Defrosting refrigerating system and refrigerator thereof

Abstract

The utility model relates to a defrosting refrigerating system and a refrigerator thereof, and belongs to the technical field of refrigerating systems, the defrosting refrigerating system comprises a compressor, the outlet of the compressor is connected with a three-way pipe, and the outlet of the compressor is connected with 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 utility model belongs to refrigeration system technical field especially relates to a defrosting refrigeration system and freezer thereof. BACKGROUND

[0002] Traditional direct-cooling freezers will have frost on the inner wall of the inner tank after long-term use, which not only affects the refrigeration effect, but also increases the user's use burden, and needs to be defrosted regularly by manual defrosting. In order to solve this problem, the defrosting is usually carried out by connecting the evaporator to the electric heating system. However, this defrosting method has obvious defects: during defrosting, the operation of the electric heater will cause the temperature in the box to rise, affecting the preservation effect of the food; at the same time, the electric heater is sealed in the box, and after being turned on, the local temperature rises rapidly, and the sponge, foam and plastic parts around it will be heated rapidly, which may cause deformation and even fire safety hazards. In addition, the electric heater is in direct contact with the evaporator, and if the refrigerant (such as R600A) in the evaporator leaks, it may also cause explosion risk when it comes into contact with the high-temperature heater in a closed space.

[0003] In order to overcome the above problems, some improvement schemes are proposed in the prior art. For example, Chinese utility model patent CN209541255U provides a frost-free refrigeration system for a refrigerator, which connects multiple evaporators and defrosting capillary tubes in parallel through an electromagnetic valve group, and adds an electromagnetic valve branch between the compressor and the condenser. By controlling the electromagnetic valve group, the evaporator is defrosted in turn and the pressure is maintained during shutdown, so as to replace the traditional electric heater and avoid the risk of electrical safety. However, the electromagnetic valve group of this patent is complex to set, which increases the manufacturing cost and maintenance difficulty of the system, and may have problems such as complex control logic, high failure rate, etc. in actual application.

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

[0005] In view of the deficiencies in the prior art, the utility model provides a defrosting refrigeration system and freezer thereof, which can reduce the manufacturing cost and maintenance difficulty of the system with a simple structure, and avoid the problem of high failure rate caused by complex control logic.

[0006] The utility model provides a defrosting refrigeration system, which comprises a compressor, a condensing assembly, a throttling assembly, a first evaporator, a second evaporator and a normally closed electromagnetic valve, wherein,

[0007] The compressor is connected with a three-way pipe at its outlet, and the outlet of the compressor is connected to the first end of the three-way pipe;

[0008] The inlet of the condensing assembly is connected to the second end of the three-way pipe;

[0009] The throttling assembly, having an inlet connected to an outlet of the condensing assembly, comprises a first capillary tube and a second capillary tube connected in parallel with each other;

[0010] The first evaporator, having an inlet connected to an outlet of the first capillary tube, is installed between the inner container of the refrigerator and the foaming layer outside the inner container;

[0011] The second evaporator, installed between the inner container of the refrigerator and the foaming layer outside the inner container, above the first evaporator and close to the cabinet door, or installed in the cabinet inside the inner container of the refrigerator, has an inlet connected to an outlet of the second capillary tube and the 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; a normally closed electromagnetic valve is further arranged between the second evaporator and the three-way pipe; in the refrigeration mode, the normally closed electromagnetic valve is in a closed state; in the defrosting mode, the normally closed electromagnetic valve is in an open state.

[0012] The technical solution can reduce the manufacturing cost and maintenance difficulty of the system, and avoid the problem of high failure rate caused by complex control logic.

[0013] In some embodiments, the defrosting refrigeration system further comprises a temperature controller, which is used to monitor a continuous working time of the refrigeration system and a temperature of the second evaporator, and to control the opening and closing of the normally closed electromagnetic valve to switch the refrigeration mode or the defrosting mode. Through the setting of the temperature controller, the continuous working time of the refrigeration system and the temperature of the second evaporator are monitored in real time, and the opening and closing of the normally closed electromagnetic valve are accurately controlled, so that the intelligent switching of the refrigeration mode and the defrosting mode is realized, and the efficient and stable operation of the system is ensured.

[0014] In some embodiments, the temperature controller comprises a first relay and a second relay connected in parallel with each other, the first relay is connected to the compressor, and the second relay is connected to the normally closed electromagnetic valve, and the second relay is used to control the opening and closing of the normally closed electromagnetic valve; in the refrigeration mode, the first relay is turned on and the second relay is turned off; in the defrosting mode, the first relay and the second relay are both turned on. Through the setting of the first relay and the second relay, the control complexity of the temperature controller is effectively reduced, and the stable switching of the refrigeration mode and the defrosting mode is ensured.

[0015] In some embodiments, a defrosting water evaporation tray is further arranged between the outlet of the compressor and the first end of the three-way pipe, and the defrosting water evaporation tray is used to evaporate the defrosting water by absorbing part of the heat of the gaseous refrigerant of the compressor. Through the setting of the defrosting water evaporation tray, the defrosting water is evaporated by skillfully using part of the heat of the gaseous refrigerant of the compressor, and the accumulation of the defrosting water is avoided, and the dry environment inside the equipment is maintained.

[0016] In some embodiments, the inlet end of the compressor is connected with a liquid storage tank for storing refrigerant, and the outlet of the first evaporator and the outlet of the second evaporator are combinedly connected to the inlet of the liquid storage tank.

[0017] In some embodiments, a drying filter is further arranged between the outlet end of the condensing assembly and the inlet end of the throttling assembly. The drying filter is arranged to effectively filter impurities in the refrigerant, remove moisture, prevent refrigerant pollution and ice blockage, optimize the refrigeration cycle, and improve the overall efficiency and reliability of the refrigeration system.

[0018] In some embodiments, the condensing assembly comprises an outer condenser and an inner condenser. The inlet end of the outer condenser is connected to the third end of the three-way pipe, and the outer condenser is installed in the refrigerator cabin. The inlet end of the inner condenser is connected to the outlet end of the outer condenser, and the inner condenser is installed between the inner side of the box shell and the foaming layer. The outer condenser and the inner condenser work together to increase the heat dissipation area, strengthen heat dissipation, significantly enhance the condensing effect, and improve the performance of the refrigeration system.

[0019] In some embodiments, the condensing assembly further comprises a dew prevention pipe installed between the outer condenser and the inner condenser. The inlet end of the dew prevention pipe is connected to the outlet end of the outer condenser, and the outlet end of the dew prevention pipe is connected to the inlet end of the inner condenser. The dew prevention pipe effectively utilizes the heat of the refrigerant, prevents condensation on the surface of the cabinet, improves the user experience, and avoids corrosion of the cabinet caused by condensation, thereby protecting the appearance and structural integrity of the equipment.

[0020] In addition, the utility model also provides a refrigerator which adopts the defrosting refrigeration system as described above, comprising a box body, an inner container and a box shell are arranged around the box body, and a foaming layer is arranged between the inner container and the box shell. A first evaporator is installed between the outer side of the inner container and the foaming layer. A second evaporator is installed in the box body on the inner side of the inner container, or is installed between the outer side of the inner container and the foaming layer of the refrigerator, above the first evaporator and close to the cabinet door.

[0021] Based on the above scheme, the defrosting refrigeration system in the embodiment of the utility model under the refrigeration mode, the refrigerant is circulated back to the compressor after passing through the compressor, the condensing assembly, the throttling assembly, the first evaporator and the second evaporator in turn, the first evaporator and the second evaporator can together cool the refrigerator, when the second evaporator is installed in the box, the second evaporator will absorb water vapor frost, and the first evaporator is installed between the inner container of the refrigerator and the foaming layer, and will not or rarely absorb water vapor frost, so the first evaporator does not need to defrost, the second evaporator is installed above the first evaporator and close to the cabinet door, the second evaporator preferentially absorbs water vapor frost, and water vapor will not or rarely reach the first evaporator below, so the first evaporator does not need to defrost. Figure 3 As shown in the figure, under the defrosting mode, the refrigerant is circulated back to the compressor after passing through the compressor, the normally closed electromagnetic valve and the second evaporator in turn, since the refrigerant output by the compressor is high-temperature and high-pressure gaseous refrigerant, the frost generated by the second evaporator can be melted when passing through the second evaporator, at this time, the first evaporator does not work, but the first evaporator still stores relatively cold refrigerant inside, which can ensure that the temperature of the items in the cabinet will not be too high. In summary, the defrosting refrigeration system in the embodiment of the utility model can realize the defrosting function without affecting the refrigeration effect through simple and unique structure, and avoids the serious frost problem of the traditional direct-cooling refrigerator in long-term use. Moreover, there is no complex electromagnetic valve group in the embodiment, the system structure is simpler, and the control is more convenient. Compared with the prior art, the manufacturing cost and maintenance difficulty of the system can be reduced, the high failure rate problem caused by the complex control logic can be avoided, and the reliability is higher. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are included to provide a further understanding of the utility model, constitute a part of the application, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0023] Figure 1 It is the structure schematic view of the defrosting refrigeration system in the embodiment of the utility model;

[0024] Figure 2 It is the refrigerant flow direction schematic view when the defrosting refrigeration system in the embodiment of the utility model is in the refrigeration mode;

[0025] Figure 3 It is the refrigerant flow direction schematic view when the defrosting refrigeration system in the embodiment of the utility model is in the defrosting mode;

[0026] Figure 4 It is the structure schematic view of the refrigerator in the embodiment of the utility model;

[0027] Figure 5 It is the cross-sectional schematic view of the refrigerator in the embodiment of the utility model.

[0028] In the drawings:

[0029] 1, compressor; 2, first capillary; 3, second capillary; 4, first evaporator; 5, second evaporator; 6, normally closed electromagnetic valve; 7, temperature controller; 701, first relay; 702, second relay; 8, defrosting water evaporation dish; 9, liquid storage tank; 10, drying filter; 11, outer condenser; 12, inner condenser; 13, anti-dew pipe; 14, box shell; 15, foaming layer; 16, inner container. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] The terms "first", "second", "third" are only for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second", "third" can explicitly or implicitly include one or more of the features.

[0033] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The terms "system", "unit", "module" used in this paper are a method for distinguishing different components, elements, parts, or assemblies at different levels, which can be replaced by other expressions with the same purpose.

[0035] As Figures 1-5 shown in one embodiment of the defrosting refrigeration system, the refrigerator and the control method of the utility model, the first aspect, as Figure 1 shown, the defrosting refrigeration system includes compressor 1, condensing assembly, throttling assembly, first evaporator 4, second evaporator 5, normally closed electromagnetic valve 6;Wherein, the three-way pipe is connected at the outlet of compressor 1, and the outlet of compressor 1 is connected to the first end of the three-way pipe;The condensing assembly inlet is connected to the second end of the three-way pipe;The throttling assembly inlet is connected to the outlet of the condensing assembly, including first capillary tube 2 and second capillary tube 3 parallel to each other;The first evaporator 4 inlet is connected to the outlet of the first capillary tube 2, and the first evaporator 4 is installed between the inner container 16 outside and the foaming layer 15 of the refrigerator;The second evaporator 5 is installed between the inner container 16 outside and the foaming layer 15 of the refrigerator, above the first evaporator 4 and close to the cabinet door, or installed in the box inside the inner container 16 of the refrigerator, the inlet of the second evaporator 5 is connected with the outlet of the second capillary tube 3 and the third end of the three-way pipe simultaneously, and the outlet of the first evaporator 4 and the outlet of the second evaporator 5 are connected to the inlet end of the compressor 1;The normally closed electromagnetic valve 6 is further arranged between the second evaporator 5 and the three-way pipe;In refrigeration mode, the normally closed electromagnetic valve 6 is in closed state;In defrosting mode, the normally closed electromagnetic valve 6 is in open state.

[0036] In the above schematic embodiment, as Figure 2 shown, in the defrosting refrigeration system, the refrigerant is circulated back to the compressor 1 after passing through the compressor 1, the condensing assembly, the throttling assembly, the first evaporator 4 and the second evaporator 5 in refrigeration mode, the first evaporator 4 and the second evaporator 5 can together cool the refrigerator, when the second evaporator 5 is installed in the box, the second evaporator 5 will absorb water vapor frost, and the first evaporator 4 is installed between the inner container 16 outside and the foaming layer 15 of the refrigerator, which will not or rarely absorb water vapor frost, so the first evaporator 4 does not need to be defrosted;The second evaporator 5 is installed above the first evaporator 4 and close to the cabinet door, the second evaporator 5 preferentially absorbs water vapor frost, and water vapor will not or rarely reach the first evaporator 4 below, so the first evaporator 4 does not need to be defrosted. As Figure 3As shown, in the defrosting mode, the refrigerant is circulated through the compressor 1, the normally closed electromagnetic valve 6 and the second evaporator 5 in turn, and then returns to the compressor 1, and since the refrigerant output by the compressor 1 is high-temperature and high-pressure gaseous refrigerant, the frost generated by the second evaporator 5 can be melted when passing through the second evaporator 5; at this time, the first evaporator 4 does not work, but the first evaporator 4 still stores relatively cold refrigerant, which can ensure that the temperature of the items in the cabinet will not be too high. In summary, the defrosting and refrigerating system in the embodiment of the utility model can realize the defrosting function without affecting the refrigerating effect through the simple and unique structure, and the problem of serious frost in the traditional direct-cooling refrigerator is avoided; and in the embodiment, there is no complex electromagnetic valve group, the system structure is simpler, and the control is more convenient, compared with the prior art, the manufacturing cost and maintenance difficulty of the system can be reduced, and the problem of high failure rate caused by complex control logic can be avoided, and the reliability is higher.

[0037] It should be noted that the type of the second evaporator 5 is not limited in the utility model, and can be selected from fin evaporators, coil evaporators, blown plate evaporators and the like.

[0038] In some embodiments, as shown in Figure 1 As shown, the defrosting and refrigerating system further comprises a temperature controller 7, the temperature controller 7 is used for monitoring the continuous working time of the refrigerating system and the temperature of the second evaporator 5, and is also used for controlling the opening and closing of the normally closed electromagnetic valve 6 to switch the refrigerating mode or the defrosting mode. Through the setting of the temperature controller 7, the continuous working time of the refrigerating system and the temperature of the second evaporator 5 are monitored in real time, and the opening and closing of the normally closed electromagnetic valve 6 is accurately controlled, the intelligent switching of the refrigerating mode and the defrosting mode is realized, the efficient and stable operation of the system is ensured, and the refrigerating effect and the energy utilization rate are improved.

[0039] Further, as shown in Figure 1 The temperature controller 7 comprises first and second relays 701 and 702 connected in parallel with each other, the first relay 701 is connected to the compressor 1, the second relay 702 is connected to the normally closed electromagnetic valve 6, and the second relay 702 is used for controlling the opening and closing of the normally closed electromagnetic valve 6; in the refrigerating mode, the first relay 701 is connected, and the second relay 702 is disconnected; in the defrosting mode, the first relay 701 and the second relay 702 are both connected. Through the setting of the first and second relays 701 and 702, the control complexity of the temperature controller 7 is effectively reduced, and the stable switching of the refrigerating mode and the defrosting mode is ensured.

[0040] In some embodiments, as shown in Figure 1As shown, the evaporator 4 is connected to the first end of the three-way pipe, and the second end of the three-way pipe is connected to the inlet of the compressor 1. Through the setting of the three-way pipe, the gaseous refrigerant of the compressor 1 is effectively utilized to evaporate the defrosting water, avoid the accumulation of defrosting water, keep the internal environment of the equipment dry, reduce the risk of equipment damage caused by accumulated water, and prolong the service life of the equipment.

[0041] In some embodiments, as shown in FIG. 1, the defrosting refrigeration system comprises a compressor 1, a first evaporator 4, a second evaporator 5, a condensing assembly, a throttling assembly, and a refrigeration assembly. 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. Through the setting of 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 ensured to be stable, and the stability and continuity of the refrigeration performance are improved.

[0042] In some embodiments, as shown in FIG. 1, the defrosting refrigeration system comprises a compressor 1, a first evaporator 4, a second evaporator 5, a condensing assembly, a throttling assembly, and a refrigeration assembly. Figure 1 As shown, a drying filter 10 is further provided between the outlet end of the condensing assembly and the inlet end of the throttling assembly. Through the setting of the drying filter 10, impurities in the refrigerant are effectively filtered, moisture is removed, refrigerant pollution and ice blockage phenomenon are prevented, refrigeration cycle is optimized, overall efficiency and reliability of the refrigeration system are improved, and equipment maintenance period is prolonged.

[0043] In some embodiments, as shown in FIG. 1, the defrosting refrigeration system comprises a compressor 1, a first evaporator 4, a second evaporator 5, a condensing assembly, a throttling assembly, and a refrigeration assembly. Figure 1 As shown, the condensing assembly comprises an outer condenser and an inner condenser; the inlet end of the outer condenser 11 is connected to the third end of the three-way pipe, and the outer condenser 11 is installed in the refrigerator cabin; the inlet end of the inner condenser 12 is connected to the outlet end of the outer condenser 11, and the inner condenser 12 is installed between the inner side of the box shell 14 and the foaming layer 15. Through the cooperative work of the outer condenser 11 and the inner condenser 12, the heat dissipation area can be increased, the heat dissipation is strengthened, the condensing effect is significantly enhanced, and the performance of the refrigeration system is improved.

[0044] In some embodiments, as shown in FIG. 1, the defrosting refrigeration system comprises a compressor 1, a first evaporator 4, a second evaporator 5, a condensing assembly, a throttling assembly, and a refrigeration assembly. Figure 1 As shown, the condensing assembly further comprises a dew pipe 13 installed between the outer condenser 11 and the inner condenser 12, the inlet end of the dew pipe 13 is connected to the outlet end of the outer condenser 11, and the outlet end of the dew pipe 13 is connected to the inlet end of the inner condenser 12. Through the setting of the dew pipe 13, the refrigerant heat can be effectively utilized, the condensation on the surface of the cabinet is prevented, the user experience is improved, and at the same time, corrosion of the cabinet caused by condensation is avoided, the appearance and structural integrity of the equipment are protected.

[0045] The defrosting refrigeration system in the above embodiments, as shown in FIG. 1, comprises a compressor 1, a first evaporator 4, a second evaporator 5, a condensing assembly, a throttling assembly, and a refrigeration assembly. Figure 2As shown, when in cooling mode, the refrigerant sequentially passes through compressor 1, defrost water evaporator 8, external condenser 11, anti-condensation pipe 13, internal condenser 12, and dryer filter 10, then simultaneously passes through first capillary tube 2, first evaporator 4, second capillary tube 3, and second evaporator 5, before entering the liquid receiver 9 through the outlet of first evaporator 4 and the outlet of second evaporator 5, and returning to compressor 1 from the liquid receiver 9 for circulation; as... Figure 3 As shown, when in defrost mode, the refrigerant passes through compressor 1, defrost water evaporator 8, normally closed solenoid valve 6, second evaporator 5, and liquid receiver 9 in sequence before returning to compressor 1 for circulation.

[0046] In some embodiments, in order to prevent refrigerant from flowing from the outlet of the second evaporator 5 to the outlet of the first evaporator 4 in defrost mode, a check valve or one-way valve is provided at the outlet of the first evaporator.

[0047] Secondly, such as Figure 4 As shown, this utility model also provides a freezer that uses the aforementioned defrosting refrigeration system, including a cabinet, with an inner liner 16 and a shell 14 surrounding the cabinet, and a foam layer 15 between the inner liner 16 and the shell 14; as shown Figure 5 As shown, the first evaporator 4 is installed between the outer side of the inner liner 16 and the foam layer 15; the second evaporator 5 is installed inside the cabinet on the inner side of the inner liner 16, or between the outer side of the inner liner 16 and the foam layer 15, above the first evaporator 4 near the cabinet door. The refrigerator using the above-mentioned defrosting refrigeration system, through the reasonable layout of the evaporator positions, can effectively improve refrigeration efficiency while ensuring the refrigeration range, ensuring a uniform and stable temperature inside the cabinet, providing a good environment for food preservation. At the same time, the optimized defrosting refrigeration system can avoid the frost problem of traditional direct-cooling refrigerators, reduce user maintenance costs, and improve the overall performance of the refrigerator and the user experience.

[0048] Thirdly, this utility model also provides a defrosting refrigeration control method, which is applied to the aforementioned defrosting refrigeration system. The defrosting refrigeration control method is used to control the switching of refrigeration mode or defrosting mode, including: such as... Figure 2 As shown, in cooling mode, the normally closed solenoid valve 6 is closed. The working process of cooling mode includes: compressor 1 outputs gaseous refrigerant, which enters the first end of the three-way pipe and then enters the condenser assembly through the second end of the three-way pipe for condensation. The resulting liquid refrigerant enters the throttling assembly and then 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 and vaporizes in the first evaporator 4 and the second evaporator 5. The first evaporator 4 and the second evaporator 5 output gaseous refrigerant, which then enters compressor 1 for circulation. Figure 3As shown, in the defrosting mode, the normally closed electromagnetic valve 6 is opened, and the working process of the defrosting 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 assembly causes the gaseous refrigerant to preferentially enter the second evaporator 5 through the third end of the three-way pipe, and the gaseous refrigerant melts the frost generated by the second evaporator 5 and then enters the compressor 1 for circulation.

[0049] In the above schematic embodiment, the defrosting and refrigeration control method is applied to a specific defrosting and refrigeration system, and the switching between the refrigeration and defrosting modes can be accurately controlled. In the refrigeration mode, the normally closed electromagnetic valve 6 is closed, the refrigerant circulates along a predetermined path, the refrigeration efficiency is ensured, the temperature in the refrigerator is stable, and a good preservation environment is maintained; in the defrosting mode, the normally closed electromagnetic valve 6 is opened, the resistance of the throttling assembly is used to make the gaseous refrigerant preferentially enter the second evaporator 5, effectively melt the frost, and avoid the influence of frost on the refrigeration effect, and at the same time, there is no need for electric heating defrosting, which avoids the problems of food preservation being affected, safety hazards, etc. caused by electric heating, and improves the stability, safety and practicality of the refrigerator operation.

[0050] In some embodiments, the method of controlling the switching between the refrigeration mode and the defrosting mode includes: entering the refrigeration mode when the refrigeration system is powered on; and switching to the defrosting mode when the continuous working time of the refrigeration system reaches a preset time threshold, or the temperature of the second evaporator 5 decreases to a preset temperature threshold. By setting the preset thresholds of the continuous working time of the refrigeration system and the temperature of the second evaporator 5, the switching between the refrigeration mode and the defrosting mode is automatically and reasonably realized, the refrigeration system is defrosted in time, the problems of excessive refrigeration or frost affecting are avoided, and the overall operation efficiency and refrigeration effect of the system are improved.

[0051] In some embodiments, when the refrigeration mode or the defrosting mode is switched, as shown, Figure 1 the temperature controller 7 is used for automatic switching; after the refrigeration system is powered on, the temperature controller 7 controls the normally closed electromagnetic valve 6 to be closed, and enters the refrigeration mode; when the temperature controller 7 monitors that the continuous working time of the refrigeration system reaches a preset time threshold, or the temperature of the second evaporator 5 decreases to a preset temperature threshold, the temperature controller 7 controls the normally closed electromagnetic valve 6 to be opened, and enters the defrosting mode. Specifically, the temperature controller 7 connects the first relay 701 and disconnects the second relay 702 to control the entry into the refrigeration mode; the temperature controller 7 connects the first relay 701 and the second relay 702 to control the entry into the defrosting mode. By using the temperature controller 7 to automatically control the opening and closing of the normally closed electromagnetic valve 6 according to the preset thresholds of the continuous working time of the refrigeration system and the temperature of the second evaporator 5, the automatic and accurate control of the switching between the modes is realized, the cost of manual intervention is reduced, and the intelligent degree and operation stability of the refrigeration system are improved.

[0052] Through the description of the plurality of embodiments of the defrosting refrigeration system, the refrigerator and the control method, it can be seen that the defrosting refrigeration system, the refrigerator and the control method have at least one or more of the following advantages.

[0053] 1、 the defrosting refrigeration system provided by the utility model, through simple and unique structure setting, can realize defrosting function without affecting refrigeration effect, avoid the situation that traditional direct cooling refrigerator is seriously frosted for long-term use;

[0054] 2、 the defrosting refrigeration system provided by the utility model does not have complex solenoid valve group setting, and the system structure is simpler, and control is more convenient, compared with prior art, can reduce the manufacturing cost and maintenance difficulty of system, at the same time, avoid the high failure rate problem caused by complex control logic, have higher reliability;

[0055] 3、 the refrigerator provided by the utility model, through reasonable layout evaporator position, under the premise of guaranteeing refrigeration range, can effectively improve refrigeration efficiency, ensure that the temperature in the box is uniform and stable, provide good environment for food preservation;

[0056] Finally, it should be explained that: each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments.

[0057] The above embodiments are only used to illustrate the technical scheme of the utility model and not to limit it; Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the specific embodiments of the utility model can be modified or some technical features can be replaced equivalently; Without departing from the spirit of the technical scheme of the utility model, it should be covered in the technical scheme range of the utility model claimed in the utility model.

Claims

1. A defrosting refrigeration system characterized by, The system comprises a compressor, a condensing assembly, a throttling assembly, a first evaporator, a second evaporator, and a normally closed electromagnetic valve. The compressor is connected with a three-way pipe at its outlet end. The condensing assembly is connected with the second end of the three-way pipe at its inlet end. The throttling assembly is connected with the outlet end of the condensing assembly at its inlet end and comprises a first capillary tube and a second capillary tube connected in parallel. The first evaporator is connected with the outlet end of the first capillary tube at its inlet end and is installed between the inner container and the foaming layer outside the inner container of the refrigerator. The second evaporator is installed between the inner container and the foaming layer outside the inner container of the refrigerator above the first evaporator near the door or in the box inside the inner container of the refrigerator.

2. The defrost refrigeration system of claim 1, wherein, The outlet end of the first evaporator and the outlet end of the second evaporator are connected with the inlet end of the compressor.

3. The defrost refrigeration system of claim 2, wherein, A normally closed electromagnetic valve is arranged between the second evaporator and the three-way pipe.

4. The defrost refrigeration system of claim 1, wherein, In the refrigeration mode, the normally closed electromagnetic valve is closed.

5. The defrost refrigeration system of claim 1, wherein, In the defrosting mode, the normally closed electromagnetic valve is opened.

6. The defrost refrigeration system of claim 1, wherein, The temperature controller is used to monitor the continuous working time of the refrigeration system and the temperature of the second evaporator and to control the opening and closing of the normally closed electromagnetic valve to switch between the refrigeration mode and the defrosting mode.

7. The defrost refrigeration system of claim 1, wherein The temperature controller comprises a first relay and a second relay connected in parallel.

8. The defrost refrigeration system of claim 7, wherein, The first relay is connected with the compressor.

9. A refrigerator, characterized by The second relay is connected with the normally closed electromagnetic valve and is used to control the opening and closing of the normally closed electromagnetic valve. In the refrigeration 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. A defrosting water evaporation dish is arranged between the outlet end of the compressor and the first end of the three-way pipe. The defrosting water evaporation dish is used to absorb part of the heat of the gaseous refrigerant of the compressor to evaporate the defrosting water. The inlet end of the compressor is connected with a liquid storage tank for storing refrigerant. The outlet end of the first evaporator and the outlet end of the second evaporator are connected with the inlet end of the liquid storage tank. A drying filter is arranged between the outlet end of the condensing assembly and the inlet end of the throttling assembly. The condensing assembly comprises an outer condenser and an inner condenser. The inlet end of the outer condenser is connected with the third end of the three-way pipe. The outer condenser is installed in the engine room of the refrigerator. The inlet end of the inner condenser is connected with the outlet end of the outer condenser. The outer condenser is installed between the outer condenser and the inner condenser. The outlet end of the defrosting pipe is connected with the inlet end of the inner condenser. The defrosting refrigeration system comprises a box, an inner container and a box shell arranged around the box, a foaming layer arranged between the inner container and the box shell, a first evaporator installed between the inner container and the foaming layer outside the inner container, and a second evaporator installed in the box inside the inner container or installed between the inner container and the foaming layer outside the inner container above the first evaporator near the door of the refrigerator.

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