Method, device and air conditioner for preventing condensation of air conditioner

Abstract

The present application relates to the technical field of air conditioners, and discloses a method for preventing condensation in an air conditioner. The method for preventing condensation in an air conditioner includes: when the air conditioner operates in a refrigeration mode, determining whether the indoor unit meets the condensation condition; when the indoor unit meets the condensation condition, controlling the heating of the liquid refrigerant flowing into the indoor unit, wherein the heating power is obtained according to the operating frequency of the compressor. The method for preventing condensation in an air conditioner provided by the embodiments of the present disclosure is to heat the refrigerant flowing into the indoor unit when the indoor unit meets the condensation condition, so as to change the temperature condition of condensation in the indoor unit by increasing the temperature of the refrigerant; during the control process, the heating power is adjusted according to the operating frequency of the compressor, so as to use the change of the heating power as a supplementary control measure for the limited influence of the operating frequency of the compressor on the temperature control of the liquid refrigerant flowing into the indoor unit. By coordinating the heating power and the operating frequency of the compressor, the occurrence of condensation problems in the indoor unit is jointly reduced. The present application also provides a device and an air conditioner for preventing condensation in an air conditioner.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent household appliances, for example, to a method, a device and an air conditioner for preventing condensation of an air conditioner. Background Art

[0002] With the development and progress of society and science and technology, household electrical appliance products that benefit thousands of households are constantly emerging. For example, air conditioner products that can effectively improve and maintain the indoor comfortable temperature environment in high-temperature summers or cold winters. The popularization of household air conditioners and central air conditioners has improved the living standards of residents while gradually exposing the problems existing in their use processes. One of them is the problem that the air conditioner is prone to condensation in the indoor unit when operating in a high-humidity environment.

[0003] The reasons for the condensation of the air conditioner are mainly divided into external factors and internal factors. The external factor is that the temperature and humidity of the indoor environment where the air conditioner is currently located are relatively high, and the amount of water vapor contained in the air is relatively large. The internal factor is that the temperature of the refrigerant flowing into the indoor unit during the refrigeration operation of the air conditioner is too low, causing a large amount of water vapor in the air flowing through the indoor unit to condense into liquid dew drops, thus resulting in the occurrence of the condensation problem.

[0004] In response to this air conditioner condensation problem, some air conditioner products are equipped with an anti-condensation function to suppress or even eliminate the amount of condensation by enabling the anti-condensation function when the air conditioner has a condensation problem.

[0005] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0006] In the related art, the anti-condensation function mainly adjusts the frequency of the compressor (such as reducing the frequency) or the throttling opening of the electronic expansion valve (such as increasing the opening), etc. Among them, the adjustment of the compressor frequency will cause a change in the amount of refrigerant discharged, and the adjustment of the throttling opening of the electronic expansion valve will also cause a change in the inflow rate of the indoor unit. Therefore, the above two methods both achieve anti-condensation by changing the refrigerant inflow rate. However, this method causes large fluctuations in the refrigerant flow rate inside the refrigerant pipeline, breaking the original balance state of the refrigerant flowing in the pipeline, and is prone to problems such as vibration and noise, which is not conducive to the stable operation of the air conditioner. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] The embodiments of the present disclosure provide a method, a device and an air conditioner for preventing condensation of an air conditioner to solve the technical problem of easy condensation of the indoor unit during refrigeration operation in the related art.

[0009] In some embodiments, a method for preventing condensation in an air conditioner includes:

[0010] When the air conditioner operates in the cooling mode, determining whether the indoor unit meets the condensation condition;

[0011] When the indoor unit meets the condensation condition, controlling the heating of the incoming liquid refrigerant of the indoor unit, where the heating power is obtained according to the operating frequency of the compressor.

[0012] In some alternative embodiments, obtaining the heating power according to the operating frequency of the compressor includes:

[0013] According to the operating frequency of the compressor, obtaining the corresponding heating power from a preset association relationship; where the association relationship includes one or more sets of one-to-one correspondence relationships between the operating frequencies of the compressor and the heating power.

[0014] In some alternative embodiments, the preset association relationship includes a target association relationship;

[0015] Before obtaining the corresponding heating power from the preset association relationship according to the operating frequency of the compressor, the method for preventing condensation in an air conditioner further includes:

[0016] Obtaining the temperature change trend of the incoming liquid refrigerant of the indoor unit, where the temperature change trend includes a temperature rising trend and a temperature falling trend;

[0017] Based on the temperature change trend, determining the target association relationship from a preset set of association relationships; where the set of association relationships includes one or more first association relationships corresponding to the temperature rising trend and one or more second association relationships corresponding to the temperature falling trend.

[0018] In some alternative embodiments, in the first association relationship, the operating power of the compressor and the heating power are positively correlated; and / or, in the second association relationship, the operating power of the compressor and the heating power are negatively correlated.

[0019] In some alternative embodiments, determining the target association relationship from the preset set of association relationships includes: determining the temperature rising rate of the temperature rising trend of the incoming liquid refrigerant; according to the temperature rising rate, obtaining the target association relationship from multiple first association relationships; and / or,

[0020] Determining the target association relationship from the preset set of association relationships includes: determining the temperature falling rate of the temperature falling trend of the incoming liquid refrigerant; according to the temperature rising rate, obtaining the target association relationship from multiple second association relationships.

[0021] In some alternative embodiments, heating the incoming liquid refrigerant of the indoor unit is performed by a heating device;

[0022] The method for preventing condensation in an air conditioner further includes:

[0023] When heating the refrigerant flowing into the indoor unit, obtain the operating current of the heating device;

[0024] Based on the operating current of the heating device, perform corresponding protection actions according to the overcurrent protection strategy.

[0025] In some alternative embodiments, the overcurrent protection strategy includes:

[0026] When A 1 = A 0 , the compressor of the air conditioner maintains the current operating frequency or reduces the frequency;

[0027] When A 1 > A 0 , reduce the heating power of the heating device;

[0028] When A 1 > A 0 and P 1 = P 最小 , the compressor of the air conditioner reduces the frequency;

[0029] wherein, A 1 is the operating current of the heating device, A 0 is the current protection threshold of the heating device, P 1 is the heating power of the heating device, and P 最小 is the minimum heating power of the heating device.

[0030] In the above-mentioned multiple alternative embodiments, the condensation conditions include:

[0031] T 内盘管 - T 露点 ≤ ΔT1;

[0032] wherein, T 内盘管 is the temperature of the inner coil, T 露点 is the current indoor dew point temperature, and ΔT1 is a preset temperature difference threshold.

[0033] In some embodiments, a device for preventing condensation in an air conditioner includes a processor and a memory storing program instructions, wherein the processor is configured to execute the air supply control method according to any one of the above embodiments when executing the program instructions.

[0034] In some embodiments, the air conditioner disclosed in the embodiments of the present disclosure includes a device for preventing condensation in an air conditioner according to any one of the above embodiments.

[0035] The method for preventing condensation in an air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects:

[0036] The method for preventing condensation in an air conditioner provided by an embodiment of the present disclosure is to heat the refrigerant flowing into the indoor unit when the indoor unit meets the condensation condition, that is, when condensation problems may occur or have already occurred in the indoor unit, so as to change the temperature condition of condensation in the indoor unit by increasing the temperature of the refrigerant, thereby achieving the purpose of reducing condensation; during the control process, the heating power is adjusted according to the operating frequency of the compressor, so as to change the heating power as a supplementary control measure for the limited influence of the operating frequency of the compressor on the temperature control of the incoming liquid refrigerant. Therefore, the present application can coordinate the heating power and the operating frequency of the compressor to jointly reduce the occurrence of condensation problems in the indoor unit.

[0037] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0039] Figure 1 is a schematic structural diagram of an indoor heat exchanger of an air conditioner provided by an embodiment of the present disclosure;

[0040] Figure 2 is a schematic flow chart of a method for preventing condensation in an air conditioner provided by an embodiment of the present disclosure;

[0041] Figure 3 is a schematic flow chart of a method for preventing condensation in an air conditioner provided by another embodiment of the present disclosure;

[0042] Figure 4 is a schematic diagram of a device for preventing condensation in an air conditioner provided by an embodiment of the present disclosure;

[0043] Figure 5 is a schematic diagram of a device for preventing condensation in an air conditioner provided by another embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the drawings. The attached drawings are only for reference and explanation, and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, a sufficient understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner.

[0045] In the description, claims, and the above-mentioned drawings of the embodiments of the present disclosure, terms such as "first" and "second" are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so as to implement the embodiments of the present disclosure described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion.

[0046] Unless otherwise specified, the term "plurality" means two or more.

[0047] In the embodiments of the present disclosure, the character " / " indicates that the front and rear objects are in an "or" relationship. For example, A / B means: A or B.

[0048] The term "and / or" is an associative relationship describing an object, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B these three relationships.

[0049] In an optional embodiment, the air conditioner includes an indoor unit and an outdoor unit. The indoor unit is provided with an indoor heat exchanger, an indoor fan, etc., which can be used to achieve functions such as cooperating with the refrigerant to exchange heat with the indoor environment; the outdoor unit is provided with an outdoor heat exchanger, an outdoor fan, a throttle valve, a compressor, a gas-liquid separator, etc., which can be used to achieve functions such as cooperating with the refrigerant to exchange heat with the outdoor environment, compressing the refrigerant, and throttling the refrigerant.

[0050] Here, components such as the indoor heat exchanger, the outdoor heat exchanger, the throttle valve, the compressor, and the gas-liquid separator are connected through a refrigerant pipeline to jointly form a refrigerant circulation system for circulating and transporting the refrigerant between the indoor and outdoor units; optionally, the refrigerant circulation system is at least defined with two refrigerant flow directions respectively for the cooling mode or the heating mode. Specifically, when the air conditioner operates in the cooling mode, the refrigerant circulation system transports the refrigerant in the first refrigerant flow direction. After the refrigerant is discharged from the compressor, it flows through the outdoor heat exchanger, the throttle valve, and the indoor heat exchanger in sequence, and then flows back to the compressor via the gas-liquid separator; when the air conditioner operates in the heating mode, the refrigerant circulation system transports the refrigerant in the second refrigerant flow direction. After the refrigerant is discharged from the compressor, it flows through the indoor heat exchanger, the throttle valve, and the outdoor heat exchanger in sequence, and then flows back to the compressor via the gas-liquid separator.

[0051] In the dew condensation problem involved in the embodiments of the present disclosure, it mainly occurs in the high-temperature and high-humidity environment in summer. At this time, the air conditioner operation mode is generally the cooling mode. Therefore, the embodiments of the present disclosure mainly perform corresponding control on the air conditioner in the refrigerant flow direction of the cooling mode.

[0052] In an optional embodiment, a heating device is provided at the refrigerant inlet port of the indoor heat exchanger in the cooling mode. The heating device can be controlled to start / stop heating and can heat the refrigerant flowing through the refrigerant inlet port when heating is started; through the heating of the heating device, the heat of the refrigerant flowing through the refrigerant inlet port can be increased and the refrigerant temperature can be raised, so that the refrigerant can flow into the indoor heat exchanger at a higher temperature than after throttling by the throttle valve.

[0053] Here, the surface temperature of the indoor heat exchanger of the indoor unit is mainly affected by the temperature of the refrigerant flowing through it, and the two temperatures show a positive correlation. That is to say, if the temperature of the refrigerant flowing into the indoor heat exchanger is low, the surface temperature of the indoor heat exchanger affected by it is also low; on the contrary, the surface temperature of the indoor heat exchanger is high. In this way, by controlling the heating of the heating device, the temperature of the flowing refrigerant can be affected, and then the surface temperature of the indoor heat exchanger can be changed, so as to adjust the temperature condition necessary for condensation to occur on the indoor heat exchanger, so as to achieve the effect of reducing or even eliminating condensation.

[0054] Optionally, the types of the heating device include but are not limited to resistance heating devices, electromagnetic heating devices, and the like. It should be understood that other types of heating devices in the related art that can be applied to directly heat fluids or heat the pipe body to indirectly heat fluids can also be applied to the air conditioner of the present application, so they should also be covered by the protection scope of the present application.

[0055] Figure 1 Shown is an indoor heat exchanger with an electromagnetic heating device 2 provided at the refrigerant inlet port 11 in an optional embodiment. The indoor heat exchanger includes a heat exchanger main body 1, a refrigerant inlet port 11, and a refrigerant outlet port 12. Here, the definition of refrigerant inflow or outflow corresponds to the refrigeration flow direction defined by the cooling mode. The electromagnetic heating device 2 is provided at the refrigerant inlet port 11 of the heat exchanger main body 1. In the cooling mode, the refrigerant flowing into the indoor heat exchanger through the refrigerant inlet port 11 is the low-temperature refrigerant after throttling. Therefore, by starting the heating of the electromagnetic heating device 2, the temperature of the throttled refrigerant can be effectively increased.

[0056] Optionally, the electromagnetic heating device 2 includes a heating pipe body connected in series to the refrigerant inlet port 11 and a heating coil spirally wound around the outer periphery of the heating pipe body. The heating coil can be connected to the power supply circuit of the air conditioner. Therefore, by controlling the on / off of the power supply circuit of the heating coil, the start / stop control of the electromagnetic heating device can be realized, and by controlling parameters such as the current / voltage supplied to the heating coil, the heating power / heating amount of the electromagnetic heating device can also be adjusted.

[0057] In some embodiments, the heating tube body can be made of a metal material with magnetic permeability, such as iron, aluminum alloy and other materials. In addition to meeting the requirements of magnetic permeability, since the heating tube body is connected in series to the refrigerant circulation pipeline, it is prone to more stress at the connection position with the refrigerant circulation pipeline. At the same time, the refrigerant impact pressure will also have a greater impact on the strength of the tube body itself and the stress at the connection position. Therefore, the selected material also needs to meet certain strength requirements.

[0058] In addition, since the heating tube body itself generates more heat under the electromagnetic action and its own temperature is likely to rise to a relatively high temperature, the selected material also needs to have certain requirements for temperature deformation resistance, so as to reduce the adverse effects such as thermal expansion deformation caused by the tube body heating up, and reduce the occurrence of problems such as pipeline deformation and fracture.

[0059] Combined with Figure 2 As shown, the embodiments of the present disclosure provide a method for preventing condensation in an air conditioner. This method can be applied to the condensation prevention control of the indoor units of various air conditioners, such as wall-mounted air conditioners, floor-standing air conditioners, window air conditioners, and central air conditioners. The main steps of this method include:

[0060] S201. When the air conditioner is operating in the cooling mode, determine whether the indoor unit meets the condensation condition;

[0061] In some optional embodiments, before performing step S201, the steps further include obtaining the current operating mode of the air conditioner; if the current operating mode of the air conditioner is the cooling mode, then perform step S201; if the current operating mode of the air conditioner is not the cooling mode, then do not execute the control process in this embodiment.

[0062] Here, when the current operating mode of the air conditioner is not the cooling mode, such as the heating mode, generally no condensation problem occurs inside the indoor unit under the indoor working conditions, and the air conditioner has no need for condensation prevention, so the control process in this embodiment is not executed.

[0063] In some optional embodiments, the condensation conditions include:

[0064] T 内盘管 -T 露点 ≤△T1;

[0065] Among them, T 内盘管 is the temperature of the inner coil, T 露点 is the current indoor dew point temperature, and △T1 is a preset temperature difference threshold.

[0066] In some optional embodiments, the value range of △T1 is 0.5 to 1.5 °C, and the specific value can be determined according to actual needs, such as 0.5 °C, 1 °C, 1.5 °C, and so on.

[0067] The dew point temperature is the temperature corresponding to when the water vapor in the air reaches saturation; when the actual temperature is less than the dew point temperature, some of the water vapor in the air will condense into liquid dew. The reason for the condensation problem in the air conditioner is generally that the refrigerant temperature flowing into the indoor heat exchanger is relatively low, and the surface temperature of the indoor heat exchanger also decreases accordingly. More water vapor in the indoor air driven by the indoor fan flowing through the indoor heat exchanger will gradually condense into liquid dew on the indoor heat exchanger.

[0068] Although the method of comparing the temperature of the inner coil of the indoor heat exchanger with the condensation temperature can intuitively determine whether the temperature condition for condensation occurs, when it is determined that the temperature of the inner coil is less than the condensation temperature, condensation problems generally have already occurred at this time, and there are dew drops condensed on the indoor heat exchanger. Therefore, this judgment method has the problem of lag; compared with the above judgment method, the condensation condition shown in this embodiment is to compare the magnitude relationship between the temperature difference value between the temperature of the inner coil and the current indoor dew point temperature and a preset temperature difference threshold. And when this temperature difference is less than or equal to the preset temperature difference threshold, it indicates that the current surface temperature state of the indoor heat exchanger of the air conditioner is close to the temperature condition for condensation but condensation has not occurred yet. Therefore, when the condensation condition is met, control is executed to perform corresponding anti-condensation operations, which can directly change the surface temperature of the indoor heat exchanger to adjust it to a temperature condition where condensation does not occur, so as to achieve the purpose of avoiding condensation in advance.

[0069] In some alternative embodiments, a temperature sensor is provided at the coil position of the indoor unit, and this temperature sensor can detect the temperature of the coil position of the indoor unit in real time; therefore, in this embodiment, the temperature of the inner coil for judging the condensation condition can be obtained through this temperature sensor.

[0070] S202. When the indoor unit meets the condensation condition, obtain the operating frequency of the compressor;

[0071] In this embodiment, when the indoor unit meets the condensation condition, it indicates that there is a tendency of condensation in the indoor unit in the current operating state of the air conditioner. Therefore, it is necessary to control and execute a preset anti-condensation operation to delay or eliminate this condensation tendency through the anti-condensation operation, so that the air conditioner can always maintain a state of less condensation or no condensation in the cooling mode, so as to improve the overall operating performance of the air conditioner.

[0072] In this embodiment, the preset anti-condensation operation is to adjust the heating power of the heating device to change the refrigerant temperature flowing into the indoor unit; here, the heating power of the heating device in this application is related to the operating frequency of the compressor. Therefore, it is necessary to first execute step S202 to obtain the current operating frequency of the compressor.

[0073] S203. Obtain the heating power according to the operating frequency of the compressor, and control the heating of the liquid refrigerant flowing into the indoor unit according to the heating power.

[0074] In some alternative embodiments, the operation of controlling the heating of the refrigerant flowing into the indoor unit in step S203 is achieved by means of the heating device shown above. Specifically, when the indoor unit meets the condensation condition, the heat generated by the heating device is used to heat the refrigerant flowing into the indoor unit. When the indoor unit does not meet the condensation condition, the heating device is maintained in a shutdown state, and at this time, the heating device does not heat the refrigerant. The method for preventing condensation of an air conditioner provided by the embodiments of the present disclosure is to heat the refrigerant flowing into the indoor unit when the indoor unit meets the condensation condition, that is, when condensation problems may occur or have occurred in the indoor unit, so as to change the temperature condition of condensation in the indoor unit by increasing the temperature of the refrigerant, thereby achieving the purpose of reducing condensation.

[0075] Here, during the operation of the air conditioner in a mode where condensation is likely to occur in the indoor unit, such as the cooling mode, the refrigerant flows through the outdoor heat exchanger and the throttling device in sequence after being discharged from the compressor and then flows into the indoor heat exchanger. The high or low discharge temperature of the compressor is greatly affected by the current operating frequency of the compressor, and the two are basically positively correlated. The high or low discharge temperature can further affect the temperature of the refrigerant flowing into the indoor heat exchanger. Therefore, the current operating frequency of the compressor can affect the condensation state of the air conditioner when operating in the cooling mode. Under the above-defined refrigerant flow direction, the high or low outdoor environment corresponding to the outdoor heat exchanger through which the refrigerant flows and the opening degree of the throttling device will also affect the temperature state of the refrigerant. Therefore, the regulation of the operating frequency of the compressor on the temperature of the refrigerant flowing into the indoor unit has relatively limited influence and is prone to errors. In this embodiment, the heating power is adjusted according to the operating frequency of the compressor, so as to change the heating power as a supplementary regulation measure for the limited influence of the operating frequency of the compressor on the temperature regulation of the refrigerant flowing into the indoor unit, so that the actual heating power of the heating device can more accurately match the current operating state of the compressor, and at the same time, the additional power consumption caused by too high heating power can be avoided. The present application coordinates the heating power and the operating frequency of the compressor to jointly reduce the occurrence of condensation problems in the indoor unit.

[0076] In some alternative real-time modes, "obtaining the heating power according to the operating frequency of the compressor" in step S203 includes: obtaining the corresponding heating power from the preset association relationship according to the operating frequency of the compressor.

[0077] Among them, the air conditioner presets at least one association relationship, and this association relationship includes one-to-one corresponding relationships between one or more groups of operating frequencies of the compressor and the heating power. Exemplarily, Table 1 shows an alternative association relationship. There are n groups of operating frequencies and heating powers in this association relationship, as shown in the following table.

[0078]

[0079] Table 1

[0080] Therefore, in the execution of step S203, the heating power matching the current operating frequency of the compressor can be obtained through the association relationship shown in Table 1, and then the operating state of the heating device can be adjusted according to the heating power.

[0081] In some further optional embodiments, the association relationship selected each time the above control process is executed is defined as the target association relationship.

[0082] When the air conditioner operates in the cooling mode, changes in factors such as the outdoor ambient temperature, the indoor ambient temperature, and the operating parameters of the air conditioner itself will cause the refrigerant flowing into the indoor heat exchanger to also show a certain temperature change trend during certain periods. For example, when the compressor operates at an increasing frequency, the exhaust temperature increases with the increase in the compressor operating frequency, and the temperature of the refrigerant flowing into the indoor heat exchanger will also show a certain upward trend; or, when the outdoor ambient temperature decreases, the heat dissipation of the refrigerant flowing through the outdoor heat exchanger increases, causing the temperature of the refrigerant flowing into the indoor heat exchanger to also show a certain downward trend, etc.; then in this embodiment, the corresponding association relationship is also selected according to the temperature change trend of the refrigerant flowing into the indoor heat exchanger, so that the adjusted heating power can be adapted to the current temperature change trend and the state of the compressor.

[0083] Then in this embodiment, before obtaining the corresponding heating power from the preset association relationship according to the operating frequency of the compressor, the method for preventing condensation of the air conditioner further includes: obtaining the temperature change trend of the liquid inlet refrigerant of the indoor unit; and determining the target association relationship from the preset set of association relationships based on the temperature change trend.

[0084] Optionally, the temperature change trend includes an increasing temperature trend and a decreasing temperature trend. The increasing temperature trend refers to a change trend in which the temperature generally shows a gradual increase, and the decreasing temperature trend refers to a change trend in which the temperature generally shows a gradual decrease.

[0085] Here, taking the moment when the indoor unit meets the condensation condition as the reference moment, the temperature change within the first set duration before this reference moment can be selected as the reference temperature for judging the temperature change trend. For example, setting the reference moment as t0, and the moment corresponding to the first set duration before this reference moment as t1 (t1 is before t0), where the temperature of the liquid inlet refrigerant corresponding to the moment t0 is T0, and the temperature of the liquid inlet refrigerant corresponding to the moment t1 is T1. By comparing the temperature values between T0 and T1, the temperature change trend can be judged, specifically including: in the case of T0 > T1, the temperature change trend is a decreasing temperature trend; in the case of T0 < T1, the temperature change trend is an increasing temperature trend.

[0086] Optionally, the first set duration is 30s, 1min, 2min, etc.

[0087] Similarly, as another alternative, the temperature change within the second set duration after the above-mentioned reference time can also be used as the reference temperature for judging the temperature change trend. For example, if the time corresponding to the second set duration after the reference time is t2 (t2 is after t0), and the temperature of the incoming liquid refrigerant corresponding to time t2 is T2, then the temperature change trend can also be judged by comparing the temperature values between T0 and T2.

[0088] Here, within the second set duration, the heating device does not heat the incoming liquid refrigerant until the target correlation is selected, so as to avoid the influence of the heating device on the temperature rise of the incoming liquid refrigerant.

[0089] Optionally, the second set duration is 30s, 1min, 2min, etc.

[0090] In this embodiment, the correlation set includes one or more first correlations corresponding to the heating trend and one or more second correlations corresponding to the cooling trend. Therefore, when it is determined that the temperature of the incoming liquid refrigerant of the indoor heat exchanger shows a heating trend, one of the first correlations is selected as the target correlation; or, when it is determined that the temperature of the incoming liquid refrigerant of the indoor heat exchanger shows a cooling trend, one of the second correlations is selected as the target correlation, and then the heating power matching the compressor operating frequency is obtained from the selected target correlation.

[0091] Exemplarily, Table 2 shows an optional correlation, which includes the one-to-one correspondence between the compressor operating frequency and the heating power corresponding to the heating trend and the cooling trend respectively, as shown in the following table

[0092]

[0093]

[0094] Table 2

[0095] In the correlation shown in Table 2, the frequency values of f 1 to f n gradually increase. Correspondingly, the power values of P 11 to P 1n also gradually increase, that is, in the first correlation, the operating power of the compressor and the heating power are positively correlated; and, the power values of P 21 to P 2n also gradually decrease, that is, in the second correlation, the operating power of the compressor and the heating power are negatively correlated.

[0096] Here, if the liquid inlet temperature shows an increasing trend when the compressor operates at a relatively low frequency, it indicates that less heat needs to be compensated by the heating device. Therefore, the heating power of the heating device can be set to a relatively low value. When the liquid inlet temperature shows a decreasing trend, it means that more heat needs to be compensated by the heating device. Therefore, the heating power of the heating device is set to a relatively high value. Also, if the liquid inlet temperature can only show an increasing trend when the compressor operates at a relatively high frequency, it indicates that more heat needs to be compensated by the heating device. Therefore, the heating power of the heating device is set to a relatively high value. When the liquid inlet temperature shows a decreasing trend, it means that less heat needs to be compensated by the heating device. Therefore, the heating power of the heating device needs to be set to a relatively low value.

[0097] Therefore, in this embodiment, the change of the liquid inlet temperature before heating is greatly affected by the operating frequency of the compressor. Therefore, the corresponding correlation relationship is selected in advance according to different temperature change trends, and then the heating power corresponding to the operating frequency of the compressor is determined, so that the adjusted heating power can more specifically control the temperature according to the change of the refrigerant liquid inlet temperature to meet the actual needs of air conditioner anti-condensation.

[0098] In some alternative embodiments, there are multiple preset first correlation relationships for the air conditioner, and different first correlation relationships respectively correspond to different degrees of increasing trends; and there are also multiple preset second correlation relationships, and different second correlation relationships respectively correspond to different degrees of decreasing trends. Here, the degree of the increasing or decreasing change trend can reflect to a certain extent the influence level of the current operating frequency of the compressor on the change of the liquid inlet refrigerant temperature. Therefore, selecting the corresponding heating power can achieve more precise temperature control.

[0099] Determining the target correlation relationship from the preset set of correlation relationships includes: determining the heating rate of the increasing trend of the liquid inlet refrigerant; obtaining the target correlation relationship from multiple first correlation relationships according to the heating rate; and / or, determining the cooling rate of the decreasing trend of the liquid inlet refrigerant; obtaining the target correlation relationship from multiple second correlation relationships according to the heating rate.

[0100] Exemplarily, the heating rate or the cooling rate v can be calculated by the following formula:

[0101]

[0102] In this way, the corresponding first correlation relationship can be determined as the target correlation relationship according to the calculated heating rate, or the corresponding second correlation relationship group can be determined as the target correlation relationship according to the calculated cooling rate.

[0103] Combined with Figure 3 As shown, another embodiment of the present disclosure provides a method for air conditioner anti-condensation. The main steps of this method include:

[0104] S301. The air conditioner operates in cooling mode;

[0105] In this embodiment, under high temperature conditions in summer, the air conditioner defaults to operate in cooling mode.

[0106] S302. Determine whether T 内盘管 -T 露点 ≤ 1°C; if so, execute step S303, if not, return to step S301 or end the process;

[0107] In this embodiment, T 内盘管 -T 露点 ≤ 1°C is the preset condensation condition, and 1°C is the preset temperature difference threshold ΔT1.

[0108] S303. Obtain the current inlet refrigerant temperature T0 and the first inlet refrigerant temperature T1;

[0109] In this embodiment, the current inlet refrigerant temperature T0 is the refrigerant temperature flowing into the indoor heat exchanger detected at the current moment, and the first inlet refrigerant temperature T1 is the refrigerant temperature flowing into the indoor heat exchanger detected at the moment corresponding to the first time period before the current moment.

[0110] S304. Determine whether T0 > T1, if so, execute step S305, if not, execute step S306;

[0111] In this embodiment, by comparing the temperature values between T0 and T1, the temperature change trend of the inlet refrigerant at the current operating frequency of the air conditioner compressor can be judged. If T0 > T1, it means the inlet refrigerant shows a warming trend; if T0 < T1, it means the inlet refrigerant shows a cooling trend.

[0112] S305. Obtain the heating power corresponding to the operating frequency of the compressor from the first correlation relationship, and execute step S307;

[0113] S306. Obtain the heating power corresponding to the operating frequency of the compressor from the second correlation relationship, and execute step S307;

[0114] S307. Control the heating device to heat the inlet refrigerant according to the heating power.

[0115] In this embodiment, the corresponding correlation relationship is selected according to different temperature change trends, and then the heating power corresponding to the compressor operating frequency is determined, so that the adjusted heating power can more specifically control the temperature according to the change of the refrigerant inlet temperature to meet the actual demand of air conditioner anti-condensation.

[0116] In some alternative embodiments, adjusting the heating power of the heating device causes a corresponding change in the overall current of the air conditioner. Therefore, for the safe operation of the air conditioner and to reduce the safety risks that may be caused by excessive current during high-power operation, the method for preventing condensation in the air conditioner further includes: when heating the incoming liquid refrigerant of the indoor unit, obtaining the operating current of the heating device; and based on the operating current of the heating device, performing corresponding protection actions according to the overcurrent protection strategy.

[0117] Using the preset overcurrent protection strategy to control and perform corresponding protection actions can effectively control the safety of the overall air conditioner circuit and the operating stability when the heating device is enabled.

[0118] Optionally, the overcurrent protection strategy includes: when A 1 = A 0 , the compressor of the air conditioner maintains the current operating frequency or reduces the frequency; when A 1 > A 0 , reducing the heating power of the heating device; when A 1 > A 0 and P 1 = P 最小 , the compressor of the air conditioner reduces the frequency.

[0119] Wherein, A 1 is the operating current of the heating device, A 0 is the current protection threshold of the heating device, P 1 is the heating power of the heating device, and P 最小 is the minimum heating power of the heating device.

[0120] Figure 4 FIG. is a schematic diagram of a device for preventing condensation in an air conditioner provided by an embodiment of the present disclosure.

[0121] Combined with Figure 4 shown, an embodiment of the present disclosure provides a device for preventing condensation in an air conditioner. This device can be applied to the condensation prevention control of the indoor units of various air conditioners such as wall-mounted air conditioners, floor-standing air conditioners, window air conditioners, and central air conditioners to control the above-mentioned air conditioners to execute the method for preventing condensation in the air conditioner shown in the foregoing embodiments.

[0122] The device for preventing condensation in the air conditioner includes:

[0123] A condensation determination module 41, which is configured to: when the air conditioner is operating in a cooling mode, determine whether the indoor unit meets the condensation condition;

[0124] A refrigerant heating module 42, which is configured to: when the indoor unit meets the condensation condition, control the heating of the incoming liquid refrigerant of the indoor unit, wherein the heating power is obtained according to the operating frequency of the compressor.

[0125] In some alternative embodiments, the refrigerant heating module 42 is specifically configured to:

[0126] Obtain the corresponding heating power from a preset association relationship according to the operating frequency of the compressor; wherein the association relationship includes one or more sets of one-to-one correspondence relationships between the operating frequency of the compressor and the heating power.

[0127] In some alternative embodiments, the preset association relationship includes a target association relationship;

[0128] The device for preventing condensation in an air conditioner further includes a temperature change determination module, which is configured to: before the refrigerant heating module 42 obtains the corresponding heating power from the preset association relationship according to the operating frequency of the compressor, obtain the temperature change trend of the incoming liquid refrigerant of the indoor unit, where the temperature change trend includes a temperature increase trend and a temperature decrease trend; based on the temperature change trend, determine the target association relationship from a preset set of association relationships; wherein, the set of association relationships includes one or more first association relationships corresponding to the temperature increase trend and one or more second association relationships corresponding to the temperature decrease trend.

[0129] In some alternative embodiments, in the first association relationship, the operating power of the compressor and the heating power are positively correlated; and / or, in the second association relationship, the operating power of the compressor and the heating power are negatively correlated.

[0130] In some alternative embodiments, the temperature change determination module is specifically configured to: determine the temperature increase rate of the incoming liquid refrigerant's temperature increase trend; according to the temperature increase rate, obtain the target association relationship from multiple first association relationships; and / or,

[0131] Determining the target association relationship from the preset set of association relationships includes: determining the temperature decrease rate of the incoming liquid refrigerant's temperature decrease trend; according to the temperature increase rate, obtain the target association relationship from multiple second association relationships.

[0132] In some alternative embodiments, heating the incoming liquid refrigerant of the indoor unit is performed by a heating device;

[0133] The device for preventing condensation in an air conditioner further includes:

[0134] A current acquisition module, which is configured to: when heating the incoming liquid refrigerant of the indoor unit, acquire the operating current of the heating device;

[0135] A current protection module, which is configured to: based on the operating current of the heating device, perform corresponding protection actions according to the overcurrent protection strategy.

[0136] In some alternative embodiments, the overcurrent protection strategy includes:

[0137] When A 1 = A 0When the time comes, the compressor of the air conditioner maintains the current operating frequency or reduces the frequency.

[0138] When A 1 > A 0 When this occurs, reduce the heating power of the heating device.

[0139] When A 1 > A 0 and P 1 = P 最小 At this time, the compressor of the air conditioner reduces the frequency.

[0140] Among them, A 1 is the operating current of the heating device, A 0 is the current protection threshold of the heating device, P 1 is the heating power of the heating device, P 最小 is the minimum heating power of the heating device.

[0141] In the above-mentioned multiple optional embodiments, the condensation conditions include:

[0142] T 内盘管 -T 露点 ≤△T1;

[0143] Among them, T 内盘管 is the temperature of the inner coil, T 露点 is the current indoor dew point temperature, and △T1 is a preset temperature difference threshold.

[0144] Combined with Figure 5 As shown, the embodiments of the present disclosure provide a device for preventing condensation of an air conditioner, including a processor 500 and a memory 501. Optionally, the device may further include a communication interface 502 and a bus 503. Among them, the processor 500, the communication interface 502, and the memory 501 can complete communication with each other through the bus 503. The communication interface 502 can be used for information transmission. The processor 500 can call the logical instructions in the memory 501 to execute the method for preventing condensation of the air conditioner in the above-mentioned embodiments.

[0145] In addition, when the logical instructions in the above-mentioned memory 501 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0146] The memory 501, being a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 500 executes functional applications and data processing by running the program instructions / modules stored in the memory 501, that is, implements the method for preventing condensation in an air conditioner in the above embodiments.

[0147] The memory 501 may include a program storage area and a data storage area. Among them, the program storage area can store an operating system and application programs required for at least one function; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 501 may include high-speed random access memory and may also include non-volatile memory.

[0148] The embodiments of the present disclosure provide an air conditioner including the above-described device for preventing condensation in an air conditioner.

[0149] The embodiments of the present disclosure provide a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the above method for preventing condensation in an air conditioner.

[0150] The embodiments of the present disclosure provide a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer is made to execute the above method for preventing condensation in an air conditioner.

[0151] The above computer-readable storage medium may be a transient computer-readable storage medium or a non-transient computer-readable storage medium.

[0152] The technical solutions of the embodiments of the present disclosure may be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiments of the present disclosure. The foregoing storage medium may be a non-transient storage medium, including: various media that can store program codes such as USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, or may also be a transient storage medium.

[0153] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groupings of these. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, or device comprising the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0154] Those skilled in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0155] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components can be or can not be physically separated. The components displayed as units can be or can not be physical units, that is, they can be located in one place or can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0156] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code that contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as combinations of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for preventing condensation in an air conditioner, characterized in that, it includes: When the air conditioner operates in cooling mode, determining whether the indoor unit meets the condensation condition; When the indoor unit meets the condensation condition, controlling the heating of the incoming liquid refrigerant of the indoor unit; Wherein the heating power is obtained according to the operating frequency of the compressor, including: Obtaining the temperature change trend of the incoming liquid refrigerant of the indoor unit, and the temperature change trend includes a temperature rising trend and a temperature dropping trend; Based on the temperature change trend, determining a target correlation relationship from a preset set of correlation relationships; wherein, the set of correlation relationships includes one or more first correlation relationships corresponding to the temperature rising trend, and one or more second correlation relationships corresponding to the temperature dropping trend; in the first correlation relationship, the operating frequency of the compressor is positively correlated with the heating power; in the second correlation relationship, the operating frequency of the compressor is negatively correlated with the heating power; According to the operating frequency of the compressor, obtaining the corresponding heating power from the target correlation relationship; wherein the target correlation relationship includes one or more sets of one-to-one correspondence relationships between the operating frequency of the compressor and the heating power.

2. The method according to claim 1, characterized in that, Determining the target correlation relationship from a preset set of correlation relationships includes: determining the temperature rising rate of the incoming liquid refrigerant's temperature rising trend; according to the temperature rising rate, obtaining the target correlation relationship from the multiple first correlation relationships; and / or, Determining the target correlation relationship from a preset set of correlation relationships includes: determining the temperature dropping rate of the incoming liquid refrigerant's temperature dropping trend; according to the temperature dropping rate, obtaining the target correlation relationship from the multiple second correlation relationships.

3. The method according to claim 1, characterized in that, Heating the incoming liquid refrigerant of the indoor unit is carried out by a heating device; The method further includes: When heating the incoming liquid refrigerant of the indoor unit, obtaining the operating current of the heating device; Based on the operating current of the heating device, performing corresponding protection actions according to the overcurrent protection strategy.

4. The method according to claim 3, characterized in that, The overcurrent protection strategy includes: When A 1 = A 0 the compressor of the air conditioner maintains the current operating frequency or reduces the frequency. When A 1 > A 0 Reduce the heating power of the heating device; When A 1 > A 0 and P 1 = P 最小 , the compressor of the air conditioner reduces its frequency; Among them, A 1 is the operating current of the heating device, A 0 is the current protection threshold of the heating device, P 1 is the heating power of the heating device, P 最小 is the minimum heating power of the heating device.

5. The method according to any one of claims 1 to 4, characterized in that, The condensation condition includes: T 内盘管 -T 露点 ≤△T1; Among them, T 内盘管 is the temperature of the inner coil, T 露点 is the current indoor dew point temperature, and △T1 is a preset temperature difference threshold value.

6. A device for preventing condensation in an air conditioner, characterized in that, The device includes a processor and a memory storing program instructions, and the processor is configured to execute the method for preventing condensation in an air conditioner according to any one of claims 1 to 5 when executing the program instructions.

7. An air conditioner, characterized in that, It includes the device for preventing condensation in an air conditioner according to claim 6.

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