Integral milling closed impeller of expander

Impeller is the core component of compressor. The leading compressor manufacturers in the world all implement technical blockade on the key manufacturing process of closed three-dimensional impeller. Three dimensional closed impeller is widely used in large compressors. Because of its large degree of distortion, narrow channel and large curvature of the rotating surface of the shaft disc and cover disc, it is difficult to solve the problem by using general processing technology. Previously, only a few countries in the world mastered the technology, while China's closed impeller integral milling technology is still a blank. On the basis of the original five axis machining process of impeller, the unit developed the special process software for Impeller Based on five axis machining center, and studied the corresponding cutter types and processing parameters of each process, solved the technical difficulties of integral milling processing of high-strength three-dimensional closed impeller, improved the manufacturing accuracy of impeller, and accelerated the development progress of products, It meets the needs of new product development of large compressor.

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Faq of Integral milling closed impeller of expander

The factors affecting the efficiency of expander

Generally, the actual cooling capacity of expander is always less than the theoretical cooling capacity. Under the same inlet and outlet pressure and inlet gas temperature, the lower the efficiency of expander, the smaller the unit refrigerant cooling capacity and the smaller the temperature drop efficiency of expander. The efficiency of expander depends on the size of various losses inside the expander. Due to the existence of various losses, the ability of gas to do external work is reduced in varying degrees. To sum up, the losses mainly include the following aspects: 1. When the air flow passes through the work wheel and the deflector, the loss caused by friction and air flow impact on the runner surface is called flow loss. 2. When the impeller is rotating, the friction heat generated by the gas around the wheel disc will increase the temperature of the gas, which is called friction blast loss. 3. When the gas passes through the deflector, the leakage from the gap bet

Nov 07, 2025

Throttling refrigeration and expander refrigeration

When the same pressure is reduced, the temperature drop of throttling is far greater than that of expansion. This is because the gas does not work externally during throttling, but when the molecular spacing increases, the potential energy of molecules increases, and the kinetic energy decreases correspondingly, reflecting the decrease of temperature. The expansion refrigeration not only increases the potential energy between molecules, but also makes external work to push the impeller to rotate or push the piston to move. All these energies need to reduce the kinetic energy of molecules, so the molecular kinetic energy decreases more and the temperature drop is larger.

Mar 06, 2025