Doubts about the smoke extractor rotor
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There are a few things I don’t understand. The manual for this smoke extractor states that the rotor assembly consists of a disc, a main shaft, moving blades, as well as tie bolts, nuts, sleeves, etc. I’ve searched everywhere for this sleeve component but couldn’t find it. I don’t have a detailed diagram of the rotor either. If any of you members have such a diagram, please send it to me. What is the purpose of the small screw at the center of the tie bolt? The tie rod nut seems very small; how is the preload on the tie rod bolt achieved? Hydraulic, or something else? After all, the torque transmitted is very high
I’ll help you contact an expert to come and take a look; P @lupg
The tie bolt should be tightened by heating, and it is hollow in the center to allow a heating element to pass through.
The center is empty to accommodate electric heating rods, such as for tightening the bolts on the turbine cover.
1 This method uses 8 through-hole small tie bolts to connect the wheel disc to the shaft. 2 By using through-hole bolts, it becomes possible to utilize hollow tie bolts, with the hollow portion of these bolts being used to house heat dissipation rods. 3 The preload on the bolts is determined based on the elastic modulus and coefficient of thermal expansion of the bolt material; after determining the amount of elongation required after heating the bolts, the nuts are tightened, and once cooled, the desired tension between the wheel disc and the shaft is achieved. 4 The small screw at the center of the tie bolt is used to seal the hollow bolt, preventing high-pressure fluid from reaching the low-pressure area. 5 To ensure that the frictional force provided by the bolt is sufficient to transmit torque in emergency situations, a torque-transmitting sleeve is added; it is located at the junction of the disc and the shaft, surrounding the bolt from the outside. (The area in the cross-section where the bolt passes through the connection surface between components 1 and 2)