Liquid tank system with over pressure protection
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16K-024/00
B64D-037/08
B65D-090/34
B64D-037/14
B64D-037/32
출원번호
US-0277640
(2016-09-27)
등록번호
US-9981752
(2018-05-29)
발명자
/ 주소
Bergeron, Sebastien
Gauvin, Pierre
Vinski, Johnny
McMurray, Genevieve
출원인 / 주소
PRATT & WHITNEY CANADA CORP.
대리인 / 주소
Norton Rose Fulbright Canada LLP
인용정보
피인용 횟수 :
0인용 특허 :
17
초록▼
A liquid tank system comprises a main liquid tank, an outlet communicating between a fluid circuit and the main liquid tank, an inlet communicating between the fluid circuit and the main liquid tank, and an auxiliary cavity. First vent passage and second vent passage(s) communicate between the main
A liquid tank system comprises a main liquid tank, an outlet communicating between a fluid circuit and the main liquid tank, an inlet communicating between the fluid circuit and the main liquid tank, and an auxiliary cavity. First vent passage and second vent passage(s) communicate between the main liquid tank and the auxiliary cavity and allows liquid and gas to flow from the main liquid tank to the auxiliary cavity. The second vent passage has a flow control device regulating flow through the second vent passage and having a set point at which it allows liquid and gas to flow from the main liquid tank to the auxiliary cavity only when a pressure in the main liquid tank is beyond a threshold. The liquid tank system has an attitude envelope in which the liquid tank system is configured such that, in use, the flow control device blocks flow through the second vent passage when an end of the first vent passage in the main liquid tank is above a liquid level, and the flow control device allows gas and/or fluid flow through the second vent passage when main fluid tank pressure is above the threshold and the end of the first vent passage in the main liquid tank is below the liquid level.
대표청구항▼
1. A liquid tank system comprising: a main liquid tank,at least an outlet communicating between a fluid circuit and the main liquid tank,at least one inlet communicating between the fluid circuit and the main liquid tank,an auxiliary cavity,a first vent passage communicating between the main liquid
1. A liquid tank system comprising: a main liquid tank,at least an outlet communicating between a fluid circuit and the main liquid tank,at least one inlet communicating between the fluid circuit and the main liquid tank,an auxiliary cavity,a first vent passage communicating between the main liquid tank and the auxiliary cavity and configured to allow liquid and gas to flow at least from the main liquid tank to the auxiliary cavity, andat least one second vent passage communicating between the main liquid tank and the auxiliary cavity and configured to allow liquid and gas to flow at least from the main liquid tank to the auxiliary cavity, the at least one second vent passage having a flow control device configured to regulate flow through the at least one second vent passage, the flow control device having a set point at which it allows liquid and gas to flow from the main liquid tank to the auxiliary cavity only when a pressure in the main liquid tank is beyond a threshold, the liquid and gas flowing through the first vent passage below the threshold,wherein the liquid tank system has an attitude envelope in which the liquid tank system is configured such that, in use, the flow control device blocks flow through the at least one second vent passage when an end of the first vent passage in the main liquid tank is above a liquid level, and the flow control device allows gas and/or fluid flow through the at least one second vent passage when main fluid tank pressure is above the threshold and the end of the first vent passage in the main liquid tank is below the liquid level. 2. The liquid tank system according to claim 1, wherein the first vent passage allows liquid flow from the main liquid tank to the auxiliary cavity when the end of the first vent passage in the main liquid tank is below the liquid level. 3. The liquid tank system according to claim 2, wherein the at least one second vent passage allows liquid flow from the main liquid tank to the auxiliary cavity when the end of the first vent passage and an end of the at least one second vent passage in the main liquid tank are below the liquid level. 4. The liquid tank system according to claim 1, wherein the first vent passage is a continuously open passage. 5. The liquid tank system according to claim 1, wherein the auxiliary cavity is part of an auxiliary gear box. 6. The liquid tank system according to claim 1, comprising a plurality of the second vent passages each having one said flow control device. 7. The liquid tank system according to claim 6, wherein an end of a first of the plurality of the second vent passages in the main liquid tank is positioned to be above a liquid level when the end of the first vent passage and an end of a second of the plurality of the second vent passages in the main liquid tank are below the liquid level. 8. The liquid tank system according to claim 7, wherein the end of the second of the plurality of the second vent passages in the main liquid tank is positioned to be above a liquid level when the end of the first vent passage and the end of the first of the plurality of the second vent passages in the main liquid are below the liquid level. 9. The liquid tank system according to claim 6, wherein the attitude envelope is divided into two separate ranges of attitudes, and wherein a first of the second vent passages relieves excess pressure in the main liquid tank in one of the ranges of attitudes and a second of the second vent passages relieves excess pressure in the main liquid tank in the other one of the ranges of attitudes when the end of the first vent passage in the main liquid tank is under the liquid level. 10. A method for reducing a gas pressure in a main liquid tank in fluid communication with an auxiliary cavity by a first vent passage and at least a second vent passage, comprising: venting the main liquid tank with the first vent passage and blocking the at least one second vent passage with a flow control device when an end of the first vent passage in the main liquid tank is above a liquid level, andopening the flow control device to allow gas or liquid flow through the at least one second vent passage when pressure in the main liquid tank is above a pressure threshold and the end of the first vent passage in the main liquid tank is below a liquid level. 11. The method according to claim 10, further comprising allowing liquid flow from the main liquid tank through the first vent passage to the auxiliary cavity when the end of the first vent passage in the main liquid tank is below the liquid level. 12. The method according to claim 11, further comprising allowing liquid flow from the main liquid tank through the at least one second vent passage to the auxiliary cavity when the inlet end of the first vent passage and an inlet end of the at least one second vent passage in the main liquid tank are below the liquid level. 13. The method according to claim 11, further comprising continuously leaving the first vent passage open. 14. The method according to claim 11, wherein the attitude envelope is divided into two separate ranges of attitudes, and further comprising using a first of the second vent passages to relieve excess pressure of the main liquid tank in one of the ranges of attitudes, and using a second of the second vent passages to relieve excess pressure of the main liquid tank in the other one of the ranges of attitudes when the first vent passage is under the liquid level. 15. A liquid tank system comprising: a main liquid tank,at least an outlet communicating between a fluid circuit and the main liquid tank,at least one inlet communicating between the fluid circuit and the main liquid tank,an auxiliary cavity,a first vent passage communicating between the main liquid tank and the auxiliary cavity configured for liquid and gas to flow at least from the main liquid tank to the auxiliary cavity, andat least one second vent passage communicating between the main liquid tank and the auxiliary cavity and configured for liquid and gas to flow at least from the main liquid tank to the auxiliary cavity, the at least one second vent passage having a flow control device configured to regulate flow the at least one second vent passage, the flow control device having a set point at which it allows liquid and gas to flow from the main liquid tank to the auxiliary cavity only when a pressure in the main liquid tank is beyond a threshold, the liquid and gas flowing through the first vent passage below the threshold,wherein the liquid tank system has an attitude envelope in which the liquid tank system, in use, is vented in three modes,a first mode in which the flow control device blocks the at least one second vent passage with when an end of the first vent passage in the main liquid tank is above the liquid level,a second mode in which the flow control device allows gas flow through the at least one second vent passage when the end of the first vent passage in the main liquid tank is below the liquid level, anda third mode in which the flow control device allows liquid flow through the at least one second vent passage when liquid pressure is above the threshold and the end of the first vent passage in the main liquid tank is below the liquid level. 16. The liquid tank system according to claim 15, wherein the first vent passage allows liquid flow from the main liquid tank to the auxiliary cavity in the second mode and the third mode. 17. The liquid tank system according to claim 16, wherein the at least one second vent passage allows liquid flow from the main liquid tank to the auxiliary cavity in the third mode. 18. The liquid tank system according to claim 15, comprising a plurality of the second vent passages. 19. The liquid tank system according to claim 18, wherein an end of a first of the plurality of the second vent passages in the main liquid tank is positioned to be above a liquid level when the end of the first vent passage and an inlet end of a second of the plurality of the second vent passages in the main liquid tank are below the liquid level. 20. The liquid tank system according to claim 18, wherein the attitude envelope is divided into two separate ranges of attitudes, and wherein a first of the second vent passages relieves excess pressure in the main liquid tank in one of the ranges of attitudes and a second of the second vent passages relieves excess pressure in the main liquid tank in the other one of the ranges of attitudes when the end of the first vent passage in the main liquid tank is under the liquid level.
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