CN111102238A - Anti-cavitation impeller and water pump - Google Patents
Anti-cavitation impeller and water pump Download PDFInfo
- Publication number
- CN111102238A CN111102238A CN201911341041.6A CN201911341041A CN111102238A CN 111102238 A CN111102238 A CN 111102238A CN 201911341041 A CN201911341041 A CN 201911341041A CN 111102238 A CN111102238 A CN 111102238A
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- China
- Prior art keywords
- impeller
- cavitation
- hub
- chamber
- blade
- 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.)
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Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 230000008676 import Effects 0.000 claims 2
- 230000008016 vaporization Effects 0.000 abstract description 6
- 238000009834 vaporization Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- 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
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/688—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses an anti-cavitation impeller and a water pump, wherein the anti-cavitation impeller comprises a hub, a plurality of blades, a liquid inlet and a liquid outlet, the blades comprise blade inlets, the anti-cavitation impeller also comprises a first cavity and a balance hole, and the balance hole is arranged on the back of each blade and is close to the blade inlets; the hub is provided with a pump cover, the pump cover and the hub form a first cavity, the hub is provided with a first baffle, and the pump cover is provided with a second baffle which is sleeved on the first baffle to form the first cavity; a gap is arranged between the first baffle and the second baffle; the anti-cavitation impeller is arranged in the volute, the volute is provided with a second chamber, and the second chamber is communicated with the first chamber through a gap; the balance hole is formed in the hub. Compared with the prior art, the invention arranges the balance hole at one side of the back of the blade and close to the inlet of the blade, thereby improving the pressure at the inlet of the blade, avoiding the pressure of liquid from reaching the vaporization pressure, avoiding the generation of bubbles and fundamentally solving the generation of cavitation.
Description
Technical Field
The invention relates to the field of water pumps, in particular to an anti-cavitation impeller and a water pump.
Background
During operation of the pump, when the absolute pressure of the pumped liquid drops to the vaporization pressure at the prevailing temperature in a local region of the flow-through section, the liquid starts to vaporize there, whereupon vapor is generated and bubbles are formed. When the bubbles flow to a high-pressure place along with the liquid, the high-pressure liquid around the bubbles rapidly reduces the bubbles until the bubbles break, and when the bubbles break and condense, liquid particles fill cavities at high speed, and impact each other to form water hammer, so that the overflowing component is corroded and damaged. The process by which the flow components are destroyed by the product bubbles and bubble breakages is the cavitation process in the pump. Certain areas on the flow components can be subject to corrosion damage when the pump is operated for extended periods of time under cavitation conditions. When the bubbles are broken and condensed, the surface of the wall surface of the flow passage component is strongly impacted, the pressure born by the surface reaches 49MPa, so that the surface of the wall surface of the flow passage component has pockmarks or even perforations, metal crystal grains are loosened and peeled off to be honeycomb-shaped when the surface is serious, the cavitation damage is accompanied with various complex actions such as electrolysis, chemical corrosion and the like besides the mechanical force action, the bubbles are often broken at the outlet of the impeller and the inlet of the pressure water chamber, but the bubbles are generated in the low-pressure area of the inlet of the blade and are broken at the outlet of the impeller or in the shell. To avoid cavitation, it is necessary to prevent the generation of bubbles at the impeller inlet, and it is important to design the generation site of bubbles so as to avoid vaporization of the fluid.
Disclosure of Invention
The invention provides an anti-cavitation impeller and a water pump, which effectively solve the problem of serious cavitation of the existing impeller.
The technical scheme adopted by the invention is as follows: the invention provides an anti-cavitation impeller, which comprises a liquid inlet, a liquid outlet, a blade inlet, a first cavity communicated with the liquid outlet and a balance hole communicated with the first cavity and the liquid inlet, wherein the balance hole is formed in one side of the back face of the blade and is close to the blade inlet.
Further, the number of the balancing holes does not exceed the number of the blades.
Further, the balance holes are uniformly distributed along the circumferential direction of the impeller.
Furthermore, the anti-cavitation impeller further comprises a hub, the blades are arranged on one side of the hub, a pump cover is arranged on the other side of the hub, and the pump cover and the hub form the first cavity.
Furthermore, an annular first baffle plate is arranged on the other side of the hub, and an annular second baffle plate which is sleeved on the inner side or the outer side of the first baffle plate to form the first cavity is arranged on the pump cover.
Further, a gap for liquid to pass through is arranged between the first baffle and the second baffle.
Further, a liquid outlet is formed between adjacent blades, and liquid flows out of the liquid outlet and enters the second chamber.
Further, the anti-cavitation impeller is arranged in a volute, the volute is provided with the second chamber, and the second chamber is communicated with the first chamber through a gap.
Further, the balance hole is formed in the hub.
A water pump comprising the anti-cavitation impeller.
Compared with the prior art, the invention provides the anti-cavitation impeller and the water pump, the balance hole is arranged on the back of the blade and is close to the inlet position of the blade, namely the balance hole is arranged at the position of the inlet of the blade, and because the pressure at the inlet of the blade is lower, the liquid in the first chamber flows into the inlet position of the blade from the balance hole under the action of pressure difference, the pressure at the inlet of the blade is further improved, the pressure of the liquid is prevented from reaching the vaporization pressure, the generation of cavitation is avoided, and the occurrence of cavitation is fundamentally solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic cross-sectional view of an anti-cavitation impeller according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a schematic partial structure of a working surface of an anti-cavitation impeller in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a partial cross-sectional structure of a water pump according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 and 2, the present invention provides an anti-cavitation impeller, which mainly includes a shroud 1, blades 2 and a hub 3, wherein the hub 3 is disc-shaped, a plurality of blades 2 are arranged on the left side of the hub 3 in a standing manner, the shroud 1 covers the blades 2, the blades 2 include a back 21 and a working face 22, the back of the front blade 2 and the working face of the rear blade 2 are arranged opposite to each other and allow liquid to pass through, and the shroud 1 and the hub 3 sandwich the plurality of blades 2 to form a liquid outlet 8 from which the liquid flows out.
Further, the middle part of the hub 3 is connected with a motor rotating shaft, the motor rotating shaft rotates and drives the motor rotating shaft to rotate together, a circular opening is formed in the middle part of the wheel cover 1, a circle of annular convex wall 11 is arranged outside the opening, the opening is a liquid inlet 41 of the impeller, when the impeller rotates, liquid flows into the impeller from the opening and flows out of the impeller from a liquid outlet 8, and therefore one end (the end close to the opening) of the blade 2 where the liquid flows in is a blade inlet.
As shown in fig. 3, the present invention further provides a water pump, which includes the anti-cavitation impeller, wherein the anti-cavitation impeller is installed in the volute 4, and a pump cover 5 is provided at one side of the volute 4 to form a structure with an inner cavity in combination with the volute 4.
Further, the pump cover 5 is arranged on the right side of the hub 3 and forms a first cavity 6 with the hub 3, a balance hole 7 communicating the first cavity 6 with a liquid inlet 41 on the left side of the hub 3 is further arranged on the anti-cavitation impeller, the balance hole 7 is specifically arranged on the hub, the balance hole 7 is arranged close to the back 21 of the blade 2, the balance hole 7 is close to the position of the blade inlet, namely the balance hole 7 is arranged at the position of generating bubbles on the back of the blade inlet, and due to the fact that the pressure on the back of the blade inlet is low, liquid in the first cavity 6 flows into the blade inlet from the balance hole 7 under the effect of pressure difference, the pressure on the blade inlet is further improved, the pressure of the liquid is prevented from reaching vaporization pressure, the generation of cavitation is avoided, and the occurrence of cavitation is fundamentally solved.
Specifically, an opening communicated with the liquid inlet 41 is formed in the left side of the volute 4, an anti-cavitation impeller (hereinafter referred to as an impeller) is installed inside the volute 4, a wheel cover 1 of the impeller is arranged towards the liquid inlet 41, and the convex wall 11 and the volute 4 form a front seal; the impeller is installed inside the volute 4, and the inside of the volute 4 is also provided with a second chamber 42, the second chamber 42 is communicated with the liquid outlet 8, when the impeller rotates, the inlet of the impeller is a low-pressure area, liquid is sucked from the liquid inlet 41 and discharged from the liquid outlet 8 into the second chamber 42, the liquid in the second chamber 42 leaks into the first chamber 6, the liquid in the first chamber 6 is merged with the water flow of the liquid inlet 41 from the balance hole 7, and at the moment, the pressure in the first chamber 6 is between the pressures of the second chamber 42 and the liquid inlet 41, and by means of the arrangement, the pressure in the first chamber 6 can be effectively reduced, so that the axial force of the water pump is reduced.
Further, the impeller in this embodiment includes a plurality of blades 2, a balance hole 7 is correspondingly provided on the back of each blade 2 and near the inlet, and the balance holes 7 are uniformly distributed along the circumference of the impeller to balance the weight of the impeller and avoid the vibration caused by uneven stress on the impeller. It should be noted that, in the present invention, the number of the balancing holes is less than or equal to the number of the blades, and the balancing holes are uniformly distributed along the circumference of the impeller, so that the radial force received by the water pump due to the unbalanced rotor mass during operation is minimized.
Further, in the present embodiment, the first chamber 6 is formed by the hub 3 and the pump cover 5, the right side of the hub 3 is provided with the annular first baffle plate 31, the pump cover 5 is also provided with the annular second baffle plate 51 which is arranged towards the first baffle plate 31, the diameter of the second baffle plate 51 is slightly larger than that of the first baffle plate 31, the second baffle plate 51 is sleeved outside the first baffle plate 31 to form the first chamber 6, the first chamber 6 is arranged in the middle of the hub 3, the motor rotating shaft 9 passes through the pump cover 5 and the first chamber 6 to be rotatably connected with the impeller, the impeller and the pump cover 5 relatively rotate to form a gap between the first baffle plate 31 and the second baffle plate 51, so that the pressure in the first chamber 6 approaches to the high pressure in the chamber 42, the balancing hole reduces the pressure in the first chamber 6, the balancing hole communicates the first chamber 6 with the inlet area of the impeller, and finally the pressure in the first chamber 6 is between the chamber 42 and the inlet of the impeller, thereby improving the pressure at the inlet of the blade, avoiding the pressure of the liquid from reaching the vaporization pressure, avoiding the generation of bubbles and fundamentally solving the problem of cavitation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides an anti cavitation impeller, includes inlet, liquid outlet and blade import, its characterized in that, still include with the first cavity of liquid outlet intercommunication and intercommunication the balancing hole of first cavity and inlet, the balancing hole is located back one side of blade just is close to the blade import.
2. The anti-cavitation impeller of claim 1, wherein the number of balancing holes does not exceed the number of blades.
3. The anti-cavitation impeller of claim 2, wherein the balancing holes are evenly distributed along a circumferential direction of the impeller.
4. The anti-cavitation impeller of claim 1 further comprising a hub, the blades being disposed on one side of the hub, the other side of the hub being provided with a pump cover, the pump cover and the hub forming the first chamber.
5. The anti-cavitation impeller of claim 4, wherein the other side of the hub is provided with an annular first baffle plate, and the pump cover is provided with an annular second baffle plate which is sleeved on the inner side or the outer side of the first baffle plate to form the first chamber.
6. The anti-cavitation impeller of claim 5, wherein the first and second baffles include a gap therebetween through which liquid passes.
7. The cavitation-resistant impeller of claim 1, wherein a liquid outlet is formed between adjacent ones of the blades, liquid flowing from the liquid outlet into the second chamber.
8. An anti-cavitation impeller in accordance with claim 7, wherein the anti-cavitation impeller is provided in a volute provided with the second chamber, the second chamber communicating with the first chamber through a gap.
9. The anti-cavitation impeller of claim 4, wherein the balancing holes are provided on the hub.
10. A water pump comprising an anti-cavitation impeller as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341041.6A CN111102238A (en) | 2019-12-23 | 2019-12-23 | Anti-cavitation impeller and water pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911341041.6A CN111102238A (en) | 2019-12-23 | 2019-12-23 | Anti-cavitation impeller and water pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111102238A true CN111102238A (en) | 2020-05-05 |
Family
ID=70423982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911341041.6A Withdrawn CN111102238A (en) | 2019-12-23 | 2019-12-23 | Anti-cavitation impeller and water pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111102238A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009115047A (en) * | 2007-11-09 | 2009-05-28 | Hitachi Plant Technologies Ltd | Pump fluid machinery |
| CN102003408A (en) * | 2010-05-07 | 2011-04-06 | 江苏大学 | Low specific speed centrifugal impeller with radial backflow holes |
| CN206129690U (en) * | 2016-09-26 | 2017-04-26 | 江铃汽车股份有限公司 | Cavitation resistance engine water pump structure |
| CN110469539A (en) * | 2019-09-03 | 2019-11-19 | 珠海格力电器股份有限公司 | Impeller, centrifugal pump and air-conditioning |
| CN110566470A (en) * | 2019-09-19 | 2019-12-13 | 江苏大学 | High-efficient low noise automotive electronics water pump |
-
2019
- 2019-12-23 CN CN201911341041.6A patent/CN111102238A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009115047A (en) * | 2007-11-09 | 2009-05-28 | Hitachi Plant Technologies Ltd | Pump fluid machinery |
| CN102003408A (en) * | 2010-05-07 | 2011-04-06 | 江苏大学 | Low specific speed centrifugal impeller with radial backflow holes |
| CN206129690U (en) * | 2016-09-26 | 2017-04-26 | 江铃汽车股份有限公司 | Cavitation resistance engine water pump structure |
| CN110469539A (en) * | 2019-09-03 | 2019-11-19 | 珠海格力电器股份有限公司 | Impeller, centrifugal pump and air-conditioning |
| CN110566470A (en) * | 2019-09-19 | 2019-12-13 | 江苏大学 | High-efficient low noise automotive electronics water pump |
Non-Patent Citations (1)
| Title |
|---|
| 沈阳水泵研究所: "《叶片泵设计手册》", 31 July 1983 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200505 |
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| WW01 | Invention patent application withdrawn after publication |