A liquid leak detector for a pump is described. The liquid leak detector is mountable on a pump to detect leaked fluid coming from the pump. The leak detector includes a buffer tube positioned on the pump to collect a leaked fluid from the pump and a sensor positioned on the buffer tube to detect the level of leaked fluid in the buffer tube and to generate a signal when the leaked fluid reaches a maximum fluid level. A purge line on the buffer tube removes leaked drive fluid from the buffer tube once the leaked drive fluid reaches a maximum level. Logic connected to the sensor receives the signal from the detector and generates an alarm.

A paint sprayer includes an end bell, a motor connected to the end bell, a pump drive connected to the end bell, a pair of protrusions attached to an extending from the end bell such that each protrusion is cantilevered from the end bell, and a pump assembly comprising a pair of mounting holes and containing a piston. The pair of mounting holes is adapted to receive and slide onto the pair of protrusions to mount the pump assembly on the end bell as well as slide off of the pair of protrusions to remove the pump assembly from the end bell. The pump drive is configured to covert rotational motion output by the motor to reciprocal motion. The pump assembly is configured to pump paint when reciprocated by the pump drive while mounted on the end bell.

The pump has an electromagnet for reciprocating a piston, and a first casing member at least partially accommodating the piston and the electromagnet. The electromagnet has a stator core and coils wound around the stator core. The pump further includes a thermal protector disposed on the stator core. The thermal protector is held between the casing member and the stator core. When the thermal protector detects that the stator core has heated up above a predetermined temperature, the supply of electric power to the electromagnet is interrupted to stop the drive of the piston.

A vacuum pump includes a control unit that monitors and controls a motor and a magnetic bearing, each being stored in a pump body. A temperature-adjustment function unit measures a temperature of the pump body by at least one temperature sensor disposed in the pump body and controls at least one heater or solenoid controlled valve based on the temperature. The temperature-adjustment function unit includes a first terminal capable of connecting or disconnecting the temperature sensor and a second terminal capable of connecting or disconnecting one of the heater and the solenoid controlled valve. A self-diagnosis unit capable of conducting a self-diagnosis of whether an input signal to the first terminal has been normally inputted or whether the signal has been normally outputted from the second terminal.

An electric motor pump system includes a variable displacement pump, an electric motor connected to drive the variable displacement pump, a first control piston configured to limit an output pressure characteristic of the pump, and a second control piston controlled via a servo valve according to an output speed of the electric motor. In embodiments, the second piston is configured to maintain a substantially constant output flow of the pump as the output speed of the electric motor changes. With embodiments, the first and second control pistons may be configured to act on a yoke of the variable displacement pump.

An axial piston pump having several pistons has a magnetic encoder (5), which is arranged on a swash plate, and a magnetic field sensor, which is arranged in such a way that it faces towards the magnetic encoder (5). The magnetic encoder (5) has at least two permanent magnets (2, 3) and a plate (4) which consists of a ferromagnetic material. The permanent magnets (2, 3) are arranged on the plate (4) in such a way that they each faces a magnetic pole towards the plate (4), and this pole is at least partially covered by the plate (4) in each case.

A compressor maintenance monitoring and alert system for use with a compressor comprises a sensor unit including a housing, at least one vibration sensor and/or electrical impulse sensor, and a computer processor. The housing is constructed and arranged for being mounted or electrically coupled to the compressor. A processor of a mobile communication device receives compressor data transmitted by the sensor unit over a period of time, processes the received compressor data, determines if the received compressor data meets or exceeds scheduled maintenance tasks included in the look up tables, and displays required maintenance tasks on a display of the mobile communication device.

A compressor maintenance monitoring and alert system for use with a compressor comprises a sensor unit including a housing, at least one vibration sensor and/or electrical impulse sensor, and a computer processor. The housing is constructed and arranged for being mounted or electrically coupled to the compressor. A processor of a mobile communication device receives compressor data transmitted by the sensor unit over a period of time, processes the received compressor data, determines if the received compressor data meets or exceeds scheduled maintenance tasks included in the look up tables, and displays required maintenance tasks on a display of the mobile communication device.

There is provided an air pressure system for controlling an air compressor in real time in accordance with the actual usage of compressed air by a plurality of terminals. Furthermore, in case pressure losses change abruptly, unwanted electric power is prevented from being consumed by a stable operation free of response delays on the basis of a predicted model that assesses time lags of volume responses. There is provided an air pressure system for supplying compressed air discharged from an air compressor through an air tank and a piping system to a plurality of terminals that consume the compressed air, including a compressor pressure sensor for measuring the pressure of compressed air discharged from the air compressor, a plurality of terminal pressure sensors for measuring the pressures of compressed air supplied respectively to the terminals, a flow rate difference calculating device for calculating deviation information on the basis of a capacity of the air tank, information on the piping system, the pressure of compressed air discharged from the air compressor, and the pressures of compressed air supplied respectively to the terminals, and a control device for controlling operation of the air compressor on the basis of the deviation information.

There is provided an air pressure system for controlling an air compressor in real time in accordance with the actual usage of compressed air by a plurality of terminals. Furthermore, in case pressure losses change abruptly, unwanted electric power is prevented from being consumed by a stable operation free of response delays on the basis of a predicted model that assesses time lags of volume responses. There is provided an air pressure system for supplying compressed air discharged from an air compressor through an air tank and a piping system to a plurality of terminals that consume the compressed air, including a compressor pressure sensor for measuring the pressure of compressed air discharged from the air compressor, a plurality of terminal pressure sensors for measuring the pressures of compressed air supplied respectively to the terminals, a flow rate difference calculating device for calculating deviation information on the basis of a capacity of the air tank, information on the piping system, the pressure of compressed air discharged from the air compressor, and the pressures of compressed air supplied respectively to the terminals, and a control device for controlling operation of the air compressor on the basis of the deviation information.