Method and a device for balancing pressure in a turbojet bearing enclosure
First Claim
1. A pressure-balancing device for balancing pressure in at least one bearing enclosure of a turbojet, said enclosure being defined between a rotor mounted to rotate about an axis and a stator including a bearing support on which a bearing is mounted that bears against said rotor, said enclosure including a device for feeding said bearing with lubricating liquid, an air intake bringing into the enclosure pressurized air coming from a pressurization circuit, at least one sealing system placed between the stator and the rotor in front of and/or behind said bearing, a recovery system for recovering the lubricating liquid and a removal system for removing the air towards a venting circuit, wherein downstream from the bearing enclosure and in a duct of the venting circuit, said device comprises:
- a regulator system for regulating the flow rate of air removal that, as a function of engine speed, changes the flow section of the duct between a non-zero minimum flow section and a maximum flow section thus enabling said flow rate to be variable as a function of engine speed, to remain non-zero, and, at high speeds, to be lower than when the regulator system is absent, andwherein said regulator system includes a shut-off member mounted to move between a closed position in which said shut-off member occupies a large fraction of the section of the duct that then has a minimum flow section and an open position in which said shut-off member occupies a small fraction of the section of the duct that then has a maximum flow section, it being possible for said shut-off member to take up any intermediate position between said closed position and said open position, andwherein the air removal flow rate is at a non-zero minimum value for low engine speed and is variable, increasing with increasing engine speed up to a maximum air removal flow rate.
3 Assignments
0 Petitions
Accused Products
Abstract
A pressure-balancing device for balancing pressure in at least one bearing enclosure of a turbojet, the enclosure including a mechanism feeding the bearing with lubricating liquid, an air intake, at least one sealing system placed between the stator and the rotor in front of and/or behind the bearing, a recovery mechanism recovering the lubricating liquid, and a removal mechanism removing the mixture of air and of traces of lubricating liquid towards a venting circuit. Downstream from the bearing enclosure and in the venting circuit, the balancing device includes a regulator system regulating the air removal flow rate, thereby enabling the flow rate to be variable as a function of the speed of the engine, to remain non-zero, and, at high speeds, to be lower than when the regulator system is not included.
17 Citations
15 Claims
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1. A pressure-balancing device for balancing pressure in at least one bearing enclosure of a turbojet, said enclosure being defined between a rotor mounted to rotate about an axis and a stator including a bearing support on which a bearing is mounted that bears against said rotor, said enclosure including a device for feeding said bearing with lubricating liquid, an air intake bringing into the enclosure pressurized air coming from a pressurization circuit, at least one sealing system placed between the stator and the rotor in front of and/or behind said bearing, a recovery system for recovering the lubricating liquid and a removal system for removing the air towards a venting circuit, wherein downstream from the bearing enclosure and in a duct of the venting circuit, said device comprises:
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a regulator system for regulating the flow rate of air removal that, as a function of engine speed, changes the flow section of the duct between a non-zero minimum flow section and a maximum flow section thus enabling said flow rate to be variable as a function of engine speed, to remain non-zero, and, at high speeds, to be lower than when the regulator system is absent, and wherein said regulator system includes a shut-off member mounted to move between a closed position in which said shut-off member occupies a large fraction of the section of the duct that then has a minimum flow section and an open position in which said shut-off member occupies a small fraction of the section of the duct that then has a maximum flow section, it being possible for said shut-off member to take up any intermediate position between said closed position and said open position, and wherein the air removal flow rate is at a non-zero minimum value for low engine speed and is variable, increasing with increasing engine speed up to a maximum air removal flow rate. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pressure-balancing device for balancing pressure in at least one bearing enclosure of a turbojet, said enclosure being defined between a rotor mounted to rotate about an axis and a stator including a bearing support on which a bearing is mounted that bears against said rotor, said enclosure including a device for feeding said bearing with lubricating liquid, an air intake bringing into the enclosure pressurized air coming from a pressurization circuit, at least one sealing system placed between the stator and the rotor in front of and/or behind said bearing, a recovery system for recovering the lubricating liquid and a removal system for removing the air towards a venting circuit, wherein downstream from the bearing enclosure and in a duct of the venting circuit, said device comprises:
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a regulator system for regulating the flow rate of air removal that, as a function of engine speed, changes the flow section of the duct between a non-zero minimum flow section and a maximum flow section thus enabling said flow rate to be variable as a function of engine speed, to remain non-zero, and, at high speeds, to be lower than when the regulator system is absent, and wherein said regulator system includes a shut-off member mounted to move between a closed position in which said shut-off member occupies a large fraction of the section of the duct that then has a minimum flow section and an open position in which said shut-off member occupies a small fraction of the section of the duct that then has a maximum flow section, it being possible for said shut-off member to take up any intermediate position between said closed position and said open position, wherein the duct is mounted to rotate by the fact that it is fastened to the rotor and is thus driven in rotation by said rotor, and wherein said shut-off member is connected to a controller incorporated into the duct and changing the position of said shut-off member as a function of the speed of rotation of the rotor that varies with varying engine speed. - View Dependent Claims (8, 9, 10, 11, 15)
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12. A turbojet comprising:
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at least a front enclosure and/or a rear enclosure including a venting circuit that, downstream from a de-oiler, includes a duct inside the low-pressure rotor, wherein it includes a pressure-balancing device for balancing pressure in at least one bearing enclosure of said turbojet, said enclosure being defined between a rotor mounted to rotate about an axis and a stator including a bearing support on which a bearing is mounted that bears against said rotor, said enclosure including a device for feeding said bearing with lubricating liquid, an air intake bringing into the enclosure pressurized air coming from a pressurization circuit, at least one sealing system placed between the stator and the rotor in front of and/or behind said bearing, a recovery system for recovering the lubricating liquid and a removal system for removing the air towards a venting circuit, wherein downstream from the bearing enclosure and in a duct of the venting circuit, said pressure-balancing device includes a regulator system for regulating the flow rate of air removal that, as a function of engine speed, changes the flow section of the duct between a non-zero minimum flow section and a maximum flow section thus enabling said flow rate to be variable as a function of engine speed, to remain non-zero, and, at high speeds, to be lower than when the regulator system is absent, and wherein said regulator system includes a shut-off member mounted to move between a closed position in which said shut-off member occupies a large fraction of the section of the duct that then has a minimum flow section and an open position in which said shut-off member occupies a small fraction of the section of the duct that then has a maximum flow section, it being possible for said shut-off member to take up any intermediate position between said closed position and said open position, wherein the duct is mounted to rotate by the fact that it is fastened to the rotor and is thus driven in rotation by said rotor, and wherein said shut-off member is connected to a controller incorporated into the duct and changing the position of said shut-off member as a function of the speed of rotation of the rotor that varies with varying engine speed, for which pressure-balancing device the regulator system is mounted in the low-pressure rotor.
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13. A turbojet comprising:
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at least a front enclosure and/or a rear enclosure including a venting circuit that, downstream from the low-pressure rotor, includes a stationary duct, wherein it includes a pressure-balancing device for balancing pressure in at least one bearing enclosure of said turbojet, said enclosure being defined between a rotor mounted to rotate about an axis and a stator including a bearing support on which a bearing is mounted that bears against said rotor, said enclosure including a device for feeding said bearing with lubricating liquid, an air intake bringing into the enclosure pressurized air coming from a pressurization circuit, at least one sealing system placed between the stator and the rotor in front of and/or behind said bearing, a recovery system for recovering the lubricating liquid and a removal system for removing the air towards a venting circuit, wherein downstream from the bearing enclosure and in a duct of the venting circuit, said pressure-balancing device includes a regulator system for regulating the flow rate of air removal that, as a function of engine speed, changes the flow section of the duct between a non-zero minimum flow section and a maximum flow section thus enabling said flow rate to be variable as a function of engine speed, to remain non-zero, and, at high speeds, to be lower than when the regulator system is absent, and wherein said regulator system includes a shut-off member mounted to move between a closed position in which said shut-off member occupies a large fraction of the section of the duct that then has a minimum flow section and an open position in which said shut-off member occupies a small fraction of the section of the duct that then has a maximum flow section, it being possible for said shut-off member to take up any intermediate position between said closed position and said open position, for which pressure-balancing device the regulator system is mounted in said stationary duct, and wherein the air removal flow rate is at a non-zero minimum value for low engine speed and is available, increasing with increasing engine speed up to a maximum air removal flow rate.
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14. A method of balancing pressure in at least one bearing enclosure of a turbojet, said enclosure being defined between a rotor mounted to rotate about an axis and a stator including a bearing support on which a bearing is mounted that bears against said rotor, said enclosure including a device for feeding said bearing with lubricating liquid, an air intake bringing into the enclosure pressurized air coming from a pressurization circuit, at least one sealing system placed between the stator and the rotor in front of and/or behind said bearing, a recovery system for recovering the lubricating liquid and a removal system for removing the air towards a venting circuit, the method comprising:
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regulating, as a function of engine speed, the air removal flow rate downstream from the bearing enclosure, in a duct of the venting circuit; and changing as a function of engine speed, the flow section of the duct between a minimum flow section that is not zero and a maximum flow, by which said air flow rate is variable as a function of the speed of the engine, non-zero, and, at high speeds, lower than when the flow rate of air is not regulated, and wherein said flow rate is regulated by a shut-off member mounted to move between a closed position in which said shut-off member occupies a large fraction of the section of the duct that then has a minimum flow section and an open position in which said shut-off member occupies a small fraction of the section of the duct that then has a maximum flow section, it being possible for said shut-off member to take up any intermediate position between said closed position and said open position, and wherein the air removal flow rate is at a non-zero minimum value for low engine speed and is variable, increasing with increasing engine speed up to a maximum air removal flow rate.
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Specification