

[0026] According to another aspect of the present invention, a single-system inverter refrigerator is also provided, comprising:

[0027] The refrigeration system consists of a compressor, condenser, heat exchange tubes, flow control valve and evaporator connected in sequence;

[0028] The controller includes a memory and a processor. The memory stores a computer program, which, when executed by the processor, is used to implement the method for determining the operating parameters of the refrigeration system of a single-system inverter refrigerator as described above.

[0029] This invention proposes a method for determining the operating parameters of a single-system variable frequency refrigerator and its refrigeration system. In this method, after the refrigerator enters a stable operating state, the compressor's operating rate is first determined to be an energy-saving rate. If so, the return gas temperature is determined to be close to the current ambient temperature. If so, the current compressor speed and the current flow control valve opening are determined and set as the target compressor speed and target flow control valve opening corresponding to the current ambient temperature. This invention innovatively introduces the compressor operating rate and return gas temperature as two key parameters, enabling the calculation of the most energy-efficient compressor speed and flow control valve opening under various ambient temperatures. This ensures that the refrigerator operates at the most energy-efficient compressor speed and flow control valve opening regardless of the ambient temperature, thus maintaining its most energy-efficient operating state.

[0030] Furthermore, if the refrigerator compressor's operating rate is less than the first preset operating rate, the compressor is controlled to operate at a preset speed value, and after the first preset cooling cycle, the operating rate of the compressor is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate; if the refrigerator compressor's operating rate is equal to the second preset operating rate, the compressor is controlled to operate at a preset speed value, and after the first preset cooling cycle, the operating rate of the compressor is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate, thereby quickly determining the energy-saving compressor speed.

[0031] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below.

[0032] 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

[0033] 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:

[0034] Figure 1 This is a structural block diagram of a single-system inverter refrigerator according to an embodiment of the present invention;

[0035] Figure 2 This is a structural block diagram of a controller according to an embodiment of the present invention;

[0036] Figure 3 This is a flowchart illustrating a method for determining the operating parameters of a single-system inverter refrigerator according to an embodiment of the present invention.

[0037] Figure 4 This is a complete flowchart illustrating a method for determining the operating parameters of a single-system inverter refrigerator according to an embodiment of the present invention. Detailed Implementation

[0038] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0039] It should be noted that, without conflict, the technical features of the embodiments and optional embodiments of the present invention can be combined with each other.

[0040] Figure 1 This is a structural block diagram of a single-system inverter refrigerator according to an embodiment of the present invention; Figure 2 This is a structural block diagram of a controller according to an embodiment of the present invention. See also... Figure 1 , 2As shown, the single-system inverter refrigerator 10 proposed in this invention includes a controller and a refrigeration system 100 that provides cooling capacity to the refrigerator compartment and the freezer compartment. The refrigeration system 100 consists of a compressor 110, a condenser 120, a heat exchange tube 130, a flow regulating valve 140, and an evaporator 150 connected in sequence. The flow regulating valve 140 is preferably an electronic expansion valve, fixed behind the refrigerator's air duct and connected to the finned evaporator. The heat exchange tube 130 is attached to the return gas pipe between the compressor 110 and the evaporator 150, exchanging heat with the return gas pipe. The controller 200 includes a memory 220 and a processor 210. The memory 220 stores a computer program 221, which, when executed by the processor 210, is used to implement the method for determining the operating parameters of the refrigeration system of the single-system inverter refrigerator in any of the following embodiments.

[0041] This invention replaces the capillary tube with a flow regulating valve 140 and a heat exchange tube 130. The heat exchange tube 130 is responsible for heat exchange with the return gas pipe between the compressor 110 and the evaporator 150. The heat exchange efficiency of the heat exchange tube 130 exceeds that of the capillary tube, allowing for more thorough preheating of the return gas pipe, reducing cold energy waste, improving the actual compressor COP, and reducing the refrigerator's power consumption. The flow regulating valve 140 is responsible for throttling. The flow regulating valve 140 can actively adjust the refrigerant flow in the refrigerator to match the appropriate compressor speed, changing the refrigerator's passive flow regulation method and reducing the refrigerator's power consumption.

[0042] Figure 3 This is a flowchart illustrating a method for determining the operating parameters of a single-system inverter refrigerator according to an embodiment of the present invention. See also... Figure 3 As shown, the method executed by the controller 200 may include at least the following steps S302-S306.

[0043] Step S302: After the refrigerator enters a stable operating state, obtain and determine whether the compressor 110's operating rate is an energy-saving operating rate;

[0044] Step S304: If yes, obtain and determine whether the return gas temperature of the refrigerator is close to the current ambient temperature;

[0045] Among them, the return gas temperature is the return gas temperature of the return gas pipe between the evaporator and the compressor.

[0046] Step S306: If yes, obtain the current compressor speed 110 and the current flow control valve opening of the refrigerator and determine them as the target compressor speed 110 and the target flow control valve opening corresponding to the current ambient temperature.

[0047] In this embodiment of the invention, after the refrigerator enters a stable operating state, the operating rate of the refrigerator's compressor 110 is first acquired and determined to be an energy-saving operating rate. If so, the return gas temperature of the refrigerator is acquired and determined to be close to the current ambient temperature. If so, the current compressor 110 speed and the current flow control valve opening are acquired and determined as the target compressor 110 speed and target flow control valve opening corresponding to the current ambient temperature. The proposed solution innovatively introduces the two key parameters of compressor 110 operating rate and return gas temperature, enabling the calculation of the most energy-efficient compressor speed and flow control valve opening under various ambient temperatures. This ensures that the refrigerator operates at the corresponding most energy-efficient compressor speed and flow control valve opening regardless of the ambient temperature, thus maintaining its most energy-efficient operating state.

[0048] In some embodiments of the present invention, the step S302 mentioned above, which involves obtaining and determining whether the operating rate of the compressor 110 is an energy-saving operating rate, includes: obtaining and determining whether the operating rate of the compressor 110 is greater than or equal to a first preset operating rate and less than a second preset operating rate; if so, then determining that the operating rate of the compressor 110 is an energy-saving operating rate.

[0049] Preferably, the first preset operating rate is 80%-90%, and the second preset operating rate is 100%. In reality, the lower the compressor speed (110), the lower the average power consumption; the higher the compressor operating rate (110), the smaller the temperature difference inside the refrigerator, the less heat loss from the evaporator and the refrigerator itself, and the lower the power consumption. Therefore, when adjusting the compressor speed (110), the principle is that the higher the operating rate, the better. The operating rate is preferably greater than or equal to 90% and less than 100%. Experiments have shown that within this range, the refrigerator operates in a more energy-efficient state.

[0050] In some embodiments of the present invention, after obtaining and determining whether the operating rate of the compressor 110 is greater than or equal to the first preset operating rate and less than the second preset operating rate, the method further includes: if the operating rate of the refrigerator compressor 110 is less than the first preset operating rate, then controlling the compressor 110 to operate at a preset speed value, and after a first preset number of cooling cycles, obtaining and determining whether the operating rate of the compressor 110 is greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0051] If the operating rate of compressor 110 is less than the first preset operating rate, it indicates that the compressor 110 speed is too high. In this case, the compressor 110 speed is reduced to a preset value, which can be determined according to actual needs, such as 50. Then, after the first preset number of cooling cycles following the reduction of the preset speed, the operating rate of compressor 110 is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0052] In some embodiments of the present invention, after obtaining and determining whether the operating rate of the compressor 110 is greater than or equal to the first preset operating rate and less than the second preset operating rate, the method further includes: if the operating rate of the refrigerator compressor 110 is equal to the second preset operating rate, then controlling the compressor 110 to increase the preset speed value and obtaining and determining whether the operating rate of the compressor 110 is greater than or equal to the first preset operating rate and less than the second preset operating rate after a first preset number of cooling cycles.

[0053] If the operating rate of compressor 110 is equal to the second preset operating rate, it means that the compressor 110 has a high speed. At this time, the compressor 110 will be controlled to increase the preset speed value. After the first preset cooling cycle after increasing the preset speed value, the operating rate of compressor 110 will be obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0054] It should be noted that the compressor 110 operating rate obtained after the first preset cooling cycle mentioned above can be the average operating rate of the compressor 110 in the first preset cooling cycle.

[0055] Furthermore, in some embodiments of the present invention, the step S304 mentioned above, which involves obtaining and determining whether the return air temperature of the refrigerator is close to the current ambient temperature, includes: obtaining and determining whether the return air temperature of the refrigerator is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, wherein the first preset temperature and the second preset temperature are determined based on the current ambient temperature; if so, it is determined that the return air temperature is close to the current ambient temperature.

[0056] The first preset temperature can be the current ambient temperature minus a first set temperature value, and the second preset temperature can be the current ambient temperature plus a second set temperature value. The first and second set temperature values ​​are very small, and they can be the same or different. For example, the first set temperature can be 2, and the second set temperature can be 1. Additionally, the current ambient temperature is actually the current temperature of the environment in which the refrigerator is located.

[0057] In fact, if the return gas temperature is greater than or equal to the first preset temperature or less than or equal to the second preset temperature (i.e., close to the current ambient temperature), it indicates that the refrigerant flow is at its optimal level and the refrigerator consumes the least amount of electricity. If the return gas temperature is lower than the first preset temperature, it indicates that the refrigerant flow is too large, the evaporator outlet temperature is low, and the cooling capacity is wasted. If the return gas temperature is higher than the second preset temperature, it indicates that the refrigerant flow is insufficient, which causes the refrigerant to overheat at the evaporator outlet, resulting in wasted work by the compressor 110.

[0058] In some embodiments of the present invention, after obtaining and determining whether the return air temperature of the refrigerator is greater than or equal to the first preset temperature or less than or equal to the second preset temperature, the method further includes: if the return air temperature of the refrigerator is less than the first preset temperature, then the flow regulating valve 140 is adjusted to a smaller preset opening value and after a second preset number of cooling cycles, the compressor 110's operating rate is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0059] If the return gas temperature is lower than the first preset temperature, it indicates that the refrigerant flow rate is too high. In this case, the preset opening value of the flow regulating valve 140 is reduced to decrease the refrigerant flow rate. The preset opening value is set according to the actual situation and can be 20. After adjusting the opening of the flow regulating valve 140, it may affect the operating rate of the compressor 110. Therefore, after the second preset refrigeration cycle following the adjustment of the opening value, the operating rate of the compressor 110 is re-acquired and judged to see if it is greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0060] In some embodiments of the present invention, after obtaining and determining whether the return air temperature of the refrigerator is greater than or equal to the first preset temperature or less than or equal to the second preset temperature, the method further includes: if the return air temperature of the refrigerator is greater than the second preset temperature, then the flow regulating valve 140 is adjusted to a preset opening value and, after a second preset number of cooling cycles, whether the operating rate of the compressor 110 is greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0061] If the return gas temperature is greater than the second preset temperature, it indicates that the refrigerant flow is too small. At this time, the preset opening value of the flow regulating valve 140 is increased to increase the refrigerant flow. Similarly, after the flow regulating valve 140 is adjusted, it may affect the operating rate of the compressor 110. Therefore, after the second preset cooling cycle after adjusting the opening value, the operating rate of the compressor 110 is re-acquired and judged to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

[0062] It should be noted that the compressor 110 operating rate obtained after the second preset cooling cycle mentioned above can be the average operating rate of the compressor 110 in the second preset cooling cycle.

[0063] Figure 4 This is a complete flowchart illustrating a method for determining the operating parameters of a single-system inverter refrigerator according to an embodiment of the present invention. To make this solution clearer, the following refers to... Figure 4 This plan will be explained in a clearer and more complete manner. See [link / reference]. Figure 4 As shown, the method may include at least the following steps S402-S422.

[0064] Step S402: After the refrigerator is running stably, obtain the start-up rate of the refrigerator's compressor 110;

[0065] Step S404: Determine whether the operating rate of compressor 110 is greater than or equal to the first preset operating rate and less than the second preset operating rate; if yes, proceed to step S406; if no, proceed to step S408.

[0066] Step S406: Obtain the return gas temperature of the refrigerator, and then proceed to step S410;

[0067] Step S408: Determine whether the operating rate of compressor 110 is less than the first preset operating rate; if yes, proceed to step S412; if no, proceed to step S414.

[0068] Step S410: Determine whether the return gas temperature is greater than or equal to the first preset temperature and less than or equal to the second preset temperature; if yes, proceed to step S416; if no, proceed to step S418.

[0069] Step S412: Control the compressor 110 to operate at a preset speed value, and after the first preset cooling cycle, return to step S404;

[0070] Step S414: Control the compressor 110 to increase the preset speed value, and after the first preset cooling cycle, return to step S404;

[0071] Step S416: Obtain the current compressor speed 110 and the current flow control valve opening of the refrigerator and determine them as the target compressor speed 110 and the target flow control valve opening corresponding to the current ambient temperature;

[0072] Step S418: Determine whether the return gas temperature is lower than the first preset temperature; if yes, proceed to step S420; if no, proceed to step S422.

[0073] Step S420: Adjust the flow regulating valve 140 to a smaller preset opening value and return to step S404 after the second preset cooling cycle.

[0074] Step S422: Adjust the flow regulating valve 140 to a larger preset opening value and run it. After the second preset cooling cycle, return to step S404.

[0075] In the method proposed in this invention, after the refrigerator enters a stable operating state, the first step is to obtain and determine whether the operating rate of the refrigerator's compressor 110 is an energy-saving operating rate. If so, the next step is to obtain and determine whether the refrigerator's return gas temperature is close to the current ambient temperature. If so, the next step is to obtain the current compressor 110 speed and the current flow control valve opening and determine them as the target compressor 110 speed and target flow control valve opening corresponding to the current ambient temperature. This invention innovatively introduces the two key parameters of compressor 110 operating rate and return gas temperature, enabling the calculation of the most energy-efficient compressor speed and flow control valve opening under various ambient temperatures. This ensures that the refrigerator operates in the most energy-efficient state regardless of the ambient temperature.

[0076] Furthermore, the functional units in the various embodiments of the present invention can be physically independent of each other, or two or more functional units can be integrated together, or all functional units can be integrated into one processing unit. The integrated functional units described above can be implemented in hardware, or in software or firmware.

[0077] Those skilled in the art will understand that integrated functional units, if implemented in software and sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or all or part of it, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computing device (e.g., a personal computer, server, or network device) to execute all or part of the steps of the methods of the various embodiments of this invention when running the instructions. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0078] Alternatively, all or part of the steps of the foregoing method embodiments can be implemented by hardware (such as a computing device, personal computer, server, or network device) related to program instructions. The program instructions can be stored in a computer-readable storage medium. When the program instructions are executed by the processor of the computing device, the computing device executes all or part of the steps of the methods described in the various embodiments of the present invention.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that within the spirit and principles of the present invention, modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the corresponding technical solutions to depart from the protection scope of the present invention.

Claims

1. A method for determining the operating parameters of a single-system inverter refrigerator's refrigeration system, characterized in that, The refrigeration system of the single-system inverter refrigerator consists of a compressor, a condenser, a heat exchange tube, a flow regulating valve, and an evaporator connected in sequence. The method includes: After the refrigerator enters a stable operating state, the compressor's operating rate is acquired and determined to be an energy-saving operating rate. If so, obtain and determine whether the return air temperature of the refrigerator is close to the current ambient temperature; If so, obtain the current compressor speed and current flow control valve opening of the refrigerator and determine them as the target compressor speed and target flow control valve opening corresponding to the current ambient temperature.

2. The method according to claim 1, characterized in that, The steps for obtaining and determining whether the compressor's operating rate is an energy-saving operating rate include: Obtain and determine whether the compressor's operating rate is greater than or equal to a first preset operating rate and less than a second preset operating rate; If so, then the compressor's operating rate is determined to be an energy-saving operating rate.

3. The method according to claim 2, characterized in that, After obtaining and determining whether the compressor's operating rate is greater than or equal to a first preset operating rate and less than a second preset operating rate, the method further includes: If the compressor operating rate of the refrigerator is less than the first preset operating rate, the compressor is controlled to operate at a preset speed value, and after the first preset number of cooling cycles, the operating rate of the compressor is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

4. The method according to claim 2, characterized in that, After obtaining and determining whether the compressor's operating rate is greater than or equal to a first preset operating rate and less than a second preset operating rate, the method further includes: If the compressor operating rate of the refrigerator is equal to the second preset operating rate, then the compressor is controlled to increase the preset speed value and after the first preset cooling cycle, the operating rate of the compressor is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

5. The method according to claim 2, characterized in that, The first preset boot rate is 80%-90%, and the second preset boot rate is 100%.

6. The method according to claim 2, characterized in that, The steps for obtaining and determining whether the return gas temperature of the refrigerator is close to the current ambient temperature include: The refrigerator's return air temperature is obtained and determined to be greater than or equal to a first preset temperature and less than or equal to a second preset temperature, wherein the first preset temperature and the second preset temperature are determined based on the current ambient temperature. If so, then the return air temperature is determined to be close to the current ambient temperature.

7. The method according to claim 6, characterized in that, After obtaining and determining whether the return gas temperature of the refrigerator is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the method further includes: If the return air temperature of the refrigerator is lower than the first preset temperature, the flow regulating valve is adjusted to a smaller preset opening value and then, after a second preset cooling cycle, the compressor's operating rate is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

8. The method according to claim 6, characterized in that, After obtaining and determining whether the return gas temperature of the refrigerator is greater than or equal to a first preset temperature and less than or equal to a second preset temperature, the method further includes: If the return air temperature of the refrigerator is greater than the second preset temperature, the flow regulating valve is adjusted to a larger preset opening value and then, after a second preset number of cooling cycles, the compressor's operating rate is obtained and determined to be greater than or equal to the first preset operating rate and less than the second preset operating rate.

9. The method according to claim 1, characterized in that, The flow regulating valve is an electronic expansion valve.

10. A single-system inverter refrigerator, characterized in that, include: The refrigeration system consists of a compressor, condenser, heat exchange tubes, flow control valve and evaporator connected in sequence; The controller includes a memory and a processor, wherein the memory stores a computer program, which, when executed by the processor, is used to implement the method for determining the operating parameters of the refrigeration system of a single-system inverter refrigerator according to any one of claims 1 to 9.

Images