CN108361951B

CN108361951B - Method for preventing condensation by self-cleaning and air conditioner

Info

Publication number: CN108361951B
Application number: CN201810095879.0A
Authority: CN
Inventors: 许文明
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Haier Smart Home Co Ltd
Priority date: 2018-01-31
Filing date: 2018-01-31
Publication date: 2020-11-27
Anticipated expiration: 2038-01-31
Also published as: CN108361951A

Abstract

The invention discloses a method for preventing condensation by self-cleaning, belonging to the technical field of air conditioner control. The method comprises the following steps: obtaining indoor humidity and judging whether condensation preventing operation is needed or not, and if so, performing condensation preventing operation; obtaining the indoor humidity again after the air conditioner runs for a set time and judging whether condensation prevention operation is needed or not; if still needed, the air conditioner is controlled to perform a self-cleaning operation to prevent dew condensation. According to the embodiment of the invention, not only can condensation be effectively prevented, but also the refrigeration effect of the air conditioner is not influenced, and the air conditioner can be self-cleaned, so that multiple purposes can be achieved, and the use experience of a user is greatly improved. The invention also discloses an air conditioner.

Description

Method for preventing condensation by self-cleaning and air conditioner

Technical Field

The invention relates to the technical field of air conditioner control, in particular to a method for preventing condensation by self-cleaning and an air conditioner.

Background

The existing household air conditioner has the advantages that in the process of refrigerating operation, when the humidity of an indoor environment is large, namely when the temperature of an indoor coil pipe is lower than the current dew point temperature, condensation can be generated, certain condensation is a normal phenomenon, but when the condensation amount is too large or the structure or heat exchanger shunting design is unreasonable, excessive condensation water can be blown out or flow downwards along an air conditioner outer panel, and the inconvenience in use of a user is caused. In general, the problem of improving condensation is solved by optimizing hardware of an air conditioner, optimizing flow distribution or pasting heat insulation cotton on the inner side of a panel of the air conditioner, but the method cannot solve all working conditions of the air conditioner after leaving a factory, and if similar problems are found after leaving the factory, the structure cannot be changed, but the problem can be solved in an optimized manner in control. In some existing anti-condensation control methods, the anti-condensation effect is achieved by increasing an electric heating device and turning on the electric heating device to heat under certain conditions, or the anti-condensation effect is achieved by reducing the operating frequency of a compressor and reducing the refrigeration raising temperature. These methods try to avoid condensation by raising the temperature above the dew point. Although the method can prevent the occurrence of condensation, the temperature is required to be raised, so that the effect of air conditioning refrigeration is influenced.

Disclosure of Invention

Embodiments of the present invention are directed to a novel method of preventing condensation, and the following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

According to a first aspect of embodiments of the present invention, there is provided a method for preventing condensation by self-cleaning, comprising: obtaining indoor humidity and judging whether condensation preventing operation is needed or not, and if so, performing condensation preventing operation; obtaining the indoor humidity again after the air conditioner runs for a set time and judging whether condensation prevention operation is needed or not; if still needed, the air conditioner is controlled to perform a self-cleaning operation to prevent dew condensation.

Optionally, the performing the anti-condensation operation includes reducing an operating frequency of the air conditioner compressor, or reducing an opening degree of the throttling part, or reducing the operating frequency of the air conditioner compressor and reducing the opening degree of the throttling part.

Optionally, the controlling the air conditioner to perform the self-cleaning operation includes: the running frequency of the compressor is increased or kept, and the rotating speed of the indoor fan is reduced or the indoor fan is turned off, so that the surface of the indoor heat exchanger of the air conditioner is frosted.

Optionally, during the process of frosting the surface of the indoor heat exchanger of the air conditioner, the method further comprises: obtaining indoor humidity and judging whether condensation prevention operation is needed or not; and if necessary, increasing the operating frequency of the air conditioner compressor, or prolonging the frosting time, or increasing the operating frequency of the air conditioner compressor and prolonging the frosting time.

Optionally, the controlling the air conditioner to perform the self-cleaning operation further includes: after the surface of the indoor heat exchanger of the air conditioner is frosted, the air conditioner is switched to a heating mode, so that the surface of the indoor heat exchanger of the air conditioner is frosted into water.

Optionally, the operating frequency of the air conditioning compressor is reduced proportionally.

Optionally, the ratio is a fixed ratio. The value range of the fixed proportion is between 60% and 90%. Optionally, the fixed ratio is 60%, 65%, 70%, 75%, 80%, 85% or 90%.

Optionally, the ratio is a variable ratio. Optionally, the value of the variable ratio depends on the difference Δ RH between the indoor humidity and the set threshold RHt. Wherein Δ RH = RH-RHt, RH being indoor humidity.

Optionally, the larger the difference Δ RH between the indoor humidity and the set threshold is, the larger the value of the variable ratio is. Optionally, the variable ratio is proportional to the difference Δ RH between the indoor humidity and the set threshold. Optionally, the variable ratio R = c Δ RH, c being a weighted value. Wherein the value range of c is between 1 and 4. Optionally, c =1, 2, 3 or 4.

Optionally, the variable ratio R = Δ RH + b, b is a correction value. Wherein the value range of b is between 0.1 and 0.4. Alternatively, b =0.1, 0.2, 0.3, or 0.4.

Optionally, the conditions for judging whether the anti-condensation operation needs to be performed are the same or different.

Alternatively, the conditions required for the anti-condensation operation are: the indoor humidity RH is greater than the set threshold RHT, or the time that the indoor humidity RH is continuously greater than the set threshold RHT reaches the set duration.

Wherein, the value range of the set threshold RHT is between 60% and 90%. Optionally, the set threshold RHt is 60%, 65%, 70%, 75%, 80%, 85% or 90%.

Optionally, after controlling the air conditioner to perform the self-cleaning operation, the method further includes: and controlling the air conditioner to carry out self-cleaning operation again or for multiple times until the indoor humidity RH is less than or equal to the set threshold RHT.

Optionally, the indoor humidity is obtained by sensor detection or by algorithmic calculation.

According to a second aspect of embodiments of the present invention, there is provided an air conditioner including a microcontroller, the microcontroller including: a data unit for obtaining an indoor humidity; the judging unit is used for judging whether condensation preventing operation is needed or not according to the indoor humidity; and the control unit is used for performing condensation prevention operation or controlling the air conditioner to perform self-cleaning operation when condensation prevention operation is required.

Optionally, controlling the air conditioner to perform a self-cleaning operation, comprising: the running frequency of the compressor is increased or kept, and the rotating speed of the indoor fan is reduced or the indoor fan is turned off, so that the surface of the indoor heat exchanger of the air conditioner is frosted; and switching the air conditioner to a heating mode to defrost the surface of the indoor heat exchanger of the air conditioner into water.

Optionally, the control unit is further configured to switch the air conditioner back to the cooling mode after the surface of the indoor heat exchanger of the air conditioner is defrosted.

Optionally, the control unit is further configured to start the data unit and the determination unit in a process of frosting the surface of the indoor heat exchanger of the air conditioner, and increase the operation frequency of the air conditioner compressor, or prolong the frosting time, or increase the operation frequency of the air conditioner compressor and prolong the frosting time when the anti-condensation operation is required.

Alternatively, the conditions for judging whether the anti-condensation operation needs to be performed are the same or different for a plurality of times.

Optionally, the control unit controls the air conditioner to perform multiple self-cleaning operations until the indoor humidity RH is less than or equal to the set threshold RHt.

Optionally, the air conditioner further comprises a humidity sensor for detecting indoor humidity, and the humidity sensor sends detected data to the data unit.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

in the embodiment of the invention, the condensation is prevented by raising the temperature of the outlet air, the humidity is still high after the condensation preventing operation is executed for a period of time, the surface temperature of the indoor heat exchanger is controlled to be lower than the dew point temperature by a self-cleaning mode which is completely opposite to the condensation preventing operation to the air conditioning process, so that a large amount of moisture in the air is condensed, a frost or ice layer is formed on the surface of the heat exchanger, and the condensation preventing effect is obtained. According to the embodiment of the invention, not only can condensation be effectively prevented, but also the refrigeration effect of the air conditioner is not influenced, and the air conditioner can be self-cleaned, so that multiple purposes can be achieved, and the use experience of a user is greatly improved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a schematic flow diagram illustrating a method for condensation prevention using self-cleaning, according to an exemplary embodiment;

FIG. 2 is a schematic flow diagram illustrating a method for condensation prevention using self-cleaning, according to an exemplary embodiment;

FIG. 3 is a flow diagram illustrating a method for condensation prevention using self-cleaning in accordance with an exemplary embodiment;

FIG. 4 is a flow diagram illustrating a method for condensation prevention using self-cleaning in accordance with an exemplary embodiment;

FIG. 5 is a flow diagram illustrating a self-cleaning operation according to an exemplary embodiment;

FIG. 6 is a schematic flow diagram illustrating a method for increasing the amount of frost according to an exemplary embodiment;

FIG. 7 is a schematic flow diagram illustrating a method for improving outlet air temperature in accordance with an exemplary embodiment;

fig. 8 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment;

fig. 9 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment;

fig. 10 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment;

fig. 11 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment;

fig. 12 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment;

fig. 13 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment.

Detailed Description

The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some alternative embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the structures, products and the like disclosed by the embodiments, the description is relatively simple because the structures, the products and the like correspond to the parts disclosed by the embodiments, and the relevant parts can be just described by referring to the method part.

When the indoor unit of the air conditioner operates in a cooling or heating mode, air in the indoor environment enters the indoor unit along the air inlet of the indoor unit and is blown into the indoor environment again through the air outlet after heat exchange of the heat exchange plates, in the process, impurities such as dust, large particles and the like mixed in the indoor air can also enter the indoor machine along with the air flow of the inlet air, although the dustproof filter screen arranged at the air inlet of the indoor unit can filter most of dust and particles, but a small amount of fine dust is not completely blocked and filtered, and with the long-term use of the air conditioner, the dust will gradually deposit and adhere to the surfaces of the heat exchanger fins, and since the dust covering the outer surfaces of the heat exchanger is less thermally conductive, it directly affects the heat exchange between the heat exchange fins and the indoor air, so that the indoor unit needs to be cleaned regularly to ensure the heat exchange efficiency of the indoor unit. The untimely nature of manual cleaning is avoided, and the prior art discloses that an air conditioner indoor unit comprises a self-cleaning mode to realize the timely cleaning of the air conditioner.

The self-cleaning mode mainly comprises a frost condensation stage and a defrosting stage, wherein in the frost condensation stage, the air conditioner operates in a refrigeration mode, the operating frequency of an air conditioner compressor is improved, and the refrigerant output quantity of the indoor heat exchanger is increased, so that moisture in indoor air can be gradually condensed into a frost layer or an ice layer on the outer surface of the heat exchanger, and in the process, the condensed frost layer can be combined with dust, so that the dust is peeled off from the outer surface of the heat exchanger; then, in the defrosting stage, the air conditioner operates in a heating mode, the temperature of the outer surface of the heat exchanger is increased, the frost layer condensed on the outer surface of the heat exchanger is melted, and dust is collected into the water receiving disc along with melted water flow, so that the purpose of self-cleaning the air conditioner can be achieved.

FIG. 1 is a flow diagram illustrating a method for preventing condensation using self-cleaning, according to an exemplary embodiment. As shown in fig. 1, the method includes:

step S101: and obtaining the indoor humidity and judging whether the anti-condensation operation is required.

Step S102: and if the condensation preventing operation is required, controlling the air conditioner to perform a self-cleaning operation to prevent condensation.

In the present embodiment, a determination condition is preset in the air conditioning system as to whether to perform the anti-condensation operation, and the determination condition may be the same or different in different air conditioning systems. In some optional embodiments, the judgment condition is unique in different working stages of the air conditioner in the same air conditioning system, and in some optional embodiments, different judgment conditions are set for whether to execute the anti-condensation operation or not in different working stages of the air conditioner in the same air conditioning system.

In this embodiment, there are multiple ways to obtain the indoor humidity, and optionally, the indoor humidity is measured by a humidity sensor of the air conditioning system, or the indoor humidity detected by other devices is obtained in a networking manner, or the indoor temperature is obtained by other data calculation.

In the present embodiment, whether the anti-condensation operation is required is determined by the obtained indoor humidity and the preset judgment condition of the air conditioning system.

In some optional embodiments, the determination condition of whether the anti-condensation operation is required is that the indoor humidity RH is greater than the set threshold RHt.

When the obtained indoor temperature satisfies the condition, that is, the indoor humidity is high, there is a risk of generating condensation, and thus it is determined that the condensation prevention operation is required. Wherein, the value range of the set threshold RHT is between 60% and 90%. Optionally, the set threshold RHt is 60%, 65%, 70%, 75%, 80%, 85% or 90%. The value of the set threshold is related to the set target temperature of the air conditioner, and the lower the set target temperature is, the smaller the value of the set threshold is, for example: the threshold RHt is set to 65% when the target set temperature is 20 ℃ and to 80% when the target set temperature is 27 ℃. When the set target temperature is lower, the outlet air temperature is lower, therefore, under the same humidity condition, condensation is more easily generated when the set target temperature is lower, condensation prevention operation needs to be performed in advance, and the lower the set target temperature is, the smaller the value of the set threshold is.

In some optional embodiments, the determination condition of whether the anti-condensation operation is required is that the indoor humidity RH continues to be greater than the set threshold RHt for the set time period.

At this time, when the obtained indoor temperature satisfies the condition that the humidity in the indoor is high for a relatively short time, there is a risk of generating condensation, and thus it is determined that the condensation preventing operation is required. The value of the set time is related to the set target temperature, when the indoor humidity RH is constant, the lower the set target temperature is, the lower the outlet air temperature is, condensation is likely to be generated, and therefore condensation prevention operation needs to be performed in advance, and the smaller the value of the set time is.

In step 102, when the judgment result indicates that the anti-condensation operation is required, the air conditioner is controlled to perform self-cleaning operation to prevent condensation, water in the air is condensed into a frost layer or an ice layer through a frost condensation stage in a self-cleaning mode and is attached to the outer surface of the heat exchanger, the humidity of the indoor air is reduced, the condensation is avoided, the frost layer condensed on the outer surface of the heat exchanger is melted into water through a frost melting stage, the water is collected to a water receiving tray to be discharged, potential safety hazards caused when the frost layer drops onto other air conditioner components are avoided, and the service life of the air conditioner components is shortened. The self-cleaning operation realizes condensation prevention and self cleaning of the air conditioner.

The embodiment provides a technical idea which is completely opposite to other existing anti-condensation technologies, when the anti-condensation condition is met, the self-cleaning mode of the air conditioner is started, the surface temperature of the indoor heat exchanger is controlled to be lower than the dew point temperature through the self-cleaning mode, a large amount of moisture in the air is condensed, a frost or ice layer is formed on the surface of the heat exchanger, and the anti-condensation effect is achieved. This embodiment can not only effectively prevent the emergence of condensation, can not influence the refrigerated effect of air conditioner moreover, can also carry out the automatically cleaning of air conditioner, can be worried one's things more, has greatly promoted user's use and has experienced.

FIG. 2 is a flow diagram illustrating a method for anti-condensation using self-cleaning, according to an exemplary embodiment. As shown in fig. 2, the method includes:

step S201: and obtaining indoor humidity and temperature information and judging whether condensation prevention operation is needed or not according to a first preset condition.

Step S202: and if the condensation preventing operation is required, controlling the air conditioner to perform a self-cleaning operation to prevent condensation.

In the present embodiment, unlike the previous embodiments, in step S201, the air conditioning system determines whether an operation for preventing condensation is required by using the obtained indoor humidity and temperature information and the preset determination condition of the air conditioning system.

In controlling an air conditioner, commonly used temperature parameters include: indoor temperature, outdoor temperature, indoor coil temperature, outdoor coil temperature, indoor unit air inlet temperature, indoor unit air outlet temperature, compressor suction port temperature, compressor discharge port temperature, and the like.

In different embodiments, the air conditioning system can judge whether the anti-condensation operation is needed or not by acquiring specific data of one or more temperature parameters and integrating the indoor humidity.

In this embodiment, there are multiple ways to obtain temperature data, and optionally, the temperature data is obtained by measuring with a temperature sensor provided in the air conditioning system, or obtaining temperature data detected by other devices through networking, or obtaining a certain temperature data through other data calculation.

In this embodiment, synthesize multiple parameter and judge whether need prevent the condensation operation, compromise the other operational aspect outside the condensation operation of preventing of air conditioner for control process is more accurate, and the running state of air conditioner more accords with user's demand, has avoided that temperature fluctuation is big in the operation process, brings the discomfort to the human body.

In some optional embodiments, in step S201, the temperature information includes an indoor ambient temperature; the first preset condition includes: if the indoor humidity is greater than the set threshold RHt and the temperature difference Δ t1 between the indoor ambient temperature Troom and the target temperature Tset is less than or equal to the first set temperature difference, the anti-condensation operation is required.

When the first preset condition is met and the indoor humidity is high, condensation is easy to generate, so related operation of condensation prevention is required to be performed, meanwhile, the temperature difference delta t1 between the indoor environment temperature Troom and the target temperature Tset is smaller than or equal to the first set temperature difference, the indoor temperature basically meets the user requirement, the related operation of condensation prevention can be considered to be performed preferentially at the moment, and the step S202 is executed to control the air conditioner to perform self-cleaning operation so as to prevent condensation.

In some optional embodiments, in step S201, the temperature information includes an indoor coil temperature; the first preset condition includes: if the indoor humidity is greater than the set threshold RHT and the temperature difference Δ T2 between the indoor coil temperature Tcoi1 and the dew point temperature T1 is less than or equal to a second set temperature difference, then an anti-condensation operation is required.

When the first preset condition is met and the indoor humidity is high, condensation is easy to generate, the temperature difference delta T2 between the indoor coil temperature Tcoi1 and the dew point temperature T1 is smaller than or equal to a second set temperature difference, the coil temperature is lower than the dew point temperature, the difference between the coil temperature and the dew point temperature is high, the condensation speed is high, condensation is to be prevented quickly, and the step S202 is executed to control the air conditioner to perform self-cleaning operation so as to prevent condensation.

In step S202, the air conditioner is controlled to perform self-cleaning operation to prevent condensation, water in the air is condensed into frost or ice layer through the frost condensation stage of the self-cleaning mode and attached to the outer surface of the heat exchanger, so as to reduce the humidity of the indoor air and avoid condensation, the condensed ice layer on the outer surface of the heat exchanger is melted into water through the frost melting stage, the water is collected to the water receiving tray and discharged, and potential safety hazards caused by the water dropping on other air conditioner components and parts are avoided and the service life of the air conditioner components and parts is shortened. The self-cleaning operation realizes condensation prevention and self cleaning of the air conditioner.

In the foregoing embodiment, the temperature of the surface of the indoor heat exchanger is controlled to be lower than the dew point temperature in the self-cleaning mode, so that a large amount of moisture in the air is condensed, a frost or ice layer is formed on the surface of the heat exchanger, and the frost or ice layer is melted through the frost condensation process, thereby achieving the effect of preventing condensation while achieving self-cleaning of the air conditioner.

In some alternative embodiments, as shown in fig. 3, a method for preventing condensation using self-cleaning includes:

step S301: and obtaining indoor humidity and judging whether condensation prevention operation is needed or not, and if so, performing condensation prevention operation.

Because when air-out frame mouth temperature was lower, more easily take place the condensation than under the less condition of indoor humidity under the great condition of indoor humidity, consequently when the condensation operation is prevented in the execution, with indoor humidity as the judgement basis of opening and preventing the condensation operation. The condensation preventing operation can be executed as early as possible by taking the indoor humidity as a judgment basis, and the phenomenon that condensation is not timely due to overhigh humidity is avoided.

It can be understood that when the anti-condensation operation is needed, the anti-condensation operation is performed, and when the anti-condensation operation is not needed, the current working state is maintained unchanged.

In step S301, as described in the foregoing embodiments, the determination method for determining whether the anti-condensation operation is required according to the indoor humidity is performed, and in some alternative embodiments, the determination condition is that the indoor humidity RH is greater than the set threshold RHt.

Wherein, the value range of the set threshold RHT is between 60% and 90%. Optionally, the set threshold RHt is 60%, 65%, 70%, 75%, 80%, 85% or 90%. The value of the set threshold is related to the set target temperature of the air conditioner, and the lower the set target temperature is, the smaller the value of the set threshold is.

In some alternative embodiments, the determination condition is that the indoor humidity RH continues to be greater than the set threshold RHt for a set time period.

The value of the set time length is related to the set target temperature, and the lower the set target temperature is, the smaller the value of the set time length is.

In step S301, the anti-condensation operation is performed in various forms: in some optional embodiments, the operating frequency of the air conditioner compressor is reduced, in other optional embodiments, the opening degree of the throttling component is reduced, and in other optional embodiments, the operating frequency of the air conditioner compressor is reduced and the opening degree of the throttling component is reduced.

The anti-condensation operation reduces the operating frequency of the air conditioner compressor or reduces the opening of the throttling component to reduce the output quantity of the refrigerant of the indoor heat exchanger, the outlet air temperature is increased to be higher than the dew point temperature, so that condensation is avoided as much as possible, the outlet air temperature is increased at a high speed, the operating frequency of the air conditioner compressor is reduced, and the opening of the throttling component is reduced.

Step S302: and after the air conditioner runs for a set time, obtaining the indoor humidity again and judging whether condensation prevention operation is needed or not.

Step S303: if still needed, the air conditioner is controlled to perform a self-cleaning operation to prevent dew condensation.

Because the anti-condensation operation realizes anti-condensation by increasing the air outlet temperature, the refrigeration requirement of the user can not be met by maintaining the anti-condensation operation for a long time. Therefore, after the air conditioner starts the condensation preventing operation and runs for the set time, the indoor humidity is acquired again to judge whether the condensation preventing operation is needed, at the moment, if the condensation preventing operation is still needed, the self-cleaning operation is started to reduce the indoor humidity, and the condensation is prevented from being generated by changing the environmental condition. And when the condensation prevention operation is not needed, maintaining the current working state unchanged.

In step S303, the air conditioner is controlled to perform self-cleaning operation to prevent condensation, water in the air is condensed into a frost or ice layer through a frost condensation stage in a self-cleaning mode and is attached to the outer surface of the heat exchanger, the humidity of the indoor air is reduced, condensation is avoided, the frost layer condensed on the outer surface of the heat exchanger is melted into water through a frost melting stage, the water is collected to the water receiving tray and is discharged, potential safety hazards caused when the water drops onto other air conditioner components are avoided, and the service life of the air conditioner components is shortened. The self-cleaning operation realizes condensation prevention and self cleaning of the air conditioner.

In this embodiment, in steps S301 and S302, whether the anti-condensation operation is required is determined according to the indoor humidity, in different steps, in some optional embodiments, whether the anti-condensation operation is required is determined according to the same determination condition according to the indoor humidity, and in some optional embodiments, whether the anti-condensation operation is required is determined according to the indoor humidity according to different determination conditions.

In the embodiment of the invention, the condensation is prevented by raising the temperature of the outlet air, the humidity is still high after the condensation preventing operation is executed for a period of time, the surface temperature of the indoor heat exchanger is controlled to be lower than the dew point temperature by a self-cleaning mode which is completely opposite to the condensation preventing operation to the air conditioning process, so that a large amount of moisture in the air is condensed, a frost or ice layer is formed on the surface of the heat exchanger, and the condensation preventing effect is obtained. This embodiment can not only effectively prevent the emergence of condensation, can not influence the refrigerated effect of air conditioner moreover, can also carry out the automatically cleaning of air conditioner, can be worried one's things more, has greatly promoted user's use and has experienced.

In some alternative embodiments, as shown in fig. 4, a method for preventing condensation using self-cleaning includes:

step S401: and obtaining the indoor humidity, judging whether condensation prevention operation is needed or not according to a second preset condition, and if so, performing condensation prevention operation.

In this embodiment, the indoor humidity is used as a criterion for determining whether to open the anti-condensation operation, and the second preset condition is determined by taking the indoor humidity as a parameter to determine when to open the anti-condensation operation, so as to implement the anti-condensation operation as early as possible, thereby avoiding the phenomenon of excessive humidity and untimely condensation prevention. And when the anti-condensation operation is not needed, maintaining the current working state unchanged.

In some optional embodiments, the second preset condition is that the indoor humidity RH is greater than the set threshold RHt, as described in the foregoing embodiment, in the determination manner of determining whether the anti-condensation operation needs to be performed according to the indoor humidity.

In some alternative embodiments, the second preset condition is that the indoor humidity RH continues to be greater than the set threshold RHt for a set duration.

Step S402: and after the air conditioner runs for a set time, obtaining indoor humidity and temperature information and judging whether condensation prevention operation is needed or not according to a first preset condition.

Step S403: if still needed, the air conditioner is controlled to perform a self-cleaning operation to prevent dew condensation.

In some optional embodiments, in step S402, the temperature information includes an indoor ambient temperature; the first preset condition includes: if the indoor humidity is greater than the set threshold RHt and the temperature difference Δ t1 between the indoor ambient temperature Troom and the target temperature Tset is less than or equal to the first set temperature difference, the anti-condensation operation is required.

When the first preset condition is met and the indoor humidity is high, condensation is easy to generate, so related operation of condensation prevention is needed, meanwhile, the temperature difference delta t1 between the indoor environment temperature Troom and the target temperature Tset is smaller than or equal to the first set temperature difference, the indoor temperature basically meets the user requirements, at this moment, the condensation prevention operation can be considered to be preferentially performed, and the step S403 is executed to control the air conditioner to perform self-cleaning operation so as to prevent condensation.

In some optional embodiments, in step S402, the temperature information includes an indoor coil temperature; the first preset condition includes: if the indoor humidity is greater than the set threshold RHT and the temperature difference Δ T2 between the indoor coil temperature Tcoi1 and the dew point temperature T1 is less than or equal to a second set temperature difference, then an anti-condensation operation is required.

When the first preset condition is met and the indoor humidity is high, condensation is easy to generate, the temperature difference delta T2 between the indoor coil temperature Tcoi1 and the dew point temperature T1 is smaller than or equal to a second set temperature difference, the coil temperature is lower than the dew point temperature, the difference between the coil temperature and the dew point temperature is high, the condensation speed is high, condensation is to be prevented quickly, and the step S403 is executed to control the air conditioner to perform self-cleaning operation to prevent condensation.

In step S403, the air conditioner is controlled to perform self-cleaning operation to prevent condensation, water in the air is condensed into frost or ice layer through the frost condensation stage of the self-cleaning mode and attached to the outer surface of the heat exchanger, so as to reduce the humidity of the indoor air and avoid condensation, the condensed ice layer on the outer surface of the heat exchanger is melted into water through the frost melting stage, the water is collected to the water receiving tray and discharged, and potential safety hazards caused by the water dropping on other air conditioner components and parts are avoided and the service life of the air conditioner components and parts is shortened. The self-cleaning operation realizes condensation prevention and self cleaning of the air conditioner.

In the foregoing embodiments, there are various implementations of the self-cleaning operation, and fig. 5 is a flowchart illustrating a self-cleaning operation according to an exemplary embodiment. As shown in fig. 5, the method includes:

step S501, the running frequency of the compressor is increased or kept, and the rotating speed of the indoor fan is reduced or the indoor fan is closed.

In this embodiment, step S501 is to implement a frost condensation stage of the self-cleaning mode, and in order to ensure that moisture in the indoor air in the frost condensation stage can be condensed into a frost or ice layer on the outer surface of the heat exchanger, the air conditioning system is preset with an operating frequency range of the compressor corresponding to the self-cleaning mode, where the limiting condition at least includes that the operating frequency of the compressor is greater than or equal to a set value, so as to ensure that the compressor operates at a higher frequency, the refrigerant output of the indoor heat exchanger is greater, and the outer surface of the heat exchanger is at least lower than the.

When the current operating frequency of the compressor meets the requirement of the self-cleaning mode on the operating frequency of the compressor, the operating frequency of the compressor is kept unchanged, and when the current operating frequency of the compressor is lower than the minimum value of the operating frequency of the compressor preset in the self-cleaning mode, the operating frequency of the compressor is increased. When the running frequency of the compressor is adjusted, the rotating speed of the indoor fan is reduced or the indoor fan is turned off, so that the speed of condensing moisture in indoor air into a frost or ice layer on the outer surface of the heat exchanger is increased, and condensation is avoided.

Step S502, after the surface of the indoor heat exchanger of the air conditioner is frosted, the air conditioner is switched to a heating mode.

In this embodiment, step S502 realizes the defrosting stage of the self-cleaning mode, and after the operation of the condensation process in the self-cleaning mode and the surface of the indoor heat exchanger of the air conditioner frosts, the defrosting stage needs to be executed to avoid the excessive surface frosting of the indoor heat exchanger of the air conditioner from affecting the heat exchange efficiency, and the air conditioner is switched to the heating mode at this time, so that the surface temperature of the indoor heat exchanger of the air conditioner rises to defrost the surface of the indoor heat exchanger of the air conditioner, and meanwhile, the dust deposited on the surface of the heat exchange plate is taken away along with the defrosting.

In some embodiments, according to an actual application scenario, the air conditioner needs to operate in a cooling mode, and operates in a heating mode in a defrosting stage, so that a defrosting process is not easy to last too long.

In the embodiment, in the air conditioner self-cleaning mode, the operating frequency of the compressor is increased or maintained, the rotating speed of the indoor fan is reduced or the indoor fan is turned off to control the surface temperature of the indoor heat exchanger to be lower than the dew point temperature, so that a large amount of moisture in the air is condensed, a frost or ice layer is formed on the surface of the heat exchanger, and then the air conditioner is switched to the heating mode to melt the frost or ice layer on the surface of the heat exchanger, so that the self-cleaning of the air conditioner is realized, and the air conditioner obtains a better condensation preventing effect.

In the foregoing implementations, the anti-condensation operation includes various forms, such as: and reducing the operating frequency of the air-conditioning compressor, or reducing the opening degree of the throttling component, or reducing the operating frequency of the air-conditioning compressor and reducing the opening degree of the throttling component.

If the anti-condensation operation is still needed after the self-cleaning operation is finished and the refrigeration mode is switched back, the operation frequency of the air conditioner compressor is reduced, or the opening degree of the throttling component is reduced, or the operation frequency of the air conditioner compressor is reduced and the opening degree of the throttling component is reduced, so that the output quantity of the refrigerant to the indoor heat exchanger is reduced, the outlet air temperature is increased to be higher than the dew point temperature, and condensation is avoided as much as possible.

The operation frequency of the air conditioner compressor is reduced in various modes, and in some alternative embodiments, the working frequency of the compressor is directly adjusted to a certain frequency value.

In some optional embodiments, the operation frequency of the air conditioner compressor is reduced proportionally, and the condition that the temperature fluctuation of the air conditioner is large due to the large change value of the operation frequency of the compressor, so that human discomfort is caused is avoided.

The value of the proportion is related to the temperature set by a user, when the temperature set by the user is lower, the lower the air outlet temperature is, the more easily condensation is generated in the air conditioner refrigeration process, and the working frequency of the compressor is required to be reduced as soon as possible, so that the lower the temperature set by the user is, the larger the value of the fixed proportion is.

Optionally, the larger the difference Δ RH between the indoor humidity and the set threshold is, the larger the value of the variable ratio is. Optionally, the variable ratio is proportional to the difference Δ RH between the indoor humidity and the set threshold.

Optionally, the variable ratio R = c Δ RH, c being a weighted value. Wherein the value range of c is between 1 and 4. Optionally, c =1, 2, 3 or 4. Optionally, the variable ratio R = Δ RH + b, b is a correction value. Wherein the value range of b is between 0.1 and 0.4. Alternatively, b =0.1, 0.2, 0.3, or 0.4.

When the Δ RH is larger, the indoor humidity is larger, condensation is easy to generate, and the air outlet temperature of the air conditioner is increased to be higher than the dew point temperature as soon as possible, so that the larger the Δ RH is, the larger the value of the variable ratio is, that is, the larger the value of c is, or the larger the value of b is.

On the basis of the foregoing embodiment, in order to improve the anti-condensation effect, it is necessary to increase the amount of frost in the frost forming stage of the self-cleaning mode in the above step S501, and as shown in fig. 6, a method for increasing the amount of frost is shown according to an embodiment, including:

in step S601, the indoor humidity is obtained.

Step S602, determining whether an anti-condensation operation is required, if so, performing the anti-condensation operation, and if not, performing step S603, otherwise, maintaining the current working state. In some optional embodiments, if the anti-condensation operation is not required, step S502 is executed to switch to the heating mode to enter the defrosting stage.

In step S602, as described in the foregoing embodiments, the determination method for determining whether the anti-condensation operation is required according to the indoor humidity is performed, in some optional embodiments, the indoor humidity RH is greater than the set threshold RHt.

Step S603, if necessary, increasing the operation frequency of the air conditioner compressor, or prolonging the frosting time, or increasing the operation frequency of the air conditioner compressor and prolonging the frosting time.

In the process of frosting the surface of the indoor heat exchanger of the air conditioner, if the indoor humidity is still larger, the frosting speed is increased, so that the operation frequency of the air conditioner compressor is increased to increase the output quantity of a refrigerant to the indoor heat exchanger, or the frosting time is prolonged, more moisture in the air is condensed on the surface of the indoor heat exchanger, the frosting quantity is increased, the humidity is reduced, or the operation frequency of the air conditioner compressor is increased and the frosting time is prolonged.

On the basis of the foregoing embodiment, as the defrosting stage of the self-cleaning mode in step S501 is operated, the temperature of the indoor heat exchanger is maintained to be lower than the dew point temperature, and the air outlet temperature of the air conditioner is low, which causes discomfort to the user, so that the air outlet temperature needs to be adjusted in the defrosting stage. Fig. 7 shows a method for improving outlet air temperature according to an embodiment, including:

step S701, starting the electric heating device after a first duration from a set time point.

In some optional embodiments, the set time point is a time when the air conditioner starts a self-cleaning operation. Wherein the first time period is shorter than the operation time period of the self-cleaning mode.

In some optional embodiments, the set time point is a time when the air conditioner completes the self-cleaning operation.

And step S702, turning off the electric heating device after the electric heating device runs for a second time.

According to actual demand, the air conditioner operation can make air conditioner air-out temperature rise under the refrigeration mode, opens electric heater unit, therefore the electric heating time should not be the overlength, and it is long to operate the second, closes electric heater unit promptly.

On the basis of the foregoing embodiments, after the self-cleaning operation is completed, in order to avoid the possibility of generating condensation due to the fact that the humidity in the room is still high after the self-cleaning operation is performed once, further condensation prevention is required, and there are many ways to further perform condensation prevention.

In some optional embodiments, to further prevent condensation, after the self-cleaning operation is completed, the method further includes:

obtaining indoor humidity, and judging whether condensation prevention operation is needed or not according to a second preset condition; if necessary, the anti-condensation operation is performed again.

Specifically, the second preset condition is that the indoor humidity RH is greater than the set threshold RHt, or the time that the indoor humidity RH is continuously greater than the set threshold RHt reaches the set duration as described in the foregoing embodiment.

The anti-condensation operation is to reduce the operation frequency of the air conditioner compressor or reduce the opening degree of the throttling part or reduce the operation frequency of the air conditioner compressor and reduce the opening degree of the throttling part as described in the foregoing embodiments.

In a specific embodiment, the second preset condition is any one of the second preset conditions, the condensation preventing operation is any one of the condensation preventing operation modes, and when the operation frequency of the air conditioner compressor is reduced, the adjustment is performed according to any one of the adjustment modes described in the previous embodiments.

In some optional embodiments, to further perform anti-condensation, after the self-cleaning operation is completed, the air conditioner is controlled to perform the self-cleaning operation again or multiple times until the indoor humidity RH is less than or equal to the set threshold value RHt.

In this embodiment, adjust the air-out temperature in automatically cleaning mode through opening electric heater unit, both guaranteed the operation of automatically cleaning mode and realized preventing the condensation, guarantee the comfort level of air-out temperature simultaneously, improve user experience.

The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods.

Fig. 8 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment. As shown in fig. 8, the air conditioner includes a microcontroller 101, and the microcontroller 101 includes: a data unit 801, a judgment unit 802 and a control unit 803.

In some alternative embodiments, the data unit 801 is used to derive the indoor humidity. The indoor humidity can be detected by a humidity sensor in the air conditioning system, or obtained from other humidity detection devices through networking, or calculated according to other data.

The determining unit 802 is configured to determine whether condensation prevention operation is required according to the indoor humidity. In some optional embodiments, the specific condition for determining whether the anti-condensation operation is required to be performed is as described in the foregoing method embodiments, and includes: the indoor humidity RH is greater than the set threshold RHT, or the time that the indoor humidity RH is continuously greater than the set threshold RHT reaches the set duration.

The control unit 803 is used to control the air conditioner to perform a self-cleaning operation when the determination unit 802 determines that the anti-condensation operation is required.

In this embodiment, when the anti-condensation condition is satisfied, the self-cleaning mode of the air conditioner is started, the surface temperature of the indoor heat exchanger is controlled to be lower than the dew point temperature through the self-cleaning mode, a large amount of moisture in the air is condensed, a frost or ice layer is formed on the surface of the heat exchanger, and the anti-condensation effect is achieved through the technical idea which is completely opposite to the existing other anti-condensation technologies. This embodiment can not only effectively prevent the emergence of condensation, can not influence the refrigerated effect of air conditioner moreover, can also carry out the automatically cleaning of air conditioner, can be worried one's things more, has greatly promoted user's use and has experienced.

In some optional embodiments, the control unit 803 controls the air conditioner to perform the anti-condensation operation when the determination unit 802 first determines that the anti-condensation operation is required, and controls the air conditioner to perform the self-cleaning operation when it is determined again that the anti-condensation operation is required after the control unit 803 controls the air conditioner to perform the anti-condensation operation.

Among them, the anti-condensation operation includes various forms, such as: and reducing the operating frequency of the air-conditioning compressor, or reducing the opening degree of the throttling component, or reducing the operating frequency of the air-conditioning compressor and reducing the opening degree of the throttling component. The control unit 803 specifically reduces the operating frequency of the air conditioning compressor in the manner described in the foregoing method embodiments.

In the foregoing embodiment, the determination unit 802 determines whether the conditions for performing the anti-condensation operation are the same or different a plurality of times.

In the foregoing embodiment, the control unit 803 is specifically configured to increase or maintain the operating frequency of the compressor, and decrease the rotation speed of the indoor fan or turn off the indoor fan to frost the surface of the indoor heat exchanger of the air conditioner during the self-cleaning operation of the air conditioner; and switching the air conditioner to a heating mode to defrost the surface of the indoor heat exchanger of the air conditioner into water.

In some optional embodiments, to avoid the air conditioner outlet air temperature rising due to long-time operation of the self-cleaning defrosting stage, the control unit 803 is further configured to switch the air conditioner back to the cooling mode after the surface of the indoor heat exchanger of the air conditioner is defrosted.

In some optional embodiments, in order to improve the anti-condensation effect, it is necessary to increase the amount of condensation in the condensation stage of the self-cleaning mode, and the control unit 803 is further specifically configured to start the data unit 801 and the determination unit 802 during the process of condensation on the surface of the indoor heat exchanger of the air conditioner, and to increase the operating frequency of the air conditioner compressor or prolong the time of condensation when the anti-condensation operation is required, or to increase the operating frequency of the air conditioner compressor and prolong the time of condensation.

In some optional embodiments, as shown in fig. 9, the air conditioner further includes a humidity sensor 102 for detecting the indoor humidity and sending the detected data to the data unit 801 for the determination unit 802 to determine whether condensation prevention is required.

Along with the operation of the frost condensation stage of the self-cleaning mode, the temperature of the indoor heat exchanger is kept to be lower than the dew point temperature, the air outlet temperature of the air conditioner is low, discomfort is brought to users, and therefore the air outlet temperature needs to be adjusted in the frost condensation stage. The control unit 803 is further configured to turn on the electric heating device after a first time period from a set time point, and turn off the electric heating device after the electric heating device operates for a second time period.

In some optional embodiments, the set time point is a time when the air conditioner starts a self-cleaning operation. Wherein the first time period is shorter than the operation time period of the self-cleaning mode. In some optional embodiments, the set time point is a time when the air conditioner completes the self-cleaning operation.

Fig. 10 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment. As shown in fig. 10, the air conditioner includes a microcontroller 103, and the microcontroller 103 includes: a first judgment unit 1001 and a control unit 1002.

The first determination unit 1001 is configured to obtain indoor humidity and temperature information and determine whether an anti-condensation operation is required according to a first preset condition.

The first predetermined condition as described in the previous method embodiment includes a plurality of forms.

Specifically, in some optional embodiments, the temperature information includes an indoor ambient temperature; the first preset condition includes: if the indoor humidity is greater than the set threshold RHt and the temperature difference Δ t1 between the indoor ambient temperature Troom and the target temperature Tset is less than or equal to the first set temperature difference, the anti-condensation operation is required.

In some optional embodiments, the temperature information includes an indoor coil temperature; the first preset condition includes: if the indoor humidity is greater than the set threshold RHT and the temperature difference Δ T2 between the indoor coil temperature Tcoi1 and the dew point temperature T1 is less than or equal to a second set temperature difference, then an anti-condensation operation is required.

The control unit 1002 is configured to control the air conditioner to perform a self-cleaning operation when the first determination unit 1001 determines that the anti-condensation operation is required.

In the foregoing embodiment, the control unit 1002 is specifically configured to increase or maintain the operating frequency of the compressor, and reduce the rotation speed of the indoor fan or turn off the indoor fan to frost the surface of the indoor heat exchanger of the air conditioner during the self-cleaning operation of the air conditioner; and switching the air conditioner to a heating mode to defrost the surface of the indoor heat exchanger of the air conditioner into water.

In some optional embodiments, to avoid the air conditioner outlet air temperature rising due to long-time operation of the self-cleaning defrosting stage, the control unit 1002 is further configured to switch the air conditioner back to the cooling mode after the surface of the indoor heat exchanger of the air conditioner is defrosted.

In some alternative embodiments, to increase the anti-condensation effect, it is necessary to increase the amount of frost in the frost-condensation stage of the self-cleaning mode. The control unit 1002 is further specifically configured to start the second determining unit 1003 in a process of frosting a surface of the indoor heat exchanger of the air conditioner, and increase an operation frequency of the air conditioner compressor or prolong a frosting time when the anti-condensation operation is required, or increase the operation frequency of the air conditioner compressor and prolong the frosting time.

In some alternative embodiments, as shown in fig. 11, the microcontroller 103 further comprises a second determination unit 1003. The second determination unit 1003 is configured to obtain the indoor humidity after the control unit 1002 controls the air conditioner to perform the self-cleaning operation and determine whether the anti-condensation operation is required according to a second preset condition. The control unit 1002 is further configured to adjust the frequency of the air conditioner compressor when the second determination unit determines that the anti-condensation operation is required.

In some optional embodiments, the control unit 1002 is further configured to activate the second determination unit 1003 after the self-cleaning operation is completed and the cooling mode is switched back, and to decrease the operation frequency of the air conditioner compressor or decrease the opening degree of the throttling part or both when the anti-condensation operation is required. The control unit 1002 specifically reduces the operating frequency of the air conditioner compressor in the manner described in the foregoing method embodiments.

In the foregoing embodiment, as described in the foregoing method embodiment, the second preset condition includes: and if the indoor humidity RH is greater than the set threshold RHT or the time that the indoor humidity RH is continuously greater than the set threshold RHT reaches the set duration, the anti-condensation operation is required.

Along with the operation of the frost condensation stage of the self-cleaning mode, the temperature of the indoor heat exchanger is kept to be lower than the dew point temperature, the air outlet temperature of the air conditioner is low, discomfort is brought to users, and therefore the air outlet temperature needs to be adjusted in the frost condensation stage. The control unit 1002 is further configured to start the electric heating device after a first time period elapses from a set time point, and to turn off the electric heating device after the electric heating device operates for a second time period.

In some optional embodiments, as shown in fig. 11, the air conditioner further includes a humidity sensor 104 for detecting the indoor humidity and sending the detected data to the first judging unit 1001 and the second judging unit 1003, so that the judging units judge whether condensation prevention is required according to different judging conditions.

Fig. 12 is a block diagram illustrating a structure of an air conditioner according to an exemplary embodiment. As shown in fig. 12, the air conditioner includes a microcontroller 105, and the microcontroller 105 includes: a first judging unit 1201, a first judging unit 1202, and a control unit 1203.

The first judging unit 1201 is configured to obtain indoor humidity and temperature information and judge whether an anti-condensation operation is required according to a first preset condition.

The second determination unit 1202 is configured to obtain the indoor humidity and determine whether the anti-condensation operation is required according to a second preset condition.

The control unit 1203 is configured to control to perform a condensation preventing operation when the first determining unit 1201 determines that the condensation preventing operation is required, or control to perform a self-cleaning operation when the second determining unit 1202 determines that the condensation preventing operation is required, and is further configured to control start times of the first determining unit 1201 and the second determining unit 1202.

In some optional embodiments, the control unit 1203 first controls the second determination unit 1202 to obtain the indoor humidity and determines whether the anti-condensation operation is required according to the second preset condition, and if so, the control unit 1203 performs the anti-condensation operation. After the condensation preventing operation is performed for a set time, the control unit 1203 controls the first determining unit 1201 to obtain the indoor humidity and temperature information and determine whether the condensation preventing operation is required according to a first preset condition.

In this embodiment, at first, carry out condensation prevention through promoting the air-out temperature, after condensation prevention operation carries out a period of time, humidity is still great, through the self-cleaning mode control indoor heat exchanger surface temperature who is contrary with condensation prevention operation to air conditioner adjustment process completely be less than dew point temperature, makes a large amount of moisture in the air condense, forms frost or ice layer on the heat exchanger surface, obtains condensation prevention's effect. This embodiment can not only effectively prevent the emergence of condensation, can not influence the refrigerated effect of air conditioner moreover, can also carry out the automatically cleaning of air conditioner, can be worried one's things more, has greatly promoted user's use and has experienced.

As described in the foregoing method embodiment, the control unit 1203 is configured to reduce the operating frequency of the air conditioner compressor or reduce the opening degree of the throttling component, or both the operating frequency of the air conditioner compressor and the opening degree of the throttling component when performing the anti-condensation operation. The control unit 1203 specifically reduces the operating frequency of the air conditioning compressor in the manner described in the foregoing method embodiments.

In some optional embodiments, as described in the previous method embodiments, the second preset condition comprises: and if the indoor humidity RH is greater than the set threshold RHT or the time that the indoor humidity RH is continuously greater than the set threshold RHT reaches the set duration, the anti-condensation operation is required.

In the foregoing embodiment, the control unit 1203 is specifically configured to raise or maintain the operating frequency of the compressor, and reduce the rotation speed of the indoor fan or turn off the indoor fan to frost the surface of the indoor heat exchanger of the air conditioner during the self-cleaning operation of the air conditioner; and switching the air conditioner to a heating mode to defrost the surface of the indoor heat exchanger of the air conditioner into water.

In some optional embodiments, to avoid the air conditioner outlet air temperature rising due to the long-time operation of the self-cleaning defrosting stage, the control unit 1203 is further configured to switch the air conditioner back to the cooling mode after the surface of the indoor heat exchanger of the air conditioner is defrosted.

In some alternative embodiments, to increase the anti-condensation effect, it is necessary to increase the amount of frost in the frost-condensation stage of the self-cleaning mode. The control unit 1203 is specifically configured to start the second determination unit 1202 during the process of frosting the surface of the indoor heat exchanger of the air conditioner, and raise the operation frequency of the air conditioner compressor, or prolong the frosting time, or raise the operation frequency of the air conditioner compressor and prolong the frosting time when the anti-condensation operation is required.

Along with the operation of the frost condensation stage of the self-cleaning mode, the temperature of the indoor heat exchanger is kept to be lower than the dew point temperature, the air outlet temperature of the air conditioner is low, discomfort is brought to users, and therefore the air outlet temperature needs to be adjusted in the frost condensation stage. The control unit 1203 is further configured to start the electric heating device after a first duration from a set time point, and to turn off the electric heating device after the electric heating device runs for a second duration.

In some optional embodiments, as shown in fig. 13, the air conditioner further includes a humidity sensor 106 for detecting the indoor humidity and sending the detected data to the first and second determining

units

1201 and 1202, so that the determining units determine whether condensation prevention is required according to different determining conditions.

It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A method for preventing condensation by self-cleaning, comprising:

obtaining indoor humidity and judging whether condensation preventing operation is needed or not, and if so, performing condensation preventing operation;

obtaining the indoor humidity again after the air conditioner runs for a set time and judging whether condensation prevention operation is needed or not; if still needed, controlling the air conditioner to perform self-cleaning operation to prevent condensation;

the anti-condensation operation comprises reducing the running frequency of the air-conditioning compressor, or reducing the opening of the throttling component, or reducing the running frequency of the air-conditioning compressor and reducing the opening of the throttling component;

the control air conditioner performs a self-cleaning operation, including: the running frequency of the compressor is increased or kept, and the rotating speed of the indoor fan is reduced or the indoor fan is turned off, so that the surface of the indoor heat exchanger of the air conditioner is frosted; after the surface of the indoor heat exchanger of the air conditioner is frosted, the air conditioner is switched to a heating mode, so that the surface of the indoor heat exchanger of the air conditioner is frosted into water;

in the process of frosting the surface of the indoor heat exchanger of the air conditioner, the method further comprises the following steps: obtaining indoor humidity and judging whether condensation prevention operation is needed or not; and if necessary, increasing the operating frequency of the air conditioner compressor, or prolonging the frosting time, or increasing the operating frequency of the air conditioner compressor and prolonging the frosting time.

2. The method of claim 1, wherein the two determinations of whether anti-condensation is required are made under the same or different conditions.

3. The method according to claim 1 or 2, characterized in that the conditions for the anti-condensation operation are: the indoor humidity RH is greater than the set threshold RHT, or the time that the indoor humidity RH is continuously greater than the set threshold RHT reaches the set duration.

4. The method of claim 1 or 2, wherein the indoor humidity is obtained by a sensor detection or by an algorithmic calculation.

5. An air conditioner comprising a microcontroller, wherein the microcontroller comprises:

a data unit for obtaining an indoor humidity;

the judging unit is used for judging whether condensation preventing operation is needed or not according to the indoor humidity; and the combination of (a) and (b),

the control unit is used for performing condensation prevention operation or controlling the air conditioner to perform self-cleaning operation when condensation prevention operation is required;

controlling an air conditioner to perform a self-cleaning operation, including: the running frequency of the compressor is increased or kept, and the rotating speed of the indoor fan is reduced or the indoor fan is turned off, so that the surface of the indoor heat exchanger of the air conditioner is frosted; switching the air conditioner to a heating mode to defrost the surface of the indoor heat exchanger of the air conditioner into water;

the control unit is also used for starting the data unit and the judgment unit in the process of frosting the surface of the indoor heat exchanger of the air conditioner, and increasing the operating frequency of the air conditioner compressor or prolonging the frosting time or increasing the operating frequency of the air conditioner compressor and prolonging the frosting time when the anti-condensation operation is required.

6. The air conditioner according to claim 5, wherein the conditions for judging whether the anti-condensation operation is required are the same or different for a plurality of times.

7. The air conditioner according to claim 5 or 6, wherein the conditions for performing the anti-condensation operation are: the indoor humidity RH is greater than the set threshold RHT, or the time that the indoor humidity RH is continuously greater than the set threshold RHT reaches the set duration.

8. The air conditioner according to claim 5 or 6, further comprising a humidity sensor for detecting indoor humidity, the humidity sensor transmitting detected data to the data unit.