A compressor unit includes a compressor body with a compression mechanism, and an accumulator. The compression mechanism includes a cylinder, a piston, and a blade. F?(h/I)?L?19?P+128. F represents a value obtained by multiplying a weight of the piston and the blade by a square of the number of revolutions of the compressor body, and h represents a distance from a center of the piston in a thickness direction to a center of gravity of the compressor unit. I represents a moment of inertia around a center axis of the compressor unit passing through the center of gravity of the compressor unit. L represents a distance from an axis of an inlet pipe of the accumulator to the center of gravity of the compressor unit, and P represents a refrigeration apparatus rated capacity.

A compressor includes fixed and movable members with a discharge port penetrating the fixed member and a discharge valve body to open and close the discharge port. An inflow end of the discharge port has a hydraulic diameter Di=4?(Ai/Li), where Ai is an area of the inflow end and Li is a circumferential length at the inflow end. An outlet flow path is formed between an outflow end of the discharge port and the valve body. The outlet flow path has a cross-sectional area Ao=Lo?ho, and a hydraulic diameter Do=4?{Ao/(Lo+Lv)}, where Lo is a circumferential length at the outflow end, ho is a reference lift amount of the valve body, and Lv is a circumferential length of a valve head of the valve body in contact with the outflow end. A ratio Do/Di at the inflow end is 0.602 to 0.740.

A vane for a vane cell vacuum pump. The vane can be rotated about an axis of rotation by a rotor in a pump chamber and guided in the longitudinal direction in the rotor, with an upper side and a lower side to abut against the bottom and the ceiling of the pump chamber, with a rear side opposite a front side to limit the pressure chambers, with at least one face to slidably abut against an inside wall of the pump chamber on the casing side. The vane comprises a base body of a first plastic material and a vane end molded of a second plastic material to the base body forming the face. The base body comprises a mounting section around which the vane end is formed. The mounting section comprises at least one recess transverse to the front side and/or the rear side.

A vane for a vane cell vacuum pump. The vane can be rotated about an axis of rotation by a rotor in a pump chamber and guided in the longitudinal direction in the rotor, with an upper side and a lower side to abut against the bottom and the ceiling of the pump chamber, with a rear side opposite a front side to limit the pressure chambers, with at least one face to slidably abut against an inside wall of the pump chamber on the casing side. The vane comprises a base body of a first plastic material and a vane end molded of a second plastic material to the base body forming the face. The base body comprises a mounting section around which the vane end is formed. The mounting section comprises at least one recess transverse to the front side and/or the rear side.

A vane for a vane cell vacuum pump. The vane can be rotated about an axis of rotation by a rotor in a pump chamber and guided in the longitudinal direction in the rotor, with an upper side and a lower side to abut against the bottom and the ceiling of the pump chamber, with a rear side opposite a front side to limit the pressure chambers, with at least one face to slidably abut against an inside wall of the pump chamber on the casing side. The vane comprises a base body of a first plastic material and a vane end molded of a second plastic material to the base body forming the face. The base body comprises a mounting section around which the vane end is formed. The mounting section comprises at least one recess transverse to the front side and/or the rear side.

A vane for a vane cell vacuum pump. The vane can be rotated about an axis of rotation by a rotor in a pump chamber and guided in the longitudinal direction in the rotor, with an upper side and a lower side to abut against the bottom and the ceiling of the pump chamber, with a rear side opposite a front side to limit the pressure chambers, with at least one face to slidably abut against an inside wall of the pump chamber on the casing side. The vane comprises a base body of a first plastic material and a vane end molded of a second plastic material to the base body forming the face. The base body comprises a mounting section around which the vane end is formed. The mounting section comprises at least one recess transverse to the front side and/or the rear side.

A compressor includes fixed and movable members with a discharge port penetrating the fixed member and a discharge valve body to open and close the discharge port. An inflow end of the discharge port has a hydraulic diameter Di=4(Ai/Li), where Ai is an area of the inflow end and Li is a circumferential length at the inflow end. An outlet flow path is formed between an outflow end of the discharge port and the valve body. The outlet flow path has a cross-sectional area Ao=Loho, and a hydraulic diameter Do=4{Ao/(Lo+Lv)}, where Lo is a circumferential length at the outflow end, ho is a reference lift amount of the valve body, and Lv is a circumferential length of a valve head of the valve body in contact with the outflow end. A ratio Do/Di at the inflow end is 0.602 to 0.740.