US3608818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system control
Assignee: Individual
•
Filing: 1969-06-06
•
Granted: 1971-09-28
•
Expires: 1989-06-06
Abstract
Abstract A variable-speed pump is provided in a liquid feed line between a boiler and a heat exchanger, while a bypass line extends from a return line between the heat exchanger and boiler to a three-way valve in the feed line upstream from the pump. The pump speed is varied as a function of temperature changes and liquid pressure variations in the feed line under varying pump speeds actuate a control for the three-way valve. In a modified embodiment the pump speed is constant and liquid pressure variations in the feed line are produced by a temperature-responsive throttle valve.
Inventors
- 👤 Jost Eduard Von Fellenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:05
CPC Classifications
F; F24; F24D; F24D19/00; F24D19/10; F24D19/1006; F24D19/1009; F24D19/1012; F24D3/00; F24D3/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
In a heating system, the combination of a liquid boiler, a heat exchanger, a closed liquid circuit including a feed line and a return line between said boiler and said heat exchanger, a three-way valve in said feed line, a bypass line from said return line to said three-way valve, a variable-speed circulating pump in said feed line between said three-way valve and said heat exchanger, and control apparatus comprising a temperature-sensing device, a speed control responsive to said temperature-sensing device for varying the speed of said pump so that the pump speed is increased when the temperature sensed by said device decreases and vice versa, and means responsive to liquid pressure variations in said feed line under the varying speed of said pump for actuating said three-way valve, so that less liquid is circulated through said bypass line when the feed line pressure increases and vice versa.
Claim 2
Dependent Claim
148 words
In a heating system, the combination of a liquid boiler, a heat exchanger, a closed liquid circuit including a feed line and a return line between said boiler and said heat exchanger, a three-way valve in said feed line, a bypass line from said return line to said three-way valve, a variable-speed circulating pump in said feed line between said three-way valve and said heat exchanger, and control apparatus comprising a temperature-sensing device, a speed control responsive to said temperature-sensing device for varying the speed of said pump so that the pump speed is increased when the temperature sensed by said device decreases and vice versa, and means responsive to liquid pressure variations in said feed line under the varying speed of said pump for actuating said three-way valve, so that less liquid is circulated through said bypass line when the feed line pressure increases and vice versa.
Claim 3
Dependent Claim
61 words
The system as defined in claim 1 wherein said means responsive to liquid pressure variations in said feed line comprise a pressure-differential controller including a diaphragm and a pair of chambers at opposite sides of said diaphragm connected to said feed line at points respectively upstream and downstream from said pump, and means operatively connecting said diaphragm to said three-way valve.
Claim 4
Dependent Claim
78 words
The system as defined in claim 1 wherein said means responsive to liquid pressure variations in said feed line comprise a drag-actuated control member movable in upstream and downstream directions in the feed line and operatively connected to said three-way valve, and means biasing said control member in the upstream direction, increasing speed of said pump and resultant increasing pressure of the pumped liquid producing increasing drag to move said control member downstream against the upstream biasing means.
Claim 5
Dependent Claim
49 words
The control system as defined in claim 1 together with a pump bypass connected to said feed line at points upstream and downstream from said pump and downstream from said three-way valve, and a throttle valve in said pump bypass, said throttle valve being actuated by said temperature-sensing device.
Claim 6
Dependent Claim
120 words
In a heating system, the combination of a liquid boiler, a heat exchanger, a closed liquid circuit including a feed line and a return line between said boiler and said heat exchanger, a three-way valve in said feed line, a bypass line from said return line to said three-way valve, a circulating pump in said feed line between said three-way valve and said heat exchanger, and control apparatus comprising a temperature-sensing device, a throttle valve in said feed line between said pump and said heat exchanger, said throttle valve being responsive to said temperature-sensing device for varying the back pressure against said pump, and means responsive to pump back pressure variations in the feed line for actuating said three-way valve.
Claim 7
Dependent Claim
120 words
In a heating system, the combination of a liquid boiler, a heat exchanger, a closed liquid circuit including a feed line and a return line between said boiler and said heat exchanger, a three-way valve in said feed line, a bypass line from said return line to said three-way valve, a circulating pump in said feed line between said three-way valve and said heat exchanger, and control apparatus comprising a temperature-sensing device, a throttle valve in said feed line between said pump and said heat exchanger, said throttle valve being responsive to said temperature-sensing device for varying the back pressure against said pump, and means responsive to pump back pressure variations in the feed line for actuating said three-way valve.
Claim 8
Dependent Claim
49 words
The system as defined in claim 5 together with a pump bypass connected to said feed line at points upstream and downstream from said pump and downstream from said three-way valve, and another throttle valve in said pump bypass, said last-mentioned throttle valve being actuated by said temperature-sensing device.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |