CN215879905U

CN215879905U - Atmosphere purification system

Info

Publication number: CN215879905U
Application number: CN202023288442.0U
Authority: CN
Inventors: 刘凯; 陈马龙; 姜军
Original assignee: Zhejiang Top Environmental Technology Co ltd
Current assignee: Zhejiang Top Environmental Technology Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-02-22
Anticipated expiration: 2030-12-30

Abstract

The application relates to an atmosphere purification system, which comprises a filter assembly, wherein the filter assembly is connected with a 3D printer through an air suction pipeline and an air blowing pipeline to form a filtering and purifying circulation loop; the connection end of the air suction pipeline and the 3D printer is provided with an air suction control valve, the connection end of the air blowing pipeline and the 3D printer is provided with an air blowing control valve, the air suction pipeline and the air blowing pipeline are connected through a connecting pipeline, the filtering assembly is connected with an inert gas source through an air inlet pipeline, and the connecting pipeline is provided with a connecting pipeline control valve. Atmosphere circulating filtration is adopted as a dust removal auxiliary device of the metal 3D printing equipment, smoke in the 3D printing equipment is taken away quickly, the smoke is isolated through the air inlet end filtering device, and cleaned gas is returned to the forming cavity to form a stable circulating process.

Description

Atmosphere purification system

Technical Field

The utility model belongs to the field of printing equipment, relates to 3D printing equipment, and particularly relates to an atmosphere purification system.

Background

At present, the mainstream technology of metal 3D printing is to melt and mold powder by using laser as an energy source. When metal powder is melted by laser, smoke dust is generated, if the metal powder cannot be processed in time, the smoke dust can be attached to a forming cavity under the disturbance of hot air flow or diffuse on a laser forming surface, so that the pollution of a forming area is caused, the precision of metal 3D printing and the quality of a workpiece are reduced, the penetration force of the laser is influenced by excessive smoke dust, the sintering capacity of a 3D printer is reduced, a laser system protective mirror surface can be covered, and a lens is burnt. Because the inside of the metal 3D printer forming chamber is usually filled with inert gas, the metal powder is prevented from being oxidized and forming a dust explosion environment, the inert gas is high in cost, if the smoke dust in the forming chamber is directly exhausted into the atmosphere, the inert gas needs to be continuously supplemented at the same time, the inert gas environment in the forming chamber can be ensured, however, the waste of the inert gas is caused, and the cost of 3D printing is improved.

The so-called soot contains not only the fumes produced by laser sintering, but also unreacted metal powder, including even some large solidified particulate matter. Whatever the components, the chemical activity and the residual energy of the components are extremely high, so that the trapped smoke dust is inflammable and explosive, and the substances are extremely easy to combust or explode when contacting with the outside air, so that the smoke dust is very dangerous. It is necessary to perform atmosphere circulating filtration on the metal 3D printing and forming chamber and reuse inert gas.

Disclosure of Invention

The object of the present application is to address the above problems, providing an atmosphere purification system;

in order to achieve the purpose, the utility model adopts the following technical scheme:

the application creatively provides an atmosphere purification system, which comprises a filter assembly, wherein the filter assembly is connected with a 3D printer through an air suction pipeline and an air blowing pipeline to form a filter purification circulation loop;

the connection end of the air suction pipeline and the 3D printer is provided with an air suction control valve, the connection end of the air blowing pipeline and the 3D printer is provided with an air blowing control valve, the air suction pipeline and the air blowing pipeline are connected through a connecting pipeline, the filtering assembly is connected with an inert gas source through an air inlet pipeline, and the connecting pipeline is provided with a connecting pipeline control valve.

In the above atmosphere purification system, the filter assembly includes a first filter, a second filter and a third filter sequentially arranged along the gas path direction; the first filter is a cyclone separator, the second filter is a high-medium efficiency filter, and the third filter is a high-efficiency filter.

In the above-mentioned atmosphere purification system, a plurality of secondary filters are connected in parallel between the primary filter and the tertiary filter, and the upstream end and the downstream end of each secondary filter are provided with a primary filtration control valve.

In the above-mentioned atmosphere purification system, the outlet side of each secondary filter is correspondingly connected with a back-blowing air bag, and each back-blowing air bag is connected with an inert gas source.

In an above-mentioned atmosphere clean system, still include printer purge passageway, this printer purge passageway includes the second exhaust passage who connects the printer purge line of connecting inert gas source and 3D printer and connecting 3D printer.

In the above atmosphere purification system, an air inlet valve is arranged on the air inlet pipeline, a first exhaust valve is arranged on the first exhaust channel, a fan, an oxygen content sensor and a pressure sensor are arranged at the outlet end of the filter assembly, the oxygen content sensor is in signal connection with the air inlet valve, and the pressure sensor is in signal connection with the first exhaust valve.

In the atmosphere purification system, the first exhaust passage is connected to the atmosphere through a first exhaust filter device, and a first exhaust valve is arranged on the first exhaust passage;

the second exhaust channel is connected with the atmosphere through a second exhaust filtering device, and a second exhaust valve is arranged on the second exhaust channel.

In the above atmosphere purification system, the upstream end of the tertiary filter is connected to a third exhaust passage, and a third exhaust valve is provided on the third exhaust passage.

In one of the above atmosphere purification systems, the first exhaust passage is connected to a downstream end of the blower.

In one of the above atmosphere purification systems, the air intake line is connected to the air intake line.

Compared with the prior art, the utility model has the advantages that:

1) atmosphere loop filter is adopted as the dust removal auxiliary device of metal 3D printing apparatus, takes away the smoke and dust in the 3D printing apparatus fast to through keeping apart the smoke and dust with filtering component, return the gaseous shaping cavity of 3D printing apparatus after the cleaning, form stable cyclic process.

2) The whole process is protected by inert gas, so that the powder is prevented from being oxidized, the powder quality is ensured, and the dust explosion risk can be prevented.

3) To the condition that different compositions and smoke and dust particle diameter differ, adopt tertiary the filtration to carry out the powder and filter, adopt different explosion-proof treatment measures to the different dust material of dangerous grade of collecting simultaneously, promoted the life of filter core, reduced the change frequency of filter core.

4) Can provide real-time supervision through oxygen content sensor and pressure sensor, guarantee that the oxygen content keeps at low concentration in the system, the pressure value remains stable.

Drawings

Fig. 1 is a block diagram provided herein.

Fig. 2 is a diagram of a pipeline architecture as provided herein.

In the figure, an air suction line 11, an air suction control valve 110, an air blowing line 12, an air blowing control valve 120, a connecting line 13, a connecting line control valve 130, a first exhaust passage 14, a first exhaust valve 140, an air inlet line 15, an air inlet valve 150, a printer purge line 16, a second exhaust passage 17, a filter assembly 2, a fan 201, an oxygen content sensor 202, a pressure sensor 203, a primary filter 21, a secondary filter 22, a tertiary filter 23, a 3D printer 3, and an inert gas source 4.

Detailed Description

Further illustrated by the following specific examples;

as shown in fig. 1 and 2, an atmosphere purification system comprises a filter assembly 2, the filter assembly 2 is connected with a 3D printer 3 through an air suction pipeline 11 and an air blowing pipeline 12 to form a dust removal circulation loop, an air suction control valve 110 is arranged at the connection end of the air suction pipeline 11 and the 3D printer 3, an air blowing control valve 120 is arranged at the connection end of the air blowing pipeline 12 and the 3D printer 3, the air suction pipeline 11 and the air blowing pipeline 12 are connected through a connection pipeline 13, the filter assembly 2 is connected with an inert gas source 4 through an air inlet pipeline 15, and a connection pipeline control valve 130 is arranged on the connection pipeline 13.

Atmosphere loop filter is adopted as the dust removal auxiliary device of metal 3D printing apparatus, takes away the smoke and dust in the 3D printing apparatus fast to through keeping apart the smoke and dust with filtering component, return the gaseous shaping cavity of 3D printing apparatus after the cleaning, form stable cyclic process.

Also included in the atmosphere purification system is a printer purge path that includes a printer purge line 16 connecting the inert gas source 4 and the 3D printer 3, and a second exhaust channel 17 connecting the 3D printer 3. The printer air purge line 16 is provided with a printer air purge valve 160 for purging the printer to exhaust air from the printer, so that the system is filled with inert gas to prevent oxidation of the powder.

The first exhaust passage 14 is connected with the atmosphere through a first exhaust filtering device 51, and a first exhaust valve 140 is arranged on the first exhaust passage 14; the second exhaust passage 17 is connected to the atmosphere through a second exhaust filter device 52, and a second exhaust valve 170 is provided on the second exhaust passage 17. The exhaust gas is filtered to protect the environment.

The filtering component 2 comprises a primary filter 21, a secondary filter 22 and a tertiary filter 23 which are arranged in sequence along the air path direction.

Specifically, the primary filter 21 is preferably a cyclone, and filters large particle dust. The second-stage filter 22 is preferably a high-efficiency and medium-efficiency filter, and can be an F9-stage filter, so that the smoke dust with the particle size of more than or equal to 1.0 mu m can be filtered, and the filtering efficiency is 90-99%. The third filter 23 is preferably a high-efficiency filter, and can be an H13 grade filter, and can filter smoke dust with the grain size of more than or equal to 0.5 μm, and the filtering efficiency is more than or equal to 99.99%.

A plurality of secondary filters 22 are connected in parallel between the primary filter 21 and the tertiary filter 23, a primary filtration control valve 220 is provided at each of the upstream and downstream ends of each secondary filter 22, and a differential pressure sensor 221 is provided at each of the upstream and downstream ends of each secondary filter 22.

In one embodiment, four secondary filters 22 are connected in parallel between the primary filter 21 and the tertiary filter 23, wherein the primary filter control valves 220 at the upstream end and the downstream end of three secondary filters 22 are opened during the dust removal process, the primary filter control valve 220 at the upstream end and the downstream end of another secondary filter 22 is closed for standby, when the pressure difference sensor 221 at the upstream end and the downstream end of one secondary filter 22 monitors that the pressure difference exceeds a set value, the standby secondary filter 22 is started to ensure the stable dust removal, and online non-stop replacement can be realized, so that the printing efficiency is improved, the cleaning is convenient, the interchangeability is improved, and the use cost is also reduced.

The outlet side of each secondary filter 22 is correspondingly connected with a back-blowing air bag 24, and each back-blowing air bag 24 is connected with the inert gas source 4. And the rough filtration filter element is reversely blown and swept, so that the filter element replacement frequency is reduced, and the working efficiency is improved.

An air inlet valve 150 is arranged on the air inlet pipeline 15, a first exhaust valve 140 is arranged on the first exhaust channel 14, a fan 201, an oxygen content sensor 202 and a pressure sensor 203 are arranged at the outlet end of the filter assembly 2, and the oxygen content sensor 202 is in signal connection with the air inlet valve 150. The pressure sensor 203 is in signal connection with the first exhaust valve 140 on the first exhaust passage 14. Oxygen sensor 202 can be used to detect the oxygen level in the system and generate an open signal to intake valve 150 to provide inert gas input when the oxygen level is above a set point. The pressure sensor 203 can be used to detect the pressure value in the system, and when the pressure is higher than the set value, the pressure sensor generates an opening signal to the first exhaust valve 140 to exhaust, thereby improving the safety performance.

The first exhaust passage 14 is connected to the downstream end of the blower 201. The intake line 15 is connected to the suction line 11. The air path air washing passage can form an air washing passage under the action of the fan 201, and the filter assembly 2 is fully cleaned.

The connecting pipeline 13 connects the air suction pipeline 11 and the air blowing pipeline 12, so that the air suction pipeline 11, the filter assembly 2, the air blowing pipeline 12 and the connecting pipeline 13 form a washing loop, and the washing step of the filter assembly 2 is independently realized.

The valves such as the suction control valve 110, the blowing control valve 120, the connecting line control valve 130, the first exhaust valve 140, the intake valve 150, the printer purge valve 160, the second exhaust valve 170, and the primary filter control valve 220 may be pinch valves, ball valves, butterfly valves, solenoid valves, or other valves.

An atmosphere purification method based on the system comprises the following steps:

s1 purge

The method comprises a filtering component and pipeline gas washing step and a printer gas washing step, wherein the two steps can be carried out simultaneously or respectively.

The method for independently washing the gas by the filtering component and the pipeline comprises the following steps: the connecting line control valve 130, the air intake valve 150 and the first exhaust valve 140 are connected, the air intake control valve 110 and the air blowing control valve 120 are closed, the filter assembly 2 and the air intake line 11 and the air blowing line 12 connected thereto are charged with inert gas to exhaust air, and the charging is stopped until the oxygen content of the oxygen content sensor 202 is lower than a set value. The oxygen content set value is 0.05-1% VOL.

The method for independently washing the gas of the printer comprises the following steps: the printer purge valve 160 and the second purge valve 170 are turned on, and the 3D printer 3 is inflated by the inert gas to discharge the air.

The method for simultaneously washing the filter assembly 2 and the 3D printer 3 comprises the following steps: the connecting line control valve 130, the intake valve 150, the first exhaust valve 140, the suction control valve 110, the blowing control valve 120, the printer purge valve 160, and the second exhaust valve 170 are turned on, while the filter assembly 2 and the 3D printer 3 are inflated to exhaust air until the oxygen content of the oxygen content sensor 202 is lower than the set value. The oxygen content set value is 0.05-1% VOL.

S2 circulating filtration and purification step

Closing the connecting pipeline control valve 130, the air inlet valve 150 and the first exhaust valve 140, connecting the suction control valve 110 and the blowing control valve 120, sucking the atmosphere in the 3D printer 3 into the filter assembly 2 through the suction pipeline 11, and performing smoke and dust removal treatment, wherein the smoke and dust removal treatment comprises the following steps;

s21 first stage filtration

The atmosphere is subjected to primary filtration by a primary filter 21 to filter large particle dust.

S21 two-stage filtration

And (3) performing secondary filtration on the gas subjected to the primary filtration in a secondary filter 22, wherein the filtration efficiency is 90-99%.

S22 three-stage filtration

And the gas after the second-stage filtration is subjected to third-stage filtration in a third-stage filter 23, and the filtration efficiency is more than or equal to 99.99%.

The obtained clean gas is sent back to the 3D printer 3 through the blowing pipeline 12 under the action of the blower 201 to complete one-time circular filtration and purification.

In the circulation filtration purification step S2, when the oxygen content sensor 202 in the filtration purification circulation loop detects that the oxygen content is higher than the set value, the inert gas filling is resumed, and when the oxygen content sensor 202 in the filtration purification circulation loop detects that the oxygen content is lower than the set value, the inert gas filling is stopped. The oxygen content set value is 0.05-1% VOL.

In the circulation filtration purification step S2, when the pressure sensor 203 in the filtration purification circulation circuit detects that the gas pressure is higher than the set value, the first exhaust passage 14 is opened to perform exhaust, and when the pressure sensor 203 in the filtration purification circulation circuit detects that the gas pressure is lower than the set value, the first exhaust passage 14 is closed to stop exhaust. The pressure set point should be set according to the safety pressure required by the equipment.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Although the terms of the suction line 11, the suction control valve 110, the blowing line 12, the blowing control valve 120, the connecting line 13, the first exhaust passage 14, the first exhaust valve 140, the air inlet line 15, the air inlet valve 150, the printer purge line 16, the second exhaust passage 17, the filter assembly 2, the blower 201, the oxygen content sensor 202, the pressure sensor 203, the primary filter 21, the secondary filter 22, the tertiary filter 23, the 3D printer 3, the inert gas source 4, and the like are used more extensively herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and they are to be interpreted as any additional limitation which is not in accordance with the spirit of the present invention.

Claims

1. An atmosphere purification system, characterized by: the device comprises a filtering component (2), wherein the filtering component (2) is connected with a 3D printer (3) through an air suction pipeline (11) and an air blowing pipeline (12) to form a filtering and purifying circulation loop;

the connecting end of the air suction pipeline (11) and the 3D printer (3) is provided with an air suction control valve (110), the connecting end of the air blowing pipeline (12) and the 3D printer (3) is provided with an air blowing control valve (120), the air suction pipeline (11) and the air blowing pipeline (12) are connected through a connecting pipeline (13), the filtering assembly (2) is connected with an inert gas source (4) through an air inlet pipeline (15), and the connecting pipeline (13) is provided with a connecting pipeline control valve (130).

2. The atmosphere purification system according to claim 1, wherein: the filtering component (2) comprises a primary filter (21), a secondary filter (22) and a tertiary filter (23) which are sequentially arranged along the gas path direction; the first-stage filter (21) is a cyclone separator, the second-stage filter (22) is a high-efficiency and medium-efficiency filter, and the third-stage filter (23) is a high-efficiency filter.

3. The atmosphere purification system according to claim 2, wherein: a plurality of secondary filters (22) are connected in parallel between the primary filter (21) and the tertiary filter (23), and the upstream end and the downstream end of each secondary filter (22) are respectively provided with a primary filtering control valve (220).

4. The atmosphere purification system according to claim 3, wherein: the outlet side of each secondary filter (22) is correspondingly connected with a back-blowing air bag (24), and each back-blowing air bag (24) is connected with an inert gas source (4).

5. The atmosphere purification system according to claim 1, wherein: still include printer purge passageway, this printer purge passageway is including connecting inert gas source (4) and 3D printer (3) printer purge line (16) and second exhaust passage (17) of connecting 3D printer (3).

6. The atmosphere purification system according to claim 5, wherein: be equipped with admission valve (150) on air inlet pipeline (15), the exit end of filter assembly (2) is equipped with fan (201), oxygen content sensor (202) and pressure sensor (203), oxygen content sensor (202) and admission valve (150) signal connection, pressure sensor (203) and first exhaust valve (140) signal connection, first exhaust passage (14) are connected in the low reaches end of fan (201), are equipped with first exhaust valve (140) on first exhaust passage (14).

7. The atmosphere purification system according to claim 6, wherein: the first exhaust channel (14) is connected with the atmosphere through a first exhaust filtering device (51), and a first exhaust valve (140) is arranged on the first exhaust channel (14);

the second exhaust channel (17) is connected with the atmosphere through a second exhaust filtering device (52), and a second exhaust valve (170) is arranged on the second exhaust channel (17).

8. The atmosphere purification system according to claim 2, wherein: the upstream end of the three-stage filter (23) is connected with a third exhaust channel (18), and a third exhaust valve (180) is arranged on the third exhaust channel (18).

9. The atmosphere purification system according to claim 1, wherein: the air inlet pipeline (15) is connected to the air suction pipeline (11).