For the semi-open impeller basic stage, due to the gap leakage between the impeller cover disc and the stator, the leakage has an important negative impact on efficiency. In this design, the efficiency of the original basic level is not improved. Impeller strength Due to the large single-stage pressure ratio of the compressor, the peripheral speed of the impeller outlet is high, and the impeller strength has been greatly tested. Therefore, the impeller material was selected from high-strength alloy structural steel materials, and re-consideration was made in the structure of the impeller shaft. The impeller stress calculation uses the stress analysis software cooperating with Xi'an Jiaotong University, which fully complies with the calculation of the axial force of the gear. The series formula has taken into account the combination of static pressure and aerodynamic axial thrust. The end result is axial thrust. This is the rotor with the largest single-stage axial thrust in this model. The compressor still uses the thrust plate on the pinion shaft to transmit the axial thrust generated by the rotor to the large gear shaft, and finally bears the thrust bearing of the large gear shaft. After the balance of the axial force of the gear, the axial force remains first. The strength of the thrust disk must be sufficient, and at the same time, the linear speed difference between the thrust disk on the pinion and the thrust surface of the large gear should be ensured. The thrust bearing adopts the Mitchell type according to the characteristics of large axial force, which improves the bearing capacity of the thrust bearing. Due to structural constraints, the Mitchell bearing does not use the original Mitchell bearing and thrust bearing structure of our factory, but the support part is in the middle and the thrust pad is on the two sides, making the whole thrust bearing compact. The adjustment method adopts the method of importing the regulating blade to adjust the performance of the compressor, so as to meet the user's use requirements within a certain range. The electric actuator is used to drive the inlet adjustment vanes, and the adjustment vanes are manufactured by precision casting. When the product was tested at the manufacturing plant, the Shenyang area was in winter, comparing the design value with the experimental value performance curve. Through the comparison of the data and the graph, the measured performance curve is in agreement with the expected curve in the flow range, and the efficiency is basically in accordance with the design value, but the measured curve is steep.
The multifunctional hammer mill is widely used in crushing various biomass wood waste and straw material. The motor and the hammers are directly connected by the coupling. There is no dead angle during the crushing so the finished product is very fine. The corners of the hammers are welded with high hardness material like carbon tungsten alloy. The welding layer thickness is around 3mm. The lifetime is 7- 8 times by normal 65Mn overall quenching hammer. The rotor has made the balance test and can work backward. It`s the best choice to prepare milled material for pellet machine.
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