CN107559238B - A kind of import guiding device improving canned motor pump cavitation performance - Google Patents
A kind of import guiding device improving canned motor pump cavitation performance Download PDFInfo
- Publication number
- CN107559238B CN107559238B CN201710666215.0A CN201710666215A CN107559238B CN 107559238 B CN107559238 B CN 107559238B CN 201710666215 A CN201710666215 A CN 201710666215A CN 107559238 B CN107559238 B CN 107559238B
- Authority
- CN
- China
- Prior art keywords
- impeller
- pump
- diversion pipe
- nut
- canned motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The present invention relates to a kind of import guiding devices for improving canned motor pump cavitation performance, belong to field of fluid machinery.Under the premise of not changing other main components in pump, it only replaces impeller nut (4), install fixed guide vane (2), diversion pipe (3) additional, interior circulating cooling liquid is drained to far from suction eye (51) remotely, it changes high speed and goes out direct impact of the stream to suction eye (51) low-pressure area, effectively improve inflow condition, the cavitation performance of canned motor pump is improved, it is simple, convenient, efficient, at low cost, and universality is strong.
Description
Technical field
The present invention relates to a kind of import guiding devices for improving canned motor pump cavitation performance, belong to field of fluid machinery.
Background technique
Canned motor pump is a kind of centrifugal pump of No leakage.In various fields such as aerospace, petrochemical industry, medicine foods because of it
Have the characteristics that No leakage, compact-sized, good reliability are used widely.Interior circulating cooling is that shielding pump motor, bearing are cold
But one of major way lubricated.The heat that motor internal generates when working must be taken away by circulating cooling liquid.Meanwhile it supporting to turn
The radial guide bearing and limitation axial float of son, the thrust bearing for bearing axial force also need to be in necessary circulation cooling circuits
It can work normally.Therefore circulation cooling circuit is the necessary condition for guaranteeing canned motor pump and working normally.
Interior circulating cooling realizes that coolant liquid is the operation medium in pumping by canned motor pump itself.Regular circulation circuit is cold
But the flow-out hole of liquid is located at impeller nut head, and the coolant liquid of high speed outflow forms jet impulse impeller inlet low-pressure area, seriously
The uniformity for affecting impeller inflow velocity, causes impeller inlet easily to generate cavitation phenomenons.Cavitation makes the lift decline of pump, effect
Rate reduces, and vibration and noise significantly improves, and has serious harm to the safe and stable operation of pump and whole system.
The research for improving canned motor pump cavitation performance at present is concentrated mainly on Optimum Hydraulic Design, changes loop structure, pumping
Import increases inducer etc..Wang Daren (" cavitation and structure of canned motor pump design ") has studied loop structure to pump cavitation
It influences, proposes reverse circulation structure, circulation fluid is introduced from motor front, successively passes through fore bearing, housing gap, rear axle
Hold equal components；Qu Ping (" canned motor pump suitable for low device net positive suction head ") etc. has studied the canned motor pump of low device net positive suction head,
The pressure vessel that the impeller wheel portion of canned motor pump is placed in and is sunken to underground is proposed, pump lift is artificially increased, to reduce pump
Net positive suction head；Won flat (" inducer of the high anti-cavitation of varying pitch taper for canned motor pump ") etc., which proposes to install additional in pump inlet, to be become
The inducer of screw pitch taper makes the flow velocity of liquid gradually by increasing area of passage in the case where working fluid flow is constant
It reduces, the process for being pressurized liquid is more reasonable.From the foregoing, it will be observed that improve canned motor pump cavitation performance on currently used method and
Means, higher cost, universality be not strong.Innovation structure proposed in this paper do not change pump in other main components under the premise of,
Install import guiding device additional, universality is strong, is simple and efficient, and has practical significance.
Summary of the invention
In order to improve the cavitation performance of pump, the present invention is based on circulation cooling circuit systems in conventional canned motor pump, propose pump
Change the outfit impeller nut and the coefficient import guiding device of baffle in suction chamber, wherein impeller nut inner perforated；Water conservancy diversion
Body is newly-increased component, includes diversion pipe and fixed guide vane.
Impeller nut is made of stud and nut two parts, and inner perforated aperture is identical as the hollow shaft internal orifice dimension of motor,
Nut outer profile is stream interface, smooth excessively with back shroud of impeller stream interface after installation；Diversion pipe is hollow cylinder, internal orifice dimension D and sky
Mandrel internal orifice dimension is identical, and water conservancy diversion pipe range L is fixed according to pump suction chamber depth, its outlet port is made to extend to pump inlet, diversion pipe as far as possible
Leading edge, trailing edge both ends use airflow design；Fixed guide vane section is plate or air foil shape, and the number of blade 2~4, guide vane is wide
Spend 0.2~0.5 times that N is pump inlet diameter H.
The stud of impeller nut and the hollow shaft thread connection of motor, stud thread rotary orientation and hollow shaft direction of rotation phase
Instead, with the fixed impeller of locking mode；Fixed guide vane, diversion pipe and the pump housing cast completion or later period by welding manner simultaneously and pump
The connection of body suction chamber；Gap M between impeller nut outlet and diversion pipe trailing edge is fixed according to rotor axial play maximum magnitude,
Guarantee that gap M is 5%~10%D after installation；Fixed guide vane and pump housing coupled position are as close to impeller, so that diversion pipe
Outlet is located at fixed guide vane upstream.
The invention has the advantages that the present invention under the premise of not changing other main components in pump, only replaces impeller nut, installs additional
Interior circulating cooling liquid is drained to far from suction eye remotely by fixed guide vane, diversion pipe, is changed high speed and is gone out stream to impeller
The direct impact of suction inlet low-pressure area, effectively improves inflow condition, improves the cavitation performance of canned motor pump, simply, conveniently, it is high
It imitates, is at low cost, and universality is strong.
Detailed description of the invention
The present invention will be further explained below with reference to the attached drawings
Fig. 1 is shield pump structure figure of the present invention.
Fig. 2 is that impeller nut of the present invention and baffle are installed on the location drawing in canned motor pump.
Fig. 3 is impeller nut of the present invention and baffle relative position figure.
Fig. 4 is impeller nut structure chart of the present invention.
Fig. 5 is two vane type baffle structure charts of the invention.
Fig. 6 is three-vane baffle structure chart of the present invention.
Pump suction chamber 1；Pump inlet 11；Fixed guide vane 2；Fixed guide vane and pump housing coupled position；Diversion pipe 3；Diversion pipe goes out
Mouth 31；Diversion pipe leading edge 32；Diversion pipe trailing edge 33；Impeller nut 4；Stud 41；Nut 42；Impeller nut outlet 43；Impeller 5；
Suction eye 51；Hollow shaft 6；Motor 7.
Specific embodiment
As shown in Figure 1, under the premise of not changing other main components of canned motor pump, only replace impeller nut (4), install additional by
The baffle that diversion pipe 3, fixed guide vane 2 form, impeller nut 4 and baffle collective effect, improve canned motor pump cavitation performance.It is interior
Circulating cooling liquid flows into diversion pipe 3 via the hollow stud 41 and hollow nut 42 of hollow impeller nut 4, is drained to far from leaf
It takes turns suction inlet 51 remotely, crosses with import mainstream, avoid the jet stream being cooled into the straight of 51 low-pressure area of suction eye
Connect impact.Fixed guide vane 2 again rectifies coolant liquid and mainstream, it is therefore prevented that prewhirls；Nut of the entrance fluid through impeller nut 4
42 stream interfaces are by axially smoothly turning to radial inflow impeller 5, and diversion pipe leading edge 32,33 both ends airflow design of trailing edge, reduce in addition
Disturbance to inlet flow, is remarkably improved the uniformity of 5 inlet flow of impeller, is effectively improved 5 inflow condition of impeller, thus
It realizes the purpose that pump cavitation performance is substantially improved, while improving the hydraulic efficiency of pump.In experiment, not using present invention design
When, it is necessary to net positive suction head NPSHr is 2.5m, and after applying the present invention, NPSHr 1.15m, hydraulic efficiency improves 2%.
Claims (6)
1. a kind of import guiding device for improving canned motor pump cavitation performance, including the impeller nut (4) in canned motor pump, and by leading
The baffle of flow tube (3), fixed guide vane (2) composition, it is characterised in that: impeller nut (4) and baffle are installed on pump jointly and inhale
It enters the room in (1), impeller nut (4) is made of stud (41) and nut (42) two parts, impeller nut (4) inner perforated, nut
(42) outer profile is stream interface, smooth excessively with impeller (5) back shroud stream interface after installation；Diversion pipe (3) is installed on impeller nut (4)
Front end, diversion pipe (3) are hollow cylinder, and diversion pipe leading edge (32), trailing edge (33) both ends use airflow design；Fixed guide vane
(2) it is mounted on diversion pipe (3)；The stud (41) of impeller nut (4) and hollow shaft (6) thread connection of motor (7), stud
(41) thread rotary orientation and hollow shaft (6) direction of rotation are on the contrary, fixed impeller (5) with locking mode；Fixed guide vane (2), diversion pipe
(3) it casts completion simultaneously with the pump housing or the later period passes through welding manner and couples with pump housing suction chamber (1).
2. a kind of import guiding device for improving canned motor pump cavitation performance as described in claim 1, it is characterised in that: impeller spiral shell
Female inner perforated aperture is identical as hollow shaft (6) internal orifice dimension of motor (7).
3. a kind of import guiding device for improving canned motor pump cavitation performance as described in claim 1, it is characterised in that: diversion pipe
(3) internal orifice dimension D is identical as hollow shaft (6) internal orifice dimension, and diversion pipe (3) long L is fixed according to pump suction chamber (1) depth, should make its outlet
(31) position extends to pump inlet (11) as far as possible.
4. a kind of import guiding device for improving canned motor pump cavitation performance as described in claim 1, it is characterised in that: fixation is led
Leaf (2) section is plate or air foil shape, and the number of blade 2 ~ 4, guide vane width N is 0.2 ~ 0.5 times of pump inlet (11) diameter H；
Fixed guide vane and pump housing coupled position (21) are as close to impeller (5), so that draft tube outlets (31) are located at fixed guide vane
(2) upstream.
5. a kind of import guiding device for improving canned motor pump cavitation performance as described in claim 1, it is characterised in that: impeller spiral shell
Gap M between mother outlet (43) and diversion pipe trailing edge (33) is fixed according to rotor axial play maximum magnitude, guarantees after installation
Gap M is 5% ~ 10%D, and D is diversion pipe (3) internal orifice dimension.
6. a kind of import guiding device for improving canned motor pump cavitation performance as described in claim 1, it is characterised in that: interior circulation
Coolant liquid flows into diversion pipe via the hollow stud of hollow impeller nut and hollow nut, be drained to far from suction eye compared with
At a distance, it crosses with import mainstream, avoids direct impact of the jet stream being cooled into suction eye low-pressure area；Fixed guide vane
Coolant liquid and mainstream are rectified again, it is therefore prevented that prewhirl；Nut stream interface of the entrance fluid through impeller nut is steadily turned by axial
To radial inflow impeller, diversion pipe leading edge, the airflow design of trailing edge both ends, reduce the disturbance to inlet flow in addition, can show
The uniformity for improving impeller inlet flowing is write, impeller inflow condition is effectively improved, pump cavitation performance is substantially improved to realize
Purpose, while improving the hydraulic efficiency of pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710666215.0A CN107559238B (en) | 2017-08-07 | 2017-08-07 | A kind of import guiding device improving canned motor pump cavitation performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710666215.0A CN107559238B (en) | 2017-08-07 | 2017-08-07 | A kind of import guiding device improving canned motor pump cavitation performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107559238A CN107559238A (en) | 2018-01-09 |
| CN107559238B true CN107559238B (en) | 2019-08-27 |
Family
ID=60974026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710666215.0A Active CN107559238B (en) | 2017-08-07 | 2017-08-07 | A kind of import guiding device improving canned motor pump cavitation performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107559238B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108386365A (en) * | 2018-02-08 | 2018-08-10 | 江苏大学镇江流体工程装备技术研究院 | A kind of compact segment nest shell integral type high speed canned motor pump |
| CN108730195A (en) * | 2018-06-07 | 2018-11-02 | 浙江华泰电子有限公司 | Wind-force generating converter Special punching welds multi-stage shield pump |
| CN109488640B (en) * | 2018-12-18 | 2023-12-26 | 南京磁谷科技股份有限公司 | Cooling air outlet structure of rotor in magnetic suspension blower |
| CN110630529B (en) * | 2019-08-12 | 2020-09-25 | 江苏大学 | Inlet pre-rotation adjusting device based on mixed flow pump flow tracking and adjusting method thereof |
| CN110701110A (en) * | 2019-10-30 | 2020-01-17 | 江苏大学 | Volute type centrifugal pump with movable guide vanes |
| CN114893445B (en) * | 2022-05-19 | 2024-04-02 | 浙江理工大学 | Static guide vane mechanism in high-speed centrifugal pump |
| CN114876815A (en) * | 2022-06-15 | 2022-08-09 | 浙江豪贝泵业股份有限公司 | Shielding pump |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2799930Y (en) * | 2004-01-18 | 2006-07-26 | 王加华 | Full-closed rotary internal cooling system for externally equipped mechanical seal |
| CN202152756U (en) * | 2011-07-27 | 2012-02-29 | 上海东方泵业(集团)有限公司 | Reverse circulation type shielding chemical pump with internal circulation structure |
| CN202597217U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Inducer for containment spray pump |
| WO2016000846A1 (en) * | 2014-07-02 | 2016-01-07 | Pierburg Gmbh | Electrical compressor for an internal combustion engine |
| CN106122042A (en) * | 2016-08-16 | 2016-11-16 | 广州市白云泵业集团有限公司 | A kind of many suction nozzles proof submersible sand discharging pump |
-
2017
- 2017-08-07 CN CN201710666215.0A patent/CN107559238B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2799930Y (en) * | 2004-01-18 | 2006-07-26 | 王加华 | Full-closed rotary internal cooling system for externally equipped mechanical seal |
| CN202152756U (en) * | 2011-07-27 | 2012-02-29 | 上海东方泵业(集团)有限公司 | Reverse circulation type shielding chemical pump with internal circulation structure |
| CN202597217U (en) * | 2012-03-27 | 2012-12-12 | 上海阿波罗机械股份有限公司 | Inducer for containment spray pump |
| WO2016000846A1 (en) * | 2014-07-02 | 2016-01-07 | Pierburg Gmbh | Electrical compressor for an internal combustion engine |
| CN106122042A (en) * | 2016-08-16 | 2016-11-16 | 广州市白云泵业集团有限公司 | A kind of many suction nozzles proof submersible sand discharging pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107559238A (en) | 2018-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107559238B (en) | A kind of import guiding device improving canned motor pump cavitation performance | |
| CN100338366C (en) | Inducer, and inducer-equipped pump | |
| CN103477086B (en) | Pump-unit and pumping system | |
| CN110238708B (en) | Magnetorheological fluid circulating system of magnetorheological polishing machine tool | |
| US3168048A (en) | Full range operable high specific speed pumps | |
| CN109915418A (en) | A kind of blade extension type vertical centrifugal pump airflow fence and the centrifugal pump using the airflow fence | |
| SE509406C2 (en) | Method and apparatus for circulation pumps | |
| US6390783B1 (en) | Hydraulic pump having low aeration single return boost reservoir | |
| CN209925077U (en) | Cooling water pump for self-cooling engine | |
| CN103206383A (en) | Vapor-core pump with impeller central pressure supplement regulator | |
| Zhenjun et al. | The study on internal flow characteristics of magnetic drive pump | |
| CN103452910A (en) | Staggered centrifugal pump spatial guide vane | |
| CN105422512A (en) | Lateral type spiral delivery chamber of centrifugal pump | |
| RU2305191C2 (en) | Rotary hydraulic machine | |
| Li et al. | PIV measurement of internal flow in mixed-flow pump under different flow rate conditions | |
| CN107719611B (en) | A kind of hydraulic propeller with water flow distributor gear | |
| CN200989330Y (en) | Segmental symmetrical scroll guide ring multistage centrigfugal pump | |
| CN103850947A (en) | Anti-cavitation vane pump | |
| CN106499669B (en) | Using the water pump of flexible guide vane | |
| CN213808193U (en) | Axial flow pump impeller | |
| CN216044647U (en) | Vertical pipeline pump for reducing hydraulic loss | |
| CN220286031U (en) | Novel high anti-cavitation inducer | |
| CN219774436U (en) | Split vertical single-stage pump | |
| CN220337140U (en) | Centrifugal water pump capable of reducing cavitation and improving hydraulic efficiency | |
| CN116857222B (en) | Impeller, pump head and impeller design method for magnetic suspension pump |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |