A high-speed hydraulic dynamometer

Abstract

The invention discloses a novel high-speed hydraulic dynamometer, comprising a base and an outer shell. A weight static calibration device, a force measuring device and a speed measuring device are connected to the outer shell by screws. A left outer shell and a right outer shell are fixed in the outer shell by fixing bolts. A cavity is formed in the left outer shell, the right outer shell and the outer shell. The cavity is connected with a flexible inlet and outlet pipe through an inlet and outlet elbow pipe. A main shaft is fixed in the right outer shell and the left outer shell through left and right high-speed bearings respectively. A high-speed floating carbon ring seal and a bushing are respectively arranged in the left and right outer shells to form a sealing pair. A water sealing pair is arranged on the inner side of the oil-water sealing ring in the left and right outer shells. The high-speed hydraulic dynamometer of the invention has high-speed operation capability and meets the direct test of aircraft engine power output. The structure is compact, the main shaft rigidity meets the high-speed operation and has strong vibration resistance. The main shaft optical disc structure as a power absorbing element has a long life characteristic with strong cavitation resistance capability. The multi-layer series high-speed sealing structure has reliable oil and water sealing performance.

Description

Technical Field

[0001] The invention relates to the field of aviation engine testing, and in particular to a high-speed hydraulic dynamometer. Background Art

[0002] With the independent research and development of domestic aircraft engines, it is necessary to carry out various tests such as product performance development, calibration, matching, simulation, reliability and durability, and to conduct simulated engine power performance tests on aircraft engines on the test bench through power loading devices. Due to the advantages of low unit cost, compact size, small inertia, fast transient response, large load absorption, and high-power operation, hydraulic dynamometers have always been important equipment for measuring and diagnosing engine power performance. However, traditional hydraulic dynamometers are restricted by factors such as high-speed cavitation, high-speed centrifugal force, high-speed bearing matching, bearing lubrication, and sealing, and cannot meet the testing needs of gas turbine engines for the aviation industry. There is a lack of a high-speed hydraulic dynamometer that does not require a complex transmission chain or reduction gearbox to directly act on the power output of the aircraft engine. Summary of the invention

[0003] The object of the present invention is to provide a high-speed hydraulic dynamometer.

[0004] The technical solution adopted by the present invention is:

[0005] A high-speed hydraulic dynamometer, characterized in that it includes a machine base and a shell, the shell is connected with a weight static calibration device, a force measuring device, and a speed measuring device by screws, the shell is connected with a water inlet actuator and a water discharge actuator by flexible water inlet and water discharge pipes, a left shell and a right shell are fixed in the shell by fixing bolts, a cavity is formed in the left shell, the right shell, and the shell, and the cavity is connected with the flexible water inlet and water discharge pipes by water inlet and water discharge elbows, a main shaft is fixed in the right shell and the left shell by left and right high-speed bearings, the inner sides of the left and right high-speed bearings on the main shaft are respectively provided with oil slingers, and the inner sides of the left and right oil slingers are respectively provided with oil slingers. A bushing is provided, and a high-speed floating carbon ring seal and a bushing are respectively arranged in the left and right outer shells to form a sealing pair, a water sealing seal pair is provided on the inner side of the oil-water sealing ring in the left and right outer shells, and a shaft sleeve with a left and right high-speed floating carbon ring seal is respectively provided on the outer side of the left and right high-speed bearings on the main shaft, and a splicing cap is provided on the outer side of the shaft sleeve, a swing bearing is provided between the end of the left and right outer shells and the machine base, the left and right outer shells are provided with end covers, and the main shaft extending out of the end cover is provided with a coupling, a water inlet disk and a guide ring are arranged in the outer shell, and a plurality of conical optical disks are provided on the main shaft, the water inlet disk and the guide ring are staggered, and the guide ring passes through the conical optical disk and is fixed in the outer shell.

[0006] The water inlet tray and the guide ring are fixed in a cavity formed by a left outer shell, a right outer shell and an outer shell connected by bolts.

[0007] The high-speed floating carbon ring seal consists of a seat and a shaft sleeve. The seat is provided with an oil injection hole and a sealing vent hole. The shaft sleeve is provided with a labyrinth ring with a tortuous path. The oil injection hole is connected to an external oil supply system through an oil channel on the housing.

[0008] The force measuring device measures the dynamometer torque, and the speed measuring device measures the spindle speed. The power can be calculated by multiplying the speed and torque.

[0009] The water sealing pair is fixedly installed in the housing and is provided with a vent hole and a labyrinth sealing ring to prevent water in the dynamometer from leaking to the bearing side.

[0010] The oil slinger is installed on the main shaft and rotates at high speed with the main shaft. The oil slinger is designed to have a conical surface to prevent the lubricating oil from flowing into the dynamometer water chamber.

[0011] The oil-water sealing ring is installed in the housing, and the air film sealing belt formed between the oil-water sealing ring and the bushing isolates the oil and water.

[0012] The advantages of the present invention are as follows: the high-speed hydraulic dynamometer has the ability to run at high speed, which meets the direct test of aircraft engine power output and is an essential test equipment that truly reflects the technical performance of the engine. It has a compact structure and a spindle rigidity that meets the high-speed operation and strong vibration resistance. The spindle disc structure, as a power absorption element, has a strong anti-cavitation ability and a long life, which meets the requirements of durability assessment tests. The multi-layer series high-speed sealing structure has reliable oil and water sealing performance, ensuring a reliable and stable operation test environment without pollution. Unlike traditional pit-type hydraulic dynamometers, it does not require frequent replacement of power components and has strong economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] Figure 1 It is a structural schematic diagram of the present invention;

[0015] Figure 2 It is a side view of the present invention.

[0016] Among them: 1. Weight static calibration device; 2. Machine base; 3. Water inlet actuator; 4. Housing; 5. Main shaft; 6. Drain actuator; 7. Force measuring device; 8. Coupling; 9. Swing bearing; 10. Cap; 11. High-speed floating carbon ring seal; 12. High-speed bearing; 13. Water inlet plate; 14. Guide ring; 15. Water sealing pair; 16. End cover; 17. Oil throwing ring; 18. Oil-water sealing ring; 19. Bushing; 20. Right housing; 21. Flexible inlet and outlet pipes; 22. Inlet and outlet elbow pipes; 23. Left housing; 24. Fixing bolts; 25. Bolts; 26. Speed ​​measuring device; 27. Conical optical disc. DETAILED DESCRIPTION

[0017] like Figure 1-2As shown, a high-speed hydraulic dynamometer includes a base 2 and a housing 4. The housing 4 is connected with a weight static calibration device 1, a force measuring device 7, and a speed measuring device 26 by screws. The housing 4 is connected with a water inlet actuator 3 and a water discharge actuator 6 by a flexible water inlet and outlet pipe 21. A left housing 23 and a right housing 20 are fixed in the housing 4 by fixing bolts 24. A cavity is formed in the left housing 23, the right housing 20, and the housing 4. The cavity is connected with the flexible water inlet and outlet pipe 21 by a water inlet and outlet elbow 22. A main shaft 5 is fixed in the right housing 20 and the left housing 23 by left and right high-speed bearings 12, respectively. The inner sides of the left and right high-speed bearings 12 on the main shaft 5 are respectively provided with oil slingers 17, and the inner sides of the left and right oil slingers 17 are respectively provided with bushings 19, a high-speed floating carbon ring seal 11 and a bushing 19 are respectively arranged in the left and right outer shells to form a sealing pair, a water sealing pair 15 is arranged on the inner side of the oil-water sealing ring 18 in the left and right outer shells, and a shaft sleeve of the left and right high-speed floating carbon ring seal 11 is respectively arranged on the outer side of the left and right high-speed bearings 12 on the main shaft 5, and a cap 10 is arranged on the outer side of the shaft sleeve, a swing bearing 9 is arranged between the end of the left outer shell 23 and the right outer shell 20 and the base 2, and the left and right outer shells are provided with end covers 16, and the main shaft 5 extends out of the end cover 16 and is provided with a coupling 8, a water inlet disc 13 and a guide ring 14 are arranged in the outer shell, and a plurality of conical optical discs 27 are arranged on the main shaft 5, and the water inlet disc 13 and the guide ring 14 are staggered, and the guide ring 14 passes through the conical optical disc 27 and is fixed in the outer shell 4.

[0018] The water inlet tray 13 and the guide ring 14 are fixed in a cavity formed by the left outer shell 23, the right outer shell 20 and the outer shell 4 connected by bolts.

[0019] The high-speed floating carbon ring seal 11 is composed of a seat and a shaft sleeve. The seat is provided with an oil injection hole and a sealing vent hole. A labyrinth ring with a maze path is provided on the shaft sleeve. The oil injection hole is connected to an external oil supply system through an oil passage on the housing 4.

[0020] The force measuring device 7 measures the dynamometer torque, and the speed measuring device 26 measures the spindle speed. The power can be calculated by multiplying the speed and torque.

[0021] The water sealing pair 15 is fixedly installed in the housing 4 and is provided with a vent hole and a labyrinth sealing ring to prevent water in the dynamometer from leaking to the bearing side.

[0022] The oil slinger 17 is mounted on the main shaft 5 and rotates at high speed with the main shaft 5. The oil slinger is designed to have a conical surface to prevent the lubricating oil from flowing into the dynamometer water chamber.

[0023] The oil-water sealing ring 18 is installed in the housing 4, and the air film sealing zone formed between the oil-water sealing ring 18 and the bushing 19 isolates the oil and water.

[0024] The high-speed hydraulic dynamometer of the present invention has the ability to run at high speed, which meets the direct test of aircraft engine power output and is an essential test equipment that truly reflects the technical performance of the engine. It has a compact structure and a spindle rigidity that meets the high-speed operation and has strong vibration resistance. The spindle disc structure, as a power absorption element, has a strong anti-cavitation ability and a long life, which meets the requirements of durability assessment tests. The multi-layer series high-speed sealing structure has reliable oil and water sealing performance, ensuring a reliable and stable operation test environment without pollution. Unlike traditional pit-type hydraulic dynamometers, it does not require frequent replacement of power components and has strong economy.

Claims

1. A high-speed hydraulic dynamometer, characterized in that: It includes a machine base and a shell. A weight static calibration device, a force measuring device and a speed measuring device are connected to the shell by screws. The shell is connected to a water inlet actuator and a water discharge actuator by flexible water inlet and water discharge pipes. A left shell and a right shell are fixed in the shell by fixing bolts. A cavity is formed in the left shell, the right shell and the shell. The cavity is connected to the flexible water inlet and water discharge pipes by water inlet and water discharge elbows. A main shaft is fixed to the right shell and the left shell by left and right high-speed bearings respectively. An oil slinger is provided on the inner side of the left and right high-speed bearings on the main shaft respectively. A bushing is provided on the inner side of the left and right oil slinger. A high-speed floating carbon ring seal and a bushing are respectively arranged in the shell to form a sealing pair, a water sealing pair is arranged on the inner side of the oil-water sealing ring in the left and right outer shells, and a shaft sleeve with a left and right high-speed floating carbon ring seal is respectively arranged on the outer side of the left and right high-speed bearings on the main shaft, and a splicing cap is arranged on the outer side of the shaft sleeve, a swing bearing is arranged between the end of the left and right outer shells and the machine base, the left and right outer shells are provided with end covers, and a coupling is arranged on the main shaft extending out of the end cover, a water inlet disk and a guide ring are arranged in the outer shell, and a plurality of conical optical disks are arranged on the main shaft, the water inlet disk and the guide ring are staggered, and the guide ring passes through the conical optical disk and is fixed in the outer shell.

2. A high-speed hydraulic dynamometer according to claim 1, characterized in that: The water inlet tray and the guide ring are fixed in a cavity formed by a left outer shell, a right outer shell and an outer shell connected by bolts.

3. A high-speed hydraulic dynamometer according to claim 1, characterized in that: The high-speed floating carbon ring seal consists of a seat and a shaft sleeve. The seat is provided with an oil injection hole and a sealing vent hole. The shaft sleeve is provided with a labyrinth ring with a tortuous path. The oil injection hole is connected to an external oil supply system through an oil channel on the housing.

4. A high-speed hydraulic dynamometer according to claim 1, characterized in that: The force measuring device measures the dynamometer torque, and the speed measuring device measures the spindle speed. The power can be calculated by multiplying the speed and torque.

5. A high-speed hydraulic dynamometer according to claim 1, characterized in that: The water sealing pair is fixedly installed in the housing and is provided with a vent hole and a labyrinth sealing ring to prevent water in the dynamometer from leaking to the bearing side.

6. A high-speed hydraulic dynamometer according to claim 1, characterized in that: The oil slinger is installed on the main shaft and rotates at high speed with the main shaft. The oil slinger is designed to have a conical surface to prevent the lubricating oil from flowing into the dynamometer water chamber.

7. A high-speed hydraulic dynamometer according to claim 1, characterized in that: The oil-water sealing ring is installed in the housing, and the air film sealing belt formed between the oil-water sealing ring and the bushing isolates the oil and water.

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