CN212536242U - Volute type discharging section structure for multi-stage pump and multi-stage pump - Google Patents
Volute type discharging section structure for multi-stage pump and multi-stage pump Download PDFInfo
- Publication number
- CN212536242U CN212536242U CN202021809238.6U CN202021809238U CN212536242U CN 212536242 U CN212536242 U CN 212536242U CN 202021809238 U CN202021809238 U CN 202021809238U CN 212536242 U CN212536242 U CN 212536242U
- Authority
- CN
- China
- Prior art keywords
- section
- rounded rectangle
- cavity
- multistage pump
- cross
- 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.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to a section structure and multistage pump are told to spiral case formula for multistage pump, the section structure of told includes spiral case's section cavity of told, and multistage pump's last stage impeller directly links up the import of the section cavity of told, and the export of the exit linkage multistage pump of the section cavity of told, the section cavity cross-section of told becomes gradually from the import to the export, is respectively by the induction zone, interlude and the export section that connect gradually constituteing. The section of the inlet section is a first rounded rectangle, and the length of the first rounded rectangle is changed from small to large; the cross section of the middle section is a combination of a first rounded rectangle and a second rounded rectangle, the second rounded rectangle and the second rounded rectangle form an L shape, and the length of the second circular arc rectangle is changed from small to large. Compared with the prior art, the utility model discloses replace current last stage stator and the superimposed structural style of annular pressurized-water chamber, under the condition that does not increase pump axial dimensions, not only reduced friction loss, widened the high-efficient area of pump, saved the last stage stator moreover, reduced manufacturing cost.
Description
Technical Field
The utility model belongs to the technical field of the multistage pump and specifically relates to a volute type spits out section structure and multistage pump for multistage pump is related to.
Background
The discharge section of the sectional multi-stage pump generally adopts a structure of a final stage guide vane and an annular pumping chamber, as shown in A and B in FIG. 1. However, this structure has the following drawbacks: 1. after flowing out of the final-stage impeller 2, the liquid respectively passes through two hydraulic components, namely a final-stage guide vane and an annular water pumping chamber, in the final-stage guide vane, the liquid is firstly diffused through a positive guide vane to generate diffusion loss, and then two streams of liquid are mixed with each other when entering the annular water pumping chamber from the final-stage guide vane to generate impact loss, so that the liquid flow is relatively disordered, the loss points are multiple, and the energy consumption is high; 2. the structure has two parts, namely a discharge section of the final-stage guide vane and an inner flow passage of the annular pumping chamber, and the discharge section needs to be processed, and the final-stage guide vane needs to be processed, so that materials and manpower are wasted.
Meanwhile, a spiral pressurized water chamber design is often adopted in a single-stage pump to improve the efficiency of the pump. One spiral discharge segment configuration for welded pump bodies, as disclosed in publication No. CN201891668U, is a common spiral design. However, because the axial dimension of the multi-stage pump needs to be shortened as much as possible to ensure the reliable operation of the pump when the multi-stage pump is in use, after a common spiral pumping chamber is adopted, liquid needs to diffuse to two sides after the impeller comes out, and the axial dimension of the pump is inevitably increased in order to ensure smooth water outlet and ensure the throat area, so that the multi-stage pump in the market does not have a spiral discharge section structure at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a section structure and multistage pump are spitted out to spiral case formula for multistage pump in order to overcome the defect that above-mentioned prior art exists, has removed the last stator in the multistage pump under the prerequisite that does not reduce multistage pump availability factor, does not increase the axial dimensions of the pump body simultaneously.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a section structure is told out to spiral case formula for multistage pump, includes the told out section cavity of spiral case formula, and multistage pump's last stage impeller directly links up the import of this told out section cavity, and the exit linkage multistage pump of told out section cavity exports, told out section cavity cross-section from import to export grow gradually, be respectively by the induction zone, interlude and the export section that connect gradually and constitute, wherein:
the section of the inlet section is a first rounded rectangle, and the length of the first rounded rectangle is changed from small to large in sequence;
the section of the middle section is a combination of a first rounded rectangle and a second rounded rectangle, the second rounded rectangle and the second rounded rectangle form an L shape, the vertical joint of the L shape is in circular arc transition, the length of the first rounded rectangle is kept fixed, and the length of the second circular arc rectangle is changed from small to large in sequence.
Further, the section of the outlet section is gradually transited from an L shape to a circle.
Furthermore, the ratio of the base circle diameter D3 of the spitting section cavity to the impeller outer diameter D2 is 1.02-1.06.
Furthermore, the setting angle of the separation tongue of the cavity of the discharge section is 30-50 degrees.
Furthermore, the width of the inlet is 5-8 mm wider than that of the outlet of the impeller.
Further, in the cross section of the inlet section, the section inlet cross section of the inlet section is 1/3 of the section outlet cross section area, and the right middle cross section of the inlet section is 2/3 of the section outlet cross section area.
Further, still include balanced cover mounting hole, this balanced cover mounting hole and spit out section cavity and set up with axle center.
A multistage pump is provided with the volute type discharge section structure.
Compared with the prior art, the utility model discloses following beneficial effect has.
1. The utility model discloses having carried out unique design and having replaced current last stage stator and the superimposed structural style of annular pressurized-water chamber to volute type discharge section cavity, not only saved a large amount of flow areas, reduced frictional loss, rivers that come out in the impeller no longer strike with a plurality of stator positive vanes mutually moreover, and the efficiency decline amplitude when skew design operating mode point reduces, the high-efficient district of widening pump. Meanwhile, the cavity hydraulic design with the axial variable cross section can be completely embedded into the space of the original annular pumping chamber, and the axial size of the pump is not increased.
2. In the cross section of the inlet section, the section of the inlet section is 1/3 of the section area of the outlet of the section, and the right middle section of the inlet section is 2/3 of the section area of the outlet of the section, so that the pressure in the cavity of the discharge section is uniformly changed and the loss is small under the condition that the radial size of the pump is not changed.
3. The last stage guide vane is removed, the material and processing cost of a part are saved, and the method has better economic benefit during mass production.
Drawings
Fig. 1 is a schematic structural view of a conventional multistage pump.
Fig. 2 is a schematic structural view of the multistage pump of the present invention.
Fig. 3 is a schematic structural view of the ejection section.
Fig. 4 is a schematic front view of the cavity of the spitting section.
Fig. 5 is a schematic perspective view of the cavity of the spitting section.
Fig. 6 is a schematic view of sections I-III in fig. 4 and 5.
Fig. 7 is a schematic view of sections IV-VIII in fig. 4 and 5.
Fig. 8 is a schematic view of section IX in fig. 4 and 5.
Fig. 9 is a schematic view of section X in fig. 4 and 5.
Reference numerals: 1. a cavity of the discharge section 11, an inlet section 12, a middle section 13, an outlet section 2, a final-stage impeller 3 and a mounting hole of the balance sleeve
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 2 and 3, the present embodiment provides a volute type discharge section structure for a multistage pump, which is installed in a certain type of multistage pump. The volute type spitting section structure comprises a volute type spitting section cavity 1. The last-stage impeller 2 of the multi-stage pump is directly connected with the inlet of the spitting section cavity 1, and the outlet of the spitting section cavity 1 is connected with the outlet of the multi-stage pump.
As shown in fig. 4 and 5, the specific structure of the spitting-section cavity 1 is composed of an inlet section 11, a middle section 12 and an outlet section 13 which are connected in sequence, so that the section of the spitting-section cavity 1 is gradually enlarged from the inlet to the outlet. In the drawing of the embodiment, the cavity of the spitting section is divided into eight sections, wherein the section III is the adjacent section of the inlet section 11 and the middle section 12; section IX is the adjacent cross-section of the intermediate section 12 and the outlet section 13.
As shown in fig. 6, the cross section of the inlet section 11 is a first rounded rectangle, and the length of the first rounded rectangle changes from small to large. In the cross-section of inducer 1, the section of the inducer 11 at the inlet of the section (section I) is 1/3 of the area of the section outlet cross-section (section III), and the median cross-section of the inducer 11 (section II) is 2/3 of the area of the section outlet cross-section (section III).
As shown in fig. 7, the cross section of the middle section 12 is a combination of a first rounded rectangle and a second rounded rectangle, the second rounded rectangle and the second rounded rectangle form an "L" shape, and the vertical connection of the two rectangles adopts an arc transition. The length L1 of the first rounded rectangle is kept constant, and the length L2 of the second rounded rectangle is changed from small to large. In the intermediate section 12, the radial dimensions of the inner and outer walls of sections IV and VIII are all equal, Φ D4 and Φ D5. Wherein Φ D5 is determined according to the inner diameter of the middle section of the multi-stage pump; the dimension Φ D4 is determined by the structural dimensions of the multi-stage pump balance sleeve. The VIII cross section area is determined by adopting a speed coefficient method, and the calculation method is the same as that of a common volute pressurized water chamber, so that the detailed description is omitted. Other cross-sectional area calculations were determined according to VII-7/8, VI-6/8, V-5/8, and IV-4/8.
As shown in fig. 8, the cross-section of the outlet section 13 gradually transitions from an "L" shape to a circular shape. The outlet section 13 is also a diffusion section, and the angle of the diffusion section needs to be ensured to be between 7 and 13 degrees, so that the phenomenon of flow separation is avoided, and the hydraulic efficiency is ensured. In the outlet section 13, the area of the sections IX and X is related to the diameter of the multi-stage pump outlet flange, while it is necessary to ensure that the cross-section varies uniformly in area.
From the overall structure of the discharge section cavity 1: the ratio of the base diameter D3 of the discharge section cavity 1 to the impeller outer diameter D2 is K1, and can be generally selected from Table 1.
TABLE 1 coefficient of ratio K of base circle of cavity of discharge section to outer diameter of impeller1(nsSpecific speed of rotation)
| ns | 60～120 | 120～210 |
| K1 | 1.02～1.03 | 1.03～1.06 |
The inlet width B3 is related to the impeller outlet width B2, and in order to prevent the rapid performance reduction caused by the dislocation of the impeller flow passage and the cavity inlet flow passage caused by manufacturing and processing errors, the B3 is B2+ 5-8 mm, and small values are obtained for small pumps and medium pumps, and large values are obtained for large multi-stage pumps.
The baffle setting angle psi 0 is related to the specific speed ns of the multi-stage pump and can be selected according to table 2. The appropriate mounting angle psi 0 of the partition is selected to minimize the impact loss of the liquid against the partition.
TABLE 2 set Angle psi 0 for partition tongue in units °
| ns | 60～130 | 130～210 |
| ψ0 | 30～40 | 40～50 |
This embodiment still includes balanced cover mounting hole 3, and this balanced cover mounting hole 3 sets up with spitting section cavity 1 coaxial heart, improves the stability of the pump body when liquid moves in spitting section cavity 1.
The working principle of the embodiment is as follows:
liquid is thrown around the pumping chamber from the last-stage impeller 2 after being pressurized step by the impeller and enters the cavity 1 of the spitting section. The section I-III of the spitting section forms a spiral channel, the section VI-VIII forms an annular channel, the two parts of channels are combined to collect liquid, and part of kinetic energy of the liquid is converted into pressure energy. From this, this embodiment has replaced current last stage stator and the superimposed structural style of annular pressurized-water chamber, has not only saved a large amount of flow areas, has reduced friction loss, and the rivers that come out in the impeller no longer impact mutually with a plurality of stator positive vanes moreover, and the efficiency reduction amplitude when deviating from the design operating mode point reduces, widens the high-efficient district of pump. Meanwhile, the cavity hydraulic design with the axial variable cross section can be completely embedded into the space of the original annular pumping chamber, and the axial size of the pump is not increased.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. The utility model provides a section structure is told out to spiral case formula for multistage pump, its characterized in that, including the told out section cavity (1) of spiral case formula, the last stage impeller (2) direct connection of multistage pump should spit out the import of section cavity (1), spit out the export of section cavity (1) and connect the export of multistage pump, spit out section cavity (1) cross-section from import to export grow gradually, be respectively by the inducer (11), interlude (12) and export section (13) that connect gradually and constitute, wherein:
the section of the inlet section (11) is a first rounded rectangle, and the length of the first rounded rectangle is changed from small to large in sequence;
the section of the middle section (12) is a combination of a first rounded rectangle and a second rounded rectangle, the second rounded rectangle and the second rounded rectangle form an L shape, the vertical joint of the L shape is in circular arc transition, the length of the first rounded rectangle is kept fixed, and the length of the second circular rectangle is changed from small to large in sequence.
2. Volute discharge section construction for a multistage pump according to claim 1, characterized in that the cross-section of the outlet section (13) gradually transitions from "L" to circular.
3. The volute type discharge section structure for the multistage pump according to claim 1, wherein the ratio of the base diameter D3 of the discharge section cavity (1) to the impeller outer diameter D2 is 1.02-1.06.
4. The volute type discharge section structure for the multistage pump according to claim 1, wherein the partition tongue placement angle of the discharge section cavity (1) is 30-50 degrees.
5. The volute discharge section structure for a multistage pump as claimed in claim 1, wherein the inlet width is 5-8 mm wider than the impeller outlet width.
6. The volute spitting section structure for a multistage pump according to claim 1, wherein the cross-section of the inlet section (11) is such that the section inlet cross-section of the inlet section (11) is 1/3 of the section outlet cross-sectional area, and the right middle cross-section of the inlet section (11) is 2/3 of the section outlet cross-sectional area.
7. The volute discharge section structure for a multi-stage pump according to claim 1, further comprising a balance sleeve mounting hole (3), wherein the balance sleeve mounting hole (3) and the discharge section cavity (1) are coaxially disposed.
8. A multistage pump characterized by being equipped with the volute type discharge section structure as set forth in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021809238.6U CN212536242U (en) | 2020-08-26 | 2020-08-26 | Volute type discharging section structure for multi-stage pump and multi-stage pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021809238.6U CN212536242U (en) | 2020-08-26 | 2020-08-26 | Volute type discharging section structure for multi-stage pump and multi-stage pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212536242U true CN212536242U (en) | 2021-02-12 |
Family
ID=74528210
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021809238.6U Active CN212536242U (en) | 2020-08-26 | 2020-08-26 | Volute type discharging section structure for multi-stage pump and multi-stage pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212536242U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109906A (en) * | 2020-08-26 | 2022-03-01 | 上海连成（集团）有限公司 | Volute type discharging section structure for multi-stage pump and multi-stage pump |
-
2020
- 2020-08-26 CN CN202021809238.6U patent/CN212536242U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114109906A (en) * | 2020-08-26 | 2022-03-01 | 上海连成（集团）有限公司 | Volute type discharging section structure for multi-stage pump and multi-stage pump |
| CN114109906B (en) * | 2020-08-26 | 2024-09-20 | 上海连成（集团）有限公司 | Volute type discharge section structure for multistage pump and multistage pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113236607B (en) | Design method of large-scale engineering pump volute and volute thereof | |
| CN108361205B (en) | Centrifugal pump impeller and LNG immersed pump comprising same | |
| CN103557166B (en) | A kind of multistage centrifugal compressor | |
| CN106837821A (en) | Low noise binary self-priming combination pump | |
| CN212536242U (en) | Volute type discharging section structure for multi-stage pump and multi-stage pump | |
| CN201696302U (en) | Horizontal radial multi-stage centrifugal pump | |
| CN212225601U (en) | High-efficiency energy-saving centrifugal pump | |
| CN210484178U (en) | Combined guide vane type pump | |
| CN211039075U (en) | Low-temperature immersed pump with guide vane ring inside | |
| CN101344059A (en) | Reverse S type runner of mixed-flow turbine | |
| CN107120314A (en) | Axle envelope formula core main pump pumping chamber | |
| CN114109906A (en) | Volute type discharging section structure for multi-stage pump and multi-stage pump | |
| CN106762678A (en) | A kind of horizontal middle open type parallel connection multistage pump | |
| CN2276572Y (en) | Segmental opposed voluted type multistage slag thick liquid pump | |
| CN202510422U (en) | High-flow high-pressure centrifugal fan | |
| CN110043476A (en) | Constant pressure turbulence pump | |
| CN212717187U (en) | Single-stage single-suction horizontal split pump | |
| CN109113870A (en) | A kind of diffuser, compressor and combustion gas turbine | |
| CN205937140U (en) | Double feed inlet self -balancing multistage centrifugal pump of chopped -off head double suction impeller | |
| CN212296896U (en) | Double-suction type full-symmetry multistage pump | |
| CN212360289U (en) | High-pressure efficient centrifugal impeller | |
| CN209539573U (en) | A kind of efficient two stage centrifugal regeneration pump | |
| CN209041167U (en) | A kind of S type twist blade formula blade wheel structure | |
| CN208749451U (en) | A kind of diffuser, compressor and combustion gas turbine | |
| CN208221177U (en) | A kind of shunting centrifugal impeller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |