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In screw compressors gaps between rotors and casing have to be small, in the range of 30 to 300 μm. These gaps are influenced by thermal expansion when the screw compressor is in operation. The amount of thermal expansion is about the same size as the gaps, even in oil-injected screw compressors. Especially when starting a cold compressor, there ar...
Contexts in source publication
Context 1
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the gate rotors are cooling, the investigation concentrated on ...
Context 2
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the gate rotors are slimmer than those of the main rotor. As thin parts are more prone to fast heating and cooling, the investigation concentrated on ...
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... oil is separated from the on compressed-air demand and shuts repeated many times per hour from losses. Figure 1 shows such a screw compressor only the littleness of the gaps gives the sealing effect. The gap size is about 30 compressors and up to 300µm in big compressors. ...
Context 4
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and cooling, the investigation concentrated on ...
Context 5
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and cooling, the investigation concentrated on these teeth and on the casing ...
Context 6
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and these teeth and on the casing injected screw -speed (about compressor block casing is made of grey (practically the same coefficient of thermal expansion for both) It was chosen because of being typical and manageable for a test: not too big, what had caused costs, not too small, allowing standard temperature probes. ...
Context 7
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and these teeth and on the casing injected screw compressor for industrial air with the type about 4200 r.p.m. compressor block casing is made of grey (practically the same coefficient of thermal expansion for both) It was chosen because of being typical and manageable for a test: not too big, what had caused costs, not too small, allowing standard temperature probes. ...
Context 8
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and these teeth and on the casing compressor for industrial air with the type 4200 r.p.m. for 10 bar ( compressor block casing is made of grey-cast iron; (practically the same coefficient of thermal expansion for both) It was chosen because of being typical and manageable for a test: not too big, what had caused Figure 3 shows the scheme of air ompressed air, cooled and recirculated. ...
Context 9
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and compressor for industrial air with the type bar (g)), and cooled with iron; the rotors are of (practically the same coefficient of thermal expansion for both). ...
Context 10
... order to clarify that, this investigation was made. As we can see in figure 1, the teeth of the slimmer than those of the main rotor. As thin parts are more prone to fast heating and compressor for industrial air with the type nd cooled with the rotors are of It was chosen because of being typical and manageable for a test: not too big, what had caused shows the scheme of air ompressed air, cooled and recirculated. ...
Context 11
... power of a compressor of that size would be some 200 kW. Figure 10 shows the differences in gate-rotor tooth temperatures for that case. The spike at the high- pressure-end rotor-tooth-temperature, when starting, practically disappears, the low-pressure-end rotor-tooth-temperature has a much bigger delay. ...
Context 12
... second answer is: You up of a casing rather eas That gives casing temperature curves. And this extrapolatio so the oil injection temperature curve s Figure 10. Result of extrapolation to triple size This consideration is not exhaustive -there exists not just a thermal expansion of diameters, but also distortion of screws and casing, which may be evaluated with the help of a more complex model. ...
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