Test device and test method for fatigue life of bearing with ultra-low temperature and high DN value

A test device and fatigue life technology, applied in the direction of mechanical bearing testing, etc., can solve the problems of turbine pump damage, high test cost, inability to assess the impact of bearing life, etc., to provide damping effect, high reliability, and reduce vibration. Effect

Pending Publication Date: 2019-07-05
北京宇航推进科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The current bearing fatigue life test generally uses the direct assembly of the engine to directly test the bearing. Although the bearing can be assessed more accurately, once the bearing failure occurs, the turbo pump will be damaged, and the test cost will be high.
The normal temperature test is adopted, and the cooling medium of the bearing is a no

Method used

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  • Test device and test method for fatigue life of bearing with ultra-low temperature and high DN value
  • Test device and test method for fatigue life of bearing with ultra-low temperature and high DN value
  • Test device and test method for fatigue life of bearing with ultra-low temperature and high DN value

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Embodiment 1

[0044] as attached figure 1 , 2 As shown, the embodiment of the present invention provides a test device for the fatigue life of ultra-low temperature and high DN value bearings. The test device consists of an axial flexible loading device 25, a radial flexible loading device 24, a device housing 1, a test rotor 23 and The cup seal assembly is composed.

[0045] Since the test device is assembled and centered at normal temperature, the entire test device will shrink under the low temperature medium environment, that is, the center height of the test device will settle. The driving parts that drive the test device to rotate will thermally expand as the speed increases, and the thermal expansion and settlement values ​​are different under different speeds and vibration levels. The occurrence of misalignment will impose a dynamic load on the test device, resulting in a decrease in the reliability of the test device. In order to reduce the dynamic load of the test device as muc...

Embodiment 2

[0050] as attached Figure 3-5 As shown, the embodiment of the present invention provides a test device for the fatigue life of ultra-low temperature and high DN value bearings. The axial piston 30, the O-ring 31 and the axial piston barrel 32 together form an axially loaded cylinder. The axially loaded cylinder generates thrust under the action of compressed air, which is transmitted to the axial adapter block 35 through the axial force sensor 33, and the outer layer of the axial adapter block 35 is wrapped with a heating belt to protect the axial force sensor 33 in a normal temperature environment , Pt100 thermal resistance one 34 is used to monitor the temperature of the axial adapter block 35 in real time. The axial transfer block 35 transmits the axial force to the dowel rod 36, and the dowel rod 36 is in point-to-surface contact with the transition push rod 37 to adjust the axial force. The axial force is finally transmitted to the axial bellows sealing assembly 40, and...

Embodiment 3

[0052] as attached Image 6 , 7 As shown, the embodiment of the present invention provides a test device for fatigue life of ultra-low temperature and high DN value bearings. The radial piston 44 and the radial piston barrel 45 form a radially loaded cylinder. The radial loading cylinder generates a pulling force on the radial force sensor, and the sensor transmits the pulling force to the radial transfer block 49, and the outer layer of the radial transfer block 49 is wrapped with a heating tape to protect the radial force sensor 47 in a normal temperature environment, Pt100 thermal The second resistor 48 is used to monitor the temperature of the radial adapter block 49 in real time. The radial adapter block 49 and the tie rod joint 50 are threadedly connected to transmit the pulling force. The pull rod joint 50 transmits the pulling force to the radial pull rod 52 through the radial pin 51, and the radial bellows sealing assembly 9 plays the role of sealing and displacemen...

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Abstract

The invention discloses a test device and a test method for fatigue life of a bearing with ultra-low temperature and a high DN value. The test device comprises a device housing, wherein the device housing is connected with an axial flexible loading device and a radial flexible loading device; the axial flexible loading device and the radial flexible loading device are connected with a test rotor respectively; the test rotor comprises a main shaft; a tested bearing, a supporting process bearing, two loading process bearings and a shaft sleeve are installed on the main shaft; the main shaft andend covers are sealed by means of rubber cup sealing pieces; a force transmission sleeve having a through hole is installed between the axial flexible loading device and the radial flexible loading device; and a tested bearing outer sleeve and a front pressing cover fix a tested bearing outer ring through threaded connection, the tested bearing outer sleeve is connected with a front intermediate sleeve, and the front intermediate sleeve is connected with a front positioning cover. The test device and the test method realize the simulation of actual operating conditions of a low-temperature bearing in a turbopump of a low-temperature liquid rocket engine, including the ambient temperature, load, rotational speed and cooling flow rate being consistent or approximated to the actual operatingconditions.

Description

[0001] Technical field: [0002] The invention relates to a test device and test method for the fatigue life of ultra-low temperature and high DN value bearings. [0003] Background technique: [0004] Ultra-low temperature and high DN value bearings are key components of cryogenic liquid rocket engines, not only because of their high technical content in design and difficulty in development, but more importantly, more than 50% of the faults in low temperature liquid rocket engine tests are caused by turbo pumps. Quality is closely related to engine reliability. The speed is the most important design parameter of the turbo pump. The theoretical efficiency of the turbo pump increases with the increase of the speed, and the weight of the turbo pump decreases accordingly. The increase in speed is firstly restricted by the technical level of the bearing. The DN value of the bearing (shaft diameter x rotational speed, unit mm.r / min) is the main indicator of the technical level of t...

Claims

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Application Information

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IPC IPC(8): G01M13/04
CPCG01M13/04
Inventor 连军伟张茂森李鸿彪贺雷李文鹏
Owner 北京宇航推进科技有限公司
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