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Upstream pumping mechanical seal ring having elliptical grooves

A mechanical seal, elliptical technology, applied in the direction of engine seals, mechanical equipment, engine components, etc., can solve problems such as easy leakage, poor sealing effect, etc., to prolong the life of the seal, facilitate design and production, and uniform pressure distribution Effect

Pending Publication Date: 2020-03-27
温州市天成密封件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The end face hydrodynamic pressure groove of the upstream pumping mechanical seal is to transport the sealed medium leaked from the high-pressure side to the low-pressure side to the high-pressure side, or pump the buffer fluid on the low-pressure side to the high-pressure sealed medium side in a small amount. It belongs to the pump-out non-contact sealing structure, while the dry gas seal belongs to the pump-in non-contact sealing structure, the sealing effect is not good, and it is easy to leak

Method used

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  • Upstream pumping mechanical seal ring having elliptical grooves
  • Upstream pumping mechanical seal ring having elliptical grooves
  • Upstream pumping mechanical seal ring having elliptical grooves

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The present invention provides an upstream pumping mechanical seal ring with an oval groove, such as figure 1 and figure 2 As shown, the sealing ring includes a moving ring and a static ring, the moving ring and the static ring are provided with a sealing end face 1, and at least one sealing end face 1 of the moving ring and the static ring is provided with a plurality of elliptical fluids uniformly distributed along the circumferential direction The dynamic pressure groove 2, the fluid dynamic pressure groove 2 includes notches ab, upstream surface ac and backflow surface bc connected in sequence. The notch ab is set on the low-pressure side A of the sealing end face 1, that is, the inner side of the sealing end face 1 in the figure; The direction of rotation of the moving ring is opposite.

[0031] Specifically, in the figure: ab is the notch; ac is the upstream surface; bc is the backflow surface; A is the low pressure side; B is the high pressure side; L1 is the ...

Embodiment 2

[0035] This embodiment is an embodiment improved on the basis of the first embodiment. Such as image 3 and 4As shown, the upstream pumping mechanical seal ring with an elliptical groove in this embodiment is also provided with an annular pressure equalizing groove 3 on the sealing end face 1, and the annular pressure equalizing groove 3 is arranged on the side of the fluid dynamic pressure groove 2 away from the notch. On one side, the annular pressure equalizing groove 3 runs through and communicates with a plurality of fluid dynamic pressure grooves 2 . The groove depth of the annular pressure equalizing groove 3 is 1-50 μm, and the groove depth of the annular pressure equalizing groove 3 is equal to or smaller than that of the fluid dynamic pressure groove 2 . The radial width of the annular pressure equalizing groove 3 is 0.5-3 mm. The annular pressure equalizing groove 3 connects each fluid dynamic pressure groove 2 at the root of the groove, so that the pressure dist...

Embodiment 3

[0037] This embodiment is also an embodiment improved on the basis of the first embodiment. Such as Figure 5 and 6 As shown, the upstream pumping mechanical seal ring with an elliptical groove in this embodiment is also provided with an annular grit chamber 4 on the end face, and the annular grit chamber 4 is arranged at a certain position in the middle of the hydrodynamic pressure groove 2. The annular grit chamber 4 runs through and communicates with a plurality of fluid dynamic pressure grooves 2 . The depth of the annular grit chamber 4 is 20 μm to 3 mm, and the depth of the annular grit chamber 4 is greater than or equal to the depth of the hydrodynamic pressure chamber 2 . The radial width of the annular grit chamber 4 is 0.5-3mm. The annular grit chamber 4 can accommodate particles in the fluid, preventing the particles from damaging the sealing end face 1 of the sealing ring.

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Abstract

The invention discloses an upstream pumping mechanical seal ring having elliptical grooves. The upstream pumping mechanical seal ring relates to the technical field of mechanical sealing structures. The upstream pumping mechanical seal ring comprises a movable ring and a static ring, wherein sealing end surfaces are arranged on the movable ring and the static ring; a plurality of fluid dynamic pressure grooves evenly distributed in the circumferential direction of the sealing end surface are evenly formed in the sealing end surface of the movable ring and / or the sealing end surface of the static ring, planes of the fluid dynamic pressure grooves are positioned on a virtual ellipse, and each fluid dynamic pressure groove comprises a groove opening, an incident flow surface and a back flow surface which are sequentially connected; the groove openings are formed in the low-pressure side of the sealing end surfaces, a virtual circle where the groove openings are positioned coincides with avirtual circle where the low-pressure side edges of the sealing end surfaces are positioned, and the incident flow surfaces and the back flow surfaces are positioned on the virtual ellipse; and an inclination angle of the virtual ellipse where the planes of the fluid dynamic pressure grooves are positioned ranges from 50 to 82 degrees, and a ratio of the long axis to the short axis is 3-15: 1. The upstream pumping mechanical seal ring having elliptical grooves disclosed by the invention has the advantages of zero leakage in operation, low power consumption, low abrasion and long service life.

Description

technical field [0001] The invention relates to the technical field of mechanical seal structures, in particular to an upstream pumping mechanical seal ring with an elliptical groove. Background technique [0002] The upstream pumping mechanical seal is a new type of mechanical seal. It pumps the low-pressure side fluid into the seal end face by opening a fluid dynamic pressure groove on the seal end face. On the one hand, it can form a liquid film between the seal end faces to make the seal The end faces are separated to operate in a non-contact state, and on the other hand, it can also prevent the fluid from the high-pressure side from leaking to the low-pressure side. [0003] Both the upstream pumping mechanical seal and the dry gas seal are non-contact mechanical seals, and their working principles are similar, but the biggest difference between the upstream pumping mechanical seal and the dry gas seal lies in the different pumping directions of the fluid. The end face...

Claims

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Application Information

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IPC IPC(8): F16J15/16F16J15/34
CPCF16J15/164F16J15/34
Inventor 梁开洪陈炎
Owner 温州市天成密封件制造有限公司
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