CN115573919A - Vertical self-priming pump structure with cavitation and hydraulic performance - Google Patents
Vertical self-priming pump structure with cavitation and hydraulic performance Download PDFInfo
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- CN115573919A CN115573919A CN202211221693.8A CN202211221693A CN115573919A CN 115573919 A CN115573919 A CN 115573919A CN 202211221693 A CN202211221693 A CN 202211221693A CN 115573919 A CN115573919 A CN 115573919A
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- 239000007788 liquid Substances 0.000 claims abstract description 97
- 238000000926 separation method Methods 0.000 claims abstract description 36
- 239000011550 stock solution Substances 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims description 71
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 238000003860 storage Methods 0.000 claims description 19
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000037452 priming Effects 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract description 3
- 230000009471 action Effects 0.000 description 5
- 238000010992 reflux Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000003245 working effect Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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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
- F04D9/00—Priming; Preventing vapour lock
- F04D9/004—Priming of not self-priming pumps
- F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
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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
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/06—Multi-stage 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
- 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
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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
- F04D29/08—Sealings
- F04D29/086—Sealings 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
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention provides a vertical self-priming pump structure with cavitation and hydraulic performance, belongs to the technical field of mechanical pumps, and solves the problems of poor hydraulic performance and serious cavitation of the existing self-priming pump. This compromise vertical self priming pump structure of cavitation and hydraulic performance, including the motor and the pump body, motor and pump body fixed connection, the output shaft end of motor is fixed with the pump shaft, the pump shaft is located inside the pump body, from up being fixed with centrifugal impeller down in proper order on the pump shaft, primary side impeller and secondary side impeller, the stock solution chamber has been seted up to pump body inside, the drainage chamber, the pumping chamber, gas-liquid separation room and sealed chamber, centrifugal impeller is located inside the pumping chamber, the sealed chamber is by primary side impeller, secondary side impeller and closing plate are constituteed, the earial drainage has been seted up on the closing plate, primary side impeller, secondary side impeller, the closing plate, doublestage dynamic seal structure is constituteed with earial drainage hole in sealed discharge hole chamber. The invention has the advantages of improving the hydraulic performance and the cavitation resistance of the self-priming pump.
Description
Technical Field
The invention belongs to the technical field of mechanical pumps, relates to a self-priming pump, and particularly relates to a vertical self-priming pump structure with cavitation and hydraulic performances.
Background
The self-priming pump is a centrifugal pump with self-priming performance, only the pump needs to be pumped when the pump is started for the first time, water is sucked up under the self-action of the pump after short-time operation, the pump does not need to be pumped when the pump is started again, and the self-priming pump has the characteristics of one-time drainage and lifelong self-priming. The self-priming pump has higher applicability on occasions with frequent starting and difficult liquid filling. Compared with a common centrifugal pump, the self-sucking pump has the advantages of simple structure, low manufacturing cost, convenience in disassembly, reliable sealing performance, good self-sucking performance and convenience in remote centralized control, and is widely applied to the fields of agriculture, fire fighting, petrochemical industry, steel smelting, water-saving irrigation, waterlogging drainage, sewage treatment and the like.
The traditional self-priming pump usually adopts auxiliary impeller power seal, and liquid is plugged under the action of centrifugal force generated by rotation of the auxiliary impeller, so that no leakage is realized. The auxiliary impeller does work on the rotation of liquid, the power consumption of the shaft is large, and the efficiency of the self-priming pump is reduced. In addition, in the operation process of the self-sucking pump, the cavitation phenomenon is inevitable, and when the self-sucking pump generates serious cavitation, the hydraulic performance of the pump is reduced, vibration and noise can be generated, and the operation stability of the pump is seriously influenced. Aiming at the defects of the traditional self-priming pump, the structural optimization of the traditional self-priming pump becomes one of the trends of the research and development of the self-priming pump.
Disclosure of Invention
The invention aims to solve the problems in the prior art, provides a vertical self-priming pump structure with cavitation and hydraulic performance, and aims to solve the technical problems that: how to improve the hydraulic performance and the cavitation resistance of the self-priming pump.
The purpose of the invention can be realized by the following technical scheme:
the utility model provides a compromise cavitation and hydraulic performance's vertical self priming pump structure, including the motor and the pump body, motor and pump body fixed connection, the output shaft end of motor is fixed with the pump shaft, the pump shaft is located inside the pump body, from up being fixed with centrifugal impeller, primary side impeller and secondary side impeller from down in proper order on the pump shaft, the liquid storage chamber has been seted up to pump body inside, the drainage chamber, the pressurized-water chamber, gas-liquid separation room and seal chamber, centrifugal impeller is located inside the pressurized-water chamber, the seal chamber comprises primary side impeller, secondary side impeller and closing plate, the discharge orifice has been seted up on the closing plate, primary side impeller, secondary side impeller, the closing plate, seal chamber and discharge orifice constitute sealed chamber inlet gap, the closing plate forms sealed chamber import clearance with the pump shaft, be fixed with inlet tube and outlet pipe on the pump body, the inlet tube communicates with the liquid storage chamber, the export and the gas-liquid separation room of pressurized-water chamber communicate, the backward flow hole is seted up to the pressurized-water chamber side, the export and the outlet pipe intercommunication of gas-liquid separation room, the drainage chamber communicates with the gas-liquid storage chamber communicates through jet hole, the drainage chamber communicates with the drainage hole.
The working principle of the invention is as follows: in the starting stage of the self-priming pump, a certain amount of liquid is stored in the liquid storage cavity and the centrifugal impeller, after the pump is started, air sucked into the water inlet pipe is mixed with liquid in the centrifugal impeller under the rotating action of the centrifugal impeller, the mixed liquid is discharged into the gas-liquid separation chamber through the water pressing chamber, after gas-liquid separation, the gas is discharged from the primary auxiliary impeller and the secondary auxiliary impeller through the inlet gap of the sealing cavity and the discharge hole, and the liquid flows back to the centrifugal impeller through the backflow hole to participate in mixing again until self-priming is completed and normal water discharge is realized; at the moment, the drainage hole has an exhaust function, an exhaust channel is added, and the self-priming time of the self-priming pump is shortened; in the normal drainage stage of the self-priming pump, liquid sequentially flows through a water inlet pipe, a liquid storage cavity, a centrifugal impeller, a pressurized water chamber, a gas-liquid separation chamber, a primary auxiliary impeller, a secondary auxiliary impeller, a sealing cavity and a water outlet pipe, wherein high-pressure liquid at the outlet of the pressurized water chamber is used for pressurizing the inlet of the centrifugal impeller through a drainage hole, a drainage cavity and a jet hole, so that the cavitation resistance of the self-priming pump is improved; when the self-priming pump works, high-pressure liquid in the gas-liquid separation chamber enters the double-stage dynamic sealing structure and meets high-pressure fluid generated by rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressures of the two are equal, a liquid ring with a certain thickness is formed; when the thickness change of the liquid ring is carried out in the auxiliary impeller flow channel, the medium cannot leak, so that dynamic sealing is realized, at the moment, the drain hole is a pressure balance hole, when the self-priming pump works under a large-flow working condition, and the pressure in the sealing cavity is far greater than the pressure in the gas-liquid separation chamber, high-pressure liquid in the sealing cavity flows into the gas-liquid separation chamber through the drain hole, so that the damage of high pressure to the sealing structure is reduced; compared with a single-stage dynamic sealing structure, the double-stage dynamic sealing structure formed by connecting the primary auxiliary impeller and the secondary auxiliary impeller in series has smaller radial size, and can greatly reduce the power consumption of the self-priming pump, thereby improving the efficiency of the self-priming pump. In addition, the double-stage dynamic sealing structure can improve the flow state in the gas-liquid separation chamber and reduce the hydraulic loss of the self-priming pump.
The drainage hole drainage reflux amount accounts for 1% -5% of the total flow of the self-priming pump, 3.3% of the drainage reflux amount is used as the optimal drainage hole reflux amount, the number of the drainage holes is larger than or equal to 1, when the number of the drainage holes is 1, the diameter of each drainage hole is 10mm-35mm, and the diameter of each drainage hole is 25mm.
By adopting the structure, the hydraulic performance of the self-priming pump is improved.
The drainage cavity is in a horseshoe shape, the jet holes are uniformly formed in the semicircular inner wall surface of the drainage cavity, and the number of the jet holes is an integral multiple plus 1 of the number of the blades of the centrifugal impeller and is optimal with 2 times plus 1.
The jet flow of the jet hole is consistent with the reflux flow of the drainage hole, and the total area ratio of the drainage hole to the jet hole is 0.1-0.5, preferably 0.25.
By adopting the structure, the hydraulic performance of the self-priming pump is further improved, and the cavitation resistance of the self-priming pump is also improved.
The primary auxiliary impeller and the secondary auxiliary impeller are both composed of blades and a rear cover plate and are open impellers.
Radial gaps are formed among the primary auxiliary impeller, the secondary auxiliary impeller and the sealing plate, and the size of the gaps is 1-5 mm.
The diameter range of the injection hole is 5mm-25mm.
By adopting the structure, the working effect of the self-priming pump can be effectively improved.
The ratio of the double-stage sealing lift of the primary auxiliary impeller and the secondary auxiliary impeller to the lift of the self-priming pump is more than 1 in the full-flow working condition range, and is optimal from 1.4 to 1.8.
By adopting the structure, the damage of high pressure to the sealing structure is reduced.
4-8 drain holes are uniformly arranged on the sealing plate, and the aperture of each drain hole is 5-15 mm.
The primary impeller and the secondary impeller have circumferential phase difference.
By adopting the structure, the exhaust function of the discharge hole is improved, and the self-priming time of the self-priming pump is shortened.
Compared with the prior art, this compromise vertical self priming pump structure of cavitation and hydraulic performance has following advantage:
1. in the starting stage of the self-priming pump, a certain amount of liquid is stored in the liquid storage cavity and the centrifugal impeller, after the pump is started, air sucked into the water inlet pipe is mixed with liquid in the centrifugal impeller under the rotating action of the centrifugal impeller, the mixed liquid is discharged into the gas-liquid separation chamber through the water pressing chamber, after gas-liquid separation, the gas is discharged from the primary auxiliary impeller and the secondary auxiliary impeller through the inlet gap of the sealing cavity and the discharge hole, and the liquid flows back to the centrifugal impeller through the backflow hole to participate in mixing again until self-priming is completed and normal water discharge is realized; at the moment, the drain hole has an exhaust function, an exhaust channel is added, and the self-priming time of the self-priming pump is shortened.
2. In the normal drainage stage of the self-priming pump, liquid flows through the water inlet pipe, the liquid storage cavity, the centrifugal impeller, the pressurized-water chamber, the gas-liquid separation chamber, the primary auxiliary impeller, the secondary auxiliary impeller, the sealing cavity and the water outlet pipe in sequence, wherein high-pressure liquid at the outlet of the pressurized-water chamber is used for pressurizing the inlet of the centrifugal impeller through the drainage hole, the drainage cavity and the jet hole, and the cavitation resistance of the self-priming pump is improved.
3. When the self-priming pump works, high-pressure liquid in the gas-liquid separation chamber enters the double-stage dynamic sealing structure and meets high-pressure fluid generated by rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressures of the two are equal, a liquid ring with a certain thickness is formed; when the thickness change of the liquid ring is carried out in the auxiliary impeller flow channel, the medium cannot be leaked, so that dynamic sealing is realized, at the moment, the drain hole is a pressure balance hole, when the self-priming pump works under the working condition of large flow, the pressure in the sealing cavity is far greater than the pressure in the gas-liquid separation chamber, high-pressure liquid in the sealing cavity flows into the gas-liquid separation chamber through the drain hole, and the damage of high pressure to the sealing structure is reduced.
4. Compared with a single-stage dynamic sealing structure, the double-stage dynamic sealing structure formed by connecting the primary auxiliary impeller and the secondary auxiliary impeller in series has smaller radial size, and can greatly reduce the power consumption of the self-priming pump, thereby improving the efficiency of the self-priming pump. In addition, the double-stage dynamic sealing structure can improve the flow state in the gas-liquid separation chamber and reduce the hydraulic loss of the self-priming pump.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of the bottom surface of the present invention.
In the figure, 1, a water inlet pipe; 2. a liquid storage cavity; 3. a centrifugal impeller; 4. a drainage lumen; 5. an injection hole; 6. a drainage hole; 7. a water pumping chamber; 8. a gas-liquid separation chamber; 9. a water outlet pipe; 10. a first-stage auxiliary impeller; 11. a secondary expeller; 12. a sealing plate; 13. sealing the cavity; 14. a vent hole; 15. a pump shaft; 16. a motor; 17. and (4) a backflow hole.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1-2, the vertical self-priming pump structure considering both cavitation and hydraulic performance comprises a motor 16 and a pump body, the motor 16 is fixedly connected with the pump body, a pump shaft 15 is fixed at an output shaft end of the motor 16, the pump shaft 15 is located inside the pump body, a centrifugal impeller 3, a primary impeller 10 and a secondary impeller 11 are sequentially fixed on the pump shaft 15 from bottom to top, a liquid storage cavity 2, a drainage cavity 4, a pressurized water chamber 7, a gas-liquid separation chamber 8 and a sealing cavity 13 are formed inside the pump body, the centrifugal impeller 3 is located inside the pressurized water chamber 7, the sealing cavity 13 is composed of the primary impeller 10, the secondary impeller 11 and a sealing plate 12, a drainage hole 14 is formed on the sealing plate 12, the primary impeller 10, the secondary impeller 11, the sealing plate 12, a two-stage dynamic sealing structure composed of the pressurized water chamber 13 and the drainage hole 14, the sealing plate 12 and the pump shaft 15 form a sealing cavity inlet gap, a water inlet pipe 1 and a water outlet pipe 9 are fixed on the pump body, the water inlet pipe 1 is communicated with the liquid storage cavity 2, an outlet of the pressurized water chamber 7 is communicated with the liquid storage cavity 8, a side of the pressurized water chamber 7 is communicated with the gas-liquid storage cavity 4 through the drainage hole 6 and a drainage hole 6, the drainage hole 6 is communicated with the drainage hole 6, the drainage hole 6.
In the starting stage of the self-priming pump, a certain amount of liquid is stored in the liquid storage cavity 2 and the centrifugal impeller 3, after the pump is started, air sucked into the water inlet pipe 1 is mixed with liquid in the centrifugal impeller 3 under the rotating action of the centrifugal impeller 3 and is discharged into the gas-liquid separation chamber 8 through the water pressing chamber 7, after gas-liquid separation, the gas is discharged from the first-stage auxiliary impeller 10 and the second-stage auxiliary impeller 11 through the inlet gap and the discharge hole 14 of the sealing cavity 13, and the liquid flows back to the centrifugal impeller 3 through the return hole 17 to be mixed again until self-priming and normal water discharge are completed; at this time, the drain hole 14 has an exhaust function, an exhaust channel is added, and self-priming time of the self-priming pump is shortened; in the normal drainage stage of the self-priming pump, liquid sequentially flows through a water inlet pipe 1, a liquid storage cavity 2, a centrifugal impeller 3, a pressurized water chamber 7, a gas-liquid separation chamber 8, a primary auxiliary impeller 10, a secondary auxiliary impeller 11, a sealing cavity 13 and a water outlet pipe 9, wherein high-pressure liquid at the outlet of the pressurized water chamber 7 pressurizes the inlet of the centrifugal impeller 3 through a drainage hole 6, a drainage cavity 4 and a jet hole 5, so that the cavitation resistance of the self-priming pump is improved; when the self-priming pump works, high-pressure liquid in the gas-liquid separation chamber 8 enters the double-stage dynamic sealing structure and meets high-pressure fluid generated by the rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressures of the two are equal, a liquid ring with a certain thickness is formed; when the thickness change of the liquid ring is carried out in the runner of the auxiliary impeller, the medium cannot leak, so that dynamic sealing is realized, at the moment, the drain hole 14 is a pressure balance hole, when the self-priming pump works under a large-flow working condition, and the pressure in the sealing cavity 13 is far greater than the pressure in the gas-liquid separation chamber 8, high-pressure liquid in the sealing cavity 13 flows into the gas-liquid separation chamber 8 through the drain hole 14, so that the damage of high pressure to a sealing structure is reduced; compared with a single-stage dynamic sealing structure, the double-stage dynamic sealing structure formed by connecting the primary auxiliary impeller 10 and the secondary auxiliary impeller 11 in series has smaller radial size, and can greatly reduce the power consumption of the self-priming pump, thereby improving the efficiency of the self-priming pump. In addition, the double-stage dynamic sealing structure can improve the flow state in the gas-liquid separation chamber and reduce the hydraulic loss of the self-priming pump.
The drainage quantity of the drainage holes 6 accounts for 1% -5% of the total flow of the self-priming pump, 3.3% of the drainage quantity is optimal, the quantity of the drainage holes 6 is more than or equal to 1, when the quantity of the drainage holes 6 is 1, the diameter of the drainage holes 6 is 10mm-35mm, and the diameter is 25mm as the optimal.
The hydraulic performance of the self-priming pump is improved.
The drainage cavity 4 is horseshoe-shaped, the jet holes 5 are uniformly formed in the semicircular inner wall surface of the drainage cavity 4, and the number of the jet holes 5 is an integral multiple plus 1 of the number of the blades of the centrifugal impeller 3 and is optimal with 2 times plus 1.
The injection flow of the injection hole 5 is consistent with the reflux flow introduced by the drainage hole 6, and the total area ratio of the drainage hole 6 to the injection hole 5 is 0.1-0.5, preferably 0.25.
The cavitation resistance of the self-priming pump is improved.
The diameter of the injection hole 4 ranges from 5mm to 25mm.
The primary impeller 10 and the secondary impeller 11 are both composed of blades and a rear cover plate and are open impellers.
Radial gaps exist among the primary auxiliary impeller 10, the secondary auxiliary impeller 11 and the sealing plate 12, and the size of the gaps is 1mm-5mm.
Therefore, the working effect of the self-priming pump can be effectively improved.
The ratio of the double-stage sealing lift of the primary auxiliary impeller 10 and the secondary auxiliary impeller 11 to the self-priming pump lift is more than 1 in the full-flow working condition range, and is optimal from 1.4 to 1.8.
And the damage of high pressure to the sealing structure is reduced.
4-8 drain holes 14 are uniformly arranged on the sealing plate 12, and the aperture of each drain hole 14 is 5-15 mm.
The primary and secondary expeller wheels 10, 11 are circumferentially out of phase.
The exhaust function of the drain hole 14 is improved, and the self-priming time of the self-priming pump is shortened.
The working principle of the self-priming pump is that a certain amount of liquid is stored in the liquid storage cavity 2 and the centrifugal impeller 3 in the starting stage of the self-priming pump, air sucked into the water inlet pipe 1 is mixed with liquid in the centrifugal impeller 3 due to the rotation action of the centrifugal impeller 3 after the pump is started, the mixed liquid is discharged into the gas-liquid separation chamber 8 through the pressure water chamber 7, the gas is discharged from the first-stage auxiliary impeller 10 and the second-stage auxiliary impeller 11 through the inlet gap and the discharge hole 14 of the sealing cavity 13 after the gas-liquid separation, and the liquid flows back to the centrifugal impeller 3 through the backflow hole 17 to participate in the mixing again until the self-priming is completed and the normal water is discharged; at this time, the drain hole 14 has an exhaust function, an exhaust channel is added, and self-priming time of the self-priming pump is shortened; in the normal drainage stage of the self-priming pump, liquid sequentially flows through a water inlet pipe 1, a liquid storage cavity 2, a centrifugal impeller 3, a pressurized water chamber 7, a gas-liquid separation chamber 8, a primary auxiliary impeller 10, a secondary auxiliary impeller 11, a sealing cavity 13 and a water outlet pipe 9, wherein high-pressure liquid at the outlet of the pressurized water chamber 7 pressurizes the inlet of the centrifugal impeller 3 through a drainage hole 6, a drainage cavity 4 and a jet hole 5, so that the cavitation resistance of the self-priming pump is improved; when the self-priming pump works, high-pressure liquid in the gas-liquid separation chamber 8 enters the double-stage dynamic sealing structure and meets high-pressure fluid generated by the rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressures of the two are equal, a liquid ring with a certain thickness is formed; when the thickness change of the liquid ring is carried out in the auxiliary impeller flow channel, the medium cannot leak, so that dynamic sealing is realized, at the moment, the drainage hole 14 is a pressure balance hole, when the self-priming pump works under the working condition of large flow, the pressure in the sealing cavity 13 is far greater than the pressure in the gas-liquid separation chamber 8, high-pressure liquid in the sealing cavity 13 flows into the gas-liquid separation chamber 8 through the drainage hole 14, and the damage of high pressure to the sealing structure is reduced.
In conclusion, the functions of improving the hydraulic performance and the cavitation resistance of the self-priming pump are realized through the matching of the centrifugal impeller 3, the water inlet pipe 1, the liquid storage cavity 2 and other components.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments, or alternatives may be employed, by those skilled in the art, without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (10)
1. A vertical self-priming pump structure with cavitation and hydraulic performance, which comprises a motor (16) and a pump body, and is characterized in that the motor (16) is fixedly connected with the pump body, a pump shaft (15) is fixed at the output shaft end of the motor (16), the pump shaft (15) is positioned in the pump body, a centrifugal impeller (3), a primary secondary impeller (10) and a secondary impeller (11) are sequentially fixed on the pump shaft (15) from bottom to top, a liquid storage cavity (2) is formed in the pump body, a drainage cavity (4), a pressurized-water chamber (7), a gas-liquid separation chamber (8) and a sealing cavity (13), the centrifugal impeller (3) is positioned in the pressurized-water chamber (7), the sealing cavity (13) consists of the primary secondary impeller (10), the secondary impeller (11) and a sealing plate (12), a drainage hole (14) is formed in the sealing plate (12), the primary secondary impeller (10), the secondary impeller (11), the sealing plate (12), the sealing cavity (13) and the drainage hole (14) form double-stage dynamic motion, a sealing cavity gap is formed between the pressurized-water chamber (12) and the pump shaft (15), a water inlet pipe (1) and a water inlet pipe (9) are fixed on the sealing plate (7), a water inlet pipe (17) and a water outlet (7) are formed in the side of the liquid storage cavity (7) and a water inlet pipe (17), the export and outlet pipe (9) the intercommunication of gas-liquid separation room (8), drainage chamber (4) are through jet orifice (5) and stock solution chamber (2) intercommunication, and drainage chamber (4) are through drainage hole (6) and gas-liquid separation room (8) intercommunication, and drainage hole (6), drainage chamber (4) and jet orifice (5) constitute drainage injection structure jointly, and the export of drainage hole (6) is located between pressurized-water chamber (7) and outlet pipe (9).
2. The vertical self-priming pump structure integrating cavitation and hydraulic performance according to claim 1 is characterized in that the backflow amount of the drainage holes (6) accounts for 1% -5% of the total flow of the self-priming pump, the number of the drainage holes (6) is greater than or equal to 1, and when the number of the drainage holes (6) is 1, the diameter of the drainage holes (6) is 10mm-35mm.
3. The vertical self-priming pump structure integrating cavitation and hydraulic performance as claimed in claim 1, wherein the drainage cavity (4) is horseshoe-shaped, the injection holes (5) are uniformly formed in the inner wall surface of the semicircle of the drainage cavity (4), and the number of the injection holes (5) is an integral multiple +1 of the number of the blades of the centrifugal impeller (3).
4. The vertical self-priming pump structure integrating cavitation and hydraulic performance as claimed in claim 1, wherein the jet flow of the jet holes (5) is consistent with the backflow guide flow of the drainage holes (6), and the total area ratio of the drainage holes (6) to the jet holes (5) ranges from 0.1 to 0.5.
5. The vertical self-priming pump structure combining cavitation and hydraulic performance according to claim 1, characterized in that the diameter of the injection hole (4) ranges from 5mm to 25mm.
6. The vertical self-priming pump structure combining cavitation and hydraulic performance according to claim 1, characterized in that the primary and secondary impellers (10, 11) are both composed of blades and a back cover plate and are open impellers.
7. The vertical self-priming pump structure integrating cavitation and hydraulic performances according to claim 1, wherein radial gaps exist among the primary secondary impeller (10), the secondary impeller (11) and the sealing plate (12), and the size of the gaps is 1mm-5mm.
8. The vertical self-priming pump structure combining cavitation and hydraulic performance according to claim 1, characterized in that the ratio of the double-stage sealing lift of the primary (10) and secondary (11) auxiliary impellers to the self-priming pump lift is greater than 1 in the full flow operating condition range.
9. The vertical self-priming pump structure combining cavitation and hydraulic performance as claimed in claim 1, characterized in that 4-8 drain holes (14) are uniformly arranged on the sealing plate (12), and the diameter of the drain holes (14) is 5mm-15mm.
10. The vertical self-priming pump structure combining cavitation and hydraulic performance according to claim 1, characterized in that the primary (10) and secondary (11) impellers are circumferentially out of phase.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211221693.8A CN115573919B (en) | 2022-10-08 | 2022-10-08 | Vertical self-priming pump structure with cavitation and hydraulic performance |
| PCT/CN2022/138562 WO2024073943A1 (en) | 2022-10-08 | 2022-12-13 | Vertical self-priming pump structure having both cavitation and hydraulic properties |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211221693.8A CN115573919B (en) | 2022-10-08 | 2022-10-08 | Vertical self-priming pump structure with cavitation and hydraulic performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115573919A true CN115573919A (en) | 2023-01-06 |
| CN115573919B CN115573919B (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211221693.8A Active CN115573919B (en) | 2022-10-08 | 2022-10-08 | Vertical self-priming pump structure with cavitation and hydraulic performance |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115573919B (en) |
| WO (1) | WO2024073943A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116221131A (en) * | 2023-04-10 | 2023-06-06 | 台州科技职业学院 | Adjusting device for improving cavitation resistance of water pump and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116221131A (en) * | 2023-04-10 | 2023-06-06 | 台州科技职业学院 | Adjusting device for improving cavitation resistance of water pump and control method |
| CN116221131B (en) * | 2023-04-10 | 2024-03-05 | 台州科技职业学院 | Adjusting device for improving cavitation resistance of water pump and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024073943A1 (en) | 2024-04-11 |
| CN115573919B (en) | 2024-03-15 |
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