David C Hustvedt

US Patent:

6375719, Apr 23, 2002

Filed:

Jul 13, 1999

Appl. No.:

09/352243

Inventors:

David C. Hustvedt - Boulder CO
James T. Bauder - Longmont CO

Assignee:

Acoustiflo, LLC - Boulder CO

International Classification:

B01D 4600

US Classification:

95273, 553851, 553852, 55418, 55467, 454187

Abstract:

The present invention includes a system and method for air flow improvement in central air handling systems primarily for buildings and clean rooms. It may include a return flow path, a reversing element, an axial flow device, and a supply flow path where at least a portion of a supply flow path is substantially parallel to the return flow path and one of the flow paths at least partially surrounds the other flow path and could include an annulus between the supply and return flow paths and may provide uniform flow to the axial flow device. The system could include a filter which could be inclined, converging, or a skewed flow face filter, or combinations thereof. It may also include a coil, with a variety of shapes including flat, circular, or frustoconical and could be arranged perpendicular to a primary flow direction of the one or both of the flow paths. The system might also include at least one boundary layer affecting element. A remote access and replacement filter changing element may be included.

US Patent:

7001140, Feb 21, 2006

Filed:

Dec 30, 2003

Appl. No.:

10/750604

Inventors:

David C. Hustvedt - Boulder CO, US
Anders O. Hustvedt - Boulder CO, US

Assignee:

Acoustiflo, Ltd. - Boulder CO

International Classification:

F04D 17/08

US Classification:

415 1

Abstract:

At least one embodiment of the present inventive technology focuses on a vaneless diffuser adapted for establishment extra-radially of a centrifugal fan, wherein the diffuser may effect an optimal transformation of velocity pressure into static pressure of a fluid (e. g. , air) impelled by a centrifugal fan by decreasing that fluid's tangential velocity as it travels through the diffuser, without causing recirculation of air output from the diffuser back into the diffuser. Such diffuser may effect such a decrease in tangential velocity by radially extending the interface through which impelled air is output from the diffuser to a downflow fluid handling environment such as, e. g. , a scroll and/or a plenum. The diffuser may converge in a direction parallel with the axis of rotation of the centrifugal fan to avoid fluid recirculation and/or may incorporate acoustical material so as to reduce the amount of material necessary for effective noise reduction as compared with convention noise reduction methods.

US Patent:

7357621, Apr 15, 2008

Filed:

Feb 21, 2006

Appl. No.:

11/359651

Inventors:

David C. Hustvedt - Boulder CO, US
Anders O. Hustvedt - Boulder CO, US

Assignee:

Acoustiflo, LLC - Boulder CO

International Classification:

F04D 29/44

US Classification:

4152245

Abstract:

At least one embodiment of the present inventive technology focuses on a vaneless diffuser adapted for establishment extra-radially of a centrifugal fan, wherein the diffuser may effect an optimal transformation of velocity pressure into static pressure of a fluid (e. g. , air) impelled by a centrifugal fan by decreasing that fluid's tangential velocity as it travels through the diffuser, without causing recirculation of air output from the diffuser back into the diffuser. Such diffuser may effect such a decrease in tangential velocity by radially extending the interface through which impelled air is output from the diffuser to a downflow fluid handling environment such as, e. g. , a scroll and/or a plenum. The diffuser may converge in a direction parallel with the axis of rotation of the centrifugal fan to avoid fluid recirculation and/or may incorporate acoustical material so as to reduce the amount of material necessary for effective noise reduction as compared with convention noise reduction methods.

US Patent:

59220953, Jul 13, 1999

Filed:

Mar 20, 1997

Appl. No.:

8/822587

Inventors:

David C. Hustvedt - Boulder CO
James T. Bauder - Longmont CO

Assignee:

Acoustiflo, LLC - Boulder CO

International Classification:

B01D 4600

US Classification:

553851

Abstract:

The present invention includes a system and method for air flow improvement in central air handling systems primarily for buildings and clean rooms. It may include a return flow path, a reversing element, an axial flow device, and a supply flow path where at least a portion of a supply flow path is substantially parallel to the return flow path and one of the flow paths at least partially surrounds the other flow path and could include an annulus between the supply and return flow paths and may provide uniform flow to the axial flow device. The system could include a filter which could be inclined, converging, or a skewed flow face filter, or combinations thereof. It may also include a coil, with a variety of shapes including flat, circular, or frustoconical and could be arranged perpendicular to a primary flow direction of the one or both of the flow paths. The system might also include at least one boundary layer affecting element. A remote access and replacement filter changing element may be included.

US Patent:

55402631, Jul 30, 1996

Filed:

Feb 27, 1995

Appl. No.:

8/394449

Inventors:

David C. Hustvedt - Boulder CO
James R. Cowles - Denver CO
James T. Peel - Longmont CO
Robert J. Alvarez - Westminster CO

Assignee:

H. J. Heinz Co. - Pittsburgh PA
Welbilt Corporation - Stamford CT

International Classification:

B67D 500

US Classification:

141104

Abstract:

The production of hot soup from soup concentrate involves the use of an apparatus that includes a housing having a refrigerated first section and a second section. A soup concentrate container is positioned within the refrigerated section for receiving soup concentrate and a discharge device is operatively associated with the soup concentrate container for discharging a predetermined amount of soup concentrate from the soup concentrate container. A nozzle which is adapted to be connected to a source of hot water is positioned in the second section of the housing for producing a stream of water. A movable tray is also positioned in the second section for receiving a cup or the like in which is to be mixed hot water and soup concentrate. A tray driving device is connected to the tray for moving the tray between various positions at which a cup is placed on the tray, soup concentrate is discharged into the cup and hot water is dispensed into the cup. A nozzle driving device is connected the nozzle for moving the nozzle and effecting a stirring action within the cup through movement of the hot water stream to thereby mix the hot water and soup concentrate in the cup.

US Patent:

20180283401, Oct 4, 2018

Filed:

Nov 21, 2017

Appl. No.:

15/820140

Inventors:

- Boulder CO, US
David Hustvedt - Boulder CO, US

International Classification:

F04D 29/62
F04D 29/44
F04D 29/42
F04D 29/66
F04D 29/46
F04D 25/08

Abstract:

Particular embodiments of the inventive technology present a method for optimizing fan performance by, e.g., adjusting fan efficiency and/or acoustics to match, or more closely match, system design requirements or preferences. Embodiments may involve the selection of a size of centrifugal fan from the plurality that can fit inside a certain housing, forming a fan unit that provides an annular output such selection may be made to achieve certain performance goals. Add-on appurtenances such as one or more of, e.g., an annular housing extension fixed vanes and acoustic treatment may be used to tailor the fan unit to meet system requirements, e.g., regarding efficiency, acoustic/sonic performance (e.g., noise generated by the fan), and/or static efficiency.

US Patent:

20150104294, Apr 16, 2015

Filed:

Apr 4, 2014

Appl. No.:

14/245947

Inventors:

- Boulder CO, US
David Charles Hustvedt - Boulder CO, US

Assignee:

Acoustiflo, LLC - Boulder CO

International Classification:

F04D 29/66

US Classification:

415119

Abstract:

Particular embodiments of the inventive technology may be described as an air handling shroud for establishment at the inlet area of a fan, the shroud adapted to realign and/or redistribute fan inlet flow so as to reduce fan-generated noise without unacceptably impairing fan efficiency and/or performance. Certain embodiments present a lattice arrangement of cells through which air flows; the shroud may protrude up from an inlet face lying in a plane defined by the fan (e.g., by the fan housing or an inlet cone). It may have a hemispherical shape and a lower resistance-per-area sector at the pole (or polar region) thereof. Optional componentry includes but is not limited to a flow obstructer established at a fan proximal portion of the shroud, and acoustic material established on surfaces of the cells of the shroud.