CN107061055B - Combined double-piezoelectric fuel gas injection valve - Google Patents
Combined double-piezoelectric fuel gas injection valve Download PDFInfo
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- CN107061055B CN107061055B CN201710504566.1A CN201710504566A CN107061055B CN 107061055 B CN107061055 B CN 107061055B CN 201710504566 A CN201710504566 A CN 201710504566A CN 107061055 B CN107061055 B CN 107061055B
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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
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
- F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02D19/0686—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
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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
- F02M21/0269—Outwardly opening valves, e.g. poppet 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)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention aims to provide a combined double-piezoelectric fuel gas injection valve, which can quickly realize the switching of fuel gas injection when a single valve core or a double valve core is lifted by independently controlling the movement of respective valve core assemblies through two piezoelectric crystals, has high fuel gas injection flexibility, ensures the control precision of the fuel gas injection valve on fuel gas injection, meets different requirements on fuel gas injection quantity when the internal combustion engine has different powers, can realize low-power output when the single piezoelectric crystal is electrified, and can realize high-power output when the double piezoelectric crystals are electrified simultaneously; the piezoelectric crystal is used as a driving element, so that the response speed of the gas injection valve is effectively improved, and the lift of the gas injection valve is variable through different current driving modes of the piezoelectric crystal; the valve seat structure with the pressure stabilizing cavity is adopted, so that fluctuation of the gas pressure inside the gas injection valve can be effectively restrained, and stability of the gas injection pressure of the gas injection valve is guaranteed.
Description
Technical Field
The invention relates to a gas injection valve, in particular to a gas injection valve on a gas engine and a dual-fuel internal combustion engine.
Background
Along with the increasing consumption of fossil energy and the increasing strictness of emission regulations, energy conservation and emission reduction become the necessary trend of the development of the internal combustion engine industry, the search of an available alternative energy is an effective way for promoting energy conservation and emission reduction, and natural gas becomes the energy with the most development prospect due to the advantages of abundant storage, low price, clean combustion and the like of natural gas, and the development of the internal combustion engine taking gas fuel such as natural gas as main fuel becomes a research hotspot in the internal combustion engine industry. The fuel gas injection valve is used as an important executive component in the air supply system of the internal combustion engine, and the performance of the fuel gas injection valve has a remarkable influence on the working characteristics of the internal combustion engine. At present, in the whole working condition working process of the internal combustion engine, the single-cylinder power range is wide, the control precision of the high-flow gas injection valve for small-flow gas injection is low, the control precision requirement of the internal combustion engine for gas injection during partial load is not met, the low-flow gas injection valve is not met, the requirement of the internal combustion engine for large-flow gas injection under the high-power working condition is not met, and the power requirement of the internal combustion engine under different working conditions cannot be met by matching the internal combustion engine with only a single gas injection valve. Meanwhile, the gas injection valve needs to have high enough response speed to meet the requirement of rapid switching, and also needs to have the largest possible outlet cross-sectional area to ensure that the internal combustion engine obtains sufficient gas supply. In addition, the characteristics of the fuel gas injection valve, such as the supply of the fuel gas during operation, the stability of the fuel gas injection pressure, and the control accuracy, affect the operating characteristics of the internal combustion engine.
Disclosure of Invention
The invention aims to provide a combined double-piezoelectric fuel gas injection valve which is matched with the power range of the whole working condition of an internal combustion engine, has high response speed and stable fuel gas injection pressure.
The purpose of the invention is realized in the following way:
the invention relates to a combined double-piezoelectric fuel gas injection valve, which is characterized in that: the valve seat is fixed below the valve body and forms a valve space with the valve body, the fixed block is fixed above the inside of the valve body, a first straight groove and a second straight groove are formed in the middle of the fixed block, the first piezoelectric crystal is installed in the first straight groove, the second piezoelectric crystal is installed in the second straight groove, a partition plate is arranged in the middle of the valve body, the first hydraulic amplifier and the second hydraulic amplifier are arranged above the partition plate, the first valve core assembly and the second valve core assembly are arranged below the partition plate, and a first through hole, a second through hole and a vent hole are respectively formed in the partition plate;
the first hydraulic amplifier comprises a first large piston, a first small piston and a first sleeve, wherein the first sleeve is arranged on a partition plate, a first thick outlet is formed in the end part of the upper end of the first sleeve, a first thin outlet is formed in the inner side of the end part of the upper end of the first sleeve, the first large piston is arranged in the first thick outlet, the first small piston is arranged in the first thin outlet, a first large piston supporting spring is arranged between the flange of the first large piston and the first sleeve, a first small piston supporting spring is arranged between the flange of the first small piston and the first sleeve, hydraulic oil is filled in the first sleeve below the first large piston and the first small piston, a first guide pin penetrates through a first through hole of the partition plate, a first control valve rod is arranged above the first guide pin, a first guide pin reset spring is arranged between the first guide pin and the first control valve rod, the upper surface of the first control valve rod is attached to the first piezoelectric crystal, the lower surface of the first control valve rod is attached to the upper surface of the first large piston, and the upper surface of the first small piston is attached to the first guide pin; the first valve core assembly comprises a first armature, a first spring seat, a first bottom plate and a first valve core, wherein the first armature, the first bottom plate and the first valve core are arranged from top to bottom and are simultaneously connected together through a fastening bolt, the first spring seat is positioned outside the first armature and forms an annular groove with the first armature, the lower surface of a partition plate is provided with the first annular groove and a second annular groove, two ends of a first armature return spring are respectively arranged in the first annular groove of the partition plate and the annular groove of the first spring seat, a first guide pin is fixed with the first armature, a first pressure balance hole is arranged in the first guide pin, a first pressure balance groove is arranged on the first bottom plate, the first valve core is of a hollow structure, a first central pressure stabilizing cavity is arranged on a valve seat below the first valve core, the first pressure balance hole, the first pressure balance groove, a hollow part of the first valve core and the first central pressure stabilizing cavity are communicated to form a first inner space, a first sealing ring belt is arranged on the first valve core, and a first gas ring belt forms a first gas inlet cavity;
the second hydraulic amplifier comprises a second large piston, a second small piston and a second sleeve, wherein the second sleeve is arranged on a partition plate, a second thick outlet is arranged at the end part of the upper end of the second sleeve, a second thin outlet is arranged at the inner side of the end part of the upper end of the second sleeve, the second large piston is arranged in the second thick outlet, the second small piston is arranged in the second thin outlet, a second large piston supporting spring is arranged between the flange of the second large piston and the second sleeve, a second small piston supporting spring is arranged between the flange of the second small piston and the second sleeve, hydraulic oil is filled in the second sleeve below the second large piston and the second small piston, a second guide pin penetrates through a second through hole of the partition plate, a second control valve rod is arranged above the second guide pin, a second guide pin reset spring is arranged between the second guide pin and the second control valve rod, the upper surface of the second control valve rod is attached to the second piezoelectric crystal, the lower surface of the second control valve rod is attached to the upper surface of the second large piston, and the upper surface of the second small piston is attached to the second guide pin; the second valve core assembly comprises a second armature, a second spring seat, a second bottom plate and a second valve core, wherein the second armature, the second bottom plate and the second valve core are arranged from top to bottom and are connected together through fastening bolts, the second spring seat is positioned outside the second armature and forms an annular groove with the second armature, two ends of a second armature return spring are respectively arranged in the second annular groove of the baffle plate and the annular groove of the second spring seat, a second guide pin is fixed with the second armature, a second pressure balance hole is arranged in the second guide pin, a second pressure balance groove is arranged on the second bottom plate, the second valve core is of a hollow structure, a second central pressure stabilizing cavity is arranged on the valve seat below the second valve core, the second pressure balance hole, the second pressure balance groove, the hollow part of the second valve core and the second central pressure stabilizing cavity are communicated and form a second inner space, a second sealing ring belt is arranged on the second valve core, and a second ring belt forms a second ring cavity;
the first hydraulic amplifier and the second hydraulic amplifier are arranged side by side, and the first valve core assembly and the second valve core assembly are arranged side by side; the valve seat is provided with an air outlet ring belt, the air outlet ring belt is positioned below the first annular cavity and the second annular cavity, and an air outlet is arranged below the air outlet ring belt.
The invention may further include:
1. the outer end of the valve seat is provided with an end pressure stabilizing cavity.
2. An air inlet is formed between the upper part of the fixed block and the valve body, an air inlet cavity is formed between the middle lower part of the fixed block, the first hydraulic amplifier, the second hydraulic amplifier and the valve body, a diversion cavity is formed between the first valve core assembly and the second valve core assembly and between the first valve core assembly and the valve body, the air inlet cavity, the vent holes and the diversion cavity are communicated and form an external space, the external space is communicated with the first internal space and the second internal space, a first axial air inlet hole is formed in the first valve core, and a second axial air inlet hole is formed in the second valve core;
the fuel gas vertically flows into the valve body through the air inlet and vertically flows along the air inlet cavity until flowing through the vent holes, a part of the fuel gas flows into the inner space of the first valve core assembly and the second valve core assembly, the first central pressure stabilizing cavity and the second central pressure stabilizing cavity, and the rest of the fuel gas continuously flows along the flow guiding cavity to fill the end pressure stabilizing cavity at the outer end of the valve seat and the surrounding space of the first valve core and the second valve core;
when the first piezoelectric crystal works independently and is not electrified, a first sealing ring belt on the first valve core is tightly matched with the upper surface of the valve seat, and gas fills the inner space of the valve body of the gas injection valve; after the first piezoelectric crystal is electrified, the first piezoelectric crystal is excited by current to extend so as to push the first large piston to move downwards, hydraulic oil in the first sleeve is compressed, the first small piston moves upwards under the action of hydraulic oil pressure, the first guide pin also moves upwards to drive the first valve core assembly to move upwards, the gas injection valve is opened, the gas circuit is opened until the hydraulic oil pressure in the first sleeve returns to an initial state, the first large piston and the first small piston do not move any more, the first valve core assembly is stopped, gas flows in from a first axial air inlet hole on the first valve core, and flows out vertically after being guided through a gas outlet through a gap between the first valve core and a valve seat through a first gas inlet ring cavity; after the piezoelectric crystal is powered off, the piezoelectric crystal is shortened, the first large piston returns to the initial position under the action of the first large piston supporting spring, the pressure of hydraulic oil in the first sleeve is reduced, the first guide pin moves downwards under the action of the first guide pin resetting spring, the first small piston and the first valve core assembly move downwards along with the first large piston and the first small piston until the pressure of the hydraulic oil in the first sleeve returns to the initial state, the first large piston and the first small piston return to the initial position, the first valve core assembly returns to the initial position, the surface of the first valve core is attached to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed;
when the second piezoelectric crystal works independently and is not electrified, a second sealing ring belt on the second valve core is tightly matched with the upper surface of the valve seat, and the gas fills the inner space of the valve body of the gas injection valve; after the second piezoelectric crystal is electrified, the second piezoelectric crystal is excited by current to extend so as to push the second large piston to move downwards, hydraulic oil in the second sleeve is compressed, the second small piston moves upwards under the action of hydraulic oil pressure, the second guide pin also moves upwards to drive the second valve core assembly to move upwards, the gas injection valve is opened, the gas circuit is opened until the hydraulic oil pressure in the second sleeve returns to an initial state, the second large piston and the second small piston do not move any more, the second valve core assembly is stopped, gas flows in through a second axial air inlet hole on the second valve core, and flows out vertically after being guided through a gas outlet through a gap between the second valve core and a valve seat through a second air inlet ring cavity; after the piezoelectric crystal is powered off, the piezoelectric crystal is shortened, the second large piston returns to the initial position under the action of the second large piston supporting spring, the pressure of hydraulic oil in the second sleeve is reduced, the second guide pin moves downwards under the action of the second guide pin resetting spring, the second small piston and the second valve core assembly move downwards along with the second guide pin until the pressure of the hydraulic oil in the second sleeve returns to the initial state, the second large piston and the second small piston return to the initial position, the second valve core assembly returns to the initial position, the surface of the second valve core is attached to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed;
when the first piezoelectric crystal and the second piezoelectric crystal are operated in combination, the operation is the same as that when they are operated alone.
The invention has the advantages that: according to the invention, the movement of the valve core assembly is independently controlled by the two piezoelectric crystals, so that the switching of gas injection when the single valve core or the double valve cores are lifted can be quickly realized, the flexibility of gas injection is high, the control precision of the gas injection valve on the gas injection is ensured, the different requirements on the gas injection quantity when the internal combustion engine is at different powers are met, the single piezoelectric crystal is electrified to realize low-power output, and the double piezoelectric crystals are electrified simultaneously to realize high-power output; according to the invention, the piezoelectric crystal is used as a driving element, so that the response speed of the gas injection valve is effectively improved, and the lift of the gas injection valve is variable through different current driving modes of the piezoelectric crystal; the invention adopts the valve seat structure with the pressure stabilizing cavity, which can effectively inhibit the fluctuation of the gas pressure in the gas injection valve and ensure the stability of the gas injection pressure of the gas injection valve.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged view of the structure of the first valve element assembly of the present invention;
FIG. 3 is an enlarged view of the structure of the second valve core assembly of the present invention;
FIG. 4 is a gas path trend diagram;
FIG. 5 is an enlarged view of the three-dimensional structure of the first and second spools;
fig. 6 is an enlarged view of a three-dimensional structure of the valve seat.
Detailed Description
The invention is described in more detail below, by way of example, with reference to the accompanying drawings:
referring to fig. 1-6, fig. 1 is a schematic diagram of an overall structure of a combined dual-piezoelectric fuel injection valve according to the present invention, including a valve body 1, a fixed block 2, a first piezoelectric crystal 3, a first control valve stem 4, a first guide pin return spring 5, a first valve element assembly 6, a first large piston 7, a first large piston support spring 8, a first small piston support spring 9, a first small piston 10, a first seal ring 11, a first sleeve 12, a seal ring 16, a valve seat 17, a second piezoelectric crystal 18, a second valve element assembly 19, a second control valve stem 20, a second guide pin return spring 21, a second large piston 22, a second large piston support spring 23, a second small piston support spring 24, a second small piston 25, a second seal ring 26, and a second sleeve 27. The first large piston 7, the first small piston 10, the first large piston supporting spring 8, the first small piston supporting spring 9 and the first sealing ring 11 which are arranged below the first control valve rod 4 and the first sleeve 12 together form a hydraulic amplifier I of the first piezoelectric crystal 3, the second large piston 22, the second large piston supporting spring 23, the second small piston 25, the second small piston supporting spring 24, the second sealing ring 26 and the second sleeve 27 which are arranged below the second control valve rod 20 together form a hydraulic amplifier II of the second piezoelectric crystal 18, all components of the hydraulic amplifier II and the hydraulic amplifier I have the same structure and the same arrangement mode, share one valve body 1 and are symmetrically distributed in the valve body 1, the hydraulic amplifier I and the hydraulic amplifier II are integrally arranged above a partition 14 in the valve body 1, a first valve core assembly 6 and a second valve core assembly 19 are respectively arranged below the corresponding positions of the hydraulic amplifier I and the amplifier II, all components of the second valve core assembly 19 and the first valve core assembly 6 have the same structure and the same arrangement mode, and the hydraulic amplifier I, the first valve core assembly 6 and the hydraulic amplifier I and the second valve core assembly 17 are symmetrically distributed in the valve body 1 and the valve body 17 are fixedly distributed in the valve body 1. The fixed block 2 is connected with the valve body 1 through threads, so that the fixed block 2 is fixed at the central position of the valve body 1, two straight grooves with a certain depth are symmetrically formed in the fixed block 2, the first piezoelectric crystal 3 and the second piezoelectric crystal 18 are respectively arranged in the two straight grooves, through holes with smaller diameters are formed above the two straight grooves and are used for arranging the piezoelectric crystal and a connecting wire of a control unit outside the valve body 1, a first control valve rod 4 is arranged below the first piezoelectric crystal 3, the lower surface of the first control valve rod 4 is contacted with the upper surface of a first large piston 7, under the action of the pretightening force of a first guide pin reset spring 5 and a first large piston support spring 8, the lower surface of the first piezoelectric crystal 3 is tightly adhered to the upper surface of the first control valve rod 4, the lower surface of the first control valve rod 4 is tightly adhered to the upper surface of the first large piston 7, the upper end of the first sleeve 12 is provided with two outlets, a thick outlet and a thin outlet are respectively arranged, the lower end of the first large piston 7 is a communicated closed cavity, the lower end of the first large piston 7 is arranged in the thick outlet of the first sleeve 12, the first large piston supporting spring 8 is positioned between the flange of the first large piston 7 and the first sleeve 12, the first large piston 7 is ensured not to integrally enter the sleeve, the first sleeve 12 is filled with first hydraulic oil 13 with certain pressure, a first small piston 10 is arranged above the thin outlet of the first sleeve 12, the lower end of the first small piston 10 is arranged in the first small piston 10, a first small piston supporting spring 9 is arranged between the flange of the first small piston 10 and the first sleeve 12 so as to ensure that the first small piston 10 cannot integrally enter the first sleeve 12, a first sealing ring 11 is arranged between the side surfaces of the first large piston 7 and the first small piston 10 and the inner wall of the first sleeve 12 so as to prevent leakage of the first hydraulic oil 13 in the first sleeve 12, the first valve core assembly 6 and the valve seat 17 are sequentially arranged below the center position of the first control valve rod 4 from top to bottom, under the action of the pretightening force of the first small piston supporting spring 9, the upper surface of the first small piston 10 is tightly attached to the upper end of the first valve core assembly 6, the second control valve rod 20 is tightly arranged below the second piezoelectric crystal 18, under the action of the pretightening force of the second small piston supporting spring 24, the upper surface of the second small piston 25 is tightly attached to the upper end of the second valve core assembly 19, the valve seat 17 is provided with a bolt hole 62, the valve seat 17 and the valve body 1 are fixedly connected together through bolts, the matching surfaces between the two are sealed through the sealing rubber rings 16, the valve seat 17 is provided with a pressure stabilizing cavity 15 at the center position lower ends of the first valve core 33 and the second valve core 44 and the two ends of the sealing annular belt 34 and the second sealing annular belt 45, the pressure stabilizing cavity 15 at the center position lower ends of the first valve core 33 and the second valve core 44 are tightly attached to the upper end of the first valve core assembly 6 and the second valve core assembly 19, the valve seat 17 is provided with a bolt hole 62, the valve seat 17 is fixedly connected with the gas cavity 17 through bolts, the pressure stabilizing cavity 15 can be restrained from fluctuation in the valve seat 1, and the pressure stabilizing cavity is effectively ensured, and the pressure of the gas valve seat 17 is stable in the jet valve is guaranteed, and the jet valve is stable in the process.
As shown in fig. 2, a first valve core assembly 6 of the combined double-piezoelectric fuel gas injection valve is composed of a first guide pin 29, a first armature 30, a first spring seat 31, a first bottom plate 32, a first valve core 33, a first armature return spring 36, a first gasket 37 and a first fastening bolt 39, in order to ensure that the first guide pin 29 moves stably, a plurality of first small pistons 10 are symmetrically arranged below the first guide pin 29, a corresponding plurality of hydraulic amplifiers i are arranged below the first guide pin 29, the number of symmetry is even, under the action of a first small piston support spring 9, the upper surface of the first small pistons 10 is tightly attached to the lower surface of the first guide pin 29 in the first valve core assembly 6, a first pressure balance hole 35 is formed in the center of the first guide pin 29 and is arranged in a through hole in the center of a partition 14, the lower end of the first guide pin 29 is fixed with the first armature 30 through threaded connection, the first armature 30 is connected with the first bottom plate 32 and the first valve core 33 through a first fastening bolt 39, a layer of first gasket 37 is arranged between the first armature 30 and the first bottom plate 32, four first pressure balance grooves 38 are formed above the first bottom plate 32, a first spring seat 31 is arranged above the first bottom plate 32, the inner side surface of the first spring seat 31 is contacted with the side surface of the first armature 30, two ends of a first armature return spring 36 are respectively positioned in annular grooves of the partition plate 14 and the first spring seat 31, a first valve core 33 below the first bottom plate 32 consists of a valve core main body and a first sealing ring belt 34, and a first valve core assembly 6 is integrally arranged below the first control valve rod 4; the second spool assembly 19 is composed of a second guide pin 40, a second armature 41, a second spring seat 42, a second bottom plate 43, a second spool 44, a second armature return spring 47, a second spacer 48, and a second fastening bolt 50, the respective components of the second spool assembly 19 are arranged identically to the first spool assembly 6, and the second spool assembly 19 is integrally arranged below the second control valve stem 20.
As shown in fig. 3, in a combined double-pressure fuel gas injection valve, first, fuel gas flows vertically into a valve body 1 through an air inlet 51, flows vertically along an air inlet chamber 52 until flowing through holes at both ends of a partition plate 14 on the valve body 1, and due to the presence of a first pressure balance groove 38 on a first bottom plate 32 and a first pressure balance hole 35 on a first guide pin 29 in a first valve core assembly 6, an inner space of the first valve core assembly 6 communicates with an outer space, and a part of fuel gas flows into the inner space of the first valve core assembly 6 and a space above the first valve core assembly 6, and then fills a pressure stabilizing chamber 15 at the central lower ends of the first valve core 33 and the second valve core 44; the rest of the fuel gas flows into the full valve body 1 along the flow guide cavity 54, part of the fuel gas flows into the full valve body 1 through the first axial air inlet hole 55 and the second axial air inlet hole 58, the first air inlet ring cavity 56 and the second air inlet ring cavity 59 with certain depths are filled around the plurality of first sealing ring belts 34 and the second sealing ring belts 45, and the other part of the fuel gas fills the pressure stabilizing cavity 15 at the center and two ends of the valve seat 17 and the surrounding space of the first valve core 33 and the second valve core 44. When the first piezoelectric crystal 3 is not electrified, the surface of the first valve core 33 is attached to the surface of the valve seat 17, and the first air inlet ring cavity 56 on the first valve core 33 is not communicated with the ring cavity near the air outlet ring belt 61 on the valve seat 17; after the first piezoelectric crystal 3 is electrified, the first piezoelectric crystal 3 stretches, the first valve core assembly 6 is driven to move upwards after being amplified by the hydraulic amplifier I, the surface of the first valve core 33 is separated from the surface of the valve seat 17, at the moment, the first air inlet ring cavity 56 is communicated with the ring cavity near the air outlet ring belt 61, lifting and seating of the first valve core 33 control on-off between the first air inlet ring cavity 56 and the ring cavity near the air outlet ring belt 61, the control mode of the second piezoelectric crystal 18 is the same as that of the first piezoelectric crystal 3, and lifting and seating of the second valve core 44 control on-off between the second air inlet ring cavity 59 and the ring cavity near the air outlet ring belt 61.
In the working process of the gas injection valve, the first piezoelectric crystal 3 and the second piezoelectric crystal 18 respectively control the gas injection process, taking the simultaneous working of the first piezoelectric crystal 3 and the second piezoelectric crystal 18 as an example, when the first piezoelectric crystal 3 and the second piezoelectric crystal 18 are not electrified, under the pretightening force of the first guide pin reset spring 5, the first armature reset spring 36, the second guide pin reset spring 21 and the second armature reset spring 47, the first valve core assembly 6 and the second valve core assembly 19 maintain motionless at the initial positions, the sealing ring belt 34 on the first valve core 33 in the first valve core assembly 6 and the second valve core 44 in the second valve core assembly 19 are tightly matched with the upper surface of the valve seat 17, the first air inlet ring cavity 56 on the first valve core 33 and the first air inlet ring cavity 59 on the second valve core 44 are not communicated with the annular cavity near the air outlet ring 61 on the valve seat 17, and the gas fills the whole space inside the valve body 1 of the gas injection valve. After the first piezoelectric crystal 3 is electrified, the first piezoelectric crystal 3 is excited by current so as to extend, so that the first control valve rod 4 moves downwards, the first large piston 7 moves downwards along with the first control valve rod, the first hydraulic oil 13 in the first sleeve 12 rises in pressure, the first small piston 10 moves upwards under the action of the pressure of the first hydraulic oil 13, the first guide pin 29 steadily moves upwards after receiving the upward acting force of the four first small pistons 10, the first guide pin 29 serves as a part of the first valve core assembly 6, the first valve core assembly 6 moves upwards as a whole, at the moment, the gas injection valve is opened, the gas channel is opened, until the pressure of the first hydraulic oil 13 in the first sleeve 12 returns to an initial state, the first large piston 7 and the first small piston 10 stop moving along with the first valve core assembly 6, the first valve core assembly 6 is maintained at the position for a period of time, in the process, the gas flows in from the first axial direction 55 on the first valve core 33, a first air inlet cavity 56 with a certain depth around the first sealing ring 34 is vertically arranged, the gas channel flows out of the first valve core assembly 17 through a first air inlet ring cavity 56, and a valve seat 17 vertically, the gas channel is arranged at the position close to the first valve seat 17, the pressure balancing cavity is evenly arranged at the position of the valve seat 17, the pressure balancing cavity is reduced, the pressure balancing cavity is formed between the valve seat and the valve seat 17, and the pressure balancing cavity is evenly is reduced, and the pressure cavity is arranged at the pressure balancing cavity is close to the pressure balancing position of the valve seat 17; after the first piezoelectric crystal 3 is powered off, the first piezoelectric crystal 3 shortens, the first large piston 7 starts to move upwards under the action of the first large piston supporting spring 8, the pressure of the first hydraulic oil 13 in the first sleeve 12 decreases, the first guide pin 29 starts to move downwards under the action of the first guide pin restoring spring 5, the first small piston 10 and the first valve core assembly 6 integrally move downwards together until the pressure of the first hydraulic oil 13 in the first sleeve 12 returns to an initial state, the first large piston 7 and the first small piston 10 return to an initial position, the first valve core assembly 6 correspondingly returns to the initial position at the moment, the surface of the first valve core 33 is attached to the surface of the valve seat 17, the initial position returns again, the gas injection valve is closed, and a gas path is closed. The driving mode of the second piezoelectric crystal 18 in the gas injection valve is the same as that of the first piezoelectric crystal 3, the second small piston 25, the second small piston supporting spring 24, the second sealing ring 26 and the second sleeve 27 in the hydraulic amplifier II below the second piezoelectric crystal are corresponding to the hydraulic amplifier I and the first piezoelectric crystal 3, the second valve core 44 surface is separated from the valve seat 17 surface, the second air inlet ring cavity 59 is communicated with the annular cavity near the air outlet ring cavity 61, the air channel is opened, the second piezoelectric crystal 18 is powered off, the second valve core assembly 19 returns to the initial position again, the second valve core 44 surface is attached to the valve seat 17 surface, and the air channel is closed after the second piezoelectric crystal 18 is powered off, and the second valve core assembly 19 is attached to the valve seat 17 surface. When the fuel gas injection valve works, according to indexes such as power, fuel gas quantity and the like required by the working condition of the internal combustion engine, the first piezoelectric crystal 3 and the second piezoelectric crystal 18 are powered on simultaneously or one of them is powered on, so that the requirement of normal working of the internal combustion engine is met.
The working process can be known as follows: according to the combined double-piezoelectric fuel gas injection valve, the hydraulic amplifier I, the first valve core assembly 6, the hydraulic amplifier II and the second valve core assembly 19 share the valve body 1, the fixed block 2 and the valve seat 17, the movement of the first valve core assembly 6 and the second valve core assembly 19 can be independently controlled through the first piezoelectric crystal 3 and the second piezoelectric crystal 18, the fuel gas injection can be rapidly switched when a single valve core or a double valve core is lifted, the fuel gas injection flexibility is high, the control precision of the fuel gas injection valve on the fuel gas injection is ensured, meanwhile, the different requirements on the fuel gas injection quantity when the internal combustion engine is at different powers are met, the low-power output can be realized by electrifying the single piezoelectric crystal, and the high-power output can be realized by electrifying the first piezoelectric crystal 3 and the second piezoelectric crystal 18 at the same time; according to the invention, the piezoelectric crystal is used as a driving element, so that the response speed of the gas injection valve is effectively improved, and the lift of the gas injection valve is variable through different current driving modes of the piezoelectric crystal; the invention adopts the valve seat 17 structure with the pressure stabilizing cavity, which can effectively inhibit the fluctuation of the gas pressure in the gas injection valve and ensure the stability of the gas injection pressure of the gas injection valve.
The number of the piezoelectric crystal, the corresponding hydraulic amplifier and the valve core assembly can be 2, 3, 4 and the like, the valve body structure can be a straight-through, bypass or straight-through bypass mixed structure, the valve core can be in an axial air inlet and axial and circumferential mixed air inlet mode, and the valve core assembly guide structure can be in a double inner guide, double outer guide or inner guide outer guide mixed mode and the like.
The invention relates to a combined double-piezoelectric fuel gas injection valve, which comprises a valve body, a fixed block, a first piezoelectric crystal, a first control valve rod, a first guide pin reset spring, a first valve core assembly, a first large piston support spring, a first small piston, a first sealing ring, a first sleeve, a sealing rubber ring, a valve seat, a second valve core assembly, a second control valve rod, a second guide pin reset spring, a second large piston support spring, a second small piston, a second sealing ring and a second sleeve, wherein the first large piston, the first small piston, the first large piston support spring, the first small piston support spring, the first sealing ring and the first sleeve together form a first piezoelectric crystal amplifier I, the second large piston support spring, the second small piston support spring, the second sealing ring and the second sleeve together form a second hydraulic crystal amplifier II, the hydraulic components of the second hydraulic crystal I and the second hydraulic amplifier II are symmetrically arranged in the same with the valve core assembly and the same as the hydraulic amplifier II, the hydraulic amplifier I and the hydraulic amplifier II are symmetrically arranged in the valve core assembly in the same direction as the valve body, the valve core assembly is symmetrically arranged in the valve body, the same with the valve core assembly, the hydraulic amplifier I is symmetrically arranged in the same with the valve body, the valve core assembly, and the hydraulic amplifier is respectively, A fixed block and a valve seat. The fixed block is connected with the valve body through threads to enable the fixed block to be fixed at the central position of the valve body, two straight grooves with a certain depth are symmetrically formed in the fixed block, the first piezoelectric crystal and the second piezoelectric crystal are respectively arranged in the two straight grooves, through holes with smaller diameters are formed above the two straight grooves and are used for arranging the piezoelectric crystal and a connecting wire of a control unit outside the valve body, a first control valve rod is arranged below the first piezoelectric crystal, the lower surface of the first control valve rod is contacted with the upper surface of the first large piston, under the action of the pretightening force of a first guide pin reset spring and a first large piston support spring, the lower surface of the first piezoelectric crystal is tightly attached to the upper surface of the first control valve rod, the lower surface of the first control valve rod is tightly attached to the upper surface of the first large piston, the upper end of the first sleeve is provided with two outlets, namely a thick outlet and a thin outlet, the lower end of the first large piston is a communicated closed cavity, the lower end of the first large piston is arranged in a thick outlet of the first sleeve, a first large piston supporting spring is arranged between a first large piston flange and the first sleeve to ensure that the first large piston cannot integrally enter the sleeve, the first sleeve is filled with first hydraulic oil with certain pressure, a first small piston is arranged above a thin outlet of the first sleeve, the lower end of the first small piston is arranged in the first small piston, a first small piston supporting spring is arranged between the first small piston flange and the first sleeve to ensure that the first small piston cannot integrally enter the first sleeve, a first sealing ring is arranged between the side surfaces of the first large piston and the inner wall of the first sleeve to prevent leakage of the first hydraulic oil in the first sleeve, a hydraulic amplifier I is integrally arranged above a partition plate in the valve body, the valve seat and the valve body are fixedly connected together through bolts, the matching surface between the valve seat and the valve body is sealed through a sealing rubber ring, the valve seat is provided with pressure stabilizing cavities at the lower end of the central position of the valve core and two ends close to a sealing ring belt, the pressure stabilizing cavities at the lower end of the central position of the valve core are communicated with a gas space inside the valve core assembly, and the pressure stabilizing cavities at the two ends of the valve seat are communicated with a diversion cavity inside the valve body; the first valve core assembly comprises a first guide pin, a first armature, a first spring seat, a first bottom plate, a first valve core, a first armature return spring, a first gasket and a first fastening bolt, wherein in order to ensure that the first guide pin moves stably, a plurality of first small pistons are symmetrically arranged below the first guide pin, a plurality of corresponding hydraulic amplifiers I are arranged below the first guide pin, the symmetrical number is an even number, under the action of the first small piston support spring, the upper surface of the first small pistons is tightly attached to the lower surface of the first guide pin in the first valve core assembly, the center of the first guide pin is provided with a first pressure balance hole, the lower end of the first guide pin is fixed with the first armature through threaded connection, the first armature is connected with the first bottom plate and the first valve core through the first fastening bolt, a first layer of first gasket is arranged between the first armature and the first bottom plate, four pressure balance grooves are formed above the first bottom plate, the first small pistons are arranged above the first bottom plate, the first pistons are in contact with the lower surfaces of the first valve core and the first valve core, the first valve core is in the first valve core assembly, and the lower surfaces of the first valve core assembly are respectively contacted with the first valve seat and the lower surfaces of the first valve core assembly; the fuel gas vertically flows into the valve body through the air inlet, vertically flows along the air inlet cavity and flows through holes at two ends of the upper partition plate of the valve body, and because of the existence of the first pressure balance groove on the first bottom plate and the first pressure balance hole on the first guide pin in the first valve core assembly, the internal space of the first valve core assembly is communicated with the external space, and a part of fuel gas flows into the internal space of the first valve core assembly and the upper space of the first valve core assembly, so that the internal space of the first valve core assembly, the upper space of the first valve core assembly and the pressure stabilizing cavity at the central lower ends of the first valve core and the second valve core are filled; the rest of the fuel gas flows into the valve body along the flow guide cavity, one part of the fuel gas flows into the valve body through the axial air inlet holes, the first air inlet ring cavity and the second air inlet ring cavity with certain depth are filled around the multi-channel sealing ring belt, and the other part of the fuel gas fills the pressure stabilizing cavity at the center and two ends of the valve seat and the surrounding space of the first valve core and the second valve core. When the first piezoelectric crystal is not electrified, the surface of the first valve core is attached to the surface of the valve seat, and a first air inlet ring cavity on the first valve core is not communicated with a ring cavity near an air outlet ring belt on the valve seat; after the first piezoelectric crystal is electrified, the first piezoelectric crystal stretches, the first valve core assembly is driven to move upwards after being amplified by the hydraulic amplifier I, the surface of the first valve core is separated from the surface of the valve seat, at the moment, the first air inlet ring cavity is communicated with the annular cavity near the air outlet annular band, the lifting and seating of the first valve core control the on-off between the first air inlet ring cavity and the annular cavity near the air outlet annular band, the control mode of the second piezoelectric crystal is the same as that of the first piezoelectric crystal, and the lifting and seating of the second valve core control the on-off between the second air inlet ring cavity and the annular cavity near the air outlet annular band.
Claims (3)
1. A combined double-piezoelectric fuel gas injection valve is characterized in that: the valve seat is fixed below the valve body and forms a valve space with the valve body, the fixed block is fixed above the inside of the valve body, a first straight groove and a second straight groove are formed in the middle of the fixed block, the first piezoelectric crystal is installed in the first straight groove, the second piezoelectric crystal is installed in the second straight groove, a partition plate is arranged in the middle of the valve body, the first hydraulic amplifier and the second hydraulic amplifier are arranged above the partition plate, the first valve core assembly and the second valve core assembly are arranged below the partition plate, and a first through hole, a second through hole and a vent hole are respectively formed in the partition plate;
the first hydraulic amplifier comprises a first large piston, a first small piston and a first sleeve, wherein the first sleeve is arranged on a partition plate, a first thick outlet is formed in the end part of the upper end of the first sleeve, a first thin outlet is formed in the inner side of the end part of the upper end of the first sleeve, the first large piston is arranged in the first thick outlet, the first small piston is arranged in the first thin outlet, a first large piston supporting spring is arranged between the flange of the first large piston and the first sleeve, a first small piston supporting spring is arranged between the flange of the first small piston and the first sleeve, hydraulic oil is filled in the first sleeve below the first large piston and the first small piston, a first guide pin penetrates through a first through hole of the partition plate, a first control valve rod is arranged above the first guide pin, a first guide pin reset spring is arranged between the first guide pin and the first control valve rod, the upper surface of the first control valve rod is attached to the first piezoelectric crystal, the lower surface of the first control valve rod is attached to the upper surface of the first large piston, and the upper surface of the first small piston is attached to the first guide pin; the first valve core assembly comprises a first armature, a first spring seat, a first bottom plate and a first valve core, wherein the first armature, the first bottom plate and the first valve core are arranged from top to bottom and are simultaneously connected together through a fastening bolt, the first spring seat is positioned outside the first armature and forms an annular groove with the first armature, the lower surface of a partition plate is provided with the first annular groove and a second annular groove, two ends of a first armature return spring are respectively arranged in the first annular groove of the partition plate and the annular groove of the first spring seat, a first guide pin is fixed with the first armature, a first pressure balance hole is arranged in the first guide pin, a first pressure balance groove is arranged on the first bottom plate, the first valve core is of a hollow structure, a first central pressure stabilizing cavity is arranged on a valve seat below the first valve core, the first pressure balance hole, the first pressure balance groove, a hollow part of the first valve core and the first central pressure stabilizing cavity are communicated to form a first inner space, a first sealing ring belt is arranged on the first valve core, and a first gas ring belt forms a first gas inlet cavity;
the second hydraulic amplifier comprises a second large piston, a second small piston and a second sleeve, wherein the second sleeve is arranged on a partition plate, a second thick outlet is arranged at the end part of the upper end of the second sleeve, a second thin outlet is arranged at the inner side of the end part of the upper end of the second sleeve, the second large piston is arranged in the second thick outlet, the second small piston is arranged in the second thin outlet, a second large piston supporting spring is arranged between the flange of the second large piston and the second sleeve, a second small piston supporting spring is arranged between the flange of the second small piston and the second sleeve, hydraulic oil is filled in the second sleeve below the second large piston and the second small piston, a second guide pin penetrates through a second through hole of the partition plate, a second control valve rod is arranged above the second guide pin, a second guide pin reset spring is arranged between the second guide pin and the second control valve rod, the upper surface of the second control valve rod is attached to the second piezoelectric crystal, the lower surface of the second control valve rod is attached to the upper surface of the second large piston, and the upper surface of the second small piston is attached to the second guide pin; the second valve core assembly comprises a second armature, a second spring seat, a second bottom plate and a second valve core, wherein the second armature, the second bottom plate and the second valve core are arranged from top to bottom and are connected together through fastening bolts, the second spring seat is positioned outside the second armature and forms an annular groove with the second armature, two ends of a second armature return spring are respectively arranged in the second annular groove of the baffle plate and the annular groove of the second spring seat, a second guide pin is fixed with the second armature, a second pressure balance hole is arranged in the second guide pin, a second pressure balance groove is arranged on the second bottom plate, the second valve core is of a hollow structure, a second central pressure stabilizing cavity is arranged on the valve seat below the second valve core, the second pressure balance hole, the second pressure balance groove, the hollow part of the second valve core and the second central pressure stabilizing cavity are communicated and form a second inner space, a second sealing ring belt is arranged on the second valve core, and a second ring belt forms a second ring cavity;
the first hydraulic amplifier and the second hydraulic amplifier are arranged side by side, and the first valve core assembly and the second valve core assembly are arranged side by side; the valve seat is provided with an air outlet ring belt, the air outlet ring belt is positioned below the first annular cavity and the second annular cavity, and an air outlet is arranged below the air outlet ring belt.
2. The combination dual piezoelectric fuel gas injection valve of claim 1, wherein: the outer end of the valve seat is provided with an end pressure stabilizing cavity.
3. A combined double piezoelectric fuel gas injection valve according to claim 1 or 2, characterized in that: an air inlet is formed between the upper part of the fixed block and the valve body, an air inlet cavity is formed between the middle lower part of the fixed block, the first hydraulic amplifier, the second hydraulic amplifier and the valve body, a diversion cavity is formed between the first valve core assembly and the second valve core assembly and between the first valve core assembly and the valve body, the air inlet cavity, the vent holes and the diversion cavity are communicated and form an external space, the external space is communicated with the first internal space and the second internal space, a first axial air inlet hole is formed in the first valve core, and a second axial air inlet hole is formed in the second valve core;
the fuel gas vertically flows into the valve body through the air inlet and vertically flows along the air inlet cavity until flowing through the vent holes, a part of the fuel gas flows into the inner space of the first valve core assembly and the second valve core assembly, the first central pressure stabilizing cavity and the second central pressure stabilizing cavity, and the rest of the fuel gas continuously flows along the flow guiding cavity to fill the end pressure stabilizing cavity at the outer end of the valve seat and the surrounding space of the first valve core and the second valve core;
when the first piezoelectric crystal works independently and is not electrified, a first sealing ring belt on the first valve core is tightly matched with the upper surface of the valve seat, and gas fills the inner space of the valve body of the gas injection valve; after the first piezoelectric crystal is electrified, the first piezoelectric crystal is excited by current to extend so as to push the first large piston to move downwards, hydraulic oil in the first sleeve is compressed, the first small piston moves upwards under the action of hydraulic oil pressure, the first guide pin also moves upwards to drive the first valve core assembly to move upwards, the gas injection valve is opened, the gas circuit is opened until the hydraulic oil pressure in the first sleeve returns to an initial state, the first large piston and the first small piston do not move any more, the first valve core assembly is stopped, gas flows in from a first axial air inlet hole on the first valve core, and flows out vertically after being guided through a gas outlet through a gap between the first valve core and a valve seat through a first gas inlet ring cavity; after the piezoelectric crystal is powered off, the piezoelectric crystal is shortened, the first large piston returns to the initial position under the action of the first large piston supporting spring, the pressure of hydraulic oil in the first sleeve is reduced, the first guide pin moves downwards under the action of the first guide pin resetting spring, the first small piston and the first valve core assembly move downwards along with the first large piston and the first small piston until the pressure of the hydraulic oil in the first sleeve returns to the initial state, the first large piston and the first small piston return to the initial position, the first valve core assembly returns to the initial position, the surface of the first valve core is attached to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed;
when the second piezoelectric crystal works independently and is not electrified, a second sealing ring belt on the second valve core is tightly matched with the upper surface of the valve seat, and the gas fills the inner space of the valve body of the gas injection valve; after the second piezoelectric crystal is electrified, the second piezoelectric crystal is excited by current to extend so as to push the second large piston to move downwards, hydraulic oil in the second sleeve is compressed, the second small piston moves upwards under the action of hydraulic oil pressure, the second guide pin also moves upwards to drive the second valve core assembly to move upwards, the gas injection valve is opened, the gas circuit is opened until the hydraulic oil pressure in the second sleeve returns to an initial state, the second large piston and the second small piston do not move any more, the second valve core assembly is stopped, gas flows in through a second axial air inlet hole on the second valve core, and flows out vertically after being guided through a gas outlet through a gap between the second valve core and a valve seat through a second air inlet ring cavity; after the piezoelectric crystal is powered off, the piezoelectric crystal is shortened, the second large piston returns to the initial position under the action of the second large piston supporting spring, the pressure of hydraulic oil in the second sleeve is reduced, the second guide pin moves downwards under the action of the second guide pin resetting spring, the second small piston and the second valve core assembly move downwards along with the second guide pin until the pressure of the hydraulic oil in the second sleeve returns to the initial state, the second large piston and the second small piston return to the initial position, the second valve core assembly returns to the initial position, the surface of the second valve core is attached to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed;
when the first piezoelectric crystal and the second piezoelectric crystal are operated in combination, the operation is the same as that when they are operated alone.
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2017
- 2017-06-28 CN CN201710504566.1A patent/CN107061055B/en active Active
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| EP1273791A2 (en) * | 2001-07-03 | 2003-01-08 | CRT Common Rail Technologies AG | Fuel injection valve for internal combustion engines |
| DE102012205564A1 (en) * | 2011-04-05 | 2012-10-11 | Denso Corporation | Fuel injection valve for directly injecting e.g. compressed natural gas into combustion chamber of direct ignition engine, has seal element brought in contact with body-upstream side control structure portion while closing fuel flow chamber |
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