CN108071614A - A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump - Google Patents
A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump Download PDFInfo
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- CN108071614A CN108071614A CN201711281640.4A CN201711281640A CN108071614A CN 108071614 A CN108071614 A CN 108071614A CN 201711281640 A CN201711281640 A CN 201711281640A CN 108071614 A CN108071614 A CN 108071614A
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- spiral case
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- centrifugal pump
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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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention provides a kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump, including spiral case main body, spiral case amplification pipe and transition portion, spiral case diffuser is located at the one side of spiral case main body, the length of spiral case amplification pipe extends to the opposite side with its starting point in the spiral case main body at 180 ° of angles, transition portion is arranged on the top of spiral case main body, for the connection between the grade and grade of centrifugal multistage pump multiple centrifugal pump.The present invention also provides a kind of design methods of above-mentioned spiral case.The present invention combines hydromechanical scientific analysis and Conventional wisdom design, according to the performance parameter of centrifugal multistage pump multiple centrifugal pump requirement, the shape of spiral case and the caliber and spiral path of spiral case diffuser are reasonably and accurately devised, considerably increases the utilization rate of energy, improves the efficiency of centrifugal pump.
Description
Technical field
The present invention relates to field of fluid machinery is belonged to, it is related to centrifugal multistage pump multiple centrifugal pump, and in particular to a kind of novel multistage centrifugal pump
Spiral case and its design method.
Background technology
Centrifugal multistage pump multiple centrifugal pump at least two-stage series connection can realize higher lift than centrifugal pump of single stage type.The multistage centrifugal efficiency of pump
It is higher, it disclosure satisfy that the needs of high-lift high flow capacity operating mode, be widely used in mining drainage, urban water supply and sewerage, farmland irrigating
Generally, the industry-by-industry of the national economy such as petrochemical industry, forest fire prevention and control, skyscraper.The average annual power consumption of centrifugal pump accounts for always generating electricity
More than the 10% of amount, wherein centrifugal multistage pump multiple centrifugal pump accounts for main power consuming portions again, so being optimized not only to centrifugal multistage pump multiple centrifugal pump
To improving performance of centrifugal pump, Synergistic and energy-saving is of great significance, also has a tremendous social and economic benefits.
In the process of running, except as centrifugal pump of single stage type, current are by entrance, impeller, spiral case etc. for centrifugal multistage pump multiple centrifugal pump
The Complex Phenomena in Vertical Bell Jar such as friction, collision, Secondary Flow, reflux, whirlpool can be generated during component, cause the loss of energy, in grade and grade
Between transition portion, more since fluid turns to big, impact loss is also very serious.Wherein spiral case is the running of centrifugal pump
Important component.The effect of spiral case has collection fluid, and converts kinetic energy into the stagnation pressure of outlet as far as possible, except ensureing spiral case
The interior small streamline of impact loss is smooth, and volute outlet and the transition to subordinate's volute inlet are also required to ensure that capacity loss is smaller.
The content of the invention
Technical problems to be solved first of the invention are to provide a kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump, can improve more
Streamline distribution and reduction fluid impact loss between grade centrifugal pump stage and grade.
Technical solution is used by the present invention solves above-mentioned technical problem：A kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump,
Including spiral case main body, spiral case amplification pipe and transition portion, spiral case diffuser is located at the one side of spiral case main body, and spiral case expands the length of pipe
Degree extends to the opposite side in the spiral case main body at 180 ° of angles, transition portion with its starting point and is arranged on the top of spiral case main body, is used for
Connection between the grade and grade of centrifugal multistage pump multiple centrifugal pump.
Further, spiral case main body is divided into eight main paragraphs along its circumferential direction, and spiral case amplification pipe is divided into and spiral case master
The area of the corresponding four amplifications pipeline section of four main paragraphs of body one side, main paragraph and amplification pipe end is according to velocity-coefficient method meter
It obtains.
Further, transition portion plays the role of suction chamber, and diffusion angle and the base circle diameter (BCD) requirement of transition portion are true
Protecting the fluid passed through has vortex.
Another technical problem to be solved by this invention is to provide a kind of design method of above-mentioned spiral case, and this method is specific
Comprise the following steps：
（1）Calculate the cross-sectional area of spiral case main body；
（2）Calculate the cross-sectional area of spiral case amplification pipe；
（3）Calculate the spiral path of spiral case amplification pipe；
（4）Calculate the amplification angle and base circle diameter (BCD) of transition portion.
Further, the cross-sectional area for calculating spiral case main body specifically includes：
（1.1）Spiral case main body is divided into eight main paragraphs along its circumferential direction, is divided between section and section by partition line；
（1.2）According to velocity-coefficient method, the area of the section of each main paragraph is acquired respectively.
Further, the cross-sectional area for calculating spiral case amplification pipe specifically includes：
（2.1）The extended line of spiral case amplification pipe along partition line is divided into four amplification pipeline sections；
（2.2）According to velocity-coefficient method, each cross-sectional area for expanding pipeline section is acquired respectively.
Further, the spiral path for calculating diffuser specifically includes：
（3.1）According to fluid simulation emulation is calculated, the distance at the centre distance spiral case center of one section of diffuser outermost
As key Design variable；
（3.2）According to the numerical value for changing different designs variable, the peak efficiency value of centrifugal pump is acquired, so as to obtain diffuser
Spiral path.
The beneficial effects of the invention are as follows：The present invention combines hydromechanical scientific analysis and Conventional wisdom design, according to more
The performance parameter of grade centrifugal pump requirement, reasonably and accurately devises the shape of spiral case and the caliber of spiral case diffuser and spiral road
Footpath, and the transition portion between grade and grade is designed according to the design principle of suction chamber so that previous stage in transition portion
Being vortexed for outlet can prewhirl for the entrance increase of rear stage, considerably increase the utilization rate of energy, improve the efficiency of centrifugal pump.
Description of the drawings
Fig. 1 is the top view of the spiral case of the present invention.
Fig. 2 is the side view of the spiral case of the present invention.
Fig. 3 is the CFD analog simulation calculating figures of spiral case.
Figure label：1- spiral case main bodys, 2- spiral cases amplification pipe, 3- transition portions, 4- partition lines, 5- main paragraphs, 6- amplifications
Pipeline section.
Specific embodiment
Technical scheme is described in further details below in conjunction with specific embodiment, it should be noted that real
It is only to play the role of explanation to apply example, is not limitation of the invention.
Referring to the drawings 1-2.
Embodiment 1, a kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump.
The spiral case of the present embodiment is suitable for centrifugal multistage pump multiple centrifugal pump, and pipe 2 and transition portion 3 are expanded including spiral case main body 1, spiral case,
Spiral case diffuser 2 is located at the one side of spiral case main body 1, and the length of spiral case amplification pipe 2 extends to the spiral case with its starting point in 180 ° of angles
The opposite side of main body 1, transition portion 3 are arranged on the top of spiral case main body 1, for the company between the grade and grade of centrifugal multistage pump multiple centrifugal pump
It connects.
Spiral case main body 1 is divided into eight main paragraphs 5, spiral case amplification the prolonging by partition line 4 of pipe 2 along its circumferential direction by partition line 4
Long line is divided into and four main paragraphs of 1 one side of spiral case main body, 5 corresponding four amplification pipeline sections 6, main paragraph 5 and amplification pipe end 6
Area be calculated according to velocity-coefficient method.
In order to increase capacity usage ratio and improve the efficiency between centrifugal pump stage and grade, transition portion 3 plays suction chamber
Effect, i.e., what previous stage exported in transition portion is vortexed and can prewhirl for the entrance increase of rear stage, therefore, transition portion 3
Diffusion angle and base circle diameter (BCD) requirement ensure by fluid have be vortexed.
Embodiment 2, the design method of spiral case.
Volute Design method in the present embodiment is for the spiral case in design embodiments 1.
This method specifically includes following steps：
（1）Calculate the cross-sectional area of spiral case main body；
（1.1）Spiral case main body is divided into eight main paragraphs along its circumferential direction, is divided between section and section by partition line；
（1.2）According to velocity-coefficient method, the area of the section of each main paragraph is acquired respectively.
Cut water laying angle is, pass through the flow of the 8th section, wherein Q is design stream
Amount,It is arrived for the 8th section around rotation reverse directionAngle.8th cross-sectional area, whereinFor volute casing section
Average speed, according to formulaIt acquiring, g is acceleration of gravity, and H is the lift of pump,According to setting for pump
Meter handbook is looked into.Other 7 cross-sectional areas are determined according to each section speed of volute chamber is equal
（2）Calculate the cross-sectional area of spiral case amplification pipe；
（2.1）The extended line of spiral case amplification pipe along partition line is divided into four amplification pipeline sections；
（2.2）According to step（1.2）Velocity-coefficient method similarly（8 sections in step 1.2 are changed to 4 sections）, point
The cross-sectional area of each amplification pipeline section is not acquired.
（3）Calculate the spiral path of spiral case amplification pipe；
（3.1）According to fluid simulation emulation is calculated, the distance at the centre distance spiral case center of one section of diffuser outermost
As key Design variable x.
（3.2）According to the numerical value for changing different designs variable x, the peak efficiency value of centrifugal pump is acquired, so as to be spread
The spiral path of pipe.
By taking the centrifugal pump of model MSD100-80x10 as an example, technology requirement is flow Q=100m3/ h, lift are
80x10m, rotating speed 2950r/min, necessary electromotor 355KW, spiral case base circle diameter (BCD) 297mm, x are according to the second section to spiral case
The distance at center, value range are chosen between 220 to 240, and step-length takes 2mm, establish 10 sample points, 4 of amplification pipe
Link up at section center so that three lines are respectively perpendicular first three section, so as far as possible ensure fluid by each section it
Speed afterwards is parallel with section normal vector.As x=236mm, the 2nd stage efficiency reaches maximum, simulation results show 10 grades from
The 2nd grade of shaft power of heart pump is 26.08KW, lift 83.86m, and according to η=HQ ρ g/P, without considering loss, efficiency works as x up to 87.6%
When taking 228mm, analog result shows the 2nd grade of shaft power 30.87KW, lift 79.69, according to η=HQ ρ g/P, without considering damage
It loses, efficiency reaches minimum value 70.4%.Wherein η is efficiency, and H is flow for lift unit m, Q, unit m3/ s, ρ water it is close
Degree, unit kg/m3, P is shaft power, unit W.
（4）Calculate the amplification angle and base circle diameter (BCD) of transition portion.
Transition portion base circle diameter (BCD) subtracts the diameter of the main shaft between passing through, annular section area and spiral case main body
8 cross-sectional areas are equal.Transition portion throat width is chosen according to transition portion base circle diameter (BCD), generally selects 0.4-0.5 times of basic circle
Diameter.
Embodiment 3, the CFD analog simulations of spiral case.
Fig. 3 is the motion pattern that the CFD analog simulations for the spiral case that embodiment 2 designs calculate, as shown in the figure, according to centrifugation pump efficiency
Rate formula, wherein H is lift, and Q is flow,For the density of water, g is acceleration of gravity, and N is shaft power.
Simulation result shows that shaft power is 27.13KW, and efficiency 80.3% compared with country is to the level-one Energy Efficiency Standard 72.9% of pump, is imitated
Rate tool is significantly improved.
Claims (8)
1. a kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump, including spiral case main body, spiral case amplification pipe and transition portion, spiral case diffuser
Positioned at the one side of spiral case main body, it is characterized in that, the length of spiral case amplification pipe extends to the spiral case main body with its starting point in 180 ° of angles
Opposite side, transition portion is arranged on the top of spiral case main body, for the connection between the grade and grade of centrifugal multistage pump multiple centrifugal pump.
2. a kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterized in that, spiral case main body is along its circumferential direction
Eight main paragraphs are divided into, spiral case amplification pipe is divided into four amplifications corresponding with four main paragraphs of spiral case body side
The area of pipeline section, main paragraph and amplification pipe end is calculated according to velocity-coefficient method.
3. a kind of spiral case suitable for centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterized in that, transition portion plays water suction
The effect of room, transition portion diffusion angle and base circle diameter (BCD) requirement ensure by fluid have be vortexed.
4. a kind of design method of spiral case suitable for centrifugal multistage pump multiple centrifugal pump, it is characterized in that, which will for designing right
The spiral case any one of 1-3 is sought, and is comprised the following steps：
（1）Calculate the cross-sectional area of spiral case main body；
（2）Calculate the cross-sectional area of spiral case amplification pipe；
（3）Calculate the spiral path of spiral case amplification pipe；
（4）Calculate the amplification angle and base circle diameter (BCD) of transition portion.
5. a kind of design method of spiral case suitable for centrifugal multistage pump multiple centrifugal pump according to claim 4, it is characterized in that, calculate snail
The cross-sectional area of shell main body specifically includes：
（1.1）Spiral case main body is divided into eight main paragraphs along its circumferential direction, is divided between section and section by partition line；
（1.2）According to velocity-coefficient method, the area of the section of each main paragraph is acquired respectively.
6. a kind of design method of spiral case suitable for centrifugal multistage pump multiple centrifugal pump according to claim 5, it is characterized in that, calculate snail
The cross-sectional area of shell amplification pipe specifically includes：
（2.1）The extended line of spiral case amplification pipe along partition line is divided into four amplification pipeline sections；
（2.2）According to velocity-coefficient method, each cross-sectional area for expanding pipeline section is acquired respectively；
（2.3）4 section centers of amplification pipe are linked up so that three lines are respectively perpendicular to first three section, so to the greatest extent
Amount ensures that fluid is parallel with section normal vector by the speed after each section.
7. a kind of design method of spiral case suitable for centrifugal multistage pump multiple centrifugal pump according to claim 4, it is characterized in that, it calculates and expands
The spiral path of separate tube specifically includes：
（3.1）According to fluid simulation emulation is calculated, the distance at the centre distance spiral case center of one section of diffuser outermost
As key Design variable；
（3.2）According to the numerical value for changing different designs variable, the peak efficiency value of centrifugal pump is acquired, so as to obtain diffuser
Spiral path.
8. a kind of design method of spiral case suitable for centrifugal multistage pump multiple centrifugal pump according to claim 4, it is characterized in that,
Spiral case base circle diameter (BCD) is chosen according to impeller outer diameter, takes 1.03 ~ 1.08 times of impeller outer diameters, ensures to leave between basic circle and impeller
Suitable gap；This gap has the efficiency of centrifugal pump and vibration very big influence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711281640.4A CN108071614A (en) | 2017-12-07 | 2017-12-07 | A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711281640.4A CN108071614A (en) | 2017-12-07 | 2017-12-07 | A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump |
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|---|---|
| CN108071614A true CN108071614A (en) | 2018-05-25 |
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ID=62158166
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711281640.4A Pending CN108071614A (en) | 2017-12-07 | 2017-12-07 | A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1184824A (en) * | 1966-03-24 | 1970-03-18 | Sulzer Ag | Improvements in and relating to Multi-Stage Pump Units and Pump Turbine Units of Radial Flow Construction in Pumped Storage Power Stations |
| CN201090462Y (en) * | 2007-08-15 | 2008-07-23 | 沈阳鼓风机(集团)有限公司 | Enclosed high energy head model level |
| CN107035720A (en) * | 2017-04-07 | 2017-08-11 | 兰州兰泵有限公司 | The transition runner structure and its design method of a kind of centrifugal multistage pump multiple centrifugal pump |
-
2017
- 2017-12-07 CN CN201711281640.4A patent/CN108071614A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1184824A (en) * | 1966-03-24 | 1970-03-18 | Sulzer Ag | Improvements in and relating to Multi-Stage Pump Units and Pump Turbine Units of Radial Flow Construction in Pumped Storage Power Stations |
| CN201090462Y (en) * | 2007-08-15 | 2008-07-23 | 沈阳鼓风机(集团)有限公司 | Enclosed high energy head model level |
| CN107035720A (en) * | 2017-04-07 | 2017-08-11 | 兰州兰泵有限公司 | The transition runner structure and its design method of a kind of centrifugal multistage pump multiple centrifugal pump |
Non-Patent Citations (1)
| Title |
|---|
| 关醒凡: "《现代泵理论与设计》", 30 April 2011, 中国宇航出版社 * |
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Application publication date: 20180525 |
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