IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0230827
(2016-08-08)
|
등록번호 |
US-10107669
(2018-10-23)
|
우선권정보 |
EP-15400038 (2015-08-13) |
발명자
/ 주소 |
- Krebs, Peter
- Mendick, Holger
- Vogler, Sven-Carsten
|
출원인 / 주소 |
- AIRBUS HELICOPTERS DEUTSCHLAND GMBH
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
A liquid level sensor comprising an inner capacitor tube, an outer capacitor tube and a probe foot suitable for placing the liquid level sensor on a bottom surface of a liquid tank, wherein a capacitor region arranged to hold a liquid is defined between the outer capacitor tube and the inner capacit
A liquid level sensor comprising an inner capacitor tube, an outer capacitor tube and a probe foot suitable for placing the liquid level sensor on a bottom surface of a liquid tank, wherein a capacitor region arranged to hold a liquid is defined between the outer capacitor tube and the inner capacitor tube, and wherein an insulating minimum distance is left between the inner capacitor tube base and the probe foot, the insulating minimum distance being sufficient to prevent a droplet of water on the probe foot from making contact with the inner capacitor tube.
대표청구항
▼
1. A liquid level sensor for a fuel tank in an aircraft, the liquid level sensor comprising an inner capacitor tube, an outer capacitor tube and a probe foot suitable for placing the liquid level sensor on a bottom wall of the fuel tank, the inner and outer capacitor tubes respectively extending upw
1. A liquid level sensor for a fuel tank in an aircraft, the liquid level sensor comprising an inner capacitor tube, an outer capacitor tube and a probe foot suitable for placing the liquid level sensor on a bottom wall of the fuel tank, the inner and outer capacitor tubes respectively extending upwardly relative to the probe foot from an inner capacitor tube base and an outer capacitor tube base in such a way that a capacitor region arranged to hold a liquid is defined between the outer capacitor tube and the inner capacitor tube, the inner capacitor tube being located at an inside of the outer capacitor tube, wherein an insulating minimum distance (id) along an elevation direction of the liquid level sensor is left between the inner capacitor tube base and the probe foot, the capacitor region and the probe foot being thereby separated by such insulating minimum distance (id), the insulating minimum distance (id) being sufficient to prevent a droplet of water on the probe foot from making contact with the inner capacitor tube, andwherein the inner capacitor tube base completely closes the inner capacitor tube at an end in such a way that an inner capacitor tube trap is defined at an inside of the inner capacitor tube between the inner capacitor tube base and the at least one draining hole defined in a wall of the inner capacitor tube, the inner capacitor tube trap being filled with a filling material for keeping liquids and particles from being retained therein. 2. The liquid level sensor of claim 1, wherein the inner capacitor tube comprises at least one draining hole facing the outer capacitor tube such that the liquid can enter the inside of the inner capacitor tube. 3. The liquid level sensor according to claim 1, wherein the inner capacitor tube base is attached to the probe foot by means of an insulating spacer located in an insulating region defined between the probe foot and the inner capacitor tube base. 4. The liquid level sensor according to claim 3, wherein the insulating spacer is conical. 5. The liquid level sensor according to claim 1, wherein the outer capacitor tube comprises a plurality of beams, each beam having a beam base attached to the probe foot, the plurality of beam bases thereby constituting the outer capacitor tube base, and each beam leaving a space with the adjacent beams for allowing the liquid to enter the capacitor region. 6. The liquid level sensor according to claim 1, wherein the outer capacitor tube base and the probe foot are separated by an outer minimum distance (od). 7. The liquid level sensor according to claim 6, wherein the insulating minimum distance (id) and the outer minimum distance (od) have the same value and the inner and outer capacitor tubes are concentric cylinders. 8. The liquid level sensor according to claim 1, wherein the outer capacitor tube is attached to the inner capacitor tube by means of at least one transversal insulating means which crosses the inner capacitor tube. 9. The liquid level sensor according to claim 1, wherein the insulating minimum distance (id) is equal to or greater than 6 mm. 10. The liquid level sensor according to claim 1, wherein the probe foot comprises a housing, and electronic means disposed in the housing for determining capacitance of the capacitor region and thus liquid level, the electronic means being electronically connected to the inner capacitor tube and to the outer capacitor tube. 11. A liquid fuel tank for an aircraft, the fuel tank comprising the liquid level sensor according to claim 1, the fuel tank extending in the elevation direction from a bottom wall up to a top level area, the bottom wall having a surface that is first covered with the liquid when the liquid is introduced in the fuel tank, wherein the probe foot is located on the bottom wall. 12. An aircraft comprising the fuel tank according to claim 11, the bottom wall of the fuel tank being closer than the top level area to an extended landing gear of the aircraft in an elevation direction of the aircraft. 13. The aircraft of claim 12, wherein the aircraft is a rotorcraft. 14. The liquid level sensor according to claim 1 wherein the probe foot is configured to extend outside of the fuel tank. 15. The liquid level sensor according to claim 1 wherein the outer capacitor tube is attached to the inner capacitor tube by at least one transversal insulator which crosses the inner capacitor tube, the insulator being located above the at least one draining hole. 16. The liquid level sensor according to claim 1 wherein the probe foot extends laterally beyond the outer capacitor tube, and the outer capacitor tube base and the probe foot are separated by an outer minimum distance. 17. A liquid fuel tank for an aircraft, the fuel tank comprising a fuel tank body and the liquid level sensor according to claim 1 attached to the fuel tank body. 18. The fuel tank according to claim 17 wherein the probe foot of the liquid level sensor extends outside of the fuel tank body. 19. The fuel tank according to claim 17 wherein the liquid level sensor further comprises at least one transversal insulator that attaches together the outer capacitor tube and the inner capacitor tube and that crosses the inner capacitor tube, the insulator being located above the at least one draining hole. 20. The fuel tank according to claim 17 wherein the liquid level sensor does not extend through a top area of the fuel tank body.
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