CN116181664A - Deep well pump and flow guiding structure thereof - Google Patents
Deep well pump and flow guiding structure thereof Download PDFInfo
- Publication number
- CN116181664A CN116181664A CN202211281431.0A CN202211281431A CN116181664A CN 116181664 A CN116181664 A CN 116181664A CN 202211281431 A CN202211281431 A CN 202211281431A CN 116181664 A CN116181664 A CN 116181664A
- Authority
- CN
- China
- Prior art keywords
- flow
- diversion
- impeller
- well pump
- 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.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
- F04D13/10—Units comprising pumps and their driving means the pump being electrically driven for submerged use adapted for use in mining bore holes
-
- 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
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
-
- 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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
- F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a deep well pump diversion structure, which comprises an impeller and a diversion body, wherein the impeller and the diversion body are arranged in a diversion seat, and an annular water inlet is formed between the circumferential edge of the diversion body and the inner wall of the diversion seat; the outlet of the impeller is opposite to the annular water inlet, and the guide seat is internally provided with a medium guide channel which is converged from the outlet to the annular water inlet and flows out through the upper end face of the guide body. The impeller rotates in the guide seat to pump water, the pump water is sent into the top of the guide body through the annular water inlet and then is discharged, the annular water inlet is formed at the circumferential edge of the guide body, the outlet of the impeller is directly opposite to the annular water inlet, water flow pumped by the impeller is directly sprayed out towards the annular water inlet when the pump water is pumped, the pump water is converged and guided to the upper end face of the guide body after being circumferentially arranged at the annular water inlet, the pump water can directly flow into the top surface of the guide body by arranging a medium guide channel in the guide seat into a mode of directly swirling the pump water of the impeller, the energy loss of the pump water is reduced, and the large-flow pump water of the impeller in the guide seat can be realized. The invention also provides a deep well pump.
Description
Technical Field
The invention relates to the technical field of deep-well pumps, in particular to a deep-well pump and a diversion structure thereof.
Background
The deep well pump is a pump which is integrated with a motor and a pump, is immersed in an underground water well to suck and convey water, and is widely applied to farmland drainage, industrial and mining enterprises, urban water supply and drainage, sewage treatment and the like.
A multistage transmission matched flow guide seat is arranged in a pump body of the deep well pump, pump water flow guide is carried out by matching of an impeller in the flow guide seat and a flow guide body, and finally the pump water is discharged through a pump water outlet at the top of the pump body. The impeller rotates to output water flow in a rotational flow mode, a circle of rudder blades are arranged on the bottom surface of the guide body and are opposite to the outlet of the impeller, and the impeller discharge water flow is guided by the rudder blades in a rotational flow mode, is sent into the top of the guide body and is finally discharged. For the large-flow deep-well pump, the existing water pumping diversion structure of the impeller and the diversion body ensures the rotational flow conveying of water flow, but limits the conveying kinetic energy of the water flow, and is difficult to meet the water pumping requirement of the large-flow deep-well pump.
Disclosure of Invention
In view of the above, the present invention provides a diversion structure of a deep-well pump to realize the requirement of high-flow pumping water of the deep-well pump; the invention also provides a deep well pump.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the deep well pump diversion structure comprises an impeller and a diversion body which are arranged in a diversion seat, wherein an annular water inlet is formed between the circumferential edge of the diversion body and the inner wall of the diversion seat;
the discharge port of the impeller is arranged opposite to the annular water inlet, and a medium diversion channel which is converged from the discharge port to the annular water inlet and flows out through the upper end face of the diversion body is arranged in the diversion seat.
Preferably, in the above deep well pump diversion structure, the inner wall of the diversion seat is provided with a diversion cambered surface communicated to the upper end surface of the diversion body by the discharge outlet, and the lower edge of the discharge outlet of the impeller is connected with the diversion cambered surface.
Preferably, in the above deep well pump diversion structure, the outlet of the impeller has a first flow height, the annular water inlet has a second flow width, the first flow height is larger than the second flow width, and the flow area of the medium diversion channel gradually decreases from the first flow height position to the second flow width position.
Preferably, in the above deep well pump diversion structure, the water inlet of the diversion body has a third flow-through height, the second flow-through width is smaller than the third flow-through height, and the flow area of the medium flow channel from the second flow-through width position to the third flow-through height position is gradually increased.
Preferably, in the above deep well pump diversion structure, the second flow width/first flow height is 0.4-0.6; the second flow width/third flow height is 0.4-0.6.
Preferably, in the above deep-well pump diversion structure, the second flow width/first flow height is 0.5; the second flow width/third flow height is 0.5.
Preferably, in the above deep well pump diversion structure, the outlet of the impeller has a diversion inclination angle towards the diversion cambered surface of the diversion seat, and the upper end face and the lower end face of the outlet of the impeller are both arranged towards the diversion cambered surface.
Preferably, in the above-mentioned deep-well pump flow guiding structure, the extension of the upper end surface of the impeller discharge port in the radial direction is shorter than the length of the lower end surface of the impeller.
The deep-well pump comprises a pump body, wherein a plurality of groups of diversion structures matched with each other by impeller shafts in a transmission way are arranged in the pump body, and the deep-well pump is characterized in that the diversion structure of the deep-well pump is arranged between an impeller of the diversion structure and a diversion body.
The invention provides a deep well pump diversion structure, which comprises an impeller and a diversion body, wherein the impeller and the diversion body are arranged in a diversion seat, and an annular water inlet is formed between the circumferential edge of the diversion body and the inner wall of the diversion seat; the outlet of the impeller is opposite to the annular water inlet, and the guide seat is internally provided with a medium guide channel which is converged from the outlet to the annular water inlet and flows out through the upper end face of the guide body. The impeller rotates in the guide seat to pump water, the pump water is sent into the top of the guide body through the annular water inlet and then is discharged, the annular water inlet is formed at the circumferential edge of the guide body, the outlet of the impeller is directly opposite to the annular water inlet, water flow pumped by the impeller is directly sprayed out towards the annular water inlet when the pump water is pumped, the pump water is converged and guided to the upper end face of the guide body after being circumferentially arranged at the annular water inlet, the pump water can directly flow into the top surface of the guide body by arranging a medium guide channel in the guide seat into a mode of directly swirling the pump water of the impeller, the energy loss of the pump water is reduced, and the large-flow pump water of the impeller in the guide seat can be realized.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a deep well pump diversion structure provided by the invention;
fig. 2 is a schematic structural diagram of the flow guide body in fig. 1.
Detailed Description
The invention discloses a diversion structure of a deep-well pump, which meets the requirement of large-flow pumping water of the deep-well pump; the invention also provides a deep well pump.
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, the invention provides a cross-sectional view of a diversion structure of a deep-well pump; fig. 2 is a schematic structural diagram of the flow guide body in fig. 1.
The present embodiment provides a deep well pump diversion structure, impeller 61 and diversion body 62 are arranged in diversion seat 6, diversion cambered surface 601 for diversion of water flow discharged by impeller 61 onto diversion body 62 is arranged on the inner wall of diversion seat 6, annular water inlet is defined between circumferential edge of diversion body 62 and diversion cambered surface 601, lower edge of discharge outlet of impeller 61 is connected with diversion cambered surface 601, upper edge of discharge outlet of impeller 61 is connected with bottom edge of diversion body 62, discharge outlet of impeller 61 is formed in diversion seat 6, medium diversion channel is communicated with top surface of diversion body 62 via annular water inlet.
Compared with the existing impeller flow guiding structure, the edge of the impeller 61 is connected with the flow guiding cambered surface 601 of the flow guiding seat 6, and the rudder blade is canceled from the lower end surface of the flow guiding body 62, so that when the impeller 61 pumps water, the pumped water flow directly impacts the flow guiding cambered surface 601 of the inner end surface of the flow guiding seat 6, is conveyed to the upper surface of the flow guiding body 62 by the impeller 61 through the direction change of the flow guiding cambered surface 601, and the pumped water flow pumped by the impeller 61 is blocked by the rudder blade, so that the pumped water can obtain larger pumping kinetic energy, and the pumping water flow requirement of the large-displacement deep well pump is met.
The impeller 61 rotates in the guide seat 6 to pump water, the pump water is sent into the top of the guide body 62 through the annular water inlet and then is discharged, the circumferential edge of the guide body 62 forms an annular water inlet, the discharge outlet of the impeller 61 is directly opposite to the annular water inlet, when the pump water is pumped, the water pumped by the impeller 61 is directly sprayed out towards the annular water inlet, the pump water is converged and guided to the upper end face of the guide body 62 after being circumferentially distributed in the annular water inlet, and the pump water can directly flow into the top surface of the guide body 62 by setting a medium guide channel in the guide seat 6 as a mode of directly swirling the pump water of the impeller 61, so that the energy loss of the pump water is reduced, and the large-flow pump water of the impeller in the guide seat can be realized.
Further, the first flow-through height H1 of the discharge port of the impeller 61 to the second flow-through width H2 of the annular water inlet, the first flow-through height H1 being larger than the second flow-through width H2, and the flow area gradually decreasing in the flow-through direction. The impeller 61 pump water is discharged through the discharge port and has certain water flow kinetic energy, the water flow gradually becomes smaller along with the circulation height, and the water flow is in a rotational flow mode, flows into the second circulation width H2 through the position of the first circulation height H1, and can be converted to enable the water flow speed to be further increased, so that the flow speed of the lower portion of the diversion cambered surface 601 is increased, the rotational flow effect is enhanced, the water flow is further extruded, smoothly passes through the annular water inlet, and higher water flow energy is kept.
Further, the water inlet of the flow guide 62 has a third flow-through height H3, and the second flow-through width H2 is smaller than the third flow-through height H3, and the flow area in the flow-through direction becomes gradually larger. The water flows through the annular water inlet, enters the upper part of the guide body 62, is provided with a diffusion medium guide channel with gradually enlarged water inlet area at the water inlet between the annular water outlet and the guide body 62, gradually reduces the speed of the water flow along with the increase of the section, gradually increases the pressure, and converts the kinetic energy of the water into potential energy. Through the structural adjustment to the water inlet position of the guide body 62, the conversion stability of the kinetic energy and potential energy of the water flow is ensured, the pumping water can be smoothly guided out by the guide body, and the flow of the water pump is ensured.
Through directly facing the discharge port of the impeller 61 to the diversion cambered surface 601, the water pumped by the impeller 61 is directly diverted and circulated to the upper part of the diversion body 62 through the diversion cambered surface 601, and meanwhile, through forming an annular water inlet between the circumference of the diversion body 62 and the diversion cambered surface 601, a medium circulation channel between the discharge port of the impeller 61 and the annular water inlet is in a tapered structure, and through compressing the water circulation height, the water flow velocity is further increased, the rotational flow energy is improved, and the water can smoothly enter the top of the diversion body 62; meanwhile, the top surface of the medium circulation channel is provided with a gradually expanding structure between the annular water inlet and the water inlet of the diversion body 62, so that water flow is decelerated, kinetic energy is converted into potential energy, pumped water can smoothly enter the diversion body to be discharged, and stable water discharge of the high-flow water pump is ensured.
Further, the second flow width H2/the first flow height H1 is 0.4-0.6; the second flow width H2/third flow height H3 is 0.4-0.6. Preferably, H2/H1 is 0.5 and H2/H3 is 0.5. The first flow height H1 is the water outlet height of the outlet of the impeller 61, the third flow height H3 is the water inlet position of the guide body 62, the height between the surface of the guide body 62 and the inner wall surface of the guide seat 6, and the second flow width H2 of the annular water inlet is half of the outlet of the impeller 61 and the water inlet of the guide body, so that the stable rotational flow of the water discharged by the impeller 61 is ensured and is conveyed to the top of the guide body 62, the energy loss in the water circulation process is reduced as much as possible, and the stability of the guide structure of the impeller is improved.
In this embodiment, the discharge port of the impeller 61 has a diversion inclination angle toward the diversion cambered surface 601 for draining water, and both the upper end surface and the lower end surface of the discharge port of the impeller 61 are disposed toward the diversion cambered surface 601. Because the impeller 61 is of a rudder-blade-free structure between the discharge port and the lower surface of the guide body 62, the water flow entering through the discharge port of the impeller 61 and the guide arc surface 601 of the guide seat 6 generate rotational flow, the water flow smoothly enters into the upper part of the guide seat 6 through rotational flow and higher flow velocity, the discharge port of the impeller 61 is provided with an inclined arrangement structure, the radial extension length of the upper end surface of the discharge port of the impeller 61 is shorter than the length of the lower end surface of the impeller 61, the discharge port of the impeller 61 is an inclined discharge port, the direction of the discharge port of the impeller 61 faces towards the annular water inlet, and in order to ensure that the impeller is smoothly installed in the guide seat 62, the lower end surface of the discharge port of the impeller 61 is connected with the bottom edge of the guide arc surface 601, and the water flow flowing out of the lower end surface of the impeller 61 directly enters the guide arc surface 601.
The water flow flowing out of the upper end surface of the impeller 61 mainly enters through the inner ring of the annular water inlet, the water outlet direction of the impeller is towards the diversion cambered surface 601, and the water outlet direction does not exceed the inner ring of the annular water inlet, so that the water flow discharged from the outlet of the impeller 61 is in a trend of extruding into the annular water inlet, the flow blocking effect of the bottom surface of the diversion body 62 on the water outlet of the impeller 61 is reduced, the rotational flow effect is improved, and the smooth inflow of the water flow is ensured.
The first flow-through width H1 as shown in the drawing, the index line thereof can be regarded as an extension line of both the upper end face and the lower end face of the discharge port of the impeller 61, and the extension directions of both extension lines can be regarded as the main outflow direction of the water flow. By arranging the discharge port obliquely, the included angle between the water flow discharged by the impeller 61 and the diversion cambered surface 601 is reduced as much as possible, the water flow can be basically attached to the diversion cambered surface 601, and the energy loss caused by the impact between the discharge port and the diversion cambered surface 601 is reduced.
In this embodiment, the water pumped by the impeller 61 is guided to the upper part of the guide body 62 by the guide seat 6, and pumped out by the guide vane on the guide body 62, for the deep well pump conveyed by the multistage impeller 61, the multistage guide seat 6 with matched water pumping is arranged, the lower end is supported by the inlet seat 102, the top end is provided with the water pumping outlet 2, the impeller shaft 103 rotates to drive the interstage impeller 61 to continuously rotate for pumping water, the interstage guide body pumps the impeller water into the next stage until the topmost guide body 62 is discharged through the water pumping outlet 2. The pump body outlet 2 is provided with a one-way valve for preventing water backflow when the pump body is not pumping water, and the top end of the impeller shaft 103 is provided with a rubber bearing 104 for protection, so that the safety of pumping water is ensured.
The top surface of the guide body 60 is provided with a plurality of spiral guide vanes 620, which guide the water flow sent by the rotational flow, guide the rotational flow upwards while rotating, guide the water flow through the spiral guide vanes 620, pump the water into the water inlet of the guide body 62, guide the water flow out of the water outlet of the guide body at the top of the guide body 62, and the water flow is still in a rotating state after flowing out, and the water flows guided out of the adjacent spiral guide vanes 620 are mutually interfered, so that the guide body 62 is in a trend of pumping upwards after converging, turbulence is formed among the water flows, and the consistency of the water flow is affected.
Based on the diversion structure of the deep-well pump provided by the embodiment, the invention also provides a deep-well pump, which comprises a pump body 1, wherein the outer ring of the pump body 1 is provided with a pump barrel 101, a plurality of groups of diversion structures matched by impeller shaft transmission are arranged in the pump body, the tail end of the outlet of the pump body is provided with a closed valve body, and the diversion structure arranged on the deep-well pump is the diversion structure of the deep-well pump provided by the embodiment.
The deep-well pump adopts the deep-well pump diversion structure of the embodiment, so that the deep-well pump has the beneficial effects brought by the deep-well pump diversion structure.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The deep well pump diversion structure is characterized by comprising an impeller and a diversion body which are arranged in a diversion seat, wherein an annular water inlet is formed between the circumferential edge of the diversion body and the inner wall of the diversion seat;
the discharge port of the impeller is arranged opposite to the annular water inlet, and a medium diversion channel which is converged from the discharge port to the annular water inlet and flows out through the upper end face of the diversion body is arranged in the diversion seat.
2. The deep-well pump diversion structure of claim 1, wherein the inner wall of the diversion seat is provided with a diversion cambered surface communicated with the upper end surface of the diversion body through the discharge outlet, and the lower edge of the discharge outlet of the impeller is connected with the diversion cambered surface.
3. The deep well pump diversion structure of claim 2, wherein the impeller discharge outlet has a first flow height, the annular inlet has a second flow width, the first flow height is greater than the second flow width, and the medium diversion channel gradually decreases in flow area from the first flow height position to the second flow width position.
4. The deep well pump diversion structure of claim 3, wherein the water inlet of the diversion body has a third flow-through height, the second flow-through width is smaller than the third flow-through height, and the flow area of the medium flow channel increases gradually from the second flow-through width position to the third flow-through height position.
5. The deep well pump diversion structure of claim 4, wherein the second flow width/first flow height is 0.4-0.6; the second flow width/third flow height is 0.4-0.6.
6. The deep well pump diversion structure of claim 5, wherein the second flow width/first flow height is 0.5; the second flow width/third flow height is 0.5.
7. The deep-well pump flow guiding structure according to any one of claims 1 to 6, wherein the discharge port of the impeller has a flow guiding inclination angle toward a guiding cambered surface of the flow guiding seat, and both an upper end surface and a lower end surface of the discharge port of the impeller are arranged toward the flow guiding cambered surface.
8. The deep-well pump diversion structure of claim 7, wherein the upper end surface of the impeller discharge outlet has a radial extension shorter than the length of the lower end surface of the impeller.
9. A deep-well pump comprising a pump body, wherein a plurality of groups of diversion structures matched by impeller shafts in a transmission way are arranged in the pump body, and the deep-well pump diversion structure as claimed in any one of claims 1-8 is arranged between an impeller and a diversion body of the diversion structure.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211281431.0A CN116181664A (en) | 2022-10-19 | 2022-10-19 | Deep well pump and flow guiding structure thereof |
| PCT/CN2023/123504 WO2024082984A1 (en) | 2022-10-19 | 2023-10-09 | Deep-well pump and flow guide structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211281431.0A CN116181664A (en) | 2022-10-19 | 2022-10-19 | Deep well pump and flow guiding structure thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116181664A true CN116181664A (en) | 2023-05-30 |
Family
ID=86443012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211281431.0A Pending CN116181664A (en) | 2022-10-19 | 2022-10-19 | Deep well pump and flow guiding structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116181664A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082984A1 (en) * | 2022-10-19 | 2024-04-25 | 钱江集团温岭正峰动力有限公司 | Deep-well pump and flow guide structure thereof |
-
2022
- 2022-10-19 CN CN202211281431.0A patent/CN116181664A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082984A1 (en) * | 2022-10-19 | 2024-04-25 | 钱江集团温岭正峰动力有限公司 | Deep-well pump and flow guide structure thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5233436B2 (en) | Centrifugal compressor with vaneless diffuser and vaneless diffuser | |
| US7021890B2 (en) | Turbo pump | |
| CN105041720B (en) | A kind of efficiently quasi- annular pumping chamber Hydraulic Design Method of big overcurrent Turo pump | |
| CN219587797U (en) | Deep well pump and flow guiding structure thereof | |
| CN116181664A (en) | Deep well pump and flow guiding structure thereof | |
| CN106224249A (en) | Low noise self-priming combination pump | |
| KR20150120168A (en) | Centrifugal type mixed flow blower | |
| CN106640667B (en) | A kind of twin-stage double suction centrifugal pump of water conservancy diversion shell-type | |
| CN115479019A (en) | Large flow deep well pump | |
| CN105673571A (en) | Hydraulic design method of efficient large-overflowing rotational flow pump quasi-circular water-compressing chamber | |
| CN111535974A (en) | Low-water-head large-flow mixed-flow water turbine with double-inlet volute | |
| CN109885886B (en) | Hydraulic design method for reducing hump of multi-stage pump head curve | |
| CN219139324U (en) | High-flow deep well pump | |
| WO2024082984A1 (en) | Deep-well pump and flow guide structure thereof | |
| CN218118003U (en) | Large-flow deep-well pump and flow guide body thereof | |
| CN110073112B (en) | Vortex pump | |
| CN110748504A (en) | Hydraulic structure of side runner pump body | |
| CN111255748A (en) | Stall-resistant diffuser | |
| CN211314651U (en) | Hydraulic structure of side runner pump body | |
| CN213270440U (en) | Open impeller and double-suction-port cutting pump with same | |
| CN214464917U (en) | Multistage pump with guide vane wheel | |
| CN220118337U (en) | Centrifugal pump | |
| JP4422438B2 (en) | Vertical shaft pump | |
| CN210660721U (en) | Novel impeller on water pump | |
| KR102578918B1 (en) | Impellerless pump for rainwater pipeline installation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |