CN206816408U - A kind of interior guiding fuel gas injection valve of bypass type axial admission - Google Patents

Abstract

The purpose of the utility model is to provide a bypass-type axial air intake inner-guided gas injection valve, which attracts the armature through the electromagnet, so that the valve core assembly moves away from the valve seat under the inner guidance of the guide pin. Realize the gas injection function of the gas valve; adopt the bypass gas supply method to guide the flow of gas in the valve body; apply a sealing ring at the bottom of the valve core to form an intake ring cavity, and the gas enters along the axial direction, on the one hand to avoid On the other hand, the quality of the valve seat is reduced; the valve seat structure with a pressure stabilizing chamber is adopted, which can effectively suppress the fluctuation of the gas pressure inside the gas injection valve and ensure the stability of the injection pressure of the gas injection valve; A pressure balance hole is set at the pin, and a pressure balance groove is set at the bottom plate to promote the balance of the internal and external air passages of the armature, ensuring that there is no gas pressure difference between the upper and lower sides of the armature, avoiding the extra axial force on the armature, and further improving the gas injection. The response speed of the valve.

Description

A bypass-type axial air-intake inner-guided 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 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, internal combustion engines using natural gas as fuel have 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, depending on the speed of the internal combustion engine, the response time of the gas injection valve is generally between several milliseconds to tens of milliseconds, that is, the gas injection valve must have the characteristics of fast response to meet the rapid At the same time, the gas injection valve also needs to have the largest gas outlet cross-sectional area to ensure sufficient gas supply for the internal combustion engine. 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 axial air intake inner guide gas injection valve with high response speed, high control precision and stable injection pressure.

The purpose of this utility model is achieved in that:

The utility model is a bypass-type axial air intake inner-guided gas injection valve, which is characterized in that it includes a valve body, a valve seat, an electromagnet and a valve core assembly, the electromagnet is installed on the valve body, and the valve body is installed on the On the valve seat, a valve space is formed between the electromagnet, the valve body and the valve seat. The coil is wound in the electromagnet. The valve core assembly is located in the valve space and is arranged below the electromagnet. The valve core assembly includes an armature, a spring Seat, bottom plate, valve core, guide pin, armature, bottom plate, 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, and an annular groove is arranged inside the electromagnet , the two ends of the main return spring are respectively arranged in the annular groove of the electromagnet and the annular groove of the spring seat, a guide pin is installed at the center of the armature, and the guide pin extends into the electromagnet, and an auxiliary return spring is arranged in the electromagnet, and the auxiliary return spring The two ends of the valve are in contact with the electromagnet and the guide pin respectively. 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, and a central pressure stabilizing chamber is set on the valve seat below the valve core. The pressure balance hole, pressure The balance groove, the hollow part of the valve core and the central pressure-stabilizing chamber communicate with each other to form an internal space. The valve core is provided with a sealing ring, which forms an air intake ring cavity, and the valve seat is provided with an air outlet ring, which is located at the inlet An air outlet is arranged below the ring chamber and below 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 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. Axial inlet holes are set on the spool;

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;

During the working process of the gas injection valve, when the coil is not energized, under the pretightening force of the main return spring and the auxiliary return spring, the sealing ring on the valve core is closely matched with the upper surface of the valve seat, and the gas is filled with gas. The external space and internal space inside the valve body; after the coil is energized, the armature is subjected to the upward electromagnetic force, and the valve core assembly moves upward after overcoming the pretightening force of the main return spring and the auxiliary return spring, and the valve core is separated from the seat surface , the gas injection valve is opened, the gas path is opened, the gas flows in from the axial inlet hole on the valve core, passes through the intake ring cavity, passes through the gap between the valve core and the valve seat, and finally flows out vertically after being guided by the gas outlet; the coil After the power is cut off, under the pretightening force of the main return spring and the auxiliary return spring, the armature moves downward, and the valve core assembly moves downward as a whole until the surface of the valve core fits with the surface of the valve seat and returns to the initial position. The gas injection valve is closed and the gas path is closed.

The advantage of the utility model is that: the method of attracting the armature through the electromagnet in the utility model makes the valve core assembly move away from the valve seat under the inner guiding action of the guide pin, and realizes the function of gas injection of the gas valve; the utility model adopts the side valve The gas supply method guides 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 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, the quality of the valve seat is reduced, and the response speed is improved; the utility model adopts a valve seat structure with a pressure stabilizing chamber, 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. Stability; the utility model is equipped with a pressure balance hole at the guide pin, and a pressure balance groove at the bottom plate, which promotes the balance of the internal and external gas paths of the armature, ensures that there is no gas pressure difference between the upper and lower sides of the armature, and avoids the additional axial pressure on the armature. The force further improves the response speed of the gas injection valve and reduces 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 the structural representation of the valve core assembly 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 with Figures 1-5, Figure 1 is a schematic diagram of the overall structure of a bypass-type axial air intake inner-guided gas injection valve of the present invention, including 1 electromagnet, 2 coils, 3 main return springs, 4 auxiliary return springs, 5 valve core assembly, 6 sealing rubber ring, 7 valve body, 8 valve seat, 9 positioning bolt, 10 sealing rubber ring and 12 sealing rubber ring. The electromagnet 1 uses the positioning bolt 9 to fix itself with the valve body 7, and a sealing rubber ring 10 is arranged on the mating surface of the electromagnet 1 and the valve body 7, thereby ensuring the tightness between the two; the valve body 7 It is a cuboid, with a gas inlet 25 and a diversion chamber 26 at one end near its center, and a through hole in the axial direction at the other end near the center of the valve body 7, which communicates with the diversion chamber 26 , the coil 2 is wound in the ring groove inside the electromagnet 1, and in the through-hole space of the valve body 7, the valve core assembly 5 and the valve seat 8 are arranged sequentially from top to bottom below the electromagnet 1, and the valve seat below 8 has a bolt hole 30, and the valve seat 8 below is fixedly connected with the valve body 7 above it by bolts, the upper surface of the valve seat 8 and the lower surface of the valve body 7, that is, the gap between the valve seat 8 and the valve body A sealing rubber ring 12 is arranged on the mating surface to ensure the tightness between the two. The valve seat 8 has a pressure stabilizing chamber 11 at its center and both ends close to the sealing ring 19. The pressure stabilizing chamber 11 at the center of the valve seat 8 The cavity 11 communicates with the gas space inside the valve core assembly 5 , and the pressure stabilizing cavity 11 at both ends of the valve seat 8 communicates with the through hole space in the valve body 7 .

As shown in Figure 2, a valve core assembly 5 of a bypass-type axial air intake internally guided gas injection valve consists of a guide pin 14, an armature 15, a spring seat 16, a bottom plate 17, a valve core 18, a retaining spring 21, The gasket 22 and the fastening bolt 24 are composed, the armature 15 is connected with the bottom plate 17 and the valve core 18 through the fastening bolt 24, a layer of gasket 22 is arranged between the armature 15 and the bottom plate 17, and there are four pressure valves above the bottom plate 17. The balance groove 23, the spring seat 16 is installed on the top of the base plate 17, and its inner side surface is in contact with the side surface of the armature 15, and the two ends of the main return spring 3 are respectively located in the annular grooves of the electromagnet 1 and the spring seat 16. There is a straight groove with a certain depth in the center of the iron 1. The guide pin 14 between the electromagnet 1 and the armature 15 is arranged inside the straight groove. An auxiliary return spring 4 is arranged above the guide pin 14 and between the electromagnet 1. The center of the guide pin 14 There is a pressure balance hole 20, which is arranged at the center of the armature 15. It is fixed with the armature 15 by a circlip 21. The spool 18 is composed of the spool body and the sealing ring 19. The spool assembly 5 is arranged on the electromagnetic Below the iron 1, initially the lower surface of the valve core assembly 5, that is, the lower surface of the valve core 18, is in close contact with the upper surface of the valve seat 8.

As shown in Figure 3, the gas is in a bypass-type axial air-intake inner-guided gas injection valve. First, the gas enters vertically from the air inlet 25 on the valve body 7, and after being guided by the guide cavity 26, the gas flows The direction is changed from the vertical direction to the horizontal direction, and flows into the space around the valve core assembly 5. Due to the existence of the pressure balance hole 20 on the guide pin 14 and the pressure balance groove 23 on the bottom plate 17, the internal space of the valve core assembly 5 and the valve body 7 The inner through hole space is connected, and a part of the gas will flow into the inner space of the valve core assembly 5, and then fill the straight groove space between the guide pin 14 and the electromagnet 1 in the valve core assembly 5, and the inner space of the valve core assembly 5. And the pressure stabilizing chamber 11 at the center of the valve seat 8; the rest of the gas flows into the top of the valve core 18, and a part of the gas flows in from the axial air inlet hole 27 on the valve core 18, and fills the air with a certain depth around the multi-channel sealing ring belt 19 Intake ring chamber 28, another part of gas is full of the pressure stabilizing chamber 11 at both ends of valve seat 8 and the surrounding space of valve core 18. When the coil 2 is not energized, the surface of the valve core 18 is in contact with the surface of the valve seat 8, and the inlet ring cavity 28 on the valve core 18 is not connected to the ring cavity near the gas outlet ring belt 13 on the valve seat 8; when the coil 2 is energized, The surface of the valve core 18 is separated from the surface of the valve seat 8. At this time, the intake ring cavity 28 is connected with the ring cavity near the gas outlet ring belt 13. The continuity between the ring cavity.

During the working process of the gas injection valve, when the coil 2 is not energized, under the pretightening force of the main return spring 3 and the auxiliary return spring 4, the spool assembly 5 remains stationary at the initial position, and the valve core assembly 5 The sealing ring 19 on the spool 18 closely fits with the upper surface of the valve seat 8. At this moment, the gas outlet ring 13 is not connected with the inner space of the valve body 7, and the gas is full of the whole space inside the valve body 7 of the gas injection valve. After the coil 2 is energized, the electromagnet 1 and the armature 15 are magnetized, and a closed magnetic circuit is formed between the electromagnet 1 and the armature 15. The armature 15 is subjected to the upward electromagnetic force, and the fastening bolt 24 holds the spool assembly 5 All the components including the armature 15 are fixed together, the spool assembly 5 is subjected to an upward force as a whole, moves upward after overcoming the pretightening force of the main return spring 3 and auxiliary return spring 4, and moves upward together The valve core 18 is separated from the surface of the valve seat 8. At this time, the gas injection valve is opened, the gas path is opened, and the gas flows in from the axial air inlet hole 27 on the valve core 18, and passes through the multi-channel sealing ring belt 19 with a certain depth. The air intake ring cavity 28 passes through the gap between the valve core 18 and the valve seat 8, and finally flows out vertically after being guided by the air outlet 29. The valve core 18 and the valve seat 8 adopt multi-channel ring belts, surface sealing, stable pressure and balance, Moreover, the wider annular area can reduce the impact and improve the reliability. The pressure stabilizing chamber 11 provided by the valve seat 8 near the two ends of the intake ring chamber 28 and the center of itself makes the surrounding gas ventilate evenly during the flow process, and the air pressure Balance; after a certain amount of gas is injected, the coil 2 is powered off, the electromagnetic force received by the armature 15 disappears, and the pretightening force of the main return spring 3 and the auxiliary return spring 4 between the electromagnet 1, the spring seat 16 and the guide pin 14 Under the action, the armature 15 moves downward, the valve core assembly 5 moves downward, and at the same time drives the valve core 18 to move downward until the surface of the valve core 18 fits with the surface of the valve seat 8, returns to the initial position, and the gas injection valve closes , the gas path is closed.

From the above working process, it can be known that a bypass-type axially-intake inner-guided gas injection valve of the utility model attracts the armature 15 by energizing the electromagnet 1, so that the valve core assembly 5 acts as the inner guide of the guide pin 14 The valve seat 8 moves downward to realize the function of gas injection of the gas valve; the utility model adopts a bypass gas supply mode to guide the flow of gas in the valve body 7; the bottom end of the valve core 18 uses a sealing ring 19 to form a The gas enters the gas inlet ring cavity 28 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 8 and improves the response speed; The structure of the valve seat 8 can effectively suppress the fluctuation of the gas pressure inside the gas injection valve and ensure the stability of the gas injection pressure of the gas injection valve; the utility model is provided with a pressure balance hole 20 at the guide pin 14 and a The pressure balance groove 23 is provided to promote the balance of the internal and external gas paths of the armature 15, ensuring that there is no gas pressure difference between the upper and lower sides of the armature 15, avoiding the extra axial force on the armature 15, further improving the response speed of the gas injection valve and reducing the gas pressure. Difficulty controlling the operation of the injection valve.

The utility model is a bypass-type axial air intake internally guided gas injection valve, comprising a valve body, an electromagnet, a positioning bolt, a sealing rubber ring, a coil, a main return spring, an auxiliary return spring, a valve core assembly, and a valve seat , the electromagnet uses positioning bolts to connect itself with the valve body, and a sealing rubber ring is arranged on the mating surface of the electromagnet and the valve body to ensure the tightness between the two; the valve body is a cuboid, close to One end of the center has a gas inlet and a diversion cavity, and a through hole is opened in the axial direction at the other end close to the center of the valve body. The through hole communicates with the diversion cavity, and the coil is wound in the ring groove inside the electromagnet. Inside, in the through-hole space of the valve body, the valve core assembly and the valve seat are arranged sequentially below the electromagnet from top to bottom. The surface and the lower surface of the valve body, that is, the mating surface between the valve seat and the valve body is arranged with a sealing rubber ring to ensure the sealing between the two. The valve seat is open at its center and at both ends near the sealing ring There is a pressure stabilizing chamber, the stabilizing chamber at the center of the valve seat communicates with the gas space inside the valve core assembly, and the stabilizing chamber at both ends of the valve seat communicates with the through hole space in the valve body; the aforementioned valve core assembly consists of Guide pin, armature, spring seat, gasket, bottom plate, retaining spring, fastening bolts and valve core. The armature is connected with the bottom plate and valve core through fastening bolts. A layer of gasket is arranged between the armature and the bottom plate. The bottom plate There are four pressure balance grooves on the top, the spring seat is installed above the bottom plate, and its inner side surface is in contact with the side surface of the armature. The two ends of the main return spring are respectively located in the annular grooves of the electromagnet and the spring seat. There is a straight groove with a certain depth in the center, and the guide pin between the electromagnet and the armature is arranged inside the straight groove. An auxiliary return spring is arranged above the guide pin and between the electromagnet. There is a pressure balance hole in the center of the guide pin, which is arranged on the armature. The center position of the valve core is fixed with the armature by a circlip. The valve core is composed of the valve core body and the sealing ring. The valve core assembly is arranged under the electromagnet. It fits closely with the upper surface of the valve seat; the gas enters vertically from the air inlet on the valve body, and after being guided by the guide cavity, the gas flow direction changes from vertical to horizontal, and flows into the space around the valve core assembly. With the existence of the pressure balance hole and the pressure balance groove on the bottom plate, the internal space of the valve core assembly is connected with the through hole space in the valve body, and part of the gas will flow into the internal space of the valve core assembly, and then fill the guide pins in the valve core assembly. The space between the straight groove and the electromagnet, the internal space of the valve core assembly, and the pressure stabilizing chamber at the center of the valve seat; the rest of the gas flows into the top of the valve core, and part of the gas flows in from the axial air inlet on the valve core, filling the The inlet ring cavity with a certain depth around the road sealing ring, and another part of the gas fills the pressure stabilizing cavity at both ends of the valve seat and the surrounding space of the valve core. When the coil 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 to the ring cavity near the outlet ring belt on the valve seat; after the coil is energized, the surface of the valve core is separated from the surface of the valve seat, At this time, the inlet ring chamber is connected with the ring chamber near the outlet ring belt, and the lifting and seating of the valve core control the on-off between the inlet ring chamber and the ring chamber near the outlet ring belt.

Claims (3)

1. a kind of interior guiding fuel gas injection valve of bypass type axial admission, it is characterized in that：Including valve body, valve seat, electromagnet, valve element Assembly, electromagnet are arranged on valve body, and valve body is arranged on valve seat, and valve space is formed between electromagnet, valve body and valve seat, Wound around coil in electromagnet, valve element assembly are located in valve space and are arranged on below electromagnet, described valve element assembly bag Armature, spring base, bottom plate, valve element, guide finger are included, armature, bottom plate, valve element are arranged while connected by fastening bolt from top to bottom Together, spring base is located at outside armature and annular groove is formed between armature, and annular groove, master reset bullet are set inside electromagnet The both ends of spring are arranged in the annular groove of electromagnet and the annular groove of spring base, and guide finger is installed at armature center, are oriented to Pin is stretched in electromagnet, auxiliary back-moving spring is set in electromagnet, the both ends of auxiliary back-moving spring contact electromagnet and guiding respectively Pin, pressure compensation opening is set in guide finger, relief groove is set on bottom plate, valve element is hollow structure, the valve seat below valve element Upper setting center pressure stabilizing cavity, pressure compensation opening, relief groove, the hollow space of valve element and center pressure stabilizing cavity are communicated and formed Inner space, seal band is set on valve element, and seal band forms air inlet ring cavity, outlet annulus, outlet annulus are set on valve seat Below air inlet ring cavity, gas outlet is set below outlet annulus.

2. a kind of interior guiding fuel gas injection valve of bypass type axial admission according to claim 1, it is characterized in that：Valve seat Outer end sets end pressure stabilizing cavity.

3. a kind of interior guiding fuel gas injection valve of bypass type axial admission according to claim 1 or 2, it is characterized in that：Valve Body sets extension, and extension sets air inlet, and diversion cavity, air inlet, diversion cavity are set in the valve body below air inlet Communicate and form exterior space, exterior space is communicated 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；

In the fuel gas injection valve course of work, when coil is not powered on, acted in the pretightning force of master reset spring and auxiliary back-moving spring Under, the upper surface of seal band and valve seat on valve element is fitted close, the outside of valve inner of the combustion gas full of fuel gas injection valve Space and inner space；After coil electricity, armature is acted on by upward electromagnetic force, and valve element assembly is overcoming master reset bullet Spring, auxiliary back-moving spring pretightning force after move upwards, valve element separates with valve base surface, fuel gas injection valve open, gas circuit open, combustion Gas is flowed into by the axial admission hole on valve element, passes through air inlet ring cavity, the space between valve element and valve seat, finally via outlet Mouth vertically flows out after being oriented to；After coil blackout, under the effect of the pretightning force of master reset spring and auxiliary back-moving spring, armature is transported downwards Dynamic, valve element assembly integrally moves downward, until spool face is bonded with valve base surface, comes back to initial position, gas injection Valve closing is penetrated, gas circuit is closed.