CN201794792U - Novel multi-stage centrifugal pump - Google Patents
Novel multi-stage centrifugal pump Download PDFInfo
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- CN201794792U CN201794792U CN2010202559309U CN201020255930U CN201794792U CN 201794792 U CN201794792 U CN 201794792U CN 2010202559309 U CN2010202559309 U CN 2010202559309U CN 201020255930 U CN201020255930 U CN 201020255930U CN 201794792 U CN201794792 U CN 201794792U
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- balancing
- balancing drum
- impeller
- drum
- pump
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- 239000012530 fluid Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 238000000034 method Methods 0.000 description 8
- 239000007788 liquid Substances 0.000 description 7
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000009467 reduction Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to a novel multi-stage centrifugal pump, which comprises a pump shaft. A set of impellers and guide blades are arranged on the pump shaft, flow channels among the impellers are communicated by the aid of a middle section, a water discharge section is connected with the tail-stage impeller, a rear axial force balancing device is arranged behind the tail-sage impeller and consists of a balancing drum, a balancing drum sleeve and a balancing chamber, the balancing drum is mounted on the pump shaft, the balancing drum sleeve is sleeved outside the balancing drum, a clearance is reserved between the balancing drum and the balancing drum sleeve, and a plurality of axial grooves are arranged on the surface of the balancing drum. The novel multi-stage centrifugal pump has the advantages that 1, leakage at the axial clearance between the balancing drum and the balancing drum sleeve is reduced, and difference between front pressure and rear pressure of the balancing drum is increased, thereby favoring balancing of the drum balancing axial force, 2, the novel multi-stage centrifugal pump is provided with a plurality of axial balancing devices to meet the requirement of axial force balance, and 3, the performance range of the pump can be improved, higher capacity loss caused by incapability of sufficiently entering next-stage impellers of fluid due to excessively large clearances among the impellers and the guide blades can be avoided, and efficiency of the pump is improved.
Description
Technical field
The utility model relates to a kind of centrifugal pump, especially a kind of novel multistage centrifugal pump.
Background technique
Multistage centrifugal pump is a kind of important pump series products that is widely used in each field of the development of the national economy, and its axial force is very big, have in addition can reach 10
5N, the axially loaded imbalance is to cause the one of the main reasons of multistage pump operation troubles.When adopting the balancing drum balancing axial thrust, balancing drum and balancing drum cover gap location can produce bigger leakage loss, and can not satisfy the axial force balance requirement, if but reduce leakage loss by reducing the gap, mutual friction mutually easily again causes adverse effects such as vibration equipment between balancing drum and the balancing drum cover.Usually only has a cover Equilibrator in the multistage pump, the position is at the impeller rear side, for the multistage pump more for progression, that axial force is bigger, a cover Equilibrator is difficult to balance whole axial forces usually, still can have bigger residual axial force on the pump shaft.The cutting impeller external diameter is the common method that changes the pump performance scope, but cuts when too much when impeller outer diameter, and exit width becomes greatly, and actual head curve easily produces hump; Simultaneously, because of excesssive gap between impeller and the stator, fluid can not fully enter the next stage impeller, thereby causes bigger volumetric loss, and the efficient of pump obviously descends.
Summary of the invention
The utility model will solve the shortcoming of above-mentioned prior art, provides a kind of balancing drum and balancing drum cover gap leakage loss little, difficult friction, and residual axial force is little, and changes the impeller performance requirement and the less novel multistage centrifugal pump of decrease in efficiency.
The utility model solves the technological scheme that its technical problem adopts: this novel multistage centrifugal pump, comprise pump shaft, the stator that pump shaft is provided with one group of impeller and is mated, runner between the impeller is communicated with by the stage casing, wherein last impeller is an impeller, impeller is connected with the guttation section, described impeller rear side is provided with a rearmounted axial thrust balancing devices, this device is by the balancing drum that is contained on the pump shaft, being sheathed on the outer balancing drum cover of balancing drum and a balance cylinder forms, wherein be provided with the gap between balancing drum and the balancing drum cover, the balancing drum surface arrangement has some axial notches.
As preferably, the balancing drum cover of described rearmounted axial thrust balancing devices is fixed by the extension of guttation section.
As preferably, be provided with at least one mid-axial thrust balancing devices identical between the described impeller with rearmounted axial thrust balancing devices structure.
As preferably, the balancing drum cover of described mid-axial thrust balancing devices is fixed by a special stage casing, fluid passage before and after special stage casing connects, the balance cylinder of mid-axial thrust balancing devices is formed by the end face ring bag of special stage casing, end cap and balancing drum and balancing drum cover.
As preferably, described impeller forms exit width along the external diameter medial cuts and reduces, and the constant structure of external diameter and inlet diameter.
The effect that model utility is useful is: one, the leakage rate at the radial clearance place between balancing drum and the balancing drum cover reduces, and has reduced leakage loss, has increased balancing drum front and back pressure reduction, helps the balancing drum balancing axial thrust; Two, have the axial thrust balancing device of many covers, can reduce the residual axial force of the pump that progression is many, axial force is big, satisfy the axial force balance requirement; Three, the mode that does not change impeller outer diameter and inlet diameter by changing impeller outlet width is revised impeller pattern, can improve the pump performance scope, and can avoid because of excesssive gap between impeller and the stator, fluid can not fully enter the next stage impeller and the big volumetric loss that causes, compare with the modification model method of cutting impeller external diameter, this method has improved the efficient of pump.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is the structural representation of axial thrust balancing devices;
Fig. 3 is the sectional view of axial thrust balancing devices;
Fig. 4 is the special modification model method of cutting impeller of the present utility model;
Fig. 5 is the modification model method of traditional cutting impeller;
Description of reference numerals: impeller 1, stator 2, stage casing 3, pump shaft 4, special stage casing 5, balancing drum 6, balancing drum cover 7, balance cylinder 8, impeller 9, guttation section 10, gap 11, groove 12, rearmounted axial thrust balancing devices 13, mid-axial thrust balancing devices 14, end cap 15.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
Embodiment: as Fig. 1, novel multistage centrifugal pump comprises pump shaft 4, the stator 2 that pump shaft 4 is provided with one group of impeller 1 and is mated, runner between the impeller 1 is communicated with by stage casing 3, impeller 9 is connected with guttation section 10, when pump turns round, liquid is inhaled in the pump from the ingress, effect through impeller 1, the speed energy and the pressure energy of liquid all obtain increasing, and enter the next stage impeller through stator 2 and stage casing 3 then, and final liquid is discharged to guttation section 10 by impeller 9, can be converted into pressure energy in guttation section 10 most of speed, transfer out along discharge conduit then.
Wherein impeller 9 rear sides are provided with a rearmounted axial thrust balancing devices 13, as Fig. 2,3, by balancing drum 6, be sheathed on the outer 7 and balance cylinders 8 of balancing drums cover of balancing drum 6 and form, balancing drum cover 7 is fixed by the extension of guttation section 10, wherein be provided with gap 11 between balancing drum 6 and the balancing drum cover 7, balancing drum 6 surface arrangement have some axial notches 12.During the pump running, the liquid at groove 12 places pivots with identical rotating speed and carries out circular movement, thereby has produced centrifugal force, and this partially liq along radial motion, has hindered flowing of balancing drum gap 11 place's leak fluid under action of centrifugal force.Because groove 12 inside are enclosed space, after liquid was taken out of, the pressure of its inner space must be reduced to negative pressure, and is more little the closer to bottom pressure.Therefore can form a bigger inside and outside differential pressure in groove 12 bottoms and outlet port, the liquid that hinders groove 12 inside overflows, thereby make the liquid at place, groove 12 spaces reach transient equiliblium, form the waterwall effect, further hinder flowing of balancing drum gap 11 place's leak fluid, made the leakage rate at radial clearance place reduce, reduced leakage loss, increase balancing drum front and back pressure reduction, helped the balancing drum balancing axial thrust.
At pump shaft 4 middle parts, also be provided with a mid-axial thrust balancing devices 14 between the impeller 1, its structure is identical with rearmounted axial thrust balancing devices 13, balancing drum cover 7 is fixing by the special stage casing 5 that connects fluid passage, can satisfy the axial force balance requirement of the pump that progression is many, axial force is big, guarantee the normal operation of pump.
As Fig. 4, the impeller 1 in the pump adopts the special modification model method to revise, along the external diameter medial cuts, compare with traditional modification model method as shown in Figure 5, its exit width reduces, and impeller outer diameter and inlet diameter are constant, improve the pump performance scope, improved the efficient of pump.
In addition to the implementation, the utility model can also have other mode of executions.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop on the protection domain of the utility model requirement.
Claims (5)
1. novel multistage centrifugal pump, comprise pump shaft (4), the stator (2) that pump shaft (4) is provided with one group of impeller (1) and is mated, runner between the impeller (1) is communicated with by stage casing (3), wherein last impeller (1) is impeller (9), impeller (9) is connected with guttation section (10), it is characterized in that: described impeller (9) rear side is provided with a rearmounted axial thrust balancing devices (13), this device is by the balancing drum (6) that is contained on the pump shaft (4), being sheathed on an outer balancing drum cover (7) of balancing drum (6) and a balance cylinder (8) forms, wherein be provided with gap (11) between balancing drum (6) and the balancing drum cover (7), balancing drum (6) surface arrangement has some axial notches (12).
2. novel multistage centrifugal pump according to claim 1 is characterized in that: the balancing drum cover (7) of described rearmounted axial thrust balancing devices (13) is fixed by the extension of guttation section (10).
3. novel multistage centrifugal pump according to claim 1 is characterized in that: be provided with at least one mid-axial thrust balancing devices (14) identical with rearmounted axial thrust balancing devices (13) structure between the described impeller (1).
4. novel multistage centrifugal pump according to claim 3, it is characterized in that: the balancing drum cover (7) of described mid-axial thrust balancing devices (14) is fixing by a special stage casing (5), fluid passage before and after special stage casing (5) connects, the balance cylinder (8) of mid-axial thrust balancing devices (14) is formed by the end face ring bag of special stage casing (5), end cap (15) and balancing drum (6) and balancing drum cover (7).
5. according to any one described novel multistage centrifugal pump of claim 1-4, it is characterized in that: described impeller (1) forms exit width along the external diameter medial cuts and reduces, and the constant structure of external diameter and inlet diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202559309U CN201794792U (en) | 2010-07-06 | 2010-07-06 | Novel multi-stage centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202559309U CN201794792U (en) | 2010-07-06 | 2010-07-06 | Novel multi-stage centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201794792U true CN201794792U (en) | 2011-04-13 |
Family
ID=43849701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202559309U Expired - Fee Related CN201794792U (en) | 2010-07-06 | 2010-07-06 | Novel multi-stage centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201794792U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865138A (en) * | 2010-07-06 | 2010-10-20 | 浙江工业大学 | Novel multistage centrifugal pump |
| CN103527506A (en) * | 2013-10-11 | 2014-01-22 | 浙江大学 | Throttling bush with adjustable clearance for multiple-stage centrifugal pump |
| CN106795891A (en) * | 2014-10-14 | 2017-05-31 | 株式会社荏原制作所 | The impeller assembly of centrifugal pump |
-
2010
- 2010-07-06 CN CN2010202559309U patent/CN201794792U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865138A (en) * | 2010-07-06 | 2010-10-20 | 浙江工业大学 | Novel multistage centrifugal pump |
| CN103527506A (en) * | 2013-10-11 | 2014-01-22 | 浙江大学 | Throttling bush with adjustable clearance for multiple-stage centrifugal pump |
| CN103527506B (en) * | 2013-10-11 | 2016-02-10 | 浙江大学 | A kind of nockbush adjustable for multistage centrifugal pump gap |
| CN106795891A (en) * | 2014-10-14 | 2017-05-31 | 株式会社荏原制作所 | The impeller assembly of centrifugal pump |
| US10626880B2 (en) | 2014-10-14 | 2020-04-21 | Ebara Corporation | Impeller assembly for centrifugal pumps |
| CN106795891B (en) * | 2014-10-14 | 2020-11-10 | 株式会社荏原制作所 | Impeller assembly for centrifugal pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20130706 |