Abstract: Apparatus, methods, and system for wireless remote monitoring and controlling a sucker rod pump for producing hydrocarbons, providing self-adjusting methods for operation over a wide-range of operating conditions according to algorithms that automatically compensate for offset and amplitude drift in sensor data, automatically identify pump off conditions, and automatically optimize hold down time.

Abstract: A pump unit for a pressure sewage system, including a pump for insertion in a sewage holding tank, the pump being capable of activation for pumping sewage out of the holding tank to an external pipeline, and a timer unit enabling activation of the pump for a first predetermined time period and preventing activation of the pump for a second predetermined time period directly following the first time period.

Abstract: A precharge circuit (20, 20?, 20?) charges at least one capacitor (22, 22?, 22?) associated with an electrical device with high capacitance, such as a motor (14) which drives a compressor (16) of the pneumatic system. One end of the at least one capacitor is connected with a high voltage bus (10). The other end of the at least one capacitor is connected by at least one charge limiting resistor (24, 24?, 24?) with a low reference node. When the at least one capacitor is charged at least to a preselected level, a control circuit (28, 28?, 28?) controls a switch (26, 26?, 26?) to bypass the current limiting resistor. In this manner, the current limiting resistors limit the surge current to charge the capacitors. Once the capacitors are charged, the resistors and their associated heat dissipation are removed from the circuit and only ripple current from across the capacitors flows through the switch reducing a required current carrying capacity and needed heat sinking for the switch.

Abstract: A method for controlling a constant-pressure fluid enables an inverter with a build-in controller to control rotation speed of a pump to achieve constant-pressure control thereof. In the control method, a pressure feedback value of output flow of the pump is measured and is compared with a pressure reference value to produce an error pressure value. Afterward, an operation condition of the pump, such as an abnormal handling condition, a deceleration standby handling condition, or an acceleration condition, is determined according to the pressure error value to shut down or re-start up the pump after a delay time. Hence, the control method can avoid frequently starting up or shutting down the inverter. Therefore, the power consumption and the operation cost are reduced. The use life of the pump prolongs and constant-pressure control for the pump can be implemented.

Abstract: A linear compressor control system includes an electronic circuit controlling an electric motor that drive a piston of the compressor, such that the motor is operated intermittently with an on-time (tL) and an off-time (tD) to keep the compression capacity of the compressor substantially constant. The compressor is associated with a closed cooling circuit having an evaporator and a condenser. The off-time (tD) is shorter than the time necessary for the evaporation pressure (PE) in the evaporator and the condensation pressure (Pc) in the condenser to equalize each other after the compressor has been turned off.

Abstract: A system and a method are provided for powering up a heating, ventilation, and air conditioning (HVAC) system and operating a sump heater for a compressor for a first predetermined period of time in response to the HVAC system being powered up. A heating, ventilation, and air conditioning system and a method for controlling the system are provided. The HVAC system includes a compressor, a sump heater associated with the compressor, and a controller configured to control the compressor and the sump heater so that the sump heater is not operated while the compressor is operated.

Abstract: A home appliance equipped with a drain function and a method of controlling the same are disclosed. A method of controlling a home appliance equipped with a drain apparatus includes switching ON/OFF the drain apparatus during a first time, switching on the drain apparatus during a second time after switching ON/OFF the drain apparatus, checking a variation of the water level according to a draining status, and controlling the drain apparatus based on the checked water-level variation result corresponding to the draining status.

Abstract: An air operated pump (10) uses a magnet (14) mounted in the valve cup (16) of the air motor (18) and two reed sensors (20) mounted in the valve cover (22) to monitor the speed and position of the valve (16). A solenoid (24) is mounted on the valve cover (22) and can be commanded to extend a plunger (26) into the valve cup (16) to stop valve movement and therefore the pump from running away. Three methods may be used to increase battery life and monitor the solenoid plunger position, two of which use the changing inductance of the solenoid (24) to monitor the solenoid movement.

Abstract: A pump system including a pump and a sensor system for monitoring a fluid production of the pump and providing an output indicative of the fluid production. The sensor system is configured to use at least two discreet methodologies for measuring the fluid production. The pump system further includes a control system operatively coupled to the sensor system and the pump and configured to automatically vary the speed of the pump at least partially based upon the output of the sensor system.

Abstract: An oscillating type piston is connected to an output shaft of an electric motor through a crankshaft. The piston is provided with a lip ring that slidingly contacts a cylinder. The motor is rotated forward and reversely by using a control circuit. Thus, different regions of the piston are subjected to a load during forward rotation of the motor and during reverse rotation thereof. Accordingly, wear of the lip ring can be distributed to different regions thereof.

Abstract: An electric pump with time setting and enhanced oil-pipe transfer capability, which comprising at least: an electric pump, a timer and an electromagnetic valve; the electric pump is used to supply lubricating oil for the engine operation, and a motor is equipped to provide boosting pressure and strong transfer power, thus preventing reduction of suction and oil feed of oil pipeline for the intake manifold of engine during urgent acceleration; the timer is electrically connected with the engine's starting switch and motor, helping to activate the energized engine after startup, and enable the startup and shut-off of timing control oil feed within a fixed time; the electromagnetic valve is electrically connected with the timer and also controlled by it for the opening and closing, so as to realize correct and accurate oil feed and braking.

Abstract: A compressor system operable to shutdown in response to a shutdown signal. The compressor system includes a compression device operable between a first speed and a second speed to produce a flow of compressed fluid at a pressure. A blowdown valve is movable between a closed position and an open position in which at least a portion of the flow of compressed fluid passes through the blowdown valve to reduce the pressure of the flow of compressed fluid. A sensor is positioned to measure the pressure and a controller is operable to move the blowdown valve to the open position and set the speed of the compression device to a low set point speed in response to the shutdown signal.

Abstract: A system includes a compressor, a control unite and a clutch assigned to the compressor. The control unit is suitable for opening and closing the clutch in order to economize energy. The control unit is suitable for carrying out a monitoring routine during which the clutch is opened or closed in order to prevent the clutch, the compressor and the components arranged downstream of the compressor from being damaged. A method for controlling the system, including the compressor, the control unit and the clutch associated with the compressor, is also provided.

Abstract: Embodiments of the invention provide a variable frequency drive system and a method of controlling a pump driven by a motor with the pump in fluid communication with a fluid system. The drive system and method can provide one or more of the following: a sleep mode, pipe break detection, a line fill mode, an automatic start mode, dry run protection, an electromagnetic interference filter compatible with a ground fault circuit interrupter, two-wire and three-wire and three-phase motor compatibility, a simple start-up process, automatic password protection, a pump out mode, digital input/output terminals, and removable input and output power terminal blocks.

Abstract: A method, system and device for making hot water available in a water-supply system is disclosed. The water-supply system includes a source of hot water, a hot-water line and one or more tap connections for hot water connected to the hot-water line. The method includes transporting water from the source of hot water through the hot-water line during at least a portion of periods of non-withdrawal through the one or more tap connections such that a temperature profile of water in the hot water line is at least one of substantially temporally constant and varying spatially monotonically along the hot-water line.

Abstract: A diffuser of natural aromas for refrigerated environments includes a dome designed to build up aromas, and houses a cartridge containing coffee as a natural base product, which is covered by a waterproofed mesh to protect the substance from moisture. The dome is coupled to a base that hosts an isolated battery compartment. Windows cut in the base are covered with a dehumidifying net allowing refrigerated and dried air to penetrate the base's inner surface. An electronic fan connected to the battery compartment is mounted on an overhang inside the base to convey air from the refrigerated environment through and outside the dome, creating an airflow cycle. A method of providing a way to neutralize unpleasant odors within refrigerated environments by diffusing natural aromas and a method of providing beneficial effects to a subject when natural aromas are inhaled may be implemented using the above described diffuser.

Abstract: A set of piston compressors (2, 4, 6, 8) for use in a refrigeration system comprises a fluid connection (10) between the crank cases of the piston compressors (2, 4, 6, 8) for allowing oil compensation between said piston compressors (2, 4, 6, 8); and a control unit (12) which in operation monitors the running time of each piston compressor (2, 4, 6, 8) and, in case all piston compressors (2, 4, 6, 8) are running, subsequently interrupts the operation of a respective piston compressor (2, 4, 6, 8) for a predetermined period of time for oil compensation if its running time reaches a predetermined maximum running time.

Abstract: A method of controlling a motor operating a pumping apparatus of a system includes determining a trip value for a parameter, floating the trip value, and monitoring the operation of the pump. Monitoring the operation of the pump includes determining a value for the parameter, comparing the value to the trip value, and determining whether the comparison indicates a condition of the pump. The method of controlling the motor also includes controlling the motor to operate the pump based on the condition of the pump.

Abstract: The present invention relates to an evacuation apparatus for evacuating a vacuum chamber of a substrate processing apparatus for processing a substrate such as a semiconductor wafer or liquid crystal panel. An evacuation apparatus according to the present invention includes a first vacuum pump connected to a vacuum chamber, and a second vacuum pump connected to the first vacuum pump. The first vacuum pump has a pair of multistage pump rotors.

Abstract: The present creation includes at least a control circuit for performing the start, stop or test run modes of a motor, and a detection loop composed of two detection circuits, the two detection circuits connecting the control circuit to the motor and the guide of a waterproof case respectively. When there is no water or the water is pumped off, the pumping device remains in the stopped state due to disconnection of the detection loop. As the water level reaches the guide and enables conduction in the detection loop, the circuits of the motor would be actuated and work in accordance with the modes set by the control circuit.

Abstract: In an engine drive washing machine, a discharge switch 10 is provided in a jet gun 5. When the switch 10 is turned off, an engine 1 is stopped. When the switch 10 is turned on, the engine 1 is started up to drive a pump 2. When an outlet pressure of the pump 2 is not lower than a predetermined value, a water-discharge valve in the gun 5 is opened to cause the water to be discharged. When the switch 10 is not turned off for a long time, the engine 1 is stopped. When an operator takes up the gun 5 to start the operation, the engine 1 is started up. The engine-drive type of washing machine is provided with a battery 13 for a starter motor, and the battery 13 is charged by a generator function of a starter-motor generator 3 during the operation of the engine 1.

Abstract: A device executing a start-up control method for an electric scroll compressor has a thermistor (18) and a pressure sensor (20) which, prior to the start-up of the scroll compression unit, detect temperature and pressure of a suction refrigerant introduced into the compression unit (2), and a controller (10) for controlling driving of a motor (4) of the compression unit (2) at the start-up of the compressor. The controller (10) determines at the start-up of the compressor whether or not a liquid refrigerant exists in the compression unit (2) on the basis of the detected temperature and pressure; selects either a normal start-up mode or a liquid-discharge mode in which the rotational speed of the motor (4) is regulated to be lower than in the normal start-up mode, according to the determination result; and controls the start-up of the compression unit (2) through the motor (4) according to the selected mode.

Abstract: A gravity-driven pumping unit has an inlet valve connected to a condenser, an outlet valve connected to a boiler, and a staging zone between the inlet and outlet valves. The inlet valve, the outlet valve, the liquid line and entire path established between the condenser and boiler are oriented, sized and shaped to allow for the vapor refrigerant to freely move upward from the boiler to the condenser and to allow for the liquid refrigerant to freely drain downwards from the condenser to the boiler by gravity. A control system opens and closes the inlet and outlet valves in a proper sequence, which enables gravity-driven movement of liquid refrigerant from the condenser to the staging zone and then from the staging zone to the boiler, against a positive pressure differential between the boiler and condenser.

Abstract: A method of flushing a wet well operating under a constant level pumping regime in a sewage system in which the wet well level is monitored and controlled along with the pump operation in response to a predicted period of reduced inflow. The method operates such that in advance of the predicted period of reduced inflow, the wet well level is allowed to rise to a flush level and during the predicted period of reduced inflow, the wet well level is reduced from the flush level to a normal level. Independent claims are included to a control unit, a pumping station and a sewage system, which are respectively operable under the claimed method.

Abstract: In a method of operating a compressor at startup, the compressor is rotated in reverse for a brief period of time. The compressor is of a type that does not compress liquid when rotated in reverse. The purpose is to boil off the liquid refrigerant from the oil by heating and agitating the mixture of oil and refrigerant in the oil sump. This results in a much more benign forward start as less refrigerant is drawn into the compressor pump and the amount of oil pumped out of the compressor on start up is minimized. Also, the viscosity of oil is increased and lubrication of the bearings is improved. After a short period of time reverse rotation is stopped and the compressor can start rotating in the forward direction. The short period of time of reverse rotation is varied based upon system conditions. In one embodiment, the variation can occur by reducing the reverse run time as ambient temperature increases.

Abstract: A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when system parameters are exceeded and/or fault conditions occur, can detect fault conditions, and can store fault conditions for later retrieval.

Abstract: When an oil-flooded screw compressor is started up in a cold environment after a long halt, start-up torque increases due to the increased viscosity of the oil that has long stayed inside the working chambers of the compressor. This has necessitated drive means with a larger capacity than that required for normal operation. An oil-flooded screw compressor according to the invention comprises: a casing; a pair of rotors each having screw-thread-shaped groove and being housed in the casing; an electric motor for rotationally driving the pair of rotors; a control device for controlling the electric motor; an oil feeding mechanism for feeding oil into working chambers formed by being enclosed by the casing and the pair of rotors in which teeth thereof are meshed to each other; and an oil separating mechanism for separating the oil from compressed gas discharged from the working chambers.

Abstract: For a motor that drives a compressed air generator, three operating modes which includes a powerful mode for rotating a motor in a high speed range, a silent mode for rotating the motor in a low speed range, and an automatic mode for automatically changing the rotation speed of the motor from the low speed to the high speed in accordance with a setup condition are prepared. A user can designate a desired operating mode by using an operating mode selection switch.

Abstract: Apparatus, methods, and system for wireless remote monitoring and controlling a sucker rod pump for producing hydrocarbons, providing self-adjusting methods for operation over a wide-range of operating conditions according to algorithms that automatically compensate for offset and amplitude drift in sensor data, automatically identify pump off conditions, and automatically optimize hold down time.

Abstract: A device and a method for controlling a two-cylinder thick matter pump comprising pistons that are actuated in a push-pull manner by means of a hydraulic reversible pump (6) and hydraulic drive cylinders controlled by said pump. To ensure a reliable operation of the pump the expected length of the stroke of the pistons (8, 8?) in the drive cylinders (5, 5?) is measured and recorded, the stroke time of each conveyance stroke is monitored and compared with the expected stroke duration, and the reversible pump (6) is respectively pivoted, reversing the flow, and/or the pipe switch (56) is reversed when the stroke time exceeds the expected stroke duration by a pre-determined value.

Abstract: A hot water system includes cold water pipes, hot water pipes, a water heater, a pump, a pump control unit and a connection valve unit. The pump is used to increase the pressure of the hot water pipes to a preset higher level than the pressure in the cold water pipes. When hot water is needed, the connection valve unit at the user side is opened to connect the cold water pipes and the hot water pipes, and when the cold water pipes and the hot water pipes are connected, the water pressure difference between them will become smaller. When the pressure difference change is detected, the pump control unit will activate the pump to pump the water in the hot water pipes into the cold water pipes, so the water in the pipes starts to circulate, and the water will flow through the water heater and will be heated. When the heated hot water reaches the user, the pump is stopped. After the hot water is being served or when the water temperature drops down, the pump is again put into normal operation.

Abstract: A pump driving apparatus has a characteristic changing section which receives a set pressure, a set flowing amount, a set horse power, and a DC voltage of the converter section as input, outputs modified values of pressure, flowing amount, and horse power, and supplies the modified values to the horse power command generation section. Therefore, the motor can be driven to suit the change in power voltage so that the motor capacity can be utilized sufficiently.

Abstract: A pump control valve for use between a motor driven pump and a fluid storage and supply tank. The pump control valve is operative to control the run time of the pump by controlling the fluid supplied to the tank between a maximum of fluid supplied to a minimum of fluid supplied during the time period in which the tank pressure is brought to the desired limit.

Abstract: To provide an operation control device for a vacuum pump and a method for stopping the operation of the vacuum pump that make it possible to effectively remove products, resulting from solidification and liquefaction of gas in a casing and possibly hindering the rotation of a pump rotor, so that the vacuum pump may be started normally. An operation control device 10 for a vacuum pump having a pump rotor 1 disposed in a casing 2 for free rotation includes a pump rotor control section 15 for controlling the rotation of the pump rotor 1. The pump rotor control section 15 has a function to, after a pump stop action has been taken, rotate the pump rotor 1 in forward and/or reverse directions according to a predetermined timing pattern and then stop the pump rotor 1.

Abstract: In a drain water discharging method for force-feeding drain water via a drain pump, clogging of a drain piping is prevented by controlling the drain pump. An air conditioner has a drain pan for collecting drain water that is dropped from a heat exchanger, a drain pump for discharging the drain water in the drain pan, and a DC motor for driving the drain pump. The DC motor for driving the drain pump is controlled to increase its rotating speed when a rotary torque of the DC motor is increased.

Abstract: A method and pump that accurately senses air in a fluid delivery line pulses or activates and deactivates the air sensor(s) multiple times during the pumping phase of the fluid delivery cycle and can generate alarms based upon a single indication or a cumulative indication of air in the line. The pump can include multiple air sensors spaced along the delivery line so that the method can use the multiple signals therefrom to distinguish real moving air bubbles from false positives and/or air bubbles adhered to the inner wall of the line.

Abstract: An electronic pool pump timer that controls the run time or the pump for a period of time each day depending on the date. In the preferred embodiment, the user enters the historical daily maximum and minimum pump run times for the specific pool and the system calculates the required time the pump will run on a given day. The customized run time is thus calculated as a function of the date and the minimum and maximum run times for a given pool. The system then self-adjusts the run time each day as necessary. The device comprises a data input means, a display, memory, and a controller. It may also include a manual override to allow the user to turn the pump on at any time. The device is connected to the pump motor. The device is connected to a power supply and may also include a battery back-up in the event of a power outage. To prevent the pool from freezing. the system may also include an air temperature sensor that triggers pump operation when the ambient air is below a given temperature.

Abstract: A fluid delivery system for delivering a metered dose of fluid from a supply tank (28) to a downstream chamber or vessel (10), comprises a pump apparatus (20) comprising a pump plunger (32) which is operable to perform a pumping stroke under the control of an electromagnetic actuator (36), including a solenoid (36a), to effect delivery of the fluid and a control unit (24) for supplying an input signal (58) to the solenoid (36a) to initiate a current flow to the solenoid (36a) and thereby initiate movement of the pump plunger (32). An electronic device (54) provides an output signal to indicate that movement of the pump plunger has stopped at the end of the pumping stroke, and a timer determines a time difference between the input signal (58) being supplied to the solenoid (36a) and the output signal being output by the electronic device (54).

Abstract: An electromagnetic valve at an intake side is provided between an intake port of a compressor body and a pneumatic line at an intermediate position of an intake pipe. The electromagnetic valve is opened/closed by the control unit. When the valve is opened, a communication of the intake port of the compressor body and the pneumatic line is allowed. When the valve is closed, the communication between the intake port and the pneumatic line is blocked. Under a start-up control of the compressor body, the electromagnetic valve at the intake side is opened to communicate the pneumatic line in the plant with the intake port of the compressor body for power supply to an electric motor to drive an orbiting scroll. The rattle of the orbiting scroll by an amount equal to the axial gap (play) is suppressed before starting a compression operation.

Abstract: A method of determining a flow rate of a pump involves determining a volume capacity for a flow line carrying produced fluids from the pump, determining a starting pressure for the flow line and setting an arbitrary target pressure for the purpose of testing. The test is initiated by preventing flow in the flow line while continuing to operate the pump and monitoring pressure in the flow line to determine a time interval required to reach the target pressure. The method then involves performing calculations to determine flow rate using the volume capacity, the starting pressure, the change in pressure over the time interval required to reach the target pressure. The flow rate is equivalent to ?V divided by a change in time ?T. The method is preferably used as part of a manual or automated pump control strategy to keep the pump operating within flow rate ranges that provide optimum pump efficiency.

Abstract: A driving apparatus of a motor capable of operating a motor of a reciprocating compressor stably by using a simple power voltage control unit. The apparatus includes a power voltage control unit for maintaining a power voltage supplied from a power supply unit as a certain value when a motor is operated, outputting the certain power voltage or cutting off the power voltage after a certain time has passed; and a capacitor for applying the power voltage supplied from the power supply unit to the motor when the power voltage control unit cuts off the power voltage.

Abstract: A method and system are disclosed for adjusting the torque of a motor for a HVAC actuator based upon one or more operating conditions of the HVAC actuator. One illustrative HVAC actuator includes an actuated part, a motor for providing a torque to move the actuated part, a detector for detecting an operating condition in or around the HVAC actuator, and a controller for adjusting the torque in accordance with the detected operating condition.

Abstract: A control device (10) for controlling a shower waste pump, comprises a housing (12) which is mountable to a supporting surface, pump setting means (14) located in and/or on the housing (12), and over-run setting means (16) located in and/or on the housing (12). The pump setting means (14), by way of a control element, preferably a manually adjustable potentiometer (42), allows selective setting of a maximum pumping capacity of the waste pump. The over-run setting means (16), also by way of a control element (48), allows selective setting of an over-run period from a predetermined range during which the waste pump continues to operate after fluid flow through the waste pump has ceased or substantially ceased. The over-run setting means (16) and the pump setting means (14) together can optimise operation of the waste pump, so that the over-run period of the waste pump can be set based on the selected maximum pumping capacity.

Abstract: An adjustable frequency pump control system (10) that is primarily designed for use in commercial pool filtration systems. The system (10) automatically selects one of three operating speeds that control the speed of a motor that operates a circulation pump (62). The system (10) includes a programmed logic control (PLC) (42) that is activated upon the application of select mode signal (31), a mode timing signal (35), a line pressure signal (37), a circulation pump-run signal (39) and a backwash signal (41). The output of the PLC (42) is a frequency set signal (17) that is applied to an adjustable frequency drive (AFD) (18). From the output of the AFD (18) a motor speed control signal is produced that is applied to the motor that operates the circulation pump (62). The speed of the circulation pump (12) is governed by the frequency of the motor speed control signal, wherein the frequency is determined by the motor speed that is applicable to a particular design point of the pump's filtration cycle.

Abstract: A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when system parameters are exceeded and/or fault conditions occur, can detect fault conditions, and can store fault conditions for later retrieval.

Abstract: A pressure sensor subsystem measures the pressure within a fuel pump and outputs an under-pressure signal when the measured pressure is below a predetermined threshold pressure value. A temperature sensor subsystem measures the temperature within the fuel pump and outputs an over-temperature signal when the measured temperature is above a predetermined threshold temperature value. A timing circuit monitors the pressure sensor subsystem and the temperature sensor subsystem for output of the under-pressure and over-temperature signals and outputs a pump disconnect signal when at least one of the signals is output for a prescribed time duration. A power controller disengages power from the pump upon output of a pump disconnect signal by the timing circuit.

Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, comprising a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by means of a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly comprises a logic module and a power module, which are arranged separately of each other.

Abstract: A method and apparatus for a pump control system. One or more embodiments of the invention include a pump controller that can perform a self-calibrating procedure, can provide precise motor speed control, can provide a limp mode before shutting down the motor when system parameters are exceeded and/or fault conditions occur, can detect fault conditions, and can store fault conditions for later retrieval.

Abstract: A system and method is disclosed for controlling the input electrical current to an infusion pump stepper motor based on predetermined torque requirements. The system can include a motor controller and a non-volatile memory containing expected load torque values throughout a pump cycle. Responsive to the expected load torque values, the motor controller provides the stepper motor with a varying electrical current for overcoming load torque at each point in the pumping cycle. Additional factors can also be considered for varying the electrical current. These factors include, but are not limited to, temperature, pressure, and elapsed operating time.

Abstract: In a compressor for gaseous media, in particular, refrigerants, comprising a housing, a drive shaft mounted in the housing, at least one compressor unit arranged in the housing and driven by the drive shaft, and an oil lubricating device for supplying bearing areas of the drive shaft with lubricating oil, in order to solve the problem that the compressor should be shut down when the oil supply of the oil lubricating device fails, it is proposed that the oil lubricating device comprise a lubricating oil reservoir lying above an oil sump in the housing and fillable from the oil sump by a lubricating oil conveying device, that the oil lubricating device comprise a lubricating oil duct system extending through the drive shaft for taking up lubricating oil from the lubricating oil reservoir via an inlet disposed on the drive shaft and conducting it to the bearing areas, and that a lubricating oil monitoring device be provided for detecting by means of a sensor associated with the lubricating oil reservoir the pres