CN107420226A - Fuel gas injection valve is oriented in a kind of piezoelectric type of the bypass type with floating valve seat - Google Patents
Fuel gas injection valve is oriented in a kind of piezoelectric type of the bypass type with floating valve seat Download PDFInfo
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- CN107420226A CN107420226A CN201710504592.4A CN201710504592A CN107420226A CN 107420226 A CN107420226 A CN 107420226A CN 201710504592 A CN201710504592 A CN 201710504592A CN 107420226 A CN107420226 A CN 107420226A
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- valve seat
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- valve element
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0251—Details of actuators therefor
- F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
- F02M21/026—Lift valves, i.e. stem operated valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrically Driven Valve-Operating Means (AREA)
Abstract
It is an object of the invention to provide be oriented to fuel gas injection valve in a kind of piezoelectric type of the bypass type with floating valve seat, 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 by-pass 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 the function of gas valve jet；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 supply 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
Technical field
The present invention relates to a kind of fuel gas injection valve, specifically natural gas engine gas injection valve.
Background technology
In recent years, with the rapid growth that China's oil consumes, oil heavy dependence import.Combustion of natural gas clean and
In China's rich reserves, the fuel of most possible diesel oil substitute is become.Natural gas engine is especially made as ship power
There is good application prospect for the thrust power of riverboat.As the fuel supply system of natural gas engine, fuel gas injection
The performance of valve directly determines the economy and discharge performance of natural gas engine.At present, natural gas engine is in full working scope state
Lower work has the insufficient situation of gas quantity often, causes the rotary speed unstabilization phenomenon during operation of engine full working scope, in big work(
Can be more serious on rate engine, this drastically influence the normal use of engine and the performance of engine.In engine operating condition
In the case of severe, easily there is the situation of reverse leakage in injection valve.Meanwhile in order to realize more flexible gas puff Z-pinch.Therefore,
Need to design a kind of injection valve with anti-reverse leakage function and variable lift.Simultaneously, it is necessary to which Development response speed is fast, controls
Precision is high, the big flow fuel gas injection valve of good reliability, enables its negotiability to meet natural gas engine in higher load condition
Lower normal work demand.
The content of the invention
It is an object of the invention to provide fast response time, control accuracy height, reliability height, stable gas pressure, it is efficient sealed,
Fuel gas injection valve is oriented in big flow, a kind of piezoelectric type of the bypass type with floating valve seat with anti-reverse leakage function.
The object of the present invention is achieved like this：
Fuel gas injection valve is oriented in a kind of piezoelectric type of the bypass type with floating valve seat of the present invention, 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, valve body top is hatch frame, opening
Fixed block is fixed with structure, 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,
Fluid power amplifier is set above dividing plate, valve element assembly is set below dividing plate, through hole, the fluid power amplification are set respectively on dividing plate
Device 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 end
Thin outlet is set on the inside of portion, and big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, the flange and sleeve of big piston
Between big piston support spring is set, between the flange and sleeve of valve piston set valve piston support spring, big piston, valve piston
Filled with hydraulic oil in the sleeve of lower section, guide finger passes through the through hole of dividing plate, and the top of guide finger sets control valve rod, guide finger with
Auxiliary back-moving spring is set between control valve rod, the upper surface and piezo-electric crystal for controlling valve rod fit together, and control under valve rod
Surface fits together with big piston upper surface, and valve piston upper surface fits together with guide finger, described valve element assembly
Including armature, spring base, bottom plate, valve element, armature, bottom plate, valve element are arranged while are connected to one by fastening bolt from top to bottom
Rise, spring base is located at outside armature and annular groove is formed between armature, and dividing plate lower surface sets annular groove, master reset spring
Both ends are arranged in the annular groove of dividing plate and the annular groove of spring base, and guide finger is mutually fixed with armature, is set in guide finger
Pressure compensation opening, sets relief groove on bottom plate, and valve element is hollow structure, in pressure compensation opening, relief groove, valve element
Empty 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,
Guide base is fixed in valve body, and valve seat is located at below valve element, and guide base inner ring is provided with T-shaped structure, and valve seat outer ring passes through
The T-shaped structure coordinated with it is set to be arranged in guide base, the both ends of valve seat back-moving spring are separately fixed at valve seat and valve element
On, outlet annulus is set on valve seat, and outlet annulus is located at below ring cavity, and gas outlet is set below outlet annulus.
The present invention 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.
The 2nd, air inlet is set on valve body, air inlet is located at the outwardly directed part of valve body, air inlet diversion cavity formed below,
Air inlet, diversion cavity communicate；
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,
By current excitation so as to extending so that control valve rod moves downward, and big piston moves downward therewith, hydraulic fluid pressure rise,
Valve piston moves upwards, and guide finger is moved upwards by after the upward active force of valve piston, and valve element assembly is overall upward therewith
Motion, motion separates band movable valve plug with valve base surface upwards, until the upper surface of spring base is in contact with the lower surface of dividing plate, gas
Road is opened, and gas valve is opened, and gas is flowed into by the mixed admission mode in axially main air drain and circumferential tonifying Qi hole, by ring cavity, by
Vertically flow out gas outlet；Shorten after piezo-electric crystal power-off, in the presence of big piston support spring, big piston upwards, liquid
Oil pressure declines, and in the presence of major-minor back-moving spring, guide finger moves downward, and valve piston, valve element assembly are overall therewith
Together move downward, until hydraulic fluid pressure returns to original state, big piston, valve piston return to initial position, valve element assembly
Initial position is returned to, gas circuit is closed, and gas valve is closed.
Advantage of the invention is that：The present invention uses the structure with floating valve seat, and it can effectively prevent fuel gas injection valve
There is the situation of reverse leakage and the function with damping, ensure that the reliability and safety of fuel gas injection valve work；Pass through
By-pass structure and the structure of diversion cavity 31 realize air inlet and water conservancy diversion process；The control of valve element is realized by the control of piezo actuator,
The control of gas circuit, realize the function of gas valve jet；It is engaged by interior guide frame with pressure compensation opening, relief groove,
Ensure the perpendicularity of valve element, can effectively suppress the fluctuation of gaseous-pressure inside fuel gas injection valve, realize the steady operation of air-flow,
Reliably working, realize high response speed；By the mixed admission mode of the axially main direct air inlet of air drain and circumferential tonifying Qi gas inlet hole,
Big flow is realized, effectively improves the supply efficiency of engine, while air-flow can be avoided to interfere, realizes the stabilization of gas circuit；It is logical
The multiple tracks zonary structure of valve element and valve base chamber is crossed, realizes the face sealing of fuel gas injection valve, high reliability.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the valve element composite unit structure schematic diagram of the present invention；
The gas circuit that Fig. 3 is the present invention 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 present invention is described in more detail：
With reference to Fig. 1-7, Fig. 1 is that the overall structure of interior guiding fuel gas injection valve of the bypass type of the present invention with floating valve seat 17 is shown
It is intended to, mainly by piezo actuator 3, master reset spring 14, auxiliary back-moving spring 9, valve element assembly 15, valve body 1 and floating valve seat
17 compositions.Piezo actuator 3 is fixed on valve body 1 by fixing bolt, is sequentially arranged from top to bottom below piezo actuator 3
There are valve element assembly 15, floating valve seat 17.
As shown in Fig. 2 the valve element assembly 15 of fuel gas injection valve is oriented in a kind of piezoelectric type of the bypass type with floating valve seat
Mainly it is made up of guide finger 18, armature 19, spring base 20, fastening bolt 27, pad 25, bottom plate 21 and valve element 22, armature 19 is logical
Cross fastening bolt 27 to link together with bottom plate 21, valve element 22, one layer of pad 25, spring are disposed between armature 19 and bottom plate 21
Seat 20 is arranged on the top of bottom plate 21, and its internal side surface is in contact with the side surface of armature 19, and the two of master reset spring 14
Respectively in the annular groove of dividing plate 13 and spring base 20, the center of dividing plate 13 is provided with the straight trough of certain depth at end, in guide finger 18
The heart is provided with pressure compensation opening 24, and a number of relief groove 26 is provided with bottom plate 21, avoids armature 19 from being made by axial force
Airline pressure is more easy to reach balance inside and outside at armature 19, improves the response speed of armature 19, and the top of guide finger 18 is disposed with auxiliary reset
Spring 9.Pressure compensation opening 24 at the center of guide finger 18 coordinates the relief groove 26 on bottom plate 21 to cause valve element assembly 15
Inner space connects with exterior space, and inside and outside gas circuit reaches balance, and the inside and outside combustion gas no pressure of valve element assembly 15 is poor, avoids certainly
It is made up of during in motion by extra axial force, valve element 22 valve element main body, fin 29 and seal band 23.Valve element assembly
15 integral arrangements are below piezo actuator 3.
Piezo actuator 3 is made up of piezo-electric crystal 2, control valve rod 4, fluid power amplifier, auxiliary back-moving spring, and wherein fluid power is put
Big device 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 amplifier
The top of dividing plate 13 being arranged on valve body, is covered with the fuel oil of certain pressure in sleeve 8, big piston 5, valve piston 10 and sleeve 8 it
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 fluid power of valve rod 4
The upper surface of big piston 5 in amplifier is in contact, and the large and small piston in fluid power amplifier has been arranged symmetrically four, living greatly
In the presence of filling in 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 makes it be brought into close contact with guide finger lower surface using valve piston support spring 11, and guide finger upper surface is disposed with auxiliary multiple
Position spring 9.
As shown in figure 3, first, combustion gas is vertically flowed into valve body 7 by air inlet 30, flowed into along air inlet 25 and be full of valve body
Inside 1.In the fuel gas injection valve course of work, when piezo-electric crystal 2 is not powered on, in master reset spring 14 and auxiliary back-moving spring 9
Under pretightning force effect, valve element assembly 15 maintains motionless, the seal band of the valve element 22 in valve element assembly 15 in initial position
23 lower surface and the upper surface of the outlet annulus 16 of valve seat 39 are brought into close contact, now outlet annulus 16 and the inner space of valve body 1
Not yet connect, the whole space inside valve body 1 of the combustion gas full of fuel gas injection valve.Piezo-electric crystal 2 be powered after, piezo-electric crystal 2 by
To current excitation so as to extending so that control valve rod 4 moves downward, and the big piston 5 on fluid power amplifier moves downward therewith, liquid
Fluid pressure rise in power amplifier middle sleeve 8, in the presence of fluid pressure, the valve piston on fluid power amplifier is transported upwards
Dynamic, guide finger is by after the upward active force of four valve pistons 10, and smoothly motion upwards, guide finger is as valve element assembly 15
A part, the overall motion upwards therewith of valve element assembly 15, motion separates band movable valve plug 22 with the surface of valve seat 39 upwards, until
The upper surface of spring base 20 is in contact with the lower surface of electromagnet 1, in whole motion process, the axial movement of armature 19 and circumference
Positioning realizes that now, gas circuit is opened, and gas valve is opened, and gas is fast by the cooperation between guide finger 18 and dividing plate 13 to control
Speed is flowed into by the axially mixed admission mode in main air drain 35 and circumferential tonifying Qi hole 33, by multiple tracks ring cavity 32, finally by gas outlet
34 vertical outflows；Piezo-electric crystal 2 powers off, and piezo-electric crystal 2 starts to shorten, in the presence of big piston support spring 6, big piston 5
Starting to move upwards, fluid pressure declines in the sleeve 8 in fluid power amplifier, in the presence of major-minor back-moving spring, guide finger
Start to move downward, valve piston 10, valve element assembly 15 are overall together to be moved downward therewith, until pressure is returned in fluid power amplifier
To original state, big valve piston returns to initial position, and now valve element assembly 15 is also corresponding returns to initial position, and gas circuit is closed
Close, gas valve is closed.
As shown in fig. 6, in order to prevent combustion gas reverse leakage, the reliability and security of fuel gas injection valve are improved, the present invention
Employ the structure of floating valve seat 17.Floating valve seat 17 can lock gas valve when gas valve external pressure height is with air pressure inside
Extremely, 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, valve seat are multiple
Position spring 43, O-ring seal 38, packing washer 36, deformable seal circle 41, elastic washer 42.Guide base 37 is with valve body 1
Integral structure, valve seat 39 are arranged on guide base 37.The inner ring of guide base 37 carries T-shaped structure, the T with the outer ring of valve seat 39
Shape structure is engaged.The both ends of valve seat back-moving spring 43 are separately fixed on valve seat 39 and valve element 15, and keep certain pretightning 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, install packing washer 36 in deformable seal circle 41 above outer additional, be fixed on by screw 40 on valve seat 39, packing washer
36 ensure uniform force, strengthen sealing.The material of deformable seal circle 41 uses deformable flexible plastic, ensures that it does not influence
The motion of valve seat 39.Second resealing is to have installed two layers of O-ring seal 38 additional in the T-shaped junction of valve seat 39 and guide base 37,
Further enhance sealing.T-shaped junction between valve seat 39 and guide base 37 has installed one layer of elastic washer 42 additional, reduces
Vibratory impulse power during contact, serves the effect of damping.Effectively increase the reliability of gas valve.
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 15 effect.Valve element 15 is acted on by back-moving spring elastic force.Air pressure is more than combustion gas below gas valve
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, under valve seat 39
Square contact area is 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 15 upward
Before motion, the external gas pressure F1, F2 overcome the initial tension of spring of back-moving spring 7, and valve seat 39 is upward together with valve element 15
Motion.Valve seat 39 is moved upwardly until that spring base 15 is in contact with dividing plate 13.Even if now piezo-electric crystal 2 is powered, valve element 15
It 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 15 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 15 moves downward in the presence of back-moving spring, and gas valve is closed.If now piezo-electric crystal 2 does not lead to
Electricity, valve seat 39 move back down to original position together with valve element 15 in the presence of back-moving spring is major-minor, and gas valve remains turned-off.Think
When opening gas valve, piezo-electric crystal 2 is powered, and valve element 15 moves upwards, and gas valve is normally-open.
From the above-mentioned course of work, outer guiding fuel gas injection valve of the bypass type of the present invention with floating valve seat uses band to float
The structure of valve seat 17, it effectively can prevent fuel gas injection valve from reverse leakage occur in the case of injection valve inner and outer air pressure exception
Situation and with damping function, ensure that fuel gas injection valve work reliability and safety；By by-pass structure and enter
The structure of gas port 25 realizes air inlet and water conservancy diversion process；The control of valve element 22 is realized by the control of actuator, the control of gas circuit, realized
Air injection function；Ensure the perpendicularity of valve element 22 by interior guide frame；By opening pressure compensation opening 24 simultaneously at the center of guide finger 18
A number of relief groove 26 is provided with bottom plate 21, avoids armature 19 from being made gas circuit inside and outside at armature 19 by axial force
Pressure is more easy to reach balance, improves the response speed of armature 19；The structure in multiple circumferential tonifying Qi holes 33, valve are driven on the rib of valve element 22
The lower surface of core 22 and the upper surface of valve seat 39 are provided with multiple tracks ring cavity 32, increase valid circulation area, reduce valve element 22 and valve seat 39
Quality, improve reliability；The diversion angle of cone 28 of certain angle is set at the circumferential tonifying Qi hole 33 of valve element 22, reduces flow losses,
Increase discharge coefficient；The present invention uses the axially mixed admission mode of main 35 direct air inlet of air drain and the circumferential air inlet of tonifying Qi hole 33,
Increase charge flow rate coefficient, realize big flow, be effectively improved the supply efficiency of fuel gas injection valve, while air-flow can be avoided
Interference, realizes balancing, stably for gas circuit；Multiple-sealed annulus 23 and the structure of outlet annulus 16 are used between valve element 22 and valve seat 39,
The face sealing of fuel gas injection valve, voltage stabilizing balance are realized, and wider annulus area can reduce impact, improve reliability.
Technical scheme：Fuel gas injection valve is oriented in a kind of piezoelectric type of the bypass type with floating valve seat, it is main
It is made up of piezo actuator, master reset spring, auxiliary back-moving spring, valve element assembly, valve body and floating valve seat.Piezo actuator by
Piezo-electric crystal, control valve rod, fluid power amplifier, auxiliary back-moving spring composition, wherein fluid power amplifier are supported by big piston, big piston
Spring, valve piston, valve piston support spring and sleeve composition, fluid power amplifier are arranged in above the dividing plate on valve body, in sleeve
It is covered with the fuel oil of certain pressure, the mating surface between big piston, valve piston and sleeve is equipped with sealing ring 7；Below piezo-electric crystal
Control valve rod is disposed with, controls the lower surface of valve rod to be in contact with the big piston upper surface in fluid power amplifier, fluid power amplifier
In large and small piston be arranged symmetrically four, it is piezo-electric crystal, control valve rod, big living in the presence of big piston support spring
Stopper it is closely connected be combined, the valve piston in fluid power amplifier makes it close with guide finger lower surface using valve piston support spring
Fitting, guide finger upper surface is disposed with auxiliary back-moving spring.Piezo actuator is fixed on valve body by fixing bolt, is held in piezoelectricity
Valve element assembly, floating valve seat have been sequentially arranged from top to bottom below row device；Valve element assembly by guide finger, armature, spring base,
Pad, bottom plate, fastening bolt and valve element composition, armature are linked together by fastening bolt and bottom plate, valve element, armature and bottom plate
Between be disposed with one layer of pad, spring base is arranged on the top of bottom plate, and its internal side surface is in contact with the side surface of armature,
Respectively in the annular groove of dividing plate and spring base, guide pin centre is provided with pressure compensation opening, bottom plate at the both ends of master reset spring
On be provided with a number of relief groove, the guide finger center for being threadedly secured in armature, valve element is by valve element main body, rib
Piece, seal band composition, valve element assembly integral arrangement below electromagnet, opened on the fin of valve element circumferential tonifying Qi hole and
Diversion angle of cone is set at tonifying Qi hole, seal band and outlet annulus, face sealing are used between valve element and floating valve seat, voltage stabilizing is put down
Weighing apparatus, and there is wider annulus area.Floating valve seat is by guide base, valve seat and valve seat back-moving spring, O-ring seal, pressure
Tight packing ring, deformable seal circle, elastic washer composition.Guide base is integral with valve body, and valve seat is arranged 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 at
On valve seat and valve element, and keep certain pretightning force.Install double anti-gas-leak structure additional between valve seat and guide base, first
Weight anti-gas-leak structure is that deformable seal circle is installed above valve seat and guide base junction, in deformable seal circle on outer
Side installs packing washer additional, is screwed on valve seat.The material of deformable seal circle uses deformable flexible plastic, ensures
It does not influence the motion of valve seat.Second resealing is to have installed two layers of O-ring seal additional in the T-shaped junction of valve seat and guide base.
Claims (3)
1. fuel gas injection valve is oriented in a kind of piezoelectric type of the bypass 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, are hatch frame above valve body, on hatch frame
Fixed block is fixed with, straight trough is provided with the middle part of fixed block, piezo-electric crystal is arranged in straight trough, setting dividing plate in the middle part of valve body, on dividing plate
Side sets fluid power amplifier, and valve element assembly is set below dividing plate, sets through hole respectively on dividing plate, the fluid power amplifier includes
Big piston, valve piston, sleeve, sleeve are arranged on dividing plate, and the end set of sleeve upper end slightly exports, sleeve upper end tip inside
Thin outlet is set, and big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, is set between the flange and sleeve of big piston
Big piston support spring is put, valve piston support spring is set between the flange and sleeve of valve piston, below big piston, valve piston
Filled with hydraulic oil in sleeve, 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
Auxiliary back-moving spring is set between bar, the upper surface and piezo-electric crystal for controlling valve rod fit together, control the lower surface of valve rod with
Big piston upper surface fits together, and valve piston upper surface fits together with guide finger, and described valve element assembly includes rank
Iron, spring base, bottom plate, valve element, armature, bottom plate, valve element arrange while linked together by fastening bolt from top to bottom, spring
Seat forms annular groove outside armature and between armature, and dividing plate lower surface sets annular groove, the both ends point of master reset spring
It is not arranged in the annular groove of dividing plate and the annular groove of spring base, guide finger is mutually fixed with armature, sets pressure to put down in guide finger
Weigh hole, relief groove is set on bottom plate, valve element is hollow structure, pressure compensation opening, relief groove, the hollow space of valve element
Communicate, seal band is set on valve element, seal band forms ring cavity；The floating valve seat includes guide base, valve seat, is oriented to base
Seat is fixed in valve body, and valve seat be located at below valve element, and guide base inner ring is provided with T-shaped structure, valve seat outer ring by setting and
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 bypass 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 bypass type with floating valve seat according to claim 1 or 2, it is special
Sign is：Air inlet is set on valve body, and air inlet is located at the outwardly directed part of valve body, air inlet diversion cavity formed below, air inlet
Mouth, diversion cavity communicate；
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, by
Current excitation is so as to extending so that control valve rod moves downward, and big piston moves downward therewith, hydraulic fluid pressure rise, small work
Motion, guide finger are moved plug upwards by after the upward active force of valve piston upwards, the overall motion upwards therewith of valve element assembly,
Motion is separated band movable valve plug with valve base surface upwards, and until the upper surface of spring base is in contact with the lower surface of dividing plate, gas circuit is opened
Open, gas valve is opened, and gas is flowed into by the axially mixed admission mode in main air drain and circumferential tonifying Qi hole, by ring cavity, by outlet
The vertical outflow of mouth；Shorten after piezo-electric crystal power-off, in the presence of big piston support spring, big piston upwards, hydraulic oil
Pressure declines, and in the presence of major-minor back-moving spring, guide finger moves downward, and valve piston, valve element assembly are overall therewith together
Move downward, until hydraulic fluid pressure returns to original state, big piston, valve piston return to initial position, and valve element assembly returns to
Initial position, gas circuit are closed, and gas valve is closed.
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| CN107420226B (en) | 2023-05-30 |
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