CN215789170U - Centrifugal pump with stirring function for magnetorheological polishing - Google Patents
Centrifugal pump with stirring function for magnetorheological polishing Download PDFInfo
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- CN215789170U CN215789170U CN202121923250.4U CN202121923250U CN215789170U CN 215789170 U CN215789170 U CN 215789170U CN 202121923250 U CN202121923250 U CN 202121923250U CN 215789170 U CN215789170 U CN 215789170U
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Abstract
The utility model relates to the technical field of magnetorheological polishing, and provides a centrifugal pump with a stirring function for magnetorheological polishing, which comprises a stirring mechanism assembly, wherein the stirring mechanism assembly comprises a stirring tank and a spiral stirring paddle, a stirring liquid outlet is eccentrically arranged at the bottom of the stirring tank, and an inverted cone streamline cavity is arranged in the stirring tank; and the centrifugal mechanism assembly comprises a centrifugal pump, the centrifugal pump is provided with a pump body liquid inlet and a pump body liquid outlet, the pump body liquid inlet is higher than the pump body liquid outlet, the pump body liquid inlet is connected with the stirring liquid outlet through a liquid inlet pipe, and the pump body liquid outlet is connected with the stirring tank through a return pipeline. The stirring tank is cylindrical outside, and the inner cavity is in a reversed conical streamline shape with the liquid outlet eccentrically arranged, so that the phenomenon of swirling in the process of stirring the magnetorheological polishing solution can be avoided, the flowing dead angle of the magnetorheological polishing solution can be avoided, the liquid discharge in the pumping circulation process is promoted, and the problem that the magnetorheological polishing solution is easy to precipitate and agglomerate due to structural factors is solved.
Description
Technical Field
The utility model relates to the technical field of magnetorheological polishing, in particular to a centrifugal pump with a stirring function for magnetorheological polishing.
Background
Magnetorheological polishing is a deterministic and controllable flexible optical manufacturing technology that utilizes the rheological properties of magnetorheological fluids to perform processing. Compared with the traditional polishing technology, the technology has the remarkable process characteristics of high processing precision, high convergence efficiency, few defects of a processed surface and the like, can efficiently and inexpensively solve the problem of ultra-precision processing of a plane and an aspheric surface, is known as a revolutionary technology in the optical manufacturing industry, and has good application prospect. The magnetorheological polishing solution circulating system is a core unit of a magnetorheological polishing machine tool, is responsible for circulation, stirring, temperature control, flow control and viscosity control of the magnetorheological polishing solution, and determines the pumping efficiency and the pumping stability of the magnetorheological polishing solution. The centrifugal pump for magnetorheological polishing is used as a power source of the whole circulating system, and the performance of the centrifugal pump has great influence on the magnetorheological polishing effect.
The prior patent CN111515763A, the patent name "a split type pumping circulation device", discloses a device comprising a liquid storage tank and a stirring paddle, wherein an output end of the liquid storage tank is used for being connected with an input end of a pump body of a centrifugal pump for magnetorheological polishing through a transmission pipe, and an input end of the liquid storage tank is used for being connected with an output end of the pump body of the centrifugal pump for magnetorheological polishing through the transmission pipe; the stirring paddle is used for stirring the magnetorheological polishing liquid in the liquid storage tank.
The magnetorheological polishing solution circulating system combining the patent and the existing stirring tank with the centrifugal pump has a common problem: according to the stirring and mixing mechanism and the stirring flow pattern analysis, in the stirring tank, the mechanical energy is transferred to the fluid to drive the fluid to flow through the rotation of the stirring paddle, so that the fluid in different areas of the stirring tank is forced to flow in a convection mode, and the method belongs to macro mixing. The flow direction of the axial flow is parallel to the stirring shaft, and the fluid flows downwards under the pushing of the blades and then turns upwards after contacting the bottom surface of the stirring tank to form axial circulating flow which is the main power for promoting the macro mixing. Therefore, the flow pattern that plays a major role in mitigating slurry particle soft agglomeration and large particle settling is axial flow. The radial flow mainly realizes the uniform mixing of the polishing solution around the stirring blade, and the tangential flow can weaken the mixing effect. Tangential flow occurs when a fluid of not high viscosity is stirred at high speed, whether it is an axial flow paddle or a radial flow paddle, when it is installed in the center of the tank. When the wall surface of the stirring tank is smooth and has no baffle, the polishing liquid in the tank can do integral rotation motion along the circumferential direction and flow towards the tank wall under the action of centrifugal force, so that the liquid level of the peripheral part rises along the tank wall, the liquid level of the central part falls, and a large vortex is formed, and the flow form is called as 'swirling'. When the impeller is swirled, the polishing solution only rotates along with the impeller and does not move axially or radially, the flow of the fluid from the periphery of the impeller to the impeller area is very small, and the mixing chance is almost avoided, so that the solid-liquid separation of the polishing solution is easily caused. Along with the increase of the stirring rotating speed, the liquid level of the stirring tank is gradually concave downwards, and the effective volume in the stirring tank is continuously reduced. When the center of the liquid surface vortex is sunken to be contacted with the paddle, the external air is sucked into the polishing solution under the driving of the paddle to cause the density change of the polishing solution. In addition, because the paddle is contacted with a gas-liquid mixture with low density, the stirring effect is greatly reduced and mechanical vibration is generated.
Therefore, how to solve the above problems becomes a focus of research by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a centrifugal pump with a stirring function for magnetorheological polishing, and aims to solve the problem of the prior art.
The embodiment of the utility model is realized by the following technical scheme:
a centrifugal pump with stirring function for magnetorheological polishing comprises:
the stirring mechanism assembly comprises a stirring tank and a spiral stirring paddle arranged in the stirring tank, wherein a stirring liquid outlet is eccentrically arranged at the bottom of the stirring tank, and an inverted cone streamline cavity is formed in the stirring tank;
and the centrifugal mechanism assembly comprises a centrifugal pump, the centrifugal pump is provided with a pump body liquid inlet and a pump body liquid outlet, the pump body liquid inlet is higher than the pump body liquid outlet, the pump body liquid inlet is connected with the stirring liquid outlet through a liquid inlet pipe, and the pump body liquid outlet is connected with the stirring tank through a detachable return pipe.
Further, rabbling mechanism assembly still includes the fixed station, the fixed station is provided with a plurality of constant head tanks, the bottom of agitator tank be provided with the boss that the constant head tank matches, the agitator tank inserts through the boss the constant head tank is interior fixed with the fixed station.
Further, agitator tank upper end is provided with the detachable top cap, be provided with agitator motor on the top cap, agitator motor passes through the stirring shaft coupling and is connected with the screw-tupe stirring rake.
Further, the screw type stirring paddle comprises a stirring shaft and a stirring paddle blade, wherein the stirring shaft is sequentially provided with a stirring upper bearing end cover, a stirring upper bearing, a stirring lower bearing end cover, a stirring lower bearing and a stirring sealing ring from top to bottom.
Furthermore, the stirring shaft is made of hard aluminum, the outer diameter surface of the stirring shaft is coated with a layer of polytetrafluoroethylene, and the stirring blades are made of polytetrafluoroethylene.
Furthermore, be equipped with a plurality of liquid filling openings on the top cap, liquid filling opening adaptation has liquid filling opening stopper, liquid filling opening stopper middle part is equipped with the backward flow mouth, and the backward flow mouth is adapted to have backward flow mouth stopper, and the backward flow mouth is connected the back flow.
Furthermore, a rotating shaft, a centrifugal impeller and a water pumping chamber are arranged in the centrifugal pump, and the centrifugal impeller is arranged at the tail end of the rotating shaft and is positioned in the water pumping chamber.
Further, centrifugal mechanism assembly still includes centrifugal motor, centrifugal motor passes through centrifugal shaft coupling and is connected with the pivot, and is provided with centrifugal sealing ring, centrifugation lower bearing end cover, centrifugation upper bearing and centrifugation upper bearing end cover in the pivot from bottom to top.
Further, a flange groove is formed in the position of the liquid outlet of the pump body, a sealing flange is arranged in the flange groove, and a flange sealing ring is arranged between the sealing flange and the liquid outlet of the pump body.
Further, the agitator tank and the centrifugal pump are both provided with side holes.
The technical scheme of the embodiment of the utility model at least has the following advantages and beneficial effects:
the stirring tank is cylindrical outside, and the inner cavity is in a reversed cone streamline shape with the liquid outlet eccentrically arranged, so that the phenomenon of swirling in the process of stirring the magnetorheological polishing solution can be avoided, the flowing dead angle of the magnetorheological polishing solution can be avoided, the liquid discharge in the pumping circulation process is promoted, and the problem that the magnetorheological polishing solution is easy to precipitate and agglomerate due to structural factors is solved. In addition, the impact action of the backflow magnetorheological polishing solution flow can bring the polishing solution attached to the tank wall of the stirring tank into the pump body of the centrifugal pump, so that the stability of the properties of the polishing solution is ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a magnetorheological polishing centrifugal pump with an agitation function according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a rotating shaft and a screw type stirring paddle;
FIG. 3 is a schematic structural view of a top cover of the stirring tank;
FIG. 4 is an isometric view of a blender jar;
FIG. 5 is a bottom view of the agitator tank;
FIG. 6 is a schematic view of the structure of the fixed table;
fig. 7 is a schematic view of the structure of the centrifugal pump.
Icon: 1-stirring motor, 2-reflux opening plug, 3-liquid filling opening plug, 4-top cover, 5-stirring tank, 6-fixed platform, 7-bottom cover, 8-sealing flange, 9-reflux pipe, 10-centrifugal pump, 11-liquid inlet pipe, 12-centrifugal motor, 13-stirring coupler, 14-stirring upper bearing end cover, 15-stirring upper bearing, 16-stirring lower bearing end cover, 17-stirring lower bearing, 18-stirring sealing ring, 19-stirring shaft, 20-bottom cover sealing ring, 21-centrifugal impeller, 22-rotating shaft, 23-centrifugal sealing ring, 24-centrifugal lower bearing, 25-centrifugal lower bearing end cover, 26-centrifugal upper bearing, 27-centrifugal upper bearing end cover, 28-centrifugal coupler, 29-flange sealing ring, 30-liquid filling port, 31-stirring shaft hole, 32-stirring liquid outlet, 33-boss, 34-positioning groove, 35-impeller shaft hole, 36-pump body liquid inlet, 37-pressurized water chamber, 38-pressurized water chamber flow channel, 39-pump body liquid outlet and 40-stirring paddle.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. 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.
Example 1
Referring to fig. 1 to 7, the present embodiment provides a centrifugal pump for magnetorheological polishing with stirring function, including a stirring mechanism assembly and a centrifugal mechanism assembly, where the stirring mechanism assembly and the centrifugal mechanism assembly are disposed on the same bottom cover 7.
Rabbling mechanism assembly includes agitator motor 1, agitator tank 5, screw-tupe stirring rake and fixed station 6, fixed station 6 is fixed in bottom 7, and the up end of fixed station 6 is provided with a plurality of constant head tanks 34, agitator tank 5's bottom be provided with the boss 33 that constant head tank 34 matches, agitator tank 5 inserts through boss 33 fixed with fixed station 6 in the constant head tank 34 to restriction agitator tank 5 removes. The stirring tank 5 is internally provided with the spiral stirring paddle, and the stirring paddle comprises a stirring shaft 19 and stirring blades 40. Screw fixedly connected with top cap 4 is passed through on the top of agitator tank 5, agitator motor 1 install in on top cap 4, agitator motor 1's output passes through stirring shaft coupling 13 and is connected with (mixing) shaft 19, 19 top-down at (mixing) shaft have set gradually stirring upper bearing end cover 14 simultaneously, stir upper bearing 15, under the stirring bearing end cover 16, under the stirring bearing 17 and stirring sealing ring 18, through be provided with the duplex bearing structure on (mixing) shaft 19, guarantee its and agitator motor 1 output shaft's axiality, thereby the stable rotation of (mixing) shaft 19 and stirring paddle leaf 40 has been ensured, and the clearance between stirring shaft hole 31 and the (mixing) shaft 19 can be sealed in the setting of stirring sealing ring 18, in order to prevent that the magnetic current becomes polish and scurry, then protect agitator motor 1.
In addition, the temperature of the magnetorheological polishing solution is gradually increased in the polishing process, the magnetorheological polishing solution has abrasion and corrosion effects on contacted objects and certain ferromagnetism, and the magnetorheological polishing solution is easy to agglomerate and adhere to the contacted objects to form hard blocks after being cooled. In order to take account of the factors of mechanical strength, high temperature resistance, corrosion resistance, ageing resistance, no magnetism, no adhesion, cost performance and the like, the stirring shaft 19 is made of duralumin, a layer of polytetrafluoroethylene is coated outside the stirring shaft 19, and the stirring blades 40 are made of polytetrafluoroethylene. The zero field viscosity of the water-based magnetorheological polishing solution is basically within 1.5 pas, and the water-based magnetorheological polishing solution belongs to a solid-liquid two-phase suspension with medium viscosity. Wherein the solid particle content is large, the coagulation is easy to occur under the conditions of low temperature and insufficient stirring, and the viscosity is greatly increased along with the coagulation. In addition, the polishing solution also has the shear thinning characteristic and is suitable for stirring by adopting a stirring paddle with small shearing force and large viscosity application range. The spiral stirring paddle belongs to an axial flow type stirring paddle, has lower shearing force, has smaller shearing thinning effect on non-Newtonian fluid, causes smaller turbulence intensity and higher liquid discharge capacity, and is beneficial to improving the solid suspension and flow mixing effect of the magneto-rheological polishing liquid in the stirring tank 5. The spiral stirring paddle can ensure the circulation flow of the magnetorheological polishing liquid at the upper layer, the middle layer and the lower layer in the stirring tank 5, and can effectively exchange the magnetorheological polishing liquid near the stirring paddle shaft and in the area close to the tank wall, so that the comprehensive and uniform mixing of the magnetorheological polishing liquid in the stirring tank 5 is finally realized. In addition, the smaller the number of the stirring blades 40, the less the mechanical stability of the stirring blade in the rotation process, and the less the driving force, so that the stirring blade with the number of blades of 4 is selected in the design process of the stirring blade.
The bottom of the stirring tank 5 is eccentrically provided with a stirring liquid outlet 32, the stirring tank 5 is cylindrical, and the inside of the stirring tank 5 is a reverse taper streamline cavity, as shown in fig. 4, the reverse taper streamline is that the opening part is slightly larger than the bottom, the bottom is slightly inclined, and the liquid outlet 32 is positioned at the lower end of the bottom, so that the phenomenon of 'spin-up' in the stirring tank 5 can be effectively prevented. The top cap 4 is equipped with a plurality of liquid filling openings 30, liquid filling opening 30 adaptation has liquid filling opening stopper 3, liquid filling opening stopper 3 middle part is equipped with the backward flow mouth, and the backward flow mouth is adapted to have backward flow mouthful stopper 2.
The centrifugal mechanism assembly comprises a centrifugal motor 12 and a centrifugal pump 10, wherein the centrifugal motor 12 is arranged at the top end of the centrifugal pump 10, and the centrifugal pump 10 is connected with the bottom cover 7 through screws so as to be convenient for dismounting and cleaning the centrifugal pump 10. Meanwhile, the centrifugal pump 10 and the bottom cover 7 are sealed through a bottom cover sealing ring 20, so that leakage and energy loss of the magnetorheological polishing solution are avoided. The centrifugal pump 10 is internally provided with a rotating shaft 22, a centrifugal impeller 21 and a water pumping chamber 37, the lower end of the rotating shaft 22 penetrates through an impeller shaft hole 35 to be connected with the centrifugal impeller 21 in the water pumping chamber 37 through screws, and the mechanical energy of the magnetorheological polishing solution is improved through the acceleration of the centrifugal impeller 21 and the pressurization of the water pumping chamber 37. The output end of the centrifugal motor 12 is connected with the rotating shaft 22 through a centrifugal coupler 28, and the rotating shaft 22 is provided with a centrifugal sealing ring 23, a centrifugal lower bearing 24, a centrifugal lower bearing end cover 25, a centrifugal upper bearing 26 and a centrifugal upper bearing end cover 27 from bottom to top. Similarly, the double bearing structure is arranged on the rotating shaft 22 to ensure the coaxiality of the rotating shaft 22 and the output shaft of the centrifugal motor 12, so that the stable rotation of the rotating shaft 22 and the centrifugal impeller 21 is ensured, and the centrifugal sealing ring 23 is arranged to seal the gap between the hole of the rotating shaft 22 and the rotating shaft 22 so as to prevent the magnetorheological polishing solution from flowing upwards and further protect the centrifugal motor 12.
The top cover 4 and the centrifugal pump 10 are both provided with side holes, so that the turning and sealing conditions of the motor shaft can be observed, the centrifugal impeller 21 is prevented from rotating reversely to cause the centrifugal pump to lose pumping power, and meanwhile, the phenomenon that the centrifugal pump is damaged because excessive magnetorheological polishing liquid or the magnetorheological polishing liquid is added into the stirring tank 5 to cause 'swirling' is avoided.
Furthermore, the pumping flow stability of the centrifugal pump is greatly related to the flowing state of the magnetorheological polishing solution, and when the magnetorheological polishing solution flows in the stirring tank, three states of laminar flow, transitional flow and turbulent flow exist. Magnetorheological finishingWhen the liquid is in a laminar flow state, the flow stability is better; when the magnetorheological polishing solution is in a transitional flow state, the flow has small pulsation; when the magnetorheological polishing solution is in a turbulent flow state, the flow stability is poor. The state of which can be represented by the Reynolds number R of stirringeThe results are shown in Table 1.
TABLE 1 Reynolds number vs. flow regime relationship
Reynolds number of agitation ReIs defined as:
in the formula: reReynolds number of the stirrer, d-diameter of the stirrer vessel (mm), n-speed of the stirrer (r/min), p-density of the liquid (kg/m3), μ -viscosity of the liquid (mPas).
In addition, the more violent the axial circulating flow caused in the stirring process, the stronger the influence of the pumping action of the stirring blades, the smaller the liquid output amount of the stirring tank and the lower the pumping efficiency of the centrifugal pump. In order to ensure the pumping efficiency and the pumping flow stability, the rotating speed of the stirring paddle is adjusted in a lower speed range according to the diameter of the stirring tank and the density and viscosity of the magnetorheological polishing solution, so that the flowing state of the magnetorheological polishing solution is kept in a transitional flow range, even a laminar flow range, the overall circulating flow of the magnetorheological polishing solution is improved, and a solid-liquid phase is uniformly mixed.
When the magnetorheological polishing fluid flows into the curved flow channel, the magnetorheological polishing fluid is separated from the wall surface to form a vortex area, and local loss is caused. In addition, due to the high viscosity of the magnetorheological polishing solution, the flow velocity of the polishing solution near the wall surface of the flow channel is small, and the polishing solution flows from the outer side to the inner side along the pipe wall under the action of the internal and external pressure difference, and meanwhile, the polishing solution in the center of the pipe flows to the outer wall surface to form spiral transverse flow, so that the polishing solution generates energy loss, and the pumping efficiency of the centrifugal pump 10 is reduced. In addition, the flow rate of each part of the polishing solution is redistributed after the polishing solution passes through the corner, so that the relative movement between the solid phase and the liquid phase is accelerated, further friction and impact are caused, and the pumping flow stability and the pumping viscosity stability of the centrifugal pump 10 are reduced.
The local loss coefficient ζ of the meandering channel may be calculated as follows:
in the formula, zeta-local loss coefficient, d-pipe diameter, curvature radius of R-curved flow channel midline and theta-bending angle of the pipeline.
From the formula (2), it can be known that the local loss of the magnetorheological polishing solution at the bent flow channel depends on the diameter of the flow channel, the radius of curvature and the bending angle of the flow channel. Therefore, when designing the flow path, dead bends with excessively large turning angles are avoided as much as possible in order to reduce local loss.
Further, when the magnetorheological polishing solution flows in the flow channel with the equal section diameter, friction force is generated between the polishing solution and the wall surface and between molecules of the polishing solution due to the influence of high viscosity and roughness of the wall surface of the flow channel, and the shear stress causes loss of on-way resistance to the movement of the polishing solution. When the magnetorheological polishing solution flows in a laminar flow, the flow resistance comes from the internal friction force among the flow layers of the magnetorheological polishing solution; when the magnetorheological polishing fluid is in turbulent flow, the flow resistance comes from two aspects: on the one hand, the internal friction of the laminar bottom layer; another aspect is the additional resistance to momentum exchange such as particle mixing, collisions, etc. within the turbulent core region. However, the loss along the way, whether laminar or turbulent, can be calculated using the darcy-weisbach equation:
in the formula, lambda-on-way resistance coefficient, l-flow channel length, d-flow channel diameter, and v-flow velocity.
As can be seen from the formula (3), the magnitude of the on-way resistance loss increases with the increase of the length of the flow channel, the flow rate and the viscosity of the polishing solution; decreases as the diameter of the flow passage increases. The on-way resistance loss of the magnetorheological polishing solution during turbulent motion is greatly influenced by the roughness K of the flow channel; when the polishing solution performs laminar flow movement, the movement speed of the fluid is slow, and the fluid does not collide with the wall surface of the flow channel much, so that the roughness K of the flow channel has no influence on the resistance and the friction coefficient, and the lambda is only related to Re. Therefore, in designing the flow channel, in order to reduce the on-way loss, the length of the flow channel is reduced and the diameter of the flow channel is increased within a certain range.
As can be seen from the above, when the centrifugal pump 10 with stirring function for magnetorheological polishing provided in this embodiment is used in a circulation system of magnetorheological polishing liquid, the stirring liquid outlet 32 is connected to the liquid inlet 36 of the pump body through the liquid inlet tube 11; then the return pipe 9 is taken down from the pump body liquid outlet 39, one end of a liquid conveying pipe is connected with the pump body liquid outlet 39, and the other end of the liquid conveying pipe is connected with the polishing liquid injection device; then a return pipe 9 is used for connecting a recovery pump of the magnetorheological polishing solution circulating system with a liquid filling port 30;
before the circulation system works, the magnetorheological polishing solution is added into the clean and impurity-free stirring tank 5 from the liquid filling port 30. The recovery pump and the centrifugal pump 10 are started in sequence, with the transfer pipe connection being guaranteed to be correct.
When the circulating system works, the screw type stirring paddle improves the homogenization effect on the magnetorheological polishing solutions with different viscosities by controlling the rotating speed of the stirring motor 1, and the temperature sensor monitors the temperature of the magnetorheological polishing solutions so as to stabilize the temperature of the magnetorheological polishing solutions by adjusting the temperature of the water cooling machine. The magnetorheological polishing solution is pumped into the liquid conveying pipe by the centrifugal pump 10 and is sprayed to the polishing wheel through the nozzle; then, the magnetorheological polishing fluid is brought into a polishing area by a rotating polishing wheel; after the magnetorheological polishing solution rotates for a circle, the recoverer recovers the magnetorheological polishing solution leaving the polishing area into the pipeline and pumps the magnetorheological polishing solution into the stirring tank 5 by the recovery pump.
In summary, the centrifugal pump with stirring function for magnetorheological polishing provided by this embodiment has the following advantages:
1. the utility model combines the design principle of the conventional magnetorheological polishing pumping circulation system and is suitable for homogenizing, supplying and circulating the polishing solution in the magnetorheological polishing machine tool.
2. The good sealing effect of the top cover 4 and the matching use of the liquid filling opening plug 3 and the backflow opening plug 2 reduce the water loss of the magnetorheological polishing liquid, prevent impurities in the air from being mixed into the magnetorheological polishing liquid to a certain extent, and ensure the stable property and the service life of the magnetorheological polishing liquid. Thereby improving the magnetorheological polishing quality.
3. The stirring tank 5 is cylindrical outside, and the inner cavity is in a shape of an inverted cone with an eccentrically arranged liquid outlet, so that the phenomenon of swirling in the process of stirring the magnetorheological polishing liquid can be avoided, the magnetorheological polishing liquid can be prevented from flowing dead angles, liquid drainage in the pumping circulation process is promoted, and the problem that the magnetorheological polishing liquid is easy to precipitate and agglomerate due to structural factors is solved. In addition, the impact action of the backflow magnetorheological polishing solution flow can bring the polishing solution attached to the tank wall of the stirring tank 5 into the centrifugal pump 10, so that the stability of the property of the polishing solution is ensured.
4. The stirring tank 5 has large liquid storage capacity, greatly improves the capacity of the magnetorheological polishing solution in the circulating system, and meets the requirement of high-efficiency magnetorheological polishing on high-flow pumping of the polishing solution. In addition, a cooling device, a sensor for detecting the state of the polishing solution, a polishing solution supplement and the like are conveniently arranged, and the friendliness of magnetorheological polishing operation is ensured.
5. The screw type four-blade stirring paddle is adopted to actively stir the magnetorheological polishing solution in the stirring tank 5, so that agglomeration or coarse particles are prevented from being mixed into the polishing solution to influence the stability and consistency of the removal characteristic of the magnetorheological polishing, and the polishing quality is ensured. In addition, the rotating speed of the stirring motor 1 can be adjusted according to the viscosity value of the magnetorheological polishing solution to achieve a better homogenization effect, and the pumping circulation of the polishing solution can be adjusted within a wide range according to the viscosity, so that the requirements of magnetorheological polishing of various materials are met. Axial circulating flow is formed during stirring, and the turbulence degree of the magnetorheological polishing solution is not high. Compared with an immersion centrifugal pump which adopts a passive homogenization structure with a rotating tank body, the slurry has a larger contact area with polishing liquid, can ensure that the polishing liquid in the middle of the liquid storage tank is stirred, and can force the polishing liquid in a near-wall area to carry out convection, so that the uniform suspension of a solid phase in a liquid phase is realized more efficiently, and the comprehensive homogenization effect of the magnetorheological polishing liquid is ensured.
6. The length of the rotating shaft 22 of the centrifugal pump 10 is short, and the radial vibration of the impeller is small, so that the flow pulsation in the pumping process is reduced, and the stability of the pumping flow is improved.
7. The liquid inlet of the centrifugal pump 10 is arranged at the upper end, the liquid outlet is arranged at the lower end, and the magnetorheological polishing liquid can automatically flow into the centrifugal pump 10 from the stirring tank 5 under the action of gravity, so that the trouble of priming in advance during starting is avoided. In addition, the magnetorheological polishing solution in the centrifugal pump 10 is sucked from the upper part and discharged from the side surface, so that the lift loss is reduced, and the motor efficiency is improved. Meanwhile, the curvature radius of the inner flow passage of the centrifugal pump 10 is large, and the local loss is small. In addition, the internal flow passage of the centrifugal pump 10 is short, and the on-way loss is reduced, so that the high-efficiency stable pumping of the magnetorheological polishing solution is realized.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a centrifugal pump is used in magnetic current becomes polishing with stirring function which characterized in that includes:
the stirring mechanism assembly comprises a stirring tank (5) and a spiral stirring paddle arranged in the stirring tank (5), wherein a stirring liquid outlet (32) is eccentrically arranged at the bottom of the stirring tank (5), and an inverted cone streamline cavity is formed in the stirring tank (5);
and a centrifugal mechanism assembly, which comprises a centrifugal pump (10), wherein the centrifugal pump (10) is provided with a pump body liquid inlet (36) and a pump body liquid outlet (39), the pump body liquid inlet (36) is higher than the pump body liquid outlet (39), the pump body liquid inlet (36) is connected with the stirring liquid outlet (32) through a liquid inlet pipe (11), and the pump body liquid outlet (39) is connected with the stirring tank (5) through a detachable return pipe (9).
2. The centrifugal pump with stirring function for magnetorheological polishing as claimed in claim 1, wherein: rabbling mechanism assembly still includes fixed station (6), fixed station (6) are provided with a plurality of constant head tanks (34), the bottom of agitator tank (5) be provided with boss (33) that constant head tank (34) match, agitator tank (5) insert through boss (33) fixed with fixed station (6) in constant head tank (34).
3. The centrifugal pump with stirring function for magnetorheological polishing according to claim 2, wherein: agitator tank (5) upper end is provided with detachable top cap (4), be provided with agitator motor (1) on top cap (4), agitator motor (1) is connected with the screw-type stirring rake through stirring shaft coupling (13).
4. The centrifugal pump with stirring function for magnetorheological polishing according to claim 3, characterized in that: the spiral stirring paddle comprises a stirring shaft (19) and stirring blades (40), wherein the stirring shaft (19) is sequentially provided with a stirring upper bearing end cover (14), a stirring upper bearing (15), a stirring lower bearing end cover (16), a stirring lower bearing (17) and a stirring sealing ring (18) from top to bottom.
5. The centrifugal pump with stirring function for magnetorheological polishing according to claim 4, wherein: the stirring shaft (19) is made of hard aluminum, the outer diameter surface of the stirring shaft is coated with a layer of polytetrafluoroethylene, and the stirring blades (40) are made of polytetrafluoroethylene.
6. The centrifugal pump with stirring function for magnetorheological polishing according to claim 4, wherein: be equipped with a plurality of liquid filling openings (30) on top cap (4), liquid filling opening (30) adaptation has liquid filling opening stopper (3), liquid filling opening stopper (3) middle part is equipped with the backward flow mouth, and backward flow mouth adaptation has backward flow mouth stopper (2), and backward flow mouth connection back flow (9).
7. The centrifugal pump with stirring function for magnetorheological polishing according to claim 1, characterized in that: a rotating shaft (22), a centrifugal impeller (21) and a pumping chamber (37) are arranged in the centrifugal pump (10), and the centrifugal impeller (21) is arranged at the tail end of the rotating shaft (22) and is positioned in the pumping chamber (37).
8. The centrifugal pump with stirring function for magnetorheological polishing according to claim 7, wherein: the centrifugal mechanism assembly further comprises a centrifugal motor (12), the centrifugal motor (12) is connected with the rotating shaft (22) through a centrifugal coupler (28), and a centrifugal sealing ring (23), a centrifugal lower bearing (24), a centrifugal lower bearing end cover (25), a centrifugal upper bearing (26) and a centrifugal upper bearing end cover (27) are arranged on the rotating shaft (22) from bottom to top.
9. The centrifugal pump with stirring function for magnetorheological polishing according to claim 1, characterized in that: the pump body liquid outlet (39) department is provided with the flange groove, be provided with sealing flange (8) in the flange groove, be provided with flange sealing washer (29) between sealing flange (8) and pump body liquid outlet (39).
10. The centrifugal pump with stirring function for magnetorheological polishing according to claim 1, characterized in that: the stirring tank (5) and the centrifugal pump (10) are both provided with side holes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117085552A (en) * | 2023-10-17 | 2023-11-21 | 中国科学院长春光学精密机械与物理研究所 | Inclined dynamic magnetorheological fluid storage and stirring device and stirring method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117085552A (en) * | 2023-10-17 | 2023-11-21 | 中国科学院长春光学精密机械与物理研究所 | Inclined dynamic magnetorheological fluid storage and stirring device and stirring method thereof |
| CN117085552B (en) * | 2023-10-17 | 2023-12-12 | 中国科学院长春光学精密机械与物理研究所 | Inclined dynamic magnetorheological fluid storage and stirring device and stirring method thereof |
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