An air compressor includes a controller, a pump and an air storage tank. The pump is in communication with the air storage tank. A first air inlet and a first air outlet are provided on the pump. The pump is configured to pump an external air into the air storage tank. The controller is provided at the first air inlet of the pump, and is electrically connected with the pump. The controller is configured to control the operation of the pump. The external air is in contact with the controller, and enters the pump through the first air inlet and then flows out of the pump through the first air outlet, so as to realize a heat dissipation of the pump and the controller.

There is provided a compressor including: a piston that reciprocates inside a cylinder; a valve plate that closes an end portion of the cylinder; a connecting rod that supports the piston; a crankshaft that applies a rotating force to an end portion of the connecting rod; and a crankcase that rotatably supports the crankshaft. The piston is an oscillating piston that reciprocates while oscillating inside the cylinder according to rotation of the crankshaft. An outer peripheral surface of the piston is a curved surface.

An inflator with an air guiding sleeve includes a chassis, a core and a drive motor installed in the chassis, an air guiding sleeve and a cooling fan. The air guiding sleeve has an air guiding hole penetrating through the air guiding sleeve. The drive motor includes a main body and a shaft rotatably installed to the main body, and the shaft has an end protruded from the main body and provided for driving the core to move and the other end protruded from the main body and provided for connecting the cooling fan. The air guiding sleeve includes a positioning shell and an air guiding ring connected to the positioning shell, and the positioning shell is installed to the chassis and/or the drive motor, and the air guiding ring is sheathed onto the external side of the cooling fan and installed around the cooling fan.

An inflator with an air guiding sleeve includes a chassis, a core and a drive motor installed in the chassis, an air guiding sleeve and a cooling fan. The air guiding sleeve has an air guiding hole penetrating through the air guiding sleeve. The drive motor includes a main body and a shaft rotatably installed to the main body, and the shaft has an end protruded from the main body and provided for driving the core to move and the other end protruded from the main body and provided for connecting the cooling fan. The air guiding sleeve includes a positioning shell and an air guiding ring connected to the positioning shell, and the positioning shell is installed to the chassis and/or the drive motor, and the air guiding ring is sheathed onto the external side of the cooling fan and installed around the cooling fan.

Systems and apparatuses are described for portable air distribution. A portable air unit may be used operate and/or assist operation of components/systems and provide critical instrument air supply in a wide variety of emergency industrial and commercial environments. The portable air unit may provide, via one or more solenoids, air from a battery powered integrated air compressor, as well as critical control power, to one or more air operated valves (AOVs) or Instrument Air Control Systems. The portable air unit may be configured, via an inverter and/or battery, to provide Alternating Current (AC) and/or a Direct Current (DC) electricity, power, and/or the like that may be used for diagnostic testing and/or any other critical power needs.

A portable air compressor includes a frame, a compressor unit coupled to the frame, and an air tank for storing compressed air generated by the compressor unit. The air tank is coupled to the frame. A battery compartment coupled to the frame. The battery compartment defines an opening and a battery receptacle within the opening. The portable air compressor also includes a battery pack selectively electrically connectable to the battery receptacle, an outlet port protruding from the battery compartment, a tank gauge on the battery compartment, a pressure regulator between the air tank and the outlet port for regulating the pressure of air supplied from the outlet port, an actuator on the battery compartment for adjusting the regulated pressure of air supplied from the outlet port, and a switch on the battery compartment for turning the compressor unit on and off.

A portable air compressor includes a frame, a compressor unit coupled to the frame, and an air tank for storing compressed air generated by the compressor unit. The air tank is coupled to the frame. A battery compartment coupled to the frame. The battery compartment defines an opening and a battery receptacle within the opening. The portable air compressor also includes a battery pack selectively electrically connectable to the battery receptacle, an outlet port protruding from the battery compartment, a tank gauge on the battery compartment, a pressure regulator between the air tank and the outlet port for regulating the pressure of air supplied from the outlet port, an actuator on the battery compartment for adjusting the regulated pressure of air supplied from the outlet port, and a switch on the battery compartment for turning the compressor unit on and off.

Oil-injected multistage compressor device including a low-pressure compressor element (2) with a gas inlet (4a) for gas to be compressed and a gas outlet (5a) for low-pressure compressed gas and a high-pressure stage compressor element (3) with a gas inlet (4b) for low-pressure compressed gas and a gas outlet (5b) for high-pressure compressed gas. The gas outlet (5a) of element (2) is connected to inlet (4b) of element (3) via a conduit (6). The conduit (6) has a regulatable intercooler (9) configured to regulate the temperature at the gas inlet (4b) of the high-pressure stage compressor element (3) so that it is above the dew point. The intercooler (9) includes a regulatable air cooler and/or a regulatable water cooler, and is configured to adjust the temperature of the air or water by using a bypass conduit (16) and/or by screening off part of the intercooler (9).

Vacuum pump (18) for a medical aspirator (10), the pump (18) comprising a tubular member (20); a piston (22) slidably arranged within the tubular member (20); a piston rod (24) connected to the piston (22); and a coupling mechanism (36) for detachably and functionally connecting the piston rod (24) to a motor (38) for driving the pump (18), wherein the piston rod (24) is configured to reciprocate linearly during operation of the pump (18).

An oil lubricated compressor having a universal motor, efficient starting and re-starting characteristics, and a long operating life. The oil lubricated compressor can have a brushed or brushless universal motor which can drive a cooling fan and a pump. The universal motor can achieve a high torque to voltage ratio, as well as a high torque to current ratio, upon starting or re-starting of the compressor. Optionally, the oil lubricated compressor can use a single cooling fan disposed in the compressor at a location which is between the universal motor and a cylinder head of the pump.