CN110410203A

CN110410203A - A kind of engine of further noise reduction

Info

Publication number: CN110410203A
Application number: CN201910637960.1A
Authority: CN
Inventors: 叶晓波; 其他发明人请求不公开姓名
Original assignee: Ningbo Daye Garden Equipment Co Ltd
Current assignee: Ningbo Daye Garden Equipment Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2019-11-05

Abstract

A kind of engine of further noise reduction is additionally provided with strainer i.e. sieve and scavenging oral area trimmer valve in scavenging beneath galleries, and double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed be set as per minute 6300 switch to it is good；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately have strainer (58) be located under scavenging channel be 180 mesh fie screen；A plurality of wire is equipped with emission reduction catalyst by strainer made of knitting device rolls up (59), platiniferous, rhodium, indium and rare earth element, has catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, but catalyst hush tube (69) are first passed through, then by function hush tube (54d), assist the tubule of hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f) noise reduction.

Description

A kind of engine of further noise reduction

Technical field

The present invention provides one kind and cuts off shrub for the places such as beside flower bed, garden, park and road, and flowers and trees shaping is cut Filling machine band grass-mowing machine, belongs to gardens machine field.With the innovative approach by being discharged indirectly after one meter five of catalase hush tube, to expand Purposes on brush cutter installs band additional and cuts pile and beats the grass four bifurcated of the moving head of wire and the disc cutterbar with inside and outside sawtooth and controlization device Nozzle, and convenient for the long grass pressing wheel of pressure grass soil moisture conservation and meadow decorative pattern, to form low emission LPG brush cutter.There is the burning of function wave Room and with the collocation that has the internal combustion engine ignition device of active receiving electrode and fine motion discharge electrode, have and add double auxiliary skirt rims in piston skirt It reduces hydrocarbon emission and piston skirt logarithmic differentiation isogonal line skirt turbulent flow returns and alters drop row, there is narrowed left and right block Double auxiliary blow vents reduce a variety of methods of discharge, the two-stroke LPG engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise It is the engine of low emission, is the crystallization that the present inventor's lifetime domestic and foreign experience is groped；Known two rush petrol engine discharge hardly possible It is up to standard, it is existing can be up to standard, had determined that in the application that two rush gasoline engine scavenging road junction and start batch to produce, imply 20 years from now on it is low Discharge LPG bis- rushes the developing direction of machine and brush cutter and grass-mowing machine, has started brush cutter two-stroke LPG engine and further The new technical field of the engine of noise reduction.

Background technique

Brush cutter is widely used in the places such as flower bed, garden, park and road side and cuts the grass on a lawn, tending ot young growth, tea Garden updates, and herbage harvesting is returned crop stocks to the field, flowers and trees shaping etc. cuts off the operation of shrub branch；It is selected by the hobby of people Mode carrys out brush.Some operation pedestrians like and when habit brush cutter, when especially encountering corner place, use energetically Press mobile jib, do mobile jib often position and does not live and micro wave calmly.The height for operating pedestrian is different, and habit takes work The difference for making angle, needs mobile jib adjustable length, and the round type linkage of original positioning mobile jib, causes mobile jib micro there are easy The shortcoming rocked.The low vibration and low noise of low vibration grass-mowing machine, if considering to have in the foamed plastics of stock plus-minus vibration Certain curative effect；And the very big root of vibration and noise is not only in the precision and geometric tolerance of power and tool, and is mechanism, The harmony of catalyst, hush tube, vibration-damped handle, cutter and engine cooperates, and low vibration and the low emission for pursuing grass-mowing machine are true On be the hard nut to crack left for a long time.Power per liter can be improved relative to four-stroke engine using two stroke engine 50% or more, but be that true hardly possible is up to standard in discharge, this is a part of project of the invention；Grass-mowing machine is portable dam, it is desirable to Power is light and small；No matter two-stroke or four-stroke gasoline engine will igniter, engine spark plug is widely used in arteries and veins Current voltage of leaping high is introduced into combustion chamber, makes the gaseous mixture sparking of inspiration cylinder and lights, and then diffusion combustion and breaks out work done. Between the external connector of existing spark plug and the spark cap for having rubber jar, has sometimes and loosely dissipate scattered phenomenon.Existing fire The inside of Hua Sai, though being equipped with glass-sealing agent makees resistance, only impedance；If adding induction reactance and capacitive reactance, forms suitable RCL and return Road, there will be the effects for more preferably inhibiting radio interference.Multiple tracks umbrella rib on insulator can also be improved by semi-circular cross-section For saw-tooth shaped cross section, climbs electric channel more to insulate and preferably block rubber jar.The metal shell of existing spark plug Heat dissipation also can further improve.The electrode of existing spark plug, as one can imagine, there are easy coking, easy ablation, single-point arcing, low temperature The shortcomings that difficult point；If electrode innovation be it is movable, when there is improvement.It is but not perfect moreover there are many original combustion chambers Ten beauty；In addition to crossing advantage, there is shortcoming；Such as wedge-section combustion chamber, gaseous mixture undue concentration at spark plug, operating condition Seem rough；For another example bathtub shaped combustion chamber, the shape of prolate, making squish, the effect is relatively poor, flame travel Longer, burn rate is relatively low, and burning time is long, and rate of explosion is low, and surface to volume ratio F/V is larger, is unfavorable to HC discharge. For another example bowl-in-piston chamber, hemispherical combustion chamber, fluffy shape combustion chamber and other types combustion chamber such as generate the auxiliary combustion of turbulent flow Room, dual ignition plug combustion chamber, the combustion chamber of plane is each has something to recommend him；But the invention that the mankind aspire after perfection is endless, piston Also there are very big potentiality that can dig.The so-called best geometry of combustion chamber and piston is no doubt important, but to be adapted to engine model And arrange in pairs or groups with igniter, just there is preferable effect.Especially fuel economy of the two-stroke gasoline engine than four-stroke gasoline engine It is worse, the hydrocarbon emission Chang Chaobiao in tail gas.Combustion chambers of internal combustion engines and piston and collocation with igniter, are one It is related to the hard nut to crack of energy-saving and emission-reduction.It contributes if with four-stroke engine less；Volume is big if with booster；If using bavin Then easy soiled is personal for oil turbine；By the exhaust gas of the engine direct emission by person of modern times, hover in engine environment, portion It can be sucked by engine air filter and carburetor air mouth, and portion can be sucked by people.Brush cutter can only brush and cannot It beats the grass；It can dual-use if installing moving head additional on cutter head；The meadow just beaten, some grass have the phenomenon for being pulled out pine, if With grass pressing wheel, not only there is the soil moisture conservation of pressure grass and extrude the effect of meadow decorative pattern, and makes smooth operation and laborsaving；Common flat sword Bush knife encounters stiff wood bar and just allows knife phenomenon sometimes, if with band part sawtooth since the effect of sliding cutting is more than the effect of impact cutting Knife can improve；It is long to cut pile wire service life of beating the grass；If can be advanced optimized with the improvement of four bifurcated nozzle of carburetor into vapour； And known two rush petrol engine discharge it is difficult it is up to standard after, if being used in piston skirt adds double auxiliary skirt rims and disorderly in scavenging road junction inclined wedge It flows back to and alters the low emission two of piece and rush the engine sheet that petrol engine is changed to a kind of further noise reduction, make when can further improve Brush cutter and grass-mowing machine are up to standard.

Summary of the invention

In order to make up shortcoming caused by the existing mechanism of grass-mowing machine, keep mobile jib positioning reliable and it is not micro wave, make brush The low vibration and low noise of machine are improved, and power output and cutting effect are improved, and lower discharge, and the present inventor has done many brush The improvement of machine grass-mowing machine, with containing the single-cylinder air-cooled petrol engine of small two-stroke for improving more scavenging ports, such as E134F is former long Bar is changed to the hush tube of more honeycombs and catalyst, there is transparent shield, has the bush knife of periphery blade and inner circumferential blade, there is side The steady stock interface of flange and lateral filament button, there is the hand handle of spiral spring or wave spring and vibration damping, there is inside spin whirlpool nozzle Carburetor, formed it is novel there is catalase hush tube and swirl sprayer and two to rush the brush cutter of more scavenging port gasoline engines, be a kind of Low-emission gasoline brush cutter.Brush cutter can only brush and cannot beat the grass；It can dual-use if installing moving head additional on cutter head； The meadow just beaten, some grass have the phenomenon for being pulled out pine, if not only having the soil moisture conservation of pressure grass with grass pressing wheel and extruding the effect of meadow decorative pattern Fruit, and make smooth operation and laborsaving；The bush knife of common flat sword is encountered since the effect of sliding cutting is more than the effect of impact cutting Stiff wood bar just allows knife phenomenon sometimes, if can be improved with the knife of band part sawtooth；It is long to cut pile wire service life of beating the grass；If with changing The improvement of oily four bifurcated nozzle of device can be advanced optimized into vapour；And known two to rush petrol engine discharge difficult up to standard, finds use on Piston skirt, which adds double auxiliary skirt rims and returns in scavenging road junction inclined wedge turbulent flow, alters the low emission two of piece and rushes petrol engine, when can be into one Step improves and keeps brush cutter and grass-mowing machine up to standard.Therefore to expand purposes, on the basis of Low-emission gasoline brush cutter, installation is beaten the grass Head, grass pressing wheel, band serrated knife cut pile and beat the grass the improvement of four bifurcated nozzle of wire and carburetor, form Low-emission gasoline and cut Filling machine.The engine of low emission, be the improvement of internal combustion engine the combustion chamber for having function wave and with have active receiving electrode and fine motion On the basis of the collocation of the internal combustion engine ignition device of discharge electrode, and adds double auxiliary skirt rims to reduce hydrocarbon in piston skirt and arrange On the basis of the petrol engine put, and the vapour for altering drop row is returned in improved piston skirt logarithmic differentiation isogonal line skirt turbulent flow On the basis of oil turbine, double auxiliary blow vents of further improved narrowed left and right block reduce the two of discharge and rush petrol engine, Belong to the combustion chamber of internal combustion engine and the technical field of turbulent scavenging.In piston skirt plus double auxiliary skirt rims and in scavenging road junction inclined wedge Petrol engine is rushed in the low emission two that turbulent flow time alters piece, is the crystallization for collecting many years domestic and foreign experience and groping；Its usefulness is to take Unexpected emission reduction effect up to standard was obtained, and brush grass-mowing machine is dual-purpose.

Silkworm in spring not to the utmost, improves invention and has no limits to dead silk；It wears out iron shoes and on a rare occasion obtains, clino-diagonal is warded off in energy-saving and emission-reduction.Everybody knows Two rush machine discharge Chang Chaobiao, but nobody can thoroughly solve；The scavenging road junction inclined wedge turbulent flow returns and alters piece, is sweeping in two qi of chong channel ascending adversely cylinders Gas port adds small pieces, seems simple, but nobody can find out；It is one small to be who fails to give attention to go to burn-on at the scavenging road junction of cylinder Piece, which is loaded on, starts the engine and contacts with high speed piston, but the sudden caprice for often having an examination in arms just has amazing effect, What this, this is not invented exactly this be both after travelling far and wide in search of it, thousand consider and it is even have one, and be for many years to grope and state The crystallization of inside and outside experience has received emission reduction effect up to standard really.Moreover the carburetor of engine has the potential to be tapped very much, if four points Fork nozzle refers to that on the outlet of the nozzle of the inside of carburetor be four bifurcated nozzles along 4 gaps are set ring week, therefore improves Mixing combustion fluid state of the vapour through gap and be conducive to atomization.Although spark-ignition process and two rushing detailed physical and chemical processes very Complexity, the mankind are still not clear there are many aspect so far, but we perhaps can be initially believed that, this scavenging road junction inclined wedge turbulent flow It returns and alters piece, generate turbulent flow with inclined wedge at scavenging road junction, returning a possibility that channeling to gas handling system to exhaust gases after combustion has retardance Effect, doubtful to belong to turbulent ventilation, well known cross flow scavenging, loop scavenging and uniflow scavenging three for two-stroke internal combustion engine For kind ventilation scheme, open an energy emission reduction alters the approach of piece in scavenging road junction inclined wedge turbulent flow time, referred to as turbulent The clino-diagonal of scavenging or the shortcut of low emission.Although the mechanism of its atom level needs the following exploration, it rushes gasoline engine scavenging two The application at road junction has determined that and starts batch production, represents the developing direction of 20 years Low-emission gasoline brush cutters from now on.Pile is cut to beat Careless wire is more durable than nylon wire mostly, is not only conducive to long-acting cutting, few with line, saves into disk nylon wire；And can beat the grass, also Straw can be cut and nylon wire cuts motionless thin bar；Beat the grass wire when cutting different objects and disc cutterbar complement each other it is each has something to recommend him. And the long diameter of beating the grass that is equal to of its roller of long grass pressing wheel then can just be pressed onto the grass just cut, to press careless effect obvious.With thin Long grass pressing wheel, in order to press careless soil moisture conservation, material-saving rolls covering face height, and meadow embossing is beautiful.

The present invention solves the technical solution that its technical problem is taken and method is:

The filtering scavenging gasoline brush cutter is low using the two-cycle gasoline engine for adding strainer in scavenging channel The engine of discharge, be near piston top dead center, in cylinder before the ignition of mixed gas of compressed piston upper, by Moved up in piston train of dress portion and open the preparation air entry in latch-release cylinder, in the crankcase below piston suck fuel and The gaseous mixture of air；The pressure of the burning gases of the piston upper generated again due to igniting, piston is from top dead-centre to bottom dead centre side To movement and air entry is simultaneously closed off, the gaseous mixture in compression crankcase is vented in the piston upper of bottom dead center-nearby from opening and closing While the burning gases in cylinder are discharged to outdoor gas in mouth, the scavenging access being connected by crankcase with cylinder, In Gaseous mixture is imported into the two cycle engine in cylinder from crankcase by preparation scavenging port in piston upper latch-release cylinder；The design There is the valve gear with crankshaft-synchronous, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging access configures At normally closed；When the valve-closing of the crankcase side of scavenging access, gaseous mixture in scavenging access by combustion gas fire Flame is allowed to burning of igniting, and after HC reduction again from crankcase to scavenging port, the crankcase side of scavenging access is allowed to be open, and is sweeping While the burning of gas access is sent out with gaseous mixture, the gaseous mixture in crankcase closes exhaust before being discharged from exhaust outlet Mouthful, here it is the two cycle engines for substantially reducing the discharge of HC；Strainer (58) in the scavenging channel is located at technique Beside butt strip (55), or it is located under scavenging channel；The strainer in the scavenging channel be by a plurality of wire through knitting device and At to breathing has filtering regulating and controlling effect between gas and crankcase in cylinder；It is equipped with multiple wedges (11b) that noise control strainer is equipped with, institute Stating wedge is multiple hollow six prismatics, has aperture, the advanced wedge compression of air-flow on top, then escape and expand from wedge aperture, has and disappear Sound effect；Be equipped with catalyst volume (59) again, platiniferous rhodium indium iridium has a catalyst effect to gas is flowed through, it is ingenious slow down pneumatic noise and The discharge of HC.

The two-stroke LPG engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, is used for brush cutter, containing stock, cuts Cutter, manipulating handgrip assembly, the stock contain aluminum pipe, are equipped with transmission shaft, institute in the cavity being equipped with inside the aluminum pipe It states aluminum pipe and transmission shaft the upper end and is installed with the cutting equipped with engine i.e. engine, the aluminum pipe and its lower end of transmission shaft Device is installed with hand handle in the middle part of the aluminum pipe；The brush cutter its contain the two-cycle gasoline engine, that is, engine (1), interior six Angle fillister head screw M6x30 (2), hexagon socket cap head screw M5x8 (3), 31 type hex nut M6 (4), PP wire clamp (5), PA Hanging ring (6), 41 type non-metallic insert hexagonal locking nut M5 (7), POM hanging ring fixing seat (8), hexagon socket cap head screw M5x20 (9), it is preceding connect aluminum pipe (10), manipulating handgrip assembly (11), control handle pipe (12), 13 band spring washers in hexagonal cylindrical head Screw M5x25 (13), hand handle fixing seat upper clamp plate (14), hand handle fixing seat (15), left handgrip component (16), nitrile rubber hand handle Shock-absorbing sleeve (17), hand handle fixing seat lower clamp plate (18), left handgrip pipe (19), five leaf nylon tubes(20), transmission shaft(21), deep groove ball bearing III (22), spring washer 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking knob (26), shaft adapter (27), rear aluminum pipe(28), 4 hexagon socket cap head screws M5x12 (29), 4 spring washers 5 (30), limit handle spring (31), limit handle lock (32), limit handle (33), opening Retaining ring 2.5 (34), shield fixing seat (35), circlip for hole 26 (36), circlip for shaft 10 (37), roundlet gear with curved teeth (38), small arc-shaped gear oil block up (39), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), Plain washer 6 (42), gear-box (43), great circle gear with curved teeth (44), splined shaft (45), deep groove ball bearing 6002I (46), hole elasticity Retaining ring 32 (47), gear-box shield (48), spline pad (49), disc cutterbar contain 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or 4 Tooth disc cutterbar (64) or 8 tooth disc cutterbars (65), cutterhead pressing plate (51), cutterhead shield (52), 1 type hex nut M10 left-handed (53), Or nylon moving head (54), harness (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross slotted disk Head tapping screw ST4x14 (59), shield A (60), shielding support (61), hexagon socket cap head screw M5x35 (62), a left side Hand handle (16-1), 1 type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4), the waistband (66) for having pallet (67), auxiliary turn ball (68), catalyst hush tube (69)；The gasoline engine (1), with 1E39F, single cylinder and 39 cylinder diameters and air-cooled, assembly containing starter (F1), starting driver plate component (F2), 2 oil sealings (F3), right case (F4), 2 deep groove ball bearing II (F5), hexagonal cylindrical head plain cushion screw assemblies M5 in 2 torque 7-9NM × 45 (F6), the muffler ASSY (F7) of hush tube containing catalyst (69), silencer pad (F8), the right shock-reducing sleeve of fuel tank (F9), 2 pistons Sell retaining ring (F10), piston pin (F11), needle bearing (F12), piston (F13), piston ring (F14), crank assemblby (F15), half Round key (F16), cylinder block pad (F17), cylinder block (F18), 2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19), engines Outer cover (F20), recessed pan head tapping screw ST5 × 14 (F21), igniter assembly (F22), 2 crosses fluting screw assemblies M4 × 20 (F23), spark plug (F24), without asbestos packing sheet mould assembling pad (F25), 2 mould assembling positioning pins (F26), left box body (F27), 5 Cross fluting screw assemblies M5 × 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch disk (F31), axis bullet Property retaining ring (F32), the left shock-absorbing sleeve L (F33) of fuel tank, the right shock-absorbing sleeve R (F34) of fuel tank, inserts bearing connection seat (F35), 3 crosses Slot screw assemblies M5 × 20 (F36), upper clamp plate shock-absorbing sleeve (F37), lower clamp plate shock-absorbing sleeve (F38), upper clamp plate (F39), lower folder Plate (F40), 2 interior hexagonal cylindrical head screw assemblies M5 × 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 skies Filter seat pad set (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 spring washers (F47), 2 ten Word fluting coiled hair bullet screw M5 × 63 (F48), air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50), 2 Air inlet pipe pad (F51), deflector (F52), polyphenylene sulfide PPS air inlet pipe (F53), grounding wire component (F54), without asbestos packing sheet Oily device pad (F55), carburetor assembly (F56), PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil resistant butadiene-acrylonitrile Rubber oil tube socket (F59), fuel filter assembly (F60), oil pipe clip (F61), HDPE are blow molded fuel tank (F62), cap assembly of fuel tank (F63), 5-7NM hexagon-headed bolt plain cushion combination M6X14 (F64), 4 3-5NM cross flutings screw assemblies M5X18 (F65), Its two-cycle gasoline engine for being included of the brush cutter, passes through the hexagon socket cap head screw M6x30 (2), interior six Angle fillister head screw M5x8 (3) and 31 type hex nut M6 (4), with it is described before connect aluminum pipe (10) and be connected；Before described The outside for connecing the pipe of aluminum pipe (10), by the PP wire clamp (5), PA hanging ring (6), 41 type non-metallic insert hexagonal locking nuts M5 (7), POM hanging ring fixing seat (8), hexagon socket cap head screw M5x20 (9) simultaneously form harness portion with harness (55), so as to Harness is worn in single shoulder；It is connect on aluminum pipe (10) before described, is installed with manipulating handgrip assembly (11), be by control hand handle Manage (12), more bands spring washer hexagon socket cap head screw M5x25 (13), hand handle fixing seat upper clamp plate (14), hand handle fixing seat (15), left handgrip component (16), nitrile rubber hand handle shock-absorbing sleeve (17), hand handle fixing seat lower clamp plate (18), left handgrip pipe (19) It is collectively constituted；The inside that the pipe of aluminum pipe (10) is connect before described is installed with the five leaf nylon tubes (20), transmission shaft(21) and deep groove ball bearing III (22) is to be driven；Aluminum pipe (10) are connect before described described in Spring washer 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking knob (26), shaft adapter (27), it is connect with the rear aluminum pipe (28), and passes through 4 hexagon socket cap head screw M5x12 (29), 4 spring washers 5 (30), limit handle spring (31), limit handle lock (32), limit handle (33), split washer 2.5 (34) and form limit hand Handle component；In the end of the rear aluminum pipe (28), it is installed with the shield fixing seat (35), circlip for hole 26 (36), circlip for shaft 10 (37), roundlet gear with curved teeth (38), small arc-shaped gear oil block up hexagonal in (39) and more band spring washers Fillister head screw M5x25 (13), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), plain cushion Enclose 6 (42) and gear-box (43), great circle gear with curved teeth (44), splined shaft (45), deep groove ball bearing 6002 (46), hole elasticity gear Enclose 32 (47), gear-box shield (48), spline pad (49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead shield (52)；Institute The cutter stated contains shield and moving head and disc cutterbar to select；It is left with the 1 type hex nut M10 to fill cutterhead It revolves (53)；Or dress nylon moving head (54) to be to replace disc cutterbar, and cutting is beaten the grass the small blade (57) of line, passes through Hexagon nut with flange M5 (56), knife rest (58), cross recessed pan head tapping screw ST4x14 (59) are mounted in the shield A (60) on, and shielding support (61) and hexagon socket cap head screw M5x35 (62) to be installed；Cutterhead can multiselect or 2 tooth cutteves Disk (63) or 4 tooth disc cutterbars (64) or 8 tooth disc cutterbars (65), to select the shrub for cutting different cultivars；The left handgrip group Part (16), by left handgrip (16-1), 1 type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), cross recess Pan head screw M5x30 (16-4) is formed, and is mounted on left handgrip pipe (19)；And have the waistband (66) of pallet (67), it can tie up to People's waist, pallet (67) and auxiliary turn ball (68) movable contact, and auxiliary turns ball (68) and connect with engine enclosure (F20), so as to Further lengthen cut coverage；Catalyst hush tube (69), connect muffler ASSY (F7) gas outlet, so as to exhaust gas through aluminum pipe and It is discharged near cutter；The engine start part of the two-stroke LPG engine includes starter assembly (F1), starting driver plate Component (F2) is furnished with 2 oil sealings (F3) and 2 deep groove ball bearing II (F5), to be rotationally mounted in the right side of engine On cabinet (F4)；By hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6) in 2 torque 7-9NM, hush tube containing catalyst (69) muffler ASSY (F7) and silencer pad (F8), are fixed on cylinder block (F18)；It is equipped on cylinder block (F18) The right shock-reducing sleeve of fuel tank (F9)；2 retaining ring for piston pins (F10), piston pin (F11), needle bearing are provided in cylinder block (F18) (F12), piston (F13), piston ring (F14) and crank assemblby (F15) set woodruff key (F16) on crankshaft；Cylinder block pad (F17) It is mounted on cylinder block (F18)；2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19) and recessed pan head tapping screw ST5 × 14 (F21) engine enclosure (F20) is fixed on cylinder block (F18)；Igniter assembly (F22) passes through 2 cross fluting combinations Screw M4 × 20 (F23) are fixed；Spark plug (F24) is also on cylinder block (F18)；No asbestos rubber is put on cylinder block (F18) Offset plate mould assembling pad (F25), 2 mould assembling positioning pins (F26), and left case is fixed with 5 cross flutings screw assemblies M5 × 25 (F28) Body (F27)；Magnetic flywheel (F29) on the crankshaft, and with clutch assembly (F30), clutch disk (F31) and circlip for shaft (F32) it matches；The left shock-absorbing sleeve L (F33) of fuel tank and the right shock-absorbing sleeve R (F34) of fuel tank are on the outer cover (20)；Inserts Bearing connection seat (F35) is fixed by 3 cross flutings screw assemblies M5 × 20 (F36)；On the connection seat (F35) Equipped with upper clamp plate shock-absorbing sleeve (F37), lower clamp plate shock-absorbing sleeve (F38) and upper clamp plate (F39) lower clamp plate (F40) and in 2 Hexagonal cylindrical head screw assemblies M5 × 18 (F41) clamp；Flame-out wire clamp (F42) is also equipped on the connection seat (F35)； Air filter seat (F43), 2 air filter seat pad sets (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46) are logical Cross 2 M5 spring washers (F47) and 2 cross flutings coiled hair bullet screw M5 × 63 (F48) air filter lid (F49), cross fluting coiled hair Screw assemblies M5 × 14 (F50) form air filter, and are packed on carburetor；2 air inlet pipe pads (F51), deflector (F52), Polyphenylene sulfide PPS air inlet pipe (F53), grounding wire component (F54), without asbestos packing sheet carburetor packing (F55), carburetor assembly (F56) carburetor is formed；PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter assembly (F60), oil pipe clip (F61), HDPE blow molding fuel tank (F62), cap assembly of fuel tank (F63) composition oil Case；And 5-7NM hexagon-headed bolt plain cushion combination M6X14 (F64) is the fixed starting driver plate component (F2), as 4 3-5NM cross fluting screw assemblies M5X18 (F65) is that the fixed starter assembly (F1) is used；Described has support The waistband (66) of disk (67) is equipped with pallet (67), can place auxiliary on pallet (67) and turn ball (68), and assists turning ball (68) dress In external engine, or brush cutter engine is directly placed on the pallet (67) that waistband (66) is equipped with and is come up operation；Pallet (67) turn ball (68) movable contact with auxiliary, auxiliary turns ball (68) and connect with engine enclosure (F20), cuts further to lengthen Cut range；Catalyst hush tube (69), one end connect the gas outlet of muffler ASSY (F7), connect aluminum pipe before another termination, so as to Exhaust gas aluminum pipe after described, and be discharged near cutter；The catalyst hush tube (69) is aluminum, have exhaust gas by so as to There is aluminium dioxide catalyst effect；The muffler ASSY (F7) is aluminum, has exhaust gas by just there is aluminium dioxide catalyst effect It answers；Aluminum pipe (10) is connect before described and rear aluminum pipe (28) be it is separated, have exhaust gas by there is aluminium dioxide catalyst effect；In Five leaf nylon tubes after described in aluminum pipe set foam honeycomb body, and add catalyst catalyst in foam honeycomb body, to there is exhaust gas logical It is out-of-date to have catalyst multiple catalyzing effect；The 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) for select, It is commonly referred to as the disc cutterbar of cutter, multiple outer cutting edges (641) are equipped in cutterhead periphery, so that brush allows knife less；2 teeth Disc cutterbar (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) are equipped with multiple inner cutter holes (642) in cutterhead periphery, to cut Fill card branch in not；In the carburetor assembly (F56), the interior straight tube (70) for improving atomizer is to have helicla flute (71) Vortex spray bar, in favor of dissipating mixed effect；In the carburetor assembly (F56), the interior straight tube of atomizer is improved (70) or have helicla flute (71) vortex spray bar import be have parabolical horn mouth (72) or conical section such as Ah The horn mouth of base Mead curve, in favor of polymerizeing contaminated product effect；On the left handgrip pipe (19), it is equipped with close circle helical spring (19b) is taken in the damping of shape, so as to further damping；Using there is transparent or partially transparent shield (60), more with benefit Facilitate observation brush operation；The single-cylinder air-cooled equal pressure angle logatithmic spiral runner bilayer cooling of the small two-stroke that this brush cutter uses The two-stroke LPG engine of noise elimination, belongs to the engine of low emission, be the improvement of internal combustion engine the combustion chamber for having function wave and with On the basis of the collocation for having the internal combustion engine ignition device of active receiving electrode and fine motion discharge electrode, and in piston skirt add double auxiliary skirts On the basis of side reduces the petrol engine of hydrocarbon emission, and in improved piston skirt logarithmic differentiation isogonal line skirt Side turbulent flow returns on the basis of the petrol engine for altering drop row, and double auxiliary blow vents of further improved narrowed left and right block reduce discharge Two rush petrol engine；In piston skirt plus double auxiliary skirt rims, there is the effect that emission reduction is up to standard；Piston skirt logarithmic differentiation isogonal line It is to be equipped with double auxiliary skirt rims (g37) in the skirt section of piston (g31) that skirt turbulent flow, which returns and alters the petrol engine of drop row,；Described is double Auxiliary skirt (g37) is on the basis of retaining former two skirt of the bilateral for there be not connecting rod pin hole of original piston, and at piston (g31) Skirt section the bilateral for having connecting rod pin hole it is following, an auxiliary skirt is also added on every one side, becomes double auxiliary skirt rims (g37)；Institute The double auxiliary skirt rims stated, containing bottom edge (g38), lower fillet (g39), side (g40), upper fillet (g41), bottom edge concave arc side (g42), isogonal one section of the through-hole (g43) of the double auxiliary skirt rims of piston, piston skirt logarithmic differentiation equation is located at skirt, It is conducive to auxiliary guiding, and additional turbulence, which is returned, alters and drop row and lubrication assistant and heat dissipation；The double auxiliary skirt rims are closed with aluminium Gold, or with composite material to reduce cylinder prepareding gap；Each auxiliary skirt of the double auxiliary skirt rims (g37) and the original Two skirts are the extensions along the cylindrical body in outside piston week, and it is edge that its projection, which is thrown on the face vertical with piston motion direction, Outside piston week the quartering；Each auxiliary skirt of the double auxiliary skirt rims (g37) is than two skirt of original along piston The cylindrical body of excircle is extended longer, that is to say, that the bottom edge of former two skirts of bottom edge (g38) ratio of double auxiliary skirt rims is along piston Cylindrical body extended line direction on it is farther apart from connecting rod pin hole, i.e., double auxiliary skirt rims are higher, and piston and skirt section are longer, effect be Be conducive to the guiding length of lengthened piston and assist being oriented to；The two sides of the double auxiliary skirt rims (g37) are equipped with the side of double auxiliary skirt rims Side (g40) connects the bottom edge (g38) of piston (31) and double auxiliary skirt rims；The two sides of the double auxiliary skirt rims (g37), the company of being equipped with The side (g40) of the double auxiliary skirt rims on the bottom edge (g38) for plug (31) and the double auxiliary skirt rims of taking over a job, the angle of the side (g40) of two sides Greater than 100 degree；The two sides of the double auxiliary skirt rims (37) are equipped with the side (g40) of double auxiliary skirt rims, are by double auxiliary skirt rims The upper fillet (g41) of side connects piston (g31)；The two sides of the double auxiliary skirt rims (g37) are equipped with the side of double auxiliary skirt rims Side (g40) is the bottom edge (g38) that double auxiliary skirt rims are connected by the lower fillet (g39) of the side of double auxiliary skirt rims；Described Concave arc side (g42) is set on the bottom edge of double auxiliary skirt rims (g37)；The concave arc side (g42) or circular arc or involute, or Parabola assists drop row with benefit；Through-hole (g43) or pit are set in the double auxiliary skirt rims (g37), with sharp lubrication assistant and is dissipated Heat；In the double auxiliary skirt rims (g37) and piston be equipped with multiple through-holes (g43), be slightly in up-side down triangle arrangement, have it is multiple rows of, Most downlink through-hole is few, more more toward uplink through-hole, with sharp lubrication assistant and heat dissipation；Cylinder body (g44) is two to rush petrol engine Along the cylinder body (g44) at the symmetrically scavenging road junction (g45) containing left and right each one on the cylinder chamber of dress piston, described Cylinder body (g44) symmetrical left and right each one scavenging road junction (g45) on symmetrically each ground in left and right be equipped with inclined wedge turbulent flow return alter Piece (g46), using the equal feature of the logatithmic spiral tool pressure angle of higher mathematics, so that the inclined wedge turbulent flow time is altered piece has by right As soon as section of the logatithmic spiral of fractional differentiation equation, then the mixed air-flow gushed on it is easily steady, is utilized at scavenging road junction with benefit Pressure angle generates turbulent flow to block exhaust gas time and alter to reduce discharge；The inclined wedge turbulent flow returns and alters the scavenging that piece (g46) is located at cylinder body The side of the outlet of the scavenging air belt close to piston for closing on lower dead center of the bottom of the bottom at road junction (g45) has logarithm spiral shell One section of line；It includes that inclined wedge turbulent flow goes back to the scavenging road junction (g47) for altering piece, inclined wedge turbulent flow returns that the inclined wedge turbulent flow, which returns and alters piece (46), Alter the inclined wedge (g48) at the logical scavenging road junction of piece, inclined wedge turbulent flow returns returning for the logical scavenging road junction for altering piece and alters grid (g49), inclined wedge turbulent flow The turbulent shield (g50) for altering the logical scavenging road junction of piece is returned, has one section of logatithmic spiral；The inclined wedge turbulent flow returns and alters piece (g46) It is slightly in inclined wedge-shaped, the big end of the inclined wedge-shaped is connected under the closing on of the bottom of the bottom at the scavenging road junction (g45) of cylinder body The side of the outlet of the scavenging air belt close to piston of stop, one section of tool logatithmic spiral；The inclined wedge turbulent flow returns and alters piece (g46) the scavenging road junction (g47) that the inclined wedge turbulent flow for being included time alters piece is located at the inclined wedge turbulent flow and goes back to the top for altering piece (46), That is inclined wedge turbulent flow return the inclined wedge-shaped for altering piece (g46) small end its have one section of logatithmic spiral；The inclined wedge turbulent flow It returns to alter the inclined wedge turbulent flow that piece (g46) is included and return the inclined wedge (g48) at the logical scavenging road junction for altering piece and is located at inclined wedge turbulent flow and returns Alter the inside of piece (g46) and the bottom connection with the bottom at the scavenging road junction (g45) of cylinder body, its tool logarithm spiral shell of the inside One section of line；The inclined wedge turbulent flow, which returns, alters the logical scavenging road junction that the inclined wedge turbulent flow go back to that piece (g46) is included alters piece Return alter grid (g49) be located at inclined wedge turbulent flow return alter piece and cylinder body scavenging road junction (g45) scavenging air belt outlet side intersection Place, one section of tool logatithmic spiral；The inclined wedge turbulent flow time alters the inclined wedge turbulent flow time that piece (46) is included and alters piece The returning of logical scavenging road junction, which alters grid (g49) and be located at inclined wedge turbulent flow, goes back to the outlet for altering the scavenging air belt at scavenging road junction (g45) of piece and cylinder body Side chamfering at, tool one section of logatithmic spiral；The inclined wedge turbulent flow returns and alters the inclined wedge that piece (g46) is included Turbulent flow returns returning to alter grid (g49) and be located at inclined wedge turbulent flow and going back to the scavenging road junction (g45) for altering piece and cylinder body for the logical scavenging road junction for altering piece At the rounded corner of the side of the outlet of scavenging air belt, one section of tool logatithmic spiral；The inclined wedge turbulent flow returns and alters the upper of piece (g46) Face is equipped with inclined wedge turbulent flow and returns the turbulent shield (g50) for altering the logical scavenging road junction of piece, and one end alters piece and cylinder with inclined wedge turbulent flow time is located at It is connected at the chamfering of the side intersection of the outlet of the scavenging air belt at the scavenging road junction (g45) of body, and its other end and inclined wedge turbulent flow return That is small end that the inclined wedge-shaped for altering piece (g46) is returned with inclined wedge turbulent flow in the top for altering piece is connected；And the turbulent shield is upper Face its also have one section of logatithmic spiral；The double auxiliary blow vents for narrowing left and right block reduce the two of discharge and rush petrol engine, containing a left side Block, right block, piston and combustion chamber, spark plug, gray iron, cylinder barrel, connecting rod, crankcase, lubricating oil pump, lubricating system, Fuel system, ignition system, cooling system, the cylinder body (g44) are two cylinder chambers in dress piston for rushing petrol engine The cylinder body (44) at the upper edge symmetrically scavenging road junction (g45) containing left and right each one, in the symmetrical of the cylinder body (g44) Left and right each one scavenging road junction (g45) on, respectively symmetrically each ground in left and right be equipped with inclined wedge turbulent flow return alter piece (g46)；Described The skirt section of piston is equipped with double auxiliary skirt rims (g37)；The double auxiliary skirt rims (g37) are that there be not connecting rod pin hole in the original piston of reservation Bilateral two skirt of original on the basis of, and in the following of the bilateral for having connecting rod pin hole in the skirt section of piston (g31), every one side is more Add an auxiliary skirt, becomes double auxiliary skirt rims (g37)；The double auxiliary skirt rims contain bottom edge (g38), lower fillet (g39), side While (g40), upper fillet (g41), bottom edge concave arc while (g42), piston and double auxiliary skirt rims through-hole (g43), the piston its The logarithm line of piston skirt logarithmic differentiation equation is also referred to as isogonal one section and is located at skirt, and the side of the part of skirt is pressure One section of the nearly equal logatithmic spiral by logarithmic differentiation equation of corner connection is equal using the logatithmic spiral tool pressure angle of higher mathematics Feature returns the inclined wedge turbulent flow and alters piece (46) and the pressure such as utilize at scavenging road junction with a Duan Yili of logatithmic spiral Angle generate turbulent flow come block exhaust gas return alter so as to reduce discharge；The double auxiliary skirt rims or with aluminium alloy, or with composite material with Just reduce cylinder prepareding gap；With CNC machining center, tungsten copper electrode is first produced, assists molding with the lathe for having three-dimensional rotation head, then It is produced in batches with die casting machine；It machines and is electroplated again；The left block and its left block of right block and right block are respectively provided with and change The small double auxiliary blow vents to narrow, it is left double auxiliary blow vents (51b) that double auxiliary blow vents, which are located at left block just, and described is double auxiliary Blow vent is located at right block just and is right double auxiliary blow vents (52b), the left block and right block be assemble Face to face, and with The upper surface of scavenging air belt of cylinder body is connected, what two scavenging air belts of the cylinder body were equipped with the left block (g51) respectively Left double auxiliary blow vents (51b) are connected with the double auxiliary blow vents (52b) in the right side that the right block (g52) is equipped with, and are narrowed Double auxiliary blow vents of left and right block are equipped with when double auxiliary blow vents with the skirt section for running to plug near piston lower dead center When double auxiliary skirt rims (g37) are close, be just conducive to narrow local volumetric, increase local air flow pressure and flow velocity and additional turbulence return alter and Drop row；The scavenging air belt of the symmetrical left and right each one of the double auxiliary blow vents and cylinder body (g44) of the narrowed left and right block Each inclined wedge turbulent flow that symmetrically each ground in left and right is equipped with, which returns, on mouth (g45) alters both pieces (g46) adapted, has drop to arrange effect；It is described Double auxiliary blow vents of narrowed left and right block and both double auxiliary skirt rims (g37) for being equipped with of the skirt section of piston adapted, have Drop row's effect；Double auxiliary blow vents of the narrowed left and right block, with sweeping for the symmetrical left and right each one of the cylinder body (g44) Each inclined wedge turbulent flow that symmetrically each ground in left and right is equipped with, which returns, on gas port (g45) alters piece (g46), and the skirt with the piston Double auxiliary skirt rims (g37) three's adapted that portion is equipped with has more drop row's effect；Double auxiliary ventilations of the narrowed left and right block The rear wall (51f) of the double auxiliary blow vents (51b) in the left side that the left block (g51) of mouth is equipped with is thicker, and thinnest part is no less than 2mm, And have oblique angle greater than 10 degree, increase intensity so that root is thicker；The institute of double auxiliary blow vents of the narrowed left and right block The left block (g51) stated is equipped with 4 reinforcement arm pawls (51e), and the rectangular section of each reinforcement arm pawl is thicker, and thinnest part is also many In 2mm, increase intensity so that section is thicker；The left block of double auxiliary blow vents of the narrowed left and right block (g51) it is equipped with long reinforcing rib (51c) near the back side of the double auxiliary blow vents (51b) in the left side being equipped with, to increase intensity to resist Narrow local pressure bigger caused by double auxiliary blow vents；The left case of double auxiliary blow vents of the narrowed left and right block It is equipped with short reinforcing rib (51d) near the back side of the pit of the double auxiliary blow vents (51b) in the left side that seat (g51) is equipped with, it is strong to increase Degree is to resist local pressure bigger caused by narrowing double auxiliary blow vents；The institute of double auxiliary blow vents of the narrowed left and right block The double auxiliary blow vents (52b) in the right side that the right block (g52) stated is equipped with are pits, the length, width and height of pit about with the left block (g51) the double auxiliary blow vents (51b) in the left side being equipped with are identical, to increase intensity, resist bigger caused by narrowing double auxiliary blow vents Local pressure；The double auxiliary blow vents in the right side that the right block (g52) of double auxiliary blow vents of the narrowed left and right block is equipped with (52b) is pit, and the length, width and height of pit are identical as a left side double auxiliary blow vent (51b) that the left block (g51) is equipped with, is being drawn The length and width held up are a height of to be not more than 19x7x4.8mm, with convenient narrowed local volumetric, increase local air flow pressure and flow velocity and Additional turbulence returns and alters and drop row；The exhaust gas of engine not direct emission, but by after one meter five of catalyst hush tube from aluminum pipe Nearly tool bore (28a) indirectly discharge；The cutter contain with cut pile beat the grass wire (54b) moving head (54) it is long with benefit Effect cutting, and the disc cutterbar (64) with inner sawtooth (642) is to prevent allowing knife；And the carburetor of its engine sets four bifurcated nozzles (70a) is with benefit atomization；And the cutter is equipped with the outer protective cover (73) on interior shield (60) and prevents outside it Shield is equipped with the long long grass pressing wheel (74) for being equal to diameter of beating the grass of its roller, in order to press grass soil moisture conservation and meadow decorative pattern；Described cuts What the moving head (54) contained by cutter was had cut, and pile beats the grass wire (54b) is equipped with multiple sharp sword (54a) its multiple point The way of sword is to cut what pile went out under hammering with sharp plain chisel on wire, and the wire is round；Described cuts What the moving head (54) contained by cutter was had cut, and pile beats the grass wire (54b) is equipped with multiple sharp swords (54a), multiple points The way of sword or on wire with there is the plunger chip die of sharp edge to cut what pile went out under the impact of press machine, and the steel wire Line is flat；The knife for 4 stretchings that the disc cutterbar (64) with inner sawtooth (642) contained by the cutter is equipped with The outer cutting edge (641) of periphery be equipped with multiple outer sawtooth (64a), and the inner sawtooth (642) also has 4, and it is every The inner sawtooth of item (642) sets multiple sawtooth；The outer protective cover (73) installed on interior shield (60) set by the cutter Installation card slot (73b) and 2 screw hole locations (73a) are equipped with benefit installation, and are equipped with rope of beating the grass on its outer protective cover (73) Limit (73c), and grass pressing wheel mounting bar (73d) for installing long grass pressing wheel (74) is equipped on its outer protective cover (73) And arc enclosing item (73e)；The long long grass pressing wheel (74) for being equal to diameter of beating the grass of its described roller is rotatable, grass pressing wheel The long diameter for being much larger than its grass pressing wheel of axial length, that is, roller, axial length, that is, roller of grass pressing wheel is long to be at least its grass pressing wheel 3 times of diameter；The diameter of beating the grass refers to that the limit (73c) for the rope of beating the grass that its described outer protective cover (73) is equipped with is arrived The distance of cutter Pivot axle is radius of beating the grass, and 2 times are the diameter of beating the grass；And long its roller of grass pressing wheel (74) is long Equal to beating the grass, diameter then can be just pressed onto the grass just cut；The long long grass pressing wheel (74) for being equal to diameter of beating the grass of described its roller is Rotatable and its grass pressing wheel the long diameter for being much larger than its grass pressing wheel of axial length, that is, roller, axial length, that is, roller of grass pressing wheel 10 times or more of long or its grass pressing wheel diameter, in order to press careless soil moisture conservation；The long length for being equal to diameter of beating the grass of its described roller Grass pressing wheel (74) is equipped with the careless slot (74b) of multiple pressures, and slot is along its roller length direction or straight slot or wavy bending Slot；And the slot cross-section (74a) for pressing careless slot or rectangular or semicircular, and the multiple pressure grass slot is at least 2, in order to press grass to preserve soil moisture and meadow embossing and few skidding；The carburetor of its engine sets four bifurcated nozzles (70a) refers to that on the outlet of the nozzle (70) of the inside of carburetor be four bifurcated nozzles along 4 gaps are set ring week (70a), with improvement mixes combustion fluid state of the vapour through gap and is conducive to atomization；The equal pressure angle logatithmic spiral runner is double-deck Cool down the two-stroke LPG engine eliminated the noise, and is the mixing of compressed piston upper in cylinder near piston top dead center Before gas igniting, since piston train of dress portion moves up and open the preparation air entry in latch-release cylinder, the crankcase below piston The gaseous mixture of interior sucking fuel and air；The pressure of the burning gases of the piston upper generated again due to igniting, piston is from upper dead Point is mobile to bottom dead centre direction and simultaneously closes off air entry, the gaseous mixture in compression crankcase, on the piston of bottom dead center-nearby Face is connected by crankcase with cylinder while the burning gases in cylinder are discharged to outdoor gas from opening and closing exhaust outlet Scavenging access, gaseous mixture is imported into two punchings in cylinder from crankcase by preparation scavenging port in piston upper latch-release cylinder Journey engine；The design has the valve gear with crankshaft-synchronous, this valve be from crankcase to cylinder scavenging mouth, scavenging access Crankcase side is configured to normally closed；The gaseous mixture when valve-closing of the crankcase side of scavenging access, in scavenging access Burning of igniting is allowed to by the flame of combustion gas, after HC reduction again from crankcase to scavenging port, the crankcase side of scavenging access makes Opening, while the burning of scavenging access is sent out with gaseous mixture, the gaseous mixture in crankcase is discharged it from exhaust outlet Preceding closing exhaust outlet, here it is the two cycle engines for substantially reducing the discharge of HC；It solves in pervious structure and above-mentioned The valve of the crankshaft same period is not because being designed, if scavenging port is not opened also after the flame extinction of burning gases, burning gases Flame can make the gaseous mixture ignition in scavenging access and crankcase, make gaseous mixture without supplying in normal direction cylinder, exhaust outlet is opened Mouth it's early stage will make past the opening of scavenging port to open, when the exhaust outlet and scavenging port in cylinder are open at the same time, in crankcase and Unblended mixture in scavenging access enters in cylinder from exhaust outlet, so a part of gaseous mixture is in the state of unburned The problem of being discharged from exhaust outlet, becoming gaseous mixture (i.e. HC) increase in discharge gas；The present invention is in the air entry Except exhaust outlet scavenging port, after crankcase scavenging, opening and closing valve has been added in the crankcase side of scavenging access, in scavenging access Gaseous mixture ignite and burn in the flame of combustion gas, and in scavenging access and crankcase be according to crankshaft synchronizing cycle Valve can be truncated, so the gaseous mixture in crankcase will not burn, while the combustion gas in scavenging access with crankshaft-synchronous When the valve openings in period, the gaseous mixture in crankcase can be extruded out in cylinder, same in exhaust outlet and scavenging port When initial stage when being open, the burning gases in scavenging access are fed into cylinder, from exhaust outlet to external discharged exhaust HC will not be adulterated in gas, when exhaust outlet will close, continued in crankcase in the spent gaseous mixture in scavenging access Unblended mixture be fed into cylinder, so the HC amount adulterated in exhaust gas can control reduction；Described has and song The synchronous valve gear of axis is the c-type circle (56a) for adding crank valve (56) on crankshaft (57), the c-type circle of the crank valve (56) There are the two sides of a bit of opening to be set as the inclined wedge circle (56b) at oblique angle, when the oblique angle that has of the two sides of its a bit of opening Side is rotated with crankshaft, is just had shearing in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and is reduced the work of impact With；The two-stroke LPG engine that metal cap and the cooling of outer resin cover bilayer are eliminated the noise in the tool, it is further characterized in that, it is described Have the valve gear with crankshaft-synchronous, be on crankshaft (57) plus crank valve (56) c-type circle (56a) a bit of opening two Side is equipped with the pressure coil (56f) of logarithm, when the logatithmic spiral side of the two sides of a bit of opening of the pressure coil is with song Axis rotation, just forms the logarithm of pressure angle properties equivalent everywhere in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder Helical influences the effect of air-flow and buffering；The wedge (11b) of noise control strainer in scavenging channel is located at the technique butt strip (55) Side；Catalyst in the scavenging channel beside the technique butt strip (55) equipped with emission reduction rolls up (59) its platiniferous rhodium indium iridium, convection current Crossing gas has catalyst effect and noise control filtering regulating and controlling effect, has regular hour difference and isolation and noise elimination adjustment effect, slows down Exhaust outlet from HC to scavenging channel discharge, to be formed in scavenging channel plus the engine of strainer；Add double sieves in scavenging channel The two-cycle gasoline engine for netting simultaneous scavenging oral area trimmer valve has emission reduction effect and effect up to standard, the strainer in scavenging channel (58) it is located at beside technique butt strip (55), and separately there is strainer (58) to be located under scavenging channel；The strainer in scavenging channel is by more Wire is formed through knitting device, and the strainer in scavenging channel has filtration, and be located under scavenging channel described separately has Strainer, that is, sieve and scavenging oral area trimmer valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder； The two-stroke LPG engine that metal cap and the cooling of outer resin cover bilayer are eliminated the noise in the tool is it is characterized in that, draw two-cycle gasoline The aerodynamic noise analysis of blade, is simulated, side with CFD (computational fluid dynamics) when holding up idle running Method is intended to carry out " numerical experiment " by computer, reappears physical process from point of theory；In the hope of receiving the Numerical-Mode compared with testing The cost that draw up has is low, data easily obtain, the advantages of analyzing from point of theory problem and with computer and model Development, the effect of calculating cycle constantly reduces, and calculated result is more and more accurate；Flow field and field of turbulent flow progress to brush cutter can Row analysis and data analysis, determine the blade of brush cutter and Cutting Road is sound source, simulate to the noise of brush cutter, for The simulation of the trend of noise variation meets reality as far as possible, makes every effort to level of noise and experimental error 10% or so；Noise source and whirlpool Flow noise be set as fluid matasomatism in turbulent boundary layer interact between blade and fluid micellar generate and vortex disengaging, even The variation that continuous spectrum random noise is set as flow regime generates outlet flow pattern modulation and outflow fluid and ambient atmos effect, rotation Noise is set as the fluid of blade drive and stator and surrounding fluid effect generate, experimental data and noise spectrum and display different frequency The noise in region can be related, and blade of brush cutter rotary air dynamics noise basis frequency calculation formula: F=NZ/60, F are noise basis Frequently, N is rotating speed of flail, and Z is blade number；Do progress process: geometrical model is established, computer simulation, is compared with experimental result, Change structure to be simulated, establishes noise model, experimental verification according to analog result；Way is from blade geometry and air duct geometry And rotating speed of flail is started with, and establishes cutting and blade CAD model, unstrctured grid ICEM is generated, with FLUENT fluid data meter Fluid calculation MRF model in rotating machinery is calculated, variable velocity field and pressure field and tubulence energy are considered, with LMS Virtual Lab software obtains noise spectrum, analyzes noise source, obtains noise data and carrys out noise reduction；Stable state tentative calculation parameter setting: grid is 4120000 unstrctured grids and dynamic mesh INTERFACE, turbulence model are RANS (K-EPSILON), and blade rotational speed takes 3000 revs/min, iterative steps take 1000；The trial result has vorticity figure, pressure cloud atlas, speed vector figure, three-dimensional motion pattern, pressure Contour surface figure and planar flow line chart, the trial result there are also blade CAD model generate unstrctured grid, obtain important computations the result is that Engine bush knife speed low noise at 5700-7000 revs/min；Assistant analysis coarse filtration combines two punchings of fine filtering buffering scavenging decompression film Journey LPG engine is it is further characterized in that its revolving speed is 5750 to 6950 turns per minute；Strainer (58) in its scavenging channel is 50 mesh Coarse strainer；And separately having strainer (58) to be located under scavenging channel is fie screen and scavenging oral area trimmer valve by 150 mesh；Deng Pressure angle logatithmic spiral runner bilayer cooling eliminate the noise two-stroke LPG engine it is characterized in that: the two-stroke LPG engine for LPG The mixed airgun controller of gas sets pressure reducing valve membrane sheet；The engine with LPG fuel gas tank is driving gardens machine；It is described Fuel gas tank has LPG combustion gas, contains miniature propane fuel tank, and the front of the miniature propane fuel tank (t20) is equipped with pipe spiral shell Line, so that the fuel enters engine through mixed airgun controller by pipe fitting and works, and the front of the fuel tank is additionally provided with peace Full valve so as to it is in excess of the quota when overflow and rise safety effect；The rear portion of the fuel tank is equipped with tank bottom attic base (t20c), and in institute The base holes (t20d) of tank bottom attic base (20c) equipped with multiple equal distributions are stated with portable；The tank diameter of the fuel tank is less than 98 Millimeter is replaced containing 465 grams of propane fuel by standard；；The two of the equal pressure angle logatithmic spiral runner bilayer cooling noise elimination Stroke LPG engine is it is characterized in that: the muffler ASSY (F7) of the hush tube containing catalyst (69) passes through the silencer pad (F8) It is mounted on the two-stroke LPG engine, the exit of the muffler ASSY (F7), is nearby equipped with interior metal cap (F7C1) Inner outlet (F7C2), then it is outer, be equipped with the outer vent (F7j2) and log channel (F7j3) of outer resin cover (F7j1) at a distance, with Just the double-deck cooling is eliminated the noise.

It continuously improves and two-stroke LPG engine that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise It is characterized in that, it contains the valve gear with crankshaft-synchronous, it is the c-type circle (56a) for adding crank valve (56) on crankshaft (57) Rotation and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the outer diameter of the outer circle of the c-type circle Gap (56 δ) between the oral area of the connection crankcase in the scavenging channel of the cylinder apart from engine 1E37F is in 0.02-0.07 Millimeter；It is further characterized in that the valve gear having with crankshaft-synchronous, is the C for adding crank valve (56) on crankshaft (57) The rotation of type circle (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the one of the c-type circle is small The central angle in two sides to the crankshaft center of circle of section opening is in 82-92 degree.It is filled it is characterized in that, it contains with the valve of crankshaft-synchronous Set, be on crankshaft (57) plus crank valve (56) c-type circle (56a) rotation and the scavenging channel of latch-release cylinder connection crankshaft The oral area of case and formed, the central angle in two sides to the crankshaft center of circle of a bit of opening of the c-type circle is in 84-88 degree；Pressure Contracting is than being not more than 12.It is characterized in that, the valve gear having with crankshaft-synchronous, is to add crank valve on crankshaft (57) (56) rotation of c-type circle (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) be equipped with c-type edge (57a) its be it is corresponding with the described plus a bit of opening of C type circle (56a) of crank valve (56) and Cooperation is realized by a location hole.

It continuously improves and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and by a positioning Pin or a positioning sleeve cooperate to realize, and fixed with three screws.Have and crankshaft-synchronous it is characterized in that, described Valve gear, be on crankshaft (57) plus the c-type circle (56a) of crank valve (56), the c-type circle of the crank valve (56) has one The two sides of segment opening are set as the pressure coil (56f) at oblique angle, when pair of the two sides of a bit of opening of the pressure coil Number helical side is rotated with crankshaft, just forms pressure angle everywhere in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder The logatithmic spiral of properties equivalent influences the effect of air-flow and buffering.

It continuously improves and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the c-type circle of the crank valve (56) have the two sides of a bit of opening to be set as the inclined wedge circle (56b) at oblique angle, work as institute The side for having oblique angle for stating the two sides of a bit of opening of c-type circle is rotated with crankshaft, the company in the scavenging channel of latch-release cylinder Shear flow is just formed when the oral area of logical crankcase and reduces the effect of mutation impact.

It continuously improves and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle are described The axis at oblique angle and every side crankshaft that the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle of crank valve (56) are equipped with The angle of line is in 15-27 degree, when the side for having oblique angle of the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle It is rotated with crankshaft, in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder, just forms shear flow and slow drop mutation The effect of impact.

It continuously improves and the two cycle engine of perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination is beneficial to drop It is mild to eliminate the noise；Its revolving speed is 5750 to 6950 turns per minute；Strainer (58) in its scavenging channel is the coarse strainer of 60 mesh；And it is another It is fie screen and scavenging oral area trimmer valve by 180 mesh that strainer (58), which is located under scavenging channel,.The vapour of engine is to multi-party Squeezed out to dispersion, have a vibration back and forth trembled and to adding fuel to the flames effect of steam flow, in the gas for accelerating fluid and coming from air filter Stream sharply mixes when handing over atomization and is more conducive to polymerize contaminated product effect and diverging mixed effect, is entered with the carburetion state being more atomized Engine；Cutter sets multiple sawtooth, continuously improves and perfect two cycle engine improves the quality of gardens machine.

A kind of engine of improved further noise reduction is additionally provided with strainer i.e. sieve and scavenging oral area in scavenging beneath galleries Trimmer valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed is set as per minute 6300 switch to it is good；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately there is strainer (58) to be located under scavenging channel It is the fie screen of 180 mesh；The catalyst that a plurality of wire is equipped with emission reduction by strainer made of knitting device rolls up (59), platiniferous, rhodium, Indium and rare earth element have catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, and It is to first pass through the hush tube containing catalyst (69), then by function hush tube (54d), assist the tubule of hush tube (54g), fish Squama wedge (54e), variable cross-section air hose (54f) noise reduction, then again by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population Discharge indirectly；There are regular hour delay difference and isolation and noise elimination and obstructs adjustment effect, it is ingenious to slow down pneumatic noise and HC Discharge；The engine of a kind of further noise reduction, which is characterized in that it contains silica gel damping pad (54a), function hush tube (54d), the tubule for assisting hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f)；The cylinder of the engine The exhaust outlet connection hush tube containing catalyst (69), then by function hush tube (54d), auxiliary hush tube (54g) tubule, Fish scale wedge (54e), variable cross-section air hose (54f) noise reduction；The hush tube containing catalyst (69) of the exhaust outlet connection of cylinder block (g44) Outgassing direction side is equipped with the silica gel damping pad (54a) and the variable cross-section air hose (54f) equipped with series winding；The variable cross-section The inside of air hose (54f) is equipped with the function hush tube (54d)；The function hush tube (54d) is the series winding at interval, And the song of the range of decrease along the approximate similar odd function with reference to multiple limited sinusoidal wave trains that one third octave is the period Line is axis；Multiple function hush tube (54d) groups are combined into the length and caliber of each hush tube of multistage noise elimination It all changes, sees that the length of each hush tube is shortened in single file and caliber has step by step toward outgassing direction from front to back It is reduced；Each hush tube that multiple function hush tube (54d) groups are combined into multistage noise elimination is equipped with multiple described Fish scale wedge (54e) and the wedge (50d) for having through-hole；The fish scale wedge (54e) is equipped with the small slot of arc and has through-hole Wedge (50d)；The auxiliary hush tube (54g) of the collateral branch of auxiliary is additionally provided on the function hush tube (54d)；Described is auxiliary Helping hush tube (54g) is tubule, and the tubule has the wedge (50d) of through-hole；The variable cross-section air hose (54f) is to become Section, be at least three swell and have at three be reduce；The variable cross-section air hose (54f) be it is curved, at least Having has turn at three；The main rotating shaft line for blowing paddle wheel fan and the main rotating shaft line of the Wind Volume turbine (54c) have folder Angle just hinders outflow of the main noise of noise along straight central axes directly forwardly and rearwardly；The Wind Volume turbine (54c) comes out Blowing enter the variable cross-section air hose (54f) first function hush tube (54d) being equipped with of inside and the noise elimination The small slot of arc and have the wedge (50d) of through-hole first that multiple fish scale wedges (54e) that pipe is equipped with are equipped with It is compressed and comes out again and expand first order noise elimination process of just completing, the auxiliary that the function hush tube (54d) is equipped with The tubule of the auxiliary hush tube (54g) of collateral branch is to provide some outlets for air-flow more and all not mix away from supervisor so as to further Improve noise elimination effect；The variable cross-section air hose (54f) is variable cross-section, and air-flow is swollen to compressing from swollen portion bit stream to position is reduced It is swollen to have booster action；The variable cross-section air hose (54f) is that curved have turn to have booster action to preventing main noise from directly spreading out of； The air-flow come out from first function hush tube (54d) for completing first order noise elimination process, in the variable cross-section air hose (54f) It is expanded in the cavity of swell, and through bend, the second function hush tube (54d) all changed subsequently into length and caliber is simultaneously Through auxiliary hush tube (54g) and the small slot of arc of fish scale wedge (54e) and being compressed again for the wedge (50d) that has through-hole It expands and completes the noise elimination process that there is frequency variation of making an uproar in the second level；Complete second level noise elimination process from second function hush tube The air-flow that (54d) comes out, expands, and through bend in the cavity of the swell of the variable cross-section air hose (54f), subsequently into length And the third function hush tube (54d) that all changes of caliber and through the auxiliary hush tube (54g) and fish scale wedge (54e) The small slot of arc and have through-hole wedge (50d) compression-expansion and after completing third level noise elimination process, from the air port of diminution Noise abatement is blown out, is then discharged indirectly by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again.

Detailed description of the invention

Present invention will be further explained below with reference to the attached drawings and examples.

Fig. 1 is the schematic diagram of brush cutter.

Fig. 2 is the perspective view of the explosion of the top half of brush cutter.

Fig. 3 is the perspective view of the explosion of the lower half portion of brush cutter.

Fig. 4 is the schematic diagram for removing outer cover and shield of brush cutter.

Fig. 5 is perspective view of the explosion of the brush cutter containing engine.

Fig. 6 is the diagrammatic cross-section of the carburetter body containing four bifurcated nozzles (70a) of brush grass-mowing machine engine.

Fig. 7 is the three-dimensional signal of the carburetter body containing atomizer of brush grass-mowing machine engine and carburetor assembly (F56) Figure.

Fig. 8 is the brush grass-mowing machine stereoscopic schematic diagram for having the disc cutterbar of inner cutter hole (642) and outer cutting edge (641).

Fig. 9 is the brush grass-mowing machine local overlooking schematic diagram for having the disc cutterbar of inner cutter hole (642) and outer cutting edge (641).

Figure 10 is the stereoscopic schematic diagram that outer protective cover is equipped with the long long grass pressing wheel (74) for being equal to diameter of beating the grass of its roller.

Figure 11 is the stereoscopic schematic diagram of the disc cutterbar of the belt length grass pressing wheel of brush grass-mowing machine.

Figure 12 is the stereoscopic schematic diagram of the stock of brush grass-mowing machine and disc cutterbar that band is beaten the grass.

Figure 13 is the stereoscopic schematic diagram for the disc cutterbar that the band of brush grass-mowing machine is beaten the grass.

Figure 14 is the diagrammatic cross-section of piston.

Figure 15 is to return to alter the two of the piece reduction discharge three-dimensional signal for rushing gasoline engine cylinder with scavenging road junction inclined wedge turbulent flow Figure.

Figure 16 is to return to alter the two of the piece reduction discharge partial enlargement for rushing gasoline engine cylinder with scavenging road junction inclined wedge turbulent flow Schematic diagram.

Figure 17 is to narrow double auxiliary blow vents of left and right block to reduce the two of discharge and rush the positive of the left block of petrol engine Schematic diagram.

Figure 18 is that double auxiliary blow vents of narrowed left and right block reduce the two of the discharge reverse side for rushing the left block of petrol engine Schematic diagram.

Figure 19 is the stereoscopic schematic diagram of two installation sites for rushing petrol engine original left and right block.

Figure 20 is that double auxiliary blow vents of narrowed left and right block reduce the two of the discharge schematic diagram for rushing the right block of petrol engine.

Figure 21 is that double auxiliary blow vents of narrowed left and right block reduce the receipts for the left and right block that the two of discharge rushes petrol engine Narrow double auxiliary blow vents close on plus the schematic diagram of the piston of double auxiliary skirt rims.

Figure 22 is that double auxiliary blow vents of narrowed left and right block reduce the two of the discharge middle section for rushing the left block of petrol engine Schematic diagram.

Figure 23 is the schematic diagram of the another angle of cylinder body of the scavenging road junction equipped with technique butt strip (55).

Figure 24 is the schematic diagram of the cylinder body for the two-cycle gasoline engine that partial cut-out shows layered scavenging in cylinder.

Figure 25 is the schematic diagram for the layering gas storage piston that partial cut-out shows sectional cross section.

Figure 26 is the schematic diagram of the layering gas storage piston of partial cut-out.

Figure 27 is the schematic diagram for the layering gas storage piston that partial cut-out shows sectional cross section.

Figure 28 is the schematic diagram of the crosscutting layering gas storage piston for showing cutting cross section in part.

Figure 29 is the schematic elevation view for being layered gas storage piston.

Figure 30 is that the complete section of layering gas storage piston cuts the schematic diagram of cross section.

Figure 31 is the schematic diagram for being layered gas storage piston and crankshaft-link rod.

Figure 32 is the schematic diagram of the cylinder body for the two-cycle gasoline engine that partial cut-out shows layered scavenging in cylinder.

Figure 33 is the schematic diagram of the cylinder body for the two-cycle gasoline engine for removing butt strip and showing the layered scavenging in cylinder.

Figure 34 is the schematic diagram of conventional crankshaft-link rod.

Figure 35 is the schematic diagram for adding the crankshaft (57) and connecting rod of the c-type circle (56a) of crank valve (56).

Figure 36 is the schematic diagram for adding the cylinder body of c-type circle (56a) and two-cycle gasoline engine of crank valve (56).

Figure 37 is plus the signal of the cylinder body of the c-type circle (56a) of crank valve (56) and gap (56 δ) and two stroke engine Figure.

Figure 38 is the schematic diagram for adding the c-type circle (56a) of crank valve (56).

Figure 39 is the schematic diagram for adding the c-type edge (57a) of crankshaft (57) of crank valve (56).

Figure 40 is the schematic diagram for adding the cylinder body of c-type circle (56a) and two stroke engine of crank valve.

Figure 41 is the schematic diagram for adding the inclined wedge circle (56b) of crank valve (56).

Figure 42 is the schematic diagram for adding the pressure coil (56f) of crank valve (56).

Figure 43 is the schematic diagram of the strainer (58) in scavenging channel.

Figure 44 is the schematic diagram of the wedge (11b) of the noise abatement in scavenging channel.

Figure 45 is the schematic diagram of the another side of the wedge (11b) of the noise abatement in scavenging channel.

Figure 46 is the schematic diagram of the another side of the catalyst volume (59) of the emission reduction in scavenging channel.

Figure 47 is the diagrammatic cross-section put on piston stroking upward to scavenging port.

Figure 48 is the diagrammatic cross-section put under piston stroking upward to scavenging port.

Figure 49 is diagrammatic cross-section of the piston stroking upward to top dead centre.

Figure 50 is the diagrammatic cross-section that piston downlink is in position on exhaust outlet top.

Figure 51 is that piston comes downwards to the diagrammatic cross-section put on scavenging port.

Figure 52 is diagrammatic cross-section of the piston to lower dead center.

Figure 53 is the diagrammatic cross-section of exhaust close.

Figure 54 is diagrammatic cross-section when air entry starts to open.

Figure 55 is to add the diagrammatic cross-section of the two-cycle gasoline engine of double sieves and scavenging oral area trimmer valve in scavenging channel.

Figure 56 is a kind of noise figure of method analyzed with computer numerical computer aided simulation aerodynamic noise.

Figure 57 is the schematic diagram of two-cycle gasoline engine LPG propane container (t20).

Figure 58 is the schematic diagram of the rear side of double coarse filtration combination fine filtering buffering valve chambers.

Figure 59 is the schematic diagram of double coarse filtration combination fine filtering buffering valve chambers.

Figure 60 is the stereoscopic schematic diagram that the cutting of metal cap and outer resin cover bilayer cooling silencer in having is opened.

Figure 61 is the diagrammatic cross-section of metal cap and outer resin cover bilayer cooling silencer in having.

Figure 62 is the schematic diagram of Wind Volume turbo-axial lithium hair drier.

Figure 63 is the schematic diagram of the side cutting of fish scale wedge (54e).

Figure 64 is function hush tube (54d) and the schematic diagram for assisting hush tube (54g).

As shown, in figure:

1. being two cycle engine；2. being hexagon socket cap head screw M6x30；3. being hexagon socket cap head screw M5x8；4. It is 1 type hex nut M6；5. being PP wire clamp；6. being PA hanging ring；7. being 41 type non-metallic insert hexagonal locking nut M5；8. being POM hanging ring fixing seat；9. being hexagon socket cap head screw M5x20；10. connecing aluminum pipe before being11. being manipulation hand Assembly；12. being control handle pipe；13. being 13 band spring washer hexagon socket cap head screw M5x25；14. being hand handle fixing seat Upper clamp plate；15. being hand handle fixing seat；16. being left handgrip component；17. being nitrile rubber hand handle shock-absorbing sleeve；18. being that hand handle is fixed Seat lower clamp plate；19. being left handgrip pipe；20. being five leaf nylon tubes21. being transmission shaft22. being zanjon Ball bearing；23. being spring washer 6；24. being hexagon socket cap head screw M6x23；25. being aluminium tube joint；26. being locking knob；27. It is shaft adapter；28. being rear aluminum pipe29. being 4 hexagon socket cap head screw M5x12；30. being 4 bullets Spring washer 5；31. being limit handle spring；32. being limit handle lock；33. being limit handle；34. being split washer 2.5；35. It is shield fixing seat；36. being circlip for hole 26；37. being circlip for shaft 10；38. being roundlet gear with curved teeth；39. being Small arc-shaped gear oil is stifled；40. being hexagon socket cap head screw M6x14；41. being hexagon socket cap head screw M6x10；42. being flat Washer 6；43. being gear-box；44. being great circle gear with curved teeth；45. being splined shaft；46. being deep groove ball bearing 6002；47. being hole bullet Property retaining ring 32；48. being gear-box shield；49. being spline pad；50. being 3 tooth disc cutterbars；51. being cutterhead pressing plate；52. being cutterhead shield Cover；53. being that 1 type hex nut M10 is left-handed；54. being nylon moving head；54a. is sharp sword；54b. is to cut pile to beat the grass wire； 55. being harness；56. being hexagon nut with flange M5；57. being small blade；58. being knife rest；59. being cross recessed pan head tapping screw ST4x14；60. being interior shield；61. being shielding support；62. being hexagon socket cap head screw M5x35；63. being 2 tooth cutteves Disk；64. being disc cutterbar；65. being 8 tooth disc cutterbars；16-1. being left handgrip；16-2. is 1 type hex-head nut M5；16-3. being ten Word slot pan head screw M5x20；16-4. is Cross Recess Head Screw M5x30；66. being the waistband for having pallet；67. being pallet；68. It is that auxiliary turns ball；69. being catalyst hush tube；70. being the interior straight tube of atomizer；70a. is four bifurcated nozzles；71. being to have helicla flute Vortex spray bar；72. being that atomizer has a parabolical horn mouth；73. being outer protective cover；73a. is screw hole location；73b. It is installation card slot；73c. is the limit of rope of beating the grass；73d. is grass pressing wheel mounting bar；73e. being arc enclosing item；74. being long pressure grass Wheel；641. be outer cutting edge；64a. is outer sawtooth；642. be inner sawtooth；74a. is the pressure grass slot cross-section of long roller grass pressing wheel； 74b. is multiple pressure grass slots of long roller grass pressing wheel；19b. is the damping adapter tube (19b) for having close circle helical spring shape；It F1. is starting Device assembly；It F2. is starting driver plate component；It F3. is 2 oil sealings；It F4. is right case；It F5. is 2 deep groove ball bearings；It F6. is 2 Hexagonal cylindrical head plain cushion screw assemblies M5 × 45 in torque 7-9NM；It F7. is the muffler ASSY for contacting matchmaker's hush tube (69)； It F8. is silencer pad；It F9. is the right shock-reducing sleeve of fuel tank；It F10. is 2 retaining ring for piston pins；It F11. is piston pin；It F12. is needle roller Bearing；It F14. is piston ring；It F15. is crank assemblby；It F16. is woodruff key；It F17. is cylinder block pad；It g44. is cylinder block； It F19. is 2 interior hexagonal cylindrical head screw assemblies M5 × 20；It F20. is engine enclosure；F21. be recessed pan head tapping screw ST5 × 14；It F22. is igniter assembly；It F23. is 2 cross fluting screw assemblies M4 × 20；It F24. is spark plug；It F25. is no asbestos Rubber slab mould assembling pad；It F26. is 2 mould assembling positioning pins；It F27. is left box body；F28. be 5 crosses fluting screw assemblies M5 × 25；It F29. is magnetic flywheel；It F30. is clutch assembly；It F31. is clutch disk；It F32. is circlip for shaft；It F33. is fuel tank Left shock-absorbing sleeve L (F33)；It F34. is the right shock-absorbing sleeve R of fuel tank；It F35. is inserts bearing connection seat；It F36. is 3 cross fluting groups Close screw M5 × 20；It F37. is upper clamp plate shock-absorbing sleeve；It F38. is lower clamp plate shock-absorbing sleeve；It F39. is upper clamp plate；It F40. is lower clamp plate； It F41. is 2 interior hexagonal cylindrical head screw assemblies M5 × 18；It F42. is flame-out wire clamp；It F43. is air filter seat；It F44. is 2 Air filter seat pad set；It F45. is soft polyurethane foam filter core；It F46. is air filter pressing plate；It F47. is 2 M5 spring washers；F48. It is 2 cross fluting coiled hair bullet screw M5 × 63；It F49. is air filter lid；F50. be cross fluting coiled hair screw assemblies M5 × 14；It F51. is 2 air inlet pipe pads；It F52. is deflector；It F53. is polyphenylene sulfide PPS air inlet pipe；It F54. is grounding wire component； It F55. is no asbestos packing sheet carburetor packing；It F56. is carburetor assembly；It F57. is PU yellow transparent oil return pipe；It F58. is PU Black oil inlet pipe；It F59. is oil-resistant acrylonitrile-butadirubber rubber oil pipe seat；It F60. is fuel filter assembly；It F61. is oil pipe clip；F62. it is HDPE is blow molded fuel tank；It F63. is cap assembly of fuel tank；It F64. is 5-7NM hexagon-headed bolt plain cushion combination M6X14；It F65. is 4 3- 5NM cross fluting screw assemblies M5X18；It g31. is piston (g31)；It g37. is double auxiliary skirt rims (g37)；G38 is double auxiliary skirt rims Bottom edge (g38)；G39 is lower fillet (g39)；It g40. is the side (g40) of double auxiliary skirt rims；It g41. is upper fillet (g41)；G42. it is The concave arc side (g42) on bottom edge；It g43. is the through-hole (g43) of piston and double auxiliary skirt rims；It g44. is cylinder body (g44)；It g45. is scavenging Road junction (g45)；It g46. is that inclined wedge turbulent flow time alters piece (g46)；It g47. is that inclined wedge turbulent flow goes back to the scavenging road junction (g47) for altering piece；g48. It is the inclined wedge (g48) at logical scavenging road junction；It g49. is that returning for the logical scavenging road junction that inclined wedge turbulent flow time alters piece alters grid (g49)；G50. it is The turbulent shield (g50) at logical scavenging road junction；51b. is left double auxiliary blow vents (51b)；52b. is right double auxiliary blow vents (52b)； g51. It is left block；51b. is left double auxiliary blow vents；51C. is long reinforcing rib；51d. is short reinforcing rib；51e. is reinforcement arm pawl； 51f. is rear wall；It g52. is right block；52b. is right double auxiliary blow vents；53. being that two air flue walls are also known as scavenging air belt partition wall；53a. It is the foot of a wall portion；53b. is rear metope；53c. is preceding metope；53d. is wall end；53j. is Fourier function notch；54. being tool Periodic function gibbs overshoot convergence wave Fourier piece wall；54j. is transition inflection point；54k. is fluctuating convex-concave；51g. is left oblique side Face；51y. is left straight sided；51h. is left broad side surface；52g. is right prism；52y. is right straight sided；52h. is right wide side Face；31a. is gas storage pit；31b. is crosscutting hatching；44a. is blow vent；44b. is into gas port；44c. is into air Mouthful；44d. is the first scavenging port；44f. is the second scavenging port；44e. is envelope high-wall；55. being technique butt strip；55g. is interval It is stupefied；55e. is interval notch；55d. is the first scavenging side wall；55d. is the second scavenging side wall；44j. is perforation heat release hole；44k. It is straight-through heat release hole；(44x, 44v) is to reinforce heat dissipation in flakes；56. being crank valve；56a. is c-type circle；57. being crankshaft；56 δ are Gap；57a. is c-type edge；56b. is inclined wedge circle；56f. is pressure coil；58. being strainer；59. being catalyst volume；It t20. is miniature LPG propane fuel tank；It t20c. is tank bottom attic base；It t20d. is the base holes of tank bottom attic base (t20c)；It F7C1. is interior metal cap； It F7C2. is inner outlet；It F7j1. is outer resin cover；(F7j2) is outer vent；It F7j3. is log channel；The nearly knife of 28a. aluminum pipe Hole (28a)；54a. resilient cushion 54a；54g. assists hush tube 54g；54d. function hush tube 54d；54e. fish scale wedge 54e； 54f. variable cross-section air hose 54f.

Specific embodiment

To make up mobile jib micro the phenomenon that rocking caused by the existing mechanism of brush grass-mowing machine, one kind provided by the invention is used for The main aluminium bar of the length of the improvement of brush cutter is fastened as in catalase hush tube loading machine, and with F41 screw；Exhaust gas is set to pass through silencer Assembly and catalase hush tube 69, then by long main aluminium bar, and arranged from the gap of the close cutter of aluminium bar end or aperture gap Out.

50% or more power per liter can be improved relative to four-stroke engine with two stroke engine in brush cutter, but is discharging On to take measures；Grass-mowing machine is portable dam, it is desirable to which power is light and small；Former stock is changed to the noise elimination of more honeycombs and catalase Pipe, from distal exit；Usefulness is to change to be hovered around by the exhaust gas of the engine direct emission by person of modern times originally, portion Point exhaust gas can be sucked by engine and carburetor air inlet, and the situation that portion can be sucked by people, after catalase hush tube between The method put of running in makes to discharge low and discharge outlet far from people, safer, and emission reduction reinforcement；There is transparent shield to be more convenient for seeing It examines, the mode of operation of the new pallet waistband of brush cutter is additionally provided, when expanding operating radius, that is when encountering big filling Wood when reaching treetop, or will cut at a distance and when having puddle blocking, with the lengthening mode for engine being put into pallet waistband, make Cutterhead elongation, this also easily more stable operation.There is transparent shield, is the local transparent or all saturating on the shield of cutter It is bright, it can preferably observe and cut off and operate, reduce card resistance.There is the bush knife of periphery blade and inner circumferential blade, it will be apparent that improve Brush allows branch and card resistance.There are also the steady stock interfaces of side flange and lateral filament button, have spiral spring or wave spring and subtract The hand handle of vibration has the carburetor of inside spin whirlpool nozzle；The environmental protection of grass-mowing machine is improved with Low-emission gasoline machine and multinomial measure Quality and usability.Low-emission gasoline grass-mowing machine beats the grass wire 54b's with cutting pile it is characterized in that the cutter contains Moving head 54 is with the long-acting cutting of benefit, and the disc cutterbar 64 with inner sawtooth 642 to prevent allowing knife；And the carburetor of its engine is set Four bifurcated nozzle 70a are with benefit atomization；And the cutter is equipped with interior shield 60 and outer protective cover 73 and in its outer protection Cover is equal to the long grass pressing wheel 74 for diameter of beating the grass equipped with its roller length in order to press grass to preserve soil moisture and meadow decorative pattern, therefore its usefulness It is more.

It is set on what the moving head 54 contained by the cutter of Low-emission gasoline brush cutter was had cut pile beats the grass wire 54b There are multiple sharp sword 54a, the way of multiple point swords is to cut what pile went out under hammering with sharp plain chisel on wire.Alternatively, What the moving head 54 contained by cutter was had cut, and pile beats the grass that wire 54b is equipped with multiple sharp sword 54a, multiple point swords Way be on wire with have the plunger chip die of sharp edge cut under the impact of press machine pile go out.Pile is cut to beat the grass wire ratio Nylon wire is durable mostly, is not only conducive to long-acting cutting, few with line, saves into disk nylon wire；And it can beat the grass, moreover it is possible to straw is cut, And nylon wire cuts motionless thin bar；Beat the grass wire when cutting different objects and disc cutterbar complement each other it is each has something to recommend him.Cutter institute The outer cutting edge 641 of the periphery of the knife for 4 stretchings that the disc cutterbar 64 with inner sawtooth 642 contained is equipped with is equipped with multiple outer Sawtooth 64a, and the inner sawtooth 642 also has 4, and its every inner sawtooth 642 sets multiple sawtooth, thus it is handy.Cutting The outer protective cover 73 installed on the interior shield 60 that device is equipped be equipped with installation card slot 73b and 2 screw hole location 73a with Benefit installation, and the limit 73c equipped with rope of beating the grass on its outer protective cover 73, and be equipped on its outer protective cover 73 for installing length The grass pressing wheel mounting bar 73b and arc enclosing 73b of grass pressing wheel 74, therefore be easily installed.Its described roller is long straight equal to beating the grass The long grass pressing wheel 74 of diameter is rotatable, the long diameter for being much larger than its grass pressing wheel of axial length, that is, roller of grass pressing wheel.Its 2 times i.e. For the diameter of beating the grass；And the long diameter of beating the grass that is equal to of long its roller of grass pressing wheel 74 then can just be pressed onto the grass just cut, therefore press Careless effect is obvious.The long long grass pressing wheel 74 for being equal to diameter of beating the grass of its roller is rotatably that axial length, that is, roller of grass pressing wheel is long Much larger than the diameter of its grass pressing wheel, that is to say, that the axial length of its grass pressing wheel, that is, roller length is 10 times of the diameter of its grass pressing wheel, Not only convenient for pressure grass soil moisture conservation, but also material-saving, and if being conducive to pressure grass because advancing due to equally distance wheel footpath more carefully can roll several circles more.Wheel is too Thick then take material, what is also turned is excessively slow, and dash is few, rolls difference.Roller is long convenient for covering face, high-efficient；So with the pressure of thin length Grass wheel.Again because the long long grass pressing wheel 74 for being equal to diameter of beating the grass of its described roller is equipped with the careless slot 74b of multiple pressures, slot is long along its roller Direction or straight slot or wavy curved slot；And the slot cross-section 74a for pressing careless slot or rectangular, or half It is circular, therefore few skidding convenient for the soil moisture conservation of pressure grass and meadow embossing.Moreover the carburetor of the engine sets the spray of four bifurcateds Mouth 70a refers to that on the outlet of the nozzle 70 of the inside of carburetor be four bifurcated nozzle 70a along 4 gaps are set ring week, therefore It improves mixing combustion fluid state of the vapour through gap and is conducive to atomization；The carburetor of its engine sets four bifurcated nozzles 70a refers to that on the outlet of the nozzle 70 of the inside of carburetor be four bifurcated nozzle 70a along 4 gaps are set ring week, to change Good mixing fires fluid state of the vapour through gap and is conducive to atomization.Or in the carburetor assembly F56, improve atomizer It also along 4 gaps are set ring week is four bifurcated nozzle 70a that interior straight tube 70, which is on the outlet for have the vortex spray bar of helicla flute 71, It or is 3 bifurcateds, or be 5 bifurcateds, or be six bifurcateds, or be 7 bifurcateds, or be eight bifurcateds；If 1 gap or 2 gaps, then Vapour is irregular out；If 9 or more gaps, because outlet is less than 3mm, then gap is too fine and closely woven.When oil and gas is passed through in the carburetor The interior straight tube 70 of improvement atomizer in assembly F56 has the import of the vortex spray bar of helicla flute 71 to be set as parabolical loudspeaker The horn mouth of the archimedes curve of mouth 72 or conical section pours the interior straight tube 70 and has the vortex of helicla flute 71 Spray bar, then and then from the outlet of the spray bar along 4 gaps or 3-8 gap set in ring week to multi-direction dispersion Squeeze out, rather than only squeezed out from a hole to a direction, but by the outlet between the multiple gaps set in ring week institute's shape At multiple its have the vibration back and forth trembled because of cantilever beam principle and to the steam flow effect of adding fuel to the flames, will be in gasoline engine Air-breathing moment, in the aditus laryngis key position of this trunnion, when accelerating fluid sharply to mix with the air-flow to come from air filter to hand over atomization And be more conducive to polymerize contaminated product effect and diverging mixed effect, two cylinder bodies for rushing gasoline engine are entered with the carburetion state being more atomized In the scavenging road junction g45 of the symmetrical left and right each one of g44, then the inclined wedge turbulent flow time being equipped with through it alters piece g46 effect and enters two The piston for rushing gasoline engine is formed by combustion chamber with cylinder body therefore is conducive to week and reciprocally works.The air mass flow system of known carburetor It counts in Reynolds number 8x (1000-100000) range only 0.05 or so, and the discharge coefficient of main jet is true with the aditus laryngis of this trunnion The increase of reciprocal of duty cycle, that is, Reynolds number increases and increased dramatically so as to cause the reduction of Carburettor performace curve and mixture strength is become In enriching；Multiple of the aditus laryngis of this trunnion its have the vibration back and forth trembled be more advantageous to acceleration atomization i.e. acceleration carburetion.It narrows The inclined wedge turbulent flow that double auxiliary blow vents of left and right block and the scavenging road junction g45 of cylinder body g44 are equipped with, which returns, alters piece g46, and and piston Double auxiliary skirt rims g37 three's adapted for being equipped with of skirt section, have more drop row's effect.It is the knot for collecting many years domestic and foreign experience and groping It is brilliant；There is the emission reduction of batch production effect up to standard, can not only be marked up to 50 grams, and 39.9 grams can be dropped to, safety coefficient is big, waster Few, this is significant to large quantities of volume productions.It has determined that in the application of two cycle engine and starts batch to produce, and implies from now on 20 The developing direction of year Low-emission gasoline brush cutter.The present invention relates to the noise elimination of two cycle engine improvement, have function wave combustion chamber and Float electrode collocation, has double auxiliary skirt rims, has scavenging air belt inclined wedge piece, energy-saving and emission-reduction are up to standard, and multi-functional, and bright spot is significant；But people The invention that class aspires after perfection is endless, therefore spinning is repeated not to the utmost in the hope of casting a brick to attract jade.

For scavenging ventilation, in scavenging channel plus catalyst is rolled up, and adds strainer (58), if technique butt strip (55), if multiple Wedge (11b), C-shaped valve etc. style open multiple new ways in scavenging air belt energy emission reduction in two-cycle gasoline engine, although The mechanism of its atom level needs the following exploration, but it has determined that in the application of two-stroke gasoline engine scavenging air belt.

A kind of return with scavenging road junction inclined wedge turbulent flow alters piece and reduces the two-cycle gasoline engine of discharge, comprising cylinder body and Well known combustion chamber, spark plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, Cooling system, gas handling system, the cylinder body (44) be two-cycle gasoline engine dress piston cylinder chamber on along center The symmetrically cylinder body (44) at the scavenging road junction (45) containing left and right each one, it is characterized in that: in the symmetrical of the cylinder body (44) On the scavenging road junction (45) of left and right each one, respectively symmetrically each ground in left and right is equipped with inclined wedge turbulent flow time and alters piece (46), with benefit in scavenging At road junction generate turbulent flow come block exhaust gas return alter so as to reduce discharge.

A kind of scavenging road junction logarithmic differentiation equation turbulent flow returns the two-cycle gasoline engine for altering piece drop row, containing cylinder body and Well known combustion chamber, spark plug, cylinder cap, piston, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, Cooling system, gas handling system, the cylinder body (44) be two-cycle gasoline engine dress piston cylinder chamber on along center The symmetrically cylinder body (44) at the scavenging road junction (45) containing left and right each one, it is characterized in that: in the symmetrical of the cylinder body (44) On the scavenging road junction (45) of left and right each one, respectively symmetrically each ground in left and right is altered piece (46) equipped with inclined wedge turbulent flow time, and main body is pressure One section of the nearly equal logatithmic spiral by logarithmic differentiation equation of power corner connection is equal using the logatithmic spiral tool pressure angle of higher mathematics Feature then gush mixed air-flow on it as soon as returning the turbulent flow added alters section that piece has logatithmic spiral easily steadily, existed with benefit Block exhaust gas time at scavenging road junction using equal pressure angle generation turbulent flow to alter to reduce discharge.

Scavenging road junction logarithmic differentiation equation turbulent flow is taken to return the master for altering the piece of two-cycle gasoline engine of piece drop row One section of body establishes differential equation d ρ/d θ=k ρ:

It is equal everywhere because wanting pressure angle λ if polar equation ρ=ρ (θ), therefore tg λ=constant, tg λ=k is enabled,

By pressure angle formula tg λ=ρ '/ρ,

Just there is ρ '/ρ=k,

Differential it, just have differential equation d ρ/d θ=k ρ

D ρ/d θ=k ρ is solved, both sides integrate after variables separation:

∫ d ρ/ρ=∫ kd θ is easy to get because of ρ > 0:

Ln ρ=k θ+C,

Namely:

A therein is constant, is the primary condition of the size and CNC machine by workpiece and mold to determine.

Using PRO/ENGINEER WILDFIRE mapping software, working directory is newly set, creates part,

Parameter (PARAMETER) 1:C real number (real number) is established, it can be with being assigned between 0.01-1 according to specific operating condition Value, such as 0.3；C is also referred to as wave height.

Establish parameter (PARAMETER) 2:N integer (integer), can with according to specific operating condition between 2-100 choosing value, example Such as 13；N is also referred to as wave number.

Opening relationships (RELATION), i.e., equation is:

Logarithmic curve:

Z=0

X=10*t

Y=log (10*t+0.0001)

Produce logarithmic curve；

Followed by using rotation, merging, hypostazation etc. is instructed, and is assembled and merged with workpiece, can be modeled；

It is modeled again with the equation and PRO/ENGINEER WILDFIRE, inputs CNC machining center, used CIMATRO or MASTCAM, the punching block of pack alloy processed, or assisted with milling machine, planer and electrical spark working work；Use electric spark When processing, CNC machining center is inputted with the equation, then first to produce tungsten copper electrode, with the lathe for having three-dimensional rotation head, It is produced in batches again with die casting machine；It machines again；Or piston skirt is welded on the piece separately made.Logarithmic curve cam, intermediate work are answered Meeting.

With reference to higher mathematics Method of Mathematical Physics in Fourier function the continuous transition of rectangular wave overshoot Ji Bu The overshoot convergence wave of this phenomenon and with reference to lag theorem, shifting theorem, convolution theorem and it is single by the approximation of Fourier function Circular frequency and be unfolded be approximately the frequency spectrum gradually decayed for copying fourier series to draw it is multiple from greatly become smaller from it is thin become it is close Spike, it should be the high level overview of many actual phenomenons that mathematical physics is discribed, and engine blow-through air turbulent motion rule is not yet It should make an exception and surmount completely, should also have certain similar or inherent correlation or bring out the best in each other ought more or less use for reference it；In compression mod Shaping mould mold core on, manufacture and imitate the close and relevant Fourier function notch (53j) in inherence that is seeming and high-wall The transition inflection point (54j) on top have at least one close to 90 degree turn shape its be approximately gibbs overshoot convergence wave i.e. imitate Fourier series gibbs overshoot phenomenon draw gradually approach rectangle transition wave and be approximately that imitative fourier series are drawn The frequency spectrum gradually decayed have it is multiple from becoming smaller greatly from the thin fluctuating convex-concave (54k) for becoming close spike；So as to molding cylinder body Idiotype body such as mainstay and influence air-flow.There is having for suitable linear characteristic with imitative higher mathematics function and Fourier person's movements and expression The transition inflection point (54j) and imitative Fourier grade on the top of the Fourier function notch (53j) and high-wall of guidance and damping characteristic Having for the frequency spectrum gradually decayed that number is drawn is multiple comprehensive to noise from the thin fluctuating convex-concave (54k) for becoming close spike from becoming smaller greatly High frequency band, rate of explosion, compression ratio are advantageous.

With reference to higher mathematics Method of Mathematical Physics in family of parabolas equipotentiality streamline quadratic function curve shape, to point The flow direction of more gas storage of layer gas storage piston has directive significance.The side parabolic of scavenging air belt is leaned in the outside of the envelope high-wall (44e) The equipotentiality streamline of line race can use CNC numerical control processing.One section of scavenging air belt logatithmic spiral can also use CNC numerical control processing, logarithm spiral shell It has pressure angle equal advantage everywhere to line, that is, equiangular spiral, is conducive to the air motion of scavenging air belt.Two scavenging air belt interworkings, the Sweep its equal everywhere, and two of the equipotentiality streamline of the second scavenging road junction family of parabolas that have pressure angle of gas port equiangular spiral Secondary function curve shape, the Method of Mathematical Physics that higher mathematics is imitated at scavenging road junction is R&D direction, is answered with the test of high number scientific guidance It is got well than blindness is gathered together.It should be the high level overview of many actual phenomenons that mathematical physics is discribed, and engine blow-through air rule is not yet It should make an exception.

The two-stroke LPG that the equal pressure angle logatithmic spiral runner bilayer cooling of the catalyst scavenging gasoline brush cutter is eliminated the noise Engine, which is characterized in that the strainer (58) in the scavenging channel is located at beside the technique butt strip (55), the scavenging Strainer in channel is to be formed by a plurality of wire through knitting device, to breathing has filtering regulation to make between gas and crankcase in cylinder With；Noise control strainer in scavenging channel is equipped with multiple wedges (11b), and the wedge is multiple hollow six prismatics, has aperture on top, The advanced wedge compression of air-flow, then escape and expand from wedge aperture, there are noise control filtering regulation and noise elimination effect；In technique butt strip (55) in the scavenging channel beside equipped with emission reduction catalyst roll up (59), platiniferous rhodium indium iridium, to flow through gas have catalyst effect and Noise control filters regulating and controlling effect, has regular hour delay difference and isolation and noise elimination effect and obstructs adjustment effect, ingenious to slow down The discharge of pneumatic noise and HC.

The two-stroke LPG engine that the equal pressure angle logatithmic spiral runner bilayer cooling continuously improved is eliminated the noise, piston outside The gas storage pit (31a) of ad hoc left and right each one, it slightly resembles a pear in shape the gas storage pit, there is concentric reducer, at piston pin axle bed Smaller, far from larger at piston pin axle bed, the crosscutting hatching (31b) of the gas storage pit is curve, the gas storage pit Crosscutting hatching (31b) section thickness be greater than 2mm, the curve of the crosscutting hatching (31b) of the gas storage pit be throw The equipotentiality streamline of Wu Xian race, one section of streamline are that the flow function of Method of Mathematical Physics is imitated to meet Laplace's equation The quadratic function of the family of parabolas of the analytical function of harmonic function is conducive to gas storage scavenging.The equipotentiality streamline and tool of family of parabolas Logatithmic spiral has fair line and guidance and damping characteristic with imitative higher mathematics function, and synthesis is to noise high frequency band, pressure Increase ratio, compress when layered scavenging it is advantageous.The upper top of second scavenging side wall (55d) of the technique butt strip (55) is parabolic The quadratic function curve of line race is so as to the equal potential barriers with the outside of the envelope high-wall (44e) by the family of parabolas of the side of scavenging air belt The quadratic function curve shape of line coexists and forms the second scavenging road junction.Or curve is used instead with family of parabolas and logatithmic spiral.Technique The upper top of second scavenging side wall (55d) of butt strip (55) is that have the curve of logatithmic spiral equipotentiality streamline itself and the envelope high-wall The outside of (44e) coexists by the curved shape of the logatithmic spiral equipotentiality streamline of the side of scavenging air belt and forms the second scavenging road junction.Or Curve family of parabolas equipotentiality streamline or family of parabolas and logatithmic spiral adapted.Adapted is: the of the technique butt strip (55) The upper top for sweeping gas side wall (55d) is the outside of the curve of logatithmic spiral equipotentiality streamline itself and the envelope high-wall (44e) by scavenging The curved shape of the logatithmic spiral equipotentiality streamline of the side in road coexists and forms the first scavenging road junction；Meanwhile the technique butt strip (55) the upper top of the second scavenging side wall (55d) is the outer of the quadratic function curve of family of parabolas itself and the envelope high-wall (44e) Side by scavenging air belt side family of parabolas equipotentiality streamline quadratic function curve shape coexistence and formed the second scavenging road junction with Seek the comprehensive guide guiding role to gas storage scavenging.

The two-stroke LPG engine that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise is continuously improved, It is characterized in that: the cylinder body (44) is equipped with multiple reinforcements heat dissipation in flakes (44x, 44v) between its multiple cooling fin；And it is described Cylinder body (44) is equipped with perforation heat release hole (44j) in the cross-sectional direction of exhaust outlet；And in the air inlet of the cylinder body (44) Cross-sectional direction is also equipped with straight-through heat release hole (44k), therefore often there is improvement at the place of ignoring in people.

The present invention relates to energy-saving and emission-reduction, are the two-stroke LPG engines that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, Its cylinder body (44) containing blow vent (44a), into gas port (44b), left and right each pair claim into air scoop (44c), left and right each pair The first scavenging port (44d), each pair second scavenging port (44f) that claims of left and right claimed, the outside of closed envelope high-wall is not i.e. by work Plug cylinder and be curved shape by the side of scavenging air belt, and coexist with the scavenging road junction of cylinder body by external technique butt strip (55), work Skill butt strip (55) stupefied (55g) containing interval, interval notch (55e), the first scavenging side wall (55d), the second scavenging side wall (55d), three A installation hole location and special-shaped packing, and it is formed with the scavenging road junction of cavity, piston (31) is equipped with the gas storage pit of left and right each one (31a).The equipotentiality streamline of family of parabolas and tool logatithmic spiral there is imitative higher mathematics function have fair line and guidance and resistance Damping characteristics are comprehensive, and to noise high frequency band, rate of explosion, compression, when layered scavenging is advantageous.

The two cycle engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, it is characterized in that, the present invention is in work Dead center beyond the Great Wall since piston train of dress portion moves up and makes before the ignition of mixed gas of compressed piston upper in cylinder Preparation air entry in latch-release cylinder is opened, and the gaseous mixture of fuel and air is sucked in the crankcase below piston；And due to The pressure of the burning gases for the piston upper that igniting generates, piston is mobile from top dead-centre to bottom dead centre direction and simultaneously closes off air-breathing Mouthful, the gaseous mixture in compression crankcase makes the burning gases in cylinder from opening and closing exhaust outlet in the piston upper of bottom dead center-nearby To outdoor gas be discharged while, the scavenging access being connected by crankcase with cylinder, in piston upper latch-release cylinder by Gaseous mixture is imported into the two cycle engine in cylinder by preparation scavenging port from crankcase；The design has to be filled with the valve of crankshaft-synchronous It sets, this valve is from crankcase to cylinder scavenging mouth, and the crankcase side of scavenging access is configured to normally closed；In scavenging access When the valve-closing of crankcase side, the gaseous mixture in scavenging access is allowed to burning of igniting by the flame of combustion gas, and HC is reduced Later again from crankcase to scavenging port, the crankcase side of scavenging access is allowed to be open, in the burning mixing pneumatic transmission of scavenging access While out, the gaseous mixture in crankcase closes exhaust outlet before being discharged from exhaust outlet, and here it is keep the discharge of HC significant The two cycle engine of reduction；It solves in pervious structure and the valve of the above-mentioned crankshaft same period is not because being designed, combustion gas If scavenging port is not opened also after the flame extinction of body, the flame of burning gases can make the mixing in scavenging access and crankcase Gas ignition makes gaseous mixture without supplying in normal direction cylinder, and the opening of exhaust outlet will make the opening of scavenging port cross early stage unlatching, cylinder When interior exhaust outlet and scavenging port is open at the same time, the unblended mixture in crankcase and in scavenging access enters from exhaust outlet In cylinder, so a part of gaseous mixture is discharged in the state of unburned from exhaust outlet, become the mixing in discharge gas The problem of gas (i.e. HC) increases；The present invention after crankcase scavenging, is being swept except the air entry exhaust outlet scavenging port The crankcase side of gas access has added opening and closing valve, and the gaseous mixture in scavenging access ignites and burns in the flame of combustion gas, And be in scavenging access and crankcase according to crankshaft and the valve of synchronizing cycle can be truncated, so the gaseous mixture in crankcase is not It can burn, while mixing of the combustion gas in scavenging access when the valve openings with the crankshaft-synchronous period, in crankcase Gas can be extruded out in cylinder, the initial stage when exhaust outlet and scavenging port are open simultaneously, the burning gases in scavenging access It is fed into cylinder, HC will not be adulterated into external discharged exhaust gas from exhaust outlet, when exhaust outlet will close, The unblended mixture continued in crankcase in spent gaseous mixture in scavenging access is fed into cylinder, so exhaust The HC amount adulterated in gas can control reduction.The valve gear having with crankshaft-synchronous is to add crankshaft on crankshaft (57) The c-type circle (56a) of valve (56), the c-type circle have a bit of opening, when a bit of opening of the c-type circle is rotated with crankshaft, and The oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, so that it is double-deck to form equal pressure angle logatithmic spiral runner Cool down the two-stroke LPG engine eliminated the noise.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the outer circle of the c-type circle Gap (56 δ) between the oral area of the connection crankcase in the scavenging channel of cylinder of the outer diameter apart from engine 1E39F is in 0.02- 0.08 millimeter；It is further characterized in that the valve gear having with crankshaft-synchronous, is to add crank valve on crankshaft (57) (56) rotation of c-type circle (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the c-type The central angle in two sides to the crankshaft center of circle of a bit of opening of circle is in 81-95 degree.

Usefulness of the present invention: being the gaseous mixture of compressed piston upper in cylinder near piston top dead center Before igniting, since piston train of dress portion moves up and open the preparation air entry in latch-release cylinder, in the crankcase below piston Suck the gaseous mixture of fuel and air；Its effect is to make to be vented the reduction of HC amount；Add double sieves and scavenging oral area slow in scavenging channel Rush valve.

Design key is that piston is mobile from top dead-centre to bottom dead centre direction and simultaneously close off air entry, i.e. piston length and vapour Port distance matches in cylinder, this, which is contemplated, is just not difficult to mark on the diagram, and processing is not also difficult to apply, and effect is to subtract exhaust HC amount It is few.

The described of the two-stroke LPG engine that the cooling of improved equal pressure angle logatithmic spiral runner bilayer is eliminated the noise has and crankshaft Synchronous valve gear, is on crankshaft (57) plus the c-type circle (56a) of crank valve (56), the c-type circle of the crank valve (56) have The two sides of a bit of opening are set as the inclined wedge circle (56b) at oblique angle, when the side for having oblique angle of the two sides of its a bit of opening While being rotated with crankshaft, just forming shear flow in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and reducing mutation The effect of impact, to form the two-stroke LPG engine of double coarse filtration combination fine filtering buffering valve chamber scavenging pressure reducing valve film.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws The valve gear having with crankshaft-synchronous it is characterized in that, described is held up, is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the outer circle of the c-type circle Gap (56 δ) between the oral area of the connection crankcase in the scavenging channel of cylinder of the outer diameter apart from engine 1E34F is in 0.01- 0.06 millimeter；The valve gear having with crankshaft-synchronous is the c-type circle (56a) for adding crank valve (56) on crankshaft (57) Rotation and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, a bit of opening of the c-type circle The central angle in two sides to the crankshaft center of circle is in 79-97 degree；The valve gear having with crankshaft-synchronous is on crankshaft (57) Add the rotation of the c-type circle (56a) of crank valve (56) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, The crankshaft (57) is equipped with c-type edge (57a), and it is a bit of opening with described plus crank valve (56) the c-type circle (56a) It matches.

The two-stroke LPG that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise is further improved to draw It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and by a positioning Hole or a positioning pin or a positioning sleeve realize cooperation, and fixed with three screws.

The two-stroke LPG that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise is further improved to draw It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, the song The central axes for its every side crankshaft of oblique angle that the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle of axis valve (56) are equipped with Angle in 5-27.5 degree, when the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle have the side at oblique angle with Crankshaft rotation just forms shear flow and slow drop mutation punching in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder The effect hit.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the pressure coil (56f) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, when described The logatithmic spiral side of the two sides of a bit of opening of pressure coil is rotated with crankshaft, the connection in the scavenging channel of latch-release cylinder Pressure angle the logatithmic spiral influence air-flow of properties equivalent and the effect of buffering everywhere are just formed when the oral area of crankcase.

The two-stroke LPG engine that the equal pressure angle logatithmic spiral runner bilayer cooling of brush cutter is eliminated the noise is reformed, there is emission reduction work With strainer (58) is located at beside technique butt strip (55), and separately has strainer (58) to be located under scavenging channel；The filter in scavenging channel Net is to be formed by a plurality of wire of 50 mesh through knitting device, and the strainer in scavenging channel has filtration, is located at scavenging channel Under it is described separately have strainer i.e. sieve and scavenging oral area trimmer valve, double sieve, that is, strainers breathe between gas and crankcase in cylinder There is regulating and controlling effect.It is characterized in that, the innovation is near piston top dead center, compressed piston upper is mixed in cylinder Before closing gas igniting, since piston train of dress portion moves up and open the preparation air entry in latch-release cylinder, the crankshaft below piston The gaseous mixture of sucking fuel and air in case；The pressure of the burning gases of the piston upper generated again due to igniting, piston is from upper Dead point is mobile to bottom dead centre direction and simultaneously closes off air entry, the gaseous mixture in compression crankcase, in the piston of bottom dead center-nearby Above, while the burning gases in cylinder being discharged to outdoor gas from opening and closing exhaust outlet, it is connected by crankcase with cylinder The scavenging access connect, two by preparation scavenging port imported into gaseous mixture from crankcase in piston upper latch-release cylinder in cylinder Stroke motor；The design has the valve gear with crankshaft-synchronous, this valve is the scavenging access from crankcase to cylinder scavenging mouth Crankcase side be configured to it is normally closed；The mixing when valve-closing of the crankcase side of scavenging access, in scavenging access Gas is allowed to burning of igniting by the flame of combustion gas, after HC reduction again from crankcase to scavenging port, the crankcase side of scavenging access It is allowed to be open, while the burning of scavenging access is sent out with gaseous mixture, the gaseous mixture in crankcase is discharged from exhaust outlet Exhaust outlet is closed before, and here it is the two cycle engines for substantially reducing the discharge of HC；It solves in pervious structure, and on The valve of the crankshaft same period is stated because not being designed, if scavenging port is not opened also after the flame extinction of burning gases, combustion gas The flame of body can make the gaseous mixture ignition in scavenging access and crankcase, make gaseous mixture without supplying in normal direction cylinder, exhaust outlet Opening will make the opening of scavenging port cross early stage unlatching, when the exhaust outlet and scavenging port in cylinder are open at the same time, in crankcase And the unblended mixture in scavenging access enters in cylinder from exhaust outlet, so a part of gaseous mixture is in unburned state Under be discharged from exhaust outlet, become discharge gas in gaseous mixture (i.e. HC) increase the problem of；The present invention is in the air-breathing Except mouth exhaust outlet scavenging port, after crankcase scavenging, opening and closing valve, scavenging access have been added in the crankcase side of scavenging access Interior gaseous mixture ignites and burns in the flame of combustion gas, and in scavenging access and crankcase is according to crankshaft synchronizing cycle Valve can be truncated, so the gaseous mixture in crankcase will not burn, while the combustion gas in scavenging access is same with crankshaft When the valve openings of step period, the gaseous mixture in crankcase can be extruded out in cylinder, in exhaust outlet and scavenging port At initial stage when being open simultaneously, the burning gases in scavenging access are fed into cylinder, from exhaust outlet to external discharged row HC will not be adulterated in gas gas, when exhaust outlet will close, continue crankcase in the spent gaseous mixture in scavenging access Interior unblended mixture is fed into cylinder, so the HC amount adulterated in exhaust gas can control reduction；It is described have with The valve gear of crankshaft-synchronous, is on crankshaft (57) plus the c-type circle (56a) of crank valve (56), c-type circle have a bit of opening Two sides be set as the inclined wedge circle (56b) at oblique angle, it is logical in the scavenging of latch-release cylinder when it has the side at oblique angle to rotate with crankshaft Just shearing is formed when the oral area of the connection crankcase in road and reduces the effect of mutation impact；The equal pressure angle logatithmic spiral stream Road bilayer cooling eliminate the noise two-stroke LPG engine, it is further characterized in that, the valve gear having with crankshaft-synchronous, be On crankshaft (57) plus the two sides of a bit of opening of the c-type circle (56a) of crank valve (56) are equipped with the pressure coil (56f) at oblique angle, When the logatithmic spiral side of the two sides of a bit of opening of the pressure coil is rotated with crankshaft, in the scavenging channel of latch-release cylinder Connection crankcase oral area when just form the logatithmic spiral of pressure angle properties equivalent everywhere and influence the effect of air-flow and buffering；It sweeps The wedge (11b) of strainer (58) in gas channel is located at beside the technique butt strip (55)；Beside the technique butt strip (55) Scavenging channel in be equipped with emission reduction catalyst roll up (59), platiniferous rhodium indium iridium, to flow through gas have catalyst effect and noise control filtering adjust Control effect, have the regular hour difference and isolation and noise elimination adjustment effect, slow down exhaust outlet from HC to scavenging channel discharge, from And it is formed in the engine for adding catalyst in scavenging channel；The equal pressure angle logatithmic spiral runner for being further improved perfect brush cutter is double The two-stroke LPG engine that layer cooling is eliminated the noise, which is characterized in that the valve gear having with crankshaft-synchronous is in crankshaft (57) The rotations of upper plus crank valve (56) c-type circles (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed , the scavenging channel of cylinder of the outer diameter of the outer circle of the c-type circle apart from engine 1E45F connection crankcase oral area it Between gap (56 δ) at 0.02-0.07 millimeters；It is further characterized in that the valve gear having with crankshaft-synchronous, be Add the mouth of the rotation of the c-type circle (56a) of crank valve (56) and the connection crankcase in the scavenging channel of latch-release cylinder on crankshaft (57) Portion and formed, the central angle in two sides to the crankshaft center of circle of a bit of opening of the c-type circle is in 82-92 degree.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that it contains the valve gear with crankshaft-synchronous, is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, a bit of of c-type circle is opened The central angle in two sides to the crankshaft center of circle of mouth is in 83-89 degree.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be to be matched with described plus crank valve (56) a bit of opening of c-type circle (56a)；Compression ratio is little In 11.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be to be matched with described plus crank valve (56) a bit of opening of c-type circle (56a).

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) The rotation of (56a) and the oral area of the connection crankcase in the scavenging channel of latch-release cylinder and formed, the crankshaft (57) is equipped with C Type edge (57a) its be corresponding with the described plus a bit of opening of c-type circle (56a) of crank valve (56) and by a positioning Hole or a positioning pin or a positioning sleeve realize cooperation, and fixed with three screws.

It is further improved and the two-stroke LPG of the perfect equal pressure angle logatithmic spiral runner bilayer cooling noise elimination draws It holds up, which is characterized in that the valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle, when described The side for having oblique angle of the two sides of a bit of opening of c-type circle is rotated with crankshaft, the connection in the scavenging channel of latch-release cylinder Shear flow is just formed when the oral area of crankcase and reduces the effect of mutation impact.The two of a bit of opening of inclined wedge circle (56b) The angle of the central axes of its every side crankshaft of the oblique angle that side is equipped with is in 5-27.5 degree；Have and crankshaft it is further characterized in that described Synchronous valve gear is the c-type circle (56a) for adding crank valve (56) on crankshaft (57), the c-type circle of the crank valve (56) There are the two sides of a bit of opening to be set as the pressure coil (56f) at oblique angle, when the two sides of a bit of opening of the pressure coil Logatithmic spiral side rotated with crankshaft, just form pressure angle in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder The logatithmic spiral of properties equivalent influences the effect of air-flow and buffering everywhere；It is further characterized in that the filter in the scavenging channel Net (58) is located at beside the technique butt strip (55), the strainer in the scavenging channel be by a plurality of wire through knitting device and At to breathing has filtering regulating and controlling effect between gas and crankcase in cylinder；The wedge (11b) of noise control strainer in scavenging channel is set Beside the technique butt strip (55), the discharge of exhaust outlet of the ingenious HC for slowing down crankcase virgin gas to scavenging channel.

It is new technology being used on brush cutter and grass trimmer by the analysis of Computer Numerical Simulation blade aerodynamic noise.

The method of computer numerical computer aided simulation aerodynamic noise analysis also on probation, with LMS Virtual lab software, It is easy to learn and use, analyzes noise source, obtain noise data and carry out noise reduction；With the method for computer aided animation aerodynamic analysis, The aerodynamic noise analysis of blade when dallying to the rotation output of engine, with CFD (computational fluid Dynamics it) simulates, method is intended to carry out " numerical experiment " by computer, reappears physical process from point of theory；In the hope of Receive the advantages of cost that has of numerical simulation is low, data are easily obtained, analyzed from point of theory problem compared with experiment with And the effect of development with computer and model, calculating cycle are constantly reduced, and calculated result is more and more accurate；To gardens machine Flow field and field of turbulent flow carry out feasibility analysis and data analysis, determine the blade of gardens machine and mowing runner is sound source, to gardens The noise of machine is simulated, and is met reality as far as possible for the simulation of the trend of noise variation, is made every effort to level of noise and experimental error exists 5% or so；Noise source and eddy current crack are set as fluid matasomatism in turbulent boundary layer and interact between blade and fluid micellar Generate and the disengaging of vortex, continuous spectrum random noise be set as the variation of flow regime to outlet flow pattern modulation and outflow fluid with Ambient atmos effect generates, and rotational noise is set as the fluid of blade drive and stator and surrounding fluid effect generate, experimental data Related with noise spectrum and the display noise energy in different frequency region, mower blade rotary air dynamics noise basis frequency meter is calculated public Formula: F=NZ/60, F are noise fundamental frequency, and N is rotating speed of flail, and Z is blade number；Do progress process: geometrical model is established, and is calculated Machine simulation, compares with experimental result, changes structure and is simulated, establishes noise model, experimental verification according to analog result；Way It is to start with from blade geometry and air duct geometry and rotating speed of flail, establishes air duct and blade CAD model, unstrctured grid ICEM Generate, with FLUENT fluid data calculate rotating machinery in fluid calculation MRF model, consider variable velocity field and pressure field and Tubulence energy obtains noise spectrum with LMS Virtual lab software, analyzes noise source, obtains noise data and carrys out noise reduction；Stable state Tentative calculation parameter setting: grid is 4120000 unstrctured grids and dynamic mesh INTERFACE, and turbulence model is RANS (K- EPSILON), blade rotational speed takes 3000 revs/min, and iterative steps take 1000；The trial result has vorticity figure, pressure cloud atlas, speed arrow Spirogram, three-dimensional motion pattern, pressure contour surface figure and planar flow line chart, there are also blade CAD models to generate non-structural net for the trial result Lattice obtain important computations the result is that engine gardens machine knife speed low noise at 5700-7000 revs/min；It is described a kind of to use computer The gardens of the method for numerical value computer aided simulation aerodynamic noise analysis analyzed by Computer Numerical Simulation aerodynamic noise Its rotating speed of flail of machine is 5790 to 6999 turns per minute, with 1E28 to 1E48F type engine.

It continuously improves and two-stroke LPG engine that the cooling of perfect equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, is to drive Dynamic gardens machine；Fuel gas tank is to contain miniature propane fuel tank, miniature propane fuel tank (t20) with LPG fuel gas tank Front be equipped with pipe screw thread, the fuel is entered engine through mixed airgun controller by pipe fitting and is worked, the miniature propane combustion The front of batch can be additionally provided with safety valve so as to it is in excess of the quota when overflow and rise safety effect；The tank diameter of the miniature propane fuel tank It is then 98 millimeters small, it is replaced containing 465 grams of propane fuel by standard.Strainer in scavenging channel is located at by the technique butt strip Side, and the strainer in the scavenging channel is located under scavenging channel；It is as a plurality of wire through double thick made of knitting device Filter combination fine filtering buffers valve chamber, to breathing has filtering regulating and controlling effect between gas and crankcase in cylinder；A plurality of wire is through knitting device Made of double coarse filtration combination fine filterings buffering valve chambers be additionally provided with the catalyst volume of emission reduction, platiniferous, rhodium, indium have catalyst to gas is flowed through Effect slows down pneumatic noise and the discharge of HC.The two-stroke LPG engine that the cooling of equal pressure angle logatithmic spiral runner bilayer is eliminated the noise, Be characterized in: the muffler ASSY (F7) of the hush tube containing catalyst (69) is mounted on described by the silencer pad (F8) On two-stroke LPG engine, the exit of the muffler ASSY (F7) is nearby equipped with the inner outlet of interior metal cap (F7C1) (F7C2), then it is outer, it is equipped with the outer vent (F7j2) and logarithm runner (F7j3) of outer resin cover (F7j1), at a distance convenient for the double-deck drop Temperature is eliminated the noise, and manpower and security are not scalded.

It continuously improves and two cycle engine that the perfect equal pressure angle logatithmic spiral runner bilayer cooling is eliminated the noise, It is characterized in that, the valve gear having with crankshaft-synchronous, is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the inclined wedge circle (56b) that the c-type circle of the crank valve (56) has the two sides of a bit of opening to be set as oblique angle are described The axis at oblique angle and every side crankshaft that the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle of crank valve (56) are equipped with The angle of line is in 15-27 degree, when the side for having oblique angle of the two sides of a bit of opening of the inclined wedge circle (56b) of the c-type circle It is rotated with crankshaft, in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder, just forms shear flow and slow drop mutation The effect of impact.

A kind of engine of improved further noise reduction is additionally provided with strainer i.e. sieve and scavenging oral area in scavenging beneath galleries Trimmer valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed is set as per minute 6300 switch to it is good；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately there is strainer (58) to be located under scavenging channel It is the fie screen of 180 mesh；The catalyst that a plurality of wire is equipped with emission reduction by strainer made of knitting device rolls up (59), platiniferous, rhodium, Indium and rare earth element have catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, and It is to first pass through the hush tube containing catalyst (69), then by function hush tube (54d), assist the tubule of hush tube (54g), fish Squama wedge (54e), variable cross-section air hose (54f) noise reduction, then again by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population Discharge indirectly；There are regular hour delay difference and isolation and noise elimination and obstructs adjustment effect, it is ingenious to slow down pneumatic noise and HC Discharge；The engine of a kind of further noise reduction, which is characterized in that it contains silica gel damping pad (54a), function hush tube (54d), the tubule for assisting hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f)；The cylinder of the engine The exhaust outlet connection hush tube containing catalyst (69), then by function hush tube (54d), auxiliary hush tube (54g) tubule, Fish scale wedge (54e), variable cross-section air hose (54f) noise reduction；The hush tube containing catalyst (69) of the exhaust outlet connection of cylinder block (g44) Outgassing direction side is equipped with the silica gel damping pad (54a) and the variable cross-section air hose (54f) equipped with series winding；The variable cross-section The inside of air hose (54f) is equipped with the function hush tube (54d)；The function hush tube (54d) is the series winding at interval, And the song of the range of decrease along the approximate similar odd function with reference to multiple limited sinusoidal wave trains that one third octave is the period Line is axis；Multiple function hush tube (54d) groups are combined into the length and caliber of each hush tube of multistage noise elimination It all changes, sees that the length of each hush tube is shortened in single file and caliber has step by step toward outgassing direction from front to back It is reduced；Each hush tube that multiple function hush tube (54d) groups are combined into multistage noise elimination is equipped with multiple described Fish scale wedge (54e) and the wedge (50d) for having through-hole；The fish scale wedge (54e) is equipped with the small slot of arc and has through-hole Wedge (50d)；The auxiliary hush tube (54g) of the collateral branch of auxiliary is additionally provided on the function hush tube (54d)；Described is auxiliary Helping hush tube (54g) is tubule, and the tubule has the wedge (50d) of through-hole；The variable cross-section air hose (54f) is to become to cut Face, be at least three swell and have at three be reduce；The variable cross-section air hose (54f) be it is curved, at least There is turn at three；The main rotating shaft line for blowing paddle wheel fan and the main rotating shaft line of the Wind Volume turbine (54c) have angle With regard to hindering outflow of the main noise of noise along straight central axes directly forwardly and rearwardly；What the Wind Volume turbine (54c) came out The first function hush tube (54d) and the hush tube that the inside that blowing enters the variable cross-section air hose (54f) is equipped with The small slot of arc and have the first quilt of the wedge (50d) of through-hole that the multiple fish scale wedges (54e) being equipped with are equipped with Compression comes out again and expands first order noise elimination process of just completing, the side for the auxiliary that the function hush tube (54d) is equipped with The tubule of the auxiliary hush tube (54g) of branch is to provide some outlets for air-flow more and all not mixing away from supervisor further to mention High noise elimination effect；The variable cross-section air hose (54f) is variable cross-section, and air-flow is from swollen portion bit stream to diminution position to compression-expansion There is booster action；The variable cross-section air hose (54f) is that curved have turn to have booster action to preventing main noise from directly spreading out of；It is complete At the air-flow of first order noise elimination process come out from first function hush tube (54d), in rising for variable cross-section air hose (54f) It is expanded in big cavity, and through bend, the second function hush tube (54d) all changed subsequently into length and caliber is simultaneously passed through Being compressed again for the small slot of arc and the wedge (50d) that has through-hole of auxiliary hush tube (54g) and fish scale wedge (54e) is swollen It is swollen and complete the second level have make an uproar frequency variation noise elimination process；Complete second level noise elimination process from second function hush tube The air-flow that (54d) comes out, expands, and through bend in the cavity of the swell of the variable cross-section air hose (54f), subsequently into length And the third function hush tube (54d) that all changes of caliber and through the auxiliary hush tube (54g) and fish scale wedge (54e) The small slot of arc and have through-hole wedge (50d) compression-expansion and after completing third level noise elimination process, from the air port of diminution Noise abatement is blown out, is then discharged indirectly by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again.

Bright spot: a kind of engine of further noise reduction is additionally provided with strainer i.e. sieve and scavenging oral area in scavenging beneath galleries Trimmer valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed is set as per minute 6300 switch to it is good；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately there is strainer (58) to be located under scavenging channel It is the fie screen of 180 mesh；The catalyst that a plurality of wire is equipped with emission reduction by strainer made of knitting device rolls up (59), platiniferous, rhodium, Indium and rare earth element have catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, and It is to first pass through catalyst hush tube (69), then by function hush tube (54d), assist the tubule of hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f) noise reduction.

Claims

1. a kind of engine of further noise reduction, if variable cross-section air hose (54f) noise reduction；For brush cutter, containing stock, cutter, Manipulating handgrip assembly, the stock contain aluminum pipe, are equipped with transmission shaft, the aluminum pipe in the cavity being equipped with inside the aluminum pipe And transmission shaft the upper end is equipped with engine, that is, engine, the aluminum pipe and its lower end of transmission shaft are installed with the cutter, described Hand handle is installed in the middle part of aluminum pipe；The brush cutter its contain the two-stroke LPG engine, that is, engine (1), interior hexagonal cylindrical head Screw M6x30 (2), hexagon socket cap head screw M5x8 (3), 31 type hex nut M6 (4), PP wire clamp (5), PA hanging ring (6), 41 type non-metallic insert hexagonal locking nut M5 (7), POM hanging ring fixing seat (8), hexagon socket cap head screw M5x20 (9), Before connect aluminum pipe (10), manipulating handgrip assembly (11), control handle pipe (12), 13 band spring washer hexagon socket cap head screw M5x25 (13), hand handle fixing seat upper clamp plate (14), hand handle fixing seat (15), left handgrip component (16), nitrile rubber hand handle shock-absorbing sleeve (17), hand handle fixing seat lower clamp plate (18), left handgrip pipe (19), five leaf nylon tubes(20), transmission shaft (21), deep groove ball bearing III (22), spring washer 6 (23), hexagon socket cap head screw M6x23 (24), aluminium tube joint (25), locking Knob (26), shaft adapter (27), rear aluminum pipe(28), 4 hexagon socket cap head screw M5x12 (29), 4 Spring washer 5 (30), limit handle spring (31), limit handle lock (32), limit handle (33), split washer 2.5 (34), Shield fixing seat (35), circlip for hole 26 (36), circlip for shaft 10 (37), roundlet gear with curved teeth (38), small arc-shaped Gear oil block up (39), hexagon socket cap head screw M6x14 (40), hexagon socket cap head screw M6x10 (41), plain washer 6 (42), Gear-box (43), great circle gear with curved teeth (44), splined shaft (45), 6002 I of deep groove ball bearing (46), circlip for hole 32 (47), Gear-box shield (48), spline pad (49), disc cutterbar are containing 3 tooth disc cutterbars (50) or 2 tooth disc cutterbars (63) or 4 tooth disc cutterbars (64) Or 8 tooth disc cutterbars (65), cutterhead pressing plate (51), cutterhead shield (52), 1 type hex nut M10 left-handed (53) or nylon moving head (54), harness (55), hexagon nut with flange M5 (56), small blade (57), knife rest (58), cross recessed pan head tapping screw ST4x14 (59), shield A (60), shielding support (61), hexagon socket cap head screw M5x35 (62), left handgrip (16-1), 1 type hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4), have The waistband (66) of pallet (67), auxiliary turn ball (68), catalyst hush tube (69)；The engine (1), with single cylinder, cylinder diameter 28- 46mm, air-cooled, assembly containing starter (F1), starting driver plate component (F2), 2 oil sealings (F3), right case (F4), 2 zanjons Hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6), hush tube containing catalyst (69) in ball bearing II (F5), 2 torque 7-9NM Muffler ASSY (F7), silencer pad (F8), the right shock-reducing sleeve of fuel tank (F9), 2 retaining ring for piston pins (F10), piston pins (F11), needle bearing (F12), piston (F13), piston ring (F14), crank assemblby (F15), woodruff key (F16), cylinder block pad (F17), cylinder block (F18), 2 interior hexagonal cylindrical head screw assemblies M5 × 20 (F19), engine enclosures (F20), coiled hair self tapping Screw ST5 × 14 (F21), igniter assembly (F22), 2 crosses fluting screw assemblies M4 × 20 (F23), spark plug (F24), No asbestos packing sheet mould assembling pad (F25), 2 mould assembling positioning pins (F26), left box body (F27), 5 crosses fluting screw assemblies M5 × 25 (F28), magnetic flywheel (F29), clutch assembly (F30), clutch disk (F31), circlip for shaft (F32), fuel tank are left The right shock-absorbing sleeve R (F34) of shock-absorbing sleeve L (F33), fuel tank, inserts bearing connection seat (F35), 3 crosses fluting screw assemblies M5 × 20 (F36), upper clamp plate shock-absorbing sleeve (F37), lower clamp plate shock-absorbing sleeve (F38), upper clamp plate (F39), lower clamp plate (F40), 2 interior hexagonal circles Column cap screw assemblies M5 × 18 (F41), flame-out wire clamp (F42), air filter seat (F43), 2 air filter seat pad sets (F44), soft Polyurethane foam filter core (F45), air filter pressing plate (F46), 2 M5 spring washers (F47), 2 crosses fluting coiled hair bullet screw M5 × 63 (F48), air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50), 2 air inlet pipe pads (F51), deflectors (F52), polyphenylene sulfide PPS air inlet pipe (F53), grounding wire component (F54), total without asbestos packing sheet carburetor packing (F55), carburetor At (F56), PU yellow transparent oil return pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel oil Cleaner assembly (F60), oil pipe clip (F61), HDPE are blow molded fuel tank (F62), cap assembly of fuel tank (F63), 5-7NM hexagon-headed bolt Plain cushion combines M6X14 (F64), 4 3-5NM crosses fluting screw assemblies M5X18 (F65), the brush cutter its included Two cycle engine passes through the hexagon socket cap head screw M6x30 (2), hexagon socket cap head screw M5x8 (3) and 31 Type hex nut M6 (4), with it is described before connect aluminum pipe (10) and be connected；The outside that the pipe of aluminum pipe (10) is connect before described, by institute It is the PP wire clamp (5) stated, PA hanging ring (6), 41 type non-metallic insert hexagonal locking nut M5 (7), POM hanging ring fixing seat (8), interior Hexagonal cylindrical head screw M5x20 (9) simultaneously forms harness portion with harness (55), so that harness is worn in single shoulder；Described Before connect on aluminum pipe (10), be installed with manipulating handgrip assembly (11), be by control handle pipe (12), more band spring washers in hexagonal cylindrical Head screw M5x25 (13), hand handle fixing seat upper clamp plate (14), hand handle fixing seat (15), left handgrip component (16), nitrile rubber hand Shock-absorbing sleeve (17), hand handle fixing seat lower clamp plate (18), left handgrip pipe (19) are collectively constituted；Aluminum pipe is connect before described (10) inside of pipe is installed with the five leaf nylon tubes(20), transmission shaft(21) and deep-groove ball Bearing I II (22) is to be driven；Aluminum pipe (10) are connect before described passes through the spring washer 6 (23), hexagon socket cap head screw M6x23 (24), it aluminium tube joint (25), locking knob (26), shaft adapter (27), connect with the rear aluminum pipe (28), and Pass through 4 hexagon socket cap head screw M5x12 (29), 4 spring washers 5 (30), limit handle spring (31), limit handle lock (32), limit handle (33), split washer 2.5 (34) and form limit Handleset；In the end of the rear aluminum pipe (28), It is installed with the shield fixing seat (35), circlip for hole 26 (36), circlip for shaft 10 (37), roundlet gear with curved teeth (38), small arc-shaped gear oil blocks up (39) and more bands spring washer hexagon socket cap head screw M5x25 (13), interior hexagonal cylindrical head spiral shell Follow closely M6x14 (40), hexagon socket cap head screw M6x10 (41), plain washer 6 (42) and gear-box (43), great circle gear with curved teeth (44), splined shaft (45), deep groove ball bearing 6002 (46), circlip for hole 32 (47), gear-box shield (48), spline pad (49), 3 tooth disc cutterbars (50), cutterhead pressing plate (51), cutterhead shield (52)；The cutter containing shield and moving head and Disc cutterbar is to select；It is left-handed (53) with the 1 type hex nut M10 to fill cutterhead；Or dress nylon moving head (54) is with generation For disc cutterbar, and cutting is beaten the grass the small blade (57) of line, passes through hexagon nut with flange M5 (56), knife rest (58), cross recessed pan head tapping screw ST4x14 (59) is on the shield A (60), and to install shielding support (61) and hexagon socket cap head screw M5x35 (62)；Cutterhead can multiselect or 2 tooth disc cutterbars (63) or 4 tooth disc cutterbars (64), or 8 tooth disc cutterbars (65), to select the shrub for cutting different cultivars；The left handgrip component (16), by left handgrip (16-1), 1 type Hex-head nut M5 (16-2), Cross Recess Head Screw M5x20 (16-3), Cross Recess Head Screw M5x30 (16-4) are formed, It is mounted on left handgrip pipe (19)；And have the waistband (66) of pallet (67), people's waist can be tied up to, pallet (67) and auxiliary turn ball (68) movable contact, auxiliary turns ball (68) and connect with engine enclosure (F20), further to lengthen cut coverage；Catalyst disappears Sound pipe (69) connects the gas outlet of muffler ASSY (F7), so that exhaust gas is discharged near cutter through aluminum pipe；Two punchings The engine start part of journey engine includes starter assembly (F1), starting driver plate component (F2), is furnished with 2 oil sealings (F3) and 2 Deep groove ball bearing II (F5), to be rotationally mounted on the right case (F4) of engine；By in 2 torque 7-9NM Hexagonal cylindrical head plain cushion screw assemblies M5 × 45 (F6), the muffler ASSY (F7) and silencer of hush tube containing catalyst (69) It pads (F8), is fixed on cylinder block (F18)；The right shock-reducing sleeve of fuel tank (F9) is housed on cylinder block (F18)；At cylinder block (F18) It is provided with 2 retaining ring for piston pins (F10), piston pin (F11), needle bearing (F12), piston (F13), piston ring (F14) and song Axle assembly (F15) sets woodruff key (F16) on crankshaft；Cylinder block pad (F17) is mounted on cylinder block (F18)；2 interior hexagonal circles Engine enclosure (F20) is fixed on cylinder by column cap screw assemblies M5 × 20 (F19) and recessed pan head tapping screw ST5 × 14 (F21) On body (F18)；Igniter assembly (F22) is fixed by 2 cross flutings screw assemblies M4 × 20 (F23)；Spark plug (F24) is also On cylinder block (F18)；No asbestos packing sheet mould assembling pad (F25), 2 mould assembling positioning pins are put on cylinder block (F18) (F26), and it is fixed left box body (F27) with 5 cross flutings screw assemblies M5 × 25 (F28)；Magnetic flywheel (F29) is mounted in crankshaft On, and matched with clutch assembly (F30), clutch disk (F31) and circlip for shaft (F32)；The left shock-absorbing sleeve L of fuel tank (F33) and the right shock-absorbing sleeve R (F34) of fuel tank is on the outer cover (20)；Inserts bearing connection seat (F35) passes through 3 crosses Screw assemblies M5 × 20 (F36) is slotted to fix；Upper clamp plate shock-absorbing sleeve (F37), lower folder are housed on the connection seat (F35) Plate shock-absorbing sleeve (F38) and upper clamp plate (F39) lower clamp plate (F40) and with 2 interior hexagonal cylindrical head screw assemblies M5 × 18 (F41) it clamps；Flame-out wire clamp (F42) is also equipped on the connection seat (F35)；Air filter seat (F43), 2 air filters Seat pad set (F44), soft polyurethane foam filter core (F45), air filter pressing plate (F46) pass through 2 M5 spring washers (F47) and 2 ten Word is slotted coiled hair bullet screw M5 × 63 (F48) air filter lid (F49), cross fluting coiled hair screw assemblies M5 × 14 (F50) forms Air filter, and be packed on carburetor；2 air inlet pipe pads (F51), polyphenylene sulfide PPS air inlet pipe (F53), connect deflector (F52) Ground wire component (F54) forms carburetor without asbestos packing sheet carburetor packing (F55), carburetor assembly (F56)；PU yellow transparent Oil return pipe (F57), PU black oil inlet pipe (F58), oil-resistant acrylonitrile-butadirubber rubber oil pipe seat (F59), fuel filter assembly (F60), oil Pipe clamp (F61), HDPE blow molding fuel tank (F62), cap assembly of fuel tank (F63) form fuel tank；And 5-7NM hexagon-headed bolt plain cushion combines M6X14 (F64) is the fixed starting driver plate component (F2), as 4 3-5NM crosses fluting screw assemblies M5X18 It (F65) is that the fixed starter assembly (F1) is used；The waistband (66) for having pallet (67) is equipped with pallet (67), auxiliary can be placed on pallet (67) to turn ball (68), and assist turning ball (68) mounted in external engine, or directly by brush Machine engine is placed on the pallet (67) that waistband (66) is equipped with and comes up operation；Pallet (67) and auxiliary turn ball (68) movable contact, Auxiliary turns ball (68) and connect with engine enclosure (F20), further to lengthen cut coverage；Catalyst hush tube (69), one Terminate the gas outlet of logical muffler ASSY (F7), connect aluminum pipe before another termination, so as to exhaust gas after described aluminum pipe, and from cutter Discharge nearby；The catalyst hush tube (69) is aluminum, has exhaust gas by there is aluminium dioxide catalyst effect；Described disappears Sound device assembly (F7) is aluminum, has exhaust gas by just there is aluminium dioxide catalyst effect；Aluminum pipe (10) and rear aluminium are connect before described Pipe (28) be it is separated, have exhaust gas by there is aluminium dioxide catalyst effect；The five leaf nylon tubes in the rear aluminum pipe are set Foam honeycomb body, and add catalyst catalyst in foam honeycomb body, there is catalyst multiple catalyzing effect when to there is exhaust gas to pass through；It is described 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 tooth disc cutterbars (65) for select, the disc cutterbar of cutter is commonly referred to as, in knife Disk periphery is equipped with multiple outer cutting edges (641), so that brush allows knife less；The 2 tooth disc cutterbars (63), 4 tooth disc cutterbars (64), 8 Tooth disc cutterbar (65) is equipped with multiple inner cutter holes (642) in cutterhead periphery, so as to card branch in brush not；In the carburetor In assembly (F56), the interior straight tube (70) for improving atomizer is the vortex spray bar for having helicla flute (71), in favor of diverging mixing effect Fruit；In the carburetor assembly (F56), improves the interior straight tube (70) of atomizer or have the vortex spray bar of helicla flute (71) Import be the horn mouth for having parabolical horn mouth (72) or conical section such as archimedes curve, in favor of polymerization Contaminated product effect；On the left handgrip pipe (19), (19b) is taken in the damping equipped with close circle helical spring shape, so as to further Damping；Using there are transparent or partially transparent shield (60), operated with the more convenient observation brush of benefit；This brush cutter uses The two cycle engine eliminated the noise of small two-stroke single-cylinder air-cooled equal pressure angle logatithmic spiral runner bilayer cooling, belong to low emission Engine, be the improvement of internal combustion engine the combustion chamber for having function wave and with the internal combustion engine that has active receiving electrode and fine motion discharge electrode Add the petrol engine of double auxiliary skirt rims reduction hydrocarbon emission on the basis of the collocation of igniter, and in piston skirt On the basis of, and the petrol engine basis for altering drop row is gone back in improved piston skirt logarithmic differentiation isogonal line skirt turbulent flow On, double auxiliary blow vents of further improved narrowed left and right block reduce the two of discharge and rush petrol engine；In piston skirt plus Double auxiliary skirt rims have the effect that emission reduction is up to standard；Piston skirt logarithmic differentiation isogonal line skirt turbulent flow returns the petrol engine for altering drop row It is to be equipped with double auxiliary skirt rims (g37) in the skirt section of piston (g31)；The double auxiliary skirt rims (g37) are to retain original piston On the basis of not having two skirt of original of the bilateral of connecting rod pin hole, and under the bilateral for having connecting rod pin hole in the skirt section of piston (g31) Side, every one side also add an auxiliary skirt, become double auxiliary skirt rims (g37)；The double auxiliary skirt rims, containing bottom edge (g38), under Fillet (g39), side (g40), upper fillet (g41), the concave arc side (g42) on bottom edge, piston double auxiliary skirt rims through-hole (g43), Isogonal one section of piston skirt logarithmic differentiation equation is located at skirt, be conducive to auxiliary guiding, additional turbulence return alter and Drop row and lubrication assistant and heat dissipation；The double auxiliary skirt rims or with aluminium alloy, or with composite material to reduce cylinder prepareding gap； Each auxiliary skirt of the double auxiliary skirt rims (g37) and two skirt of original are the cylindrical bodies along outside piston week Extend, and it is along the outside piston week quartering that its projection, which is thrown on the face vertical with piston motion direction,；Double auxiliary skirts Each auxiliary skirt on side (g37) is extended longer along the cylindrical body in outside piston week than two skirt of original, that is, It says, the bottom edge of former two skirts of bottom edge (g38) ratio of double auxiliary skirt rims is on the direction along the cylindrical body extended line of piston apart from connecting rod Pin hole is farther, i.e., double auxiliary skirt rims are higher, and piston and skirt section are longer, and effect is to be conducive to the guiding length of lengthened piston and assist Guiding；The two sides of the double auxiliary skirt rims (g37) are equipped with the side (g40) of double auxiliary skirt rims, connect piston (31) and double auxiliary skirts The bottom edge (g38) on side；The two sides of the double auxiliary skirt rims (g37) are equipped with the bottom edge (g38) of connection piston (31) and double auxiliary skirt rims Double auxiliary skirt rims side (g40), the angle of the side (g40) of two sides is greater than 100 degree；The two of the double auxiliary skirt rims (37) Side is equipped with the side (g40) of double auxiliary skirt rims, is that piston (g31) is connected by the upper fillet (g41) of the side of double auxiliary skirt rims 's；The two sides of the double auxiliary skirt rims (g37) are equipped with the side (g40) of double auxiliary skirt rims, are the sides by double auxiliary skirt rims Lower fillet (g39) connects the bottom edges (g38) of double auxiliary skirt rims；Concave arc side is set on the bottom edge of the double auxiliary skirt rims (g37) (g42)；The concave arc side (g42) or circular arc or involute or parabola assist drop row with benefit；Described is double auxiliary Through-hole (g43) or pit are set on skirt (g37), with sharp lubrication assistant and heat dissipation；In the double auxiliary skirt rims (g37) and piston It being equipped with multiple through-holes (g43), is slightly in up-side down triangle arrangement, has multiple rows of, most downlink through-hole is few, and it is more more toward uplink through-hole, With sharp lubrication assistant and heat dissipation；Cylinder body (g44) be two rush petrol engine on the cylinder chamber of dress piston along symmetrically The cylinder body (g44) at the scavenging road junction (g45) containing left and right each one, in sweeping for the symmetrical left and right each one of the cylinder body (g44) Symmetrically each ground in left and right is equipped with inclined wedge turbulent flow time and alters piece (g46) on gas port (g45), and the logatithmic spiral of higher mathematics is utilized to have The equal feature of pressure angle returns the inclined wedge turbulent flow and alters one section of the logatithmic spiral that piece has by logarithmic differentiation equation, then gushes Mixed air-flow on it is just easily steady, generates turbulent flow using equal pressure angle at scavenging road junction with benefit to block exhaust gas time and alter to drop Low emission；Lower dead center is closed in the bottom that the inclined wedge turbulent flow returns the bottom for altering the scavenging road junction (g45) that piece (g46) is located at cylinder The scavenging air belt close to piston outlet side, tool one section of logatithmic spiral；The inclined wedge turbulent flow, which returns, alters piece (46) packet Turbulent flow containing inclined wedge returns and alters the scavenging road junction (g47) of piece, inclined wedge turbulent flow return the logical scavenging road junction for altering piece inclined wedge (g48), inclined wedge it is disorderly Flow back to the logical scavenging road junction for altering piece returns the turbulent shield (g50) for altering the logical scavenging road junction that grid (g49), inclined wedge turbulent flow go back to alter piece, Has one section of logatithmic spiral；The inclined wedge turbulent flow, which returns, alters piece (g46) slightly in inclined wedge-shaped, and the big end of the inclined wedge-shaped is connected to The side of the outlet of the scavenging air belt close to piston for closing on lower dead center of the bottom of the bottom at the scavenging road junction (g45) of cylinder body, It has one section of logatithmic spiral；The inclined wedge turbulent flow, which returns, alters the scavenging road junction that the inclined wedge turbulent flow go back to that piece (g46) is included alters piece (g47) it is located at the inclined wedge turbulent flow and goes back to the top for altering piece (46), that is to say, that return the inclined wedge-shaped for altering piece (g46) in inclined wedge turbulent flow Small end its have one section of logatithmic spiral；The inclined wedge turbulent flow time is altered the inclined wedge turbulent flow time that piece (g46) is included and is altered The inclined wedge (g48) at the logical scavenging road junction of piece is located at inclined wedge turbulent flow and goes back to the inside for altering piece (g46) and the scavenging road junction (g45) with cylinder body Bottom bottom connection, the inside its have one section of logatithmic spiral；The inclined wedge turbulent flow time is altered piece (g46) and is wrapped The inclined wedge turbulent flow contained returns returning to alter grid (g49) and be located at inclined wedge turbulent flow and return and altering sweeping for piece and cylinder body for the logical scavenging road junction for altering piece The intersection of the side of the outlet of the scavenging air belt of gas port (g45), one section of tool logatithmic spiral；The inclined wedge turbulent flow is returned and is altered The inclined wedge turbulent flow that piece (46) is included return alter piece logical scavenging road junction return alter grid (g49) be located at inclined wedge turbulent flow return alter piece At the chamfering of the side of the outlet of the scavenging air belt at the scavenging road junction (g45) of cylinder body, one section of tool logatithmic spiral；Described is oblique Wedge turbulent flow returns to alter the inclined wedge turbulent flow that piece (g46) is included and return returning for the logical scavenging road junction for altering piece and alters grid (g49) and be located at tiltedly Wedge turbulent flow returns at the rounded corner for the side of the outlet of the scavenging air belt at scavenging road junction (g45) for altering piece and cylinder body, has logatithmic spiral One section；The inclined wedge turbulent flow returns the turbulent shield for altering the logical scavenging road junction that the upper surface of piece (g46) alters piece equipped with inclined wedge turbulent flow time (g50), one end is altered the side of outlet of the scavenging air belt at scavenging road junction (g45) of piece and cylinder body and is intersected with being located at inclined wedge turbulent flow and return Chamfering at be connected, and its other end and inclined wedge turbulent flow return and alter the top of piece and that is return with inclined wedge turbulent flow and alter piece (g46) The small end of inclined wedge-shaped is connected；And the upper surface of described turbulent shield its also have one section of logatithmic spiral；Narrow the double auxiliary of left and right block Blow vent reduces by two discharged and rushes petrol engine, containing left block, right block, piston and combustion chamber, spark plug, cylinder body, cylinder Lid, cylinder barrel, connecting rod, crankcase, lubricating oil pump, lubricating system, fuel system, ignition system, cooling system, the cylinder body It (g44) is two scavenging road junctions of the edge symmetrically containing left and right each one on the cylinder chamber of dress piston for rushing petrol engine (g45) cylinder body (44), it is respectively symmetrically left on the scavenging road junction (g45) of the symmetrical left and right each one of the cylinder body (g44) Right each ground is equipped with inclined wedge turbulent flow time and alters piece (g46)；The skirt section of the piston is equipped with double auxiliary skirt rims (g37)；Described is double Auxiliary skirt (g37) is on the basis of retaining former two skirt of the bilateral for there be not connecting rod pin hole of original piston, and at piston (g31) Skirt section the bilateral for having connecting rod pin hole it is following, it is every to add an auxiliary skirt on one side, become double auxiliary skirt rims (g37)；It is described Double auxiliary skirt rims, containing bottom edge (g38), lower fillet (g39), side (g40), upper fillet (g41), bottom edge concave arc side (g42), The logarithm line of the through-hole (g43) of piston and double auxiliary skirt rims, its piston skirt of piston logarithmic differentiation equation is also referred to as isogonism One section of line is located at skirt, and the side of the part of skirt is pressure angle close to the one of the equal logatithmic spiral by logarithmic differentiation equation Section returns the inclined wedge turbulent flow and alters piece (46) and have pair using the equal feature of logatithmic spiral tool pressure angle of higher mathematics One Duan Yili of number helical is blocked exhaust gas time using equal pressure angle generation turbulent flow at scavenging road junction and altered to reduce discharge；Institute The double auxiliary skirt rims stated or with aluminium alloy, or with composite material to reduce cylinder prepareding gap；With CNC machining center, tungsten is first produced Copper electrode assists molding with the lathe for having three-dimensional rotation head, then is produced in batches with die casting machine；It machines and is electroplated again；Described Left block and its left block of right block and right block, which are respectively provided with, changes the small double auxiliary blow vents to narrow, and double auxiliary blow vents are located at Left block is just left double auxiliary blow vents (51b), and it is right double auxiliary blow vents (52b) that double auxiliary blow vents, which are located at right block just, The left block and right block are to assemble Face to face, and be connected with the upper surface of the scavenging air belt of cylinder body, the cylinder body The double auxiliary blow vents (51b) in a left side and the right block (g52) that two scavenging air belts are equipped with the left block (g51) respectively set Some right double auxiliary blow vents (52b) are connected, and are double auxiliary blow vents of narrowed left and right block, when double auxiliary blow vents When the double auxiliary skirt rims (g37) being equipped with the skirt section for running to plug near piston lower dead center are close, just it is conducive to narrow local volumetric, Increase local air flow pressure and flow velocity and additional turbulence returns and alters and drop row；Double auxiliary blow vents of the narrowed left and right block and institute Each inclined wedge that symmetrically each ground in left and right is equipped with is disorderly on the scavenging road junction (g45) of the symmetrical left and right each one for the cylinder body (g44) stated It flows back to and alters both pieces (g46) adapted, there is drop row's effect；Double auxiliary blow vents and the piston of the narrowed left and right block Both double auxiliary skirt rims (g37) that skirt section is equipped with adapted has drop row's effect；Double auxiliary blow vents of the narrowed left and right block, It is equipped with the symmetrically each ground in left and right each on the scavenging road junction (g45) of the symmetrical left and right each one of the cylinder body (g44) oblique Wedge turbulent flow is returned and is altered piece (g46), and with double auxiliary skirt rims (g37) three's adapted that the skirt section of the piston is equipped with, have more Drop arrange effect；The double auxiliary ventilations in a left side that the left block (g51) of double auxiliary blow vents of the narrowed left and right block is equipped with The rear wall (51f) of mouth (51b) is thicker, and thinnest part is no less than 2mm, and has the oblique angle greater than 10 degree, increases so that root is thicker Intensity；The left block (g51) of double auxiliary blow vents of the narrowed left and right block is equipped with 4 reinforcement arm pawls (51e), and The rectangular section of each reinforcement arm pawl is thicker, and thinnest part is also no less than 2mm, increases intensity so that section is thicker；The receipts Near the back side for the double auxiliary blow vents (51b) in a left side that the left block (g51) of double auxiliary blow vents of narrow left and right block is equipped with Equipped with long reinforcing rib (51c), so as to the local pressure for increasing intensity to resist bigger caused by narrowing double auxiliary blow vents；Described The back of the pit for the double auxiliary blow vents (51b) in a left side that the left block (g51) of double auxiliary blow vents of narrowed left and right block is equipped with It is equipped with short reinforcing rib (51d) near face, so as to the part pressure for increasing intensity to resist bigger caused by narrowing double auxiliary blow vents Power；The double auxiliary blow vents (52b) in the right side that the right block (g52) of double auxiliary blow vents of the narrowed left and right block is equipped with are Pit, a left side double auxiliary blow vent (51b) that the length, width and height of pit are about equipped with the left block (g51) is identical, to increase Reinforcement degree resists local pressure bigger caused by narrowing double auxiliary blow vents；Double auxiliary blow vents of the narrowed left and right block The double auxiliary blow vents (52b) in the right side that are equipped with of the right block (g52) be pit, the length, width and height of pit and the left block (g51) the double auxiliary blow vents (51b) in the left side being equipped with are identical, and the length and width on engine are a height of to be not more than 19x7x4.8mm, with convenient Narrowed local volumetric, increases local air flow pressure and flow velocity and additional turbulence returns and alters and drop row；The exhaust gas of engine is not arranged directly It puts, but by being discharged indirectly after one meter five of catalyst hush tube from the nearly tool bore (28a) of aluminum pipe；The cutter, which contains, to be had Cut pile beat the grass wire (54b) moving head (54) with the long-acting cutting of benefit, and the disc cutterbar (64) with inner sawtooth (642) to prevent Allow knife；And the carburetor of its engine sets four bifurcated nozzles (70a) with benefit atomization；And the cutter is equipped with mounted in interior Outer protective cover (73) on shield (60) and the long grass pressing wheel on its outer protective cover equipped with its roller length equal to diameter of beating the grass (74), in order to press grass soil moisture conservation and meadow decorative pattern；The pile of cutting that moving head (54) contained by the cutter is had is beaten the grass Way of the wire (54b) equipped with its multiple sharp sword of multiple sharp swords (54a) is to be hammered on wire with sharp plain chisel Under cut what pile went out, and the wire is round；The pile of cutting that moving head (54) contained by the cutter is had is beaten the grass Wire (54b) is equipped with multiple sharp swords (54a), the way of multiple point swords or on wire with the formed punch for having sharp edge Mold cuts what pile went out under the impact of press machine, and the wire is flat；Contained by the cutter with inner saw The outer cutting edge (641) of the periphery of the knife for 4 stretchings that the disc cutterbar (64) of tooth (642) is equipped with is equipped with multiple outer sawtooth (64a), and the inner sawtooth (642) also has 4, and its every inner sawtooth (642) sets multiple sawtooth；The cutting The outer protective cover (73) installed on interior shield (60) set by device is equipped with installation card slot (73b) and 2 screw hole locations (73a) Limit (73c) with benefit installation, and equipped with rope of beating the grass on its outer protective cover (73), and be equipped with and use on its outer protective cover (73) In the grass pressing wheel mounting bar (73d) and arc enclosing item (73e) of installing long grass pressing wheel (74)；Its roller length, which is equal to, beats the grass The long grass pressing wheel (74) of diameter is rotatable, the long diameter for being much larger than its grass pressing wheel of axial length, that is, roller of grass pressing wheel, 3 times of the long diameter for being at least its grass pressing wheel of the axial length of grass pressing wheel, that is, roller；The diameter of beating the grass refer to described its outside The distance of the limit (73c) for the rope of beating the grass that shield (73) is equipped with to cutter Pivot axle is to beat the grass radius, 2 times The as diameter of beating the grass；And the long diameter of beating the grass that is equal to of long its roller of grass pressing wheel (74) then can just be pressed onto the grass just cut； The long long grass pressing wheel (74) for being equal to diameter of beating the grass of its described roller is that rotatable and its grass pressing wheel the i.e. roller of axial length is long-range Greater than the diameter of its grass pressing wheel, axial length, that is, roller of grass pressing wheel is long or 10 times or more of the diameter of its grass pressing wheel, with Convenient for pressure grass soil moisture conservation；The long long grass pressing wheel (74) for being equal to diameter of beating the grass of its described roller is equipped with the careless slot (74b) of multiple pressures, slot Along its roller length direction or straight slot or wavy curved slot；And the slot cross-section (74a) for pressing careless slot or rectangular Or it is semicircular, and the careless slot of the multiple pressure is at least 2, in order to press grass soil moisture conservation and meadow embossing and few skidding； The carburetor of its engine sets more bifurcated nozzles (70a) and refers on the outlet of the nozzle (70) of the inside of carburetor It is more bifurcated nozzles (70a) along multiple gaps are set ring week, with improvement mixes combustion fluid state of the vapour through gap and is conducive to atomization； The two cycle engine of double coarse filtration combination fine filtering buffering valve chamber scavenging pressure reducing valve film, is the In near piston top dead center Since piston train of dress portion moves up and make the preparation in latch-release cylinder before the ignition of mixed gas of compressed piston upper in cylinder Air entry is opened, and the gaseous mixture of fuel and air is sucked in the crankcase below piston；The piston generated due to igniting again on The pressure of the burning gases in face, piston is mobile from top dead-centre to bottom dead centre direction and simultaneously closes off air entry, in compression crankcase Gaseous mixture the burning gases in cylinder are discharged to outdoor gas from opening and closing exhaust outlet in the piston upper of bottom dead center-nearby While, the scavenging access being connected by crankcase with cylinder will be mixed in piston upper latch-release cylinder by preparation scavenging port It closes gas and imported into the two cycle engine in cylinder from crankcase；The design has the valve gear with crankshaft-synchronous, this valve is From crankcase to cylinder scavenging mouth, the crankcase side of scavenging access is configured to normally closed；In the gas of the crankcase side of scavenging access When door is closed, the gaseous mixture in scavenging access is allowed to burning of igniting by the flame of combustion gas, and HC is reduced later again from crankshaft Case is to scavenging port, and the crankcase side of scavenging access is allowed to be open, while the burning of scavenging access is sent out with gaseous mixture, in song Gaseous mixture in axle box closes exhaust outlet before being discharged from exhaust outlet, and here it is the two-strokes for substantially reducing the discharge of HC to draw It holds up；Solve in pervious structure and the valve of the above-mentioned crankshaft same period be not because being designed, the flame extinctions of burning gases it If scavenging port is not opened also afterwards, the flame of burning gases can make the gaseous mixture ignition in scavenging access and crankcase, make to mix Without supplying in normal direction cylinder, the opening of exhaust outlet it's early stage will make past the opening of scavenging port to open gas, exhaust outlet in cylinder and When scavenging port is open at the same time, the unblended mixture in crankcase and in scavenging access enters in cylinder from exhaust outlet, so A part of gaseous mixture is discharged in the state of unburned from exhaust outlet, and the gaseous mixture (i.e. HC) become in discharge gas increases The problem of；The present invention is except the air entry exhaust outlet scavenging port, after crankcase scavenging, in the crankshaft of scavenging access Case side has added opening and closing valve, and the gaseous mixture in scavenging access ignites and burns in the flame of combustion gas, and scavenging access and Be in crankcase according to crankshaft and the valve of synchronizing cycle can be truncated, so the gaseous mixture in crankcase will not burn, simultaneously For combustion gas in scavenging access when the valve openings with the crankshaft-synchronous period, the gaseous mixture in crankcase can be in cylinder It is extruded out, the initial stage when exhaust outlet and scavenging port are open simultaneously, the burning gases in scavenging access are fed into cylinder It is interior, HC will not be adulterated into external discharged exhaust gas from exhaust outlet, when exhaust outlet will close, in scavenging access The unblended mixture continued in crankcase in spent gaseous mixture is fed into cylinder, so adulterated in exhaust gas HC amount can control reduction；The valve gear having with crankshaft-synchronous is the c-type circle for adding crank valve (56) on crankshaft (57) (56a), the c-type circle of the crank valve (56) have the two sides of a bit of opening to be set as the inclined wedge circle (56b) at oblique angle, work as one The side for having oblique angle of the two sides of segment opening is rotated with crankshaft, in the mouth of the connection crankcase in the scavenging channel of latch-release cylinder Just there is shearing when portion and reduces impact；It is described that have with the valve gear of crankshaft-synchronous be on crankshaft (57) plus crank valve (56) two sides of a bit of opening of c-type circle (56a) are equipped with the pressure coil (56f) of logarithm, and one when the pressure coil is small The logatithmic spiral side of the two sides of section opening is rotated with crankshaft, in the oral area of the connection crankcase in the scavenging channel of latch-release cylinder When just form the logatithmic spiral of pressure angle properties equivalent everywhere and influence the effect of air-flow and buffering；Noise control strainer in scavenging channel Wedge (11b) be located at beside the technique butt strip (55)；It is equipped with and subtracts in the scavenging channel beside the technique butt strip (55) The catalyst of row rolls up (59) its platiniferous rhodium indium iridium, has catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through, when having certain Between difference and isolation and noise elimination adjustment effect, slow down exhaust outlet from HC to scavenging channel discharge, to be formed in scavenging channel In plus strainer engine；

A kind of engine of improved further noise reduction is additionally provided with strainer i.e. sieve and scavenging oral area buffering in scavenging beneath galleries Valve, double sieve, that is, strainers are to breathing has regulating and controlling effect between gas and crankcase in cylinder；Engine speed is set as 6300 turns per minute It is preferred；Strainer (58) in scavenging channel is the coarse strainer of 60 mesh；And separately having strainer (58) to be located under scavenging channel is 180 mesh Fie screen；The catalyst that a plurality of wire is equipped with emission reduction by strainer made of knitting device rolls up (59), platiniferous, rhodium, indium and dilute Earth elements have catalyst effect and noise control to filter regulating and controlling effect to gas is flowed through；The exhaust gas of engine not direct emission, but first lead to The hush tube containing catalyst (69) is crossed, then by function hush tube (54d), assists the tubule of hush tube (54g), fish scale wedge Then (54e), variable cross-section air hose (54f) noise reduction are run in by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again It puts；There are regular hour delay difference and isolation and noise elimination and obstructs adjustment effect, the ingenious discharge for slowing down pneumatic noise and HC； A kind of engine of the further noise reduction, which is characterized in that its containing silica gel damping pad (54a), function hush tube (54d), Assist the tubule of hush tube (54g), fish scale wedge (54e), variable cross-section air hose (54f)；The exhaust outlet of the cylinder of the engine The connection hush tube containing catalyst (69), then pass through function hush tube (54d), the tubule for assisting hush tube (54g), fish scale point Split (54e), variable cross-section air hose (54f) noise reduction；The outlet side of the hush tube containing catalyst (69) of the exhaust outlet connection of cylinder block (g44) The variable cross-section air hose (54f) to side equipped with the silica gel damping pad (54a) and equipped with series winding；The variable cross-section air hose The inside of (54f) is equipped with the function hush tube (54d)；The function hush tube (54d) is the series winding at interval, and edge The curve of the range of decrease of the approximate similar odd function with reference to multiple limited sinusoidal wave trains that one third octave is the period be Axis；Multiple function hush tube (54d) groups, which are combined into the length of each hush tube of multistage noise elimination and caliber, to be had Variation sees that the length of each hush tube is shortened in single file and caliber is contracted step by step toward outgassing direction from front to back It is small；Each hush tube that multiple function hush tube (54d) groups are combined into multistage noise elimination is equipped with multiple fish scales Wedge (54e) and the wedge (50d) for having through-hole；The fish scale wedge (54e) is equipped with the small slot of arc and has the point of through-hole Split (50d)；The auxiliary hush tube (54g) of the collateral branch of auxiliary is additionally provided on the function hush tube (54d)；The auxiliary disappears Sound pipe (54g) is tubule, and the tubule has the wedge (50d) of through-hole；The variable cross-section air hose (54f) is variable cross-section , be at least three swell and have at three be reduce；The variable cross-section air hose (54f) be it is curved, at least three There is turn at place；The main rotating shaft line for blowing paddle wheel fan and the main rotating shaft line of the Wind Volume turbine (54c) have angle just Hinder outflow of the main noise of noise along straight central axes directly forwardly and rearwardly；What the Wind Volume turbine (54c) came out blows Wind enters on the first function hush tube (54d) being equipped with of inside and the hush tube of the variable cross-section air hose (54f) The small slot of arc and there is the wedge (50d) of through-hole first to be pressed that the multiple fish scale wedges (54e) being equipped with are equipped with Contracting comes out again and expands first order noise elimination process of just completing, the collateral branch for the auxiliary that the function hush tube (54d) is equipped with The tubule of auxiliary hush tube (54g) be for air-flow provides some outlets more and all not mix away from supervisor to further increase Noise elimination effect；The variable cross-section air hose (54f) is variable cross-section, and air-flow has compression-expansion from swollen portion bit stream to position is reduced Booster action；The variable cross-section air hose (54f) is that curved have turn to have booster action to preventing main noise from directly spreading out of；It completes The air-flow of first order noise elimination process come out from first function hush tube (54d), in the swell of the variable cross-section air hose (54f) Cavity in expand, and through bend, the second function hush tube (54d) all changed subsequently into length and caliber and through institute State auxiliary hush tube (54g) and fish scale wedge (54e) the small slot of arc and have through-hole wedge (50d) by compression reflation And complete the noise elimination process that there is frequency variation of making an uproar in the second level；Complete second level noise elimination process from second function hush tube (54d) Air-flow out expands in the cavity of the swell of the variable cross-section air hose (54f), and through bend, subsequently into length and pipe The third function hush tube (54d) that diameter all changes and the arc through auxiliary hush tube (54g) and fish scale wedge (54e) Small slot and have through-hole wedge (50d) compression-expansion and after completing third level noise elimination process, from the air port of diminution, blowout subtracts It makes an uproar, is then discharged indirectly by the nearly tool bore (28a) of the aluminum pipe more than one meter far from population again.