US3817451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioner condensing system control
Assignee: HEIL-QUAKER HOME SYSTEMS Inc A CORP OF
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Filing: 1972-01-15
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Granted: 1974-06-18
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Expires: 1992-01-15
Abstract
Abstract An air conditioner condensing system control having a motor driven means for flowing cooling air in heat transfer association with a condenser thereof. The operation of the motor is controlled by a resistance means in series therewith and disposed in heat transfer association with the air flowed by the air flowing means. The control means further includes means for providing an adjustable additional voltage to the motor for modulating the speed thereof. The additional voltage supply means may comprise an inexpensive gated control element adapted to control only a portion of the total maximum power supply voltage to the motor. Means are provided for sensing the temperature of the condenser at a liquid-gas interface therein for controlling the gated control element.
Inventors
- 👤 R Ramsey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:13
CPC Classifications
F; F25; F25B; F25B49/00; F25B49/02; F25B49/027; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/923; Y10S388/934
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
131 words
In a system for modifying the temperature of a space and having a heat exchange element and motor driven fan for flowing air in heat transfer association with said heat exchange element, means for controlling the operation of the fan motor from a power supply, comprising: resistance means in series with said motor directly across said power supply for reducing the voltage to the motor to reduce the speed thereof, said resistance means being disposed to dissipate heat to said system; and control means responsive to a temperature condition of the system in parallel with said resistance means for providing an adjustable additional voltage to said motor for modulating the speed thereof, said resistance means having a value preselected to permit operation of the fan motor solely by current flow therethrough.
Claim 2
Dependent Claim
131 words
In a system for modifying the temperature of a space and having a heat exchange element and motor driven fan for flowing air in heat transfer association with said heat exchange element, means for controlling the operation of the fan motor from a power supply, comprising: resistance means in series with said motor directly across said power supply for reducing the voltage to the motor to reduce the speed thereof, said resistance means being disposed to dissipate heat to said system; and control means responsive to a temperature condition of the system in parallel with said resistance means for providing an adjustable additional voltage to said motor for modulating the speed thereof, said resistance means having a value preselected to permit operation of the fan motor solely by current flow therethrough.
Claim 3
Dependent Claim
53 words
The system of claim 1 wherein said control means includes a temperature sensing element disposed adjacent a preselected portion of said heat exchange element for response to temperature conditions in said heat exchange element at the preselected portion thereof, and means for modulating said additional voltage to the motor to control said level.
Claim 4
Dependent Claim
12 words
The system of claim 2 wherein said sensing element comprises a thermistor.
Claim 5
Dependent Claim
41 words
The system of claim 2 wherein said sensing element is disposed in the air flow path downstream of said heat exchange element whereby said sensing element responds to ambient air temperature as well as temperature conditions in said heat exchange element.
Claim 6
Dependent Claim
25 words
The system of claim 1 wherein said control means is arranged to shunt said resistance means to provide a full speed operation of said fan.
Claim 7
Dependent Claim
19 words
The system of claim 1 wherein said control means provides an additional voltage as a variably Chopped waveform voltage.
Claim 8
Dependent Claim
25 words
The system of claim 1 wherein said control means includes a thermistor sensing element electrically insulated from the heat exchange element by said flowed air.
Claim 9
Dependent Claim
35 words
The system of claim 1 wherein said control means includes a temperature sensing element spaced from the heat exchange element for response to temperature conditions in said heat exchange element at the preselected portion thereof.
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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) | 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 |