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An Accurate Measuring System of Magnetic Fluid Radial Sealing Torque

A technology of radial sealing and magnetic liquid, which is applied in the field of measurement systems, can solve problems such as the inability to study the rheological characteristics of the magnetic liquid seal gap

Active Publication Date: 2022-03-25
BEIJING JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional commercial rotational rheometers have high torque measurement and control accuracy, but the measurement system used can only be used for several specific theoretical models to measure the characteristics of the material itself, and it is impossible to study the magnetic liquid in the sealing gap in the actual application process. Rheological properties
The patent with the publication number CN108679234A discloses a patent for a rotational rheometer measurement system suitable for the rheological properties of magnetic liquids. This patent is very similar to the actual sealing structure, but uses permanent magnets as the magnetic source to limit the magnetic field between the sealing gaps. The size and the radial distribution of the pole teeth limit the type of seal and can only be applied to the research on the rheological properties of magnetic liquids in several specific seal gaps

Method used

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  • An Accurate Measuring System of Magnetic Fluid Radial Sealing Torque
  • An Accurate Measuring System of Magnetic Fluid Radial Sealing Torque
  • An Accurate Measuring System of Magnetic Fluid Radial Sealing Torque

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] Powering the rheometer electromagnet module 1, use the type of rotation 6, such as figure 2 Indicated. A certain amount of magnetic liquid is dripped onto the central platform of the rheometer electromagnet module 1, and the rheometer rotating shaft 9 is controlled to move down to the designated position, and the bottom electromagnet module 1 center platform of the rotation shaft 6 is kept certain. The sealing gap is in the action of the magnetic field, and the magnetic liquid flows to the central platform of the rheometer electromagnet module and the bottom of the shaft bottom to form a sealing chamber, at which time the sealing chamber is the interior space of the shaft and the blank ring. . By passing through the via holes, a quantity gas is accessed or extracted to form a certain pressure difference in the sealing chamber, and the rheometer rotating shaft rotates and measures the torque acts on the shaft on the shaft. By changing the sealing gap of the bottom electromag...

Embodiment approach 2

[0030] Powering the rheometer electromagnet module 1, use the type two-rotating shaft 6, such as Figure 4 Indicated. A certain amount of magnetic liquid is added dropwise to the center hole position of the outer casing 5, and the control rheometer rotating shaft 9 moves down to the designated position, and the bottom of the rotary shaft 6 maintains a certain gap in the center platform of the rheometer electromagnet module 1, and the action of the magnetic field Next, the magnetic liquid flows to the radial electrode teeth from the rotating shaft 6 and the gap of the outer casing 5, and the sealing cavity is the internal, rotating shaft and the internal space of the measuring system. By passing through the via holes, a quantity gas is accessed or extracted to form a certain pressure difference in the sealing chamber, and the rheometer rotating shaft rotates and measures the torque acts on the shaft on the shaft. By changing the fluid-made electromagnet module 1 power supply current...

Embodiment approach 3

[0032] Powering the rheometer electromagnet module 1, use the type three-axis 6, such as Image 6 Indicated. A certain amount of magnetic liquid is added dropwise onto the central platform of the rheometer electromagnet module 1 and the housing 5 center hole position, and the control rheometer rotating shaft 9 moves down to the designated position, the bottom of the rotary 6 and the rheometer electromagnet module 1 The central platform maintains a certain sealing gap, and under the action of the magnetic field, the magnetic liquid flows to the radial electrode tooth and the gap of the outer casing 5, thus forming a sealing chamber, and the sealing cavity is the internal space of the measuring system. A quantity gas is inserted or extracted in the sealing chamber, so that the sealing chamber forms a certain pressure difference, and the control rheometer rotates to rotate and measure the torque actuated on the shaft. By changing the fluid-made electromagnet module 1 power supply curr...

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PUM

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Abstract

The invention discloses an accurate measurement system for magnetic liquid radial sealing torque, which comprises a rheometer electromagnet module, a base, a top wire, an inner hexagonal bolt, a casing, a rotating shaft, a static ring of an air slip ring through a hole, and an air slip ring through a hole Moving ring, rheometer shaft, rigid coupling, gas nozzle, air pipe. A magnetic circuit is formed among the electromagnet module, casing and rotating shaft of the rheometer. By changing the power supply current of the electromagnet, the adjustment of the magnetic field size can be realized. Compared with the traditional magnetic liquid seal structure, the structure of the present invention is more simplified and compact. Through the replacement of the rotating shaft, not only the research on the rheological characteristics of single-tooth or multi-tooth pole pieces can be realized, but also the test and research on the magnetic liquid end face seal and radial seal can be realized. . The starting torque of magnetic liquid seal can be studied in depth by rotational rheometer.

Description

Technical field [0001] The present invention relates to the field of measurement system, and in particular, to a magnetic liquid radial sealing torque accurate measurement system. Background technique [0002] Magnetic liquid sealing is widely used in chemical, medical, military, aerospace, etc. due to its advantages of zero leakage, high reliability, low viscosity friction. For some high-efficient equipment, there is a strict requirement for the launching moment of the magnetic liquid seal, and the initiation of magnetic liquid sealing involves a series of complex material rheology behavior, which urgently needs the torque change and rheology during its startup. Research. [0003] The traditional commercial rotary rheometer has high torque measurement and control accuracy, but the measurement system adopted can only be used in several specific theoretical models, and the material itself is measured, and the magnetic liquid cannot be studied in the sealing gap in the actual appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L3/02G01N11/00F16J15/43
CPCG01L3/02G01N11/00F16J15/43G01N2011/006
Inventor 董珈皓李德才李振坤
Owner BEIJING JIAOTONG UNIV