Defrosting refrigeration system and refrigerator and control method thereof

Abstract

The invention relates to a defrosting refrigerating system and a refrigerator and a control method thereof, and belongs to the technical field of refrigerating systems.The defrosting refrigerating system comprises a compressor, a three-way pipe is connected to an outlet of the compressor, and the outlet of the compressor is connected to the first end of the three-way pipe; the condensation assembly inlet is connected to the second end of the three-way pipe; the throttling assembly inlet is connected to the condensation assembly outlet and comprises a first capillary tube and a second capillary tube which are connected in parallel. The first evaporator inlet is connected to the first capillary outlet, and the first evaporator is installed between the outer side of an inner container of the refrigerator and a foaming layer; the second evaporator is mounted in the box on the inner side of the refrigerator liner, an inlet of the second evaporator is simultaneously connected with an outlet of the second capillary and a third end of the three-way pipe, and an outlet of the first evaporator and an outlet of the second evaporator are combined and connected to an inlet end of the compressor; and a normally closed electromagnetic valve is also arranged between the second evaporator and the three-way pipe. According to the defrosting refrigerating system, the manufacturing cost and maintenance difficulty of the system can be reduced, and meanwhile the problem of high failure rate is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of refrigeration systems, and in particular relates to a defrosting refrigeration system, a refrigerator and a control method thereof. Background Art

[0002] After long-term use, traditional direct cooling freezers will have frost on the inner wall of the box, which not only affects the refrigeration effect, but also increases the user's usage burden, and requires regular manual defrosting. In order to solve this problem, the evaporator is usually connected to the electric heating system for defrosting. However, this defrosting method has obvious defects: during the defrosting period, the operation of the electric heater will cause the temperature in the box to rise, affecting the preservation effect of food; at the same time, the electric heater is enclosed in the box, and the local temperature rises rapidly after it is turned on. The surrounding sponges, foams, plastic parts and other materials will be quickly heated, posing a safety hazard of deformation or even fire. In addition, the electric heater is in direct contact with the evaporator. If the refrigerant in the evaporator (such as R600A) leaks and comes into contact with the high-temperature heater in a confined space, it may also cause an explosion risk.

[0003] In order to overcome the above problems, some improvement schemes have been proposed in the prior art. For example, Chinese utility model patent CN209541255U provides a frost-free refrigeration system for a refrigerator. The patent connects multiple evaporators and defrosting capillaries in parallel through a solenoid valve group, and adds a solenoid valve branch between the compressor and the condenser. By controlling the solenoid valve group, the evaporator can be defrosted in turn and the pressure can be maintained during shutdown, thereby replacing the traditional electric heater and avoiding electrical safety risks. However, the solenoid valve group of the patent is relatively complex, which increases the manufacturing cost and maintenance difficulty of the system, and there may be problems such as complex control logic and high failure rate in actual application.

[0004] Therefore, there is an urgent need for a frost-free refrigeration system with simple structure, convenient control, safety and reliability to solve the above problems existing in the prior art. Summary of the invention

[0005] In view of the shortcomings in the prior art, the present invention provides a defrosting refrigeration system and a refrigerator and a control method thereof, which, with a simple structure, can reduce the manufacturing cost and maintenance difficulty of the system, while avoiding the high failure rate problem that may be caused by complex control logic.

[0006] In a first aspect, the present invention provides a defrosting refrigeration system, comprising a compressor, a condensing assembly, a throttling assembly, a first evaporator, a second evaporator, and a normally closed solenoid valve; wherein:

[0007] A compressor, the outlet of which is connected to a tee pipe, wherein the outlet of the compressor is connected to a first end of the tee pipe;

[0008] a condensing assembly, the inlet of which is connected to the second end of the tee pipe;

[0009] A throttling assembly, the inlet of which is connected to the outlet of the condensing assembly, comprising a first capillary tube and a second capillary tube connected in parallel;

[0010] A first evaporator, the inlet of which is connected to the outlet of the first capillary tube, and the first evaporator is installed between the outer side of the inner tank of the refrigerator and the foaming layer;

[0011] The second evaporator is installed between the outer side of the inner tank of the refrigerator and the foaming layer, above the first evaporator near the cabinet door, or installed in the box inside the inner tank of the refrigerator. The inlet of the second evaporator is connected to the outlet of the second capillary tube and the third end of the three-way pipe at the same time. The outlet of the first evaporator and the outlet of the second evaporator are combined and connected to the inlet end of the compressor; a normally closed solenoid valve is also provided between the second evaporator and the three-way pipe; in the refrigeration mode, the normally closed solenoid valve is in a closed state; in the defrost mode, the normally closed solenoid valve is in an open state.

[0012] This technical solution can reduce the manufacturing cost and maintenance difficulty of the system, while avoiding the high failure rate problem that may be caused by complex control logic.

[0013] In some embodiments, the defrosting refrigeration system further includes a thermostat, which is used to monitor the continuous working time of the refrigeration system and the temperature of the second evaporator, and is also used to control the opening and closing of the normally closed solenoid valve to switch the refrigeration mode or the defrosting mode. This technical solution monitors the continuous working time of the refrigeration system and the temperature of the second evaporator in real time through the setting of the thermostat, and accurately controls the opening and closing of the normally closed solenoid valve, thereby realizing the intelligent switching of the refrigeration and defrosting modes and ensuring the efficient and stable operation of the system.

[0014] In some embodiments, the thermostat includes a first relay and a second relay connected in parallel, the first relay is connected to the compressor, the second relay is connected to the normally closed solenoid valve, and the second relay is used to control the opening and closing of the normally closed solenoid valve; in the cooling mode, the first relay is connected and the second relay is disconnected; in the defrosting mode, the first relay and the second relay are both connected. This technical solution effectively reduces the control complexity of the thermostat by setting the first relay and the second relay, and ensures stable switching between the cooling mode and the defrosting mode.

[0015] In some embodiments, a defrost water evaporation dish is further provided between the compressor outlet and the first end of the three-way pipe, and the defrost water evaporation dish is used to absorb part of the heat of the compressor gaseous refrigerant to evaporate defrost water. This technical solution cleverly utilizes part of the heat of the compressor gaseous refrigerant to evaporate defrost water through the provision of the defrost water evaporation dish, thereby avoiding the accumulation of defrost water and keeping the internal environment of the equipment dry.

[0016] In some embodiments, the inlet end of the compressor is connected to a liquid storage tank for storing refrigerant, and the outlet of the first evaporator and the outlet of the second evaporator are combined and connected to the inlet of the liquid storage tank. This technical solution effectively stores refrigerant, stabilizes refrigerant flow and pressure, buffers refrigerant fluctuations, and ensures stable refrigerant supply of the refrigeration system through the provision of a liquid storage tank.

[0017] In some embodiments, a drying filter is further provided between the outlet of the condensing assembly and the inlet of the throttling assembly. This technical solution can efficiently filter impurities in the refrigerant, remove moisture, prevent refrigerant contamination and ice blockage, optimize the refrigeration cycle, and improve the overall efficiency and reliability of the refrigeration system through the provision of the drying filter.

[0018] In a second aspect, the present invention also provides a refrigerator, adopting the defrost refrigeration system as described above, comprising a box body, wherein an inner liner and a box shell are arranged around the box body, and a foaming layer is arranged between the inner liner and the box shell; a first evaporator is installed between the outer side of the inner liner and the foaming layer; a second evaporator is installed in the box body inside the inner liner, or installed between the outer side of the inner liner of the refrigerator and the foaming layer, above the first evaporator and close to the cabinet door.

[0019] This technical solution can avoid the frosting problem of traditional direct cooling freezers, reduce user maintenance costs, and improve the overall performance of the freezer and user experience.

[0020] In a third aspect, the present invention further provides a defrosting refrigeration control method, which is applied to the defrosting refrigeration system as described above. The defrosting refrigeration control method is used to control the switching of the refrigeration mode or the defrosting mode, and includes:

[0021] In the refrigeration mode, the normally closed solenoid valve is controlled to be closed. The working process of the refrigeration mode includes: the compressor outputs gaseous refrigerant, the gaseous refrigerant enters the first end of the three-way pipe, and enters the condensation component through the second end of the three-way pipe for condensation, the liquid refrigerant obtained after condensation enters the throttling component, and enters the first evaporator and the second evaporator through the first capillary tube and the second capillary tube respectively, the liquid refrigerant absorbs heat in the first evaporator and the second evaporator to vaporize, the first evaporator and the second evaporator output gaseous refrigerant, and the gaseous refrigerant enters the compressor for circulation;

[0022] In the defrost mode, the normally closed solenoid valve is controlled to open. The working process of the defrost mode includes: the compressor outputs gaseous refrigerant, the gaseous refrigerant enters the first end of the three-way pipe, and the resistance of the throttling component makes the gaseous refrigerant enter the second evaporator through the third end of the three-way pipe first. The gaseous refrigerant melts the frost produced by the second evaporator and then enters the compressor for circulation.

[0023] This technical solution is applied to a specific defrosting refrigeration system and can accurately control the switching between refrigeration and defrosting modes.

[0024] In some embodiments, the method for controlling the switching of the refrigeration mode or the defrost mode includes: entering the refrigeration mode when the refrigeration system is powered on; switching to the defrost mode when the continuous working time of the refrigeration system reaches a preset time threshold, or the temperature of the second evaporator drops to a preset temperature threshold. The technical solution controls the mode switching by setting the preset thresholds of the continuous working time of the refrigeration system and the temperature of the second evaporator, thereby realizing the automatic and reasonable conversion between the refrigeration and defrost modes, and ensuring that the refrigeration system is defrosted in time.

[0025] In some embodiments, when switching between the refrigeration mode and the defrost mode, the thermostat is used for automatic switching; after the refrigeration system is powered on, the thermostat controls the normally closed solenoid valve to close and enter the refrigeration mode; when the thermostat detects that the continuous working time of the refrigeration system reaches a preset time threshold, or the temperature of the second evaporator drops to a preset temperature threshold, the thermostat controls the normally closed solenoid valve to open and enter the defrost mode. This technical solution uses the thermostat to automatically control the opening and closing of the normally closed solenoid valve to switch modes based on the continuous working time of the refrigeration system and the preset threshold of the second evaporator temperature, thereby realizing automatic and precise control of mode switching.

[0026] Based on the above scheme, the defrost refrigeration system and the refrigerator and control method thereof in the embodiment of the present invention are such that when the defrost refrigeration system is in refrigeration mode, the refrigerant passes through the compressor, the condensing component, the throttling component, the first evaporator and the second evaporator in sequence, and then returns to the compressor for circulation. The first evaporator and the second evaporator can cool the refrigerator together. When the second evaporator is installed in the cabinet, the second evaporator will absorb water vapor to form frost, while the first evaporator is installed between the outer side of the inner tank of the refrigerator and the foaming layer, and will not or very little absorb water vapor to form frost. Therefore, the first evaporator does not need to be defrosted. The second evaporator is installed above the first evaporator near the cabinet door. The second evaporator preferentially absorbs water vapor to form frost, and water vapor will not or very little reach the first evaporator below. Therefore, the first evaporator does not need to be defrosted. Figure 3 As shown, in the defrost mode, the refrigerant passes through the compressor, the normally closed solenoid valve, and the second evaporator in sequence, and then returns to the compressor for circulation. Since the refrigerant output by the compressor is a high-temperature and high-pressure gaseous refrigerant, it can melt the frost produced by the second evaporator when passing through the second evaporator; at this time, the first evaporator is not working, but the first evaporator still contains a relatively cold refrigerant, which can ensure that the temperature of the items in the cabinet will not be too high. In summary, the defrost refrigeration system in the embodiment of the present invention can achieve the defrost function without affecting the refrigeration effect through a simple and unique structural setting, thereby avoiding the serious frosting caused by long-term use of traditional direct cooling freezers; and, in this embodiment, there is no complicated solenoid valve group setting, the system structure is simpler, and the control is more convenient. Compared with the prior art, it can reduce the manufacturing cost and maintenance difficulty of the system, while avoiding the high failure rate problem caused by complex control logic, and has higher reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0028] Figure 1 It is a structural schematic diagram of a defrosting refrigeration system in an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the refrigerant flow direction when the defrosting refrigeration system is in the refrigeration mode in an embodiment of the present invention;

[0030] Figure 3 It is a schematic diagram of the refrigerant flow direction when the defrosting refrigeration system is in the defrosting mode in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of a refrigerator in an embodiment of the present invention;

[0032] Figure 5 Schematic cross-sectional view of a refrigerator in an embodiment of the present invention.

[0033] In the figure:

[0034] 1. Compressor; 2. First capillary tube; 3. Second capillary tube; 4. First evaporator; 5. Second evaporator; 6. Normally closed solenoid valve; 7. Thermostat; 701. First relay; 702. Second relay; 8. Defrosting water evaporating dish; 9. Liquid storage tank; 10. Dry filter; 11. External condenser; 12. Internal condenser; 13. Anti-dew pipe; 14. Box shell; 15. Foaming layer; 16. Inner tank. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0037] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] like Figure 1-Figure 5 As shown, in one embodiment of the defrosting refrigeration system and the refrigerator and control method of the present invention, in the first aspect, as Figure 1 As shown, the defrosting refrigeration system includes a compressor 1, a condensing assembly, a throttling assembly, a first evaporator 4, a second evaporator 5, and a normally closed solenoid valve 6; wherein, a three-way pipe is connected to the outlet of the compressor 1, and the outlet of the compressor 1 is connected to the first end of the three-way pipe; the inlet of the condensing assembly is connected to the second end of the three-way pipe; the inlet of the throttling assembly is connected to the outlet of the condensing assembly, including a first capillary tube 2 and a second capillary tube 3 connected in parallel with each other; the inlet of the first evaporator 4 is connected to the outlet of the first capillary tube 2, and the first evaporator 4 is installed between the outer side of the inner tank 16 of the refrigerator and the foaming layer 15 The second evaporator 5 is installed between the outer side of the inner tank 16 of the refrigerator and the foaming layer 15, above the first evaporator 4 near the cabinet door, or installed in the box inside the inner tank 16 of the refrigerator. The inlet of the second evaporator 5 is connected to the outlet of the second capillary tube 3 and the third end of the three-way pipe at the same time. The outlet of the first evaporator 4 and the outlet of the second evaporator 5 are combined and connected to the inlet end of the compressor 1; a normally closed solenoid valve 6 is also provided between the second evaporator 5 and the three-way pipe; in the refrigeration mode, the normally closed solenoid valve 6 is in a closed state; in the defrosting mode, the normally closed solenoid valve 6 is in an open state.

[0040] In the above exemplary embodiments, Figure 2As shown, in the defrost refrigeration system, in the refrigeration mode, the refrigerant passes through the compressor 1, the condensing component, the throttling component, the first evaporator 4 and the second evaporator 5 in sequence, and then returns to the compressor 1 for circulation. The first evaporator 4 and the second evaporator 5 can cool the refrigerator together. When the second evaporator 5 is installed in the cabinet, the second evaporator 5 will absorb water vapor and frost, while the first evaporator 4 is installed between the outer side of the inner liner 16 of the refrigerator and the foaming layer 15, and will not or very little absorb water vapor and frost, and the first evaporator 4 does not need to be defrosted; when the second evaporator 5 and the first evaporator 4 are both installed between the outer side of the inner liner 16 of the refrigerator and the foaming layer 15, the second evaporator 5 is installed above the first evaporator 4 near the cabinet door, and the second evaporator 5 preferentially absorbs water vapor and frost, and water vapor will not or very little reach the first evaporator 4 below, so the first evaporator 4 does not need to be defrosted. Figure 3 As shown, in the defrost mode, the refrigerant passes through the compressor 1, the normally closed solenoid valve 6, and the second evaporator 5 in sequence, and then returns to the compressor 1 for circulation. Since the refrigerant output by the compressor 1 is a high-temperature and high-pressure gaseous refrigerant, when passing through the second evaporator 5, it can melt the frost produced by the second evaporator 5; at this time, the first evaporator 4 is not working, but the first evaporator 4 still contains a relatively cold refrigerant, which can ensure that the temperature of the items in the cabinet will not be too high. In summary, the defrost refrigeration system in the embodiment of the present invention can achieve the defrost function without affecting the refrigeration effect through a simple and unique structural setting, thereby avoiding the serious frosting caused by long-term use of traditional direct cooling freezers; and, in this embodiment, there is no complicated solenoid valve group setting, the system structure is simpler, and the control is more convenient. Compared with the prior art, it can reduce the manufacturing cost and maintenance difficulty of the system, while avoiding the high failure rate problem caused by complex control logic, and has higher reliability.

[0041] It should be noted that the present invention does not limit the type of the second evaporator 5 , and a fin evaporator, a coil evaporator, a blowing plate evaporator, etc. can be selected.

[0042] In some embodiments, Figure 1 As shown, the defrosting refrigeration system also includes a thermostat 7, which is used to monitor the continuous working time of the refrigeration system and the temperature of the second evaporator 5, and is also used to control the opening and closing of the normally closed solenoid valve 6 to switch the refrigeration mode or the defrosting mode. Through the setting of the thermostat 7, the continuous working time of the refrigeration system and the temperature of the second evaporator 5 are monitored in real time, and the opening and closing of the normally closed solenoid valve 6 are accurately controlled to realize the intelligent switching of the refrigeration and defrosting modes, ensure the efficient and stable operation of the system, and improve the refrigeration effect and energy utilization.

[0043] Furthermore, if Figure 1As shown, the thermostat 7 includes a first relay 701 and a second relay 702 connected in parallel, the first relay 701 is connected to the compressor 1, the second relay 702 is connected to the normally closed solenoid valve 6, and the second relay 702 is used to control the opening and closing of the normally closed solenoid valve 6; in the cooling mode, the first relay 701 is turned on and the second relay 702 is turned off; in the defrosting mode, the first relay 701 and the second relay 702 are both turned on. By setting the first relay 701 and the second relay 702, the control complexity of the thermostat 7 is effectively reduced, ensuring stable switching between the cooling mode and the defrosting mode.

[0044] In some embodiments, Figure 1 As shown, a defrost water evaporation dish 8 is further provided between the outlet of the compressor 1 and the first end of the three-way pipe, and the defrost water evaporation dish 8 is used to absorb part of the heat of the gaseous refrigerant of the compressor 1 to evaporate defrost water. Through the provision of the defrost water evaporation dish 8, part of the heat of the gaseous refrigerant of the compressor 1 is cleverly utilized to evaporate the defrost water, thereby avoiding the accumulation of defrost water, keeping the internal environment of the equipment dry, reducing the risk of equipment damage caused by water accumulation, and extending the service life of the equipment.

[0045] In some embodiments, Figure 1 As shown, the inlet end of the compressor 1 is connected to a liquid storage tank 9 for storing refrigerant, and the outlet of the first evaporator 4 and the outlet of the second evaporator 5 are combined and connected to the inlet of the liquid storage tank 9. By setting the liquid storage tank 9, the refrigerant is effectively stored, the refrigerant flow and pressure are stabilized, the refrigerant fluctuation is buffered, the refrigerant supply of the refrigeration system is guaranteed to be stable, and the stability and sustainability of the refrigeration performance are improved.

[0046] In some embodiments, Figure 1 As shown, a drying filter 10 is also provided between the outlet end of the condensing component and the inlet end of the throttling component. Through the provision of the drying filter 10, impurities in the refrigerant are efficiently filtered, moisture is removed, refrigerant contamination and ice blockage are prevented, the refrigeration cycle is optimized, the overall efficiency and reliability of the refrigeration system are improved, and the equipment maintenance cycle is extended.

[0047] In some embodiments, Figure 1 As shown, the condensing assembly includes an external condenser and an internal condenser; the inlet end of the external condenser 11 is connected to the third end of the three-way pipe, and the external condenser 11 is installed in the refrigerator compartment; the inlet end of the internal condenser 12 is connected to the outlet end of the external condenser 11, and the internal condenser 12 is installed between the inner side of the box shell 14 and the foaming layer 15. Through the coordinated work of the external condenser 11 and the internal condenser 12, the heat dissipation area can be increased, the heat dissipation can be strengthened, the condensation effect can be significantly enhanced, and the performance of the refrigeration system can be improved.

[0048] In some embodiments, Figure 1As shown, the condensing assembly also includes an anti-condensation pipe 13 installed between the outer condenser 11 and the inner condenser 12, the inlet end of the anti-condensation pipe 13 is connected to the outlet end of the outer condenser 11, and the outlet end of the anti-condensation pipe 13 is connected to the inlet end of the inner condenser 12. Through the provision of the anti-condensation pipe 13, the heat of the refrigerant can be effectively utilized to prevent condensation on the cabinet surface, improve the user experience, and at the same time avoid corrosion of the cabinet due to condensation, protecting the appearance and structural integrity of the equipment.

[0049] The defrosting refrigeration system in the above embodiment, such as Figure 2 As shown, when in cooling mode, the refrigerant passes through the compressor 1, the defrost water evaporator 8, the external condenser 11, the anti-condensation pipe 13, the internal condenser 12, the drying filter 10 in sequence, and passes through the first capillary 2, the first evaporator 4 and the second capillary 3, the second evaporator 5, and then enters the liquid storage tank 9 through the outlet of the first evaporator 4 and the outlet of the second evaporator 5, and returns to the compressor 1 through the liquid storage tank 9 for circulation; Figure 3 As shown, when in defrost mode, the refrigerant passes through the compressor 1, the defrost water evaporator 8, the normally closed solenoid valve 6, the second evaporator 5, the liquid storage tank 9 in sequence, and then returns to the compressor 1 for circulation.

[0050] In some embodiments, in order to prevent the refrigerant from flowing from the outlet of the second evaporator 5 to the outlet of the first evaporator 4 in the defrost mode, a check valve or a one-way valve is provided at the outlet of the first evaporator.

[0051] Second, as Figure 4 As shown, the present invention also provides a refrigerator, which adopts the above-mentioned defrosting refrigeration system, including a box body, an inner liner 16 and a box shell 14 are arranged around the box body, and a foaming layer 15 is arranged between the inner liner 16 and the box shell 14; Figure 5 As shown, the first evaporator 4 is installed between the outer side of the inner liner 16 and the foaming layer 15; the second evaporator 5 is installed in the box inside the inner liner 16, or installed between the outer side of the inner liner 16 and the foaming layer 15 of the refrigerator, above the first evaporator 4 near the cabinet door. The refrigerator adopting the above-mentioned defrosting refrigeration system can effectively improve the refrigeration efficiency and ensure the uniform and stable temperature in the box under the premise of ensuring the refrigeration range by reasonably arranging the evaporator positions, providing a good environment for food preservation. At the same time, the optimized defrosting refrigeration system can avoid the frosting problem of traditional direct cooling refrigerators, reduce user maintenance costs, and improve the overall performance of the refrigerator and user experience.

[0052] In a third aspect, the present invention further provides a defrosting refrigeration control method, which is applied to the above-mentioned defrosting refrigeration system, and the defrosting refrigeration control method is used to control the switching of the refrigeration mode or the defrosting mode, including: Figure 2As shown, in the refrigeration mode, the normally closed solenoid valve 6 is controlled to be closed, and the working process of the refrigeration mode includes: the compressor 1 outputs gaseous refrigerant, the gaseous refrigerant enters the first end of the three-way pipe, and enters the condensation component through the second end of the three-way pipe for condensation, and the liquid refrigerant obtained after condensation enters the throttling component, and enters the first evaporator 4 and the second evaporator 5 through the first capillary tube 2 and the second capillary tube 3 respectively, the liquid refrigerant absorbs heat in the first evaporator 4 and the second evaporator 5 to vaporize, the first evaporator 4 and the second evaporator 5 output gaseous refrigerant, and the gaseous refrigerant enters the compressor 1 for circulation; as shown in FIG. Figure 3 As shown, in the defrost mode, the normally closed solenoid valve 6 is controlled to open, and the working process of the defrost mode includes: the compressor 1 outputs gaseous refrigerant, the gaseous refrigerant enters the first end of the three-way pipe, and the resistance of the throttling component makes the gaseous refrigerant preferentially enter the second evaporator 5 through the third end of the three-way pipe. The gaseous refrigerant melts the frost produced by the second evaporator 5 and then enters the compressor 1 for circulation.

[0053] In the above exemplary embodiment, the defrosting refrigeration control method is applied to a specific defrosting refrigeration system, and can accurately control the switching between refrigeration and defrosting modes. In the refrigeration mode, the normally closed solenoid valve 6 is closed, and the refrigerant circulates along a predetermined path to ensure the refrigeration efficiency, stabilize the temperature in the refrigerator, and maintain a good fresh-keeping environment; in the defrosting mode, the normally closed solenoid valve 6 is opened, and the resistance of the throttling component is used to allow the gaseous refrigerant to enter the second evaporator 5 first, effectively melting the frost and avoiding the frost from affecting the refrigeration effect. At the same time, there is no need for electric heating for defrosting, which avoids the problems of food preservation being affected and safety hazards caused by electric heating, and improves the stability, safety and practicality of the refrigerator operation.

[0054] In some embodiments, the method for controlling the switching of the refrigeration mode or the defrost mode includes: entering the refrigeration mode when the refrigeration system is powered on; switching to the defrost mode when the continuous working time of the refrigeration system reaches a preset time threshold, or the temperature of the second evaporator 5 drops to a preset temperature threshold. By setting the continuous working time of the refrigeration system and the preset threshold of the temperature of the second evaporator 5 to control the mode switching, the automatic and reasonable conversion of the refrigeration and defrost modes is realized, ensuring that the refrigeration system is defrosted in time, avoiding the influence of over-refrigeration or frosting, and improving the overall operation efficiency and refrigeration effect of the system.

[0055] In some embodiments, when switching between cooling mode and defrosting mode, Figure 1As shown, the thermostat 7 is used for automatic switching; after the refrigeration system is powered on, the thermostat 7 controls the normally closed solenoid valve 6 to close and enter the refrigeration mode; when the thermostat 7 detects that the continuous working time of the refrigeration system reaches the preset time threshold, or the temperature of the second evaporator 5 drops to the preset temperature threshold, the thermostat 7 controls the normally closed solenoid valve 6 to open and enter the defrost mode. Specifically, the thermostat 7 turns on the first relay 701 and disconnects the second relay 702 to control the entry into the refrigeration mode; the thermostat 7 simultaneously turns on the first relay 701 and the second relay 702 to control the entry into the defrost mode. The thermostat 7 automatically controls the opening and closing of the normally closed solenoid valve 6 to switch the mode according to the preset threshold of the continuous working time of the refrigeration system and the temperature of the second evaporator 5, thereby realizing the automatic and precise control of the mode switching, reducing the cost of manual intervention, and improving the intelligence and operation stability of the refrigeration system.

[0056] Through the description of multiple embodiments of the defrosting refrigeration system and the refrigerator and control method of the present invention, it can be seen that the defrosting refrigeration system and the refrigerator and control method of the present invention have at least one or more of the following advantages:

[0057] 1. The defrosting refrigeration system provided by the present invention can realize the defrosting function without affecting the refrigeration effect through a simple and unique structural setting, thereby avoiding the serious frosting of the traditional direct cooling freezer during long-term use, and there is no complicated solenoid valve group setting, the system structure is simpler, and the control is more convenient;

[0058] 2. The refrigerator provided by the present invention can effectively improve the refrigeration efficiency and ensure the uniform and stable temperature inside the box by reasonably arranging the position of the evaporator while ensuring the refrigeration range, thus providing a good environment for food preservation;

[0059] 3. The defrosting refrigeration system control method provided by the present invention is applied to a specific defrosting refrigeration system and can accurately control the switching between refrigeration and defrosting modes.

[0060] Finally, it should be noted that: the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] The above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A defrosting refrigeration system, characterized in that: It includes a compressor, a condensing component, a throttling component, a first evaporator, a second evaporator, and a normally closed solenoid valve; wherein, A compressor, the outlet of which is connected to a tee pipe, wherein the outlet of the compressor is connected to a first end of the tee pipe; a condensing assembly, the inlet of which is connected to the second end of the tee pipe; A throttling assembly, the inlet of which is connected to the outlet of the condensing assembly, comprising a first capillary tube and a second capillary tube connected in parallel; A first evaporator, the inlet of which is connected to the outlet of the first capillary tube, and the first evaporator is installed between the outer side of the inner tank of the refrigerator and the foaming layer; The second evaporator is installed between the outer side of the inner tank of the refrigerator and the foaming layer, above the first evaporator near the cabinet door, or installed in the box inside the inner tank of the refrigerator. The inlet of the second evaporator is connected to the outlet of the second capillary tube and the third end of the three-way pipe at the same time. The outlet of the first evaporator and the outlet of the second evaporator are combined and connected to the inlet end of the compressor; a normally closed solenoid valve is also provided between the second evaporator and the three-way pipe; in the refrigeration mode, the normally closed solenoid valve is in a closed state; in the defrost mode, the normally closed solenoid valve is in an open state.

2. The defrosting refrigeration system according to claim 1, characterized in that: It also includes a thermostat, which is used to monitor the continuous working time of the refrigeration system and the temperature of the second evaporator, and is also used to control the opening and closing of the normally closed solenoid valve to switch the refrigeration mode or the defrosting mode.

3. The defrosting refrigeration system according to claim 2, characterized in that: The thermostat includes a first relay and a second relay connected in parallel, the first relay is connected to the compressor, the second relay is connected to the normally closed solenoid valve, and the second relay is used to control the opening and closing of the normally closed solenoid valve; in the refrigeration mode, the first relay is connected and the second relay is disconnected; in the defrost mode, the first relay and the second relay are both connected.

4. The defrosting refrigeration system according to claim 1, characterized in that: A defrost water evaporation dish is also provided between the compressor outlet and the first end of the three-way pipe. The defrost water evaporation dish is used to absorb part of the heat of the gaseous refrigerant of the compressor to evaporate defrost water.

5. The defrosting refrigeration system according to claim 1, characterized in that: The inlet end of the compressor is connected to a liquid storage tank for storing refrigerant, and the outlet of the first evaporator and the outlet of the second evaporator are combined and connected to the inlet of the liquid storage tank.

6. The defrosting refrigeration system according to claim 1, characterized in that: A drying filter is also provided between the outlet end of the condensing component and the inlet end of the throttling component.

7. A refrigerator, characterized in that: A defrost refrigeration system as described in any one of claims 1 to 6 is adopted, comprising a box body, an inner liner and a box shell are arranged around the box body, and a foaming layer is arranged between the inner liner and the box shell; a first evaporator is installed between the outer side of the inner liner and the foaming layer; a second evaporator is installed in the box body inside the inner liner, or installed between the outer side of the inner liner of the refrigerator and the foaming layer, above the first evaporator near the cabinet door.

8. A defrosting refrigeration control method, characterized in that: Applied to the defrosting refrigeration system according to any one of claims 1 to 6, the defrosting refrigeration control method is used to control the switching of the refrigeration mode or the defrosting mode, comprising: In the refrigeration mode, the normally closed solenoid valve is controlled to be closed. The working process of the refrigeration mode includes: the compressor outputs gaseous refrigerant, the gaseous refrigerant enters the first end of the three-way pipe, and enters the condensation component through the second end of the three-way pipe for condensation, the liquid refrigerant obtained after condensation enters the throttling component, and enters the first evaporator and the second evaporator through the first capillary tube and the second capillary tube respectively, the liquid refrigerant absorbs heat in the first evaporator and the second evaporator to vaporize, the first evaporator and the second evaporator output gaseous refrigerant, and the gaseous refrigerant enters the compressor for circulation; In the defrost mode, the normally closed solenoid valve is controlled to open. The working process of the defrost mode includes: the compressor outputs gaseous refrigerant, the gaseous refrigerant enters the first end of the three-way pipe, and the resistance of the throttling component makes the gaseous refrigerant enter the second evaporator through the third end of the three-way pipe first. The gaseous refrigerant melts the frost produced by the second evaporator and then enters the compressor for circulation.

9. The defrosting refrigeration control method according to claim 8, characterized in that: The method for controlling switching between refrigeration mode and defrost mode includes: entering refrigeration mode when the refrigeration system is powered on; switching to defrost mode when the continuous working time of the refrigeration system reaches a preset time threshold, or the temperature of the second evaporator drops to a preset temperature threshold.

10. The defrosting refrigeration control method according to claim 9, characterized in that: When switching between refrigeration mode and defrost mode, the thermostat is used for automatic switching; after the refrigeration system is powered on, the thermostat controls the normally closed solenoid valve to close and enters the refrigeration mode; when the thermostat monitors that the continuous working time of the refrigeration system reaches the preset time threshold, or the temperature of the second evaporator drops to the preset temperature threshold, the thermostat controls the normally closed solenoid valve to open and enters the defrost mode.

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