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Spherical liquid dynamic pressure bearing floating measuring method

A technology of hydrodynamic pressure and measurement method, which is applied in the direction of mechanical bearing testing, etc. It can solve the problems of invisible floating state of dynamic pressure bearing and direct measurement of capacitance, etc., and achieve good monitoring effect and accurate detection effect

Inactive Publication Date: 2016-07-06
RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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Problems solved by technology

But for high-speed rotating machinery, the floating state of its dynamic pressure bearing is invisible. When the dynamic pressure bearing floats, the ball bearing and the bearing socket form a capacitor, but due to the high-speed operation of the ball bearing, this capacitor cannot be directly Measurement

Method used

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  • Spherical liquid dynamic pressure bearing floating measuring method
  • Spherical liquid dynamic pressure bearing floating measuring method
  • Spherical liquid dynamic pressure bearing floating measuring method

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Embodiment

[0065] Measure the relevant dimensions of rotor 1, housing 3, bearing 4 and bearing socket 5, design and measure the size of floating ring 2, and the outer diameter of rotor 1 155mm, measure the inner diameter of the floating ring 2 is 156mm, the height L of the floating ring 2 is 75mm, and the outer diameter of the floating ring 2 is measured is 161mm, the inner diameter of shell 3 170mm, vacuum absolute permittivity for , the relative dielectric constant of the medium is PTFE 2.55, air is 1, lubricating oil is 2.4, the relative area of ​​ball bearing 4 and bearing socket 5 is 4.87×10 -5 m 2 , the distance d between the ball bearing 4 and the bearing socket 5 is m.

[0066] but

[0067]

[0068]

[0069]

[0070] Total capacitance C when not floating

[0071]

[0072] Total capacitance C' when floating

[0073]

[0074] Capacitance change

[0075]

[0076] This result is an estimate and does not take into account stray capacitance.

[007...

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Abstract

The invention discloses a spherical liquid dynamic pressure bearing floating measuring method. The method comprises the following steps of: designing a floating measuring ring according to an interval between a rotor and a housing; according to the rotor, the floating measuring ring and the housing, estimating capacitance C when a dynamic pressure bearing does not float and capacitance C' when the dynamic pressure bearing floats, and calculating a change [delta]C; according to the magnitudes of capacitance C1, C2, C3, C4, C and C', selecting a capacitance measuring device with a suitable range; and in a high-speed rotating mechanical starting process, using the capacitance measuring device to measure the capacitance, and if the capacitance sudden change [delta]C from the non-floating process to the floating process is detected, then indicating that the dynamic pressure bearing normally floats. According to the invention, the floating measuring ring is utilized to complete the conversion of the tested capacitance from immeasurable to measurable, the monitoring on the operation state of the spherical liquid dynamic pressure bearing is realized, the floating state of the spherical liquid dynamic pressure bearing is accurately detected, and the monitoring effect is good.

Description

technical field [0001] The invention belongs to a method for measuring the running state, in particular to a method for measuring the floating of a spherical hydrodynamic pressure bearing. Background technique [0002] The hydrodynamic bearing is a sliding bearing that separates the two friction surfaces and bears the load by the liquid film formed by the dynamic pressure of the liquid lubricant. The liquid lubricant is brought between the two friction surfaces by the relative movement of the two friction surfaces. After machining, the two friction surfaces are microscopically uneven. In a hydrodynamic bearing in normal operation, the microscopic peaks on the two surfaces at the minimum oil film thickness are also not in contact, so there is no wear on the two surfaces. At this time, the friction is completely internal friction of oil, and the friction coefficient can be as small as 0.001. The lower the viscosity of the oil, the smaller the coefficient of friction, but th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/04
CPCG01M13/04
Inventor 高亚男魏强马常松郝书君于春萌
Owner RES INST OF PHYSICAL & CHEM ENG OF NUCLEAR IND
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