CN109826960B - Axial multilayer flow channel superposition backflow pumping mechanical seal structure - Google Patents
Axial multilayer flow channel superposition backflow pumping mechanical seal structure Download PDFInfo
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- CN109826960B CN109826960B CN201910162535.1A CN201910162535A CN109826960B CN 109826960 B CN109826960 B CN 109826960B CN 201910162535 A CN201910162535 A CN 201910162535A CN 109826960 B CN109826960 B CN 109826960B
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- 238000005086 pumping Methods 0.000 title claims abstract description 92
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 238000004891 communication Methods 0.000 claims abstract description 25
- 238000011144 upstream manufacturing Methods 0.000 claims description 9
- 239000011159 matrix material Substances 0.000 claims 2
- 239000012530 fluid Substances 0.000 abstract description 21
- 239000011148 porous material Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010992 reflux Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000003068 static effect Effects 0.000 description 4
- 238000010146 3D printing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Abstract
The utility model provides an axial multilayer runner stack backward flow pumping mechanical seal structure, including mechanical seal's rotating ring and quiet ring, one side of rotating ring is the high pressure side, and the other side of rotating ring is the low pressure side, and the low pressure side is the low reaches, and the rotating ring comprises the sealing ring base member of coincide in proper order, forward flow pumping layer, backward flow pumping layer and intermediate communication layer, forward flow pumping layer is sealed, the sealing ring base member is hugged closely to the backward flow pumping layer, intermediate communication layer is located between forward flow pumping layer and the backward flow pumping layer, be equipped with forward flow pumping groove on the forward flow pumping layer, backward flow hole and sealing dam, intermediate communication layer is equipped with the intercommunicating pore, intercommunicating pore is linked with the backward flow hole, be equipped with backward flow pumping groove and gas collecting tank on the backward flow pumping layer, be equipped with the sealing dam of ungrooved between the two adjacent gas collecting tank, the gas collecting tank is linked with the intercommunicating pore. The invention has good fluid dynamic pressure effect, large fluid film rigidity and small leakage, and is suitable for high-speed operation conditions.
Description
Technical Field
The present invention relates to a mechanical end face seal structure of a rotary fluid mechanical seal, and more particularly, to a mechanical seal structure in which a plurality of flow paths are stacked to reduce leakage, and the mechanical seal structure is used for sealing a rotary shaft of a rotary machine such as various high-speed compressors and high-speed pumps.
Background
Various fluid dynamic and static pressure grooves are formed in the sealing end face to enhance dynamic and static pressure bearing capacity of the sealing fluid film, so that non-contact operation of the sealing pair is a common technology of gas or liquid lubrication mechanical sealing. With the application of the slotting end face mechanical seal in high-speed rotating machinery, the mechanical seal leakage needs to be strictly controlled in some occasions for conveying toxic, harmful, inflammable and explosive media so as to avoid the explosion accident caused by the leakage of the sealing media to the external environment. The sealing end face structures of the herringbone grooves and splayed grooves proposed by European patent EP0564153A1, U.S. patent 4645414, chinese patent CN1215135A, CN1045851A and the like are all formed by additionally arranging a backflow pumping type groove on the basis of a forward flow pumping type groove, and fluid leaked to the low pressure side is reversely pumped back to the high pressure side by utilizing the upstream pumping action of the backflow pumping type groove, so that the purpose of reducing leakage is realized. However, the arrangement of the backflow pumping type groove limits the development space of the forward pumping groove, so that the hydrodynamic effect is weakened to a certain extent, namely, the bearing capacity and the rigidity of the fluid film at the end face are reduced while the leakage is reduced.
In the past, laser marking, chemical etching or electroplating methods are adopted to process a laminar groove on the sealing end face, so that the processing of a plurality of layers of complex fluid circulation channels is difficult to realize. In recent years, 3D printing technology is rising, and in particular, development of micro-nano ultra-high precision 3D printing technology makes stacking processing of multiple layers of complex fluid channels possible.
Disclosure of Invention
In order to overcome the defects of insufficient bearing capacity and insufficient rigidity of a fluid film in the existing mechanical end face seal with a backflow pumping type groove under a high-speed condition, the invention provides an axial multilayer superposition flow channel superposition backflow pumping mechanical seal structure which has good fluid dynamic pressure effect, high rigidity of the fluid film and small leakage quantity and is suitable for the high-speed operation condition.
The technical scheme of the invention is as follows:
the utility model provides an axial multilayer runner stack backward flow pumping mechanical seal structure, includes mechanical seal's rotating ring and quiet ring, one side of rotating ring is the high pressure side, and the opposite side of rotating ring is the low pressure side, and the low pressure side is the low reaches, the rotating ring comprises forward flow pumping layer, intermediate communication layer, backward flow pumping layer and sealing ring base member of coincide in proper order, forward flow pumping layer terminal surface is sealed face, the sealing ring base member is hugged closely to the backward flow pumping layer, intermediate communication layer is located between forward flow pumping layer and the backward flow pumping layer, be equipped with forward flow pumping groove, backward flow hole and sealing dam on the forward flow pumping layer, intermediate communication layer is equipped with the intercommunicating pore, the intercommunicating pore is linked together with the backward flow hole, be equipped with backward flow pumping groove and gas collecting channel on the backward flow pumping layer, be equipped with the sealing weir of ungrooved between the two adjacent gas collecting channels, the gas collecting channel is linked together with the intercommunicating pore.
The sealing dam without grooves in the downstream pumping layer is positioned on the downstream side, the downstream pumping type groove is positioned on the upstream side, and the backflow hole is positioned on the sealing dam.
The thickness of the downstream pumping layer is 1-200 mu m, and the preferable value is 5-30 mu m.
The thickness of the reflux pumping layer is 0.1-2 mm.
The thickness of the middle communication layer is 0.5-5 mm.
The working principle of the invention is as follows:
and processing the reflux pumping layer, the middle communication layer and the downstream pumping layer by layer on the sealing ring substrate by adopting a high-precision 3D printing technology, wherein the end face is polished to the specified roughness requirement by adopting ultra-precision grinding and surface polishing technologies after the processing of each layer is finished. When the hydraulic dynamic pressure type downstream-side sealing dam is operated, the downstream pumping fluid dynamic pressure type groove of the downstream pumping layer can pump fluid medium on the upstream side into the sealing end face, the pumped fluid medium flows along the downstream side and the windward side wall of the downstream pumping groove under the action of radial pressure difference and circumferential high-speed shearing, and when the hydraulic dynamic pressure type downstream-side sealing dam is subjected to the flow blocking action of the downstream sealing dam and the circumferential sealing dam, the fluid is compressed, and the pressure is increased to form the hydrodynamic static pressure bearing capacity. A part of the fluid passing over the downstream pumping groove root position continues to flow to the downstream side, and finally flows out from the downstream side to form leakage; the other part flows along the axial direction through the backflow hole on the sealing dam, enters the backflow pumping groove of the backflow pumping layer through the communication hole of the middle communication layer and the gas collecting groove of the backflow pumping layer, and is reversely pumped back to the upstream side along the backflow pumping groove under the action of high-speed rotation centrifugal force, so that the purpose of reducing leakage is realized.
The invention has the advantages that:
(1) The fluid medium pumped into the sealing gap from the downstream pumping groove can partially enter the gas collecting groove in the reflux pumping layer through the reflux hole and the communication hole and reversely pumped back to the upstream side through the reflux pumping groove, thereby reducing the leakage of the fluid medium directly to the downstream side and improving the tightness.
(2) As the forward flow pumping groove and the backward flow pumping groove are arranged in a layered manner along the axial direction, the arrangement of the backward flow pumping groove does not affect the full development of the macroscopic contour and the groove depth of the forward flow pumping groove, compared with the traditional herringbone groove and splayed groove end face mechanical seal with the backward flow pumping groove, the bearing capacity and the fluid film rigidity of the fluid film of the sealing end face can be improved, the probability of collision and grinding of the two sealing end faces during high-speed operation is reduced, and the service life and the reliability of the mechanical seal are prolonged.
Drawings
FIG. 1 is a schematic three-dimensional structure of a first embodiment of the present invention;
FIG. 2 is an axially disassembled schematic view of a multi-layered flow channel sealing structure according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram of an end face structure of a downstream pumping layer according to a first embodiment of the present invention;
fig. 4 is a schematic three-dimensional structure of a second embodiment of the present invention.
Detailed Description
The invention will be further described in detail with reference to the accompanying drawings.
Example 1
Referring to fig. 1, 2 and 3, an axial multilayer runner superposition backflow pumping mechanical seal structure comprises a mechanical seal moving ring and a static ring, wherein one side of the moving ring is a high-pressure side, namely an upstream side, the other side of the moving ring is a low-pressure side, namely a downstream side, the moving ring is composed of a forward flow pumping layer 1, an intermediate communication layer 2, a backflow pumping layer 3 and a sealing ring base body 4 which are sequentially overlapped, the end face of the forward flow pumping layer 1 is a sealing face, the backflow pumping layer 3 is tightly attached to the sealing ring base body 4, the intermediate communication layer 2 is positioned between the forward flow pumping layer 1 and the backflow pumping layer 3, the forward flow pumping layer 1 is provided with a forward flow pumping groove 11, a sealing weir 12, a backflow hole 13 and a sealing dam 14, the intermediate communication layer 2 is provided with a communication hole 21, the communication hole 21 is communicated with the backflow pumping groove 31 and a gas collecting groove 33, a sealing weir 32 which is not grooved is arranged between the two adjacent gas grooves 33, and the collecting groove 33 is communicated with the communication hole 21.
The seal dam 14 without grooves in the downstream pumping layer 1 is located on the downstream side, the downstream pumping type groove 11 is located on the upstream side, and the return hole 13 is located on the seal dam 14.
The thickness of the downstream pumping layer 1 is 1-200 μm, and the preferable value is 5-30 μm.
The thickness of the reflux pumping layer 3 is 0.1-2 mm.
The thickness of the middle communication layer 2 is 0.5-5 mm.
Example two
Referring to fig. 4, the difference between this embodiment and the first embodiment is that the downstream pumping layer 1 is provided with a downstream pumping groove 11, a sealing dam 12, a backflow hole 13, a sealing dam 14 and an annular groove 15, the annular groove 15 is located between the upstream downstream pumping groove 11 and the downstream sealing dam 14, the backflow hole 13 is located in the annular groove 15, and the depth of the annular groove 15 is smaller than the thickness of the downstream pumping layer 1.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms set forth in the embodiments, but the scope of protection of the present invention and equivalent technical means as will occur to those skilled in the art based on the inventive concept.
Claims (4)
1. The utility model provides an axial multilayer runner stack backward flow pumping mechanical seal structure, includes mechanical seal's rotating ring and quiet ring, one side of rotating ring is the high pressure side and is the upper reaches, the opposite side of rotating ring is the low pressure side and is the low reaches, its characterized in that: the movable ring is composed of a forward flow pumping layer, an intermediate communication layer, a backflow pumping layer and a sealing ring matrix which are overlapped in sequence, the end face of the forward flow pumping layer is a sealing face, the backflow pumping layer is clung to the sealing ring matrix, the intermediate communication layer is positioned between the forward flow pumping layer and the backflow pumping layer, a forward flow pumping groove, a backflow hole and a sealing dam are arranged on the forward flow pumping layer, the intermediate communication layer is provided with a communication hole, the communication hole is communicated with the backflow hole, a backflow pumping groove and a gas collecting groove are arranged on the backflow pumping layer, a sealing weir without a groove is arranged between two adjacent gas collecting grooves, and the gas collecting groove is communicated with the communication hole.
2. An axial multi-layer flow channel superposition backflow pumping mechanical seal structure as defined in claim 1, wherein: the sealing dam without grooves in the downstream pumping layer is positioned on the downstream side, the downstream pumping type groove is positioned on the upstream side, and the backflow hole is positioned on the sealing dam.
3. An axial multi-layer flow channel superposition backflow pumping mechanical seal structure as defined in claim 1, wherein: the thickness of the forward flow pumping layer is 1-200 mu m, the thickness of the return flow pumping layer is 0.1-2 mm, and the thickness of the middle communication layer is 0.5-5 mm.
4. An axial multi-layer flow channel superposition backflow pumping mechanical seal structure as defined in claim 3, wherein: the thickness of the downstream pumping layer is 5-30 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162535.1A CN109826960B (en) | 2019-03-05 | 2019-03-05 | Axial multilayer flow channel superposition backflow pumping mechanical seal structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162535.1A CN109826960B (en) | 2019-03-05 | 2019-03-05 | Axial multilayer flow channel superposition backflow pumping mechanical seal structure |
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| Publication Number | Publication Date |
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| CN109826960A CN109826960A (en) | 2019-05-31 |
| CN109826960B true CN109826960B (en) | 2024-03-26 |
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| CN201910162535.1A Active CN109826960B (en) | 2019-03-05 | 2019-03-05 | Axial multilayer flow channel superposition backflow pumping mechanical seal structure |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110935289B (en) * | 2019-12-04 | 2022-02-11 | 宁夏盈氟金和科技有限公司 | Sealed gas collection absorption system of hydrogen fluoride reacting furnace head and tail |
| GB2612157A (en) | 2021-10-19 | 2023-04-26 | Crane John Uk Ltd | Pumping seal for rotating machines |
| CN114060521A (en) * | 2021-11-10 | 2022-02-18 | 浙江环誉泵业科技有限公司 | Mechanical seal end face self-circulation backflow groove with strong self-lubricating and self-cooling effects |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09503276A (en) * | 1993-09-01 | 1997-03-31 | デュラメタリック コーポレーション | Face-sealing device with angled annular groove |
| CN101644333A (en) * | 2009-08-20 | 2010-02-10 | 浙江工业大学 | Gas end surface sealing structure with three-dimensional feather-like textured bottom shaped grooves |
| CN102588600A (en) * | 2012-02-15 | 2012-07-18 | 浙江工业大学 | Profiled groove end surface non-contact mechanical seal with backflow function |
| CN103267132A (en) * | 2013-05-28 | 2013-08-28 | 南京林业大学 | Self-pumping fluid-dynamic-pressure-type mechanical seal |
| CN104913066A (en) * | 2015-06-15 | 2015-09-16 | 浙江工业大学 | Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves |
| CN209705276U (en) * | 2019-03-05 | 2019-11-29 | 浙江工业大学 | A kind of axial multilayer runner superposition reflux pumping mechanical seal structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7044470B2 (en) * | 2000-07-12 | 2006-05-16 | Perkinelmer, Inc. | Rotary face seal assembly |
-
2019
- 2019-03-05 CN CN201910162535.1A patent/CN109826960B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09503276A (en) * | 1993-09-01 | 1997-03-31 | デュラメタリック コーポレーション | Face-sealing device with angled annular groove |
| CN101644333A (en) * | 2009-08-20 | 2010-02-10 | 浙江工业大学 | Gas end surface sealing structure with three-dimensional feather-like textured bottom shaped grooves |
| CN102588600A (en) * | 2012-02-15 | 2012-07-18 | 浙江工业大学 | Profiled groove end surface non-contact mechanical seal with backflow function |
| CN103267132A (en) * | 2013-05-28 | 2013-08-28 | 南京林业大学 | Self-pumping fluid-dynamic-pressure-type mechanical seal |
| CN104913066A (en) * | 2015-06-15 | 2015-09-16 | 浙江工业大学 | Mechanical sealing structure of gas lubricating end face with human pyramid-like combined groove deep grooves |
| CN209705276U (en) * | 2019-03-05 | 2019-11-29 | 浙江工业大学 | A kind of axial multilayer runner superposition reflux pumping mechanical seal structure |
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