CN107035720A - The transition runner structure and its design method of a kind of centrifugal multistage pump multiple centrifugal pump - Google Patents
The transition runner structure and its design method of a kind of centrifugal multistage pump multiple centrifugal pump Download PDFInfo
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- CN107035720A CN107035720A CN201710226938.9A CN201710226938A CN107035720A CN 107035720 A CN107035720 A CN 107035720A CN 201710226938 A CN201710226938 A CN 201710226938A CN 107035720 A CN107035720 A CN 107035720A
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- bend pipe
- section
- annular
- diffusion
- suction chamber
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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
- 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
-
- 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
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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 present invention relates to pump housing the Hydraulic Design technical field, and in particular to the transition runner structure and its design method of centrifugal multistage pump multiple centrifugal pump.It is spliced using multistage transition runner, every grade of transition runner includes pumping chamber, diffusion bend pipe and suction chamber, pumping chamber is connected with suction chamber, provided with diffusion bend pipe on the outside of suction chamber；The water inlet for spreading bend pipe is connected with pumping chamber at the same level, and the delivery port of diffusion bend pipe is connected with next stage suction chamber, and the suction chamber is full spiral shape, and diffusion bend pipe is annular.Bend pipe is spread using annular, transition runner is more smooth and significantly shortens size so that the compact conformation of the pump housing, intensity is more preferable.Add a complete spiral suction chamber before next stage impeller eye in addition so that the intake performance of fluid more preferably, evenly stablize by flow velocity.
Description
Technical field
The present invention relates to pump housing hydraulic engineering design technical field, and in particular to the transition runner structure of centrifugal multistage pump multiple centrifugal pump and its sets
Meter method.
Background technology
Transition runner is primarily adapted for use in axially split type centrifugal multistage pump multiple centrifugal pump, this kind of pump volute monoblock cast, two ends of rotor branch
Support, pump housing central supported, stability is good.Reliability is high, and maintenance and repair is convenient.Axially split type centrifugal multistage pump multiple centrifugal pump be divided into the pump housing and
Two parts above and below pump cover, monoblock cast.Transition runner is the runner that liquid is moved in interstage flow, and the quality of transition runner design is not only
The profile and Castability of the pump housing are determined, while the efficiency to pump also has a certain impact.
Transition runner refers to the runner for leading to next stage impeller (adjacent or non-conterminous) entrance by first order volute throat, its
Effect be 1. by one-level pumping chamber outlet guide to another grade of impeller eye, liquid flow direction turns over 180 ° or 270 °；2. with most
The speed of volute throat can be converted to pressure energy by small hydraulic loss；3. provide uniform speed for next stage impeller inlet
.It is divided into short transition time runner and long transition runner according to the unusual of transient mode at present.The structure of existing transition runner has
Two kinds of forms of radial diffusion and oblique diffusion.Radial diffusion is that transition runner has a diffusion section, and the section is located in impeller
On heart line, the suction chamber that next stage is transferred to after diffusion section is diffused into certain angle of flare along diffusion runner volute circumference.Tiltedly
It is that diffusion runner does not spread along volute circumference to diffusion, but sideling passes through the pump housing, is directly transferred to next stage suction chamber.Radially expand
Dissipate transition runner efficiency some higher relative to oblique diffusion runner, but appearance and size is bigger, pump body structure is not compact.And it is oblique
Although to diffusion runner compact conformation, hydraulic efficiency reduction, pump cavitation increase.
The transition runner of country's axially split type multistage middle open pump is all absorbed water using long transition runner with half-spiral at present
The mode that room is combined, so not only make it that the appearance and size of the pump housing is excessive, structure is not compact, and causes the net positive suction head of pump
Increase, hydraulic efficiency reduction.
The content of the invention
It is connected for the flowing between preferably solution level, the technical problem to be solved in the invention is：There is provided a kind of new
The design concept that type multistage middle open pump transitions flow passage structure, radial diffusion runner and oblique diffusion runner are combined, reduces pump
Appearance and size, and do not influence the gentle corrosion energy of efficiency of pump.
For the technical problem described in solution, the waterpower of pump can not only be influenceed by designing the transition runner of multistage middle open pump
Efficiency, and make the compact conformation of pump, profile more attractive in appearance.The present invention provides a kind of transition runner structure of centrifugal multistage pump multiple centrifugal pump,
It is spliced including multistage transition runner, every grade of transition runner includes pumping chamber, diffusion bend pipe and suction chamber, pumping chamber and water suction
Room is connected, provided with diffusion bend pipe on the outside of suction chamber；The water inlet for spreading bend pipe is connected with pumping chamber at the same level, spreads the water outlet of bend pipe
Mouth is connected with next stage suction chamber, and the suction chamber is spiral shape, and diffusion bend pipe is annular.
The arc chord angle Ф of the diffusion bend pipe is 180-270 °.
The suction chamber basic circle and pumping chamber basic circle are concentric laying.
The outer cause 5-10 sections of circular arcs of the annular diffusion bend pipe are excessively spliced.
The area in the section of the diffusion bend pipe is divided into rectangular cross section A1, triangular section A2With fan-shaped section A3, A1For
45-6500mm2、A2For 40-4000mm2、A3For 12-3600mm2。
A kind of transition runner construction design method of centrifugal multistage pump multiple centrifugal pump, comprises the following steps：
A, the pumping chamber cross-sectional area of higher level calculating
By the axis plane velocity of impeller eye liquidThe area for obtaining impeller inlet isThe flow velocity for obtaining spiral suction chamber section liquid by suction chamber axis plane velocity coefficient curve isThen the area of its section isWherein kmlAxis plane velocity gradient is represented, Q represents actual flow, kiTable
Show specific speed and axis plane velocity coefficient；
The area of section A chosen on B, the diffusion bend pipe of annular at any anglexCalculating
Wherein φ is arc chord angle；
C, annular diffusion bend pipe section outer wall arc radius Rφ
The area A of the diffusion bend pipe arbitrary section of annularx=2 (A1+A2+A3), wherein A1- rectangular cross section area, A2- three
Angle section area, A3- sector cross-sectional area；Wherein RφFor section outer wall arc radius, r0For section inwall radius of circle, RxFor
Section transition arc, b0It is section angle of flare for suction chamber throat of subordinate width, β；
From triangle relationThenOrder
The area formula arrangement for substituting into the diffusion bend pipe arbitrary section of annular obtains B (Rφ-R0)2+b0(Rφ-r0)-AX=0
Solve equation and obtain radius where diffusion bend pipe section outer wall
D, the area for spreading bend pipe arbitrary section for checking annular
Value range A is calculated by step B and C formula according to flow Q and lift H limiting condition1For 45-6500mm2、
A2For 40-4000mm2、A3For 12-3600mm2, A1- rectangular cross section area, A2- triangular section area, A3- sector section face
Product, the cross-sectional area calculated in step C is checked using above range value, corresponding evaluation is checked within the scope of following
Evaluation accurate and effective, otherwise revised calculating；
E, the diffusion bend pipe section outer wall arc radius R for choosing different cross section calculating annularφ
Choose the diffusion bend pipe section outer wall arc radius R that annular is calculated with step B, C different sectionφ, diffusion bend pipe
Outer cause 5-10 sections of circular arcs are excessively spliced, and the diffusion bend pipe section outer wall arc radius R of annular is calculated respectivelyφ, and use
Step D checks the areal calculation accuracy of the diffusion bend pipe arbitrary section of annular, finally draws each section of diffusion bend pipe of annular
Size complete design.
The pumping chamber cross-sectional area A of higher level in the step AiIt is approximately equal to random angle on diffusion bend pipe annular in step B
The area of section A chosen at degreex。
The present invention has the beneficial effect that：
1st, it is spliced using multistage transition runner, every grade of transition runner includes pumping chamber, diffusion bend pipe and suction chamber, pressure
Hydroecium is connected with suction chamber, provided with diffusion bend pipe on the outside of suction chamber；The water inlet for spreading bend pipe is connected with pumping chamber at the same level, is spread
The delivery port of bend pipe is connected with next stage suction chamber, and the suction chamber is spiral shape, and diffusion bend pipe is annular.Using annular diffusion
Bend pipe, transition runner is more smooth and significantly shortens size so that the compact conformation of the pump housing, intensity is more preferable.In addition in next stage
Add a spiral suction chamber before impeller eye so that the intake performance of fluid more preferably, evenly stablize by flow velocity.
2nd, the arc chord angle Ф of the diffusion bend pipe is 180-270 °.Bend pipe is spread using annular and circular arc angular region is increased,
Help significantly to shorten size.The suction chamber basic circle and pumping chamber basic circle are stable between concentric laying, multistage and vibrated
Smaller operation is more stablized.The outer cause 5-10 sections of circular arcs of the annular diffusion bend pipe are excessively spliced, more fluid
Intake performance more preferably, evenly stablize by flow velocity, and runner is more smooth and abrasion is reduced, service life increase.
3rd, corresponding R can be just calculated by above formula when the area of known section as shown in Figure 1φ、RX, β so that
Draw out the shape of each section.When liquid flows through f-f sections, speed reaches the desin speed of delivery chamber section, cross-sectional area
Should with by the counted area of diffusion bend pipe arbitrary section formula infinitely close, it is ensured that cause that runner is smooth on the premise of performance
Transition, structure type uses the form that radial diffusion and oblique diffusion are combined.Suction chamber refers to one section before impeller eye stream
Road, suction chamber should ensure that liquid flow distribution is uniform before impeller eye, meet the characteristics of motion of fluid, and reduction water suction as small as possible
Hydraulic loss in room.Structure type is inhaled using full spiral-shaped water suction chamber compared to half-spiral and annular suction chamber, spiral shape
Enter the room with intake performance more preferably, the more stable uniform advantage of flow rate of liquid.
4th, prior art《Modern pump is theoretical with designing》In radial diffusion and oblique diffusion two ways are only disclosed, due to this
Invention is additionally arranged annular diffusion bend pipe, and respective design and test stone are not disclosed in the prior art, is calculated using existing formula
Annular diffusion bend pipe data and the pump housing processed does not meet use requirement, and be significantly increased and design and develop difficulty.In practice
The data of annular diffusion bend pipe almost can not be accurately drawn using prior art because applying working condition difference is directly resulted in, and are not had
There is design and with reference to foundation, cause developer can not estimate pump housing using effect, this case is limited by pump housing applying working condition flows
Q and lift H is measured, each area limit value range is calculated by way of setting limit operating mode, passes through limit range value pre-estimation
Count evidence and then clear and definite design accuracy.The outer cause 5-10 sections of circular arcs for spreading bend pipe are excessively spliced simultaneously, chosen not
The diffusion bend pipe section of annular is calculated with section, design error is further reduced and improves using effect.
A kind of transition runner structure for centrifugal pump that the present invention is provided, is inhaled by annular diffusion bend pipe and spiral shape in summary
Hydroecium is constituted, wherein annular diffusion bend pipe combines the advantage of radial diffusion and oblique diffusion, by previous stage delivery chamber throat with
Next stage suction chamber reasonable butt-joint, shortens the length of transition runner so that the structure of pump is compacter, and appearance and size is smaller,
Intensity is more preferable；And spiral-shaped water suction chamber make it that annular diffusion bend pipe smoothly transits with higher level's pumping chamber, subordinate's suction chamber, liquid
Flowing is more uniform and stable, improves the suction effect of pump, reduces the cavitation of pump, and cause the liquid into subordinate's impeller
Body more meets flowing law, reduces rotating vane and stationary parts interferes with each other produced pressure fluctuation, reduce unit
Noise and vibration.The calculating of whole transition runner flow section area is carried out on the basis of the speed of the liquid of impeller eye,
So as to obtain the shape of cross sections.This method meets flow of fluid rule, and calculating process is simple, can be accurately controlled higher level
Area of the pumping chamber section to subordinate's suction chamber section, it is ensured that the normal operation of whole axially split type centrifugal multistage pump multiple centrifugal pump.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is suction chamber throat of subordinate axis plane velocity coefficient curve；
Fig. 3 spreads the sectional view of bend pipe for annular.
Embodiment
A kind of transition runner structure of centrifugal multistage pump multiple centrifugal pump, including multistage transition runner are spliced, every grade of transition runner bag
Pumping chamber 1, diffusion bend pipe 2 and suction chamber 3 are included, pumping chamber 1 is connected with suction chamber 3, the outside of suction chamber 3 is provided with diffusion bend pipe 2；Expand
The water inlet for dissipating bend pipe 2 is connected with pumping chamber 1 at the same level, and the delivery port of diffusion bend pipe 3 is connected with next stage suction chamber 3, described to inhale
Hydroecium 3 is spiral shape, and diffusion bend pipe 3 is annular.The arc chord angle Ф of the diffusion bend pipe 3 is 180-270 °.The suction chamber base
Director circle 4 and pumping chamber basic circle 5 are concentric laying.The outer cause 5-10 sections of circular arcs of the annular diffusion bend pipe 3 excessively splice
Form.The area in the section of the diffusion bend pipe 3 is divided into rectangular cross section A1, triangular section A2With fan-shaped section A3, A1For 45-
6500mm2、A2For 40-4000mm2、A3For 12-3600mm2。
A kind of transition runner construction design method of centrifugal multistage pump multiple centrifugal pump, comprises the following steps：
A, the pumping chamber cross-sectional area of higher level calculating
By the axis plane velocity of impeller eye liquidThe area for obtaining impeller inlet isThe flow velocity for obtaining spiral suction chamber section liquid by suction chamber axis plane velocity coefficient curve isThen the area of its section isWherein kmlAxis plane velocity gradient is represented, Q represents actual flow, kiTable
Show specific speed and axis plane velocity coefficient；
The area of section A chosen on B, the diffusion bend pipe of annular at any anglexCalculating
Wherein φ is arc chord angle；
C, annular diffusion bend pipe section outer wall arc radius Rφ
The area A of the diffusion bend pipe arbitrary section of annularx=2 (A1+A2+A3), wherein A1- rectangular cross section area, A2-
Triangular section area, A3- sector cross-sectional area；Wherein RφFor section outer wall arc radius, r0For section inwall radius of circle, Rx
For section transition arc, b0It is section angle of flare for suction chamber throat of subordinate width, β；
From triangle relationThenOrder
The area formula arrangement for substituting into the diffusion bend pipe arbitrary section of annular obtains B (Rφ-R0)2+b0(Rφ-r0)-AX=0
Solve equation and obtain radius where diffusion bend pipe section outer wall
D, the area for spreading bend pipe arbitrary section for checking annular
Value range A is calculated by step B and C formula according to flow Q and lift H limiting condition1For 45-6500mm2、
A2For 40-4000mm2、A3For 12-3600mm2, A1- rectangular cross section area, A2- triangular section area, A3- sector section face
Product, the cross-sectional area calculated in step C is checked using above range value, corresponding evaluation is checked within the scope of following
Evaluation accurate and effective, otherwise revised calculating；
E, the diffusion bend pipe section outer wall arc radius R for choosing different cross section calculating annularφ
Choose the diffusion bend pipe section outer wall arc radius R that annular is calculated with step B, C different sectionφ, diffusion bend pipe
Outer cause 5-10 sections of circular arcs are excessively spliced, and the diffusion bend pipe section outer wall arc radius R of annular is calculated respectivelyφ, and use
Step D checks the areal calculation accuracy of the diffusion bend pipe arbitrary section of annular, finally draws each section of diffusion bend pipe of annular
Size complete design.
The pumping chamber cross-sectional area A of higher level in the step AiIt is approximately equal to random angle on diffusion bend pipe annular in step B
The area of section A chosen at degreex。
Claims (7)
1. the transition runner structure of a kind of centrifugal multistage pump multiple centrifugal pump, it is characterised in that be spliced including multistage transition runner, every grade of mistake
Crossing runner includes pumping chamber (1), diffusion bend pipe (2) and suction chamber (3), and pumping chamber (1) is connected with suction chamber (3), suction chamber (3)
Outside is provided with diffusion bend pipe (2)；The water inlet of diffusion bend pipe (2) is connected with pumping chamber (1) at the same level, the water outlet of diffusion bend pipe (3)
Mouth is connected with next stage suction chamber (3), and the suction chamber (3) is full spiral shape, and diffusion bend pipe (3) is annular.
2. a kind of transition runner structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the diffusion bend pipe
(3) arc chord angle Ф is 180-270 °.
3. a kind of transition runner structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the suction chamber base
Director circle (4) and pumping chamber basic circle (5) are concentric laying.
4. a kind of transition runner structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the annular expansion
The outer cause 5-10 sections of circular arcs for dissipating bend pipe (3) are excessively spliced.
5. a kind of transition runner structure of centrifugal multistage pump multiple centrifugal pump according to claim 1, it is characterised in that the diffusion bend pipe
(3) area in section is divided into rectangular cross section A1, triangular section A2With fan-shaped section A3, A1For 45-6500mm2、A2For 40-
4000mm2、A3For 12-3600mm2。
6. a kind of transition runner construction design method of centrifugal multistage pump multiple centrifugal pump according to any one of claim 1 to 5, its feature
It is to comprise the following steps：
A, the pumping chamber cross-sectional area of higher level calculating
By the axis plane velocity of impeller eye liquidThe area for obtaining impeller inlet isIt is logical
Cross suction chamber axis plane velocity coefficient curve and obtain the flow velocity of spiral suction chamber section liquid and beThen its section
Area isWherein kmlAxis plane velocity gradient is represented, Q represents actual flow, kiRepresent specific speed and axis plane velocity
Coefficient；
The area of section A chosen on B, the diffusion bend pipe of annular at any anglexCalculating
Wherein φ is arc chord angle；
C, annular diffusion bend pipe section outer wall arc radius Rφ
The area A of the diffusion bend pipe arbitrary section of annularx=2 (A1+A2+A3), wherein A1- rectangular cross section area, A2- triangular section area,
A3- sector cross-sectional area；Wherein RφFor section outer wall arc radius, r0For section inwall radius of circle, RxFor section transition arc,
b0It is section angle of flare for suction chamber throat of subordinate width, β；
From triangle relationThenOrder
The area formula arrangement for substituting into the diffusion bend pipe arbitrary section of annular obtains B (Rφ-R0)2+b0(Rφ-r0)-AX=0 solves equation
Obtain radius where diffusion bend pipe section outer wall
D, the area for spreading bend pipe arbitrary section for checking annular
Value range A is calculated by step B and C formula according to flow Q and lift H limiting condition1For 45-6500mm2、A2For
40-4000mm2、A3For 12-3600mm2, A1- rectangular cross section area, A2- triangular section area, A3- sector cross-sectional area, makes
The cross-sectional area calculated in step C is checked with above-mentioned value range, corresponding evaluation is checked and is calculated within the scope of following
Numerical value accurate and effective, otherwise revised calculating；
E, the diffusion bend pipe section outer wall arc radius R for choosing different cross section calculating annularφ
Choose the diffusion bend pipe section outer wall arc radius R that annular is calculated with step B, C different sectionφ, spread the outer rim of bend pipe
Excessively it is spliced by 5-10 sections of circular arcs, the diffusion bend pipe section outer wall arc radius R of annular is calculated respectivelyφ, and use step D
The areal calculation accuracy of the diffusion bend pipe arbitrary section of annular is checked, finally show that each cross dimensions of diffusion bend pipe of annular is complete
Into design.
7. a kind of transition runner construction design method of centrifugal multistage pump multiple centrifugal pump according to any one of claim 1 to 5, its feature
It is the pumping chamber cross-sectional area A of higher level in the step AiIt is approximately equal on diffusion bend pipe annular in step B at any angle
The area of section A of selectionx。
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| CN201710226938.9A CN107035720B (en) | 2017-04-07 | 2017-04-07 | Transition flow passage structure of multistage centrifugal pump and design method thereof |
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| CN201710226938.9A CN107035720B (en) | 2017-04-07 | 2017-04-07 | Transition flow passage structure of multistage centrifugal pump and design method thereof |
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| CN107035720B CN107035720B (en) | 2023-06-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588008A (en) * | 2017-10-19 | 2018-01-16 | 江苏国泉泵业制造有限公司 | A kind of double outlet multipurpose external-mix self-priming pumps with similar spiral shape suction room |
| CN108071614A (en) * | 2017-12-07 | 2018-05-25 | 浙江大学 | A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump |
| CN108150448A (en) * | 2017-10-19 | 2018-06-12 | 浙江理工大学 | A kind of method for designing impeller of not equidistant runner pump |
| CN111336131A (en) * | 2020-03-19 | 2020-06-26 | 大连环友屏蔽泵有限公司 | Axial force optimization design method for canned motor pump |
| CN111523186A (en) * | 2020-05-19 | 2020-08-11 | 重庆水泵厂有限责任公司 | Method for optimizing shape of water suction chamber for double-water-suction pump |
| CN114483595A (en) * | 2021-12-24 | 2022-05-13 | 江西耐普矿机股份有限公司 | Hydraulic design method of quasi-annular pumping chamber for slurry pump and pumping chamber of slurry pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588008A (en) * | 2017-10-19 | 2018-01-16 | 江苏国泉泵业制造有限公司 | A kind of double outlet multipurpose external-mix self-priming pumps with similar spiral shape suction room |
| CN108150448A (en) * | 2017-10-19 | 2018-06-12 | 浙江理工大学 | A kind of method for designing impeller of not equidistant runner pump |
| CN108150448B (en) * | 2017-10-19 | 2023-09-29 | 浙江理工大学 | Impeller design method of unequal-spacing runner pump |
| CN107588008B (en) * | 2017-10-19 | 2024-04-19 | 江苏国泉泵业制造有限公司 | Double-outlet multipurpose external mixing self-priming pump with quasi-spiral suction chamber |
| CN108071614A (en) * | 2017-12-07 | 2018-05-25 | 浙江大学 | A kind of spiral case and its design method suitable for centrifugal multistage pump multiple centrifugal pump |
| CN111336131A (en) * | 2020-03-19 | 2020-06-26 | 大连环友屏蔽泵有限公司 | Axial force optimization design method for canned motor pump |
| CN111523186A (en) * | 2020-05-19 | 2020-08-11 | 重庆水泵厂有限责任公司 | Method for optimizing shape of water suction chamber for double-water-suction pump |
| CN111523186B (en) * | 2020-05-19 | 2024-01-19 | 重庆水泵厂有限责任公司 | Optimization method of shape of water suction chamber for double water suction pump |
| CN114483595A (en) * | 2021-12-24 | 2022-05-13 | 江西耐普矿机股份有限公司 | Hydraulic design method of quasi-annular pumping chamber for slurry pump and pumping chamber of slurry pump |
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| Publication number | Publication date |
|---|---|
| CN107035720B (en) | 2023-06-02 |
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