CN112483461A - Radial force self-balancing method of single-blade centrifugal pump - Google Patents
Radial force self-balancing method of single-blade centrifugal pump Download PDFInfo
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- CN112483461A CN112483461A CN202011128086.8A CN202011128086A CN112483461A CN 112483461 A CN112483461 A CN 112483461A CN 202011128086 A CN202011128086 A CN 202011128086A CN 112483461 A CN112483461 A CN 112483461A
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- impeller
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- radial force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
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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
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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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
- F04D29/007—Details, component parts, or accessories especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a radial force self-balancing method of a single-blade centrifugal pump, which comprises the following steps: s1, according to CFD numerical simulation, improving the circumferential distribution symmetry of the flow field in the single-blade centrifugal pump by adopting a method of rotating center eccentricity of the impeller, and meanwhile, determining the size and position of the rotating center eccentricity of the impeller based on CFD numerical simulation and test measurement; s2 determining the position of the center of gravity and the required magnitude of the centrifugal force by combining CFD numerical simulation and experimental measurement, and using the centrifugal force generated by the center of gravity being offset from the center of rotation to generate an appropriate centrifugal force for balancing the radial force based on the calculated centrifugal force. The method of the invention balances the radial force generated when the pump operates, and improves the operation stability and reliability of the pump; the method is rapid and convenient, can greatly reduce the time consumed in the impeller counterweight processing process, and improves the counterweight efficiency.
Description
Technical Field
The invention belongs to the technical field of fluid machinery, particularly relates to a single-blade centrifugal pump, and particularly relates to a radial force self-balancing method of the single-blade centrifugal pump.
Background
Due to the asymmetric structure of the single-blade centrifugal pump, the mass of the single-blade centrifugal pump is difficult to balance, and meanwhile, the pressure circumference distribution of the impeller is asymmetric during operation, so that large hydraulic imbalance exists. This results in a single-vane centrifugal pump with a large residual radial force, which does not guarantee the operation stability and affects the service life of the pump. At present, manufacturers mainly adopt a method of balancing and cutting a cover plate of a single-blade centrifugal pump. In order to achieve balance with higher precision, multiple balance tests and cutting machining are often required. The method has the advantages of low production efficiency, high production cost, unsuitability for batch production, difficulty in balancing the hydraulic induced radial force and limitation on large-scale popularization and application of the single-blade centrifugal pump.
Disclosure of Invention
The invention aims to provide a method for self-balancing radial force of a single-blade centrifugal pump, which aims to solve the defects or problems in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for self-balancing radial force of a single-vane centrifugal pump, which is characterized by comprising the following steps:
s1, according to CFD numerical simulation, improving the circumferential distribution symmetry of the flow field in the single-blade centrifugal pump by adopting a method of rotating center eccentricity of the impeller, and meanwhile, determining the size and position of the rotating center eccentricity of the impeller based on CFD numerical simulation and test measurement;
s2, determining the position of the center of gravity and the required magnitude of the centrifugal force by combining the CFD values and the experimental measurements, and using the centrifugal force calculated to generate the appropriate centrifugal force by offsetting the center of gravity from the center of rotation, the appropriate centrifugal force being used to balance the radial forces.
Further, the method for decentering the rotation center of the impeller in the step S1 specifically includes the following steps: the method that the eccentricity and the position of the impeller are respectively fixed is adopted, and the influence of the eccentricity of the impeller on the internal flow field and the induced radial force of the single-blade centrifugal pump is analyzed by comparing different eccentric circumferential positions and eccentric amounts.
Further, in S1, after finding a better impeller center position by using CFD numerical simulation, the pump inlet position on the pump body is also made eccentric correspondingly.
Further, the method for deviating the center of gravity from the center of rotation comprises the following processes: the material is removed by adopting a rear cover plate to adjust the gravity center, the removed material area is set to be in a fan shape, the geometric center symmetric position of the fan shape is the gravity center position of the impeller, and the eccentric mass is determined by the depth of the removed material and the area of the fan shape; and according to the simulation result of the virtual machine, the impeller is weighted again, the process is repeated until the centrifugal force reaches the expected target, the gravity center is continuously adjusted to obtain the proper centrifugal force, and therefore the radial force is balanced by the centrifugal force.
Preferably, the balancing the impeller according to the simulation result obtained by the virtual machine includes the following steps: determining the geometric center of the material-removing fan-shaped structure according to the direction of the radial force; and determining the depth of the removed material and the sector area according to the magnitude of the centrifugal force.
Preferably, each time the weight is added, the radial force is balanced
In order to balance the residual radial force, the method of removing materials to make the center of gravity of the impeller eccentric is adopted for balancing, and the required centrifugal force
I.e. centrifugal forceF 2With residual radial forceF 1Equal in size and opposite in direction; centrifugal force is provided by removing scalloped material from the back cover plate
，VIn order to remove the volume of the material,
，r=(r 2+r 1) /2, determination from residual radial forcem、rAnd
further setting the size of the sector area and the depth of the removed material;
wherein:mwhich is the mass of the impeller,ωis the angular velocity of the impeller, in radians/second,ris the radius of the center of gravity,
is the density of the material of the impeller,hin order to remove the depth of the material,Vfor material removal volume, equal to the product of the sector area and the depth of material removal,r 1 is a sector-shaped lower arc-shaped radius,r 2 is the radius of the arc-shaped upper part of the sector,
is an arc angle.
The technical scheme of the invention has the following beneficial effects: in the invention, because of the asymmetry of the impeller structure of the single-blade centrifugal pump, in order to ensure that the flow field is in circumferential asymmetric distribution, the method of rotating the eccentric center of the impeller is adopted, the symmetry of the circumferential distribution of the flow field in the single-blade centrifugal pump can be improved, and the radial force borne by the impeller can be reduced by properly offsetting the center of the impeller to a certain direction; the method for self-balancing the radial force of the single-blade centrifugal pump balances the radial force generated during the operation of the pump, and improves the operation stability and reliability of the pump; the method is rapid and convenient to use, time consumed in the impeller counterweight processing process can be greatly reduced, and counterweight efficiency is improved.
Drawings
FIG. 1 is a block diagram of a single-vane centrifugal pump of the present invention;
FIG. 2 is an eccentric schematic view of a single-vane centrifugal pump of the present invention;
FIG. 3 is a radial force diagram of a single-vane centrifugal pump impeller in accordance with the present invention when the impeller is eccentric (2, -2);
FIG. 4 is a block diagram of the radial force self-adjusting impeller of the present invention; wherein, fig. 4A is a schematic view of an impeller;
FIG. 4B is a cross-sectional view of FIG. 4A;
FIG. 5 is a graph showing the results of the radial forces applied to the impeller under different flow conditions.
Description of reference numerals: 1. an inlet; 2. an impeller; 3. a pump chamber; 4. a volute; 5. and (7) an outlet.
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to the accompanying drawings, and the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments obtained by those skilled in the art without creative efforts based on the technical solutions of the present invention belong to the protection scope of the present invention.
A method for self-balancing radial force of a single-blade centrifugal pump comprises the steps of (1) improving the symmetry of the circumferential distribution of a flow field in the single-blade centrifugal pump, and (2) combining CFD numerical simulation and test measurement to manufacture a cutting type radial force self-adjusting impeller, wherein the centrifugal force is used for balancing the radial force. The method comprises the following specific steps:
(1) the method for improving the circumferential distribution symmetry of the flow field in the single-blade centrifugal pump by the method for eccentric rotation center of the impeller comprises the following specific implementation method:
referring to the structural schematic diagram of the single-blade centrifugal pump in fig. 1 and the eccentric schematic diagram of the impeller of the single-blade centrifugal pump in fig. 2, as shown in fig. 1 and fig. 2, the single-blade centrifugal pump of the present invention includes a volute 4, an inlet 1 and an outlet 5 are arranged on the volute 4, a pump chamber 3 is arranged inside the volute 4, and the impeller 2 is arranged inside the pump chamber 3; the centers of the impeller 2 and the volute 4 are shown in fig. 2, the center O of the volute 4 is located at the origin of coordinates, the center O' of the impeller 2 deviates from the center of coordinates, and the offset is the eccentricity e; and a cartesian coordinate system is established as shown in fig. 2 with the center O of the scroll 4 as an origin.
In order to obtain a proper eccentric position and eccentric distance, the method of respectively fixing the eccentric amount and position of the impeller is adopted, and the influence of the eccentricity of the impeller on the flow field and the induced radial force in the single-blade centrifugal pump is analyzed by comparing different eccentric circumferential positions and eccentric amounts. Taking a certain single-blade centrifugal pump as an example, four models a, b, c and d of impeller eccentricity at different circumferential positions are set through numerical calculation, the central coordinates of the impeller are respectively (0,1), (-1,0), (0, -1) and (1,0), namely the impeller eccentricity is 1mm and is located at four different circumferential positions, and the radial force borne by the impeller can be reduced by the impeller which deviates towards the positive x direction or the negative y direction according to the calculation result, namely the radial force borne by the impeller can be reduced by the impeller which deviates towards the fourth quadrant by a proper amount.
In order to compare the influences of different eccentric quantities, a calculation model with the eccentric quantity of 0.5mm and the impeller center position of (0,0.5) is set to be compared with other models, and the result shows that the impeller eccentric model of (0,1) is superior to the calculation model of (0, 0.5). Because the clearance between the outer diameter of the impeller 3 and the base circle single side of the volute 4 is smaller, and because the clearance of the opening ring is smaller, the impeller 3 is eccentric and larger, the impeller 2 at the opening ring is interfered with the pump body. Therefore, the eccentric position (2, -2) of the impeller 2 is set, and an attempt is made to find a more excellent center position of the impeller 2. After the central position of the superior impeller 2 is obtained, the position of the inlet 1 on the pump body is also eccentric correspondingly.
Fig. 3 shows the radial force applied to the impeller under the rated flow condition when the eccentric position of the impeller is (2, -2), and it can be seen from the graph that the time domain graph of the radial force applied to the impeller after the eccentricity is similar to that when the impeller is not eccentric, but the radial force applied to the front cover plate of the impeller is reduced, and the radial force applied to the impeller is also reduced.
(2) Combining CFD numerical simulation to manufacture a cutting type radial force self-adjusting impeller, and balancing a radial force by adopting a centrifugal force; the specific implementation method comprises the following steps:
the Pro/E impeller was introduced into ADAMS software, the material properties were set, and a rotating pair was added. The magnitude and position of the centrifugal force can be obtained according to the time of the wave crest and the wave trough in the force monitoring curve. According to the ADAMS simulation results, the impeller was re-weighted in Pro/E and the process repeated until the centrifugal force reached the desired target.
According to the found comparisonThe central position of the excellent impeller is calculated to obtain the proper eccentric force according to the radial forceF 1Determining the geometric center of the material-removing fan-shaped structure; the depth of the removed material and the sector area are determined according to the magnitude of the centrifugal force, and the self-balancing impeller is manufactured as shown in fig. 4.
Assuming that an excellent impeller center position is found, there is still a residual radial force after balancing
In order to balance the residual eccentric force, the method of removing materials to make the center of gravity of the impeller eccentric is adopted for balancing, and the required centrifugal force
I.e. centrifugal forceF 2With residual radial forceF 1Equal in size and opposite in direction. Centrifugal force is provided by removing scalloped material from the back cover plate
，VIn order to remove the volume of the material,
，r=(r 2+r 1) /2, determination from residual radial forcem、rAnd
further setting the size of the sector area and the depth of the removed material.
Wherein:mis the mass of the impeller, ω is the angular velocity of the impeller, in radians/second,ris the radius of the center of gravity,
is the density of the material of the impeller,hin order to remove the depth of the material,Vfor material removal volume, equal to the product of the sector area and the depth of material removal,r 1 is a sector-shaped lower arc-shaped radius,r 2 is the radius of the arc-shaped upper part of the sector,
is an arc angle.
The measurement result of the radial force of the single-blade centrifugal pump prepared by the invention after self-balancing is shown in fig. 5, fig. 5 is the result of the single-blade centrifugal pump impeller hydraulic force induced radial force obtained by simulating the result by using the CFD and the virtual machine after eccentric balancing of the impeller gravity center, and the results can be seen in the figure, under different flow working conditions (0.6)Q d，1.0Q d，1.4Q d) Below (Q dRated flow working condition), after self-balancing is realized, the radial force borne by the impeller is greatly reduced, and the method provided by the invention can better balance the radial force borne by the single-blade centrifugal pump impeller.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A method for self-balancing radial force of a single-blade centrifugal pump is characterized by comprising the following steps:
s1, according to CFD numerical simulation, improving the circumferential distribution symmetry of the flow field in the single-blade centrifugal pump by adopting a method of rotating center eccentricity of the impeller, and meanwhile, determining the size and position of the rotating center eccentricity of the impeller based on CFD numerical simulation and test measurement;
s2 determining the position of the center of gravity and the required magnitude of the centrifugal force by combining CFD numerical simulation and experimental measurement, and using the centrifugal force generated by the center of gravity being offset from the center of rotation to generate an appropriate centrifugal force for balancing the radial force based on the calculated centrifugal force.
2. The method for self-balancing the radial force of a single-blade centrifugal pump according to claim 1, wherein the method for decentering the rotation center of the impeller in the step S1 specifically comprises the following steps: the method that the eccentricity and the position of the impeller are respectively fixed is adopted, and the influence of the eccentricity of the impeller on the internal flow field and the induced radial force of the single-blade centrifugal pump is analyzed by comparing different eccentric circumferential positions and eccentric amounts.
3. The method for self-balancing the radial force of a centrifugal pump with single blade as claimed in claim 1, wherein the pump inlet position on the pump body is made eccentric correspondingly after the better impeller center position is found out by CFD numerical simulation in S1.
4. The method of claim 1 wherein the method of offsetting the center of gravity from the center of rotation comprises the steps of: the material is removed by adopting a rear cover plate to adjust the gravity center, the removed material area is set to be in a fan shape, the geometric center symmetric position of the fan shape is the gravity center position of the impeller, and the eccentric mass is determined by the depth of the removed material and the area of the fan shape; and according to the simulation result of the virtual machine, the impeller is weighted again, the process is repeated until the centrifugal force reaches the expected target, the gravity center is continuously adjusted to obtain the proper centrifugal force, and therefore the radial force is balanced by the centrifugal force.
5. The method for self-balancing the radial force of the single-blade centrifugal pump according to claim 4, wherein the balancing of the impeller according to the simulation result obtained by the virtual machine comprises the following steps: determining the geometric center of the material-removing fan-shaped structure according to the direction of the radial force; and determining the depth of the removed material and the sector area according to the magnitude of the centrifugal force.
6. The method of claim 5 wherein each balancing operation is based on the residual radial force after balancing
To balance the residual radial forces, useBalancing by removing material to make the centre of gravity of impeller eccentric, and centrifugal force
I.e. centrifugal forceF 2With residual radial forceF 1Equal in size and opposite in direction; centrifugal force is provided by removing scalloped material from the back cover plate
，VIn order to remove the volume of the material,
，r=(r2+r1) /2, determining m, based on the residual radial force,rAnd
further setting the size of the sector area and the depth of the removed material;
wherein: m is the mass of the impeller, ω is the angular velocity of the impeller in radians/sec,ris the radius of the center of gravity,
is the density of the material of the impeller,hin order to remove the depth of the material,Vfor material removal volume, equal to the product of the sector area and the depth of material removal,r 1 is a sector-shaped lower arc-shaped radius,r 2 is the radius of the arc-shaped upper part of the sector,
is an arc angle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116401767A (en) * | 2023-04-18 | 2023-07-07 | 中国航发湖南动力机械研究所 | Design method of blade body super-flying-off blade |
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