Dehumidifier and control method thereof

Abstract

The application provides a dehumidifier and a control method thereof. The dehumidifier comprises a compressor, an evaporator, a condenser and a fan. The evaporator, the condenser and the fan are arranged in sequence. The control method comprises the following steps: obtaining a self-drying instruction of the dehumidifier; turning off the compressor; controlling the fan to reverse and blow air towards the condenser; judging whether the fan meets a preset forward rotation condition; and if yes, controlling the fan to rotate forward. The dehumidifier can dry the inside of the dehumidifier, solve the mildew and damp problem caused by long-time remaining of condensate water after shutdown, and ensure the health and safety of users.

Description

TECHNICAL FIELD

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

[0002] The dehumidifier utilizes the evaporator to condense the moisture in the air on the surface of the evaporator to form condensate water, which is collected in the water pan and then flows out of the drain. Since the evaporator is still in a state lower than the ambient temperature for a period of time after shutdown, the moisture in the air will continue to condense on the surface of the evaporator. This results in the residual condensate water on the surface of the evaporator coil and fin and in the water pan after shutdown. The condensate water that is not promptly discharged can cause mold growth inside the dehumidifier, and in severe cases, can cause chemical reactions of the evaporator coating, resulting in the air blown by the dehumidifier having an odor, affecting the user's experience and health. SUMMARY

[0003] One object of the first aspect of the present application is to provide a control method of a dehumidifier to solve the problem of mold growth and dampness inside the dehumidifier caused by residual condensate water.

[0004] A further object of the first aspect of the present application is to ensure the drying quality inside the dehumidifier and reduce the energy consumption of drying operation.

[0005] An object of the second aspect of the present application is to provide a dehumidifier using the above control method.

[0006] In particular, according to the first aspect of the present application, the present application provides a control method of a dehumidifier, the dehumidifier comprising a compressor, an evaporator, a condenser and a fan, the evaporator, the condenser and the fan being arranged in sequence, the control method comprising:

[0007] obtaining a self-drying instruction of the dehumidifier;

[0008] turning off the compressor;

[0009] controlling the fan to reverse so as to blow towards the condenser;

[0010] determining whether the fan meets a preset positive rotation condition;

[0011] if yes, controlling the fan to rotate positively.

[0012] Optionally, the step of determining whether the fan meets the preset positive rotation condition comprises:

[0013] obtaining an ambient temperature when the compressor is turned off;

[0014] setting a first running duration of the fan according to the ambient temperature;

[0015] determining whether the reverse running duration of the fan reaches the first running duration;

[0016] If yes, the fan meets the preset positive rotation condition.

[0017] Optionally, the step of determining whether the fan meets the preset positive rotation condition comprises:

[0018] Obtaining a condenser pipe temperature of the condenser and an ambient temperature;

[0019] Determining whether the condenser pipe temperature is less than or equal to the ambient temperature;

[0020] If yes, the fan meets the preset positive rotation condition.

[0021] Optionally, after the step of controlling the fan to rotate positively, the method further comprises:

[0022] Determining whether the fan meets a preset shutdown condition;

[0023] If yes, controlling the fan to stop running.

[0024] Optionally, the step of determining whether the fan meets the preset shutdown condition comprises:

[0025] Obtaining an ambient temperature and an ambient humidity when the fan starts to rotate positively;

[0026] Setting a second running duration of the fan according to the ambient temperature and the ambient humidity;

[0027] Determining whether a positive rotation running duration of the fan reaches the second running duration;

[0028] If yes, the fan meets the preset shutdown condition.

[0029] Optionally, the step of determining whether the fan meets the preset shutdown condition comprises:

[0030] Obtaining an inlet air humidity content and an outlet air humidity content of the dehumidifier;

[0031] Determining whether the outlet air humidity content is continuously less than or equal to the inlet air humidity content;

[0032] If yes, the fan meets the preset shutdown condition.

[0033] Optionally, the inlet air humidity content is determined based on an ambient temperature and an ambient humidity of the dehumidifier at an inlet side; and / or

[0034] The outlet air humidity content is determined based on an ambient temperature and an ambient humidity of the dehumidifier at an outlet side.

[0035] Optionally, after the step of controlling the fan to stop running, the method further comprises:

[0036] Sending prompt information to the user to prompt that the self-drying of the dehumidifier is completed.

[0037] Optionally, after the step of obtaining the self-drying instruction of the dehumidifier, the method further comprises:

[0038] determining whether the dehumidifier has been stopped for a preset time length;

[0039] if yes, performing the step of controlling the fan to rotate forward.

[0040] According to a second aspect of the present application, the present application provides a dehumidifier comprising a processor and a machine executable program stored on a memory and running on the processor, and the processor implements the control method of any one of the above when executing the machine executable program.

[0041] The control method of the dehumidifier of the present application firstly obtains the self-drying instruction of the dehumidifier, then closes the compressor, and then controls the fan to reverse to blow the waste heat of the condenser to the evaporator, reduces the continuous condensation of the moisture in the air on the surface of the evaporator, and reduces the drying operation energy consumption. When the fan meets the forward rotation condition, the fan is controlled to rotate forward. Since the air volume increases when the fan rotates forward, the evaporation speed of the residual condensed water in the evaporator, the condenser and the water pan can be increased, so that the rapid drying of the internal machine is realized, and the use health and safety of the user are effectively ensured.

[0042] Further, in the process of rotating the fan forward, the control method of the dehumidifier of the present application can determine whether the fan meets the preset stop condition. The stop condition can be that the forward rotation time length of the fan reaches a preset second running time length, or the outflow humidity of the dehumidifier is less than or equal to the inflow humidity. When the fan meets the preset stop condition, it indicates that the internal drying of the dehumidifier has been completed. At this time, the fan can be turned off, and the drying quality and drying energy consumption of the dehumidifier are considered. That is, unnecessary drying energy consumption is saved on the premise of ensuring drying quality.

[0043] The above and other objects, advantages and features of the present application will become more apparent from the following detailed description of preferred embodiments thereof, when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0044] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to further aid the full understanding of the preferred embodiments and are, therefore, included herewith. Throughout the drawings, like referenced numerals will be used to designate like parts.

[0045] Figure 1 is a schematic structural diagram of a dehumidifier according to an embodiment of the present application;

[0046] Figure 2 is a schematic diagram of a control method of a dehumidifier according to an embodiment of the present application;

[0047] Figure 3 is a flowchart of a control method of a dehumidifier according to an embodiment of the present application;

[0048] Figure 4 is a flowchart of a control method of a dehumidifier according to another embodiment of the present application.

[0049] Figure 5 is a structural block diagram of a dehumidifier according to an embodiment of the present application.

[0050] Reference numerals: 10, dehumidifier; 110, compressor; 120, evaporator; 130, condenser; 140, fan; 150, water pan; 160, throttling device; 210, processor; 220, memory; 221, machine executable program. DETAILED DESCRIPTION

[0051] Exemplary embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings; however, they are not limited to the same only. While exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood, and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0052] Figure 1 is a schematic structural diagram of a dehumidifier 10 according to an embodiment of the present application, with reference to Figure 1 , the dehumidifier 10 can generally include a compressor 110, an evaporator 120, a condenser 130, a fan 140, a water pan 150, and a throttling device 160, wherein the evaporator 120, the condenser 130, and the fan 140 are arranged in sequence above the water pan 150.

[0053] In the dehumidifying operation, the compressor 110 discharges refrigerant in a high-temperature and high-pressure state, the refrigerant is cooled in the condenser 130, and then becomes in a low-temperature and low-pressure state through the throttling device 160, and is reheated in the evaporator 120 to flow back to the compressor 110. At this time, the surface temperature of the evaporator 120 is lower than the ambient temperature, the surface temperature of the condenser 130 is higher than the ambient temperature, the fan 140 is rotated in the direction away from the condenser 130, and air is discharged after being cooled in the evaporator 120 and heated in the condenser 130 to be slightly higher than the ambient temperature, thereby drying the indoor environment.

[0054] As mentioned above, the evaporator 120 is still below the ambient temperature for a period of time after the dehumidifier 10 is stopped, so the moisture in the air will continue to condense on the surface of the evaporator 120. This results in the condensate remaining on the surface of the coil and fin of the evaporator 120 and the water pan 150 after the dehumidifier 10 is stopped, and the condensate not timely discharged will cause the mold and damp phenomenon in the dehumidifier 10.

[0055] To solve the above problems, the fan 140 of the present application adopts a reversible axial fan 140, that is, when the fan 140 is reversed, the air supply direction is also reversed. When the compressor 110 is just stopped, the fan 140 is reversed, and the air supply sequence is the condenser 130 first and then the evaporator 120. The waste heat in the condenser 130 after the compressor 110 is stopped is fully utilized to quickly heat the evaporator 120 to the ambient temperature level, and the condensation of the moisture in the air on the surface of the evaporator 120 is reduced.

[0056] Since the reversed air volume of the reversible fan 140 is lower than the normal reversed level, the fan 140 can be normal after that, so as to increase the air volume to promote the evaporation and drying of the remaining condensate in the evaporator 120, the condenser 130 and the water pan 150.

[0057] If the condenser 130 has returned to the ambient temperature level after the dehumidifier 10 is stopped for a period of time, there is no waste heat in the condenser 130, and the fan 140 can be directly controlled to be normal at this time, so as to increase the air flow speed between the evaporator 120, the condenser 130 and the water pan 150, thereby promoting the rapid drying of the inside of the dehumidifier 10.

[0058] Figure 2 is a schematic flow chart of a control method of the dehumidifier 10 according to an embodiment of the present application, with reference to Figure 2 The control method of the dehumidifier 10 of the present application at least includes the following steps S202 to S210.

[0059] In step S202, a self-drying instruction of the dehumidifier 10 is obtained.

[0060] In step S204, the compressor 110 is turned off.

[0061] In step S206, the fan 140 is controlled to be reversed, and air is blown to the condenser 130.

[0062] In step S208, it is judged whether the fan 140 meets the preset normal condition.

[0063] In step S210, if yes, the fan 140 is controlled to be normal.

[0064] The control method of the dehumidifier 10 of the application firstly acquires the self-drying instruction of the dehumidifier 10, then closes the compressor 110, and controls the fan 140 to reverse to blow the waste heat of the condenser 130 to the evaporator 120, so as to reduce the continuous condensation of the moisture in the air on the surface of the evaporator 120 and reduce the energy consumption of the drying operation, and controls the fan 140 to rotate forward when the fan 140 meets the forward rotation condition, so that the evaporation speed of the residual condensed water in the evaporator 120, the condenser 130 and the water pan 150 can be increased due to the increase of the air volume when the fan 140 rotates forward, so as to realize the rapid drying of the internal part of the whole machine and effectively ensure the health and safety of the user.

[0065] In an optional embodiment of the application, the step of judging whether the fan 140 meets the preset forward rotation condition can be: acquiring the ambient temperature when the compressor 110 is closed, then setting the first running time of the fan 140 according to the ambient temperature, and then judging whether the reverse running time of the fan 140 reaches the first running time, if the reverse running time reaches the first running time, it indicates that the fan 140 has met the preset forward rotation condition.

[0066] Specifically, the setting of the first running time of the fan 140 according to the ambient temperature can be that the first running time is searched from the preset corresponding relationship table according to the ambient temperature, for example, when the ambient temperature is (30, 40℃], (20, 30℃], (10, 20℃] and (5, 10℃] respectively, the corresponding first running time is 5, 4, 3 and 2 min respectively. This is because under the same wind speed condition, the lower the ambient temperature, the faster the cooling speed of the condenser 130 after shutdown, the less the waste heat utilization time, and therefore the shorter the first running time.

[0067] In another optional embodiment of the application, the step of judging whether the fan 140 meets the preset forward rotation condition can also be: acquiring the condenser pipe temperature of the condenser 130 and the ambient temperature, and then judging whether the condenser pipe temperature is less than or equal to the ambient temperature, if the condenser pipe temperature is less than or equal to the ambient temperature, it indicates that the fan 140 has met the preset forward rotation condition.

[0068] Specifically, the condenser pipe temperature can be monitored in real time by the temperature sensor arranged around the condenser pipe, when the condenser pipe temperature is less than or equal to the ambient temperature, it indicates that the waste heat of the condenser 130 cannot be used to dry the evaporator 120 thereafter, because the condenser pipe has no waste heat available, and the fan 140 can be controlled to start rotating forward.

[0069] After the step of controlling the fan 140 to rotate forward, it is further judged whether the fan 140 meets the preset shutdown condition, and when the fan 140 meets the preset shutdown condition, the fan 140 is controlled to stop running, so as to ensure that the drying of the internal part of the dehumidifier 10 is completed thoroughly.

[0070] In an optional embodiment of the present application, the step of determining whether the fan 140 meets the preset shutdown condition can be: obtaining the ambient temperature and the ambient humidity when the fan 140 starts to rotate (when the rotation direction is switched), then setting the second running duration of the fan 140 according to the ambient temperature and the ambient humidity, and then determining whether the running duration of the fan 140 reaches the second running duration. If the running duration of the fan 140 reaches the second running duration, it indicates that the fan 140 has met the preset rotation condition.

[0071] Specifically, under the same wind speed condition, the higher the ambient temperature (dry bulb temperature) and the smaller the ambient humidity (relative humidity), the faster the condensate evaporation rate, and the shorter the drying time. Conversely, the slower the condensate evaporation rate, the longer the drying time. Therefore, the corresponding relationship between the ambient temperature, the ambient humidity and the second running duration can be as shown in Table 1:

[0072] Ambient temperature (°C) / Ambient humidity ≤40％ (40％，60％] ≥60％ (30，40] 3 min 4 min 5 min (20，30] 4 min 5 min 6 min (5，20] 5 min 6 min 7 min

[0073] Table 1

[0074] In another optional embodiment of the present application, the step of determining whether the fan 140 meets the preset shutdown condition can also be: obtaining the inlet humidity content and the outlet humidity content of the dehumidifier 10, and then determining whether the outlet humidity content is continuously less than or equal to the inlet humidity content. If the outlet humidity content is continuously less than or equal to the inlet humidity content, it indicates that the fan 140 has met the preset shutdown condition.

[0075] Specifically, the inlet humidity content can be determined based on the ambient temperature and the ambient humidity of the dehumidifier 10 at the inlet side. The outlet humidity content can be determined based on the ambient temperature and the ambient humidity of the dehumidifier 10 at the outlet side. In order to ensure that the drying inside the dehumidifier 10 is completed, it is required that the outlet humidity content must be continuously less than or equal to the inlet humidity content, and the continuous time can be 60s-120s, such as 90s, so as to prevent the dehumidifier 10 from being incorrectly determined as having completed drying due to the instantaneous outlet humidity content being less than or equal to the inlet humidity content.

[0076] In a specific embodiment of the present application, the inlet and outlet humidity contents can be obtained by calculating based on the operating ambient temperature and the ambient humidity of the dehumidifier 10 and the data in the preset data table. The preset data table is the saturation humidity content corresponding to different ambient dry temperatures, and can refer to Table 2 for details.

[0077] Ambient temperature (°C) 5 6 7 8 9 … 40 Saturated moisture content d (g / kg) 5.4 5.79 6.21 6.66 7.13 … 48.88

[0078] Table 2

[0079] The specific calculation method of the inlet humidity content can be: obtaining the ambient temperature and the ambient humidity of the inlet side when the fan 140 rotates by the temperature and humidity sensor at the inlet side, searching the preset data table to obtain the saturation humidity content under the ambient temperature, and then the inlet humidity content d = saturation humidity content.进 = d 饱 x RH 进 .

[0080] The specific calculation method of the outlet humidity content can be: obtaining the environment temperature and the environment humidity of the outlet side when the fan 140 is rotating in real time by the temperature and humidity sensor of the outlet side, searching the preset data table to obtain the saturated humidity content at the environment temperature, and then the outlet humidity content d 出 = d 饱 x RH 出 .

[0081] Since the condensate water remaining on the surface of the evaporator 120 and the water pan 150 evaporates, the air humidity content inside the dehumidifier 10 is increased, which causes the outlet humidity content to be greater than the inlet humidity content. When the outlet humidity content is less than or equal to the inlet humidity content, it means that the condensate water has been evaporated. Therefore, if the difference between the outlet humidity content and the inlet humidity content is less than or equal to 0 g / kg for 90 s, that is, d 出 -d 进 ≤ 0 g / kg, it proves that the condensate water has been completely evaporated.

[0082] After the step of controlling the fan 140 to stop running, a prompt information that the self-drying of the dehumidifier 10 is completed can be sent to the user, so as to inform the user that the self-drying task of the dehumidifier 10 has been completed. The prompt information includes but is not limited to the flickering of the indicator light, the voice prompt, etc.

[0083] When the dehumidifier 10 is in the shutdown state, if the dehumidifier 10 has been shut down for a period of time, at this time, the condenser 130 has been restored to the ambient temperature level, and there is no residual heat at the condenser 130. If the fan 140 is continued to be controlled to reverse, not only the better drying effect cannot be achieved, but also the drying energy consumption is increased.

[0084] Therefore, after the step of obtaining the self-drying instruction of the dehumidifier 10, it can be further judged whether the dehumidifier 10 has been shut down for a preset time length. If the dehumidifier 10 has been shut down for the preset time length, it indicates that the evaporator 120 has been restored to the ambient temperature level. At this time, the step of controlling the fan 140 to rotate in the positive direction can be directly executed to utilize the positive rotation of the fan 140 for drying.

[0085] Figure 3 is a flow chart of the control method of the dehumidifier 10 according to an embodiment of the present application, referring to Figure 3 , the control method can include the following steps S302 to S316.

[0086] Step S302, obtaining a self-drying instruction of the dehumidifier 10.

[0087] Step S304, closing the compressor 110.

[0088] Step S306, control the fan 140 to reverse, so that it blows toward the condenser 130.

[0089] Step S308, determine whether the reverse running time of the fan 140 reaches the first running time, if yes, execute step S310, if no, continue to wait.

[0090] Step S310, control the fan 140 to rotate forward.

[0091] Step S312, determine whether the forward running time of the fan 140 reaches the second running time, if yes, execute step S314, if no, continue to wait.

[0092] Step S314, control the fan 140 to stop running.

[0093] Step S316, send the user a prompt information prompting the completion of the self-drying of the dehumidifier 10.

[0094] Figure 4 is a flow chart of a control method of the dehumidifier 10 according to another embodiment of the present application, referring to Figure 4 , the control method can include the following steps S402 to S416.

[0095] Step S402, obtain the self-drying instruction of the dehumidifier 10.

[0096] Step S404, turn off the compressor 110.

[0097] Step S406, control the fan 140 to reverse, so that it blows toward the condenser 130.

[0098] Step S408, determine whether the condenser pipe temperature is less than or equal to the ambient temperature, if yes, execute step S410, if no, continue to wait.

[0099] Step S410, control the fan 140 to rotate forward.

[0100] Step S412, determine whether the outflow humidity continues to be less than or equal to the inflow humidity, if yes, execute step S414, if no, continue to wait.

[0101] Step S414, control the fan 140 to stop running.

[0102] Step S416, send the user a prompt information prompting the completion of the self-drying of the dehumidifier 10.

[0103] The present application also provides a dehumidifier 10, Figure 5 is a structural block diagram of the dehumidifier 10 according to an embodiment of the present application, referring to Figure 5The dehumidifier 10 can include a processor 210 and a machine executable program 221 stored on a memory 220 and running on the processor 210, and the processor 210 implements the control method of any of the dehumidifiers 10 described above when executing the machine executable program 221.

[0104] The processor 210 can be a central processing unit (CPU) or a digital processing unit, etc. The processor 210 transmits and receives data through a communication interface. The memory 220 is used to store the machine executable program 221. The memory 220 is any medium capable of carrying or storing desired program codes in the form of instructions or data structures and capable of being accessed by a computer, and can also be a combination of multiple memories 220. The machine executable program 221 described above can be downloaded from a computer readable storage medium to a corresponding computing / processing device or downloaded and installed to the dehumidifier 10 via a network (such as the Internet, a local area network, a wide area network, and / or a wireless network).

[0105] In summary, the present application is directed to the problem of internal moisture and mildew caused by the residual condensate on the surface of the evaporator 120 and the water pan 150 after the dehumidifier 10 is stopped, and through reasonable control of the forward and reverse rotation of the fan 140, the dehumidifier 10 can dry its own interior, ensuring the health and safety of users, saving the labor burden of manually cleaning the interior of the dehumidifier 10, and being suitable for popularization and use.

[0106] According to any one of the above optional embodiments or a combination of multiple optional embodiments, the embodiments of the present application can achieve the following beneficial effects:

[0107] The control method of the dehumidifier 10 of the present application first acquires the self-drying instruction of the dehumidifier 10, then closes the compressor 110, and then controls the fan 140 to reverse so that it blows air towards the condenser 130, blows the residual heat of the condenser 130 to the evaporator 120, reduces the continuous condensation of moisture in the air on the surface of the evaporator 120, and reduces the energy consumption of the drying operation. When the fan 140 meets the forward rotation condition, the fan 140 is controlled to rotate forward. Since the air volume increases when the fan 140 rotates forward, the evaporation speed of the residual condensate in the evaporator 120, the condenser 130 and the water pan 150 can be increased, so that the interior of the whole machine is quickly dried, and the health and safety of users are effectively ensured.

[0108] Further, the control method of the dehumidifier 10 can determine whether the fan 140 meets a preset stop condition during the forward rotation of the fan 140. The stop condition can be that the fan 140 runs for a preset second running time length or the humidity content of the outlet air of the dehumidifier 10 is continuously less than or equal to the humidity content of the inlet air. When the fan 140 meets the preset stop condition, it indicates that the inside of the dehumidifier 10 has been dried, and the fan 140 can be turned off at this time, which balances the drying quality and drying energy consumption of the dehumidifier 10, that is, unnecessary drying energy consumption is saved under the premise of ensuring the drying quality.

[0109] Those skilled in the art should understand that, without special indication, the terms used to represent the position or positional relationship in the embodiments of the present application are based on the actual use state of the dehumidifier 10, and these terms are only for the convenience of describing and understanding the technical solutions of the present application, and are not intended to indicate or imply that the device or component referred to must have a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0110] Unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly specified. Those skilled in the art should be able to understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0111] In the description of the embodiments, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0112] So far, those skilled in the art should realize that although the present application has been shown and described in detail in the above embodiments, many other variants or modifications in accordance with the principles of the present application can be directly determined or deduced from the disclosure of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variants or modifications.

Claims

1. A control method of a dehumidifier, the dehumidifier comprising a compressor, an evaporator, a condenser and a fan, the evaporator, the condenser and the fan being arranged in sequence, the control method comprising: obtaining a self-drying instruction of the dehumidifier; turning off the compressor; controlling the fan to reverse, so as to blow air towards the condenser; determining whether the fan meets a preset positive rotation condition; if yes, controlling the fan to rotate positively; wherein the step of determining whether the fan meets the preset positive rotation condition comprises: obtaining an ambient temperature when the compressor is turned off; setting a first running time length of the fan according to the ambient temperature; determining whether a reverse running time length of the fan reaches the first running time length; if yes, the fan meets the preset positive rotation condition; or the step of determining whether the fan meets the preset positive rotation condition comprises: obtaining a condenser tube temperature of the condenser and an ambient temperature; determining whether the condenser tube temperature is less than or equal to the ambient temperature; if yes, the fan meets the preset positive rotation condition.

2. The control method according to claim 1, wherein after the step of controlling the fan to rotate positively, further comprising: determining whether the fan meets a preset shutdown condition; if yes, controlling the fan to stop running.

3. The control method according to claim 2, wherein the step of determining whether the fan meets the preset shutdown condition comprises: obtaining an ambient temperature and an ambient humidity when the fan starts to rotate positively; setting a second running time length of the fan according to the ambient temperature and the ambient humidity; determining whether a positive rotation running time length of the fan reaches the second running time length; if yes, the fan meets the preset shutdown condition.

4. The control method according to claim 3, wherein the step of determining whether the fan meets the preset shutdown condition comprises: obtaining an inlet air humidity content and an outlet air humidity content of the dehumidifier; determining whether the outlet air humidity content is continuously less than or equal to the inlet air humidity content; if yes, the fan meets the preset shutdown condition. 5.The control method according to claim 4, wherein: the inlet air humidity content is determined based on an ambient temperature and an ambient humidity of the dehumidifier at an inlet air side; and / or the outlet air humidity content is determined based on an ambient temperature and an ambient humidity of the dehumidifier at an outlet air side.

6. The control method according to claim 4, wherein after the step of controlling the fan to stop running, further comprising: sending prompt information to a user to prompt that the self-drying of the dehumidifier is completed.

7. The control method according to claim 1, wherein after the step of obtaining the self-drying instruction of the dehumidifier, further comprising: determining whether the dehumidifier has been shut down for a preset time length; if yes, performing the step of controlling the fan to rotate positively. 8.A dehumidifier comprising a processor and a machine executable program stored on a memory and running on the processor, and the processor implements the control method according to any one of claims 1 to 7 when executing the machine executable program.

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