Refrigerator

Abstract

The invention particularly relates to a refrigerator which comprises a refrigerator body and a refrigerating system arranged in the refrigerator body, a freezing chamber and a cold storage chamber are defined in the refrigerator body, and the refrigerating system comprises a refrigerating loop formed by a compressor, a condenser, a first throttling component and a freezing evaporator which are sequentially connected through a pipeline. The freezing evaporator is arranged in the freezing chamber, and a fan adjacent to the freezing evaporator is further arranged in the freezing chamber; the refrigerator further comprises an air outlet duct, an air return duct and an air return evaporator, wherein the air outlet duct and the air return duct are communicated with the refrigerating chamber and the freezing chamber respectively, and the air return evaporator is arranged in the air return duct. And the return air evaporator is selectively connected to a pipeline at the inlet end or the outlet end of the freezing evaporator. According to the refrigerator, through the return air evaporator arranged in the return air duct, heat exchange between hot air flow in the refrigeration chamber and the return air evaporator is facilitated, and the refrigerator has the advantages of being energy-saving, efficient, high in refrigeration efficiency, simple in air duct structure, high in space utilization rate and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of refrigeration, in particular to a refrigerator. Background Art

[0002] In a single-system refrigerator, when the refrigerator compartment is refrigerated, the return hot air in the refrigerator compartment is returned to the freezer compartment, mixed with the cold air in the freezer compartment, cooled by the evaporator, and then blown back to the refrigerator compartment, thereby cooling the refrigerator compartment. This leads to the following problems:

[0003] ① The freezing temperature of the freezing room is affected by the hot air of the refrigerated return air, and the temperature fluctuates greatly;

[0004] ② The refrigeration evaporator is affected by the hot air from the refrigeration return air, which is more likely to frost and affect the refrigeration speed;

[0005] ③ Due to the large size of the refrigeration evaporator, the defrost cycle of the refrigerator freezer compartment is short and the defrost time is long.

[0006] The dual-system refrigerator of the prior art can solve the above problems. The evaporator and the fan are separately arranged in the refrigerating compartment and the freezing compartment. The refrigerating compartment and the freezing compartment are not interconnected, and the temperature of the freezing compartment will not be affected by the refrigerating compartment.

[0007] The disadvantages of the dual system refrigerator of the prior art are as follows:

[0008] ① The evaporator and fan of the cold storage room need to be designed separately, which leads to increased costs and reduced volume;

[0009] ②Dual-system refrigerators need to be equipped with solenoid valves, and there are many welding points. There is a risk of leakage of welding points and solenoid valves, which may lead to frozen vegetables in the refrigerated compartment.

[0010] Therefore, it is necessary to study a refrigerator to solve the above problems. Summary of the invention

[0011] The present invention aims to provide a refrigerator with high energy saving and high refrigeration efficiency, simple air duct structure, high space utilization and low cost.

[0012] In order to achieve the above objectives, an embodiment of the present invention provides a refrigerator, comprising a box body, a refrigeration system arranged in the box body, wherein a freezing compartment and a refrigerating compartment are defined in the box body, the refrigeration system comprises a refrigeration circuit formed by a compressor, a condenser, a first throttling component, and a freezing evaporator connected in sequence through pipelines, the freezing evaporator is arranged in the freezing compartment, and a fan adjacent to the freezing evaporator is also arranged in the freezing compartment;

[0013] The refrigerator further includes an air outlet duct and an air return duct respectively connecting the refrigerating compartment and the freezing compartment, and a return air evaporator disposed in the return air duct;

[0014] Wherein, the return air evaporator can be selectively connected to the pipeline at the inlet end or the outlet end of the refrigeration evaporator.

[0015] As a further improvement of one embodiment of the present invention, it also includes a first solenoid valve connected between the refrigeration evaporator and the return air evaporator, wherein the first solenoid valve has one inlet and two outlets;

[0016] An inlet of the first solenoid valve is connected to the outlet of the refrigeration evaporator;

[0017] The two outlets of the first solenoid valve are respectively connected to the inlet end of the return air evaporator and the inlet end of the compressor;

[0018] Wherein, the outlet end of the return air evaporator is connected to the inlet end of the compressor.

[0019] As a further improvement of an embodiment of the present invention, it further includes a second solenoid valve connected between the first throttling component and the return air evaporator, wherein the second solenoid valve has an inlet and two outlets;

[0020] An inlet of the second solenoid valve is connected to an outlet end of the first throttling component;

[0021] The two outlets of the second solenoid valve pass through the inlet end of the return air evaporator and the inlet end of the refrigeration evaporator respectively;

[0022] Wherein, the outlet end of the return air evaporator is connected to the inlet end of the refrigeration evaporator through a pipeline.

[0023] As a further improvement of one embodiment of the present invention, the refrigerator further includes a second throttling component connected between the outlet end of the return air evaporator and the inlet end of the freezing evaporator.

[0024] As a further improvement of an embodiment of the present invention, the refrigerating compartment is arranged on the upper side of the freezing compartment;

[0025] The return air duct is extended from top to bottom, and the two ends of the return air duct are respectively provided with a return air inlet and a return air outlet communicating with the refrigerating compartment and the freezing compartment, and the return air inlet is arranged above the return air outlet;

[0026] Wherein, the return air evaporator is arranged in the middle area of ​​the return air duct.

[0027] As a further improvement of an embodiment of the present invention, the return air duct includes a receiving chamber for receiving the return air evaporator, a first return air duct connecting the receiving chamber with the return air inlet, and a second return air duct connecting the receiving chamber with the return air outlet;

[0028] Wherein, the first return air duct and the second return air duct are staggered in the vertical direction and arranged at two end openings of the accommodating chamber.

[0029] As a further improvement of an embodiment of the present invention, it also includes a return air structure for defining the return air duct;

[0030] The return air structure includes, from top to bottom, a first return air structure for forming the first return air duct, a receiving structure for forming the receiving chamber, and a second return air structure for forming the second return air duct;

[0031] The containing structure comprises a vertical containing structure connected to the first air return structure, and a horizontal containing structure connected to the second air return structure formed by the lateral extension of the vertical containing structure;

[0032] The return air evaporator is fixed on the inner wall of the vertical containing structure.

[0033] As a further improvement of one embodiment of the present invention, it also includes a defrosting heating wire arranged on the return air evaporator;

[0034] The vertical receiving structure defines a vertical receiving chamber for receiving the return air evaporator;

[0035] The bottom wall of the vertical containing structure is recessed downward from the edge to the center, and a defrost drain pipe communicating with the vertical containing chamber is arranged at the center of the bottom wall of the vertical containing structure.

[0036] As a further improvement of an embodiment of the present invention, the horizontal accommodation structure defines a horizontal accommodation chamber that communicates with the vertical accommodation chamber;

[0037] The top of the second air return structure extends into the horizontal containing structure, and the top of the second air return structure is higher than the bottom wall of the horizontal containing structure;

[0038] The bottom wall of the horizontal containing structure is higher than the bottom wall of the vertical containing structure, and the bottom wall of the horizontal containing structure is horizontally inclined downward in a direction from away from the vertical containing structure to close to the vertical containing structure.

[0039] As a further improvement of an embodiment of the present invention, the return air evaporator includes a plurality of fin groups spaced apart in the vertical direction, the fin group includes a plurality of fins distributed in the horizontal direction, and the fins are extended in the vertical direction.

[0040] Compared with the prior art, the beneficial effect of the present invention is that: the refrigerator provided by the present invention arranges the freezing evaporator and the fan in the freezing compartment, and respectively arranges the outlet duct and the return duct connecting the cold storage compartment and the freezing compartment, and the fan guides at least part of the airflow after the freezing evaporator is cooled into the cold storage compartment through the outlet duct, thereby achieving the purpose of cooling and supplying air to the cold storage compartment of the single-system refrigerator, and the return air evaporator arranged in the return air duct facilitates the heat exchange between the hot air flow in the cold storage compartment and the return air evaporator, and the temperature of the air flow is reduced after cooling, and then enters the freezing compartment, which can avoid the freezing evaporator from being too high in temperature and the freezing compartment from fluctuating greatly in temperature, so as to reduce the frost of the freezing evaporator, so the maximum frost cycle of the freezing evaporator is longer and the defrosting time is shorter. The return air evaporator is located in the return air duct, does not occupy the volume of the cold storage compartment, and does not need to be provided with a cold storage fan, so the cost is lower. It has the advantages of energy saving and high efficiency, high refrigeration efficiency, simple air duct structure, space utilization rate and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the refrigerator of the present invention;

[0042] Figure 2 It is a structural schematic diagram of the refrigerator of the present invention in a rearward direction;

[0043] Figure 3 A schematic diagram of the structure of the first connection mode of the refrigeration system of the present invention;

[0044] Figure 4 A schematic diagram of the structure of the second connection mode of the refrigeration system of the present invention;

[0045] Figure 5 It is a structural schematic diagram of the return air structure of the refrigerator of the present invention;

[0046] Figure 6 It is a schematic diagram of the structure of the return air structure of the refrigerator of the present invention in a top view;

[0047] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure in the AA direction.

[0048] In the figure: 1. cabinet; 11. freezer compartment; 12. refrigerator compartment; 2. refrigeration system; 21. compressor; 22. condenser; 23. first throttling component; 24. freezer evaporator; 25. return air evaporator; 251. fin group; 26. first solenoid valve; 27. second solenoid valve; 28. second throttling component; 3. return air structure; 30. return air duct; 31. return air inlet; 32. return air outlet; 33. first return air duct; 34. containing chamber; 341. vertical containing chamber; 342. horizontal containing chamber; 35. second return air duct; 36. first return air structure; 37. containing structure; 371. vertical containing structure; 372. recessed surface; 373. horizontal containing structure; 38. second return air structure; 4. defrost heating wire; 5. defrost drain pipe. DETAILED DESCRIPTION

[0049] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0050] The terms "including" and "having" and any variations thereof in the present invention are intended to cover non-exclusive inclusions. Reference to "embodiments" herein means that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0051] Combination Figures 1 to 3 As shown, the present invention mainly relates to: a refrigerator, which includes a box body 1 and a refrigeration system 2 arranged in the box body 1. The box body 1 includes an inner tank, and a freezing compartment 11 and a refrigerating compartment 12 are defined in the inner tank.

[0052] In this embodiment, the refrigeration system 2 is a single-system refrigeration system. The refrigeration system 2 includes a refrigeration circuit formed by a compressor 21, a condenser 22, a first throttling component 23, and a freezing evaporator 24 connected in sequence through pipelines. The refrigerant flows from the compressor 21 to the condenser 22, the first throttling component 23, the freezing evaporator 24 in sequence, and then returns to the compressor 21, forming a refrigeration cycle.

[0053] Specifically, the compressor 21 inhales the relatively low-pressure working fluid vapor refrigerant coming out of the refrigeration evaporator 24, increases its pressure and then sends it to the condenser 22, where it is condensed into a relatively high-pressure liquid refrigerant. After being throttled by the first throttling component 23, it becomes a relatively low-pressure liquid and is then sent to the refrigeration evaporator 24, where it absorbs heat and evaporates to become a relatively low-pressure vapor refrigerant, which is then sent to the inlet of the compressor 21, thereby completing the refrigeration cycle.

[0054] The freezing evaporator 24 is disposed in the freezing compartment 11, and a fan adjacent to the freezing evaporator 24 is also disposed in the freezing compartment 11. The fan causes at least part of the airflow cooled by the freezing evaporator 24 to circulate in the freezing compartment 11 for refrigeration.

[0055] The refrigerator further includes an air outlet duct and an air return duct 30 respectively connecting the refrigerating compartment 12 and the freezing compartment 11. The air outlet duct and the air return duct 30 are separately and independently arranged.

[0056] When the refrigerating compartment 12 is refrigerating, at least part of the cold airflow in the freezing compartment 11 enters the refrigerating compartment 12 through the air outlet duct driven by the fan, and the hot airflow in the refrigerating compartment 12 enters the freezing compartment 11 through the return air duct 30, so as to complete the circulation of airflow. When the refrigerating compartment 12 does not need to be refrigerated, the air outlet duct is closed.

[0057] Preferably, the refrigerator further comprises a refrigeration damper for closing the air outlet duct in a controlled manner.

[0058] The refrigerator further includes a return air evaporator 25 disposed in the return air duct 30. When the refrigerating compartment 12 is refrigerating, when the hot air flow in the refrigerating compartment 12 passes through the return air duct 30, the hot air flow in the refrigerating compartment 12 exchanges heat with the return air evaporator 25, and the air flow is cooled and the temperature is lowered before entering the freezing compartment 11, which can avoid the freezing evaporator 24 from being too high in temperature and the freezing compartment 11 from having a large temperature fluctuation, thereby reducing the frost on the freezing evaporator 24. Therefore, the maximum defrosting cycle of the freezing evaporator 24 is longer, and the defrosting time is shorter, which has the advantages of energy saving, high efficiency, and high refrigeration efficiency.

[0059] Furthermore, since the return air evaporator 25 is located in the return air duct 30 and the freezing evaporator 24 is located in the freezing compartment 11, the two evaporators have little influence on each other, and the freezing evaporator 24 can be at a low temperature and the return air evaporator 25 can be at a high temperature. The low temperature of the freezing evaporator 24 ensures the freezing speed of the freezing compartment 11. The high temperature of the return air evaporator 25 increases the return air pressure of the compressor 21 and reduces the pressure ratio of the compressor 21, thereby improving the reliability of the compressor 21 and reducing the energy consumption of the system.

[0060] Compared with the dual-system refrigerator of the prior art, the return air evaporator 25 of the present invention is located in the return air duct 30, does not occupy the volume of the refrigerating compartment 12, and does not require a refrigerating fan, so the cost is lower. In addition, the structural components of the air supply and return air of the present invention are simple, thereby further reducing the cost and improving the space utilization.

[0061] The return air evaporator 25 can be selectively connected to the pipeline at the inlet end or the outlet end of the refrigeration evaporator 24 .

[0062] When the refrigerating compartment 12 is refrigerating, the return air evaporator 25 is connected to the pipeline at the inlet end or the outlet end of the freezing evaporator 24, and the return air evaporator 25 is in the on state, and the return air evaporator 25 exchanges heat with the hot air flow of the return air duct 30. When the freezing compartment 11 is refrigerating, the return air evaporator 25 is in the off state, and the refrigeration circuit formed by the compressor 21, the condenser 22, the first throttling component 23, and the freezing evaporator 24 is in the on state. It has the advantages of easy implementation and reduced cost.

[0063] refer to Figure 3 As shown, in the first connection mode of the return air evaporator 25, the refrigerator further comprises a first solenoid valve 26 connected between the freezing evaporator 24 and the return air evaporator 25, and the first solenoid valve 26 has one inlet and two outlets. The first solenoid valve 26 is used to realize the purpose of switching the return air evaporator 25 to the outlet end of the freezing evaporator, which has the advantage of convenient switching control.

[0064] Specifically, one inlet of the first solenoid valve 26 is connected to the outlet of the refrigeration evaporator 24. Two outlets of the first solenoid valve 26 are respectively connected to the inlet of the return air evaporator 25 and the inlet of the compressor 21. The outlet of the return air evaporator 25 is connected to the inlet of the compressor 21.

[0065] When the refrigerating compartment 12 is refrigerated, the outlet end of the freezing evaporator 24 is connected to the return air evaporator 25 and the compressor 21 in sequence through the first solenoid valve 26. Thus, the compressor 21, the condenser 22, the first throttling component 23, the freezing evaporator 24, and the return air evaporator 25 are connected in sequence to form a refrigeration cycle. The air outlet duct is opened, and at least part of the cold air flow in the freezing compartment 11 enters the refrigerating compartment 12 through the air outlet duct under the drive of the fan. The hot air flow in the refrigerating compartment 12 exchanges heat with the return air evaporator 25 through the return air duct 30. The air flow is cooled and the temperature is reduced, and then enters the freezing compartment 11 to complete the circulation of the air flow.

[0066] When the freezing chamber 11 is refrigerated, the outlet end of the freezing evaporator 24 is directly connected to the inlet end of the compressor 21 through the first solenoid valve 26, so that the compressor 21, the condenser 22, the first throttling component 23, and the freezing evaporator 24 are connected in sequence to form a refrigeration cycle. The air outlet duct is closed, and at least part of the airflow after cooling the freezing evaporator 24 circulates in the freezing chamber 11 for refrigeration.

[0067] refer to Figure 4 As shown in the second connection mode of the return air evaporator 25, the refrigerator further includes a second solenoid valve 27 connected between the first throttling component 23 and the return air evaporator 25. The second solenoid valve 27 has an inlet and two outlets. The purpose of switching the return air evaporator 25 to the inlet end of the freezer evaporator is achieved by the second solenoid valve 27, which has the advantage of convenient switching control.

[0068] Specifically, one inlet of the second solenoid valve 27 is connected to the outlet of the first throttling component 23. The two outlets of the second solenoid valve 27 pass through the inlet of the return air evaporator 25 and the inlet of the freezing evaporator 24 respectively. The outlet of the return air evaporator 25 is connected to the inlet of the freezing evaporator 24 through a pipeline.

[0069] The second connection mode of the return air evaporator 25 ensures that the temperature of the return air evaporator 25 is lower by allowing the refrigerant to pass through the return air evaporator 25 first, thereby achieving a better cooling effect on the hot air flow of the refrigerating compartment 12 and smaller temperature fluctuations in the freezing compartment 11.

[0070] When the refrigerating compartment 12 is refrigerating, the outlet end of the first throttling component 23 is connected to the return air evaporator 25 and the freezing evaporator 24 in sequence through the second solenoid valve 27, so that the compressor 21, the condenser 22, the first throttling component 23, the return air evaporator 25, and the freezing evaporator 24 are connected in sequence to form a refrigeration cycle. The air outlet duct is opened, and at least part of the airflow in the freezing compartment 11 enters the refrigerating compartment 12 through the air outlet duct under the drive of the fan. The hot airflow in the refrigerating compartment 12 exchanges heat with the return air evaporator 25 through the return air duct 30. The airflow is cooled and the temperature is reduced, and then enters the freezing compartment 11 to complete the circulation of the airflow.

[0071] When the freezing chamber 11 is refrigerated, the outlet end of the freezing evaporator 24 is directly connected to the inlet end of the compressor 21 through the second solenoid valve 27, so that the compressor 21, the condenser 22, the first throttling component 23, and the freezing evaporator 24 are connected in sequence to form a refrigeration cycle. The air outlet duct is closed, and at least part of the airflow after cooling the freezing evaporator 24 circulates in the freezing chamber 11 for refrigeration.

[0072] Furthermore, the refrigerator further includes a second throttling component 28 connected between the outlet end of the return air evaporator 25 and the inlet end of the freezing evaporator 24. When the refrigerating compartment 12 is refrigerated, the outlet end of the first throttling component 23 is sequentially connected to the return air evaporator 25 and the freezing evaporator 24 through the second solenoid valve 27, so that the compressor 21, the condenser 22, the first throttling component 23, the return air evaporator 25, the second throttling component 28, and the freezing evaporator 24 are sequentially connected to form a refrigeration cycle. The throttling effect of the second throttling component 28 can maintain a lower pressure in the freezing evaporator 24, and the temperature of the freezing evaporator 24 is also lower, so the freezing compartment 11 can be maintained at a lower freezing temperature.

[0073] Further, the refrigerating compartment 12 is arranged on the upper side of the freezing compartment 11. In the present embodiment, the refrigerating compartment 12 is arranged adjacent to the upper side of the freezing compartment 11. It is understandable that a variable temperature compartment may also be arranged between the refrigerating compartment 12 and the freezing compartment 11.

[0074] refer to Figure 5 As shown, the return air duct 30 extends from top to bottom, and the two ends of the return air duct 30 are respectively provided with a return air inlet 31 and a return air outlet 32 ​​communicating with the refrigerating compartment 12 and the freezing compartment 11. The return air evaporator 25 is arranged between the return air inlet 31 and the return air outlet 32.

[0075] The return air inlet 31 is disposed above the return air outlet 32. The return air duct 30 is connected to the refrigerating compartment 12 through the return air inlet 31, and the return air duct 30 is connected to the freezing compartment 11 through the return air outlet 32. The hot air flow in the refrigerating compartment 12 enters the return air duct 30 through the return air inlet 31 to exchange heat with the return air evaporator 25, and the air flow is cooled and the temperature is lowered, and then enters the freezing compartment 11 through the return air outlet 32.

[0076] The return air evaporator 25 is disposed in the middle area of ​​the return air duct 30 , so that the hot air flow in the refrigerated compartment 12 can fully exchange heat with the return air evaporator 25 .

[0077] Combination Figure 6 , Figure 7 As shown, the return air duct 30 includes a receiving chamber 34 for receiving the return air evaporator 25, a first return air duct 33 connecting the receiving chamber 34 and the return air inlet 31, and a second return air duct 35 connecting the receiving chamber 34 and the return air outlet 32. The return air duct 30 includes the first return air duct 33, the receiving chamber 34, and the second return air duct 35 in sequence from the return air inlet 31 to the return air outlet 32. The hot air flow in the refrigerating compartment 12 enters the first return air duct 33 and the receiving chamber 34 through the return air inlet 31 to exchange heat with the return air evaporator 25. The temperature of the air flow decreases after cooling, and then enters the freezing compartment 11 through the second return air duct 35 and the return air outlet 32.

[0078] The first return air duct 33 and the second return air duct 35 are staggered in the vertical direction and arranged at the openings at both ends of the accommodating chamber 34. This prevents the hot air flow in the refrigerating compartment 12 from directly entering the freezing compartment 11 without fully exchanging heat with the return air evaporator 25. By such an arrangement, the hot air flow in the refrigerating compartment 12 can fully exchange heat with the return air evaporator 25. This can reduce the temperature fluctuation of the freezing compartment 11 and reduce the frost on the freezing evaporator 24, thereby having the advantages of energy saving, high efficiency and high refrigeration efficiency.

[0079] Furthermore, the refrigerator further comprises a return air structure 3 for defining a return air duct 30. The return air structure 3 defines a return air duct 30 therein.

[0080] The return air structure 3 includes, from top to bottom, a first return air structure 36 for forming a first return air duct 33, a receiving structure 37 for forming a receiving chamber 34, and a second return air structure 38 for forming a second return air duct 35. The first return air structure 36 is provided with a return air inlet 31, and the second return air structure 38 is provided with a return air outlet 32. The first return air structure 36 is relatively fixed to the inner liner of the refrigerating compartment 12, and the second return air structure 38 is relatively fixed to the inner liner of the freezing compartment 11.

[0081] The containing structure 37 includes a vertical containing structure 371 connected to the first air return structure 36 , and a horizontal containing structure 373 connected to the second air return structure 38 and formed by lateral extension of the vertical containing structure 371 .

[0082] The return air evaporator 25 is fixed to the inner wall of the vertical accommodating structure 371. The vertical accommodating structure 371 defines a vertical accommodating chamber 341 for accommodating the return air evaporator 25. The horizontal accommodating structure 373 defines a horizontal accommodating chamber 342 communicating with the vertical accommodating chamber 341.

[0083] The hot air flow in the refrigerating compartment 12 enters the first return air duct 33 and the vertical receiving chamber 341 through the return air inlet 31 to exchange heat with the return air evaporator 25. After the air flow is cooled, the temperature is reduced, and then it enters the freezing compartment 11 through the horizontal receiving chamber 342, the second return air duct 35, and the return air outlet 32. The flow direction of the air flow has a vertical direction, a horizontal direction, and a vertical direction conversion flow, which can further ensure that the hot air flow in the refrigerating compartment 12 can fully exchange heat with the return air evaporator 25. In order to further reduce the temperature fluctuation of the freezing compartment 11, the frost of the freezing evaporator 24 can be reduced, and the advantages of energy saving, high efficiency and high refrigeration efficiency can be achieved.

[0084] Furthermore, the refrigerator further comprises a defrosting heating wire 4 arranged on the return air evaporator 25. The return air evaporator 25 is relatively small and is located in the return air duct 30, and has a high defrosting efficiency. Therefore, the defrosting heating wire 4 required by the return air evaporator 25 has a low power and a fast defrosting speed. Such an arrangement can improve the defrosting efficiency of the return air evaporator 25, reduce the defrosting power of the return air evaporator 25, and extend the defrosting cycle of the freezing evaporator 24.

[0085] The vertical receiving structure 371 defines a vertical receiving chamber 341 for receiving the return air evaporator 25. Preferably, the return air evaporator 25 is fixed to a side wall of the vertical receiving structure 371.

[0086] The bottom wall of the vertical accommodating structure 371 is recessed downward from the edge to the center, and a defrost drain pipe 5 connected to the vertical accommodating chamber 341 is provided at the center of the bottom wall of the vertical accommodating structure 371. The bottom wall of the vertical accommodating structure 371 forms a recessed surface 372, which forms a water receiving tray for defrosting water.

[0087] The return air evaporator 25 is arranged above the concave surface 372. The defrosting water generated by the return air evaporator 25 during defrosting flows through the concave surface 372 into the defrosting drain pipe 5 and is discharged from the return air duct 30. The structure is compact, and the defrosting and defrosting water discharge are convenient.

[0088] Furthermore, a compressor chamber for accommodating the compressor 21 is provided at the bottom of the box body 1, and an evaporating dish connected to the defrost drain pipe 5 is provided in the compressor chamber. The defrost water generated when the return air evaporator 25 is defrosted is guided to the defrost drain pipe 5 through the recessed surface 372 and flows into the evaporating dish.

[0089] Further, the horizontal receiving structure 373 defines a horizontal receiving chamber 342 that is in communication with the vertical receiving chamber 341 .

[0090] The top of the second return air structure 38 extends into the horizontal containing structure 373, and the top of the second return air structure 38 is higher than the bottom wall of the horizontal containing structure 373. This arrangement ensures that the defrosting water generated by the return air evaporator 25 during defrosting will not flow into the second return air structure 38, so as to avoid ice formation in the freezing compartment 11.

[0091] Furthermore, the bottom wall of the horizontal containment structure 373 is higher than the bottom wall of the vertical containment structure 371. A step is formed between the bottom wall of the horizontal containment structure 373 and the bottom wall of the vertical containment structure 371, which can further ensure that the defrosting water generated when the return air evaporator 25 is defrosted will not flow into the second return air structure 38, so as to avoid ice formation in the freezing compartment 11.

[0092] Furthermore, the bottom wall of the horizontal containment structure 373 is horizontally inclined downward in the direction away from the vertical containment structure 371 to the direction close to the vertical containment structure 371. Even if defrost water enters the horizontal containment chamber 342 of the horizontal containment structure 373, the defrost water will flow along the bottom wall of the horizontal containment structure 373 to the vertical containment chamber 341 and be discharged from the return air duct 30 through the defrost drain pipe 5. It can be further ensured that the defrost water generated when the return air evaporator 25 is defrosted will not flow into the second return air structure 38, so as to avoid ice formation in the freezing chamber 11.

[0093] Furthermore, the return air evaporator 25 includes a plurality of fin groups 251 spaced apart in the vertical direction.

[0094] The hot air flow in the refrigerated compartment 12 enters the first return air duct 33 and the vertical accommodating chamber 341 through the return air inlet 31 to exchange heat with the return air evaporator 25. The distribution direction of the fin group 251 is consistent with the flow direction of the hot air flow, so that the hot air flow can fully contact and exchange heat with the fins.

[0095] The fin group 251 includes a plurality of fins distributed in the horizontal direction, and the fins are extended in the vertical direction, so as to ensure that the hot air flow entering the vertical receiving chamber 341 can fully exchange heat with the fins, so as to improve the heat exchange efficiency of the return air evaporator 25, and has the advantages of energy saving, high efficiency and high refrigeration efficiency.

[0096] The present invention can be applied to other refrigeration equipment, such as refrigerators.

[0097] Compared with the prior art, the refrigerator provided by the present invention is provided with a freezing evaporator 24 and a fan in the freezing compartment 11, and an air outlet and a return air duct 30 connecting the refrigerating compartment 12 and the freezing compartment 11 are respectively provided. The fan guides at least part of the airflow after the freezing evaporator 24 is cooled to the refrigerating compartment 12 through the air outlet, thereby achieving the purpose of cooling and supplying air to the refrigerating compartment 12 of the single-system refrigerator, and the return air evaporator 25 provided in the return air duct 30 facilitates the heat exchange between the hot air flow in the refrigerating compartment 12 and the return air evaporator 25. After the airflow is cooled, the temperature is reduced and then enters the freezing compartment 11, which can avoid the freezing evaporator 24 from being too high in temperature and the freezing compartment 11 from having large temperature fluctuations, so as to reduce the frost of the freezing evaporator 24, so that the maximum frost cycle of the freezing evaporator 24 is longer and the defrosting time is shorter. The return air evaporator 25 is located in the return air duct 30, does not occupy the volume of the refrigerating compartment 12, and does not need to be provided with a refrigerating fan, so the cost is lower. It has the advantages of energy saving and high efficiency, high refrigeration efficiency, simple air duct structure, high space utilization and low cost.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A refrigerator, comprising a box body and a refrigeration system arranged in the box body, wherein a freezing compartment and a refrigerating compartment are defined in the box body, and the refrigeration system comprises a refrigeration circuit formed by a compressor, a condenser, a first throttling component, and a freezing evaporator connected in sequence through pipelines, characterized in that: The freezing evaporator is arranged in the freezing room, and a fan adjacent to the freezing evaporator is also arranged in the freezing room; The refrigerator further includes an air outlet duct and an air return duct respectively connecting the refrigerating compartment and the freezing compartment, and a return air evaporator disposed in the return air duct; Wherein, the return air evaporator can be selectively connected to the pipeline at the inlet end or the outlet end of the refrigeration evaporator.

2. The refrigerator according to claim 1, characterized in that: It also includes a first solenoid valve connected between the refrigeration evaporator and the return air evaporator, wherein the first solenoid valve has an inlet and two outlets; An inlet of the first solenoid valve is connected to the outlet of the refrigeration evaporator; The two outlets of the first solenoid valve are respectively connected to the inlet end of the return air evaporator and the inlet end of the compressor; Wherein, the outlet end of the return air evaporator is connected to the inlet end of the compressor.

3. The refrigerator according to claim 1, characterized in that: It also includes a second solenoid valve connected between the first throttling component and the return air evaporator, wherein the second solenoid valve has an inlet and two outlets; An inlet of the second solenoid valve is connected to an outlet end of the first throttling component; The two outlets of the second solenoid valve pass through the inlet end of the return air evaporator and the inlet end of the refrigeration evaporator respectively; Wherein, the outlet end of the return air evaporator is connected to the inlet end of the refrigeration evaporator through a pipeline.

4. The refrigerator according to claim 3, characterized in that: The refrigerator further includes a second throttling component connected between the outlet end of the return air evaporator and the inlet end of the freezing evaporator.

5. The refrigerator according to claim 1, characterized in that: The refrigerating compartment is arranged on the upper side of the freezing compartment; The return air duct is extended from top to bottom, and the two ends of the return air duct are respectively provided with a return air inlet and a return air outlet communicating with the refrigerating compartment and the freezing compartment, and the return air inlet is arranged above the return air outlet; Wherein, the return air evaporator is arranged in the middle area of ​​the return air duct.

6. The refrigerator according to claim 5, characterized in that: The return air duct includes a receiving chamber for receiving the return air evaporator, a first return air duct connecting the receiving chamber with the return air inlet, and a second return air duct connecting the receiving chamber with the return air outlet; Wherein, the first return air duct and the second return air duct are staggered in the vertical direction and arranged at two end openings of the accommodating chamber.

7. The refrigerator according to claim 6, characterized in that: Also included is a return air structure for defining the return air duct; The return air structure includes, from top to bottom, a first return air structure for forming the first return air duct, a receiving structure for forming the receiving chamber, and a second return air structure for forming the second return air duct; The containing structure comprises a vertical containing structure connected to the first air return structure, and a horizontal containing structure connected to the second air return structure formed by the lateral extension of the vertical containing structure; The return air evaporator is fixed on the inner wall of the vertical containing structure.

8. The refrigerator according to claim 7, characterized in that: It also includes a defrosting heating wire arranged on the return air evaporator; The vertical receiving structure defines a vertical receiving chamber for receiving the return air evaporator; The bottom wall of the vertical containing structure is recessed downward from the edge to the center, and a defrost drain pipe communicating with the vertical containing chamber is arranged at the center of the bottom wall of the vertical containing structure.

9. The refrigerator according to claim 7, characterized in that: The horizontal containing structure defines a horizontal containing chamber that communicates with the vertical containing chamber; The top of the second air return structure extends into the horizontal containing structure, and the top of the second air return structure is higher than the bottom wall of the horizontal containing structure; The bottom wall of the horizontal containing structure is higher than the bottom wall of the vertical containing structure, and the bottom wall of the horizontal containing structure is horizontally inclined downward in a direction from away from the vertical containing structure to close to the vertical containing structure.

10. The refrigerator according to claim 7, characterized in that: The return air evaporator comprises a plurality of fin groups spaced apart in a vertical direction, the fin group comprises a plurality of fins distributed in a horizontal direction, and the fins are extended in a vertical direction.

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