Heavy-Duty Self-Cleaning Centrifuge for Liquid / Solid Separation & Filtration

Bowl diagram and operating description: Seal water (1) is introduced into the bowl to seal the heavy phase liquid discharge to begin the process. Product is introduced through the hermetic style product feed (1) and the light phase liquid (3) and heavy phase liquid (2) is discharged under pressure by centripetal pumps installed inside the bowl. The liquid phases are regulated and controlled by backpressure regulating valves. The MAC 925 features an automatic self-cleaning centrifuge bowl that periodically opens discharging the accumulated solids from the sludge chamber (6). This action is regulated by an adjustable timer in the PLC / control panel (9) to control the open-water (7) and close-water (8) solenoids that distribute operating water (5) causing the sliding bowl bottom to rapidly open and close the bowl discharge ports. The action can be controlled for partial and full discharges to minimize product loss.

Centrifuge Bowl: Automatic self-cleaning bowl assembly features a duplex stainless steel bowl bottom and top for superior mechanical strength and chemical resistance. The bowl lock-ring is made of special AISI 400 series stainless steel. The internal bowl parts such as the distributor, conical separating discs, feed distributor, and the light and heavy phase centripetal discharge pumps are made from AISI 316 stainless steel.

Frame and Covers: Manufactured of cast iron, sandblasted, heat-treated, and epoxy painted. The frame must be secured to the floor using the supplied vibration absorbers and foundation bolts. The covers are made in aluminium and bolt to the base frame. The covers position the feeding pipe and the centripetal outlet pumps of the clarified liquid phases.

Drive: The horizontal shaft is moved through a mechanical coupling by an electric motor flanged directly onto the equipment frame and controlled by an inverter. On the horizontal shaft a worm-wheel gear engages the pinion gear fitted directly on the spindle, and the assembled bowl fits onto the tapered end. All the rotating shafts are mounted on ball bearings. The top vertical shaft bearing is located inside an appropriate shock-absorber collar, specifically designed to compensate for all radial vibrations.

Lubrication: Automatic splash lubrication is provided by an oil bath inside the frame. Appropriate caps allow the filling and emptying of the oil. A sight glass allows for easy inspection and control of the lubricating oil level.

Automation / Control Panel: Designed and built and pre-programmed with a PLC and integrated HMI to control and adjust all machine functions plus provide visual alarms for machine malfunctions. The panel also includes the drive motor VFD, which provides a more gradual starting load and ability to adjust RPM and centrifugal force. The VFD also provides a controlled gradual stop of the bowl during shut down.

The front of the control panel includes:

• Rotary disconnect switch
• HMI
• Centrifuge start/stop
• Power on light signal
• Alarm signal
• Emergency Stop switch
• VFD Hz visualization

Water Harness: The machine also includes the solenoid water harness assembly for operation of the bowl open and close auto discharge system.

Model MAC925 Technical Specifications: