A control method of a refrigeration system and a refrigeration system

Abstract

This application aims to provide a control method and a refrigeration system for a refrigeration system, belonging to the field of refrigeration technology. The control method includes: assisted defrosting: In a preset defrosting mode, a first switching valve is controlled to connect the compressor's output end and a corresponding exhaust defrosting pipe so that the refrigerant output from the compressor flows through the corresponding exhaust defrosting pipe through the refrigerated evaporator and back to the compressor; the compressor's output end is connected to the first inlet of the first switching valve, and the exhaust defrosting pipe is connected to the corresponding first outlet of the first switching valve, with at least two first outlets used to selectively connect to the first inlet; heated defrosting: During the process of the refrigerant output from the compressor flowing through the corresponding exhaust defrosting pipe through the refrigerated evaporator, a defrosting heater is controlled to heat the refrigerated evaporator. The high-temperature refrigerant output from the compressor flows into the exhaust defrosting pipe and through the refrigerated evaporator, cooperating with the defrosting heater to heat and defrost the refrigerated evaporator, reducing refrigerant liquefaction and reducing the possibility of compressor damage due to liquid refrigerant impact.

Description

Technical Field

[0001] This application relates to the field of refrigeration technology, and in particular to a control method for a refrigeration system and a refrigeration system. Background Technology

[0002] Refrigeration systems achieve cooling by using refrigerant to absorb heat through the evaporator. During prolonged cooling, frost will condense on the evaporator surface, requiring defrosting. However, in some technologies, the defrosting process may damage the compressor. Summary of the Invention

[0003] In view of this, embodiments of this application provide a control method and a refrigeration system for a refrigeration system to reduce the possibility of compressor damage.

[0004] This application provides a control method for a refrigeration system. The refrigeration system includes a compressor, a first switching valve, a main refrigeration path, a refrigeration evaporator, a freezing evaporator, a defrost heater, and at least one exhaust defrost pipe. The first switching valve has a first inlet and at least two first outlets. The first switching valve is used to selectively connect one of the at least two first outlets to the first inlet. The first inlet is connected to the output end of the compressor. The input end of the main refrigeration path is connected to one of the first outlets. The refrigerant in the main refrigeration path flows back to the compressor via the refrigeration evaporator and / or the freezing evaporator. The defrost heater is used to heat the freezing evaporator. Each exhaust defrost pipe is connected to a corresponding first outlet. The refrigerant in at least one exhaust defrost pipe flows back to the compressor via the freezing evaporator. The refrigeration system operates in two modes: a refrigeration mode and a defrost mode. The defrost mode includes a preset defrost mode. The control method includes:

[0005] Assisted defrosting: In the preset defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the corresponding exhaust defrosting pipe so that the refrigerant output by the compressor flows through the refrigeration evaporator via the corresponding exhaust defrosting pipe and returns to the compressor. The output end of the compressor is connected to the first inlet of the first switching valve, and the exhaust defrosting pipe is connected to the corresponding first outlet of the first switching valve. At least two of the first outlets are used to selectively connect to the first inlet.

[0006] Heating defrost: During the process of the refrigerant output from the compressor flowing through the refrigeration evaporator via the corresponding exhaust defrost pipe, the defrost heater is controlled to heat the refrigeration evaporator.

[0007] In some embodiments, one of the defrosting pipes is a first defrosting pipe, which is connected in series between the corresponding first outlet of the first switching valve and the input of the evaporator; the auxiliary defrosting step includes:

[0008] Defrosting: In the preset defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the first exhaust defrosting pipe so that the refrigerant output by the compressor flows through the refrigeration evaporator.

[0009] In some embodiments, one of the defrosting pipes is a second defrosting pipe, which is connected in series between the first outlet of the first switching valve and the input of the refrigeration evaporator, and the refrigeration evaporator is connected in series between the output of the refrigeration evaporator and the input of the compressor; prior to the refrigeration defrosting step, the auxiliary defrosting step further includes:

[0010] Common defrosting: In the preset defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the second exhaust defrosting pipe so that the refrigerant output by the compressor flows sequentially through the refrigeration evaporator and the freezing evaporator.

[0011] In some embodiments, the compressor rotates at a higher speed during the common defrosting step than during the freeze defrosting step.

[0012] In some embodiments, one of the defrosting pipes is a second defrosting pipe, which is connected in series between the first outlet of the first switching valve and the input of the refrigeration evaporator. The refrigeration evaporator and the freezing evaporator are connected in parallel, and the refrigeration evaporator and the freezing evaporator are respectively connected in series with the compressor. Before the freezing defrosting step, the control method further includes:

[0013] Refrigeration defrosting: In the defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the second exhaust defrosting pipe so that the refrigerant output by the compressor flows back to the compressor via the refrigeration evaporator.

[0014] In some embodiments, the compressor rotates at a higher speed during the refrigerated defrosting step than during the frozen defrosting step.

[0015] In some embodiments, the control method further includes:

[0016] During the defrosting process, the refrigeration fan is activated to direct airflow from the freezer compartment to the refrigeration evaporator.

[0017] In some embodiments, the control method further includes:

[0018] When the difference between the temperature of the freezer compartment and the temperature of the refrigerant measured by the freezer temperature measuring device is less than or equal to a first preset value, the freezer fan is turned off and the defrost heater is turned on in the defrost mode. The freezer temperature measuring device is connected to the output end of the freezer evaporator and is connected in parallel with the refrigeration evaporator.

[0019] In some embodiments, the condition for performing the defrosting step is that the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to a first preset temperature, wherein the refrigeration temperature measuring device is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator.

[0020] In some embodiments, the control method further includes:

[0021] During the process of the refrigerant output from the compressor flowing through the second exhaust defrosting pipe into the refrigeration evaporator, the auxiliary heater is controlled to heat the water receiving device to melt the frost that falls into the water receiving device during the defrosting process of the refrigeration evaporator.

[0022] In some embodiments, the control method further includes:

[0023] If the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the first preset temperature, the auxiliary heater is turned off. The refrigeration temperature measuring device is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator.

[0024] In some embodiments, the defrosting step includes:

[0025] Periodic defrosting: When the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the second preset temperature, the defrosting heater is controlled to periodically heat the refrigeration evaporator as the refrigerant output from the compressor flows through the corresponding exhaust defrosting pipe. The total duration of one heating cycle of the defrosting heater is a first preset duration. The defrosting heater heats for a second preset duration within one heating cycle, and stops heating for a third preset duration within one heating cycle. The first preset duration is equal to the sum of the second preset duration and the third preset duration. The refrigeration temperature measuring device is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator.

[0026] In some embodiments, the compressor rotates at a higher speed during the defrosting step than during the periodic defrosting step.

[0027] In some embodiments, the control method further includes:

[0028] If the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the third preset temperature, the compressor and the defrost heater shall be turned off.

[0029] After the compressor is turned off, the first switching valve is controlled to connect the output end of the compressor and the main refrigeration path so that the working mode of the refrigeration system is switched from the defrosting mode to the refrigeration mode. The input end of the main refrigeration path is connected to the corresponding first outlet. The condenser is connected in series on the main refrigeration path. The main refrigeration path is connected in series with the refrigeration evaporator and the freezing evaporator respectively.

[0030] In some embodiments, the refrigeration system includes a compressor, a first switching valve, a main refrigeration path, a refrigeration evaporator, a freezing evaporator, a defrost heater, at least one exhaust defrost pipe, a memory, and a processor;

[0031] The first switching valve has a first inlet and at least two first outlets. The first switching valve is used to connect at least one of the two first outlets to the first inlet. The first inlet is connected to the output end of the compressor, and the input end of the refrigeration main flow is connected to one of the first outlets.

[0032] The refrigerant in the main refrigeration path flows back to the compressor via the refrigeration evaporator and / or the freezing evaporator;

[0033] The defrosting heater is used to heat the refrigeration evaporator. Each of the exhaust defrosting pipes is connected to the corresponding first outlet. The refrigerant in at least one of the exhaust defrosting pipes flows back to the compressor via the refrigeration evaporator.

[0034] The memory stores a computer program, and the processor executes the computer program to implement the steps of the control method described above.

[0035] This application provides a control method for a refrigeration system. In a preset defrost mode, a first switching valve connects the compressor output and the exhaust defrost pipe. The high-temperature gaseous refrigerant output from the compressor flows into the corresponding exhaust defrost pipe and passes through the evaporator. After heat exchange with the evaporator, the refrigerant returns to the compressor. The higher-temperature refrigerant passing through the evaporator pipes allows the heat of the refrigerant to be fully absorbed by the frost covering the evaporator pipes, achieving more uniform defrosting and reducing heat loss. During the compressor's exhaust defrosting process on the evaporator, a defrost heater is used to heat the evaporator, increasing its temperature. This not only accelerates the defrosting efficiency but also prevents the refrigerant temperature from dropping too much as it flows through the evaporator, reducing refrigerant liquefaction and minimizing liquid refrigerant impact on the compressor. The defrost heater and the compressor output refrigerant work together to defrost the evaporator. The defrost heater's heating capacity can be relatively small, reducing heat loss from the defrost heater to the freezer compartment. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a refrigeration system according to an embodiment of this application. The diagram shows a refrigeration evaporator and a freezing evaporator connected in parallel. The diagram also shows a first exhaust defrosting pipe and a second exhaust defrosting pipe.

[0037] Figure 2 This is a schematic diagram of a refrigeration system according to an embodiment of this application. The diagram shows a refrigeration evaporator and a freezing evaporator connected in series. The diagram also shows a first exhaust defrosting pipe and a second exhaust defrosting pipe.

[0038] Figure 3 This is a schematic diagram of a refrigeration system according to an embodiment of this application. The figure shows a refrigeration evaporator and a freezing evaporator connected in series, and the figure also shows a second exhaust defrosting pipe.

[0039] Figure 4 This is a schematic diagram of a refrigeration system according to an embodiment of this application. The figure shows a refrigeration evaporator and a freezing evaporator connected in series, and the figure shows a first exhaust defrosting pipe.

[0040] Figure 5 This is a schematic diagram of the steps of the control method of the refrigeration system according to an embodiment of the present application, showing step S2;

[0041] Figure 6 This is a schematic diagram of the steps of the control method of the refrigeration system according to an embodiment of the present application, showing step S3;

[0042] Figure 7 This is a schematic diagram of the steps of the control method of the refrigeration system according to an embodiment of the present application, showing step S12;

[0043] Figure 8 This is a flowchart illustrating the control method of the refrigeration system according to an embodiment of this application, showing the refrigerant in the exhaust defrosting pipe defrosting the refrigeration evaporator and the refrigerator evaporator.

[0044] Figure 9 This is a flowchart illustrating the control method of the refrigeration system according to an embodiment of this application. The refrigerant in the exhaust defrosting pipe defrosts only the refrigeration evaporator.

[0045] Explanation of reference numerals in the attached figures

[0046] 1. Compressor; 2. Refrigeration evaporator; 3. Freezing evaporator; 4. Defrosting heater; 51. First exhaust defrosting pipe; 52. Second exhaust defrosting pipe; 6. First switching valve; 61. First inlet; 62. First outlet; 7. Second switching valve; 71. Second inlet; 72. Second outlet; 8. Main refrigeration path; 81. First refrigeration branch; 82. Second refrigeration branch; 9. Main return path; 91. First return branch; 10. Condenser; 11. Check valve; 12. Throttling device; 13. Dryer filter; 14. Auxiliary heater; 15. Refrigeration temperature measuring device; 16. Freezing temperature measuring device; 17. Fan; 18. Connecting pipe. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0048] The specific technical features described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different combinations of specific technical features can form different embodiments and technical solutions. To avoid unnecessary repetition, the various possible combinations of the specific technical features in this application will not be described separately.

[0049] In the following description, the terms "first," "second," etc., are used merely to distinguish different objects and do not indicate that the objects have the sameness or relationship. It should be understood that the directional descriptions "above," "below," "outside," and "inside" refer to the directions in normal use, while "left" and "right" refer to the left and right directions shown in the corresponding diagrams, which may or may not be the left and right directions in normal use.

[0050] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. "A plurality of" means two or more.

[0051] In related technologies, during the refrigeration process, the refrigerant output from the compressor enters the evaporator through the condenser body for refrigeration. When the compressor is defrosting the evaporator, the higher-temperature gaseous refrigerant output from the compressor enters the evaporator's pipes to defrost the evaporator surface, and then flows back to the compressor. However, because the temperature of the refrigeration evaporator is low, for example, less than or equal to -25°C, the temperature of the gaseous refrigerant output from the compressor drops significantly after flowing through it, causing the refrigerant to liquefy. The liquid refrigerant flowing back to the compressor can cause a shock to the compressor, making it prone to damage.

[0052] In some embodiments, please refer to Figures 1-4 The refrigeration system includes a compressor 1, a first switching valve 6, a main refrigeration path 8, a refrigeration evaporator 2, a freezing evaporator 3, a defrost heater 4, and at least one exhaust defrost pipe. The first switching valve 6 has a first inlet 61 and at least two first outlets 62. The first switching valve 6 is used to connect one of the at least two first outlets 62 to the first inlet 61. The first inlet 61 is connected to the output end of the compressor 1. The input end of the main refrigeration path 8 is connected to one of the first outlets 62. The refrigerant in the main refrigeration path 8 flows back to the compressor 1 through the refrigeration evaporator 2 and / or the freezing evaporator 3. The defrost heater 4 is used to heat the freezing evaporator 3. Each exhaust defrost pipe is connected to a corresponding first outlet 62. The refrigerant in at least one exhaust defrost pipe flows back to the compressor 1 through the freezing evaporator 3.

[0053] For example, the number of first outlets 62 is not limited; there can be two, three, or four first outlets 62.

[0054] For example, the number of second outlets 72 is not limited; there may be two, three, or four second outlets 72.

[0055] Understandably, the other end of the first refrigeration branch 81 is connected to the refrigeration evaporator 2.

[0056] For example, the temperature of the refrigerated evaporator 2 is relatively higher than that of the frozen evaporator 3, for example, the temperature of the refrigerated evaporator 2 is less than or equal to minus 10 degrees Celsius.

[0057] For example, the first switching valve 6 is an electrically operated switching valve.

[0058] For example, the second switching valve 7 is an electrically operated switching valve.

[0059] In this embodiment, when the first inlet 61 of the first switching valve 6 is connected to the first outlet 62 corresponding to the exhaust defrost pipe, the refrigeration system can defrost. When the first inlet 61 of the first switching valve 6 is connected to the first outlet 62 corresponding to the input end of the refrigeration main flow path 8, the refrigeration system can refrigerate. The first switching valve 6 connects the first inlet 61 to the first outlet 62 corresponding to the exhaust defrost pipe. The high-temperature gaseous refrigerant output by the compressor 1 flows from the first outlet 62 into the exhaust defrost pipe. The high-temperature gaseous refrigerant in at least one exhaust defrost pipe flows through the refrigeration evaporator 3 to defrost the refrigeration evaporator 3. In conjunction with the defrost heater 4, the refrigeration evaporator 3 is heated, increasing the temperature of the refrigeration evaporator 3. This not only accelerates the defrosting efficiency but also ensures that the temperature of the refrigerant does not drop too much when it flows through the refrigeration evaporator 3, reducing refrigerant liquefaction and minimizing the impact of liquid refrigerant on the compressor 1, thereby reducing the possibility of compressor 1 being damaged. The pipes of the evaporator 3 are covered with frost. The high-temperature refrigerant passes through the pipes of the evaporator 3, so that the heat of the refrigerant can be fully absorbed by the frost covering the pipes of the evaporator 3, so as to achieve more uniform defrosting and reduce heat loss. The defrosting heater 4 can have a smaller heating amount for defrosting, thus reducing the heat loss of the defrosting heater 4 to the freezer compartment.

[0060] In some embodiments, please refer to Figures 1-4 The refrigeration system also includes a condenser 10, a second switching valve 7, a first refrigeration branch 81, a second refrigeration branch 82, and a throttling device 12. One end of the main refrigeration branch 8 is connected to one of the first outlets 62. The second switching valve 7 has a second inlet 71 and at least two second outlets 72. The second switching valve 7 is used to connect at least two second outlets 72 to the second inlet 71 and to disconnect the second inlet 71 from the second outlet 72. The other end of the main refrigeration branch 8 is connected to the second inlet 71. The condenser 10 is connected in series with the main refrigeration branch 8. One end of the first refrigeration branch 81 is connected to one of the second outlets 72. One end of the second refrigeration branch 82 is connected to the other second outlet 72. A throttling device 12 is connected in series with the first refrigeration branch 81 and the second refrigeration branch 82, respectively. The refrigerant in the first refrigeration branch 81 flows back to the compressor 1 through the refrigeration evaporator 2, and the refrigerant in the second refrigeration branch 82 flows back to the compressor 1 through the freezing evaporator 3.

[0061] In this embodiment, the first switching valve 6 connects the first inlet 61 to the first outlet 62 corresponding to the main refrigeration path 8, allowing the refrigeration system to perform refrigeration. The refrigerant output from the compressor 1 enters the main refrigeration path 8. The condenser 10 is connected in series with the main refrigeration path 8. The refrigerant flows through the condenser 10, which condenses the refrigerant into a liquid state. The liquid refrigerant flows through the second switching valve 7 into the first refrigeration branch 81 or the second refrigeration branch 82. The throttling device 12 reduces the pressure of the liquid refrigerant in the first refrigeration branch 81. The refrigerant in the first refrigeration branch 81 flows through the refrigeration evaporator 2 for refrigeration. After absorbing heat in the refrigeration evaporator 2, the refrigerant flows back to the compressor 1. The throttling device 12 also reduces the pressure of the liquid refrigerant in the second refrigeration branch 82. The refrigerant in the second refrigeration branch 82 flows through the freezing evaporator 3 for freezing. After absorbing heat in the freezing evaporator 3, the refrigerant flows back to the compressor 1.

[0062] In some embodiments, please refer to Figures 2-4 The refrigerated evaporator 2 and the frozen evaporator 3 are connected in series between the output end of the first refrigeration branch 81 and the input end of the compressor 1. The second refrigeration branch 82 is connected in series with the frozen evaporator 3 and in parallel with the refrigerated evaporator 2.

[0063] For example, the refrigerant absorbs less heat in the refrigeration evaporator 2 and more heat in the freezing evaporator 3.

[0064] In this embodiment, the second refrigeration branch 82 is connected in series with the refrigeration evaporator 3. The refrigerant in the second refrigeration branch 82 flows through the refrigeration evaporator 3 for refrigeration. The second refrigeration branch 82 is connected in parallel with the refrigeration evaporator 2. The refrigerant in the second refrigeration branch 82 does not flow through the refrigeration evaporator 2. The refrigeration evaporator 2 and the refrigeration evaporator 3 are connected in series between the output end of the first refrigeration branch 81 and the input end of the compressor 1. After the refrigerant in the first refrigeration branch 81 flows through the refrigeration evaporator 2 for refrigeration, it will also flow through the refrigeration evaporator 3 to absorb the heat in the refrigeration evaporator 3, and then flow back to the compressor 1. This fully utilizes the cold energy of the refrigerant in the first refrigeration branch 81 to refrigerate the refrigeration evaporator 3. It can also perform refrigeration during refrigeration, which is beneficial to improving the refrigeration efficiency of the refrigeration system.

[0065] It is understood that the refrigeration evaporator 2 and the freezing evaporator 3 are not limited to being connected in series. Exemplarily, the refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel.

[0066] In some embodiments, please refer to Figure 2 and Figure 4 One of the exhaust defrosting pipes is the first exhaust defrosting pipe 51, which is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 3. The other end of the second refrigeration branch 82 is connected to the first exhaust defrosting pipe 51.

[0067] It should be noted that the refrigeration system also includes a connecting pipe 18 connecting the refrigeration evaporator 2 and the freezing evaporator 3, and one end of the first exhaust defrosting pipe 51 is connected to the connecting pipe 18.

[0068] In this embodiment, the first exhaust defrosting pipe 51 is connected in series between the corresponding first outlet 62 and the input end of the evaporator 3. The high-temperature refrigerant output by the compressor 1 enters the first exhaust defrosting pipe 51 from the first outlet 62. The refrigerant in the first exhaust defrosting pipe 51 releases heat to defrost the evaporator 3. In conjunction with the defrosting heater 4, the evaporator 3 is heated, which can not only speed up the defrosting of the evaporator 3, but also prevent the temperature of the refrigerant in the exhaust defrosting pipe from dropping too much when it flows through the evaporator 3, thereby reducing the liquefaction of the refrigerant in the exhaust defrosting pipe and reducing the impact of the liquid refrigerant on the compressor 1.

[0069] In some embodiments, please refer to Figure 2 and Figure 3 One of the exhaust defrosting pipes is the second exhaust defrosting pipe 52, which is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 2.

[0070] It should be noted that one end of the second exhaust defrosting pipe 52 is connected to the first refrigeration branch 81, and the connection position between the second exhaust defrosting pipe 52 and the first refrigeration branch 81 is located between the throttle 12 on the first refrigeration branch 81 and the input end of the refrigeration evaporator 2.

[0071] In this embodiment, the second defrosting pipe 52 is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 2. The high-temperature refrigerant output by the compressor 1 enters the second defrosting pipe 52 from the first outlet 62. The refrigerant in the second defrosting pipe 52 releases heat to defrost the refrigeration evaporator 2. The refrigeration evaporator 2, the freezer evaporator 3 and the compressor 1 are connected in series. The refrigerant flowing out of the refrigeration evaporator 2 will pass through the freezer evaporator 3. The temperature of the freezer evaporator 3 is lower. The defrosting heater 4 can heat the refrigerant flowing through the freezer evaporator 3 to prevent the temperature of the refrigerant from dropping too much when it flows through the freezer evaporator 3. During the defrosting process of the refrigeration evaporator, the refrigerant is heated by the defrosting heater 4 and then flows back to the compressor 1, reducing the refrigerant liquefaction and reducing the possibility of liquid refrigerant impacting the compressor 1.

[0072] It is understandable that the refrigeration system may not need to have a second exhaust defrosting pipe 52.

[0073] In some embodiments, please refer to Figure 3 The refrigeration system also includes a connecting pipe 18 connecting the refrigeration evaporator 2 and the freezing evaporator 3, and the other end of the second refrigeration branch 82 is connected to the connecting pipe 18.

[0074] In this embodiment, the other end of the second refrigeration branch 82 is connected to the connecting pipe 18 to realize the series connection between the second refrigeration branch 82 and the freezer evaporator 3, and the parallel connection between the second refrigeration branch 82 and the refrigerator evaporator 2. The refrigerant of the second exhaust defrost pipe 52 flows through the refrigerator evaporator 2 and the freezer evaporator 3 in sequence. The refrigerant of the second exhaust defrost pipe 52 can also help the freezer evaporator 3 defrost. A first exhaust defrost pipe 51 can be set between the input end of the freezer evaporator 3 and the first outlet 62, or it can be omitted. The setting of the first exhaust defrost pipe 51 is relatively flexible.

[0075] It is understood that the refrigeration system is not limited to having a connecting pipe 18. For example, the refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel, the refrigeration system does not have a connecting pipe 18, and the other end of the second refrigeration branch 82 is connected to the exhaust defrost pipe.

[0076] In some embodiments, please refer to Figure 2 One of the exhaust defrosting pipes is the first exhaust defrosting pipe 51, which is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 3. The other end of the second refrigeration branch 82 is connected to the first exhaust defrosting pipe 51. One of the exhaust defrosting pipes is the second exhaust defrosting pipe 52, which is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 2.

[0077] In this embodiment, the first defrost pipe 51 is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 3, and defrosts the refrigeration evaporator 3. The second defrost pipe 52 is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 2, and defrosts the refrigeration evaporator 2 in a refrigerated manner. The refrigerant in both the first and second defrost pipes flows through the refrigeration evaporator 3 and then back to the compressor 1. The defrost heater 4 heats the refrigeration evaporator 3, ensuring that the temperature of the refrigerant at the input end of the compressor 1 is not too low, thus reducing refrigerant liquefaction. By setting the first defrost pipe 51 and the second defrost pipe 52, the refrigeration system can perform both refrigeration and refrigeration defrost. The defrost heater 4 can reduce the impact of liquid refrigerant on the compressor 1 during both refrigeration and refrigeration defrost processes.

[0078] It is understood that the other end of the second refrigeration branch 82 is not limited to being connected to the first exhaust defrosting pipe 51. Exemplarily, the other end of the second refrigeration branch 82 is connected to the connecting pipe 18.

[0079] In some embodiments, please refer to Figure 1The refrigerated evaporator 2 is connected in series between the first refrigeration branch 81 and the input end of the compressor 1, and the frozen evaporator 3 is connected in series between the second refrigeration branch 82 and the input end of the compressor 1. The refrigerated evaporator 2 and the frozen evaporator 3 are connected in parallel.

[0080] In this embodiment, the refrigerated evaporator 2 and the frozen evaporator 3 are connected in parallel. The refrigerated evaporator 2 and the frozen evaporator 3 respectively perform defrosting and degassing, making defrosting more flexible. The defrosting heater 4 heats the frozen evaporator 3, raising the temperature of the frozen evaporator 3 and reducing the liquefaction of the refrigerant flowing through the frozen evaporator 3. The frozen degassing and defrosting combined with the heating of the defrosting heater 4 reduces the impact of the returned liquid refrigerant on the compressor 1.

[0081] It is understood that the refrigeration evaporator 2 and the freezing evaporator 3 are not limited to being connected in parallel. For example, the refrigeration evaporator 2 and the freezing evaporator 3 are connected in series.

[0082] In some embodiments, please refer to Figure 1 The refrigeration system also includes a first return branch 91, a main return branch 9, and a one-way valve 11. The first return branch 91 and the main return branch 9 are connected in series between the output end of the refrigeration evaporator 3 and the input end of the compressor 1. The first return branch 91 is connected in parallel with the refrigeration evaporator 2. The main return branch 9 is connected in series between the output end of the refrigeration evaporator 2 and the input end of the compressor 1. The one-way valve 11 is connected in series on the first return branch 91 to restrict the refrigerant from flowing back to the refrigeration evaporator 3.

[0083] Understandably, the one-way valve 11 is connected to one side of the output end of the refrigeration evaporator 3.

[0084] In this embodiment, the main return path 9 is connected in series between the output end of the refrigerated evaporator 2 and the input end of the compressor 1. The refrigerant flowing out of the refrigerated evaporator 2 flows into the main return path 9 and then back to the compressor 1. The first return branch 91 and the main return path 9 are connected in series between the output end of the refrigerated evaporator 3 and the input end of the compressor 1. The refrigerant flowing out of the refrigerated evaporator 3 flows into the first return branch 91 and then into the main return path 9, and then back to the compressor 1. The one-way valve 11 is connected in series on the first return branch 91, so that the refrigerant can only flow from the first return branch 91 to the main return path 9, and the refrigerant cannot flow from the main return path 9 to the first return branch 91. The one-way valve 11 restricts the flow of the refrigerant flowing out of the refrigerated evaporator 2 to the first return branch 91, thereby restricting the refrigerant flowing out of the refrigerated evaporator 2 from flowing back into the refrigerated evaporator 3.

[0085] It is understood that the refrigeration system is not limited to having a one-way valve 11. For example, the refrigeration system does not have a one-way valve 11, and the first return branch 91 is directly connected to the main return branch 9.

[0086] In some embodiments, please refer to Figure 1One of the exhaust defrosting pipes is the first exhaust defrosting pipe 51, which is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 3. The other end of the second refrigeration branch 82 is connected to the first exhaust defrosting pipe 51.

[0087] In this embodiment, the first exhaust defrosting pipe 51 is connected in series between the corresponding first outlet 62 and the input end of the evaporator 3. The high-temperature refrigerant output by the compressor 1 enters the first exhaust defrosting pipe 51 from the first outlet 62. The high-temperature refrigerant in the first exhaust defrosting pipe 51 flows through the evaporator 3 for defrosting. The defrosting heater 4 can heat the evaporator 3 and increase its temperature, which can not only speed up the defrosting efficiency, but also prevent the temperature of the refrigerant flowing through the evaporator 3 from dropping too much, thus reducing refrigerant liquefaction. The first exhaust defrosting pipe 51, together with the defrosting heater 4, defrosts the evaporator 3, reducing the impact of the backflowing liquid refrigerant on the compressor 1.

[0088] In some embodiments, please refer to Figure 1 One of the exhaust defrosting pipes is the second exhaust defrosting pipe 52, which is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 2.

[0089] In this embodiment, the second defrosting pipe 52 is connected in series between the corresponding first outlet 62 and the input end of the refrigeration evaporator 2. The high-temperature refrigerant output by the compressor 1 flows into the second defrosting pipe 52 from the first outlet 62. The refrigerant in the second defrosting pipe 52 flows through the refrigeration evaporator 2 for refrigeration defrosting. The refrigerant flowing out of the refrigeration evaporator 2 flows back to the compressor 1. The refrigeration evaporator 2 is connected in parallel with the freezer evaporator 3. The refrigerant flowing out of the refrigeration evaporator 2 will not be heated by the defrosting heater 4. The temperature of the refrigeration evaporator 2 is relatively high. The high-temperature refrigerant output by the compressor 1 will not liquefy after passing through the refrigeration evaporator 2. This can reduce the impact of liquid refrigerant on the compressor 1 without heating.

[0090] It is understood that the refrigeration system may not have a second defrost pipe 52. For example, the refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel, and the first defrost pipe 51 is connected in series between the corresponding first outlet 62 and the input end of the freezing evaporator 3. The first switching valve 6 has two first outlets 62, one of which is connected to the first defrost pipe 51, and the other is connected to one end of the main refrigeration path 8. The refrigerant in the first defrost pipe 51 flows back to the compressor 1 through the freezing evaporator 3, and the refrigeration evaporator 2 defrosts naturally.

[0091] In some embodiments, the refrigeration system includes a dryer filter 13 connected in series on the main refrigeration path 8.

[0092] In some embodiments, the auxiliary heater 14 is an aluminum foil heating wire used to heat the water receiving device of the refrigerated evaporator 2 to reduce frost buildup in the water receiving device that may clog the drain outlet.

[0093] In some embodiments, the refrigeration temperature measuring device 15 is a refrigeration temperature sensor, which is used to measure the temperature of the refrigeration evaporator 2.

[0094] In some embodiments, the freezing temperature measuring device 16 is a freezing temperature sensor, which is used to measure the temperature of the freezing evaporator 3.

[0095] In some embodiments, the refrigeration system includes a fan 17, which is respectively disposed at the refrigeration evaporator 2 and the freezing evaporator 3.

[0096] In some embodiments, the refrigeration system is a refrigerator.

[0097] This application provides a control method for a refrigeration system. Please refer to 1 to 2023. Figure 5 The refrigeration system includes a compressor 1, a first switching valve 6, a main refrigeration path 8, a refrigeration evaporator 2, a freezing evaporator 3, a defrost heater 4, and at least one exhaust defrost pipe. The first switching valve 6 has a first inlet 61 and at least two first outlets 62. The first switching valve 6 is used to connect one of the at least two first outlets 62 to the first inlet 61. The first inlet 61 is connected to the output end of the compressor 1. The input end of the main refrigeration path 8 is connected to one of the first outlets 62. The refrigerant in the main refrigeration path 8 flows back to the compressor 1 via the refrigeration evaporator 2 and / or the freezing evaporator 3. The defrost heater 4 is used to heat the freezing evaporator 3. Each exhaust defrost pipe is connected to a corresponding first outlet 62. The refrigerant in at least one exhaust defrost pipe flows back to the compressor 1 via the freezing evaporator 3.

[0098] The refrigeration system operates in two modes: cooling mode and defrosting mode. The defrosting mode includes preset defrosting modes, and the control methods include:

[0099] Step S1: Assisted defrosting: In the preset defrosting mode, control the first switching valve 6 to connect the output end of the compressor 1 and the corresponding exhaust defrosting pipe so that the refrigerant output by the compressor 1 flows through the corresponding exhaust defrosting pipe through the freezer evaporator 3 and returns to the compressor 1.

[0100] The output end of the compressor 1 is connected to the first inlet 61 of the first switching valve 6, and the exhaust defrosting pipe is connected to the corresponding first outlet 62 of the first switching valve 6. At least two first outlets 62 are used to selectively connect to the first inlet 61.

[0101] Step S2: Heating and defrosting: During the process of the refrigerant output from the compressor 1 flowing through the corresponding exhaust defrosting pipe to the refrigeration evaporator 3, the defrosting heater 4 is controlled to heat the refrigeration evaporator 3.

[0102] It should be noted that the preset defrost mode is the defrost mode in which the refrigerant output by compressor 1 flows through the refrigeration evaporator 3.

[0103] In this embodiment, under the preset defrosting mode, the first switching valve 6 connects the output end of the compressor 1 and the exhaust defrosting pipe. The high-temperature gaseous refrigerant output by the compressor 1 flows into the corresponding exhaust defrosting pipe and passes through the evaporator 3. After heat exchange with the evaporator 3, the refrigerant flows back to the compressor 1. The higher temperature refrigerant passing through the pipes of the evaporator 3 allows the heat of the refrigerant to be fully absorbed by the frost covering the pipes of the evaporator 3, achieving relatively uniform defrosting and reducing heat loss. During the defrosting process of the compressor 1 exhausting the evaporator 3, the defrosting heater 4 heats the evaporator 3 to increase its temperature. This not only accelerates the defrosting efficiency of the evaporator 3 but also ensures that the temperature of the refrigerant does not drop too much when it flows through the evaporator 3, reducing refrigerant liquefaction and minimizing the impact of liquid refrigerant on the compressor 1. The defrosting heater 4 and the refrigerant output from the compressor 1 work together to defrost the refrigeration evaporator 3. The defrosting heating amount of the defrosting heater 4 can be relatively small, reducing the heat loss of the defrosting heater 4 to the freezer compartment.

[0104] In some embodiments, please refer to Figure 1 , Figure 2 , Figure 4 , Figure 6 and Figure 7 One of the defrosting pipes is the first defrosting pipe 51, which is connected in series between the corresponding first outlet 62 of the first switching valve 6 and the input end of the freezer evaporator 3; the auxiliary defrosting steps include:

[0105] Step S11: Defrosting: In the preset defrosting mode, control the first switching valve 6 to connect the output end of the compressor 1 and the first exhaust defrosting pipe 51 so that the refrigerant output by the compressor 1 flows through the refrigeration evaporator 3.

[0106] For example, when the refrigeration system has a short refrigeration time, the refrigeration evaporator 2 will have less frost and will defrost naturally.

[0107] In this embodiment of the application, under the preset defrosting mode, during the freezing defrosting step, the high-temperature refrigerant output by the compressor 1 flows into the first exhaust defrosting pipe 51 and passes through the freezing evaporator 3 to defrost the freezing evaporator 3. The high-temperature refrigerant output by the compressor 1 does not flow through the refrigeration evaporator 2, and the refrigeration evaporator 2 will not consume the heat in the refrigerant. This allows the refrigerant to concentrate on defrosting the freezing evaporator 3 during the freezing defrosting step, resulting in high defrosting efficiency for the freezing evaporator 3.

[0108] In some embodiments, please refer to Figure 2 and Figure 7 One of the defrosting pipes is the second defrosting pipe 52, which is connected in series between the corresponding first outlet 62 of the first switching valve 6 and the input end of the refrigeration evaporator 2. The freezing evaporator 3 is connected in series between the output end of the refrigeration evaporator 2 and the input end of the compressor 1. Before the freezing defrosting step, the auxiliary defrosting step also includes:

[0109] Step S12: Common defrosting: In the preset defrosting mode, control the first switching valve 6 to connect the output end of the compressor 1 and the second exhaust defrosting pipe 52 so that the refrigerant output by the compressor 1 flows through the refrigeration evaporator 2 and the freezing evaporator 3 in sequence.

[0110] In this embodiment, the second defrosting pipe 52 is connected in series between the corresponding first outlet 62 of the first switching valve 6 and the input end of the refrigeration evaporator 2. The freezing evaporator 3 is connected in series between the output end of the refrigeration evaporator 2 and the input end of the compressor 1. The high-temperature refrigerant output from the compressor 1 flows into the second defrosting pipe 52. The refrigerant in the second defrosting pipe 52 first flows through the refrigeration evaporator 2, then through the freezing evaporator 3 and back to the compressor 1. The refrigerant in the second defrosting pipe 52 defrosts both the freezing evaporator 2 and the freezing evaporator 3. The refrigeration temperature of the refrigeration evaporator 2 is higher than that of the freezing evaporator 3, resulting in less frost buildup on the refrigeration evaporator 2 and less heat consumption during defrosting. In the preset defrosting mode, the joint defrosting allows the refrigerant to defrost both the refrigeration evaporator 2 and the freezing evaporator 3 after defrosting the refrigeration evaporator 2, thus fully utilizing the heat from the refrigerant output from the compressor 1. The common defrosting step is performed before the freezer defrosting step. After the common defrosting step is completed, the freezer defrosting step is performed. When the freezer defrosting step is performed, the refrigerant does not pass through the refrigerator evaporator 2, thus reducing the temperature rise of the refrigerator compartment.

[0111] In some embodiments, the compressor 1 rotates at a higher speed during the common defrosting step than during the freeze defrosting step.

[0112] In this embodiment, during the common defrosting step, the refrigerant output by compressor 1 needs to meet the defrosting requirements of both the refrigeration evaporator 2 and the freezing evaporator 3. This requires the refrigerant to provide a large amount of heat, and compressor 1 needs to operate at a high speed to provide a significant amount of energy. In the freezing defrosting step, the refrigerant only needs to defrost the freezing evaporator 3, and a defrosting heater 4 heats the freezing evaporator 3. The freezing evaporator 3 requires less heat from the refrigerant to defrost, and compressor 1 can meet the energy requirements by operating at a lower speed. Therefore, the speed of compressor 1 can be reduced during the freezing defrosting step, thus reducing the energy consumption of compressor 1.

[0113] It is understood that the rotational speed of compressor 1 in the common defrosting step is not limited to being greater than the rotational speed of compressor 1 in the freezer defrosting step. For example, the rotational speed of compressor 1 in the common defrosting step is equal to the rotational speed of compressor 1 in the freezer defrosting step.

[0114] In some embodiments, please refer to Figure 1 and Figure 6 One of the defrosting pipes is the second defrosting pipe 52, which is connected in series between the corresponding first outlet 62 of the first switching valve 6 and the input end of the refrigeration evaporator 2. The refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel, and the refrigeration evaporator 2 and the freezing evaporator 3 are connected in series with the compressor 1 respectively. Before the freezing defrosting step, the control method also includes:

[0115] Step S3: Refrigeration defrosting: In defrosting mode, control the first switching valve 6 to connect the output end of compressor 1 and the second exhaust defrosting pipe 52 so that the refrigerant output by compressor 1 flows back to compressor 1 through refrigeration evaporator 2.

[0116] It should be noted that when the refrigeration evaporator 2 and the freezing evaporator 3 are connected in series with the compressor 1, the refrigerant flowing out of the refrigeration evaporator 2 flows into the input end of the compressor 1, and the refrigerant flowing out of the freezing evaporator 3 flows into the input end of the compressor 1.

[0117] It should be noted that during defrosting in the refrigerator, the refrigerant output from compressor 1 flows through the refrigerator evaporator 2, but not through the freezer evaporator 3.

[0118] In this embodiment, in defrosting mode, before the freezing defrosting step, during the refrigeration defrosting step, the refrigerant output from compressor 1 flows into the second exhaust defrosting pipe 52, passes through the refrigeration evaporator 2, and then flows back to compressor 1. The refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel. The refrigerant in the second exhaust defrosting pipe 52 does not flow through the freezing evaporator 3. Defrosting of the freezing evaporator 3 does not affect the refrigeration defrosting. The temperature of the refrigeration evaporator 2 is relatively high, and the possibility of refrigerant liquefaction is small, reducing the impact of liquid refrigerant on compressor 1. The defrosting of the freezing evaporator 3 and the defrosting of the refrigeration evaporator 2 do not interfere with each other. The refrigeration defrosting step precedes the freezing defrosting step, and the freezing defrosting step is performed after the refrigeration defrosting is completed. When the freezing defrosting step is performed, the refrigerant does not flow through the refrigeration evaporator 2, reducing the temperature rise of the refrigerator compartment.

[0119] In some embodiments, the compressor 1 rotates at a higher speed during the defrosting step in the refrigeration stage than during the defrosting step in the freezing stage.

[0120] In this embodiment, the compressor 1 operates at a high speed during the refrigeration defrosting step, resulting in a higher temperature of the refrigerant flowing through the refrigeration evaporator 2, which inhibits refrigerant liquefaction and reduces the impact on the compressor 1. During the freezing defrosting step, a defrosting heater 4 heats the freezing evaporator 3, preventing the temperature of the freezing evaporator 3 from becoming too low. This reduces the heat demand on the refrigerant during defrosting, lowering the likelihood of refrigerant liquefaction as it flows through the freezing evaporator 3, and allowing for a suitable reduction in the compressor 1's speed and energy consumption.

[0121] It is understood that the rotational speed of compressor 1 in the refrigeration defrosting step is not necessarily greater than the rotational speed of compressor 1 in the freezer defrosting step. For example, the rotational speed of compressor 1 in the refrigeration defrosting step is equal to the rotational speed of compressor 1 in the freezer defrosting step.

[0122] In some embodiments, please refer to Figure 6 The control methods also include:

[0123] Step S4: During the defrosting process of the refrigerator, start the refrigeration fan 17 to direct the airflow in the freezer compartment to the freezer evaporator 3.

[0124] It should be noted that the freezer room is a space used for freezing and storing food and other items.

[0125] In this embodiment, during the defrosting process, the refrigeration fan 17 blows the airflow in the freezer compartment toward the evaporator 3, using the airflow in the freezer compartment at a higher temperature than the evaporator 3 to heat up the evaporator 3. During the defrosting process, the heat of the refrigerant and the heat of the defrosting heater 4 required for the defrosting of the evaporator 3 are reduced, which helps to reduce the energy consumption required for the defrosting of the evaporator 3.

[0126] It is understood that this is not limited to starting the refrigeration fan 17 to direct airflow from the freezer compartment to the freezer evaporator 3. Exemplarily, the defrost heater 4 is turned on directly to heat the freezer evaporator 3 without starting the refrigeration fan 17.

[0127] In some embodiments, please refer to Figure 6 The control methods also include:

[0128] Step S5: When the difference between the temperature of the freezer compartment and the temperature of the refrigerant measured by the freezer temperature measuring device 16 is less than or equal to the first preset value, the freezer fan 17 is turned off and the defrost heater 4 is turned on in defrost mode.

[0129] The freezing temperature measuring device 16 is connected to the output end of the freezing evaporator 3, and the freezing temperature measuring device 16 is connected in parallel with the refrigeration evaporator 2.

[0130] It should be noted that the temperature of the freezer compartment is determined based on the actual usage of the refrigeration system.

[0131] It should be noted that when the evaporator 3 just begins to defrost, the temperature of the evaporator 3 is lower than the temperature of the freezer compartment, so the refrigeration fan 17 needs to be turned on. Step S5 is before the freezing defrosting step and the heating defrosting step.

[0132] For example, the temperature of the freezer compartment is -20°C, and the temperature of the refrigerant measured by the freezer temperature measuring device 16 is greater than or equal to the temperature of the freezer compartment.

[0133] For example, the first preset value can be 0, 0.1, 1 or 2.

[0134] It should be noted that the refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel. The refrigerant flowing out of the refrigeration evaporator 2 flows directly into the input end of the compressor 1. The refrigerant flowing out of the refrigeration evaporator 2 will not flow towards the freezing evaporator 3. The refrigerant flowing through the freezing temperature measuring device 16 is basically the refrigerant flowing out of the freezing evaporator 3.

[0135] In this embodiment, when the difference between the temperature of the freezer compartment and the temperature of the refrigerant measured by the freezer temperature measuring device 16 is less than or equal to a first preset value, and the temperature of the refrigerant measured by the freezer temperature measuring device 16 is close to the temperature of the freezer compartment, the airflow in the freezer compartment has a small effect on the heating of the freezer evaporator 3. The defrosting heater 4 is turned on to further heat and defrost the freezer evaporator 3, and the freezer fan 17 is turned off to reduce the airflow of the freezer evaporator 3 to the freezer compartment, which would cause the freezer compartment temperature to rise.

[0136] In some embodiments, the condition for performing the defrosting step is that the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to a first preset temperature. The refrigeration temperature measuring device 15 is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator 2.

[0137] It should be noted that a cold storage room is a space used for refrigerating and storing food and other items.

[0138] For example, the refrigeration temperature measuring device 15 is a temperature sensor.

[0139] It should be noted that the refrigeration temperature measuring device 15 is used to measure the temperature of the refrigerant output by the refrigeration evaporator 2. The refrigerant flowing through the refrigeration temperature measuring device 15 is basically the refrigerant discharged from the refrigeration evaporator 2, and there is no refrigerant from other pipelines that merge or split.

[0140] It should be noted that the first preset temperature was determined based on experiments.

[0141] For example, the first preset temperature is greater than the temperature of the refrigerant discharged by the refrigeration evaporator 2 in cooling mode.

[0142] In this embodiment, when the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature, and the temperature of the refrigerant discharged from the refrigeration evaporator 2 is sufficiently high, the defrosting of the refrigeration evaporator 2 is basically completed. After the defrosting of the refrigeration evaporator 2 is completed, the freezing defrosting step begins. The first switching valve 6 connects the first inlet 61 with the first outlet 62 corresponding to the first exhaust defrosting pipe 51, so that the refrigerant output by the compressor 1 flows into the first exhaust defrosting pipe 51 and concentrates on defrosting the freezing evaporator 3, thereby improving the defrosting efficiency of the freezing evaporator 3. The refrigerant output by the compressor 1 will not flow through the refrigeration evaporator 2, reducing the temperature rise in the refrigerator compartment caused by the refrigerant.

[0143] It is understood that the conditions for performing the defrosting step are not limited to the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 being greater than or equal to a first preset temperature. For example, the defrosting step is performed when the refrigeration system switches to defrost mode.

[0144] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 The refrigeration temperature measuring device 15 is connected in series between the refrigeration evaporator 2 and the freezing evaporator 3, and the refrigeration temperature measuring device 15 is connected in parallel with the first exhaust defrosting pipe 51; or, the refrigeration temperature measuring device 15 is connected to the output end of the refrigeration evaporator 2, and the refrigeration temperature measuring device 15 is connected in parallel with the freezing evaporator 3.

[0145] It should be noted that when the refrigeration evaporator 2 and the freezing evaporator 3 are connected in series, the refrigeration temperature measuring device 15 is connected in series between the refrigeration evaporator 2 and the freezing evaporator 3, and the refrigeration temperature measuring device 15 is connected in parallel with the first exhaust defrosting pipe 51; when the refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel, the refrigeration temperature measuring device 15 is connected to the output end of the refrigeration evaporator 2, and the refrigeration temperature measuring device 15 is connected in parallel with the freezing evaporator 3.

[0146] In this embodiment, by arranging the refrigeration temperature measuring device 15 in a suitable position, the refrigeration temperature measuring device 15 can measure the temperature of the refrigerant discharged from the refrigeration evaporator 2, and the temperature measured by the refrigeration temperature measuring device 15 will not be affected by the freezing evaporator 3.

[0147] It is understood that the refrigeration temperature measuring device 15 is not limited to being connected in parallel with the freezer evaporator 3. For example, when the freezer evaporator 3 is connected in parallel with the refrigeration evaporator 2, the refrigeration temperature measuring device 15 is connected in series with the freezer evaporator 3.

[0148] In some embodiments, the first preset temperature is 0°C to 8°C.

[0149] For example, the first preset temperature is 0°C, 2°C, 4°C, 6°C or 8°C.

[0150] In this embodiment of the application, the first preset temperature is set in the range of 0℃ to 8℃. If the temperature measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature, it can be determined that the defrosting of the refrigeration evaporator 2 is basically completed, and the freezing defrosting step is executed.

[0151] It is understood that the first preset temperature is not limited to 0℃ to 8℃. For example, the first preset temperature is less than 0℃, or the first preset temperature is greater than 8℃.

[0152] In some embodiments, please refer to Figure 6 and Figure 7 The control methods also include:

[0153] Step S6: During the process of the refrigerant output from the compressor 1 flowing through the second exhaust defrosting pipe 52 through the refrigerator evaporator 2, the auxiliary heater 14 is controlled to heat the water receiving device to melt the frost that falls into the water receiving device during the defrosting process of the refrigerator evaporator 2.

[0154] For example, the auxiliary heater 14 is an aluminum foil heater.

[0155] For example, the water receiving device is a water receiving tray.

[0156] For example, the water receiving device is located below the refrigeration evaporator 2.

[0157] In this embodiment, during the process of the refrigerant output from the compressor 1 flowing through the second exhaust defrosting pipe 52 through the refrigerated evaporator 2, the high-temperature refrigerant heats the refrigerated evaporator 2, and the frost on the refrigerated evaporator 2 melts and falls from the refrigerated evaporator 2 into the water receiving device. The auxiliary heater 14 heats the water receiving device to melt the frost in the water receiving device into water, which is then discharged from the drain outlet. This reduces the accumulation of frost in the water receiving device and prevents blockage of the drain outlet, thus facilitating thorough defrosting.

[0158] It is understood that the control is not limited to heating the water receiving device with the auxiliary heater 14. For example, the refrigeration system does not have an auxiliary heater 14, and the frost in the water receiving device melts naturally.

[0159] In some embodiments, please refer to Figure 6 and Figure 7 The control methods also include:

[0160] Step S7: If the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature, turn off the auxiliary heater 14.

[0161] The refrigeration temperature measuring device 15 is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator 2.

[0162] In this embodiment, when the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature, the defrosting of the refrigeration evaporator 2 ends, the refrigeration evaporator 2 will not drop frost into the water receiving device, the auxiliary heater 14 is not needed to heat and melt the frost in the water receiving device, and the auxiliary heater 14 is turned off to reduce the temperature rise of the refrigeration compartment caused by the auxiliary heater 14.

[0163] It is understood that the auxiliary heater 14 is not turned off only when the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature. For example, the auxiliary heater 14 is turned off when the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is less than the first preset temperature.

[0164] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 The refrigeration temperature measuring device 15 is connected in series between the refrigeration evaporator 2 and the freezing evaporator 3, and the refrigeration temperature measuring device 15 is connected in parallel with the first exhaust defrosting pipe 51; or, the refrigeration temperature measuring device 15 is connected to the output end of the refrigeration evaporator 2, and the refrigeration temperature measuring device 15 is connected in parallel with the freezing evaporator 3.

[0165] In this embodiment, by arranging the refrigeration temperature measuring device 15 in a suitable position, the refrigeration temperature measuring device 15 can measure the temperature of the refrigerant discharged from the refrigeration evaporator 2, and the temperature measured by the refrigeration temperature measuring device 15 will not be affected by the freezing evaporator 3.

[0166] It is understood that the refrigeration temperature measuring device 15 is not limited to being connected in parallel with the freezer evaporator 3. For example, when the freezer evaporator 3 is connected in parallel with the refrigeration evaporator 2, the refrigeration temperature measuring device 15 is connected in series with the freezer evaporator 3.

[0167] In some embodiments, the first preset temperature is 0°C to 8°C.

[0168] For example, the first preset temperature is 0°C, 2°C, 4°C, 6°C or 8°C.

[0169] In this embodiment, the first preset temperature is set in the range of 0℃ to 8℃. If the temperature measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature, it can be determined that the defrosting of the refrigeration evaporator 2 is basically completed, and the auxiliary heater 14 can be turned off.

[0170] It is understood that the first preset temperature is not limited to 0℃ to 8℃. For example, the first preset temperature is less than 0℃, or the first preset temperature is greater than 8℃.

[0171] In some embodiments, please refer to Figure 6 The defrosting process includes:

[0172] Step S21: Periodic defrosting: When the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the second preset temperature, the defrosting heater 4 is controlled to periodically heat the refrigeration evaporator 3 as the refrigerant output from the compressor 1 flows through the corresponding exhaust defrosting pipe.

[0173] The total duration of one heating cycle of the defrosting heater 4 is the first preset duration. The defrosting heater 4 heats for a second preset duration within one heating cycle and stops heating for a third preset duration within one heating cycle. The first preset duration is equal to the sum of the second preset duration and the third preset duration. The refrigeration temperature measuring device 16 is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator 3.

[0174] It should be noted that the second preset temperature was determined based on experiments.

[0175] For example, the freezing temperature measuring device 16 is a temperature sensor.

[0176] It should be noted that the refrigeration temperature measuring device 16 is used to measure the refrigerant output by the refrigeration evaporator 3. The refrigerant flowing through the refrigeration temperature measuring device 16 is basically the refrigerant discharged from the refrigeration evaporator 3, and there is no refrigerant that is combined or split.

[0177] For example, the first preset duration is 20 seconds, 50 seconds, or 120 seconds. The second preset duration is 10 seconds, 20 seconds, or 60 seconds. The third preset duration is 10 seconds, 30 seconds, or 60 seconds.

[0178] For example, the defrost heater 4 is located below the freezer evaporator 3.

[0179] In this embodiment, after performing the freezing defrosting step and the heating defrosting step, the frost on the freezing evaporator 3 melts, the frost on the freezing evaporator 3 decreases, and the refrigerant temperature measured by the freezing temperature measuring device 16 increases. When the refrigerant temperature measured by the freezing temperature measuring device 16 is greater than or equal to the second preset temperature, the defrosting of the lower part of the freezing evaporator 3 is completed, the heat required for defrosting the freezing evaporator 3 decreases, the defrosting heater 4 is controlled to heat the freezing evaporator 3 for a second preset time, and the defrosting heater 4 is controlled to stop heating the freezing evaporator 3 for a third preset time. The heat of the defrosting heater 4 rises, and together with the refrigerant in the first exhaust defrosting pipe 51, the upper part of the freezing evaporator 3 continues to defrost. This can accelerate the defrosting efficiency of the freezing evaporator 3, while minimizing the heat loss of the defrosting heater 4 to the freezer compartment, reducing the temperature rise of the freezer compartment, improving the heat utilization rate of the defrosting heater 4, and reducing the energy consumption of the defrosting heater 4.

[0180] It is understood that when the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the second preset temperature, the defrosting heater 4 is not limited to periodically heating the evaporator 3. For example, when the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the second preset temperature, the defrosting heater 4 is controlled to shut down.

[0181] In some embodiments, please refer to Figure 1 , Figure 2 and Figure 4 The refrigeration temperature measuring device 16 is connected between the output end of the refrigeration evaporator 3 and the input end of the compressor 1, and the refrigeration temperature measuring device 16 is connected in series with the refrigeration evaporator 2; or, the refrigeration temperature measuring device 16 is connected between the output end of the refrigeration evaporator 3 and the input end of the compressor 1, and the refrigeration temperature measuring device 16 is connected in parallel with the refrigeration evaporator 2.

[0182] It should be noted that when the refrigeration evaporator 2 and the freezing evaporator 3 are connected in series, the freezing temperature measuring device 16 is connected between the output end of the freezing evaporator 3 and the input end of the compressor 1, and the freezing temperature measuring device 16 is connected in series with the refrigeration evaporator 2; when the refrigeration evaporator 2 and the freezing evaporator 3 are connected in parallel, the freezing temperature measuring device 16 is connected between the output end of the freezing evaporator 3 and the input end of the compressor 1, and the freezing temperature measuring device 16 is connected in parallel with the refrigeration evaporator 2.

[0183] In this embodiment of the application, by arranging the refrigeration temperature measuring device 16 in a suitable position, the refrigeration temperature measuring device 16 can measure the temperature of the refrigerant discharged from the refrigeration evaporator 3.

[0184] It is understood that the freezing temperature measuring device 16 is connected in parallel with the refrigeration evaporator 2. Exemplarily, when the freezing evaporator 3 is connected in parallel with the refrigeration evaporator 2, the freezing temperature measuring device 16 is connected in series with the freezing evaporator 3.

[0185] In some embodiments, the compressor 1 rotates at a speed greater than ...

[0186] In this embodiment, during the defrosting step, the temperature of the evaporator 3 is low, and there is a lot of frost on the evaporator 3, requiring more heat from the refrigerant and necessitating the compressor 1 to operate at a higher speed. During the periodic defrosting step, the temperature of the refrigerant discharged from the evaporator 3, as measured by the temperature measuring device 16, is greater than or equal to a second preset temperature. Some of the frost on the evaporator 3 has melted, and the temperature of the evaporator 3 is relatively higher than during the defrosting step. This requires less heat from the refrigerant, allowing for a reduction in the compressor 1's speed and thus lowering its energy consumption.

[0187] It is understood that the rotational speed of compressor 1 during the defrosting process is not limited to being greater than the rotational speed of compressor 1 during the periodic defrosting process. For example, the rotational speed of compressor 1 during the defrosting process is equal to the rotational speed of compressor 1 during the periodic defrosting process.

[0188] In some embodiments, the second preset temperature is -3℃ to 0℃.

[0189] For example, the second preset temperature is -3℃, -2℃, -1℃ or 0℃.

[0190] In this embodiment, the second preset temperature is set in the range of -3℃ to 0℃. If the temperature measured by the freezing temperature measuring device 16 is greater than or equal to the second preset temperature, it can be determined that the defrosting of the three parts of the freezing evaporator is complete.

[0191] It is understood that the second preset temperature is not limited to -3℃ to 0℃. For example, the second preset temperature is less than -3℃, or the second preset temperature is greater than 0℃.

[0192] In some embodiments, please refer to Figure 6 and Figure 7 The control methods also include:

[0193] Step S8: If the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the third preset temperature, turn off the compressor 1 and the defrost heater 4.

[0194] Step S9: After shutting down compressor 1, control the first switching valve 6 to connect the output end of compressor 1 with the main refrigeration circuit 8 so that the working mode of the refrigeration system is switched from defrosting mode to refrigeration mode.

[0195] The input end of the main cooling path 8 is connected to the corresponding first outlet 62. The condenser 10 is connected in series with the main cooling path 8. The main cooling path 8 is connected in series with the refrigeration evaporator 2 and the freezing evaporator 3 respectively.

[0196] In this embodiment, when the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the third preset temperature, the defrosting of the evaporator 3 is basically completed, and the compressor 1 and defrost heater 4 are turned off. After the compressor 1 is turned off, the first switching valve 6 connects the first inlet 61 to the first outlet 62 corresponding to the main refrigeration path 8, and the refrigerant output by the compressor 1 enters the main refrigeration path 8. The refrigeration system switches from defrosting mode to refrigeration mode. The operating mode of the refrigeration system is switched off after the compressor 1 is turned off, reducing the impact of the switching on the pipeline.

[0197] It is understood that the compressor 1 and defrost heater 4 are not turned off only when the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to a third preset temperature. For example, the compressor 1 and defrost heater 4 are turned off after the defrost heater 4 has been heating for a preset time.

[0198] In some embodiments, the third preset temperature is 0°C to 8°C.

[0199] For example, the third preset temperature is 0°C, 2°C, 6°C or 8°C.

[0200] It should be noted that the third preset temperature was determined based on experiments.

[0201] In this embodiment, the third preset temperature is set in the range of 0℃ to 8℃. If the temperature measured by the freezing temperature measuring device 16 is greater than or equal to the third preset temperature, it can be determined that the defrosting of the freezing evaporator 3 is basically completed, and the compressor 1 and the defrosting heater 4 can be turned off.

[0202] It is understood that the third preset temperature is not limited to 0℃ to 8℃. For example, the third preset temperature is less than 0℃, or the third preset temperature is greater than 8℃.

[0203] In some embodiments, the control method further includes:

[0204] In response to the refrigeration command, the second switching valve 7 is controlled to connect the main refrigeration path 8 with the first refrigeration branch 81 so that the refrigeration evaporator 2 can be refrigerated.

[0205] The first refrigeration branch 81 is connected between the corresponding second outlet 72 of the second switching valve 7 and the input end of the refrigeration evaporator 2, and the first refrigeration branch 81 is connected in series with a throttle 12.

[0206] In response to the refrigeration command, the second switching valve 7 is controlled to connect the main refrigeration path 8 with the second refrigeration branch 82 so that the refrigeration evaporator 3 can be refrigerated.

[0207] One end of the second refrigeration branch 82 is connected to the corresponding second outlet 72 of the second switching valve 7, and the other end of the second refrigeration branch 82 is connected to the first exhaust defrosting pipe 51. The second refrigeration branch 82 is connected in series with a throttle 12, and at least two second outlets 72 are used to selectively connect to the second inlet 71.

[0208] In this embodiment, when refrigeration is required, the second switching valve 7 is controlled to connect the main refrigeration path 8 to the first refrigeration branch 81 to enable the refrigeration evaporator 2 to refrigerate. When freezing is required, the second switching valve 7 is controlled to connect the main refrigeration path 8 to the second refrigeration branch 82 to enable the freezing evaporator 3 to refrigerate. The refrigeration is performed according to the demand, either freezing or refrigeration.

[0209] It is understood that the other end of the second refrigeration branch 82 is not limited to being connected to the first exhaust defrosting pipe 51. For example, a connecting pipe 18 is provided between the refrigeration evaporator 2 and the freezing evaporator 3, and the other end of the second refrigeration branch 82 is connected to the connecting pipe 18.

[0210] In some embodiments, the control method includes: in defrosting mode, controlling the first switching valve 6 to connect the output end of the compressor 1 and the first exhaust defrosting pipe 51 so that the refrigerant output by the compressor 1 flows through the refrigeration evaporator 3; controlling the auxiliary heater 14 to heat the water receiving device to melt the frost that falls into the water receiving device during the defrosting process of the refrigeration evaporator 2; and starting the refrigeration fan 17 so that the airflow in the refrigeration compartment flows to the refrigeration evaporator 2.

[0211] In some embodiments, the control method includes: turning off the auxiliary heater 14 and turning off the refrigeration fan 17 when the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to a first preset temperature.

[0212] In some embodiments, when the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to a fourth preset temperature, the refrigeration fan 17 is turned off and the defrosting heater 4 is turned on in defrosting mode.

[0213] For example, the fourth preset temperature is -18°C, -19°C, -19.9°C or -20°C.

[0214] It should be noted that the fourth preset temperature is less than or equal to the temperature of the freezer compartment.

[0215] It should be noted that the fourth preset temperature is the temperature of the refrigerant measured by the refrigeration temperature measuring device 16, provided that the temperature of the refrigerant discharged from the evaporator 3 is equal to the temperature of the freezer compartment. The fourth preset temperature was determined experimentally.

[0216] In this embodiment, when the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the fourth preset temperature, the temperature of the refrigeration evaporator 3 is close to the temperature of the refrigeration chamber, and the airflow in the refrigeration chamber has a small effect on the heating of the refrigeration evaporator 3, the refrigeration fan 17 can be turned off.

[0217] In some embodiments, please refer to Figure 1The refrigeration system consists of a refrigeration evaporator 2 and a freezing evaporator 3 connected in parallel. The control method for the refrigeration system includes: switching the refrigeration system to defrost mode; connecting the first inlet 61 to the first outlet 62 corresponding to the second exhaust defrost pipe 52 via the first switching valve 6; operating the compressor 1 at high speed; and the high-temperature refrigerant output by the compressor 1 flowing into the second exhaust defrost pipe 52 and through the refrigeration evaporator 2 to defrost it; turning on the auxiliary heater 14 to heat the water supply device to melt the frost that falls off the refrigeration evaporator 2 during defrosting; starting the refrigeration fan 17 to direct airflow into the freezing room towards the freezing evaporator 3 for initial heating; turning off the refrigeration fan 17 when the temperature of the refrigerant discharged from the freezing evaporator 3, as measured by the refrigeration temperature measuring device 16, is greater than or equal to a fourth preset temperature; and turning on the defrost heater 4 to continue heating the freezing evaporator 3; and turning off the auxiliary heater 14 when the temperature of the refrigerant discharged from the refrigeration evaporator 2, as measured by the refrigeration temperature measuring device 15, is greater than or equal to the first preset temperature, thus completing the defrosting of the refrigeration evaporator 2. When the temperature of the refrigerant discharged from the refrigeration evaporator 2, as measured by the refrigeration temperature measuring device 15, is greater than or equal to the first preset temperature, the first switching valve 6 connects the first inlet 61 to the first outlet 62 corresponding to the first exhaust defrosting pipe 51. The compressor 1 operates at a reduced speed, and the high-temperature refrigerant output by the compressor 1 flows into the first exhaust defrosting pipe 51 and through the refrigeration evaporator 3 to defrost it. When the temperature of the refrigerant discharged from the refrigeration evaporator 3, as measured by the refrigeration temperature measuring device 16, is greater than or equal to the second preset temperature, the refrigeration evaporator 3 is partially defrosted. The compressor 1 operates at a reduced speed, the defrosting heater 4 stops heating for a third preset time, and then the defrosting heater 4 restarts heating for a second preset time. The defrosting heater 4 periodically heats the refrigeration evaporator 3 to defrost it. When the temperature of the refrigerant discharged from the refrigeration evaporator 3, as measured by the refrigeration temperature measuring device 16, is greater than or equal to the third preset temperature, the refrigeration evaporator 3 is defrosted. The compressor 1 is turned off, the defrosting heater 4 is turned off, and the first switching valve 6 connects the first inlet 61 to the first outlet 62 corresponding to the main refrigeration path 8.

[0218] In some embodiments, please refer to Figure 4The refrigeration system consists of a refrigerated evaporator 2 and a frozen evaporator 3 connected in series. The control method includes: a first switching valve 6 connecting the first inlet 61 to the first outlet 62 corresponding to the first exhaust defrosting pipe 51; the compressor 1 running at high speed; and the high-temperature refrigerant output by the compressor 1 flowing into the first exhaust defrosting pipe 51 and through the frozen evaporator 3 to defrost it; and the defrosting heater 4 being turned on to heat the frozen evaporator 3. An auxiliary heater 14 is turned on to heat the water supply device to melt the frost that falls off the refrigerated evaporator 2 during defrosting; and the refrigeration fan 17 is turned on to direct airflow from the refrigerated compartment to the refrigerated evaporator 2, raising its temperature. When the temperature of the refrigerant discharged from the frozen evaporator 3, as measured by the refrigeration temperature measuring device 16, is greater than or equal to a second preset temperature, the compressor 1 reduces its speed, the defrosting heater 4 stops heating for a third preset time, and then the defrosting heater 4 restarts heating for the second preset time. The defrosting heater 4 periodically heats the frozen evaporator 3 to continue defrosting it. When the temperature of the refrigerant discharged from the refrigeration evaporator 2, as measured by the refrigeration temperature measuring device 15, is greater than or equal to the first preset temperature, the auxiliary heater 14 and the refrigeration fan 17 are turned off, and the defrosting of the refrigeration evaporator 2 is completed. When the temperature of the refrigerant discharged from the refrigeration evaporator 3, as measured by the freezing temperature measuring device 16, is greater than or equal to the third preset temperature, the defrosting heater 4 and the compressor 1 are turned off, and the defrosting of the refrigeration evaporator 3 is completed. The first switching valve 6 connects the first inlet 61 to the first outlet 62 corresponding to the main refrigeration path 8.

[0219] In some embodiments, please refer to Figure 1 and Figure 8 The control method of the refrigeration system will be explained in detail:

[0220] Step S100: The refrigeration system switches to defrost mode.

[0221] Step S101: The first switching valve 6 connects the first outlet 62 corresponding to the second exhaust defrosting pipe 52 with the first inlet 61.

[0222] Step S102: Turn on the auxiliary heater 14 and the compressor 1 runs in R1 mode.

[0223] Step S103: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature.

[0224] If yes, proceed to step S107; otherwise, proceed to step S102.

[0225] Step S104: Turn on the refrigeration fan 17.

[0226] Step S105: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the fourth preset temperature.

[0227] If yes, proceed to step S106; otherwise, proceed to step S104.

[0228] Step S106: Turn off the refrigeration fan 17 and turn on the defrosting heater 4.

[0229] Step S107: The auxiliary heater 14 is turned off, the refrigerator evaporator 2 is defrosted, the first switching valve 6 connects the first outlet 62 corresponding to the first exhaust defrost pipe 51 with the first inlet 61, and the compressor 1 runs in R2 mode.

[0230] Step S108: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the second preset temperature.

[0231] If yes, proceed to step S109; otherwise, proceed to step S107.

[0232] Step S109: Compressor 1 runs at R3 setting, and defrost heater 4 stops heating for the third preset time.

[0233] Step S110: Defrosting heater 4 heats for the second preset time.

[0234] Step S111: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the third preset temperature.

[0235] If yes, proceed to step S112; otherwise, proceed to step S109.

[0236] Step S112: Turn off the defrost heater 4 and compressor 1. The defrosting of the freezer evaporator 3 is complete.

[0237] Step S113: The first switching valve 6 connects the first outlet 62 and the first inlet 61 corresponding to the main cooling path 8.

[0238] Step S114: The refrigeration system exits defrosting mode.

[0239] For example, the compressor 1 has a speed R1 setting that is greater than R2 setting, and R2 setting that is greater than R3 setting.

[0240] In some embodiments, please refer to Figure 4 and Figure 9 The control method of the refrigeration system will be explained in detail:

[0241] Step S200: The refrigeration system switches to defrost mode.

[0242] Step S201: The first switching valve 6 connects the first outlet 62 corresponding to the first exhaust defrosting pipe 51 with the first inlet 61.

[0243] Step S202: Turn on the defrost heater 4 and the compressor 1 runs at R4.

[0244] Step S203: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the second preset temperature.

[0245] If yes, proceed to step S207; otherwise, proceed to step S202.

[0246] Step S204: Turn on the refrigeration fan 17 and auxiliary heater 14.

[0247] Step S205: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 15 is greater than or equal to the first preset temperature.

[0248] If yes, proceed to step S206; otherwise, proceed to step S204.

[0249] Step S206: Turn off the auxiliary heater 14 and the refrigeration fan 17. The defrosting of the refrigeration evaporator 2 is complete.

[0250] Step S207: Compressor 1 runs at R5 setting, and defrost heater 4 stops heating for the third preset time.

[0251] Step S208: Defrosting heater 4 heats for the second preset time.

[0252] Step S209: Determine whether the temperature of the refrigerant measured by the refrigeration temperature measuring device 16 is greater than or equal to the third preset temperature.

[0253] If yes, proceed to step S210; otherwise, proceed to step S207.

[0254] Step S210: Turn off the defrost heater 4 and compressor 1. Defrosting of the freezer evaporator 3 is complete.

[0255] Step S211: The first switching valve 6 connects the first outlet 62 and the first inlet 61 corresponding to the main cooling path 8.

[0256] Step S212: The refrigeration system exits defrosting mode.

[0257] For example, the speed of compressor 1 at R4 is greater than that at R5.

[0258] In some embodiments, the refrigeration system includes a compressor 1, a first switching valve 6, a main refrigeration path 8, a refrigeration evaporator 2, a freezing evaporator 3, a defrost heater 4, at least one exhaust defrost pipe, a memory, and a processor;

[0259] The first switching valve 6 has a first inlet 61 and at least two first outlets 62. The first switching valve 6 is used to connect one of the at least two first outlets 62 to the first inlet 61. The first inlet 61 is connected to the output end of the compressor 1, and the input end of the refrigeration main flow path 8 is connected to one of the first outlets 62.

[0260] The refrigerant in the main refrigeration path 8 flows back to the compressor 1 via the refrigeration evaporator 2 and / or the freezing evaporator 3;

[0261] The defrosting heater 4 is used to heat the refrigeration evaporator 3. Each exhaust defrosting pipe is connected to the corresponding first outlet 62. The refrigerant in at least one exhaust defrosting pipe flows back to the compressor 1 through the refrigeration evaporator 3.

[0262] The memory stores a computer program, and the processor executes the computer program to implement the steps of the above control method.

[0263] In the description of this application, the terms "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine different embodiments or examples described in this application, as well as features of different embodiments or examples.

[0264] The above are merely preferred embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A control method of a refrigeration system, characterized by, The refrigeration system includes a compressor, a first switching valve, a refrigeration main flow path, a refrigeration evaporator, a freezing evaporator, a defrosting heater, and at least one exhaust defrosting pipe; the first switching valve has a first inlet and at least two first outlets, the first switching valve is used to connect one of the at least two first outlets to the first inlet, the first inlet is connected to the output end of the compressor, and the input end of the refrigeration main flow path is connected to one of the first outlets; The refrigerant in the main refrigeration path flows back to the compressor via the refrigeration evaporator and / or the freezing evaporator; The defrosting heater is used to heat the refrigeration evaporator. Each of the exhaust defrosting pipes is connected to the corresponding first outlet. The refrigerant in at least one of the exhaust defrosting pipes flows back to the compressor via the refrigeration evaporator. The refrigeration system has two operating modes: a refrigeration mode and a defrosting mode. The defrosting mode includes a preset defrosting mode. The control method includes: Assisted defrosting: In the preset defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the corresponding exhaust defrosting pipe so that the refrigerant output by the compressor flows through the refrigeration evaporator via the corresponding exhaust defrosting pipe and returns to the compressor. The output end of the compressor is connected to the first inlet of the first switching valve, and the exhaust defrosting pipe is connected to the corresponding first outlet of the first switching valve. At least two of the first outlets are used to selectively connect to the first inlet. Heating defrost: During the process of the refrigerant output from the compressor flowing through the refrigeration evaporator via the corresponding exhaust defrost pipe, the defrost heater is controlled to heat the refrigeration evaporator.

2. The control method according to claim 1, characterized by One of the exhaust defrosting pipes is a first exhaust defrosting pipe, which is connected in series between the first outlet of the first switching valve and the input end of the freeze evaporator. The steps for assisting defrosting include: Defrosting: In the preset defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the first exhaust defrosting pipe so that the refrigerant output by the compressor flows through the refrigeration evaporator.

3. The control method according to claim 2, characterized by, One of the defrosting pipes is a second defrosting pipe, which is connected in series between the first outlet of the first switching valve and the input of the refrigeration evaporator. The refrigeration evaporator is connected in series between the output of the refrigeration evaporator and the input of the compressor. Before the defrosting step, the auxiliary defrosting step further includes: Common defrosting: In the preset defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the second exhaust defrosting pipe so that the refrigerant output by the compressor flows sequentially through the refrigeration evaporator and the freezing evaporator.

4. The control method according to claim 3, characterized by, The compressor rotates at a higher speed during the common defrosting step than during the freeze defrosting step.

5. The control method according to claim 2, characterized in that, One of the exhaust defrosting pipes is a second exhaust defrosting pipe, which is connected in series between the first outlet of the first switching valve and the input end of the refrigeration evaporator. The refrigeration evaporator and the freezing evaporator are connected in parallel, and the refrigeration evaporator and the freezing evaporator are connected in series with the compressor, respectively. Prior to the defrosting step, the control method further includes: Refrigeration defrosting: In the defrosting mode, the first switching valve is controlled to connect the output end of the compressor and the second exhaust defrosting pipe so that the refrigerant output by the compressor flows back to the compressor via the refrigeration evaporator.

6. The control method according to claim 5, characterized in that, The compressor rotates at a higher speed in the refrigerated defrosting step than it does in the frozen defrosting step.

7. The control method according to claim 5, characterized in that, The control method further includes: During the defrosting process, the refrigeration fan is activated to direct airflow from the freezer compartment to the refrigeration evaporator.

8. The control method according to claim 7, characterized in that, The control method further includes: When the difference between the temperature of the freezer compartment and the temperature of the refrigerant measured by the freezer temperature measuring device is less than or equal to a first preset value, the freezer fan is turned off and the defrost heater is turned on in the defrost mode. The freezer temperature measuring device is connected to the output end of the freezer evaporator and is connected in parallel with the refrigeration evaporator.

9. The control method according to any one of claims 2 to 8, characterized in that, The condition for performing the defrosting step is that the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the first preset temperature. The refrigeration temperature measuring device is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator.

10. The control method according to any one of claims 3 to 8, characterized in that, The control method further includes: During the process of the refrigerant output from the compressor flowing through the second exhaust defrosting pipe into the refrigeration evaporator, the auxiliary heater is controlled to heat the water receiving device to melt the frost that falls into the water receiving device during the defrosting process of the refrigeration evaporator.

11. The control method according to claim 10, characterized in that, The control method further includes: If the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the first preset temperature, the auxiliary heater is turned off. The refrigeration temperature measuring device is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator.

12. The control method according to any one of claims 2 to 8, characterized in that, The defrosting step includes: Periodic defrosting: When the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the second preset temperature, the defrosting heater is controlled to periodically heat the refrigeration evaporator as the refrigerant output from the compressor flows through the corresponding exhaust defrosting pipe. The total duration of one heating cycle of the defrosting heater is a first preset duration. The defrosting heater heats for a second preset duration within one heating cycle, and stops heating for a third preset duration within one heating cycle. The first preset duration is equal to the sum of the second preset duration and the third preset duration. The refrigeration temperature measuring device is used to measure the temperature of the refrigerant discharged from the refrigeration evaporator.

13. The control method according to claim 12, characterized in that, The compressor rotates at a higher speed during the defrosting step than during the periodic defrosting step.

14. The control method according to claim 12, characterized in that, The control method further includes: If the temperature of the refrigerant measured by the refrigeration temperature measuring device is greater than or equal to the third preset temperature, the compressor and the defrost heater shall be turned off. After the compressor is turned off, the first switching valve is controlled to connect the output end of the compressor and the main refrigeration path so that the working mode of the refrigeration system is switched from the defrosting mode to the refrigeration mode. The input end of the main refrigeration path is connected to the corresponding first outlet. The condenser is connected in series on the main refrigeration path. The main refrigeration path is connected in series with the refrigeration evaporator and the freezing evaporator respectively.

15. A refrigeration system, characterized in that, The system includes a compressor, a first switching valve, a refrigeration main flow path, a refrigeration evaporator, a freezing evaporator, a defrost heater, at least one exhaust defrost pipe, a memory, and a processor. The first switching valve has a first inlet and at least two first outlets. The first switching valve is used to selectively connect one of the at least two first outlets to the first inlet. The first inlet is connected to the output end of the compressor, and the input end of the refrigeration main flow path is connected to one of the first outlets. The refrigerant in the main refrigeration path flows back to the compressor via the refrigeration evaporator and / or the freezing evaporator; The defrosting heater is used to heat the refrigeration evaporator. Each of the exhaust defrosting pipes is connected to the corresponding first outlet. The refrigerant in at least one of the exhaust defrosting pipes flows back to the compressor via the refrigeration evaporator. The memory stores a computer program, and the processor executes the computer program to implement the steps of the control method according to any one of claims 1 to 14.

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