Refrigerant quantity adjustable refrigerator and control method and system thereof

Abstract

The invention is suitable for the technical field of refrigerators, and provides a refrigerant quantity adjustable refrigerator which comprises a compressor, a condenser, a three-way switching valve, an evaporator and a refrigerant adjuster. The three-way switching valve is provided with a first switching valve, a second switching valve and a third switching valve, the first switching valve is used for communicating the condenser with the evaporator, the second switching valve is used for communicating the refrigerant regulator with the evaporator, and the third switching valve is used for communicating the condenser with the refrigerant regulator; the compressor is connected with the condenser and the evaporator, the refrigerant circulation amount of the refrigerator refrigerating system is determined through the evaporator, and the refrigerant adjuster is used for adjusting storage and release of refrigerants in the refrigerating process of the refrigerator. And the energy-saving requirement under the low-temperature or low-load working condition can be met, so that the operation energy efficiency and reliability of the refrigerator are comprehensively improved.

Description

Technical Field

[0001] This application belongs to the field of refrigerator technology, and in particular relates to a refrigerator with adjustable refrigerant quantity and its control method and system. Background Technology

[0002] In existing technology, the amount of refrigerant circulating in a refrigerator's refrigeration system is fixed. This amount of refrigerant circulation is determined through a forced continuous operation experiment at 32°C. It involves a compromise between high-temperature and low-temperature circulation amounts, which can basically meet performance requirements.

[0003] However, in existing refrigerator refrigeration systems, at low ambient temperatures (below 25℃) or low loads, the required cooling capacity and refrigerant circulation volume are small. Excessive refrigerant would cause the compressor to operate at higher power and consume more energy, thus requiring less refrigerant circulation. At high ambient temperatures (above 25℃) or high loads, the required cooling capacity and refrigerant circulation volume are large. This necessitates a larger cooling capacity to increase the compressor's speed, power, and cooling capacity. Insufficient refrigerant would cause the compressor to run continuously and fail to reach the set temperature, thus requiring a larger refrigerant circulation volume.

[0004] Therefore, the refrigerant circulation volume matched in the existing refrigerator refrigeration system cannot meet the requirements of the refrigerant circulation volume during the refrigerator temperature control process, thus failing to achieve the energy-saving effect. Summary of the Invention

[0005] This application provides a refrigerator with adjustable refrigerant quantity and its control method and system, which can solve one of the above-mentioned problems in the prior art.

[0006] In a first aspect, embodiments of this application provide a refrigerator with adjustable refrigerant capacity, including a compressor, a condenser, a three-way switching valve, an evaporator, and a refrigerant regulator; The three-way switching valve is provided with a first switching valve, a second switching valve and a third switching valve. The first switching valve is used to connect the condenser and the evaporator, the second switching valve is used to connect the refrigerant regulator and the evaporator, and the third switching valve is used to connect the condenser and the refrigerant regulator. The compressor is connected to the condenser and the evaporator. The evaporator determines the refrigerant circulation volume of the refrigerator's refrigeration system. The refrigerant regulator is used to regulate the storage and release of refrigerant during the refrigerator's refrigeration process.

[0007] Furthermore, the evaporator is equipped with a liquid reservoir and a flow sensor; The flow sensor is installed in the return gas pipe of the evaporator; The flow sensor monitors the liquid flow rate of the refrigerant before it flows into the evaporator, and the real-time refrigerant circulation volume of the refrigerator refrigeration system is determined by the liquid flow rate of the refrigerant.

[0008] Furthermore, the refrigerant-adjustable refrigerator also includes a dryer filter and a capillary tube; The drying filter and the capillary tube are sequentially arranged in the connection passage between the condenser and the three-way switching valve.

[0009] Secondly, embodiments of this application provide a control method for a refrigerator with adjustable refrigerant quantity, including: The volumetric flow rate of the refrigerant in its pure liquid state and the liquid flow rate flowing into the evaporator are obtained to determine the real-time refrigerant circulation volume of the refrigerator refrigeration system. Based on the preset refrigerant quantity threshold and combined with the real-time refrigerant circulation quantity, the supply and demand matching of refrigerant circulation quantity in the refrigerator refrigeration system is determined. Based on the supply and demand matching situation, the first switching valve, the second switching valve, and the third switching valve in the three-way switching valve are switched so that the refrigerant regulator can regulate the storage and release of refrigerant during the refrigerator's cooling process.

[0010] Furthermore, determining the supply and demand matching of refrigerant circulation in the refrigerator refrigeration system based on a preset refrigerant quantity threshold and the real-time refrigerant circulation quantity includes: Establish a refrigerant quantity threshold mapping table between refrigerant quantity and operating conditions. Combined with the real-time operating conditions of the refrigerator, obtain the maximum refrigerant quantity threshold and the minimum refrigerant quantity threshold from the refrigerant quantity threshold mapping table. If the real-time refrigerant circulation volume is between the minimum refrigerant volume threshold and the maximum refrigerant volume threshold, then the refrigerant circulation volume is determined to be in a supply-demand match. If the real-time refrigerant circulation volume is less than the minimum refrigerant volume threshold, then the refrigerant circulation volume is determined to be insufficient. If the real-time refrigerant circulation volume is greater than the maximum refrigerant volume threshold, then the refrigerant circulation volume is determined to be excessive.

[0011] Furthermore, establishing the mapping table between refrigerant quantity thresholds and operating conditions includes: Multiple test environment temperature points and multiple test load levels can be set to combine into various test conditions; For each test condition, the refrigerator refrigeration system was run with different refrigerant circulation rates, and the system performance parameters under each refrigerant circulation rate were collected and recorded. The system performance parameters for each test condition are analyzed to determine the minimum and maximum refrigerant thresholds for each test condition. The test environment temperature points, test load levels, and corresponding minimum and maximum refrigerant quantity thresholds under all test conditions are associated and stored to form the refrigerant quantity threshold mapping table.

[0012] Furthermore, the analysis of system performance parameters for each test condition to determine the minimum and maximum refrigerant quantity thresholds for each test condition includes: Plot the energy consumption curve of the system as a function of the refrigerant circulation volume under the corresponding test conditions, and select the point with the lowest energy consumption from the energy consumption curve. Based on the lowest energy consumption point and combined with a preset percentage, select the second energy consumption point from the energy consumption change curve, and set the refrigerant circulation amount corresponding to the second energy consumption point as the maximum refrigerant amount threshold. Plot the cooling time variation curve as the refrigerant circulation volume changes under the corresponding test conditions, select the inflection point of the cooling time from the cooling time variation curve, and determine the first circulation volume. Plot the discharge temperature change curve of the compressor discharge temperature as a function of the refrigerant circulation amount under the corresponding test conditions. Select the inflection point of the discharge temperature from the discharge temperature change curve, or the refrigerant circulation amount corresponding to the time when the preset safe temperature limit is reached, and set it as the second circulation amount. The larger value between the first circulation quantity and the second circulation quantity is taken, and combined with the preset safety margin, to obtain the minimum refrigerant quantity threshold.

[0013] Furthermore, the step of switching the first, second, and third switching valves in the three-way switching valve according to the supply and demand matching situation, so that the refrigerant regulator regulates the storage and release of refrigerant during the refrigerator's cooling process, includes: When the refrigerant circulation volume matches the demand, the three-way switching valve is switched to the first switching valve, so that the refrigerant flows to the evaporator for cooling; When the refrigerant circulation is insufficient, the three-way switching valve is switched to the second switching valve, causing the refrigerant regulator to release refrigerant. When the refrigerant circulation is excessive, the three-way switching valve is switched to the third switching valve, so that the refrigerant regulator stores refrigerant.

[0014] Furthermore, the storage and release of the refrigerant includes: Obtain the ambient temperature to determine the basic refrigerant circulation volume of the refrigerator's refrigeration system; Based on the ambient temperature and the basic refrigerant circulation volume, and in conjunction with the refrigerator's target temperature, the refrigerant quantity difference of the refrigerator's refrigeration system is determined. Based on the refrigerant quantity difference, combined with the maximum or minimum refrigerant quantity threshold, the amount of refrigerant stored or released by the refrigerant regulator is determined.

[0015] Thirdly, embodiments of this application provide a control system for a refrigerator with adjustable refrigerant quantity, including: First processing module: used to obtain the volumetric flow rate of refrigerant in pure liquid state and the liquid flow rate flowing into the evaporator, and to determine the real-time refrigerant circulation volume of the refrigerator refrigeration system; The second processing module is used to determine the supply and demand matching of refrigerant circulation in the refrigerator refrigeration system based on a preset refrigerant quantity threshold and the real-time refrigerant circulation quantity. The third processing module is used to switch the first, second, and third switching valves in the three-way switching valve according to the supply and demand matching situation, so that the refrigerant regulator can regulate the storage and release of refrigerant during the refrigerator's cooling process.

[0016] Fourthly, embodiments of this application provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described control method for a refrigerator with adjustable refrigerant quantity.

[0017] Fifthly, embodiments of this application provide a computer-readable storage medium, including a computer program stored in the computer-readable storage medium, which, when executed by a processor, implements the control method for the refrigerant-adjustable refrigerator described above.

[0018] The beneficial effects of the embodiments of this application compared with the prior art are: This application discloses a refrigerator with adjustable refrigerant quantity. A three-way switching valve controls the flow of refrigerant in the refrigeration system between the condenser, refrigerant regulator, and evaporator. Through intelligent refrigerant regulation, this refrigerator can meet both high-temperature or high-load conditions for rapid cooling and low-temperature or low-load conditions for energy saving, thereby comprehensively improving the refrigerator's operational energy efficiency and reliability. Furthermore, based on the refrigerator's real-time operating conditions, the supply and demand matching of the refrigerant circulation in the refrigeration system is further determined. The storage and release of refrigerant are combined with the ambient temperature to determine the corresponding refrigerant quantity difference, which is ultimately adjusted by the refrigerant regulator. This achieves both daily energy saving and rapid cooling under high-temperature and high-load conditions. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a refrigerator with adjustable refrigerant quantity according to an embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of the evaporator in the embodiment shown; Figure 3 This is a schematic flowchart of a control method for a refrigerator with adjustable refrigerant quantity according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the control system of a refrigerator with adjustable refrigerant quantity according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a computer device provided in an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures: 1-Compressor, 2-Condenser, 3-Dryer filter, 4-Capillary tube, 5-Three-way switching valve, 6-Evaporator, 61-Receiver, 7-Refrigerant regulator. Detailed Implementation

[0022] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0023] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0024] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0025] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0026] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0028] Please see Figure 1 As shown, the present invention provides a refrigerator with adjustable refrigerant quantity, specifically including: a compressor 1, a condenser 2, a three-way switching valve 5, an evaporator 6, and a refrigerant regulator 7; the three-way switching valve 5 is provided with a first switching valve, a second switching valve, and a third switching valve, the first switching valve being used to connect the condenser 2 and the evaporator 6, the second switching valve being used to connect the refrigerant regulator 7 and the evaporator 6, and the third switching valve being used to connect the condenser 2 and the refrigerant regulator 7; the compressor 1 is connected to the condenser 2 and the evaporator 6, and the refrigerant circulation quantity of the refrigerator refrigeration system is determined through the evaporator 6; the refrigerant regulator 7 is used to regulate the storage and release of refrigerant during the refrigerator refrigeration process.

[0029] In this application, a refrigerant regulator 7 is installed in the refrigerator refrigeration system to regulate the storage and release of refrigerant during the refrigerator refrigeration process. Furthermore, a three-way switching valve 5 is used to control the flow relationship of refrigerant in the refrigerator refrigeration system between the condenser 2, the refrigerant regulator 7, and the evaporator 6. Through intelligent regulation of the refrigerant, the refrigerator with adjustable refrigerant quantity can meet both the cooling speed under high temperature or high load conditions and the energy-saving requirements under low temperature or low load conditions, thereby comprehensively improving the refrigerator's operating energy efficiency and reliability.

[0030] Specifically, such as Figure 1 As shown, the three-way switching valve 5 connects the condenser 2, the refrigerant regulator 7, and the evaporator 6. When the three-way switching valve 5 is switched to the first switching valve, the AC path is connected, allowing the refrigerant after being condensed and cooled by the condenser 2 to flow to the evaporator 6 to cool the refrigerator. The refrigerant then flows back into the compressor 1 for refrigeration cycle. When the three-way switching valve 5 is switched to the second switching valve, the BC path is connected. At this time, the AC and AB paths are closed, and the refrigerant in the refrigerant regulator 7 is released to replenish the refrigerant in the refrigerator's refrigeration system to meet the cooling requirements under high temperature or high load conditions. When the three-way switching valve 5 is switched to the third switching valve, the AB path is connected. At this time, the AC and BC paths are closed, and the refrigerant after being condensed and cooled by the condenser 2 flows to the refrigerant regulator 7 for storage. This allows excess refrigerant in the refrigerator's refrigeration system to be stored, improving the refrigerator's energy-saving effect. The stored refrigerant can also be used for refrigerant release when the BC path is connected, realizing refrigerant circulation in the refrigerant regulator 7.

[0031] In some of these embodiments, such as Figure 2 As shown, the evaporator 6 is equipped with a liquid receiver 61 and a flow sensor; the flow sensor is installed in the return pipe of the evaporator 6; the flow sensor monitors the liquid flow rate of the refrigerant before it flows into the evaporator 6, and the real-time refrigerant circulation volume of the refrigerator refrigeration system is determined by the liquid flow rate of the refrigerant.

[0032] In this embodiment, after the refrigerant absorbs heat and evaporates in the evaporator 6, it flows back to the compressor 1 and other components through the return pipe to continue participating in the refrigeration cycle. Therefore, a flow sensor is installed on the return pipe of the evaporator 6 to monitor the flow rate of the refrigerant flowing through the evaporator 6 in real time, thereby providing data support for subsequent analysis of the refrigerant circulation volume in the refrigerator refrigeration system.

[0033] In some embodiments, the above-mentioned refrigerant-adjustable refrigerator further includes a dryer filter 3 and a capillary tube 4; the dryer filter 3 and the capillary tube 4 are sequentially arranged in the connection passage between the condenser 2 and the three-way switching valve 5.

[0034] Specifically, during the installation or operation of the refrigerator's refrigeration system, impurities such as welding slag and metal fragments may remain in the pipes. These impurities can clog the capillary tube 4 or corrode the compressor 1 components. Therefore, a dryer filter 3 is installed to filter moisture and impurities from the refrigerant, ensuring refrigerant purity, preventing ice blockage and damage to the pipes by corrosive substances, and avoiding system malfunctions. Furthermore, the capillary tube 4 acts as a throttling device, regulating refrigerant pressure and controlling refrigerant flow through the resistance of the thin tube. When the refrigerator's evaporator 6 requires low-pressure refrigerant for heat exchange, the precise throttling of the capillary tube 4 maintains a low-temperature environment in the evaporator 6, ensuring refrigeration efficiency.

[0035] More specifically, the dryer filter 3 and capillary tube 4 are sequentially arranged in the connection passage between the condenser 2 and the three-way switching valve 5. The dryer filter 3 and capillary tube 4 are located in the common connection passage between the condenser 2 and the evaporator 6, and between the condenser 2 and the refrigerant regulator 7, specifically on the common connection passage a of the ac and ab paths. Specifically, when the three-way switching valve 5 connects the condenser 2 and the evaporator 6, the compressor 1 compresses the refrigerant and it enters the condenser 2 for condensation and cooling. Then, it passes through the dryer filter 3 to remove impurities and moisture, and is then throttled through the capillary tube 4. The refrigerant then enters the evaporator 6 through the ac path to cool the refrigerator, and then re-enters the compressor 1 to form a refrigeration cycle. When the three-way switching valve 5 connects the condenser 2 and the refrigerant regulator 7, the compressor 1 compresses the refrigerant and it enters the condenser 2 for condensation and cooling. Then, it passes through the dryer filter 3 to remove impurities and moisture, and is then throttled through the capillary tube 4. The refrigerant then enters the refrigerant regulator 7 through the ab path for refrigerant storage. The dryer filter 3 ensures the purity of the stored refrigerant.

[0036] Please see Figure 3 As shown, the present invention also provides a control method for a refrigerator with adjustable refrigerant quantity, comprising the following steps: S100: Obtain the volumetric flow rate of the refrigerant in pure liquid state and the liquid flow rate flowing into the evaporator 6, and determine the real-time refrigerant circulation volume of the refrigerator refrigeration system. Specifically, the refrigerant undergoes a gas-liquid transformation in the refrigerator's refrigeration system. Before flowing into the liquid receiver 61, the refrigerant is usually in a gas-liquid mixed state according to the refrigerator's refrigeration requirements. The flow rate Qi of the liquid portion of the refrigerant is monitored by a flow sensor. Furthermore, during the refrigerator's design process, the refrigerator's refrigeration system is tested to obtain the volumetric flow rate Qm of the refrigerant in its pure liquid state.

[0037] In this embodiment, a percentage value Qi / Qm is obtained by dividing the actual monitored liquid refrigerant flow rate Qi by the volumetric flow rate Qm in the pure liquid state. This percentage value reflects the ratio of the actual liquid refrigerant flow rate entering the receiver 61 to the flow rate in the pure liquid state. Since the refrigerant circulation volume is closely related to the liquid refrigerant flow rate, if the percentage value is close to 100%, it indicates that the refrigerant entering the receiver 61 is close to the pure liquid state, which means that the refrigerant circulation volume is relatively sufficient. If the percentage value is low, it indicates that there are more gaseous components in the refrigerant and the refrigerant circulation volume is insufficient. Therefore, Qi / Qm is used to measure the real-time refrigerant circulation volume of the refrigerator refrigeration system, thereby reflecting the refrigerant circulation status in the refrigerator refrigeration system.

[0038] S200. Based on the preset refrigerant quantity threshold and combined with the real-time refrigerant circulation quantity, determine the supply and demand matching of refrigerant circulation quantity in the refrigerator refrigeration system. In some embodiments, step S200 above includes: Establish a refrigerant quantity threshold mapping table between refrigerant quantity and operating conditions. Combined with the real-time operating conditions of the refrigerator, obtain the maximum refrigerant quantity threshold and the minimum refrigerant quantity threshold from the refrigerant quantity threshold mapping table. If the real-time refrigerant circulation volume is between the minimum refrigerant volume threshold and the maximum refrigerant volume threshold, then the refrigerant circulation volume is determined to be in a supply-demand match. If the real-time refrigerant circulation volume is less than the minimum refrigerant volume threshold, then the refrigerant circulation volume is determined to be insufficient. If the real-time refrigerant circulation volume is greater than the maximum refrigerant volume threshold, then the refrigerant circulation volume is determined to be excessive.

[0039] In this embodiment, the maximum and minimum refrigerant quantities under the current refrigerator operating conditions are obtained from the refrigerant quantity threshold mapping table. By comparing the real-time refrigerant circulation quantity obtained in step S100 with the maximum and minimum refrigerant quantities, the refrigerant supply and demand matching situation in the refrigerator refrigeration system is determined.

[0040] Specifically, during the refrigeration cycle of the refrigerator refrigeration system, the percentage of liquid refrigerant Qi / Qm before it flows into the receiver 61 is monitored in real time. If Qi / Qm > P1, it indicates that the amount of refrigerant circulating in the refrigerator refrigeration system is excessive and refrigerant circulation needs to be stored. If P2 ≤ Qi / Qm ≤ P1, it indicates that the amount of refrigerant circulating in the refrigerator refrigeration system is appropriate and refrigeration cycle can proceed. If Qi / Qm < P2, it indicates that the amount of refrigerant circulating in the refrigerator refrigeration system is insufficient and refrigerant circulation needs to be released. It can be understood that P1 represents the maximum refrigerant quantity threshold and P2 represents the minimum refrigerant quantity threshold.

[0041] More specifically, the refrigerator's operating conditions are measured by ambient temperature and load level. For ambient temperature, a temperature sensor is installed on the back or top of the refrigerator to detect the ambient temperature. For load level, in a preferred embodiment, it is determined using a formula... To measure, among which, This indicates the difference between the current ambient temperature and the preset ambient temperature. This indicates the operating time of compressor 1, used to reflect the continuous cooling capacity of the refrigerator's control system. The start-stop frequency is indicated by the number of times the compressor starts and stops, which is used to correct short-term load fluctuations, such as frequent opening and closing of the door causing frequent start-stop of compressor 1. a, b, and c represent weighting coefficients.

[0042] In some embodiments, establishing the mapping table between refrigerant quantity thresholds and refrigerant quantity thresholds under operating conditions includes: Multiple test environment temperature points and multiple test load levels can be set to combine into various test conditions; For each test condition, the refrigerator refrigeration system was run with different refrigerant circulation rates, and the system performance parameters under each refrigerant circulation rate were collected and recorded. The system performance parameters for each test condition are analyzed to determine the minimum and maximum refrigerant thresholds for each test condition. The test environment temperature points, test load levels, and corresponding minimum and maximum refrigerant quantity thresholds under all test conditions are associated and stored to form the refrigerant quantity threshold mapping table.

[0043] In this embodiment, a refrigerant quantity threshold mapping table is set up between the refrigerant circulation quantity and the operating conditions. Specifically, the refrigerant quantity threshold mapping table defines the minimum and maximum refrigerant quantity thresholds corresponding to the operating conditions formed by different combinations of ambient temperature and different load levels. The minimum and maximum refrigerant quantity thresholds are obtained by conducting multiple rounds of testing on the refrigerator during the refrigerator design process.

[0044] Specifically, during the testing process, multiple test ambient temperature points and multiple test load levels are set. A test ambient temperature point and a test load level are combined into a test condition. For each test condition, the refrigerant circulation rate starts from an initial value and is gradually increased in preset steps. After each step increase, the refrigerator refrigeration system is run until a stable state is reached. At the same time, system performance parameters under each refrigerant circulation rate are collected and recorded, including cooling time, system energy consumption, and compressor discharge temperature. Furthermore, the system performance parameters recorded under each test condition are analyzed to determine the minimum and maximum refrigerant quantity thresholds for that test condition. Then, the test ambient temperature points, test load levels, and corresponding minimum and maximum refrigerant quantity thresholds for all test conditions are constructed into a refrigerant quantity threshold mapping table and stored in the refrigerator controller for data acquisition during refrigerant quantity analysis in the refrigerator refrigeration system.

[0045] In some embodiments, the analysis of system performance parameters for each test condition to determine the minimum and maximum refrigerant quantity thresholds for each test condition includes: Plot the energy consumption curve of the system as a function of the refrigerant circulation volume under the corresponding test conditions, and select the point with the lowest energy consumption from the energy consumption curve. Based on the lowest energy consumption point and combined with a preset percentage, select the second energy consumption point from the energy consumption change curve, and set the refrigerant circulation amount corresponding to the second energy consumption point as the maximum refrigerant amount threshold. Plot the cooling time variation curve as the refrigerant circulation volume changes under the corresponding test conditions, select the inflection point of the cooling time from the cooling time variation curve, and determine the first circulation volume. Plot the discharge temperature change curve of compressor 1 as a function of refrigerant circulation volume under the corresponding test conditions. Select the inflection point of the discharge temperature from the discharge temperature change curve, or the refrigerant circulation volume corresponding to the time when the preset safe temperature limit is reached, and set it as the second circulation volume. The larger value between the first circulation quantity and the second circulation quantity is taken, and combined with the preset safety margin, to obtain the minimum refrigerant quantity threshold.

[0046] In this embodiment, the system performance parameters include system energy consumption, cooling time, and compressor 1 exhaust temperature. The system energy consumption is used to determine the maximum refrigerant quantity threshold, and the cooling time and compressor 1 exhaust temperature are used to determine the minimum refrigerant quantity threshold.

[0047] Specifically, for each test condition, curves were plotted for each system performance parameter as a function of refrigerant circulation, namely, energy consumption change curve, cooling time change curve, and exhaust temperature curve.

[0048] More specifically, regarding the energy consumption change curve, when the refrigerant is insufficient, the evaporator 6 does not exchange heat sufficiently. At this time, the compressor 1 needs to operate at high load for a long time to maintain the temperature, resulting in increased energy consumption. When the refrigerant is appropriate, the heat exchange efficiency of the refrigerator refrigeration system reaches its optimal level, and the compressor 1 operates smoothly, resulting in the lowest energy consumption. However, when there is too much refrigerant, the heat exchange efficiency decreases, and the compressor 1 needs to increase its power to maintain pressure balance, resulting in increased energy consumption. Therefore, the energy consumption change curve is "U-shaped" or "V-shaped". The left side of the lowest energy consumption point is usually due to insufficient refrigerant, while the right side is usually due to excessive refrigerant. Thus, in the energy consumption change curve, the second energy consumption point to the right of the lowest energy consumption point is selected as the maximum refrigerant threshold for this test condition. Furthermore, this second energy consumption point is specifically the maximum acceptable energy efficiency degradation range of the refrigerator control system, usually measured as a percentage. For example, in one embodiment, the refrigerator control system allows a 5% energy efficiency loss. The energy consumption value of the second energy consumption point is calculated by multiplying the lowest energy consumption point by 1.05, and the corresponding refrigerant amount is determined from the energy consumption change curve and used as the maximum refrigerant threshold.

[0049] Regarding the cooling time and exhaust temperature variation curves, when the refrigerant is insufficient, the refrigerant in evaporator 6 does not evaporate completely, leading to a prolonged cooling time, and potentially preventing the set temperature from being reached. Furthermore, the suction pressure of compressor 1 decreases, and the exhaust temperature rises sharply. Therefore, in the cooling time variation curve, the refrigerant circulation rate is gradually increased, and the cooling time is recorded for each cycle to plot the cooling time variation curve. The cooling time decreases significantly with increasing refrigerant quantity, and an inflection point appears when the refrigerant quantity is sufficient, at which point the cooling time tends to stabilize. The refrigerant quantity corresponding to this inflection point is thus set as the first circulation rate. Similarly, in the exhaust temperature variation curve, the refrigerant circulation rate is gradually increased, and the exhaust temperature of compressor 1 corresponding to each refrigerant circulation rate is recorded to plot the exhaust temperature variation curve. The exhaust temperature decreases sharply with increasing refrigerant quantity, and an inflection point appears when the refrigerant quantity is sufficient, at which point the exhaust temperature... As the temperature stabilizes, the refrigerant quantity corresponding to this inflection point is set as the second circulation quantity. Furthermore, if the first circulation quantity > the second circulation quantity, it indicates that the deterioration point of the cooling time is later than the critical point of the exhaust temperature. In this case, the minimum refrigerant quantity threshold is determined according to the exhaust temperature requirement. Similarly, if the second circulation quantity > the first circulation quantity, it indicates that the critical point of the exhaust temperature is later than the deterioration point of the cooling time. In this case, the minimum refrigerant quantity threshold is determined according to the cooling time requirement. That is, the larger of the first and second circulation quantities is taken as the minimum refrigerant quantity threshold to ensure that the requirements of cooling time and exhaust temperature are met simultaneously. Furthermore, in order to compensate for errors caused by refrigerant charge measurement deviation, operating condition fluctuations, etc., and refrigerant leakage during long-term operation of the refrigerator, a safety margin is set in the minimum refrigerant quantity threshold. This safety margin is adjusted according to the size of the refrigerator and is usually set to 5g.

[0050] Specifically, through experimental calibration, a dynamic mapping relationship between the refrigerant quantity threshold and different operating conditions was established, enabling the refrigerator to judge the supply and demand status of refrigerant in real time. This solves the problem that the fixed refrigerant quantity setting in the existing technology cannot adapt to all operating conditions, avoids energy efficiency degradation at low ambient temperature / low load, and ensures cooling performance at high ambient temperature / high load, thereby comprehensively improving the refrigerator's operating energy efficiency and reliability.

[0051] S300. Based on the supply and demand matching situation, the first switching valve, the second switching valve, and the third switching valve in the three-way switching valve 5 are switched so that the refrigerant regulator 7 regulates the storage and release of refrigerant during the refrigerator's cooling process.

[0052] In some embodiments, step S300 above includes: When the refrigerant circulation volume matches the demand, the three-way switching valve 5 is switched to the first switching valve, so that the refrigerant flows to the evaporator 6 for cooling; When the refrigerant circulation is insufficient, the three-way switching valve 5 is switched to the second switching valve, so that the refrigerant regulator 7 releases refrigerant. When the refrigerant circulation is excessive, the three-way switching valve 5 is switched to the third switching valve, so that the refrigerant regulator 7 stores refrigerant.

[0053] Specifically, such as Figure 1 As shown, when the three-way switching valve 5 is switched to the first switching valve, the AC path is connected, allowing the refrigerant, after being condensed and cooled by the condenser 2, to flow to the evaporator 6 to cool the refrigerator. The refrigerant then flows back into the compressor 1 for the refrigeration cycle. When the three-way switching valve 5 is switched to the second switching valve, the BC path is connected. At this time, the AC and AB paths are closed, and the refrigerant in the refrigerant regulator 7 is released to replenish the refrigerant in the refrigerator's refrigeration system to meet the cooling requirements under high temperature or high load conditions. When the three-way switching valve 5 is switched to the third switching valve, the AB path is connected. At this time, the AC and BC paths are closed, and the refrigerant, after being condensed and cooled by the condenser 2, flows to the refrigerant regulator 7 for storage. This allows excess refrigerant in the refrigerator's refrigeration system to be stored, improving the refrigerator's energy-saving effect. The stored refrigerant can also be used for refrigerant release when the BC path is connected, realizing refrigerant circulation in the refrigerant regulator 7.

[0054] In some embodiments, the storage and release of the refrigerant includes: Obtain the ambient temperature to determine the basic refrigerant circulation volume of the refrigerator's refrigeration system; Based on the ambient temperature and the basic refrigerant circulation volume, and in conjunction with the refrigerator's target temperature, the refrigerant quantity difference of the refrigerator's refrigeration system is determined. Based on the refrigerant quantity difference, combined with the maximum refrigerant quantity threshold or the minimum refrigerant quantity threshold, the amount of refrigerant stored or released by the refrigerant regulator 7 is determined.

[0055] In this embodiment, different basic refrigerant circulation volumes are set for different ambient temperature ranges. Specifically, when the ambient temperature is ≤16℃, the basic refrigerant circulation volume is M. min g, when 16℃ < ambient temperature < 38℃, the basic refrigerant circulation volume is M. mid g, When the ambient temperature is ≥38℃, the basic refrigerant circulation volume is M. mid g.

[0056] Furthermore, the basic refrigerant circulation volume for each of the aforementioned ambient temperature ranges was determined experimentally during the refrigerator design phase. Specifically, a forced continuous operation test was conducted on the refrigerator at the highest ambient temperature required by the climate type, 38°C, to determine the basic refrigerant circulation volume M for an ambient temperature ≥38°C. mid g. Simultaneously, a forced continuous operation test was conducted on the refrigerator at an ambient temperature of 32℃ to determine the basic refrigerant circulation volume M of the refrigerator when the ambient temperature is between 16℃ and 38℃. midSimilarly, with an environmental temperature of 16℃, a forced continuous operation test was conducted on the refrigerator to determine the basic refrigerant circulation volume M when the ambient temperature is ≤16℃. min g, where the test conditions for the forced continuous operation experiment are that compressor 1 and fan are always on and continuously running at low temperature.

[0057] It is worth noting that the ambient temperature range in the above-mentioned process of determining the basic refrigerant circulation volume is a preferred embodiment of this application. In other embodiments, the ambient temperature range can be determined experimentally during the refrigerator design process according to actual production needs.

[0058] In this embodiment, the refrigerant charge difference ΔM is calculated based on the temperature difference between the refrigerator's target temperature and the ambient temperature, combined with the baseline cooling cycle volume at that ambient temperature. The specific calculation formula is: ΔM = M base ×k×ΔT / T ref , of which M base The base cooling cycle capacity is represented by k, the linear correction factor is represented by ΔT, and the temperature difference between the ambient temperature and the target temperature of the refrigerator is represented by T. ref This represents the reference temperature difference, i.e., the temperature difference under standard operating conditions. For example, if an ambient temperature of 25°C corresponds to a freezing target of -18°C, then T... ref =25−(−18)=43℃, which is understandable. ΔM indicates the basic amount of refrigerant that the current refrigerator control system needs to store / release.

[0059] Furthermore, combining the above step S200, the maximum and minimum refrigerant thresholds obtained from the refrigerant threshold mapping table are used to determine the refrigerant storage / release values ​​required by the current refrigerator control system. Specifically, Furthermore, based on the release or storage rate of the refrigerant regulator, the release and storage times are calculated. For example, when the three-way switching valve 5 is connected to path ab, it is for refrigerant storage. Every A seconds after connection, B grams of refrigerant will be stored. Therefore, the refrigerant storage time Tstore = ( / B)×A seconds, when the three-way switching valve 5 is connected to path bc, it releases refrigerant. Every C seconds after connection, D grams of refrigerant will be released. Therefore, the refrigerant release time Trelease = ( / D)×C seconds, specifically, when the refrigerant regulator releases a certain amount of refrigerant... When the time is right, the path is switched to the AC path via the three-way switching valve 5. At this time, the refrigerator refrigeration system uses... +M base The refrigerant circulation volume is used for refrigeration, and when the refrigerant regulator's storage capacity reaches... When the time is right, the path is switched to the AC path via the three-way switching valve 5. At this time, the refrigerator refrigeration system uses M... base - The refrigerant circulation volume is used for cyclic refrigeration.

[0060] In some embodiments, the dynamic control of refrigerant circulation in the refrigerator refrigeration system is carried out on a refrigeration cycle basis. That is, in each refrigeration cycle, the real-time operating conditions of the refrigerator are determined. If the supply and demand matching situation mapped by the real-time operating conditions remains unchanged, and the change in ambient temperature does not cross the level of the ambient temperature range, then the refrigerant circulation in the next refrigeration cycle remains unchanged from the refrigerant circulation in the previous refrigeration cycle.

[0061] Please see Figure 4 As shown, the present invention also provides a control system for a refrigerator with adjustable refrigerant quantity, the system comprising: First processing module 401: used to obtain the volumetric flow rate of refrigerant in pure liquid state and the liquid flow rate flowing into the evaporator 6, and to determine the real-time refrigerant circulation volume of the refrigerator refrigeration system; The second processing module 402 is used to determine the supply and demand matching of refrigerant circulation in the refrigerator refrigeration system based on a preset refrigerant quantity threshold and the real-time refrigerant circulation quantity. The third processing module 403 is used to switch the first switching valve, the second switching valve and the third switching valve in the three-way switching valve 5 according to the supply and demand matching situation, so that the refrigerant regulator 7 can regulate the storage and release of refrigerant during the refrigerator's cooling process.

[0062] It is understandable that, such as Figure 3 The content of the control method embodiment for the refrigerant-adjustable refrigerator shown is applicable to the control system embodiment for this refrigerant-adjustable refrigerator. The specific functions implemented by the control system embodiment for this refrigerant-adjustable refrigerator are as follows: Figure 3 The control method for the refrigerant-adjustable refrigerator shown is the same as that in the embodiment, and the beneficial effects achieved are the same as those described above. Figure 3 The beneficial effects achieved by the control method embodiment of the refrigerator with adjustable refrigerant volume shown are also the same.

[0063] It should be noted that the information interaction and execution process between the above systems are based on the same concept as the method embodiments of the present invention. For details on their specific functions and technical effects, please refer to the method embodiments section, which will not be repeated here.

[0064] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the system can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0065] Please see Figure 5 As shown, this embodiment of the invention also provides a computer device 5, including: a memory 502 and a processor 501, and a computer program 503 stored in the memory 502. When the computer program 503 is executed on the processor 501, it implements the control method of the refrigerant quantity adjustable refrigerator as described in any of the above methods.

[0066] The computer device 5 may be a desktop computer, laptop, handheld computer, or cloud server, etc. The computer device 5 may include, but is not limited to, a processor 501 and a memory 502. Those skilled in the art will understand that... Figure 5 The computer device 5 is merely an example and does not constitute a limitation on the computer device 5. It may include more or fewer components than shown in the figure, or combine certain components, or different components, such as input / output devices, network access devices, etc.

[0067] The processor 501 may be a Central Processing Unit (CPU), or it may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0068] In some embodiments, the memory 502 may be an internal storage unit of the computer device 5, such as a hard disk or memory of the computer device 5. In other embodiments, the memory 502 may be an external storage device of the computer device 5, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the computer device 5. Furthermore, the memory 502 may include both internal and external storage units of the computer device 5. The memory 502 is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory 502 can also be used to temporarily store data that has been output or will be output.

[0069] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the control method for a refrigerant-adjustable refrigerator as described in any of the above methods.

[0070] In this embodiment, if the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographic device / computer device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0071] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A refrigerator with adjustable refrigerant quantity, characterized in that, The compressor, the condenser, the three-way switch valve, the evaporator and the refrigerant regulator; The three-way switch valve is provided with a first switch valve, a second switch valve and a third switch valve, the first switch valve is used for connecting the condenser and the evaporator, the second switch valve is used for connecting the refrigerant regulator and the evaporator, and the third switch valve is used for connecting the condenser and the refrigerant regulator; The compressor is connected with the condenser and the evaporator, and the refrigerant circulation amount of the refrigerator refrigeration system is determined through the evaporator, and the refrigerant regulator is used for regulating the storage and release of the refrigerant in the refrigerator refrigeration process.

2. The refrigerator having an adjustable amount of refrigerant according to claim 1, wherein The evaporator is provided with a liquid accumulator and a flow sensor; The flow sensor is arranged on the gas return pipe of the evaporator; The liquid flow of the refrigerant before flowing into the evaporator is monitored through the flow sensor, and the real-time refrigerant circulation amount of the refrigerator refrigeration system is determined through the liquid flow of the refrigerant.

3. The refrigerator having an adjustable amount of refrigerant according to claim 1, wherein It also includes a drying filter and a capillary tube; The drying filter and the capillary tube are arranged in the connecting passage of the condenser and the three-way switch valve in sequence.

4. A control method of a refrigerant volume adjustable refrigerator for controlling the refrigerant volume adjustable refrigerator according to any one of claims 1 to 3, characterized by, Specifically, the following steps are included: The volume flow of the refrigerant in the pure liquid state and the liquid flow between the evaporator are obtained, and the real-time refrigerant circulation amount of the refrigerator refrigeration system is determined; Based on the preset refrigerant amount threshold value, the real-time refrigerant circulation amount is combined to determine the supply-demand matching condition of the refrigerant circulation amount in the refrigerator refrigeration system; According to the supply-demand matching condition, the first switch valve, the second switch valve and the third switch valve in the three-way switch valve are switched, so that the refrigerant regulator regulates the storage and release of the refrigerant in the refrigerator refrigeration process.

5. The method of claim 4, wherein, The determination of the supply-demand matching condition of the refrigerant circulation amount in the refrigerator refrigeration system based on the preset refrigerant amount threshold value and the real-time refrigerant circulation amount includes: A refrigerant amount threshold value mapping relationship table of refrigerant amount and working condition is established, and the maximum refrigerant amount threshold value and the minimum refrigerant amount threshold value are obtained from the refrigerant amount threshold value mapping relationship table combined with the real-time working condition of the refrigerator; If the real-time refrigerant circulation amount is between the minimum refrigerant amount threshold value and the maximum refrigerant amount threshold value, it is determined that the supply-demand matching of the refrigerant circulation amount is matched; If the real-time refrigerant circulation amount is less than the minimum refrigerant amount threshold value, it is determined that the refrigerant circulation amount is insufficient; If the real-time refrigerant circulation amount is greater than the maximum refrigerant amount threshold value, it is determined that the refrigerant circulation amount is excessive.

6. The method of claim 5, wherein, The establishment of the refrigerant amount threshold value mapping relationship table of refrigerant amount and working condition includes: A plurality of test environment temperature points and a plurality of test load degrees are set to combine a plurality of test working conditions; For each test working condition, the refrigerator refrigeration system is operated at different refrigerant circulation amounts, and system performance parameters under each refrigerant circulation amount are collected and recorded; The system performance parameters of each test working condition are analyzed to determine the corresponding minimum refrigerant amount threshold value and the maximum refrigerant amount threshold value under each test working condition; The test environment temperature points, the test load degrees, and the corresponding minimum refrigerant amount threshold value and the maximum refrigerant amount threshold value under all test working conditions are associated and stored to form the refrigerant amount threshold value mapping relationship table.

7. The method of claim 6, wherein, The analysis of the system performance parameters of each test working condition, the determination of the corresponding minimum refrigerant threshold and the maximum refrigerant threshold under each test working condition, comprises: Draw the energy consumption change curve of the system energy consumption with the refrigerant circulation amount under the corresponding test working condition, and select the energy consumption minimum point from the energy consumption change curve; Based on the energy consumption minimum point, select the energy consumption second point from the energy consumption change curve combined with the preset percentage, and set the refrigerant circulation amount corresponding to the energy consumption second point as the maximum refrigerant threshold; Draw the refrigeration time change curve of the refrigeration time with the refrigerant circulation amount under the corresponding test working condition, and select the inflection point of the refrigeration time from the refrigeration time change curve to determine the first circulation amount; Draw the exhaust temperature change curve of the compressor exhaust temperature with the refrigerant circulation amount under the corresponding test working condition, and select the inflection point of the exhaust temperature from the exhaust temperature change curve, or the refrigerant circulation amount corresponding to the preset safety temperature limit value, and set it as the second circulation amount; Take the larger value of the first circulation amount and the second circulation amount, and obtain the minimum refrigerant threshold combined with the preset safety margin.

8. The method of claim 5, wherein, The switching of the first switching valve, the second switching valve and the third switching valve in the three-way switching valve according to the supply-demand matching condition, so that the refrigerant regulator adjusts the storage and release of the refrigerant in the refrigerator refrigeration process, comprises: When the refrigerant circulation amount supply-demand matches, switch the three-way switching valve to the first switching valve, so that the refrigerant flows to the evaporator for refrigeration; When the refrigerant circulation amount is insufficient, switch the three-way switching valve to the second switching valve, so that the refrigerant regulator releases the refrigerant; When the refrigerant circulation amount is excessive, switch the three-way switching valve to the third switching valve, so that the refrigerant regulator stores the refrigerant.

9. The method of claim 8, wherein, The storage and release of the refrigerant comprises: Obtain the ambient temperature to determine the basic refrigerant circulation amount of the refrigerator refrigeration system; Based on the ambient temperature and the basic refrigerant circulation amount, determine the refrigerant amount difference of the refrigerator refrigeration system combined with the target temperature of the refrigerator; Based on the refrigerant amount difference, determine the refrigerant amount of the refrigerant regulator for storage or release combined with the maximum refrigerant threshold or the minimum refrigerant threshold.

10. A control system of a variable-charge refrigerator for realizing the control method of the variable-charge refrigerator according to any one of claims 4 to 9, characterized by Comprise: The first processing module is used to obtain the volume flow of the refrigerant in the pure liquid state and the liquid flow between the evaporator, and determine the real-time refrigerant circulation amount of the refrigerator refrigeration system; The second processing module is used to determine the supply-demand matching condition of the refrigerant circulation amount in the refrigerator refrigeration system based on the preset refrigerant threshold combined with the real-time refrigerant circulation amount; The third processing module is used to switch the first switching valve, the second switching valve and the third switching valve in the three-way switching valve according to the supply-demand matching condition, so that the refrigerant regulator adjusts the storage and release of the refrigerant in the refrigerator refrigeration process.

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