CN107084076B

CN107084076B - Integrated annular manifold wall surface gas fuel injection mixing device for mixed air intake

Info

Publication number: CN107084076B
Application number: CN201710504573.1A
Authority: CN
Inventors: 宋恩哲; 范立云; 姚崇; 杨立平; 董全; 孙军
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2023-06-09
Anticipated expiration: 2037-06-28
Also published as: CN107084076A

Abstract

The invention aims to provide an integrated annular manifold wall gas fuel injection mixing device for mixing air inlet, wherein gas fuel is conveyed to the device through a pipeline and firstly passes through a gas injection valve, and an actuator controls a valve core to control valve opening and closing; the stability of valve opening and closing can be ensured through the guide pin, the pressure balance hole, the pressure balance groove and the pressure stabilizing cavity, and the responsiveness of gas supply and gas interruption of the device is enhanced; the high flow is realized by a mixed air inlet mode of direct air inlet of the main air groove in the valve and air inlet of the circumferential air-filling holes, and meanwhile, air flow interference can be avoided, and the air supply stability of the device is realized; the fuel can be distributed in the whole device through the cavity structure of the fuel diffusion pipe, so that the continuity and the responsiveness of the air supply device are realized; through the branch pipe chute structure, the ejected gas fuel forms vortex, promotes the mixing degree of fuel and air, is favorable for combustion, and improves the working performance of the device.

Description

Integrated annular manifold wall surface gas fuel injection mixing device for mixed air intake

Technical Field

The invention relates to an air inlet device, in particular to an air inlet device of a gas fuel engine.

Background

The continuously improved emission standard and the increasingly severe energy crisis problem provide new challenges for the engine technology, and a plurality of gas fuels taking natural gas as the initial fuel for the engine are important research points of a plurality of scientific researchers at home and abroad, and the gas fuel engine is also an object of extensive research. The whole set of air inlet device comprises a plurality of parts from a gas injection valve to an air inlet manifold to a cylinder air valve and the like, and each part through which fuel and air flow has important significance for the performance of the gas fuel engine. For the injection of the gas fuel, the injection flow is required to be large, the injection efficiency is high, and meanwhile, the injection stability and the responsiveness are required to be good; for the flow of the gas fuel and the air, it is necessary to enable the gas fuel and the air to be sufficiently mixed before entering the cylinder, so as to improve the fuel combustion efficiency and save energy consumption. Therefore, in order to achieve the above object, the present invention specifically designs an integrated annular manifold wall gas fuel injection mixing device for mixing intake air. The air inlet integrated system improves the functions of the whole air inlet device, has the characteristics of quick fuel supply response, high stability and large flow, and can fully mix fuel and air before entering the cylinder, thereby improving the combustion efficiency.

In order to achieve high responsiveness of fuel supply and adequate mixing of fuel and air, many researchers have studied a series of air intake systems, and these system structures, while providing a better method for fuel gas supply, have some drawbacks. For example: in the CN106050479a patent, "a gas injection valve and injection pipe structure, an installation and arrangement method" describes a gas injection valve and a nozzle structure of an engine, which are characterized in that a plurality of rows of nozzles are opened on the side wall of the nozzle, and the nozzles of each row are staggered, so that the mixing of fuel and air is enhanced to a certain extent, but after the gas fuel is sprayed out from the nozzles, the concentration of the gas in the radial direction of the air inlet channel is gradually reduced, which also causes insufficient mixing of the fuel and air.

Disclosure of Invention

The invention aims to provide an integrated annular manifold wall surface gas fuel injection mixing device for mixing air with fuel and air, which has good mixing degree and high combustion efficiency.

The purpose of the invention is realized in the following way:

the invention relates to an integrated annular manifold wall surface gas fuel injection mixing device for mixed air intake, which is characterized in that: comprises a fuel gas injection valve, a connecting gas hood and a fuel diffusion pipe;

the gas injection valve comprises a valve body, a valve seat, an electromagnet and a valve core assembly, wherein the electromagnet is arranged on the valve body, the valve body is arranged on the valve seat, a valve space is formed among the electromagnet, the valve body and the valve seat, a coil is wound in the electromagnet, the valve core assembly is positioned in the valve space and arranged below the electromagnet, the valve core assembly comprises an armature, a spring seat, a bottom plate, a valve core and a guide pin, the armature, the bottom plate and the valve core are arranged from top to bottom and are simultaneously connected together through fastening bolts, the spring seat is positioned outside the armature and forms an annular groove with the armature, the electromagnet is internally provided with an annular groove, two ends of a main reset spring are respectively arranged in the annular groove of the electromagnet and the annular groove of the spring seat, a guide pin is arranged at the center of the armature, the guide pin extends into the electromagnet, two ends of the auxiliary reset spring are respectively contacted with the electromagnet and the guide pin, a pressure balance hole is arranged in the guide pin, the bottom plate is provided with a pressure balance groove, the valve core is of a hollow structure, a central pressure stabilizing cavity is arranged on the valve seat below the valve core, the outer end of the valve seat is provided with an end stabilizing cavity, the pressure balance hole, the hollow part of the valve core and the central stabilizing cavity are communicated with the central stabilizing cavity to form an inner space, a sealing ring is arranged on the upper part, a sealing ring is arranged, a cone angle is arranged on the sealing ring is arranged on the annular ring, an annular ring is arranged on the upper surface of the air outlet ring is arranged on the annular ring and is arranged on the air outlet ring and lower surface and arranged on the annular ring and lower ring is arranged on the air outlet ring and lower surface;

the fuel diffusion tube comprises a gas tube main body, the gas tube main body comprises a main tube and branch tubes, the main tube is of a circular ring structure with a cavity, a main tube communication hole is formed in the circular ring structure, a main tube central hole is formed in the middle of the circular ring, the front end of each branch tube is communicated with the circular ring structure of the main tube, the main tube is connected with a connecting gas hood and communicated with the air inlet channel, the central hole of the main tube is communicated with an air inlet channel, a gas mixing area is formed in a branch tube area behind the central hole of the main tube, all branch tubes are distributed around the wall of an air inlet manifold, and inclined slots are formed in the inner sides of the branch tubes;

the air outlet hole is communicated with the air cover.

The invention may further include:

1. the upper part of one end of the main pipe connected with the gas hood is of a wave-shaped structure, and the communicating hole of the main pipe is of a round platform structure.

2. The tail ends of the branch pipes are provided with semicircular open holes, and the inclined slots on each branch pipe are respectively 30 degrees, 45 degrees and 60 degrees with the axis of the air inlet manifold.

3. The valve body is provided with a protruding part, the protruding part is provided with an air inlet, a flow guide cavity is arranged in the valve body below the air inlet, the air inlet and the flow guide cavity are communicated and form an external space, and the external space is communicated with the internal space;

the fuel gas vertically flows into the flow guiding cavity through the air inlet, flows into an external space and an internal space filled in the valve body along the flow guiding cavity, one part of the fuel gas flows into the central pressure stabilizing cavity through the pressure balancing hole, and the end pressure stabilizing cavity is communicated with the flow guiding cavity;

when the coil is not electrified in the working process of the gas injection valve, under the pretightening force of the main reset spring and the auxiliary reset spring, the sealing ring belt on the valve core is tightly matched with the upper surface of the valve seat, and the gas fills the external space and the internal space inside the valve body of the gas injection valve; after the coil is electrified, the armature is acted by upward electromagnetic force, the valve core assembly moves upward after overcoming the pretightening force of the main reset spring and the auxiliary reset spring, the valve core is separated from the surface of the valve seat, the gas injection valve is opened, the gas channel is opened, the gas flows in a mixed gas inlet mode of the axial main gas groove and the circumferential gas supplementing holes, flows out vertically through the annular cavity and enters the connecting gas cover through the gas outlet holes, then enters the fuel diffusion pipe, the gas diffuses in the annular structure of the main pipe and flows into each branch pipe, the gas flowing into the branch pipes is sprayed into the gas mixing area through each chute, meanwhile, the air enters the gas mixing area from the air inlet channel through the central hole of the main pipe, and the gas and the air are mixed and flow into the air inlet manifold under the action of vortex; after the coil is powered off, under the pretightening force of the main reset spring and the auxiliary reset spring, the armature moves downwards, the valve core assembly moves downwards integrally until the surface of the valve core is attached to the surface of the valve seat, the valve returns to the initial position again, the gas injection valve is closed, and the gas path is closed.

The invention has the advantages that: the invention has the characteristics of high fuel injection stability and large flow, and has the advantages of good fuel and air mixing degree and high combustion efficiency; the stability of valve opening and closing can be ensured through the guide pin, the pressure balance hole, the pressure balance groove and the pressure stabilizing cavity, and the responsiveness of gas supply and gas interruption of the device is enhanced; the high flow is realized by a mixed air inlet mode of direct air inlet of the main air groove in the valve and air inlet of the circumferential air-filling holes, and meanwhile, air flow interference can be avoided, and the air supply stability of the device is realized; the fuel can be distributed in the whole device through the cavity structure of the fuel diffusion pipe, so that the continuity and the responsiveness of the air supply device are realized; through the branch pipe chute structure, the ejected gas fuel forms vortex, promotes the mixing degree of fuel and air, is favorable for combustion, and improves the working performance of the device.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a general schematic diagram of a gas injection valve;

FIG. 3 is a schematic diagram of a valve cartridge assembly;

FIG. 4 is a perspective view of a fuel diffusion tube;

FIG. 5 is a front view of a fuel diffusion tube;

fig. 6 is a flow diagram of a gaseous fuel.

Detailed Description

The invention is described in more detail below, by way of example, with reference to the accompanying drawings:

referring to fig. 1 to 6, an integrated annular manifold wall gas fuel injection mixing device for mixing intake air in the present invention is divided into a gas injection valve 1, a connecting gas hood 2 and a fuel diffusion pipe 3. The gas injection valve 1 mainly comprises an electromagnet 4, a main reset spring 5, an auxiliary reset spring 6, a valve core assembly 7, a valve body 8 and a valve seat 9, wherein the electromagnet 4 is fixed on the valve body 8 through a fixing bolt, a straight groove with a certain depth is formed in the center of the electromagnet, the auxiliary reset spring 6 is arranged at the top in the straight groove, and a coil is wound in a ring groove in the electromagnet 4; a valve core assembly 7 is arranged below the electromagnet, and a valve seat 9 structure is arranged below the valve core assembly 7; the valve seat 9 and the valve body 8 are fixedly connected together through bolts, and the matching surface between the valve seat 9 and the valve body is sealed through a sealing rubber ring. The gas hood 2 has the function of dividing the original mixed gas passage into two parts for respectively circulating gas fuel and air, adopts a large round corner structure, avoids throttling loss caused by the corner structure, and enhances the gas supply capacity of the device. One end of the gas cover 2 is tightly connected with the outlet of the gas injection valve 1, the other end is tightly connected with the fuel diffusion pipe 3, and the fuel is sprayed out from the gas injection valve 1 and enters the diffusion pipe 3 through the gas cover 2. The fuel diffusion pipe 3 is positioned in the air inlet manifold and is closely arranged on the air inlet manifold, and can be divided into a main pipe 20 and a branch pipe 21 according to the structural characteristics, wherein the main pipe 20 is of an annular cavity structure connected with the air cover 2, and the central hole of the main pipe is connected with an air inlet channel; on the other side of the main pipe 20, a plurality of branch pipes 21 are connected, and the main pipe 20 and the branch pipes 21 are communicated with each other. A series of inclined grooves 22 with different angles are formed on the inner side walls of the branch pipes 21, the inclined grooves adopt a gradual change mode, the gas fuel can flow into a gas mixing zone from each branch pipe 21 through the series of inclined grooves, the gas fuel sprayed into the mixing zone from the branch pipe 21 forms vortex, and the mixing of the fuel and the air is accelerated; the branch pipe ends are provided with semicircular holes to prevent the gas fuel from being blocked in the branch pipe.

Fig. 3 shows a valve core assembly 7 positioned in a valve body 8, mainly comprising a guide pin 11, an armature 12, a spring seat 13, a bottom plate 14 and a valve core 18, and is characterized in that: the armature 12, the spring seat 13, the bottom plate 14 and the valve core 18 are connected together from top to bottom through fastening bolts, the side surface inside the spring seat 13 is contacted with the side surface of the armature 12, and the main return spring 5 is positioned in an annular groove between the electromagnet 4 and the spring seat 13; a guide pin 11 is arranged between a central straight groove of the electromagnet 4 and a central hole of the armature 12, one end of the guide pin 11 is fixed with the armature 12 by using a clamp spring, and the other end of the guide pin is propped against an auxiliary reset spring 6 in the straight groove of the electromagnet 4, so that the valve core assembly 7 can keep verticality in the moving process, and the working reliability of the valve core assembly is enhanced; meanwhile, a pressure balance hole 16 is formed in the guide pin 11, and the pressure balance hole 16 is communicated with the outer space of the valve core 18 through a pressure balance groove 17 on the bottom plate 14, so that the pressure balance between the inner and outer sides of the valve core 18 is realized, the armature 12 can be prevented from being subjected to axial force, and the response speed of the armature 12 is improved; the valve core 18 consists of a valve core main body 18, ribs 19 and a sealing ring belt 15, and circumferential air supplementing holes 25 are formed in the ribs 19 of the valve core 18, so that the fuel flow is increased and the air flow interference is reduced;

when the coil is not electrified in the working process of the gas injection valve, under the pretightening force of the main reset spring 5 and the auxiliary reset spring 6, the valve core assembly 7 is kept at the initial position, the lower surface of the sealing ring belt 15 of the valve core 18 in the valve core assembly 7 is tightly attached to the upper surface of the gas outlet ring belt 10 of the valve seat 9, at the moment, the gas outlet ring belt 10 is not communicated with the inner space of the valve body 8, and the gas is filled in the whole space inside the valve body 8 of the gas injection valve.

The pressure stabilizing cavities 26 are arranged at the center and the periphery of the valve seat 9, so that fluctuation of the gas pressure in the gas injection valve can be effectively restrained, ventilation can be uniform, stable and reliable operation of gas flow is realized, and high response speed is realized.

When the engine enters an air intake stroke, the coil is electrified, the electromagnet 4 and the armature 12 are magnetized, a magnetic loop is formed between the electromagnet 4 and the armature 12, the armature 12 moves upwards after overcoming the pretightening force of the main reset spring 5 and the auxiliary reset spring 6 under the action of electromagnetic force, the valve core 18 is driven to move upwards to be separated from the surface of the valve seat 9 until the upper surface of the spring seat 13 contacts with the lower surface of the electromagnet 4, the axial movement and the circumferential positioning of the armature 12 are controlled by the cooperation between the guide pin 11 and the electromagnet 4 in the whole movement process, at the moment, the air passage is opened, the electromagnetic valve is opened, air flows in rapidly by the mixed air inlet mode of the axial main air groove 24 and the circumferential air supplementing holes 25, the air inlet mode can increase the air inlet flow coefficient, the air supply efficiency of the device is effectively improved, meanwhile, the air flow interference can be avoided, and the balance and the stability of the air passage are realized; then, the air passes through the multi-channel annular cavity 27 and finally flows out vertically through the air outlet 28;

the fuel flows into the fuel diffusion tube 3 through the gas hood 2, the gas fuel diffuses in the circular ring structure of the main tube 20 and flows into each branch tube 21, the gas fuel flowing into each branch tube 21 is sprayed into the gas mixing area through each chute 22, meanwhile, fresh air enters into the gas mixing area from the air inlet channel through the central hole of the main tube, the air boundary layer formed by the manifold wall is destroyed due to the distribution of the branch tubes at the position close to the air inlet manifold, the turbulent energy of the air flow is increased, in addition, the chute 22 on the branch tube adopts gradual angle design, so that the gas fuel can generate vortex when being sprayed into the mixing area, and the fuel and the air can be fully mixed and then flow into the cylinder under the action of the vortex.

After the air intake stroke of the engine is finished, the coil in the gas injection valve 1 is powered off, electromagnetic force born by the armature 12 disappears, the armature 12 moves downwards under the action of the main return spring 5 between the electromagnet 4 and the spring seat 13 and the auxiliary return spring 6 between the guide pin 11 and the electromagnet 4 to drive the valve core 18 to move downwards until the surface of the valve core 18 is attached to the surface of the valve seat 9, the armature 12 is restored to the initial position, the air path is closed, and the gas injection valve 1 is closed. The flow of fuel in the fuel diffusion tube 3 is substantially stopped and the fuel is stored in the gas hood 2, the main tube 20 and the respective branch tubes 21. When the next intake stroke is reached, the gas injection valve 1 and the cylinder air valve are opened, and the fuel stored in the gas hood 2, the main pipe 20 and the branch pipe 21 is pushed to the gas mixing area by the subsequent fuel and enters the cylinder after being mixed with the air, so that the responsiveness of the whole air intake device for air supply is improved.

The invention relates to an integrated annular manifold wall surface gas fuel injection mixing device for mixing air inlet, which is divided into a gas injection valve, a connecting gas hood and a fuel diffusion pipe. The gas injection valve mainly comprises an electromagnet, a main and auxiliary reset spring, a valve core assembly, a valve body and a valve seat, wherein the electromagnet is fixed on the valve body through a fixing bolt, a straight groove with a certain depth is formed in the center of the electromagnet, the auxiliary reset spring is arranged at the top of the straight groove, and a coil is wound in a ring groove in the electromagnet; a valve core assembly is arranged below the electromagnet, the valve core assembly is positioned in the valve body and mainly comprises a guide pin, an armature, a spring seat, a bottom plate and a valve core, the armature, the spring seat, the bottom plate and the valve core are connected together through a fastening bolt from top to bottom, the side surface inside the spring seat is contacted with the side surface of the armature, and a main reset spring is positioned in an annular groove between the electromagnet and the spring seat; a guide pin is arranged between the central straight slot of the electromagnet and the central hole of the armature, one end of the guide pin is used for fixing the guide pin and the armature by using a clamp spring, and the other end of the guide pin is propped against an auxiliary reset spring in the straight slot of the electromagnet, so that the valve core assembly can keep verticality in the moving process, and the working reliability of the valve core assembly is enhanced; the valve core consists of a valve core main body, ribs and a sealing ring belt, wherein the ribs of the valve core are provided with circumferential air supplementing holes, so that the fuel flow is increased and the air flow interference is reduced at the same time; a valve seat structure is arranged below the valve core; the valve seat is fixedly connected with the valve body through bolts, and the matching surface between the valve seat and the valve body is sealed through a sealing rubber ring. The gas cover is used for dividing the original mixed gas channel into two parts and respectively circulating the gas fuel and the air. One end of the gas cover is tightly connected with the outlet of the gas injection valve, the other end of the gas cover is tightly connected with the fuel diffusion pipe, and fuel is sprayed out from the gas injection valve and enters the diffusion pipe through the gas cover. The fuel diffusion pipe is positioned in the air inlet manifold and is closely arranged on the air inlet manifold, and can be divided into a main pipe and a branch pipe according to the structural characteristics, wherein the main pipe is of an annular cavity structure connected with the air cover, and the central hole of the main pipe is connected with the air inlet channel; the other side of the main pipe is connected with a plurality of branch pipes, and the main pipe and the branch pipes are mutually communicated. A series of inclined grooves with different angles are formed in the inner side walls of the branch pipes, the angles of the inclined grooves are gradually changed, gas fuel can flow into a gas mixing area from each branch pipe through the series of inclined holes, the gas fuel sprayed into the mixing area from the branch pipe forms vortex, and the mixing of the fuel and air is accelerated; the branch pipe ends are provided with semicircular holes to prevent the gas fuel from being blocked in the branch pipe.

The guide pin part in the fuel gas injection valve is positioned in the central grooves of the electromagnet and the armature, and a pressure balance hole is formed in the central position and communicated with a circumferential pressure balance groove formed in the bottom plate below the guide pin, so that the internal and external gas paths are balanced, the internal and external fuel gas of the valve core assembly has no pressure difference, and the valve core assembly is prevented from receiving additional axial force during movement.

The joint part of the valve core assembly and the valve seat in the fuel gas injection valve adopts a mode that a sealing ring belt and an air outlet ring belt are distributed in a staggered mode to carry out surface sealing, and meanwhile, the large ring belt structure can reduce the structural quality, reduce the impact and improve the working stability of the device.

The center and the periphery of the gas injection valve seat in the device are provided with pressure stabilizing cavities, the pressure stabilizing cavity at the center of the valve seat is communicated with the gas space inside the valve core assembly, and the pressure stabilizing cavity at the periphery of the valve seat is communicated with the flow guiding cavity inside the valve body, so that fluctuation of the gas pressure inside the valve can be effectively restrained, the working stability of the device is improved, and the high response speed of the device is realized.

The fuel injection outlet passage part in the device consists of a main air groove in the valve body, a central hole of a valve core rib plate, a valve core sealing ring groove and a valve seat air outlet ring groove; when the gas injection valve is in a closed state, the sealing ring grooves are in staggered contact with the air outlet ring grooves to form a sealing surface, so that fuel is prevented from entering the air inlet manifold; when the gas injection valve is opened, fuel can enter the gas outlet ring groove from the main gas groove, and can also enter the gas outlet ring groove from the rib plate center Kong Jingmi seal ring groove; the mixed air inlet mode increases the air inlet flow coefficient, realizes the large flow of the device, effectively improves the air supply efficiency of the air inlet device, can avoid air flow interference, and realizes the air supply stability of the whole device.

The surface structure of the gas hood part in the device adopts a larger curvature radius, so that a sharper edge angle structure is avoided, and the throttling loss of fuel in the process of spraying the fuel from the injection valve into the main body part of the gas pipe through the gas hood can be reduced.

The branch pipes in the fuel diffusion pipe in the device are uniformly arranged at the position close to the pipe wall of the gas manifold, and the structural design can destroy an air boundary layer formed by the pipe wall when the fuel gas circulates, and increase the turbulent energy of the air flow so as to enhance the mixing between the fuel and the air.

The integrated annular manifold wall gas fuel injection mixing device for mixing air inlet can enhance fuel supply responsiveness, and firstly, a fuel gas injection valve adopts a guide pin and pressure balance hole structure to enhance valve core opening responsiveness; when the gas injection valve is opened, fuel flows into the dye diffusion pipe through the gas hood, flows into the air inlet manifold through a series of chute effects, forms vortex, is fully mixed with air, and finally flows into the cylinder; after the gas injection valve and the cylinder air valve are closed, the device can isolate the fuel from the air to a certain extent, so that the gas fuel which is injected from the injection valve but cannot enter the cylinder in time can be stored in the cavity of the fuel diffusion pipe to prevent diffusion loss, and after the gas injection valve and the cylinder air valve are opened next time, part of the gas fuel can be rapidly supplied into the cylinder for combustion, and the fuel supply responsiveness is improved.

Claims

1. An integrated annular manifold wall gas fuel injection mixing device for mixing air intake is characterized in that: comprises a fuel gas injection valve, a connecting gas hood and a fuel diffusion pipe;

the air outlet hole is communicated with the air cover.

2. An integrated annular manifold wall gaseous fuel injection mixing apparatus for mixing an intake air of claim 1, wherein: the upper part of one end of the main pipe connected with the gas hood is of a wave-shaped structure, and the communicating hole of the main pipe is of a round platform structure.

3. An integrated annular manifold wall gaseous fuel injection mixing apparatus for mixing an intake air according to claim 1 or 2, wherein: the tail ends of the branch pipes are provided with semicircular open holes, and the inclined slots on each branch pipe are respectively 30 degrees, 45 degrees and 60 degrees with the axis of the air inlet manifold.

4. An integrated annular manifold wall gaseous fuel injection mixing apparatus for mixing an intake air according to claim 1 or 2, wherein: the valve body is provided with a protruding part, the protruding part is provided with an air inlet, a flow guide cavity is arranged in the valve body below the air inlet, the air inlet and the flow guide cavity are communicated and form an external space, and the external space is communicated with the internal space;

5. An integrated annular manifold wall gaseous fuel injection mixing apparatus for mixing intake air according to claim 3, wherein: the valve body is provided with a protruding part, the protruding part is provided with an air inlet, a flow guide cavity is arranged in the valve body below the air inlet, the air inlet and the flow guide cavity are communicated and form an external space, and the external space is communicated with the internal space;