CN110801954A - Nozzle with partially twisted 8-shaped spray holes - Google Patents
Nozzle with partially twisted 8-shaped spray holes Download PDFInfo
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- CN110801954A CN110801954A CN201810881604.XA CN201810881604A CN110801954A CN 110801954 A CN110801954 A CN 110801954A CN 201810881604 A CN201810881604 A CN 201810881604A CN 110801954 A CN110801954 A CN 110801954A
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- nozzle
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- spray hole
- spray
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- 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
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
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Abstract
The invention provides a nozzle with a partially twisted 8-shaped spray hole, which comprises a nozzle body and one or more spray holes arranged on the nozzle body, wherein at least one spray hole comprises a non-twisted spray hole front section and a twisted spray hole rear section with a 8-shaped cross section, the long axis of the 8-shaped cross section of the spray hole rear section rotates along the axis of the spray hole, and the length-width ratio of the 8 shape can be changed along the axis of the spray hole. The jet orifice can form strong turbulence disturbance inside the jet orifice, promote jet flow diffusion and mixing, improve jet flow mixing and diffusion, reduce partial jet resistance compared with a full-torsion jet orifice, and strengthen the interference effect of fluid in two similar-circular pore passages and the disturbance by the 8-shaped middle slit. The numerical calculation shows that the spray particle average diameter can be reduced by 12 percent, the engine thermal efficiency can be improved by 2.2 percent, and the particulate matter emission can be reduced by 22 percent when the spray particle average diameter is reduced by 12 percent 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 partially twisted 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.
According to the nozzle with the partially twisted 8-shaped spray hole, the 8-shaped middle slit can enhance the fluid interference effect in the two similar circular pore passages and enhance disturbance; after the jet orifice is twisted along the axis of the jet orifice, the disturbance effect in the jet orifice can be further improved, the generation of cavitation bubbles is increased, and the jet orifice is favorable for spray crushing. However, considering that the injection resistance is increased by adopting the full-twisted type, a partial-twisted type 8-shaped jet hole structure is provided.
Disclosure of Invention
In view of the above-mentioned problems, it is an object of the present invention to provide a nozzle having twisted 8-shaped orifices in a part thereof, which is capable of generating appropriate internal turbulence and further improving the liquid spray characteristics.
The technical means adopted by the invention are as follows:
a nozzle with partially twisted 8-shaped spray holes comprises a nozzle body and one or more spray holes arranged on the nozzle body, wherein at least one spray hole comprises a non-twisted spray hole front section and a twisted spray hole rear section with a 8-shaped cross section, the long axis of the 8-shaped cross section of the spray hole rear section rotates along the axis of the spray hole, and the length-width ratio of the 8 shape can be changed along the axis of the spray hole.
Furthermore, the corners formed by intersecting the nozzle body surface associated with the jet hole front section are all curved surface transitions.
Further, the twisting direction of the figure 8 is clockwise or counterclockwise.
Further, the area of the front section of the spray hole from the inlet to the outlet is kept constant, and the front section of the spray hole is reduced firstly and then increased, gradually reduced and increased firstly and then reduced.
Further, the area of the rear section of the spray hole from the inlet to the outlet is kept constant, and the rear section of the spray hole is reduced firstly and then increased, gradually reduced and increased firstly and then reduced.
Further, the longitudinal section of the nozzle hole at the front section of the nozzle hole is any one of a rectangle, a tapered type, a gradually expanding type, a tapered-gradually expanding type and a gradually expanding-gradually contracting type.
Further, the longitudinal section of the injection hole at the rear section of the injection hole is any one of a rectangle, a tapered type, a gradually expanding type, a tapered-gradually expanding type and a gradually expanding-gradually contracting type.
Further, the nozzle adopts a 3D printing rapid prototyping 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 condition of liquid injection, thereby leading the nozzle to obtain better injection and mixing characteristics, reducing partial injection resistance compared with a full-torsion type, and having lower 8-shaped processing difficulty. If the fuel nozzle is applied to a direct injection diesel engine, the average diameter of spray particles can be reduced by 12 percent under the same injection pressure, the thermal efficiency of the engine is improved by 2.2 percent, and the emission of particulate matters is reduced by 22 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 perspective view of an 8-shaped orifice with an equal-area torsion section 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 perspective view of the nozzle hole of fig. 1 in a twisted section from the right according to the present invention.
Fig. 4 is a schematic diagram of a two-dimensional structure of a partially twisted 8-shaped orifice with an equal area torsion section according to the present invention.
Fig. 5 is a schematic diagram of a two-dimensional structure of a partially twisted 8-shaped nozzle hole with a gradually-tapered and gradually-enlarged twisted section according to the present invention.
Fig. 6 is a schematic diagram of a two-dimensional structure of a partially twisted 8-shaped orifice with a gradually expanding twist section according to the present invention.
Fig. 7 is a schematic diagram of a two-dimensional structure of a partially twisted 8-shaped orifice with a tapered torsion section according to the present invention.
Fig. 8 is a schematic two-dimensional structure diagram of a partially twisted 8-shaped nozzle hole with a gradually expanding and contracting twisting section according to the present invention.
In the figure: 1. a nozzle body; 2. 3, 9, 15, 21, 27 and 8-shaped spray holes; 4. 10, 16, 22 and 28 spraying the front section of the hole; 5. 11, 17, 23, 29, and an orifice front inlet; 6. 12, 18, 24 and 30 spraying hole front section outlet and spraying hole rear section inlet; 7. 13, 19, 25 and 31 spraying a rear section; 8. 14, 20, 26 and 32 spray a rear section 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 fig. 1, the present invention provides a nozzle with partially twisted 8-shaped orifices, comprising a nozzle body 1 and one or more orifices 2 arranged on the nozzle body, wherein at least one orifice comprises a non-twisted orifice front section and a twisted orifice rear section with a cross section of 8-shaped as shown in fig. 2 and 3, the long axis of the cross section of 8-shaped of the orifice rear section rotates along the orifice axis, and the length-width ratio of 8-shaped can be changed along the orifice axis.
The corners formed by intersecting the surface of the nozzle body associated with the variable cross-section spray holes are all curved surface transitions.
The twisting direction of the figure 8 is clockwise direction or anticlockwise direction. The area of the front section of the spray hole from the inlet to the outlet is kept unchanged, and the spray hole is reduced firstly and then increased, is gradually increased, and is reduced gradually or increased firstly and then reduced. The area of the rear section of the spray hole from the inlet to the outlet is kept unchanged, and the rear section of the spray hole is reduced firstly and then increased, gradually reduced and increased firstly and then reduced. The longitudinal section of the front spray hole of the spray hole is any one of rectangle, taper type, gradual expansion-gradual expansion type and gradual expansion-gradual reduction type. The longitudinal section of the jet hole at the rear section of the jet hole is any one of a rectangle, a tapered type, a gradually expanding type, a tapered-gradually expanding type and a gradually expanding-tapered type.
The nozzle adopts a 3D printing rapid prototyping technology.
Example 1
As shown in fig. 4, in the present embodiment, the cross-sectional areas and the aspect ratios of the inlet 5 and the outlet 6 of the nozzle hole front section (non-twisted section) 4 of the nozzle hole 3 and the inlet 6 and the outlet 8 of the nozzle hole rear section (twisted section) 7 are consistent, the longitudinal sectional shapes thereof are all straight cylindrical, and the 8-shaped cross-section of the twisted section 7 is twisted clockwise by 360 °. Compared with a circular straight hole, the inner part of the spray hole generates stronger turbulent disturbance, more cavitation bubbles are generated at the outlet of the spray hole, the primary atomization and the mixed gas formation of the nozzle are promoted under the two aspects of influences, the 8-shaped middle slit can further enhance the fluid interference of two similar circular pore passages, and the partial jet resistance can be reduced compared with a full-torsion type.
Example 2
As shown in fig. 5, in the present example, the inlet 11 and the outlet 12 of the nozzle hole front section (non-twisted section) 10 of the nozzle hole 9 have the same area and shape, and the longitudinal section is a straight cylinder; the areas and the shapes of an inlet 12 and an outlet 14 of a rear section (a twisting section) 13 of the spray hole are completely consistent, but the cross section area and the longitudinal section adopt a tapered and gradually expanded type in the middle section process, and the 8-shaped twisting section rotates clockwise by 360 degrees.
Example 3
As shown in fig. 6. In the embodiment, the inlet 17 of the spray hole front section (non-twisting section) 16 of the spray hole 15 is larger than the outlet 18, and the cross section and the longitudinal section in the middle section process are in a tapered shape; the inlet 18 of the rear section (torsion section) 19 of the spray hole is smaller than the outlet 20, the middle section adopts a gradually expanding type, and the torsion section rotates 360 degrees anticlockwise in a shape like a Chinese character '8'; the whole spray hole is in a tapered and gradually-expanded type.
Example 4
As shown in fig. 7. In the embodiment, the areas and the shapes of the inlet 23 and the outlet 21 of the jet orifice front section (non-twisting section) 22 of the jet orifice 21 are completely consistent, and the cross section and the longitudinal section in the middle section process are in a tapered and gradually-expanded type; the inlet 24 of the rear section (torsion section) 25 of the spray hole is larger than the outlet 26, the middle section adopts a tapered shape, and the 8-shaped torsion section rotates 360 degrees anticlockwise.
Example 5
As shown in fig. 8. In the embodiment, an inlet 29 of a jet orifice front section (non-twisting section) 28 of the jet orifice 27 is consistent with an outlet 30, and a cross section and a longitudinal section in the middle section process adopt a gradually expanding and gradually reducing type; the inlet 30 of the rear section (torsion section) 31 of the spray hole is consistent with the outlet 32, the middle section adopts a gradually expanding and gradually contracting type, and the 8-shaped torsion section rotates clockwise by 360 degrees.
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 of two similar circular pore channels and enhance disturbance. The jet orifice has a tapered-divergent structure, so that the jet orifice not only has a stronger pressure maintaining effect caused by the tapered jet orifice structure, so that the total energy of fuel oil at the outlet of the jet orifice is increased, but also has the characteristic of larger quantity of cavitation bubbles at the outlet of the divergent jet orifice, and simultaneously can reduce partial jet resistance compared with a full-torsion jet orifice. The numerical calculation shows that the spray particle average diameter can be reduced by 12 percent, the engine thermal efficiency can be improved by 2.2 percent, and the particulate matter emission can be reduced by 22 percent when the spray particle average diameter is reduced by 12 percent 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 (7)
1. A nozzle with partially twisted 8-shaped spray holes comprises a nozzle body, wherein one or more spray holes are formed in the nozzle body, and the nozzle is characterized in that at least one spray hole comprises a non-twisted spray hole front section and a twisted spray hole rear section with a 8-shaped cross section, the long axis of the 8-shaped cross section of the spray hole rear section rotates along the axis of the spray hole, and the length-width ratio of the 8 shape can be changed along the axis of the spray hole.
2. The partially twisted figure-8 orifice nozzle of claim 1 wherein the direction of twist of the figure-8 is clockwise or counter-clockwise.
3. The nozzle with partially twisted 8-shaped orifices according to claim 1, wherein the area of the front section of the orifice from the inlet to the outlet is constant, and the area is either reduced first and then increased, gradually reduced and increased first and then reduced.
4. The nozzle with partially twisted 8-shaped orifices according to claim 1 or 2, wherein the area of the rear section of the orifice from the inlet to the outlet is either constant, decreasing and then increasing, decreasing and then decreasing.
5. The partially twisted 8-hole nozzle according to claim 1 or 3, wherein the longitudinal cross-sectional shape of the hole at the front end is any one of a rectangle, a tapered type, a divergent type, a convergent-divergent type, and a divergent-divergent type.
6. The partially twisted 8-hole nozzle according to claim 4, wherein the longitudinal sectional shape of the hole at the rear stage is any one of a rectangle, a tapered type, a divergent type, a convergent-divergent type, and a divergent-divergent type.
7. The partially twisted 8-orifice nozzle of claim 1, wherein said nozzle is formed by die forming or 3D printing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810881604.XA CN110801954A (en) | 2018-08-05 | 2018-08-05 | Nozzle with partially twisted 8-shaped spray holes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810881604.XA CN110801954A (en) | 2018-08-05 | 2018-08-05 | Nozzle with partially twisted 8-shaped spray holes |
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| Publication Number | Publication Date |
|---|---|
| CN110801954A true CN110801954A (en) | 2020-02-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810881604.XA Pending CN110801954A (en) | 2018-08-05 | 2018-08-05 | Nozzle with partially twisted 8-shaped spray holes |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0184049A1 (en) * | 1984-11-14 | 1986-06-11 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Intermittent type swirl injection nozzle |
| CN102235283A (en) * | 2010-02-04 | 2011-11-09 | 大连理工大学 | Fuel nozzle |
| CN102365450A (en) * | 2010-04-08 | 2012-02-29 | 丰田自动车株式会社 | Fuel injection valve |
| CN103459824A (en) * | 2011-02-02 | 2013-12-18 | 3M创新有限公司 | Nozzle and method of making same |
| CN204034903U (en) * | 2014-09-04 | 2014-12-24 | 马鞍山联洪合成材料有限公司 | A kind of nozzle |
| CN206860338U (en) * | 2017-03-24 | 2018-01-09 | 大连交通大学 | A kind of locomotive diesel machine nozzle |
-
2018
- 2018-08-05 CN CN201810881604.XA patent/CN110801954A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0184049A1 (en) * | 1984-11-14 | 1986-06-11 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Intermittent type swirl injection nozzle |
| CN102235283A (en) * | 2010-02-04 | 2011-11-09 | 大连理工大学 | Fuel nozzle |
| CN102365450A (en) * | 2010-04-08 | 2012-02-29 | 丰田自动车株式会社 | Fuel injection valve |
| CN103459824A (en) * | 2011-02-02 | 2013-12-18 | 3M创新有限公司 | Nozzle and method of making same |
| CN204034903U (en) * | 2014-09-04 | 2014-12-24 | 马鞍山联洪合成材料有限公司 | A kind of nozzle |
| CN206860338U (en) * | 2017-03-24 | 2018-01-09 | 大连交通大学 | A kind of locomotive diesel machine nozzle |
Non-Patent Citations (1)
| Title |
|---|
| 王筱蓉: "《船用低速柴油机燃烧与性能》", 31 July 2017, 北京理工大学出版社 * |
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Application publication date: 20200218 |