US3739980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilation system for storerooms for root crops and similar products
Assignee: Novenco Building and Industry AS
•
Filing: 1971-11-30
•
Granted: 1973-06-19
•
Expires: 1991-11-30
Abstract
Abstract A ventilation system for storerooms for root crops and similar products, in which the amount of air exhausted from and injected into the room is adjusted by means of a damper controlled by a hydraulic thermostat arrangement in dependence on the temperature in the room as well as the ambient temperature, said thermostat arrangement having two operative states, so that the injection of ambient air is blocked at ambient temperatures either below or above a certain value independent on the room temperature in order to obviate undesired heating or cooling of the products stored due to injection of fresh air.
Inventors
- 👤 C Andersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:25
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/0001; F24F7/00; F24F7/04; F24F7/06; F24F7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
213 words
A ventilation system for storerooms for root crops and similar products, comprising a fan means for exhausting air from the room and injecting fresh air into the room; a damper mechanism for adjusting the amount of exhausted and injected air to provide recirculation of at least a part of the exhausted air; a drive means for operating said damper mechanism; a hydraulic thermostat for controlling in a first state the operation of said driving means in dependance on the temperature in the room and maintaining in a second state said damper mechanism in a substantially closed condition, in which injection of fresh air is substantially prevented and recirculation of the exhausted air is established; a fluid chamber in said hydraulic thermostat; a change-over piston mounted in said fluid chamber to be displaceable between two positions defining a first fluid volume in said chamber corresponding to said first state of the thermostat and a second fluid volume corresponding to said second state of the thermostat, respectively; and an external temperature sensor for controlling the position of said change-over piston in dependance on ambient temperature; whereby the change-over piston controlled by said sensor assumes one of said positions at ambient temperature below a predetermined value and the other position at ambient temperature above said value.
Claim 2
Dependent Claim
213 words
A ventilation system for storerooms for root crops and similar products, comprising a fan means for exhausting air from the room and injecting fresh air into the room; a damper mechanism for adjusting the amount of exhausted and injected air to provide recirculation of at least a part of the exhausted air; a drive means for operating said damper mechanism; a hydraulic thermostat for controlling in a first state the operation of said driving means in dependance on the temperature in the room and maintaining in a second state said damper mechanism in a substantially closed condition, in which injection of fresh air is substantially prevented and recirculation of the exhausted air is established; a fluid chamber in said hydraulic thermostat; a change-over piston mounted in said fluid chamber to be displaceable between two positions defining a first fluid volume in said chamber corresponding to said first state of the thermostat and a second fluid volume corresponding to said second state of the thermostat, respectively; and an external temperature sensor for controlling the position of said change-over piston in dependance on ambient temperature; whereby the change-over piston controlled by said sensor assumes one of said positions at ambient temperature below a predetermined value and the other position at ambient temperature above said value.
Claim 3
Dependent Claim
105 words
A system as claimed in claim 1, further comprising a compressed air or fluid cylinder cooperating with said thermostat; an actuation plunger mounted in said cylinder and connected with said change-over piston, a compressed air or fluid source for supplying compressed air or fluid to said cylinder; a two-way change-over valve connected between said cylinder and said source said valve controlled by said temperature sensor to connect in one of its two positions said source with said cylinder for supplying compressed air or fluid thereto; and an exhaust pipe connected to said valve for connecting, in the other position thereof, said cylinder with the ambient.
Claim 4
Dependent Claim
31 words
A system as claimed in claim 1, further comprising an adjusting cylinder connected to the hydraulic thermostat for adjusting the operating temperature thereof, said adjusting cylinder also incorporating said fluid chamber.
Claim 5
Dependent Claim
32 words
A system claimed in claim 2, wherein the change-over valve is an electromagnetic valve and said temperature sensor is constituted by an electrical sensor connected in the control circuit of said valve.
References Cited (Backward Citations)
US2290985A
Cited
US2917138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |