CN102705246A - Impeller-suspended superminiature pump - Google Patents
Impeller-suspended superminiature pump Download PDFInfo
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- CN102705246A CN102705246A CN2012101404361A CN201210140436A CN102705246A CN 102705246 A CN102705246 A CN 102705246A CN 2012101404361 A CN2012101404361 A CN 2012101404361A CN 201210140436 A CN201210140436 A CN 201210140436A CN 102705246 A CN102705246 A CN 102705246A
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- impeller
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- front shroud
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Abstract
The invention relates to a vane type superminiature pump with no mechanical shaft, no leakage and no contact between fluid and the outside of the pump, in particular to an impeller-suspended superminiature pump. The impeller-suspended superminiature pump is technically characterized in that a motor stator of the superminiature pump is embedded into a pump casing, a permanent magnet is embedded into a front shroud of an impeller, and the motor stator and the permanent magnet are oppositely arranged to jointly form a motor structure of a pump unit. An axial clearance is reserved between a pump casing axial inner surface and an impeller front shroud axial outer surface, and fluid dynamic pressure support for restraining axial motion of the impeller can be formed during normal operation of the pump. A radial clearance is reserved between an impeller front shroud radial outer surface and a pump casing radial inner surface, and fluid dynamic pressure support for restraining radial motion of the impeller can be formed during normal operation of the pump. Therefore, the impeller can suspend in a pump cavity during normal operation. By the impeller-suspended superminiature pump, a fine flow condition can be effectively formed in the inner cavity of the pump casing, so that hydraulic efficiency of the pump can be improved, controllability of flow design can be improved, and the structural size of the superminiature pump can be further decreased.
Description
Technical field
The present invention relates to a kind of blade type miniature pump; Be particularly related to a kind ofly be suitable for not having external mechanical axis, the extraneous contactless blade type microminiature pump of fluid ne-leakage, fluid and pump, be applicable to the fluid delivery system in fields such as extracorporeal circulation of blood device, artificial heart, Aero-Space, fine chemistry industry and bio-pharmaceuticals.
Background technique
The blade type microminiature pump that uses at present mainly contains according to the supporting structure of impeller: the form of external mechanical axis, and maglev form.To the blade type microminiature pump of external mechanical axis is arranged, owing to adopt mechanical seal or other gland seal device, the fluid in the pump and the outside of pump can not isolate fully, can not effectively prevent seepage or the pump inner fluid and extraneous contacting of fluid; To using maglev blade type microminiature pump, though can solve fluid leaks, pump inner fluid and the extraneous problem that contacts, control is complicated, and easy back shroud side formation stagnant area at pump impeller.For this reason, ZL200710062857.6 and ZL200910084273.8 have adopted the structure of double-sucking type, can eliminate the stagnant area in the runner, and guarantee axial force balance automatically.But, cause the microminiature pump shaft bigger to size owing to adopted the structure of double-sucking type; Pump has two imports, and is convenient inadequately when using such as occasions such as extracorporeal circulation of blood devices; Gap runner between double suction rotor and the pump case is longer, will cause bigger frictionally damage.When as blood pump or artificial heart use, cause haemolysis etc. easily.Therefore, the microminiature pump application in a lot of fields of double-sucking type structure receives certain restriction.
Summary of the invention
The objective of the invention is to propose a kind of microminiature pump of impeller suspended; This structure is except effectively satisfying blade type microminiature pump ne-leakage, no stagnant area, pump inner fluid and extraneous contactless requirement; Also need improve flowing in the gap runner between rotor and the pump case; Improve the efficient of pump, simplify the pump group structure, alleviate the quality of pump group.In addition, also must improve organization plan, improve the startability of pump, improve the operation stability of pump on the whole.
Technological scheme of the present invention is following:
A kind of microminiature pump of impeller suspended comprises pump case, impeller, pumping chamber, Pump Suction Nozzle and pump discharge, and described impeller is arranged in the pumping chamber, and pump case, impeller and pumping chamber constitute the flow channel of pump; Described impeller comprises front shroud of impeller and blade; It is characterized in that: described microminiature pump also comprises permanent magnet that is embedded in the front shroud of impeller and the motor stator that is embedded in the pump case, and permanent magnet and motor stator be positioned opposite vertically, forms electric machine structure jointly; There is axial clearance between axial internal surface of pump case and the front shroud of impeller axial external surface; There is radial clearance between front shroud of impeller radially-outer surface and the pump case inner radial surface.
Technical characteristics of the present invention also is: be provided with centered cylinder and pump case floor in the described pump case, centered cylinder links into an integrated entity via pump case floor and pump case; Be provided with impeller support cylinder and impeller floor in the center portion of impeller, the impeller support cylinder links into an integrated entity via impeller floor and front shroud of impeller; Centered cylinder and impeller support cylinder be positioned opposite vertically; Described impeller support cylinder is positioned at the end of impeller near pump case; Described centered cylinder is positioned at the end near impeller.
Another technical characteristics of the present invention is: described impeller support cylinder top is for semicircle or conical.
The present invention compared with prior art has the following advantages and technique effect: the stator and the permanent magnet that 1. are embedded in pump case, front shroud of impeller are respectively formed drives impeller motor rotating structure, help forming succinct and compact pump group unitary construction.Than other forms of microminiature pump, the present invention utilizes the space of pump inlet place that motor stator is set, and helps dwindling the axial dimension of pump structure, has small and exquisite, compact advantage more.2. on structural design, the present invention is provided with axial clearance between the outer surface of the internal surface of pump case and front shroud of impeller, between the internal surface of the outer surface of front shroud of impeller and pump case, has radial clearance.When pump normally moved, above-mentioned gap formed the axial liquid hydraulic bearing that supports impeller and hydrodynamic bearing radially respectively, plays the effect of impeller at the setting-out indoor location that limit.And, because these two gap runners are shorter, can guarantee from pump inlet the stagnant area of flowing in the whole runners to outlet on the one hand, also make on the other hand flow in the pump more unobstructed, controllability is better.When the microminiature pump uses as blood pump, can obtain better physiological compatibility.The hydrodynamic bearing that forms between front shroud of impeller and the pump case both can use separately, also can unite use with the magnetic bearing that the permanent magnet on motor stator and controller and the rotor is formed, and realized the suspension supporting of impeller.This bearing with Hydrodynamic float is better than the self-tuning performance of general magnetic suspension bearing, thereby can make the running of pump safer, reliable.3. in the pump startup stage,, the impeller support cylinder is contacted with the centered cylinder of pump case, form a pair of friction pair to support impeller because impeller is pressed close to pump case under the action of a magnetic field.Because the area of contact of impeller support cylinder and centered cylinder is very little, the moment in the time of can significantly reducing pump startup, thereby the startup rotating speed of reduction pump; When pump runs well; Can form liquid film (" oil film " of similar rolling bearing) between the end face of front shroud of impeller and side and the pump case inwall; Make the centered cylinder of impeller support cylinder disengaging pump case under the dynamic pressure effect, avoid the wearing and tearing of pump component, prolong the working life of pump.4. because impeller support cylinder top be semicircle or taper shape, make impeller the start up period and the area of contact of pump case further reduce.
Generally; The microminiature pump of the impeller suspended of the present invention's design is except effectively satisfying blade type microminiature pump ne-leakage, no stagnant area, pump inner fluid with extraneous contactless; And outside mobile smooth and easy etc. the requirement in the gap runner between rotor and the pump case, mainly be to have simplified the microminiature pump structure, both reduced the boundary dimension of microminiature pump greatly; Also help improving the efficient of microminiature pump, and improve the mobile unobstructed property and the operation stability of pump on the whole.
Description of drawings
Fig. 1 is the sectional view of the microminiature pump of a kind of impeller suspended provided by the invention.
Fig. 2 is the K partial view of Fig. 1.
Fig. 3 is the main sectional view of impeller.
Fig. 4 is that the A of Fig. 3 is to view.
Among the figure: the 1-pump case; The 2-motor stator; The 3-outer pipe; The 4-pumping chamber; The 5-blade; The 6-permanent magnet; 7-impeller support cylinder; The 8-front shroud of impeller; 9-impeller floor; The 10-impeller; The 11-centered cylinder; The 12-suction port; 13-pump case floor; The 14-pump discharge; The axial internal surface of 15-pump case; 16-front shroud of impeller axial external surface; 17-front shroud of impeller radially-outer surface; 18-pump case inner radial surface.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention, structure are further described.
Fig. 1 is the sectional view of the microminiature pump of a kind of impeller suspended provided by the invention.This microminiature pump comprises pump case 1, motor stator 2, pumping chamber 4, permanent magnet 6, impeller 10, suction port 12 and pump discharge 14.Impeller 10 is arranged in the pumping chamber 4, and pumping chamber 4 is generally integral structure with outer pipe 3; Pump case, impeller and pumping chamber constitute the flow channel of pump.Impeller 10 comprises front shroud of impeller 8 and blade 5; Permanent magnet 6 is embedded in the front shroud of impeller 8, and motor stator 2 is embedded in the pump case 1, and permanent magnet and motor stator be positioned opposite vertically, forms electric machine structure jointly; There is axial clearance between axial internal surface 15 of pump case and the front shroud of impeller axial external surface 16; There is radial clearance between front shroud of impeller radially-outer surface 17 and the pump case inner radial surface 18.
In pump case 1, be provided with centered cylinder 11 and pump case floor 13, centered cylinder links into an integrated entity via pump case floor and pump case; Be provided with impeller support cylinder 7 and impeller floor 9 in the center portion of impeller, impeller support cylinder 7 links into an integrated entity via impeller floor 9 and front shroud of impeller 8; Center circle 11 and impeller support cylinder 7 be positioned opposite vertically; Described impeller support cylinder 7 is positioned at the end of impeller near pump case 1; Described centered cylinder 11 is positioned at the end near impeller 10.
As shown in Figure 2, there is axial clearance between axial internal surface 15 of pump case and the front shroud of impeller axial external surface 16,, pump can form the hydrodynamic bearing of constraint impeller 10 axial motions when running well.There is radial clearance between front shroud of impeller radially-outer surface 17 and the pump case inner radial surface 18, when pump runs well, can forms the hydrodynamic bearing of constraint impeller 10 radial motions.Impeller support cylinder 7 is preferably semicircle or conical near an end of pump case 1, and protrudes slightly with respect to the position of the axial external surface 16 of front shroud of impeller, with the end positioned opposite of centered cylinder 11 near impeller.
Pump does not structurally have mechanical axis, the hydrodynamic bearing that can form by impeller 10 and pump case 1 corresponding inwall, or unite the magnetic bearing formed by motor stator 2 and permanent magnet 6 impeller 10 is supported in the inner chamber that pump case 1 and pumping chamber 4 form with suspending.Because hydrodynamic bearing can be according to the automatic distance of adjustment and pump case inwall of the instantaneous position of impeller in pump case and pumping chamber, make the running more secure, reliable of pump.Like this, guaranteed pump inner fluid and outside isolation, realized ne-leakage, free of contamination efficient, safe transport from structure.
The working procedure of microminiature pump is following: fluid gets in the microminiature pump from suction port 12, via the flow channel entering impeller 10 of pump case 1.Fluid receives the effect of blade and after pressurizeing, is pooled to gradually the pumping chamber 4 from impeller outlet in impeller, and discharges at pump discharge 14 via outer pipe 3.Pump case floor 13 is by at least 2 and form with respect to the thin plate that the center line of centered cylinder 11 is arranged axisymmetricly, makes that like this to get into the flow of fluid of impeller from pump case more even.Piece number of blade 5 is at least 3, and the sheet number of best and pump case floor is relatively prime.
Can know by Fig. 1, impeller 10 axially with radially size all less than the correspondingly-sized of pump case with pumping chamber formation runner.When pump startup, impeller is attracted to the side near pump case under the action of a magnetic field that permanent magnet 6, motor stator form, and an end of impeller support cylinder 7 contacts with centered cylinder 11, forms a pair of friction pair.After wheel speed increases gradually, will be full of the pressure flow body in the axial clearance between axial internal surface 15 of pump case and the front shroud of impeller axial external surface 16, play the effect of " oil film ", formed axial hydrodynamic bearing like this.Under this axial hydrodynamic bearing effect, front shroud of impeller axial external surface 16 will be pushed away pump case, make impeller support cylinder 7 and centered cylinder 11 disengage.Simultaneously, also will form similarly " oil film " in the radial clearance between front shroud of impeller radially-outer surface 17 and the pump case inner radial surface 18, make the radial position adjustment and reach transient equiliblium automatically of impeller like this.On-stream, make impeller 10 in the inner chamber of pump case 1 and pumping chamber, be in state of suspension.
Claims (3)
1. the microminiature pump of an impeller suspended; Comprise pump case (1), impeller (10), pumping chamber (4), Pump Suction Nozzle (12) and pump discharge (14); Described impeller (10) is arranged in the pumping chamber (4), and pump case (1), impeller and pumping chamber constitute the flow channel of pump; Described impeller (10) comprises front shroud of impeller (8) and blade (5); It is characterized in that: described microminiature pump also comprises permanent magnet (6) motor stator (2) interior with being embedded in pump case (1) that is embedded in the front shroud of impeller (8), and permanent magnet and motor stator be positioned opposite vertically, forms electric machine structure jointly; There is axial clearance between axial internal surface of pump case (15) and the front shroud of impeller axial external surface (16); There is radial clearance between front shroud of impeller radially-outer surface (17) and the pump case inner radial surface (18).
2. according to the microminiature pump of the described impeller suspended of claim 1, it is characterized in that: be provided with centered cylinder (11) and pump case floor (13) in the described pump case (1), centered cylinder (11) links into an integrated entity via pump case floor (13) and pump case (1); Be provided with impeller support cylinder (7) and impeller floor (9) in the center portion of impeller, impeller support cylinder (7) links into an integrated entity via impeller floor (9) and front shroud of impeller (8); Centered cylinder (11) and impeller support cylinder (7) be positioned opposite vertically; Described impeller support cylinder (7) is positioned at the end of impeller near pump case (1); Described centered cylinder (11) is positioned at the end near impeller (10).
3. according to the microminiature pump of the described impeller suspended of claim 2, it is characterized in that: described impeller support cylinder (7) top is for semicircle or conical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210140436.1A CN102705246B (en) | 2012-05-08 | 2012-05-08 | Impeller-suspended superminiature pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210140436.1A CN102705246B (en) | 2012-05-08 | 2012-05-08 | Impeller-suspended superminiature pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102705246A true CN102705246A (en) | 2012-10-03 |
| CN102705246B CN102705246B (en) | 2014-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210140436.1A Expired - Fee Related CN102705246B (en) | 2012-05-08 | 2012-05-08 | Impeller-suspended superminiature pump |
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| CN (1) | CN102705246B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014166128A1 (en) * | 2013-04-07 | 2014-10-16 | 清华大学 | Dynamic-pressure suspension-type double-flow pump |
| CN111902168A (en) * | 2018-03-23 | 2020-11-06 | 阿比奥梅德欧洲股份有限公司 | Intravascular blood pump |
| CN112524038A (en) * | 2019-09-18 | 2021-03-19 | 莱维特朗尼克斯有限责任公司 | Centrifugal pump and pump casing |
| CN112747910A (en) * | 2020-12-11 | 2021-05-04 | 清华大学 | Leakage-free pump dynamic pressure suspension rotor performance detection device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713730A (en) * | 1992-09-04 | 1998-02-03 | Kyocera Corporation | Ceramic pivot bearing arrangement for a sealless blood pump |
| US6071093A (en) * | 1996-10-18 | 2000-06-06 | Abiomed, Inc. | Bearingless blood pump and electronic drive system |
| WO2000032256A1 (en) * | 1998-12-02 | 2000-06-08 | Impella Cardiotechnik Ag | Blood pump without bearing |
| CN1372479A (en) * | 1999-04-23 | 2002-10-02 | 文特拉西斯特股份有限公司 | Rotary blood pump and control system therefor |
| US20060247486A1 (en) * | 2003-07-04 | 2006-11-02 | Nikolaus Mendler | Centrifugal pump |
-
2012
- 2012-05-08 CN CN201210140436.1A patent/CN102705246B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5713730A (en) * | 1992-09-04 | 1998-02-03 | Kyocera Corporation | Ceramic pivot bearing arrangement for a sealless blood pump |
| US6071093A (en) * | 1996-10-18 | 2000-06-06 | Abiomed, Inc. | Bearingless blood pump and electronic drive system |
| WO2000032256A1 (en) * | 1998-12-02 | 2000-06-08 | Impella Cardiotechnik Ag | Blood pump without bearing |
| CN1372479A (en) * | 1999-04-23 | 2002-10-02 | 文特拉西斯特股份有限公司 | Rotary blood pump and control system therefor |
| US20060247486A1 (en) * | 2003-07-04 | 2006-11-02 | Nikolaus Mendler | Centrifugal pump |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014166128A1 (en) * | 2013-04-07 | 2014-10-16 | 清华大学 | Dynamic-pressure suspension-type double-flow pump |
| CN111902168A (en) * | 2018-03-23 | 2020-11-06 | 阿比奥梅德欧洲股份有限公司 | Intravascular blood pump |
| US11951299B2 (en) | 2018-03-23 | 2024-04-09 | Abiomed, Inc. | Intravascular blood pump |
| CN112524038A (en) * | 2019-09-18 | 2021-03-19 | 莱维特朗尼克斯有限责任公司 | Centrifugal pump and pump casing |
| CN112524038B (en) * | 2019-09-18 | 2024-01-30 | 莱维特朗尼克斯有限责任公司 | Centrifugal pump and pump housing |
| CN112747910A (en) * | 2020-12-11 | 2021-05-04 | 清华大学 | Leakage-free pump dynamic pressure suspension rotor performance detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102705246B (en) | 2014-11-26 |
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Granted publication date: 20141126 |