Patent US3817658A successfully refreshed from Google Patents.
US3817658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid control apparatus
Assignee: Tokyo Heat Treating Co
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Filing: 1972-03-20
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Granted: 1974-06-18
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Expires: 1992-03-20
Abstract
Abstract Fluid control apparatus comprises main fluid pumping means for receiving fluids from a basic input system and at least one additional input system and for feeding the fluids in mixture to an output system, auxiliary fluid pumping means associated with the additional input system, first control means is provided for detecting a deviation between the pressure prevailing in the output system and a setpoint pressure to thereby control the number of revolutions of the main pumping means in order to keep the output pressure thereof constant, second control means being provided for varying the number of revolutions of the auxiliary fluid pumping means, as a function of the number of revolutions of the main pumping means, to provide fluid flow rates which for a given number of revolutions of the main fluid pumping means will provide a constant pressure at the output system. By virtue of this control the fluid in the basic input system and that in the additional input system may be admixed in predetermined proportions while maintaining the mixture at a constant output pressure.
Inventors
- 👤 S Murase
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:25
CPC Classifications
G; G05; G05D; G05D11/00; G05D11/02; G05D11/13; G05D11/131; G05D11/132; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/0352; Y10T137/2496; Y10T137/2499
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
183 words
Fluid control apparatus comprising main fluid rotary pumping means for receiving fluids at its input from a basic input line and at least one other input line and for feeding fluids in a constant proportion mixture to an output line at constant pressure, said main rotary pumping means being rotatable at a variable number of revolutions and for predetermined numbers of revolutions thereof having predetermined fluid flow rates therethrough for maintaining the pressure in the output line constant, auxiliary pumping means in the other input line for pumping fluid therethrough to the input of said rotary pumping means error detector means operative to detect a deviation between the pressure in the output system and a set-point pressure for controlling the number of revolutions of the main pumping means, and second control means operative under control of said error detector means for controlling the number of revolutions of the auxiliary pumping means to provide fluid flow rates which at the controlled number of revolutions of the main pumping means ensure a constant mixed proportion and output pressure of the mixture at the output line.
Claim 2
Dependent Claim
183 words
Fluid control apparatus comprising main fluid rotary pumping means for receiving fluids at its input from a basic input line and at least one other input line and for feeding fluids in a constant proportion mixture to an output line at constant pressure, said main rotary pumping means being rotatable at a variable number of revolutions and for predetermined numbers of revolutions thereof having predetermined fluid flow rates therethrough for maintaining the pressure in the output line constant, auxiliary pumping means in the other input line for pumping fluid therethrough to the input of said rotary pumping means error detector means operative to detect a deviation between the pressure in the output system and a set-point pressure for controlling the number of revolutions of the main pumping means, and second control means operative under control of said error detector means for controlling the number of revolutions of the auxiliary pumping means to provide fluid flow rates which at the controlled number of revolutions of the main pumping means ensure a constant mixed proportion and output pressure of the mixture at the output line.
Claim 3
Dependent Claim
18 words
Fluid control apparatus according to claim 1, in which both main and auxiliary pumping means comprise rotary blowers.
Claim 4
Dependent Claim
18 words
Fluid control apparatus according to claim 1, in which both main and auxiliary pumping means comprise rotary pumps.
Claim 5
Dependent Claim
22 words
Fluid control apparatus according to claim 1, further including a valve interposed between the main pumping means and the auxiliary pumping means.
Claim 6
Dependent Claim
67 words
Apparatus according to claim 1, in which said error detector means includes means for producing an electrical output in response to a deviation between the pressure prevailing in the output system and a set-point pressure, and in which the second control means includes ratio controller means supplied with the electrical output from the error detector means for changing the number of revolutions of the auxiliary pumping means.
Claim 7
Dependent Claim
22 words
Fluid control apparatus according to claim 5, in which the electrical output from the ratio controller means is at a variable rate.
Claim 8
Dependent Claim
36 words
Apparatus according to claim 1, in which said error detector means includes means which provides a mechanical output in response to detection of a deviation between the pressure in the output system and a set-point pressure.
References Cited (Backward Citations)
US1452265A
Cited
US1807328A
Cited
US1961350A
Cited
US2671462A
Cited
US3250218A
Cited
US3072058A
Cited
US3584977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |