3D printing apparatus

Abstract

A 3D printing apparatus, comprising a housing, a heated print bed, a tool head and an air intake damper mechanism, wherein a working cavity is formed in the housing, and the heated print bed and / or the tool head are / is movably arranged in the working cavity; the air intake damper mechanism is arranged on the housing and defines an air intake channel, and / or the air intake damper mechanism and the housing form an air intake channel, and the air intake channel is in communication with the working cavity; the air intake channel has an air outlet, an airflow in the air intake channel can enter the working cavity via the air outlet, and the air outlet is arranged above the heated print bed; and the air intake damper mechanism is configured to open and close the air intake channel to control the air inflow into the working cavity. In the technical solution of the present application, the air outlet is arranged above the heated print bed, such that the airflow blown out from the air outlet can directly come into contact with a print model above the heated print bed, thereby reducing the interference of a transmission mechanism below the heated print bed or other electronic components below the heated print bed on the air intake of the air intake channel, reducing air path turbulence, and improving the exhaust efficiency of the 3D printing apparatus.

Description

3D printing equipment

[0001] This application claims priority to Chinese Patent Application No. 2025100650597, filed on January 15, 2025, entitled “3D Printing Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of 3D printing technology, specifically to a 3D printing device. Background Technology

[0003] With the continuous development of 3D printing technology, the application fields of 3D printing equipment have gradually expanded to many aspects such as industrial manufacturing, medical devices, and construction. To ensure the printing effect of 3D printing equipment, an air duct is usually set up in the working chamber of the 3D printing equipment. The 3D printing equipment can exhaust the waste gas and heat generated in the working chamber through the air duct, thereby ensuring the smooth progress of the printing process.

[0004] However, the air duct structure design of 3D printing equipment in related technologies is unreasonable, resulting in poor exhaust performance of the 3D printing equipment. Summary of the Invention

[0005] The purpose of this application is to provide a 3D printing device that aims to solve the problem of poor ventilation in 3D printing devices in related technologies.

[0006] To achieve the purpose of this application, in a first aspect, this application provides a 3D printing device, the 3D printing device including a housing, a heated bed, a tool head and an air intake damper mechanism, the housing forming a working cavity, the heated bed and / or the tool head being movably disposed within the working cavity;

[0007] The air intake damper mechanism is disposed on the housing, the air intake damper mechanism forms an air intake channel, and / or the air intake damper mechanism and the housing form an air intake channel, the air intake channel being connected to the working chamber;

[0008] The air intake channel has an air outlet, through which the airflow can enter the working chamber. The air outlet is located above the heated bed. The air intake damper mechanism is used to open and close the air intake channel to control the flow of gas into the working chamber.

[0009] In one possible implementation, the heated bed has a bearing surface for supporting the printed model;

[0010] The housing includes a top plate and a plurality of side plates disposed around the outer edge of the top plate; the top plate is disposed opposite to the bearing surface;

[0011] The top plate and each of the side plates form a closed cavity for the working chamber. One of the side plates is set as an open plate, which is provided with an opening for the printing model to enter and exit and a door plate to close the opening.

[0012] The air intake channel also has an air inlet, through which airflow from outside the 3D printing equipment can enter the air intake channel. The air inlet is located on one side of the top plate and / or one side of the open plate.

[0013] In one possible implementation, the top plate and the open plate have intersecting lines, and the air outlet is configured as a strip or an array of strips;

[0014] The length direction of the air outlet is parallel to the intersecting line.

[0015] In one possible implementation, the intake damper mechanism includes:

[0016] A damper frame, which is connected to the housing, and the air intake passage portion is disposed on the damper frame;

[0017] An air intake damper is movably mounted on the damper frame or the housing.

[0018] An intake drive assembly is used to drive the intake damper to open or close the intake passage.

[0019] In one possible implementation, the air intake damper is connected to the damper frame or the housing via a rotating shaft. The air intake damper includes a rotating side and a closed side disposed opposite to each other. The rotating side is disposed close to the rotating shaft. When the air intake damper is closed, the closed side is closer to the center of the heated bed than the rotating side.

[0020] In one possible implementation, the air intake damper has a closed position and an open position. When the air intake damper is in the closed position, it blocks the air intake passage. When the air intake damper is in the open position, the closed side is located outside the housing and the air intake passage is opened.

[0021] During the rotation between the open and closed positions, the rotation angle of the air intake damper is A, where A satisfies: 20°≤A≤45°.

[0022] In one possible implementation, the air intake damper is connected to the damper frame or the housing via a rotating shaft. The air intake damper includes a rotating side and a closed side disposed opposite to each other. The rotating side is disposed close to the rotating shaft, and a groove is provided between the rotating side and the closed side.

[0023] The intake drive assembly includes a drive member and a drive rod. The drive member has a rotating part. One end of the drive rod is drivenly connected to the rotating part, and the other end of the drive rod is slidably disposed in the groove.

[0024] In one possible implementation, the drive rod includes a main rod portion, a sliding portion, and a limiting portion; the main rod portion includes a first end and a second end disposed opposite to each other; the first end is connected to the drive member;

[0025] The sliding part is connected to the second end. The sliding part is slidably disposed in the slide groove. When the sliding part slides to the slide groove near the rotating side, the air intake damper is in the open position. When the sliding part slides to the slide groove near the closed side, the air intake damper is in the closed position.

[0026] The sliding part includes a first shaft segment and a second shaft segment connected to each other. The first shaft segment is slidably disposed in the slide groove, and the second shaft segment protrudes out of the slide groove along the side of the first shaft segment away from the main rod. The limiting part is disposed on the second shaft segment and is used to cooperate with the main rod to engage the sliding part in the slide groove.

[0027] In one possible implementation, the air intake channel further has an air inlet, through which airflow from outside the 3D printing equipment can enter the air intake channel. The air inlet is rectangular. The length of the air inlet is B1, and the width is B2, satisfying: 1 / 100≤B2 / B1≤1 / 5. The length direction of the air inlet is parallel to the heated bed plane.

[0028] In one possible implementation, the angle between the axis of the air inlet and the axis of the air outlet is C, where 40°≤C≤90°.

[0029] In one possible implementation, the 3D printing equipment further includes an exhaust mechanism disposed within the working chamber, the exhaust mechanism being used to discharge gas from the working chamber to the outside of the working chamber or to circulate gas within the working chamber;

[0030] The exhaust mechanism is provided with an air inlet, through which the gas in the working chamber flows into the exhaust mechanism. The air inlet is positioned facing the air outlet, or the air inlet is located on the side of the exhaust mechanism facing the air outlet.

[0031] In one possible implementation, the line connecting the shape center of the air inlet and the shape center of the air outlet is a first straight line, which is at least partially located above the heated bed, wherein the heated bed has a bearing surface for supporting the printed model, and the heated bed is movable in a direction perpendicular to the bearing surface.

[0032] In one possible implementation, the tool head has a nozzle for ejecting deposited molten material, the displacement plane of the nozzle being a reference plane parallel to the bearing surface of the heated bed; a line perpendicular to the heated bed and passing through the center of the heated bed shape is a reference line; the reference line intersects the reference plane at a reference point.

[0033] The line connecting the shape center of the air outlet and the reference point is the second straight line, and the angle between the first straight line and the second straight line is D, satisfying: 0°≤D≤20°.

[0034] In one possible implementation, the exhaust mechanism includes a support frame and a filter element; the air inlet is located on the support frame;

[0035] The support frame also forms an air inlet chamber and an air outlet chamber that are connected to the air inlet. The gas in the working chamber enters the air outlet chamber through the air inlet and the air inlet chamber, and is discharged outside the working chamber through the air outlet chamber or flows back into the working chamber.

[0036] The air inlet includes a direct air inlet and a filter air inlet; the filter element is disposed in the air inlet cavity and is arranged corresponding to the filter air inlet;

[0037] The direct exhaust air inlet is closer to the tool head than the filter air inlet, and the line connecting the shape center of the direct exhaust air inlet and the shape center of the air outlet is at least partially located above the heated bed.

[0038] In one possible implementation, the housing includes a top plate disposed opposite to the bearing surface;

[0039] The exhaust mechanism has a top surface near the top plate and a bottom surface away from the top plate, and the air inlet is located near the top surface; and / or, the distance between the top of the exhaust mechanism and the top plate is greater than the distance between the tool head and the top plate.

[0040] The technical solution of this application places the air outlet above the heated bed, so that the airflow blown out of the air outlet can directly contact the printed model above the heated bed, thereby reducing the interference of the transmission mechanism or other electronic components below the heated bed on the air intake channel, reducing airflow turbulence, optimizing the air duct structure of the 3D printing equipment, and improving the exhaust efficiency of the 3D printing equipment. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0042] Figure 1 is a cross-sectional view of an embodiment of the 3D printing equipment provided in this application;

[0043] Figure 2 is a schematic diagram of the three-dimensional structure of Figure 1;

[0044] Figure 3 is a cross-sectional view of Figure 1 from another perspective;

[0045] Figure 4 is a magnified view of a portion of Figure 2 at point a;

[0046] Figure 5 is a schematic diagram of the air inlet in Figure 1;

[0047] Figure 6 is a three-dimensional structural diagram of the intake damper mechanism in Figure 1;

[0048] Figure 7 is a cross-sectional view of Figure 6;

[0049] Figure 8 is a schematic diagram of the intake drive assembly in Figure 6;

[0050] Figure 9 is a magnified view of part b in Figure 6;

[0051] Figure 10 is a cross-sectional view of the 3D printing equipment after the hidden part of the structure in Figure 1 is shown.

[0052] Figure 11 is a cross-sectional view of the exhaust mechanism in Figure 1;

[0053] Figure 12 is a schematic diagram of the airflow path of the straight exhaust airflow in Figure 1;

[0054] Figure 13 is a schematic diagram of the airflow path of the filtered exhaust air in Figure 1;

[0055] Figure 14 is an exploded view of the support frame in Figure 11;

[0056] Figure 15 is a structural schematic diagram of another embodiment of the air intake baffle in Figure 14;

[0057] Figure 16 is a partial schematic diagram of the filter air inlet cavity in Figure 11;

[0058] Figure 17 is a schematic diagram of the airflow path of the straight-through circulating airflow in Figure 1;

[0059] Figure 18 is a schematic diagram of the airflow path of the filter circulation airflow in Figure 1;

[0060] Figure 19 is a schematic diagram of the airflow at the exhaust mechanism in Figure 1, showing the direct-flow circulating airflow path.

[0061] Figure 20 is a schematic diagram of the internal and external damper drive assembly in Figure 11;

[0062] Figure 21 is a schematic diagram of the damper drive component in Figure 20;

[0063] Figure 22 is a structural schematic diagram of Figure 21 from another perspective;

[0064] Figure 23 is a schematic diagram of the airflow path at the exhaust mechanism in Figure 1;

[0065] Figure 24 is a schematic diagram of the filter-to-direct switching damper assembly in Figure 11;

[0066] Figure 25 is a schematic diagram of the assembly of the filter-to-direct switching damper and the partition plate in Figure 11;

[0067] Figure 26 is a schematic diagram of the partition plate in Figure 25;

[0068] Figure 27 is a magnified view of a portion of Figure 26 at point c;

[0069] Figure 28 is a magnified view of a portion of Figure 26 at point d.

[0070] Explanation of reference numerals in the attached drawings: 1000-3D printing equipment; 100-exhaust mechanism; 1-support frame, 11-support plate, 111-partition plate, 1112-direct exhaust vent, 1113-filtered exhaust vent, 1114-return vent, 1115-main body surface, 1116-connecting surface, 1117-baffle surface, 1118-first through groove, 1119-second through groove, 1120-groove, 112-fixed plate, 1121-exhaust vent, 12-intake baffle, 121-intake plate, 1211-intake port, 12111-direct exhaust inlet, 12112-filtered air inlet, 122-partition plate, 13-intake chamber, 131-direct exhaust inlet chamber, 132-filtered air inlet chamber, 14-exhaust chamber; 2-direct exhaust fan; 3-circulating fan; 4-Filter element, 41-First filter surface, 42-Second filter surface, 43-Side surface, 44-Sealing element; 5-Filter-to-direction switching damper assembly, 51-Filter-to-direction switching damper, 52-Filter-to-direction drive component, 5201-Filter-to-direction rack, 5202-Filter-to-direction drive component, 5203-Filter-to-direction damper drive gear; 6-Inner damper, 61-Mounting groove; 7-Outer damper; 8-Inner and outer damper drive assembly, 81-Linkage component, 82-Outer damper connecting rod, 83-Inner damper connecting rod, 84-Damper drive component, 841-Linkage rack, 842-Damper drive component, 843-Inner and outer damper drive gear; 9-Electrical compartment; 10-Heating element; 200-Shell, 210-Top plate, 220-Side plate, 220a-Open plate, 230-Bottom plate, 240-Working chamber; 300-Heated bed, 310-Bearing surface; 400-Tool head, 410-Nozzle; 500-Intake damper mechanism, 510-Damper frame, 520-Intake damper, 521-Slide groove, 522-Rotating side, 523-Closed side, 530-Intake drive assembly, 531-Drive component, 532-Drive rod, 5321-Main rod section, 5322-Sliding section, 53221-First shaft section, 53222-Second shaft section, 540-Rotating shaft, 5323-Limiting part; 600 - Air duct, 610 - Air intake channel, 611 - Air inlet, 612 - Air outlet, 620 - Exhaust channel, 621 - First chamber section, 622 - Second chamber section, 600a - Exhaust airflow path, 610a - Direct exhaust airflow path, 620a - Filtered exhaust airflow path, 600b - Circulating airflow path, 610b - Direct circulating airflow path, 620b - Filtered circulating airflow path. Detailed Implementation

[0071] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0072] It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or it can be in a middle component. When a component is said to be "connected" to another component, it can be directly connected to the other component or it may be in a middle component.

[0073] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0074] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0075] Referring to Figures 1 and 2, this application proposes a 3D printing device 1000. In one embodiment of this application, the 3D printing device 1000 includes a housing 200, a tool head 400, and a heated bed 300. The housing 200 serves as the main structural component of the 3D printing device 1000, supporting and connecting the various component assemblies of the 3D printing device 1000. The housing 200 has a working cavity 240 for 3D printing, within which the heated bed 300 and the tool head 400 are movably disposed.

[0076] The shape of the housing 200 can be square, cylindrical, or other regular or irregular shapes, and this application does not limit it. For example, the housing 200 may include a top plate 210, a bottom plate 230, and a plurality of side plates 220 disposed around the outer edges of the top plate 210 and the bottom plate 230, and the working cavity 240 is formed between the top plate 210, the bottom plate 230, and the side plates 220.

[0077] Of the side panels 220, one is designated as an open panel 220a, which has an opening communicating with the working cavity 240. A door panel (not shown in the figure) for closing and opening the opening is also provided at the opening. The door panel can open or close the opening by sliding or by rotating; this application does not impose any limitations on this.

[0078] The door panel is designed to be opened during 3D printer downtime, allowing users to maintain and adjust the equipment within the working chamber 240 through the opening, or to remove the printed model from the working chamber 240 through the opening. The door panel is also designed to be closed during 3D printer operation, thereby reducing external environmental interference with the 3D printing process within the working chamber 240. Furthermore, the door panel can be opened during 3D printing to facilitate rapid heat dissipation from the working chamber 240.

[0079] The tool head 400 is used to heat, extrude, and accurately deposit printing material onto the heated bed 300 to build a three-dimensional model. In one embodiment of this application, the tool head 400 may include a nozzle 410 and a heating element, which heats the printing material to a molten state to ensure that the printing material can be smoothly extruded and uniformly deposited onto the heated bed 300. The extruder is used to precisely extrude the molten printing material through the nozzle 410 and deposit it layer by layer onto the heated bed 300 along a predetermined path to form a three-dimensional model.

[0080] The heated bed 300 has a bearing surface 310 facing the tool head 400. The bearing surface 310 is used to support and heat the material model extruded by the tool head 400, thereby enhancing the first layer adhesion of the material and providing a stable foundation for subsequent printing. At the same time, the heated bed can also slow down the cooling rate of the printed model, reduce the stress caused by the temperature gradient in the printed model, and reduce the risk of deformation of the printed model.

[0081] The tool head 400 and the heated bed 300 are movably disposed within the working chamber 240. For example, the heated bed 300 can be movably disposed within the working chamber 240 along the second direction Z, and the tool head 400 can be movably disposed within the working chamber 240 along the first direction Y and the third direction X, thereby realizing relative movement of the heated bed 300 and the tool head 400 in three directions. It is understood that in other possible embodiments of this application, the tool head 400 and the heated bed 300 may also move along other directions, and this application does not limit this.

[0082] In one embodiment of this application, the bearing surface 310 of the heated bed 300 extends along a first direction Y and a third direction X. For ease of explanation, one side of the bearing surface 310 of the heated bed 300 is designated as the upper part, and the side of the heated bed 300 away from the bearing surface 310 is designated as the lower part. The tool head 400 is disposed above the heated bed 300 and is movably disposed within the working cavity 240 along the first direction Y and the third direction X. By moving along the first direction Y and the third direction X, the tool head 400 can accurately deposit printing material in various areas of the heated bed 300 and complete the configuration of the printed model in the first direction Y and the third direction X.

[0083] The heated bed 300 is movably disposed in the working chamber 240 along the second direction Z. By moving along the second direction Z, the heated bed 300 can dynamically adjust the distance between itself and the tool head 400, thereby ensuring that the printing material can be deposited layer by layer on the bearing surface 310 of the heated bed 300 along the second direction Z according to the preset trajectory, and complete the configuration of the printing module in the second direction Z.

[0084] During the printing process, exhaust gas and high temperature will inevitably accumulate in the working chamber 240 of the 3D printing equipment 1000. In order to reduce the impact of exhaust gas and high temperature in the working chamber 240 on the 3D printing effect, the working chamber 240 of the 3D printing equipment 1000 is usually equipped with an air duct 600.

[0085] Please refer to Figure 3. The air duct 600 includes an air intake channel 610 and an exhaust channel 620. The airflow outside the 3D printing equipment 1000 can reach the working chamber 240 through the air intake channel 610, and exhaust gas and / or high-temperature gas in the working chamber 240 can be discharged outside the 3D printing equipment 1000 through the exhaust channel 620.

[0086] In related technologies, the air duct 600 structure of the 3D printing equipment 1000 is not reasonably designed, resulting in poor exhaust performance of the 3D printing equipment 1000.

[0087] To address the aforementioned issues, in one embodiment of this application, the air outlet 612 of the air inlet channel 610 is positioned above the heated bed 300. By positioning the air outlet 612 above the heated bed 300, the airflow from the air outlet 612 can directly contact the printed model above the heated bed 300. This reduces interference from the transmission mechanism or other electronic components below the heated bed 300 on the air intake of the air inlet channel 610, reduces airflow turbulence, optimizes the structure of the air duct 600 of the 3D printing equipment 1000, and improves the exhaust efficiency of the 3D printing equipment 1000.

[0088] The structure of the air duct 600 of the 3D printing equipment 1000 in this application will be described in detail below.

[0089] The air duct 600 includes an air intake channel 610. In one embodiment of this application, the air intake channel 610 includes an air outlet 612, and the airflow of the air intake channel 610 can enter the working chamber 240 through the air outlet 612.

[0090] The air outlet 612 is located above the heated bed 300. It should be noted that, in this application, the definition of the air outlet 612 being located above the heated bed 300 varies depending on the movement trajectory of the heated bed 300. When the heated bed 300 is fixedly installed within the working chamber 240, or can only move within the working chamber 240 along the first direction Y and the third direction X, all space on the side of the heated bed 300 facing the tool head 400 can be defined as above the heated bed 300. When the heated bed 300 moves along the second direction Z, only at the highest point of the heated bed 300's movement (i.e., the point closest to the tool head 400) can the space on the side of the heated bed 300 facing the tool head 400 be defined as above the heated bed 300.

[0091] This application places the air outlet 612 above the heated bed 300, so that the airflow blown out by the air outlet 612 can directly contact the printed model above the heated bed 300, thereby reducing the interference of the transmission mechanism or other electronic components below the heated bed 300 on the air intake channel 610, reducing airflow turbulence, optimizing the structure of the air duct 600 of the 3D printing equipment 1000, and improving the exhaust efficiency of the 3D printing equipment 1000.

[0092] Referring to Figures 3 to 5, the shape of the air outlet 612 can be rectangular, circular, or other regular or irregular shapes; this application does not impose any limitations on this. In one embodiment of this application, the air outlet 612 is configured as a long strip or an array of long strips. Compared to circular or other shapes, the long strip or array of long strips of air outlet 612 has a larger air outlet area and a more uniform airflow distribution per unit area, which can effectively improve the exhaust throughput of the air duct 600 and the coverage area of ​​the air duct 600 over the working chamber 240, thereby improving the exhaust effect of the air duct 600.

[0093] The long side direction of the air outlet 612 (i.e., the length direction of the air outlet 612) can extend along the first direction Y, the second direction Z, or the third direction X or other oblique directions; this application does not impose any restrictions on this. In one embodiment of this application, the top plate 210 of the housing 200 is disposed opposite to the bearing surface 310 of the heated bed 300, and the side plate 220 of the housing 200 is disposed perpendicular to the bearing surface 310 of the heated bed 300. The top plate 210 of the housing 200 and the open plate 220a of the housing 200 have an intersection line P. The length direction of the air outlet 612 is parallel to the extension direction of the intersection line P. In this way, it can be ensured that the extension direction of the air outlet 612 remains parallel to the direction of the heated bed bearing surface, thereby increasing the effective area of ​​the airflow blowing out of the air outlet 612 covering the heated bed, improving the exhaust effect of the air duct on the printed model on the heated bed, and improving the printing quality of the 3D printing equipment.

[0094] The air intake channel 610 also includes an air inlet 611, through which airflow from outside the 3D printing equipment 1000 can enter the air intake channel 610. The air inlet 611 can be located on one side of the top plate 210 of the 3D printing equipment 1000, on one side of the side plate 220 of the 3D printing equipment 1000, or on one side of the bottom plate 230 of the 3D printing equipment 1000. When the air inlet 611 is located on one side of the top plate 210, it can be directly mounted on the top plate 210 or on a structural surface of other structural components that are on the same plane as the top plate 210. When the air inlet 611 is located on one side of the side plate 220, it can be mounted on the side plate 220 or on a structural surface of other structural components that are on the same plane as the side plate 220; this application does not impose any limitations on this.

[0095] In one embodiment of this application, the air inlet 611 is located on one side of the top plate 210. To reduce the impact of the transmission structure below the heated bed on the air intake channel, the air outlet 612 of the air intake channel needs to be located above the heated bed, that is, the air outlet 612 needs to be located close to the top plate 210. By also locating the air inlet 611 close to the top plate 210 in this embodiment, the distance between the air inlet 611 and the air outlet 612 of the air intake channel can be effectively reduced, the airflow resistance in the air intake channel can be reduced, the smoothness of the airflow in the air duct can be improved, and the exhaust effect of the 3D printing equipment 1000 can be improved.

[0096] In another possible embodiment of this application, the air inlet 611 can also be located on one side of the open plate 220a. The air inlet 611 can assist the open opening of the open plate 220a in exhausting the working chamber 240, thereby improving the ventilation effect of the 3D printing equipment 1000 when the door is opened. The air inlet 611 being located on one side of the open plate 220a includes being located at the turning connection point where the open plate 220a connects to other side plates 220, or at the bottom of the open plate 220a. These locations are close to the air outlet 612, which can shorten the airflow path. At the same time, these locations make the whole machine more concise and aesthetically pleasing, reducing the number of protruding parts at the air outlet 612, thereby reducing the probability of collision damage during transportation or daily use.

[0097] In addition, in other possible embodiments of this application, the air inlet 611 may be partially disposed on one side of the top plate 210 and partially disposed on one side of the open plate 220a. In this way, while assisting the open port in exhausting the working chamber 240, the distance between the air inlet 611 and the air outlet is reduced, the airflow resistance in the air inlet channel is reduced, the airflow smoothness of the air duct is improved, and the exhaust effect of the 3D printing equipment 1000 is improved.

[0098] Referring to Figure 5, the air inlet 611 can be rectangular, circular, or other regular or irregular shapes. In one embodiment of this application, the air inlet 611 is a narrow rectangular opening; the length of the air inlet 611 is B1, and the width is B2, satisfying: 1 / 100 ≤ B2 / B1 ≤ 1 / 5. The length direction of the air inlet 611 is parallel to the plane of the heated bed 300. Compared to other openings, the narrow air inlet 611 reduces airflow turbulence at the air inlet 611, making the airflow more stable after entering the heated bed 300, improving the heat exchange effect between the airflow and the heated bed 300, and improving the exhaust effect of the air duct 600. The air inlet 611 is set parallel to the plane of the heated bed 300, which allows the airflow to enter the heated bed 300 more smoothly, reduces the airflow resistance caused by the change of direction, reduces the exhaust resistance of the air duct 600 of the 3D printing equipment 1000, and improves the exhaust effect of the air duct 600 of the 3D printing equipment 1000.

[0099] In another possible embodiment of this application, the air inlet 611 is disposed on one side of the base plate 230 and / or open plate 220a of the 3D printing equipment 1000, and is connected to the air outlet 612 through the air inlet channel 610. The air inlet channel 610 may be formed in the side plate 220 and / or the housing 200, wherein the air inlet 611 is lower than the air outlet 612 along the second direction Z. Due to the height difference along the second direction Z, the exhaust gas and / or high-temperature gas in the working chamber 240 will not flow back out of the air inlet 611 through the air outlet 612 because the temperature is higher than the ambient temperature. Only when the working chamber 240 is actively ventilated by the exhaust mechanism 100 can the external airflow flow from the air inlet 611 into the air outlet 612 through the air inlet channel 610. When arranged in this way, the air inlet channel 610 has a function close to a one-way channel.

[0100] Referring to Figure 6, the 3D printing equipment 1000 also includes an air intake damper mechanism 500, which is used to open or close the air intake channel 610 to control the inflow or outflow of gas within the air intake channel 610. In one embodiment of this application, the air intake damper mechanism 500 may include a damper frame 510, an air intake damper 520, and an air intake drive assembly 530.

[0101] The damper bracket 510 serves as the main structure of the intake damper mechanism 500, supporting and connecting the various component assemblies of the intake damper mechanism 500. The damper bracket 510 is connected to the housing 200, and the damper bracket 510 and the housing 200 can be connected by threads, by snap-fit, or by integral molding; this application does not impose any restrictions on this.

[0102] The air intake passage 610 may be formed entirely on the damper 510, or partially on the damper 510, or partially extend to the housing 200 connected to the damper 510, or may be completely disposed on the housing 200. This application does not limit this.

[0103] The intake damper 520 is movably mounted on the damper bracket 510 or the housing 200. Driven by the intake drive assembly 530, the intake damper 520 can open or close the intake port 611 or the outlet 612 to open or close the intake passage 610. The intake drive assembly 530 can be a motor, a cylinder, or other transmission structures; this application does not impose any limitations on this.

[0104] When the length direction of the air inlet 611 is parallel to the plane of the heated bed 300, after the air inlet damper 520 is opened, the airflow flows into the air inlet channel 610 in the air inlet direction Z1. The Z1 direction is determined by the opening angle of the air inlet damper 520, the shape of the air inlet 611, and the orientation of the air inlet 611. The Z2 direction is determined by the orientation of the air outlet 612. It is understood that when the air inlet channel 610 is only provided on the housing 200, the angle formed by Z1 and Z2 is C. C can be 30°, 60°, or 180°, and this application does not limit this. In one embodiment of this application, the angle between the direction of the airflow in the air inlet section and the direction of the airflow in the air outlet section is C, where 40°≤C≤90°. Under this angle limitation, it is possible to avoid the airflow generating vortices in the air inlet and outlet sections due to excessively small turning angles, resulting in energy waste, and it is also possible to avoid excessive leakage of exhaust gas or noise from the working chamber 240 due to an excessively large opening of the air inlet damper 520.

[0105] Please refer to Figure 7. The intake damper 520 controls the opening and closing of the intake passage 610 in several ways. The intake damper 520 can open or close the intake passage 610 by sliding or by rotating. In one embodiment of this application, the intake damper 520 is connected to the damper bracket 510 or the housing 200 via a pivot 540. The intake damper 520 includes a rotating side 522 near the pivot 540 and a closed side 523 away from the pivot 540, with the rotating side 522 and the closed side 523 arranged opposite to each other. The intake damper has a closed position and an open position. When the intake damper 520 rotates to the closed position, the closed side 523 contacts the inner wall surface of the air inlet 611 of the intake passage 610, thereby blocking the exchange of air between the intake passage 610 and the external air, and closing the intake passage 610. When the intake damper 520 rotates around the pivot 540 to the open position, the closed side 523 of the intake damper 520 separates from the inner wall of the intake port 611 of the intake passage 610, and the intake passage 610 is opened.

[0106] The rotating side 522 of the air intake damper 520 can be located near or away from the center of the heated bed 300. In one embodiment of this application, when the air intake damper 520 is rotated to the closed state, the closed side 523 is closer to the center of the heated bed 300 than the rotating side 522, that is, the rotating shaft 540 of the air intake damper 520 is positioned towards the outside of the housing 200. This allows the air intake damper 520 to shield the air intake channel 610, reducing noise leakage during equipment operation. When the air intake damper 520 is configured in this way, it will open towards the rear of the machine, thus reflecting the noise from the working chamber 240 to the rear. In typical placement scenarios, this effectively scatters noise and reduces the impact of equipment noise. Furthermore, when a laser tool is mounted on the tool head of the 3D printing equipment, the air intake damper 520 can effectively shield the laser from exposure, preventing the laser from directly shining into the eyes through the air intake channel 610.

[0107] The intake damper 520 can open towards the side of the intake passage 610 or towards the side away from the intake passage 610. In one embodiment of this application, when the intake damper 520 is in the open position, the closed side 523 is located outside the housing 200 and the intake passage 610 is opened. In this way, the encroachment of the intake damper 520 on the space of the intake passage 610 is reduced when it is open, the airflow of the intake passage 610 is increased, and the air intake effect of the intake passage 610 is improved.

[0108] When the intake damper 520 is in the closed position, the intake drive assembly 530 can drive the intake damper 520 to rotate 30° to open the intake damper 520. The intake drive assembly 530 can also drive the intake damper 520 to rotate 60° to open the intake damper 520, and the intake drive assembly 530 can also drive the intake damper 520 to rotate 180° to open the intake damper 520. This application does not limit this. In one embodiment of this application, during the rotation between the open and closed positions, the rotation angle of the intake damper 520 is A, where A satisfies: 20°≤A≤45°. Under this angle limitation, the intake damper 520 will not experience increased stress or jamming in the mechanical structure due to excessive rotation angle, and it can also ensure that the intake damper 520 has a sufficient opening angle.

[0109] Please refer to Figures 8 and 9 for the driving of the intake damper 520 to rotate. In one embodiment of this application, a groove 521 is provided between the rotating side 522 and the closed side 523. The intake drive assembly 530 may include a drive member 531 and a drive rod 532. The drive rod 532 includes a main rod portion 5321 and a sliding portion 5322; the main rod portion 5321 includes a first end and a second end disposed opposite to each other; the first end is connected to the drive member 531, and the sliding portion 5322 is disposed in the groove 521.

[0110] The driving component 531 can rotate the main rod portion 5321, causing the sliding portion 5322 to slide within the slide groove 521. When the sliding portion 5322 slides to the point where the slide groove 521 is close to the closed side 523, the slide groove 521 causes the closed side 523 of the intake damper 520 to contact the inner wall surface of the intake passage 610, and the intake damper 520 is rotated to the closed position, thus closing the intake passage 610. When the slide groove 521 slides to the point where it is close to the rotating side 522, the closed section of the intake damper 520 separates from the inner wall surface of the intake passage 610, and the intake damper 520 rotates to the open position, thus opening the intake passage 610. The driving component 531 can be a motor, a rotary cylinder, or other rotary transmission components; this application does not limit the specific components.

[0111] Please refer to Figure 9. To improve the stability of the sliding part 5322 sliding within the slide groove 521, in one embodiment of this application, the sliding part 5322 includes a first shaft segment 53221 and a second shaft segment 53222 connected to each other. The first shaft segment 53221 is slidably disposed within the slide groove 521, and the second shaft segment 53222 protrudes out of the slide groove 521 along the side of the first shaft segment 53221 away from the main rod portion 5321. The drive rod also includes a limiting part 5323, which is disposed on the second shaft segment 53222. The limiting part 5323 is used to cooperate with the main rod portion 5321 to engage the sliding part 5322 within the slide groove 521, thereby preventing the sliding part 5322 from disengaging from the slide groove 521 during sliding and improving the stability of the sliding part 5322 sliding within the slide groove 521.

[0112] Referring to Figures 10 and 11, the 3D printing equipment 1000 may further include an exhaust mechanism 100, which is located within the working chamber 240. The exhaust mechanism 100 generates airflow within the air duct 600 to either exhaust the gas from the working chamber 240 or circulate the gas within the working chamber 240. The exhaust channel 620 of the air duct 600 is located within the exhaust mechanism 100.

[0113] The exhaust mechanism 100 includes a support frame 1, which serves as the main structural component of the exhaust mechanism 100 and supports and connects the various component assemblies of the exhaust mechanism 100. The support frame 1 has a top facing the top plate 210, a bottom facing the bottom plate 230, and a side connecting the top and bottom. To reduce the impact of the exhaust mechanism 100 on the movement of the tool head 400, in one embodiment of this application, the distance between the top of the support frame 1 and the top plate 210 is greater than the distance between the tool head 400 and the top plate 210. This avoids interference of the exhaust mechanism 100 with the movement of the tool head 400 and increases the movable space of the tool head 400 in the first direction Y and the third direction X.

[0114] The support frame 1 includes an air inlet 1211, an air inlet chamber 13, an air outlet chamber 14, and an air outlet 1121. An exhaust channel 620 is located within the air outlet chamber 14. The exhaust mechanism includes an exhaust airflow path 600a. Along the exhaust airflow path 600a, the airflow within the working chamber of the 3D printing equipment 1000 can enter the exhaust mechanism 100 through the air inlet 1211, and then be discharged outside the 3D printing equipment via the air inlet chamber 13, the air outlet chamber 14, and the air outlet 1121. Through the exhaust airflow path, the 3D printing equipment 1000 can quickly expel the high temperatures and exhaust gases generated during the 3D printing process, thereby maintaining the temperature of the working chamber at a low temperature, providing conditions for low-temperature printing.

[0115] The air inlet 1211 of the exhaust mechanism 100 can be located near the top or bottom of the support frame 1, and this application does not impose any limitation on this. In one embodiment of this application, the air inlet 1211 is located near the top surface of the support frame 1, thereby reducing the distance between the air inlet 1211 and the air outlet 612 and improving the exhaust efficiency of the exhaust mechanism 100 for the gas in the working chamber 240.

[0116] There are various ways to arrange the air inlet 1211 of the exhaust mechanism 100. In one embodiment of this application, the support frame 1 of the exhaust mechanism 100 has a first side and a second side arranged opposite to each other along a first direction Y. The first side is closer to the air outlet 612 than the second side. The air inlet 1211 is located on the first side of the exhaust mechanism 100 facing the air outlet 612. Compared with locating the air inlet 1211 on the second side or the bottom, the air inlet 1211 located on the first side can effectively shorten the distance for the airflow to enter the exhaust mechanism 100, thereby allowing the airflow to enter the exhaust mechanism 100 more smoothly and improving the exhaust efficiency of the exhaust mechanism 100.

[0117] In other possible embodiments of this application, the air inlet 1211 may also be partially disposed on the first side and partially extend to the top of the exhaust mechanism. The cross-section of the air inlet 1211 is designed in an inverted "L" shape, so that the entire air inlet 1211 of the exhaust mechanism is completely oriented towards the air outlet 612, thereby allowing the airflow from the air outlet 612 to pass through the exhaust port 1121 in a near-straight line and enter the exhaust mechanism 100, increasing the coverage area of ​​the air outlet 612 over the air inlet 1211, reducing the airflow between the air inlet 1211 and the air outlet 612, and improving the exhaust efficiency of the exhaust mechanism 100 for the gas in the working chamber 240.

[0118] To reduce the airflow interference between the outlet 612 and the inlet 1211 caused by the heated bed 300, in one embodiment of this application, the line connecting the shape center of the inlet 1211 and the shape center of the outlet 612 is a first straight line L1. The first straight line L1 is at least partially located above the heated bed 300. This reduces the interference of the transmission mechanism of the heated bed 300 or other electronic components below the heated bed 300 on the airflow path of the exhaust mechanism 100, reduces gas turbulence in the working chamber 240 air duct 600, and improves exhaust efficiency.

[0119] It should be noted that when the air inlet 1211 is only located on the first side, the shape center of the air inlet 1211 is the center point of the cross-sectional shape of the air inlet 1211 on the first side. When the cross-section of the air inlet 1211 on the first side is rectangular, the shape center of the air inlet 1211 is the intersection of the diagonals of the rectangle. When the cross-section of the air inlet 1211 on the first side is circular, the shape center of the air inlet 1211 is the center of the circle. When the air inlet 1211 is partially located on the first side and partially located on the top, the shape center of the air inlet 1211 is the midpoint of the line connecting the center point of the cross-section of the air inlet 1211 on the first side and the center point of the cross-section of the air inlet 1211 on the top. For example, when the air inlet 1211 is an inverted "L" shape with rectangular cross-sections on the first side and top, the center of the shape of the air inlet 1211 is the intersection of the diagonals of the rectangular cross-section on the first side and the midpoint of the intersection of the diagonals of the rectangular cross-section on the top.

[0120] To further improve the exhaust effect of the exhaust mechanism 100, the displacement plane of the nozzle 410 is the reference plane H, which is parallel to the bearing surface 310 of the heated bed 300. A line perpendicular to the heated bed 300 and passing through its shape center is the reference line L'. The reference line intersects the reference plane at a reference point. The line connecting the shape center of the air outlet 612 and the reference point is the second straight line L2. The angle between the first straight line L1 and the second straight line L2 is D, satisfying: 0°≤D≤20°. Under this angle constraint, the airflow entering the air inlet 1211 from the air outlet 612 can pass precisely through the printing center of the working chamber 240, closer to the center of the heating area of ​​the printing operation. This ensures that the airflow can better remove the printing heat and exhaust gas from the working chamber 240, improving the exhaust effect of the exhaust mechanism 100 on the working chamber 240.

[0121] In one embodiment of this application, the air inlet 1211 includes a direct air inlet 12111 and a filter air inlet 12112, the air inlet cavity 13 includes a direct air inlet cavity 131 and a filter air inlet cavity 132, the direct air inlet 12111 is connected to the direct air inlet cavity 131; the filter air inlet 12112 is connected to the filter air inlet cavity 132; the exhaust mechanism 100 also includes a filter element 4, which is disposed in the filter air inlet cavity 132.

[0122] Please refer to Figures 12 and 13. The exhaust airflow path 600a includes a direct exhaust airflow path 610a and a filtered exhaust airflow path 620a. Referring to Figure 12, in the direct exhaust airflow path 610a, the airflow enters the exhaust chamber 14 only through the direct exhaust inlet 12111 and the direct exhaust inlet cavity 131, then reaches the exhaust port 1121 through the exhaust channel 620 of the inlet cavity 13, and is discharged outside the 3D printing equipment 1000 through the exhaust port 1121. Referring to Figure 13, in the filtered exhaust airflow path 620a, the airflow enters the filtered inlet cavity 132 only through the filtered inlet 12112, is filtered by the filter element 4 of the filtered inlet cavity 132, enters the exhaust chamber 14 through the filtered inlet cavity 132, then reaches the exhaust port 1121 through the exhaust channel 620 of the inlet cavity 13, and is discharged outside the 3D printing equipment 1000 through the exhaust port 1121. The filtered exhaust airflow path 620a can filter the gas inside the working chamber 240, thereby reducing the pollution of the working chamber 240 to the outside and providing a certain degree of cooling performance for the working chamber 240. The direct exhaust airflow path 610a can quickly exhaust the gas inside the working chamber 240 to the outside, thereby achieving rapid cooling of the working chamber 240.

[0123] Understandably, in other possible embodiments of this application, the air inlet chamber 13 may not be divided into a direct exhaust air inlet chamber 131 and a filter air inlet chamber 132. Instead, the filter element 4 may be directly placed within a single exhaust chamber 14, with the filter element 4 positioned corresponding to the filter air inlet 12112. In this way, when gas enters the exhaust chamber 14 from the filter air inlet 12112, the gas can also flow through the filter element 4 and be filtered by it. Compared to this embodiment, dividing the air inlet chamber 13 into independent direct exhaust air inlet chamber 131 and filter air inlet chamber 132 ensures that the gas entering from the filter air inlet 12112 can be fully filtered by the filter element 4, improving the exhaust efficiency of the filter exhaust airflow path 620a.

[0124] In addition to the direct exhaust airflow path 610a and the filtered exhaust airflow path 620a, in one embodiment of this application, the exhaust airflow path 600a also includes a semi-filtered exhaust airflow path. In the semi-filtered exhaust airflow path, part of the airflow enters the exhaust chamber 14 through the direct exhaust inlet 12111 and the direct exhaust inlet cavity 131; part of the airflow enters the exhaust chamber 14 through the filtered inlet 12112 and the filtered inlet cavity 132. In this way, the filtration effect of the exhaust mechanism 100 on the exhaust gas can be taken into account, and the airflow in the working chamber 240 can be discharged to the outside more quickly, thereby achieving rapid cooling of the working chamber 240.

[0125] The direct exhaust air inlet 12111 can be located near the top surface or the bottom surface of the support frame 1, and the filter air inlet 12112 can be located near the top surface or the bottom surface of the support frame 1. This application does not impose any restrictions on this. In one embodiment of this application, the direct exhaust air inlet 12111 is closer to the tool head 400 than the filter air inlet 12112, and the line connecting the shape center of the direct exhaust air inlet 12111 and the shape center of the air outlet 612 is at least partially located above the heated bed 300. This reduces the distance between the direct exhaust air inlet 12111 and the air outlet 612, making the airflow between the air outlet 612 and the air inlet 1211 smoother and improving the exhaust efficiency of the direct exhaust airflow path 610a.

[0126] Referring to Figures 12 to 14, to separate the internal space of the exhaust mechanism 100, forming a direct exhaust air inlet chamber 131, a filter air inlet chamber 132, and an exhaust chamber 14, in one embodiment of this application, the support frame 1 includes a support plate 11 and an air inlet baffle 12. The support plate 11 surrounds and forms the exhaust chamber 14. The air inlet baffle 12 and the support plate 11 form an air inlet chamber 13 on the side opposite to the exhaust chamber. The direct exhaust air inlet 12111 and the filter air inlet 12112 are disposed on the air inlet baffle 12. The filter element 4 has a first filter surface 41 disposed opposite to the filter air inlet 12112, a second filter surface 42 disposed opposite to the exhaust chamber 14, and a plurality of side surfaces 43 connecting the first filter surface 41 and the second filter surface 42; airflow enters the filter element 4 from the first filter surface and exits the filter element 4 from the second filter surface. A sealing element 44 is provided on at least one side surface 43 of the filter element 4. The material of the sealing element 44 can be rubber, foam, or other materials, and this application does not limit this. When the filter element 4 is placed into the air inlet chamber 13, the sealing element 44 on the filter element 4 makes sealing contact with the cavity wall of the exhaust chamber 14, thereby separating the air inlet chamber 13 to form a direct exhaust air inlet chamber 131 and a filter air inlet chamber 132.

[0127] Please refer to Figure 15. Besides the use of seal 44, in other possible embodiments of this application, the support frame 1 includes a support plate 11 and an air inlet baffle 12. The air inlet baffle 12 includes a connected air inlet plate 121 and a baffle 122. The air inlet plate 121 and the support plate 11 enclose an air inlet cavity 13. A direct exhaust air inlet 12111 and a filtered air inlet 12112 are disposed on the air inlet plate 121. The baffle 122 is disposed within the air inlet cavity 13. The baffle 122 can be integrally formed with the air inlet plate 121, or it can be separately formed from the air inlet plate 121 and then interconnected. The baffle 122 can also be integrally formed with the support plate 11, or it can be separately formed from the support plate 11 and then interconnected; this application does not limit this. The partition 122 separates the air inlet chamber 13 to form a direct air inlet chamber 131 and a filter air inlet chamber 132.

[0128] In one embodiment of this application, the support plate 11 includes a partition plate 111 and a fixing plate 112; the partition plate 111 is connected to the air intake partition plate 12 and forms an air intake cavity 13 with the air intake partition plate 12; the partition plate 111 and the fixing plate 112 form an exhaust cavity 14, and the exhaust port 1121 is provided on the fixing plate 112; the partition plate 111 is provided with a direct exhaust port 1112 and a filtered exhaust port 1113, the direct exhaust port 1112 is connected to the direct exhaust air intake cavity 131 and the exhaust cavity 14; the filtered exhaust port 1113 is connected to the filtered air intake cavity 132 and the exhaust cavity 14.

[0129] In the direct-flow circulating airflow path 610b, the airflow passes through the working chamber 240 of the 3D printing equipment 1000, the direct-flow air inlet 12111, the direct-flow air inlet cavity 131, the direct-flow air outlet 1112, the exhaust cavity 14, and the return air outlet 1114, and flows back into the working chamber 240 of the 3D printing equipment 1000. In the filtered circulating airflow path 620b, the airflow passes through the working chamber 240 of the 3D printing equipment 1000, the filtered air inlet 12112, the filtered air inlet cavity 132, the filtered air outlet 1113, the exhaust cavity 14, and the return air outlet 1114, and flows back into the working chamber 240 of the 3D printing equipment 1000. The air inlet plate 121, partition plate 122, separator plate 111, and fixing plate 112 divide the direct exhaust air inlet chamber 131, filter air inlet chamber 132, and exhaust chamber 14 of the exhaust mechanism 100 into different independent chambers, thereby reducing the interference of airflow between different chambers and improving the stability of airflow in each airflow path.

[0130] Please refer to Figure 16. In order to improve the utilization rate of filter element 4, in one embodiment of this application, the projection of filter element 4 in its thickness direction covers the projection of filter outlet 1113. Filter element 4 has a first filter part disposed relative to filter outlet 1113 and a second filter part disposed offset from filter outlet 1113. Along the thickness direction of filter element 4, there is a gap E between filter element 4 and partition plate 111.

[0131] Under normal airflow path, the airflow will reach the filter inlet 12112 through the filter inlet 12 of the air inlet baffle 12, and then flow out of the filter inlet 132 through the first filter section and the filter outlet 1113. The gap E is set so that in addition to the airflow reaching the filter outlet 1113 through the first filter section, part of the airflow can reach the gap E between the filter element 4 and the baffle 111 through the second filter section, and then reach the filter outlet 1113 through the gap E, and finally leave the filter inlet 132 through the filter outlet 1113. In this way, the filter element 4 outside the area of ​​the filter outlet 1113 is still utilized, thereby increasing the usable area of ​​the filter element 4.

[0132] In one embodiment of this application, the gap between the filter element 4 and the support plate 11 is E, where 5mm ≤ E ≤ 12mm. Under this size constraint, it is possible to avoid the increased exhaust resistance caused by the gap between the filter element 4 and the support plate 11 being too small, and also to avoid the space utilization rate of the filter inlet chamber 132 for the exhaust mechanism 100 being too large.

[0133] The filter outlet 1113 can be positioned relative to the upper part or the lower part of the filter element 4, and this application does not impose any limitation on this. In one embodiment of this application, the vertical line from the center of the filter element 4 passes through the filter outlet 1113, and the filter outlet 1113 is positioned relative to the middle of the filter element 4. This allows the airflow passing through the filter element 4 to flow evenly to the filter outlet 1113, improving the filtration effect of the filter element 4 on the airflow. On the other hand, the filter outlet 1113 positioned in the middle of the filter element 4 can reduce eddies and dead zones in the airflow inside the filter element 4, avoiding the formation of unfiltered areas, thereby effectively improving filtration efficiency, ensuring that a higher proportion of impurities are removed, and improving the filtration effect of the filter element 4.

[0134] Please refer to Figure 17. The support frame 1 is also provided with a return air vent 1114. The exhaust mechanism 100 also includes a circulating airflow path 600b. Under the circulating airflow path 600b, the airflow only passes through the working chamber 240, the air inlet 1211, and the air inlet cavity 13 of the 3D printing equipment 1000 to enter the exhaust cavity 14, then reaches the return air vent 1114 through the exhaust channel 620 of the air inlet cavity 13, and finally flows back to the working chamber 240 of the 3D printing equipment 1000 through the return air vent 1114. The circulating airflow path 600b is used to drive the airflow to circulate within the working chamber 240, thereby maintaining a stable temperature within the working chamber and creating conditions for temperature-controlled (constant temperature) printing in the 3D printing equipment.

[0135] In one embodiment of this application, the exhaust mechanism 100 further includes a heating element 10, which is disposed on the circulating airflow path 600b. By heating the circulating airflow path 600b, the heating element 10 can heat the entire working chamber, thereby providing conditions for high-temperature printing of the 3D printing equipment.

[0136] Referring to Figures 18 and 19, the circulating airflow path 600b may also include a direct-flow circulating airflow path 610b and a filtered circulating airflow path 620b. In the direct-flow circulating airflow path 610b, the airflow only passes through the direct-flow air inlet 12111, the direct-flow air inlet chamber 131, the direct-flow air outlet 1112, enters the exhaust chamber 14, and then reaches the return air outlet 1114 through the exhaust channel 620 of the exhaust chamber 14. Finally, it flows back to the working chamber 240 of the 3D printing equipment 1000 through the return air outlet 1114. Under the filter circulating airflow path 620b, the airflow enters the filter inlet chamber 132 only through the filter inlet 12112, and after being filtered by the filter element 4 of the filter inlet chamber 132, it enters the exhaust chamber 14 through the filter outlet 1113, and then reaches the return air outlet 1114 through the exhaust channel 620 of the inlet chamber 13, and finally flows back to the working chamber 240 of the 3D printing equipment 1000 through the return air outlet 1114.

[0137] In conjunction with the heating element 10, the filtered circulating airflow path 620b can achieve both heating and filtration of the airflow in the working chamber 240. The direct-flow circulating airflow path 610b enables rapid airflow within the working chamber 240, thereby achieving rapid heating of the working chamber 240.

[0138] Considering that the materials printed inside the exhaust mechanism 100 during internal airflow circulation are often highly polluting, filtration is often more important than heating. Therefore, in one embodiment of this application, the distance between the shape center of the filter outlet 1113 and the shape center of the return air outlet 1114 along the direction perpendicular to the axis of the circulating fan 3 (first direction Y in the figure) is less than the distance between the shape center of the filter outlet 1113 and the shape center of the direct exhaust outlet 1112. This embodiment shortens the distance between the filter outlet 1113 and the return air outlet 1114 by placing the filter outlet 1113 close to the return air outlet 1114, thereby improving the exhaust efficiency of the filtration circulation airflow path 620b and enhancing the filtration effect of the exhaust mechanism 100 on the working chamber 240.

[0139] In addition to the filtered circulating airflow path 620b and the direct-exhaust circulating airflow path 610b, in one embodiment of this application, the circulating airflow path also includes a semi-filtered circulating airflow path. In the semi-filtered circulating airflow path, part of the airflow enters the exhaust chamber 14 through the direct-exhaust air inlet 12111 and the direct-exhaust air inlet cavity 131; part of the airflow enters the exhaust chamber 14 through the filtered air inlet 12112 and the filtered air inlet cavity 132. In this way, both rapid heating of the working chamber 240 and filtration of the airflow in the working chamber 240 can be achieved.

[0140] The exhaust system 100 also includes a direct exhaust fan 2 and a circulating fan 3, which are disposed within the exhaust chamber 14. The direct exhaust fan 2 drives the airflow along the exhaust airflow path 600a. The direct exhaust fan 2 can be a turbine fan, a centrifugal fan, or an axial fan; this application does not limit the type of fan. In one embodiment of this application, the direct exhaust fan 2 is an axial fan. Compared to other fans, axial fans have a larger exhaust volume for the same size or power, which can effectively improve the exhaust efficiency of the direct exhaust airflow path 610a.

[0141] The direct exhaust fan 2 can be arranged opposite to the direct exhaust inlet 12111, the filter inlet 12112, or the exhaust outlet 1121. This application does not limit this arrangement. In one embodiment of this application, the direct exhaust inlet 12111, the direct exhaust inlet chamber 131, the direct exhaust fan 2, and the exhaust outlet 1121 are arranged sequentially along the axial direction of the direct exhaust fan 2. Along the axial direction of the direct exhaust fan 2, the projections of the direct exhaust fan 2 and the direct exhaust inlet 12111 at least partially overlap. This shortens the distance between the direct exhaust inlet 12111, the direct exhaust fan 2, and the exhaust outlet 1121, thereby improving the exhaust efficiency of the direct exhaust airflow path 610a.

[0142] The circulating fan 3 is used to drive airflow along the circulating airflow path 600b. The circulating fan 3 can be a turbine fan, a centrifugal fan, or an axial fan; this application does not limit the type. In one embodiment of this application, the circulating fan 3 is an axial fan. Compared with other fans, axial fans have a larger exhaust volume for the same size or power, which can effectively improve the exhaust efficiency of the circulating airflow path 600b.

[0143] In one embodiment of this application, the circulating fan 3 and the return air inlet 1114 are arranged along the axial direction of the circulating fan 3 (the first direction shown in the figure), so as to shorten the distance between the circulating fan 3 and the return air inlet 1114, reduce the exhaust resistance of the circulating fan 3, and improve the circulation efficiency of the circulating airflow path 600b.

[0144] In one embodiment of this application, the heating element is disposed between the circulating fan 3 and the return air port 1114, so as to ensure that the airflow passing through the circulating fan 3 can fully exchange heat with the heating element 10 before flowing back to the working chamber 240 of the 3D printing equipment, thereby improving the heating effect of the heating element 10 on the circulating airflow path 600b.

[0145] In one embodiment of this application, the exhaust mechanism 100 and the heated bed 300 partially overlap in the first direction Y, and the circulating fan 3 and the air inlet chamber 13 partially overlap in the second direction Z. The circulating fan 3, the air inlet chamber 13, and the filter element 4 disposed in the air inlet chamber 13 share the space of the exhaust chamber 14 in the second direction Z. In this way, the thickness of the exhaust mechanism 100 in the first direction Y is reduced, and the space occupied by the exhaust mechanism 100 in the first direction Y of the working chamber 240 is reduced. As a result, the heated bed 300 arranged along the first direction Y with the exhaust mechanism 100 can occupy more space in the working chamber 240, increase the arrangeable area of ​​the heated bed 300, improve the thermal utilization efficiency of the heated bed 300, and improve the printing effect of the 3D printing equipment 1000.

[0146] When the heating element is placed close to the circulating fan 3, in order to reduce the impact of the heating element 10 on the circulating fan 3, in another possible embodiment of this application, the circulating fan 3 includes a motor and a fan blade, and the fan blade motor is connected to the fan blade drive; the motor is located on the side of the fan blade away from the heating element 10, so as to reduce the impact of the heating element 10 on the fan blade motor, reduce the heating rate of the fan blade motor, and improve the stability of the fan blade motor operation.

[0147] The direct exhaust fan 2 and the circulating fan 3 can be arranged at any position in the exhaust cavity. In one embodiment of this application, the exhaust channel 620 has an air inlet side and an air outlet side arranged opposite to each other along the first direction Y. The circulating fan 3, the heating element 10, the return air port 1114, and the air inlet cavity 13 are located on the air inlet side, while the direct exhaust fan 2 and the exhaust port 1121 are located on the exhaust side. The axial directions of the direct exhaust fan 2 and the circulating fan 3 are parallel to the first direction Y. Thus, when the exhaust mechanism 100 requires electrical maintenance, the maintenance personnel only need to remove the partition plate 111 on the air inlet side to complete the maintenance of the circulating fan 3 and the heating element 10 on the air inlet side of the exhaust channel 620. Similarly, the maintenance personnel only need to remove the fixing plate 112 on the exhaust side to complete the maintenance of the direct exhaust fan 2. In this way, the interference of the exhaust channel 620 on the electrical maintenance of the exhaust mechanism 100 is reduced, the difficulty of electrical maintenance of the exhaust mechanism 100 for maintenance personnel is reduced, and the maintenance efficiency of the exhaust mechanism 100 is improved.

[0148] It is understood that in other possible embodiments of this application, electrical components such as heating element 10, circulating fan 3, and direct exhaust fan 2 may also be arranged on the same side of exhaust channel 620, and this application does not limit this.

[0149] The exhaust mechanism also includes an electrical chamber 9, which houses electrical components for providing power to the exhaust mechanism 100. In one embodiment of this application, the electrical chamber 9 is located on the exhaust side of the exhaust channel 620. The exhaust mechanism 100 and the heated bed 300 partially overlap in the first direction Y. The electrical chamber 9 and the direct exhaust fan 2 partially overlap in the direction perpendicular to the axis of the direct exhaust fan 2 (the second direction Z in the figure). The electrical chamber 9 and the direct exhaust fan 2 share the space of the exhaust chamber 14 in the second direction Z. This reduces the thickness of the exhaust mechanism 100 in the first direction Y and reduces the space occupied by the exhaust mechanism 100 in the first direction Y of the working chamber 240. Consequently, the heated bed 300, which is arranged along the first direction Y with the exhaust mechanism 100, can occupy more space in the working chamber 240, increasing the area that the heated bed 300 can be arranged in, improving the thermal utilization efficiency of the heated bed 300, and improving the printing effect of the 3D printing equipment 1000.

[0150] In one embodiment of this application, the distance between the electrical compartment 9 and the exhaust chamber 14 is less than the length of the circulating fan 3, thereby reducing the relative width between the exhaust channel 620 and the exhaust shaft of the circulating fan 3 and improving the return air capacity of the circulating fan 3.

[0151] In another possible embodiment of this application, the distance between the circulating fan 3 and the electrical compartment 9 in the axial direction (Y direction in the figure) of the circulating fan 3 is less than the length of the circulating fan 3 in the perpendicular direction (Z direction in the figure) of the axis of the circulating fan 3. In this way, the exhaust diameter of the circulating fan 3 is greater than the length of the exhaust channel 620 on the side of the circulating fan 3, thereby improving the circulation capacity of the circulating fan 3 for the airflow in the exhaust channel 620.

[0152] Referring to Figure 19, the exhaust mechanism 100 also includes an inner damper 6, which is used to switch between the exhaust airflow path 600a and the recirculation airflow path 600b. Specifically, the inner damper 6 is disposed within the exhaust channel 620 and divides the exhaust channel 620 into a first cavity section 621 and a second cavity section 622. The direct exhaust fan 2 and the exhaust port 1121 are adjacent to the first cavity section 621, and the recirculation fan 3 and the return air port 1114 are adjacent to the second cavity section 622.

[0153] When the inner damper 6 is opened, the first cavity section 621 and the second cavity section 622 are connected, and the circulating airflow path 600b is opened. Driven by the circulating fan 3, the airflow in the 3D printing equipment 1000 can reach the return air port 1114 through the working cavity 240, the air inlet cavity 13, the first cavity section 621 and the second cavity section 622, and then flow back into the working cavity 240 through the return air port 1114.

[0154] When the inner damper 6 is closed, the first chamber 621 and the second chamber 622 are separated, and the circulating airflow path 600b is blocked. The airflow inside the 3D printing equipment 1000 can then be driven by the direct exhaust fan 2, passing through the working chamber 240, the air inlet chamber 13, and the first chamber 621 to reach the exhaust port 1121, and then discharged outside the 3D printing equipment 1000 through the exhaust port 1121.

[0155] The exhaust mechanism 100 can control the opening and closing of the circulating airflow path 600b and the exhaust airflow path 600a according to the different temperature requirements of the printing material, thereby controlling the circulating heating or exhaust cooling of the 3D printing equipment 1000, so that the 3D printing equipment 1000 can be compatible with the printing needs of more materials and improve the versatility of the 3D printing equipment 1000.

[0156] The inner damper 6 can be located on the side of the exhaust channel 620 near the direct exhaust fan 2, or on the side of the exhaust channel 620 near the circulating fan 3. This application does not limit this. In one embodiment of this application, the electrical compartment 9 and the direct exhaust fan 2 overlap in the projection portion in the second direction Z, and the circulating fan 3 and the exhaust cavity 14 overlap in the projection portion in the second direction Z. The electrical compartment 9 and the exhaust cavity 14 overlap in the first direction Y. Compared to other locations, the cross-sectional area of ​​the exhaust channel 620 at the overlap of the electrical compartment 9 and the exhaust cavity 14 is the smallest. By placing the inner damper 6 at the overlap of the electrical compartment 9 and the exhaust cavity 14, the size of the inner damper 6 can be effectively reduced, the arrangement cost of the inner damper 6 can be reduced, and the opening and closing efficiency of the inner damper 6 can be improved.

[0157] In one embodiment of this application, the exhaust mechanism 100 further includes an external air damper 7, which is disposed at the exhaust port 1121. The exhaust mechanism 100 can control the opening and closing of the exhaust port 1121 by opening and closing the external air damper 7.

[0158] When the exhaust mechanism 100 is in cooling exhaust mode, the exhaust mechanism 100 can control the outer air door 7 to open, the inner air door 6 to close, and turn on the direct exhaust fan 2, thereby driving the airflow in the 3D printing equipment 1000 to flow along the exhaust airflow path 600a.

[0159] When the exhaust mechanism 100 is in the circulating heating mode, the exhaust mechanism 100 can control the inner air damper 6 to open and the outer air damper 7 to close, and turn on the circulating fan 3, thereby driving the airflow in the 3D printing equipment 1000 to flow along the circulating airflow path 600b. At the same time, due to the presence of the outer air damper 7, when the airflow passes through the first cavity section 621, the airflow will be guided by the first cavity section 621 and will all flow into the second cavity section 622, without leaking outward from the exhaust port 1121 adjacent to the first cavity section 621, thereby improving the flow efficiency of the airflow in the circulating airflow path 600b and improving the heating effect of the circulating airflow path 600b on the working chamber 240.

[0160] The external air damper 7 can be provided in one or more ways, and this application does not limit this. In one embodiment of this application, the exhaust mechanism 100 includes multiple external air dampers 7, which are arranged along the second direction Z at the exhaust port 1121. Each external air damper 7 has a hinged end and a movable end that are arranged opposite to each other. The hinged end is rotatably connected to the support frame 1. When the external air damper 7 is closed, each external air damper 7 hangs down along the first direction Y and together blocks the exhaust port 1121. When the free end of each external air damper 7 rotates and flips, the exhaust port 1121 is opened. Compared with providing a single external air damper 7, setting the external air damper 7 as a louver can effectively reduce the size of a single external air damper 7, reduce the space occupied by the damper when it is open, shorten the flipping time of the external air damper 7 due to the smaller damper mass, and improve the response speed of the external air damper 7.

[0161] The external air damper 7 can be flipped to the side of the exhaust cavity 14 or to the side away from the exhaust cavity 14. This application does not limit this. In one embodiment of this application, when the external air damper 7 is opened, the free end of each external air damper 7 flips to the side away from the exhaust cavity. In this way, the space occupied by the external air damper 7 in the exhaust cavity 14 is reduced, and the ventilation volume of the exhaust cavity 14 is increased.

[0162] The external damper 7 can be opened and closed by a motor, a rotary cylinder, or by the airflow from the direct exhaust fan 2, and can be closed by gravity or an elastic element. This application does not limit the scope of the application.

[0163] The inner damper 6 can be opened and closed by a motor, a rotary cylinder, or by the negative pressure generated by the airflow from the circulating fan 3. It can be closed by a resilient reset element on the rotating shaft 540. This application does not limit this.

[0164] In one embodiment of this application, the inner damper 6 and the outer damper 7 are rotatably connected to the support frame 1. When the inner damper 6 rotates in a first rotation direction and blocks the circulating airflow path 600b, the outer damper 7 rotates in a second rotation direction and opens the exhaust airflow path 600a. When the inner damper 6 rotates in the second rotation direction and opens the circulating airflow path 600b, the outer damper 7 rotates in the first rotation direction and blocks the exhaust airflow path 600a. The exhaust mechanism 100 also includes an inner and outer damper drive assembly 8, which is disposed in the exhaust chamber. The inner damper 6 and the outer damper 7 are located on opposite sides of the inner and outer damper drive assembly 8. The inner and outer damper drive assembly 8 can drive the inner damper 6 and the outer damper 7 to rotate in the first and second rotation directions, thereby driving the airflow in the exhaust mechanism 100 to switch between the circulating airflow path 600b and the exhaust airflow path 600a. Compared to driving the inner damper 6 and the outer damper 7 separately with multiple driving components, by placing the inner and outer damper driving assembly 8 between the inner damper 6 and the outer damper 7 and driving the inner damper 6 and the outer damper 7 simultaneously with one inner and outer damper driving assembly 8, the driving structure of the inner damper 6 and the outer damper 7 is optimized, the number of driving parts of the inner damper 6 and the outer damper 7 is reduced, the space occupied by the driving structure of the inner damper 6 and the outer damper 7 in the exhaust chamber is reduced, the area that can be arranged in the exhaust channel 620 is increased, and the exhaust effect of the exhaust mechanism 100 is improved.

[0165] To achieve simultaneous driving of the inner damper 6 and the outer damper 7, in one embodiment of this application, the outer damper 7 has a first rotating end and a first movable end arranged opposite to each other; the first rotating end is connected to the support frame 1, and is arranged closer to the linkage member 81 than the first movable end; the inner damper 6 has a second rotating end and a second movable end arranged opposite to each other; the second rotating end is connected to the support frame 1, and is arranged closer to the linkage member 81 than the second movable end.

[0166] Referring to Figure 20, the inner and outer damper drive assembly 8 includes a linkage 81, an outer damper connecting rod 82, an inner damper connecting rod 83, and a damper drive component 84. The linkage 81 is located between the inner damper 6 and the outer damper 7. One end of the outer damper connecting rod 82 is rotatably connected to the linkage 81, and the other end is connected to a first rotating end. One end of the inner damper connecting rod 83 is rotatably connected to the linkage 81, and the other end is connected to a second rotating end. In one possible embodiment of this application, the damper drive component 84 is used to drive the linkage 81 to move, so as to drive the inner damper 6 to rotate from a closed position to an open position, and simultaneously drive the outer damper 7 to rotate from an open position to a closed position. In another possible embodiment of this application, the damper drive component 84 is used to drive the linkage 81 to move, so as to drive the inner damper 6 and the outer damper 7 to rotate along a first rotation direction or a second rotation direction, wherein the first rotation direction and the second rotation direction are two opposite directions.

[0167] In practical applications, the damper drive component 84 can drive the linkage 81 to move, thereby driving the outer damper linkage 82 and the inner damper linkage 83 to move. This, in turn, causes the outer damper 7 to rotate via the outer damper linkage 82 and the inner damper to rotate via the inner damper linkage 83. Since the outer damper linkage 82 and the inner damper linkage 83 are located on opposite sides of the linkage 81 and are respectively connected to the rotating ends of the inner damper 6 and the outer damper 7 near the linkage 81, the damper can rotate even when the direction of movement of the linkage 81 remains unchanged. When the inner damper linkage 83, driven by the linkage 81, drives the inner damper 6 to rotate in the first rotation direction, the outer damper linkage 82, driven by the linkage 81, drives the outer damper 7 to rotate in the second rotation direction. Alternatively, when the inner damper linkage 83, driven by the linkage 81, drives the inner damper 6 to rotate in the second rotation direction, the outer damper linkage 82, driven by the linkage 81, drives the outer damper 7 to rotate in the first rotation direction. The first and second rotation directions are opposite directions. In one embodiment of this application, when the inner damper 6 is opened by the inner damper linkage 83, the outer damper 7 is closed by the outer damper linkage 82; when the inner damper 6 is closed by the inner damper linkage 83, the outer damper 7 is opened by the outer damper linkage 82. This achieves the switching between the circulating airflow path 600b and the exhaust airflow path 600a.

[0168] In one embodiment of this application, the end of the linkage 81 facing the inner damper 6 is recessed to the side away from the inner damper 6 to form a mounting groove 61. The inner damper connecting rod 83 is disposed in the mounting groove 61. The setting of the mounting groove 61 can increase the operable space at the installation location of the inner damper 6 and the inner damper connecting rod 83, thereby reducing the installation difficulty of the linkage 81 and the inner damper connecting rod 83 and improving the installation efficiency of the linkage 81 and the inner damper connecting rod 83.

[0169] The damper drive component 84 can rotate by driving the linkage component 81 to drive the inner damper 6 and the outer damper 7 to rotate, or it can slide by driving the linkage component 81 to drive the inner damper 6 and the outer damper 7 to rotate. This application does not limit this. In one embodiment of this application, the linkage component 81 is slidably disposed in the exhaust cavity 14 and can reciprocate along the second direction Z in the exhaust cavity 14 under the drive of the damper drive component 84. Compared with the rotational arrangement, the sliding arrangement occupies less space in the exhaust cavity 14 and has a higher space utilization rate. The movement of the linkage component 81 along the second direction Z can also reduce the length of the exhaust cavity 14 in the first direction Y, reduce the length of the exhaust mechanism 100 in the first direction Y, thereby reducing the space occupied by the exhaust mechanism 100 in the working cavity 240 in the first direction Y, thereby increasing the arrangeable area of ​​the heated bed 300 and improving the printing effect of the 3D printing equipment 1000.

[0170] In another possible embodiment of this application, the linkage 81 is a plate-like structure, with a length of J in the first direction Y and a length of K in the second direction Z, where J / K < 1; the inner damper link 83 and the outer damper link 82 are disposed on opposite sides of the linkage 81 along the first direction Y. This further reduces the space occupied by the linkage 81 in the first direction Y, improving the space utilization rate of the linkage 81 for the exhaust cavity 14.

[0171] Please refer to Figures 21 and 22. To drive the linkage 81, the damper drive component 84 can be a motor, a cylinder, or other drive structures. This application does not limit this. In one embodiment of this application, the damper drive component 84 includes a linkage rack 841, a damper drive component 842, and inner and outer damper drive gears 843. The linkage rack 841 is connected to the linkage component 81. The linkage rack 841 and the linkage component 81 can be integrally formed or separately formed and then connected to each other. This application does not limit this. In one embodiment of this application, the linkage rack 841 and the linkage component 81 are integrally formed, thereby reducing the manufacturing cost of the damper drive component 84 and improving the assembly efficiency of the damper drive component 84 and the linkage component 81.

[0172] The inner and outer damper drive gears 843 and the linkage rack 841 mesh with each other, and the damper drive component 842 is drivenly connected to the inner and outer damper drive gears 843. The damper drive component 842 can drive the inner and outer damper drive gears 843 to rotate, drive the linkage rack 841 to move, and thus drive the linkage component 81 to move. The damper drive component 842 can be a motor, a cylinder, or other rotary drive component, and this application does not limit it in this regard.

[0173] To improve the installation and maintenance efficiency of the damper drive component 84, in one embodiment of this application, the linkage rack 841 meshes with the inner and outer damper drive gears 843 in a plane perpendicular to the axial direction of the direct exhaust fan 2; the damper drive component 842 is at least partially installed in the exhaust cavity 14 along the axial direction of the direct exhaust fan 2, and the support frame 1 is designed to be open on the side of the mounting part of the damper drive component 842 away from the tool head 400 of the 3D printing equipment 1000, that is, from the mounting part of the damper drive component 842 to the fixing plate 112 side of the support frame 1, no other parts are installed. In this way, the user only needs to remove the fixing plate 112 of the support frame 1 or the side plate of the 3D printing equipment to realize the installation and maintenance of the damper drive component 842 and the drive gear, thereby improving the maintenance efficiency of the exhaust mechanism 100.

[0174] To facilitate the ventilation mechanism 100's control over the opening and closing of the inner and outer dampers 7, in one embodiment of this application, the ventilation mechanism 100 may further include a position detection component, which includes a sensor and a magnet. The magnet is located in the linkage 81; the sensor is located inside the exhaust chamber, or the positions of the magnet and the sensor may be interchanged. The sensor can obtain the position of the linkage 81 by sensing the position of the magnet and transmit it to the controller of the ventilation mechanism 100. The controller of the ventilation mechanism 100 will obtain the rotation angle of the inner damper 6 and the outer damper 7 based on the position of the linkage 81, thereby achieving precise control over the opening and closing of the inner damper 6 and the outer damper 7. It can also detect the position of the dampers, thereby enabling timely identification of faults.

[0175] Please refer to Figure 23. The exhaust mechanism 100 also includes a filter-direct switching damper assembly 5, which is used to realize the switching of airflow between the direct exhaust airflow path 610a and the filter exhaust airflow path 620a or between the direct exhaust circulating airflow path 610b and the filter circulating airflow path 620b.

[0176] For ease of explanation, the direct exhaust airflow path 610a and the direct recirculation airflow path 610b are referred to as the direct exhaust airflow path, and the filtered exhaust airflow path 620a and the filtered recirculation airflow path 620b are referred to as the filtered airflow path.

[0177] Please refer to Figure 24. The filter-to-direction switching damper assembly 5 may include a filter-to-direction switching damper 51 and a filter-to-direction driving component 52. The filter-to-direction switching damper 51 is movably disposed in the exhaust chamber 14. The filter-to-direction switching damper 51 can block the direct exhaust flow path or the filtered airflow path, thereby causing the airflow to travel along another path.

[0178] Specifically, the filter-to-direct flow switching damper 51 has a filtering position and a direct flow position. When the filter-to-direct flow switching damper 51 moves to the filtering position, it moves until it is in the exhaust flow path and blocks the airflow in the direct exhaust flow path, so that the airflow in the exhaust mechanism 100 can only flow along the filtered airflow path. When the filter-to-direct flow switching damper 51 moves to the direct flow position, it is located in the filtered airflow path and blocks the filtered airflow path, so that the airflow in the exhaust mechanism 100 can only flow along the direct exhaust flow path.

[0179] There are various ways to block the direct exhaust flow path and the filtered airflow path of the filter-direct switching damper 51. In one embodiment of this application, the filter-direct switching damper 51 is movably disposed in the working chamber 240. The filter-direct switching damper 51 can be movably disposed in the working chamber 240 by sliding or by rotating. This application does not limit this.

[0180] For example, the filter-to-direction switching damper 51 is rotatably disposed in the working chamber 240. When the filter-to-direction switching damper 51 is rotated to the filtration position, the filter-to-direction switching damper 51 rotates to block the direct exhaust air inlet 12111, so that when the direct exhaust fan 2 or the circulating fan 3 is turned on, the airflow in the working chamber 240 can only enter the exhaust chamber 14 through the filter air inlet 12112 and the filter air inlet chamber 132, thereby achieving the blocking of the direct exhaust airflow path.

[0181] When the filter-direct switching damper 51 is rotated to the direct-flow position, the filter-direct switching damper 51 rotates to block the filter inlet 12112, so that when the direct exhaust fan 2 or the circulating fan 3 is turned on, the airflow in the working chamber 240 can only enter the exhaust chamber 14 through the direct exhaust inlet 12111 and the direct exhaust inlet chamber 131, thereby achieving the blocking of the filter airflow path.

[0182] In another possible embodiment of this application, the filter-to-direct-flow switching damper assembly 5 is movably disposed within the exhaust chamber 14, and the filter-to-direct-flow switching damper 51 is slidably disposed within the exhaust chamber 14 or within the working chamber 240; this application does not impose any limitations on this. Exemplarily, the filter-to-direct-flow switching damper 51 is slidably disposed on the side of the partition plate 111 facing away from the intake partition plate 12. When the filter-to-direct-flow switching damper 51 slides to the filtering position, it slides to block the direct exhaust outlet 1112, thereby ensuring that when the direct exhaust fan 2 or the circulating fan 3 is turned on, the airflow in the working chamber 240 can only enter the exhaust chamber 14 through the filter inlet chamber 132 and the filter outlet 1113, thus achieving the blocking of the direct exhaust flow path. When the filter-to-direction switching damper 51 slides to the direct-flow position, it blocks the filter outlet 1113. This ensures that when the direct exhaust fan 2 or the circulating fan 3 is turned on, the airflow in the working chamber 240 can only enter the exhaust chamber 14 through the direct exhaust inlet 131 and the direct exhaust outlet 1112, thus blocking the filtered airflow path. Compared to a rotating configuration, the sliding configuration of the filter-to-direction switching damper 51 occupies less space in the exhaust chamber, effectively reducing the volume of the exhaust chamber and the exhaust mechanism 100, and improving the space utilization of the exhaust mechanism 100 within the working chamber 240.

[0183] Please refer to Figures 24 to 28. In one embodiment of this application, to enable the sliding of the filter-to-direction switching damper 51, the partition plate 111 includes a main surface 1115, a connecting surface 1116, and a baffle surface 1117. The main surface 1115 and the baffle surface 1117 are arranged opposite to each other, and the connecting surface 1116 connects the main surface 1115 and the baffle surface 1117. The filter outlet 1113 and the direct outlet 1112 are provided on the main surface 1115. The main surface 1115, the connecting surface 1116, and the baffle surface 1117 form a groove 1120, and the filter-to-direction switching damper 51 is slidably disposed in the groove 1120. The main surface 1115 is provided with a first through groove 1118, and the baffle surface 1117 is provided with a second through groove 1119. The first through groove 1118 and the second through groove 1119 are staggered in a direction perpendicular to the main surface 1115. The partition plate 111 is a plastic part, usually formed by injection molding. The first through groove 1118 and the second through groove 1119 form staggered slots in the direction perpendicular to the main body surface 1115. These staggered slots can simplify the mold structure and help reduce the demolding difficulty of the partition plate 111.

[0184] To reduce the difficulty of demolding the partition plate 111, the first through groove 1118 can be set at the direct exhaust port 1112 of the main body surface 1115 or at the filter exhaust port 1113 of the main body surface 1115. This application does not limit this. Considering that the filter inlet cavity 132 has high requirements for cavity sealing, setting the first through groove 1118 at the filter exhaust port 1113 may affect the sealing effect of the filter inlet cavity 132, thereby affecting the filtration effect of the filter element 4 on the airflow. Therefore, in one embodiment of this application, the first through groove 1118 is set at the direct exhaust port 1112. In this way, the manufacturing difficulty of the partition plate 111 can be reduced without affecting the filtration effect of the filter inlet cavity 132, and the stability of the exhaust mechanism 100 operation can be improved.

[0185] When the filter-to-direct airflow switching damper 51 is slidably disposed within the working chamber 240, in order to improve the switching efficiency of the filter-to-direct airflow switching damper assembly 5 for direct exhaust and filtered airflow, in one embodiment of this application, the direct exhaust outlet 612 is disposed at the upper part of the exhaust mechanism 100, and the filtered exhaust outlet 612 is disposed adjacent to the direct exhaust outlet 612. In this way, the distance between the filtered exhaust outlet 1121 and the direct exhaust outlet 1121 is shortened, the movement time of the filter-to-direct airflow switching damper 51 between the filtered exhaust outlet 1121 and the direct exhaust outlet 1121 is reduced, and the switching efficiency of the filter-to-direct airflow switching damper assembly 5 for the direct exhaust airflow path 610a and the filtered exhaust airflow path 620a, or for the direct exhaust circulating airflow path 610b and the filtered circulating airflow path 620b is improved.

[0186] To ensure that the adjacent arrangement of the filter outlet 612 and the direct outlet 612 does not affect the sliding of the filter-to-direction switching damper 51, in one embodiment of this application, the filter outlet 1113, the direct outlet 1112, and the filter-to-direction switching damper 51 satisfy the following relationship: F ​​= G = H and / or H < I, where F is the length of the filter outlet 1113 in the sliding direction of the filter-to-direction switching damper 51, G is the length of the direct outlet 1112 in the sliding direction of the filter-to-direction switching damper 51, H is the length of the filter-to-direction switching damper 51 in the sliding direction, and I is the distance between the shape center of the filter outlet 1113 and the shape center of the direct outlet 1112. Under the constraints of F=G=H, it is possible to minimize the size of the filter-to-direction switching damper 51 and reduce its movement distance between the filter outlet 1113 and the direct outlet 1112 while ensuring that the filter-to-direction switching damper 51 covers both the filter outlet 1113 and the direct outlet 1112. When H < I, it is ensured that the filter-to-direction switching damper 51 will not interfere with the filter outlet 612 and the direct outlet 612 during sliding, thereby improving the smoothness of airflow switching.

[0187] The filter-to-direct-flow drive component 52 is used to drive the filter-to-direct-flow switching damper 51 to move between the filtration position and the direct-flow position, thereby controlling the switching of the exhaust mechanism 100 between the filtration mode and the direct-flow mode. The filter-to-direct-flow drive component 52 can be a motor, a cylinder, or other structures, and this application does not limit it. In one embodiment of this application, the filter-to-direct-flow drive component 52 includes a filter-to-direct-flow rack 5201, a filter-to-direct-flow drive member 5202, and a filter-to-direct-flow damper drive gear 5203. The filter-to-direct-flow rack 5201 is disposed on the filter-to-direct-flow switching damper 51, and the filter-to-direct-flow damper drive gear 5203 is drivenly connected to the filter-to-direct-flow drive member 5202 and meshes with the filter-to-direct-flow rack 5201. The driving force of the filter-to-direct-flow drive member 5202 can be transmitted to the moving filter-to-direct-flow rack 5201 by driving the filter-to-direct-flow damper drive gear 5203, thereby driving the filter-to-direct-flow switching damper 51 to slide within the working chamber 240.

[0188] The filter rack 5201 and the filter switching damper 51 can be separately installed and then connected to each other, or they can be integrally formed; this application does not impose any limitation on this. In one possible embodiment of this application, the filter rack 5201 and the filter switching damper 51 are integrally formed. This reduces the processing cost of the filter rack 5201 and the filter switching damper 51, improves the assembly efficiency of the filter rack 5201 and the filter switching damper 51, and reduces the manufacturing cost of the exhaust mechanism 100.

[0189] The filter straight toothed rack 5201 can be located at the upper part or the lower part of the filter straight switching damper 51. This application does not limit this. In one embodiment of this application, the filter straight toothed rack 5201 is located in the middle region of the filter straight switching damper 51, that is, the distance from the center point of the filter straight toothed rack 5201 to the upper and lower edges of the filter straight switching damper 51 is approximately equal. This ensures that the driving force transmitted from the filter straight driving component 52 to the filter straight toothed rack 5201 can be evenly transmitted to all parts of the filter straight switching damper 51, improving the uniformity of the force on the filter straight switching damper 51, avoiding stress concentration on the filter straight switching damper 51, and extending the service life of the filter straight switching damper 51.

[0190] In one embodiment of this application, the length direction of the filter rack 5201 is consistent with the sliding direction of the filter switching damper 51. Thus, the filter rack 5201 and the filter damper drive gear 5203 can be installed and maintained simply by removing the fixing plate 112, reducing the maintenance difficulty of the exhaust mechanism 100.

[0191] Furthermore, in one embodiment of this application, the direct exhaust inlet 12111, the direct exhaust fan 2, and the exhaust outlet 1121 are arranged along the axial direction of the direct exhaust fan 2; the filter straight rack 5201 and the filter straight damper drive gear 5203 mesh in a plane perpendicular to the axial direction of the direct exhaust fan 2; the filter straight drive component 52 is at least partially installed in the exhaust cavity 14 along the axial direction of the direct exhaust fan 2 and drives the filter straight switching damper 51 to move; the support frame 1 is designed to be open on the side of the filter straight drive component mounting part away from the tool head 400 of the 3D printing equipment 1000, that is, from the mounting part of the filter straight drive component to the side of the support frame 1 fixing plate 112, no other parts are installed. In this way, the user only needs to remove the fixing plate 112 of the support frame 1 or the side plate of the 3D printing equipment to realize the installation and maintenance of the filter straight drive component, thereby improving the maintenance efficiency of the exhaust mechanism 100.

[0192] In the description of the embodiments of this application, it should be noted that the orientation or positional relationship of the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and other indicators are based on the orientation or positional relationship of the drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0193] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art will understand that all or part of the processes for implementing the above embodiments and equivalent variations made in accordance with the claims of this application are still within the scope of this application.

Claims

1. A 3D printing device, characterized in that, It includes a housing, a heated bed, a tool head, and an air intake damper mechanism. The housing forms a working cavity, and the heated bed and / or the tool head are movably disposed within the working cavity. The air intake damper mechanism is disposed on the housing, the air intake damper mechanism forms an air intake channel, and / or the air intake damper mechanism and the housing form an air intake channel, the air intake channel being connected to the working chamber; The air intake channel has an air outlet, through which the airflow can enter the working chamber. The air outlet is located above the heated bed. The air intake damper mechanism is used to open and close the air intake channel to control the flow of gas into the working chamber.

2. The 3D printing equipment as described in claim 1, characterized in that, The heated bed has a bearing surface for supporting the printed model; The housing includes a top plate and a plurality of side plates disposed around the outer edge of the top plate; the top plate is disposed opposite to the bearing surface; The top plate and each of the side plates form a closed cavity for the working chamber. One of the side plates is set as an open plate, which is provided with an opening for the printing model to enter and exit and a door plate to close the opening. The air intake channel also has an air inlet, through which airflow from outside the 3D printing equipment can enter the air intake channel. The air inlet is located on one side of the top plate and / or one side of the open plate.

3. The 3D printing equipment as described in claim 2, characterized in that, The top plate and the open plate have intersecting lines, and the air outlet is configured as a long strip or a long strip array; The length direction of the air outlet is parallel to the intersecting line.

4. The 3D printing equipment as described in claim 1, characterized in that, The air intake damper mechanism includes: A damper frame, which is connected to the housing, and the air intake passage portion is disposed on the damper frame; An air intake damper is movably mounted on the damper frame or the housing. An intake drive assembly is used to drive the intake damper to open or close the intake passage.

5. The 3D printing equipment as described in claim 4, characterized in that, The air intake damper is connected to the damper frame or the housing via a rotating shaft. The air intake damper includes a rotating side and a closed side that are arranged opposite to each other. The rotating side is located close to the rotating shaft. When the air intake damper is closed, the closed side is closer to the center of the heated bed than the rotating side.

6. The 3D printing equipment as described in claim 5, characterized in that, The air intake damper has a closed position and an open position. When the air intake damper is in the closed position, it blocks the air intake passage. When the air intake damper is in the open position, the closed side is located outside the housing and the air intake passage is opened. During the rotation between the open and closed positions, the rotation angle of the air intake damper is A, where A satisfies: 20°≤A≤45°.

7. The 3D printing equipment as described in claim 4, characterized in that, The air intake damper is connected to the damper frame or the housing via a rotating shaft. The air intake damper includes a rotating side and a closed side that are arranged opposite to each other. The rotating side is located close to the rotating shaft, and a sliding groove is provided between the rotating side and the closed side. The intake drive assembly includes a drive member and a drive rod. The drive member has a rotating part. One end of the drive rod is drivenly connected to the rotating part, and the other end of the drive rod is slidably disposed in the groove.

8. The 3D printing equipment as described in claim 7, characterized in that, The drive rod includes a main rod portion, a sliding portion, and a limiting portion; the main rod portion includes a first end and a second end disposed opposite to each other; the first end is connected to the drive component. The sliding part is connected to the second end. The sliding part is slidably disposed in the slide groove. When the sliding part slides to the slide groove near the rotating side, the air intake damper is in the open position. When the sliding part slides to the slide groove near the closed side, the air intake damper is in the closed position. The sliding part includes a first shaft segment and a second shaft segment connected to each other. The first shaft segment is slidably disposed in the slide groove, and the second shaft segment protrudes out of the slide groove along the side of the first shaft segment away from the main rod. The limiting part is disposed on the second shaft segment and is used to cooperate with the main rod to engage the sliding part in the slide groove.

9. The 3D printing equipment according to any one of claims 1-6, characterized in that, The air intake channel also has an air inlet, through which airflow from outside the 3D printing equipment can enter the air intake channel. The air inlet is rectangular. The length of the air inlet is B1 and the width is B2, satisfying: 1 / 100≤B2 / B1≤1 / 5. The length direction of the air inlet is parallel to the heated bed plane.

10. The 3D printing equipment according to any one of claims 1-6, characterized in that, The air intake channel includes an air intake section and an air outlet section that are connected to each other. The angle between the direction of the airflow in the air intake section and the direction of the airflow in the air outlet section is C, where 40°≤C≤90°.

11. The 3D printing equipment according to any one of claims 1-6, characterized in that, The 3D printing equipment also includes an exhaust mechanism located inside the working chamber. The exhaust mechanism is used to exhaust the gas inside the working chamber or to circulate the gas inside the working chamber. The exhaust mechanism is provided with an air inlet, through which the gas in the working chamber flows into the exhaust mechanism. The air inlet is positioned facing the air outlet, or the air inlet is located on the side of the exhaust mechanism facing the air outlet.

12. The 3D printing equipment as described in claim 11, characterized in that, The line connecting the shape center of the air inlet and the shape center of the air outlet forms a first straight line, which is at least partially located above the heated bed. The heated bed has a bearing surface for supporting the printed model, and the heated bed can move in a direction perpendicular to the bearing surface.

13. The 3D printing equipment as described in claim 12, characterized in that, The tool head has a nozzle for ejecting deposited molten material, the displacement plane of the nozzle being a reference plane, which is parallel to the bearing surface of the heated bed; A line perpendicular to the heated bed and passing through the center of the heated bed's shape is a reference line; the reference line intersects the reference plane at a reference point; The line connecting the shape center of the air outlet and the reference point is the second straight line, and the angle between the first straight line and the second straight line is D, satisfying: 0°≤D≤20°.

14. The 3D printing equipment as described in claim 13, characterized in that, The exhaust mechanism includes a support frame and a filter element; the air inlet is located on the support frame. The support frame also forms an air inlet chamber and an air outlet chamber that are connected to the air inlet. The gas in the working chamber enters the air outlet chamber through the air inlet and the air inlet chamber, and is discharged outside the working chamber or flows back into the working chamber through the air outlet chamber. The air inlet includes a direct air inlet and a filter air inlet; the filter element is disposed in the air inlet cavity and is arranged corresponding to the filter air inlet; The direct exhaust air inlet is closer to the tool head than the filter air inlet, and the line connecting the shape center of the direct exhaust air inlet and the shape center of the air outlet is at least partially located above the heated bed.

15. The 3D printing equipment as described in claim 11, characterized in that, The housing includes a top plate, which is disposed opposite to the bearing surface; The exhaust mechanism has a top surface near the top plate and a bottom surface away from the top plate, and the air inlet is located near the top surface; and / or, the distance between the top of the exhaust mechanism and the top plate is greater than the distance between the tool head and the top plate, and the air inlet is located near the top plate of the exhaust mechanism.

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