CN1757930A - Shaft seal device used for ultra low specific rotating speed centrifugal fan - Google Patents
Shaft seal device used for ultra low specific rotating speed centrifugal fan Download PDFInfo
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- CN1757930A CN1757930A CN 200510030770 CN200510030770A CN1757930A CN 1757930 A CN1757930 A CN 1757930A CN 200510030770 CN200510030770 CN 200510030770 CN 200510030770 A CN200510030770 A CN 200510030770A CN 1757930 A CN1757930 A CN 1757930A
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- axle sleeve
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Abstract
A shaft seal for the centrifugal blower with ultra-low rotation speed ratio features that 4-6 group of 8-12 sealing rings, which has slot on its surface for arranging flat spring in it, are installed in the annular slots on the upper and lower cover plates fixed at outsides of the shaft sleeve of the mainshaft of blower, the flanges of upper and lower cover plates are welded to the back end cover of the casing of blower, and said upper cover plate has two oil holes and an air hole for filling lubricating oil and inertial gas.
Description
Technical field
The present invention relates to a kind of gland seal device, relate in particular to a kind of gland seal device that is used for the ultra-low specific speed centrifugal blower, belong to the technical field of sealing technology of machinery product.
Background technique
Mechanical seal is a kind of gland seal device of rotating machinery.The application of mechanical seal in the fluid machinery series products at present is very extensive, and along with the raising of product technology level and the requirement of energy saving, the application prospect of mechanical seal will be more extensive.The sealing effect of mechanical seal will directly influence the operation of complete machine, especially in petrochemical industry, media such as inflammable because of existing, explosive, volatile, severe toxicity, leaking appears in mechanical seal, to have a strong impact on production and normally carry out, serious also serious accident will occur.Thereby do not carry out seal operation, and safety does not have guarantee, and production is not known where to begin.
In the prior art, mechanical seal is to seal by the end face of the ring of a pair of relative movement small axial clearance that forms of fitting mutually, and mechanical seal is made up of rotating ring, stationary ring, clamping element and seal element usually.The end face of rotating ring and the stationary ring friction pair that partners wherein, rotating ring is pressed on the stationary ring end face its end face by the pressure of liquid in the closed chamber, and on two ring end faces, produce suitable pressure reduction and keep one deck as thin as a wafer liquid film and reach the purpose of sealing.Mechanical seal is not isolated parts in actual motion, it is the operations that combine of other component with blower fan, simultaneously as can be seen by its basic principle, the normal operation of mechanical seal is with good conditionsi, for example: moving axially of blower fan main shaft can not be too big, otherwise friction pair end face can not form the gap of normal requirement; The blower fan main shaft of mechanical seal place can not have too big amount of deflection, otherwise end force can be inhomogeneous or the like.Therefore, have only and satisfy of this sort external condition, add favorable mechanical sealing self performance, just can reach the desirable seal effect.
The ultra-low specific speed centrifugal blower is compared with common blower fan, and flow is little, pressure is high, is a kind of design and all bigger unconventional blower fan of manufacture difficulty.This class blower fan is used in the key position of industry production lines such as petrochemical industry, chemical fibre mostly.Therefore, operation and the maintenance for blower fan has higher requirement.Concerning the mechanical seal that is used for ultra-low specific speed centrifugal blower axle head, not only require to have less leakage rate, also should have long working life.Ultra-low specific speed centrifugal blower pressure is higher, as adopts common mechanical seal, and its seal ring quantity and structure generally can not reach the requirement of little leakage rate or even zero leakage amount.Secondly, in order to raise the efficiency, such blower fan often adopts the backward type impeller, and the draught fan impeller diameter is bigger, and meeting fan and unit bring bigger vibration.The vibration of unit brings very big influence also can for the effect of sealing.In addition, the structure of conventional machinery sealing bothers when maintenance, whole impeller all must be pulled out from the spiral case of blower fan, just can finish the maintenance and the replacing of sealing.Therefore, design a kind of mechanical seal that is specifically designed to the ultra-low specific speed centrifugal blower, have important application and industrial prospect.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, design provides a kind of gland seal device that is used for the ultra-low specific speed centrifugal blower, enable to adapt to the characteristic that flow is little, pressure is high of ultra-low specific speed centrifugal blower, in actual applications, not only can satisfy the industrial requirements of little leakage or zero leakage amount, and have long working life.
For realizing this purpose, the gland seal device of the present invention's design adopts horizonally split formula structure, be installed in axle sleeve outside fixed cover plate and lower cover plate on the blower fan main shaft, be welded on the rear end cover of fan casing with cover plate flange connecting up and down, cover plate has annular groove in order to seal ring to be installed up and down.Seal ring adopts three pieces type structural type, places the anchor ring spring in the anchor ring groove of seal ring, by the anchor ring spring seal ring tightly is enclosed within on the axle sleeve.Two oil holes and a pore are set on the upper cover plate.The present invention adopts the seal ring group of four group of eight ring or six group of 12 ring formation, to reduce the gas differential pressure between the seal ring, reaches sealing effect to greatest extent.By oil hole and pore, can inject lubricant oil and feed inert gas, reach cooling and strengthen the effect that seals.
Concrete structure of the present invention is: axle sleeve is installed on the blower fan main shaft by interference fit, upper cover plate that the axle sleeve outside is fixing and lower cover plate are for matching semicircle up and down, cover plate links together by connecting bolt and flange respectively up and down, and flange is welded on the rear end cover of fan casing.Upper cover plate has annular groove in order to seal ring to be installed with the inboard that lower cover plate contacts with axle sleeve, places the anchor ring spring in two one group of the seal ring, the anchor ring groove of each seal ring, by the anchor ring spring seal ring tightly is enclosed within on the axle sleeve.Two oil holes are set on the upper cover plate, also have a pore.Axle sleeve has annular groove near a side of flange, in this annular groove seal ring is installed.
In the design of each dynamic seal, sixty-four dollar question is when obtaining low the leakage, how to reduce friction, wearing and tearing that seal face is built.Leakage rate is most important sealability parameter, and it depends on gap or thickness between seal face to a great extent, and thickness is often by the determining positions of the seal ring that floats.And the position of seal ring is determined by effect two opposing forces thereon.One is closing force, and this power tries hard to make the pairing end face to keep bonding, with film thickness value between the end face that reduces to produce leakage; Another is the opening force that acts on the sealing anchor ring, and it is produced by hydrostatic pressure effect in the lubricating film between the pairing end face and dynamic pressure effect.When conventional machinery sealing is used for the axle head mechanical seal of low-specific-speed centrifugal blower, tend to take place fluid vaporization between end face, make instantaneous opening force greater than closing force, the moment of causing end face opens and produces serious leakage.Given this, the seal ring among the present invention adopts three designs, and the seal ring anchor ring is fastening by spring.Can be according to operating conditions, the size of adaptive control closing force.When operating conditions or environmental conditions change, provide enough closing forces by the anchor ring spring, to avoid excessive lubricated thickness.In addition, sealing ring design also can avoid because all vaporization and the complete dry friction that may cause of end face liquid, end wear is reduced and prolongs the working life of sealing greatly.
In order to adapt to low-specific-speed centrifugal blower high pressure, according to the work characteristics of blower fan, adopt the structure of four group of eight ring or six group of 12 ring among the present invention, fully reduce the gas differential pressure between seal ring and the seal ring, reach sealing effect to greatest extent.
In order to satisfy harsh commercial Application condition, on the upper end cap of gland seal device, have pore, can feed inert gas, reach the requirement of zero leakage.In adopting the gas block techniques, pressed gas is introduced by pore, produces the static pressure thrust of fluid, and inner hydrostatic pressure balance is provided, thereby contact load is evenly issued, and also can be used as the oiling agent and the freezing mixture of seal face simultaneously, eliminates abrasive dust.The gas block techniques has the following advantages: the reliability height, and easy for installation; Significantly the generation of control heat has reduced temperature rise, has reduced wearing and tearing, has improved the life-span of sealing; Adopt inert gas can guarantee to block fluid and can not pollute the blower fan gas working medium, and can avoid because of blocking the environmental pollution problem that escape of liquid causes.
In addition, consider maintenance and the convenience of installing, gland seal device of the present invention adopts horizonally split formula structure, like this when gland seal device keeps in repair, will from volute of blower, not pull out by whole impeller, avoid destroying the original assemblage gap of blower fan, shortened the time of installation and maintenance greatly.
Description of drawings
Fig. 1 is the structural representation of seal arrangement of the present invention.
Among Fig. 1,1,2 is oil hole, and 3 is upper cover plate, and 4 is seal ring, and 5 is axle sleeve, and 6 is lower cover plate, and 7 is connecting bolt, and 8 is flange, and 9 is blower fan main shaft, and 10 is seal ring, and 11 is pore, and 12 is the fan casing back shroud, and 13 is the anchor ring spring.
Fig. 2 is the structural representation of seal ring among the present invention.
Among Fig. 2, a is the plan view of seal ring, and b is the side view of seal ring; 13 is the anchor ring spring, and 4 is seal ring.
Embodiment
Below in conjunction with accompanying drawing technological scheme of the present invention is described in further detail.
The gland seal device structure that is used for the ultra-low specific speed centrifugal blower of the present invention as shown in Figure 1, adopt horizonally split formula structure, axle sleeve 5 is installed on the blower fan main shaft 9 by interference fit, upper cover plate 3 that axle sleeve 5 outsides are fixing and lower cover plate 6 are for matching semicircle up and down, cover plate links together by connecting bolt 7 and flange 8 respectively up and down, flange 8 by welded and installed on the rear end cover 12 of fan casing.Upper cover plate 3 has annular groove in order to seal ring 4 to be installed with the inboard that lower cover plate 6 contacts with axle sleeve 5.4 two one group of seal ring constitutes seal ring group structure by four group of eight ring or six group of 12 ring.Place anchor ring spring 13 in the anchor ring groove of each seal ring 4, seal ring 4 tightly is enclosed within on the axle sleeve 5 by anchor ring spring 13.The axial position of seal ring 4 is determined by upper cover plate 3 and lower cover plate 6.On the sealing upper cover plate 3 two oil holes 1,2 are set, also have pore 11.Axle sleeve 5 has annular groove near a side of flange 8, and seal ring 10 is installed in this annular groove.
Fig. 2 is the structural representation of seal ring among the present invention.
As shown in Figure 2, the seal ring 4 among the present invention adopts three pieces type structural type, and the anchor ring spring of placing in the anchor ring groove by seal ring 4 13 tightly is enclosed within on the axle sleeve 5 seal ring 4.
For adapting to the higher working pressure of ultra-low specific speed centrifugal blower, the present invention adopts the seal ring group structure of four group of eight ring or six group of 12 ring, fully reduces the gas differential pressure between seal ring and the seal ring, reaches sealing effect to greatest extent.Gap between seal ring 4 anchor rings and the axle sleeve 5 can be according to operating conditions, and by spring, the size of self adaptive control closing force is regulated.When operating conditions or environmental conditions change, provide enough closing forces by anchor ring spring 13, to avoid excessive lubricated thickness.The design of seal ring 4 also can avoid because all vaporization and the complete dry friction that may cause of end face liquid, end wear is reduced and prolongs the working life of sealing greatly.On the sealing upper cover plate 3 two oil holes 1,2 are set, so that regularly inject lubricant oil (generally being no more than two months once), to reach cooling and to strengthen the effect that seals to seal arrangement.For satisfying harsh commercial Application condition, on the sealing upper cover plate, have pore 11, can feed inert gas, reach the requirement of zero leakage.Seal ring 10 between axle sleeve 5 and the flange 8 can further strengthen sealing effect.Whole sealing device adopts horizonally split formula structure, can convenient for maintaining and installation.
Claims (3)
1, a kind of gland seal device that is used for the ultra-low specific speed centrifugal blower, it is characterized in that adopting horizonally split formula structure, axle sleeve (5) is installed on the blower fan main shaft (9) by interference fit, upper cover plate (3) that axle sleeve (5) outside is fixing and lower cover plate (6) are for matching semicircle up and down, cover plate links together by connecting bolt (7) and flange (8) respectively up and down, flange (8) is welded on the rear end cover (12) of fan casing, upper cover plate (3) has annular groove in order to seal ring (4) to be installed with the inboard that lower cover plate (6) contacts with axle sleeve (5), (4) two one group of seal ring, place anchor ring spring (13) in the anchor ring groove of each seal ring (4), by anchor ring spring (13) seal ring (4) tightly is enclosed within on the axle sleeve (5), two oil holes (1 are set on the upper cover plate (3), 2) and a pore (11), axle sleeve (5) has annular groove near a side of flange (8), and seal ring (10) is installed in the annular groove.
2, according to the gland seal device that is used for the ultra-low specific speed centrifugal blower of claim 1, it is characterized in that described seal ring (4) has four group of eight ring or six group of 12 ring, constitute seal ring group structure.
3,, it is characterized in that described seal ring (4) adopts three pieces type structural type according to the gland seal device that is used for the ultra-low specific speed centrifugal blower of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100307701A CN100370147C (en) | 2005-10-27 | 2005-10-27 | Shaft seal device used for ultra low specific rotating speed centrifugal fan |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100307701A CN100370147C (en) | 2005-10-27 | 2005-10-27 | Shaft seal device used for ultra low specific rotating speed centrifugal fan |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1757930A true CN1757930A (en) | 2006-04-12 |
| CN100370147C CN100370147C (en) | 2008-02-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100307701A Expired - Fee Related CN100370147C (en) | 2005-10-27 | 2005-10-27 | Shaft seal device used for ultra low specific rotating speed centrifugal fan |
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| CN (1) | CN100370147C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899577A (en) * | 2012-12-28 | 2014-07-02 | 上海宝钢工业技术服务有限公司 | Coal gas pressurizing fan |
| CN106122078A (en) * | 2016-08-30 | 2016-11-16 | 湖北双剑鼓风机股份有限公司 | The asymmetric carbon ring seal device of card slot type for centrifugal blower |
| CN107120306A (en) * | 2017-05-09 | 2017-09-01 | 福建东亚环保科技股份有限公司 | A kind of blower fan of sealing structure and the application sealing structure |
| CN107676295A (en) * | 2017-11-20 | 2018-02-09 | 南通大通宝富风机有限公司 | A kind of novel casing shaft seal structure |
| CN112943674A (en) * | 2021-02-03 | 2021-06-11 | 健龙(海宁)机械工业有限公司 | Dry dust removal fan for converter gas |
| CN107246403B (en) * | 2017-07-06 | 2023-09-05 | 邯钢集团邯宝钢铁有限公司 | Shaft end sealing device of acid mist fan |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07174262A (en) * | 1993-12-22 | 1995-07-11 | Fuji Electric Co Ltd | Thermo-sensitive safety valve and eddy blower having this safety valve |
| CN2245693Y (en) * | 1995-10-10 | 1997-01-22 | 向可为 | Pressure balance shaft gland |
| CN2373638Y (en) * | 1999-04-10 | 2000-04-12 | 符世朝 | Floating shaft seal |
-
2005
- 2005-10-27 CN CNB2005100307701A patent/CN100370147C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103899577A (en) * | 2012-12-28 | 2014-07-02 | 上海宝钢工业技术服务有限公司 | Coal gas pressurizing fan |
| CN106122078A (en) * | 2016-08-30 | 2016-11-16 | 湖北双剑鼓风机股份有限公司 | The asymmetric carbon ring seal device of card slot type for centrifugal blower |
| CN107120306A (en) * | 2017-05-09 | 2017-09-01 | 福建东亚环保科技股份有限公司 | A kind of blower fan of sealing structure and the application sealing structure |
| CN107120306B (en) * | 2017-05-09 | 2019-02-05 | 福建东亚环保科技股份有限公司 | A kind of sealing structure and the blower using the sealing structure |
| CN107246403B (en) * | 2017-07-06 | 2023-09-05 | 邯钢集团邯宝钢铁有限公司 | Shaft end sealing device of acid mist fan |
| CN107676295A (en) * | 2017-11-20 | 2018-02-09 | 南通大通宝富风机有限公司 | A kind of novel casing shaft seal structure |
| CN112943674A (en) * | 2021-02-03 | 2021-06-11 | 健龙(海宁)机械工业有限公司 | Dry dust removal fan for converter gas |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100370147C (en) | 2008-02-20 |
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Granted publication date: 20080220 Termination date: 20101027 |