Anti-condensation control method, controller, multi-split air conditioner and storage medium

Abstract

The present invention discloses an anti-condensation control method, a controller, a multi-split air conditioner and a storage medium, wherein a bypass throttling unit is provided in the multi-split air conditioner. When it is detected that the difference between the operating frequency of the compressor and the lowest limiting frequency of the compressor is less than a first frequency difference threshold, it indicates that the compressor can no longer reduce the frequency. If it is detected that the first temperature value of the indoor heat exchanger is close to the first dew point temperature of the environment where the indoor heat exchanger is located, there is a risk of condensation of the indoor heat exchanger. However, the operating frequency of the compressor can no longer be reduced. In order to prevent the condensation problem of the indoor heat exchanger, the opening of the bypass throttling unit can be adjusted according to the first temperature value and the first dew point temperature, and the refrigerant passing through the indoor heat exchanger can be adjusted to increase the temperature value of the indoor heat exchanger, thereby preventing the multi-split air conditioner from condensing.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to an anti-condensation control method, a controller, a multi-split air conditioner and a storage medium. Background Art

[0002] Currently, when operating an air conditioner in windless mode, deterioration of the heat exchanger leads to incomplete evaporation and low outlet air temperature, which is prone to condensation. Existing solutions primarily involve the outdoor unit adjusting the compressor frequency and the opening of the indoor unit valve based on the room temperature and humidity detected by the indoor unit, thereby raising the outlet air temperature and preventing condensation. However, for multi-split air conditioners with larger compressor capacity and a larger system rated capacity, if only one small indoor unit is running in windless mode, the indoor unit's capacity requirement is small while the compressor's displacement is large. Even when operating at the minimum frequency limit, the capacity still exceeds the indoor unit's requirements, causing the indoor evaporator temperature to continue to drop, leading to low outlet air temperature and condensation. Summary of the Invention

[0003] The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.

[0004] The embodiments of the present invention provide an anti-condensation control method, a controller, a multi-split air conditioner and a storage medium, which can prevent the multi-split air conditioner from having condensation problems.

[0005] An embodiment of a first aspect of the present invention provides an anti-condensation control method, which is applied to a controller of a multi-split air conditioner, wherein the multi-split air conditioner includes a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a bypass throttling unit, wherein the bypass throttling unit is arranged between the compressor and the outdoor heat exchanger, and the method includes:

[0006] obtaining the operating frequency of the compressor;

[0007] When the difference between the operating frequency and the lowest limiting frequency of the compressor is less than a first frequency difference threshold, obtaining a first temperature value of the indoor heat exchanger and a first dew point temperature of an environment where the indoor heat exchanger is located;

[0008] The opening degree of the bypass throttling unit is adjusted according to the first temperature value and the first dew point temperature.

[0009] According to the first embodiment of the present invention, the anti-condensation control method has at least the following beneficial effects: a bypass throttling unit is provided in a multi-split air conditioner. When it is detected that the difference between the operating frequency of the compressor and the minimum limiting frequency of the compressor is less than a first frequency difference threshold, indicating that the compressor can no longer reduce the frequency, a first temperature value of the indoor heat exchanger and a first dew point temperature of the environment in which the indoor heat exchanger is located are obtained, and the opening of the bypass throttling unit is adjusted according to the first temperature value and the first dew point temperature to prevent condensation from occurring in the multi-split air conditioner. In the technical solution of this embodiment, there is no need to adjust the operating frequency of the compressor. The amount of refrigerant passing through the indoor unit can be controlled by the opening of the bypass throttling unit, effectively controlling the temperature value of the indoor heat exchanger, thereby preventing condensation from occurring in the multi-split air conditioner.

[0010] In some embodiments, adjusting the opening of the bypass throttling unit according to the first temperature value and the first dew point temperature includes:

[0011] Performing difference processing on the first temperature value and the first dew point temperature to obtain a temperature difference;

[0012] The opening degree of the bypass throttling unit is adjusted according to the temperature difference.

[0013] In some embodiments, adjusting the opening of the bypass throttling unit according to the temperature difference includes:

[0014] determining a target temperature difference range according to the temperature difference;

[0015] The opening degree of the bypass throttling unit is adjusted according to the target temperature difference range.

[0016] In some embodiments, adjusting the opening of the bypass throttling unit according to the target temperature difference range includes:

[0017] determining an opening adjustment coefficient of the bypass throttling unit according to the target temperature difference range;

[0018] The opening of the bypass throttling unit is adjusted according to the opening adjustment coefficient.

[0019] In some embodiments, controlling the opening of the bypass throttling unit according to the target temperature difference range includes:

[0020] When the target temperature difference range is greater than a first temperature difference threshold, reducing the opening of the bypass throttling unit, the first temperature difference threshold being a positive number;

[0021] and / or,

[0022] When the target temperature difference range is smaller than a second temperature difference threshold, the opening degree of the bypass throttling unit is increased, and the second temperature difference threshold is smaller than or equal to 0.

[0023] In some embodiments, after reducing the opening of the bypass throttling unit, the method includes:

[0024] Obtaining a current opening value of the bypass throttling unit;

[0025] When the target temperature difference range is within the first temperature difference range and the current opening value is smaller than the sum of the initial opening value and the first opening threshold, the opening of the bypass throttling unit is increased.

[0026] In some embodiments, the air conditioner further includes an indoor unit throttling unit, which is arranged between the outdoor heat exchanger and the indoor heat exchanger, and the initial opening value is an opening value obtained based on the opening of the indoor unit throttling unit, the minimum limit frequency, the first frequency difference threshold and the operating frequency.

[0027] In some embodiments, adjusting the opening of the bypass throttling unit according to the temperature difference includes:

[0028] When the temperature difference is greater than a first temperature difference threshold, reducing the opening of the bypass throttling unit, wherein the first temperature difference threshold is a positive number;

[0029] and / or,

[0030] When the temperature difference is less than a second temperature difference threshold, the opening of the bypass throttling unit is increased, and the second temperature difference threshold is less than or equal to 0.

[0031] In some embodiments, the method further comprises:

[0032] When the difference between the operating frequency and the lowest limiting frequency of the compressor is greater than a first frequency difference threshold, obtaining a second temperature value of the indoor heat exchanger and a second dew point temperature of an environment where the indoor heat exchanger is located;

[0033] The operating frequency of the compressor is adjusted according to the second temperature value and the second dew point temperature.

[0034] A second aspect of the present invention provides a multi-split air conditioner, comprising a compressor, an outdoor heat exchanger, an indoor heat exchanger and a bypass throttling unit, wherein the bypass throttling unit is arranged on a bypass flow path between the compressor and the outdoor heat exchanger, and the bypass throttling unit is used to adjust the refrigerant flow rate flowing to the indoor heat exchanger.

[0035] An embodiment of the third aspect of the present invention provides a controller, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the anti-condensation control method described in the first aspect when executing the computer program.

[0036] A fourth embodiment of the present invention provides a multi-split air conditioner, comprising the controller described in the third aspect.

[0037] A fifth aspect of the present invention provides a computer-readable storage medium storing computer-executable instructions for executing the anti-condensation control method as described in the first aspect.

[0038] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purposes and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic diagram of a system architecture platform for executing an anti-condensation control method provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of a multi-split air conditioner for implementing an anti-condensation control method provided by an embodiment of the present invention;

[0041] Figure 3 This is a flow chart of an anti-condensation control method provided by an embodiment of the present invention;

[0042] Figure 4 is a flow chart of an anti-condensation control method provided by another embodiment of the present invention;

[0043] Figure 5 is a flow chart of an anti-condensation control method provided by another embodiment of the present invention;

[0044] Figure 6 is a flow chart of an anti-condensation control method provided by another embodiment of the present invention;

[0045] Figure 7 is a flow chart of an anti-condensation control method provided by another embodiment of the present invention;

[0046] Figure 8 This is a flow chart of an anti-condensation control method provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the characteristics, operations or features described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be exchanged or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various orders in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary order, unless otherwise specified that a certain order must be followed.

[0048] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0049] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0050] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0051] Currently, when operating an air conditioner in windless mode, deterioration of the heat exchanger leads to incomplete evaporation and low outlet air temperature, which is prone to condensation. Existing solutions primarily involve the outdoor unit adjusting the compressor frequency and the opening of the indoor unit valve based on the room temperature and humidity detected by the indoor unit, thereby raising the outlet air temperature and preventing condensation. However, for multi-split air conditioners with larger compressor capacity and a larger system rated capacity, if only one small indoor unit is running in windless mode, the indoor unit's capacity requirement is small while the compressor's displacement is large. Even when operating at the minimum frequency limit, the capacity still exceeds the indoor unit's requirements, causing the indoor evaporator temperature to continue to drop, leading to low outlet air temperature and condensation.

[0052] Based on the above situation, an embodiment of the present invention provides an anti-condensation control method, a controller, an air conditioner, and a computer-readable storage medium. The anti-condensation control method includes but is not limited to the following steps:

[0053] Get the operating frequency of the compressor;

[0054] When the difference between the operating frequency and the lowest limiting frequency of the compressor is less than a first frequency difference threshold, obtaining a first temperature value of the indoor heat exchanger and a first dew point temperature of an environment where the indoor heat exchanger is located;

[0055] The opening degree of the bypass throttling unit is adjusted according to the first temperature value and the first dew point temperature.

[0056] According to the technical solution of an embodiment of the present invention, a bypass throttling unit is provided in a multi-split air conditioner. When the difference between the operating frequency of the compressor and the minimum limiting frequency of the compressor is detected to be less than a first frequency difference threshold, it indicates that the compressor can no longer reduce its frequency. If the first temperature value of the indoor heat exchanger is detected to be close to the first dew point temperature of the environment in which the indoor heat exchanger is located, there is a risk of condensation in the indoor heat exchanger. However, the operating frequency of the compressor can no longer be reduced. To prevent condensation in the indoor heat exchanger, the opening of the bypass throttling unit can be adjusted according to the first temperature value and the first dew point temperature, thereby reducing the refrigerant passing through the indoor heat exchanger and increasing the temperature of the indoor heat exchanger, thereby preventing condensation in the multi-split air conditioner. In the technical solution of this embodiment, the amount of refrigerant passing through the indoor unit can be controlled by the opening of the bypass throttling unit without adjusting the operating frequency of the compressor, effectively controlling the temperature of the indoor heat exchanger, thereby preventing condensation in the multi-split air conditioner.

[0057] The embodiments of the present invention are further described below with reference to the accompanying drawings.

[0058] like Figure 1 As shown, Figure 1 Schematic diagram of a system architecture platform for executing an anti-condensation control method provided by an embodiment of the present invention.

[0059] The system architecture platform 1000 of the embodiment of the present invention includes one or more processors 1001 and a memory 1002. Figure 1 In the figure, a processor 1001 and a memory 1002 are taken as an example.

[0060] The processor 1001 and the memory 1002 may be connected via a bus or other means. Figure 1 The bus connection is taken as an example.

[0061] The memory 1002 is a non-transitory computer-readable storage medium that can be used to store non-transitory software programs and non-transitory computer executable programs. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-transitory memory, such as at least one disk storage device, a flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 1002 may optionally include a memory 1002 remotely located relative to the processor 1001, and these remote memories may be connected to the system architecture platform 1000 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0062] It should be noted that the system architecture platform 1000 may be a controller, or may be a server of the multi-split air conditioner itself, and this embodiment does not impose any specific limitation thereto.

[0063] It should be noted that the system architecture platform 1000 may have multi-threaded computing capabilities, or may have single-threaded computing capabilities, which is not specifically limited in this embodiment.

[0064] Those skilled in the art will understand that Figure 1 The device structure shown in the figure does not constitute a limitation on the system architecture platform 1000, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0065] exist Figure 1 In the system architecture platform 1000 shown, the processor 1001 can be used to call the anti-condensation control program of the multi-split air conditioner stored in the memory 1002, thereby implementing the anti-condensation control method.

[0066] like Figure 2 As shown, Figure 2Schematic diagram of a multi-split air conditioner for implementing an anti-condensation control method provided by an embodiment of the present invention. The multi-split air conditioner includes a compressor 210, an outdoor heat exchanger 220, at least two indoor throttling units 230, at least two indoor heat exchangers 240 corresponding to the indoor throttling units 230, a bypass throttling unit 250, a refrigerant channel switching unit 260, and a gas-liquid separator 270. One end of the compressor 210 is connected to a first port of the refrigerant channel switching unit 260, and the other end of the compressor 210 is connected to one end of the outdoor heat exchanger 220 via the bypass throttling unit 250 (i.e., the bypass throttling unit 250 is provided). On the bypass flow path between the compressor 210 and the outdoor heat exchanger 220, one end of the gas-liquid separator 270 is connected, the other end of the gas-liquid separator 270 is connected to the third port of the refrigerant channel switching unit 260, the other end of the outdoor heat exchanger 220 is connected to the second port of the refrigerant channel switching unit 260, one end of the indoor heat exchanger 240 is connected to one end of the outdoor heat exchanger 220 via the indoor throttling unit 230, and the other end of the indoor heat exchanger 240 is connected to the fourth port of the refrigerant channel switching unit 260. The indoor heat exchanger 240 may also be provided with a first temperature detection unit for detecting the temperature in the indoor heat exchanger 240, and a humidity detection unit for detecting the humidity of the environment in which the indoor heat exchanger 240 is located, and a second temperature detection unit for detecting the temperature of the environment in which the indoor heat exchanger 240 is located may also be provided near the indoor heat exchanger 240. The bypass throttling unit is used to adjust the refrigerant flow rate flowing to the indoor heat exchanger to reduce the amount of refrigerant passing through the indoor heat exchanger, thereby lowering the temperature value of the indoor heat exchanger and preventing condensation problems in the indoor heat exchanger.

[0067] It should be noted that at least one outdoor fan 280 is provided next to the outdoor heat exchanger 220 , and at least one indoor fan 290 is provided next to each indoor heat exchanger 240 , which is not specifically limited in this embodiment.

[0068] It should be noted that the stop valve 231 may be provided on both channels connected to the indoor heat exchanger 240 , or on one of the channels, or not. This embodiment does not specifically limit this.

[0069] It should be noted that the bypass throttling unit 250 may be an electronic expansion valve, or a throttling valve, which is not specifically limited in this embodiment.

[0070] It should be noted that the indoor throttling unit 230 may be a throttling valve, or a capillary tube, or an electronic expansion valve, which is not specifically limited in this embodiment.

[0071] It should be noted that the refrigerant channel switching unit 260 may be a four-way valve or a five-way valve, which is not specifically limited in this embodiment.

[0072] It is understandable that Figure 1 The system architecture platform can be integrated into Figure 2 In the multi-split air conditioner, you can also control Figure 2 The various units in the embodiment are not specifically limited in this embodiment.

[0073] Based on the hardware structure of the above system architecture platform and the various modules in the multi-split air conditioner, various embodiments of the anti-condensation control method of the present invention are proposed.

[0074] like Figure 3 As shown, Figure 3 FIG. 1 is a flow chart of an anti-condensation control method provided by an embodiment of the present invention. The anti-condensation control method of the embodiment of the present invention includes but is not limited to step S100, step S200 and step S300.

[0075] Step S100: obtaining the operating frequency of the compressor.

[0076] Specifically, during the operation of the multi-split air conditioner, the operating frequency of the compressor is detected in real time to determine the difference between the operating frequency of the compressor and the minimum limit frequency requirement preset by the system. If the operating frequency of the compressor is greater than the minimum limit frequency, it indicates that the operating frequency of the compressor can be adjusted; if the indoor unit's requirement for the operating frequency of the compressor is less than the minimum limit frequency, then the operating frequency of the compressor can only be equal to the minimum limit frequency, and the operating frequency of the compressor cannot be reduced any further at this time.

[0077] It should be noted that the minimum limiting frequency of the compressor is set according to the characteristics of the compressor, and this embodiment does not impose any specific limitation on it.

[0078] Step S200: When the difference between the operating frequency and the lowest limiting frequency of the compressor is less than a first frequency difference threshold, a first temperature value of the indoor heat exchanger and a first dew point temperature of an environment where the indoor heat exchanger is located are obtained.

[0079] Specifically, when the difference between the operating frequency of the compressor and its minimum limit frequency is less than the first frequency difference threshold, it indicates that although the operating frequency of the compressor is higher than the minimum limit frequency, it is already close to the minimum limit frequency. At this time, when the multi-split air conditioner needs to reduce the operating frequency of the compressor, such as the anti-condensation scenario, it is no longer possible to reduce the operating frequency of the compressor to prevent condensation in the indoor unit. Then, the first dew point temperature of the environment where the indoor heat exchanger is located and the first temperature value of the indoor heat exchanger are obtained. The first dew point temperature and the first temperature value are used to provide a data judgment basis for the subsequent control of the bypass throttling unit.

[0080] It should be noted that the first dew point temperature is a dew point temperature calculated based on the current humidity value of the environment where the indoor heat exchanger is located. The first dew point temperature is a variable that varies with the ambient humidity and is not specifically limited in this embodiment.

[0081] It should be noted that the first frequency difference threshold is a relatively small frequency value, which can be set to 4 Hz, or 5 Hz, or 3 Hz, and is not specifically limited in this embodiment.

[0082] Step S300: adjusting the opening of the bypass throttling unit according to the first temperature value and the first dew point temperature.

[0083] Specifically, based on the acquired first dew point temperature and first temperature value, the opening of the bypass throttling unit is adjusted to reduce the amount of refrigerant passing through the indoor heat exchanger, thereby increasing the temperature of the indoor heat exchanger and preventing condensation in the multi-split air conditioner. In this embodiment, the amount of refrigerant passing through the indoor unit can be controlled by adjusting the opening of the bypass throttling unit without adjusting the operating frequency of the compressor, effectively controlling the temperature of the indoor heat exchanger and preventing condensation in the multi-split air conditioner.

[0084] It should be noted that adjusting the opening of the bypass throttling unit according to the first temperature value and the first dew point temperature may be adjusting the opening of the bypass throttling unit according to the difference between the first temperature value and the first dew point temperature, or may be adjusting the opening of the bypass throttling unit according to the size of the first temperature value and the first dew point temperature. This embodiment does not specifically limit it.

[0085] Reference Figure 4 Step S300 includes but is not limited to the following steps S410 and S420:

[0086] Step S410 , performing difference processing on the first temperature value and the first dew point temperature to obtain a temperature difference.

[0087] Step S420: adjusting the opening of the bypass throttling unit according to the temperature difference.

[0088] Specifically, the difference between the first temperature value T2 and the first dew point temperature TH0 is calculated to obtain a temperature difference ΔT between the first temperature value T2 and the first dew point temperature TH0, i.e., ΔT equals T2-TH0. The opening of the bypass throttling unit is then adjusted based on the temperature difference ΔT to reduce the amount of refrigerant passing through the indoor heat exchanger, thereby increasing the temperature of the indoor heat exchanger, thereby preventing condensation in the multi-split air conditioner. In the technical solution of this embodiment, the amount of refrigerant passing through the indoor unit can be controlled by controlling the opening of the bypass throttling unit without adjusting the operating frequency of the compressor, effectively controlling the temperature of the indoor heat exchanger, thereby preventing condensation in the multi-split air conditioner.

[0089] In one embodiment, when the temperature difference is greater than a first temperature difference threshold, the opening of the bypass throttling unit is reduced, and the first temperature difference threshold is a positive number; and / or, when the temperature difference is less than a second temperature difference threshold, the opening of the bypass throttling unit is increased, and the second temperature difference threshold is less than or equal to 0.

[0090] It should be noted that the temperature difference ΔT may be equal to the first temperature value T2 minus the first dew point temperature TH0 , or may be equal to the first dew point temperature TH0 minus the first temperature value T2 , which is not specifically limited in this embodiment.

[0091] Reference Figure 5 Step S420 includes but is not limited to the following steps S510 and S520:

[0092] Step S510: determining a target temperature difference range according to the temperature difference;

[0093] Step S520: adjusting the opening of the bypass throttling unit according to the target temperature difference range.

[0094] Specifically, the target temperature difference range corresponding to the temperature difference value can be determined based on the temperature difference value, and then the opening of the bypass throttling unit can be adjusted based on the target temperature difference range. Multiple temperature difference ranges can be set, wherein some temperature difference ranges are ranges greater than the first temperature difference threshold, and some temperature difference ranges are ranges less than the second temperature difference threshold, wherein some temperature difference ranges are ranges between the first temperature difference threshold and the second temperature difference threshold.

[0095] It should be noted that each temperature difference range may correspond to an opening value, or may correspond to an adjustment coefficient, which is not specifically limited in this embodiment.

[0096] Reference Figure 6 Step S520 includes but is not limited to the following steps S610 and S620:

[0097] Step S610, determining the opening adjustment coefficient of the bypass throttling unit according to the target temperature difference range;

[0098] Step S620: adjusting the opening of the bypass throttling unit according to the opening adjustment coefficient.

[0099] Specifically, based on the determined target temperature difference range, a table of correspondences between preset temperature difference ranges and opening adjustment coefficients is consulted to determine the opening adjustment coefficient of the bypass throttling unit that needs to be adjusted. The opening of the bypass throttling unit is then adjusted based on the opening adjustment coefficient to regulate the refrigerant passing through the indoor heat exchanger, thereby increasing the temperature of the indoor heat exchanger and preventing condensation in the multi-split air conditioner. In the technical solution of this embodiment, the amount of refrigerant passing through the indoor unit can be controlled by adjusting the opening of the bypass throttling unit without adjusting the operating frequency of the compressor, effectively controlling the temperature of the indoor heat exchanger and thus preventing condensation in the multi-split air conditioner.

[0100] In one embodiment, the opening degree P2 of the bypass throttling unit is adjusted by comparing the temperature difference ΔT between the first temperature value T2 and the first dew point temperature TH0. The temperature difference ΔT is maintained within the temperature difference range shown in Table 1 for t1 minutes, and the opening degree P2 of the bypass throttling unit is adjusted. When the target temperature difference range is greater than a first temperature difference threshold, the opening degree P2 of the bypass throttling unit is reduced, and the first temperature difference threshold is a positive number; and / or when the target temperature difference range is less than a second temperature difference threshold, the opening degree P2 of the bypass throttling unit is increased, and the second temperature difference threshold is less than or equal to 0.

[0101] Table 1

[0102]

[0103]

[0104] Obtain the current opening value of the bypass throttling unit; when the target temperature difference range is within the first temperature difference range and the current opening value is less than the sum of the initial opening value and the first opening threshold, increase the opening of the bypass throttling unit. Specifically, when the opening P2 of the bypass throttling unit is lower than the initial opening P20 after adjustment, P20 is not adjusted downward, but the operating frequency of the compressor is adjusted according to Table 2 to adjust the refrigerant flow rate, and then the adjustment direction of the opening P2 of the bypass throttling unit is calculated according to the above embodiment, and then the first temperature value T2 of the indoor heat exchanger is adjusted, which can improve the accuracy of adjusting the opening P2 of the bypass throttling unit. It should be noted that the first opening threshold can be set according to the specific actual situation, and this embodiment does not specifically limit it.

[0105] Table 2

[0106]

[0107] It should be noted that the initial opening degree P20 is determined by the following formula: P20 = ((f0 + f01) / f1 - 1) * P1, where f0 is the compressor's minimum limiting frequency, f01 is the first frequency difference threshold, f1 is the compressor's operating frequency, and P1 is the indoor throttling unit. In other words, the initial opening degree P20 is the opening value obtained based on the indoor unit's throttling unit's opening degree P2, the minimum limiting frequency f0, the first frequency difference threshold f01, and the operating frequency f1.

[0108] It should be noted that f01 can be 4 Hz, 5 Hz, or 6 Hz, which is not specifically limited in this embodiment.

[0109] Reference Figure 7 The anti-condensation control method further includes but is not limited to the following steps S710 and S720:

[0110] Step S710: When the difference between the operating frequency and the lowest limiting frequency of the compressor is greater than a first frequency difference threshold, obtaining a second temperature value of the indoor heat exchanger and a second dew point temperature of the environment where the indoor heat exchanger is located;

[0111] Step S720: Adjust the operating frequency of the compressor according to the second temperature value and the second dew point temperature.

[0112] Specifically, when the difference between the current operating frequency of the compressor and the preset minimum limit frequency of the compressor is greater than the preset first frequency difference threshold, it indicates that the operating frequency of the compressor has adjustable space. When encountering different refrigerant demand scenarios, the operating requirements of the multi-split air conditioner can be met by adjusting the operating frequency of the compressor. For example, when preventing condensation in the indoor heat exchanger, the second temperature value of the indoor heat exchanger and the second dew point temperature of the environment where the indoor heat exchanger is located are obtained, and the operating frequency of the compressor is adjusted according to the obtained second temperature value and second dew point temperature to reduce the amount of refrigerant flowing to the indoor heat exchanger, thereby controlling the temperature value of the indoor heat exchanger, which can effectively prevent the problem of condensation in the multi-split air conditioner.

[0113] In one embodiment, if the difference between the second temperature value f2 of the indoor heat exchanger and the preset minimum frequency limit f0 of the compressor is greater than a preset first frequency difference threshold value f01 (i.e., f1-f0>f01), the bypass cutoff unit remains closed, the second temperature value T2 of the indoor heat exchanger and the indoor ambient humidity H1 are monitored, and the second dew point temperature TH1 corresponding to the ambient humidity is calculated to determine the value of ΔT, where ΔT = T2-TH1. Optionally, f01 is 4 Hz. When ΔT is greater than 0, the operating frequency of the compressor is adjusted based on other operating parameters. When ΔT is less than 0, the operating frequency of the compressor is adjusted based on Table 3, which shows the corresponding relationship between the temperature difference range of ΔT and the frequency adjustment coefficient of the compressor.

[0114] Table 3

[0115]

[0116] It should be noted that the number of temperature difference ranges is not specifically limited and can be set according to actual conditions. Each temperature difference range can correspond to a compressor operating frequency adjustment coefficient, or multiple temperature difference ranges can correspond to a compressor operating frequency adjustment coefficient. This embodiment does not impose specific limitations on this.

[0117] Reference Figure 8 Another embodiment of the present invention provides a flow chart of an anti-condensation control method, which includes but is not limited to the following steps S801, S802, S803, 804, 805, 806, 807, 808, 809, 810, 811, and 812:

[0118] Step S801, starting the windless mode of the multi-split air conditioner;

[0119] Step S802, conventional anti-condensation control mode;

[0120] Step S803, determining whether the no-wind running time is greater than t and the conditions f1-f0<f00 are met, if so, executing step S804, if not, executing step S802;

[0121] Determine whether the trigger conditions for the windless bypass flow path anti-condensation control mode are met. Specifically, the trigger conditions must meet the following conditions at the same time: a) the indoor unit is running for cooling; b) only one indoor unit is running, and this indoor unit is the minimum capacity indoor unit, and the windless mode is turned on for this indoor unit; c) the indoor unit has entered the windless operation for more than t minutes; d) when the indoor unit enters the windless operation state, the compressor operating frequency f1 is close to the minimum limit frequency f0, and the difference between the two is f1-f0<f00.

[0122] It should be noted that t can be set to 20 minutes, or can be set to 22 minutes. This embodiment does not make any specific limitation on it and can be set according to actual conditions.

[0123] It should be noted that f00 is the second frequency difference threshold, and f00 can be set to 6 Hz or 7 Hz. This embodiment does not make any specific limitation thereto and can be set according to actual conditions.

[0124] Step S804, entering the windless bypass flow path anti-condensation control mode;

[0125] Step S805: Determine whether f1 - f0 < f01. If yes, execute Step S806; if no, execute Step S810;

[0126] where f1 is the operating frequency of the compressor in the no-wind-sensation mode, f0 is the minimum limit frequency of the compressor set by the system, and f01 is the first frequency difference threshold;

[0127] It should be noted that f01 can be set to 4 Hz or 3 Hz. This embodiment does not specifically limit it and can be set according to the actual situation, as long as the first frequency difference threshold is less than the second frequency difference threshold.

[0128] Step S806: Open the bypass throttling unit at the initial opening;

[0129] Specifically, the calculation method of the initial opening is as follows: The initial opening is set to P20, and the initial opening P20 is calculated according to the following formula: P20 = ((f0 + f01) / f1 - 1) * P1.

[0130] where f0 is the minimum limit frequency of the compressor, f01 is the first frequency difference threshold, f1 is the operating frequency of the compressor, and P1 is the indoor throttling unit.

[0131] Step S807: Adjust the opening P2 of the bypass throttling unit according to Table 1 in the above embodiment;

[0132] Step S808: Determine whether P2 < P20 + 6. If yes, execute Step S809; if no, execute Step S807;

[0133] Step S809: Adjust the operating frequency of the compressor according to Table 2 in the above embodiment, and execute Step S805;

[0134] Step S810: Determine whether ΔT > 0. If yes, execute Step S811; if no, execute Step S812;

[0135] Step S811: Adjust the operating frequency of the compressor according to the energy demand of the multi-connected air conditioner, and execute Step S805;

[0136] Step S812: Adjust the operating frequency of the compressor according to Table 3 in the above embodiment, and execute Step S805.

[0137] It should be noted that the conditions for exiting the no-wind-sensation bypass flow path anti-condensation control mode can be any one of the following conditions: a) Remote control shutdown; b) Entering the non-cooling mode; c) Exiting the no-wind-sensation mode; d) More than 1 indoor unit is turned on.

[0138] The technical solution in this embodiment has the same beneficial effects as the corresponding steps in the above embodiment. It should be noted that this embodiment is only a specific embodiment of the anti-condensation control method, and is not the only embodiment of the anti-condensation control method. It can also be changed according to actual conditions. Figure 3-Figure 7 Combining the various steps of the embodiment in the embodiment can obtain another embodiment of the anti-condensation control method.

[0139] Based on the above-mentioned anti-condensation control method, various embodiments of the controller, the multi-split air conditioner and the computer-readable storage medium of the present invention are respectively proposed below.

[0140] One embodiment of the present invention provides a controller, which includes a processor, a memory, and a computer program stored in the memory and executable on the processor.

[0141] The processor and the memory may be connected via a bus or other means.

[0142] It should be noted that the controller in this embodiment may include: Figure 1 The processor and memory in the illustrated embodiment both belong to the same inventive concept, and therefore both have the same implementation principles and beneficial effects, which will not be described in detail here.

[0143] The non-transient software program and instructions required to implement the anti-condensation control method of the above embodiment are stored in the memory, and when executed by the processor, the anti-condensation control method of the above embodiment is executed.

[0144] One embodiment of the present invention provides a multi-split air conditioner, which includes the controller of the above embodiment. The technical problems solved, technical means and technical effects achieved are consistent with those of the controller of the above embodiment and will not be described in detail here.

[0145] The embodiment of the present invention further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to execute the above-mentioned anti-condensation control method, for example, Figure 1 The execution of one of the processors 1001 in the embodiment of the present invention may cause the one or more processors to execute the anti-condensation control method in the embodiment of the present invention, for example, executing the above-described Figure 3 Steps S100 to S300 of the method, Figure 4 Steps S410 to S420 of the method, Figure 5 Steps S510 to S520 of the method, Figure 6 Steps S610 to S620 of the method, Figure 7 Steps S710 to S720 of the method and Figure 8Method steps S801 to S812.

[0146] Those skilled in the art will appreciate that all or some of the steps and systems in the method disclosed above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include a computer-readable storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer-readable storage medium is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer-readable storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disks (DVD), or other optical disk storage, magnetic cassettes, magnetic tapes, magnetic disk storage, or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0147] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present application.

Claims

1. A method for preventing condensation, characterized in that: A controller for a multi-split air conditioner, the multi-split air conditioner comprising a compressor, an outdoor heat exchanger, an indoor heat exchanger, and a bypass throttling unit, the bypass throttling unit being disposed on a bypass flow path between the compressor and the outdoor heat exchanger, the method comprising: obtaining the operating frequency of the compressor; When the difference between the operating frequency and the lowest limiting frequency of the compressor is less than a first frequency difference threshold, obtaining a first temperature value of the indoor heat exchanger and a first dew point temperature of an environment where the indoor heat exchanger is located; adjusting the opening of the bypass throttling unit according to the first temperature value and the first dew point temperature; wherein, after reducing the opening of the bypass throttling unit, obtaining the current opening value of the bypass throttling unit; increasing the opening of the bypass throttling unit when the target temperature difference range is within a first temperature difference range and the current opening value is less than the sum of the initial opening value and a first opening threshold, wherein the target temperature difference range is determined by the temperature difference between the first temperature value and the first dew point temperature; In addition, the initial opening value is determined according to the following formula: P20 = ((f0+f01) / f1-1)*P1, where f0 is the minimum limit frequency of the compressor, f01 is the first frequency difference threshold, f1 is the operating frequency of the compressor, and P1 is the opening of the indoor throttling unit.

2. The anti-condensation control method according to claim 1, characterized in that: The adjusting the opening of the bypass throttling unit according to the first temperature value and the first dew point temperature includes: Performing difference processing on the first temperature value and the first dew point temperature to obtain a temperature difference; The opening degree of the bypass throttling unit is adjusted according to the temperature difference.

3. The anti-condensation control method according to claim 2, characterized in that: The adjusting the opening of the bypass throttling unit according to the temperature difference includes: determining a target temperature difference range according to the temperature difference; The opening degree of the bypass throttling unit is adjusted according to the target temperature difference range.

4. The anti-condensation control method according to claim 3, characterized in that: The adjusting the opening of the bypass throttling unit according to the target temperature difference range includes: determining an opening adjustment coefficient of the bypass throttling unit according to the target temperature difference range; The opening of the bypass throttling unit is adjusted according to the opening adjustment coefficient.

5. The anti-condensation control method according to claim 3, characterized in that: The controlling the opening of the bypass throttling unit according to the target temperature difference range includes: When the target temperature difference range is greater than a first temperature difference threshold, reducing the opening of the bypass throttling unit, the first temperature difference threshold being a positive number; and / or, When the target temperature difference range is smaller than a second temperature difference threshold, the opening degree of the bypass throttling unit is increased, and the second temperature difference threshold is smaller than or equal to 0.

6. The anti-condensation control method according to claim 2, characterized in that: The adjusting the opening of the bypass throttling unit according to the temperature difference includes: When the temperature difference is greater than a first temperature difference threshold, reducing the opening of the bypass throttling unit, wherein the first temperature difference threshold is a positive number; and / or, When the temperature difference is less than a second temperature difference threshold, the opening of the bypass throttling unit is increased, and the second temperature difference threshold is less than or equal to 0.

7. The anti-condensation control method according to claim 1, characterized in that: The method further comprises: When the difference between the operating frequency and the lowest limiting frequency of the compressor is greater than a first frequency difference threshold, obtaining a second temperature value of the indoor heat exchanger and a second dew point temperature of an environment where the indoor heat exchanger is located; The operating frequency of the compressor is adjusted according to the second temperature value and the second dew point temperature.

8. A multi-split air conditioner, characterized in that: Used to execute the anti-condensation control method described in any one of claims 1 to 7, the multi-split air conditioner includes a compressor, an outdoor heat exchanger, an indoor heat exchanger and a bypass throttling unit, the bypass throttling unit is arranged on a bypass flow path between the compressor and the outdoor heat exchanger, and the bypass throttling unit is used to adjust the refrigerant flow flowing to the indoor heat exchanger.

9. A controller, characterized in that: The device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the anti-condensation control method according to any one of claims 1 to 7 when executing the computer program.

10. A multi-split air conditioner, characterized in that: Includes the controller according to claim 9.

11. A computer-readable storage medium, characterized in that Computer-executable instructions are stored, and the computer-executable instructions are used to execute the anti-condensation control method according to any one of claims 1 to 7.

Images