WO2021218342A1

WO2021218342A1 - Defrosting control method for refrigerator

Info

Publication number: WO2021218342A1
Application number: PCT/CN2021/078168
Authority: WO
Inventors: 戚斐斐; 宋向鹏; 刘山山
Original assignee: 青岛海尔电冰箱有限公司; 海尔智家股份有限公司
Priority date: 2020-06-05
Filing date: 2021-02-26
Publication date: 2021-11-04
Also published as: CN113758121A; CN113758121B; JP2023528838A; EP4145074A4; EP4145074A1

Abstract

A defrosting control method for a refrigerator. The method comprises: measuring the temperature in a storage space, and determining whether the temperature of the storage space reaches a first preset temperature value during a temperature decreasing process; when the temperature of the storage space reaches the first preset temperature value during the temperature decreasing process, starting a defrosting program to perform defrosting once, wherein the defrosting program comprises a first defrosting program, and the first defrosting program comprises: turning off a low-temperature-level evaporation part, and starting a first defrosting heating apparatus to heat an evaporator; measuring the temperature in the storage space, and determining whether the difference between the temperature of the storage space and the first preset temperature value is greater than a first preset difference; and when the difference between the temperature of the storage space and the first preset temperature value is greater than the first preset difference, closing the first defrosting program, and turning on the low-temperature-level evaporation part. Defrosting can be performed many times in a timely manner, such that refrigeration is not affected by excessive frost, and the nutritional preservation of food is also prevented from being affected by an excessive rise in temperature caused when defrosting.

Description

Defrosting control method of refrigerator

Technical field

The invention relates to the field of refrigeration storage, in particular to a defrosting control method of a refrigerator.

Background technique

At present, the temperature range of the refrigerator variable temperature compartment on the market is mostly adjusted between 8-18°C, and the overall design is more conventional. With the gradual improvement of people’s living standards, this type of temperature zone refrigerator can no longer meet everyone’s needs. It is necessary to design high-end refrigerators with a wider temperature range, more complete functions, and can meet more needs of users. Preservation in a glass state below -40°C is conducive to maximizing the nutritional value of food. There is a demand for ultra-low temperature compartments (-40～-60°C) in the high-end user market to improve user satisfaction and focus on user experience. For this reason, the conventional cascade compression refrigeration system is usually composed of two separate refrigeration cycles, which are called a high-temperature refrigeration cycle (referred to as a high-temperature part) and a low-temperature refrigeration cycle (referred to as a low-temperature part). The high-temperature part uses a first refrigerant with a relatively high evaporation temperature, and the low-temperature part uses a second refrigerant with a relatively low evaporation temperature. A condensing evaporator is used, which uses the cold energy produced by the first refrigerant in the high-temperature part to condense the second refrigerant vapor discharged from the compressor in the low-temperature part, so as to achieve a low temperature below -60°C.

Summary of the invention

The inventor of the present invention found that the existence of a cryogenic compartment is a requirement for the preservation of high-end ingredients. In this case, temperature fluctuations have a more obvious impact on the nutrition of the ingredients. Of course, ingredients such as Boston lobsters are eaten as soon as they are shipped by air. Best, if stored in the refrigerator to ensure that nutrients are not lost, a refrigerator with a cryogenic compartment was developed, because the temperature is significantly lower than that of a conventional refrigerator and if the temperature fluctuates beyond a certain range, it will affect the preservation of nutrients. That is to say, the inventor found that if the evaporator of the cryogenic compartment is not defrosted in time, it will cause excessive frosting to reduce the refrigeration efficiency, affect energy consumption and refrigeration depth, and fail to control temperature fluctuations in time during the defrosting process, which will cause food damage. Nutrition is impaired. Based on this, the present invention proposes a defrosting control method for refrigerators, which can ensure that the refrigeration is not affected by excessive frosting when the cryogenic compartment is defrosted, and at the same time avoid excessive temperature rise caused by defrosting. Affect the nutritional preservation of food.

Specifically, the present invention provides a defrosting control method for a refrigerator. The refrigerator includes a cabinet, an evaporator, a low-temperature refrigeration cycle and a first defrosting heating device, and a storage space is formed inside the cabinet, The evaporator is configured to provide cooling for the storage space, and the evaporator includes a low-temperature evaporator disposed in the low-temperature refrigeration cycle; wherein, the defrosting control method of the refrigerator includes:

When the low-temperature evaporation unit is working, the temperature in the storage space is detected, and it is judged whether the temperature of the storage space reaches a preset temperature range during the process of falling and remains within the preset temperature range for a preset time period , Having a first preset temperature value in the preset temperature range;

When the temperature of the storage space reaches the preset temperature range and remains within the preset temperature range for a preset period of time during the process of falling, the defrosting procedure is started to perform a defrosting; and the defrosting procedure includes a first defrosting procedure; A defrosting procedure;

The first defrosting procedure includes: turning off the low-temperature evaporator, and turning on the first defrosting heating device to heat the evaporator; detecting the temperature in the storage space, and judging the storage Whether the difference between the temperature of the space and the first preset temperature value is greater than the first preset difference; the difference between the temperature in the storage space and the first preset temperature value is greater than the first preset difference Value, the first defrosting program is closed, and the low-temperature evaporator is turned on.

Optionally, the refrigerator further includes a second defrosting heating device; the defrosting program further includes a second defrosting program, and the defrosting control method of the refrigerator further includes:

Record the working time of the low-temperature evaporator between the end of each defrosting and the beginning of the next defrosting;

Judging whether the ratio between the working time of the next time and the working time of the previous time is greater than or equal to a preset ratio, and the preset ratio is greater than 1;

When the ratio between the working time of the next time and the working time of the last time is greater than or equal to the preset ratio, when the defrosting procedure is started, the second defrosting procedure is started, otherwise the first defrosting procedure is started. A defrosting procedure; and

The second defrosting procedure includes: turning off the low-temperature evaporator, and turning on at least the second defrosting heating device to heat the evaporator; detecting the temperature in the storage space, and judging the storage space Whether the difference between the temperature of the object space and the first preset temperature value is greater than the second preset difference; the difference between the temperature of the storage space and the first preset temperature value is greater than the second preset When there is a difference, the second defrosting program is turned off and the low-temperature evaporator is turned on; the second preset difference is greater than the first preset difference.

Optionally, the heating power of the second defrosting heating device is greater than the heating power of the first defrosting heating device, and in the second defrosting procedure, only the second defrosting heating device is turned on, Or turn on the first defrosting heating device and the second defrosting heating device at the same time to heat the evaporator; or,

The heating power of the second defrosting heating device is less than or equal to the heating power of the first defrosting heating device, and in the second defrosting program, the first defrosting heating device and the The second defrost heating device to heat the evaporator.

Optionally, after the cryogenic mode is turned on to make the low-temperature evaporator work, and after the first defrosting procedure is performed at least twice in succession, it is determined whether the working time of the next time is different from the working time of the previous time. Whether the ratio between working hours is greater than or equal to the preset ratio.

Optionally, the defrosting control method of the refrigerator further includes: when the second defrosting program needs to be started, determining whether the time interval between the time and the time when the second defrosting program was started last time It is less than or equal to the preset time interval; if yes, enter the reminding procedure, if not, then proceed to the second defrosting procedure.

Optionally, when entering the reminding program, the second defrosting program is executed at the same time.

Optionally, the reminding program includes: sending reminding information; judging whether a feedback instruction is received; if the feedback instruction is received, performing a corresponding operation according to the feedback instruction.

Optionally, if the feedback instruction is not received, the second defrosting procedure is performed when the defrosting procedure is subsequently performed.

Optionally, the refrigerator further includes a high-temperature refrigeration cycle, and the evaporator includes a high-temperature evaporator disposed in the high-temperature refrigeration cycle; the feedback instruction includes that the low-temperature evaporator is to be operated The deep cooling mode is switched to a normal cooling mode that makes the high-temperature stage evaporator work.

Optionally, executing the corresponding operation according to the feedback instruction includes: turning on the first defrosting heating device and/or the second defrosting heating device.

Optionally, performing the corresponding operation according to the feedback instruction further includes: when the temperature of the storage space rises to a second preset temperature value, and/or the temperature of the evaporator rises to a third preset temperature When the value is set, the first defrosting heating device and/or the second defrosting heating device are turned off, and the high-temperature evaporator is controlled according to the temperature in the storage space to perform the normal cooling mode.

Optionally, performing a corresponding operation according to the feedback instruction includes: turning on the first defrosting heating device and the second defrosting heating device, and when the temperature of the storage space rises to a fourth preset temperature value , Turn off the second defrosting and heating device, turn off the first defrosting and heating device when the temperature of the storage space rises to a fifth preset temperature value, and control all devices according to the temperature in the storage space The high-temperature evaporating part is used to perform the conventional cooling mode; the fifth preset temperature value is higher than the fourth preset temperature value.

Optionally, in the process of performing the conventional cooling mode, a corresponding conventional defrosting procedure may be performed.

In the defrosting control method of the refrigerator of the present invention, the defrosting temperature change limit is set, and the defrosting can be performed multiple times in time, which not only ensures that refrigeration is not affected by excessive frosting, but also avoids excessive temperature rise caused by defrosting. While affecting the nutritional preservation of food, store food in the refrigerator as much as possible to ensure that no nutrition is lost.

Furthermore, in the defrosting control method of the refrigerator of the present invention, because there are multiple heating wires, the defrosting program can be adjusted, the defrosting efficiency and effect can be improved, and the defrosting can be more thorough.

Further, in the defrosting control method of the refrigerator of the present invention, the switching reminder function and the complete defrosting control program after the switching can promptly remind the user to eat the food, so as to prevent the subsequent temperature fluctuations in the cryogenic room from greatly affecting the nutrition of the food. And taste. Of course, the defrosting control method of the refrigerator of the present invention can ensure the refrigeration efficiency and prevent large fluctuations in the temperature of the cryogenic compartment even after a reminder, so as to ensure the nutrition and taste of the food.

Furthermore, in the defrosting control method of the refrigerator of the present invention, the rapid switching between the deep cooling mode and the conventional cooling mode can be realized, and the heating device facilitates the defrosting of the evaporator and realizes the rapid switching of the two temperature zones.

Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will better understand the above and other objectives, advantages and features of the present invention.

Description of the drawings

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary but not restrictive manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the attached picture:

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

2 is a schematic diagram of a cascade compression refrigeration system in a refrigerator according to an embodiment of the present invention;

Fig. 3 is a partial structural diagram of a refrigerator according to an embodiment of the present invention;

Fig. 4 is a schematic sectional view of a partial structure of a refrigerator according to an embodiment of the present invention;

Fig. 5 is a partial structural diagram of a refrigerator according to an embodiment of the present invention;

Fig. 6 is a schematic flowchart of a defrosting control method for a refrigerator according to an embodiment of the present invention;

_{7 is a schematic diagram of the relationship between the time when the first defrost heating device works P h1} , the time when the low-temperature evaporator works P _DC , and the temperature in the storage space in the defrost control method of a refrigerator according to an embodiment of the present invention;

Fig. 8 is a diagram showing the time when the first defrost heating device and the second defrost heating device work simultaneously P _{h1+h2 and} the time when the low-temperature evaporator works P _DC in the defrost control method of the refrigerator according to an embodiment of the present invention. Schematic diagram of temperature in the object space;

Fig. 9 is a diagram showing the time when the first defrost heating device and the second defrost heating device work at the same time P _{h1+h2 and} the time when the low-temperature evaporator works P _DC in the defrost control method of the refrigerator according to an embodiment of the present invention. Schematic diagram of temperature in the object space;

_{Fig. 10 is the time when the first defrost heating device works P h1 and} the time when the first defrost heating device and the second defrost heating device work P _h1+h2 simultaneously in the defrost control method of the refrigerator according to an embodiment of the present invention , Schematic diagram of the relationship between the working P _DC _{time of the low-temperature evaporation section, the working P C} time of the high-temperature evaporation section, and the temperature in the storage space.

Detailed ways

Fig. 1 is a schematic diagram of a refrigerator according to an embodiment of the present invention. As shown in Fig. 1 and referring to Figs. 2 to 5, an embodiment of the present invention provides a refrigerator. The refrigerator may include a cabinet 20, an evaporator, and a refrigeration system. Wherein, a plurality of storage compartments are also formed in the box body 20, which may include a first storage compartment 21, a second storage compartment 22 and a third storage compartment 23. The space in the second storage compartment 22 may be a storage space. The refrigeration system may be arranged in the box 20. The refrigeration system includes a high-temperature refrigeration cycle 30 and a low-temperature refrigeration cycle 40. The refrigeration system may also be referred to as a cascade compression refrigeration system. The "high temperature" and "low temperature" in the "high-temperature refrigeration cycle 30" and the "low-temperature refrigeration cycle 40" are relative terms. Relatively speaking, the refrigerant flowing in the high-temperature refrigeration cycle 30 The evaporation temperature is higher than the evaporation temperature of the refrigerant flowing in the low-temperature refrigeration cycle 40. The evaporator is configured to provide cooling to the storage space, and the evaporator includes a low-temperature stage evaporating part arranged in the low-temperature stage refrigeration cycle, and a high-temperature stage evaporating part arranged in the high-temperature stage refrigeration cycle .

Specifically, the high-temperature refrigeration cycle circuit 30 is used to circulate the first refrigerant, and a control valve 33 is provided therein, and a first evaporator 35 for absorbing heat, a high-temperature evaporator 36 and an evaporator 37 are provided. The first evaporator 35 and the high-temperature-stage evaporator 36 are used to encourage the first refrigerant flowing therethrough to absorb heat, and are used to provide cooling for the first storage compartment 21 and the second storage compartment 22 respectively. The high-temperature refrigeration cycle 30 further includes a high-temperature compressor 31 and a high-temperature condensing device 32. The low-temperature refrigeration cycle 40 is used to circulate the second refrigerant, and a condensing part 42 and a low-temperature evaporating part 44 are provided therein. Among them, the low-temperature evaporator 44 is used to encourage the second refrigerant flowing therethrough to absorb heat and to provide cooling for the second storage compartment 22. The low-temperature refrigeration cycle 40 also includes a low-temperature compressor 41. That is, the high-temperature refrigeration cycle 30 may include a high-temperature compressor 31, a high-temperature condenser 32, a control valve 33, an evaporator 37, a first evaporator 35, and a high-temperature evaporator 36. The low-temperature refrigeration cycle 40 may include a low-temperature compressor 41, a condensing part 42, and a low-temperature evaporating part 44. The evaporating part 37 is used for urging the first refrigerant flowing therethrough to absorb the heat of the second refrigerant flowing through the condensing part 42 in the low-temperature refrigeration cycle 40. The first refrigerant and the second refrigerant may be the same refrigerant, such as R600a, or different refrigerants.

In the refrigerator according to the embodiment of the present invention, a first evaporator 35 and a high-temperature evaporator 36 are provided in the high-temperature refrigeration cycle 30. The first evaporator 35 and the high-temperature evaporator 36 are respectively used to provide cooling for the first storage compartment 21 and the second storage compartment 22, and a low-temperature evaporator 44 is provided in the low-temperature refrigeration cycle 40 for Provide cooling for the second storage compartment 22. The energy utilization efficiency in the high-temperature refrigeration cycle 30 is improved, and cooling can be supplied to multiple storage compartments of the refrigerator at the same time, which improves the refrigeration efficiency of the refrigerator. Both the high-temperature evaporator 36 and the low-temperature evaporator 44 can supply cold to the second storage compartment 22, so that a single storage compartment of the refrigerator has the function of multiple temperature zones, even if the second storage compartment 22 can obtain different The refrigeration effect can meet different refrigeration requirements, and can expand the temperature range of the second storage compartment 22, which means that the refrigerator can not only have a deep cooling function, but also meet the energy-saving requirements of daily refrigeration.

Further, the inlet of the control valve 33 may be in communication with the outlet of the high-temperature condensing device 32. The control valve 33 has a first outlet and a second outlet. The inlet of the first evaporator 35 is in communication with the first outlet; the inlet of the high-temperature stage evaporator 36 is in communication with the second outlet. The outlet of the high-temperature evaporator 36 communicates with the inlet of the first evaporator 35, and the inlet of the evaporator 37 communicates with the outlet of the first evaporator 35. In other embodiments, the outlet of the high-temperature evaporator 36 is connected to the inlet of the evaporator 37, and the outlet of the evaporator 37 is connected to the inlet of the first evaporator 35. The control valve 33 can be a switching valve. The arrangement position of each evaporator and the evaporator 37 in the high-temperature refrigeration cycle 30 can ensure the refrigeration efficiency of each evaporator during normal temperature refrigeration, improve the energy efficiency of the refrigerator, and have a significant energy saving effect. The control valve 33 has a third outlet, and the third outlet communicates with the inlet of the evaporation part 37. The evaporator 37 can be made to work alone or the evaporator 37 and the first evaporator 35 can work while the high-temperature evaporator 36 does not work, thereby improving the cryogenic efficiency. Further, the high-temperature refrigeration cycle circuit 30 further includes a second evaporator 38, which is arranged between the third outlet and the evaporator 37, and the second evaporator 38 is used to supply the third storage compartment 23 cold. When the evaporator 37 is working, the third storage compartment 23 can also be cooled at the same time, which improves the working efficiency of the high-temperature refrigeration cycle circuit 30, and the energy saving effect is obvious. A first throttling device 341 is arranged between the inlet and the first outlet of the first evaporator 35; a second throttling device 342 is arranged between the inlet and the second outlet of the high-temperature evaporator 36; A third throttling device 343 is provided between the inlet and the third outlet.

In some embodiments of the present invention, the first storage compartment 21 and the second storage compartment 22 are arranged side by side along the lateral extension direction of the refrigerator, and the third storage compartment 23 is arranged in the first storage compartment 21 and The upper side of the second storage compartment 22. The first storage compartment 21 may be a freezer compartment, the second storage compartment 22 may be a multi-functional room with multiple temperature zones, and the third storage compartment 23 may be a refrigerating compartment. This arrangement makes the layout of the compartments more reasonable and makes it easier to access the corresponding items.

In some embodiments of the present invention, as shown in FIG. 2, FIG. 3, and FIG. 4, the refrigerator further includes an air supply device 50 for promoting air flow through the evaporator and driving the air flow into the second storage compartment 22. Further, the high-temperature stage evaporator 36 includes a first cooling evaporator tube, and the low-temperature evaporator 44 includes a second cooling evaporator tube. The first cooling evaporator tube and the second cooling evaporator tube pass through the same fin group. . The high-temperature stage evaporation part 36 may be disposed on the upper side of the low-temperature stage evaporation part 44. Further, the box body 20 is also formed with a first refrigeration chamber 24 for arranging the high-temperature evaporating portion 36 and the low-temperature evaporating portion 44 at a position corresponding to the rear side of the second storage compartment 22, and the first refrigerating chamber 24 passes The first air supply structure communicates with the second storage compartment 22 to provide a cooling airflow to the second storage compartment 22 through the first air supply structure.

As shown in Figures 2 to 4, the evaporator with the high-temperature evaporator 36 and the low-temperature evaporator 44 can be a two-in-two-out dual-channel evaporator, and the structure is an upper and lower structure. When the refrigerator is set to operate normally, the high temperature Stage refrigeration cycle 30 runs, and the upper high-temperature stage evaporator 36 cools. At this time, the evaporator shares the lower evaporator fins, which has a large heat exchange area and high heat exchange efficiency; when the refrigerator is set to cryogenic operation, the lower low-temperature stage evaporates The part 44 is connected, the cryogenic system works, the lower evaporator cools down, and the upper evaporator fin is shared at the same time, the heat exchange area is large, and the heat exchange efficiency is high. Arranging the evaporator structure up and down can also make the heat exchange even. It can ensure the utilization rate of the heat exchange area of the evaporator, reduce the size of the dual-channel evaporator, and at the same time heat exchange uniformly, ensure uniform distribution of pipelines, and cooperate with the air duct system and the refrigeration fan to achieve both normal temperature refrigeration and cryogenic refrigeration. It can guarantee the purpose of energy saving during conventional refrigeration.

In some embodiments of the present invention, as shown in FIGS. 1 and 5, the box body 20 is further formed with a second refrigeration device for arranging the first evaporator 35 at a position corresponding to the rear side of the first storage compartment 21. The second refrigeration chamber communicates with the first storage compartment 21 through the second air supply structure 52, so as to provide a cooling airflow to the first storage compartment 21 through the second air supply structure 52. The box body 20 is further formed with a third refrigeration chamber for arranging the second evaporator 38 at a position corresponding to the rear side of the third storage compartment 23, and the third refrigeration chamber is connected to the third storage compartment through the third air supply structure. The chamber 23 communicates to provide a cooling airflow to the third storage compartment 23 through the third air blowing structure. The first air supply structure is arranged between the first refrigeration chamber 24 and the second storage compartment 22; the rear side of the first air supply structure is provided with an air inlet, and the air supply device 50 is arranged at the air inlet. A plurality of air blowing ports 54 are provided on the front side of the first air blowing structure, and air blowing ducts 55 are provided in the first air blowing structure 51. A return air duct 56 can be provided on the lower side of the first air supply structure, so that the evaporator delivers air from the bottom to the upper part. Both the second air supply structure and the third air supply structure are similar to the first air supply structure 51.

As shown in FIG. 2, the outlet pipe of the high-temperature stage evaporator 36 is provided with a valve that only allows the refrigerant from the high-temperature stage evaporator 36 to flow out in one direction. The valve may be a one-way valve 39, and the one-way valve 39 can prevent the first refrigerant downstream of the one-way valve 39 from passing in reverse. When the low-temperature stage compressor 41 is operating, the temperature of the low-temperature stage evaporation portion 44 is very low. Because the distance between the high-temperature evaporator 36 and the low-temperature evaporator 44 is relatively short, the temperature of the piping of the high-temperature evaporator 36 is also relatively low, even significantly lower than the high-temperature evaporator in the high-temperature refrigeration cycle 30. The temperature of other evaporators downstream of section 36. This valve can prevent the first refrigerant in other cooling evaporators downstream of the high-temperature stage evaporator 36 from flowing into the high-temperature stage evaporator 36 from the discharge port of the high-temperature stage evaporator 36, thereby avoiding the high-temperature refrigeration cycle 30 The reverse flow of the first refrigerant ensures the effective circulation of the first refrigerant and improves the overall refrigeration efficiency.

Take R600a as an example, when the refrigerant temperature is -50℃, the pressure is about 0.017Mpa, while the suction pressure of the compressor of R600a is about 0.06Mpa, the pressure on the side of the high-temperature evaporator 36 is lower than the suction pressure of the high-temperature compressor 31 As a result, the high-temperature refrigeration cycle is gradually concentrated in the high-temperature evaporator 36, the refrigerant of the high-temperature refrigeration cycle is gradually reduced, and the refrigeration is poor. The check valve 39 can prevent the refrigerant from backflowing and accumulating in the high-temperature evaporator 36 from causing poor cooling. The check valve 39 can solve the problem of refrigerant accumulation caused by low temperature without controlling the program to adjust the operation of the valve body. The structure is simple and the operability is strong.

The high-temperature condensing device 32 may include a condenser and an anti-dew pipe. The low-temperature refrigeration cycle 40 further includes a low-temperature condensing device 45 and a low-temperature throttling device 43. The inlet of the high-temperature condenser device 32 is connected to the outlet of the high-temperature compressor 31, the outlet of the evaporator 37 is connected to the inlet of the first evaporator 35, and the outlet of the first evaporator 35 is connected to the inlet of the high-temperature compressor 31. The outlet of the low-temperature compressor 41 is connected to the inlet of the low-temperature condensing device 45, the outlet of the low-temperature condensing device 45 is connected to the inlet of the condensing section 42, and the outlet of the condensing section 42 is connected to the low-temperature throttling device 43 and the low-temperature throttling device 43. The outlet is connected to the inlet of the low-temperature stage evaporating part 44, and the outlet of the low-temperature stage evaporating part 44 is connected to the inlet of the low-temperature stage compressor 41.

In some alternative embodiments, the condensing part 42 and the evaporating part 37 may form a condensing evaporator. The condensing evaporator can be a double-pipe heat exchanger. In other optional embodiments, the condensing part 42 and the evaporating part 37 may also be two copper pipes that abut against each other. The two copper pipes are arranged close to each other. The contact part between the two copper pipes can be fixed by soldering to enhance heat transfer. The outside of the two copper tubes can be wrapped with aluminum foil. In other alternative embodiments, the condensing part 42 and the evaporating part 37 may share heat exchange fins. The evaporating unit 37 and the condensing unit 42 are provided in the second refrigerating chamber. Of course, the evaporating part 37 and the condensing part 42 may also be arranged at other positions of the refrigerator.

In some embodiments of the present invention, a storage compartment is also formed in the box body 20, and the inner space may be a storage space. In some embodiments of the present invention, the refrigeration system may be a cascade compression refrigeration system with other structures including a high-temperature refrigeration cycle 30 and a low-temperature refrigeration cycle 40. For example, the evaporator includes only the low-temperature stage evaporator 44 provided in the low-temperature stage refrigeration cycle 40.

As shown in FIG. 6, an embodiment of the present invention also provides a defrosting control method for a refrigerator. The refrigerator further includes a first defrosting heating device, and the first defrosting heating device may be an electric heating wire. The defrosting control method of a refrigerator at least includes the following steps S602 to S604:

In step S602, when the low-temperature evaporator 44 is working, the temperature in the storage space is detected, and it is judged whether the temperature of the storage space reaches the preset temperature range during the decrease process and stays within the preset temperature range for a preset period of time. It is assumed that there is a first preset temperature value within the temperature range. Keeping within the preset temperature range means that it fluctuates around the first preset temperature value, and the fluctuation range generally does not exceed 2°C. When the first preset temperature value is -60°C, the preset temperature range can be -62°C To -58°C. The first preset temperature value can be, for example, -80°C to -50°C, such as -60°C, and different deep cooling temperatures can be set according to different foods.

Step S604, when the temperature of the storage space reaches the preset temperature range and remains within the preset temperature range for a preset period of time while the temperature of the storage space is falling, the defrosting procedure is started to perform a defrosting; and the defrosting procedure includes the first Defrosting procedure. The first defrosting procedure includes: closing the low-temperature evaporator 44 and turning on the first defrosting heating device to heat the evaporator. The temperature in the storage space is detected, and it is determined whether the difference between the temperature of the storage space and the first preset temperature value is greater than the first preset difference. When the difference between the temperature of the storage space and the first preset temperature value is greater than the first preset difference value, the first defrosting process is turned off, and the low-temperature evaporator 44 is turned on. The first preset difference value may be 3°C to 8°C, such as 5°C, 3°C, and so on. Set the defrosting temperature change limit, which can defrost multiple times in time, not only to ensure that the refrigeration is not affected by excessive frosting, but also to avoid the excessive temperature rise caused by defrosting that affects the nutritional preservation of food, and use it as much as possible The food is stored in the refrigerator to ensure that no nutrients are lost. Specifically, as shown in Figure 7, according to research on food preservation, when the temperature exceeds -50°C, it will affect the taste of the cryogenic preservation food. Based on this, it is assumed that the temperature that the cryogenic compartment can reach during normal operation is -60 ℃, when the defrosting starts, the first defrosting heating device works. When the compartment temperature T _df rises greater than 5℃, the first defrosting heating device stops working, and the refrigerator continues to cool normally, such as the normal deep cooling mode.

In some embodiments of the present invention, the refrigerator further includes a second defrosting heating device, and the second defrosting heating device may be an electric heating wire. The defrosting procedure further includes a second defrosting procedure, and the defrosting control method of the refrigerator further includes:

The working time of the low-temperature evaporator 44 between the end of each defrosting and the beginning of the next defrosting is recorded. That is to say, the time used for refrigeration of the storage space in the low-temperature refrigeration cycle between two defrosts is recorded. Determine whether the ratio between the next working time and the previous working time is greater than or equal to the preset ratio, and the preset ratio is greater than 1. Preferably, the preset ratio is 2, 2.5, 3, etc.

When the ratio between the next working time and the last working time is greater than or equal to the preset ratio, when the defrosting program is started, the second defrosting program is started, otherwise the first defrosting program is started.

The second defrosting procedure includes: turning off the low-temperature evaporator 44 and turning on at least the second defrosting heating device to heat the evaporator. The temperature in the storage space is detected, and it is determined whether the difference between the temperature of the storage space and the first preset temperature value is greater than the second preset difference value. When the difference between the temperature of the storage space and the first preset temperature value is greater than the second preset difference value, the second defrosting process is closed, and the low-temperature evaporator 44 is turned on. The second preset difference is greater than the first preset difference. The second preset difference may be 8°C to 15°C, such as 10°C, 12°C, and so on.

For example, in some embodiments, the heating power of the second defrosting heating device is greater than the heating power of the first defrosting heating device, and in the second defrosting procedure, only the second defrosting heating device is turned on, or the second defrosting heating device is turned on at the same time. A defrosting heating device and a second defrosting heating device to heat the evaporator. In other embodiments, the heating power of the second defrosting heating device is less than or equal to the heating power of the first defrosting heating device, and in the second defrosting procedure, the first defrosting heating device and the second defrosting heating device are turned on at the same time. Frost heating device to heat the evaporator.

Further, after the cryogenic mode is turned on to make the low-temperature evaporator 44 work, and after the first defrosting process is performed at least twice in succession, it can be judged whether the ratio between the next working time and the previous working time is Greater than or equal to the preset ratio. As shown in Figure 8, in the storage space, that is, the cryogenic compartment, the normal working cycle (removing the special conditions of not closing the door tightly or putting too much food) starts from the third cycle of normal working of cryogenic, If the power-on time in the subsequent cycle is more than twice that of the previous cycle, the default is that the refrigeration time is prolonged due to incomplete defrosting. At this time, the high-efficiency defrosting mode is turned on. For example, the first defrosting heating device and the second defrosting heating device work at the same time. When the temperature T _{df of the} compartment rises by more than 10° C., the defrosting stops and the refrigerator continues to cool normally.

In some embodiments of the present invention, the defrosting control method of the refrigerator further includes: when the second defrosting program needs to be started, judging whether the time interval between the time and the time when the second defrosting program was started last time is less than Or equal to the preset time interval. If yes, enter the reminding procedure, if not, proceed to the second defrosting procedure. The preset time interval may be 18h to 30h, such as 24h. Further optionally, when the reminding program is issued, the second defrosting program is executed at the same time.

The reminder procedure may include: sending out reminder messages. To determine whether the feedback instruction is received, it can be determined whether the feedback instruction is received after the second defrosting program is executed, or whether the second defrosting program is not executed, and whether the feedback instruction is received within the preset time of sending the reminder message. If a feedback instruction is received, the corresponding operation will be executed according to the feedback instruction. The reminder message can prompt the switch function of the cryogenic compartment for the refrigerator display to remind the user that the food in the cryogenic chamber is expired, so that the user is expected to switch back to the normal refrigeration cycle with one key, and start the normal refrigeration and normal defrosting cycle. Of course, the reminder information can also be other information. Further optionally, if the feedback instruction is not received, the second defrosting procedure is performed when the subsequent defrosting procedure is performed.

In some further embodiments of the present invention, the refrigerator further includes a high-temperature refrigeration cycle 30, and the evaporator includes a high-temperature evaporator 36 disposed in the high-temperature refrigeration cycle 30. The feedback instruction includes switching the cryogenic mode for operating the low-temperature stage evaporating unit 44 to a normal cooling mode for operating the high-temperature stage evaporating unit 36. Further, in some embodiments, executing the corresponding operation according to the feedback instruction includes: turning on the first defrosting heating device and/or the second defrosting heating device. Further, executing the corresponding operation according to the feedback instruction also includes: when the temperature of the storage space rises to a second preset temperature value, and/or when the temperature of the evaporator rises to a third preset temperature value, turning off the first The frost heating device and/or the second defrosting heating device control the high-temperature evaporator 36 according to the temperature in the storage space to perform the normal cooling mode. That is, when the temperature of the storage space rises to the second preset temperature value, and/or when the temperature of the evaporator rises to the third preset temperature value, if the first defrosting heating device and the second defrosting heating device If either or both of the heating devices are in the on state, the heating device in the on state is turned off. For example, if only the first defrost heating device is turned on after receiving the feedback command, then when the temperature of the storage space rises to the second preset temperature value, and/or the temperature of the evaporator rises to the third preset temperature subsequently At the temperature value, turn off the first defrosting heating device. Correspondingly, if only the second defrost heating device is turned on, then when the temperature of the storage space rises to the second preset temperature value, and/or when the temperature of the evaporator rises to the third preset temperature value subsequently , Turn off the second defrosting heating device; if the first defrosting heating device and the second defrosting heating device are turned on at the same time, subsequently when the temperature of the storage space rises to the second preset temperature value, and/or, evaporate When the temperature of the heater reaches the third preset temperature value, the first defrosting heating device and the second defrosting heating device are turned off. Turning on the first defrosting heating device and/or the second defrosting heating device can realize the rapid rise of the temperature of the cryogenic compartment back to the normal compartment without increasing additional power consumption.

In other embodiments of the present invention, performing corresponding operations according to the feedback instruction includes: turning on the first defrosting heating device and the second defrosting heating device, and turning off when the temperature of the storage space rises to a fourth preset temperature value. The second defrosting and heating device turns off the first defrosting and heating device when the temperature of the storage space rises to the fifth preset temperature value, and controls the high-temperature evaporator 36 according to the temperature in the storage space to perform the normal cooling mode . The fifth preset temperature value is higher than the fourth preset temperature value. In the process of the conventional refrigeration mode, the corresponding conventional defrosting procedure can be performed.

In some alternative embodiments of the present invention, when it is determined that the time interval between this time and the time when the second defrosting program was last started is less than or equal to the preset time interval, the second defrosting program may be executed after the completion of the second defrosting program. After that, or directly and automatically switch the cryogenic mode for operating the low-temperature evaporator 44 to the normal cooling mode for operating the high-temperature evaporator 36.

In the embodiment of the present invention, as shown in FIG. 9 and FIG. 10, when the dual heating wires are activated more than once within 24 hours, it indicates that even if the dual heating wires are working, the defrosting cannot be completed. At this time, the refrigerator display prompts the switching function of the cryogenic compartment (reminding the user that the food in the cryogenic chamber is expired), and it is hoped that the user can choose to switch back to the normal refrigeration cycle with one key, and start the conventional refrigeration + normal defrosting cycle. As shown in Fig. 10, if the user normally chooses to switch back, the first defrosting heating device is activated to accelerate the temperature rise in the storage space, and at the same time play the role of defrosting. There is no problem with defrosting when the temperature of the normal compartment is refrigerated. If the user does not choose to switch back to the normal refrigeration mode despite the reminder, in order to ensure that the normal refrigeration is not affected, as shown in Figure 9, the control strategy of increasing the number of defrosts or the defrosting of the high-efficiency defrosting mode can be adopted to ensure the defrosting. Frost thoroughly.

So far, those skilled in the art should realize that although multiple exemplary embodiments of the present invention have been illustrated and described in detail herein, they can still be disclosed according to the present invention without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications that conform to the principles of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all these other variations or modifications.

Claims

A defrosting control method for a refrigerator, the refrigerator comprising a box body, an evaporator, a low-temperature refrigeration cycle circuit and a first defrosting heating device, a storage space is formed inside the box body, and the evaporator is configured as a The storage space provides cooling, and the evaporator includes a low-temperature evaporator arranged in the low-temperature refrigeration cycle; wherein, the defrosting control method of the refrigerator includes:

When the low-temperature evaporation unit is working, the temperature in the storage space is detected, and it is determined whether the temperature of the storage space reaches a preset temperature range during the drop process and is kept within the preset temperature range. Set the time length, and there is a first preset temperature value in the preset temperature range;

When the temperature of the storage space reaches the preset temperature range and remains within the preset temperature range for a preset period of time during the process of falling, the defrosting program is started to perform a defrosting; and The frosting procedure includes the first defrosting procedure;

The first defrosting procedure includes: turning off the low-temperature evaporator, and turning on the first defrosting heating device to heat the evaporator; detecting the temperature in the storage space, and judging the storage Whether the difference between the temperature of the space and the first preset temperature value is greater than the first preset difference; the difference between the temperature of the storage space and the first preset temperature value is greater than the first preset temperature When the difference is set, the first defrosting program is closed, and the low-temperature evaporator is turned on.
The defrosting control method of a refrigerator according to claim 1, wherein the refrigerator further includes a second defrosting heating device; the defrosting program further includes a second defrosting program, and the defrosting control method of the refrigerator Also includes:

Record the working time of the low-temperature evaporator between the end of each defrosting and the beginning of the next defrosting;

Judging whether the ratio between the working time of the next time and the working time of the previous time is greater than or equal to a preset ratio, and the preset ratio is greater than 1;

When the ratio between the working time of the next time and the working time of the last time is greater than or equal to the preset ratio, when the defrosting program is started, the second defrosting program is started, otherwise, the second defrosting program is started. State the first defrosting procedure; and

The second defrosting procedure includes: turning off the low-temperature evaporator, and turning on at least the second defrosting heating device to heat the evaporator; detecting the temperature in the storage space, and judging the storage space Whether the difference between the temperature of the object space and the first preset temperature value is greater than the second preset difference; the difference between the temperature of the storage space and the first preset temperature value is greater than the second When the difference is preset, the second defrosting program is turned off, and the low-temperature evaporator is turned on; the second preset difference is greater than the first preset difference.
The defrosting control method of a refrigerator according to claim 2, wherein:

The heating power of the second defrosting heating device is greater than the heating power of the first defrosting heating device, and in the second defrosting procedure, only the second defrosting heating device is turned on, or all the heating devices are turned on at the same time. The first defrosting heating device and the second defrosting heating device to heat the evaporator; or,

The heating power of the second defrosting heating device is less than or equal to the heating power of the first defrosting heating device, and in the second defrosting program, the first defrosting heating device and the The second defrost heating device to heat the evaporator.
The defrosting control method of a refrigerator according to claim 2, wherein:

After the cryogenic mode is turned on to make the low-temperature evaporator work, and after the first defrosting process is performed at least twice in succession, it is judged whether the working time of the next time is between the working time of the previous time Whether the ratio of is greater than or equal to the preset ratio.
The defrosting control method of a refrigerator according to claim 2, further comprising:

When the second defrosting program needs to be started, determining whether the time interval between the time and the time when the second defrosting program was started last time is less than or equal to a preset time interval;

If yes, then enter the reminding procedure, if not, then proceed to the second defrosting procedure.
The method for controlling defrosting of a refrigerator according to claim 5, wherein:

When entering the reminding program, the second defrosting program is executed at the same time.
The defrosting control method of a refrigerator according to claim 5 or 6, wherein the reminding program includes:

Send out a reminder message;

Determine whether a feedback instruction is received;

If the feedback instruction is received, corresponding operations are performed according to the feedback instruction.
The defrosting control method of a refrigerator according to claim 7, wherein:

If the feedback instruction is not received, the second defrosting procedure is performed when the defrosting procedure is subsequently performed.
The defrosting control method of a refrigerator according to claim 7, wherein:

The refrigerator further includes a high-temperature refrigeration cycle, and the evaporator includes a high-temperature evaporator disposed in the high-temperature refrigeration cycle;

The feedback instruction includes switching the cryogenic mode for operating the low-temperature stage evaporator to a normal cooling mode for operating the high-temperature evaporator.
The method for controlling defrosting of a refrigerator according to claim 9, wherein:

Performing corresponding operations according to the feedback instruction includes: turning on the first defrosting heating device and/or the second defrosting heating device.
The method for controlling defrosting of a refrigerator according to claim 10, wherein:

Performing the corresponding operation according to the feedback instruction further includes: turning off when the temperature of the storage space rises to a second preset temperature value, and/or when the temperature of the evaporator rises to a third preset temperature value The first defrosting heating device and/or the second defrosting heating device controls the high-temperature evaporator according to the temperature in the storage space to perform the conventional cooling mode.
The method for controlling defrosting of a refrigerator according to claim 9, wherein:

Performing corresponding operations according to the feedback instruction includes: turning on the first defrosting heating device and the second defrosting heating device, and turning off the storage space when the temperature of the storage space reaches a fourth preset temperature value. The second defrosting heating device turns off the first defrosting heating device when the temperature of the storage space rises to a fifth preset temperature value, and controls the high-temperature level evaporation according to the temperature in the storage space Part to perform the conventional cooling mode; the fifth preset temperature value is higher than the fourth preset temperature value.
The method for controlling defrosting of a refrigerator according to claim 9, wherein:

In the process of performing the conventional refrigeration mode, a corresponding conventional defrosting procedure may be performed.