Casting device and casting method of multistage turbine rotor for micro turbine compressor

Abstract

The invention relates to a casting device and casting method of a multistage turbine rotor for a micro turbine compressor. The device comprises a shell assembly capable of being subject to vacuum pumping, a centrifugal control assembly and a digital casting control assembly, wherein the centrifugal control assembly and the digital casting control assembly are arranged in the shell assembly. A casting mold is arranged on the centrifugal control assembly, the digital casting control assembly is located above the casting mold, a heating coil used for carrying out program temperature regulation onthe casting mold is arranged in the casting mold, and molten alloy in the casting mold is in the gradient slow cooling. The molten alloy is in the gradient slow cooling, an in-order compact uniform metal lattice form is formed in the multistage turbine rotor casting, firmness and toughness of the casting are improved, the problems that in the casting process of an existing multistage turbine rotor for the micro turbine compressor, product quality, particularly the structural strength is not stable, and the rotor blade defective rate is high are solved, and the aims that due to successful casting, the precise-size good-physical-property multistage turbine rotor for the micro turbine compressor is obtained is achieved.

Description

technical field [0001] The invention relates to a multistage turbine rotor for a compressor, in particular to a casting device and a casting method for a multistage turbine rotor for a micro turbine compressor. Background technique [0002] Due to its large intake flow, high speed, stable operation, and simple and compact structure, turbo compressors are widely used in instrument automation, chemical engineering, aerospace and other fields. Relying on the interaction force between the rotating impeller and the airflow to increase the gas pressure, and at the same time accelerate the airflow to obtain kinetic energy, the turbocompressor decelerates the airflow in the diffuser and converts the kinetic energy of the gas into pressure energy to output work. Since the gas flow of the turbocompressor is continuous during the compression process, the gas pressure will gradually increase during the air flow delivery process, so the material strength of the turbine blades is highly r...

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Problems solved by technology

[0007] In view of the above problems, in order to be able to precision cast multi-stage turbine rotors for micro-turbine compressors, on the basis of the integral casting method, a combination of high-speed centrifugal and vacuum casting is adopted, combined with temperature control during the casting process to control the crystallization of alloy materials In order to solve the problem of uneven casting of the internal cavity in the current multi-stage turbine rotor casting process for micro-turbine compressors, air bubbles inside the turbine rotor blades, air resistance, oxidation on the surface, poor mold temperature and crystallization control, etc. The product quality caused by difficulties, especially the unstable strength and high defect rate of rotor blades, etc., the present invention provides a casting device and casting method for multi-stage turbine rotors for micro-turbine compressors

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