Compressor

Abstract

With respect to a first plane S1 containing a center axis 1a of a screw rotor 1, a second plane S2 which intersects orthogonally with the screw rotor center axis 1a, and a third plane S3 which intersects orthogonally with the first plane S1 and the second plane S2, the center axis (2a) of the gate rotor 2 is on the third plane S3, and the tooth portions 20 of the gate rotor 2 do not overlap with the first plane S1 as viewed in a direction orthogonal to the third plane S3.

Description

technical field [0001] The present invention relates to a compressor used in, for example, an air conditioner or a refrigerator. Background technique [0002] Conventionally, there is a compressor that has a disc-shaped screw rotor that rotates around a central axis and that has a plurality of grooves extending helically outward in the radial direction from the central axis on an end surface in the direction of the central axis. and a gate rotor, which rotates around a central axis, and has a plurality of teeth arranged in the circumferential direction on the outer periphery, and the grooves of the screw rotor mesh with the teeth of the gate rotor to form a compression chamber (refer to Japanese Patent Publication No. Bulletin No. 60-10161). [0003] That is, this compressor is a so-called PP type single-screw compressor. The "PP type" means that the screw rotor is formed in a plate shape, and the gate rotor is also formed in a plate shape. [0004] Furthermore, when view...

AI Technical Summary

Problems solved by technology

[0006] However, in the conventional compressor described above, since all the tooth portions of the gate rotor overlap the screw rotor central axis when viewed from a direction perpendicular to the screw rotor central axis and the gate rotor central axis, the On a plane perpendicular to the plane of the gate rotor and including the rotation direction of the tooth centerline of the gate rotor, the difference between the maximum value and the minimum value of the angle formed by the groove side of the screw rotor with respect to the tooth side of the gate rotor is large

[0007] Therefore, the edge angle of the sealing portion of the gate rotor that engages with the side surface of the groove of the screw rotor becomes sharper, and the air holes (leakage gaps) existing in the meshing portion between the groove of the screw rotor and the tooth portion of the gate rotor become sharper. Large, the compression efficiency is reduced

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