CN107420224B

CN107420224B - Integrated cross ring groove gas fuel injection mixing device with piezoelectric actuator

Info

Publication number: CN107420224B
Application number: CN201710504572.7A
Authority: CN
Inventors: 董全; 倪昊; 宋恩哲; 范立云; 马修真
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2023-05-30
Anticipated expiration: 2037-06-28
Also published as: CN107420224A

Abstract

The invention aims to provide an integrated cross ring groove gas fuel injection mixing device with a piezoelectric actuator, wherein gas fuel is conveyed to a system through a pipeline and firstly passes through a fuel injection valve, and the actuator controls a valve core to control valve opening and closing; the stability of valve opening and closing can be ensured through the guide pin, the pressure balance hole, the pressure balance groove and the pressure stabilizing cavity, and the response of system air supply and air interruption is enhanced; the high flow is realized by a mixed air inlet mode of direct air inlet of the main air groove in the valve and air inlet of the circumferential air-filling holes, and meanwhile, air flow interference can be avoided, and the air supply stability of the system is realized; the fuel can be distributed in the whole system through the cavity structure of the fuel diffusion pipe, so that the continuity and the responsiveness of the air supply system are realized; through the branch pipe chute structure, the ejected gas fuel forms vortex, promotes the mixing degree of fuel and air, is favorable for combustion, and improves the working performance of the system.

Description

Integrated cross ring groove gas fuel injection mixing device with piezoelectric actuator

Technical Field

The invention relates to a fuel injection mixing device, in particular to a fuel injection mixing device of a gas engine.

Background

The consumption of the internal combustion engine to the energy is continuously increased, the pollution of the exhaust to the environment is also increasingly serious, and the natural gas engine is paid attention to with good economy, lower NOx and particulate matter emission. Therefore, a plurality of gas fuels taking natural gas as the main fuel for the engine are important research points of a plurality of scientific researchers at home and abroad, and the gas fuel engine is also an object of extensive research. Each portion through which fuel and air flow has a significant impact on the performance of the gas-fuelled engine and thus the air intake system affects to a large extent the degree of fuel and air mixing uniformity of the natural gas engine, which in turn affects the combustion stability of the natural gas engine. A complete air intake system comprises a plurality of parts from a fuel injection valve to an air intake manifold to a cylinder air valve and the like. The same requirement for the gaseous fuel and the liquid fuel is that the injection flow is large, the injection efficiency is high, the injection is stable, the responsiveness is good, the flow of the gaseous fuel and the air is good, and the gaseous fuel is different from the liquid fuel, so that the gaseous fuel and the air can be fully mixed before entering the cylinder, thereby improving the fuel combustion efficiency and saving the energy consumption.

Disclosure of Invention

The invention aims to provide an integrated cross ring groove gas fuel injection mixing device with a piezoelectric actuator, which has the advantages of quick fuel supply response, high stability and large flow.

The purpose of the invention is realized in the following way:

the invention relates to an integrated cross ring groove gas fuel injection mixing device with a piezoelectric actuator, which is characterized in that: comprises a fuel injection valve, a gas hood and a fuel diffusion pipe;

the fuel injection valve comprises a valve body, a valve seat, a valve rod, a piezoelectric crystal, a hydraulic amplifier, a baffle plate and a valve core assembly, wherein a fixed block is fixed above the valve body, a straight slot is formed in the middle of the fixed block, the piezoelectric crystal is arranged in the straight slot, the valve body is fixed on the valve seat, the baffle plate is arranged in the valve body, the hydraulic amplifier is arranged above the baffle plate, the valve core assembly is arranged below the baffle plate, a valve space is formed between the valve body below the baffle plate and the valve seat, the hydraulic amplifier comprises a large piston, a small piston and a sleeve, the sleeve is arranged on the baffle plate, the center of the upper end of the sleeve is a thick outlet, the end part of the upper end of the sleeve is a thin outlet, the large piston is arranged in the thick outlet, the small piston is arranged in the thin outlet, a large piston supporting spring is arranged between the flange of the large piston and the sleeve, a small piston supporting spring is arranged between the flange of the small piston and the sleeve, hydraulic oil is filled in the sleeve below the large piston and the small piston, the upper surface of the large piston is attached to the lower surface of the piezoelectric crystal, the outer part of the large piston is provided with a circular ring disc, the upper surface of the small piston is attached to the lower surface of the circular ring disc, grooves are formed in the circular ring disc and the fixed block, two ends of a return spring are respectively arranged in the grooves of the circular ring disc and the fixed block, the valve core assembly comprises an armature, a spring seat, a bottom plate, a valve core, the armature, the bottom plate and the valve core are simultaneously connected together through fastening bolts from top to bottom, the spring seat is positioned outside the armature and forms an annular groove with the armature, the lower surface of the partition plate is provided with an annular groove, two ends of the return spring are respectively arranged in the annular groove of the partition plate and the annular groove of the spring seat, a pressure balance hole is formed in the center of the armature, a pressure balance groove is formed in the bottom plate, the valve core is of a hollow structure, a central pressure stabilizing cavity is formed in a valve seat below the valve core, an end pressure stabilizing cavity is formed at the outer end of the valve seat, the pressure balance hole, the pressure balance groove, the hollow part of the valve core and the central pressure stabilizing cavity are communicated to form an inner space, the valve core is provided with a sealing ring belt which forms an air inlet ring cavity, the valve seat is provided with an air outlet ring belt and a guide block, the guide block is positioned around the valve core, the air outlet ring belt is positioned below the air inlet ring cavity, an air outlet is arranged below the air outlet ring belt, a through hole is arranged on the partition plate, the middle part of the valve rod penetrates through the through hole, the upper part of the valve rod is connected with the circular ring disc, and the lower part of the valve rod is fixed with the armature through a clamp spring;

the head end of the gas hood is arranged below the gas outlet, the tail end of the gas hood is connected with a fuel diffusion pipe, the fuel diffusion pipe is positioned in the gas inlet manifold, a gas pipe ring groove is arranged on the fuel diffusion pipe and comprises a first gas pipe ring groove and a second gas pipe ring groove, the diameters of the fuel diffusion pipes are in step alternation, the first gas pipe ring groove is positioned at a position where the diameters of the fuel diffusion pipes are relatively small, the second gas pipe ring groove is positioned at a position where the diameters of the fuel diffusion pipes are relatively large, and the first gas pipe ring groove and the second gas pipe ring groove are respectively arranged circumferentially and are staggered by 90 degrees.

The invention may further include:

1. the gas hood is a tapered spray pipe, the cross-sectional area of the head end of the gas hood is larger than that of the tail end of the gas hood, and the cross-sectional axes of the head end and the tail end of the gas hood are 90 degrees each other.

2. The valve body is provided with a protruding part, the protruding part is provided with an air inlet, a flow guide cavity is arranged in the valve body below the air inlet, the air inlet and the flow guide cavity are communicated and form an external space, the external space is communicated with the internal space, and the valve core is provided with an axial air inlet;

the fuel gas vertically flows into the flow guiding cavity through the air inlet, a part of the fuel gas flows into the inner space and the central pressure stabilizing cavity of the valve seat, the rest of the fuel gas flows into the upper part of the valve core, a part of the fuel gas flows through the axial air inlet hole to fill the air inlet ring cavity on the valve core, and the other part of the fuel gas flows into the end pressure stabilizing cavity at the outer end of the valve seat;

when the piezoelectric crystal is not electrified, a sealing ring belt on the valve core is tightly matched with the upper surface of the valve seat, and the gas fills the external space and the internal space inside the valve body of the gas injection valve; after the piezoelectric crystal is electrified, the piezoelectric crystal is excited by current to extend so as to push the large piston to move downwards, hydraulic oil in the sleeve is compressed, the small piston moves upwards under the action of hydraulic oil pressure, the valve rod also moves upwards, the valve core assembly is driven to move upwards under the fixing action of the clamp spring until the hydraulic oil pressure in the sleeve returns to an initial state, the small piston does not move any more, the valve core assembly stops, fuel gas flows in from an axial air inlet hole on the valve core, flows into an air inlet bent pipe and an air pipe through an air inlet ring cavity, is guided by an air outlet through a gap between the valve core and a valve seat, and vertically flows into an air inlet manifold from the end part of the air pipe, a first type air pipe ring groove and a second type air pipe ring groove; after the piezoelectric crystal is powered off, the piezoelectric crystal is shortened, the large piston returns to the initial position under the action of the large piston supporting spring, the pressure of hydraulic oil in the sleeve is reduced, the annular disc and the small piston move downwards under the action of the reset spring, the valve rod and the valve core assembly move downwards along with the annular disc and the small piston until the pressure of the hydraulic oil in the sleeve returns to the initial state, the large piston and the small piston return to the initial position, the valve core assembly returns to the initial position, the surface of the valve core is attached to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed.

The invention has the advantages that: according to the invention, a large flow is realized by a mixed air inlet mode of direct air inlet of the main air groove in the valve and air inlet of the circumferential air-filling holes, and meanwhile, air flow interference can be avoided, and the air supply stability of the system is realized; the fuel can be distributed in the whole system through the cavity structure of the fuel diffusion pipe, so that the continuity and the responsiveness of the air supply system are realized; through the branch pipe chute structure, the ejected gas fuel forms vortex, promotes the mixing degree of fuel and air, is favorable for combustion, and improves the working performance of the system.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a general schematic diagram of a fuel injection valve;

FIG. 3 is a schematic diagram of a valve cartridge assembly;

FIG. 4 is an external view of a fuel diffusion tube;

FIG. 5a is a view B-B and FIG. 5B is a view C-C;

fig. 6 is a flow diagram of a gaseous fuel.

Detailed Description

The invention is described in more detail below, by way of example, with reference to the accompanying drawings:

referring to fig. 1 to 6, an integrated cross ring groove gas fuel injection mixing device with a piezoelectric actuator in the present invention is divided into a fuel injection valve 1, a connecting gas cap 2 and a fuel diffusion tube 3. The fuel injection valve 1 mainly comprises a fixed block 4, a piezoelectric crystal 5, a valve body 6, a return spring 7, a large piston 8, a large piston supporting spring 9, a sealing ring 10, a sleeve 11, a sealing rubber ring 12, a sealing rubber ring 13, a pressure stabilizing cavity 14, a positioning bolt 15, a sealing rubber ring 16, a circular ring disk 17, a valve rod 18, a small piston supporting spring 19, a small piston 20, hydraulic oil 21, a baffle 22, a clamp spring 23, a valve core assembly 24, a guide block 25, an air outlet ring belt 26, a valve seat 27, an armature 28, a spring seat 29, a bottom plate 30, a valve core 31, a sealing ring belt 32, a pressure balance hole 33, an armature return spring 34, a gasket 35, a pressure balance groove 36 and a fastening bolt 37, wherein one end close to the center of the valve body 6 is provided with a gas inlet 38 and a guide cavity 39, the other end close to the center of the valve body 6 is provided with holes with a certain depth up and down along the axial direction, the two holes are separated by a baffle 21 with a certain depth, the hole space below the baffle 22 is communicated with a diversion cavity 39, the fixed block 4 is connected with the valve body 6 by a positioning bolt 15, so that the fixed block is fixed at the central position of the top end of the hole above the baffle 22, the matching surface between the fixed block 4 and the valve body 7 is kept sealed by a sealing rubber ring 16, the fixed block 4 is provided with a straight slot with a certain depth at the central position, the piezoelectric crystal 5 is arranged in the straight slot, a through hole with a smaller diameter is arranged above the straight slot and is used for arranging a connecting wire of the piezoelectric crystal 5 and a control unit outside the valve body 6, the lower surface of the piezoelectric crystal 5 is contacted with the upper surface of the large piston 8, under the pretightening force of a large piston supporting spring 9, the lower surface of the piezoelectric crystal 5 is tightly attached with the upper surface of the large piston 8, the upper end of the sleeve 11 is provided with a plurality of outlets, the central outlet is a thick outlet, the peripheral outlet is a thin outlet, the lower end of the large piston 8 is arranged in a thick outlet in the center of the sleeve 11, the large piston supporting spring 9 is positioned between the flange of the large piston 8 and the sleeve 11, the large piston 8 cannot integrally enter the sleeve 11, the sleeve 11 is filled with hydraulic oil 21 with certain pressure, the small piston 20 is arranged above the thin outlets at the two ends of the sleeve 11, the lower end of the small piston 20 is arranged therein, the small piston supporting spring 19 is arranged between the flange of the small piston 20 and the sleeve 11, so as to ensure that the small piston 20 cannot integrally enter the sleeve 11, the sealing rings 10 are arranged between the side surfaces of the large piston 8 and the small piston 20 and the inner wall of the sleeve 11, so as to prevent leakage of the hydraulic oil 21 in the sleeve 11, and the large piston 8, the small piston 20, the large piston supporting spring 9 and the small piston supporting spring 19 form a piezoelectric crystal hydraulic amplifier together with the sleeve 11, the hydraulic amplifier is arranged above a baffle plate 22 in the valve body 6 as a whole, under the pretightening force of a small piston supporting spring 19, the upper surface of the small piston 20 is tightly attached to the lower surface of a circular disc 17, two ends of a return spring 7 are respectively arranged in grooves on a fixed block 1 and the circular disc 17, two ends of the circular disc 17 are provided with round holes, threads are arranged in the holes, the circular disc 17 is connected with a valve rod 18 by the threads, the valve rod 18 is arranged in a through hole in the baffle plate 21, the lower end of the valve rod 18 is fixed with the upper end of a valve core assembly 24 by a clamp spring 23, the valve core assembly 24 and a valve seat 27 are sequentially arranged below the baffle plate 22 from top to bottom, the valve seat 27 is fixedly connected with the valve body 6 by bolts, and the matching surfaces between the two are sealed by a sealing rubber ring 13, the valve seat 27 is provided with pressure stabilizing cavities 14 at the center and at the two ends close to the sealing ring belt 29, the pressure stabilizing cavity 14 at the center of the valve seat 27 is communicated with the gas space inside the valve core assembly 24, and the pressure stabilizing cavities 14 at the two ends of the valve seat 27 are communicated with the space inside the valve body 7. The gas hood 2 has the function of dividing the original mixed gas passage into two parts for respectively circulating gas fuel and air, adopts a large round corner structure, avoids throttling loss caused by the corner structure, and enhances the gas supply capacity of the system. One end of the gas hood 2 is tightly connected with the outlet of the fuel injection valve 1, the other end is tightly connected with the fuel diffusion pipe 3, and fuel is sprayed out from the fuel injection valve 1 and enters the diffusion pipe 3 through the gas hood 2. When the armature of the fuel diffusion tube 3 is sucked, fuel gas enters the bent section 38 of the air tube structure from the fuel gas injection valve 1, and the diameter of the bent section 38 of the air tube is gradually reduced, so that the bent air tube acts like a tapered spray tube, the fuel gas sprayed by the fuel gas injection valve 1 enters the straight section 40 of the air tube structure after being accelerated by the tapered spray tube, the flow rate of the fuel gas is higher, annular grooves 40a and 40b which are circumferentially arranged and form 90 degrees with each other are formed in the straight section of the air tube, the fuel gas flows into the air inlet manifold through the annular grooves, and is mixed with air in the air inlet manifold after being torn and turbulent. The engine intake manifold 41 outside the air pipe simultaneously sucks air and mixes with turbulent flow of the gas ejected through the ring grooves 40a and 40b, so that the mixing effect is more uniform, and meanwhile, the tail end of the straight section 40 of the air pipe is close to the engine intake valve, so that the intake response is improved, and the residual gas in the intake passage is remarkably reduced. Fig. 3 shows that the valve core assembly 24 is located in the valve body 6 and consists of an armature 28, a spring seat 29, a bottom plate 30, a valve core 31, an armature return spring 34, a gasket 35 and a fastening bolt 37, the armature 28 is connected with the bottom plate 30 and the valve core 31 through the fastening bolt 37, a layer of gasket 35 is arranged between the armature 28 and the bottom plate 30, a pressure balance hole 33 is formed in the armature 28, four pressure balance grooves 36 are formed above the bottom plate 30, the pressure balance hole 33 in the center of the armature 28 is matched with the pressure balance grooves 36 in the bottom plate 30, so that the inner space and the outer space of the valve core assembly 24 are communicated, the internal and external air paths are balanced, the internal and external fuel gas of the valve core assembly 24 has no pressure difference, the external fuel gas is prevented from being subjected to additional axial force during movement, the spring seat 29 is installed above the bottom plate 30, the side surface of the internal fuel gas is contacted with the side surface of the armature 28, two ends of the armature return spring 34 are respectively arranged on annular grooves of the partition 22 and the spring seat 29, the valve core 31 consists of a valve core main body and a sealing ring 32, four guide blocks are circumferentially fixed on the valve seat 27, and the valve seat 24 are guaranteed to be vertical. When the piezoelectric crystal 2 is not electrified in the working process of the fuel gas injection valve, under the action of the armature return spring 31, the valve core assembly 21 is kept motionless at the initial position, the sealing ring belt 29 on the valve core 28 in the valve core assembly 21 is tightly matched with the upper surface of the valve seat 24, the air inlet ring cavity 38 on the valve core 28 is not communicated with the ring cavity near the air outlet ring belt 23 on the valve seat 24, and the whole space inside the valve body 3 of the fuel gas injection valve is filled with fuel gas. After the piezoelectric crystal 2 is electrified, the piezoelectric crystal 2 is excited by current to extend so as to push the large piston 5 to move downwards, the hydraulic oil 18 in the sleeve 8 is compressed, the pressure rises, under the action of the pressure of the hydraulic oil 18, the small piston 17 on a thin outlet in the sleeve 8 moves upwards, the small piston 17 is symmetrically distributed below the annular disk 14 and stably pushes the annular disk 14 to move upwards, due to the connecting effect of threads, the valve rod 15 also moves upwards, finally, under the fixing effect of the clamp spring 20, the valve core assembly 21 is driven to move upwards, during the moving process of the valve core assembly 21, external guiding is realized through the guide block 22 until the pressure of the hydraulic oil 18 in the sleeve 8 returns to an initial state, the small piston 17 does not move, the valve core assembly 21 stops, the valve core assembly 21 is maintained at the position for a period of time, fuel gas flows in through the axial air inlet holes 37 on the valve core 28, through the air inlet annular cavities 38 with a certain depth around the multiple sealing annular belts 29, and finally flows out through the air outlet 39 guide between the valve core 28 and the valve seat 24, the valve core assembly is vertically, the annular belt is used for face sealing and balanced, and the wider reliability is improved, the pressure of the fuel gas is enabled to flow in the pressure stabilizing cavity is balanced at the center of the two pressure stabilizing cavities, and the pressure stabilizing cavity is set up in the pressure stabilizing center of the pressure stabilizing cavity, and the pressure stabilizing cavity is balanced by the pressure stabilizing cavity 11; after the fuel gas is sprayed out a certain amount, the piezoelectric crystal 2 starts to be powered off, the piezoelectric crystal 2 shortens, the large piston 5 starts to return to the initial position under the action of the large piston supporting spring 6, the pressure of hydraulic oil 18 in the sleeve 8 is reduced, the annular disc 14 and the small piston 17 start to move downwards under the action of the reset spring 4, the valve rod 15 and the valve core assembly 21 move downwards along with the pressure of the hydraulic oil 18 in the sleeve 8 until the pressure of the hydraulic oil 18 returns to the initial state, the large piston 5 and the small piston 17 return to the initial position, the valve core assembly 21 correspondingly returns to the initial position at the moment, the surface of the valve core 28 is attached to the surface of the valve seat 24 and returns to the initial position again, and the fuel gas injection valve is closed and the gas path is closed.

When the armature of the gas injection valve 1 is sucked, gas enters the bent section 38 of the gas pipe structure from the gas injection valve 1, and the diameter of the bent section 38 of the gas pipe is gradually reduced, so that the bent gas pipe acts like a tapered spray pipe, the gas injected by the gas injection valve 1 enters the straight section 40 of the gas pipe structure after being accelerated by the tapered spray pipe, at the moment, the gas flow velocity is higher, annular grooves 40a and 40b which are circumferentially arranged and form 90 degrees with each other are formed in the straight section of the gas pipe, the gas flows into the air inlet manifold through the annular grooves, and is mixed with air in the manifold after the air inlet is torn and acted by turbulent flow, so that the air inlet quality is improved.

The engine intake manifold 41 outside the air pipe simultaneously sucks air and mixes with turbulent flow of the gas ejected through the ring grooves 40a and 40b, so that the mixing effect is more uniform, and meanwhile, the tail end of the straight section 40 of the air pipe is close to the engine intake valve, so that the intake response is improved, and the residual gas in the intake passage is remarkably reduced.

The invention relates to an integrated cross ring groove gas fuel injection mixing device with a piezoelectric actuator, which is divided into a fuel injection valve, a connecting gas hood and a fuel diffusion pipe. The fuel injection valve mainly comprises a fixed block, a piezoelectric crystal, a valve body, a reset spring, a large piston supporting spring, a sealing ring, a sleeve, a sealing rubber ring, a positioning bolt, a circular ring disk, a valve rod, a small piston supporting spring, a small piston, a clamp spring, a valve core assembly and a valve seat. The valve core assembly consists of an armature, a spring seat, a bottom plate, a valve core, an armature return spring, a gasket and a fastening bolt. In the working process, the piezoelectric crystal is electrified and stretched, after displacement is amplified by the hydraulic amplifier, the symmetrically arranged small pistons push the circular ring disc to move upwards steadily, and the circular ring disc drives the valve core assembly to move away from the valve seat under the external guiding action of the outer guide blocks through the valve rod, so that the gas injection function of the gas valve is realized; the invention adopts the piezoelectric crystal driving mode, effectively improves the response speed of the gas injection valve, and realizes the variable lift of the gas injection valve through different current driving modes of the piezoelectric crystal; the invention adopts a bypass air supply mode to guide the flow of the fuel gas in the valve body; the bottom end of the valve core is provided with a sealing ring belt so as to form an air inlet ring cavity, so that fuel gas is prevented from entering along the axial direction, the gas path balance is ensured, the valve seat quality is lightened, and the response speed is improved; 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; according to the invention, the pressure balance hole is arranged at the armature, the pressure balance groove is arranged at the bottom plate, so that the inner air channel and the outer air channel of the valve core assembly are balanced, the upper and lower fuel gas pressure difference of the valve core assembly is ensured, the valve core assembly is prevented from receiving additional axial force, the response speed of the fuel gas injection valve is further improved, and the control difficulty of the fuel gas injection valve is reduced. The gas cover is used for dividing the original mixed gas channel into two parts and respectively circulating the gas fuel and the air. One end of the gas hood is tightly connected with the outlet of the fuel injection valve, the other end of the gas hood is tightly connected with the fuel diffusion pipe, and fuel is sprayed out from the fuel injection valve and enters the diffusion pipe through the gas hood. An air pipe structure in an air inlet manifold of a gas engine mainly comprises a gas injection valve, an air inlet manifold, a connecting flange and an air pipe structure. The gas injection valve and the gas pipe structure are connected by adopting a flange, and the flange gasket adopts a high-temperature and high-pressure resistant metal cladding gasket so as to improve the sealing performance under various working conditions. When the armature of the gas injection valve is sucked, the gas enters the gas pipe, and the bent spray pipe is similar to the tapered spray pipe, so that the gas sprayed by the gas injection valve enters the straight section of the gas pipe structure after being accelerated by the tapered spray pipe, the flow speed of the gas is higher at the moment, the straight section of the gas pipe is provided with annular grooves which are 90 degrees each other, the gas flows out through the annular grooves and is mixed with air in the manifold, after the gas and the air are subjected to turbulent tearing action, the uniformity of the mixed gas is improved, and meanwhile, the tail end of the straight section of the gas pipe is close to the air inlet valve of the engine, so that the air inlet response is improved, and the residual gas in the air inlet passage is obviously reduced. The fuel injection valve is characterized in that a pressure balance hole is formed in the armature, and a pressure balance groove is formed in the bottom plate, so that the inner gas path and the outer gas path of the valve core assembly are balanced, no gas pressure difference between the upper part and the lower part of the valve core assembly is ensured, the valve core assembly is prevented from receiving additional axial force, the response speed of the fuel injection valve is further improved, and the control difficulty of the operation of the fuel injection valve is reduced.

The joint part of the valve core assembly and the valve seat in the fuel injection process adopts a mode that a sealing annular belt and an air outlet annular belt are distributed in a staggered mode to carry out surface sealing, and meanwhile, the large annular belt structure can reduce the structural quality, reduce the impact and improve the working stability of the system.

The invention adopts a bypass air supply mode to guide the flow of the fuel gas in the valve body; the sealing ring belt is applied to the bottom end of the valve core to form an air inlet ring cavity, so that fuel gas enters along the axial direction, on one hand, the fuel gas interference is avoided, the balance of the air path is ensured, on the other hand, the valve seat quality is lightened, and the response speed is improved

The surface structure of the gas hood part in the system adopts a larger curvature radius, so that a sharper edge angle structure is avoided, and the throttling loss of fuel in the process of spraying the fuel from the injection valve into the main body part of the gas pipe through the gas hood can be reduced. The cavity is communicated, so that fluctuation of gas pressure in the valve can be effectively restrained, the working stability of the system is improved, and the high response speed of the system is realized.

The fuel injection outlet passage part in the system consists of a main air groove in the valve body, a central hole of a valve core rib plate, a valve core sealing ring groove and a valve seat air outlet ring groove; when the fuel injection valve is in a closed state, the sealing ring grooves are in staggered contact with the air outlet ring grooves to form a sealing surface, so that fuel is prevented from entering the air inlet manifold; when the fuel injection valve is opened, fuel can enter the air outlet ring groove from the main air groove, and can also enter the air outlet ring groove from the rib plate center Kong Jingmi seal ring groove; the mixed air inlet mode increases the air inlet flow coefficient, realizes the large flow of the system, effectively improves the air supply efficiency of the air inlet system, can avoid air flow interference, and realizes the air supply stability of the whole system.

The surface structure of the gas hood part in the system adopts a larger curvature radius, so that a sharper edge angle structure is avoided, and the throttling loss of fuel in the process of spraying the fuel from the injection valve into the main body part of the gas pipe through the gas hood can be reduced.

The branch pipes in the fuel diffusion pipe in the system are uniformly arranged at the position close to the pipe wall of the gas manifold, and the like structural design can destroy an air boundary layer formed by the pipe wall when the fuel gas circulates, so that the turbulent energy of the air flow is increased, and the mixing between the fuel and the air is enhanced.

An integrated toroidal manifold wall-injection hybrid intake system with a hybrid intake gas injection valve can enhance fuel supply responsiveness by first enhancing valve element opening responsiveness by the fuel injection valve with a pilot pin and pressure balance hole structure; when the fuel injection valve is opened, fuel flows into the dye diffusion pipe through the gas hood, flows into the air inlet manifold through a series of chute effects, forms vortex, is fully mixed with air, and finally flows into the cylinder; after the fuel injection valve and the cylinder air valve are closed, the system can isolate the fuel from the air to a certain extent, so that the gas fuel which is injected from the injection valve but cannot enter the cylinder in time can be stored in the cavity of the fuel diffusion pipe to prevent diffusion loss, and after the next time the injection valve and the cylinder air valve are opened, part of the gas fuel can be rapidly supplied into the cylinder for combustion, thereby improving the fuel supply responsiveness.

Claims

1. An integrated cross ring groove gas fuel injection mixing device with a piezoelectric actuator is characterized in that: comprises a fuel injection valve, a gas hood and a fuel diffusion pipe;

2. The integrated cross-ring groove gaseous fuel injection mixing device with piezoelectric actuator of claim 1, wherein: the gas hood is a tapered spray pipe, the cross-sectional area of the head end of the gas hood is larger than that of the tail end of the gas hood, and the cross-sectional axes of the head end and the tail end of the gas hood are 90 degrees each other.

3. An integrated cross-ring groove gaseous fuel injection mixing apparatus with piezoelectric actuator according to claim 1 or 2, characterized in that: the valve body is provided with a protruding part, the protruding part is provided with an air inlet, a flow guide cavity is arranged in the valve body below the air inlet, the air inlet and the flow guide cavity are communicated and form an external space, the external space is communicated with the internal space, and the valve core is provided with an axial air inlet;