CN104074800B - Centrifugal pump and its spiral case possessed - Google Patents
Centrifugal pump and its spiral case possessed Download PDFInfo
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- CN104074800B CN104074800B CN201410055855.4A CN201410055855A CN104074800B CN 104074800 B CN104074800 B CN 104074800B CN 201410055855 A CN201410055855 A CN 201410055855A CN 104074800 B CN104074800 B CN 104074800B
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- spiral case
- diffuser
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Abstract
The present invention provides a kind of centrifugal pump and its spiral case possessed, and it can not make efficiency reduce ground, easy application, repair inside spiral case in large-scale hydraulic.The centrifugal pump（20）Have：Rotary shaft（11）；Centrifugal impeller（8）, it is installed on the front end of the rotary shaft；Diffuser（5）, it configures the outside diameter in centrifugal impeller and is circumferentially configured with multiple blades across compartment of terrain；And spiral case（1）, it configures the outside diameter in the diffuser.Spiral case has the internal side diameter opening portion and two ring elements of configured in parallel for making the gradually circumferentially changing whirlpool type portion of sectional area and formation in whirlpool type portion（3a、3b）.The diameter of the inner-diameter end of ring element is more than or equal to the diameter at the external diameter end of the blade of diffuser.
Description
Technical field
The present invention relates to centrifugal pump and its spiral case possessed, more particularly to spray pressure for high pressure it is large-scale it is vertical from
Heart pump and its spiral case possessed.
Background technology
The example of spiral case used in conventional large-scale hydraulic is recorded in patent document 1 and 2, non-patent literature 1.Its
In, in the spiral case described in patent document 1, intensity face is considered when the hydraulic turbine is operated, and seek reduction to be led based on fixation
Collision loss at the discharge loss of the influence of the wake flow of leaf outlet and guide vane.Specifically, hydraulic have can
The roller of rotation, the outside of roller circumferentially each other across compartment of terrain arrange movable guide vane, in guide vane
Outside circumferentially each other across compartment of terrain arrange fixed guide vane and configuration the outside of fixed guide vane spiral case.Fixation is led
The upper and lower side of leaf is fixed on the upper retainer ring and lower retainer ring of ring-type, the wall thickness of the inner peripheral side end portion of fixed guide vane be formed as with
Upper and lower end parts are relatively thin compared to central portion.
In addition in patent document 2, following technology is disclosed, i.e. in the hydraulic turbine or turbine, even if supporting is solid
The prominent length to housing for determining the mainboard of stator further shortens, and can also seek relative to the external force produced in operation
Maintain sufficient intensity.Specifically, fixed guide vane is divided into long wing fixed guide vane and short limb fixed guide vane, the long wing is fixed
Stator is alternately in turn secured to mainboard with short limb fixed guide vane, is formed with the speed ring of hydraulic.
In addition, in non-patent literature, record in the pump of vertical centrifugal whirlpool type spiral case by a wide range of welding structure Lai
Formed.Also, repair for convenience, although be Large Copacity, but need to be set to completely reveal indoors, housing is led with fixation
Leaf can be fastened by bolts and be decomposed.In addition, as the Fig. 3 is recorded in detail, being directed to device（Diffuser）With
Housing is split, and the outermost path position of retainer ring reaches the inlet portion of spiral case.
Citation
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2005-140078 publications
Patent document 2：Japanese Unexamined Patent Publication 2002-138939 publications
Non-patent literature
Non-patent literature 1：Vancomycin resistance Yin Huang project team, " towards the pumping unit of Shanxi Province, China/Vancomycin resistance project ", Jiang Yuan
Daily paper, No.195, in April, 2002, the right column of page 71
In the hydraulic described in any one of above-mentioned patent document 1,2 and non-patent literature 1, in hydraulic
Spiral case and the connecting portion of diffuser, i.e. narrow at want can overcome by operating fluid force and centrifugal force generation
, make the spiral case to the power axially expanded, that is to say, that provided with fixed guide vane.Its result is it is recognized that while spiral case can be prevented
To the extension of axial direction, but the open side of spiral case in the root as fixed guide vane, the connecting portion side i.e. with diffuser, produce and answer
Power is concentrated.
In order to avoid the stress concentration, by increasing the sectional area of fixed guide vane or to the greatest extent may be used in the shape of volute section
It is not provided with corner to be tackled energy.However, when increasing the sectional area of fixed guide vane, in the repairing for spiral case and dimension
When protecting and carrying out application or repairing to the inner peripheral surface of spiral case, operation substantially becomes difficult.At the same time, cutting when fixed guide vane
The possibility of movement disorder is higher when area increases, the efficiency reduction of hydraulic when movement disorder.Equally, water engineer is maintained
The efficiency of the tool and cross sectional shape for changing spiral case is also difficult.
The content of the invention
The present invention be in view of the unfavorable condition of above-mentioned conventional art and make, it is intended that in large-scale water engineer
Do not reduce efficiency in tool and can easily application, inside repairing spiral case.In addition, its purpose is lain also in, in the operating of hydraulic
When, it is to avoid the excessive stress concentration easily produced in the connecting portion of housing and diffuser.
As the feature of the invention for reaching above-mentioned purpose, centrifugal pump has：Rotary shaft；Centrifugal impeller, it is installed on this
The front end of rotary shaft；Diffuser, it configures the outside diameter in the centrifugal impeller and is circumferentially configured with multiple across compartment of terrain
Blade；And spiral case, it configures the outside diameter in the diffuser, and the spiral case, which has, makes the gradually circumferentially changing whirlpool of sectional area
The internal side diameter opening portion and two ring elements of configured in parallel, the internal diameter of the ring element of type portion and formation in the whirlpool type portion
The diameter at end is more than or equal to the diameter at the external diameter end of the blade of the diffuser.
Also, under this feature, in the diffuser, the side plate of ring-type is configured with the two sides of the blade,
Two ring elements of the spiral case are provided with to the ring element and the side plate with the respective rear side of biside plate of the diffuser
The lid fastened, can be fastened the lid, the ring element with the side plate by fastening member, can also be by institute
State rotation shaft vertical to set, working fluid is sucked from below, in the rear side and the lid of a side of the core of the impeller
Inner surface side configuration protection plate.
As other features of the invention for reaching above-mentioned purpose, a kind of spiral case, it is possessed by centrifugal pump, and can be
Internal side diameter houses the diffuser for possessing many pieces of blades, and the spiral case has the gradually circumferentially changing whirlpool type portion of sectional area and formation
Internal side diameter opening portion and two ring elements of configured in parallel in the whirlpool type portion, institute is compared in the position of the inner-diameter end of the ring element
Internal side diameter is leaned in the position for stating the external diameter end of the blade of diffuser.
Also, under this feature, the whirlpool type portion can form multiple shells to thin plate steel plate progress bending machining
After the component of construction, to the component of multiple shell structures that is formed by the bending machining and the ring and the multiple component that
This is welded and integrally-formed, by casting the whirlpool type portion can also be made integrated with the ring portion.
According to the present invention, in large-scale centrifugal pump, it is allowed to which the connecting portion of spiral case and diffusion part is in operation vertically
Expand, eliminate the link position set fixed guide vane the step of, therefore safeguard, repair in operator can easily from into
Enter for the connecting portion of narrow inside centrifugal pump.Thus, application, repairing work become easy.Further, since in connecting portion not
There is fixed guide vane, therefore fluid will not be collided with fixed guide vane when pump is operated, also reduction friction, is being able to maintain that pump
Efficiency while, can also avoid excessive stress concentration.
Brief description of the drawings
Fig. 1 is the sectional elevation of an embodiment of the pump for possessing spiral case involved in the present invention.
Fig. 2 is the top view for the volute section that the pump shown in Fig. 1 has.
Fig. 3 is Fig. 2 A-A regarding sectional views.
Description of reference numerals
1 ... spiral case, 1i... shell plates（Shell structure component）, 2 ... whirlpool type portions, the upper rings of 3a ..., the lower rings of 3b ..., 5 ... diffusers,
5a ... diffuser epipleurals, 5b ... diffuser lower side panels, 5c ... blades, 6 ... fastening bolts, 7a ... is above covered, 7b ... lower covers, 8 ...
Impeller, 8a ... cores, 8b ... side plates, 8c ... blades, 9 ... protection boards, 11 ... rotary shafts, 12 ... ejiction openings, 13 ... suction lines,
14 ... seals, 15 ... bearings, 16 ... basic courses departments, 20 ... vertical centrifugal pumps
Embodiment
Hereinafter, an embodiment of the vertical centrifugal pump of the present invention is illustrated with Fig. 1~Fig. 3.Fig. 1 is the vertical of the present invention
The longitudinal section of centrifugal pump 20, Fig. 2 is the top view for the spiral case 1 that the vertical centrifugal pump 20 has, Fig. 3 be Fig. 2 A-A to regarding
Sectional view.
In the bottom of the rotary shaft 11 configured vertically, impeller 8 is fixed with using impeller nut 8d.Impeller 8 is that possess use
In the core 8a and side plate 8b of the both sides for the multiple blade 8c for keeping along the circumferential direction configuring at substantially equal intervals centrifugation
Impeller.In the case where working fluid largely contains sandstone, in order to prevent by the inner walls of sandstone abrasion centrifugal pump 20,
The rear side of the impeller 8（It is upside in Fig. 1）Provided with the protection board 9 as the part that is worn.The protection board 9 uses stainless steel
Material etc..The diffuser 5 of explained later is configured with the downstream of impeller 8, i.e. outside diameter, in the further external diameter of the diffuser 5
Side, is configured with section for circular and the gradually circumferentially changing spiral case 1 of sectional area.
In the pars intermedia and the rear side of impeller 8 of rotary shaft 11（It is upside in Fig. 1）Sealing mechanism 14 is configured with, is used for
Prevent the fluid flowed out from impeller 8 from being flowed into the rear side of impeller 8.In the top of sealing mechanism 14, it is configured with the centrifugal pump
20 Bearning mechanisms 15 rotatably supported.
In the vertical centrifugal pump 20 so constituted, the water sucked from the suction line 13 of the lower section positioned at impeller 8, in peace
In the presence of the rotation N of the impeller 8 of leading section loaded on the rotary shaft 11 being connected with prime mover (not shown), boosted and flowed
Enter to diffuser 5.Diffuser 5 has the multiple blade 5c circumferentially configured at substantially equal intervals and clips the plurality of blade 5c
Both sides diffuser epipleural 5a and diffuser lower side panel 5b.The kinergety of fluid is converted in diffuser 5
Pressure energy, working fluid is further boosted.Flow into and be pooled to circumferentially gradually by the fluid between each diffuser vane 5c
Increase the spiral case 1 of sectional area, sprayed from ejiction opening 12 to outside.
Here, the centrifugal pump 20 of the present embodiment, which is the bore of such as ejiction opening 12, reaches 1000~2000mm centrifugal pump,
H-Max also reaches 150~250m.Due to the mammoth pump 20 as, therefore spiral case 1 turns into tank processed construction as much as possible.
But, casting construction is not excluded.Also, the housing of the pump 20 comprising spiral case 1 is supported in lower surface by supporting member 7b
The basic courses department 16 formed by concrete etc..
Lift as described above is higher, flow is also in larger centrifugal pump 20, and the fluid force in operating also increases.Its result
It is that particularly produced at the export department of the diffuser 5 as high pressure, the inlet portion of spiral case 1 makes diffusion using great pressure
The power that device 5 and spiral case 1 to axial direction, i.e. Fig. 1 above-below direction extend.The Leaf 5c of diffuser 5 resist the diffuser 5 to be made,
The power that spiral case 1 extends.
On the other hand, in spiral case 1, in the past in order to resist the power to be extended and by fixed guide vane and diffuser vane 5c
It is likewise arranged on circumferential multiple positions.However, when setting fixed guide vane, though it can prevent the opening portion of spiral case 1 from expanding,
Stress concentration is produced in the facial installation portion to spiral case 1 in both sides of fixed guide vane.
In order to eliminate the antinomy, the act of the opening portion of the present inventor's numerical experiment Journal of Sex Research spiral case 1 in operation
Dynamic, its result obtains following opinion.That is, even if driving eliminates the centrifugal pump 20 of fixed guide vane, do not occur conventional institute yet
The opening portion of the spiral case 1 of worry degree it is axially enlarged, only hundreds of μm or so, in the situation more than spray diameter 1000mm
Under, had little to no effect in practicality.In addition, removing the result of fixed guide vane, excessive stress will not occur at spiral case 1
Concentrate.
Fixed guide vane is omitted as described above, turns into the inner surface of the housing 1 of the stream of working fluid in progress
Application, maintenance when repairing, again application when, can avoid fixed guide vane cause hinder and reparation construction is become as difficulty
The state of affairs.In addition, can also avoid due to fixed guide vane and when pump 20 is operated the collision loss of working fluid, rub
Mistake of wearing increases and the such state of affairs of efficiency reduction.
Illustrate the details of the spiral case 1 involved by the present embodiment as characterized above below.The spiral case 1 illustrated below
Made by tank method processed.Spiral case 1 by punching press etc. by will make sheet steel plate shape turn into the shell plates 1 of frustoconical shapeiSuccessively
Change its diameter and form multiple, to each shell plates 1i（I=1, n）Between welded, so as to be formed as whirlpool type shape.Need
It is bright, each shell plates 1iParallel notch part is formed in part with suitable with the inner circumferential side of whirlpool type, above and below the notch part
As shown in detail in fig. 3, welded with upper ring 3a and lower ring 3b peripheral end at two ends.As a result, the cross sectional shape of spiral case 1 is presented
For in circular shell plates 1iThe parallel two pieces of plates in the inner circumferential side flask shape that is vertically connected with and extends to internal side diameter.
In the case where the internal side diameter of the spiral case 1 is almost seamlessly fitted together to and has a diffuser epipleural 5a and diffuser by ring-type
Side plate 5b keeps the blade 5c of multiple wing-like both sides（It is upper and lower end parts in figure 3）Diffuser 5.Also, in order to
Diffuser 5 is positioningly maintained on spiral case 1 in the vertical direction, upper lid 7a and lower cover 7b is linked into diffuser 5 and spiral case 1.
Number important place uses multiple bolts in the link（Fastening member）6, the working fluid produced when centrifugal pump 1 is operated can be born
Pressure.
Here, as shown in figure 3, spiral case has the upper ring 3a and lower ring 3b that extend to internal side diameter, thus from above-mentioned ring 3a,
To the radius flow portion between the whirlpool type flow path portion formed by shell structure component 2 below 3b inner circumferential end, i.e. diffuser exit
In δ interval, in the absence of the component for hindering stream.
Therefore, it is possible to because being pressed in axial direction in produced by the work of centrifugal pump 20（It is above-below direction in figure 3）On make
Expand between ring 3a, 3b, but the extensive magnitude is not have any problem in hundreds of μm, practicality at most as described above.Especially exist
It is not present in the radius flow path portion and hinders the conventional fixed guide vane used of flowing is such to hinder, therefore damages the collision of flowing
Lose and friction loss is reliably reduced, improve the efficiency of centrifugal pump 20.In addition, fixed blade is being installed on into diffuser or ring
When, it can exclude and be concentrated in the excessive stresses produced by the root of fixed guide vane.
In addition, by the way that diffuser 5 is separately provided with spiral case 1, application, inspection in the shell plates 1a of spiral case 1 inner surface
Repairing when repairing, again application when, can avoid the blade 5a of diffuser 5, fixed guide vane turn into hinder and make reparation construction it is difficult,
Or limit the problem of reparation construction method is such.That is, the pump of the present embodiment is as described above because spray diameter is larger, therefore upper
State in painting operation or repairing work, if operator can enter in shell plates 1a, workability is greatly improved.In the present embodiment
Pump in, diffuser is separately provided, therefore, it is possible in the state of diffuser 5 has been dismantled individually application and repairing spiral case 1.Separately
Outside, the radial direction flow portion of spiral case is opened, therefore the operation of application, repairing will not be counteracted.In addition, by making housing
1 shell plates 1a overall deformations, can disperse to undertake the load that internal pressure is brought, it is to avoid stress concentration.
It should be noted that in the above-described embodiments, illustrated in case of the housing that tank processed is constructed, but casting
The housing of construction can also be applicable the present invention.When being set to casting construction, the shape of spiral case can be set to more regular whirlpool type
Shape.
Claims (2)
1. a kind of centrifugal pump, it is characterised in that
The centrifugal pump has：
Rotary shaft；
Centrifugal impeller, it is installed on the front end of the rotary shaft；
Diffuser, it configures the outside diameter in the centrifugal impeller and is circumferentially configured with multiple blades across compartment of terrain；And
Spiral case, it configures the outside diameter in the diffuser,
The spiral case, which has, beats the gradually circumferentially changing whirlpool type portion of sectional area and the internal side diameter formed in the whirlpool type portion
Two ring elements of portion and configured in parallel are opened,
The diameter of the inner-diameter end of the ring element is more than or equal to the diameter at the external diameter end of the blade of the diffuser,
In the diffuser, the side plate of ring-type is configured with the two sides of the blade, the spiral case two ring elements with
The respective rear side of biside plate of the diffuser is provided with the lid fastened to the ring element and the side plate, will be described
Lid, the ring element are fastened with the side plate by fastening member.
2. centrifugal pump according to claim 1, it is characterised in that
The rotation shaft vertical is set, working fluid is sucked from below, guarantor is configured with the rear side of the core of the impeller
Backplate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013068404A JP6055706B2 (en) | 2013-03-28 | 2013-03-28 | Centrifugal pump |
| JP2013-068404 | 2013-03-28 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104074800A CN104074800A (en) | 2014-10-01 |
| CN104074800B true CN104074800B (en) | 2017-07-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410055855.4A Active CN104074800B (en) | 2013-03-28 | 2014-02-19 | Centrifugal pump and its spiral case possessed |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6055706B2 (en) |
| CN (1) | CN104074800B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018003635A1 (en) | 2016-07-01 | 2018-01-04 | 株式会社Ihi | Centrifugal compressor |
| CN114135490B (en) * | 2021-12-20 | 2024-01-19 | 沈阳鼓风机集团核电泵业有限公司 | Centrifugal pump |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147042U (en) * | 1974-05-24 | 1975-12-05 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH578686A5 (en) * | 1974-10-03 | 1976-08-13 | Charmilles Sa Ateliers | |
| JPH03260399A (en) * | 1990-03-07 | 1991-11-20 | Union Carbide Ind Gases Technol Corp | Centrifugal compressor having hybrid diffuser and swirl chamber adapted for overdiffusion of cross sectional area |
| JP3975501B2 (en) * | 1997-03-17 | 2007-09-12 | 株式会社Ｉｈｉ | Centrifugal compressor |
| TW368563B (en) * | 1998-04-10 | 1999-09-01 | Ind Tech Res Inst | Sheeting pump shell structure and manufacturing method thereof |
| JP4115202B2 (en) * | 2002-08-08 | 2008-07-09 | 三菱重工業株式会社 | Pump water wheel |
| GB0313143D0 (en) * | 2003-06-07 | 2003-07-09 | Boc Group Plc | Sewage aeration |
| US6988870B2 (en) * | 2004-01-27 | 2006-01-24 | Weir Slurry Group, Inc. | Casing for a centrifugal pump |
-
2013
- 2013-03-28 JP JP2013068404A patent/JP6055706B2/en active Active
-
2014
- 2014-02-19 CN CN201410055855.4A patent/CN104074800B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50147042U (en) * | 1974-05-24 | 1975-12-05 |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2014190301A (en) | 2014-10-06 |
| JP6055706B2 (en) | 2016-12-27 |
| CN104074800A (en) | 2014-10-01 |
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Effective date of registration: 20200227 Address after: Tokyo, Japan Patentee after: Hitachi Industrial Machinery Co., Ltd Address before: Tokyo, Japan Patentee before: Hitachi, Ltd. |
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