Journal of Jilin University(Engineering and Technology Edition) ›› 2020, Vol. 50 ›› Issue (5): 1627-1634.doi: 10.13229/j.cnki.jdxbgxb20190588

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Construction theories of a new type of variable wall thickness scroll profile

Cai-sheng HOU(),Tao LIU(),Li-xian GUO   

  1. School of Mechanical and Electrical Engineering，Lanzhou University of Technology，Lanzhou 730050，China
  • Received:2019-06-13 Online:2020-09-01 Published:2020-09-16
  • Contact: Tao LIU E-mail:942516726@qq.com;liutao1971@lut.cn

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Abstract:

On the basis of in-depth study of scroll compressor profile construction, a new method for constructing scroll profiles using Frenet moving frame was proposed, a new type of variable wall thickness scroll profile was constructed by this method. The basic geometrical theory of the profile was established and the working chamber volume was also derived. On this basis, four performance indexes including compression ratio, area utilization coefficient, axial gas force and tangential gas force were introduced to evaluate its performance. The results show that under the same geometrical parameters, the newly constructed variable wall thickness scroll profiles have better performance than traditional variable wall thickness scroll profile. Not only the compression ratio and the area utilization coefficient are increased by 7.15% and 4.84% respectively, but also the axial gas force and tangential gas force are also significantly smaller. It can be seen that the use of this variable wall thickness scroll profile helps to further improve the performance of the scroll compressor.

Key words: mechanic design, scroll compressor, Frenet moving frame, variable wall thickness scroll profile, geometrical theory, performance index, gas force

CLC Number: 

  • TH45

Fig.1

Schematic diagram of differential geometry relation for scroll profile"

Fig.2

Generating line of variable wall thickness scroll profiles"

Fig.3

Generation schematic diagram of inner and outer wall profiles for scroll teeth"

Fig.4

Incomplete variable wall thickness scroll tooth"

Fig.5

Variable wall thickness scroll tooth"

Fig.6

Compression chamber of variable wall thickness scroll compressor"

Fig.7

Discharge chamber consisting of modified circular arcs and circle involutes"

Fig.8

Tangential gas force exerted on orbiting scroll"

Table 1

Comparison of geometric performance of two scroll profiles"

型线类型压缩比ν面积利用系数ε
Δ/%7.154.84
传统变壁厚涡旋型线8.5710.640
新型变壁厚涡旋型线9.1840.671

Fig.9

Axial gas force variation curve"

Fig.10

Tangential gas force variation curve"

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