A multi-stage electric gas pump includes a driving mechanism and an eccentric shaft including a main body having a longitudinal axis, a first eccentric portion, and a second eccentric portion, wherein the first eccentric portion and the second eccentric portion are fixed on the main body. The eccentric shaft is driven by the driving mechanism to produce a first circular movement of the first eccentric portion around the longitudinal axis and a second circular movement of the second eccentric portion around the longitudinal axis, wherein the second circular movement is synchronized with the first circular movement. The multi-stage electric gas pump further includes a first cylinder, a second cylinder, and a third cylinder. The cylinders in three stages are driven by the eccentric shaft so as to achieve three-stage pressurization of gas.

An electrical multi-purpose apparatus includes a base frame unit, and an internal combustion engine, an electric generator, an output unit, an air compressor, and a jet cleaner that are disposed on the base frame unit. The internal combustion engine includes a combustion engine motor. The electric generator is driven operably by the internal combustion engine for generating electric power. The output unit, the air compressor, and the jet cleaner are electrically connected to the electric generator. The air compressor includes an air compressor motor. The jet leaner includes a jet cleaner motor. The combustion engine motor, the air compressor motor, and the jet cleaner motor have different motor speeds.

A mobile thick matter pump for conveying thick matter includes a trailer chassis, a pump unit, and a drive motor. The pump unit is arranged on the trailer chassis. The drive motor is arranged on the trailer chassis and configured to drive the pump unit to convey thick matter. The pump unit is arranged eccentrically on the trailer chassis such that the pump unit is laterally offset in a first direction relative to a longitudinal center plane of the trailer chassis. The drive motor is arranged eccentrically on the trailer chassis such that the drive motor is laterally offset relative to the longitudinal center plane in a second direction opposite to the first direction.

An air compressor includes: a motor actuating a mechanism to generate compressed air; a tank part in which the compressed air is stored; a pressure detector detecting a pressure value in the tank part; and a controller driving the motor when the pressure value is equal to or smaller than an ON pressure value and to stop drive of the motor when the pressure value is equal to or greater than an OFF pressure value. The controller executes processing for detecting a continuous drive time or a continuous stop time of the motor and changing at least one of the ON pressure value, the OFF pressure value and an output of the motor, and the controller detects a change amount of the pressure value, and to determine an execution cycle of the processing or a change amount of a value in the processing, based on the detected change amount.

An air compressor includes a compressor assembly with a motor and a pump driven by the motor, a battery receptacle, and a battery pack electrically connected to the motor via the battery receptacle for providing electrical power to the motor. The battery receptacle and the battery pack are positioned adjacent the compressor assembly. The compressor also includes a storage tank that receives compressed air from the pump, a case enshrouding the compressor assembly, an outlet port in fluid communication with the storage tank, and an adjustable pressure regulator at least partially positioned within the case. The outlet port configured to discharge compressed air from the storage tank at a regulated pressure determined by the pressure regulator. The compressor further includes an adjustment knob to adjust the regulated pressure of compressed air provided by the outlet port. The case attenuates noise emitted by the compressor assembly to less than 68 decibels.

An air compressor includes a compressor assembly with a motor and a pump driven by the motor, a battery receptacle, and a battery pack electrically connected to the motor via the battery receptacle for providing electrical power to the motor. The battery receptacle and the battery pack are positioned adjacent the compressor assembly. The compressor also includes a storage tank that receives compressed air from the pump, a case enshrouding the compressor assembly, an outlet port in fluid communication with the storage tank, and an adjustable pressure regulator at least partially positioned within the case. The outlet port configured to discharge compressed air from the storage tank at a regulated pressure determined by the pressure regulator. The compressor further includes an adjustment knob to adjust the regulated pressure of compressed air provided by the outlet port. The case attenuates noise emitted by the compressor assembly to less than 68 decibels.

Compressor control systems capable of increasing the reliability and uptime of air compressor systems that operate in harsh corrosive outdoor environments by redundantly sensing one or more operating parameters of the air compressor systems. Such a compressor control system includes a controller adapted to monitor at least a first operating parameter of a component of the air compressor system, at least first and second sensors that are physically separate and spaced apart from each other and that redundantly sense the first operating parameter of a component of the air compressor system, and separate and independent wiring harnesses electrically connecting the first and second sensors to the controller.

Compressor control systems capable of increasing the reliability and uptime of air compressor systems that operate in harsh corrosive outdoor environments by redundantly sensing one or more operating parameters of the air compressor systems. Such a compressor control system includes a controller adapted to monitor at least a first operating parameter of a component of the air compressor system, at least first and second sensors that are physically separate and spaced apart from each other and that redundantly sense the first operating parameter of a component of the air compressor system, and separate and independent wiring harnesses electrically connecting the first and second sensors to the controller.

A portable drill-driven compressor head. A compressor assembly is configured with a drill attachment which harnesses the rotation of a main shaft to pressurize air and deliver such pressurized air through a hose.

An air inflator device contains: an accommodation box and an air compressor. The accommodation box includes a cap and a case, and the air compressor and an air guiding mechanism are received in the cap and the case. The air guiding mechanism is configured to frame a cooling fan which is rotatably with a motor of the air compressor. A flowing orifice is defined by the first directing portion and the second directing portion, and a first semicircular cover and a second semicircular cover of the air guiding mechanism are configured to collect and guide airs so that the cooling fan rotates to guide the airs to the air compressor quickly, thus dissipating heat and prolonging a service life of the air compressor.