Mechanical seal with controllable wave seal face seal ring

Abstract

The invention relates to a mechanical seal device for an end face seal ring with controllable bellows seal. The mechanical seal device is provided with a moving ring and a non-rotating stationary ring, wherein the moving ring can synchronously rotate along with a rotating shaft, and the stationary ring is connected with a stationary ring base; the axial relative end faces of the moving ring and the stationary ring are the respective seal faces, and at least one seal face is in a plane structure. Electric heating structures keeping the distance with the seal faces are arranged in the circumferential direction of the stationary ring and / or the moving ring with the plane-structure seal surface at intervals, and the electric heating structures are connected with a control system. On the basis that the conventional end face bellows process is kept, the mechanical seal device can process the seal faces into high-precision planes and can obtain the high surface quality on the planes and the controllable bellows seal faces through heating control for the electric heating structures, therefore the influences on the seal effects caused by various factors can be effectively eliminated and avoided, the good hydrodynamic effect can be generated, and the ideal fluid film opening force and stiffness are obtained.

Description

technical field [0001] The invention relates to an end face seal device, in particular to a mechanical seal device with a controllable wave seal end face seal ring. Background technique [0002] Mechanical sealing devices and technologies are widely used in the application of numerous rotating machinery axial end face seals, such as the shaft end seals of various types of pumps, compressors, expanders, separators, reactors and other rotating machines. Such as figure 1 As shown, the basic structure of the fluid end face non-contact mechanical seal device that has been reported and / or used at present usually includes a stationary ring (static ring) 1, a rotating ring (moving ring) 2, a static ring seat 3, a shaft Cover 4, drive pin 5, tolerance ring 7, compression sleeve 8, push ring 9, spring 10, anti-rotation pin 11 etc. constitute components. The static ring 1 and the moving ring 2 are arranged coaxially opposite each other, and their opposite end surfaces are sealing sur...

AI Technical Summary

Problems solved by technology

Considering that when the medium flows through the end face, sufficient hydrodynamic pressure effect can be formed to obtain greater opening force and rigidity of the fluid film. The wave amplitude on the end face of this type of mechanical seal is generally only a few microns to tens of microns, and there is a wave surface The surface quality (mainly referring to surface roughness, waviness, and shape) of the sealing end face is very high, which makes it difficult to obtain a high-precision wave surface with general processing techniques and equipment

On the other hand, when the processing accuracy can be effectively guaranteed, the size of the wave shape of the sealing end face may change due to factors such as detection means, assembly accuracy, and the influence of medium pressure and temperature during work.

This makes it difficult for the surface waveform of the wave surface mechanical seal to be consistent with the design waveform during actual operation, thus affecting the stability of the sealing work

[0005] Therefore, for mechanical seals with wave end faces, when the wave amplitude of the end face is very small and the surface quality requirements are very high, any link during processing, testing, assembly and operation may have a significant impact on the size and shape of the wave. Influence, resulting in the inability to produce sufficient end-face hydrodynamic effect, and it is difficult to obtain sufficient opening force and stiffness of the end-face fluid film, so that the seal cannot work normally

[0006] In summary, as an effective non-contact mechanical seal device, the wave surface mechanical seal has two significant problems: one is that the processing of the surface wave is difficult and the process requirements are very high; the other is that the surface wave in actual work It is difficult to keep consistent with the design waveform and cannot be adjusted

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