CN108404698B

CN108404698B - Fluid mixer and flow guiding device

Info

Publication number: CN108404698B
Application number: CN201810439814.3A
Authority: CN
Inventors: 郑华; 熊孝经
Original assignee: Suzhou Beifeng Intelligent Technology Co ltd
Current assignee: Suzhou Beifeng Intelligent Technology Co ltd
Priority date: 2018-05-09
Filing date: 2018-05-09
Publication date: 2024-02-23
Anticipated expiration: 2038-05-09
Also published as: CN108404698A

Abstract

The utility model provides a fluid mixer, includes the blender casing, the blender casing includes front wall, back wall and perisporium, the front wall with the back wall sets up relatively and by the perisporium is connected and is formed the mixing chamber, set up the fluid input on the front wall, the perisporium is seted up the fluid output, the fluid input with the fluid output is perpendicular to be arranged. The fluid mixer is used for achieving uniform mixing of fluids to obtain mixed fluids, and the fluid diversion converter is used for reducing the turbulence of the mixed fluids to a preset range. The fluid mixer and the flow guiding device provided by the invention can realize uniform mixing of fluid, so that the fluid is fully mixed, the components are uniform, the turbulence is ideal, the phenomenon of diffuse flying of pollutants is reduced, and the sintering processing efficiency is ensured.

Description

Fluid mixer and flow guiding device

Technical Field

The invention belongs to the technical field of 3D printing equipment, and particularly relates to a fluid mixer and a flow guiding device.

Background

Additive manufacturing (Additive Manufacturing, AM) commonly known as 3D printing is a manufacturing technology for manufacturing solid objects by integrating computer-aided design, material processing and forming technology, taking digital model files as the basis, stacking special metal materials, nonmetal materials and medical biological materials layer by layer through a software and numerical control system in the modes of extrusion, sintering, melting, photo-curing, spraying and the like.

Among them, selective laser sintering (Selective Laser Sintering) is an important additive manufacturing method. The principle is that the laser beam selectively sinters the powder material layer by layer according to the layering section information, and the superfluous powder is removed after the complete sintering, so as to obtain the required part.

During the selective laser sintering process, the continuous powder material layer generates considerable amounts of soot, volatiles and aerosols, which are mixed with the flying powder fines, blocking the optical path of the laser beam and affecting the sintering efficiency. Particularly, the supply of the protective gas in the processing chamber further causes the mixing and flying of smoke dust, volatile matters, atomized matters and powder fine scraps, and seriously reduces the sintering processing efficiency.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides the fluid mixer and the flow guiding device, so that the fluid is fully mixed, the components are uniform, the turbulence is ideal, the diffuse flying phenomenon of pollutants is reduced, and the sintering processing efficiency is ensured.

The aim of the invention is achieved by the following technical scheme:

the utility model provides a fluid mixer, includes the blender casing, the blender casing includes front wall, back wall and perisporium, the front wall with the back wall sets up relatively and by the perisporium is connected and is formed the mixing chamber, set up the fluid input on the front wall, the perisporium is seted up the fluid output, the fluid input with the fluid output is perpendicular to be arranged.

As an improvement of the above-mentioned solution, the direction of extension of the fluid input end is kept perpendicularly intersecting the rear wall.

As a further improvement of the above-mentioned solution, the fluid input end has a cylindrical nozzle configuration for increasing the negative pressure of the fluid and ejecting the fluid onto the rear wall.

As a further development of the above-mentioned solution, the mixing chamber has a cylindrical cavity structure, the fluid input being arranged coaxially with the cylindrical cavity structure.

As a further improvement of the above technical solution, the mixing chamber has a flat cavity structure, and the thickness of the flat cavity structure is the distance between the front wall and the rear wall.

As a further improvement of the above technical solution, the extending direction of the fluid input end is consistent with the thickness direction of the flat cavity structure.

As a further improvement of the above technical solution, the fluid output end includes a plurality of diversion grid holes distributed continuously, and the diversion grid holes are vertical to the fluid input end.

As a further improvement of the above technical solution, the split gate holes are distributed along the outer contour array of the peripheral wall in a distribution central angle, and the arc subtended by the distribution central angle takes the center of the mixing chamber as the center of a circle.

As a further improvement of the above technical solution, a mounting ear for external connection is provided on the peripheral wall of the mixer housing.

The fluid mixer is used for achieving uniform mixing of fluids to obtain mixed fluids, and the fluid flow converter is used for reducing the turbulence of the mixed fluids to a preset range.

The beneficial effects of the invention are as follows:

(1) The fluid mixer is used for increasing the speed gradient of the fluid or enabling the fluid to form turbulence, so that uniform mixing of the fluid is realized, the components of the fluid are uniformly distributed, and the average sweeping effect is ensured;

(2) The flow guiding device ensures that the fluid is fully mixed, the components are uniform and the turbulence degree is ideal through the mixing effect of the fluid mixer and the turbulence degree adjusting effect of the flow guiding converter, reduces the diffuse flying phenomenon of pollutants and ensures the sintering processing efficiency.

In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is an isometric view of a fluid mixer provided in example 1 of the present invention;

FIG. 2 is a schematic cross-sectional view of a fluid mixer provided in example 1 of the present invention;

FIG. 3 is an isometric view of a deflector according to embodiment 2 of the present invention;

FIG. 4 is a schematic cross-sectional view of a deflector provided in embodiment 2 of the present invention;

fig. 5 is a schematic perspective view of a first structure of a flow guiding converter of the flow guiding device according to embodiment 2 of the present invention;

fig. 6 is an isometric view of a second structure of a flow guiding converter of the flow guiding device according to embodiment 2 of the present invention;

fig. 7 is a schematic perspective view of a second structure of a flow guiding converter of the flow guiding device according to embodiment 2 of the present invention.

Description of main reference numerals:

1000-flow guiding device, 0100-fluid mixer, 0110-mixer housing, 0111-front wall, 0112-rear wall, 0113-peripheral wall, 0114-mixing chamber, 0120-fluid input, 0130-fluid output, 0131-flow dividing grid holes, 0140-mounting ears, 0200-flow guiding converter, 0210-flow guiding housing, 0211-flow guiding input, 0212-flow guiding cavity, 0213-flow guiding output, 0220-flow guiding vanes.

Detailed Description

In order to facilitate an understanding of the present invention, the fluid mixer and the deflector will be described more fully below with reference to the accompanying drawings. The figures show preferred embodiments of the fluid mixer and the flow guiding device. However, the fluid mixer and the flow directing device may be implemented in many different forms and are not limited to the embodiments described herein. Rather, the purpose of these embodiments is to provide a more thorough and complete disclosure of the fluid mixer and flow directing device.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the fluid mixers and deflectors is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to fig. 1-2 in combination, the present embodiment discloses a fluid mixer 0100, wherein a body of the fluid mixer 0100 comprises a mixer housing 0110 for providing uniform mixing of fluids. The mixer housing 0110 houses a mixing chamber 0114, which is the primary site of fluid mixing. The mixer housing 0110 includes a front wall 0111, a rear wall 0112 and a peripheral wall 0113, the front wall 0111 and the rear wall 0112 being disposed opposite each other and connected by the peripheral wall 0113, the three enclosing a mixing chamber 0114.

A fluid input 0120 is provided on the front wall 0111 to input fluid into the mixing chamber 0114. Since front wall 0111 is maintained opposite rear wall 0112, fluid input 0120 is also maintained opposite rear wall 0112, causing fluid input from fluid input 0120 to impinge on rear wall 0112, thereby increasing the velocity gradient of the fluid or creating turbulence while a change in flow direction occurs. Therefore, the fluid is subjected to split mixing in the mixing chamber 0114 and has intense vortex caused by turbulence, so that the fluid is fully mixed, and the molecular distribution of the fluid is ensured to be more uniform.

It will be appreciated that the specific type of fluid will depend on the application. In 3D printing equipment, the fluid is typically an inert gas (e.g., argon) or nitrogen to provide a protective atmosphere within the processing chamber that prevents oxidation of the powder. In practical application, the fluid input end 0120 can be connected with an inert gas source to directly input fluid.

The angle between the fluid input end 0120 and the rear wall 0112 depends on the practical application environment, and the extending direction of the fluid input end 0120 is perpendicular to the rear wall 0112, so that the input fluid vertically impacts the surface of the rear wall 0112, and the Turbulence Level is further increased to improve the mixing effect.

Wherein the peripheral wall 0113 is provided with a fluid output end 0130 for outputting the mixed fluid. Wherein the fluid input 0120 is arranged perpendicular to the fluid output 0130. Here, the direction of the fluid output end 0130 is relatively close to the surface direction of the rear wall 0112, so that the fluid output through the mixing steering is ensured to flow smoothly, and the fluid output has a uniform molecular structure all the time.

Illustratively, the fluid input 0120 has a cylindrical nozzle configuration for increasing the negative pressure of the fluid and ejecting the fluid onto the back wall 0112. In other words, the fluid input 0120 has a cylindrical configuration, causing the fluid to accelerate under the Bernoulli effect. In combination with the area difference between the fluid input 0120 and the mixing chamber 0114, a better jet flow effect occurs when the fluid leaves the fluid input 0120, and the turbulence after impacting the rear wall 0112 is further improved, so that the mixing effect of the fluid is promoted.

Illustratively, mixing chamber 0114 has a cylindrical cavity structure with fluid input 0120 disposed coaxially with the cylindrical cavity structure. In other words, the front wall 0111 and the rear wall 0112 are kept parallel and perpendicular to the peripheral wall 0113, respectively, and the inner surface of the peripheral wall 0113 is a cylindrical surface. In coaxial relationship, the point of impact of the fluid on the back wall 0112 is centered. The fluid with certain turbulence formed after impact leaves the mixing chamber 0114 through the fluid output end 0130 towards the component parts of the fluid output end 0130; the components in the other directions are rotated at a high speed by the action of the inner surface of the peripheral wall 0113, and are further vortex-mixed and output through a fluid output end 0130. It can be seen that the cylindrical cavity structure has its special cyclotron effect, increasing the turbulence of the fluid.

Illustratively, the mixing chamber 0114 has a flat cavity structure with a thickness that is the spacing of the front wall 0111 from the rear wall 0112. The thickness dimension of the flat cavity structure is smaller, so that the distance between the fluid output end 0130 and the rear wall 0112 is smaller, the ideal speed of the sprayed fluid before impact is ensured to be kept all the time, the attenuation is avoided, and a better impact mixing effect is obtained. Further, for the mixing chamber 0114 with a flat cylindrical cavity structure, the fluid flow is more concentrated, and the cyclotron effect is more remarkable.

Illustratively, the direction of extension of the fluid input 0120 coincides with the thickness direction of the flat cavity structure. Wherein the extension direction of the fluid input end 0120 is consistent with the fluid flow direction. With the foregoing configuration, the fluid impacts the back wall 0112 vertically in a positive direction, with more energy being concentrated.

As previously described, the fluid output ports 0130 extend through the interior and exterior of the peripheral wall 0113 to allow the fluid within the mixing chamber 0114 to be expelled. Illustratively, the fluid output 0130 includes a plurality of serially disposed shunt gate holes 0131, each of the shunt gate holes 0131 being perpendicular to the fluid input 0120. The diversion grid holes 0131 are used for realizing diversion of output fluid, so that the fluid is concentrated, the turbulence is reduced, the controllable degree of the fluid is enhanced, and the subsequent application of the fluid is facilitated.

Illustratively, the shunt gate holes 0131 are distributed along the outer contoured array of the peripheral wall 0113 over a range of distribution central angles, the arcs subtended by the distribution central angles being centered about the center of the mixing chamber 0114. For example, in the above cylindrical cavity structure, the diversion gate holes 0131 are distributed along the outer circumference arc of the peripheral wall 0113, so that the diversion effect is more ideal, the diversion hierarchical structure is obvious, and the turbulence of the output fluid is further reduced.

The range of the distribution central angle depends on the actual need, and the angle range of the distribution central angle is 70-90 degrees exemplarily. In the range, the distribution grid holes 0131 act at different positions in sequence, and the distribution hierarchical structure is ideal.

Illustratively, mounting ears 0140 for external connection are provided on the peripheral wall 0113 of the mixer housing 0110. The mounting lug 0140 is used for being connected and fixed with an external element, so that the fluid mixer 0100 is tightly mounted with the external element, and the connection tightness of the flow channel is ensured. In one embodiment, the number of mounting ears 0140 is 2 and is symmetrically disposed on either side of the fluid output end 0130. Thus, the output fluid of the fluid output end 0130 can be uniformly output to the external element, and the flow channel is smooth and smooth.

Example 2

Referring to fig. 3 to 4 in combination, on the basis of embodiment 1, the present embodiment discloses a flow guiding device 1000, which includes a fluid mixer 0100 and a flow guiding transducer 0200. Wherein the fluid output end 0130 of the fluid mixer 0100 is coupled in matching relation with an input end of the diversion transformer 0200 (i.e., diversion input 0211). The fluid mixer 0100 is configured to mix the fluid uniformly to obtain a mixed fluid, and the fluid diversion converter 0200 is configured to reduce turbulence of the mixed fluid to a predetermined range.

It should be noted that when the flow guiding device 1000 is applied to a 3D printing apparatus, the protective gas in the processing chamber of the apparatus may have the following characteristics: firstly, the protective gas has turbulent flow characteristics, so that the protective gas is fully mixed with smoke dust, volatile matters, fine powder materials and the like and then discharged, and the cleaning of a processing chamber is realized; second, the turbulence of the shielding gas should be below a threshold value to avoid diffusion of contaminants from the process chamber. The threshold is the minimum turbulence that causes dust, volatiles, and fines of powder material to spread throughout the process chamber, i.e., turbulence that localizes turbulence in the region of the connection between the gas input and the gas output of the process chamber. Illustratively, in this application, the shielding gas has a turbulence level of no more than 5%.

Referring to fig. 5, the main body of the flow-guiding converter 0200 includes a flow-guiding housing 0210. The flow-guiding housing 0210 has a flow-guiding input end 0211, a flow-guiding cavity 0212 and a flow-guiding output end 0213, which are sequentially communicated to form a fluid flow channel. Wherein, the connection part of the flow guiding input end 0211, the flow guiding cavity 0212 and the flow guiding output end 0213 is in smooth transition, and the wall surface of the flow guiding cavity 0212 is smooth and continuous, so as to reduce the loss of the fluid along the path and reduce the turbulence phenomenon. The flow cross section of the flow guiding housing 0210 increases gradually from the flow guiding input end 0211 to the flow guiding output end 0213, so that the flow speed of the fluid flowing through the flow guiding housing decreases gradually, and the turbulence of the fluid is controlled in a lower range.

The lumen 0212 is variously constructed, and the lumen 0212 has a flat-shaped cavity construction, for example. The thickness dimension of the flat cavity structure (i.e. the distance between the front and rear walls of the flow guiding shell 0210) is smaller, so that the through-flow section is in a long and narrow profile. In this configuration, the purge range of the output fluid of the lumen 0212 is highly controllable. When applied to the processing chamber of the 3D printing apparatus, the shielding gas output from the flow guiding converter 0200 is concentrated in the required protection and cleaning range, and the protection effect is concentrated and the diffusion of pollutants is avoided.

The width of the flat cavity structure increases gradually from the flow guiding input end 0211 to the flow guiding output end 0213, so that the increasing purpose of the through flow section is realized, and the flow guiding output end 0213 forms a flat port structure. Similarly, the flat-mouth structure has a smaller width dimension, forming an elongated output face. Exemplary elongated output surfaces include elongated oval, elongated rectangular, and the like.

Wherein, the appearance of flat cavity structure is various. The flat cavity configuration has a triangular projection profile in its thickness direction, for example. In other words, the cross section taken by a plane normal to the thickness direction of the flat cavity structure has a triangular shape. The base of the triangle is located on the flow-guiding output end 0213, and the vertex opposite to the base is located on the flow-guiding input end 0211.

The flat cavity structure has a symmetrical structure along the width direction, and a diversion input end 0211 and a diversion output end 0213 are formed at two ends of the symmetrical axis. In other words, the flat cavity structure, the flow guiding input end 0211 and the flow guiding output end 0213 have a central coaxial relationship. For example, in the case of the aforementioned triangular projection profile, the triangle is an isosceles triangle.

Illustratively, a plurality of guide vanes 0220 are disposed in the guide chamber 0212, wherein the guide vanes 0220 extend from the guide input end 0211 to the guide output end 0213, and the guide chamber 0212 is divided into a plurality of guide channels by the guide vanes 0220. The fluid enters the diversion flow channel to form a plurality of diversion flows to realize diversion. Any split fluid is restricted by the flow guide channel where the split fluid is positioned, so that the turbulence is further reduced, and the controllable degree of the fluid is enhanced. Among them, the guide vane 0220 may be made of various materials such as metal or plastic, and has a thin-walled strip structure.

Exemplarily, the plurality of flow guiding blades 0220 are distributed along the gradually-changed dimension direction of the flow guiding cavity 0212, the flow guiding blades 0220 are respectively connected with the front wall and the rear wall of the flow guiding cavity 0212, and the flow cross section of any flow guiding channel increases gradually from the flow guiding input end 0211 to the flow guiding output end 0213. In other words, the plurality of flow guiding channels are sequentially adjacent to each other along the gradual size direction of the flow guiding cavity 0212. The gradual change of the size of the flow guiding cavity 0212 refers to a size that causes the flow cross section to increase gradually from the flow guiding input end 0211 to the flow guiding output end 0213. For example, in the flat cavity configuration described above, the graded size of the plenum 0212 is its width direction.

The array rule of the guide vanes 0220 is determined according to the specific structure of the guide cavity 0212, so that the purpose of reducing the turbulence degree of fluid is achieved. Illustratively, the plurality of guide vanes 0220 have the same included angle therebetween. In other words, the guide blades 0220 are uniformly distributed along the same distribution arc. In the flat cavity structure with the symmetrical structure, the circle center of the distribution circular arc is positioned on the symmetrical axis of the flat cavity structure. Further, the normal line of the plane where the distribution circular arc is located is along the thickness direction of the flat cavity structure.

The plurality of guide vanes 0220 form a circular arc distribution structure at one end of the guide vanes close to the guide input end 0211, so that the guide input end 0211 of the guide runner is smoother, thereby further reducing the obstruction and loss during the diversion and further reducing the turbulence.

Exemplarily, the flow guiding vane 0220 and a side wall surface of the closest flow guiding cavity 0212 have a consistent variation trend, so that the surface of each flow guiding channel is smoother, and the smooth flow of the split fluid is ensured. For example, in a flat cavity configuration with curved side walls, the guide vane 0220 has an arc-shaped surface, and the undulation rule of the arc-shaped surface is consistent with the side wall of the guide cavity 0212 on the same side.

It should be noted that the shapes of the flow guiding input end 0211 and the flow guiding output end 0213 are various, and generally adapt to the shape of the external element connected with them. Illustratively, the flow-guiding input end 0211 has a circular arc shape and has a concentric relationship with a circular arc distribution structure formed by arranging the ends of the flow-guiding blades 0220. Referring to fig. 6-7 in combination, another exemplary embodiment of the flow directing input 0211 may be a conduit extending axially along the flow directing lumen 0212.

Additionally, the shell 0210 can take on a variety of shapes. Illustratively, the plenum housing 0210 has a thin-walled housing structure that conforms to the shape of the plenum chamber 0212. In this configuration, the size of the air guiding housing 0210 is compact, and the dead weight is effectively reduced.

Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.

Claims

1. The fluid mixer is characterized by comprising a mixer shell, wherein the mixer shell comprises a front wall, a rear wall and a peripheral wall, the front wall and the rear wall are arranged oppositely and are connected through the peripheral wall to form a mixing chamber, a fluid input end is arranged on the front wall, a fluid output end is arranged on the peripheral wall, and the fluid input end is arranged perpendicularly to the fluid output end;

the extending direction of the fluid input end is perpendicularly intersected with the rear wall;

the fluid input end has a cylindrical nozzle configuration for increasing the negative pressure of the fluid and ejecting the fluid onto the rear wall;

the mixing chamber has a cylindrical cavity structure, the fluid input end being arranged coaxially with the cylindrical cavity structure;

the mixing chamber is provided with a flat cavity structure, and the thickness of the flat cavity structure is the distance between the front wall and the rear wall;

the extending direction of the fluid input end is consistent with the thickness direction of the flat cavity structure;

the fluid output end comprises a plurality of distribution grid holes which are distributed continuously, and the distribution grid holes are vertical to the fluid input end.

2. The fluid mixer of claim 1, wherein the diverter gate holes are distributed along the outer contour array of the peripheral wall within a distribution central angle, the arc subtended by the distribution central angle being centered about the center of the mixing chamber.

3. The fluid mixer of claim 1, wherein the peripheral wall of the mixer housing is provided with mounting ears for external connection.

4. A fluid guiding device, comprising a fluid guiding converter and the fluid mixer according to any one of claims 1-3, wherein the fluid output end is in matched connection with the input end of the fluid guiding converter, the fluid mixer is used for realizing uniform mixing of fluids to obtain mixed fluids, and the fluid guiding converter is used for reducing the turbulence of the mixed fluids to a preset range.