CN113413688A - Double-filter-element dust removal system applied to small 3D printer and control method thereof - Google Patents
Double-filter-element dust removal system applied to small 3D printer and control method thereof Download PDFInfo
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- CN113413688A CN113413688A CN202110676811.3A CN202110676811A CN113413688A CN 113413688 A CN113413688 A CN 113413688A CN 202110676811 A CN202110676811 A CN 202110676811A CN 113413688 A CN113413688 A CN 113413688A
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- 238000000034 method Methods 0.000 title claims description 17
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 239000000779 smoke Substances 0.000 claims abstract description 44
- 239000002245 particle Substances 0.000 claims abstract description 25
- 239000004071 soot Substances 0.000 claims abstract description 20
- 230000009977 dual effect Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 43
- 239000000523 sample Substances 0.000 claims description 11
- 238000004134 energy conservation Methods 0.000 abstract description 2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2411—Filter cartridges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/446—Auxiliary equipment or operation thereof controlling filtration by pressure measuring
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a double-filter-element dust removal system applied to a small 3D printer, which comprises a large-particle smoke dust filter and a double-filter-element smoke dust filter which are sequentially connected; one end of the large-particle smoke dust filter is connected with the 3D printer forming chamber and used for filtering large-particle smoke dust in smoke-containing gas, and the other end of the large-particle smoke dust filter is connected with the double-filter-element smoke dust filter; the dual-filter-element soot filter comprises: the double-filter-element filter cartridge comprises a double-filter-element filter cartridge body, an air inlet pipe and an exhaust pipe, wherein two filter cartridge cavities which are mutually separated are arranged in the double-filter-element filter cartridge body, the upper ends of the two filter cartridge cavities are respectively provided with an exhaust chamber, and a filter element is respectively arranged in the two filter cartridge cavities. The dual core soot filter has a plurality of switchable filter modes. Compared with the prior art, the dust removal system disclosed by the invention can adapt to more working conditions, is more flexible and convenient to use, and can achieve the purposes of energy conservation and emission reduction while ensuring the dust removal efficiency.
Description
Technical Field
The invention relates to the technical field of 3D printing, in particular to a double-filter-element dust removal system applied to a small 3D printer and a control method thereof.
Background
3D printing or additive manufacturing is a technique for building three-dimensional objects from CAD models or digital 3D models. "3D printing" can take many forms, the most common of which is the deposition, bonding or curing of materials under computer control to form a three-dimensional object, most typically by superimposing the materials layer by layer. The principle of the SLS is that a laser beam selectively sinters powder materials layer by layer according to layered cross section information, and redundant powder is removed after all sintering is finished to obtain a manufactured part. A large amount of smoke, volatile matters and atomized matters are often generated in the powder sintering process, and if effective dust removal cannot be performed, the light path of laser is blocked, so that the sintering processing efficiency is influenced, and the product quality is finally reduced. The black powder that the regional powder of printing shaping produced by laser irradiation floats in the shaping jar sky because of high temperature gasification splash among the printing process, if this powder can't get in time to clear away the powder of kicking up and can drop on the shaping face powder, leads to the shaping work piece surface roughness. Also, the materials used in additive manufacturing range widely, from plastics such as nylon, ABS, high density polyethylene, polyethylene terephthalate, etc., to metals such as stainless steel, titanium, aluminum and their alloys, and even gold or silver. Most of the materials are flammable, very small particles (even in the range of nanoparticles) can be generated in the 3D printing process, and if the materials cannot be well dedusted, the materials have the potential safety hazards of explosion, fire and the like which endanger human bodies.
The operating mode in the actual production process is very complicated, even if some of current dust pelletizing system can adopt two filter cores to filter, its filtration mode is single, can not carry out nimble adjustment according to operating condition.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a double-filter-element dust removal system applied to a small-sized 3D printer.
In order to achieve the purpose, the invention provides the following technical scheme:
a double-filter-element dust removal system applied to a small 3D printer comprises a large-particle smoke filter and a double-filter-element smoke filter which are sequentially connected;
one end of the large-particle smoke dust filter is connected with the 3D printer forming chamber and used for filtering large-particle smoke dust in smoke-containing gas, and the other end of the large-particle smoke dust filter is connected with the double-filter-element smoke dust filter;
the dual-filter-element soot filter comprises: the filter comprises a double-filter-element filter cylinder, an air inlet pipe and an air outlet pipe, wherein two filter cylinder cavities which are mutually separated are arranged in the double-filter-element filter cylinder, an air exhaust chamber is arranged at the upper ends of the two filter cylinder cavities respectively, a filter element is arranged in each of the two filter cylinder cavities, one end of each filter element is communicated with the corresponding air exhaust chamber and isolates the corresponding air exhaust chamber from the corresponding filter cylinder cavity, one end of the air inlet pipe is connected with an air exhaust port of the large-particle smoke filter, the other end of the air inlet pipe is connected with the two filter cylinder cavities simultaneously, one end of the air outlet pipe is connected with the two air exhaust chambers simultaneously, and the other end of the air outlet pipe is connected with a return air inlet of a fan;
the dual core soot filter has a plurality of switchable filter modes.
Further, the switching among the multiple switchable filtering modes of the double-filter-element smoke filter is realized through pneumatic valves respectively arranged on the air inlet pipe and the air outlet pipe.
Furthermore, the air inlet pipe and the exhaust pipe are respectively provided with a first pressure detection port for connecting a detection probe of a pressure difference detection device, and the pressure difference between the inside and the outside of the filter element of the whole double-filter-element filter cylinder is detected through the first pressure detection port.
Furthermore, second pressure detection ports for connecting detection probes of a pressure difference detection device are respectively arranged on the side walls of the two filter cylinder cavities and the two exhaust chambers, and the internal and external pressure differences of the filter element in the two filter cylinder cavities are respectively detected through the second pressure detection ports.
Further, the pneumatic valve and the pressure difference detection device are in signal connection with a controller, the controller receives the internal and external pressure difference information of the filter element of the double-filter-element filter cylinder and the internal and external pressure difference information of the filter elements in the two filter cylinder cavities, which are sent by the pressure difference detection device, judges and selects one or more of the multiple switchable filter modes to filter according to working conditions, and sends a selection result to the pneumatic valve through signals to perform corresponding switch operation.
Further, the controller receives the information of the internal and external pressure difference of the filter element of the double-filter-element filter cylinder and the information of the internal and external pressure difference of the filter elements in the two filter cylinder cavities, which are sent by the pressure difference detection device, judges and selects one or more of a plurality of switchable filter modes for filtering according to working conditions, further analyzes the use degree of the two filter elements according to the information of the internal and external pressure difference of the filter elements in the two filter cylinder cavities, and controls the pneumatic valve to adjust the amount of gas introduced into the two filter elements.
Furthermore, the air inlet pipe is a U-shaped pipe, the U-shaped pipe comprises a first communicating section and two first ports connected with the first communicating section, an air inlet is formed in the middle of the first communicating section, the two first ports are respectively communicated with the two filter cylinder cavities, the exhaust pipe is also a U-shaped pipe, the U-shaped pipe comprises a second communicating section and two second ports connected with the second communicating section, an air outlet is formed in the middle of the second communicating section, and the two second ports are respectively communicated with the two exhaust chambers.
Furthermore, the tops of the two exhaust chambers are respectively clamped with an upper cover, and the joint seams are sealed through clamping rings.
According to another aspect of the present invention, there is provided a control method of a dual cartridge dust removal system applied to a small 3D printer, including the steps of:
detecting the internal and external pressure difference information of the filter element of the whole double-filter-element filter cylinder and the independent internal and external pressure difference information of the filter elements in the two filter cylinder cavities;
judging and selecting one or more of the multiple switchable filtering modes for filtering by combining the differential pressure information and the current working condition;
and sending the selection result to the pneumatic valve through a signal to perform corresponding switch operation.
And further, after one or more of the multiple switchable filtering modes are selected for filtering, the using degrees of the two filter elements are further analyzed according to the internal and external pressure difference information of the filter elements in the two filter cylinder cavities, and the pneumatic valve is controlled to adjust the amount of gas introduced into the two filter elements.
The invention has the beneficial effects that:
the dust removal system is suitable for filtering smoke dust of the small 3D printer, and adopts a secondary dust removal system, wherein a primary filter firstly filters large-particle smoke dust to prevent a filter element of a high-efficiency filter from being blocked, a secondary high-efficiency filter adopts a structure of double filter cartridges and double filter elements, the dust removal efficiency is improved, and the structure of the double filter elements can basically meet the smoke dust filtering requirement of the small 3D printer. And two filter cartridge structures can combine the requirement of pressure differential testing result and present operating mode to select to switch single filter core or two filter core filtration modes, when selecting single filter core filtration mode, can switch to another filter core and continue to use after a filter core reaches the filtration limit, has prolonged the live time of filter core and has avoided changing the filter core at the in-process of printing, influences the printing effect to reduce the change frequency of filter core, use manpower sparingly. Still can let in two filter cores according to the different amount of wind of the service life adjustment of filter core under two filter core filtration modes, improve the utilization ratio of two filter cores. The filter not only can adapt to more working conditions, is more flexible and convenient to use, but also can achieve the purposes of energy conservation and emission reduction while ensuring the dust removal efficiency.
Drawings
Fig. 1 is a schematic diagram of an air path circulation according to an embodiment of the invention.
Fig. 2 is a schematic diagram of signal transmission according to an embodiment of the invention.
Fig. 3 is a schematic diagram of signal transmission according to another embodiment of the present invention.
FIG. 4 is a partial cross-sectional view of a dual cartridge soot filter in accordance with an embodiment of the present invention wherein the cross-sectional cartridge chamber top cover and clamp ring are not shown.
FIG. 5 is a plan view of the inlet side of a dual core soot filter in accordance with one embodiment of the present invention.
FIG. 6 is a plan view of the exhaust side of a dual core soot filter in accordance with one embodiment of the present invention.
FIG. 7 is a front view of a large particle soot filter in accordance with an embodiment of the present invention.
FIG. 8 is a cross-sectional view of a large particle soot filter in accordance with an embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", "one face", "the other face", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed", "connected", and the like are to be construed broadly, such as "connected", may be fixedly connected, or detachably connected or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meanings of the above terms in the present invention can be specifically understood in specific cases by those of ordinary skill in the art.
The present invention will be described in detail with reference to the following examples.
Referring to fig. 1-8, a dual-filter-element dust removal system for a small 3D printer includes a large particle soot filter 1 and a dual-filter-element soot filter 2 connected in sequence. The 3D printer forming chamber is connected to 1 one end of large granule soot filter and is arranged in the filtering to contain the large granule smoke and dust in the soot gas, and double filter core soot filter 2 is connected to the other end. The dual cartridge soot filter 2 comprises: two filter element filter cartridges 21, intake pipe 22, blast pipe 23, be equipped with two mutual separated filter cartridge chamber 211 in two filter element filter cartridges 21, two filter cartridge chamber 211 upper ends respectively are equipped with a gas discharge chamber 212, and respectively be equipped with a filter core 213 in two filter cartridge chambers 211, filter core 213 one end and gas discharge chamber 212 intercommunication and keep apart gas discharge chamber 212 and filter cartridge chamber 211, the gas vent of large granule soot filter 1 is connected to intake pipe 22 one end, the other end is connected to two filter cartridge chambers 211 simultaneously, 23 one end of blast pipe is connected to two gas discharge chambers 212 simultaneously, the return air inlet of a fan 3 is connected to the other end. The air supply outlet of the fan 3 is connected with the forming chamber of the 3D printer, and the smoke dust raised above the forming chamber is blown into the large-particle smoke dust filter 1, so that the inert gas is recycled. The dual core soot filter 2 of the present invention has a plurality of switchable filtering modes. According to an embodiment of the invention, the plurality of switchable filtering modes may comprise: a single filter element filtering mode, a double filter element filtering mode, a single and double filter element mixing filtering mode, a double filter element air quantity asymmetric adjusting mode and the like. Specifically, the single-filter-element filtering mode may be that one of the two filter elements is selected for filtering according to a working condition, and when the difference between the internal pressure and the external pressure of the filter element reaches a threshold value, the other filter element is automatically switched to continue filtering. The double-filter-element filtering mode can be that two filter elements are selected to filter simultaneously according to working conditions. The single-filter-element and double-filter-element mixed filtering mode can be switched between a single-filter-element filtering mode and a double-filter-element filtering mode in real time according to real-time working conditions. The double-filter-element air quantity asymmetric adjusting mode can be that the amount of air introduced into the two filter elements is adjusted according to the using degree of the two filter elements.
Further, the switching between the various switchable filter modes of the dual-cartridge soot filter 2 is effected by means of pneumatic valves 24 which are respectively arranged on the inlet line 22 and the outlet line 23. According to an embodiment of the present invention, as shown in the figure, the pipes connecting the inlet pipe 22 to the two filter cartridge cavities 211 are respectively provided with a pneumatic butterfly valve, and the pipes connecting the outlet pipe 23 to the two outlet chambers 212 are also respectively provided with a pneumatic butterfly valve for controlling the flow rate of the gas and the on-off of the gas.
Furthermore, the air inlet pipe 22 and the air outlet pipe 23 are respectively provided with a first pressure detection port 214 for connecting a detection probe of the differential pressure detection device 25, and the differential pressure between the inside and the outside of the filter element of the whole dual-filter-element filter cartridge 21 is detected through the first pressure detection port 214.
Further, the side walls of the two filter cylinder cavities 211 and the two exhaust chambers 212 are respectively provided with a second pressure detection port 215 for connecting a detection probe of the differential pressure detection device 26, and the internal and external differential pressures of the filter element 213 in the two filter cylinder cavities 211 are respectively detected through the second pressure detection port 215.
Further, the pneumatic valve 24 and the differential pressure detection devices 25 and 26 are in signal connection with a controller 27, the controller 27 receives the information of the internal and external differential pressure of the whole filter element of the dual-filter-element filter cartridge 21 and the information of the internal and external differential pressure of the single filter element 213 in the two filter cartridge cavities 211 sent by the differential pressure detection devices 25 and 26, judges and selects one or more of the multiple switchable filter modes according to the working conditions for filtering, and sends the selection result to the pneumatic valve 24 through signals for corresponding switch operation. Specifically, the working condition may be a working mode preset in the system and selected by an operator before printing starts, or information is acquired in real time according to sensors such as wind speed, smoke concentration, and pressure arranged in a printer forming chamber and at a filter air inlet, and the like, and is sent to the controller 27 to determine the current working condition. For example, when less smoke is generated in the current printing process, the smoke concentration sensor arranged at the air inlet of the filter collects smoke concentration information and sends the smoke concentration information to the controller 27, the controller 27 judges that the current smoke concentration is in a smaller threshold range, only one filter element is needed to effectively filter smoke at the moment, one filter element is selected to filter, and a control signal is sent to the corresponding pneumatic valve 24 on the air inlet and the air outlet of the other filter element to perform the turn-off operation. Further, before sending a control signal to the pneumatic valve 24 to perform the turn-off operation, the controller 27 may further analyze the pressure difference information of the two filter elements, determine whether any filter element has reached the usage limit, or determine which filter element has a lower blocking rate, and then select a more efficient filter element to filter. When a single filter element filtering mode is selected, one filter element can be switched to another filter element to be continuously used after reaching the filtering limit, and the service life of the filter element is prolonged. And because two filter cylinder chambers are mutually independent, when one filter element works, the other filter element can be replaced, so that the influence on the printing effect caused by the replacement of the filter element in the printing process is avoided. If the two filter elements are used in sequence and then are replaced uniformly, the replacement frequency of the filter elements can be reduced, and the labor is saved. When the controller judges that the internal and external pressure differences of the two filter elements reach a certain threshold value according to the pressure difference information and need to be replaced, a signal is sent to remind an operator to replace the filter elements.
Further, the controller 27 receives the information of the pressure difference between the inside and outside of the filter element of the dual filter element filter cartridge 21 and the information of the pressure difference between the inside and outside of the filter element 213 in the two filter cartridge cavities 211 sent by the pressure difference detection devices 25 and 26, determines and selects one or more of the multiple switchable filter modes for filtering according to the working conditions, further analyzes the usage degree of the two filter elements 213 according to the information of the pressure difference between the inside and outside of the filter elements 213 in the two filter cartridge cavities 211, and controls the pneumatic valve 24 to adjust the amount of gas introduced into the two filter elements 213. Specifically, the controller 27 analyzes the information of the internal and external pressure difference of the two filter elements, and can introduce a relatively large amount of gas into the filter element with high filtering efficiency and a relatively small amount of gas into the filter element with low filtering efficiency. And, the difference of letting in gas volume between two filter cores needs to be controlled in certain extent, avoids two filter cartridge chambeies between the pressure differential too big, influences structural stability.
According to an embodiment of the present invention, the controller 27 may also select a single-filter and dual-filter mixed filtering mode according to a real-time condition, so as to ensure that both filters can be utilized to the maximum extent.
Further, the air inlet pipe 22 may be a U-shaped pipe, the U-shaped pipe includes a first communicating section 221 and two first ports 222 connected by the first communicating section 221, an air inlet 223 is disposed in the middle of the first communicating section 221, the two first ports 222 are respectively communicated with the two filter cartridge cavities 211, the air outlet pipe 23 is also a U-shaped pipe, the U-shaped pipe includes a second communicating section 231 and two second ports 232 connected by the second communicating section 231, an air outlet 233 is disposed in the middle of the second communicating section 231, and the two second ports 232 are respectively communicated with the two air outlet chambers 212.
Furthermore, the tops of the two exhaust chambers 212 are respectively clamped with an upper cover 215, and the joint seam is sealed by a clamping ring 216, so that an operator can conveniently open the upper cover to replace the filter element.
According to an embodiment of the present invention, the two upper covers 215 may further include an automatic back-blowing device 29, which includes an air tank, a control valve (specifically, a pulse solenoid valve), and a back-blowing pipe, wherein the control valve connects the air tank and the back-blowing pipe, and the back-blowing pipe is disposed directly above the filter element. When the information about the internal and external pressures of the whole filter element of the dual-filter-element filter cartridge 21 or the internal and external pressure differences of the filter elements 213 in the two filter cartridge cavities 211, which are sent by the pressure difference detection devices 25 and 26 and received by the controller 27, exceed a threshold value, the controller 27 sends a back-blowing control signal to the control valve, where the back-blowing control signal may be back-blowing the single filter element or back-blowing the dual filter elements simultaneously. At the moment, the control valve blows the filter element through the blowback pipe by the gas in the gas storage tank according to the set frequency, so that dust particles fall off under the action of instant high-pressure airflow. The device has the advantages that redundant materials on the surface of the filter element are periodically cleaned, so that the running resistance of the device is relatively stable, the use efficiency of the filter element is improved, and the stable work of the 3D printer is guaranteed. Further, while the back flushing is performed, the pressure detection probe of the pressure difference detection device disposed at the air inlet or the pressure detection probe of the pressure difference detection device disposed at the second pressure detection port 215 on the wall of the filter cartridge chamber performs pressure detection synchronously. The control valve feeds back the back blowing pressure to the controller 27 in real time, and the pressure detection probe also feeds back the pressure measured in the back blowing process to the controller 27 in real time. After the back flushing is carried out for a preset time, the controller 27 compares the back flushing pressure with the pressure measured by the pressure detection probe, when the back flushing pressure and the pressure measured by the pressure detection probe are close to each other, the back flushing is indicated to obtain a certain effect, the filter element is dredged to a certain degree, and then a signal is sent to the control valve to stop the back flushing and continue filtering. And when the difference between the sizes of the filter element and the filter element is large, for example, the back flushing pressure is 500pa, and the pressure measured at the air inlet is 10pa or lower, the filter element is not dredged after back flushing, the surface filter element can be out of work to the maximum extent, and at this moment, another filter element needs to be switched to for filtering, or the filter element needs to be replaced. According to the scheme, whether the filter element is invalid and how the back blowing effect is achieved can be judged in real time in the back blowing process, feedback is timely and efficient, and resource waste caused by repeated back blowing of the invalid filter element is avoided.
Further, the two exhaust chambers 212 may be hollow cylindrical structures, the lower portions of the two exhaust chambers are nested in the filter cylinder cavity 211, the outer walls of the two exhaust chambers are integrally connected with the upper opening edge of the filter cylinder cavity 211, the bottom edge of the two exhaust chambers is provided with an inwardly extending annular support 2121, the upper surface of the annular support 2121 is provided with a plurality of connecting columns 2122, the top end of the filter element 213 is provided with an annular boss 2131 which is arranged on the annular support 2121, and the annular boss 2131 is correspondingly provided with through holes which are in inserting fit with the connecting columns on the annular support 2121 at the bottom of the exhaust chamber 212.
Further, the lower end of the filter element 213 extends downward to a position close to the bottom surface of the filter cartridge cavity 211, and the air inlet pipe 22 is connected to the position of the upper half part of the side wall of the filter cartridge cavity 211 facing the filter element 213, so that dust-containing gas can enter the exhaust chamber from the inside of the filter element after being filtered by the filter element, and the unfiltered gas is prevented from directly entering the exhaust chamber from the bottom of the filter element.
Furthermore, the joint seams of the air inlet pipe 22, the air outlet pipe 23 and the pneumatic valve 24 are sealed by a clamping ring 28, so that air leakage is prevented.
According to one embodiment of the invention, the large particle smoke dust filter 1 comprises a filter cartridge 11 and a collecting tank 12, wherein the filter cartridge 11 comprises an air inlet section 111 and an air outlet section 112, the top end of the air inlet section 111 is a closed end, and the closed end is close to the top end of the air inlet section 111Set up air inlet 111a on the lateral wall of end, air inlet 111a is used for letting in 3D printer forming chamber exhaust and contains the smoke and dust gas, and a cylindricality welding piece 113 is established to coaxial cover in the section of admitting air 111, and cylindricality welding piece 113 top is connected with section 111 top of admitting air, and the lower extreme downwardly extending reaches the same position with section 111 height of admitting air. The cylindrical weldment 113 may be square, prismatic, conical, cylindrical, etc. When the columnar welding part 113 is in an inverted cone shape, the gas has a larger contact area with the columnar welding part 113 immediately after entering the filter cartridge, and the blocking efficiency of large particles at the initial stage can be improved. In this embodiment, the cylindrical welding member 113 is a cylinder. The cylinder shape is uniform, so that the air flow distribution is uniform, and the flow velocity is uniform around the circumference. The exhaust section 112 is connected to the lower end of the air intake section 111, an exhaust port 112a is arranged on the side wall of the exhaust section, the filtered dust-containing gas is discharged from the exhaust port 112a, and the lower end of the exhaust section 112 is communicated with the collecting tank 12. Further, the height h of the air intake section 1111Greater than the height of the exhaust section 112. Specifically, the height h of the air intake section 1111Can be for straining a two-thirds of the whole height H of section 11, the high setting of air inlet section can make dusty air current and cylindricality welding part 113 fully contact for higher, improves the filterable efficiency of large granule smoke and dust to prevent that the large granule smoke and dust of part air current from not filtering just gets into next level filter, leads to the filter core to block. Further, the exhaust port 112a is provided on the side wall near the bottom end position of the exhaust section 112. Further, a manual butterfly valve 13 is arranged on a connecting pipe connecting the bottom end of the exhaust section 112 and the collection tank 12, and a joint seam where the connecting pipe is connected with the manual butterfly valve 13 is sealed by a clamping ring 14. The setting of manual butterfly valve 13 can make things convenient for operating personnel to dismantle, clear up the holding vessel, and clamp ring 14 can prevent that gas from revealing. Further, a first annular connecting piece 111b is arranged on the outer side wall of the bottom end of the air inlet section 111, a second annular connecting piece 112b is arranged on the outer side wall of the top end of the air outlet section 112, and the first annular connecting piece 111b and the second annular connecting piece 112b are in plug-in fit through a connecting column and a jack which are correspondingly arranged on the first annular connecting piece 111b and the second annular connecting piece 112 b. The first annular connector 111b and the second annular connector 112b may also be engaged in a nested manner, a threaded manner, by a nut and screw lock, or the like. The two-stage design of the filter cartridge 11 allows for a filterHolistic dismantlement and change make things convenient for more, labour saving and time saving, can satisfy quick replacement's demand. Alternatively, a seal ring or a clamp ring may be disposed at the joint seam of the first annular connector 111b and the second annular connector 112b for sealing. The large particle smoke filter 1 works on the principle that smoke-containing gas enters the filter cylinder 11 from the gas inlet 111a, flows out from two sides of the cylinder through the blocking of the cylindrical welding part 113, so that large particle dust in the gas flow falls into the collecting tank 12, and most of the rest dust enters the double-filter-element filter 2 from the gas outlet 112b along with the gas.
According to another aspect of the present invention, there is provided a control method of a dual-cartridge dust removal system for a small 3D printer, comprising the steps of:
detecting the internal and external pressure difference information of the filter element of the whole double-filter-element filter cylinder and the independent internal and external pressure difference information of the filter elements in the two filter cylinder cavities;
judging and selecting one or more of a plurality of switchable filtering modes for filtering by combining the differential pressure information and the current working condition;
and sending the selection result to the pneumatic valve through a signal to perform corresponding switch operation.
And further, after one or more of the multiple switchable filtering modes are selected for filtering, the using degrees of the two filter elements are further analyzed according to the independent internal and external pressure difference information of the filter elements in the two filter cylinder cavities, and the pneumatic valve is controlled to adjust the gas amount introduced into the two filter elements.
The method may further include the other steps, which are not described herein again.
The embodiments in the above embodiments can be further combined or replaced, and the embodiments are only used for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various changes and modifications made to the technical solution of the present invention by those skilled in the art without departing from the design idea of the present invention belong to the protection scope of the present invention.
Claims (10)
1. A double-filter-element dust removal system applied to a small 3D printer is characterized by comprising a large-particle smoke filter and a double-filter-element smoke filter which are sequentially connected;
one end of the large-particle smoke dust filter is connected with the 3D printer forming chamber and used for filtering large-particle smoke dust in smoke-containing gas, and the other end of the large-particle smoke dust filter is connected with the double-filter-element smoke dust filter;
the dual-filter-element soot filter comprises: the filter comprises a double-filter-element filter cylinder, an air inlet pipe and an air outlet pipe, wherein two filter cylinder cavities which are mutually separated are arranged in the double-filter-element filter cylinder, an air exhaust chamber is arranged at the upper ends of the two filter cylinder cavities respectively, a filter element is arranged in each of the two filter cylinder cavities, one end of each filter element is communicated with the corresponding air exhaust chamber and isolates the corresponding air exhaust chamber from the corresponding filter cylinder cavity, one end of the air inlet pipe is connected with an air exhaust port of the large-particle smoke filter, the other end of the air inlet pipe is connected with the two filter cylinder cavities simultaneously, one end of the air outlet pipe is connected with the two air exhaust chambers simultaneously, and the other end of the air outlet pipe is connected with a return air inlet of a fan;
the dual core soot filter has a plurality of switchable filter modes.
2. The dual-filter dust removal system for the small 3D printer according to claim 1, wherein the dual-filter dust filter is switched among a plurality of switchable filter modes by pneumatic valves respectively arranged on the air inlet pipe and the air outlet pipe.
3. The dual-filter dust removal system applied to the small 3D printer according to claim 2, wherein the air inlet pipe and the air outlet pipe are respectively provided with a first pressure detection port for connecting a detection probe of a pressure difference detection device, and the pressure difference between the inside and the outside of the filter element of the dual-filter cartridge whole body is detected through the first pressure detection port.
4. The dual-filter dust removal system applied to the small 3D printer according to claim 3, wherein the two filter cartridge cavities and the two exhaust chambers are respectively provided with a second pressure detection port on the side wall for connecting a detection probe of a differential pressure detection device, and the internal and external differential pressures of the filter cartridge in the two filter cartridge cavities are respectively detected through the second pressure detection ports.
5. The dual-filter cartridge dedusting system applied to the small 3D printer according to claim 4, wherein the pneumatic valve and the differential pressure detection device are in signal connection with a controller, the controller receives the filter cartridge internal and external differential pressure information of the dual-filter cartridge as a whole and the filter cartridge internal and external differential pressure information of the filter cartridges in the two filter cartridge cavities, which are sent by the differential pressure detection device, and judges and selects one or more of the multiple switchable filter modes to filter according to working conditions, and sends a selection result to the pneumatic valve to perform corresponding switch operation through signals.
6. The dual-filter dust removal system applied to the small 3D printer according to claim 5, wherein the controller receives filter element internal and external pressure difference information of the entire dual-filter cartridge and the filter element internal and external pressure difference information of the filter elements in the two cartridge chambers, which are sent by the pressure difference detection device, determines and selects one or more of the multiple switchable filter modes for filtering according to working conditions, further analyzes the usage degree of the two filter elements according to the internal and external pressure difference information of the filter elements in the two cartridge chambers, and controls the pneumatic valve to adjust the amount of gas introduced into the two filter elements.
7. The dual-filter cartridge dedusting system applied to the small 3D printer according to claim 1, wherein the air inlet pipe is a U-shaped pipe, the U-shaped pipe comprises a first communicating section and two first ports connected by the first communicating section, an air inlet is arranged in the middle of the first communicating section, the two first ports are respectively communicated with the two filter cartridge cavities, the exhaust pipe is also a U-shaped pipe, the U-shaped pipe comprises a second communicating section and two second ports connected by the second communicating section, an exhaust port is arranged in the middle of the second communicating section, and the two second ports are respectively communicated with the two exhaust chambers.
8. The dual-filter dust removal system for the small 3D printer according to claim 1, wherein the top of the two exhaust chambers are respectively engaged with an upper cover, and the joint seam is sealed by a clamping ring.
9. The control method of the double-filter-element dust removal system applied to the small-sized 3D printer according to claim 4, characterized by comprising the following steps:
detecting the internal and external pressure difference information of the filter element of the whole double-filter-element filter cylinder and the independent internal and external pressure difference information of the filter elements in the two filter cylinder cavities;
judging and selecting one or more of the multiple switchable filtering modes for filtering by combining the differential pressure information and the current working condition;
and sending the selection result to the pneumatic valve through a signal to perform corresponding switch operation.
10. The control method of the double-filter-element dust removal system applied to the small-sized 3D printer according to claim 9,
after one or more of the multiple switchable filtering modes are selected for filtering, the using degrees of the two filter elements are further analyzed according to the independent internal and external pressure difference information of the filter elements in the two filter cylinder cavities, and the pneumatic valve is controlled to adjust the gas amount introduced into the two filter elements.
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Application publication date: 20210921 |