CN202628315U

CN202628315U - High-pressure jet mixer of natural gas engine

Info

Publication number: CN202628315U
Application number: CN2012201918604U
Authority: CN
Inventors: 宋龙甫
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-04-28
Filing date: 2012-04-28
Publication date: 2012-12-26
Anticipated expiration: 2022-04-28

Abstract

The utility model discloses a high-pressure jet mixer of a natural gas engine. The high-pressure jet mixer comprises a mixer body provided with a gas channel and an air inlet channel, a venturi ring located in the air inlet channel and a plurality of spray nozzle air inlet channels, wherein one end of each spray nozzle air inlet channel is communicated with the gas channel. An inner wall of the air inlet channel is provided with an annular groove for clamping the venturi ring, an outer side of the venturi ring is provided with a ring groove forming an annular pressure-stabilizing cavity together with the annular groove, and the ring groove is in closed connection with the annular groove. A plurality of gas spraying channels are further arranged on the mixer body, wherein one end of each gas spraying channel is communicated with the annular pressure-stabilizing cavity. The high-pressure jet mixer is small in volume and simple in assembly, adopts an internally-drilling mode to replace hose connection, decreases gas leakage points, enables gas and air to be mixed evenly, greatly solves the uniformity problem of cylinders of an engine, meets the requirement for a lean-burn technology of the electronic control natural gas engine and improves the transient state response performance of the natural gas engine.

Description

Natural gas engine high-pressure injection mixer

Technical field

The utility model relates to the jet mixer manufacturing technology field of engine fuel, refers to a kind of natural gas engine high-pressure injection mixer particularly.

Background technique

Develop rapidly along with World Economics; The rapid increase of automobile pollution; Automobile brings great convenience to people, and human social development has been made huge contribution, but consumes a large amount of petroleum resources, a large amount of harmful gas of discharge simultaneously; And environment for human survival caused bigger harm, become the primary pollution source of municipal pollution.For addressing this problem, people are seeking to restructure the use of energy always, adopt the approach of the alternative motor fuels of low public hazards.Rock gas is exactly that current operation technique is the most ripe, is to substitute one of gasoline, the most important energy of diesel oil, and gas economic property is good, discharges lowly, is the clean energy resource of generally acknowledging.Natural gas engine gets into rapid growth period thus, is the cleaning combustion source engine of generally acknowledging both at home and abroad.

The natural gas engine jet mixer is the pith of natural gas engine and electric-controlling injection system.The effect of mixer is to make rock gas and air before getting into cylinder, form uniform mixed gas; Because rock gas is different with the density of air, forms the mixture strength layering easily, causes the air fuel ratio of each cylinder mixed gas to differ greatly; Make motor Economy variation; Discharging exceeds standard, the phenomenon that can cause motor to occur catching fire when serious, and engine operation is unstable.For the work that guarantees that motor is reliable and stable, develop various mixers both at home and abroad, but at present main usefulness is two kinds of venturi-type, ratio regulating types.Ratio regulating type mixer is a kind of air fuel ratio control mode of machinery, and control accuracy is poor, and transient response is slow, can not satisfy the requirement of increasingly stringent Abgasgesetz.The venturi-type mixer is that venturi ring is embedded on air intake pipe, advances combustion gas by the venturi hole at the trunnion place of venturi ring then, and gaseous fuel many tube walls along air intake pipe after getting into mixer flow; Be difficult to the diffusion to pipeline center, along with the aperture increase of closure, air mass flow increases greatly; The rock gas that is gone out by the venturi orifice flow has little time to spread to pipeline center; Can not mix fully with air, make mixture strength more and more inhomogeneous, when particularly engine transient quickens; Slow because of gas supply, mixed gas is crossed rare phenomenon that occurs catching fire.Therefore existing motor seldom can adopt real lean burn technology; Lean-burn is exactly that the air fuel ratio of mean engine is worked under the condition near the lean-burn limit value; Lean-burn can realize further reducing the gas consumption of motor; Reduce the concentration of emission, reduce the effect of engine heat load, improve engine reliability.But the precondition that realizes lean-burn must guarantee that the mixed gas that forms is even; And rock gas tolerance is controlled accurately; Accurately control through electric control unit control and through high pressure nozzle and realize that the assurance mixed gas evenly can only be accomplished through mixer.

Adopt of the single-point discharge system of usefulness gone up the nozzle of giving vent to anger under the air inlet more at present, and air inlet/outlet lays respectively at the two ends of nozzle, with two long gas rails a plurality of blast nozzles is installed together; Because of nozzle flow is little, the nozzle that needs is many, and gas rail volume is excessive; Parts are many; Have the potential safety hazard that is prone to leakage, reliability is low, makes and the maintenance cost height; Secondly, because of fuel gas injection pressure is low, only rely on present venturi-type mixer; Combustion gas and air can not fully evenly mix; Under such condition, adopt lean-burn can cause engine fire, engine operation is unstable, and discharging is high; The combustion gas Economy descends, and can not satisfy the requirement of real lean-burn; In addition, the gas of ejection imports engine air inlet tube through long flexible pipe, causes the transient response of motor poor.

Summary of the invention

The purpose of the utility model is to overcome the defective that the mode of single-point discharge exists in the existing technology; Provide a kind of natural gas engine transient response that makes better, mixed gas mixes more even, reaches the technical requirements of lean-burn; And multiinjector high-pressure injection and venturi ring be integrated on the entity; Reduce cost, improve reliability, be convenient to the natural gas engine high-pressure injection mixer of installation and maintenance.

For realizing above-mentioned purpose; The natural gas engine high-pressure injection mixer that the utility model designed; Comprise mixer body that is provided with combustion gas road and free-air diffuser and the venturi ring that is positioned at free-air diffuser; Also comprise the nozzle gas-entered passageway that a plurality of ends all are communicated with said combustion gas road, the inwall of said free-air diffuser is provided with and is used to the circular groove that card is established venturi ring, and the outside of said venturi ring is provided with the annular groove with circular groove looping pressure stabilizing cavity; Said annular groove is connected for sealing with circular groove, also is provided with the fuel gas injection passage that a plurality of ends all are communicated with annular pressure stabilizing cavity on the said mixer body.

Preferably, also be provided with a plurality of nozzle mounting holes on the said mixer body, the other end of the other end of said nozzle gas-entered passageway and fuel gas injection passage all is communicated with the nozzle mounting hole.

Preferably, also be provided with the connected pore channel that is shaped as blind hole on the said mixer body, the opening end of said connected pore channel is provided with screw plug, and said fuel gas injection passage is connected with annular pressure stabilizing cavity through the connected pore channel.

Preferably, also be provided with gaseous-pressure sensor and/or fuel gas temperature sensor on the said combustion gas road.

Preferably, said combustion gas road be shaped as blind hole, its opening end is provided with the natural gas line joint, and both joints are provided with the O RunddichtringO.

Preferably, it is vertical with the medial axis of free-air diffuser that said a plurality of nozzle mounting hole is straight line arrangement.

Preferably, the medial axis of the medial axis in said combustion gas road and free-air diffuser is vertical.

Preferably, also be provided with a plurality of bolts hole that are used for fixing the mixer body on the said mixer body.

Preferably, also be provided with the U type pressing plate that is used for fixing nozzle on the said mixer body.

Above-mentioned natural gas engine high-pressure injection mixer is in when work, and high-pressure natural gas gets in the combustion gas road of mixer body through one-level decompression back, and the nozzle in the mounting hole of combustion gas road and nozzle communicates; Nozzle is a normally close valve, and when the ECU output low level, nozzle is closed; Combustion gas is closed in the combustion gas road; When automatical control system output high level, nozzle is performed fighting, and rock gas flows in the annular pressure stabilizing cavity at the venturi ring back side through nozzle; Spray in the main airway from the venturi hole at last, accomplish combustion gas and Air mixing.

Nozzle can be fixed in the nozzle mounting hole through the U-shaped pressing plate, and reliable installation is disassembled simple.Be provided with the annular pressure stabilizing cavity that the fuel gas injection passage leads to the venturi ring back side in the nozzle mounting hole; Because the separation from the nozzle to the venturi ring is very short; And jet pressure is very high, and the rock gas that sprays from nozzle just can be full of the annular pressure stabilizing cavity at the venturi ring back side in the very short time, and in annular pressure stabilizing cavity, sets up high gaseous-pressure; The combustion gas of high pressure sprays into through free-air diffuser center in the free-air diffuser through the venturi hole of venturi ring; Trunnion size through adjustment jet pressure and venturi ring makes both cooperatively interacting, and occurs overlapping with the combustion gas Shu Buhui that guarantees from venturi ring, to spray; Reach the purpose that combustion gas and air rapid and uniform are mixed, solved Venturi tube mixer and when big flow, mixed uneven problem.

In addition, in order to make air fuel ratio control more accurate, satisfy the technical requirements of lean-burn; The utility model increases gaseous-pressure sensor and fuel gas temperature sensor on the combustion gas road; The variation of the temperature and pressure of monitoring rock gas is revised the amount of natural gas of spraying in good time, realizes the accurate control to gasoline air mixture ratio; Realize the lean-burn control of motor, satisfy the requirement of engine power performance and discharging.

The beneficial effect of the utility model: the natural gas engine high-pressure injection mixer that is provided; Effective combination with high pressure nozzle and venturi ring; Make combustion gas and air mixing more even; Improve motor cylinder uniformity problem greatly, reach the requirement of electric-controlled natural gas engine lean burn technology, improved the transient response performance of natural gas engine.Combustion gas road, nozzle mounting hole and part free-air diffuser all are integrated on the parts, and volume is little, makes assembling simpler; The flexible pipe that the mode of employing internal bore has substituted present use connects, and has reduced the gas leakage point, has reduced potential safety hazard; Substituted present use through U-shaped pressing plate fixed nozzle and pressed from both sides the mounting type of nozzle up and down, simplified the assembly structure of nozzle greatly, made installation, dismounting easier through many gas rail; Better reliability can realize non-maintaining.

Description of drawings

Fig. 1 is the main TV structure schematic representation of the natural gas engine high-pressure injection mixer of the utility model.

Fig. 2 is the left TV structure schematic representation of Fig. 1.

Fig. 3 is the plan structure schematic representation of Fig. 1.

Fig. 4 is the A-A sectional structure schematic representation among Fig. 3.

Fig. 5 is the B-B sectional structure schematic representation among Fig. 3.

Fig. 6 is the C-C sectional structure schematic representation among Fig. 3.

Fig. 7 is the D-D sectional structure schematic representation among Fig. 3.

Fig. 8 is the perspective view of the natural gas engine high-pressure injection mixer of the utility model.

Among the figure: mixer body 1, venturi ring 2, free-air diffuser 3, nozzle mounting hole 4, combustion gas road 5; Circular groove 6, annular groove 7, annular pressure stabilizing cavity 8, venturi hole 9, fuel gas injection path 10; Connected pore channel 11, screw plug 12, nozzle gas-entered passageway 13, gaseous-pressure sensor 14, fuel gas temperature sensor 15; Natural gas line joint 16, nozzle 17, U type pressing plate 18, bolt 19, bolt hole 20.

Embodiment

Below in conjunction with accompanying drawing and specific embodiment the utility model is done further to describe in detail.

Shown in Fig. 1～8; Present embodiment adopts nozzle 17 and the coupling of natural gas engine high-pressure injection mixer; This mixer comprises mixer body 1 that is provided with combustion gas road 5, free-air diffuser 3, a plurality of nozzle mounting holes 4 and the venturi ring 2 that is positioned at free-air diffuser 3; Also comprise a plurality of nozzle gas-entered passageways 13, the two ends of nozzle gas-entered passageway 13 are communicated with combustion gas road 5 and nozzle mounting hole 4 respectively, and the inwall of free-air diffuser 3 is provided with and is used to the circular groove 6 that card is established venturi ring 2; The outside of venturi ring 2 is provided with the annular groove 7 with circular groove 6 looping pressure stabilizing cavities 8; Annular groove 7 and circular groove 6 also is provided with a plurality of fuel gas injection path 10s for sealing is connected on the mixer body 1, the two ends of fuel gas injection path 10 are respectively with annular pressure stabilizing cavity 8 and be communicated with 4 connections of nozzle mounting hole.The aditus laryngis place internal diameter of venturi ring 2 which is provided with a plurality of venturi hole 9 less than the diameter of free-air diffuser 3, and venturi hole 9 is evenly and at intervals along the aditus laryngis place that circumferentially is opened in venturi ring 2.

As shown in Figure 4, nozzle 17 is installed in the nozzle mounting hole 4, and the end that nozzle gas-entered passageway 13 inserts nozzle mounting hole 4 directly links to each other with nozzle 17.It is vertical with the medial axis of free-air diffuser 3 that a plurality of nozzle mounting holes 4 are straight line arrangement, and the medial axis in combustion gas road 5 is vertical with the medial axis of free-air diffuser 3.Also be provided with a plurality of U type pressing plates 18 that are used for fixing the bolt hole 20 of mixer body 1 and are used for fixing nozzle 17 on the mixer body 1.

Like Fig. 5, shown in 6, also be provided with the connected pore channel 11 that is shaped as blind hole on the mixer body 1, the opening end of connected pore channel 11 is provided with screw plug 12, and the fuel gas injection path 10 is connected with annular pressure stabilizing cavity 8 through connected pore channel 11.

As shown in Figure 7 again, combustion gas road 5 be shaped as blind hole, its opening end is provided with natural gas line joint 16, and both joints are provided with the O RunddichtringO.Also be provided with gaseous-pressure sensor 14 and fuel gas temperature sensor 15 on the combustion gas road 5.All there is the O RunddichtringO to seal between gaseous-pressure sensor 14 and fuel gas temperature sensor 15 and the mixer body 1.Natural gas line joint 16 links with the post-decompression natural gas line of one-level.

In the present embodiment, nozzle 17 adopts commercially available high-pressure injection nozzle, and it comprises a pressure chamber and the nozzle chambers that is positioned at the pressure chamber below, with three nozzle 17 couplings to satisfy the requirement of medium and heavy motor below 350 horsepowers.Nozzle 17 is installed in 1 last time of mixer body and compresses through U type pressing plate 18; Fixing through bolt 19 again; When nozzle 17 is fixed in the nozzle mounting hole 4; Nozzle 17 is provided with two road sealing strips, and the seam crossing that one sealing strip is located at nozzle 17 and nozzle mounting hole 4 to be preventing rock gas to external leakage, and another road sealing strip is located at the seam crossing of pressure chamber and nozzle gas-entered passageway 13 of nozzle 17 to prevent that rock gas is to the leakage of the nozzle side of giving vent to anger.

Specifically; The shape size of nozzle mounting hole 4 and nozzle 17 is complementary, and nozzle mounting hole 4 be simple three step circular holes, near the O type circle correspondence of two steps and the nozzle 17 of opening end; Nozzle mounting hole 4 can be a plurality of, and its quantity can increase according to the needs of motor or reduce.The fuel gas injection path 10 of the bottom of nozzle mounting hole 4 should design shortly from the distance of the annular pressure stabilizing cavity 8 of venturi ring 2 as far as possible, helps to improve the mapping of fuel gas supply and the response performance of motor.

Above-mentioned natural gas engine high-pressure injection mixer is when work; Engine charge gets into from free-air diffuser 3; Rock gas gets into combustion gas road 5 from natural gas line joint 16, and gas is got into respectively in the pressure chamber of each nozzle 17 by each nozzle gas-entered passageway 13 then, and the pressure in gaseous-pressure in the pressure chamber and the combustion gas road 5 keeps about 10bar; Gaseous-pressure sensor 14 and fuel gas temperature sensor 15 are installed on combustion gas road 5; Two sensor in real time are measured the pressure and temperature of rock gas in the combustion gas road 5 here, and data are passed to automatical control system, so that automatical control system is revised the quality of natural gas of spraying.After rock gas got into nozzle mounting hole 4, because of nozzle 17 is a normally close valve, when the high level that does not have electric control system controls nozzle 17 drove pulsewidth, nozzle 17 was closed, and pressure chamber and nozzle chambers are two independently closed chambers.When automatical control system sent high level for nozzle 17 to drive pulsewidth, nozzle 17 was opened, and controlled the flow that gas flow is crossed nozzle through the opening time of control nozzle 17.After nozzle is opened; Rock gas in the nozzle chambers that rock gas gets into nozzle 17 from pressure chamber, nozzle chambers gets in the connected pore channel 11 through the fuel gas injection path 10 again, gets in the annular pressure stabilizing cavity 8 at venturi ring 2 back sides again; Because of the internal volume of annular pressure stabilizing cavity 8 little; Be full of annular pressure stabilizing cavity 8 very soon from the rock gas of nozzle 17 ejections, and set up certain pressure, under the effect of this pressure; Rock gas at the aditus laryngis place of venturi ring 2 in venturi hole 9 sprays into free-air diffuser 3, and with free-air diffuser 3 in air mixing.Because the rock gas in the annular pressure stabilizing cavity 8 has certain pressure, the rock gas bundle of ejection can overcome the central position that resistance arrives free-air diffuser 3 from venturi hole 9, and the rapid and uniform of favourable combustion gas and air is mixed.

To sum up, the utility model uses the high pressure nozzle of the bottom turnover gas formula of high-performance, high flow capacity, cooperates venturi ring; The installation of high pressure nozzle and the mixing of combustion gas on an entity, have been realized; Shortened the distance of combustion gas from the nozzle to the hybrid ring greatly, broken away from the mode nozzle complex installation structure of giving vent to anger under the air inlet on the Traditional use, and solved and occur mixing uneven problem when the employing venturi ring is blended in big load; Make mixing more even; Improve motor cylinder uniformity problem greatly, reach the requirement of electric-controlled natural gas engine lean burn technology, improved the transient response performance of natural gas engine.Make assembling simpler, better reliability, very non-maintaining to accomplishing.

Claims

1. natural gas engine high-pressure injection mixer; Comprise mixer body (1) that is provided with combustion gas road (5) and free-air diffuser (3) and the venturi ring (2) that is positioned at free-air diffuser (3); It is characterized in that: also comprise the nozzle gas-entered passageway (13) that a plurality of ends all are communicated with said combustion gas road (5); The inwall of said free-air diffuser (3) is provided with and is used for card and establishes the circular groove of venturi ring (2) (6); The outside of said venturi ring (2) is provided with the annular groove (7) with circular groove (6) looping pressure stabilizing cavity (8); Said annular groove (7) is connected for sealing with circular groove (6), also is provided with the fuel gas injection passage (10) that a plurality of ends all are communicated with annular pressure stabilizing cavity (8) on the said mixer body (1).

2. natural gas engine high-pressure injection mixer according to claim 1; It is characterized in that: also be provided with a plurality of nozzle mounting holes (4) on the said mixer body (1), the other end of the other end of said nozzle gas-entered passageway (13) and fuel gas injection passage (10) all is communicated with nozzle mounting hole (4).

3. natural gas engine high-pressure injection mixer according to claim 1; It is characterized in that: also be provided with the connected pore channel (11) that is shaped as blind hole on the said mixer body (1); The opening end of said connected pore channel (11) is provided with screw plug (12), and said fuel gas injection passage (10) is connected with annular pressure stabilizing cavity (8) through connected pore channel (11).

4. natural gas engine high-pressure injection mixer according to claim 1 is characterized in that: also be provided with gaseous-pressure sensor (14) and/or fuel gas temperature sensor (15) on the said combustion gas road (5).

5. natural gas engine high-pressure injection mixer according to claim 1 is characterized in that: said combustion gas road (5) be shaped as blind hole, its opening end is provided with natural gas line joint (16), and both joints are provided with the O RunddichtringO.

6. natural gas engine high-pressure injection mixer according to claim 1 is characterized in that: said a plurality of nozzle mounting holes (4) are a straight line and arrange vertical with the medial axis of free-air diffuser (3).

7. natural gas engine high-pressure injection mixer according to claim 1 is characterized in that: the medial axis in said combustion gas road (5) is vertical with the medial axis of free-air diffuser (3).

8. according to each described natural gas engine high-pressure injection mixer of claim 1～7, it is characterized in that: also be provided with a plurality of bolts hole (20) that are used for fixing mixer body (1) on the said mixer body (1).

9. according to each described natural gas engine high-pressure injection mixer of claim 1～7, it is characterized in that: also be provided with the U type pressing plate (18) that is used for fixing nozzle (17) on the said mixer body (1).