Rotary compressor with the balance weight formed with a recess for receiving the head of a rivet

Patent metadata

Field	Value
Publication number	US-9748815-B2
Application number	US-201314432165-A
Country	US
Kind code	B2
Filing date	Jun 19, 2013
Priority date	Sep 28, 2012
Publication date	Aug 29, 2017
Grant date	Aug 29, 2017

Abstract

A rotary compressor includes a casing, an electric motor, a compression mechanism and a balance weight mechanism. The electric motor includes a stator fixed to the casing, and a rotor. The compression mechanism is connected to the electric motor via a drive shaft. The balance weight mechanism is configured to cause centrifugal force to act on the drive shaft. The rotor includes a rotor core including a plurality of stacked electromagnetic steel sheets, and a rivet configured to clamp the rotor core at axial ends of the rotor core. The balance weight mechanism includes an insertion portion into which drive shaft is press fit, and a flat portion forming a flat surface at an axial end of the drive shaft. The balance weight mechanism is disposed at an axial end portion of the rotor to cover a head of the rivet.

First claim

What is claimed is:

1. A rotary compressor comprising:
a casing;
an electric motor including a stator fixed to the casing, and a rotor;
a compression mechanism connected to the electric motor via a drive shaft; and
a balance weight mechanism configured to cause centrifugal force to act on the drive shaft,
the rotor including
a rotor core including a plurality of stacked electromagnetic steel sheets, and
a rivet configured to clamp the rotor core at axial ends of the rotor core,

the balance weight mechanism including
an insertion portion into which drive shaft is press fit, and
a flat portion forming a flat surface at an axial end of the drive shaft, and a recess into which the head of the rivet fits, and

the balance weight mechanism being disposed at an axial end portion of the rotor to cover a head of the rivet.

2. The rotary compressor of claim 1 , wherein
the recess is formed on an end portion of the balance weight mechanism at the rotor.

Assignees

• Daikin Ind Ltd

Inventors

• Tanaka Kouichi
• Hori Kazutaka
• Shimizu Takashi

Classifications

• H02K1/28

  Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures · CPC title

• H02K7/04 Primary

  Balancing means · CPC title

• F04C23/008

  Hermetic pumps · CPC title

• F04C18/30

  having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members · CPC title

• F04C29/0085

  Prime movers · CPC title