CN102628446B - Centrifugal vacuum pump and the method for producing negative pressure - Google Patents
Centrifugal vacuum pump and the method for producing negative pressure Download PDFInfo
- Publication number
- CN102628446B CN102628446B CN201210022549.1A CN201210022549A CN102628446B CN 102628446 B CN102628446 B CN 102628446B CN 201210022549 A CN201210022549 A CN 201210022549A CN 102628446 B CN102628446 B CN 102628446B
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- centrifugal
- impeller
- pump
- quill shaft
- vacuum pump
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/168—Pumps specially adapted to produce a vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
- F04D17/165—Axial entry and discharge
-
- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/053—Shafts
-
- 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
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
Abstract
The present invention relates to a kind of centrifugal vacuum pump, it includes shell (1) and centrifugal pump impeller (5,6,7), described centrifugal pump impeller (5,6,7) is rotatably installed in described inside the shell by axle (2) and has multiple airflow paths being about radially arranged, airflow path is fluidly connected to, in its radial inner end, the aspiration (12) extending in described shell, and is fluidly connected at least one air outlet slit (16,17) stretching out described shell in its radial outer end.According to the present invention, described axle is quill shaft (2), multiple holes (9) are formed in the cylinder of described quill shaft (2), the inside (10) of described quill shaft is fluidly connected to airflow path (8) via the plurality of hole (9), and aspiration (12) is fluidly connected to the inside of described quill shaft.The invention still further relates to a kind of method producing negative pressure.
Description
Technical field
The present invention relates to a kind of method according to centrifugal vacuum pump as described below and for producing negative pressure：A kind of centrifugation
Vacuum pump, including shell and centrifugal pump impeller, centrifugal pump impeller is rotatably installed in inside the shell by axle and has multiple
The airflow path being about radially arranged, airflow path is fluidly connected to the suction extending in shell in its radial inner end
Pipeline, and fluidly it is connected at least one air outlet slit stretching out shell in its radial outer end.One kind is produced by impeller of pump
The method of raw negative pressure, impeller of pump is rotatably installed in inside the shell by axle and has multiple air streams being about radially arranged
Passage, air is radially therefrom the inner by centrifugal force and is transported to its radial outer end by airflow path.
Background technology
Electric vacuum pump for being supplied to the brake booster in motor vehicles is typically vane pump or barrier film
The form of piston pump.However, the operation principle of these pumps has a large amount of shortcomings：Vane pump is had limited due to blade wear
In the life-span, there is due to overheated danger limited continuous operating time, and particularly because a large amount of between blade and case
Rub and there is poor efficiency.The service life of diaphragm pistonpump is than the long service life of vane pump, but equally limited, especially
It is the embrittlement due to barrier film.Additionally, diaphragm pistonpump at low temperature, especially has high power consumption below -40 DEG C, tool
There is larger space requirement, and because rotary motion stands frictional dissipation to the necessary conversion of lengthwise movement.
All conventional electric vacuum pumps all there is poor efficiency that is to say, that during the run time of pump institute complete
The vacuum work(becoming is relatively low with the ratio of the electrical power being consumed.
Known basis centrifugal vacuum pump as above from DE 197 25 335 A1.Propose use in the publication
Centrifugal vacuum pump is as the negative pressure source for brake booster.Centrifugal vacuum pump described in this article comprises the annular around axle
Chamber；On the one hand, aspiration is passed in this annular chamber, on the other hand, the footpath of the airflow path being formed by the blade bending
Inboard end is adjacent with this annular chamber.In this annular chamber, air to be pumped axially and radially flows to axle, thus promoting rapids
The formation of stream.Blade is relatively short and therefore airflow path is relatively short.In addition, blade must move through consolidating of shell
Determine surface, and because the gap between them can not be obtained infinitely in the case of not producing friction or excessive friction
Little, so the air of pumping can be back in the relatively area of low pressure of this position.All these efficiency and obtainable of limiting
Pressure reduction.
Content of the invention
The purpose of the present invention is to improve the efficiency of centrifugal vacuum pump and obtainable pressure reduction.
This purpose is passed through for producing the conventional method of negative pressure and true in general centrifugation by part as described below
It is achieved in empty pump：Axle is quill shaft, and multiple holes are formed in the cylinder of quill shaft, and the inside of quill shaft is flowed via multiple holes
It is connected to airflow path logically, and wherein aspiration is fluidly connected to the inside of quill shaft, the leaf of centrifugal pump impeller
The front of the direction of rotation with respect to centrifugal pump impeller of piece than centrifugal pump impeller blade with respect to centrifugal pump impeller rotation
The back side in direction is short.Wherein it is allowed to multiple holes that air to be pumped axial cavity from axle passes through in axle flow into air circulation
Road.
In the present case, axle forms a part for aspiration, in aspiration, air to be pumped and axle
Essentially coaxially flow, then at multiple holes, deflect into airflow path.Axially and radially air stream thus with promote flow
Mode separate, thus offsetting turbulent flow.It is used for axial air by using the inside of axle to supply, for the identical periphery of pump impeller
Long, airflow path can be longer than above-mentioned prior art.Axially directed due to intake air, the air of pumping is certainly only
Deflection deflects about 90 degree with the axis with respect to axle twice, rather than deflects three times in the prior art as above-mentioned.Relatively
Air-tightness between part movable each other can provide simply by the sealing between shell and axle, this sealing by
Can easily and almost frictionally not realize in the relatively small radius of axle.
All these efficiency all very significantly improving centrifugal vacuum pump and obtainable pressure reduction, therefore, the present invention
It is particularly suitable as the electric drive vacuum pump for supplying negative pressure to brakes.Improved efficiency makes it possible in minimizing has
Burn engine or motor or there are explosive motor and the motor vehicles of motor (as in motor vehicle driven by mixed power)
Fuel and energy expenditure.
However, substantial amounts of other application is also had according to the principle of the pump of the present invention, for negative to equipment or machine supply
Pressure or extract for air, term " air " here not only includes the admixture of gas being present in earth atmosphere, also includes
Other gases or the mixture of gas.
In a preferred embodiment, centrifugal pump impeller is the pump impeller of closing；That is, except its radial inner end and outer end it
Outward, the airflow path of centrifugal pump impeller is to close so that the air of outflow can not be along the length of airflow path everywhere
Degree enters from any position or escapes.
In a preferred embodiment of the invention, contrary with the centrifugal fan of above-mentioned prior art or routine (wherein, air stream
Passage follows the path of about bending in impeller of pump and its transversal outward facing sides broadens), the airflow path of centrifugal pump impeller
Substantially extend with linearly leaving Axial and radial, and there is essentially identical cross section along its length.Flow through this straight channel
The maximum acceleration of air experience, and because the flow cross section of passage does not radially increase, so the horizontal stroke with passage
The situation cutting outward facing sides increase is compared, and the speed of the air conveying wherein reduces less.This two measures all increase
Obtainable pressure reduction.
Centrifugal vacuum pump can be made to reach high rotation speed by motor, at a high rotational speed, produce enough to system
Dynamic booster supplies pump power and the pressure reduction of negative pressure.When using in the motor vehicle, centrifugal vacuum pump can be alternatively
Mechanically to be driven by any auxiliary equipment of explosive motor or explosive motor.
According to the present invention, turbine wheel can also be the form of integrated radial/axial turbine wheel.In this feelings
Under condition, the central axial axle of hollow is connected to the feature inner chamber of integrated radial/axial turbine wheel.Air is via hollow
Axial axis be extracted by turbine wheel.
When integrated radial/axial turbine wheel uses in the vacuum pump according to the present invention, turbine wheel is
Air stream is made to deflect.Complicated and high cost sheet metal induction element is therefore not required in that.Redundancy for quill shaft is close
The lip seal of envelope is also dispensed with.Axial air outlet on both sides can be substituted by the air outlet slit on side.Annular air
Outlet can be save, and exports to substitute by cylindrical air.
Brief description
The exemplary embodiment of middle expression is more specifically explained in the present invention with reference to the accompanying drawings, in the accompanying drawings：
Fig. 1 shows the longitudinal section of the centrifugal vacuum pump through the radial turbine impeller with quill shaft and closing；
Fig. 2 a-2c shows the guiding passing through quill shaft, radial turbine impeller and some correlations along the line A-A in Fig. 1
The radial direction partial section of blade, and there are two of the turbine wheel of guide blades of correlation in both embodiments bow
View；
Fig. 3 is the centrifugal vacuum with quill shaft, the radial turbine impeller of closing and additional axial turbine impeller
The schematic diagram of pump；
Fig. 4 shows integrated radial/axial turbine wheel；
Fig. 5 shows the alternative designs of the centrifugal pump according to the present invention.
Specific embodiment
Centrifugal vacuum pump shown in Fig. 1 includes substantially rotational symmetric shell 1, and quill shaft 2 is rotatable along the axis of shell 1
Ground is installed.Quill shaft 2 has blind end, and this blind end is connected to the centrally arranged rotor of the motor 3 schematically showing, its
Middle motor 3 axially fastens in shell 1 or on shell 1, and quill shaft 2 is installed within the bearing by motor 3.Quill shaft
2 by being arranged in shell 1 at a distance of the deep groove ball bearing 4 of certain axial distance with motor 3.
Two dish type blade racks 5,6 are formed on quill shaft 2, blade rack 5,6 certain axial direction apart
Distance ground each stretch out from the cylinder portion of quill shaft 2, and therefore when quill shaft 2 is driven by motor 3 with quill shaft 2 one
Play rotation.
It is supported with 24 blades 7, these blades are spaced around quill shaft 2 with 15 degree of angle between two blade racks 5,6
Distribution, (only depicts a small amount of blade 7) as shown in Figure 2 a in fig. 2 a, and therefore forms centrifugal pump impeller.
Different from conventional centrifugal pump impeller, blade 7 is not slim vane, but when the axial direction perpendicular to quill shaft 2 is seen
On cross section wedge shaped (as shown in Figure 2 a) so that the interval between blade 7 forms elongated airflow path 8, air stream
Passage 8 radially away from quill shaft 2 straight extend, and there is identical cross section along its length, i.e. rectangular cross section, example
As seen on the right of Fig. 2 a.
Blade rack 5,6 not only has the function of supporting blade 7, also has the air stream keeping being formed between blade 7
The function that passage 8 is closed in radial directions along its length everywhere.
Blade 7 for example can be folded by sheet metal and be soldered on blade rack 5,6.Alternately, by quill shaft 2,
Axle/impeller of pump the unit of blade rack 5,6 and solid vane 7 formation can make single type, such as by light-alloy casting.
The cylinder portion of quill shaft 2 includes multiple holes 9, and the inside 10 of quill shaft 2 is connected to annular chamber 11, annular chamber 11 by hole 9
Remain unimpeded between blade rack 5,6 below blade 7, annular chamber 11 is narrower in radial directions, hole 9 is adjacent to air circulation
The radial inner end in road 8.
Quill shaft 2 has opening, and fixing inlet connecting 12 extend in this opening.Inlet connecting 12 is therefrom
The opening of empty axle 2 extends to outside through shell 1.The inside 10 of quill shaft 2, is connected with entrance by being arranged in quill shaft 2
Ring packing filler 13 between part 12 is sealed in the way of airtight with respect to the remainder of shell 1.
The annular lip seal 14 being arranged in deep groove ball bearing 4 side provides additional seal, lip for the inside 10 of quill shaft 2
The sealing lip of sealing member 14 leans against in the cylinder portion of quill shaft 2, and the periphery of lip seal 14 securely and is sealingly located at
In shell 1.
8 sheet metal air guide element 15 are around between all portions of centrifugal pump impeller being formed by blade rack 5,6 and blade 7 etc.
Away from ground distribution.Each sheet metal air guide element 15 is anchored on shell 1, and the axis ratio of elongation pump along shell 1 in outside
The big segment distance of the axial length of impeller.
There is little gap between impeller of pump and sheet metal air guide element 15, and the axle of the axial end in impeller of pump
Laterally, sheet metal air guide element 15 extends one section of short distance along the axis direction of shell 1, if it is seen from figure 1 that.
In the region of two axial ends of sheet metal air guide element 15, shell 1 opens wide to environment, forms ring-shaped air outlet 16 He
17.Ring-shaped air outlet 16 can also be substituted by simple cylinder open.
Equally, in the case of the abundant axial ventilation of impeller of pump, shell can only be divulged information in side.Sheet metal is empty
Gas guiding piece 15 can be arranged on the cylinder shape inner wall of shell 1 so that by impeller of pump with respect to longitudinal axis with spiral structure
The air of conveying can preferably be discharged into sidepiece.In this case, the orientation of corresponding helical angle depends on centrifugal pump leaf
The direction of rotation of wheel.
Fig. 2 b shows the embodiment in both sides axial ventilation for the impeller of pump (5,6,7), such as in FIG by ring-shaped air outlet
Represented by 16 and 17.In this case, sheet metal air guide element 15 is symmetrical with respect to the central plane of centrifugal pump impeller
Ground arrangement.
If shell only has air outlet slit in side, then impeller of pump is in side axial ventilation.Sheet metal air draws
Then guiding element aligns along its whole length towards ventilation side, as shown in Figure 2 c.
If motor 3, axle 2, therefore also have centrifugal pump impeller (its by blade rack 5,6 and blade 7 formed and and hollow
Axle 2 forms unit) direction of arrow rotation that marks along along Fig. 2 a, then the stream that continuous air stream is schematically drawn along along Fig. 1 and 2
Dynamic arrow builds up.
Specifically, air (for example, treating the air extracting from vacuum brake assistor) flows into axle 2 via inlet connecting 12
Inside 10, and at this through hole 9 flow into airflow path 8, in this place be accelerated and thus be discharged to outside.In air
After leaving airflow path 8, it is deflected along two axial directions against the inner side of shell 1, and along sheet metal air
Guiding piece 15 flows, and passes through ring-shaped air outlet 16 and 17 to flow out shell 1 (see Fig. 2 b).
However, in the case of having sufficient ventilation, the air radially away from centrifugal impeller can also be only one
Individual axial direction upper deflecting is simultaneously divulged information by the air outlet slit 16,17 on the side of shell.Then, in only one axial direction
On be deflected through only towards ventilation side positioning sheet metal guiding piece 15 realize (see Fig. 2 c).
The air discharged from centrifugal pump impeller, produces subsequent air flow by quill shaft 2 and inlet connecting 12.
The exit of of the bottom positioned at Fig. 2 a in airflow path 8, due to centrifugal force radially
The flowing velocity of the air leaving is represented by arrow 18.Coriolis force (the Coriolis occurring during due to centrifugal action
The flowing velocity of the air force) and with all portions of impeller of pump tangentially leaving airflow path 8 is represented by arrow 19.Two
The vector superposition of flowing velocity 18 and 19 produces the absolute outflow direction of the inclination being represented by arrow 20.
In fig. 2 a it can be seen that sheet metal air guide element 15 be approximately parallel to flow out direction 20 extend, thus, air
Outflow be homogenised and improve.Flow out the main inlet radius by centrifugal pump impeller in direction 20 and exit radius determine, and energy
Enough to be determined by calculating.Sheet metal air guide element can additionally obliquely arrange with respect to shell periphery so that by from
The air of heart pump impeller conveying can preferably be discharged to sidepiece.The orientation being in tilted layout of sheet metal air guide element is by the side of rotation
To determination.
The flow arrow of the bottom in Fig. 2 a represents that absolute air flows, that is, the flowing related to shell 1, and Fig. 2 a
The flow arrow on the right show that relative atmospheric flows, that is, the flowing related to the impeller of pump rotating in the direction of the arrow.Energy
Enough see, the front with respect to impeller of pump direction of rotation of blade 7 rotates with respect to impeller of pump than blade 7 in radial directions
The fact that back side in direction is short, contributes to air and flows out from airflow path 8.Because cross section is the back of the body of the blade 7 of wedge shape
One section of short distance is stretched out in the remaining periphery that face exceeds impeller of pump, so each blade is formed making to leave previous airflow path 8
Air deflection leave the flow spoiler 21 of impeller of pump, so that the air from next airflow path 8 also can be without hindrance
Leave.
Described centrifugal vacuum pump shows the friction loss significantly lower than vane pump or diaphragm pistonpump.Except zanjon
Outside loss at ball bearing 4, airtight and watertight padding 13 and lip seal 14, there is not friction loss.Do not appear in blade and leaf
The big friction loss occurring between the case of piece pump.Due to the centrifugal pump impeller 5,6,7 of closing, there is not gap loss.Special
Another characteristic is, directly reaches the centrifugal pump impeller 5,6,7 of closing via the entrance stream of quill shaft 2, and from entrance to going out
Mouth is continuously away from environmental sealing.Vacuum pump is robust, and does not have run time limit due to overheated danger
System.
The design principle of vacuum pump is simple and cost-effective.Therefore, when for supplying negative pressure in the motor vehicle,
Compared with commonly used vane pump and diaphragm pistonpump, cost is significantly low, and is for example allowed for brushless motor 3
Additional expenditure, whereby, service life is also unrestricted, as the situation of vane pump or diaphragm pistonpump.
The pumping power of the centrifugal vacuum pump having been described above can be increased by additional axial turbine impeller, such as schemes
3 are schematically shown.Similar to the exemplary embodiment of Fig. 1 and Fig. 2, quill shaft 32 is arranged in shell 31, is driven by motor 33
Dynamic, and form unit with centrifugal pump impeller 34.(this centrifugal pump on centrifugal pump impeller 34 side contrary with motor 33
Impeller 34 is radial turbine impeller), quill shaft 32 supports axial turbine wheel 35, and turbine wheel 35 aspirates by centrifugal pump
The air of impeller 34 pumping is simultaneously transported to outside shell 31, as illustrated by the flow arrows.
Fig. 4 shows another embodiment of integrated radial/axial turbine wheel 36.The central axial axis 10 of hollow
It is connected to the feature inner chamber of integrated radial/axial turbine wheel 36.Air is via hollow axial axis 10 by turbine leaf
Wheel 36 extraction.
Fig. 5 shows the alternative designs of the centrifugal pump according to the present invention.In this case, air passes through integrated footpath
Deflected in the way of promoting flowing to/axial turbine impeller 36.Here, the sheet metal guiding piece 15 of complicated and high cost is not
It is necessary.Lip seal 14 for the redundant seal of quill shaft is also dispensed with.Axial air on both sides exports by side
On air outlet slit substitute.Eliminate complicated and high cost right-hand side air outlet slit 17.Ring-shaped air outlet 16 is by simple
Cylindrical air exports 16a to substitute.
Claims (12)
1. a kind of centrifugal vacuum pump, including shell (1) and centrifugal pump impeller (5,6,7), described centrifugal pump impeller (5,6,7) is passed through
Axle (2) is rotatably installed in described inside the shell and has multiple airflow paths (8) being about radially arranged, described air
Circulation road (8) is fluidly connected to the aspiration (12) extending in described shell in its radial inner end, and at it radially
Outer end is fluidly connected at least one air outlet slit (16,17) stretching out described shell,
Wherein, described axle is quill shaft (2), and multiple holes (9) are formed in the cylinder of described quill shaft (2), described quill shaft
Internal (10) are fluidly connected to described airflow path (8) via the plurality of hole (9), and wherein said aspiration
(12) fluidly it is connected to the inside of described quill shaft,
Wherein, the front of the direction of rotation with respect to described centrifugal pump impeller of blade of described centrifugal pump impeller (7) is than described
The back side of the direction of rotation with respect to described centrifugal pump impeller for the described blade of centrifugal pump impeller (7) is short.
2. centrifugal vacuum pump according to claim 1, wherein：
Described vacuum pump is used as the negative pressure source of the brake booster in motor vehicles.
3. centrifugal vacuum pump according to claim 1 and 2, wherein：
The motor (3) being mechanically connected with described quill shaft (2) or the explosive motor actuator as described centrifugal vacuum pump.
4. centrifugal vacuum pump according to claim 1, wherein：
The described airflow path (8) of described centrifugal pump impeller is closed along its length everywhere.
5. centrifugal vacuum pump according to claim 1, wherein：
The described airflow path (8) of described centrifugal pump impeller substantially linearly leaves described quill shaft (2) and radially extends.
6. centrifugal vacuum pump according to claim 1, wherein：
The described airflow path (8) of described centrifugal pump impeller has essentially identical cross section along its length.
7. centrifugal vacuum pump according to claim 6, wherein：
The described airflow path (8) of described centrifugal pump impeller has generally rectangular cross section along its length, and is arranged on
The having between the blade of wedge-shaped cross-section of described centrifugal pump impeller.
8. centrifugal vacuum pump according to claim 1, wherein：
It is furnished with the sheet metal air guide element (15) of multiple fixations, described sheet metal air around the circumferential portion of described centrifugal pump impeller
Guiding piece (15) is approximately parallel to the flow direction arrangement that air leaves described airflow path (8).
9. centrifugal vacuum pump according to claim 8, wherein：
Described sheet metal air guide element (15) is additionally inclined and positioned in all portions of described shell.
10. centrifugal vacuum pump according to claim 1, wherein：
Described quill shaft (32) additionally supports axial turbine wheel (35), and described axial turbine impeller (35) is suitable to aspirate
Leave the air of described centrifugal pump impeller (34) and be transported to described shell (31) outward.
11. centrifugal vacuum pumps according to any one of claim 1,2,4 to 7, wherein：
Described quill shaft is additionally attached to turbine wheel, and described turbine wheel is integrated radial/axial turbine leaf
The form of wheel (36).
A kind of 12. methods that negative pressure is produced by impeller of pump (5,6,7),
Described impeller of pump (5,6,7) is rotatably installed in shell (1) by axle (2) and has and multiple is about radially arranged
Airflow path (8), air is radially therefrom the inner by centrifugal force by described airflow path (8), and to be transported to its footpath outside
End,
Wherein it is allowed to multiple holes (9) that air to be pumped axial cavity (10) from described axle (2) passes through in described axle flow into
Described airflow path (8),
Wherein, the front of the direction of rotation with respect to described impeller of pump of blade of described impeller of pump (7) is than described impeller of pump (7)
The direction of rotation with respect to described impeller of pump for the described blade the back side short.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102011003509.5 | 2011-02-02 | ||
| DE102011003509.5A DE102011003509B4 (en) | 2011-02-02 | 2011-02-02 | Centrifugal vacuum pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102628446A CN102628446A (en) | 2012-08-08 |
| CN102628446B true CN102628446B (en) | 2017-03-01 |
Family
ID=46511270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210022549.1A Active CN102628446B (en) | 2011-02-02 | 2012-02-01 | Centrifugal vacuum pump and the method for producing negative pressure |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102628446B (en) |
| DE (1) | DE102011003509B4 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108397389A (en) * | 2018-03-15 | 2018-08-14 | 潘晓江 | A kind of vacuum pump and its multistage vacuum pump |
| CN108547672A (en) * | 2018-07-02 | 2018-09-18 | 西安空天能源动力智能制造研究院有限公司 | A kind of micro turbine engine bearing cooler |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143719A (en) * | 1996-07-17 | 1997-02-26 | 于进才 | Method for pumping high-vacuum degree |
| DE19725335A1 (en) * | 1997-06-16 | 1998-12-17 | Bayerische Motoren Werke Ag | Drive disc with integrated radial fan |
| CN1266149A (en) * | 1999-03-04 | 2000-09-13 | 崔铁汉 | super critical vacuum pump |
| DE19953270A1 (en) * | 1999-11-06 | 2001-05-10 | Michael Johannes Jensen | Centrifugal force compressor used as turbocompressor which has higher efficiency than conventional turbo compressors |
-
2011
- 2011-02-02 DE DE102011003509.5A patent/DE102011003509B4/en active Active
-
2012
- 2012-02-01 CN CN201210022549.1A patent/CN102628446B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143719A (en) * | 1996-07-17 | 1997-02-26 | 于进才 | Method for pumping high-vacuum degree |
| DE19725335A1 (en) * | 1997-06-16 | 1998-12-17 | Bayerische Motoren Werke Ag | Drive disc with integrated radial fan |
| CN1266149A (en) * | 1999-03-04 | 2000-09-13 | 崔铁汉 | super critical vacuum pump |
| DE19953270A1 (en) * | 1999-11-06 | 2001-05-10 | Michael Johannes Jensen | Centrifugal force compressor used as turbocompressor which has higher efficiency than conventional turbo compressors |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102011003509A1 (en) | 2012-08-02 |
| DE102011003509B4 (en) | 2021-09-23 |
| CN102628446A (en) | 2012-08-08 |
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