3D printer for printing cavity structure with internal pressure

Abstract

The invention discloses a 3D printer for printing a cavity structure with internal pressure. The 3D printer comprises a printer body; the sealing structure wraps the printer body, and the printer body is sealed in the sealing structure; and the pressure control system is communicated with the sealing structure and is used for changing the air pressure in the sealing structure in the printing process of the printer body. According to the application, the 3D printer is sealed in the sealing structure, and the air pressure in the sealing structure is adjusted in the printing process of the 3D printer through the pressure control system communicated with the sealing structure, so that the air pressure intensity sealed in the cavity structure can be adjusted as required when the cavity structure is printed by the 3D printer; therefore, a cavity structure with pressure inside is manufactured, and more excellent rebound resilience and buffering effect are provided for the product.

Description

Technical Field

[0001] The present application relates to the field of additive manufacturing technology, and in particular, to a 3D printer for printing a cavity structure with internal pressure. Background Art

[0002] Additive manufacturing technology, namely 3D printing technology, has been widely used in the production and manufacturing process of different products due to its flexible design and rapid prototyping characteristics. In the production and manufacturing process, 3D printing technology can manufacture products with personalized designs for users according to needs, meeting the needs of users in different scenarios. In order to ensure the resilience performance of 3D printed products, in the prior art, a cavity structure is often designed on the product structure to form an airbag in the product, thereby providing the required resilience performance and buffering performance. However, due to the limitations of 3D printing technology itself, the cavity structure formed on the product can only ensure that the internal pressure is equal to the external pressure (1 atmospheric pressure), and it is impossible to increase the pressure inside the cavity structure to improve the resilience performance and buffering performance. It is difficult to print a cavity structure with internal pressure, which greatly limits the application scenarios of 3D printing.

[0003] Therefore, the prior art still needs to be improved and developed. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of the present application is to provide a 3D printer for printing a cavity structure with internal pressure, so as to solve the problem that in the prior art, it is impossible to increase the pressure inside the cavity structure obtained by 3D printing to improve the resilience performance and buffering performance, and it is difficult to print a cavity structure with internal pressure, which greatly limits the application scenarios of 3D printing.

[0005] The technical solution of the present application is as follows:

[0006] The present application discloses a 3D printer for printing a cavity structure with internal pressure, wherein the 3D printer includes:

[0007] A printer body;

[0008] A sealing structure that wraps the printer body and seals the printer body inside the sealing structure;

[0009] A pressure control system that communicates with the sealing structure and changes the air pressure inside the sealing structure during the printing process of the printer body.

[0010] In one embodiment, the printer body is one of a material jetting printer, a material extrusion printer, a binder jetting printer, and a stereolithography printer.

[0011] In one embodiment, the sealing structure includes:

[0012] A housing that wraps the printer body;

[0013] A pressure inlet and a pressure relief outlet, which are provided on the side wall of the housing and penetrate the housing;

[0014] A material port, which is provided on the housing and corresponds to the printer body to supply materials to the printer body or take printed products from the printer body.

[0015] In one embodiment, the pressure control system includes:

[0016] A pressurizing device that communicates with the inside of the sealing structure through the pressure inlet to make the air pressure inside the sealing structure greater than the external air pressure during the printing process of the printer body;

[0017] A pressure relief device that communicates with the inside of the sealing structure through the pressure relief outlet to adjust the air pressure inside the sealing structure to be the same as the external air pressure;

[0018] A pressure sensor fixed inside the housing of the sealing structure to monitor the air pressure inside the sealing structure;

[0019] A controller that is respectively communicatively connected to the pressurizing device, the pressure relief device, and the pressure sensor to control the operation of the pressurizing device and the pressure relief device according to the air pressure data monitored by the pressure sensor.

[0020] In one embodiment, the pressurizing device includes:

[0021] An air tank that stores pressurized gas;

[0022] An air pump, one end of which is connected to the air tank, and the other end is communicatively connected to the inside of the sealing structure through the pressure inlet to input the pressurized gas in the air tank into the sealing structure and change the air pressure inside the sealing structure.

[0023] In one embodiment, the pressurizing device includes a plurality of air tanks that store different pressurized gases to switch the type of gas input into the sealing structure as needed.

[0024] In one embodiment, the air pump includes a main variable-frequency air pump and an emergency air pump connected in series to achieve precision control of the air pressure environment inside the sealing structure within ±0.01 MPa.

[0025] In one embodiment, the pressure relief device includes:

[0026] An active valve, which is arranged outside the housing and connected to the pressure relief port, is configured to discharge the gas in the sealing structure after the printing of the printer body is completed, and adjust the air pressure in the sealing structure to be the same as the external air pressure.

[0027] A passive valve, which is connected to the active valve, is configured to open the active valve when the air pressure in the sealing structure is greater than a first threshold value, and discharge the gas in the sealing structure.

[0028] In one embodiment, the pressure relief device further includes:

[0029] A safety valve, which is fixed at the material port, is configured to open the material port when the air pressure in the sealing structure is greater than a second threshold value, and discharge the gas in the sealing structure.

[0030] In one embodiment, the pressure relief device further includes:

[0031] A silencing condensation tower, which is arranged outside the housing and connected to the active valve, is configured to cool down and reduce the noise of the gas in the sealing structure and then discharge it.

[0032] In summary, the present application discloses a 3D printer for printing a cavity structure with internal pressure, including: a printer body; a sealing structure, which wraps the printer body and seals the printer body in the sealing structure; and a pressure control system, which is communicated with the sealing structure and changes the air pressure in the sealing structure during the printing process of the printer body. By sealing the 3D printer in the sealing structure and then adjusting the air pressure in the sealing structure through the pressure control system communicated with the sealing structure during the printing process of the 3D printer, the present application can ensure that the 3D printer can adjust the gas pressure sealed in the cavity structure as needed when printing the cavity structure, so as to manufacture a cavity structure with internal pressure, providing better resilience performance and buffering effect for the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of the 3D printer for printing a cavity structure with internal pressure according to the present application.

[0034] Figure 2 It is a schematic block diagram of the structure of the 3D printer for printing a cavity structure with internal pressure according to the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The present application provides a 3D printer for printing a cavity structure with internal pressure, so as to solve the problem in the prior art that it is impossible to increase the pressure inside the cavity structure obtained by 3D printing to improve the resilience performance and buffering performance, it is difficult to print a cavity structure with internal pressure, which greatly limits the application scenarios of 3D printing. To make the purpose, technical solution and effect of the present application clearer and more definite, the present application is further described in detail below. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] It should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the structure referred to must have a specific orientation or must be constructed in a specific orientation, and should not be construed as a limitation of the present invention.

[0037] In addition, unless otherwise specifically defined for articles in the text, "a" and "the" can generally refer to a single or plural. If there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions appears to be contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] Additive manufacturing technology, that is, 3D printing technology, as an emerging model manufacturing technology, has been gradually applied to the manufacturing processes of different products. After inputting the required structure of the product into 3D printing software, the corresponding product can be manufactured by the way of printing and forming. In this way, it can get rid of the bondage of the mold and can be quickly formed, so as to realize the personalized customization of the product, and different structural designs can be provided for different functional partitions of the product. Among various products, especially in sports equipment products, the resilience performance and buffering performance are both important performances to improve the user experience. To improve the resilience performance and buffering performance of the product, in addition to adjusting the proportion of the printing material, it can also be achieved by adjusting the product design, that is, by adding a cavity structure to the product. However, due to the limitations of 3D printing technology, existing 3D printers cannot directly manufacture a cavity structure with internal pressure during the printing process. If a pressurizing structure is added, the overall 3D printer will be bulky and not conducive to use.

[0039] In view of the above problems, in this application, the 3D printer is sealed in a sealing structure, and the air pressure inside the sealing structure is adjusted during the printing process of the 3D printer through a pressure control system connected to the sealing structure, so as to ensure that the 3D printer can adjust the air pressure of the gas sealed in the cavity structure as needed when printing the cavity structure, thereby manufacturing a cavity structure with internal pressure, providing better resilience performance and buffering effect for the product. Moreover, this application can customize the internal pressure of the cavity structure of the product according to the needs of specific users, provide different internal pressure designs for different functional partitions, so as to meet the refined needs of different users and broaden the application market.

[0040] Specifically, this application discloses a 3D printer for printing a cavity structure with internal pressure, as Figure 1 and Figure 2 shown. The 3D printer includes: a printer body 100, a sealing structure 200, and a pressure control system 300. Among them, the sealing structure 200 wraps the printer body 100 and seals the printer body 100 inside the sealing structure 200; the pressure control system 300 is connected to the sealing structure 200 and changes the air pressure inside the sealing structure 200 during the printing process of the printer body 100. By sealing the printer body 100 in the sealing structure 200 and adjusting the air pressure inside the sealing structure 200 through the pressure control system 300 connected to the sealing structure 200 during the printing process of the printer body, it is ensured that the printer body 100 can adjust the air pressure of the gas sealed in the cavity structure as needed when printing the cavity structure, thereby manufacturing a cavity structure with internal pressure, providing better resilience performance and buffering effect for the product. Optionally, the 3D printer adjusts the inside of the sealing structure 200 to an air pressure environment greater than one standard atmospheric pressure by 0.01 MPa - 0.5 MPa, that is, an air pressure environment of 0.111 MPa - 0.601 MPa through the pressure control system 300 during the printing process, so as to ensure that the gas with corresponding pressure is sealed in the printed cavity structure, providing better resilience performance and buffering effect for the product.

[0041] Further, the printer body is one of a material jetting printer, a material extrusion printer, a binder jetting printer, and a stereolithography printer. Optionally, the printer body may be a fused deposition modeling printer (FDM / FFF printer), a direct ink writing printer (DIW printer), a stereolithography printer (SLA printer), a digital light processing printer (DLP printer), a liquid crystal display stereolithography printer (LCD / MSLA printer), a selective laser sintering printer (SLS printer), a selective laser melting printer (SLM printer), or an electron beam melting printer (EBM printer). The above types of 3D printers are only some of the available 3D printer types. As long as the corresponding body can withstand the pressure environment, all other types of 3D printers can be applied to the printer body of the 3D printer described in this application and will not be listed here. Optionally, as Figure 1 shown, the printer body 100 includes a base 110 and a print head 120. The print head 120 moves relative to the base 110 and outputs printing material to manufacture a required structural product on the base 110.

[0042] Further, as Figure 1 shown, the sealing structure 200 includes a housing 210, a pressurizing port 220, a pressure relief port 230, and a material port 240. Among them, the housing 210 wraps the printer body 100 and seals the printer body 100 inside the housing 210. The pressurizing port 220 and the pressure relief port 230 are provided on the side wall of the housing 210 and penetrate through the housing 210 to form a communication channel between the inside and the outside of the housing 210. The material port 240 is provided on the housing 210 and corresponds to the printer body 100 to supply material to the printer body 100 before starting printing or take the printed product from the printer body 100 after printing. Optionally, the material port 240 is an outward-opening sealed door, and a sealing strip is provided between the material port 240 and the housing 210 to ensure the sealing effect of the housing 210 on the printer body 100 after closing the material port 240. By wrapping and sealing the printer body 100 with the sealing structure 200 and cooperating with the pressure control system 300, the air pressure environment inside the sealing structure 200 can be adjusted during the printing process of the printer body 100, and the gas with the required pressure is wrapped into the printed cavity structure, so that the inside of the printed closed cavity structure has pressure, and the cavity structure with internal pressure is obtained, and the cavity structure has better resilience and buffering performance, thereby expanding the application scenarios of the cavity structure.

[0043] Further, as Figure 1As shown, the pressure control system 300 includes a pressurizing device 310, a pressure relief device 320, a pressure sensor 330, and a controller 340. Among them, the pressurizing device 310 is communicated with the inside of the sealing structure 200 through the pressurizing port 220 to input pressurized gas into the sealing structure 200 during the printing process of the printer body 100, so that the air pressure inside the sealing structure 200 is greater than the external air pressure. The pressure relief device 320 is communicated with the inside of the sealing structure 200 through the pressure relief port 230 to discharge the pressurized gas inside the sealing structure 200 after printing is completed or when the device has a problem resulting in a sudden increase in pressure, thereby adjusting the air pressure inside the sealing structure 200 to be the same as the external air pressure and ensuring the safety production process. The pressure sensor 330 is fixed inside the housing 210 of the sealing structure 200 to monitor the air pressure inside the sealing structure 200 and achieve precise monitoring of the air pressure data inside the sealing structure 200. Optionally, a plurality of pressure sensors 330 are arranged at different positions inside the housing 210 of the sealing structure 200 to monitor the pressures at different positions inside the sealing structure 200. Thus, when printing a multi-cavity structure containing multiple cavity structures, the pressure can be independently regulated for the sealing positions of the cavity structures according to the printing sequence, so that different cavity structures have different internal pressures according to different functional requirements, providing users with personalized customization services and expanding the application scenarios of the product. Further, the controller 340 is respectively communicatively connected to the pressurizing device 310, the pressure relief device 320, and the pressure sensor 330 to control the operation of the pressurizing device 310 and the pressure relief device 320 according to the air pressure data monitored by the pressure sensor 330, and achieve precise regulation of the pressure inside the cavity structure.

[0044] Further, as Figure 1 shown, the pressurizing device 310 includes a gas tank 311 and an air pump 312. Among them, the gas tank 311 stores pressurized gas to provide the required pressurized gas for the sealing structure 200. Optionally, the pressurizing device 310 includes a plurality of gas tanks 311, and different pressurized gases are stored in the gas tanks 311 to switch the type of gas input into the sealing structure according to needs. Specifically, pressurized gases such as compressed air, compressed nitrogen, and compressed argon are respectively stored in the gas tank 311 to input the corresponding gas into the sealing structure 200 during the printing process according to needs. Optionally, compressed air, compressed nitrogen, and compressed argon with different pressures are stored in different gas tanks 311 to achieve rapid and precise adjustment of the air pressure inside the sealing structure 200.

[0045] Further, as Figure 1As shown, one end of the air pump 312 is connected to the air tank 311, and the other end is connected to the inside of the sealing structure 200 through the pressurizing port 220 to input the pressurized gas in the air tank 311 into the sealing structure 200, thereby changing the air pressure in the sealing structure 200. Specifically, each air tank 311 is connected to the air pump 312 through a multi-air path structure, so that the air pump 312 can quickly switch between different air tanks 311, and input the specific gas with a specific pressure in the corresponding air tank 311 into the sealing structure 200 as needed, realizing the rapid and precise control of the internal air pressure of the sealing structure 200, so as to ensure that the sealed cavity structure during printing has the required internal pressure and gas type, and obtain a specific cavity structure with internal pressure.

[0046] Further, as Figure 1 shown, the air pump 312 includes a main variable-frequency air pump 3121 and an emergency air pump 3122 connected in series to achieve precision control of the air pressure environment in the sealing structure 200 with an accuracy of ±0.01 MPa. Specifically, the rapid adjustment of the air pressure environment in the sealing structure 200 is realized through the main variable-frequency air pump 3121, and then the precise adjustment of the air pressure environment in the sealing structure 200 is realized by using the emergency air pump 3122, achieving precision control of the air pressure environment in the sealing structure 200 with an accuracy of ±0.01 MPa. Optionally, the emergency air pump 3122 is a micro emergency air pump to reduce the overall volume of the device and facilitate transportation and installation.

[0047] Further, as Figure 1As shown, the pressure relief device 320 includes an active valve 321, a passive valve 322, a safety valve 323, and a silencing and condensing tower 324. Among them, the active valve 321 is arranged outside the housing 210 and connected to the pressure relief port 230. During the printing process of the printer body 100, the active valve 321 closes and seals the pressure relief port 230 to ensure that the air pressure in the sealing structure 200 remains stable; after the printing of the printer body 100 is completed, the active valve 321 opens to conduct the pressure relief port 230, so as to discharge the gas in the sealing structure 200 and adjust the air pressure in the sealing structure 200 to be the same as the external air pressure. Optionally, the active valve 321 is an electric pressure relief valve, and the active valve 321 is communicatively connected to the controller 340. When preparing to start printing and inputting pressurized gas into the sealing structure 200, the controller 340 controls the active valve 321 to close and seal the pressure relief port 230 to ensure that the air pressure in the sealing structure 200 is maintained at the required value; after the printing is completed, the controller 340 controls the active valve 321 to conduct, and discharges the pressurized gas in the sealing structure 200, which is convenient for taking the printed product. Through the active valve 321, the sealing and pressure relief response can be achieved within 0.1 second, so as to quickly seal or open the sealing structure 200, ensure the internal pressure of the finally printed cavity structure, and at the same time ensure the safety and reliability of the production and manufacturing process.

[0048] Further, the passive valve 322 is connected to the active valve 321 to open the active valve 321 when the air pressure in the sealing structure 200 is greater than the first threshold, and discharge the gas in the sealing structure 200. Optionally, the passive valve 322 is a mechanical spring safety valve, and the passive valve 322 is arranged between the active valve 321 and the housing 210. One end of the passive valve 322 is arranged inside the housing 210, and the other end of the passive valve 322 passes through the pressure relief port 230 and abuts against the active valve 321. When the air pressure in the sealing structure 200 is greater than the first threshold, the passive valve 322 is forced to bounce up and push open the active valve 321 to ensure the safety production process. Optionally, the first threshold is 0.601 MPa. During the printing process, when the gas pressure in the sealing structure 200 is greater than 0.601 MPa, the passive valve 322 automatically bounces up and pushes open the active valve 321, so that the pressure relief port 230 is conducted, and the pressurized gas in the sealing structure 200 is discharged, avoiding excessive pressure in the sealing structure 200 caused by user negligence or mistakes, thereby improving the safety of the printing process.

[0049] Furthermore, the safety valve 323 is fixed at the material port 240 to open the material port 240 when the air pressure within the sealing structure 200 is greater than the second threshold, discharging the gas within the sealing structure 200, such that the gas pressure within the sealing structure 200 quickly returns to being equal to the external pressure (1 atm). Optionally, the safety valve 323 is a rupturable diaphragm, and the safety valve 323 is disposed on the sealing strip between the material port 240 and the housing 210. When the gas pressure within the sealing structure 200 is greater than the second threshold, the safety valve 323 automatically ruptures to open the material port 240, releasing the pressurized gas within the sealing structure 200, achieving ultimate overpressure protection for the 3D printer. Among them, the second threshold is higher than the first threshold. Optionally, the second threshold is 0.7 MPa to relieve pressure when a malfunction or other problem occurs in the pressurizing device 310, causing the gas pressure within the sealing structure 200 to suddenly increase and exceed the second threshold, improving the safety of the printing process.

[0050] Furthermore, the silencing and condensing tower 324 is disposed outside the housing 210 and connected to the gas outlet of the active valve 321 to cool down and reduce the noise of the gas within the sealing structure 200 before discharging it, avoiding impact on the environment and achieving an environmentally friendly production and manufacturing process.

[0051] This application provides a sealing structure 200 that encloses the printer body 100, and a pressure control system 300 connected to the sealing structure 200. It solves the problem of the cavity structure with pressure inside 3D printing through a simple structure, expanding the application scenarios of 3D printing products. Specifically, this application realizes the dynamic adjustment of the air pressure inside the sealing structure through the pressure control system. Especially for the printing process of multi-cavity structures, it can independently regulate the gas pressure inside the sealing structure according to the printing sequence and sealing positions of different cavity structures, so as to ensure that the corresponding cavity structure contains the required type and pressure of gas when forming and sealing, thereby providing different rebound and buffering performances for different functional areas and achieving better rebound and buffering effects. Further, this application sets up a redundant configuration of double air pumps, and regulates the gas pressure inside the sealing structure in real-time through the feedback of pressure sensors, so as to achieve an accuracy control of the gas pressure within ±0.01 MPa, improving the control of the internal pressure of the cavity structure. In addition, this application uses a multi-airway design to connect the gas tank and the air pump, so that it can quickly switch media such as compressed air, compressed nitrogen, and compressed helium, and can also quickly switch gas media with different pressures, thereby shortening the time to adjust the air pressure inside the sealing structure, increasing the accuracy and speed of air pressure regulation, and can also automatically inject inert gas when printing materials to prevent the internal structure from oxidizing during use and extend the service life. Finally, this application is provided with multi-stage pressure relief channels, forming a multi-stage pressure relief mechanism for the sealing structure through an active valve (response time < 0.1 second), a passive valve (pure physical trigger), and a safety valve (ultimate overpressure protection), thus ensuring the safety of the production and manufacturing process. At the same time, by setting in the silencing and condensing tower, it ensures that the high-pressure gas inside the sealing structure can be cooled, noise-reduced, and safely discharged after printing, realizing an environmentally friendly production and manufacturing process. Therefore, this application ensures that the 3D printer can adjust the gas pressure sealed inside the cavity structure as needed when printing the cavity structure, so as to manufacture a cavity structure with pressure inside, providing better rebound and buffering effects for the product.

[0052] Further, the method for using the 3D printer for printing a cavity structure with internal pressure of this application includes the steps:

[0053] S100. Place the printer body into the sealing structure and input the materials required for printing into the printer body;

[0054] S200. Close and seal the material port and the pressure relief port, and seal the printer body in the sealing structure;

[0055] S300. Input the required pressure gas into the sealing structure;

[0056] After it is determined that the internal air pressure of the sealing structure reaches the required air pressure, the printer body starts to print the cavity structure to obtain a cavity structure with internal pressure.

[0057] S500. After the cavity structure is formed and sealed, stop printing and open the pressure relief port, and discharge the pressurized gas in the sealing structure through the active valve.

[0058] S600. Wait until the pressure in the sealing structure is equal to the external air pressure, open the sealing structure and take out the cavity structure with internal pressure.

[0059] Through the above method, combined with the 3D printer for printing a cavity structure with internal pressure described in this application, a cavity structure with specific pressurized air sealed inside can be obtained, so as to ensure that the cavity structure has better resilience performance and buffering performance, enabling the printed product with this structure to be applied in fields such as sports equipment and buffer function devices, expanding the application scenarios of the product.

[0060] In summary, this application discloses a 3D printer for printing a cavity structure with internal pressure, including: a printer body; a sealing structure that wraps the printer body and seals the printer body inside the sealing structure; and a pressure control system that communicates with the sealing structure and changes the air pressure inside the sealing structure during the printing process of the printer body. By sealing the 3D printer in the sealing structure and then adjusting the air pressure inside the sealing structure through the pressure control system communicating with the sealing structure during the printing process of the 3D printer, it is ensured that the 3D printer can adjust the gas pressure sealed inside the cavity structure as needed when printing the cavity structure, thereby manufacturing a cavity structure with internal pressure and providing better resilience performance and buffering effect for the product.

[0061] It should be understood that the application of this application is not limited to the above examples. For those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of this application.

Claims

1. A 3D printer for printing a cavity structure with internal pressure, characterized in that, Comprising: A printer body; A sealing structure that wraps the printer body and seals the printer body within the sealing structure; A pressure control system that communicates with the sealing structure and changes the air pressure within the sealing structure during the printing process of the printer body.

2. The 3D printer for printing a cavity structure with internal pressure according to claim 1, wherein The printer body is one of a material jetting printer, a material extrusion printer, a binder jetting printer, and a stereolithography printer.

3. The 3D printer for printing a cavity structure with internal pressure according to claim 2, characterized in that, The sealing structure includes: A housing that wraps the printer body; A pressurizing port and a pressure relief port that are provided on the side wall of the housing and penetrate through the housing; A material port that is provided on the housing and corresponds to the printer body to supply materials to the printer body or take printing products from the printer body.

4. The 3D printer for printing a cavity structure with internal pressure according to claim 3, wherein, The pressure control system includes: A pressurizing device that communicates with the interior of the sealing structure through the pressurizing port to make the air pressure within the sealing structure greater than the external air pressure during the printing process of the printer body; A pressure relief device that communicates with the interior of the sealing structure through the pressure relief port to adjust the air pressure within the sealing structure to be the same as the external air pressure; A pressure sensor that is fixed inside the housing of the sealing structure to monitor the air pressure within the sealing structure; A controller that is respectively communicatively connected to the pressurizing device, the pressure relief device, and the pressure sensor to control the operation of the pressurizing device and the pressure relief device according to the air pressure data monitored by the pressure sensor.

5. The 3D printer for printing a cavity structure with internal pressure according to claim 4, characterized in that, The pressurizing device includes: An air tank that stores pressurized gas; An air pump, one end of which is connected to the air tank and the other end of which communicates with the interior of the sealing structure through the pressurizing port to input the pressurized gas in the air tank into the sealing structure and change the air pressure within the sealing structure.

6. The 3D printer for printing a cavity structure with internal pressure according to claim 5, characterized in that, The pressurizing device includes a plurality of air tanks that store different pressurized gases to switch the type of gas input into the sealing structure as needed.

7. The 3D printer for printing a cavity structure with internal pressure according to claim 5, characterized in that, The air pump includes a main variable frequency air pump and an emergency air pump connected in series to achieve precision control of the air pressure environment within the sealing structure with an accuracy of ±0.01 MPa.

8. The 3D printer for printing a cavity structure with internal pressure according to claim 4, characterized in that, The pressure relief device includes: An active valve that is provided outside the housing and is connected to the pressure relief port to discharge the gas within the sealing structure after the printing of the printer body is completed and adjust the air pressure within the sealing structure to be the same as the external air pressure; A passive valve that is connected to the active valve to open the active valve when the air pressure within the sealing structure is greater than a first threshold and discharge the gas within the sealing structure.

9. The 3D printer for printing a cavity structure with internal pressure according to claim 8, characterized in that, The pressure relief device further includes: A safety valve that is fixed at the material port to open the material port when the air pressure within the sealing structure is greater than a second threshold and discharge the gas within the sealing structure.

10. The 3D printer for printing a cavity structure with internal pressure according to claim 8, characterized in that, The pressure relief device further includes: A silencing condensing tower, the silencing condensing tower is arranged outside the shell and connected to the active valve to discharge the gas in the sealing structure after cooling and noise reduction.

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