An electric drive lubricating oil accessory system

Abstract

The present invention provides an electrically driven lubricating oil accessory system, belonging to the field of aircraft engine technology, and comprising an oil supply pump, a front chamber oil return pump, a rear chamber oil return pump, an accessory oil return pump, an oil pump transmission gear, an oil-gas separator, a centrifugal ventilator, a motor, an altitude valve, and an oil pump drive shaft. By designing a drive motor drive shaft and an oil pump drive shaft, the system uses a single motor to drive the oil supply pump, oil return pump, oil-gas separator, centrifugal ventilator, and other oil system accessories. Consequently, only one motor is required. From a control perspective, only a single motor is required, simplifying the control algorithm and control system. From a structural perspective, the system saves the weight of multiple motors and supporting cables. Furthermore, the system integrates the existing oil system ventilation ductwork with the motor drive system, saving weight.

Description

Technical Field

[0001] The present invention belongs to the technical field of aviation engines, and in particular relates to an electric drive lubricating oil accessory system. Background Art

[0002] Traditional aircraft engines include major systems such as transmission systems and lubricating oil systems. The related power-driven accessories of the lubricating oil system, such as the lubricating oil pump assembly, centrifugal ventilator, and oil-gas separator, are mainly installed on the accessory casing, which extracts the engine main shaft power for driving.

[0003] At present, aircraft engines are developing in the direction of multi-electric or all-electric. One of the most important signs is the cancellation of the traditional transmission system and its replacement with electric drive. The lubricating oil accessories of the lubricating oil system, one of the important systems of the engine, will also be directly driven by the motor.

[0004] There are few descriptions of electric lubricating oil systems abroad. However, the electric lubricating oil system scheme released by the Central Research Institute of Aviation Engines in Russia uses separate motors to drive the oil supply pump, front bearing cavity return oil pump, rear bearing cavity return oil pump, oil-gas separator, and centrifugal ventilator. Domestic engine research institutes and universities are also largely basing their electric lubricating oil system designs on this approach. This configuration allows for independent control of each accessory, achieving optimal performance for each. However, the large number of drive motors and the resulting weight make the control system complex, making it difficult to meet the practical application requirements of electric lubricating oil systems in aircraft engines. Summary of the Invention

[0005] The purpose of the present invention is to solve the above technical problems and provide an electric drive lubricating oil system driven by a single motor to solve the problem of heavy weight of the electric drive lubricating oil system accessories and its drive system.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: an electric drive lubricating oil accessory system, comprising an oil supply pump, a front chamber oil return pump, a rear chamber oil return pump, an accessory oil return pump, a lubricating oil pump transmission gear, an oil-gas separator, a centrifugal ventilator, a motor, a high altitude valve, and a lubricating oil pump transmission shaft.

[0007] The motor includes a motor transmission shaft extending out of the motor, and the motor transmission shaft is internally engaged with the splines of the oil-gas separator and the centrifugal ventilator to drive the rotation of the oil-gas separator and the centrifugal ventilator.

[0008] The motor drive shaft drives the oil pump drive shaft to rotate through the oil pump drive gear.

[0009] The lubricating oil pump drive shaft drives the inner and outer rotors of the oil supply pump, the front cavity oil return pump, the rear cavity oil return pump and the accessory oil return pump to rotate.

[0010] The motor transmission shaft is a hollow shaft, and the axial air path of the hollow shaft is connected to the lubricating oil pump transmission gear and the high-altitude valve.

[0011] The electric drive lubricating oil accessory system provided by the present invention also has the following technical features: the motor drive shaft is provided with a first spline that forms an internal meshing with the spline on the oil-gas separator rotor and a second spline that forms an internal meshing with the spline on the centrifugal fan rotor.

[0012] The electric drive lubricating oil accessory system provided by the present invention also has the following technical features: a first opening is provided at the connection between the motor drive shaft and the oil-gas separator; after the oil-gas separator separates the oil and gas in the return oil, the gas portion enters the motor drive shaft through the first opening.

[0013] The electric drive lubricating oil accessory system provided by the present invention also has the following technical features: a second opening and a third opening are provided at the connection between the motor drive shaft and the centrifugal ventilator; the gas in the motor drive shaft flows out from the second opening and enters the centrifugal ventilator for separation of tiny oil particles; and the gas after separation of tiny oil particles returns to the motor drive shaft through the third opening and leads to the high-altitude valve.

[0014] The electric drive lubricating oil accessory system provided by the present invention also has such a technical feature that a transmission gear for meshing with the lubricating oil pump transmission gear is provided at the end of the motor transmission shaft.

[0015] The electric-driven lubricating oil accessory system provided by the present invention also has such a technical feature that the lubricating oil pump drive shaft is provided with a plurality of flat keys respectively connected to the inner rotor of the oil supply pump, the front chamber return oil pump, the rear chamber return oil pump and the accessory return oil pump.

[0016] The electric drive lubricating oil accessory system provided by the present invention also has the following technical features: the oil-gas separator is a centrifugal oil-gas separator, and the centrifugal ventilator is a pressurized centrifugal ventilator.

[0017] The electric drive lubricating oil accessory system provided by the present invention also has the following technical feature: the motor is a permanent magnet synchronous motor.

[0018] The electric-drive lubricating oil accessory system provided by the present invention also has the following technical features: the high-altitude valve includes a bellows-type diaphragm valve and a spring valve.

[0019] Beneficial effects:

[0020] The electric-driven lubricating oil accessory system provided in the present application is designed to drive the motor drive shaft and the lubricating oil pump drive shaft, and uses one motor to drive the rotation of lubricating oil system accessories such as the oil supply pump, oil return pump, oil-gas separator, and centrifugal ventilator. Therefore, only one motor is required. From a control perspective, only a single motor needs to be controlled, and the control algorithm and control system are relatively simple; from a structural perspective, the weight of multiple motors and supporting cables is saved; in addition, this solution integrates the ventilation ducts of the existing lubricating oil system with the motor transmission system, saving the weight of the ventilation ducts. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] Figure 1 This is a structural diagram of the electric drive lubricating oil accessory system provided by an embodiment of the present invention.

[0023] Among them, 1: oil supply pump; 2: front cavity oil return pump; 3: rear cavity oil return pump; 4: accessory oil return pump; 5: lubricating oil pump drive gear; 6: oil-gas separator; 7: centrifugal ventilator; 8: motor; 9: high altitude valve; 10: motor drive shaft; 11: lubricating oil pump drive shaft; 12: first spline; 13: second spline; A: oil supply pump lubricating oil inlet, B: oil supply pump lubricating oil outlet, C: front cavity oil return pump lubricating oil inlet, D: front cavity oil return pump lubricating oil outlet, E: rear cavity oil return pump lubricating oil inlet, F: rear cavity oil return pump lubricating oil outlet, G: accessory oil return pump lubricating oil inlet, H: accessory oil return pump lubricating oil outlet, I: oil-gas separator lubricating oil inlet, J: oil-gas separator lubricating oil outlet, K: centrifugal ventilator lubricating oil outlet, L: motor lubricating oil inlet, M: motor lubricating oil outlet, N: high altitude valve air outlet. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in this field based on these embodiments are within the scope of protection of the present invention.

[0025] Furthermore, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0026] The terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0027] like Figure 1 As shown, an embodiment of the present invention provides an electric drive lubricating oil accessory system, including an oil supply pump 1, a front cavity oil return pump 2, a rear cavity oil return pump 3, an accessory oil return pump 4, a lubricating oil pump transmission gear 5, an oil-gas separator 6, a centrifugal ventilator 7, a motor 8, a high altitude valve 9 and a lubricating oil pump transmission shaft 11.

[0028] The motor 8 includes a motor transmission shaft 10 extending out of the motor 8 , and the motor transmission shaft 10 is internally engaged with the splines of the oil-gas separator 6 and the centrifugal ventilator 7 to drive the rotation of the oil-gas separator 6 and the centrifugal ventilator 7.

[0029] The motor transmission shaft 10 drives the lubricating oil pump transmission shaft 11 to rotate through the lubricating oil pump transmission gear 5.

[0030] The lubricating oil pump drive shaft 11 drives the inner and outer rotors of the oil supply pump 1, the front chamber oil return pump 2, the rear chamber oil return pump 3 and the accessory oil return pump 4 to rotate.

[0031] The motor transmission shaft 10 is a hollow shaft, and the axial air path of the hollow shaft is connected to the lubricating oil pump transmission gear 5 and the high-altitude valve 9.

[0032] In some embodiments, the motor drive shaft 10 is provided with a first spline 12 that forms an internal meshing with the spline on the rotor of the oil-gas separator 6 and a second spline 13 that forms an internal meshing with the spline on the rotor of the centrifugal ventilator 7 .

[0033] In some embodiments, a first opening is provided at the connection between the motor drive shaft 10 and the oil-gas separator 6 . After the oil-gas separator 6 separates the oil and gas in the return oil, the gas portion enters the motor drive shaft 10 through the first opening.

[0034] In some embodiments, a second opening and a third opening are provided at the connection between the motor drive shaft 10 and the centrifugal ventilator 7. The gas in the motor drive shaft 10 flows out from the second opening and enters the centrifugal ventilator 7 for separation of fine oil particles. After the separation of fine oil particles, the gas returns to the motor drive shaft 10 through the third opening and leads to the high-altitude valve 9.

[0035] In some embodiments, a transmission gear for meshing with the lubricating oil pump transmission gear 5 is provided at the end of the motor transmission shaft 10 .

[0036] In some embodiments, the lubricating oil pump drive shaft 11 is provided with a plurality of flat keys respectively connected to the inner rotors of the oil supply pump 1 , the front chamber oil return pump 2 , the rear chamber oil return pump 3 and the accessory oil return pump 4 .

[0037] In some embodiments, the oil-gas separator 6 is a centrifugal oil-gas separator, and the centrifugal ventilator 7 is a pressurized centrifugal ventilator.

[0038] In some embodiments, the motor 8 is a permanent magnet synchronous motor.

[0039] In some embodiments, the high-altitude valve 9 includes a bellows-type diaphragm valve and a spring valve.

[0040] The working process of the electric drive lubricating oil accessory system provided in the above embodiment is as follows:

[0041] When the lubricating oil system is operating, lubricating oil enters oil supply pump 1 from oil supply pump oil inlet A. Through oil supply pump oil outlet B, oil supply pump 1 supplies lubricating oil to the front and rear bearing cavities, as well as motor 8. The oil flows into the motor through motor oil inlet L, lubricating and cooling the motor before exiting motor 8 through motor oil outlet M. The forward chamber return pump 2, rear chamber return pump 3, and accessory return pump 4 then withdraw the oil through oil supply pump oil inlet A, forward chamber return pump oil inlet C, rear chamber return pump oil inlet E, and accessory return pump oil inlet G, respectively. The oil then flows through forward chamber return pump oil outlet D, rear chamber return pump oil outlet F, and accessory return pump oil outlet H, where it is then combined and supplied to the oil-gas separator oil inlet I. After the lubricating oil enters the oil-gas separator 6, it separates the oil and gas in the return oil. The separated oil flows out through the oil-gas separator oil outlet J and is recovered by the accessory return oil pump 4. The remaining oil and gas are led to the centrifugal ventilator 7 through the hollow motor drive shaft 10. The centrifugal ventilator 7 separates the oil and gas. The separated oil flows out through the centrifugal ventilator oil outlet K and is recovered by the accessory return oil pump 4. The remaining gas is led to the high-altitude valve 9 through the hollow motor drive shaft 10 and discharged into the atmosphere through the high-altitude valve air outlet N on the high-altitude valve 9.

[0042] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An electric drive lubricating oil accessory system, characterized in that: Including oil supply pump, front cavity oil return pump, rear cavity oil return pump, accessory oil return pump, lubricating oil pump transmission gear, oil-gas separator, centrifugal ventilator, motor, high altitude valve and lubricating oil pump transmission shaft, The motor includes a motor transmission shaft extending out of the motor, and the motor transmission shaft is internally engaged with the splines of the oil-gas separator and the centrifugal ventilator to drive the rotation of the oil-gas separator and the centrifugal ventilator. The motor drive shaft drives the oil pump drive shaft to rotate through the oil pump drive gear. The lubricating oil pump drive shaft drives the inner and outer rotors of the oil supply pump, the front cavity oil return pump, the rear cavity oil return pump and the accessory oil return pump to rotate. The motor transmission shaft is a hollow shaft, and the axial air path of the hollow shaft is connected to the lubricating oil pump transmission gear and the high-altitude valve.

2. The electric drive lubricating oil accessory system according to claim 1, characterized in that: The motor drive shaft is provided with a first spline that forms an internal meshing with the spline on the oil-gas separator rotor and a second spline that forms an internal meshing with the spline on the centrifugal ventilator rotor.

3. The electric drive lubricating oil accessory system according to claim 1, characterized in that: A first opening is provided at the connection between the motor drive shaft and the oil-gas separator. After the oil-gas separator separates the oil and gas in the return oil, the gas portion enters the motor drive shaft through the first opening.

4. The electric drive lubricating oil accessory system according to claim 1, characterized in that: A second opening and a third opening are provided at the connection between the motor drive shaft and the centrifugal ventilator. The gas in the motor drive shaft flows out from the second opening and enters the centrifugal ventilator for separation of tiny oil particles. After separation of tiny oil particles, the gas returns to the motor drive shaft through the third opening and leads to the high-altitude valve.

5. The electric drive lubricating oil accessory system according to claim 1, characterized in that: A transmission gear is provided at the end of the motor transmission shaft for meshing with the lubricating oil pump transmission gear.

6. The electric drive lubricating oil accessory system according to claim 1, characterized in that: The lubricating oil pump drive shaft is provided with a plurality of flat keys respectively connected to the inner rotors of the oil supply pump, the front cavity oil return pump, the rear cavity oil return pump and the accessory oil return pump.

7. The electric drive lubricating oil accessory system according to claim 1, characterized in that: The oil-gas separator is a centrifugal oil-gas separator, and the centrifugal ventilator is a pressurized centrifugal ventilator.

8. The electric drive lubricating oil accessory system according to claim 1, characterized in that: The motor is a permanent magnet synchronous motor.

9. The electric drive lubricating oil accessory system according to claim 1, characterized in that: The high-altitude valve includes a bellows-type diaphragm valve and a spring valve.

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