Machining method for efficient defrosting fin type heat exchanger of air source heat pump

Abstract

The invention discloses a machining method for an efficient defrosting fin heat exchanger of an air source heat pump. The machining method comprises the following steps that a machining system for the efficient defrosting fin heat exchanger of the air source heat pump is constructed; performing surface treatment on the fin type heat exchanger; preparing a hydrophobic coating on the surface of the fin heat exchanger; and a hydrophilic and hydrophobic spacing layer is arranged, and super-lubrication treatment is carried out. According to the technical scheme, the defrosting fins of the air source heat pump are subjected to surface coating machining, the hydrophilic and hydrophobic spacing layer is arranged on the surface of the fin heat exchanger, the super-lubricating solution covers the surface of the fin heat exchanger, and therefore the passive frost restraining performance of the heat exchanger is improved, and the defrosting duration of the heat exchanger is shortened; the air source heat pump defrosting fin surface coating machining process is safe, reliable, efficient and stable.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, and in particular to a method for processing an air source heat pump high-efficiency defrosting fin heat exchanger. Background Art

[0002] With the rapid development of air source heat pump technology, a large number of air source water heaters and air source air conditioners have entered the market. When traditional water-cooled chillers are heating indoors, they cannot operate normally in winter, especially when the outdoor air temperature is below 0 degrees Celsius. The air source heat pump system absorbs heat from the air through the outdoor heat exchanger to ensure that the air source heat pump system can heat the indoors normally in winter. Although the traditional air source heat pump system can heat indoors in winter, its operation often reduces its heating effect due to frequent frost and ice on the surface of the outdoor unit's heat exchanger. Even in some low temperature and high humidity environments in the south, the air source heat pump system cannot operate normally, which greatly restricts the promotion and use of air source heat pumps.

[0003] According to data, the method for frosting the outdoor unit heat exchanger in most commercial air source heat pump systems is to use the reverse cycle method. By reversing the four-way valve, the outdoor heat exchanger is used as a condenser and the indoor heat exchanger is used as an evaporator. During the defrosting process, the high-temperature refrigerant flows into the outdoor coil to melt the frost on the surface of the outdoor heat exchanger. This method has high energy consumption and also reduces indoor comfort. Heat exchanger coating technology can be used as a means of passive frost suppression to extend the time of frosting. At the same time, super-hydrophobic, super-hydrophilic, super-lubricating and other coating technologies can reduce the energy consumption of defrosting when the heat pump is defrosted.

[0004] Chinese patent document CN1710370A discloses a "fin with zinc oxide whisker active agent coating and its processing method". The aluminum foil surface of the fin has an anti-corrosion base layer, and a zinc oxide whisker active layer is coated on the anti-corrosion base layer. The zinc oxide whisker active layer contains a hydrophilic agent and a whisker active agent. Summary of the invention

[0005] The present invention mainly solves the original technical problems and provides a method for processing an air source heat pump high-efficiency defrosting fin heat exchanger. The air source heat pump defrosting fin is subjected to surface coating processing. A hydrophilic and hydrophobic spacer layer is arranged on the surface of the fin heat exchanger and covered with a super-lubricating solution, thereby improving the passive frost suppression performance of the heat exchanger and reducing the defrosting time of the heat exchanger. A fin heat exchanger processing system is provided, so that the surface coating processing process of the air source heat pump defrosting fin is safe, reliable, efficient and stable.

[0006] The above technical problems of the present invention are mainly solved by the following technical solutions: The present invention comprises the following steps: S1 constructing an air source heat pump high-efficiency defrosting fin heat exchanger processing system; S2 performs surface treatment on the fin heat exchanger; S3 prepares a hydrophobic coating on the surface of the fin heat exchanger; S4 sets a hydrophilic and hydrophobic spacer layer and performs super lubrication treatment.

[0007] Preferably, the air source heat pump high-efficiency defrosting fin heat exchanger processing system in step S1 includes a fin heat exchanger cleaning device and a hydrophobic coating preparation device, and also includes a super-lubricating treatment device. The fin heat exchanger cleaning device includes a deionized water ultrasonic cleaning box, an ethanol ultrasonic cleaning box, an isopropyl alcohol ultrasonic cleaning box, a sodium hydroxide heating treatment box, and a deionized water heating treatment box; the hydrophobic coating preparation device includes a chemical meteorological deposition treatment box, a customized oven, and a laser cleaning machine; the super-lubricating treatment device includes a super-lubricating treatment box and a customized vacuum box.

[0008] Each processing device can be used independently. Each processing device, including deionized water ultrasonic cleaning box, ethanol ultrasonic cleaning box, isopropyl alcohol ultrasonic cleaning box, sodium hydroxide heating treatment box, deionized water heating treatment box, chemical vapor deposition treatment box, customized oven, super lubrication treatment box and customized vacuum box, is customized in size to fit the fin heat exchanger of the commercial heat pump system and is equipped with fixed universal wheels for easy movement.

[0009] The deionized water ultrasonic cleaning box, ethanol ultrasonic cleaning box, isopropanol ultrasonic cleaning box, sodium hydroxide heating treatment box, deionized water heating treatment box, chemical meteorological deposition treatment box and super-lubricating treatment box are all equipped with inlet and outlet pipes at the bottom of the box to facilitate the inlet and outlet of the solution during processing.

[0010] The deionized water ultrasonic cleaning box, the ethanol ultrasonic cleaning box and the isopropanol ultrasonic cleaning box have holes reserved at the top cover plate for connecting the ultrasonic vibrator for ultrasonic cleaning. Preferably, the three processing devices are all equipped with an ultrasonic vibrator of suitable length.

[0011] The sodium hydroxide heating treatment box and the deionized water heating treatment box have holes reserved on the top cover for connecting the electric heating equipment in the box and for the need of artificial water addition. The two experimental equipment are equipped with surface insulation materials and grounding wire interfaces to prevent electric shock.

[0012] The chemical vapor deposition treatment box 006 adopts a "V"-shaped bottom structure at the bottom of the container to facilitate chemical vapor deposition treatment.

[0013] Preferably, the step S2 comprises cleaning the surface of the fin heat exchanger: S2.1 Use deionized water that has been used to immerse the treated fin heat exchanger to perform ultrasonic cleaning for 10-30 minutes in a deionized water ultrasonic cleaning box and dry for 10-30 minutes; S2.2 Use ethanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 10-30 minutes in the ethanol ultrasonic cleaning box 002 and dry for 10-30 minutes; S2.3 In the isopropanol ultrasonic cleaning box 003, use isopropanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 10-30 minutes and dry for 10-30 minutes.

[0014] Preferably, the step S2 further comprises heating the fin heat exchanger in a sodium hydroxide heating treatment box at 80 degrees Celsius for 5 to 20 minutes using a 10% to 40% sodium hydroxide solution in which the fin heat exchanger to be treated is immersed and drying for 10 to 30 minutes.

[0015] Preferably, the step S2 further comprises: performing a heating treatment at 90 degrees Celsius for 3-6 hours in a deionized water heating treatment box using deionized water in which the treated fin heat exchanger is immersed, and drying for 30-60 minutes.

[0016] Preferably, the step S3 specifically includes placing the treated fin heat exchanger and the hydrophobic coating preparation solution into a chemical deposition treatment box. The required amount of solution is proportional to the heat exchange area of ​​the fin heat exchanger, and the required amount of solution is 40 ml per square meter.

[0017] Preferably, the chemical deposition treatment box is placed in an oven to perform chemical vapor deposition treatment at 85 degrees Celsius for 12-24 hours and dried for 30-60 minutes.

[0018] Preferably, the hydrophobic coating preparation solution comprises: 5% concentration of trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane toluene solution / 2% concentration of n-hexadecyltrimethoxysilane ethanol solution / 2% concentration of 1H, 1H, 2H, 2H-perfluorodecyltriethoxysilane ethanol solution / tridecafluoro-1, 1, 2, 2-tetrahydrooctyl-1-trichlorosilane pure solution.

[0019] Preferably, the step S4 of setting the hydrophilic and hydrophobic spacer layer specifically includes removing part of the hydrophobic layer of the processed fin heat exchanger with a laser cleaning machine, so that the hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are evenly spaced and distributed laterally or vertically. The hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are distributed laterally or vertically at intervals of 1mm / 5mm / 1cm. Through previous experimental tests, it was found that the hydrophilic and hydrophobic spacer layer has a shorter defrosting time than the super hydrophobic surface. During the defrosting process, the frost layer / ice layer at the contact point between the hydrophobic layer and the fin heat exchanger will be removed first, so that an arched frost layer / ice layer is generated between the hydrophobic layer and the adjacent hydrophilic layer, and the hydrophobic layer frost layer / ice layer and the hydrophilic layer frost layer / ice layer will produce an interaction force to accelerate the defrosting process.

[0020] Preferably, the step S4 of superlubrication treatment specifically includes immersing the fin heat exchanger in the superlubrication preparation solution and placing it in a vacuum box at 70 degrees Celsius and 100 Pa for 3-6 hours. The superlubrication preparation solution includes a pure silicone oil solution / a pure lubricating oil solution / a pure grease solution; the treated fin heat exchanger is first placed vertically for 30-60 minutes, and then placed horizontally for 30-60 minutes, so that the superlubrication preparation solution fills the microscopic fine structure on the surface of the fin heat exchanger to form a lubricating liquid layer, thereby avoiding the intrusion of the fluid.

[0021] The beneficial effects of the present invention are: surface coating processing is performed on the defrost fins of an air source heat pump, and a hydrophilic and hydrophobic spacer layer is arranged on the surface of the fin heat exchanger and covered with a super-lubricating solution, so as to improve the passive frost suppression performance of the heat exchanger and reduce the defrost time of the heat exchanger, and an air source heat pump defrost fin processing system is arranged, so that the surface coating processing process of the air source heat pump defrost fin is safe, reliable, efficient and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the present invention.

[0023] Figure 2 This is a diagram of a defrosting fin processing system for an air source heat pump according to the present invention.

[0024] Figure 3 It is a schematic diagram of the overall process of processing an air source heat pump defrosting fin according to the present invention.

[0025] Figure 4 It is a schematic diagram of the processing principle of an air source heat pump defrosting fin of the present invention.

[0026] In the figure, 001 is a deionized water ultrasonic cleaning box, 002 is an ethanol ultrasonic cleaning box, 003 isopropanol ultrasonic cleaning box, 004 isocyanate heating treatment box, 005 isocyanate heating treatment box, 006 isocyanate chemical deposition treatment box, 007 isocyanate drying box, 008 isocyanate laser cleaning machine, 009 isocyanate superlubrication treatment box, 010 isocyanate vacuum box. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the technical solutions of the present application are further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific implementation method described here is only an optimal embodiment of the present application, which is only used to explain the present application and does not limit the protection scope of the present application. All other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] At present, the method for frosting the outdoor unit heat exchanger in most commercial air source heat pump systems is to use the reverse cycle method. By reversing the four-way valve, the outdoor heat exchanger is used as a condenser and the indoor heat exchanger is used as an evaporator. During the defrosting process, the high-temperature refrigerant flows into the outdoor coil to melt the frost on the surface of the outdoor heat exchanger. This method has high energy consumption and also reduces indoor comfort. Heat exchanger coating technology can be used as a means of passive frost suppression to extend the time of frosting. At the same time, super-hydrophobic, super-hydrophilic, super-lubricating and other coating technologies can reduce the energy consumption of defrosting when the heat pump is defrosted.

[0029] Yang Zhou et al. established an experimental method for super-hydrophobicizing aluminum foil. By ultrasonically cleaning aluminum foil, heating it, and finally treating it with chemical vapor deposition, a super-hydrophobic ultra-thin surface with good durability was generated on the surface of the aluminum foil. Kalyan Boyina et al. used a similar method to hydrophobize a miniature fin heat exchanger, and obtained a heat exchanger with better heat transfer performance and shorter defrosting time. However, after multiple ice-melting cycles, this type of super-hydrophobic surface will experience severe wear and pinning of fluids, causing the super-hydrophobic surface to fail to self-clean, frost / ice accelerated accumulation, reduced heat transfer efficiency, surface contamination and other problems. The efficient defrosting fin heat exchanger introduces a lubricating liquid layer on the basis of super-hydrophobic and super-hydrophilic spacer coatings, which accelerates the defrosting time, fills the microscopic fine structure on the surface of the fin heat exchanger, avoids the intrusion of fluids, and also reduces wear.

[0030] Related literature includes: "A simple way to fabricate an aluminum sheet with superhydrophobic and self-cleaning properties" by Yang Zhou, Wu Yi-Zhi et al., published in Chinese Phys. B 21.12 (2012): 126801.; "Condensation frosting on meter-scale superhydrophobic and superhydrophilic heat exchangers" by Boyina, Kalyan S. et al., published in International Journal of Heat and Mass Transfer 145 (2019): 118694.

[0031] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the operations (or steps) as sequential processes, many of the operations (or steps) therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the drawings; the process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0032] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0033] Embodiment: A method for processing an air source heat pump high-efficiency defrosting fin heat exchanger in this embodiment, such as Figure 1 As shown, the following steps are included: S1 builds a high-efficiency defrosting fin heat exchanger processing system for air source heat pumps.

[0034] The air source heat pump high-efficiency defrosting fin heat exchanger processing system includes a fin heat exchanger cleaning device and a hydrophobic coating preparation device, and also includes a super-lubricating treatment device. The fin heat exchanger cleaning device includes a deionized water ultrasonic cleaning box 001, an ethanol ultrasonic cleaning box 002, an isopropyl alcohol ultrasonic cleaning box 003, a sodium hydroxide heating treatment box 004, and a deionized water heating treatment box 005; the hydrophobic coating preparation device includes a chemical meteorological deposition treatment box 006, a customized oven 007, and a laser cleaning machine 008; the super-lubricating treatment device includes a super-lubricating treatment box 009 and a customized vacuum box 010.

[0035] Each processing device can be used independently. Each processing device, including deionized water ultrasonic cleaning box 001, ethanol ultrasonic cleaning box 002, isopropyl alcohol ultrasonic cleaning box 003, sodium hydroxide heating treatment box 004, deionized water heating treatment box 005, chemical vapor deposition treatment box 006, customized oven 007, super lubrication treatment box 009 and customized vacuum box 010, is customized in appropriate size to fit the fin heat exchanger of the commercial heat pump system and is equipped with fixed universal wheels for easy movement.

[0036] Deionized water ultrasonic cleaning box 001, ethanol ultrasonic cleaning box 002, isopropyl alcohol ultrasonic cleaning box 003, sodium hydroxide heating treatment box 004, deionized water heating treatment box 005, chemical meteorological deposition treatment box 006 and super-lubrication treatment box 009 are all equipped with inlet and outlet pipes at the bottom of the box to facilitate the entry and exit of the solution during processing.

[0037] The deionized water ultrasonic cleaning box 001, the ethanol ultrasonic cleaning box 002 and the isopropyl alcohol ultrasonic cleaning box 003 have holes reserved at the top cover plate for connecting the ultrasonic vibrator for ultrasonic cleaning. Preferably, the three processing devices are all equipped with ultrasonic vibrators of appropriate length.

[0038] The sodium hydroxide heating treatment box 004 and the deionized water heating treatment box 005 have holes reserved on the top cover for connecting the electric heating equipment in the box and for the need of artificial water addition. The two experimental equipment are equipped with surface insulation materials and grounding wire interfaces to prevent electric shock.

[0039] The chemical vapor deposition treatment box 006 adopts a "V"-shaped bottom structure at the bottom of the container to facilitate chemical vapor deposition treatment.

[0040] S2 performs surface treatment of fin heat exchangers, including surface cleaning of fin heat exchangers: S2.1 Use deionized water that has been used to immerse the treated fin heat exchanger to perform ultrasonic cleaning for 10-30 minutes in a deionized water ultrasonic cleaning box and dry for 10-30 minutes; S2.2 Use ethanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 10-30 minutes in the ethanol ultrasonic cleaning box 002 and dry for 10-30 minutes; S2.3 In the isopropanol ultrasonic cleaning box 003, use isopropanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 10-30 minutes and dry for 10-30 minutes.

[0041] The method further comprises heating the fin heat exchanger in a sodium hydroxide heating treatment box for 5 to 20 minutes at 80 degrees Celsius using a sodium hydroxide solution having a concentration of 10% to 40% and drying the fin heat exchanger for 10 to 30 minutes. The method further comprises heating the fin heat exchanger in a deionized water heating treatment box for 3 to 6 hours at 90 degrees Celsius using deionized water having the fin heat exchanger for 30 to 60 minutes.

[0042] S3: Prepare a hydrophobic coating on the surface of the fin heat exchanger. Put the treated fin heat exchanger and an appropriate amount of hydrophobic coating preparation solution (5% concentration of trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane toluene solution / 2% concentration of n-hexadecyl trimethoxysilane ethanol solution / 2% concentration of 1H, 1H, 2H, 2H-perfluorodecyl triethoxysilane ethanol solution / tridecafluoro-1, 1, 2, 2-tetrahydrooctyl-1-trichlorosilane pure solution) into the chemical deposition treatment box 006.

[0043] Through the previous laboratory test, we found that the required amount of solution is proportional to the heat exchange area of ​​the fin heat exchanger, and the required amount of solution is 40 ml per square meter. The chemical deposition treatment box 006 storing the treated fin heat exchanger and the reaction solution is placed in the custom oven 007 at 85 degrees Celsius for 12-24 hours of chemical vapor deposition treatment and dried for 30-60 minutes; S4 sets a hydrophilic and hydrophobic spacer layer and performs super-lubrication treatment. Setting the hydrophilic and hydrophobic spacer layer specifically includes removing part of the hydrophobic layer of the treated fin heat exchanger with a laser cleaning machine, so that the hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are evenly spaced and distributed laterally or vertically. The hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are distributed laterally or vertically at intervals of 1mm / 5mm / 1cm. Previous experimental tests have found that the hydrophilic and hydrophobic spacer layer will have a shorter defrosting time than the super-hydrophobic surface. During the defrosting process, the frost layer / ice layer at the contact point between the hydrophobic layer and the fin heat exchanger will be removed first, so that an arched frost layer / ice layer is generated between the hydrophobic layer and the adjacent hydrophilic layer, and the hydrophobic layer frost layer / ice layer and the hydrophilic layer frost layer / ice layer will produce an interaction force to accelerate the defrosting process.

[0044] The super-lubrication treatment specifically includes immersing the fin heat exchanger in the super-lubrication preparation solution and placing it in a vacuum box at 70 degrees Celsius and 100Pa for 3-6 hours. The super-lubrication preparation solution includes pure silicone oil solution / pure lubricating oil solution / pure grease solution; the treated fin heat exchanger is first placed vertically for 30-60 minutes, and then placed horizontally for 30-60 minutes, so that the super-lubrication preparation solution fills the microscopic fine structure on the surface of the fin heat exchanger, forming a lubricating liquid layer, and avoiding the intrusion of the fluid.

[0045] Embodiment 1: like Figure 1 As shown, the processing of the air source heat pump high-efficiency defrosting fin heat exchanger is to first remove the stains and irregular oxide layer on the surface of the fin heat exchanger; then use the reaction of water and pure aluminum at high temperature to generate a nano-scale regular aluminum oxide layer; then use chemical meteorological deposition reaction to connect the aluminum oxide nanolayer and the silane coating to generate a super-hydrophobic coating; then use laser to remove part of the hydrophobic coating so that the hydrophilic and hydrophobic layers are evenly distributed at a certain interval; finally, the processing of the air source heat pump high-efficiency defrosting fin heat exchanger is achieved by squeezing the super-lubricating solution into the gaps of the nanolayer on the surface of the heat exchanger under a vacuum environment.

[0046] A set of air source heat pump high efficiency defrosting fin heat exchanger processing equipment, such as Figure 2 As shown, deionized water ultrasonic cleaning box 001, ethanol ultrasonic cleaning box 002, isopropyl alcohol ultrasonic cleaning box 003, sodium hydroxide heating treatment box 004, deionized water heating treatment box 005, chemical meteorological deposition treatment box 006, customized oven 007, laser cleaning machine 008, super lubrication treatment box 009 and customized vacuum box 010.

[0047] For the 604*190*451mm aluminum foil heat exchanger, each processing device is individually customized and designed for the fin heat exchanger of this size: customized deionized water ultrasonic cleaning box 001, ethanol ultrasonic cleaning box 002, isopropyl alcohol ultrasonic cleaning box 003, sodium hydroxide heating treatment box 004 and deionized water heating treatment box 005 with dimensions of 960*960*250mm; chemical meteorological deposition treatment box 006 with dimensions of 1030*1010*250mm; customized oven 007 with a space of 1500*1200*1000mm inside the box; handheld laser cleaning machine 008 with a power of 1.4kW; high-efficiency defrost treatment box 009 with dimensions of 960*500*250mm; customized vacuum box 010 with a space of 1100*600mm*600mm inside the box. Each processing device is equipped with a set of four fixed CD-60-F Forma wheels on the bottom plate of the box for easy movement. Among them, each experimental device except the customized oven 007 and the customized vacuum box 010 is customized as a processing device with a box thickness of 5mm using 304 stainless steel and a stainless steel drain valve with a diameter of 5mm is installed on the lower side of the box. Among them, the deionized water ultrasonic cleaning box 001, the ethanol ultrasonic cleaning box 002, and the isopropyl alcohol ultrasonic cleaning box 003 have reserved a hole with a diameter of 52mm on the top cover for connecting the ultrasonic vibrator for ultrasonic cleaning, and these three processing devices are equipped with Kangmeng's KM-106, 750W power and 780MM long ultrasonic vibrator. Figure 2 Figure 002 shows the processing device in the process of ethanol ultrasonic cleaning. Among them, the sodium hydroxide heating treatment box 004 and the deionized water heating treatment box 005 are pasted with thermal insulation cotton on the outside of the box for rapid heating and heat preservation, and are welded with grounding studs and equipped with two 15kW, DN80*800mm flange heating pipes made of 304 stainless steel to meet the heating processing requirements. Figure 2 005 in the figure shows the processing device in the process of water boiling heating treatment. Among them, the chemical vapor deposition treatment box 006 adopts a "V"-shaped bottom structure at the bottom of the container to facilitate chemical vapor deposition treatment. Figure 2 006 and 007 show the chemical vapor deposition treatment of the treated heat exchanger. Figure 2 Figure 008 shows a model of a laser cleaning machine. Figure 2 Figures 009 and 010 show the preparation of surface coating for efficient defrosting of the treated heat exchanger.

[0048] Embodiment 2: A set of overall process flow for processing air source heat pump high-efficiency defrosting fin heat exchanger, for 604*190*451mm aluminum foil heat exchanger, such as Figure 3 , Figure 4As shown, including: Step 1, in a deionized water ultrasonic cleaning box 001, use deionized water that has been immersed in the treated fin heat exchanger to perform ultrasonic cleaning for 20 minutes and dry for 20 minutes; Step 2, in the ethanol ultrasonic cleaning box 002, use ethanol that has been immersed in the treated fin heat exchanger to perform ultrasonic cleaning for 20 minutes and dry for 20 minutes; Step 3, in the isopropanol ultrasonic cleaning box 003, use the isopropanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 20 minutes and dry for 20 minutes; Step 4: In the sodium hydroxide heating treatment box 004, a 10% sodium hydroxide solution that has been immersed in the treated fin heat exchanger is heated at 80 degrees Celsius for 5 minutes and dried for 20 minutes; wherein the solution used is Aladdin S111498 sodium hydroxide, AR, 96%; Step 5: In the deionized water heating treatment box 005, the deionized water used to immerse the treated fin heat exchanger is used for heating treatment at 90 degrees Celsius for 3 hours and dried for 30 minutes; Step 6, place the treated fin heat exchanger and 222 ml of 2% concentration of hexadecyltrimethoxysilane ethanol solution into the chemical deposition treatment box 006; wherein the solute used is Aladdin H106567 hexadecyltrimethoxysilane, and the solvent is Aladdin E111992 ethanol; The heat exchange area of ​​the fin heat exchanger is 5.56 square meters, so the selected solution volume is 222 ml.

[0049] Step 7, the chemical deposition treatment box 006 storing the treated fin heat exchanger and the reaction solution is subjected to chemical vapor deposition treatment at 85 degrees Celsius for 12 hours in a custom oven 007 and dried for 30 minutes; Step 8: Use a laser cleaning machine 008 to remove part of the hydrophobic layer of the processed fin heat exchanger, so that the hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are distributed longitudinally at intervals of 1 cm.

[0050] Step 9: Immerse the treated fin heat exchanger in a pure lubricating oil solution (120 L) and place it in a super-lubricating treatment box 009, wherein the lubricating oil used is GPL 100.

[0051] Step 10: Place the super-lubricity treatment box 009 storing the treated fin heat exchanger and the super-lubricity preparation solution in a customized vacuum box 010 at 70 degrees Celsius and 100 Pa for 3 hours.

[0052] Step 11: Place the treated fin heat exchanger vertically for 30 minutes and then horizontally for 30 minutes.

[0053] The air source heat pump high-efficiency defrosting fin heat exchanger of the present invention has good passive frost suppression performance after processing and reduces the defrosting time of the heat exchanger, which is described as follows: The above-mentioned air source heat pump fin heat exchanger was installed in Midea RSJF-V33 / RN8-X1-200-(E1) heat pump water heater before and after high-efficiency defrosting. Under the ambient dry-bulb / wet-bulb temperature of -20℃ / -20.16℃ (the experiment was carried out under static conditions), the frost start time of the fin heat exchanger was 30min and 50min respectively, the defrost start time was 90min and 130min (the heat pump system automatically defrosts when the frost amount makes the ring-wing difference exceed 25 degrees), the complete defrost time was 3min and 2min respectively, and a complete frosting and defrosting cycle was 123min and 182min; the frosting start time was delayed by 66%, the defrost start time was extended by 44%, the complete defrost time was reduced by 33%, and the number of frosting times in 24h continuous operation per day was reduced from 11.7 times to 7.91 times. The application of the air source heat pump high-efficiency defrosting fin heat exchanger has a good passive frost suppression performance and reduces the defrost time of the heat exchanger.

[0054] Embodiment 3: A set of overall process flow for processing air source heat pump high-efficiency defrosting fin heat exchanger, for 604*190*451mm aluminum foil heat exchanger, such as Figure 3 , Figure 4 As shown, including: Step 1, in a deionized water ultrasonic cleaning box 001, use deionized water that has been immersed in the treated fin heat exchanger to perform ultrasonic cleaning for 20 minutes and dry for 20 minutes; Step 2, in the ethanol ultrasonic cleaning box 002, use ethanol that has been immersed in the treated fin heat exchanger to perform ultrasonic cleaning for 20 minutes and dry for 20 minutes; Step 3, in the isopropanol ultrasonic cleaning box 003, use the isopropanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 20 minutes and dry for 20 minutes; Step 4: In the sodium hydroxide heating treatment box 004, a 20% sodium hydroxide solution that has been immersed in the treated fin heat exchanger is heated at 80 degrees Celsius for 10 minutes and dried for 30 minutes; wherein the solution used is Aladdin S111498 sodium hydroxide, AR, 96%; Step 5: In the deionized water heating treatment box 005, the deionized water used to immerse the treated fin heat exchanger is used for heating treatment at 90 degrees Celsius for 6 hours and dried for 30 minutes; Step 6, place the treated fin heat exchanger and 222 ml of 5% concentration trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane toluene solution into the chemical deposition treatment box 006; the solute used is Aladdin T122345 trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane, 98%, and the solvent is Aladdin T477370 toluene; The heat exchange area of ​​the fin heat exchanger is 5.56 square meters, so the selected solution volume is 222 ml.

[0055] Step 7, the chemical deposition treatment box 006 storing the treated fin heat exchanger and the reaction solution is subjected to chemical vapor deposition treatment at 85 degrees Celsius for 20 hours in a custom oven 007 and dried for 30 minutes; Step 8: Use a laser cleaning machine 008 to remove part of the hydrophobic layer of the processed fin heat exchanger, so that the hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are distributed longitudinally at intervals of 5 mm.

[0056] Step 9: Immerse the treated fin heat exchanger in a pure silicone oil solution (120 L) and place it in a high-efficiency defrost treatment box 009, wherein the silicone oil used is Aladdin S433162.

[0057] Step 10: Place the high-efficiency defrost treatment box 009 storing the processed fin heat exchanger and the high-efficiency defrost preparation leaf moistening in a customized vacuum box 010 at 70 degrees Celsius and 100 Pa for 6 hours.

[0058] Step 11: Place the treated fin heat exchanger vertically for 30 minutes and then horizontally for 30 minutes.

[0059] The air source heat pump high-efficiency defrosting fin heat exchanger of the present invention has good passive frost suppression performance after processing and reduces the defrosting time of the heat exchanger, which is described as follows: The above-mentioned air source heat pump fin heat exchanger was installed in Midea RSJF-V33 / RN8-X1-200-(E1) heat pump water heater before and after high-efficiency defrosting. Under the ambient dry-bulb / wet-bulb temperature of -20℃ / -20.16℃ (the experiment was carried out under static conditions), the frost start time of the fin heat exchanger was 30min and 70min respectively, the defrost start time was 90min and 200min (the heat pump system automatically defrosts when the frost amount makes the ring-wing difference exceed 25 degrees), the complete defrost time was 3min and 1min respectively, and a complete frosting and defrosting cycle was 123min and 271min; the frosting start time was delayed by 133%, the defrost start time was extended by 122%, the complete defrost time was reduced by 66%, and the number of frosting times in 24h continuous operation per day was reduced from 11.7 times to 5.31 times. The application of the air source heat pump high-efficiency defrosting fin heat exchanger has a good passive frost suppression performance and reduces the defrost time of the heat exchanger.

[0060] The specific embodiments described herein are merely examples of the spirit of the present invention. The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that a technician in the technical field to which the present application belongs may make various modifications or supplements to the described specific embodiments or replace them in a similar manner, but will not deviate from the spirit of the present application or exceed the scope defined in the attached claims. For a person of ordinary skill in the art, multiple variations and improvements may also be made without departing from the concept of the present application. Therefore, the scope of protection of this patent shall be subject to the attached claims.

Claims

1. A method for processing an air source heat pump high-efficiency defrosting fin heat exchanger, characterized in that: The following steps are involved: S1 builds a high-efficiency defrosting fin heat exchanger processing system for air source heat pumps; S2 performs surface treatment on the fin heat exchanger; S3 prepares a hydrophobic coating on the surface of the fin heat exchanger; S4 sets a hydrophilic and hydrophobic spacer layer and performs super lubrication treatment.

2. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 1, characterized in that: The air source heat pump high-efficiency defrosting fin heat exchanger processing system in step S1 includes a fin heat exchanger cleaning device and a hydrophobic coating preparation device, and also includes a super lubrication treatment device.

3. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 1, characterized in that: The step S2 includes cleaning the surface of the fin heat exchanger: S2.1 Use deionized water that has been used to immerse the treated fin heat exchanger to perform ultrasonic cleaning for 10-30 minutes in a deionized water ultrasonic cleaning box and dry for 10-30 minutes; S2.2 Use ethanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 10-30 minutes in the ethanol ultrasonic cleaning box 002 and dry for 10-30 minutes; S2.3 In the isopropanol ultrasonic cleaning box 003, use isopropanol in which the treated fin heat exchanger is immersed to perform ultrasonic cleaning for 10-30 minutes and dry for 10-30 minutes.

4. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 3, characterized in that: The step S2 further comprises heating the fin heat exchanger in a sodium hydroxide heating treatment box at 80 degrees Celsius for 5 to 20 minutes using a 10% to 40% sodium hydroxide solution in which the fin heat exchanger to be treated is immersed and drying for 10 to 30 minutes.

5. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 3, characterized in that: The step S2 further comprises: performing a heating treatment at 90 degrees Celsius for 3-6 hours in a deionized water heating treatment box using deionized water that has submerged the treated fin heat exchanger and drying for 30-60 minutes.

6. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 1, characterized in that: The step S3 specifically includes placing the treated fin heat exchanger and the hydrophobic coating preparation solution into a chemical deposition treatment box.

7. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 6, characterized in that: The chemical deposition treatment box is placed in an oven to perform chemical vapor deposition treatment at 85 degrees Celsius for 12-24 hours and then dried for 30-60 minutes.

8. A method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 6 or 7, characterized in that: The hydrophobic coating preparation solution includes: 5% concentration of trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane toluene solution / 2% concentration of n-hexadecyl trimethoxysilane ethanol solution / 2% concentration of 1H, 1H, 2H, 2H-perfluorodecyl triethoxysilane ethanol solution / tridecafluoro-1, 1, 2, 2-tetrahydrooctyl-1-trichlorosilane pure solution.

9. The method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 8, characterized in that: The step S4 of setting the hydrophilic and hydrophobic spacing layer specifically includes removing part of the hydrophobic layer of the processed fin heat exchanger with a laser cleaning machine, so that the hydrophilic and hydrophobic layers on the surface of the fin heat exchanger are evenly spaced and distributed laterally or vertically.

10. A method for processing an air source heat pump high-efficiency defrosting fin heat exchanger according to claim 1 or 9, characterized in that: The step S4 of super lubrication treatment specifically includes immersing the fin heat exchanger in the super lubrication preparation solution and placing it in a vacuum box at 70 degrees Celsius and 100 Pa for 3-6 hours.

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