CN117663633A

CN117663633A - Refrigerating system, refrigerating equipment and refrigerator

Info

Publication number: CN117663633A
Application number: CN202211008286.9A
Authority: CN
Inventors: 容国练; 余圣辉; 叶钰龙; 陈瑞博; 劳良铖; 麦国贺; 周志成; 曾文
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: 2022-08-22
Filing date: 2022-08-22
Publication date: 2024-03-08

Abstract

The invention discloses a refrigerating system, refrigerating equipment and a refrigerator, which comprise a first loop and a second loop, wherein the first loop comprises a first refrigerant passage used for conveying a refrigerant to a first evaporator and a second refrigerant passage used for outputting the refrigerant by the first evaporator, and the first evaporator is used for cooling a storage compartment in an air cooling mode; the second loop comprises a third refrigerant passage for conveying the refrigerant to the second evaporator and a fourth refrigerant passage for outputting the refrigerant by the second evaporator, wherein the second evaporator is used for cooling the storage compartment in a direct cooling mode; the heat exchange device can pre-cool the mixed refrigerant in the first refrigerant passage by outputting the cold quantity of the refrigerant by the first evaporator and/or the second evaporator, so that the cooling effect of the first evaporator on the storage compartment can be effectively improved, and in the defrosting stage, the second valve is controlled to be opened, so that the second evaporator can maintain the cooling of the storage compartment in a direct cooling mode, and the temperature rise of defrosting heat to food can be avoided.

Description

Refrigerating system, refrigerating equipment and refrigerator

Technical Field

The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system, refrigeration equipment and a refrigerator.

Background

The temperature range of the existing market refrigerators is mostly set in the range of-18 ℃ to 7 ℃. Along with the improvement of the living standard of people, the demand for food storage is also greatly improved. In order to meet the demands of people, a refrigerator capable of providing a cryogenic storage environment with the temperature below-40 ℃ needs to be designed, and in the cryogenic storage environment, foods can quickly pass through an ice crystal zone to reach a glassy preservation state, so that a better food fresh-keeping effect is achieved. However, the existing cryogenic refrigerator has the defects of low cooling speed, troublesome defrosting and influence on food due to temperature rise in the defrosting process.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a refrigerating system, refrigerating equipment and a refrigerator, which can avoid temperature rise of defrosting heat to food during defrosting.

A refrigeration system of a refrigerator according to an embodiment of a first aspect of the present invention includes:

the first loop comprises a first evaporator and a first valve, and further comprises a first refrigerant passage for conveying a refrigerant to the first evaporator and a second refrigerant passage for outputting the refrigerant by the first evaporator, wherein the first evaporator is used for cooling a storage compartment in an air cooling mode;

The second loop comprises a second evaporator and a second valve, the second loop also comprises a third refrigerant passage for conveying a refrigerant to the second evaporator and a fourth refrigerant passage for outputting the refrigerant by the second evaporator, and the second evaporator is used for cooling the storage compartment in a direct cooling mode;

the refrigerants flowing in the first loop and the second loop are mixed refrigerants and comprise a first refrigerant and a second refrigerant, and the boiling point of the first refrigerant is higher than that of the second refrigerant;

the heat exchange device is used for precooling the mixed refrigerant, and at least one part of the first refrigerant passage, the second refrigerant passage, the third refrigerant passage and the fourth refrigerant passage is arranged in the heat exchange device;

a heater for defrosting the first evaporator;

and the controller is used for controlling the first valve to be closed in a defrosting stage, controlling the second valve to be opened and controlling the heater to be opened so that the second evaporator maintains the cooling of the storage compartment in a direct cooling mode in the defrosting process of the first evaporator by the heater.

The refrigerating system provided by the embodiment of the invention has at least the following beneficial effects: the heat exchange device can precool the mixed refrigerant in the first refrigerant passage by outputting the cold quantity of the refrigerant by the first evaporator and/or the second evaporator, the cooling effect of the first evaporator on the storage compartment can be effectively improved, the effect of cryogenic storage can be realized by the first evaporator in an air cooling mode, automatic defrosting can be conveniently carried out due to the fact that the air cooling and cooling mode mainly frosts the first evaporator, and in the defrosting stage, the second evaporator can maintain the cooling of the storage compartment in a direct cooling mode by controlling the opening of the second valve, so that the temperature rise of defrosting heat to food can be avoided.

According to some embodiments of the invention, the refrigeration system further comprises a compressor, a condenser, a first throttling device, and a second throttling device; the exhaust port of the compressor, the condenser, the first throttling device, the first evaporator and the air inlet of the compressor are sequentially connected to form the first loop; the exhaust port of the compressor, the condenser, the second throttling device, the second evaporator and the air inlet of the compressor are sequentially connected to form the second loop; the first refrigerant passage is arranged between the first throttling device and the condenser, the second refrigerant passage is arranged between the first evaporator and the air inlet of the compressor, the third refrigerant passage is arranged between the second throttling device and the condenser, and the fourth refrigerant passage is arranged between the second evaporator and the air inlet of the compressor.

In some embodiments of the present invention, any section of the condenser and the first evaporator may be provided as the first refrigerant passage, for example, the first refrigerant passage is provided between the first throttling device and the first evaporator, or all passages from the condenser to the first evaporator are regarded as the first refrigerant passage. Similarly, any section between the condenser and the second evaporator may be provided as the third refrigerant passage, for example, the third refrigerant passage is provided between the second throttle device and the second evaporator, or all the passages from the condenser to the second evaporator may be regarded as the third refrigerant passage.

According to some embodiments of the invention, the first valve is disposed between the first throttling device and the condenser, and the second valve is disposed between the second throttling device and the condenser. By opening the first valve, the refrigerant output from the condenser can flow into the first throttling device and the first evaporator to open the first evaporator. The refrigerant output by the condenser can flow into the second throttling device and the second evaporator by opening the second valve so as to open the second evaporator. By simultaneously opening the first valve and the second valve, the refrigerant output by the condenser can enter the first throttling device and the second throttling device respectively and finally flow through the first evaporator and the second evaporator respectively, so that the first evaporator and the second evaporator are opened simultaneously.

According to some embodiments of the invention, a one-way valve is provided between the output of the first evaporator and the output of the second evaporator.

According to some embodiments of the invention, the first refrigerant is a refrigerant of R600a type; the second refrigerant is a refrigerant of R170 or 1150 type.

According to some embodiments of the invention, the condenser is configured to liquefy the first refrigerant flowing through the condenser, and the second refrigerant flowing through the condenser is maintained in a gaseous state.

According to some embodiments of the invention, the heat exchange device is configured to directly cool the second refrigerant in the first refrigerant passage and/or the third refrigerant passage by the cooling capacity of the refrigerant in the second refrigerant passage and/or the fourth refrigerant passage, so as to liquefy the second refrigerant.

According to some embodiments of the invention, the controller is further configured to control the second valve to be closed and control the first valve to be opened during a dehumidification and pre-cooling stage, so that the first evaporator cools the storage compartment in an air cooling manner, and moisture in the storage compartment is condensed on the first evaporator.

According to some embodiments of the invention, the controller is further configured to control the first valve and the second valve to be opened before the heater is opened in the defrosting stage, so that the cooling capacity of the cooling medium in the second cooling medium passage and the fourth cooling medium passage precools the cooling medium in the third cooling medium passage through the heat exchange device.

According to some embodiments of the invention, the controller is further configured to control the heater to be turned off, control the first valve to be turned on, and control the second valve to be turned off after defrosting the first evaporator is completed, so that the first evaporator is used for cooling the storage compartment through air cooling.

According to some embodiments of the invention, the controller is further configured to control the first valve and the second valve to be opened simultaneously after the heater is turned off and before the second valve is turned off, so that the cooling capacity of the cooling medium in the second cooling medium passage and the fourth cooling medium passage precools the cooling medium in the first cooling medium passage through the heat exchange device.

According to some embodiments of the invention, the controller is further configured to control the first valve and the second valve to be opened simultaneously during the enhanced refrigeration stage, so that the first evaporator cools the storage compartment by air cooling, and simultaneously, the second evaporator cools the storage compartment by direct cooling.

According to a second aspect of the present invention, there is provided a refrigeration system comprising:

heat exchange means for pre-cooling the mixed refrigerant, at least one of the first refrigerant passage and the third refrigerant passage being configured to be at least partially disposed in the heat exchange means, at least one of the second refrigerant passage and the fourth refrigerant passage being configured to be at least partially disposed in the heat exchange means;

a heater for defrosting the first evaporator;

A refrigeration appliance according to an embodiment of the third aspect of the present invention includes a refrigeration system according to an embodiment of the first or second aspect of the present invention.

A refrigerator according to an embodiment of a fourth aspect of the present invention includes a refrigeration system according to an embodiment of the first or second aspect of the present invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The invention is further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic view of a refrigerator according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A shown in FIG. 1;

FIG. 3 is a schematic diagram illustrating the connection between the liner and the second evaporator shown in FIG. 2;

FIG. 4 is an exploded view of the air duct component shown in FIG. 2;

FIG. 5 is a schematic view of the air duct component of FIG. 4 with the air duct rear cover omitted;

FIG. 6 is another angular schematic view of the air duct component shown in FIG. 5;

fig. 7 is an enlarged view at B shown in fig. 6;

FIG. 8 is a schematic view of the drive structure shown in FIG. 7;

FIG. 9 is a C-C cross-sectional view shown in FIG. 8;

FIG. 10 is a schematic view of the air duct component shown in FIG. 2;

FIG. 11 is a D-D sectional view of FIG. 10;

fig. 12 is an enlarged view at E shown in fig. 11;

FIG. 13 is a system schematic diagram of a refrigeration system according to an embodiment of the present invention;

fig. 14 is a flowchart of a control method of a refrigeration apparatus according to an embodiment of the present invention;

fig. 15 is a flowchart of a control method of a refrigeration apparatus according to an embodiment of the present invention;

FIG. 16a is a flow chart of a method of one embodiment of step 1402 in FIG. 14;

FIG. 16b is a flow chart of a method of another embodiment of step 1402 of FIG. 14;

fig. 17 is a flowchart of a control method of a refrigeration apparatus according to an embodiment of the present invention;

fig. 18 is a flowchart of a control method of the refrigeration apparatus according to the embodiment of the present invention;

fig. 19 is a flowchart of a defrosting control method of a refrigeration apparatus according to an embodiment of the present invention.

Reference numerals:

101. a case;

201. an air duct member; 202. a storage compartment; 203. an evaporation chamber; 204. a return air channel; 205. an air inlet channel; 206. a first evaporator; 207. a second evaporator;

301. an inner container;

401. an air duct rear cover; 402. a foam back cover; 403. a foam front seat; 404. an air duct front plate; 405. a driving structure; 406. a shield; 407. a through hole; 408. an air port;

501. a push-pull sheet;

901. a memory alloy member; 902. an elastic reset piece; 903. a housing; 904. a central shaft; 905. a limit boss;

1201. an air inlet hole; 1202. and an air outlet hole.

1301. A compressor; 1302. a condenser; 1303. an electrically controlled valve assembly; 1304. a first valve; 1305. a second valve; 1306. a first throttle device; 1307. a second throttle device; 1308. a thermal interaction device; 1309. a one-way valve; 1310. a first refrigerant passage; 1311. a second refrigerant passage; 1312. a third refrigerant passage; 1313. and a fourth refrigerant passage.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In general, a cool air inflow hole into which cool air cooled by an evaporator flows is provided between a cool air passage of a refrigerator and a refrigerator compartment. When the refrigerator is refrigerating, the refrigerated cold air flows into the refrigerator compartment through the cold air inflow hole. During the use process of the refrigerator, food and air stored in the compartment contain moisture, the surface temperature of the evaporator is far lower than the dew point of the air in the compartment, the wet air passes through the evaporator, the surface of the evaporator fins is exposed to cold and frosted, when the frost layer on the surface of the evaporator is formed to a certain thickness, the air flow is influenced, the refrigerating effect is influenced, and the evaporator needs to be frosted.

At present, the defrosting method mainly adopts an electric heating defrosting method, in the method, an electric heating wire is generally positioned in an air duct, heat of the heating wire is easily transferred into a box body through the air duct, so that the defrosting efficiency is low, the radiation heat exchange effect is low, and the defrosting effect is poor.

The common air-cooled refrigerator is provided with only one evaporator, refrigeration cannot be continued in the defrosting process, and the heat of defrosting heating can influence food in the refrigerator to a certain extent, so that temperature rise is caused; part of the refrigerator is internally provided with two fin evaporators as dehumidifying evaporators, one fin evaporator is used as a refrigerating evaporator (generally placed up and down, and the dehumidifying evaporator is arranged at the lower part), and when the dehumidifying evaporator is used for defrosting, because of structural limitation, a return air inlet of the refrigerating evaporator at the upper part is arranged above the dehumidifying evaporator, and cold air circulation does not cover the lower part of food directly opposite to the dehumidifying evaporator, and the part of food absorbs heat of the dehumidifying evaporator at the same time, so that the temperature rise is overlarge and the food is possibly damaged; and two fin evaporators arranged up and down have high requirements on space in the box, and the corresponding air duct structure is also complex and has high cost.

Next, with reference to fig. 1 to 13, how the refrigerator according to the embodiment of the present invention solves the above-described problems will be described.

Referring to fig. 1 to 3, a refrigerator according to an embodiment of the present invention includes a cabinet 101, an air duct member 201, a refrigerating system, a heater (not shown), a first damper assembly (not shown), and a second damper assembly (not shown). Wherein the case 101 is provided with a cavity, the air channel member 201 is located in the cavity, and the air channel member 201 divides the cavity into two parts, namely, the storage compartment 202 and the evaporation cavity 203. The air duct component 201 is also provided with an air return channel 204 and an air inlet channel 205, the air inlet channel 205 is communicated with the storage compartment 202 and the evaporation cavity 203, and the air return channel 204 is also communicated with the storage compartment 202 and the evaporation cavity 203.

In some embodiments, referring to fig. 13, the refrigeration system includes a first circuit having a first evaporator 206 and a first valve 1304, and a second circuit having a second evaporator 207 and a second valve 1305, and further includes a compressor 1301 and a condenser 1302, where the first circuit and the second circuit share a compressor 1301 and a condenser 1302.

In one embodiment, referring to fig. 13, the refrigeration system further includes a first throttling device 1306, a second throttling device 1307, and a heat exchange device 1308, wherein the exhaust of the compressor 1301, the condenser 1302, the first valve 1304, the first throttling device 1306, the first evaporator 206, and the intake of the compressor 1301 are sequentially connected to form a first circuit. The first circuit includes a first refrigerant passage 1310 provided between the first throttle device 1306 and the condenser 1302, and a second refrigerant passage 1311 provided between the first evaporator 206 and an intake port of the compressor 1301. The discharge port of the compressor 1301, the condenser 1302, the second valve 1305, the second throttle 1307, the second evaporator 207, and the intake port of the compressor 1301 are connected in this order to form a second circuit. The second circuit includes a third refrigerant passage 1312 disposed between the second throttle device 1307 and the condenser 1302, and a fourth refrigerant passage 1313 disposed between the second evaporator 207 and the intake port of the compressor 1301. At least a portion of the first, second, third, and fourth coolant passages 1310, 1311, 1312, 1313 are disposed in the heat exchange device 1308. The refrigerants output from the first evaporator 206 and the second evaporator 207 respectively enter the second refrigerant passage 1311 and the fourth refrigerant passage 1313, so that the cooling capacity of the refrigerants in the second refrigerant passage 1311 and the fourth refrigerant passage 1313 can pre-cool the refrigerants in the first refrigerant passage 1310 and the third refrigerant passage 1312, thereby improving the cooling effect of the first evaporator 206 and the second evaporator 207.

In another embodiment, separate heat exchange devices may be provided to achieve heat exchange between the first refrigerant passage 1310 and the second refrigerant passage 1311, and heat exchange between the third refrigerant passage 1312 and the fourth refrigerant passage 1313.

In one embodiment, the first valve 1304 and the second valve 1305 may form an electric control valve assembly 1303, and the controller is connected to the electric control valve assembly 1303 to control the states of the first valve 1304 and the second valve 1305, where the electric control valve assembly 1303 controls the flow direction of the refrigerant at the output end of the condenser 1302 through the first valve 1304 and the second valve 1305, and when the first valve 1304 and the second valve 1305 are opened, the output end of the condenser 1302 is simultaneously opened with the first throttling device 1306 and the second throttling device 1307 to connect the first evaporator 206 and the second evaporator 207. When only the first valve 1304 is open, the output of the condenser 1302 and the first restriction 1306 effect a separate opening of the first evaporator 206. When only the second valve 1305 is opened, the output of the condenser 1302 and the second throttle 1307 effect a separate opening of the second evaporator 207.

In an embodiment, any section of the condenser 1302 and the first evaporator 206 may be provided as the first refrigerant passage, for example, the first refrigerant passage is provided between the first throttle device 1306 and the first evaporator 206, or all the passages from the condenser 1302 to the first evaporator 206 are regarded as the first refrigerant passage. Similarly, any one of the condenser 1302 and the second evaporator 207 may be provided as the third refrigerant passage, for example, the third refrigerant passage may be provided between the second throttle device 1307 and the second evaporator 207, or all the passages between the condenser 1302 and the second evaporator 207 may be regarded as the third refrigerant passage.

It should be noted that, in other embodiments, the first circuit and the second circuit may be provided with a compressor and a condenser, respectively, so that the first circuit and the second circuit are in an independent, non-influencing relationship.

Referring to fig. 2, it can be understood that the first evaporator 206 is located in the evaporation cavity 203, and the refrigerator further includes a fan (not shown in the drawing), and the fan generates an air flow, and the air flow brings the cold energy generated by the first evaporator 206 into the air inlet channel 205, then enters the storage compartment 202, and flows back to the evaporation cavity 203 from the return air channel 204, so as to implement circulation. The second evaporator 207 is located outside the storage compartment 202 and exchanges heat with the storage compartment 202 by means of solid heat transfer, so that the first evaporator 206 cools the storage compartment 202 by means of air cooling and the second evaporator 207 cools the storage compartment 202 by means of direct cooling.

It will be appreciated that the heater is located within the evaporation chamber 203 and is turned on to heat defrost when defrosting is desired. A first damper assembly is mounted at the return air duct 204 for closing or opening the return air duct 204. A second damper assembly is mounted at the air intake passage 205 for closing or opening the air intake passage 205. Wherein, in defrost mode, the first air door assembly closes the return air channel 204, the second air door assembly closes the inlet air channel 205, the second evaporator 207 is turned on, and the heater is turned on to defrost the first evaporator 206. In other words, since the first air door assembly closes the return air channel 204 and the second air door assembly closes the air inlet channel 205, the storage compartment 202 and the evaporation cavity 203 are not communicated any more, the influence of heat generated by heating of the heater on the storage compartment 202 is reduced, meanwhile, the second evaporator 207 refrigerates the storage compartment 202, heat of digestive frost can be resisted to raise the temperature of food, and the food is cooled continuously, so that defrosting efficiency is improved, and energy conservation and high efficiency are achieved.

It is understood that the refrigerator may be a single door refrigerator, a side-by-side double door wall cabinet type refrigerator, a three door refrigerator, etc.

Referring to fig. 3, it can be understood that the case 101 includes a liner 301, the liner 301 has a storage compartment 202 therein, and the second evaporator 207 is disposed on an outer wall of the liner 301. Specifically, the second evaporator 207 includes an evaporation tube wound around two side walls, a top wall and a bottom wall of the liner 301, and may be spirally wound, or may be wound in other manners. Alternatively, the second evaporator 207 is a tube-sheet evaporator, and is disposed on two side walls, a top wall, and a bottom wall of the liner 301.

It can be appreciated that the second evaporator 207 supplies cold to the storage compartment 202 in a direct cooling manner, so that the second evaporator 207 can be prevented from frosting faster, the fluctuation of the temperature of the compartment is prevented from being smaller when frequent frosting is required, and the food fresh-keeping effect is ensured. The low-temperature operation can be maintained for a long time, the long-time storage of food materials is ensured, and the use effect and the user experience of the product are greatly improved. The first evaporator 206 and the second evaporator 207 are separately provided, so that the two evaporators can be prevented from being mutually influenced in temperature, and the evaporators can be prevented from being large in size and occupying a large space, so that the storage space becomes small. The second evaporator 207 is wound around two side walls, a top wall and a bottom wall of the inner container 301, so that the second evaporator 207 is uniformly wound around four sides (up-down and left-right sides) of the inner container 301, and when the second evaporator 207 works, cold energy is transferred to food from the periphery of the box 101, and direct cooling efficiency is remarkably improved.

It will be appreciated that a first damper assembly is provided at the return air duct 204 which is capable of opening and closing the evaporation chamber 203 in response to the temperature thereof, and a second damper assembly is provided at the inlet air duct 205 which is capable of opening and closing the evaporation chamber 203 in response to the temperature thereof. Thus, when the refrigerator is normally cooled, the first air door assembly and the second air door assembly are opened, cooled air flows into the storage compartment 202 through the air inlet channel 205, and flows back to the evaporating cavity 203 from the air return channel 204, so that circulation is realized. When defrosting is required, the heater is turned on, so that the first air door assembly and the second air door assembly are closed, and heated hot air is prevented from flowing into the storage compartment 202. And the second evaporator 207 is turned on, with the result that the inside of the storage compartment 202 is always kept at a certain temperature.

Referring to fig. 4, it can be understood that the air duct component 201 includes an air duct rear cover 401, a foam rear cover 402, a foam front seat 403, and an air duct front plate 404, and the air duct rear cover 401 and the air duct front plate 404 are combined to form a space for accommodating the foam front seat 403 and the foam rear cover 402, and the air return duct 204 penetrates the air duct rear cover 401, the foam front seat 403, and the air duct front plate 404. By providing the foam rear cover 402 and the foam front seat 403, the heat insulation effect of the air duct component 201 is better, and the heat transfer between the storage compartment 202 and the evaporation cavity 203 can be better insulated. The air duct rear cover 401 is covered on the air duct front plate 404, and the air duct rear cover 402 and the air duct front plate are fixedly installed, and the foam rear cover 402 and the foam front seat 403 are wrapped in the air duct rear cover, so that the foam rear cover 402 and the foam front seat 403 are well installed, the foam rear cover 402 and the foam front seat 403 are protected, and the foam rear cover 402 and the foam front seat 403 are not easy to break. Wherein the air duct rear cover 401 is located at a side of the air duct member 201 near the evaporation chamber 203, and the air duct front plate 404 is located at a side of the air duct member 201 near the storage compartment 202.

Referring to fig. 4-7, it will be appreciated that the first damper assembly includes a drive structure 405 and a shutter 406, the drive structure 405 being configured to drive the shutter 406 to close or open the return air channel 204. The driving structure 405 is installed between the foam back cover 402 and the foam front seat 403, and the shielding member 406 is installed between the foam front seat 403 and the air duct front plate 404, so that the installation position can be conveniently set, and the space of the storage compartment 202 and the evaporation cavity 203 is not additionally occupied, so that the space can be saved as a whole. The return air path is: passes through the tunnel front plate 404, then through the shield 406, then through the foam front seat 403, the foam back cover 402, and finally out of the foam back cover 402.

It will be appreciated that the air duct rear cover 401 is located on the side of the drive structure 405 adjacent to the heater, and that the air duct rear cover 401 is provided with heat transfer holes (not shown) adjacent to the heater, and the memory alloy member 901 is adjacent to the heat transfer holes. Through setting up the heat conduction hole for the temperature in evaporating chamber 203 can be transferred to memory alloy 901 from the heat conduction hole, can sense the temperature variation under the defrosting mode more accurately, thereby more accurately control and get return air passageway 204 open or close, and then make the heat of defrosting reduce the food temperature rise.

Referring to fig. 4, it can be understood that the shielding member 406 is in a grid structure, that is, the shielding member 406 is provided with a plurality of through holes 407, the plurality of through holes 407 are arranged at intervals along a straight line direction, the return air channel 204 is provided with a plurality of air openings 408, and the plurality of air openings 408 are also arranged at intervals along the straight line direction, so that each air opening 408 corresponds to the through hole 407 of each grid structure one by one. Of course, the return air duct 204 may be provided with only one complete larger tuyere 408, and the shutter 406 may be correspondingly provided as a shutter without through holes 407. The arrangement of the shielding member 406 in the grid structure, and the arrangement of the air return channel 204 with the plurality of air openings 408 has the advantages that the shielding member 406 can close or open the air return channel 204 by only moving the distance between two adjacent air openings 408 without moving the distance across the cross section of the whole air return channel 204 in the straight direction under the premise of ensuring the ventilation quantity, thereby shortening the distance and time required for moving the shielding member 406 and improving the efficiency of closing or opening the air return channel 204.

Referring to fig. 8-9, it will be appreciated that the drive structure 405 includes a memory alloy member 901 and a resilient return member 902; wherein the memory alloy member 901 is deformed by sensing the temperature change of the evaporation chamber 203. That is, the shutter 406 is movable left and right with respect to the duct front plate 404, and the memory alloy member 901 and the elastic restoring member 902 provide corresponding power. At normal refrigeration or normal temperature (temperature lower than deformation temperature T) of the refrigerator, the acting force of the memory alloy piece 901 on the shielding piece 406 is smaller than the acting force of the elastic reset piece 902 on the shielding piece 406, and the elastic reset piece 902 drives the shielding piece 406 to move rightwards, so that the return air channel 204 is opened. When the temperature is higher than the deformation temperature T, the memory alloy stretches, and at the moment, the acting force of the memory alloy piece 901 on the shielding piece 406 is higher than the acting force of the elastic reset piece 902 on the shielding piece 406, and the memory alloy piece 901 drives the shielding piece 406 to move leftwards to close the return air channel 204. In other words, the first damper assembly has a first state in which the memory alloy 901 drives the shutter 406 in the first direction and a second state; in the second state, the resilient return 902 drives the shutter 406 in a second direction, the first direction being opposite to the second direction.

Referring to fig. 7 and 9, it will be understood that the driving structure 405 includes a casing 903, a central shaft 904 and a push-pull piece 501, where the central shaft 904 is located in the casing 903, the push-pull piece 501 is sleeved on the central shaft 904 and connected to the shielding member 406, and the memory alloy member 901 and the elastic restoring member 902 are respectively located on two sides of the push-pull piece 501 along the axial direction of the central shaft 904. In some embodiments, a push-pull tab 501 is inserted over the shield 406, the push-pull tab 501 being rigidly connected to the shield 406. The push-pull piece 501 moves left and right along the central shaft 904 under the interaction force of the memory alloy piece 901 and the elastic restoring piece 902.

Referring to fig. 7 and 9, it can be understood that the memory alloy member 901 has a spring structure and is sleeved on the central shaft 904. The elastic restoring member 902 is also a spring structure and is sleeved on the central shaft 904. By arranging the memory alloy piece 901 into a spring structure, the driving force of the memory alloy piece 901 to the push-pull piece 501 is superposed with the deformation force of the memory alloy piece 901 due to temperature change and the elastic deformation force of the spring structure, so that the driving force is larger.

It should be noted that the memory alloy member 901 may be configured in a string structure, and the pulling force of the string structure and the elastic force of the elastic restoring member 902 interact with each other to move the pulling-pushing sheet 501 laterally along the central axis 904.

Referring to fig. 9, it will be appreciated that the housing 903 is provided with a limit boss 905, the limit boss 905 being adapted to abut the push-pull tab 501 to limit the travel of the shutter 406. The limit boss 905 may be designed with a desired stroke S so that the push-pull sheet 501 stays at a predetermined position, that is, the push-pull sheet 501 stays at a position where the return air duct 204 is opened or closed. Specifically, the limiting boss 905 may be a groove disposed in the movable cavity of the housing 903 in which the central shaft 904 is accommodated, or may be a protrusion disposed outside the housing 903.

It will be appreciated that the heater is disposed on the first evaporator 206, and the memory alloy member 901 is disposed near the heater, so that the temperature change in the defrosting mode can be sensed more accurately, and thus the opening or closing of the return air channel 204 can be controlled more accurately, and further the temperature rise of the heat of defrosting to the food can be reduced.

It will be appreciated that the second damper assembly includes a motor, a drive gear and a toothed disc, the toothed disc being circumferentially provided with a plurality of spaced ventilation holes, the motor driving the toothed disc to rotate through the drive gear. When defrosting starts or ends, the main board electrifies motor signals, the motor rotates for one circle to drive the transmission gear to rotate for one circle, teeth matched with the transmission gear are arranged on the toothed disc, fan-shaped ventilation holes are formed in the toothed disc, the ventilation holes are evenly distributed, the number of the ventilation holes is N, and the transmission ratio M of the transmission gear to the toothed disc meets M=2N. For example, the number of the ventilation holes selected in the case of the invention is 3, and the transmission ratio of the transmission gear to the toothed disc is 6. When defrosting is started, the transmission gear rotates clockwise for 360 degrees to drive the gear disc to rotate anticlockwise for 60 degrees (the transmission ratio is 6), and the air inlet channel 205 is changed from original opening to closing. After defrosting is finished, the transmission gear rotates clockwise for 360 degrees to drive the toothed disc to rotate anticlockwise for 60 degrees, the air inlet channel 205 is changed from original closing to opening, and the air inlet channel 205 realizes the cyclic operation of closing-opening-closing.

When the refrigerator is used for defrosting, the closed air inlet channel 205 enables hot water vapor not to run into the storage compartment 202, and heat exchange can only be performed in the enclosed space, so that defrosting efficiency is improved.

It should be noted that, in some embodiments, the first air door assembly may also adopt a structural scheme of the second air door assembly, and the first air door assembly adopts a combination scheme of the memory alloy member 901 and the elastic restoring member 902, which has the advantage that the deformation force of the memory alloy member 901 and the elastic restoring member 902 can be used to control the opening or closing of the return air channel 204, without an additional motor, so that the cost and energy are saved.

Referring to fig. 10 to 12, it may be understood that the return air channel 204 includes an air inlet 1201 and an air outlet 1202 disposed on the air channel member 201, the air inlet 1201 is located on a side of the return air channel 204 close to the storage compartment 202, that is, an air inlet end, and the air outlet 1202 is located on a side of the return air channel 204 close to the evaporation cavity 203, that is, an air outlet end, where the air inlet 1201 and the air outlet 1202 are staggered in the vertical direction, that is, the air inlet 1201 and the air outlet 1202 are not at the same height, so that the return air channel 204 is in a zigzag arrangement, and hot air cannot radiate directly, thereby reducing the influence of heat of defrosting on food temperature rise.

Similarly, the air inlet end and the air outlet end of the air inlet channel 205 are staggered along the air flow direction, so that the air inlet channel 205 is arranged in a zigzag manner, hot air cannot be directly radiated, and further the influence of heat of defrosting on food temperature rise is reduced.

The embodiment of the present application provides a control method of a refrigeration device, which can be applied to fig. 1 to 12 and any one of the foregoing embodiments provides a refrigerator, and in another embodiment, the method of the present application can also be applied to other types of refrigeration devices, such as a refrigerator, a container refrigerator, a freezer, etc., and the embodiment of the present application does not limit the types of refrigeration devices. In an embodiment, the control method of the refrigeration apparatus provided in the application embodiment may be performed by a controller of the refrigeration apparatus, for example, by a controller on a control circuit board. In an embodiment, the controller may be electrically connected to each control component of the refrigerator in the foregoing embodiment, for example, the controller may be connected to the first valve, the second valve, the motor of the second damper assembly, the compressor, and the blower, so as to coordinate the working logic of each component in the refrigerator, and implement control in different control stages.

Referring to fig. 14, a control method of a refrigeration device according to an embodiment of the present application includes the following steps:

In step 1401, the refrigeration appliance is controlled to enter a defrosting phase.

During the actual working process, the refrigeration equipment can have different working phases, and can also be called to enter different working states, such as a normal refrigeration phase, a rapid refrigeration phase, a defrosting phase and the like. The controller controls different components in the refrigeration equipment to work cooperatively, so that the refrigeration equipment enters a preset working stage. In this step, the controller controls the refrigeration equipment to enter a defrosting stage in which the controller controls the components in the refrigeration equipment to work in concert to remove frost on the first evaporator. The controller may automatically control the refrigeration device to enter the defrosting stage according to the working state of the refrigeration device, for example, by monitoring the current working state (such as temperature, humidity, refrigeration effect, etc.) of the refrigeration device, judging the frosting degree of the refrigeration device, and automatically controlling the refrigeration device to enter the defrosting stage according to the frosting degree. After the refrigeration equipment enters different working phases, different preset control flows are executed, and in the step, the controller controls the refrigeration equipment to enter a defrosting phase, namely, the defrosting control flow is started.

Step 1402, controlling the air duct assembly to close the communication air duct between the storage compartment and the evaporation cavity of the refrigeration equipment.

In the step, the controller controls the air duct component to be closed in the defrosting stage so as to close the communication air duct between the storage compartment and the evaporation cavity of the refrigeration equipment. In an embodiment, referring to fig. 2, the first evaporator 206 is located in the evaporation chamber 203 and is configured to cool the storage compartment 202 by air cooling, and in an embodiment, in a normal cooling stage, an air flow may be generated by an air supply device (for example, a fan in the above-mentioned refrigerator embodiment) disposed in the refrigerator, and the air flow brings the cooling capacity generated by the first evaporator 206 into the communication air duct and then enters the storage compartment 202. In the defrosting stage, in order to make the first evaporator 206 perform defrosting better, the air duct assembly is controlled to close the communication air duct between the storage compartment and the evaporation cavity of the refrigeration equipment, so that the influence of heat generated by heating of the heater on the storage compartment 202 can be reduced, and the defrosting effect of heating the first evaporator 206 can be improved because the heat dissipation in the evaporation cavity can be effectively prevented. In one embodiment, the air duct assembly may adopt the first air door assembly or the second air door assembly shown in fig. 4 to 7, in another embodiment, the air duct assembly may also include the first air door assembly and the second air door assembly, the communication air duct includes the air inlet duct 205 and the air return duct 204, wherein the first air door assembly is disposed in the air return duct 204, the second air door assembly is disposed in the air inlet duct 205, in a normal refrigeration stage, the air inlet duct 205 and the air return duct 204 enable the storage compartment 202 to be communicated with the evaporation cavity 203, the air flow brings the cold energy generated by the first evaporator 206 into the air inlet duct 205, then enters the storage compartment 202, flows back to the evaporation cavity 203 from the air return duct 204, so as to realize circulation, and the controller controls the communication air duct between the storage compartment and the evaporation cavity by controlling the first air door assembly and the second air door assembly to be closed. In one embodiment, the controller may directly control the air duct assembly, for example, the air duct assembly includes a vent hole selected by the motor, so that the controller may directly control the rotation of the motor to close and open the air duct assembly. In another embodiment, the controller may indirectly control the air duct assembly, for example, the air duct assembly includes a memory alloy member 901 that deforms in response to a temperature change of the evaporation chamber, and the memory alloy member 901 controls the closing and opening of the air duct assembly by changing a force applied to the shielding member 406, so that the controller may control the temperature of the evaporation chamber through the heater, thereby changing the force applied to the shielding member 406 by the memory alloy member 901, and realizing the indirect control of the air duct assembly.

Step 1403, controlling the second evaporator to be turned on, so that the second evaporator supplies cold to the storage compartment in a direct cooling manner.

In this step, the controller controls the second evaporator to be turned on in the defrosting stage, so that the second evaporator supplies cold to the storage compartment in a direct cooling manner. In one embodiment, the controller may open a second valve in the second circuit to effect the second evaporator to turn on. In an embodiment, the second evaporator is in a closing device before entering the defrosting stage, for example, in a normal refrigeration stage, the first evaporator is used for cooling the storage compartment by air cooling, so that the working requirement (such as the requirement of refrigeration, freezing or deep cooling) in the normal refrigeration stage can be met, and then the second evaporator is in a closing state and is started only after entering the defrosting stage, and the first evaporator is not working in the defrosting stage and cannot supply cooling for the storage compartment, so that the temperature rise of food in the storage compartment is prevented from being limited in the defrosting stage, and the second evaporator maintains the cooling of the storage compartment by direct cooling. In another embodiment, the second evaporator may be in an on state prior to entering the defrost phase, e.g., the refrigeration appliance is in a flash refrigeration phase prior to entering the defrost phase, where the first evaporator and the second evaporator are simultaneously on, such that the controller controls the second evaporator to remain on (e.g., keeps the second valve in the second circuit open) during the defrost phase.

In an embodiment, the second evaporator may be configured as shown in fig. 3 in the above embodiment of the refrigerator, that is, the second evaporator 207 is disposed on the outer wall of the inner container 301, for example, includes an evaporation tube, where the evaporation tube is wound on two side walls, a top wall and a bottom wall of the inner container 301, and may be spirally wound, or other winding manners. Alternatively, the second evaporator 207 is a tube-sheet evaporator, and is disposed on two side walls, a top wall, and a bottom wall of the liner 301. It can be appreciated that the second evaporator 207 supplies cold to the storage compartment 202 in a direct cooling manner, so that the second evaporator 207 can be prevented from frosting faster, the fluctuation of the temperature of the compartment is prevented from being smaller when frequent frosting is required, and the food fresh-keeping effect is ensured. The low-temperature operation can be maintained for a long time, the long-time storage of food materials is ensured, and the use effect and the user experience of the product are greatly improved.

Step 1404, controlling the first evaporator to be turned off and controlling a heater to defrost the first evaporator.

In this step, the controller controls the first evaporator to be turned off in the defrosting stage, and in an embodiment, the controller may turn off the first valve in the first loop and turn off the freezing fan to turn off the first evaporator. After the first evaporator is closed, the first evaporator stops cooling the storage compartment in an air cooling mode, and the controller controls the heater to be opened so as to defrost the first evaporator, wherein the heater can adopt an electric heating wire heater, a PCT heater or a high-temperature refrigerant introduced into the compressor to heat the first evaporator. In one embodiment, the first evaporator may be turned off and the heater may be turned on at the same time, or in another embodiment, the first evaporator may be turned off and then the heater may be turned on, or the heater may be turned on and then the first heater may be turned off.

Incidentally, in the embodiment of the present application, the execution sequence of the steps 1402, 14303, and 13404 is not limited, and the execution sequence of the steps 1402, 1403, and 1404 may be adjusted, or a plurality of the steps may be executed simultaneously. For example, the second evaporator may be turned on before the air duct assembly is turned off, or the second evaporator may be turned on while the air duct assembly is turned off after the first evaporator is turned off.

According to the control method of the refrigeration equipment, in the defrosting stage, the control air duct component closes the communication air duct of the storage compartment and the evaporation cavity of the refrigeration equipment, so that the influence on the storage compartment after the heater is heated is reduced, the defrosting efficiency is improved, and the energy-saving and high-efficiency effects are achieved. And the second evaporator is started to maintain the cooling of the storage compartment in a direct cooling mode, so that the temperature rise of defrosting heat to food can be effectively avoided.

In some embodiments, as shown in fig. 15, before the step 1401, the method further includes the following steps:

in step 1501, the refrigeration appliance is controlled to enter a dehumidification pre-cooling stage.

In the step, the controller controls the refrigeration equipment to enter a dehumidifying and precooling state. Since a large amount of water exists in the food, more water vapor exists in the storage compartment after the food is placed in the storage compartment, and if the second evaporator is used for cooling the storage compartment in a direct cooling manner in the step 1403, the water in the storage compartment is easy to condense into frost. In order to avoid the occurrence of the above situation, before the refrigeration equipment enters the defrosting stage, the refrigeration equipment is controlled to enter a dehumidifying and precooling stage firstly, on one hand, the moisture in the storage compartment is dehumidified, and on the other hand, the interior of the storage compartment can be precooled, so that the temperature in the storage compartment is reduced, and the second evaporator is more convenient to maintain the cooling of the storage compartment in the defrosting stage in a direct cooling mode. In an embodiment, the controller may automatically enter a dehumidifying and pre-cooling stage, such as temperature, humidity, and cooling effect, according to the working state of the refrigeration device. In another embodiment, the controller may control the refrigeration device to enter a dehumidification and pre-cooling stage according to a function to be executed by the refrigeration device, for example, when the controller detects that a defrosting process is to be executed, the controller first controls the refrigeration device to enter the dehumidification and pre-cooling stage to dehumidify and pre-cool the storage compartment, and after the dehumidification and pre-cooling stage is completed, the controller controls the refrigeration device to enter the defrosting stage.

In step 1502, the air duct assembly is controlled to open the communication air duct between the storage compartment and the evaporation cavity.

In this step, contrary to step 1402 in the above embodiment, the controller controls the opening of the control air duct assembly during the dehumidification and pre-cooling stage to open the communication air duct between the storage compartment and the evaporation chamber of the refrigeration apparatus. In one embodiment, referring to fig. 2, an air flow may be generated by an air supply device (e.g., a fan in the refrigerator embodiment described above) disposed in the refrigerator, and the air flow may bring the cold energy generated by the first evaporator 206 into the communication air duct and then into the storage compartment 202. In one embodiment, the controller controls the air duct assembly to remain in an open state if the air duct assembly of the present refrigeration appliance has been previously in an open state. Of course, similar to the above step 1402, the controller may also indirectly control the opening of the air duct assembly, for example, the controller may control the first evaporator to be started, and control the heater to be turned off or kept off, so as to control the temperature of the evaporation chamber 203 to be in a lower state, so that the acting force applied by the memory alloy member 901 to the shielding member 406 can be changed, and thus the opening of the air duct assembly is indirectly controlled.

In step 1503, the second evaporator is controlled to be turned off and the first evaporator is controlled to be turned on, so that the cooling mode is used for cooling the storage compartment, and the water vapor in the storage compartment is condensed on the first evaporator.

In the step, the controller controls the second valve to be closed, the first valve to be opened so as to close the second evaporator and controls the first evaporator to be opened, and the air cooling mode is used for cooling the storage compartment.

In one embodiment, the step 1503 specifically includes the following steps:

and controlling the first evaporator and the second evaporator to be simultaneously started so as to pre-cool the second evaporator, and maintaining the cooling of the storage compartment through the first evaporator in the process of pre-cooling the second evaporator.

In this step, since the temperature of the second evaporator needs to be started and operated for a certain period of time in accordance with the direct cooling requirement, the first evaporator is not immediately turned off after the refrigeration device enters the defrosting stage, but the first evaporator and the second evaporator are kept on for a period of time at the same time, so that the cooling of the storage compartment or the precooling of the storage compartment is maintained in an air cooling manner through the first evaporator in the precooling process of the second evaporator. In an embodiment, under the condition that the heat exchange device is arranged on the refrigeration equipment, the first evaporator and the second evaporator operate simultaneously, and the refrigerant output by the first evaporator and the second evaporator can precool the refrigerant in the third refrigerant passage, so that the refrigeration effect of the second evaporator is improved, and the second evaporator can reach the direct-cooling temperature requirement more quickly. In one embodiment, the first evaporator and the second evaporator are turned on simultaneously for 5 minutes, and then the first evaporator is turned off.

Accordingly, the step 1504 includes the steps of:

and after the precooling of the second evaporator is finished, controlling the first evaporator to be closed, and controlling the heater to defrost the first evaporator.

In this step, the pre-cooling of the second evaporator may be determined by a preset operation time or by detecting an operation state of the refrigeration device, for example, after the second evaporator is operated for 5 minutes, the pre-cooling of the second evaporator is considered to be completed, or the second evaporator is cooled to a preset temperature to confirm that the pre-cooling of the second evaporator is completed, or the storage compartment is cooled to a preset temperature to confirm that the pre-cooling of the second evaporator is completed. After the precooling of the second evaporator is finished, the first evaporator is closed, the second evaporator is kept in a starting state, at the moment, the second evaporator keeps the cooling of the storage compartment in a refrigerating mode, the controller controls the air duct component to be closed, and the heater is controlled to start defrosting of the first evaporator.

Referring to fig. 16a, in one embodiment, the step 1402 specifically includes the following steps;

in step 1601, the second damper assembly is controlled to close the air inlet duct.

In step 1603, the first damper assembly is controlled to close the return air duct.

In this embodiment, the first air door assembly is used for closing the return air duct, and the second air door assembly is used for closing the air inlet duct, that is, in this embodiment, the controller controls the air inlet duct to be closed first and then controls the return air duct to be closed. Referring to fig. 2, the air flow brings the cold generated by the first evaporator 206 into the air inlet channel 205, then enters the storage compartment 202, and flows back to the evaporation cavity 203 from the air return channel 204, thereby realizing circulation. Therefore, in this embodiment, the air inlet duct is closed first, so as to prevent cold air from entering the storage compartment through the air inlet duct 205, and then return air in the storage compartment can enter the evaporation cavity through the return air duct. In one embodiment, the first damper assembly is a temperature-controlled memory alloy member, so the controller controls the second damper assembly to be closed first, and then controls the heater to heat the first evaporator, and in the heating process, the temperature of the evaporation cavity rises, so that the deformation of the memory alloy member is controlled, and the first damper assembly is closed.

Referring to fig. 16b, in another embodiment, the refrigeration apparatus further includes an air supply device for supplying air to the storage compartment, where the step 1402 specifically includes the following steps;

Step 1602, controlling the air supply device to be closed;

In this embodiment, the air supply device includes a fan for generating an air flow to bring the cooling capacity generated by the first evaporator into the air intake passage. In an embodiment, the controller controls the second air door assembly to be closed firstly, then controls the air supply device to be closed, and controls the heater to heat the first evaporator after the air supply device is closed, so that the temperature of the evaporating cavity rises in the heating process, and further controls the deformation of the memory alloy piece to close the first air door assembly.

Referring to fig. 17, after the heater completes heating and defrosting the first evaporator in the defrosting stage of the refrigeration equipment, the following steps of exiting the defrosting stage are further included:

at step 1701, the heater is controlled to be turned off.

In this step, the controller controls the heater to be turned off to stop heating the first evaporator. In one embodiment, the controller may control the heater to be turned off in a timed manner, for example, after 20 minutes of heating by the heater. Or the controller judges the defrosting state of the first evaporator by detecting the temperature of the first evaporator or the evaporating cavity, and then controls the heater to be turned off.

In step 1702, the first evaporator is controlled to turn on.

In the step, the controller controls the first valve to be opened, so as to control the first evaporator to be opened, and the air cooling mode is used for cooling the storage compartment. In one embodiment, the step 1701 may be performed after the step 1701 is performed, however, in another embodiment, the steps 1701 and 1702 may be performed simultaneously, i.e. the heater is turned off and the first evaporator is turned on. In an embodiment, the controller may further control the air supply device to start in coordination with the start of the first evaporator, and supply air to the storage compartment.

In step 1703, the second evaporator is controlled to be turned off.

In this step, the controller controls the second valve to close so that the second evaporator is closed, and when the second evaporator is closed, the controller stops cooling the storage compartment in a direct cooling mode.

In step 1704, the air duct assembly is controlled to open a communication air duct between the storage compartment and the evaporation cavity.

In this step, contrary to step 1402 in the above embodiment, the controller controls the air duct assembly to open the communication air duct, so that the storage compartment is in copper communication with the evaporation chamber. After the communication air duct is opened, the first evaporator can supply cold to the storage compartment through the communication air duct in an air cooling mode. In an embodiment, the air duct assembly may employ the first air door assembly or the second air door assembly shown in fig. 4 to 7, in which the controller may directly control the motor in the second air door assembly to realize the opening of the second air door assembly, in addition, the controller may indirectly control the first air door assembly, for example, the first air duct assembly includes a memory alloy element 901 that senses the temperature change of the evaporation chamber to deform, and the memory alloy element 901 controls the closing and opening of the air duct assembly by changing the acting force applied to the shielding element 406, so that after the step 1702 and/or the step 1703 are performed, the temperature in the evaporation chamber is reduced, and thus the memory alloy element is changed, by changing the acting force applied to the shielding element 4, the elastic reset element drives the shielding element to move along the reset, so as to realize the opening of the first air door assembly.

In one embodiment, the step 1703 specifically includes the following steps:

and controlling the first evaporator and the second evaporator to be simultaneously started so as to pre-cool the first evaporator, and maintaining cooling of the storage compartment through the second evaporator in the process of pre-cooling the first evaporator.

In this step, since the temperature of the first evaporator needs to be started and operated for a certain period of time in accordance with the air cooling requirement, the second evaporator is not immediately turned off when the refrigeration device is ready to exit the defrosting stage, but the second evaporator and the first evaporator are kept on for a period of time at the same time, so that the cooling of the storage compartment is maintained in a direct cooling manner through the second evaporator during the pre-cooling of the first evaporator.

In an embodiment, under the condition that the heat exchange device is arranged on the refrigeration equipment, the first evaporator and the second evaporator operate simultaneously, and the refrigerant output by the first evaporator and the second evaporator can precool the refrigerant in the first refrigerant passage, so that the refrigeration effect of the first evaporator is improved, and the first evaporator can reach the direct-cooling temperature requirement more quickly. In one embodiment, the first evaporator and the second evaporator are turned on simultaneously for 5 minutes, and then the second evaporator is turned off.

Referring to fig. 18, an embodiment of the present application provides a control method of a refrigeration device, further including the following steps:

in step 1801, the refrigeration device is controlled to enter an enhanced refrigeration phase.

In step 1802, the first evaporator and the second evaporator are controlled to be turned on simultaneously, so that the first evaporator is cooled by air cooling to cool the storage compartment and the second evaporator is directly cooled to cool the storage compartment.

In this embodiment, the controller controls the refrigeration device to enter a reinforced refrigeration stage, and in the reinforced refrigeration stage, the first evaporator is used to cool the storage compartment in an air cooling manner, and the second evaporator is used to cool the storage compartment in a direct cooling manner. In an embodiment, the method can be applied to fast refrigeration of the storage compartment, namely, the first evaporator and the second evaporator work simultaneously, so that the time for cooling the storage compartment to the target refrigeration temperature is shortened, fast refrigeration is realized, after the storage compartment is cooled to the target refrigeration temperature, the second evaporator can be closed, and only the first evaporator is used for cooling the storage compartment in an air cooling mode, so that frosting in the storage compartment can be avoided. In another embodiment, the refrigerator can be applied to forcefully refrigerating the storage compartment, namely, the first evaporator and the second evaporator work simultaneously all the time, and the temperature in the storage compartment is reduced to a lower temperature, so that the requirement of a user for storing food materials in a deep cooling mode is met.

Referring to fig. 19, an operation process and an embodiment of a usage scenario before and after the refrigerator enters the defrosting stage will be described with reference to the flowchart shown in fig. 19.

The refrigerator is in a normal refrigeration state, at this time, the first evaporator is opened, the second evaporator is closed, the first air duct component and the second air duct component are opened, the first evaporator is used as main refrigeration to cool the storage compartment in an air cooling manner, wherein, as shown in fig. 13, the refrigerant output by the first evaporator 206 enters the second refrigerant channel 1311, because the first refrigerant channel 1310 and the second refrigerant channel 1311 are at least partially arranged on the heat exchange device 1308, the cold energy of the refrigerant in the second refrigerant channel 1311 can pre-cool the refrigerant in the first refrigerant channel 1310, in an embodiment, the refrigerating system uses a mixed refrigerant, wherein, the first refrigerant and the second refrigerant are included, the boiling point of the first refrigerant is higher than the boiling point of the second refrigerant, the mixed refrigerant is liquefied after passing through the condenser 1302, and still remains in a gaseous state because the boiling point of the second refrigerant is low, and the cold energy of the refrigerant in the second refrigerant channel 1311 can liquefy the second refrigerant in the mixed refrigerant when passing through the heat exchange device 1308, so that the second refrigerant 206 enters the first evaporator 206 to be changed into a liquid state, and the refrigerating effect can be realized as the main refrigeration effect when the first evaporator 206 is also cooled by the first evaporator. Under normal refrigeration conditions, the first evaporator 206 will continuously condense moisture in the storage compartment, causing the first evaporator to frost.

When a user opens the refrigerator door body to put food, a part of water vapor is brought into the storage compartment, so that before entering a defrosting stage, the controller controls the refrigerator to enter a dehumidification precooling stage, at the moment, the first evaporator 206 is opened, the second evaporator 207 is closed, the first air duct component and the second air duct component are opened, the first evaporator 206 supplies cold for the storage compartment in an air cooling mode, and because the temperature of the first evaporator 206 is lower, the storage compartment is communicated with the evaporation cavity and forms air circulation, water vapor in the storage compartment can be condensed on the first evaporator 206 to form frosting, and the water vapor in the storage compartment can be removed.

After the dehumidification and precooling phases are completed, the controller controls the refrigerator to enter a defrosting phase, wherein when the defrosting condition is reached, the controller controls the refrigerator to enter the defrosting phase, the refrigerator is in a defrosting process, as the second evaporator 207 needs a certain time to reach the temperature required by direct cooling, the controller controls the first evaporator 206 and the second evaporator 207 to be simultaneously opened, the compressor and the air supply device continuously work, in the cooling process of the second evaporator 207, the cooling of the storage compartment is maintained in an air cooling mode through the first evaporator 206, and as the first evaporator 206 and the second evaporator 207 are simultaneously opened, the refrigerants output by the first evaporator 206 and the second evaporator 207 can precool the mixed refrigerants in the third refrigerant channel 1312 in the heat exchange device 1308, so that the second refrigerants in the mixed refrigerants are liquefied, and the second evaporator 207 is further cooled to the temperature required by direct cooling more quickly. In one embodiment, the first evaporator 206 and the second evaporator 207 are activated simultaneously for 5 minutes. When the precooling of the second evaporator 207 is completed, the controller controls the second air door assembly to close the air inlet duct 205, and then controls the air supply device to close, and as the air supply device is closed, the temperature of the evaporation cavity rises to be higher than the deformation temperature T, so that the acting force of the memory alloy piece of the first air door assembly to the shielding piece is higher than the acting force of the elastic resetting piece to the shielding piece, so that the first air door assembly closes the return air duct 204, and at the moment, the evaporation cavity 203 is sealed to form a sealed small space, so that on one hand, the heat convection between the evaporation cavity 203 and the storage compartment 202 can be blocked, and on the other hand, the hot air utilization of the evaporation cavity 203 can be improved, the defrosting efficiency can be improved, and the defrosting time can be shortened. After the first air door assembly and the second air door assembly are closed, the controller controls the first valve 1304 to be closed, so that the first evaporator 206 is closed, the controller controls the heater to start defrosting the first evaporator 206, the second evaporator 207 is still normally opened in the process, and the cooling of the storage compartment 202 is maintained in a direct cooling mode, so that the temperature rise of the storage compartment 202 is avoided.

In the process of defrosting the first evaporator 206 by the heater, the controller determines whether the first evaporator 206 is completely defrosted, wherein whether the first evaporator 206 is completely defrosted may be determined by detecting the temperature of the first evaporator 206 or the temperature of the evaporating cavity 203, or in another embodiment, a preset fixed heating time may be also used. When the controller determines that the first evaporator 206 has completed defrosting, the heater is turned off, and then the first evaporator 206 is pre-cooled, at this time, the second valve 1305 is kept open while the first valve 1304 is controlled to be opened, so that the first evaporator 206 is turned on in the process of keeping the second evaporator 207 open, wherein the second evaporator 207 continues to keep the cooling of the storage compartment 202 in a direct cooling manner, and the first evaporator 206 and the second evaporator 207 are simultaneously turned on, so that the refrigerants output by the first evaporator 206 and the second evaporator 207 can pre-cool the mixed refrigerant in the first refrigerant channel 1310 in the heat exchange device 1308, so that the second refrigerant in the mixed refrigerant is liquefied, and the first evaporator 206 is further cooled to a temperature required by air cooling. In one embodiment, the first evaporator 206 and the second evaporator 207 are activated simultaneously for 5 minutes. After the first evaporator 206 is precooled, the controller controls the air supply device and the second air door assembly to be opened, the first evaporator 206 supplies cold to the storage compartment 202 through the air inlet duct 205, the first evaporator 206 and the air supply device are started, the temperature in the evaporation cavity 202 is reduced to be lower than the deformation temperature T of the memory alloy piece, therefore, the acting force of the memory alloy piece on the shielding piece at the moment of the first air door assembly is smaller than the acting force of the elastic reset piece on the shielding piece, the first air door assembly is made to open the air return duct 204, the storage compartment 202 is communicated with the evaporation cavity 203 and forms air circulation, and the refrigerator exits from a refrigerating stage and enters a normal refrigerating stage.

When the controller receives a rapid refrigeration instruction (for example, an instruction sent by a user or an intelligent home system), the refrigerator enters a rapid refrigeration stage, and the controller controls the first valve 1304 and the second valve 1305 to be opened simultaneously, so that the first evaporator 206 and the second evaporator 207 work simultaneously, the time for the storage compartment 202 to be cooled to the target refrigeration temperature is shortened, rapid refrigeration is realized, after the storage compartment 202 is cooled to the target refrigeration temperature, the second evaporator 207 can be closed, and only the first evaporator 206 is used for cooling the storage compartment 202 in an air cooling mode, so that frosting in the storage compartment can be avoided.

When the controller receives the command of strong refrigeration, the refrigerator enters the stage of strong refrigeration, namely, the first evaporator 206 and the second evaporator 207 work simultaneously all the time, and the interior of the storage compartment 202 is reduced to a lower temperature, so that the requirement of a user for storing food materials in a deep cooling mode is met.

The embodiment of the application provides a refrigeration device, which comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the control method of the refrigeration equipment provided by the embodiment when executing the computer program.

The embodiment of the application provides a refrigerator, which comprises the refrigerating device provided by the embodiment.

The embodiment of the application provides a defrosting control device, which comprises a memory, a processor and a defrosting control program stored on the memory and used for running a refrigerating device on the processor, wherein the control method of the refrigerating equipment provided by the embodiment is realized when the processor executes the defrosting control program of the refrigerating device.

The embodiment of the application provides a computer storage medium, on which a computer program is stored, applied to a refrigeration device, and the computer program when executed by a processor realizes the control method of the refrigeration device according to the embodiment.

Embodiments of the present application provide a computer program product or computer program comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the control method of the refrigeration device according to the above-described embodiment.

The embodiment of the present application also provides a refrigeration system, which can be applied to the refrigeration device or the refrigerator in the above embodiment, and referring to fig. 13, the refrigeration system in the embodiment of the present invention includes a first circuit and a second circuit.

The first loop comprises a first evaporator and a first valve, the first loop further comprises a first refrigerant passage for conveying a refrigerant to the first evaporator and a second refrigerant passage for outputting the refrigerant by the first evaporator, and the first evaporator is used for cooling the storage compartment in an air cooling mode. The second loop comprises a second evaporator and a second valve, the second loop also comprises a third refrigerant passage for conveying the refrigerant to the second evaporator and a fourth refrigerant passage for outputting the refrigerant by the second evaporator, and the second evaporator is used for cooling the storage compartment in a direct cooling mode. In one embodiment, the first circuit and the second circuit share a single compressor and condenser.

The refrigerants flowing in the first loop and the second loop are mixed refrigerants, and the mixed refrigerants comprise a first refrigerant and a second refrigerant, wherein the boiling point of the first refrigerant is higher than that of the second refrigerant, in one embodiment, the first refrigerant can be R600a type refrigerant, and the second refrigerant can be R170 or 1150 type refrigerant.

The refrigeration system also comprises a heat exchange device, wherein the heat exchange device is used for pre-cooling the mixed refrigerant which is ready to be input into the evaporator. In an embodiment, at least a portion of the first refrigerant passage, the second refrigerant passage, the third refrigerant passage and the fourth refrigerant passage are disposed in the heat exchange device, wherein the first refrigerant passage and the third refrigerant passage are respectively used for conveying mixed refrigerant to the first evaporator and the second evaporator, and the second refrigerant passage and the fourth refrigerant passage are respectively used for bearing the refrigerant output by the first evaporator and the second evaporator so as to enable the refrigerant to flow back to the air inlet of the compressor. Because the refrigerants output by the first evaporator and the second evaporator still have a certain cold quantity, the refrigerants can be utilized by the heat exchange device to precool the refrigerants which do not enter the evaporators in the first refrigerant passage and the third refrigerant passage.

In another embodiment, independent heat exchange devices may be respectively provided to realize heat exchange between the first refrigerant passage and the second refrigerant passage, and heat exchange between the third refrigerant passage and the fourth refrigerant passage. In other words, at least one of the first refrigerant passage and the third refrigerant passage is configured to be at least partially disposed in the heat exchange device, and at least one of the second refrigerant passage and the fourth refrigerant passage is configured to be at least partially disposed in the heat exchange device. For example, the first refrigerant passage and the second refrigerant passage may be provided in the same heat exchange device, and the third refrigerant passage and the fourth refrigerant passage may be provided in another heat exchange device. In an embodiment, in order to improve the air cooling and rapid cooling effects of the first evaporator as much as possible, the first refrigerant passage, the second refrigerant passage and the fourth refrigerant passage may be disposed in the same heat exchange device, and different refrigerant passage combinations may be selected according to needs, which is not listed again.

The refrigeration system also includes a heater for defrosting the first evaporator, and a controller for controlling various components in the refrigeration system. The controller controls the first valve to be closed, controls the second valve to be opened and controls the heater to be opened when the refrigeration system enters the defrosting stage, so that the second evaporator maintains the cooling of the storage compartment in a direct cooling mode in the defrosting process of the heater to the first evaporator.

According to the refrigerating system provided by the embodiment of the application, the first evaporator and/or the second evaporator can be/are/is used for outputting the cold quantity of the cold medium to pre-cool the mixed cold medium in the first cold medium passage through the heat exchange device, the cooling effect of the first evaporator on the storage compartment can be effectively improved, the effect of cryogenic storage can be realized through the first evaporator in an air cooling mode, automatic defrosting can be conveniently carried out due to the fact that the air cooling and cooling mode is mainly carried out on the first evaporator, in the defrosting stage, the second evaporator is controlled to be opened through controlling the second valve, the cooling of the storage compartment is maintained through the direct cooling mode, and the temperature rise of defrosting heat to food can be avoided.

Referring to fig. 13, in an embodiment, the refrigeration system further includes a first throttling device and a second throttling device, and an exhaust port of the compressor, the condenser, the first throttling device, the first evaporator and an air inlet of the compressor are sequentially connected to form a first loop; the exhaust port of the compressor, the condenser, the second throttling device, the second evaporator and the air inlet of the compressor are sequentially connected to form a second loop; the first refrigerant passage is arranged between the first throttling device and the condenser, the second refrigerant passage is arranged between the first evaporator and the air inlet of the compressor, the third refrigerant passage is arranged between the second throttling device and the condenser, and the fourth refrigerant passage is arranged between the second evaporator and the air inlet of the compressor.

In an embodiment, the first valve and the second valve may form an electric control valve assembly, the controller is connected with the electric control valve assembly to control states of the first valve and the second valve, the electric control valve assembly controls a refrigerant flow direction of the condenser output end through the first valve and the second valve, and when the first valve and the second valve are both opened, the condenser output end is simultaneously connected with the first throttling device and the second throttling device, and the first evaporator and the second evaporator are simultaneously opened. When only the first valve is opened, the condenser output end and the first throttling device realize independent opening of the first evaporator. When only the second valve is opened, the condenser output end and the second throttling device realize independent opening of the second evaporator.

In an embodiment, a one-way valve is disposed between the output end of the first evaporator and the output end of the second evaporator. The refrigerant output by the second evaporator can be prevented from flowing back to the first evaporator by arranging the one-way valve, so that the fault of the refrigerating system is further caused.

In one embodiment, the flow rate of the condenser or the refrigerant or the composition of the refrigerant is configured such that after the mixed refrigerant flows through the condenser, the first refrigerant in the mixed refrigerant is in a liquefied state, and the second refrigerant is still in a gaseous state. In the heat exchange device, the cooling capacity of the refrigerant in the second refrigerant passage and/or the fourth refrigerant passage carries out direct cooling and cooling on the second refrigerant in the first refrigerant passage and/or the third refrigerant passage so as to liquefy the second refrigerant. Because the second refrigerant with lower boiling point is also changed into a liquefied state, the second refrigerant can absorb more heat when being changed into a gaseous state through the first evaporator or the second evaporator, and the refrigerating effect of the first evaporator and the second evaporator is further effectively improved.

In an embodiment, the controller controls the refrigeration system to enter a dehumidification and pre-cooling stage, wherein the refrigeration system may be triggered to enter the dehumidification and pre-cooling stage according to an instruction of a user or an intelligent home, or the controller determines that the refrigeration system is to enter the dehumidification and pre-cooling stage through judgment, for example, the controller monitors that the user opens a door body of the refrigeration device to put food into the food, or controls the refrigeration system to enter the dehumidification and pre-cooling stage when the user detects that defrosting is to be performed. In the dehumidifying and precooling stage, the controller controls the second valve to be closed and controls the first valve to be opened so that the first evaporator supplies cold for the storage compartment in an air cooling mode, and because the temperature of the first evaporator is low, the storage compartment is communicated with the evaporation cavity and forms air circulation, water vapor in the storage compartment can be condensed on the first evaporator to form frosting, so that the water vapor in the storage compartment can be removed, frosting is not easily formed in the storage compartment when the second evaporator maintains the cooling of the storage compartment in a direct cooling mode in the defrosting stage, the water vapor in the storage compartment can be melted and discharged by the heater in the defrosting stage, in addition, the first evaporator can also pre-cool the storage compartment and reduce the temperature, the second evaporator maintains the cooling of the storage compartment in a direct cooling mode in the defrosting stage, and larger fluctuation generated when the storage compartment is connected with the first evaporator and the second evaporator is avoided. After the dehumidification and precooling stage is completed, the controller controls the refrigerating system to enter a defrosting stage.

In an embodiment, after the refrigerating system enters the defrosting stage, the first valve and the second valve are controlled to be opened, at this time, the first evaporator and the second evaporator are simultaneously opened to pre-cool the second evaporator, and the cooling of the storage compartment is maintained through the first evaporator in the process of pre-cooling the second evaporator, and as the first evaporator and the second evaporator simultaneously operate, the cooling capacity of the cooling medium in the second cooling medium passage and the fourth cooling medium passage pre-cool the cooling medium in the third cooling medium passage through the heat exchange device, so that the cooling effect of the second evaporator is improved, and the second evaporator can reach the direct cooling temperature requirement more quickly. In one embodiment, the first evaporator and the second evaporator are turned on for 5 minutes at the same time, then the first evaporator is turned off, and the heater is turned on to defrost the first evaporator.

In an embodiment, after defrosting the first evaporator by the heater is completed, the heater is controlled to be closed, the first valve is controlled to be opened, and the second valve is controlled to be closed, so that the first evaporator is used for cooling the storage compartment in an air cooling mode.

In another embodiment, the controller further controls the first valve and the second valve to be opened simultaneously after the heater is closed and before the second valve is closed, so that the cooling capacity of the cooling medium in the second cooling medium passage and the fourth cooling medium passage precools the cooling medium in the first cooling medium passage through the heat exchange device. Because the temperature of the first evaporator needs to be started and operated for a certain time according to the air cooling requirement, when the refrigerating system is ready to exit the defrosting stage, the second evaporator is not closed immediately after the heater is closed, but the first evaporator and the second evaporator are kept on for a period of time at the same time, so that the cooling of the storage compartment is maintained in a direct cooling mode through the second evaporator in the process of precooling the first evaporator. In an embodiment, the refrigerants output by the first evaporator and the second evaporator can precool the refrigerants in the first refrigerant passage, so that the refrigeration effect of the first evaporator is improved, and the first evaporator can reach the air-cooled temperature requirement more quickly. In one embodiment, the first evaporator and the second evaporator are turned on simultaneously for 5 minutes, and then the second evaporator is turned off.

In an embodiment, the refrigerator controls the refrigeration system to enter an enhanced refrigeration stage, and in the enhanced refrigeration stage, the first evaporator is used to cool the storage compartment by air cooling, and the second evaporator is used to cool the storage compartment by direct cooling. In an embodiment, the method can be applied to fast refrigeration of the storage compartment, namely, the first evaporator and the second evaporator work simultaneously, so that the time for cooling the storage compartment to the target refrigeration temperature is shortened, fast refrigeration is realized, after the storage compartment is cooled to the target refrigeration temperature, the second evaporator can be closed, and only the first evaporator is used for cooling the storage compartment in an air cooling mode, so that frosting in the storage compartment can be avoided. In another embodiment, the refrigerator can be applied to forcefully refrigerating the storage compartment, namely, the first evaporator and the second evaporator work simultaneously all the time, and the temperature in the storage compartment is reduced to a lower temperature, so that the requirement of a user for storing food materials in a deep cooling mode is met.

The embodiment of the invention provides refrigeration equipment, which comprises the refrigeration system provided by the embodiment.

The embodiment of the invention provides a refrigerator, which comprises the refrigerating system provided by the embodiment.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of elements is merely a logical functional division, and there may be additional divisions of actual implementation, e.g., multiple elements or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods of the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

It should also be appreciated that the various embodiments provided in the embodiments of the present application may be arbitrarily combined to achieve different technical effects.

The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.

Claims

1. A refrigeration system, comprising:

a heater for defrosting the first evaporator;

2. The refrigeration system of claim 1 further comprising a compressor, a condenser, a first throttling device, and a second throttling device; the exhaust port of the compressor, the condenser, the first throttling device, the first evaporator and the air inlet of the compressor are sequentially connected to form the first loop; the exhaust port of the compressor, the condenser, the second throttling device, the second evaporator and the air inlet of the compressor are sequentially connected to form the second loop; the first refrigerant passage is arranged between the first throttling device and the condenser, the second refrigerant passage is arranged between the first evaporator and the air inlet of the compressor, the third refrigerant passage is arranged between the second throttling device and the condenser, and the fourth refrigerant passage is arranged between the second evaporator and the air inlet of the compressor.

3. The refrigeration system of claim 2, wherein the first valve is disposed between the first throttling device and the condenser and the second valve is disposed between the second throttling device and the condenser.

4. The refrigeration system of claim 2, wherein a one-way valve is disposed between the output of the first evaporator and the output of the second evaporator.

5. The refrigerant system as set forth in claim 1, wherein said first refrigerant is a R600a type refrigerant; the second refrigerant is a refrigerant of R170 or 1150 type.

6. The refrigeration system according to any one of claims 2 to 5, wherein said condenser is configured to liquefy said first refrigerant flowing through said condenser, and said second refrigerant flowing through said condenser is maintained in a gaseous state.

7. The refrigeration system according to claim 6, wherein the heat exchange device is configured to directly cool and cool the second refrigerant in the first refrigerant passage and/or the third refrigerant passage by the cooling capacity of the refrigerant in the second refrigerant passage and/or the fourth refrigerant passage so as to liquefy the second refrigerant.

8. The refrigeration system of claim 1, wherein the controller is further configured to control the second valve to close and the first valve to open during a dehumidification pre-cooling stage to cool the first evaporator in an air-cooled manner to condense moisture in the storage compartment on the first evaporator.

9. The refrigeration system of claim 1 or 2, wherein the controller is further configured to control the first valve and the second valve to open before the heater is turned on during the defrosting phase, so that the cooling capacity of the cooling medium in the second cooling medium passage and the fourth cooling medium passage is precooled by the heat exchange device.

10. The refrigeration system of claim 1, wherein the controller is further configured to control the heater to be turned off, the first valve to be turned on, and the second valve to be turned off after defrosting the first evaporator is completed, so that the first evaporator is used to cool the storage compartment by air cooling.

11. The refrigeration system of claim 10 wherein said controller is further configured to control said first valve and said second valve to open simultaneously after said heater is turned off and before said second valve is turned off, such that the cooling capacity of the refrigerant in said second refrigerant passage and said fourth refrigerant passage pre-cools the refrigerant in said first refrigerant passage through said heat exchange device.

12. The refrigeration system of claim 1, wherein the controller is further configured to control the first valve and the second valve to be simultaneously opened during an enhanced refrigeration phase to cause the first evaporator to cool the storage compartment by air cooling and to cause the second evaporator to cool the storage compartment by direct cooling.

13. A refrigeration system, comprising:

a heater for defrosting the first evaporator;

14. A refrigeration device comprising a refrigeration system according to any one of claims 1 to 13.

15. A refrigerator comprising a refrigeration system according to any one of claims 1 to 13.