Sweeping head and sweeping dust-raising dust removal device

Abstract

The utility model belongs to the field of additive manufacturing, and relates to a sweeping head and sweeping dust-raising type dust removal device, the sweeping head includes gas inlet pipe, flow guide chamber, feedback pipe and nozzle, the gas inlet pipe and nozzle are arranged at the top and bottom of flow guide chamber respectively, the gas inlet pipe is communicated with the nozzle through the flow guide chamber, the feedback pipe is arranged at the side of flow guide chamber, the top of feedback pipe is communicated with the top of flow guide chamber, and the bottom of feedback pipe is communicated with the bottom of flow guide chamber. The utility model provides a sweeping head and sweeping dust-raising type dust removal device which can obtain a stable and continuous dust-raising environment, ensure stable mixing of inerting agent and smoke dust and reduce the maintenance cost of the dust removal device.

Description

Technical Field

[0001] This utility model belongs to the field of additive manufacturing and relates to a dust removal device, particularly a sweeping head and a sweeping dust removal device. Background Technology

[0002] In certain industries or operating conditions, such as additive manufacturing, dust collection devices are required to capture highly reactive or highly viscous fumes. Highly reactive fumes have extremely low ignition energy and are highly flammable; highly viscous fumes easily adhere to the filter elements of dust collection devices, are difficult to remove, and cause rapid clogging, significantly reducing filter life. The problems caused by highly reactive and highly viscous fumes can be solved by using an inert pre-coating agent. When the inert pre-coating agent is uniformly mixed with the highly reactive fumes, its reaction rate is significantly reduced. The mixture also prevents the fumes from sticking together and adhering to the filter elements.

[0003] One existing technology offers a relatively economical method for real-time mixing of inert pre-coating and dust. This involves using a guide pipe inserted into the dust collector to direct the dust-laden air to the inert agent pre-added to the dust collector, thus mixing the inert agent with the dust. However, the guide pipe used in this method cannot ensure that the airflow evenly sweeps away the inert agent accumulated in all locations within the dust collector. The effect of agitating the inert agent is often unsatisfactory; sometimes it is difficult to agitate the inert agent, or only a localized area can be agitated. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems in the background art, the present invention provides a sweeping head and a sweeping dust removal device that can obtain a stable and continuous dust environment, ensure stable mixing of inerting agent and dust, and reduce the maintenance cost of dust removal device.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sweeping head, characterized in that: the sweeping head includes a gas inlet pipe, a flow guiding cavity, a feedback pipe, and a nozzle; the gas inlet pipe and the nozzle are respectively disposed at the top and bottom of the flow guiding cavity; the gas inlet pipe communicates with the nozzle through the flow guiding cavity; the feedback pipe is disposed on the side of the flow guiding cavity; the top of the feedback pipe communicates with the top of the flow guiding cavity; the bottom of the feedback pipe communicates with the bottom of the flow guiding cavity.

[0006] The aforementioned feedback tube includes a left feedback tube and a right feedback tube; the left feedback tube and the right feedback tube are symmetrically arranged on the side of the flow guide cavity.

[0007] The aforementioned left and right feedback tubes are symmetrically arranged on the side of the guide cavity along the axial direction of the guide cavity.

[0008] The axes of the left feedback tube, the guide cavity, and the right feedback tube are all in the same plane.

[0009] The top of the aforementioned feedback tube is connected to the junction of the gas inlet tube and the guide cavity; the bottom of the feedback tube is connected to the junction of the guide cavity and the nozzle.

[0010] The gas inlet pipe is shaped like an inverted frustum; the flow guide cavity has a gradually expanding structure from top to bottom; the nozzle has a rapidly expanding structure from top to bottom; and the area of ​​the opening at the top of the nozzle is smaller than the area of ​​the expanding opening at the bottom of the flow guide cavity.

[0011] A sweeping dust removal device based on the sweeping head as described above, characterized in that: the sweeping dust removal device includes a gas discharge pipe, a dust gas inlet pipe, a dust gas chamber, a waste bin, and the sweeping head as described above; the dust gas inlet pipe and the gas discharge pipe are respectively connected to the interior of the dust gas chamber; the sweeping head is placed inside the dust gas chamber and connected to the end of the dust gas inlet pipe; the dust gas chamber is connected to the waste bin.

[0012] The aforementioned sweeping dust removal device also includes a dust treatment device placed inside the dust chamber; the dust gas inlet pipe is connected to the gas outlet pipe through the dust chamber and the dust treatment device.

[0013] The aforementioned dust treatment device includes a filter element and a filter element purification mechanism; the filter element is installed inside the dust chamber and divides the dust chamber into a clean air chamber and a reaction chamber; the dust gas inlet pipe is connected to the reaction chamber; the reaction chamber is connected to the waste bin; the clean air chamber is connected to the gas outlet pipe; the filter element purification mechanism is placed in the clean air chamber; the filter element purification mechanism is a backflushing mechanism, a mechanical vibration mechanism, and / or a mechanical scraping mechanism.

[0014] The advantages of this utility model are: This utility model provides a sweeping head and a sweeping dust removal device. The sweeping head includes a gas inlet pipe, a guide chamber, a feedback pipe, and a nozzle. The gas inlet pipe and the nozzle are respectively located at the top and bottom of the guide chamber. The gas inlet pipe communicates with the nozzle through the guide chamber. The feedback pipe is located on the side of the guide chamber. The top of the feedback pipe communicates with the top of the guide chamber, and the bottom of the feedback pipe communicates with the bottom of the guide chamber. This utility model also provides a sweeping dust removal device based on this sweeping head. The sweeping dust removal device includes a gas outlet pipe, a dust gas inlet pipe, a dust gas chamber, a waste bin, and the sweeping head as described above. The dust gas inlet pipe and the gas outlet pipe communicate with the interior of the dust gas chamber. The sweeping head is placed inside the dust gas chamber and connected to the end of the dust gas inlet pipe. The dust gas chamber communicates with the waste bin. An inerting agent addition port is provided on the side wall of the dust gas chamber. The sweeping dust removal device provided in this utility model employs a sweeping head with a special duct structure, which creates a reciprocating sweeping airflow inside the dust chamber, evenly and thoroughly cleaning all areas without dead zones. This ensures a stable and continuous dust-generating environment, guaranteeing the stable mixing of the inerting agent and the dust. Furthermore, the dust within the entire dust removal device is transformed from high-purity flammable dust into a uniformly mixed substance with the inerting agent, significantly reducing its reactivity and making it difficult to ignite in air, thus greatly improving safety. The sweeping dust removal device of this utility model generates a continuous dust-generating environment in the dust chamber without any electric or pneumatic actuators, reducing the maintenance cost, manufacturing cost, and failure rate of the dust removal device. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural schematic diagram of the sweeping head provided by this utility model; Figure 2 This is a schematic diagram of the structure of the sweeping dust removal device provided by this utility model; Figure 3 This is a schematic diagram of the sweeping dust removal device provided by this utility model in use; in: 1-Gas exhaust pipe; 2-Dust gas inlet pipe; 3-Filter element; 4-Sweeping head; 5-Dust gas chamber; 6-Inerting agent; 7-Waste bin; 8-Inerting agent addition port; 9-Clean air chamber; 10-Backflush mechanism; 11-Nozzle; 12-Feedback pipe; 13-Guide chamber; 14-Gas inlet pipe. Detailed Implementation

[0016] See Figure 1This utility model provides a sweeping head, including a gas inlet pipe 14, a flow guiding cavity 13, a feedback pipe 12, and a nozzle 11; the gas inlet pipe 14 and the nozzle 11 are respectively disposed at the top and bottom of the flow guiding cavity 13; the gas inlet pipe 14 communicates with the nozzle 11 through the flow guiding cavity 13; the feedback pipe 12 is disposed on the side of the flow guiding cavity 13; the top of the feedback pipe 12 communicates with the top of the flow guiding cavity 13; the bottom of the feedback pipe 12 communicates with the bottom of the flow guiding cavity 13.

[0017] See Figure 1 The feedback tube 12 used in this invention includes a left feedback tube and a right feedback tube; the left and right feedback tubes are symmetrically arranged on the side of the guide cavity 13. For example, the left and right feedback tubes are symmetrically arranged on the side of the guide cavity 13 along its axial direction. To enable better sweeping, the axis of the left feedback tube, the axis of the guide cavity 13, and the axis of the right feedback tube are in the same plane.

[0018] Continue to participate Figure 1 In this invention, the top of the feedback pipe 12 is connected to the junction of the gas inlet pipe 14 and the guide cavity 13; the bottom of the feedback pipe 12 is connected to the junction of the guide cavity 13 and the nozzle 11. It should be noted that the gas inlet pipe 14 is generally shaped like an inverted frustum; the guide cavity 13 has a gradually expanding structure from top to bottom; the nozzle 11 has a rapidly expanding structure from top to bottom; and the area of ​​the opening at the top of the nozzle 11 is smaller than the area of ​​the expanding opening at the bottom of the guide cavity 13.

[0019] See Figure 3 The sweeping head provided by this utility model works as follows: Figure 3 As shown in (a), when airflow impacts the gas inlet pipe 14 of the guide cavity 13, the impacting airflow will be adsorbed onto the wall of either side of the guide cavity 13 due to the Kant effect. Taking adsorption on the left side as an example (adsorption on the right side is the same process, with the airflow direction inside the guide cavity 13 being a mirror image of the left side), the impacting airflow path will be biased to the left in the guide cavity 13. Since the guide cavity 13 has a gradually expanding structure, when the impacting airflow touches the left wall inside the guide cavity 13, it will cause the airflow at the nozzle 11 to be biased to the right. At the same time, due to the deflection of the airflow path, some of the circulating air will enter the feedback pipe 12 on the left side. The airflow entering the left feedback pipe 12 will be guided back to the inlet of the guide cavity 13 (i.e., the intersection of the gas inlet pipe 14 and the guide cavity 13), acting on the airflow that was originally biased to the left, increasing the air pressure on its left side, which will cause the airflow path to be biased to the right. After passing the neutral point, the airflow path will be further adsorbed to the right side of the guide cavity 13 due to the Kant effect. See [reference needed]. Figure 3(b) After the airflow at the inlet of the guide cavity 13 is deflected to the right side of the guide cavity 13, the airflow at the nozzle 11 changes direction and deflects to the left. At this time, due to the deflection of the airflow path, some of the circulating airflow enters the right feedback pipe 12. The airflow entering the right feedback pipe 12 is guided back to the inlet of the guide cavity 13 (i.e., the intersection of the gas inlet pipe 14 and the guide cavity 13), acting on the airflow that was originally deflected to the right, increasing the air pressure on its right side, which in turn causes the airflow path to deflect to the left. After passing the neutral point, the airflow path is further attracted to the left side of the guide cavity 13 due to the Kant effect, changing the airflow direction again. Thus, a left-right reciprocating sweep can be achieved at the bottom of the nozzle 11.

[0020] See Figure 2 This utility model provides a sweeping dust removal device in addition to the sweeping head described above, including a gas discharge pipe 1, a dust gas inlet pipe 2, a dust gas chamber 5, a waste bin 7, and a sweeping head 4 as described above; the dust gas inlet pipe 2 and the gas discharge pipe 1 are respectively connected to the interior of the dust gas chamber 5; the sweeping head 4 is placed inside the dust gas chamber 5 and connected to the end of the dust gas inlet pipe 2; the dust gas chamber 5 is connected to the waste bin 7, and an inerting agent addition port 8 is provided on the side wall of the dust gas chamber 5. The dust gas inlet pipe 2 is special in that it extends from the outside of the dust collector into the central area inside the dust gas chamber 5, and extends downward to the lower part of the dust gas chamber, with its opening facing downward.

[0021] Waste bin 7 is located at the bottom of dust chamber 5 and is used to collect inerting agent and fumes discharged from dust chamber 5. Waste bin 7 and dust chamber 5 are separated by a valve, which is generally a butterfly valve or a slide valve, or any other valve with on / off function.

[0022] The sweeping dust collector also includes an inerting agent inlet 8 located on the side wall of the dust chamber 5. Inerting agent 6 can be added or replenished to the dust chamber 5 through the inerting agent inlet 8. The inerting agent 6 functions to uniformly mix with highly reactive dust, thereby preventing violent reactions that could lead to combustion or explosion. It can also act as a pre-coating for the filter element, protecting it. Any inerting agent meeting the above conditions can be used in this method, with calcium carbonate powder being preferred. For example, the inerting agent 6 can be added into the dust chamber 5 through the inerting agent inlet 8 and stored at the bottom of the dust chamber 5. Generally, the inerting agent inlet 8 must be equipped with an opening and closing device, such as a valve, blind flange, or manhole, for resealing the dust collector after adding the inerting agent. The inerting agent can be added manually or automatically through the inerting agent inlet using pneumatic conveying or other methods. Furthermore, the inerting agent inlet can be located on the side wall of the dust collector, at the bottom constriction section, or on the dust inlet pipe.

[0023] The sweeping dust removal device provided by this utility model can directly process filtered dust gas. The dust gas, transported to the dust chamber 5 through the dust gas inlet pipe 2, has undergone pre-filtration, such as coarse filtration. It is then mixed with an inert agent in the dust chamber 5 by the sweeping head 4, further enhancing the dust removal effect. For example, the sweeping dust removal device also includes a fume treatment device placed inside the dust chamber 5. The dust gas transported to the dust chamber 5 through the dust gas inlet pipe 2 is directly generated by additive manufacturing. It is mixed with an inert agent in the dust chamber 5 by the sweeping head 4, and then filtered by the fume treatment device inside the dust chamber 5, also achieving excellent dust removal results. The dust gas inlet pipe 2 is connected to the gas outlet pipe 1 through the interior of the dust chamber 5 and the fume treatment device.

[0024] The dust treatment device includes a filter element 3 and a filter element purification mechanism. The filter element 3 is disposed inside the dust chamber 5, dividing the dust chamber 5 into a clean air chamber 9 and a reaction chamber. The dust inlet pipe 2 is connected to the reaction chamber. The reaction chamber is connected to the waste bin 7. The clean air chamber 9 is connected to the gas outlet pipe 1. The filter element purification mechanism is placed in the clean air chamber 9. Exemplarily, the filter element purification mechanism is a backflushing mechanism 10, a mechanical vibration mechanism, and / or a mechanical scraping mechanism. Circulating air carrying dust enters through the dust inlet pipe 2, is filtered by the filter element 3, and is discharged through the gas outlet pipe 1. The power source for the circulating air can be a fan, an air pump, etc. The filter element purification mechanism is used to remove the inerting agent and dust adsorbed on the filter element 3. Preferably, the filter element purification mechanism used in this invention employs a backflushing mechanism 10, which is used to blow the inerting agent and dust adsorbed on the filter element from the inside out. For example, the backflush mechanism 10 used in this utility model is a conventional backflush mechanism composed of a pulse valve, an air manifold, and a blowpipe.

[0025] The specific usage of the sweeping dust removal device provided by this utility model is as follows: 1) Keep the valve between the dust chamber 5 and the waste bin 7 in the closed state, and add inert agent 6 through the inert agent addition port so that the inert agent 6 is stored at the bottom of the dust chamber 5; 2) When the circulating air starts, the dust and gas enter the sweeping head 4 through the dust inlet pipe 2; 3) such as Figure 3 As shown in (a), the circulating air will be adsorbed on the wall on either side (e.g., the left side) at the inlet of the guide cavity 13 of the sweep head 4 due to the Kant effect, causing the air path to deviate to the left, which in turn causes the air at the nozzle 11 to deviate to the right. At the same time, due to the deflection of the air path, a portion of the circulating air enters the feedback pipe 12 on the left side. 4) The air entering the left feedback pipe 12 is redirected back to the inlet of the guide cavity, acting on the air that was originally biased to the left, increasing the air pressure on its left side, which in turn causes the airflow path to shift to the right. After passing the neutral point, the airflow path is further drawn to the right side of the guide cavity 13 due to the Kant effect, such as... Figure 3 As shown in (b); 5) Similar to step 3), after the air at the inlet of the guide cavity 13 is deflected to the right side of the guide cavity 13, the air at the nozzle 11 changes direction and is deflected to the left side. At the same time, the air in the left feedback pipe 12 appears in the right feedback pipe 12. Then, similar to step 4, the air direction is changed again. 6) At this point, the circulating air will continue to repeat steps 3), 4) and 5), sweeping back and forth at the bottom of the dust chamber 5, repeatedly raising the inerting agent 6 at the bottom of the dust chamber, forming a continuous and stable dust environment. 7) At the same time, the smoke and dust enter the dust chamber 5 through the dust inlet pipe 2 along with the circulating air. The smoke and dust mix with the inerting agent 6 in the dusty environment of the dust chamber 5 and are blown onto the filter element 3 by the circulating air. 8) After a certain period of operation, the back-flushing mechanism 10 is activated to back-flush the filter element 3. The airflow ejected by the back-flushing mechanism causes the inerting agent and dust on the filter element to detach from the filter element surface and fall back to the bottom of the dust chamber 5. For example, the back-flushing can also be done by means other than back-flushing, such as mechanical scraping or mechanical vibration, as long as it can achieve the goal of separating the dust and inerting agent from the filter element surface. 9) After the inerting agent 6 and dust on the filter element 3 are cleaned back to the bottom of the dust chamber 5, continue to introduce circulating air into the dust inlet pipe 2, and continue steps 7) and 8), repeating this cycle to further mix the inerting agent and dust evenly. Continue until the amount of dust in the inerting agent 6 is high enough, i.e., the inerting agent is saturated, then remove the dust-containing inerting agent 6 and add new pure inerting agent 6.

Claims

1. A sweeping head, characterized in that: The sweeping head includes a gas inlet pipe (14), a flow guide cavity (13), a feedback pipe (12), and a nozzle (11); the gas inlet pipe (14) and the nozzle (11) are respectively disposed at the top and bottom of the flow guide cavity (13); the gas inlet pipe (14) is connected to the nozzle (11) through the flow guide cavity (13); the feedback pipe (12) is disposed on the side of the flow guide cavity (13); the top of the feedback pipe (12) is connected to the top of the flow guide cavity (13); the bottom of the feedback pipe (12) is connected to the bottom of the flow guide cavity (13).

2. The sweeping head according to claim 1, characterized in that: The feedback tube (12) includes a left feedback tube and a right feedback tube; the left feedback tube and the right feedback tube are symmetrically arranged on the side of the guide cavity (13).

3. The sweeping head according to claim 2, characterized in that: The left feedback tube and the right feedback tube are symmetrically arranged on the side of the guide cavity (13) along the axial direction of the guide cavity (13).

4. The sweeping head according to claim 3, characterized in that: The axis of the left feedback tube, the axis of the guide cavity (13), and the axis of the right feedback tube are in the same plane.

5. The sweeping head according to claim 4, characterized in that: The gas inlet pipe (14) is shaped like an inverted frustum; the flow guide cavity (13) is a gradually expanding structure from top to bottom; the nozzle (11) is a rapidly expanding structure from top to bottom; the area of ​​the top opening of the nozzle (11) is smaller than the area of ​​the bottom expansion of the flow guide cavity (13).

6. The sweeping head according to any one of claims 1-5, characterized in that: The top of the feedback tube (12) is connected to the junction of the gas inlet tube (14) and the guide cavity (13); the bottom of the feedback tube (12) is connected to the junction of the guide cavity (13) and the nozzle (11).

7. A sweeping dust removal device based on the sweeping head as described in claim 6, characterized in that: The sweeping dust removal device includes a gas discharge pipe (1), a dust gas inlet pipe (2), a dust gas chamber (5), a waste bin (7), and a sweeping head (4) as described in claim 6; the dust gas inlet pipe (2) and the gas discharge pipe (1) are respectively connected to the interior of the dust gas chamber (5); the sweeping head (4) is placed inside the dust gas chamber (5) and connected to the end of the dust gas inlet pipe (2); the dust gas chamber (5) is connected to the waste bin (7).

8. The sweeping dust removal device according to claim 7, characterized in that: The sweeping dust removal device also includes a dust treatment device placed inside the dust chamber (5); the dust inlet pipe (2) is connected to the gas outlet pipe (1) through the inside of the dust chamber (5) and the dust treatment device.

9. The sweeping dust removal device according to claim 8, characterized in that: The dust treatment device includes a filter element (3) and a filter element purification mechanism; the filter element (3) is installed inside the dust chamber (5) and divides the dust chamber (5) into a clean air chamber (9) and a reaction chamber; the dust gas inlet pipe (2) is connected to the reaction chamber; the reaction chamber is connected to the waste bin (7); the clean air chamber (9) is connected to the gas outlet pipe (1); the filter element purification mechanism is placed in the clean air chamber (9).

10. The sweeping dust removal device according to claim 9, characterized in that: The filter purification mechanism is a backflushing mechanism (10), a mechanical vibration mechanism, and / or a mechanical scraping mechanism.

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