Refrigerator and defrosting control method thereof

Abstract

The application provides a refrigerator and a defrosting control method thereof. The refrigerator comprises an evaporator, a defrosting device, a first evaporation dish and a second evaporation dish. The defrosting control method comprises: starting the defrosting device at a preset time period to defrost the evaporator and make defrosting water dropped from the evaporator to the first evaporation dish; continuously detecting a liquid level value of the first evaporation dish; judging whether a high liquid level event that the liquid level value of the first evaporation dish is higher than a first liquid level threshold value occurs; in the case that the high liquid level event occurs, turning on a flow path of the first evaporation dish to the second evaporation dish and recording a current turning-on time; and determining the preset time period according to a turning-on interval time length between the current turning-on time and a previous turning-on time. The defrosting control method can timely adjust the defrosting period according to the defrosting condition of the evaporator, meet the defrosting demand of the evaporator, save energy, has high practicability and is easy to popularize.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of defrosting of a refrigerator, and in particular to a refrigerator and a defrosting control method thereof. BACKGROUND

[0002] The evaporator of a refrigerator is kept at a low temperature for a long time. When water vapor in the surrounding air adheres to the surface of the evaporator, frost is formed, which affects the heat exchange efficiency of the evaporator.

[0003] The prior art has a technical solution of installing a defrosting device (such as electric heating) on the evaporator. The defrosting device can be started periodically to realize periodic defrosting of the evaporator. However, since the amount of frost on the evaporator is affected by the load of the refrigerator, simple periodic defrosting may not correspond to the amount of frost at the defrosting time, which not only leads to low defrosting efficiency, but also easily causes waste of electricity due to frequent operation of the defrosting device. SUMMARY

[0004] An object of the present application is to overcome at least one of the defects in the prior art and provide a refrigerator and a defrosting control method thereof.

[0005] A further object of the present application is to meet the defrosting needs of the evaporator while saving energy.

[0006] In particular, the present application provides a defrosting control method of a refrigerator, the refrigerator comprising an evaporator, a defrosting device for defrosting the evaporator, a first evaporating pan for collecting defrosting water, and a second evaporating pan in controlled communication with the first evaporating pan; the defrosting control method comprising: starting the defrosting device at a preset time period to defrost the evaporator and causing the defrosting water dripping from the evaporator to be discharged to the first evaporating pan; continuously detecting the liquid level value of the first evaporating pan; determining whether a high liquid level event occurs in which the liquid level value of the first evaporating pan is higher than a first liquid level threshold; in the case where the high liquid level event occurs, opening the flow path of the first evaporating pan to the second evaporating pan, and recording the current opening time; determining the preset time period according to the opening interval time length between the current opening time and the previous opening time.

[0007] Optionally, the step of determining the preset time period according to the opening interval time length further comprises: determining whether the opening interval time length is less than a preset interval time length; if yes, taking a first preset time length as the preset time period; if no, taking a second preset time length as the preset time period; and the first preset time length is less than the second preset time length.

[0008] Optionally, the step of determining whether the liquid level value of the first evaporating pan exceeds the first liquid level threshold further comprises: in the case where the high liquid level event does not occur, taking the second preset time length as the preset time period.

[0009] Optionally, the first preset duration is configured to be between 2 hours and 8 hours; and / or the second preset duration is configured to be between 9 hours and 15 hours.

[0010] Optionally, after opening the flow path from the first evaporating dish to the second evaporating dish, the step further includes: determining whether the liquid level value of the first evaporating dish is lower than a second liquid level threshold; if so, cutting off the flow path from the first evaporating dish to the second evaporating dish; wherein the second liquid level threshold is lower than the first liquid level threshold.

[0011] Optionally, the refrigerator further includes a cabinet and a compressor, the cabinet defines a compressor cabin, and the compressor is arranged in the compressor cabin; and the first evaporating dish is fixed to the upper part of the compressor to evaporate the defrost water using the heat released by the compressor.

[0012] Optionally, the second evaporating dish is disposed in the pressurizing chamber, and a heating device is provided in the second evaporating dish; and the step of connecting the flow path from the first evaporating dish to the second evaporating dish further comprises: starting the heating device.

[0013] Optionally, the refrigerator further comprises a liquid level switch for controlling the flow path from the first evaporating dish to the second evaporating dish; and the step of opening the flow path from the first evaporating dish to the second evaporating dish further comprises: turning on the liquid level switch.

[0014] Optionally, a ratio of the first liquid level threshold to the height of the first evaporating dish is between 2 / 3 and 1.

[0015] In particular, the present invention also provides a refrigerator comprising a memory, a processor, and a machine executable program stored in the memory and running on the processor, and the processor implements the defrost control method according to any one of the above items when executing the machine executable program.

[0016] The refrigerator defrost control method of the present invention utilizes a dual-dish drainage structure. During the defrost process, if the liquid level in the first evaporating dish is too high, the first and second evaporating dishes are connected to prevent overflow. Furthermore, the drainage relationship between the first and second evaporating dishes is used to adjust the preset time period for the next defrost cycle. This allows the defrost system to operate more frequently when the evaporator is heavily frosted, and less frequently when the evaporator is lightly frosted. This allows for timely defrosting of the evaporator, thereby saving energy.

[0017] 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 become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0019] Figure 1 is a schematic diagram of a refrigerator according to one embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the positional relationship between a compressor, a first evaporating dish, and a second evaporating dish in a refrigerator according to one embodiment of the present invention;

[0021] Figure 3 is a schematic block diagram of a refrigerator according to one embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a refrigerator control method according to an embodiment of the present invention;

[0023] Figure 5 is a control flow chart of a refrigerator according to one embodiment of the present invention. DETAILED DESCRIPTION

[0024] In the description of this embodiment, it should be understood that the terms "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "depth," and the like, indicating orientations or positions, are based on the orientations in normal use and can be determined with reference to the orientations or positions shown in the accompanying drawings. For example, "front" in an orientation refers to the side facing the user. This is merely for the convenience of describing the present invention and to simplify the description. It does not indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, it should not be construed as limiting the present invention.

[0025] See also Figure 1 , Figure 1 FIG2 is a schematic diagram of a refrigerator 1 according to an embodiment of the present invention. The present invention provides a refrigerator 1 , which generally includes a body 10 and a door 20 .

[0026] The housing 10 includes an outer shell and multiple inner containers 12. The outer shell is located at the outermost side of the refrigerator 1 to protect the entire refrigerator 1. The multiple inner containers 12 are enclosed by the outer shell, and the space between them is filled with insulation material (forming a foam layer 120) to reduce heat dissipation from the inner containers 12. Each inner container 12 defines a forwardly open storage compartment 14. These compartments can be configured as refrigerators, freezers, temperature-controlled chambers, and so on. The specific number and function of the storage compartments 14 can be configured according to pre-determined requirements.

[0027] The door 20 is movably arranged in front of the inner container 12 to open and close the storage compartment 14 of the inner container 12. For example, the door 20 can be arranged on one side of the front part of the box body 10 in a hinged manner and open and close the storage compartment 14 in a pivoting manner.

[0028] Furthermore, the refrigerator 1 can also be provided with cold capacity by a circulating refrigeration system to achieve a storage environment of refrigeration, freezing, variable temperature, etc. The circulating refrigeration system can be composed of a compressor 310, a condenser, a throttling device and an evaporator 320180.

[0029] The compressor 310 serves as the power source of the circulating refrigeration system. It increases the pressure and temperature of the refrigerant vapor through compression, creating conditions for transferring the heat of the refrigerant vapor to the external environment medium. That is, it compresses the low-temperature, low-pressure refrigerant vapor to a high-temperature, high-pressure state so that the refrigerant vapor can be condensed using air or water at room temperature as a cooling medium. The condenser uses the environment to remove the heat of the high-temperature, high-pressure refrigeration vapor from the compressor 310, cooling the high-temperature, high-pressure refrigerant vapor and condensing it into a high-pressure, room-temperature refrigerant liquid. Specifically, a compressor compartment 18 can also be defined at the lower rear side of the cabinet 10 of the refrigerator 1, and the compressor 310 and the condenser can both be arranged in the compressor compartment 18.

[0030] The throttling device is also a heat exchange device in which the low-temperature and low-pressure refrigerant liquid after throttling evaporates and turns into steam.

[0031] The evaporator 320180 can be arranged in the housing 10 to provide cooling to the storage compartment 14 of the refrigerator 1 by evaporating heat. For example, in a compression-type direct cooling refrigerator 1, the evaporator 320 can be arranged on the outside or inside of the rear wall of the inner tank 12 of the refrigerator 1. In a compression-type air-cooled refrigerator 1, the housing 10 further comprises a cooling chamber 16. The evaporator 320 is connected to the storage compartment 14 through an air duct system, and the evaporator 320 is arranged in the cooling chamber 16. The cooling chamber 16 is provided with an air blower 322 ( Figure 1 As shown), to circulate refrigeration to the storage compartment 14.

[0032] In some embodiments, the evaporator 320 is further provided with a defrost device 330, which can be an electric heating wire fixed to the evaporator 320. When frost appears on the evaporator 320, the defrost device 330 is activated to melt the frost to ensure the heat exchange efficiency of the evaporator 320.

[0033] See also Figure 2 , Figure 2Schematic diagram illustrating the positional relationship between the compressor 310, the first evaporation dish 340, and the second evaporation dish 342 in a refrigerator 1 according to one embodiment of the present invention. Furthermore, the refrigerator 1 may further include a first evaporation dish 340. The first evaporation dish 340 may be connected to the water receiving tray at the bottom of the evaporator 320 so that defrost water from the evaporator 320 can be drained into the first evaporation dish 340 for evaporation. The first evaporation dish 340 may be positioned within the compressor compartment 18 to leverage the relatively high temperature of the compressor compartment 18 to improve evaporation efficiency. In some specific embodiments, the first evaporation dish 340 may also be mounted directly on top of the compressor 310 to utilize the heat released by the compressor 310 to evaporate the defrost water, further improving evaporation efficiency.

[0034] See also Figure 2 Furthermore, the refrigerator 1 may also include a second evaporation dish 342. The second evaporation dish 342 may also be disposed within the compressor compartment 18 and controllably connected to the first evaporation dish 340. In this manner, the second evaporation dish 342 can serve as an auxiliary evaporation dish. When the liquid level in the first evaporation dish 340 is too high, the flow path from the first evaporation dish 340 to the second evaporation dish 342 can be opened, thereby preventing the risk of overflow from the first evaporation dish 340 due to untimely evaporation or excessive defrost water.

[0035] A heating device 348 may be further provided in the second evaporating dish 342 . The heating device 348 may be a heating wire coiled on the bottom wall of the second evaporating dish 342 , so as to improve the evaporation efficiency of the second evaporating dish 342 .

[0036] See also Figure 2 The first evaporating dish 340 and the second evaporating dish 342 may be connected by a pipe 344. Specifically, a water outlet (not shown) is provided on the top of the first evaporating dish 340, which is connected to the pipe 344. The pipe 344 may be provided with a liquid level switch 346 (e.g., a valve) to control the flow from the first evaporating dish 340 to the second evaporating dish 342.

[0037] In summary, the defrost process of the refrigerator 1 according to the present invention can be summarized as follows: first, the defrost device 330 is activated to defrost the evaporator 320. The defrosted water generated by the evaporator 320 is discharged into the first evaporation dish 340, where it evaporates. When the defrosted water flow rate is high and the first evaporation dish 340 cannot collect the defrosted water, the liquid level switch 346 can be activated to open the flow path from the first evaporation dish 340 to the second evaporation dish 342, diverting the defrosted water in the first evaporation dish 340 into the second evaporation dish 342. Simultaneously, the heating device 348 can be activated to assist evaporation, thereby ensuring the safety of the first evaporation dish 340 and improving evaporation efficiency.

[0038] It should be noted that during use, the liquid level switch 346 can be in a normally closed state, that is, the flow path from the first evaporating dish 340 to the second evaporating dish 342 is normally open. In this way, during defrosting, the first evaporating dish 340 can be used to collect and evaporate the defrost water. This not only avoids the use of the heating device 348 of the second evaporating dish 342, reducing power consumption, but also fully utilizes the heat discharged by the compressor 310 to cool the compressor 310, thereby extending the service life of the compressor 310.

[0039] See also Figure 3 , Figure 3 is a schematic block diagram of a refrigerator 1 according to one embodiment of the present invention. The refrigerator 1 of the present invention may further include a memory 42, a processor 44, and a machine-executable program 420 stored in the memory 42 and executed by the processor 44. When the processor 44 executes the machine-executable program 420, a defrost control method is implemented. This defrost control method adjusts the defrost cycle of the defrost device 330 based on the recent amount of frost on the evaporator 320, avoiding a mismatch between the defrost timing and the amount of frost, and reducing issues such as wasted cooling capacity due to overworking the defrost device 330.

[0040] See also Figure 4 , Figure 4 1 is a schematic diagram of a control method for a refrigerator 1 according to an embodiment of the present invention. The defrost control method may include the following steps:

[0041] In step S410 , the defrosting device 330 is activated in a preset time period to defrost the evaporator 320 and drain the defrosted water dripping from the evaporator 320 into the first evaporation dish 340 .

[0042] Step S420: Continuously detect the liquid level of the first evaporating dish 340. Specifically, the liquid level of the first evaporating dish 340 may be detected by a liquid level sensor.

[0043] Step S430 : Determine whether a high liquid level event occurs in which the liquid level of the first evaporating dish 340 is higher than a first liquid level threshold.

[0044] Step S432: When a high liquid level event occurs, the flow path from the first evaporation dish 340 to the second evaporation dish 342 is opened, and the current opening time is recorded.

[0045] Step S440: Determine a preset time period according to the conduction interval between the current conduction moment and the previous conduction moment.

[0046] In step S410, the defrost device 330 is activated according to a preset time period. The preset time period can be changed according to specific circumstances (which will be described in detail below). Those skilled in the art will understand that the preset time period of the defrost device 330 can be the time period between the activation of the defrost device 330 once and the activation of the defrost device 330 next time. In some specific embodiments, the refrigerator 1 may also be configured with a timer for recording the time point of each activation of the defrost device 330, so as to calculate the next activation time of the defrost device 330 based on the activation time point and the preset time period.

[0047] In step S430, the first liquid level threshold can be set based on the height of the first evaporation dish 340. For example, in some specific embodiments, the first liquid level threshold can be set to a ratio of the height of the first evaporation dish 340 between 2 / 3 and 1, such as 2 / 3, 4 / 5, or 1. During the defrost process (which can be considered the period from the start of defrosting to the end of defrosting by the defrost device 330), if the liquid level of the first evaporation dish 340 exceeds the first liquid level threshold, i.e., a high liquid level event has occurred, the system may determine that the evaporator 320 is severely frosted and that there is a risk of defrost water overflowing from the first evaporation dish 340.

[0048] In step S432, when a high liquid level event occurs, the system can control the liquid level switch 346 to open the pipe 344 connecting the first evaporation dish 340 and the second evaporation dish 342, so that the defrost water in the first evaporation dish 340 is promptly transferred to the second evaporation dish 342, thereby avoiding the risk of the defrost water in the first evaporation dish 340 overflowing.

[0049] Of course, if a high liquid level event does not occur, the system may assume that there is little frost on the evaporator 320 and there is no risk of overflow in the first evaporation dish 340. The pipe 344 between the first evaporation dish 340 and the second evaporation dish 342 is disconnected. In other words, the first evaporation dish 340 is solely used to collect and evaporate the defrost water. This not only eliminates the need for the heating device 348 of the second evaporation dish 342, thereby reducing power consumption, but also effectively utilizes the heat discharged by the compressor 310.

[0050] In step S432 , when a high liquid level event occurs, the current turn-on time can be recorded by a timer and recorded in the memory 42 of the refrigerator 1 .

[0051] In step S440, the preset time period is determined based on the duration of the conduction interval between the current conduction moment and the previous conduction moment. That is, the preset time period of the defrost device 330 in the defrosting mode of the present invention is dynamically changed and is determined by the previous two defrosting processes.

[0052] Specifically, the processor 44 can query the time when the flow path of the previous first evaporating pan 340 to the second evaporating pan 342 is turned on in the memory 42, then calculate the on interval between the previous on time and the current on time, and finally determine the preset time period of the next defrosting device 330 according to the on interval, that is, determine the start time of the next defrosting device 330.

[0053] The inventor realizes that the frosting of the evaporator 320 is also related to the required heat load of the food in the storage compartment 14, that is, the greater the heat load of the storage compartment 14, the lower the temperature of the evaporator 320, and the greater the amount of frosting. Generally, the food placed in the storage compartment 14 has a slow update speed; in other words, the user also places the food in the refrigerator 1 in order to obtain a longer storage time, so the heat load in the storage compartment 14 is relatively stable over a period of time.

[0054] As known from the foregoing, the refrigerator 1 of the embodiment first collects defrosting water by using the first evaporating pan 340 when defrosting, and turning on the flow path between the first evaporating pan 340 and the second evaporating pan 342 means that the amount of frosting of the evaporator 320 is large. Therefore, if the time interval between two on events is shorter, it means that the heat load demand of the food in the storage compartment 14 over a period of time is greater, and the amount of frosting of the evaporator 320 is greater, so shortening the preset time period of the defrosting device 330 at this time is beneficial to timely defrosting. Conversely, if the time interval between two on events is longer, it means that the heat load demand of the food in the storage compartment 14 over a period of time is smaller, and the amount of frosting of the evaporator 320 is smaller, so appropriately increasing the preset time period of the defrosting device 330 at this time is beneficial to reducing energy consumption (it should be noted that reducing energy consumption here should include two aspects: one is to reduce the electric energy directly consumed by the defrosting device 330, and the other is to reduce the cold loss of the evaporator 320 due to heating defrosting).

[0055] As can be seen, the defrosting control method of the present application is based on the double-evaporating-pan drainage structure, and creatively adjusts the preset time period of the next defrosting device 330 according to the drainage relationship between the first evaporating pan 340 and the second evaporating pan 342, so that the defrosting device 330 has a high operating frequency when the amount of frosting of the evaporator 320 is large, and has a low operating frequency when the amount of frosting of the evaporator 320 is small, so that the start time of the defrosting device 330 matches the actual operating condition of the refrigerator 1, saves energy on the basis of timely defrosting of the evaporator 320, and has outstanding substantial features and significant progress.

[0056] Furthermore, the step of determining the preset time period based on the conduction interval duration may also include: judging whether the conduction interval duration is greater than the preset interval duration; if so, using the first preset duration as the preset time period; if not, using the second preset duration as the preset time period; and the first preset duration is less than the second preset duration.

[0057] In some specific embodiments, the first preset duration can be configured to be between 2 hours and 8 hours. The second preset duration can be configured to be between 9 hours and 15 hours. For example, the preset interval duration can be set to 100 hours, the first preset duration can be configured to be 6 hours, and the second preset duration can be configured to be 10 hours. When the calculated conduction interval duration between two conduction moments is less than 100 hours, it indicates that the heat load of the refrigerator 1 during this period is high and the amount of frost on the evaporator 320 is large. In this case, the preset time period is assigned a value of 6 hours so that the defrost device 330 can perform the next defrost operation as soon as possible. Conversely, when the calculated conduction interval duration between two conduction moments is greater than 100 hours, it indicates that the heat load of the refrigerator 1 during this period is low and the amount of frost on the evaporator 320 is small. In this case, the preset time period is assigned a value of 10 hours to appropriately increase the preset time period, thereby reducing the activation frequency of the defrost device 330 and saving resources.

[0058] In some embodiments, the step of determining whether the liquid level in the first evaporating dish 340 exceeds the first liquid level threshold further includes: if no high liquid level event occurs, using the first preset duration as the preset time period. That is, if the liquid level in the first evaporating dish 340 remains below the first liquid level threshold during a defrosting process of the defrosting device 330, the system will deem that the heat load of the refrigerator 1 is low during this period, and the amount of frost on the evaporator 320 is small. In this case, the preset time period is assigned a second preset duration, i.e., the preset time period is increased, thereby reducing the activation frequency of the defrosting device 330 and saving resources.

[0059] In some embodiments, after opening the flow path from the first evaporating dish 340 to the second evaporating dish 342 , the step further includes: determining whether the liquid level of the first evaporating dish 340 is lower than a second liquid level threshold; if so, cutting off the flow path from the first evaporating dish 340 to the second evaporating dish 342 ; wherein the second liquid level threshold is lower than the first liquid level threshold.

[0060] In this embodiment, the second liquid level threshold may also be set according to the height of the first evaporating dish 340. For example, in some specific embodiments, the second liquid level threshold may be set to have a ratio to the height of the first evaporating dish 340 of between 1 / 5 and 1 / 3, such as 1 / 5, 1 / 4, 1 / 3, etc.

[0061] After the flow path from the first evaporating dish 340 to the second evaporating dish 342 is established, the defrost water in the first evaporating dish 340 can flow into the second evaporating dish 342. This is because the liquid level in the first evaporating dish 340 drops. When the liquid level drops to the second liquid level threshold, the system determines that the risk of defrost water overflowing from the first evaporating dish 340 has been eliminated and promptly cuts off the flow path from the first evaporating dish 340 to the second evaporating dish 342, thereby saving energy.

[0062] In some embodiments, the step of opening the flow path from the first evaporating dish 340 to the second evaporating dish 342 further includes: opening the liquid level switch 346 and simultaneously activating the heating device 348 in the second evaporating dish 342. Furthermore, the step of closing the flow path from the first evaporating dish 340 to the second evaporating dish 342 further includes: closing the liquid level switch 346 and simultaneously deactivating the heating device 348 in the second evaporating dish 342.

[0063] See also Figure 5 , Figure 5 : is a control flow chart of a refrigerator 1 according to an embodiment of the present invention. In some more detailed embodiments, the defrost control method can also be performed by the following steps:

[0064] Step S501: Start the defrost device 330 in a preset time period.

[0065] Step S502 : detecting the liquid level of the first evaporating dish 340 .

[0066] Step S503 : determining that a high liquid level event occurs, that is, the liquid level value of the first evaporating dish 340 is higher than a first liquid level threshold.

[0067] When the judgment result of step S503 is yes, step S504 is executed to record the current conduction time.

[0068] Step S505 : querying the last time the flow from the first evaporation dish 340 to the second evaporation dish 342 was turned on.

[0069] Step S506: Determine whether the conduction interval between the current conduction moment and the previous conduction moment is less than a preset interval.

[0070] If the judgment result of step S506 is yes, step S508 is executed to use the first preset duration as the preset time period. If the judgment result of step S506 is no, step S509 is executed to use the second preset duration as the preset time period.

[0071] When the judgment result of step S503 is yes, step S510 is executed to turn on the liquid level switch 346 and start the heating device 348.

[0072] Step S511 : determining whether the liquid level of the first evaporating dish 340 is lower than a second liquid level threshold.

[0073] If the determination result of step S511 is yes, step S512 is executed to turn off the liquid level switch 346 and stop the heating device 348 .

[0074] When the determination result of step S503 is no, step S509 is executed, and the second preset time length is used as the preset time period.

[0075] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A defrost control method for a refrigerator, the refrigerator comprising an evaporator, a defrost device for defrosting the evaporator, a first evaporation dish for collecting defrosted water, and a second evaporation dish in controlled communication with the first evaporation dish; The defrost control method comprises: activating the defrost device at a preset time period to defrost the evaporator and draining the defrosted water dripping from the evaporator into the first evaporation dish; Continuously detecting the liquid level value of the first evaporating dish; determining whether a high liquid level event occurs in which the liquid level value of the first evaporating dish is higher than a first liquid level threshold; When the high liquid level event occurs, connecting the flow path from the first evaporation dish to the second evaporation dish, and recording the current connection time; Determining the preset time period according to the conduction interval between the current conduction moment and the previous conduction moment; The step of determining the preset time period according to the conduction interval duration further includes: Determining whether the conduction interval duration is less than a preset interval duration; If so, using the first preset duration as the preset time period; If not, the second preset duration is used as the preset time period; and The first preset time length is shorter than the second preset time length.

2. The defrost control method according to claim 1, wherein: The step of determining whether the liquid level value of the first evaporating dish exceeds a first liquid level threshold further includes: In the case that the high liquid level event does not occur, the second preset time length is used as the preset time period.

3. The defrost control method according to claim 1, wherein: The first preset duration is configured to be between 2 hours and 8 hours; and / or, The second preset duration is configured to be between 9 hours and 15 hours.

4. The defrost control method according to claim 1, wherein: After the step of opening the flow path from the first evaporation dish to the second evaporation dish, the step further includes: determining whether the liquid level value of the first evaporating dish is lower than a second liquid level threshold; If yes, cutting off the flow path from the first evaporating dish to the second evaporating dish; The second liquid level threshold is smaller than the first liquid level threshold.

5. The defrost control method according to claim 1, wherein: The refrigerator further includes a box body and a compressor, wherein the box body defines a compressor compartment, and the compressor is disposed in the compressor compartment; and The first evaporating dish is fixed on the upper part of the compressor to evaporate defrost water using the heat released by the compressor.

6. The defrost control method according to claim 5, wherein: The second evaporating dish is arranged in the press cabin, and a heating device is provided in the second evaporating dish; and The step of opening the flow path from the first evaporation dish to the second evaporation dish further includes: starting the heating device.

7. The defrost control method according to claim 1, wherein: The refrigerator further includes a liquid level switch for controlling a flow path from the first evaporating dish to the second evaporating dish; The step of opening the flow path from the first evaporation dish to the second evaporation dish further includes: turning on the liquid level switch.

8. The defrost control method according to claim 1, wherein: The ratio of the first liquid level threshold to the height of the first evaporating dish is between 2 / 3 and 1.

9. A refrigerator comprising a memory, a processor, and a machine executable program stored in the memory and running on the processor, wherein the processor implements the defrost control method according to any one of claims 1 to 8 when executing the machine executable program.

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