A sound-insulating refrigerator vacuum assembly, comprising a sealed box receiving a vacuum pump, the sealed box body comprises an upper sealing body and a lower sealing body, the upper sealing body and the lower sealing body can be snap-fitted to define a receiving cavity, and the vacuum pump is placed in the receiving cavity; the vacuum assembly further comprises an air pipe member, the air pipe member comprises an air inlet pipe, an air outlet pipe and a base plate that are integrally formed, and the air inlet pipe and the air outlet pipe are disposed through the base plate; a notch portion is provided in the sealed box, and an outer edge of the base plate matches the notch portion in shape; the vacuum pump is connected with a muffler.

An outdoor unit of an air-conditioning apparatus includes: a terminal unit that is provided on an outer peripheral surface of a compressor, and electrically connects components provided in the compressor and outside the compressor; a side soundproof cover that covers the outer peripheral surface of the compressor except for the terminal unit; and a terminal cover that covers the terminal unit exposed from the side soundproof cover to the outside of the side soundproof cover, and soundproofs the terminal unit. The terminal cover is attached to the side soundproof cover such that the state of the terminal cover can be changed between a state in which the terminal cover covers the terminal unit and a state in which the terminal cover does not cover the terminal unit.

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 soundproof cover of a compressor for an air conditioner includes a sound-insulating material body portion (11) that is a rubber or thermoplastic-elastomer molded product with sound-insulating properties having a shape corresponding to an outer shape of a compressor body portion including a compressor leg portion positioned on a lower end side, having a folded portion (12) extending along a height direction of the compressor body portion and covering the compressor body portion by being folded through the folded portion (12), a sound-insulating material head portion (21) that is a rubber or thermoplastic-elastomer molded product with sound-insulating properties having a shape corresponding to an outer shape of a compressor head portion positioned on an upper end side of the compressor body portion and a sound absorbing material provided at least inside the sound-insulating material body portion (11).

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.

Refrigerant compressor includes an electrical drive unit, a piston/cylinder unit which can be driven by the drive unit for the cyclical compression of refrigerant, and at least one sound-damping unit made of a thermoplastic, through which sound-damping unit refrigerant can flow and which sound-damping unit includes at least one damping chamber. The at least one sound-damping unit is connected to the piston/cylinder unit in order to enable an exchange of refrigerant between the sound-damping unit and piston/cylinder unit. The at least one sound-damping unit includes at least in sections a functional surface. The functional surface is embodied such that an emissivity of a section of the sound-damping unit includes the functional surface is less than 0.7. The at least one sound-damping unit or at least one of the sound-damping units is embodied as a discharge muffler arranged downstream of the piston/cylinder unit in the direction of flow.

A motor-driven compressor, a housing structure for a motor-driven compressor, and a method of installing a soundproof cover on a motor-driven compressor are provided. A soundproof cover includes layers that include a first layer and a second layer. The first layer is placed over a housing, and the second layer is placed over the first layer. Each of the layers includes a first segment and a second segment. A second selection layer is located inward of a first selection layer. A boundary in the second selection layer is located above the boundary of the first selection layer.

An air pump device includes an electric pump unit including a pump mechanism and a motor configured to drive the pump mechanism, a case housing the electric pump unit, and a vibration-proof member interposed between the electric pump unit and the case. The vibration-proof member is a plate-shaped member made of an elastic resin material and is wound around the electric pump unit to wrap the electric pump unit therein. A part of the vibration-proof member is sandwiched between the electric pump unit and one of facing surfaces that are inner surfaces of the case and face each other inside the case. Another part of the vibration-proof member is sandwiched between the electric pump unit and the other one of the facing surfaces.

A compressor includes a compression mechanism to compress gas and discharge compressed gas, an electric motor to drive the compression mechanism, a casing housing the compression mechanism and the electric motor, a suction pipe connected to a suction side of the compression mechanism via the casing, and a discharge pipe provided at the casing to open in a space in the casing. The space has a first space located below the motor, and a second space located above the motor. The compression mechanism is disposed in the first space. The compressor is provided with a partition plate disposed in the second space, and the having a gas passage hole. The partition plate further has an oil drain hole formed at a lower level than an open end of the gas passage hole, and located radially outside an outer peripheral surface of a rotor of the electric motor.

An outdoor unit for an air-conditioning apparatus, having a compressor, a top cover configured to cover an upper surface of the compressor, and a side cover configured to cover a side of the compressor and a side of the top cover, the side cover including a rectangular cutout portion formed in a part of an upper end of the side cover. The outdoor unit has a non-water-absorbent draining element disposed across from a central portion of the top cover to a bottom portion of the cutout portion, and tilts down from the central portion of the top cover toward the bottom portion of the cutout portion.