Helium enclosed compressor

Abstract

The helium enclosed compressor uses a helium gas as a working gas, houses a compressor section and a motor section including a stator having coil ends and a stator within an enclosed vessel, and discharges the helium gas, which has been discharged into the enclosed vessel from a discharge port of the compressor section, to the outside of the enclosed vessel through the coil ends. A plurality of varnish-treated layers which becomes insulating films is formed on the surface of a coil which constitutes the coil ends. Thereby, a helium enclosed compressor capable of preventing insulation breakdown of the coil ends caused by corona discharge is obtained.

1 . A helium enclosed compressor in which
 a helium gas is used as a working gas,   a compressor section, and a motor section including a stator having coil ends, and a rotor is housed within an enclosed vessel, and   the helium gas, which has been discharged into the enclosed vessel from a discharge port of the compressor section, is discharged to the outside of the enclosed vessel through the coil ends,   wherein a plurality of varnish-treated layers which becomes insulating films is formed on the surface of a coil which constitute the coil ends.   
   
   
       2 . The helium enclosed compressor according to  claim 1 , further comprising an inverter which controls the number of rotations of the motor section. 
   
   
       3  The helium enclosed compressor according to  claim 1 ,
 wherein an enamel-coated coil is used as the coil which constitutes the coil ends, and an epoxy-based varnish material is used for the varnish-treated layers.   
   
   
       4 . A helium enclosed compressor in which
 a helium gas is used as a working gas,   a compressor section, and a motor section including a stator having coil ends and a rotor are arranged vertically and housed within an enclosed vessel,   the inside of the enclosed vessel is partitioned into a discharge chamber and a motor chamber by a frame,   a first rectangular passage which allows the discharge chamber to communicate with the motor chamber is provided between an outer peripheral surface of the frame and an inner wall surface of the enclosed vessel,   a second passage which allows an upper motor chamber in an upper portion of the stator to communicate with a lower motor chamber having an oil reservoir at a bottom of a lower portion of the stator is provided between an outer peripheral surface of the stator and the inner wall surface of the enclosed vessel,   the compressor section is adapted such that a stationary scroll having a spiral wrap standing upright at a disk-like panel and an orbiting scroll having a spiral wrap standing upright at a disk-like panel are made to mesh with each other while their wraps face the inside, and the orbiting scroll is made to orbit, thereby sucking the helium gas from a suction port of an outer peripheral portion of the stationary scroll, and discharging the helium gas into the discharge chamber from a discharge port of a central portion of the stationary scroll, and   an oil injection mechanism section is provided to connect an oil injection pipe for cooling the helium gas to an oil injection port provided in the panel of the stationary scroll through the enclosed vessel,   wherein a plurality of varnish-treated layers which becomes insulating films is formed on the surface of a coil which constitutes the coil ends, and   the external diameter of the coil end on the downstream side of the first passage is increased to increase the coil density of the coil ends, and the gap dimension between outer peripheries of the coil ends and the inner wall surface of the enclosed vessel is made smaller than the height of an opening of the first passage.   
   
   
       5 . The helium enclosed compressor according to  claim 4 ,
 wherein an enamel-coated coil is used as the coil which constitutes the coil ends, and an epoxy-based varnish material is used for the varnish-treated layers.   
   
   
       6 . The helium enclosed compressor according to  claim 4 ,
 wherein the stator has a stator core and the coil ends which protrude on both sides of the stator core, a core cut portion is formed in the outer peripheral surface of the stator core so that a passage which allows an upper portion and a lower portion of the stator core to communicate with each other is provided between an outer peripheral surface of the stator core and the inner wall surface of the enclosed vessel, and the external diameter of the coil ends is increased to an external diameter almost equal to the external diameter of the stator core in the core cut portion, thereby increasing the coil density of the coil ends.   
   
   
       7 . A helium enclosed compressor in which
 a helium gas is used as a working gas,   a compressor section, and a motor section including a stator having coil ends and a rotor are housed within an enclosed vessel,   the inside of the enclosed vessel is partitioned into a discharge chamber and a motor chamber by a frame,   the compressor section is adapted such that a stationary scroll having a spiral wrap standing upright at a disk-like panel and an orbiting scroll having a spiral wrap standing upright at a disk-like panel are made to mesh with each other while their wraps face the inside, and the orbiting scroll is made to orbit, thereby sucking the helium gas from a suction port of an outer peripheral portion of the stationary scroll, and discharging the helium gas into the discharge chamber from a discharge port of a central portion of the stationary scroll, and   an inverter is provided to control the number of rotations of the motor section,   wherein a plurality of varnish-treated layers which becomes insulating films is formed on the surface of a coil which constitutes the coil ends.   
   
   
       8 . The helium enclosed compressor according to  claim 7 ,
 wherein the operating pressure within the enclosed vessel is set to a range of 1.5 MPaG to 3.0 MPaG.   
   
   
       9 . The helium enclosed compressor according to  claim 7 ,
 wherein the stator has a stator core and the coil ends which protrude on both sides of the stator core, a core cut portion is formed in the outer peripheral surface of the stator core so that a passage which allows an upper portion and a lower portion of the stator core to communicate with each other is provided between an outer peripheral surface of the stator core and the inner wall surface of the enclosed vessel, and the external diameter of the coil ends is increased to an external diameter almost equal to the external diameter of the stator core in the core cut portion, thereby increasing the coil density of the coil ends.