Atmosphere system and 3D printer

Abstract

The utility model 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 utility model relates to 3D printing technical field, concretely relates to atmosphere system and 3D printer. BACKGROUND

[0002] Metal 3D printing technology adopts metal powder as raw material, through the high temperature sintering of laser beam in the specific area of metal powder in forming chamber, to manufacture the product with specific structure. This process must be carried out in the atmosphere environment full of inert gas, to prevent the reaction of metal powder under high temperature and active gas, ensure the operation safety. In the process of metal powder sintering, the flue gas will be produced, and there will be metal dust flying in the powder laying, these dust mixes in the atmosphere environment, these dust not only will interfere with the propagation of laser beam, also will reduce the precision and quality of printing piece.

[0003] At present, in the printing process, in order to purify the dust in the inert gas in forming chamber, inert gas is usually sucked into the filter for filtering, and the inert gas is sent into the forming chamber for recycling after filtering.

[0004] Although the existing filter can filter the dust in the inert gas, but there are some problems in the use process: first, after each printing is completed, the printing piece needs to be taken out from the forming chamber, in the process of taking out the printing piece, the air containing water vapor from outside will enter the forming chamber, the water droplets formed by water vapor will adhere to the inside of the equipment, in the inert gas filtering cycle, the water cannot be discharged outward, and the heat in the equipment will make the water droplets evaporate and form water vapor mixed in the inert gas, which greatly affects the atmosphere environment in the forming chamber. Secondly, since the dust in the smoke contains dust particles of different particle sizes, a single filter is used to filter the dust, and the large particle dust will quickly cover the filter element, thereby reducing the filtering effect. UTILITY MODEL CONTENTS

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

[0006] The above technical purpose of the utility model is realized by the following technical scheme:

[0007] In a first aspect, an atmosphere system is provided, comprising a refrigeration unit, a dust filtering unit and a condenser pipe body arranged in sequence on a filtering gas path.

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

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

[0010] The inlet and outlet of the filtering gas path are both communicated with the forming chamber of the 3D printer.

[0011] By adopting the above scheme, during the printing work of the 3D printer, the inert gas in the forming chamber passes through the filtering gas path, sequentially passes through the dust filtering unit and the condensing pipe body, and then returns to the forming chamber, and the dust in the inert gas is filtered by the dust filtering unit. Due to the refrigeration of the refrigeration unit to the inert gas flowing in the condensing pipe body, the water vapor carried in the inert gas will form condensed water when passing through the condensing pipe body, so as to separate the water vapor in the inert gas, and achieve the effect of drying the inert gas. On the other hand, during the printing process of the 3D printer, the laser of the 3D printing generates a large amount of heat during the printing process, so that the temperature in the forming chamber is relatively high, and the high-temperature environment will cause the equipment to run unstably. By refrigerating the inert gas in the condensing pipe body by the refrigeration unit, the condensing pipe body cools the inert gas passing through it, thereby also playing a role in regulating and stabilizing the temperature in the forming chamber.

[0012] As a preferred, the condensing pipe body comprises an inner shell and an outer shell connected, a heat exchange chamber is enclosed between the inner shell and the outer shell, a medium inlet and a medium outlet are arranged on the outer shell and communicated with the heat exchange chamber, a drainage passage is arranged at the bottom of the outer shell, and a drainage port communicated with the drainage passage is arranged at the bottom of the inner shell. The refrigeration unit is configured to inject cooling medium into the heat exchange chamber through the medium inlet, and form circulation by backflow through the medium outlet. 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 is condensed to form condensed water, and the temperature of the inert gas is reduced. The condensed water can be discharged through the drainage passage and the drainage port, and the drainage port and the drainage passage are communicated to separate the drainage path from the heat exchange chamber and not interfere with the cooling medium.

[0013] As a preferred, a partition plate is arranged in the heat exchange chamber, and the partition plate divides the space in the heat exchange chamber to form a meandering or spiral medium channel. Since the medium channel is meandering or spiral, the flow path of the cooling medium in the heat exchange chamber is also meandering or spiral, which enhances the cooling effect of the inner shell.

[0014] As a preferred, the drainage passage is communicated with a water storage tank through a pipeline. The condensed water in the inner shell can be discharged into the water storage tank through the pipeline, which on one hand facilitates the collection of condensed water, and on the other hand can prevent a part of the inert gas from being discharged to the air through the drainage passage during the filtering of the inert gas, thereby avoiding the waste of inert gas.

[0015] As preferred, the dust filtering unit comprises a cylinder, a back flushing assembly and a plurality of filter cartridges, the cylinder is internally provided with a first chamber and a second chamber, the cylinder is provided with an air inlet communicating with the first chamber and an air outlet communicating with the second chamber; the filter cartridges are arranged in the first chamber, one end of the filter cartridges extends into the second chamber, the filter cartridges are hollow structures, at least one air vent is arranged at one end of the filter cartridges in the second chamber; the back flushing assembly is arranged in the second chamber, and is used for spraying gas into the air vent. In use, the gas containing dust is input into the first chamber through the air inlet, the filtered gas in the first chamber passes through the filter cartridges and enters the second chamber through the air vent, and the gas in the second chamber is output through the air outlet. When the filter cartridges need to be cleaned, high-pressure gas flow is sprayed into the air vent through the back flushing assembly, and the dust accumulated on the outer surface of the filter cartridges is flushed out after the high-pressure gas flow enters the hollow filter cartridges, so that the dust cleaning work of the filter cartridges can be performed without disassembling the filter cartridges, and the work efficiency is improved.

[0016] As preferred, the back flushing assembly comprises a gas supply unit and a plurality of jet heads corresponding to the filter cartridges one by one, the gas supply unit is used for providing compressed gas, the gas inlet end of the jet head communicates with the gas supply end of the gas supply unit through a pipeline, the jet outlet of the jet head corresponds to the air vent, and the pipeline is provided with a first control valve. When the filter cartridges need to be cleaned, the first control valve is opened, the gas supply unit supplies gas to the jet head through the pipeline, and the compressed gas provided by the gas supply unit can form a greater impact on the inside of the filter cartridges, so that the dust attached to the outside of the filter cartridges is more easily detached, and the cleaning effect is better.

[0017] As preferred, the bottom of the cylinder is communicated with a residue discharge pipe, the residue discharge pipe communicates with the first chamber, and the residue discharge pipe is provided with a second control valve. When the filter cartridges are cleaned, the second control valve is opened, on the one hand, the dust in the second chamber can be discharged through the second control valve, and on the other hand, the second control valve can play a role of pressure relief to prevent the pressure in the cylinder from being too high.

[0018] As preferred, a cyclone separator is further arranged on the filtering air path, and the cyclone separator is arranged between the inlet end of the filtering air path and the dust filtering unit. Through the cyclone separator, the large-particle dust carried in the inert gas can be separated out, and the small-particle dust enters the dust filtering unit for filtering, so that the large-particle dust is prevented from quickly covering the filter cartridges of the dust filtering unit, thereby achieving the effect of graded filtering.

[0019] As preferred, the atmosphere system further comprises a waste gas pipe, a third control valve and a waste gas filtering unit, the waste gas pipe is communicated with the filtering gas path, the third control valve is arranged on the waste gas pipe, and the outlet of the waste gas pipe is communicated with the inlet of the waste gas filtering unit. By introducing the inert gas into the forming chamber of the 3D printer and the atmosphere system to replace the air therein, the air is filtered by the waste gas pipe and the waste gas filtering unit before the atmosphere system filters the inert gas, and then is discharged into the atmosphere to prevent pollution.

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

[0021] In summary, the atmosphere system has at least the following advantages:

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

[0023] 2. The large particles and small particles are classified and filtered, and the cleaning cycle of the filtering device can be prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without paying novel labor.

[0025] Figure 1 is a perspective structural schematic view of the application (wherein the arrow indicates the flow direction of the inert gas when filtering the inert gas);

[0026] Figure 2 is a left view of the application (wherein the arrow indicates the flow direction of the inert gas when filtering the inert gas);

[0027] Figure 3 is a perspective structural schematic view of the dust filtering unit in the application;

[0028] Figure 4 is an exploded schematic view of the dust filtering unit in the application;

[0029] Figure 5 is a perspective structural schematic view of the filter core, the bracket, the horizontal plate and the air jet head in the application;

[0030] Figure 6 is an assembly schematic view of the filter core, the bracket, the horizontal plate and the air jet head in the application;

[0031] Figure 7 is the main view of the dust filtering unit in the utility model;

[0032] Figure 8 is Figure 7 the sectional view at A-A in the utility model (wherein the flow direction of the inert gas when filtering the inert gas is indicated by an arrow);

[0033] Figure 9 is the side view of the condensing pipe body in the utility model;

[0034] Figure 10 is Figure 9 the sectional view at B-B in the utility model.

[0035] The labels of the drawings include: refrigeration unit 1, dust filtering unit 2, barrel body 201, barrel main body 2011, cover body 2012, handle 2013, back flushing assembly 202, air supply unit 2021, air jet head 2022, pipeline 2023, air jet opening 2024, first control valve 2025, filter element 203, first cavity 204, second cavity 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, residue discharge pipe 213, second control valve 211, filter bag 215, cross plate 216, support 217, condensing pipe body 3, inner shell 301, outer shell 302, heat exchange cavity 303, medium inlet 304, medium outlet 305, drainage channel 306, drainage opening 307, partition plate 308, gap 309, pipeline 4, water storage tank 5, cyclone separator 6, waste gas pipe 7, third control valve 8, waste gas filtering unit 9, gas conveying unit 10, first pressure pipe 11, first pressure sensor 12, second pressure pipe 13, second pressure sensor 14, powder collecting 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 for those skilled in the art to better understand the technical scheme of the utility model, the utility model will be further described in detail below in combination with the drawings and specific embodiments. Figures 1-10 and specific embodiments.

[0037] Please refer to Figures 1-10The atmosphere system provided by the embodiment comprises a refrigeration unit 1 and a dust filtering unit 2 and a condensing pipe body 3 arranged in sequence on a filtering gas path. The refrigeration unit 1 is configured to be able to refrigerate the condensing pipe body 3; the dust filtering unit 2 is used to filter dust in the gas; the inlet and outlet of the filtering gas path are in communication with the forming chamber of the 3D printer; when filtering, the inert gas enters the filtering gas path and passes through the dust filtering unit 2 and the condensing pipe body 3 in sequence. In order to promote the flow of the inert gas, a gas conveying unit 10 is further arranged on the filtering gas path, which can adopt a fan in the prior art. The fan can drive the gas in the filtering gas path to flow in one direction. The fan is specifically arranged on the filtering gas path between the dust filtering unit 2 and the condensing pipe body 3. The outlet of the condensing pipe body 3 is in communication with the forming chamber of the 3D printer through an output pipe 18, and the seventh control valve 19 is arranged on the output pipe 18.

[0038] By adopting the above scheme, during the printing process of the 3D printer, the inert gas in the forming chamber of the 3D printer returns to the forming chamber after passing through the dust filtering unit 2 and the condensing pipe body 3 in sequence through the filtering gas path, and the dust in the inert gas is filtered out through the dust filtering unit 2. Since the refrigeration unit 1 refrigerates the flowing inert gas in the condensing pipe body 3, the water vapor carried in the inert gas will form condensed water when passing through the condensing pipe body 3, so as to separate the water vapor in the inert gas and achieve the effect of drying the inert gas. On the other hand, during the printing process of the 3D printer, the laser of the 3D printer generates a large amount of heat during the printing process, so that the temperature in the forming chamber is high. The high-temperature environment will cause the equipment to run unstably. By refrigerating the flowing inert gas in the condensing pipe body 3 through the refrigeration unit 1, the condensing pipe body 3 cools the inert gas passing through the inside of the condensing pipe body 3, so as to also play a role in regulating and stabilizing the temperature in the forming chamber.

[0039] In some embodiments, the condenser tube body 3 comprises an inner shell 301 and an outer shell 302 connected together, and a heat exchange chamber 303 enclosed between the inner shell 301 and the outer shell 302. The inner shell 301 and the outer shell 302 are both circular tubes, the inner shell 301 is arranged inside the outer shell 302, and the inner shell 301 and the outer shell 302 are concentrically arranged, and the heat exchange chamber 303 is arranged around 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 in communication with the heat exchange chamber 303, and the medium inlet 304 and the medium outlet 305 are arranged near the two end portions of the outer shell 302, respectively. The bottom of the outer shell 302 is provided with a drainage channel 306, which is arranged in the body of the outer shell 302 and is separated from the heat exchange chamber 303. The inner shell 301 is a corrugated tube, and the bottom of the inner shell 301 is provided with a drainage port 307 in communication with the drainage channel 306. Specifically, the lowest part of each corrugation of the corrugated inner shell 301 is provided with a drainage port 307, and the lower end of the drainage port 307 extends downward and communicates with the drainage channel 306. The refrigeration unit 1 is configured to inject cooling medium into the heat exchange chamber 303 through the medium inlet 304, and form a circulation by flowing back through the medium outlet 305. The refrigeration unit 1 is a prior art, and specifically comprises a refrigerator and a circulating water pump. The cooling medium is cooled by the refrigerator, and the cooled cooling medium is injected into the medium inlet by the circulating water pump, and flows back to the refrigerator through the medium outlet 305 to form a circulation.

[0040] In order to improve the refrigeration effect, as a preferred, a partition plate 308 is arranged in the heat exchange chamber 303, which divides the space in the heat exchange chamber 303 to form a zigzag or spiral medium channel. In the present embodiment, it is preferred to divide the heat exchange chamber 303 into a zigzag medium channel by a plurality of partition plates 308. Specifically, the partition plate 308 is annular, and the outer ring side is connected to the inner side of the outer shell 302, and the inner ring side is connected to the outer wall of the inner shell 301. The plurality of partition plates 308 are uniformly distributed along the longitudinal direction of the inner shell 301, and the lower side of the first partition plate 308 located at the left end is provided with a gap 309 for the cooling medium to pass through, the gap 309 of the second partition plate 308 is arranged on the upper side, and the gap 309 of the third partition plate 308 is arranged on the lower side. By staggering the gaps 309 of the partition plates 308 up and down, the heat exchange chamber 303 is divided into a zigzag medium channel. The lower end of the drainage channel 306 is communicated with a water storage tank 5 through a pipeline 4, and the water storage tank 5 is placed at a height lower than the height of the condenser tube body 3.

[0041] In some embodiments, the dust filtering unit 2 comprises a cylinder body 201, a back flushing assembly 202 and a plurality of filter cartridges 203. The cylinder body 201 is internally provided with a first chamber 204 and a second chamber 205, and the cylinder body 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 cylinder body 201 comprises a cylinder body 2011 and a cover body 2012, the upper end of the cylinder body 2011 is open, the upper end of the cylinder body 2011 is closed by the cover body 2012, and the cover body 2012 is connected with the cylinder body 2011 by bolts. In order to facilitate the uncovering of the cover body 2012, two handles 2013 are fixedly connected to the upper side of the cover body 2012. The first chamber 204 and the second chamber 205 are formed by a horizontal plate 216 inside the cylinder body 201, the first chamber 204 is located below the second chamber 205, the horizontal plate 216 is provided with a plurality of mounting holes corresponding to the filter cartridges 203, and the filter cartridges 203 are arranged in the corresponding mounting holes. The filter cartridges 203 can be removed from the mounting holes when needed. The horizontal plate 216 is provided with a bracket 217 on the upper side, and the air jet head 2022 is fixedly connected to the bracket 217. The air inlet 206 is arranged on the front side of the cylinder body 2011, the air inlet 206 communicates with the first chamber 204, the air inlet 206 is communicated with an air inlet pipe 209, and the air inlet pipe 209 is provided with a fourth control valve 210. The air outlet 207 is arranged in the middle of the cover body 2012, the air outlet 207 is communicated with an 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 an input end of the gas to be purified, and the air outlet pipe 211 serves as an output end of the purified gas. The filter cartridges 203 are arranged in the first chamber 204, and the plurality of filter cartridges 203 are uniformly distributed along the left-right direction and have intervals between adjacent filter cartridges 203. The upper end of the filter cartridge 203 extends into the second chamber 205, the filter cartridge 203 has a hollow structure, and at least one air vent 208 is arranged at one end of the filter cartridge 203 in the second chamber 205. In this embodiment, the filter cartridge 203 is preferably a plate, and the one end of the filter cartridge 203 in the second chamber 205 is provided with two or more air vents 208, the air vents 208 are distributed along the width direction of the filter cartridge 203, and the air jet ports 2024 of the air jet head 2022 are arranged one by one corresponding to the air vents 208. In this embodiment, the filter cartridge 203 is preferably a sintered filter cartridge 203. The back flushing assembly 202 is arranged in the second chamber 205, and the back flushing assembly 202 is used for spraying gas into the air vent 208.

[0042] When the filter element 203 needs to be cleaned, the back flushing assembly 202 sprays high-pressure gas flow into the air vent 208, and the high-pressure gas flow enters the hollow filter element 203 and then pushes the dust accumulated on the outer surface of the filter element 203 outwards, so that the filter element 203 can be cleaned without being disassembled, thereby improving the work efficiency.

[0043] The back flushing assembly 202 includes a gas supply unit 2021 and a plurality of jet heads 2022 corresponding to the filter element 203 one by one. The gas supply unit 2021 is configured to supply compressed gas, and the gas supply unit 2021 is arranged outside the cylinder body 201. The gas inlet end of the jet head 2022 is in communication with the gas supply end of the gas supply unit 2021 through a pipeline 2023, the jet outlet 2024 of the jet head 2022 corresponds to the air vent 208, the jet head 2022 is located above the filter element 203, and the jet outlet 2024 is arranged downward. The pipeline 2023 is provided with a first control valve 2025, and the first control valve 2025 is a pulse electromagnetic valve. The pulse electromagnetic valve can make the gas flow sprayed by the jet head 2022 be a pulse gas flow. The pulse gas flow forms a vibration impact on the filter element 203, thereby improving the cleaning effect of the filter element 203. In some embodiments, the gas supply unit 2021 includes a gas storage tank and an air compressor, the air compressor inputs compressed air into the gas storage tank, and the pipeline 2023 is in communication with the gas storage tank.

[0044] The first chamber 204 is connected with a first pressure sensor 12 through a first pressure pipe 11, and the second chamber 205 is connected with a second pressure sensor 14 through a second pressure pipe 13. The first pressure sensor 12 monitors the air pressure in the first chamber 204 through the first pressure pipe 11, and the second pressure sensor 14 monitors the air pressure in the second chamber 205 through the second pressure pipe 13. In the process of filtering the gas, the gas first passes through the first chamber 204, and the filtered gas in the first chamber 204 passes through the air vent 208 into the second chamber 205, and then is outputted outward through the gas outlet 207 in the second chamber 205. When the filter element 203 is attached with a large amount of dust, the air pressure in the first chamber 204 will increase due to the obstruction of the dust, and 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 the discharge of the slag, as preferred, the bottom of the cylinder 201 is communicated with a slag discharge pipe 213, the slag discharge pipe 213 is communicated with the first chamber 204, and the second control valve 211 is arranged on the slag discharge pipe 213, and the second control valve 211 is a pressure relief valve. The bottom of the cylinder 201 is a tapered shape with a large upper part and a small lower part, so as to facilitate the convergence of the dust to the slag discharge pipe 213. In order to collect the discharged dust, as preferred, a filter bag 215 is arranged on 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 as to collect the dust in the filter bag 215, and at the same time, avoid the excessive pressure in the first chamber 204 and the second chamber 205 when the gas is injected into the filter core 203. An anti-static mesh cover is further arranged outside the filter bag 215.

[0046] In order to avoid the large particle size dust particles directly entering the filter core 203 of the dust filtering unit 2, and prolong the cleaning cycle of the filter core 203, as preferred, a cyclone separator 6 is further arranged on the filtering gas path, and the cyclone separator 6 is arranged between the inlet end of the filtering gas path and the dust filtering unit 2. The cyclone separator 6 is a prior art, the inlet of the cyclone separator 6 is communicated with an input pipe 16, the sixth control valve 17 is arranged on the input pipe 16, and the cyclone separator 6 is communicated with the forming chamber of the 3D printer through the input pipe 16. The lower end of the cyclone separator 6 is communicated with a powder collection bottle 15, the powder collection bottle 15 is detachably connected with the cyclone separator 6, and the passage of the cyclone separator 6 and the powder collection bottle 15 is provided with a vacuum butterfly valve 20.

[0047] Further comprising a waste gas pipe 7, a third control valve 8 and a waste gas filtering unit 9, the waste gas pipe 7 is communicated with the filtering gas path between the dust filtering unit 2 and the condensing pipe body 3, the third control valve 8 is arranged on the waste gas pipe 7, and the outlet of the waste gas pipe 7 is communicated with the inlet of the waste gas filtering unit 9.

[0048] Working process: Before the atmosphere culture is carried out in the forming chamber of the 3D printer, the inert gas is introduced into the forming chamber of the 3D printer and the atmosphere system, the inert gas is used to replace the internal air, the replaced gas is transported to the waste gas filtering unit 9 through the waste gas pipe 7 for filtering, and then is discharged into the atmosphere to prevent pollution.

[0049] In the process of printing work of 3D printing, the inert gas in the forming chamber is input through the input pipe 16, sequentially passes through the cyclone separator 6, the dust filtering unit 2, the condensing pipe body 3 and the output pipe 18 along the filtering gas path and returns to the forming chamber. The dust particles with large particle size are separated through the cyclone separator 6, the dust in the inert gas is filtered through the dust filtering unit 2, and the inert gas is dried through the refrigeration unit 1 and the condensing pipe body 3. Since the refrigeration unit 1 refrigerates the inert gas flowing in the condensing pipe body 3, the water vapor carried in the inert gas forms condensed water when passing through the condensing pipe body 3, so that the water vapor in the inert gas is separated out, achieving the effect of drying the inert gas.

[0050] When more dust is attached to the filter element 203, the air pressure in the first chamber 204 will be increased due to the obstruction of the dust, and 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, the backflush assembly 202 sprays high-pressure gas flow into the air vent 208, and the high-pressure gas flow enters the hollow filter element 203, and 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, improving the work efficiency.

[0052] Based on the same utility model concept, the utility model also provides a 3D printer, including the atmosphere system above.

[0053] It should be noted that the words indicating the direction, such as up and down, are set in the direction of Figure 1 , only for the convenience of description, and do not have other specific meanings.

[0054] It should also be noted that in this paper, relationship terms such as first and second 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 the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such article or device. Without more limitation, the element limited by the sentence "including a" does not exclude the existence of other same elements in the article or device including the above-mentioned elements.

[0055] The principle and implementation mode of the present application are described by using specific examples in the present application, and the above examples are only used for helping to understand the core idea of the present application. It should be pointed out that, for ordinary skilled persons in the technical field, some improvements and modifications can be made to the present application without departing from the principle of the present application, and these improvements and modifications also fall within the protection scope of the present application.

Claims

1. An atmosphere system characterized by, The application relates to a refrigeration unit (1) and a dust filtering unit (2) and a condenser pipe body (3) arranged in sequence on a filtering gas path. The refrigeration unit (1) is used for reducing the temperature of fluid in the condenser pipe body (3); The dust filtering unit (2) is used for filtering dust in gas; The inlet and outlet of the filtering gas path are communicated with a forming chamber of a 3D printer.

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

3. The ambience system of claim 2, wherein, A partition plate (308) is arranged in the heat exchange cavity (303), and the partition plate (308) divides the space in the heat exchange cavity (303) to form a meandering or spiral medium channel.

4. The ambience system of claim 2, wherein, The drainage channel (306) is communicated with a water storage tank (5) through a pipeline (4).

5. The ambience system of claim 1, wherein, The dust filtering unit (2) comprises a cylinder body (201), a back flushing assembly (202) and a plurality of filter elements (203), a first cavity (204) and a second cavity (205) are arranged in the cylinder body (201), an air inlet (206) communicated with the first cavity (204) and an air outlet (207) communicated with the second cavity (205) are arranged on the cylinder body (201), the filter elements (203) are arranged in the first cavity (204), one end of the filter elements (203) extends into the second cavity (205), the filter elements (203) are hollow structures, at least one air vent (208) is arranged at one end of the filter elements (203) in the second cavity (205), and the back flushing assembly (202) is arranged in the second cavity (205) and used for spraying gas into the air vent (208).

6. The atmosphere system of claim 5, wherein, The back flushing assembly (202) comprises a gas supply unit (2021) and a plurality of jet heads (2022) corresponding to the filter elements (203) one by one, the gas supply unit (2021) is used for supplying compressed gas, the air inlet end of the jet head (2022) is communicated with the gas supply end of the gas supply unit (2021) through a pipeline (2023), the jet port (2024) of the jet head (2022) corresponds to the air vent (208), and the pipeline (2023) is provided with a first control valve (2025).

7. The atmosphere system of claim 6, wherein, The cylinder body (201) is communicated with a residue discharge pipe (213), the residue discharge pipe (213) is communicated with the first cavity (204), and the residue discharge pipe (213) is provided with a second control valve (211).

8. The atmosphere system according to any one of claims 1-7, wherein, A cyclone separator (6) is further included on the filtered air passage, and is disposed between the inlet end of the filtered air passage and the dust filtration unit (2).

9. The atmosphere system according to any one of claims 1-7, wherein, A waste gas pipe (7) is further included, which communicates with the filtered air passage, a third control valve (8) is disposed on the waste gas pipe (7), and the outlet of the waste gas pipe (7) communicates with the inlet of a waste gas filtration unit (9).

10. A 3D printer characterized by, An atmosphere system as claimed in any one of claims 1-9.

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