Air filter monitoring tab

• US 9,463,406 B2
• Filed: 09/30/2014
• Issued: 10/11/2016
• Est. Priority Date: 09/30/2014
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Hopple, David E.
• Primary Examiner(s): Minskey, Jacob T
• Assistant Examiner(s): PHAM, MINH CHAU THI
• Application Number:
  US14/503,232
• Publication Number:
  US 20160089624A1
• Time in Patent Office: 742 Days
• Field of Search: 55D/IG.34, 116/268, 116/271, 116/270, 116/272, 116/266, 116/DIG.25, 964/21, 964/16, 964/17, 964/18, 964/22, 73/310.4
• US Class Current: 1/1
• CPC Class Codes: B01D 46/0002 Casings; Housings; Frame constructions
• CPC Class Codes: B01D 46/0086 Filter condition indicators

Abstract

An apparatus and method for monitoring reduced fluid flow through a filter. A filter, more particularly a fluid flow filter or an air filter when contaminated can suffer from a reduced fluid flow, which will often deform to match the fluid flow or more particularly in the case of an air filter—the air flow.

Claims

1. An apparatus for monitoring reduced fluid flow through a filter comprising:

an enclosed open ended channel extending from a facing side of a filter to a trailing side of the filter; and

a shuttle piston slidably fitting within said open ended channel and configured to resistively reciprocate through said open ended channel from the facing side of the filter to the trailing side of the filter responsive to a fluid flow pressure indicative of a predetermined reduction in a fluid flow.

2. The apparatus as recited in claim 1, where a size and a weight of the shuttle piston is based on one or more of a characteristic fluid flow of the filter, an area size of the facing side of the filter, a distance from the facing side of the filter to the trailing side of the filter and the fluid flow pressure.

3. The apparatus as recited in claim 1, where the shuttle piston has a trailing end, and where said trailing end is configured having a predetermined color providing a visual indicator.

4. An apparatus for monitoring reduced fluid flow through a filter comprising:

an enclosed open ended channel configured to extend a predetermined length where said predetermined length is sufficient to extend a distance corresponding to a thickness of a predetermined filter size; and

a shuttle piston slidably fitting within said open ended channel and configured to resistively reciprocate through said open ended channel from a facing side of the open ended channel to a trailing side of the open ended channel responsive to a predetermined fluid flow pressure.

5. The apparatus as recited in claim 4, where a size and a weight of the shuttle piston is based on one or more of a characteristic air flow, and the fluid flow pressure.

6. The apparatus as recited in claim 4, where the shuttle piston has a trailing end, and where said trailing end is configured having a predetermined color providing a visual indicator.

7. A method for monitoring reduced fluid flow through a filter comprising:

extending an enclosed open ended channel extending from a facing side of a filter through to a trailing side of the filter, where said enclosed open ended channel includes a shuttle piston slidably fitting within said open ended channel and configured to resistively reciprocate through said open ended channel from the facing side of the filter to the trailing side of the filter responsive to a fluid flow pressure indicative of a predetermined reduction in a fluid flow.

8. The method as recited in claim 7, further comprising:

laterally installing the filter in a duct where the facing side of the filter is orthogonally oriented with respect to a direction of the fluid flow.

9. The method as recited in claim 8, further comprising:

removing and replacing the filter if the shuttle piston has reciprocated to the trailing side of the filter.

10. The method as recited in claim 9, further comprising:

placing a predetermined color on a trailing end of the shuttle piston providing a visual indicator.