Dust filtering device and 3D printer

Abstract

The utility model relates to the technical field of 3D printing, in particular to a dust filtering device and a 3D printer. The filtering device comprises a barrel, a back flushing assembly and a plurality of filter elements. Wherein a first chamber and a second chamber are arranged in the cylinder body, and an air inlet communicated with the first chamber and an air outlet communicated with the second chamber are formed in the cylinder body; the filter element is arranged in the first cavity, one end of the filter element extends into the second cavity, the filter element is of a hollow structure, and at least one ventilation opening is formed in the end, located in the second cavity, of the filter element; the reverse blowing assembly is arranged in the second cavity and used for spraying gas into the ventilation opening. When the filter element needs to be cleaned, high-pressure airflow is jetted into the ventilation opening through the back flushing assembly, dust gathered on the outer surface of the filter element is flushed out after the high-pressure airflow enters the hollow filter element, dust cleaning work can be conducted on the filter element under the condition that the filter element is not disassembled, and the working efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to 3D printing technical field, concretely relates to a dust filtering device and 3D printer. BACKGROUND

[0002] Metal 3D printing is with metal powder as printing raw material, according to design model, utilize the high temperature of laser beam to the metal powder of specific area and carry out sintering, to obtain the product with specific structure. The whole printing processing needs to carry out in the processing chamber full of inert gas protection, to avoid the reaction of metal powder with active gas under high temperature, to ensure the safety of processing. Because the smoke will be produced in the sintering process of metal powder, and there will be metal dust flying when spreading powder. These smoke dust not only will influence the propagation of laser beam, also can reduce the precision and quality of metal 3D printing, therefore need to carry out dust cleaning treatment to the inert gas in processing chamber.

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

[0004] Although the existing filter can filter the dust in inert gas, but in the use process, because the metal dust produced in the process of 3D printing accumulates on the filter core at a relatively fast speed, the frequency of cleaning or replacing the filter core is relatively high, and the filter core needs to be disassembled for cleaning or replacement, which prolongs the working time of cleaning. UTILITY MODEL CONTENTS

[0005] In view of the above-mentioned defects, the technical problem to be solved by the utility model is to provide a dust filtering device and a 3D printer, which can clean the filter core without disassembling the filter core.

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

[0007] In the first aspect, a dust filtering device is provided, comprising:

[0008] A cylinder is provided with a first chamber and a second chamber inside, an air inlet communicated with the first chamber is arranged on the cylinder, and an air outlet communicated with the second chamber is arranged on the cylinder;

[0009] A plurality of filter cores are arranged in the first chamber, one end of the filter core extends into the second chamber, the filter core is a hollow structure, and at least one air vent is arranged at one end of the filter core in the second chamber;

[0010] A backflushing assembly is arranged in the second chamber, and the backflushing assembly is used for spraying gas into the air vent.

[0011] By adopting the above scheme, during use, gas containing dust is introduced into the first chamber through the air inlet. The gas, filtered by the filter element in the first chamber, enters the second chamber through the air vent, and the gas in the second chamber is output through the air outlet. When the filter element needs cleaning, a high-pressure airflow is injected into the air vent via the backflushing assembly. This high-pressure airflow enters the hollow filter element and flushes out the dust accumulated on its outer surface. This allows for dust cleaning of the filter element without disassembling it, improving work efficiency.

[0012] Preferably, the backflushing assembly includes an air supply unit and several jet nozzles corresponding to the filter elements. The air supply unit provides compressed gas, and the air inlet of each jet nozzle is connected to the air supply end of the air supply unit via a pipe. The jet nozzle's nozzle nozzle corresponds to the air vent, and a first control valve is provided on the pipe. When the filter element needs cleaning, the first control valve is opened, and the air supply unit supplies air to the jet nozzles through the pipe. The compressed gas provided by the air supply unit can create a significant impact on the inside of the filter element, making it easier for dust adhering to the outside of the filter element to fall off, resulting in a better cleaning effect.

[0013] Preferably, the first control valve is a pulse-type solenoid valve. Because the first control valve is a pulse-type solenoid valve, the airflow ejected from the jet head can be pulsed. This pulsed airflow creates a vibratory impact on the filter element, thereby improving the cleaning effect on the filter element.

[0014] Preferably, the first chamber is connected to a first pressure sensor via a first pressure tube, and the second chamber is connected to a second pressure sensor via a second pressure tube. The first pressure sensor monitors the pressure in the first chamber via the first pressure tube, and the second pressure sensor monitors the pressure in the second chamber via the second pressure tube. When the pressure difference between the first chamber and the second chamber reaches a preset value, the filter element needs to be cleaned.

[0015] Preferably, the interior of the cylinder is divided into a first chamber and a second chamber by a partition. The first chamber is located below the second chamber. The partition has several mounting holes corresponding to the filter elements, which are then inserted into the corresponding mounting holes. Dividing the interior of the cylinder into the first and second chambers by the partition serves two purposes: firstly, it prevents unfiltered gas from escaping through the outlet; secondly, it provides a support point for installing the filter elements. Since the first chamber is located below the second chamber, dust tends to accumulate more easily at the bottom of the first chamber, facilitating cleaning of the dust within it.

[0016] Preferably, a bracket is provided on the upper side of the partition, and the jet head is fixedly connected to the bracket. The bracket facilitates the support of the jet head, and at the same time, the vibration generated by the jet head during jetting is transmitted to the partition along the bracket, and then to the cylinder and filter element, thereby improving the dust removal effect in the second chamber.

[0017] Preferably, the bottom of the cylinder is connected to a slag discharge pipe, which is connected to the first chamber. A second control valve is installed on the slag discharge pipe. When cleaning the filter element, the second control valve is opened. Through the second control valve, dust in the second chamber can be discharged, and pressure can be relieved to prevent excessive pressure inside the cylinder.

[0018] Preferably, a filter bag is fitted onto the discharge end of the slag discharge pipe. The filter bag facilitates dust collection and allows for the release of air pressure inside the cylinder.

[0019] Preferably, the second chamber is provided with a plurality of support rods corresponding one-to-one with the filter element, and the end of the filter element located in the first chamber is supported on the corresponding support rod. The filter element is supported by the support rods, thereby improving the stability of the filter element.

[0020] Secondly, a 3D printer is provided, including the aforementioned dust filtration device.

[0021] In summary, the dust filtration device provided by this utility model has at least the following beneficial effects:

[0022] 1. The filter element can be cleaned without disassembling it, improving work efficiency.

[0023] 2. It cleverly utilizes the vibration effect of pulsed airflow to improve the cleaning effect on the filter element. Attached image description:

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any novel effort.

[0025] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 2 This is an assembly diagram of the present invention;

[0027] Figure 3 This is a three-dimensional structural diagram of the filter element, partition, bracket and jet head in this utility model;

[0028] Figure 4 This is an assembly diagram of the filter element, partition, bracket and jet head in this utility model;

[0029] Figure 5 This is the front view of this utility model;

[0030] Figure 6 yes Figure 5 A cross-sectional view at point AA (with arrows indicating the gas flow path during filtration).

[0031] The reference numerals in the attached drawings include: cylinder 1, cover 101, cylinder body 102, handle 103, first chamber 2, second chamber 3, air inlet 4, air outlet 5, filter element 6, vent 7, backflush assembly 8, air supply unit 801, jet nozzle 802, pipe 803, jet nozzle 804, first control valve 805, first pressure pipe 9, first pressure sensor 10, second pressure pipe 11, second pressure sensor 12, partition 13, bracket 14, slag discharge pipe 15, second control valve 16, filter bag 17, support rod 18, air inlet pipe 19, air outlet pipe 20, guide plate 21, third control valve 22, and fourth control valve 23. Detailed Implementation

[0032] To enable those skilled in the art to better understand the technical solution of this utility model, the following description is provided in conjunction with the appendix. Figures 1-6 The present invention will be further described in detail below with reference to specific embodiments.

[0033] Please see Figures 1-6This embodiment provides a dust filtration device, comprising: a cylinder 1, a backflushing assembly 8, and a plurality of filter elements 6. The cylinder 1 contains a first chamber 2 and a second chamber 3. The cylinder 1 has an air inlet 4 communicating with the first chamber 2 and an air outlet 5 communicating with the second chamber 3. Specifically, the cylinder 1 includes a cylinder body 102 and a cover 101. The upper end of the cylinder body 102 is open and closed by the cover 101, which is bolted to the cylinder body 102. Two handles 103 are fixedly connected to the upper side of the cover 101 for easy opening. The cylinder 1 is divided into the first chamber 2 and the second chamber 3 by a partition 13. The first chamber 2 is located below the second chamber 3. The partition 13 has a plurality of mounting holes corresponding one-to-one with the filter elements 6, and the filter elements 6 are inserted into the corresponding mounting holes. The filter elements 6 can be removed from the mounting holes when disassembly is required. A bracket 14 is provided on the upper side of the partition 13, and the jet head 802 is fixedly connected to the bracket 14. An air inlet 4 is located on the front side of the cylinder body 102, communicating with the first chamber 2. An air inlet pipe 19 is connected to the air inlet 4, and a third control valve 22 is provided on the air inlet pipe 19. An air outlet 5 is located in the middle of the cover 101, communicating with an air outlet pipe 20, and a fourth control valve 23 is provided on the air outlet pipe 20. The air inlet pipe 19 serves as the input end of the gas to be purified, and the air outlet pipe 20 serves as the output end of the purified gas. Filter elements 6 are disposed in the first chamber 2, with several filter elements 6 evenly distributed along the left-right direction, and adjacent filter elements 6 are spaced apart. The upper end of the filter element 6 extends into the second chamber 3. The filter element 6 has a hollow structure, and at least one air vent 7 is provided at the end of the filter element 6 located in the second chamber 3. In this embodiment, preferably, the filter element 6 is plate-shaped, and one end of the filter element 6 located in the second chamber 3 is provided with two or more air vents 7. The air vents 7 are distributed along the width direction of the filter element 6, and the air vents 804 of the jet head 802 are arranged in a one-to-one correspondence with the air vents 7. In this embodiment, preferably, the filter element 6 is an existing sintered filter element 6. The backflush assembly 8 is disposed in the second chamber 3, and the backflush assembly 8 is used to inject gas into the air vents 7.

[0034] By adopting the above scheme, when filtering gas containing dust, the gas to be filtered is introduced into the first chamber 2 through the air inlet 4. The gas in the first chamber 2 is filtered by the filter element 6 and then enters the second chamber 3. The gas in the second chamber 3 is then discharged as purified gas through the air outlet 5. When it is necessary to clean the dust adhering to the filter element 6, a high-pressure airflow is injected into the air vent 7 through the back-blowing component 8. After the high-pressure airflow enters the hollow filter element 6, it blows the dust accumulated on the outer surface of the filter element 6 outward. This allows for dust cleaning of the filter element 6 without disassembling it, improving work efficiency.

[0035] Please continue reading. Figure 2Preferably, the backflushing assembly 8 includes an air supply unit 801 and a plurality of jet heads 802 corresponding one-to-one with the filter element 6. The air supply unit 801 provides compressed gas and is located outside the cylinder 1. The air inlet of the jet head 802 is connected to the air supply end of the air supply unit 801 via a pipe 803. The jet outlet 804 of the jet head 802 corresponds to the air vent 7. The jet head 802 is located above the filter element 6, and the jet outlet 804 faces downwards. A first control valve 805, which is a pulse-type solenoid valve, is provided on the pipe 803. The pulse-type solenoid valve enables the airflow ejected from the jet head 802 to be a pulsed airflow. This pulsed airflow creates a vibratory impact on the filter element 6, thereby improving the cleaning effect on the filter element 6. In some embodiments, the air supply unit 801 includes an air tank and an air compressor. Compressed air is input into the air tank via the air compressor, and the pipe 803 is connected to the air tank.

[0036] Please continue reading. Figure 1 The first chamber 2 is connected to a first pressure sensor 10 via a first pressure pipe 9, and the second chamber 3 is connected to a second pressure sensor 12 via a second pressure pipe 11. The first pressure sensor 10 monitors the air pressure in the first chamber 2 via the first pressure pipe 9, and the second pressure sensor 12 monitors the air pressure in the second chamber 3 via the second pressure pipe 11. During the gas filtration process, the gas first passes through the first chamber 2, and after being filtered by the filter element 6 in the first chamber 2, the gas enters the second chamber 3 through the vent 7 and is output outward through the outlet 5 in the second chamber 3. When a large amount of dust adheres to the filter element 6, the air pressure in the first chamber 2 will gradually increase due to the obstruction of the dust. When the pressure difference between the first chamber 2 and the second chamber 3 reaches a preset value, the filter element 6 needs to be cleaned.

[0037] Please continue reading. Figure 1 To facilitate slag discharge, preferably, a slag discharge pipe 15 is connected to the bottom of the cylinder 1, which is connected to the first chamber 2. A second control valve 16, which is a pressure relief valve, is installed on the slag discharge pipe 15. The bottom of the cylinder 1 is tapered, wider at the top and narrower at the bottom, to facilitate dust accumulation at the slag discharge pipe 15. To collect the discharged dust, preferably, a filter bag 17, made of breathable material, is fitted onto the discharge end of the slag discharge pipe 15. The filter bag 17 prevents dust from passing through, thus collecting the dust inside the filter bag 17 and preventing excessively high air pressure in the first chamber 2 and the second chamber 3 when gas is injected into the filter element 6. An anti-static mesh cover is also fitted onto the outside of the filter bag 17.

[0038] Please see Figure 6Preferably, the second chamber 3 is provided with a number of support rods 18 that correspond one-to-one with the filter element 6. One end of the filter element 6 located in the first chamber 2 is supported on the corresponding support rod 18, that is, the lower end of the filter element 6 is supported on the corresponding support rod 18.

[0039] Please continue reading. Figure 6 Preferably, a guide plate 21 is fixedly connected inside the second chamber 3. The guide plate 21 is specifically fixed inside the cylinder body 102 and is correspondingly arranged with the air inlet 4. The guide plate 21 guides the airflow entering from the air inlet 4 downwards. On the one hand, it can prevent the airflow from directly impacting the filter element 6 and causing damage to the filter element 6. On the other hand, it can prevent the dust carried by the airflow from concentrating in a certain place on the filter element 6.

[0040] Based on the same inventive concept, this utility model also provides a 3D printer, including the above-mentioned dust filtration device.

[0041] It should be noted that words indicating direction in this article, such as "up" and "down," are all in the format of "upper" and "lower." Figure 1 The direction setting is for ease of description only and has no other specific meaning.

[0042] It should also be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes the aforementioned element.

[0043] This article uses specific examples to illustrate the principles and implementation methods of this utility model. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A dust filtration device, characterized in that, include: The cylinder (1) has a first chamber (2) and a second chamber (3) inside. The cylinder (1) has an air inlet (4) communicating with the first chamber (2) and an air outlet (5) communicating with the second chamber (3). A plurality of filter elements (6) are disposed in a first chamber (2), one end of the filter element (6) extends into a second chamber (3), the filter element (6) is hollow, and the end of the filter element (6) located in the second chamber (3) is provided with at least one vent (7); Backflush assembly (8) is disposed in the second chamber (3) and is used to inject gas into the vent (7).

2. The dust filtration device according to claim 1, characterized in that, The backflush assembly (8) includes an air supply unit (801) and a plurality of jet heads (802) corresponding one-to-one with the filter element (6). The air supply unit (801) is used to provide compressed gas. The air inlet of the jet head (802) is connected to the air supply end of the air supply unit (801) through a pipe (803). The jet outlet (804) of the jet head (802) corresponds to the air inlet (7). A first control valve (805) is provided on the pipe (803).

3. The dust filtration device according to claim 2, characterized in that, The first control valve (805) is a pulse solenoid valve.

4. A dust filtration device according to claim 2, characterized in that, The first chamber (2) is connected to a first pressure sensor (10) via a first pressure tube (9), and the second chamber (3) is connected to a second pressure sensor (12) via a second pressure tube (11).

5. A dust filtration device according to any one of claims 2-4, characterized in that, The interior of the cylinder (1) is divided into a first chamber (2) and a second chamber (3) by a partition (13). The first chamber (2) is located below the second chamber (3). The partition (13) has a number of mounting holes corresponding to the filter element (6) one by one. The filter element (6) is inserted into the corresponding mounting hole.

6. A dust filtration device according to claim 5, characterized in that, The upper side of the partition (13) is provided with a bracket (14), and the jet head (802) is fixedly connected to the bracket (14).

7. A dust filtration device according to claim 5, characterized in that, The bottom of the cylinder (1) is connected to a slag discharge pipe (15), which is connected to the first chamber (2). A second control valve (16) is provided on the slag discharge pipe (15).

8. A dust filtration device according to claim 7, characterized in that, A filter bag (17) is fitted onto one end of the slag discharge pipe (15) that discharges material.

9. A dust filtration device according to claim 7, characterized in that, The second chamber (3) is provided with a number of support rods (18) corresponding to the filter element (6), and one end of the filter element (6) located in the first chamber (2) is supported on the corresponding support rod (18).

10. A 3D printer, characterized in that, Includes the dust filtration device as described in any one of claims 1-9.

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