研究型腔壓力和結(jié)合型旋渦真空泵機(jī)油濾清器的動(dòng)態(tài)分析【中文3170字】【PDF+中文WORD】

研究型腔壓力和結(jié)合型旋渦真空泵機(jī)油濾清器的動(dòng)態(tài)分析【中文3170字】【PDF+中文WORD】,中文3170字,PDF+中文WORD,研究,壓力,結(jié)合,旋渦,真空泵,機(jī)油,濾清,動(dòng)態(tài),分析,中文,3170,PDF,WORD MMD-2 第 18 屆中國(guó)機(jī)構(gòu)與機(jī)器科學(xué)國(guó)際會(huì)議 1 Research on cavity pressure and dynamic analysis of oil filter vortex vacuum pump of conjunction profiles WANG Licun1 CHEN Yajuan2 WANG Xudong1 ZHANG Xianming1(1.Engineering Research Center for Waste Oil Recovery Technology and Equipment of Ministry of Education,Chongqing Technology and Business University,Chongqing,400067 2.Research Institute Eng.And Tech.,China Jialing Industry Croup,Co.,Ltd.400032)Abstract:The role of gas in the dynamic vortex disc in different directions can be divided into axial gas power,radial gas power and tangential gas power,and torque consist of overturning moment and the rotation torque.The dynamics of the oil filter vortex vacuum pump is the first step to study the dynamic balance of design,strength design and reliability analysis.The size,direction and role of location of the tangential gas power,radial gas power and the axial gas power were detailed analyzed,which happened in the each working chambers of the composite curve vortex vacuum pump.Completed derivation of the formula for calculating,and lay the foundation for the kinetic analysis.In order to provide a reasonable design basis for the selection of the prime mover,to provide the computing load of finite element analysis and to provide the calculations,theoretical foundation structural strength and analysis of power in the main components.Key words:Vortex vacuum pump;Conjunction profiles;Cavity pressure;Dynamic analysis 1 Introduction*The role of gas in the dynamic vortex disc in different directions can be divided into axial gas power,radial gas power and tangential gas power,and torque consist of overturning moment and the rotation torque.The dynamics of the oil filter vortex vacuum pump is the first step to study the dynamic balance of design,strength design and reliability analysis 1-2.The size,direction and role of location of the tangential gas power,radial gas power and the axial gas power were detailed analyzed,which happened in the each working chambers of the composite curve oil filter vortex vacuum pump 3-6.Completed derivation of the formula for calculating,and lay the foundation for the kinetic analysis.In order to provide a reasonable design basis for the selection of the prime mover,to provide the computing load of finite element analysis and to provide the calculations,theoretical foundation structural strength and analysis of power in the main components 7-10.2 The analysis of the gas power 2.1 The cavity pressure calculation National Natural Science Foundation of China(50805149),Chongqing Science and Technology Committee Science and Technology Project Foundation(cstc2011ac6086)Assuming that each cavity compression is adiabatic process:KKKsssisssiiiVhSSPPPPVhSS iPpressure in the chamber；sPpressure in the suction chamber；iVvolume of chamber；sVthe maximum volume in suction chamber；iSarea of chamber；sSthe maximum volume of suction chamber；hthe height of vortex plate；Kratio of specific heat；i=1,2,3.2.2 Gas power calculation Gas power calculation is the foundation of all the dynamic calculation,different vortex profiles with different gas strength calculation method,conjunction type line gas power calculation process is as follows.Role in dynamic vortex disk of gas power and torque as shown in figure 1.Power mainly consist of axes gas powertF,radial gas power rFand tangential gas powerF.Torque make up of overturning MMD-2 第 18 屆中國(guó)機(jī)構(gòu)與機(jī)器科學(xué)國(guó)際會(huì)議 2 momenttM,rotational momentM.Fig.1 the gas power and moment of the orbiting vortex （1）The tangent gas power The gas power imposed on the dynamic vortex disc along the eccentric shaft tangential direction,known as tangential gas power,with notation F.Tangential gas power is a kind of power to stop the crankshaft movement,as well as moving vortex disk rotation and the vortex disc overturning.Figure2 shows that points 1、2、3 are on the surface of the inner wall of the static vortex disk,while points 1、2、3 are on the surface of the outer wall of the dynamic vortex disc.Fig.2 Tangent gas power of the orbiting vortex When vortex surface which was separated by 11、22、33 on the vortex disc works in the position shown,the lower left parts are in the same compression chamber pressure equal everywhere,on the other hand,the upper right parts are in the different chamber where the pressures differ from each other.Owning to the wrap-line symmetry of the dynamic、static vortex disc and the definition of tangential power,the joint tangential power acting on the adjacent sealing chamber must through and perpendicular to the midpoint of the center connection,it is formed by the base circle of dynamic、static vortex disc.After all,the tangential power is caused by different pressure in the adjacent compression chamber.With the movement of the dynamic vortex disc,the gas pressure of the working chamber and the end face area of the cavity will change,so the tangential power along with the crank angle changes.The study object of this paper is a new composite curves wrap and there is no correction on the start line.Due to the requirement of the milling process,the beginning section of wrap and tool round will interfere,making the transition cavity connected to the exhaust chamber too early.And beginning with the exhaust angle,based on different corner moving,we will make separate discussions about the tangential powers suffered on the vortex disc.The exhaust angle is determined by the chapter 3,the tangential gas power on dynamic vortex disc can be divided into two major stages as the corner changes.At this stage,the working chamber formed from the dynamic、static vortex disc are suction chamber,compression chamber and the exhaust chamber.Therefore,the pressure difference between the suction chamber and compression chamber,the compression chamber and the exhaust chamber produced the MMD-2 第 18 屆中國(guó)機(jī)構(gòu)與機(jī)器科學(xué)國(guó)際會(huì)議 3 tangential power.The study object of this paper is a composite curves wrap,thus,the working chamber consist of different curves as the corner at different angular range,resulting in the change of the tangential power area and the total tangential power.Between the exhaust chamber and the compression chamber,the tangential power on the area of exhaust chamber is:11112()()()ioFh llr PP （1）Between the suction chamber and the compression chamber,the tangential power on the area of compression chamber is:22223()()ioFh llr PP （2）The tangential power on the area of suction chamber is:3333()()iosFh llr PP （3）And:P1pressure in the exhaust chamber；P2pressure in the compression chamber；P3pressure in the suction chamber；Pspressure of inlet air；1 il，2il，3il，1ol，2ol，3olare shown in the figure 2。Because of the connection between compression chamber and exhaust chamber,and the new suction chamber has not formed yet,10F,the calculation of 2Fand3Fare (2),(3).The total gas tangential power is sum of every tangential power active in various sections of the cutting area,and its calculation is:123FFFF （4）（2）Radial gas power Radial gas power is imposed along the connection line of base circle in the dynamic、static vortex disc,with notationrF.Radial gas powerrFdriven from the center of dynamic vortex disc to the center of static vortex disc,as for the adjustable eccentric vortex compression,Spindle eccentricity tends to decrease,so that the radial clearance to expand,increase the amount of gas leakage through the radial clearance,at the same time can also cause changes in the friction loss.In the exhaust chamber,the radial gads powers acting on the orbiting vortex is:11122()rFa h PP （5）In the compression chamber,the radial gads powers acting on the orbiting vortex is:21232()rFa h PP （6）Similarly,in the suction chamber,the radial gads powers acting on the orbiting vortex is:3132()rsFa h PP （7）The total radial power is:31112()rrisiFFa h PP （8）（3）Axial gas power The axial gas power is the most important gas power on the vortex of the oil filter vortex vacuum pump,is also one of the main drawback of the vortex vacuum pump,with notationtF.As is shown in figure 3,the axial gas power applied along the eccentric shaft axis direction moving the dynamic vortex disc,moving dynamic vortex disc along the axial deviation to the static vortex disc,increasing the axial clearance,resulting in the increase of radial gas leak,reducing the volumetric efficiency of the vacuum pump.To avoid this,we must calculate the axial power generated by the compressed gas,and try to balance the gas axial power reliably and reasonably.MMD-2 第 18 屆中國(guó)機(jī)構(gòu)與機(jī)器科學(xué)國(guó)際會(huì)議 4 Fig.3 The influence of the power of axis In the figure 3,1 is fixed vortex plate,2 is dynamic vortex disc,and 3 is stand.This study focus on the conjunction lines based on the arc,the vortex of the intermediate compression chamber and the suction chamber constitute incomplete base circle involutes,which can be made up of arcs and circle involutes.In the exhaust chamber,due to the circle involutes profile,the suffered area of axial gas power on dynamic vortex disc is（2.10）and（2.11）,that is:S1332211530.6(1.2)322aa （9）3322111970.61.2322aSa （10）We can respectively calculate the axial power area in accordance with the profile of the intermediate compression chamber and the suction chamber at the different corner:In the intermediate compression chamber,and 0A，that is 00.44，we can calculate the axial power area:S2223(1.37)()()(21.37)AAAa 221(0.6)(2)(20.6)(2)BBBa22122()()2sin()BAAARRR r22sin()tan()2AAr 22sintan()cot()2ABr （11）Firstly,AB，that is 0.441.25，we can get the axial area:S2221(0.6)(2)Ba(2)(20.6)BB222121()()sin22BRRr22sincot()BAr （12）Secondly,2B，that is 1.252，we can get the axial area:2S22140.63/a（13）In the suction chamber,Firstly 0A，that is 00.44，we can get the axial area:3S22341.375/a （14）Secondly 2A，that is 0.442，we can get the axial area:3S22334()(5)a2212sin(22)2AArR 2222sin()sin()2AArRr222sin()cos2AArRarcR 233()(2)AAEAa （15）So the axial gas power on the dynamic vortex disc is:As shown in Figure 5,the spindle force as follows:Fig.5 The force of principal axis 3 Spindle power analysis MMD-2 第 18 屆中國(guó)機(jī)構(gòu)與機(jī)器科學(xué)國(guó)際會(huì)議 5 1KnstisiiVFSpV 3312312KKsssVVSpSpS pVV （16）sp is inhale pressure of conjunction profile oil filter vortex vacuum pump,K is Ratio of Specific Heat.(4)The overturning moment Moving vortex disc movement of the crank pin,the point is not the same perpendicular to the axis of the plane,thus causing dynamic vortex disc overturning due to the cut of point to the resultant force F of the gas force and radial gas forces and drive the overturning moment:2212ttMFHFFFhHh (17)Where h the height of the line-vortex;the distance between the h1-vortex disk drive surface.Overturning moment will increase the gap between the static and dynamic vortex disc uneven,hindering one of the main factors of the oil filter vortex vacuum pump mechanical efficiency and volumetric efficiency.(5)Rotation torque When the base circle center as the moving vortex disk drive center,perpendicular to the tangential direction of the crankshaft,the tangential gas force role in the midpoint of the dynamic vortex disc round and static vortex disc base circle center,so have a moving vortex coiled spindle eccentric line rotating torque,that is,the rotation torque,its direction and moving vortex disk rotation in the same direction.The rotation torque will destroy the normal work of the oil filter vortex vacuum pump,and so must be used in the structural design of the anti-rotation mechanism to strictly limit the rotation of the moving vortex disc.Known gas cut to the force applied to the midpoint of the crank for the analysis of the rotation torque point of the tangential force from the crank centerline to the crank pin center line,shown in figure 4.Tangential force to move to the center of the crank pin,crank pin just cut to the force F role,but also a moment the force M role.Fig.4 Transplant chart of tangent force Torque to force Mthe movement vortex coil crank pin center line along the direction of rotation of the vortex disc revolution;it is called the rotation torque by the following equation for:12MrF 12312r FFF (18)4 Conclusions MMD-2 第 18 屆中國(guó)機(jī)構(gòu)與機(jī)器科學(xué)國(guó)際會(huì)議 Vortex disk automatically cut to the force,eccentric reaction forcesF.The size and role in the direction of the moving vortex disc,the total cut of the same forceBrF,F acting perpendicular to the eccentric sleeve hole center line,the role of the outside in the radial direction.Spindle and eccentric face and eccentric hole on the bottom surface has a compression chamber to the introduction of the back pressure p,so the downward force acting on the spindleF214FD p.The reaction force1Z2Z,the cuts from the main and auxiliary bearings1RZ2RZ,radial reaction force,the axial reaction forcestF.Balance the weight of rotary inertia force 21 1m r 22 2m rand moment of inertia.The frictional torque of the main and sub bearing frictional torque1BM 2BM,dynamic vortex disc crank pinBrM.The driving torque from the drive mechanism 12TTBBMMMM.In the design study of vortex profiles,aiming at the restriction of single profile and its ameliorating or parameter optimization presently,the conjunction profiles bearing on arc-length and circle involutes were studied.This first derived conjunction of line of oil filter vortex vacuum pumps cut to the radial and axial gas force,overturning moment and the rotation torque calculation formula based on the conjunction of line oil filter vortex vacuum pumps.Cross slip ring,moving vortex disc,spindle three main components of the stress analysis,the dynamic equilibrium of the oil filter vortex vacuum pump design,strength design and reliability analysis has laid a solid foundation.Aknowledgments This work was supported by National Natural Science Foundation of China(50805149),Chongqing Science and Technology Committee Science and technology Project Foundation(cstc2011ac6086).Chongqing Education Committee Science and technology Project Foundation(kj110710),Chongqing University of Science and Technology Projects(kjtd201019,kjtd11211),CTBU Doctoral Foundation(1152005).References 1Xu S X,Ma G Y.Air-source heat pump coupled with economized vapor injection scroll vacuum pump and ejector:Design and experimental research.Sci China Tech Sci,2010,53(3):782789 2Lee G H.Performance simulation of scroll vacuum pumps.Proceedings of the Institution of Mechanical Engineers,2002,216:169179 3Chen J,Wang,L C,Li S L.Study and profound analysis on general profile theory of scrolls(in Chinese).Chinese J Mech Eng,2006,42(5):1115 4Wang L C,Chen J,Li S L,et al.Conjugate meshing theory of scroll profiles based on functional expression.Chinese J Mech Eng,2007,43(3):5053 5Gagne D P,Nieter J J.Simulating scroll vacuum pump using a generalized conjugate surface approach.Proceedings of the International Vacuum pump Engineering.Pudue,Purdue University,West Laffette,USA,1994,553558 6Christian G.The geometry of the scroll vacuum pump.Siam Rev,2001,43(1):113126 7Blunier B,Cirrincione G,Herv Y,et al.A new analytical and dynamical model of a scroll vacuum pump with experimental validation.Int J Refrig,2009,32(5):874891 8Zheng X Q,Zhang Y J,Yang M Y.Research and development on transonic vacuum pump of high pressure ratio turbocharger for vehicle internal combustion engines.Author brief introduction:Wang Licun,male,born in 1978,Ph.D.,Professor,College of mechanical engineering,Chongqing Technology and Business University.His main research interest:Mechanical design and theory.Published more than 40 papers and more than 30 papers indexed by SCI/EI,3 invention patents.Sci China Tech Sci,2010,53(3):18171824