Leaf spring, leaf spring group, and compressor

A leaf spring comprising:

• at least two spring arms, each spring arm of same structure;
• an inner fixing hole, the at least two spring arms evenly distributed around a center of the inner fixing hole;
• and
• an outer fixing hole disposed at an outermost end of each spring arm;
• wherein each of the at least two spring arms is contoured by two concentric vortex lines, a first vortex line and a second vortex line;
• a start end of each spring arm is contoured by connecting start ends of the first vortex line and the second vortex line with circular arcs which are concentric with the inner fixing hole;
• a tail end of each spring arm is contoured by two or three segments of circular arcs and two concentric vortex lines, and the segments of circular arcs are tangent to the two concentric vortex lines;
• and a circular arc at the outermost tail end is concentric with the outer fixing hole;
• the two concentric vortex lines respectively meet equations:
• X(t)=a*[cos(t)+t*sin(t)],
• Y(t)=a*[sin(t)−t*cos(t)];
• and
• x(t)=(a+b)*[cos(t)+(t+α)*sin(t)]
• y(t)=(a+b)*[sin(t)−(t+α)*cos(t)];
• wherein, X, Y, x, and y are coordinate values, a and a+b are coefficients of radius, t is a variable, α is an initial angle, and 0.5≦a≦30, 0<b≦10, 0 rad<t≦30 rad, and 0 rad<α≦150 rad.