CN108700078A - Diffuser and multistage pump installation - Google Patents
Diffuser and multistage pump installation Download PDFInfo
- Publication number
- CN108700078A CN108700078A CN201780014161.8A CN201780014161A CN108700078A CN 108700078 A CN108700078 A CN 108700078A CN 201780014161 A CN201780014161 A CN 201780014161A CN 108700078 A CN108700078 A CN 108700078A
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- CN
- China
- Prior art keywords
- diffuser
- housing section
- flow path
- impeller
- alar part
- Prior art date
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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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
- F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
- F04D1/08—Multi-stage pumps the stages being situated concentrically
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage pumps
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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
- F04D11/00—Other rotary non-positive-displacement 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
Landscapes
- 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 diffusers and multistage pump installation, diffuser (250) to have:Housing section (260,270), with the flow path of the model split cylindrical shape to attenuate from the inflow side of fluid towards outflow side diameter;With multiple diffuser alar parts (280), they are multiple in cylindric flow arrangement, and cylindric flow path is divided into helical form.For multiple diffuser alar parts (280), at the arbitrary meridian plane position of housing section (260,270), diffuser wing angle beta w will be defined as relative to the aerofoil tangential direction angulation of the circumferential direction of rotary shaft and diffuser alar part.Unit change amount Δ Xcs (mm) of the diffuser wing angle beta w (°) relative to meridian plane position is changed with meeting the variation delta β w of the relationship of 2.4 Δ Xc of Δ β w <.In addition, diffuser wing angle beta w is less than 90 ° in all regions.
Description
Technical field
The present invention relates to diffuser and multistage pump installations.
Background technology
In the past, multistage pump was widely used for trandfer fluid.Multistage pump passes through the multistage leaf that will be configured along drive shaft
Wheel is contained in the diffuser for the flow path for dividing fluid and constitutes.Diffuser by the fluid that impeller is boosted spirally guide and into
Row rectification, and conveyed to subordinate's impeller.In multistage pump, by changing the series of impeller and diffuser, so as to obtain
Desired lift.
Patent document 1:Japanese Unexamined Patent Publication 6-323291 bulletins
In multistage pump installation, set in such a way that energy conversion efficiency when defined specified discharge rate operates is highest by making
Count the shape of diffuser.Such as under normal circumstances, the angle beta w for the diffuser wing for dividing internal flow path is designed as by diffuser:It will
The rotary speed ingredient for exporting fluid remove and towards axial direction.But in order to inhibit the stripping of the fluid in diffuser and removing goes out
The rotary speed ingredient of mouth fluid needs the axial length for increasing diffuser, therefore there are problems that pumping overall length increases.
In addition, in order in the short diffuser of axial length, the rotary speed ingredient of outlet fluid is eliminated, needs to increase
The angle beta w of the diffuser wing, from entrance to outlet, the increase of wing angle beta w also becomes larger.In this case, the fluid in diffuser
Stripping is easy tod produce, to cause the efficiency of diffuser to reduce due to the Secondary Flow (turbulent flow of fluid) in diffuser.In addition,
In the case that impeller is Chong Die with diffuser multistage, subordinate's impeller below can be influenced in the stripping that supervisory diffuser generates
And diffuser, it is reduced so as to cause energy efficiency.
Invention content
The present invention is made in view of the above subject, it is therefore intended that proposes the multistage pump installation in multistage overlapping diffuser
In, small-sized and high energy conversion efficiency diffuser and multistage pump installation.
The present invention diffuser be used for multistage pump, the diffuser by with the impeller rotated around rotary shaft it is concentric in a manner of match
It sets, the fluid being induced to the rotation with impeller guides.The diffuser has:Housing section, with from the stream of fluid
Enter the flow path for the model split cylindrical shape that side attenuates towards outflow side diameter;With multiple diffuser alar parts, they are in cylindrical shape
Flow arrangement is multiple, and cylindric flow path is divided into helical form.It, will be in the arbitrary of housing section for multiple diffuser alar parts
At meridian plane position, it is defined as spreading relative to the circumferential direction of rotary shaft and the aerofoil tangential direction angulation of diffuser alar part
Device wing angle beta w.The diffuser wing angle beta w (°) is relative to the unit change amount Δ Xc (mm) of meridian plane position to meet Δ β w
The variation delta β w variations of the relationship of 2.4 Δ Xc of <.In addition, diffuser wing angle beta w is less than 90 ° in all regions.By
This, in the outlet fluid of diffuser, there are rotary speed ingredients, from regardless of how pump discharge can make going out for each diffuser
Mouth fluid stable, can realize small-sized and high energy conversion efficiency multistage pump installation.
Additionally, it is preferred that being the son of the maximum outside diameter φ Dc for the flow path that housing section is divided and the peripheral side of diffuser alar part
Noon face chord degree Lc meets the relationship of Lc/ φ Dc < 0.64.
Additionally, it is preferred that being the son of the maximum inner diameter φ Dh for the flow path that housing section is divided and the inner circumferential side of diffuser alar part
Noon face chord degree Lh meets the relationship of Lh/ φ Dh < 0.63.
Additionally, it is preferred that being, the meridian plane chord degree Lh of the inner circumferential side of diffuser alar part is the meridian plane chord degree of peripheral side
Lc or less.
Additionally, it is preferred that being, the wall surface of the inner circumferential side of the outflow side end of housing section is becoming maximum than the internal diameter of flow path
At the downstream of position, meet θ o > 1500Ns relative to than fast Ns with the maximum value θ o at angle formed by rotary shaft-0.6Pass
System.Here, by the rotary speed (min of pump-1) it is set as Np, by discharge rate (m3/ min) it is set as Qp, total (pumping) head (m) is set as Hp,
Then than fast Ns Ns=(NpQp1/2)/Hp3/4It indicates.
The multistage pump installation of the present invention has:The diffuser of multistage aforementioned present invention;With multistage with the diffuser with concentric
The impeller that round shape configures and induces fluid to diffuser.
According to the multistage pump installation, effect identical with the diffuser of the present invention can be played.
In addition, multistage pump installation can also have the power source for making impeller rotate.
Description of the drawings
Fig. 1 is the longitudinal section view for the multistage pump installation for schematically showing present embodiment.
Fig. 2 is to amplify the schematic diagram shown around the diffuser by present embodiment.
Fig. 3 is the schematic diagram for omitting outside housing section and showing the inside housing section and diffuser alar part of diffuser.
Fig. 4 is the figure of the efficiency curve for the impeller for indicating the discharge rate relative to multistage pump.
Fig. 5 is the figure of the efficiency curve for the diffuser for indicating the discharge rate relative to multistage pump.
Specific implementation mode
Hereinafter, being said to the diffuser of an embodiment of the present application and multistage pump installation based on attached drawing
It is bright.In the following embodiments, it is illustrated as an example to having the deep-well submersible motor of immersible pump pump, the present invention
It is not limited to such example, but can be applied to various multistage pump installations and diffuser.
Fig. 1 is the longitudinal section view for the multistage pump for schematically showing present embodiment.In figure, thick-line arrow is schematically shown
Go out the flowing of fluid.As shown in Figure 1, multistage pump installation 10 has:As power source motor 100 and be installed on motor 100
The pumping section 200 on top.
Motor 100 is connected to external power supply (not shown) via cable 102.The drive shaft 104 of motor 100 is via connector
106 are connected to the main shaft 230 of pumping section 200.In the present embodiment, the main shaft of the drive shaft 104 and pumping section 200 of motor 100
230, extend along the directions axis (rotary shaft) Aw and concentrically configures.As long as motor 100 can be such that the main shaft 230 of pumping section 200 revolves
Turn, then can use any motor.Motor 100 is not core of the invention, therefore is illustrated for detailed incomplete structure.
Pumping section 200 has:Suction casing 210, discharge shell 220, main shaft 230, impeller 240 and diffuser 250.
Suction casing 210 is set to the top of motor 100, is configured as the most subordinate of pumping section 200.Suction casing 210
The shell 108 of the assembled portion 212 of lower part and motor 100 is fastened by using Screw 214 and is fixed on motor 100.Sucking
Shell 210 is shaped generally as cylindrical shape, and the suction inlet 216 for sucking fluid is formed in the top of assembled portion 212.In suction casing
The assembled portion 252 of diffuser 250 is fastened by using Screw 253 and is fixed with expansion by the assembled portion 218 on the top of body 210
Dissipate device 250.
Discharge shell 220 is set to the top of diffuser 250, is configured as the most higher level of pumping section 200.Shell is discharged
The assembled portion 222 of lower part and the assembled portion 254 of diffuser 250 are fastened by using Screw 255 and are fixed on diffuser by 220
250.Discharge shell 220 is shaped generally as cylindrical shape, and the assembled portion 224 on top is installed on discharge piping (not shown).Shell is discharged
Body 220 has the check-valves 226 for inhibiting fluid countercurrent current in inside.
Main shaft 230 is connected to motor 100 via connector 106, and inserts the interior of suction casing 210 and diffuser 250
Portion.Main shaft 230 is pivotally supported by the bearing sleeve 268 of diffuser 250.Multiple impellers 240, multiple impellers are installed in main shaft 230
240 rotate with the rotation of main shaft 230.
Impeller 240 has:Cylindric insertion section for being inserted into main shaft 230 and the peripheral surface that is installed on insertion section
Multiple blades.Impeller 240 is rotated integrally with main shaft 230, by multiple blades by fluid from upstream (in figure lower section) downstream (in figure
Top) force feed.
Diffuser 250 is concentrically configured by formation such as metal or resins with the rotary shaft (main shaft 230) of impeller 240.Figure
2 be the schematic diagram for amplifying around the diffuser by present embodiment and showing.In addition, Fig. 2 shows the sections along axis Aw, but
For diffuser alar part 280, a diffuser alar part 280 is shown along aerofoil.In addition, for diffuser alar part 280
Though not being section but for easy understanding marking grid lines.Hereinafter, by " meridian plane " is known as along the section of axis Aw.
In this embodiment, diffuser 250 accommodates main shaft 230 and impeller 240, and divides the flow path of fluid.Diffuser
250 in order to prevent the adverse current of fluid and have grommet 258 between impeller 240.Diffuser 250 has assembled portion up and down
252,254, suction casing 210 can be carried out and the fixation of shell 220 is discharged.In addition, diffuser 250 by diffuser 250 with
The group of impeller 240 can be laminated multistage and be formed and (in the example of Fig. 1, be laminated with two level) as level-one.
Fig. 3 is the schematic diagram for omitting outside housing section and showing the inside housing section and diffuser alar part of diffuser.In addition
In figure 3, as corresponding with Fig. 2, grid lines is marked in the aerofoil of a diffuser alar part 280.Such as Fig. 2 and Fig. 3 institutes
Show, diffuser 250 has:Divide flow path inner wall inside housing section 260, divide flow path outer wall outside housing section 270,
And the multiple diffuser alar parts 280 for connecting inside housing section 260 with outside housing section 270.In addition, inside housing section 260,
Outside housing section 270 and diffuser alar part 280 can be integrally formed for example, by casting of metal etc., can also distinguish shape
At and connect.
The bearing sleeve 268 (referring to Fig.1) being inserted into for main shaft 230 is provided in interior side body portion 260.Such as Fig. 1~Fig. 3 institutes
Show, inside housing section 260 is formed as the approximate cylinder shape that (downstream) diameter more becomes smaller more upward.Outside housing section 270
In a manner of dividing flow path between inside housing section 260, have in inside corresponding with the outer profile of inside housing section 260
The space of shape.That is, outside housing section 270 is formed as hollow shape, and be formed as diameter more upward more become smaller it is close
Like cylindrical shape.Inside housing section 260 is separately from each other with outside housing section 270, thus divides what confession was induced from impeller 240
Fluid by cylindric flow path Fc.
Inside housing section 260 and outside housing section 270 in the state of being separated from each other by it is multiple (in the present embodiment for
Seven) connection of diffuser alar part 280.Multiple diffuser alar parts 280 are with relative to axis Aw, circumferentially impartial position relationship is matched
It is placed in cylindric flow path Fc, and is respectively formed as the plate with smooth curved plate face (aerofoil).
As shown in FIG. 2 and 3, diffuser alar part 280 is circumferentially rotatable and is configured to by aerofoil to by interior side body
The cylindric flow path Fc that portion 260 and outside housing section 270 divide is divided.Diffuser alar part 280 is set as:In lower end
(end of the inflow side of flow path), plate face is approximately axially vertical with main shaft 230, at the upper end (end of the outflow side of flow path
Portion), plate face is approximately axially parallel with main shaft 230.Thus diffuser alar part 280 will be by inside housing section 260 and outside shell
The space that portion 270 divides is divided into multiple spiral helicine flow paths.
In the present embodiment, diffuser alar part 280 is configured to:Wing angle beta w is changed with small change amount Δ β w.
This, wing angle beta w is cut along the tangent line of the wing thickness center line Cd of the diffuser alar part 280 of the flow path of fluid, with around relative to this
The circumferential tangent line Rd angulations (°) of the axis Aw of line.In addition in the present embodiment, the thickness of diffuser alar part 280
The tangent line of constant, the center line Cd of wing thickness is roughly the same with the tangent line of aerofoil.But wing angle beta w can also replace the wing thick
Center line Cd but the aerofoil of the upstream side of diffuser alar part 280 (being downside in figure) or downstream side (being upside in figure)
Tangent line, the tangent line Rd angulations (°) with the circumferential direction around axis Aw.The wing angle beta w is according to inside housing section 260 and outside
The position Xc (mm) of the meridian plane in side body portion 270 and change (with reference in figure relative to the wing angle beta w (Xc1) of position Xc1 with
And the wing angle beta w (Xc2) relative to position Xc2).Specifically, wing angle beta w (is in figure in the entrance of diffuser 250
Lower section) become smaller, become larger near exit (being top in figure).Thereby, it is possible to being induced from impeller 240 containing circumferential flowing
The more fluid of ingredient carries out rectification, and downstream (being top in figure) guiding.Moreover, for the diffuser wing of present embodiment
For portion 280, the variation delta β w of the wing angle beta w of the unit change amount Δ Xc of the position Xc relative to meridian plane, all
Region meets relationship shown in following formula (1).In other words, for wing angle beta w, differential has been carried out at the Xc of meridian plane position
Derivative in all regions, for be less than 2.4 (°/mm) value.In addition, diffuser wing angle beta w is formed as in all regions
Less than 90 °.As a result, intentionally rotary speed ingredient is left in the fluid of the outlet discharge from diffuser 250.In this way, passing through rule
Wing angle beta w is determined to design diffuser alar part 280, even if to inhibit diffuser 250 if reducing the length of meridian plane
Interior fluid generates stripping.In addition, the flowing of the fluid induced by the later diffuser 250 in the second level can be made to stablize.As a result,
Energy conversion efficiency especially can be improved in the diffuser 250 after the second level, so as to improve multistage pump installation 10
Energy conversion efficiency.
2.4 Δ Xc ... (1) of Δ β w <
Under normal circumstances, diffuser 250 is not so that the flowing ingredient for the fluid being discharged from outlet side includes rotation as far as possible
The mode of velocity component designs diffuser alar part 280.Therefore, previous diffuser 250 has the wing angle of diffuser alar part 280
β w are more than 90 ° of part, and wing angle beta w is changed with larger variation delta β w.However, one will appreciate that:If wing angle beta w has big
In 90 ° of parts or with larger variation delta β w variations, then the fluid in diffuser 250 easy tos produce stripping, especially exists
Energy efficiency reduces in the later diffuser 250 in the second level.Therefore in the present embodiment, meet formula in all regions
(1) relationship, and diffuser wing angle beta w is made to become less than 90 ° of angle, and be designed as intentionally from diffuser 250
The fluid of outlet discharge leaves rotary speed ingredient.Thus, it is possible to inhibit the fluid in diffuser 250 to generate stripping, and can
The flowing of the fluid induced by the later diffuser 250 in the second level is set to stablize, so as to improve the energy of multistage pump installation 10
Transfer efficiency.
In addition, for diffuser 250, the maximum outside diameter φ Dc of flow path Fc that outside housing section 270 is divided with expand
The meridian plane chord degree Lc for dissipating the peripheral side of device alar part 280 meets the relationship of following formula (2).In addition, for diffuser 250,
The meridian plane chord of the maximum inner diameter φ Dh for the flow path Fc that inside housing section 260 is divided and the inner circumferential side of diffuser alar part 280
Degree Lh meets the relationship of following formula (3).Here, the peripheral side of diffuser alar part 280 and meridian plane chord degree Lc, Lh of inner circumferential side
It is the length in the region for being provided with diffuser alar part 280 at the meridian plane of housing section 270 and inside housing section 260 on the outside
(with reference to Fig. 2).In addition, for the meridian plane chord degree Lc, Lh, the meridian plane chord degree Lh of inner circumferential side becomes peripheral side
Meridian plane chord degree Lc or less (relationship for meeting following formula (4)).By relationship as satisfaction, so as to become the axis side Aw
To the shorter diffuser 250 of length can realize that small-sized and energy conversion efficiency is high by indicating the relationship of formula (1)
Multistage pump installation 10.
Lc/ φ Dc < 0.64 ... (2)
Lh/ φ Dh < 0.63 ... (3)
Lh≤Lc…(4)
In addition, for the peripheral surface of the meridian section of inside housing section 260, become positioned at the internal diameter than flow path Fc
The part of discharge side is leaned in the position of maximum (=φ Dh), and the maximum value θ o with angle formed by axis Aw are relative to than under fast Ns satisfactions
The relationship of formula (5).Here, rotary speed (the min- of (motor) will be pumped1) it is set as Np, by discharge rate (m3/ min) be set as Qp, will be total
Lift (m) is set as Hp, then is indicated with following formula (6) than fast Ns.By relationship as satisfaction, so as to become the directions axis Aw
The smaller diffuser 250 of length, by indicating the relationship of formula (1), so as to realize that small-sized and energy conversion efficiency is high
Multistage pump installation 10.In addition, in the present embodiment, the peripheral surface of inside housing section 260 is flowing out side end (on being in figure
Side end), become maximum (=θ o) (with reference to Fig. 2) with angle formed by axis Aw.But it is not limited to such example, inside shell
The peripheral surface in body portion 260 can also not be the place for flowing out side end, become maximum with angle formed by axis Aw.
θ o > 150ONs-0.6…(5)
Ns=(Np.Qp1/2)/Hp3/4…(6)
Fig. 4 is the figure of the efficiency curve for the impeller for indicating the discharge rate relative to multistage pump, and Fig. 5 is indicated relative to multistage
The figure of the efficiency curve of the diffuser of the discharge rate of pump.Here, the heavy line in Fig. 4 and Fig. 5 is above-mentioned for all meeting
The multistage pump installation 10 of the present embodiment of the relationship of formula (1)~(5) and first order impeller 240 and diffuser 250 are shown
Curve graph.In addition, the thick dashed line in figure be shown for the multistage pump installation 10 of present embodiment second level impeller 240 with
And the curve graph of diffuser 250.Fine line in figure is the comparative example for the relationship for being unsatisfactory for above-mentioned formula (1)~(5)
Multistage pump installation and the curve graph of first order impeller and diffuser is shown.In addition, the fine dotted line in figure is to be directed to comparative example
Multistage pump installation and the figure of second level impeller and diffuser is shown.As shown in Figure 4 and 5, multistage pump installation 10 is to incite somebody to action
Specific discharge rate makes efficiency become the angle that highest mode designs diffuser alar part 280 as specified Md.If moreover, row
Output is far from specified Md, then the angle of the flowing of fluid and diffuser alar part 280 mismatches and energy efficiency is made to reduce.
In general, diffuser 250 is overlapped multistage identical object, it is designed as with level-one for its energy conversion efficiency
The efficiency highest as object of diffuser 250.But in this case, as shown in the comparative example of Fig. 4 and Fig. 5, for first
Grade impeller and diffuser can realize higher energy conversion efficiency (with reference to the fine line in figure), but be directed to second level leaf
Wheel and diffuser, energy efficiency reduce (with reference to the fine dotted line in figure).This is because:Pass through first order impeller and diffuser
The flowing of fluid afterwards includes turbulent flow, and the turbulent flow of the fluid can influence the later impeller and diffuser in the second level.Especially exist
When the discharge rate of pump is larger, the fluid in diffuser, which generates, to be removed, and the reduction of the energy conversion efficiency of impeller and diffuser becomes
Significantly.In addition, the meridian plane of diffuser is shorter, i.e. the length in the directions axis Aw of diffuser is shorter, then the fluid in diffuser
Turbulent flow is more easy tod produce, to which the energy efficiency of the later impeller in the second level and diffuser reduces.
On the other hand, in the multistage pump installation 10 of present embodiment, to meet the relationship of above-mentioned formula (1)~(5)
Mode designs diffuser 250.As a result, as shown in the heavy line and dotted line in Fig. 4 and Fig. 5, the length in the directions axis Aw
In smaller diffuser 250, the energy conversion efficiency of second level impeller 240 and diffuser 250 can be improved.This is to be based on
Rotary speed ingredient is intentionally left from the fluid of the outlet discharge of diffuser 250.It is later by the second level thereby, it is possible to make
The flowing for the fluid that impeller 240 and diffuser 250 induce is stablized, and compared with the multistage pump installation of comparative example, can improve energy
Measure transfer efficiency.In addition, in the case where changing the series of diffuser 250 and impeller 240, the energy relative to discharge rate turns
Result identical with Fig. 4 and relationship shown in fig. 5 can be obtained by changing efficiency also.In addition, making diffuser 250 and impeller 240
Series become three-level or more in the case of, the efficiency curve of the later impeller 240 of the third level and diffuser 250 and Fig. 4 with
And second level efficiency curve shown in fig. 5 is identical (with reference to the thick dashed line in figure).
In the multistage pump installation 10 of present embodiment described above, the wing angle beta w phases of multiple diffuser alar parts 280
For the unit change amount Δ Xc (mm) of the meridian plane position of peripheral side or inner circumferential side, in all regions to meet formula
(1) the variation delta β w variations of relationship.In addition, the wing angle beta w of diffuser alar part 280 is formed as less than in all regions
90°.In the outlet fluid of diffuser 250, there are rotary speed ingredients as a result, and no matter how pump discharge can make each diffuser
250 outlet fluid stable can realize small-sized and high energy conversion efficiency multistage pump installation 10.
In addition, the maximum outside diameter φ Dc and maximum of the flow path that outside housing section 270 and inside housing section 260 are divided
Meridian plane chord degree Lc, Lh of the peripheral side and inner circumferential side of internal diameter φ Dh and diffuser alar part 280 meet formula (2)~(4)
Shown in relationship.In addition, angle θ o formed by the peripheral surface of the outflow side end of inside housing section 260 and axis Aw relative to than
Fast Ns meets the relationship of formula (5).But diffuser alar part 280 is not limited to such example, can also meet above-mentioned pass
Formula (2)~(5) is at least one in system.
In above-mentioned multistage pump installation 10, motor 100 is set to lower section, is provided with pumping section 200 above it, but also may be used
Motor 100 is arranged in the top of pumping section 200.In addition, pumping section 200 is not limited to longitudinal as shown in Figure 1, can also become horizontal
Deng.In addition, multistage pump installation 10 can use in water, can also be used in land.
In above-mentioned diffuser 250, between interior side body portion 260 and outside housing section 270, it is provided with 7 diffusions
Device alar part 280, but diffuser alar part 280 can also be 1~6 or 8 or more.
Above-mentioned diffuser 250 accommodates impeller 240, but can also have and accommodate impeller 240 with 250 split settings of diffuser
Shell.
Two level diffuser 250 and impeller 240, but diffuser 250 and impeller are provided in above-mentioned multistage pump installation 10
240 can also be provided with three-level or more.
More than, embodiments of the present invention are illustrated, but the embodiment of above-mentioned invention is to be easy to manage
The solution present invention, without limiting the invention.The present invention does not depart from its purport and can change, improve certainly, and
Include its equipollent in the present invention.In addition, in at least part of range that can solve above-mentioned project or playing effect
In at least part of range of fruit, the arbitrary combination of embodiment and variation can be carried out, right can be carried out and wanted
Ask the arbitrary combination or omission of each integral part recorded in book and specification.
This application claims preferential based on Japanese patent application No. filed in 29 days March in 2016 the 2016-066008th
Power.It is complete including the specification of Japanese patent application No. the 2016-066008th, claims, attached drawing and abstract
The disclosure in portion, the application by referring to and whole quote.Including Japanese Unexamined Patent Publication 6-323291 bulletins (patent document 1)
Specification, claims, whole disclosures including attached drawing and abstract, the application by referring to and whole quote.
Reference sign:10... multistage pump installation;100... motor;102... cable;104... drive shaft;
106... connector;108... shell;200... pumping section;210... suction casing;212... assembled portion;214... Screw;
216... suction inlet;218... assembled portion;220... shell is discharged;222... assembled portion;224... assembled portion;226... non-return
Valve;230... main shaft;240... impeller;250... diffuser;252... assembled portion;253... Screw;254... assembled portion;
255... Screw;258... grommet;260... inside housing section;268... bearing sleeve;270... outside housing section;
280... diffuser alar part;Aw... axis;β w... diffuser wing angles;Rd... circumferential tangent line;Cd... center line;
Fc... flow path;Xc... meridian plane position;φ Dc... maximum outside diameters;φ Dh... maximum inner diameters;Ns... than speed;Dh... maximum
Internal diameter φ.
Claims (7)
1. a kind of diffuser, be used for multistage pump, the diffuser by with the impeller rotated around rotary shaft it is concentric in a manner of configure, to companion
The fluid being induced with the rotation of the impeller guides, wherein the diffuser has:
Housing section, with the flow path of the model split cylindrical shape to attenuate from the inflow side of fluid towards outflow side diameter;With
Multiple diffuser alar parts, they are multiple in the flow arrangement of the cylindrical shape, and the flow path of the cylindrical shape is divided into spiral shell
Shape is revolved,
The multiple diffuser alar part at the arbitrary meridian plane position of the housing section, cut by the aerofoil of the diffuser alar part
Line direction and the circumferential angulation that is, diffuser wing angle beta w (°) relative to the rotary shaft, relative to the meridian
The unit change amount Δ Xc (mm) of face position, to meet:The variation delta β w variations of the relationship of 2.4 Δ Xc of Δ β w <,
The diffuser wing angle beta w is less than 90 ° in all areas.
2. diffuser according to claim 1, wherein
The meridian plane chord of the maximum outside diameter φ Dc for the flow path that the housing section is divided and the peripheral side of the diffuser alar part
Lc is spent to meet:The relationship of Lc/ φ Dc < 0.64.
3. diffuser according to claim 1 or 2, wherein
The meridian plane chord of the maximum inner diameter φ Dh for the flow path that the housing section is divided and the inner circumferential side of the diffuser alar part
Lh is spent to meet:The relationship of Lh/ φ Dh < 0.63.
4. the diffuser according to any one of claims 1 to 3, wherein
The meridian plane chord degree Lh of the inner circumferential side of the diffuser alar part is the meridian plane chord degree Lc or less of peripheral side.
5. the diffuser according to any one of Claims 1 to 4, wherein
By the rotary speed (min of pump-1) it is set as Np, by discharge rate (m3/ min) it is set as Qp, total (pumping) head (m) is set as to Hp, it is described
The wall surface of the inner circumferential side of the outflow side end of housing section becomes than the internal diameter of the flow path at maximum position downstream, with
The maximum value θ o (°) at angle formed by the rotary shaft are relative to Ns=(NpQp1/2)/Hp3/4Expression meets than speed Ns:
θ o > 1500Ns-0.6Relationship.
6. a kind of multistage pump installation, wherein have:
Diffuser described in any one of multistage Claims 1 to 5;With
The multistage impeller for being configured with concentric circles with the diffuser and inducing fluid to the diffuser.
7. multistage pump installation according to claim 6, wherein
Being also equipped with makes the power source of the impeller rotation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016-066008 | 2016-03-29 | ||
| JP2016066008A JP6712159B2 (en) | 2016-03-29 | 2016-03-29 | Diffuser and multi-stage pump device |
| PCT/JP2017/012812 WO2017170640A1 (en) | 2016-03-29 | 2017-03-29 | Diffuser and multistage pump |
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| Publication Number | Publication Date |
|---|---|
| CN108700078A true CN108700078A (en) | 2018-10-23 |
| CN108700078B CN108700078B (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780014161.8A Active CN108700078B (en) | 2016-03-29 | 2017-03-29 | Diffuser and multistage pump device |
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| Country | Link |
|---|---|
| JP (1) | JP6712159B2 (en) |
| CN (1) | CN108700078B (en) |
| BR (1) | BR112018069611B1 (en) |
| TW (1) | TWI716571B (en) |
| WO (1) | WO2017170640A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10760587B2 (en) * | 2017-06-06 | 2020-09-01 | Elliott Company | Extended sculpted twisted return channel vane arrangement |
| US11181123B2 (en) | 2019-03-22 | 2021-11-23 | Apergy Esp Systems, Llc | Downhole centrifugal pump diffuser with protuberant vanes |
| CN114688045B (en) * | 2020-12-25 | 2024-05-24 | 广东美的白色家电技术创新中心有限公司 | Fan assembly and dust collector |
| KR102573264B1 (en) * | 2021-05-24 | 2023-09-01 | 한국생산기술연구원 | Multi-stage centrifugal pump |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295652A (en) * | 1998-04-24 | 2001-05-16 | 株式会社荏原制作所 | Mixed flow pump |
| KR20130060778A (en) * | 2011-11-30 | 2013-06-10 | 에스티엑스중공업 주식회사 | Diffuser pump |
| CN103649458A (en) * | 2011-05-13 | 2014-03-19 | 贝克休斯公司 | Diffuser bump vane profile |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2762210B2 (en) * | 1993-05-17 | 1998-06-04 | 株式会社荏原製作所 | Multi-stage pump |
| CN103591051A (en) * | 2013-11-07 | 2014-02-19 | 江苏大学 | Space guide blade with auxiliary vanes |
-
2016
- 2016-03-29 JP JP2016066008A patent/JP6712159B2/en active Active
-
2017
- 2017-03-29 TW TW106110499A patent/TWI716571B/en active
- 2017-03-29 CN CN201780014161.8A patent/CN108700078B/en active Active
- 2017-03-29 BR BR112018069611-0A patent/BR112018069611B1/en active IP Right Grant
- 2017-03-29 WO PCT/JP2017/012812 patent/WO2017170640A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295652A (en) * | 1998-04-24 | 2001-05-16 | 株式会社荏原制作所 | Mixed flow pump |
| CN103649458A (en) * | 2011-05-13 | 2014-03-19 | 贝克休斯公司 | Diffuser bump vane profile |
| KR20130060778A (en) * | 2011-11-30 | 2013-06-10 | 에스티엑스중공업 주식회사 | Diffuser pump |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201738462A (en) | 2017-11-01 |
| WO2017170640A1 (en) | 2017-10-05 |
| TWI716571B (en) | 2021-01-21 |
| CN108700078B (en) | 2020-10-27 |
| JP2017180193A (en) | 2017-10-05 |
| BR112018069611B1 (en) | 2023-11-07 |
| BR112018069611A2 (en) | 2019-01-29 |
| JP6712159B2 (en) | 2020-06-17 |
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