CN115573919B - 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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- CN115573919B CN115573919B CN202211221693.8A CN202211221693A CN115573919B CN 115573919 B CN115573919 B CN 115573919B CN 202211221693 A CN202211221693 A CN 202211221693A CN 115573919 B CN115573919 B CN 115573919B
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- priming pump
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- 239000007788 liquid Substances 0.000 claims abstract description 92
- 238000000926 separation method Methods 0.000 claims abstract description 37
- 238000003860 storage Methods 0.000 claims abstract description 16
- 230000037452 priming Effects 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000002347 injection Methods 0.000 claims description 22
- 239000007924 injection Substances 0.000 claims description 22
- 238000010992 reflux Methods 0.000 claims description 7
- 230000008676 import Effects 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract description 10
- 238000003825 pressing Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 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
- 230000006872 improvement 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
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
-
- 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. The utility model provides a compromise vertical self priming pump structure of cavitation and hydraulic property, including motor and pump body, motor and pump body fixed connection, the output axle head of motor is fixed with the pump shaft, the pump shaft is located inside the pump body, from down upwards being fixed with centrifugal impeller in proper order on the pump shaft, first-stage auxiliary impeller and secondary auxiliary impeller, liquid storage cavity has been seted up to inside the pump body, the drainage cavity, the pumping chamber, gas-liquid separation room and seal chamber, centrifugal impeller is located inside the pumping chamber, seal chamber comprises first-stage auxiliary impeller, secondary auxiliary impeller and closing plate, the bleeder hole has been seted up on the closing plate, first-stage auxiliary impeller, secondary auxiliary impeller, the closing plate, seal chamber and bleeder hole constitute doublestage dynamic seal structure. The invention has the advantages of improving the hydraulic performance and cavitation resistance of the self-priming pump.
Description
Technical Field
The invention belongs to the technical field of mechanical pumps, and relates to a self-priming pump, in particular to a vertical self-priming pump structure with cavitation and hydraulic performance.
Background
The self-priming pump is a centrifugal pump with self-priming performance, and only needs to pump when the pump is started for the first time, pumps water up by the self action of the pump through short time operation, and the self-priming pump is started again without pumping, so that the self-priming pump has the characteristics of primary drainage and self-priming for life. For the occasion of frequent starting and difficult filling, the self-priming pump has higher applicability. Compared with the common centrifugal pump, the self-priming pump has the advantages of simple structure, low manufacturing cost, convenient disassembly, reliable sealing performance, good self-priming performance and convenient remote centralized control, and is widely applied to the fields of agriculture, fire protection, petrochemical industry, steel smelting, water-saving irrigation, drainage, sewage treatment and the like.
The traditional self-priming pump generally adopts the dynamic seal of the auxiliary impeller, and the liquid is blocked under the action of the centrifugal force of the rotation of the auxiliary impeller, so that no leakage is realized. The auxiliary impeller works on the rotation of the liquid, so that the power consumption of the shaft is high, and the efficiency of the self-priming pump is reduced. In addition, in the running process of the self-priming pump, cavitation is unavoidable, when the self-priming pump is subjected to serious cavitation, not only the hydraulic performance of the pump is reduced, but also vibration and noise are generated, and the running stability of the pump is seriously affected. Aiming at the defects of the traditional self-priming pump, the structural optimization of the self-priming pump becomes one of the trends of self-priming pump research and development.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a vertical self-priming pump structure with cavitation and hydraulic performance, which aims to solve the technical problems that: how to realize the improvement of the hydraulic performance and the cavitation resistance of the self-priming pump.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a compromise vertical self priming pump structure of cavitation and hydraulic property, including motor and pump body, motor and pump body fixed connection, the output axle head of motor is fixed with the pump shaft, the pump shaft is located inside the pump body, the pump shaft is last to be fixed with centrifugal impeller from down up in proper order, first-stage auxiliary impeller and secondary auxiliary impeller, the liquid storage chamber has been seted up to the pump body inside, the drainage chamber, pressurized-water chamber, gas-liquid separation room and sealed chamber, centrifugal impeller is located pressurized-water chamber inside, sealed chamber comprises first-stage auxiliary impeller, secondary auxiliary impeller and closing plate, the bleeder hole has been seted up on the closing plate, first-stage auxiliary impeller, second-stage auxiliary impeller, the closing plate, sealed chamber and bleeder hole constitute doublestage dynamic seal structure, sealed chamber import clearance is formed with the pump shaft to the closing plate, be fixed with inlet tube and outlet pipe on the pump body, inlet tube and liquid storage chamber intercommunication, pressurized-water chamber's export and gas-liquid separation room intercommunication, pressurized-liquid separation chamber's export and outlet pipe intercommunication, the drainage chamber communicates with the gas-liquid separation room through the bleeder hole, drainage hole and the joint constitution drainage hole, drainage hole and drainage hole are located between pressurized-water chamber and the outlet pipe.
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 due to the rotation effect of the centrifugal impeller, the mixture is discharged to the gas-liquid separation chamber through the water pressing chamber, after the gas-liquid separation, the gas is discharged from the primary auxiliary impeller and the secondary auxiliary impeller through the inlet gap and the drainage hole of the sealing cavity, and the liquid flows back to the centrifugal impeller through the backflow hole to be mixed again until self-priming is completed, and normal drainage is realized; at the moment, the drainage hole has an exhaust function, an exhaust channel is increased, 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, a liquid storage cavity, a centrifugal impeller, a water pressing chamber, a gas-liquid separation chamber, a first-stage auxiliary impeller, a secondary auxiliary impeller, a sealing cavity and a water outlet pipe, wherein high-pressure liquid at the outlet of the water pressing chamber pressurizes the inlet of the centrifugal impeller through a drainage hole, the drainage cavity and an injection hole, and 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 the high-pressure fluid generated by the rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressure of the two fluid flows is 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 runner, 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 high-flow working condition, 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; 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 dimension, 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-sucking pump.
The drainage hole reflux amount accounts for 1% -5% of the total flow of the self-priming pump, 3.3% of the reflux amount is optimal, the number of the drainage holes is more than or equal to 1, and when the number of the drainage holes is 1, the diameter of the drainage holes is 10mm-35mm, and the diameter is 25mm.
By adopting the structure, the hydraulic performance of the self-priming pump is improved.
The drainage cavity is horseshoe-shaped, the injection holes are uniformly formed in the semicircular inner wall surface of the drainage cavity, and the number of the injection holes is an integer multiple of the number of blades of the centrifugal impeller and is +1, and the number of the injection holes is 2 times +1, so that the centrifugal impeller is optimal.
The jet flow of the jet hole is consistent with the drainage hole reflux quantity, and the total area ratio of the drainage hole to the jet hole is in the range of 0.1-0.5, and is optimally 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 1mm-5mm.
The diameter range of the jet hole is 5mm-25mm.
By adopting the structure, the working effect of the self-priming pump can be effectively improved.
The ratio of the two-stage sealing lift of the primary auxiliary impeller to the two-stage sealing lift of the secondary auxiliary impeller to the lift of the self-priming pump is greater than 1 in the full-flow working condition range and is optimally 1.4-1.8.
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 first-stage auxiliary impeller and the secondary auxiliary impeller have a circumferential phase difference.
By adopting the structure, the exhaust function of the drainage hole is improved, and the self-priming time of the self-priming pump is shortened.
Compared with the prior art, the vertical self-priming pump structure taking cavitation and hydraulic performance into consideration has the following advantages:
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 due to the rotation effect of the centrifugal impeller, the mixture is discharged to the gas-liquid separation chamber through the water pressing chamber, after the gas-liquid separation, the gas is discharged from the primary auxiliary impeller and the secondary auxiliary impeller through the inlet gap and the drainage hole of the sealing cavity, and the liquid flows back to the centrifugal impeller through the backflow hole to be mixed again until self-priming is completed, and normal drainage is realized; at this time, the drain hole has the exhaust function, has increased the exhaust passage, shortens self priming time of self priming pump.
2. 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 water pumping chamber, a gas-liquid separation chamber, a first-stage auxiliary impeller, a secondary auxiliary impeller, a sealing cavity and a water outlet pipe, wherein high-pressure liquid at the outlet of the water pumping chamber pressurizes the inlet of the centrifugal impeller through a drainage hole, the drainage cavity and an injection 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 the high-pressure fluid generated by the rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressure of the two fluid flows is 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 runner, the medium can not 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 high-flow working condition, 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 dimension, 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-sucking pump.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the structure 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 cavity; 5. an injection hole; 6. drainage holes; 7. a pumping chamber; 8. a gas-liquid separation chamber; 9. a water outlet pipe; 10. a first-stage auxiliary impeller; 11. a secondary impeller; 12. a sealing plate; 13. sealing the cavity; 14. a drain hole; 15. a pump shaft; 16. a motor; 17. and a reflow hole.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in figures 1-2, the vertical self-priming pump structure taking cavitation and hydraulic performance into consideration comprises a motor 16 and a pump body, wherein the motor 16 is fixedly connected with the pump body, a pump shaft 15 is fixedly arranged at the output shaft end of the motor 16, the pump shaft 15 is positioned in the pump body, a centrifugal impeller 3, a first-stage auxiliary impeller 10 and a second-stage auxiliary impeller 11 are sequentially and upwards fixed on the pump shaft 15 from bottom to top, a liquid storage chamber 2, a drainage chamber 4, a pumping chamber 7, a gas-liquid separation chamber 8 and a sealing chamber 13 are formed in the pump body, the centrifugal impeller 3 is positioned in the pumping chamber 7, the sealing chamber 13 consists of the first-stage auxiliary impeller 10, the second-stage auxiliary impeller 11 and a sealing plate 12, a drainage hole 14 is formed in the sealing plate 12, the first-stage auxiliary impeller 10, the second-stage auxiliary impeller 11, the sealing plate 12, the sealing chamber 13 and the drainage hole 14, a sealing plate 12 and the pump shaft 15 form a sealing chamber inlet gap, a water inlet pipe 1 and a water outlet pipe 9 are fixedly arranged on the pump body, the water inlet pipe 1 is communicated with the cavity 2, an outlet of the pumping chamber 7 is communicated with the gas-liquid separation chamber 8, a backflow hole 17 is formed in the side of the pumping chamber 7, an outlet of the liquid separation chamber 8 is communicated with the drainage chamber 9, the outlet of the liquid storage chamber 4 is communicated with the drainage chamber 6 and the drainage chamber 6 through the drainage chamber 6 and the drainage chamber 6, the drainage hole 6 is communicated with the drainage hole 6, the drainage hole 6 and the drainage hole 6, and the drainage hole 6 is communicated with 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 due to the rotation effect of the centrifugal impeller 3, the mixture is discharged to the gas-liquid separation chamber 8 through the water pressing chamber 7, after the gas-liquid separation, the gas is discharged from the primary auxiliary impeller 10 and the secondary auxiliary impeller 11 through the inlet gap and the drainage hole 14 of the sealing cavity 13, and the liquid flows back to the centrifugal impeller 3 through the backflow hole 17 to participate in mixing again until self-priming is completed, and normal drainage is realized; at this time, the drain hole 14 has an exhaust function, an exhaust channel is increased, 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 water pressing 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 water pressing chamber 7 pressurizes the inlet of the centrifugal impeller 3 through a drainage hole 6, a drainage cavity 4 and an injection 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 rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressure of the two fluid flows is equal, a liquid ring with a certain thickness is formed; when the thickness change of the liquid ring is carried out in the flow passage 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 high-flow working condition, the pressure in the sealing cavity 13 is far greater than the pressure in the gas-liquid separation chamber 8, and 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 dimension, 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-sucking pump.
The reflux quantity of the drainage holes 6 accounts for 1% -5% of the total flow of the self-priming pump, 3.3% of the reflux quantity is optimal, the quantity of the drainage holes 6 is more than or equal to 1, and 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.
The hydraulic performance of the self-priming pump is improved.
The drainage cavity 4 is horseshoe-shaped, the injection holes 5 are uniformly formed in the semicircular inner wall surface of the drainage cavity 4, and the number of the injection holes 5 is an integer multiple of the number of blades of the centrifugal impeller 3 and is +1, and the number of the injection holes is 2 times +1, so that the centrifugal impeller is optimal.
The injection flow of the injection hole 5 is consistent with the reflux flow of the drainage hole 6, and the total area ratio of the drainage hole 6 to the injection hole 5 is in the range of 0.1-0.5, and is optimally 0.25.
And the cavitation resistance of the self-priming pump is improved.
The diameter of the jet hole 5 is in the range of 5mm-25mm.
The primary side impeller 10 and the secondary side impeller 11 are both composed of blades and a rear cover plate, and are open impellers.
Radial gaps are formed 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 two-stage sealing lift of the primary auxiliary impeller 10 and the secondary auxiliary impeller 11 to the self-priming pump lift is greater than 1 in the full-flow working condition range and is optimally 1.4-1.8.
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 the drain holes 14 is 5-15 mm.
There is a circumferential phase difference between the primary and secondary counter-impellers 10, 11.
The exhaust function of the drain hole 14 is improved, and the self-priming time of the self-priming pump is shortened.
In the starting stage of the self-priming pump, a certain amount of liquid is stored in a liquid storage cavity 2 and a centrifugal impeller 3, after the pump is started, air sucked into a water inlet pipe 1 is mixed with liquid in the centrifugal impeller 3 due to the rotation effect of the centrifugal impeller 3, the mixture is discharged to a gas-liquid separation chamber 8 through a water pressing chamber 7, after the gas is separated from the liquid, the gas is discharged from a primary auxiliary impeller 10 and a secondary auxiliary impeller 11 through an inlet gap and a drainage hole 14 of a sealing cavity 13, and the liquid flows back to the centrifugal impeller 3 through a backflow hole 17 to participate in mixing again until self-priming and normal drainage are completed; at this time, the drain hole 14 has an exhaust function, an exhaust channel is increased, 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 water pressing 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 water pressing chamber 7 pressurizes the inlet of the centrifugal impeller 3 through a drainage hole 6, a drainage cavity 4 and an injection 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 rotation of the double-stage dynamic sealing auxiliary impeller, and when the pressure of the two fluid flows is equal, a liquid ring with a certain thickness is formed; when the thickness change of the liquid ring is carried out in the flow passage 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 high-flow working condition, the pressure in the sealing cavity 13 is far greater than the pressure in the gas-liquid separation chamber 8, and 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.
In sum, through the cooperation of the components such as centrifugal impeller 3, inlet tube 1 and stock solution chamber 2, realized improving the function of self priming pump's hydraulic property and anti cavitation performance.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
1. The utility model provides a compromise vertical self priming pump structure of cavitation and hydraulic property, including motor (16) and the pump body, a serial communication port, motor (16) and pump body fixed connection, the output axle head of motor (16) is fixed with pump shaft (15), pump shaft (15) are located the pump body inside, centrifugal impeller (3) are fixed with in proper order from down on pump shaft (15), first-stage auxiliary impeller (10) and secondary auxiliary impeller (11), liquid storage chamber (2) are seted up to the pump body inside, drainage chamber (4), pressurized water chamber (7), gas-liquid separation chamber (8) and sealed chamber (13), centrifugal impeller (3) are located pressurized water chamber (7) inside, sealed chamber (13) are by first-stage auxiliary impeller (10), secondary auxiliary impeller (11) and closing plate (12), drain hole (14) are seted up on closing plate (12), first-stage auxiliary impeller (10), secondary auxiliary impeller (11), closing plate (12), sealed chamber (13) and drain hole (14) constitute doublestage dynamic seal structure, sealing plate (12) and pump shaft (15) form sealed chamber import clearance, upper fixed with inlet tube (1) and pump body (7) and pressurized water chamber (7) are connected with outlet (8) and water inlet tube (8), the drainage chamber (4) is communicated with the liquid storage chamber (2) through the injection hole (5), the drainage chamber (4) is communicated with the gas-liquid separation chamber (8) through the drainage hole (6), the drainage chamber (4) and the injection hole (5) jointly form a drainage injection structure, and the outlet of the drainage hole (6) is located between the drainage chamber (7) and the water outlet pipe (9).
2. The vertical self-priming pump structure taking both cavitation and hydraulic performance into consideration according to claim 1, wherein the drainage flow 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 not less than 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 taking both cavitation and hydraulic performance into consideration according to claim 1, wherein the drainage cavity (4) is horseshoe-shaped, the injection holes (5) are uniformly formed on the semicircular inner wall surface of the drainage cavity (4), and the number of the injection holes (5) is an integer multiple +1 of the number of blades of the centrifugal impeller (3).
4. The vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, wherein the injection flow of the injection hole (5) is consistent with the guiding reflux flow of the guiding hole (6), and the total area ratio of the guiding hole (6) to the injection hole (5) is in the range of 0.1-0.5.
5. The vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, wherein the diameter of the jet hole (5) is in the range of 5mm-25mm.
6. The vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, wherein the primary side impeller (10) and the secondary side impeller (11) are both composed of blades and a rear cover plate and are open impellers.
7. The vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, wherein radial gaps are formed 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.
8. The vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, wherein the ratio of the two-stage sealing lift of the primary auxiliary impeller (10) and the secondary auxiliary impeller (11) to the self-priming pump lift is greater than 1 in the full-flow working condition range.
9. The vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, wherein 4-8 drain holes (14) are uniformly arranged on the sealing plate (12), and the aperture of the drain hole (14) is 5-15 mm.
10. A vertical self-priming pump structure with cavitation and hydraulic performance according to claim 1, characterized in that the primary side impeller (10) and the secondary side impeller (11) have a circumferential phase difference.
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 |
|---|---|
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| CN202211221693.8A Active CN115573919B (en) | 2022-10-08 | 2022-10-08 | Vertical self-priming pump structure with cavitation and hydraulic performance |
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| WO (1) | WO2024073943A1 (en) |
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| 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 |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2024073943A1 (en) | 2024-04-11 |
| CN115573919A (en) | 2023-01-06 |
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