CN107299914A - A kind of new submersible sewage pump double volute pump body and design method - Google Patents
A kind of new submersible sewage pump double volute pump body and design method Download PDFInfo
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- CN107299914A CN107299914A CN201710366582.9A CN201710366582A CN107299914A CN 107299914 A CN107299914 A CN 107299914A CN 201710366582 A CN201710366582 A CN 201710366582A CN 107299914 A CN107299914 A CN 107299914A
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention proposes a kind of new submersible sewage pump double volute pump body and design method, on the one hand its structure is improved on the basis of existing double volute, dividing plate is divided into two parts for being symmetrical with spiral case symmetrical plane, and dividing plate afterbody thickness is designed, on the other hand sufficiently consider easy produced problem in the working environment of submersible sewage pump, the particularity and practice for its work and substantial amounts of optimization has been done to design formula.The present invention can improve the conveying capacity of spiral case, it is to avoid cause obstruction, reduce the vortex that dividing plate end and spiral case diffuser occur, and direct impact of the reduction pumped (conveying) medium to dividing plate improves the efficiency of pump and life-span.
Description
Technical field
The present invention relates to a kind of pump shell structure of centrifugal pump and design method, more particularly to a kind of new submersible sewage pump double volute
The pump housing and design method.
Background technology
Submerged sewage pump is mainly for delivery of with solid particle and various long stapled waste water, city domestic sewage and rain
Water etc., highly important status is occupied in social production, life.For the larger submersible sewage pump of flow, people's generally handle
The pumping chamber of pump is designed to the form of double volute, so can effectively reduce the radial load produced during pump operation, reduction
The vibrations of pump operationally.The negative effect so designed is that spiral case section diminishes, and easily causes flow blockage.If dividing plate is set
Meter is unreasonable, can make on the outside of dividing plate end and hydraulic loss increase in larger vortex, spiral case often occurs in spiral case diffuser,
The lift of pump, efficiency is caused to reduce；If pumped (conveying) medium includes larger granular substance, spiral case especially cut water can be also caused
The obstruction at position, this is likely to result in the complete cisco unity malfunction of submersible sewage pump, and detrimental effect is brought to normal production.At present latent
In dirty pump using extensive double volute pumping chamber have for for the use of structure, the Hydraulic Design, still it is many can be with improved place.
The content of the invention
In order to overcome problems of the prior art, the present invention proposes a kind of new submersible sewage pump double volute pump body and set
Meter method, has on the one hand been improved dividing plate being divided into its structure on the basis of existing double volute and is symmetrical with spiral case and symmetrically puts down
Two parts in face, and dividing plate afterbody thickness is designed, the working environment of submersible sewage pump is on the other hand sufficiently considered,
Easy produced problem has done substantial amounts of optimization to design formula in particularity and practice for its work.The present invention can be carried
The conveying capacity of high spiral case, it is to avoid cause obstruction, reduces the vortex that dividing plate end and spiral case diffuser occur, and reduction conveying is situated between
The direct impact of confrontation dividing plate, improves the efficiency of pump and life-span.
Realizing the technical scheme that above-mentioned purpose is used is：
A kind of new submersible sewage pump double volute pump body and design method, it is characterised in that：The double volute pump body includes the pump housing,
Dividing plate I~II；The symmetrical plane that the dividing plate I and dividing plate II are symmetrical with the pump housing is fixed in the pump housing, between dividing plate I and dividing plate II
Flow clearance is left, the pump housing is divided into interior volute casing and outer volute casing two parts by dividing plate I~II；The wall thickness of the dividing plate I~II is by the 8th
Section starts to be gradually decrease to minimum thickness；
(1) the calculation of design parameters formula of double volute pump body is as follows：
1)D3=k1D2；
2)b3=(1.8-2.4) b2；
3)The higher n of specific speed of pumps,Value is bigger；
4)
5)α1=α0=α3；
6)
As the specific speed n of pumpsWhen≤200：
Cv=1.1734ns -0.235
As 200≤n of specific speed of pumpsWhen≤600：
Cv=0.5065ns -0.075
7)
8)
Sectional area coefficient CFValue as the following formula：
CF=-0.0032ns+1.523
9) as i≤4, Ai=Fi, as i >=5, Ai=Fi-Bi；
10) as i≤4, Bi=0, as i >=5, Bi=k3Ai-4；
In formula：D3- volute casing base circle diameter (BCD), m；
k1- basic circle design ratio, generally takes 1.05-1.1；
D2- impeller outer diameter, m；
b3- volute chamber entrance width, m；
b2- impeller outlet width, m；
- the first cut water laying angle, degree；
- the second cut water laying angle, degree；
α0- the first cut water helical angle, degree；
α1- the second cut water helical angle, degree；
α'3- impeller outlet fluid flow angle, degree；
V-volute casing section average speed, m/s；
k2- speed designs coefficient, span 0.85-0.95；
Cv- speed correction factor；
G-acceleration of gravity, m/s2；
The lift of H-pump, m；
Fi- the i-th cross-sectional area, m3；
φi- cornerite, the angle of the 0th section to the i-th section；
F8- the 8 cross-sectional area, m3；
CF- sectional area coefficient；
The volume flow of Q-pump, m3/s；
Ai- interior the cross-sectional area of volute casing i-th, m3；
Bi- outer the cross-sectional area of volute casing i-th, m3；
k3- volute casing area coefficient, k3Span 0.85-1；
(2) minimum thickness of dividing plate I~II is d, and d is calculated by below equation：
In formula：D-dividing plate minimum thickness, mm；
H-lift, m；
D-impeller outer diameter, m；
k4- block board thickness design ratio, value between taking 3-15；
ns- pump specific angular speed.
(3) speed designs coefficient k2Span be 0.85-0.95, when in pumped (conveying) medium include compared with multifilament when, k2
Get the small value, otherwise take large values；
(4) it is preferred that volute casing area coefficient k3It is calculated as follows：
k3=-0.034i+1.17
In formula：k3- volute casing area coefficient；
I-volute chamber section label；
(5) preferably, block board thickness design ratio k4It is calculated as follows and obtains：
As the specific speed n of pumpsWhen≤90,
k4=0.022ns+1.84
As 90≤n of specific speed of pumpsWhen≤280,
k4=0.023ns+1.75
In formula：k4- block board thickness design ratio,
nsThe specific speed of-pump；
Flow clearance between the fuisw rib I and fuisw rib II is L, and L is equal to submersible sewage pump maximum and passes through particle diameter
1.1-1.3 times, taken large values when including compared with multifilament in pumped (conveying) medium；
Beneficial effects of the present invention are：
A kind of new submersible sewage pump double volute pump body proposed by the present invention and design method, on the one hand pass through the structure to dividing plate
Design, sets flow clearance to avoid flow blockage, while reducing impact of the pumped (conveying) medium to dividing plate between dividing plate；Separately
On the one hand easy produced problem pair in the working environment of submersible sewage pump, the particularity and practice for its work is substantially envisaged
Design formula has done substantial amounts of optimization, and volute casing area of section and dividing plate afterbody are designed, the ability of the pumped (conveying) medium of spiral case is improved,
Avoid dividing plate end and spiral case diffuser from vortex occur, reduce the hydraulic loss in flow process, improve the efficiency of pump and life-span.
Brief description of the drawings
Fig. 1 show the profile of an example of the present invention；
Fig. 2 show Section A-A in Fig. 1 of the present invention；
Fig. 3 show Fig. 1 waterpower figure；
Description of reference numerals：
The 1- pump housings, 2- dividing plates I, 3- dividing plates II, 4- inner spiral casings, 5- outer spiral casings, the 6-the first cut water, the 7-the second cut water.
Embodiment
Fig. 1 show the profile of a specific embodiment of the invention, as illustrated, the double volute pump body includes the pump housing 1,
Dividing plate 2~3.Dividing plate 2 and dividing plate 3 are symmetrical with the symmetrical plane of the pump housing 1 and are fixed in the pump housing 1, are left between dividing plate 2 and dividing plate 3
Flow clearance, 1 point by the pump housing of dividing plate 2~3 is interior volute casing 4 and the two parts of outer volute casing 5；In order to avoid dividing plate end and spiral case spread
There is vortex in section, and the wall thickness of dividing plate 2~3 is gradually decrease to minimum thickness by the 8th section；When carrying out the Hydraulic Design,
First cut water is symmetrical arranged with the second cut water, the calculation of design parameters formula of the double volute pump body is as follows：
(1) volute casing base circle diameter (BCD) D3=k1D2, k1Value between generally taking 1.05-1.1；
(2) volute chamber entrance width b3=(1.8-2.4) b2；
(3) first cut water laying anglesThe higher n of specific speed of pumps,Value is bigger；
(4) second cut water laying angles
(5) cut water pitch angle alpha1=α0=α3；
(6) volute casing section average speed
As the specific speed n of pumpsWhen≤200：
Cv=1.1734ns -0.235
As 200≤n of specific speed of pumpsWhen≤600：
Cv=0.5065ns -0.075
Speed designs coefficient k2Span be 0.85-0.95, when in pumped (conveying) medium include compared with multifilament when, k2Take small
Value, on the contrary take large values；
(7) cross-sectional area of volute chamber i-th
(8) cross-sectional area of volute chamber the 8th
Sectional area coefficient CFValue as the following formula：
CF=-0.0032ns+1.523；
(9) as i≤4, Ai=Fi, as i >=5, Ai=Fi-Bi；
(10) as i≤4, Bi=0, as i >=5, Bi=k3Ai-4,
Volute casing area coefficient k3It is calculated as follows：
k3=-0.034i+1.17
(11) minimum thickness of dividing plate I~II (2~3) is d, and d is calculated by below equation：
Block board thickness design ratio k4It is calculated as follows and obtains：
As the specific speed n of pumpsWhen≤90,
k4=0.022ns+1.84
As 90≤n of specific speed of pumpsWhen≤280,
k4=0.023ns+1.75
In formula：D3- volute casing base circle diameter (BCD), m；
k1- basic circle design ratio, generally takes 1.05-1.1；
D2- impeller outer diameter, m；
b3- volute chamber entrance width, m；
b2- impeller outlet width, m；
- the first cut water laying angle, degree；
- the second cut water laying angle, degree；
α0- the first cut water helical angle, degree；
α1- the second every spiral shell tongue swing angle, degree；
α'3- impeller outlet fluid flow angle, degree；
V-volute casing section average speed, m/s；
k2- speed designs coefficient, span 0.85-0.95；
Cv- speed correction factor；
G-acceleration of gravity, m/s2；
The lift of H-pump, m；
Fi- the i-th cross-sectional area, m3；
nsThe specific speed of-pump；
I-volute chamber section label.
φi- cornerite, the angle of the 0th section to the i-th section；
F8- the 8 cross-sectional area, m3；
CF- sectional area coefficient；
The volume flow of Q-pump, m3/s；
Ai- interior the cross-sectional area of volute casing i-th, m3；
Bi- outer the cross-sectional area of volute casing i-th, m3；
k3- volute casing area coefficient；
D-dividing plate minimum thickness, mm；
H-lift, m；
D-impeller outer diameter, m；
k4- block board thickness design ratio；
(12) flow clearance between fuisw rib 2 and fuisw rib 3 is L, and L is equal to submersible sewage pump maximum and passes through particle diameter
1.1-1.3 times, taken large values when including compared with multifilament in pumped (conveying) medium.
Claims (6)
1. there is provided a kind of novel double volute pump body for submersible sewage pump for a kind of new submersible sewage pump double volute pump body and design method
And its design method, it is characterised in that：The double volute pump body includes the pump housing (1), dividing plate I~II (2~3)；The dividing plate I
(2) it is symmetrical with the symmetrical plane of the pump housing (1) with dividing plate II (3) and is fixed in the pump housing (1), between dividing plate I (2) and dividing plate II (3)
Flow clearance is left, the pump housing (1) is divided into interior volute casing (4) and outer volute casing (5) two parts by dividing plate I~II (2~3)；The dividing plate I
The wall thickness of~II (2~3) is gradually decrease to minimum thickness by the 8th section；The calculation of design parameters of the double volute pump body
Formula is as follows：
1)D3=k1D2；
2)b3=(1.8-2.4) b2；
3)The higher n of specific speed of pumps,Value is bigger；
4)
5)α1=α0=α3；
6)
As the specific speed n of pumpsWhen≤200：
Cv=1.1734ns -0.235
As 200≤n of specific speed of pumpsWhen≤600：
Cv=0.5065ns -0.075
7)
8)
Sectional area coefficient CFValue as the following formula：
CF=-0.0032ns+1.523
9) as i≤4, Ai=Fi, as i >=5, Ai=Fi-Bi；
10) as i≤4, Bi=0, as i >=5, Bi=k3Ai-4；
In formula：D3- volute casing base circle diameter (BCD), m；
k1- basic circle design ratio, generally takes 1.05-1.1；
D2- impeller outer diameter, m；
b3- volute chamber entrance width, m；
b2- impeller outlet width, m；
- the first cut water laying angle, degree；
- the second cut water laying angle, degree；
α0- the first cut water helical angle, degree；
α1- the second cut water helical angle, degree；
α'3- impeller outlet fluid flow angle, degree；
V-volute casing section average speed, m/s；
k2- speed designs coefficient, span 0.85-0.95；
Cv- speed correction factor；
G-acceleration of gravity, m/s2；
The lift of H-pump, m；
Fi- the i-th cross-sectional area, m3；
φi- cornerite, the angle of the 0th section to the i-th section；
F8- the 8 cross-sectional area, m3；
CF- sectional area coefficient；
The volume flow of Q-pump, m3/s；
Ai- interior the cross-sectional area of volute casing (4) i-th, m3；
Bi- outer the cross-sectional area of volute casing (5) i-th, m3；
k3- volute casing area coefficient, k3Span 0.85-1.
2. a kind of new submersible sewage pump double volute pump body according to claim 1 and design method, it is characterised in that：It is described every
The minimum thickness of plate I~II (2~3) is d, and d is calculated by below equation：
In formula：D-dividing plate minimum thickness, mm；
H-lift, m；
D-impeller outer diameter, m；
k4- block board thickness design ratio, value between taking 3-15；
nsThe specific speed of-pump.
3. a kind of new submersible sewage pump double volute pump body according to claim 1 and design method, it is characterised in that：The speed
Spend design ratio k2Span be 0.85-0.95, when in pumped (conveying) medium include compared with multifilament when, k2Get the small value, otherwise take
Big value.
4. a kind of new submersible sewage pump double volute pump body according to claim 2 and design method, it is characterised in that：Volute casing face
Product coefficient k3It is calculated as follows：
k3=-0.034i+1.17
In formula：k3- volute casing area coefficient；
I-volute chamber section label.
5. a kind of new submersible sewage pump double volute pump body according to claim 2 and design method, it is characterised in that：Dividing plate is thick
Spend design ratio k4It is calculated as follows and obtains：
As the specific speed n of pumpsWhen≤90,
k4=0.022ns+1.84
As 90≤n of specific speed of pumpsWhen≤280,
k4=0.023ns+1.75
In formula：k4- block board thickness design ratio；
nsThe specific speed of-pump.
6. a kind of new submersible sewage pump double volute pump body according to claim 1 and design method, it is characterised in that：It is described to lead
It is L to flow the flow clearance between muscle I (2) and fuisw rib II (3), and L is equal to submersible sewage pump maximum and passes through 1.1-the 1.3 of particle diameter
Times, taken large values when being included in pumped (conveying) medium compared with multifilament.
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|---|---|---|---|
| CN201710366582.9A CN107299914B (en) | 2017-05-23 | 2017-05-23 | A kind of submersible sewage pump double volute pump body and design method |
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| CN107299914B CN107299914B (en) | 2019-05-24 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108331763A (en) * | 2018-02-27 | 2018-07-27 | 中交疏浚技术装备国家工程研究中心有限公司 | A kind of design implementation method for the durable type dredge pump improving service life |
| CN110966245A (en) * | 2019-12-18 | 2020-04-07 | 珠海格力电器股份有限公司 | Pump body structure for reducing hydraulic excitation and centrifugal pump |
| CN115013221A (en) * | 2022-06-28 | 2022-09-06 | 武汉大学 | Water guide and diversion component of ultra-high-head and ultra-large-capacity water turbine and hydraulic design method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108331763A (en) * | 2018-02-27 | 2018-07-27 | 中交疏浚技术装备国家工程研究中心有限公司 | A kind of design implementation method for the durable type dredge pump improving service life |
| CN108331763B (en) * | 2018-02-27 | 2024-04-05 | 中交疏浚技术装备国家工程研究中心有限公司 | Design realization method of durable mud pump with prolonged service life |
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| CN115013221A (en) * | 2022-06-28 | 2022-09-06 | 武汉大学 | Water guide and diversion component of ultra-high-head and ultra-large-capacity water turbine and hydraulic design method thereof |
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|---|---|
| CN107299914B (en) | 2019-05-24 |
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