CN206816401U - Fuel gas injection valve is oriented to outside a kind of piezoelectric type of through type mixed admission - Google Patents

Abstract

The purpose of this utility model is to provide a straight-through piezoelectric type externally oriented gas injection valve with mixed intake air. The piezoelectric crystal is energized and elongated, and after the displacement is amplified by the hydraulic amplifier, the symmetrically arranged small pistons push the circular disc smoothly. As the ground moves upward, the ring disk drives the valve core assembly through the valve stem to move away from the valve seat under the external guidance of the outer guide block to realize the function of gas injection from the gas valve; the piezoelectric crystal drive method is used to effectively improve the gas flow rate. The response speed of the injection valve realizes the variable lift of the gas injection valve; the mixed air intake mode of direct air intake from the axial main air groove and air intake from the circumferential air supply hole realizes a large flow rate and effectively improves the air supply of the engine High efficiency, at the same time, it can avoid air flow interference and realize the stability of the gas path; through the multi-channel ring structure between the valve core and the valve seat, the surface sealing of the gas injection valve is realized, and the reliability is high.

Description

A Piezoelectric Outer-Guided Gas Injection Valve with Straight-through Mixed Intake

technical field

The utility model relates to a gas injection valve, in particular to a gas injection valve for a natural gas engine.

Background technique

In recent years, with the rapid growth of my country's oil consumption, oil is heavily dependent on imports. Natural gas burns cleanly and has abundant reserves in my country, making it the most likely fuel to replace diesel. In the internal combustion engine industry, energy saving and emission reduction is an inevitable trend in the development of internal combustion engines. Internal combustion engines using natural gas as the main fuel can greatly reduce emission pollution under the premise of ensuring power performance. research hotspots. As a fuel supply device for a natural gas engine, the performance of the gas injection valve directly determines the characteristics of the natural gas engine. At present, in the actual working process of the gas injection valve, the characteristics of the flexibility of the gas injection valve's injection control, the stability of the injected gas pressure, and the control accuracy will all affect the performance of the internal combustion engine. The response time of the injection valve is generally between a few milliseconds and tens of milliseconds, that is, the gas injection valve needs to have a high response speed to meet the requirements of its rapid switching. area to ensure sufficient gas volume for the internal combustion engine. Therefore, the development of large-flow gas injection valves with variable lift, stable air pressure, high control precision, fast response speed, and high reliability is the current development trend of gas injection valves for natural gas engines.

Contents of the invention

The purpose of the utility model is to provide a straight-through piezoelectric type externally guided gas injection valve with variable lift, fast response speed, high control precision, high reliability, stable injection pressure, high-efficiency sealing, and large flow rate. .

The purpose of this utility model is achieved in that:

The utility model is a straight-through piezoelectric type externally guided gas injection valve with mixed intake air, which is characterized in that it includes a valve body, a valve seat, a valve stem, a piezoelectric crystal, a hydraulic amplifier, a partition, and a valve core assembly, The valve seat is fixed under the valve body and forms a valve space with the valve body. A fixed block is fixed above the inside of the valve body. There is a straight groove in the middle of the fixed block. The piezoelectric crystal is installed in the straight groove, and a partition is set in the middle of the valve body. , a hydraulic amplifier is arranged above the partition, and a valve core assembly is arranged below the partition. The hydraulic amplifier includes a large piston, a small piston, and a sleeve. The sleeve is arranged on the partition, and the center of the upper end of the sleeve is a coarse outlet. The end of the upper end of the sleeve is a thin outlet, the large piston is set in the coarse outlet, the small piston is set in the thin outlet, a large piston support spring is set between the flange of the large piston and the sleeve, and the flange of the small piston is connected to the sleeve. A small piston support spring is arranged between them, and the sleeves below the large piston and the small piston are filled with hydraulic oil. The upper surface of the large piston and the lower surface of the piezoelectric crystal are bonded together. Fitted with the lower surface of the ring disc, grooves are provided in the ring disc and the fixed block, and the two ends of the return spring are respectively arranged in the grooves of the ring disc and the fixed block. The valve core assembly includes an armature, The spring seat, bottom plate, valve core, armature, bottom plate, and valve core are arranged from top to bottom and connected together by fastening bolts. The spring seat is located outside the armature and forms an annular groove with the armature. The lower surface of the partition is provided with an annular groove. The two ends of the return spring are respectively arranged in the annular groove of the diaphragm and the annular groove of the spring seat. A pressure balance hole is set in the center of the armature, a pressure balance groove is set on the bottom plate, the valve core is hollow, and the valve seat below the valve core is set. The central pressure stabilizing chamber, the pressure balance hole, the pressure balancing groove, the hollow part of the valve core and the central stabilizing chamber communicate with each other to form an internal space. The valve core is provided with a sealing ring and ribs, and the sealing ring forms a ring cavity. On the valve seat Set the air outlet ring belt and guide block, the guide block is located around the valve core, the air outlet ring belt is located under the ring cavity, the air outlet is set under the air outlet ring belt, the through hole and the air hole are respectively arranged on the partition, and the middle part of the valve stem passes through the through hole , the upper part of the valve stem is connected with the ring disc, the lower part of the valve stem is fixed together with the armature through a circlip, the upper surface of the valve core is provided with an axial main air groove, and the ribs are provided with circumferential air supply holes, and are set at the air supply holes. diversion cone angle.

The utility model can also include:

1. The outer end of the valve seat is provided with an end pressure stabilizing chamber.

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 and lower part of the fixed block and the hydraulic amplifier and the valve body, and a diversion cavity is formed between the valve core assembly and the valve body. The air port, the air intake cavity, the air hole, and the diversion cavity communicate with each other to form an external space, and the external space communicates with the internal space;

The gas flows vertically into the valve body through the air inlet, and flows vertically along the air inlet cavity until it flows through the vent hole, a part of the gas flows into the internal space of the valve core assembly and the pressure-stabilizing chamber in the center of the valve seat, and the rest of the gas continues along the guide cavity. Flow, filling the end pressure chamber at the outer end of the seat and the surrounding space of the valve core;

When the piezoelectric crystal is not energized, the sealing ring on the valve core is closely matched with the upper surface of the valve seat, and the gas fills the external space and internal space inside the valve body of the gas injection valve; after the piezoelectric crystal is energized, the piezoelectric crystal receives current Excited to elongate, pushing the large piston to move downward, the hydraulic oil in the sleeve is compressed, under the action of hydraulic oil pressure, the small piston moves upward, and the valve stem also moves upward, and under the fixing action of the circlip, drives the valve The core assembly moves upward until the hydraulic oil pressure in the sleeve returns to the initial state, the small piston no longer moves, and the valve core assembly stops accordingly, and the gas is inhaled through the mixed axial main air groove and the circumferential air supply hole. After the piezoelectric crystal is powered off, the piezoelectric crystal shortens, and under the action of the large piston supporting spring, the large piston returns to the initial position, and the pressure of the hydraulic oil in the sleeve drops. Under the action of the return spring, the ring disc and the small piston move downward, and the valve stem and valve core assembly move downward accordingly until the pressure of the hydraulic oil in the sleeve returns to the initial state, and the large piston and small piston return to the initial position , the spool assembly returns to the initial position, the surface of the spool sticks to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed.

The advantage of the utility model is that: the utility model utilizes the piezoelectric crystal to be energized and elongated, and after the displacement is amplified by the hydraulic amplifier, the symmetrically arranged small piston pushes the circular disk to move upward steadily, and the circular disk drives the valve core assembly through the valve stem. The whole body moves away from the valve seat under the action of the outer guide block on the outside to realize the gas injection function of the gas valve; the utility model adopts the piezoelectric crystal drive mode, which effectively improves the response speed of the gas injection valve and realizes the gas injection valve. The lift is variable; the utility model adopts a straight-through gas supply method to ensure sufficient supply of gas entering the valve body; through the cooperation of the pressure balance hole, pressure balance groove and pressure stabilizing chamber, the internal gas pressure of the gas injection valve can be effectively suppressed Fluctuation of the airflow, to achieve stable and reliable operation of the airflow, to achieve a high response speed; through the mixed air intake mode of direct air intake from the axial main air groove and air intake from the circumferential air supply hole, a large flow rate can be achieved, and the air supply of the engine can be effectively improved High efficiency, at the same time, it can avoid air flow interference and realize the stability of the gas path; through the multi-channel ring structure between the valve core and the valve seat, the surface sealing of the gas injection valve is realized, and the reliability is high.

Description of drawings

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

Fig. 2 is the structural representation of the valve core assembly of the present utility model;

Fig. 3 is the schematic diagram of the gas path of the present utility model;

Fig. 4 is the three-dimensional structure schematic diagram of spool;

Figure 5 is a top view of the valve seat structure.

detailed description

The utility model is described in more detail below in conjunction with accompanying drawing example:

Combining Figures 1-5, Figure 1 is a schematic diagram of the overall structure of a straight-through mixed intake piezoelectric externally guided gas injection valve of the present invention, including 1 valve body, 2 piezoelectric crystals, 3 fixed blocks, and 4 large pistons , 5 large piston support springs, 6 seal rings, 7 sleeves, 8 return springs, 9 ring discs, 10 valve stems, 11 small piston support springs, 12 small pistons, 14 retaining rings, 15 partitions, 16 spool combinations Body, 18 sealing rubber rings and 19 valve seats, the fixed block 3 is connected with the valve body 1 by threaded connection, so that it is fixed at the center position above the valve body 1, and the fixed block 3 has a straight hole with a certain depth in the center position. Groove, piezoelectric crystal 2 is arranged in it, and a through hole with a smaller diameter is opened above the straight groove, which is used to arrange the connection wire between piezoelectric crystal 2 and the control unit outside the valve body 1, the lower surface of piezoelectric crystal 2 and the large piston 4. The upper surface is in contact. Under the action of the pre-tightening force of the large piston support spring 5, the lower surface of the piezoelectric crystal 2 and the upper surface of the large piston 4 are closely attached together. The upper end of the sleeve 7 is multi-outlet, and the central outlet is a coarse outlet , the surrounding outlets are fine outlets, symmetrically arranged below the ring disc 9, the lower end is a connected closed cavity, the lower end of the large piston 4 is arranged in the thick outlet in the center of the sleeve 7, and the large piston support spring 5 is located on the large piston 4 Between the flange and the sleeve 7, it is ensured that the large piston 4 will not enter the sleeve 7 as a whole, the sleeve 7 is filled with hydraulic oil 13 with a certain pressure, and a small piston 12 is arranged above the thin outlets at both ends of the sleeve 7. The lower end of the small piston 12 is arranged in it, and a small piston support spring 11 is arranged between the flange of the small piston 12 and the sleeve 7 to ensure that the small piston 12 will not enter the sleeve 7 as a whole. A sealing ring 6 is arranged between the surface and the inner wall of the sleeve 7 to prevent leakage of the hydraulic oil 13 in the sleeve 7. The large piston 4, the small piston 12, the large piston support spring 5, and the small piston support spring 11 together with the sleeve 7 The hydraulic amplifier of the piezoelectric crystal is formed, and the hydraulic amplifier is arranged above the partition plate 15 in the valve body 1 as a whole. The lower surface of 9 is tightly fitted, and the two ends of the return spring 8 are respectively arranged in the grooves on the fixed block 3 and the ring disc 9. The two ends of the ring disc 9 are provided with round holes, and threads are provided in the holes. The ring disc 9 is connected with the valve stem 10, the valve stem 10 is arranged in the through hole in the partition 15, and its lower end is fixed together with the upper end of the valve core assembly 16 by means of a clip spring 15, and the two ends of the partition 15 are also fixed together. A vent hole 35 with a larger diameter is opened, and a valve core assembly 16 and a valve seat 19 are arranged in sequence from top to bottom under the partition plate 15. The valve seat 19 and the valve body 1 are fixedly connected together by bolts. The mating surfaces between them are sealed by a sealing rubber ring 18.

As shown in Figure 2, the spool assembly 16 of a piezo-electric outer-guided gas injection valve with straight-through mixed air intake is composed of an armature 21, a spring seat 22, a bottom plate 23, a spool 24, an armature return spring 28, a gasket 29 and fastening bolts 31, the armature 21 is connected with the bottom plate 23 and the valve core 24 through the fastening bolts 31, a layer of gasket 29 is arranged between the armature 21 and the bottom plate 23, and a pressure balance hole 27 is opened on the armature 21, There are four pressure balance grooves 30 above the bottom plate 23. The pressure balance hole 27 at the center of the armature 21 cooperates with the pressure balance groove on the bottom plate 23 to make the internal space of the valve core assembly 16 communicate with the external space, and the internal and external air paths are balanced. There is no pressure difference between the internal and external gas of the spool assembly 16, so as to avoid additional axial force during movement. The spring seat 22 is installed above the bottom plate 23, and its inner side surface is in contact with the side surface of the armature 21, and the armature resets. The two ends of the spring 28 are respectively arranged on the annular groove of the separator 15 and the spring seat 22. The valve core 24 is composed of the valve core body, ribs 25 and sealing ring belt 26. On the guide block 17, to ensure its own verticality, the movement lift of the valve core 24 is limited by the distance between the spring seat 22 and the partition 15, and the valve core assembly 16 is arranged under the partition 15 as a whole;

As shown in Figure 3, at first, the gas flows vertically into the valve body 1 through the air inlet 33, flows vertically along the air inlet chamber 34, until it flows through the vent holes 35 at both ends of the upper partition plate 15 of the valve body 1, because the gas on the armature 21 With the pressure balance hole 27 and the pressure balance groove 30 on the bottom plate 23, the internal space of the valve core assembly 16 communicates with the internal space of the valve body 1, and part of the gas will flow into the internal space of the valve core assembly 16, and then fill the valve core assembly. The internal space of the body 16 and the pressure stabilizing chamber 38 at the center of the valve seat 19 ensure that the internal and external air passages of the valve core assembly 16 are balanced without pressure difference, and avoid additional axial force; The inside of the body 1 is filled with the pressure stabilizing chamber 38 at the periphery of the valve seat 19 and the surrounding space of the valve core 24 . When the piezoelectric crystal 2 is not energized, the lower surface of the valve core 24 is attached to the upper surface of the valve seat 19, and the annular cavity between the valve core 24 and the valve seat 19 is not connected; after the piezoelectric crystal 2 is energized, the piezoelectric crystal 2 elongates , after being amplified by the hydraulic amplifier, the spool assembly 16 is driven to move upwards, and the lower surface of the spool 24 is separated from the upper surface of the valve seat 19. At this time, the gas path is opened, and the gas is rapidly released from the axial main gas groove 41 and the circumferential gas supply hole 37. The mixed intake air flows in through the multi-channel annular cavity 39 between the valve core 24 and the valve seat 19, and finally flows out vertically through the air outlet 40. The lifting and seating of the valve core 24 control the on-off between the annular cavity 39.

During the working process of the gas injection valve, when the piezoelectric crystal 2 is not energized, under the action of the armature return spring 28, the spool assembly 16 remains stationary at the initial position, and the sealing ring on the spool 24 in the spool assembly 16 The belt 26 is closely matched with the gas outlet annular belt 20 on the valve seat 19, the annular cavity 39 between the valve core 24 and the valve seat 19 is not communicated, and the gas is filled with the entire space inside the valve body 1 of the gas injection valve. After the piezoelectric crystal 2 is energized, the piezoelectric crystal 2 is excited by the current to elongate, pushing the large piston 4 to move downward, the hydraulic oil 13 in the sleeve 7 is compressed, and the pressure rises. Under the action of the pressure of the hydraulic oil 13, The small piston 12 on the thin outlet in the sleeve 7 moves upwards, and the small pistons 12 are symmetrically distributed under the circular disc 9, and push the circular disc 9 to move upward smoothly. Due to the connection effect of the thread, the valve stem 10 also moves upward. Finally, under the fixing action of the circlip 15, the spool assembly 16 is driven to move upwards. During the movement of the spool assembly 16, the guide block 17 realizes the external guidance until the pressure of the hydraulic oil 13 in the sleeve 7 returns. In the initial state, the small piston 12 no longer moves, and the valve core assembly 16 stops accordingly, and the valve core assembly 16 maintains this position for a period of time. The mixed intake air flows in through the multi-channel annular cavity 39 between the valve core 24 and the valve seat 19, and finally flows out vertically after being guided by the air outlet 40. The multi-channel annular belt between the valve core 24 and the valve seat 19 is surface sealed, The stable pressure is balanced, and the wide ring area can reduce the impact and improve the reliability. The center and the periphery of the valve seat 19 are provided with a stable pressure chamber 38, so that the surrounding gas can be ventilated evenly and the air pressure is balanced during the flow; After a certain amount is sprayed, the piezoelectric crystal 2 starts to be powered off, and the piezoelectric crystal 2 shortens. Under the action of the large piston support spring 5, the large piston 4 begins to return to the initial position, and the pressure of the hydraulic oil 13 in the sleeve 7 drops. Under the action of the return spring 8, the annular disk 9 and the small piston 12 start to move downward, and the valve stem 10 and the valve core assembly 16 move downward accordingly until the pressure of the hydraulic oil 13 in the sleeve 7 returns to the initial state, and the large Piston 4 and small piston 12 return to the initial position. At this time, the valve core assembly 16 also returns to the initial position correspondingly. The lower surface of the valve core 24 is attached to the upper surface of the valve seat 19, and returns to the initial position, and the gas injection valve is closed. , the gas path is closed.

It can be seen from the above working process that the utility model is a straight-through mixed intake piezoelectric externally guided gas injection valve. During the working process, the piezoelectric crystal 2 is energized and elongated, and the displacement is amplified by the hydraulic amplifier, and the symmetrical arrangement The small piston 12 pushes the circular disk 9 to move upwards smoothly, and the circular disk 9 drives the valve core assembly 16 to move away from the valve seat 19 under the external guidance of the outer guide block 17 through the valve stem 10, so as to realize the gas injection of the gas valve. function; the utility model adopts the piezoelectric crystal 2 driving method, which effectively improves the response speed of the gas injection valve and realizes the variable lift of the gas injection valve; the utility model adopts a straight-through gas supply mode, which ensures that the valve Sufficient supply of gas in the body 1; the verticality of the valve core 24 is ensured by the outer guide structure; a pressure balance hole 27 is opened in the center of the armature 21 and a certain number of pressure balance grooves 30 are opened on the bottom plate 23 to make the valve core combined The internal and external air path pressure at the body 16 is easier to achieve balance, avoiding the valve core assembly 16 from being subjected to axial force, improving its response speed, and reducing the difficulty of control; the structure of multiple circumferential air supply holes 37 is opened on the fin 25 of the valve core 24 , the lower surface of the valve core 24 and the upper surface of the valve seat 19 are provided with multiple annular cavities 39 to increase the effective flow area, reduce the quality of the valve core 24, and improve reliability; a certain angle guide is set at the circumferential air hole 37 of the valve core 24 The flow cone angle is 32, which reduces the flow loss and increases the flow coefficient; the utility model adopts the mixed air intake mode of the direct air intake from the axial main air groove 41 and the air intake from the circumferential air supply hole 37, which increases the air intake flow coefficient and realizes a large flow rate , which effectively improves the gas supply efficiency of the gas injection valve, and at the same time avoids air flow interference, and realizes the balance and stability of the gas path; the valve core 24 and the valve seat 19 adopt a multi-channel sealing ring 26 and an air outlet ring 20 structure to realize The surface of the gas injection valve is sealed, the pressure is balanced, and the wide ring area can reduce the impact and improve the reliability; the center and the periphery of the valve seat 19 are provided with a pressure stabilizing chamber 38, which can effectively suppress the internal gas pressure of the gas injection valve. Fluctuations to achieve stable airflow, reliable work, and high response speed.

The technical scheme of the utility model: a straight-through piezoelectric type externally guided gas injection valve with mixed intake air, which is mainly composed of a valve body, a piezoelectric crystal, a fixed block, a large piston, a large piston support spring, a sealing ring, and a sleeve , return spring, ring disc, valve stem, small piston support spring, small piston, circlip, partition, valve core assembly, sealing rubber ring and valve seat. The fixed block is connected with the valve body by screw connection, so that it is fixed at the center above the valve body. The fixed block has a straight groove with a certain depth in the center, and the piezoelectric crystal is arranged in it. There is a groove above the straight groove. The through hole with a small diameter is used to arrange the connection wire between the piezoelectric crystal and the control unit outside the valve body. The lower surface of the piezoelectric crystal is in contact with the upper surface of the large piston. The lower surface is closely attached to the upper surface of the large piston. The upper end of the sleeve has multiple outlets, the central outlet is a thick outlet, and the surrounding outlets are thin outlets. They are symmetrically arranged below the ring disc. The lower end is a connected closed cavity. The lower end of the piston is arranged in the rough outlet in the center of the sleeve, and the large piston support spring is located between the flange of the large piston and the sleeve to ensure that the large piston will not enter the sleeve as a whole, and the sleeve is filled with hydraulic oil with a certain pressure , a small piston is arranged above the thin outlet at both ends of the sleeve, the lower end of the small piston is arranged in it, and a small piston support spring is arranged between the small piston flange and the sleeve to ensure that the small piston will not enter the sleeve as a whole, and the large A sealing ring is arranged between the piston, the side surface of the small piston and the inner wall of the sleeve to prevent the leakage of hydraulic oil in the sleeve. The large piston, small piston, large piston support spring, small piston support spring and the sleeve form a piezoelectric The hydraulic amplifier of the crystal, the hydraulic amplifier is arranged above the middle partition of the valve body as a whole, under the action of the pre-tightening force of the small piston support spring, the upper surface of the small piston is closely attached to the lower surface of the ring disc, and the return spring The two ends of the ring are respectively arranged in the groove on the fixed block and the ring disc. There are round holes at both ends of the ring disc, and there are threads in the hole. The ring disc and the valve stem are connected together by the thread, and the valve stem Arranged in the through hole in the partition, its lower end is fixed together with the upper end of the valve core assembly by a circlip, and there are vent holes with larger diameters at both ends of the partition, arranged in turn from top to bottom under the partition The valve core assembly, the valve seat, the valve seat and the valve body are fixedly connected together by bolts, and the mating surface between the two is sealed by a sealing rubber ring. The aforementioned valve core assembly is composed of an armature, a spring seat, and a bottom plate. , valve core, armature return spring, gasket and fastening bolts, the armature is connected with the bottom plate and the valve core through the fastening bolts, a layer of gasket is arranged between the armature and the bottom plate, there is a pressure balance hole on the armature, and the bottom plate There are four pressure balance grooves on the top, the pressure balance hole at the center of the armature cooperates with the pressure balance groove on the bottom plate to make the internal space of the valve core assembly communicate with the external space, the internal and external gas paths are balanced, and the internal and external gas of the valve core assembly has no pressure Poor, to avoid extra axial force when moving, the spring seat is installed above the bottom plate, and its inner side surface is in contact with the side surface of the armature, and the two ends of the armature return spring are respectively arranged between the partition plate and the spring seat On the annular groove, the spool is composed of the main body of the spool, ribs, and sealing rings, which are fixed on the four guide blocks on the valve seat in the circumferential direction to ensure its verticality. The movement lift of the spool passes through the spring seat and the diaphragm The distance between them is limited, the valve core assembly is arranged under the partition as a whole; the circumferential air supply hole is opened on the fin of the valve core and the diversion cone angle is set at the air supply hole, the valve core and the valve The sealing ring and the air outlet ring are used between the seats, the surface is sealed, the pressure is balanced, and it has a wide ring area. There are pressure stabilizing chambers at the center and periphery of the valve seat. The chamber communicates with the gas space inside the valve core assembly, and the pressure stabilizing chamber at the periphery of the valve seat communicates with the diversion chamber in the valve body. When the piezoelectric crystal is not energized, the lower surface of the valve core is in contact with the upper surface of the valve seat, and the ring cavity between the valve core and the valve seat is not connected; after the piezoelectric crystal is energized, the piezoelectric crystal elongates, and after being amplified by the hydraulic amplifier Drive the spool assembly to move upwards, and the lower surface of the spool is separated from the upper surface of the valve seat. At this time, the spool and the ring cavity between the valve seat are connected, and the lifting and seating of the spool control the on-off between the ring cavity.

Claims (3)

1. A piezo-electric externally guided gas injection valve with straight-through mixed air intake is characterized in that it includes a valve body, a valve seat, a valve stem, a piezoelectric crystal, a hydraulic amplifier, a partition, a valve core assembly, a valve The seat is fixed under the valve body and forms a valve space with the valve body. A fixed block is fixed above the inside of the valve body. There is a straight groove in the middle of the fixed block. The piezoelectric crystal is installed in the straight groove, and a partition is set in the middle of the valve body. A hydraulic amplifier is arranged above the partition, and a valve core assembly is arranged below the partition. The hydraulic amplifier includes a large piston, a small piston, and a sleeve. The sleeve is arranged on the partition. The upper end of the barrel is a thin outlet, the large piston is set in the coarse outlet, the small piston is arranged in the thin outlet, a large piston support spring is set between the flange of the large piston and the sleeve, and a large piston support spring is set between the flange of the small piston and the sleeve. A small piston supporting spring is arranged between the large piston and the sleeve below the small piston are filled with hydraulic oil, the upper surface of the large piston is bonded to the lower surface of the piezoelectric crystal, a ring disc is arranged outside the large piston, and the upper surface of the small piston is connected to the lower surface of the piezoelectric crystal. The lower surface of the ring disc is bonded, grooves are arranged in the ring disc and the fixed block, and the two ends of the return spring are respectively arranged in the grooves of the ring disc and the fixed block. The valve core assembly includes an armature, a spring The seat, base plate, valve core, armature, base plate, and valve core are arranged from top to bottom and connected together by fastening bolts. The spring seat is located outside the armature and forms an annular groove with the armature. The lower surface of the partition is provided with an annular groove. The two ends of the spring are respectively arranged in the annular groove of the diaphragm and the annular groove of the spring seat. A pressure balance hole is set at the center of the armature, a pressure balance groove is set on the bottom plate, the valve core is a hollow structure, and a center is set on the valve seat below the valve core The pressure stabilizing chamber, the pressure balance hole, the pressure balancing groove, the hollow part of the valve core and the central stabilizing chamber communicate with each other to form an internal space. The valve core is provided with a sealing ring and ribs, and the sealing ring forms a ring cavity. The air outlet ring belt and the guide block, the guide block is located around the valve core, the air outlet ring belt is located under the ring cavity, the air outlet is set under the air outlet ring belt, the through hole and the air hole are respectively set on the partition, the middle part of the valve stem passes through the through hole, The upper part of the valve stem is connected with the ring disc, and the lower part of the valve stem is fixed with the armature through a circlip. The upper surface of the valve core is provided with an axial main air groove. flow cone angle. 2. A straight-through piezoelectric gas injection valve with mixed intake air and external guidance according to claim 1, characterized in that: the outer end of the valve seat is provided with an end pressure stabilizing chamber. 3. According to claim 1 or 2, a piezo-electric externally guided gas injection valve with straight-through mixed intake air is characterized in that: an air inlet is formed between the upper part of the fixed block and the valve body, and the middle of the fixed block The air intake cavity is formed between the lower part and the hydraulic amplifier and the valve body, and the diversion cavity is formed between the valve core assembly and the valve body. The space communicates with the interior space; The gas flows vertically into the valve body through the air inlet, and flows vertically along the air inlet cavity until it flows through the vent hole, a part of the gas flows into the internal space of the valve core assembly and the pressure-stabilizing chamber in the center of the valve seat, and the rest of the gas continues along the guide cavity. Flow, filling the end pressure chamber at the outer end of the valve seat and the surrounding space of the valve core; When the piezoelectric crystal is not energized, the sealing ring on the valve core is closely matched with the upper surface of the valve seat, and the gas fills the external space and internal space inside the valve body of the gas injection valve; after the piezoelectric crystal is energized, the piezoelectric crystal receives current Excited to elongate, pushing the large piston to move downward, the hydraulic oil in the sleeve is compressed, under the action of hydraulic oil pressure, the small piston moves upward, and the valve stem also moves upward, and under the fixing action of the circlip, drives the valve The core assembly moves upward until the hydraulic oil pressure in the sleeve returns to the initial state, the small piston no longer moves, and the valve core assembly stops accordingly, and the gas is inhaled through the mixed axial main air groove and the circumferential air supply hole. After the piezoelectric crystal is powered off, the piezoelectric crystal shortens, and under the action of the large piston supporting spring, the large piston returns to the initial position, and the pressure of the hydraulic oil in the sleeve drops. Under the action of the return spring, the ring disc and the small piston move downward, and the valve stem and valve core assembly move downward accordingly until the pressure of the hydraulic oil in the sleeve returns to the initial state, and the large piston and small piston return to the initial position , the spool assembly returns to the initial position, the surface of the spool sticks to the surface of the valve seat, the gas injection valve is closed, and the gas path is closed.