Variable-section scroll tooth of scroll compressor and profile design method of variable-section scroll tooth

The invention discloses a variable-section scroll tooth of a scroll compressor and a profile design method of the variable-section scroll tooth. The profile of the scroll tooth is a variable circle radii involute based on a trigonometric function, namely, a trigonometric function involute; the profile of a static scroll tooth (1) comprises a first trigonometric function involute AB and a fourth trigonometric function involute GH, and the profile of a dynamic scroll tooth (2) comprises a second trigonometric function involute CD and a third trigonometric function involute EF; the dynamic scroll tooth (2) and the static scroll tooth (1) can be meshed correctly in the work process. According to the variable-section scroll tooth, the profile is simple, the number of rings of the scroll tooth and the length of a leakage line can be reduced due to the fact that the tooth thickness of the outer ring and that of the center of the static scroll tooth are relatively small and the tooth thickness of the middle of the st