CN114713857B - Air current integration structure and 3D printing apparatus - Google Patents
Air current integration structure and 3D printing apparatus Download PDFInfo
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- CN114713857B CN114713857B CN202210196165.5A CN202210196165A CN114713857B CN 114713857 B CN114713857 B CN 114713857B CN 202210196165 A CN202210196165 A CN 202210196165A CN 114713857 B CN114713857 B CN 114713857B
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- 230000010354 integration Effects 0.000 title claims abstract description 33
- 238000010146 3D printing Methods 0.000 title claims abstract description 19
- 238000005192 partition Methods 0.000 claims description 25
- 125000006850 spacer group Chemical group 0.000 claims description 24
- 238000000034 method Methods 0.000 abstract description 13
- 238000007639 printing Methods 0.000 abstract description 13
- 239000006227 byproduct Substances 0.000 abstract description 9
- 239000000779 smoke Substances 0.000 abstract description 7
- 239000000428 dust Substances 0.000 abstract description 5
- 239000000654 additive Substances 0.000 abstract description 3
- 230000000996 additive effect Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 25
- 239000000843 powder Substances 0.000 description 21
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- 238000007664 blowing Methods 0.000 description 11
- 239000011261 inert gas Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000002441 reversible effect Effects 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
- B22F12/70—Gas flow means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/20—Direct sintering or melting
- B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F12/00—Apparatus or devices specially adapted for additive manufacturing; Auxiliary means for additive manufacturing; Combinations of additive manufacturing apparatus or devices with other processing apparatus or devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y30/00—Apparatus for additive manufacturing; Details thereof or accessories therefor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
Abstract
The invention relates to the technical field of additive manufacturing, in particular to an airflow integration structure and 3D printing equipment. The airflow integration structure comprises a first connecting part and a second connecting part, and an air inlet and a first air outlet are formed in the first connecting part; the inside of second connecting portion and the inside part intercommunication of first connecting portion, offered the second gas outlet on the second connecting portion, the second gas outlet is located first gas outlet below, and the air current can follow the air inlet inflow along first direction, and the air current can follow first gas outlet and second gas outlet outflow along first direction. According to the invention, the main air flow is separated into two paths, the main air flow is blown out from the first air outlet, the auxiliary air flow is blown out from the second air outlet, a low-pressure backflow area below the main air flow is filled, smoke dust is prevented from being backflow and sucked to pollute the air outlet, a certain air flow power is provided for sputtered objects at the position, byproducts generated in the operation process are timely brought out of the range of a processing plane, and the cleanliness above a printing plane is ensured.
Description
Technical Field
The invention relates to the technical field of additive manufacturing, in particular to an airflow integration structure and 3D printing equipment.
Background
In 3D print jobs applied to metal additive manufacturing, the most easily influencing the quality of the molded part and print stability are the byproducts (splatter particles and fumes) generated by the laser during the print sintering process. Splash particles fall back to the printing breadth, and the molten pool morphology at the corresponding position is influenced when the next layer is printed, so that the printing face is raised, and the quality of a workpiece finished product is poor. In the working process, the oxygen content in the cavity is controlled in a mode of circulating inert gases such as high-purity nitrogen or argon to reduce the occurrence of byproducts, and meanwhile, the byproducts are blown away from the breadth range immediately after sputtering out by means of an inert circulating wind field which works stably to prevent the byproducts from falling back down to the powder bed to affect the next layer of printing. However, in the prior art, there are typically a suction port and a blowing port on two opposite side walls of the working chamber, respectively, where the blowing port has a certain height from the printing plane, and a backflow factor caused by the height will have a series of effects on the printing quality, and the blowing port is easily polluted or thermally deformed by backflow high-temperature smoke during long-term printing operation, and makes the floating smoke trapped in the backflow dead zone absorb laser energy to cause laser defocusing.
Disclosure of Invention
The invention solves the problem that the processing quality of the 3D printing workpiece is reduced due to the backflow factor.
In order to solve the above problems, in one aspect, the present invention provides an airflow integration structure, which includes a first connection portion and a second connection portion, wherein an interior of the first connection portion is hollow, and an air inlet and a first air outlet are formed on the first connection portion; the inside cavity of second connecting portion, just the inside of second connecting portion with the inside part intercommunication of first connecting portion, set up the second gas outlet on the second connecting portion, the second gas outlet is located first gas outlet below, the air current can follow the first direction follow the air inlet flows in, the air current can follow the first direction follow first gas outlet with the second gas outlet flows out.
Optionally, the airflow integration structure further includes a spacer installed in the first connection part, the spacer dividing the first connection part into a plurality of airflow channels along a second direction and a third direction, and the second direction and the third direction are perpendicular to the first direction, respectively.
Optionally, the spacer includes first baffle and second baffle, first baffle is followed the second direction is arranged in proper order, and is adjacent two first baffle parallel arrangement, the second baffle connect in first connecting portion with at least one in the first baffle, the second baffle is followed the third direction is arranged in proper order, the second baffle with first baffle is the contained angle setting.
Optionally, a ratio of a distance of the spacer to the air inlet to a distance of the air inlet to the first air outlet is 1 to 4, and a length of the spacer is greater than or equal to 60mm.
Optionally, the first connection portion is from the air inlet to the first air outlet, and the length of the first connection portion along the third direction is gradually increased.
Optionally, the second connecting portion includes straight section, straight section is located first connecting portion below, straight section with the contained angle between first connecting portion is 90, the second gas outlet is located straight section is kept away from the one end of first connecting portion.
Optionally, the second connecting portion further includes an arc segment, the arc segment is connected with the first connecting portion, the arc segment is located between the first connecting portion and the straight segment, and a ratio of a radius of the arc segment to a length of the airflow channel along the second direction is between 1:0.8 and 1:1.2.
Optionally, the second connection portion further includes a protrusion, the arc-shaped section is located between the protrusion and the straight section, an upper surface of the protrusion is parallel to the first direction, and a ratio of a length of the protrusion along the first direction to a length of the straight section along the first direction is between 1:0.75 and 1:1.
Optionally, the number of the second air outlets is several, and the second air outlets are uniformly arranged along the surface of the straight section.
On the other hand, the invention also provides 3D printing equipment, which comprises the airflow integration structure.
Compared with the prior art, the airflow integration structure provided by the embodiment of the invention has the beneficial effects that:
through dividing the air flow into two paths, blowing out the main air flow from the first air outlet along the first direction, blowing out the auxiliary air flow from the second air outlet of the second connecting part positioned below the first connecting part, filling the low-pressure backflow area below the main air flow, preventing smoke dust from flowing back and being sucked up to pollute the air blowing port, providing certain air flow power for sputtered materials at the position, and timely taking byproducts generated in the operation process out of the range of the processing plane, thereby guaranteeing the neatness degree above the printing plane.
Drawings
FIG. 1 is a schematic diagram of an integrated airflow structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of the whole structure of another embodiment of the airflow integration structure of the present invention;
FIG. 3 is a schematic view of the whole structure of another embodiment of the airflow integration structure of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 1A in accordance with the present invention;
FIG. 5 is an enlarged view of a portion of the invention at B in FIG. 3;
FIG. 6 is a schematic cross-sectional view of an embodiment of an airflow integration structure according to the invention;
FIG. 7 is a schematic view of an embodiment of an airflow integration structure according to the present invention;
FIG. 8 is a diagram of gas flow traces within the gas flow integration structure of the present invention;
FIG. 9 is a graph of gas flow trace within the gas flow integration structure of the present invention.
Reference numerals illustrate:
1-a first connection; 11-air inlet; 12-a first air outlet; 2-a second connection; 21-a second air outlet; 22-straight sections; 23-arc segments; 24-a boss; 3-spacers; 31-a first separator; 32-a second separator.
Description of the embodiments
The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly coupled, detachably coupled, or rotatably coupled; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The coordinate system XYZ is provided in the drawings of the embodiments of the present invention, in which the forward direction of the X axis represents the right direction, the reverse direction of the X axis represents the left direction, the forward direction of the Z axis represents the upper direction, the reverse direction of the Z axis represents the lower direction, the forward direction of the Y axis represents the front direction, and the reverse direction of the Y axis represents the rear direction, and the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", and "right", etc. are based on the directions or positional relationships shown in the drawings, only for convenience of description and simplification of description, but do not indicate or imply that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be construed as limiting the present invention.
The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
The metal 3D printing adopts a layer-by-layer processing mode, a workpiece is gradually processed from bottom to top, and the workpiece can be sequentially divided into a first layer, a second layer, a third layer and the like from bottom to top. A powder cylinder is arranged in a cavity of the 3D printing equipment, metal powder (generally aluminum alloy, stainless steel, aluminum and other metal powder) is filled in the powder cylinder, the powder cylinder can move from bottom to top, and the metal powder in the powder cylinder is pushed out to a certain height upwards. The scraper frame is located one side of powder jar, and the scraper frame is by the in-process that one side in the 3D printing apparatus cavity removed to the opposite side, and the scraper frame is released the metal powder of protrusion powder jar part by the powder jar to lay the plane of processing with the metal powder, the scraper frame resets, realizes from this that the first layer spreads the powder, is convenient for subsequent processing. The laser melts the metal powder at the appointed position according to the requirement, processes the appointed graph, after the processing is finished, the processing plane descends integrally, the powder cylinder pushes the metal powder in the powder cylinder upwards, the scraper rest moves from one side to the other side in the cavity of the 3D printing device, and the metal powder is paved on the processing plane to form a second layer. At this time, the laser can process the metal powder of the second layer correspondingly, and after the second layer is processed, the steps are repeated to process the third layer. Similarly, the fourth layer, fifth layer, etc. are consistent with the above processing flows, and will not be described here again.
In 3D printing jobs, in order to reduce byproducts generated during laser processing, 3D printing apparatuses often use a circulating inert gas introduced into the 3D printing apparatus to avoid oxidation reaction of metal powder with oxygen during laser processing. The circulating fan conveys inert circulating gas (usually adopting high-purity nitrogen or argon and the like) through the circular tube so as to control the oxygen content in the cavity of the 3D printing equipment, thereby reducing the generation of byproducts (splash particles and smoke dust) in the 3D printing process. Meanwhile, the splashing particles can be sucked away through the air blowing port and the air outlet which are positioned at the same height, so that the splashing particles are prevented from falling back to the printing plane, the next printing plane is raised, and the quality of the final finished workpiece cannot be guaranteed. Second, because the bump is too high, the doctor blade holder may be damaged by hitting the bump during movement, resulting in a suspension of the printing process.
As shown in fig. 1, 2, 8 and 9, an embodiment of the present invention provides an airflow integration structure, where the airflow integration structure includes a first connection portion 1 and a second connection portion 2, the first connection portion 1 is hollow, and an air inlet 11 and a first air outlet 12 are provided on the first connection portion 1; the second connecting portion 2 is hollow, the second connecting portion 2 is internally communicated with the inner portion of the first connecting portion 1, a second air outlet 21 is formed in the second connecting portion 2, the second air outlet 21 is located below the first air outlet 12, air flow can flow in from the air inlet 11 along a first direction, and air flow can flow out from the first air outlet 12 and the second air outlet 21 along the first direction.
In the traditional scheme, inert gas conveyed by a circulating fan is directly blown out from an air outlet, a certain distance exists between the air outlet and a processing plane of 3D printing equipment, and air flow gradually sinks after being blown out. And the part of the area between the air outlet and the processing breadth is not covered by the air flow at the position close to the air outlet. When the air flow is blown out from the air outlet, the partial area below the air outlet is in a low-pressure environment due to the flow velocity of the air flow, and smoke and dust are easily rewound and accumulated at the air flow, so that the processing quality at the air flow is reduced.
In this scheme, the inert gas sent by the circulating fan passes through the gas flow integration structure, the gas flow enters through the gas inlet 11 of the first connecting part 1, and is divided into two paths after entering the first connecting part 1, one path of gas flow is blown out from the first gas outlet 12 of the first connecting part 1, and the other path of gas flow is blown out from the second gas outlet 21 of the second connecting part 2. Wherein the primary air flow is blown out from the first air outlet 12, and the secondary air flow is blown out from the second air outlet 21. The main air flow and the auxiliary air flow are blown out along a first direction, and the first direction is the direction of the Y axis in FIG. 1. The lowest point of the second connecting part 2 is positioned above the processing plane, and a certain gap or interval is arranged between the lowest point and the processing plane.
By dividing the air flow into two paths and blowing out the main air flow from the first air outlet 12 along the first direction, the auxiliary air flow is blown out from the second air outlet 21 of the second connecting part 2 positioned below the first connecting part 1, filling the low-pressure backflow area below the main air flow, preventing smoke dust from being backflowed and sucked up to pollute the air outlet, providing certain air flow power for sputtered objects at the position, timely taking byproducts generated in the operation process out of the range of the processing plane, and guaranteeing the neatness degree above the printing plane.
As shown in fig. 1 to 3, the airflow integration structure further includes a spacer 3, the spacer 3 is installed in the first connection part 1, the spacer 3 partitions a plurality of airflow channels in the first connection part 1 along a second direction and a third direction, and the second direction and the third direction are perpendicular to the first direction, respectively.
Because inert gas is delivered by the circulating fan and then reaches the gas flow integration structure through a certain distance, in the process of gas flow transmission, the gas flow can generate non-uniformity and vortex characteristics due to factors such as bending of a pipeline, section change and the like (when the gas flow flows in the pipeline, the flowing direction of the gas flow is correspondingly changed due to the change of the shape of the pipeline, and when the flowing direction is changed, the gas flow is separated from the inner wall of the pipeline, so that the gas flow can generate spiral-like characteristics in the radial direction of the pipeline).
As shown in fig. 4 and 5, in one embodiment of the present invention, the spacer 3 includes a first partition 31 and a second partition 32, the first partition 31 is sequentially arranged along the second direction, the second direction is the direction of the Z-axis in fig. 1, two adjacent first partitions 31 are disposed in parallel, the second partition 32 is connected to at least one of the first connection portion and the first partition 31, the second partition 32 is sequentially arranged along the third direction, the third direction is the direction of the X-axis in fig. 1, and the second partition 32 and the first partition 31 are disposed at an included angle.
Alternatively, the number of the first partitions 31 is 2 to 3 to divide the inside of the first connecting portion 1 into 3 to 4 equal parts in the second direction; the number of the second partitions 32 is 11 to 15 to divide the inside of the first connecting portion 1 into 12 to 16 equal parts in the third direction. The number of the first partition plates 31 and the second partition plates 32 is mainly determined by the balance between the flow integration effect and the structural wind resistance control, and can be selected according to actual needs. When the number of the divided airflow channels is small, the internal style is too large, and the effect of integrating the flow is poor; when the number of the divided airflow channels is too large, the slender and excessive style can generate larger along-distance loss, the effectiveness of the wind speed of the printing plane is influenced, and the power requirement of the fan is more severe. The angle between the second separator 32 and the first separator 31 may be 45 °, 60 °, 90 °, etc., and preferably the angle between the second separator 32 and the first separator 31 is 90 °. The first partition plate 31 and the second partition plate 32 can be installed in the first connecting portion 1 in a bonding, welding or other mode, and can play a role in destroying the vortex characteristics of the air flow, so that the air flow flowing out of the first air outlet 12 and the second air outlet 21 is ensured to be uniform.
In another embodiment of the present invention, the spacer 3 may have a block structure, and a plurality of through holes may be formed in the spacer 3 so as to facilitate the air flow to pass therethrough, the axial direction of the through holes may be parallel to the Y-axis direction, and the through holes may be uniformly disposed along the surface of the spacer 3 so as to ensure that the air flow is blown to the processing plane in the Y-axis direction after passing through the spacer 3, and the Y-axis direction is parallel to the processing plane. The spacer 3 can be installed in the first connecting portion 1 in a mode of bolting, welding and the like, and can integrate the air flow conveyed from the upstream through a plurality of through holes formed in the spacer, so that the air flow non-uniformity and vortex characteristics caused by pipeline bending and section change in the upstream conveying process are corrected, and the air flow blown out from the first air outlet 12 and the second air outlet 21 is ensured to be uniform, so that the processing quality of subsequent workpieces is ensured.
As shown in fig. 2, 6 and 7, the ratio of the distance from the spacer 3 to the air inlet 11 to the distance from the air inlet 11 to the first air outlet 12 is 1 to 4, and the length of the spacer 3 is greater than or equal to 60mm. The length of the spacer 3 along the first direction is b, the length of the first connecting portion 1 along the first direction is f, the length b of the spacer 3 can be selected according to practical requirements, and the larger one of 0.75f and 60mm is generally selected. Too short a rectifying baffle does not provide sufficient integration to the air flow so that the air flow above the blowing plane may still have turbulence conditions affecting the uniformity of the blowing.
As shown in fig. 2, 6 and 7, the length of the first connection portion 1 in the third direction gradually increases from the air inlet 11 to the first air outlet 12.
The two sides of the airflow integration structure are required to be outwards opened by a certain angle, the angle ensures that the limit positions of the left side and the right side of the processing plane are covered by sufficient airflow, and the problem of wind power deficiency of the left side and the right side caused by the tendency of convergence towards the middle after the airflow is blown out is solved. Referring to fig. 7, the angle a is generally selected to be 8 ° to 12 °, and a smaller opening angle makes it impossible for the airflow to ensure that the far-end web can still cover the left and right sides completely, and an excessive opening angle makes the airflow cover too many ineffective areas, thereby reducing the utilization rate of the circulating air volume.
As shown in fig. 2 and 6, the second connection portion 2 includes a straight section 22, the straight section 22 is located below the first connection portion 1, an included angle between the straight section 22 and the first connection portion 1 is 90 °, and the second air outlet 21 is located at an end of the straight section 22 away from the first connection portion 1. By means of the straight section 22 arranged at 90 ° to the first connection 1, on the one hand, the auxiliary air flow is blown out without interfering with the main air flow; on the other hand, the auxiliary air flow can not pull the main air flow downwards during blowing.
The second connecting portion 2 further comprises an arc-shaped section 23, the arc-shaped section 23 is connected with the first connecting portion 1, the arc-shaped section 23 is located between the first connecting portion 1 and the flat section 22, and the ratio of the radius of the arc-shaped section 23 to the length of the airflow channel along the second direction is between 1:0.8 and 1:1.2.
By providing the arcuate segment 23, it is ensured that the auxiliary air flow reaches the straight segment 22 through the arcuate segment 23 with less loss. Secondly, the smaller radius of the arc-shaped section 23 is easy to cause the increase of flow passage loss, so that the auxiliary airflow flow is lower, and the supplementing effect on the low-pressure backflow area is poor; the radius of the arc-shaped section 23 is larger, so that the arc-shaped section is easy to interfere with the movement track of the scraper rest and other parts. The length of the air flow channel in said second direction is d, the radius of the arcuate segment 23 is c, and the radius c of the arcuate segment 23 is typically selected to be 0.8d to 1.2d.
As shown in fig. 2 and 6, the second connecting portion 2 further includes a protrusion 24, the arc-shaped section 23 is located between the protrusion 24 and the straight section 22, the upper surface of the protrusion 24 is parallel to the first direction, and the ratio of the length of the protrusion 24 along the first direction to the length of the straight section 22 along the first direction is between 1:0.75 and 1:1.
The length of the boss 24 in the first direction is e, the length of the straight section 22 in the first direction is g, and the length e is typically between 0.75g and 1 g. The bulge 24 plays a role in supporting the main air flow within a certain range, and slows down the downward attachment speed of the bulge so as to avoid the situation that the main air flow and the auxiliary air flow are attracted mutually, so that the function of the auxiliary air flow with low wind speed is damaged by the entrainment of the main air flow. If the length e is too small, the main air flow cannot be well supported, and the main air flow can be downwards guided by a turning corner in front of the auxiliary air flow cavity, so that the main air flow is more quickly downwards attached; the length e is longer, so that the main air flow is located at a higher height for a long time, the backflow area is enlarged, the auxiliary air flow supplementary backflow range is exceeded, and the auxiliary air flow supplementary backflow area effect is reduced.
As shown in fig. 1, the number of the second air outlets 21 is several, and the second air outlets 21 are uniformly arranged along the surface of the flat section 22. The second air outlet 21 may be a round hole or a square hole, so as to ensure that the triangular backflow structure between the main air flow and the lower substrate has more sufficient air flow supplement along the height, and generally small open pore diameters and multiple rows of distribution are selected, so that the uniformity of the auxiliary air flow blown out by the second air outlet 21 is ensured, and the aperture or side length of the second air outlet 21 is generally not more than 2mm.
A 3D printing apparatus according to another embodiment of the present invention includes the air flow integration structure as described above. The beneficial effects of the 3D printing device further include the beneficial effects of the airflow integration structure, which are not described herein.
Although the present application is disclosed above, the scope of protection of the present application is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the present application, and such changes and modifications would fall within the scope of the invention.
Claims (8)
1. An airflow integration structure, comprising:
the first connecting part is hollow, and is provided with an air inlet and a first air outlet;
the second connecting part is hollow, the inside of the second connecting part is communicated with the inside part of the first connecting part, a second air outlet is formed in the second connecting part, the second air outlet is positioned below the first air outlet, air flow can flow in from the air inlet along a first direction, and the air flow can flow out from the first air outlet and the second air outlet along the first direction;
a spacer installed in the first connection part, the spacer dividing a plurality of air flow passages in the first connection part in a second direction and a third direction;
the second connecting part comprises a straight section, the straight section is positioned below the first connecting part, and the second air outlet is positioned at one end of the straight section away from the first connecting part;
the second connecting part further comprises an arc-shaped section, the arc-shaped section is connected with the first connecting part, the arc-shaped section is positioned between the first connecting part and the straight section, and the ratio of the radius of the arc-shaped section to the length of the airflow channel along the second direction is between 1:0.8 and 1:1.2;
the second connecting portion further comprises a protruding portion, the arc-shaped section is located between the protruding portion and the straight section, the upper surface of the protruding portion is parallel to the first direction, and the ratio of the length of the protruding portion along the first direction to the length of the straight section along the first direction is between 1:0.75 and 1:1.
2. The airflow integration structure according to claim 1, wherein the second direction and the third direction are perpendicular to the first direction, respectively.
3. The airflow integration structure according to claim 2, wherein the spacer includes first partitions and second partitions, the first partitions are sequentially arranged along the second direction, two adjacent first partitions are arranged in parallel, the second partition is connected to at least one of the first connection portion and the first partition, the second partitions are sequentially arranged along the third direction, and the second partitions are disposed at an included angle with the first partitions.
4. The airflow integration structure according to claim 2, wherein a distance from the spacer to the air inlet
The ratio of the distance from the air inlet to the first air outlet is 1 to 4, and the length of the spacer is greater than or equal to 60mm.
5. The airflow integration structure according to claim 2, wherein the first connection portion gradually increases in length along the third direction from the air inlet to the first air outlet.
6. The airflow integration structure of claim 2, wherein an angle between said straight section and said first connection portion is 90 °.
7. The airflow integration structure according to claim 1, wherein the number of the second air outlets is plural, and the second air outlets are uniformly arranged along the surface of the straight section.
8. A 3D printing device comprising an air flow integration structure as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210196165.5A CN114713857B (en) | 2022-03-01 | 2022-03-01 | Air current integration structure and 3D printing apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210196165.5A CN114713857B (en) | 2022-03-01 | 2022-03-01 | Air current integration structure and 3D printing apparatus |
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| CN114713857A CN114713857A (en) | 2022-07-08 |
| CN114713857B true CN114713857B (en) | 2024-01-30 |
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| CN117840465A (en) * | 2024-03-08 | 2024-04-09 | 西安空天机电智能制造有限公司 | Wind field adjusting mechanism and additive manufacturing equipment |
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| CN106623928A (en) * | 2016-12-18 | 2017-05-10 | 北京工业大学 | Device for entering and exiting of shielding gas on two sides of forming bin of metal 3D printing equipment |
| WO2020041460A1 (en) * | 2018-08-21 | 2020-02-27 | General Electric Company | Spacer flow guide for partitioning build chamber of an additive manufacturing system |
| CN111912015A (en) * | 2020-07-16 | 2020-11-10 | 青岛海尔空调器有限总公司 | Vertical air conditioner indoor unit |
| CN113319296A (en) * | 2021-05-28 | 2021-08-31 | 威斯坦(厦门)实业有限公司 | Be applied to small-size 3D printer's exhaust guiding device and small-size 3D printer |
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|---|---|---|---|---|
| CN106623928A (en) * | 2016-12-18 | 2017-05-10 | 北京工业大学 | Device for entering and exiting of shielding gas on two sides of forming bin of metal 3D printing equipment |
| WO2020041460A1 (en) * | 2018-08-21 | 2020-02-27 | General Electric Company | Spacer flow guide for partitioning build chamber of an additive manufacturing system |
| CN111912015A (en) * | 2020-07-16 | 2020-11-10 | 青岛海尔空调器有限总公司 | Vertical air conditioner indoor unit |
| CN113319296A (en) * | 2021-05-28 | 2021-08-31 | 威斯坦(厦门)实业有限公司 | Be applied to small-size 3D printer's exhaust guiding device and small-size 3D printer |
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| CN114713857A (en) | 2022-07-08 |
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