Abstract:
This compression device comprises first and second compressors mounted in parallel, a suction line intended to be connected to an outlet of an evaporator, first and second suction conduits arranged for putting the suction line respectively in communication with the admission orifices of the first and second compressors, and an oil level equalization conduit connecting the oil pans of the first and second compressors. The compression device further comprises an oil separator mounted on the suction line or on the second suction conduit, and an oil return conduit arranged for connecting an oil outflow orifice of the oil separator to the oil pan of the first compressor.
Abstract:
The compressor includes a sealed enclosure containing a compression stage, an electric motor having a stator and a rotor, an oil pump rotationally coupled to the rotor, including an oil inlet port connected to an oil sump, and control means arranged to command the operation of the motor in a start-up mode in which the rotor is rotated at a first speed of rotation included in a first speed range, and a normal operating mode in which the rotor is rotated at a second speed of rotation included in a second speed range higher than the first speed range. The compressor includes an oil injection device having an oil injection duct connected to a first oil outlet port of the oil pump and arranged to supply the compression stage with oil.
Abstract:
The oil injection device according to the invention includes an oil pump designed to be rotationally coupled to the electric motor of a compressor and including inlet and outlet ports, an oil injection duct connected to the first outlet port and designed to supply a compression stage of the compressor with oil, and an oil return duct connected to the first outlet port and designed to return the oil into an oil sump of the compressor. The pressure losses in the oil injection duct are primarily singular pressure losses proportional to the square of the oil flow rate passing through the oil injection duct. The pressure losses in the oil return duct are primarily pressure losses due to friction proportional to the oil flow rate passing through the oil return duct.
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).
Abstract:
The invention relates to a scroll refrigeration compressor including: a stationary volute (8) and a moving volute (11) each comprising a plate (9, 12) provided with a scroll (10, 13), said scrolls defining variable-volume compression chambers (14); a delivery line (15) provided in the plate (9) of the stationary volute (8); a delivery port (27) arranged such as to establish a communication between the delivery line (15) and a delivery chamber (16); and a non-return device comprising (i) a valve seat (18) surrounding the delivery port (27) and (ii) a delivery valve (29) which can move between delivery port (27) opening and closing positions. The compressor comprises: at least one bypass passage (32) having a first end opening into the delivery line (15) at a point between the central compression chamber (14a) and the valve seat (28) and a second end opening into an intermediate compression chamber (14b), and at least one bypass valve (39) which can move between bypass passage (32) closing and opening positions.
Abstract:
The invention relates to a scroll refrigeration compressor including: a sealed casing; stationary (7) and moving (10) volutes comprising scrolls inserted into one another and defining variable-volume compression chambers (13); a delivery chamber (24) defined by the plate (8) of the stationary volute (7) and the sealed casing; a heat shield (32) disposed in the delivery chamber, dividing the chamber into (i) a first volume (33a) defined by the plate of the stationary volute and the heat shield and (ii) a second volume (33b) defined by the heat shield and the sealed casing; and at least one bypass passage (34) arranged to communicate the first and second volumes. The compressor also includes: at least one bypass passage (35) arranged to communicate the first volume (33a) with an intermediate compression chamber (13b), and at least one bypass valve (36) which is disposed in the first volume and which can move between positions for sealing and opening a corresponding bypass passage (35).
Abstract:
This refrigeration system (1) comprises a circuit (2) through which there circulates a refrigerant fluid notably comprising a compression device (6) comprising first and second compressors (7, 8), each compressor comprising a body (9) comprising, on the one hand, a low-pressure part (11) containing a motor (12) and an oil pan (13) and, on the other hand, a refrigerant fluid intake orifice (15) opening into the low-pressure part, first and second branch pipes (21, 22) placing a refrigerant fluid distribution pipe respectively in communication with the intake orifices (15) of the compressors (7, 8), an oil level equalizing pipe (23) placing the oil pans (13) of the compressors in communication with each other, and a pressure equalizing pipe (24) placing the low-pressure parts (11) of the compressors in communication with each other. The first branch pipe comprises means for reducing the bore section for the flow of the refrigerant gas along said branch pipe.
Abstract:
Ce compresseur comprend une volute fixe (6) et une volute mobile (9) comportant chacune un plateau (7, 11) équipé d'une spirale (8, 12), les spirales délimitant des chambres de compression (13) de volume variable, une plaque de séparation (16) montée de manière étanche sur le plateau (7) de la volute fixe (6) de façon à autoriser un mouvement relatif entre la plaque de séparation et la volute fixe, une chambre de refoulement (21) délimitée par la plaq ue de séparation et l'enveloppe étanche. Le compresseur comprend également un passage de dérivation (32) agencé pour mettre en communication la chambre de refoulement (21) avec une chambre de compression intermédiaire (13b), et un dispositif antiretour (34) comprenant un organe d'obturation mobile entre des positions d'obturation et de libération du passage de dérivation, et un boîtier (35), disposé entre la plaque de séparation (16) et le plateau (7) de la volute fixe, comportant une première portion montée de man ière étanche dans un logement (44) délimité par la plaque de séparation (16) et orienté parallèlement à l 'axe longitudinal (A) du compresseur.