CN216867507U - Labyrinth sealing device of fan shaft - Google Patents
Labyrinth sealing device of fan shaft Download PDFInfo
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- CN216867507U CN216867507U CN202122612148.9U CN202122612148U CN216867507U CN 216867507 U CN216867507 U CN 216867507U CN 202122612148 U CN202122612148 U CN 202122612148U CN 216867507 U CN216867507 U CN 216867507U
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- labyrinth seal
- sealing
- fan shaft
- oil
- seal
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Abstract
The utility model discloses a labyrinth seal device of a fan shaft, which comprises a labyrinth seal and a seal cover; the labyrinth seal is arranged on the fan shaft in a sealing manner; a circle of annular bulge is arranged on the outer side of the labyrinth seal, and the ring center of the annular bulge is positioned on the axis of the fan shaft; the sealing cover is positioned on the outer side of the labyrinth seal and comprises a buckling part positioned on the outer ring part and a sealing part positioned on the inner ring part; the buckling part of the sealing cover is buckled on the annular bulge, and a sealing cavity is arranged between the sealing part and the outer side of the labyrinth seal; and an oil return passage communicated with the sealing cavity and the outside of the labyrinth seal is formed at the lower part of the labyrinth seal. According to the labyrinth sealing device, through the arrangement of the sealing cover, the sealing cavity and the oil return passage, oil seeped out from the labyrinth seal in the running process of the fan enters the sealing cavity and enters the oil return passage at the lower part of the labyrinth seal, and then the oil can be collected or sent into the oil tank; thereby avoiding the phenomenon of oil leakage caused by abrasion of the added filler; simple structure, grease clearance effect are better.
Description
Technical Field
The utility model relates to a sealing device, in particular to a labyrinth sealing device of a fan shaft.
Background
Labyrinth seal refers to a seal having a plurality of tortuous chambers between the rotating and stationary parts to minimize leakage. Is an ideal labyrinth flow passage model; several annular sealing teeth are arranged around the rotating shaft, a series of cut-off gaps and expansion cavities are formed between the teeth, and the sealed medium generates throttling effect when passing through the gaps of the zigzag labyrinth, so that the purpose of leakage resistance is achieved. Because the clearance exists between the rotor and the casing of the labyrinth seal, the labyrinth seal has no solid contact, does not need lubrication, allows thermal expansion, and adapts to the occasions of high temperature, high pressure and high rotating speed frequency, and the seal form is widely used for the shaft end and each stage seal of a steam turbine, a gas turbine, a compressor and a blower, and the front seal of other dynamic seals.
Centrifugal fan shaft seal material is cast aluminium usually, and aluminium matter broach surface is after impurity scouring and wear, destruction in the operation process by the medium, and labyrinth seal inefficacy causes the seepage, causes the bearing lubrication bad, reduces bearing life, causes the grease extravagant simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a labyrinth sealing device of a fan shaft, which can effectively prevent oil leakage.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows: it comprises a labyrinth seal and a seal cover; the labyrinth seal is arranged on the fan shaft in a sealing manner; a circle of annular bulge is arranged on the outer side of the labyrinth seal, and the ring center of the annular bulge is positioned on the axis of the fan shaft; the sealing cover is positioned on the outer side of the labyrinth seal and comprises a buckling part positioned on the outer ring part and a sealing part positioned on the inner ring part; the buckling part of the sealing cover is buckled on the annular bulge, and a sealing cavity is arranged between the sealing part and the outer side of the labyrinth seal; and an oil return passage communicated with the sealing cavity and the outside of the labyrinth seal is formed at the lower part of the labyrinth seal.
The fan shaft in the sealed cavity is sleeved with the oil blocking spring.
The oil return passage is communicated with an oil tank.
The oil return passage is of an inclined structure. The included angle between the oil return passage and the horizontal plane is 15-30 degrees.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: according to the utility model, through the arrangement of the sealing cover, the sealing cavity and the oil return passage, oil seeped out from the labyrinth seal in the running process of the fan enters the sealing cavity and enters the oil return passage at the lower part of the labyrinth seal, and then the oil can be collected or sent into the oil tank; thereby avoiding the phenomenon of oil leakage caused by abrasion of the filling material. The oil purifier has the advantages of simple structure and better grease cleaning effect, can prolong the service life of the oil purifier, effectively avoids overlarge vibration when equipment is started, provides good lubrication guarantee for main equipment, and further effectively prolongs the service life of a bearing.
According to the utility model, through the arrangement of the oil blocking spring, the grease entering the sealing cavity can be blocked by the oil blocking spring, and the grease is brought into the oil return passage at the lower part by the oil blocking spring by virtue of centrifugal force in the operation process, so that the grease collecting capacity and effect are further improved, the oil return capacity is improved, and the service life of the bearing is further prolonged.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of the present invention.
In the figure: a fan shaft 1; a labyrinth seal 2; an annular chamber 2-1; 2-2 of annular bulge; a sealing cover 3; a fastening part 3-1; a seal portion 3-2; a sealed cavity 4; an oil-blocking spring 5; and an oil return passage 6.
Detailed Description
As shown in figure 1, the labyrinth seal device of the fan shaft comprises a labyrinth seal 2, a seal cover 3 and an oil-blocking spring 5. The labyrinth seal 2 is of an annular structure, is sleeved on the fan shaft 1 and leaves a gap with the fan shaft 1; a plurality of circles of annular chambers 2-1 are arranged inside the labyrinth seal 2, so that a plurality of annular seal teeth which are arranged in sequence are formed, a series of cut-off gaps and expansion cavities are formed between the teeth, and the sealed medium generates a throttling effect when passing through the gaps of the zigzag labyrinth, so that the purpose of leakage resistance is achieved. The outer side of the labyrinth seal 2 is provided with a circle of annular bulge 2-2, and the center of the annular bulge 2-2 is positioned on the axis of the fan shaft 1.
As shown in FIG. 1, the sealing cover 3 of the labyrinth sealing device of the fan shaft is of an annular structure and comprises an integral buckling part 3-1 and a sealing part 3-2; the buckling part 3-1 is positioned at the outer ring part of the outer side and is of an annular structure, and an annular groove is formed in one side of the buckling part 3-1; the groove is matched with the annular bulge 2-2 of the labyrinth seal 2, and the buckling part 3-1 is buckled on the annular bulge 2-2. The sealing part 3-2 is positioned at the inner ring part of the inner side and is of an annular structure, and the fan shaft 1 penetrates through the sealing part 3-2; a sealing cavity 4 is arranged between the sealing part 3-2 and the outer side of the labyrinth seal 2, and the sealing cavity 4 is an annular cavity.
As shown in FIG. 1, an oil blocking spring 5 is sleeved on a fan shaft 1 in a sealing cavity 4 of the labyrinth sealing device of the fan shaft; the oil blocking spring 5 tightly holds the fan shaft 1, and the tightness of the oil blocking spring 5 is suitable for ensuring that the oil blocking spring 5 and the fan shaft 1 are synchronous when the fan operates.
In the labyrinth seal device of the fan shaft shown in fig. 1, an oil return passage 6 is formed at the lower part of the labyrinth seal 2; the oil return passage 6 is communicated with the sealing cavity 4 and the outside of the labyrinth seal 2; the oil return passage 6 is of an inclined structure, and the included angle between the oil return passage 6 and the horizontal plane is 15-30 degrees; in this way, the top of the oil return passage 6 communicates with the lower part of the seal chamber 4, and the lower part of the oil return passage 6 communicates with the external environment. The lower part of the oil return passage 6 is preferably connected with an oil return pipe, and the other end of the oil return pipe is communicated with an oil tank.
As shown in fig. 1, the labyrinth seal device for the fan shaft is used in the following process: a series of regular throttling gaps and expansion cavities are formed between the labyrinth seal 2 and the rotating shaft by the annular chamber 2-1, when a sealed medium flows through gaps formed by the seal teeth and the shaft surface, the sealed medium flow is subjected to a primary throttling action, the pressure and the temperature of the sealed medium flow are reduced, the flow speed is increased, and the annular chamber 2-1 formed by the two seal teeth passes through the gaps; the volume of the sealed medium in the annular chamber 2-1 is increased, the speed is reduced, vortex flow is formed, and certain heat energy is generated. Therefore, the sealed medium is subjected to one throttling and expansion action for each time the sealed medium passes through the gap and the subsequent annular chamber 2-1 before the annular chamber 2-1 returns to the throttling temperature. The flow rate and the pressure drop of the sealed medium are increased along with the increase of the amount of the sealed medium flowing through the gap and the annular chamber 2-1 and the reduction of the gap value, and the sealed medium does not continuously flow outwards when the pressure is reduced to approximate back pressure, so that the sealed medium is sealed.
In the running process of the fan, grease seeped out from the labyrinth seal 2 enters the seal cavity 4 and is blocked by the oil blocking spring 5 in the seal cavity 4, and the grease is brought to the position of the oil return passage 6 at the lower part by the oil blocking spring 5 by means of centrifugal force in the running process and flows out of the seal cavity 4 and the labyrinth seal 2 through the oil return passage 6; the grease flowing out of the labyrinth seal 2 can be collected and can be returned to the oil tank again through an oil return pipe.
Claims (5)
1. The utility model provides a labyrinth seal device of fan axle which characterized in that: it comprises a labyrinth seal (2) and a seal cover (3); the labyrinth seal (2) is arranged on the fan shaft (1) in a sealing manner; a circle of annular bulge (2-2) is arranged on the outer side of the labyrinth seal (2), and the center of the annular bulge (2-2) is positioned on the axis of the fan shaft (1); the sealing cover (3) is positioned on the outer side of the labyrinth seal (2) and comprises a buckling part (3-1) positioned on an outer ring part and a sealing part (3-2) positioned on an inner ring part; a buckling part (3-1) of the sealing cover (3) is buckled on the annular bulge (2-2), and a sealing cavity (4) is arranged between the sealing part (3-2) and the outer side of the labyrinth seal (2); and the lower part of the labyrinth seal (2) is provided with an oil return passage (6) for communicating the sealing cavity (4) with the outside of the labyrinth seal (2).
2. The labyrinth seal for a fan shaft of claim 1, wherein: and an oil blocking spring (5) is sleeved on the fan shaft (1) in the sealed cavity (4).
3. The labyrinth seal for a fan shaft of claim 1, wherein: the oil return passage (6) is communicated with an oil tank.
4. A fan shaft labyrinth seal as claimed in claim 1, 2 or 3, wherein: the oil return passage (6) is of an inclined structure.
5. The labyrinth seal of a fan shaft of claim 4, wherein: the included angle between the oil return passage (6) and the horizontal plane is 15-30 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122612148.9U CN216867507U (en) | 2021-10-28 | 2021-10-28 | Labyrinth sealing device of fan shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122612148.9U CN216867507U (en) | 2021-10-28 | 2021-10-28 | Labyrinth sealing device of fan shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216867507U true CN216867507U (en) | 2022-07-01 |
Family
ID=82126010
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122612148.9U Active CN216867507U (en) | 2021-10-28 | 2021-10-28 | Labyrinth sealing device of fan shaft |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216867507U (en) |
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2021
- 2021-10-28 CN CN202122612148.9U patent/CN216867507U/en active Active
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