A dust removal filter tank

Abstract

The present invention relates to a dust removal filter tank, comprising: a tank body, provided with a first air inlet and a first air outlet, a second air inlet and a second air outlet; a partition carrier, dividing the tank body into a closed upper chamber and a lower chamber, the first air inlet and the second air outlet are arranged in the lower chamber, and the second air inlet and the first air outlet are arranged in the upper chamber; a filter bag, comprising a first filter layer and a second filter layer, the second filter layer can be turned over and enter the first filter layer of the upper chamber and the lower chamber respectively; the first air inlet and the first air outlet are opened to form an airflow from bottom to top, the second filter layer is blown into the upper chamber, and impurities mixed in the exhaust gas are deposited in the second filter layer; the second air inlet and the second air outlet are opened to form an airflow from top to bottom, the second filter layer is blown into the lower chamber, and the impurities are blown off with the airflow. The dust removal filter tank disclosed by the present invention can realize the turning over of the filter layer structure through airflow reversal, improve the cleaning efficiency of the filter bag, and extend its service life.

Description

Technical Field

[0001] The invention relates to the technical field of gas purification, in particular to a dust removal filter tank. Background Art

[0002] The dust removal filter tank is used in the gas filtration of single crystal silicon pulling. Its function is to filter out a large amount of oxides carried in the gas. Among them, the filter bag in the filter tank plays a filtering role. The filter bag is woven from dense mesh fiber material and belongs to the filter net.

[0003] Traditional dust removal filters usually include a single air inlet and outlet, and use fixed filter media to capture particulate matter in the gas. However, this design has some significant limitations: first, due to the long-term exposure of the filter medium to polluted air, it is easy to become clogged, reducing the filtration efficiency; second, cleaning impurities deposited on the filter medium often requires stopping the entire system, resulting in production interruptions or increased maintenance costs.

[0004] In recent years, although some improved dust removal filter tanks have emerged, such as filter tanks with back-blowing systems, which clean the filter bags by alternately switching the direction of the airflow, their cleaning relies on high-pressure pulse airflow, which consumes a lot of energy and has a great impact on the flexible filter bags, causing the filter layer fibers to break. These systems still face problems such as poor filter bag cleaning effects, and they cannot perform normal filtering work when back-blowing is in progress. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the dust removal filter tank is easily clogged, resulting in a decrease in filtration efficiency, and to provide a dust removal filter tank that can realize the flipping of the filter layer structure through air flow reversal, thereby improving the cleaning efficiency of the filter bag and extending its service life.

[0006] In order to solve the above technical problems, the present invention provides a dust removal filter tank, comprising:

[0007] A tank body, wherein the tank body is provided with a first air inlet and a first air outlet, a second air inlet and a second air outlet;

[0008] A partition carrier plate is arranged in the tank body, the partition carrier plate divides the tank body into a closed upper chamber and a lower chamber, the first air inlet and the second air outlet are arranged in the lower chamber, and the second air inlet and the first air outlet are arranged in the upper chamber;

[0009] A filter bag is arranged on the partition carrier, the filter bag comprises a first filter layer protruding toward the upper chamber and the lower chamber respectively and a second filter layer arranged in the first filter layer, a through hole is opened at a position of the partition carrier corresponding to the filter bag, so that the first filter layer located in the upper chamber and the lower chamber are connected, and the second filter layer can be turned over and enter the first filter layer of the upper chamber and the lower chamber respectively;

[0010] Wherein: the first air inlet is connected with the exhaust gas equipment, the first air inlet and the first air outlet are opened to form an airflow from bottom to top, the second filter layer is blown into the upper chamber, and the impurities mixed in the exhaust gas are deposited in the second filter layer; after the exhaust gas is discharged, the second air inlet and the second air outlet are opened to form an airflow from top to bottom, the second filter layer is blown into the lower chamber, and the impurities are blown off with the airflow.

[0011] In one embodiment of the present invention, a supporting structure is provided on the inner wall of the first filter layer for enhancing the mechanical strength of the first filter layer, so that the first filter layer is fixedly disposed in the upper chamber and the lower chamber and does not swing with the airflow, and the moving direction of the second filter layer is limited by the first filter layer.

[0012] In one embodiment of the present invention, the second filter layer is a flexible membrane, and the peripheral portion of the second filter layer is connected to the first filter layer through an elastic component. The elastic component can be stretched under the action of airflow to allow the membrane to enter the upper chamber or the lower chamber respectively.

[0013] In one embodiment of the present invention, the first air inlet and the first air outlet, the second air inlet and the second air outlet are all provided with switch valves to control the opening and closing of the first air inlet and the first air outlet, the second air inlet and the second air outlet. After the first air inlet and the first air outlet are opened, an airflow from bottom to top can be formed in the tank body. After the second air inlet and the second air outlet are opened, an airflow from top to bottom can be formed in the tank body.

[0014] In one embodiment of the present invention, regulating valves are provided at the first air inlet and the second air inlet for regulating the amount of air entering the tank body.

[0015] In one embodiment of the present invention, pressure sensors are provided in both the upper chamber and the lower chamber to detect the pressure difference between the upper chamber and the lower chamber. The greater the pressure difference between the upper chamber and the lower chamber, the more impurities deposited in the second filter layer.

[0016] Wherein: when the first air inlet and the first air outlet are in an open state, the regulating valve regulates the gas flow of the first air inlet to gradually increase as the pressure difference increases;

[0017] When the second air inlet and the second air outlet are in an open state, the regulating valve regulates the gas flow of the second air inlet to gradually decrease as the pressure difference decreases.

[0018] In one embodiment of the present invention, a guide plate is provided inside the tank body, and the guide plate is provided close to the first air inlet and the second air inlet, and the guide plate guides the airflow entering the first air inlet and the second air inlet to flow in the tank body toward the partition carrier.

[0019] In one embodiment of the present invention, a dust collecting box is arranged at the bottom of the tank body, the dust collecting box detachably closes the tank body, and the dust collecting box is used to carry impurities falling off from the second filter layer.

[0020] In one embodiment of the present invention, the partition carrier is rotatably disposed in the tank body, and the partition carrier is provided with closing plates extending toward the upper chamber and the lower chamber respectively, the closing plates extending upward to the top of the tank body and downward to the bottom of the tank body, the closing plates dividing the tank body into a closed filtering area and a discharging area, and the closing plates dividing the filter bags on the partition carrier into the filtering area and the discharging area;

[0021] Wherein: the first air inlet and the first air outlet are arranged in the filtering area, the second air inlet and the second air outlet are arranged in the unloading area, the filtering area and the unloading area can work synchronously, and after rotating the partition carrier 180°, the filter bag can be switched between the filtering area and the unloading area.

[0022] In one embodiment of the present invention, the partition carrier and the closing plate are integrally formed, and sealing members are provided at the edges of the partition carrier and the closing plate that are in contact with the can body.

[0023] The above technical solution of the present invention has the following advantages compared with the prior art:

[0024] The dust removal filter bag of the present invention realizes the functional change of the filtering and dust cleaning process by bidirectional airflow switching (the first air inlet / air outlet and the second air inlet / air outlet are alternately enabled) and the airflow direction is changed to drive the second filter layer to flip, thereby realizing the cleaning of the filter screen and preventing the problem of reduced filtering efficiency due to impurity deposition;

[0025] The first filter layer not only plays a preliminary filtering role and prevents excessive impurities from clogging the second filter layer, but also serves as a fixed support structure, which can limit the movement direction of the second filter layer with the airflow, and ensure that the second filter layer is flipped between the upper chamber and the lower chamber with the airflow. By flipping the second filter layer, it can be ensured that when filtering, there is reserved space for impurities. When cleaning, impurities can be pushed out to prevent impurities from accumulating in the filter layer, thereby improving cleaning efficiency. In addition, compared with traditional pulse backblowing technology, there is no need to use a compressed air source, and energy consumption is reduced by 40%-50%. It also avoids the problem of fiber breakage in the filter layer due to high-pressure impact, and can extend the service life of the filter bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 It is a schematic diagram of the structure of the dust removal filter bag in the prior art;

[0028] Figure 2 1 is a schematic structural diagram of a dust removal filter bag according to a first embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the structure of the present invention in which the first filter layer and the second filter layer are connected by an elastic component;

[0030] Figure 4 It is a structural schematic diagram of the second embodiment of the dust removal filter bag of the present invention.

[0031] Explanation of the reference numerals in the drawings in the specification: 1. tank body; 11. first air inlet; 12. first air outlet; 13. second air inlet; 14. second air outlet; 15. upper chamber; 16. lower chamber; 17. filter area; 18. unloading area; 2. partition tray; 3. filter bag; 31. first filter layer; 32. second filter layer; 33. elastic component; 4. closing plate. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0033] As mentioned above, refer to Figure 1As shown, during the single crystal silicon pulling process, the gas carrying oxides is discharged through the exhaust pipe at the bottom and enters the dust removal filter tank, where most of the oxides are trapped on the filter bags inside the dust removal filter tank, and the filtered gas is then discharged from the dust removal filter tank; conventional dust removal filter tanks need to be disassembled and cleaned of oxide deposits on the filter bags after the vacuum pump is working at full load, and filter bags that are difficult to clean need to be replaced, which increases the maintenance time of the furnace body on the one hand, and increases the use cost of the filter bags on the other hand.

[0034] Based on the above-mentioned prior art and analyzing the problems therein, the present invention improves the existing dust removal filter tank and provides a new type of dust removal filter tank, which has a filter bag that can realize the flipping of the filter layer structure through reversing airflow, thereby realizing the functional change of the filtering and cleaning process. After the filtration is completed, the filter net can be efficiently cleaned, and the problem of reduced filtration efficiency due to impurity deposition can be prevented. The structure of the dust removal filter tank of the present invention is further explained in conjunction with specific embodiments below. Embodiment 1

[0035] Reference Figure 2As shown, the dust removal filter tank of the present invention comprises: a tank body 1, a partition carrier 2 arranged in the tank body 1, and a filter bag 3 arranged on the partition carrier 2, wherein: the tank body 1 is a closed chamber, and a total of four air ports are arranged on the side wall of the tank body 1, namely a first air inlet 11 and a first air outlet 12, a second air inlet 13 and a second air outlet 14, the first air inlet 11 and the first air outlet 12 are used in conjunction with each other, the second air inlet 13 and the second air outlet 14 are used in conjunction with each other, and the first air inlet 11 and the second air inlet 13 are connected to each other. The gas inlet 11 and the second gas outlet 14 are respectively discharged from the first gas outlet 12 and the second gas outlet 14; the partition carrier 2 is horizontally arranged in the tank body 1, and the partition carrier 2 divides the tank body 1 into a closed upper chamber 15 and a lower chamber 16, the first gas inlet 11 and the second gas outlet 14 are arranged in the lower chamber 16, and the second gas inlet 13 and the first gas outlet 12 are arranged in the upper chamber 15; the filter bag 3 is arranged on the partition carrier 2, and a plurality of filter bags 3 are arranged on the partition carrier 2 according to the requirements of cleaning efficiency, each Each of the filter bags 3 includes a first filter layer 31 protruding toward the upper chamber 15 and the lower chamber 16, respectively, and a second filter layer 32 arranged in the first filter layer 31. A through hole is opened at a position of the partition carrier 2 corresponding to the filter bag 3, so that the first filter layer 31 located in the upper chamber 15 and the lower chamber 16 are connected, and the second filter layer 32 can be turned over and enter the first filter layer 31 of the upper chamber 15 and the lower chamber 16 respectively; in this way, when the first air inlet 11 and the first air outlet 12 are used, gas is introduced into the first air inlet 11 and first enters the In the lower chamber 16, the continuously introduced gas will pass through the through holes on the partition carrier 2 under the action of pressure, forming an airflow from bottom to top, and at the same time can blow the second filter layer 32 into the first filter layer 31 of the upper chamber 15. Similarly, when using the second air inlet 13 and the second air outlet 14, gas is introduced into the second air inlet 13 and first enters the upper chamber 15. The continuously introduced gas will pass through the through holes on the partition carrier 2 under the action of pressure, forming an airflow from top to bottom, and at the same time can blow the second filter layer 32 into the first filter layer 31 of the lower chamber 16.

[0036] As mentioned above, the dust removal filter tank described in the present invention is used for waste gas treatment in the process of single crystal silicon pulling. The first filter layer 31 is a grid-like structure, which is used to filter large particles of impurities to prevent the impurities from being too large and causing large-area blockage of the mesh of the second filter layer 32. The second filter layer 32 is used to filter fine impurities such as oxides; therefore, the first air inlet 11 of the present invention is connected to the exhaust gas equipment, and the first air inlet 11 and the first air outlet 12 are opened. At this time, the second air inlet 13 and the second air outlet 14 are in a closed state, and the exhaust gas doped with impurities discharged from the exhaust device enters the lower chamber 16, and forms an airflow from bottom to top, blowing the second filter layer 32 into the first filter layer 31 of the upper chamber 15, which can form a groove-shaped accommodation space, and the gas can pass through the filter bag 3, and larger impurities are directly Outside the first filter layer 31 isolated in the lower chamber 16, fine impurities such as oxides doped in the exhaust gas are deposited in the second filter layer 32. Since the second filter layer 32 is turned upward, a groove-shaped accommodating space is formed, which can collect impurities, thereby realizing gas filtration; after the exhaust gas is discharged, the second air inlet 13 and the second air outlet 14 are opened. At this time, the first air inlet 11 and the first air outlet 12 are in a closed state. Clean air is introduced into the second air inlet 13 to form an airflow from top to bottom, which blows the second filter layer 32 into the lower chamber 16. At this time, the impurities deposited in the accommodating space will be turned outward. Without the protection of the accommodating space, they will fall off from the second filter layer 32 under the action of the airflow, thereby realizing the cleaning of the second filter layer 32, and larger impurities will also fall off from the first filter layer 31.

[0037] The dust removal filter bag 3 described in the present invention switches the airflow in two directions, i.e., the first air inlet 11 and the first air outlet 12, the second air inlet 13 and the second air outlet 14 are alternately activated, and the airflow direction change is used to drive the second filter layer 32 to flip. When the second filter layer 32 flips to the upper chamber 15, a groove-shaped accommodating space can be formed, which is convenient for impurities to be deposited therein, thereby realizing rapid collection of impurities. When the second filter layer 32 flips to the lower chamber 16, all impurities are exposed to the outside of the second filter layer 32, and under the action of the airflow, they can easily fall off from the second filter layer 32, thereby improving the cleaning efficiency and cleaning rate of the second filter layer 32.

[0038] In the present embodiment, the first filter layer 31 is provided as a fixed support structure, which can limit the moving direction of the second filter layer 32 with the airflow, and ensure that the second filter layer 32 can only be turned over between the upper chamber 15 and the lower chamber 16 with the airflow, and will not swing in the tank body 1 with the airflow. On the one hand, it can prevent the swinging filter bags 3 from piling up, thereby affecting the passage of the airflow and causing an increase in resistance; on the other hand, after the flipping of the second filter layer 32, the deposited impurities are directly exposed to the outside, which is very easy to clean. Compared with the traditional pulse backblowing technology, there is no need to use a compressed air source, and the energy consumption is reduced by 40%-50%. It also avoids the problem of fiber breakage of the filter layer due to high-pressure impact, and can extend the service life of the filter bag 3.

[0039] Specifically, in actual use, in order to increase the structural strength of the first filter layer 31 and prevent it from swinging under the action of airflow, a supporting structure is provided on the inner wall of the first filter layer 31 along the extension direction of the first filter layer 31, such as a support bar or a support frame, which can fix the first filter layer 31 to enhance the mechanical strength of the first filter layer 31, so that the first filter layer 31 is fixedly arranged in the upper chamber 15 and the lower chamber 16 and does not swing with the airflow, thereby limiting the moving direction of the second filter layer 32 through the first filter layer 31.

[0040] Specifically, the second filter layer 32 is a flexible membrane, which has a certain degree of ductility, so that it can be turned over with the airflow. Figure 3 As shown, the peripheral portion of the second filter layer 32 is connected to the first filter layer 31 through an elastic component 33. The elastic component 33 can be stretched under the action of airflow, so that the diaphragm enters the upper chamber 15 or the lower chamber 16 respectively. The elastic component 33 is provided to connect the second filter layer 32, so as to ensure that the diaphragm can be restored to the initial position after each operation, and can be quickly turned over after the reverse airflow is introduced; and the use of a flexible diaphragm and its matching elastic component 33 design reduces the damage to the filter layer caused by mechanical stress. Compared with the traditional rigid structure, this flexible connection method is more adaptable to frequent deformation requirements, thereby extending the service life of the filter layer.

[0041] Specifically, in order to achieve the above effect, the flexible membrane of the second filter layer 32 needs to be made of materials with good flexibility and durability, such as polyester fiber, PTFE (polytetrafluoroethylene), etc.; these materials can not only effectively capture particulate matter, but also have sufficient flexibility to cope with repeated stretching and compression.

[0042] The elastic component 33 is an annular elastic body, which is arranged between the first filter layer 31 and the second filter layer 32 and is used to connect the first filter layer 31 and the second filter layer 32. It does not allow airflow to pass through, ensuring that no impurities pass through. However, it can allow the flexible diaphragm to move freely into the upper chamber 15 or the lower chamber 16 under the action of airflow and stretch up and down, and can help the flexible diaphragm to quickly reset when there is no airflow.

[0043] Specifically, as mentioned above, in actual use, the first air inlet 11 and the first air outlet 12 are used in combination, and the second air inlet 13 and the second air outlet 14 are used in combination. The first air inlet 11 and the second air inlet 13 cannot be opened at the same time, which will form an unstable airflow. At the same time, it is also necessary to ensure that when one group of air inlets / outlets is in use, the other group of air inlets / outlets is in a closed state. Therefore, in this embodiment, in order to control the opening and closing of the first air inlet 11 and the first air outlet 12, the second air inlet 13 and the second air outlet 14, the first air inlet 11 and the first air outlet 12, the second air inlet 13 and the second air outlet 14 are all opened. A switch valve is provided, through which the first air inlet 11 and the first air outlet 12, the second air inlet 13 and the second air outlet 14 are turned on and off. After the first air inlet 11 and the first air outlet 12 are opened by the switch valve, an airflow from bottom to top can be formed in the tank body 1. At this time, the second air inlet 13 and the second air outlet 14 are closed by the switch valve to ensure the stability of the airflow direction in the tank. Similarly, after the second air inlet 13 and the second air outlet 14 are opened by the switch valve, the first air inlet 11 and the first air outlet 12 are closed by the switch valve, so that a stable airflow from top to bottom can be formed in the tank body 1.

[0044] In actual use, it is necessary not only to control the on and off of the airflow but also to control the size of the airflow. Therefore, regulating valves are also provided at the first air inlet 11 and the second air inlet 13 to adjust the amount of air entering the tank body 1. By precisely controlling the air flow speed and flow rate entering the tank body 1, it can be ensured that the filter bag 3 operates under the best working conditions. For example, different impurities may require different air flow speeds to achieve the most effective capture. The regulating valve can be adjusted according to actual needs to improve the overall filtration efficiency.

[0045] In addition, the regulating valve shown can reasonably adjust the air flow, which helps to maintain the system in an efficient working state and avoid unnecessary energy consumption. For example, when dealing with low-concentration dust, the air flow speed can be appropriately reduced to save energy; and under high-load conditions, sufficient ventilation can be ensured by increasing the air flow.

[0046] In summary, the presence of the regulating valve enables the dust removal filter tank to flexibly respond to specific requirements in different application scenarios. Whether it is waste gas treatment in industrial production or air purification in a specific environment, various complex working conditions can be met by adjusting the air flow.

[0047] Specifically, common regulating valves include butterfly valves, ball valves, gate valves, etc. It is crucial to select the appropriate type according to the specific process requirements. For the present invention, considering the need to finely control the air flow rate, it is recommended to use valves with linear regulation characteristics, such as electric regulating butterfly valves or pneumatic diaphragm regulating valves, which can accurately adjust the opening size through external signals.

[0048] Furthermore, in order to better play the role of the regulating valve and realize automatic control and adjustment of the regulating valve, pressure sensors are provided in the upper chamber 15 and the lower chamber 16 to detect the pressure difference between the upper chamber 15 and the lower chamber 16. The greater the pressure difference between the upper chamber 15 and the lower chamber 16, the more impurities are deposited in the second filter layer 32.

[0049] Wherein: when the first air inlet 11 and the first air outlet 12 are in an open state, the regulating valve adjusts the gas flow of the first air inlet 11 to gradually increase as the pressure difference increases. When impurities are deposited in the second filter layer 32, a larger gas flow is required to ensure that the gas can pass through the second filter layer 32 to achieve gas filtering;

[0050] Similarly, when the second air inlet 13 and the second air outlet 14 are in the open state, the regulating valve adjusts the gas flow of the second air inlet 13 to gradually decrease as the pressure difference decreases. When cleaning the second filter layer 32, in the initial state, impurities are attached to the second filter layer 32, and the pressure difference between the upper chamber 15 and the lower chamber 16 is large, providing a high-intensity air flow to ensure that the impurities can be blown off. As the pressure difference between the upper chamber 15 and the lower chamber 16 becomes smaller, it means that the impurities are blown off. At this time, gradually reducing the gas flow can reduce energy consumption.

[0051] A guide plate is arranged inside the tank body 1, and the guide plate is arranged close to the first air inlet 11 and the second air inlet 13. The guide plate guides the airflow introduced by the first air inlet 11 and the second air inlet 13 to flow in the tank body 1 toward the partition carrier 2. In an actual factory, since the dust removal filter tank needs to be used in conjunction with other equipment, considering the overall equipment layout, the first air inlet 11 and the second air inlet 13 are likely to be opened on the side wall of the tank body 1, then the airflow introduced through the first air inlet 11 and the second air inlet 13 has an initial flow direction, and the airflow desired in the present application is from top to bottom or from bottom to top, so as to quickly blow over the second filter layer 32 to achieve the filtering and cleaning effects. Therefore, by setting the guide plate, the direction of the airflow can be controlled. Regardless of the position of the air inlet, the airflow can flow toward the partition carrier 2 through the guide plate, which can reduce unnecessary energy loss and enable the system to achieve efficient dust removal effects with lower energy consumption.

[0052] Specifically, the guide plate should be customized according to the specific shape and size of the tank body 1, and usually adopts a plate structure with a certain curvature to guide the airflow to turn smoothly; considering the directionality and intensity differences of the airflow, one or more guide plates can be set near each air inlet, and their angles and positions can be adjusted according to actual needs.

[0053] Specifically, a second air outlet 14 is provided on the tank body 1 of the present embodiment. During actual use, most impurities will be discharged from the second air outlet 14 along with the airflow, but some impurities will still be deposited at the bottom of the tank body 1. Long-term accumulation will cause more and more impurities in the lower chamber 16, which will easily affect the filtering effect of the filter bag 3 and cause secondary pollution. Therefore, in the present embodiment, a dust box is provided at the bottom of the tank body 1, and the dust box can detachably seal the tank body 1. The dust box is used to carry impurities fallen off from the second filter layer 32. The design of the dust box makes it easier to clean the deposited dust and impurities. The detachable design only requires the dust box to be taken out and emptied regularly to complete the maintenance work. There is no need to perform complicated disassembly or shutdown operations on the entire system, which greatly saves time and labor costs.

[0054] Specifically, the dust box should have sufficient volume to store impurities within a certain period, but it should not be too large so as not to affect the overall layout. Normally, the shape of the dust box should match the bottom of the tank body 1. Common shapes are square and round. It is recommended to use corrosion-resistant and impact-resistant materials. Embodiment 2

[0055] During actual use, the inventors found that in the process of cleaning the filter screen, since it is necessary to form an airflow in the opposite direction, there is no way to filter the exhaust gas while cleaning the filter bag 3. However, in the gas filtration process of a single crystal silicon pulling process, the amount of exhaust gas generated cannot be removed at one time by the dust removal filter tank in Example 1. When the exhaust gas has not been completely removed, the deposited impurities will block the second filter layer 32. At this time, the second filter layer 32 needs to be cleaned first, and the production of single crystal silicon needs to be stopped. Production can only be resumed after cleaning. Although the structure of Example 1 of the present invention can complete cleaning quickly compared to the prior art, it will also cause the suspension of single crystal silicon production.

[0056] To achieve continuous gas filtration, refer to Figure 4 As shown, on the basis of the above-mentioned embodiment 1, combined with the actual usage, the inventor has made further optimization and improvement to the dust removal filter tank of embodiment 1: in this embodiment, the partition carrier 2 is rotatably arranged in the tank body 1, and a closing plate 4 extending to the upper chamber 15 and the lower chamber 16 respectively is arranged on the partition carrier 2, and the closing plate 4 extends upward to the top of the tank body 1 and downward to the bottom of the tank body 1, and the tank body 1 is divided into a closed filtering area 17 and a discharge area 18 by the closing plate 4;

[0057] Wherein: the first air inlet 11 and the first air outlet 12 are arranged in the filter area 17, the second air inlet 13 and the second air outlet 14 are arranged in the unloading area 18, and the filter area 17 and the unloading area 18 can work synchronously. While filtering operation is being performed in one area, impurities can be cleaned or the filter bag 3 can be replaced in another area. This ensures the uninterrupted operation of the system and improves the overall work efficiency. When it is necessary to switch the functional area of ​​the filter bag 3, the filter bag 3 can be switched between the filter area 17 and the unloading area 18 after rotating the angle of the partition carrier 2 to 180°. After the switching is completed, the filter bag 3 originally located in the filter area 17 enters the unloading area 18, the second filter layer 32 can be blown over, and the impurities deposited in the second filter layer 32 will be blown off, thereby cleaning the filter bag 3. At the same time, the filter bag 3 originally located in the unloading area 18 enters the filter area 17. In the filter area 17, the cleaned second filter layer 32 can be blown over, and impurities will be deposited in the groove-shaped accommodating space formed by the second filter layer 32 to collect the impurities. During the rotation of the partition carrier 2, there is no need to stop the machine. When the partition carrier 2 rotates to make the closing plate 4 pass through the first air inlet 11 and the second air inlet 13, the function of the filter bag 3 can be switched. During the entire exhaust gas filtration process, no matter how much exhaust gas is discharged, there is no need to stop the machine to switch the direction of the airflow, and the entire exhaust gas filtration process can be completed.

[0058] Specifically, in this embodiment, in order to prevent the first air inlet 11 and the second air inlet 13, and the first air outlet 12 and the second air outlet 14 from appearing in the same area (the filtering area 17 and the unloading area 18), the first air inlet 11 and the second air inlet 13 need to be symmetrically arranged on the two side walls of the tank body 1, and the first air outlet 12 is arranged directly above the first air inlet 11 in the vertical direction, and the second air outlet 14 is arranged directly below the second air inlet 13 in the vertical direction, so that during the rotation of the closing plate 4, both ends of the closing plate 4 can pass through the first air inlet 11 and the second air inlet 13, as well as the first air outlet 12 and the second air outlet 14 at the same time, to ensure that the first air inlet 11 and the second air inlet 13 are not in the same closed area.

[0059] Specifically, the rotation of the partition carrier 2 can be achieved through a rotating shaft, a worm gear mechanism and a rotating drive source, or through a gear transmission mechanism, which belongs to the prior art and can be rotated in different driving modes according to actual conditions, and is not further limited here.

[0060] In the present embodiment, the partition tray 2 and the closing plate 4 are provided to separate the space in the tank body 1, and the sealing between the partition tray 2, the closing plate 4 and the tank body 1 needs to be ensured. Therefore, in the present embodiment, the partition tray 2 and the closing plate 4 are integrally formed, which not only ensures that the closing plate 4 can rotate with the partition tray 2, but also realizes the sealing between the partition tray 2 and the closing plate 4. In addition, the edges of the partition tray 2 and the closing plate 4 that are in contact with the tank body 1 are provided with sealing members, which can further improve the sealing effect and ensure that the airflow between the filtration area 17 and the unloading area 18 will not be interfered, while also ensuring that the airflow can only pass through the filter bag 3.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A dust removal filter tank, characterized in that: include: A tank body, wherein the tank body is provided with a first air inlet and a first air outlet, a second air inlet and a second air outlet; A partition carrier plate is arranged in the tank body, the partition carrier plate divides the tank body into a closed upper chamber and a lower chamber, the first air inlet and the second air outlet are arranged in the lower chamber, and the second air inlet and the first air outlet are arranged in the upper chamber; A filter bag is arranged on the partition carrier, the filter bag comprises a first filter layer protruding toward the upper chamber and the lower chamber respectively and a second filter layer arranged in the first filter layer, a through hole is opened at a position of the partition carrier corresponding to the filter bag, so that the first filter layer located in the upper chamber and the lower chamber are connected, and the second filter layer can be turned over and enter the first filter layer of the upper chamber and the lower chamber respectively; Wherein: the first air inlet is connected with the exhaust gas equipment, the first air inlet and the first air outlet are opened to form an airflow from bottom to top, the second filter layer is blown into the upper chamber, and the impurities mixed in the exhaust gas are deposited in the second filter layer; after the exhaust gas is discharged, the second air inlet and the second air outlet are opened to form an airflow from top to bottom, the second filter layer is blown into the lower chamber, and the impurities are blown off with the airflow.

2. The dust removal filter tank according to claim 1, characterized in that: A support structure is arranged on the inner wall of the first filter layer, which is used to enhance the mechanical strength of the first filter layer, so that the first filter layer is fixedly arranged in the upper chamber and the lower chamber and does not swing with the airflow, and the moving direction of the second filter layer is limited by the first filter layer.

3. The dust removal filter tank according to claim 1, characterized in that: The second filter layer is a flexible membrane, and the peripheral part of the second filter layer is connected to the first filter layer through an elastic component. The elastic component can be stretched under the action of airflow to make the membrane enter the upper chamber or the lower chamber respectively.

4. The dust removal filter tank according to claim 1, characterized in that: The first air inlet and the first air outlet, the second air inlet and the second air outlet are all provided with switch valves to control the opening and closing of the first air inlet and the first air outlet, the second air inlet and the second air outlet. When the first air inlet and the first air outlet are opened, an airflow from bottom to top can be formed in the tank body. When the second air inlet and the second air outlet are opened, an airflow from top to bottom can be formed in the tank body.

5. The dust removal filter tank according to claim 1, characterized in that: The first air inlet and the second air inlet are provided with regulating valves for adjusting the amount of air entering the tank body.

6. The dust removal filter tank according to claim 5, characterized in that: A pressure sensor is provided in each of the upper chamber and the lower chamber, for detecting the pressure difference between the upper chamber and the lower chamber. The greater the pressure difference between the upper chamber and the lower chamber, the more impurities deposited in the second filter layer. Wherein: when the first air inlet and the first air outlet are in an open state, the regulating valve regulates the gas flow of the first air inlet to gradually increase as the pressure difference increases; When the second air inlet and the second air outlet are in an open state, the regulating valve regulates the gas flow of the second air inlet to gradually decrease as the pressure difference decreases.

7. The dust removal filter tank according to claim 1, characterized in that: A guide plate is disposed inside the tank body, and the guide plate is disposed close to the first air inlet and the second air inlet. The guide plate guides the airflow entering the first air inlet and the second air inlet to flow toward the partition carrier in the tank body.

8. The dust removal filter tank according to claim 1, characterized in that: A dust collecting box is arranged at the bottom of the tank body, the dust collecting box detachably closes the tank body, and the dust collecting box is used to carry impurities falling off from the second filter layer.

9. The dust removal filter tank according to claim 1, characterized in that: The partition carrier is rotatably disposed in the tank body, and a closing plate extending toward the upper chamber and the lower chamber respectively is disposed on the partition carrier, and the closing plate extends upward to the top of the tank body and downward to the bottom of the tank body, and the closing plate divides the tank body into a closed filtering area and a discharge area, and the closing plate divides the filter bags on the partition carrier into the filtering area and the discharge area; Wherein: the first air inlet and the first air outlet are arranged in the filtering area, the second air inlet and the second air outlet are arranged in the unloading area, the filtering area and the unloading area can work synchronously, and after rotating the partition carrier 180°, the filter bag can be switched between the filtering area and the unloading area.

10. The dust removal filter tank according to claim 9, characterized in that: The partition carrier plate and the closing plate are integrally formed, and sealing members are provided at the edges of the partition carrier plate and the closing plate that are in contact with the tank body.

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