CN104454638A - Low-NPSHR centrifugal pump - Google Patents
Low-NPSHR centrifugal pump Download PDFInfo
- Publication number
- CN104454638A CN104454638A CN201410664707.2A CN201410664707A CN104454638A CN 104454638 A CN104454638 A CN 104454638A CN 201410664707 A CN201410664707 A CN 201410664707A CN 104454638 A CN104454638 A CN 104454638A
- Authority
- CN
- China
- Prior art keywords
- pump
- impeller
- net positive
- suction head
- inducer
- 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.)
- Pending
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Classifications
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/042—Axially shiftable rotors
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/20—Mounting rotors on shafts
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
- F04D29/225—Channel wheels, e.g. one blade or one flow channel
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a low-NPSHR centrifugal pump which comprises a pump body, a pump cover, a bearing box body, a pump shaft, an impeller and an inducer wheel. The bearing box body is supported by an external suspension flange, the pump shaft penetrates through the pump cover and extends into the pump body, the pump shaft is axially sleeved with the impeller, and the pump shaft is axially sleeved with the inducer wheel. The pump body is provided with a conical water suction chamber located on the water inlet side and a volute water pumping chamber located on the water outlet side. The inducer wheel is located in the water suction chamber. The impeller is arranged in the water pumping chamber. The inductor wheel is axially locked to the front end of the pump shaft through a locking nut. The low-NPSHR centrifugal pump can effectively ensure the suction performance and the anti-cavitation performance on the high-temperature medium state.
Description
Technical field
The present invention relates to centrifugal pump, specifically relate to a kind of low net positive suction head centrifugal pump.
Background technique
Centrifugal pump is a kind of water lift facility of water supply and sewage work being widely used in hydraulic engineering, city, industrial and mining enterprise.Its concrete working principle is: the effect of the centrifugal force produced transferred by centrifugal pump at impeller high-speed rotary under, the water in impeller channel is made to be thrown toward surrounding, press-in spiral case, impeller eye forms vacuum, and the water in pond is inhaled into along suction sleeve and supplements this space under external atmospheric pressure.Then the water sucked is thrown away by impeller again and enters outlet pipe through spiral case.As can be seen here, if centrifugal pump impeller constantly rotates, then can to absorb water continuously, setting-out, water just can raise eminence or a distant place from lower continuously.
The height of Cavitation Occurred in Centrifugal Pumps surplus is the important indicator evaluating its suction performance, pump under liquid medium is in the environment of certain temperature, when the pressure acting on liquid medium surface is less than or equal to the saturation vapour pressure of this temperature, liquid is volatilization under the effect of temperature field just, present vapour-water critical (vaporization) phenomenon, have influence on the output characteristics even safety in operation of pump in various degree.Obviously under atmosphere environment, the fluid temperature (when≤100 DEG C) acting on Pump Suction Nozzle is higher, is more easily vaporized, to need to employ in liquid more multiple pressure head (potential energy) to go to stop vaporization volatilization, and it is less in order to overcome pressure liquid being inhaled loss now can to leave pumping unit for.As can be seen here, NPSH (i.e. the unvaporized condition of pump itself) is lower, and suction performance is higher, is more conducive to equipment installation conditions and operation operation; Otherwise then illustrate that centrifugal pump suction performance is poor, rigorous service condition.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of low net positive suction head centrifugal pump.
In order to achieve the above object, present invention employs following technological scheme:
A kind of low net positive suction head centrifugal pump, there is such feature, comprise: the pump housing, pump cover, the bearing housing supported by external suspension frame flange, run through pump cover and extend to pump shaft in the pump housing, be axially sleeved on impeller on pump shaft, and be axially sleeved on the inducer on pump shaft; Wherein, the pump housing has the taper suction chamber being positioned at water intake side and the volute pumping chamber being positioned at water outlet side, and inducer is positioned at suction chamber, and impeller is arranged in pumping chamber; Inducer is by the front end of locking nut axial locking at pump shaft.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: between inducer and impeller, be separated with the adjusting sleeve be sleeved on pump shaft.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: between impeller and pump shaft, adopt key transmission.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: between inducer and pump shaft, adopt key transmission.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: pump cover is embedded with quiet guide bearing in the side of pressure-bearing.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: pump shaft is set with the dynamic cover of bearing in the part corresponding with pump cover; Supported by quiet guide bearing between the dynamic cover of bearing and pump cover.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: between the water sucking mouth of impeller and the madial wall of the pump housing, be provided with seal ring.
Further, in low net positive suction head centrifugal pump provided by the invention, such feature can also be had: removably connected by fastener assembly between the pump housing and external suspension frame flange.
The good effect that the present invention has on the basis of the above is:
Low net positive suction head centrifugal pump provided by the invention, by arranging inducer to improve flow stream pressure in the front end, water sucking mouth of impeller, makes between inducer and impeller, form waterpower linkage path; Further, effectively control the distance between inducer and impeller by adjusting sleeve, thus effectively ensure that centrifugal pump has best suction performance and anti-cavitation performance under high temperature media state.
Accompanying drawing explanation
Fig. 1 is the perspective view of low net positive suction head centrifugal pump in embodiments of the invention.
Embodiment
The technological means realized to make the present invention, creation characteristic, reach object and effect is easy to understand, following examples are specifically addressed low net positive suction head centrifugal pump provided by the invention by reference to the accompanying drawings.
As shown in Figure 1, the low net positive suction head centrifugal pump that the present embodiment provides comprises: the pump housing 1, pump cover 2, pump shaft 3, impeller 4, and inducer 5.
The pump housing 1 connects with external suspension frame flange 6, external suspension frame flange 6 spring bearing casing.Further, the left end opening of the pump housing 1 is water sucking mouth 11, and the open top of the pump housing 1 is water outlet 12, and the pump housing 1 has the taper suction chamber 13 being positioned at side, water sucking mouth 11 and the volute pumping chamber 14 being positioned at water outlet 12 side.Concrete, removably connected by fastener assembly 7 between the pump housing 1 and external suspension frame flange 6, in the present embodiment, fastener assembly 7 is bolt and nut component.
Pump cover 2 covers and is embedded with quiet guide bearing 21 at the right-hand member of the pump housing 1, pump cover 2 in the side of pressure-bearing.
Pump shaft 3 runs through pump cover 2 and quiet guide bearing 21 and extends in the pump housing 1.Pump shaft 3 is set with bearing in the part corresponding with pump cover 2 and moves cover 31, and bearing moves the shaft shoulder axially locating of cover 31 by pump shaft 3.Bearing moves between cover 31 and pump cover 2 and is supported by quiet guide bearing 32.
The impeller 4 be arranged in blade wheel chamber 14 is axially sleeved on pump shaft 3, by seal ring 8 radial seal between the water sucking mouth of impeller 4 and the madial wall of the pump housing 1.
The inducer 5 being positioned at taper suction chamber 13 is axially sleeved on pump shaft 3, and, inducer 5 by locking nut 10 axial locking in the front end of pump shaft 3.Inducer 5 adopts twin-feed spiral shape blade, and in order to make centrifugal pump obtain good suction performance, twin-feed spiral shape blade is identical with the Hand of spiral of impeller 4.
In the present embodiment, between inducer 5 and impeller 4, be separated with the adjusting sleeve 9 be sleeved on pump shaft 3, the suitable distance between inducer 5 and impeller 4 can be controlled by adjusting sleeve 9, to improve the suction performance of centrifugal pump to the optimum state.
Pump shaft 3 is driven by external motor and rotates, and all adopts key transmission between impeller 4 and pump shaft 3, between inducer 5 and pump shaft 3.
The low net positive suction head centrifugal pump that the present embodiment provides, by arranging inducer to improve flow stream pressure in the front end, water sucking mouth of impeller, makes between inducer and impeller, form waterpower linkage path; Further, effectively control the distance between inducer and impeller by adjusting sleeve, thus effectively ensure suction performance and the anti-cavitation performance of centrifugal pump the best under high temperature media state.
Certainly low net positive suction head centrifugal pump involved in the present invention is not merely defined in the structure in the present embodiment, any equivalent modifications of carrying out the present invention and substituting also all in category of the present invention.
Claims (8)
1. one kind low net positive suction head centrifugal pump, comprise: the pump housing, pump cover, the bearing housing supported by external suspension frame flange, run through described pump cover and the pump shaft extended in the described pump housing and the impeller be axially sleeved on described pump shaft, it is characterized in that, also comprise: be axially sleeved on the inducer on described pump shaft;
Wherein, the described pump housing has the taper suction chamber being positioned at water intake side and the volute pumping chamber being positioned at water outlet side, and described inducer is positioned at described suction chamber, and described impeller is arranged in described pumping chamber;
Described inducer is by the front end of locking nut axial locking at described pump shaft.
2. low net positive suction head centrifugal pump according to claim 1, is characterized in that:
The adjusting sleeve be sleeved on described pump shaft is separated with between described inducer and described impeller.
3. low net positive suction head centrifugal pump according to claim 1, is characterized in that:
Key transmission is adopted between described impeller and described pump shaft.
4. low net positive suction head centrifugal pump according to claim 1, is characterized in that:
Key transmission is adopted between described inducer and described pump shaft.
5. low net positive suction head centrifugal pump according to claim 1, is characterized in that:
Described pump cover is embedded with quiet guide bearing in the side of pressure-bearing.
6. low net positive suction head centrifugal pump according to claim 5, is characterized in that:
Described pump shaft is set with in the part corresponding with described pump cover that bearing is dynamic to be overlapped;
Supported by described quiet guide bearing between the dynamic cover of described bearing and described pump cover.
7. low net positive suction head centrifugal pump according to claim 5, is characterized in that:
Seal ring is provided with between the water sucking mouth of described impeller and the madial wall of the described pump housing.
8. low net positive suction head centrifugal pump according to claim 1, is characterized in that:
Removably connected by fastener assembly between the described pump housing and described external suspension frame flange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410664707.2A CN104454638A (en) | 2014-11-19 | 2014-11-19 | Low-NPSHR centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410664707.2A CN104454638A (en) | 2014-11-19 | 2014-11-19 | Low-NPSHR centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104454638A true CN104454638A (en) | 2015-03-25 |
Family
ID=52901219
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410664707.2A Pending CN104454638A (en) | 2014-11-19 | 2014-11-19 | Low-NPSHR centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104454638A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237760A (en) * | 2017-08-09 | 2017-10-10 | 重庆博张机电设备有限公司 | A kind of vertical pump for liquid salts |
| CN108518362A (en) * | 2018-03-28 | 2018-09-11 | 兖矿鲁南化工有限公司 | A kind of system and method for pumping generation cavitation preventing conveying high temperature, low boiling point working medium |
| CN110307164A (en) * | 2019-07-25 | 2019-10-08 | 中国船舶重工集团公司第七0四研究所 | Condensate pump flow passage components structure with inducer |
| CN114396383A (en) * | 2022-01-10 | 2022-04-26 | 成都凯天电子股份有限公司 | Oil-gas mixed transportation system |
-
2014
- 2014-11-19 CN CN201410664707.2A patent/CN104454638A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107237760A (en) * | 2017-08-09 | 2017-10-10 | 重庆博张机电设备有限公司 | A kind of vertical pump for liquid salts |
| CN108518362A (en) * | 2018-03-28 | 2018-09-11 | 兖矿鲁南化工有限公司 | A kind of system and method for pumping generation cavitation preventing conveying high temperature, low boiling point working medium |
| CN110307164A (en) * | 2019-07-25 | 2019-10-08 | 中国船舶重工集团公司第七0四研究所 | Condensate pump flow passage components structure with inducer |
| CN114396383A (en) * | 2022-01-10 | 2022-04-26 | 成都凯天电子股份有限公司 | Oil-gas mixed transportation system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150325 |
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| RJ01 | Rejection of invention patent application after publication |