CN206846040U - Fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission - Google Patents

Abstract

The purpose of this utility model, which is to provide outside a kind of piezoelectric type of through type axial admission, is oriented to fuel gas injection valve, it is powered and is extended using piezo-electric crystal, after amplifying via fluid power amplifier, valve piston promotes circle ring disk to move upwards, valve rod band movable valve plug assembly is integrally lifted off a seat motion, realizes the function of gas valve jet；Valve element bottom is using seal band and then forms air inlet ring cavity, and combustion gas enters axially into, and on the one hand avoids combustion gas interference, on the other hand alleviates valve seat quality；Using the valve seat construction with pressure stabilizing cavity, it can effectively inhibit the fluctuation of gaseous-pressure inside fuel gas injection valve, ensure that the stability of fuel gas injection valve whiff pressure；Pressure compensation opening is provided with armature, relief groove is provided with bottom plate, gas circuit inside and outside valve element assembly is promoted to reach balance, it ensure that valve element assembly is poor without gaseous-pressure up and down, valve element assembly is avoided by extra axial force, further increasing the response speed of fuel gas injection valve.

Description

Fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission

Technical field

The utility model relates to a kind of fuel gas injection valve, the combustion specifically on gas machine and bi-fuel internal combustion engine Gas jet valve.

Background technology

Under the overall background of energy-saving and emission-reduction, in face of the increasingly deficient of fossil energy, the increasingly raising of emission regulation demands, seek Looking for a kind of alternative fuel already turns into the inexorable trend of internal combustion engine industry, natural gas, because its own wide material sources, heat The advantages that value is high, exhaust emission is few, turns into the energy most with prospects.In internal combustion engine real work, make using natural gas For the main fuel of internal combustion engine operation, the exhaust emission situation of internal combustion engine can be greatly reduced, to Optimization of Energy Structure, promote economy can Sustainable development has particularly important meaning, already becomes internal combustion engine in recent years using internal combustion engine of the natural gas as main fuel Study hotspot in industry.Fuel gas injection valve is as the important executive component in the air supply system of gas fuel engine, its property The quality of energy directly affects the characteristic of internal combustion engine.At present, in the practical work process of fuel gas injection valve, according to internal combustion The difference of machine rotating speed, the response time of fuel gas injection valve, that is, fuel gas injection valve needed to have typically at several milliseconds between a few tens of milliseconds Standby high response speed is to meet its requirement switched rapidly, and at the same time, fuel gas injection valve also needs possess as far as possible big outlet Cross-sectional area, to ensure that internal combustion engine obtains sufficient fuel gas supply, in addition, fuel gas injection valve supplies itself gas quantity when working How much, the characteristic such as stability and the control accuracy of spraying gaseous-pressure can impact to engine performance.

The content of the invention

The purpose of this utility model is to provide a kind of through type that lift is variable, response speed is high, whiff pressure is stable Fuel gas injection valve is oriented to outside the piezoelectric type of axial admission.

What the purpose of this utility model was realized in：

Fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission of the utility model, it is characterized in that：Including valve Body, valve seat, valve rod, piezo-electric crystal, fluid power amplifier, dividing plate, valve element assembly, valve seat be fixed on below valve body and with valve body it Between form valve space, the inner upper of valve body is fixed with fixed block, is provided with straight trough in the middle part of fixed block, piezo-electric crystal is arranged on straight trough In, dividing plate is set in the middle part of valve body, fluid power amplifier is set above dividing plate, valve element assembly is set below dividing plate, the fluid power is put Big device includes big piston, valve piston, sleeve, and sleeve is arranged on dividing plate, and the center of sleeve upper end is thick outlet, sleeve upper end End is thin outlet, and big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, between the flange and sleeve of big piston Big piston support spring is set, valve piston support spring, big piston, valve piston lower section are set between the flange and sleeve of valve piston Sleeve in fit together filled with hydraulic oil, big piston upper surface with piezo-electric crystal lower surface, big piston exterior sets annulus Disk, valve piston upper surface are bonded with circle ring disk lower surface, and groove, the both ends point of back-moving spring are respectively provided with circle ring disk and fixed block It is not arranged in the groove of circle ring disk and fixed block, described valve element assembly includes armature, spring base, bottom plate, valve element, rank Iron, bottom plate, valve element arrange while linked together by fastening bolt that spring base is located at outside armature and and armature from top to bottom Between form annular groove, dividing plate lower surface sets annular groove, and the both ends of back-moving spring are arranged in the annular groove and bullet of dividing plate In the annular groove of spring abutment, pressure compensation opening being set at armature center, relief groove is set on bottom plate, valve element is hollow structure, Center pressure stabilizing cavity is set on the valve seat below valve element, and pressure compensation opening, relief groove, the hollow space of valve element and center are steady Pressure chamber is communicated and forms inner space, and seal band is set on valve element, and seal band forms air inlet ring cavity, outlet is set on valve seat Annulus and guide pad, guide pad are located at around valve element, and outlet annulus is located at below air inlet ring cavity, and outlet is set below outlet annulus Mouthful, through hole and passage are set respectively on dividing plate, the middle part of valve rod passes through through hole, and the top of valve rod is connected with circle ring disk, valve rod Lower section be fixed together by jump ring and armature.

The utility model can also include：

1st, the outer end of valve seat sets end pressure stabilizing cavity.

2nd, air inlet, the middle and lower part of fixed block and fluid power amplifier and and valve are formed between the top of fixed block and valve body Inlet chamber is formed between body, diversion cavity, air inlet, inlet chamber, passage, diversion cavity phase are formed between valve element assembly and valve body Lead to and form exterior space, exterior space is communicated with inner space, and axial admission hole is set on valve element；

Combustion gas is vertically flowed into valve body via air inlet, along inlet chamber perpendicular flow, until passage is flowed through, a part Combustion gas is flowed into valve element assembly inner space and valve seat center pressure stabilizing cavity, remaining combustion gas continue to flow along diversion cavity, one Divide and flowed into by axial admission hole, the air inlet ring cavity full of valve element, another part is full of the end pressure stabilizing cavity and valve element of seat outer end Surrounding space；

When piezo-electric crystal is not powered on, the upper surface of seal band and valve seat on valve element is fitted close, and combustion gas is full of combustion gas The exterior space of the valve inner of injection valve and inner space；Piezo-electric crystal be powered after, piezo-electric crystal by current excitation so as to Elongation, promote big piston to move downward, the hydraulic oil in sleeve is compressed, in the presence of hydraulic fluid pressure, valve piston to Upper motion, valve rod also move upwards, and under the fixation of jump ring, band movable valve plug assembly moves upwards, until in sleeve Hydraulic fluid pressure returns to original state, and valve piston no longer moves, and valve element assembly stops therewith, and combustion gas is entered by the axial direction on valve element Stomata flows into, and by air inlet ring cavity, the space between valve element and valve seat, is vertically flowed out after being finally oriented to via gas outlet； After piezo-electric crystal power-off, piezo-electric crystal shortens, and in the presence of big piston support spring, big piston returns to initial position, sleeve Interior hydraulic fluid pressure declines, and in the presence of back-moving spring, circle ring disk, valve piston move downward, and valve rod, valve element assembly are therewith Move downward, until hydraulic fluid pressure returns to original state in sleeve, big piston, valve piston return to initial position, valve element combination Body returns to initial position, and spool face is bonded with valve base surface, and fuel gas injection valve is closed, and gas circuit is closed.

Advantage of the present utility model is：Of the present utility model be powered using piezo-electric crystal is extended, via fluid power amplifier After displacement enlargement, the valve piston being arranged symmetrically promotes circle ring disk smoothly to move upwards, and circle ring disk passes through valve rod band movable valve plug group Fit overall motion of being lifted off a seat under the outer guide effect of the guide pad in outside, realize the function of gas valve jet；This practicality It is new to effectively increase the response speed of fuel gas injection valve by the way of piezo-electric crystal driving, it is different by piezo-electric crystal Current driver mode, the lift for realizing fuel gas injection valve are variable；The utility model using straight-through plenum system, ensure that into Enter the sufficient supply of the combustion gas in valve body；Valve element bottom is using seal band and then forms air inlet ring cavity, and combustion gas enters axially into, On the one hand combustion gas interference is avoided, ensure that gas circuit balances, on the other hand alleviate valve seat quality, improve response speed；This Utility model uses the valve seat construction with pressure stabilizing cavity, and it can effectively inhibit the ripple of gaseous-pressure inside fuel gas injection valve It is dynamic, it ensure that the stability of fuel gas injection valve whiff pressure；The utility model is provided with pressure compensation opening at armature, in bottom plate Place is provided with relief groove, promotes gas circuit inside and outside valve element assembly to reach balance, ensure that valve element assembly up and down without combustion gas Pressure differential, valve element assembly is avoided by extra axial force, the response speed of fuel gas injection valve is further increasing, drops The control difficulty of low fuel gas injection valve work.

Brief description of the drawings

Fig. 1 is structural representation of the present utility model；

Fig. 2 is valve element composite unit structure enlarged drawing of the present utility model；

Fig. 3 is that gas circuit of the present utility model moves towards figure；

Fig. 4 is valve element three-dimensional structure enlarged drawing；

Fig. 5 is valve seat three-dimensional structure enlarged drawing.

Embodiment

Illustrate below in conjunction with the accompanying drawings and the utility model is described in more detail：

With reference to Fig. 1-5, Fig. 1 is that fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission of the utility model Overall structure diagram, including 1 valve body, 2 piezo-electric crystals, 3 fixed blocks, 4 big pistons, 5 big piston support springs, 6 sealing rings, 7 Sleeve, 9 back-moving springs, 10 circle ring disks, 11 valve rods, 12 valve piston support springs, 13 valve pistons, 15 jump rings, 16 dividing plates, 17 valve elements Assembly, 19 O-ring seals and 20 valve seats, fixed block 3 are linked together using screw thread and valve body 1, its own is fixed on valve body The center of 1 top, fixed block 3 are provided with the straight trough of certain depth in center, and piezo-electric crystal 2 is arranged therein, straight The less through hole of a diameter is provided with above groove, for arranging connecting wires for piezo-electric crystal 2 and the outer control unit of valve body 1, piezo crystals The lower surface of body 2 is in contact with the big upper surface of piston 4, under the pretightning force effect of big piston support spring 5, the following table of piezo-electric crystal 2 Together with face is brought into close contact with the big upper surface of piston 4, the upper end of sleeve 7 is multiple exit form, and central outlet is thick outlet, is around gone out Mouth is thin outlet, is arranged symmetrically in the lower section of circle ring disk 10, and lower end is a closing chamber connected, and the lower end of big piston 4 is arranged in In the thick outlet at the center of sleeve 8, big piston support spring 5 ensures that big piston 4 will not between the big flange of piston 4 and sleeve 7 It is overall to enter in sleeve 7, it is filled with the hydraulic oil 14 with certain pressure in sleeve 7, is arranged above the thin outlet around sleeve 7 There is valve piston 13, the lower end of valve piston 13 is arranged therein, and valve piston support bullet is disposed between the flange of valve piston 13 and sleeve 7 Spring 12, to ensure that valve piston 13 integrally will not enter in sleeve 7, between big piston 4, the side surface of valve piston 13 and the inwall of sleeve 7 Sealing ring 6 is disposed with, it is big piston 4, valve piston 13, big piston support spring 5, small to prevent the leakage of hydraulic oil 14 in sleeve 7 Piston support spring 12 has together constituted with the fluid power amplifier of piezo-electric crystal with sleeve 7, and fluid power amplifier is as an overall cloth Put in the top of the median septum 16 of valve body 1, under the pretightning force effect of valve piston support spring 12, the upper surface of valve piston 13 and annulus The lower surface of disk 10 is brought into close contact, and the both ends of back-moving spring 9 are arranged in the groove on fixed block 3 and circle ring disk 10, annulus The both ends of disk 10 are provided with circular hole, and screw thread is provided with hole, and circle ring disk 10 and valve rod 11 are linked together using screw thread, the cloth of valve rod 11 Put in the through hole in dividing plate 16, its lower end is fixed together using jump ring 15 and the upper end of valve element assembly 17, the both ends of dividing plate 16 The passage being relatively large in diameter also is provided with, has been sequentially arranged valve element assembly 17, valve seat 20, valve seat from top to bottom below dividing plate 16 Bolt hole 39 is provided with 20, together with valve seat 20 is bolted to connection between valve body 1, mating surface therebetween passes through O-ring seal 19 seals to realize, valve seat 20 is provided with pressure stabilizing cavity 8, valve in center and close to both ends at seal band 26 The pressure stabilizing cavity 8 of 20 centers of seat is connected with the combustion gas space inside valve element assembly 17, and the pressure stabilizing cavity 8 at the both ends of valve seat 20 It is connected with the diversion cavity 35 in valve body 1；

As shown in Fig. 2 a kind of piezoelectric type of through type axial admission outside be oriented to fuel gas injection valve valve element assembly 17 by Armature 22, spring base 23, bottom plate 24, valve element 25, armature back-moving spring 28, pad 29 and fastening bolt 31 form, and armature 22 is logical Cross fastening bolt 31 to link together with bottom plate 24, valve element 25, one layer of pad 29, armature are disposed between armature 22 and bottom plate 24 It is provided with pressure compensation opening 27 on 22, the top of bottom plate 24 is provided with four relief grooves 30, the pressure compensation opening at the center of armature 22 Relief groove 30 on 27 cooperation bottom plates 24 causes the inner space of valve element assembly 17 to be connected with exterior space, and inside and outside gas circuit reaches To balance, the inside and outside combustion gas no pressure of valve element assembly 17 is poor, by extra axial force, spring base when avoiding from motion 23 are arranged on the top of bottom plate 24, and its internal side surface is in contact with the side surface of armature 22, and the two of armature back-moving spring 28 End is arranged in dividing plate 16 and on the annular groove of spring base 23, valve element 25 is made up of valve element main body, seal band 26, its circumference It is fixed on four guide pads 18 on valve seat 20, ensures itself perpendicularity, the integral arrangement of valve element assembly 17 is under dividing plate 16 Side；

As shown in figure 3, combustion gas is oriented in fuel gas injection valve outside a kind of piezoelectric type of through type axial admission, and first, combustion Gas is vertically flowed into valve body 1 via air inlet 32, along the perpendicular flow of inlet chamber 33, until flowing through the both ends of 1 upper spacer of valve body 16 Passage 34, due to the presence of the relief groove 30 on the upper pressure balance hole 27 of armature 22 and bottom plate 24, valve element assembly 17 inner spaces connect with space in valve body 1, and a part of combustion gas can be flowed into the inner space of valve element assembly 17, be filled with immediately Pressure stabilizing cavity 8 at the inner space of valve element assembly 17 and the center of valve seat 20；Remaining combustion gas flows into along diversion cavity 35 is full of valve Inside body 1, a part is flowed into by axial admission hole 36, full of there is certain depth to enter compression ring around multiple-sealed annulus 26 Chamber 37, another part are filled with the surrounding space of the pressure stabilizing cavity 8 and valve element 25 at the both ends of valve seat 20.Piezo-electric crystal 2 is not powered on When, the surface of valve element 25 fits with the surface of valve seat 20, on the air inlet ring cavity 37 on valve element 25 and valve seat 20 near outlet annulus 21 Ring cavity do not connect；After piezo-electric crystal 2 is powered, piezo-electric crystal 2 extends, the band movable valve plug assembly 17 after the amplification of fluid power amplifier Motion upwards, the surface of valve element 25 depart from the surface of valve seat 20, and now air inlet ring cavity 37 is connected with the ring cavity near outlet annulus 21, The lifting and take a seat of valve element 25 controls the break-make between the ring cavity near air inlet ring cavity 37 and outlet annulus 21.

In the fuel gas injection valve course of work, when piezo-electric crystal 2 is not powered on, in the presence of armature back-moving spring 28, valve element Assembly 17 remains motionless in initial position, the upper table of the seal band 26 and valve seat 20 on valve element 25 in valve element assembly 17 Face is fitted close, and the air inlet ring cavity 37 on valve element 25 does not connect with the ring cavity on valve seat 20 near outlet annulus 21, and combustion gas is full of Whole space inside the valve body 1 of fuel gas injection valve.After piezo-electric crystal 2 is powered, piezo-electric crystal 2 is by current excitation so as to stretching It is long, promote big piston 4 to move downward, the hydraulic oil 14 in sleeve 7 is compressed, pressure rise, in the work of the pressure of hydraulic oil 14 Under, the valve piston 13 in sleeve 7 in thin outlet moves upwards, and valve piston 13 is symmetrically distributed in the lower section of circle ring disk 10, steadily Ground promotes circle ring disk 10 to move upwards, due to the connection function of screw thread, the also motion upwards of valve rod 11, finally in the fixation of jump ring 15 Under effect, band movable valve plug assembly 17 moves upwards, in the motion process of valve element assembly 17, is realized by guide pad 18 outer It is oriented to, until the pressure of hydraulic oil 14 in sleeve 7 returns to original state, valve piston 13 no longer moves, and valve element assembly 17 is therewith Stop, valve element assembly 17 maintains a period of time in the position, and combustion gas is flowed into by the axial admission hole 36 on valve element 25, by more There is the air inlet ring cavity 37 of certain depth around road seal band 26, via the space between valve element 25 and valve seat 20, most pass through afterwards Vertically to be flowed out after being oriented to by gas outlet 38, multiple tracks annulus, face sealing are used between valve element 25 and valve seat 20, voltage stabilizing balances, and compared with Wide annulus area can reduce impact, improve reliability, valve seat 20 is close to the both ends of air inlet ring cavity 37 and its center position The pressure stabilizing cavity 8 that place is set causes the combustion gas of surrounding to be ventilated in flow process uniformly, air pressure balance；After combustion gas ejection is a certain amount of, Piezo-electric crystal 2 starts to power off, and piezo-electric crystal 2 shortens, and in the presence of big piston support spring 5, big piston 4 is begun to return to initially Position, the pressure of hydraulic oil 14 declines in sleeve 7, and in the presence of back-moving spring 9, circle ring disk 10, valve piston 13 start to transport downwards Dynamic, valve rod 11, valve element assembly 17 move downward therewith, until the pressure of hydraulic oil 14 returns to original state, big piston in sleeve 7 4th, valve piston 13 returns to initial position, and now valve element assembly 17 is also corresponding returns to initial position, the surface of valve element 25 and valve seat 20 surfaces are bonded, and come back to initial position, and fuel gas injection valve is closed, and gas circuit is closed.

From the above-mentioned course of work：Gas injection is oriented to outside a kind of piezoelectric type of through type axial admission of the utility model Valve is penetrated, in the course of the work, is powered and extended using piezo-electric crystal 2, after fluid power amplifier displacement enlargement, what is be arranged symmetrically is small Piston 13 promotes the smoothly motion upwards of circle ring disk 10, and circle ring disk 10 is by valve rod 11 with the entirety of movable valve plug assembly 17 in outside Guide pad 18 outer guide effect under lift off a seat 20 motions, realize the function of gas valve jet；The utility model is using pressure The mode that electric crystal 2 drives, effectively increases the response speed of fuel gas injection valve, and the lift for realizing fuel gas injection valve is variable； The utility model ensure that the abundance supply into the combustion gas in valve body 1 using straight-through plenum system；Apply the bottom of valve element 25 Seal band 26 and then formation air inlet ring cavity 37, combustion gas enters axially into, and on the one hand avoids combustion gas interference, ensure that gas circuit is put down Weighing apparatus, on the other hand alleviates the mass of valve seat 20, improves response speed；The utility model uses the valve seat 20 with pressure stabilizing cavity 8 Structure, it can effectively inhibit the fluctuation of gaseous-pressure inside fuel gas injection valve, ensure that fuel gas injection valve whiff pressure Stability；The utility model is provided with pressure compensation opening 27 at armature 22, and relief groove 30 is provided with bottom plate 24, promotees Gas circuit inside and outside valve element assembly 17 is reached balance, ensure that valve element assembly is poor without gaseous-pressure about 17, avoid valve element Assembly 17 further increasing the response speed of fuel gas injection valve, reduce fuel gas injection valve by extra axial force The control difficulty of work.

Fuel gas injection valve, including valve body, piezo crystals are oriented to outside a kind of piezoelectric type of through type axial admission of the utility model Body, fixed block, big piston, big piston support spring, sealing ring, sleeve, back-moving spring, circle ring disk, valve rod, valve piston support bullet Spring, valve piston, jump ring, valve element assembly, O-ring seal and valve seat, fixed block are linked together using screw thread and valve body, make it The center itself being fixed on above valve body, fixed block are provided with the straight trough of certain depth, piezo-electric crystal arrangement in center Wherein, the less through hole of a diameter is provided with above straight trough, electricity is connect for arrange piezo-electric crystal and valve body outer control unit Line, piezo-electric crystal lower surface are in contact with big piston upper surface, under the pretightning force effect of big piston support spring, piezo-electric crystal Together with lower surface is brought into close contact with big piston upper surface, sleeve upper end is multiple exit form, and central outlet is thick outlet, around It is the closing chamber of a connection to export as the thin lower section for exporting, being arranged symmetrically in circle ring disk, lower end, and the lower end of big piston is arranged in set In the thick outlet at cylinder center, big piston support spring ensures that big piston will not integrally enter between big plunger flange and sleeve Enter in sleeve, the hydraulic oil with certain pressure is filled with sleeve, valve piston is disposed with above the thin outlet of all around stems, it is small Piston is arranged therein, and valve piston support spring is disposed between valve piston flange and sleeve, to ensure valve piston not It can integrally enter in sleeve, sealing ring is disposed between big piston, valve piston side surface and sleeve lining, to prevent liquid in sleeve The leakage of force feed, big piston, valve piston, big piston support spring, valve piston support spring and sleeve have together constituted with piezo crystals The fluid power amplifier of body, fluid power amplifier as an integral arrangement in the top of valve body median septum, in valve piston support spring Pretightning force effect under, valve piston upper surface is brought into close contact with circle ring disk lower surface, and the both ends of back-moving spring, which are arranged in, to be consolidated Determine in the groove on block and circle ring disk, the both ends of circle ring disk are provided with circular hole, and screw thread is provided with hole, using screw thread by circle ring disk and valve Bar is linked together, and valve rod is arranged in the through hole in dividing plate, and its lower end is fixed on one using jump ring and valve element assembly upper end Rise, dividing plate both ends are also provided with the passage being relatively large in diameter, and have been sequentially arranged valve element assembly, valve from top to bottom below dividing plate Seat, bolt hole is provided with valve seat, together with valve seat is bolted to connection between valve body, mating surface therebetween passes through O-ring seal seals to realize, valve seat is provided with pressure stabilizing cavity, valve seat center in center and close to both ends at seal band The pressure stabilizing cavity of position is connected with the combustion gas space inside valve element assembly, and the water conservancy diversion in the pressure stabilizing cavity and valve body at valve seat both ends Chamber is connected；Foregoing valve element assembly is by armature, spring base, bottom plate, valve element, armature back-moving spring, pad and fastening bolt Composition, armature are linked together by fastening bolt and bottom plate, valve element, and one layer of pad, armature are disposed between armature and bottom plate On be provided with pressure compensation opening, be provided with four relief grooves above bottom plate, the pressure compensation opening at armature center coordinates on bottom plate Relief groove valve element assembly inner space is connected with exterior space, inside and outside gas circuit reaches balance, valve element assembly Inside and outside combustion gas no pressure it is poor, by extra axial force when avoiding from motion, spring base is arranged on the top of bottom plate, its Internal side surface is in contact with the side surface of armature, and the both ends of armature back-moving spring are arranged in the ring of dividing plate and spring base On shape groove, valve element is made up of valve element main body, seal band, on its circumferentially fixed four guide pad on valve seat, ensures itself Perpendicularity, valve element assembly integral arrangement is below dividing plate；Combustion gas is vertically flowed into valve body via air inlet, is hung down along inlet chamber Direct current moves, until the passage at valve body upper spacer both ends is flowed through, due to the pressure balance on armature upper pressure balance hole and bottom plate The presence of groove, valve element assembly inner space are connected with space in valve body, and a part of combustion gas can be flowed into inside valve element assembly Space, the pressure stabilizing cavity being filled with immediately at valve element assembly inner space and valve seat center；Remaining combustion gas is along diversion cavity stream Enter and be full of valve inner, a part is flowed into by axial admission hole, full of the entering with certain depth around multiple-sealed annulus Compression ring chamber, another part are filled with the surrounding space of the pressure stabilizing cavity and valve element at valve seat both ends.When piezo-electric crystal is not powered on, valve Wicking surface fits with valve base surface, and the air inlet ring cavity on valve element does not connect with the ring cavity of outlet adjacent annular bands on valve seat；Piezoelectricity After crystal is powered, piezo-electric crystal elongation, band movable valve plug assembly moves upwards after the amplification of fluid power amplifier, and spool face departs from Valve base surface, now air inlet ring cavity be connected with the ring cavity of outlet adjacent annular bands, lifting and taking a seat for valve element controls compression ring Break-make between the ring cavity of chamber and outlet adjacent annular bands.

Claims (3)

1. fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission, it is characterized in that：Including valve body, valve seat, valve rod, Piezo-electric crystal, fluid power amplifier, dividing plate, valve element assembly, valve seat are fixed on below valve body and valve space are formed between valve body, The inner upper of valve body is fixed with fixed block, and straight trough is provided with the middle part of fixed block, and piezo-electric crystal is arranged in straight trough, is set in the middle part of valve body Dividing plate is put, fluid power amplifier is set above dividing plate, valve element assembly is set below dividing plate, the fluid power amplifier includes big living Plug, valve piston, sleeve, sleeve are arranged on dividing plate, and the center of sleeve upper end is thick outlet, and the end of sleeve upper end is carefully to go out Mouthful, big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, and big piston is set between the flange and sleeve of big piston Support spring, valve piston support spring is set between the flange and sleeve of valve piston, filled in the sleeve below big piston, valve piston There is hydraulic oil, big piston upper surface fits together with piezo-electric crystal lower surface, big piston exterior setting circle ring disk, on valve piston Surface is bonded with circle ring disk lower surface, and groove is respectively provided with circle ring disk and fixed block, and the both ends of back-moving spring are arranged in circle In the groove of the ring disk and fixed block, described valve element assembly includes armature, spring base, bottom plate, valve element, armature, bottom plate, valve element Arrangement is linked together by fastening bolt simultaneously from top to bottom, and spring base is located at outside armature and annular is formed between armature Groove, dividing plate lower surface set annular groove, and the both ends of back-moving spring are arranged in the annular groove of dividing plate and the annular groove of spring base It is interior, pressure compensation opening is set at armature center, relief groove is set on bottom plate, valve element is hollow structure, the valve below valve element Center pressure stabilizing cavity is set on seat, and pressure compensation opening, relief groove, the hollow space of valve element and center pressure stabilizing cavity communicate and structure Into inner space, seal band is set, seal band forms air inlet ring cavity, outlet annulus and guiding are set on valve seat on valve element Block, guide pad are located at around valve element, and outlet annulus is located at below air inlet ring cavity, setting gas outlet below outlet annulus, on dividing plate Through hole and passage, the middle part of valve rod is set to pass through through hole respectively, the top of valve rod is connected with circle ring disk, passed through below valve rod Jump ring is fixed together with armature.

2. fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission according to claim 1, it is characterized in that： The outer end of valve seat sets end pressure stabilizing cavity.

3. fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type axial admission according to claim 1 or 2, its feature It is：Air inlet, shape between the middle and lower part of fixed block and fluid power amplifier and valve body are formed between the top of fixed block and valve body Into inlet chamber, diversion cavity is formed between valve element assembly and valve body, air inlet, inlet chamber, passage, diversion cavity are communicated and formed Exterior space, exterior space are communicated with inner space, and axial admission hole is set on valve element；

Combustion gas is vertically flowed into valve body via air inlet, along inlet chamber perpendicular flow, until flowing through passage, a part of combustion gas Be flowed into valve element assembly inner space and valve seat center pressure stabilizing cavity, remaining combustion gas continue to flow along diversion cavity, a part by Axial admission hole flows into, the air inlet ring cavity full of valve element, the week of end pressure stabilizing cavity and valve element of the another part full of seat outer end Confining space；

When piezo-electric crystal is not powered on, the upper surface of seal band and valve seat on valve element is fitted close, and combustion gas is full of fuel gas injection The exterior space of the valve inner of valve and inner space；Piezo-electric crystal be powered after, piezo-electric crystal by current excitation so as to extend, Big piston is promoted to move downward, the hydraulic oil in sleeve is compressed, and in the presence of hydraulic fluid pressure, valve piston is transported upwards Dynamic, valve rod also moves upwards, and under the fixation of jump ring, band movable valve plug assembly moves upwards, until the hydraulic pressure in sleeve Oil pressure returns to original state, and valve piston no longer moves, and valve element assembly stops therewith, and combustion gas is by the axial admission hole on valve element Flow into, by air inlet ring cavity, the space between valve element and valve seat, vertically flowed out after being finally oriented to via gas outlet；Piezoelectricity After crystal power-off, piezo-electric crystal shortens, and in the presence of big piston support spring, big piston returns to initial position, liquid in sleeve Oil pressure declines, and in the presence of back-moving spring, circle ring disk, valve piston move downward, and valve rod, valve element assembly are downward therewith Motion, until hydraulic fluid pressure returns to original state in sleeve, big piston, valve piston return to initial position, and valve element assembly returns To initial position, spool face is bonded with valve base surface, and fuel gas injection valve is closed, and gas circuit is closed.