CN110801954A - Nozzle with partially twisted 8-shaped spray holes - Google Patents

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

A nozzle with a partially twisted figure 8 orifice

technical field

The present invention relates to the technical field of fluid jetting, in particular, to a nozzle with a partially twisted 8-shaped jetting hole.

Background technique

In the application practice in many fields such as industry, agriculture, medical and health, national defense technology, etc., fluid injection technology is involved, and the fluid is injected by nozzles under a certain pressure to achieve their respective purposes. For example, in the field of internal combustion engines, when using liquid fuel, a certain amount of liquid fuel needs to be injected into the intake pipeline or cylinder through a pressure nozzle in a very short time to form a spray, so that the fuel and air can be quickly and fully mixed and burned. The carrier that carries out the injection has an important influence on the spray characteristics of the liquid fuel, which in turn affects the combustion and emission characteristics of the internal combustion engine.

Generally, nozzle holes need to be set in the fluid nozzle, and the geometry and size of the nozzle holes have an important influence on the spray characteristics. Currently, the most used nozzles are circular in cross-section, such as cylindrical nozzles and conical nozzles. Conical nozzles include tapered and tapered nozzles.

It is well known that the internal geometry of a fluid nozzle affects its internal flow field properties. For example, in the field of internal combustion engines, the internal geometry of the liquid fuel nozzle affects its cavitation bubble generation characteristics, pressure and velocity distribution characteristics, and then affects the spray characteristics of the liquid fuel. Improving fluid ejection characteristics through innovative design of fluid nozzle internal geometry is an important technological approach.

In the nozzle with a partially twisted 8-shaped nozzle provided by the present invention, the 8-shaped middle slit can enhance the fluid interference effect in the two quasi-circular channels and enhance the disturbance; after twisting along the axis of the nozzle, it can further improve the internal flow of the nozzle. The disturbance effect increases the generation of cavitation bubbles, which is conducive to spray breakage. However, considering that the use of the full torsion type will increase the injection resistance, a partially torsion type 8-shaped nozzle structure is provided.

SUMMARY OF THE INVENTION

According to the above-mentioned technical problem, there is provided a nozzle with a partially twisted 8-shaped orifice which can generate suitable internal turbulent disturbance to further improve the liquid spray characteristics.

The technical means adopted in the present invention are as follows:

A nozzle with a partially twisted 8-shaped nozzle, comprising a nozzle body and one or more nozzle holes provided on the nozzle body, wherein at least one nozzle hole includes a non-twisted nozzle hole front section and a twisted cross section of In the rear section of the 8-shaped injection hole, the long axis of the 8-shaped cross section of the rear section of the injection hole rotates along the axis of the injection hole, and the aspect ratio of the 8-shaped shape can be changed along the axis of the injection hole.

Further, all the corners formed by the surface-to-surface intersection of the nozzle body associated with the front section of the nozzle hole are curved surface transitions.

Further, the twisting direction of the figure 8 is clockwise or counterclockwise.

Further, the area of the front section of the injection hole from the inlet to the outlet remains unchanged, first decreases and then increases, gradually increases, gradually decreases, and first increases and then decreases.

Further, the area of the rear section of the injection hole from the inlet to the outlet remains unchanged, first decreases and then increases, gradually increases, gradually decreases, and first increases and then decreases.

Further, the longitudinal cross-sectional shape of the nozzle hole in the front section of the nozzle hole is any one of a rectangle, a tapered type, a gradually expanded type, a tapered-to-expanded type, and a gradually expanded-to-contracted type.

Further, the longitudinal cross-sectional shape of the nozzle hole at the rear section of the nozzle hole is any one of a rectangle, a tapered type, a gradually expanded type, a tapered-to-expanded type, and a gradually expanded-to-contracted type.

Further, the nozzle adopts 3D printing rapid prototyping technology.

The present invention is applicable to various fields that need to use equipment such as nozzles, spray heads or injectors to spray liquid or gas. Compared with the prior art, the invention can strengthen the turbulent flow disturbance inside the nozzle hole, and can also improve the generation and velocity distribution of cavitation bubbles inside the nozzle under the condition of liquid injection, so that the nozzle can obtain better injection and mixing characteristics, and Compared with the full torsion type, part of the injection resistance can be reduced, and the figure-8 processing is less difficult. For example, it can reduce the average diameter of spray particles by 12% under the same injection pressure, increase the thermal efficiency of the engine by 2.2%, and reduce particulate matter emissions by 22%. For the above reasons, the present invention can be widely applied in the field of fluid ejection technology.

Description of drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

FIG. 1 is a schematic three-dimensional structural diagram of a figure-eight nozzle with an equal-area twisted segment according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a fluid nozzle body and nozzle holes of the present invention.

FIG. 3 is a right side view of the twisted section of the perspective view of the nozzle hole shown in FIG. 1 of the present invention.

4 is a schematic diagram of a two-dimensional structure in which the twisted section according to the present invention is an equal-area partially twisted figure-eight nozzle hole.

FIG. 5 is a two-dimensional structural schematic diagram of the torsion section according to the present invention, which is a tapered and expanded partially twisted figure-eight nozzle hole.

6 is a schematic diagram of a two-dimensional structure in which the twisted section of the present invention is a gradually expanding partially twisted 8-shaped nozzle hole.

FIG. 7 is a two-dimensional structural schematic diagram of the twisted section according to the present invention, which is a tapered partially twisted 8-shaped nozzle hole.

FIG. 8 is a two-dimensional structural schematic diagram of the torsion section according to the present invention, which is a gradually expanding and tapering partially twisted figure-eight nozzle hole.

In the figure: 1. Nozzle body; 2, 3, 9, 15, 21, 27, 8-shaped nozzle holes; 4, 10, 16, 22, 28 nozzle front section; 5, 11, 17, 23, 29, nozzle holes Front section inlet; 6, 12, 18, 24, 30 nozzle outlet front section, nozzle rear section inlet; 7, 13, 19, 25, 31 nozzle rear section; 8, 14, 20, 26, 32 nozzle rear section Export.

Detailed ways

It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict. The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

In order to make the purposes, 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 accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terminology used herein is for the purpose of describing specific embodiments only, and is not intended to limit the exemplary embodiments according to the present invention. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural as well, furthermore, it is to be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates that There are features, steps, operations, devices, components and/or combinations thereof.

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 invention unless specifically stated otherwise. Meanwhile, it should be understood that, for convenience of description, the dimensions of various parts shown in the accompanying drawings are not drawn in an actual proportional relationship. Techniques, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the authorized specification. In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other examples of exemplary embodiments may have different values. It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further discussion in subsequent figures.

In the description of the present invention, it should be understood that the orientations indicated by orientation words such as "front, rear, top, bottom, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" etc. Or the positional relationship is usually based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and these orientation words do not indicate or imply the indicated device or element unless otherwise stated. It must have a specific orientation or be constructed and operated in a specific orientation, so it should not be construed as a limitation on the scope of protection of the present invention: the orientation words "inside and outside" refer to the inside and outside relative to the contour of each component itself.

For ease of description, spatially relative terms, such as "on", "over", "on the surface", "above", etc., may be used herein to describe what is shown in the figures. The spatial positional relationship of one device or feature shown to other devices or features. It should be understood that 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 the device in the figures is turned over, elements described as "above" or "over" other devices or features would then be oriented "below" or "over" the other devices or features under its device or structure". Thus, the exemplary term "above" can encompass both an orientation of "above" and "below." The device may also be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood to limit the scope of protection of the present invention.

As shown in FIG. 1 , the present invention provides a nozzle with a partially twisted 8-shaped nozzle, comprising a nozzle body 1 and one or more nozzle holes 2 provided on the nozzle body, wherein at least one nozzle hole includes The non-twisted front section of the nozzle hole and the rear section of the nozzle hole with a twisted cross section as shown in Figures 2 and 3 are 8-shaped. The aspect ratio of the figure 8 can vary along the orifice axis.

The corners formed by the face-to-face intersection of the nozzle body associated with the nozzle hole with variable cross-section are all curved surface transitions.

The twisting direction of the figure 8 is clockwise or counterclockwise. The area of the front section of the spray hole from the inlet to the outlet remains unchanged, first decreases and then increases, gradually increases, gradually decreases, and first increases and then decreases. The area of the rear section of the spray hole from the inlet to the outlet remains unchanged, first decreases and then increases, gradually increases, gradually decreases, and first increases and then decreases. The shape of the longitudinal section of the nozzle hole in the front section of the nozzle hole is any one of a rectangle, a tapered type, a gradually expanded type, a tapered-to-expanded type, and a gradually expanded-to-contracted type. The longitudinal section shape of the nozzle hole in the rear section of the nozzle hole is any one of a rectangle, a tapered type, a gradually expanded type, a tapered-to-expanded type, and a gradually expanded-to-contracted type.

The nozzle adopts 3D printing rapid prototyping technology.

Example 1

As shown in FIG. 4 , in this embodiment, the area and length of the inlet 5 and the outlet 6 of the front section (non-twisted section) 4 of the nozzle hole 3 and the inlet 6 and the outlet 8 of the rear section (twisted section) 7 of the nozzle hole and the length The width ratio remains the same, the shape of the longitudinal section is straight, and the figure-eight cross section of the torsion section 7 is twisted 360° clockwise. Compared with the circular straight hole, the nozzle in this example produces more intense turbulent flow disturbance, and more cavitation bubbles are generated at the nozzle outlet. These two effects both promote the primary atomization of the nozzle and the mixed gas. Formed, the 8-shaped middle slit can further strengthen the fluid interference of the two quasi-circular orifices, and can reduce part of the injection resistance compared with the full-twist type.

Example 2

As shown in FIG. 5 , in this example, the area and shape of the inlet 11 and the outlet 12 of the front section (non-twisted section) 10 of the nozzle hole 9 are completely the same, and the longitudinal section adopts a straight cylinder type; The area and shape of the inlet 12 and the outlet 14 are exactly the same, but in the middle section, the cross-sectional area and the longitudinal section are tapered and expanded, and the torsion section of the figure-8 is rotated 360° clockwise.

Example 3

As shown in Figure 6. In this embodiment, the inlet 17 of the nozzle hole 15 is larger than the outlet 18 in the front section (non-twisted section) of the nozzle hole, and the cross-sectional area and longitudinal section in the middle section are tapered; the rear section of the nozzle hole (twisted section) 19. The inlet 18 is smaller than the outlet 20, the middle section adopts the gradual expansion type, and the torsion section of the figure-8 is rotated 360° counterclockwise; the nozzle hole is generally tapered and gradually expanded.

Example 4

As shown in Figure 7. In this embodiment, the area and shape of the inlet 23 and the outlet 21 of the front section (non-torsion section) 22 of the nozzle hole 21 are completely the same, and the cross-sectional area and longitudinal section in the middle section are tapered and expanded; The inlet 24 of the segment (torsion segment) 25 is larger than the outlet 26, the middle segment process adopts a tapered type, and the torsion segment 8 is rotated 360° counterclockwise.

Example 5

As shown in Figure 8. In this embodiment, the inlet 29 of the front section (non-twisted section) 28 of the nozzle hole 27 is consistent with the outlet 30, and the cross-sectional area and longitudinal section in the middle section are gradually expanded and tapered; ) 31 The inlet 30 is the same as the outlet 32, the middle section adopts a gradually expanding and tapering type, and the torsion section 8 is rotated 360° clockwise.

The above examples are only partial schematic diagrams of the structure, and the change of the aspect ratio of the figure-eight shape, the change of the cross-sectional area, the structural type of the longitudinal cross-section, and the angle of torsion can be combined arbitrarily.

Compared with the circular straight hole, the nozzle of this example has the characteristics of the twisted figure-eight nozzle to enhance the internal turbulent disturbance, and the middle slit of the figure-eight can enhance the fluid interference effect of the two quasi-circular orifices and enhance the disturbance. Also because it has a tapered-expanded structure, the nozzle hole described in this example not only has a strong pressure-holding effect caused by the tapered nozzle hole structure, which increases the total energy of the fuel at the nozzle outlet, but also has the ability to gradually increase the pressure. The large number of cavitation bubbles at the outlet of the expanded nozzle can reduce part of the injection resistance compared with the fully twisted nozzle. Through numerical calculation, it is found that the present invention can reduce the average diameter of spray particles by 12%, increase the thermal efficiency of the engine by 2.2%, and reduce the emission of particulate matter by 22% under the same injection pressure when applied to a direct injection diesel engine.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (7)

1. a nozzle with a partially twisted 8-shaped nozzle, comprising a nozzle body, one or more nozzles are provided on the nozzle body, wherein at least one nozzle comprises a non-twisted nozzle front section and The cross section of the twist is a figure-8-shaped rear section of the injection hole, the long axis of the figure-8 in the cross-section of the rear section of the injection hole rotates along the injection hole axis, and the aspect ratio of the figure-8 shape can vary along the injection hole axis. 2 . The nozzle with a partially twisted figure-eight nozzle according to claim 1 , wherein the twisting direction of the figure-eight is clockwise or counterclockwise. 3 . 3. The nozzle with a partially twisted 8-shaped orifice according to claim 1, wherein the area of the front section of the orifice remains unchanged from the inlet to the outlet, first decreases and then increases, and gradually increases, Either gradually decreasing or first increasing and then decreasing. 4. The nozzle with a partially twisted 8-shaped nozzle according to claim 1 or 2, wherein the area of the rear section of the nozzle remains unchanged from the inlet to the outlet, first decreases and then increases, gradually Either increase, decrease gradually, or increase first and then decrease. 5. The nozzle with a partially twisted 8-shaped nozzle according to claim 1 or 3, characterized in that, the vertical cross-sectional shape of the nozzle in the front part of the nozzle is a rectangle, a tapered type, a gradually expanded type, and a tapered- Either of the tapered type and the tapered tapered type. 6 . The nozzle with a partially twisted 8-shaped nozzle according to claim 4 , wherein the vertical cross-sectional shape of the nozzle in the rear section of the nozzle is rectangular, tapered, tapered, tapered- tapered. 7 . Either of the expanding type and the expanding-contracting type. 7 . The nozzle with a partially twisted 8-shaped nozzle according to claim 1 , wherein the nozzle is processed by mold forming or 3D printing technology. 8 .

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