CN214578838U - Balanced seal structure of turboexpander main shaft - Google Patents
Balanced seal structure of turboexpander main shaft Download PDFInfo
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- CN214578838U CN214578838U CN202120659126.5U CN202120659126U CN214578838U CN 214578838 U CN214578838 U CN 214578838U CN 202120659126 U CN202120659126 U CN 202120659126U CN 214578838 U CN214578838 U CN 214578838U
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Abstract
The utility model discloses a main shaft balance sealing structure of a turbine expansion machine, which comprises a main shaft arranged in a casing, wherein a sealing bush is sleeved at the end part of the main shaft, a stepped shaft seal is sleeved at the outer side of the sealing bush, and an inner sealing tooth is arranged between the outer side surface of the sealing bush and the inner side surface of the stepped shaft seal; a high sealing tooth is arranged between the outer side elevation of the stepped shaft seal and the casing, and a low sealing tooth is arranged between the outer side low range of the stepped shaft seal and the casing; a pressure inclined plane inclined towards the elevation of the stepped shaft seal is also arranged on the outer side surface formed by sealing, and an extrusion inclined plane attached to the pressure inclined plane is arranged on the inner side surface of the stepped shaft seal; the utility model discloses have the beneficial effect who improves the leakproofness between main shaft and the seal bush greatly.
Description
Technical Field
The utility model belongs to the technical field of turboexpander main shaft seal structure, concretely relates to balanced seal structure of turboexpander main shaft.
Background
Because the bearings adopted by the turbo expander are a pair of integral sliding oil bearings, shaft seal devices are usually arranged on bearing seats at two ends of a rotating shaft, but because the existing shaft seal devices lack effective seal structures, large leakage gaps are easily formed at the shaft seals under the condition of long-term high-speed operation, so that the cold quantity at the back of a working wheel is leaked outwards, lubricating oil is easily made to enter a medium, and the practical service life of equipment is shortened. The shaft seal structure is directly arranged on the outer side of the main shaft in time, and after long-term use, along with abrasion of the shaft seal, the problem that the sealing performance between the shaft seal and the main shaft is reduced can also occur.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a balanced seal structure of turboexpander main shaft realizes balancing effectual sealedly to the main shaft of turboexpander.
The utility model discloses a following technical scheme realizes:
a main shaft balance sealing structure of a turbo expander comprises a main shaft arranged in a shell, wherein a sealing bush is sleeved at the end part of the main shaft, a stepped shaft seal is sleeved at the outer side of the sealing bush, and an inner sealing tooth is arranged between the outer side surface of the sealing bush and the inner side surface of the stepped shaft seal; a high sealing tooth is arranged between the outer side elevation of the stepped shaft seal and the casing, and a low sealing tooth is arranged between the outer side low range of the stepped shaft seal and the casing; the outer side surface of the step shaft seal is also provided with a pressure-bearing inclined surface inclined towards the elevation of the step shaft seal, and the inner side surface of the step shaft seal is provided with an extrusion inclined surface attached to the pressure-bearing inclined surface.
The height of the step shaft seal refers to the outer side surface of the large-diameter end of the step shaft seal, and the low distance of the step crest refers to the outer side surface of the small-diameter end of the step shaft seal. The shaft end of the main shaft is sleeved with a sealing bush, and an inner sealing tooth is arranged between the inner side surface of the sealing bush and the side surface of the main shaft to form inner sealing. Meanwhile, a high sealing tooth is arranged between the height of the stepped shaft seal sleeved on the outer side of the sealing bush and the inner side surface of the casing to form height sealing, and a low sealing tooth is arranged between the low range of the stepped shaft seal and the inner side surface of the casing to form low range sealing. Meanwhile, due to the fact that the height difference exists between the high seal teeth and the low seal teeth, when high-pressure gas enters the space between the high seal teeth and the low seal teeth through the air holes or the air passages in the casing, pressure which is extruded towards the elevation of the stepped shaft seal along the axial direction of the spindle can be generated, the stepped shaft seal further tends to move towards the elevation in the axial direction, the extrusion inclined surface on the inner side surface of the stepped shaft seal extrudes the compression inclined surface on the outer side surface of the seal bushing, the seal bushing is attached to the spindle more tightly, and the sealing effect is further guaranteed.
In order to better realize the utility model discloses, furtherly, be provided with the labyrinth seal tooth between the medial surface of seal bush's lateral surface and ladder bearing seal.
In order to better realize the utility model discloses, furtherly, be provided with air gap along the axial between high sealed tooth and the low sealed tooth.
In order to better realize the utility model discloses, furtherly, be provided with on the casing with the inflation channel of inflation clearance intercommunication.
In order to better realize the utility model discloses, furtherly, all be provided with the sealing member between the medial surface of seal bush and the side of main shaft and between the medial surface of ladder bearing seal and the side of main shaft.
For better realization the utility model discloses, furtherly, the cover is equipped with bearing and oil scraper ring on the one side that the main shaft was located the axle head that sealed bush kept away from the main shaft.
In order to better realize the utility model discloses, furtherly, be provided with sealed tooth between the medial surface of bearing and the side of main shaft.
In order to better realize the utility model discloses, furtherly, be provided with the regulation clearance between the terminal surface of oil scraper ring and ladder bearing seal.
In order to better realize the utility model, furthermore, the axial width of the adjusting gap is 0.5mm-1.5 mm.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
(1) the utility model has the advantages that the sealing bush is directly sleeved on the shaft end of the main shaft, the inner sealing teeth are arranged between the inner side surface of the sealing bush and the side surface of the main shaft, and the effective sealing between the inner side surface of the sealing bush and the side surface of the main shaft is realized through the inner sealing teeth; meanwhile, a stepped shaft seal is sleeved on the outer side of the sealing bush, a high sealing tooth is arranged between the outer side elevation of the stepped shaft seal and the inner side surface of the machine shell, and a low sealing tooth is arranged between the outer side low range of the stepped shaft seal and the inner side surface of the machine shell, so that the sealing property between the outer side surface of the stepped shaft seal and the inner side surface of the machine shell is ensured;
(2) the utility model discloses an extrusion inclined plane towards elevation slope on the medial surface of ladder bearing seal, set up the pressurized inclined plane of laminating with the extrusion inclined plane on the lateral surface of seal bushing, because there is the difference in height between the elevation of ladder bearing seal and the low range, therefore the elevation terminal surface of ladder bearing seal receives when aerifing axial pressure, make ladder bearing seal produce the trend of axial displacement, and then drive the extrusion inclined plane and produce the extrusion to the pressurized inclined plane, and then make the laminating between the medial surface of ladder bearing seal and the lateral surface of seal bushing inseparabler, make the laminating between the medial surface of seal bushing and the side of main shaft inseparabler simultaneously, even the seal bushing takes place slight wearing and tearing, can guarantee the seal bushing under the effect of extrusion force, ladder bearing seal, leakproofness between the main shaft; when the sealing bush is seriously abraded, only the inner sealing bush needs to be replaced, and the stepped shaft seal does not need to be replaced, so that the maintenance cost is greatly reduced;
(3) the utility model discloses a set up the labyrinth seal tooth between the medial surface of ladder bearing seal and seal bushing's lateral surface, further guaranteed the leakproofness between ladder bearing seal and the seal bushing binding face.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a partially enlarged view of fig. 1.
Wherein: 1-a main shaft; 2-sealing the bushing; 3-step shaft seal; 01-inner seal teeth; 02-high seal teeth; 03-low seal teeth; 04-labyrinth seal teeth.
Detailed Description
Example 1:
as shown in fig. 1 and 2, the main shaft balance sealing structure of the turboexpander in the present embodiment includes a main shaft 1 disposed inside a casing, a sealing bush 2 is sleeved on an end portion of the main shaft 1, a stepped shaft seal 3 is sleeved on an outer side of the sealing bush 2, and an inner sealing tooth 01 is disposed between an outer side surface of the sealing bush 2 and an inner side surface of the stepped shaft seal 3; a high sealing tooth 02 is arranged between the outer side elevation of the stepped shaft seal 3 and the casing, and a low sealing tooth 03 is arranged between the outer side low range of the stepped shaft seal 3 and the casing; the outer side surface of the sealing bush 2 is also provided with a pressure-bearing inclined surface inclined towards the elevation of the stepped shaft seal 3, and the inner side surface of the stepped shaft seal 3 is provided with an extrusion inclined surface attached to the pressure-bearing inclined surface.
The end part of the main shaft 1 is sleeved with a sealing bush 2, an inner sealing tooth 01 is arranged between the inner side surface of the sealing bush 2 and the outer side surface of the main shaft 1, the axial length of the inner sealing tooth 01 is more than or equal to the axial length of two-thirds of the sealing bush 2, and sealing between the inner side surface of the sealing bush 2 and the side surface of the main shaft 1 is realized through the inner sealing tooth 01.
The outside cover of sealing bush 2 is equipped with ladder bearing seal 3, is provided with high sealed tooth 02 between the medial surface of the outside elevation of ladder bearing seal 3 and the casing, is provided with low sealed tooth 02 between the medial surface of the outside low range of ladder bearing seal 3 and the casing, and the outside low range of ladder bearing seal 3 is close to the axle head setting, and the axle head setting is kept away from to the outside elevation of ladder bearing seal 3, and does not follow the axial and complete contact between the medial surface of casing and the outside low range of ladder bearing seal 3, but reserves the punching press space.
High-pressure gas is filled into the stamping space through the air holes or the air passages on the machine shell, and because the height difference exists between the elevation and the low range of the stepped shaft seal 3, the high-pressure gas acts on the end surface of the elevation, and further axial pressure along the axial extrusion elevation is generated. Under the action of the axial pressure, due to the meshing structure of the elevation sealing teeth 02 and the low-range sealing teeth 03, the stepped shaft seal 3 does not actually move along the axial direction, but the stepped shaft seal 3 tends to move along the axial direction. And then make the extrusion inclined plane towards elevation slope on the 3 medial surfaces of ladder bearing seal extrude the pressurized inclined plane on the lateral surface of sealing bush 2 for the medial surface of ladder bearing seal 3 and the lateral surface contact of sealing bush 2 are inseparabler, make simultaneously contact inseparabler between the medial surface of sealing bush 2 and the side of main shaft 1, and then improved the leakproofness greatly.
Example 2:
the embodiment is further optimized on the basis of the embodiment 1, the labyrinth seal teeth 04 are arranged between the outer side surface of the seal bushing 2 and the inner side surface of the stepped shaft seal 3, and the labyrinth seal teeth 04 are arranged, so that the sealing performance between the outer side surface of the seal bushing 2 and the inner side surface of the stepped shaft seal 3 can be still effectively ensured even if the stepped shaft seal 3 is not under the action of axial pressure.
Further, the axial length of the labyrinth seal teeth is greater than or equal to one half of the axial length of the stepped shaft seal 3.
Other parts of this embodiment are the same as embodiment 1, and thus are not described again.
Example 3:
the present embodiment is further optimized based on embodiment 1 or 2, as shown in fig. 2, an inflation gap is axially disposed between the high seal tooth 02 and the low seal tooth 03, and an inflation channel communicated with the inflation gap is disposed on the casing.
High-pressure gas is filled into the inflation gap through an inflation channel on the casing by adopting external inflation equipment, so that pressure P is generated on the elevation end face of the stepped shaft seal 3, meanwhile, the elevation end face area of the stepped shaft seal 3 is S, the axial pressure F = PxS acting on the elevation end face of the stepped shaft seal 3 can be calculated, and the pressure P is adjusted by adjusting the inflation quantity and the flow rate of the external inflation equipment, so that the adjustment of the axial pressure F is finally realized.
The rest of this embodiment is the same as embodiment 1 or 2, and therefore, the description thereof is omitted.
Example 4:
in this embodiment, a further optimization is performed on the basis of any one of the embodiments 1 to 3, wherein sealing members are respectively disposed between the inner side surface of the sealing bush 2 and the side surface of the main shaft 1 and between the inner side surface of the stepped shaft seal 3 and the side surface of the main shaft 1, and the sealing property between the inner side surface of the sealing bush 2 and the side surface of the main shaft 1 and the sealing property between the inner side surface of the stepped shaft seal 3 and the side surface of the main shaft 1 are further ensured by the sealing members.
Further, the sealing element is an O-shaped elastic sealing ring.
Other parts of this embodiment are the same as any of embodiments 1 to 3, and thus are not described again.
Example 5:
the present embodiment is further optimized on the basis of any one of the above embodiments 1 to 4, wherein a bearing is sleeved on one side of the main shaft 1, which is located at the shaft end of the seal bush 2, which is far away from the main shaft 1, and an oil slinger is sleeved between the bearing and the stepped shaft seal 3.
Be provided with the oiling passageway on the bearing lateral wall, supply lubricating oil to bearing department through the oiling passageway, and then realize the lubrication to the bearing, shelter from lubricating oil through keeping off the oil ring simultaneously, avoid lubricating oil to leak.
And sealing teeth are arranged between the inner side surface of the bearing and the side surface of the main shaft 1, so that the sealing property between the inner side surface of the bearing and the side surface of the main shaft is ensured.
Other parts of this embodiment are the same as any of embodiments 1 to 4, and thus are not described again.
Example 6:
the present embodiment is further optimized on the basis of any one of the embodiments 1 to 5, wherein an adjusting gap is provided between the slinger and the end surface of the stepped shaft seal 3, and the axial distance between the slinger and the end surface of the stepped shaft seal 3 can be adjusted in the axial direction by setting the adjusting gap.
Further, the axial width of the adjusting gap is 0.5mm-1.5 mm.
Other parts of this embodiment are the same as any of embodiments 1 to 5, and thus are not described again.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (9)
1. A main shaft balance sealing structure of a turbo expander comprises a main shaft (1) arranged in a shell, and is characterized in that a sealing bush (2) is sleeved at the end part of the main shaft (1), a stepped shaft seal (3) is sleeved at the outer side of the sealing bush (2), and an inner sealing tooth (01) is arranged between the outer side surface of the sealing bush (2) and the inner side surface of the stepped shaft seal (3); a high sealing tooth (02) is arranged between the outer side elevation of the stepped shaft seal (3) and the casing, and a low sealing tooth (03) is arranged between the outer side low range of the stepped shaft seal (3) and the casing; the outer side surface of the sealing bush (2) is also provided with a pressure inclined surface inclined towards the elevation of the stepped shaft seal (3), and the inner side surface of the stepped shaft seal (3) is provided with an extrusion inclined surface attached to the pressure inclined surface.
2. The main shaft balance seal structure of the turboexpander according to claim 1, characterized in that labyrinth teeth (04) are provided between the outer side surface of the seal bushing (2) and the inner side surface of the stepped shaft seal (3).
3. The main shaft balance seal structure of the turboexpander according to claim 2, characterized in that an air inflation gap is axially arranged between the high seal teeth (02) and the low seal teeth (03).
4. The balanced seal arrangement of the main shaft of the turboexpander as claimed in claim 3, wherein the casing is provided with an inflation channel communicating with the inflation gap.
5. The main shaft balance sealing structure of the turboexpander according to any one of claims 1 to 4, wherein a seal is provided between the inner side surface of the seal bushing (2) and the side surface of the main shaft (1) and between the inner side surface of the stepped shaft seal (3) and the side surface of the main shaft (1).
6. The main shaft balance sealing structure of the turboexpander is characterized in that a bearing and an oil retainer ring are sleeved on one side of the main shaft (1) which is positioned at the end of the sealing bush (2) far away from the main shaft (1).
7. The main shaft balance seal structure of the turboexpander according to claim 6, characterized in that seal teeth are provided between the inner side surface of the bearing and the side surface of the main shaft (1).
8. The main shaft balance seal structure of the turboexpander according to claim 6, characterized in that an adjusting clearance is provided between the oil slinger and the end face of the stepped shaft seal (3).
9. The balanced seal arrangement of the main shaft of the turboexpander according to claim 8, wherein the axial width of the adjustment gap is 0.5mm to 1.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120659126.5U CN214578838U (en) | 2021-03-31 | 2021-03-31 | Balanced seal structure of turboexpander main shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120659126.5U CN214578838U (en) | 2021-03-31 | 2021-03-31 | Balanced seal structure of turboexpander main shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214578838U true CN214578838U (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120659126.5U Active CN214578838U (en) | 2021-03-31 | 2021-03-31 | Balanced seal structure of turboexpander main shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214578838U (en) |
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2021
- 2021-03-31 CN CN202120659126.5U patent/CN214578838U/en active Active
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