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Mechanical sealing device for magnetofluid lubricating and adaptive sealing control method

A mechanical sealing device, sealing device technology, applied in the direction of engine sealing, mechanical equipment, engine components, etc.

Active Publication Date: 2015-03-04
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of self-adaptive system in magnetic fluid lubricated mechanical seal has not been published at home and abroad.

Method used

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  • Mechanical sealing device for magnetofluid lubricating and adaptive sealing control method
  • Mechanical sealing device for magnetofluid lubricating and adaptive sealing control method
  • Mechanical sealing device for magnetofluid lubricating and adaptive sealing control method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] 1. The structure of ferrofluid lubricated non-contact mechanical seal

[0085] The structure of the magnetic fluid lubricated mechanical seal device of the present invention is as attached figure 1 shown.

[0086]The magnetohydrodynamic lubrication mechanical seal device of the present invention includes a programmable controller 18, a rotating shaft 12, a sealing chamber 11 installed on the rotating shaft 12, a moving ring seat 3 and a static ring seat 7, and the sealing chamber 11 Set on one side of the rotating shaft 12, the outside of the sealed cavity 11 is provided with a static ring seat 7 and a moving ring seat 3, a static ring 5 is installed on the static ring seat 7, a moving ring 4 is installed on the moving ring seat 3, and a moving ring 4 Cooperate with one end face of static ring 5.

[0087] An axial drainage hole is arranged in the static ring 5, and one end of the drainage hole is led to the mating end faces of the dynamic and static rings, and the ot...

Embodiment 2

[0110] Self-adaptive sealing control method of the present invention

[0111] When the mechanical seal is in normal working condition, the pressure of the liquid film seal is equivalent to the pressure of the sealed medium, so that the sealed medium will not leak from the end faces of the sealing ring. Due to changes in operating parameters (pressure of the sealed medium and rotational speed of the rotating shaft), the pressure of the liquid film seal is not equal to the pressure of the sealed medium. At this time, the mechanical seal cannot maintain normal working condition.

[0112] Ferrofluid viscosity changes with changes in magnetic field strength. When the magnetic field strength increases, the viscosity of the ferrofluid increases correspondingly, and vice versa, the viscosity of the ferrofluid decreases. When the viscosity of the ferrofluid increases, the pressure of the fluid film increases; otherwise, the pressure of the ferrofluid film decreases. According to thi...

Embodiment 3

[0161] Step 1, start the program and set parameters;

[0162] 1 Turn on the computer and start the program.

[0163] 2 Manual control, turn on the equipment operation switch. The switch of the electromagnetic valve is manually controlled by the computer, so that a stable ferrofluid liquid film is generated in the sealing ring, so that the sealing structure is in a normal operating state.

[0164] 3Set the parameters.

[0165] The parameters set include:

[0166] ① Input the resistance R of the copper wire in the magnetic field generator = 0.02176Ω, and the proportional coefficient K = 18638 between the magnetic field strength in the sealed gap and the current in the magnetic field generator coil.

[0167] ②Input ferrofluid carrier fluid viscosity η c =1.1×10 -3 Pa·s (with kerosene as the base fluid), the average length of the dispersant chain molecules in the ferrofluid δ=8.6×10 -9 m, the radius r of the solid-phase magnetic particle p =5×10 -9 m, the mass component of...

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Abstract

The invention discloses a mechanical sealing device for magnetofluid lubricating and an adaptive sealing control method, and belongs to the technical field of sealing. The mechanical seal is characterized by comprising a movable ring and a fixed ring, wherein a micron-level deep spiral groove is formed in one end face of the movable ring, and the fixed ring is matched with the movable ring. Under a working state, magnetofluid is injected between the end faces of the movable ring and the fixed ring through a through hole, which is close to the outer diameter, of the fixed ring; under the action of the spiral groove, the magnetofluid flows to the inner diameter direction from the outer diameter of a sealing end face, and a hydrodynamic effect is generated; pressure on a magnetofluid film is increased, and the two end faces are pushed away, so that lubrication on the fluid on the end faces is realized. An adaptive sealing property control system judges whether the sealing property of the mechanical seal meets the requirement by comparing the pressure of a liquid film with the pressure of a sealed medium; if the rotating speed of the movable ring or the pressure of the sealed medium is changed, the system can adjust the voltage of a magnetic field generator according to a preset strategy to adjust the pressure of the liquid film and correspondingly adjust the input flow of ferrofluid, so that the sealing effect of the mechanical seal is guaranteed.

Description

Technical field: [0001] The invention relates to a non-contact mechanical seal. Ferrofluid is used as the lubricating medium of mechanical seal friction pair, and the viscosity of the ferrofluid lubricating film can be controlled by adjusting the strength of the external magnetic field according to the change of operating parameters, so that the dynamic pressure effect of the ferrofluid film can adapt to the pressure of the sealed medium and the shaft change in rotational speed. It belongs to the field of sealing technology. Background technique: [0002] The scale, automation, intelligence, and integration of modern industrial equipment are constantly improving. Many rotary kinematic pairs are working at high temperature, high pressure, and high speed, and leakage problems are common. Mechanical seal is the most common type of fluid dynamic seal and is an important part of rotating equipment to prevent leakage. Integration, light weight, high precision, high stability, h...

Claims

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Application Information

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IPC IPC(8): F16J15/43
CPCF16J15/43
Inventor 周剑锋赵海龙汪宇徐天成邵春雷顾伯勤吕中尧王莹张梦园
Owner NANJING UNIV OF TECH
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