Graphite seal oil leakage flow characteristics test device

Abstract

The present invention discloses a graphite seal lubricating oil leakage flow characteristic test device, comprising: a motor, a coupling, a rotor shaft, a rotor runway, an oil cylinder, a graphite sealing test section, an air cylinder and a bracket, wherein the output shaft of the motor is connected to the rotor shaft through the coupling, the rotor runway is cooperatively installed on the outer periphery of the rotor shaft, the oil cylinder, the graphite sealing test section and the air cylinder are sealed and connected in sequence and sleeved on the outer periphery of the rotor shaft, the graphite sealing test section and the rotor runway are correspondingly arranged to form a sealing gap, the two sides of the rotor runway form an oil cavity and an air cavity correspondingly, and the free ends of the oil cylinder and the air cylinder are sealed by an oil cavity sealing plate and an air cavity sealing plate respectively. The graphite seal lubricating oil leakage flow characteristic test device has a reasonable structure, can measure the critical sealing oil pressure of the graphite seal under different structural parameters and operating parameters, and can observe the flow state of the lubricating oil.

Description

Technical Field

[0001] The invention relates to the field of graphite seals, and in particular provides a graphite seal lubricating oil leakage flow characteristic test device. Background Art

[0002] With the extreme working environment of aircraft engines and the improvement of afterburner performance, the problem of graphite seal oil leakage in aircraft engines has become increasingly prominent, which will have a significant negative impact on the performance, life, safety, etc. of aircraft engines. At present, some engine bearing cavities seal the lubricating oil in the bearing cavity by introducing high-pressure gas after compressor supercharging, that is, the supercharged gas from the engine compressor is injected into the air cavity outside the bearing cavity. During normal operation of the engine, the supercharged air pressure is greater than the lubricating oil pressure, and the lubricating oil is sealed in the bearing cavity, so that the lubricating oil can flow inside the oil circuit without leakage. However, during the engine starting process, the increase rate of the oil supply pressure is faster than the introduced supercharged air pressure, resulting in the lubricating oil pressure being greater than the bleed air pressure in a short period of time. This phenomenon also occurs during the cold operation, start-up, and parking of the engine. At this time, the sealing pressure is insufficient, and the lubricating oil will flow from the sealed discharge port into the cavity of the rear turbine frame, and then flow out along the gap between the rear turbine frame and the flange of the tail nozzle. Therefore, oil dripping or a pool of lubricating oil will be seen at the tail nozzle of the engine.

[0003] In order to solve the problem of bearing cavity oil leakage, it is urgent to design a graphite seal lubricating oil leakage flow characteristics test device to facilitate the experimental study of graphite seal lubricating oil leakage characteristics and critical seal oil pressure. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a graphite seal lubricating oil leakage flow characteristics test device, so as to realize the experimental study on the graphite seal lubricating oil leakage characteristics and critical seal oil pressure.

[0005] The technical solution provided by the present invention is: a graphite seal lubricating oil leakage flow characteristics test device, comprising: a motor, a coupling, a rotor shaft, a rotor runway, an oil cylinder, a graphite seal test section, an air cylinder and a bracket, wherein the output shaft of the motor is connected to the rotor shaft through the coupling, the rotor runway is cooperatively installed on the outer periphery of the rotor shaft, the oil cylinder, the graphite seal test section and the air cylinder are sealed and connected in sequence and sleeved on the outer periphery of the rotor shaft through the bracket, the graphite seal test section and the rotor runway are correspondingly arranged to form a sealing gap, the two sides of the rotor runway form an oil cavity and an air cavity correspondingly, the oil cylinder and The free ends of the air cylinder are sealed by an oil chamber sealing plate and an air chamber sealing plate respectively; the oil chamber sealing plate is provided with an oil injection pipe connected with the oil chamber; the oil cylinder is provided with a vent, an oil outlet, an oil cylinder window, a first temperature sensor and a first pressure sensor; the first temperature sensor and the first pressure sensor are respectively used to monitor the temperature and pressure in the oil chamber; the air chamber sealing plate is provided with an air inlet connected with the air chamber; the air cylinder is provided with an air cylinder window, a second temperature sensor, a second pressure sensor and an exhaust hole; the second temperature sensor and the second pressure sensor are respectively used to monitor the temperature and pressure in the air chamber.

[0006] Preferably, the rotor runway is mounted on the rotor shaft via a keyway structure.

[0007] Further preferably, the oil chamber sealing plate, oil cylinder, graphite sealing test section, air cylinder and air chamber sealing plate are connected in sequence through flanges.

[0008] Further preferably, a support seat cooperating with the rotor shaft is provided in the air cylinder.

[0009] Further preferably, the oil injection pipes are evenly arranged along the circumference of the oil chamber sealing plate.

[0010] Further preferably, the air inlets are evenly arranged along the circumference of the air cavity sealing plate.

[0011] The graphite seal lubricating oil leakage flow characteristic test device provided by the present invention has a reasonable structure, can measure the critical sealing oil pressure of the graphite seal under different structural parameters and operating parameters, and can observe the flow state of the lubricating oil, wherein the rotation speed of the rotor shaft can be adjusted by the motor to simulate different rotation speeds of the rotor, the pressure sensor and the temperature sensor can monitor the pressure and temperature of the oil cavity and the air cavity in real time, the graphite seal test section and the rotor runway can be adjusted as needed, thereby changing the structure of the graphite seal test section, the structure of the rotor runway and the sealing gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments:

[0013] Figure 1A schematic diagram of the structure of a graphite seal lubricating oil leakage flow characteristics test device provided by the present invention;

[0014] Figure 2 A cross-sectional view of a graphite seal lubricating oil leakage flow characteristics test device provided by the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further explained below in conjunction with specific implementation schemes, but the present invention is not limited thereto.

[0016] In order to test and measure the critical seal oil pressure of graphite seal under different structural parameters and working conditions and observe the flow state of lubricating oil, such as Figure 1 , Figure 2 As shown, the present invention provides a graphite seal lubricating oil leakage flow characteristics test device, including: a motor 1, a coupling 2, a rotor shaft 3, a rotor runway 4, an oil cylinder 5, a graphite seal test section 6, an air cylinder 7 and a bracket 8, wherein the output shaft of the motor 1 is connected to the rotor shaft 3 through the coupling 2, the rotor runway 4 is cooperatively installed on the outer periphery of the rotor shaft 3, the oil cylinder 5, the graphite seal test section 6 and the air cylinder 7 are sealed and connected in sequence and sleeved on the outer periphery of the rotor shaft 3 through the bracket 8, the graphite seal test section 6 and the rotor runway 4 are correspondingly arranged to form a sealing gap, the two sides of the rotor runway 4 form an oil cavity and an air cavity correspondingly, and the free ends of the oil cylinder 5 and the air cylinder 7 are respectively connected through the oil cavity sealing plate 9 and the air cavity sealing plate 9. The cavity sealing plate 10 is sealed, the oil cavity sealing plate 9 is provided with an oil injection pipe 91 connected with the oil cavity, the oil cylinder 5 is provided with a vent 51, an oil outlet 52, an oil cylinder window 53, a first temperature sensor (not shown in the figure) and a first pressure sensor (not shown in the figure), the first temperature sensor and the first pressure sensor are respectively used to monitor the temperature and pressure in the oil cavity, the air cavity sealing plate 10 is provided with an air inlet 101 connected with the air cavity, the air cylinder 7 is provided with an air cylinder window 71, a second temperature sensor (not shown in the figure), a second pressure sensor (not shown in the figure) and an exhaust hole (not shown in the figure), the second temperature sensor and the second pressure sensor are respectively used to monitor the temperature and pressure in the air cavity.

[0017] The graphite seal lubricating oil leakage flow characteristic test device has a reasonable structure, can measure the critical sealing oil pressure of the graphite seal under different structural parameters and operating parameters, and can observe the flow state of the lubricating oil. The rotation speed of the rotor shaft can be adjusted by the motor to simulate different rotation speeds of the rotor. The pressure sensor and the temperature sensor can monitor the pressure and temperature of the oil cavity and the air cavity in real time. The graphite seal test section and the rotor runway can be adjusted as needed to change the structure of the graphite seal test section, the structure of the rotor runway and the sealing gap.

[0018] The method for measuring the critical sealing oil pressure of graphite seals and observing the flow state of lubricating oil by using the graphite seal lubricating oil leakage flow characteristics test device is as follows: first, high-pressure gas is introduced into the air cavity through the air inlet to form a high-pressure environment in the air cavity, and then oil is sprayed into the oil cavity through the oil injection pipe to the required lubricating oil level, and the motor is turned on to drive the rotor shaft and the rotor runway to rotate. After the rotor runway speed reaches the working condition required for the test, it is operated for a period of time under high speed and high sealing pressure conditions to ensure that there is no lubricating oil leakage in the sealing cavity; next, the air cavity pressure is controlled to gradually decrease, and the lubricating oil leakage is observed through the window. When lubricating oil leakage occurs, the air cavity pressure is stabilized to ensure that the lubricating oil no longer flows into the air cavity. At this time, the pressure monitored by the second pressure sensor and the pressure monitored by the first pressure sensor are the critical sealing oil pressure under the working condition parameters and structural parameters.

[0019] To facilitate the replacement of the rotor runway, as an improvement in the technical solution, the rotor runway 4 is installed on the rotor shaft 3 through a keyway structure. When the rotor runway needs to be replaced for different runway structures and sizes, the entire shaft does not need to be replaced, which can reduce experimental costs.

[0020] As an improvement of the technical solution, Figure 1 As shown, the oil chamber sealing plate 9, the oil cylinder 5, the graphite sealing test section 6, the gas cylinder 7 and the gas chamber sealing plate 10 are connected in sequence through flanges.

[0021] As an improvement of the technical solution, Figure 2 As shown, a support seat 72 cooperating with the rotor shaft 3 is provided in the air cylinder 7 for supporting the rotor shaft.

[0022] As an improvement of the technical solution, the oil injection pipes 91 are evenly arranged along the circumference of the oil chamber sealing plate 9 .

[0023] As an improvement of the technical solution, the air inlets 101 are evenly arranged along the circumference of the air cavity sealing plate 10 .

[0024] The detailed description of the present invention is written in a progressive manner, emphasizing the differences between the various implementations, and similar parts thereof can be referred to each other.

[0025] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A graphite seal lubricating oil leakage flow characteristics test device, characterized in that: include: A motor (1), a coupling (2), a rotor shaft (3), a rotor track (4), an oil cylinder (5), a graphite sealing test section (6), an air cylinder (7) and a bracket (8), wherein the output shaft of the motor (1) is connected to the rotor shaft (3) via the coupling (2), the rotor track (4) is cooperatively mounted on the outer periphery of the rotor shaft (3), and the oil cylinder (5), the graphite sealing test section (6) and the air cylinder (7) are sealed and connected in sequence and sleeved on the rotor shaft via the bracket (8). The outer periphery of the sub-shaft (3), the graphite sealing test section (6) and the rotor raceway (4) are arranged correspondingly to form a sealing gap, the two sides of the rotor raceway (4) form an oil cavity and an air cavity, the free ends of the oil cylinder (5) and the air cylinder (7) are respectively sealed by an oil cavity sealing plate (9) and an air cavity sealing plate (10), the oil cavity sealing plate (9) is provided with an oil injection pipe (91) connected to the oil cavity, the oil cylinder (5) is provided with a vent (51), an oil outlet (52), and an oil cylinder viewing window (53), a first temperature sensor and a first pressure sensor, the first temperature sensor and the first pressure sensor are respectively used to monitor the temperature and pressure in the oil cavity, the air cavity sealing plate (10) is provided with an air inlet (101) connected to the air cavity, the air cylinder (7) is provided with an air cylinder window (71), a second temperature sensor, a second pressure sensor and an exhaust hole, the second temperature sensor and the second pressure sensor are respectively used to monitor the temperature and pressure in the air cavity, the rotor runway (4) is mounted on the rotor shaft (3) through a keyway structure, the oil cavity sealing plate (9), the oil cylinder (5), the graphite sealing test section (6), the air cylinder (7) and the air cavity sealing plate (10) are connected in sequence through a flange plate, the air cylinder (7) is provided with a support seat (72) matched with the rotor shaft (3), the oil injection pipe (91) is evenly arranged along the circumference of the oil cavity sealing plate (9), and the air inlet (101) is evenly arranged along the circumference of the air cavity sealing plate (10).

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