CN207960719U - A kind of magnetorheological muffler of car combustion engine with piezo-electric generating function - Google Patents

Abstract

The utility model is related to automobile silencing technologies, and in particular to a kind of magnetorheological muffler of car combustion engine with piezo-electric generating function.Cylinder includes shell and fixed body, and several cylindrical holes are provided on fixed body, and being equipped with magnetic in cylindrical hole bores；The conical magnetorheological fluid that magnetic cone is covered in by cylindrical permanent magnet and after being magnetized on permanent magnet forms；Cylinder is divided into the first cavity, the second cavity and third cavity along vertical tubular axis direction by left clapboard and right clapboard in cylinder, generator unit is installed in the shaft in the second cavity；Fan blade is installed in shaft in first cavity；Piezoelectric stack is pressed on the bottom surface of hole by generator unit inner carrier by butterfly spring.Advantage and characteristic：Electric energy is converted wind energy into using piezoelectric effect to generate electricity, and not only absorbs noise, and can generate electricity, it is energy saving；The graded Active Absorption of acoustic impedance, acoustic frequency bandwidth are bored using magnetic.

Description

A kind of magnetorheological muffler of car combustion engine with piezo-electric generating function

Technical field

The utility model is related to automobile silencing technologies, and in particular to a kind of car combustion engine with piezo-electric generating function is used Magnetorheological muffler.

Background technology

With the promotion that people require quality of the life, requirement of the automobile to exhaust noise is also corresponding higher and higher. When the design and manufacture of car combustion engine muffler, sqouynd absorption lowering noise is means critically important in noise abatement.How to realize Good sound absorption noise reduction reaches best erasure effect and minimum power loss ratio, is always muffler for i. c. e design and system Make the research topic in field.There are many type of sound absorption material and structure, generally can be divided into single layer sound-absorbing material and multilayer is inhaled Sound material, they are all passively to absorb sound；And be different from the Active Absorption method passively to absorb sound be from noise transmission approach and by Sound body is controlled, its control targe is to make the reflectance factor very little of incident acoustic wave or close to zero, form " black hole " phenomenon, So that acoustic absorptivity reaches maximum, to achieve the purpose that sqouynd absorption lowering noise.Compared with traditional sqouynd absorption lowering noise technology, Active Absorption Technology can be such that acoustic absorptivity is changed according to the variation of outside noise, realize the active control of noise.

The intellectual material of Active Absorption mainly has piezoelectric material and magnetorheological fluid.Piezoelectric material mainly utilizes piezoelectric effect, According to the frequency of incident acoustic wave, charge is formed in piezoelectric material surface, acoustic energy is converted to electric energy, reaches the mesh of Active Absorption 's；Magnetorheological fluid has excellent controllability, causes micro-structure etc. easily to form gradient by the effect in magnetic field its viscosity, field and becomes Change, enables sound wave is unreflected to enter sound-absorbing material, and due to the viscosity and micro-structure of material itself, sound wave can be caused more Secondary reflection repeatedly absorbs, finally converts acoustic energy to thermal energy so that and sound wave can decay rapidly wherein, therefore, magnetorheological fluid Field causes micro-structure that can realize graded, is easily formed graded impedance, and a new visual angle is provided to actively intelligence sound absorption.

Invention content

For the problems of in terms of existing car combustion engine muffler noise reduction, the utility model proposes one kind having pressure The magnetorheological muffler of the car combustion engine of electric generating function, the embodiment that the utility model uses are：Including hollow cylinder Body, air inlet pipe is equipped with along the position of cylinder one end off-axis, and escape pipe is equipped with along the position of cylinder other end axis；Cylinder packet Shell and fixed body are included, several cylindrical holes are provided on fixed body, being equipped with magnetic in cylindrical hole bores；Magnetic cone by cylindrical permanent magnet and by The conical magnetorheological fluid composition being covered in after magnetization on permanent magnet；By left clapboard and right clapboard along vertical tubular axis in cylinder Cylinder is divided into the first cavity, the second cavity and third cavity by direction, and air inlet pipe is communicated with the first cavity, escape pipe and third Cavity communicates；Left recirculation hole and right recirculation hole are provided on left clapboard and right clapboard in uniform way；It is equipped in second cavity same with cylinder The shaft of axis, shaft both ends are mounted on left clapboard and right clapboard by rolling bearing, are set in left clapboard and right clapboard both ends of the surface There is the end cap of sealing bearing, generator unit is installed in the shaft in the second cavity；Shaft left end is extend into the first cavity simultaneously Fan blade is equipped with by screw in uniform way on the shaft shoulder of thin axis, fan blade by piezoelectric chip and metal substrate bonding and At；Cavity is set in generator unit, left portion of the shaft in cavity is laid with radially projecting left raised line, and shaft is in cavity Interior middle right part is laid with radially projecting right raised line, and left raised line and right raised line are staggered along shaft outer circle, left raised line It is consistent with right raised line cross section, it is all semicircle；Generator unit includes the left pole being disposed in parallel between left clapboard and right clapboard With right pole, piezoelectric stack, butterfly spring, left piston, right piston；Left pole and right extremely circular ring shape, left clapboard, Zuo Ji, right pole and Right clapboard is fixed as one；It is left extremely on be provided at least one cylindrical left hole, be equipped in each left hole and connect with left raised line in shaft Piezoelectric stack is pressed on left hole bottom surface by tactile left piston, left piston by butterfly spring；It is right extremely on be provided with and left hole quantity phase Deng cylindrical right hole, right piston contact with shaft upper right raised line is equipped in each right hole, right piston passes through butterfly spring general Piezoelectric stack is pressed on right hole bottom surface.

In the utility model, for the absorbing sound and lowering noise ability of raising fan blade, the shaft shoulder of the thin axis of fan blade and shaft It is connected by screw, and with axial direction at certain angle of inclination beta (similar blade of electric fan inclination angle), fan blade inclination angle is β =110 °, fan blade is the iridescent type structure of bending, and the radius of curvature of piezoelectric chip is less than the radius of curvature of metal substrate, pressure Electric wafer thickness is the PZT4 of 0.15~0.3mm, and metal substrate is beryllium-bronze, and the ratio between the thickness of metal substrate and piezoelectric chip is 1~2.5, the absorbing sound and lowering noise ability of fan blade is stronger at this time.

When air-flow blows to fan blade into the first cavity, in air-flow the vibration of sound wave so that the stress suffered by piezoelectric chip is handed over Acoustic energy is converted into electric energy for the process for increasing and reducing；Meanwhile gas dynamic pressure power drive fan blade rotates, and drives shaft Rotation, shaft rotation will make left piston under the effect of left raised line, right piston is vibrated and driven in right raised line generation periodic reverse Piezoelectric stack dilatation, to which wind energy is converted to electric energy through mechanical energy；The electric energy that piezoelectric chip and piezoelectric stack are generated It all converts through wire transmission to energy and powers into automobile circuit with storage circuit.

Magnetic cone be to keep magnetorheological fluid conical by permanent magnet magnetization according to gradual transition principle, using acoustic impedance by Gradual change, from the tip to bottom that magnetic is bored, acoustic impedance is that the impedance of magnetorheological fluid is gradually transitioned into from the characteristic impedance of air, from And realize good impedance matching；Simultaneously because the field of magnetorheological fluid itself leads to sound wave multiple reflections to microstructure characteristic, It repeatedly absorbs, finally converts acoustic energy to thermal energy, to make magnetic cone acoustic absorptivity in muffler reach highest.

Advantage and characteristic：1) it converts wind energy into electric energy using piezoelectric effect to generate electricity, not only absorbs noise, and can generate electricity, It is energy saving；2) the graded Active Absorption of magnetic cone acoustic impedance, acoustic frequency bandwidth are utilized.

Description of the drawings

Fig. 1 is a kind of car combustion engine magnetic current with piezo-electric generating function in one preferred embodiment of the utility model Become the structural schematic diagram of muffler；

Fig. 2 is the A-A sectional views of Fig. 1；

Fig. 3 is fan blade and rotating shaft assembling structure schematic diagram in one preferred embodiment of the utility model；

Fig. 4 is the partial enlarged view of Fig. 1.

Specific implementation mode

A kind of magnetorheological muffler of car combustion engine with piezo-electric generating function, including hollow cylinder V, along cylinder The position of the one end V off-axis is equipped with air inlet pipe a, and escape pipe p is equipped with along the position of cylinder V other end axis；Cylinder V includes shell Several cylindrical holes are provided on body b and fixed body c, fixed body c, being equipped with magnetic in cylindrical hole bores X；Magnetic bore X by cylindrical permanent magnet d and The conical magnetorheological fluid h compositions being covered in after being magnetized on permanent magnet d；By left clapboard g and right clapboard m along vertical in cylinder V Cylinder V is divided into the first cavity A, the second cavity B and third cavity C, air inlet pipe a and the first cavity A phases by cylinder V axis directions Logical, escape pipe p is communicated with third cavity C；Left recirculation hole g1 and right recirculation hole m1 are provided on left clapboard g and right clapboard m in uniform way； The shaft t coaxial with cylinder V is equipped in second cavity B, the both ends shaft t are mounted on left clapboard g and right clapboard m by rolling bearing On, left clapboard g and right clapboard m both ends of the surface are equipped with the end cap for sealing bearing, and power generation is equipped on the shaft t in the second cavity B Unit Y；Shaft t left ends extend into the first cavity A and are equipped with fan leaf in uniform way by screw on the shaft shoulder of thin axis t1 Piece E, fan blade E are bonded by piezoelectric chip e1 and metal substrate e2；Cavity D is set in generator unit Y, shaft t is in cavity D Interior left portion is laid with radially projecting left raised line t2, and middle right parts of the shaft t in cavity D is laid with radially convex The right raised line t3 gone out, left raised line t2 and right raised line t3 are staggered along shaft t outer circles, left raised line t2 and the cross sections right raised line t3 one It causes, is all semicircle；Generator unit Y includes the left pole f being disposed in parallel between left clapboard g and right clapboard m and right pole n, piezoelectricity Stack j, butterfly spring s, left piston i, right piston k；Left pole f and right pole n is circular ring shape, left clapboard g, left pole f, right pole n and the right side Partition board m is fixed as one；It is provided on left pole f at least one cylindrical left hole f1, each left hole f1 equipped with convex with a left side on shaft t Piezoelectric stack j is pressed on the bottom surfaces left hole f1 by the left piston i of t2 contact, left piston i by butterfly spring s；It is provided on right pole n The right piston contacted with the upper right raised line t3 of shaft t is equipped in the cylindrical right hole n1 equal with left hole f1 quantity, each right hole n1 Piezoelectric stack j is pressed on the bottom surfaces right hole n1 by k, right piston k by butterfly spring s.

In the utility model, to improve the absorbing sound and lowering noise ability of fan blade E, the thin axis t1's of fan blade E and shaft t The shaft shoulder is connected by screw, and with axial direction at certain angle of inclination beta (similar blade of electric fan inclination angle), fan blade E is tilted Angle is β=110 °, and fan blade E is the iridescent type structure of bending, and the radius of curvature of piezoelectric chip e1 is less than metal substrate e2's Radius of curvature, piezoelectric chip e1 thickness are the PZT4 of 0.15~0.3mm, and metal substrate e2 is beryllium-bronze, metal substrate e2 and pressure The ratio between thickness of electric chip e1 is 1~2.5, and the absorbing sound and lowering noise ability of fan blade is stronger at this time.

When air-flow blows to fan blade E into the first cavity, in air-flow the vibration of sound wave make answering suffered by piezoelectric chip e1 Acoustic energy is converted into electric energy by the process that power alternately increases and reduces；Meanwhile the E rotations of gas dynamic pressure power drive fan blade, band The t rotations of turn axis, shaft t rotations will make left piston i under left raised line t2 effects, right piston k is generated periodically in right raised line t3 It is of reciprocating vibration and drive piezoelectric stack j dilatations, to which wind energy is converted to electric energy through mechanical energy；Piezoelectric chip e1 and piezoelectricity Electric energy that j is generated is stacked all through wire transmission to energy conversion and storage circuit.

Magnetic cone X is to keep magnetorheological fluid h conical by permanent magnet d magnetization according to gradual transition principle, utilize acoustic impedance It gradually changes, the tip to bottom of X is bored from magnetic, acoustic impedance is gradually to be transitioned into the resistance of magnetorheological fluid h from the characteristic impedance of air It is anti-, to realize good impedance matching；Simultaneously because the field of magnetorheological fluid h itself causes sound wave more to microstructure characteristic Secondary reflection repeatedly absorbs, finally converts acoustic energy to thermal energy, to make magnetic cone X acoustic absorptivities in muffler reach highest.

Claims (1)

1. a kind of magnetorheological muffler of car combustion engine with piezo-electric generating function, it is characterised in that：Including hollow cylinder Body, air inlet pipe is equipped with along the position of cylinder one end off-axis, and escape pipe is equipped with along the position of cylinder other end axis；Cylinder packet Shell and fixed body are included, several cylindrical holes are provided on fixed body, being equipped with magnetic in cylindrical hole bores；Magnetic cone by cylindrical permanent magnet and by The conical magnetorheological fluid composition being covered in after magnetization on permanent magnet；By left clapboard and right clapboard along vertical tubular axis in cylinder Cylinder is divided into the first cavity, the second cavity and third cavity by direction, and air inlet pipe is communicated with the first cavity, escape pipe and third Cavity communicates；Left recirculation hole and right recirculation hole are provided on left clapboard and right clapboard in uniform way；It is equipped in second cavity same with cylinder The shaft of axis, shaft both ends are mounted on left clapboard and right clapboard by rolling bearing, are set in left clapboard and right clapboard both ends of the surface There is the end cap of sealing bearing, generator unit is installed in the shaft in the second cavity；Shaft left end is extend into the first cavity simultaneously Fan blade is equipped with by screw in uniform way on the shaft shoulder of thin axis, fan blade by piezoelectric chip and metal substrate bonding and At；Cavity is set in generator unit, left portion of the shaft in cavity is laid with radially projecting left raised line, and shaft is in cavity Interior middle right part is laid with radially projecting right raised line, and left raised line and right raised line are staggered along shaft outer circle, left raised line It is consistent with right raised line cross section, it is all semicircle；Generator unit includes the left pole being disposed in parallel between left clapboard and right clapboard With right pole, piezoelectric stack, butterfly spring, left piston, right piston；Left pole and right extremely circular ring shape, left clapboard, Zuo Ji, right pole and Right clapboard is fixed as one；It is left extremely on be provided at least one cylindrical left hole, be equipped in each left hole and connect with left raised line in shaft Piezoelectric stack is pressed on left hole bottom surface by tactile left piston, left piston by butterfly spring；It is right extremely on be provided with and left hole quantity phase Deng cylindrical right hole, right piston contact with shaft upper right raised line is equipped in each right hole, right piston passes through butterfly spring general Piezoelectric stack is pressed on right hole bottom surface.