CN109210202B - Ultrasonic honeycomb sealing device and method - Google Patents
Ultrasonic honeycomb sealing device and method Download PDFInfo
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- CN109210202B CN109210202B CN201811056890.2A CN201811056890A CN109210202B CN 109210202 B CN109210202 B CN 109210202B CN 201811056890 A CN201811056890 A CN 201811056890A CN 109210202 B CN109210202 B CN 109210202B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
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Abstract
The invention discloses an ultrasonic honeycomb sealing device and method, wherein the device comprises a sealing body and a gear shaft sleeve; the gear shaft sleeve is sleeved on the rotating shaft to be sealed, and the sealing body is arranged outside the gear shaft sleeve in a non-contact manner; the sealing body comprises a sealing ring, a ring groove is arranged on the inner side of the sealing ring, and a base ring, a matching layer, an acoustoelectric chip belt and a back lining are sequentially arranged in the ring groove along the outward direction of the rotating shaft; a plurality of sealing teeth are arranged on one side of the base body ring opposite to the rotating shaft at intervals; an independent sealing interval is formed between adjacent sealing teeth, and a honeycomb belt is arranged in the sealing interval. The sealing structure adopts the sealing teeth to achieve the dual effects of flow resistance and turbulent flow, so that the sealing effect is better; the ultrasonic sealing effect is enhanced by adopting the sound-electricity chip belt; the honeycomb belt effectively plays a role in blocking airflow, and the sealing effect is improved; the sealing device has the advantages of simple structure, convenience in assembly, lower cost and capability of improving the mechanical operation efficiency.
Description
Technical Field
The invention belongs to the technical field of sealing, and relates to an ultrasonic honeycomb sealing device and method.
Background
The research of the dynamic sealing technology has very important significance in the scientific and technical fields, along with the development of industry, the use environment of engineering machinery is changed profoundly, and higher requirements are provided for the sealing effect of the sealing device. The traditional labyrinth seal utilizes the throttling space formed between the seal teeth and the rotor to dissipate the kinetic energy of fluid into heat energy to achieve the sealing effect, and has the advantages of simple structure and low cost, but the sealing effect is not ideal. Compared with labyrinth seal, the honeycomb labyrinth has the advantages of small air leakage and high rotor stability, and is widely applied to the seal of rotary machinery. Although honeycomb seals have improved sealing performance, certain seal gaps still exist, and sometimes leakage is further increased due to the seal gap being broken. In order to improve the sealing characteristics of the honeycomb seal, technicians combine the honeycomb with comb teeth to enhance the dissipation of gas kinetic energy in the sealing device, but due to the construction, the gap between part of the honeycomb and the rotor is increased, and the sealing effect is reduced. There is a need for further improvements in existing honeycomb seal assemblies to improve their sealing characteristics.
Disclosure of Invention
The invention aims to provide an ultrasonic honeycomb sealing device and an ultrasonic honeycomb sealing method, so as to solve the technical problems. The invention utilizes the sound flow phenomenon generated when strong sound waves are transmitted in the medium to generate vortex in the honeycomb sealing device, enhances the dissipation of the fluid kinetic energy in the sealing gap and the honeycomb core lattice, optimizes the existing honeycomb sealing device and further improves the sealing effect of the existing honeycomb sealing device.
In order to achieve the purpose, the invention adopts the technical scheme that:
an ultrasonic honeycomb sealing device comprises a sealing body and a gear shaft sleeve; the gear shaft sleeve is sleeved on the rotating shaft to be sealed, and the sealing body is arranged outside the gear shaft sleeve in a non-contact manner; the sealing body comprises a sealing ring, a ring groove is arranged on the inner side of the sealing ring, and a base ring, a matching layer, an acoustoelectric chip belt and a back lining are sequentially arranged in the ring groove along the outward direction of the rotating shaft; a plurality of sealing teeth are arranged on one side of the base body ring opposite to the rotating shaft at intervals; an independent sealing interval is formed between adjacent sealing teeth, and a honeycomb belt is arranged in the sealing interval.
Further, the device also comprises a sealing sleeve; the sealing body is arranged on the sealing sleeve; a spring piece is arranged between the sealing sleeve and the sealing body.
Further, the honeycomb belt comprises a plurality of honeycomb core grids, and the honeycomb core grids are in a regular hexahedron shape; the honeycomb core grids are made of a Hayster nickel-based high-temperature alloy material and are connected in a welding mode; .
Furthermore, the honeycomb belt is combined with the matrix ring by vacuum brazing, the side length of the honeycomb core grid is 1.6mm, the depth is 3mm, and the wall thickness is 0.1 mm.
Furthermore, one side or two sides of the ring groove of the sealing ring are provided with a plurality of fasteners, and the fasteners are used for fastening the base body ring in the ring groove of the sealing ring.
Furthermore, the sound-electricity chip belt comprises a plurality of sound-electricity chips which are continuously arranged along the circumferential direction of the rotating shaft; the acoustoelectric chip is a rectangular PZT piezoelectric ceramic piece, the ultrasonic frequency range of the acoustoelectric chip is 40kHz-200kHz, and the thickness of the acoustoelectric chip is 1/2 wavelengths when ultrasonic waves are transmitted in the acoustoelectric chip and ranges from 30mm to 2 mm.
Further, the back lining is formed by hot-pressing after tungsten powder and epoxy resin are fully mixed; the tungsten powder has a particle size of 3.5 to 5 μm, a volume fraction of 10 to 15%, and a thickness in the range of 7 to 50 mm.
Furthermore, the matching layer is made of low-viscosity epoxy resin with single-layer filled aluminum oxide; the alumina powder has a grain size of 1.0-2.5 μm and a volume fraction of 5-25%, and the thickness of the matching layer is 1/4 wavelength when ultrasonic waves propagate in the matching layer, and ranges from 3mm to 15 mm.
Furthermore, a sealing tooth groove is formed in the outer side of the gear shaft sleeve corresponding to the sealing tooth part.
An ultrasonic honeycomb sealing method comprising:
ultrasonic waves generated by the outer side of the sound-electricity wafer pass through the matching layer after being absorbed and reflected by the backing, so that most of sound energy passes through the matching layer, the matching layer realizes the transition of ultrasonic impedance, the transmission coefficient of an interface is improved, and sound energy is converged towards the center direction of the rotating shaft; the collected ultrasonic waves transmit the base body ring and are reflected on the gear shaft sleeve, and finally ultrasonic wave sound energy is gathered in the sealing gaps and the honeycomb bands of the sealing intervals, fluid flows through the sealing gaps and the honeycomb bands of the sealing intervals to form vortex, so that the kinetic energy of the fluid is reduced, and the throttling expansion effect of the fluid when the fluid passes through the sealing teeth and the honeycomb bands is enhanced by the sound flow effect of the ultrasonic waves, so that the kinetic energy of the fluid is further dissipated into heat energy.
Compared with the prior art, the invention has the beneficial effects that:
the invention relates to an ultrasonic honeycomb sealing device, wherein a plurality of sealing teeth are arranged on one side of a substrate ring opposite to a rotating shaft at intervals; an independent sealing interval is formed between adjacent sealing teeth, and a honeycomb belt is arranged in the sealing interval; the adoption sets up the dual effect that a plurality of sealed tooth made it can reach choked flow and vortex, and then sealed effect is better.
Furthermore, the ultrasonic sealing effect is enhanced by arranging the sound wafer belt;
further, adopt the effectual obstructed air current effect of honeycomb area of having played of honeycomb area, the ultrasonic wave generates the vortex in honeycomb sealing device, and the dissipation of the fluid kinetic energy in reinforcing seal clearance and the honeycomb core check optimizes current honeycomb sealing device, has improved sealed effect.
Furthermore, the non-contact type sealing is adopted, and compared with the traditional honeycomb sealing and brush sealing, the abrasion and consumption of the sealing device are effectively reduced;
furthermore, the sealing device of the invention does not need lubricating oil and sealing oil, and reduces the dependence of the rotating machinery on lubricating equipment.
Furthermore, the sealing device has the advantages of simple structure, convenience in assembly and lower cost, and can effectively enhance the sealing effect and improve the mechanical operation efficiency.
Drawings
Fig. 1 is a schematic structural diagram of an ultrasonic honeycomb sealing apparatus according to the present invention.
FIG. 2 is a cross-sectional view of an ultrasonic honeycomb seal of the present invention.
FIG. 3 is a schematic structural diagram of an acoustoelectric chip strap according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a honeycomb belt according to an embodiment of the present invention.
The acoustic wave piezoelectric ceramic resonator comprises a rotating shaft 1, a gear shaft sleeve 2, a sealing tooth 3, a screw 4, a sealing ring 5, a sealing sleeve 6, a spring leaf 7, a backing 8, an acoustic wave electric chip belt 9, a matching layer 10, a sealing body 11, a base body ring 12, a honeycomb belt 13, a honeycomb core grid 14 and an acoustic wave electric chip 91.
Detailed Description
The following description will specifically describe embodiments of the present invention with reference to the accompanying drawings.
As shown in fig. 1-4, the invention provides an ultrasonic honeycomb sealing device, which comprises a sealing sleeve 6, a sealing body 11, a spring piece 7 and a gear shaft sleeve 2; the gear shaft sleeve 2 is sleeved on the outer side of the rotating shaft 1 to be sealed, the sealing body is arranged on the outer side of the gear shaft sleeve 2 in a non-contact mode, and the sealing body 11 is installed on the sealing sleeve 6; an elastic component 7 is arranged between the sealing body 11 and the sealing sleeve 6.
The inner side of the sealing sleeve 6 is provided with a sealing groove, the opening part of the sealing groove is provided with a shoulder, and the sealing groove is a T-shaped groove. The sealing body 11 comprises a sealing ring 5, a back lining 8, an acoustoelectric chip strip 9, a matching layer 10 and a base ring 12; a boss is arranged on the outer side of the sealing ring 5, the boss of the sealing ring 5 is matched with a sealing groove of the sealing sleeve 6, and the boss of the sealing ring 5 is a T-shaped boss; the inner side of the sealing ring 5 is provided with a ring groove; a base ring 12, a matching layer 10, an acoustoelectric chip belt 9 and a back lining 8 are sequentially arranged in the ring groove from the rotating shaft 1 to the outside; the base body ring 12 is arranged on the outer side of the gear shaft sleeve 2 in a non-contact mode, the matching layer 10 is arranged on the outer side of the base body ring 12 in a close fit mode, the sound electric chip belt 9 is arranged on the outer side of the matching layer 10 in a close fit mode, and the back lining 8 is arranged on the outer side of the sound electric chip belt in a close fit mode.
And a plurality of fasteners 4 are arranged on one side or two sides of the annular groove of the sealing ring 5, the fasteners 4 are used for fastening the base ring 12 in the annular groove of the sealing ring 5, and the fasteners 4 adopt screws. A plurality of sealing tooth grooves are formed in the outer side of the gear shaft sleeve 2; a plurality of sealing teeth 3 are arranged on the inner side of the base body ring 12, the sealing teeth 3 are matched with sealing tooth grooves on the gear shaft sleeve 2, an independent sealing interval is formed between every two adjacent sealing teeth, and a honeycomb belt 13 is arranged in the sealing interval.
The elastic component 7 is a spring piece, and the elastic component 7 is arranged on the upper part of the boss of the sealing ring 5.
The sound wafer tape 9 comprises a plurality of sound wafers 91, and the sound wafers 91 are continuously arranged along the circumferential direction of the rotating shaft 1.
Example (b):
the invention relates to an ultrasonic honeycomb sealing device.A back lining 8 is formed by hot pressing after tungsten powder and epoxy resin are fully mixed, the particle size of the tungsten powder is 5 mu m, the volume fraction is 15 percent, and the thickness of the back lining 8 is 18 mm;
the acoustic-electric wafer 91 adopts a rectangular PZT piezoelectric ceramic wafer, the ultrasonic response frequency of the acoustic-electric wafer 91 is 100kHz, and the thickness of the acoustic-electric wafer 91 is 9 mm;
the matching layer 10 adopts low-viscosity epoxy resin with single-layer filled aluminum oxide; the grain size of the alumina powder is 2.5 mu m, the volume fraction is 25 percent, the filler alumina powder and the base material viscosity epoxy resin are cast into a thin layer by casting, and the thickness of the matching layer 10 is 7.5 mm;
the honeycomb belt 13 comprises a plurality of honeycomb core grids 14, the honeycomb core grids 14 are in a regular hexahedron shape, the side length of each honeycomb core grid 14 is 1.6mm, the depth of each honeycomb core grid is 3mm, and the wall thickness of each honeycomb core grid is 0.1 mm; the honeycomb core grids 14 are made of a Hayster nickel-based high-temperature alloy material, and the honeycomb belt 13 is formed by welding the honeycomb core grids 14; the honeycomb belt 13 is combined with the base ring 12 in a vacuum brazing furnace through a vacuum welding technology on one side of a honeycomb grid, is connected in a sealing interval between adjacent sealing teeth 3 on the base ring 12, and faces the gear shaft sleeve 2 on the other side.
The invention relates to an ultrasonic honeycomb sealing method, which comprises the following steps: ultrasonic waves generated outside the sound wafer belt 9 are absorbed and reflected by the backing 8, so that most of sound energy passes through the matching layer 10, and the matching layer 10 realizes acoustic impedance transition to improve the interface transmission coefficient and collect the sound energy towards the center of the rotating shaft 1; the collected ultrasonic waves transmit the base body ring 12 and are reflected on the gear shaft sleeve 2, finally, ultrasonic wave sound energy is collected in the seal gaps and the honeycomb core grids 14 of each seal interval, fluid flows through the seal gaps and the honeycomb core grids 14 of each seal interval to form vortex, the kinetic energy of the fluid is reduced, the throttling expansion effect of the fluid when the fluid passes through the seal teeth 3 and the honeycomb belts 13 is enhanced through the sound flow effect of the ultrasonic waves, the kinetic energy of the fluid is further dissipated into heat energy, and the sealing characteristic of the sealing device is improved.
Claims (9)
1. An ultrasonic honeycomb sealing device is characterized by comprising a sealing body (11) and a gear shaft sleeve (2); the gear shaft sleeve (2) is sleeved on the rotating shaft (1) to be sealed, and the sealing body is arranged on the outer side of the gear shaft sleeve (2) in a non-contact manner; the sealing body (11) comprises a sealing ring (5), a ring groove is arranged on the inner side of the sealing ring (5), and a base body ring (12), a matching layer (10), an acoustoelectric chip belt (9) and a back lining (8) are sequentially arranged in the ring groove along the outward direction of the rotating shaft (1); a plurality of sealing teeth (3) are arranged on one side of the base body ring (12) opposite to the rotating shaft (1) at intervals; an independent sealing interval is formed between the adjacent sealing teeth (3), and a honeycomb belt (13) is arranged in the sealing interval;
the sound-electricity chip belt (9) comprises a plurality of sound-electricity chips (91), and the sound-electricity chips (91) are continuously arranged along the circumferential direction of the rotating shaft (1); the acousto-electric chip (91) is a rectangular PZT piezoelectric ceramic piece, the ultrasonic frequency range of the acousto-electric chip (91) is 40kHz-200kHz, and the thickness of the acousto-electric chip (91) is 1/2 wavelength when ultrasonic waves propagate in the acousto-electric chip (91), and the range is 30 mm-2 mm.
2. An ultrasonic honeycomb seal according to claim 1, characterized by further comprising a sealing sleeve (6); the sealing body (11) is arranged on the sealing sleeve (6); a spring piece (7) is arranged between the sealing sleeve (6) and the sealing body (11).
3. An ultrasonic honeycomb seal according to claim 1 characterized in that the honeycomb band (13) comprises a plurality of honeycomb core cells (14), the honeycomb core cells (14) being of the regular hexahedral type; the honeycomb core grids (14) are made of a Hayster nickel-based high-temperature alloy material, and the honeycomb core grids (14) are connected by welding.
4. An ultrasonic honeycomb seal according to claim 3, characterized in that the honeycomb band (13) is joined to the base ring (12) by vacuum brazing, the honeycomb core (14) having a side length of 1.6mm, a depth of 3mm and a wall thickness of 0.1 mm.
5. An ultrasonic honeycomb seal according to claim 1, characterized in that the sealing ring (5) is provided with fastening elements (4) on one or both sides of its circumferential groove, the fastening elements (4) being adapted to fasten the base ring (12) in the circumferential groove of the sealing ring (5).
6. An ultrasonic honeycomb sealing device according to claim 1, characterized in that the backing (8) is formed by hot pressing after tungsten powder and epoxy resin are fully mixed; the particle size of the tungsten powder is 3.5-5 μm, and the volume fraction is 10-15%; the backing (8) has a thickness in the range of 7mm to 50 mm.
7. An ultrasonic honeycomb seal according to claim 1, characterized in that the matching layer (10) is made of a single layer of low viscosity epoxy filled with alumina; the alumina powder has a particle size of 1.0 to 2.5 μm and a volume fraction of 5 to 25%, and the thickness of the matching layer (10) is 1/4 wavelengths at which ultrasonic waves propagate in the matching layer (10), and ranges from 3 to 15 mm.
8. An ultrasonic honeycomb sealing device according to any one of claims 1 to 7, characterized in that the outside of the gear shaft sleeve (2) is provided with sealing tooth grooves corresponding to the sealing teeth (3).
9. An ultrasonic honeycomb sealing method based on any one of claims 1 to 8, comprising:
ultrasonic waves generated outside the sound wafer belt (9) are absorbed and reflected by the backing (8), so that most of sound energy passes through the matching layer (10), the matching layer (10) realizes the transition of ultrasonic impedance, the transmission coefficient of an interface is improved, and sound energy is converged towards the center direction of the rotating shaft (1); the collected ultrasonic waves transmit the base body ring (12) and are reflected on the gear shaft sleeve (2), finally, ultrasonic wave sound energy is collected in the sealing gaps and the honeycomb bands (13) of all sealing intervals, fluid flows through the sealing gaps and the honeycomb bands (13) of all sealing intervals to form vortex, the kinetic energy of the fluid is reduced, the throttling expansion effect of the fluid when the fluid passes through the sealing teeth (3) and the honeycomb bands (13) is enhanced by the sound flow effect of the ultrasonic waves, and the kinetic energy of the fluid is further dissipated into heat energy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811056890.2A CN109210202B (en) | 2018-09-11 | 2018-09-11 | Ultrasonic honeycomb sealing device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811056890.2A CN109210202B (en) | 2018-09-11 | 2018-09-11 | Ultrasonic honeycomb sealing device and method |
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| CN109210202A CN109210202A (en) | 2019-01-15 |
| CN109210202B true CN109210202B (en) | 2020-08-18 |
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| CN201811056890.2A Active CN109210202B (en) | 2018-09-11 | 2018-09-11 | Ultrasonic honeycomb sealing device and method |
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| CN109869329A (en) * | 2019-03-14 | 2019-06-11 | 武汉钢铁有限公司 | Sealing system is classified between a kind of multistage centrifugal compressor grade |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108799508A (en) * | 2018-06-21 | 2018-11-13 | 西安交通大学 | A kind of ultrasonic wave dynamic sealing device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SE503822C2 (en) * | 1995-06-19 | 1996-09-16 | Tetra Laval Holdings & Finance | Device at a drive for an ultrasonic sealing device |
| CN2742239Y (en) * | 2004-02-26 | 2005-11-23 | 吴春芳 | Metal honeycomb seal |
| CN200964852Y (en) * | 2006-10-31 | 2007-10-24 | 贵州航天凯山石油仪器有限公司 | Ultrasonic transducer sealed by O-shaped sealing ring |
| CN201100408Y (en) * | 2007-11-14 | 2008-08-13 | 南京信润科技有限公司 | Multi-level cellular brush sealing device |
| JP2010106778A (en) * | 2008-10-31 | 2010-05-13 | Hitachi Ltd | Seal structure for steam turbine and steam turbine |
| CN102338777A (en) * | 2010-07-15 | 2012-02-01 | 广州多浦乐电子科技有限公司 | High heat conduction and high attenuation backing material for ultrasonic phased array probe and manufacturing method thereof |
| CN102953771A (en) * | 2012-11-16 | 2013-03-06 | 西安交通大学 | Labyrinth damping sealing device with low leakage and high damping performance |
| CN103075205B (en) * | 2012-12-28 | 2015-08-26 | 东方电气集团东方汽轮机有限公司 | A kind of turbine steam seal |
| CN203384378U (en) * | 2013-07-05 | 2014-01-08 | 沈阳北碳密封有限公司 | Novel anti-dust honeycomb seal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108799508A (en) * | 2018-06-21 | 2018-11-13 | 西安交通大学 | A kind of ultrasonic wave dynamic sealing device and method |
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