US4431131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating arrangements and control systems therefor
Assignee: Dalgety Australia Operations Ltd
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Filing: 1981-07-14
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Granted: 1984-02-14
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Expires: 2001-07-14
Abstract
Abstract A control system for heating installations which is responsive to a pre-selected target air temperature and a pre-selected radiant heat output.
Inventors
- 👤 Malcolm B. McInnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:45
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/002; F23N5/00; F23N5/02; F23N5/022; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1912; G05D23/20; G05D23/24; F23N2225/00; F23N2225/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
208 words
A control system for a heating arrangement including: control means for controlling the heat output of the heating arrangement so as to heat a space to a pre-selected target air temperature, said control means comprising: air temperature control means for providing at least one output indicative of a difference between an existing air temperature and said pre-selected target air temperature, burner control means connected to said air temperature control means so as to receive said at least one output, and fuel control means, connected to said burner control means, for controlling the fuel supply of the heating arrangement under the control of said burner control means; and limiting means for limiting the radiant heat output of the heating arrangement by constraining the operation of said control means while simultaneously allowing some said heat output to heat the space to said target air temperature, said limiting means comprising a radiant heat selector connected to said fuel control means and operable to limit the operation of said fuel control means under the control of said burner control means so that the heat output of the heating arrangement enables said target air temperature to be approached but the radiant heat output of the heating arrangement is limited to a predetermined level.
Claim 2
Dependent Claim
208 words
A control system for a heating arrangement including: control means for controlling the heat output of the heating arrangement so as to heat a space to a pre-selected target air temperature, said control means comprising: air temperature control means for providing at least one output indicative of a difference between an existing air temperature and said pre-selected target air temperature, burner control means connected to said air temperature control means so as to receive said at least one output, and fuel control means, connected to said burner control means, for controlling the fuel supply of the heating arrangement under the control of said burner control means; and limiting means for limiting the radiant heat output of the heating arrangement by constraining the operation of said control means while simultaneously allowing some said heat output to heat the space to said target air temperature, said limiting means comprising a radiant heat selector connected to said fuel control means and operable to limit the operation of said fuel control means under the control of said burner control means so that the heat output of the heating arrangement enables said target air temperature to be approached but the radiant heat output of the heating arrangement is limited to a predetermined level.
Claim 3
Dependent Claim
27 words
A control system according to claim 1 wherein said fuel control means comprises at least one burner circuit adapted to control respective burners of the heating arrangement.
Claim 4
Dependent Claim
19 words
A control system according to claim 2 including circulation means for circulating heated air within the environment being heated.
Claim 5
Dependent Claim
18 words
A control system according to claim 3 wherein said circulation means is activated by said fuel control means.
Claim 6
Dependent Claim
18 words
A control system according to claim 4 wherein said circulation means is actuated whenever a burner is operating.
Claim 7
Dependent Claim
16 words
A control system according to claim 5 wherein said circulation means comprises an electrically powered fan.
Claim 8
Dependent Claim
16 words
A control system according to claim 2 including ignition means for igniting at least one burner.
Claim 9
Dependent Claim
23 words
A control system according to claim 7 wherein said ignition means is activated whenever fuel commences to flow through one or more burners.
Claim 10
Dependent Claim
21 words
A control system according to claim 2 wherein each burner circuit is operably connectable to one or more fuel actuating means.
Claim 11
Dependent Claim
17 words
A control system according to claim 9 wherein each said fuel actuating means comprises a solenoid valve.
Claim 12
Dependent Claim
21 words
A control system according to claim 9 wherein each burner circuit is operably connected to a pair of fuel actuating means.
Claim 13
Dependent Claim
24 words
A control system according to claim 1 wherein said air temperature control means includes a temperature responsive element and a target temperature control element.
Claim 14
Dependent Claim
29 words
A control system according to claim 1 wherein said air temperature control means comprises a wheatstone bridge circuit including a temperature responsive element and a target temperature control element.
Claim 15
Dependent Claim
34 words
A control system according to claim 13 wherein said temperature responsive element comprises a thermister and said target temperature control element comprises a potentiometer included in respective first and second arms of the bridge.
Claim 16
Dependent Claim
71 words
A control system according to claim 14 wherein one or more resistance elements forming a voltage divider with said second arm is provided in a third arm of the bridge and a further resistance element forming a voltage divider with said first arm is provided in a fourth arm, the junction of said resistance elements in said third arm constituting said at least one output of said air temperature control means.
Claim 17
Dependent Claim
18 words
A control system according to claim 1 wherein said burner control means comprises one or more voltage comparators.
Claim 18
Dependent Claim
16 words
A control system according to claim 16 wherein each said voltage comparator comprises a differential amplifier.
Claim 19
Dependent Claim
19 words
A control system according to claim 16 wherein each voltage comparator receives an output of said temperature control means.
Claim 20
Dependent Claim
11 words
A heating arrangement incorporating a control system according to claim 1.
Claim 21
Dependent Claim
30 words
A control system according to claim 1 wherein said radiant heat selector includes at least one gate between the output of the burner control means and the fuel control means.
Claim 22
Dependent Claim
72 words
A control system according to claim 20 wherein said at least one gate is adapted to receive at its first input an output of the burner control means and at its second input a gating signal from a control switch of the radiant heat selector, said at least one gate being arranged such that signals from the burner control means will pass through said gate only when coincident with said gating signal.
Claim 23
Dependent Claim
19 words
A control system according to claim 20 wherein said at least one gate comprises a two input AND gate.
Claim 24
Dependent Claim
24 words
A control system according to claim 21 wherein said control switch comprises a plurality of steering diodes and a selector supplying the gating signal.
Claim 25
Dependent Claim
14 words
A control system according to claim 23 wherein said selector comprises a rotary switch.
Claim 26
Dependent Claim
21 words
A control system according to claim 23 wherein said selector comprises an integrated circuit switching device having touch control switching inputs.
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) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |