Gas Extraction in 3D Printer Chambers

Intelligent deoxygenation and purification system for metal 3D printers that reduces oxygen content, improves print quality, and saves gas consumption. The system uses a closed-loop gas circulation with vacuum pump, filters, and solenoid valves to continuously clean and deoxygenate the printing chamber. It also detects oxygen and pressure levels in real-time to optimize conditions and prevent contamination. The loop recirculates gas through a filter, smoke purifier, and exhaust to remove impurities and reduce oxygen. This avoids excessive gas consumption compared to periodic purging.

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Impurity removal device for 3D printers that reduces oxygen concentration in the print chamber gas to prevent defects in printed parts. The device has a gas supply unit, a removal body that removes impurities by heating, and a removal unit containing metal like titanium or alloys like magnesium, aluminum, calcium. Before supplying the gas to the printer, oxygen is removed using the device. A filter removes moisture/CO2. A mixing unit combines powder and gas. This prevents oxygen-containing gases from printing metal parts with affinity for oxygen.

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A removable gas purification device for 3D printers that attaches externally to the printer and connects to the print chamber. The device has a filter element inside a sealed housing. It draws air from the print chamber through an inlet, filters the gases, then returns the purified air through an outlet back into the chamber. This allows external filtration and reduces heat loss compared to internal filters. The device attaches behind the printer's fan and accelerates part curing. The filter housing has channels to connect to the print chamber and fan.

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A device and method to improve quality of 3D printed objects by optimizing the process gas environment. The device has multiple separable filter chambers in the gas circuit that can be individually isolated during printing. This allows cleaning or replacing filters without interrupting printing. It uses sensors to monitor differential pressure across filters and volume flow. Cleaning is triggered when thresholds are exceeded. This prevents sudden flow changes from separating filters.

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Negative pressure powder feeding system for additive manufacturing that addresses issues of powder clogging, oxygen content, and efficiency compared to prior systems like manual, positive pressure, and negative pressure feeding. The system uses a sealed transition chamber with an inert gas inlet that can be opened after powder reaches a certain height. This dilutes the oxygen content in the chamber before printing starts. A blower evacuates the chamber, preventing powder clogging and sealing issues. The system also has a filter and pulse valve to prevent powder blocking the exhaust. The chamber can be pressurized with inert gas between prints to further lower oxygen levels.

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An additive manufacturing system that uses gas flow to remove smoke and particles from the chamber during manufacturing, improving the quality of printed objects. The system has an upper gas flow along the build platform and a lower gas flow directed parallel to the platform. The lower gas is introduced above or below the platform and guided by a contoured surface to flow parallel to the platform surface. This gas flow configuration prevents recirculation and efficiently removes smoke and particles from the chamber.

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A gas extraction system for a 3D printing apparatus that allows precise control of the temperature and airflow in the printing chamber. The system uses a primary conduit with a primary inlet, interfacing inlet, and outlet. A secondary conduit connects the primary conduit to the working space inlet. Flow control devices regulate the flow of gas from the working space into the secondary conduit, which is then suctioned out by an external extraction source. This allows precise control of the temperature and airflow in the printing chamber while removing fumes and byproducts.

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Automated optimization of evacuation gas flow (EGF) in additive manufacturing (AM) build chambers to improve component quality. The method involves receiving input parameters like chamber geometry and operating conditions, simulating gas flow in the modified chamber, extracting evacuation streamlines, and calculating flow improvements using a metric. This iterative process resolves an optimal chamber design with maximized EGF.

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A fume extraction system for 3D printers that allows printing at high temperatures without releasing noxious fumes. A pump pulls air from the printer chamber through a filter to remove particulates and fumes. The filtered air is returned to the chamber. The filter contains an adsorption filter to remove noxious fumes. The system can operate in different modes during printing to maintain chamber pressure and temperature.

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A fume extraction system for large-scale additive manufacturing machines that prevents contamination between work zones when using multiple energy beams to consolidate the powder. The system uses fixed-side manifolds and a movable central manifold above the overlap zone between adjacent work zones. The central manifold extends over the full transverse dimension and can translate longitudinally to cover the entire work surface. This allows fume extraction close to the powder without beams crossing work zones.

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A device to remove harmful gases generated during 3D printing. The device is installed in the nozzle of a 3D printer and removes harmful gases like heavy metals emitted during printing. It consists of a filter unit to collect the gases and an intake unit to suck the gases into the filter. The filter contains materials like activated carbon and diatomaceous earth to absorb the harmful gases. The filter unit is located in a housing with an intake from the nozzle and an outlet to exhaust the filtered gases.

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Reducing the amount of process gas wasted during additive manufacturing by collecting and reusing fluid displaced from the process chamber. The fluid is collected and/or fed back into the chamber or into another apparatus's chamber based on its process gas content. The collected fluid can be purified to increase the process gas content.

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An additive manufacturing apparatus with a gas recirculation loop purifies the inert cover gas used during the process. The loop removes impurities from the cover gas to generate a clean cover gas that can be reintroduced into the chamber for the additive manufacturing process. The loop includes purification devices like particle filters and gas scrubbers to remove solid and gaseous impurities.

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A closed-loop system to purify the air inside a 3D printer enclosure during printing to remove harmful gases generated during the process. The system has a chamber with a removable tray for the 3D printer, an air pump, filters, and a vibration sensor. The pump sucks air from the bottom, filters it, and pumps it back. The sensor detects 3D printer vibration to start/stop the pump. It also measures air quality and adjusts pump speed. This captures and filters the toxic gases emitted during printing to prevent indoor exposure.

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Gas delivery and purging device for additive manufacturing chamber to reduce purge times and gas volume by allowing a gas like argon to flow into the chamber in a non-turbulent, laminar manner that displaces other gases and forces them out. The device uses flexible tubes with pores across their entire surface area.

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A sealed enclosure for 3D printers that captures and filters the odorous gases produced during printing to prevent operator exposure and environmental pollution. The enclosure has a door with a transparent window, adjustable feet to level the printer, and a skirt with sealing foam around the door. Inside are components like an exhaust fan, filters, gas sensor, and check valves to draw in air, filter it, and expel cleaned air. The enclosure seals tightly with compacted foam around the door panels to prevent air leaks.

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Method and device for circulating and purifying impurity gas in a low positive pressure sealed molding chamber used in additive manufacturing like laser selective melting (SLM). The method involves continuously circulating and purifying the gas inside the sealed molding chamber to maintain low oxygen levels, prevent oxidation, and remove metal dust particles. The purification system has a filter to collect metal dust and a feedback loop to monitor key indicators like oxygen concentration and cleanliness. This improves part quality, prevents contamination, and mitigates health risks compared to simple filters.

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Regulating pressure within a three-dimensional printer to maintain consistent quality of printed parts. The pressure within the printer can fluctuate due to variations in the extraction rate of an external gas extraction system. An apparatus is installed in the printer that measures the pressure and compares it to a predetermined value. If the pressure is too low, the apparatus opens apertures in the printer to allow ambient air to flow into the extraction system. This stabilizes the pressure and maintains consistent part quality.

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Gas circuit for 3D printing equipment with improved reliability and reduced maintenance compared to traditional designs. The circuit includes a circulation system with filters to continuously clean and recirculate the inert gas inside the printing chamber. This prevents pollution buildup in the pressure relief components. If chamber pressure rises, a mechanical protection device automatically adjusts the pressure instead of relying solely on the pressure relief valve. This prevents sudden pressure spikes that could shut down the equipment. The circuit also has features like seals and valves to isolate and control the gas flow between components.

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Atmosphere purification system for metal 3D printers to capture and reuse the inert gas in the printing chamber instead of continuously replacing it. The system has multiple filters arranged in series along the gas flow path. The filters are a cyclone, a high-efficiency filter, and another high-efficiency filter. Secondary filters are also parallel between the primary and tertiary filters. The secondary filters have control valves and connected backflushing gas bags. The system also has a cleaning passage connecting the printer and the atmosphere. The cleaning passage has valves, sensors, and a blower. The system purifies and reuses the inert gas by backflushing the secondary filters with the printer gas, then cleaning the filters and pipes with inert gas inflow.

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Additive manufacturing process chamber housing that improves powder bed fusion process efficiency by increasing gas flow rate without depleting the powder bed. The housing has a gas inlet and outlet to provide inert gas flow through the process chamber. The inlet and outlet are at opposite sides of the process chamber. The bottom has a support opening for a movable support. The gas inlet and outlet are configured to provide a gas flow in a main flow direction over the support opening. The housing has a door panel that can be closed to block access to the process chamber.

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Gas protection system for 3D printing that reduces gas consumption and allows gas recycling compared to enclosed print chambers. The system uses a gas protection cover above the nozzle to directly shield the extruded material from air. This prevents oxidation and improves print quality. A vented platform allows gas circulation around the print. A two-position valve and storage tank enable switching between inert gas and air, allowing gas recovery during print pauses. This reduces gas consumption compared to continuously purged enclosures.

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3D printing system with dehumidification and recycling of the print chamber gas to improve print quality and reduce solvent waste. It uses a heat exchanger with a chiller to dehumidify the print chamber gas by cooling it below saturation. A sensor measures humidity and temperature, and the chiller valve is controlled to maintain a target absolute humidity. This recycles the dehumidified gas back into the printer.

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Gas extraction system for 3D printers that enables precise temperature control and particulate removal from the build chamber. The system has a primary conduit with an external inlet and outlet, and a secondary conduit connecting the build chamber to the primary. Flow control devices regulate gas extraction between the secondary and primary. This allows separate extraction from the chamber vs the environment. By connecting to an external exhaust, it prevents contaminants from entering the room. The internal flow control allows optimized extraction without overpowering. The system extracts excess heat and particles while avoiding external extraction variations.

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An additive manufacturing process that uses a movable gas exchange manifold system with the recoater mechanism to provide controlled gas exchange during the recoat cycle between print cycles. The manifold moves with the recoater over the powder bed to remove contaminated gas and add clean gas. This prevents accumulation of soot and other contaminants that can affect print quality.

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Apparatus for additive manufacturing that allows precise control of the gas stream used in the process. The apparatus includes a gas processing device that determines the composition of the gas stream and guides it to either a purification device or back to the process chamber based on the determined composition. This allows adjusting the gas composition to optimize the additive manufacturing process for the specific build material being used.

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An atmosphere control system for metal powder 3D printers that prevents oxygen impurities from affecting the metal parts. The system consists of a closed print chamber, carbon filter, glycerin filter, cooling deoxidation tank, and blower all connected inside the printer frame. The print chamber is sealed above the filters and tanks. The carbon filter removes oxygen from the powder, the glycerin filter removes carbon residue, the cooling tank removes oxygen through deoxidation, and the blower circulates the purified gas. This prevents oxygen from external air entering the powder during handling, storage, feeding, and transfer.

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Large-scale additive manufacturing machine with multiple gas flow systems to perform various functions like electronics cooling, condensate evacuation, and component cleaning with purge air. Each gas flow system has a dedicated circulation loop for circulating gas to the specific subsystem. This allows for more versatile and efficient gas flow compared to a single gas loop system.

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An atmosphere purification method and system for metal 3D printing to mitigate smoke and dust generation during printing and prevent explosion hazards. The method involves continuously circulating an inert gas like nitrogen through the printing chamber and a filter assembly connected to it. This purges and filters the air inside the chamber to remove smoke, dust, and unreacted powder. The inert gas is then reused in the chamber instead of continuously filling it with new inert gas. This prevents contamination, explosion risks, and waste of expensive inert gases.

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Additive manufacturing systems that maintain consistent conditions within the print chamber to improve 3D object properties. The system uses multiple fans and sensors to control gas pressure and flow rate in the print chamber. The fans maintain the desired pressure and flow rate while sensors monitor the conditions. This allows the system to compensate for variations in suction or external conditions to maintain consistent conditions inside the print chamber.

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Organic gas processing device for 3D printers that captures and filters toxic fumes during printing to improve indoor air quality. The device has a box with separate chambers for printing and post-processing. An air pump pulls fumes from the print chamber through a filter box. The filtered air is sent to the post-processing chamber via a solution tank. Exhaust from the post-processing chamber goes through a dust filter before exiting. This prevents fumes from entering the workspace.

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Controlling the gas environment in an additive manufacturing chamber to reduce process gas usage during 3D printing. It uses an adsorbent like molecular sieves to remove reactive gases like oxygen from the manufacturing space when detected at thresholds. A pump returns the gas with adsorbed reactive gas to the chamber. This allows reusing the process gas without introducing new reactive gases. A control unit activates the pump when sensors detect above thresholds. This recirculates the gas with adsorbed reactive gases instead of continually feeding fresh process gas.

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Regulating pressure inside a 3D printer when connected to external extraction systems with varying gas extraction rates. An apparatus allows controlling the amount of ambient air allowed to flow into the external extraction system to compensate for irregularities in suction. This maintains consistent pressure inside the printer and prevents issues like unexpected gas flows and pressure fluctuations that can affect print quality and damage printed parts.

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A gas replacement device for reducing oxygen content in closed chambers like 3D printing chambers. The device has a rigid chamber, an elastic element inside, valves, and a source of inert gas. The elastic element expands when air pressure decreases during gas extraction, sealing the chamber. Valves control gas flow and oxygen sensors monitor levels. This allows rapid oxygen removal and chamber purging compared to traditional methods.

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Selective solidification 3D printer that improves print quality by controlling gas flow to remove contaminants from the build area. The printer has switchable gas nozzles at the edge of the build area that can be toggled between suctioning gas from the chamber and a functionless state. The nozzles are controlled based on the printer's operating state to suction away fumes, particles and residues without disturbing the object being printed.

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Gas replacement device for reducing oxygen levels in enclosed spaces like 3D printing chambers. The device uses an elastic expansion and contraction element inside a sealed chamber. A gas source, valves, and sensor are connected. The method involves: 1) Purging the chamber with inert gas from the source through the first valve. 2) Closing the first valve and opening the second valve to let the elastic element expand, displacing the inert gas with air. 3) Closing the second valve and opening the first valve to extract the displaced air. 4) Repeating until oxygen levels are low enough. The elastic expansion reduces pumping time compared to constant vacuuming.

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Operating method and device for metal printing devices that improves cleaning of the printing chamber between prints and during printing. The method involves using a single blower with switchable operation modes. During printing, the blower pulls process gas from the chamber to regenerate it. After printing, the blower sucks out excess particles. This allows continuous printing without interrupting the process. The blower can be combined with different regeneration devices in a module connected to the chamber. The module has separate suction and pressure lines.

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Intelligent deoxygenation and purification system for metal 3D printers that reduces oxygen levels in the printing chamber to improve part quality. The system uses vacuum, gas supply, and circulation to lower oxygen. Real-time oxygen and pressure sensors detect levels and trigger actions. This ensures a low-oxygen, stable environment for laser melting. The circulation system recycles chamber gas through a filter. This saves protective gas, reduces dust, and lowers air pollution.

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Purification system and method for metal 3D printers that reduces oxygen content in the build chamber to improve part quality. The system has a purification device like a column to remove oxygen. It connects to the build chamber with valves and a fan. A circulation loop moves deoxygenated gas from the purifier to the chamber. During printing, oxygen is monitored and the loop flushes fresh gas to prevent oxygen rise. This ensures low oxygen levels for sensitive alloys that avoids oxidation, spheroidization, and defects.

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A multi-channel dual-circulation atmosphere protection system for metal additive manufacturing like selective laser melting (SLM) to improve gas protection, reduce oxygen levels, prevent explosions, and enable higher print quality. The system uses multiple gas channels for replacement, circulation, reduction, vacuum, and filtration. Analyzers monitor oxygen, water, pressure, temperature, and dust. A central control system coordinates gas flows, replacement, circulation, reduction, vacuum, and filtration based on sensor data. This provides better gas management, lower oxygen levels, and prevents explosive powder dust.

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Protective gas box for metal 3D printers that reduces oxygen content inside the printer chamber more efficiently and economically compared to injecting inert gas. The box has a rotary blower with multiple speed settings to continuously extract and replace air inside the box. This dilutes the oxygen content faster than just injecting inert gas. The blower also has a timer function to automatically cycle between speeds for optimal oxygen reduction.

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A gas circulation system for 3D printers that improves indoor air quality by capturing and removing harmful gases generated during printing. The system has an intake mechanism below the printer, a filter mechanism with activated carbon and desiccant, a dust removal mechanism with cotton, and an exhaust mechanism above the printer. A fan draws air through the intake, filters it, removes dust, and discharges it. This recirculates clean air inside the printer while capturing and removing formaldehyde, moisture, and dust.

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A gas purification system for 3D printing chambers to recycle and filter the gas containing printing smoke and oxides. The system has a blower to transport the contaminated gas from the printing chamber to a purification device. The device has stages of filtration: initial filtration by cotton, then deceleration to settle particles, followed by final filtration by a cartridge. The purified gas is then returned to the printing chamber. The multi-stage filtration recovers powder, reduces load on filters, improves gas quality, and enables recycling.

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A gas circulation air inlet separation device for 3D printing that improves the effectiveness of gas recirculation in metal powder bed fusion printers. The device separates the inlet air into upper and lower streams to better distribute the recycled gas in the printer chamber. It uses a bracket with a through hole for the inlet pipe and a three-way pipe to separate and direct the air. One branch goes up and out of the chamber, the other goes down. This prevents smoke and dust buildup on the window and laser surface. The separated lower stream provides direct blowing for the build plate.

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A hazardous gas removal device for 3D printers that captures and filters toxic gases generated during the printing process. The device is installed near the printer nozzle and has an intake unit to suck in the fumes. The gases are then passed through a filter to remove harmful substances like monomers, decomposition products, nanoparticles, and hazardous byproducts from the polymerization process. The filtered air is vented outside. The device enables safe operation of 3D printers by capturing and treating the hazardous gases generated during printing before they can escape into the workspace.

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Intelligent deoxygenation cycle purification method and equipment for metal 3D printers that reduces oxygen levels in the print chamber to improve print quality while minimizing consumables and waste. The method involves vacuuming the chamber, supplying fresh gas, circulating through a filter, and detecting oxygen and pressure levels to optimize deaeration and purging. It uses sensors to monitor chamber conditions, automating the oxygen reduction process and preventing overpressure.

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Additive manufacturing apparatus that allows for faster and more efficient inertization of the process chamber without requiring a large volume of inert gas to be circulated throughout the chamber. The apparatus uses a suction device that locally sucks process gas from the chamber and guides it out via a slit-like opening. This allows for targeted inertization of the build plane without requiring the entire chamber to be inertized.

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A molding room purification system for SLM 3D printers that actively exhausts the chamber using a fan to remove smoke and particles during the printing process. The system has an inert gas tank connected to the chamber, a filter element between the exhaust pipe and fan, and a separate pipe connecting the fan outlet to the chamber outlet. This allows the fan to actively exhaust the chamber while blowing fresh inert gas in, creating airflow to push out smoke and particles. The filter removes impurities from the circulating gas.

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A molding room purification system for small-scale selective laser melting (SLM) 3D printers that improves part quality by controlling oxygen levels during printing. The system uses an inert gas tank connected to the printer chamber, a blower, filters, and valves to continuously purge oxygen from the chamber. Smoke generated during printing is filtered and exhausted. An oxygen sensor monitors chamber oxygen levels.

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Gas circulation system for 3D printing to provide oxygen-free environment and gas purification for metal powder bed fusion printing. The system has a gas filtering unit connected to the print chamber via pipes with branch pipes extending into the chamber. The filtering unit cleans and circulates the inert gas to remove impurities and maintain oxygen levels for printing. Valves switch between preparation and printing modes. A sensor monitors chamber conditions and controls the system.

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