CN114837777A

CN114837777A - Injection mechanism

Info

Publication number: CN114837777A
Application number: CN202210506876.8A
Authority: CN
Inventors: 王泽�
Original assignee: Guangxi Boshengdi Technology Co ltd
Current assignee: Guangxi Boshengdi Technology Co ltd
Priority date: 2022-05-11
Filing date: 2022-05-11
Publication date: 2022-08-02
Anticipated expiration: 2042-05-11
Also published as: CN114837777B

Abstract

The invention discloses an injection mechanism, comprising: the metering valve is communicated with the liquid channel to supply the metering fluid; the gas channel includes: a winding section spirally wound along an outside of the metering valve and extending beyond a jetting direction; the tapered spiral section is coiled along the end face of the injection end of the metering valve, and the radius of the tapered spiral section is gradually reduced; the coiling section is communicated with the gradually-reduced spiral section, the gradually-reduced spiral section is connected into the mixing chamber in a mode of being tangent to the inner wall of the mixing chamber, gas is input into the coiling section, enters the gradually-reduced spiral section after being spirally coiled outside the metering valve and then enters the mixing chamber, and a fluid heat dissipation cover is formed on the outer portion of the metering valve and the end face of the spraying end of the metering valve. The invention can improve the high-temperature protection of the metering valve and reduce the crystallization risk of urea.

Description

Injection mechanism

Technical Field

The invention relates to the technical field of injection components, in particular to an injection mechanism for an engine or an exhaust gas treatment system.

Background

The previously applied chinese patent application No. 202120886727X discloses a multi-stage injection mechanism, which is designed to include a metering valve and an injection valve, to accurately meter urea, mix with gas, and then spray at high speed, to achieve the effect of accurate metering and efficient atomization. However, an injection valve is additionally arranged at the front end of the metering valve, so that the product cost is increased, the injection formation is lengthened, the time for injecting the exhaust pipe is prolonged, the response speed is reduced, and the tail gas treatment effect is finally influenced. In the multi-stage injection mechanism, the fluid such as gas and urea mainly takes away heat in the flow channel, but part of the heat is transferred to the metering valve through the shell or the wall body, so that the metering valve is subjected to high temperature, and crystallization is easily generated. Further optimization of the structure is therefore required.

Disclosure of Invention

It is an object of the present invention to address at least the above-mentioned deficiencies and to provide at least the advantages which will be described hereinafter.

Another object of the present invention is to provide a high-speed corresponding injector, which is constructed in a gas passage that is coiled outside a metering valve and coiled on an injection end surface of the metering valve, and can form a fluid heat dissipation net outside the metering valve and on the injection end surface to form a heat insulation cover when gas passes through the gas passage, so as to form a cover type heat insulation and heat dissipation protection for the metering valve, and reduce high-temperature damage and high-temperature solving risk.

To achieve these objects and other advantages and in accordance with the purpose of the invention, the present invention provides an injection mechanism comprising: the metering valve is communicated with the liquid channel to supply the metering fluid;

wherein the gas channel comprises:

a winding section spirally wound along an outside of the metering valve and extending beyond a jetting direction;

a tapered spiral section which is coiled along the end face of the injection end of the metering valve and has a gradually reduced radius;

the coiling section is communicated with the tapered spiral section, the tapered spiral section is connected into the mixing chamber in a mode of being tangent to the inner wall of the mixing chamber, gas is input into the coiling section, enters the tapered spiral section after being spirally coiled outside the metering valve and then enters the mixing chamber, and therefore the fluid heat dissipation cover is formed on the outer portion of the metering valve and the end face of the spraying end of the metering valve.

According to the technical scheme, the fluid heat dissipation and heat insulation protective cover covering the outside and the injection end face of the metering valve can be constructed, and the influence of the inward transmission of external heat on the normal working operation of the core component of the metering valve is effectively prevented. And gas is input from the gas channel to the jet orifice to jet out fluid, the flow channel structure is of a spiral gradually-reduced structure on the whole, so that the flow channel structure has an excellent acceleration effect on the fluid, can promote the gas to flow, reduces dead angles of the gas channel, and avoids the phenomenon that the gas carrying heat is gathered at the dead angles and cannot be rapidly discharged.

Compared with a traditional multi-stage injection mechanism or a very long injection mechanism of a gas-liquid mixing channel, the atomizing mechanism with a simple structure is used for replacing a traditional injection valve, the structure is simpler, the volume is smaller, the number of the injection valves is reduced, the cost is reduced, the stroke from metering to mixed atomization spraying of the metering fluid is shortened, the response speed is improved, and when the atomizing mechanism is used for a fuel injection system of an engine, the injector has excellent atomizing performance, the fuel combustion efficiency of a combustion chamber can be improved, and the fuel economy is improved; when the catalyst is used for the exhaust pipe tail gas aftertreatment SCR system, the emission of unreacted urea is reduced, the crystallization risk is reduced, the conversion efficiency of the catalyst is improved, and the tail gas treatment effect can be finally improved.

Preferably, in the injection mechanism, an annular air chamber is constructed between the coiling section and the tapered spiral section, the air chamber has a structure with a wide upper part and a narrow lower part, the coiling section is cut into from the upper part of the air chamber, the lower part of the air chamber is provided with a plurality of diversion trenches, and the diversion trenches are connected to the tapered spiral section in a tangent mode.

Among the above-mentioned technical scheme, the gas that the section of coiling is accelerated enters into the air chamber through the dish, and rotatory acceleration in the air chamber, enters into the grooving through the air chamber lower part that narrows down, and rethread grooving enters into the convergent spiral section and further accelerates, reaches multiple acceleration effect, and the design of air chamber has increased the coverage area of fluid heat dissipation safety cover structure simultaneously.

Preferably, the indexing helix is connected to the mixing chamber by one or more cut-out slots.

Preferably, in the spraying mechanism, the atomizing structure comprises:

a: the liquid channel is communicated with the gas channel to indirectly spray the metering fluid into the mixing chamber, so that the metering fluid and the gas flow enter the mixing chamber together to rotate and accelerate and then are sprayed out from the spray port to form atomization; or

B: the liquid channel is communicated with the mixing chamber and directly sprays the metering fluid into the mixing chamber, so that the metering fluid is smashed and atomized by high-speed rotating airflow and then sprayed out from the spray opening to form secondary atomization; or

C: the mixing chamber is constructed with a throat structure which is narrowed first and then enlarged, so that the airflow is accelerated after rotating and then accelerated through the throat structure, the liquid channel is communicated with the throat structure to spray metering fluid, the metering fluid is torn and atomized by the high-speed airflow, and then the metering fluid is sprayed out from the spraying port to be atomized again.

In the technical scheme, the airflow cut into the mixing chamber is used for constructing a rotating mixing space for accelerating the fluid, the fluid to be atomized can selectively enter the rotating mixing space together with the airflow for acceleration, and then the fluid is sprayed out to form the spray with excellent atomization performance; the fluid to be atomized can also be directly sprayed into the rotating mixing space, the accelerated airflow cuts and atomizes, the rotating accelerated airflow can form vortex, a low-pressure area can be formed in the center of the vortex, the fluid spraying pressure difference can be increased, the fluid atomizing effect is further improved, and then the fluid is sprayed out to form spray with excellent atomizing performance; the fluid to be atomized can also be sprayed in a throat structure in the mixing chamber, the airflow is accelerated by rotation and then accelerated by the Laval throat structure, the sprayed fluid to be atomized is intensively cut and atomized, and finally, the atomized fluid is sprayed out to form the spray with excellent atomization performance.

Preferably, in the injection mechanism, the tapered spiral section is connected with an auxiliary flow channel, the auxiliary flow channel is connected to the throat structure of the mixing chamber in a tangent manner, the auxiliary flow channel intersects with the extension line of the liquid channel, and the intersection point is located at the throat structure, so that three streams of fluid of the auxiliary flow channel, the throat structure and the liquid channel collide.

In the technical scheme, the design of the auxiliary flow channel is added, so that three streams of fluid impact to improve the fluid atomization effect.

Preferably, in the injection mechanism, in the setting C, a splitter module having an arc surface or an inclined surface is fitted in the mixing chamber, a gap is provided between the arc surface or the inclined surface of the splitter module and the inner wall of the mixing chamber, and the gap forms a throat structure that is narrowed first and then enlarged.

Preferably, in the above-described ejection mechanism, the orifice diameter of the ejection port is smaller than the diameter or width of the mixing chamber, so that the space is constricted therein and the fluid is accelerated to be ejected.

Preferably, in the injection mechanism, the metering valve has a valve hole for metering fluid and a control member for controlling on/off of the valve hole, and the valve hole is communicated with the liquid passage to inject the metered fluid.

Preferably, in the above-described ejection mechanism, the liquid channel is opened in a single module, and the liquid channel is constructed by the single module; or the liquid channel is arranged in the modules and is formed by combining the modules.

Preferably, in the injection mechanism, a flow dividing module is arranged between the valve hole and the mixing chamber, and the liquid channel is communicated to the mixing chamber or the gas channel through the flow dividing hole of the flow dividing module; the shunt hole is provided singly or in plurality.

Preferably, in the injection mechanism, the vertical section of the mixing chamber is a cone with a large top and a small bottom, a hemispherical or spherical flow distribution module is arranged in the mixing chamber, the throat structure which is firstly contracted to be small and then expanded is formed between the outer wall of the flow distribution module and the inner wall of the mixing chamber to accelerate the airflow, and the flow distribution holes in the flow distribution module are arranged at the positions corresponding to the throat structure to inject the metered fluid.

Preferably, the injection mechanism specifically includes:

the gas mixing device comprises a mounting sleeve, a metering valve arranged on the mounting sleeve, a mixing chamber arranged at the spraying front end of the metering valve, a gas channel communicated to the mixing chamber from an external mounting sleeve, and a spraying port communicated with the mixing chamber; the valve hole of the metering valve is communicated to the mixing chamber or the gas channel through the liquid channel;

the metering valve is provided with a valve seat, a valve hole is formed in the valve seat, and the control component is matched with the valve hole to open and close the valve hole;

a fluid director module is arranged below the valve seat, the fluid director module is provided with a liquid channel and a flow dividing module, a throat which is firstly narrowed and then enlarged is formed between the outer wall of the flow dividing module and the inner wall of the mixing chamber, a flow dividing hole is formed in the throat of the flow dividing module, and the liquid channel communicates the valve hole with the flow dividing hole, so that metered fluid is sprayed out of the throat and is mixed with air flow;

the nozzle seat or the deflector module or both are provided with a concave cavity for constructing a mixing cavity and a deflector groove for constructing a gas channel, when the nozzle seat is mounted to the mounting sleeve, the nozzle seat is attached to the deflector module to construct the mixing cavity and the gas channel, and the ejection port is arranged on the nozzle seat;

the mounting sleeve, the metering valve, the flow guider module and the nozzle seat are assembled together to form the injection mechanism.

Preferably, the injection mechanism specifically includes:

the metering valve is provided with a valve sleeve, a valve hole is formed in the valve sleeve, and the control component is matched with the valve hole to open and close the valve hole;

the interlayer space or gap formed between the outer wall of the valve sleeve and the inner wall of the mounting sleeve forms the gas channel;

a hole sheet is arranged at one end of the valve hole in the spraying direction and is used as a flow dividing module, spray holes in the hole sheet are communicated with the valve hole, and an atomizing block is arranged below the hole sheet; the atomizing block or the pore sheet or both are provided with a concave cavity and a flow guide groove, and when the atomizing block is matched and installed on the installation sleeve, the atomizing block is attached to the pore sheet to form the mixing chamber and the gas channel;

the jet holes on the hole pieces are communicated to the mixing chamber, so that the metered fluid is jetted into the mixing chamber to be mixed with the gas; or the jet holes on the hole sheet are communicated with the gas channel, so that the metered fluid firstly enters the gas channel and then enters the mixing chamber together with the gas;

the spraying port is arranged on the atomizing block and communicated to the mixing chamber;

the mounting sleeve, the metering valve, the hole sheet and the atomizing block are assembled together to form the spraying mechanism.

The invention at least comprises the following beneficial effects:

the injection mechanism can construct the fluid heat dissipation and heat insulation protective cover covering the outside of the metering valve and the injection end face, and effectively prevents the normal working operation of the core component of the metering valve from being influenced by the inward transmission of external heat. And gas is input from the gas channel to the jet orifice to jet out fluid, the flow channel structure is of a spiral gradually-reduced structure on the whole, so that the flow channel structure has an excellent acceleration effect on the fluid, can promote the gas to flow, reduces dead angles of the gas channel, and avoids the phenomenon that the gas carrying heat is gathered at the dead angles and cannot be rapidly discharged.

Compared with a traditional multi-stage injection mechanism or a very long injection mechanism of a gas-liquid mixing channel, the atomizing mechanism with a simple structure is used for replacing a traditional injection valve, the structure is simpler, the volume is smaller, the number of the injection valves is reduced, the cost is reduced, the stroke from metering to mixed atomization spraying of the metering fluid is shortened, the response speed is improved, and when the atomizing mechanism is used for a fuel injection system of an engine, the injector has excellent atomizing performance, the fuel combustion efficiency of a combustion chamber can be improved, and the fuel economy is improved; when the catalyst is used for an exhaust pipe tail gas aftertreatment SCR system, the emission of unreacted urea is reduced, the crystallization risk is reduced, the conversion efficiency of a catalyst is improved, and the tail gas treatment effect is finally improved.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural view of a first embodiment of an atomizing structure according to the present invention;

FIG. 2 is a schematic structural view of a first embodiment of a mixing chamber according to the present invention;

fig. 3 is a schematic structural diagram of a first embodiment of a flow distribution module according to the present invention;

FIG. 4 is a schematic structural view of a first embodiment of the injection mechanism according to the present invention;

FIG. 5 is a schematic structural view of a second embodiment of the atomization structure of the present invention

Fig. 6 is a schematic structural diagram of a second embodiment of the shunt module according to the present invention;

FIG. 7 is a schematic structural view of a second embodiment of the injection mechanism according to the present invention;

FIG. 8 is a schematic structural view of a third embodiment of an atomizing structure according to the present invention;

fig. 9 is a schematic structural diagram of a third embodiment of the shunt module according to the present invention;

FIG. 10 is a schematic structural view of a third embodiment of the injection mechanism according to the present invention;

FIG. 11 is a partial schematic structural view of an atomizing structure portion of a fourth embodiment of a spray mechanism according to the present invention;

FIG. 12 is a schematic structural view of a splitter module portion of a fourth embodiment of an injection mechanism according to the present invention;

fig. 13 is a schematic plan view of a nozzle holder portion of a fourth embodiment of the injection mechanism according to the present invention.

In the figure, an atomizing structure 1, a metering valve 2, a control part 3, a fluid inlet 4, a valve 11, an orifice plate 12, a metering hole 1201, an atomizing block 13, a flow guide groove 1301, a rotating chamber 1302, an atomizing hole 1303, a mounting sleeve 14, a valve sleeve 15, a valve ball 16, a valve hole 17, a gas channel 18, a coiled section 1801, a tapered spiral section 1802, a gas chamber 1803, a cut-in groove 1804, a spiral groove 1805, a cut-out groove 1806, an auxiliary flow passage 1807, an inner mounting sleeve 31, a steel ball 32, a valve seat 33, a 330inclined surface 1, an extended section 3302 of the valve hole, a liquid flow guider 34, a liquid introducing hole 3401, a liquid guiding hole 3402, a hemisphere 3403, a gas flow guider 35, a gas introducing groove 3501, a gas guiding groove 3502, a rotation accelerating chamber 3503, a nozzle seat 36, a conical hole wall 3601, an auxiliary flow passage jet hole 3602, an auxiliary flow passage inlet 3603, a sleeve 37 and a valve hole 38.

Detailed Description

The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "disposed" are to be construed broadly, e.g., as meaning fixedly connected, disposed, detachably connected, disposed, or integrally connected and disposed. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

As shown in fig. 1 to 10, a description will first be made of an atomizing structure of the present invention, which includes: the device comprises a mixing chamber, a liquid channel for directly or indirectly spraying metering fluid into the mixing chamber, a gas channel for inputting gas flow into the mixing chamber, and an ejection port communicated with the mixing chamber;

the gas channel is connected into the mixing chamber in a tangential manner with the inner wall of the mixing chamber, so that the mixing chamber forms a rotary mixing space;

wherein, the device also comprises any one or a plurality of combination settings of the following A, B, C;

a: the liquid channel is communicated with the gas channel to indirectly spray the metering fluid into the mixing chamber, so that the metering fluid and the gas flow enter the mixing chamber together to rotate and accelerate and then are sprayed out from the spray port to form atomization;

b: the liquid channel is communicated with the mixing chamber and directly sprays the metering fluid into the mixing chamber, so that the metering fluid is smashed and atomized by high-speed rotating airflow and then sprayed out from the spray opening to form secondary atomization;

c: the mixing chamber is constructed with a throat structure which is contracted and expanded firstly, so that the airflow is accelerated after rotating and then accelerated through the throat structure, the liquid channel is communicated with the throat structure to spray metering fluid, the metering fluid is torn and atomized by the high-speed airflow, and then the metering fluid is sprayed out from the spray opening and atomized again.

Specifically, referring to fig. 1 to 4, the mixing chamber is composed of a rotating chamber 1302 arranged on the atomizing block 13 and a hole plate 12 matched above the atomizing block, and the rotating chamber 1302 is covered by the hole plate, so that the structural design is convenient for processing, assembling and disassembling. The construction of the mixing chamber is not limited to the above structure, and the mixing chamber can also be arranged on the hole sheet, or the hole sheet and the atomizing block are both arranged and then matched to form the mixing chamber. In the structures shown in fig. 8 to 10, the mixing chamber is formed by a conical cavity opened in the nozzle holder 36, the liquid deflector 34 and the gas deflector 35, so that the mixing chamber can be formed by selecting corresponding modules or components according to needs, and is not limited to the above structure.

The liquid channel is used for spraying metered liquid into the mixing chamber, the structure shown in the figures 1-4 is an indirect spraying mode, namely the liquid channel is communicated with the gas channel, and then the gas and the liquid enter the mixing chamber together, so that the structure is an internal mixing type structure; in the structures shown in fig. 5-10, the liquid channel is directly connected to the mixing chamber, and the accelerated gases in the mixing chamber interact with each other, which is an external mixing structure. The liquid channel has various construction modes, in the structure shown in fig. 1 and 5, a valve hole and a valve pore passage 17 are arranged on the valve 11, the valve hole 17 is the liquid channel, at the moment, the liquid channel is provided for a single valve 11 module, in the structure shown in fig. 8, an extension section 3302 of the valve hole is arranged on the valve seat 33, a liquid flow guider 34 is also arranged at the same time, the extension section 3302 and the liquid introduction hole 3401 jointly form the liquid channel, at the moment, the liquid channel is constructed by a plurality of modules, and therefore, the liquid channel can be constructed as required in implementation and is not limited to the structure.

The purpose of the gas channel is to introduce gas into the mixing chamber, and simultaneously has a cooling function, in order to meet the requirement, the gas channel can be constructed into a plurality of forms such as a pore channel, a gap, an interlayer space, a channel and the like, in the structure shown in fig. 1 to 7, the gas channel is composed of a gap between the installation sleeve 14 and the valve sleeve 15 and a gap between the valve sleeve 15 and the atomizing block, in the structure shown in fig. 8 to 10, the gas channel is composed of an interlayer space formed by the sleeve 37 and the installation inner sleeve, a gap or a gas chamber formed by the sleeve 37 and the gas flow guider 35, and a gas introduction groove 3501 and a gas guide groove 3502 which are arranged on the gas flow guider 35. Therefore, the construction mode of the gas channel can be selected according to requirements during implementation.

In the embodiment, the airflow cut into the mixing chamber is used for constructing a rotating mixing space for accelerating the fluid, the fluid to be atomized can selectively enter the rotating mixing space together with the airflow for acceleration, and then the fluid is sprayed out to form the spray with excellent atomization performance; the fluid to be atomized can also be directly sprayed into the rotating mixing space, the accelerated airflow cuts and atomizes, the rotating accelerated airflow can form vortex, a low-pressure area can be formed in the center of the vortex, the fluid spraying pressure difference can be increased, the fluid atomizing effect is further improved, and then the fluid is sprayed out to form spray with excellent atomizing performance; the fluid to be atomized can also be sprayed in a throat structure in the mixing chamber, the airflow is accelerated by rotation and then accelerated by the Laval throat structure, the sprayed fluid to be atomized is intensively cut and atomized, and finally, the atomized fluid is sprayed out to form the spray with excellent atomization performance.

Further, in another embodiment, as shown in fig. 8 to 10, a mixing chamber C is provided with a flow dividing module having an arc surface or an inclined surface, a gap is provided between the arc surface or the inclined surface of the flow dividing module and the inner wall of the mixing chamber, and the gap forms a throat structure that is narrowed first and then enlarged. The hemisphere 3403 provides the cambered surface, and the hemisphere 3403 and the tapered hole wall 3601 of the mixing chamber form the throat structure which is firstly narrowed and then enlarged. Alternatively, the curved surface or the inclined surface may be provided as a part of the splitter module, may be provided independently, or may be provided as a part of another module. The hemispherical shape may be replaced with a diamond-shaped block or the like to construct the slope.

Further, in another embodiment, the orifice diameter of the ejection port is smaller than the diameter or width of the mixing chamber, so that the space is constricted there and the fluid is accelerated to be ejected. In the structure shown in fig. 1 and 5, the atomizing holes 1303 constitute the ejection ports, and the diameter of the atomizing holes 1303 is smaller than the diameter or width of the rotating chamber 1302.

As shown in fig. 1 to 10, on the basis of understanding the atomization structure, the injection mechanism of the present invention is described, and the injection mechanism includes: the atomizing structure 1 is positioned at the spraying front end of the metering valve, the atomizing structure 1 is provided with a mixing chamber, a liquid channel for directly or indirectly spraying metering fluid into the mixing chamber, a gas channel for inputting gas flow into the mixing chamber and an ejection hole communicated with the mixing chamber are arranged on the mixing chamber, and the metering valve 2 is communicated with the liquid channel to supply the metering fluid;

the gas channel includes:

a coil section 1801 spirally wound along the outside of the metering valve 2 and extending in the injection direction;

a tapered helical section 1802 that is coiled along an end face of a spray end of the metering valve and that gradually decreases in radius;

the spiral section 1801 is communicated with the tapered spiral section 1802, the tapered spiral section 1802 is connected into the mixing chamber in a tangential mode to the inner wall of the mixing chamber (namely, the rotation acceleration chamber 3503), gas is input into the spiral section 1801, enters the tapered spiral section 1802 after being spirally wound along the outside of the metering valve and then enters the mixing chamber, and therefore a fluid heat dissipation cover is formed on the periphery of the metering valve and the end face of the spraying end of the metering valve.

Specifically, referring to fig. 11, the metering valve is located in the inner mounting sleeve 31, a sleeve 37 is further arranged outside the inner mounting sleeve 31, a spiral winding groove body is formed in the outer wall of the inner mounting sleeve or the inner wall of the sleeve, or both the outer wall and the inner wall of the sleeve are formed in the spiral winding groove body, and after the inner mounting sleeve and the sleeve are assembled, the spiral winding groove body forms the winding section.

The front end of the metering valve is provided with a gas flow guider 35, a nozzle seat 36 is installed and matched at the front end of the gas flow guider, a tapered spiral groove 1805 is formed in the gas flow guider 35 or the nozzle seat 36, or both the gas flow guider 35 and the nozzle seat 36 are provided with tapered spiral grooves 1805, after the gas flow guider 35 and the nozzle seat 36 are installed and matched, the tapered spiral grooves 1805 form a tapered spiral section 1802, and the tapered spiral section 1802 is provided with at least one inlet to be connected into a mixing chamber.

The introduced gas is accelerated for the first time by the coiling section 1801, then enters the tapered spiral section 1802 for the second acceleration, then enters the mixing chamber for the third acceleration, then is accelerated for the fourth time by the throat structure constructed in the mixing chamber, and finally is sprayed out from the atomizing block 1303.

The fluid heat dissipation and heat insulation protective cover covering the outside of the metering valve and the injection end face can be constructed, and the influence of the inward transmission of external heat on the normal working operation of the core component of the metering valve is effectively prevented. And gas is input from the gas channel to the jet orifice to jet out fluid, the flow channel structure is of a spiral gradually-reduced structure on the whole, so that the flow channel structure has an excellent acceleration effect on the fluid, can promote the gas to flow, reduces dead angles of the gas channel, and avoids the phenomenon that the gas carrying heat is gathered at the dead angles and cannot be rapidly discharged.

Further, in another embodiment, as shown in fig. 11 to 13, an annular air chamber 1803 is constructed between the coiled segment 1801 and the tapered spiral segment 1802, the air chamber 1803 is a structure with a wide top and a narrow bottom, the coiled segment 1801 is cut into the air chamber 1803 from the upper part of the air chamber 1803, the lower part of the air chamber 1803 is provided with a plurality of cut-in grooves 1804, and the cut-in grooves 1804 are tangentially connected to the tapered spiral segment 1802.

Specifically, as shown in fig. 11 and 12, the lower end of the inner mounting sleeve 31 is provided with an inclined surface, the inner portion of the sleeve 37 is also provided with an inclined surface, and the nozzle holder 36 is also provided with a partial inclined surface, so that when the inner mounting sleeve 31, the sleeve 37 and the nozzle holder 36 are assembled and matched, the annular air chamber 1803 is formed.

In this embodiment, the gas accelerated by the winding section enters the air chamber 1803, and rotates and accelerates in the air chamber 1803, enters the slit 1804 through the narrowed lower part of the air chamber, and then enters the tapered spiral section 1802 for further acceleration through the slit 1804, so as to achieve multiple acceleration effects, and meanwhile, the design of the air chamber increases the coverage area of the fluid heat dissipation protection cover structure.

Further, in another embodiment, as shown in fig. 12, the tapered helical section 1802 is connected to the mixing chamber by one or more cut-out slots 1806. The configuration shown in fig. 12 is a plurality of cut-out grooves.

Further, in another embodiment, as shown in fig. 11 and 13, an auxiliary flow passage 1807 is connected to the tapered spiral section 1802, the auxiliary flow passage 1807 is tangentially connected to the throat structure of the mixing chamber, the auxiliary flow passage 1807 intersects with the extension line of the liquid guiding hole 3402 of the liquid channel, and the intersection point is located at the throat structure, so that three streams of the auxiliary flow passage 1807, the throat structure and the liquid guiding hole 3402 collide.

Specifically, as shown in fig. 11 to 13, the auxiliary flow passage 1807 is provided on the nozzle seat 36, an auxiliary flow passage inlet 3603 of the auxiliary flow passage 1807 is communicated with the tapered spiral groove 1805, and is preferably tangent to the tapered spiral groove 1805, so that the air flow in the tapered spiral groove 1805 partially enters the auxiliary flow passage 1807, and is then ejected to the mixing chamber through an auxiliary flow passage nozzle hole 3602 provided on the tapered hole wall 3601, and the auxiliary flow passage nozzle hole 3602 is preferably tangent to the tapered hole wall 3601.

The design of the auxiliary flow channel is added in the embodiment, so that the three streams of fluid impact to improve the fluid atomization effect.

Further, in another embodiment, the liquid channel is provided in a single module, and the liquid channel is constructed by the single module, or the liquid channel is provided in a plurality of modules, and the liquid channel is constructed by combining the plurality of modules.

Specifically, in the structure shown in fig. 1 and 5, a valve hole and a valve pore passage 17 are formed in the valve 11, the valve hole 17 is the liquid channel, and the liquid channel is provided by a single valve 11 module, in the structure shown in fig. 8, an extension section 3302 of the valve hole is formed in the valve seat 33, and a liquid flow guider 34 is further arranged, and the extension section 3302 and the liquid introduction hole 3401 jointly form the liquid channel, and the liquid channel is formed by a plurality of modules, so that the liquid channel can be formed as required in implementation without being limited to the above structure.

Further, in another embodiment, a flow dividing module is arranged between the valve hole and the mixing chamber, and the liquid channel is communicated to the mixing chamber or the gas channel through a flow dividing hole of the flow dividing module; the shunt hole is provided singly or in plurality.

Specifically, referring to fig. 1 to 7, the hole piece 12 as a flow dividing module may be configured as a structure with a plurality of metering holes 1201 shown in fig. 3, or may be configured as a structure with a single metering hole 1201 shown in fig. 6; referring to fig. 8 and 9, the liquid deflector 34 is a flow dividing module having a hemispherical shape 3403, and a plurality of liquid deflector holes 3402 are provided on the hemispherical shape 3403. The function of the flow dividing module is to lead the liquid to a set position, such as a gas channel or a mixing chamber, so that the structure and the shape of the flow dividing module can be adjusted according to needs, and the flow dividing module is not limited to the structure.

Further, in another embodiment, the vertical section of the mixing chamber is a cone with a large top and a small bottom, a hemispherical or spherical flow distribution module is arranged in the mixing chamber, the throat structure which is firstly contracted to be small and then expanded is formed between the outer wall of the flow distribution module and the inner wall of the mixing chamber to accelerate the airflow, and the flow distribution holes in the flow distribution module are arranged at the positions corresponding to the throat structure to spray metered fluid. As will be understood with reference to fig. 8-10, the mixing chamber is formed by a conical cavity opened in the nozzle holder 36, the liquid deflector 34 and the gas deflector 35, the conical cavity and a hemisphere 3403 cooperate to form the throat structure which is narrowed first and then enlarged, and the hemisphere is a part of the liquid deflector of the flow dividing module.

Further, in another embodiment, referring to fig. 8 to 10, the spraying mechanism specifically includes:

the gas mixing device comprises an inner mounting sleeve 31, a metering valve arranged on the mounting sleeve 31, a mixing chamber arranged at the spraying front end of the metering valve, a gas channel communicated to the mixing chamber from the outside of the inner mounting sleeve 31, and a spraying port communicated with the mixing chamber; the valve hole of the metering valve is communicated to the mixing chamber or the gas channel through the liquid channel;

the metering valve is provided with a valve seat 33, a valve hole 38 is arranged on the valve seat 33, and the control component 3 is matched with the valve hole 38 to open and close the valve hole 38 so as to complete the metering function of the metering valve;

a fluid director module is arranged below the valve seat 33, the fluid director module is provided with a liquid channel and a flow dividing module (a hemisphere 3403 is used as the flow dividing module), a throat which is firstly narrowed and then enlarged is formed between the outer wall of the flow dividing module and the inner wall of the mixing chamber, a flow dividing hole (namely a liquid flow guiding hole 3402) is formed in the throat of the flow dividing module, and the liquid channel communicates the valve hole with the flow dividing hole, so that metered fluid is sprayed out of the throat and is mixed with air flow;

the nozzle seat 36, the cavity which constructs the mixing chamber and the diversion trench which constructs the gas channel are set on the nozzle seat or the diversion module or both, when the nozzle seat is mounted to the mounting sleeve, the nozzle seat and the diversion module are jointed to construct and form the mixing chamber and the gas channel, and the ejection port is set on the nozzle seat 36;

the inner mounting sleeve 31, the metering valve, the flow director module and the nozzle seat are assembled together to form the jet mechanism.

In another embodiment, a sleeve 37 is fitted outside the inner mounting sleeve 31, with a sandwich space or gap between them forming part of the gas passage, and a nozzle holder is fitted over the end of the sleeve 37 and closes it.

Further, in another embodiment, as shown in fig. 1 to 7, the spraying mechanism specifically includes:

the gas mixing device comprises a mounting sleeve 14, a metering valve arranged on the mounting sleeve 14, a mixing chamber arranged at the spraying front end of the metering valve, a gas channel communicated to the mixing chamber from the outside of the mounting sleeve 14, and a spraying port communicated with the mixing chamber; the valve hole of the metering valve is communicated to the mixing chamber or the gas channel through the liquid channel;

the metering valve is provided with a valve sleeve 15, the valve 11 is arranged in the valve sleeve 15, the valve 11 is provided with a valve hole, and the control component is matched with the valve hole to open and close the valve hole;

the interlayer space or gap formed between the outer wall of the valve sleeve 15 and the inner wall of the mounting sleeve 14 forms the gas channel;

a hole sheet 12 is arranged at one end of the valve hole in the spraying direction, the hole sheet 12 serves as a flow dividing module, spray holes in the hole sheet 12 are communicated with the valve hole, and an atomizing block 13 is arranged below the hole sheet; the atomizing block 13 or the hole piece 12 or both are provided with a concave cavity and a diversion trench, and when the atomizing block 13 is installed on the installation sleeve 14 in a matching way, the atomizing block 13 is attached to the hole piece 12 to form the mixing chamber and the gas channel;

the spray holes on the hole pieces 12 are communicated to the mixing chamber, so that the metered fluid is sprayed into the mixing chamber to be mixed with the gas; or the jet holes on the hole sheet are communicated with the gas channel, so that the metered fluid firstly enters the gas channel and then enters the mixing chamber together with the gas;

the spray port is arranged on the atomizing block 13 and communicated to the mixing chamber;

the mounting sleeve 14, the metering valve, the hole plate 12 and the atomizing block 13 are assembled together to form the spray mechanism.

Further, in another embodiment, the valve hole and the ejection hole are arranged coaxially or spatially staggered in the axial direction. Specifically, the method includes but is not limited to:

1) the valve hole and the ejection port are coaxial, so that the ejection directions are positioned on the same straight line; 2) the valve hole is positioned on the axis, and the spray port deviates from the axis; 3) the valve hole deviates from the axis, and the spraying hole is on the axis; 4) the valve hole and the spray opening are not on the axis.

Further, in another embodiment, the flow guide groove includes, but is not limited to, a rectangle, an arc, a horn, a V-shape, or the like.

Example 1

As shown in fig. 1 to 4, the injector is a first embodiment of an injection mechanism including an atomizing structure, and the injector can be used in a fuel injection system of an engine and an exhaust pipe exhaust gas aftertreatment SCR injection system. When the fuel injection system is used in a fuel injection system, the fuel sprayed by the injector has excellent atomization performance, the combustion efficiency of the fuel in a combustion chamber can be improved, and the fuel economy is improved; in the exhaust pipe tail gas aftertreatment SCR system, the atomization effect of the urea solution is improved, the reaction speed of urea solution injection is improved, the emission of unreacted urea is reduced, and the conversion efficiency of a catalyst is improved.

The specific implementation structure is as follows: the valve 11, the valve 11 is installed on valve housing 15, the valve 11 has valve holes, the valve hole cooperates with valve ball 16, the valve ball 16 and control module (such as electromagnetic control module, coil control module, etc.) that controls its opening make up the said control unit together, set up the valve pore 17 in the valve 11 and connect with valve hole; the pore sheet 12 is used as a flow dividing module, a plurality of metering holes 1201 are formed in the pore sheet 12, the liquid channel is communicated with the metering holes 1201, and the pore sheet 12 is installed on the valve 11; the atomizing block 13 is provided with a gas channel, a mixing chamber and a spray port, which is more beneficial to production, processing and disassembly and assembly, the atomizing block 13 is arranged on the mounting sleeve 14, the upper end surface of the atomizing block 13 is provided with guide grooves 1301 uniformly distributed on the circumference, the guide grooves 1301 form a part of gas channel 18, the other part of gas channel 18 is formed by an interlayer space or a gap between the inner wall of the mounting sleeve 14 and the outer wall of the valve sleeve 15 and a gap between the atomizing block 13 and the valve sleeve 15, the gas channel can form a heat insulation barrier to separate heat outside and protect the components of the metering valve inside, the mounting sleeve 14 is provided with a gas inlet communicated with the gas channel 18, the circumference center of the atomizing block 13 is provided with a rotating chamber 1302, the rotating chamber 1302 forms the mixing chamber, the guide grooves 1301 are tangent to the rotating chamber 1302, the atomizing holes are arranged in the rotating chamber, 1303 atomizing holes 1303 form the spray port, when the metering valve starts to spray, liquid enters the metering valve from the fluid inlet 4, passes through a valve pore passage 17 of the valve 11, passes through the pore plate 12 serving as a flow dividing module, and then falls into the flow guide groove 1301 of the atomizing block 13, the metering holes 1201 on the pore plate 12 correspond to the gas flow guide groove 1301 in a one-to-one mode, the liquid is directly sprayed into the flow guide groove 1301, gas enters the flow guide groove 1301 and then is mixed with the liquid, and the liquid-gas mixed liquid is converged and accelerated to rotate in the rotating chamber 1302 as the gas flow guide groove 1301 is tangent to the rotating chamber 1302 and then is sprayed out from the atomizing holes 1303, so that spray with excellent atomizing performance is formed.

The effect of this embodiment is mainly reflected in: guiding gutter circumference evenly distributed, and tangent with the runing chamber, gas and liquid through can play effect with higher speed, and the runing chamber can form preliminary atomization again after mixing, and the atomizing hole blowout can be followed to the granule after later preliminary atomization, and because of the liquid gas in the runing chamber forms the big pressure differential with the air outside the atomizing hole, spun liquid gas can form the second time and atomize, finally forms the splendid spraying of atomizing performance.

This embodiment utilizes guiding gutter and the studio in the atomizing piece to mix gas and liquid and accelerate, forms preliminary atomization, sets up the atomizing hole at the studio bottom surface, utilizes pressure differential to form the secondary atomizing with liquid to obtain the spraying that the atomization performance is very good, and the structure is very compact, solves the poor problem of sprayer atomization performance, and fast-speed air current can clean spout debris in spout department simultaneously, effectively solves the failure mode that the sprayer blockked up. The high-speed airflow and the precisely metered liquid are sprayed out from the nozzle together, so that the excellent atomization effect is achieved, the high-speed response performance is achieved, and the requirement of the post-treatment system of the engine above six countries on the high-speed response of urea injection can be met.

Example 2

As shown in fig. 2, 5, 6 and 7, it is a second embodiment of an injection mechanism including an atomization structure, which can be used in a fuel injection system of an engine and an exhaust pipe exhaust aftertreatment SCR injection system to make an injector have excellent atomization performance; the injector is used in a fuel injection system, so that the fuel combustion efficiency of a combustion chamber can be improved, and the fuel economy is improved; in an exhaust pipe tail gas aftertreatment SCR system, the emission of unreacted urea is reduced, and the conversion efficiency of a catalytic converter is improved.

The main difference between this embodiment 2 and embodiment 1 is the design of the split module hole piece.

The specific implementation structure is as follows: the valve 11 and the valve 11 are installed on the valve housing 15, the valve 11 is provided with a valve hole, the valve hole is matched with a valve ball 16, the valve ball 16 and a control module (such as an electromagnetic control module, a coil control module and the like) for controlling the valve ball to open jointly form the control component, and a liquid channel is arranged in the valve 11 and connected with the valve hole.

The hole plate 12 is used as a flow dividing module, a single metering hole 1201 is arranged on the hole plate 12, the metering hole 1201 is communicated with a mixing cavity instead of a gas channel, the hole plate 12 is arranged on the valve 11, and the valve hole is communicated to the metering hole 1201.

The atomizing block 13 is provided with a gas channel, a mixing chamber and a spray port, which is more beneficial to production, processing and disassembly and assembly, the atomizing block 13 is installed on the installation sleeve 14, the upper end surface of the atomizing block 13 is provided with guide grooves 1301 uniformly distributed on the circumference, the guide grooves 1301 form a part of gas channel 18, the other part of gas channel 18 is formed by an interlayer space or a gap between the inner wall of the installation sleeve 14 and the outer wall of the valve sleeve 15 and a gap between the atomizing block 13 and the valve sleeve 15, the gas channel can form a heat insulation barrier to separate heat outside and protect the components of the metering valve inside, the installation sleeve 14 is provided with a gas inlet communicated to the gas channel 18, the circumference center of the atomizing block 13 is provided with a rotating chamber 1302, the rotating chamber 1302 forms the mixing chamber, the guide grooves 1301 are tangent to the rotating chamber 1302, the rotating chamber is provided with atomizing holes, and the 1303 atomizing holes 1303 form the spray port.

When the metering valve starts to spray, liquid passes through the valve, passes through the hole piece and then falls into the rotating chamber 1302 of the atomizing block 13, gas enters from the gas guide groove 1301, the gas is converged and accelerated to rotate in the rotating chamber 1302 due to the fact that the gas guide groove 1301 is tangent to the rotating chamber 1302, the liquid is sprayed into the rotating chamber 1302, the liquid can be smashed by the rotating gas, and then the liquid is sprayed out from the atomizing holes 1303, and the spray with excellent atomizing performance is formed.

The embodiment has the characteristics that: gaseous guiding gutter circumference evenly distributed, and tangent with the rotatory room, the effect with higher speed can be played to the gas of passing through, precision measurement's liquid falls in the rotatory room this moment, high-speed rotatory gas can smash liquid, form primary atomization, the particle after the primary atomization can be followed the atomizing hole blowout, because of the liquid gas in the rotatory room and the outer air formation of atomizing hole have big pressure differential, spun liquid gas can form the secondary atomization, finally form the splendid spraying of atomization performance.

This embodiment utilizes gaseous guiding gutter and the runing chamber in the atomizing piece to accelerate gas, and the liquid of precision measurement falls in rotatoryly, smashes it with high-speed gas, forms preliminary atomization, the terminal surface sets up the atomizing hole under the runing chamber, utilizes pressure differential to form the secondary atomization with liquid, in order to obtain the spraying that the atomization performance is very good, and the structure is very compact, solves the poor problem of sprayer atomization performance, and the fast-speed air current can clean spout debris in spout department simultaneously, effectively solves the failure mode that the sprayer blockked up. The high-speed airflow and the precisely metered liquid are sprayed out from the nozzle together, so that the excellent atomization effect is achieved, the high-speed response performance is achieved, and the requirement of the post-treatment system of the engine above six countries on the high-speed response of urea injection can be met.

Example 3

As shown in fig. 8, 9 and 10, the third embodiment of the injection mechanism includes an atomizing structure, which can be used in a fuel injection system of an engine and an exhaust pipe exhaust aftertreatment SCR injection system to provide an injector with excellent atomizing performance; in the fuel injection system, the combustion efficiency of fuel in the combustion chamber can be improved, and the fuel economy is improved; in an exhaust pipe tail gas aftertreatment SCR system, the emission of unreacted urea is reduced, and the conversion efficiency of a catalytic converter is improved.

The main structure of this embodiment: the valve seat 33 of the metering valve is arranged in the inner mounting sleeve 31, the steel ball 32 is attached to the inclined surface 3301 of the valve seat 33, when the steel ball 32 is lifted, liquid flows through a gap between the steel ball 32 and the inclined surface 3301 and then flows to the liquid flow guider 34 through the valve hole 38 and the extension section 3302 of the valve hole, the liquid flow guider 34 takes the function of a flow dividing module, the liquid flow guider 34 is arranged in the gas flow guider 35, the liquid flow guider 34 and the gas flow guider 35 are assembled together to form a flow guider module, a liquid introducing hole 3401 and a liquid guiding hole 3402 are formed in the liquid flow guider 34, the liquid flows to the liquid guiding hole 3402 through the liquid introducing hole 3401, and the liquid of the liquid flow guider is distributed to the conical hole 3601 of the nozzle seat 36 through the liquid guiding hole 3402. The nozzle holder 36 is mounted on the gas deflector 35. The gas guiding device 35 is provided with a gas introducing groove 3501 and a gas guiding groove 3502, gas enters the gas guiding groove 3502 from the gas introducing groove 3501, the gas is converged in the plurality of gas guiding grooves 3502 to the middle rotation accelerating chamber 3503, the rotation accelerating chamber 3503 is a cylindrical groove, the gas guiding groove 3502 is tangent to the rotation accelerating chamber 3503, the nozzle holder 36 is installed on the sleeve 37, the sleeve 37 is provided with a gas inlet, a gas channel is formed between the inner wall of the sleeve 37 and the outer wall of the inner installation sleeve 31, a gas channel is also formed between the inner wall of the sleeve 37 and the outer wall of the gas guiding device 35, and the nozzle holder 36 is attached to the gas guiding groove 3502 and the rotation accelerating chamber 3503 to form a complete gas guiding channel and an accelerating space. The gas rotation acceleration chamber 3503 has an acceleration effect. The outer side of a liquid guide hole 3402 of the liquid guide device 34 is a hemisphere 3403, a throat pipe structure which has an accelerating effect and is narrowed in cross section first and then expanded is constructed by utilizing the cambered surface of the hemisphere 3403 and a conical hole wall 3601 of the nozzle seat 36, liquid comes out from the liquid guide hole 3402 and then comes to the conical hole wall 3601 of the nozzle seat 36, gas accelerated in a rotary accelerating chamber 3501 is mixed with the liquid at the conical hole wall 3601 of the nozzle seat 36, the gas and the liquid are accelerated simultaneously in the mixing process, meanwhile, the high-speed gas can tear the liquid into countless small particles, and finally the small particles are sprayed out from a spraying port to the outside to form spray with excellent atomizing performance.

The embodiment is characterized in that: the gas guide device is provided with a gas introduction groove, a gas guide groove and a rotating chamber, the gas forms acceleration in the gas guide device, the liquid guide device is provided with a liquid introduction hole, a liquid guide hole and a hemispherical outer wall outside the liquid guide hole, the nozzle seat is provided with a conical hole wall, the conical hole wall and the hemispherical outer wall outside the liquid guide hole form a throat pipe with the sectional area reduced and then enlarged, the liquid enters the throat pipe through the liquid guide device, and the accelerated gas and the accelerated liquid are torn at the throat pipe together in an accelerated manner to form spray with excellent atomization performance.

In the embodiment, the gas under certain pressure has certain speed, the gas can form very high-speed airflow after being accelerated again by the gas flow guider, the throat pipe with the reduced sectional area and the expanded sectional area can also play an accelerating effect, the liquid comes to the throat pipe through the liquid flow guider to meet and collide with the high-speed airflow to form secondary acceleration, the spray with good atomization performance can be formed, the structure is compact, the problem of poor atomization performance of the oil sprayer is solved, meanwhile, impurities on a nozzle can be cleaned by the high-speed airflow at the nozzle, and the fault mode of blockage of the oil sprayer is effectively solved. The high-speed airflow and the precisely metered liquid are sprayed out from the nozzle together, so that the excellent atomization effect is achieved, the high-speed response performance is achieved, and the requirement of the post-treatment system of the engine above six countries on the high-speed response of urea injection can be met.

Example 4

Referring to fig. 11, 12 and 13, a fourth embodiment of the injection mechanism including an atomizing structure is shown, in which the metering valve is located in the inner mounting sleeve 31, a sleeve 37 is further disposed outside the inner mounting sleeve 31, a spiral winding groove body is formed on an outer wall of the inner mounting sleeve or an inner wall of the sleeve, or both the outer wall and the inner wall of the sleeve are provided with spiral winding groove bodies, and after the inner mounting sleeve and the sleeve are assembled, the spiral winding groove bodies form the winding section.

An annular air chamber 1803 is constructed between the coiled section 1801 and the tapered spiral section 1802, the air chamber 1803 is of a structure with a wide upper part and a narrow lower part, the coiled section 1801 is cut into the air chamber 1803 from the upper part of the air chamber 1803, a plurality of cut-in grooves 1804 are arranged at the lower part of the air chamber 1803, and the cut-in grooves 1804 are tangentially connected into the tapered spiral section 1802.

Specifically, the lower end of the inner mounting sleeve 31 is provided with an inclined surface, the inner portion of the sleeve 37 is also provided with an inclined surface, and the nozzle holder 36 is also provided with a partial inclined surface, so that the inner mounting sleeve 31, the sleeve 37 and the nozzle holder 36 are assembled and matched to form the annular air chamber 1803.

The gas accelerated by the coiling section enters the gas chamber 1803, rotates and accelerates in the gas chamber 1803, enters the cut-in groove 1804 through the narrowed lower part of the gas chamber, and then enters the tapered spiral section 1802 through the cut-in groove 1804 to further accelerate, so that the multiple acceleration effect is achieved, and meanwhile, the covering area of the fluid heat dissipation protection cover structure is increased due to the design of the gas chamber.

As shown in fig. 12, the tapered helical section 1802 is connected to the mixing chamber by a plurality of cut-out slots 1806. The structure in the figure is a plurality of cut-out grooves.

As shown in fig. 11 and 13, an auxiliary flow passage 1807 is connected to the tapered spiral section 1802, the auxiliary flow passage 1807 is tangentially connected to the throat structure of the mixing chamber, the auxiliary flow passage 1807 intersects with an extension line of the liquid guiding hole 3402 of the liquid channel, and the intersection point is located at the throat structure, so that three streams of the auxiliary flow passage 1807, the throat structure and the liquid guiding hole 3402 collide.

As shown in fig. 11 to 13, the auxiliary flow passage 1807 is disposed on the nozzle holder 36, an auxiliary flow passage inlet 3603 of the auxiliary flow passage 1807 is communicated with the tapered spiral groove 1805, and is preferably tangent to the tapered spiral groove 1805, so that the air flow in the tapered spiral groove 1805 partially enters the auxiliary flow passage 1807, and is then ejected to the mixing chamber through an auxiliary flow passage nozzle hole 3602 disposed on the tapered hole wall 3601, and the auxiliary flow passage nozzle hole 3602 is preferably tangent to the tapered hole wall 3601.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art.

Claims

1. An injection mechanism, comprising: the metering valve is communicated with the liquid channel to supply the metering fluid;

wherein the gas channel comprises:

2. The ejector mechanism of claim 1, wherein an annular air chamber is formed between the spiral section and the tapered spiral section, the air chamber has a structure that is wide at the top and narrow at the bottom, the spiral section is cut into the air chamber from the upper part, and a plurality of guide grooves are formed in the lower part of the air chamber and tangentially connected to the tapered spiral section.

3. The ejector mechanism of claim 2, wherein in said atomizing structure:

4. The ejector mechanism of claim 3, wherein the tapered spiral section is connected to an auxiliary flow channel, the auxiliary flow channel is tangentially connected to the throat structure of the mixing chamber, the auxiliary flow channel intersects an extension of the liquid channel, and the intersection point is located at the throat structure, such that three streams of the auxiliary flow channel, the throat structure and the liquid channel impinge.

5. The injection mechanism as claimed in claim 3, wherein in the setting C, a flow dividing module with an arc surface or an inclined surface is matched in the mixing chamber, a gap is formed between the arc surface or the inclined surface of the flow dividing module and the inner wall of the mixing chamber, and the gap forms a throat structure which is narrowed first and then enlarged.

6. The ejector mechanism of claim 3, wherein the orifice diameter of said ejection port is smaller than the diameter or width of the mixing chamber, so that the space is constricted there and the fluid is accelerated to eject.

7. An injector mechanism as claimed in claim 3 wherein said metering valve has a valve orifice for metering fluid and control means for controlling the opening and closing of the valve orifice, the valve orifice being connected to said liquid passage for injecting the metered fluid.

8. The ejector mechanism of claim 7, wherein said liquid channel opens in a single module, said liquid channel being constructed from a single module; or the liquid channel is arranged in the modules and is formed by combining the modules.

9. The injection mechanism as claimed in claim 8, wherein a flow dividing module is arranged between the valve hole and the mixing chamber, and the liquid channel is communicated to the mixing chamber or the gas channel through the flow dividing hole of the flow dividing module; the shunt hole is provided singly or in plurality.

10. The ejector mechanism according to claim 9, wherein the mixing chamber has a tapered vertical cross-section with a large top and a small bottom, a hemispherical or spherical splitter module is disposed in the mixing chamber, the throat structure that is enlarged after being reduced is formed between the outer wall of the splitter module and the inner wall of the mixing chamber to accelerate the airflow, and the splitter holes of the splitter module are disposed at positions corresponding to the throat structure to eject the metered fluid.