CN216846905U - High thrust high rotational speed axial force loading device - Google Patents

High thrust high rotational speed axial force loading device Download PDF

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Publication number
CN216846905U
CN216846905U CN202123082989.XU CN202123082989U CN216846905U CN 216846905 U CN216846905 U CN 216846905U CN 202123082989 U CN202123082989 U CN 202123082989U CN 216846905 U CN216846905 U CN 216846905U
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Prior art keywords
transmission shaft
axial force
tilting pad
thrust
thrust bearing
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CN202123082989.XU
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Inventor
盛贵宾
赵勇
杨佳彬
王奂钧
祁中宽
范一龙
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703th Research Institute of CSIC
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703th Research Institute of CSIC
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Abstract

The utility model belongs to the technical field of the aeronautical test ware, concretely relates to high rotational speed axial force loading device of high thrust. The utility model discloses an independent box, no axial positioning has automatic compensation axial displacement's function, provides the axial force and relies on tilting pad footstep bearing transmission axial force through two play pole pneumatic cylinders. The utility model can stably provide the axial force from zero to rated load by accurately controlling the oil supply pressure of the double-rod hydraulic cylinder, and has high loading precision and small load fluctuation range; radial force is applied to the transmission shaft through the double-rod hydraulic cylinder arranged above the box body, the supporting rigidity of the cylindrical roller bearing is increased, and when the transmission shaft rotates at a high speed and passes through a critical state, the size of the radial force is changed, so that the supporting rigidity of the cylindrical roller bearing is changed, the natural frequency of a shaft system is changed, and the function of frequency shift is achieved. The utility model has the characteristics of strong operability, rotational speed are high, thrust is big and the practicality is strong etc.

Description

High thrust high rotational speed axial force loading device
Technical Field
The utility model belongs to the technical field of the aeronautical test ware, concretely relates to high rotational speed axial force loading device of high thrust.
Background
The supports of the high-speed rotor of the aircraft engine are provided with elastic supports and squeeze film dampers, and GE90 and Genx engines adopt the design scheme, so that the aim of reducing vibration of the rotor passing through the critical rotating speed is fulfilled. However, with regard to squeeze film dampers, the performance of the damper cannot be accurately calculated according to design parameters, and a trial and error method related to experience, theory and experiment is required.
In order to effectively play the damping role of the squeeze film damper, the squeeze film damper and a rotor system need to be tested and verified together, and a proper squeeze film damper is matched. When the rotor system rotates at a high speed, the rotor blades of the gas compressor do work on air, so that the blades are subjected to the reaction force of airflow, and the direction of the force is axial. The bearing for bearing the axial force is a three-fulcrum ball bearing, and can stably work under the condition of the axial force. Therefore, during the test, an axial force loading device is required to be provided externally, and the axial force is transmitted to the three-fulcrum ball bearing of the rotor system through the coupler.
The aero-engine has high transmission power, high working rotating speed and large generated axial thrust, and the existing axial force loading mode cannot meet the requirement of the axial force.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high rotational speed axial force loading device of high thrust.
A high thrust and high rotation speed axial force loading device comprises a box body and a double-rod hydraulic cylinder; a box bushing is arranged on the box body, and a transmission shaft, a cylindrical roller bearing, a tilting pad thrust bearing and a thrust bearing seat are arranged in the box body; inner rings of the cylindrical roller bearings are arranged at two ends of the transmission shaft, and outer rings of the cylindrical roller bearings are arranged on the box body; the transmission shaft is supported by a cylindrical roller bearing, and a thrust disc is arranged in the middle of the transmission shaft; the tilting pad thrust bearing is sleeved on the transmission shaft, and a tilting pad on the end surface of the tilting pad thrust bearing is contacted with a thrust disc of the transmission shaft; the thrust bearing seat is sleeved on the tilting pad thrust bearing, and cylindrical pins are radially arranged on the thrust bearing seat and the tilting pad thrust bearing and used for preventing the thrust bearing seat and the tilting pad thrust bearing from rotating when axial force is transmitted; the double-rod hydraulic cylinders are arranged on the box body bushing, are uniformly distributed along the circumferential direction of the transmission shaft, and are used for applying axial force to the thrust bearing block and bearing the counter force of the axial force by the wall of the box body; and a double-rod hydraulic cylinder is arranged above the box body and is used for applying radial force to the thrust bearing block.
Furthermore, drum-shaped teeth are mounted at one end of the transmission shaft and used for compensating axial displacement after axial force is applied, a housing is arranged outside the drum-shaped teeth and mounted on a box body bushing, and an oil supply pipe and an oil return pipe for lubricating the drum-shaped teeth are arranged on the housing.
Furthermore, the plurality of double-rod hydraulic cylinders which are uniformly distributed along the circumferential direction of the transmission shaft are connected in parallel and share an oil inlet and an oil outlet, the oil supply pressure of each double-rod hydraulic cylinder is consistent during loading, the input force is kept consistent, and the tilting pad of the tilting pad thrust bearing is prevented from generating unbalance loading, so that the transmission shaft generates additional overturning moment; the double-rod hydraulic cylinder arranged above the box body is used for adjusting the supporting rigidity of the cylindrical roller bearing and changing the natural frequency of a shafting when the high rotating speed is over-critical.
Furthermore, the tilting pad thrust bearing consists of tilting pad blocks on the end face and four oil liquids in an inner hole; after the transmission shaft rotates, the tilting pad block contacts with a thrust disc of the transmission shaft to form a dynamic pressure oil film, and a shaft neck of the transmission shaft is matched with four oil liquids in an inner hole, so that the tilting pad thrust bearing moves on the transmission shaft in a self-moving manner without clamping stagnation, and the applied axial force is completely borne by the transmission shaft.
Furthermore, each extension rod head of the double-extension-rod hydraulic cylinder is provided with a force sensor for detecting an output force value, the oil supply pressure of the double-extension-rod hydraulic cylinder is controlled through a proportional servo valve, so that the axial force from zero to a rated load is stably provided, the loading precision is high, and the load fluctuation range is small.
The beneficial effects of the utility model reside in that:
the utility model discloses an independent box, no axial positioning has automatic compensation axial displacement's function, provides the axial force and relies on tilting pad footstep bearing transmission axial force through two play pole pneumatic cylinders. The utility model can stably provide the axial force from zero to rated load by accurately controlling the oil supply pressure of the double-rod hydraulic cylinder, and has high loading precision and small load fluctuation range; radial force is applied to the transmission shaft through the double-rod hydraulic cylinder arranged above the box body, the supporting rigidity of the cylindrical roller bearing is increased, and when the transmission shaft rotates at a high speed and passes through a critical state, the size of the radial force is changed, so that the supporting rigidity of the cylindrical roller bearing is changed, the natural frequency of a shaft system is changed, and the function of frequency shift is achieved. The utility model has the characteristics of strong operability, rotational speed are high, thrust is big and the practicality is strong etc.
Drawings
Fig. 1 is an overall schematic view of the present invention.
Fig. 2 is a schematic view of a middle tilting pad thrust bearing of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
Example 1:
a high thrust high rotational speed axial force loading device, including the container body and one pair of hydraulic cylinders 3 of the out-feed rod; a box body bushing 5 is installed on the box body, and a transmission shaft 2, a cylindrical roller bearing 4, a tilting pad thrust bearing 7 and a thrust bearing seat 8 are arranged in the box body; inner rings of the cylindrical roller bearings 4 are arranged at two ends of the transmission shaft 2, and outer rings of the cylindrical roller bearings 4 are arranged on the box body; the transmission shaft 2 is supported by a cylindrical roller bearing 4, and a thrust disc is arranged in the middle of the transmission shaft 2; the tilting pad thrust bearing 7 is sleeved on the transmission shaft 2, and a tilting pad on the end surface of the tilting pad thrust bearing is contacted with a thrust disc of the transmission shaft 2; the thrust bearing seat 8 is sleeved on the tilting pad thrust bearing 7, and cylindrical pins are arranged in the radial directions of the thrust bearing seat 8 and the tilting pad thrust bearing 7 and used for preventing the tilting pad thrust bearing from rotating when axial force is transmitted; the double-rod hydraulic cylinders 3 are arranged on the box body bushing 5, are uniformly distributed along the circumferential direction of the transmission shaft 2, and are used for applying axial force to the thrust bearing block 8 and bearing the counter force of the axial force by depending on the wall of the box body; and a double-rod hydraulic cylinder 3 is arranged above the box body and is used for applying radial force to the thrust bearing seat 8.
The utility model is an independent box body, the supporting bearings at the two ends of the axial force loading device select cylindrical roller bearings 4, the two ends are connected with an external coupler through flange structures, and the generated axial force is transmitted to a high-speed rotor by a coupler; therefore, the axial force loading device has no axial positioning, and has the function of automatically compensating axial displacement when transmitting the axial force. The axial force loading device mainly depends on the tilting pad thrust shaft 7 bearing to transmit axial force, and specific bearing parameters are determined by working conditions. The tilting pad thrust bearing 7 realizes large-tonnage axial force transmission by utilizing a dynamic pressure oil film formed between the tilting pad and the thrust disc, and can accurately adjust the axial loading force.
Example 2:
furthermore, a drum-shaped tooth 10 is installed at one end of the transmission shaft 2 and used for compensating axial displacement after axial force is applied, a housing 11 is installed outside the drum-shaped tooth 10, the housing 11 is installed on the box body bushing 5, and an oil supply pipe and an oil return pipe for lubricating the drum-shaped tooth are arranged on the housing 11.
Example 3:
the axial force in the utility model is provided by the double-rod hydraulic cylinder 3, the force sensor 6 is arranged at the head part of the rod, the oil supply pressure of the double-rod hydraulic cylinder 3 is controlled by the proportional servo valve, the axial force from zero to rated load can be stably provided, the loading precision is high, and the load fluctuation range is small; the double-rod hydraulic cylinders 3 which are uniformly distributed along the circumferential direction of the transmission shaft 2 are connected in parallel and share an oil inlet and an oil outlet, the oil supply pressure of each double-rod hydraulic cylinder 3 is consistent during loading, the input force is kept consistent, the tilting pad of the tilting pad thrust bearing 7 is prevented from generating unbalance loading, and the transmission shaft 2 does not generate additional tilting moment due to the application of axial force.
The utility model discloses in arrange two play pole pneumatic cylinders 3 above the box and be used for applying radial force to transmission shaft 2, increase cylindrical roller bearing 4's support rigidity, when transmission shaft 2 high-speed rotation is crossed the criticality, change the radial force size to change cylindrical roller bearing 4's support rigidity, and then change the natural frequency of shafting, have the function of shifting frequently. Meanwhile, the oil film of the sliding bearing has damping characteristics, so that shafting vibration can be absorbed.
Example 4:
furthermore, the tilting pad thrust bearing 7 consists of tilting pads on the end face and four oil liquids in an inner hole; after the transmission shaft 2 rotates, the tilting pad block contacts with a thrust disc of the transmission shaft 2 to form a dynamic pressure oil film, and a shaft neck of the transmission shaft 2 is matched with four oil liquids of an inner hole, so that the tilting pad thrust bearing 7 moves on the transmission shaft 2 in a self-moving manner without clamping stagnation, and the applied axial force is completely borne by the transmission shaft 2.
Example 5:
as shown in fig. 1, the axial force loading device of the present invention adopts an independent box design, and comprises a lower box 1 and an upper box, wherein a box bushing 5 is installed on the box, and a double-rod hydraulic cylinder 3 is installed on the bushing; the reaction force after the axial force is applied acts on the case liner 5 and is transmitted to the case through the case liner 5.
The supporting bearings at the two ends of the axial force loading device are cylindrical roller bearings 4, the two ends of the axial force loading device are connected with an external coupler through flange structures, and the generated axial force is transmitted to the high-speed rotor by virtue of the coupler; therefore, the axial force loading device has no axial positioning and needs to define an initial installation position during assembly. The displacement of the transmission shaft generated by the axial force is compensated by the drum-shaped teeth consisting of the cylindrical roller bearing 4, the drum-shaped teeth 10 and the internal teeth 12, so that the test accompanying equipment is prevented from generating the axial force. Meanwhile, the drum-shaped tooth also serves as one hinge point of the coupler to play a role in angular compensation.
The tilting pad thrust bearing 7 with an inner hole of a four-oil structure is sleeved on the transmission shaft 2, a large thrust is transmitted by a dynamic pressure oil film formed by the tilting pad, radial support of the bearing is provided by four oil, and an oil film is formed after the transmission shaft 2 rotates. Meanwhile, the tilting pad thrust bearing can move on the shaft in a self-moving manner without clamping stagnation, so that the applied axial force is completely born by the transmission shaft 2.
The double-rod hydraulic cylinders 3 are uniformly distributed on the periphery of the box body bushing, a plurality of hydraulic cylinders act on the thrust bearing seat 8 at the same time, and the hydraulic cylinders are connected in parallel and share one oil inlet and one oil outlet. During loading, the oil supply pressure of each hydraulic cylinder is consistent, the input force is kept consistent, and the tilting pads are prevented from generating unbalance loading, and the transmission shaft generates additional overturning moment. The hydraulic cylinder at the upper box body 9 is used for adjusting the supporting rigidity of the cylindrical roller bearing 4, and the natural frequency of a shaft system is changed when the high rotating speed is over-critical.
The utility model discloses axial force loading device's design process:
1. analyzing the working mechanism of the axial force loading device, and mastering the core technology of the design of the tilting pad thrust bearing with high linear speed;
2. by designing the structure of the axial force loading device, a cylindrical roller bearing, a transmission shaft with a thrust disc and a tilting pad thrust bearing which meet the requirements of power and rotating speed are determined; then the design of a loading bearing seat, a box body and a hydraulic cylinder is completed, and the integral structure is confirmed;
3. through the analysis of the device, the number of pads, the average specific pressure, the average linear velocity, the oil film thickness, the oil film temperature and the lubricating oil amount of the tilting pad thrust bearing under the working conditions of high power and high rotating speed are calculated, and the structure and the size of the tilting pad thrust bearing and the thrust pad thereof are determined;
4. and grinding a machine sample, carrying out a load test on the device, and verifying the high rotating speed capability and the axial force loading function of high thrust of the device.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (5)

1. The utility model provides a high rotational speed axial force loading device of high thrust which characterized in that: comprises a box body and a double-rod hydraulic cylinder (3); a box body bushing (5) is installed on the box body, and a transmission shaft (2), a cylindrical roller bearing (4), a tilting pad thrust bearing (7) and a thrust bearing seat (8) are arranged in the box body; the inner rings of the cylindrical roller bearings (4) are arranged at two ends of the transmission shaft (2), and the outer rings of the cylindrical roller bearings (4) are arranged on the box body; the transmission shaft (2) is supported by a cylindrical roller bearing (4), and a thrust disc is arranged in the middle of the transmission shaft (2); the tilting pad thrust bearing (7) is sleeved on the transmission shaft (2), and a tilting pad on the end surface of the tilting pad thrust bearing is contacted with a thrust disc of the transmission shaft (2); the thrust bearing seat (8) is sleeved on the tilting pad thrust bearing (7), and cylindrical pins are arranged in the radial directions of the thrust bearing seat (8) and the tilting pad thrust bearing (7) and used for preventing the axial force from being transmitted to rotate; the double-rod hydraulic cylinders (3) are arranged on the box body bushing (5), are uniformly distributed along the circumferential direction of the transmission shaft (2), and are used for applying axial force to the thrust bearing seat (8) and bearing the counter force of the axial force by means of the box body wall; and a double-rod hydraulic cylinder (3) is arranged above the box body and is used for applying radial force to the thrust bearing seat (8).
2. The high-thrust high-rotation-speed axial force loading device as claimed in claim 1, wherein: the transmission shaft is characterized in that a drum-shaped tooth (10) is installed at one end of the transmission shaft (2) and used for compensating axial displacement after axial force is applied, a housing (11) is arranged outside the drum-shaped tooth (10), the housing (11) is installed on the box body lining (5), and an oil supply pipe and an oil return pipe for lubricating the drum-shaped tooth are arranged on the housing (11).
3. The high-thrust high-rotation-speed axial force loading device as claimed in claim 1, wherein: the multiple double-rod hydraulic cylinders (3) which are uniformly distributed along the circumferential direction of the transmission shaft (2) are connected in parallel and share an oil inlet and an oil outlet, the oil supply pressure of each double-rod hydraulic cylinder (3) is consistent during loading, the input force is kept consistent, the tilting pad of the tilting pad thrust bearing (7) is prevented from generating unbalance loading, and the transmission shaft (2) does not generate additional tilting moment due to the application of axial force; the double-rod hydraulic cylinder (3) arranged above the box body is used for adjusting the supporting rigidity of the cylindrical roller bearing (4), and when the high rotating speed is over-critical, the natural frequency of a shaft system is changed.
4. The high-thrust high-rotation-speed axial force loading device as claimed in claim 1, wherein: the tilting pad thrust bearing (7) consists of tilting pad blocks on the end face and four oil liquids in an inner hole; after the transmission shaft (2) rotates, the tilting pad block contacts with a thrust disc of the transmission shaft (2) to form a dynamic pressure oil film, and a shaft neck of the transmission shaft (2) is matched with four oil liquids of an inner hole, so that the tilting pad thrust bearing (7) moves on the transmission shaft (2) in a self-moving way without clamping stagnation, and the applied axial force is completely born by the transmission shaft (2).
5. The high-thrust high-rotation-speed axial force loading device as claimed in claim 1, wherein: the force sensor (6) is installed at the head of each extending rod of the double-extending-rod hydraulic cylinder (3) and used for detecting an output force value, the oil supply pressure of the double-extending-rod hydraulic cylinder (3) is controlled through the proportional servo valve, so that the axial force from zero to a rated load is stably provided, the loading precision is high, and the load fluctuation range is small.
CN202123082989.XU 2021-12-09 2021-12-09 High thrust high rotational speed axial force loading device Active CN216846905U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202123082989.XU CN216846905U (en) 2021-12-09 2021-12-09 High thrust high rotational speed axial force loading device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202123082989.XU CN216846905U (en) 2021-12-09 2021-12-09 High thrust high rotational speed axial force loading device

Publications (1)

Publication Number Publication Date
CN216846905U true CN216846905U (en) 2022-06-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115824618A (en) * 2023-02-20 2023-03-21 西安航天动力研究所 Rotor axial force loading device and rotor testing system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115824618A (en) * 2023-02-20 2023-03-21 西安航天动力研究所 Rotor axial force loading device and rotor testing system
CN115824618B (en) * 2023-02-20 2023-07-14 西安航天动力研究所 Rotor axial force loading device and rotor testing system

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