US3630004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for bag filters
Assignee: Phillips Petroleum Co
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Filing: 1969-03-03
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Granted: 1971-12-28
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Expires: 1989-03-03
Abstract
Abstract A bag filter system has an off gas conduit communicating with each compartment. Each conduit includes a valve controlling the discharge of off gas and a valve regulating the introduction of repressuring gas to its associated compartment. The valves are sequentially controlled to close the off gas conduit of each compartment for a predetermined period and admit repressuring gas for a predetermined shorter period.
Inventors
- 👤 James G Adair
- 👤 Harold L Boots
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:35
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/42; B01D46/44; B01D46/46; B01D46/02; B01D46/04; B01D46/4272
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
In a bag filter system wherein a smoke is filtered through bags in a plurality of compartments, each having a conduit for the discharge of off gas, a control valve in each conduit, a repressuring valve connected to introduce repressuring gas to each compartment, and means for feeding gas through said repressuring valves; a control unit for each compartment including timing means actuable to close the control valve of the associated compartment for a first predetermined period and to open the repressuring valve of the associated compartment for a second predetermined period shorter than said first predetermined period, and a control switch sequentially operable to energize said control units by actuating the timing means thereof; wherein the control switch is a two-gang step switch having a motor magnet, one gang having a set of contact points connected through respective time delay relays to said motor magnet, and the second gang having contact points connected in circuits to initiate actuation of the respective control units.
Claim 2
Dependent Claim
164 words
In a bag filter system wherein a smoke is filtered through bags in a plurality of compartments, each having a conduit for the discharge of off gas, a control valve in each conduit, a repressuring valve connected to introduce repressuring gas to each compartment, and means for feeding gas through said repressuring valves; a control unit for each compartment including timing means actuable to close the control valve of the associated compartment for a first predetermined period and to open the repressuring valve of the associated compartment for a second predetermined period shorter than said first predetermined period, and a control switch sequentially operable to energize said control units by actuating the timing means thereof; wherein the control switch is a two-gang step switch having a motor magnet, one gang having a set of contact points connected through respective time delay relays to said motor magnet, and the second gang having contact points connected in circuits to initiate actuation of the respective control units.
Claim 3
Dependent Claim
31 words
The system of claim 1 including an off gas header connected to said conduits, and wherein said feeding means includes a blower having its inlet connected to said off gas header.
Claim 4
Dependent Claim
148 words
The system of claim 2 wherein said valves are solenoid valves, and each control unit includes a relay, a first timer, and a second timer, each timer having a coil, one solenoid valve being connected in circuit with a normally open contact set of the first timer and a normally closed contact set of said relay, the coil of said first timer being connected in circuit with a normally open contact of said relay, and the other solenoid valve is connected in circuit with a normally open contact set of said second timer and a normally closed contact set of said relay, the coil of said second timer being connected in circuit with a normally open contact set of said relay, the coil of each relay being connected in circuit with a power source, a contact point and the contactor of the second gang of said step switch.
Claim 5
Dependent Claim
253 words
In a bag filter system wherein a smoke is filtered through bags in a plurality of compartments, each having a conduit for the discharge of off gas, a control valve at each conduit, a repressuring valve connected to introduce repressuring to each compartment, and means for feeding gas through said repressuring valves; a control unit for each compartment including timing means actuatable to close the control valve of the associated compartment for a first predetermined period and to open the repressuring valve of the associated compartment for a second predetermined period shorter than said first predetermined period, and a control switch sequentially operable to energize said control units by actuating the timing means thereoF; wherein said valves are solenoid valves and each control unit includes relay means, a first timer and a second timer, each timer having a coil, one solenoid valve being connected in circuit with a normally open contact set of the first timer and a normally closed contact set of said relay means, the coil of said first timer being connected in circuit with a normally open contact of said relay means, and the other solenoid valve is connected in circuit with a normally open contact set of said second timer and a normally closed contact set of said relay means, the coil of said second timer being connected in circuit with a normally open contact set of said relay means, the actuating circuit of each relay means being connected in circuit with a power source and said control switch.
Claim 6
Dependent Claim
253 words
In a bag filter system wherein a smoke is filtered through bags in a plurality of compartments, each having a conduit for the discharge of off gas, a control valve at each conduit, a repressuring valve connected to introduce repressuring to each compartment, and means for feeding gas through said repressuring valves; a control unit for each compartment including timing means actuatable to close the control valve of the associated compartment for a first predetermined period and to open the repressuring valve of the associated compartment for a second predetermined period shorter than said first predetermined period, and a control switch sequentially operable to energize said control units by actuating the timing means thereoF; wherein said valves are solenoid valves and each control unit includes relay means, a first timer and a second timer, each timer having a coil, one solenoid valve being connected in circuit with a normally open contact set of the first timer and a normally closed contact set of said relay means, the coil of said first timer being connected in circuit with a normally open contact of said relay means, and the other solenoid valve is connected in circuit with a normally open contact set of said second timer and a normally closed contact set of said relay means, the coil of said second timer being connected in circuit with a normally open contact set of said relay means, the actuating circuit of each relay means being connected in circuit with a power source and said control switch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |