阅读说明：本技术 一种带扭转式窄缝型喷孔的喷嘴 (Nozzle with torsional narrow slit type spray holes ) 是由 隆武强 肖鸽 田华 崔靖晨 于 2018-08-05 设计创作，主要内容包括：本发明提供一种带扭转式窄缝型喷孔的喷嘴,本发明包括喷嘴本体和在所述喷嘴本体上设置的一个或多个喷孔,其中至少一个喷孔的横截面为窄缝型,所述窄缝的长轴沿着喷孔轴线旋转,所述窄缝的长宽比可沿着喷孔轴线变化。本发明采用具备扭转式窄缝型横截面的喷孔,一是能够形成喷雾体积更广的扇形喷雾,二是可以在喷孔内部形成强烈的湍流扰动,促进射流扩散与混合；并采用窄缝长宽比可变的设计,使喷孔具有良好的保压性能和空化特性,进一步改善射流混合与扩散。通过数值计算发现,本发明应用于直喷式柴油机,可在相同喷射压力下使喷雾粒子平均直径减小18％,发动机热效率提高2.8％,颗粒物排放降低28％。(The invention provides a nozzle with a torsional narrow slit type spray hole, which 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 in a narrow slit type, the long axis of the narrow slit rotates along the axis of the spray hole, and the length-width ratio of the narrow slit can be changed along the axis of the spray hole. The invention adopts the spray orifice with the torsional narrow slit type cross section, so that fan-shaped spray with wider spray volume can be formed, and strong turbulence disturbance can be formed in the spray orifice to promote jet flow diffusion and mixing; and the design that the length-width ratio of the narrow slit is variable is adopted, so that the spray hole has good pressure maintaining performance and cavitation property, and jet mixing and diffusion are further improved. The numerical calculation shows that the spray particle average diameter can be reduced by 18 percent, the engine thermal efficiency can be improved by 2.8 percent, and the particulate matter emission can be reduced by 28 percent when the spray particle average diameter is applied to a direct injection diesel engine under the same injection pressure.)

1. A nozzle with a torsional narrow slit type spray hole 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 in a narrow slit type, the long axis of the narrow slit rotates along the axis of the spray hole, and the length-width ratio of the narrow slit can be changed along the axis of the spray hole.

2. The twisted slot-orifice nozzle of claim 1, wherein the twist direction of the slot is clockwise or counterclockwise.

3. The nozzle with a twisted slit-type orifice according to claim 1 or 2, wherein the area from the orifice inlet to the orifice outlet is either one of reduced and then increased, gradually decreased, and increased and then decreased in order to be constant.

4. The twisted slit-type nozzle of claim 3, wherein the longitudinal sectional shape of the nozzle hole 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 twisted slot orifice of claim 1, wherein said nozzle is formed by die forming or 3D printing.

Technical Field

The invention relates to the technical field of fluid jet, in particular to a nozzle with a torsional narrow-slit type jet 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. To improve spray mixing, a wider spray volume is desired. Aiming at the problems, the invention provides the torsional narrow-slit spray hole which can effectively form fan-shaped spray with wider spray volume, and turbulence is enhanced after torsion, so that the spray disturbance is violent, and the mixing is facilitated.

Disclosure of Invention

In view of the above-mentioned problems, a nozzle with a twisted slit-type nozzle hole 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 a torsional narrow slit type spray hole 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 in a narrow slit type, the long axis of the narrow slit rotates along the axis of the spray hole, and the length-width ratio of the narrow slit can be changed along the axis of the spray hole.

Further, the torsion direction of the narrow slit is clockwise or counterclockwise.

Further, the area from the inlet to the outlet of the nozzle hole is kept constant, and the area is reduced first and then increased, gradually reduced and increased first and then reduced.

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 adopts 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 18 percent under the same injection pressure, the thermal efficiency of the engine is improved by 2.8 percent, and the emission of particulate matters is reduced by 28 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 two-dimensional structure diagram of an equal-area torsion type narrow slit nozzle hole 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 two-dimensional structure diagram of a tapered and diverging twisted narrow slit nozzle hole according to an embodiment of the present invention.

Fig. 4 is a schematic two-dimensional structure diagram of a divergent torsional narrow slit nozzle hole according to an embodiment of the present invention.

Fig. 5 is a schematic two-dimensional structure diagram of a tapered twisted narrow slit nozzle according to an embodiment of the present invention.

Fig. 6 is a schematic two-dimensional structure diagram of a gradually expanding and gradually contracting type twisted narrow slit type nozzle hole according to an embodiment of the present invention.

In the figure: 1. a nozzle body; 2. 3, 6, 9, 12, 15, narrow slit type cross section spray holes; 4. 7, 10, 13, 16, narrow slit type cross section orifice entrance; 5. 8, 11, 14, 17, a narrow slit type cross section orifice exit.

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. 2, the present invention provides a nozzle with a twisted slit type nozzle hole, comprising a nozzle body 1 and one or more nozzle holes 2 arranged on the nozzle body, wherein the cross section of at least one nozzle hole is slit type, the long axis of the slit rotates along the axis of the nozzle hole, and the length-width ratio of the slit can be changed along the axis of the nozzle hole.

The twisting direction of the narrow slit is clockwise or anticlockwise. The area from the inlet to the outlet of the spray hole 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 adopts a mold forming or 3D printing technology.