CN219691802U - Centrifugal air compressor sealing structure capable of reducing axial force - Google Patents
Centrifugal air compressor sealing structure capable of reducing axial force Download PDFInfo
- Publication number
- CN219691802U CN219691802U CN202320318688.2U CN202320318688U CN219691802U CN 219691802 U CN219691802 U CN 219691802U CN 202320318688 U CN202320318688 U CN 202320318688U CN 219691802 U CN219691802 U CN 219691802U
- Authority
- CN
- China
- Prior art keywords
- impeller
- seal
- air compressor
- hole
- tooth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 24
- 238000010992 reflux Methods 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims 2
- 230000008676 import Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 3
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model discloses a centrifugal air compressor sealing structure capable of reducing axial force, which is arranged on a centrifugal air compressor with an impeller and a rear side plate positioned at the rear side of the impeller, and comprises a first tooth part and a second tooth part, wherein the first tooth part is provided with annular first teeth fixedly arranged at the rear side of the impeller, the second tooth part is provided with annular second teeth fixedly arranged at the front side of the rear side plate, the first tooth part and the second tooth part are arranged in a staggered manner along the radial direction of the impeller, and the first tooth and the second tooth are in clearance fit; the centrifugal air compressor sealing structure capable of reducing the axial force can effectively reduce the axial force, and has the advantages of simple structure, easy processing, low cost and convenient installation and operation.
Description
Technical Field
The utility model relates to the technical field of centrifugal air compressors, in particular to a centrifugal air compressor sealing structure capable of reducing axial force.
Background
In order to reduce leakage of compressed air, a shaft seal is required to be arranged between a rotating shaft and a fixing piece of the centrifugal air compressor, and the shaft seal usually adopts a labyrinth seal, a carbon ring seal and a mechanical seal. When the centrifugal air compressor operates, the pressure difference at two sides of the impeller is large, and large axial force can be generated, so that the operation stability of the air compressor is poor. The balance disc is generally adopted to reduce the axial force, the rest axial force is borne by the thrust disc, or the large thrust disc is directly adopted to bear the axial force, so that the stable operation of the air compressor is ensured, and the cost is high.
Disclosure of Invention
The utility model aims to overcome the defects, and provides the centrifugal air compressor sealing structure capable of reducing the axial force, which can effectively reduce the axial force generated by the pressure difference at two sides of the impeller, and has the advantages of simple structure, easy processing, low cost and convenient installation and operation.
The utility model provides a centrifugal air compressor sealing structure capable of reducing axial force, which is arranged on a centrifugal air compressor with an impeller and a rear side plate positioned at the rear side of the impeller.
Further, the first tooth part is provided with a plurality of first teeth which are sequentially arranged along the radial direction of the impeller, the second tooth part is provided with a plurality of second teeth which are sequentially arranged along the radial direction of the rear side plate, the plurality of first teeth and the plurality of second teeth are staggered along the radial direction of the impeller, and gaps are reserved between tooth surfaces of the first teeth and adjacent second teeth.
Further, the plurality of first teeth are arranged at equal intervals along the radial direction of the impeller, and the plurality of second teeth are arranged at equal intervals along the radial direction of the rear side plate.
Further, the centrifugal air compressor further comprises a shaft sleeve fixedly sleeved on the outer side of an impeller shaft of the centrifugal air compressor and a shaft seal sleeved on the outer side of the shaft sleeve, the front side of the shaft seal is fixedly arranged on the rear side of the rear side plate, a high-pressure area is formed between the shaft seal and the impeller, a backflow through hole communicated with the high-pressure area is formed in the shaft seal, and the air outlet end of the backflow through hole is communicated with the front side inlet of the impeller through a backflow pipe.
Further, a guide ring positioned at the front side of the impeller is fixedly arranged in the centrifugal air compressor, an air inlet through hole communicated with the front side inlet of the impeller is formed in the guide ring, and the other end of the return pipe, which is far away from the return through hole, is connected and communicated with the air inlet through hole.
Further, the air inlet end of the return pipe is connected with the air outlet end of the return through hole through the first flange, a connecting pipe which is connected and communicated with the air inlet end of the air inlet through hole is fixedly arranged on the guide ring, and the connecting pipe is connected with the air outlet end of the return pipe through the second flange.
Further, the shaft seal is labyrinth seal, the inner side of the labyrinth seal is fixedly provided with a sealing tooth part, a sealing space is formed between the sealing tooth part and the shaft sleeve, an exhaust through hole is formed in the labyrinth seal, the air inlet end of the exhaust through hole is communicated with the rear end part of the sealing space, and the outlet end of the exhaust through hole is connected to the outside of a room through an exhaust pipe.
Further, the seal tooth part is provided with a plurality of seal teeth which are sequentially arranged along the axial direction of the labyrinth seal, and the air inlet end of the exhaust through hole is positioned between the second seal tooth and the third seal tooth at the rear end of the labyrinth seal.
Further, the exhaust pipe is connected with the outlet end of the exhaust through hole through a third flange.
The beneficial effects of the utility model are as follows: compared with the prior art adopting the form of the balance disc and the thrust disc, the centrifugal air compressor sealing structure capable of reducing the axial force has the advantages that the generated axial force is smaller, the running stability of the centrifugal air compressor is improved, the balance disc or the large thrust disc is not needed, and the cost of the air compressor is effectively reduced.
Drawings
Fig. 1 is a schematic structural view of a centrifugal air compressor seal structure capable of reducing axial force according to an embodiment of the present utility model;
FIG. 2 is an enlarged partial view of portion A of FIG. 1;
FIG. 3 is a side view of a labyrinth seal in an embodiment of the utility model.
In the figure, 1 is a blade; 2 is a wheel disc; 3 is a rear side plate; 4 is an O-shaped sealing ring; 5 is labyrinth seal; 6 is a shaft sleeve; 7 is an impeller shaft; 8 is a third flange; 9 is an exhaust pipe; 10 is a first flange; 11 is a return pipe; 12 is a second flange; 13 is a connecting pipe; 14 is a guide ring; 15 is a first tooth; 16 is a second tooth; 17 is a seal tooth; and 18 is a jacking threaded hole.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Fig. 1 is a schematic structural diagram of a centrifugal air compressor seal structure capable of reducing axial force in an embodiment of the utility model.
As shown in fig. 1, the centrifugal air compressor has a casing, a half-open impeller, an impeller shaft 7, a rear side plate 3, and a guide ring 14. The impeller shaft 7 is rotatably mounted within the housing. The semi-open impeller is coaxially and fixedly arranged on the impeller shaft 7 and is formed by welding a plurality of blades 1 and an impeller wheel disc 2 into a whole or integrally milling. The rear side plate 3 is positioned at the rear side of the impeller and is fixedly mounted on the casing. The guide ring 14 is located at the front side of the impeller and is fixedly arranged on the casing.
Fig. 2 is a partial enlarged view of a portion a in fig. 1.
As shown in fig. 1 and 2, a centrifugal air compressor seal structure capable of reducing axial force in this embodiment includes a first tooth portion, a second tooth portion, a sleeve 6, a shaft seal, a return pipe 11, a connection pipe 13, and an exhaust pipe 9.
The first tooth portion includes a plurality of annular first teeth 15 of equal size spaced apart along the radial direction of the impeller. Each first tooth 15 is fixedly arranged at the rear side of the impeller wheel disc 2, one side surface of the first tooth is a plane, and the other side surface of the first tooth is an inclined plane.
The second tooth portion includes a plurality of annular second teeth 16 which are arranged at equal intervals in the radial direction of the rear side plate 3 and have the same shape as the first teeth 15. Each second tooth 16 is fixedly provided on the front side of the rear side plate 3. The plurality of first teeth 15 and the plurality of first teeth 15 are arranged in a one-to-one staggered manner along the radial direction of the impeller, each first tooth 15 and the adjacent second tooth 16 are arranged in an inclined plane-to-inclined plane and plane-to-plane manner, and the tooth surfaces of the first teeth 15 and the adjacent second teeth 16 are in clearance fit, so that the impeller wheel disc 2 and the rear side plate 3 are prevented from rubbing when the centrifugal air compressor runs.
The shaft sleeve 6 is fixedly sleeved on the outer side of the impeller shaft 7 of the centrifugal air compressor, and the shaft sleeve 6 is in interference fit with the impeller shaft 7. The shaft sleeve 6 is made of high-strength corrosion-resistant materials, and if the shaft sleeve 6 is found to be worn during maintenance, the shaft sleeve 6 is only required to be replaced, so that the cost is low.
FIG. 3 is a side view of a labyrinth seal in an embodiment of the utility model.
As shown in fig. 1 to 3, the shaft seal is a labyrinth seal 5 which is fitted over the outside of the sleeve 6 and fixedly mounted on the rear side of the rear side plate 3 by fastening bolts. In design, the expansion amounts of the shaft sleeve 6 and the labyrinth seal 5 are calculated, so that the gap between the sealing teeth 17 and the shaft sleeve 6 is ensured to be as small as possible, the sealing teeth 17 and the shaft sleeve 6 do not collide with each other, and the gas leakage amount is small. An O-shaped sealing ring 4 is arranged between the shaft seal and the rear side plate 3. The labyrinth seal 5 is supported by aluminum alloy, and is easy to process and low in cost. The labyrinth seal 5 adopts an up-down split structure, so that the installation and the overhaul are convenient. Four jacking screw holes 18 are formed in the labyrinth seal 5 at equal intervals in the circumferential direction of the labyrinth seal 5, and the labyrinth seal 5 can be conveniently and rapidly jacked out of the rear side plate 3 by screwing jacking bolts into the jacking screw holes 18. A high pressure area is formed between the shaft seal and the impeller disc 2. The shaft seal is provided with a reflux through hole communicated with the high-pressure area. The inner side of the labyrinth seal 5 is fixedly provided with a seal tooth portion. The seal tooth portion has a plurality of seal teeth 17 which are uniformly arranged in the axial direction of the labyrinth seal 5 and are equal in size. The sealing teeth 17 are flat on one side facing the impeller and beveled on the other side. A plurality of seal teeth 17 form a seal space with the sleeve 6. The labyrinth seal 5 is formed with an exhaust through hole, and an air inlet end of the exhaust through hole is positioned between the second seal tooth 17 and the third seal tooth 17 at the rear end of the labyrinth seal 5. The inlet end of the exhaust through hole is communicated with the rear end part of the sealing space.
The air inlet end of the return pipe 11 is connected and communicated with the air outlet end of the return through hole through the first flange 10 and the sealing gasket.
The guide ring 14 is provided with an air inlet through hole communicated with the front inlet of the impeller. The connecting pipe 13 is fixedly arranged on the guide ring 14 and is connected and communicated with the air inlet end of the air inlet through hole. The connecting pipe 13 is connected with the air outlet end of the return pipe 11 through the second flange 12 and the sealing gasket.
The exhaust pipe 9 is connected with the outlet end of the exhaust through hole through a third flange 8 and a sealing gasket, and the air outlet end is connected to the outside of the room. After the gas in the high pressure area passes through the sealing teeth 17, a very small amount of low pressure air is led to the outside of the room through the third flange 8 and the exhaust pipe 9.
The principle that can reduce axial force of this embodiment's centrifugal air compressor machine seal structure can reduce axial force is: the outlet pressure of the semi-open impeller is far higher than that of the inlet, and after the first teeth 15 and the second teeth 16 are matched and sealed, the pressure between the impeller wheel disc 2 and the labyrinth seal 5 can be reduced. A small amount of air flows to the inlet of the semi-open impeller through the backflow through hole of the labyrinth seal 5 and the backflow pipe 11, so that the pressure between the impeller wheel disc 2 and the labyrinth seal 5 is further reduced, the pressure difference between the front side and the rear side of the semi-open impeller is further reduced, the generated axial force is smaller, and the running stability of the centrifugal air compressor is improved.
In summary, the present utility model is a specific application example, and the protection scope of the present utility model is not limited, and the technical scheme of adopting equivalent substitution falls within the protection scope of the present utility model.
Claims (8)
1. The utility model provides a centrifugal air compressor machine seal structure that can reduce axial force installs on the centrifugal air compressor machine that has impeller and the posterior lateral plate that is located this impeller rear side, its characterized in that includes first tooth portion and second tooth portion, first tooth portion has the fixed cyclic annular first tooth that sets up on the impeller rear side, second tooth portion has the fixed cyclic annular second tooth that sets up posterior lateral plate front side, first tooth portion with second tooth portion is along the radial staggered arrangement of impeller, just first tooth with second tooth clearance fit still includes the fixed cover and establishes the axle sleeve in the impeller axle outside of centrifugal air compressor machine and the axle sleeve of cover outside of this axle sleeve, the front side of axle sleeve is fixed to be set up on the rear side of posterior lateral plate, the axle sleeve with form the high-pressure region between the impeller, be formed with on the axle sleeve with the reflux through-hole of high-pressure region intercommunication, the end of giving vent to anger of reflux through-hole passes through the back flow with impeller front side import intercommunication.
2. The centrifugal air compressor seal structure capable of reducing axial force according to claim 1, wherein the first tooth portion has a plurality of the first teeth sequentially arranged in a radial direction of the impeller, the second tooth portion has a plurality of the second teeth sequentially arranged in a radial direction of the rear side plate, a plurality of the first teeth and a plurality of the second teeth are staggered in a radial direction of the impeller, and a gap is provided between tooth surfaces of the first teeth and adjacent second teeth.
3. The centrifugal air compressor seal structure capable of reducing axial force according to claim 2, wherein a plurality of the first teeth are disposed at equal intervals in a radial direction of the impeller, and a plurality of the second teeth are disposed at equal intervals in a radial direction of the rear side plate.
4. The centrifugal air compressor sealing structure capable of reducing axial force according to claim 1, wherein a guide ring positioned at the front side of the impeller is fixedly arranged in the centrifugal air compressor, the guide ring is provided with an air inlet through hole communicated with an inlet at the front side of the impeller, and the other end of the return pipe, which is far away from the return through hole, is connected and communicated with the air inlet through hole.
5. The centrifugal air compressor sealing structure capable of reducing axial force according to claim 4, wherein the air inlet end of the return pipe is connected with the air outlet end of the return through hole through a first flange, and a connecting pipe which is connected and communicated with the air inlet end of the air inlet through hole is fixedly arranged on the guide ring and is connected with the air outlet end of the return pipe through a second flange.
6. The centrifugal air compressor seal structure capable of reducing axial force according to claim 1, wherein the shaft seal is a labyrinth seal, a seal tooth part is fixedly arranged on the inner side of the labyrinth seal, a seal space is formed between the seal tooth part and the shaft sleeve, an exhaust through hole is formed in the labyrinth seal, an air inlet end of the exhaust through hole is communicated with the rear end part of the seal space, and an outlet end of the exhaust through hole is connected to the outside of a room through an exhaust pipe.
7. The centrifugal air compressor seal structure capable of reducing axial force according to claim 6, wherein the seal tooth portion has a plurality of seal teeth arranged in sequence in an axial direction of the labyrinth seal, and an air inlet end of the air discharge through hole is located between a second one and a third one of the seal teeth at a rear end of the labyrinth seal.
8. The centrifugal air compressor seal structure capable of reducing axial force according to claim 6, wherein the exhaust pipe is connected to the outlet end of the exhaust through hole through a third flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320318688.2U CN219691802U (en) | 2023-02-27 | 2023-02-27 | Centrifugal air compressor sealing structure capable of reducing axial force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320318688.2U CN219691802U (en) | 2023-02-27 | 2023-02-27 | Centrifugal air compressor sealing structure capable of reducing axial force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219691802U true CN219691802U (en) | 2023-09-15 |
Family
ID=87962769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320318688.2U Active CN219691802U (en) | 2023-02-27 | 2023-02-27 | Centrifugal air compressor sealing structure capable of reducing axial force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219691802U (en) |
-
2023
- 2023-02-27 CN CN202320318688.2U patent/CN219691802U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111441828A (en) | Engine turbine disc cavity structure with prewhirl nozzle and flow guide disc | |
| CN108757055B (en) | Labyrinth seal structure with brush type sealing strip | |
| CN111207080B (en) | Chemical pump with shaft-split middle-opening conveniently-disassembled structure | |
| CN219691802U (en) | Centrifugal air compressor sealing structure capable of reducing axial force | |
| CN211901020U (en) | Boiler induced draft fan | |
| CN211288755U (en) | Air path sealing structure of turbine | |
| CN116641912A (en) | Labyrinth air seal structure electric centrifugal fan | |
| CN112555026B (en) | Multi-thrust disk gas turbine for balancing axial forces | |
| CN114876865A (en) | Supercritical carbon dioxide compressor impeller sealing structure and compressor | |
| CN204609955U (en) | A kind of Multi-tooth corrugated sheet elastic sealing device | |
| CN109026185B (en) | Quick-dismantling and quick-assembling type end steam seal structure of low-parameter back pressure steam turbine | |
| CN204140391U (en) | With the roots blower of combined sealed device | |
| CN219388233U (en) | Impeller assembly structure for centrifugal compressor | |
| CN112879339A (en) | Engine axial force balance adjustment structure | |
| CN220037035U (en) | Axial force balancing structure of impeller of air compressor | |
| CN114458615B (en) | Compact turbine engine compressor bearing structure | |
| CN205387960U (en) | Radial seal structure suitable for cantilever rotor | |
| CN213360550U (en) | Novel sealing device and centrifugal compressor with same | |
| CN220435081U (en) | Novel sealing structure for high-temperature high-pressure molten medium pump | |
| CN111536056A (en) | High-speed multistage blower for conveying and compressing special gas | |
| CN221003239U (en) | Power combined sealing structure for pump | |
| CN209743177U (en) | Horizontal multi-stage pump with small flow and high lift | |
| CN219242206U (en) | Double-stage liquid ring vacuum pump | |
| CN210889436U (en) | Fan sealing device | |
| CN218760491U (en) | High-efficient multi-blade centrifugal fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |