CN114260492A - Closed impeller cutting method of self-priming pump - Google Patents
Closed impeller cutting method of self-priming pump Download PDFInfo
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- CN114260492A CN114260492A CN202111572577.6A CN202111572577A CN114260492A CN 114260492 A CN114260492 A CN 114260492A CN 202111572577 A CN202111572577 A CN 202111572577A CN 114260492 A CN114260492 A CN 114260492A
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- 238000005520 cutting process Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000003801 milling Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000003631 expected effect Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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Abstract
The invention discloses a closed impeller cutting method of a self-priming pump, which comprises the following steps: the invention explains and describes a self-priming pump closed impeller cutting method with 3 to 8 blades respectively, which can conveniently cut part of the blades of the impeller by a milling method, and the outer diameters of the other part of the blades and an impeller cover plate are kept unchanged, thereby reducing the lift of the pump by 2 to 20m, simultaneously keeping the self-priming performance of the pump unchanged, which can not be realized by the traditional impeller outer diameter cutting method. The innovative method has the advantages of low cost, short manufacturing period, strong operability and strong practicability, and achieves the effect of reducing the pump lift by cutting the outer diameter of the impeller in the prior art.
Description
Technical Field
The invention relates to the technical field of self-priming pump impeller machining, in particular to a closed impeller cutting method of a self-priming pump.
Background
The self-priming pump has more factors influencing the self-priming performance, wherein the clearance between the partition tongue in the volute of the pump body and the outer diameter of the impeller is an important factor, the smaller the clearance is, the more the gas-liquid mixture in the pump body is discharged, and the shorter the self-priming time is. Typically the gap is controlled to be between 0.5 and 1 mm. However, the pump product does not standardize the power of the motor like the motor product, so the power grade number of the motor is fixed. The performance parameters of pump products vary widely, so that the performance required by customers is the same, and even a series of products cannot meet the requirements sometimes. In the model selection, it often appears that the head of a prototype pump is 2 to 20m higher than the head required by the customer. For a common closed impeller centrifugal pump, the lift can be reduced by cutting the outer diameter of the closed impeller; after the self-priming pump cuts the outer diameter of the closed impeller, the gap between the partition tongue in the pump body volute and the outer diameter of the closed impeller is enlarged, so that the self-priming performance of the pump is influenced, the self-priming time is prolonged, and some of the self-priming pumps even cannot self-prime. And a new impeller is redesigned by adopting pump body parameters, and the mold is remolded for production, so that the cost is high, and the production period is long.
Disclosure of Invention
The invention aims to provide a closed impeller cutting method of a self-priming pump, which achieves the effects of reducing the pump lift and not influencing the self-priming performance of the pump.
The purpose of the invention can be realized by the following technical scheme:
a closed impeller cutting method of a self-priming pump comprises the following steps: keeping the original outer diameter D of the closed impeller unchanged, carrying out staggered cutting on half blades of the closed impeller, wherein the cutting amount of the cutting blades is L, and the numerical values of the cutting amounts L of the impellers with different blade numbers are different.
As a further scheme of the invention: for the self-priming pump closed impeller with 4, 6 and 8 blades, the original outer diameter D of the closed impeller is kept unchanged, and the fourth, sixth and eighth blades of the impeller are cut.
As a further scheme of the invention: and cutting the fourth, sixth and eighth blades of the impeller, wherein the cutting amount L is 2 times of the cutting amount required when all the blades are cut.
As a further scheme of the invention: for a self-priming pump closed impeller with 3 blades, the original outer diameter D of the closed impeller is kept unchanged, and the first blade and the third blade in the closed impeller are cut.
As a further scheme of the invention: the cutting position of first piece of blade is close to front shroud one side at the blade, and the degree of depth is L, and the width is half of impeller exit width, and the cutting position of third piece of blade is close to back shroud one side at the blade, and the degree of depth is L, and the width is half of impeller exit width.
As a further scheme of the invention: the blade number is 3 self priming pump closed impeller, and its blade cutting volume L is 3 times of required cutting volume when all blades are cut completely.
As a further scheme of the invention: for a self-priming pump closed impeller with 5 blades, keeping the original outer diameter D of the closed impeller unchanged, and then cutting a first blade in the closed impeller, namely milling the blade at one side close to a front cover plate, wherein the depth is L, and the width is half of the width of an outlet of the impeller; then the second blade is not cut; next, cutting the third blade, namely milling the whole blade to a depth of L; then the fourth blade is not cut; and then cutting the fifth blade, and milling the blade at the side close to the rear cover plate, wherein the depth is L, and the width is half of the width of the outlet of the impeller.
As a further scheme of the invention: the blade number is 5 self priming pump enclosed impeller, and its blade cutting volume L is required cutting volume 2.5 times when all blades are all cut.
As a further scheme of the invention: for a self-priming pump closed impeller with 7 blades, keeping the original outer diameter D of the closed impeller unchanged, and then cutting a first blade in the closed impeller, namely milling the blade at one side close to a front cover plate, wherein the depth is L, and the width is half of the width of an outlet of the impeller; then the second blade is not cut; next, cutting the third blade, namely milling the whole blade to a depth of L; then the fourth blade is not cut; next, cutting the fifth blade, namely milling the whole blade to a depth of L; cutting the sixth blade; and then cutting the seventh blade, and milling the blade at the side close to the rear cover plate, wherein the depth is L, and the width is half of the width of the outlet of the impeller.
As a further scheme of the invention: the blade cutting amount L of the closed impeller of the self-priming pump with 7 blades is 2.34 times of the cutting amount needed when all the blades are completely cut.
The invention has the beneficial effects that:
(1) no need of re-molding: by adopting a conventional method, impeller design is carried out according to performance parameters, then a mould is manufactured again, the mould manufacturing can be completed within more than half a month generally, and the mould manufacturing period is long. And by adopting the new method, an impeller mould does not need to be manufactured, and an old mould is adopted.
(2) The speed is fast, and the cost is low: the conventional method needs to manufacture a set of die, so that the manufacturing period is long, and the cost and expense are high. And the new impeller cutting method is adopted, the production period is short, and the production cost and the expense are correspondingly reduced. Therefore, the product supply period is shortened, the product cost is reduced, and the market competitiveness is correspondingly improved.
(3) The reliability is high: the innovative method is carried out on the basis of the original impeller, and simultaneously, the outer diameter size of the closed impeller is kept unchanged, so that the gap between the cut outer circle of the closed impeller and the pump body baffle tongue is kept unchanged, and the gap is controlled to be 0.5-1 mm. Therefore, the self-priming performance of the self-priming pump can be effectively ensured, the purpose of reducing the lift of the self-priming pump is achieved, and the expected effect is realized.
(4) The practicability is strong: the innovative method explains and describes the cutting method of the self-priming pump closed impeller with 3 to 8 blades respectively, and can conveniently cut partial blades of the impeller by a milling method, while the outer diameters of the other part of blades and the impeller cover plate are kept unchanged, thereby reducing the pump lift by 2 to 20m, and simultaneously keeping the self-priming performance of the pump unchanged, which cannot be realized by the traditional method for cutting the outer diameter of the impeller. The innovative method has the advantages of low cost, short manufacturing period, strong operability and strong practicability, achieves the effect of reducing the pump lift by cutting the outer diameter of the impeller in the prior art, and can keep the self-sucking performance of the self-sucking pump unchanged.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the blade of the present invention before cutting;
FIG. 2 is a schematic view of the construction of the present invention for the cutting of even-numbered blades;
FIG. 3 is a schematic view of a three-blade cutting configuration of the present invention;
FIG. 4 is a schematic view of a five-blade cutting configuration of the present invention;
FIG. 5 is a schematic view of a seven-blade cutting configuration of the present invention;
FIG. 6 is a schematic view of the attachment of the impeller of the present invention to a self-primer pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention is a closed impeller cutting method for a self-priming pump, which includes: keeping the original outer diameter D of the closed impeller unchanged, carrying out staggered cutting on half blades of the closed impeller, wherein the cutting amount of the cutting blades is L, and the numerical values of the cutting amounts L of the impellers with different blade numbers are different.
Referring to fig. 2, for a self-priming pump closed impeller with 4, 6, and 8 blades, the original outer diameter D of the closed impeller is maintained, then half of the blades of the closed impeller are cut in a staggered manner, i.e., the 1 st blade in the closed impeller is not cut, the 2 nd blade is cut, the 3 rd blade is not cut, the 4 th blade is cut again, and circular cutting is performed according to the rule, where the cutting amount L is about 2 times of the cutting amount required by cutting all the original blades. Different blade lengths L can be milled according to the numerical value of the reduction of the pump lift. Meanwhile, the diameters D of the front cover plate and the rear cover plate of the closed impeller are kept unchanged in the milling process.
Referring to fig. 3, for a self-priming pump closed impeller with 3 blades, the original outer diameter D of the closed impeller is kept unchanged, and then the 1 st blade in the closed impeller is cut, that is, the blade is milled at a side close to a front cover plate, the depth is L, and the width is half of the width of an outlet of the impeller; then the 2 nd blade is not cut; and then, cutting the 3 rd blade, namely milling the blade at the side close to the rear cover plate, wherein the depth is L, the width is half of the width of the outlet of the impeller, and the cutting amount L is about 3 times of the cutting amount required by all the original blades. Different blade lengths L can be milled according to the numerical value of the reduction of the lift. Meanwhile, the diameters D of the front cover plate and the rear cover plate of the closed impeller are kept unchanged in the milling process.
Referring to fig. 4, for a self-priming pump closed impeller with 5 blades, the original outer diameter D of the closed impeller is kept unchanged, and then the 1 st blade in the closed impeller is cut, that is, the blade is milled at a side close to a front cover plate, the depth is L, and the width is half of the width of an outlet of the impeller; then the 2 nd blade is not cut; next, cutting the 3 rd blade, namely milling the whole blade to a depth of L; then the 4 th blade is not cut; and then cutting the 5 th blade, milling the blade at the side close to the rear cover plate, wherein the depth is L, the width is half of the width of the outlet of the impeller, and the cutting amount L is about 2.5 times of the cutting amount required by all the original blades. Different blade lengths L can be milled according to the numerical value of the reduction of the lift. Meanwhile, the diameters D of the front cover plate and the rear cover plate of the closed impeller are kept unchanged in the milling process.
Referring to fig. 5, for a self-priming pump closed impeller with 7 blades, the original outer diameter D of the closed impeller is kept unchanged, and then the 1 st blade in the closed impeller is cut, that is, the blade is milled at a side close to a front cover plate, the depth is L, and the width is half of the width of an outlet of the impeller; then the 2 nd blade is not cut; next, cutting the 3 rd blade, namely milling the whole blade to a depth of L; then the 4 th blade is not cut; next, cutting the 5 th blade, namely milling the whole blade to a depth of L; then the 6 th blade is not cut; and then cutting the 7 th blade, milling the blade at the side close to the back cover plate, wherein the depth is L, the width is half of the width of the outlet of the impeller, and the cutting amount L is about 2.34 times of the cutting amount required by all the original blades. Different blade lengths L can be milled according to the numerical value of the reduction of the lift. Meanwhile, the diameters D of the front cover plate and the rear cover plate of the closed impeller are kept unchanged in the milling process.
Referring to fig. 6, the cut shrouded impeller was re-tested for dynamic balance.
And then the closed impeller is reassembled on the self-priming pump, and the clearance between the excircle of the closed impeller and the pump body baffle tongue cut by the method is kept unchanged, and the clearance is generally controlled to be between 0.5 and 1 mm. This is an important factor affecting the self-priming performance of self-priming pumps.
After the self-sucking pump is qualified in a hydrostatic test, the performance test can be carried out, the pump lift is reduced according to the test result, the required lift value is obtained, the self-sucking time is consistent with that of the round closed impeller before cutting, and the expected effect is achieved.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A closed impeller cutting method of a self-priming pump is characterized by comprising the following steps: keeping the original outer diameter D of the closed impeller unchanged, carrying out staggered cutting on half blades of the closed impeller, wherein the cutting amount of the cutting blades is L, and the numerical values of the cutting amounts L of the impellers with different blade numbers are different.
2. The method of claim 1, wherein for a self-priming pump shrouded impeller with 4, 6 and 8 vanes, the fourth, sixth and eighth vanes of the impeller are cut while maintaining the original outer diameter D of the shrouded impeller.
3. The method of claim 2, wherein the fourth, sixth and eighth blades of the impeller are cut in an amount L2 times the amount of all blades required to cut the impeller.
4. The method according to claim 1, wherein for a self-priming pump shrouded impeller with 3 blades, the first and third blades of the shrouded impeller are cut while maintaining the original outer diameter D of the shrouded impeller.
5. The method of claim 4, wherein the first blade is cut at a position on the side of the blade near the front cover plate with a depth of L that is half the width of the impeller outlet, and the third blade is cut at a position on the side of the blade near the back cover plate with a depth of L that is half the width of the impeller outlet.
6. The method for cutting the closed impeller of the self-priming pump according to claim 5, wherein the cutting amount L of the closed impeller of the self-priming pump with 3 blades is 3 times of the cutting amount required when all the blades are completely cut.
7. The method for cutting the closed impeller of the self-priming pump according to claim 1, wherein for a self-priming pump closed impeller with 5 blades, the original outer diameter D of the closed impeller is kept unchanged, and then a first blade in the closed impeller is cut, namely the blade is milled at one side close to a front cover plate, wherein the depth is L, and the width is half of the width of an outlet of the impeller; then the second blade is not cut; next, cutting the third blade, namely milling the whole blade to a depth of L; then the fourth blade is not cut; and then cutting the fifth blade, and milling the blade at the side close to the rear cover plate, wherein the depth is L, and the width is half of the width of the outlet of the impeller.
8. The method for cutting the closed impeller of the self-priming pump according to claim 7, wherein the cutting amount L of the closed impeller of the self-priming pump with 5 blades is 2.5 times of the cutting amount required when all the blades are completely cut.
9. The method for cutting the closed impeller of the self-priming pump according to claim 1, wherein for a closed impeller of the self-priming pump with 7 blades, the original outer diameter D of the closed impeller is kept unchanged, and then a first blade in the closed impeller is cut, namely the blade is milled at one side close to a front cover plate, wherein the depth is L, and the width is half of the width of an outlet of the impeller; then the second blade is not cut; next, cutting the third blade, namely milling the whole blade to a depth of L; then the fourth blade is not cut; next, cutting the fifth blade, namely milling the whole blade to a depth of L; cutting the sixth blade; and then cutting the seventh blade, and milling the blade at the side close to the rear cover plate, wherein the depth is L, and the width is half of the width of the outlet of the impeller.
10. The method for cutting the closed impeller of the self-priming pump according to claim 9, wherein the cutting amount L of the closed impeller of the self-priming pump with 7 blades is 2.34 times of the cutting amount required when all the blades are completely cut.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111572577.6A CN114260492B (en) | 2021-12-21 | 2021-12-21 | Closed impeller cutting method of self-priming pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111572577.6A CN114260492B (en) | 2021-12-21 | 2021-12-21 | Closed impeller cutting method of self-priming pump |
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| CN114260492A true CN114260492A (en) | 2022-04-01 |
| CN114260492B CN114260492B (en) | 2024-04-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203476789U (en) * | 2013-08-29 | 2014-03-12 | 上海东方泵业(集团)有限公司 | Stainless steel double-suction centrifugal pump impeller |
| CN207568928U (en) * | 2017-11-10 | 2018-07-03 | 江苏国泉泵业制造有限公司 | A kind of novel fractional centrifugation impeller of pump |
| WO2019075777A1 (en) * | 2017-10-18 | 2019-04-25 | 江苏大学 | Optimal design method for jet-type self-priming centrifugal pump |
| US20200039009A1 (en) * | 2017-02-10 | 2020-02-06 | Dalian University Of Technology | Double-row Slot Plunge Milling Processing Method for Integral Impellers |
-
2021
- 2021-12-21 CN CN202111572577.6A patent/CN114260492B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203476789U (en) * | 2013-08-29 | 2014-03-12 | 上海东方泵业(集团)有限公司 | Stainless steel double-suction centrifugal pump impeller |
| US20200039009A1 (en) * | 2017-02-10 | 2020-02-06 | Dalian University Of Technology | Double-row Slot Plunge Milling Processing Method for Integral Impellers |
| WO2019075777A1 (en) * | 2017-10-18 | 2019-04-25 | 江苏大学 | Optimal design method for jet-type self-priming centrifugal pump |
| CN207568928U (en) * | 2017-11-10 | 2018-07-03 | 江苏国泉泵业制造有限公司 | A kind of novel fractional centrifugation impeller of pump |
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| CN114260492B (en) | 2024-04-09 |
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