Control method for air conditioning unit, computer storage medium and air conditioning unit

Abstract

The invention relates to a control method for an air conditioning unit, a computer storage medium and the air conditioning unit. The air conditioning unit comprises a plurality of indoor units connected in parallel, each indoor unit is connected with a throttling component and an on-off valve, the throttling components are connected with the on-off valves in parallel, and the control method comprises the steps that when any indoor unit is in a cold air prevention mode, the on-off valves are connected with the throttling components in parallel; the actual opening degree of the throttling component connected with the indoor unit is obtained; the actual opening degree is compared with the preset maximum opening degree of the throttling component; and when the actual opening degree is equal to the preset maximum opening degree, the on-off valve connected with the throttling component in parallel is controlled to be opened. According to the control method, the coil temperature of the indoor unit can be rapidly increased, the time for executing the cold air prevention mode is shortened, and the use experience of a user is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a control method for an air conditioning unit, a computer storage medium, and an air conditioning unit. Background Art

[0002] An air conditioning unit is a refrigeration cycle system consisting of one or more outdoor units connected to several indoor units of varying or identical types and capacities. It provides conditioned air to one or more areas. Air conditioning units offer numerous advantages, including high energy efficiency, space savings, flexible design, and reliable operation. They are widely used in shopping malls, hospitals, schools, residences, and other locations.

[0003] In order to improve user comfort, air-conditioning units usually execute the anti-cold wind mode during the startup phase in low-temperature environments (such as in winter). In addition, during the operation of the air-conditioning unit, the coil temperature of the indoor unit may be too low due to reasons such as reduced output capacity of the outdoor unit, uneven refrigerant distribution, and excessively fast wind speed of the indoor fan, causing the indoor unit to trigger the anti-cold wind control logic. The refrigerant pipeline lengths between the indoor and outdoor units of the air-conditioning unit are different, which can easily cause refrigerant deviation. Once some indoor units execute the anti-cold wind mode, it is difficult to quickly increase the coil temperature, resulting in the anti-cold wind mode being executed for too long or frequently, which greatly reduces the user experience.

[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the Invention

[0005] To address or, to a certain extent, improve the technical problem in the prior art that air conditioning units have difficulty efficiently executing a cold wind prevention mode, the present invention provides a control method for an air conditioning unit. The air conditioning unit includes a plurality of indoor units connected in parallel, each of the indoor units being connected to a throttle component and an on-off valve, the throttle component being connected in parallel with the on-off valve. The control method comprises: when any one of the indoor units is in the cold wind prevention mode, obtaining the actual opening of the throttle component connected to the indoor unit; comparing the actual opening with a preset maximum opening of the throttle component; and when the actual opening equals the preset maximum opening, controlling the on-off valve connected in parallel with the throttle component to open.

[0006] Those skilled in the art will appreciate that the control method for an air conditioning unit according to the present invention implements the following control logic: When any indoor unit is in cold air prevention mode, the actual opening of the throttle component connected to that indoor unit is first obtained; then, the obtained actual opening is compared with the preset maximum opening of the throttle component; if the actual opening equals the preset maximum opening, indicating that the refrigerant flow cannot be increased by adjusting the opening of the throttle component, the on-off valve connected in parallel with the throttle component is controlled to open. Because the throttle component can expand and reduce the pressure of the refrigerant flowing through it, the refrigerant branch containing the throttle component has a relatively high resistance. Therefore, when the on-off valve connected in parallel with the throttle component is opened, the resistance of the refrigerant branch containing the on-off valve is reduced, allowing more refrigerant to flow along this refrigerant branch, allowing more high-temperature, high-pressure refrigerant to be distributed to the indoor unit, thereby rapidly increasing the coil temperature of the indoor unit, shortening the time it takes to execute cold air prevention mode, and improving the user experience.

[0007] In the preferred technical solution of the control method for an air conditioning unit, when the actual opening is less than the preset maximum opening, the throttling component is controlled to increase its opening. When the actual opening of the throttling component is less than the preset maximum opening, increasing the opening of the throttling component can appropriately increase the amount of refrigerant flowing through the indoor unit, thereby raising the coil temperature of the indoor unit. Furthermore, this configuration can avoid frequent opening of the on-off valve, preventing large fluctuations in refrigerant distribution that could affect system stability.

[0008] In the preferred technical solution of the control method for the air conditioning unit described above, each indoor unit includes an indoor heat exchanger and an indoor fan, and the control method further includes: obtaining the coil temperature of each powered-on indoor heat exchanger; comparing each coil temperature with a preset temperature threshold; and based on the comparison result, determining whether the corresponding indoor unit needs to execute the cold wind prevention mode and adjusting the speed of the corresponding indoor fan. Through the above-mentioned configuration, the timing of executing the cold wind prevention mode can be precisely controlled based on the coil temperature of the indoor heat exchanger, and the speed of the indoor fan can be precisely adjusted.

[0009] In the preferred technical solution of the control method for the air-conditioning unit, the preset temperature thresholds include: a first preset coil temperature, which is equal to the indoor ambient temperature plus a preset temperature difference; a second preset coil temperature, which is greater than the first preset coil temperature; and a third preset coil temperature, which is greater than the second preset coil temperature; wherein, when the coil temperature is less than the third preset coil temperature, it is determined that the indoor unit needs to execute the anti-cold wind mode; when the coil temperature is greater than or equal to the third preset coil temperature, it is determined that the indoor unit does not need to execute the anti-cold wind mode; and when the coil temperature is less than When the first preset coil temperature is reached, the indoor fan is controlled to stop; when the coil temperature is greater than or equal to the first preset coil temperature and less than the second preset coil temperature, the indoor fan is controlled to operate at a first preset wind speed; when the coil temperature is greater than or equal to the second preset coil temperature and less than the third preset coil temperature, the indoor fan is controlled to operate at a second preset wind speed; when the coil temperature is greater than or equal to the third preset coil temperature, the indoor fan is controlled to operate at a third preset wind speed; wherein the second preset wind speed is greater than the first preset wind speed and less than the third preset wind speed. Through the above settings, the speed of the indoor fan can be controlled in zones according to the actual coil temperature to better meet design requirements.

[0010] In a preferred embodiment of the control method for an air conditioning unit, before comparing the actual opening with the preset maximum opening of the throttle component, the control method further comprises: comparing the coil temperature corresponding to the indoor unit that does not need to execute the cold wind prevention mode with a fourth preset coil temperature; when the coil temperature is greater than the fourth preset coil temperature, controlling the corresponding throttle component to reduce its opening; and when the coil temperature is less than or equal to the fourth preset coil temperature, controlling the corresponding throttle component to maintain its opening, wherein the fourth preset coil temperature is greater than the third preset coil temperature. When the coil temperature of the indoor heat exchanger is high (greater than the fourth preset coil temperature), by appropriately reducing the opening of the throttle component of the indoor unit, more refrigerant can flow to the indoor unit that executes the cold wind prevention mode, thereby further shortening the time it executes the cold wind prevention mode. In addition, when the coil temperature of the indoor heat exchanger is less than or equal to the fourth preset coil temperature, the throttle component of the indoor unit is maintained open to ensure system stability.

[0011] In the preferred technical solution of the control method for the air conditioning unit described above, when there are multiple indoor units that do not need to execute the cold wind prevention mode, the control method further includes: sorting the coil temperatures corresponding to the multiple indoor units that do not need to execute the cold wind prevention mode in descending order; and adjusting the throttling components corresponding to the indoor units that do not need to execute the cold wind prevention mode based on the sorting results. When there are multiple indoor units that do not need to execute the cold wind prevention mode, by sequentially adjusting the corresponding throttling components in descending order of coil temperatures, single adjustment factors can be reduced, large fluctuations in refrigerant distribution can be avoided, and system stability can be further improved.

[0012] In the preferred technical solution of the control method for an air conditioning unit, when multiple indoor units are in the cold wind prevention mode, the control method further includes: obtaining the coil temperature of each indoor unit in the cold wind prevention mode; sorting the coil temperatures in ascending order; and adjusting the throttling components or on-off valves corresponding to the indoor units in the cold wind prevention mode based on the sorting results. When multiple indoor units are simultaneously in the cold wind prevention mode, prioritizing adjustment of indoor units with lower coil temperatures can significantly shorten the time they spend in the cold wind prevention mode, thereby improving the user experience.

[0013] In the preferred technical solution of the control method for the air-conditioning unit, after a preset time period, the on-off valve is controlled to close to prevent obvious uneven distribution of the refrigerant.

[0014] To solve or, to a certain extent, improve the technical problem in the prior art that air conditioning units have difficulty efficiently executing a cold air prevention mode, the present invention provides a computer storage medium having a computer program stored therein, and the computer program can be executed by a processor to implement the control method for an air conditioning unit according to any of the above items.

[0015] To solve or, to a certain extent, improve the technical problem of conventional air conditioning units having difficulty efficiently executing a cold air prevention mode, the present invention provides an air conditioning unit. The air conditioning unit implements the control method for an air conditioning unit described in any of the above items, and the air conditioning unit includes: a plurality of indoor units connected in parallel; a throttle component, each of the throttle components being connected to a corresponding indoor unit; and an on-off valve, each of the on-off valves being connected in parallel to a corresponding throttle component. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0017] Figure 1is a system configuration diagram of an embodiment of an air conditioning unit of the present invention;

[0018] Figure 2 1 is a flow chart of a control method for an air-conditioning unit according to the present invention;

[0019] Figure 3 is a first flow chart of a first embodiment of a control method for an air-conditioning unit according to the present invention;

[0020] Figure 4 is a second flow chart of the first embodiment of the control method for an air-conditioning unit according to the present invention;

[0021] Figure 5 It is a partial flow chart of the second embodiment of the control method for an air-conditioning unit according to the present invention.

[0022] List of reference numerals:

[0023] 100. Air conditioning unit; 110. Outdoor unit; 111. Compressor; 112. Outdoor heat exchanger; 113. Outdoor fan; 114. Liquid storage tank; 120. Indoor unit; 121. Indoor heat exchanger; 122. Indoor fan; 123. Throttling component; 124. On-off valve. DETAILED DESCRIPTION

[0024] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art will appreciate that these embodiments are intended solely to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. It should be noted that, in the description of the present invention, the terms "first" and "second" are used solely for descriptive purposes and are not to be construed as indicating or implying relative importance.

[0025] In order to solve or to some extent improve the technical problem in the prior art that air conditioning units have difficulty in efficiently executing a cold wind prevention mode, the present invention provides a control method for an air conditioning unit 100. The air conditioning unit 100 includes a plurality of indoor units 120 connected in parallel, each of the indoor units 120 being connected to a throttle component 123 and an on-off valve 124, wherein the throttle component 123 and the on-off valve 124 are connected in parallel, and the control method comprises: when any indoor unit 120 is in the cold wind prevention mode, obtaining the actual opening of the throttle component 123 connected to the indoor unit 120 (step S1); comparing the actual opening with a preset maximum opening of the throttle component 123 (step S2); and when the actual opening is equal to the preset maximum opening, controlling the on-off valve 124 connected in parallel with the throttle component 123 to open (step S3).

[0026] Figure 1 : is a system configuration diagram of an embodiment of the air conditioning unit of the present invention. Figure 1As shown, in one or more embodiments, the air conditioning unit 100 of the present invention includes an outdoor unit 110 (which is generally located outdoors) and three parallel indoor units 120 (which are generally located indoors or in a room). Alternatively, the number of indoor units 120 can be set to any other suitable number, more or less than three. Depending on actual needs, the configurations of the multiple indoor units 120 can be the same or different.

[0027] like Figure 1 As shown, in one or more embodiments, the outdoor unit 110 includes components such as a compressor 111, an outdoor heat exchanger 112, an outdoor fan 113, and a liquid storage tank 114. The compressor 111 may be, but is not limited to, an inverter compressor. There may be one or more compressors 111. The outdoor heat exchanger 112 may be, but is not limited to, a finned coil heat exchanger. The outdoor fan 113 is positioned opposite the outdoor heat exchanger 112 to improve the heat exchange efficiency between the outside air and the outdoor heat exchanger 112.

[0028] like Figure 1 As shown, in one or more embodiments, each indoor unit 120 includes components such as an indoor heat exchanger 121, an indoor fan 122, a throttling component 123, and an on-off valve 124. The indoor heat exchanger 121 may be, but is not limited to, a finned coil heat exchanger. The indoor fan 122 is positioned opposite the indoor heat exchanger 121 to improve the heat exchange efficiency between the indoor air and the indoor heat exchanger 121. Each indoor heat exchanger 121 is connected to a throttling component 123 and an on-off valve 124. The on-off valve 124 is arranged in parallel with the throttling component 123. The throttling component 123 may be, but is not limited to, an electronic expansion valve. The on-off valve 124 may be, but is not limited to, a solenoid valve.

[0029] Continue to see Figure 1 , the exhaust port of the compressor 111 (not marked in the figure) is respectively connected to each indoor heat exchanger 121. Each indoor heat exchanger 121 is respectively connected to a throttling component 123 and an on-off valve 124 arranged in parallel. The outdoor heat exchanger 112 is connected to the air intake port (not marked in the figure) of the compressor 111. When the compressor 111 is running, the refrigerant will flow in the direction of "compressor 111-indoor heat exchanger 121-throttling component 123-outdoor heat exchanger 112-compressor 111", thereby forming a circulation loop in the heating mode. Alternatively, the air-conditioning unit 100 also includes a four-way valve (not shown in the figure) so as to realize the mutual conversion between the heating mode and the cooling mode with the help of the four-way valve.

[0030] Below, combined with the attached Figure 2-Figure 5 The control method for the air conditioning unit 100 of the present invention is described in detail. It should be noted that the control method for the air conditioning unit 100 of the present invention can be executed in any of the air conditioning units 100 in the above embodiments, and can also be applied to other suitable air conditioning units 100.

[0031] Figure 2 FIG. 1 is a flow chart of the control method for an air-conditioning unit according to the present invention. Figure 2 As shown, in one or more embodiments, when the control method for the air conditioning unit 100 of the present invention begins, step S1 is first executed. That is, when any indoor unit 120 is in cold air prevention mode, the actual opening of the throttle component 123 connected to the indoor unit 120 is obtained. Next, step S2 is executed, which compares the actual opening with the preset maximum opening of the throttle component 123. When the actual opening is equal to the preset maximum opening, the on-off valve 124 connected in parallel with the throttle component 123 is controlled to open (i.e., step S3).

[0032] Figure 3 FIG. 1 is a first flow chart of a first embodiment of a control method for an air-conditioning unit according to the present invention. Figure 3 As shown, in one or more embodiments, when the control method for the air-conditioning unit 100 of the present invention is started, step S10 is first executed, that is, the coil temperature of each turned-on indoor heat exchanger 121 is obtained. The coil temperature of the indoor heat exchanger 121 can be measured by a suitable temperature sensor. Then, step S11 is executed, that is, the coil temperature is compared with a preset temperature threshold. Then, based on the comparison result, it is determined whether the corresponding indoor unit 120 needs to execute the cold wind prevention mode and the speed of the corresponding indoor fan 122 is adjusted (i.e., step S12).

[0033] In one or more embodiments, the preset temperature thresholds include a first preset coil temperature, a second preset coil temperature, and a third preset coil temperature. The first preset coil temperature is equal to the indoor ambient temperature plus a preset temperature difference. The indoor ambient temperature can be measured by a suitable temperature sensor. The preset temperature difference can be 1°C, 2°C, 3°C, or other suitable values. For example, when the indoor ambient temperature is 10°C and the preset temperature difference is 2°C, the first preset coil temperature is equal to 12°C. The second preset coil temperature is greater than the first preset coil temperature, and the third preset coil temperature is greater than the second preset coil temperature. For example, the second preset coil temperature is 30°C and the third preset coil temperature is 32°C. When the measured coil temperature is less than the third preset coil temperature, there is a risk of cold air blowing, and therefore, it is determined that the indoor unit 120 needs to enter the cold air prevention mode. Accordingly, when the measured coil temperature is greater than or equal to the third preset coil temperature, it indicates that the coil temperature is high, and therefore, it is determined that the indoor unit 120 does not need to enter the cold air prevention mode.

[0034] In one or more embodiments, the control method of the present invention implements the following logic to control the indoor fan 122 in different zones: when the coil temperature is less than a first preset coil temperature, the indoor fan 122 is shut down; when the coil temperature is greater than or equal to the first preset coil temperature and less than a second preset coil temperature, the indoor fan 122 is operated at a first preset wind speed; when the coil temperature is greater than or equal to the second preset coil temperature and less than a third preset coil temperature, the indoor fan 122 is operated at a second preset wind speed; and when the coil temperature is greater than or equal to the third preset coil temperature, the indoor fan 122 is operated at a third preset wind speed. The second preset wind speed is greater than the first preset wind speed and less than the third preset wind speed. It should be noted that the first, second, and third preset wind speeds can be adjusted according to actual needs. For example, the first preset wind speed is 650 r / min, the second preset wind speed is 750 r / min, and the third preset wind speed is 850 r / min.

[0035] Figure 4 FIG. 2 is a second flow chart of the first embodiment of the control method for an air-conditioning unit according to the present invention. Figure 4 As shown, in one or more embodiments, when any indoor unit 120 is in cold wind prevention mode, the control method proceeds to step S20, which obtains the actual opening of the throttle component 123 connected to the indoor unit 120. Next, step S21 is executed to determine whether the actual opening is equal to a preset maximum opening. The preset maximum opening of the throttle component 123 can be determined based on the specific model. For example, if the opening range of the throttle component 123 is 200 pls-480 pls, its preset maximum opening is 480 pls. If the judgment result is yes, the on-off valve 124 connected in parallel with the throttle component 123 is controlled to open, thereby distributing more of the high-temperature, high-pressure refrigerant generated by the compressor 111 to the indoor heat exchanger 121 of the indoor unit 120, rapidly raising the coil temperature, shortening the time it takes to execute the cold wind prevention mode, and improving the user experience.

[0036] Continue to see Figure 4 , after step S22 is completed, the control method executes step S23, that is, after a preset time period, the on-off valve 124 is controlled to be closed to prevent obvious unevenness in the distribution of the refrigerant. In one or more embodiments, the preset time period is 5s. Alternatively, the preset time period can also be set to other suitable times that are longer or shorter than 5s. Next, the coil temperature of the indoor heat exchanger 121 is retrieved (step S24). Then, step S25 is executed to compare the retrieved coil temperature with the preset temperature threshold. After step S25 is completed, based on the comparison result, it is re-determined whether the indoor unit 120 needs to execute the anti-cold wind mode and the speed of the indoor fan 122 is adjusted (i.e., step S26) until the indoor unit 120 no longer needs to execute the anti-cold wind mode.

[0037] Continue to see Figure 4 After executing step S21, when the judgment result is no, it means that the actual opening of the throttling component 123 has not reached the preset maximum opening at this time, and then step S27 is executed, that is, the throttling component 123 is controlled to increase the opening. The specific increase value of the opening can be adjusted according to actual needs, for example, 5p ls, etc. After step S27 is completed, the control method proceeds to step S24, that is, re-obtaining the coil temperature of the indoor heat exchanger 121. Then, step S25 is executed to compare the re-obtained coil temperature with the preset temperature threshold. Then, based on the comparison result, it is re-determined whether the indoor unit 120 needs to execute the anti-cold wind mode and the speed of the indoor fan 122 is adjusted (i.e., step S26) until the indoor unit 120 no longer needs to execute the anti-cold wind mode.

[0038] In one or more embodiments, when multiple indoor units 120 are in cold wind prevention mode, the control method of the present invention further performs the following operations: obtaining the coil temperature of each indoor unit 120 in cold wind prevention mode; sorting the coil temperatures in ascending order; and, based on the sorting results, sequentially adjusting the throttling components 123 or on-off valves 124 corresponding to the indoor units 120 in cold wind prevention mode. When multiple indoor units 120 are simultaneously in cold wind prevention mode, by prioritizing adjustment of the indoor units 120 with lower coil temperatures, the duration of their cold wind prevention mode can be significantly shortened, thereby improving the user experience.

[0039] Figure 5 FIG. 1 is a partial flow chart of a second embodiment of the control method for an air-conditioning unit according to the present invention. Figure 5 As shown, in one or more embodiments, before comparing the actual opening with the preset maximum opening of the throttle component 123 (i.e., step S21), the control method of the present invention further performs the following steps: Step S30, comparing the coil temperature corresponding to the indoor unit 120 that does not need to execute the cold wind prevention mode with a fourth preset coil temperature. The fourth preset coil temperature is greater than the third preset coil temperature. For example, the third preset coil temperature is 32°C, and the fourth preset coil temperature is 34°C. When the coil temperature is greater than the fourth preset coil temperature, the corresponding throttle component 123 is controlled to reduce its opening (i.e., step S31). The specific reduction value of the opening can be adjusted according to actual needs, for example, 5 pis. By appropriately reducing the opening of the throttle component 123 of the indoor unit 120, more refrigerant can flow to the indoor unit 120 executing the cold wind prevention mode, thereby further shortening the time it executes the cold wind prevention mode. When the coil temperature is less than or equal to the fourth preset coil temperature, the corresponding throttling component 123 is controlled to maintain an opening (ie, step S32 ) to ensure the stability of the system.

[0040] In one or more embodiments, when there are multiple indoor units 120 that do not need to execute the cold wind prevention mode, the control method of the present invention further performs the following operations: sorting the coil temperatures corresponding to the multiple indoor units 120 that do not need to execute the cold wind prevention mode in descending order; and adjusting the throttling components 123 corresponding to the indoor units 120 that do not need to execute the cold wind prevention mode based on the sorting results. When there are multiple indoor units that do not need to execute the cold wind prevention mode, by prioritizing the adjustment of the throttling components 123 corresponding to the indoor units 120 with higher coil temperatures, single adjustment factors can be reduced, large fluctuations in refrigerant distribution can be avoided, and system stability can be further improved.

[0041] It should be noted that the parts not mentioned in the second embodiment may be configured in the same manner as in the first embodiment and will not be described in detail here.

[0042] The present invention further provides a computer storage medium (not shown in the figure) on which a computer program is stored, and the computer program can be executed by a processor to implement the control method for the air conditioning unit 100 according to any of the above embodiments.

[0043] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A control method for an air conditioning unit, characterized in that: The air conditioning unit includes a plurality of indoor units connected in parallel, each of the indoor units is connected to a throttling component and an on-off valve, the throttling component is connected in parallel with the on-off valve, and the control method includes: When any one of the indoor units is in a cold wind prevention mode, obtaining an actual opening degree of the throttling component connected to the indoor unit; comparing the actual opening with a preset maximum opening of the throttling component; When the actual opening is equal to the preset maximum opening, the on-off valve connected in parallel with the throttling component is controlled to open.

2. The control method for an air conditioning unit according to claim 1, characterized in that: When the actual opening is smaller than the preset maximum opening, the throttling component is controlled to increase the opening.

3. The control method for an air conditioning unit according to claim 1, characterized in that: Each of the indoor units includes an indoor heat exchanger and an indoor fan, and the control method further includes: Obtaining the coil temperature of each powered-on indoor heat exchanger; comparing the coil temperature with a preset temperature threshold value; Based on the comparison result, it is determined whether the corresponding indoor unit needs to execute the cold wind prevention mode and the rotation speed of the corresponding indoor fan is adjusted.

4. The control method for an air conditioning unit according to claim 3, characterized in that: The preset temperature threshold includes: a first preset coil temperature, which is equal to the indoor ambient temperature plus a preset temperature difference; a second predetermined coil temperature, which is greater than the first predetermined coil temperature; a third predetermined coil temperature, which is greater than the second predetermined coil temperature; When the coil temperature is lower than the third preset coil temperature, it is determined that the indoor unit needs to execute the cold wind prevention mode; when the coil temperature is greater than or equal to the third preset coil temperature, it is determined that the indoor unit does not need to execute the cold wind prevention mode; and When the coil temperature is lower than the first preset coil temperature, controlling the indoor fan to stop; When the coil temperature is greater than or equal to the first preset coil temperature and less than the second preset coil temperature, controlling the indoor fan to operate at a first preset wind speed; When the coil temperature is greater than or equal to the second preset coil temperature and less than the third preset coil temperature, controlling the indoor fan to operate at a second preset wind speed; When the coil temperature is greater than or equal to the third preset coil temperature, controlling the indoor fan to operate at a third preset wind speed; The second preset wind speed is greater than the first preset wind speed and less than the third preset wind speed.

5. The control method for an air conditioning unit according to claim 4, characterized in that: Before comparing the actual opening with the preset maximum opening of the throttling component, the control method further includes: comparing the coil temperature corresponding to the indoor unit that does not need to execute the cold wind prevention mode with a fourth preset coil temperature; When the coil temperature is greater than the fourth preset coil temperature, controlling the corresponding throttling component to reduce the opening; When the coil temperature is less than or equal to the fourth preset coil temperature, the corresponding throttling component is controlled to maintain an opening degree, Wherein, the fourth preset coil temperature is greater than the third preset coil temperature.

6. The control method for an air conditioning unit according to claim 5, characterized in that: When there are multiple indoor units that do not need to execute the cold wind prevention mode, the control method further includes: sorting the coil temperatures corresponding to the plurality of indoor units that do not need to execute the cold wind prevention mode in descending order; The throttle components corresponding to the indoor units that do not need to execute the cold wind prevention mode are adjusted in sequence based on the ranking result.

7. The control method for an air conditioning unit according to claim 1, characterized in that: When there are multiple indoor units in the cold wind prevention mode, the control method further includes: Obtaining the coil temperature of each indoor unit in the cold wind prevention mode; sorting the coil temperatures from low to high; The throttling components or the on-off valves corresponding to the indoor units in the cold wind prevention mode are adjusted in sequence based on the sorting results.

8. The control method for an air conditioning unit according to claim 1, characterized in that: After a preset time period, the on-off valve is controlled to close.

9. A computer storage medium, characterized in that A computer program is stored on the computer storage medium, and the computer program can be executed by a processor to implement the control method for the air-conditioning unit according to any one of claims 1 to 8.

10. An air conditioning unit, characterized in that: The control method for an air-conditioning unit according to any one of claims 1 to 8 is executed in the air-conditioning unit, and the air-conditioning unit comprises: Multiple indoor units connected in parallel; a throttling component, each of the throttling components being connected to a corresponding one of the indoor units; and On-off valves, each of the on-off valves is connected in parallel with a corresponding throttling component.

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