What is Graphite Rotor
A graphite rotor is a part of the aluminum alloy smelting equipment. During the aluminum alloy smelting process, hydrogen and oxidation residues will be produced, which must be purified and removed by a refining degasser. One of the indispensable accessories of the slag machine. The graphite rotor consists of a rotor rod and a nozzle.The rotors are made from zx-grade graphite, which has twice the oxidation resistance of standard graphite. The rotors improve cast aluminium quality through efficient kinetic mixing and decreased hydrogen and impurity levels.
Advantages of Graphite Rotor
Graphite rotor products have good adsorption
The pore structure of carbon gives carbon good adsorption, so carbon is often used as an adsorption material to adsorb moisture, odor and toxic substances. Someone has done an experiment, the graphite rotor baking tray for barbecue looks very clean, but when heated on the induction cooker, you will see that the grease and harmful substances adsorbed during grilling will slowly seep out.
Graphite rotor products have good thermal conductivity
The baking tray and pot made of graphite rotor are heated quickly, and the baked food is heated evenly, cooked from the inside out, and the heating time is short, which not only has a pure taste, but also locks in the original nutrients of the food. We've experimented. When we use a graphite baking tray to grill meat, the induction cooker can only preheat for 20-30 seconds when it starts to hit a high fire, and can only start baking food on a low heat, which is both useful and energy-saving.
Graphite rotor products have chemical stability and erosion resistance
The graphite rotor has good chemical stability at room temperature and is not attacked by any strong acid, strong base or organic solvent. Therefore, even if the graphite products are used for a long time, the loss is very small, and it is the same as new if it is wiped clean.
Graphite rotor products have strong antioxidant and reducing effects
Especially the graphite rotor mattress, after heating, will produce negative oxygen ions, activate the surrounding items, maintain human health, effectively prevent aging, and make the skin full of luster and elasticity.
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Our factory
Henan daking import and export co., ltd. Is one of china's professional production, research and development, sales of graphite mold manufacturers. The company is committed to providing customers with high quality graphite raw materials and precision graphite products processing.
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Graphite mold, graphite crucible, graphite sagger, graphite plate, graphite block, graphite rod, graphite tube, graphite box, graphite electrode, diamond sintering mold, heat treatment vacuum furnace graphite accessories, photovoltaic semiconductor industry graphite parts, graphite heater for monocrystalline silicon, various special-shaped graphite accessories, etc.
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Our company with high quality production process, good production environment and advanced equipment, as well as high quality products, to win the praise of customers at home and abroad,products are exported to overseas: The united states, south korea, japan, turkey, russia, pakistan and other countries and regions.
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We have a perfect after-sales team to track products and provide after-sales service. We believe that customers' feedback and suggestions can make henan daking grow continuously.
In the aluminum smelting body with around 750℃ high temperature, graphite rotor is continuously working in the condition of rotate speed 200r/min-400r/min. Normally, the requirement of working life reaches over one month. The graphite rotor of RAY GROUP LIMITED CO., LTD.adopts high purity graphite to manufacture. The quality of graphite has an obvious influence on the working life of rotor. At the same time, it is done with antioxidant protection coating on the surface. Its working life could be extended to 50-60 days.
Working principle: Graphite rotor is composed of rotor rod and sprayer. Driving system drives graphite rotor to rotation motion. Argon or nitrogen is blown into aluminum smelting body through rotor rod and sprayer. High speed rotating graphite rotor breaks up argon or nitrogen which enters into aluminum smelting body to form many small bubbles and disperse them into the molten metal. At the same time, rotating rotor prompts argon and inclusions of aluminum smelting body to spread, which produces to contact with bubbles. In the smelting body, bubbles absorbs argon and antioxidant slag inclusion depending on gas partial pressure difference and surface adsorption principle and rises up with bubbles and is brought out smelting body surface, which makes smelting body purified.
The purification process of state aluminum alloy is the main means to improve the comprehensive performance of aluminum alloy. In the purification process, the purification gas and solvent are mixed, and the graphite rotor is blown into the aluminum melt for purification treatment, which is the current treatment method.
1. The degassing rate is above 50%, which shortens the smelting time and reduces the production cost.
2. It is suitable for purification of molten aluminum in crucible furnaces, ladles, and incubators.
3. The surface has been treated with anti-oxidation, and the service life is about 5 times that of ordinary products. Widely used in aluminum alloy casting industry.
4. In the aluminum processing industry such as aluminum plate, aluminum foil casting, aluminum alloy wheel hub, etc., the service life is as long as 2 months.
5. The rotary refining degasser can be divided into mobile type and fixed type, which are suitable for different working environments.
Graphite rotary nozzles are made of high-purity graphite. The structure of the nozzle not only considers the need to disperse the bubbles, but also uses the centrifugal force generated by stirring the aluminum alloy melt to make the melt enter the nozzle and mix with the horizontally ejected gas to form a gas/liquid jet, which increases the contact area and contact time between the bubbles and the aluminum alloy liquid, and improves the degassing and purification effect.
The speed of the graphite rotor can be controlled by a frequency converter to achieve stepless adjustment, and its height can be reached. The specifications of the graphite rotor and impeller are as follows: The high-purity oxidation-resistant graphite rotor has the characteristics of high strength, high temperature resistance, and aluminum flow corrosion resistance. During the purification and degassing process, nitrogen gas is introduced into the surface of the aluminum alloy liquid in the tank for protection, so that the part of the graphite rotor exposed from the aluminum alloy liquid is in an inert gas, preventing the rotor from being oxidized at high temperature and prolonging the service life of the rotor.
Operating Skills for Using Graphite Rotor
Preheating before using: Before dipping into the aluminum liquid, graphite rotor is warmed up for 5-10 minutes above 100mm over liquid surface to avoid the effect of quenching to material. It must be passed through air before rotor dipping into liquid and stop air supply after putting forward liquid surface to avoid air hole block of rotor sprayer.
Air isolation: In the purified chamber, it passes through nitrogen or argon and ensure it is positive pressure in the chamber, isolate outer air to avoid graphite rotor antioxidant.
The depth of rotor dipping: Graphite rotor dip into aluminum smelting body with a reasonable depth to strengthen set revealing about 80mm of aluminum liquid surface, dip under about 60mm of liquid surface. In this case, it can effectively increase antioxidant waste of rotor and time of washing friction.
Stable driving system: Graphite rotor and driving system is connected by connecting rod (tube). The connecting rod will occur deformation under high temperature in the long time or related parts of driving equipment will cause loose, which both effect the rotor stability to neutral and working and easy to break off or bump against graphite rod to cause damage.
Nitrogen or argon must purify: If the nitrogen or argon of aluminum smelting body is not purified which caused by the air leakage of pipes and joints, it will cause seriously antioxidant of rotor, even the spray holes. This will greatly shorten the working life of rotor.
Application of Graphite Rotor
Automotive applications
In the automotive industry, graphite rotors are widely recognized for their exceptional heat dissipation capabilities, which contribute to improved braking performance, reduced wear and tear, and overall enhanced safety. Furthermore, their lightweight properties allow for reduced energy consumption, thereby enabling greater fuel efficiency and sustainability in vehicles.
Aerospace applications
In the aerospace domain, where weight reduction is crucial, graphite rotors have emerged as a game-changer. Their lightweight construction not only contributes to fuel efficiency but also enables enhanced maneuverability. Moreover, the high thermal conductivity of graphite rotors ensures efficient heat dissipation, making them an excellent choice for critical components in aircraft engines and braking systems.
Power generation and industrial applicatios
Graphite rotors have revolutionized power generation and industrial sectors by offering efficient and cost-effective solutions. Their ability to withstand high temperatures and resist corrosion makes them ideal for use in turbines, compressors, and various heavy machinery applications. Furthermore, their longevity and low maintenance requirements offer substantial cost savings for businesses.
Future prospects and advancements
As technology continues to advance, researchers and manufacturers are exploring new ways to enhance the properties of graphite rotors further. Advancements in manufacturing techniques, such as 3d printing, are expanding the possibilities, enabling the creation of complex rotor designs with improved efficiency and performance.
Maintenance of Graphite Rotor
The graphite rotor is composed of a rotor rod and a nozzle. The transmission system drives the graphite rotor for selective movement. Argon or nitrogen is blown into the aluminum melt through the rotor rod and nozzle. The high-speed rotating graphite rotor disperses the argon in the aluminum melt to form many small bubbles, which are dispersed in the molten metal, and contact with the bubbles to produce the principle of adsorption so that the solution can be purified. So, how do we maintain the graphite rotor?
The graphite nozzle of the graphite rotor is made of high-purity graphite. In addition to considering that the bubbles should be dispersed, the nozzle structure also uses the centrifugal force generated by the aluminum alloy solution to increase the contact area and contact time between the bubbles and the aluminum alloy liquid, thereby improving purification effectiveness, and the life of the general use of the rotor is generally more than one month, and the life of the anti-oxidation protective coating on the surface can be extended to 50-60 days.
When the graphite rotor is immersed in the liquid aluminum, we have to preheat about 100mm above the liquid level for 5 to 10 minutes to avoid the influence of the cold collection on the material. In addition, before the graphite rotor is immersed in the liquid, we must first pass the gas. The air supply can be stopped after the rotor has raised the liquid level, so as to prevent the air holes of the graphite rotor nozzle from being blocked.
Characteristics of Graphite Rotor Vanes
Graphite rotor vanes are widely used due to their several inherent qualities. It’s not surprising that they are the material of choice for many industrial vacuum pumps. Their key characteristics include:
High-temperature resistance
Graphite has a high melting point of 3650°c, making graphite rotor vanes resistant to temperatures far exceeding the operational limits of vacuum pumps.[1] therefore, even if it works for a long time in a high-temperature environment, there will be no structural or performance changes.
01
Corrosion resistance
Graphite rotor vanes are highly corrosion-resistant and non-reactive to most acids, gases, and other corrosive chemicals that are commonly present in pumps’ working processes. It ensures the service life and reliability of rotor blades in various industrial environments.
2
High mechanical strength
Graphite performs well in terms of resistance to bending and wear, allowing graphite vacuum pump vanes to withstand high-speed rotation for extended periods without being easily deformed or damaged.
03
Good chemical stability
Graphite rotor vanes have good chemical stability and are not easily reactive with other chemicals. It enables rotor blades to operate stably in various environments while maintaining their structural and functional integrity.
04
Excellent self-lubrication
Graphite materials have a good coefficient of friction, which can reduce friction with the pump housing, reducing wear and heat generation. This allows the graphite rotor vanes to rotate more smoothly, reducing the occurrence of faults.
05
How to Carry Out Anti-Oxidation Treatment on Graphite Rotors
Rotor immersion depth: Immerse the graphite rotor into the aluminum melt to a reasonable depth, so that the reinforcing sleeve is exposed about 80mm above the aluminum liquid level and about 60mm below the liquid level, which can effectively increase the time the rotor resists oxidation loss and erosion wear. .
Gas blocking: Pour nitrogen or argon into the purification room to ensure positive indoor pressure to block outside air and avoid oxidation of the graphite rotor.
Harmless argon or nitrogen: If leaks in pipes and joints lead to the introduction of impure argon or nitrogen into the aluminum melt, the upper part of the rotor will be severely oxidized, and even several rotor nozzles in the lower part will be oxidized. , greatly shortening the service life of the rotor.
Preheat before use: Before the graphite rotor is immersed in the aluminum liquid, preheat it for 5 to 10 minutes at about 100 mm above the liquid level to avoid the impact of quenching on the raw materials; before the rotor is immersed in the liquid, gas must be introduced; only when the rotor lifts the liquid the air supply can be stopped only after reaching the correct position to avoid clogging the air holes of the rotor nozzle.
Stable transmission system: The graphite rotor is connected to the transmission system through a connecting rod (tube). The connecting rod is always deformed under the action of high temperature, or the relevant parts of the transmission equipment are loose, which will affect the centering and operating stability of the rotor, and easily cause the graphite rotor to break or be damaged by collision.
Henan Daking Import and Export Co., Ltd. (Henan Daking for short) is one of China's professional production, research and development, sales of graphite mold manufacturers. The company is committed to providing customers with high quality graphite raw materials and precision graphite products processing. The raw materials used by our company, such as isostatic pressed graphite, molded graphite and EDM graphite, have the characteristics of high strength, good thermal shock resistance, high temperature resistance, corrosion resistance and strong oxidation resistance.
FAQ
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