CN108825549A - A kind of centrifugal pump radial seal ring with airfoil type guide vane - Google Patents
A kind of centrifugal pump radial seal ring with airfoil type guide vane Download PDFInfo
- Publication number
- CN108825549A CN108825549A CN201810409124.3A CN201810409124A CN108825549A CN 108825549 A CN108825549 A CN 108825549A CN 201810409124 A CN201810409124 A CN 201810409124A CN 108825549 A CN108825549 A CN 108825549A
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- CN
- China
- Prior art keywords
- impeller
- guide vane
- radial
- centrifugal pump
- disk
- 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.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/086—Sealings especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention discloses a kind of centrifugal pump radial seal ring with airfoil type guide vane being assemblied between the spiral case of centrifugal pump and impeller, by disk and radial water conservancy diversion blade group at, the along the circumferential direction multiple radial guide vanes of uniform fixed and arranged in the side disk of disk, the appearance profile of the radial section of radial guide vane is airfoil type；Disk is fixedly connected on spiral case, and radial water conservancy diversion blade face keeps Δ=0.5~1mm axial gap towards impeller and with the front cover plate end face of impeller；The present invention is a kind of contactless sealing device, using radial water conservancy diversion direction, when centrifugal pump impeller rotation, the liquid in rotation between impeller and spiral case is driven, rotating liquid generates directed flow under the induction of fixed radial guide vane, the direction of motion of leak fluid is on the contrary, to achieve the purpose that fluid is prevented to reveal from impeller and spiral case gap location between induction direction and impeller and spiral case.
Description
Technical field
The present invention relates to the centrifugal pump structure in field of fluid machinery, the specifically apex combustion seal of centrifugal pump, installations
Gap location between spiral case and impeller, for preventing the fluid between spiral case and impeller from leaking.
Background technique
Centrifugal pump is as a kind of typical blade fluid machinery, its working principle is that being rotated by prime mover driven impeller
It does work to fluid, mechanical energy is converted to the kinetic energy and pressure energy of fluid, to realize the conveying of fluid.Centrifugal pump impeller does merits and demerits
Inevitably along with energy loss in journey, energy loss is broadly divided into three types：Flow losses, volumetric loss and disk
Friction loss.Wherein, volumetric loss refers to through flow loss caused by the leakage between wheel rotation and shell, leakage rate with
The pressure difference for acting on gap both ends is related with interstitial structure, therefore sealing device is arranged in the position revealed.At present
Between spiral case and impeller there are two types of common sealing means：First is that by the way that the leakage gap setting between choma and impeller is existed
One lesser range；Second is that labyrinth seal is used by the complicated sealing structure of setting, but when gap setting very little
Serious wear, stability will be deteriorated, and excessively complicated sealing structure is also unfavorable for processing and assemble.
Currently, in order to solve to reduce gap bring serious wear, a series of problems, such as assembly difficulty, proposing can be
Guarantee the non-contacting sealing structure of good sealing performance under larger gap.Such as Chinese Patent Application No. is
A kind of efficient centrifugal pump of the impeller with non-contact seals function is proposed in 201420065364.3 document, in impeller two sides
The wear-resisting ring inner surface of the pump housing to match with impeller ring built in the ring-like impeller sealing ring and the pump housing of extension processes screw thread, reaches
To reducing or prevent the leakage generated at impeller ring radial clearance, but the processing technology of impeller itself is with regard to more complicated,
Ring outer surface processing screw thread is sealed other than it will increase difficulty of processing at it, also will affect the hydraulic performance of impeller；Thread seal
Abrasion can be generated in use, entire impeller is needed replacing once excessive wear, this will increase maintenance cost.
Summary of the invention
The object of the present invention is to provide a kind of radial seal ring of centrifugal pump, which uses airfoil type radial direction water conservancy diversion leaf
Piece generates the flowing contrary with revealing to prevent fluid from flowing out from spiral case and impeller clearance, so that volumetric loss is reduced,
Improve the volumetric efficiency of centrifugal pump.
To achieve the above object, the technical solution adopted by the present invention is that：The present invention is assemblied in the spiral case and impeller of centrifugal pump
Between, by disk and radial water conservancy diversion blade group at the along the circumferential direction multiple diameters of uniform fixed and arranged in the side disk of disk
To guide vane, the appearance profile of the radial section of radial guide vane is airfoil type.
Further, disk is fixedly connected on spiral case, radial water conservancy diversion blade face towards impeller and with the front shroud end of impeller
Face keeps Δ=0.5~1mm axial gap.
Further, the inner radii r of disk is the half of diameter at impeller inlet, outer radii R is radius r
1.5~2 times, 0.25~0.35 times that axial height b is radius r.
Further, the quantity of radial guide vane than impeller 5 the number of blade more than one.
Further, the airfoil type of radial guide vane is RAF-6E aerofoil profile, NACA aerofoil profile.
Further, the length of blade L of radial guide vane is 1.9~2.2 times of radius r, the height h in axial direction is half
0.15~0.2 times of diameter r, outlet laying angle β be 60 °~75 °.
The beneficial effects of the invention are as follows：
1, the present invention is the sealing ring based on radial guiding stream mechanism, when centrifugal pump impeller rotation, has driven impeller and snail
Liquid in rotation between shell, rotating liquid generate directed flow under the induction of fixed radial guide vane, induce direction
The direction of motion of leak fluid to reach on the contrary, prevent fluid from revealing from impeller and spiral case gap location between impeller and spiral case
Purpose.With conventional seals using labyrinth and compared with reducing by the way of leakage gap, the present invention is used with airfoil type
The sealing ring induction leak fluid of radial guide vane carries out counter motion, and the radial clearance in conventional seals is changed into axial direction
Gap, can be good in biggish axial gap, that is, front shroud of impeller end face and guarantee centrifugal pump in the discontiguous situation of disk
Sealing performance, while also having many advantages, such as easy to implement, it replaces simple.
2, the present invention is that the contactless sealing device of one kind is equivalent to and sealing surface is arranged using radial water conservancy diversion direction
In radial direction, this sealing means not only increase sealing surface, also by radial direction guide vane the performance of sealing are mentioned
It rises.Under similar circumstances, the present invention can guarantee good sealing when sealing ring and impeller axial direction clearance delta=0.5~1mm
Performance not only reduces processing and assembly difficulty in this way, can also substantially reduce the abrasion of sealing ring in use, and extending it makes
Use the service life.And under similar circumstances, maximal clearance permissible value of the present invention is greater than conventional seals choma, traditional sealing opening ring
For nominal diameter in 120~150mm, the permissible value in choma and impeller radius direction gap is 0.07~0.44mm, after abrasion
Maximum permissible value is 0.6mm.
Detailed description of the invention
Fig. 1 is that a kind of stereochemical structure of centrifugal pump radial seal ring with airfoil type guide vane of the present invention is shown
It is intended to；
Fig. 2 is the enlarged drawing of structure of the invention main view shown in Fig. 1；
Fig. 3 is the bottom view of Fig. 2；
Fig. 4 be when the present invention shown in Fig. 1 is mounted on centrifugal pump with the assembling structure half-sectional view of impeller and spiral case；
Fig. 5 is the enlarged drawing of part A in Fig. 4；
In figure：1. disk；2. radial guide vane；3. countersunk screw hole；4. spiral case；5. impeller.
Specific embodiment
Referring to shown in Fig. 1-2, the present invention is made of disk 1 and radial guide vane 2, the middle center Xing You of disk 1
Through-hole.The along the circumferential direction multiple radial guide vanes 2 of uniform fixed and arranged in the side disk of disk 1, radial guide vane 2
It is axially protruded in the disk of disk 1, the appearance profile shape of the radial section of radial guide vane 2 is airfoil type.In circle
Several countersunk screw holes 3 are processed in the disk of disk 1, are used for fixed disc 1.The inner face of radial guide vane 2 and disk 1
Inner ring is concordant.
It is mounted between the spiral case 4 of centrifugal pump and impeller 5 with Fig. 5, the present invention, is required in disk 1 when installation referring to fig. 4
Mandrel is conllinear with the central axis of impeller 5, and disk 1 is fixedly connected on spiral case 4 at countersunk screw hole 3 by sunk screw,
Radial guide vane 2 faces impeller 5, and the front cover plate end face of radial guide vane 2 and impeller 5 keeps Δ=0.5~1mm
Axially mounted gap, radial guide vane 2 are not contacted with the front cover plate end face of impeller 5.
The inner radii r of disk 1 determines that radius r is 5 entrance diameter of impeller according to the internal diameter of impeller 5 and spiral case 4
Half, the radius R of the outer ring of disk 1 is 1.5~2 times of radius r, and the height b in the axial direction of disk 1 is radius r's
0.25~0.35 times.
The quantity of radial guide vane 2 is determined according to the number of blade of impeller 5, adds one for the number of blade of impeller 5, than impeller 5
The number of blade more one.
The airfoil type structure of radial guide vane 2 is chosen according to the hydraulic characteristic(s) of different centrifugal pumps, more common machine
Aerofoil profile has RAF-6E aerofoil profile, NACA aerofoil profile etc..
Referring to figs. 2 and 3, length of blade, that is, aerofoil profile chord length L of radial guide vane 2 is 1.9~2.2 times of radius r,
Height h in the axial direction of radial guide vane 2 is 0.15~0.2 times of radius r.The outlet laying angle β of radial guide vane 2 is
The angle of radial 2 surface tangent of guide vane and disk 1 circumferentially between clockwise direction tangent line is 60 °~75 °.
When being centrifuged pump work, it is to be done work by the rotation of prime mover driven impeller 5 to fluid, converts fluid for mechanical energy
Kinetic energy and pressure energy, to realize the conveying of fluid.In the process, most of liquid can be excluded from pump discharge, but still be had
Sub-fraction liquid is flowed out from the gap location of impeller 5 and spiral case 4, forms volumetric loss.Therefore pacify between impeller 5 and spiral case 4
The present invention is filled to seal.When impeller 5 rotates, the liquid in rotation between impeller 5 and spiral case 4 is driven, rotating liquid is fixed
Directed flow is generated under the pumping of airfoil type radial direction guide vane 2, pumps leak fluid between direction and impeller 5 and spiral case 4
The direction of motion reduces the purpose of volumetric loss on the contrary, to reach prevention fluid from impeller 5 and the leakage of 4 gap location of spiral case.Simultaneously
The present invention guarantees under 5 front cover plate end face of biggish axial gap Δ=0.5~1mm, that is, impeller and the discontiguous situation of disk 1
The good sealing performance of centrifugal pump.
Claims (6)
1. a kind of centrifugal pump radial seal ring with airfoil type guide vane is assemblied in the spiral case (4) and impeller (5) of centrifugal pump
Between, it is characterized in that：It is made of disk (1) and radial guide vane (2), in the side disk of disk (1) along the circumferential direction
The uniform multiple radial guide vanes (2) of fixed and arranged, the appearance profile of the radial section of radial guide vane (2) is airfoil type.
2. a kind of centrifugal pump radial seal ring with airfoil type guide vane according to claim 1, it is characterized in that：Circle
Disk (1) is fixedly connected on spiral case (4), and radial guide vane (2) faces impeller (5) and protects with the front cover plate end face of impeller (5)
Hold Δ=0.5~1mm axial gap.
3. a kind of centrifugal pump radial seal ring with airfoil type guide vane according to claim 1, it is characterized in that：Circle
1.5~2 times, the axial direction that the inner radii r of disk (1) is the half of impeller (5) entrance diameter, outer radii R is radius r
On height b be 0.25~0.35 times of radius r.
4. a kind of centrifugal pump radial seal ring with airfoil type guide vane according to claim 1, it is characterized in that：Diameter
To guide vane (2) quantity than impeller 5 the number of blade more than one.
5. a kind of centrifugal pump radial seal ring with airfoil type guide vane according to claim 1, it is characterized in that：Diameter
Airfoil type to guide vane (2) is RAF-6E aerofoil profile, NACA aerofoil profile.
6. a kind of centrifugal pump radial seal ring with airfoil type guide vane according to claim 1, it is characterized in that：Diameter
Length of blade L to guide vane (2) is 1.9~2.2 times of radius r, the height h in axial direction is the 0.15~0.2 of radius r
Again, outlet laying angle β is 60 °~75 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810409124.3A CN108825549B (en) | 2018-05-02 | 2018-05-02 | Radial sealing ring of centrifugal pump with wing type guide vanes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810409124.3A CN108825549B (en) | 2018-05-02 | 2018-05-02 | Radial sealing ring of centrifugal pump with wing type guide vanes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108825549A true CN108825549A (en) | 2018-11-16 |
| CN108825549B CN108825549B (en) | 2020-03-31 |
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ID=64147353
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810409124.3A Active CN108825549B (en) | 2018-05-02 | 2018-05-02 | Radial sealing ring of centrifugal pump with wing type guide vanes |
Country Status (1)
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| CN (1) | CN108825549B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4242039A (en) * | 1977-11-22 | 1980-12-30 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Pump impeller seals with spiral grooves |
| US20040067132A1 (en) * | 2002-07-08 | 2004-04-08 | Addie Graeme R. | Self-compensating clearance seal for centrifugal pumps |
| DE102016003180A1 (en) * | 2016-03-16 | 2017-09-21 | Ksb Aktiengesellschaft | Centrifugal pump with an arrangement for reducing a backflow |
| CN107228196A (en) * | 2017-07-06 | 2017-10-03 | 浙江工业大学 | Augmentation of heat transfer type ternary bending micro-bulge end surface mechanical sealing structure |
| CN107355530A (en) * | 2017-08-17 | 2017-11-17 | 四川日机密封件股份有限公司 | The sealing ring and its sealing device of non-contact zero leakage |
-
2018
- 2018-05-02 CN CN201810409124.3A patent/CN108825549B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4242039A (en) * | 1977-11-22 | 1980-12-30 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Pump impeller seals with spiral grooves |
| US20040067132A1 (en) * | 2002-07-08 | 2004-04-08 | Addie Graeme R. | Self-compensating clearance seal for centrifugal pumps |
| DE102016003180A1 (en) * | 2016-03-16 | 2017-09-21 | Ksb Aktiengesellschaft | Centrifugal pump with an arrangement for reducing a backflow |
| CN107228196A (en) * | 2017-07-06 | 2017-10-03 | 浙江工业大学 | Augmentation of heat transfer type ternary bending micro-bulge end surface mechanical sealing structure |
| CN107355530A (en) * | 2017-08-17 | 2017-11-17 | 四川日机密封件股份有限公司 | The sealing ring and its sealing device of non-contact zero leakage |
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| Publication number | Publication date |
|---|---|
| CN108825549B (en) | 2020-03-31 |
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