Magnetic fluid lubricated mechanical seal device and self-adaptive seal control method
A mechanical seal device, the technology of the seal device, applied in the direction of the engine seal, mechanical equipment, engine components, etc.
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Embodiment 1
[0084] 1. The structure of ferrofluid lubricated non-contact mechanical seal
[0085] The structure of the ferrofluid lubricated non-contact mechanical seal of the present invention is as attached figure 1 shown.
[0086]The magnetic fluid lubricated non-contact 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 The body 11 is arranged on one side of the rotating shaft 12, and the outer side of the sealed cavity 11 is provided with a static ring seat 7 and a moving ring seat 3. The static ring seat 7 is equipped with a static ring 5, and the moving ring seat 3 is equipped with a moving ring 4. The ring 4 is matched with one end face of the 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 dy...
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
[0162] Step 1, start the program and set parameters;
[0163] 1 Turn on the computer and start the program.
[0164] 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.
[0165] 3Set the parameters.
[0166] The parameters set include:
[0167] 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.
[0168] 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 particles p =5×10 -9 m, the mass component o...
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