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Seal mechanism of tip seal in scroll compressor.

Number: pap. 1255

Author(s) : FUKUTA M., OGI D., MOTOZAWA M., et al.

Summary

Scroll compressors are widely used in room air conditioning cycles, package air conditioning cycles, refrigeration, etc. There are two main leakage paths in a compression chamber formed by a fixed scroll and an orbiting scroll. One is the leakage path through a radial clearance between the wraps of fixed and orbiting scroll. Another leakage path is an axial clearance which is the clearance between a tip of the scroll wrap and a base plate. A tip seal is often used to prevent the leakage through the axial clearance. Although there have been many studies on the tip seal, the seal mechanism of the tip seal is not thoroughly clarified yet. In addition, the relationship between the sealing effect and a frictional loss of the tip seal is also not validated well. In this study, a test apparatus which can evaluate the sealing effect and the frictional force of the tip seal simultaneously is developed. The influence of specification of a tip seal groove on the sealing effect is examined with the test apparatus. When groove angle of the tip seal groove is slightly larger than 90°, since the pressure on outer side of the tip seal becomes low, the tip seal is pressed against the seal groove by the pressure difference between both sides of the tip seal and the leakage is suppressed. As a result, the sealing mechanism of the tip seal is clarified and a design guideline of the tip seal grove is obtained.

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Pages: 10 p.

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Details

  • Original title: Seal mechanism of tip seal in scroll compressor.
  • Record ID : 30012800
  • Languages: English
  • Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
  • Publication date: 2014/07/14

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