CN102878104A - Axial force balanced structure of multilevel central opening type centrifugal pump - Google Patents
Axial force balanced structure of multilevel central opening type centrifugal pump Download PDFInfo
- Publication number
- CN102878104A CN102878104A CN2012104166098A CN201210416609A CN102878104A CN 102878104 A CN102878104 A CN 102878104A CN 2012104166098 A CN2012104166098 A CN 2012104166098A CN 201210416609 A CN201210416609 A CN 201210416609A CN 102878104 A CN102878104 A CN 102878104A
- Authority
- CN
- China
- Prior art keywords
- impeller
- inter
- suction chamber
- axial force
- pump
- 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.)
- Granted
Links
Images
Abstract
The invention discloses an axial force balanced structure of a multilevel central opening type centrifugal pump. A plurality of and an odd number of impellers are assembled on a pump shaft, the odd number of impellers are separated into two groups, the two groups of impellers have different directions, one group has one more impeller than the other group, inter-level rings and inter-level sleeves are assembled between the two groups of impellers, the inter-level sleeves are positioned on the insides of the inter-level rings, so that the outlets of the two groups of impellers are communicated through gaps between the inter-level sleeves by the inter-level rings, a pressure-relief ring and a pressure-relief sleeve are assembled between a second suction cavity and a second throat bush, the pressure-relief sleeve is positioned on the inside of the pressure-relief sleeve, a balance tube is connected through a hollow cavity which is formed by the second throat bush, the pressure-relief ring and the pressure-relief sleeve and is communicated with a first suction cavity, so that the second suction cavity is communicated with the first suction cavity through the gap between the pressure-relief ring and the pressure-relief sleeve as well as the balance tube. According to the structure, the external diameter variation of the inter-level rings and the pressure-relief ring is adopted to form the axial force balance of a rotor, the structure is simple and easy to realize and a good axial force balance effect can be realized.
Description
Technical field
The invention belongs to multistage middle open formula centrifugal pump, specifically multistage middle open formula centrifugal pump axial force balance structure.
Background technique
The axial force of single stage centrifugal pump, smaller for axial force, structurally do not carry out balance, directly born by bearing; Larger for axial force, adopt the mode in choma binding equilibrium hole to come balance more.For multistage pump, its axial equilibrium of forces then adopts the structure of balancing drum associating thrust-bearing to come balancing axial thrust; Adopt Balance disc to come balancing axial thrust for sectional type multi-stage pump more.
Because the restriction of structural characteristics, for center-opening type multi-stage pump, the mode that axial force balance adopts the even level impeller to be arranged symmetrically with more is come the axial force of ballast pump.
Center-opening type multi-stage pump odd level axial force of impeller equilibrium structure is abroad also arranged, and is to adopt on the basis of back-to-back layout balancing axial thrust, and the axial force of unnecessary one-level impeller adopts the mode in choma binding equilibrium hole to come the unnecessary one-level axial force of balance.But this balance mode because it is larger affected by fluid, slightly has and calculates accidentally, and it is unbalance to be prone to axial force, causes damage of bearings.
Summary of the invention
The technical assignment of the technical problem to be solved in the present invention and proposition is to overcome existing center-opening type multi-stage pump odd level axial force of impeller equilibrium structure affected by fluid to be prone to more greatly axial force unbalance, cause the defective of damage of bearings, a kind of multistage middle open formula centrifugal pump axial force balance structure is provided.
Achieve the above object for this reason, multistage middle open formula centrifugal pump axial force balance structure of the present invention, comprise by pump seat, the pump housing that pump cover consists of, successively establish the first suction chamber by flowing in the pump housing, the second suction chamber, first throat's lining is established in the outer end of described the first suction chamber, second throat's lining is established in the outer end of described the second suction chamber, the bearing assemble of one pump shaft by being divided into pump housing two ends is on the pump housing and pass described first throat's lining, the first suction chamber, the second suction chamber, second throat's lining, it is characterized in that: assembling is a plurality of and be the impeller of odd number on the described pump shaft, this odd number impeller is divided into two groups, the opposite direction of described two groups of impellers and wherein one group have more an impeller than another group, assembling inter-stage ring between described two groups of impellers, the inter-stage cover, described inter-stage cover is assemblied on the described pump shaft, described inter-stage ring is assemblied on the described pump housing, it is inboard that described inter-stage cover is positioned at the inter-stage ring, so that the gap of the outlet of described two groups of impellers between overlapping by described inter-stage ring and inter-stage is communicated with, assemble pressure relief ring between described the second suction chamber and the second throat's lining, the pressure release cover, described pressure release cover is assemblied on the described pump shaft, described pressure relief ring is assemblied on the described pump housing, described pressure release cover is positioned at the pressure relief ring inboard, one balance tube is from described the second throat's lining and pressure relief ring, the cavity access that forms between the pressure release cover also is communicated with the first suction chamber, so that the gap of the second suction chamber between described pressure relief ring and pressure release cover, balance tube is communicated with the first suction chamber.
As the optimization technique means, the one group of impeller that is positioned at the upstream is positioned at many one of one group of impeller in downstream.The one group of impeller that perhaps is positioned at the upstream is positioned at few one of one group of impeller in downstream.
As the optimization technique means, described the first suction chamber, the second suction chamber lay respectively at the two end part of the described pump housing, the outlet that is positioned at one group of impeller of upstream connects described the second suction chamber by runner, and described runner is distributed in the described all sides that are positioned at one group of impeller in downstream.Further, the described outlet that is positioned at one group of impeller in downstream is positioned at the middle part of the pump housing and connects exhaust port, and described the first suction chamber connects suction port.
As the optimization technique means, make-up machinery sealing between each described bearing and the pump housing.
As the optimization technique means, described inter-stage cover, pressure release cover are assemblied on the pump shaft by key, and described inter-stage ring, pressure relief ring are positioned on the pump housing by pin.
The invention has the beneficial effects as follows: axial force balance is easy, easy realization simple in structure, and axial force balance is effective, and life of product is long.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the A section enlarged view among Fig. 1;
Fig. 3 is the B section enlarged view among Fig. 1;
Number in the figure explanation: 1-pump seat, 2-pump cover, 3-the first suction chamber, 4-the second suction chamber, 5-pump shaft, 6-bearing, the 7-bearing, 8-one-level impeller, 9-sencond stage impeller, three grades of impellers of 10-, 11-level Four impeller, 12-Pyatyi impeller, six grades of impellers of 13-, seven grades of impellers of 14-, 15-balance tube, 16-inter-stage ring, 17-inter-stage cover, 18-pressure relief ring, 19-pressure release cover, 20-mechanical seal, 21-mechanical seal, the 22-passage, 23-first throat's lining, 24-second throat's lining, X-pressure release cover 19, cavity between pressure relief ring 18 and the second throat's lining 24, cavity between 17 and seven grades of impellers 14 of Y-inter-stage cover, the cavity between Z-inter-stage cover 17 and the level Four impeller 11.
Embodiment
The present invention will be further described below in conjunction with Figure of description.
Multistage middle open formula centrifugal pump axial force balance structure of the present invention, as shown in Figure 1, it comprises by pump seat 1, the pump housing that pump cover 2 consists of, successively establish the first suction chamber 3 by flowing in the pump housing, the second suction chamber 4, first throat's lining is established in the outer end of the first suction chamber 3 (away from an end that sucks the impeller of fluid from the first suction chamber), second throat's lining is established in the outer end of the second suction chamber 4 (away from an end that sucks the impeller of fluid from the second suction chamber), the bearing 6 of one pump shaft 5 by being divided into pump housing two ends, 7 are assemblied on the pump housing and pass first throat's lining, the first suction chamber 3, the second suction chamber 4, second throat's lining, assembling is a plurality of and be the impeller of odd number on the pump shaft 5, this odd number impeller is divided into two groups, the opposite direction of two groups of impellers and wherein one group have more an impeller (being illustrated as 7 grades of impellers) than another group, assembling inter-stage ring 16 between two groups of impellers, inter-stage cover 17, inter-stage cover 17 is assemblied on the pump shaft 5, inter-stage ring 16 is assemblied on the pump housing, inter-stage cover 17 is positioned at inter-stage ring 16 inboards, so that the outlet of two groups of impellers is communicated with the gap that inter-stage overlaps between 17 by inter-stage ring 16, assembling pressure relief ring 18 between the second suction chamber 4 and the second throat's lining, pressure release cover 19, pressure release cover 19 is assemblied on the pump shaft 5, pressure relief ring 18 is assemblied on the pump housing, pressure release cover 19 is positioned at pressure relief ring 18 inboards, one balance tube 15 is from second throat's lining and pressure relief ring 18, the cavity X access that forms between the pressure release cover 19 also is communicated with the first suction chamber 3, so that the gap of the second suction chamber 4 between pressure relief ring 18 and pressure release cover 19, balance tube 15 is communicated with the first suction chamber 3.
As further improving and replenishing technique scheme, the present invention also comprises following additional technical characteristics, although figure has comprised following all additional technical features, it is preferred embodiment of the present invention, but the present invention is not limited to this situation, according to specifically acting on they is selected on the described technological scheme of epimere when enforcement is of the present invention.
At first, the one group of impeller that is positioned at the upstream is positioned at many one of one group of impeller in downstream.
Secondly, the first suction chamber 3, the second suction chamber 4 lay respectively at the two end part of the pump housing, and the outlet that is positioned at one group of impeller of upstream connects the second suction chamber by runner 22, and runner 22 is distributed in all sides of the one group of impeller that is positioned at the downstream.Further, the outlet that is positioned at one group of impeller in downstream is positioned at the middle part of the pump housing and connects exhaust port, and the first suction chamber connects suction port.
The 3rd, each bearing 6,7 and the pump housing between make-up machinery sealing 20,21.
The 4th, inter-stage cover 17, pressure release cover 19 are assemblied on the pump shaft 5 by key, and inter-stage ring 16, pressure relief ring 18 are positioned on the pump housing by pin.
According to Fig. 1 analysis as can be known, except every grade of impeller produces the axial force separately, first throat's lining 23, second throat's lining 24 at inter-stage cover 17, pressure release cover 19 and two ends also produce axial force in totally four zones, wherein, first throat's lining 23 at two ends, second throat's lining, 24 position axial forces are less, generally ignore.
In seven grades of impellers, except one-level impeller 8, the forward and backward choma outside dimension of all the other impellers at different levels is identical, and the axial force size of every grade of impeller generation is identical; And, sencond stage impeller 9, three grades of impellers 10, level Four impellers 11 just overlap centered by 17 by inter-stage with Pyatyi impeller 12, six grades of impellers 13, seven grades of impeller 14 mounting points, symmetry is installed dorsad, and sencond stage impeller 9, three grades of axial force sensing right-hand members that impeller 10, level Four impeller 11 produce, Pyatyi impeller 12, six grades of impellers 13, seven grades of axial force sensing left ends that impeller 14 produces, therefore, the axial force of sencond stage impeller 9, three grades of impellers 10, level Four impellers 11 and Pyatyi impellers 12, six grades of impellers 13, seven grades of impeller 14 generations is balance just, cancels each other.Remaining one-level impeller 8, inter-stage cover 17, pressure release are overlapped 19 3 parts because its two ends pressure does not wait, and will produce separately axial force.Thus, the rotor axial equilibrium of forces calculates, and only needs to adjust, and the axial force balance at 19 3 part positions is overlapped in one-level impeller 8, inter-stage cover 17, pressure release.
The axial force of one-level impeller 8 can be divided two-part.First portion: compression area is the axial area between the one-level impeller 8 forward and backward choma external diameters, and pressure difference is the lift of this impeller, and direction is pointed to right-hand member.Second portion: compression area be one-level impeller 8 rear choma external diameters to the axial area between the pump shaft 5, pressure difference also is the lift of this impeller, direction is pointed to right-hand member.
The Axial Force Calculating of pressure release cover 19 is products of its compression area and front and back pressure difference.Compression area is that the axial area between 19 external diameters and the pump shaft is overlapped in pressure release.Because pressure release cover 19, pressure relief ring 18 are communicated with the first suction chamber 3 with cavity X between second throat's lining 24, pressure release overlaps 19, the cavity X pressure between pressure relief ring 18 and the second throat's lining 24 is pump inlet pressure.It is the second suction chamber 4 that 19 opposite sides are overlapped in pressure release, and it is the outlet cavity of one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, level Four impeller 11.So the pressure difference of pressure release cover 19 is one-level impeller 8, sencond stage impeller 9, three grades of lift sums that impeller 10, level Four impeller 11 produce, axial force is pointed to left end.
The Axial Force Calculating of inter-stage cover 17 is products of its compression area and front and back pressure difference.Compression area is that inter-stage overlaps 17 external diameters to the axial area between the pump shaft 5.The exhaust port that is connected pump because of inter-stage cover 17 with the cavity Y between seven grades of impellers 14, inter-stage cover 17 is connected the second suction chamber 4 with cavity Z between the level Four impeller 11 through passage 22, be one-level impeller 8 because of the second suction chamber 4 again, sencond stage impeller 9, three grades of impellers 10, the outlet cavity of level Four impeller 11, so the pressure difference of inter-stage cover 17 is one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, level Four impeller 11, Pyatyi impeller 12, six grades of impellers 13, the lift of seven grades of impellers 14 deducts one-level impeller 8, sencond stage impeller 9, three grades of impellers 10, the lift of level Four impeller 11, be Pyatyi impeller 12, six grades of impellers 13, the lift of seven grades of impellers 14 and, axial force is pointed to right-hand member.
Thus, calculate the axial force of this odd level vane rotor, we only need allow the axial force of one-level impeller 8 generations and the axial force sums of pressure release cover 19 generations and the axial force balances that inter-stage cover 17 produces get final product.Adopt said method just to solve the axial force balance difficult problem of middle open type odd level multistage pump.This structure is not only calculated feasible in theory, but also has passed through the practice use checking of tens model center-opening type multi-stage pumps.
According to the above description, one group of impeller that can make the one group of impeller that is positioned at the upstream be positioned at the downstream during implementation lacks one, can realize the object of the invention equally.
The present invention adopts the external diameter of internode ring and pressure relief ring to change, and forms the rotor axial equilibrium of forces; In the odd level impeller, 7 grades of impellers for example, wherein six grades of employings are arranged symmetrically with self-balanced thrust, and remaining one-level impeller adopts inter-stage cover and the variation of inter-stage ring, pressure release cover and pressure relief ring outside dimension to come balance.Structure of the present invention is through the design verification of tens kinds of specification products, and it is easy to have an axial force balancing method, easy realization simple in structure, the characteristics that axial force balance is effective.
Claims (7)
1. multistage middle open formula centrifugal pump axial force balance structure, comprise by pump seat (1), the pump housing that pump cover (2) consists of, successively establish the first suction chamber (3) by flowing in the pump housing, the second suction chamber (4), first throat's lining (23) is established in the outer end of described the first suction chamber (3), second throat's lining (24) is established in the outer end of described the second suction chamber (4), the bearing (6 of one pump shaft (5) by being divided into pump housing two ends, 7) be assemblied on the pump housing and pass described first throat's lining (23), the first suction chamber (3), the second suction chamber (4), second throat's lining (24), it is characterized in that: described pump shaft (5) upward assembles a plurality of and is the impeller of odd number, this odd number impeller is divided into two groups, the opposite direction of described two groups of impellers and wherein one group have more an impeller than another group, assembling inter-stage ring (16) between described two groups of impellers, inter-stage cover (17), described inter-stage cover (17) is assemblied on the described pump shaft (5), described inter-stage ring (16) is assemblied on the described pump housing, described inter-stage cover (17) is positioned at inter-stage ring (16) inboard, so that the outlet of described two groups of impellers is communicated with gap between the inter-stage cover (17) by described inter-stage ring (16), assemble pressure relief ring (18) between described the second suction chamber (4) and the second throat's lining, pressure release cover (19), described pressure release cover (19) is assemblied on the described pump shaft (5), described pressure relief ring (18) is assemblied on the described pump housing, described pressure release cover (19) is positioned at pressure relief ring (18) inboard, one balance tube (15) is from described second throat's lining and pressure relief ring (18), the cavity (X) that forms between the pressure release cover (19) accesses and is communicated with the first suction chamber (3), so that the gap of the second suction chamber (4) between described pressure relief ring (18) and pressure release cover (19), balance tube (15) is communicated with the first suction chamber (3).
2. multistage middle open formula centrifugal pump axial force balance structure according to claim 1 is characterized in that: the one group of impeller that is positioned at the upstream is positioned at many one of one group of impeller in downstream.
3. multistage middle open formula centrifugal pump axial force balance structure according to claim 1 is characterized in that: the one group of impeller that is positioned at the upstream is positioned at few one of one group of impeller in downstream.
4. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, it is characterized in that: described the first suction chamber (3), the second suction chamber (4) lay respectively at the two end part of the described pump housing, the outlet that is positioned at one group of impeller of upstream connects described the second suction chamber (4) by runner (22), and described runner (22) is distributed in the described all sides that are positioned at one group of impeller in downstream.
5. multistage middle open formula centrifugal pump axial force balance structure according to claim 4, it is characterized in that: the described outlet that is positioned at one group of impeller in downstream is positioned at the middle part of the pump housing and connects exhaust port, and described the first suction chamber connects suction port.
6. multistage middle open formula centrifugal pump axial force balance structure according to claim 1 is characterized in that: make-up machinery sealing (20,21) between each described bearing (6,7) and the pump housing.
7. multistage middle open formula centrifugal pump axial force balance structure according to claim 1, it is characterized in that: described inter-stage cover (17), pressure release cover (19) are assemblied on the pump shaft (5) by key, and described inter-stage ring (16), pressure relief ring (18) are positioned on the pump housing by pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210416609.8A CN102878104B (en) | 2012-10-25 | 2012-10-25 | Axial force balanced structure of multilevel central opening type centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210416609.8A CN102878104B (en) | 2012-10-25 | 2012-10-25 | Axial force balanced structure of multilevel central opening type centrifugal pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102878104A true CN102878104A (en) | 2013-01-16 |
| CN102878104B CN102878104B (en) | 2014-11-26 |
Family
ID=47479562
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210416609.8A Active CN102878104B (en) | 2012-10-25 | 2012-10-25 | Axial force balanced structure of multilevel central opening type centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102878104B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225624A (en) * | 2013-04-24 | 2013-07-31 | 嘉利特荏原泵业有限公司 | Double-casing symmetric type radial subdivision multiple-stage centrifugal pump |
| CN107850075A (en) * | 2015-08-10 | 2018-03-27 | 诺沃皮尼奥内技术股份有限公司 | Centrifugal pump |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439808A (en) * | 2002-07-10 | 2003-09-03 | 甘肃工业大学 | Multistage sectional centrifugal pump with symmetric impeller arrangement |
| CN1815039A (en) * | 2006-03-03 | 2006-08-09 | 江苏大学 | Multi-stage centrifugal pump capable of self-balancing axial force by impeller |
| CN101509490A (en) * | 2009-04-03 | 2009-08-19 | 湖北三峡泵业有限公司 | Axial force self-balancing multiple stage centrifugal pump |
| GB2462635A (en) * | 2008-08-14 | 2010-02-17 | William Paul Hancock | Turbo-machine axial thrust balancing |
| EP2163767A1 (en) * | 2008-09-15 | 2010-03-17 | Pompe Garbarino S.p.A. | Multiple-stage centrifugal pump including a controlled leakage hydraulic balancing drum |
| CN101892990A (en) * | 2010-06-13 | 2010-11-24 | 西安航天泵业有限公司 | Horizontal split multi-stage pump |
| CN201934361U (en) * | 2010-11-03 | 2011-08-17 | 西安泵阀总厂有限公司 | Mosaic sealing ring structure of centrifugal pump |
| CN202811460U (en) * | 2012-10-25 | 2013-03-20 | 浙江佳力科技股份有限公司 | Multistage middle-open type centrifugal pump axial force balance structure |
-
2012
- 2012-10-25 CN CN201210416609.8A patent/CN102878104B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1439808A (en) * | 2002-07-10 | 2003-09-03 | 甘肃工业大学 | Multistage sectional centrifugal pump with symmetric impeller arrangement |
| CN1815039A (en) * | 2006-03-03 | 2006-08-09 | 江苏大学 | Multi-stage centrifugal pump capable of self-balancing axial force by impeller |
| GB2462635A (en) * | 2008-08-14 | 2010-02-17 | William Paul Hancock | Turbo-machine axial thrust balancing |
| EP2163767A1 (en) * | 2008-09-15 | 2010-03-17 | Pompe Garbarino S.p.A. | Multiple-stage centrifugal pump including a controlled leakage hydraulic balancing drum |
| CN101509490A (en) * | 2009-04-03 | 2009-08-19 | 湖北三峡泵业有限公司 | Axial force self-balancing multiple stage centrifugal pump |
| CN101892990A (en) * | 2010-06-13 | 2010-11-24 | 西安航天泵业有限公司 | Horizontal split multi-stage pump |
| CN201934361U (en) * | 2010-11-03 | 2011-08-17 | 西安泵阀总厂有限公司 | Mosaic sealing ring structure of centrifugal pump |
| CN202811460U (en) * | 2012-10-25 | 2013-03-20 | 浙江佳力科技股份有限公司 | Multistage middle-open type centrifugal pump axial force balance structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103225624A (en) * | 2013-04-24 | 2013-07-31 | 嘉利特荏原泵业有限公司 | Double-casing symmetric type radial subdivision multiple-stage centrifugal pump |
| CN107850075A (en) * | 2015-08-10 | 2018-03-27 | 诺沃皮尼奥内技术股份有限公司 | Centrifugal pump |
| US11555496B2 (en) | 2015-08-10 | 2023-01-17 | Nuovo Pignone Tecnologie Srl | Centrifugal pump |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102878104B (en) | 2014-11-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2014086730A1 (en) | Back-to-back centrifugal pump | |
| CN103939312A (en) | Balanced type double-row large-displacement axial plunger pump | |
| CN201265547Y (en) | Balancing type single-suction horizontal multiple-stage centrifugal pump | |
| CN205298048U (en) | V -arrangement incision blade stationary flow centrifugal pump | |
| CN202811460U (en) | Multistage middle-open type centrifugal pump axial force balance structure | |
| CN107559206A (en) | First-stage double-absorption structure Double-casing symmetrical expression radial direction subdivision centrifugal multistage pump multiple centrifugal pump | |
| CN102322443A (en) | Single-stage centrifugal pump with balanced axial force | |
| CN102878104B (en) | Axial force balanced structure of multilevel central opening type centrifugal pump | |
| CN102840142B (en) | The multi-stage shield pump that a kind of motor is put | |
| CN106837806B (en) | A kind of sectional type parallel connection multistage pump | |
| CN205533288U (en) | Double -suction multi -stage centrifugal pump | |
| CN106194822A (en) | A kind of centrifugal pump closed type impeller and method for designing thereof | |
| CN206988131U (en) | A kind of double-impeller centrifugal formula water pump | |
| CN205298047U (en) | Stationary flow centrifugal pump | |
| CN102828984A (en) | Axial force control method of back-to-back type two-stage centrifugal compressor | |
| CN105782066A (en) | Double-suction and multi-stage centrifugal pump | |
| CN204200683U (en) | Centrifugal pump spiral casing | |
| CN104314827A (en) | Middle discharging section of multi-outlet horizontal single-suction sectional multistage centrifugal pump | |
| CN206190540U (en) | Multistage water pump | |
| CN206290481U (en) | A kind of centrifugal pump closed type impeller | |
| CN205154644U (en) | Novel horizontal multistage vortex pump | |
| CN202991653U (en) | Tri-diffusion tube spiral case structure balancing the radial bearing force on centrifugal pump | |
| CN203067360U (en) | Space guide vane body provided with suction surface auxiliary vanes | |
| CN101936293A (en) | Double-inlet large-flow multistage centrifugal pump | |
| CN102003395A (en) | Multi-purpose self-balancing multistage pump for ship |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |