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New metal bellows mb-601 compressor / vacuum pump
NEW Metal Bellows MB-601 Compressor / Vacuum Pump
According to Marta at Senior Aerospace this pump has Teflon valves and repair parts are available from the Manufacturer. A new MB-601 has a new selling price of $9,674.00.
According to our research this item has many Scientific and Medical uses.
Below are LINKS and INFORMATION about this item:
Senior Aerospace Metal Bellows - Products - Compressors/Pumps - Bellows compressor - Hermetic compressor
http:// /pdf/metbell/Metal_Bellows.pdf
Metal Bellows Compressor/Vacuum Pumps
Senior Aerospace Metal Bellows compressors and vacuum pumps utilize our unique welded metal bellows technology as the pumping chamber. This bellows design allows for features that are not available with conventional vacuum pumps and compressors.
These products are suitable for use in extreme environments where zero leakage, zero contamination, high reliability, and long life are required. We are able to achieve this superior performance with non-wearing wetted surfaces fabricated from corrosion resistant stainless steels.
Design & Construction Features
Long Life Capable of a minimum of 10,000 hours continuous operation
Stainless Steel Construction All wetted surfaces are corrosion resistant stainless steel except for valve assembly gaskets that are either Teflon or Viton
No Maintenance No wearing surfaces and no lubrication required. Motor and driver assembly contain permanently lubricated bearings
Hermetically Sealed Employ welded bellows that provides positive containment and contamination free sampling. Every pump is tested to assure leak tight integrity to mass spectrometer levels
Infinite Number of Cycles Bellows and valves are designed with stress levels below defined endurance limits of materials allowing for an infinite number of cycles
Medical instrument gas sampling
Nuclear containment radiation monitoring
Ground based or airborne high voltage electronics cooling and waveguide pressurization
High temperature engine exhaust analysis
Toxic or costly gas processing
Contamination free samples for research and laboratory experiments
Potable water system compressor or vacuum waste system pump in aircraft
http://medicaldesign.com/pumps-valves/bellows_pump_works/
Bellows pump works cleanly and quietly
Bellows Division Sharon, Mass. metalbe
Pump technology that comes from the aircraft industry outperforms conventional piston pumps in medical applications that require high reliability and clean operation. These so-called bellows-type pump compressors can generate partial vacuum or pressurize a fluid. A closer look at their construction helps understand its advantages.
Like other positive-displacement pumps, a bellows pump forces fluid from an inlet to a discharge area. The pumps are driven by a motor, the shaft of which carries an eccentric cam to generate oscillations. This, in turn, connects to a drive shaft or driver. The bellows is welded at its stationary end to a terminal that houses a reed-valve assembly. As the motor shaft turns, the driver moves up and down, which forces the bellows to compress and then expand with each rotation of the eccentric.
The bellows is manufactured from contoured diaphragms stamped from thin stainless steel. Two diaphragms are welded at the inside diameter to form what's called a convolution. The bellows capsule comprises several convolutions stacked on an arbor and welded at the outside diameter.
Compressor technology uses a specially shaped plate or diaphragm in the bellows that is well suited for pump applications including the delivery of hyperbaric-chamber oxygen. Further, the bellows and reed valves experience stress levels below the defined endurance limits of the material. This allows an almost infinite pump life.
In addition, all wetted surfaces are made of stainless steel, except the valve-assembly gaskets. These are typically made from Teflon or Viton, and in some cases, replaced by aluminum O-rings.
The pumps are welded and so do not leak media. The bellows also provides a hermetic seal for the gas being pumped. The standard leak rate is 1 10-4 scc/sec He (standard cubic centimeters per second of helium), but pumps can be specified for leak rates as stringent as 1 10-9 scc/sec He.
In addition, bellows pumps do not shed particles during use, so media stays pure. And there are no wearing or sliding seals in the pumping mechanism. This eliminates lubricants that could become a source of contamination. Better yet, with no seals to wear out, pump performance does not degrade over time. Additionally, motor and driver bearings are permanently lubricated and sealed, and do not contact the media being pumped. Thus, bellows pump-compressors can run for a minimum of 10,000 hours of continuous operation.
In a bellows pump, the factors that affect flow are: effective area of the bellows, stroke, motor speed, and valve efficiency. Actual Free Flow = EA Stroke Motor Speed Valve Efficiency. These parameters are optimized for the required flow and discharge pressures. Consider these design variations when selecting a bellows pump.
* They come with either small, single heads, or twin heads. Single heads are best for light-duty, low flow, and low-pressure applications. A typical plot curve for a single-head pump shows a performance of 0.4 scfm (standard cubic feet per minute) at free flow. At a design pressure rating of 10 psi, a single-head pump's flow rate drops to 0.1 scfm.
* Twin-head pumps, on the other hand, are better for high flow and high-pressure applications. Such pumps can be plumbed in series or in parallel. Plumbing in series connects the inlet of one head to the system, while the outlet of that head connects to the inlet of the second head. The outlet of the second head connects to the system. A pump plumbed in parallel connects the inlets and outlets of each head to the system.
Twin-head pumps are capable of up to 6 scfm at free flow when plumbed in parallel and 3 scfm when in series. At a design pressure rating of 40 psi, parallel-plumbed pumps deliver about 0.5 scfm, while series-plumbed pumps deliver 2 scfm. Thus, parallel-plumbed pumps give a higher flow at lower discharge pressures, while series-plumbed pumps give a higher flow at higher discharge pressures.
Other considerations include media temperature and discharge pressure. High-temperature models can handle gases at up to 450 F. The pumps use a pedestal-mount motor instead of an integral one (which is limited to a maximum temperature of 105 F). This configuration keeps motors away from the high-temperature gas.
And high-pressure models allow discharge at up to 100 psi. The bellows in these are made of a slightly thicker material than standard models and can withstand a higher differential pressure. This is the pressure difference from the inside to the outside of the bellows.
Lastly, double-containment pumps move rare, toxic, or expensive gases. The pumps have a primary bellows, just as in a standard bellows pumps, plus an additional containment bellows. A third, smaller bellows mounts externally to the pump head. A leak in either of the larger bellows breaks the vacuum, causing the small bellows to extend and trip a sensor, which warns of the failure. Gas that is being pumped is still hermetically sealed by the remaining, intact bellows.
Of course, bellows pumps can be modified for various flow requirements. For yet lower flow rates, pumps can be built using different eccentrics that shorten the stroke. A variable-speed motor can also be used to slow the cycle rates. Other options include modified port configurations such as VCR fittings welded to the caps, and a variety of motors such as dc, three-phase, explosion proof, or totally-enclosed fan-cooled.
A table lists the company's bellows pump-compressor models for various design requirements.
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