CN202545335U - Shaft seal of nuclear-grade centrifugal fan - Google Patents
Shaft seal of nuclear-grade centrifugal fan Download PDFInfo
- Publication number
- CN202545335U CN202545335U CN 201220138434 CN201220138434U CN202545335U CN 202545335 U CN202545335 U CN 202545335U CN 201220138434 CN201220138434 CN 201220138434 CN 201220138434 U CN201220138434 U CN 201220138434U CN 202545335 U CN202545335 U CN 202545335U
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- CN
- China
- Prior art keywords
- water conservancy
- conservancy diversion
- blower
- volute
- air return
- 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.)
- Expired - Lifetime
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Abstract
The utility model discloses a shaft seal of a nuclear-grade centrifugal fan. The shaft seal comprises a transmission shaft and a fan volute, wherein a flow guide air return cavity which is coated by a flow guide air return cavity shell is formed on the right side of the fan volute; the fan volute, the flow guide air return cavity and the transmission shaft are in clearance fit; one end of an air return pipe is connected to the flow guide air return cavity, and the other end of the air return pipe is connected with an air inlet; a sealing filler is arranged at the right end of the flow guide air return cavity; the sealing filler is in tight fit with the transmission shaft; and a sealing cover is arranged on the sealing filler and fixedly connected with the flow guide air return cavity shell. The shaft seal of the nuclear-grade centrifugal fan solves the problems of the prior art and has the advantages of reasonable structure, simplicity in maintenance, low leakage rate, safety, reliability and the like.
Description
Technical field
The utility model relates to a kind of shaft sealing, is specifically related to a kind of shaft sealing of examining grade centrifugal blower.
Background technique
Partly stipulate by BA among U.S.'s " nuclear air and gas treatment rules " ASME AG 1-2003 that at present ventilator is followed in the nuclear power station in the world; Its leakage limit value of centrifugal blower to carrying radial ray air or gas is: 0.01% of blower fan nominal air delivery/every 249Pa blower pressure, or less than 0.852m
3/ h, both get big value.Owing to must have certain interval between the axle of centrifugal blower running and the static spiral case; The spiral case memory, external memory is at certain pressure reduction (being formed by blower fan internal pressure and external pressure) simultaneously; Therefore must carry out encapsulation process to axle, prevent that leakage rate from surpassing predetermined range and causing the nuclear radiocontamination.At present, the filler mode is taked in known centrifugal blower shaft sealing usually, with the leakage-gap between filler filling, shutoff axle and the spiral case.Its shortcoming is not tight to gas seal, and poor reliability, leakage rate tend to surpass above-mentioned code requirement; Required impacting force is big when installing in addition, causes easily to turn round the wearing and tearing heating and make the lubricating grease outflow in the filler, needs frequent adjustment or changes filler, the maintenance period weak point.Though the effect of the mechanical seal device anti-leak in blower, compressor is fine really; But mechanism is too complicated: need extra fuel feeding or air feeder to seal; The other a kind of axle sealing structure that uses in other industry---the carbocyclic ring sealing was also because need add nitrogen could guarantee sealing effect, and its drawback is the same with mechanical seal in the last few years.
The model utility content
The purpose of model utility: for addressing the above problem, the utility model provides a kind of rational in infrastructure, shaft sealing of safeguarding simple, low leakage, safe and reliable nuclear level centrifugal blower.
Technological scheme: for achieving the above object, the utility model adopts following technological scheme:
A kind of shaft sealing of examining grade centrifugal blower; Comprise transmission shaft and volute of blower, the right side of said volute of blower is provided with the water conservancy diversion return-air chamber of water conservancy diversion return-air cavity shell parcel, is Spielpassung between said volute of blower and water conservancy diversion return-air chamber and the transmission shaft; Also be connected with an end of muffler in the said water conservancy diversion return-air chamber; The other end of muffler is connected with the general mood intake grill, and the right-hand member in said water conservancy diversion return-air chamber is provided with stuffing box packing, and said stuffing box packing and transmission shaft closely cooperate; Sealing cover is installed in the stuffing box packing, and sealing cover also is fixedly connected with water conservancy diversion return-air cavity shell.
Said volute of blower also is equipped with stiffening plate in a side that is connected with water conservancy diversion return-air cavity shell, and the continuous full weld of stiffening plate is on volute of blower.
The mode of taking " dredging bridging closes " of the utility model; The major part gas that internal leakage comes out between spiral case and transmission shaft is back to the suction port through the water conservancy diversion muffler again, that is to say most of internal leakage gas, really do not leak into the outside and go still in the blower fan inner loop; But in real the use; The axle gas leakage can not all get in the water conservancy diversion muffler, therefore in outermost one deck of this axle sealing structure, adds filler again and seals, and the shutoff pressure that this moment, filler partly bore is very low; Therefore the life-span of filler can increase greatly, and whole anti-leak result also will improve greatly.
Beneficial effect: the utility model is rational in infrastructure, maintenance is simple, low leakage, safe and reliablely be difficult for causing wearing and tearing and heating phenomenon, thereby prolongs stuffing box packing working life by a relatively large margin.
Description of drawings
Fig. 1 is the structural representation of the utility model.
Embodiment
A kind of shaft sealing of examining grade centrifugal blower as shown in Figure 1; Comprise transmission shaft 1 and volute of blower 2, the right side of volute of blower 2 is provided with the water conservancy diversion return-air chamber 4 of water conservancy diversion return-air cavity shell 3 parcels, is Spielpassung between said volute of blower 2 and water conservancy diversion return-air chamber 4 and the transmission shaft 1; Also be connected with an end of muffler 5 in the water conservancy diversion return-air chamber 4; The other end of muffler 5 is connected with the general mood intake grill, and the right-hand member in water conservancy diversion return-air chamber 4 is provided with stuffing box packing 6, and said stuffing box packing 6 closely cooperates with transmission shaft 1; Sealing cover 7 is installed in the stuffing box packing 6; Sealing cover 7 also is fixedly connected with water conservancy diversion return-air cavity shell 3, and volute of blower 2 also is equipped with stiffening plate 8 in a side that is connected with water conservancy diversion return-air cavity shell 3, and stiffening plate 8 continuous full welds are on volute of blower 2.
Claims (2)
1. shaft sealing of examining grade centrifugal blower; Comprise transmission shaft and volute of blower, it is characterized in that: the right side of said volute of blower is provided with the water conservancy diversion return-air chamber of water conservancy diversion return-air cavity shell parcel, is Spielpassung between said volute of blower and water conservancy diversion return-air chamber and the transmission shaft; Also be connected with an end of muffler in the said water conservancy diversion return-air chamber; The other end of muffler is connected with the general mood intake grill, and the right-hand member in said water conservancy diversion return-air chamber is provided with stuffing box packing, and said stuffing box packing and transmission shaft closely cooperate; Sealing cover is installed in the stuffing box packing, and sealing cover also is fixedly connected with water conservancy diversion return-air cavity shell.
2. the shaft sealing of nuclear level centrifugal blower according to claim 1, it is characterized in that: said volute of blower also is equipped with stiffening plate in a side that is connected with water conservancy diversion return-air cavity shell, and the continuous full weld of stiffening plate is on volute of blower.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220138434 CN202545335U (en) | 2012-04-05 | 2012-04-05 | Shaft seal of nuclear-grade centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220138434 CN202545335U (en) | 2012-04-05 | 2012-04-05 | Shaft seal of nuclear-grade centrifugal fan |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202545335U true CN202545335U (en) | 2012-11-21 |
Family
ID=47165978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220138434 Expired - Lifetime CN202545335U (en) | 2012-04-05 | 2012-04-05 | Shaft seal of nuclear-grade centrifugal fan |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202545335U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362855A (en) * | 2012-04-05 | 2013-10-23 | 南通大通宝富风机有限公司 | Shaft seal of nuclear grade centrifugal fan |
-
2012
- 2012-04-05 CN CN 201220138434 patent/CN202545335U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103362855A (en) * | 2012-04-05 | 2013-10-23 | 南通大通宝富风机有限公司 | Shaft seal of nuclear grade centrifugal fan |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121121 |
|
| CX01 | Expiry of patent term |