Refrigerating system, refrigerator and control method

Abstract

The invention provides a refrigerating system, a refrigerator and a control method, the refrigerating system comprises a compressor, a reversing valve, a freezing evaporator and a condenser, a first branch is arranged between the condenser and the freezing evaporator, and a refrigeration evaporator and a first throttling device are arranged on the first branch; in the countercurrent defrosting working condition, after being subjected to condensation heat dissipation in the freezing evaporator, a refrigerant sequentially passes through a first throttling device in the first branch and the refrigeration evaporator to enter the condenser, and the refrigeration evaporator is used for carrying out evaporation refrigeration on the refrigerant entering the refrigeration evaporator; and the refrigerant absorbs heat in the condenser and then returns to the compressor through the reversing valve. In the defrosting process of the freezing evaporator, cold energy generated by defrosting can be carried to the refrigeration evaporator by the refrigerant flowing through the freezing evaporator, and cold energy recycling and reusing are achieved. Therefore, cooperative operation of defrosting and fresh-keeping of the refrigerating chamber and efficient utilization of energy are achieved, and the energy-saving performance and the fresh-keeping performance are both considered.

Description

Technical Field

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

[0002] Current refrigerators use electric heating wires to heat the evaporator for defrosting. This method is energy-intensive, and the refrigeration circuit needs to be cut off during defrosting. Therefore, the temperature in the refrigerator compartment can rise continuously during the defrosting process, reducing the food preservation effect. Summary of the Invention

[0003] This application provides a refrigeration system, a refrigerator, and a control method that can achieve the goal of both defrosting the refrigerator and preventing the temperature in the refrigerator compartment from rising.

[0004] In a first aspect, embodiments of this application provide a refrigeration system, including: a compressor, a reversing valve, a refrigeration evaporator, and a condenser, wherein a first end of the reversing valve is connected to the exhaust port of the compressor, a second end and a third end of the reversing valve are respectively connected to the refrigeration evaporator and the condenser, and a fourth end of the reversing valve is connected to the suction port of the compressor; a first branch is provided between the condenser and the refrigeration evaporator, and a refrigeration evaporator and a first throttling device are provided on the first branch; In counter-current defrosting mode, the reversing valve is configured to switch the refrigerant output from the compressor's exhaust port to the refrigeration evaporator; In the counter-current defrosting condition, after the refrigerant is condensed and dissipated in the refrigeration evaporator, it sequentially passes through the first throttling device in the first branch and the refrigeration evaporator into the condenser. The refrigeration evaporator is used to evaporate and cool the refrigerant entering the refrigeration evaporator. After absorbing heat in the condenser, the refrigerant returns to the compressor through the reversing valve.

[0005] In one possible implementation of the first aspect, a first branch path is provided between the refrigerated evaporator and the condenser; In the counter-current defrosting condition, the refrigerant flowing out from the refrigeration evaporator passes through the first throttling device and the refrigeration evaporator, and then enters the condenser through the first branch. The first throttling device is configured to create a first throttling degree on the refrigerant, and the first air supply device of the refrigeration evaporator is configured to be in the open state to cool the refrigerator compartment.

[0006] In one possible implementation of the first aspect, a second branch is provided between the refrigeration evaporator and the condenser, and a refrigeration throttling device is provided on the second branch; In the counter-current defrosting condition and when the ambient temperature is lower than the preset temperature, the refrigerant flowing out from the refrigeration evaporator passes through the first throttling device and the refrigeration evaporator, and then enters the condenser through the second branch. The first throttling device is configured to create a second throttling degree on the refrigerant, and the first air supply device of the refrigeration evaporator is configured to be in a closed state.

[0007] In one possible implementation of the first aspect, the refrigeration system further includes: The control valve includes a common interface, a first interface, a second interface, and a third interface, wherein the common interface is connected to one end of the condenser; The second branch is located between the third interface and the refrigeration evaporator, and a refrigeration throttling device is provided on the second branch. The first branch includes a first branch line disposed between the first interface and the refrigeration evaporator, and a second branch line disposed between the second interface and the refrigeration evaporator, wherein a refrigeration throttling device is disposed on the second branch line.

[0008] Secondly, embodiments of this application provide a refrigerator, including: a refrigeration system as described in the first aspect, and a controller, a refrigerator compartment, a freezer compartment, a first air supply device located at the refrigerator evaporator, and a second air supply device located at the condenser; The controller is configured to: When the refrigerator is in the counter-flow defrosting mode, the compressor and the reversing valve are controlled to make the refrigerant flow in the reverse direction to the freezer evaporator; The control valve is used to open the passage between the common interface and the first interface, and to close the passage between the common interface and the second interface and the third interface, respectively. Adjust the first throttling device to form a first throttling degree on the refrigerant, control the first air supply device to be in the open state, and control the second air supply device to be in the closed state.

[0009] In one possible implementation of the second aspect, the controller is further configured to: When the refrigerator is in the counter-flow defrosting mode, the current ambient temperature is obtained; When the ambient temperature is lower than the preset temperature, the compressor and the reversing valve are controlled to reverse the flow of the refrigerant. The control valve is controlled to open the passage between the common interface and the second interface, and to close the passage between the common interface and the first interface and the third interface respectively. The first throttling device is adjusted to form a second throttling degree on the refrigerant. The first air supply device is controlled to be in a closed state, and the second air supply device is controlled to be in a closed state. The second throttling degree is less than the first throttling degree.

[0010] In one possible implementation of the second aspect, the controller is specifically configured as follows: Obtain a reference table, which reflects the correspondence between different ambient temperatures and the degree of throttling of the refrigerant by the first throttling device, and the ambient temperature is positively correlated with the degree of throttling of the first throttling device; Based on the reference table and the current ambient temperature, determine the target throttling degree of the first throttling device; The compressor and the reversing valve are controlled to make the refrigerant flow in reverse. The control valve is controlled to open the passage between the common interface and the second interface, and to close the passage between the common interface and the first interface and the third interface respectively. The first throttling device is adjusted to the target throttling degree of the refrigerant. The first air supply device is controlled to be in the off state, and the second air supply device is controlled to be in the on state.

[0011] In one possible implementation of the second aspect, the controller is specifically configured as follows: The compressor is started, and the reversing valve is controlled to open the passage between the first end and the third end, as well as the passage between the fourth end and the second end, so that the refrigerant flows in reverse.

[0012] In one possible implementation of the second aspect, the refrigerator further includes a third air supply device disposed at the freezer evaporator, and the controller is further configured to: In refrigeration operation, the compressor and the reversing valve are controlled to make the refrigerant flow in the forward direction. The control valve is controlled to open the passage between the common interface and the second interface, and to close the passage between the common interface and the first interface and the third interface respectively. The first throttling device is adjusted to form a second throttling degree on the refrigerant. The first air supply device is controlled to be in the open state, the third air supply device is controlled to be in the closed state, and the second air supply device is controlled to be in the open state; the second throttling degree is less than the first throttling degree. In refrigeration mode, the compressor and the reversing valve are controlled to make the refrigerant flow in the forward direction, the control valve is controlled to open the passage between the common interface and the third interface, and the passage between the common interface and the first interface and the second interface are closed respectively. The first throttling device is adjusted to form the second throttling degree of the refrigerant, the first air supply device is controlled to be in the off state, the third air supply device is controlled to be in the on state, and the second air supply device is controlled to be in the on state. When refrigeration and freezing are operating simultaneously, the compressor and the reversing valve are controlled to make the refrigerant flow in the forward direction. The control valve is controlled to open the passage between the common interface and the second interface and the passage between the common interface and the third interface, respectively, and to close the passage between the common interface and the first interface. The first throttling device is adjusted to form a third throttling degree on the refrigerant. The first air supply device is controlled to be in the open state, the third air supply device is controlled to be in the open state, and the second air supply device is controlled to be in the open state.

[0013] Thirdly, embodiments of this application provide a method for controlling a refrigerator, wherein the refrigerator is used to perform actions performed by a controller in a refrigerator as described in any of the second aspects.

[0014] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the third aspect.

[0015] Fifthly, embodiments of this application provide a computer program product that, when run on a refrigerator, causes the refrigerator to perform the method described in the third aspect above.

[0016] It is understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here.

[0017] The beneficial effects of this embodiment compared with the prior art are as follows: In the counter-current defrosting condition, the refrigeration system of this embodiment uses the reversal of the refrigerant flow to enable the evaporator to release heat from the refrigerant to achieve defrosting. At the same time, the refrigerant can flow into the refrigeration evaporator in a low temperature and low pressure state through the throttling effect of the first throttling device to cool the refrigerator compartment. Furthermore, the cold energy generated by the melting of frost during the defrosting process of the evaporator can be carried to the refrigeration evaporator by the flowing refrigerant, realizing the recovery and reuse of cold energy. Therefore, this embodiment uses cold energy recovery to allow the refrigerant to simultaneously meet the cooling needs of the refrigerator evaporator while completing the heat exchange related to defrosting. This not only improves energy utilization efficiency and shortens the energy conversion time during defrosting, but also avoids the extra energy consumption of restarting the refrigeration system to cool the refrigerator compartment after defrosting. Structurally, it breaks the functional conflict between traditional defrosting and refrigerator compartment preservation, allowing the refrigerator compartment to continuously receive cold energy replenishment during defrosting. This reduces power consumption and avoids the problem of reduced food preservation effect caused by increased refrigerator compartment temperature. It achieves coordinated operation and efficient energy utilization of defrosting and refrigerator compartment preservation, taking into account both energy saving and preservation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a refrigeration system provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a refrigerator provided in one embodiment of this application; Figure 3 This is a schematic diagram of the refrigerant circulation in a counter-current defrosting condition of a refrigeration system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the refrigerant circulation in a refrigeration system provided in an embodiment of this application under the condition that the ambient temperature is lower than the preset temperature and the system is in a counter-current defrosting state. Figure 5 This is a schematic diagram of the circulation of refrigerant in a refrigeration system provided in an embodiment of this application under refrigeration conditions; Figure 6 This is a schematic diagram of the refrigerant circulation in a refrigeration system under refrigeration conditions according to an embodiment of this application; Figure 7 This is a schematic diagram of the refrigerant circulation in a refrigeration system provided in an embodiment of this application under refrigeration and freezing conditions.

[0020] Figure label: 10-Compressor, 11-Discharge port, 12-Inlet port, 20-Reversing valve, 21-First end, 22-Second end, 23-Third end, 24-Fourth end, 30-Condenser, 40-Control valve, 41-Common interface, 42-First interface, 43-Second interface, 44-Third interface, 50-First branch, 51-First sub-branch, 52-Refrigeration evaporator, 53-First throttling device, 60-Second sub-branch, 61-Refrigeration throttling device, 70-Second branch, 71-Refrigeration throttling device, 80-Refrigeration evaporator, 91-Refrigeration compartment, 92-Freezer compartment. Detailed Implementation

[0021] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0022] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0023] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0024] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0025] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0027] In current refrigerator refrigeration systems, there is a functional conflict between defrosting and cooling. This is specifically manifested in the following aspects: (1) Traditional refrigerators generally use electric heating wires to defrost the evaporator. This method requires a large amount of extra electricity to generate heat to melt the frost, which not only increases the overall energy consumption of the refrigerator, but also has the problem of low heat utilization efficiency. The heat generated by heating is used for defrosting and is not recycled, which goes against the current trend of energy saving and consumption reduction, making it difficult to improve the overall energy efficiency rating of the refrigerator. In addition, during the electric defrosting process, the refrigeration system needs to stop supplying cooling to the refrigerator compartment. During this period, the refrigerator compartment cannot receive additional cooling, and the ambient temperature will continue to rise, which will damage the preservation environment of food (especially fruits, vegetables, and fresh food), causing the food to lose moisture and deteriorate faster, seriously affecting the preservation performance of the refrigerator and failing to meet users' demand for long-lasting freshness of food.

[0028] (2) Some existing counter-current defrosting solutions are designed only for a single refrigeration evaporator, with a piping layout of "condenser-single evaporator" in a unidirectional cycle, without taking into account the structural characteristics of dual-system refrigerators with both refrigeration and freezing evaporators. Such solutions lack independent control branches and flow channel switching mechanisms adapted to dual evaporators (refrigeration evaporator and freezing evaporator), and cannot simultaneously meet the defrosting and cooling needs of dual evaporators, making them difficult to apply to dual-system refrigerators and having poor adaptability.

[0029] In summary, during traditional electric defrosting, the cold energy generated by melting the frost is not recovered and is directly dissipated into the environment, resulting in energy waste. Conventional counter-current defrosting schemes also do not make full use of the cold energy of the frost itself, but only achieve defrosting by refrigerant flowing in the opposite direction, resulting in a long defrosting process, low efficiency, and the need to restart the refrigeration system to cool down the refrigerator compartment after defrosting, further increasing energy consumption.

[0030] Therefore, this application provides a refrigeration system. The system has a first branch between the condenser and the refrigeration evaporator. The first branch is equipped with a refrigeration evaporator and a first throttling device. In the counter-current defrosting condition, after the refrigerant condenses and dissipates heat in the refrigeration evaporator, it enters the condenser through the first throttling device and the refrigeration evaporator in the first branch. The refrigeration evaporator is used to evaporate and cool the refrigerant that enters the refrigeration evaporator. After absorbing heat in the condenser, the refrigerant returns to the compressor through a reversing valve. This allows the cold energy generated by the melting of frost during the defrosting process of the evaporator to be carried to the refrigerator evaporator by the refrigerant flowing through it, achieving cold energy recovery and reuse. This not only improves energy utilization efficiency and shortens the energy conversion time during defrosting, but also avoids the extra energy consumption of restarting the refrigeration system to cool the refrigerator compartment after defrosting. Structurally, it breaks the functional conflict between traditional defrosting and refrigerator compartment preservation, allowing the refrigerator compartment to continuously receive cold energy during the defrosting process. This reduces power consumption and avoids the problem of reduced food preservation effect caused by increased refrigerator compartment temperature. It achieves synergistic operation and efficient energy utilization of defrosting and refrigerator compartment preservation, taking into account both energy saving and preservation.

[0031] Figure 1 A schematic diagram of the structure of a refrigeration system provided in an embodiment of this application is shown. The refrigeration system includes a compressor 10, a reversing valve 20, a condenser 30, and a refrigeration evaporator 80. A first branch 50 is provided between the condenser 30 and the refrigeration evaporator 80, and a refrigeration evaporator 52 and a first throttling device 53 are provided on the first branch 50.

[0032] Specifically, the compressor 10 includes an exhaust port 11 and an intake port 12; the reversing valve 20 includes a first end 21, a second end 22, a third end 23 and a fourth end 24; the first end 21 is connected to the exhaust port 11, the second end 22 is connected to the other end of the condenser 30, the third end 23 is connected to the other end of the refrigeration evaporator 80, and the fourth end 24 is connected to the intake port 12.

[0033] Specifically, the reversing valve 20 can be a four-way reversing valve. The reversing valve 20 controls the refrigerant circulation direction by switching the internal channels on and off. In refrigeration mode, the passages between the first end 21 and the second end 22, and between the fourth end 24 and the third end 23, are opened, allowing the refrigerant to circulate along the forward path: "compressor 10 → condenser 30 → corresponding branch → refrigeration evaporator 80 → compressor 10". In counter-current defrosting mode, the passages between the first end 21 and the third end 23, and between the fourth end 24 and the second end 22, are opened, allowing the refrigerant to circulate along the reverse path: "compressor 10 → refrigeration evaporator 80 → corresponding branch → condenser 30 → compressor 10".

[0034] By cooperating with the compressor 10 and the reversing valve 20, the refrigerant can circulate in the forward direction to adapt to the refrigeration condition; it can also circulate in the reverse direction to adapt to the counter-flow defrosting condition.

[0035] The condenser 30 is configured to release heat using the refrigerant during refrigeration and absorb heat using the refrigerant during counter-current defrosting. Specifically, during refrigeration, the high-temperature, high-pressure refrigerant flowing inside the condenser 30 exchanges heat with the external environment, releasing its own heat and achieving condensation and liquefaction of the refrigerant; during counter-current defrosting, the condenser 30 absorbs heat using the refrigerant, causing the refrigerant to evaporate and absorb heat.

[0036] The evaporator 80 is configured to absorb heat using the refrigerant in cooling mode and release heat using the refrigerant in counter-current defrosting mode. Specifically, in cooling mode, the low-temperature, low-pressure refrigerant inside the evaporator 80 absorbs heat from the freezer compartment and evaporates, thereby lowering the freezer compartment temperature; in counter-current defrosting mode, the refrigerant flow is reversed, and the high-temperature, high-pressure refrigerant flowing inside the evaporator 80 releases heat, acting on the frost layer condensed on its surface to achieve automatic defrosting without the need for additional heating components.

[0037] The refrigeration evaporator 52 is a component used to provide cooling for the refrigerator compartment. When the refrigerant inside the refrigeration evaporator 52 evaporates, it absorbs heat from the refrigerator compartment to lower the temperature inside the refrigerator compartment and maintain the low-temperature environment required for food preservation.

[0038] The first throttling device 53 is a control component that can regulate the flow of refrigerant. Optionally, the first throttling device 53 is a throttling valve. The throttling valve adjusts the flow resistance and flow rate of the refrigerant by changing its opening degree, adapting to the refrigeration and defrosting requirements under different working conditions, so that the pressure and temperature of the refrigerant in the refrigeration system meet the working requirements of the corresponding working conditions.

[0039] For example, when the throttle valve is 100% open, the valve core is fully open, the passage is unobstructed, the throttle valve provides almost no resistance to the refrigerant, and the pressure of the refrigerant hardly decreases. This means that the temperature of the refrigerant remains essentially unchanged after flowing through the throttle valve. A 100% opening of the throttle valve can meet the high flow rate requirements under refrigeration conditions (refrigeration, freezing, or both simultaneously), ensuring the refrigeration efficiency of each evaporator.

[0040] When the throttling valve is open at 10%, the valve core only opens a very small channel, creating strong resistance to the refrigerant and significantly limiting its flow rate. This slows down the refrigerant's flow velocity and reduces its volume as it passes through the valve. A 10% throttling valve allows the high-pressure refrigerant to experience a rapid pressure drop after passing through, accompanied by a simultaneous temperature decrease, resulting in a low-temperature, low-pressure gaseous or gas-liquid mixture. This is suitable for the low-temperature refrigerant required by the refrigeration evaporator 52 in counter-current defrosting conditions.

[0041] The refrigeration system operates as follows: When the system is in refrigeration mode, the refrigerant circulates in a forward direction within the system. The condenser 30 releases heat to condense the refrigerant, and the evaporator 80 absorbs heat to cool the freezer compartment. At this time, the first throttling device 53 can be adjusted to a suitable throttling degree (e.g., 100% opening) according to the refrigeration requirements, ensuring stable cooling by the evaporator 52. When the system is in counter-current defrosting mode, the refrigerant flow reverses. The refrigerant flows out after condensing and dissipating heat in the evaporator 80, and then flows into the evaporator 52 through the first throttling device 53 in the first branch 50. The evaporator 52 absorbs heat from the freezer compartment to achieve cooling. The refrigerant then flows into the condenser 30, absorbs heat within it, and returns to the compressor 10 through the reversing valve 20. During this process, the evaporator 80 releases heat due to the high-temperature, high-pressure refrigerant flowing inside, thus defrosting itself.

[0042] In the counter-current defrosting mode, the refrigeration system of this embodiment uses the reversal of the refrigerant flow to enable the evaporator 80 to release heat from the refrigerant to defrost. At the same time, the refrigerant can flow into the refrigeration evaporator 52 in a low-temperature and low-pressure state through the throttling effect of the first throttling device 53 to cool the refrigerator compartment. The cold energy generated by the melting of frost in the evaporator 80 during the defrosting process can be carried to the refrigeration evaporator 52 by the flowing refrigerant, realizing the recovery and reuse of cold energy. Therefore, this embodiment uses cold energy recovery to allow the refrigerant to simultaneously meet the cooling needs of the refrigeration evaporator 52 while completing the heat exchange related to defrosting. This not only improves energy utilization efficiency and shortens the energy conversion time during defrosting, but also avoids the extra energy consumption of restarting the refrigeration system to cool the refrigerator compartment after defrosting. Structurally, it breaks the functional conflict between traditional defrosting and refrigerator compartment preservation, allowing the refrigerator compartment to continuously receive cold energy replenishment during defrosting. This reduces power consumption and avoids the problem of reduced food preservation effect caused by increased refrigerator compartment temperature. It achieves coordinated operation of defrosting and refrigerator compartment preservation and efficient energy utilization, taking into account both energy saving and preservation.

[0043] As an optional implementation, the refrigeration system further includes a control valve 40 and a second branch 70; the first branch 50 further includes a first branch 51 and a second branch 60. The first branch 51 and the second branch 60 are arranged side by side.

[0044] The control valve 40 includes a common interface 41, a first interface 42, a second interface 43, and a third interface 44. The common interface 41 is connected to one end of the condenser 30. A first branch line 51 is located between the first interface 42 and the refrigeration evaporator 52. A second branch line 60 is located between the second interface 43 and the refrigeration evaporator 52, and a refrigeration throttling device 61 is installed on the second branch line 60. A second branch line 70 is located between the third interface 44 and the freezer evaporator 80, and a freezer throttling device 71 is installed on the second branch line 70.

[0045] Optionally, the control valve 40 is an electrically controlled valve that switches the on / off state of different interfaces according to electrical signals to realize the diversion of refrigerant between different branches.

[0046] The common interface 41 of the control valve 40 is the centralized input or output end of the refrigerant. The first interface 42, the second interface 43, and the third interface 44 are respectively connected to the first branch 51, the second branch 60, and the second branch 70. According to different operating conditions (such as single refrigeration, single freezing, defrosting + refrigeration), the corresponding interface passage can be opened and the other passages can be closed, so that the refrigerant flows correctly through the corresponding branch under each operating condition.

[0047] See Figure 1 In the first branch 50, there is a first branch 51 between the first interface 42 and the refrigerated evaporator 52, and the second branch 60 is connected in parallel with the first branch 51.

[0048] Optionally, the refrigeration throttling device 61 can be a refrigeration capillary tube, used to throttle and reduce the pressure of the refrigerant flowing into the refrigeration evaporator 52, so that the refrigerant reaches the low temperature and low pressure state required for refrigeration.

[0049] Optionally, the refrigeration throttling device 71 can be a refrigeration capillary tube, used to throttle and reduce the pressure of the refrigerant flowing into the refrigeration evaporator 80, so that the refrigerant reaches the low temperature and low pressure state required for refrigeration.

[0050] In this embodiment, by switching between different interfaces using the control valve 40, the refrigerant can be distributed to the corresponding branch, thus allowing for flexible operation in different conditions such as standalone refrigeration, standalone freezing, or refrigeration + freezing, depending on actual needs.

[0051] See Figure 3 In the counter-current defrosting condition, the refrigerant passes from the refrigeration evaporator 80 through the first throttling device 53 and the refrigeration evaporator 52, and then enters the condenser 30 through the first branch 51. The first throttling device 53 is adjusted to form a first throttling degree on the refrigerant, and the first air supply device of the refrigeration evaporator 52 is configured to be turned on to cool the refrigerator compartment.

[0052] Optionally, the first air supply device can be a fan.

[0053] For example, the first throttling device 53 is a throttling valve with an opening degree of 10%. After the refrigerant is throttled by the throttling valve, both its pressure and temperature decrease, thereby providing more cooling capacity to the refrigeration evaporator 52. After the first air supply device of the refrigeration evaporator 52 is turned on, it can cool the refrigeration compartment.

[0054] As an optional implementation, see [link to implementation details]. Figure 4 When the refrigeration system is in counter-current defrosting mode and the ambient temperature is lower than the preset temperature, the refrigerant flowing out from the freezer evaporator 80 passes through the first throttling device 53 and the refrigeration evaporator 52, and then enters the condenser 30 through the second branch 60. The first throttling device 53 is configured to form a second throttling degree on the refrigerant, and the first air supply device of the refrigeration evaporator 52 is configured to be in the off state.

[0055] Specifically, the second throttling degree is less than the first throttling degree. For example, if the first throttling device 53 is a throttle valve, then the second throttling degree corresponds to the second opening degree, the first throttling degree corresponds to the first opening degree, and the second opening degree is greater than the first opening degree. For instance, the second opening degree is 100%, and the first opening degree is 10%.

[0056] In counter-current defrosting mode, when the opening of the throttling valve is less than 100%, it will throttle the refrigerant, thereby reducing the pressure and temperature of the refrigerant entering the refrigerator evaporator 52. When the ambient temperature is high, the temperature difference between the ambient temperature and the preset temperature of the refrigerator compartment is large, and a large heat exchange is required in the refrigerator compartment. Therefore, it is necessary to keep the opening of the first throttling device 53 at a small degree, such as 10%, so as to reduce the pressure and temperature of the refrigerant entering the refrigerator evaporator 52.

[0057] Since the refrigerator compartment needs to be maintained at around 2-5℃ during normal operation, and the temperature of the refrigerant flowing out of the evaporator 80 during defrosting is around 0℃ and around 5℃ after defrosting, if the ambient temperature is lower than the preset temperature (e.g., 5℃), the temperature difference between the ambient temperature and the preset temperature of the refrigerator compartment is small, or even non-existent or negative. In this case, the refrigerator compartment does not require a large heat exchange; the refrigerant flowing out of the evaporator 80 is sufficient to maintain the temperature around 2-5℃. Therefore, it is necessary to maintain a large second opening of the control throttling valve to reduce or even eliminate the throttling effect on the refrigerant, thereby reducing the amount of cold generated by the refrigerant passing through the first throttling device 53. This prevents the refrigerator compartment from becoming too cold during the backflow defrosting process, which could damage fresh fruits and vegetables.

[0058] This embodiment reduces the resistance of the first throttling device 53 to the flow of the refrigerant by setting the first throttling device 53 to the second throttling level. It utilizes the cold energy generated during the defrosting of the evaporator 80 to cool the refrigerator compartment, which not only reduces energy consumption but also reduces the phenomenon of fruits and vegetables in the refrigerator compartment freezing and being damaged at low ambient temperatures.

[0059] Figure 2 A schematic diagram of the structure of a refrigerator disclosed in an embodiment of this application is shown. The refrigerator includes the refrigeration system described in any of the above embodiments, as well as a controller, a refrigerator compartment 91, a freezer compartment 92, a first air supply device located at the refrigerator evaporator 52, and a second air supply device located at the condenser 30; the controller is configured to: When the refrigerator is in reverse defrosting mode, the compressor 10 and the reversing valve 20 are controlled to make the refrigerant flow in reverse, the control valve 40 is controlled to open the passage between the common interface 41 and the first interface 42, close the passage between the common interface 41 and the second interface 43 and the third interface 44 respectively, adjust the first throttling device 53 to form a first throttling degree for the refrigerant, control the first air supply device to be in the open state, and control the second air supply device to be in the closed state.

[0060] Specifically, the first air supply device is installed at the refrigeration evaporator 52 and is controlled by the controller to start and stop. It is turned on when refrigeration is needed to accelerate the air circulation around the refrigeration evaporator 52 and quickly diffuse the cold energy generated by the refrigeration evaporator 52 to the refrigeration compartment, thereby improving the temperature uniformity and refrigeration efficiency of the refrigeration compartment. It is turned off when refrigeration is not needed to avoid ineffective loss of cold energy or excessive refrigeration.

[0061] Optionally, the second air supply device is a cooling fan.

[0062] The second air supply device is installed at the condenser 30 and is controlled by the controller to start and stop. It starts when the condenser 30 needs to dissipate heat to accelerate the heat exchange between the condenser 30 and the external environment, so as to reduce the temperature of the refrigerant; it shuts off when heat dissipation is not required to maintain the internal temperature of the condenser 30.

[0063] Figure 3 The diagram illustrates the circulation state of the refrigerant in a refrigeration system under counter-current defrosting conditions. The specific circulation state of the refrigerant is as follows: (1) After the compressor 10 starts, it compresses the low-pressure refrigerant into a high-temperature and high-pressure state and discharges it from the exhaust port 11 into the first end 21 of the reversing valve 20. As the controller controls the reversing valve 20 to switch the passage, it connects the first end 21 and the third end 23, and the refrigerant flows into the refrigeration evaporator 80 through the third end 23 of the reversing valve 20.

[0064] (2) The high-temperature and high-pressure refrigerant flows in the refrigeration evaporator 80, releasing heat to melt the frost on the surface of the refrigeration evaporator 80 (achieving the defrosting function), and then flows out of the refrigeration evaporator 80, enters the first branch 50 and flows to the first throttling device 53.

[0065] (3) The controller adjusts the first throttling device 53 to the first throttling level. After the refrigerant is throttled and depressurized by the first throttling device 53, it forms a low temperature and low pressure state and flows into the refrigeration evaporator 52 and evaporates and absorbs heat in the refrigeration evaporator 52. The controller turns on the first air supply device and delivers the cold energy generated by the refrigeration evaporator 52 to the refrigeration room, thereby reducing the temperature in the refrigeration room to achieve the refrigeration function.

[0066] (4) The refrigerant that has completed heat absorption flows out from the refrigerated evaporator 52, through the first branch 51 to the first interface 42 of the control valve 40; the controller controls the control valve 40 to open the passage between the first interface 42 and the common interface 41, and the refrigerant flows out of the control valve 40 through the common interface 41 and enters the condenser 30, where the refrigerant absorbs heat and completes evaporation.

[0067] The controller controls the second air supply device of the condenser 30 to be in the off state to maintain the low temperature of the condenser 30. Then the refrigerant flows out of the condenser 30 and enters the second end 22 of the reversing valve 20.

[0068] (5) The controller controls the reversing valve 20 to connect the second end 22 and the fourth end 24. The refrigerant flows into the suction port 12 of the compressor 10 through the fourth end 24, completing a complete counter-flow defrosting-refrigeration coordinated cycle, and then enters the next cycle until defrosting is completed.

[0069] This embodiment ensures that the evaporator 80 releases heat to complete defrosting through the counter-flow of refrigerant, and that the operation of the first air supply device allows the cooling capacity generated by the evaporator 52 to cool the refrigerator compartment. Furthermore, it utilizes the cooling capacity generated during the defrosting process to cool the refrigerator compartment, thus reducing energy consumption. Because the temperature of the refrigerant flowing out of the evaporator 80 is significantly reduced during defrosting, the cooling efficiency of the refrigerator compartment is also improved.

[0070] As an optional implementation, the controller is further configured to: Obtain the current ambient temperature when the refrigerator is in reverse defrosting mode; When the ambient temperature is lower than the preset temperature, the compressor 10 and the reversing valve 20 are controlled to make the refrigerant flow in reverse. The control valve 40 is controlled to open the passage between the common interface 41 and the second interface 43, and close the passage between the common interface 41 and the first interface 42 and the third interface 44 respectively. The first throttling device 53 is adjusted to form a second throttling degree for the refrigerant. The first air supply device is controlled to be in the closed state, and the second air supply device is controlled to be in the open state. The second throttling degree is less than the first throttling degree.

[0071] Figure 4 This illustration shows a schematic diagram of the refrigerant circulation state of the refrigeration system under counter-current defrosting conditions at low ambient temperatures, as disclosed in an embodiment of this application. The specific refrigerant circulation state is as follows: (1) After the compressor 10 starts, it compresses the low-pressure refrigerant into a high-temperature and high-pressure state and discharges it from the exhaust port 11 into the first end 21 of the reversing valve 20. As the controller controls the reversing valve 20 to switch the passage, it connects the first end 21 and the third end 23, and the refrigerant flows into the refrigeration evaporator 80 through the third end 23 of the reversing valve 20.

[0072] (2) The high-temperature and high-pressure refrigerant flows in the evaporator 80 and releases heat to melt the frost on the surface of the evaporator 80 (to achieve the defrosting function). Then it flows out of the evaporator 80 and enters the first throttling device 53 in the first branch 50 (at this time, the first throttling device 53 is at the second throttling level, which is less than the first throttling level). Because the first throttling device 53 at the second throttling level has less resistance to the refrigerant, the pressure and temperature of the refrigerant change little or even not after passing through the first throttling device 53.

[0073] (3) After the refrigerant flows out of the first throttling device 53, it flows into the refrigeration evaporator 52. At this time, the first air supply device is turned off to prevent the refrigeration chamber from being refrigerated, thus preventing excessive cooling of the refrigeration chamber and freezing of the fruits and vegetables inside.

[0074] (4) After the refrigerant flows out of the refrigeration evaporator 52, the controller controls the control valve 40 to open the common interface 41 and the second interface 43 and close other interfaces. Therefore, the refrigerant flows into the refrigeration throttling device 61 through the second branch 60, and the refrigeration throttling device 61 completes the throttling and pressure reduction function.

[0075] (5) After throttling, the refrigerant flows into the condenser 30 through the second port 43 of the control valve 40 → the common port 41. At this time, the second air supply device is turned on to diffuse the low temperature of the condenser 30 into the air.

[0076] (6) The controller controls the reversing valve 20 to connect the second end 22 and the fourth end 24. The refrigerant flows into the suction port 12 of the compressor 10 through the fourth end 24, completing a complete counter-flow defrosting-refrigeration coordinated cycle, and then enters the next cycle until defrosting is completed.

[0077] This embodiment reduces the refrigerant flow resistance by adjusting the first throttling device 53 to the second throttling level, avoiding excessive throttling that could cause the evaporator 52 to become too cold. The first air supply device is turned off to prevent cold air from spreading to the refrigerator compartment. At the same time, the refrigeration throttling device 61 undertakes the main throttling function to ensure stable system circulation. The second air supply device is turned on to accelerate the heat exchange of the condenser 30 to meet the heat demand in low-temperature environments. This design allows the refrigerator to achieve efficient defrosting through the freezer evaporator 80 in low-temperature environments, while avoiding food damage caused by abnormally low refrigerator compartment temperatures. It breaks through the limitations of traditional defrosting solutions in adapting to ambient temperature, enabling the refrigerator to balance the defrosting effect and the refrigerator compartment's preservation performance according to the ambient temperature, thus improving the refrigerator's environmental adaptability and reliability.

[0078] As an optional implementation, the control is specifically configured as follows: Obtain a reference table, which reflects the correspondence between different ambient temperatures and the degree of throttling of the refrigerant by the first throttling device 53, and there is a positive correlation between the ambient temperature and the degree of throttling of the first throttling device 53. Based on the comparison table and the current ambient temperature, determine the target throttling degree of the first throttling device 53; The compressor 10 and reversing valve 20 are controlled to make the refrigerant flow in reverse. The control valve 40 is controlled to open the passage between the common interface 41 and the second interface 43, close the passage between the common interface 41 and the first interface 42 and the third interface 44 respectively, adjust the first throttling device 53 to the target throttling degree, control the first air supply device to be in the closed state, and control the second air supply device to be in the open state.

[0079] It is easy to understand that the degree of throttling is negatively correlated with the opening degree of the control valve; the larger the opening degree, the smaller the degree of throttling.

[0080] In this embodiment, when the refrigerator is in counter-current defrosting mode, not only is the current ambient temperature obtained, but also a lookup table is obtained. Based on the lookup table and the current ambient temperature, the target throttling degree of the first throttling device 53 is determined, so that the throttling degree of the first throttling device 53 matches the current ambient temperature. When the ambient temperature is high, the throttling degree of the first throttling device 53 is increased to generate more cooling capacity; when the ambient temperature is low, the throttling degree of the first throttling device 53 is decreased to generate less cooling capacity.

[0081] As an optional implementation, the refrigerator further includes a third air supply device disposed at the freezer evaporator 80, and the cooling conditions include refrigeration cooling condition and freezing cooling condition. The controller is further configured to: In refrigeration operation, the compressor 10 and reversing valve 20 are controlled to make the refrigerant flow in the forward direction, the control valve 40 is controlled to open the passage between the common interface 41 and the second interface 43, close the passage between the common interface 41 and the first interface 42 and the third interface 44 respectively, adjust the first throttling device 53 to the second throttling degree, control the first air supply device to be in the open state, control the third air supply device to be in the closed state, and control the second air supply device to be in the open state; the second throttling degree is less than the first throttling degree.

[0082] Specifically, the third air supply device is installed at the refrigeration evaporator 80 and is controlled by the controller. It is used to start in the refrigeration mode to accelerate the air convection around the refrigeration evaporator 80, and to quickly and evenly diffuse the cold energy generated by the evaporation of the refrigerant in the refrigeration evaporator 80 to the freezer compartment, shorten the cooling time of the freezer compartment, and stabilize the temperature of the freezer compartment in the set low temperature range. It is turned off in the refrigeration mode only to avoid ineffective loss of cold energy and reduce unnecessary energy consumption.

[0083] Figure 5 The diagram illustrates the circulation state of the refrigerant in the refrigeration system disclosed in this application under refrigeration conditions. The specific circulation state of the refrigerant is as follows: (1) After the compressor 10 starts, it compresses the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous state, and discharges it from the exhaust port 11. It flows through the pipeline into the first end 21 of the reversing valve 20. At this time, the controller controls the reversing valve 20 to maintain the forward flow state, that is, to connect the first end 21 and the second end 22. The refrigerant flows into the condenser 30 through the second end 22 of the reversing valve 20.

[0084] (2) The controller controls the second air supply device of the condenser 30 to be turned on, which accelerates the heat exchange between the condenser 30 and the outside world. The high temperature and high pressure refrigerant releases heat in the condenser 30 and condenses into a medium temperature and high pressure liquid state. Then it flows out from the condenser 30 and enters the common interface 41 of the control valve 40.

[0085] (3) The controller controls the control valve 40 to open the passage between the common interface 41 and the second interface 43, and close the passage between the common interface 41 and the first interface 42 and the third interface 44 respectively. The refrigerant flows into the second branch 60 through the second interface 43, and then flows through the refrigeration throttling device 61 on the second branch 60. It is throttled and depressurized into a low temperature and low pressure gas-liquid mixture, and flows into the refrigeration evaporator 52.

[0086] (4) The controller controls the first air supply device to be turned on, accelerates air convection, and the refrigerant absorbs heat from the cold storage room in the refrigeration evaporator 52 and evaporates into a low-temperature gaseous state to achieve refrigeration of the cold storage room. Then it flows out from the refrigeration evaporator 52 and enters the first throttling device 53 on the first branch 50. The controller adjusts the first throttling device 53 to the second throttling level. Under this throttling level, the resistance of the first throttling device 53 is very small or even zero.

[0087] (5) After passing through the first throttling device 53, the refrigerant flows into the refrigeration evaporator 80. The controller controls the third air supply device to be in the closed state, so that the cold air is not blown to the freezer. The refrigeration evaporator 80 is only used as a flow channel. After flowing out of the refrigeration evaporator 80, it enters the third end 23 of the reversing valve 20. The controller controls the reversing valve 20 to open the connection between the third end 23 and the fourth end 24. The refrigerant flows into the suction port 12 of the compressor 10 through the fourth end 24, completing a complete refrigeration cycle. Then it enters the next cycle to maintain a stable low temperature in the freezer.

[0088] In refrigeration operation, the compressor 10 and reversing valve 20 are controlled to make the refrigerant flow in the forward direction, the control valve 40 is controlled to open the passage between the common interface 41 and the third interface 44, close the passage between the common interface 41 and the first interface 42 and the second interface 43 respectively, adjust the first throttling device 53 to the second throttling degree, control the first air supply device to be in the closed state, control the third air supply device to be in the open state, and control the second air supply device to be in the open state.

[0089] Figure 6 The diagram illustrates the circulation state of the refrigerant in the refrigeration system disclosed in this application under cold building refrigeration conditions. The specific circulation state of the refrigerant is as follows: (1) After the compressor 10 starts, it compresses the low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous state, and discharges it from the exhaust port 11. It flows through the pipeline into the first end 21 of the reversing valve 20. At this time, the controller controls the reversing valve 20 to maintain the forward flow state, that is, to connect the first end 21 and the second end 22. The refrigerant flows into the condenser 30 through the second end 22 of the reversing valve 20.

[0090] (2) The controller controls the second air supply device of the condenser 30 to be turned on, which accelerates the heat exchange between the condenser 30 and the outside world. The high temperature and high pressure refrigerant releases heat in the condenser 30 and condenses into a medium temperature and high pressure liquid state. Then it flows out from the condenser 30 and enters the common interface 41 of the control valve 40.

[0091] (3) The controller controls the control valve 40 to open the passage between the common interface 41 and the third interface 44, and close the passage between the common interface 41 and the first interface 42 and the second interface 43 respectively. The refrigerant flows into the second branch 70 through the third interface 44, and then flows through the refrigeration throttling device 71 on the second branch 70. It is throttled and depressurized into a low temperature and low pressure gas-liquid mixture, and flows into the refrigeration evaporator 80.

[0092] (4) The controller controls the third air supply device to be in the open state, accelerates air convection, and the refrigerant absorbs heat from the freezer chamber in the freezer evaporator 80 and evaporates into a low-temperature gaseous state to achieve refrigeration. Then it flows out from the freezer evaporator 80 and enters the third end 23 of the reversing valve 20.

[0093] (5) The controller controls the reversing valve 20 to connect the third end 23 and the fourth end 24, and at the same time controls the first air supply device to be in the closed state (to avoid cold interference). The refrigerant flows into the suction port 12 of the compressor 10 through the fourth end 24 to complete a complete refrigeration cycle, and then enters the next cycle to maintain a stable low temperature in the freezer.

[0094] When refrigeration and freezing are operating simultaneously, the compressor 10 and the reversing valve 20 are controlled to make the refrigerant flow in the forward direction. The control valve 40 is controlled to open the passage between the common interface 41 and the second interface 43 and the passage between the common interface 41 and the third interface 44, respectively, and close the passage between the common interface 41 and the first interface 42. The first throttling device 53 is adjusted to the third throttling level, and the first air supply device, the third air supply device, and the second air supply device are controlled to be in the open state. The third throttling level can form a throttling effect on the refrigerant.

[0095] Figure 7 The diagram illustrates the circulation state of the refrigerant in the refrigeration system disclosed in this application under refrigeration and cold storage conditions. The specific circulation states of the refrigerant are as follows: (1) After the compressor 10 starts, it compresses the low-pressure refrigerant into a high-temperature and high-pressure state and discharges it from the exhaust port 11 into the first end 21 of the reversing valve 20. As the controller controls the reversing valve 20 to switch the passage, it connects the first end 21 and the third end 23, and the refrigerant flows into the refrigeration evaporator 80 through the third end 23 of the reversing valve 20.

[0096] (2) The controller controls the second air supply device of the condenser 30 to be turned on, which accelerates the heat exchange between the condenser 30 and the outside world. The high temperature and high pressure refrigerant releases heat in the condenser 30 and condenses into a medium temperature and high pressure liquid state. Then it flows out from the condenser 30 and enters the common interface 41 of the control valve 40.

[0097] (3) The controller controls the control valve 40 to simultaneously open the passage between the common interface 41 and the second interface 43, and between the common interface 41 and the third interface 44, and close the passage between the common interface 41 and the first interface 42. The refrigerant is divided into two paths at the common interface 41: one path flows into the second branch 60 through the second interface 43, and after being throttled and depressurized by the refrigeration throttling device 61 to a low-temperature, low-pressure gas-liquid mixture, it flows into the refrigeration evaporator 52; the other path flows into the second branch 70 through the third interface 44, and after being throttled and depressurized by the freezing throttling device 71 to a low-temperature, low-pressure gas-liquid mixture, it flows into the freezing evaporator 80.

[0098] (4) The controller controls both the first and third air supply devices to be on, accelerating air convection in the refrigerator and freezer compartments respectively. The refrigerant flowing into the refrigerator evaporator 52 absorbs heat from the refrigerator compartment and evaporates into a low-temperature gaseous state, achieving refrigeration. Due to the increased temperature of the refrigerant flowing out of the refrigerator evaporator 52, in order to reduce the temperature of the refrigerant flowing out of the refrigerator evaporator 52, the controller controls the first throttling device 53 to the third throttling level (the third throttling level can be the same as or different from the first throttling level). The refrigerant flowing out of the first throttling device 53 (at this time, the temperature and pressure of the refrigerant are reduced) enters the freezer evaporator 80. The refrigerant flowing into the freezer evaporator 80 absorbs heat from the freezer compartment and evaporates into a low-temperature gaseous state, achieving refrigeration.

[0099] (5) The low-temperature gaseous refrigerant that has completed the refrigeration in the two circuits merges in the refrigeration evaporator 80 and flows out of the refrigeration evaporator 80 and enters the third end 23 of the reversing valve 20. The controller controls the reversing valve 20 to connect the third end 23 and the fourth end 24. The merged refrigerant flows into the suction port 12 of the compressor 10 through the fourth end 24, completing a complete refrigeration and freezing synergistic refrigeration cycle, and then enters the next cycle to maintain a stable low temperature in both chambers.

[0100] In this embodiment, by controlling the control valve 40, the refrigerant can flow through different branches, thereby cooling the refrigerator compartment, the freezer compartment, or both the refrigerator and freezer compartments simultaneously.

[0101] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0102] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0103] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps described in the various method embodiments above.

[0104] This application provides a computer program product that, when run on a refrigerator, enables the refrigerator to perform the steps described in the above-described method embodiments.

[0105] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying the computer program code to the refrigerator, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0106] Program code contained on a computer-readable medium may be transmitted using any suitable medium, including but not limited to wireless, wire, optical fiber, RF, etc., or any suitable combination thereof.

[0107] Computer program code for performing the operations of the embodiments of this application can be written in one or more programming languages ​​or a combination thereof. These programming languages ​​include object-oriented programming languages ​​such as Python, Java, Smalltalk, and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0108] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0109] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0110] In the embodiments provided in this application, it should be understood that the disclosed apparatus / refrigerator and method can be implemented in other ways. For example, the apparatus / refrigerator embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0111] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0112] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A refrigeration system, characterized in that, include: The compressor, reversing valve, refrigeration evaporator, and condenser are provided. The first end of the reversing valve is connected to the exhaust port of the compressor. The second and third ends of the reversing valve are connected to the refrigeration evaporator and the condenser, respectively. The fourth end of the reversing valve is connected to the suction port of the compressor. A first branch is provided between the condenser and the refrigeration evaporator. A refrigeration evaporator and a first throttling device are provided on the first branch. In counter-current defrosting mode, the reversing valve is configured to switch the refrigerant output from the compressor's exhaust port to the refrigeration evaporator; In the counter-current defrosting condition, after the refrigerant is condensed and dissipated in the refrigeration evaporator, it sequentially passes through the first throttling device in the first branch and the refrigeration evaporator into the condenser. The refrigeration evaporator is used to evaporate and cool the refrigerant entering the refrigeration evaporator. After absorbing heat in the condenser, the refrigerant returns to the compressor through the reversing valve.

2. The refrigeration system as described in claim 1, characterized in that, A first branch circuit is provided between the refrigerated evaporator and the condenser; In the counter-current defrosting condition, the refrigerant flowing out from the refrigeration evaporator passes through the first throttling device and the refrigeration evaporator, and then enters the condenser through the first branch. The first throttling device is configured to create a first throttling degree on the refrigerant, and the first air supply device of the refrigeration evaporator is configured to be in the open state to cool the refrigerator compartment.

3. The refrigeration system as described in claim 1, characterized in that, A second branch is provided between the refrigeration evaporator and the condenser, and a refrigeration throttling device is provided on the second branch; In the counter-current defrosting condition and when the ambient temperature is lower than the preset temperature, the refrigerant flowing out from the refrigeration evaporator passes through the first throttling device and the refrigeration evaporator, and then enters the condenser through the second branch. The first throttling device is configured to create a second throttling effect on the refrigerant.

4. The refrigeration system according to any one of claims 1 to 3, characterized in that, The refrigeration system also includes: The control valve includes a common interface, a first interface, a second interface, and a third interface, wherein the common interface is connected to one end of the condenser; The second branch is located between the third interface and the refrigeration evaporator, and a refrigeration throttling device is provided on the second branch. The first branch includes a first branch line disposed between the first interface and the refrigeration evaporator, and a second branch line disposed between the second interface and the refrigeration evaporator, wherein a refrigeration throttling device is disposed on the second branch line.

5. A refrigerator, characterized in that, include: The refrigeration system as described in claim 4, and the controller, the refrigerator compartment, the freezer compartment, the first air supply device located at the refrigerator evaporator and the second air supply device located at the condenser; The controller is configured to: When the refrigerator is in the counter-flow defrosting mode, the compressor and the reversing valve are controlled to cause the refrigerant to flow into the freezer evaporator in the reverse direction. The control valve is used to open the passage between the common interface and the first interface, and to close the passage between the common interface and the second interface and the third interface, respectively. Adjust the first throttling device to form a first throttling degree on the refrigerant, control the first air supply device to be in the open state, and control the second air supply device to be in the closed state.

6. The refrigerator as described in claim 5, characterized in that, The controller is also configured to: When the refrigerator is in the counter-flow defrosting mode, the current ambient temperature is obtained; When the ambient temperature is lower than the preset temperature, the control valve is controlled to open the passage between the common interface and the second interface, and close the passage between the common interface and the first interface and the third interface respectively; The first throttling device is adjusted to form a second throttling degree on the refrigerant, the first air supply device is controlled to be in a closed state, and the second air supply device is controlled to be in a closed state; the second throttling degree is less than the first throttling degree.

7. The refrigerator as described in claim 6, characterized in that, The controller is specifically configured as follows: Obtain a reference table, which reflects the correspondence between different ambient temperatures and the degree of throttling of the refrigerant by the first throttling device, and the ambient temperature is positively correlated with the degree of throttling of the first throttling device; Based on the reference table and the current ambient temperature, determine the target throttling degree of the first throttling device; The compressor and the reversing valve are controlled to make the refrigerant flow in reverse, and the control valve is controlled to open the passage between the common interface and the second interface, and close the passage between the common interface and the first interface and the third interface respectively; Adjust the first throttling device to the target throttling degree of the refrigerant, control the first air supply device to be in a closed state, and control the second air supply device to be in a closed state.

8. The refrigerator as described in any one of claims 5-7, characterized in that, The controller is specifically configured as follows: The compressor is started, and the reversing valve is controlled to open the passage between the first end and the third end, as well as the passage between the fourth end and the second end, so that the refrigerant flows in reverse.

9. The refrigerator as described in claim 5, characterized in that, The refrigerator also includes a third air supply device disposed at the freezer evaporator, and the controller is further configured to: In refrigeration operation, the compressor and the reversing valve are controlled to make the refrigerant flow in the forward direction. The control valve is controlled to open the passage between the common interface and the second interface, and to close the passage between the common interface and the first interface and the third interface respectively. The first throttling device is adjusted to form a second throttling degree on the refrigerant. The first air supply device is controlled to be in the open state, the third air supply device is controlled to be in the closed state, and the second air supply device is controlled to be in the open state; the second throttling degree is less than the first throttling degree. In refrigeration mode, the compressor and the reversing valve are controlled to make the refrigerant flow in the forward direction, the control valve is controlled to open the passage between the common interface and the third interface, and the passage between the common interface and the first interface and the second interface are closed respectively. The first throttling device is adjusted to form the second throttling degree of the refrigerant, the first air supply device is controlled to be in the off state, the third air supply device is controlled to be in the on state, and the second air supply device is controlled to be in the on state. When refrigeration and freezing are operating simultaneously, the compressor and the reversing valve are controlled to make the refrigerant flow in the forward direction. The control valve is controlled to open the passage between the common interface and the second interface and the passage between the common interface and the third interface, respectively, and to close the passage between the common interface and the first interface. The first throttling device is adjusted to form a third throttling degree on the refrigerant. The first air supply device is controlled to be in the open state, the third air supply device is controlled to be in the open state, and the second air supply device is controlled to be in the open state.

10. A method for controlling a refrigerator, characterized in that, The refrigerator is used to perform the actions executed by the controller in the refrigerator as described in any one of claims 5-9.

Images