Atmosphere system and 3D printer

Abstract

The invention relates to the technical field of 3D printing, in particular to an atmosphere system and a 3D printer. The atmosphere system comprises a refrigeration unit, and a dust filtering unit and a condensation pipe body which are sequentially arranged on a filtering air path. Wherein the refrigeration unit is used for reducing the temperature of fluid in the condensation pipe body; an inlet and an outlet of the filtering gas path are both communicated with a forming chamber of the 3D printer; during filtering, inert gas enters the filtering gas path and then sequentially passes through the dust filtering unit and the condensation pipe body. In the printing process of the 3D printer, inert gas in the forming chamber sequentially passes through the dust filtering unit and the condensation pipe body through the filtering gas path and then returns to the forming chamber, and dust in the inert gas is filtered out through the dust filtering unit. Due to the fact that the refrigerating unit refrigerates the inert gas flowing in the condensing pipe body, water vapor carried in the inert gas can form condensed water when passing through the condensing pipe body, the water vapor in the inert gas is separated out, and the effect of drying the inert gas is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to an atmosphere system and a 3D printer. Background Art

[0002] Metal 3D printing technology uses metal powder as raw material, and uses the high temperature of the laser beam to sinter the metal powder located in a specific area of ​​the molding chamber to produce products with specific structures. This process must be carried out in an atmosphere filled with inert gas to prevent the metal powder at high temperature from reacting with the active gas to ensure safe operation. During the sintering process of metal powder, smoke will be generated, and metal dust will fly when the powder is spread. These smoke and dust will mix in the atmosphere. These smoke and dust will not only interfere with the propagation of the laser beam, but also reduce the accuracy and quality of the printed parts.

[0003] Currently, during the printing process, in order to purify the dust in the inert gas in the molding room, the inert gas is usually pumped into a filter for filtration, and the inert gas is then sent into the molding room for recycling after filtration.

[0004] Although the existing filters can filter out the dust in the inert gas, there are also some problems during use: first, since the prints need to be taken out of the molding chamber after each printing is completed, in the process of taking out the prints, the air containing water vapor from the outside will enter the molding chamber, and the water droplets formed by the water vapor will adhere to the inside of the equipment. In the inert gas filtration cycle, the moisture cannot be discharged to the outside. The heat inside the equipment will cause the water droplets to evaporate and form water vapor mixed in the inert gas, which greatly affects the atmosphere in the molding chamber; secondly, since the smoke contains dust particles of different sizes, using a single filter to filter the dust, large particles of dust will quickly cover the filter element of the filter, thereby reducing the filtering effect. Summary of the invention

[0005] In view of the above-mentioned defects, the technical problem to be solved by the present invention is to provide an atmosphere system and a 3D printer, wherein the atmosphere system can provide a dry inert gas environment atmosphere for the 3D printer to avoid the presence of water vapor in the environment atmosphere of the 3D printer.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] In a first aspect, an atmosphere system is provided, comprising a refrigeration unit, a dust filter unit and a condensation tube body sequentially arranged on a filter gas path;

[0008] The refrigeration unit is used to reduce the temperature of the fluid in the condenser tube body;

[0009] The dust filtering unit is used to filter dust in the gas;

[0010] The inlet and outlet of the filter air path are both communicated with the molding chamber of the 3D printer.

[0011] By adopting the above scheme, when the 3D printer is printing, the inert gas in the molding chamber passes through the dust filter unit and the condenser tube body in turn through the filter gas path and returns to the molding chamber, and the dust in the inert gas is filtered out by the dust filter unit. Since the refrigeration unit cools the inert gas flowing in the condenser tube body, the water vapor carried by the inert gas will form condensed water when passing through the condenser tube body, thereby separating the water vapor in the inert gas and achieving the effect of drying the inert gas. On the other hand, during the printing process of the 3D printer, the temperature in the molding chamber is high because the 3D printing laser generates a lot of heat during the printing process. The high temperature environment will cause the equipment to run unstably. The refrigeration unit cools the inert gas in the condenser tube body, and the condenser tube body cools the inert gas passing through it, which can also play a role in regulating and stabilizing the temperature in the molding chamber.

[0012] Preferably, the condenser tube body comprises an inner shell and an outer shell connected to each other, a heat exchange chamber is enclosed between the inner shell and the outer shell, a medium inlet and a medium outlet connected to the heat exchange chamber are provided on the outer shell, a drainage channel is provided at the bottom of the outer shell, a drainage port connected to the drainage channel is provided at the bottom of the inner shell, and the refrigeration unit is configured to inject cooling medium into the heat exchange chamber through the medium inlet, and reflux through the medium outlet to form a cycle. The refrigeration unit injects cooling medium into the heat exchange chamber through the medium inlet, and the cooling medium flows out through the medium outlet and returns to the refrigeration unit. The heat of the inert gas passing through the inner side of the inner shell is transferred to the cooling medium through the inner shell, so that the water vapor carried in the inert gas condenses to form condensed water, and the temperature of the inert gas is reduced. The condensed water can be discharged through the drainage channel and the drainage port, and the drainage port is connected to the drainage channel so that the drainage path is separated from the heat exchange chamber and does not interfere with the cooling medium.

[0013] Preferably, a partition is provided in the heat exchange chamber, and the partition divides the space in the heat exchange chamber to form a tortuous or spiral medium channel. Since the medium channel is tortuous or spiral, the flow path of the cooling medium in the heat exchange chamber is also tortuous or spiral, thereby enhancing the cooling effect on the inner shell.

[0014] Preferably, the drainage channel is connected to a water tank through a pipeline. Condensed water inside the inner shell can be discharged into the water tank through the pipeline, which is convenient for collecting condensed water and can also prevent a part of the inert gas from being discharged into the air through the drainage channel during the filtering process of the inert gas, thereby avoiding wasting the inert gas.

[0015] Preferably, the dust filter unit comprises a cylinder, a back-blowing assembly and a plurality of filter elements, wherein a first chamber and a second chamber are provided inside the cylinder, and an air inlet connected to the first chamber and an air outlet connected to the second chamber are provided on the cylinder; the filter element is arranged in the first chamber, one end of the filter element extends into the second chamber, the filter element is a hollow structure, and at least one air vent is provided at one end of the filter element located in the second chamber; the back-blowing assembly is arranged in the second chamber, and the back-blowing assembly is used to spray gas into the air vent. When in use, the gas containing dust is input into the first chamber through the air inlet, the gas filtered by the filter element in the first chamber enters the second chamber through the air vent, and the gas in the second chamber is output through the air outlet. When the filter element needs to be cleaned, a high-pressure airflow is sprayed into the air vent through the back-blowing assembly, and after the high-pressure airflow enters the hollow filter element, the dust accumulated on the outer surface of the filter element is flushed out, so that the filter element can be cleaned without disassembling the filter element, thereby improving work efficiency.

[0016] Preferably, the backflush assembly includes an air supply unit and a plurality of jet heads corresponding to the filter element one by one, the air supply unit is used to provide compressed gas, the air inlet end of the jet head is connected to the air supply end of the air supply unit through a pipeline, the jet port of the jet head corresponds to the air vent, and a first control valve is provided on the pipeline. When the filter element needs to be cleaned, the first control valve is opened, the air supply unit supplies air to the jet head through the pipeline, and the compressed gas provided by the air supply unit can form a greater impact on the inside of the filter element, so that the dust attached to the outside of the filter element is easier to fall off, and the cleaning effect is better.

[0017] Preferably, the bottom of the cylinder is connected to a slag discharge pipe, the slag discharge pipe is connected to the first chamber, and a second control valve is provided on the slag discharge pipe. When cleaning the filter element, the second control valve is opened, through which the dust in the second chamber can be discharged on the one hand, and the pressure can be relieved on the other hand to prevent the internal pressure of the cylinder from being too high.

[0018] Preferably, a cyclone separator is further included on the filter gas path, and the cyclone separator is arranged between the inlet end of the filter gas path and the dust filter unit. The large dust particles carried in the inert gas can be separated by the cyclone separator, and the small dust particles enter the dust filter unit for filtration, thereby preventing the large dust particles from quickly covering the filter element of the dust filter unit, thereby achieving a graded filtration effect.

[0019] Preferably, it further includes an exhaust pipe, a third control valve and an exhaust filter unit, wherein the exhaust pipe is connected to the filter gas path, the third control valve is arranged on the exhaust pipe, and the outlet of the exhaust pipe is connected to the inlet of the exhaust filter unit. Before the atmosphere system filters the inert gas, the inert gas is introduced into the molding chamber and the atmosphere system of the 3D printer to replace the air therein, and then the inert gas is transported to the exhaust filter unit through the exhaust pipe for filtration, and then discharged into the atmosphere to prevent pollution.

[0020] In a second aspect, a 3D printer is provided, comprising the above-mentioned atmosphere system.

[0021] In summary, the atmosphere system provided by the present invention has at least the following beneficial effects:

[0022] 1. It can filter dust and water vapor in the inert gas and provide a more suitable atmosphere for the 3D printer.

[0023] 2. Gradual filtration of large and small particles can extend the cleaning cycle of the filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without expending any novel work.

[0025] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention (wherein arrows are used to indicate the flow direction of the inert gas when filtering the inert gas);

[0026] Figure 2 1 is a left side view of the present invention (wherein arrows are used to indicate the flow direction of the inert gas when filtering the inert gas);

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the dust filtering unit in the present invention;

[0028] Figure 4 is an exploded schematic diagram of the dust filtration unit in the present invention;

[0029] Figure 5 It is a three-dimensional structural schematic diagram of the filter element, bracket, horizontal plate and jet head in the present invention;

[0030] Figure 6 It is a schematic diagram of the assembly of the filter element, bracket, cross plate and jet head in the present invention;

[0031] Figure 7It is a front view of the dust filter unit of the present invention;

[0032] Figure 8 yes Figure 7 A cross-sectional view at AA in the middle (wherein arrows are used to indicate the flow direction of the inert gas when filtering the inert gas);

[0033] Fig. 9 is a side view of the condenser tube body of the present invention;

[0034] Fig.10 yes Fig. 9 Cross-sectional view at the middle BB.

[0035] The symbols of the accompanying drawings include: refrigeration unit 1, dust filtering unit 2, cylinder 201, cylinder body 2011, cover 2012, handle 2013, backflush assembly 202, air supply unit 2021, jet head 2022, pipeline 2023, jet port 2024, first control valve 2025, filter element 203, first chamber 204, second chamber 205, air inlet 206, air outlet 207, air vent 208, air inlet pipe 209, fourth control valve 210, air outlet pipe 211, fifth control valve 212, slag discharge pipe 213, second control valve 211, filter bag 215, cross plate 2 16, bracket 217, condenser tube body 3, inner shell 301, outer shell 302, heat exchange chamber 303, medium inlet 304, medium outlet 305, drainage channel 306, drainage port 307, partition 308, notch 309, pipeline 4, water storage tank 5, cyclone separator 6, exhaust pipe 7, third control valve 8, exhaust gas filter unit 9, gas delivery unit 10, first pressure pipe 11, first pressure sensor 12, second pressure pipe 13, second pressure sensor 14, powder collection bottle 15, input pipe 16, sixth control valve 17, output pipe 18, seventh control valve 19, vacuum butterfly valve 20. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, Figure 1-10 The present invention is further described in detail with specific implementation modes.

[0037] See also Figure 1-10, an atmosphere system provided in this embodiment includes a refrigeration unit 1 and a dust filter unit 2 and a condenser tube body 3 which are sequentially arranged on the filter gas path. Among them, the refrigeration unit 1 is configured to be able to refrigerate the condenser tube body 3; the dust filter unit 2 is used to filter dust in the gas; the inlet and outlet of the filter gas path are both connected to the molding chamber of the 3D printer; during filtering, after the inert gas enters the filter gas path, it passes through the dust filter unit 2 and the condenser tube body 3 in sequence. In order to promote the flow of the inert gas, a gas delivery unit 10 is also provided on the filter gas path. The gas delivery unit 10 can specifically adopt a fan in the prior art, and the fan can drive the gas in the filter gas path to flow in one direction. The fan is specifically arranged on the filter gas path between the dust filter unit 2 and the condenser tube body 3. The outlet of the condenser tube body 3 is connected to the molding chamber of the 3D printer through the output pipe 18, and the output pipe 18 is provided with a seventh control valve 19.

[0038] By adopting the above scheme, during the printing process of the 3D printer, the inert gas in the molding chamber of the 3D printer passes through the dust filter unit 2 and the condenser tube body 3 in turn through the filter gas path and returns to the molding chamber, and the dust in the inert gas is filtered out by the dust filter unit 2. Since the refrigeration unit 1 cools the flowing inert gas in the condenser tube body 3, the water vapor carried in the inert gas will form condensed water when passing through the condenser tube body 3, thereby separating the water vapor in the inert gas and achieving the effect of drying the inert gas. On the other hand, during the printing process of the 3D printer, since the laser of the 3D printer generates a lot of heat during the printing process, the temperature in the molding chamber is high, and the high temperature environment will cause the equipment to run unstably. The refrigeration unit 1 cools the inert gas flowing in the condenser tube body 3, and the condenser tube body 3 cools the inert gas passing through it, thereby also being able to play a role in regulating and stabilizing the temperature in the molding chamber.

[0039] In some embodiments, specifically, the condenser tube body 3 includes an inner shell 301 and an outer shell 302 connected to each other, and a heat exchange chamber 303 is enclosed between the inner shell 301 and the outer shell 302. The inner shell 301 and the outer shell 302 are both in the shape of a circular tube, the inner shell 301 is arranged inside the outer shell 302, the inner shell 301 and the outer shell 302 are arranged concentrically, and the heat exchange chamber 303 surrounds the outer circumference of the inner shell 301. The top of the outer shell 302 is provided with a medium inlet 304 and a medium outlet 305 connected to the heat exchange chamber 303, and the medium inlet 304 and the medium outlet 305 are respectively arranged near the two ends of the outer shell 302. The bottom of the outer shell 302 is provided with a drainage channel 306, the drainage channel 306 is arranged in the body of the outer shell 302, and the drainage channel 306 is separated from the heat exchange chamber 303. The inner shell 301 is in the shape of a corrugated tube, and the bottom of the inner shell 301 is provided with a drainage port 307 connected to the drainage channel 306. Specifically, a drain port 307 is provided at the lowest point of each corrugation of the corrugated tube-shaped inner shell 301, and the lower end of the drain port 307 extends downward and is connected to the drain channel 306. The refrigeration unit 1 is configured to be able to inject cooling medium into the heat exchange chamber 303 through the medium inlet 304, and reflux through the medium outlet 305 to form a cycle. The refrigeration unit 1 is a prior art, and the refrigeration unit 1 specifically includes a refrigerator and a circulating water pump. The cooling medium is refrigerated by the refrigerator, and the refrigerated cooling medium is injected into the medium inlet through the circulating water pump, and refluxes to the refrigerator through the medium outlet 305 for refrigeration, forming a cycle.

[0040] In order to improve the refrigeration effect, preferably, a partition 308 is provided in the heat exchange chamber 303, and the partition 308 divides the space in the heat exchange chamber 303 to form a zigzag or spiral medium channel. In this embodiment, it is preferred to divide the heat exchange chamber 303 by multiple partitions 308 to form a zigzag medium channel. Specifically, the partition 308 is annular, and its outer ring side is connected to the inner side of the outer shell 302, and its inner ring side is connected to the outer wall of the inner shell 301. Multiple partitions 308 are evenly distributed along the longitudinal direction of the inner shell 301. The lower side of the first partition 308 located at the left end is provided with a notch 309 for the cooling medium to pass through, the notch 309 of the second partition 308 is arranged on the upper side, and the notch 309 of the third partition 308 is arranged on the lower side. By staggering the notches 309 of the partitions 308 up and down, the heat exchange chamber 303 is divided to form a zigzag medium channel. The lower end of the drainage channel 306 is connected to a water storage tank 5 through a pipeline 4 , and the height of the water storage tank 5 is lower than the height of the condensation tube body 3 .

[0041] In some embodiments, the dust filter unit 2 includes a barrel 201, a backflush assembly 202, and a plurality of filter cartridges 203. The barrel 201 is provided with a first chamber 204 and a second chamber 205, and the barrel 201 is provided with an air inlet 206 communicating with the first chamber 204, and an air outlet 207 communicating with the second chamber 205. Specifically, the barrel 201 includes a barrel body 2011 and a cover 2012, the barrel body 2011 has an opening at the upper end, the upper end opening of the barrel body 2011 is closed by the cover 2012, and the cover 2012 is connected to the barrel body 2011 by bolts. In order to facilitate the opening of the cover 2012, two handles 2013 are fixedly connected to the upper side of the cover 2012. The interior of the cylinder 201 is divided into a first chamber 204 and a second chamber 205 by a transverse plate 216. The first chamber 204 is located below the second chamber 205. The transverse plate 216 is provided with a plurality of mounting holes corresponding to the filter element 203, and the filter element 203 is inserted into the corresponding mounting holes. The filter element 203 can be removed from the mounting hole when it needs to be disassembled. A bracket 217 is provided on the upper side of the transverse plate 216, and the nozzle 2022 is fixedly connected to the bracket 217. The air inlet 206 is opened at the front side of the cylinder body 2011, and the air inlet 206 is connected to the first chamber 204. The air inlet 206 is connected to the air inlet pipe 209, and the air inlet pipe 209 is provided with a fourth control valve 210. The air outlet 207 is opened in the middle of the cover 2012, and the air outlet 207 is connected to the air outlet pipe 211, and the air outlet pipe 211 is provided with a fifth control valve 212. The air inlet pipe 209 serves as the input end of the gas to be purified, and the air outlet pipe 211 serves as the output end of the purified gas. The filter element 203 is arranged in the first chamber 204, and a plurality of filter elements 203 are evenly distributed along the left-right direction, and there is a gap between adjacent filter elements 203. The upper end of the filter element 203 extends into the second chamber 205, and the filter element 203 is a hollow structure. At least one vent 208 is provided at one end of the filter element 203 located in the second chamber 205. In this embodiment, preferably, the filter element 203 is plate-shaped, and at least two vents 208 are provided at one end of the filter element 203 located in the second chamber 205. The vents 208 are distributed along the width direction of the filter element 203, and the jet ports 2024 of the jet head 2022 are arranged one by one with the vents 208. In this embodiment, preferably, the filter element 203 adopts the existing sintered filter element 203. The backflush assembly 202 is disposed in the second chamber 205 , and is used to inject gas into the vent 208 .

[0042] By adopting the above scheme, when filtering the gas containing dust, the gas to be filtered is input into the first chamber 204 through the air inlet 206, and the gas in the first chamber 204 enters the second chamber 205 after being filtered by the filter element 203, and the gas entering the second chamber 205 is output as purified gas through the air outlet 207. When it is necessary to clean the dust attached to the filter element 203, the high-pressure airflow is sprayed into the vent 208 through the backflush assembly 202, and after the high-pressure airflow enters the hollow filter element 203, the dust accumulated on the outer surface of the filter element 203 is flushed out, so that the filter element 203 can be cleaned without disassembling the filter element 203, thereby improving the work efficiency.

[0043] The back-blowing assembly 202 includes an air supply unit 2021 and a plurality of jet heads 2022 corresponding to the filter element 203, wherein the air supply unit 2021 is used to provide compressed gas, and the air supply unit 2021 is arranged outside the cylinder 201; the air inlet end of the jet head 2022 is connected to the air supply end of the air supply unit 2021 through a pipeline 2023, and the jet port 2024 of the jet head 2022 corresponds to the vent 208, and the jet head 2022 is located above the filter element 203, and the jet port 2024 is arranged downward. A first control valve 2025 is arranged on the pipeline 2023, and the first control valve 2025 is a pulse electromagnetic valve. The pulse electromagnetic valve can make the airflow ejected from the jet head 2022 a pulse airflow. The pulse airflow forms a vibration-like impact on the filter element 203, thereby improving the cleaning effect of the filter element 203. In some embodiments, the air supply unit 2021 includes an air tank and an air compressor, and compressed air is input into the air tank through the air compressor. The pipeline 2023 is connected to the air tank.

[0044] The first chamber 204 is connected to the first pressure sensor 12 through the first pressure tube 11, and the second chamber 205 is connected to the second pressure sensor 14 through the second pressure tube 13. The first pressure sensor 12 monitors the air pressure in the first chamber 204 through the first pressure tube 11, and the second pressure sensor 14 monitors the air pressure in the second chamber 205 through the second pressure tube 13. During the gas filtering process, the gas first passes through the first chamber 204, and the gas filtered by the filter element 203 in the first chamber 204 enters the second chamber 205 through the vent 208, and is output to the outside through the outlet 207 in the second chamber 205. When a lot of dust is attached to the filter element 203, the air pressure in the first chamber 204 will increase due to the obstruction of the dust. When the pressure difference between the air pressure in the first chamber 204 and the air pressure in the second chamber 205 reaches a preset value, the filter element 203 needs to be cleaned.

[0045] In order to facilitate slag discharge, as a preferred embodiment, a slag discharge pipe 213 is connected to the bottom of the cylinder 201, and the slag discharge pipe 213 is connected to the first chamber 204. The slag discharge pipe 213 is provided with a second control valve 211, and the second control valve 211 is a pressure relief valve. The bottom of the cylinder 201 is a cone with a large top and a small bottom, so that dust can gather at the slag discharge pipe 213. In order to collect the discharged dust, as a preferred embodiment, a filter bag 215 is provided at one end of the slag discharge pipe 213, and the filter bag 215 is made of a breathable material. The filter bag 215 can prevent dust from passing through, so that the dust is collected in the filter bag 215, and at the same time, it is prevented that the air pressure in the first chamber 204 and the second chamber 205 is too high when the gas is sprayed into the filter element 203. An anti-static mesh cover is also provided on the outside of the filter bag 215.

[0046] In order to prevent dust particles with larger particle sizes from directly entering the filter element 203 of the dust filter unit 2 and extend the cleaning cycle of the filter element 203, as a preferred method, a cyclone separator 6 is further included, which is arranged on the filter air path, and the cyclone separator 6 is arranged between the inlet end of the filter air path and the dust filter unit 2. The cyclone separator 6 is a prior art, and the inlet of the cyclone separator 6 is connected to an input pipe 16, and the input pipe 16 is provided with a sixth control valve 17. The cyclone separator 6 is connected to the molding chamber of the 3D printer through the input pipe 16. The lower end of the cyclone separator 6 is connected to a powder collection bottle 15, and the powder collection bottle 15 is detachably connected to the cyclone separator 6. A vacuum butterfly valve 20 is provided on the channel between the cyclone separator 6 and the powder collection bottle 15.

[0047] It also includes an exhaust pipe 7, a third control valve 8 and an exhaust filter unit 9. The exhaust pipe 7 is connected to the filter air path between the dust filter unit 2 and the condensation tube body 3. The third control valve 8 is arranged on the exhaust pipe 7. The outlet of the exhaust pipe 7 is connected to the inlet of the exhaust filter unit 9.

[0048] Working process: Before cultivating the atmosphere in the molding room of the 3D printer, inert gas is introduced into the molding room and atmosphere system of the 3D printer, and the inert gas is used to replace the internal air. The replaced gas is transported to the exhaust gas filter unit 9 through the exhaust pipe 7 for filtration, and then discharged into the atmosphere to prevent pollution.

[0049] During the 3D printing process, the inert gas in the molding chamber is input through the input pipe 16, and returns to the molding chamber along the filter gas path through the cyclone separator 6, the dust filter unit 2, the condensation tube body 3 and the output pipe 18. The dust particles with larger particle sizes are separated by the cyclone separator 6, the dust in the inert gas is filtered out by the dust filter unit 2, and the inert gas is dried by the refrigeration unit 1 and the condensation tube body 3. Since the refrigeration unit 1 cools the inert gas flowing in the condensation tube body 3, the water vapor carried by the inert gas will form condensed water when passing through the condensation tube body 3, thereby separating the water vapor in the inert gas and achieving the effect of drying the inert gas.

[0050] When a lot of dust adheres to the filter element 203, the air pressure in the first chamber 204 will increase due to the obstruction of the dust. When the air pressure difference between the first chamber 204 and the second chamber 205 reaches a preset value, the filter element 203 needs to be cleaned.

[0051] When the filter element 203 needs to be cleaned, high-pressure airflow is sprayed into the air vent 208 through the back-blowing component 202. After the high-pressure airflow enters the hollow filter element 203, the dust accumulated on the outer surface of the filter element 203 is flushed out. The filter element 203 can be cleaned of dust without disassembling the filter element 203, thereby improving work efficiency.

[0052] Based on the same inventive concept, the present invention also provides a 3D printer, including the above-mentioned atmosphere system.

[0053] It should be noted that the words indicating direction in this article, such as up and down, are all based on Figure 1 The setting of the direction is only for the convenience of description and has no other specific meaning.

[0054] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0055] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An atmosphere system, characterized in that: It comprises a refrigeration unit (1), a dust filter unit (2) and a condensation tube body (3) which are sequentially arranged on a filter gas path; The refrigeration unit (1) is used to reduce the temperature of the fluid in the condenser tube body (3); The dust filtering unit (2) is used to filter dust in the gas; The inlet and outlet of the filter air path are both communicated with the molding chamber of the 3D printer.

2. An atmosphere system according to claim 1, characterized in that: The condenser tube body (3) includes an inner shell (301) and an outer shell (302) connected to each other, a heat exchange chamber (303) is enclosed between the inner shell (301) and the outer shell (302), a medium inlet (304) and a medium outlet (305) connected to the heat exchange chamber (303) are provided on the outer shell (302), a drainage channel (306) is provided at the bottom of the outer shell (302), and a drainage port (307) connected to the drainage channel (306) is provided at the bottom of the inner shell (301), and the refrigeration unit (1) is configured to be able to inject cooling medium into the heat exchange chamber (303) through the medium inlet (304), and reflux through the medium outlet (305) to form a circulation.

3. An atmosphere system according to claim 2, characterized in that: A partition (308) is provided in the heat exchange chamber (303), and the partition (308) divides the space in the heat exchange chamber (303) to form a tortuous or spiral medium channel.

4. An atmosphere system according to claim 2, characterized in that: The drainage channel (306) is connected to a water storage tank (5) via a pipeline (4).

5. An atmosphere system according to claim 1, characterized in that: The dust filtering unit (2) comprises a barrel (201), a backflush assembly (202) and a plurality of filter elements (203); a first chamber (204) and a second chamber (205) are provided inside the barrel (201); an air inlet (206) communicating with the first chamber (204) and an air outlet (207) communicating with the second chamber (205) are provided on the barrel (201); the filter element (203) is arranged in the first chamber (204); one end of the filter element (203) extends into the second chamber (205); the filter element (203) is a hollow structure; at least one vent (208) is provided at one end of the filter element (203) located in the second chamber (205); the backflush assembly (202) is arranged in the second chamber (205); the backflush assembly (202) is used to spray gas into the vent (208).

6. An atmosphere system according to claim 5, characterized in that: The backflush assembly (202) comprises an air supply unit (2021) and a plurality of nozzles (2022) corresponding one to one with the filter element (203); the air supply unit (2021) is used to provide compressed gas; the air inlet end of the nozzle (2022) is connected to the air supply end of the air supply unit (2021) via a pipeline (2023); the jet port (2024) of the nozzle (2022) corresponds to the vent (208); and a first control valve (2025) is provided on the pipeline (2023).

7. An atmosphere system according to claim 6, characterized in that: The bottom of the cylinder (201) is connected to a slag discharge pipe (213), the slag discharge pipe (213) is connected to the first chamber (204), and a second control valve (211) is provided on the slag discharge pipe (213).

8. An atmosphere system according to any one of claims 1 to 7, characterized in that: It also comprises a cyclone separator (6) arranged on the filter air path, wherein the cyclone separator (6) is arranged between the inlet end of the filter air path and the dust filter unit (2).

9. An atmosphere system according to any one of claims 1 to 7, characterized in that: It also comprises an exhaust pipe (7), a third control valve (8) and an exhaust filter unit (9), wherein the exhaust pipe (7) is connected to the filter air path, the third control valve (8) is arranged on the exhaust pipe (7), and the outlet of the exhaust pipe (7) is connected to the inlet of the exhaust filter unit (9).

10. A 3D printer, characterized in that: Comprising the atmosphere system as described in any one of claims 1-9.

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