CN206816407U - Fuel gas injection valve is oriented in a kind of piezoelectric type of bypass type axial admission - Google Patents

Abstract

The purpose of this utility model, which is to provide, is oriented to fuel gas injection valve in a kind of piezoelectric type of bypass type axial admission, it is powered and is extended using piezo-electric crystal, moved via the guide finger of fluid power amplifier displacement enlargement pusher movable valve plug assembly, the overall motion of being lifted off a seat between guide finger and dividing plate under the interior guide effect of mating surface of valve element assembly, realize the function of gas valve jet；Using the plenum system of bypass, flowing of the combustion gas in valve body is oriented to；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, ensure that gas circuit balances, on the other hand alleviates valve seat quality, improve response speed；The utility model uses the valve seat construction with pressure stabilizing cavity, and 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.

Description

Fuel gas injection valve is oriented in a kind of piezoelectric type of bypass 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

With developing rapidly for society, the demand of the energy increasingly increases, and also increasingly sharpens the problem of environmental pollution, natural gas Because of its own rich reserves, cheap and there is good economy and emission performance, turn into the energy most with prospects, Internal combustion engine industry, the main fuel using natural gas as internal combustion engine operation, there is significant effect for reducing emission problem, because This, already becomes as the internal combustion engine of main fuel the study hotspot in internal combustion engine industry using natural gas in recent years.Gas injection Penetrate valve and directly affect internal combustion engine as the important executive component in the air supply system of gas fuel engine, the quality of its performance Characteristic.At present, in the practical work process of fuel gas injection valve, according to the difference of internal-combustion engine rotational speed, fuel gas injection valve Response time typically at several milliseconds between a few tens of milliseconds, i.e., fuel gas injection valve need to possess high response speed to meet that its is fast The requirement of speed switch, at the same time, fuel gas injection valve also needs to possess as far as possible big outlet cross-section area, to ensure that internal combustion engine obtains Sufficient gas quantity, in addition, the flow regime of combustion gas itself, the stability for spraying gaseous-pressure and control when fuel gas injection valve works The characteristics such as precision processed can impact to engine performance.

The content of the invention

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

What the purpose of this utility model was realized in：

Fuel gas injection valve is oriented in a kind of piezoelectric type of bypass type axial admission of the utility model, it is characterized in that：Including valve Body, valve seat, piezo-electric crystal, fluid power amplifier, dividing plate, valve element assembly, valve body are fixedly arranged above fixed block, opened in the middle part of fixed block Have a straight trough, piezo-electric crystal is arranged in straight trough, and valve body is fixed on valve seat, sets dividing plate in valve body, fluid power amplifier set every Above plate, valve element assembly is arranged on below dividing plate, sets through hole on dividing plate respectively, shape between the valve body and valve seat below dividing plate Into valve space, the fluid power amplifier includes big piston, valve piston, sleeve, and sleeve is arranged on dividing plate, the end of sleeve upper end Thick outlet is set, and sleeve upper end tip inside sets thin outlet, and big piston is arranged in thick outlet, and valve piston is arranged on thin outlet In, big piston support spring is set between the flange and sleeve of big piston, valve piston is set between the flange and sleeve of valve piston Support spring, filled with hydraulic oil in the sleeve below big piston, valve piston, guide finger passes through the through hole of dividing plate, guide finger it is upper Side sets control valve rod, sets guide finger back-moving spring between guide finger and control valve rod, controls upper surface and the piezoelectricity of valve rod Crystal fits together, and the lower surface and big piston upper surface for controlling valve rod fit together, valve piston upper surface and guide finger Fit together, described valve element assembly includes armature, spring base, bottom plate, valve element, armature, bottom plate, valve element cloth from top to bottom Put while linked together by fastening bolt, spring base is located at outside armature and annular groove is formed between armature, under dividing plate Surface sets annular groove, and the both ends of armature back-moving spring are arranged in the annular groove of dividing plate and the annular groove of spring base, led Mutually to be fixed with armature to pin, pressure compensation opening is set in guide finger, 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, outlet annulus are located at below air inlet ring cavity, and gas outlet is set below outlet annulus.

The utility model can also include：

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

The 2nd, extension is set on valve body, extension sets air inlet, and diversion cavity is set in the valve body below air inlet, Air inlet, diversion cavity are communicated and form exterior space, and exterior space communicates with inner space, and axial admission hole is set on valve element；

Combustion gas vertically flows into diversion cavity through air inlet, and a part of combustion gas is flowed into the center voltage stabilizing of inner space and valve seat Chamber, remaining combustion gas are flowed into above valve element, and a part of combustion gas stream is through axial air admission hole, full of the air inlet ring cavity on valve element, another portion Combustion gas is divided to flow into the end pressure stabilizing cavity of valve seat outer end；

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, guide finger are also moved upwards, and band movable valve plug assembly is moved upwards, and fuel gas injection valve is opened, and gas circuit is opened, Zhi Daotao Cylinder in hydraulic fluid pressure return to original state, big piston and valve piston no longer move, and valve element assembly stops therewith, combustion gas by Axial admission hole on valve element flows into, and by air inlet ring cavity, the space between valve element and valve seat, is finally led via gas outlet Vertical outflow backward；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, hydraulic fluid pressure declines in sleeve, and in the presence of guide finger back-moving spring, guide finger moves downward, valve piston, Valve element assembly moves downward therewith, until hydraulic fluid pressure returns to original state in sleeve, big piston, valve piston return to initially Position, valve element assembly return 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：The utility model is powered using piezo-electric crystal to be extended, and is put via fluid power amplifier The guide finger motion of big displacement pusher movable valve plug assembly, valve element assembly entirety is between guide finger and dividing plate in mating surface Lifted off a seat under guide effect motion, realize the function of gas valve jet；The utility model using piezo-electric crystal driving by the way of, The response speed of fuel gas injection valve is effectively increased, by the different current driver mode of piezo-electric crystal, realizes fuel gas injection The lift of valve is variable；The utility model is oriented to using the plenum system of bypass to flowing 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, and on the one hand avoids combustion gas interference, ensure that gas Road balances, and on the other hand alleviates valve seat quality, improves response speed；The utility model uses the valve seat knot with pressure stabilizing cavity Structure, it can effectively inhibit the fluctuation of gaseous-pressure inside fuel gas injection valve, ensure that the steady of fuel gas injection valve whiff pressure It is qualitative；The utility model is provided with pressure compensation opening at guide finger, and relief groove is provided with bottom plate, promotes valve element group Gas circuit reaches balance inside and outside zoarium, ensure that valve element assembly is poor without gaseous-pressure up and down, avoids valve element assembly by volume Outer axial force, the response speed of fuel gas injection valve is further increasing, reduce the control difficulty of 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 in a kind of piezoelectric type of bypass type axial admission of the utility model Overall structure diagram, including 1 fixed block, 2 piezo-electric crystals, 3 valve bodies, 4 control valve rods, 5 big pistons, 6 big piston support springs, 7 sealing rings, 8 sleeves, 9 O-ring seals, 10 O-ring seals, 12 bolts, 13 O-ring seals, 14 guide finger back-moving springs, 15 Valve piston, 16 valve piston support springs, 19 valve element assemblys and 21 valve seats.Valve body 3 is a cuboid, close to its center one end The air inlet 33 and diversion cavity 34 of combustion gas are provided with, certain depth is provided with vertically in the other end close to the center of valve body 3 Hole, the dividing plate 18 of certain depth is separated among holes, the through hole of the lower section of dividing plate 18 is connected with diversion cavity 34, and fixed block 1 is sharp Itself and valve body 3 are linked together with bolt 12, the center for making its own be fixed on the top through hole top of dividing plate 18, Keep sealing by O-ring seal 13 in mating surface between fixed block 1 and valve body 3, fixed block 1 is provided with center The straight trough of certain depth, piezo-electric crystal 2 are arranged therein, and the less through hole of a diameter is provided with above straight trough, are pressed for arranging Electric crystal 2 is connected wires with the outer control unit of valve body 3, and the lower section close arrangement of piezo-electric crystal 2 has control valve rod 4, control valve rod 4 Lower surface is in contact with the big upper surface of piston 5, under the pretightning force effect of guide finger back-moving spring 14, big piston support spring 6, The lower surface of piezo-electric crystal 2 is fitted tightly over one with control valve rod 4 upper surface, the control lower surface of valve rod 4 with the big upper surface of piston 5 Rise, the upper end of sleeve 8 is two outlets, is a thick outlet and a thin outlet respectively, and lower end is the closing chamber of a connection, big piston 5 Lower end is arranged in the thick outlet of sleeve 8, and big piston support spring 6 ensures big living between the big flange of piston 5 and sleeve 8 Plug 5 integrally will not enter in sleeve 8, and the hydraulic oil 17 with certain pressure, the thin outlet top of sleeve 8 are filled with sleeve 8 Valve piston 15 is disposed with, the lower end of valve piston 15 is arranged therein, and valve piston branch is disposed between the flange of valve piston 15 and sleeve 8 Support spring 16, with ensure valve piston 15 will not integrally enter sleeve in, big piston 5, the side surface of valve piston 15 and the inwall of sleeve 8 it Between be disposed with sealing ring 7, to prevent the leakage of hydraulic oil 17 in sleeve 8, big piston 5, valve piston 15, big piston support spring 6, Valve piston support spring 16 has together constituted with the fluid power amplifier of piezo-electric crystal 2 with sleeve 8, and fluid power amplifier is as an entirety The top of the median septum 18 of valve body 3 is arranged in, control valve rod 4 has been sequentially arranged valve element assembly from top to bottom below center 19th, valve seat 21, under the pretightning force effect of valve piston support spring 16, the upper surface of valve piston 15 and the upper end of valve element assembly 19 It is brought into close contact, bolt hole 38 is provided with valve seat 21, together with valve seat 21 is bolted to connection between valve body 3, the two it Between mating surface sealing is realized by O-ring seal 10, both ends are equal in center and at the seal band 27 for valve seat 21 Pressure stabilizing cavity 11 is provided with, the pressure stabilizing cavity 11 of the center of valve seat 21 is connected with the combustion gas space inside valve element assembly 19, and valve The pressure stabilizing cavity 11 at 21 both ends of seat is connected with the diversion cavity 33 in valve body 3；

As shown in Fig. 2 a kind of piezoelectric type of bypass type axial admission in be oriented to fuel gas injection valve valve element assembly 19 by Guide finger 22, armature 23, spring base 24, bottom plate 25, valve element 26, armature back-moving spring 29, pad 30 and fastening bolt 32 form, To ensure that guide finger 22 is smoothly moved, multiple sleeves 8 are disposed with thereunder, corresponding multiple valve pistons 15 are arranged symmetrically in The lower section of guide finger 22, number is even number, in the presence of valve piston support spring 16, the upper surface of valve piston 15 and valve element group The lower surface of guide finger 22 in zoarium 19 is brought into close contact, and the center of guide finger 22 is provided with pressure compensation opening 28, is arranged in dividing plate 18 In the through hole of the heart, the lower end of guide finger 22 is connected through a screw thread to be fixed together with armature 23, armature 23 by fastening bolt 32 with Bottom plate 25, valve element 26 are linked together, and one layer of pad 30 is disposed between armature 23 and bottom plate 25, and the top of bottom plate 25 is provided with four Relief groove 31, spring base 24 are arranged on the top of bottom plate 25, and its internal side surface is in contact with the side surface of armature 23, The both ends of armature back-moving spring 29 are respectively in annular groove of the dividing plate 18 with spring base 24, and the valve element 26 of the lower section of bottom plate 25 is by valve Core main body, seal band 27 form, and the integral arrangement of valve element assembly 19 is below control valve rod 4.

As shown in figure 3, combustion gas is oriented in fuel gas injection valve in a kind of piezoelectric type of bypass type axial admission, and first, combustion Gas is by the enterprising gas port 33 of valve body 3 vertically into after the guiding of diversion cavity 34, fuel gas flow direction is changed to level side by vertical direction To the surrounding space of valve element assembly 19 being flowed into, due to the presence of the relief groove 31 on bottom plate 25, inside valve element assembly 19 Space connects with space in valve body 3, and a part of combustion gas can be flowed into the inner space of valve element assembly 19, be filled with valve element group immediately Pressure stabilizing cavity 11 at fit 19 inner spaces and the center of valve seat 21, due to the presence in the upper pressure balance hole 28 of guide finger 22, combustion Gas can flow into the superjacent air space of valve element assembly 19, equally be full of the superjacent air space of valve element assembly 19；Remaining combustion gas flows into valve element 26 Top, a part of combustion gas flows into by the axial admission hole 35 on valve element 26, full of having one around multiple-sealed annulus 27 The air inlet ring cavity 36 of depthkeeping degree, another part combustion gas are filled with around the pressure stabilizing cavity 11 and valve element 26 at the both ends of valve seat 21 empty Between.When piezo-electric crystal 2 is not powered on, the surface of valve element 26 fits with the surface of valve seat 21, air inlet ring cavity 36 and valve seat on valve element 26 Ring cavity on 21 near outlet annulus 20 does not connect；After piezo-electric crystal 2 is powered, piezo-electric crystal 2 extends, and amplifies through fluid power amplifier Band movable valve plug assembly 19 moves upwards afterwards, and the surface of valve element 26 departs from the surface of valve seat 21, now air inlet ring cavity 36 and outlet annulus Ring cavity near 20 is connected, the lifting and take a seat of valve element 26 control air inlet ring cavity 36 and the ring cavity near outlet annulus 20 it Between break-make.

In the fuel gas injection valve course of work, when piezo-electric crystal 2 is not powered on, bullet is resetted in guide finger back-moving spring 14, armature Under the pretightning force effect of spring 29, valve element assembly 19 remains motionless in initial position, on the valve element 26 in valve element assembly 19 The upper surface of seal band 27 and valve seat 21 is fitted close, and the air inlet ring cavity 36 on valve element 26 and outlet annulus 20 on valve seat 21 are attached Near ring cavity does not connect, the whole space inside valve body 3 of the combustion gas full of fuel gas injection valve.After piezo-electric crystal 2 is powered, piezo crystals Body 2 is by current excitation so as to extending so that control valve rod 4 moves downward, and big piston 5 moves downward therewith, the liquid in sleeve 8 17 pressure rises are pressed oil, in the presence of the pressure of hydraulic oil 17, valve piston 15 moves upwards, and guide finger 22 is by multiple valve pistons After 15 upward active forces, smoothly motion upwards, a part of the guide finger 22 as valve element assembly 19, valve element assembly 19 Overall motion upwards therewith, now, fuel gas injection valve is opened, and gas circuit is opened, until the pressure of hydraulic oil 17 in sleeve 8 returns to just Beginning state, big piston 5, the stop motion of valve piston 15, the stop motion therewith of valve element assembly 19, valve element assembly 19 is in the position A period of time is maintained, during this, combustion gas is flowed into by the axial admission hole 35 on valve element 26, around multiple-sealed annulus 27 Air inlet ring cavity 36 with certain depth, via the space between valve element 26 and valve seat 21, after being finally oriented to via gas outlet 37 Vertical outflow, multiple tracks annulus, face sealing, voltage stabilizing balance are used between valve element 26 and valve seat 21, and wider annulus area can subtract Shaochong is hit, and improves reliability, valve seat 21 is in the pressure stabilizing cavity 11 set close to the both ends of air inlet ring cavity 36 and its center opening position So that the combustion gas of surrounding is ventilated uniformly in flow process, air pressure balance；After combustion gas ejection is a certain amount of, piezo-electric crystal 2 starts to break Electricity, piezo-electric crystal 2 shorten, and in the presence of big piston support spring 6, big piston 5 starts to move upwards, hydraulic oil in sleeve 8 17 pressure decline, and in the presence of guide finger back-moving spring 14, guide finger 22 starts to move downward, valve piston 15, valve element combination Body 19 is overall together to be moved downward therewith, until the pressure of hydraulic oil 17 returns to original state, big piston 5, valve piston 15 in sleeve 8 Initial position is returned to, now valve element assembly 19 is also corresponding returns to initial position, and the surface of valve element 26 is bonded with the surface of valve seat 21, Initial position is come back to, fuel gas injection valve is closed, and gas circuit is closed.

From the above-mentioned course of work：Gas injection is oriented in a kind of piezoelectric type of bypass 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, combined via fluid power amplifier displacement enlargement pusher movable valve plug The guide finger 22 of body 19 moves, and the entirety of valve element assembly 19 is between guide finger 22 and dividing plate 18 under the interior guide effect of mating surface Lift off a seat 21 motions, realize the function of gas valve jet；The utility model is effectively carried by the way of the driving of piezo-electric crystal 2 The high response speed of fuel gas injection valve, by the different current driver mode of piezo-electric crystal 2, realize the liter of fuel gas injection valve Journey is variable；The utility model is oriented to using the plenum system of bypass to flowing of the combustion gas in valve body 3；The bottom of valve element 26 End is using seal band 27 and then forms air inlet ring cavity 36, and combustion gas enters axially into, and on the one hand avoids combustion gas interference, ensure that Gas circuit balances, and on the other hand alleviates the mass of valve seat 21, improves response speed；The utility model is used with pressure stabilizing cavity 11 The structure of valve seat 21, it can effectively inhibit the fluctuation of gaseous-pressure inside fuel gas injection valve, ensure that fuel gas injection valve jet The stability of pressure；The utility model is provided with pressure compensation opening 28 at guide finger 22, and there is provided pressure at bottom plate 25 to put down Weigh groove 31, promotes gas circuit inside and outside valve element assembly 19 to reach balance, ensure that valve element assembly is poor without gaseous-pressure about 19, keep away Valve element assembly 19 is exempted from by extra axial force, further increasing the response speed of fuel gas injection valve, reduce combustion The control difficulty of gas jet valve work.

Fuel gas injection valve, including fixed block, piezoelectricity are oriented in a kind of piezoelectric type of bypass type axial admission of the utility model Crystal, valve body, control valve rod, big piston, big piston support spring, sealing ring, sleeve, O-ring seal, bolt, guide finger Back-moving spring, valve piston, valve piston support spring, valve element assembly and valve seat, valve body are a cuboid, close to its center one End is provided with the air inlet and diversion cavity of combustion gas, and certain depth is provided with vertically in the other end close to valve body center Hole, is separated with the dividing plate of certain depth among holes, and the hole space below dividing plate is connected with diversion cavity, and fixed block is using positioning spiral shell Bolt links together itself and valve body, the center for making its own be fixed on dividing plate upper aperture top, in fixed block and valve body Between mating surface on keep sealing by O-ring seal, fixed block is provided with the straight trough of certain depth, piezoelectricity in center Crystal is arranged therein, and the less through hole of a diameter is provided with above straight trough, for arranging piezo-electric crystal and valve body outer control list Member is connected wires, and close arrangement has control valve rod below piezo-electric crystal, controls the lower surface of valve rod to connect with big piston upper surface Touch, under the pretightning force effect of guide finger back-moving spring, big piston support spring, piezo-electric crystal lower surface and control valve rod upper table Together with face, control valve rod lower surface are brought into close contact with big piston upper surface, sleeve upper end is two to export, and is one slightly to go out respectively Mouth and a thin outlet, lower end are a closing chamber connected, and the lower end of big piston is arranged in the thick outlet of sleeve, big piston support Spring ensures that big piston integrally will not enter in sleeve, is filled with sleeve with one between big plunger flange and sleeve The hydraulic oil of constant-pressure, the thin outlet top of sleeve are disposed with valve piston, and valve piston lower end is arranged therein, in valve piston flange Valve piston support spring is disposed between sleeve, to ensure that valve piston integrally will not enter in sleeve, big piston, valve piston side Sealing ring is disposed between surface and sleeve lining, to prevent the leakage of hydraulic oil in sleeve, big piston, valve piston, big piston Support spring, valve piston support spring have together constituted with the fluid power amplifier of piezo-electric crystal with sleeve, and fluid power amplifier is as one Individual integral arrangement has been sequentially arranged valve element combination from top to bottom in the top of valve body median septum, control valve rod below center Body, valve seat, under the pretightning force effect of valve piston support spring, valve piston upper surface and the upper end of valve element assembly are closely pasted Close, be provided with bolt hole on 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 guide finger, armature, armature back-moving spring, spring base, bottom plate, valve element, pad and tight Fixing bolt forms, and to ensure that guide finger is smoothly moved, is disposed with multiple sleeves thereunder, corresponding multiple valve pistons are symmetrical It is arranged in below guide finger, number is even number, in the presence of valve piston support spring, valve piston upper surface and valve element group Guide finger lower surface in zoarium is brought into close contact, and guide pin centre is provided with pressure compensation opening, is arranged in the through hole at dividing plate center, Guide finger lower end is fixed together by screw thread and armature, and armature is linked together by fastening bolt and bottom plate, valve element, One layer of pad is disposed between armature and bottom plate, four relief grooves are provided with above bottom plate, spring base is arranged on the upper of bottom plate Side, its internal side surface are in contact with the side surface of armature, and the both ends of armature back-moving spring are located at dividing plate and spring base respectively Annular groove in, the valve element below bottom plate is made up of valve element main body, seal band, valve element assembly integral arrangement control valve rod Lower section；Combustion gas is by the enterprising gas port of valve body vertically into after diversion cavity is oriented to, fuel gas flow direction is changed to level by vertical direction Direction, flow into valve element assembly surrounding space, due to the presence of the relief groove on bottom plate, valve element assembly inner space with Space connects in valve body, and a part of combustion gas can be flowed into valve element assembly inner space, be filled with immediately inside valve element assembly Pressure stabilizing cavity at space and valve seat center, due to the presence in guide finger upper pressure balance hole, combustion gas can flow into valve element assembly Superjacent air space, equally it is full of valve element assembly superjacent air space；Remaining combustion gas flows into the top of valve element, and a part of combustion gas is by valve element Air admission hole flow into, full of the air inlet ring cavity with certain depth around multiple-sealed annulus, another part combustion gas is filled with The surrounding space of pressure stabilizing cavity and valve element at valve seat both ends.When piezo-electric crystal is not powered on, spool face is affixed with valve base surface Close, the air inlet ring cavity on valve element does not connect with the ring cavity of outlet adjacent annular bands on valve seat；After piezo-electric crystal is powered, piezo-electric crystal is stretched Long, 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 It is connected with the ring cavity of outlet adjacent annular bands, lifting and taking a seat for valve element controls the ring cavity of air inlet ring cavity and outlet adjacent annular bands Between break-make.

Claims (3)

1. fuel gas injection valve is oriented in a kind of piezoelectric type of bypass type axial admission, it is characterized in that：Including valve body, valve seat, piezoelectricity Crystal, fluid power amplifier, dividing plate, valve element assembly, valve body are fixedly arranged above fixed block, straight trough, piezoelectricity are provided with the middle part of fixed block Crystal is arranged in straight trough, and valve body is fixed on valve seat, and dividing plate is set in valve body, and fluid power amplifier is set above dividing plate, valve element Assembly is arranged on below dividing plate, sets through hole on dividing plate respectively, and valve space, institute are formed between the valve body and valve seat below dividing plate Stating fluid power amplifier includes big piston, valve piston, sleeve, and sleeve is arranged on dividing plate, and the end set of sleeve upper end slightly exports, Sleeve upper end tip inside sets thin outlet, and big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, big piston Big piston support spring is set between flange and sleeve, valve piston support spring is set between the flange and sleeve of valve piston, greatly Filled with hydraulic oil in sleeve below piston, valve piston, guide finger passes through the through hole of dividing plate, and the top of guide finger sets control valve Bar, guide finger back-moving spring is set between guide finger and control valve rod, the upper surface and piezo-electric crystal for controlling valve rod are fitted in one Rise, the lower surface and big piston upper surface for controlling valve rod fit together, and valve piston upper surface fits together with guide finger, institute The valve element assembly stated includes armature, spring base, bottom plate, valve element, and armature, bottom plate, valve element are arranged while by tight from top to bottom Fixing bolt links together, and spring base is located at outside armature and annular groove is formed between armature, and dividing plate lower surface sets annular Groove, the both ends of armature back-moving spring are arranged in the annular groove of dividing plate and the annular groove of spring base, guide finger and armature phase It is fixed, pressure compensation opening is set in guide finger, 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, sets outlet annulus on valve seat, go out compression ring on valve element Band sets gas outlet below air inlet ring cavity below outlet annulus.

2. fuel gas injection valve is oriented in a kind of piezoelectric type of bypass 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, its feature are oriented in a kind of piezoelectric type of bypass type axial admission according to claim 1 or 2 It is：Extension is set on valve body, extension sets air inlet, sets diversion cavity in the valve body below air inlet, air inlet, Diversion cavity is communicated and forms exterior space, and exterior space communicates with inner space, and axial admission hole is set on valve element；

Combustion gas vertically flows into diversion cavity through air inlet, and a part of combustion gas is flowed into the center pressure stabilizing cavity of inner space and valve seat, Remaining combustion gas is flowed into above valve element, and a part of combustion gas stream is through axial air admission hole, full of the air inlet ring cavity on valve element, another part combustion Gas is flowed into the end pressure stabilizing cavity of valve seat outer end；

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, guide finger is also moved upwards, and band movable valve plug assembly is moved upwards, and fuel gas injection valve is opened, and gas circuit is opened, until in sleeve Hydraulic fluid pressure return to original state, big piston and valve piston no longer move, and valve element assembly stops therewith, and combustion gas is by valve element On axial admission hole flow into, pass through air inlet ring cavity, the space between valve element and valve seat, after being finally oriented to via gas outlet Vertical outflow；After piezo-electric crystal power-off, piezo-electric crystal shortens, and in the presence of big piston support spring, big piston returns to initially Position, hydraulic fluid pressure declines in sleeve, and in the presence of guide finger back-moving spring, guide finger moves downward, valve piston, valve element Assembly moves downward therewith, until hydraulic fluid pressure returns to original state in sleeve, big piston, valve piston return to initial bit Put, valve element assembly 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.