CN115540463A - Refrigerator with defrosting function - Google Patents

Abstract

The invention discloses a refrigerator with defrosting function, comprising: the system comprises a composite condenser, a refrigeration loop, a defrosting loop and a control valve group. The composite condenser comprises a condensation channel and an evaporation channel; the refrigeration loop comprises a compressor, a condensation channel, a refrigeration pressure reducing component and an evaporator which are sequentially communicated end to end; the defrosting loop comprises a compressor, an evaporator, a defrosting depressurization component and an evaporation channel which are sequentially communicated end to end; the control valve block is configured to control the refrigerant to selectively circulate in the refrigeration circuit or the defrost circuit. The composite condenser is configured such that heat energy generated during circulation of the refrigerant in the refrigeration circuit can be absorbed by the refrigerant circulating in the defrost circuit. The refrigerator can defrost the evaporator by the aid of the composite condenser, and can fully utilize heat generated in the refrigeration loop and cold generated in the defrosting loop by the condensation channel and the evaporation channel on the composite condenser.

Description

Refrigerator with defrosting function

Technical Field

The invention belongs to the technical field of refrigeration equipment, and particularly provides a refrigerator with a defrosting function.

Background

With the continuous development of society, refrigerators have become an indispensable household appliance for most families as refrigeration equipment for refrigerating and freezing food materials. Existing refrigerators generally have a refrigeration system that generally includes a compressor, a condenser, a refrigerant pressure reducing member (e.g., a capillary tube), and an evaporator in serial end-to-end communication.

In the process of long-term use of the existing refrigerator, the evaporator as a refrigerating element is often frosted. The frost on the surface of the evaporator can reduce the refrigeration effect of the evaporator, so that the temperature rise of the refrigeration chamber is caused, the freezing or refrigerating effect of food materials is influenced, and the energy consumption of the refrigerator is easily increased. Therefore, defrosting of the evaporator is required.

Disclosure of Invention

In order to solve the above problems in the prior art, an object of the present invention is to provide a refrigerator having a defrosting function to defrost an evaporator of a parallel refrigerator through a composite condenser of the refrigerator.

A further object of the present invention is to rapidly defrost an evaporator by sufficiently absorbing heat generated from a composite condenser in a refrigerating stage of a refrigerator.

To achieve the above object, the present invention provides a refrigerator having a defrosting function, comprising:

a compound condenser comprising a condensing channel and an evaporating channel;

the refrigeration loop comprises a compressor, the condensation channel, a refrigeration pressure reduction component and an evaporator which are sequentially communicated end to end;

the defrosting loop comprises the compressor, the evaporator, a defrosting depressurization component and the evaporation channel which are sequentially communicated end to end;

a control valve block configured to control refrigerant to selectively circulate in the refrigeration circuit or the defrost circuit;

the composite condenser is configured such that heat energy generated during a process in which a refrigerant circulates in the refrigeration circuit can be absorbed by the refrigerant circulating in the defrost circuit.

Optionally, the composite condenser is provided with a plurality of condensing channels and a plurality of evaporating channels on a cross section perpendicular to a main flow direction of the refrigerant; and/or the area of the cross section of the condensation channel is larger than that of the cross section of the evaporation channel.

Alternatively, a plurality of the aforementioned condensation channels and a plurality of the aforementioned evaporation channels are arranged in a staggered manner with respect to each other.

Optionally, the condensing fan of the refrigerator is configured to be capable of rotating forward when a refrigerant circulates in the refrigeration circuit to form a forward airflow; the condensing fan is also configured to be capable of reversing when a refrigerant circulates in the defrosting circuit so as to form reverse airflow; the plurality of condensing passages and the plurality of evaporating passages are arranged such that the area of contact between the condensing passages and the forward airflow is larger than the area of contact between the condensing passages and the reverse airflow, and the area of contact between the evaporating passages and the forward airflow is smaller than the area of contact between the evaporating passages and the reverse airflow.

Optionally, the composite condenser further comprises a plurality of fins distributed at intervals, and the condensation channel and the evaporation channel are respectively of tubular structures mounted on the plurality of fins, so that the condensation channel can dissipate heat through the fins, and the evaporation channel can absorb heat through the fins.

Optionally, the composite condenser further includes a substrate having heat dissipation ribs, and the condensation channel and the evaporation channel are respectively in a hole structure formed on the substrate.

Optionally, the refrigerator further comprises an evaporation pan configured to accommodate at least a portion of the composite condenser, so that the composite condenser can heat the condensed water in the evaporation pan.

Optionally, the refrigerator further includes a lifting device for driving the evaporation pan to lift, and the lifting device is configured to descend when a refrigerant circulates in the defrosting circuit, so that the level of the condensed water in the evaporation pan is lower than the lowest position of the composite condenser, thereby preventing the condensed water from being excessively cooled.

Optionally, the refrigerator further includes a high temperature sensor for detecting a temperature of the composite condenser and an ambient temperature sensor for detecting an ambient temperature, and the lifting device is configured to be lowered when a temperature detected by the high temperature sensor is lowered to a temperature detected by the ambient temperature sensor while a refrigerant circulates in the defrost circuit.

Optionally, the condensing fan of the refrigerator is configured to start rotating when the temperature detected by the high temperature sensor is reduced to the temperature detected by the ambient temperature sensor during the circulation of the refrigerant in the defrosting circuit.

Based on the foregoing description, it can be understood by those skilled in the art that, in the foregoing technical solution of the present invention, by setting the original condenser on the refrigerator as a composite condenser, the refrigerator can defrost the evaporator by means of the composite condenser. Specifically, the composite condenser is provided with the condensation channel and the evaporation channel, so that the composite condenser can refrigerate the evaporator by means of the condensation channel, and the refrigeration function of the refrigerator is ensured; and enabling the composite condenser to heat the evaporator by means of the evaporation channel, so that the heated evaporator can quickly remove frost on the surface of the heated evaporator. Furthermore, the compressor, the condensation channel, the refrigeration pressure reduction component and the evaporator are sequentially connected end to form a refrigeration loop of the refrigerator, so that the refrigerant flowing out of the compressor can be radiated at the condensation channel of the composite condenser, the heat of the refrigerant in the whole loop is reduced, the low-temperature refrigerant absorbs heat at the evaporator, and the refrigeration purpose of the refrigerator is realized. The compressor, the evaporator, the defrosting depressurization member and the evaporation channel are sequentially connected end to form a defrosting loop of the refrigerator, so that high-temperature refrigerants flowing out of the compressor can directly flow to the evaporator to heat the evaporator and remove frost on the evaporator; and the refrigerant flowing out of the evaporator is subjected to pressure reduction, expansion and temperature reduction after passing through the defrosting and pressure reducing component, and then flows to the evaporation channel of the composite condenser to refrigerate the composite condenser (namely, the refrigerant absorbs heat at the composite condenser).

Furthermore, the composite condenser is configured to enable heat energy generated in the process that the refrigerant circulates in the refrigeration loop to be absorbed by the refrigerant circulating in the defrosting loop, so that the refrigerant in the defrosting loop can fully utilize waste heat generated by the refrigeration loop, the refrigerant in the defrosting loop can be rapidly heated, the evaporator is rapidly heated, and frost on the evaporator is rapidly removed. Meanwhile, heat energy generated by the composite condenser in the process of circulating the refrigerant in the refrigeration loop can be absorbed by the refrigerant circulating in the defrosting loop, namely, the refrigerant in the refrigeration loop can fully utilize waste cold generated by the defrosting loop, so that an evaporator in the refrigeration loop can be quickly recovered to normal refrigeration temperature. Therefore, the refrigerator can not only quickly remove the frost on the evaporator, but also fully utilize the waste heat of the refrigeration loop and the waste cold of the defrosting loop, improve the utilization rate of energy and reduce the energy consumption.

Furthermore, the contact area of the condensation channel and the forward airflow is larger than that of the reverse airflow, and the contact area of the evaporation channel and the forward airflow is smaller than that of the reverse airflow, so that the condensation fan rotates forwards when a refrigerant circulates in the refrigeration loop to drive the air to cool the condensation channel; and the condensing fan is made to rotate reversely when the refrigerant circulates in the defrosting loop, and the air is driven to perform key heating on the evaporation channel. Therefore, the refrigerator provided by the invention ensures that the evaporation channel is efficiently heated while the condensation channel is efficiently cooled by changing the steering direction of the condensation fan.

Furthermore, the refrigerator is provided with a lifting device for driving the evaporation pan to lift, so that the evaporation pan can be lowered to a position where the liquid level of condensed water is lower than that of the composite condenser in the process of circulating a refrigerant in the defrosting circuit, the condensed water is prevented from being excessively cooled by the composite condenser, the composite condenser can be in contact with flowing air through the largest surface area, and heat energy in the flowing air is absorbed.

The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly explain the technical solution of the present invention, some embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. Those skilled in the art will appreciate that elements or portions of the same reference number are the same or similar in different figures; the drawings of the invention are not necessarily to scale relative to each other.

In the drawings:

FIG. 1 is a schematic view of the distribution effect of compartments of a refrigerator according to some embodiments of the present invention;

FIG. 2 is a schematic diagram of a refrigerant circulation system of a refrigerator according to some embodiments of the present invention;

fig. 3 is a schematic view illustrating a communication effect of the refrigerant cycle system shown in fig. 2 during a refrigerating process of the refrigerator;

FIG. 4 is a schematic view illustrating the communication effect of the refrigerant cycle system shown in FIG. 2 during defrosting of the refrigerator;

FIG. 5 is a schematic illustration of the axial effect of the defrosting apparatus in some embodiments of the invention;

FIG. 6 is a schematic end-side effect of the defroster in some embodiments of the invention;

FIG. 7 is a schematic illustration of the effect of the defroster on axis in other embodiments of the invention.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only a part of the embodiments of the present invention, not all of the embodiments of the present invention, and the part of the embodiments are intended to explain the technical principle of the present invention and not to limit the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art based on the embodiments provided by the present invention without inventive effort, shall still fall within the scope of protection of the present invention.

It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element 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.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1 illustrates the compartment distribution of a refrigerator according to some embodiments of the present invention.

In some of the embodiments, the refrigerator includes a cabinet 1, a refrigerating compartment 2, a freezing compartment 3, a refrigerating compartment 4, a press compartment 5, and an evaporating dish 6. The refrigerating chamber 2, the freezing chamber 3, the refrigerating chamber 4 and the press bin 5 are sequentially arranged in the box body 1 from top to bottom. Alternatively, the distribution of the refrigerating chamber 2, the freezing chamber 3, the refrigerating chamber 4 and the press cabin 5 in the box body 1 can be adjusted by those skilled in the art according to the needs, for example, the refrigerating chamber 2 is arranged below the freezing chamber 3, and the refrigerating chamber 4 and the press cabin 5 are arranged side by side at the lowest position of the box body 1; the refrigerating compartment 4 is provided at one side in the horizontal direction of the refrigerating compartment 2 and/or the freezing compartment 3. In addition, the person skilled in the art can omit the provision of the refrigerating chamber 2 as necessary. The evaporation pan 6 is arranged in the press cabin 5, or the person skilled in the art can arrange the evaporation pan 6 in any other feasible position on the box 1, as desired, for example, a separate cabin is provided for the evaporation pan 6.

Fig. 2 to 4 are schematic views of a refrigerant circulation system of a refrigerator according to some embodiments of the present invention.

As shown in fig. 2, in some embodiments, the refrigerator further includes a compressor 7, a composite condenser 8, a dryer 9, a refrigeration pressure reducing member 10, an evaporator 11, a gas-liquid separator 12, a bypass branch 13, a control valve group 14, a defrosting pressure reducing member 15, and a condensing fan 16.

Wherein the compressor 7 and the composite condenser 8 are arranged in the press cabin 5, and at least a part of the composite condenser 8 is accommodated by the evaporation pan 6, so that the at least a part of the composite condenser 8 is submerged by the condensed water in the evaporation pan 6. The evaporating dish 6 is used for receiving and storing condensed water.

The composite condenser 8 includes a condensation passage 81 and an evaporation passage 82.

Further, the refrigerator further includes a refrigerating circuit (a path shown by a solid line in fig. 3) and a defrosting circuit (a path shown by a solid line in fig. 4).

As shown in fig. 3, the refrigeration circuit comprises a compressor 7, a condensing passage 81, a refrigerant depressurizing means 10 and an evaporator 11, which are connected end to end in this order. As can be seen in fig. 2, the refrigeration circuit further comprises a drier 9 connected in series between the condensation passage 81 and the refrigerated pressure reducing member 10 and a gas-liquid separator 12 connected in series between the evaporator 11 and the compressor 1.

The dryer 9 may be configured to filter out foreign matters in the refrigerant and dry the refrigerant. Therefore, on the premise that the refrigerant meets the actual application requirements, a person skilled in the art can also omit the dryer 9 according to the actual needs; alternatively, the dryer 9 is placed in any other feasible location in the refrigeration circuit. For example, the dryer 9 is connected in series between the compressor 7 and the condensation passage 81.

As will be understood by those skilled in the art, in the refrigeration circuit (ideally), the refrigerant flowing out of the compressor 7 is a high-temperature and high-pressure gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant is cooled by heat dissipation while flowing through the condensing passage 81, and becomes a low-temperature and high-pressure liquid refrigerant. When the low-temperature and high-pressure liquid refrigerant flows through the refrigerant depressurizing means 10, the pressure is reduced, and the refrigerant is expanded into a low-temperature and low-pressure gas refrigerant. The low-temperature low-pressure gaseous refrigerant absorbs heat in the evaporator 11 and turns into a high-temperature low-pressure gaseous refrigerant, thereby refrigerating the refrigerator. The high-temperature low-pressure gas refrigerant is compressed into a high-temperature high-pressure gas refrigerant again when flowing through the compressor 7.

As shown in fig. 4, the defrost circuit includes the compressor 7, the evaporator 11, the defrost pressure reducing member 15, and the evaporation passage 82 in serial end-to-end communication. As can be seen from fig. 2, the defrost circuit further comprises a gas-liquid separator 12 connected in series between the evaporation channel 82 and the compressor 1. The defrost circuit also comprises a bypass branch 13 connecting the compressor 7 and the evaporator 11 in series. Specifically, one end of the bypass branch 13 communicates with the compressor 7, and the other end of the bypass branch 13 communicates with the evaporator 11.

As will be understood by those skilled in the art, in the defrosting circuit (ideally), the refrigerant flowing out of the compressor 7 is a high-temperature and high-pressure gaseous refrigerant, and the high-temperature and high-pressure gaseous refrigerant is cooled by heat dissipation through the evaporator 11 (i.e., heats and defrosts the evaporator 11) and becomes a low-temperature and high-pressure liquid refrigerant. When the low-temperature and high-pressure liquid refrigerant flows through the defrosting and depressurizing device 15, the pressure is reduced, and the refrigerant is expanded into a low-temperature and low-pressure gaseous refrigerant. The low-temperature low-pressure gaseous refrigerant absorbs heat in the evaporation channel 82 and is changed into a high-temperature low-pressure gaseous refrigerant, so that the refrigerator is cooled. The high-temperature low-pressure gas refrigerant is compressed into a high-temperature high-pressure gas refrigerant again when flowing through the compressor 7.

In some embodiments shown in fig. 2, refrigerant is selectively circulated through the refrigeration circuit or the defrost circuit by control valve block 14. The method comprises the following specific steps:

as shown in fig. 2, the control valve group 14 includes a first control valve 141 and a second control valve 142. The first control valve 141 is respectively communicated with the outlet of the compressor 7, the inlet of the condensing passage 81 and the inlet of the bypass branch 13, so that the refrigerant flowing out of the compressor 7 selectively flows to the condensing passage 81 or the bypass branch 13. The second control valve 142 communicates with the outlet of the evaporator 11, the inlet of the defrosting pressure reducing member 15, and the inlet of the gas-liquid separator 12, respectively, so that the refrigerant flowing out of the evaporator 11 selectively flows toward the defrosting pressure reducing member 15 or directly toward the gas-liquid separator 12.

As shown in fig. 3, when the first control valve 141 controls the refrigerant to flow from the compressor 7 to the condensing passage 81, the second control valve 142 controls the refrigerant to flow directly from the evaporator 11 to the gas-liquid separator 12 to turn on the refrigeration circuit, thereby circulating the refrigerant in the refrigeration circuit. Specifically, in the refrigeration circuit, the first control valve 141 controls the flow of the refrigerant from the compressor 7 to the condensation passage 81, and the second control valve 142 controls the flow of the refrigerant from the evaporator 11 to the defrosting pressure reducing member 15. The refrigerant circulates in sequence through the compressor 7, the first control valve 141, the condensation passage 81, the composite condenser 8, the dryer 9, the refrigerating and depressurizing device 10, the evaporator 11, the second control valve 142, and the gas-liquid separator 12.

As shown in fig. 4, when the first control valve 141 controls the refrigerant to flow from the compressor 7 to the bypass branch 13, the second control valve 142 controls the refrigerant to flow from the evaporator 11 to the defrost pressure reducing member 15 to turn on the defrost circuit, thereby circulating the refrigerant in the defrost circuit. Specifically, in the defrost circuit, the first control valve 141 controls the refrigerant to flow from the compressor 7 to the bypass branch 13, and the second control valve 142 controls the refrigerant to flow from the evaporator 11 to the defrost pressure reducing member 15. The refrigerant circulates in sequence through the compressor 7, the bypass branch 13, the evaporator 10, the defrosting pressure-reducing member 15, the defrosting passage 82, and the gas-liquid separator 12.

In fig. 3 and 4, the solid lines between the components connected in series indicate that the refrigerant is allowed or allowed to flow; the dashed lines between the components connected in series indicate that no or no refrigerant is allowed to flow.

It should be further noted that, in the premise that the first control valve 141 and the second control valve 142 can achieve the above functions, the first control valve 141 and the second control valve 142 can be a three-way valve as shown in fig. 2 to 4, and a person skilled in the art can set the first control valve 141 and/or the second control valve 142 as any other feasible valve elements, such as two parallel stop valves, a four-way valve, etc., according to needs.

As will be understood by those skilled in the art, during the circulation of the refrigerant in the refrigeration circuit shown in fig. 3, the condensation channel 81 serves as a heat dissipation member for the refrigerant (i.e., the composite condenser 8 serves as a condenser of the refrigeration circuit), so that the refrigerant can dissipate heat into the condensed water in the evaporation pan 6 when flowing through the condensation channel 81, and heat the condensed water, so that the temperature of the condensed water is higher than the ambient temperature, and therefore a large amount of heat energy is stored.

It will also be understood by those skilled in the art that during circulation of the refrigerant in the defrost circuit shown in fig. 4, the evaporator 11 acts as a condenser for the refrigerant, cooling the refrigerant. That is, since the refrigerant has a high temperature when flowing out of the compressor 7, the refrigerant can uniformly release a large amount of heat at the evaporator 11 while flowing through the evaporator 11, so that the frost on the outer surface of the evaporator 11 can be rapidly and uniformly melted. The refrigerant is decompressed and expanded after passing through the defrosting decompression member 15, and the temperature of the refrigerant is lowered, so that the refrigerant absorbs heat from the condensation passage 81 and the condensed water when passing through the defrosting passage 82, and the heat is supplemented to the defrosting circuit, and is intensively released at the evaporator 11 to melt the frost. Since the condensed water in the defrosting channel 82 and the evaporating pan 6 stores a large amount of heat in the refrigeration circuit shown in fig. 3, the defrosting channel 82 rapidly absorbs a large amount of heat from the condensed water in the defrosting channel 82 and the evaporating pan 6 in the defrosting circuit shown in fig. 4, so that the refrigerant is rapidly heated, and thus, the refrigerant can rapidly release heat to the evaporator 11 when flowing through the evaporator 11, and thus, the frost is rapidly melted.

It can be seen that the refrigerator of the present invention enables the evaporation channel to fully utilize the condensed water in the evaporation pan 6 and the residual heat of the composite condenser 8 to defrost the evaporator 11 by arranging the composite condenser 8 in the evaporation pan 6 and being immersed by the condensed water in the evaporation pan 6. The heat load of the defrosting loop is increased, the defrosting time of the evaporator 11 is shortened, the air in the refrigerating chamber 4 is prevented from being greatly heated, and the temperature rise of the refrigerating chamber 2 and the freezing chamber 3 is effectively restrained; meanwhile, the energy consumption of the evaporator 11 during defrosting is also reduced.

It should be noted that the refrigeration pressure-reducing member 10 and/or the defrosting pressure-reducing member 15 of the present invention may be a member having an orifice or a pressure-reducing valve, in addition to the capillary tube shown in fig. 2 to 4.

As shown in fig. 2 to 4, in some embodiments of the present invention, the refrigerator further includes a high temperature sensor 83 for detecting the temperature of the complex condenser 8 and an ambient temperature sensor 17 for detecting the ambient temperature. Wherein the high temperature sensor 83 and the ring temperature sensor 17 can be disposed at any feasible positions, such as mounting the high temperature sensor 83 on the composite condenser 8 and fixing the ring temperature sensor 17 to the refrigerator body 1.

As shown in fig. 2 to 4, in some embodiments of the present invention, the refrigerator further includes a lifting device 18 for driving the evaporation pan 6 to lift, and the lifting device 18 is configured to lower when the refrigerant circulates in the defrosting circuit so that the condensate water level 61 in the evaporation pan 6 is lower than the lowest position of the composite condenser 8. So as to prevent the condensed water from being excessively cooled by the composite condenser 8, and increase the contact area of the composite condenser 8 with the flowing air, and absorb the heat energy in the flowing air. The lifting device 18 may be any feasible device, provided that the lifting of the evaporating dish 6 can be realized.

As an example one, the lifting device 18 comprises a motor fixed to the casing 1 and a cam in driving connection with the motor, the cam being located below the evaporating dish 6 and abutting against the bottom wall of the evaporating dish 6. When the motor drives the cam to rotate, the evaporation pan 6 can be lifted.

As an example two, the lifting device 18 includes a motor fixed on the box body 1 and a lead screw in driving connection with the motor, and a lead screw nut matched with the lead screw is fixed on the evaporating dish 6. The rotating motor can drive the evaporating dish 6 to ascend or descend through the screw-nut pair.

As an example three, the lifting device 18 is an electromagnetic push rod fixed to the case 1, which pushes the evaporation pan 6 to ascend or descend.

The following is a brief explanation of the defrost control logic of the refrigerator of the present invention:

when the refrigerator receives a defrosting instruction, the refrigerator is firstly controlled to pre-cool the refrigerating chamber 2 and/or the freezing chamber 3, and the condensation fan 16 of the composite condenser 8 is stopped. The refrigerator is then operated according to the defrost circuit shown in fig. 4. When the temperature detected by the high temperature sensor 83 is reduced to the temperature detected by the ambient temperature sensor 17, the condensing fan 16 of the compound condenser 8 is operated; when the defrosting sensor detects that the evaporator 11 reaches the defrosting temperature, the compressor 7 and the condensing fan 16 are stopped for a while. The refrigerator repeats the above operations described in this paragraph a number of times to achieve the goal of defrosting.

Further, when the temperature detected by the high temperature sensor 83 is lowered to the temperature detected by the ambient temperature sensor 17 during the circulation of the refrigerant in the defrosting circuit, the elevating device 18 is controlled to lower the evaporating dish 6. So as to prevent the condensed water from being excessively cooled by the composite condenser 8, and increase the contact area of the composite condenser 8 with the flowing air, and absorb the heat energy in the flowing air.

Based on the foregoing description, those skilled in the art can understand that the refrigerator of the present invention can fully utilize the heat generated by the refrigeration circuit during the defrosting of the condenser 11 by means of the composite condenser 8; and in the refrigeration process, the composite condenser 8 can fully utilize the cold energy generated by the defrosting loop, so that the rapid defrosting of the condenser 11 is realized, and the energy consumption is reduced.

Fig. 5 and 6 illustrate a compound condenser 8 in some embodiments of the invention.

As shown in fig. 5 and 6, in some embodiments, the condensing channels 81 and the evaporating channels 82 are both tubular structures. In addition, the composite condenser 8 has a plurality of condensation channels 81 and a plurality of evaporation channels 82 distributed in a cross section perpendicular to a main flow direction of the refrigerant (an extending direction of the condensation channels 81 shown in fig. 5). Wherein the plurality of condensing passages 81 and the plurality of evaporating passages 82 are arranged alternately with each other.

Further, the cross-sectional area of the condensing passage 81 is larger than that of the evaporating passage 82. Preferably, the cross-sectional area of the condensing passages 81 is 2 to 4 times the cross-sectional area of the evaporating passages 82. So as to reduce the resistance of the refrigerant flowing through the condensation passage 81 while ensuring the heat dissipation capability of the refrigerant flowing through the condensation passage 81 and the heat absorption capability of the refrigerant flowing through the evaporation passage 82.

As shown in fig. 5, in some embodiments, the compound condenser 8 further includes a plurality of spaced fins 84, the plurality of fins 84 being spaced along the condensing channels 81 and securing the plurality of condensing channels 81 and the plurality of evaporating channels 82 together. Alternatively, the high temperature sensor 83 may be mounted to the fin 84.

Further, in some embodiments of the present invention, the condensing fan 16 of the refrigerator is configured to rotate forward when the refrigerant circulates in the refrigeration circuit to form a forward airflow; the condenser fan 16 is also configured to reverse direction as the refrigerant circulates through the defrost circuit to create a reverse flow. The plurality of condensation passages 81 and the plurality of evaporation passages 82 are configured such that the condensation passages 81 have a larger contact area with the forward air flow than with the reverse air flow, and the evaporation passages 82 have a smaller contact area with the forward air flow than with the reverse air flow.

For example, when the condensing fan 16 is set to rotate forward, a forward airflow is blown from the left side to the right side of the composite condenser 8 in fig. 6; when the condensing fan 16 is reversed, the reversed air flow is blown from the right side to the left side of the composite condenser 8 in fig. 6. Since most of the right sides of the condensation channels 81 in fig. 6 have one evaporation channel 82, that is, the evaporation channel 82 shields the right side of the condensation channel 81, so that the area of the left side of the condensation channel 81 facing the air flow is larger than the area of the right side of the condensation channel 81 facing the air flow, and the heat dissipation is faster when the condensation channel 81 faces the forward air flow. Similarly, since most of the evaporating channels 82 in fig. 6 have a condensing channel 81 on the left side, that is, the condensing channel 81 shields the left side of the evaporating channel 82, so that the area of the right side of the evaporating channel 82 facing the airflow is larger than the area of the left side of the evaporating channel 82 facing the airflow, and thus the evaporating channel 82 can dissipate heat quickly when facing the reverse airflow.

Based on the foregoing description, those skilled in the art can understand that the condensation channels 81 can dissipate heat through the fins 4 in addition to themselves; the evaporation channel 82 can absorb heat through the fin 4 in addition to itself.

Fig. 7 shows a defroster in other embodiments of the present invention.

As shown in fig. 7, unlike the embodiment shown in fig. 5 and 6, in this other embodiment, the composite condenser 8 further includes a base body 85 having heat dissipating ribs 851, and the condensing passages 81 and the evaporating passages 82 are respectively formed in a hole structure on the base body 85. Alternatively, the high temperature sensor 83 may be mounted on the base 85.

So far, the technical solution of the present invention has been described in connection with the foregoing embodiments, but it is easily understood by those skilled in the art that the scope of the present invention is not limited to these specific embodiments. A person skilled in the art may split and combine the technical solutions in the above embodiments without departing from the technical principle of the present invention, and may also make equivalent changes or substitutions for the related technical features, and any changes, equivalents, improvements, etc. made within the technical idea and/or technical principle of the present invention will fall within the protection scope of the present invention.

Claims (10)

1. A refrigerator having a defrosting function, comprising:

a compound condenser comprising a condensing channel and an evaporating channel;

the refrigeration loop comprises a compressor, the condensation channel, a refrigeration pressure-reducing component and an evaporator which are sequentially communicated end to end;

the defrosting circuit comprises the compressor, the evaporator, a defrosting depressurization component and the evaporation channel which are sequentially communicated end to end;

a control valve block configured to control refrigerant to selectively circulate in the refrigeration circuit or the defrost circuit;

the composite condenser is configured such that heat energy generated during circulation of a refrigerant in the refrigeration circuit can be absorbed by the refrigerant circulating in the defrost circuit.

2. The refrigerator having a defrosting function according to claim 1, wherein,

the composite condenser is provided with a plurality of condensing channels and a plurality of evaporating channels on the section perpendicular to the main flow direction of the refrigerant; and/or the like, and/or,

the area of the cross section of the condensing channel is larger than that of the cross section of the evaporating channel.

3. The refrigerator having a defrosting function according to claim 2, wherein,

the plurality of condensing channels and the plurality of evaporating channels are arranged in a staggered manner with respect to each other.

4. The refrigerator having a defrosting function according to claim 2 or 3, wherein,

the condensation fan of the refrigerator is configured to be capable of rotating forward when a refrigerant circulates in the refrigeration loop so as to form forward airflow; the condensation fan is also configured to be capable of reversing when a refrigerant circulates in the defrosting loop so as to form reverse airflow;

the plurality of condensing channels and the plurality of evaporating channels are configured such that the condensing channels have a larger contact area with the forward airflow than with the reverse airflow and such that the evaporating channels have a smaller contact area with the forward airflow than with the reverse airflow.

5. The refrigerator having a defrosting function according to claim 2 or 3, wherein,

the composite condenser further comprises a plurality of fins distributed at intervals, and the condensation channel and the evaporation channel are respectively of tubular structures mounted on the plurality of fins, so that the condensation channel can dissipate heat through the fins, and the evaporation channel can absorb heat through the fins.

6. The refrigerator having a defrosting function according to claim 1 or 2, wherein,

the composite condenser also comprises a substrate with heat dissipation ribs, and the condensation channel and the evaporation channel are respectively of a hole structure formed on the substrate.

7. The refrigerator having a defrosting function according to any one of claims 1 to 3,

the refrigerator also includes an evaporation pan configured to receive at least a portion of the composite condenser such that the composite condenser is capable of heating condensed water within the evaporation pan.

8. The refrigerator having a defrosting function according to claim 7, wherein,

the refrigerator also comprises a lifting device for driving the evaporation pan to lift, wherein the lifting device is configured to descend when a refrigerant circulates in the defrosting loop, so that the liquid level of condensed water in the evaporation pan is lower than the lowest position of the composite condenser.

9. The refrigerator having a defrosting function according to claim 8, wherein,

the refrigerator further comprises a high temperature sensor for detecting the temperature of the composite condenser and an ambient temperature sensor for detecting the ambient temperature,

the elevating device is configured to be lowered when the temperature detected by the high temperature sensor is lowered to the temperature detected by the ambient temperature sensor during the circulation of the refrigerant in the defrost circuit.

10. The refrigerator having a defrosting function according to claim 9, wherein,

the condensing fan of the refrigerator is configured to start rotating when the temperature detected by the high temperature sensor is reduced to the temperature detected by the ambient temperature sensor in the process of circulating the refrigerant in the defrosting circuit.

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