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issue: June 2009 APPLIANCE Magazine

Appliance Engineer - Technology Report
Stealthy Pump


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 A centrifugal pool and spa pump eliminates diffusers to reduce noise.

The Supa-Stelth pump

Despite eliminating the diffuser, the pump is engineered to be more efficient than most centrifugal water pumps. The Supa-Stelth pump comes from New Fluid Technology (Queensland, Australia; www.newfluidtechnology.com), which explains that the major source of noise from most pool and spa pumps is the collision of the impeller’s water wake with diffuser inlets. The company engineered its pump without a diffuser to eliminate that noise source.

The company maintained efficiency in the unit through the incorporation of a unique, high-efficiency impeller. A unique pump casing shape is designed to greatly reduce water momentum change through the pump.

The conventional electric motor cooling fan can also be a significant source of noise. The company engineered the JetFan motor cooling fan, replacing a conventional fan, to reduce the noise of any pump by 3 dBa or more.

 

Shown is the fiberglass-filled, high-strength nylon JetFan (left) and pure nylon JetFan (right).

Another development that aided in the engineering of the pump was solving the problem of molding complex impellers and fans. The company says that it is well known that a complex, overlapping bladed fan develops more pressure than an axial fan, but such a fan is difficult to manufacture. The company patented a manufacturing method that is designed to enable high-pressure fans to be molded at the same cost on the ad index page as conventional cooling fans.

The company explains that JetFan geometry is different because the fan blades converge, instead of diverging as they do on conventional fans. The trailing edges are closer together than those of an axial, mixed flow, or centrifugal fan, and there is a reduction in cross-sectional area between the blade trailing edges compared with the leading edges. Recirculation is significantly reduced. This, in combination with the high solidity (density of the fan blades) and mixed-flow geometry, creates a stall-free, highly efficient fan.

New Fluid explains: “The unique mix of blade convergence, high solidity, and mixed-flow geometry of the JetFan gives a higher efficiency than other fan types of comparable size (less electricity consumed). This also allows for a higher ‘static efficiency,’ a feature important to fan and appliance manufacturers because most appliances contain internal structures that obstruct flow, which produces back pressure resulting in recirculation.”

 

 A vent panel features fire containment capability and
low airflow resistance:

ApplianceMagazine.com/content/2212

Color Sensing Made Easy:

ApplianceMagazine.com/content/2195

 

 

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