Patent US3859812A successfully refreshed from Google Patents.
US3859812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for treating machine tool coolants
Assignee: Individual
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Filing: 1974-03-08
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Granted: 1975-01-14
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Expires: 1994-03-08
Abstract
Abstract Methods and apparatus for treating machine tool coolants include a system for cooling a fluid with a refrigerant and metering the fluid to a heat exchanger, whence the fluid cools the machine tool coolant. A modulating control valve is adapted to meter the fluid to the heat exchanger in response to the temperature of the machine tool coolant exiting from the heat exchanger.
Inventors
- 👤 Richard B Pavlak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:19
CPC Classifications
F; F25; F25D; F25D17/00; F25D17/02; F25B; F25B41/00; F25B41/20; F25B2600/00; F25B2600/02; F25B2600/026; F25B2600/0261; Y; Y10; Y10S; Y10S62/00; Y10S62/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
Apparatus for cooling a fluid coolant for a machine tool comprising a first heat exchange unit, means for circulating the fluid coolant between the machine tool and said first heat exchange unit, a second heat exchange unit, means for circulating a first heat transfer fluid between said first heat exchange unit and said second heat exchange unit, a third heat exchange unit, means for circulating a second heat transfer fluid between said second heat exchange unit and said third heat exchange unit, and means for circulating a third heat transfer fluid through said third heat exchange unit, the third heat transfer fluid being effective to cool the second heat transfer fluid in said third heat exchange unit, the second heat transfer fluid being effective to cool the first heat transfer fluid in said second heat transfer unit, and the first heat transfer fluid being effective to cool the fluid coolant in the first heat exchange unit.
Claim 2
Dependent Claim
156 words
Apparatus for cooling a fluid coolant for a machine tool comprising a first heat exchange unit, means for circulating the fluid coolant between the machine tool and said first heat exchange unit, a second heat exchange unit, means for circulating a first heat transfer fluid between said first heat exchange unit and said second heat exchange unit, a third heat exchange unit, means for circulating a second heat transfer fluid between said second heat exchange unit and said third heat exchange unit, and means for circulating a third heat transfer fluid through said third heat exchange unit, the third heat transfer fluid being effective to cool the second heat transfer fluid in said third heat exchange unit, the second heat transfer fluid being effective to cool the first heat transfer fluid in said second heat transfer unit, and the first heat transfer fluid being effective to cool the fluid coolant in the first heat exchange unit.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1 further comprising means for selectively admitting the first heat transfer fluid to said first heat exchange unit in response to the temperature of the fluid coolant exiting from said first heat exchange unit.
Claim 4
Dependent Claim
104 words
The apparatus of claim 2 wherein said fluid admitting means comprises means for sensing the temperature of the fluid coolant exiting from said first heat exchange unit and a three-way modulating control valve responsive to said sensing means for controlling of the volume of the first heat transfer fluid admitted to said first heat exchange unit and for by-passing the remaining volume thereof to said second heat exchange unit, said admitting means being adapted to meter a volume of the first fluid to said first heat exchange unit sufficient to maintain the temperature of the fluid coolant exiting therefrom at a substantially constant level.
Claim 5
Dependent Claim
128 words
The apparatus of claim 1 wherein the second heat transfer fluid is a refrigerant, and further including compressing means intermediate said second and third heat exchange units for converting said refrigerant from a liquid to a hot gas, means for directing the refrigerant in the form of a hot gas to said third heat exchange unit, said third heat exchange unit being effective to condense the refrigerant to a liquid, means for directing said liquid refrigerant to said second heat exchange unit, and means for by-passing a portion of the refrigerant when in the form of a hot gas to the second heat exchange unit together with said liquid refrigerant to cause said compressing means to operate substantialLy continuously and significantly minimize the likelihood of compressing means failures.
Claim 6
Dependent Claim
137 words
Apparatus in combination with a machine tool for controlling the temperature of a fluid coolant used therein comprising a first heat exchange unit, means for circulating the fluid coolant between the machine tool and said first heat exchange unit, a second heat exchange unit, means for circulating a first heat transfer fluid between said first heat exchange unit and said second heat exchange unit, means for circulating a second heat transfer fluid through said second heat exchange unit to effect a cooling of said first heat transfer fluid therein, and means for selectively controlling the quantity of the first heat transfer fluid admitted to said first heat exchange unit in response to the temperature of the coolant exiting from said first heat exchange unit to control the temperature of the fluid coolant returned to the machine tool.
Claim 7
Dependent Claim
137 words
Apparatus in combination with a machine tool for controlling the temperature of a fluid coolant used therein comprising a first heat exchange unit, means for circulating the fluid coolant between the machine tool and said first heat exchange unit, a second heat exchange unit, means for circulating a first heat transfer fluid between said first heat exchange unit and said second heat exchange unit, means for circulating a second heat transfer fluid through said second heat exchange unit to effect a cooling of said first heat transfer fluid therein, and means for selectively controlling the quantity of the first heat transfer fluid admitted to said first heat exchange unit in response to the temperature of the coolant exiting from said first heat exchange unit to control the temperature of the fluid coolant returned to the machine tool.
Claim 8
Dependent Claim
107 words
The apparatus of claim 5 wherein said fluid admitting means includes means for sensing the temperature of the fluid coolant exiting from said first heat exchange unit, and a modulating control valve between said first and second heat exchange units, said control valve being actuated in response to a change in the exiting temperature of the fluid coolant as detected by said sensing means, and said control valve being effective to control the admission of the first heat transfer fluid to said first heat exchange unit and to maintain a relatively constant temperature of fluid coolant exiting from said first heat exchange unit to said machine tool.
Claim 9
Independent Claim
115 words
A method for cooling fluid machine tool coolants comprising the steps of circulating the fluid coolant between the machine tool and a first heat exchanger, circulating a refrigerant through a second heat exchanger, circulating an aqueous fluid between the second heat exchanger and the first heat exchanger to effect a cooling of the aqueous fluid in the second heat exchanger and a cooling of the fluid coolant in the first heat exchanger, sensing the temperature of the fluid coolant exiting from the first heat exchanger, and modulating the admission of the aqueous fluid to the first heat exchanger in response to changes in the temperature of the fluid coolant exiting from the first heat exchanger.
Claim 10
Independent Claim
115 words
A method for cooling fluid machine tool coolants comprising the steps of circulating the fluid coolant between the machine tool and a first heat exchanger, circulating a refrigerant through a second heat exchanger, circulating an aqueous fluid between the second heat exchanger and the first heat exchanger to effect a cooling of the aqueous fluid in the second heat exchanger and a cooling of the fluid coolant in the first heat exchanger, sensing the temperature of the fluid coolant exiting from the first heat exchanger, and modulating the admission of the aqueous fluid to the first heat exchanger in response to changes in the temperature of the fluid coolant exiting from the first heat exchanger.
Claim 11
Dependent Claim
51 words
The method of claim 7 further comprising the steps of sensing the temperature of the aqueous fluid exiting from the second heat exchanger, and controlling the admission of refrigerant to the second heat exchanger in response to changes in the temperature of the aqueous fluid circulating throug the first heat exchanger.
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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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |