US4249377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature sensing device for a hot gas engine heater head
Assignee: United Stirling AB and Co
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Filing: 1978-12-21
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Granted: 1981-02-10
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Expires: 1998-12-21
Abstract
Abstract An improved hot gas engine heater head where a thermocouple is coaxially positioned in an isolation tube having one closed end and the isolation tube is coaxially positioned in one of a plurality of heater tubes forming a part of a working gas path between two variable volume chambers and traversing a combustion gas flow path. The thermo-couple is in heat-transfer contact with the working gas and is physically isolated from the working and combustion gases. The temperature signal from the thermo-couple is conducted by a conduction wire passing through heat insulating material such that neither the thermo-couple nor the conduction wire is exposed directly to the working gas or the combustion gas.
Inventors
- 👤 Jan C. Bratt
- 👤 Stefan Lorant
- 👤 Kjell A. Pettersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:53
CPC Classifications
F; F02; F02G; F02G1/00; F02G1/04; F02G1/043; F02G1/053; F02G2255/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
112 words
In a hot gas engine heater head wherein a working gas path between two variable volume chambers includes one side of a manifold and a plurality of heater tubes connected to the one side of the manifold and extending into a combustion gas flow path, the opposite side of the manifold being embedded in heat-insulating material, the improvement comprising: an isolation tube having a closed end extending coaxially into one of said heater tubes and a thermo-couple coaxially positioned in said isolation tube, the other end of the isolation tube being mounted in a gas-tight connection with the embedded side of the manifold, said isolation tube being filled with a heat-transfer medium.
Claim 2
Dependent Claim
112 words
In a hot gas engine heater head wherein a working gas path between two variable volume chambers includes one side of a manifold and a plurality of heater tubes connected to the one side of the manifold and extending into a combustion gas flow path, the opposite side of the manifold being embedded in heat-insulating material, the improvement comprising: an isolation tube having a closed end extending coaxially into one of said heater tubes and a thermo-couple coaxially positioned in said isolation tube, the other end of the isolation tube being mounted in a gas-tight connection with the embedded side of the manifold, said isolation tube being filled with a heat-transfer medium.
Claim 3
Dependent Claim
33 words
The improvement of claim 1 wherein the diameter of said heater tube is increased to receive said isolation tube and to permit working gas flow in said heater tube around said isolation tube.
Claim 4
Dependent Claim
126 words
In a hot gas engine heater head wherein a working gas path between variable volume chambers includes a plurality of heater tubes extending from one side of a manifold and into a combustion gas flow path, the opposite side of the manifold being embedded in heat-insulating material, the improvement comprising: an isolation tube having a closed end extending coaxially into one of said heater tubes and a thermo-couple coaxially positioned in said isolation tube, the other end of the isolation tube being mounted in a gas-tight connection with the embedded side of the manifold, said isolation tube being filled with a heat-transfer medium, and a temperature signal conduction wire connected to the thermo-couple passing from the open end of the isolation tube through said heat-insulating material.
Claim 5
Dependent Claim
126 words
In a hot gas engine heater head wherein a working gas path between variable volume chambers includes a plurality of heater tubes extending from one side of a manifold and into a combustion gas flow path, the opposite side of the manifold being embedded in heat-insulating material, the improvement comprising: an isolation tube having a closed end extending coaxially into one of said heater tubes and a thermo-couple coaxially positioned in said isolation tube, the other end of the isolation tube being mounted in a gas-tight connection with the embedded side of the manifold, said isolation tube being filled with a heat-transfer medium, and a temperature signal conduction wire connected to the thermo-couple passing from the open end of the isolation tube through said heat-insulating material.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |