Dehumidifier and control method thereof

Abstract

The present application relates to the technical field of household appliances, in particular to a dehumidifier and a control method thereof. The control method of the dehumidifier comprises: obtaining a first temperature of an evaporator; determining an actual frost accumulation time according to whether the first temperature is less than a first preset temperature; and judging whether the evaporator meets a first defrosting condition according to the actual frost accumulation time. According to the present application, whether the evaporator meets the first defrosting condition is judged according to the actual frost accumulation time, which can improve the accuracy of defrosting judgment, thereby reducing the possibility of invalid defrosting, and further avoiding the problem of dehumidification efficiency reduction caused by too long defrosting time.

Description

TECHNICAL FIELD

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

[0002] At present, when the dehumidifier is running, the temperature of the evaporator surface will decrease with the decrease of the ambient temperature, especially under the condition of medium and low temperature, the temperature of the evaporator will even decrease to below 0℃, and after running in this state for a period of time, the condensate water is easy to frost or even freeze on the evaporator surface, and the frost layer with increasing thickness not only hinders the heat transfer between the evaporator and the air, but also reduces the circulation area of the air supply, eventually leading to serious attenuation of the dehumidification capacity, and the dehumidifier has to perform defrosting operation.

[0003] The existing dehumidifier defrosting method mainly determines through the evaporator coil temperature, and performs defrosting action after a fixed preset time, that is, when the evaporator coil temperature is lower than a certain preset temperature, it means that the evaporator has the risk of frosting, and after a fixed preset time, the frost layer has basically formed, so the defrosting action is performed. Due to different temperature and humidity of dehumidifier running conditions, the frosting speed on the surface of the evaporator is different; the thickness of the frost layer after a fixed preset time is different, and the preset time is too long, which will lead to too thick frost layer under the condition of low temperature and high humidity, and serious attenuation of dehumidification capacity; the preset time is too short, which will lead to that the actual frost layer is not formed or the frost layer is too thin under the condition of medium temperature and low humidity, and the defrosting time ratio in the running cycle increases, so the dehumidification efficiency decreases. Therefore, the influence of the running environment on the growth of the frost layer is ignored during the current frosting determination, which leads to that the frosting determination does not match the actual frosting condition, and the defrosting cycle ratio is unreasonable; that is to say, the existing defrosting determination method has the problem of low accuracy of defrosting determination, which easily leads to invalid defrosting caused by defrosting misjudgment. SUMMARY

[0004] In view of the above problems, the present application is proposed to provide a dehumidifier and a control method thereof which can overcome the above problems or at least partially solve the above problems, and aims to solve the problem of low accuracy of defrosting determination of the existing dehumidifier, so as to achieve the purpose of improving the accuracy of defrosting determination.

[0005] In one aspect, the present application provides a control method of a dehumidifier, comprising:

[0006] obtaining a first temperature of an evaporator;

[0007] determining an actual frosting accumulation time according to whether the first temperature is less than a first preset temperature;

[0008] judging whether the evaporator meets a first defrosting condition according to the actual frosting accumulation time.

[0009] Optionally, the control method further comprises:

[0010] Get the running time of dehumidification;

[0011] It is determined whether the evaporator meets a second defrost condition according to the operating time and the first defrost condition.

[0012] Optionally, the control method further includes:

[0013] The second temperature of the evaporator is obtained, and when the second temperature of the evaporator is less than the second preset temperature, the first temperature of the evaporator is obtained, and the dehumidification operation time is obtained.

[0014] Optionally, the step of obtaining the first temperature of the evaporator and determining the actual frost accumulation time according to whether the first temperature is less than a first preset temperature includes:

[0015] Acquire a second temperature of the evaporator. When the second temperature of the evaporator is less than the second preset temperature:

[0016] Start timing, and

[0017] obtaining a first temperature of the evaporator every first preset time, and determining whether the first temperature is less than a first preset temperature; if so, increasing the actual frost accumulation time by the first preset time;

[0018] The step of judging whether the evaporator satisfies the first defrost condition according to the actual frost accumulation time includes: when the actual frost accumulation time is greater than or equal to the second preset time, the evaporator satisfies the first defrost condition;

[0019] The step of obtaining the dehumidification operation time includes:

[0020] Acquire a second temperature of the evaporator. When the second temperature of the evaporator is less than the second preset temperature:

[0021] Start timing, and

[0022] Acquire the first temperature of the evaporator every first preset time, and increase the operating time by the first preset time;

[0023] The determining whether the evaporator meets the second defrost condition according to the operating time and the first defrost condition includes:

[0024] When the evaporator meets the first defrost condition, it is determined whether the ratio of the actual frost accumulation time to the operating time is greater than or equal to a preset ratio; if so, it is determined that the evaporator meets the second defrost condition.

[0025] Optionally, after determining whether the ratio of the actual frost accumulation time to the operating time is greater than or equal to a preset ratio, the method further includes:

[0026] If the ratio of the actual frost accumulation time to the running time is less than the preset ratio, the running time and the actual frost accumulation time are corrected, and the first temperature of the evaporator and the running time are continuously acquired until the evaporator meets the first defrosting condition and the second defrosting condition.

[0027] Optionally, the control method further comprises:

[0028] When the second temperature of the evaporator is less than the second preset temperature, a first dry-bulb temperature and a first relative humidity of a running environment are acquired;

[0029] The second preset time is assigned a value according to the first dry-bulb temperature and the first relative humidity;

[0030] The first dry-bulb temperature is inversely related to the second preset time, and the first relative humidity is positively related to the second preset time.

[0031] Optionally, when the evaporator meets the first defrosting condition, or when the evaporator meets the second defrosting condition, the evaporator is defrosted;

[0032] The defrosting of the evaporator comprises:

[0033] The refrigerant is controlled to circulate in a first direction, and / or the fan is controlled to rotate in a second direction, wherein the first direction is opposite to the direction of circulation of the refrigerant when the dehumidifier is running in a dehumidifying mode, and the second direction is opposite to the direction of rotation of the fan when the dehumidifier is running in the dehumidifying mode.

[0034] Optionally, the defrosting of the evaporator further comprises:

[0035] Before the refrigerant is controlled to circulate in the first direction and / or the fan is controlled to rotate in the second direction, a first running frequency of the compressor and a fourth temperature of the evaporator are acquired;

[0036] When the refrigerant is controlled to circulate in the first direction and the fan is controlled to rotate in the second direction, the compressor is controlled to run at a preset frequency, and the preset frequency is inversely related to the fourth temperature of the evaporator.

[0037] Optionally, the defrosting of the evaporator further comprises:

[0038] Before the refrigerant is controlled to circulate in the first direction and / or the fan is controlled to rotate in the second direction, a second dry-bulb temperature of a running environment is acquired;

[0039] After the compressor is controlled to run at the preset frequency, the method further comprises:

[0040] A third temperature of the evaporator is acquired.

[0041] determining whether the third temperature is greater than or equal to a third preset temperature, the third preset temperature being positively correlated with the second dry-bulb temperature;

[0042] If yes, after a third preset time, controlling the dehumidifier to perform a dehumidifying operation, the compressor operating at a first operating frequency.

[0043] The application further provides a dehumidifier comprising a control device, the control device comprising a memory and a processor, the memory storing a control program, the control program being executed by the processor to implement the control method of any one of the above dehumidifiers.

[0044] The control method of the application determines the actual frost accumulation time according to whether the first temperature is less than the first preset temperature, the actual frost accumulation time representing the actual frost accumulation time of the evaporator. Therefore, the application determines whether the evaporator meets the first defrosting condition according to the actual frost accumulation time, which can improve the accuracy of defrosting determination, thereby reducing the possibility of invalid defrosting, and further avoiding the problem of reduced dehumidifying efficiency due to too long defrosting time.

[0045] Therefore, the above and other objects, advantages and features of the application will become more apparent from the following detailed description of some embodiments thereof, when taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0046] Some specific embodiments of the application will be described in detail below with reference to the accompanying drawings, which are presented by way of illustration and not of limitation. Like reference numerals designate like parts or portions throughout the drawings. It should be understood that the drawings are not necessarily to scale. In the drawings:

[0047] Figure 1 is a schematic flow chart of a control method of a dehumidifier according to an embodiment of the application;

[0048] Figure 2 is a schematic flow chart of a control method of a dehumidifier according to another embodiment of the application;

[0049] Figure 3 is a schematic flow chart of a control method of a dehumidifier according to another embodiment of the application;

[0050] Figure 4 is a schematic schematic diagram of a dehumidifier according to an embodiment of the application;

[0051] Figure 5 is a schematic schematic diagram of a dehumidifier according to another embodiment of the application;

[0052] Figure 6 is a schematic use state diagram of a dehumidifier in a defrosting operation according to an embodiment of the present application;

[0053] Figure 7 is a schematic use state diagram of a dehumidifier in a defrosting operation according to an embodiment of the present application. DETAILED DESCRIPTION

[0054] In the description of the present embodiments, it should be noted that the terms "one embodiment", "some embodiments", "certain embodiments" or "some examples", among others, likely mean that a particular implementation described in connection with the embodiment or example is included in at least one embodiment or example of the present application. The illustrative description of the above terms in the specification does not necessarily refer to the same embodiment or example. Moreover, the particular features, structures, materials, or characteristics described in connection with the embodiment or example can be combined in any suitable manner in one or more embodiments or examples.

[0055] Figure 1 is a schematic flow chart of a control method of a dehumidifier according to an embodiment of the present application, and in combination with Figures 2-7 The present application provides a control method of a dehumidifier, which comprises the following steps:

[0056] Step S11, obtaining a first temperature of an evaporator; Step S12, determining an actual frost accumulation time according to whether the first temperature is less than a first preset temperature;

[0057] Step S13, judging whether the evaporator meets a first defrosting condition according to the actual frost accumulation time.

[0058] Specifically, the first temperature of the evaporator can be a first temperature of an evaporator coil. The actual frost accumulation time refers to an accumulated time of actual frost occurrence of the evaporator.

[0059] In the present embodiment, since the actual frost accumulation time is determined according to whether the first temperature is less than the first preset temperature, the actual frost accumulation time represents the accumulated time of actual frost occurrence of the evaporator. Therefore, the present application judges whether the evaporator meets the first defrosting condition according to the actual frost accumulation time, which can improve the accuracy of defrosting judgment, thereby reducing the possibility of invalid defrosting, and further avoiding the problem of dehumidification efficiency reduction caused by too long defrosting time.

[0060] Further, in some optional embodiments of the present application, the control method further comprises the following steps: obtaining a second temperature of the evaporator, and entering the step of obtaining the first temperature of the evaporator when the second temperature of the evaporator is less than a second preset temperature.

[0061] As Figure 2As shown, the present application provides a control method of a dehumidifier, which comprises the following steps:

[0062] In step S21, a first temperature of the evaporator is obtained, specifically, the temperature of the evaporator is obtained, and the obtained result is the first temperature.

[0063] In step S22, whether the actual frost accumulation time is less than a first preset temperature is determined according to the first temperature.

[0064] In step S23, whether the evaporator meets a first defrosting condition is determined according to the actual frost accumulation time.

[0065] In step S24, a running time of dehumidification is obtained.

[0066] In step S25, whether the evaporator meets a second defrosting condition is determined according to the running time and the first defrosting condition.

[0067] In this embodiment, the control method of the dehumidifier comprises the first defrosting condition and the second defrosting condition, and defrosting is started only when the first defrosting condition and the second defrosting condition are met at the same time. That is to say, in this embodiment, whether the evaporator meets the first defrosting condition is determined first, and whether the evaporator meets the second defrosting condition is determined after the evaporator meets the first defrosting condition.

[0068] The design principle of this embodiment is that if the actual frost accumulation time meets the first determination condition only in a long running time, the actual frost layer may not be formed or the frost layer may be too thin. In order to avoid the above situation, in this embodiment, whether the evaporator meets the second defrosting condition is determined according to the running time and the first defrosting condition, and defrosting is performed only when the second defrosting condition is met. Therefore, through the above setting, this embodiment can avoid the situation that the actual frost accumulation time meets the first determination condition only in a long running time, so as to avoid the situation that the actual frost layer is not formed or the frost layer is too thin, and further improve the accuracy of defrosting determination and avoid invalid defrosting.

[0069] Further, in some optional embodiments of the present application, the control method further comprises the following steps: obtaining a second temperature of the evaporator, entering the step of obtaining the first temperature of the evaporator when the second temperature of the evaporator is less than the second preset temperature, and obtaining the running time of dehumidification.

[0070] Specifically, the step of obtaining the second temperature of the evaporator refers to obtaining the temperature of the evaporator, and the obtained result is the second temperature. The second preset temperature is greater than or equal to the first preset temperature. For example, the first preset temperature and the second preset temperature are both 0℃; or the first preset temperature is less than 0℃ (for example, -1℃, -1.5℃ or -2℃), and the second preset temperature is 0℃.

[0071] In the embodiment, when the second temperature of the evaporator is less than the second preset temperature, it indicates that the evaporator has the risk of frosting, therefore, when the second temperature of the evaporator is less than the second preset temperature, the first temperature of the evaporator is acquired and the running time length of dehumidification is acquired. That is, when the second temperature of the evaporator is less than the second preset temperature, the determination of the frosting condition is started.

[0072] In some optional embodiments of the present application, the first temperature of the evaporator is acquired, and whether the actual frosting accumulation time is determined according to whether the first temperature is less than the first preset temperature, comprising: acquiring the second temperature of the evaporator, when the second temperature of the evaporator is less than the second preset temperature: starting timing, and acquiring the first temperature of the evaporator every first preset time, and determining whether the first temperature is less than the first preset temperature, if yes, the actual frosting accumulation time is increased by the first preset time.

[0073] In the embodiment, the calculation method of the actual frosting accumulation time is reasonable, and can be realized, and can accurately reflect the actual frosting accumulation time.

[0074] In some optional embodiments of the present application, whether the evaporator meets the first frosting condition is determined according to the actual frosting accumulation time, comprising: when the actual frosting accumulation time is greater than or equal to the second preset time, the evaporator meets the first frosting condition.

[0075] Specifically, the second preset time is a preset frosting accumulation time.

[0076] In some optional embodiments of the present application, the running time length of dehumidification is acquired, comprising: acquiring the second temperature of the evaporator, when the second temperature of the evaporator is less than the second preset temperature: starting timing, and acquiring the first temperature of the evaporator every first preset time, and increasing the running time length by the first preset time.

[0077] In some optional embodiments of the present application, whether the evaporator meets the second frosting condition is determined according to the running time length and the first frosting condition, comprising: when the evaporator meets the first frosting condition, determining whether the ratio of the actual frosting accumulation time to the running time length is greater than or equal to a preset ratio; if yes, it is determined that the evaporator meets the second frosting condition.

[0078] Specifically, when the actual frosting accumulation time is greater than or equal to the second preset time, it is determined whether the ratio of the actual frosting accumulation time to the running time length is greater than or equal to a preset ratio; if the ratio of the actual frosting accumulation time to the running time length is greater than or equal to a preset ratio, it is determined that the evaporator meets the second frosting condition.

[0079] In the embodiment, through the above setting, not only can the influence of the first temperature of the evaporator fluctuating up and down at the first preset temperature on the actual frost accumulation time determination be avoided, but also the case that the actual frost accumulation time meets the first determination condition only in a longer running duration can be excluded, so that the case that the actual frost layer is not formed or the frost layer is too thin can be avoided, and the accuracy of the defrosting determination is further improved, invalid defrosting is avoided, and in addition, the proportion of the defrosting cycle is reasonably optimized, and the dehumidification efficiency under the low-temperature working condition of the dehumidifier is increased.

[0080] For example, the preset ratio represents the proportion of the total duration of the evaporator being lower than the first preset temperature in the running duration, and the proportion should be at least greater than 50% (for example, 50%, 55%, 60%, 65%, 70%, 80%, or 85%).

[0081] In some optional embodiments of the present application, the first preset temperature and the second preset temperature are both 0℃, the first preset time is 10S, the second preset time is 60S, and the preset ratio is 80%.

[0082] In the embodiment, the calculation method of the actual frost accumulation time and the running duration is shown in Table 1 and Table 2.

[0083] Table 1

[0084]

[0085] As shown in Table 1, when the actual frost accumulation time is equal to the second preset time (i.e., the evaporator meets the first defrosting condition), the ratio of the actual frost accumulation time to the running duration is 0.6, which is less than the preset ratio 0.8, and therefore, it is determined that the evaporator does not meet the second defrosting condition.

[0086] Table 2

[0087]

[0088] As shown in Table 2, when the actual frost accumulation time is equal to the second preset time (i.e., the evaporator meets the first defrosting condition), the ratio of the actual frost accumulation time to the running duration is 0.857, which is greater than the preset ratio 0.8, and therefore, it is determined that the evaporator meets the second defrosting condition.

[0089] Further, in some optional embodiments of the present application, after determining whether the ratio of the actual frost accumulation time to the running duration is greater than or equal to the preset ratio, the method further includes: if the ratio of the actual frost accumulation time to the running duration is less than the preset ratio, the running duration and the actual frost accumulation time are corrected, and the first temperature of the evaporator and the running duration are continuously acquired until the evaporator meets the first defrosting condition and the second defrosting condition.

[0090] In the embodiment, the modifying the running time and the actual frost accumulation time comprises: reducing the current running time and the actual frost accumulation time by a first preset time.

[0091] For example, the first preset temperature and the second preset temperature are both 0℃, and the first preset time is 10S. When the evaporator meets the first defrosting condition, if the ratio of the actual frost accumulation time to the running time is less than the preset ratio, the current running time and the actual frost accumulation time are both reduced by the first preset time, and the actual frost accumulation time and the running time are continuously calculated until the evaporator meets the first defrosting condition and the second defrosting condition.

[0092] In some optional embodiments of the application, the control method further comprises: obtaining a first dry-bulb temperature and a first relative humidity of a running environment when the second temperature of the evaporator is less than the second preset temperature; and assigning a value to the second preset time according to the first dry-bulb temperature and the first relative humidity; the first dry-bulb temperature is inversely related to the second preset time, and the first relative humidity is positively related to the second preset time.

[0093] Specifically, the second preset time is a preset frost accumulation time. Since the preset frost accumulation time is determined by the first dry-bulb temperature and the first relative humidity of the running environment of the dehumidifier, the lower the first dry-bulb temperature and the greater the humidity detection value, the faster the frost layer grows, and the shorter the preset frost accumulation time, and vice versa.

[0094] In the embodiment, the first dry-bulb temperature and the first relative humidity of the running environment are obtained by a temperature and humidity sensor arranged on the shell of the dehumidifier. In some alternative embodiments, the first dry-bulb temperature of the running environment is obtained by a temperature sensor arranged on the shell of the dehumidifier, and the first relative humidity of the running environment is obtained by a humidity sensor arranged on the shell of the dehumidifier.

[0095] For example, the corresponding relationship between the second preset time (the preset frost accumulation time) and the temperature and humidity monitoring value is shown in Table 3.

[0096] Table 3

[0097]

[0098] In some optional embodiments of the application, the evaporator is defrosted when the evaporator meets the first defrosting condition, or when the evaporator meets the second defrosting condition.

[0099] The defrosting of the evaporator comprises: controlling the refrigerant to circulate in a first direction, and controlling the fan to rotate in a second direction, wherein the first direction is opposite to the circulating direction of the refrigerant during the dehumidification operation of the dehumidifier, and the second direction is opposite to the rotating direction of the fan during the dehumidification operation of the dehumidifier.

[0100] Specifically, during the defrosting operation, the refrigerant discharged by the compressor passes through the evaporator, the throttling device and the condenser of the dehumidifier in sequence and returns to the compressor, and the air flow passes through the condenser and then the evaporator, the high-temperature refrigerant is condensed and radiated in the evaporator (which functions as a condenser at this time) to quickly defrost the frost on the evaporator, and then the refrigerant is evaporated and absorbs heat in the condenser (which functions as an evaporator at this time) to reduce the temperature and dehumidify, thereby achieving complete defrosting and ensuring the normal operation of the dehumidification function.

[0101] Therefore, compared with the method of defrosting by controlling the compressor to stop and the fan to continue to operate, on the one hand, in the embodiment, the refrigerant is controlled to circulate in a first direction during the defrosting of the evaporator, which utilizes the high-temperature and high-pressure refrigerant of the compressor to defrost the evaporator, and the temperature of the refrigerant discharged by the compressor is obviously higher than the ambient temperature, which can significantly improve the defrosting efficiency and ensure the defrosting effect. On the other hand, in the embodiment, the fan is controlled to rotate in a second direction during the defrosting of the evaporator, thereby realizing simultaneous defrosting and dehumidification, and further increasing the dehumidification efficiency of the dehumidifier under low-temperature operating conditions.

[0102] In some alternative embodiments of the present application, the defrosting of the evaporator comprises: controlling the refrigerant to circulate in a first direction, wherein the first direction is opposite to the circulating direction of the refrigerant during the dehumidification operation of the dehumidifier.

[0103] In some alternative embodiments of the present application, the defrosting of the evaporator comprises: controlling the fan to rotate in a second direction, wherein the second direction is opposite to the rotating direction of the fan during the dehumidification operation of the dehumidifier.

[0104] In some alternative embodiments of the present application, the defrosting of the evaporator comprises: defrosting by controlling the compressor to stop and the fan to continue to operate. That is, after the compressor stops, the fan forced convection is used to melt the frost layer on the surface of the evaporator.

[0105] In some alternative embodiments of the present application, the defrosting of the evaporator further comprises:

[0106] Before the refrigerant is controlled to circulate in the first direction and / or the fan is controlled to rotate in the second direction, the first operating frequency of the compressor and the fourth temperature of the evaporator are obtained.

[0107] The compressor is controlled to operate at a preset frequency when the refrigerant is controlled to circulate in the first direction and the fan is controlled to rotate in the second direction, and the preset frequency is inversely related to the fourth temperature of the evaporator.

[0108] Specifically, the fourth temperature of the evaporator refers to the temperature of the evaporator.

[0109] In this embodiment, when the refrigerant circulates in the first direction (i.e., in reverse), the preset frequency of the compressor is determined by the fourth temperature of the evaporator before defrosting is performed. The lower the fourth temperature, the higher the preset frequency of the compressor when circulating in reverse. Through the above setting, a higher compressor discharge temperature can be obtained to speed up the defrosting speed of the refrigerant.

[0110] For example, the correspondence between the preset frequency of the compressor and the fourth temperature of the evaporator can be as shown in Table 4, where the second preset frequency > the first preset frequency > the first frequency of the compressor when the refrigerant circulates in the forward direction.

[0111] Table 4

[0112] Fourth temperature of evaporator (-5，0℃) ≤-5℃ Compressor operating frequency First preset frequency Second preset frequency

[0113] Further, in some optional embodiments of the present application, the defrosting of the evaporator further includes:

[0114] Before the refrigerant is controlled to circulate in the first direction and / or the fan is controlled to rotate in the second direction, a second dry-bulb temperature of the operating environment is obtained;

[0115] After the compressor is controlled to operate at the preset frequency, the following steps are further included:

[0116] A third temperature of the evaporator is obtained;

[0117] It is determined whether the third temperature is greater than or equal to a third preset temperature, and the third preset temperature is positively related to the second dry-bulb temperature;

[0118] If yes, after a third preset time, the dehumidifier is controlled to perform dehumidifying operation, and the compressor operates at a first operating frequency.

[0119] Specifically, the third temperature of the evaporator refers to the temperature of the evaporator.

[0120] In this embodiment, the third preset temperature is positively related to the second dry-bulb temperature, specifically, the third preset temperature increases as the operating environment temperature monitoring value increases, and the correspondence therebetween can be referred to Table 5. This control strategy can avoid the negative influence of the residual heat in the evaporator after defrosting on the refrigerant forward circulation dehumidifying at different operating temperature conditions.

[0121] Table 5

[0122] Second dry-bulb temperature ≤5℃ (5，10℃] ＞10℃ Third preset temperature 3℃ 5℃ 7℃

[0123] Because the evaporator coil's temperature may rise faster than the frost layer melts when the high-temperature refrigerant dissipates heat from the inside out to defrost the evaporator coil, to ensure complete frost melting, the refrigerant continues to circulate in reverse until a third preset time has passed when the third temperature (e.g., the pipe temperature monitoring value) reaches a third preset temperature. The defrost operation then stops after the third preset time has elapsed. The third preset time is 30-90 seconds (e.g., 30s, 40s, 50s, 60s, 70s, 80s, or 90s).

[0124] In some alternative embodiments, defrosting the evaporator further comprises:

[0125] determining whether the third temperature is greater than or equal to a third preset temperature;

[0126] If so, after a third preset time, the dehumidifier is controlled to perform a dehumidification operation, and the compressor is operated at a second operating frequency.

[0127] Specifically, the second operating frequency is equal to the first operating frequency; or, the second operating frequency is greater than the first operating frequency; or, the second operating frequency is less than the first operating frequency.

[0128] In some preferred embodiments of the present invention, the control method mainly includes the following steps:

[0129] Step S31, dehumidification operation under medium and low temperature conditions;

[0130] Step S32, determining the frosting condition;

[0131] Step S33: If the conditions in S32 are met, perform defrosting and synchronize normal dehumidification;

[0132] Step S34, determining the defrost exit condition;

[0133] Step S35: If the conditions in S34 are met, the defrosting operation is terminated and the original dehumidification operation is restored.

[0134] like Figure 3 As shown, specifically, the control method of the dehumidifier includes:

[0135] When the dehumidifier is operating under medium-low temperature conditions, determining whether the second temperature of the evaporator is less than a second preset temperature (in this embodiment, 0° C.);

[0136] If so, obtaining a first dry-bulb temperature and a first relative humidity of the operating environment;

[0137] Start timing actual frost accumulation time (denoted as T 结霜 ) and running time (denoted as T 运行 );

[0138] Determine whether the actual frost accumulation time is greater than or equal to a second preset time;

[0139] If yes, determine whether the ratio of the actual frost accumulation time to the running time is greater than or equal to a preset ratio;

[0140] If yes, obtain a first running frequency of the compressor and a second dry-bulb temperature of the running environment;

[0141] Control the refrigerant to circulate in a first direction (i.e., control the refrigerant to circulate in a reverse direction), control the fan to rotate in a second direction (i.e., control the fan to rotate in a reverse direction), and control the compressor to run at a preset frequency;

[0142] Determine whether the third temperature is greater than or equal to a third preset temperature;

[0143] If yes, after a third preset time, control the refrigerant to circulate in a third direction (i.e., control the refrigerant to circulate in a forward direction), control the fan to rotate in a fourth direction (i.e., control the fan to rotate in a forward direction), and control the compressor to run at the first running frequency.

[0144] In the embodiment, the control method of the dehumidifier further includes: when the dehumidifier is dehumidifyingly running in a medium-low temperature working condition, determining whether a second temperature of the evaporator is less than a second preset temperature (in the embodiment, 0℃); if not, the dehumidifier continues dehumidifyingly running.

[0145] As shown in Figures 4-7 , the present application provides a dehumidifier, which comprises a control device, the control device comprises a memory and a processor, the memory stores a control program, and the control program is executed by the processor to realize the control method of the dehumidifier in any of the above embodiments.

[0146] In some optional embodiments of the present application, the dehumidifier further comprises a compressor 1, an evaporator 3, a condenser 2, a fan 5, and a refrigerant flow control device 6.

[0147] Specifically, the evaporator 3 and the condenser 2 are arranged side by side, and the fan 5 is arranged on the side of the condenser 2 away from the evaporator 3. The refrigerant flow control device is configured to: control the refrigerant to circulate in a third direction (i.e., control the refrigerant to circulate in a forward direction) when the dehumidifier is dehumidifyingly running; and control the refrigerant to circulate in a first direction (i.e., control the refrigerant to circulate in a reverse direction) when the dehumidifier is defrostingly running.

[0148] In some optional embodiments of the present invention, the fan 5 is a reversible axial flow fan. The fan is configured to: when the dehumidifier is in dehumidification operation, the fan 5 is controlled to rotate in the fourth direction (i.e., the fan is controlled to rotate in the forward direction); when the dehumidifier is in defrosting operation, the fan 5 is controlled to rotate in the second direction (i.e., the fan is controlled to rotate in the reverse direction).

[0149] like Figure 4 As shown, in some optional embodiments of the present invention, the refrigerant flow control device 6 includes two three-way solenoid valves. Specifically, the three-way solenoid valve is a two-position three-way solenoid valve. In some alternative embodiments of the present invention, as Figure 5 As shown, the refrigerant flow control device 6 includes four two-way solenoid valves; or, the refrigerant flow control device includes multiple different types of valves.

[0150] Specifically, the two three-way solenoid valves are a first three-way solenoid valve and a second three-way solenoid valve. The three openings of the first three-way solenoid valve are respectively connected to the inlet of the condenser 2, the outlet of the evaporator 3, and the outlet of the compressor 1. The three openings of the second three-way solenoid valve are respectively connected to the inlet of the condenser 2, the outlet of the evaporator 3, and the inlet of the compressor 1.

[0151] During dehumidification operation, the switch status of the refrigerant flow control device is as follows: Figure 6 As shown, black indicates an open valve at this location, and white indicates a closed valve at this location. When the dehumidifier is operating, the refrigerant is discharged from compressor 1 and passes through the dehumidifier's condenser 2, throttling device 4, and evaporator 3 in sequence before returning to compressor 1. In this state, the reversible axial flow fan operates in the forward direction, with the air flowing through evaporator 3 before condenser 2. Frost forms on the low-temperature surface of evaporator 3.

[0152] During defrosting operation, the switch status of the refrigerant flow control device is as follows: Figure 7 As shown, black indicates an open valve at this location in the pipeline, and white indicates a closed valve at this location. During defrosting operation, the refrigerant discharged from compressor 1 passes through the dehumidifier's evaporator 3, throttling device 4, and condenser 2 in sequence before returning to compressor 1. In this state, the reversible axial flow fan operates in reverse, with air flowing through condenser 2 before evaporator 3. The high-temperature refrigerant condenses and dissipates heat in evaporator 3 (which now acts as a condenser), rapidly defrosting the air. After throttling, it evaporates in condenser 2 (which now acts as an evaporator), absorbing heat while cooling and dehumidifying. This achieves complete defrosting while ensuring the normal operation of the dehumidification function.

[0153] After it is determined that defrosting is completed, the refrigerant flow control device switches back to the dehumidification operation state, and the reversible axial flow fan runs in the forward direction.

[0154] In the embodiment, firstly, the refrigerant temperature discharged by the compressor is obviously higher than the ambient temperature, and the high efficient and fast defrosting can be realized by directly passing the refrigerant into the evaporator; secondly, by switching the switch state of the refrigerant flow control device and the operation direction of the axial flow fan, the dehumidification function can be ensured to be realized normally when the dehumidifier is in the defrosting operation; finally, the defrosting determination condition is closely related to the thickness of the frost layer, the determination accuracy of the defrosting control method is improved, the proportion of the defrosting cycle is reasonably optimized, and the dehumidification efficiency under the low temperature working condition of the dehumidifier is increased.

[0155] In some optional embodiments of the present application, the compressor is a variable frequency compressor with adjustable operation frequency.

[0156] At this point, those skilled in the art should recognize that, although the present application has been shown and described in detail in this paper, many other variants or modifications conforming to the principles of the present application can be directly determined or deduced according to the disclosed content 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, characterized by, The method comprises: acquiring a second temperature of the evaporator; acquiring a first temperature of the evaporator; determining an actual frost accumulation time according to whether the first temperature is less than a first preset temperature; judging whether the evaporator meets a first defrosting condition according to the actual frost accumulation time; acquiring a running time length of dehumidification; judging whether the evaporator meets a second defrosting condition according to the running time length and the first defrosting condition; wherein the acquiring of the first temperature of the evaporator and the determining of the actual frost accumulation time according to whether the first temperature is less than the first preset temperature comprises: when the second temperature of the evaporator is less than a second preset temperature, starting timing, acquiring the first temperature of the evaporator every first preset time, and judging whether the first temperature is less than the first preset temperature, and if yes, increasing the actual frost accumulation time by the first preset time; the judging of whether the evaporator meets the first defrosting condition according to the actual frost accumulation time comprises: when the actual frost accumulation time is greater than or equal to a second preset time, the evaporator meets the first defrosting condition; the acquiring of the running time length of dehumidification comprises: when the second temperature of the evaporator is less than the second preset temperature, starting timing, acquiring the first temperature of the evaporator every first preset time, and increasing the running time length by the first preset time; the judging of whether the evaporator meets the second defrosting condition according to the running time length and the first defrosting condition comprises: when the evaporator meets the first defrosting condition, judging whether a ratio of the actual frost accumulation time to the running time length is greater than or equal to a preset ratio, and if yes, judging that the evaporator meets the second defrosting condition.

2. The control method of the dehumidifier according to claim 1, wherein after judging whether the ratio of the actual frost accumulation time to the running time length is greater than or equal to the preset ratio, the method further comprises: if the ratio of the actual frost accumulation time to the running time length is less than the preset ratio, correcting the running time length and the actual frost accumulation time, and continuing to acquire the first temperature of the evaporator and the running time length until the evaporator meets the first defrosting condition and the second defrosting condition. The control method further comprises:

3. The control method of a dehumidifier according to claim 1, characterized by, when the second temperature of the evaporator is less than the second preset temperature, acquiring a first dry-bulb temperature and a first relative humidity of a running environment; assigning a value to the second preset time according to the first dry-bulb temperature and the first relative humidity; the first dry-bulb temperature is inversely related to the second preset time, and the first relative humidity is positively related to the second preset time.

4. The control method of the dehumidifier according to any one of claims 1-3, wherein after the evaporator meets the first defrosting condition, or after the evaporator meets the second defrosting condition, defrosting the evaporator; the defrosting of the evaporator comprises: ​ ​ The control device controls the refrigerant to circulate in a first direction opposite to a direction of the refrigerant circulation during the dehumidifying operation of the dehumidifier and / or controls the fan to rotate in a second direction opposite to a direction of the fan rotation during the dehumidifying operation of the dehumidifier. 5.The control method of the dehumidifier according to claim 4, wherein the defrosting of the evaporator further comprises: The control device controls the refrigerant to circulate in a first direction opposite to a direction of the refrigerant circulation during the dehumidifying operation of the dehumidifier and / or controls the fan to rotate in a second direction opposite to a direction of the fan rotation during the dehumidifying operation of the dehumidifier. 6.The control method of the dehumidifier according to claim 5, wherein the defrosting of the evaporator further comprises: The control device controls the refrigerant to circulate in a first direction opposite to a direction of the refrigerant circulation during the dehumidifying operation of the dehumidifier and / or controls the fan to rotate in a second direction opposite to a direction of the fan rotation during the dehumidifying operation of the dehumidifier. The control device controls the refrigerant to circulate in a first direction opposite to a direction of the refrigerant circulation during the dehumidifying operation of the dehumidifier and / or controls the fan to rotate in a second direction opposite to a direction of the fan rotation during the dehumidifying operation of the dehumidifier. The control device controls the refrigerant to circulate in a first direction opposite to a direction of the refrigerant circulation during the dehumidifying operation of the dehumidifier and / or controls the fan to rotate in a second direction opposite to a direction of the fan rotation during the dehumidifying operation of the dehumidifier. The control device controls the refrigerant to circulate in a first direction opposite to a direction of the refrigerant circulation during the dehumidifying operation of the dehumidifier and / or controls the fan to rotate in a second direction opposite to a direction of the fan rotation during the dehumidifying operation of the dehumidifier. ​ ​ ​ ​ 7. A dehumidifier, characterized by ​

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