CN209925285U - Nuclear power centrifugal fan negative pressure sealing device - Google Patents
Nuclear power centrifugal fan negative pressure sealing device Download PDFInfo
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- CN209925285U CN209925285U CN201920462653.XU CN201920462653U CN209925285U CN 209925285 U CN209925285 U CN 209925285U CN 201920462653 U CN201920462653 U CN 201920462653U CN 209925285 U CN209925285 U CN 209925285U
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- return pipe
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Abstract
The utility model discloses a negative pressure sealing device of a centrifugal fan for nuclear power, which comprises a sealing cavity and an air return pipe communicated with the inside of the sealing cavity, wherein the other end of the air return pipe is connected with an air inlet of the fan; the center of the seal cavity is connected with a rotating shaft, one end of the seal cavity is provided with a rubber ring and a pressing plate, and the centers of the rubber ring and the pressing plate are sleeved at the end of the rotating shaft to form a zigzag labyrinth seal. The air return pipe is connected with the air inlet of the fan to form negative pressure, so that the leakage rate of the fan is close to zero leakage, the requirement of post-treatment fan shaft leakage in a nuclear power station can be met, and the requirement of long-time stable operation can be kept.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a sealing device especially relates to a centrifugal fan negative pressure sealing device for nuclear power, belongs to the special sealing device of system's fan that transport radioactive gas, irradiation dose are bigger.
[ background of the invention ]
The post-treatment fan for the nuclear power station conveys radioactive gas and has high-dose radiation components, in order to prevent gas leakage, the sealing requirement of the fan is nearly zero leakage, the existing common shaft system sealing structure is simple, the sealing performance is poor, and the scheme is generated by solving the problem.
[ Utility model ] content
In order to overcome the defects, the utility model provides a novel fan negative pressure sealing device to satisfy the requirement that the aftertreatment fan axle leaked in the nuclear power station.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a negative pressure sealing device of a centrifugal fan for nuclear power comprises a sealing cavity and an air return pipe communicated with the inside of the sealing cavity, wherein the other end of the air return pipe is connected with an air inlet of the fan; the center of the seal cavity is connected with a rotating shaft, one end of the seal cavity is provided with a rubber ring and a pressing plate, and the centers of the rubber ring and the pressing plate are sleeved at the end of the rotating shaft to form a zigzag labyrinth seal.
The air return pipe is connected with an air inlet of the fan and is an air inlet, and the air return pipe is connected with the sealed cavity and is an air outlet.
The air return pipe is composed of a plurality of steel pipes through pipe joints.
By adopting the negative pressure sealing device of the utility model, the air return pipe is connected with the air inlet of the fan to form negative pressure; in practical application, the leakage rate of the fan is 0.01 percent of the normal air flow rate under the operation pressure of 260Pa, the leakage rate is almost zero leakage, the requirements of radioactive gas in a nuclear power station and the leakage rate of a fan shaft with a large radiation dose can be met, and the requirement of long-time stable operation can be kept.
[ description of the drawings ]
Fig. 1 is a schematic view of the structure installation of the present invention.
In the figure: 1-pipe joint, 2-muffler, 3-exhaust port, 4-sealed cavity, 5-rubber ring, 6-pressing plate, 7-rotating shaft, 8-rear side plate of machine shell, 9-air inlet and 10-air inlet.
[ detailed description ] embodiments
As shown in fig. 1, the utility model discloses a negative pressure sealing device of a centrifugal fan for nuclear power, which is characterized in that the negative pressure sealing device comprises a sealed cavity 4 and a muffler 2 communicated with the inside of the sealed cavity 4, and the other end of the muffler 2 is connected with an air inlet 9 of the fan; the center of the seal cavity 4 is connected with a rotating shaft 7, one end of the seal cavity 4 is provided with a rubber ring 5 and a pressing plate 6, and the centers of the rubber ring 5 and the pressing plate 6 are sleeved at the end of the rotating shaft 7 to form a zigzag labyrinth seal.
The air return pipe 2 is connected with an air inlet 9 of the fan to form an air inlet 10, and the air return pipe 2 is connected with the sealed cavity 4 to form an air outlet 3; the air return pipe 2 is composed of a plurality of steel pipes through pipe joints 1.
The working principle is as follows: a zigzag labyrinth is formed between the seal cavity 4 and the rear side plate 8 of the casing by using an irradiation-resistant rubber ring 5 and a pressing plate 6, the rubber ring 5 is in contact with a rotating shaft 7, the seal cavity 4 is radially provided with an exhaust port 3, and is connected with an air inlet 9 of a fan through an air return pipe 2 to form negative pressure, so that gas leaked from the rear side plate 8 of the casing is sucked back to the air inlet 9, and the requirement of near zero leakage is met.
The first embodiment is as follows: when the fan operates, gas in the fan leaks outwards through the shell rear side plate hole 8, the front end of the seal cavity 4 is a zigzag labyrinth consisting of the radiation-resistant rubber ring 5 and the pressing plate 6, and the rubber ring 5 is tightly matched with the rotating shaft 7, so that most of gas is prevented from leaking.
Example two: although the zigzag labyrinth formed by the radiation-resistant rubber ring 5 and the pressing plate 6 prevents most of gas from leaking, a small part of gas still leaks and flows into the sealed cavity 4, the radial position of the sealed cavity 4 is provided with the exhaust port 3 which is connected with the air return pipe 2, the air inlet 9 of the fan is in negative pressure under the action of centrifugal force, the inside of the sealed cavity 4 is in micro positive pressure, and trace leakage flowing into the sealed cavity 4 is sucked to the air inlet 9 of the fan through the air return pipe 2, so that effective sealing is realized in a circulating manner.
Claims (3)
1. A negative pressure sealing device of a centrifugal fan for nuclear power is characterized by comprising a sealing cavity (4) and an air return pipe (2) communicated with the inside of the sealing cavity (4), wherein the other end of the air return pipe (2) is connected with an air inlet (9) of the fan; the center of the seal cavity (4) is connected with a rotating shaft (7), one end of the seal cavity (4) is provided with a rubber ring (5) and a pressing plate (6), and the centers of the rubber ring (5) and the pressing plate (6) are sleeved at the end of the rotating shaft (7) to form a zigzag labyrinth seal.
2. The negative pressure sealing device of the nuclear power centrifugal fan as claimed in claim 1, wherein the air return pipe (2) is connected with an air inlet (9) of the fan and is an air inlet (10), and the air return pipe (2) is connected with the sealing cavity (4) and is an air outlet (3).
3. The negative pressure sealing device of the nuclear power centrifugal fan as claimed in claim 1, wherein the air return pipe (2) is composed of a plurality of steel pipes passing through the pipe joints (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920462653.XU CN209925285U (en) | 2019-04-08 | 2019-04-08 | Nuclear power centrifugal fan negative pressure sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920462653.XU CN209925285U (en) | 2019-04-08 | 2019-04-08 | Nuclear power centrifugal fan negative pressure sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209925285U true CN209925285U (en) | 2020-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920462653.XU Active CN209925285U (en) | 2019-04-08 | 2019-04-08 | Nuclear power centrifugal fan negative pressure sealing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN209925285U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855604A (en) * | 2021-01-12 | 2021-05-28 | 桂林理工大学 | Sealing system for sulfur dioxide fan |
-
2019
- 2019-04-08 CN CN201920462653.XU patent/CN209925285U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112855604A (en) * | 2021-01-12 | 2021-05-28 | 桂林理工大学 | Sealing system for sulfur dioxide fan |
| CN112855604B (en) * | 2021-01-12 | 2022-10-21 | 桂林理工大学 | Sealing system for sulfur dioxide fan |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 312300 No. 1818, Renmin West Road, Dongguan Street, Shangyu District, Shaoxing City, Zhejiang Province Patentee after: Zhejiang Shangfeng high tech special wind industry Co.,Ltd. Address before: 312300 No. 1818 Renmin West Road, Shangyu District, Zhejiang, Shaoxing Patentee before: ZHEJIANG SHANGFENG HI-TECH SPECIALIZED WIND INDUSTRIAL Co.,Ltd. |