CN114543424A

CN114543424A - Refrigerator defrosting system, refrigerator and defrosting method

Info

Publication number: CN114543424A
Application number: CN202011331584.2A
Authority: CN
Inventors: 李伟
Original assignee: Hefei Hualing Co Ltd; Midea Group Co Ltd; Hefei Midea Refrigerator Co Ltd
Current assignee: Hefei Hualing Co Ltd; Midea Group Co Ltd; Hefei Midea Refrigerator Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2022-05-27

Abstract

The invention provides a refrigerator defrosting system, a refrigerator and a defrosting method, which relate to the technical field of refrigerators and comprise the following steps: a heat exchange member having a refrigerant heat exchange portion and an air heat exchange portion; the inlet end of the refrigerant heat exchange part is connected with a compressor, the outlet end of the refrigerant heat exchange part is connected with a capillary tube switching valve, the capillary tube switching valve is connected with at least 2 capillary tubes, each capillary tube is connected with 1 evaporator, and the evaporators are connected with the compressor to form a refrigeration loop; the outlet end of the air heat exchange part is connected with an air supply switching valve, the air supply switching valve is connected with at least 2 air supply pipelines, each air supply pipeline is communicated with 1 evaporation cabin provided with an evaporator, and each evaporation cabin is communicated with the inlet end of the air heat exchange part to form a defrosting loop; the defrosting loop absorbs heat generated by the refrigerant heat exchange part and is used for defrosting the evaporator. In the technical scheme, the refrigerator defrosting system can recycle heat generated in the system, and solves the defect of large defrosting energy consumption of the evaporator.

Description

Refrigerator defrosting system, refrigerator and defrosting method

Technical Field

The invention relates to the technical field of refrigerators, in particular to a refrigerator defrosting system, a refrigerator and a defrosting method.

Background

The refrigerator becomes an essential household appliance in daily life, a defrosting control program commonly used for the refrigerator is used for defrosting control according to temperature and time, after the freezing temperature of the refrigerator reaches a certain value, a compressor is directly controlled to stop working, a defrosting heater is directly started, and defrosting operation is carried out on an evaporator. However, the direct defrosting mode of the heater consumes much energy.

Disclosure of Invention

The invention aims to provide a defrosting system of a refrigerator, the refrigerator and a defrosting method, and aims to solve the technical problem that in the prior art, the defrosting energy consumption of the refrigerator is large.

The invention provides a defrosting system of a refrigerator, which comprises:

a heat exchange member having a refrigerant heat exchange portion and an air heat exchange portion;

the inlet end of the refrigerant heat exchanging part is connected with a compressor, the outlet end of the refrigerant heat exchanging part is connected with a capillary tube switching valve, the capillary tube switching valve is connected with at least 2 capillary tubes, each capillary tube is connected with 1 evaporator, and the evaporators are connected with the compressor to form a refrigeration loop;

the outlet end of the air heat exchange part is connected with an air supply switching valve, the air supply switching valve is connected with at least 2 air supply pipelines, each air supply pipeline is communicated with 1 evaporation cabin provided with the evaporator, and each evaporation cabin is communicated with the inlet end of the air heat exchange part to form a defrosting loop; wherein the defrosting circuit absorbs heat generated by the refrigerant heat exchanging part to defrost the evaporator.

Further, the heat exchange component is a double-channel heat exchanger, a first channel of the double-channel heat exchanger forms the refrigerant heat exchange portion, and a second channel of the double-channel heat exchanger forms the air heat exchange portion.

Further, the defrosting system of the refrigerator further includes:

the heat exchange component is a double-channel heat exchanger, the condenser is connected with the double-channel heat exchanger in parallel, a channel of the condenser and a first channel of the double-channel heat exchanger jointly form the refrigerant heat exchange part, and a second channel of the double-channel heat exchanger forms the air heat exchange part;

and the compressor is connected with the first flow channel of the double-flow-channel heat exchanger and the condenser through the condensation switching valve and 2 condensation pipelines.

Further, the heat exchange component comprises a condenser and an air heat exchanger, a flow channel of the condenser forms the refrigerant heat exchange portion, and a flow channel of the air heat exchanger forms the air heat exchange portion.

Further, the defrosting system of the refrigerator further includes:

and the outlet end of the air heat exchange part is connected with the air supply switching valve through the defrosting pipeline, wherein the defrosting pipeline is in heat conduction connection with the compressor to absorb heat generated by the compressor.

Further, the defrosting system of the refrigerator further includes:

and a dry filter connected between an outlet end of the refrigerant heat exchanging part and the capillary tube switching valve.

The invention also provides a refrigerator, which comprises at least 2 refrigerating compartments and the refrigerator defrosting system; the evaporation cabin is arranged in each refrigeration compartment, and a fan and the evaporator are arranged in the evaporation cabin; the evaporation cabin is provided with an air outlet and an air return inlet which are communicated with the refrigeration chamber.

Further, the refrigerator further includes:

an electric heater disposed within the evaporation compartment.

Further, the refrigerator further includes:

and the flow guide piece is arranged in the evaporation cabin and guides the gas of the defrosting loop to the evaporator.

Further, the refrigerator further includes:

and the pair of air doors are respectively arranged at the air outlet and the air return inlet.

Further, the refrigerator further includes:

the temperature sensor is arranged in the evaporation cabin, and the controller is in control connection with the temperature sensor, the compressor, the air door, the capillary tube switching valve and the air supply switching valve.

The invention also provides a defrosting method for the refrigerator, which is used for the refrigerator and comprises the following specific steps:

when a certain refrigeration chamber needs to be refrigerated, starting the compressor, controlling the capillary switching valve to switch to the capillary connected with the refrigeration chamber, and circularly supplying air along the refrigeration loop;

and when other refrigerating chambers need defrosting, closing the air outlet and the air return inlet of the refrigerating chamber, controlling the air supply switching valve to switch to an air supply pipeline connected with the refrigerating chamber, and circularly supplying air along the defrosting loop.

The invention also provides a defrosting method of the refrigerator, which comprises the following concrete steps:

when other refrigerating chambers need defrosting, closing an air outlet and an air return inlet of the refrigerating chamber, controlling the air supply switching valve to switch to an air supply pipeline connected with the refrigerating chamber, and circularly supplying air along the defrosting loop; and/or activating the electric heater.

Further, the electric heater is started, and when the operation reaches a first preset condition, the air supply switching valve is controlled to be switched to the corresponding evaporation cabin;

or controlling the air supply switching valve to switch to the corresponding evaporation cabin, and starting the electric heater when the operation reaches a second preset condition.

Further, the first preset condition is 5 to 15 minutes or the temperature in the evaporation cabin reaches 0 to 2 ℃; the second predetermined condition is 15 to 30 minutes or the temperature in the evaporation chamber reaches-5 to-1 ℃.

In the technical scheme, the refrigerator defrosting system can utilize the heat generated in the system to the defrosting process of the evaporator, and the energy is recycled, so that the defect of large energy consumption in the defrosting process of the evaporator is fundamentally overcome, and meanwhile, the defrosting efficiency can be effectively improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of a defrosting system of a refrigerator according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a defrosting system of a refrigerator according to another embodiment of the present invention;

fig. 3 is a schematic structural view of a defrosting system of a refrigerator according to still another embodiment of the present invention;

FIG. 4 is a schematic diagram of a refrigeration compartment provided by an embodiment of the present invention;

FIG. 5 is a schematic diagram of a circuit connection structure according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a working process of a defrosting system of a refrigerator according to an embodiment of the present invention.

Reference numerals: 1. a refrigeration circuit; 2. a defrosting circuit; 3. a refrigeration compartment; 11. a compressor; 12. a heat exchanger; 13. a capillary switching valve; 14. an evaporator; 15. a refrigeration circuit; 16. a capillary tube; 17. a condenser; 18. drying the filter; 19. a condensation switching valve; 110. a condensing pipeline; 21. an air supply switching valve; 22. a defrosting pipeline; 23. a supply air line; 31. an evaporation chamber; 32. an air outlet; 33. an air return opening; 34. a damper; 35. an electric heater; 36. a controller; 37. a temperature sensor.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides a defrosting system for a refrigerator, including a heat exchange unit having a refrigerant heat exchange portion and an air heat exchange portion; the inlet end of the refrigerant heat exchanging part is connected with a compressor 11, the outlet end of the refrigerant heat exchanging part is connected with a capillary tube switching valve 13, the capillary tube switching valve 13 is connected with at least 2 capillary tubes 16, each capillary tube 16 is connected with 1 evaporator 14, and the evaporators 14 are all connected with the compressor 11 to form a refrigeration loop; the outlet end of the air heat exchange part is connected with an air supply switching valve 21, the air supply switching valve 21 is connected with at least 2 air supply pipelines 23, each air supply pipeline 23 is communicated with 1 evaporation cabin 31 provided with the evaporator 14, and each evaporation cabin 31 is communicated with the inlet end of the air heat exchange part to form a defrosting loop; wherein the defrosting circuit absorbs heat generated by the refrigerant heat exchanging part to defrost the evaporator 14.

The heat exchange component is arranged to absorb heat of heat generating components such as the refrigerant heat exchange part and the compressor 11, and then heat the air by heat exchange, and the evaporator 14 is defrosted by the heated air. The heat exchange component in the application can adopt various structural forms, meanwhile, as for the application range of the refrigerator defrosting system, the refrigerator defrosting system can be applied to a single-system refrigerator or a multi-system refrigerator according to requirements, and a person skilled in the art can set a specific structural form and a specific applicable system according to requirements without limitation.

For example, the heat exchange component is a two-channel heat exchanger 12, a first channel of the two-channel heat exchanger 12 constitutes the refrigerant heat exchange portion, and a second channel of the two-channel heat exchanger 12 constitutes the air heat exchange portion. The condenser 17 may be additionally provided, the condenser 17 is connected in parallel with the two-channel heat exchanger 12, a channel of the condenser 17 and the first channel form the refrigerant heat exchanging portion, a condensation switching valve is additionally provided, and the compressor 11 is connected with the air heat exchanger 12 and the condenser 17 through the condensation switching valve and 2 condensation pipelines.

Or, the heat exchange component may further include a condenser 17 and an air heat exchanger 12, a flow channel of the condenser 17 constitutes the refrigerant heat exchange portion, and a flow channel of the air heat exchanger 12 constitutes the air heat exchange portion, so that the condenser 17 and the air heat exchanger 12 constitute the heat exchange component.

For example, referring to fig. 1, when the refrigerator defrost system is adapted to be used in a multi-system refrigerator, i.e. when there are two refrigeration circuits 1 for different refrigeration compartments 3 in the refrigerator. In this case, the refrigerator defrosting system can switch the flow paths of the refrigerating circuit 1 and the defrosting circuit 2 by the capillary tube switching valve 13 and the air blow switching valve 32, even if the outlet end of the refrigerant heat exchanging part is connected to at least 2 capillary tubes 16 through the capillary tube switching valve, and the outlet end of the air heat exchanging part is connected to at least 2 air blow lines 23 through the air blow switching valve 21.

The first flow channel, the compressor 11 and the capillary switching valve 13 may be connected in series through a refrigeration pipeline 15, and the outlet end of the second flow channel may be connected to the compressor 11 through a defrosting pipeline 22 in a heat conducting manner, so that heat exchange is performed by contact between the defrosting pipeline 22 and the compressor 11. When the number of the evaporators 14 is 2, 2 evaporators 14 are connected in parallel; or, when there are 3 evaporators 14, the 3 evaporators 14 are connected in series and in parallel.

Therefore, aiming at the problem of high energy consumption in the defrosting process of the evaporator 14 in the prior art, the defrosting system of the refrigerator can utilize the heat generated in the system in the defrosting process of the evaporator 14 and recycle the energy, so that the defect of high defrosting energy consumption of the evaporator 14 is fundamentally solved, and meanwhile, the defrosting efficiency is effectively improved.

Specifically, taking the system structure shown in fig. 1 as an example, the refrigerator defrosting system is additionally provided with a separate defrosting circuit 2 on the internal system structure, and the defrosting circuit 2 is composed of a defrosting pipeline 22, an air supply switching valve 21 and a plurality of air supply pipelines 23, where the defrosting pipeline 22 may form a heat conduction connection with a component or device capable of generating heat when arranged inside the system, and the heat conduction connection may be a mutual winding thermal contact manner or an integrally formed thermal contact manner, and the specific form is not limited herein, and those skilled in the art may perform targeted arrangement according to requirements.

Therefore, when the defrosting pipeline 22 absorbs the heat generated by the relevant parts and devices, the temperature of the air in the defrosting pipeline 22 can be raised, the air after the temperature rise enters the evaporation chamber 31 along the corresponding air supply pipeline 23, and the evaporator 14 in the evaporation chamber 31 is subjected to defrosting treatment, so that the aim of defrosting the evaporator 14 by the energy generated by the system can be fulfilled.

The devices matched with the defrosting pipeline 22 and connected in a heat conduction mode can be the compressor 11, the condenser 17 and the like of the refrigerator, in addition, a person skilled in the art can absorb heat of other parts or devices according to requirements to achieve defrosting of the evaporator 14, therefore, the defrosting mode of defrosting the frost layer of the evaporator 14 by adopting the heat generated by the person can effectively reduce energy consumption, reduce energy consumed by heating modes such as electric heating and the like, and further achieve the purpose of reducing the energy consumption integrally.

As can be seen from fig. 1, when the refrigerator defrosting system performs a defrosting operation specifically, the refrigeration circuit 1 and the defrosting circuit 2 are required to be matched with each other, the refrigeration circuit 1 includes a compressor 11, a heat exchanger 12, a capillary switching valve 13, and at least two evaporators 14, which are communicated with each other, the heat exchanger 12 has a first flow passage and a second flow passage, which are independent, and the first flow passage and the second flow passage can be connected to the refrigeration circuit 1 and the defrosting circuit 2, respectively, to perform auxiliary refrigeration and defrosting functions.

Therefore, in the defrosting system of the refrigerator of this embodiment, the refrigerator needs at least two refrigeration compartments 3, the two refrigeration compartments 3 are respectively provided with the independent evaporation chambers 31, the independent evaporators 14 are arranged in the evaporation chambers 31, when the evaporator 14 in one of the refrigeration compartments 3 performs the cooling operation, the compressor 11 will operate and generate heat, and meanwhile, if the other refrigeration compartments 3 need the defrosting operation, the second flow passage of the defrosting circuit 2 can absorb the heat of the compressor 11, so as to defrost the evaporator 14 needing defrosting.

According to the connection structure shown in fig. 1, different evaporators 14 in different refrigeration compartments 3 can be connected in series with the compressor 11, the first flow channel and the capillary tube switching valve 13 in sequence through a refrigeration pipeline 15, and then the capillary tube switching valve 13 is connected with the other ends of different evaporators 14 through at least two capillary tubes 16. At this time, when a refrigeration operation is required for one of the refrigeration compartments 3, the compressor 11 may be started to allow the refrigerant to flow from the compressor 11 to the capillary tube switching valve 13 along the first flow path, and the refrigerant is caused to flow to the different evaporators 14 according to the switching states of the capillary tube switching valve 13, so that the evaporators 14 perform the refrigeration operation for the refrigeration compartment 3 in which the refrigerant is located.

The inside of the refrigeration compartment 3 is provided with an evaporation cabin 31 which can be independently used for arranging the evaporator 14, the evaporation cabin 31 is provided with an air outlet 32 and an air return opening 33, the air outlet 32 and the air return opening 33 are both communicated with the refrigeration compartment 3, so that a circulating air flow channel is formed between the refrigeration compartment 3 and the evaporation cabin 31 through the air outlet 32 and the air return opening 33, a fan matched with the evaporator 14 is arranged in the evaporation cabin 31, when the evaporator 14 is used for refrigerating, the fan can be matched and started, cold air is circularly guided between the refrigeration compartment 3 and the evaporation cabin 31, the refrigeration compartment 3 is refrigerated, and food in the refrigeration compartment 3 can be effectively refrigerated and can exchange heat with the inner space of the refrigeration compartment 3.

In the above-mentioned refrigeration process, the refrigerant will flow to the heat exchanger 12 after being compressed by the compressor 11, and is cooled by the first flow channel of the heat exchanger 12, and the cooled refrigerant will flow through the capillary tube switching valve 13, and when the corresponding refrigeration compartment 3 needs to be refrigerated, the capillary tube switching valve 13 can communicate with the capillary tube 16 connected to the refrigeration compartment 3, so that the cooled refrigerant flows into the corresponding refrigeration compartment 3 through the capillary tube 16, enters the evaporation chamber 31 arranged in the refrigeration compartment 3, flows through the inlet of the evaporator 14 connected to the capillary tube 16, and then flows out through the outlet of the evaporator 14, and returns to the inlet of the compressor 11, thereby completing a cycle, and thus achieving refrigeration of any compartment of the refrigerator in the past. During the circulation process, the evaporator 14 can continuously perform the refrigeration work, and the refrigeration compartment 3 is refrigerated by matching with the flow guiding function of the fan. During the cooling operation of one of the compartments 3, the compressor 11 generates a large amount of heat, which is the energy that can be used directly for defrosting the evaporator 14 in the refrigerator defrosting system.

Meanwhile, as shown in fig. 1, the defrosting circuit 2 is formed by a defrosting pipe 22, an air supply switching valve 21 and a plurality of air supply pipes 23, one end of the air supply switching valve 21 is connected in series with the second flow passage through the defrosting pipe 22, and the other end of the air supply switching valve 21 is connected with at least two air supply pipes 23, so that the plurality of evaporation chambers 31 in the plurality of refrigeration compartments 3 can be communicated by the connection and cooperation of the defrosting pipe 22 with the air supply switching valve 21 and the plurality of air supply pipes 23, and separate circulation passages are formed between the evaporation chambers 31 and the second flow passage of the heat exchanger 12 through different air supply pipes 23. When the evaporator 14 needs to be defrosted in another refrigerating compartment 3, the air inlet and the air return opening 33 of the evaporating compartment 31 in the refrigerating compartment 3 needing defrosting can be firstly closed, so that the original refrigerating and air return circulation is cut off between the evaporating compartment 31 and the refrigerating compartment 3 where the evaporating compartment 31 is located, the defrosting circuit 2 and the evaporating compartment 31 can form an independent circulation circuit, and at the moment, the air supply switching valve 21 is switched to the air supply pipeline 23 connected with the evaporating compartment 31, so that the defrosting circuit 2 and the evaporating compartment 31 form an independent circulation circuit.

Therefore, after the partial section of the defrosting pipeline 22 in the defrosting circuit 2 is contacted with the compressor 11, the contacted partial section can exchange heat with the compressor 11 to absorb the heat generated by the compressor 11, so that the temperature of the air in the defrosting pipeline 22 is increased to reach the temperature enough for defrosting. Meanwhile, the fan in the evaporation chamber 31 is started to form a flow guiding effect, so that the air in the defrosting loop 2 circularly flows along the defrosting loop 2, the air in the defrosting loop 2 circularly enters the evaporation chamber 31 and continuously flows through the evaporator 14 in the evaporation chamber 31, and a frost layer on the surface of the evaporator 14 is subjected to defrosting treatment, so that circulating defrosting of the evaporator 14 can be formed, and the flow guiding of the air in the defrosting loop 2 can be stopped until a defrosting condition is reached.

It should be noted that, when defrosting the evaporator 14 in one of the refrigeration compartments 3, the defrosting circuit 2 needs to perform the refrigeration operation in the other refrigeration compartments 3 at the same time, because the compressor 11 in the refrigerator generates heat only when the other refrigeration compartments 3 perform the refrigeration operation at the same time, and the defrosting can be performed by using the heat. Of course, besides, those skilled in the art can also use the heat absorbed by other components or devices to complete the defrosting operation of the evaporator 14, and adjust the working phase of the defrosting circuit 2 according to the condition of heat generation, which will not be described herein again.

With continuing reference to the configuration shown in fig. 2, this embodiment adds a condensation switching valve 19 to the configuration shown in fig. 1, and the compressor 11 is connected to the air heat exchanger 12 and the condenser 17 through the

condensation switching valve

19 and 2 condensation lines 110. The refrigerator defrosting system further includes a condenser 17, the condenser 17 being connected in parallel with the heat exchanger 12 between the compressor 11 and the capillary switching valve 13, wherein at least a portion of the defrosting pipe 22 may be thermally connected to the condenser 17. The refrigerator defrosting system further includes a condensation switching valve 19, and the compressor 11 is connected to the condenser 17 and the heat exchanger 12 through the

condensation switching valve

19 and 2 condensation lines 110. At this time, in the defrosting system of the refrigerator provided in this embodiment, the condenser 17 is added, and the condenser 17 can be used for cooling operation as with the heat exchanger 12, and by the synchronous operation of the condenser 17 and the heat exchanger 12, the cooling effect and the cooling rate of the refrigerant can be enhanced, and the cooling rate in the cooling compartment 3 can be increased. Meanwhile, in order to cooperate with the switching operation between the heat exchanger 12 and the condenser 17, the compressor 11 is further connected with the condenser 17 and the heat exchanger 12 through a

condensation switching valve

19 and 2 condensation pipelines 110, and the compressor 11 is communicated with the condenser 17 or the heat exchanger 12 according to the actual refrigeration requirement of a certain refrigeration compartment 3 so as to meet the actual refrigeration requirement.

Since the refrigeration effect of the condenser 17 is stronger than that of the simple heat exchanger 12, as shown in fig. 2, in the defrosting system of the refrigerator provided in this embodiment, when one of the refrigeration compartments 3 needs defrosting, the refrigeration requirement of the refrigeration compartment 3 can be first determined, and when the actual refrigeration requirement of the refrigeration compartment 3 is larger, the condensation switching valve 19 can be switched to the condensation pipeline 110 connecting the compressor 11 and the condenser 17, at this time, the refrigerant will flow to the condenser 17 after being compressed by the compressor 11, and is cooled by the condenser 17, and the cooled refrigerant will pass through the capillary switching valve 13.

When the refrigeration of the corresponding refrigeration compartment 3 is needed, the capillary switching valve 13 may communicate with the capillary 16 connected to the refrigeration compartment 3, so that the cooled refrigerant flows into the corresponding refrigeration compartment 3 through the capillary 16, enters the evaporation chamber 31 arranged in the refrigeration compartment 3, flows through the inlet of the evaporator 14 connected to the capillary 16, then flows out through the outlet of the evaporator 14, and returns to the inlet of the compressor 11, thereby completing a cycle, and thus achieving refrigeration of any compartment of the refrigerator in the past. Therefore, the condenser 17 is adopted for auxiliary cooling, so that the condensation effect can be effectively enhanced.

Of course, if the refrigeration demand of the refrigeration compartment 3 is not high, the condensation switching valve 19 may be switched to the condensation line 110 connecting between the compressor 11 and the heat exchanger 12, at this time, the refrigerant will flow to the first flow channel of the heat exchanger 12 after being compressed by the compressor 11, and the refrigerant is cooled by the first flow channel, and the cooled refrigerant will enter the corresponding evaporator 14 through the capillary tube 16 for refrigeration. The working state between the condenser 17 and the heat exchanger 12 can be switched by those skilled in the art according to the requirement, and is not limited herein. Meanwhile, for the actual refrigeration requirement of a certain refrigeration compartment 3, the actual temperature in the refrigeration compartment 3 can be detected and analyzed by a temperature detection component such as a sensor, and the like, and the actual temperature is obtained without limitation.

Similarly, in the circulation process, as shown in fig. 2, the defrosting circuit 2 is still formed by the defrosting pipeline 22, the air supply switching valve 21 and the air supply pipelines 23, when the evaporator 14 needs to be defrosted by another refrigerating compartment 3, the air inlet and the air return opening 33 of the evaporating compartment 31 in the refrigerating compartment 3 needing defrosting can be firstly closed, so that the original refrigerating and air return circulation is cut off between the evaporating compartment 31 and the refrigerating compartment 3 where the evaporating compartment 31 is located, and the defrosting circuit 2 and the evaporating compartment 31 can form an independent circulation circuit, at this time, the air supply switching valve 21 is switched to the air supply pipeline 23 connected with the evaporating compartment 31, so that the defrosting circuit 2 and the evaporating compartment 31 form an independent circulation circuit. Therefore, after the partial section of the defrosting pipeline 22 in the defrosting circuit 2 is contacted with the compressor 11, the contacted partial section can exchange heat with the compressor 11 to absorb the heat generated by the compressor 11, so that the temperature of the air in the defrosting pipeline 22 is increased to reach the temperature enough for defrosting.

With continued reference to the structure shown in fig. 3, the heat exchange part includes a condenser 17 and an air heat exchanger 12, the flow passage of the condenser 17 constitutes the refrigerant heat exchange portion, and the flow passage of the air heat exchanger 12 constitutes the air heat exchange portion, so that the heat exchange part is constituted by the condenser 17 and the air heat exchanger 12. The refrigerator defrosting system provided by this embodiment adopts a condenser 17 and a heat exchanger 12 with a single channel to respectively realize the operations of refrigeration and defrosting, wherein one end of the evaporator 14 is connected with the compressor 11, the condenser 17 and the capillary tube switching valve 13 in series through a refrigeration pipeline 15, and the capillary tube switching valve 13 is connected with the other end of the evaporator 14 through at least two capillary tubes 16, so that the compressor 11 is communicated with the condenser 17, the capillary tube switching valve 13 and the evaporator 14 separately to form a circulation channel for refrigeration. One end of the air supply switching valve 21 is connected in series with one end of the heat exchanger 12 through a defrosting pipeline 22, the other end of the air supply switching valve 21 is connected with at least two air supply pipelines 23, the heat exchanger 12 and the air supply pipelines 23 are used for being connected with an evaporation cabin 31 of the evaporator 14, and the heat exchanger 12 is independently communicated with the air supply switching valve 21 and the evaporation cabin 31 to form a circulation channel for defrosting.

As shown in fig. 3, when a certain refrigeration compartment 3 needs to be refrigerated, the compressor 11 may be started, so that the refrigerant flows to the heat exchanger 12 after being compressed by the compressor 11, the refrigerant is cooled by the heat exchanger 12, the cooled refrigerant passes through the capillary tube switching valve 13, the capillary tube switching valve 13 may be communicated with the capillary tube 16 connected to the refrigeration compartment 3, so that the cooled refrigerant flows to the corresponding refrigeration compartment 3 through the capillary tube 16, enters the evaporation compartment 31 provided in the refrigeration compartment 3, flows through the inlet of the evaporator 14 connected to the capillary tube 16, and then flows out through the outlet of the evaporator 14 to return to the inlet of the compressor 11, thereby completing a cycle, and thus, the refrigeration of the refrigeration compartment 3 is realized.

In the circulation process, the evaporator 14 can continuously perform refrigeration work, because the evaporation cabin 31 which can be independently used for arranging the evaporator 14 is arranged in the refrigeration chamber 3, the evaporation cabin 31 is provided with the air outlet 32 and the air return opening 33, a circulating air flow channel can be formed between the refrigeration chamber 3 and the evaporation cabin 31 through the air outlet 32 and the air return opening 33, a fan matched with the evaporator 14 is arranged in the evaporation cabin 31, when the evaporator 14 performs refrigeration, the fan can be matched and started, cold air is circularly guided between the refrigeration chamber 3 and the evaporation cabin 31, the refrigeration chamber 3 is refrigerated, and food in the refrigeration chamber 3 can be effectively refrigerated and can exchange heat with the inner space of the refrigeration chamber 3. During the cooling operation of the cooling compartment 3, the compressor 11 can generate a large amount of heat, which is the energy that can be directly used for defrosting the evaporator 14 in the refrigerator defrosting system.

As shown in fig. 3, the defrosting circuit 2 may be formed by a defrosting pipe 22, an air supply switching valve 21 and a plurality of air supply pipes 23, wherein one end of the air supply switching valve 21 is connected in series with the second flow passage through the defrosting pipe 22, and the other end of the air supply switching valve 21 is connected to at least two air supply pipes 23, so that the plurality of evaporation chambers 31 in the plurality of refrigeration compartments 3 may be communicated by the connection between the defrosting pipe 22 and the air supply switching valve 21 and the plurality of air supply pipes 23, and a separate circulation passage may be formed between the evaporation chambers 31 and the heat exchanger 12 by the different air supply pipes 23. When the evaporator 14 needs to be defrosted in another refrigeration compartment 3, the air inlet and the air return opening 33 of the evaporation chamber 31 in the refrigeration compartment 3 needing defrosting can be closed first, so that the original refrigeration air return circulation is cut off between the evaporation chamber 31 and the refrigeration compartment 3 where the evaporation chamber 31 is located, and the defrosting circuit 2 and the evaporation chamber 31 can form an independent circulation circuit, and at the moment, the air supply switching valve 21 is switched to the air supply pipeline 23 connected with the evaporation chamber 31, so that the defrosting circuit 2 and the evaporation chamber 31 form an independent circulation circuit.

Therefore, after the partial section of the defrosting pipeline 22 in the defrosting circuit 2 is contacted with the compressor 11, the contacted partial section can exchange heat with the compressor 11 to absorb the heat generated by the compressor 11, so that the temperature of the air in the defrosting pipeline 22 is increased to reach the temperature enough for defrosting. Meanwhile, the fan in the evaporation chamber 31 is started to form a flow guide effect, so that air in the defrosting loop 2 can circularly flow along the defrosting loop 2, the air in the defrosting loop 2 circularly enters the evaporation chamber 31 and continuously flows through the evaporator 14 in the evaporation chamber 31, and a frost layer on the surface of the evaporator 14 is subjected to defrosting treatment, so that circulating defrosting of the evaporator 14 can be formed until a defrosting condition is reached, and the flow guide of the air in the defrosting loop 2 is stopped.

Referring to fig. 1 to 3, the refrigerator defrosting systems may each include a dry filter 18, and the dry filter 18 is connected between an outlet end of the refrigerant heat exchanging part and the capillary tube 16. At this time, after the refrigerant passing through the condenser 17 or the heat exchanger 12 is cooled, it may continue to pass through the dry filter 18 and then pass through the capillary tube switching valve 13 into a predetermined capillary tube 16, and a refrigeration cycle is formed in a predetermined evaporator 14.

Referring to fig. 4 and 5, the present invention also provides a refrigerator comprising at least 2 refrigerating compartments 3 and the refrigerator defrosting system; the evaporation cabin 31 is arranged in the refrigeration compartment 3, and a fan and the evaporator 14 are arranged in the evaporation cabin 31; the evaporation cabin 31 is provided with an air outlet 32 and an air return opening 33 which are communicated with the refrigeration compartment 3.

In fig. 4, which shows the internal structure of one of the refrigeration compartments 3, when the air outlet 32 and the air return 33 are opened, a circulating refrigeration channel can be formed between the refrigeration compartment 3 and the evaporation chamber 31 inside the refrigeration compartment, and when the air outlet 32 and the air return 33 are closed, the defrosting circuit 2 and the corresponding evaporation chamber 31 can form a circulating defrosting channel. In order to control the opening and closing of the air outlet 32 and the air return opening 33, a pair of dampers 34 may be respectively disposed at the air outlet 32 and the air return opening 33, so as to control the opening and closing of the dampers 34. Since the specific structure, functional principle and technical effect of the defrosting system of the refrigerator are all detailed in the foregoing, detailed description is omitted here.

With continued reference to fig. 4 and 5, the refrigerator further includes an electric heater 35, and the electric heater 35 is disposed in the evaporation compartment 31. At this time, the electric heater 35 may be used to assist the defrosting operation of the refrigerator defrosting system. Referring to fig. 6, during the defrosting operation, it can be determined whether the electric heater 35 is installed in the refrigerator, and when the electric heater 35 is installed, the electric heater 35 is first used for defrosting and then the defrosting circuit 2 is used for defrosting until the defrosting is finished within a predetermined time when the defrosting is required in the refrigerating compartment 3. Or when the refrigerating compartment 3 needs defrosting, the defrosting circuit 2 is firstly adopted to defrost within the first preset time, and then the electric heater 35 is adopted to defrost until defrosting is finished.

Meanwhile, the refrigerator further comprises a flow guide member, which is arranged in the evaporation chamber 31 and guides the gas of the defrosting circuit to the evaporator 14. After the heated air in the defrosting loop 2 enters the evaporation cabin 31, the air can be directly guided to the evaporator 14 through the guide piece, so that the defrosting of a frost layer can be further improved through the impact force of the air flow, and the defrosting effect is improved.

As shown in fig. 5, the refrigerator further includes a controller 36 and a temperature sensor 37, the temperature sensor 37 is disposed in the evaporation chamber 31, and the controller 36 is in control connection with the temperature sensor 37, the compressor 11 and the damper 34. In other embodiments, the controller 36 may also be in control connection with the temperature sensor 37, the compressor 11, the damper 34, the capillary tube switching valve 13, and the supply air switching valve 21.

Therefore, the temperature sensor 37 can detect the real-time temperature in the evaporation chamber 31 for determining whether the defrosting of the evaporator 14 meets the preset condition, and further determining whether the defrosting operation of the defrosting circuit 2 or the electric heater 35 is finished. In the whole control system, the controller 36 can control the opening and closing of the damper 34 according to a preset program and the detection result of the temperature sensor 37, so as to adjust the switching of the refrigeration operation and the defrosting operation of the corresponding refrigeration compartment 3, and control the cooperation among the compressor 11, the capillary tube switching valve 13 and the air supply switching valve 21, which can be referred to in the foregoing refrigeration and defrosting process.

The invention also provides a defrosting method of the refrigerator, which comprises the following concrete steps: when judging that a certain refrigeration chamber 3 needs to be refrigerated, starting the compressor 11, controlling the capillary switching valve 13 to be switched to the capillary 16 connected with the refrigeration chamber 3, and circularly supplying air along the refrigeration loop 1; when it is determined that the other refrigerating compartments 3 need defrosting, the air outlet 32 and the air return opening 33 of the refrigerating compartment 3 are closed, the air supply switching valve 21 is controlled to switch to the air supply pipeline 23 connected to the refrigerating compartment 3, and air is circulated along the defrosting circuit 22.

Referring to fig. 6, when a refrigerator provided with a refrigerator defrosting system performs cooling and defrosting operations, taking the embodiment shown in fig. 2 as an example, in the cooling operation process of the refrigerator, a refrigerant compressed by a compressor 11 flows through a capillary switching valve 13, the capillary switching valve 13 is switched to a corresponding capillary 16, so that the refrigerant can enter an evaporator 14 in a first cooling compartment 3 through the capillary 16 and then returns to the compressor 11 through the evaporator 14 to complete a refrigerant cycle, and when a shutdown point of the first cooling compartment 3 is reached, the refrigerant can be switched to a second cooling compartment 3 to continue cooling operation of the second cooling compartment 3.

At this time, when the second refrigeration compartment 3 needs defrosting, the air supply switching valve 21 may switch to the air supply pipeline 23 connected to the second refrigeration compartment 3, at this time, the air inlet and the air return opening 33 of the second refrigeration compartment 3 are controlled to be closed, the fan starts to circulate and guide air in the defrosting circuit 2, the air in the defrosting circuit 2 absorbs heat after passing through the condenser 17 and the compressor 11, so that the air in the defrosting circuit 2 is heated, enters the evaporation chamber 31 to defrost the evaporator 14, the temperature of the air is reduced after exchanging heat with the evaporator 14, the air is circulated and discharged along the defrosting circuit 2, and the circulation is repeated until the defrosting condition is met.

In the defrosting air circulation process, after the air passes through the heat exchanger 12, the condenser 17 and the compressor 11, the temperature of the air can generally reach more than 45 ℃, the air is sufficient for defrosting the evaporator 14, and under the forced convection action of the fan, compared with electric heating or natural convection defrosting, the defrosting efficiency can be greatly improved, and the defrosting time is effectively shortened. The return air temperature of the air after heat exchange can reach below 20 ℃ on average, and the air can well cool the components after returning to the heat exchanger 12, the condenser 17 and the compressor 11, so that the efficiency of the whole refrigerating system is optimized.

The invention also provides a defrosting method of the refrigerator, which comprises the following concrete steps: when judging that a certain refrigeration chamber 3 needs to be refrigerated, starting the compressor 11, controlling the capillary switching valve 13 to be switched to the capillary 16 connected with the refrigeration chamber 3, and circularly supplying air along the refrigeration loop 1; when it is determined that the other refrigerating compartments 3 need defrosting, the air outlet 32 and the air return opening 33 of the refrigerating compartment 3 are closed, the air supply switching valve 21 is controlled to switch to the air supply pipeline 23 connected to the refrigerating compartment 3, and air is circulated along the defrosting circuit 22. Or the electric heater 35 may also be activated. At this time, as shown in fig. 6, if the electric heater 35 is incorporated, the defrosting operation of the evaporator 14 can be realized by combining the defrosting circuit 2 and the electric heater 35 according to actual requirements.

In one embodiment, when defrosting of the evaporator 14 is required, the electric heater 35 may be first activated, and when the operation reaches a first preset condition, the air supply switching valve 21 is controlled to switch to the corresponding evaporation chamber 31, air is circulated along the defrosting circuit 22, and defrosting continues to be performed by using the defrosting circuit 2 in cooperation with the electric heater 35. Or, the air supply switching valve 21 may be first controlled to switch to the corresponding evaporation chamber 31, air is circulated along the defrosting circuit 22, defrosting is performed in advance by using the defrosting circuit 2, and when the operation reaches a second preset condition, the electric heater 35 is started to cooperate with the defrosting circuit 2 to defrost. Wherein the first preset condition can be set to 5 to 15 minutes or the temperature in the evaporation compartment 31 reaches 0 to 2 ℃; the second preset condition may be set to 15 to 30 minutes or the temperature in the evaporation chamber 31 reaches-5 to-1 ℃.

Therefore, in one case, the electric heater 35 may be first activated, and when the operation lasts for 5 to 15 minutes or the temperature in the evaporation chamber 31 reaches 0 to 2 ℃, the blowing switching valve 21 may be controlled to switch to the corresponding evaporation chamber 31, and the defrosting circuit 2 may be continuously used in cooperation with the electric heater 35 to defrost. Or, the air supply switching valve 21 may be first controlled to switch to the corresponding evaporation chamber 31, the defrosting circuit 2 is adopted to defrost in advance, and the electric heater 35 is started to cooperate with the defrosting circuit 2 to defrost after the operation is carried out for 15 to 30 minutes or the temperature in the evaporation chamber 31 reaches-5 to-1 ℃.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A defrost system for a refrigerator, comprising:

2. The defrosting system for a refrigerator of claim 1 wherein the heat exchange member is a two-pass heat exchanger, a first pass of the two-pass heat exchanger constituting the refrigerant heat exchanging portion, and a second pass of the two-pass heat exchanger constituting the air heat exchanging portion.

3. The defrosting system for a refrigerator of claim 1, further comprising:

4. The defrosting system for a refrigerator of claim 1, wherein the heat exchanging part comprises a condenser and an air heat exchanger, the flow passage of the condenser constitutes the refrigerant heat exchanging part, and the flow passage of the air heat exchanger constitutes the air heat exchanging part.

5. The refrigerator defrost system of any one of claims 1-4, further comprising:

6. The refrigerator defrost system of any one of claims 1-4, further comprising:

7. A refrigerator comprising at least 2 refrigeration compartments and a refrigerator defrost system as claimed in any one of claims 1-6; the evaporation cabin is arranged in each refrigeration compartment, and a fan and the evaporator are arranged in the evaporation cabin; the evaporation cabin is provided with an air outlet and an air return inlet which are communicated with the refrigeration chamber.

8. The refrigerator according to claim 7, further comprising:

an electric heater disposed within the evaporation compartment.

9. The refrigerator according to claim 7 or 8, further comprising:

the flow guide piece is arranged in the evaporation cabin and guides the gas of the defrosting loop to the evaporator.

10. The refrigerator according to claim 7 or 8, further comprising:

11. The refrigerator according to claim 10, further comprising:

the temperature sensor is arranged in the evaporation cabin, and the controller is in control connection with the temperature sensor, the compressor, the air door, the capillary switching valve and the air supply switching valve.

12. A method for defrosting a refrigerator, which is used for the refrigerator according to any one of claims 7 to 11, and comprises the following steps:

13. A method for defrosting a refrigerator, according to the refrigerator of claim 8, comprising the steps of:

when other refrigerating chambers need defrosting, closing the air outlet and the air return inlet of the refrigerating chamber, controlling the air supply switching valve to switch to an air supply pipeline connected with the refrigerating chamber, and circularly supplying air along the defrosting loop; and/or activating the electric heater.

14. The defrosting method for a refrigerator according to claim 13, wherein the electric heater is activated, and when the operation reaches a first preset condition, the blowing switching valve is controlled to switch to the corresponding evaporation chamber;

15. The defrosting method for a refrigerator according to claim 14, wherein the first preset condition is 5 to 15 minutes or the temperature in the evaporation compartment reaches 0 to 2 ℃; the second predetermined condition is 15 to 30 minutes or the temperature in the evaporation chamber reaches-5 to-1 ℃.