Variable frequency cold dryer

Abstract

The application belongs to the technical field of air drying equipment, and particularly relates to a variable-frequency cold dryer, which comprises a shell, an evaporating device, a compressor, a heat dissipation device, a filtering device and a control device arranged in the shell, the evaporating device comprises fin blocks, an air inlet mechanism, an air outlet mechanism, an output mechanism, an input mechanism, a collecting mechanism and a heat preservation outer box, the surfaces of the fin blocks, the air inlet mechanism, the air outlet mechanism and the inner walls of the collecting mechanism are all covered with anti-icing coating, a plurality of first air inlets, a plurality of second air inlets, a plurality of first air outlets and a plurality of second air outlets are arranged on the fin blocks, the first air inlets are arranged at the top planes of the fin blocks in a spaced manner, and the fin blocks, the air inlet mechanism, the air outlet mechanism, the output mechanism, the input mechanism and the collecting mechanism are all located in the heat preservation outer box, and the above structure realizes ice prevention and defrosting in low temperature and extreme environment.

Description

Technical Field

[0001] This invention belongs to the technical field of air drying equipment, and particularly relates to a variable frequency refrigerated dryer. Background Technology

[0002] Variable frequency refrigerated air dryers are compressed air drying devices that precisely control cooling capacity by intelligently adjusting the compressor speed. Their core advantages lie in high efficiency, energy saving, and stable dew point. Unlike traditional fixed frequency refrigerated air dryers that frequently start and stop, they utilize variable frequency technology to monitor compressed air load changes in real time—actively reducing compressor speed to decrease energy consumption when air consumption decreases, and increasing speed to ensure drying effect when the load increases, thereby stabilizing the pressure and dew point within a precise range of ±0.5℃. This "on-demand cooling" characteristic not only saves more than 30% more energy than similar fixed frequency equipment but also reduces compressor wear during start-ups and shutdowns, extending the overall machine lifespan. It is particularly suitable for production scenarios with large fluctuations in air consumption, ensuring stable compressed air quality while achieving low-cost operation. In existing technologies, condensate contains impurities and dirt, which adhere to the automatic drain during discharge. Prolonged use can lead to blockage of the automatic drain, affecting the normal operation of the refrigerated compressed air dryer. To avoid blockage, a filter cartridge is used to filter impurities and dirt. For example, the refrigerated compressed air dryer described in application number CN202410674443.2 includes a main body, a treatment box, a filter assembly, and a dredging assembly. The treatment box is located between the water-air separator and the automatic drain, and a top of the treatment box is equipped with… The system includes an inlet connected to the drain outlet of a water-air separator, an outlet on the side wall of the treatment tank connected to an automatic drain, and a sewage outlet at the bottom. The filtration assembly comprises a filter cartridge and a drive mechanism. The filter cartridge is housed within the treatment tank, with a water storage chamber formed between its side wall and the inner wall of the tank. Multiple filter screens are circumferentially arranged on the side wall of the filter cartridge. The drive mechanism rotates the filter cartridge. The unblocking assembly includes an anti-clogging component and an opening / closing component. The anti-clogging component is located on the outer wall of the filter cartridge and is used to unclog the filter screen pores. The opening / closing component controls the opening and closing of the sewage outlet. This application can separate impurities and dirt from the condensate, reducing the possibility of clogging the automatic drain.

[0003] However, existing refrigerated dryers suffer from a technical problem: when faced with low temperatures or extreme environments, condensate in the evaporator can freeze, leading to blockages. Summary of the Invention

[0004] The purpose of this invention is to provide a variable frequency refrigerated dryer, which aims to solve the technical problem that water droplets in existing refrigerated dryers will condense into ice and block the pipes in low-temperature environments, and to achieve antifreeze and defrosting of refrigerated dryers in low-temperature and extreme environments.

[0005] To achieve the above objectives, an embodiment of the present invention provides a variable frequency refrigerated dryer, comprising a housing and an evaporation device, a compressor, a heat dissipation device, a filter device, and a control device disposed within the housing. The input and output ends of the filter device are respectively connected to the output end of the evaporation device and the input end of the compressor. The output end of the compressor is connected to the input end of the heat dissipation device, and the output end of the heat dissipation device is connected to the input end of the evaporation device. Furthermore, the evaporation device, the compressor, the heat dissipation device, and the filter device are all electrically connected to the control device. The evaporation device includes a finned block, an air inlet mechanism, an air outlet mechanism, an output mechanism, an input mechanism, a collection mechanism, and an insulated outer casing. The surface of the finned block, the inner walls of the air inlet mechanism, the air outlet mechanism, and the collection mechanism are all covered with an anti-icing coating. The finned block is provided with a plurality of first air inlets, a plurality of second air inlets, a plurality of first air outlets, and a plurality of second air outlets. The first air inlets are spaced apart on the top plane of the finned block. The air inlet mechanism is located above the finned block and is sealed above each of the first air inlets. The first air outlets and second air outlets... The first and second air inlets are arranged sequentially from top to bottom on the side of the fin block. The air outlet mechanism, the output mechanism, and the input mechanism are arranged sequentially from top to bottom on the side of the fin block. The air outlet mechanism is covered by each of the first air outlets, the output mechanism is covered by each of the second air outlets, and the input mechanism is covered by each of the second air inlets. The collection mechanism is located below the fin block to collect water droplets. The fin block, the air inlet mechanism, the air outlet mechanism, the output mechanism, the input mechanism, and the collection mechanism are all located in the insulated outer box.

[0006] Preferably, the anti-icing coating includes an anchoring layer, an anti-corrosion and water-blocking layer, a superhydrophobic layer, and a protective layer, wherein the anchoring layer, the anti-corrosion and water-blocking layer, the superhydrophobic layer, and the protective layer are arranged sequentially from bottom to top, and the anchoring layer is arranged in close contact with the surface of the fin block, the air inlet mechanism, the air outlet mechanism, and the inner wall of the collection mechanism.

[0007] Preferably, the anchoring layer is composed of modified epoxy resin, nano-SiO2, silane coupling agent, flexible curing agent and flexible additive, wherein the modified epoxy resin accounts for 62%, the nano-SiO2 accounts for 18%, the silane coupling agent accounts for 3%, the flexible curing agent accounts for 12%, and the flexible additive accounts for 5%.

[0008] Preferably, the diameter of a single particle of the nano-SiO2 is in the range of 30 nm to 50 nm.

[0009] Preferably, the anti-corrosion and water-blocking layer is composed of fluorinated polyurethane resin, nano TiO2, nano ZnO, weather-resistant additives and inert solvents, wherein the fluorinated polyurethane resin accounts for 65%, the nano TiO2 accounts for 12%, the nano ZnO accounts for 8%, the weather-resistant additives account for 5%, and the inert solvents account for 10%.

[0010] Preferably, the diameter of a single TiO2 nanoparticle ranges from 20 nm to 40 nm.

[0011] Preferably, the superhydrophobic layer is composed of fluorocarbon resin, micron-sized SiO2, nano-sized TiO2, dispersing and wetting agent, and high-boiling-point environmentally friendly solvent, wherein the fluorocarbon resin accounts for 55%, the micron-sized SiO2 accounts for 22%, the nano-sized TiO2 accounts for 13%, the dispersing and wetting agent accounts for 4%, and the high-boiling-point environmentally friendly solvent accounts for 6%.

[0012] Preferably, the diameter of the single particle of the micron-sized SiO2 ranges from 1.5 μm to 3 μm.

[0013] Preferably, the protective layer is composed of a nano-silane modifier, a nano-silica filler, a penetration leveling agent, and a diluent, wherein the nano-silane modifier accounts for 82%, the nano-silica filler accounts for 8%, the penetration leveling agent accounts for 3%, and the diluent accounts for 7%.

[0014] Preferably, the diameter of a single particle of the nano-silica filler is in the range of 10 nm to 20 nm.

[0015] The variable frequency refrigerated dryer provided in this invention has at least one of the following technical effects: The variable frequency refrigerated dryer of this application is assembled from a housing, an evaporation unit, a compressor, a heat dissipation unit, a filter unit, and a control unit. The evaporation unit is assembled from finned blocks, an air inlet mechanism, an air outlet mechanism, an output mechanism, an input mechanism, a collection mechanism, and an insulated outer casing. An anti-icing coating is applied to the surface of the finned blocks and the inner walls of the air inlet, air outlet, and collection mechanisms. Several first air inlets, several second air inlets, several first air outlets, and several second air outlets are provided on the finned blocks. The first air inlets are spaced apart on the top plane of the finned blocks, and the first air outlets, second air outlets, and second air inlets are all located on the finned blocks. The fin block has a first air outlet, a second air outlet, and a second air inlet arranged sequentially from top to bottom. The first air inlet and the second air outlet are connected, and the second air inlet and the first air outlet are also connected. During assembly, the air inlet mechanism is covered on the top of the fin block and connected to each of the first air inlets. The air outlet mechanism is covered on the side of the fin block and connected to each of the first air outlets. The air outlet mechanism is covered on the side of the fin block and connected to each of the second air outlets. The air inlet mechanism is covered on the side of the fin block and connected to each of the second air inlets. The fin block, air inlet mechanism, air outlet mechanism, air outlet mechanism, air inlet mechanism, and collecting mechanism are all located in an insulated outer box, which is then fixedly installed inside the shell. Both the intake and exhaust mechanisms extend upwards, passing through the intake and exhaust ports located at the top of the housing. The compressor, heat dissipation device, filter, and control device are all fixedly installed within the housing. The input and output ends of the filter are connected to the output mechanism and the compressor input, respectively. The compressor output is connected to the heat dissipation device input, and the heat dissipation device output is connected to the input mechanism. The airflow circulates through the heat dissipation device and finally exits through the exhaust mechanism. As the airflow enters through the intake mechanism and passes through the finned blocks, it gradually condenses into water droplets on the finned blocks, which then collect in the collection mechanism below. The airflow passes through the finned blocks, the intake mechanism, and the exhaust mechanism... The inner walls of the output, input, and collection mechanisms are covered with an anti-icing coating consisting of an anchoring layer, an anti-corrosion and water-blocking layer, a superhydrophobic layer, and a protective layer. This coating is resistant to high and low temperatures and corrosion, making it suitable for complex industrial dust and high-humidity conditions. It does not clog the micropores of the heat exchanger or affect heat exchange efficiency. It reduces frost adhesion by more than 70%, allowing slight frost to automatically detach with the airflow, significantly extending the defrosting cycle, reducing the frequency of defrosting starts, and lowering defrosting energy consumption. Simultaneously, it avoids heat exchanger corrosion and scaling problems caused by long-term frost adhesion, extending equipment lifespan. Through this structural design, the variable frequency refrigerated dryer achieves anti-icing and defrosting in low-temperature and extreme environments. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The effect of the variable frequency refrigerated dryer provided in the embodiments of the present invention Figure 2 This is an internal structural diagram of the variable frequency refrigerated dryer provided in an embodiment of the present invention.

[0018] Figure 3 This is an exploded view of the evaporation device of the variable frequency refrigerated dryer provided in an embodiment of the present invention.

[0019] Figure 4 This is a rendering of the finned block of the variable frequency refrigerated dryer provided in an embodiment of the present invention.

[0020] Figure 5 This is a cross-sectional view of the anti-icing coating of a variable frequency refrigerated dryer provided in an embodiment of the present invention.

[0021] The following are the labeling elements in the figures: 10—House casing; 11—Filter screen; 12—Air intake port 13—Air outlet 14—Fan 20—Evaporator 21—Fin block 22—Intake mechanism 23—Exhaust mechanism 24—Output mechanism 25—Input mechanism 26—Collection mechanism 27—Insulated outer casing; 30—Compressor; 40—Heating device 50—Filter device; 60—Control device; 70—Anti-icing coating 71—Anchoring layer; 72—Anti-corrosion and water-blocking layer; 73—Superhydrophobic layer 74—Protective layer 211—First air inlet 212—Second air inlet 213—First vent 214—Second vent Detailed Implementation

[0022] The embodiments of the present invention are described in detail below, and examples of these embodiments are provided in the appendix. Figures 1-5 As shown, the same or similar reference numerals throughout denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain embodiments of the invention, and should not be construed as limiting the invention.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] In the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0026] In one embodiment of the present invention, such as Figures 1-2 As shown, a variable frequency refrigerated dryer is provided, which is assembled from a housing 10, an evaporator 20, a compressor 30, a heat dissipation device 40, a filter device 50, and a control device 60. The evaporator 20, compressor 30, heat dissipation device 40, filter device 50, and control device 60 are all fixedly installed inside the housing 10. The control device 60 is electrically connected to the evaporator 20, compressor 30, heat dissipation device 40, and filter device 50 to realize control and regulation functions. For example... Figure 3As shown, the evaporation device 20 is assembled from a finned block 21 and an air intake mechanism 22, an air outlet mechanism 23, an output mechanism 24, an input mechanism 25, a collection mechanism 26, and an insulated outer casing 27 arranged around the finned block 21. Several first air intake holes 211 are spaced apart on the top of the finned block 21. The air intake mechanism 22 is fixedly installed on the top of the finned block 21 and covers each of the first air intake holes 211, allowing the air intake mechanism 22 to communicate with each of the first air intake holes 211. A first air outlet hole 213, a second air outlet hole 214, and a second air intake hole 212 are arranged on the side of the finned block 21, and these holes are arranged sequentially from top to bottom. The first air outlet hole 213, the second air outlet hole 214, and the second air intake hole 212 are all arranged intersecting with the first air intake hole 211. The air outlet mechanism 23, the output mechanism 24, the air outlet mechanism 25, the collection mechanism 26, and the insulated outer casing 27 are also arranged around the finned block 21. Both the 4 and input mechanisms 25 are fixedly installed on the side of the fin block 21. Correspondingly, the air outlet mechanism 23 covers each of the first air outlets 213 and is connected to each of the first air outlets 213. The output mechanism 24 covers each of the second air outlets 214 and is connected to each of the second air outlets 214. The input mechanism 25 covers each of the second air inlets 212 and is connected to each of the second air inlets 212. The first air inlet 211 is connected to the second air outlet 214, and the second air inlet 212 is connected to the first air outlet 213. The first air inlet 211 is set through the fin block 21 vertically, so that the first air inlet 211 is connected to the collection mechanism 26 installed below the fin block 21. The heat-insulating outer box 27 encloses the fin block 21, the air inlet mechanism 22, the air outlet mechanism 23, the output mechanism 24, the input mechanism 25, and the collection mechanism 26. Figure 2 As shown, gas is input from the intake mechanism 22 into the first intake port 211 and then output from the second outlet port 214 into the output mechanism 24 to enter the internal circulation of the refrigerated dryer. It is then input from the input mechanism 25 into the second intake port 212 for cooling and output from the first outlet port 213 to the outlet mechanism 23. Because the flow channels of the first intake port 211 and the second outlet port 214 are adjacent to the flow channels of the first outlet port 213 and the second intake port 212, the first outlet port 213 and the second outlet port 214... The air temperature in the flow channel is lower than the air temperature in the flow channels of the first air inlet 211 and the second air outlet 214. This causes water droplets to condense on the inner sidewalls of the flow channels of the first air inlet 211 and the second air outlet 214 and fall into the collection mechanism 26 below for output. The bottom outlet of the collection mechanism 26 is connected to a gas-liquid separator to separate gas and liquid. A part of the collection mechanism 26 is fixedly installed on the other side of the fin block 21 and is connected to the other end of the first air outlet 214 that penetrates the fin block 21.

[0027] like Figure 4As shown, an anti-icing coating 70 is applied to the surface of the fin block 21 and the inner walls of the air intake mechanism 22, air outlet mechanism 23, output mechanism 24, input mechanism 25, and collection mechanism 26. The anti-icing coating 70 is composed of an anchoring layer 71, a corrosion-resistant and water-blocking layer 72, a superhydrophobic layer 73, and a protective layer 74, layered sequentially from bottom to top. The thickness of the anti-icing coating 70 ranges from 25 μm to 35 μm. like Figure 5 As shown, the anchoring layer 71 is composed of 62% modified epoxy resin, 18% nano-SiO2, 3% silane coupling agent, 12% flexible curing agent, and 5% flexible additives. As an anchoring transition layer for the metal substrate, it can deeply penetrate the micropores of the evaporator aluminum fins and copper tubes, fill the fine unevenness of the metal surface, significantly improve the overall adhesion of the coating, and avoid peeling, flaking, and cracking of the coating caused by long-term hot and cold alternation. At the same time, it isolates the air from contact with the metal substrate, prevents the substrate from oxidation and electrochemical corrosion, and provides a smooth and stable adhesion base for the upper functional coating. It should be noted that the nano-SiO2 should be selected with a single particle diameter range of 30 nm to 50 nm, which is specifically used to fill the micropores of the metal and improve the density and adhesion of the primer. The thickness of the anchoring layer 71 ranges from 8 μm to 10 μm.

[0028] like Figure 5 As shown, an anti-corrosion and water-blocking layer 72 is covered above the anchoring layer 71. The anti-corrosion and water-blocking layer 72 is composed of 65% fluorine-modified polyurethane resin, 12% nano TiO2, 8% nano ZnO, 5% weather-resistant additives, and 10% inert solvent. It has extreme density and water-blocking properties, completely blocking the penetration of condensate, humid air, and acidic impurities, and preventing the coating from getting damp and blistering. It is resistant to high and low temperature alternation (-20℃ to 120℃), and is suitable for the temperature difference impact of continuous cooling and periodic defrosting of evaporators, preventing the coating from failing due to thermal expansion and contraction, and enhancing the overall anti-corrosion and anti-aging performance. It is suitable for industrial high humidity, dust, and slightly corrosive working conditions. Among them, the nano TiO2 is selected with a single particle diameter ranging from 20 nm to 40 nm. These ultra-fine nanoparticles fill the micro gaps in the coating, enhancing the water-blocking, anti-aging, and anti-corrosion performance. The thickness of the anti-corrosion and water-blocking layer 72 ranges from 10 μm to 12 μm.

[0029] like Figure 5As shown, a superhydrophobic layer 73 is covered above the anti-corrosion and water-blocking layer 72. The superhydrophobic layer 73 is composed of 55% fluorocarbon resin, 22% micron-sized SiO2, 13% nano-sized TiO2, 4% dispersing and wetting agent, and 6% high-boiling-point environmentally friendly solvent. As the core layer for preventing icing, micron-sized particles construct a rough framework, and nano-sized particles fill micropores, forming a micro-nano binary biomimetic rough structure. The low surface energy fluorocarbon resin reduces the interfacial energy and significantly reduces the surface free energy of the coating, resulting in a water contact angle ≥152° and a roll-off angle ≤5°. After condensation lands, it quickly clumps together and slides, unable to spread or freeze into ice. The adhesion between the frost layer and the coating interface is reduced by more than 70%. Slight frost can automatically fall off with the compressed air flow, inhibiting the accumulation and growth of frost layer from the source. It also has excellent anti-condensation and anti-frost crystal adhesion properties, making it suitable for long-term low-temperature heat exchange conditions in refrigerated dryers. Among them, the micron-sized SiO2 is selected with a single particle diameter ranging from 1.5μm to 3μm to construct a micron-sized rough skeleton, which is the main support of the biomimetic anti-icing structure. The thickness of the superhydrophobic layer 73 ranges from 8μm to 10μm.

[0030] like Figure 5 As shown, a protective layer 74 is covered above the superhydrophobic layer 73. The protective layer 74 is composed of 82% nano-silane modifier, 8% nano-silica filler, 3% penetration leveling agent, and 7% diluent. The transparent nano-silane wear-resistant modifier does not block the heat exchanger micropores and does not affect the heat conduction and heat exchange efficiency. The surface is dense and smooth, which can resist the erosion of industrial dust and airflow friction, and prevent the functional layer from long-term wear failure. At the same time, it has self-cleaning properties, prevents dust and impurities from accumulating and clogging the flow channels, maintains the superhydrophobic and anti-icing performance for a long time, and significantly extends the service life of the coating. The nano-silica filler is selected with a single particle diameter ranging from 10 nm to 20 nm, which fills the tiny pores on the outermost layer, seals and levels the pores, improves wear resistance, and does not damage the hydrophobic structure. The thickness of the protective layer 74 ranges from 2 μm to 3 μm.

[0031] like Figure 2 As shown, a support frame is installed below the insulated outer casing 27 to fix the evaporator 20 in the casing 10. At the same time, the air inlet mechanism 22 and the air outlet mechanism 23 are connected to the air inlet interface 12 and the air outlet interface 13 provided on the top of the casing 10. Two fans 14 with the air outlet direction facing upward are also provided on the top of the casing 10. A filter screen 11 is provided on the side of the casing 10. The heat dissipation device 40 is provided next to the filter screen 11. When the fan 14 is activated, it guides the airflow from the filter screen 11 into the heat dissipation device 40 to remove heat and then exhausts it from the top. The air flowing through the heat dissipation device 40 is cooled. A clearance hole is opened on the other side of the casing 10. The operation panel of the control device 60 is located at the clearance hole. The control device 60 is operated and adjusted through the clearance hole, thereby controlling the operation of the refrigerated dryer.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A variable frequency refrigerated dryer, characterized in that: The device includes a housing and an evaporator, a compressor, a heat dissipation device, a filter, and a control device disposed within the housing. The input and output ends of the filter are connected to the output end of the evaporator and the input end of the compressor, respectively. The output end of the compressor is connected to the input end of the heat dissipation device, and the output end of the heat dissipation device is connected to the input end of the evaporator. The evaporator, the compressor, the heat dissipation device, and the filter are all electrically connected to the control device. The evaporation device includes a finned block, an air inlet mechanism, an air outlet mechanism, an output mechanism, an input mechanism, a collection mechanism, and an insulated outer casing. The surface of the finned block, the inner walls of the air inlet mechanism, the air outlet mechanism, and the collection mechanism are all covered with an anti-icing coating. The finned block is provided with a plurality of first air inlets, a plurality of second air inlets, a plurality of first air outlets, and a plurality of second air outlets. The first air inlets are spaced apart on the top plane of the finned block. The air inlet mechanism is located above the finned block and is sealed above each of the first air inlets. The first air outlets and second air outlets... The first and second air inlets are arranged sequentially from top to bottom on the side of the fin block. The air outlet mechanism, the output mechanism, and the input mechanism are arranged sequentially from top to bottom on the side of the fin block. The air outlet mechanism is covered by each of the first air outlets, the output mechanism is covered by each of the second air outlets, and the input mechanism is covered by each of the second air inlets. The collection mechanism is located below the fin block to collect water droplets. The fin block, the air inlet mechanism, the air outlet mechanism, the output mechanism, the input mechanism, and the collection mechanism are all located in the insulated outer box.

2. The variable frequency refrigerated dryer according to claim 1, characterized in that: The anti-icing coating includes an anchoring layer, an anti-corrosion and water-blocking layer, a superhydrophobic layer, and a protective layer. The anchoring layer, the anti-corrosion and water-blocking layer, the superhydrophobic layer, and the protective layer are arranged sequentially from bottom to top. The anchoring layer is closely attached to the surface of the fin block, the air inlet mechanism, the air outlet mechanism, and the inner wall of the collection mechanism.

3. The variable frequency refrigerated dryer according to claim 2, characterized in that: The anchoring layer is composed of modified epoxy resin, nano-SiO2, silane coupling agent, flexible curing agent and flexible additives. The modified epoxy resin accounts for 62%, the nano-SiO2 accounts for 18%, the silane coupling agent accounts for 3%, the flexible curing agent accounts for 12%, and the flexible additives account for 5%.

4. The variable frequency refrigerated dryer according to claim 3, characterized in that: The diameter of the single particles of the nano-SiO2 ranges from 30 nm to 50 nm.

5. The variable frequency refrigerated dryer according to claim 2, characterized in that: The anti-corrosion and water-blocking layer is composed of fluorinated polyurethane resin, nano TiO2, nano ZnO, weather-resistant additives and inert solvents. The fluorinated polyurethane resin accounts for 65%, the nano TiO2 accounts for 12%, the nano ZnO accounts for 8%, the weather-resistant additives account for 5%, and the inert solvents account for 10%.

6. The variable frequency refrigerated dryer according to claim 5, characterized in that: The diameter of a single nano-TiO2 particle ranges from 20 nm to 40 nm.

7. The variable frequency refrigerated dryer according to claim 2, characterized in that: The superhydrophobic layer is composed of fluorocarbon resin, micron-sized SiO2, nano-sized TiO2, dispersing and wetting agent, and high-boiling-point environmentally friendly solvent. The fluorocarbon resin accounts for 55%, the micron-sized SiO2 accounts for 22%, the nano-sized TiO2 accounts for 13%, the dispersing and wetting agent accounts for 4%, and the high-boiling-point environmentally friendly solvent accounts for 6%.

8. The variable frequency refrigerated dryer according to claim 7, characterized in that: The diameter of the single particle of the micron-sized SiO2 ranges from 1.5 μm to 3 μm.

9. The variable frequency refrigerated dryer according to claim 2, characterized in that: The protective layer is composed of a nano-silane modifier, a nano-silica filler, a penetration leveling agent, and a diluent, wherein the nano-silane modifier accounts for 82%, the nano-silica filler accounts for 8%, the penetration leveling agent accounts for 3%, and the diluent accounts for 7%.

10. The variable frequency refrigerated dryer according to claim 9, characterized in that: The diameter of a single particle of the nano-silica filler ranges from 10 nm to 20 nm.

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