Air conditioner and control method of throttling device of air conditioner

Abstract

The invention provides an air conditioner and a control method of a throttling device of the air conditioner, and the control method of the throttling device of the air conditioner comprises the following steps: in a heating mode, obtaining a current condenser inner pipe temperature and a compressor operation frequency; according to the inner tube temperature of the condenser and the operation frequency of the compressor, calculating or looking up a table to obtain an opening lower limit threshold; and the opening degree of the throttling device is adjusted according to the opening degree lower limit threshold value. The control method can solve the problem of abnormal noise caused by small valve port during throttling of the electronic expansion valve during heating of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, in particular to an air conditioner and a control method of a throttling device thereof. Background Art

[0002] With the development of the economy, people's living standards have been improved, the demand for air conditioners has been continuously increasing, and the functions of air conditioners have been improved. The cooling and heating functions alone can no longer meet the needs of customers. Air conditioners are closely related to the lives of customers, and they have higher requirements for air conditioners. They will consider comfort and noise more. The quality of the sound of the indoor unit in the air conditioning system directly affects consumers' evaluation of the product. When the air conditioner is used in a high-load heating environment, the large load of the indoor unit causes high system high pressure, and the low outside ambient temperature causes low low pressure. The huge system pressure difference and high-pressure load, when the valve port of the electronic expansion valve is small, it is easy to have abnormal noise at the outlet of the electronic expansion valve. This noise has low frequency and strong penetration, which can easily cause customer complaints. Summary of the Invention

[0003] The first object of the present invention is to provide a control method for a throttling device of an air conditioner, which can solve the problem of abnormal noise caused by a small valve opening when an electronic expansion valve is throttled during heating of the air conditioner.

[0004] A second object of the present invention is to provide an air conditioner that implements the above control method.

[0005] To achieve the above-mentioned first purpose, the present invention provides a control method for the throttling device of an air conditioner, including: in the heating mode, obtaining the current condenser inner tube temperature and the compressor operating frequency; calculating or looking up the table to obtain the lower limit threshold of the opening according to the condenser inner tube temperature and the compressor operating frequency; and adjusting the opening of the throttling device according to the lower limit threshold of the opening.

[0006] It can be seen from the above scheme that according to the generation principle and occurrence law of the whistling sound, the minimum opening of the electronic expansion valve as a throttling device is controlled in combination with the tube temperature in the condenser, the operating frequency of the compressor, etc. The minimum opening corresponding to different ranges of the tube temperature setting in the condenser is different, and the minimum opening corresponding to different compressor operating frequencies is different. The lower limit threshold of the opening can be obtained by calculation or table lookup, and the opening of the throttling device can be adjusted according to the obtained opening. The present invention avoids abnormal throttling noise caused by excessively small opening and excessive pressure difference at both ends of the valve port when the system is running at high load by reasonably adjusting the minimum opening of the throttling device in the heating mode, thereby improving comfort and enhancing user experience.

[0007] A preferred solution is that the calculation formula for the lower limit threshold of the opening is: P min =a*T+b*F; where P minis the lower limit threshold of the opening, in steps; a and b are preset coefficients; T is the tube temperature in the condenser, in °C; F is the operating frequency of the compressor, in Hz.

[0008] This shows that the minimum throttling opening of the electronic expansion valve is controlled by monitoring the condenser tube temperature and the compressor operating frequency on the condensing side of the refrigeration system. Furthermore, the lower opening threshold is positively correlated with both the compressor operating frequency and the condenser tube temperature. That is, the higher the compressor operating frequency, the larger the lower opening threshold; the lower the compressor frequency, the smaller the lower opening threshold. The higher the condenser tube temperature, the larger the lower opening threshold. Conversely, the lower the condenser tube temperature, the smaller the lower opening threshold. Furthermore, the coefficients a and b can be correlated through experimental testing, and their values can be calculated by summarizing the results of two or more experimental groups.

[0009] A preferred solution is that when the tube temperature in the condenser is greater than or equal to the first preset temperature and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold of the opening is the first preset opening; when the tube temperature in the condenser is greater than or equal to the first preset temperature, the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold of the opening is the second preset opening; when the tube temperature in the condenser is greater than or equal to the first preset temperature, the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold of the opening is the third preset opening; when the tube temperature in the condenser is greater than or equal to the first preset temperature and the compressor operating frequency is less than the third preset frequency, the lower limit threshold of the opening is the fourth preset opening; the first preset opening, the second preset opening, the third preset opening, and the fourth preset opening decrease in sequence.

[0010] It can be seen from this that when the tube temperature in the condenser is greater than or equal to the first preset temperature, it means that the tube temperature in the condenser is high, the system load is large, and the pressure difference is large. The throttling opening control method of the compressor under different frequency ranges is that as the compressor operating frequency decreases, the lower limit threshold of the opening of the electronic expansion valve decreases.

[0011] A further solution is that when the tube temperature in the condenser is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold of the opening is the fifth preset opening; when the tube temperature in the condenser is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold of the opening is the sixth preset opening; when the tube temperature in the condenser is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold of the opening is the seventh preset opening; when the tube temperature in the condenser is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is less than the third preset frequency, the lower limit threshold of the opening is the eighth preset opening; the fifth preset opening, the sixth preset opening, the seventh preset opening, and the eighth preset opening decrease in sequence.

[0012] It can be seen from this that when the tube temperature in the condenser is greater than or equal to the second preset temperature and less than the first preset temperature, it means that the tube temperature in the condenser is high, the system load is large, and the pressure difference is large. The throttling opening control method of the compressor under different frequency ranges is that as the compressor operating frequency decreases, the lower limit threshold of the opening of the electronic expansion valve decreases.

[0013] A further solution is that each preset opening satisfies at least one of the following: the fifth preset opening is equal to the second preset opening; or the sixth preset opening is equal to the third preset opening; or the seventh preset opening is equal to the fourth preset opening.

[0014] A preferred solution is that when the tube temperature in the condenser is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold of the opening is the ninth preset opening; when the tube temperature in the condenser is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold of the opening is the tenth preset opening; when the tube temperature in the condenser is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold of the opening is the eleventh preset opening; when the tube temperature in the condenser is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is less than the third preset frequency, the lower limit threshold of the opening is the twelfth preset opening; the ninth preset opening, the tenth preset opening, the eleventh preset opening, and the twelfth preset opening decrease in sequence.

[0015] It can be seen from this that when the tube temperature in the condenser is greater than or equal to the third preset temperature and less than the second preset temperature, it means that the tube temperature in the condenser is low, the system load is average, the pressure difference is average, and the throttling opening control method of the compressor under different frequency ranges is that as the compressor operating frequency decreases, the lower limit threshold of the opening of the electronic expansion valve decreases.

[0016] A further solution is that each preset opening degree satisfies at least one of the following: the ninth preset opening degree is equal to the sixth preset opening degree; or the tenth preset opening degree is equal to the seventh preset opening degree; or the eleventh preset opening degree is equal to the eighth preset opening degree.

[0017] A further solution is that when the tube temperature in the condenser is less than the third preset temperature and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold of the opening is the thirteenth preset opening; when the tube temperature in the condenser is less than the third preset temperature, the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold of the opening is the fourteenth preset opening; when the tube temperature in the condenser is less than the third preset temperature, the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold of the opening is the fifteenth preset opening; when the tube temperature in the condenser is less than the third preset temperature and the compressor operating frequency is less than the third preset frequency, the lower limit threshold of the opening is the sixteenth preset opening; the thirteenth preset opening, the fourteenth preset opening, the fifteenth preset opening and the sixteenth preset opening decrease in sequence.

[0018] It can be seen from this that when the tube temperature in the condenser is lower than the third preset temperature, it indicates that the tube temperature in the condenser is low, the system load is small, and the pressure difference is small. The throttling opening control mode of the compressor under different frequency ranges is that as the operating frequency of the compressor decreases, the lower limit threshold of the opening of the electronic expansion valve decreases.

[0019] A further solution is that each preset opening satisfies at least one of the following: the thirteenth preset opening is equal to the tenth preset opening; or the fourteenth preset opening is equal to the eleventh preset opening; or the fifteenth preset opening is equal to the twelfth preset opening.

[0020] To achieve the above second objective, the present invention provides an air conditioner, which includes a processor, and the processor is configured to implement the control method of the throttling device of the air conditioner when executing a program stored in a memory. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of an embodiment of a method for controlling a throttling device of an air conditioner according to the present invention.

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0023] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention, its application, or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully convey the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, the composition of materials, numerical expressions, and numerical values set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0024] The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are simply used to distinguish different parts. Terms such as "include" or "comprising" mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0025] In the present invention, when a specific device is described as being located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When a specific device is described as being connected to another device, the specific device may be directly connected to the other device without an intervening device, or may be directly connected to the other device but with an intervening device.

[0026] All terms (including technical or scientific terms) used in the present invention have the same meaning as those understood by ordinary technicians in the field, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having the meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0027] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0028] The air conditioner of this embodiment includes a compressor, a condenser, an evaporator, and a processor. The compressor, condenser, and evaporator constitute a refrigerant circulation system. An electronic expansion valve serving as a throttling device is provided in the pipeline between the condenser and the evaporator. The processor is configured to execute a program stored in a memory to implement the following method for controlling the throttling device of the air conditioner.

[0029] See also Figure 1, a method for controlling a throttling device of an air conditioner comprises the following steps:

[0030] First, execute step S1 to obtain the current condenser inner tube temperature and compressor operating frequency in the heating mode.

[0031] Next, step S2 is executed to calculate or look up the lower limit threshold of the opening degree, ie, the minimum opening degree of the throttling device, according to the tube temperature in the condenser and the operating frequency of the compressor.

[0032] Finally, step S3 is executed to adjust the opening of the throttling device according to the lower opening threshold value obtained in step S2.

[0033] In step S2, the lower limit threshold of the opening can be calculated by the following formula:

[0034] P min =a*T+b*F;

[0035] Among them, P min is the lower limit threshold of the opening, the unit is step;

[0036] a and b are preset coefficients;

[0037] T is the tube temperature in the condenser, in °C;

[0038] F is the operating frequency of the compressor, in Hz.

[0039] Alternatively, in step S2, the lower opening threshold value may also be obtained by looking up a table.

[0040] When the tube temperature in the condenser is greater than or equal to the first preset temperature and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold value of the opening is the first preset opening; when the tube temperature in the condenser is greater than or equal to the first preset temperature, the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold value of the opening is the second preset opening; when the tube temperature in the condenser is greater than or equal to the first preset temperature, the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold value of the opening is the third preset opening; when the tube temperature in the condenser is greater than or equal to the first preset temperature and the compressor operating frequency is less than the third preset frequency, the lower limit threshold value of the opening is the fourth preset opening; the first preset opening, the second preset opening, the third preset opening, and the fourth preset opening decrease in sequence.

[0041] When the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold value of the opening degree is the fifth preset opening degree; when the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold value of the opening degree is the sixth preset opening degree; when the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold value of the opening degree is the seventh preset opening degree; when the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is less than the third preset frequency, the lower limit threshold value of the opening degree is the eighth preset opening degree. The fifth preset opening degree, the sixth preset opening degree, the seventh preset opening degree, and the eighth preset opening degree decrease in sequence. The values of the fifth preset opening, the sixth preset opening and the seventh preset opening satisfy at least one of the following: the fifth preset opening is equal to the second preset opening; or the sixth preset opening is equal to the third preset opening; or the seventh preset opening is equal to the fourth preset opening.

[0042] When the condenser tube temperature is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the first preset frequency, the lower limit threshold value of the opening degree is the ninth preset opening degree; when the condenser tube temperature is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold value of the opening degree is the tenth preset opening degree; when the condenser tube temperature is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold value of the opening degree is the eleventh preset opening degree; when the condenser tube temperature is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is less than the third preset frequency, the lower limit threshold value of the opening degree is the twelfth preset opening degree. The ninth preset opening degree, the tenth preset opening degree, the eleventh preset opening degree, and the twelfth preset opening degree decrease in order. The values of the ninth preset opening, the tenth preset opening and the eleventh preset opening satisfy at least one of the following: the ninth preset opening is equal to the sixth preset opening; or the tenth preset opening is equal to the seventh preset opening; or the eleventh preset opening is equal to the eighth preset opening.

[0043] When the condenser tube temperature is less than the third preset temperature and the compressor operating frequency is greater than or equal to the first preset frequency, the lower opening threshold is the thirteenth preset opening. When the condenser tube temperature is less than the third preset temperature and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the lower opening threshold is the fourteenth preset opening. When the condenser tube temperature is less than the third preset temperature and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the lower opening threshold is the fifteenth preset opening. When the condenser tube temperature is less than the third preset temperature and the compressor operating frequency is less than the third preset frequency, the lower opening threshold is the sixteenth preset opening. The thirteenth, fourteenth, fifteenth, and sixteenth preset openings decrease in sequence. The values of the thirteenth, fourteenth, and fifteenth preset openings satisfy at least one of the following: the thirteenth preset opening is equal to the tenth preset opening; or the fourteenth preset opening is equal to the eleventh preset opening; or the fifteenth preset opening is equal to the twelfth preset opening.

[0044] For different models of air conditioners, the preset frequency, preset temperature, and preset opening can take different values. Optionally, in this embodiment, the first preset temperature is 50°C, the second preset temperature is 45°C, the third preset temperature is 40°C, the first preset frequency is 100Hz, the second preset frequency is 80Hz, and the third preset frequency is 60Hz. The first preset opening is 150 steps, the second and fifth preset openings are both 130 steps, the third, sixth, and ninth preset openings are all 120 steps, the fourth, seventh, tenth, and thirteenth preset openings are all 100 steps, the eighth, eleventh, and fourteenth preset openings are all 90 steps, the twelfth and fifteenth preset openings are both 80 steps, and the sixteenth preset opening is 70 steps. In this embodiment, the relationship between the condenser tube temperature, the compressor operating frequency, and the lower limit threshold of the opening is shown in Tables 1 to 4.

[0045] Table 1 Compressor operating frequency F and opening lower limit threshold P when the tube temperature Tn in the condenser tube is ≥ 50℃ min Relationship table

[0046]

[0047]

[0048] Table 2 Compressor operating frequency F and opening lower limit threshold P when the temperature inside the condenser is 45℃≤Tn<50℃ min Relationship table

[0049]

[0050] Table 3 Compressor operating frequency F and opening lower limit threshold P when the temperature inside the condenser is 40℃≤Tn<45℃ min Relationship table

[0051]

[0052] Table 4 Compressor operating frequency F and opening lower limit threshold P when the condenser tube temperature Tn is less than 40℃ min Relationship table

[0053]

[0054]

[0055] As can be seen from the above table, when the tube temperature Tn in the condenser satisfies Tn ≥ 50°C, it means that the tube temperature in the condenser is high, the system load is large, and the pressure difference is large. The throttling opening control mode under different frequency ranges of the compressor is shown in Table 1. As the operating frequency of the compressor decreases, the lower limit threshold of the opening of the electronic expansion valve decreases.

[0056] When the condenser tube temperature Tn satisfies 45℃≤Tn<50℃, it means that the condenser tube temperature is high, the system load is large, and the pressure difference is large. The throttling opening control mode under different compressor frequency ranges is shown in Table 2. As the compressor operating frequency decreases, the lower limit threshold of the electronic expansion valve opening decreases.

[0057] When the condenser tube temperature Tn satisfies 40℃≤Tn<45℃, it means that the condenser tube temperature is low, the system load is normal, and the pressure difference is normal. The throttling opening control mode under different compressor frequency ranges is shown in Table 3. As the compressor operating frequency decreases, the lower limit threshold of the electronic expansion valve opening decreases.

[0058] When the condenser tube temperature Tn satisfies Tn<40℃, it means that the condenser tube temperature is low, the system load is small, and the pressure difference is small. The throttling opening control mode under different compressor frequency ranges is shown in Table 4. As the compressor operating frequency decreases, the lower limit threshold of the electronic expansion valve opening decreases.

[0059] According to the control method of the air conditioner's throttling device, the noise experience results are as follows:

[0060]

[0061] As can be seen from the above table, by adopting the control method of the throttling device of the present invention to adjust the throttling device, the noise experience is better.

[0062] According to the generation principle and occurrence law of the whistling sound, the minimum opening of the electronic expansion valve is controlled in combination with the temperature of the tube in the condenser, the operating frequency of the compressor, etc. The minimum opening corresponding to different ranges of the temperature setting of the tube in the condenser is different, and the minimum opening corresponding to different operating frequencies of the compressor is different. The lower limit threshold of the opening can be obtained by calculation or table lookup, and the opening of the throttling device can be adjusted according to the obtained opening. The lower limit threshold of the opening is positively correlated with the operating frequency of the compressor and the temperature of the tube in the condenser, that is, the higher the operating frequency of the compressor, the larger the lower limit threshold of the opening; the lower the frequency of the compressor, the smaller the lower limit threshold of the opening, the higher the temperature of the tube in the condenser, the larger the lower limit threshold of the opening, and conversely, the lower the temperature of the tube in the condenser, the smaller the lower limit threshold of the opening. The present invention avoids the situation where the opening is too small and the pressure difference between the two ends of the valve port is too large when the system is running at high load by reasonably adjusting the minimum opening of the throttling device in the heating mode, thereby avoiding abnormal throttling noise, improving comfort, and enhancing user experience.

[0063] Finally, it should be emphasized that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for controlling a throttling device of an air conditioner, characterized in that: include: In heating mode, obtain the current condenser inner tube temperature and compressor operating frequency; Calculate or look up a table to obtain the lower limit threshold of the opening degree according to the inner tube temperature of the condenser and the operating frequency of the compressor; The opening of the throttling device is adjusted according to the lower opening threshold.

2. The control method according to claim 1, wherein: The calculation formula of the lower limit threshold of the opening is: min =a*T+b*F; Among them, P min is the lower limit threshold of the opening, the unit is step; a and b are preset coefficients; T is the tube temperature in the condenser, in °C; F is the operating frequency of the compressor, in Hz.

3. The control method according to claim 1, wherein: When the temperature of the tube in the condenser is greater than or equal to the first preset temperature and the operating frequency of the compressor is greater than or equal to the first preset frequency, the lower limit threshold of the opening degree is set to the first preset opening degree; When the temperature of the tube in the condenser is greater than or equal to the first preset temperature, and the operating frequency of the compressor is greater than or equal to the second preset frequency and less than the first preset frequency, the lower limit threshold of the opening degree is set to the second preset opening degree; When the temperature of the tube in the condenser is greater than or equal to the first preset temperature, and the operating frequency of the compressor is greater than or equal to the third preset frequency and less than the second preset frequency, the lower limit threshold of the opening degree is set to the third preset opening degree; When the temperature of the tube in the condenser is greater than or equal to the first preset temperature and the operating frequency of the compressor is less than the third preset frequency, the lower limit threshold of the opening degree is set to a fourth preset opening degree; The first preset opening, the second preset opening, the third preset opening, and the fourth preset opening decrease in sequence.

4. The control method according to claim 3, wherein: When the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the first preset frequency, the opening lower limit threshold is set to a fifth preset opening; When the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the opening lower limit threshold is set to a sixth preset opening; When the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the opening lower limit threshold is set to the seventh preset opening; When the temperature of the condenser tube is greater than or equal to the second preset temperature and less than the first preset temperature, and the compressor operating frequency is less than the third preset frequency, the opening lower limit threshold is set to an eighth preset opening; The fifth preset opening, the sixth preset opening, the seventh preset opening, and the eighth preset opening decrease in sequence.

5. The control method according to claim 4, characterized in that: Each preset opening satisfies at least one of the following: The fifth preset opening degree is equal to the second preset opening degree; or The sixth preset opening degree is equal to the third preset opening degree; or The seventh preset opening degree is equal to the fourth preset opening degree.

6. The control method according to claim 4 or 5, characterized in that: When the temperature of the condenser tube is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the first preset frequency, the opening lower limit threshold is set to a ninth preset opening; When the temperature of the condenser tube is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the second preset frequency and less than the first preset frequency, the opening lower limit threshold is set to the tenth preset opening; When the temperature of the condenser tube is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is greater than or equal to the third preset frequency and less than the second preset frequency, the opening lower limit threshold is set to the eleventh preset opening; When the temperature of the condenser tube is greater than or equal to the third preset temperature and less than the second preset temperature, and the compressor operating frequency is less than the third preset frequency, the opening lower limit threshold is set to the twelfth preset opening; The ninth preset opening, the tenth preset opening, the eleventh preset opening, and the twelfth preset opening decrease in sequence.

7. The control method according to claim 6, characterized in that: Each preset opening satisfies at least one of the following: The ninth preset opening degree is equal to the sixth preset opening degree; or The tenth preset opening degree is equal to the seventh preset opening degree; or The eleventh preset opening degree is equal to the eighth preset opening degree.

8. The control method according to claim 6, wherein: When the temperature of the tube in the condenser is lower than the third preset temperature and the operating frequency of the compressor is greater than or equal to the first preset frequency, the lower limit threshold of the opening degree is set to the thirteenth preset opening degree; When the temperature of the tube in the condenser is lower than the third preset temperature and the operating frequency of the compressor is higher than or equal to the second preset frequency and lower than the first preset frequency, the lower limit threshold of the opening degree is set to the fourteenth preset opening degree; When the temperature of the tube in the condenser is lower than the third preset temperature and the operating frequency of the compressor is greater than or equal to the third preset frequency and lower than the second preset frequency, the lower limit threshold of the opening degree is set to the fifteenth preset opening degree; When the temperature of the tube in the condenser is lower than the third preset temperature and the operating frequency of the compressor is lower than the third preset frequency, the lower limit threshold of the opening degree is set to the sixteenth preset opening degree; The thirteenth preset opening degree, the fourteenth preset opening degree, the fifteenth preset opening degree, and the sixteenth preset opening degree decrease in sequence.

9. The control method according to claim 8, characterized in that: Each preset opening satisfies at least one of the following: The thirteenth preset opening degree is equal to the tenth preset opening degree; or The fourteenth preset opening degree is equal to the eleventh preset opening degree; or The fifteenth preset opening degree is equal to the twelfth preset opening degree.

10. An air conditioner, characterized in that: The air conditioner includes a processor, and the processor is configured to implement the method for controlling a throttling device of the air conditioner according to any one of claims 1 to 9 when executing a program stored in a memory.

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