Pretreatment air unit and control method thereof

Abstract

The invention discloses a pretreatment air unit and a control method thereof, and the control method comprises the following steps: obtaining basic information to construct a single-air-duct adjusting table and a double-air-duct adjusting table, and the single-air-duct adjusting table and the double-air-duct adjusting table respectively comprise a plurality of adjusting gears and actions corresponding to the adjusting gears; according to the air pipe operation mode, the starting gear of the pretreatment air unit is determined on the basis of the calculated real-time inlet and outlet air temperature difference and the air pipe adjusting table corresponding to the air pipe operation mode, and then the working state of the refrigeration mechanism is adjusted on the basis of the real-time outlet air temperature and the air pipe adjusting table corresponding to the air pipe operation mode; according to the control method disclosed by the invention, the starting gear of the pretreatment air unit is determined based on the real-time inlet and outlet air temperature difference, and then the working state of the refrigeration mechanism is adjusted based on the real-time outlet air temperature, so that normal starting of the pretreatment air unit and normal operation of the refrigeration mechanism can be ensured; and the problems of too low air outlet temperature and low-pressure jump stop of the compressor caused by starting too many compressors in transition seasons are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft ground air-conditioning units, and particularly to a pre-treated air unit and its control method. Background Art

[0002] An aircraft ground air-conditioning unit, also known as a pre-treated air unit (PCA), is an essential special equipment in airport ground services, responsible for regulating the air temperature and humidity inside the aircraft cabin; in the "Blue Sky Defense War", the PCA plays a crucial role. It can effectively reduce the dependence on the auxiliary power unit engine (APU), thereby reducing noise and emissions and protecting the environment.

[0003] Although the PCA has significant advantages in aviation ground services, most of the current PCA products on the market still have some technical limitations; specifically, the currently widely used PCA is usually equipped with a fixed-frequency compressor and multiple refrigeration systems, and often uses the hot gas bypass defrosting technology for defrosting or energy regulation; however, in the actual operation process, due to the imperfect control system, especially in the transitional season or when only one duct of a dual-duct unit is opened, a series of problems are likely to occur; for example, the compressor may frequently start and stop due to low pressure, and the hot gas bypass system may be continuously activated, resulting in significant fluctuations in the outlet air temperature; this temperature instability not only reduces the operating efficiency and effect of the unit, leading to large fluctuations in the outlet air temperature, but also significantly affects the comfort of passengers.

[0004] It can be seen that the existing technology still needs to be improved. Summary of the Invention

[0005] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide a control method for a pre-treated air unit, which can ensure the normal startup of the pre-treated air unit and the normal operation of the refrigeration mechanism, and avoid the problems of too low outlet air temperature and compressor low-pressure trip caused by starting too many compressors in the transitional season.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A control method for a pre-treatment air unit, comprising the steps of: obtaining basic information, constructing a single-duct adjustment table and a dual-duct adjustment table based on the obtained basic information, the single-duct adjustment table and the dual-duct adjustment table respectively including a plurality of adjustment gears and actions corresponding to the adjustment gears; when the air supply fan of the pre-treatment air unit starts, obtaining preset temperature information, real-time inlet air temperature and real-time duct operation mode, calculating the real-time temperature difference between the inlet and outlet based on the real-time inlet air temperature and the preset temperature information; when the real-time duct operation mode is dual-duct operation, determining the starting gear of the pre-treatment air unit based on the real-time temperature difference between the inlet and outlet and the dual-duct adjustment table, and starting the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, then obtaining the real-time outlet air temperature, and adjusting the working state of the refrigeration mechanism according to the comparison result between the real-time outlet air temperature and the preset outlet air temperature information; when the real-time duct operation mode is single-duct operation, determining the starting gear of the pre-treatment air unit based on the real-time temperature difference between the inlet and outlet and the single-duct adjustment table, and starting the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, then obtaining the real-time outlet air temperature, and adjusting the working state of the refrigeration mechanism according to the comparison result between the real-time outlet air temperature and the preset outlet air temperature information.

[0008] In the control method of the pre-treatment air unit, the obtaining of the basic information specifically includes: obtaining basic information, the basic information including the operation parameters of the refrigeration mechanism and the preset gear temperature difference, the operation parameters of the refrigeration mechanism including the refrigeration type and the refrigeration power, the preset gear temperature difference being 2°C - 4°C; confirming the single-duct temperature adjustment range and the dual-duct temperature adjustment range based on the operation parameters of the refrigeration mechanism.

[0009] In the control method of the pre-treatment air unit, the constructing of the single-duct adjustment table and the dual-duct adjustment table based on the obtained basic information, the single-duct adjustment table and the dual-duct adjustment table respectively including a plurality of adjustment gears and actions corresponding to the adjustment gears, specifically includes: constructing a single-duct adjustment table based on the single-duct adjustment range and the preset gear temperature difference, the single-duct adjustment table including a plurality of single-duct adjustment gears and actions corresponding to the single-duct adjustment gears, the single-duct adjustment gears including the adjustment gears corresponding to the real-time temperature difference between the inlet and outlet; constructing a dual-duct adjustment table based on the dual-duct adjustment range and the preset gear temperature difference, the dual-duct adjustment table including a plurality of dual-duct adjustment gears and actions corresponding to the dual-duct adjustment gears, the dual-duct adjustment gears including the adjustment gears corresponding to the real-time temperature difference between the inlet and outlet.

[0010] In the control method of the pre-treatment air unit, when the supply fan of the pre-treatment air unit starts, obtain the preset temperature information, the real-time inlet air temperature, and the real-time air duct operation mode, and calculate the real-time inlet and outlet air temperature difference based on the real-time inlet air temperature and the preset temperature information. Specifically, it includes: obtaining the preset temperature information, where the preset temperature information includes the preset outlet air temperature and the preset fan temperature rise; when the supply fan of the pre-treatment air unit starts, obtaining the real-time inlet air temperature and the real-time air duct operation mode; adjusting the preset outlet air temperature based on the real-time inlet air temperature to obtain the adjusted outlet air temperature, and adjusting the preset fan temperature rise based on the adjusted inlet air temperature and the real-time air duct operation mode to obtain the adjusted fan temperature rise; calculating the real-time inlet and outlet air temperature difference based on the real-time inlet air temperature, the adjusted outlet air temperature, and the adjusted fan temperature rise.

[0011] In the control method of the pre-treatment air unit, the refrigeration mechanism includes a first refrigeration system, a second refrigeration system, a third refrigeration system, a fourth refrigeration system, and a fifth refrigeration system. The power of the fixed-frequency compressors of the first refrigeration system, the second refrigeration system, and the third refrigeration system is 25HP, and the power of the fixed-frequency compressors of the fourth refrigeration system and the fifth refrigeration system is 10HP. When the real-time air duct operation mode is dual air duct operation, determine the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference and the dual air duct adjustment table, and start the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear. Specifically, it includes: when 2°C ≤ real-time inlet and outlet air temperature difference < 12°C, start the fifth refrigeration system; when 12°C ≤ real-time inlet and outlet air temperature difference < 16°C, start the fourth refrigeration system and the fifth refrigeration system; when 16°C ≤ real-time inlet and outlet air temperature difference < 18°C, start the third refrigeration system; when 18°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the third refrigeration system and the fifth refrigeration system; when 22°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third refrigeration system, the fourth refrigeration system, and the fifth refrigeration system; when 26°C ≤ real-time inlet and outlet air temperature difference < 28°C, start the first refrigeration system and the third refrigeration system; when 28°C ≤ real-time inlet and outlet air temperature difference < 32°C, start the first refrigeration system, the third refrigeration system, and the fifth refrigeration system; when 32°C ≤ real-time inlet and outlet air temperature difference < 36°C, start the first refrigeration system, the third refrigeration system, the fourth refrigeration system, and the fifth refrigeration system; when 36°C ≤ real-time inlet and outlet air temperature difference < 38°C, start the first refrigeration system, the second refrigeration system, and the third refrigeration system; when 38°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, and the fourth refrigeration system; when the real-time inlet and outlet air temperature difference ≥ 42°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, the fourth refrigeration system, and the fifth refrigeration system.

[0012] In the control method of the pre-treatment air unit, when the real-time air duct operation mode is single air duct operation, the starting gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the single air duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined starting gear. Specifically, it includes: when 2°C ≤ real-time inlet and outlet air temperature difference < 14°C, start the fifth refrigeration system; when 14°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the fourth refrigeration system and the fifth refrigeration system; when 22°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third refrigeration system; when 26°C ≤ real-time inlet and outlet air temperature difference < 34°C, start the third refrigeration system and the fifth refrigeration system; when 34°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system; when 42°C ≤ real-time inlet and outlet air temperature difference < 46°C, start the first refrigeration system and the third refrigeration system; when 46°C ≤ real-time inlet and outlet air temperature difference < 54°C, start the first refrigeration system, the third refrigeration system and the fifth refrigeration system; when 54°C ≤ real-time inlet and outlet air temperature difference < 62°C, start the first refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system; when 62°C ≤ real-time inlet and outlet air temperature difference < 66°C, start the first refrigeration system, the second refrigeration system and the third refrigeration system; when 66°C ≤ real-time inlet and outlet air temperature difference < 74°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system and the fourth refrigeration system; when the real-time inlet and outlet air temperature difference ≥ 74°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system.

[0013] In the control method of the pre-treatment air unit, the refrigeration mechanism includes a first refrigeration system, a second refrigeration system, a third refrigeration system and a variable-frequency refrigeration system. The power of the fixed-frequency compressors of the first refrigeration system, the second refrigeration system and the third refrigeration system is 25HP, and the refrigeration capacity of the variable-frequency refrigeration system is the same as that of a fixed-frequency compressor with a power of 20HP; when the real-time air duct operation mode is double air duct operation, the starting gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the double air duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined starting gear. Specifically, it includes: when 2°C ≤ real-time inlet and outlet air temperature difference < 16°C, start the variable-frequency refrigeration system; when 16°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third refrigeration system and the variable-frequency refrigeration system; when 26°C ≤ real-time inlet and outlet air temperature difference < 36°C, start the first refrigeration system, the third refrigeration system and the variable-frequency refrigeration system; when the real-time inlet and outlet air temperature difference ≥ 36°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system and the variable-frequency refrigeration system.

[0014] In the control method of the pre-treatment air unit, when the real-time air duct operation mode is single air duct operation, the starting gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the single air duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined starting gear. Specifically, it includes: when 2°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the variable frequency refrigeration system; when 22°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the third refrigeration system and the variable frequency refrigeration system; when 42°C ≤ real-time inlet and outlet air temperature difference < 62°C, start the first refrigeration system, the third refrigeration system and the variable frequency refrigeration system; when the real-time inlet and outlet air temperature difference ≥ 62°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system and the variable frequency refrigeration system.

[0015] In the control method of the pre-treatment air unit, the refrigeration mechanism includes a first variable frequency system, a second variable frequency system, a third variable frequency system and a fourth variable frequency system with the same refrigeration capacity; when the real-time air duct operation mode is double air duct operation, the starting gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the double air duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined starting gear. Specifically, it includes: when 2°C ≤ real-time inlet and outlet air temperature difference < 16°C, start the fourth variable frequency refrigeration system; when 16°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third variable frequency system and the fourth variable frequency refrigeration system; when 26°C ≤ real-time inlet and outlet air temperature difference < 36°C, start the second variable frequency refrigeration system, the third variable frequency system and the fourth variable frequency refrigeration system; when the real-time inlet and outlet air temperature difference ≥ 36°C, start the first variable frequency refrigeration system, the second variable frequency refrigeration system, the third variable frequency system and the fourth variable frequency refrigeration system.

[0016] The present invention also correspondingly provides a pre-treatment air unit, and the pre-treatment air unit realizes work control by using any one of the above control methods; the pre-treatment air unit includes a housing, an air inlet and an air outlet are provided on the housing, a control device and a air supply mechanism and a refrigeration mechanism which are electrically connected to the control device are arranged in the housing; the air supply mechanism is used to convey the pre-treated air from the air inlet to the air outlet, and the refrigeration mechanism is used to realize the pre-treatment of the air.

[0017] Beneficial effects:

[0018] The present invention provides a control method for a pre-treatment air unit, which determines the starting gear of the pre-treatment air unit based on the real-time temperature difference between the inlet and outlet air, and adjusts the working state of the refrigeration mechanism based on the real-time outlet air temperature, ensuring the normal start-up of the pre-treatment air unit and the normal operation of the refrigeration mechanism, avoiding the problem that the outlet air temperature is too low due to excessive compressor start-up in the transition season, and even causing the compressor to trip due to low pressure. At the same time, it can prevent the compressor from being quickly shut down after being fully opened, thus avoiding excessive temperature fluctuations. In addition, for the single-duct operation mode and the double-duct operation mode, corresponding adjustment gears are set respectively, which can completely solve the problem of excessive compressor start-up in the transition season. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the first logic flow chart of the control method provided by the present invention;

[0020] Figure 2 It is the second logic flow chart of the control method provided by the present invention;

[0021] Figure 3 It is the third logic flow chart of the control method provided by the present invention;

[0022] Figure 4 It is the fourth logic flow chart of the control method provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present invention provides a pre-treatment air unit and its control method. To make the purpose, technical solution and effect of the present invention clearer and more definite, the following examples are given with reference to the accompanying drawings to further elaborate the present invention in detail.

[0024] In the description of the present invention, it should be understood that terms such as "installation" and "connection" should be understood in a broad sense. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0025] Please refer to Figure 1 , the present invention provides a control method for a pre-treatment air unit, including the steps of:

[0026] 101. Obtain basic information, and construct a single-duct adjustment table and a double-duct adjustment table based on the obtained basic information. The single-duct adjustment table and the double-duct adjustment table respectively include multiple adjustment gears and actions corresponding to the adjustment gears;

[0027] 102. When the blower of the pre-treatment air unit starts, obtain the preset temperature information, the real-time inlet air temperature and the real-time duct operation mode, and calculate the real-time temperature difference between the inlet and outlet air based on the real-time inlet air temperature and the preset temperature information;

[0028] 103. When the real-time air duct operation mode is dual air duct operation, determine the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference and the dual air duct adjustment table, start the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, then obtain the real-time outlet air temperature, and adjust the working state of the refrigeration mechanism according to the comparison result between the real-time outlet air temperature and the preset outlet air temperature information;

[0029] 104. When the real-time air duct operation mode is single air duct operation, determine the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference and the single air duct adjustment table, start the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, then obtain the real-time outlet air temperature, and adjust the working state of the refrigeration mechanism according to the comparison result between the real-time outlet air temperature and the preset outlet air temperature information.

[0030] The present application discloses a control method for a pre-treatment air unit, which determines the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference, and adjusts the working state of the refrigeration mechanism according to the comparison result between the real-time outlet air temperature and the preset outlet air temperature information, which can ensure the normal start of the pre-treatment air unit and ensure the normal operation of the refrigeration mechanism, prevent the problem of too low outlet air temperature caused by over-starting the compressor during the season alternation period. At the same time, it can also prevent the compressor from suddenly shutting down after full-load operation, thus avoiding other problems that may be caused by excessive temperature fluctuations; in addition, for the two different operation modes of single air duct and dual air duct, the corresponding adjustment gears are set respectively, which can completely solve the problem of over-starting the compressor during the season alternation period, and ensure the stable operation of the pre-treatment air unit and the optimization of energy efficiency.

[0031] Further, please refer to Figure 2 , the obtaining of the basic information specifically includes:

[0032] 201. Obtain basic information, where the basic information includes the operating parameters of the refrigeration mechanism and the preset gear temperature difference, the operating parameters of the refrigeration mechanism, and the preset gear temperature difference is 2°C - 4°C;

[0033] In this embodiment, in order to ensure the stability of the supply air temperature during the gear switching process and avoid large temperature fluctuations, the difference between the temperature differences of each gear is set to be approximately between 2°C and 4°C, which helps to maintain a relatively stable supply air temperature, thereby improving the operating efficiency and comfort of the pre-treatment air unit.

[0034] 202. Confirm the single air duct temperature adjustment range and the dual air duct temperature adjustment range based on the operating parameters of the refrigeration mechanism;

[0035] In this embodiment, for the single-duct operation mode, the determination of the temperature adjustment range needs to consider the set rated operating temperature, ambient temperature, and safety margin. Based on the foregoing factors, the single-duct temperature adjustment range can be set as follows: Minimum temperature = equipment rated minimum operating temperature - safety margin; Maximum temperature = equipment rated maximum operating temperature + safety margin. For the double-duct operation mode, the determination of the temperature adjustment range needs to consider the set rated operating temperature, ambient temperature, safety margin, and thermal efficiency. Based on the foregoing factors, the double-duct temperature adjustment range can be set as follows: Minimum temperature = equipment rated minimum operating temperature - safety margin; Maximum temperature = equipment rated maximum operating temperature + safety margin. At the same time, it is necessary to ensure that the temperature difference between the two ducts is within the range allowed by the system design to ensure thermal efficiency and the normal operation of the unit.

[0036] Further, please refer to Figure 3 , and construct a single-duct adjustment table and a double-duct adjustment table based on the obtained basic information. The single-duct adjustment table and the double-duct adjustment table respectively include multiple adjustment gears and actions corresponding to the adjustment gears, specifically including:

[0037] 301. Construct a single-duct adjustment table based on the single-duct adjustment range and the preset gear temperature difference. The single-duct adjustment table includes multiple single-duct adjustment gears and actions corresponding to the single-duct adjustment gears. The single-duct adjustment gears include adjustment gears corresponding to the real-time inlet and outlet air temperature difference.

[0038] 302. Construct a double-duct adjustment table based on the double-duct adjustment range and the preset gear temperature difference. The double-duct adjustment table includes multiple double-duct adjustment gears and actions corresponding to the double-duct adjustment gears. The double-duct adjustment gears include adjustment gears corresponding to the real-time inlet and outlet air temperature difference.

[0039] Further, please refer to Figure 4 , when the supply fan of the pre-treatment air unit starts, obtain the preset temperature information, real-time inlet air temperature, and real-time duct operation mode, and calculate the real-time inlet and outlet air temperature difference based on the real-time inlet air temperature and the preset temperature information, specifically including:

[0040] 401. Obtain the preset temperature information, and the preset temperature information includes the preset outlet air temperature and the preset fan temperature rise.

[0041] 402. When the supply fan of the pre-treatment air unit starts, obtain the real-time inlet air temperature and the real-time duct operation mode.

[0042] 403. Adjust the preset outlet air temperature based on the real-time inlet air temperature to obtain the adjusted outlet air temperature, and adjust the preset fan temperature rise based on the adjusted inlet air temperature and the real-time duct operation mode to obtain the adjusted fan temperature rise.

[0043] In this embodiment, the preset air outlet temperature is automatically or manually adjusted according to a preset logic or algorithm. When the automatic adjustment method is adopted, a function or rule related to the inlet air temperature can be preset. For example, when the real-time inlet air temperature rises, the adjusted air outlet temperature also rises accordingly to ensure that the refrigeration mechanism operates at the correct gear. Then, according to the single or double air ducts and the inlet air temperature, the predicted fan temperature rise is automatically adjusted. For a single air duct system, the fan temperature rise may be relatively fixed, while for a double air duct system, the preset fan temperature rise can be dynamically adjusted according to the change in the adjusted inlet air temperature to achieve more accurate temperature control.

[0044] 404. Calculate the real-time inlet and outlet air temperature difference based on the real-time inlet air temperature, the adjusted air outlet temperature, and the adjusted fan temperature rise.

[0045] In this embodiment, the real-time inlet and outlet air temperature difference is calculated according to the formula: real-time inlet and outlet air temperature difference = real-time inlet air temperature + adjusted fan temperature rise - adjusted air outlet temperature. The calculated real-time inlet and outlet air temperature difference is used to confirm the starting gear of the pre-treatment air unit to ensure that the unit can operate as expected.

[0046] In the first embodiment, the refrigeration mechanism of the pre-treatment air unit includes a first refrigeration system, a second refrigeration system, a third refrigeration system, a fourth refrigeration system, and a fifth refrigeration system. The power of the fixed-frequency compressors of the first refrigeration system, the second refrigeration system, and the third refrigeration system is 25HP, and the power of the fixed-frequency compressors of the fourth refrigeration system and the fifth refrigeration system is 10HP.

[0047] When the real-time air duct operation mode is double air duct operation, the starting gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the double air duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined starting gear. Specifically, it includes:

[0048] When 2°C ≤ real-time inlet and outlet air temperature difference < 12°C, start the fifth refrigeration system.

[0049] When 12°C ≤ real-time inlet and outlet air temperature difference < 16°C, start the fourth refrigeration system and the fifth refrigeration system.

[0050] When 16°C ≤ real-time inlet and outlet air temperature difference < 18°C, start the third refrigeration system.

[0051] When 18°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the third refrigeration system and the fifth refrigeration system.

[0052] When 22°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third refrigeration system, the fourth refrigeration system, and the fifth refrigeration system.

[0053] When 26°C ≤ real-time inlet and outlet air temperature difference < 28°C, start the first refrigeration system and the third refrigeration system;

[0054] When 28°C ≤ real-time inlet and outlet air temperature difference < 32°C, start the first refrigeration system, the third refrigeration system and the fifth refrigeration system;

[0055] When 32°C ≤ real-time inlet and outlet air temperature difference < 36°C, start the first refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system;

[0056] When 36°C ≤ real-time inlet and outlet air temperature difference < 38°C, start the first refrigeration system, the second refrigeration system and the third refrigeration system;

[0057] When 38°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system and the fourth refrigeration system;

[0058] When the real-time inlet and outlet air temperature difference ≥ 42°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system.

[0059] When the real-time air duct operation mode is single air duct operation, determine the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference and the single air duct adjustment table, and start the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, specifically including:

[0060] When 2°C ≤ real-time inlet and outlet air temperature difference < 14°C, start the fifth refrigeration system;

[0061] When 14°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the fourth refrigeration system and the fifth refrigeration system;

[0062] When 22°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third refrigeration system;

[0063] When 26°C ≤ real-time inlet and outlet air temperature difference < 34°C, start the third refrigeration system and the fifth refrigeration system;

[0064] When 34°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system;

[0065] When 42°C ≤ real-time inlet and outlet air temperature difference < 46°C, start the first refrigeration system and the third refrigeration system;

[0066] When 46°C ≤ real-time inlet and outlet air temperature difference < 54°C, start the first refrigeration system, the third refrigeration system and the fifth refrigeration system;

[0067] When 54°C ≤ real-time inlet and outlet air temperature difference < 62°C, start the first refrigeration system, the third refrigeration system, the fourth refrigeration system, and the fifth refrigeration system;

[0068] When 62°C ≤ real-time inlet and outlet air temperature difference < 66°C, start the first refrigeration system, the second refrigeration system, and the third refrigeration system;

[0069] When 66°C ≤ real-time inlet and outlet air temperature difference < 74°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, and the fourth refrigeration system;

[0070] When the real-time inlet and outlet air temperature difference ≥ 74°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, the fourth refrigeration system, and the fifth refrigeration system.

[0071] In this embodiment, the first refrigeration system and the second refrigeration system, the second refrigeration system and the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system are backup to each other.

[0072] In this embodiment, after starting the supply fan, the pre-treatment air unit pre-activates the fixed-frequency compressors of the refrigeration systems at the corresponding gears according to the real-time air duct operation mode and the adjustment gears corresponding to the real-time inlet and outlet air temperature difference; after the pre-activation is completed, the working state of the refrigeration system is adjusted according to the comparison result between the real-time outlet air temperature and the set outlet air temperature information, that is, upshifting, downshifting, or keeping the gear unchanged; for example, the set outlet air temperature information may include the set outlet air temperature and the set outlet air temperature accuracy, and based on the difference between the set outlet air temperature and its accuracy, combined with the sum value, an outlet air temperature setting range is constructed; when the real-time outlet air temperature is higher than the set outlet air temperature range, upshifting is performed, when the real-time outlet air temperature is lower than the set outlet air temperature range, downshifting is performed, and when the real-time outlet air temperature falls within the set outlet air temperature range, the gear remains unchanged; the adjustment of the gear can refer to the corresponding single air duct adjustment table or double air duct adjustment table. For example, if the third, fourth, and fifth refrigeration systems are pre-activated, when upshifting, the fourth and fifth refrigeration systems are closed, and the first and third refrigeration systems are activated.

[0073] In this embodiment, first, by setting up five independent refrigeration systems, it is ensured that the unit can be flexibly combined and started under different working conditions to meet diverse cooling requirements. Second, the stable start of the refrigeration mechanism is achieved according to the real-time inlet and outlet air temperature difference, the double-duct adjustment table, and the single-duct adjustment table. For example, when the real-time inlet and outlet air temperature difference is between 2°C and 12°C, only the fifth refrigeration system is started; when the real-time inlet and outlet air temperature difference is between 12°C and 16°C, the fourth and fifth refrigeration systems are started simultaneously. This start-up mechanism ensures that the refrigeration system provides an appropriate cooling effect while achieving efficient and energy-saving operation. Furthermore, the unit intelligently adjusts the corresponding number of refrigeration systems according to the comparison result of the real-time outlet air temperature and the set outlet air temperature information, avoiding energy waste caused by a single system running at a high load for a long time. On the basis of ensuring sufficient refrigeration capacity, unnecessary energy consumption is avoided. This energy management strategy significantly improves energy utilization efficiency and reduces operating costs. Finally, the design of multiple refrigeration systems enhances the reliability of the unit. When a certain refrigeration system shuts down due to a fault, other systems can quickly take over its work, ensuring the continuity and stability of the overall operation of the unit and greatly reducing the risk of the entire system being paralyzed due to a single fault.

[0074] In the second embodiment, the refrigeration mechanism of the pre-treatment air unit includes a first refrigeration system, a second refrigeration system, a third refrigeration system, and a variable-frequency refrigeration system. The power of the fixed-frequency compressors of the first refrigeration system, the second refrigeration system, and the third refrigeration system is 25HP, and the refrigeration capacity of the variable-frequency refrigeration system is the same as that of a fixed-frequency compressor with a power of 20HP. When the real-time air duct operation mode is double-duct operation, the start-up gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the double-duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined start-up gear, which specifically includes:

[0075] When 2°C ≤ real-time inlet and outlet air temperature difference < 16°C, start the variable-frequency refrigeration system;

[0076] When 16°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third refrigeration system and the variable-frequency refrigeration system;

[0077] When 26°C ≤ real-time inlet and outlet air temperature difference < 36°C, start the first refrigeration system, the third refrigeration system, and the variable-frequency refrigeration system;

[0078] When the real-time inlet and outlet air temperature difference ≥ 36°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system, and the variable-frequency refrigeration system.

[0079] When the real-time air duct operation mode is single-duct operation, the start-up gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the single-duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined start-up gear, which specifically includes:

[0080] When 2°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the variable-frequency refrigeration system;

[0081] When 22°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the third refrigeration system and the variable-frequency refrigeration system of the refrigeration system;

[0082] When 42°C ≤ real-time inlet and outlet air temperature difference < 62°C, start the first refrigeration system, the third refrigeration system and the variable-frequency refrigeration system;

[0083] When the real-time inlet and outlet air temperature difference ≥ 62°C, start the first refrigeration system, the second refrigeration system, the third refrigeration system and the variable-frequency refrigeration system.

[0084] In this embodiment, the first refrigeration system, the second refrigeration system and the third refrigeration system are backup to each other, and the power of the fixed-frequency compressors of the first refrigeration system, the second refrigeration system and the third refrigeration system is 25HP.

[0085] In this embodiment, after the pre-treatment air unit starts the supply fan, according to the real-time air duct operation mode and the adjustment gear corresponding to the real-time inlet and outlet air temperature difference, pre-start the fixed-frequency compressor or the variable-frequency refrigeration system of the refrigeration system at the corresponding gear, where the variable-frequency refrigeration system is started at the rated frequency; after the pre-start is completed, adjust the working state of the refrigeration system according to the comparison result between the real-time outlet air temperature and the set outlet air temperature information, that is, upshift, downshift or keep the gear unchanged; when the corresponding adjustment gear includes the variable-frequency refrigeration system, first perform the frequency increase and decrease adjustment of the variable-frequency compressor of the variable-frequency refrigeration system; if the variable-frequency compressor needs to be loaded after increasing the frequency to the highest frequency, then upshift, and after upshifting, the variable-frequency compressor is adjusted to the upshift frequency and then adjusted; if the variable-frequency compressor needs to be unloaded after decreasing the frequency to the lowest frequency, then downshift, and after downshifting, the variable-frequency compressor is adjusted to the downshift frequency and then adjusted; for example, the set outlet air temperature information may include the set outlet air temperature and the set outlet air temperature accuracy, and based on the difference between the set outlet air temperature and its accuracy, combined with the sum value, construct the outlet air temperature setting range; when the real-time outlet air temperature is higher than the set outlet air temperature range, perform frequency increase or upshift, when the real-time outlet air temperature is lower than the set outlet air temperature range, perform frequency decrease or downshift, and when the real-time outlet air temperature falls within the set outlet air temperature range, keep the working frequency and gear unchanged; the adjustment of the gear can refer to the corresponding single air duct adjustment table or double air duct adjustment table. For example, if the variable-frequency refrigeration system is pre-started, if the real-time outlet air temperature is higher than the set outlet air temperature range, first increase the frequency of the variable-frequency compressor to the highest frequency, and if it is subsequently detected that the real-time outlet air temperature is still higher than the set outlet air temperature range, then upshift, and adjust the working frequency of the variable-frequency compressor of the variable-frequency refrigeration system to the upshift frequency and start the third refrigeration system.

[0086] In this embodiment, first, through the cooperation of the first refrigeration system, the second refrigeration system, the third refrigeration system and the variable-frequency refrigeration system, the unit can cope with various complex working conditions, ensuring efficient and stable operation in different environments to meet the refrigeration requirements in different seasons. Secondly, combining the stability of the fixed-frequency compressor and the energy-saving advantages of the variable-frequency technology, by dynamically adjusting the refrigeration capacity, the energy consumption is effectively reduced, achieving the goal of high efficiency and energy saving. Finally, the unit can automatically adjust its working state according to the comparison result of the real-time air outlet temperature and the set air outlet temperature information, the double-duct adjustment table and the single-duct adjustment table. According to different comparison results, start the corresponding refrigeration system or variable-frequency refrigeration system or adjust the working frequency of the variable-frequency refrigeration system to ensure that the unit can operate in the most suitable way under different working conditions, thus improving the overall operation efficiency and extending the service life of the equipment.

[0087] In the third embodiment, the refrigeration mechanism of the pre-treatment air unit includes a first variable-frequency system, a second variable-frequency system, a third variable-frequency system and a fourth variable-frequency system with the same refrigeration capacity. When the real-time air duct operation mode is double-duct operation, determine the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference and the double-duct adjustment table, and start the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, which specifically includes:

[0088] When 2°C ≤ real-time inlet and outlet air temperature difference < 16°C, start the fourth variable-frequency refrigeration system;

[0089] When 16°C ≤ real-time inlet and outlet air temperature difference < 26°C, start the third variable-frequency system and the fourth variable-frequency refrigeration system of the refrigeration system;

[0090] When 26°C ≤ real-time inlet and outlet air temperature difference < 36°C, start the second variable-frequency refrigeration system, the third variable-frequency refrigeration system and the fourth variable-frequency refrigeration system;

[0091] When the real-time inlet and outlet air temperature difference ≥ 36°C, start the first variable-frequency refrigeration system, the second variable-frequency refrigeration system, the third variable-frequency refrigeration system and the fourth variable-frequency refrigeration system.

[0092] When the real-time air duct operation mode is single-duct operation, determine the starting gear of the pre-treatment air unit based on the real-time inlet and outlet air temperature difference and the single-duct adjustment table, and start the refrigeration mechanism of the pre-treatment air unit based on the determined starting gear, which specifically includes:

[0093] When 2°C ≤ real-time inlet and outlet air temperature difference < 22°C, start the fourth variable-frequency refrigeration system;

[0094] When 22°C ≤ real-time inlet and outlet air temperature difference < 42°C, start the third variable-frequency system and the fourth variable-frequency refrigeration system of the refrigeration system;

[0095] When 42°C ≤ the real-time inlet and outlet air temperature difference < 62°C, start the second variable-frequency refrigeration system, the third variable-frequency refrigeration system, and the fourth variable-frequency refrigeration system;

[0096] When the real-time inlet and outlet air temperature difference ≥ 62°C, start the first variable-frequency refrigeration system, the second variable-frequency refrigeration system, the third variable-frequency refrigeration system, and the fourth variable-frequency refrigeration system.

[0097] In this embodiment, the first variable-frequency refrigeration system, the second variable-frequency refrigeration system, the third variable-frequency refrigeration system, and the fourth variable-frequency refrigeration system are backup to each other.

[0098] In this embodiment, after the pre-treatment air unit starts the supply fan, according to the real-time air duct operation mode and the adjustment gear corresponding to the real-time inlet and outlet air temperature difference, pre-start the variable-frequency compressors of the variable-frequency refrigeration systems at the corresponding gears, and the variable-frequency compressors are started at the rated frequency; after the pre-start is completed, adjust the working state of the refrigeration system according to the comparison result between the real-time outlet air temperature and the set outlet air temperature information, that is, perform frequency increase and gear increase, frequency decrease and gear decrease, or keep the frequency and gear unchanged; specifically, first perform the frequency adjustment of the variable-frequency compressors of the variable-frequency refrigeration systems; the variable-frequency compressors increase the frequency starting from the variable-frequency refrigeration system with a smaller serial number. After the variable-frequency compressor with a smaller serial number increases the frequency to the highest frequency, then the variable-frequency compressor with a larger serial number starts to increase the frequency; the variable-frequency compressors decrease the frequency starting from the variable-frequency refrigeration system with a larger serial number. After the variable-frequency compressor with a larger serial number decreases the frequency to the lowest frequency, then the variable-frequency compressor with a smaller serial number starts to decrease the frequency; if all variable-frequency compressors need to be loaded after increasing the frequency to the highest frequency, then increase the gear. After increasing the gear, all variable-frequency compressors are adjusted to the increased gear frequency and then adjusted; if all variable-frequency compressors need to be unloaded after decreasing the frequency to the lowest frequency, then decrease the gear. After decreasing the gear, all variable-frequency compressors are adjusted to the decreased gear frequency and then adjusted; for example, the set outlet air temperature information may include the set outlet air temperature and the set outlet air temperature accuracy, and based on the difference between the set outlet air temperature and its accuracy, combined with the sum value, construct the outlet air temperature setting range; when the real-time outlet air temperature is higher than the set outlet air temperature range, first increase the frequency and then increase the gear. When the real-time outlet air temperature is lower than the set outlet air temperature range, first decrease the frequency and then decrease the gear. When the real-time outlet air temperature falls within the set outlet air temperature range, then keep the working frequency and gear unchanged; the adjustment of the gear can refer to the corresponding single air duct adjustment table or double air duct adjustment table. For example, if the fourth variable-frequency refrigeration system is pre-started, if the real-time outlet air temperature is higher than the outlet air temperature setting range, first increase the frequency of the variable-frequency compressor of the fourth variable-frequency refrigeration system to the highest frequency. If it is subsequently detected that the real-time outlet air temperature is still higher than the outlet air temperature setting range, then increase the gear, adjust the working frequency of the fourth variable-frequency refrigeration system to the increased gear frequency and start the third variable-frequency refrigeration system.

[0099] In this embodiment, first, through the cooperation of four variable-frequency refrigeration systems with the same refrigerating capacity, the unit can cope with various complex working conditions, ensuring efficient and stable operation in different environments to meet the refrigeration requirements in different seasons. Secondly, the unit can automatically confirm its startup state according to different air duct modes and preset adjustment strategies. Specifically, when the real-time inlet and outlet air temperature difference is within the range of 2°C to 16°C, only the fourth variable-frequency refrigeration system needs to be started to achieve energy-saving and efficient cooling effects. If the real-time inlet and outlet air temperature difference is large, the unit will sequentially perform the frequency-up operation of the variable-frequency refrigeration system or start more variable-frequency refrigeration systems to meet higher cooling requirements. When the real-time inlet and outlet air temperature difference reaches or exceeds 36°C, all four variable-frequency refrigeration systems will be started to ensure that the unit can quickly and effectively reduce the temperature. In addition, based on the comparison result of the real-time outlet air temperature and the set outlet air temperature information and the intelligent adjustment strategy of the single and double air duct adjustment tables, the unit realizes precise response to cooling requirements, not only improving the operation efficiency of the unit, reducing energy consumption, but also extending the service life of the unit.

[0100] In the fourth embodiment of the present invention, compared with the third embodiment, only the frequency adjustment method of the variable-frequency compressor in the variable-frequency refrigeration system is changed. Specifically, the frequency increase and decrease of the variable-frequency compressor are carried out synchronously. When the frequencies of all variable-frequency compressors need to be increased to the highest frequency and further loading is still required, a gear-up operation will be performed. Subsequently, all variable-frequency compressors will be adjusted to the frequency after gear-up and synchronously adjusted. On the contrary, when the frequencies of all variable-frequency compressors need to be reduced to the lowest frequency and further unloading is still required, a gear-down operation will be performed. After that, all variable-frequency compressors will be adjusted to the frequency after gear-down and synchronously adjusted.

[0101] The present invention also correspondingly provides a pre-treatment air unit, and the pre-treatment air unit realizes working control by using the control method described in any one of the above. The pre-treatment air unit includes a housing, an air inlet and an air outlet are provided on the housing, a control device, a air supply mechanism and a refrigeration mechanism electrically connected to the control device are arranged in the housing. The air supply mechanism is used to transport the pre-treated air from the air inlet to the air outlet, and the refrigeration mechanism is used to realize the pre-treatment of the air.

[0102] In this embodiment, the air supply system includes an air duct and a air supply fan. The air duct has an air inlet for pre-treated air to enter and an air outlet for connecting to an aircraft. The air supply fan is installed in the air duct and is used to transport the pre-treated air from the air inlet to the air outlet. The air outlet can be connected to 2 air ducts, and the control device is used to select dual-air-duct operation and single-air-duct operation.

[0103] In this embodiment, the refrigeration mechanism includes a plurality of refrigeration systems, and the plurality of refrigeration systems are sequentially arranged along the air inlet and outlet direction.

[0104] It is understood that those of ordinary skill in the art can make equivalent substitutions or modifications based on the technical solutions of the present invention and its inventive concept, and all such modifications or substitutions should fall within the protection scope of the present invention.

Claims

1. A control method for a pre-processed air unit, characterized in that: Includes steps: Acquire basic information, and construct a single-duct adjustment table and a double-duct adjustment table based on the acquired basic information, wherein the single-duct adjustment table and the double-duct adjustment table respectively include a plurality of adjustment gears and actions corresponding to the adjustment gears; When the blower of the pre-processed air unit is started, the preset temperature information, the real-time inlet air temperature and the real-time air duct operation mode are obtained, and the real-time inlet and outlet air temperature difference is calculated based on the real-time inlet air temperature and the preset temperature information; When the real-time duct operation mode is double duct operation, the starting gear of the pre-processed air unit is determined based on the real-time inlet and outlet air temperature difference and the double duct adjustment table, and the refrigeration mechanism of the pre-processed air unit is started based on the determined starting gear, and then the real-time outlet air temperature is obtained, and the working state of the refrigeration mechanism is adjusted according to the comparison result of the real-time outlet air temperature and the preset outlet air temperature information; When the real-time duct operation mode is single duct operation, the starting gear of the pre-treatment air unit is determined based on the real-time inlet and outlet air temperature difference and the single duct adjustment table, and the refrigeration mechanism of the pre-treatment air unit is started based on the determined starting gear, and then the real-time outlet air temperature is obtained, and the working state of the refrigeration mechanism is adjusted according to the comparison result of the real-time outlet air temperature and the preset outlet air temperature information.

2. A control method for a pre-processed air unit according to claim 1, characterized in that: The obtaining of basic information specifically includes: Obtaining basic information, wherein the basic information includes operating parameters of the refrigeration mechanism and a preset gear temperature difference, wherein the operating parameters of the refrigeration mechanism include a refrigeration type and a refrigeration power, and the preset gear temperature difference is 2° C.-4° C.; The single duct temperature adjustment range and the double duct temperature adjustment range are determined based on the operating parameters of the refrigeration mechanism.

3. A control method for a pre-processed air unit according to claim 2, characterized in that: The single duct adjustment table and the double duct adjustment table are constructed based on the acquired basic information, and the single duct adjustment table and the double duct adjustment table respectively include multiple adjustment gears and actions corresponding to the adjustment gears, specifically including: A single duct adjustment table is constructed based on the single duct adjustment range and the preset gear temperature difference, wherein the single duct adjustment table includes a plurality of single duct adjustment gears and actions corresponding to the single duct adjustment gears, and the single duct adjustment gears include adjustment gears corresponding to the real-time inlet and outlet air temperature difference; A dual duct adjustment table is constructed based on the dual duct adjustment range and the preset gear temperature difference. The dual duct adjustment table includes multiple dual duct adjustment gears and actions corresponding to the dual duct adjustment gears. The dual duct adjustment gears include adjustment gears corresponding to the real-time inlet and outlet air temperature difference.

4. A control method for a pre-processed air unit according to claim 1, characterized in that: When the blower of the pre-processed air unit is started, the preset temperature information, the real-time air inlet temperature and the real-time air duct operation mode are obtained, and the real-time inlet and outlet temperature difference is calculated based on the real-time air inlet temperature and the preset temperature information, specifically including: Acquire preset temperature information, wherein the preset temperature information includes a preset air outlet temperature and a preset fan temperature rise; When the blower of the pre-processed air unit is started, the real-time inlet air temperature and the real-time air duct operation mode are obtained; The preset outlet air temperature is adjusted based on the real-time inlet air temperature to obtain the adjusted outlet air temperature, and the preset fan temperature rise is adjusted based on the adjusted inlet air temperature and the real-time air duct operation mode to obtain the adjusted fan temperature rise; the real-time inlet and outlet air temperature difference is calculated based on the real-time inlet air temperature, the adjusted outlet air temperature and the adjusted fan temperature rise.

5. The control method of a pre-processed air unit according to claim 1, characterized in that: The refrigeration mechanism includes a first refrigeration system, a second refrigeration system, a third refrigeration system, a fourth refrigeration system and a fifth refrigeration system, the power of the fixed-frequency compressors of the first refrigeration system, the second refrigeration system and the third refrigeration system is 25HP, and the power of the fixed-frequency compressors of the fourth refrigeration system and the fifth refrigeration system is 10HP; when the real-time duct operation mode is double duct operation, the starting gear of the pre-processed air unit is determined based on the real-time inlet and outlet air temperature difference and the double duct adjustment table, and the refrigeration mechanism of the pre-processed air unit is started based on the determined starting gear, specifically including: When the real-time inlet and outlet air temperature difference is 2℃≤<12℃, the fifth refrigeration system is started; When the real-time inlet and outlet air temperature difference is 12℃≤<16℃, the fourth refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 16℃≤<18℃, the third refrigeration system is started; When the real-time inlet and outlet air temperature difference is 18℃≤<22℃, the third refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 22℃≤<26℃, the third, fourth and fifth refrigeration systems of the refrigeration system are started; When the real-time inlet and outlet air temperature difference is 26℃≤<28℃, the first refrigeration system and the third refrigeration system are started; When the real-time inlet and outlet air temperature difference is 28℃≤<32℃, the first refrigeration system, the third refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 32°C ≤ 36°C, the first refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 36℃≤38℃, the first refrigeration system, the second refrigeration system and the third refrigeration system are started; When the real-time inlet and outlet air temperature difference is 38°C ≤ 42°C, the first refrigeration system, the second refrigeration system, the third refrigeration system and the fourth refrigeration system are started; When the real-time inlet and outlet air temperature difference is ≥42°C, the first refrigeration system, the second refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system are started.

6. A control method for a pre-processed air unit according to claim 5, characterized in that: When the real-time air duct operation mode is single air duct operation, determining the starting gear of the pre-processed air unit based on the real-time inlet and outlet air temperature difference and the single air duct adjustment table, and starting the refrigeration mechanism of the pre-processed air unit based on the determined starting gear, specifically includes: When the real-time inlet and outlet air temperature difference is 2℃≤<14℃, the fifth refrigeration system is started; When the real-time inlet and outlet air temperature difference is 14℃≤<22℃, the fourth refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 22℃≤<26℃, the third refrigeration system is started; When the real-time inlet and outlet air temperature difference is 26℃≤<34℃, the third refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 34°C ≤ 42°C, the third, fourth and fifth refrigeration systems of the refrigeration system are started; When the real-time inlet and outlet air temperature difference is 42℃≤<46℃, the first refrigeration system and the third refrigeration system are started; When the real-time inlet and outlet air temperature difference is 46℃≤<54℃, the first refrigeration system, the third refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 54°C ≤ 62°C, the first refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system are started; When the real-time inlet and outlet air temperature difference is 62℃≤66℃, the first refrigeration system, the second refrigeration system and the third refrigeration system are started; When the real-time inlet and outlet air temperature difference is 66°C ≤ 74°C, the first refrigeration system, the second refrigeration system, the third refrigeration system and the fourth refrigeration system are started; When the real-time inlet and outlet air temperature difference is ≥74°C, the first refrigeration system, the second refrigeration system, the third refrigeration system, the fourth refrigeration system and the fifth refrigeration system are started.

7. A control method for a pre-processed air unit according to claim 1, characterized in that: The refrigeration mechanism includes a first refrigeration system, a second refrigeration system, a third refrigeration system and a variable frequency refrigeration system, the power of the fixed frequency compressors of the first refrigeration system, the second refrigeration system and the third refrigeration system is 25HP, and the refrigeration capacity of the variable frequency refrigeration system is consistent with the refrigeration capacity of the fixed frequency compressor with a power of 20HP; When the real-time air duct operation mode is double air duct operation, determining the starting gear of the pre-processed air unit based on the real-time inlet and outlet air temperature difference and the double air duct adjustment table, and starting the refrigeration mechanism of the pre-processed air unit based on the determined starting gear, specifically includes: When the real-time inlet and outlet air temperature difference is 2℃≤<16℃, the variable frequency refrigeration system is started; When the real-time inlet and outlet temperature difference is 16℃≤<26℃, the third refrigeration system and the variable frequency refrigeration system are started; when the real-time inlet and outlet temperature difference is 26℃≤<36℃, the first refrigeration system, the third refrigeration system and the variable frequency refrigeration system are started; When the real-time inlet and outlet air temperature difference is ≥36°C, the first refrigeration system, the second refrigeration system, the third refrigeration system and the variable frequency refrigeration system are started.

8. A control method for a pre-processed air unit according to claim 7, characterized in that: When the real-time air duct operation mode is single air duct operation, determining the starting gear of the pre-processed air unit based on the real-time inlet and outlet air temperature difference and the single air duct adjustment table, and starting the refrigeration mechanism of the pre-processed air unit based on the determined starting gear, specifically includes: When the real-time inlet and outlet air temperature difference is 2℃≤<22℃, the variable frequency refrigeration system is started; When the real-time inlet and outlet temperature difference is 22℃≤<42℃, the third refrigeration system and the variable frequency refrigeration system are started; when the real-time inlet and outlet temperature difference is 42℃≤<62℃, the first refrigeration system, the third refrigeration system and the variable frequency refrigeration system are started; When the real-time inlet and outlet air temperature difference is ≥62°C, the first refrigeration system, the second refrigeration system, the third refrigeration system and the variable frequency refrigeration system are started.

9. A control method for a pre-processed air unit according to claim 1, characterized in that: The refrigeration mechanism includes a first frequency conversion system, a second frequency conversion system, a third frequency conversion system and a fourth frequency conversion system with the same refrigeration capacity; when the real-time duct operation mode is double duct operation, the starting gear of the pre-processed air unit is determined based on the real-time inlet and outlet air temperature difference and the double duct adjustment table, and the refrigeration mechanism of the pre-processed air unit is started based on the determined starting gear, specifically including: When the real-time inlet and outlet air temperature difference is 2℃≤<16℃, the fourth variable frequency refrigeration system is started; When the real-time inlet and outlet air temperature difference is 16℃≤<26℃, the third variable frequency system and the fourth variable frequency refrigeration system of the refrigeration system are started; When the real-time inlet and outlet temperature difference is 26℃≤<36℃, the second variable frequency refrigeration system, the third variable frequency refrigeration system and the fourth variable frequency refrigeration system are started; When the real-time inlet and outlet air temperature difference is ≥36°C, the first variable frequency refrigeration system, the second variable frequency refrigeration system, the third variable frequency refrigeration system and the fourth variable frequency refrigeration system are started.

10. A pre-processed air unit, characterized in that: The pre-treatment air unit adopts the control method as described in any one of claims 1 to 9 to realize working control; the pre-treatment air unit includes a shell, the shell is provided with an air inlet and an air supply outlet, the shell is provided with a control device and an air supply mechanism and a refrigeration mechanism electrically connected to the control device respectively; the air supply mechanism is used to transport the pre-treated air from the air inlet to the air supply outlet, and the refrigeration mechanism is used to realize air pretreatment.

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