Independent flow field device for avoiding lens and powder spreading surface pollution and 3D printer
By designing an independent flow field device, the black smoke is blown and sucked out of the 3D metal printing process using blowing and suction components, the problem of black smoke pollution during laser melting is solved, and the manufacturing efficiency and equipment maintenance life are improved.
Patent Information
- Application Number
- CN202411890852.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-02-14
AI Technical Summary
During 3D metal printing, the black smoke generated by laser melting will contaminate the powdered surface and lenses, resulting in reduced manufacturing efficiency and increased equipment maintenance.
Design an independent flow field device, including a blowing part and a suction part, and uses components such as blowing pipe, a pressure equalizer, a blowing head, a suction pipe, a suction chamber and a suction head to introduce gas into the blowing pipe, Use the blowing head to blow the black smoke to the inhalation head and suck out the black smoke through the inhalation tube and inhalation compartment to reduce contamination on the powdered surface and lenses.
It effectively reduces the pollution of black smoke on the powdered surface and lenses, and improves the manufacturing efficiency of 3D metal printing and the maintenance life of equipment.
Smart Images
Figure CN119426629A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of metal 3D printing, and in particular to an independent flow field device and a 3D printer for avoiding contamination of lenses and powder-laying surfaces. Background Art
[0002] A 3D metal printer is a scientific instrument used in the fields of physics, basic engineering and technological sciences, and mechanical engineering. It uses laser melting technology to melt metal powder to form functional solid parts. It can be used to print high-throughput metal materials. It is a fully digital rapid prototyping manufacturing process that directly produces high-density metal parts based on the interface data of the three-dimensional CAD layer. The thickness of the molten metal layer ranges from 20 microns to 100 microns, and metal is rapidly formed.
[0003] When a 3D printer manufactures parts, it needs to first perform powder laying, that is, laying metal powder in the molding cylinder of the molding chamber, and then the laser melting device is set on the molding chamber and aimed at the metal powder in the molding cylinder for laser melting, and then the metal is solidified and formed. However, in the process of laser melting the metal powder, black smoke, that is, black smoke, will be generated at the contact point between the laser and the surface of the laid metal powder, which will pollute the powder laying surface, and the black smoke will gradually spread in the molding chamber. The black smoke particles will be adsorbed on the lens of the laser melting device, causing pollution to the lens of the laser melting device. Summary of the invention
[0004] In order to improve the problem of black smoke generated during laser melting causing contamination to the powder-laying surface and the lens, the present application provides an independent flow field device and a 3D printer for avoiding contamination of the lens and the powder-laying surface.
[0005] The present application provides an independent flow field device and a 3D printer for avoiding contamination of lenses and powdering surfaces, which adopt the following technical solutions: In a first aspect, the present application provides an independent flow field device for preventing contamination of lenses and powdering surfaces: An independent flow field device for preventing contamination of a lens and a powder spreading surface, comprising an air blowing part and an air suction part, wherein the air blowing part and the air suction part are arranged on two sides of a molding chamber opposite to each other; The blowing part includes a blowing pipe, a pressure equalizing chamber and a blowing head, one end of the pressure equalizing chamber is connected to the blowing pipe, and the other end of the pressure equalizing chamber is connected to the blowing head; the pressure equalizing chamber and the blowing head are both fixedly installed on the side wall of the molding chamber, the pressure equalizing chamber is located on the outside of the molding chamber, and the blowing head is located on the inside of the molding chamber, and the connection between the pressure equalizing chamber and the blowing head passes through the side wall of the molding chamber; the blowing head is arranged toward the powder spreading surface and the lens; The air suction part includes an air suction pipe, an air suction cabin and an air suction head, one end of the air suction cabin is connected to the air suction pipe, and the other end of the air suction cabin is connected to the air suction head; the air suction cabin and the air suction head are both fixedly installed on the side wall of the molding chamber, and the air suction cabin is located outside the molding chamber, and the air suction head is located inside the molding chamber, and the connection between the air suction cabin and the air suction head passes through the side wall of the molding chamber.
[0006] By adopting the above technical solution, when laser melting is carried out in the molding chamber, gas is introduced into the blowing pipe, and the gas is blown out from the suction head after passing through the suction cabin. Since the blowing head is arranged toward the powder-laying surface and the lens, the black smoke just generated on the powder-laying surface and the black smoke escaping to the lens are blown to the side where the suction head is located. The suction pipe can inhale air through an external fan, thereby sucking out the black smoke from the suction head, the suction cabin and the suction pipe in turn, thereby reducing the pollution of the powder-laying surface and the lens caused by the black smoke.
[0007] Optionally, the pressure equalizing cabin includes a first cabin body and a second cabin body, the air blowing head includes a first head body and a second head body, the first cabin body and the first head body are connected to each other, the second cabin body and the second head body are connected to each other, the first head body is arranged toward the lens, and the second head body is arranged toward the powder spreading surface; The air blowing pipe is connected to the first cabin body and the second cabin body respectively through the first branch pipe and the second branch pipe.
[0008] By adopting the above technical solution, blowing air to the powdered surface and the lens respectively can help improve the accuracy and efficiency of blowing away the black smoke.
[0009] Optionally, the pressure equalizing chamber is gradually expanded from the air blowing pipe toward the air blowing head, and the air blowing head includes an air intake rectangular frame and a speed increasing plate fixedly connected to the air intake rectangular frame, and a plurality of speed increasing holes are provided on the speed increasing plate. The opening at one end of the air intake rectangular frame is connected to the pressure equalizing chamber, and the opening at the other end of the air intake rectangular frame is connected to the speed increasing holes.
[0010] By adopting the above technical solution, the gas in the blowing pipe enters the equalizing chamber and the air intake rectangular frame in turn, and then blows out through the speed-increasing hole. The equalizing chamber is gradually expanded from the blowing pipe toward the blowing head, which can make the gas in the blowing pipe gradually diffuse in the equalizing chamber and increase the gas blowing area; through the setting of the speed-increasing hole, the blowing gas can be accelerated to facilitate the blowing away of black smoke.
[0011] Optionally, a plurality of pressure equalizing orifice plates are arranged in the pressure equalizing chamber at intervals along the gradually expanding direction of the pressure equalizing chamber.
[0012] By adopting the above technical solution, multiple pressure equalizing orifice plates can diffuse the gas passing through the pressure equalizing chamber step by step, improve the diffusion effect, and then improve the pressure equalizing effect, so that the gas in the pressure equalizing chamber can enter the air intake rectangular frame over a large area, avoiding the gas in the pressure equalizing chamber from concentrating in the middle to enter the air intake rectangular frame, thereby avoiding the concentrated blowing of gas, resulting in a situation where only local black smoke can be blown away.
[0013] Optionally, a plurality of mounting protrusions are fixedly connected to both sides of the pressure equalizing orifice plate in the width direction, and mounting grooves for correspondingly inserting the mounting protrusions are provided on the top wall and the bottom wall of the pressure equalizing cabin.
[0014] By adopting the above technical solution, the installation of the pressure equalizing orifice plate is facilitated.
[0015] Optionally, the thickness of the pressure equalizing chamber is gradually reduced from the blowing pipe toward the blowing head.
[0016] The adoption of the above technical solution helps to pressurize and accelerate the gas in the equalizing chamber.
[0017] Optionally, the speed increasing hole is arranged in a triangular shape.
[0018] By adopting the above technical solution, if the speed-increasing holes of the same area and number are round, the wind speed will be very fast and the black smoke cannot be blown away well; if square holes are used, although they have better effects than round holes, the processing cost of square holes is high. The speed-increasing holes of the present application are arranged in a triangular shape, which is convenient for reasonably controlling the blowing wind speed and saving processing costs.
[0019] Optionally, the length of the first head body is smaller than that of the second head body, and the size of the speed increasing hole on the first head body is larger than the size of the speed increasing hole on the second head body; the distance between the lowest point of the speed increasing hole on the first head body and the bottom surface of the speed increasing plate on the first head body is the first distance, and the distance between the lowest point of the speed increasing hole on the second head body and the bottom surface of the speed increasing plate on the second head body is the second distance, and the second distance is larger than the first distance.
[0020] By adopting the above technical solution, the length of the first head body is smaller than that of the second head body. This is because the wind blown out by the second head body needs to cover the entire printing arc surface at the powder-laying surface, so the length is longer. The first head body is mainly used for cleaning, so it does not need to be longer.
[0021] The size of the speed-increasing hole on the first head body is larger than that of the speed-increasing hole on the second head body. This is because the wind blown out by the second head body acts on the lens, and the wind blown out by the second head body acts on the powder-laying surface. The powder-laying surface is where black smoke emerges, and there is more black smoke. Therefore, the size of the speed-increasing hole there is smaller than that at the lens, that is, the wind speed acting on the powder-laying surface is greater than the wind speed at the lens.
[0022] In addition, the printed arc surface, that is, the powder-laying surface where the laser acts, is a metal powder. The black smoke generated by laser melting will be cached for about ten millimeters. It will be cached. The second distance is greater than the first distance, which can make the blowing point have a suitable distance from the powder-laying surface, quickly blow away the black smoke cached on the powder-laying surface, and at the same time avoid blowing away the unformed powder. The small amount of black smoke that cannot be blown away will escape to the lens. The speed-increasing hole is at a suitable distance from the lens, which is compatible with the blowing position, and the first head will blow away the black smoke at the lens.
[0023] Optionally, the air intake head includes an air outlet rectangular frame and a partition plate, wherein the partition plate is obliquely arranged in the air outlet rectangular frame and divides the air outlet rectangular frame into an upper chamber and a lower chamber, wherein the upper chamber and the lower chamber are both connected to the air outlet cabin; the lowest side of the partition plate is farther away from the air outlet cabin than the highest side, and there are gaps between the top and bottom surfaces of the partition plate and the inner wall of the air outlet rectangular frame.
[0024] By adopting the above technical solution, if no partition plate is provided, when the black smoke is sucked out through the air outlet rectangular frame, a lot of black smoke will accumulate around the air outlet rectangular frame, and even when the speed of the black smoke blowing in is fast, the black smoke will be blown directly onto the air outlet rectangular frame. By providing the partition plate, the black smoke can be sucked out from the upper chamber and the lower chamber, most of the black smoke is sucked out directly from the upper chamber, and a small part of the black smoke is sucked out from the lower chamber, and at the same time, a suction wind speed difference is generated between the upper chamber and the lower chamber, which helps to fully suck out the blowing black smoke.
[0025] In a second aspect, the present application provides a 3D printer, which adopts the following technical solution: A 3D printer comprises the above-mentioned independent flow field device for avoiding contamination of lenses and powder spreading surfaces.
[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. When laser melting is performed in the molding chamber, gas is introduced into the blowing pipe, and the gas is blown out from the suction head after passing through the suction chamber. Since the blowing head is arranged toward the powder-laying surface and the lens, the black smoke just generated on the powder-laying surface and the black smoke escaping to the lens are blown to the side where the suction head is located. The suction pipe can inhale air through an external fan, so that the black smoke is sucked out from the suction head, the suction chamber and the suction pipe in turn, reducing the pollution caused by the black smoke to the powder-laying surface and the lens; 2. The gas in the blowing pipe enters the equalizing chamber and the air inlet rectangular frame in turn, and then blows out through the speed-increasing hole; the equalizing chamber is gradually expanded from the blowing pipe toward the blowing head, so that the gas in the blowing pipe can be gradually diffused in the equalizing chamber, increasing the gas blowing area; through the setting of the speed-increasing hole, the blowing gas can be accelerated, so as to blow away the black smoke; 3. The air suction head includes an air outlet rectangular frame and a partition plate. The partition plate is obliquely arranged in the air outlet rectangular frame and divides the air outlet rectangular frame into an upper chamber and a lower chamber. The black smoke can be sucked away from the upper chamber and the lower chamber. Most of the black smoke is sucked away directly from the upper chamber, and a small amount of black smoke is sucked away from the lower chamber. At the same time, a suction wind speed difference is generated between the upper chamber and the lower chamber, which helps to fully suck away the black smoke blowing over. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of an independent flow field device for avoiding contamination of lenses and powder-spreading surfaces according to an embodiment of the present application.
[0028] Figure 2 This is a schematic diagram of the overall structure of the independent flow field device used to avoid contamination of the lens and powder surface from another angle.
[0029] Figure 3 It is a schematic diagram for showing the structure of the first head body and the second head body.
[0030] Figure 4 It is a schematic diagram used to show the structure of the pressure equalizing orifice plate.
[0031] Figure 5 It is a structural schematic diagram used to show the side of the partition plate.
[0032] Explanation of the reference numerals in the accompanying drawings: 1. Blowing part; 11. Blowing pipe; 111. First branch pipe; 112. Second branch pipe; 113. Oxygen concentration sensor; 114. Wind speed sensor; 12. Pressure equalizing cabin; 121. Pressure equalizing orifice plate; 122. Mounting protrusion; 123. Mounting groove; 13. Blowing head; 131. Air inlet rectangular frame; 132. Speed increasing plate; 133. Speed increasing hole; 2. Air intake part; 21. Air intake pipe; 22. Air intake cabin; 23. Air intake head; 3. First cabin body; 4. Second cabin body; 5. First head body; 6. Second head body; 7. Air outlet rectangular frame; 71. Upper chamber; 72. Lower chamber; 8. Partition plate. DETAILED DESCRIPTION
[0033] The following is combined with Figure 1-5 This application is described in further detail.
[0034] The embodiments of the present application disclose an independent flow field device and a 3D printer for avoiding contamination of lenses and powder-spreading surfaces.
[0035] In a first aspect, the present application discloses an independent flow field device for preventing contamination of lenses and powdering surfaces: Reference Figure 1-2, an independent flow field device for avoiding contamination of lenses and powder-spreading surfaces, comprising a blowing part 1 and an air suction part 2, which are arranged on both sides of the molding chamber relatively. The blowing part 1 comprises an air blowing pipe 11, an equalizing chamber 12 and an air blowing head 13, and an oxygen concentration sensor 113 and a wind speed sensor 114 are fixedly installed on the air blowing pipe 11. One end of the equalizing chamber 12 is docked with the air blowing pipe 11, and the other end of the equalizing chamber 12 is docked with the air blowing head 13; the equalizing chamber 12 and the air blowing head 13 are both fixedly installed on the side wall of the molding chamber, the equalizing chamber 12 is located on the outside of the molding chamber, and the air blowing head 13 is located on the inside of the molding chamber, and the docking point between the equalizing chamber 12 and the air blowing head 13 passes through the side wall of the molding chamber; the air blowing head 13 is arranged toward the powder-spreading surface and the lens.
[0036] The air suction part 2 includes an air suction pipe 21, an air suction cabin 22 and an air suction head 23. One end of the air suction cabin 22 is connected to the air suction pipe 21, and the other end of the air suction cabin 22 is connected to the air suction head 23. The air suction cabin 22 and the air suction head 23 are both fixedly installed on the side wall of the molding chamber, and the air suction cabin 22 is located outside the molding chamber, and the air suction head 23 is located inside the molding chamber. The connection between the air suction cabin 22 and the air suction head 23 passes through the side wall of the molding chamber.
[0037] When laser melting is performed in the molding chamber, gas is introduced into the blowing pipe 11, and the gas is blown out from the suction head 23 after passing through the suction cabin 22. Since the blowing head 13 is arranged toward the powder-laying surface and the lens, the black smoke just generated on the powder-laying surface and the black smoke escaping to the lens are blown to the side where the suction head 23 is located, and the suction pipe 21 can inhale air through an external fan, thereby sucking the black smoke out from the suction head 23, the suction cabin 22 and the suction pipe 21 in turn, reducing the pollution of the powder-laying surface and the lens caused by the black smoke.
[0038] Reference Figure 1-3 The pressure-equalizing chamber 12 includes a first chamber 3 and a second chamber 4, and the air blowing head 13 includes a first head 5 and a second head 6. The first chamber 3 and the first head 5 are connected to each other, and the second chamber 4 and the second head 6 are connected to each other. The first head 5 is arranged toward the lens, and the second head 6 is arranged toward the powdering surface. The air blowing pipe 11 is connected to the first chamber 3 and the second chamber 4 through the first branch pipe 111 and the second branch pipe 112 respectively. Blowing air to the powdering surface and the lens respectively helps to improve the accuracy and efficiency of blowing away the black smoke.
[0039] Reference Figure 3-4The pressure-equalizing chamber 12 is gradually expanded from the blowing pipe 11 toward the blowing head 13. The blowing head 13 includes an air intake rectangular frame 131 and a speed-increasing plate 132 fixedly connected to the air intake rectangular frame 131. A plurality of speed-increasing holes 133 are provided on the speed-increasing plate 132. The opening at one end of the air intake rectangular frame 131 is connected to the pressure-equalizing chamber 12, and the opening at the other end of the air intake rectangular frame 131 is connected to the speed-increasing holes 133. The gas in the blowing pipe 11 enters the pressure-equalizing chamber 12 and the air intake rectangular frame 131 in turn, and then is blown out through the speed-increasing holes 133. The pressure-equalizing chamber 12 is gradually expanded from the blowing pipe 11 toward the blowing head 13, which can make the gas in the blowing pipe 11 gradually diffuse in the pressure-equalizing chamber 12, thereby increasing the gas blowing area; through the setting of the speed-increasing holes 133, the blown gas can be accelerated, so as to blow away the black smoke.
[0040] Reference Figure 1 and Figure 3-4 , multiple pressure equalizing orifice plates 121 are arranged in the pressure equalizing chamber 12 at intervals along the gradually expanding direction of the pressure equalizing chamber 12. The multiple pressure equalizing orifice plates 121 can gradually diffuse the gas flowing through the pressure equalizing chamber 12, thereby improving the diffusion effect and further improving the pressure equalization effect, so that the gas in the pressure equalizing chamber 12 can enter the air intake rectangular frame 131 over a large area, thereby preventing the gas in the pressure equalizing chamber 12 from entering the air intake rectangular frame 131 from the middle, thereby preventing the gas from being concentratedly blown out, resulting in a situation where only local black smoke can be blown away.
[0041] Reference Figure 3-4 , a plurality of mounting protrusions 122 are fixedly connected on both sides of the pressure equalizing orifice plate 121 in the width direction, and mounting grooves 123 for corresponding insertion of the mounting protrusions 122 are provided on the top and bottom walls of the pressure equalizing chamber 12. It is convenient for the installation of the pressure equalizing orifice plate 121. The thickness of the pressure equalizing chamber 12 is gradually reduced from the blowing pipe 11 toward the blowing head 13, which is helpful to pressurize and accelerate the gas in the pressure equalizing chamber 12. The speed increasing holes 133 are arranged in a triangular shape. If the speed increasing holes 133 of the same area and number are circular, the wind speed will be very fast and the black smoke cannot be blown away well; if a square shape is adopted, although it has a better effect than a circular shape, the processing cost of the square hole is high. The speed increasing holes 133 of the present application are arranged in a triangular shape, which is convenient for reasonably controlling the blowing wind speed and saving processing costs.
[0042] Referring to the figure, the length of the first head body 5 is smaller than that of the second head body 6, and the size of the speed increasing hole 133 on the first head body 5 is larger than the size of the speed increasing hole 133 on the second head body 6; the distance between the lowest point of the speed increasing hole 133 on the first head body 5 and the bottom surface of the speed increasing plate 132 on the first head body 5 is the first distance, and the distance between the lowest point of the speed increasing hole 133 on the second head body 6 and the bottom surface of the speed increasing plate 132 on the second head body 6 is the second distance, and the second distance is larger than the first distance.
[0043] The length of the first head body 5 is shorter than that of the second head body 6 because the wind blown out by the second head body 5 needs to cover the entire printing arc surface at the powder spreading surface, so the length is longer. The first head body 6 is mainly used for cleaning, so it does not need to be longer.
[0044] The size of the speed increasing hole 133 on the first head body 5 is larger than that of the speed increasing hole 133 on the second head body 6. This is because the wind blown out by the second head body 5 acts on the lens, and the wind blown out by the second head body 6 acts on the powder spreading surface. The powder spreading surface is where black smoke emerges, and there is more black smoke. Therefore, the size of the speed increasing hole 133 there is smaller than that of the speed increasing hole 133 at the lens, that is, the wind speed acting on the powder spreading surface is greater than the wind speed at the lens.
[0045] In addition, the printed arc surface, that is, the powder-laying surface where the laser acts, is a metal powder. The black smoke generated by laser melting will be cached for about ten millimeters. It will be cached. The second distance is greater than the first distance, which can make the blowing point have a suitable distance from the powder-laying surface, quickly blow away the black smoke cached on the powder-laying surface, and not blow away the unformed powder. The small amount of black smoke that cannot be blown away will escape to the lens. The speed-increasing hole 133 has a suitable distance from the lens, which is compatible with the blowing position, and the first head body 5 will blow away the black smoke at the lens.
[0046] Reference Figure 1 and Figure 5 The air intake head 23 includes an air outlet rectangular frame 7 and a partition plate 8. The partition plate 8 is obliquely arranged in the air outlet rectangular frame 7 and divides the air outlet rectangular frame 7 into an upper chamber 71 and a lower chamber 72. The upper chamber 71 and the lower chamber 72 are both connected to the air outlet cabin; the lowest side of the partition plate 8 is farther away from the air outlet cabin than the highest side, and there are gaps between the top and bottom surfaces of the partition plate 8 and the inner wall of the air outlet rectangular frame 7.
[0047] If the partition plate 8 is not provided, when the black smoke is sucked out through the air outlet rectangular frame 7, a lot of black smoke will accumulate around the air outlet rectangular frame 7, and even when the speed of the black smoke blowing in is fast, the black smoke will be directly blown onto the air outlet rectangular frame 7. By providing the partition plate 8, the black smoke can be sucked out from the upper chamber 71 and the lower chamber 72, most of the black smoke is directly sucked out from the upper chamber 71, and a small part of the black smoke is sucked out from the lower chamber 72, and at the same time, a suction wind speed difference is generated between the upper chamber 71 and the lower chamber 72, which helps to fully suck out the blowing black smoke.
[0048] The implementation principle of an independent flow field device for avoiding contamination of lenses and powdered surfaces in an embodiment of the present application is as follows: gas is introduced into the blowing pipe 11, and the gas is blown out from the suction head 23 after passing through the suction cabin 22. Since the blowing head 13 is arranged toward the powdered surface and the lens, the black smoke just generated on the powdered surface and the black smoke escaping to the lens are blown to the side where the suction head 23 is located, and the suction pipe 21 can inhale air through an external fan, thereby sucking out the black smoke from the suction head 23, the suction cabin 22 and the suction pipe 21 in turn, reducing the contamination of the powdered surface and the lens caused by the black smoke.
[0049] In a second aspect, the present application discloses a 3D printer: A 3D printer comprises the above-mentioned independent flow field device for avoiding contamination of lenses and powder spreading surfaces.
[0050] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. An independent flow field device for avoiding contamination of lens and powdering surface, characterized in that: It comprises an air blowing part (1) and an air suction part (2), wherein the air blowing part (1) and the air suction part (2) are arranged oppositely on two sides of a molding chamber; The blowing part (1) comprises a blowing pipe (11), a pressure equalizing chamber (12) and a blowing head (13); one end of the pressure equalizing chamber (12) is connected to the blowing pipe (11), and the other end of the pressure equalizing chamber (12) is connected to the blowing head (13); the pressure equalizing chamber (12) and the blowing head (13) are both fixedly mounted on the side wall of the molding chamber, the pressure equalizing chamber (12) is located on the outside of the molding chamber, and the blowing head (13) is located on the inside of the molding chamber, and the connection between the pressure equalizing chamber (12) and the blowing head (13) passes through the side wall of the molding chamber; the blowing head (13) is arranged toward the powder spreading surface and the lens; The air suction part (2) comprises an air suction pipe (21), an air suction chamber (22) and an air suction head (23); one end of the air suction chamber (22) is connected to the air suction pipe (21), and the other end of the air suction chamber (22) is connected to the air suction head (23); the air suction chamber (22) and the air suction head (23) are both fixedly mounted on the side wall of the molding chamber, and the air suction chamber (22) is located outside the molding chamber, and the air suction head (23) is located inside the molding chamber, and the connection between the air suction chamber (22) and the air suction head (23) passes through the side wall of the molding chamber.
2. An independent flow field device for avoiding contamination of lens and powder spreading surface according to claim 1, characterized in that: The pressure equalizing chamber (12) comprises a first chamber body (3) and a second chamber body (4); the air blowing head (13) comprises a first head body (5) and a second head body (6); the first chamber body (3) and the first head body (5) are connected to each other, the second chamber body (4) and the second head body (6) are connected to each other, the first head body (5) is arranged toward the lens, and the second head body (6) is arranged toward the powder spreading surface; The air blowing pipe (11) is connected to the first cabin (3) and the second cabin (4) respectively through a first branch pipe (111) and a second branch pipe (112).
3. An independent flow field device for avoiding contamination of lens and powder spreading surface according to claim 2, characterized in that: The pressure equalizing chamber (12) is gradually expanded from the air blowing pipe (11) toward the air blowing head (13); the air blowing head (13) comprises an air intake rectangular frame (131) and a speed increasing plate (132) fixedly connected to the air intake rectangular frame (131); a plurality of speed increasing holes (133) are provided on the speed increasing plate (132); an opening at one end of the air intake rectangular frame (131) is connected to the pressure equalizing chamber (12); and an opening at the other end of the air intake rectangular frame (131) is connected to the speed increasing hole (133).
4. An independent flow field device for preventing contamination of lens and powder spreading surface according to claim 3, characterized in that: A plurality of pressure equalizing orifice plates (121) are arranged in the pressure equalizing chamber (12) at intervals along the gradually expanding direction of the pressure equalizing chamber (12).
5. An independent flow field device for preventing contamination of lens and powdering surface according to claim 4, characterized in that: A plurality of mounting protrusions (122) are fixedly connected to both sides of the pressure equalizing orifice plate (121) in the width direction, and mounting grooves (123) for corresponding insertion of the mounting protrusions (122) are provided on the top wall and the bottom wall of the pressure equalizing chamber (12).
6. An independent flow field device for preventing contamination of lens and powdering surface according to claim 3, characterized in that: The thickness of the pressure equalizing chamber (12) is gradually reduced in a direction from the air blowing pipe (11) toward the air blowing head (13).
7. An independent flow field device for preventing contamination of lens and powder spreading surface according to claim 3, characterized in that: The speed increasing hole (133) is arranged in a triangular shape.
8. The independent flow field device for preventing contamination of lens and powder spreading surface according to claim 3, characterized in that: The length of the first head body (5) is smaller than the length of the second head body (6), and the size of the speed-increasing hole (133) on the first head body (5) is larger than the size of the speed-increasing hole (133) on the second head body (6); the distance between the lowest point of the speed-increasing hole (133) on the first head body (5) and the bottom surface of the speed-increasing plate (132) on the first head body (5) is a first distance, and the distance between the lowest point of the speed-increasing hole (133) on the second head body (6) and the bottom surface of the speed-increasing plate (132) on the second head body (6) is a second distance, and the second distance is larger than the first distance.
9. The independent flow field device for preventing contamination of lens and powdering surface according to claim 1, characterized in that: The air suction head (23) comprises an air outlet rectangular frame (7) and a partition plate (8); the partition plate (8) is obliquely arranged in the air outlet rectangular frame (7) and divides the air outlet rectangular frame (7) into an upper chamber (71) and a lower chamber (72); the upper chamber (71) and the lower chamber (72) are both connected to the air outlet chamber; the lowest side of the partition plate (8) is farther away from the air outlet chamber than the highest side; and there is a gap between the top surface and the bottom surface of the partition plate (8) and the inner wall of the air outlet rectangular frame (7).
10. A 3D printer, characterized in that: An independent flow field device for avoiding contamination of a lens and a powder spreading surface as described in any one of claims 1 to 9.