Patent US3695774A successfully refreshed from Google Patents.
US3695774A
Expired / Lapsed
US
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Blower system and control system therefor
Assignee: Individual
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Filing: 1971-06-01
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Granted: 1972-10-03
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Expires: 1991-06-01
Abstract
Abstract An automatic control system for high pressure blower applications prevents surging under variable supply flow rate requirements and achieves maximum efficiency of operation. The supply flow rate establishes the set point of a proportional plus reset controller, the latter receiving a feedback signal corresponding to the static discharge pressure of the supply blower and responding thereto for controlling the output of the supply blower. A return blower is controlled either through a characterizer relay in proportion to the control of the supply blower to maintain a fixed precalibrated relationship between supply and return flow rates or by a further proportional plus reset controller responsive to the supply flow rate, for establishing the set point thereof, and to the return flow rate, as a feedback signal thereto, for controlling the output of the return blower.
Inventors
- 👤 Lyle F Martz
- 👤 John W Nanz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:27
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/044; F04; F04D; F04D27/00; F04D27/003; F24F11/00; F24F11/70; F24F11/72; F24F7/00; F24F7/04; F24F7/06; F24F7/08
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
123 words
A blower control system comprising: first means for sensing the supply flow rate produced by a supply blower and generating an output representative thereof, second means for sensing the discharge pressure produced by the supply blower and generating an output representative thereof, control means responsive to the outputs of said first and second sensing means for producing a control output dependent on the difference between a desired relationship and the sensed relationship of the supply flow rate and the discharge pressure of the supply blower, and adjustment means responsive to the control output of said control means for adjusting the output of said supply blower to attain said desired relationship of the supply flow rate and the discharge pressure of said supply blower.
Claim 2
Dependent Claim
123 words
A blower control system comprising: first means for sensing the supply flow rate produced by a supply blower and generating an output representative thereof, second means for sensing the discharge pressure produced by the supply blower and generating an output representative thereof, control means responsive to the outputs of said first and second sensing means for producing a control output dependent on the difference between a desired relationship and the sensed relationship of the supply flow rate and the discharge pressure of the supply blower, and adjustment means responsive to the control output of said control means for adjusting the output of said supply blower to attain said desired relationship of the supply flow rate and the discharge pressure of said supply blower.
Claim 3
Dependent Claim
74 words
A blower control system as recited in claim 1, wherein: said control means includes means for presetting therein the desired relationship of the supply flow rate and the discharge pressure, and said control means responds to said supply flow rate representative output of said first means to establish a set point of operation, and to said discharge pressure representative output of said second means as a feedback signal, for producing the control output thereof.
Claim 4
Dependent Claim
38 words
A blower control system as recited in claim 1, wherein there is further provided first and second transmitting means associated with said first and second sensing means, respectively, for transmitting the respective outputs thereof to said control means.
Claim 5
Dependent Claim
54 words
A blower control system as recited in claim 1, wherein said adjustment means comprises: mechanically adjustable means associated with said supply blower and adapted for actuation to adjust the output thereof, and means responsive to the control output of said control means for producing a corresponding mechanical actuation for adjusting said mechanically adjustable means.
Claim 6
Dependent Claim
30 words
A blower control system as recited in claim 4, wherein said mechanically adjustable means comprise a system of louvers adjustable to vary the inlet air supply to said supply blower.
Claim 7
Dependent Claim
30 words
A blower control system as recited in claim 4, wherein said mechanically adjustable means comprise means for adjusting the pitch of the blades of a fan of the supply blower.
Claim 8
Dependent Claim
106 words
A blower control system as recited in claim 4, wherein there is further provided: means selectively operable to automatically transmit a signal received thereby and to be manually set to generate and transmit a signal, said selectively operable means being connected to receive the output of said control means and to transmit an output thereof to said adjustment means and effective when set for automatic operation to transmit the control output of said control means to said adjustment means and when selectively set for manual operation to develop and transmit a manually set signal to said adjustment means for adjusting the output of said supply blower.
Claim 9
Dependent Claim
107 words
A blower control system as recited in claim 1, wherein there is further provided: a return blower for exhausting air from a facility supplied by the output of said supply blower and returning the exhausted air to said supply blower for recirculation; and control means for said return blower responsive to the supply flow rate for producing a return control output related thereto for establishing a desired relationship of the return flow rate and the supply flow rate, and adjustment means responsive to the Return control output for adjusting the output of said return blower to attain said desired relationship of the supply and return flow rates.
Claim 10
Dependent Claim
81 words
A blower control system as recited in claim 8, where there is further provided: third means for sensing the return flow rate produced by the return blower and generating an output representative thereof, and said return control means responds to said supply flow rate representative output of said first sensing means to establish a set point of operation and to said return flow third representative output of said third sensing means as a feedback signal, for producing the return control output.
Claim 11
Dependent Claim
33 words
A blower control system as recited in claim 9, wherein there is further provided third transmitting means associated with said third sensing means for transmitting the output thereof to said third control means.
Claim 12
Dependent Claim
45 words
A blower control system as recited in claim 8, wherein said return control means comprises characterizer relay means responsive to the control output of said supply control means for producing the return control output in accordance with a predetermined relationship to said supply control output.
Claim 13
Dependent Claim
60 words
A blower control system as recited in claim 8, wherein said adjustment means comprises: mechanically adjustable means associated with said return blower and adapted for actuation to adjust the output thereof, and means responsive to the control output of said return control means for producing a corresponding mechanical actuation for adjusting said mechanically adjustable means associated with said return blower.
Claim 14
Dependent Claim
108 words
A blower control system as recited in claim 8, wherein said adjustment means comprises: means selectively operable to automatically transmit a signal received thereby and to be manually set to generate and transmit a signal, said selectively operable means being connected to receive the output of said return control means and to transmit an output thereof to said adjustment means and effective when set for automatic operation to transmit the control output of said return control means to said adjustment means and when selectively set for manual operation to develop and transmit a manually set signal to said adjustment means for adjusting the output of said return blower.
Claim 15
Dependent Claim
49 words
A system as recited in claim 1, wherein: said first and second means produce pneumatic signals representative of the sensed supply flow rate and discharge pressure, respectively, and said control means responds to the pneumatic output signals of said first and second means to produce a pneumatic control signal.
Claim 16
Dependent Claim
27 words
A blower control system as recited in claim 14, wherein said first sensing means produces a pressure differential pneumatic output signal corresponding to the supply flow rate.
Claim 17
Dependent Claim
18 words
A blower control system as recited in claim 15, wherein said first sensing means comprises a pitot tube.
References Cited (Backward Citations)
US2055193A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |