CN102705246B - Impeller-suspended superminiature pump - Google Patents
Impeller-suspended superminiature pump Download PDFInfo
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- CN102705246B CN102705246B CN201210140436.1A CN201210140436A CN102705246B CN 102705246 B CN102705246 B CN 102705246B CN 201210140436 A CN201210140436 A CN 201210140436A CN 102705246 B CN102705246 B CN 102705246B
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- impeller
- pump
- pump case
- front shroud
- superminiature
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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 of contactless blade type mini pump in the external world being suitable for without external mechanical axis, fluid ne-leakage, fluid and pump, be applicable to the fluid delivery system in the fields such as extracorporeal blood circulating device, artificial heart, Aero-Space, fine chemistry industry and bio-pharmaceuticals.
Background technique
The blade type mini pump using at present mainly contains according to the supporting structure of impeller: the form of external mechanical axis, and maglev form.To there being the blade type mini pump of external mechanical axis, owing to adopting mechanical seal or other gland seal device, the fluid in pump and the outside of pump can not isolate completely, can not effectively prevent seepage or the pump inner fluid and extraneous contacting of fluid; To using maglev blade type mini pump, although can solve fluid leaks, pump inner fluid and the extraneous problem contacting, control complexity, and easily form stagnant area in the back shroud side of pump impeller.For this reason, ZL200710062857.6 and ZL200910084273.8 have adopted the structure of double-sucking type, can eliminate the stagnant area in runner, and automatically ensure axial force balance.But owing to having adopted the structure of double-sucking type, cause mini pump axial dimension larger; Pump has two imports, convenient not in the time that the occasion such as such as extracorporeal blood circulating device is used; Gap runner between double suction rotor and pump case is longer, will cause larger frictionally damage.When as blood pump or artificial heart use, easily cause haemolysis etc.Therefore, the application in a lot of fields of the mini pump of double-sucking type structure is subject to certain restrictions.
Summary of the invention
The object of the invention is to propose a kind of mini pump of impeller suspended, this structure is except can effectively meet blade type mini pump ne-leakage, without stagnant area, pump inner fluid and extraneous contactless requirement, also need to improve flowing in the gap runner between rotor and pump case, improve the efficiency of pump, simplify pump group structure, alleviate the quality of pump group.In addition, also must improve organization plan, improve the startability of pump, improve on the whole the operation stability of pump.
Technological scheme of the present invention is as follows:
A mini pump for impeller suspended, comprises pump case, impeller, pumping chamber, Pump Suction Nozzle and pump discharge, and described impeller is arranged in pumping chamber, and pump case, impeller and pumping chamber form the flow channel of pump; Described impeller comprises front shroud of impeller and blade; It is characterized in that: described mini pump also comprises the permanent magnet that is embedded in front shroud of impeller and be embedded in the motor stator in pump case, permanent magnet and motor stator positioned opposite vertically, forms electric machine structure jointly; Between the axial internal surface of pump case and front shroud of impeller axial external surface, there is axial clearance; Between front shroud of impeller radially-outer surface and pump case inner radial surface, there is radial clearance.
Technical characteristics of the present invention is also: in described pump case, be provided with centered cylinder and pump case floor, 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, impeller support cylinder links into an integrated entity via impeller floor and front shroud of impeller; Centered cylinder and impeller support cylinder positioned opposite vertically; Described impeller support cylinder is positioned at impeller one end near pump case; Described centered cylinder is positioned at the one 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: be 1. embedded in respectively the stator of pump case, front shroud of impeller and the electric machine structure of permanent magnet composition drives impeller rotation, be conducive to form succinct and compact pump group unitary construction.Than other forms of mini pump, the present invention utilizes the spatial placement motor stator of pump inlet place, is conducive to dwindle the axial dimension of pump structure, more has small and exquisite, compact advantage.2. in structural design, the present invention is provided with axial clearance between the internal surface of pump case and the outer surface of front shroud of impeller, between the outer surface of front shroud of impeller and the internal surface of pump case, has radial clearance.In the time that pump normally moves, above-mentioned gap forms respectively the axial liquid hydraulic bearing and the hydrodynamic bearing radially that support impeller, plays the effect of impeller at setting-out indoor location that limit.And, because these two gap runners are shorter, can ensure on the one hand the stagnant area of flowing in the whole runners to outlet from pump inlet, also make on the other hand to flow in pump more unobstructed, controllability is better.In the time that mini pump uses as blood pump, can obtain better physiological compatibility.The hydrodynamic bearing forming between front shroud of impeller and pump case both can be used alone, and also can combine use with the magnetic bearing of the permanent magnet composition on motor stator and controller and rotor, realized the suspension bearing 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, because impeller is pressed close to pump case under magnetic fields, impeller support cylinder is contacted with the centered cylinder of pump case, form friction pair to support impeller.Because the area of contact of impeller support cylinder and centered cylinder is very little, the moment can greatly reduce pump startup time, thereby the startup rotating speed of reduction pump; In the time that pump runs well, between the end face of front shroud of impeller and side and pump housing endophragm, can form liquid film (" oil film " of similar rolling bearing), make impeller support cylinder under dynamic pressure effect, depart from the centered cylinder of pump case, avoid the wearing and tearing of pump component, extend the working life of pump.4. because impeller support cylinder top is semicircle or conical, make impeller start up period and the area of contact of pump case further reduce.
Generally, the mini pump of the impeller suspended of the present invention's design is except effectively meeting blade type mini pump ne-leakage, contactless without stagnant area, pump inner fluid and the external world, and outside mobile smooth and easy etc. requirement in gap runner between rotor and pump case, mainly to have simplified microminiature pump structure, both reduced greatly the boundary dimension of mini pump, also be conducive to improve the efficiency of mini pump, and improve on the whole mobile patency and the operation stability of pump.
Brief description of the drawings
Fig. 1 is the sectional view of the mini 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.
In figure: 1-pump case; 2-motor stator; 3-outer pipe; 4-pumping chamber; 5-blade; 6-permanent magnet; 7-impeller support cylinder; 8-front shroud of impeller; 9-impeller floor; 10-impeller; 11-centered cylinder; 12-suction port; 13-pump case floor; 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 mini pump of a kind of impeller suspended provided by the invention.This mini 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 pumping chamber 4, and pumping chamber 4 and outer pipe 3 are generally integral structure; Pump case, impeller and pumping chamber form the flow channel of pump.Impeller 10 comprises front shroud of impeller 8 and blade 5; Permanent magnet 6 is embedded in front shroud of impeller 8, and motor stator 2 is embedded in pump case 1, and permanent magnet and motor stator positioned opposite vertically, forms electric machine structure jointly; Between the axial internal surface 15 of pump case and front shroud of impeller axial external surface 16, there is axial clearance; Between front shroud of impeller radially-outer surface 17 and pump case inner radial surface 18, there is radial clearance.
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 positioned opposite vertically; Described impeller support cylinder 7 is positioned at impeller one end near pump case 1; Described centered cylinder 11 is positioned at the one end near impeller 10.
As shown in Figure 2, between the axial internal surface 15 of pump case and front shroud of impeller axial external surface 16, there is axial clearance, in the time that pump runs well, can form the hydrodynamic bearing of constraint impeller 10 axial motions.Between front shroud of impeller radially-outer surface 17 and pump case inner radial surface 18, there is radial clearance, in the time that pump runs well, can form the hydrodynamic bearing of constraint impeller 10 radial motions.Impeller support cylinder 7 is preferably semicircle or conical near one end of pump case 1, and slightly protrudes with respect to the position of the axial external surface 16 of front shroud of impeller, with one end positioned opposite of centered cylinder 11 near impeller.
Pump does not structurally have mechanical axis, the hydrodynamic bearing that can be formed by impeller 10 inwall corresponding with pump case 1, or combine the magnetic bearing that formed by motor stator 2 and permanent magnet 6 impeller 10 is suspended and is supported in the inner chamber that pump case 1 and pumping chamber 4 form.Due to hydrodynamic bearing can be according to impeller the instantaneous position in pump case and pumping chamber automatically adjust and the distance of pump housing endophragm, make running more secure, reliable of pump.Like this, ensure pump inner fluid and outside isolation from structure, realized ne-leakage, free of contamination efficient, safe transport.
The working procedure of mini pump is as follows: fluid enters in mini pump from suction port 12, enters impeller 10 via the flow channel of pump case 1.Fluid is subject to the effect of blade and after pressurizeing, is pooled to gradually pumping chamber 4 from impeller outlet in impeller, and discharges at pump discharge 14 via outer pipe 3.Pump case floor 13 is made up of at least 2 and the thin plate arranged axisymmetricly with respect to the center line of centered cylinder 11, and the flow of fluid that makes like this to enter from pump case impeller is more even.A piece number for blade 5 is at least 3, and the sheet number of best and pump case floor is relatively prime.
As shown in Figure 1, impeller 10 is axially all being less than the correspondingly-sized of pump case and pumping chamber formation runner with size radially.In the time of pump startup, under the magnetic fields that impeller forms at permanent magnet 6, motor stator, be attracted to the side near pump case, one end of impeller support cylinder 7 contacts with centered cylinder 11, forms friction pair.After wheel speed increases gradually, in the axial clearance between the axial internal surface 15 of pump case and front shroud of impeller axial external surface 16, will be filled with hydraulic fluid, play the effect of " oil film ", form so axial hydrodynamic bearing.Under this axial hydrodynamic bearing effect, front shroud of impeller axial external surface 16 will pushed away from pump case, and impeller support cylinder 7 and centered cylinder 11 are disengaged.Meanwhile, also will form similarly " oil film " in the radial clearance between front shroud of impeller radially-outer surface 17 and pump case inner radial surface 18, the radial position that makes like this impeller is automatically adjusted and is reached transient equiliblium.On-stream, make impeller 10 in the inner chamber of pump case 1 and pumping chamber in state of suspension.
Claims (2)
1. the mini 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 pumping chamber (4), and pump case (1), impeller and pumping chamber form the flow channel of pump; Described impeller (10) comprises front shroud of impeller (8) and blade (5); It is characterized in that: described mini pump also comprises and is embedded in the permanent magnet (6) in front shroud of impeller (8) and is embedded in the interior motor stator (2) of pump case (1), permanent magnet and motor stator positioned opposite vertically, forms electric machine structure jointly; Between the axial internal surface of pump case (15) and front shroud of impeller axial external surface (16), there is axial clearance; Between front shroud of impeller radially-outer surface (17) and pump case inner radial surface (18), there is radial clearance; In described pump case (1), be provided with centered cylinder (11) and pump case floor (13), 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) positioned opposite vertically; Described impeller support cylinder (7) is positioned at impeller one end near pump case (1); Described centered cylinder (11) is positioned at the one end near impeller (10).
2. according to the mini pump of impeller suspended claimed in claim 1, 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 CN102705246A (en) | 2012-10-03 |
| CN102705246B true 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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| Country | Link |
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| CN (1) | CN102705246B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103216453A (en) * | 2013-04-07 | 2013-07-24 | 清华大学 | Hydrodynamic pressure suspension double-flow pump |
| DK3542837T3 (en) | 2018-03-23 | 2020-09-21 | Abiomed Europe Gmbh | INTRAVASCULAR BLOOD PUMP |
| EP3795836A1 (en) * | 2019-09-18 | 2021-03-24 | Levitronix GmbH | Centrifugal pump and pump housing |
| CN112747910B (en) * | 2020-12-11 | 2022-03-18 | 清华大学 | Leakage-free pump dynamic pressure suspension rotor performance detection device |
Citations (4)
| 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 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10330434A1 (en) * | 2003-07-04 | 2005-02-03 | Jostra Ag | Centrifugal pump |
-
2012
- 2012-05-08 CN CN201210140436.1A patent/CN102705246B/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102705246A (en) | 2012-10-03 |
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Granted publication date: 20141126 |
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