CN206816405U - A kind of combined electromagnetic piezoelectricity fuel gas injection valve - Google Patents

Abstract

The purpose of this utility model is to provide a combined electromagnetic piezoelectric gas injection valve. The electromagnetically driven valve core assembly and the piezoelectrically driven valve core assembly share a valve body and valve seat. Two different methods independently control the movement of the corresponding spool assembly, which can quickly realize the switching of gas injection when the single spool or double spool is lifted, and use the characteristics of the piezoelectric crystal to ensure that the gas injection valve is accurate to the fuel injection. The control accuracy of the quantity, the electromagnetic drive and the piezoelectric drive together ensure the large gas injection quantity of the gas injection valve, and meet the different requirements of the internal combustion engine for the gas injection quantity at different powers; the valve seat structure with a pressure stabilizing chamber is adopted , 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 Combined Electromagnetic Piezoelectric Gas Injection Valve

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 development of society, natural gas, as one of the new clean energy sources, has become the most promising energy source due to its abundant reserves, low price, and clean combustion, and has attracted widespread attention. In the internal combustion engine industry, using clean energy such as natural gas as the main fuel of internal combustion engines is gradually being practically applied, and internal combustion engines using natural gas and other gaseous fuels as the main fuel have become a research hotspot in the industry. As an important executive component in the gas supply system of the internal combustion engine, the gas injection valve has a significant impact on the performance of the internal combustion engine. At present, during the working process of the internal combustion engine under full working conditions, the power range of a single cylinder is wide, and the gas injection valve suitable for large flow rate is not high in the control accuracy of small flow gas injection, which does not meet the control of gas injection of the internal combustion engine at part load. Accuracy requirements, the gas injection valve suitable for small flow rate does not meet the requirements of internal combustion engine for large gas flow injection under high power working conditions, and only a single gas injection valve is used to match the internal combustion engine, which cannot meet the power requirements of the internal combustion engine under different working conditions. Depending on the speed of the internal combustion engine, the response time of the gas injection valve is generally between a few milliseconds and tens of milliseconds, that is, the gas injection valve must have the characteristics of fast response to meet the requirements of its rapid switch. In addition, the gas injection pressure when the gas injection valve is working The stability of the gas flow and the size of the cross-sectional area of the gas outlet will affect the working characteristics of the internal combustion engine.

Contents of the invention

The purpose of the utility model is to provide a combined electromagnetic piezoelectric gas injection valve that matches the power range of the full working condition of the internal combustion engine, the flow rate is variable, and the gas injection pressure is stable.

The purpose of this utility model is achieved in that:

The utility model is a combined electromagnetic piezoelectric gas injection valve, which is characterized in that it includes a valve body, a valve seat, a baffle, a solenoid valve part and a piezoelectric part, the valve seat is fixed under the valve body, and a baffle is set in the middle of the valve body , a first through hole and a second through hole are arranged on the partition;

The solenoid valve part includes an electromagnet and a first valve core assembly. The electromagnet is located in the valve body above the partition and is fixed to the upper end of the valve body. A coil is wound in the electromagnet. The first valve core assembly is located in the valve body below the partition. In the valve body, the first valve core assembly includes the first armature, the first spring seat, the first bottom plate, the first valve core, the first guide pin, the first armature, the first bottom plate, and the first valve core from top to bottom The layout is connected together by fastening bolts at the same time. The first spring seat is located outside the first armature and forms an annular groove with the first armature. An annular groove is arranged inside the electromagnet. The two ends of the main return spring of the electromagnet are respectively arranged on the electromagnet In the annular groove of the first spring seat and the annular groove of the first spring seat, the first guide pin is installed at the center of the first armature, and the first guide pin extends into the electromagnet through the first through hole of the partition plate, and the electromagnet is arranged in the electromagnet Auxiliary return spring, the two ends of the electromagnet auxiliary return spring respectively contact the electromagnet and the first guide pin, the first pressure balance hole is set in the first guide pin, the first pressure balance groove is set on the first bottom plate, and the first valve core is Hollow structure, the first central pressure stabilizing chamber is set on the valve seat below the first valve core, the first pressure balance hole, the first pressure balance groove, the hollow part of the first valve core and the first central pressure stabilizing chamber are connected, the first The valve core is provided with a first sealing ring, the first sealing ring forms the first ring cavity, the first axial main air groove is set on the upper surface of the first valve core, the circumferential air supply hole is opened on the first rib, and the second The first diversion cone angle is set at the air supplement hole;

The piezoelectric part includes a fixed block, a piezoelectric crystal, a control valve stem, a hydraulic amplifier, and a second valve core assembly. The fixed block is fixed on the inner upper end of the valve body, and a straight groove is opened in the middle of the fixed block, and the piezoelectric crystal is installed. In the straight groove, the hydraulic amplifier is arranged above the partition, and the second 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 provided with a coarse outlet, the inner side 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 a large piston support spring is arranged between the flange of the large piston and the sleeve , a small piston support spring is set 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, the second guide pin passes through the second through hole of the partition, and the second guide pin The control valve stem is set above the second guide pin and the control valve stem, and the guide pin return spring is set between the second guide pin and the control valve stem. The upper surface of the control valve stem is attached to the piezoelectric crystal, and the lower surface of the control valve stem is attached to the upper surface of the large piston. Together, the upper surface of the small piston is attached to the second guide pin, and the second valve core assembly includes a second armature, a second spring seat, a second bottom plate, a second valve core, a second armature, and a second bottom plate . The second valve core is arranged from top to bottom and connected together by fastening bolts. The second spring seat is located outside the second armature and forms an annular groove with the second armature. The lower surface of the partition is provided with an annular groove. The second armature The 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, the second guide pin is fixed with the second armature, the second pressure balance hole is set in the second guide pin, and the second pressure balance hole is set on the second bottom plate. Two pressure balance grooves, the second valve core is a hollow structure, the second central pressure stabilizing chamber is set on the valve seat below the second valve core, the second pressure balance hole, the second pressure balance groove, the hollow part of the second valve core and The second central pressure stabilizing chamber is connected, the second valve core is provided with a second sealing ring and a second fin, the second sealing ring forms a second ring cavity, and the upper surface of the second valve core is provided with a second axial main air groove , a second circumferential air supply hole is opened on the second fin, and a second diversion cone angle is set at the second air supply hole;

An air outlet ring is arranged on the valve seat, the air outlet ring is located under the first ring chamber and the second ring chamber, and an air outlet is arranged under the air outlet ring.

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 below the partition is provided with a bypass air inlet, and the part of the valve body connected with the bypass air inlet is a diversion chamber, and the gas enters through the bypass inlet, and flows into the valve body along the diversion chamber , a part of which flows into the internal space of the first valve core assembly and the second valve core assembly through the first pressure balance tank and the second pressure balance tank, filling the first pressure stabilization chamber, the second pressure stabilization chamber, and the end pressure stabilization chamber. cavity, and flow to the space above the first valve core assembly and the second valve core assembly, and another part of the gas is supplied by the first axial main air groove, the second axial main air groove, the first air supply hole, and the second air supply The mixed air intake of the air hole flows in, filling the first ring cavity, the second ring cavity and the end pressure stabilization cavity of the valve seat;

When the solenoid valve part works alone, when the coil is not energized, under the pretightening force of the electromagnet main return spring and the electromagnet auxiliary return spring, the sealing ring on the first valve core is closely matched with the upper surface of the valve seat. Gas fills the inside of the valve body; after the coil is energized, the first armature is subjected to upward electromagnetic force, and the first valve core assembly moves upward after overcoming the pretightening force of the main return spring of the electromagnet and the auxiliary return spring of the electromagnet. The core is separated from the surface of the valve seat, the gas injection valve is opened, and the gas path is opened. The gas flows in through the mixed intake mode of the first axial main air groove and the first circumferential air supply hole, passes through the first annular cavity, and finally passes through the gas outlet vertically. Outflow; after the coil is de-energized, under the action of the pre-tightening force of the main return spring of the electromagnet and the auxiliary return spring of the electromagnet, the first armature moves downward, and the first spool assembly moves downward as a whole until the surface of the first spool Fit with the surface of the valve seat, return to the initial position, the gas injection valve is closed, and the gas path is closed;

When the piezoelectric part works alone, when the piezoelectric crystal is not energized, the second sealing ring on the second valve core fits closely with the upper surface of the valve seat, and the gas fills the inside of the gas valve body; after the piezoelectric crystal is energized, the piezoelectric crystal Excited by the current to elongate, push 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 second guide pin also moves upward, bringing the second movable spool The combination moves upwards, the gas injection valve opens, and the gas path opens until the pressure of the hydraulic oil in the sleeve returns to the initial state, the large piston and the small piston no longer move, the second valve core assembly stops accordingly, and the gas is released from the second The mixed air intake from the axial main air groove and the second circumferential air supply hole flows in, passes through the second ring cavity, and finally flows out vertically from the air outlet; Under the action, the large piston returns to the initial position, the hydraulic oil pressure in the sleeve drops, and under the action of the guide pin return spring, the second guide pin moves downward, and the small piston and the second valve core assembly move downward accordingly. Until the hydraulic oil pressure in the sleeve returns to the initial state, the large piston and the small piston return to the initial position, the second valve core assembly returns to the initial position, the surface of the second valve core is attached to the surface of the valve seat, and the gas injection valve is closed. Airway closed;

When the solenoid valve part and the piezoelectric part work together, their respective actions are the same as when they work alone.

The advantage of the utility model is that: the electromagnetically driven spool assembly and the piezoelectrically driven spool assembly of the utility model share a valve body and valve seat, and adopt two different modes of electromagnetic and piezoelectric actuation to control them independently. The movement of the corresponding spool assembly can quickly realize the switching of gas injection when the single spool or double spool is lifted. The characteristics of the piezoelectric crystal are used to ensure the control accuracy of the fuel injection quantity of the gas injection valve. The electromagnetic drive cooperates with the pressure The electric drive works together to ensure the large gas injection volume requirements of the gas injection valve, and to meet the different requirements for the gas injection volume of the internal combustion engine at different powers; 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 ensures the stability of the gas injection pressure of the gas injection valve.

Description of drawings

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

Fig. 2a is a partial side view of the solenoid valve, and Fig. 2b is a side view of the piezoelectric part;

Fig. 3 is the enlarged structural view of the first spool assembly;

Fig. 4 is the enlarged structure diagram of the second spool assembly;

Figure 5a is a side view of the air path of the solenoid valve, Figure 5b is a side view of the air path of the piezoelectric part, and Figure 5c is a diagram of the overall air path inside the valve body;

Fig. 6 is the enlarged view of the three-dimensional structure of the spool;

Fig. 7 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:

Combined with Figures 1-7, Figure 1 is a schematic diagram of the overall structure of a combined electromagnetic piezoelectric gas injection valve of the present invention, and Figure 2 is a side view of a combined electromagnetic piezoelectric gas injection valve, including 1 valve body, 2 Electromagnet, 3 coil, 4 auxiliary return spring of electromagnet, 5 main return spring of electromagnet, 7 first valve core assembly, 8 sealing rubber ring, 10 fixed block, 11 piezoelectric crystal, 12 control valve stem, 13 guide pin Return spring, 14 large pistons, 15 large piston support springs, 16 small piston support springs, 17 small pistons, 18 sealing rings, 19 sleeves, 21 second spool assemblies and 23 valve seats. The electromagnet 2 and the fixed block 10 are connected together with the valve body 1 through threads, so that the electromagnet 2 is fixed at the center of the left half of the valve body 1, and the fixed block 10 is fixed at the center of the right half of the valve body 1. In the left half of 1, the coil 3 is wound in the ring groove inside the electromagnet 2, the first valve core assembly 7 is arranged under the electromagnet 2, and the first valve core assembly 7 is arranged between the electromagnet 2 and the first valve core assembly 7. The main return spring 5 of the electromagnet and the auxiliary return spring 4 of the electromagnet. Initially, the lower surface of the first valve core assembly 7 is closely attached to the upper surface of the left half of the valve seat 23, and the valve seat 23 below has a bolt hole 58. The upper surface of the valve seat 23 and the lower surface of the valve body 1, that is, the mating surface between the valve seat 23 and the valve body 1 is arranged with a sealing rubber ring 8 to ensure that the valve body 1 above it is fixedly connected by bolts. The tightness between them, the valve seat 23 has a pressure stabilizing chamber 9 at the lower end of the center position of the first spool assembly 7 and at both ends of the first sealing ring 30 near the first spool 28, the first spool The pressure stabilizing chamber 9 at the lower end of the central position of the assembly 7 communicates with the gas space inside the first valve core assembly 7 , and the pressure stabilizing chamber 9 at both ends of the first sealing ring 30 near the first valve core 28 communicates with the valve The inner space of the valve body 1 is connected; in the right half of the valve body 1, the fixed block 10 has a straight groove with a certain depth in the center, and the piezoelectric crystal 11 is arranged in it, and a small diameter hole is opened above the straight groove. The holes are used for arranging the connection wires between the piezoelectric crystal 11 and the control unit outside the valve body 1. The control valve stem 12 is closely arranged under the piezoelectric crystal 11. The lower surface of the control valve stem 12 is in contact with the upper surface of the large piston 14. Under the pretightening force of the guide pin return spring 13 and the large piston support spring 15, the lower surface of the piezoelectric crystal 11 and the upper surface of the control valve stem 12, and the lower surface of the control valve stem 12 and the upper surface of the large piston 14 are closely bonded together , the upper end of the sleeve 19 is two outlets, one thick outlet and one thin outlet respectively, and the lower end is a connected closed chamber, the lower end of the large piston 14 is arranged in the coarse outlet of the sleeve 19, and the large piston support spring 15 is located in the large piston 14 Between the flange and the sleeve 19, ensure that the large piston 14 will not enter the sleeve 19 as a whole, the sleeve 19 is filled with hydraulic oil 20 with a certain pressure, and the small piston 17 is arranged above the thin outlet of the sleeve 19, The lower end of the small piston 17 is arranged therein, and a small piston supporting spring 16 is arranged between the flange of the small piston 17 and the sleeve 19 to ensure that the small piston 17 will not enter the sleeve 19 as a whole, and the side of the large piston 14 and the small piston 17 A sealing ring 18 is arranged between the surface and the inner wall of the sleeve 19 to prevent the leakage of the hydraulic oil 20 in the sleeve 19. The large piston 14, the small piston 17, the large piston support spring 15, and the small piston support spring 16 together with the sleeve 19 The hydraulic amplifier of the piezoelectric crystal 11 is formed, and the hydraulic amplifier is arranged above the partition plate 6 in the valve body 1 as a whole, and the second valve core assembly 21 is arranged sequentially from top to bottom below the center position of the control valve stem 12 , the valve seat 23, under the pretightening force of the small piston support spring 16, the upper surface of the small piston 17 and the second valve core assembly 2 The upper end of 1 is closely attached. Initially, the lower surface of the second valve core assembly 21 is closely attached to the upper surface of the right half of the valve seat 23. The valve seat 23 is below the center position of the second valve core assembly 21 and close to the second Both ends of the second sealing ring 43 of the valve core 41 are provided with a pressure stabilizing chamber 9, and the pressure stabilizing chamber 9 below the center of the second valve core assembly 21 is connected to the gas space inside the second valve core assembly 21 The pressure stabilizing chamber 9 at both ends of the second sealing ring 43 communicates with the internal space of the valve body 1 .

As shown in Figure 3, the aforesaid first spool assembly 7 is composed of the first guide pin 24, the first armature 25, the first spring seat 26, the first bottom plate 27, the first spool 28, the snap ring 32, the first The gasket 33 and the first fastening bolt 35 are composed. The first armature 25 is connected with the first bottom plate 27 and the first valve core 28 through the first fastening bolt 35. The first armature 25 is arranged between the first bottom plate 27. There is a layer of first gasket 33, four pressure balance grooves 34 are opened above the first base plate 27, and the first spring seat 26 is installed above the first base plate 27, and its inner side surface is consistent with the side surface of the first armature 25. contact, the two ends of the main return spring 5 of the electromagnet are respectively located in the annular groove of the electromagnet 2 and the first spring seat 26, the center of the electromagnet 2 has a straight groove of a certain depth, and the space between the electromagnet 2 and the first armature 25 The first guide pin 24 is arranged inside the straight groove, the electromagnet auxiliary return spring 4 is arranged between the top of the first guide pin 24 and the electromagnet 2, and the first guide pin 24 center has a first pressure balance hole 31, which is arranged at the second The center position of an armature 25 is fixed with the first armature 25 by a snap spring 32, and the first rib 29 of the first valve core 28 opens a circumferential first air supply hole 54 and is set at the first air supply hole 54. The first diversion cone angle 36, the first valve core 28 is provided with a first sealing ring 30, the first valve core assembly 7 is arranged below the electromagnet 2 as a whole, the lower surface of the first valve core assembly 7 is initially The lower surface of the first valve core 28 is in close contact with the upper surface of the valve seat 23 .

As shown in Figure 4, the aforementioned second spool assembly 21 is composed of a second guide pin 37, a second armature 38, a second spring seat 39, a second bottom plate 40, a second spool 41, and a second armature return spring 45. , the second gasket 46 and the second fastening bolt 48, in order to ensure the smooth movement of the second guide pin 37, a plurality of small pistons 17 are symmetrically arranged under the second guide pin 37, and the corresponding plurality of hydraulic amplifiers are arranged in the Below the second guide pin 37, the symmetrical number is an even number. Under the action of the small piston support spring 16, the upper surface of the small piston 17 is closely attached to the lower surface of the second guide pin 37 in the second valve core assembly 21, The center of the second guide pin 37 has a second pressure balance hole 44, which is arranged in the through hole in the center of the partition plate 6. The lower end of the second guide pin 37 is fixed with the second armature 38 through threaded connection, and the second armature 38 passes through the second armature. The two fastening bolts 48 are connected with the second bottom plate 40 and the second valve core 41. A layer of second gasket 46 is arranged between the second armature 38 and the second bottom plate 40. There are four first bottom plates above the second bottom plate 40. Two pressure balance grooves 47, the second spring seat 39 is installed on the top of the second bottom plate 40, and its inner side surface is in contact with the side surface of the second armature 38, and the two ends of the second armature return spring 45 are respectively located on the partition plate 6 In the annular groove of the second spring seat 39, the second fin 42 of the second valve core 41 under the second bottom plate 40 has a circumferential second air supply hole 56 and a second flow guide is set at the second air supply hole 56. The cone angle 49 , the second valve core 41 is provided with a second sealing ring 43 , and the second valve core assembly 21 is integrally arranged under the control valve stem 12 .

As shown in Figure 5, in a combined electromagnetic piezoelectric gas injection valve, the gas first enters from the bypass inlet 50 on the valve body 1, flows into the valve body 1 along the guide cavity 51, and part of it passes through The first pressure balance groove 34 and the second pressure balance groove 47 flow into the inner space of the first valve core assembly 7 and the second valve core assembly 21, filling the center of the first valve core assembly 7 and the second valve core assembly 21. Due to the existence of the first pressure balance hole 31 and the second pressure balance hole 44 in the pressure stabilizing chamber 9 at the lower end, this part of the gas will also flow to the space above the first valve core assembly 7 and the second valve core assembly 21 , the inner space of the first valve core assembly 7 and the second valve core assembly 21 communicates with the outside to prevent them from being subjected to additional axial force. The other part of the gas flows in quickly through the mixed air intake mode of the axial main air groove 57 and the first air supply hole 54 and the second air supply hole 56, filling multiple channels of the first annular cavity 53, the second annular cavity 55 and the valve seat 23 close to the first annular cavity. A sealing ring 30 and the stabilizing chamber 9 at the two ends of the second sealing ring 43, the first valve core 28, the second valve core 41 and the valve seat 23 are closely matched at the beginning, the first ring chamber 53, the second ring chamber The cavity 55 is not connected to the ring cavity near the gas outlet ring 22, and the lifting and seating of the first valve core 28 and the second valve core 41 control the first ring cavity 53, the second ring cavity 55 and the ring cavity near the gas outlet ring 22. between breaks.

The first valve core assembly 7 driven by the electromagnet 2 and the second valve core assembly 21 driven by the piezoelectric crystal 11 respectively control the gas injection process. Taking the electromagnet 2 and the piezoelectric crystal 11 working at the same time as an example, the gas injection valve works In the process, when the coil 3 on the electromagnet 2 and the piezoelectric crystal 11 are not energized, the pretension of the electromagnet main return spring 5, the electromagnet auxiliary return spring 4, the guide pin return spring 13, and the second armature return spring 45 Under the action of force, the first valve core assembly 7 and the second valve core assembly 21 remain in the initial position, and the first sealing ring 30 and the first valve core assembly 7 on the first valve core 28 in the first valve core assembly 7 The lower surface of the second sealing ring 43 of the second valve core 41 in the two valve core assembly 21 is closely attached to the upper surface of the air outlet ring 22 of the valve seat 23. At this time, the first ring cavity 53, the second ring The cavity 55 is not yet communicated with the annular cavity near the gas outlet annular zone 22, and the gas fills the entire space inside the valve body 1 of the gas injection valve. After the coil 3 and the piezoelectric crystal 11 in the electromagnet 2 are energized, a magnetic circuit is formed between the electromagnet 2 and the first armature 25, the electromagnet 2 and the first armature 25 are magnetized, and the first armature 25 is subjected to electromagnetic force to overcome the electromagnet. The pre-tightening force of the main return spring 5 and the electromagnet auxiliary return spring 4 moves upward, the piezoelectric crystal 11 is excited by the current to elongate, and pushes the control valve stem 12. After the displacement is amplified by the hydraulic amplifier, the second guide pin 37 is moved symmetrically. The upward thrust of a plurality of arranged small pistons 17, under the effect of overcoming the pretightening force of the guide pin return spring 13 and the second armature return spring 45, moves upward smoothly, and the upward movement of the first armature 25 and the second guide pin 37 Drive the first spool assembly 7 and the second spool assembly 21 to move upward respectively, the first spool 28 and the second spool 41 move upward and separate from the surface of the valve seat 23 until the upper surface of the first spring seat 26 is in contact with the spacer. During the whole movement process, the axial movement and circumferential positioning of the first armature 25 are realized by the mating surface between the first guide pin 24 and the electromagnet 2, until the plate contacts and the piezoelectric crystal is no longer elongated. The axial movement and circumferential positioning of the guide pin 37 are both realized by the mating surface between the second guide pin 37 and the separator 6. At this time, the gas path is opened, the gas injection valve is opened, and the gas is quickly released from the axial main gas groove 57. and the first air supply hole 54, the second air supply hole 56 in the mixed intake mode, through the multiple first ring chambers 53 and second ring chambers 55, the pressure stabilizing chamber 9 on the valve seat 23 inhibits the gas pressure during the flow process Finally, the gas flows out vertically from the gas outlet 52; after a certain amount of gas is ejected, the coil 3 and the piezoelectric crystal 11 in the electromagnet 2 start to be powered off, the first armature 25 disappears under the electromagnetic force, and the electromagnet resets Under the pretightening force of the spring 5 and the electromagnet auxiliary reset spring 4, the first armature 25 moves downward, driving the first spool assembly 7 to move downward, the piezoelectric crystal 11 loses current excitation and begins to shorten, and the second guide pin 37 starts to move downward under the action of the pretightening force of the guide pin return spring 13 and the second armature return spring 45, driving the second valve core assembly 21 to move downward until the first valve core assembly 7 in the first valve core assembly 7 The valve core 28, the lower surface of the second valve core 41 in the second valve core assembly 21 and the upper surface of the valve seat 23 are attached to each other, each component in the gas injection valve returns to the initial position, the gas circuit is closed, and the gas injection valve is closed. .

It can be seen from the above working process that the utility model is a combined electromagnetic piezoelectric gas injection valve. The first valve core assembly 7 driven by the electromagnet 2 and the second valve core assembly 21 driven by the piezoelectric crystal 11 share a valve body. 1 and valve seat 23, adopt two different methods of electromagnetic and piezoelectric drive to independently control the movement of the corresponding valve core assembly, which can quickly realize the switching of gas injection when the single valve core or double valve core is lifted. The characteristics of the piezoelectric crystal 11 ensure the control accuracy of the fuel injection volume of the gas injection valve. The electromagnetic drive and the piezoelectric drive work together to ensure the large gas injection volume of the gas injection valve and meet the requirements of the gas injection volume of the internal combustion engine at different powers. different requirements; the utility model adopts a valve seat 23 structure with a pressure stabilizing chamber 9, which can effectively suppress the fluctuation of the internal gas pressure of the gas injection valve and ensure the stability of the gas injection pressure of the gas injection valve.

The utility model is a combined electromagnetic piezoelectric gas injection valve, comprising a valve body, an electromagnet, a coil, an electromagnet main return spring, an electromagnet auxiliary return spring, a first valve core assembly, a sealing rubber ring, a fixed block, a pressing Transistor, control valve stem, guide pin return spring, large piston, large piston support spring, small piston support spring, small piston, sealing ring, sleeve, second valve core assembly and valve seat, electromagnet, fixed block It is connected with the valve body through threads, so that the electromagnet is fixed at the center of the left half of the valve body, and the fixed block is fixed at the center of the right half of the valve body. In the left half of the valve body, the coil is wound inside the electromagnet. In the ring groove, the first spool assembly is arranged under the electromagnet, and the electromagnet main return spring and the electromagnet auxiliary return spring are arranged between the electromagnet and the first spool assembly. Initially, the first spool assembly The lower surface is closely attached to the upper surface of the left half of the valve seat. The lower valve seat has a bolt hole, which is fixedly connected with the valve body above it by bolts. The upper surface of the valve seat and the lower surface of the valve body, that is, the valve A sealing rubber ring is arranged on the mating surface between the seat and the valve body to ensure the tightness between the two. There are pressure stabilizing chambers at both ends, the stabilizing chamber at the lower end of the center of the first valve core assembly communicates with the gas space inside the first valve core assembly, and the two ends near the sealing ring of the first valve core The pressure stabilizing chamber communicates with the inner space of the valve body; in the right half of 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, and a smaller diameter groove is opened above the straight groove. The through hole is used to arrange the connection wires between the piezoelectric crystal and the control unit outside the valve body. The control valve stem is closely arranged under the piezoelectric crystal. The lower surface of the control valve stem is in contact with the upper surface of the large piston. Under the action of the pre-tightening force of the piston supporting spring, the lower surface of the piezoelectric crystal and the upper surface of the control valve stem, the lower surface of the control valve stem and the upper surface of the large piston are all closely fitted together. The upper end of the sleeve is two outlets, one thick The outlet and a thin outlet, the lower end is a connected closed cavity, the lower end of the large piston is arranged in the thick outlet of the sleeve, and the supporting spring of the large piston 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 Inside the cylinder, the sleeve is filled with hydraulic oil with a certain pressure. A small piston is arranged above the thin outlet of the sleeve, and the lower end of the small piston is arranged in it. A small piston support spring is arranged between the flange of the small piston and the sleeve. In order to ensure that the small piston will not enter the sleeve as a whole, a sealing ring is arranged between the side surface of the large piston, small piston and the inner wall of the sleeve to prevent leakage of hydraulic oil in the sleeve. The large piston, small piston, and large piston support the spring , The small piston support spring and the sleeve together constitute the hydraulic amplifier of the piezoelectric crystal. The hydraulic amplifier is arranged above the middle partition of the valve body as a whole, and there are second The spool assembly and the valve seat, under the action of the pre-tightening force of the small piston support spring, the upper surface of the small piston is in close contact with the upper end of the second spool assembly, and initially the lower surface of the second spool assembly is on the right side of the valve seat. Half Part of the upper surface is tightly fitted, and the valve seat is provided with a pressure-stabilizing chamber below the center of the second valve core assembly and at both ends of the second sealing ring near the second valve core. The center of the second valve core assembly The pressure stabilizing chamber at the lower position communicates with the gas space inside the second valve core assembly, while the pressure stabilizing chamber at both ends of the second sealing ring communicates with the internal space of the valve body; the aforementioned first valve core assembly consists of The first guide pin, the first armature, the first spring seat, the first bottom plate, the first valve core, the circlip, the first gasket, and the first fastening bolt are composed of the first armature and the first fastening bolt through the first fastening bolt. The bottom plate and the first valve core are connected together, a layer of first gasket is arranged between the first armature and the first bottom plate, four pressure balance grooves are opened above the first bottom plate, and the first spring seat is installed above the first bottom plate , the inner side surface is in contact with the side surface of the first armature, the two ends of the main return spring of the electromagnet are respectively located in the annular grooves of the electromagnet and the first spring seat, and there is a straight groove with a certain depth in the center of the electromagnet. The first guide pin between the iron and the first armature is arranged inside the straight groove, an electromagnet auxiliary return spring is arranged above the first guide pin and between the electromagnet, and a first pressure balance hole is opened in the center of the first guide pin. At the center position of the first armature, it is fixed with the first armature by a circlip, and the first rib of the first valve core is opened with a first air supply hole in the circumferential direction and a first diversion cone angle is set at the first air supply hole. , the first valve core is provided with a first sealing ring, and the first valve core assembly is arranged under the electromagnet as a whole. Initially, the lower surface of the first valve core assembly, that is, the lower surface of the first valve core is closely connected to the upper surface of the valve seat. fit; the aforementioned second spool assembly consists of the second guide pin, the second armature, the second spring seat, the second bottom plate, the second spool, the second armature return spring, the second gasket and the second fastening Bolts, in order to ensure the smooth movement of the second guide pin, a plurality of small pistons are symmetrically arranged under the second guide pin, and a plurality of corresponding hydraulic amplifiers are arranged under the second guide pin, and the symmetrical number is an even number. Under the action of the piston supporting spring, the upper surface of the small piston is in close contact with the lower surface of the second guide pin in the second valve core assembly. There is a second pressure balance hole in the center of the second guide pin. In the hole, the lower end of the second guide pin is fixed with the second armature through threaded connection, and the second armature is connected with the second bottom plate and the second valve core through the second fastening bolts. A layer of second gasket is arranged, four second pressure balance grooves are opened above the second bottom plate, the second spring seat is installed above the second bottom plate, and its inner side surface is in contact with the side surface of the second armature. The two ends of the return spring of the second armature are respectively located in the annular groove of the partition plate and the second spring seat, and the second rib of the second valve core under the second bottom plate is opened with a second air supply hole in the circumferential direction and is set at the second air supply hole. The second diversion cone angle, the second valve core is provided with a second sealing ring, and the second valve core assembly is arranged under the control valve stem as a whole; the gas enters from the bypass inlet on the valve body, The flow cavity flows into the valve body, and part of it flows into the first valve core assembly and the second valve core through the first pressure balance groove and the second pressure balance groove The internal space of the combination is filled with the pressure stabilizing chamber at the lower end of the center of the first and second valve core combination. Due to the existence of the first pressure balance hole and the second pressure balance hole, this part of the gas will also flow to the first valve core The space above the assembly and the second spool assembly, the internal spaces of the first spool assembly and the second spool assembly are in communication with the outside, so as to prevent them from being subjected to additional axial force. The other part of the gas quickly flows in from the axial main air groove and the mixed air intake of the first air supply hole and the second air supply hole, filling multiple channels of the first annular cavity, the second annular cavity and the valve seat close to the first sealing ring and the second sealing ring. The pressure-stabilizing chamber at both ends of the second seal ring, the first valve core, the second valve core and the valve seat are closely matched at the beginning, the first ring chamber, the second ring chamber and the ring chamber near the gas outlet ring are not connected, the first Lifting and seating of the spool and the second spool control the on-off between the first annular cavity, the second annular cavity and the annular cavity near the gas outlet annular zone.

Claims (3)

1. A combined electromagnetic piezoelectric gas injection valve is characterized in that it includes a valve body, a valve seat, a partition, a solenoid valve part, and a piezoelectric part, the valve seat is fixed below the valve body, and a partition is arranged in the middle of the valve body. A first through hole and a second through hole are arranged on the partition; The solenoid valve part includes an electromagnet and a first valve core assembly. The electromagnet is located in the valve body above the partition and is fixed to the upper end of the valve body. A coil is wound in the electromagnet. The first valve core assembly is located in the valve body below the partition. In the valve body, the first valve core assembly includes the first armature, the first spring seat, the first bottom plate, the first valve core, the first guide pin, the first armature, the first bottom plate, and the first valve core from top to bottom The layout is connected together by fastening bolts at the same time. The first spring seat is located outside the first armature and forms an annular groove with the first armature. An annular groove is arranged inside the electromagnet. The two ends of the main return spring of the electromagnet are respectively arranged on the electromagnet In the annular groove of the first spring seat and the annular groove of the first spring seat, the first guide pin is installed at the center of the first armature, and the first guide pin extends into the electromagnet through the first through hole of the partition plate, and the electromagnet is arranged in the electromagnet Auxiliary return spring, the two ends of the electromagnet auxiliary return spring respectively contact the electromagnet and the first guide pin, the first pressure balance hole is set in the first guide pin, the first pressure balance groove is set on the first bottom plate, and the first valve core is Hollow structure, the first central pressure stabilizing chamber is set on the valve seat below the first valve core, the first pressure balance hole, the first pressure balance groove, the hollow part of the first valve core and the first central pressure stabilizing chamber are connected, the first The valve core is provided with a first sealing ring, the first sealing ring forms the first ring cavity, the first axial main air groove is set on the upper surface of the first valve core, the circumferential air supply hole is opened on the first rib, and the second The first diversion cone angle is set at the air supplement hole; The piezoelectric part includes a fixed block, a piezoelectric crystal, a control valve stem, a hydraulic amplifier, and a second valve core assembly. The fixed block is fixed on the inner upper end of the valve body, and a straight groove is opened in the middle of the fixed block, and the piezoelectric crystal is installed. In the straight groove, the hydraulic amplifier is arranged above the partition, and the second 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 provided with a coarse outlet, the inner side 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 a large piston support spring is arranged between the flange of the large piston and the sleeve , a small piston support spring is set 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, the second guide pin passes through the second through hole of the partition, and the second guide pin The control valve stem is set above the second guide pin and the control valve stem, and the guide pin return spring is set between the second guide pin and the control valve stem. The upper surface of the control valve stem is attached to the piezoelectric crystal, and the lower surface of the control valve stem is attached to the upper surface of the large piston. Together, the upper surface of the small piston is attached to the second guide pin, and the second valve core assembly includes a second armature, a second spring seat, a second bottom plate, a second valve core, a second armature, and a second bottom plate . The second valve core is arranged from top to bottom and connected together by fastening bolts. The second spring seat is located outside the second armature and forms an annular groove with the second armature. The lower surface of the partition is provided with an annular groove. The second armature The 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, the second guide pin is fixed with the second armature, the second pressure balance hole is set in the second guide pin, and the second pressure balance hole is set on the second bottom plate. Two pressure balance grooves, the second valve core is a hollow structure, the second central pressure stabilizing chamber is set on the valve seat below the second valve core, the second pressure balance hole, the second pressure balance groove, the hollow part of the second valve core and The second central pressure stabilizing chamber is connected, the second valve core is provided with a second sealing ring and a second fin, the second sealing ring forms a second ring cavity, and the upper surface of the second valve core is provided with a second axial main air groove , a second circumferential air supply hole is opened on the second fin, and a second diversion cone angle is set at the second air supply hole; An air outlet ring is arranged on the valve seat, the air outlet ring is located under the first ring chamber and the second ring chamber, and an air outlet is arranged under the air outlet ring. 2. A combined electromagnetic piezoelectric gas injection valve according to claim 1, characterized in that: the outer end of the valve seat is provided with an end pressure stabilizing chamber. 3. A combined electromagnetic piezoelectric gas injection valve according to claim 1 or 2, characterized in that: the valve body below the partition is provided with a bypass air inlet, and the valve body connected to the bypass air inlet Part of it is a diversion chamber, the gas enters from the bypass inlet, flows into the valve body along the diversion chamber, and part of it flows into the first valve core assembly and the second valve body through the first pressure balance groove and the second pressure balance groove. The internal space of the spool assembly is filled with the first plenum chamber, the second plenum chamber, and the end plenum chamber, and flows to the space above the first spool assembly and the second spool assembly. The first axial main air groove, the second axial main air groove, the first air supply hole, and the second air supply hole mixed intake air flow in, filling the first ring cavity, the second ring cavity and the end of the valve seat to stabilize the pressure Cavity; When the solenoid valve part works alone, when the coil is not energized, under the pretightening force of the electromagnet main return spring and the electromagnet auxiliary return spring, the sealing ring on the first valve core is closely matched with the upper surface of the valve seat. Gas fills the inside of the valve body; after the coil is energized, the first armature is subjected to upward electromagnetic force, and the first valve core assembly moves upward after overcoming the pretightening force of the main return spring of the electromagnet and the auxiliary return spring of the electromagnet. The core is separated from the surface of the valve seat, the gas injection valve is opened, and the gas path is opened. The gas flows in through the mixed intake mode of the first axial main air groove and the first circumferential air supply hole, passes through the first annular cavity, and finally passes through the gas outlet vertically. Outflow; after the coil is de-energized, under the action of the pre-tightening force of the main return spring of the electromagnet and the auxiliary return spring of the electromagnet, the first armature moves downward, and the first spool assembly moves downward as a whole until the surface of the first spool Fit with the surface of the valve seat, return to the initial position, the gas injection valve is closed, and the gas path is closed; When the piezoelectric part works alone, when the piezoelectric crystal is not energized, the second sealing ring on the second valve core fits closely with the upper surface of the valve seat, and the gas fills the inside of the gas valve body; after the piezoelectric crystal is energized, the piezoelectric crystal Excited by the current to elongate, push 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 second guide pin also moves upward, bringing the second movable spool The combination moves upwards, the gas injection valve opens, and the gas path opens until the pressure of the hydraulic oil in the sleeve returns to the initial state, the large piston and the small piston no longer move, the second valve core assembly stops accordingly, and the gas is released from the second The mixed air intake from the axial main air groove and the second circumferential air supply hole flows in, passes through the second ring cavity, and finally flows out vertically from the air outlet; Under the action, the large piston returns to the initial position, the hydraulic oil pressure in the sleeve drops, and under the action of the guide pin return spring, the second guide pin moves downward, and the small piston and the second valve core assembly move downward accordingly. Until the hydraulic oil pressure in the sleeve returns to the initial state, the large piston and the small piston return to the initial position, the second valve core assembly returns to the initial position, the surface of the second valve core is attached to the surface of the valve seat, and the gas injection valve is closed. Airway closed; When the solenoid valve part and the piezoelectric part work together, their respective actions are the same as when they work alone.