CN1008293B - Slow speed pump case - Google Patents
Slow speed pump caseInfo
- Publication number
- CN1008293B CN1008293B CN 85105293 CN85105293A CN1008293B CN 1008293 B CN1008293 B CN 1008293B CN 85105293 CN85105293 CN 85105293 CN 85105293 A CN85105293 A CN 85105293A CN 1008293 B CN1008293 B CN 1008293B
- Authority
- CN
- China
- Prior art keywords
- cutwater
- housing
- area
- pump
- discharge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000007599 discharging Methods 0.000 claims description 11
- 239000013013 elastic material Substances 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 12
- 210000000867 larynx Anatomy 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Abstract
The present invention relates to a centrifugal slurry pump casing, which comprises a discharge throat part. Compared with the area of the discharge throat part when the pump operates at the flow speed of a maximum efficiency point, the area of the throat part is reduced. The pump casing is suitable for being operated at a flow speed of the maximum efficiency point in a range of 30 to 70%, the shape of the pump casing has an elongated cutwater, and the cutwater enables the area of the throat part of the casing to be reduced to be 30 to 70% of the area of a discharge neck of a discharge flange.
Description
What the present invention relates to is the shell construction of an improved centrifugal pump, and particularly about handling the pump of suspension polishing particles (being mud), flowing velocity is significantly smaller than the best efficiency point flow velocity of the sort of pump there.
The housing of centrifugal pump plays trap, comprises the liquid from impeller in it, and at full speed diffusion and guiding liquids arrive the outside or discharge branch road simultaneously.
Be used to handle the pump of the liquid of non-polishing particles or cleaning, when providing the most effective structure, between the impeller of cutwater and housing, a little gap (being approximately the 2-5% of impeller diameter) arranged usually.
On the contrary, the processing that has designed fine abrasive particles centrifugal pump (slurry pump) fibrous or that suspend has a bigger gap between impeller and housing, stops up and high concentrated wear preventing, this concentrated wear will be created under the closely spaced situation.In addition, common slurry pump housing has a constant area to discharge neck usually, at the cross section of cutwater only less than at the 10-20% that discharges flange place area.The structure of the combination of the big cutwater gap and the discharge neck of constant area provides enough overall performances with " best efficiency point " flow velocity (BEP) of pump.
But it is problematic stoping the abrasive wear of the part of cutwater back with the flow velocity (BEP) less than best efficiency point.Because these wearing and tearing are to discharge branch road and return volute again with unsuitable angle when fluid can not flow out, when around cutwater, flowing since recirculation and eddy current produce.Because variation or the pump and the need of work mismatch of rules flow velocity, slurry pump is often had to off-design condition work (being that flow velocity and best efficiency point are inconsistent).Japan Patent JP-spy opens clear 56-85595 and discloses a kind of slow speed pump case, but its degree of wear is bigger.
The objective of the invention is, solve the wear problem of above-mentioned slurry pump, the housing of the pump that is provided has one through improved hull shape in cutwater district and discharge branch road district, by changing the flow rate pump of common streamlines pattern to be suitable for reducing, so that make concentrated wear reduce to minimum degree.
In a kind of main form, the present invention includes one has the centrifugal slurry housing of discharging throat, and the area of this discharge throat has been reduced with comparing with the area of the discharge throat of the pump of best efficiency point work.
In another form, the present invention includes a centrifugal slurry housing that is fit to the flow velocity work of the 30-70% scope of best efficiency point flow velocity, this pump case shape has the cutwater of an extension, and this cutwater makes the throat opening area of housing be reduced to the 30-70% of the discharge neck area of discharging the flange place.
Most preferred embodiment of the present invention comprises a centrifugal slurry housing, and its cutwater lateral projection is stopped up the discharge neck partly, thereby has reduced discharge area.Behind the cutwater (promptly discharging neck more makes progress) and be a thickened portion or projection at the opposite side of cutwater, it further plays water conservancy diversion, has reduced the discharge area.It mainly is in the plane perpendicular to the impeller shaft line that area reduces, thereby the decrease of the useful area from cutwater to the discharge neck (throat opening area) of discharging flange approximately is the 30-70% that discharges the discharge neck area of flange.
The present invention and the little hydraulic performance that influences pump, though the best efficiency point flow velocity reduces a little, it is constant substantially that the pump head Flow characteristics still keeps, and increased purposes of the present invention so greatly.
When the pumping abrasive media, the same with centrifugal pump, housing can be made with hard metal, also can make by elastic material, for the ease of assembling, housing can be divided into 2 or 3, even can only be the pump lining with outer cladding plate, and what the present invention related generally to is the interior shape of hydraulic pressure rather than its profile, material or the bearing method of housing.
The present invention will illustrate by embodiment and with reference to accompanying drawing.
Fig. 1 is the impeller of common centrifugal water pump and the sectional drawing of housing, and this sectional drawing is in wheel rotation axis horizontal frontal plane.
Fig. 2 is the impeller of common centrifugal slurry and the sectional drawing of housing, and this sectional drawing is in the horizontal frontal plane of wheel rotation axis.
Fig. 3 is the centrifugal slurry impeller of the embodiment of the invention and the sectional drawing of housing, and this sectional drawing is in the horizontal frontal plane of wheel rotation axis.
Fig. 4 represents the cross section by the housing a place of Fig. 3;
Fig. 5 represents the cross section by Fig. 3 housing b place;
Fig. 6 is the part sectioned view of housing of the present invention, and this sectional drawing is in passing through the plane of wheel rotation axis.
With reference to Fig. 1, common centrifugal pump casing (1) progressively increases radius of curvature from cutwater (2) is initial up to the point tangent with discharging neck (3).Impeller (4) rotates in housing, and cutwater has the circumferential clearance (5) of a minimum in the housing.The area of discharging neck is usually increased to discharging flange (7) gradually by the throat (6) near cutwater.
Conventional mud pump case (8) among water pump cover described above (1) and Fig. 2 clearly mainly is to have strengthened cutwater gap (9) relatively, between throat (10) and discharge flange (11) very uniform discharge neck area is arranged.Can see clearly be this structure allow easily fluid with the flow velocity (with respect to the best efficiency point flow velocity) that reduces round cutwater recirculation, this is because the open throat opening area and the shape of cutwater cause.
Fig. 3 represents the most preferred embodiment of slurry pump housing of the present invention, and this embodiment comprises a common slurry pump housing (12), has non-common shape in cutwater.In order to reduce throat opening area (13) and prevention recirculation, cutwater (14) extend through throat does not change cutwater gap (15) significantly, and protrusion shape (16) substantially is added on the wall on the opposite of discharging neck.The geometrical shape of Xing Chenging causes reducing of larynx neck area like this, larynx neck area (13) is in 0.3 to 0.7 scope with the ratio of discharging area (17) like this, according to the needs of discrete structure, cutwater gap (15) impeller diameter 5% and 40% between scope in.
Two cross sections that Fig. 4, Fig. 5 represent are sectional drawings of discharge neck center line horizontal frontal plane shown in Figure 3, can see that the width (23) of discharging flange (18) is identical with the width that larynx neck (19) is located approx.But the width of larynx neck can discharge flange 50% and 100% between.
Fig. 6 represents is half sectional view (c) by the represented impeller center line of Fig. 3.This figure expresses the relation between impeller (20) and the pump case (21).Improved cutwater shape (22) is represented with continuous fillet radius on cutwater summit and housing sidewall.
Owing to the present invention is described, is clear that not breaking away from spirit of the present invention very much can make various modification in conjunction with most preferred embodiment.
Claims (3)
1, a kind of slow speed pump case, the interior shape of the interior shape of this housing or the lining when having lining has a cutwater that extends into throat, it is characterized in that also having one in discharging neck the cutwater opposite locate to make the projection of outstanding shape after a while, this projection and cutwater are reduced to the throat opening area of housing together and discharge the 30-70% that the flange place discharges the neck area.
2, according to the pump case of claim 1, it is characterized in that having an impeller to be contained in the housing, and the radial clearance of cutwater impeller diameter 5～40% between.
3,, it is characterized in that described housing made by hard metal or elastic material according to the pump case of claim 1 or 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105293 CN1008293B (en) | 1985-07-10 | 1985-07-10 | Slow speed pump case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 85105293 CN1008293B (en) | 1985-07-10 | 1985-07-10 | Slow speed pump case |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85105293A CN85105293A (en) | 1987-01-07 |
| CN1008293B true CN1008293B (en) | 1990-06-06 |
Family
ID=4794387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 85105293 Expired CN1008293B (en) | 1985-07-10 | 1985-07-10 | Slow speed pump case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1008293B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6051056B2 (en) * | 2013-01-15 | 2016-12-21 | 株式会社荏原製作所 | Centrifugal pump |
-
1985
- 1985-07-10 CN CN 85105293 patent/CN1008293B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85105293A (en) | 1987-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |