A screw rotor which is hollow has improved performance against heat, pressure, rust, and the like. A screw rotor includes a screw portion of which an outer periphery has teeth and grooves having a helical shape and extending by a predetermined length in an axial direction. A radial cross section of at least a part of the screw portion includes a cross section of an outer surface portion forming the teeth and the grooves, a cross section of an axial center portion, a cross section of a support portion that connects an axial center side of the outer surface portion and an outer diameter side of the axial center portion, and a cross section of a hollow portion formed by the support portions adjacent to each other in a rotational direction and an axial center side inner surface of a tooth bottom or a tooth tip. In at least the radial cross section of the screw portion, different members are continuously joined as an integral structure in a cross section of at least one of the axial center portion and the support portion and the outer surface portion.

A screw rotor which is hollow has improved performance against heat, pressure, rust, and the like. A screw rotor includes a screw portion of which an outer periphery has teeth and grooves having a helical shape and extending by a predetermined length in an axial direction. A radial cross section of at least a part of the screw portion includes a cross section of an outer surface portion forming the teeth and the grooves, a cross section of an axial center portion, a cross section of a support portion that connects an axial center side of the outer surface portion and an outer diameter side of the axial center portion, and a cross section of a hollow portion formed by the support portions adjacent to each other in a rotational direction and an axial center side inner surface of a tooth bottom or a tooth tip. In at least the radial cross section of the screw portion, different members are continuously joined as an integral structure in a cross section of at least one of the axial center portion and the support portion and the outer surface portion.

A rotary vane pump includes a housing that includes first and second plates respectively secured to first and second opposing sides of an intermediate plate. The intermediate plate includes a bore and inlet and outlet ports. The first and second sides respectively have first and second passages that are respectively in fluid communication with the inlet and outlet ports. The first and second passages are in fluid communication with the bore. The intermediate plate is reversible with respect to the first and second plates. A rotor is arranged in the bore. The rotor supports slidable vanes that are configured to pump fluid between the inlet and outlet ports.

An electric compressor, an inverter assembly jig and an inverter manufacturing method, an inverter of the compressor includes a frame coupled to a circuit board, the frame includes a base plate opposite the circuit board, fixing means protruding from the base plate and supporting an outer periphery of the circuit board, and a through-hole formed at a position corresponding to the fixing means, the inverter assembly jig includes an expansion pin inserted into the through-hole, and an expansion pin actuation mechanism moving the expansion pin closer to and away from the fixing means, the inverter method includes inserting the expansion pin into the through-hole, manipulating the expansion pin actuation mechanism to deform the fixing means, seating the circuit board on the base plate, and manipulating the expansion pin actuation mechanism so that the fixing means is restored and coupled to the circuit board.

A high suction pressure thrust load balance assembly configured for use with a single screw compressor includes comprises a sealing baffle that is keyed to, so as to be rotatable along with, a main rotor drive shaft of the single screw compressor. The sealing baffle is configured to create a force or load to counteract the axial force of the main rotor drive shaft created during rotation of the main rotor drive shaft using the pressurized oil used to lubricate the mechanical shaft seal of the compressor.

A compressor assembly becomes a compressor as a result of a terminal guard being attached. The compressor assembly includes a body, and a terminal guard mounting seat attached to an outer surface of the body. The terminal guard is attachable to the terminal guard mounting seat. A compressor includes the compressor assembly and the terminal guard. The compressor can be manufactured by attaching the terminal guard mounting seat to the outer surface, administering metal spraying to at least part of the outer surface after attaching the terminal guard mounting seat, and attaching the terminal guard to the terminal guard mounting seat after the administering metal spraying.

The present invention provides a method for cleaning a component for use in an ultra-high vacuum. The method may comprise the steps of placing the component to be cleaned in a vacuum furnace chamber; plasma cleaning the component at a temperature of greater than about 80° C.; and evacuating the chamber to a pressure of less than about 10E-5 mbar. Apparatus for performing such methods and kits comprising said components are also provided.

In a compressor compressing a refrigerant including hydrocarbon fluoride prone to disproportionate, provided, on a contact portion of the drive shaft and the bearing portion, is an elastic bearing portion as a heat generation suppression portion suppressing excessive heat generation due to line contact of an end edge portion of the bearing portion with the drive shaft during rotation of the drive shaft.

A scroll compressor comprising: a fixed scroll and a moving scroll, the moving scroll being configured to be capable of orbiting relative to the fixed scroll in order to compress fluid; a main bearing base supporting the moving scroll; and an axial flexible mounting mechanism, the fixed scroll being connected to the main bearing base by means of the axial flexible mounting mechanism, such that the fixed scroll can move a predetermined distance along the axial direction, the axial flexible mounting mechanism comprising a bolt and a sleeve arranged on the outer circumference of the bolt, the sleeve comprising in the axial direction a first section in contact with the main bearing base and a second section in contact with the fixed scroll, and the first section being configured such that the bending rigidity in the radial direction is different to the bending rigidity in the tangential direction.

A scroll compressor comprising: a fixed scroll and a moving scroll, the moving scroll being configured to be capable of orbiting relative to the fixed scroll in order to compress fluid; a main bearing base supporting the moving scroll; and an axial flexible mounting mechanism, the fixed scroll being connected to the main bearing base by means of the axial flexible mounting mechanism, such that the fixed scroll can move a predetermined distance along the axial direction, the axial flexible mounting mechanism comprising a bolt and a sleeve arranged on the outer circumference of the bolt, the sleeve comprising in the axial direction a first section in contact with the main bearing base and a second section in contact with the fixed scroll, and the first section being configured such that the bending rigidity in the radial direction is different to the bending rigidity in the tangential direction.