CN110801948A - Nozzle with torsional 8-shaped spray hole - Google Patents
Nozzle with torsional 8-shaped spray hole Download PDFInfo
- Publication number
- CN110801948A CN110801948A CN201810881594.XA CN201810881594A CN110801948A CN 110801948 A CN110801948 A CN 110801948A CN 201810881594 A CN201810881594 A CN 201810881594A CN 110801948 A CN110801948 A CN 110801948A
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- Prior art keywords
- shaped
- nozzle
- spray
- spray hole
- hole
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/02—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to produce a jet, spray, or other discharge of particular shape or nature, e.g. in single drops, or having an outlet of particular shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/18—Injection nozzles, e.g. having valve seats; Details of valve member seated ends, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Nozzles (AREA)
Abstract
The invention provides a nozzle with a torsional 8-shaped spray hole. The invention comprises a nozzle body and one or more jet holes arranged on the nozzle body, wherein the cross section of at least one jet hole is 8-shaped, the long axis of the 8-shaped cross section rotates along the axis of the jet hole from the inlet of the jet hole to the outlet of the jet hole, and the aspect ratio of the 8-shaped cross section is variable along the axis of the jet hole. The invention can form strong turbulence disturbance in the spray orifice to promote jet flow diffusion and mixing, and adopts the design of variable 8-shaped length-width ratio, so that the spray orifice has good pressure maintaining performance and cavitation characteristic, and jet flow mixing and diffusion are further improved. Meanwhile, the 8-shaped middle slit can enhance the interference effect of the fluid in the two similar circular pore passages, and further enhance the spray disturbance and the crushing. The numerical calculation shows that the spray particle average diameter can be reduced by 15%, the engine thermal efficiency can be improved by 2.5%, and the particulate matter emission can be reduced by 25% when the spray particle average diameter is reduced by the invention and the spray particle average diameter is reduced by 15% under the same injection pressure.
Description
Technical Field
The invention relates to the technical field of fluid injection, in particular to a nozzle with a torsional 8-shaped spray hole.
Background
In the application practices in various fields such as industry, agriculture, medical health, national defense science and technology and the like, the fluid injection technology is involved, and the fluid is injected by using a nozzle under certain pressure so as to achieve respective purposes. For example, in the field of internal combustion engines, when liquid fuel is used, a certain amount of liquid fuel needs to be injected into an air inlet pipeline or a cylinder through a pressure nozzle in a very short time to form spray so that the fuel and air can be quickly and fully mixed and combusted, and the nozzle is used as a carrier for implementing injection, so that the spray characteristic of the liquid fuel is greatly influenced, and further the combustion and emission characteristics of the internal combustion engine are influenced.
In fluid nozzles, it is generally necessary to provide orifices whose geometry and size have a significant influence on the injection behavior. Most currently used are orifices having a circular cross-section, such as cylindrical orifices, conical orifices, including tapered conical and diverging conical orifices.
It is well known that the internal geometry of a fluid nozzle affects its internal flow field characteristics. As in the field of internal combustion engines, the internal geometry of a liquid fuel nozzle affects its cavitation bubble generation characteristics, pressure and velocity distribution characteristics, and thus, the spray characteristics of the liquid fuel. Improving fluid ejection characteristics through innovative designs of internal geometries of fluid ejection nozzles is an important technical approach. The cross section of the twisted 8-shaped spray hole provided by the invention can effectively improve internal turbulence after being twisted along the axis of the spray hole, and the 8-shaped middle slit can enhance the fluid interference effect of two similar circular pore passages, further strengthen disturbance and promote spray jet and mixing.
Disclosure of Invention
In view of the above-mentioned technical problems, a nozzle with twisted 8-shaped orifices is provided. The invention enables the generation of suitable internal turbulence disturbances, thereby further improving the liquid spray characteristics. If the nozzle is applied to an internal combustion engine, appropriate cavitation bubbles and speed distribution characteristics can be generated in the nozzle, and then the spray mixed gas forming and combustion performance of the engine are improved.
The technical means adopted by the invention are as follows:
a nozzle with twisted 8-shaped spray holes comprises a nozzle body and one or more spray holes arranged on the nozzle body, wherein the cross section of at least one spray hole is 8-shaped, the long axis of the 8-shaped cross section rotates along the axis of the spray hole from the inlet to the outlet of the spray hole, and the 8-shaped length-width ratio can be changed along the axis of the spray hole.
Further, the twisting direction of the figure 8 is clockwise or counterclockwise.
Further, the area of the 8-shaped spray hole from the inlet to the outlet is kept constant, and the area is reduced firstly and then increased, gradually reduced and increased secondly and reduced firstly.
Further, the longitudinal section of the nozzle hole has any one of a rectangular shape, a tapered shape, a divergent shape, a convergent-divergent shape, and a divergent-convergent shape.
Further, the nozzle is processed by adopting a die forming or 3D printing technology.
The invention is suitable for the field of liquid or gas injection by adopting various devices such as nozzles, spray heads or ejectors. Compared with the prior art, the invention can strengthen turbulence disturbance inside the spray hole of the nozzle, and can improve the generation and the velocity distribution of cavitation bubbles inside the nozzle under the liquid spraying condition, thereby leading the nozzle to obtain better spraying and mixing characteristics. If the fuel nozzle is applied to a direct injection diesel engine, the average diameter of spray particles can be reduced by 15 percent under the same injection pressure, the thermal efficiency of the engine is improved by 2.5 percent, and the emission of particulate matters is reduced by 25 percent.
For the above reasons, the present invention can be widely applied to the field of fluid ejection technology.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a two-dimensional structure with equal-area twisted 8-shaped orifices according to an embodiment of the present invention.
FIG. 2 is a schematic view of a fluid ejection nozzle body and orifice of the present invention.
Fig. 3 is a schematic diagram of a two-dimensional structure with a tapered and gradually expanding twisted 8-shaped nozzle hole according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a two-dimensional structure with a gradually expanding twisted 8-shaped nozzle hole according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a two-dimensional structure with tapered twisted 8-shaped orifices according to an embodiment of the present invention.
Fig. 6 is a schematic two-dimensional structure diagram of a twisted 8-shaped orifice with a gradually expanding and contracting shape according to an embodiment of the present invention.
In the figure: 1. a nozzle body; 2. 3, 6, 9, 12, 15 and 8-shaped cross-section spray holes; 4. 7, 10, 13, 16, 8-shaped cross section spray orifice inlets; 5. 8, 11, 14, 17, 8-shaped cross section spray orifice outlet.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in figure 2, the invention provides a nozzle with a twisted 8-shaped spray hole, a nozzle body 1 and one or more spray holes 2 arranged on the nozzle body, wherein the cross section of at least one spray hole is 8-shaped, the long axis of the 8-shaped cross section rotates along the axis of the spray hole from the inlet to the outlet of the spray hole, and the aspect ratio of the 8 shape is variable along the axis of the spray hole.
The twisting direction of the figure 8 is clockwise direction or anticlockwise direction.
The area of the 8-shaped spray hole from the inlet to the outlet is kept constant, and the area is reduced firstly and then increased, gradually reduced and increased firstly and then reduced.
The longitudinal section of the spray hole is in any one of a rectangular shape, a tapered shape, a gradually expanding shape, a tapered-gradually expanding shape and a tapered-gradually contracting shape.
The nozzle is processed by adopting a mold forming or 3D printing technology.
Example 1
As shown in fig. 1, the cross-sectional area of the nozzle hole is 8-shaped, in this embodiment, the cross-sectional area and the aspect ratio of the inlet 4 to the outlet 5 of the nozzle hole 3 are consistent, the longitudinal sectional shape is a straight cylinder, and the 8-shaped is twisted clockwise by 360 °. Compared with a circular straight hole, the torsion type design is adopted to enhance disturbance and promote spray crushing and mixing, and the 8-shaped middle slit can enhance fluid interference in two similar circular pore channels and enhance disturbance.
Example 2
As shown in fig. 3, in this example, the areas and shapes of the inlet 7 and the outlet 8 of the nozzle hole 6 are completely consistent, but the cross section and the longitudinal section are tapered and gradually expanded in the middle process, so that the speed and the turbulence intensity of the injection can be further improved, and the 8-shaped part is twisted by 360 degrees anticlockwise.
Example 3
As shown in fig. 4. In the embodiment, the inlet 10 of the spray hole 9 is smaller than the outlet 11, the middle section of the spray hole 9 is of a divergent structure, the 8-shaped part is twisted clockwise by 360 degrees, and the divergent structure can increase the number of cavitation bubbles, thereby being beneficial to spray crushing.
Example 4
As shown in fig. 5. In the present embodiment, the inlet 13 of the nozzle hole 12 is larger than the outlet 14, and the whole body has a tapered structure, and the 8-shaped part is twisted clockwise by 360 °.
Example 5
As shown in fig. 6. In the present embodiment, the area and shape of the inlet 16 and the outlet 17 of the spray hole 15 are completely consistent, the cross section and the longitudinal section of the middle section adopt a gradually expanding and reducing type, and the 8-shaped is twisted by 360 degrees in a counterclockwise direction.
The above examples are only partial structural schematic diagrams, and the aspect ratio variation, the cross-sectional area variation, the longitudinal section structural style and the torsion angle of the figure 8 can be combined freely.
Compared with a circular straight hole, the spray hole has the characteristic that the torsion type 8-shaped spray hole enhances internal turbulence disturbance, and the 8-shaped middle slit can enhance the fluid interference effect between two similar circular pore channels and enhance disturbance; and the jet orifice has a tapered-divergent structure, so that the jet orifice has a strong pressure maintaining effect caused by the tapered jet orifice structure, the total energy of fuel oil at the outlet of the jet orifice is increased, and the jet orifice has the characteristic of large quantity of cavitation bubbles at the outlet of the divergent jet orifice. The structure improves the total energy of the outlet of the spray hole, increases the number density of cavitation bubbles, and further promotes the atomization and mixing of the fuel jet by the collapse of the bubbles. The numerical calculation shows that the spray particle average diameter can be reduced by 15%, the engine thermal efficiency can be improved by 2.5%, and the particulate matter emission can be reduced by 25% when the spray particle average diameter is reduced by the invention and the spray particle average diameter is reduced by 15% under the same injection pressure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A nozzle with twisted 8-shaped spray holes comprises a nozzle body, wherein one or more spray holes are formed in the nozzle body, the cross section of at least one spray hole is 8-shaped, the long axis of the 8-shaped cross section rotates along the axis of the spray hole from the inlet to the outlet of the spray hole, and the 8-shaped length-width ratio can be changed along the axis of the spray hole.
2. The twisted 8-orifice nozzle of claim 1, wherein the twist direction of the 8-shape is clockwise or counterclockwise.
3. The nozzle with twisted 8-shaped orifices according to claim 1 or 2, wherein the area of the 8-shaped orifices from the inlet to the outlet is constant, and is any one of decreasing, increasing, gradually decreasing and increasing and decreasing.
4. The nozzle with twisted 8-shaped orifices according to claim 1 or 2, wherein the longitudinal cross-sectional shape of the orifice is any one of a rectangle, a tapered type, a divergent type, a convergent-divergent type, and a divergent-divergent type.
5. The nozzle with the twisted 8-shaped spray hole according to any one of claim 1, wherein the nozzle is processed by die forming or 3D printing technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810881594.XA CN110801948A (en) | 2018-08-05 | 2018-08-05 | Nozzle with torsional 8-shaped spray hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810881594.XA CN110801948A (en) | 2018-08-05 | 2018-08-05 | Nozzle with torsional 8-shaped spray hole |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110801948A true CN110801948A (en) | 2020-02-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810881594.XA Pending CN110801948A (en) | 2018-08-05 | 2018-08-05 | Nozzle with torsional 8-shaped spray hole |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110801948A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682408A (en) * | 2020-12-31 | 2022-07-01 | 大连理工大学 | Internal rotational flow cross hole double-gas-assisted injector |
| CN115350826A (en) * | 2022-08-22 | 2022-11-18 | 中国铁建重工集团股份有限公司 | Rotary spraying device |
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| SU1025860A1 (en) * | 1982-02-25 | 1983-06-30 | Производственное Объединение "Мангышлакнефть" | Hydraulic monitor nozzle for drilling bit |
| WO2004037336A2 (en) * | 2002-10-09 | 2004-05-06 | Amersham Health As | Tube with non-circular internal cross-section |
| WO2007100857A2 (en) * | 2006-02-28 | 2007-09-07 | Vortexx Group, Inc. | Nozzle that produce angular momentum and methods for making and using same |
| CN102165258A (en) * | 2008-09-29 | 2011-08-24 | 西门子公司 | Fuel nozzle |
| CN102235283A (en) * | 2010-02-04 | 2011-11-09 | 大连理工大学 | Fuel nozzle |
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2018
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| WO2007100857A2 (en) * | 2006-02-28 | 2007-09-07 | Vortexx Group, Inc. | Nozzle that produce angular momentum and methods for making and using same |
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| CN103459824A (en) * | 2011-02-02 | 2013-12-18 | 3M创新有限公司 | Nozzle and method of making same |
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| CN203508236U (en) * | 2013-07-09 | 2014-04-02 | 王浦勋 | Pre-rotation cavitation jet flow nozzle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114682408A (en) * | 2020-12-31 | 2022-07-01 | 大连理工大学 | Internal rotational flow cross hole double-gas-assisted injector |
| CN115350826A (en) * | 2022-08-22 | 2022-11-18 | 中国铁建重工集团股份有限公司 | Rotary spraying device |
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| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200218 |
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| RJ01 | Rejection of invention patent application after publication |