US3637006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proportioning control unit
Assignee: Forma Scientific Inc
•
Filing: 1970-04-08
•
Granted: 1972-01-25
•
Expires: 1990-04-08
Abstract
Abstract A control device for producing a first control variable or parameter substantially proportional to the duty cycle or ratio of ''''on'''' to ''''off'''' times of a second variable by heating a block of metal or other thermally conducting material during the ''''on'''' time of the second variable and utilizing the resultant block temperature or some other proportional variable as a control variable. In the preferred embodiment of this invention, the block temperature is used to establish the temperature and hence pressure of a closed body of fluid which pressure may be connected for use as a control variable. Several specific temperature regulation systems using such a control device in a refrigeration system are also enclosed.
Inventors
- 👤 Thomas K Decker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:40
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/70; F24F11/80; F24F11/83; F24F11/84; F25; F25B; F25B41/00; F25B41/20; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1913; F24F11/30; F24F2110/00; F24F2110/10; F25B2600/00; F25B2600/25; F25B2600/2501; F25B2700/00; F25B2700/21; F25B2700/2104
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
120 words
A temperature regulation system with proportioning refrigeration control for an environmentally controlled chamber, said system comprising: electrical heater means for supplying heat to said chamber, an on-off temperature control for switching said electrical heater means on and off in response to a comparison of a sensed temperature existing in said chamber and a predetermined setpoint temperature, a continuous running refrigeration means for removing heat from said chamber, regulating means for producing a controlled reduction in the efficiency or rate of heat removal by said refrigeration means, and proportioning control means for controlling said regulating means and causing said controlled reduction to be substantially proportional to the duty cycle or ratio of on to off time of said electrical heater means.
Claim 2
Dependent Claim
120 words
A temperature regulation system with proportioning refrigeration control for an environmentally controlled chamber, said system comprising: electrical heater means for supplying heat to said chamber, an on-off temperature control for switching said electrical heater means on and off in response to a comparison of a sensed temperature existing in said chamber and a predetermined setpoint temperature, a continuous running refrigeration means for removing heat from said chamber, regulating means for producing a controlled reduction in the efficiency or rate of heat removal by said refrigeration means, and proportioning control means for controlling said regulating means and causing said controlled reduction to be substantially proportional to the duty cycle or ratio of on to off time of said electrical heater means.
Claim 3
Dependent Claim
87 words
A system as in claim 1, wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulating means which is substantially proportional to the temperature of said block.
Claim 4
Dependent Claim
73 words
A system as in claim 1, wherein said refrigeration means includes: a compressor having a low- and a high-pressure port for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and wherein said regulating means includes valve means for operative connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from said high-pressure port to said cooling coils.
Claim 5
Dependent Claim
87 words
A system as in claim 3, wherEin said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulating means which is substantially proportional to the temperature of said block.
Claim 6
Dependent Claim
77 words
A system as in claim 1, wherein said refrigeration means includes: a compressor having a low- and high-pressure port for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and wherein said regulating means includes valve means for connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from fluid containing means operatively connected with said high-pressure port to said cooling coils.
Claim 7
Dependent Claim
87 words
A system as in claim 5, wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a central fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulation means which is substantially proportional to the temperature of said block.
Claim 8
Dependent Claim
72 words
A system as in claim 1, wherein said refrigeration means includes: a compressor having a low- and a high-pressure port for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and wherein said regulation means includes valve means for connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from said high-pressure port to said low-pressure port.
Claim 9
Dependent Claim
87 words
A system as in claim 7, wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulation means which is substantially proportional to the temperature of said block.
Claim 10
Dependent Claim
83 words
A system as in claim 1, wherein said refrigeration means includes: a compressor having a low- and high-pressure port for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and wherein said regulation means includes valve means for connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from fluid containing means effectively connected with said high-pressure port to fluid containing means effectively connected with said low-pressure port.
Claim 11
Dependent Claim
87 words
A system as in claim 9, wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulation means which is substantially proportional to the temperature of said block.
Claim 12
Dependent Claim
78 words
A system as in claim 1, wherein said refrigeration means incLudes: a compressor having a low- and a high-pressure port for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and wherein said regulation means includes valve means for connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from said high-pressure port to fluid containing means effectively connected with said low-pressure port.
Claim 13
Dependent Claim
87 words
A system as in claim 11 wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulation means which is substantially proportional to the temperature of said block.
Claim 14
Dependent Claim
78 words
A system as in claim 1, wherein said refrigeration means includes: a compressor having a low- and a high-pressure port for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and wherein said regulation means includes valve means for connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from fluid containing means effectively connected with said high-pressure port to said low-pressure port.
Claim 15
Dependent Claim
87 words
A system as in claim 13, wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control fluid pressure to said regulation means which is substantially proportional to the temperature of said block.
Claim 16
Dependent Claim
153 words
A system as in claim 1 wherein said refrigeration means includes: a compressor having a low- and a high-pressure side for compressing a cooling fluid, cooling coils disposed substantially within said chamber, and operatively connected to said low-pressure side of said compressor, condensing coils connected to said high-pressure side of said compressor, a flow restriction means connected to said cooling coils, capillary means operatively connected between said condensing coils and said flow restriction means for metering said cooling fluid therebetween, said regulating means includes valve means for operative connection to said proportioning control means, said valve means also being operatively connected for bypassing a controlled amount of relatively warm cooling fluid from said high-pressure side to a point between said capillary means and said flow restricting device for introducing said warm fluid into said cooling coils through said flow restricting means and for reducing the flow of cooling fluid through said capillary means.
Claim 17
Dependent Claim
86 words
A system as in claim 15 wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first mentioned electrical heater means is applying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control pressure to said regulating means which is substantially proportional to the temperature of said block.
Claim 18
Dependent Claim
118 words
A system as in claim 1 wherein said refrigeration means includes: a compressor having a low- and a high-pressure side for compressing a cooling fluid, cooling coils disposed substantially within said chamber and operatively coupled to said low-pressure side of said compressor, condensing coils connected to said high-pressure side of said compressor, capillary means operatively connected to said condensing coils and to said cooling coils for metering said cooling fluid therebetween, and wherein said regulating means includes valve means for operative connection to said proportioning control means, said valve means also being operatively connected in the system to effectively restrict the flow of said cooling fluid through said cooling coils thereby reducing the cooling capacity of the system.
Claim 19
Dependent Claim
114 words
A system as in claim 17 wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first-mentioned electrical heater means is not supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control pressure to said regulating means which is substantially proportional to the temperature of said blocks, and wherein said valve means is operative to proportionally open upon an increase in said control pressure and to proportionally close upon a decrease in said control pressure.
Claim 20
Dependent Claim
113 words
A system as in claim 17 wherein said proportioning control means includes: a block of thermally conducting material, a second electrical heater means for supplying heat to said block whenever said first-mentioned electrical heater means is supplying heat to said chamber, a fluid chamber means for containing a control fluid in thermal contact with said block, and control outlet means connected to said fluid chamber means for delivering a control pressure to said regulating means which is substantially proportional to the temperature of said block, and wherein, said valve means is operative to proportionally close upon an increase in said control pressure and to proportionally open upon a decrease in said control pressure.
References Cited (Backward Citations)
US3349840A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |