A linear compressor or sealed system may include a casing, a piston, an driving coil, an inner back iron assembly, and a planar spring assembly. The casing may include a cylinder assembly defining a chamber along an axial direction. The piston may be slidably received within the chamber of the cylinder assembly. The inner back iron assembly may be positioned in the driving coil. The planar spring assembly may be mounted to the inner back iron assembly. The planar spring assembly may include a first planar spring, a second planar spring axially spaced apart from the first planar spring, and a polymer shim layer disposed between at least a portion of the first planar spring and the second planar spring.

The present disclosure provides a vacuum pumping device and a food processor. The vacuum pumping device includes an upper cover; a lower cover configured to cooperated with the upper cover to form a receiving cavity and including a connecting part at a lower portion of the lower cover, a wall of the receiving cavity defining an evacuation hole and an exhaust hole; a mounting support located in the receiving cavity and connected to the upper cover and/or the lower cover; a vacuum pump connected to the mounting support, and including an air inlet communicating with the evacuation hole and an air outlet communicating with the exhaust hole; a control circuit board connected to the mounting support and electrically connected to the vacuum pump; and a power supply device located in the receiving cavity and electrically connected to the control circuit board.

An air compressor more reliably protects a battery pack without lowering its operability for attachment to and detachment from a battery mount. The air compressor includes an electric motor driven on power from a battery pack having six faces, an operation unit operable to connect or disconnect power to the electric motor, an compression unit driven by the electric motor to produce compressed air, a tank that stores the compressed air, a battery mount that receives an attachment face of the battery pack, and a guard defining a protective area to contain the battery pack and the compression unit. The battery pack is attachable to the battery mount with at least three of the six faces exposed.

An air compressor more reliably protects a battery pack without lowering its operability for attachment to and detachment from a battery mount. The air compressor includes an electric motor driven on power from a battery pack having six faces, an operation unit operable to connect or disconnect power to the electric motor, an compression unit driven by the electric motor to produce compressed air, a tank that stores the compressed air, a battery mount that receives an attachment face of the battery pack, and a guard defining a protective area to contain the battery pack and the compression unit. The battery pack is attachable to the battery mount with at least three of the six faces exposed.

The negative pressure generator includes a chamber body with a suction nozzle; a piston, arranged inside the chamber body; and a driving device configured to drive the piston to reciprocated move inside the chamber body so as to generate negative pressure at the suction nozzle.

A cylinder block for a compressor includes: a shaft support configured to support a rotary shaft of an outer rotor type motor; a first support that is arranged radially outward of the shaft support and that extends along a circumferential direction about a center of the shaft support; a second support that is arranged radially outward of the first support and that extends along the circumferential direction about the center of the shaft support; a third support that connects the first support to the second support; a cylinder portion that defines a cylindrical inner space at a position radially away from the center of the shaft support; and a noise chamber defined at at least one side of the cylinder portion.

The present disclosure provides an electric compressor comprising a main housing, a motor part disposed in the main housing and comprising a stator comprising a rotor accommodating portion and a rotor rotatably disposed in the rotor accommodating portion, a compression part rotatably connected to the motor part, and an inverter part electrically connected to the motor part. The motor part is disposed in a motor room formed inside the main housing, the stator comprises a plurality of insulating protrusions protruding from an outer circumferential surface of the stator, and the plurality of insulating protrusions is configured to be brought into contact with an inner circumferential surface of the motor room.

An electric motor having a permanent magnet and a compressor including an electric motor are provided. The electric motor may include a stator; and a rotor rotatably disposed and spaced a predetermined gap apart from the stator. The rotor may include a rotational shaft, a permanent magnet arranged concentrically to the rotational shaft, and a permanent magnet support that supports the permanent magnet. The permanent magnet may have a cylindrical shape and be magnetized to have polar anisotropy such that a magnetic field is formed on the magnet's surface facing the gap but is not formed on the magnet's surface opposite to the gap. The permanent magnet support may be configured to form no flux path in the permanent magnet and connect the rotational shaft to the permanent magnet. Thus, the rotor has a reduced weight with consequent suppression of vibration and noise.

A reciprocating compressor includes a piston slidably mounted within a compression chamber and defining a suction port for receiving a flow of gas. A flex mount is mechanically coupled to the piston and has an inner surface that defines a suction cavity. A suction muffler is positioned at least partially within the suction cavity and includes an inlet tube extending along the axial direction within the suction cavity and defining an inlet passageway configured to receive the flow of gas and a plurality of chamber plates that extend along the radial direction from an outer surface of the inlet tube, the plurality of chamber plates and the flex mount defining a plurality of resonance chambers to reduce compressor noise.

A compressor control apparatus and method differently compensate for a duty ratio of a control signal during a period in which the compressor performs a compression stroke and a period in which the compressor performs a suction stroke, respectively, to generate the control signal for controlling a compressor.