Graphene nano-coating PTC electric heater and manufacturing method thereof

Abstract

The invention belongs to the technology of electric heaters and relates to a graphene nano-coating PTC electric heater and a manufacturing method thereof. The method comprises the steps of firstly connecting and fixing a well-assembled heating element with a radiator; then mixing graphere nano-powder with liquid resin uniformly to form a mixed solution; and then coating the mixed solution on the surface of radiating bars and curing. As the graphere nano-coating is coated on the radiating surface, the graphene nano-coating PTC electric heater has excellent heating performance, excellent reprocessing performance, excellent high-temperature resistance and excellent corrosion resistance; and the coating processing technology is simple and the technological environment is relatively good. In addition, the coating surface is smooth, so that moisture is not easy to attach to the surface of the coating. Compared with PTC electric heaters with other types of coatings, the graphere nano-coatingbased PTC electric heater has better heat exchange performance, simpler manufacturing technology, higher corrosion resistance and lower manufacturing cost.

Description

technical field [0001] The invention belongs to the electric heater technology, and relates to a graphene nano-coated PTC electric heater and a manufacturing method thereof. Background technique [0002] PTC electric heater has the advantages of high electrothermal conversion efficiency, automatic constant temperature and long natural life. It is widely used in room heating, bathroom heating, air conditioning heating, drying room heating, clothes dryer, hand dryer and electric control cabinet heating. and other occasions. Corrugated-fin PTC electric heaters are generally used in the above-mentioned occasions, which are mainly composed of PTC ceramic heating cores, aluminum heat-conducting tubes, and aluminum heat-dissipating strips. In a high-humidity environment, the aluminum cooling strip of the corrugated-fin PTC electric heater is easy to absorb and accumulate water vapor. With the passage of time, the surface of the heat pipe and cooling strip will accelerate oxidation...

AI Technical Summary

Problems solved by technology

In a high-humidity environment, the aluminum cooling strip of the corrugated-fin PTC electric heater is easy to absorb and accumulate water vapor. With the passage of time, the surface of the heat pipe and cooling strip will accelerate oxidation and corrosion due to the existence of water vapor. On the one hand, it will cause The looseness of the heat dissipation strips, on the other hand, will form metal oxide powder, which will seriously affect the service life and performance of the PTC electric heater

[0003] Chinese patent (application number 201410593520.8, patent name "An anti-condensation and corrosion-resistant PTC electric heater and its manufacturing method") discloses an electric heater based on spraying ceramic coating and its manufacturing method. The ceramic on the surface of the cooling strip Although the coating can prevent water vapor from coming into contact with metal materials and cause corrosion, the thermal conductivity of the ceramic coating is poor, which affects the heat transfer performance of the electric heater, and its manufacturing process requires surface sandblasting, surface preheating, and more Layer spraying and long-time curing processes, the manufacturing method is complex

[0004] Chinese patent (application number 201420555906.5, patent name "A PTC electric heater element for preventing oxidation dust") discloses a process of electroplating or anodizing the surface of aluminum tubes, cooling strips or aluminum strips. 1. An electroplating layer or an oxide layer is formed on the surface of the aluminum strip of the cooling strip to achieve the purpose of preventing oxidation dust of the PTC electric heater, but the electroplating or anodizing process consumes a lot of energy, and the environmental protection problems caused by the electroplating or anodizing process itself cannot be ignored

In addition, there are methods of spraying or plating Teflon on the cooling strips, but the cost of raw materials is very high. If the environmental pollution control caused by the process is considered at the same time, the industrial use will increase a lot of costs and be limited.