CN112648019B - Flexible sealing device - Google Patents
Flexible sealing device Download PDFInfo
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- CN112648019B CN112648019B CN202110141885.7A CN202110141885A CN112648019B CN 112648019 B CN112648019 B CN 112648019B CN 202110141885 A CN202110141885 A CN 202110141885A CN 112648019 B CN112648019 B CN 112648019B
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- 238000007789 sealing Methods 0.000 title claims abstract description 282
- 244000126211 Hericium coralloides Species 0.000 claims abstract description 43
- 238000005192 partition Methods 0.000 claims abstract description 22
- 230000006835 compression Effects 0.000 claims description 16
- 238000007906 compression Methods 0.000 claims description 16
- 238000009423 ventilation Methods 0.000 claims description 11
- 230000000694 effects Effects 0.000 abstract description 8
- 238000006073 displacement reaction Methods 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 4
- 230000006837 decompression Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Abstract
The invention relates to a flexible sealing device, and belongs to the technical field of mechanical dynamic sealing. The invention comprises an upper sealing seat, a lower sealing seat, a comb tooth sealing piece, a front baffle plate, a fingertip sealing piece, a baffle plate, brush wires, a rear baffle plate and a flexible supporting piece; the comb tooth sealing piece is attached with a flexible supporting piece and is installed in the lower sealing seat, a plurality of fingertip sealing pieces are clamped and installed between the front baffle plate and the partition plate, the front baffle plate is attached with the upper portion of the comb tooth sealing piece and the flexible supporting piece, the brush wires are fixedly installed in the rear baffle plate, one side of the rear baffle plate is attached with the partition plate and is installed in the lower sealing seat, the upper sealing seat is fixedly installed on the lower sealing seat, and the other side of the rear baffle plate is attached to the inner walls of the upper sealing seat and the lower sealing seat. The flexible seal is adopted to adapt to displacement excitation of the rotor shaft; multistage sealing, high sealing performance, high stability and simple structure, and can reduce the processing cost of the sealing device; the hysteresis effect of the sealing device can be reduced, the service life is long, the leakage rate is low, and the sealing work efficiency is high.
Description
Technical Field
The invention relates to a flexible sealing device, in particular to a flexible sealing device for an aeroengine, and belongs to the technical field of mechanical dynamic sealing.
Background
With the rapid development of aerospace industry, people pay more attention to the performance of an engine, and the sealing technology and the sealing performance are important factors influencing the performance of the engine. The advanced sealing technology can greatly improve the performance of the engine and reduce the fuel consumption rate and the movement and maintenance cost. The sealing types of the aero-engine mainly comprise a comb tooth sealing, a brush sealing, a fingertip sealing and the like. In order to adapt to the centrifugal or thermal expansion of the rotor, the comb tooth seal must keep enough clearance with the rotor in the use process, so that the leakage amount of the non-contact seal structure is large, and the leakage amount can be reduced, and the leakage amount is designed by adopting a small clearance but cannot compensate displacement excitation, so that the leakage amount is extremely easy to generate large abrasion. The brush type seal can be used as a flexible seal to adapt to the relative gap change between the rotor and the stator, the seal gap can be well controlled, the leakage amount is 1/5-1/10 of that of the comb tooth seal, but after long-time operation, the brush wires are easy to break, the brush wires are in contact with a rotor runway to generate friction and heat, the reliability of the seal is affected, and meanwhile, the brush type seal is formed by tightly arranging tens of thousands of brush wires, so that the manufacturing process is complex, and the manufacturing cost is high. Under the background, the fingertip seal is formed by superposing a plurality of fingertip sheets provided with fingertip beams, and the fingertip beams of different fingertip sheets are staggered to block the fingertip beam gaps on the adjacent fingertip sheets. Aeroengines, as a representative of high-speed fluid-mechanical systems, operate under high-temperature, high-pressure, high-load conditions. Under high pressure, brush filaments of the brush seal and fingertip beams of the fingertip seal are bent downstream through a protective gap of the tailgate to undergo plastic deformation, thereby causing seal failure. Therefore, a sealing structure capable of bearing high pressure and having a flexible characteristic is needed to meet the working condition of the existing aeroengine. According to the invention, the comb teeth seal, the fingertip seal and the brush seal are integrated according to the characteristics of the comb teeth seal, namely, the comb teeth seal with highest rigidity is arranged at the forefront, and the fingertip seal with slightly higher rigidity and thinner axial thickness is arranged before the brush seal, so that the bearing capacity of the fingertip seal and the brush seal can be improved in a targeted manner, and the flexibility characteristic of a sealing structure can be maintained, thereby improving the sealing characteristic of the whole sealing device.
Disclosure of Invention
The invention aims to provide a flexible sealing device combining a comb seal, a fingertip seal and a brush seal, so as to solve the problems of low bearing capacity, large leakage, serious abrasion and the like of the conventional sealing structure.
The invention is realized according to the following technical scheme: a flexible sealing device comprises an upper sealing seat 1, a lower sealing seat 2, a comb tooth sealing piece 3, a front baffle 4, a fingertip sealing piece 5, a baffle 6, brush wires 7, a rear baffle 8 and a flexible supporting piece 9; the upper sealing seat 1 and the lower sealing seat 2 are internally provided with a mounting groove I29, the comb tooth sealing piece 3 is attached with a flexible supporting piece 9 and is mounted in the mounting groove I29 of the lower sealing seat 2, a plurality of fingertip sealing pieces 5 are mounted between the front baffle 4 and the partition plate 6 in a clamping manner, the front baffle 4 is attached with the upper part of the comb tooth sealing piece 3 and the flexible supporting piece 9, the front baffle 4, the fingertip sealing pieces 5 and the partition plate 6 are mounted in the mounting groove I29 of the lower sealing seat 2, the brush wires 7 are fixedly mounted in the rear baffle 8, one side of the rear baffle 8 is attached with the partition plate 6 and is mounted in the mounting groove I29 of the lower sealing seat 2, the upper sealing seat 1 is fixedly mounted on the lower sealing seat 2, the comb tooth sealing piece 3, The front baffle plate 4, the fingertip sealing piece 5, the baffle plate 6, the brush wires 7, the rear baffle plate 8 and the flexible supporting piece 9 are all positioned in a placement groove I29 of the upper sealing seat 1, the other side of the rear baffle plate 8 is attached to the inner walls of the upper sealing seat 1 and the lower sealing seat 2, threaded holes 23 are formed in the upper sealing seat 1 and the lower sealing seat 2, and the flexible supporting piece 9 comprises a thrust plate 10, a supporting spring 11, a sliding pin 12 and a supporting column 13; the lower part of the support column 13 is provided with a chute II 15, the upper part of the support column 13 is externally provided with an external thread 28, the boosting plate 10 is of an arc plate structure, the arc plate is provided with a support cylinder 30, the support cylinder 30 is provided with a chute I14, a sliding pin 12 penetrates through the chute II 15 at the lower part of the support column 13, the lower part of the support column 13 is connected with the chute I14 on the support cylinder 30 in a matched manner through the sliding pin 12, the other end of the support column 13 is connected with a threaded hole 23 in a matched manner through the external thread 28 and the threaded hole 23 and is arranged in a setting groove I29 of the upper sealing seat 1 and the lower sealing seat 2, the support spring 11 is positioned in the support cylinder 30, one end of the support spring 11 is attached to the boosting plate 10, the other end of the supporting spring 11 is propped against the lower part of the sliding pin 12, one end of the supporting column 13 is positioned in the supporting spring 11, the outer part of the comb tooth sealing piece 3 is attached to the boosting plate 10 of the flexible supporting piece 9, one side of the comb tooth sealing piece 3 is attached to the inner cavity walls of the upper sealing seat 1 and the lower sealing seat 2, through holes 24 are uniformly formed in each fingertip sealing piece 5, a pressure release groove I20 is formed in the baffle plate 6, the pressure release groove I20 is used for preventing leakage caused by hysteresis effect of the fingertip sealing pieces 5, an air vent 19 is formed in one side of the baffle plate 6 attached to the fingertip sealing pieces 5, a compression spring 16 is arranged in the air vent 19, a spring supporting plate 18 is connected and arranged at the other end of the compression spring 16, the compression springs 16 are all positioned in the ventilation grooves 19, the shape and the size of the spring supporting plates 18 are the same as those of the ventilation grooves 19, the spring supporting plates 18 are attached to the fingertip sealing plates 5, the center positions of the spring supporting plates 18 are the same as the positions of the through holes 24 of the fingertip sealing plates 5, the front baffle plate 4 is provided with a fixing Kong 17, each fingertip sealing plate 5 is uniformly provided with a fixing hole II 25, the baffle plate 6 is provided with a fixing hole I22, the fingertip sealing plates 5 are clamped and installed between the front baffle plate 4 and the baffle plate 6 through the fixing Kong 17, the fixing holes II 25 and the fixing holes I22, the front baffle plate 4 is of an annular structure, the inner diameter of the front baffle plate 4 is larger than that of the fingertip sealing plates 5, a cavity is formed between the fingertip sealing piece 5 and the other side of the comb tooth sealing piece 3, a placement groove II 21 is formed in one side of the rear baffle 8, a pressure relief groove II 26 is formed in the rear baffle 8 at the placement groove II 21, the pressure relief groove II 26 is used for preventing hysteresis effects of the brush wires 7, the pressure relief groove II 26 can reduce abrasion of the brush wires 7 and the rear baffle 8 so as to prolong the service life of the brush wires 7, the brush wires 7 are fixedly installed in the placement groove II 21 of the rear baffle 8, a fixing hole III 27 is formed in the rear baffle 8, and the rear baffle 8 is connected with the partition plate 6 through the fixing hole III 27.
The upper sealing seat 1 and the lower sealing seat 2 have the same structure.
The sliding groove I14 of the supporting cylinder 30 and the sliding groove II 15 of the supporting column 13 have the same structure size, and the appearance size of the sliding pin 12 is the same as the structure sizes of the sliding groove I14 and the sliding groove II 15.
The thickness of the fingertip sealing sheet 5 is 0.1-2.4 mm.
The axial thickness of the brush filaments 7 in the rear baffle 8 is less than 1.6 mm.
The gap between the bottom end of the comb seal element 3 and the rotor shaft is 0.3-1.2 mm, the gap between the bottom of the fingertip seal piece 5 and the rotor shaft is 0.05-0.4 mm, and the gap between the brush wire 7 and the rotor shaft is 0.01-0.2 mm.
The number of the fingertip sealing sheets 5 between the front baffle 4 and the baffle 6 is 3-15.
The working principle of the flexible sealing device is as follows: when the seal device works, gas flows to a fingertip through the comb seal 3 at the upstream high-pressure side in a sealing and brush-type sealing way, firstly, part of high-pressure air flows through the comb seal 3, the fluid generates a throttling effect under the action of the comb plate of the comb seal 3, and the pressure of part of the fluid is gradually reduced so as to achieve the sealing effect, the upper part of the comb seal 3 is provided with a flexible support piece 9, and the flexible support piece 9 can greatly reduce the friction and abrasion of the comb seal 3 and a rotor shaft, so that the sealing failure rate is reduced; when the pressure difference of fluid passing through the comb tooth sealing piece 3 is lower, the fingertip sealing piece 5 can restore to the initial position along with the jump of the rotor under the action of self elastic restoring force, hysteresis is avoided to play a role in sealing, if the pressure difference is still higher at the moment, the fluid pushes the spring supporting plate 18 on the baffle plate 6 into the ventilation groove 19 through the through hole 24 of the fingertip sealing piece 5, the fluid enters the pressure release groove I20, the pressure difference at two ends of the fingertip sealing is reduced, the effect of reducing friction resistance of the fingertip sealing piece 5 and the baffle plate 6 is achieved, and hysteresis is reduced to play a role in sealing; at this time, although part of the fluid leaks through the fingertip sealing piece 5, the pressure difference of the leaked fluid is reduced after the fluid passes through the fingertip sealing piece 5, and when the fluid passes through the brush wire 7 again, the brush wire 7 can play a role in sealing, and at this time, the lower pressure difference can not cause the brush wire 7 to deform axially to influence the leakage, so that the brush type sealing formed by the rear baffle 8 and the brush wire 7 can complete the sealing function completely; when the radial runout of the rotor shaft influences the comb seal element 3 in working, the comb seal element 3 transmits force to the boosting plate 10 of the flexible support element 9, the boosting plate 10 transmits force to the support columns 13, the support columns 13 transmit force to the sliding pins 12, the sliding pins 12 move in the sliding grooves I14 and II 15 to move against the support springs 11, mechanical energy of shaft runout is converted into elastic potential energy of the springs, and the flexibility of the comb seal is achieved.
The invention has the following beneficial effects:
1. The flexible seal is adopted to adapt to displacement excitation of the rotor shaft, the compensation effect of the flexible support piece can reduce contact stiffness, and the self-adaptability is improved;
2. The flexible seal can meet the sealing requirements of the engine under the conditions of high temperature, high pressure and high speed, has lower use cost and wide application range;
3. Multistage sealing, high sealing performance, high stability and simple structure, and can reduce the processing cost of the sealing device;
4. The dynamic response capability of the sealing device under the action of fluid pressure can be improved, the hysteresis effect of the sealing device can be reduced, the service life is long, the leakage rate is low, and the sealing working efficiency is high.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the internal structure of the present invention;
FIG. 3 is a schematic view of the internal mounting structure of the present invention;
FIG. 4 is a schematic view of the flexible support structure of the present invention;
FIG. 5 is a schematic view of a support column according to the present invention;
FIG. 6 is a schematic view of a separator structure according to the present invention;
FIG. 7 is a schematic side view of a separator plate according to the present invention;
FIG. 8 is a schematic view of the structure of the upper seal holder and the lower seal holder of the present invention;
FIG. 9 is a schematic view of a fingertip seal according to the present invention;
FIG. 10 is a schematic view of a brush wire mounting structure of the present invention;
FIG. 11 is a schematic view of the structure of the tailgate of the invention.
The reference numerals in the figures are: 1: upper seal seat, 2: lower seal holder, 3: grate seal, 4: front baffle, 5: fingertip sealing sheet, 6: separator, 7: brushing wires, 8: a rear baffle plate, 9: flexible support, 10: a thrust plate, 11: support spring, 12: slide pin, 13: support column, 14: chute I, 15: slide grooves II and 16: compression spring, 17: fixing holes iv, 18: spring stay plate, 19: ventilation groove, 20: decompression groove I, 21: mounting grooves II, 22: fixing holes I, 23: screw hole, 24: through holes, 25: fixing holes II, 26: decompression groove II, 27: fixing holes III, 28: external threads, 29: mounting grooves I, 30: and a supporting cylinder.
Detailed Description
The invention will be further described with reference to the drawings and examples, but the invention is not limited to the scope.
Example 1: as shown in fig. 1-11, a flexible sealing device comprises an upper sealing seat 1, a lower sealing seat 2, a comb tooth sealing piece 3, a front baffle plate 4, a fingertip sealing piece 5, a baffle plate 6, brush wires 7, a rear baffle plate 8 and a flexible supporting piece 9; the upper sealing seat 1 and the lower sealing seat 2 are internally provided with a mounting groove I29, the comb tooth sealing piece 3 is attached with a flexible supporting piece 9 and is mounted in the mounting groove I29 of the lower sealing seat 2, a plurality of fingertip sealing pieces 5 are mounted between the front baffle 4 and the partition plate 6 in a clamping manner, the front baffle 4 is attached with the upper part of the comb tooth sealing piece 3 and the flexible supporting piece 9, the front baffle 4, the fingertip sealing pieces 5 and the partition plate 6 are mounted in the mounting groove I29 of the lower sealing seat 2, the brush wires 7 are fixedly mounted in the rear baffle 8, one side of the rear baffle 8 is attached with the partition plate 6 and is mounted in the mounting groove I29 of the lower sealing seat 2, the upper sealing seat 1 is fixedly mounted on the lower sealing seat 2, the comb tooth sealing piece 3, The front baffle plate 4, the fingertip sealing piece 5, the baffle plate 6, the brush wires 7, the rear baffle plate 8 and the flexible supporting piece 9 are all positioned in a placement groove I29 of the upper sealing seat 1, the other side of the rear baffle plate 8 is attached to the inner walls of the upper sealing seat 1 and the lower sealing seat 2, threaded holes 23 are formed in the upper sealing seat 1 and the lower sealing seat 2, and the flexible supporting piece 9 comprises a thrust plate 10, a supporting spring 11, a sliding pin 12 and a supporting column 13; the lower part of the support column 13 is provided with a chute II 15, the upper part of the support column 13 is externally provided with an external thread 28, the boosting plate 10 is of an arc plate structure, the arc plate is provided with a support cylinder 30, the support cylinder 30 is provided with a chute I14, a sliding pin 12 penetrates through the chute II 15 at the lower part of the support column 13, the lower part of the support column 13 is connected with the chute I14 on the support cylinder 30 in a matched manner through the sliding pin 12, the other end of the support column 13 is connected with a threaded hole 23 in a matched manner through the external thread 28 and the threaded hole 23 and is arranged in a setting groove I29 of the upper sealing seat 1 and the lower sealing seat 2, the support spring 11 is positioned in the support cylinder 30, one end of the support spring 11 is attached to the boosting plate 10, the other end of the supporting spring 11 is propped against the lower part of the sliding pin 12, one end of the supporting column 13 is positioned in the supporting spring 11, the outer part of the comb tooth sealing piece 3 is attached to the boosting plate 10 of the flexible supporting piece 9, one side of the comb tooth sealing piece 3 is attached to the inner cavity walls of the upper sealing seat 1 and the lower sealing seat 2, through holes 24 are uniformly formed in each fingertip sealing piece 5, a pressure release groove I20 is formed in the baffle plate 6, an air vent groove 19 is formed in one side of the baffle plate 6 attached to the fingertip sealing piece 5, a compression spring 16 is arranged in the air vent groove 19, a spring supporting plate 18 is connected and arranged at the other end of the compression spring 16, the compression springs 16 are all positioned in the air vent groove 19, the shape and the structure of the spring supporting plate 18 are the same as those of the ventilation groove 19, the spring supporting plate 18 is attached to the fingertip sealing plates 5, the center position of the spring supporting plate 18 is the same as the position of the through hole 24 of the fingertip sealing plate 5, the front baffle plate 4 is provided with a fixing Kong, each fingertip sealing plate 5 is uniformly provided with a fixing hole II 25, the baffle plate 6 is provided with a fixing hole I22, the fingertip sealing plates 5 are clamped and installed between the front baffle plate 4 and the baffle plate 6 through the fixing Kong, the fixing holes II 25 and the fixing holes I22, the front baffle plate 4 is of an annular structure, the inner diameter of the front baffle plate 4 is larger than that of the fingertip sealing plates 5, a cavity is formed between the fingertip sealing plates 5 and the other side of the comb tooth sealing piece 3, a mounting groove II 21 is formed in one side of the rear baffle plate 8, a pressure relief groove II 26 is formed in the rear baffle plate 8 at the position of the mounting groove II 21, the brush wires 7 are fixedly arranged in the mounting groove II 21 of the rear baffle plate 8, a fixing hole III 27 is formed in the rear baffle plate 8, and the rear baffle plate 8 is connected with the partition plate 6 through the fixing hole III 27.
The upper sealing seat 1 and the lower sealing seat 2 have the same structure. The sliding groove I14 of the supporting cylinder 30 is identical to the sliding groove II 15 of the supporting column 13 in structure, and the sliding pin 12 is identical to the sliding groove I14 and the sliding groove II 15 in shape.
The fingertip sealing sheet 5 has a thickness of 0.1mm. The axial thickness of the brush filaments 7 in the rear baffle 8 is not more than 0.8 mm.
The clearance between the bottom end of the comb seal 3 and the rotor shaft is 0.3 mm, the clearance between the bottom of the fingertip seal piece 5 and the rotor shaft is 0.05 mm, and the clearance between the brush wire 7 and the rotor shaft is 0.05 mm.
The number of fingertip sealing sheets 5 between the front baffle 4 and the partition plate 6 is 3.
Example 2: as shown in fig. 1-11, a flexible sealing device comprises an upper sealing seat 1, a lower sealing seat 2, a comb tooth sealing piece 3, a front baffle plate 4, a fingertip sealing piece 5, a baffle plate 6, brush wires 7, a rear baffle plate 8 and a flexible supporting piece 9; the upper sealing seat 1 and the lower sealing seat 2 are internally provided with a mounting groove I29, the comb tooth sealing piece 3 is attached with a flexible supporting piece 9 and is mounted in the mounting groove I29 of the lower sealing seat 2, a plurality of fingertip sealing pieces 5 are mounted between the front baffle 4 and the partition plate 6 in a clamping manner, the front baffle 4 is attached with the upper part of the comb tooth sealing piece 3 and the flexible supporting piece 9, the front baffle 4, the fingertip sealing pieces 5 and the partition plate 6 are mounted in the mounting groove I29 of the lower sealing seat 2, the brush wires 7 are fixedly mounted in the rear baffle 8, one side of the rear baffle 8 is attached with the partition plate 6 and is mounted in the mounting groove I29 of the lower sealing seat 2, the upper sealing seat 1 is fixedly mounted on the lower sealing seat 2, the comb tooth sealing piece 3, The front baffle plate 4, the fingertip sealing piece 5, the baffle plate 6, the brush wires 7, the rear baffle plate 8 and the flexible supporting piece 9 are all positioned in a placement groove I29 of the upper sealing seat 1, the other side of the rear baffle plate 8 is attached to the inner walls of the upper sealing seat 1 and the lower sealing seat 2, threaded holes 23 are formed in the upper sealing seat 1 and the lower sealing seat 2, and the flexible supporting piece 9 comprises a thrust plate 10, a supporting spring 11, a sliding pin 12 and a supporting column 13; the lower part of the support column 13 is provided with a chute II 15, the upper part of the support column 13 is externally provided with an external thread 28, the boosting plate 10 is of an arc plate structure, the arc plate is provided with a support cylinder 30, the support cylinder 30 is provided with a chute I14, a sliding pin 12 penetrates through the chute II 15 at the lower part of the support column 13, the lower part of the support column 13 is connected with the chute I14 on the support cylinder 30 in a matched manner through the sliding pin 12, the other end of the support column 13 is connected with a threaded hole 23 in a matched manner through the external thread 28 and the threaded hole 23 and is arranged in a setting groove I29 of the upper sealing seat 1 and the lower sealing seat 2, the support spring 11 is positioned in the support cylinder 30, one end of the support spring 11 is attached to the boosting plate 10, the other end of the supporting spring 11 is propped against the lower part of the sliding pin 12, one end of the supporting column 13 is positioned in the supporting spring 11, the outer part of the comb tooth sealing piece 3 is attached to the boosting plate 10 of the flexible supporting piece 9, one side of the comb tooth sealing piece 3 is attached to the inner cavity walls of the upper sealing seat 1 and the lower sealing seat 2, through holes 24 are uniformly formed in each fingertip sealing piece 5, a pressure release groove I20 is formed in the baffle plate 6, an air vent groove 19 is formed in one side of the baffle plate 6 attached to the fingertip sealing piece 5, a compression spring 16 is arranged in the air vent groove 19, a spring supporting plate 18 is connected and arranged at the other end of the compression spring 16, the compression springs 16 are all positioned in the air vent groove 19, the shape and the structure of the spring supporting plate 18 are the same as those of the ventilation groove 19, the spring supporting plate 18 is attached to the fingertip sealing plates 5, the center position of the spring supporting plate 18 is the same as the position of the through hole 24 of the fingertip sealing plate 5, the front baffle plate 4 is provided with a fixing Kong, each fingertip sealing plate 5 is uniformly provided with a fixing hole II 25, the baffle plate 6 is provided with a fixing hole I22, the fingertip sealing plates 5 are clamped and installed between the front baffle plate 4 and the baffle plate 6 through the fixing Kong, the fixing holes II 25 and the fixing holes I22, the front baffle plate 4 is of an annular structure, the inner diameter of the front baffle plate 4 is larger than that of the fingertip sealing plates 5, a cavity is formed between the fingertip sealing plates 5 and the other side of the comb tooth sealing piece 3, a mounting groove II 21 is formed in one side of the rear baffle plate 8, a pressure relief groove II 26 is formed in the rear baffle plate 8 at the position of the mounting groove II 21, the brush wires 7 are fixedly arranged in the mounting groove II 21 of the rear baffle plate 8, a fixing hole III 27 is formed in the rear baffle plate 8, and the rear baffle plate 8 is connected with the partition plate 6 through the fixing hole III 27.
The upper sealing seat 1 and the lower sealing seat 2 have the same structure. The sliding groove I14 of the supporting cylinder 30 is identical to the sliding groove II 15 of the supporting column 13 in structure, and the sliding pin 12 is identical to the sliding groove I14 and the sliding groove II 15 in shape.
The fingertip sealing sheet 5 has a thickness of 1mm. The axial thickness of the brush filaments 7 in the rear baffle 8 is not more than 1mm.
The clearance between the bottom end of the comb seal 3 and the rotor shaft is 0.8 mm, the clearance between the bottom of the fingertip seal piece 5 and the rotor shaft is 0.2 mm, and the clearance between the brush wire 7 and the rotor shaft is 0.1 mm. The number of fingertip sealing sheets 5 between the front baffle 4 and the baffle 6 is 6.
Example 3: as shown in fig. 1-11, a flexible sealing device comprises an upper sealing seat 1, a lower sealing seat 2, a comb tooth sealing piece 3, a front baffle plate 4, a fingertip sealing piece 5, a baffle plate 6, brush wires 7, a rear baffle plate 8 and a flexible supporting piece 9; the upper sealing seat 1 and the lower sealing seat 2 are internally provided with a mounting groove I29, the comb tooth sealing piece 3 is attached with a flexible supporting piece 9 and is mounted in the mounting groove I29 of the lower sealing seat 2, a plurality of fingertip sealing pieces 5 are mounted between the front baffle 4 and the partition plate 6 in a clamping manner, the front baffle 4 is attached with the upper part of the comb tooth sealing piece 3 and the flexible supporting piece 9, the front baffle 4, the fingertip sealing pieces 5 and the partition plate 6 are mounted in the mounting groove I29 of the lower sealing seat 2, the brush wires 7 are fixedly mounted in the rear baffle 8, one side of the rear baffle 8 is attached with the partition plate 6 and is mounted in the mounting groove I29 of the lower sealing seat 2, the upper sealing seat 1 is fixedly mounted on the lower sealing seat 2, the comb tooth sealing piece 3, The front baffle plate 4, the fingertip sealing piece 5, the baffle plate 6, the brush wires 7, the rear baffle plate 8 and the flexible supporting piece 9 are all positioned in a placement groove I29 of the upper sealing seat 1, the other side of the rear baffle plate 8 is attached to the inner walls of the upper sealing seat 1 and the lower sealing seat 2, threaded holes 23 are formed in the upper sealing seat 1 and the lower sealing seat 2, and the flexible supporting piece 9 comprises a thrust plate 10, a supporting spring 11, a sliding pin 12 and a supporting column 13; the lower part of the support column 13 is provided with a chute II 15, the upper part of the support column 13 is externally provided with an external thread 28, the boosting plate 10 is of an arc plate structure, the arc plate is provided with a support cylinder 30, the support cylinder 30 is provided with a chute I14, a sliding pin 12 penetrates through the chute II 15 at the lower part of the support column 13, the lower part of the support column 13 is connected with the chute I14 on the support cylinder 30 in a matched manner through the sliding pin 12, the other end of the support column 13 is connected with a threaded hole 23 in a matched manner through the external thread 28 and the threaded hole 23 and is arranged in a setting groove I29 of the upper sealing seat 1 and the lower sealing seat 2, the support spring 11 is positioned in the support cylinder 30, one end of the support spring 11 is attached to the boosting plate 10, the other end of the supporting spring 11 is propped against the lower part of the sliding pin 12, one end of the supporting column 13 is positioned in the supporting spring 11, the outer part of the comb tooth sealing piece 3 is attached to the boosting plate 10 of the flexible supporting piece 9, one side of the comb tooth sealing piece 3 is attached to the inner cavity walls of the upper sealing seat 1 and the lower sealing seat 2, through holes 24 are uniformly formed in each fingertip sealing piece 5, a pressure release groove I20 is formed in the baffle plate 6, an air vent groove 19 is formed in one side of the baffle plate 6 attached to the fingertip sealing piece 5, a compression spring 16 is arranged in the air vent groove 19, a spring supporting plate 18 is connected and arranged at the other end of the compression spring 16, the compression springs 16 are all positioned in the air vent groove 19, the shape and the structure of the spring supporting plate 18 are the same as those of the ventilation groove 19, the spring supporting plate 18 is attached to the fingertip sealing plates 5, the center position of the spring supporting plate 18 is the same as the position of the through hole 24 of the fingertip sealing plate 5, the front baffle plate 4 is provided with a fixing Kong, each fingertip sealing plate 5 is uniformly provided with a fixing hole II 25, the baffle plate 6 is provided with a fixing hole I22, the fingertip sealing plates 5 are clamped and installed between the front baffle plate 4 and the baffle plate 6 through the fixing Kong, the fixing holes II 25 and the fixing holes I22, the front baffle plate 4 is of an annular structure, the inner diameter of the front baffle plate 4 is larger than that of the fingertip sealing plates 5, a cavity is formed between the fingertip sealing plates 5 and the other side of the comb tooth sealing piece 3, a mounting groove II 21 is formed in one side of the rear baffle plate 8, a pressure relief groove II 26 is formed in the rear baffle plate 8 at the position of the mounting groove II 21, the brush wires 7 are fixedly arranged in the mounting groove II 21 of the rear baffle plate 8, a fixing hole III 27 is formed in the rear baffle plate 8, and the rear baffle plate 8 is connected with the partition plate 6 through the fixing hole III 27.
The upper sealing seat 1 and the lower sealing seat 2 have the same structure. The sliding groove I14 of the supporting cylinder 30 is identical to the sliding groove II 15 of the supporting column 13 in structure, and the sliding pin 12 is identical to the sliding groove I14 and the sliding groove II 15 in shape.
The fingertip sealing sheet 5 has a thickness of 0.4mm. The axial thickness of the brush filaments 7 in the rear baffle 8 is not more than 1.2 mm.
The gap between the bottom end of the comb seal 3 and the rotor shaft is 1.2 mm, the gap between the bottom of the fingertip seal piece 5 and the rotor shaft is 0.35 mm, and the gap between the brush wire 7 and the rotor shaft is 0.2 mm. The number of fingertip sealing sheets 5 between the front baffle 4 and the partition plate 6 is 9.
Claims (7)
1. A flexible sealing device, characterized in that: the device comprises an upper sealing seat (1), a lower sealing seat (2), a comb tooth sealing piece (3), a front baffle plate (4), a fingertip sealing piece (5), a baffle plate (6), brush wires (7), a rear baffle plate (8) and a flexible supporting piece (9); the upper sealing seat (1) and the lower sealing seat (2) are internally provided with a mounting groove I (29), the comb tooth sealing member (3) is attached with a flexible supporting member (9) and is mounted in the mounting groove I (29) of the lower sealing seat (2), a plurality of fingertip sealing sheets (5) are clamped and mounted between the front baffle plate (4) and the baffle plate (6), the front baffle plate (4) is attached with the upper part of the comb tooth sealing member (3) and the flexible supporting member (9), the front baffle plate (4), the fingertip sealing sheets (5) and the baffle plate (6) are mounted in the mounting groove I (29) of the lower sealing seat (2), the brush wire (7) is fixedly mounted in the rear baffle plate (8), one side of the rear baffle plate (8) is attached with the baffle plate (6) and is mounted in the mounting groove I (29) of the lower sealing seat (2), the upper sealing seat (1) is fixedly arranged on the lower sealing seat (2), the comb tooth sealing piece (3), the front baffle plate (4), the fingertip sealing piece (5), the baffle plate (6), the brush wires (7), the rear baffle plate (8) and the flexible supporting piece (9) are all positioned in the arranging groove I (29) of the upper sealing seat (1), the other side of the rear baffle plate (8) is attached to the inner walls of the upper sealing seat (1) and the lower sealing seat (2), threaded holes (23) are formed in the upper sealing seat (1) and the lower sealing seat (2), and the flexible supporting piece (9) comprises a push assisting plate (10), a supporting spring (11), a sliding pin (12) and a supporting column (13); a chute II (15) is arranged at the lower part of the support column (13), an external thread (28) is arranged at the upper part of the support column (13) in an outward way, the thrust-assisting plate (10) is of an arc-shaped plate structure, a support cylinder (30) is arranged on the arc-shaped plate, a chute I (14) is arranged on the support cylinder (30), a sliding pin (12) penetrates through the chute II (15) at the lower part of the support column (13), the lower part of the support column (13) is connected to the support cylinder (30) in a matched way through the sliding pin (12) and the chute I (14), the other end of the support column (13) is connected to the threaded hole (23) in a matched way and is arranged in the arranging grooves I (29) of the upper sealing seat (1) and the lower sealing seat (2), the supporting spring (11) is positioned in the supporting cylinder (30), one end of the supporting spring (11) is attached to the boosting plate (10), the other end of the supporting spring (11) is propped against the lower part of the sliding pin (12), one end of the supporting column (13) is positioned in the supporting spring (11), the outer part of the comb tooth sealing piece (3) is attached to the boosting plate (10) of the flexible supporting piece (9), one side of the comb tooth sealing piece (3) is attached to the inner cavity walls of the upper sealing seat (1) and the lower sealing seat (2), through holes (24) are uniformly formed in each fingertip sealing piece (5), a pressure relief groove I (20) is formed in the partition plate (6), a ventilation groove (19) is formed in one side of the partition plate (6) attached to the fingertip sealing piece (5), a compression spring (16) is arranged in the ventilation groove (19), a spring supporting plate (18) is connected and arranged at the other end of the compression spring (16), the compression spring (16) is positioned in the ventilation groove (19), the shape and the structure of the spring supporting plate (18) are the same as those of the ventilation groove (19), the spring supporting plate (18) is attached to the fingertip sealing plate (5), the center position of the spring supporting plate (18) is the same as the position of a through hole (24) of the fingertip sealing plate (5), a fixing Kong (17) is arranged on the front baffle plate (4), a fixing hole II (25) is uniformly arranged on each fingertip sealing plate (5), a fixing hole I (22) is arranged on the baffle plate (6), a plurality of fingertip sealing sheets (5) are clamped and installed between a front baffle plate (4) and a baffle plate (6) through a fixing Kong (17), a fixing hole II (25) and a fixing hole I (22), the front baffle plate (4) is of an annular structure, the inner diameter of the front baffle plate (4) is larger than that of the fingertip sealing sheets (5), a cavity is formed between the fingertip sealing sheets (5) and the other side of the comb tooth sealing piece (3), a placement groove II (21) is formed in one side of a rear baffle plate (8), a pressure release groove II (26) is formed in the rear baffle plate (8) at the placement groove II (21), brush wires (7) are fixedly installed in the placement groove II (21) of the rear baffle plate (8), a fixing hole III (27) is formed in the rear baffle plate (8), the rear baffle (8) is connected with the baffle plate (6) through a fixing hole III (27).
2. The flexible sealing device of claim 1, wherein: the upper sealing seat (1) and the lower sealing seat (2) have the same structure.
3. The flexible sealing device of claim 1, wherein: the sliding groove I (14) of the supporting cylinder (30) and the sliding groove II (15) of the supporting column (13) are identical in structure size, and the sliding pin (12) is identical in appearance size to the sliding groove I (14) and the sliding groove II (15).
4. The flexible sealing device of claim 1, wherein: the thickness of the fingertip sealing sheet (5) is 0.1-2.4 mm.
5. The flexible sealing device of claim 1, wherein: the axial thickness of the brush filaments (7) in the rear baffle (8) is smaller than 1.6mm.
6. The flexible sealing device of claim 1, wherein: the gap between the bottom end of the comb tooth sealing piece (3) and the rotor shaft is 0.3-1.2 mm, the gap between the bottom of the fingertip sealing piece (5) and the rotor shaft is 0.05-0.4 mm, and the gap between the brush wire (7) and the rotor shaft is 0.01-0.2 mm.
7. The flexible sealing device of claim 1, wherein: the number of fingertip sealing sheets (5) between the front baffle plate (4) and the baffle plate (6) is 3-15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141885.7A CN112648019B (en) | 2021-02-02 | Flexible sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110141885.7A CN112648019B (en) | 2021-02-02 | Flexible sealing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112648019A CN112648019A (en) | 2021-04-13 |
| CN112648019B true CN112648019B (en) | 2024-06-07 |
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