Abstract: A machine having two volute casings describing an orbital relative movement, one of the volute casings being fitted with at least one scroll and the other volute casing being equipped with at least two scrolls, the various scrolls delimiting a first series of variable-volume chambers belonging to a first compression or expansion stage, and a second series of variable-volume chambers belonging to a second compression or expansion stage, each stage having a high-pressure fluid passage and low-pressure fluid passage. A portion of the low-pressure fluid passage of the second stage is designed to open into one of the chambers of the second stage and is further away from the zone of convergence of the scrolls delimiting the variable-volume chambers of the second stage than a portion of the high-pressure fluid passage of the first stage that is designed to open into one of the chambers of the first stage.

Abstract: A sealed compressor is provided with a spray lubricant that will provide lubricant at various bearing surfaces during initial start-up of the compressor. The lubricant will wear away quickly after initial run-in, but liquid lubricant will be provided by that time.

Abstract: This compressor comprises first and second volutes describing an orbital relative movement and each comprising a plate from which a spiral extends, the two spirals being engaged one inside the other and defining pairs of compression chambers of variable volume. The compressor has a housing formed in that surface of the plate of the first volute which is turned towards the spirals, which opens into one of the compression chambers, refrigerant delivery means leading into the housing, and a nonreturn device being mounted in the housing, the nonreturn device preventing communication between the delivery means and the compression chamber into which the housing opens in a first or closed position, and allowing communication between the delivery means and said compression chamber in a second or open position.

Abstract: A sealed compressor is provided with a spray lubricant that will provide lubricant at various bearing surfaces during initial start-up of the compressor. The lubricant will wear away quickly after initial run-in, but liquid lubricant will be provided by that time.

Abstract: Compressor has a fixed scroll and a scroll movable in an orbit relative to the fixed scroll. The fixed and movable scrolls are equipped with a spiral wrap that engage each other and delimit variable-volume compression chambers. The spiral wrap of the movable scroll has a stepped portion extending over at least a portion of its length. At least one of the scrolls defines a passage for communication, during orbital movement of the movable scroll, between two compression chambers, with the ends of the passage terminating respectively on either side of the outer and inner walls of the spiral wrap of the scroll with the passage or inside the outer and inner walls of the spiral wrap of the scroll with the passage. The passage has a check valve for allowing fluid to flow only from the outer wall of the spiral wrap of the scroll with the passage to the inner wall.

Abstract: This refrigerating compressor comprises a sealed chamber delimiting a suction volume and a compression volume arranged respectively either side of a body contained in the chamber, and an oil injection circuit arranged to inject oil into the compression volume. The oil injection circuit comprises a moving blocking piece, operated by a centrifugal force, between a first position enabling oil injection into the compression volume and a second position preventing or limiting oil injection into the compression volume, the blocking piece being arranged to be displaced into its second position when the speed of the compressor exceeds a predetermined value.

Abstract: A cylinder head for a piston refrigeration compressor that includes at least a first part defining a cooling-gas suction chamber and at least a second part defining a cooling-gas discharge chamber, the first and second parts being distinct from each other, and the suction and discharge chambers each being intended to be brought into communication with a compression chamber provided in the compressor. The cylinder head includes thermal insulation means provided between the first and second parts, the thermal insulation means including an insulation chamber defined by the first and second parts.

Abstract: A discharge check valve assembly for use with a hermetic scroll compressor having a compressor shell is provided. The discharge check valve assembly includes a valve housing and a valve seat located within the valve housing. The valve housing is configured to mount the discharge check valve assembly to the compressor shell. The discharge check valve assembly also includes a discharge fitting and a valve subassembly. The discharge fitting is configured to mount to the compressor shell and configured to connect to a connecting tube in fluid communication with a high-pressure system. The valve subassembly has a valve member movable between an open position and a closed position. Additionally, the valve subassembly is configured to be inserted through the discharge fitting into the valve housing.

Abstract: A scroll-type refrigerant compressor with a sealed enclosure defined by a shell and containing a suction volume and a compression volume at opposite ends of the enclosure. The shell has a gas inlet, an electric motor on the suction side having a stator and defining with the shell an annular volume. The stator is surrounded by a jacket defining an annular volume with the shell and a chamber which contains the motor winding and is directed towards the compression volume, an end of the intermediate jacket directed away from the compression volume being located at an end of the stator directed away from the compression volume. Structure is provided for conveying some of the gas arriving at the gas inlet into the chamber containing the motor winding, and gas conveyed by the structure is admitted into the chamber containing the winding through the gas intake orifice.

Abstract: A compressor comprising a sealed chamber delimited laterally by a shell, a drive shaft housed in the shell and guided relative to the other parts of the compressor via at least one bearing provided in a bearing support fixed to the internal wall of the shell. The method comprises steps consisting in supplying a shell have, in the fixing plane of the bearing support, an oval section comprising a small axis to which the bearing support is intended to be mounted, exerting a pressure on the shell in order to elastically deform it so as to increase the length of its small axis, inserting and positioning the bearing support in the fixing plane of the latter, and ceasing to exert a pressure on the shell so that the latter tends to elastically return to its original form and grip the bearing support.

Abstract: A scroll-type refrigerant compressor includes a drive shaft with an off-axis lubrication conduit which is supplied with oil from an oil pan located in the lower part of the compressor by an oil pump that is disposed at a first end of the shaft. The lubrication conduit has lubrication holes at the different shaft guide bearings. The second end of the shaft is equipped with a device that enables the orbital movement of the moving scroll of the compressor. The aforementioned shaft also includes a return conduit which is inclined in relation to the axis of the shaft and which extends over at least part of the length thereof. One of the ends of the return conduit opens at the wall of the shaft in the area located beyond the rotor on the side of the oil pan. In addition, fluid communication is provided between the lubrication conduit and the return conduit.

Abstract: The invention concerns an element comprising an annular body (9) provided with two series of pins (10, 12) projecting from at least one side of the body (9), the pins (10) of a first series being engaged in grooves (7) of the fixed volute (3) and the pins (12) of a second series being engaged in grooves (8) of the mobile volute (4), to provide an orbital movement of the mobile volute (4) relative to the fixed volute (3), the contact surfaces of the pins (10, 12) of a common series with the walls of the grooves of the corresponding volute being parallel and the contact surfaces of the pins (10, 12) belonging to two series of pins being perpendicular. The annular body (9) is made of a first metal with a specific density and the pins are made of a second metal having a lower density than that of the first metal.

Abstract: A positioning and retaining element has a cylindrical rotary belt of substantially constant thickness, having an inner diameter substantially equal to the outer diameter of the stator to be capable of being mounted substantially coaxial clamped about the stator. The positioning and retaining element also has a number of support members projecting radially from the belt outwards and having each a support surface on the housing of the compressor, the support surfaces being located on the lateral surface of a fictitious rotary cylinder of same axis as the other belt and of diameter substantially equal to the inner diameter of the housing, such that the positioning and retaining element can be mounted clamped inside the housing.

Abstract: Compressor has a fixed scroll and a scroll movable in an orbit relative to the fixed scroll. The fixed and movable scrolls are equipped with a spiral wrap that engage each other and delimit variable-volume compression chambers. The spiral wrap of the movable scroll has a stepped portion extending over at least a portion of its length. At least one of the scrolls defines a passage for communication, during orbital movement of the movable scroll, between two compression chambers, with the ends of the passage terminating respectively on either side of the outer and inner walls of the spiral wrap of the scroll with the passage or inside the outer and inner walls of the spiral wrap of the scroll with the passage. The passage has a check valve for allowing fluid to flow only from the outer wall of the spiral wrap of the scroll with the passage to the inner wall.

Abstract: A sealed compressor is provided with a spray lubricant that will provide lubricant at various bearing surfaces during initial start-up of the compressor. The lubricant will wear away quickly after initial run-in, but liquid lubricant will be provided by that time.

Abstract: The invention concerns an element comprising an annular body (9) provided with two series of pins (10, 12) projecting from at least one side of the body (9), the pins (10) of a first series being engaged in grooves (7) of the fixed volute (3) and the pins (12) of a second series being engaged in grooves (8) of the mobile volute (4), to provide an orbital movement of the mobile volute (4) relative to the fixed volute (3), the contact surfaces of the pins (10, 12) of a common series with the walls of the grooves of the corresponding volute being parallel and the contact surfaces of the pins (10, 12) belonging to two series of pins being perpendicular. The annular body (9) is made of a first metal with a specific density and the pins are made of a second metal having a lower density than that of the first metal.

Abstract: This refrigerating compressor comprises a sealed chamber delimiting a suction volume and a compression volume arranged respectively either side of a body contained in the chamber, and an oil injection circuit arranged to inject oil into the compression volume. The oil injection circuit comprises a moving blocking piece, operated by a centrifugal force, between a first position enabling oil injection into the compression volume and a second position preventing or limiting oil injection into the compression volume, the blocking piece being arranged to be displaced into its second position when the speed of the compressor exceeds a predetermined value.

Abstract: A scroll-type refrigerant compressor includes a drive shaft with an off-axis lubrication conduit which is supplied with oil from an oil pan located in the lower part of the compressor by an oil pump that is disposed at a first end of the shaft. The lubrication conduit has lubrication holes at the different shaft guide bearings. The second end of the shaft is equipped with a device that enables the orbital movement of the moving scroll of the compressor. The aforementioned shaft also includes a return conduit which is inclined in relation to the axis of the shaft and which extends over at least part of the length thereof. One of the ends of the return conduit opens at the wall of the shaft in the area located beyond the rotor on the side of the oil pan. In addition, fluid communication is provided between the lubrication conduit and the return conduit.

Abstract: The invention relates to a scroll-type refrigerant compressor The inventive compressor comprises: a sealed chamber which is defined by a ferrule (2) and which contains a suction volume and a compression volume; and an electric motor which is disposed on the suction side and which comprises a stator (7) and a rotor (8), the latter being solidly connected to a drive shaft (26). The stator (7) is surrounded by an intermediate casing (6) which defines (i) an annular volume (13) with the moving ferrule (2) of the compressor and (ii) a chamber (11) containing the coil end of the motor and facing the compression volume side. The end of the intermediate casing that faces the side opposite the compression volume is disposed at the end of the stator facing the side opposite the compression volume or set back from same. In addition, means (14) are provided in order to convey at least part of the gas arriving at the gas inlet in the ferrule into the chamber (11) containing the coil end.

Abstract: A device for guiding a movable scroll of a scroll compressor. The device includes a track that guides the movable scroll and supports the radial inertial forces to prevent excessive and potentially harmful contact forces between the fixed scroll and the movable scroll. Hence, the radial inertial forces are supported by the guide track so that the scrolls are not overloaded and there is no risk that the crankshaft will bend.