A rotor for a vane cell pumpin particular, for a vacuum pumpwith a base body that is made of plastic and can be driven by rotation, and that rotates about an axis of rotation during operation, wherein the base body comprises a guiding section for slidably receiving a pump vane and wherein the base body is flanked in the direction of the axis of rotation by a first bearing surface and a second bearing surface, wherein the second bearing surface comprises bearing sections that are at a distance from one another and that lie on a circular path that is arranged concentrically to the axis of rotation.

A vane pump includes a liner defining a cammed inner surface, a rotor rotatably disposed within the liner that has a plurality of vane slots, and a plurality of vanes slidably disposed within vane slots of the rotor and configured to extend away from the rotor and contact the cammed inner surface of the liner. The plurality of vanes include at least one sentinel vane that is configured to allow detection of wear on the sentinel vane.

A compressor may include a casing, and an electric drive that is disposed inside of the casing and rotate a rotational shaft. A compression portion may be disposed inside of the casing. The compression portion may include a cylinder, a main bearing, and a sub-bearing, which together define a compression space. The compressor may include at least one first oil drain portion recessed radially inward on one of an outer peripheral surface of the main bearing or the cylinder, which has a relatively smaller diameter. The compressor may further include at least one second oil drain portion formed by penetrating, in an axial direction, a remaining one of the main bearing or the cylinder, which has a relatively larger diameter.

A rotary compressor includes: a case; a cylinder inside the case and has an internal space, and which includes a rolling piston configured to eccentrically rotate in the internal space, a vane in contact with the rolling piston such that while the vane is in contact with the rolling piston, the internal space of the cylinder is divided into a suction chamber and a compression chamber, a suction port to allow refrigerant to flow to the suction chamber, and a discharge port to allow the refrigerant to be discharged the compression chamber; a drive device that includes a rotation shaft connected to the rolling piston and a motor configured to rotate the rotation shaft; and a valve member that is fixed to a side surface of the vane and selectively opens and closes the discharge port as the vane reciprocates back and forth.

A compressor includes a compression mechanism, an injection valve disposed in an injection passage, and an injection pipe to supply refrigerant to the injection passage. The injection valve includes a valve body movable along a first direction, a valve presser disposed closer to the injection pipe than the valve body to restrict movement of the valve body toward the injection pipe, and a valve seat disposed closer to a compression chamber than the valve body to restrict movement of the valve body toward the compression chamber. The valve presser has a first hole. The valve body has a second hole. A buffer space communicates with a first space that accommodates the valve body between the valve presser and the valve seat. An opening of the buffer space facing the valve body does not overlap an annular peripheral edge located around the second hole when viewed in the first direction.

The invention relates to a rotary vane pump (1) for conveying a fluid to be conveyed, with a housing (2), with a rotor receiving chamber (3) and a lubricant chamber (14). An eccentrically arranged rotor (4) is provided in a rotor receiving chamber (3) in such a way that at least one conveying chamber (11) is produced, the volume of which varies cyclically during rotation of the rotor (4). Furthermore, the rotary vane pump (1) has an intake channel (12) for feeding the fluid to be conveyed into the conveying chamber (11) and a discharge channel (13) for discharging the fluid to be conveyed out of the conveying chamber (11) in the direction of the lubricant chamber (14), wherein a valve device (21) is provided between the discharge channel (13) and the lubricant chamber (14) in order to prevent a backflow of fluid, in particular of lubricant and/or of fluid to be conveyed, from the lubricant chamber (14) into the conveying chamber (11). The rotary vane pump (1) is furthermore designed and set up in such a way that the discharge channel (13) is arranged in such a way that it opens into the lubricant chamber (14). Furthermore, the rotary vane pump (1) has at least one ventilation channel (26), which is fluidically connected by a conveying chamber end (28) to the conveying chamber (11) and fluidically connected by a ventilation end (27) to a chamber outside the conveying chamber (11), as well as at least one compensation channel (29), which is fluidically connected by a conveying chamber end (31) to the conveying chamber (11) and fluidically connected by a compensation end (30) to the lubricant chamber (14). In this way, the rotary vane pump (1) is designed and set up in such a way that the compensation end (30) opens into the lubricant chamber (14) below the lubricant level (24) in an operating state of the rotary vane pump (1) and opens into the lubricant chamber (14) above the lubricant level (34) in a resting state of the rotary vane pump (1).

A 2-cylinder rotary compressor includes a head to which an intake pipe is connected; a first cylinder in which a first piston rotates eccentrically inside; a second cylinder in which a second piston rotates eccentrically inside; a middle plate provided between the first cylinder and the second cylinder; a main flow path penetrating from the intake pipe through the head, the first cylinder, and the middle plate to the second cylinder; a first branch flow path branching from the main flow path into an interior of the first cylinder; and a second branch flow path branching from the main flow path into an interior of the second cylinder.

The invention relates to a rotary vane pump (1) for conveying a fluid to be conveyed, with a housing (2), with a rotor receiving chamber (3) and a lubricant chamber (14). An eccentrically arranged rotor (4) is provided in a rotor receiving chamber (3) in such a way that at least one conveying chamber (11) is produced, the volume of which varies cyclically during rotation of the rotor (4). Furthermore, the rotary vane pump (1) has an intake channel (12) for feeding the fluid to be conveyed into the conveying chamber (11) and a discharge channel (13) for discharging the fluid to be conveyed out of the conveying chamber (11) in the direction of the lubricant chamber (14), wherein a valve device (21) is provided between the discharge channel (13) and the lubricant chamber (14) in order to prevent a backflow of fluid, in particular of lubricant and/or of fluid to be conveyed, from the lubricant chamber (14) into the conveying chamber (11). The rotary vane pump (1) is furthermore designed and set up in such a way that the discharge channel (13) is arranged in such a way that it opens into the lubricant chamber (14). Furthermore, the rotary vane pump (1) has at least one ventilation channel (26), which is fluidically connected by a conveying chamber end (28) to the conveying chamber (11) and fluidically connected by a ventilation end (27) to a chamber outside the conveying chamber (11), as well as at least one compensation channel (29), which is fluidically connected by a conveying chamber end (31) to the conveying chamber (11) and fluidically connected by a compensation end (30) to the lubricant chamber (14). In this way, the rotary vane pump (1) is designed and set up in such a way that the compensation end (30) opens into the lubricant chamber (14) below the lubricant level (24) in an operating state of the rotary vane pump (1) and opens into the lubricant chamber (14) above the lubricant level (34) in a resting state of the rotary vane pump (1).