3D printer

Abstract

3D printer, characterized in that the 3D printer comprises the following: a housing that is equipped with a pressure chamber; a print module arranged in the print chamber, wherein the print module includes a nozzle, the nozzle being used to extrude the printing material; and A cooling air supply system comprising an airflow generator and an air supply element, wherein the airflow generator is connected to the housing, wherein the air supply element is connected to the pressure module and is provided with an annular space, wherein the pressure module is arranged to pass through the annular space, wherein the air supply element is provided with an air inlet and an air outlet, wherein the air inlet is connected to the outlet end of the airflow generator, and wherein the air outlet is used to discharge the air towards the nozzle.

Description

TECHNICAL AREA

[0001] The utility model relates to the technical field of 3D printing, in particular to a 3D printer. STATE OF THE ART

[0002] In 3D printing technology, after the extrusion machine has extruded the printing material according to the printing requirements, it must be cooled quickly so that it can solidify its shape as soon as possible to meet the printing requirements. Existing 3D printers generally use cooling fans to cool the printing materials.

[0003] However, to ensure the cooling speed, the speed of the cooling fan is usually very high, which leads to vibrations and a lot of noise, which is not conducive to creating a comfortable user environment, this also affects the printing accuracy of the extrusion system and is not conducive to the final printing effect. CONTENT OF THE PRESENT APPLICATION

[0004] The main purpose of the utility model is to provide a 3D printer that aims to reduce cooling noise, continuously provide cooling air with positive pressure for molten material, and improve the cooling effect on the molten material.

[0005] To achieve the aforementioned purpose, the present utility model provides a 3D printer which includes the following: a housing that is equipped with a pressure chamber; a print module arranged in the print chamber, wherein the print module includes a nozzle, the nozzle being used to extrude the printing material; and A cooling air supply system comprising an airflow generator and an air supply element, wherein the airflow generator is connected to the housing, wherein the air supply element is connected to the pressure module and is provided with an annular space, wherein the pressure module is arranged to pass through the annular space, wherein the air supply element is provided with an air inlet and an air outlet, wherein the air inlet is connected to the outlet end of the airflow generator, and wherein the air outlet is used to discharge the air towards the nozzle.

[0006] In one embodiment, the air supply element comprises an air inlet channel and an air outlet channel connected at an angle to each other, wherein the air inlet channel is provided with an air inlet and is connected to the outlet end of the airflow generator, and wherein the air outlet channel is provided with an annular space and an air outlet.

[0007] In one embodiment, the air outlet duct comprises at least two branching sections, wherein the two branching sections enclose and form an annular space, and each of the branching sections is provided with at least one air outlet.

[0008] In one embodiment, the branching section is provided to have at least a first section and a second section which are connected at an angle to each other, wherein the second section is arranged on a side of the first section facing away from the air inlet channel, and wherein an end of the second section facing away from the first section is provided with an air outlet.

[0009] In one embodiment, the air outlet duct is arranged in a ring shape, with several air outlets being present, wherein the several air outlets are arranged at intervals in the air outlet duct; and / or wherein the connection between the air intake duct and the air outlet duct is a smooth transition.

[0010] In one embodiment, the cooling air supply system also includes a telescopic tube, wherein one end of the telescopic tube is connected to the output end of the airflow generator and the other end of the telescopic tube is connected to the air supply element.

[0011] In one embodiment, a mounting frame is provided on the side of the housing facing away from the pressure chamber, wherein the airflow generator is mounted on the mounting frame, wherein the housing is also provided with a through-hole that is connected to the pressure chamber, wherein the telescopic tube is guided through the through-hole to connect the airflow generator to the air supply element.

[0012] In one embodiment, the cooling air supply system also includes a filter device, wherein the filter device is arranged at the inlet end or outlet end of the airflow generator and is used to filter the continuous positive pressure airflow provided by the airflow generator.

[0013] In one embodiment, the filter device comprises a mounting frame and a filter element, wherein the mounting frame is connected to the airflow generator and encloses and forms a mounting chamber as well as an inlet and an outlet connected to the mounting chamber, wherein the filter element is detachably arranged in the mounting chamber, wherein the inlet is used for the airflow to enter the filter element, and wherein the outlet closes the inlet end of the airflow generator.

[0014] In one embodiment, the cooling air supply system also includes an electronic control device, wherein the electronic control device is electrically connected to the airflow generator and is used to control the operation of the airflow generator.

[0015] The air supply element in the technical solution of the present utility model has an air inlet and an air outlet. The air inlet of the air supply element is connected to the outlet end of the airflow generator. The pressure module includes a nozzle, and the air outlet of the air supply element is arranged in the extrusion direction of the nozzle to cool the molten material extruded by the nozzle. The airflow generator supplies a continuous airflow at positive pressure to the air supply element, thus continuously delivering air to cool the molten material and ensuring a cooling effect. Compared to conventional cooling solutions with a fan, the airflow generator produces less noise during operation and provides a strong airflow, offering the user a comfortable working environment. The air supply element has an annular chamber.During the assembly of the cooling air supply system, the print module is positioned through the annular space. This allows the air outlet of the air supply element to be located close to the extrusion opening of the die, thus improving the cooling efficiency of the molten material. The airflow generator and the air supply element are arranged separately; the airflow generator is mounted on the housing, and the air supply element is mounted on the print module. During printing, only the air supply element moves with the print module, and the vibration generated by the airflow generator is not transmitted to the print module. This reduces the influence of the cooling air supply system on the control accuracy of the print module and improves its printing accuracy. BRIEF DESCRIPTION OF THE DRAWING

[0016] To clarify the technical solutions of the embodiments of the present utility model or in the prior art, the drawings necessary for the descriptions in embodiments or in the prior art are briefly described below. Obviously, the accompanying drawings in the following description are merely some embodiments of the present utility model, and the person skilled in the art in this field can obtain other drawings without creative effort based on the structures shown in these drawings. Fig. Figure 1 is a schematic structural representation of a cooling air supply system in an embodiment provided by the present utility model; Fig. Figure 2 is a schematic structural representation of the assembly of an air supply element in an embodiment provided by the present utility model. Description of the reference symbols:

[0017] 100. Cooling air supply system; 1. Airflow generator; 2. Air supply element; 21. Air inlet duct; 211. Air inlet; 22. Air outlet duct; 221. Branching section; 2211. First section; 2212. Second section; 2213. Air outlet; 23. Annular chamber; 3. Telescopic tube; 4. Filter device; 5. Electronic control device; 6. Pressure module; 61. Nozzle.

[0018] The realization of the purpose, functional features and advantages of the utility model are further explained with reference to the attached drawings in combination with the exemplary embodiments. Detailed description

[0019] The technical solutions in the embodiments of this utility model are described clearly and completely below with reference to the drawings in those embodiments. Obviously, the described embodiments are only some of the embodiments of this utility model, not all of them. All other embodiments that a person skilled in the art in this field could derive from the embodiments in this utility model without any creative activity are within the scope of protection of this utility model.

[0020] It should be noted that, where directional terms (such as up, down, left, right, front, back, etc.) are used in the embodiments of this utility model, these directional terms are used exclusively to explain the relative position, movement, and the like between the individual components in a specific position. If the specific position changes, the directional term changes accordingly.

[0021] Furthermore, where descriptions relating to "first," "second," and the like appear in the embodiments of this utility model, these descriptions serve only descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly explaining the set of technical features specified. Thus, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. Moreover, the meaning of "and / or" or "or / and," which appears throughout the text, encompasses three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that satisfies both A and B simultaneously.Furthermore, the technical solutions of the various embodiments can be combined, but this must be based on the knowledge of the average person skilled in the art in this field.

[0022] If the combination of technical solutions contradicts each other or cannot be implemented, it should be assumed that the combination of technical solutions does not exist and does not fall within the scope of protection required by the utility model.

[0023] Exemplary embodiments of the present utility model represent a 3D printer with reference to Fig. 1 and Fig. 2. The 3D printer comprises a housing, a print module 6, and a cooling air supply system 100. The housing is provided with a print chamber. The print module 6 is arranged in the print chamber and includes a nozzle 61 for extruding printing material. The cooling air supply system 100 comprises an airflow generator 1 and an air supply element 2. The airflow generator 1 is connected to the housing. The air supply element 2 is connected to the print module 6 and is provided with an annular space 23. The print module 6 is arranged to pass through the annular space 23, and the air supply element 2 is provided with an air inlet 211 and an air outlet 2213. The air inlet 211 is connected to the outlet end of the airflow generator 1, and the air outlet 2213 serves to supply air to the nozzle for cooling the printing material.

[0024] It is understood that the housing serves as a supporting part of the 3D printer, and that the heated bed mechanism and the mechanism of the print module 6 are both located on the housing and within the print chamber. The heated bed mechanism is equipped with a print surface, and the print module 6 extrudes the molten material through the extrusion opening of the nozzle 61 onto the print surface, forming a printed element after cooling and shaping.

[0025] In the present embodiment, the air supply element 2 is provided with an air inlet 211 and an air outlet 2213, and the air inlet 211 of the air supply element 2 is connected to the outlet end of the airflow generator 1. The air outlet 2213 of the air supply element 2 is arranged in the extrusion direction of the die 61 to deliver air for cooling the molten material extruded by the die 61. The airflow generator 1 supplies a continuous airflow at positive pressure to the air supply element 2, thus continuously delivering air for cooling the molten material and ensuring a cooling effect on the molten material. The airflow generator 1 produces little noise during operation and provides a gentler breeze, creating a pleasant working environment for the users.The air supply element 2 is provided with an annular chamber 23. During assembly of the cooling air supply system 100, the pressure module 6 is positioned through the annular chamber 23. This allows the air outlet 2213 of the air supply element 2 to be located close to the extrusion opening of the nozzle 61, thereby improving the cooling efficiency of the molten material. The airflow generator 1 can be an air pump, a radial fan, a turbo fan, a blower, or any other component capable of generating an airflow and creating an air pressure differential. The airflow generator 1 serves to generate positive air pressure and airflow and can create a continuous air pressure differential at the air outlet 2213 of the air supply element 2, which contributes to improving the cooling effect of the printing material during the printing process.

[0026] Simultaneously, the airflow generator 1 and the air supply element 2 are provided separately; the airflow generator 1 is mounted on the housing, and the air supply element 2 is mounted on the pressure module 6. During printing, only the air supply element 2 moves with the pressure module 6, and the vibration generated by the airflow generator 1 is not transmitted to the pressure module 6. This reduces the influence of the cooling air supply system 100 on the control accuracy of the pressure module 6 and improves the printing accuracy of the pressure module 6.

[0027] Optionally, a silencer can be provided at the outlet end of the airflow generator 1, and the positive pressure airflow is transferred through the silencer to the air supply element 2, thereby further reducing the noise of the airflow generator 1 and minimizing noise pollution in the surrounding area. The air supply element 2 can be made of plastic.

[0028] In the actual implementation, the pressure chamber can be a relatively enclosed space during printing, and the airflow generator 1 can be positioned inside or outside the pressure chamber, which is not specifically limited herein. In one embodiment, the printing mechanism comprises a sliding device and a pressure module 6, the pressure module 6 being connected to the output end of the sliding device. During printing, the sliding device moves the pressure module 6 along the printing plane, and the air supply element 2 can also be connected to the output end of the sliding device and does not directly contact the pressure module 6. This reduces damage to the air supply element 2 from the high temperature of the pressure module 6 during operation and extends the service life of the air supply element 2.

[0029] In one embodiment of the present utility model, as in Fig. 1 and Fig. As shown in Figure 2, the air supply element 2 comprises an air inlet channel 21 and an air outlet channel 22, which are connected at an angle to each other; the air inlet channel 21 is provided with an air inlet 211 and is connected to the outlet end of the airflow generator 1; the air outlet channel 22 is provided with an annular space 23 and an air outlet 2213.

[0030] In the present embodiment, the air inlet channel 21 and the air outlet channel 22 are arranged at an angle to each other. The air inlet channel 21 is provided with an air inlet 211, and the air inlet 211 is connected to the outlet end of the airflow generator 1 via a connecting pipe. It is understood that the connecting pipe is connected to the air inlet channel 21 from the side of the pressure module 6 facing away from the pressure plane, in order to facilitate the arrangement of the connecting pipe and to prevent it from interfering with the normal printing process of the pressure module 6. Therefore, the air inlet channel 21 is arranged along the direction of extension of the pressure module 6, and the air inlet 211 is located at the end of the air inlet channel 21 facing away from the heated bed mechanism, in order to facilitate the connection between the air inlet channel 21 and the airflow generator 1.The air outlet channel 22 extends to the extrusion opening of the nozzle 61, so that the air outlet 2213 is directly opposite the molten material ejected from the nozzle 61, thereby improving the cooling efficiency and cooling effect of the cooling air supply system 100.

[0031] In the actual implementation, the extension direction of the print module 6 is perpendicular to the print plane, and the air inlet channel 21 can also be arranged approximately parallel to the extension direction of the print module 6 to facilitate the connection with the print module 6 and also to facilitate the connection with the airflow generator 1 from the end that points away from the print plane; the air outlet channel 22 can be arranged parallel to the print plane or at an angle to the print plane, the lowest point of the air outlet channel 22 does not exceed the plane in which the extrusion opening of the nozzle 61 is located in order to avoid a collision with the print plane during printing.

[0032] It is understandable that the air outlet 2213 is not located directly opposite the nozzle 61, but rather below it. The air outlet blows air directly to cool the surface of the molten material that has just been extruded by the nozzle 61. This prevents any impairment of the extrusion effect of the nozzle 61 and simultaneously allows the extruded molten material to cool rapidly, ensuring printing accuracy. The air supply element 2 can be formed as a single piece.

[0033] In one embodiment of the present utility model, as in Fig. 1 and Fig. As shown in Figure 2, the air outlet duct 22 comprises at least two branching sections 221, and the two branching sections 221 enclose and form an annular space 23, and each branching section 221 is provided with at least one air outlet 2213.

[0034] In the present embodiment, the two branching sections 221 enclose and form an annular space 23 for the passage of the pressure module 6. At one end, facing away from the air inlet duct 21, the two branching sections 221 are not connected to each other; that is, the annular space 23 enclosed and formed by the two branching sections 221 has a recess to facilitate the installation of the pressure module 6 into the pressure space. It is understood that by providing the recess, the obstruction of the stroke of the pressure module 6 by the air outlet section can be reduced, and the restriction of the cooling air supply system 100 to the pressure module 6 can be lessened.

[0035] In the actual implementation, the two branching sections 221 extend symmetrically on both sides of the pressure module 6, and the air outlets 2213 attached to the branching sections 221 are also arranged symmetrically to ensure a uniform air outlet to the molten material and to improve the cooling effect of the molten material.

[0036] Optionally, the air outlet 2213 is provided at an end of the branching section 221 facing away from the air inlet duct 21, and the nozzle 61 is located in the recess, so that the air outlet 2213 is positioned directly below the nozzle 61. The air outlet duct 22 also comprises a main section connected to the air inlet duct 21, and the branching section 221 connected to the side of the main section facing away from the air inlet duct 21. The main section directs the positive-pressure airflow entering from the air inlet duct 21 to each branching section 221. Furthermore, the corners of the air inlet duct 21, the main section, and the branching section 221 are all provided with arcuate chamfers to reduce the resistance of the positive-pressure airflow transmitted in the air supply element 2 and to improve the cooling effect of the cooling air supply system 100.

[0037] In one embodiment of the present utility model, as in Fig. As shown in Figure 2, the branching section 221 is provided to have at least a first section 2211 and a second section 2212, which are connected at an angle to each other, the second section 2212 being located on a side of the first section 2211 facing away from the second section 2212, wherein an end of the second section 2212 facing away from the first section 2211 is provided with an air outlet 2213.

[0038] It is understood that the air inlet channel 21 is generally provided on one side of the pressure module 6, the branching section 221 in the present embodiment comprises a first section 2211 and a second section 2212, the first section 2211 extends from the air inlet channel 21 in a direction away from the pressure module 6, the second section 2212 extends from the first section 2211 in the direction of the pressure module 6, thereby bypassing the main body of the pressure module 6 and allowing the air outlet 2213 to be arranged near the extrusion opening of the nozzle 61.

[0039] In the actual implementation, the branching section 221 can be arranged in three sections, four sections, or in an arc shape, which is not specifically limited here. In the projection perpendicular to the printing direction of the printing module 6, the annular space 23 can be approximately rhomboid, rectangular, circular, or elliptical, which is not specifically limited here.

[0040] In one embodiment of the present utility model, as in Fig. 1 and Fig. As shown in Figure 2, the air outlet duct 22 is arranged in a ring shape and has several air outlets 2213 arranged at intervals in the air outlet duct 22.

[0041] In the present embodiment, the air outlet channel 22 is arranged in an annular form, and the air outlets 2213 are arranged at intervals along the air outlet channel 22 to further improve the uniformity of the air outlet to the molten material and to ensure the cooling effect on the molten material. The air outlets 2213 can be evenly distributed along the air outlet channel 22. The multiple air outlets 2213 are all arranged towards the bottom of the nozzle 61 to cool the molten material from different directions and thereby improve the cooling efficiency.

[0042] In one embodiment of the present utility model, the connection between the air inlet channel 21 and the air outlet channel 22 is a smooth transition. This reduces the resistance of the positive pressure airflow from the air inlet channel 21 to the air outlet channel 22, reduces the noise generated by the positive pressure airflow during conveying, improves the air supply efficiency of the air supply element 2, and ensures the cooling efficiency of the molten material.

[0043] In one embodiment of the present utility model, as in Fig. As shown in Figure 1, the cooling air supply system 100 further comprises a telescopic tube 3, one end of which is connected to the outlet end of the airflow generator 1 and the other end of which is connected to the air supply element 2. The telescopic tube 3 can be a hose.

[0044] In the present embodiment, the air supply element 2 and the airflow generator 1 are connected via a telescopic tube 3. During printing, the air supply element 2 moves together with the printing module 6, and the telescopic tube 3 automatically adjusts to the distance between the air supply element 2 and the airflow generator 1, thus exhibiting a high degree of flexibility. It is understood that the telescopic tube 3 serves as the connecting tube between the airflow generator 1 and the air supply element 2. This effectively avoids the time-consuming adjustment of the connecting tube between the airflow generator 1 and the air supply element 2 and prevents sagging of the connecting tube, which would impair the normal shape of the printing element.

[0045] In the actual implementation, the diameter of the end of the air inlet duct 21 facing the air inlet 211 corresponds to the inner diameter of the telescopic tube 3. The telescopic tube 3 can be placed onto the air inlet duct 21 and tightened with a clamp to establish the connection between the telescopic tube 3 and the air supply element 2. Similarly, the diameter of the outlet end of the airflow generator 1 corresponds to the inner diameter of the telescopic tube 3. The telescopic tube 3 is placed onto the outlet end of the airflow generator 1 and tightened with a clamp to establish the connection between the telescopic tube 3 and the airflow generator 1.

[0046] In one embodiment of the present utility model, as in Fig. As shown in Figure 1, a mounting frame is provided on the side of the housing facing away from the pressure chamber, on which the airflow generator 1 is mounted. The housing is also provided with a through-hole to the pressure chamber, through which the telescopic tube 3 is guided to connect the airflow generator 1 to the air supply element 2.

[0047] In the present embodiment, the airflow generator 1 is arranged outside the pressure chamber, and the housing is provided with a mounting frame outside the pressure chamber. The airflow generator 1 is attached to the housing via the mounting frame, and the housing has a through-hole through which the telescopic tube 3 can pass, so that the airflow generator 1 is connected to the air supply element 2 in the pressure chamber. The mounting frame is also provided with a mounting recess whose size corresponds to that of the airflow generator 1 in order to position and confine the airflow generator 1 and to prevent excessive vibration of the airflow generator 1 during operation.

[0048] It is understandable that during operation of the 3D printer, the heated bed mechanisms and the print module 6 heat up, so that the temperature outside the print chamber is lower than the temperature inside the print chamber. The airflow generator 1 supplies low-temperature air from outside the print chamber to the air supply element 2, thereby improving the cooling efficiency of the cooling air supply system 100 for the molten material.

[0049] In the actual implementation, the mounting frame is attached to the rear of the housing via a quick-release mechanism. Similarly, the telescopic tube 3 extends from the rear of the housing into the printing chamber; this not only contributes to the aesthetics of the 3D printer but also facilitates the connection of the airflow generator 1 to the 3D printer's electronic control system.

[0050] In one embodiment of the present utility model, as in Fig. As shown in Figure 1, the cooling air supply system 100 further comprises a filter device 4, and the filter device 4 is arranged at an inlet end or an outlet end of the airflow generator 1 and is designed to filter the continuous positive pressure airflow provided by the airflow generator 1.

[0051] In the present embodiment, the filter device 4 is used to filter the positive pressure airflow directed from the airflow generator 1 to the air supply element 2, thus preventing dust or other foreign matter from being expelled from the air outlet 2213 along with the positive pressure airflow and adhering to the surface of the printing element, which would impair the print quality of the 3D printer.

[0052] In the actual implementation, the filter device 4 can be installed at the inlet end of the airflow generator 1, i.e., at the air inlet of the airflow generator 1, or it can be installed at the outlet end of the airflow generator 1, i.e., at the air outlet of the airflow generator 1. Both methods can filter the positive-pressure airflow directed into the air supply element 2 to ensure the quality of the pressure element. In some embodiments, the filter device 4 can also be arranged at the end of the telescopic tube 3 or at the air inlet 211 of the air supply element 2.

[0053] In one embodiment of the present utility model, as in Fig. As shown in Figure 1, the filter device 4 comprises a mounting frame and a filter element. The mounting frame is connected to and encloses the airflow generator 1, forming a mounting chamber, an inlet, and an outlet connected to the mounting chamber. The filter element is detachably arranged in the mounting chamber. The inlet serves to introduce the airflow into the filter element, and the outlet closes the inlet end of the airflow generator 1 by covering it.

[0054] In the present embodiment, the filter device 4 is arranged at the inlet end of the airflow generator 1. The filter element can consist of filter cotton, filter fabric, or the like, and the filter element closes the inlet end of the airflow generator 1 by means of a mounting frame in order to filter the airflow pumped in by the airflow generator 1. When the cooling air supply system 100 is in operation, air flows in from the inlet of the mounting frame, is filtered by the filter element, and then passes from the outlet into the inlet end of the airflow generator 1 and is then pumped by the airflow generator 1 into the air supply element 2.

[0055] In the actual implementation, the mounting frame is connected to the airflow generator 1 or the mounting frame on which the airflow generator 1 is mounted via a quick-release structure to facilitate the assembly and disassembly of the filter device 4. The mounting frame can comprise two detachably connected housing parts, with the filter element confined between the two housing parts to facilitate replacement of the filter element.

[0056] In one embodiment of the present utility model, as in Fig. As shown in Figure 1, the cooling air supply system 100 is provided to further include an electronic control device 5 which is electrically connected to the airflow generator 1 and serves to control the operation of the airflow generator 1.

[0057] In the present embodiment, the operating power of the airflow generator 1 can be controlled by the electronic control device 5, and the user can adjust the air supply power of the cooling air supply system 100 according to the actual pressure requirements. The electronic control device 5 can be integrated on a printed circuit board, which can be mounted on a mounting frame that secures the airflow generator 1 and is coupled to the control system of the 3D printer. The user can control the operating status of the airflow generator 1 via a control panel of the 3D printer, for example, whether the cooling air supply system 100 starts cooling and the airflow speed of the cooling air supply system 100.

[0058] In the actual implementation, an air pressure sensor can also be provided at the output end of the airflow generator 1. The air pressure sensor is used to monitor whether the positive pressure airflow of the cooling air supply system 100 is normal. The air pressure sensor is electrically connected to the electronic control device 5. The air pressure sensor transmits the air pressure of the positive pressure airflow to the electronic control device 5. The electronic control device 5 can determine whether the air pressure of the positive pressure airflow is within a preset range in order to determine whether the airflow generator 1, the air supply element 2, or the connecting pipe are functioning normally.If the air pressure of the positive pressure airflow is not within a preset range, the electronic control device 5 issues an alarm to the user so that the user can immediately check the fault to avoid any impairment of print quality.

[0059] The above are merely exemplary embodiments of the present utility model and are not intended to limit the scope of the patent. Any equivalent structural transformation produced using the description of the utility model and the content of the accompanying drawings, under the technical concept of the utility model, and used either directly or indirectly in other related technical fields, is all covered by the scope of patent protection of the utility model.

Claims

[1] 3D printers, characterized by , that the 3D printer includes the following: a housing that is equipped with a pressure chamber; a print module arranged in the print chamber, wherein the print module includes a nozzle, the nozzle being used to extrude the printing material; and A cooling air supply system comprising an airflow generator and an air supply element, wherein the airflow generator is connected to the housing, wherein the air supply element is connected to the pressure module and is provided with an annular space, wherein the pressure module is arranged to pass through the annular space, wherein the air supply element is provided with an air inlet and an air outlet, wherein the air inlet is connected to the outlet end of the airflow generator, and wherein the air outlet is used to discharge the air towards the nozzle. [2] 3D printer according to claim 1, characterized by, that the air supply element comprises an air inlet duct and an air outlet duct connected at an angle to each other, wherein the air inlet duct is provided with an air inlet and is connected to the outlet end of the airflow generator, and wherein the air outlet duct is provided with an annular space and an air outlet. [3] 3D printer according to claim 2, characterized by that the air outlet duct comprises at least two branching sections, wherein the two branching sections enclose and form an annular space, each of the branching sections being provided with at least one air outlet. [4] 3D printer according to claim 3, characterized by, that the branching section comprises at least a first section and a second section connected at an angle to each other, wherein the second section is arranged on a side of the first section facing away from the air inlet duct, and wherein an end of the second section facing away from the first section is provided with an air outlet. [5] 3D printer according to claim 2, characterized by , that the air outlet duct is arranged in a ring shape, with several air outlets being present, wherein the several air outlets are arranged at intervals in the air outlet duct; and / or wherein the connection between the air intake duct and the air outlet duct is a smooth transition. [6] 3D printer according to any one of claims 1 to 5, characterized by, that the cooling air supply system also includes a telescopic tube, wherein one end of the telescopic tube is connected to the output end of the airflow generator and the other end of the telescopic tube is connected to the air supply element. [7] 3D printer according to claim 6, characterized by , that a mounting frame is provided on the side of the housing facing away from the pressure chamber, wherein the airflow generator is mounted on the mounting frame, wherein the housing is also provided with a through-hole that is connected to the pressure chamber, wherein the telescopic tube is guided through the through-hole to connect the airflow generator to the air supply element. [8] 3D printer according to any one of claims 1 to 5, characterized bythat the cooling air supply system also includes a filter device, wherein the filter device is arranged at the inlet end or outlet end of the airflow generator and is used to filter the continuous positive pressure airflow provided by the airflow generator. [9] 3D printer according to claim 8, characterized by , that the filter device comprises a mounting frame and a filter element, wherein the mounting frame is connected to the airflow generator and encloses and forms a mounting chamber as well as an inlet and an outlet connected to the mounting chamber, wherein the filter element is detachably arranged in the mounting chamber, wherein the inlet is used for the airflow to enter the filter element, and the outlet closes the inlet end covering the airflow generator. [10] 3D printer according to any one of claims 1 to 5, characterized bythat the cooling air supply system also includes an electronic control device, wherein the electronic control device is electrically connected to the airflow generator and is used to control the operation of the airflow generator.

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