Device for monitoring the sealing of a rotorcraft transmission box by suction
First Claim
1. A device for monitoring the sealing state of a casing housing lubricated moving members of a transmission box of a rotorcraft, the device comprising:
- an airflow circuit open to the atmosphere at its downstream end, the airflow circuit having leaktight coupling means at its upstream end for coupling in a leaktight manner to a vent of the casing, and being fitted with a suction generator member for generating suction inside the airflow circuit, operation of the suction generator member being under the control of control means;
regulator means for regulating the suction that is maintained stable inside the airflow circuit relative to a setpoint threshold (S), operation of the regulator means being controlled at least to depend on a pressure gauge for measuring the suction generated inside the airflow circuit; and
information generator means for generating information at least about the operation of the suction generator member by the regulator means.
2 Assignments
0 Petitions
Accused Products
Abstract
A device for monitoring the sealing state of a casing (2) of a transmission box (1) of a rotorcraft. An open airflow circuit (7) fitted with a suction generator member (10) is connected to a vent (5) of the casing (2). Regulator means (12) maintain stable suction in the airflow circuit (7) relative to a setpoint threshold (S), the regulator means being controlled in response to a pressure gauge (13) for measuring the suction generated inside the airflow circuit (7). The device is used on the ground to detect a source of leakage in the casing (2) and in flight to retain lubricant inside the casing (2) in the event of there being a source of leakage.
23 Citations
18 Claims
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1. A device for monitoring the sealing state of a casing housing lubricated moving members of a transmission box of a rotorcraft, the device comprising:
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an airflow circuit open to the atmosphere at its downstream end, the airflow circuit having leaktight coupling means at its upstream end for coupling in a leaktight manner to a vent of the casing, and being fitted with a suction generator member for generating suction inside the airflow circuit, operation of the suction generator member being under the control of control means; regulator means for regulating the suction that is maintained stable inside the airflow circuit relative to a setpoint threshold (S), operation of the regulator means being controlled at least to depend on a pressure gauge for measuring the suction generated inside the airflow circuit; and information generator means for generating information at least about the operation of the suction generator member by the regulator means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for monitoring the sealing state of a casing housing lubricated moving members of a transmission box of a rotorcraft, the method comprising:
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providing an airflow circuit having a downstream end open to the atmosphere and an upstream end having leaktight coupling means for coupling in a leaktight manner to a vent of the casing, the airflow circuit being fitted with a suction generator member for generating suction inside the airflow circuit; connecting the upstream end of the airflow circuit to the vent of the casing; generating suction inside the casing by operating the suction generator member under the control of regulator means, and using the regulator means to maintain the suction inside the casing relative to a setpoint threshold (S), operation of the regulator means being controlled at least to depend on a pressure gauge for measuring the suction generated inside the casing; monitoring the operation of the suction generator member by the regulator means, at least concerning a frequency with which the suction generator member is put into operation compared with a setpoint frequency with which the suction generator member would be put into operation based on there being no significant passage for outside air through the casing via a lubricant leakage source; in the event of a leakage source being detected on the basis of the monitoring operation, visually observing the casing while suction is maintained therein and identifying the location of at least one cause of leakage; and using information generator means to generate information at least about the operation of the suction generator member by the regulator means.
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16. A method of using a device for monitoring the sealing state of a casing housing lubricated moving members of a transmission box of a rotorcraft, wherein the device includes (i) an airflow circuit open to the atmosphere at its downstream end, the airflow circuit having leaktight coupling means at its upstream end for coupling in a leaktight manner to a vent of the casing, and being fitted with a suction generator member for generating suction inside the airflow circuit, operation of the suction generator member being under the control of control means, (ii) regulator means for regulating the suction that is maintained stable inside the airflow circuit relative to a setpoint threshold (S), operation of the regulator means being controlled at least to depend on a pressure gauge for measuring the suction generated inside the airflow circuit, and (iii) information generator means for generating information at least about the operation of the suction generator member by the regulator means, the method comprising:
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A) during a stage in which the transmission box is in operation, the device being installed on board the rotorcraft and being connected to the casing; generating suction inside the casing by operating the suction generator member under the control of the regulator means until reaching the setpoint threshold (S), and using the regulator means to maintain the suction inside the casing stable relative to the setpoint threshold (S); and collecting and storing a history of the data generated by the information generator means;
thenB) during a stage of maintaining the rotorcraft on the ground; playing back the history in transcribed form in order to enable an operator to detect a potential source of leakage by observing the data history; and
thenin the event of a leakage source being detected; generating suction inside the casing by operating the suction generator member under the control of the regulator means and using the regulator means to maintain the suction inside the casing stable relative to the setpoint threshold (S); and an operator visually observing the casing while suction is being maintained therein and identifying the location of at least one cause of leakage. - View Dependent Claims (17, 18)
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Specification