CN107859628A - A kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming - Google Patents
A kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming Download PDFInfo
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- CN107859628A CN107859628A CN201711258777.8A CN201711258777A CN107859628A CN 107859628 A CN107859628 A CN 107859628A CN 201711258777 A CN201711258777 A CN 201711258777A CN 107859628 A CN107859628 A CN 107859628A
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- Prior art keywords
- pump
- centrifugal
- multistage
- priming
- centrifugal 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
- F04D9/00—Priming; Preventing vapour lock
- F04D9/02—Self-priming 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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage 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
- F04D29/007—Details, component parts, or accessories 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 invention provides a kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming, belong to fluid machinery technical field.It solves the problems such as existing centrifugal pump stability is poor, speed is slow.The centrifugal multistage pump multiple centrifugal pump of this acceleration self-priming, including motor and pump case, multistage centrifugal pump intake and multistage centrifugal pump discharge are provided with pump case, and there is connection entrance and the pump case cavity of outlet inside pump case, centrifugal guide vane shell is provided with pump case cavity, centrifugal multistage pump multiple centrifugal pump inlet chamber is provided with pump case cavity, its front end is provided with water fender, its rear end has impeller eye, return port is offered between impeller eye and water fender, return port bottom is provided with non-return valve core, there is spring on non-return valve core, annular release net and annular rack are provided with centrifugal guide vane shell, separate mesh and annular rack are close together and are installed between outlet of centrifugal pump and return port, separate mesh bottom is provided with fan mouth.The present invention has the advantages that stable performance, self-priming speed are fast.
Description
Technical field
The invention belongs to fluid machinery technical field, is related to a kind of centrifugal pump, more particularly to a kind of multistage for accelerating self-priming
Centrifugal pump.
Background technology
Pump be it is a kind of have a large capacity and a wide range, the universal machine that energy expenditure is huge, it is every have liquid flow place nearly all have
Pump is working.In all pump class products, Minitype multistage centrifugal pump has that simple in construction, easy maintenance, flow be big, lift
The high, advantage such as efficiency is excellent, in city, multiple sector applications such as water delivery, industry, mining are extensive.Relative to jet pump, peripheral pump etc.
The small-sized land pump of main flow, Minitype multistage centrifugal pump, the centrifugal multistage pump multiple centrifugal pump of particularly stainless steel, because its efficiency is with obvious excellent
Gesture, anti-cavitation ability is also very strong, is relatively low plus the operating noise of centrifugal multistage pump multiple centrifugal pump in itself, if so with reference to flow mechanism
Go out a centrifugal multistage pump multiple centrifugal pump that can realize fast self-priming with Hydraulic Optimizing Design, then such novel multistage centrifugal pump will have
Huge market potential.
Some recent international pump industry giants and the small-sized self-priming stainless steel centrifugal multistage pump multiple centrifugal pump of domestic pump commercial city active development, such as
Grandfos, power heavily fortified point pump industry etc..With the self priming centrifugal pump of single-stage（Also referred to as pipeline pump）It is similar, recently by power heavily fortified point pump industry independent development
And manufacture, and the self-priming centrifugal multistage pump multiple centrifugal pump of disclosure of the invention, and by providing the inlet chamber of a gas-liquid mixed, make
Derived from pumping phases, the water of inoculated returns to inlet chamber after acceleration acquisition energy is pressurized by impeller by return port in pump chamber,
The fluctuation of gas-liquid interface is finally driven by reflux fluid and then merges the fluid that gas enters in snout cavity body, realizes that gas-liquid is mixed
Close；The gas-liquid two-phase fluid formed enters impeller under the attraction of impeller eye, stator is accelerated, is pressurized, and is finally discharged into
The pump case cavity of outlet is provided with, gas-liquid separation is realized due to the buoyancy of bubble；Water in pump case cavity is in impeller eye and pump
Between shell cavity under the driving of existing pressure difference, import cavity is poured in via return port.Terminate when from pumping phases, return port valve element
Under the hydraulic pressure effect that pump case cavity increases severely, return port is pressed against, so as to closing volume hole.
Nevertheless, this suction capacity similar to traditional self priming centrifugal pump, than relatively limited, general suction will not surpass
8m is crossed, the suction of even some producers only has 4-5m, and there is also larger defect, general self-priming 8m for the stability and speed of self-priming
Time more than 6 minutes, self-priming 7m time is also at 5 minutes or so.Therefore how the suction of Minitype multistage centrifugal pump is being ensured
The stability of journey and self-priming, realize that being substantially improved for self-priming speed is a urgent problem to be solved.
The content of the invention
The purpose of the present invention is for current self-priming centrifugal multistage pump multiple centrifugal pump self-priming speed is excessively slow, self-priming stability is poor not
A kind of foot, there is provided centrifugal multistage pump multiple centrifugal pump for accelerating self-priming.
The purpose of the present invention can be realized by following technical proposal：It is a kind of accelerate self-priming centrifugal multistage pump multiple centrifugal pump, including motor with
And the pump case being connected with motor, multistage centrifugal pump intake and multistage centrifugal pump discharge, and pump case are provided with described pump case
Inside has connection entrance and the pump case cavity of outlet, is provided with centrifugal guide vane shell in described pump case cavity, its feature exists
In being provided with the centrifugal multistage pump multiple centrifugal pump inlet chamber being connected with multistage centrifugal pump intake in described pump case cavity, described is more
The front end of level centrifugal pump inlet cavity is provided with water fender, and its rear end has the impeller eye corresponding with centrifugal guide vane shell,
Return port is offered between described impeller eye and water fender, described return port bottom is provided with non-return valve core, described
There is the spring for being resisted against return port edge on non-return valve core, be provided with described centrifugal guide vane shell for accelerating pump case
Gas-liquid separation in cavity, while strengthen the annular release net of flow uniformity in pump chamber and annular rack, described separate mesh with
Annular rack, which is close together, to be installed between outlet of centrifugal pump and return port, close to outlet of centrifugal pump, described separate mesh bottom
End is provided with fan mouth.
The technique effect of the centrifugal multistage pump multiple centrifugal pump of this acceleration self-priming is：From the gas-liquid two-phase fluid in pumping phases, inlet chamber
Pump case cavity is injected into after the supercharging, speed-raising and water conservancy diversion of multi-stage impeller and stator, due to now pre- in pump case cavity
The fluid of filling often is difficult to fill whole pump case cavity in the presence of impeller rotates at a high speed, is carried out plus to gas-liquid two-phase fluid
The effect of the afterbody impeller and stator that finally do work, the gas-liquid two-phase fluid for flowing into pump case cavity are that edge is similar to spiral track
The motion of mark flows to pump intake direction；This flow behavior directly contributes the flowing near the return port in inlet chamber bottom
It is extremely unstable, and inevitably there is bubble to enter inlet chamber with reflux fluid, so as to largely effect on centrifugal multistage pump multiple centrifugal pump certainly
The stability of suction, extends self-priming time, therefore suction can also be affected.The present invention is using annular release net effectively by pump case
Bubble in cavity concentrates barrier to substantially reduce between separate mesh and the outlet of afterbody centrifugal impeller and be back to return port stream
The void fraction of body, strengthen the momentum of reflux fluid, to accelerate the gas-liquid mixed in inlet chamber；Simultaneously to strong non-in pump case cavity
Permanent unstable flowing carries out abundant rectification, makes have energy high-velocity fluid to be flowed after annular release net in pump case cavity
Uniformity significantly increases, and fluid velocity weakens, and the kinetic energy of boost in pressure, i.e. fluid changes into pressure potential, lifts inlet chamber
Pressure difference between impeller eye, it is equally beneficial for reducing the loss of momentum of reflux fluid, accelerates the gas-liquid in inlet chamber to mix
Close, it is final to improve self-priming speed.The fan annular mouth of separate mesh bottom can be reduced further through separate mesh to be entered through return port
The flow resistance of this partial reflux fluid of inlet chamber, the fluency of enhancing backflow circulation, thus shortens self-priming time.
In a kind of centrifugal multistage pump multiple centrifugal pump of above-mentioned acceleration self-priming, the full multistage centrifugal pump of described annular release screen cloth
Annular space between shell and pump case.
In a kind of centrifugal multistage pump multiple centrifugal pump of above-mentioned acceleration self-priming, described annular release net is installed on pump discharge and backflow
It is 0.01D-3.0D apart from pump discharge between hole, D is centrifugal multistage pump multiple centrifugal pump outlet diameter.
In a kind of centrifugal multistage pump multiple centrifugal pump of above-mentioned acceleration self-priming, the single mesh minimal characteristic chi of described annular release net
Degree is less than 0.5D1, minimum ranges of the D1 between annular release net outer edge.
In a kind of centrifugal multistage pump multiple centrifugal pump of above-mentioned acceleration self-priming, described separate mesh fans annular mouth along annular release net
Central angle is 1 ° ~ 90 °, symmetrical along the vertical median plane of separate mesh.
In a kind of centrifugal multistage pump multiple centrifugal pump of above-mentioned acceleration self-priming, the hole of the annular release net is equal size, on an equal basis
Shape.
In a kind of centrifugal multistage pump multiple centrifugal pump of above-mentioned acceleration self-priming, the hole of the annular release net can be it is fan-shaped, trapezoidal,
Rectangle, circle, polygon and other shapes.
Compared with prior art, the centrifugal multistage pump multiple centrifugal pump of this acceleration self-priming has the following advantages that：
1. annular release net causes the gas-liquid two-phase fluid of pump case cavity to efficiently separate in the axial direction, the gassiness of reflux fluid is reduced
Rate, it is obviously improved the momentum and momentum stability of reflux fluid.
2. annular release net causes the flowing in pump chamber to obtain sufficient rectification, the stability of flowing before return port is entered
Greatly promote.
3. pump case cavity is separated into two parts by annular release net, the cavity close to return port side not only flows equal
Even property is improved, and can be slowed down supercharging in the fluid in the presence of separate mesh in the cavity, lifts the pressure of reflux fluid
Power so that the pressure difference between inlet chamber and impeller eye is bigger, is more beneficial for the progress of gas-liquid mixed in inlet chamber.
4. the fan annular mouth of separate mesh bottom can further reduce the flow resistance of reflux fluid, preserve reflux fluid and take
While the kinetic energy and pressure potential of band, the fluency of enhancing backflow circulation, thus shorten self-priming time.
5. annular release net and rack will not have an impact to the service behaviour of centrifugal multistage pump multiple centrifugal pump, because normal pump water conservancy project is made
When, non-return valve core will close.
6. the annular release web frame of the present invention is simple, easy for installation, difficulty of processing is small, light weight, industrialization and market
Have a extensive future.
Brief description of the drawings
Fig. 1 is the centrifugal multistage pump multiple centrifugal pump structural representation of acceleration self-priming of the present invention.
Fig. 2 is annular release net and grid structure detail view.
In figure, 1, annular rack；2nd, annular release net；3rd, separate mesh fan annular mouth；4th, non-return valve core；5th, return port；6、
Spring；7th, multistage centrifugal pump intake；8th, pump case；9th, water level baffle plate；10th, centrifugal multistage pump multiple centrifugal pump inlet chamber；11st, impeller eye；12、
Multistage centrifugal pump discharge；13rd, pump case cavity；14th, motor；15th, centrifugal guide vane shell.
Embodiment
It is the specific embodiment of the present invention and with reference to accompanying drawing below, technical scheme is further described,
But the present invention is not limited to these embodiments.
As shown in Figure 1 and Figure 2, this it is a kind of accelerate self-priming centrifugal multistage pump multiple centrifugal pump, including one be used for strengthen gas in pump case cavity
Liquid separates and the annular release net 2 of flow uniformity, supports the annular rack 1 of annular separate mesh, and separate mesh 2 is close to rack 1
It is installed on together between outlet of centrifugal pump 12 and return port 5, close to outlet of centrifugal pump 12；Separate mesh bottom is provided with fan annular mouth
3。
Acting from the gas-liquid two-phase fluid in pumping phases, inlet chamber by multi-stage impeller and stator, supercharging, speed-raising with
Freely inject into pump case cavity after water conservancy diversion, because now the fluid of inoculated often rotates at a high speed in impeller in pump case cavity 13
It is difficult to fill whole pump case cavity 13 under effect, plus the afterbody impeller finally to be done work to gas-liquid two-phase fluid and leads
The effect of leaf, the gas-liquid two-phase fluid for flowing into pump case cavity 13 are to flow to the direction of pump intake 7 along the motion for being similar to helical trajectory；
The flowing that this flow behavior is directly resulted near the return port 5 in the bottom of inlet chamber 10 is extremely unstable, and can not keep away
There is bubble to follow reflux fluid to enter inlet chamber 10 with exempting from, largely effect on the stability of centrifugal multistage pump multiple centrifugal pump self-priming, extend certainly
The time is inhaled, therefore suction can also be affected.Bubble in pump case cavity is effectively concentrated resistance by the present invention using annular release net 2
It is interposed between separate mesh 2 and the outlet of afterbody centrifugal impeller, substantially reduces the void fraction for the fluid for being back to return port, enhancing
The momentum of reflux fluid, to accelerate the gas-liquid mixed in inlet chamber, another aspect bubble is separated the effectively barrier of net 2 from pump
Outlet 12 closer to side, be more beneficial for the floating and final discharge pump case cavity 13 of bubble；Simultaneously to strong in pump case cavity 13
The flowing of unsteady and unstable carries out abundant rectification, makes have energy high-velocity fluid passing through annular release net 2 in pump case cavity 13
Flow uniformity significantly increases afterwards, and fluid velocity weakens, and the kinetic energy of boost in pressure, i.e. fluid changes into pressure potential, is lifted into
Pressure difference between oral cavity body 10 and impeller eye 11, it is equally beneficial for reducing the loss of momentum of reflux fluid, accelerates inlet chamber
Interior gas-liquid mixed, it is final to improve self-priming speed.The fan annular mouth 3 of separate mesh bottom can be reduced further through separate mesh 2
Enter the flow resistance of this partial reflux fluid of inlet chamber through return port, the fluency of enhancing backflow circulation, thus contract
Short self-priming time.Terminate when from pumping phases, the pressure in pump case cavity 13 increased dramatically so that inlet chamber 10 and pump case cavity
After pressure difference increase to a certain extent between 13, non-return valve core 4 is promoted to be adjacent to the shell of inlet chamber, final centrifugal multistage pump multiple centrifugal pump enters
Enter normal pump water working condition.
Further describe in detail, the annular that annular release net 2 is covered between multistage centrifugal pump shell 15 and pump case 8 is empty
Between.
Further describe in detail, described annular release net 2 is installed between pump discharge and return port 5, is apart from pump discharge
0.01D-3.0D, D are the diameter of multistage centrifugal pump discharge 12.
Further describe in detail, the single mesh minimal characteristic yardstick of described annular release net 2 is less than 0.5D1, and D1 is annular point
Minimum range between the outer edge of off-network 2.
Further describe in detail, it is 1 ° ~ 90 ° that described separate mesh, which fans central angle of the annular mouth 3 along annular release net 2, along separation
It is symmetrical to net vertical median plane.
Further describe in detail, the hole of the annular release net 2 is equal size, equal shape.
Further describe in detail, the hole of annular release net 2 can be fan-shaped, trapezoidal, rectangle, circle, polygon and other shapes.
Specific embodiment described herein is only to spirit explanation for example of the invention.Technology belonging to the present invention is led
The technical staff in domain can be made various modifications or supplement to described specific embodiment or be replaced using similar mode
Generation, but without departing from the spiritual of the present invention or surmount scope defined in appended claims.
Although more used herein annular rack 1, annular release net 2, separate mesh fan annular mouth 3, non-return valve core 4,
Return port 5, spring 6, multistage centrifugal pump intake 7, pump case 8, water level baffle plate 9, centrifugal multistage pump multiple centrifugal pump inlet chamber 10, impeller eye
11st, the term such as multistage centrifugal pump discharge 12, pump case cavity 13, motor 14, centrifugal guide vane shell 15, but be not precluded from using other
The possibility of term.It is used for the purpose of more easily describing and explaining the essence of the present invention using these terms；They are explained
The limitation additional into any one is all disagreed with spirit of the present invention.
Claims (6)
1. a kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming, including motor（14）And and motor（14）The pump case being connected（8）, it is described
Pump case（8）On be provided with multistage centrifugal pump intake（7）With multistage centrifugal pump discharge（12）, and pump case（8）Inside has connection
Entrance and the pump case cavity of outlet（13）, described pump case cavity（13）Inside it is provided with centrifugal guide vane shell（15）, its feature exists
In described pump case cavity（13）Inside it is provided with and multistage centrifugal pump intake（7）The centrifugal multistage pump multiple centrifugal pump inlet chamber being connected
（10）, described centrifugal multistage pump multiple centrifugal pump inlet chamber（10）Front end be provided with water fender, its rear end has and centrifugal guide vane shell
（15）Corresponding impeller eye（11）, described impeller eye（11）Return port is offered between water fender（5）, it is described
Return port（5）Bottom is provided with non-return valve core（4）, described non-return valve core（4）Above have and be resisted against return port（5）Edge
Spring（6）, described centrifugal guide vane shell（15）On be provided with for accelerating pump case cavity（13）Interior gas-liquid separation, strengthens simultaneously
The annular release net of flow uniformity in pump chamber（2）And annular rack（1）, described separate mesh and annular rack（1）It is close to
Outlet of centrifugal pump and return port are installed on together（5）Between, close to outlet of centrifugal pump, described separate mesh bottom is provided with fan mouth.
A kind of 2. centrifugal multistage pump multiple centrifugal pump for accelerating self-priming according to claim 1, it is characterised in that described annular release net
（2）It is covered with multistage centrifugal pump shell and pump case（8）Between annular space.
A kind of 3. centrifugal multistage pump multiple centrifugal pump for accelerating self-priming according to claim 1, it is characterised in that described annular release net
（2）It is installed on pump discharge and return port（5）Between, it is 0.01D-3.0D apart from pump discharge, D is multistage centrifugal pump discharge（12）Directly
Footpath.
A kind of 4. centrifugal multistage pump multiple centrifugal pump for accelerating self-priming according to claim 1, it is characterised in that described annular release net
（2）Single mesh minimal characteristic yardstick is less than 0.5D1, and D1 is annular release net（2）Minimum range between outer edge.
A kind of 5. centrifugal multistage pump multiple centrifugal pump for accelerating self-priming according to claim 1, it is characterised in that described separate mesh fan ring
Shape mouth（3）Along annular release net（2）Central angle be 1 ° ~ 90 °, it is symmetrical along the vertical median plane of separate mesh.
A kind of 6. centrifugal multistage pump multiple centrifugal pump for accelerating self-priming according to claim 1, it is characterised in that the annular release net
（2）Hole for equal size, equal shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711258777.8A CN107859628A (en) | 2017-12-04 | 2017-12-04 | A kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711258777.8A CN107859628A (en) | 2017-12-04 | 2017-12-04 | A kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107859628A true CN107859628A (en) | 2018-03-30 |
Family
ID=61704940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711258777.8A Withdrawn CN107859628A (en) | 2017-12-04 | 2017-12-04 | A kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming |
Country Status (1)
| Country | Link |
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| CN (1) | CN107859628A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661919A (en) * | 2018-06-26 | 2018-10-16 | 中国计量大学 | Jet pump with gas-liquid separation device |
| CN109490177A (en) * | 2018-12-17 | 2019-03-19 | 中国计量大学 | Separate silk screen bubble filtering feature measurement method |
| CN110025987A (en) * | 2019-03-26 | 2019-07-19 | 中国计量大学 | Enhance the gas-liquid separation device of self-priming centrifugal multistage pump multiple centrifugal pump self-priming |
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| CN2744859Y (en) * | 2004-11-01 | 2005-12-07 | 义乌市第二石油化工泵厂 | Guide vane type multistage self-suction centrifugal pump with strong gas-liquid separation function |
| CN104968944A (en) * | 2013-02-22 | 2015-10-07 | 三菱重工业株式会社 | Centrifugal compressor |
| US20160084253A1 (en) * | 2013-05-22 | 2016-03-24 | Grundfos Holding A/S | Multi-stage, self-priming centrifugal pump assembly |
| CN105952661A (en) * | 2016-06-15 | 2016-09-21 | 浙江工业大学 | Visual experiment device for centrifugal pump impeller |
| CN206000742U (en) * | 2016-08-24 | 2017-03-08 | 利欧集团浙江泵业有限公司 | The centrifugal multistage pump multiple centrifugal pump of low discharge state operation |
| CN207539041U (en) * | 2017-12-04 | 2018-06-26 | 力坚泵业浙江有限公司 | A kind of centrifugal multistage pump multiple centrifugal pump for accelerating self-priming |
-
2017
- 2017-12-04 CN CN201711258777.8A patent/CN107859628A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2744859Y (en) * | 2004-11-01 | 2005-12-07 | 义乌市第二石油化工泵厂 | Guide vane type multistage self-suction centrifugal pump with strong gas-liquid separation function |
| CN104968944A (en) * | 2013-02-22 | 2015-10-07 | 三菱重工业株式会社 | Centrifugal compressor |
| US20160084253A1 (en) * | 2013-05-22 | 2016-03-24 | Grundfos Holding A/S | Multi-stage, self-priming centrifugal pump assembly |
| CN105952661A (en) * | 2016-06-15 | 2016-09-21 | 浙江工业大学 | Visual experiment device for centrifugal pump impeller |
| CN206000742U (en) * | 2016-08-24 | 2017-03-08 | 利欧集团浙江泵业有限公司 | The centrifugal multistage pump multiple centrifugal pump of low discharge state operation |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108661919A (en) * | 2018-06-26 | 2018-10-16 | 中国计量大学 | Jet pump with gas-liquid separation device |
| CN109490177A (en) * | 2018-12-17 | 2019-03-19 | 中国计量大学 | Separate silk screen bubble filtering feature measurement method |
| CN109490177B (en) * | 2018-12-17 | 2022-04-19 | 中国计量大学 | Method for measuring bubble filtration characteristics of separation screen |
| CN110025987A (en) * | 2019-03-26 | 2019-07-19 | 中国计量大学 | Enhance the gas-liquid separation device of self-priming centrifugal multistage pump multiple centrifugal pump self-priming |
| CN110025987B (en) * | 2019-03-26 | 2021-04-09 | 中国计量大学 | Self-priming gas-liquid separation device of self-priming multi-stage centrifugal pump |
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Application publication date: 20180330 |