A compressor is disclosed, which comprises a case, a cylinder disposed inside the case, a piston moving inside the cylinder, and a muffler provided in the piston. The muffler includes a fluid pipe provided with a resonant space formed between an outer circumferential surface and an inner circumferential surface of the piston, and a guide panel protruded from the outer circumferential surface of the fluid pipe to the inner circumferential surface of the piston and extended along an outer circumferential direction of the fluid pipe. The guide panel is provided in a plural number, and is partially opened along the outer circumferential direction of the fluid pipe to form an open area, and the open area formed in any one guide panel is covered by its adjacent guide panel.

A linear compressor may include a shell, a shell cover, a compressor body disposed in the shell, and a support device configured to connect the compressor body to the shell cover to prevent the compressor body from contacting an inner peripheral surface of the shell. The support device includes a support spring formed with a hole in a central portion and having a spiral spring arm extending from the central portion to an outer portion, at least a portion of the outer portion being connected to the compressor body, a rigid connection portion spaced apart from the support spring by a predetermined distance, and an elastic connection portion formed to surround at least a portion of a periphery of the hole of the support spring to connect the support spring and the rigid connection portion and coupled to the shell cover.

A linear compressor includes a cylinder, a frame, and a discharge unit. The discharge unit includes a discharge cover coupled with the frame, a discharge plenum disposed inside the discharge cover to define a plurality of discharge spaces, and an insulating plenum provided in a shape corresponding to an inner surface of the discharge cover to contact the inner surface of the discharge cover.

A noise mitigation boot that can be installed on or integrated into a miniature diaphragm pump to reduce the overall noise and improve sound quality during operation. The diaphragm pump includes a housing having first and second ports and an interior chamber, a pumping diaphragm disposed in the interior chamber and dividing the interior chamber into a pumping chamber and a backside chamber, a motor for reciprocating the pumping diaphragm for pumping air into and out of the pumping chamber, and flow passages connecting the pumping chamber to the first and second ports. The first port is configured for attachment to a flow line and the second port opens to an exterior surface of the housing. The noise mitigation boot has a muffler wall overlying the exterior surface of the housing. The muffler wall has formed therein a passage extending from the second port to the backside chamber for effecting fluid communication between the second port and the backside chamber.

A suction damping device for a variable displacement compressor includes a rotor rotatably received within a stator disposed in a suction port of the variable displacement compressor. The rotor includes an aperture and the stator includes a pair of opposing openings in selective fluid communication with the aperture of the rotor. An electromagnetic device controls a rotational position of the rotor relative to the stator based on a condition of an electrically controlled valve used to control an angle of inclination of a swashplate of the variable displacement compressor. A changing of the rotational position of the rotor relative to the stator causes a variable overlap to be formed between the aperture of the rotor and the openings of the stator to control a flow of a refrigerant through the suction damping device.

The packaged compressor includes inside a package: a compressor main body compressing air; a cooling fan; a fan cover attached to the cooling fan and opened to a suction side and to an upward direction being a delivery side of the cooling fan; an exhaust duct provided above a delivery side opening of the fan cover and extending in a vertical direction; and an air-cooled heat exchanger arranged to be inclined with respect to a vertical direction inside the exhaust duct and configured to exchange heat between air compressed by the compressor main body and air delivered by the cooling fan.

A suction damping device for a variable displacement compressor includes a rotor rotatably received within a stator disposed in a suction port of the variable displacement compressor. The rotor includes an aperture and the stator includes a pair of opposing openings in selective fluid communication with the aperture of the rotor. An electromagnetic device controls a rotational position of the rotor relative to the stator based on a condition of an electrically controlled valve used to control an angle of inclination of a swashplate of the variable displacement compressor. A changing of the rotational position of the rotor relative to the stator causes a variable overlap to be formed between the aperture of the rotor and the openings of the stator to control a flow of a refrigerant through the suction damping device.

A reduced-noise pneumatic motor has a housing with a cap disposed at a first end, the cap having an air inlet; a base disposed at a second end, the base having an air outlet hole formed therein and configured to at least partially receive a noise damping system, and a piston pump extending therethrough; and bolts extending from the cap to the base to secure the cap and the base to the housing. A pneumatic piston is disposed within the housing, and includes a shuttle valve situated within a central bore of the pneumatic piston. A piston rod has a first end extending into the piston pump and a second end secured to a spring which biases the piston rod against the pneumatic piston.

A rotary compressor includes a casing, a compression mechanism housed in the casing and having a suction port, a joint pipe fixed to the casing and formed into a cylindrical shape, a suction pipe arranged inside the joint pipe and communicating with the suction port, and an accumulator including an outlet pipe connected to an inlet end of the suction pipe. A large diameter portion formed on an inlet side of the suction pipe is fixed to an inner peripheral surface of the joint pipe, and a small diameter portion formed on an outlet side of the suction pipe has a smaller outside diameter than the large diameter portion. The joint pipe is made of an iron-based material. A clearance is formed between an outer peripheral surface of the small diameter portion of the suction pipe and the inner peripheral surface of the joint pipe.

A reduced-noise pneumatic motor has a housing with a cap disposed at a first end, the cap having an air inlet; a base disposed at a second end, the base having an air outlet hole formed therein and configured to at least partially receive a noise damping system, and a piston pump extending therethrough; and bolts extending from the cap to the base to secure the cap and the base to the housing. A pneumatic piston is disposed within the housing, and includes a shuttle valve situated within a central bore of the pneumatic piston. A piston rod has a first end extending into the piston pump and a second end secured to a spring which biases the piston rod against the pneumatic piston.