US3681566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating system for asphalt equipment
Assignee: Individual
•
Filing: 1970-10-23
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Granted: 1972-08-01
•
Expires: 1990-10-23
Abstract
Abstract A controlled heating system, in which heat-transfer oil, which is circulated through jacketed heating means installed in an asphalt tank, effects the production of a high heat input when oil is flowing, and a low heat input when oil is not flowing. ''''There are three electrical embodiments disclosed, one involving a plurality of electrically resistive elements all of which are connected to a source of electrical current when heat transfer fluid is flowing with at least one of the elements being disconnected when heat transfer fluid is not flowing; a second in which three electrically resistive elements are connected to a source of current in a Y-configuration when heat transfer fluid is not flowing and in a ''delta'' configuration when heat transfer fluid is flowing; and a third in which three electrically resistive elements are connected in a Y-configuration, all of the elements being energized for high capacity operation while only two elements are energized to effect heating at a lower rate. A fourth embodiment involves a gas-fired heating system.
Inventors
- 👤 William W Sellers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:06
CPC Classifications
F; F24; F24H; F24H1/00; F24H1/46; F24H1/22; F24H1/225
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
150 words
Apparatus for heating a fluid in a storage tank and a circulating heat transfer fluid comprising a storage tank, at least one heater adapted to be mounted at least partly within the interior of the storage tank, said heater being constructed and arranged to be operated to produce heat at a low level and to produce heat at a level higher than said low heat producing level, means providing a passage within said storage tank and in close proximity to and in heat exchange with said heater throughout at least part of its length, for conducting a flowing stream of heat-transfer fluid through the interior of said storage tank, and means responsive to the flowing or non-flowing condition of the heat-transfer fluid for effecting operation of said heater at said low heating level when heat-transfer fluid is not flowing and at said higher level when said heat-transfer fluid is flowing.
Claim 2
Dependent Claim
150 words
Apparatus for heating a fluid in a storage tank and a circulating heat transfer fluid comprising a storage tank, at least one heater adapted to be mounted at least partly within the interior of the storage tank, said heater being constructed and arranged to be operated to produce heat at a low level and to produce heat at a level higher than said low heat producing level, means providing a passage within said storage tank and in close proximity to and in heat exchange with said heater throughout at least part of its length, for conducting a flowing stream of heat-transfer fluid through the interior of said storage tank, and means responsive to the flowing or non-flowing condition of the heat-transfer fluid for effecting operation of said heater at said low heating level when heat-transfer fluid is not flowing and at said higher level when said heat-transfer fluid is flowing.
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1 wherein said passage for said heat-transfer fluid encloses at least in part the heater throughout at least a substantial portion of its heating surface.
Claim 4
Dependent Claim
73 words
Apparatus according to claim 2 in which said heater comprises a plurality of electrically resistive elements and said means for effecting operation of said heater includes means for connecting all of said resistive elements to a source of electrical current when said heat-transfer fluid is flowing, and for disconnecting at least one but less than all of said resistIve elements from said source of electrical current when said heat-transfer fluid is not flowing.
Claim 5
Dependent Claim
71 words
Apparatus according to claim 2 in which said heater comprises a plurality of electrically resistive elements and said means for effecting operation of said heater includes switching means for connecting said resistive elements to a source of current in a configuration presenting a high resistance to said source when said heat-transfer fluid is not flowing and in a configuration presenting a lower resistance to said source when said fluid is flowing.
Claim 6
Dependent Claim
58 words
Apparatus according to claim 2 in which said heater comprises three electrically resistive elements and said means for effecting operation of said heater includes switching means for connecting said resistive elements to a three-wire source of current in a Y-configuration when said heat-transfer fluid is not flowing and in a ''''Delta'''' configuration when said heat-transfer fluid is flowing.
Claim 7
Dependent Claim
63 words
Apparatus according to claim 2 in which said heater comprises means for burning a fluid fuel, and in which said means for effecting operation of said heater includes means for delivering fuel to said burner at a high rate when said heat-transfer fluid is flowing and for delivering fuel to said burner at a lower rate when said heat-transfer fluid is not flowing.
Claim 8
Dependent Claim
81 words
Apparatus according to claim 2 in which said heater comprises means for burning a fluid fuel, and in which said means for effecting operation of said heater includes means providing a first path for the flow of fuel from a supply to said burning means, means providing an additional path for the flow of fuel from a supply to said burning means, a valve in said additional path, and means for opening said valve when said heat transfer fluid is flowing.
Claim 9
Dependent Claim
87 words
Apparatus according to claim 2 including a pump for the heat-transfer fluid and in which said means responsive to the flowing or non-flowing condition of the heat-transfer fluid comprises means for simultaneously controlling the operation of said pump for pumping said heat-transfer fluid and controlling operation of said heater, the last-mentioned means being arranged to effect operation of said heater at a low heating level when said pump is not operating and to effect operation of said heater at a higher level when said pump is operating.
Claim 10
Dependent Claim
76 words
Apparatus according to claim 2 in which said means responsive to the flowing or non-flowing condition of the heat-transfer fluid includes a flow sensing means arranged to respond to the pressure of the heat-transfer fluid and connected to effect operation of said heater at a low heating level when the pressure of said fluid is low and to effect operation of said heater at a higher heating level when the pressure of said fluid is high.
Claim 11
Dependent Claim
14 words
Apparatus according to claim 9 wherein said flow sensing means comprises a pressure-operated switch.
Claim 12
Dependent Claim
56 words
Apparatus according to claim 2 including thermostatic means for regulating the temperature of the fluid in the storage tank by overriding said means responsive to the flow condition of the heat-transfer fluid to effect operation of said heater at a reduced heating level when the temperature of the fluid in the tank reaches a predetermined level.
Claim 13
Dependent Claim
56 words
Apparatus according to claim 2 including thermostatic means for regulating the temperature of the fluid in the storage tank by overriding said means responsive to the flow condition of the heat-transfer fluid to effect operation of said heater at a reduced heating level when the temperature of the fluid in the tank reaches a predetermined level.
Claim 14
Dependent Claim
75 words
Apparatus according to claim 2 including thermostatic means for regulating the temperature of the fluid in the storage tank by overriding said means responsive to the flow condition of the heat-transfer fluid to effect operation of said heater at a reduced heating level when the temperature of the fluid in the tank reaches a predetermined level, and manually operable means for rendering the last-mentioned thermostatic Means inoperative to reduce the heating level of said heater.
Claim 15
Dependent Claim
32 words
Apparatus according to claim 2 including thermostatic means responsive to the temperature of said heat-transfer fluid for shutting off the heater when the temperature of said fluid reaches a predetermined maximum limit.
Claim 16
Dependent Claim
61 words
Apparatus according to claim 2 in which said heater comprises at least one electrically resistive element adapted to be connected to a source of current, and including an interlock relay adapted to be operated when another electrical component supplied by said source of current is in operation, and connected to cut off the current in said resistive element when so operated.
Claim 17
Dependent Claim
25 words
Apparatus according to claim 1 wherein said passage for said heat-transfer fluid surrounds the heater throughout at least a substantial portion of its heating surface.
Claim 18
Dependent Claim
62 words
Apparatus according to claim 1 wherein said heater has an elongated portion extending into said storage tank, said portion is enclosed in an elongated casing extending into said storage tank, and said passage for said heat-transfer fluid encloses said casing to provide a passage chamber for said circulating heat-transfer fluid located between said heater casing and the fluid in said storage tank.
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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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |