CN206816392U - Fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat - Google Patents

Abstract

The purpose of this utility model, which is to provide in a kind of piezoelectric type of the through type with floating valve seat, is oriented to fuel gas injection valve, pass through floating valve seat structure, realization avoids, due to reverse leakage function caused by fuel gas injection valve external and internal pressure imbalance, ensure that the reliability of fuel gas injection valve work；Air inlet and water conservancy diversion process are realized by bypass structure and water conservancy diversion cavity configuration；The control of valve element is realized by the control of piezo actuator, the control of gas circuit, realizes air injection function；It is engaged by interior guide frame with pressure compensation opening, relief groove, ensures the perpendicularity of valve element, realize the steady operation of air-flow, reliably working, realize high response speed；By the axially mixed admission mode of the main direct air inlet of air drain and circumferential tonifying Qi gas inlet hole, big flow is realized, effectively improves the jet efficiency of engine, while air-flow can be avoided to interfere, realize the stabilization of gas circuit；By valve element and the multiple tracks zonary structure of valve base chamber, the face sealing of fuel gas injection valve, high reliability are realized.

Description

Fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat

Technical field

The utility model relates to the combustion gas of a kind of fuel gas injection valve, specifically natural gas engine gas system Injection valve.

Background technology

With increasingly strict and fuel price constantly soaring, gas machine and the dual fuel engine of ship Abgasgesetz Status in the international market is more and more important.Fuel injection system as gas machine, the key components and parts of dual fuel engine, Its performance directly affects the dynamic property and emission performance of engine.Fuel gas injection valve is that gaseous fuel electric controlled multi-point gas injection machine contains One of kernel component of double fuel machine, achievable each cylinder supplies by stages at regular time and quantity and charge stratification, and its service behaviour is to gas The dynamic property of body machine or dual fuel engine, emission performance have highly important influence.In the case where engine operating condition is severe, Easily there is the situation of reverse leakage in injection valve.Meanwhile in order to realize more flexible gas puff Z-pinch.Therefore, it is necessary to design one kind Injection valve with anti-reverse leakage function and variable lift.Simultaneously, it is necessary to which Development response speed is fast, control accuracy is high, reliable The good big flow fuel gas injection valve of property, enables its negotiability to meet natural gas engine normal work need at high load conditions Ask.

The content of the invention

The purpose of this utility model be to provide fast response time, fuel gas injection it is stable, it is highly reliable, there is anti-reverse let out Leak in a kind of piezoelectric type of the through type with floating valve seat of function and be oriented to fuel gas injection valve.

What the purpose of this utility model was realized in：

Fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat of the utility model, it is characterized in that：Including Valve body, floating valve seat, piezo-electric crystal, control valve rod, fluid power amplifier, dividing plate, valve element assembly, the inner upper of valve body are fixed There is fixed block, straight trough is provided with the middle part of fixed block, piezo-electric crystal is arranged in straight trough, and dividing plate is set in the middle part of valve body, is set above dividing plate Fluid power amplifier is put, valve element assembly is set below dividing plate, through hole and passage, the fluid power amplifier are set respectively on dividing plate Including big piston, valve piston, sleeve, sleeve is arranged on dividing plate, and the end set of sleeve upper end slightly exports, sleeve upper end end Inner side sets thin outlet, and big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, the flange and sleeve of big piston it Between big piston support spring is set, valve piston support spring is set between the flange and sleeve of valve piston, under big piston, valve piston Filled with hydraulic oil in the sleeve of side, guide finger passes through the through hole of dividing plate, and the top of guide finger sets control valve rod, guide finger and control Auxiliary back-moving spring is set between valve rod processed, and the upper surface and piezo-electric crystal for controlling valve rod fit together, and control the following table of valve rod Face fits together with big piston upper surface, and valve piston upper surface fits together with guide finger, described valve element assembly bag Armature, spring base, bottom plate, valve element are included, armature, bottom plate, valve element are arranged while linked together by fastening bolt from top to bottom, Spring base is located at outside armature and annular groove is formed between armature, dividing plate lower surface setting annular groove, and the two of master reset spring End is arranged in the annular groove of dividing plate and the annular groove of spring base, and guide finger is mutually fixed with armature, and pressure is set in guide finger Dynamic balance hole, sets relief groove on bottom plate, and valve element is hollow structure, pressure compensation opening, relief groove, valve element it is hollow Part is communicated, and seal band is set on valve element, and seal band forms ring cavity；The floating valve seat includes guide base, valve seat, leads The lower section of valve body is fixed on to pedestal, valve seat is located at below valve element, and guide base inner ring is provided with T-shaped structure, and valve seat outer ring leads to Cross and set the T-shaped structure coordinated with it to be arranged in guide base, the both ends of valve seat back-moving spring are separately fixed at valve seat and valve On core, outlet annulus is set, outlet annulus is located at below ring cavity, and gas outlet is set below outlet annulus on valve seat.

The utility model can also include：

The 1st, double anti-gas-leak structure is set between valve seat and guide base, the first heavy anti-gas-leak structure is in valve seat and led Installation deformable seal circle above to pedestal junction, deformable seal circle interior edge top install packing washer, the second leakproof again additional Depressed structure is to set two layers of O-ring seal in the T-shaped structure junction of valve seat and guide base, between valve seat and guide base T-shaped structure junction set elastic washer.

2nd, air inlet, air inlet diversion cavity formed below are formed between the top of fixed block and valve body, diversion cavity passes through logical Stomata connects dividing plate underlying space；

Gas is vertically flowed into valve body by air inlet, is flowed into along diversion cavity and is full of valve inner, after piezo-electric crystal is powered, Motion is separated valve element with valve base surface upwards, and gas circuit is opened, and gas valve is opened, and gas is by the main air drain in axial direction and circumferential tonifying Qi hole Mixed admission mode flows into, and by ring cavity, is vertically flowed out by gas outlet；Piezo-electric crystal powers off, in the presence of master reset spring, Armature band movable valve plug moves downward, until spool face is bonded with valve base surface, returns to initial position, gas circuit is closed, combustion gas Valve is closed.

Advantage of the present utility model is：The utility model uses the structure with floating valve seat, and it can effectively prevent from firing There is the situation of reverse leakage and the function with damping in gas jet valve, ensure that the reliability and safety of fuel gas injection valve work Property；The utility model by opening pressure compensation opening in guide pin centre and a number of relief groove being provided with bottom plate, Armature is avoided to be made airline pressure inside and outside at armature be more easy to reach balance by axial force, improve armature response speed；This practicality is new Type increases circulation area, reduces valve element quality, improve reliability by opening circumferential tonifying Qi hole on four ribs of valve element.In valve The diversion angle of cone of certain angle is set at core circumference tonifying Qi hole, reduces flow losses, increases discharge coefficient.The utility model uses The axially mixed admission mode of the main direct air inlet of air drain and circumferential tonifying Qi gas inlet hole, increase charge flow rate coefficient, increase air inflow, Air-flow can be avoided to interfere simultaneously, gas circuit is reached balance.It is effectively improved the jet efficiency of engine.

Brief description of the drawings

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

Fig. 2 is valve element composite unit structure schematic diagram of the present utility model；

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

Fig. 4 is valve core structure top view；

Fig. 5 is valve core structure tomograph；

Fig. 6 is floating valve seat schematic enlarged-scale view；

Fig. 7 is floating valve seat force diagram.

Embodiment

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

With reference to Fig. 1-7, Fig. 1 is that the whole of fuel gas injection valve is oriented in piezoelectric type of the utility model through type with floating valve seat Body structural representation, including valve body 1, piezo actuator 3, valve element assembly 15, floating valve seat 17 4 are most of.Piezo actuator 3 are linked together by upper square thread and valve body 1.It has been sequentially arranged valve element assembly from top to bottom below piezo actuator 15th, floating valve seat 17.

Piezo actuator 3 is made up of piezo-electric crystal 2, control valve rod 4, fluid power amplifier, auxiliary back-moving spring 9, wherein fluid power Amplifier is made up of big piston 5, big piston support spring 6, valve piston 10, valve piston support spring 11 and sleeve 8, fluid power amplification Device is arranged in the top of dividing plate 13 on valve body, and the fuel oil of certain pressure, big piston 5, valve piston 10 and sleeve 8 are covered with sleeve 8 Between mating surface be equipped with sealing ring 7；The arranged beneath of piezo-electric crystal 2 has control valve rod 4, controls lower surface and the liquid of valve rod 4 The upper surface of big piston 5 in power amplifier is in contact, and the large and small piston in fluid power amplifier has been arranged symmetrically four, big In the presence of piston support spring 6, piezo-electric crystal 2, control valve rod 4, big piston 5 are brought into close contact together, in fluid power amplifier Valve piston 10 it is brought into close contact with the lower surface of guide finger 18 using valve piston support spring 11, the upper surface of guide finger 18 arrangement There is auxiliary back-moving spring 4.

Fig. 2 is valve element assembly 15 mainly by guide finger 9, armature 19, spring base 20, fastening bolt 27, pad 25, bottom plate 21st, valve element 22 forms.It is characterized in that：Armature 19, pad 25, bottom plate 21 and valve element 22 are linked together by fastening bolt 27, Spring base 20 is arranged on bottom plate 21.The center of guide finger 9 is provided with pressure compensation opening 24, and a number of pressure is provided with bottom plate 21 Compensating groove 26, armature 19 is avoided to be made airline pressure inside and outside at armature 19 be more easy to reach balance by axial force, improve the sound of armature 19 Answer speed；Guide finger 9 is fixed together by screw thread and armature 19.Master reset spring 14 between dividing plate 5 and spring base 20, Auxiliary back-moving spring 8 is located between guide finger 9 and control valve rod 4.Piezo-electric crystal 2 be powered after, piezo-electric crystal 2 by current excitation from And extend so that control valve rod 4 moves downward, and the big piston 5 on fluid power amplifier moves downward therewith, is covered in fluid power amplifier Fluid pressure rise in cylinder 8, in the presence of fluid pressure, the valve piston on fluid power amplifier moves upwards, guide finger 18 After the upward active force of four valve pistons 10, smoothly motion upwards, one as valve element assembly 15 of guide finger 18 Point, the overall motion upwards therewith of valve element assembly 15, in whole motion process, the axial movement of armature 19 with it is circumferentially positioned by Cooperation between guide finger 9 and dividing plate 5 realizes to control, until the upper surface of spring base 20 is in contact with the lower surface of dividing plate 5, After armature 19 maintains a period of time in the position, piezo-electric crystal 2 powers off, and piezo-electric crystal 2 starts to shorten, in big piston support spring In the presence of 6, big piston 5 starts to move upwards, and fluid pressure declines in the sleeve 8 in fluid power amplifier, in major-minor reset bullet In the presence of spring, guide finger 18 starts to move downward, and valve piston 10, valve element assembly 15 are overall together to be moved downward therewith, directly Pressure returns to original state in fluid power amplifier, and big valve piston returns to initial position, and now valve element assembly 15 is also corresponding Initial position is returned to, gas circuit is closed, and gas valve is closed.

Open 2 circumferential tonifying Qi holes 33 respectively on four fins 29 of valve element 22, improve response speed, increase circulating face Product, while quality can be also reduced, improve reliability.The diversion angle of cone of certain angle is set at circumferential tonifying Qi hole 33, reduces stream Dynamic loss, increases discharge coefficient.Using the mixed admission mode of axially main 35 direct air inlet of air drain and the circumferential air inlet of tonifying Qi hole 33, Increase charge flow rate coefficient, increase air inflow, while air-flow can be avoided to interfere, gas circuit is reached balance.Valve element 22 and valve seat Outlet annulus 16, face sealing, voltage stabilizing balance are used between 39, and wider annulus area can reduce impact, improve reliability.

Gas circuit is flowed into along diversion cavity 31 and is full of valve body 1 as shown in figure 4, gas is vertically flowed into valve body 1 by air inlet 30 Inside, after piezo-electric crystal 2 is powered, gas valve is opened, and gas is by the axially mixed admission side in main air drain 35 and circumferential tonifying Qi hole 33 Formula flows into, and by ring cavity 32, is finally vertically flowed out by gas outlet 34；Piezo-electric crystal 2 is powered off, and rank gas valve is closed.

As shown in figure 3, in order to prevent combustion gas reverse leakage, the reliability and security of fuel gas injection valve, this practicality are improved It is new to employ the structure of floating valve seat 17.Floating valve seat 17 can be when gas valve external pressure height be with air pressure inside by gas valve It is locked, it effectively prevent the reverse leakage of combustion gas.Floating valve seat 17 is made up of 7 parts：Guide base 37, valve seat 39 and valve Seat back-moving spring 43, O-ring seal 38, packing washer 24, deformable seal circle 41, elastic washer 42.Guide base 37 passes through spiral shell Bolt is fixed on valve body 1, and valve seat 39 is arranged on guide base 37.The inner ring of guide base 37 is carried outside T-shaped structure, with valve seat 39 The T-shaped structure of circle is engaged.The both ends of valve seat back-moving spring 43 are separately fixed on valve seat 39 and valve element 22, and keep necessarily pre- Clamp force.

In order to prevent gas leakage between valve seat 39 and guide base 37, installed additional between valve seat 39 and guide base 37 double Anti-gas-leak structure, the first weight anti-gas-leak structure are the installation deformable seal circles above valve seat 39 and the junction of guide base 37 41, the outer of deformable seal circle 41 is pressed in the mounting groove on guide base 37 and valve body 1, passes through guide base 37 and valve body Bolt pretightening between 1 is fixed.Install packing washer 24 above the interior edge of deformable seal circle 41 additional, valve seat is fixed on by screw 40 On 39, packing washer 24 ensures uniform force, strengthens sealing.The material of deformable seal circle 41 uses deformable soft modeling Material, ensures that it does not influence the motion of valve seat 39.Second resealing is installed additional in the T-shaped junction of valve seat 39 and guide base 37 Two layers of O-ring seal 38, further enhances sealing.T-shaped junction between valve seat 39 and guide base 37 has installed one layer additional Elastic washer 42, vibratory impulse power during contact is reduced, serves the effect of damping.Effectively increase the reliable of gas valve Property.

Valve seat 39 is by combustion gas inside the elastic force F4 of valve seat back-moving spring 43, gas valve the external gas pressure F1 and F2, gas valve Pressure F3 and the thrust of valve element 22 effect.The elastic force of 22 acceptor's back-moving spring of valve element 14 acts on.Air pressure is more than below gas valve Gas valve air pressure inside, gas valve the external gas pressure F1, F2 are respectively acting at the lower section of valve seat 39 and outlet annulus 16, valve seat 39 lower contact areas are much larger than outlet annulus 16, and therefore, F1 is much larger than F2, and being expanded in the external gas pressure causes valve element 22 Upwards before motion, the external gas pressure overcomes the initial tension of spring of master reset spring 14, valve seat 39 together with valve element 22 to Upper motion.Valve seat 39 is moved upwardly until that spring base 20 is in contact with dividing plate 13.Even if now piezo-electric crystal 2 is powered, valve element 22 Also can not move upwards, gas valve can not be opened.Gas valve is locked.

When gas valve inner and outer air pressure recovers normal, valve seat 39 moves back down in the presence of valve seat back-moving spring 43 It is in situ.If now piezo-electric crystal 2 is powered, valve element 22 still remains stationary as, and gas valve is normally-open.Want to press during closing gas valve Electric crystal 2 is powered off, and valve element 22 moves downward in the presence of master reset spring 14, and gas valve is closed.If now piezo-electric crystal 2 It is not powered on, valve seat 39 moves back down to original position together with valve element 22 in the presence of master reset spring 14, and gas valve keeps closing Close.When wanting to open gas valve, piezo-electric crystal 2 is powered, and valve element 22 moves upwards, and gas valve is normally-open.

From the above-mentioned course of work, interior guiding fuel gas injection valve of the utility model through type with floating valve seat 17 uses Structure with floating valve seat 17, it is anti-that it can effectively prevent that fuel gas injection valve from occurring in the case of injection valve inner and outer air pressure exception Situation to leakage and the function with damping, ensure that the reliability and safety of fuel gas injection valve work；Meanwhile this practicality It is new by opening pressure compensation opening 24 at the center of guide finger 9 and a number of relief groove 26 being provided with bottom plate 21, keep away Exempt from armature 19 by axial force, make airline pressure inside and outside at armature 19 be more easy to reach balance, improve the response speed of armature 19；In valve The structure in circumferential tonifying Qi hole 33 is opened on four fins 29 of core 22, increases circulation area, reduces the mass of valve element 22, is improved reliable Property.The diversion angle of cone of certain angle is set at the circumferential tonifying Qi hole 33 of valve element 22, reduces flow losses, increases discharge coefficient.This Utility model increases charge flow rate using the axially mixed admission mode of main 35 direct air inlet of air drain and the circumferential air inlet of tonifying Qi hole 33 Coefficient, increase air inflow, while air-flow can be avoided to interfere, gas circuit is reached balance.It is effectively improved the jet of engine Efficiency.

The technical solution of the utility model：Fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat, it It is made up of valve body, piezo actuator, valve element assembly, the major part of floating valve seat four.Piezo actuator by square thread thereon with Valve body links together.Piezo actuator is made up of piezo-electric crystal, control valve rod, fluid power amplifier, auxiliary back-moving spring, wherein liquid Power amplifier is made up of big piston, big piston support spring, valve piston, valve piston support spring and sleeve, fluid power amplifier cloth Put above the dividing plate on valve body, the fuel oil of certain pressure, the mating surface between big piston, valve piston and sleeve are covered with sleeve It is equipped with sealing ring 7；Piezo-electric crystal arranged beneath has control valve rod, controls the lower surface of valve rod and the big work in fluid power amplifier Surface is in contact beyond the Great Wall, and the large and small piston in fluid power amplifier has been arranged symmetrically four, in the effect of big piston support spring Under, piezo-electric crystal, control valve rod, big piston are brought into close contact together, and the valve piston in fluid power amplifier is supported using valve piston Spring makes it be brought into close contact with guide finger lower surface, and guide finger upper surface is disposed with auxiliary back-moving spring.Below piezo actuator Valve element assembly, floating valve seat have been sequentially arranged from top to bottom.Valve element assembly is mainly by armature, spring base, fastening bolt, pad Piece, bottom plate, valve element composition.Armature, pad, bottom plate and valve element are linked together by fastening bolt, and spring base is arranged on bottom plate On, a number of relief groove is provided with bottom plate.Master reset spring between dividing plate and spring base, open by guide pin centre There is pressure compensation opening.Open a circumferential tonifying Qi hole respectively on the rib of valve element.Valve element and valve base chamber say compression ring band using three, and face is close Envelope, voltage stabilizing balance, and there is wider annulus area.Floating valve seat is by guide base, valve seat and valve seat back-moving spring, close Sealing rubber ring, packing washer, deformable seal circle, elastic washer composition.Guide base is bolted on valve body, valve seat peace On guide base.Guide base inner ring carries T-shaped structure, is engaged with the T-shaped structure of valve seat outer ring.Valve seat back-moving spring Both ends are separately fixed on valve seat and valve element, and keep certain pretightning force.Installed additional between valve seat and guide base double Anti-gas-leak structure, the first heavy anti-gas-leak structure is the installation deformable seal circle above valve seat and guide base junction, variable Shape sealing ring outer is pressed in the mounting groove on guide base and valve body, passes through the bolt pretightening between guide base and valve body It is fixed.Install packing washer above deformable seal circle interior edge additional, be screwed on valve seat.The material of deformable seal circle Using deformable flexible plastic, ensure that it does not influence the motion of valve seat.Second resealing is connected in the T-shaped of valve seat and guide base The place of connecing has installed two layers of O-ring seal additional.

Claims (3)

1. fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat, it is characterized in that：Including valve body, float trap Seat, piezo-electric crystal, control valve rod, fluid power amplifier, dividing plate, valve element assembly, the inner upper of valve body are fixed with fixed block, Gu Determine to be provided with straight trough in the middle part of block, piezo-electric crystal is arranged in straight trough, and dividing plate is set in the middle part of valve body, sets fluid power to amplify above dividing plate Device, dividing plate lower section set valve element assembly, set through hole and passage on dividing plate respectively, and the fluid power amplifier includes big living Plug, valve piston, sleeve, sleeve are arranged on dividing plate, and the end set of sleeve upper end slightly exports, and sleeve upper end tip inside is set Thin outlet, big piston are arranged in thick outlet, and valve piston is arranged in thin outlet, are set between the flange and sleeve of big piston big Piston support spring, valve piston support spring is set, the sleeve below big piston, valve piston between the flange and sleeve of valve piston In filled with hydraulic oil, guide finger passes through the through hole of dividing plate, and the top of guide finger sets control valve rod, guide finger and control valve rod it Between auxiliary back-moving spring is set, the upper surface and piezo-electric crystal for controlling valve rod fit together, control the lower surface of valve rod with it is big living Surface fits together beyond the Great Wall, and valve piston upper surface fits together with guide finger, and described valve element assembly includes armature, bullet Spring abutment, bottom plate, valve element, armature, bottom plate, valve element arrange while linked together by fastening bolt from top to bottom, spring seat Annular groove is formed outside armature and between armature, dividing plate lower surface sets annular groove, the both ends difference cloth of master reset spring To put in the annular groove of dividing plate and the annular groove of spring base, guide finger is mutually fixed with armature, and pressure compensation opening is set in guide finger, Relief groove is set on bottom plate, valve element is hollow structure, and pressure compensation opening, relief groove, the hollow space of valve element communicate, Seal band is set on valve element, and seal band forms ring cavity；The floating valve seat includes guide base, valve seat, and guide base is solid Be scheduled on the lower section of valve body, valve seat is located at below valve element, and guide base inner ring is provided with T-shaped structure, valve seat outer ring by set with Its T-shaped structure coordinated is arranged in guide base, and the both ends of valve seat back-moving spring are separately fixed on valve seat and valve element, valve seat Upper setting outlet annulus, outlet annulus are located at below ring cavity, and gas outlet is set below outlet annulus.

2. fuel gas injection valve is oriented in a kind of piezoelectric type of the through type with floating valve seat according to claim 1, its feature It is：Double anti-gas-leak structure is set between valve seat and guide base, and the first heavy anti-gas-leak structure is in valve seat and guide base Installation deformable seal circle above junction, deformable seal circle interior edge top install packing washer, the second heavy anti-gas-leak structure additional It is that two layers of O-ring seal, the T-shaped knot between valve seat and guide base are set in the T-shaped structure junction of valve seat and guide base Structure junction sets elastic washer.

3. being oriented to fuel gas injection valve in a kind of piezoelectric type of the through type with floating valve seat according to claim 1 or 2, it is special Sign is：Air inlet, air inlet diversion cavity formed below are formed between the top of fixed block and valve body, diversion cavity is connected by passage Logical dividing plate underlying space；

Gas is vertically flowed into valve body by air inlet, is flowed into along diversion cavity and is full of valve inner, after piezo-electric crystal is powered, valve element Upwards motion separated with valve base surface, gas circuit open, gas valve open, gas by axial direction main air drain and circumferential tonifying Qi hole mixing Intake method flows into, and by ring cavity, is vertically flowed out by gas outlet；Piezo-electric crystal powers off, in the presence of master reset spring, armature Band movable valve plug moves downward, until spool face is bonded with valve base surface, returns to initial position, gas circuit is closed, and gas valve closes Close.