Graphene aluminum evaporator and condenser and manufacturing method

Abstract

The invention discloses a graphene aluminum evaporator and condenser and a manufacturing method. A rectangular aluminum plate with the same length as the evaporation coil pipe and the width equal to the diameter D * pi of the evaporation coil pipe is cut, a plurality of small holes with the diameter of 0.2 mm are punched in the rectangular aluminum plate through laser, and then the evaporation coil pipe is formed through a rotating shaft. The preparation method comprises the following steps: uniformly mixing graphene powder and water according to a ratio of 1: 5 with a small amount of organic glue under the stirring of a stirrer to form a graphene suspension, and mounting an evaporation fin on an evaporation coil; the evaporation coil pipe provided with the evaporation fins is put into the graphene turbid liquid stirred by the stirrer to be soaked; the evaporation coil and the evaporation fins covered with the graphene turbid liquid on the surfaces are put into a drying furnace, so that most of water is evaporated, only a small part of water is reserved, and graphene adheres to the evaporation coil and the evaporation fins. And putting the evaporation coil and the evaporation fins which lose part of water into a heating furnace, closing a door, introducing 2 MPar of nitrogen, increasing the temperature in the heating furnace to 400 DEG C, and curing.

Description

Technical fields:

[0001] This invention relates to a graphene aluminum evaporator and condenser, and a method for manufacturing them. Background technology:

[0002] Most air conditioner evaporators are made of copper, but the current price of copper exceeds 10,000 RMB per ton, while aluminum only costs 20,000 RMB per ton. Aluminum has a higher specific heat value than copper, meaning its heat transfer efficiency is lower. Furthermore, aluminum is easily corroded, especially in outdoor-mounted condensers. Replacing copper with aluminum reduces the lifespan of an air conditioner from 15 years to 8 years, but the price of an aluminum-based air conditioner is half that of a similarly powerful unit. Aluminum condensers, installed outdoors, are easily corroded and leak refrigerant due to exposure to wind, sun, and rain. Finally, the heat transfer efficiency of aluminum evaporators and condensers is only 60% that of copper. Summary of the Invention:

[0003] Graphene-aluminum evaporators and condensers. The outer surface of the aluminum evaporator has a thin graphene film, and the aluminum evaporator coils contain numerous 0.2 mm diameter pores filled with graphene. The aluminum evaporator fins also have a thin graphene film on their surface. The graphene-aluminum condenser structure is as follows: The outer surface of the aluminum condenser has a thin graphene film, the aluminum condenser coils contain numerous 0.2 mm diameter pores filled with graphene, and the aluminum condenser fins have a thin graphene film on their surface.

[0004] Methods for manufacturing graphene-aluminum evaporators and condensers. Method for manufacturing the graphene-aluminum evaporator: Cut a rectangular aluminum plate with the same length as the evaporator coil and a width equal to the diameter D·π of the evaporator coil. Use a laser to drill many small holes (0.2 mm in diameter) into the rectangular aluminum plate. Roll the rectangular aluminum plate into a round tube and weld the seams to form the evaporator aluminum tube. Thread the ends of the evaporator aluminum tube. Mix graphene powder and water in a 1:3 ratio, adding a small amount of organic glue, and stir evenly in a mixer to form a graphene suspension. Seal the lower end of the evaporator aluminum tube with nuts. Put sand into the evaporator aluminum tube and seal the upper end with nuts. Then, use a flat round tube to wind the sand-filled evaporator aluminum tube to form an evaporator coil. Unscrew the nuts at both ends of the evaporator coil, pour out the sand from the evaporator coil, and then blow the sand out of the evaporator coil using compressed air. The sand inside the evaporator coil is rinsed with pressurized water using a water pump, then the water is blown out of the evaporator coil using compressed air, and finally the evaporator coil is dried. The evaporator fins are then installed on the evaporator coil. One end of the evaporator coil is sealed with a nut, and the other end is connected to the blower's duct. The evaporator coil with fins is then immersed in a graphene suspension stirred in a mixer. Because the pressure inside the evaporator coil is greater than the pressure outside, the graphene suspension will not enter the evaporator coil. The evaporator coil soaked in the graphene suspension is then removed, and the duct and nut are disconnected. Due to surface tension, the graphene suspension seals the 0.2 mm pores on the evaporator coil. The evaporator coil and fins, covered with the graphene suspension, are then placed in a drying oven to evaporate most of the moisture, leaving only a small amount to allow the graphene to adhere to the evaporator coil and fins. The partially dehydrated evaporator coils and evaporator fins are placed in a heating furnace. After closing the furnace, nitrogen gas at 2 MPa is introduced, raising the furnace temperature to 220°C. Under the 2 MPa nitrogen pressure, the graphene is pressed onto the surface of the evaporator coils and fins, resulting in the first curing. The evaporator coils with graphene-coated fins are removed from the heating furnace, and both ends are sealed with nuts. They are then immersed in a graphene suspension stirred in a mixer. The immersed evaporator coils are removed, and the nuts at both ends are removed. The evaporator coils and fins, now covered in graphene suspension, are placed in a drying oven to evaporate most of the moisture, leaving only a small amount to allow the graphene to adhere to the evaporator coils and fins. The partially dehydrated evaporator coils and evaporator fins are placed in a heating furnace. After the door is closed, 2 MPa of nitrogen gas is introduced to raise the temperature inside the heating furnace to 220°C. Under the pressure of 2 MPa nitrogen gas, the graphene is pressed onto the surface of the evaporator coils and evaporator fins and solidifies for the first time. The furnace temperature is then further raised to 400°C to solidify the graphene a second time. Finally, the graphene aluminum evaporator is removed from the heating furnace.The manufacturing method of a graphene-aluminum condenser: Cut a rectangular aluminum plate with the same length as the condenser coil and a width equal to the diameter D·π of the condenser coil. Use a laser to drill many small holes with a diameter of 0.2 mm on the rectangular aluminum plate. Roll the rectangular aluminum plate into a round tube and weld the seams to form the condenser aluminum tube. Thread the ends of the condenser aluminum tube. Mix graphene powder and water in a 1:3 ratio, adding a small amount of organic glue, and stir evenly in a mixer to form a graphene suspension. Seal the lower end of the condenser aluminum tube with a nut. Put sand into the condenser aluminum tube and seal the upper end with a nut. Then, use a flat round tube to wind the sand-filled condenser aluminum tube to form a condenser coil. Unscrew the nuts at both ends of the condenser coil, pour out the sand from inside the coil, then blow the sand out with compressed air. Rinse the condenser coil with pressurized water using a water pump, then blow out the water with compressed air to dry the coil. Install the condenser fins onto the condenser coil. Seal one end of the condenser coil with the nuts, and connect the other end to the blower duct. Immerse the condenser coil with the fins in a graphene suspension stirred in a mixer. Because the pressure inside the condenser coil is greater than the pressure outside, the graphene suspension will not enter the condenser coil. Then remove the condenser coil that has been immersed in the graphene suspension, and remove the duct and nuts. Due to surface tension, the graphene suspension seals the 0.2 mm pores on the condenser coil. A condenser coil and evaporator fins coated with graphene suspension are placed in a drying oven to evaporate most of the moisture, leaving only a small amount to allow the graphene to adhere to the coils and fins. The partially dehydrated condenser coil and fins are then placed in a heating furnace. With the door closed, 2 MPa of nitrogen gas is introduced, raising the furnace temperature to 220°C. Under the 2 MPa nitrogen pressure, the graphene is pressed against the surface of the condenser coil and fins, resulting in the first curing process. The condenser coil with the graphene-coated fins is then removed from the heating furnace, and both ends are sealed with nuts. It is then immersed in a graphene suspension stirred in a mixer. The immersed condenser coil is then removed, and the nuts at both ends are removed. The condenser coil and fins, still coated with graphene suspension, are placed in a drying oven to evaporate most of the moisture, leaving only a small amount to allow the graphene to adhere to the coils and fins. The partially dehydrated condenser coils and condenser fins are placed in a heating furnace. After the door is closed, nitrogen gas at 2 MPa is introduced to raise the temperature inside the furnace to 220°C. Under the nitrogen pressure of 2 MPa, the graphene is pressed onto the surface of the condenser coils and condenser fins and solidifies for the first time. The furnace temperature is then further raised to 400°C to solidify the graphene a second time. Finally, the graphene aluminum condenser is removed from the heating furnace.

[0005] The graphene aluminum evaporator of an air conditioner is installed indoors. Many bacteria and green mold can grow on the fins of the evaporator, which can only be removed with dilute sulfuric acid. The evaporator fan blows indoor air onto the fins of the evaporator. The graphene film on the surface of the fins transfers heat to the graphene film on the outer surface of the evaporator coil. This heat is then transferred through the evaporator coil and the graphene inside the numerous 0.2 mm diameter pores to the refrigerant inside the evaporator coil, where it vaporizes and absorbs the heat. Graphene has a specific heat value one-tenth that of copper, extremely high thermal conductivity, and solid graphene is as tough as steel, making the air conditioner's graphene aluminum evaporator corrosion-resistant and very robust.

[0006] The graphene aluminum condenser of the air conditioner is installed outdoors. A layer of dust will cover the fins of the graphene aluminum condenser, which can only be cleaned off with dish soap. In the graphene aluminum condenser coil of the air conditioner, the refrigerant liquefies and releases vaporization heat, which is transferred to the condenser coil. The refrigerant then transfers this heat through the graphene in the coil and the numerous 0.2 mm diameter holes to the graphene film on the outer surface of the evaporator coil. This graphene film then transfers the heat to the graphene film on the condenser fins. A cooling fan blows outdoor air onto the condenser fins, carrying away heat from the graphene film and cooling it, further cooling the refrigerant inside the coil. Graphene has a specific heat value that is one-tenth that of copper, and its thermal conductivity is extremely high. Solid graphene is as tough as steel, and graphene aluminum condensers for air conditioners are corrosion-resistant and very robust.

[0007] Pour some water into an inkstone, then grind an ink block on the inkstone to obtain ink. Use a brush dipped in this ink to write on paper. The ink block is made by evenly mixing graphite powder, water, and gelatin in a specific ratio, shaping it into a long strip, and then drying it. Gelatin is made by boiling pigskin, filtering it through gauze, and obtaining a jelly-like substance. With gelatin, graphite can adhere to paper to form characters, but gelatin cannot vaporize. The organic adhesive used in this powder has a certain viscosity, enabling it to adhere graphene to the inner and outer surfaces of aluminum evaporator and condenser coils, as well as the surfaces of aluminum evaporator and condenser fins.

Claims

1. A graphene-aluminum evaporator and condenser, characterized in that: The graphene aluminum evaporator has the following structure: a graphene film is present on the outer surface of the aluminum evaporator; graphene is contained in many small holes with a diameter of 0.2 mm on the aluminum evaporator coil; and a graphene film is present on the surface of the aluminum evaporator fins. The graphene aluminum condenser has the following structure: a graphene film is present on the outer surface of the aluminum condenser; graphene is contained in many small holes with a diameter of 0.2 mm on the aluminum condenser coil; and a graphene film is present on the surface of the aluminum condenser fins.

2. The method for manufacturing the graphene-aluminum evaporator and condenser according to claim 1, characterized in that: The manufacturing method of a graphene-aluminum evaporator: Cut a rectangular aluminum plate with the same length as the evaporator coil and a width equal to the diameter D·π of the evaporator coil. Use a laser to drill many small holes (0.2 mm in diameter) into the rectangular aluminum plate. Roll the rectangular aluminum plate into a round tube and weld the seams to form the evaporator aluminum tube. Thread the ends of the evaporator aluminum tube. Mix graphene powder and water in a 1:3 ratio, adding a small amount of organic glue, and stir evenly in a mixer to form a graphene suspension. Seal the lower end of the evaporator aluminum tube with nuts. Put sand into the evaporator aluminum tube and seal the upper end with nuts. Then, use a flat round tube to wind the sand-filled evaporator aluminum tube to form an evaporator coil. Unscrew the nuts at both ends of the evaporator coil and clean the inside of the evaporator coil. Pour out the sand, then blow the sand out of the evaporator coil with compressed air. Rinse the sand out of the evaporator coil with pressurized water using a water pump, then blow out the water from the evaporator coil with compressed air, and finally dry the evaporator coil. Install the evaporator fins on the evaporator coil. Seal one end of the evaporator coil with a nut cap, and connect the other end of the evaporator coil to the blower pipe. Then immerse the evaporator coil with evaporator fins in the graphene suspension stirred by the mixer. Because the pressure inside the evaporator coil is greater than the pressure outside the evaporator coil, the graphene suspension will not enter the evaporator coil. Take out the evaporator coil that has been immersed in the graphene suspension, remove the air duct and the inner nut. Due to the surface tension, the graphene suspension will cause the 0.A 2 mm orifice is sealed; an evaporator coil and evaporator fins coated with graphene suspension are placed in a drying oven to evaporate most of the moisture, leaving only a small amount so that the graphene adheres to the evaporator coil and fins; the partially dehydrated evaporator coil and fins are then placed in a heating furnace, the door is closed, and 2 MPa of nitrogen gas is introduced to raise the temperature inside the furnace to 220°C. Under the 2 MPa nitrogen pressure, the graphene is pressed against the surface of the evaporator coil and fins, resulting in the first curing; then the evaporator coil with graphene-coated fins is removed from the heating furnace, and both ends of the evaporator coil are sealed with nuts. It is then immersed in a graphene suspension stirred in a mixer. Remove the evaporator coil containing the turbid liquid, remove the nuts at both ends of the evaporator coil, and place the evaporator coil and evaporator fins, covered with graphene suspension, into a drying oven to evaporate most of the moisture, leaving only a small amount so that the graphene adheres to the evaporator coil and evaporator fins. Place the partially dehydrated evaporator coil and evaporator fins into a heating furnace, close the door, and introduce 2 MPa of nitrogen gas to raise the temperature inside the furnace to 220°C. Under the pressure of 2 MPa nitrogen gas, the graphene is pressed against the surface of the evaporator coil and evaporator fins, resulting in the first curing. Further raise the furnace temperature to 400°C for the second curing of the graphene. Then, remove the graphene aluminum evaporator from the heating furnace. The method for manufacturing a graphene aluminum condenser: Cut a piece... A rectangular aluminum plate, the same length as the condenser coil and with a width equal to the condenser coil diameter D·π, is laser-drilled with numerous 0.2 mm diameter holes. The plate is then rolled into a round tube, and the seams are welded to form a condenser aluminum tube. Threads are then machined onto both ends of the condenser aluminum tube. Graphene powder and water are mixed in a 1:3 ratio, with a small amount of organic glue added, and stirred evenly in a mixer to form a graphene suspension. The lower end of the condenser aluminum tube is sealed with a nut. Sand is placed into the condenser aluminum tube, and the upper end is sealed with a nut. A flat round tube is then wound around the sand-filled condenser aluminum tube to form a condenser coil. The nuts at both ends of the sealed condenser coil are unscrewed, and the sand inside is poured out. Next, the sand inside the condenser coil is blown out with compressed air, and the sand inside the condenser coil is rinsed with pressurized water using a water pump. Then, the water inside the condenser coil is blown out with compressed air to dry the condenser coil. The condenser fins are then installed on the condenser coil. One end of the condenser coil is sealed with a nut, and the other end of the condenser coil is connected to the blower duct. Then, the condenser coil with condenser fins is immersed in a graphene suspension stirred in a mixer. Because the pressure inside the condenser coil is greater than the pressure outside the condenser coil, the graphene suspension will not enter the condenser coil. Then, the condenser coil that has been immersed in the graphene suspension is removed, and the duct and nut are removed. Due to surface tension, the graphene suspension removes the 0.A 2mm aperture is sealed. A condenser coil and evaporator fins, their surfaces coated with a graphene suspension, are placed in a drying oven to evaporate most of the moisture, leaving only a small amount to allow the graphene to adhere to the coil and fins. The partially dehydrated condenser coil and fins are then placed in a heating furnace. The furnace is closed, and nitrogen gas at 2 MPa is introduced to raise the temperature to 220°C. Under the 2 MPa nitrogen pressure, the graphene is pressed against the surface of the condenser coil and fins, resulting in the first curing process. The condenser coil, now coated with graphene and containing the fins, is then removed from the furnace. Both ends of the condenser coil are sealed with nuts and then immersed in a graphene suspension stirred in a mixer. Remove the condenser coil soaked in graphene suspension, remove the nuts at both ends of the condenser coil, and place the condenser coil and condenser fins, covered with graphene suspension, into a drying oven to evaporate most of the moisture, leaving only a small amount so that the graphene adheres to the condenser coil and condenser fins. Place the partially dehydrated condenser coil and condenser fins into a heating furnace, close the door, and introduce 2 MPa of nitrogen gas to raise the furnace temperature to 220°C. Under the 2 MPa nitrogen pressure, the graphene is pressed against the surface of the condenser coil and condenser fins, resulting in the first curing. Further raise the furnace temperature to 400°C for a second curing of the graphene. Finally, remove the graphene-aluminum condenser from the heating furnace.