fluid machine connected to a drive source via a magnetic coupling

Abstract

The present invention aims to propose a fluid machine in which a magnetic coupling includes an outer rotor 32 to the cylinder-bottom part of which a drive shaft of the drive component is connected, outer rotor side magnets 33 placed on an inner periphery of the outer rotor, an inner rotor 23 fitted to a drive shaft of the fluid machine, inside the outer rotor, inner rotor side magnets 21 placed on an outer periphery of the inner rotor, whereby attraction workings and repulsion workings between the outer rotor side magnets and the inner rotor side magnets transmit torques of the drive component to the fluid machine, and a sealing assembly 20 a partition part of which is placed between the inner rotor 23 and the outer rotor 32 and surrounds a drive shaft of the fluid machine so as to secure gas-tightness, the shaft including the inner rotor 23 and the inner rotor side magnets 21 ; further an air ventilation device for ventilating a space inside the outer rotor by means of inducing and/or discharging ambient air is provided into the outer rotor 32 of the magnetic coupling so as to cool the sealing assembly 20 and the outer rotor side magnets 33.

1 . A fluid machine connected to the drive component via a magnetic coupling, comprising of,
 a drive component, and   a fluid machine composed of a pump unit including compressors, being connected to the drive component via a magnetic coupling;   said magnetic coupling comprising,   an outer rotor to the cylinder-bottom part of which a drive shaft of the drive component is connected,   outer rotor side magnets placed on an inner periphery of the outer rotor,   an inner rotor fitted to a drive shaft of the fluid machine, inside the outer rotor, and   inner rotor side magnets placed on an outer periphery of the inner rotor, whereby attraction workings and repulsion workings between the outer rotor side magnets and the inner rotor side magnets transmit torques of the drive component to the fluid machine;   the fluid machine being provided with a pair of sealing assemblies that encloses both end parts of a drive shaft of the fluid machine so as to bring the fluid machine a gas-tightly sealed condition except that there are a gas inlet port, a gas outlet port, and compression gas inlets;   wherein an air ventilation device for ventilating a space inside the outer rotor by means of inducing and/or discharging ambient air is provided in the outer rotor of the magnetic coupling so as to cool the sealing assembly of the magnetic coupling side, and the outer rotor side magnets.   
   
   
       2 . A fluid machine connected to the drive component via a magnetic coupling of  claim 1 , wherein the air ventilation device composed of blades and/or slits, the blades being fitted into a periphery part of the outer rotor with an inclination to a rotational direction of the outer rotor and the slits for ventilation being formed space from a blade to a blade. 
   
   
       3 . A fluid machine connected to the drive component via a magnetic coupling of  claim 1 , wherein the air ventilation devices are installed in a drive component side cylinder-bottom part of the outer rotor, in a cylinder-periphery part of the outer rotor, in a cylinder-periphery part of the outer rotor between the outer rotor side magnets attached on inner periphery of the outer rotor, in a fluid machine side cylinder-periphery end-part of the outer rotor, or in the plural locations among said locations. 
   
   
       4 . A fluid machine connected to the drive component via a magnetic coupling of  claim 1 , wherein the air ventilation devices are provided at both of the fluid machine side and the drive component side across an band area of the cylinder-periphery part of the outer rotor where the outer rotor side magnets are located, a part of the ventilation devices playing role of upstream passages and the remaining devices playing role of downstream passages, whereby passage resistance of the downstream passages is smaller than that of the upstream passages or whereby inducing momentum of the upstream passages is larger than that of the down stream passages.