| 摘要 |
PCT No. PCT/SE79/00181 Sec. 371 Date May 2, 1980 Sec. 102(e) Date May 2, 1980 PCT Filed Sep. 6, 1979 PCT Pub. No. WO80/00591 PCT Pub. Date Apr. 3, 1980.A gear machine comprises two helical gears (1, 2) in mutual mesh for compressing or pumping a fluid. The suction side of the machine can be made conventionally. The outlet port (4) of the machine is made as a plurality of holes (14), extending in towards the meshing zone at one side of the gear pair. The plurality of holes opens at one end (14a) within a Y-shaped area comprising the union of the surfaces which are each defined by the respective gear top and bottom circles (K, L) between a plane (P) through the axes of the gears and a gear radius (R) forming an angle to the axis plane at most attaining B x (1/R) x tangent beta , where B is the width of the gear pair, R is the outside circle radius of the respective gear, and beta is the helix angle of the gears. At their other ends (14b), said holes are connected to a duct (6) at axially separated places in the duct, in the same order as they in the peripheral direction of the gears, open out onto said end surface. A sealing piston (7) is displaceably arranged in the duct, and one end (0) of the duct communicates with the fluid outlet of the machine so that the machine can be controlled at a constant rate of revolutions by displacing the piston in the duct. |
