A DC variable frequency energy-saving cold dryer based on dew point temperature and its adjustment method

Abstract

The present invention discloses a DC variable frequency energy-saving cold dryer based on dew point temperature, comprising: a heat exchanger, a pre-processed air input port and a finished air output port above the heat exchanger, and the heat exchanger is provided with a pre-cooling heat exchange zone, an evaporation heat exchange zone, and a gas-water separation zone from top to bottom; the present invention cooperates with a dew point temperature detection component and a control module, and the working frequency of the variable frequency compressor and the cooling capacity of the condensing component can be dynamically adjusted according to the actual load, thereby avoiding unnecessary energy waste. The temperature of the gas-water separation zone is monitored in real time by the dew point temperature detection component. When the temperature is higher than the preset value, the control module will increase the working frequency of the variable frequency compressor, on the one hand, to increase the cooling capacity, match the corresponding heat load, and reduce the dew point temperature; on the other hand, the refrigerant flow rate is increased, thereby improving the reflux effect of the lubricating oil. At the same time, the return oil replenishment component will replace part of the lubricating oil within a preset period to ensure the stability and efficiency of the lubrication system.

Description

Technical Field

[0001] The invention discloses a direct current variable frequency energy-saving cold dryer based on dew point temperature and a regulating method thereof, belonging to the technical field of cold dryers. Background Art

[0002] In order to achieve carbon emission targets, the country vigorously advocates energy conservation and emission reduction. In the field of refrigeration, household air conditioners, heat pumps, etc. have been using variable frequency systems on a large scale. However, due to differences in working conditions, most of the cold dryers on the market still use industrial frequency refrigeration systems and mechanical switches, which have poor adjustment performance and are not conducive to energy conservation and emission reduction.

[0003] DC variable frequency cold dryer is an air compression cold drying equipment that uses DC variable frequency technology. It is mainly used to remove moisture from compressed air and provide dry compressed air. It is widely used in pharmaceutical, food, electronics, textile and other industries. Compared with traditional cold dryers, DC variable frequency cold dryers have significant energy efficiency advantages. Through variable frequency technology, the cold dryer can adjust the motor speed according to the actual demand for compressed air, achieve matching of energy consumption and load, and greatly reduce energy consumption during non-essential operation.

[0004] When the existing DC variable frequency cold dryer operates at a low frequency for a long time, the refrigerant flow rate will be too low, resulting in difficulty in oil return, and long-term operation will easily cause damage to the compressor. If the compressor is forced to increase the frequency, although the lubricating fluid can be accelerated to return, the heat exchanger will have too high pumping input efficiency due to the compressor, so it is necessary to increase the cold air output of the condenser. The sudden drop in temperature in the air-water separation area is prone to rapid ice blockage, which affects the air-water separation efficiency, reduces the output efficiency, and increases energy consumption.

[0005] Therefore, the purpose of this study is to design a DC variable frequency energy-saving cold dryer that can ensure stable and high-quality oil return of the lubricating oil, stabilize the gas-water separation area at the critical temperature, and dynamically adjust the cooling capacity input inside the heat exchanger according to the dew point temperature to reduce energy waste. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a DC variable frequency energy-saving cold dryer based on dew point temperature to solve the problems of the prior art.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: A DC variable frequency energy-saving cold dryer based on dew point temperature, comprising: a heat exchanger, wherein a pre-processed air input port and a finished air output port are arranged above the heat exchanger, and the heat exchanger is provided with a pre-cooling heat exchange area, an evaporation heat exchange area, and an air-water separation area from top to bottom; A water storage area is provided below the gas-water separation area, and a dew point temperature detection component is provided in a high area of ​​the water storage area for detecting the temperature state of the compressed air above the water storage area; A drying component arranged around the dew point temperature detection component, through which a dry airflow is intermittently flushed toward the dew point temperature detection component to maintain a sensitive state of the surface of the dew point temperature detection component; The input port is connected to the variable frequency compressor of the output port of the evaporation heat exchange zone through a first pipeline, the output port of the variable frequency compressor and the condensation component are connected through a second pipeline, and the input port of the evaporation heat exchange zone is connected to the condensation component through a third pipeline; An oil return replenishing assembly is arranged inside the variable frequency compressor, the oil return replenishing assembly includes an oil return pipe installed inside the variable frequency compressor, and the lubricating oil in the oil return pipe is partially replaced within a preset cycle by the oil return replenishing assembly; A main control valve body is arranged on the third pipeline, and the connection state between the third pipeline and the condensation component is controlled by the main control valve body; The fourth pipeline is connected to the input port of the evaporation heat exchange zone through the third pipeline, and a secondary control valve body is arranged on the fourth pipeline, and the connection state between the third pipeline and the fourth pipeline is controlled by the secondary control valve body; A control module, wherein the control module is electrically connected to the dew point temperature detection component, the variable frequency compressor, the condensation component, the main control valve body, and the auxiliary control valve body; Hot air is input into the precooling heat exchange zone from the pre-processing air input port, and the condensation component inputs condensed liquid toward the air-water separation zone through the third pipeline, and the condensed liquid and the hot air are heat-exchanged in the evaporation heat exchange zone to form water droplets and cooling air flow, and the water droplets enter the water storage area; The dew point temperature detection component detects the cooling air flow temperature. When the temperature of the dew point temperature detection component is higher than the preset temperature, the air load increases. The variable frequency compressor is controlled by the control module to increase the preset working frequency. The cooling capacity of the condensing component increases. The control module is controlled to increase the opening amplitude of the main control valve body to improve the heat exchange efficiency of the evaporation heat exchange zone and maintain the evaporation temperature. When the temperature of the dew point temperature detection component is lower than the preset temperature, the air load is reduced, the variable frequency compressor is controlled by the control module to reduce the frequency, the preset working frequency is restored, the condensing component reduces the cooling capacity, and the preset cooling capacity is restored. The control module is controlled to reduce the opening amplitude of the main control valve body, and the control module is controlled to open the auxiliary control valve body, so that the gas in the fourth pipeline and the low-temperature liquid in the third pipeline are mixed to form a low-temperature gas-liquid mixture, and the temperature of the evaporation heat exchange zone is increased to avoid ice formation and reduce the heat exchange efficiency. The function of anti-icing and dew point stabilization is realized.

[0008] As a further improvement, a vertical air duct is provided inside the heat exchanger, the vertical air duct is connected to the water storage area, and the dew point temperature detection component includes a temperature sensor suspended inside the air duct, and the temperature sensor is electrically connected to the control module.

[0009] As a further improvement, the drying assembly includes a plurality of air jet pipes arranged around the temperature sensor, and the input ports above the plurality of air jet pipes are connected to the annular air pipe above the air jet pipes; The input port of the annular air pipe is connected to the first pipeline, and the input port of the annular air pipe is provided with a solenoid valve switch, and the solenoid valve switch is electrically connected to the control module.

[0010] As a further improvement, the control module controls the solenoid valve switch to start and stop within a preset period, and the gas is pressurized and ejected through the annular air pipe through the jet pipe, and the wind flows from top to bottom to clean the surface of the temperature sensor, thereby ensuring its accuracy; As a further improvement, the air jet pipe is arranged to be inclined from top to bottom.

[0011] As a further improvement, the ratio of the diameter of the upper air inlet of the air jet pipe to the diameter of the lower air outlet is 3:1.

[0012] As a further improvement, the condensation component includes a condenser connected to the second pipe, and a refrigerant filter connected to the condenser and connected to a third pipe. The airflow passes through the second pipe and is processed by the condenser and the refrigerant filter to form a condensate flow that is input into the evaporative heat exchange area.

[0013] As a further improvement, the return oil replenishing component includes an oil drain port arranged in the output direction of the return oil pipe, an oil delivery port arranged in the input direction of the return oil pipe, and a first control component for controlling the opening / closing of the oil drain port and a second control component for controlling the opening / closing of the oil delivery port. When the lubricating oil refluxes, the oil drain port is controlled by the first control component to be closed after opening for a preset time, and the oil delivery port is controlled by the second control component to be closed after opening for a preset time, thereby discharging part of the old lubricating oil and replenishing part of the new lubricating oil.

[0014] As a further improvement, an ice blocking cutting net assembly is arranged at the output port connected to the evaporating heat exchange zone and the first pipeline, and the ice blocking cutting net assembly includes a group of superimposed meshes, the holes on two of the meshes coincide with the output airway ports, and a group of telescopic guide rod motors are arranged on opposite sides of the two meshes. The telescopic guide rod motors are electrically connected to the control module, and the meshes are driven to move tangentially from opposite sides of the two meshes by the two telescopic guide rod motors, so that the corresponding holes on the two meshes are repeatedly displaced and overlapped.

[0015] The beneficial effects of the present invention are: Through the cooperation of the dew point temperature detection component and the control module, the working frequency of the variable frequency compressor and the refrigeration capacity of the condensing component can be dynamically adjusted according to the actual load, thereby avoiding unnecessary energy waste. The temperature of the gas-water separation zone is monitored in real time by the dew point temperature detection component. When the temperature is higher than the preset value, the control module will increase the working frequency of the variable frequency compressor and increase the flow rate of the refrigerant, thereby improving the reflux effect of the lubricating oil. At the same time, the return oil replenishment component will replace part of the lubricating oil within the preset period to ensure the stability and efficiency of the lubrication system.

[0016] Due to the dynamic frequency adjustment and oil return replenishment mechanism, the wear and damage of the compressor caused by insufficient lubricating oil return is avoided, and the service life of the equipment is extended. However, when the frequency is forced to increase, it is easy to cause a sudden drop in the temperature of the evaporation heat exchange area, which is prone to ice blockage.

[0017] By controlling the opening range of the main control valve body and the auxiliary control valve body, the hot air output from the fourth pipe is connected to the third pipe to combine with the condensate to form a low-temperature gas-liquid mixture, reducing the input of cooling capacity and avoiding ice blockage caused by too low temperature in the evaporation heat exchange area. This dynamic adjustment mechanism ensures that the evaporation heat exchange area is always within the critical temperature range, which not only ensures the gas-water separation efficiency, but also avoids ice blockage.

[0018] However, if the valve body is not adjusted in time and the temperature drops rapidly, it is inevitable that the airway opening that has been blocked by ice cannot be responded to quickly. Therefore, two sets of meshes are further arranged at the airway opening, and a telescopic guide rod motor is used to control the two sets of meshes to make tangential motion. When an icing state is formed, the meshes at the airway opening will freeze first, and the ice flakes on the meshes will be quickly broken into small ice flakes through short and high-frequency movements, and quickly detached with the mixed input airflow, thereby ensuring that the ice blockage state is quickly relieved in a short time.

[0019] In the realization of the above functions, the accuracy requirements for the dew point temperature detection component are extremely strict. Once an error occurs in the dew point temperature detection component, it will cause the control component to misjudge the control of all subsequent related components. Therefore, in order to ensure that the dew point temperature detection component can still maintain a relatively accurate state during long-term use, a drying component is arranged around the dew point temperature detection component. The drying component intermittently flushes the dew point temperature detection component with dry airflow to maintain the sensitive state of the surface of the dew point temperature detection component, thereby ensuring that the dew point temperature detection component can still maintain a relatively accurate state during long-term use.

[0020] Through the dynamic adjustment mechanism based on dew point temperature, the oil return difficulty problem caused by low refrigerant flow rate when the DC variable frequency cold dryer runs at low frequency for a long time is solved, while the ice blockage and increased energy consumption caused by forced frequency increase are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of a DC variable frequency energy-saving cold drying structure based on dew point temperature of the present invention.

[0023] Figure 2 It is a schematic diagram of the cross-sectional state partitioning of a heat exchanger of the present invention.

[0024] Figure 3 It is a schematic diagram of the structure of a jet pipe of a drying component of the present invention in a bottom view.

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of an air jet pipe of the present invention.

[0026] Figure 5 The utility model is a partial perspective schematic diagram of the local structure of an oil return pipe of a variable frequency compressor of the present invention.

[0027] Figure 6 It is a schematic diagram of the enlarged structure of the first state of an ice blocking and cutting network assembly of the present invention.

[0028] Figure 7 It is a schematic diagram of the enlarged structure of the second state of an ice blocking and cutting network assembly of the present invention.

[0029] Figure 8 The present invention is a schematic diagram of a DC variable frequency energy-saving cold dryer module control based on dew point temperature.

[0030] Fig. 9 The present invention is a step diagram of a method for adjusting a DC variable frequency energy-saving cold dryer based on dew point temperature.

[0031] 1. Heat exchanger; 11. Precooling heat exchange area; 12. Evaporation heat exchange area; 13. Air-water separation area; 14. Pre-processing air inlet; 15. Water storage area; 21. First pipeline; 22. Second pipeline; 23. Third pipeline; 24. Fourth pipeline; 2. Variable frequency compressor; 3. Condenser; 31. Refrigerant filter; 32. Mesh; 33. Telescopic guide rod motor; 34. Return oil replenishment assembly; 35. Return oil pipe; 4. Main control valve body; 5. Auxiliary control valve body; 6. Control Module; 7, temperature sensor; 16, vertical air duct; 17, jet pipe; 18, annular air pipe; 19, solenoid valve switch; 41, oil drain port; 42, oil delivery port; 43, first control component; 44, second control component; 51, suction temperature probe; 52, low pressure sensor; 53, exhaust temperature probe; 54, high pressure sensor; 55, automatic drain; 56, evaporation temperature probe; 101, finished air outlet; 131, separation net. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0033] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] Reference Figure 1-8 As shown, a DC variable frequency energy-saving cold dryer based on dew point temperature comprises: The heat exchanger 1 has a pre-processed air input port 14 and a finished air output port 101. The heat exchanger 1 is provided with a pre-cooling heat exchange area 11, an evaporation heat exchange area 12, and an air-water separation area 13 from top to bottom. A separation net 131 is fixedly provided between the air-water separation area 13 and the water storage area 15; A water storage area 15 is provided below the gas-water separation area 13, and a dew point temperature detection component is provided in a high area of ​​the water storage area 15 for detecting the temperature state of the compressed air above the water storage area 15; A drying component arranged around the dew point temperature detection component, through which a dry airflow is intermittently flushed toward the dew point temperature detection component to maintain a sensitive state of the surface of the dew point temperature detection component; The input port of the variable frequency compressor 2 is connected to the evaporation heat exchange area 12 through the first pipeline 21, and the output port of the variable frequency compressor 2 and the condensation component are connected through the second pipeline 22. The input port of the evaporation heat exchange area 12 is connected to the condensation component through the third pipeline 23; An oil return replenishing assembly 34 is provided inside the variable frequency compressor 2, wherein the oil return replenishing assembly 34 includes an oil return pipe 35 installed inside the variable frequency compressor 2, and the lubricating oil in the oil return pipe 35 is partially replaced within a preset cycle through the oil return replenishing assembly 34; A main control valve body 4 is provided on the third pipeline 23, and the connection state between the third pipeline 23 and the condensation component is controlled by the main control valve body 4; The fourth pipeline 24 is connected to the input port of the evaporation heat exchange area 12 through the third pipeline 23, and a secondary control valve body 5 is provided on the fourth pipeline 24, and the connection state between the third pipeline 23 and the fourth pipeline 24 is controlled by the secondary control valve body 5; A control module 6, wherein the control module 6 is electrically connected to the dew point temperature detection component, the variable frequency compressor 2, the condensation component, the main control valve body 4, and the auxiliary control valve body 5; The hot air is input into the precooling heat exchange area 11 from the pre-processing air input port 14, and the condensation component inputs condensed liquid toward the air-water separation area 13 through the third pipe 23. The condensed liquid and the hot air are heat-exchanged in the evaporation heat exchange area 12 to form water droplets and cooling air flow, and the water droplets enter the water storage area 15; The dew point temperature detection component detects the cooling air flow temperature. When the temperature of the dew point temperature detection component is higher than the preset temperature, the air load increases. The variable frequency compressor 2 is controlled by the control module 6 to increase the preset working frequency. The cooling capacity of the condensing component increases. The control module 6 is controlled to increase the opening amplitude of the main control valve body 4 to improve the heat exchange efficiency of the evaporation heat exchange area 12 and maintain the evaporation temperature. When the temperature of the dew point temperature detection component is lower than the preset temperature, the air load is reduced, and the frequency conversion compressor 2 is controlled to reduce the frequency through the control module 6 to match the new heat load. The opening amplitude of the main control valve body 4 is reduced by controlling the control module 6 to reduce the inflow of refrigerant. When the frequency is reduced to the minimum, the auxiliary control valve body 5 is opened by controlling the control module 6 to mix the gas in the fourth pipeline 24 with the low-temperature liquid in the third pipeline 23 to form a low-temperature gas-liquid mixture, and the evaporation temperature is raised to above zero degrees, so as to maintain the temperature of the evaporation heat exchange area 12 above zero degrees to avoid icing. The function of anti-icing and dew point stabilization is realized.

[0035] The control module 6 cooperates with the oil return supplement component 34 to extract part of the lubricating oil in the oil return pipe 35 and input an equal amount of new lubricating oil; after the replacement is completed, the oil return supplement component 34 is closed through the control module 6.

[0036] Through the cooperation of the dew point temperature detection component and the control module 6, the operating frequency of the variable frequency compressor 2 and the cooling capacity of the condensing component can be dynamically adjusted according to the actual load, avoiding unnecessary energy waste. The temperature of the gas-water separation zone 13 is monitored in real time by the dew point temperature detection component. When the temperature is higher than the preset value, the control module 6 will increase the operating frequency of the variable frequency compressor 2 and increase the flow rate of the refrigerant, thereby improving the reflux effect of the lubricating oil. At the same time, the return oil replenishment component 34 will replace part of the lubricating oil within the preset period to ensure the stability and efficiency of the lubrication system.

[0037] The accuracy requirement for the dew point temperature detection component is extremely strict. Once an error occurs in the dew point temperature detection component, it will cause the control component to misjudge the control of all subsequent related components. Therefore, in order to ensure that the dew point temperature detection component can still maintain a relatively accurate state during long-term use, a drying component is arranged around the dew point temperature detection component. The drying component intermittently flushes the dew point temperature detection component with dry airflow to maintain the sensitive state of the surface of the dew point temperature detection component, thereby ensuring that the dew point temperature detection component can still maintain a relatively accurate state during long-term use.

[0038] Due to the dynamic frequency adjustment and oil return replenishment mechanism, the wear and damage of the compressor caused by insufficient lubricating oil return is avoided, and the service life of the equipment is extended. However, when the frequency is forced to increase, it is easy to cause the temperature of the evaporation heat exchange area 12 to drop sharply, resulting in ice blockage.

[0039] By controlling the opening range of the main control valve body 4 and the auxiliary control valve body 5, the hot air output from the fourth pipe 24 is connected to the third pipe 23 and combined with the condensate, reducing the input of cooling capacity and avoiding ice blockage caused by too low temperature in the evaporation heat exchange area 12. This dynamic adjustment mechanism ensures that the evaporation heat exchange area 12 is always within the critical temperature range, which not only ensures the gas-water separation efficiency, but also avoids ice blockage.

[0040] In the prior art, the operating frequency and cooling capacity of the dryer are usually fixed and cannot be dynamically adjusted according to the actual working conditions, which easily leads to oil return difficulties, ice blockage and increased energy consumption. Through the intelligent adjustment mechanism based on dew point temperature, precise control of compressor frequency and cooling capacity is achieved, solving the above problems.

[0041] In the prior art, long-term low-frequency operation can easily damage the compressor, while forced frequency increase can cause ice blockage. The dynamic adjustment and oil return replenishment mechanism not only ensures the stable return of lubricating oil, but also avoids ice blockage, significantly extending the service life of the equipment. Compared with the prior art, the dynamic adjustment mechanism optimizes heat exchange efficiency and energy consumption, significantly reducing operating costs.

[0042] In actual applications, the dryer can be ensured to operate stably under different load conditions, avoiding shutdown failures caused by oil return difficulties or ice blockage. Through the dynamic adjustment mechanism, energy consumption is significantly reduced, meeting the requirements of energy conservation and environmental protection. As the stability of the lubrication system and the air-water separation system is improved, the maintenance frequency and cost of the equipment are significantly reduced.

[0043] Through the above-mentioned dynamic adjustment mechanism based on dew point temperature, the problems of oil return difficulty, ice blockage and increased energy consumption of existing DC variable frequency cold dryers during long-term low-frequency operation are solved. It has significant advantages such as intelligence, energy saving and high efficiency, and low maintenance cost.

[0044] The internal structure of the heat exchanger 1 is detailed. A vertical air duct 16 is provided inside the heat exchanger 1. The vertical air duct 16 is connected to the water storage area 15. The dew point temperature detection component includes a temperature sensor 7 suspended inside the air duct. The temperature sensor 7 is electrically connected to the control module 6. In this way, by providing the vertical air duct 16, the temperature sensor 7 can be placed as high as possible to avoid being affected by water vapor to a certain extent. The temperature sensor 7 can detect the gas temperature after the gas-water separation is completed.

[0045] In the cold dryer, the accuracy of the temperature sensor 7 (dew point temperature detection component) is crucial to the stable operation of the system. Although the high-positioned temperature sensor 7 can avoid interference to a certain extent, as the use time increases, impurities or water vapor will inevitably adhere to its surface, resulting in a decrease in detection accuracy. Therefore, the drying component includes a plurality of jet pipes 17 arranged around the temperature sensor 7, and the input ports above the plurality of jet pipes 17 are connected to the annular air pipe 18 above them; The input port of the annular air pipe 18 is connected to the first pipeline 21 . The input port of the annular air pipe 18 is provided with a solenoid valve switch 19 . The solenoid valve switch 19 is electrically connected to the control module 6 .

[0046] The control module 6 controls the electromagnetic valve switch 19 to start and stop within a preset period, and the gas is pressurized and ejected through the annular air pipe 18 through the jet pipe 17. The wind flows from top to bottom to clean the surface of the temperature sensor 7, thereby ensuring its accuracy.

[0047] The jet pipe 17 is tilted from top to bottom. The ratio of the diameter of the upper air inlet of the jet pipe 17 to the diameter of the lower air outlet is 3:1.

[0048] After long-term use, the surface of the temperature sensor 7 may be covered with dust, water vapor or other impurities, affecting its detection accuracy. The accuracy of the temperature sensor 7 directly affects the dynamic adjustment of the cooling capacity by the control module 6. If the sensor fails due to interference from impurities or water vapor, it may cause inaccurate adjustment of the cooling capacity, thereby affecting the stability of the system. Regularly clean the drying component to ensure that the surface of the temperature sensor 7 is always dry and clean. Regular cleaning can reduce the corrosion or damage of the sensor by impurities and water vapor, thereby extending its service life.

[0049] The jet pipe 17 is tilted from top to bottom to ensure that the wind can cover the entire surface of the temperature sensor 7 from top to bottom, and the cleaning effect is more comprehensive. The tilt angle design needs to take into account both the wind coverage range and the cleaning efficiency. In this embodiment, the tilt angle is 30°-45°, and the ratio of the diameter of the air inlet to the air outlet is (3:1).

[0050] If the diameter of the air inlet is large (the ratio of the diameter of the air outlet is 3:1), it is ensured that the wind flow has sufficient pressure and flow when entering the jet pipe 17. The diameter of the air outlet is small, and the wind flow can be concentrated and sprayed to improve the cleaning effect. This design can ensure the wind flow pressure while avoiding the wind flow dispersion caused by the air outlet being too large, resulting in poor cleaning effect.

[0051] The annular air pipe 18 connects the plurality of jet pipes 17 together to ensure that the wind flow can be evenly distributed to each jet pipe 17. The input port of the annular air pipe 18 is connected to the first pipeline 21, and the compressed air in the system is used as the cleaning air source without the need for additional energy.

[0052] The inclination angle of the air jet pipe 17 is too small (<30°), the wind flow may not cover the entire surface of the temperature sensor 7, and the cleaning effect is poor. If the inclination angle is too large (>45°), the wind flow may be too concentrated, resulting in excessive local cleaning effect and insufficient cleaning of other areas.

[0053] The ratio of the diameter of the air inlet to the air outlet. If the diameter ratio is too small (such as 2:1), the air flow pressure may be insufficient and the cleaning effect may be poor. If the diameter ratio is too large (such as 4:1), the air flow may be too dispersed and the cleaning effect may not be concentrated.

[0054] The number of the air jet pipes 17 should be determined according to the size and shape of the temperature sensor 7 to ensure that the wind flow can evenly cover the entire sensor surface. Usually, 6-8 air jet pipes 17 are set and evenly distributed around the sensor.

[0055] The electromagnetic valve switch 19 controls the switch of the wind flow input by the annular air pipe 18 to ensure that the cleaning operation is performed within a preset cycle. The electromagnetic valve switch 19 is electrically connected to the control module 6 to achieve automatic control.

[0056] The setting of the preset cycle of the solenoid valve switch 19 needs to comprehensively consider the use environment of the temperature sensor 7, the impurity adhesion speed and the system operation requirements.

[0057] Under normal working conditions, the preset cycle is to start once every 24 hours, and each cleaning lasts 10-15 seconds.

[0058] In harsh environments (such as high humidity and high dust), the control module 6 can shorten the cleaning cycle or extend the cleaning time according to the actual situation to ensure the cleaning effect. In a clean environment, the cleaning cycle can be appropriately extended to reduce energy consumption.

[0059] The condensation component includes a condenser 3 connected to the second pipe 22 and a refrigerant filter 31 connected to the condenser 3 and connected to the third pipe 23. The airflow passes through the second pipe 22 and is processed by the condenser 3 and the refrigerant filter 31 to form a condensate that is input into the evaporation heat exchange area 12.

[0060] In a DC variable frequency cold dryer, the lubricating oil of the compressor is crucial to the stable operation of the system. After long-term operation, the lubricating oil will gradually age, resulting in a decrease in the lubrication effect and even affecting the service life of the compressor. The return oil replenishing component 34 includes an oil discharge port 41 arranged in the output direction of the return oil pipe 35, an oil delivery port 42 arranged in the input direction of the return oil pipe 35, and a first control component 43 for controlling the opening / closing of the oil discharge port 41, and a second control component 44 for controlling the opening / closing of the oil delivery port 42. When the lubricating oil refluxes, the first control component 43 controls the oil discharge port 41 to be closed after opening for a preset time, and the second control component 44 controls the oil delivery port 42 to be closed after opening for a preset time, thereby discharging part of the old lubricating oil and replenishing part of the new lubricating oil.

[0061] Among them, the first control component 43 and the second control component 44 are electrically connected to the control module 6, the oil drain port 41 is externally connected to the oil drain pipeline, and the input port is externally connected to the oil delivery pipeline. The first control component 43 and the second control component 44 are both electronic valves. Among them, in this embodiment, the opening time of the oil drain port 41 and the oil delivery port 42 is 3S-5S, and 10%-15% of the lubricating oil is replaced.

[0062] Since the lubricating oil will gradually age after long-term use, its lubricating performance will decrease, affecting the operating efficiency of the compressor. Part of the lubricating oil is regularly replaced by the oil return replenishing component 34 to ensure that the lubricating oil is always in a high-quality state.

[0063] High-quality lubricants can effectively reduce compressor wear, extend its service life, and improve the overall reliability of the system. By regularly replacing some lubricants, compressor failures caused by lubricant aging can be avoided, reducing maintenance costs and downtime.

[0064] The oil discharge port 41 is arranged at the output direction of the oil return pipe 35, and is used to discharge part of the old lubricating oil. The oil delivery port 42 is arranged at the input direction of the oil return pipe 35, and is used to replenish part of the new lubricating oil. The opening / closing of the oil discharge port 41 is controlled by the first control component 43, and the opening / closing of the oil delivery port 42 is controlled by the second control component 44. Both control components are electronic valves, which are electrically connected to the control module 6 to realize automatic control.

[0065] The opening / closing time of the oil discharge port 41 and the oil delivery port 42 is designed to be 3S-5S, ensuring that the amount of lubricating oil replaced each time is 10%-15%. While ensuring the replacement effect, it can avoid lubricating oil waste or system instability caused by too long replacement time. Replacing 10%-15% of the lubricating oil each time can reduce the consumption of new lubricating oil while ensuring the quality of the lubricating oil.

[0066] The specific cycle setting needs to take into account the compressor operation time, lubricant aging rate and system operation requirements. Under normal working conditions, the preset cycle for using synthetic oil is to start once every 240-720 hours, and replace 10%-15% of the lubricant each time.

[0067] In harsh environments (such as high temperature and high humidity), the control module 6 can shorten the replacement cycle or increase the replacement ratio according to actual conditions to ensure the quality of the lubricating oil.

[0068] Regarding the replacement ratio, if the replacement ratio is too small (<10%), the quality of the lubricant may not be effectively improved, affecting the lubrication effect. If the replacement ratio is too large (>15%), it may lead to excessive consumption of new lubricant and increase maintenance costs.

[0069] The oil return replenishment component 34 realizes the regular replacement of part of the lubricating oil through the coordinated work of the oil discharge port 41, the oil delivery port 42, the first control component 43 and the second control component 44, ensuring the stability of the lubricating oil and high-quality oil return. The design of parameters such as the opening / closing time (3S-5S) and the replacement ratio (10%-15%) of the oil discharge port 41 and the oil delivery port 42 have been calculated and verified in practice, which can reduce maintenance costs while ensuring the replacement effect. Compared with the existing technology, it has significant advantages in lubricating oil maintenance, system reliability and maintenance costs, and provides reliable guarantee for the long-term stable operation of the DC variable frequency cold dryer.

[0070] In the cold dryer system, the evaporation heat exchange area 12 is a key component to ensure the output of dry air. However, during the rapid cooling process, the inner wall surface of the evaporation heat exchange area 12 is prone to ice blockage of the airway due to the freezing of condensed water, affecting the normal operation of the system. Therefore, an ice blockage cutting net assembly is provided at the airway opening connected to the first pipeline 21 on the evaporation heat exchange area 12 located above the water storage area 15. The ice blockage cutting net assembly includes a group of superimposed meshes 32, the holes on the two meshes 32 overlap, and a group of telescopic guide rod motors 33 are arranged on the opposite sides of the two meshes 32. The telescopic guide rod motors 33 are electrically connected to the control module 6. The two telescopic guide rod motors 33 drive the meshes 32 to reciprocate and tangentially move from the opposite sides of the two meshes 32, and the corresponding holes on the two meshes 32 are repeatedly displaced and overlapped.

[0071] During rapid cooling, it is inevitable that the mesh 32 that has formed an ice blockage cannot be dealt with quickly. Therefore, a telescopic guide rod motor 33 is further provided to control the two groups of meshes 32 to make tangential motion. The ice flakes on the mesh 32 are quickly broken into small ice flakes through short and high-frequency motions, and the mixed input airflow is used to achieve rapid separation, thereby ensuring that the ice blockage is quickly removed in a short time.

[0072] During the rapid cooling process, condensed water is likely to freeze on the mesh 32, forming an ice blockage, which hinders the normal passage of airflow.

[0073] The ice blockage cutting net assembly is designed to quickly break ice flakes through the tangential movement of the net 32 ​​to avoid the impact of ice blockage on system operation. Traditional deicing methods (such as heating or shutdown cleaning) are inefficient and cannot meet the needs of rapid deicing during extreme temperature drops. The ice blockage cutting net assembly can quickly remove ice blockage in a short time to ensure continuous and stable operation of the system.

[0074] The automated de-icing design reduces downtime for maintenance due to ice blockage and improves system operating efficiency.

[0075] Among them, the perforated design of the mesh 32 can effectively separate the gas-water mixture and provide a structural basis for ice blockage breaking.

[0076] The two sets of telescopic guide rod motors 33 drive the mesh 32 to move tangentially, so that the holes on the mesh 32 are repeatedly displaced and overlapped. The telescopic guide rod motor 33 is electrically connected to the control module 6 to realize automatic control. The telescopic guide rod motor 33 drives the mesh 32 to move in a short and high-frequency manner, and the ice flakes are quickly broken into small ice flakes. The broken small ice flakes are more easily melted by the input wind flow, further improving the deicing efficiency.

[0077] Through the tangential movement of the mesh 32, ice blockage can be quickly broken in a short time to ensure the normal passage of airflow. It can effectively deal with the ice blockage problem during rapid cooling and improve the response speed of the system.

[0078] The design of the ice blockage cutting net assembly realizes the rapid breaking and melting of ice blockages through the coordinated work of the superimposed mesh 32 and the telescopic guide rod motor 33, ensuring the normal operation of the air-water separation zone 13. It can quickly remove ice blockages during extreme temperature drops, improving the response speed and operating efficiency of the system. Compared with traditional heating deicing or shutdown cleaning methods, the ice blockage cutting net assembly has significant advantages such as automation, high efficiency, energy saving and extended service life, providing reliable guarantee for the long-term stable operation of the cold dryer.

[0079] In this embodiment, both the main control valve body 4 and the auxiliary control valve body 5 are electronic expansion valves.

[0080] In this embodiment, the first pipe 21, the second pipe 22, and the third pipe 23 are all copper pipes.

[0081] The inlet of the variable frequency compressor 2 is connected to the outlet of the evaporation heat exchange area 12 through the first pipe 21. An intake air temperature probe 51 is provided on the first pipe 21 and a low pressure pressure sensor 52 is installed. The outlet of the variable frequency compressor 2 is connected to the inlet of the condenser 3 through the second pipe 22, and an exhaust temperature probe 53 is provided on the second pipe 22 and a high pressure pressure sensor 54 is installed. The outlet of the condenser 3 is connected to the inlet of the refrigerant filter 31 through the third pipe 23, and a post-condensation temperature probe is installed on the third pipe 23 to detect the temperature of the cold air flowing through the third pipe 23. The outlet of the refrigerant filter 31 is connected to the inlet of the main control valve body 4 through the third pipe 23. The intake air temperature probe 51, the low pressure pressure sensor 52, the exhaust temperature probe 53, the high pressure pressure sensor 54, the automatic drain 55, and the evaporation temperature probe 56 are electrically connected to the control module 6.

[0082] The outlet of the main control valve body 4 is connected to the inlet of the evaporation heat exchange area 12 of the heat exchanger 1 through the third pipe 23. The third pipe 23 between the main control valve body 4 and the heat exchanger 1 is tied with an evaporation temperature probe 56. Downstream of the evaporation temperature probe 56, there is a fourth connecting pipe connected to the outlet of the auxiliary control valve body 5, and the inlet of the auxiliary control valve body 5 is connected to the second pipe 22. The automatic drainer 55 is connected to the bottom of the water storage area 15 for draining the stored water.

[0083] The control module 6 is electrically connected to the temperature probes and pressure sensors. Through communication signals, the frequency converter is controlled to change the operating speed and power output of the compressor. An external display may also be connected to the frequency converter to display the required temperature, pressure, compressor current, frequency and other information on the screen through communication signals.

[0084] Reference Fig. 9 As shown, a DC variable frequency energy-saving cold dryer adjustment method based on dew point temperature comprises the following steps: S1, compressed air is input into the pre-cooling heat exchange zone 11 of the heat exchanger 1 from the pre-processing air input port 14, and performs preliminary heat exchange with the condensate output by the condensation component to reduce the temperature of the compressed air.

[0085] S2, the precooling heat exchange zone 11 is working. In the precooling heat exchange zone 11, the compressed air exchanges heat with the condensed liquid, initially cools down and precipitates a small amount of water.

[0086] S21, the condensation component inputs condensed liquid into the evaporation heat exchange area 12 through the third pipe 23, and the condensed liquid and the compressed air perform heat exchange in the evaporation heat exchange area 12, further reducing the temperature of the compressed air and precipitating a large amount of water; S3, the precipitated water droplets enter the water storage area 15, the dew point temperature detection component detects the temperature of the cooling air flow in real time, and transmits the signal to the control module 6; S4, when the dew point temperature detection component detects that the temperature is within the preset threshold area, the current state is maintained; When the dew point temperature detection component detects that the temperature is higher than the preset high temperature threshold, the control module 6 determines that the air load has increased and executes step S5; When the dew point temperature detection component detects that the temperature is lower than the preset low temperature threshold, the control module 6 determines that the air load is reduced and executes step S6; S5, increase the operating frequency of the variable frequency compressor 2 and increase the supply of cooling capacity until the dew point temperature is within the preset range, the condensation capacity of the condensing component increases, the opening amplitude of the main control valve body 4 increases, and the heat exchange capacity of the evaporation heat exchange area 12 is increased; at the same time, within the preset period, the return oil replenishment component 34 is started to discharge part of the old lubricating oil and replenish an equal amount of new lubricating oil.

[0087] S6, reduce the operating frequency of the variable frequency compressor 2 to reduce the supply of cooling capacity until the dew point temperature is within the preset range, the condensation capacity of the condensing component is reduced, the opening amplitude of the main control valve body 4 is reduced accordingly, the heat exchange capacity of the evaporation heat exchange area 12 is reduced, and the return oil replenishment component 34 is closed.

[0088] In step S4, the dew point temperature refers to the temperature at which the water vapor in the air reaches saturation and begins to condense into water. The lower the dew point temperature, the less moisture in the air and the drier the air. By monitoring the dew point temperature, the dryness of the air can be understood in real time, and the system operation status can be adjusted as needed to ensure the quality of the output air.

[0089] Preset high temperature threshold: When the dew point temperature is higher than the preset high temperature threshold, the control module 6 determines that the air load is increased and executes step S5 (such as increasing the cooling power or extending the running time). The preset high temperature threshold is usually set between 2°C and 5°C.

[0090] If the threshold is set too low (<2°C), it may cause the system to respond frequently and increase energy consumption.

[0091] If the threshold is set too high (>5°C), the air drying effect may not be satisfactory.

[0092] Preset low temperature threshold: When the dew point temperature is lower than the preset low temperature threshold, the control module 6 determines that the air load is reduced and executes step S6 (such as reducing the cooling power or shortening the running time). The preset low temperature threshold is usually set between -10°C and -5°C.

[0093] If the threshold is set too low (<-10°C), it may cause the system to under-respond and waste energy.

[0094] If the threshold is set too high (>-5°C), it may cause the system to adjust frequently and affect stability.

[0095] When the dew point temperature is between the preset high and low temperature thresholds, the system maintains the current state without adjustment.

[0096] Changes in air load directly affect the dew point temperature. When the air load increases, the dew point temperature increases; when the air load decreases, the dew point temperature decreases.

[0097] By presetting thresholds, the system can adjust the operating status in real time according to changes in air load to ensure the air drying effect.

[0098] In a high humidity environment, the air load is large. It is recommended to adjust the preset high temperature threshold appropriately (such as 5°C to 8°C) to avoid frequent system responses.

[0099] In a low humidity environment, the air load is small, and it is recommended to adjust the preset low temperature threshold appropriately to a lower value (such as -15°C to -10°C) to improve energy utilization.

[0100] In step S5, the oil return replenishment is performed periodically. Within the preset period, the oil return replenishment component 34 is automatically started, the oil discharge port 41 is opened for 3-5 seconds, 10%-15% of the old lubricating oil is discharged, and the oil delivery port 42 is opened for 3-5 seconds to replenish the same amount of new lubricating oil. By dynamically managing the quality of the lubricating oil, the long-term stable operation of the compressor is guaranteed.

[0101] The preset period is 24-72 hours or a lubricating oil detection sensor is set when the lubricating oil oxidation or contamination degree is higher than 40%.

[0102] The multi-point temperature monitoring system is equipped with multiple temperature probes (such as the intake temperature probe 51, the exhaust temperature probe 53, the evaporation temperature probe 56, etc.) to monitor the temperature changes of key parts in real time.

[0103] The pressure sensor feedback low pressure sensor 52 and high pressure sensor 54 monitor the pressure changes of the compressor inlet and outlet in real time. After the data is analyzed by the control module 6, the compressor operating frequency and valve opening are adjusted.

[0104] Real-time data display can be set up. The display shows the compressor frequency, temperature, pressure and other key parameters in real time. It is convenient for operators to monitor the system operation status. When the system detects an abnormal state (such as excessive temperature, abnormal pressure, ice blockage risk, etc.), it will immediately issue an alarm and take protective measures (such as frequency reduction or shutdown).

[0105] By dynamically adjusting the energy-saving mode, the compressor frequency and the refrigeration capacity of the condensing component are dynamically adjusted through the dew point temperature feedback signal. Under the premise of meeting the process requirements, energy consumption is minimized. In addition, the service life of the equipment is effectively extended by regularly replacing the lubricating oil, preventing ice blockage and reasonably controlling the operating frequency of the compressor to extend the service life.

[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A DC variable frequency energy-saving cold dryer based on dew point temperature, characterized in that: include: A heat exchanger (1), wherein a pre-processed air input port (14) and a finished air output port (101) are arranged above the heat exchanger (1), and the heat exchanger (1) is provided with a pre-cooling heat exchange zone (11), an evaporation heat exchange zone (12), and an air-water separation zone (13) from top to bottom; A water storage area (15) is arranged below the gas-water separation area (13), and a dew point temperature detection component is arranged in a high area of ​​the water storage area (15) for detecting the temperature state of the compressed air above the water storage area (15); The input port of the variable frequency compressor (2) is connected to the evaporation heat exchange area (12) via a first pipe (21), the output port of the variable frequency compressor (2) and the condensation component are connected via a second pipe (22), and the input port of the evaporation heat exchange area (12) is connected to the condensation component via a third pipe (23); A main control valve body (4) is provided on the third pipeline (23), and the connection state between the third pipeline (23) and the condensation component is controlled by the main control valve body (4); The fourth pipeline (24) is connected to the input port of the evaporation heat exchange area (12) through the third pipeline (23); a secondary control valve body (5) is provided on the fourth pipeline (24); and the connection state between the third pipeline (23) and the fourth pipeline (24) is controlled by the secondary control valve body (5); A control module (6), wherein the control module (6) is electrically connected to the dew point temperature detection component, the variable frequency compressor (2), the condensation component, the main control valve body (4), and the auxiliary control valve body (5); The dew point temperature detection component detects the temperature of the cooling airflow; when the temperature of the dew point temperature detection component is higher than a preset temperature, the air load increases; the variable frequency compressor (2) is controlled by the control module (6) to increase the preset working frequency; the cooling capacity of the condensing component increases; the control module (6) is controlled to increase the opening amplitude of the main control valve body (4), thereby improving the heat exchange efficiency of the evaporation heat exchange zone (12) and maintaining the evaporation temperature; When the temperature of the dew point temperature detection component is lower than a preset temperature, the air load is reduced, and the control module (6) controls the variable frequency compressor (2) to reduce the frequency to match the new heat load; By controlling the control module (6) to reduce the opening amplitude of the main control valve body (4), the inflow amount of the refrigerant is reduced; When the frequency drops to the minimum, the control module (6) is controlled to open the auxiliary control valve body (5), so that the gas in the fourth pipeline (24) and the low-temperature liquid in the third pipeline (23) are mixed to form a low-temperature gas-liquid mixture, and the evaporation temperature is raised to above zero degrees, thereby maintaining the temperature of the evaporation heat exchange zone (12) above zero degrees.

2. A DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 1, characterized in that: A vertical air duct (16) is provided inside the heat exchanger (1), the vertical air duct (16) being in communication with the water storage area (15), the dew point temperature detection component comprising a temperature sensor (7) suspended inside the air duct, the temperature sensor (7) being electrically connected to the control module (6).

3. A DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 2, characterized in that: It also includes a drying component arranged around the dew point temperature detection component, through which a dry airflow is intermittently flushed toward the dew point temperature detection component to maintain a sensitive state of the surface of the dew point temperature detection component; The drying component comprises a plurality of air injection pipes (17) arranged around the temperature sensor (7), wherein the input ports above the plurality of air injection pipes (17) are connected to the annular air pipe (18) above the air injection pipes (17); The input port of the annular air pipe (18) is connected to the first pipeline (21), and the input port of the annular air pipe (18) is provided with a solenoid valve switch (19), and the solenoid valve switch (19) is electrically connected to the control module (6).

4. A DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 3, characterized in that: The control module (6) controls the electromagnetic valve switch (19) to start and stop within a preset cycle, and the gas is pressurized and ejected through the annular gas pipe (18) through the jet pipe (17), and the air flow cleans the surface of the temperature sensor (7) from top to bottom, thereby ensuring its accuracy.

5. A DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 4, characterized in that: The air injection pipe (17) is arranged to be inclined from top to bottom.

6. A DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 4, characterized in that: The ratio of the diameter of the upper air inlet of the air jet pipe (17) to the diameter of the lower air outlet is 3:

1.

7. The DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 1, characterized in that: The condensation component comprises a condenser (3) connected to a fan or external cooling water and a second pipe (22), and a refrigerant filter (31) connected to the condenser (3) and in communication with a third pipe (23). The wind flows through the second pipe (22) and is processed by the condenser (3) and the refrigerant filter (31) to form a condensate flow which is input into the evaporation heat exchange area (12).

8. The DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 1, characterized in that: It also includes an oil return replenishing assembly (34) arranged inside the variable frequency compressor (2), the oil return replenishing assembly (34) including an oil return pipe (35) installed inside the variable frequency compressor (2), and the oil return replenishing assembly (34) is used to replace part of the lubricating oil in the oil return pipe (35) within a preset cycle; The control module (6) cooperates with the oil return replenishing assembly (34) to extract a portion of the lubricating oil in the oil return pipe (35) in the output direction, and input an equal amount of new lubricating oil in the input direction of the oil return pipe (35); The return oil replenishing component (34) comprises an oil discharge port (41) arranged in the output direction of the return oil pipe (35), an oil delivery port (42) arranged in the input direction of the return oil pipe (35), a first control component (43) for controlling the opening / closing of the oil discharge port (41), and a second control component (44) for controlling the opening / closing of the oil delivery port (42). When the lubricating oil is returning, the first control component (43) controls the oil discharge port (41) to be closed after opening for a preset time, and the second control component (44) controls the oil delivery port (42) to be closed after opening for a preset time, thereby discharging part of the old lubricating oil and replenishing part of the new lubricating oil.

9. The DC variable frequency energy-saving cold dryer based on dew point temperature according to claim 1, characterized in that: An ice blocking cutting net assembly is provided at the outlet of the evaporation heat exchange zone connected to the first pipeline (21), the ice blocking cutting net assembly comprising a group of mesh sheets (32) arranged in a stacked manner, the holes on two mesh sheets (32) overlapping with the outlet airway outlet, and a group of telescopic guide rod motors (33) arranged on opposite sides of the two mesh sheets (32), the telescopic guide rod motors (33) being electrically connected to the control module (6), and the mesh sheets (32) are driven to move tangentially from opposite sides of the two mesh sheets (32) by the two telescopic guide rod motors (33), so that the corresponding holes on the two mesh sheets (32) are repeatedly displaced and overlapped.

10. A method for adjusting a DC variable frequency energy-saving cold dryer based on dew point temperature according to any one of claims 1 to 9, the steps comprising: S1, inputting the compressed air from the pre-processing air input port (14) into the pre-cooling heat exchange zone (11) of the heat exchanger (1), performing preliminary heat exchange with the condensate output by the condensation component, thereby reducing the temperature of the compressed air; S2, the precooling heat exchange zone (11) operates in the precooling heat exchange zone (11), the compressed air exchanges heat with the condensed liquid, and the condensed liquid is input into the evaporation heat exchange zone (12) through the third pipeline (23), and heat exchange is performed in the evaporation heat exchange zone (12); S3, the precipitated water droplets enter the water storage area (15), the dew point temperature detection component detects the temperature of the cooling air flow in real time, and transmits the signal to the control module (6); S4, if the dew point temperature detection component detects that the temperature is higher than the preset high temperature threshold, execute step S5; If the temperature is lower than the preset low temperature threshold, execute step S6; S5, increasing the operating frequency of the variable frequency compressor (2) to increase the supply of cooling capacity until the dew point temperature is within a preset range, the condensation capacity of the condensing component increases, the opening amplitude of the main control valve body (4) increases, and the heat exchange capacity of the evaporation heat exchange area (12) is increased; S6, reducing the operating frequency of the variable frequency compressor (2) to reduce the supply of cooling capacity until the dew point temperature is within a preset range, the condensation capacity of the condensing component is reduced, and the opening amplitude of the main control valve body (4) is correspondingly reduced, thereby reducing the heat exchange capacity of the evaporation heat exchange area (12).

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