Abstract:
The centrifugal refrigeration compressor (2) includes a hermetic housing (3); a drive shaft (4) including a first axial end portion (5), a second axial end portion (6) and an intermediate portion (7), the drive shaft (4) further including a central axial bore (8); a first and a second compression stage (9, 11) respectively including a first and a second impeller (16, 17) connected to the first axial end portion (5) of the drive shaft (4); an electrical motor (19) configured for driving in rotation the drive shaft (4) and including a stator and a rotor, the rotor being connected to the second axial end portion of the drive shaft (4); a fixed shaft element secured to the hermetic housing (3) and extending partially into the central axial bore (8) of the drive shaft (4); and a radial bearing arrangement configured for rotatably supporting the drive shaft (4), the radial bearing arrangement being arranged between an outer surface of the fixed shaft element and an inner surface of the drive shaft (4).
Abstract:
The centrifugal turbo-compressor (2) includes a hermetic casing; a drive shaft (6); a first and a second compression stage (12, 13) configured to compress a refrigerant and respectively including a first and a second impeller (18, 19) connected to the drive shaft (6) and being arranged in a back-to-back configuration; an interstage sealing device provided between the first and second impellers (18, 19). The hermetic casing includes a main casing portion (4) in which are arranged the first and second compression stages (12, 13) and the inter-stage sealing device. The first and second compression stage (12, 13) respectively includes a first and a second aerodynamic member (29, 31) each having an annular disc shape and respectively facing front-sides (21, 22) of the first and second impellers (18, 19).
Abstract:
A scroll compressor including an Oldham coupling lubrication system The scroll compressor (1) includes a first fixed scroll (4), an orbiting scroll arrangement (7), a first Oldham coupling (51) configured to prevent rotation of the orbiting scroll arrangement (7) with respect to the first fixed scroll (4) and including at least a pair of first engaging elements (54) respectively slidably engaged with a pair of complementary engaging elements (56) provided on the first fixed scroll (4), an oil sump, and a lubrication system configured to lubricate at least partially the first engaging elements (54) of the first Oldham coupling (51) with oil supplied from the oil sump.
Abstract:
The double-stage impeller arrangement (17) includes a first impeller (18) and a second impeller (19), each of the first and second impellers (18, 19) having a front-side (21, 22) and a back-side (25, 26), the first and second impellers (18, 19) being configured to be connected to a drive shaft (4) of the double-stage centrifugal turbo-compressor (2) and being arranged in a back-to-back configuration; a radial annular groove formed between the back-sides (25, 26) of the first and second impellers (18, 19); and an inter-stage sealing device provided between the first and second impellers (18, 19). The second impeller (19) is distinct and separated from the first impeller (18) so as to enable an adjustment of an axial distance between the back-sides (25, 26) of the first and second impellers (18, 19), and the inter-stage sealing device includes a one-piece sealing member (32) having an annular disc shape and being at least partially arranged within the radial annular groove.
Abstract:
This scroll compressor includes a scroll compression unit including a first fixed scroll including a first fixed base plate and a first fixed spiral wrap, an orbiting scroll arrangement (7) including a first orbiting spiral wrap (14), the first fixed spiral wrap and the first orbiting spiral wrap (14) forming a plurality of first compression chambers. The scroll compressor further includes a refrigerant suction part suitable for supplying the scroll compression unit with refrigerant to be compressed. The orbiting scroll arrangement (7) further includes a first orbiting guiding portion (21) extending from an outer end portion of the first orbiting spiral wrap (14) and configured to guide, in use, at least a part of the refrigerant supplied to the scroll compression unit towards the first compression chambers.
Abstract:
This scroll compressor includes a closed container, a scroll compression unit (3) including a first fixed scroll (4) having a first fixed base plate (8) and a first fixed spiral wrap partially delimiting a first refrigerant inlet passage (P1), and an orbiting scroll arrangement (7) including a first orbiting spiral wrap (14), the first fixed spiral wrap and the first orbiting spiral wrap (14) forming a plurality of first compression chambers. The scroll compressor further includes a drive shaft adapted for driving the orbiting scroll arrangement (7) in an orbital movement, and a refrigerant suction duct (19) suitable for supplying the scroll compression unit (3) with refrigerant to be compressed. The refrigerant suction duct (19) includes a refrigerant supplying portion (19c) oriented towards the first refrigerant inlet passage (P1) and configured to conduct, in use, at least a part of the refrigerant suctioned in the refrigerant suction duct (19) towards the first refrigerant inlet passage (P1 ).
Abstract:
Compresseur frigorifique à spirales à vitesse variable Ce compresseur comprend une enceinte étanche délimitant un volume d'aspiration et un volume de compression disposés respectivement de part et d autre d un corps (5) contenu dans l enceinte, un circuitd injection d huile alimenté en huile à partir d'huile contenue dans un carter (22) et agencé pour injecter de l'huile dans le volume de compression, le circuit d'injection d huile comprenantune électrovanne (25) comportant un corps (26) fixé sur la paroi de l'enceinte étanche et un noyau (34) mobile, sous l effet d un champ magnétique, entre une position de fermeture permettant une injection d'huile dans le volume de compression et une position d'ouverture empêchant ou limitant l'injection d huile dans le volume de compression. Le compresseur comprend des moyens de commande agencés pour déplacer le noyau (34) de l'électrovanne entre ses positions d ouverture et de fermeture en fonction de la vitesse du compresseur et/ou de la température de refoulement du gaz frigorigène.
Abstract:
The fluid machine includes a stationary member (6), a rotary member (5) and a labyrinth seal (9) including a succession of stationary steps (11) formed on the stationary member (6), and a succession of rotary steps (14) formed on the rotary member (5). The labyrinth seal (9) further includes a plurality of stationary recesses (18) each formed in a radial wall portion (12) of a respective stationary step (11), and a plurality of rotary recesses (21) each formed in a radial wall portion (16) of a respective rotary step (14). Each stationary step (11) defines a stationary projection (19) delimited by the stationary recess (18) formed on said stationary step (11), and each rotary step (14) defines a rotary projection (22) delimited by the rotary recess (21) formed on said rotary step (14). The axial width (Wr) of each of the stationary recesses (18) and of the rotary recesses (21) substantially equals the axial width (Wp) of each of the stationary projections (19) and of the rotary projections (22).
Abstract:
The scroll compressor (1) includes an orbiting scroll arrangement (7), and a drive shaft (18) configured to drive the orbiting scroll arrangement (7) in an orbital movement, the drive shaft (18) including a lubrication channel (32) and a first lubrication hole (35) fluidly connected to the lubrication channel (32) and emerging in an outer wall of the drive shaft (18). The scroll compressor (1 ) further includes a first and a second bearings (38, 39) axially offset along a rotation axis of the drive shaft (18) and each configured to engage the drive shaft (18). The first and second bearings (38, 39) and the drive shaft (18) partially define a first annular gap (44) in which emerges the first lubrication hole (35). The first bearing (38) and the drive shaft (18) define a first oil recess fluidly connected to the first annular gap (44), and the second bearing (39) and the drive shaft (18) define a second oil recess fluidly connected to the first annular gap (44).
Abstract:
This scroll compressor (2) includes a first and second fixed scrolls (4, 5) comprising first and second fixed spiral wraps (9, 12), an orbiting scroll arrangement (7) comprising first and second orbiting spiral wraps (14, 15), the first fixed spiral wrap (9) and the first orbiting spiral wrap (14) forming a plurality of first compression chambers (16) and the second fixed spiral wrap (5) and the second orbiting spiral wrap (15) forming a plurality of second compression chambers (17). The scroll compressor further includes a drive shaft (23) adapted for driving the orbiting scroll arrangement (7) in an orbital movement, and a driving motor (24) arranged for driving in rotation the drive shaft (23) about a rotation axis, the driving motor (24) being located nearby the first fixed scroll (4). The first fixed scroll (4) includes at least one first discharge passage (21 ) arranged to conduct the refrigerant compressed in the first compression chambers (16) towards the driving motor (24).