CN206903773U - A kind of interior guiding fuel gas injection valve of bypass type mixed admission - Google Patents

Abstract

The purpose of the utility model is to provide a bypass-type internally guided gas injection valve for mixed intake air, which realizes the process of intake air and flow diversion through the bypass structure and the diversion cavity structure; realizes the control of the valve core through the control of the actuator, The control of the gas circuit realizes the function of gas valve injection; through the cooperation of the inner guide structure with the pressure balance hole, pressure balance groove and pressure stabilizing chamber, the verticality of the valve core is ensured, and the stable and reliable operation of the air flow is realized to achieve high response Speed; through the mixed air intake method of direct air intake from the axial main air groove and air intake from the circumferential air supply holes, a large flow rate can be achieved, which can effectively improve the air supply efficiency of the engine, and at the same time avoid air flow interference and achieve the stability of the air path; through The multi-channel ring structure between the valve core and the valve seat realizes the surface sealing of the gas injection valve and has high reliability.

Description

A bypass-type mixed-intake inner-guided gas injection valve

technical field

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

Background technique

In recent years, with the rapid growth of my country's oil consumption, oil is heavily dependent on imports. Natural gas burns cleanly and has abundant reserves in my country, making it the most likely fuel to replace diesel. In the internal combustion engine industry, energy saving and emission reduction is an inevitable trend in the development of internal combustion engines. Internal combustion engines using natural gas as the main fuel can greatly reduce emission pollution under the premise of ensuring power performance. research hotspots. As a fuel supply device for a natural gas engine, the performance of the gas injection valve directly determines the characteristics of the natural gas engine. At present, in the actual working process of the gas injection valve, the 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 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 stability and control accuracy of the gas pressure injected by the gas injection valve when the gas injection valve is working, etc. Each characteristic affects the performance of the internal combustion engine. Therefore, the development of large-flow gas injection valves with fast response speed, stable air pressure, high control precision and high reliability is the current development trend of gas injection valves for natural gas engines.

Contents of the invention

The purpose of the utility model is to provide a bypass-type internally guided gas injection valve with mixed intake air with fast response speed, high control precision, high reliability, stable air pressure, high-efficiency sealing and large flow rate.

The purpose of this utility model is achieved in that:

The utility model is a bypass-type internally guided gas injection valve for mixed intake air, 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 valve body. On the seat, a valve space is formed between the electromagnet, the valve body and the valve seat, and 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. An auxiliary return spring is arranged in the electromagnet. The two ends 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 and pressure balance The groove, the hollow part of the valve core and the central pressure stabilizing chamber are connected to form an internal space. The valve core is provided with a sealing ring, which forms a ring cavity. The valve seat is provided with an air outlet ring, which is located under the ring cavity. An air outlet is set under the ring belt, an axial main air groove is set on the upper surface of the valve core, and a circumferential air supply hole is opened on the rib, and a diversion cone angle is set at the air supply hole.

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 gas flows vertically into the diversion chamber through the air inlet, and flows into the outer space and inner space filled with the valve body along the diversion chamber, part of which flows into the central pressure stabilization chamber through the pressure balance hole, and the end pressure stabilization chamber and diversion chamber Connected;

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 through the mixed intake mode of the axial main gas groove and the circumferential air supply hole, passes through the ring cavity, and finally flows out vertically from the gas outlet; after the coil is powered off, the main return spring and the Under the pretightening force of the auxiliary return spring, the armature moves downward, and the valve core assembly moves downward until the surface of the valve core fits 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 utility model has the advantages that: the utility model realizes the air intake and flow diversion process through the bypass structure and the diversion chamber structure; realizes the control of the valve core and the control of the gas circuit through the control of the actuator, and realizes the function of gas injection of the gas valve; Through the cooperation of the inner guide structure with the pressure balance hole, pressure balance groove and pressure stabilizing chamber, the verticality of the valve core can be ensured, which can effectively suppress the fluctuation of gas pressure inside the gas injection valve, realize the stable and reliable operation of the gas flow, and achieve high response Speed; through the mixed air intake method of direct air intake from the axial main air groove and air intake from the circumferential air supply hole, a large flow rate can be achieved, the air supply efficiency of the engine can be effectively improved, and air flow interference can be avoided at the same time, and the stability of the air path can be achieved; through The multi-channel ring structure between the valve core and the valve seat realizes the surface sealing of the gas injection valve and has high reliability.

Description of drawings

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

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

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

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

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

detailed description

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

Combining with Figures 1-5, Figure 1 is a schematic diagram of the overall structure of the inner-guided gas injection valve of the bypass type mixed intake air of the present invention, including 1 electromagnet, 2 coils, 3 main return springs, 4 auxiliary return springs, and 5 spools Combined body, 7 bodies and 8 seats. The electromagnet 1 is fixed on the valve body 7 through the fixing bolt 9, the coil 2 is wound in the ring groove inside the electromagnet 1, and the valve core assembly 5, the valve seat 8 are arranged in sequence from top to bottom under the electromagnet 1, and the valve The seat 8 and the valve body 7 are fixedly connected together by bolts, and the mating surface between the two is sealed by a sealing rubber ring 12 .

As shown in Figure 2, a valve core assembly 5 of a bypass-type mixed air-intake inner-guided gas injection valve is mainly composed of a guide pin 13, a retaining spring 21, an armature 14, a spring seat 15, a fastening bolt 24, and a washer 22. The bottom plate 16 and the valve core 17 are composed. The armature 14 is connected with the bottom plate 16 and the valve core 17 through fastening bolts 24. A layer of gasket 22 is arranged between the armature 14 and the bottom plate 16. The spring seat 15 is installed on the bottom of the bottom plate 16. Above, its internal side surface is in contact with the side surface of the armature 14. The two ends of the main return spring 3 are respectively located in the annular grooves of the electromagnet 1 and the spring seat 15. The center of the electromagnet 1 has a straight groove of a certain depth. The guide pin 13 between the iron 1 and the armature 14 is arranged inside the straight groove. There is a pressure balance hole 20 in the center of the guide pin 13, and a certain number of pressure balance grooves 23 are opened on the bottom plate 16 to prevent the armature 14 from being subjected to axial force, so that The internal and external gas path pressure at the armature 14 is easier to achieve balance, and the response speed of the armature 14 is improved. An auxiliary return spring 4 is arranged between the top of the guide pin 13 and the electromagnet 1, which is arranged at the center of the armature 14, and the guide pin 13 is moved by the circlip 21. Fix it with the armature 14. The pressure balance hole 20 at the center of the guide pin 13 cooperates with the pressure balance groove 23 on the bottom plate 16 to make the internal space of the valve core assembly 5 communicate with the external space, the internal and external gas paths are balanced, and there is no pressure difference between the internal and external gas of the valve core assembly 5. To prevent itself from being subjected to additional axial force during movement, the spool 17 is composed of a spool body, ribs 18 and sealing rings 19 . The spool assembly 5 is integrally arranged under the electromagnet 1 .

As shown in Figure 3, firstly, the gas flows vertically into the valve body 7 from the air inlet 26, flows into the valve body 7 along the guide cavity 27, and part of it flows into the valve seat 8 through the pressure balance hole 20 at the guide pin 13. In the pressure stabilizing chamber 29 at the center, the stabilizing chamber 29 at the center of the valve seat 8 communicates with the gas space inside the valve core assembly 5, while the stabilizing chamber 29 at the periphery of the valve seat 8 communicates with the flow guide in the valve body 7 Cavities 27 communicate with each other.

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 lower surface of the sealing ring 19 of the valve core 17 is closely attached to the upper surface of the gas outlet ring 11 of the valve seat 8. At this time, the annular cavity 30 between the valve core 17 and the valve seat 8 is not yet connected, and the gas is filled with the gas injection valve. The whole space inside the valve body 7. After the coil 2 is energized, the electromagnet 1 and the armature 14 are magnetized, and a magnetic circuit is formed between the electromagnet 1 and the armature 14. The armature 14 is subjected to the action of the electromagnetic force and overcomes the pretightening force of the main return spring 3 and the auxiliary return spring 4 and then moves upward. , drive the valve core 17 to move upward and separate from the surface of the valve seat 8 until the upper surface of the spring seat 15 contacts the lower surface of the electromagnet 1. During the whole movement process, the axial movement and circumferential positioning of the armature 14 are controlled by the guide pin 13 and the electromagnet 1 are controlled and realized. At this time, the gas circuit is opened, the solenoid valve is opened, and the gas quickly flows in from the mixed air intake mode of the axial main air groove 32 and the circumferential air supply hole 28, and passes through the multi-channel ring. cavity 30, and finally flow out vertically from the air outlet 31; the coil 2 is powered off, the electromagnetic force received by the armature 14 disappears, and the main return spring 3 between the electromagnet 1 and the spring seat 15 and the guide pin 13 and the electromagnet 1 Under the action of the auxiliary return spring 4, the armature 14 moves downward, driving the valve core 17 to move downward until the surface of the valve core 17 and the surface of the valve seat 8 fit together, the armature 14 returns to the initial position, the air circuit is closed, and the solenoid valve is closed.

It can be seen from the above working process that a bypass-type internally guided gas injection valve for mixed intake air of the utility model realizes the intake and flow diversion process through the bypass structure and the diversion cavity 27 structure; the valve core 17 is realized through the control of the actuator. The control of the air circuit realizes the air injection function; the verticality of the valve core 17 is guaranteed through the inner guide structure; the pressure balance hole 20 is opened in the center of the guide pin 13 and a certain number of pressure balance grooves 23 are opened on the bottom plate 16, Prevent the armature 14 from being subjected to axial force, make it easier to balance the pressure of the internal and external air passages at the armature 14, and improve the response speed of the armature 14; on the fin 18 of the valve core 17, a plurality of circumferential air holes 28 are opened, and the valve core 17 is lowered. There are multiple annular cavities 30 on the surface and the upper surface of the valve seat 8 to increase the effective flow area, reduce the quality of the valve core 17 and the valve seat 8, and improve reliability; a certain angle guide is set at the valve core 17 circumferentially to the air supply hole 28. The flow cone angle is 25, which reduces the flow loss and increases the flow coefficient; the utility model adopts the mixed air intake mode of the direct air intake of the axial main air groove 32 and the air intake of the circumferential air supply hole 28, which increases the air intake flow coefficient and realizes a large flow rate , which effectively improves the gas supply efficiency of the gas injection valve, and at the same time avoids air flow interference, and realizes the balance and stability of the gas path; the valve core 17 and the valve seat 8 adopt a multi-channel sealing ring 19 and an air outlet ring 11 structure to realize The surface of the gas injection valve is sealed, the pressure is balanced, and the wide ring area can reduce the impact and improve the reliability; the pressure stabilizing chamber 29 is set at the center and the periphery of the valve seat 8, which can effectively suppress the internal gas pressure of the gas injection valve The fluctuation can make the ventilation uniform, realize the stable work of the airflow, work reliably, and realize high response speed.

The technical solution of the utility model: a bypass-type internally guided gas injection valve with mixed intake air, which is mainly composed of an electromagnet, a coil, a main return spring, an auxiliary return spring, a valve core assembly, a valve body and a valve seat. The electromagnet is fixed on the valve body through fixing bolts, the coil is wound in the ring groove inside the electromagnet, and the valve core assembly and the valve seat are arranged in sequence from top to bottom under the electromagnet, and the valve seat and the valve body are connected by bolts. They are fixedly connected together, and the mating surface between the two is sealed by a sealing rubber ring; the valve core assembly is composed of a guide pin, an armature, a spring seat, a gasket, a bottom plate, a retaining spring, a fastening bolt and a valve core. The feature is: the armature is connected with the bottom plate and the valve core through fastening bolts, a layer of gasket is arranged between the armature and 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. The two ends of the return spring are respectively located in the annular groove of the electromagnet and the spring seat. There is a straight groove with a certain depth in the center of the electromagnet. The guide pin between the electromagnet and the armature is arranged inside the straight groove. The center of the guide pin is provided with a pressure balance. There are a certain number of pressure balance grooves on the bottom plate, and an auxiliary return spring is arranged between the guide pin and the electromagnet, which is arranged at the center of the armature, and the guide pin and the armature are fixed by a circlip. Composed of the main body, ribs and sealing ring belt, the valve core assembly is arranged under the electromagnet as a whole, the circumferential air supply hole is opened on the rib of the valve core and the diversion cone angle is set at the air supply hole, between the valve core and the valve seat It adopts the structure of sealing ring and air outlet ring, surface sealing, stable pressure balance, and has a wide ring area. There are pressure stabilizing chambers at the center and periphery of the valve seat. The pressure stabilizing chamber at the center of the valve seat and The gas space inside the valve core assembly is connected, and the pressure stabilizing chamber at the periphery of the valve seat is connected with the diversion chamber in the valve body.

Claims (3)

1. A bypass-type internally guided gas injection valve with mixed intake air, 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 valve seat Above, a valve space is formed between the electromagnet, the valve body and the valve seat, a coil is wound in the electromagnet, and the valve core assembly is located in the valve space and arranged under 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. The two ends of the 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. An auxiliary return spring is arranged in the electromagnet. The ends contact the electromagnet and the guide pin respectively, the guide pin is provided with a pressure balance hole, the bottom plate is provided with a pressure balance groove, the valve core is a hollow structure, and the valve seat below the valve core is provided with a central pressure stabilizing chamber, a pressure balance hole, and a pressure balance groove. 1. The hollow part of the valve core and the central pressure-stabilizing chamber are connected to form an internal space. The valve core is provided with a sealing ring, which forms a ring cavity. The valve seat is provided with an air outlet ring, which is located below the ring cavity. An air outlet is set under the belt, an axial main air groove is set on the upper surface of the valve core, and a circumferential air supply hole is opened on the rib, and a diversion cone angle is set at the air supply hole. 2. A bypass-type internally guided gas injection valve for mixed intake air according to claim 1, characterized in that: the outer end of the valve seat is provided with an end pressure stabilizing chamber. 3. A bypass-type internally guided gas injection valve with mixed intake air according to claim 1 or 2, characterized in that: the valve body is provided with a protruding part, and the protruding part is provided with an air inlet, and the air inlet is below the air inlet. A guide cavity is set in the valve body, the air inlet and the guide cavity communicate to form an external space, and the external space communicates with the internal space; The gas flows vertically into the diversion chamber through the air inlet, and flows into the outer space and inner space filled with the valve body along the diversion chamber, part of which flows into the central pressure stabilization chamber through the pressure balance hole, and the end pressure stabilization chamber and diversion chamber Connected; 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 through the mixed intake mode of the axial main gas groove and the circumferential air supply hole, passes through the ring cavity, and finally flows out vertically from the gas outlet; after the coil is powered off, the main return spring and the Under the pretightening force of the auxiliary return spring, the armature moves downward, and the valve core assembly moves downward until the surface of the valve core fits the surface of the valve seat and returns to the initial position, the gas injection valve is closed, and the gas path is closed.