A pre-filter

Abstract

The present invention proposes a pre-filter, which relates to the technical field of dust pre-filtration. The pre-filter comprises an exhaust gas inlet duct and a filter housing connected to the exhaust gas inlet duct. An air duct connected thereto is provided on the top of the filter housing. A plurality of filter elements arranged in an array are provided within the filter housing. This arrangement significantly improves environmental sanitation, alleviates the problem of easy clogging of the dust removal duct elbow, and prolongs cleaning time when there is less large dust removal waste. It also prolongs the service life of dust bags in the next-level dust treatment system, reduces water waste, mitigates environmental impact, and increases the service life of the dust treatment system.

Description

Technical Field

[0001] The present invention relates to the technical field of dust pre-filtration, in particular to a pre-filter. Background Art

[0002] A filter dust collector is a highly efficient dust removal device that separates solid dust from dust-laden gas by passing it through a filter medium. Electronics manufacturers often use bag filters with woven fiber fabrics as the filter medium.

[0003] However, due to the effect of long-term wind pressure, the filter bags in the bag filter are easily deformed, which affects the ventilation volume. Moreover, as dust accumulates on the filter bags, the dust removal efficiency continues to increase, and the resistance also increases accordingly. When the resistance reaches a certain level, the pressure difference on both sides of the filter bag will squeeze some of the fine dust attached to the filter material, causing a significant decrease in dust removal efficiency. At the same time, excessive dust collector resistance will significantly reduce the amount of gas processed by the dust removal system, affecting the exhaust effect of the production system. Therefore, the filter bags need to be cleaned frequently to maintain high dust removal efficiency. In addition, large particles mixed in the filtered gas cannot continue to move normally when passing through the elbow of the dust removal air duct, often blocking the elbow of the dust removal air duct, which can easily cause damage to mechanical equipment.

[0004] Therefore, how to provide a pre-dust filter that is more conducive to easy cleaning, improves the dust removal effect of the filter dust collector and ensures the personal safety of workers is a technical problem that needs to be solved urgently. Summary of the Invention

[0005] The object of the present invention is to provide a pre-filter, which can solve the problems raised by the above-mentioned background technology in view of the shortcomings of the existing technology.

[0006] The technical solution of this application is implemented as follows:

[0007] The present application provides a pre-filter, including an exhaust gas inlet duct, and a filter housing connected to the exhaust gas inlet duct, and an air guide duct connected to the top of the filter housing is provided; a plurality of filter elements distributed in an array are provided in the filter housing, and a dust exhaust port is provided at the bottom of the filter housing.

[0008] In some technical solutions of the present invention, the filter element includes a mounting shaft and a brush column, one end of the mounting shaft is mounted on the inner wall of the filter housing, the other end of the mounting shaft is passed through the brush column, and the axis of the mounting shaft is coaxial with the axis of the brush column.

[0009] In some technical solutions of the present invention, the mounting shaft is rotatably arranged on the inner wall of the filter housing, and a rotating shaft is provided at the end of the brush column facing away from the mounting shaft. The rotating shaft passes through the inner wall of the filter housing and extends outward. A driving assembly is provided on the outer wall of the filter housing and is transmission-connected to the rotating shaft.

[0010] In some technical solutions of the present invention, the drive assembly includes a drive motor mounted on the filter housing, and a transmission structure is provided on the extended end of the rotating shaft, and the transmission structure is in transmission connection with the output end of the drive motor.

[0011] In some technical solutions of the present invention, the bristles on any two adjacent bristle columns are staggered with each other.

[0012] In some technical solutions of the present invention, a waste box connected to the dust exhaust port is provided at the bottom of the filter housing.

[0013] In some technical solutions of the present invention, an annular filter belt is provided in the filter housing, multiple filter elements are placed in the annular area of ​​the filter belt, and a driving mechanism is provided in the filter housing to drive the filter belt to reciprocate therein.

[0014] In some technical solutions of the present invention, the driving mechanism includes chains respectively arranged on both sides of the filter belt, and multiple sprockets are rotatably provided on the two opposite inner walls of the filter housing, and the sprockets located on the same side of the filter housing are engaged with the chains.

[0015] In some technical solutions of the present invention, an inlet and an outlet are provided on the outer wall of the air guide duct, a partition frame is provided inside the inlet and an outlet, and a filter layer is installed on the partition frame.

[0016] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects:

[0017] The pre-filter is mainly used to filter the dust for the first time, relieve the filtering pressure of the next level filter, and block most of the dust in the front section through the pre-filter to prevent clogging problems.

[0018] At least 15 filter elements are distributed in an array inside the filter housing, and at least 15 filter elements will fill the interior of the filter housing; and 5 filter elements are installed in the filter housing in a horizontal direction and form a group, so that the above-mentioned filter elements will form a 3-layer filter layer structure in the vertical direction inside the filter housing. When the exhaust gas enters the filter housing from the exhaust gas inlet duct, the exhaust gas passes through the filter layer structure formed by the filter element and is then discharged from the air duct. The filter element arranged in this way can perform initial filtration on large particles of dust mixed in the exhaust gas, relieve the filtration pressure of the next-level filter, and improve the filtration effect and filtration efficiency; the filter housing can also be separated from the exhaust gas inlet duct and the air duct, which is convenient for cleaning the filter element later, ensuring the filtration efficiency of the equipment and improving the cleaning efficiency.

[0019] The above settings will greatly improve environmental sanitation; improve the problem of easy clogging of the dust removal air duct elbow; extend the cleaning time when there is less large dust removal waste; achieve one-time discharge of material in a week; in the next-level dust treatment system, the dust collection bag can be cleaned once a year, reducing water waste, reducing the impact on the environment, and increasing the service life of the dust treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the front cross-sectional structure of the present invention;

[0023] Figure 3 It is a top view and cross-sectional combined schematic diagram of the present invention;

[0024] Figure 4 Schematic diagram of the installation structure of the chain and sprocket in the present invention;

[0025] Figure 5 Schematic diagram of the cross-sectional structure of the air guide duct in the present invention;

[0026] Figure 6 Schematic diagram of the partial assembly structure of the filter belt in the present invention;

[0027] Figure 7 Schematic diagram of the installation structure of the filter belt in the filter housing in the invention.

[0028] Icons: 1. Air duct; 2. Filter housing; 3. Waste box; 4. Exhaust air inlet duct; 5. Partition rack; 6. Filter belt; 7. Brush column; 8. Sprocket; 9. Dust outlet; 10. Chain belt; 11. Rotating shaft; 12. Driven gear; 13. Mounting shaft; 14. Filter layer; 15. Filter screen; 16. Connecting net. DETAILED DESCRIPTION

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0031] Example 1

[0032] Please refer to Figure 1-Figure 5 shown.

[0033] This application provides a pre-filter, such as Figure 1 、 Figure 2As shown, it includes an exhaust gas inlet duct 4 and a filter housing 2 connected to the exhaust gas inlet duct 4. The top of the filter housing 2 is provided with an air guide duct 1 connected thereto; a plurality of filter elements distributed in an array are provided in the filter housing 2. The pre-filter provided in this technical solution mainly performs initial filtration on the dust, relieves the filtration pressure of the next-stage filter, and blocks most of the dust in the front section through the pre-filter to prevent clogging problems; in order to solve the problems raised in the background technology and achieve the above-mentioned technical effects, this technical solution forms a filter housing 2 by welding metal plates (steel plates, aluminum alloy plates, etc.). The shape of the filter housing 2 is rectangular or cylindrical, and the dimensions of the filter housing 2 are 60CM long, 40CM wide, and 50CM high, and the filter housing 2 is a closed housing; and the filter housing 2 is installed on the rear side of the exhaust gas inlet duct 4; the exhaust gas inlet duct 4 and one side of the filter housing 2 are detachably connected by a flange and bolts; similarly, the air guide duct 1 is also detachably connected to the top of the filter housing 2 by a flange and bolts. 1, and filter housing 2 is provided with filter element, and filter element is housed in a plurality of filter housings, and filter housing 2 is provided with filter element.

[0034] In some technical solutions of the present invention, such as Figure 3 As shown, the filter element includes a mounting shaft 13 and a brush column 7. One end of the mounting shaft 13 is mounted on the inner wall of the filter housing 2, and the other end of the mounting shaft 13 is passed through the brush column 7. The axis of the mounting shaft 13 is coaxial with the axis of the brush column 7.

[0035] In some technical solutions of the present invention, such as Figure 2 As shown, the bristles on any two adjacent bristle columns 7 are staggered with each other.

[0036] The brush column 7 in the filter element is a round brush with a diameter of 15CM and a length of 39CM, which is smaller than the size of the outer box. The bristles on any two adjacent brush columns 7 cross each other to form a filter layer structure, which plays a role in blocking and filtering dust; the installation shaft 13 is fixedly connected to the end of the brush column 7 by a pin. The installation shaft 13 set in the brush column 7 facilitates the installation of the brush column 7 in the filter housing 2, improves the installation accuracy, and ensures that there will be no large gap between any two adjacent brush columns 7, thereby ensuring the filtration efficiency of the device.

[0037] Example 2

[0038] In some technical solutions of the present invention, such as Figure 3 As shown, the mounting shaft 13 is rotatably arranged on the inner wall of the filter housing 2, and a rotating shaft 11 is provided on the end of the bristle column 7 away from the mounting shaft 13. The rotating shaft 11 passes through the inner wall of the filter housing 2 and extends outward. A driving component is provided on the outer wall of the filter housing 2 and is transmission-connected to the rotating shaft 11.

[0039] Through the above-mentioned components, each brush column 7 is independently rotatably installed in the filter housing 2, and the brush column 7 is driven by the driving component to make a circular motion in the filter housing 2; when the bristles in the two filter elements make relative circular motions, the filter elements can achieve self-cleaning. Through the above-mentioned movement, the dust and large particles of impurities mixed in the bristles can be cleaned to the inner bottom of the filter housing 2, which is convenient for the later cleaning of the dust and impurities collected in the filter housing 2, and avoids the filtering effect of the device being affected by excessive dust and impurities on the filter elements.

[0040] In some technical solutions of the present invention, the drive assembly includes a drive motor mounted on the filter housing 2, and a transmission structure is provided on the extended end of the rotating shaft 11, and the transmission structure is in transmission connection with the output end of the drive motor; the number of drive motors is set according to the number of filter layers 14;

[0041] The first transmission structure is that a driven gear 12 is provided on the extended end of the rotating shaft 11, and a driving gear meshing with the driven gear 12 is provided on the output end of the driving motor. Multiple driven gears 12 located on the same horizontal plane in the horizontal direction mesh with each other, and the driving gear meshes with the driven gear 12 located at the head end or the tail end of the same layer; the set driven gear 12 is installed on the rotating shaft 11 by a pin key, and the set driving motor is installed on the outer wall of the filter housing 2 through a mounting base. The mounting structure of the driving motor is not shown in the figure. The driving motor is an NMB micro two-phase four-wire stepping motor; such a setting can be connected to an external control system to control the operation of the driving motor, ensuring that the equipment automatically starts within a specific time when no filtering is performed, and achieves unmanned operation within a specific time. That is, when removing dust from the air duct, the internal brushes of the pre-dust collector will automatically rotate with each other according to the set running time to achieve the purpose of cleaning.

[0042] The second transmission structure is that a driven pulley is provided on each extension end of the rotating shaft 11, and a driving pulley group connected to the driven pulley via a belt transmission is provided on the output end of the driving motor.

[0043] In some technical solutions of the present invention, a dust outlet 9 is provided at the bottom of the filter housing 2, and a waste bin 3 is provided at the bottom of the filter housing 2, which is connected to the dust outlet 9. The dust outlet 9 provided at the bottom of the filter housing 2 allows dust and other substances to be discharged from the filter housing 2 through the dust outlet 9 during the self-starting cleaning of the filter element, thereby preventing dust and other substances from accumulating in the filter housing 2 and affecting the filtering effect of the device.

[0044] Example 3

[0045] In some technical solutions of the present invention, such as Figure 2 As shown, an annular filter belt 6 is provided in the filter housing 2, and a plurality of filter elements are placed in the annular area of ​​the filter belt 6. The filter belt includes a plurality of filter screens 15 and a plurality of connecting nets 16. A connecting net and a filter screen are installed alternately in sequence, and the filter screens and the connecting nets are sewn together by metal wire. The filter screen 5 has a mesh structure, and the mesh width of the connecting net is larger than the mesh hole of the filter screen, so that the dust cleaned from the bristle column can fall into the waste bin 3. The filter belt 6 is flexible and easy to plasticize. The filter belt 6 first filters large particles to prevent sharp objects in the large particles from hitting the filter element, so that the filtering capacity of the filter element is guaranteed. The layered structure formed by the filter belt 6 and the filter element cooperates with each other to improve the filtering effect.

[0046] Furthermore, a gap is left between the filter belt 6 and the inner wall of the filter housing 2 , but the filter belt 6 is in contact with the inner top wall of the filter housing 2 .

[0047] This arrangement allows the bristles of the brush column 7 to be used to clean large particles on the filter belt 6 to the gap between the filter belt 6 and the filter housing 2, making it easier to clean them later.

[0048] A driving mechanism is provided in the filter housing 2 for driving the filter belt 6 to reciprocate therein.

[0049] In some technical solutions of the present invention, the drive mechanism includes chains disposed on both sides of the filter belt 6. A plurality of sprockets 8 are rotatably mounted on two opposing inner walls of the filter housing 2. The sprockets 8 on the same side of the filter housing 2 engage with the chains. There are eight sprockets 8, each evenly distributed on two opposing inner walls of the filter housing 2.

[0050] Furthermore, a drive wheel is rotatably mounted on the outer wall of the filter housing 2. This drive wheel is connected to one of the sprockets 8 via a coupling. The drive wheel is also connected to the output of a motor external to the filter housing via a belt drive (not shown). The drive motor drives the filter belt in clockwise rotation via the drive wheel. The bristle column 7 also rotates clockwise.

[0051] The chain is in the shape of a belt, which is a flexible rubber belt; the chain is connected to the filter belt 6 by a buckle, so that the filter belt 6 and the chain can make a circular motion in the filter housing 2 along the circumference of the filter housing 2; the sprocket 8 is engaged with the chain of the filter belt 6 on the same side and provides support for the filter belt 6, ensuring that the filter belt 6 operates normally in the filter housing 2, and cooperates with the layered structure formed by the filter element to improve the filtering effect.

[0052] Preferably, the two sprockets 8 can be respectively arranged at the two ends of the filter element located at the four vertex corners inside the filter housing 2, that is, the pulley is installed on the mounting shaft or the rotating shaft, and the bristles of the brush columns 7 located at the four vertex corners inside the filter housing 2 are partially embedded in the filter holes of the filter belt 6; in this way, the self-rotation of the filter element can be used to drive the connection to make a circular motion inside the filter housing 2, and the bristles of the brush columns 7 can be used to self-clean the filter belt 6.

[0053] In summary, the working principle of this device is as follows: in the initial state, two of the filter screens 15 in the filter belt 6 are respectively placed at the connection point between the filter housing and the exhaust air inlet duct and at the connection point between the filter housing and the air duct 1, so that the air inlet and air outlet of this device can be filtered; or one of the filter screens 15 in the filter belt 6 is respectively placed at the connection point between the filter housing and the air duct 1; and one of the connecting nets 16 is just placed at the dust outlet; so that the dust cleaned from the brush column 7 passes through the connecting net and falls into the waste bin 3; in this way, when the driving mechanism drives the filter belt 6 to move in the filter housing, multiple filter screens 15 can periodically filter the connection point between the filter housing 2 and the exhaust air inlet duct or the filter housing 2 and the air duct The connection between the filter housing 2 and the exhaust air inlet duct is blocked; and one of the connecting nets 16 is also located at the dust outlet; because the bristles of the brush columns 7 at the four top corners in the filter housing 2 are partially embedded in the filter holes of the filter belt 6, when the device is self-cleaning, the brush columns 7 can just clean the filter screen 15 that is not placed at the connection between the filter housing 2 and the exhaust air inlet duct or the connection between the filter housing and the air guide duct 1, so that the local filter screen 15 remains locally clean, so as to continue to filter the connection between the filter housing 2 and the air guide duct 1 or the connection between the filter housing 2 and the exhaust air inlet duct at one time, and the filter screen 15 is used alternately back and forth, thereby ensuring that the filter screen 15 maintains a good filtering ability and improves the filtering effect.

[0054] In some technical solutions of the present invention, an inlet and outlet are formed on the outer wall of the air duct 1, and a partition frame 5 is installed inside the inlet and outlet, and a filter layer 14 is mounted on the partition frame 5. This arrangement prevents the exhaust gas from being discharged directly from the air duct 1 without passing through the filter element in the filter housing 2, which would cause the filtering effect of the device to be poor.

[0055] The above settings will greatly improve environmental sanitation; improve the problem of easy clogging of the dust removal air duct elbow; extend the cleaning time when there is less large dust removal waste; achieve one time of discharge per week; the dust collection bags in the next-level dust treatment system can be left uncleaned for a long time, reducing water waste, reducing the impact on the environment, and increasing the service life of the dust treatment system.

[0056] The pre-filter has the function of self-cleaning, which makes cleaning simple and greatly reduces the workload of operators.

[0057] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pre-filter, comprising an exhaust gas inlet duct, characterized in that: It also includes a filter housing connected to the exhaust gas inlet duct, and an air guide duct connected to the top of the filter housing is provided; a plurality of filter elements distributed in an array are provided in the filter housing; The filter element includes a mounting shaft and a bristle column, one end of the mounting shaft is mounted on the inner wall of the filter housing, the other end of the mounting shaft is passed through the bristle column, and the axis of the mounting shaft is coaxial with the axis of the bristle column; The bristles on any two adjacent bristle columns are interlaced with each other; The brush column can clean the filter screen that is not placed at the connection between the filter housing and the exhaust air inlet duct or the connection between the filter housing and the air duct; The filter housing is provided with an annular filter belt, and the plurality of filter elements are placed in the annular area of ​​the filter belt; The filter belt includes a plurality of filter screens and a plurality of connecting nets, and the connecting nets and the filter screens are installed alternately in sequence; The filter housing is provided with a driving mechanism for driving the filter belt to reciprocate inside the filter housing.

2. A pre-filter according to claim 1, characterized in that: The mounting shaft is rotatably arranged on the inner wall of the filter housing, and a rotating shaft is provided at one end of the bristle column away from the mounting shaft. The rotating shaft extends outward after passing through the inner wall of the filter housing, and a driving assembly connected to the rotating shaft is provided on the outer wall of the filter housing.

3. A pre-filter according to claim 2, characterized in that: The driving assembly includes a driving motor mounted on the filter housing. A transmission structure is provided on the extending end of the rotating shaft. The transmission structure is in driving connection with the output end of the driving motor.

4. A pre-filter according to claim 1, characterized in that: A dust discharge port is provided at the bottom of the filter housing, and a waste box communicated with the dust discharge port is provided at the bottom of the filter housing.

5. A pre-filter according to claim 1, characterized in that: The driving mechanism includes chains respectively arranged on both sides of the filter belt, and multiple sprockets are rotatably provided on the two opposite inner walls of the filter housing. The sprockets and chains located on the same side of the filter housing are engaged with each other, and the sprockets are connected to the output end belt transmission of the driving motor.

6. A pre-filter according to claim 1, characterized in that: An inlet and an outlet are provided on the outer side wall of the air guide duct, a partition frame is provided in the inlet and an outlet, and a filter layer is installed on the partition frame.

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