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Optimization of the pre-outlet and main-outlet bores in scroll compressors.

Number: 1388

Author(s) : BAUMGART R., AURICH J.

Summary

The A/C system of electric vehicles are usually equipped with an electric driven scroll compressor. This compressor type offers some advantages like a good volumetric efficiency and a small installation space.
In today‘s automotive scroll compressors, the fixed scroll wrap mostly contains two pre-outlet bores which are located on certain positions in the compression chambers. These bores can avoid the internal over-compression, improving the compressor properties particularly at low load and partial load operating points.
Beside these two small pre-outlet bores, a scroll compressor has only one main outlet bore - contrary to an automotive axial piston compressor with one outlet bore for each cylinder. The majority of the refrigerant is discharged through this single main outlet bore. This causes significant pressure losses and a high driving power especially at high load operating points. Furthermore, this bore is partially covered by the orbiting scroll at particular driving angles which increases the pressure losses and the driving power even more.
In order to decrease the required driving power not only at low load operating points, but also at high load operating conditions, Baumgart et al. (2018) investigated different positions for the pre-outlet bores and the main outlet bore. It could be proven that an appropriate positioning of the outlet bores decreases the maximum pressure in the chambers and consequently reduces the required driving power significantly in all operating points. However, only circular bores for the main- and pre-outlets were considered for this research.
Now this contribution investigates non-circular bores for the main and the pre-outlets of an exemplary CO2-scroll compressor in order to achieve a further reduction of the required driving power. The first part introduces the geome-trical and physical based simulation model as well as the applied parameters. Afterwards, the simulation results are discussed and the achievable power savings are presented.

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Pages: 10 p.

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  • Original title: Optimization of the pre-outlet and main-outlet bores in scroll compressors.
  • Record ID : 30030314
  • Languages: English
  • Subject: Technology
  • Source: 2022 Purdue Conferences. 26th International Compressor Engineering Conference at Purdue.
  • Publication date: 2022/07/15
  • Document available for consultation in the library of the IIR headquarters only.

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