Flow guide part, nozzle assembly and 3D printer

Abstract

The utility model provides a flow guide part, a nozzle assembly and a 3D printer, and belongs to the technical field of 3D printing. The flow guide part comprises a first heating section and a second heating section; in the axis direction of the flow guide part, the first heating section is provided with a first channel and a plurality of second channels which penetrate through the first heating section, and the second heating section is provided with a third channel and a plurality of fourth channels which penetrate through the second heating section; the plurality of second channels are arranged in the circumferential direction of the first channel and are respectively communicated with the first channel; the fourth channels are arranged in the circumferential direction of the third channel and communicate with the third channel. The aperture of the fourth channel is gradually increased from one end adjacent to the second channel to one end deviating from the second channel; the aperture of the third channel is gradually reduced from the end adjacent to the first channel to the end away from the first channel. According to the flow guide part provided by the invention, the inner core part and the peripheral part of the consumable are separated from each other, so that the heating uniformity of each part of the consumable and the heating efficiency of the consumable are improved.

Description

Technical Field

[0001] The present application relates to the field of 3D printing technology, and in particular to a flow guide, a nozzle assembly and a 3D printer. Background Art

[0002] As 3D printing technology becomes more and more mature, the speed of 3D printers is also constantly improving. In order to achieve high-speed and high-quality printing effects, traditional nozzle melting technology can no longer meet the needs of high-speed printing.

[0003] In the prior art, during the process of heating the consumables through the heating structure, the outer wall of the consumables can contact the heating structure to soften and melt the periphery of the consumables. Since the heating mechanism only contacts the periphery of the consumables, the heat can be transferred to the core only after the peripheral part of the consumables is heated, resulting in the softening speed of the core being much lower than the softening speed of the peripheral part, causing the peripheral part and the inner core part of the consumables to be heated unevenly, that is, the softening speeds of the core and the peripheral part of the consumables are quite different, resulting in poor melting effect on the core of the consumables, thereby resulting in poor printing effect and low printing efficiency. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a guide member, a nozzle assembly and a 3D printer, which can not only improve the uniformity of heating various parts of the consumables, but also improve the heating efficiency of the consumables.

[0005] In a first aspect, the present application provides a flow guide, comprising:

[0006] A first heating section and a second heating section are provided along the axis of the guide member, wherein the first heating section is provided with a first channel and a plurality of second channels passing through the first heating section, and the second heating section is provided with a third channel and a plurality of fourth channels passing through the second heating section;

[0007] A plurality of second channels are arranged in a circumferential direction of the first channel and are respectively communicated with the first channel;

[0008] A plurality of fourth channels are arranged in a circumferential direction of the third channel and are respectively communicated with the third channel;

[0009] The fourth channel is connected to the second channel, and the aperture of the fourth channel gradually increases from an end adjacent to the second channel to an end away from the second channel;

[0010] The third channel is connected to the first channel, and the aperture of the third channel gradually decreases from an end adjacent to the first channel to an end away from the first channel.

[0011] In some embodiments, the aperture of the third channel adjacent to one end of the first channel is smaller than the aperture of the first channel, and the aperture of the fourth channel adjacent to one end of the second channel is smaller than the aperture of the second channel, so as to form a step between the first heating section and the second heating section.

[0012] In some embodiments, there are three third channels and three fourth channels, and the axis of one fourth channel coincides with the axis of one second channel;

[0013] The distances between the axes of two adjacent fourth channels and the axis of the flow guide are equal, and the distances between any two axes of the three fourth channels are equal.

[0014] In some embodiments, the angle between the channel wall of the third channel and the channel wall of the fourth channel is α, wherein the value range of α is 1°≤α≤20°.

[0015] In some embodiments, a heat conducting rib is provided in the fourth channel, one end of the heat conducting rib is connected to the inner wall of the fourth channel, and the other end of the heat conducting rib faces the axis of the guide member.

[0016] In a second aspect, some embodiments of the present application provide a nozzle assembly, comprising a nozzle, a throat assembly, and the guide member described above;

[0017] The nozzle and the throat assembly are respectively arranged at two ends of the guide member in the axial direction;

[0018] The nozzle is provided with a merging flow channel communicating with the third channel and the fourth channel, and the throat assembly is provided with a throat channel communicating with the first channel and the second channel.

[0019] In some embodiments, the fusion channel includes a first flow guiding channel, a second flow guiding channel, and a third flow guiding channel that are connected in sequence;

[0020] The aperture of the second guide channel gradually decreases from an end adjacent to the first guide channel to an end away from the first guide channel;

[0021] The aperture of the third flow guiding channel is smaller than or equal to the aperture of the end of the second flow guiding channel away from the first flow guiding channel.

[0022] In some embodiments, the merging flow channel includes a fourth flow guiding channel connected to the first flow guiding channel, and the fourth flow guiding channel is arranged at an end of the first flow guiding channel away from the second flow guiding channel;

[0023] The aperture of the fourth guide channel gradually decreases from an end adjacent to the third channel to an end away from the third channel.

[0024] In some embodiments, the throat assembly includes a first connector, a throat, and a second connector;

[0025] The first connecting member and the second connecting member are respectively sleeved on both ends of the throat pipe, and the second connecting member is connected to an end of the first heating section away from the second heating section;

[0026] The throat pipe is communicated with the first passage and the second passage.

[0027] In a third aspect, the present application provides a 3D printer comprising the guide member or the nozzle assembly.

[0028] The embodiments of the present application have the following advantages: by arranging a plurality of spaced second channels in the circumferential direction of the first channel, the inner core part and the outer peripheral part of the consumable entering the first heating section are separated from each other by the first channel and the second channel, so that the inner core part of the consumable can contact the channel wall of the first channel, so as to heat the inner core part of the consumable through the channel wall of the first channel, thereby improving the softening efficiency of the inner core part of the consumable, and the outer peripheral part of the consumable enters the second channel and is heated by the channel wall of the second channel, thereby achieving simultaneous heating of the central part and the outer peripheral part of the consumable, which can not only improve the uniformity of heating of various parts of the consumable, but also improve the heating efficiency of the consumable rate, so that the consumables are softened evenly; by gradually reducing the aperture of the third channel from the end close to the first channel to the end away from the first channel, the consumables with higher thermal resistance are peeled off from the inner core part through the third channel, so that the channel wall of the third channel can better heat the inner core part of the consumables, thereby accelerating the melting of the inner core part of the consumables; by gradually increasing the aperture of the fourth channel from the end close to the second channel to the end away from the second channel, so that the fourth channel can accommodate the melted and softened consumables gradually peeled off through the channel wall of the third channel, not only the overall circulation resistance of the consumables is reduced, but also the efficiency of heating the consumables is improved, thereby improving the overall circulation speed and flow uniformity of the consumables.

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic structural diagram of a flow guide provided by some embodiments of the present application from one perspective is shown;

[0032] Figure 2 A schematic structural diagram showing another perspective of a flow guide provided by some embodiments of the present application is shown;

[0033] Figure 3 A schematic structural diagram showing another perspective of a flow guide provided by some embodiments of the present application;

[0034] Figure 4 A cross-sectional view from one perspective of a flow guide provided by some embodiments of the present application is shown;

[0035] Figure 5 A schematic structural diagram of a nozzle assembly provided by some embodiments of the present application from one perspective is shown;

[0036] Figure 6 An exploded view of a nozzle assembly provided by some embodiments of the present application is shown;

[0037] Figure 7 A cross-sectional view from a perspective of an embodiment of a nozzle assembly provided by some embodiments of the present application is shown;

[0038] Figure 8 A cross-sectional view from a perspective of another embodiment of a nozzle assembly provided by some embodiments of the present application is shown.

[0039] Description of main component symbols:

[0040] 100- flow guide; 110- first heating section; 111- first channel; 112- second channel; 120- second heating section; 121- third channel; 122- fourth channel; 130- step; 200- heat-conducting rib; 300- throat assembly; 310- throat channel; 320- first connecting piece; 330- throat; 340- second connecting piece; 400- nozzle; 410- fusion channel; 411- first flow guide channel; 412- second flow guide channel; 413- third flow guide channel; 414- fourth flow guide channel. DETAILED DESCRIPTION

[0041] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0042] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0043] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in the template description herein are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] like Figures 1 to 3 As shown, some embodiments of the present application provide a guide member 100, which is mainly used in a nozzle 400 assembly and a 3D printer to improve the uniformity and heating efficiency of the consumables flowing through the guide member 100, thereby increasing the flow speed of the consumables in the guide member 100.

[0047] The flow guide 100 includes a first heating section 110 and a second heating section 120 . The first heating section 110 and the second heating section 120 are integrally connected to form the flow guide 100 . The first heating section 110 is in communication with the second heating section 120 .

[0048] The shape of the flow guide 100 can be any one of cylindrical and polygonal, and can be specifically set according to actual conditions.

[0049] In this embodiment, the flow guide 100 is cylindrical as an example for detailed description. It is understood that the first heating section 110 and the second heating section 120 are both cylindrical in shape, and the axes of the first heating section 110, the second heating section 120 and the flow guide 100 coincide.

[0050] Along the axis of the flow guide 100, the first heating section 110 defines a first channel 111 and multiple second channels 112 extending through the first heating section 110. Furthermore, the second heating section 120 defines a third channel 121 and multiple fourth channels 122 extending through the second heating section 120. It is understood that the number of second channels 112 and the number of fourth flow guide channels 414 can each be any number, two or more, and can be set based on actual circumstances.

[0051] It should be noted that the axis of the first channel 111 and the axis of the second channel 112 are parallel to each other, the axis of the third channel 121 and the axis of the fourth channel 122 are parallel, and the axis of the first channel 111, the axis of the third channel 121 and the axis of the flow guide 100 coincide with each other.

[0052] The plurality of second channels 112 are arranged at intervals around the circumference of the first channel 111, and each second channel 112 is respectively connected to the first channel 111. It should be noted that by providing the plurality of second channels 112 at intervals around the circumference of the first channel 111, the heating area of the inner wall of the first heating section 110 is increased, thereby improving the heating efficiency and uniformity of the consumables when the consumables pass through the first channel 111 and the second channel 112.

[0053] It should be noted that, in this embodiment, the first heating section 110 is the preheating section of the guide member 100, that is, the consumables entering the first channel 111 and the second channel 112 are heated by the first heating section 110, so that this part of the consumables absorbs heat and softens, in preparation for the advancement and melting of the consumables.

[0054] Specifically, when the consumable enters the interior of the first heating section 110, the inner core part of the consumable enters the first channel 111, so that the inner core part of the consumable can contact the channel wall of the first channel 111, so as to heat the inner core part of the consumable through the channel wall of the first channel 111, thereby improving the softening efficiency of the inner core part of the consumable; the peripheral part of the consumable enters the second channel 112, and the consumable is heated through the channel wall of the second channel 112, thereby achieving simultaneous heating of the central part and the peripheral part of the consumable, which can not only improve the uniformity of heating of various parts of the consumable, but also improve the heating efficiency of the consumable, so that the consumable is evenly softened.

[0055] In this embodiment, one of the third channels 121 and one of the first channels 111 are connected, and the aperture of the third channel 121 gradually decreases from one end adjacent to the first channel 111 to the end away from the first channel 111, so that when the unmelted consumable passes through the first channel 111 and enters the third channel 121, the consumable fully contacts the channel wall of the third channel 121 to absorb heat during the movement of the third channel 121, and the softened and melted consumable is squeezed into the fourth channel 122 during the movement, thereby accelerating the melting of the consumable.

[0056] In addition, a plurality of the fourth channels 122 are arranged at intervals in the circumferential direction of the third channel 121, and each of the fourth channels 122 is respectively connected to the third channel 121. Specifically, one of the fourth channels 122 is connected to one of the second channels 112, and the aperture of the fourth channel 122 gradually increases from the end adjacent to the second channel 112 to the end away from the second channel 112. In this embodiment, the fourth channel 122 is tapered. As the amount of molten consumables passing through the third channel 121 increases, the fourth channel 122 can also accommodate more consumables. By gradually increasing the aperture of the fourth channel 122, the circulation pressure of the fourth channel 122 on the consumables is reduced, thereby being more conducive to the extrusion of the consumables from the fourth channel 122, thereby ensuring the stability and smoothness of the consumables flowing in the fourth channel 122.

[0057] Since the inner core of the consumable cannot directly contact the channel wall of the third channel 121 , the softening efficiency of the inner core of the consumable is low, resulting in uneven melting of the consumable, which affects the circulation speed of the consumable in the third channel 121 .

[0058] Based on this, the present application gradually reduces the aperture of the third channel 121 along the flow direction of the consumable, so that the peripheral part of the consumable can contact the channel wall of the third channel 121 to soften and melt, and then gradually peels off the consumable softened by the channel wall of the third channel 121 from the third channel 121 through the channel wall of the fourth channel 122, so that the inner core part of the consumable in the third channel 121 gradually contacts the channel wall of the third channel 121, so that the channel wall of the third channel 121 can directly contact the inner core part of the consumable to directly heat the inner core part of the consumable, which can not only improve the heating efficiency of the inner core part of the consumable, but also effectively improve the uniformity of heating the inner core part and the peripheral part of the consumable, thereby improving the stability and flow efficiency of the consumable flowing in the third channel 121 and the fourth channel 122.

[0059] It can be understood that in this embodiment, by gradually reducing the aperture of the third channel 121 from the end close to the first channel 111 to the end away from the first channel 111, the consumable with higher thermal resistance can be peeled off from the inner core part through the third channel 121, so that the channel wall of the third channel 121 can better heat the inner core part of the consumable, thereby accelerating the melting of the inner core part of the consumable; by gradually increasing the aperture of the fourth channel 122 from the end close to the second channel 112 to the end away from the second channel 112, so that the fourth channel 122 can accommodate the melted and softened consumable gradually peeled off through the channel wall of the third channel 121, not only the overall circulation resistance of the consumable is reduced, but also the efficiency of heating the consumable is improved, thereby improving the overall circulation speed and flow uniformity of the consumable.

[0060] It should be noted that due to the low thermal conductivity of the consumable, when the consumable passes through the second heating section 120, as the passing distance increases, the consumable absorbs more heat, the volume of the area of the outer peripheral part of the consumable that is heated and softened gradually increases (the cross-sectional area increases), and the area of the inner core part close to the core shaft of the consumable that is not softened gradually decreases (the cross-sectional area decreases).

[0061] In the present application, the aperture of the fourth channel 122 is gradually increased along the flow direction of the consumable, and the aperture of the third channel 121 is gradually decreased along the flow direction of the consumable, so that during the flow of the consumable in the fourth channel 122, the fourth channel 122 can gradually accommodate more heated and softened consumables, thereby complying with the state change law of the peripheral part of the consumable after being heated, thereby improving the smoothness and stability of the flow of the consumable in the third channel 121 and the fourth channel 122.

[0062] like Figure 3 and Figure 4 As shown, in some embodiments of the present application, the aperture of one end of the third channel 121 adjacent to the first channel 111 is smaller than the aperture of the first channel 111 , so as to form a first step 130 between the third channel 121 and the first channel 111 .

[0063] In addition, the aperture of the fourth channel 122 at one end adjacent to the second channel 112 is smaller than the aperture of the second channel 112, so as to form a second step 130 between the fourth channel 122 and the second channel 112, and the first step 130 and the second step 130 are connected end to end to form a step 130 between the first heating section 110 and the second heating section 120.

[0064] It should be noted that, by setting the step 130, when the consumable enters the second heating section 120 from the first heating section 110, the step 130 surface of the step difference will peel off the softened consumable at the inner core of the consumable. Since the feed end of the third channel 121 is larger and the feed end of the fourth channel 122 is smaller, after the third channel 121 and the fourth channel 122 are connected, the effective peeling circumference (non-gap area on the circumference) of the consumable by the third channel 121 is larger, accounting for more than 1 / 2 of its circumference, thereby avoiding the situation where the outer layer of the consumable only contacts the convex area (the effective peeling circumference of the third channel 121 is smaller, accounting for less than 1 / 3 of its circumference) when the consumable enters the third channel 121 and the fourth channel 122, and the outer layer of the consumable to be peeled is limited.

[0065] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, there are three second channels 112 and three fourth channels 122, and the axis of one fourth channel 122 coincides with the axis of one second channel 112, so as to improve the uniformity of the softening degree of the consumables entering the fourth channel 122 from the second channel 112, thereby ensuring the uniformity of heating of the consumables by the channel wall entering the fourth channel 122.

[0066] Among them, the distances between the axes of two adjacent fourth channels 122 and the axis of the guide member 100 are equal, and the distances between any two axes of the three fourth channels 122 are equal, so that multiple fourth channels 122 are arranged at equal intervals on the periphery of the third channel 121, thereby ensuring the uniformity of the peeling of the softened and melted consumables in the third channel 121 by the channel wall of the fourth channel 122, thereby improving the heating efficiency of the third channel 121 on the inner core part of the consumables.

[0067] In addition, it should be noted that by aligning the axis of the first channel 111 with the axis of the third channel 121, the degree of softening of the peripheral part of the consumables entering the third channel 121 through the first channel 111 and the second channel 112 is uniform, thereby ensuring the uniformity of heating of the consumables by the channel wall of the third channel 121.

[0068] like Figure 2 and Figure 3 As shown, in some embodiments of the present application, a thermal rib 200 is provided in the fourth channel 122, one end of the thermal rib 200 is connected to the inner wall of the fourth channel 122, and the other end of the thermal rib 200 is directed toward the axis of the guide member 100, so that the fourth channel 122 is separated by the thermal rib 200 to form two symmetrical guide spaces, so that the outer wall surface of the thermal rib 200 can contact the consumables entering the fourth channel 122, thereby transferring the heat of the thermal rib 200 to the consumables, so as to heat and melt the consumables, thereby improving the heating efficiency of the consumables.

[0069] Specifically, the length of the thermal ribs 200 is parallel to the axis of the fourth channel 122, and the length of the thermal ribs 200 is equal to the length of the fourth channel 122, so that the portion of the consumables flowing through the fourth channel 122 can always contact the thermal ribs 200, thereby further heating the consumables through the thermal ribs 200. It can be understood that by providing the thermal ribs 200 in the fourth channel 122, the effective heating area of the fourth channel 122 for the consumables is increased, thereby improving the heating efficiency and melting efficiency of the consumables and improving the uniformity of the heating of the consumables.

[0070] In some embodiments, the angle α between the channel wall of the third channel 121 and the channel wall of the fourth channel 122 is 1°≤α≤20°. It is understood that the value range of α includes one of 1°≤α≤20°, 2°≤α≤20°, 3°≤α≤20°, 4°≤α≤20°, 5°≤α≤20°, 6°≤α≤20°, 7°≤α≤20°, 8°≤α≤20°, 9°≤α≤20°, 10°≤α≤20°, 11°≤α≤20°, 12°≤α≤20°, 13°≤α≤20°, 14°≤α≤20°, 15°≤α≤20°, 16°≤α≤20°, 17°≤α≤20°, 18°≤α≤20°, and 19°≤α≤20°, and can be specifically set according to actual conditions.

[0071] It should be noted that by controlling the value range of the angle α, the inner wall of the third channel 121 is always close to the critical surface of the softening of the periphery of the consumable, thereby further improving the heating efficiency of the inner core part of the consumable. At the same time, the wall of the third channel 121 squeezes the softened consumable into the fourth channel 122. The radially gradually increasing structure of the fourth channel 122 is conducive to accommodating the gradually increasing softened consumable, thereby improving the smoothness of the flow of the consumable in the third channel 121 and the fourth channel 122.

[0072] In addition, in this embodiment, the apertures of the third channel 121 and the fourth channel 122 can be specifically set according to the diameter of the consumable. For example, if the consumable diameter is 1.75 mm, the aperture of the third channel 121 adjacent to the first channel 111 ranges from 1 to 1.75 mm, and the aperture of the third channel 121 facing away from the first channel 111 ranges from 0.5 to 1 mm. The aperture of the fourth channel 122 adjacent to the second channel 112 ranges from 0 to 1 mm, and the aperture of the fourth channel 122 facing away from the second channel 112 ranges from 1 to 1.75 mm.

[0073] like Figures 5 to 8As shown, some embodiments of the present application further provide a nozzle 400 assembly, comprising a nozzle 400, a throat assembly 300, and the flow guide 100 described in any one of the above embodiments.

[0074] Among them, the nozzle 400 and the throat pipe assembly 300 are respectively arranged at the two ends of the axial direction of the guide member 100, and the nozzle 400 and the throat pipe assembly 300 are respectively connected to the guide member 100, so that the consumables can enter the guide member 100 through the throat pipe assembly 300, and the consumables are heated and melted by the guide member 100 and then sprayed out from the nozzle 400.

[0075] In addition, the nozzle 400 is provided with a fusion channel 410 connecting the third channel 121 and the fourth channel 122, and the throat assembly 300 is provided with a throat channel 310 connecting the first channel 111 and the second channel 112, so that the consumable can be pushed into the throat channel 310 under the action of external force, and the consumable in the throat channel 310 is pushed into the first channel 111 and the second channel 112 under the action of external force; after the consumable is preliminarily heated (i.e., preheated) by the channel wall of the first channel 111 and the channel wall of the second channel 112, the consumable absorbs heat and softens, so as to facilitate the advancement of the consumable and prepare for further melting. The consumable material that has been preheated and softened by the first channel 111 and the second channel 112 enters the third channel 121 and the fourth channel 122, and is further heated by the channel wall of the third channel 121 and the channel wall of the fourth channel 122, so that the consumable material is evenly melted and enters the fusion channel 410, and the completely melted consumable material is extruded from the discharge end of the fusion channel 410.

[0076] like Figure 7 As shown, in some embodiments of the present application, the merging flow channel 410 includes a first flow guiding channel 411, a second flow guiding channel 412, and a third flow guiding channel 413 that are connected in sequence. The axes of the first flow guiding channel 411, the second flow guiding channel 412, and the third flow guiding channel 413 coincide with each other, and the axis of the merging flow channel 410 coincides with the axis of the flow guide 100.

[0077] Among them, the aperture of the second guide channel 412 gradually decreases from one end adjacent to the first guide channel 411 to the end away from the first guide channel 411, so as to reduce the outer diameter of the consumable material entering the third guide channel 413 through the second guide channel 412, and the aperture of the third guide channel 413 is less than or equal to the aperture of the end of the second guide channel 412 away from the first guide channel 411, so as to control the coarseness of the consumable material ejected from the nozzle 400 through the third guide channel 413 to meet printing requirements.

[0078] In addition, it can be understood that by gradually reducing the aperture of the second guide channel 412, if the propulsion speed of the consumables in the second guide channel 412 is maintained at a preset value, the ejection speed of the consumables through the third guide channel 413 is greater than the flow speed in the second guide channel 412, thereby improving the printing speed and printing efficiency.

[0079] It should be noted that the radius of the first guide channel 411 is smaller than the distance between the side of the channel wall of the fourth channel 122 facing the axis of the third channel 121 and the axis of the third channel 121, so as to avoid the appearance of gaps in the first guide channel 411 and ensure the stability of the consumables after melting through the third channel 121 and the fourth channel 122 and entering the first guide channel 411.

[0080] like Figure 8 As shown, in some embodiments of the present application, the merging channel 410 includes a fourth guide channel 414 connected to the first guide channel 411 , and the fourth guide channel 414 is arranged at an end of the first guide channel 411 away from the second guide channel 412 .

[0081] Among them, the axis of the fourth guide channel 414 coincides with the axis of the first guide channel 411, and the aperture of the fourth guide channel 414 gradually decreases from one end adjacent to the third channel 121 to the end away from the third channel 121, so that when the consumables melted by the guide member 100 enter the fourth guide channel 414, not only can the flow speed of the consumables in the fourth guide channel 414 gradually increase, but also the outer diameter of the consumables can be preliminarily adjusted to prepare for the subsequent adjustment of the outer diameter of the consumables when ejected.

[0082] It should be noted that the radius of the end of the fourth guide channel 414 adjacent to the third channel 121 is smaller than the distance between the side of the channel wall of the fourth channel 122 facing the axis of the third channel 121 and the axis of the third channel 121, thereby avoiding the formation of gaps in the first guide channel 411 and ensuring the stability of the consumables entering the first guide channel 411 after being melted through the third channel 121 and the fourth channel 122. In addition, the diameter of the end of the fourth guide channel 414 connected to the first guide channel 411 is equal to the diameter of the first guide channel 411 to ensure the stability of the flow rate of the consumables in the first guide channel 411.

[0083] like Figures 5 to 8 As shown, in some embodiments of the present application, the throat assembly 300 includes a first connecting member 320 , a throat 330 and a second connecting member 340 .

[0084] Specifically, the first connecting member 320 and the second connecting member 340 are tubular structures respectively. The first connecting member 320 and the second connecting member 340 are respectively arranged on both ends of the throat 330, and the second connecting member 340 is connected to the end of the first heating section 110 away from the second heating section 120 to connect the throat assembly 300 with the guide member 100.

[0085] It should be noted that the axis of the throat pipe assembly 300 coincides with the axis of the guide member 100, and the channel inside the throat pipe 330 is connected to the first channel 111 and the second channel 112, so as to provide a guiding effect on the consumables through the throat pipe 330, so that the external consumables can be pushed into the first channel 111 and the second channel 112 through the channel inside the throat pipe 330 under the action of external force.

[0086] It should be noted that the present application, by gradually reducing the aperture of the third channel 121 of the second heating section 120 and gradually increasing the aperture of the fourth channel 122, not only facilitates the peeling of the melted consumables, but also improves the melting efficiency of the inner core portion of the consumables and improves the uniformity of heating and melting the consumables, thereby increasing the temperature of the consumables at the outlet of the nozzle 400 from 117 degrees to 127 degrees. It can be understood that the higher the outlet temperature, the higher the heating efficiency, that is, the heating efficiency is improved by 8%. The higher the outlet temperature of the consumables at the nozzle 400, the better the fluidity of the consumables, thereby reducing the inlet pressure of the consumables at the nozzle 400. The lower the inlet pressure, the smaller the resistance of the consumables during the advancement process, which is more conducive to increasing the volume flow rate of the consumables at the outlet of the nozzle 400, thereby achieving rapid discharge of the consumables and further achieving high-speed 3D printing.

[0087] In addition, some embodiments of the present application further provide a 3D printer, comprising the guide member 100 described in any one of the above embodiments or the nozzle 400 assembly described in any one of the above embodiments.

[0088] The 3D printer has the structure of the guide member 100 described in any of the above embodiments and the beneficial effects produced therefrom; or the 3D printer has the structure of the nozzle 400 assembly described in any of the above embodiments and the beneficial effects produced therefrom, which will not be described one by one here.

[0089] In all examples shown and described herein, any specific values should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0090] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0091] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person skilled in the art may make various modifications and improvements without departing from the scope of the present application, and such modifications and improvements are all within the scope of protection of the present application.

Claims

1. A flow guide, characterized in that: include: A first heating section and a second heating section are provided along the axis of the guide member, wherein the first heating section is provided with a first channel and a plurality of second channels passing through the first heating section, and the second heating section is provided with a third channel and a plurality of fourth channels passing through the second heating section; A plurality of second channels are arranged in a circumferential direction of the first channel and are respectively communicated with the first channel; A plurality of fourth channels are arranged in a circumferential direction of the third channel and are respectively communicated with the third channel; The fourth channel is connected to the second channel, and the aperture of the fourth channel gradually increases from an end adjacent to the second channel to an end away from the second channel; The third channel is connected to the first channel, and the aperture of the third channel gradually decreases from an end adjacent to the first channel to an end away from the first channel.

2. The flow guide according to claim 1, characterized in that: The aperture of the third channel adjacent to one end of the first channel is smaller than that of the first channel, and the aperture of the fourth channel adjacent to one end of the second channel is smaller than that of the second channel, so as to form a step between the first heating section and the second heating section.

3. The flow guide according to claim 1, characterized in that: There are three third channels and three fourth channels, and the axis of one fourth channel coincides with the axis of one second channel; The distances between the axes of two adjacent fourth channels and the axis of the flow guide are equal, and the distances between any two axes of the three fourth channels are equal.

4. The flow guide according to any one of claims 1 to 3, characterized in that: The angle between the channel wall of the third channel and the channel wall of the fourth channel is α, wherein the value range of α is 1°≤α≤20°.

5. The flow guide according to claim 4, characterized in that: A heat conducting rib is provided in the fourth channel, one end of the heat conducting rib is connected to the inner wall of the fourth channel, and the other end of the heat conducting rib faces the axis of the flow guide.

6. A nozzle assembly, characterized in that: A device comprising a nozzle, a throat assembly and a flow guide according to any one of claims 1 to 5; The nozzle and the throat assembly are respectively arranged at two ends of the guide member in the axial direction; The nozzle is provided with a merging flow channel communicating with the third channel and the fourth channel, and the throat assembly is provided with a throat channel communicating with the first channel and the second channel.

7. The nozzle assembly according to claim 6, wherein: The fusion channel includes a first flow guiding channel, a second flow guiding channel and a third flow guiding channel which are connected in sequence; The aperture of the second guide channel gradually decreases from an end adjacent to the first guide channel to an end away from the first guide channel; The aperture of the third flow guiding channel is smaller than or equal to the aperture of the end of the second flow guiding channel away from the first flow guiding channel.

8. The nozzle assembly according to claim 7, wherein: The merging flow channel includes a fourth flow guiding channel connected to the first flow guiding channel, and the fourth flow guiding channel is arranged at an end of the first flow guiding channel away from the second flow guiding channel; The aperture of the fourth guide channel gradually decreases from an end adjacent to the third channel to an end away from the third channel.

9. The nozzle assembly according to claim 6, wherein: The throat assembly includes a first connecting piece, a throat and a second connecting piece; The first connecting member and the second connecting member are respectively sleeved on both ends of the throat pipe, and the second connecting member is connected to an end of the first heating section away from the second heating section; The throat pipe is communicated with the first passage and the second passage.

10. A 3D printer, characterized in that: The invention comprises the flow guide member according to any one of claims 1 to 5 or the nozzle assembly according to any one of claims 6 to 9.

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