US5718822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure apparatus for detecting accumulation of particulates in a filter
Assignee: Metraflex Co
•
Filing: 1995-09-27
•
Granted: 1998-02-17
•
Expires: 2015-09-27
Abstract
Abstract An apparatus and a method are provided for detecting accumulation of particulates in a fluid stream. A differential pressure switch is incorporated in the apparatus for detecting changes in pressure in the fluid stream passing through a strainer having a filter wherein the particulates accumulate at the filter. A body is insertable into a wall of the strainer wherein the body is in communication with the fluid stream. A pressure responsive device is responsive to changes in pressure in the fluid stream due to accumulation of the particulates. A signal producing device is activated to produce a signal upon detection of a predetermined pressure differential in the fluid.
Inventors
- 👤 James R. Richter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:37
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/14; B01D35/143
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
198 words
An apparatus for detecting accumulation of particulates in a fluid stream, said apparatus comprising: a strainer housing having an interior through which said fluid stream passes between an inlet and an outlet, and a threaded opening in communication with said interior; a filter situated intermediate said inlet and said outlet capable of collecting said particulates in said fluid stream; and a differential pressure switch capable of detecting a pressure difference between an upstream side of said filter and a downstream side of said filter and producing a signal upon detection of a predetermined pressure differential, said pressure switch comprising: a body insertable into said threaded opening of said strainer housing wherein said body has an interior with a first port in communication with said fluid stream upstream of said filter and a second port in communication with said fluid stream downstream of said filter; a diaphragm positioned in said body between said two ports to flex with changing pressure; a pair of normally separated electrical contacts and means associated with said diaphragm to cause engaging of said contacts upon sufficient flexure of said diaphragm; and signal producing means activated upon closure of said contacts to produce a signal.
Claim 2
Independent Claim
198 words
An apparatus for detecting accumulation of particulates in a fluid stream, said apparatus comprising: a strainer housing having an interior through which said fluid stream passes between an inlet and an outlet, and a threaded opening in communication with said interior; a filter situated intermediate said inlet and said outlet capable of collecting said particulates in said fluid stream; and a differential pressure switch capable of detecting a pressure difference between an upstream side of said filter and a downstream side of said filter and producing a signal upon detection of a predetermined pressure differential, said pressure switch comprising: a body insertable into said threaded opening of said strainer housing wherein said body has an interior with a first port in communication with said fluid stream upstream of said filter and a second port in communication with said fluid stream downstream of said filter; a diaphragm positioned in said body between said two ports to flex with changing pressure; a pair of normally separated electrical contacts and means associated with said diaphragm to cause engaging of said contacts upon sufficient flexure of said diaphragm; and signal producing means activated upon closure of said contacts to produce a signal.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 further comprising: output means receiving the signal from the differential pressure switch and producing an output signal.
Claim 4
Dependent Claim
11 words
The apparatus of claim 2 wherein the output signal is visible.
Claim 5
Dependent Claim
12 words
The apparatus of claim 1 wherein the strainer housing is a Y-type.
Claim 6
Dependent Claim
12 words
The apparatus of claim 1 wherein the strainer housing is a basket-type.
Claim 7
Dependent Claim
50 words
The differential pressure switch of claim 1 further comprising: a magnet carried on said diaphragm; a first contact in the interior of said body; and a second contact in the interior of the body attractable towards the first contact upon a predetermined movement of the magnet towards the second contact.
Claim 8
Dependent Claim
27 words
The apparatus according to claim 1, wherein said first port comprises an open end of said body and said diaphragm is positioned to cover said open end.
Claim 9
Dependent Claim
37 words
The apparatus according to claim 1, wherein said means associated with said diaphragm comprises a push rod in contact with said diaphragm wherein said push rod is arranged to move with said diaphragm when said diaphragm flexes.
Claim 10
Dependent Claim
29 words
The apparatus according to claim 8, wherein said push rod carries a first of said electrical contacts, while a second of said contacts is stationarily mounted within said body.
Claim 11
Dependent Claim
44 words
The apparatus according to claim 1, wherein said second contact includes a magnetically attractable connector which is normally biased away from said first contact, but which is attracted towards and into contact with said first contact when said magnet is moved towards said connector.
Claim 12
Independent Claim
248 words
An apparatus for detecting accumulation of particulates in a fluid stream, said apparatus comprising: a strainer housing having an interior through which said fluid stream passes between an inlet and an outlet and a threaded opening in communication with said interior; a filter situated intermediate said inlet and said outlet capable of collecting said particulates in said fluid stream; and a differential pressure switch capable of detecting a pressure difference between an upstream side of said filter and a downstream side of said filter and producing a signal upon detection of a predetermined pressure differential, said pressure switch comprising: a body insertable into said threaded opening of said strainer housing wherein said body has an interior with a first port forming an open end of said body in communication with said fluid stream upstream of said filter and a second port in communication with said fluid stream downstream of said filter; a diaphragm positioned to cover said open end of said body between said two ports to flex with changing pressure; a pair of normally separated electrical contacts and a push rod in contact with said diaphragm wherein said push rod carries a first of said contacts and is arranged to move with said diaphragm when said diaphragm flexes to cause said first contact to engage a second of said contacts which is stationarily mounted in said body upon sufficient flexure of said diaphragm; and signal producing means activated upon closure of said contacts to produce a signal.
Claim 13
Independent Claim
248 words
An apparatus for detecting accumulation of particulates in a fluid stream, said apparatus comprising: a strainer housing having an interior through which said fluid stream passes between an inlet and an outlet and a threaded opening in communication with said interior; a filter situated intermediate said inlet and said outlet capable of collecting said particulates in said fluid stream; and a differential pressure switch capable of detecting a pressure difference between an upstream side of said filter and a downstream side of said filter and producing a signal upon detection of a predetermined pressure differential, said pressure switch comprising: a body insertable into said threaded opening of said strainer housing wherein said body has an interior with a first port forming an open end of said body in communication with said fluid stream upstream of said filter and a second port in communication with said fluid stream downstream of said filter; a diaphragm positioned to cover said open end of said body between said two ports to flex with changing pressure; a pair of normally separated electrical contacts and a push rod in contact with said diaphragm wherein said push rod carries a first of said contacts and is arranged to move with said diaphragm when said diaphragm flexes to cause said first contact to engage a second of said contacts which is stationarily mounted in said body upon sufficient flexure of said diaphragm; and signal producing means activated upon closure of said contacts to produce a signal.
Claim 14
Dependent Claim
11 words
The apparatus according to claim 11, wherein said signal is visible.
Claim 15
Dependent Claim
11 words
The apparatus according to claim 11, wherein said signal is audible.
Claim 16
Dependent Claim
13 words
The apparatus according to claim 11, wherein said strainer housing is a Y-type.
Claim 17
Dependent Claim
13 words
The apparatus according to claim 11, wherein said strainer housing is a basket-type.
Claim 18
Independent Claim
264 words
An apparatus for detecting accumulation of particulates in a fluid stream, said apparatus comprising: a strainer housing having an interior through which said fluid stream passes between an inlet and an outlet and a threaded opening in communication with said interior; a filter situated intermediate said inlet and said outlet capable of collecting said particulates in said fluid stream; and a differential pressure switch capable of detecting a pressure difference between an upstream side of said filter and a downstream side of said filter and producing a signal upon detection of a predetermined pressure differential, said pressure switch comprising: a body insertable into said threaded opening of said strainer housing wherein said body has an interior with a first port forming an open end of said body in communication with said fluid stream upstream of said filter and a second port in communication with said fluid stream downstream of said filter; a diaphragm positioned to cover said open end of said body between said two ports to flex with changing pressure; a pair of normally separated electrical contacts and a magnet in contact with said diaphragm wherein said magnet is arranged to move with said diaphragm when said diaphragm flexes and wherein one of said electrical contacts includes a magnetically attractable connector which is normally biased away from the other of said contacts, but which is attracted towards and into contact with said other of said contacts when said magnet is moved towards said connector upon sufficient flexure of said diaphragm; and signal producing means activated upon closure of said contacts to produce signal.
Claim 19
Independent Claim
264 words
An apparatus for detecting accumulation of particulates in a fluid stream, said apparatus comprising: a strainer housing having an interior through which said fluid stream passes between an inlet and an outlet and a threaded opening in communication with said interior; a filter situated intermediate said inlet and said outlet capable of collecting said particulates in said fluid stream; and a differential pressure switch capable of detecting a pressure difference between an upstream side of said filter and a downstream side of said filter and producing a signal upon detection of a predetermined pressure differential, said pressure switch comprising: a body insertable into said threaded opening of said strainer housing wherein said body has an interior with a first port forming an open end of said body in communication with said fluid stream upstream of said filter and a second port in communication with said fluid stream downstream of said filter; a diaphragm positioned to cover said open end of said body between said two ports to flex with changing pressure; a pair of normally separated electrical contacts and a magnet in contact with said diaphragm wherein said magnet is arranged to move with said diaphragm when said diaphragm flexes and wherein one of said electrical contacts includes a magnetically attractable connector which is normally biased away from the other of said contacts, but which is attracted towards and into contact with said other of said contacts when said magnet is moved towards said connector upon sufficient flexure of said diaphragm; and signal producing means activated upon closure of said contacts to produce signal.
Claim 20
Dependent Claim
11 words
The apparatus according to claim 16, wherein said output signal visible.
Claim 21
Dependent Claim
12 words
The apparatus according to claim 16, wherein said output signal is audible.
Claim 22
Dependent Claim
13 words
The apparatus according to claim 16, wherein said strainer housing is a Y-type.
Claim 23
Dependent Claim
13 words
The apparatus according to claim 16, wherein said strainer housing is a basket-type.
References Cited (Backward Citations)
US2359938A
Cited
US2942572A
Cited
US3077176A
Cited
US3283902A
Cited
US3591003A
Cited
US4006083A
Cited
US4038189A
Cited
US4029042A
Cited
US4139466A
Cited
US4654140A
Cited
US4626344A
Cited
US4783256A
Cited
US5192425A
Cited
US5194160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |