Douglas L Neuenfeldt

US Patent:

50366777, Aug 6, 1991

Filed:

Sep 7, 1989

Appl. No.:

7/404284

Inventors:

Douglas L. Neuenfeldt - Coon Rapids MN
David E. Thielman - Brooklyn Park MN

Assignee:

McLean Midwest Corporation - Brooklyn Park MN

International Classification:

F25D 2312

US Classification:

622591

Abstract:

An air conditioner having improved internal structure and intended specifically for cooling electronic enclosures has a cabinet containing a compresser, evaporator and condenser coils, a load air blower, an ambient air blower, and a single motor connected to both blowers. The interior of the cabinet is divided by upper and lower horizontal dividers into upper, central and lower compartments. The upper compartment is divided into a separate ambient air intake compartment and a separate load air intake compartment with both blowers and the motor being in the load intake compartment. The evaporator coil and the ambient intake compartment and associated structure are asymetrical as is the compresser installation. The load air inlet and outlet are on the back, the ambient inlet is on a side and the ambient outlet is on the bottom. This new air conditioner is of exceptionally small physical size for its cooling capacity and is relatively quiet and easy to manufacture.

US Patent:

50352814, Jul 30, 1991

Filed:

Sep 7, 1989

Appl. No.:

7/405285

Inventors:

Douglas L. Neuenfeldt - Coon Rapids MN
Roger A. Peterson - Lake Township, Kanabec County MN

Assignee:

McLean Midwest Corporation - Brooklyn Partk MN

International Classification:

H01L 23467
F28D 1502

US Classification:

165 76

Abstract:

A heat exchanger for cooling enclosures, typically electronic enclosures, has a box with a heat pipe type exchange element and upper and lower fan units. A novel element holder and box structure and arrangement of components provides for safety, NEMA-12 sealing, easy access and cleaning without tools, and enables the exchanger to be inverted end-for-end and mounted either on the inside or outside of the exchanger while providing a cover that easily comes off for service. The exchanger has an ambient fan and motor and a heat load fan and motor normally inside the box, and both fan and motors and the exchanger are movable to alternative positions for service. A method of servicing a heat exchanger is provided wherein two fans and motors, and a heat exchanger sequentially are unlocked and moved to alternative service positions.

US Patent:

20170232373, Aug 17, 2017

Filed:

Feb 14, 2017

Appl. No.:

15/432295

Inventors:

- Anoka MN, US
Douglas L. Neuenfeldt - Anoka MN, US
Jeffrey Thibedeau - Robbinsdale MN, US
William J. Nepsha - Zimmerman MN, US
Richard L. Raisanen - Coon Rapids MN, US
Michael J. Koehler - Ramsey MN, US
Paul H. Landgraf - White Bear Lake MN, US
Klaus-Peter Bachmann - Weissach, DE
Adam Pawlowski - Waldbronn, DE

International Classification:

B01D 46/00
H05K 7/20

Abstract:

A filter housing can support filter media for a fan arrangement. The filter housing can include a filter body with a first opening at a first end and a second opening at a second end. A bell portion can be disposed between the air inlet opening and the air outlet opening and can define a cavity within the housing body. An air-permeable filter support can extend into the cavity to support the filter media within the cavity, with the filter media spaced apart from at least one of the first and second openings.