CN206816407U - Fuel gas injection valve is oriented in a kind of piezoelectric type of bypass type axial admission - Google Patents

Abstract

The purpose of this utility model is to provide a bypass-type axial air inlet piezoelectric type inner-guided gas injection valve, which utilizes piezoelectric crystals to be energized and elongated, and after the displacement is amplified by a hydraulic amplifier, the guide pin of the valve core assembly is pushed to move , the valve core assembly as a whole moves away from the valve seat under the inner guidance of the mating surface between the guide pin and the partition to realize the function of gas injection of the gas valve; the bypass gas supply method is adopted to control the flow of gas in the valve body Guiding; the bottom of the valve core uses a sealing ring to form an intake ring cavity, and the gas enters along the axial direction. On the one hand, it avoids gas interference and ensures the balance of the gas path. On the other hand, it reduces the quality of the valve seat and improves the response speed; The utility model adopts a valve seat structure with a pressure stabilizing chamber, which can effectively suppress the fluctuation of gas pressure inside the gas injection valve and ensure the stability of the gas injection pressure of the gas injection valve.

Description

A piezo-electric inner pilot gas injection valve with bypass type axial intake

technical field

The utility model 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 technique

With the rapid development of society, the demand for energy is increasing, and the problem of environmental pollution is also increasing. Natural gas has become the most promising energy source because of its abundant reserves, low price, and good economy and emissions. Internal combustion engines In the industry, using natural gas as the main fuel for the operation of internal combustion engines has a significant effect on reducing emissions. Therefore, the use of natural gas as the main fuel for internal combustion engines has become a research hotspot in the internal combustion engine industry in recent years. Gas injection valve is an important actuator in the gas supply system of gas fuel internal combustion engine, and its performance directly affects the characteristics of internal combustion engine. At present, in the actual working process of the gas injection valve, the response time of the gas injection valve is generally between a few milliseconds and tens of milliseconds according to the speed of the internal combustion engine, that is, the gas injection valve needs to have a high response speed to meet its requirements. At the same time, the gas injection valve also needs to have a gas outlet cross-sectional area as large as possible to ensure that the internal combustion engine can obtain sufficient gas volume. In addition, the flow state of the gas itself and the pressure of the injected gas when the gas injection valve is working Characteristics such as stability and control precision affect the performance of the internal combustion engine.

Contents of the invention

The purpose of the utility model is to provide a bypass-type piezoelectric inner-guided gas injection valve with axial air intake with variable lift, high response speed and stable injection pressure.

The purpose of this utility model is achieved in that:

The utility model discloses a bypass-type axial intake piezoelectric type inner-guided gas injection valve, which is characterized in that it includes a valve body, a valve seat, a piezoelectric crystal, a hydraulic amplifier, a partition, a valve core assembly, and a valve body. A fixed block is fixed above the body, a straight groove is opened in the middle of the fixed block, the piezoelectric crystal is installed in the straight groove, the valve body is fixed on the valve seat, a partition is set in the valve body, a hydraulic amplifier is set above the partition, and the valve core is combined The body is arranged under the partition, and through holes are respectively arranged on the partition. A valve space is formed between the valve body and the valve seat under the partition. The hydraulic amplifier includes a large piston, a small piston, and a sleeve, and the sleeve is arranged on the partition. On the board, the upper end of the sleeve is provided with a coarse outlet, and the inside of the upper end of the sleeve is provided with a fine outlet, the large piston is arranged in the coarse outlet, the small piston is arranged in the fine outlet, and the flange of the large piston is arranged between the sleeve and the sleeve. The large piston supports the spring, and the small piston supports the spring between the flange of the small piston and the sleeve. The sleeve below the large piston and the small piston is filled with hydraulic oil, and the guide pin passes through the through hole of the partition. Above the guide pin The control valve stem is set, and the guide pin return spring is arranged between the guide pin and the control valve stem. The upper surface of the control valve stem is bonded to the piezoelectric crystal, and the lower surface of the control valve stem is bonded to the upper surface of the large piston. The upper surface of the small piston is attached to the guide pin. The valve core assembly includes an armature, a spring seat, a bottom plate, and a valve core. The armature, the bottom plate, and the 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 diaphragm is provided with an annular groove. The two ends of the armature return spring are respectively arranged in the annular groove of the diaphragm and the annular groove of the spring seat. The guide pin is fixed to the armature. , a pressure balance hole is set in the guide pin, a pressure balance groove is set on the bottom plate, the valve core is a hollow structure, a central pressure stabilizing chamber is set on the valve seat below the valve core, the pressure balance hole, the pressure balance groove, the hollow part of the valve core and the center The pressure stabilizing chambers communicate with each other to form an internal space. A sealing ring is set on the valve core, which forms an inlet ring cavity. breath.

The utility model can also include:

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

2. The valve body is provided with a protruding part, and the protruding part is provided with an air inlet. The valve body below the air inlet is provided with a diversion chamber. The air inlet and the diversion chamber are connected to form an external space, and the external space communicates with the internal space. , the valve core is provided with an axial inlet hole;

The gas flows vertically into the guide chamber through the air inlet, part of the gas flows into the inner space and the central pressure-stabilizing chamber of the valve seat, the rest of the gas flows into the top of the valve core, and part of the gas flows through the axial air inlet hole to fill the air intake on the valve core. ring cavity, another part of the gas flows into the pressure stabilizing cavity at the outer end of the valve seat;

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 guide pin also moves upward, driving the valve core assembly to move upward, and the gas injection Open the valve and open the gas circuit until the pressure of the hydraulic oil in the sleeve returns to the initial state, the large piston and the small piston will no longer move, the valve core assembly will stop, and the gas will flow in through the axial air inlet hole on the valve core. Pass through the intake ring cavity, pass through the gap between the valve core and the valve seat, and finally flow out vertically after being guided by the air outlet; 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 When the initial position is reached, the pressure of the hydraulic oil in the sleeve drops. Under the action of the return spring of the guide pin, the guide pin moves downward, and the small piston and valve core assembly move downward accordingly until the pressure of the hydraulic oil in the sleeve returns to the initial state. 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 and the surface of the valve seat fit together, 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 guide pin of the valve core assembly is pushed to move. Under the action of the internal guidance of the valve seat, the gas valve can realize the gas injection function; 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 through different current drive modes of the piezoelectric crystal. The lift of the gas injection valve is variable; the utility model adopts a bypass gas supply method to guide the flow of gas in the valve body; the bottom of the valve core uses a sealing ring to form an intake ring cavity, and the gas flows along the axial direction On the one hand, it avoids gas interference and ensures the balance of the gas path. On the other hand, it reduces the quality of the valve seat and improves the response speed; The fluctuation of the gas pressure inside the valve ensures the stability of the gas injection pressure of the gas injection valve; the utility model is provided with a pressure balance hole at the guide pin and a pressure balance groove at the bottom plate to promote the balance of the internal and external gas paths of the valve core assembly , ensuring that there is no gas pressure difference between the top and bottom of the valve core assembly, avoiding the additional axial force on the valve core assembly, further improving the response speed of the gas injection valve, and reducing the difficulty of controlling the operation of the gas injection valve.

Description of drawings

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

Fig. 2 is an enlarged view of the valve core assembly structure of the present utility model;

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

Figure 4 is an enlarged view of the three-dimensional structure of the valve core;

Figure 5 is an enlarged view of the three-dimensional structure of the valve seat.

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 piezoelectric inner-guided gas injection valve with bypass type axial intake in the utility model, including 1 fixed block, 2 piezoelectric crystals, 3 valve body, 4 Control valve stem, 5 large pistons, 6 large piston support springs, 7 sealing rings, 8 sleeves, 9 sealing rubber rings, 10 sealing rubber rings, 12 positioning bolts, 13 sealing rubber rings, 14 guide pin return springs, 15 small pistons , 16 small piston support springs, 19 spool assemblies and 21 valve seats. The valve body 3 is a cuboid, with a gas inlet 33 and a diversion cavity 34 at one end near the center of the valve body 3, and a hole with a certain depth in the upper and lower axial directions at the other end near the center of the valve body 3, between the two holes There is a partition 18 with a certain depth, and the through hole under the partition 18 communicates with the diversion chamber 34. The fixed block 1 is connected with the valve body 3 by using the positioning bolt 12, so that it is fixed on the top of the partition 18. The center position of the top of the through hole is sealed by a sealing rubber ring 13 on the mating surface between the fixed block 1 and the valve body 3. The fixed block 1 has a straight groove with a certain depth in the center position, and the piezoelectric crystal 2 is arranged on the Among them, a through hole with a smaller diameter is opened above the straight groove, which is used to arrange the connection wires between the piezoelectric crystal 2 and the control unit outside the valve body 3, and the control valve stem 4 is closely arranged under the piezoelectric crystal 2, and the control valve stem 4 The lower surface of the piezoelectric crystal 2 is in contact with the upper surface of the large piston 5, and under the pretightening force of the guide pin return spring 14 and the large piston support spring 6, the lower surface of the piezoelectric crystal 2 and the upper surface of the control valve stem 4, and the lower surface of the control valve stem 4 The surface and the upper surface of the large piston 5 are closely fitted together. The upper end of the sleeve 8 is two outlets, one thick outlet and one thin outlet, and the lower end is a connected closed cavity. The lower end of the large piston 5 is arranged on the sleeve 8 In the coarse outlet of the large piston, the large piston support spring 6 is located between the flange of the large piston 5 and the sleeve 8 to ensure that the large piston 5 will not enter the sleeve 8 as a whole, and the sleeve 8 is filled with hydraulic oil 17 with a certain pressure. A small piston 15 is arranged above the thin outlet of the sleeve 8, and the lower end of the small piston 15 is arranged in it, and a small piston support spring 16 is arranged between the flange of the small piston 15 and the sleeve 8 to ensure that the small piston 15 will not enter as a whole. Inside the sleeve, a seal ring 7 is arranged between the side surfaces of the large piston 5, small piston 15 and the inner wall of the sleeve 8 to prevent leakage of the hydraulic oil 17 in the sleeve 8. The large piston 5, small piston 15, and large piston support spring 6. The small piston support spring 16 together with the sleeve 8 constitutes the hydraulic amplifier of the piezoelectric crystal 2. The hydraulic amplifier is arranged as a whole above the middle partition 18 of the valve body 3, and the center position of the control valve stem 4 is controlled from the top to the bottom. A valve core assembly 19 and a valve seat 21 are arranged sequentially from bottom to bottom. Under the pretightening force of the small piston support spring 16, the upper surface of the small piston 15 is closely attached to the upper end of the valve core assembly 19, and the valve seat 21 is opened. There are bolt holes 38, the valve seat 21 and the valve body 3 are fixedly connected together by bolts, the mating surface between the two is sealed by the sealing rubber ring 10, the valve seat 21 is at the center and near the sealing ring 27 There are pressure stabilizing chambers 11 at both ends, and the stabilizing chamber 11 at the center of the valve seat 21 communicates with the gas space inside the valve core assembly 19, while the stabilizing chambers 11 at both ends of the valve seat 21 communicate with the guide in the valve body 3. Flow cavity 33 is connected;

As shown in Figure 2, the spool assembly 19 of a piezo-electric inner-guided gas injection valve with bypass type axial intake is composed of a guide pin 22, an armature 23, a spring seat 24, a bottom plate 25, a spool 26, an armature Return spring 29, washer 30 and fastening bolt 32 are composed, in order to ensure the smooth movement of guide pin 22, a plurality of sleeves 8 are arranged below it, and corresponding plurality of small pistons 15 are arranged symmetrically under guide pin 22, each The number is an even number. Under the action of the small piston support spring 16, the upper surface of the small piston 15 is closely attached to the lower surface of the guide pin 22 in the valve core assembly 19. There is a pressure balance hole 28 in the center of the guide pin 22, which is arranged on the In the through hole in the center of the partition plate 18, the lower end of the guide pin 22 is fixed together with the armature 23 through threaded connection, the armature 23 is connected with the bottom plate 25 and the valve core 26 through the fastening bolt 32, and a Layer gasket 30, four pressure balance grooves 31 are opened above the base plate 25, the spring seat 24 is installed above the base plate 25, and its inner side surface is in contact with the side surface of the armature 23, and the two ends of the armature return spring 29 are respectively located In the annular groove of the partition plate 18 and the spring seat 24 , the spool 26 below the bottom plate 25 is composed of the spool main body and the sealing ring 27 , and the spool assembly 19 is integrally arranged below the control valve stem 4 .

As shown in Fig. 3, the gas enters a piezo-electric inner-guided gas injection valve with bypass type axial intake. , the gas flow direction is changed from the vertical direction to the horizontal direction, and flows into the space around the valve core assembly 19. Due to the existence of the pressure balance groove 31 on the bottom plate 25, the internal space of the valve core assembly 19 communicates with the internal space of the valve body 3, and a part of the gas It will flow into the internal space of the valve core assembly 19, and then fill the internal space of the valve core assembly 19 and the pressure stabilizing chamber 11 at the center of the valve seat 21. Due to the existence of the pressure balance hole 28 on the guide pin 22, the gas will flow into the valve core The space above the assembly 19 is also filled with the space above the spool assembly 19; the rest of the gas flows into the top of the spool 26, and a part of the gas flows in from the axial air inlet 35 on the spool 26, filling the air around the multi-channel sealing ring 27. There is an air intake ring chamber 36 with a certain depth, and another part of the gas fills the pressure stabilizing chamber 11 at both ends of the valve seat 21 and the surrounding space of the valve core 26 . When the piezoelectric crystal 2 is not energized, the surface of the valve core 26 is attached to the surface of the valve seat 21, and the inlet ring cavity 36 on the valve core 26 is not connected to the ring cavity near the gas outlet ring belt 20 on the valve seat 21; 2 After electrification, the piezoelectric crystal 2 elongates, and after being amplified by the hydraulic amplifier, the valve core assembly 19 is driven to move upward, and the surface of the valve core 26 is separated from the surface of the valve seat 21. The annular chambers are connected, and the lifting and seating of the valve core 26 controls the connection between the inlet annular chamber 36 and the annular chamber near the air outlet annular belt 20 .

During the working process of the gas injection valve, when the piezoelectric crystal 2 is not energized, under the pretightening force of the guide pin return spring 14 and the armature return spring 29, the spool assembly 19 remains stationary at the initial position, and the spool assembly 19 The sealing ring 27 on the spool 26 in the middle is closely matched with the upper surface of the valve seat 21, the inlet ring cavity 36 on the valve core 26 is not connected with the ring cavity near the gas outlet ring 20 on the valve seat 21, and the gas is full of gas The entire space inside the valve body 3 of the injection valve. After the piezoelectric crystal 2 is energized, the piezoelectric crystal 2 is excited by the current to elongate, so that the control valve stem 4 moves downward, and the large piston 5 moves downward accordingly, and the pressure of the hydraulic oil 17 in the sleeve 8 increases. Under the pressure of the oil 17, the small piston 15 moves upward, and the guide pin 22 moves upward steadily after receiving the upward force of several small pistons 15. The guide pin 22 is used as a part of the spool assembly 19, and the spool assembly 19 The whole body moves upward accordingly. At this time, the gas injection valve is opened, and the gas path is opened until the pressure of the hydraulic oil 17 in the sleeve 8 returns to the initial state. The large piston 5 and the small piston 15 stop moving, and the valve core assembly 19 follows. Stop the movement, and the valve core assembly 19 maintains this position for a period of time. During this process, the gas flows in from the axial air inlet hole 35 on the valve core 26, and passes through the intake ring cavity with a certain depth around the multi-channel sealing ring belt 27. 36, through the gap between the valve core 26 and the valve seat 21, and finally through the air outlet 37 to guide the vertical outflow, the valve core 26 and the valve seat 21 adopt multi-channel ring belt, surface sealing, stable pressure balance, and wide The area of the annular zone can reduce impact and improve reliability. The pressure stabilizing chamber 11 provided by the valve seat 21 near the two ends of the intake ring chamber 36 and the center of itself makes the surrounding gas ventilate evenly and balance the air pressure during the flow process; After a certain amount, the piezoelectric crystal 2 starts to be powered off, and the piezoelectric crystal 2 shortens. Under the action of the large piston support spring 6, the large piston 5 begins to move upward, the pressure of the hydraulic oil 17 in the sleeve 8 drops, and the guide pin resets Under the action of the spring 14, the guide pin 22 begins to move downward, and the small piston 15 and the valve core assembly 19 move downward together as a whole, until the pressure of the hydraulic oil 17 in the sleeve 8 returns to the initial state, and the large piston 5 and small The piston 15 returns to the initial position, and now the spool assembly 19 also returns to the initial position correspondingly, the surface of the spool 26 is attached to the surface of the valve seat 21, and returns to the initial position, the gas injection valve is closed, and the gas path is closed.

From the above working process, it can be seen that the utility model is a piezoelectric inner-guided gas injection valve with bypass type axial intake. Push the guide pin 22 of the valve core assembly 19 to move, and the valve core assembly 19 moves away from the valve seat 21 under the inner guidance of the mating surface between the guide pin 22 and the partition plate 18 to realize the function of gas valve injection; The new model adopts the driving method of piezoelectric crystal 2, which effectively improves the response speed of the gas injection valve. Through the different current driving methods of the piezoelectric crystal 2, the lift of the gas injection valve is variable; the utility model adopts a bypass power supply The air way guides the flow of gas in the valve body 3; the sealing ring 27 is applied to the bottom of the valve core 26 to form an intake ring cavity 36, and the gas enters along the axial direction. On the one hand, it avoids gas interference and ensures gas On the other hand, the quality of the valve seat 21 is reduced, and the response speed is improved; the utility model adopts the structure of the valve seat 21 with a pressure stabilizing chamber 11, which can effectively suppress the fluctuation of the internal gas pressure of the gas injection valve, ensuring The stability of the gas injection pressure of the gas injection valve; the utility model is provided with a pressure balance hole 28 at the guide pin 22, and a pressure balance groove 31 at the bottom plate 25, which promotes the balance of the internal and external gas paths of the valve core assembly 19, ensuring that the valve There is no gas pressure difference between the upper and lower sides of the core assembly 19, which avoids additional axial force on the valve core assembly 19, further improves the response speed of the gas injection valve, and reduces the difficulty of controlling the operation of the gas injection valve.

The utility model discloses a bypass-type axial intake piezoelectric type internally guided gas injection valve, which comprises a fixed block, a piezoelectric crystal, a valve body, a control valve rod, a large piston, a large piston support spring, a sealing ring, and a sleeve. , sealing rubber ring, positioning bolt, guide pin return spring, small piston, small piston support spring, valve core assembly and valve seat. The other end close to the center of the valve body has holes of a certain depth in the upper and lower directions in the axial direction. There is a partition of a certain depth between the two holes. The hole space under the partition is connected with the diversion chamber. The fixed block is positioned by Bolts connect it with the valve body so that it is fixed at the center of the top of the hole above the partition, and the sealing rubber ring is used on the mating surface between the fixed block and the valve body to keep the seal, and the fixed block is opened at the center. There is a straight groove with a certain depth, and the piezoelectric crystal is arranged in it. There is a through hole with a small diameter above the straight groove, which is used to arrange the connection wire between the piezoelectric crystal and the control unit outside the valve body. Valve stem, the lower surface of the control valve stem is in contact with the upper surface of the large piston. Under the pretightening force of the guide pin return spring and the large piston support spring, the lower surface of the piezoelectric crystal, the upper surface of the control valve stem, and the lower surface of the control valve stem The surface and the upper surface of the large piston are closely fitted together. The upper end of the sleeve is two outlets, one coarse outlet and one fine outlet, and the lower end is a connected closed cavity. The lower end of the large piston is arranged in the coarse outlet of the sleeve. , the large piston support spring is located between the large piston flange and the sleeve to ensure that the large piston will not enter the sleeve as a whole, the sleeve is filled with hydraulic oil with a certain pressure, and a small piston is arranged above the thin outlet of the sleeve. The lower end of the small piston is arranged in it, and a small piston support spring is arranged between the flange of the small piston and the sleeve to ensure that the small piston will not enter the sleeve as a whole. The side surface of the large piston, the small piston and the inner wall of the sleeve are arranged There is a sealing ring to prevent the leakage of hydraulic oil in the sleeve. The large piston, small piston, large piston support spring, small piston support spring and sleeve together constitute the hydraulic amplifier of the piezoelectric crystal. The hydraulic amplifier is arranged as a whole Above the partition plate in the valve body, below the center position of the control valve stem, there are a valve core assembly and a valve seat in sequence from top to bottom. The upper end of the body is tightly fitted, and there are bolt holes on the valve seat. The valve seat and the valve body are fixedly connected by bolts. The mating surface between the two is sealed by a sealing rubber ring. There are pressure stabilizing chambers at both ends close to the sealing ring, the stabilizing chamber at the center of the valve seat is connected with the gas space inside the valve core assembly, and the stabilizing chambers at both ends of the valve seat are connected with the diversion chamber in the valve body The aforementioned spool assembly is composed of guide pin, armature, armature return spring, spring seat, bottom plate, spool, gasket and fastening bolts. In order to ensure the smooth movement of the guide pin, there are multiple sets Corresponding multiple small pistons are symmetrically arranged under the guide pin, and the number is an even number. Under the action of the small piston support spring, the upper surface of the small piston is closely connected to the lower surface of the guide pin in the valve core assembly. There is a pressure balance hole in the center of the guide pin, which is arranged in the through hole in the center of the partition. The lower end of the guide pin is fixedly connected with the armature through threads, and the armature is connected with the bottom plate and valve core through fastening bolts. There is a layer of gaskets arranged between the bottom plates, four pressure balance grooves are opened above the bottom plate, 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 located on the partition plate In the annular groove with the spring seat, the valve core under the bottom plate is composed of the valve core body and the sealing ring belt. After guiding, the gas flow direction is changed from vertical direction to horizontal direction, and flows into the space around the valve core assembly. Due to the existence of the pressure balance groove on the bottom plate, the internal space of the valve core assembly is connected with the space inside the valve body, and part of the gas will flow into the valve core assembly. The internal space of the core assembly is filled with the internal space of the valve core assembly and the pressure stabilizing chamber at the center of the valve seat. Due to the existence of the pressure balance hole on the guide pin, the gas will flow into the space above the valve core assembly, which is also filled with the valve core assembly. The rest of the gas flows into the upper part of the valve core, part of the gas flows in from the air intake hole on the valve core, and fills the intake ring cavity with a certain depth around the multiple sealing rings, and the other part of the gas fills both ends of the valve seat The pressure stabilizing chamber at the place and the surrounding space of the spool. When the piezoelectric crystal is not energized, the surface of the valve core is in contact with the surface of the valve seat, and the inlet ring cavity on the valve core is not connected with the ring cavity near the outlet ring belt on the valve seat; Long, after being amplified by the hydraulic amplifier, the valve core assembly moves upwards, and the surface of the valve core is separated from the surface of the valve seat. The connection between the inlet ring chamber and the ring chamber near the outlet ring belt.

Claims (3)

1. fuel gas injection valve is oriented in a kind of piezoelectric type of bypass type axial admission, it is characterized in that：Including valve body, valve seat, piezoelectricity Crystal, fluid power amplifier, dividing plate, valve element assembly, valve body are fixedly arranged above fixed block, straight trough, piezoelectricity are provided with the middle part of fixed block Crystal is arranged in straight trough, and valve body is fixed on valve seat, and dividing plate is set in valve body, and fluid power amplifier is set above dividing plate, valve element Assembly is arranged on below dividing plate, sets through hole on dividing plate respectively, and valve space, institute are formed between the valve body and valve seat below dividing plate Stating fluid power amplifier includes big piston, valve piston, sleeve, and sleeve is arranged on dividing plate, and the end set of sleeve upper end slightly exports, Sleeve upper end tip inside sets thin outlet, and big piston is arranged in thick outlet, and valve piston is arranged in thin outlet, big piston Big piston support spring is set between flange and sleeve, valve piston support spring is set between the flange and sleeve of valve piston, greatly Filled with hydraulic oil in sleeve below piston, valve piston, guide finger passes through the through hole of dividing plate, and the top of guide finger sets control valve Bar, guide finger back-moving spring is set between guide finger and control valve rod, the upper surface and piezo-electric crystal for controlling valve rod are fitted in one Rise, the lower surface and big piston upper surface for controlling valve rod fit together, and valve piston upper surface fits together with guide finger, institute The valve element assembly stated includes armature, spring base, bottom plate, valve element, and armature, bottom plate, valve element are arranged while by tight from top to bottom Fixing bolt links together, and spring base is located at outside armature and annular groove is formed between armature, and dividing plate lower surface sets annular Groove, the both ends of armature back-moving spring are arranged in the annular groove of dividing plate and the annular groove of spring base, guide finger and armature phase It is fixed, pressure compensation opening is set in guide finger, relief groove is set on bottom plate, valve element is hollow structure, the valve below valve element Center pressure stabilizing cavity is set on seat, and pressure compensation opening, relief groove, the hollow space of valve element and center pressure stabilizing cavity communicate and structure Into inner space, seal band is set, seal band forms air inlet ring cavity, sets outlet annulus on valve seat, go out compression ring on valve element Band sets gas outlet below air inlet ring cavity below outlet annulus.

2. fuel gas injection valve is oriented in a kind of piezoelectric type of bypass type axial admission according to claim 1, it is characterized in that： The outer end of valve seat sets end pressure stabilizing cavity.

3. fuel gas injection valve, its feature are oriented in a kind of piezoelectric type of bypass type axial admission according to claim 1 or 2 It is：Extension is set on valve body, extension sets air inlet, sets diversion cavity in the valve body below air inlet, air inlet, Diversion cavity is communicated and forms exterior space, and exterior space communicates with inner space, and axial admission hole is set on valve element；

Combustion gas vertically flows into diversion cavity through air inlet, and a part of combustion gas is flowed into the center pressure stabilizing cavity of inner space and valve seat, Remaining combustion gas is flowed into above valve element, and a part of combustion gas stream is through axial air admission hole, full of the air inlet ring cavity on valve element, another part combustion Gas is flowed into the end pressure stabilizing cavity of valve seat outer end；

When piezo-electric crystal is not powered on, the upper surface of seal band and valve seat on valve element is fitted close, and combustion gas is full of fuel gas injection The exterior space of the valve inner of valve and inner space；Piezo-electric crystal be powered after, piezo-electric crystal by current excitation so as to extend, Big piston is promoted to move downward, the hydraulic oil in sleeve is compressed, and in the presence of hydraulic fluid pressure, valve piston is transported upwards Dynamic, guide finger is also moved upwards, and band movable valve plug assembly is moved upwards, and fuel gas injection valve is opened, and gas circuit is opened, until in sleeve Hydraulic fluid pressure return to original state, big piston and valve piston no longer move, and valve element assembly stops therewith, and combustion gas is by valve element On axial admission hole flow into, pass through air inlet ring cavity, the space between valve element and valve seat, after being finally oriented to via gas outlet Vertical outflow；After piezo-electric crystal power-off, piezo-electric crystal shortens, and in the presence of big piston support spring, big piston returns to initially Position, hydraulic fluid pressure declines in sleeve, and in the presence of guide finger back-moving spring, guide finger moves downward, valve piston, valve element Assembly moves downward therewith, until hydraulic fluid pressure returns to original state in sleeve, big piston, valve piston return to initial bit Put, valve element assembly returns to initial position, and spool face is bonded with valve base surface, and fuel gas injection valve is closed, and gas circuit is closed.