US3907606A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat shield for temperature sensors
Assignee: Sunoco Inc R&M
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Filing: 1974-01-25
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Granted: 1975-09-23
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Expires: 1994-01-25
Abstract
Abstract For tubewall temperature measurement inside a process heater (fired heater), thermocouples are mounted inside the heater in contact with the tubewalls, by means of mounting blocks which are welded to the tubewalls. A radiant-heat shield is installed over each thermocouple mounting block and over a portion of the length of the corresponding sheathed thermocouple, between the thermocouple and the heat source (burner).
Inventors
- 👤 Robert C C Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:02
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/14; G01K1/143; G01K1/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
167 words
A SYSTEM FOR ALLOWING A TEMPERATURE SENSOR TO SENSE THE TEMPERATURE OF A HEATED BODY WHICH THE SENSOR IS IN THERMAL CONTACT WITH WILE PROTECTING THE SENSOR FORM BEINGIRRADIATED BY A HEAT SOURCE IN THE SYTEM AND COMPRISING: A. A BODY, THE TEMPERATURE OF WHICH IS TO BE MEASURED: B. A SOURCE OF HEART C. A TEMPERATURE SENSOR IN THERMAL CONTACT WITH SAID BODY FOR MEASURING THE TEMPERATURE OF SAID BODY, AND D. A HOOD MEANS INTERPOSED BETWEEN SAID HEAT SOURCE AND SAID TEMPERAURE SENSOR FOR REDUCING THE RADIATION DIRECTLY INCIDENT UPON SAID TEMPERATURE SENSOR TO ALLOW THE SENSOR TO MORE ACCURATELY MEASURE THE TEMPERATURE OF SAID BODY AND ALSO FOR ALLOWING THE SEVICE LIFE OF THE SENSOR TO BE EXTENDED, SAID HOOD MEANS INCLUDING A TOP SURFACE DIRECTLY INTERPOSED BETWEEN SAID HEAT SOURCE AND SAID SENSOR AND TWO SIDE SURFACES EXTENDING FROM SAID TOP SURFACE DOWN TO SAID BODY, SAID HOOD MEANS FURTHER DEFINING AN OPENING ACROSS ITS BOTTOM WITH SAID OPENING FITTING AGAINST SAID OBJECT.
Claim 2
Independent Claim
167 words
A SYSTEM FOR ALLOWING A TEMPERATURE SENSOR TO SENSE THE TEMPERATURE OF A HEATED BODY WHICH THE SENSOR IS IN THERMAL CONTACT WITH WILE PROTECTING THE SENSOR FORM BEINGIRRADIATED BY A HEAT SOURCE IN THE SYTEM AND COMPRISING: A. A BODY, THE TEMPERATURE OF WHICH IS TO BE MEASURED: B. A SOURCE OF HEART C. A TEMPERATURE SENSOR IN THERMAL CONTACT WITH SAID BODY FOR MEASURING THE TEMPERATURE OF SAID BODY, AND D. A HOOD MEANS INTERPOSED BETWEEN SAID HEAT SOURCE AND SAID TEMPERAURE SENSOR FOR REDUCING THE RADIATION DIRECTLY INCIDENT UPON SAID TEMPERATURE SENSOR TO ALLOW THE SENSOR TO MORE ACCURATELY MEASURE THE TEMPERATURE OF SAID BODY AND ALSO FOR ALLOWING THE SEVICE LIFE OF THE SENSOR TO BE EXTENDED, SAID HOOD MEANS INCLUDING A TOP SURFACE DIRECTLY INTERPOSED BETWEEN SAID HEAT SOURCE AND SAID SENSOR AND TWO SIDE SURFACES EXTENDING FROM SAID TOP SURFACE DOWN TO SAID BODY, SAID HOOD MEANS FURTHER DEFINING AN OPENING ACROSS ITS BOTTOM WITH SAID OPENING FITTING AGAINST SAID OBJECT.
Claim 3
Dependent Claim
109 words
A system as set forth in claim 1 and wherein: a. said temperature sensor comprises a thermocouple including a temperature measuring tip in contact with said body anD a stress relief zone adjacent to said temperature measuring tip wherein the thermocouple bows significantly away from said body with the result that said stress relief zone may be subjected to intense heating which would adversely affect the thermocouple; and b. said hood means is interposed between said heat source and said thermocouple including said temperature measuring tip and said stress relief zone, whereby said stress relief zone is protected from the intense heating to which it might otherwise be subjected.
Claim 4
Dependent Claim
111 words
A system as set forth in claim 2 and further including: a. a metallic member securely fastened to said body, said metallic member having means for mounting said thermocouple therein with said temperature measuring tip in intimate contact with said body, said metallic member providing a large effective heating area for absorbing radiation from said heat source and thereby possibly raising the temperature sensed by said thermocouple above the actual temperature of said body unless said hood means is provided; and b. means for mounting said hood means in place over said thermocouple and over said metallic member, and including means for securing said hood means directly to said metallic member.
Claim 5
Dependent Claim
39 words
A system as set forth in claim 3 and wherein said mounting means for said hood means includes means for permitting movement of said hood means to a position which allows access to and possible replacement of said thermocouple.
Claim 6
Dependent Claim
47 words
A system as set forth in claim 4 wherein said mounting means for said hood means includes a hinge member extending through said metallic member and secured to said hood means and a removable lock member extending through said metallic member and secured to said hood means.
Claim 7
Dependent Claim
31 words
A system as set forth in claim 5 wherein said hood means is open at its ends to permit a substantially unimpeded convective air flow under and through said hood means.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |