Rotary compressor and refrigeration cycle device

Abstract

A rotary compressor is provided with a hermetic case (1); a motor section (3) arranged in the hermetic case (1); a compression mechanism section (2) driven by the motor section (3) through a main shaft (20) to eject a compressed gas from an ejection valve (12a) facing the motor section (3); and an upper valve cover (14) fixed to the compression mechanism section (2) with a bolt (16) to cover the ejection valve (12a). The motor section (3) and the compression mechanism section (2) are arranged to face each other with an interval of 2-8mm between the motor section (3) and the bolt (16) of the upper valve cover (14).

Description

technical field [0001] The present invention relates to, for example, a rotary compressor and a refrigeration cycle device constituting a refrigeration cycle circuit of an air conditioner or the like. Background technique [0002] In general, a rotary compressor used in a refrigeration cycle such as an air conditioner includes a compression mechanism for compressing fluid and a motor that drives the compression mechanism through a main shaft (rotary shaft) in a hermetically sealed casing. [0003] Conventionally, in this type of rotary compressor, there has been a problem of increased electromagnetic noise in the motor unit due to the concentrated winding of the stator constituting the motor unit and the use of rare earth permanent magnets in the rotor. In particular, when the natural frequency of the rotor / spindle system becomes an integral multiple of the operating frequency of the compressor, there is a problem that the vibration of the rotor increases and electromagnetic...

AI Technical Summary

Problems solved by technology

[0007] However, in the structure described in Japanese Patent Application Laid-Open No. 2002-371962, the valve cover cannot be sufficiently inserted into the coil end of the stator or the inner circumference of the bobbin as an insulating member, so that the rotor and the compression mechanism cannot be brought close together.

Therefore, the natural frequency of the rotor and the main shaft system cannot be sufficiently increased, the vibration of the rotor increases during compressor operation, electromagnetic noise and vibration cannot be sufficiently suppressed, and the overall height of the compressor cannot be sufficiently reduced

[0008] In addition, although the structure described in Japanese Patent Laid-Open No. 2001-263239 can reduce electromagnetic noise and reduce the overall height of the compressor, the upper surface of the valve cover, the lower surface of the rotor, the coil ends of the stator, or the The space surrounded by the bobbin is similar to a closed space

Therefore, the resonance noise increases, and finally there is still a problem that the noise cannot be reduced

Images