IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0393743
(2009-02-26)
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등록번호 |
US-8307626
(2012-11-13)
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발명자
/ 주소 |
|
출원인 / 주소 |
- United Technologies Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
7 인용 특허 :
17 |
초록
▼
A pump system for lubricating a bearing in a gear system includes an auxiliary pump connected to the gear system. The auxiliary pump is fluidically connected to the bearing through an auxiliary supply passage and to a reservoir through an auxiliary scavenge passage. An auxiliary valve is fluidically
A pump system for lubricating a bearing in a gear system includes an auxiliary pump connected to the gear system. The auxiliary pump is fluidically connected to the bearing through an auxiliary supply passage and to a reservoir through an auxiliary scavenge passage. An auxiliary valve is fluidically connected to the auxiliary supply passage for transferring liquid from the auxiliary pump to the bearing when a pressure in the auxiliary supply passage downstream of the auxiliary valve is less than a particular threshold and for transferring liquid from the auxiliary pump to the reservoir when the pressure in the auxiliary supply passage downstream of the auxiliary valve is greater than the particular threshold. A method for circulating liquid is also included.
대표청구항
▼
1. A pump system for lubricating a bearing in a gear system of a gas turbine, the pump system comprising: a main pump fluidically connected to the bearing through a main supply passage;an auxiliary pump mechanically connected to the gear system, wherein the auxiliary pump is fluidically connected to
1. A pump system for lubricating a bearing in a gear system of a gas turbine, the pump system comprising: a main pump fluidically connected to the bearing through a main supply passage;an auxiliary pump mechanically connected to the gear system, wherein the auxiliary pump is fluidically connected to the bearing through an auxiliary supply passage and to a reservoir through an auxiliary scavenge passage;an auxiliary valve fluidically connected to the auxiliary supply passage, for transferring liquid from the auxiliary pump to the bearing when a pressure in the auxiliary supply passage downstream of the auxiliary valve is less than a particular threshold, and for transferring liquid from the auxiliary pump to the reservoir when the pressure in the auxiliary supply passage downstream of the auxiliary valve is greater than the particular threshold; and a compartment wall defining a compartment cavity, wherein the reservoir is positioned at a bottom of the compartment cavity, wherein a portion of the compartment wall defines the reservoir, and wherein the compartment cavity contains the auxiliary pump, the auxiliary valve, and the bearing. 2. The pump system of claim 1, and further comprising: a manifold connected to the main supply passage between the main pump and the bearing and connected to the auxiliary supply passage between the auxiliary valve and the bearing; anda main reservoir which is different from the reservoir, which is connected to the main pump through a main supply passage, and which is connected to the reservoir through a main scavenge passage. 3. The pump system of claim 2, wherein the auxiliary valve comprises: a valve body defining a valve cavity;a manifold port in the valve body, the manifold port fluidically connecting the valve cavity to the manifold;a reservoir port in the valve body, the reservoir port fluidically connecting the valve cavity to the reservoir;an auxiliary pump port in the valve body, the auxiliary pump port fluidically connecting the valve cavity to the auxiliary pump; anda valve stem comprising a first end and a second end, the first end connected to a manifold disc and the second end connected to a reservoir disc, wherein the valve stem passes through the manifold port, the valve cavity, and the reservoir port, wherein the manifold disc is sized to close the manifold port, the reservoir disc is sized to close the reservoir port, and the valve stem is sized to allow liquid flow through the reservoir port when the manifold port is closed by the manifold disc. 4. The pump system of claim 3, wherein the auxiliary valve further comprises: a spring for applying a force on the valve stem, biasing the valve stem toward a position where the manifold disc does not close the manifold port. 5. The pump system of claim 3, wherein the manifold port has a greater flow area than the reservoir port. 6. The pump system of claim 1, and further comprising: a main scavenge passage fluidically connecting the main pump to the reservoir, wherein the main scavenge passage has a main scavenge inlet positioned in the reservoir and the auxiliary scavenge passage has an auxiliary scavenge inlet positioned in the reservoir, wherein the reservoir has a reservoir bottom, and wherein the auxiliary scavenge inlet is oriented closer to the reservoir bottom than the main scavenge inlet is to the reservoir bottom. 7. The pump system of claim 1, wherein the gear system comprises a fan drive gear system connecting a fan shaft to a low pressure spool in a gas turbine engine. 8. The pump system of claim 7, wherein the main pump is connected through gearing to a high pressure spool. 9. A gas turbine engine comprising: a spool comprising a compressor fixedly connected to a turbine via a spool shaft;a fan drive gear system that includes a bearing;a fan shaft connected through the fan drive gear system to the spool;a reservoir for holding liquid; andan auxiliary pump system comprising: an auxiliary pump mechanically connected to the fan drive gear system and fluidically connected to the reservoir; anda valve, fluidically connected to the auxiliary pump via a first passage and to the bearing via a second passage, the valve comprising: a valve body defining a valve cavity;a first, second, and third port in the valve body;a valve member with a first position and a second position relative to the valve body, wherein the auxiliary pump is fluidically connected to the bearing through the first and second ports when the valve member is in the first position and wherein the auxiliary pump is fluidically connected to the reservoir through the first and third ports when the valve member is in the second position; and a compartment wall defining a compartment cavity, wherein the reservoir is positioned at a bottom of the compartment cavity, wherein a portion of the compartment wall defines the reservoir, and wherein the compartment cavity contains the auxiliary pump, the valve, and the bearing. 10. The gas turbine engine of claim 9, wherein the auxiliary pump system further comprises: a manifold fluidically connected to the second passage between the valve and the bearing. 11. The gas turbine engine of claim 10, wherein the valve member comprises: a valve stem comprising a first end and a second end, the first end connected to a manifold disc and the second end connected to a reservoir disc, wherein the valve stem passes through the second port, the valve cavity, and the third port, wherein the manifold disc is sized to close the second port, the reservoir disc is sized to close the third port, and the valve stem is sized to allow liquid flow through the third port when the second port is closed by the manifold disc. 12. The gas turbine engine of claim 10, wherein the valve further comprises: a spring for applying a force on the valve member, biasing the valve member toward the first position. 13. The gas turbine engine of claim 10, wherein the second port has a greater flow area than the third port. 14. A method for circulating liquid in a gas turbine engine, the method comprising: driving a main pump via a high pressure spool operably coupled to the main pump;pumping a lubricating liquid with the main pump from a main reservoir to a bearing, collecting the lubricating liquid in a collection reservoir which is different than the main reservoir after use by the bearing, and transferring the lubricating liquid from the collection reservoir back to the main reservoir, when a high pressure spool is rotating at an operating speed;driving an auxiliary pump via a fan shaft connected to the auxiliary pump via auxiliary pump gears;pumping the lubricating liquid with the auxiliary pump from the collection reservoir to the bearing and collecting the lubricating liquid in the collection reservoir after use by the bearing, when the high pressure spool is rotating below the operating speed; and a compartment wall defining a compartment cavity, wherein the collection reservoir is positioned at a bottom of the compartment cavity, wherein a portion of the compartment wall defines the collection reservoir, and wherein the compartment cavity contains the auxiliary pump and the bearing. 15. The method of claim 14, and further comprising the step of: dumping the lubricating liquid pumped by the auxiliary pump to the collection reservoir prior to lubricating the bearing, when the high pressure spool is rotating at the operating speed. 16. The method of claim 14, and further comprising the steps of: collecting the lubricating liquid pumped by the main pump in a manifold prior to supplying the lubricating liquid to the bearing, when the high pressure spool is rotating at the operating speed; andcollecting the lubricating liquid pumped by the auxiliary pump in the manifold prior to supplying the lubricating liquid to the bearing, when the high pressure spool is rotating below the operating speed. 17. The method of claim 16, and further comprising the step of: reducing flow of the lubricating liquid in a direction from the manifold to the main pump, when the high pressure spool is not rotating. 18. The method of claim 14, and further comprising the step of: pumping the lubricating liquid with the auxiliary pump from the collection reservoir to the bearing and collecting the lubricating liquid in the collection reservoir after use by the bearing, when the high pressure spool is not rotating. 19. The method of claim 14, and further comprising the step of: driving the fan shaft via a low pressure spool connected to the fan shaft via fan drive gears
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