Patent US3735566A successfully refreshed from Google Patents.
US3735566A
Expired / Lapsed
US
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Control system for a filtering apparatus
Assignee: ABB Flakt Inc
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Filing: 1971-01-04
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Granted: 1973-05-29
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Expires: 1991-01-04
Abstract
Abstract A fluidic control system for a filtering device employing a plurality of filters and means for causing a reverse flow through the filters to remove the impurities attached thereto. The control system acts to cause a plurality of rapid release valves to sequentially discharge a reservoir containing fluid under pressure into the filters as a predetermined pressure is attained in the reservoir. A time override control automatically advances the control system to a succeeding release valve if the previous release valve should fail to operate. The control system comprises pure fluidic components which operates without electrical or mechanical connections.
Inventors
- 👤 J Laliwala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:58
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0002; B01D46/0004; B01D46/42; B01D46/4272; B01D46/44; B01D46/446; B01D46/46; B01D46/66; B01D46/70; B01D46/71; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
A control system for a filtering apparatus of the type having a plurality of filter bags, a reservoir for fluid under pressure, means for rapidly discharging the fluid from said reservoir, said discharging means including a plurality of valves, each valve controlling the flow of fluid from said reservoir to at least one of said filter bags for the cleaning thereof with discharged fluid, wherein the improved control system comprises means for sensing the pressure of fluid in said reservoir, control means for generating a first fluidic signal in response to said sensing means detecting the predetermined pressure and a second fluidic signal in response to said first signal terminating, sequencing means including a plurality of output means, each output means adapted to convey an output fluidic signal to at least one of said valves for actuation thereof in response to the first signal, said sequencing means being operable to switch the output signal from one output means to another in response to said second signal, and timer means for producing the second signal in the event the second signal is not produced by said control means within a predetermined period of time.
Claim 2
Dependent Claim
193 words
A control system for a filtering apparatus of the type having a plurality of filter bags, a reservoir for fluid under pressure, means for rapidly discharging the fluid from said reservoir, said discharging means including a plurality of valves, each valve controlling the flow of fluid from said reservoir to at least one of said filter bags for the cleaning thereof with discharged fluid, wherein the improved control system comprises means for sensing the pressure of fluid in said reservoir, control means for generating a first fluidic signal in response to said sensing means detecting the predetermined pressure and a second fluidic signal in response to said first signal terminating, sequencing means including a plurality of output means, each output means adapted to convey an output fluidic signal to at least one of said valves for actuation thereof in response to the first signal, said sequencing means being operable to switch the output signal from one output means to another in response to said second signal, and timer means for producing the second signal in the event the second signal is not produced by said control means within a predetermined period of time.
Claim 3
Dependent Claim
21 words
A control system according to claim 1 including a display means responsive to the second fluidic signal from said timing means.
Claim 4
Dependent Claim
22 words
A control system according to claim 1 wherein the first signal terminates when the fluid under pressure is discharged from said reservoir.
Claim 5
Dependent Claim
51 words
A control system according to claim 1 comprising means for amplifying the output signal from an output means of said sequencing means to produce an amplified fluidic control signal, said amplifying means being adapted to convey said amplified fluidic control signal to at least one of said valves for actuation thereof.
Claim 6
Dependent Claim
50 words
A fluidic control system according to claim 1 wherein said discharging means comprises a rapid release valve having an inlet and an outlet, said inlet being connected to said reservoir, and a conduit connected to said outlet and having a plurality of discharge openings adjacent said filters to discharge fluid.
Claim 7
Dependent Claim
38 words
A fluidic control system according to claim 1 wherein said sequencing means includes a trigger means for advancing the output fluidic signal from one of said valves to another in response to sAid first fluidic signal being terminated.
Claim 8
Dependent Claim
252 words
A control system for a filtering apparatus of the type having a plurality of filter bags, a reservoir for fluid under pressure, a plurality of rapid release valves having an inlet and an outlet, said inlet being connected to said reservoir, and a conduit connected to said outlet having a plurality of discharge openings adjacent said filter bags to discharge fluid, wherein the improved control system comprises means for sensing the pressure of fluid in said reservoir, control means for generating a first fluidic signal in response to said sensing means detecting the predetermined pressure and a second fluidic signal in response to said first signal terminating, said first signal terminating when the fluid under pressure is discharged from said reservoir, sequencing means including a plurality of output means, each output means being connected to and adapted to convey an output fluidic signal for actuation of at least one of said valves in response to the first signal, said sequencing means including trigger means operable to switch the output signal from one output means to another in response to said second signal, means for amplifying the output signal from an output means of said sequencing means to produce an amplified fluidic control signal, said amplifying means being adapted to convey said amplified fluidic control signal to at least one of said valves for actuation thereof, and timer means for producing the second signal in the event the second signal is not produced by said control means within a predetermined period of time.
Claim 9
Dependent Claim
252 words
A control system for a filtering apparatus of the type having a plurality of filter bags, a reservoir for fluid under pressure, a plurality of rapid release valves having an inlet and an outlet, said inlet being connected to said reservoir, and a conduit connected to said outlet having a plurality of discharge openings adjacent said filter bags to discharge fluid, wherein the improved control system comprises means for sensing the pressure of fluid in said reservoir, control means for generating a first fluidic signal in response to said sensing means detecting the predetermined pressure and a second fluidic signal in response to said first signal terminating, said first signal terminating when the fluid under pressure is discharged from said reservoir, sequencing means including a plurality of output means, each output means being connected to and adapted to convey an output fluidic signal for actuation of at least one of said valves in response to the first signal, said sequencing means including trigger means operable to switch the output signal from one output means to another in response to said second signal, means for amplifying the output signal from an output means of said sequencing means to produce an amplified fluidic control signal, said amplifying means being adapted to convey said amplified fluidic control signal to at least one of said valves for actuation thereof, and timer means for producing the second signal in the event the second signal is not produced by said control means within a predetermined period of time.
Claim 10
Dependent Claim
21 words
A control system according to claim 7 including a display means responsive to the second fluidic signal from said timing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |