CN114522650A - Atmosphere protection device and method for removing water and oxygen by atmosphere protection device - Google Patents
Atmosphere protection device and method for removing water and oxygen by atmosphere protection device Download PDFInfo
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- CN114522650A CN114522650A CN202210299892.4A CN202210299892A CN114522650A CN 114522650 A CN114522650 A CN 114522650A CN 202210299892 A CN202210299892 A CN 202210299892A CN 114522650 A CN114522650 A CN 114522650A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J19/14—Production of inert gas mixtures; Use of inert gases in general
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B33—ADDITIVE MANUFACTURING TECHNOLOGY
- B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
- B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the technical field of additive manufacturing and processing, in particular to an atmosphere protection device and a method for removing water and oxygen by using the same, wherein the atmosphere protection device comprises a sealed box body and an internal circulation module, the bottom of the sealed box body is provided with an air inlet, the top of the sealed box body is provided with an air outlet, the internal circulation module is circumferentially arranged on a longitudinal section of the inner wall of the sealed box body, and the internal circulation module can change the flow direction of air flow by adjusting the blowing angle of the internal circulation module. The invention changes the flowing direction of the air flow on the longitudinal section by driving the internal circulation module to adjust the blowing angle, breaks through the natural state that the air is extruded from bottom to top, is beneficial to eliminating local circulation dead zones and discharging the water and oxygen accumulated in the dead zones along with the circulation air flow organization, can effectively shorten the establishment time of inert atmosphere, reduce the consumption of the inert atmosphere and reduce the processing cost.
Description
Technical Field
The invention relates to the technical field of additive manufacturing and processing, in particular to an atmosphere protection device and a method for removing water and oxygen by using the same.
Background
The existing atmosphere protection device for additive manufacturing mostly adopts a hexahedral rigid closed box body, and an inert atmosphere environment is established in the closed box body to finish the anti-oxidation processing of parts; specifically, taking a longitudinal section of a sealed box as an example, as shown in fig. 1, inert gas is filled through a box inlet, air is exhausted through a box outlet, and air is circularly filled and exhausted for replacement until the oxygen content in the box meets the part processing requirement.
The replacement mode is layered up and down by depending on the characteristic that the density of the inert gas is greater than that of air, so that an inert atmosphere environment is established. However, for the additive manufacturing of large aviation structural parts, a large atmosphere protection device is required to be configured, wherein the large atmosphere protection device comprises a large box body and a water and oxygen removal device; because the box body is overlarge in volume, if gas replacement is still carried out only through a one-way flow field airflow structure according to the prior art, gas can generate local vortex at the corners of the box body easily to form a circulation dead zone, as shown in fig. 2, so that residual water and oxygen are difficult to replace, the inert atmosphere is long in establishing time and low in efficiency, further, the inert gas consumption in the machining process is huge, and the machining efficiency and the machining cost of parts are seriously influenced.
Disclosure of Invention
The invention aims to: aiming at the problems that in the prior art, when inert gas is input into a rigid closed box body, air is discharged by means of natural layering, residual water and oxygen at dead corners of the box body are difficult to replace, and the inert atmosphere building time consumption is long and the processing cost is high, an atmosphere protection device and a water and oxygen removing method thereof are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
in one aspect, the invention provides a method for removing water and oxygen by an atmosphere protection device, which comprises the following steps:
filling a first preset-purity inert gas into the sealed box body, wherein the gas in the sealed box body can be upwards discharged through the gas outlet to form a unidirectional flow field gas flow organization which is sent downwards and sent upwards;
when the oxygen concentration in the sealed box body is reduced to be lower than a first set value, filling inert gas with second preset purity into the sealed box body, wherein the second preset purity is higher than the first preset purity; in the process of inflation, circumferential circulating airflow is formed on the longitudinal section along the inner wall of the sealed box body, the gas in the sealed box body can still be discharged upwards through the gas outlet,
until the water concentration and the oxygen concentration in the sealed box body meet the processing requirements.
High-purity inert gas is continuously filled into the sealed box body, and the inert gas extrudes upper air from the air outlet from bottom to top, so that a one-way flow field airflow organization is formed until the oxygen concentration in the sealed box body is reduced to a first set value; then filling inert gas with higher purity into the sealed box body, constructing circumferential circulating airflow on the longitudinal section along the inner wall of the sealed box body in the sealed box body, carrying out airflow entrainment in the box body, breaking the stable order of unidirectional airflow from bottom to top and improving the gas replacement rate; through establishing circulation flow field air current tissue in the seal box body, on the one hand with a small amount of air and the difficult water oxygen and the inert gas intensive mixing of replacing of local position in the seal box body, and discharge the seal box body, on the other hand with the inert gas intensive mixing of the inside original concentration of high-purity inert gas and box, along with the going on of circulation, the inert gas concentration in the seal box body improves gradually, until satisfying except that water oxygen processing requirement. The method for removing the water and the oxygen is beneficial to removing the circulation dead zone, reducing the difficulty of water and oxygen replacement, accelerating the establishment speed of the inert atmosphere, effectively reducing the consumption of inert gas and reducing the cost.
It should be noted that the invention can fill inert gas with higher purity step by step to be mixed continuously, the concentration of the inert gas in the box body is gradually increased in the process of replacing air and water oxygen, the gradient times of the purity of the filled inert gas can be adjusted according to actual needs, but the purity of the filled inert gas should meet the processing requirements established by the atmosphere protection environment. The circulating gas flow in the above may be in a one-way circulating form, a two-way circulating form, etc. The longitudinal section is a section along the vertical direction, and the section direction is consistent with the airflow direction of the unidirectional flow field from bottom to top; the longitudinal section in this context is not limited to the division of the section along only the length direction or the width direction of a regular six-sided box, but the box structure may also be irregular, and the longitudinal section may be a longitudinal section in any direction on a plane. Furthermore, for the convenience of better describing the air flow pattern of the whole inner space of the sealed box body, only the air flow pattern formed on a certain longitudinal section is illustrated herein, and in fact, the sealed box body in the present document is not limited to only the circumferential circulation air flow formed on the longitudinal section of a single specific position.
Preferably, in the exhaust stage of the process of filling the first preset-purity inert gas, the gas outlet is communicated with the atmosphere; and in the exhaust stage of the process of filling the second preset-purity inert gas, blocking the gas outlet from being communicated with the atmosphere, communicating the gas outlet with the gas supply port of the dehydrated oxygen purification module, and communicating the gas exhaust port of the dehydrated oxygen purification module with the gas inlet of the sealed box body. The water and oxygen removal purification module is used for removing water and oxygen components in the discharged gas. After a large amount of air in the box body is exhausted, the gas in the box body is filtered to remove the water oxygen through the water oxygen purification module, so that the inert gas can be reused, the waste of the inert gas is reduced, and the economic cost is reduced.
Preferably, in the process of filling the second preset-purity inert gas, a unidirectional circulation flow field airflow structure is constructed on the longitudinal section along the inner wall of the sealed box body, and a diffusion flow field airflow structure is constructed when the oxygen concentration in the sealed box body is reduced to be lower than a second set value. The diffusion flow field air flow is divided into two directions, one is rotated in the counter-clockwise circumferential direction, and the other is rotated in the clockwise circumferential direction. Compared with a diffusion flow field, the method is more favorable for accelerating the mixing rate of the inert gas and the main residual water oxygen in the early stage of replacement by establishing the airflow structure of the unidirectional circulation flow field, and can ensure that the water oxygen and the inert gas are mixed more uniformly and stably; diffusion flow fields do not allow water oxygen and inert gas to mix very uniformly, and if the order of gas flow organization is changed, a large amount of useful inert gas may be discharged: for example, the proportion of inert gas in the gas exiting the recirculation flow field can slowly rise from 90% to 99%, while the gas content exiting the diffusion flow field may be 90% for a while and 99.9% for a while, uncontrollable.
Further preferably, when the oxygen concentration in the sealed box body is reduced to be below a second set value, the air outlet is switched from the state of being communicated with the atmosphere to the state of being communicated with the dehydrated oxygen purification module, and a circulation passage is constructed between the air inlet and the air outlet, namely the air inlet, the inner space of the sealed box body, the air outlet, the dehydrated oxygen purification module and the air inlet. After the exhaust stage of the unidirectional circulation flow field airflow organization, the oxygen concentration is reduced to be low enough, and then the step of internal circulation for removing water and oxygen is carried out, so that the service time of the purifying material is prolonged, the regeneration frequency of the purifying material is reduced, and the use cost is saved.
In another aspect, the present invention provides an atmosphere protection device using the above method for removing water and oxygen. The atmosphere protection device comprises a sealed box body and an internal circulation module, wherein an air inlet is formed in the bottom of the sealed box body, an air outlet is formed in the top of the sealed box body, the internal circulation module is circumferentially arranged on a longitudinal section along the inner wall of the sealed box body, and the internal circulation module can change the flow direction of air flow by adjusting the offset angle of the internal circulation module.
According to the atmosphere protection device provided by the invention, inert gas is continuously fed through the gas inlet at the bottom, and the inert gas is gathered upwards from the bottom of the sealed box body by utilizing the characteristic that the density of the inert gas is greater than that of air, so that most of air is extruded out of the box body from the gas outlet at the top; when detecting that oxygen concentration in the box drops to the default, through the inner loop module regulation angle of blowing of circumference arrangement on sealed box inner wall longitudinal section, the air current that makes the incasement longitudinal section can flow around inner wall circumference, disturbs the gaseous order state of up one-way displacement from down, does benefit to the inert gas book of high concentration and inhales the difficult replacement water oxygen of a small amount of attached air of wall and corner department to discharge through the gas outlet, reduced and got rid of the water oxygen degree of difficulty in the bulky box, improved gas replacement efficiency.
According to the invention, the air flow organization form in the sealed box body can be adjusted through the internal circulation module, the natural state that air is squeezed by air from bottom to top is broken, the local circulation dead zone is favorably eliminated, water and oxygen accumulated in the dead zone are discharged along with the circulation air flow organization, the inert atmosphere establishing time can be effectively shortened, the consumption of the inert atmosphere is reduced, and the processing cost is reduced.
The internal circulation module can adopt a fan structure with an independently adjustable angle, changes the flow direction of the air flow by adjusting the blowing angle of the fan, or adopts a flow deflector, a louver blade and the like for adjusting the flow field of the air flow in the sealed box body; the arrangement density and the arrangement direction of the internal circulation modules can be adjusted according to actual needs.
Preferably, the adjacent surfaces of the sealed box body are in transition connection through cambered surfaces. The cambered surface can be an integrated molding surface of the sealing box body, and can also be formed by an arc-shaped guide cover additionally arranged at the joint edge of adjacent planes. The cambered surface is arranged at the joint of the adjacent surfaces of the sealing box body for transition, so that friction and collision between local fluids are reduced, the fluid resistance of contact between gas and a wall plate of the sealing box body is reduced, the speed loss is reduced, the fluid speed is increased, local vortex is prevented from being generated, and a circulation dead zone is eliminated.
Preferably, the atmosphere protection device for additive manufacturing further comprises a water-removing oxygen purification module, wherein an air supply port of the water-removing oxygen purification module is connected with an air outlet of the sealed box body, and an air exhaust port of the water-removing oxygen purification module is connected with an air inlet of the sealed box body, so that the air exhausted from the air outlet can be filtered by the water-removing oxygen purification module and then is filled into the sealed box body again, and the inert gas consumption is reduced, and the processing cost is reduced.
Preferably, the gas outlet is connected with the water and oxygen removal purification module through a gas exhaust pipeline and discharges gas through the gas exhaust pipeline, the gas inlet is connected with the water and oxygen removal purification module through a gas supply pipeline and is connected with an inert gas charging source through a gas supply pipeline, valves are arranged at a gas supply port and a gas exhaust port of the water and oxygen removal purification module, a gas discharge port of the gas exhaust pipeline and an inert gas charging source gas charging port, the valves can be switched to be in an on-off state through the gas charging and discharging module, and the gas charging and discharging module is connected with the control module. According to the replacement condition of water oxygen/air in the sealed box body, the air charging and discharging module is driven at a proper time to adjust the gas flow direction of the gas discharging pipeline and the gas feeding pipeline, the water-removing oxygen purification module is reasonably utilized, the service life of the purification material is prolonged, and the cost is reduced.
Preferably, the internal circulation module is a plurality of fans arranged inside the sealed box body. The specific number and the position of the fans are determined according to the actual requirements of the sealed box body, and the circulating airflow is formed in the box body by reasonably adjusting the deflection angles of the fans at different positions, so that the method is simple, efficient and economical. The internal circulation module can also select other similar mechanical structures which can accelerate the gas flow speed and adjust the steering, such as louvres, guide vanes and the like.
Preferably, the sealed box is provided with a skylight. The skylight is more beneficial to the maintenance of large parts of processing equipment, and the environmental suitability is improved.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the method for removing the water and the oxygen, provided by the invention, most of air is naturally exhausted from bottom to top by filling high-purity inert gas, then a circulating airflow field is constructed on the longitudinal section of the gas in the box along the inner wall of the sealed box body along the circumferential direction, airflow entrainment is carried out in the box body, the unidirectional airflow flowing order is broken, the gas replacement rate is improved, the local circulating dead zone is favorably eliminated, the water and the oxygen accumulated in the dead zone are exhausted along with the circulating airflow organization, the inert atmosphere establishing time can be effectively shortened, the consumption of the inert atmosphere is reduced, and the processing cost is reduced.
2. According to the method for removing the water and the oxygen, provided by the invention, the inert gas with higher purity is gradually filled into the sealed box body in a graded manner, the inert gas with lower purity is used for replacing air and water and oxygen at the position where the air and the part are difficult to replace, and then the inert gas with higher purity is used for replacing the inert gas with original purity in the box body until the processing requirement is met, so that the consumption of the inert gas with high purity is reduced, the cost is reduced, and the establishment process of an inert atmosphere protective environment is accelerated.
3. After the exhaust stage of the unidirectional circulation flow field airflow organization, the oxygen concentration is reduced to be low enough, at the moment, the internal circulation water and oxygen removal step is carried out, and the gas in the sealed box body is subjected to water and oxygen removal and purification module to remove residual water and oxygen in the inert gas and is recycled in the sealed box body, so that on one hand, the consumption of the inert gas is reduced, the economic cost is reduced, on the other hand, the service time of a purification material is prolonged, the regeneration frequency of the purification material is reduced, and the use cost of the water and oxygen removal material is saved.
4. According to the atmosphere protection device provided by the invention, the internal circulation module is circumferentially arranged on the longitudinal section of the inner wall of the sealed box body, so that the flow direction of air flow on the longitudinal section is changed by adjusting the blowing angle of the internal circulation module, the ordered state of unidirectional displacement of air from bottom to top is disturbed, high-concentration inert gas can circularly flow around the inner wall, a small amount of air attached to the wall and water and oxygen which are difficult to displace at corners are sucked and discharged through the air outlet, the difficulty in removing the water and oxygen in the large-volume box body is reduced, the gas displacement efficiency is improved, and the consumption of the inert gas is reduced.
5. According to the atmosphere protection device provided by the invention, the cambered surface is arranged at the joint of the adjacent surfaces of the sealed box body for transition so as to reduce the friction and collision between local fluids, thereby reducing the fluid resistance of gas contacting with the wall plate of the sealed box body, reducing the speed loss, accelerating the fluid speed, avoiding the generation of local vortices, eliminating a circulation dead zone, reducing the difficulty of water and oxygen replacement at corners, and being beneficial to accelerating the air replacement efficiency.
Drawings
Fig. 1 is a schematic view (in longitudinal section) of the gas flow pattern of the prior art in establishing an inert atmosphere processing environment for a rigid sealed enclosure.
Fig. 2 is a schematic diagram of the principle of cyclic dead zone formation.
Fig. 3 is a perspective view of an atmosphere protection device for additive manufacturing according to the present invention.
Fig. 4 is a schematic structural view of the blower used in embodiment 1.
FIG. 5 is a side view of the blower of FIG. 4.
FIG. 6 is a schematic view of the arrangement of the atmosphere protecting device when removing water and oxygen (longitudinal sectional direction).
FIG. 7 is a schematic view showing the structure of the gas flow in the stage of replacing the discharged water with oxygen in the standing state in example 2.
FIG. 8 is a schematic view showing the structure of the flow of the oxygen phase of the circulating replacement drainage in example 2.
FIG. 9 is a schematic view showing the structure of the gas flow in the water-oxygen removal stage of the agitation cycle in example 2.
FIG. 10 is a perspective view of the curved pod as it is mounted to a partial corner of the enclosure.
Icon: 1-sealing the box body; 1A-an air inlet; 1B-gas outlet; 1C-skylight; 1D-sealing door; 2-a fan; 3-arc air guide sleeve; 4-a water and oxygen removal purification module; 5-filling inert gas into the source; 6-a first valve; 7-a second valve; 8-a third valve; 9-a fourth valve; 10-a control module; 11-inflation and exhaust module.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
An atmosphere protection device for additive manufacturing, as shown in fig. 3-6, comprises a rigid sealed box body 1 for providing a processing space, an internal circulation module for adjusting different forms of gas flow fields in the sealed box body 1, a water and oxygen removal and purification module 4 for removing water and oxygen, a monitoring module for detecting information such as water and oxygen in the sealed box body 1, and accessories such as necessary connecting pipelines, a control module 10 for integrated control, an air charging and exhausting module 11 for switching an air charging and exhausting mode and a circulation mode, and other program modules. Wherein, monitoring module includes pressure sensor, water concentration analyzer, oxygen concentration analyzer for box environmental status monitoring provides safe and reliable, effectual index information for control module 10's integrated control, guarantees that sealed box 1 is in safe malleation state all the time and establishes the airflow flow field of different forms and accelerate the oxygen process of removing according to the box water oxygen concentration. The water and oxygen removing purification module 4 is provided with a purification column unit filled with water and oxygen removing materials and a connecting valve.
Specifically, as shown in fig. 3 and 6, the sealed box 1 is provided with a plurality of air inlets 1A and air outlets 1B. Gas outlet 1B sets up in sealed box 1 top, and gas outlet 1B passes through exhaust pipe and connects except that water oxygen purification module 4 and lead to the atmosphere through exhaust pipe, and wherein exhaust pipe arranges to atmospheric output and the input of connecting except that water oxygen purification module 4 is equipped with first valve 6, second valve 7 respectively, and the gas that overflows in with sealed box 1 is introduced atmosphere or except that water oxygen purification module 4 through opening and close of controlling first valve 6 and second valve 7. The air inlet 1A is arranged at the bottom of the sealed box body 1, is connected with the water-removing oxygen purification module 4 through an air supply pipeline and is connected with the inert gas charging source 5 through the air supply pipeline, and the air supply pipeline is provided with a third valve 8 for controlling the air exhaust of the water-removing oxygen purification module 4 and a fourth valve 9 for controlling the delivery of the inert gas charging source 5. The air charging and exhausting module 11 is connected with the first valve 6, the second valve 7, the third valve 8 and the fourth valve 9, and the air charging and exhausting module 11 is driven by the control module 10 to integrally control the on-off of the valves.
Selecting two or more longitudinal sections in the width direction of the sealed box body 1, wherein a plurality of internal circulation modules are uniformly distributed on the bottom, the top, the right side wall and the left side wall of the box body correspondingly at each longitudinal section, and the preferred internal circulation module in the embodiment is a fan 2 with an independently adjustable angle for changing the airflow direction; each fan adjusts the deflection angle θ (the included angle between the central axis of the fan and the fixed axis) of the corresponding position under the action of the control module 10, so that gas flow fields corresponding to different forms are established at different stages, as shown in fig. 4 and 5. The internal circulation module can also select other similar mechanical structures which can accelerate the gas flow rate and adjust the steering, such as louvre blades, flow deflectors and the like, and can be arranged on the box wall at intervals and can also be paved on the whole surface; in addition, the internal circulation module can also select the longitudinal section to carry out the circumference and lay in the sealed box body length direction, or divide the longitudinal section in the width direction and lay simultaneously also divide the longitudinal section in the length direction and carry out the circumference and lay.
An arc-shaped air guide sleeve 3 is arranged at the corner of the junction of the adjacent surfaces of the sealed box body 1, as shown in figures 6 and 10; specifically, the arc-shaped air guide sleeve 3 is specifically arranged at four corners of the box body. Through setting up arc kuppe 3 and forming the cambered surface in juncture, can reduce the friction and the collision between the local fluid of corner department to reduce the fluid resistance of gas and the contact of 1 wallboard of sealed box, reduce the speed loss, accelerate fluid speed, avoid local vortex to produce, eliminate the circulation blind spot.
Further, as shown in fig. 3, a skylight 1C is further arranged at the top of the sealed box body 1 for large-scale processing equipment to be hoisted and passed through, a skylight 1C body is hermetically connected through an O-shaped sealing ring, at least 40 sealing press pliers and a necessary mechanical fixing structure, and 4 lifting lugs are further arranged on the skylight 1C for hoisting the skylight 1C. Once the large-scale additive manufacturing equipment in the box body breaks down, the large-scale parts can be lifted out for inspection and maintenance work by opening the skylight 1C, and the maintainability of the additive manufacturing equipment is improved.
The front end of the sealing box body 1 is provided with a pneumatic sealing door 1D, processing parts are put in or taken out from the sealing door 1D, and a sealing door body is in sealing connection through an O-shaped sealing ring, a sealing cylinder and a necessary mechanical fixing structure; the sealing cylinder is equally divided into four groups, and is respectively arranged around the upper, lower, left and right sides of the sealing door 1D, and when the sealing door 1D is closed, the four groups of cylinders are pushed up tightly and sequentially: upside-left-right-underside; when the sealing door 1D is opened, the four groups of cylinders are released simultaneously. Like this closing sealing door 1D's in-process, avoided the cylinder to compress tightly the sealing door 1D that the time discordance caused and rock and seal badly, guaranteed sealing door 1D and the complete compaction of box, strengthened the reliability of pneumatic sealing door 1D switching, reduced sealing door 1D gas leakage hidden danger.
According to the atmosphere protection device provided by the embodiment, inert gas is continuously fed through the air inlet 1A, the inert gas is upwards gathered from the bottom of the sealed box body 1 by utilizing the characteristic that the density of the inert gas is greater than that of air, and most of air is extruded out of the box body through the air outlet 1B; when the sealed box body 1 is basically filled with inert gas, the control module 10 drives the internal circulation module to adjust the gas flow field form in the sealed box body 1, the sequential state of the gas displacement from bottom to top is disturbed, the inert gas with high density at the bottom of the sealed box body 1 circularly flows around the space and is fully mixed with a small amount of local air and water and oxygen which are difficult to displace at corners, so that the mixed gas is continuously discharged, and the concentration of the inert gas in the box body is gradually improved along with the circulation until the processing requirement is met.
Example 2
Based on embodiment 1, this embodiment provides a method for removing water and oxygen by an atmosphere protection device, as shown in fig. 6 to 9, comprising the following steps:
s1, standing and replacing a drainage oxygen stage: the initial state is switched to an inflation and exhaust mode, an inflation valve and an exhaust valve are opened, 99.9% high-purity inert gas is gradually filled into the sealed box body 1, the interior of the sealed box body 1 is kept in a positive pressure state (6 mbar over atmospheric pressure), the gas in the sealed box body 1 can be automatically exhausted upwards through the air outlet 1B, a unidirectional flow field airflow organization which is delivered downwards and discharged upwards is formed, and the air in the box body is gradually replaced by the inert gas, as shown in fig. 7. In the step, the first valve 6 and the fourth valve 9 are opened through the charging and discharging module 11, the second valve 7 and the third valve 8 are closed, and overflowed air is directly introduced into the atmosphere.
S2, circularly replacing a drainage oxygen stage: when the oxygen concentration in the sealed box body 1 is reduced to a first set value (preferably a set value of 100000 ppm), maintaining an air charging and exhausting mode, continuously charging 99.999% of high-purity inert gas into the sealed box body 1, and keeping the interior of the box body in a positive pressure state; starting the fan 2, adjusting the deflection angle theta of the fan 2 at different positions, and establishing a unidirectional circulation flow field airflow structure which is sent from bottom to top, as shown in fig. 8. Specifically, the deflection angle of the fan 2 arranged at the bottom of the box body is 90 degrees, the wind direction is horizontally towards the right at the moment, the deflection angle of the fan 2 on the right side wall of the box body is 0 degree, and the wind direction is vertically upwards at the moment; the deflection angle of the fan 2 at the top of the box body is minus 90 degrees, and the wind direction is horizontal to the left at the moment; the fan on the left side wall of the box body deflects by 180 degrees, and the wind direction is vertical downward at the moment, so that a counterclockwise one-way circulating air flow organization form is formed on the longitudinal section of the internal space of the sealed box body.
On one hand, high-purity inert gas is fully mixed with a small amount of air under the action of circulating airflow, gradually takes away local water and oxygen at the corner position difficult to replace, and is discharged out of the sealed box body 1 along with circulation; on the other hand, the high-purity inert gas (99.999%) is fully mixed with the inert gas with the original purity of 99.9% in the box body, and the concentration of the inert gas in the box body is gradually increased along with the circulation. In this step, the present embodiment preferably maintains the open state of the first valve 6 and the fourth valve 9, and maintains the closed state of the second valve 7 and the third valve 8.
S3, stirring, circulating, water removing and oxygen removing stage: when the oxygen concentration in the sealed box body 1 is reduced to a second set value (preferably, the set value is 400 ppm), driving the air charging and discharging module 11 to close the first valve 6, opening the second valve 7 and the third valve 8 (the fourth valve 9 of the inert gas charging source 5 can be closed and opened according to requirements), and switching to an internal circulation mode (the inside of the sealed box body 1, an exhaust pipeline and an air supply pipeline are constructed to form a circulation); meanwhile, the control module 10 adjusts the fans 2 at different positions to corresponding proper angles, and a diffusion flow field airflow structure which is sent from bottom to top is established, as shown in fig. 9. Specifically, a central axis of a longitudinal section of the sealed box body in the figure is taken as a boundary, a left fan at the bottom of the box body deflects by an angle of minus 90 degrees, and the wind direction is horizontal to the left at the moment; the deflection angle of a fan at the lowest end of the left side wall of the box body is minus 45 degrees, and the wind direction is 45 degrees along the upper left direction at the moment; the deflection angle of the uppermost fan on the left side wall of the box body is 45 degrees, and the wind direction is 45 degrees along the upper right at the moment; the left side wall fan (not shown) in the other middle part deflects by an angle of 0 degrees, and the wind direction is vertically upward; the left side of the top of the box body is close to the fan of the central axis of the box body, the deflection angle of the fan is 180 degrees, and the wind direction is vertical downwards at the moment; the deflection angles of the rest fans on the left side of the top of the box body are all 90 degrees, and the wind direction is horizontally towards the right; finally, a clockwise circulating air flow organization is formed on the left side of the box body. Correspondingly, the central axis of the longitudinal section of the sealed box body in the figure is taken as a boundary, the deflection angle of the fan on the right side of the bottom of the box body is 90 degrees, and the wind direction is horizontally towards the right; the deflection angle of a fan at the lowest end of the right side wall of the box body is 45 degrees, and the wind direction is 45 degrees along the upper right direction at the moment; the deflection angle of the uppermost fan on the right side wall of the box body is minus 45 degrees, and the wind direction is 45 degrees along the upper left direction at the moment; the deflection angle of the fans (not shown) in the middle of the other right side walls is 180 degrees, and the wind direction is vertical and upward; the deflection angle of the fan which is positioned at the right side of the top of the box body and is close to the central axis of the box body is 180 degrees, and the wind direction is vertical downwards at the moment; the deflection angles of the rest fans on the right side of the top of the box body are minus 90 degrees, and the wind direction is horizontal to the left at the moment; and finally, forming a counterclockwise circulating airflow structure on the right side of the box body, thereby forming a dual-circulating diffusion flow field airflow structure on the longitudinal section of the internal space of the sealed box body. The air flow organization of the diffusion flow field can also be reversed, namely, the left side of the box body circulates anticlockwise, and the right side of the box body circulates clockwise.
The establishment of the diffusion flow field airflow structure which is sent from bottom to top is beneficial to further and fully mixing the gas in the box body, and the elimination of local circulation dead angles. The gas in the sealed box body 1 is purified by removing residual water and oxygen in the inert gas through the water and oxygen removing purification module 4, and then is recycled to the establishment of the inert atmosphere, so that the consumption of the inert gas is reduced, and the economic cost is reduced; in addition, after the oxygen concentration is reduced to the second set value of 400ppm through the step S2, internal circulation is performed to remove water and oxygen, so that the service life of the purifying material is prolonged, the regeneration frequency of the purifying material is reduced, and the use cost is saved.
And S4, when the oxygen concentration in the sealed box body 1 is reduced to a third set value (preferably, the set value is 50 ppm), the requirement of the processing environment is met, the fan 2 is closed, and the establishment operation of the inert atmosphere protection environment is completed.
In this example, water and oxygen were removed based on the above atmosphere protection device, and it took 3 hours for the air state of the gas in the tank to fall to 400ppm oxygen content, 1 hour for the 400ppm oxygen content to fall to 50ppm oxygen content, and 4 bottles for the total gas consumption. The method for removing water and oxygen provided by the embodiment is beneficial to removing a circulation dead zone, reduces the difficulty of water and oxygen replacement at a dead angle, effectively reduces the consumption of inert gas while accelerating the establishment speed of the inert atmosphere, prolongs the service life of the purification material of the water and oxygen removal purification module 4, and reduces the economic cost.
Comparative example
Comparative example 1: compared with the embodiment 2, only the arc-shaped guide cover is removed, and the inert atmosphere protection environment is established according to the method for removing the water and the oxygen provided by the embodiment 1.
Comparative example 2: compared with the embodiment 2, the stirring circulating water and oxygen removing stage is omitted after the standing displacement drainage oxygen stage, namely the circulating displacement drainage oxygen stage, and the internal circulating water and oxygen removing mode is started in the circulating displacement drainage oxygen stage. Namely, when the oxygen concentration in the sealed box body is reduced to be below 100000ppm of a first set value, 99.999 percent of high-purity inert gas is continuously filled into the sealed box body 1, so that the interior of the box body is kept in a positive pressure state, and a unidirectional circulation flow field airflow organization is constructed by adjusting the blowing direction of each internal circulation module; at the same time, the first valve 6 and the fourth valve 9 are closed, and the second valve 7 and the third valve 8 are opened to switch to the internal circulation mode. And finishing the water and oxygen removal work under the inert atmosphere protection environment until the oxygen concentration in the sealed box body is reduced to 50ppm of the third set value of the oxygen concentration.
Comparative example 3: compared with the embodiment 2, after the drainage oxygen stage is replaced by standing, the cyclic replacement drainage oxygen stage is omitted, when the oxygen concentration in the sealed box body is reduced to be below 100000ppm of the first set value, a diffusion flow field airflow organization is constructed and enters the stirring cyclic dehydration oxygen stage, meanwhile, the internal circulation mode is switched, gas exhausted from the water outlet is filtered by the dehydration oxygen purification module and then is sent into the sealed box body again, and when the oxygen concentration in the sealed box body is reduced to be 50ppm of the third set value of the oxygen concentration, the inert atmosphere protection environment dehydration oxygen work is completed.
The working times and the inert gas (argon) usage of the examples and comparative examples were compared, and the statistical results are shown in table 1 below:
according to the experiments of removing water and oxygen in the embodiment and the comparative example 1, the arc-shaped flow guide cover is arranged in the sealed box body, so that the generation of a circulation dead zone is avoided, and the gas replacement efficiency is accelerated.
According to the water and oxygen removal tests of the comparative example 2 and the comparative example 3, compared with the diffusion flow field gas flow structure form, the one-way circulation flow field gas flow structure form has better effects on improving the mixing degree of the inert gas and the main residual water and oxygen and accelerating the discharge, and is more favorable for reducing the water and oxygen replacement difficulty in the early stage and reducing the consumption of the inert gas.
Compared with the method for replacing gas by only establishing a one-way circulating flow field gas flow organization or a diffusion flow field gas flow organization, the method improves the uniform mixing degree between the inert gas and the residual water oxygen by establishing the one-way circulating flow field and accelerates the discharge, accelerates the replacement process of the high-purity inert gas and the original-purity inert gas by establishing the diffusion flow field, and recycles the discharged inert gas after removing water and oxygen by establishing a circulating passage in the exhaust process of utilizing the diffusion flow field. Therefore, the argon consumption can be reduced to a great extent, the gas replacement effect at a high speed is kept, the water and oxygen removal process is accelerated, and the economic cost is saved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A method for removing water and oxygen from an atmosphere protection device is characterized by comprising the following steps:
filling inert gas with first preset purity into the sealed box body (1), wherein the gas in the sealed box body (1) can be upwards discharged through the gas outlet (1B) to form a unidirectional flow field gas flow organization which is sent downwards and sent upwards;
when the oxygen concentration in the sealed box body (1) is reduced to be below a first set value, filling inert gas with second preset purity into the sealed box body (1), wherein the second preset purity is higher than the first preset purity; in the inflation process, circumferential circulating airflow is formed on the longitudinal section along the inner wall of the sealed box body (1), the gas in the sealed box body (1) can still be discharged upwards through the gas outlet (1B),
until the water concentration and the oxygen concentration in the sealed box body (1) meet the processing requirements.
2. The method for removing water and oxygen by an atmosphere protecting device according to claim 1, wherein the gas outlet (1B) is communicated with the atmosphere in the exhaust stage of the process of filling the inert gas with the first preset purity; and in the exhaust stage of the process of filling the second preset-purity inert gas, blocking the air outlet (1B) from being communicated with the atmosphere, communicating the air outlet (1B) with the air supply port of the water-removing oxygen purification module (4), and communicating the exhaust port of the water-removing oxygen purification module (4) with the air inlet (1A) of the sealed box body (1).
3. The method for removing water and oxygen by an atmosphere protecting device according to claim 2, wherein during the process of filling the inert gas with the second preset purity, a unidirectional circulation flow field gas flow structure is firstly constructed on the longitudinal section along the inner wall of the sealed box body (1), and a diffusion flow field gas flow structure is constructed when the oxygen concentration in the sealed box body (1) is reduced to be lower than a second set value.
4. The method for removing water and oxygen by an atmosphere protection device according to claim 3, wherein when the oxygen concentration in the sealed box body (1) is reduced to be below a second set value, the air outlet (1B) is switched from a state of being communicated with the atmosphere to a state of being communicated with the water and oxygen removal purification module (4), and a circulation path is constructed between the air inlet (1A) and the air outlet (1B).
5. An atmosphere protection device, in which a method for removing water and oxygen by using the atmosphere protection device as claimed in any one of claims 1 to 4 is applied, comprising a sealed box body (1) and a plurality of internal circulation modules, wherein the bottom of the sealed box body (1) is provided with an air inlet (1A), the top of the sealed box body is provided with an air outlet (1B), the internal circulation modules are circumferentially arranged on a longitudinal section along the inner wall of the sealed box body (1), and the internal circulation modules can change the flow direction of air flow by adjusting the offset angle of the internal circulation modules.
6. An atmosphere protection device for additive manufacturing according to claim 5, wherein adjacent surfaces of the sealed box (1) are connected by a cambered transition.
7. An atmosphere protection device for additive manufacturing according to claim 5, further comprising a water removal oxygen purification module (4), wherein the air inlet of the water removal oxygen purification module (4) is connected to the air outlet (1B), and the air outlet of the water removal oxygen purification module (4) is communicated with the air inlet (1A).
8. The atmosphere protection device for additive manufacturing according to claim 7, wherein the gas outlet (1B) is connected with the dehydrated oxygen purification module (4) through the gas exhaust pipeline and discharges gas through the gas exhaust pipeline, the gas inlet (1A) is connected with the dehydrated oxygen purification module (4) through the gas supply pipeline and is connected with the inert gas charging source (5) through the gas supply pipeline, valves are arranged at the gas supply port and the gas exhaust port of the dehydrated oxygen purification module (4) and at the gas exhaust port of the gas exhaust pipeline and the gas charging port of the inert gas charging source (5), each valve can be switched to be in an on-off state through a gas charging and discharging module (11), and the gas charging and discharging module (11) is connected with the control module (10).
9. An atmosphere protection device for additive manufacturing according to any of claims 1-8, wherein the sealed box (1) is provided with a skylight (1C).
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