Filtering equipment

Abstract

The utility model relates to filtering equipment. The filtering equipment comprises a filtering part and a cleaning part, the filtering part comprises a shell, an inner cavity of the shell forms a filtering cavity, at least two filtering layers which are arranged in a stacked mode are arranged in the filtering cavity, the shell is provided with an air inlet and an air outlet which are communicated with the filtering cavity, and a first valve is arranged on the side of the air inlet; the cleaning part comprises a medium inlet pipe and a waste outlet pipe which are respectively communicated with the filtering cavity, the medium inlet pipe is used for introducing a cleaning medium into the filtering cavity so as to clean each filtering layer, the waste outlet pipe is used for discharging the cleaning medium in the filtering cavity, and the medium inlet pipe and the waste outlet pipe are respectively provided with a switch valve. The filtering equipment is used for filtering dust in waste gas, can realize self-cleaning, does not need to frequently replace the filter element, saves time and labor, is low in cost and reduces maintenance.

Description

Technical Field

[0001] The present application relates to the technical field of exhaust gas filtering equipment, and in particular to a filtering equipment. Background Art

[0002] In the process of preparing solar cells, silicon wafers need to go through processes such as texturing, boron diffusion, etching, coating and printing in sequence. Among them, the boron diffusion process is a core process in the preparation of solar cells, that is, the silicon wafer is placed in a diffusion furnace with a quartz boat as a carrier, and nitrogen, oxygen and diffusion sources are introduced into the diffusion furnace at a certain temperature to diffuse and deposit a PN junction (the contact surface between p-type and n-type semiconductors is called a PN junction) on the surface of the silicon wafer.

[0003] The boron diffusion process will produce a large amount of waste gas carrying B2O3. B2O3 will crystallize to form white dust below a certain temperature. This part of the waste gas needs to be filtered and discharged to avoid pollution to the environment.

[0004] With the popularity of solar power generation, the demand for related photovoltaic products is increasing. Under the premise of increasing production capacity demand, the amount of waste gas treatment is increasing. If the waste gas generated by the boron diffusion process is filtered by the filtering equipment used for filtering waste gas in the existing technology, the filter element needs to be replaced frequently, which has high manpower and material costs and affects the production progress. Utility Model Content

[0005] The purpose of this application is to provide a filtering device for filtering dust in exhaust gas and achieving self-cleaning, without the need for frequent replacement of filter elements, thus saving time and effort, and reducing costs and maintenance.

[0006] In order to solve the above-mentioned technical problems, the present application provides a filtering device, including a filtering part and a cleaning part; the filtering part includes a shell, the inner cavity of the shell forms a filtering cavity, at least two stacked filtering layers are arranged in the filtering cavity, the shell is provided with an air inlet and an air outlet connected to the filtering cavity, and a first valve is provided on the air inlet side; the cleaning part includes a medium inlet pipe and a waste pipe respectively connected to the filtering cavity, the medium inlet pipe is used to introduce a cleaning medium into the filtering cavity to clean each of the filtering layers, the waste pipe is used to discharge the cleaning medium in the filtering cavity, and the medium inlet pipe and the waste pipe are respectively provided with a switch valve.

[0007] Compared with the solution of filtering the exhaust gas through multiple filter cartridges arranged in series, filtering the exhaust gas through multiple layers of filter layers arranged in parallel in sequence can obviously simplify the overall structure and volume of the filtering equipment, reduce the overall footprint, improve flexibility, and facilitate the cleaning operation of the cleaning part, thereby ensuring the long-term and stable operation of the filtering equipment.

[0008] Since the filter layers of the filter part are stacked in sequence, the specific number of filter layers and the filtration accuracy can be determined according to the actual dust content in the exhaust gas and the exhaust gas emission requirements. The material of the filter layer can be selected according to the use conditions, and the shape and structure of the filter layer can be set according to the structure of the filter cavity. There is no restriction on the installation method of the filter layer in the shell, such as plug-in connection, welding fixation, etc., which has good flexibility. The filter equipment can be applied to various scenarios with filtering needs.

[0009] The cleaning part includes a medium inlet pipe and a waste outlet pipe which are respectively connected to the filter cavity, wherein the cleaning part can introduce a cleaning medium into the filter cavity through the medium inlet pipe. After the cleaning medium is introduced into the filter cavity through the medium inlet pipe, it passes through each filter layer in turn and cleans each filter layer before being discharged from the waste outlet pipe. The medium inlet pipe and the waste outlet pipe are respectively provided with switch valves for opening and closing the medium inlet pipe and the waste outlet pipe. It is not difficult to understand that when it is necessary to clean the filter layers of the filter part with a cleaning medium, the switch valves of the medium inlet pipe and the waste outlet pipe are opened, and in the process of filtering the exhaust gas, the switch valves of the medium inlet pipe and the waste outlet pipe need to be closed.

[0010] The cleaning medium cleans the filter layer, which can be set through the program to automatically clean at any time, and the cleaning time can be set according to needs. It has good flexibility, and the filter layer can be reused without disassembly and replacement, reducing spare parts loss and maintenance costs.

[0011] Optionally, the shell is provided with a connecting pipe connected to the filter chamber, and the connecting pipe is provided with a first connecting end and a second connecting end at one end away from the shell, the first connecting end forms the air inlet and is provided with the first valve, and the second connecting end is sealed and connected to the medium inlet pipe.

[0012] Optionally, a trumpet-shaped structure is provided at one end of the shell facing the connecting pipe, and a small-diameter end of the trumpet-shaped structure is connected to the connecting pipe.

[0013] Optionally, a fan-shaped nozzle is provided at the end of the medium inlet pipe, the fan-shaped nozzle includes a narrowed end and an open end, and the diameter of the fan-shaped nozzle gradually increases from the narrowed end to the open end, and the open end is arranged toward one side of the filter cavity and opposite to the filter layer.

[0014] Optionally, a drying part is further included, and the drying part is communicated with the air outlet of the filtering part.

[0015] Optionally, it also includes a cover shell, in which a drying chamber and a circulation chamber are separated by a porous plate, a desiccant is arranged in the drying chamber and forms the drying part, the circulation chamber is connected between the filter chamber and the drying chamber, a waste outlet is arranged at the bottom of the circulation chamber, and the waste outlet is connected to the waste outlet pipe.

[0016] Optionally, the bottom wall of the circulation cavity is further provided with a guide surface along the circumference of the waste outlet.

[0017] Optionally, the drying chamber is arranged above the circulation chamber, the shell is arranged in the circulation chamber, and the bottom of the shell is an open structure and forms the air outlet.

[0018] Optionally, the cover shell includes a cylinder, a top cover and a bottom cover, the cylinder is provided with the porous plate, and the top cover and the top end of the cylinder, as well as the bottom cover and the bottom end of the cylinder are fixed by sealing flanges respectively.

[0019] Optionally, the inner wall surface of the shell and the surface of the filter layer are respectively provided with an anti-corrosion coating.

[0020] Optionally, the first valve is a one-way valve, and the flow direction of the one-way valve is from the air inlet channel to the filter part.

[0021] Optionally, a cooling device and a pump are further included, wherein the cooling device is connected to the air inlet through an air inlet channel, the air outlet is connected to an air outlet channel, and the pump is arranged in the air outlet channel.

[0022] Optionally, the air intake passage further includes a serpentine coil. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of the filter portion of the filter device provided in the embodiment of the present application in the filtering state;

[0024] Figure 2 yes Figure 1 A magnified view of middle;

[0025] Figure 3 yes Figure 1 The structural diagram of the middle filter part;

[0026] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle drying section and the cover;

[0027] Figure 5 It is a cross-sectional view of the filter part of the filter device in a cleaned state;

[0028] Figure 6 It is a structural diagram of the filtering equipment.

[0029] Attached Figure 1-Figure 6 In the figure, the reference numerals are described as follows:

[0030] 1 filtering part, 11 housing, 111 trumpet-shaped structure, 12 filtering chamber, 13 filtering layer, 14 first valve, 15 connecting pipe, 16 first connecting end, 17 second connecting end, 18 air outlet;

[0031] 21 medium inlet pipe, 211 fan-shaped nozzle, 22 waste outlet pipe, 23 switch valve;

[0032] 31 air inlet channel, 32 air outlet channel;

[0033] 4 drying section, 41 drying chamber, 42 desiccant;

[0034] 5 cover shell, 51 cylinder body, 52 top cover, 53 bottom cover, 54 flow chamber, 55 waste outlet, 56 porous plate, 57 guide surface;

[0035] 6. Cooling device;

[0036] 7 pumps;

[0037] 8 right angle connectors;

[0038] 9 serpentine coil;

[0039] 10 Bellows. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] The embodiment of the present application provides a filtering device for filtering exhaust gas to remove impurities such as dust in the exhaust gas to avoid direct discharge and pollution to the environment.

[0042] Taking the boron diffusion process in the preparation of solar cells as an example, since the boron diffusion process will produce a large amount of waste gas carrying B2O3, and B2O3 will crystallize to form white dust below a specific temperature, therefore, when the waste gas is discharged, it can be filtered by the filtering equipment provided in this embodiment to prevent B2O3 from being discharged into the atmosphere and causing pollution to the environment.

[0043] like Figure 1 As shown, the filtering device includes a filtering part 1 and a cleaning part, wherein the filtering part 1 is used to filter the exhaust gas to remove dust impurities mixed in the exhaust gas, and the cleaning part is used to clean the filtering part 1 to avoid clogging of the filtering part 1, thereby ensuring the normal use of the filtering device, improving the filtering efficiency and reducing the probability of maintenance.

[0044] Specifically, Figure 3As shown, the filter unit 1 includes a housing 11 and a filter layer 13. The inner cavity of the housing 11 forms a filter cavity 12. At least two filter layers 13 are arranged in the filter cavity 12. The filter layers 13 are stacked in sequence, and the filtration accuracy of each filter layer 13 is increased along the airflow direction (such as Figure 1 That is to say, the pore size of the filter holes of each filter layer 13 gradually decreases along the flow direction.

[0045] The shell 11 is provided with an air inlet and an air outlet 18, which are respectively connected to the filter chamber 12, and the air inlet is used to communicate with the air inlet channel 31, and the air outlet 18 is used to communicate with the air outlet channel 32. After the exhaust gas enters the filter chamber 12 through the air inlet channel 31 and the air inlet, it passes through each layer of the filter layer 13 in turn and is discharged from the air outlet 18 and the outlet channel. A first valve 14 is provided on the air inlet side.

[0046] Compared with the scheme of filtering the exhaust gas through multiple filter cartridges arranged in series, filtering the exhaust gas through multiple layers of filter layers 13 arranged in parallel in sequence can obviously simplify the overall structure and volume of the filtering device, reduce the overall footprint, improve flexibility, and facilitate the cleaning operation of the cleaning part, thereby ensuring the long-term stable operation of the filtering device.

[0047] Since the filter layers 13 of the filter unit 1 are stacked in sequence, the specific number of filter layers 13 and the filtering accuracy can be determined according to the actual dust content in the exhaust gas and the exhaust gas emission requirements, the material of the filter layer 13 can be selected according to the use conditions, and the shape and structure of the filter layer 13 can be set according to the structure of the filter cavity 12. There is no restriction on the installation method of the filter layer 13 in the housing 11, such as plug-in connection, welding fixation, etc., which has good flexibility. The filtering device can be applied to various scenes with filtering requirements.

[0048] If the cross-section of the filter cavity 12 is a circular structure, the filter layer 13 can be set to be circular or elliptical. When the filter layer 13 is arranged perpendicular to the flow direction of the filter cavity 12, the filter layer 13 is a circular structure. When the filter layer 13 and the flow direction of the filter cavity 12 are at a preset angle, the filter layer 13 can also be an elliptical structure. When the cross-section of the filter cavity 12 is a square structure, the cross-section of the filter layer 13 is also a square structure.

[0049] The cleaning part includes a medium inlet pipe 21 and a waste outlet pipe 22 which are respectively connected to the filter cavity 12. The cleaning part can pass the cleaning medium into the filter cavity 12 through the medium inlet pipe 21. The flow direction of the cleaning medium is as follows: Figure 5As shown by the middle arrow, after the cleaning medium is introduced into the filter cavity 12 through the medium inlet pipe 21, it passes through each filter layer 13 in turn and cleans each filter layer 13, and then is discharged from the waste outlet pipe 22. The medium inlet pipe 21 and the waste outlet pipe 22 are respectively provided with a switch valve 23 for opening and closing the medium inlet pipe 21 and the waste outlet pipe 22. It is not difficult to understand that when the cleaning medium is needed to clean the filter layers 13 of the filter part 1, the switch valve 23 of the medium inlet pipe 21 and the waste outlet pipe 22 is opened, and in the process of filtering the exhaust gas, the switch valve 23 of the medium inlet pipe 21 and the waste outlet pipe 22 needs to be closed.

[0050] The cleaning medium cleans the filter layer 13, which can be set by a program to automatically clean at any time, and the cleaning time can be set according to demand, which has good flexibility, and the filter layer 13 can be reused without disassembly and replacement, reducing component loss and maintenance costs.

[0051] The setting of the first valve 14 can prevent the cleaning medium from entering the air inlet passage 31 during cleaning. Specifically, the first valve 14 can be a solenoid valve, a pneumatic valve, etc. During the filtering process, the first valve 14 is opened, and during the cleaning process, the first valve 14 is closed, or the first valve 14 can also be set as a one-way valve. At this time, the opening direction of the first valve 14 is from the air inlet passage 31 to one side of the filter unit 1, and there is no need to open and close the first valve 14, which is easy to operate.

[0052] In this embodiment, the cleaning medium can be water or an aqueous solution mixed with a portion of a cleaning agent. The specific setting can be made according to the dust in the exhaust gas. For example, when the dust is mainly B2O3 and other substances that are easily absorbed by water, the cleaning medium can be water. When the cleaning medium passes through the filter layer 13, the dust on the surface of the filter layer 13 can be dissolved in the cleaning medium, and then discharged from the waste pipe 22 together with the cleaning medium.

[0053] like Figure 3 As shown, the shell 11 is also provided with a connecting pipe 15 connected to the filter chamber 12, one end of the connecting pipe 15 is connected to the filter chamber 12, and the other end is provided with two connecting ends, a first connecting end 16 and a second connecting end 17, wherein the first connecting end 16 forms the above-mentioned air inlet and is provided with a first valve 14, the first connecting end 16 is connected to the air inlet channel 31, the second connecting end 17 is used to communicate with the medium inlet pipe 21, and the second connecting end 17 and the medium inlet pipe 21 are circumferentially sealed to prevent exhaust gas leakage or cleaning medium leakage between the second connecting end 17 and the medium inlet pipe 21.

[0054] The air inlet channel 31 introduces exhaust gas into the filter chamber 12 through the first connection end 16, and the medium introduction pipe 21 introduces cleaning medium into the filter chamber 12 through the second connection end 17. Of course, in this embodiment, the housing 11 may be provided with two connection pipes 15, one of which is connected to the air inlet channel 31, and the other is connected to the medium introduction pipe 21. When the two connection ends of one connection pipe 15 are respectively connected to the air inlet channel 31 and the medium introduction pipe 21, the overall structure can be simplified and made more regular.

[0055] And, if Figure 3 As shown, in this embodiment, a trumpet-shaped structure 111 is provided at one end of the shell 11 facing the connecting pipe 15, and the trumpet-shaped structure 11 includes a large diameter end and a small diameter end, wherein the small diameter end is connected to the connecting pipe 15, and the filter layer 13 is arranged opposite to the large diameter end (preferably, the filter layer 13 is arranged along the cross-section of the large diameter end, that is, the axis of the large diameter end is arranged perpendicular to the filter layer 13). After the exhaust gas and the cleaning medium enter the filter cavity 12 along the connecting pipe 15, the flow rate of the exhaust gas and the cleaning medium decreases after diffusion due to the increase in diameter, and then they are evenly sprayed onto the surface of the filter layer 13 along the cross-section of the filter cavity 12. Finally, the gas is discharged from the gas outlet 18, and the cleaning medium is discharged from the waste outlet pipe 22, thereby improving the filtering effect and the cleaning effect.

[0056] like Figure 2 As shown, a fan-shaped nozzle 211 is provided at the end of the medium inlet pipe 21. The fan-shaped nozzle 211 is provided with a constricted end and an open end. The diameter of the fan-shaped nozzle 211 gradually increases from the constricted end to the open end. The open end is arranged toward one side of the filter cavity 12 and is opposite to the filter layer 13. The liquid in the medium inlet pipe 21 flows along the medium inlet pipe 21 to the fan-shaped nozzle 211, and when it is sprayed out by the fan-shaped nozzle 211, it can be guided by the inner wall of the fan-shaped nozzle 211 to diffuse into the filter cavity 12 and evenly sprayed onto the surface of the filter layer 13, so as to realize uniform contact between the cleaning medium and the dust particles on the surface of the filter layer 13. After the dust particles are dissolved in the cleaning medium, they will fall to the next layer of the filter layer 13 along with the cleaning medium until they are finally discharged from the waste outlet pipe 22.

[0057] The arrangement of the fan-shaped nozzle 211 can expand the contact area between the cleaning medium and the filter layer 13 after the cleaning medium is sprayed into the filter cavity 12, thereby cleaning every corner to the greatest extent and ensuring the cleaning effect.

[0058] In this embodiment, the cleaning medium is water, and the filtering device also includes a drying part 4. After the filter part 1 is cleaned with water, there will inevitably be residual water in the filter layer 13, and the gas filtered by the filter layer 13 will inevitably be mixed with water vapor. The drying part 4 is connected to the air outlet 18 of the filter part 1, specifically connected between the filter part 1 and the air outlet channel 32. The drying part 4 is used to dry the gas to remove moisture mixed in the gas and avoid pollution when the gas is discharged into the atmosphere.

[0059] like Figure 1 and Figure 5 As shown, the filtering device also includes a cover shell 5, in which a porous plate 56 is provided. The porous plate 56 divides the inner cavity of the cover shell 5 into a drying chamber 41 and a flow chamber 54, wherein the flow chamber 54 is connected between the filter chamber 12 and the drying chamber 41, and a desiccant 42 is provided in the drying chamber 41 to constitute the above-mentioned drying part 4, and a waste outlet 55 is provided at the bottom of the flow chamber 54, and the waste outlet 55 is connected to the waste outlet pipe 22, that is, the flow chamber 54 is also connected between the filter chamber 12 and the waste outlet pipe 22.

[0060] The filtered gas in the filter chamber 12 will pass into the circulation chamber 54 through the air outlet 18, then enter the drying chamber 41 for drying, and finally be discharged from the air outlet channel 32. After the cleaning medium for cleaning the filter layer 13 in the filter chamber 12 enters the circulation chamber 54, it will fall to the bottom of the circulation chamber 54 under the action of gravity, and enter the waste outlet pipe 22 through the waste outlet 55 for discharge.

[0061] The gas and cleaning medium in the filter chamber 12 are discharged into the circulation chamber 54, and the gas and cleaning medium in the circulation chamber 54 enter the drying chamber 41 and the waste pipe 22 respectively. The gas outlet of the circulation chamber 54 (i.e., the hole structure of the porous plate 56) is arranged on the side wall or the top wall thereof, and the waste outlet 55 of the circulation chamber 54 is arranged on the bottom wall. In this arrangement, the cleaning medium can be discharged under the action of gravity, and the cleaning medium can be prevented from entering the gas outlet channel 32.

[0062] Specifically, Figure 1-Figure 5 As shown, the drying chamber 41 is arranged above the circulation chamber 54, and the gas outlet of the circulation chamber 54 is arranged at the top of the circulation chamber 54. The gas entering the circulation chamber 54 will flow upward and pass through the drying chamber 41 for drying. The shell 11 is located in the circulation chamber 54, and the bottom of the shell 11 is an open structure and forms the above-mentioned gas outlet 18. The cleaning medium in the filter chamber 12 will fall into the circulation chamber 54 under the action of gravity, and fall to the waste outlet 55.

[0063] Of course, the drying chamber 41 can also be arranged on the side of the circulation chamber 54, and the filter chamber 12 can be arranged above the circulation chamber 54. In the process of filtering the exhaust gas, since the exhaust pipe 22 is closed by the switch valve 23, the gas filtered by the filter layer 13 can be discharged from the gas outlet 18 and enter the circulation chamber 54. At this time, the circulation chamber 54 has only one outlet connected to the drying chamber 41, so the filtered gas will enter the drying chamber 41. When the filter layer 13 is cleaned, the cleaning medium will fall into the circulation chamber 54 and then fall to the exhaust outlet 55.

[0064] When the housing 11 is disposed in the circulation chamber 54, the arrangement of the housing 5 and the housing 11 can be simplified, the overall volume can be reduced, and the overall space requirement can be reduced. In addition, the drying chamber 41 is disposed above the circulation chamber 54, which can prevent the cleaning medium from entering the drying chamber 41 and affecting the drying effect of the desiccant 42.

[0065] The bottom wall of the circulation cavity 54 is also provided with a guide surface 57 along the circumference of the waste outlet 55, and the guide surface 57 can provide guidance for the cleaning medium falling into the bottom of the circulation cavity 54, so that the cleaning medium flows along the guide surface 57 to the waste outlet 55, and is finally discharged from the waste outlet pipe 22. Specifically, the guide surface 57 can be a conical surface or an inclined surface, which is not specifically limited here.

[0066] like Figure 4 As shown, the cover shell 5 includes a cylinder 51, a top cover 52 and a bottom cover 53, wherein the top cover 52 covers the top end of the cylinder 51, and the bottom cover 53 covers the bottom end of the cylinder 51, and the top cover 52 and the cylinder 51, as well as the bottom cover 53 and the cylinder 51 are fixed by sealing flanges respectively. Such an arrangement can simplify the installation operation and ensure the sealing.

[0067] A porous plate 56 is provided in the cylinder 51 and divides the space in the cylinder 51 into a drying chamber 41 and a circulation chamber 54. The drying chamber 41 is formed above the porous plate 56 and a desiccant 42 is placed therein. The circulation chamber 54 is provided below the porous plate 56. The upper surface of the bottom cover 53 is provided with the above-mentioned guide surface 57.

[0068] In this embodiment, the surfaces of the various components of the filter device are also provided with anti-corrosion coatings, such as the inner wall surface of the housing 11, the inner wall surface of the cover 5, the inner wall surface of the connecting pipe 15, the surface of the filter layer 13, etc. are all provided with anti-corrosion coatings. Such a configuration can be applied to the filtration of corrosive gases such as acidic waste gas or alkaline waste gas, thereby increasing the scope of application and extending the service life of the filter device. Specifically, the walls and surfaces of the various components can be coated with Teflon (mainly), aluminum oxide, silicon carbide, etc., and no specific restrictions are made here. Of course, the various components of the filter unit 1 and the cleaning unit can also be directly made of anti-corrosion materials.

[0069] The filtering device also includes a cooling device 6 and a pump 7, etc. Figure 6 As shown, the cooling device 6 is connected to the air inlet through the air inlet channel 31. The outlet end of the cooling device 6 is provided with a right-angle joint 8, and the right-angle joint 8 is connected to the air inlet channel 31. The air inlet channel 31 includes a serpentine coil 9, and the serpentine coil 9 is connected to the air inlet through the bellows 10 to achieve a flexible connection. The first valve 14 can be arranged at the air inlet or at the bellows 10, and the pump 7 is connected to the air outlet channel 32.

[0070] In detail, before the exhaust gas passes through the air inlet 31 into the air inlet, it is first cooled by the cooling device 6 to reduce the temperature of the exhaust gas, thereby reducing the requirements for the various components of the filtering device, thereby reducing the cost. Of course, in this embodiment, the housing 11, the cover 5, the filter layer 13, etc. can also be made of high-temperature resistant materials to improve the heat resistance and overall life of the filtering device. In this embodiment, the cooling device 6 can cool the exhaust gas by air cooling, water cooling or oil cooling, etc., and no specific restrictions are made here.

[0071] The pump 7 is connected to the gas outlet channel 32 to provide circulation power for the filtered gas to ensure the filtering efficiency.

[0072] The serpentine coil 9 is located between the cooling device 6 and the filter section 1. When the exhaust gas passes through the serpentine coil 9, it can also exchange heat with the external air for further cooling. Therefore, the serpentine coil 9 can extend the path of the exhaust gas before entering the filter section 1, further improving the cooling effect. Moreover, when the exhaust gas passes through the serpentine coil 9, the dust in the exhaust gas can be adsorbed on the inner wall of the serpentine coil 9, so as to further improve the filtering effect.

[0073] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A filtering device, characterized in that: It comprises a filtering part (1) and a cleaning part; The filter unit (1) comprises a housing (11), the inner cavity of the housing (11) forming a filter cavity (12), at least two stacked filter layers (13) being arranged in the filter cavity (12), the housing (11) being provided with an air inlet and an air outlet (18) communicating with the filter cavity (12), and a first valve (14) being provided on the air inlet side; The cleaning section comprises a medium inlet pipe (21) and a waste outlet pipe (22) respectively connected to the filter cavity (12); the medium inlet pipe (21) is used to introduce a cleaning medium into the filter cavity (12) to clean each filter layer (13); the waste outlet pipe (22) is used to discharge the cleaning medium in the filter cavity (12); and the medium inlet pipe (21) and the waste outlet pipe (22) are respectively provided with a switch valve (23).

2. The filtering device according to claim 1, characterized in that The housing (11) is provided with a connecting pipe (15) communicating with the filter chamber (12); an end of the connecting pipe (15) away from the housing (11) is provided with a first connecting end (16) and a second connecting end (17); the first connecting end (16) forms the air inlet and is provided with the first valve (14); the second connecting end (17) is sealedly connected to the medium inlet pipe (21).

3. The filtering device according to claim 2, characterized in that A trumpet-shaped structure (111) is provided at one end of the shell (11) facing the connecting pipe (15), and the small-diameter end of the trumpet-shaped structure (111) is connected to the connecting pipe (15).

4. The filtering device according to claim 2, characterized in that: A fan-shaped nozzle (211) is provided at the end of the medium inlet pipe (21), the fan-shaped nozzle (211) comprises a constricted end and an open end, and the diameter of the fan-shaped nozzle (211) gradually increases from the constricted end to the open end, and the open end is arranged toward one side of the filter cavity (12) and is opposite to the filter layer (13).

5. The filtering device according to any one of claims 1 to 4, characterized in that: It also comprises a drying section (4), wherein the drying section (4) is in communication with the air outlet (18) of the filtering section (1).

6. The filtering device according to claim 5, characterized in that The invention also comprises a housing (5), wherein a drying chamber (41) and a circulation chamber (54) are formed by dividing the housing (5) by a porous plate (56), wherein a desiccant (42) is arranged in the drying chamber (41) and forms the drying part (4), wherein the circulation chamber (54) is connected between the filter chamber (12) and the drying chamber (41), and a waste outlet (55) is arranged at the bottom of the circulation chamber (54), and the waste outlet (55) is connected to the waste outlet pipe (22).

7. The filtering device according to claim 6, characterized in that The bottom wall of the circulation chamber (54) is also provided with a guide surface (57) along the circumference of the waste outlet (55).

8. The filtering device according to claim 6, characterized in that The drying chamber (41) is arranged above the circulation chamber (54), the shell (11) is arranged in the circulation chamber (54), and the bottom of the shell (11) is an open structure and forms the air outlet (18).

9. The filtering device according to claim 6, characterized in that The cover shell (5) comprises a cylinder (51), a top cover (52) and a bottom cover (53); the porous plate (56) is arranged inside the cylinder (51); the top cover (52) and the top end of the cylinder (51), as well as the bottom cover (53) and the bottom end of the cylinder (51), are fixed respectively by sealing flanges.

10. The filtering device according to any one of claims 1 to 4, characterized in that: The inner wall surface of the shell (11) and the surface of the filter layer (13) are respectively provided with anti-corrosion coatings.

11. The filtering device according to any one of claims 1 to 4, characterized in that: The first valve (14) is a one-way valve, and the flow direction of the one-way valve is from the air inlet channel (31) to the filter part (1).

12. The filtering device according to any one of claims 1 to 4, characterized in that: It also includes a cooling device (6) and a pump (7); the cooling device (6) is connected to the air inlet via an air inlet channel (31); the air outlet (18) is connected to an air outlet channel (32); and the pump (7) is connected to the air outlet channel (32).

13. The filtering device according to claim 12, characterized in that The air inlet passage (31) further comprises a serpentine coil (9).

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