A long-lasting dust filter for a desert environment and its design and maintenance method

Abstract

The present invention discloses a long-term dust filter for a sandy desert environment and a design and maintenance method thereof. The filter comprises a housing and a first filter module, a second filter module and a third filter module arranged in the housing. External air enters the housing through an air inlet on the housing and is filtered. A first dust sensor and a first pressure sensor are arranged on the front side of the first filter module, a second dust sensor and a second pressure sensor are arranged between the rear side of the first filter module and the front side of the second filter module, a third dust sensor and a third pressure sensor are arranged between the rear side of the second filter module and the front side of the third filter module, and a fourth dust sensor and a fourth pressure sensor are arranged on the rear side of the third filter module. The present invention can effectively control the service environment of electrical products in a sandy desert environment and can effectively reduce the manufacturing cost and operation and maintenance cost of electronic and electrical products in a sandy and dusty environment.

Description

Technical Field

[0001] The invention relates to the technical field of dust filtering, and in particular to a long-lasting dust filter for a sand-go environment and a design and maintenance method thereof. Background Art

[0002] Shagohuang refers to deserts, Gobi and wasteland. These areas have vast landforms and rich resources such as wind energy and solar energy, becoming the "new battlefield" for the current development of new energy. Unlike other environments, the vegetation and water sources here are scarce, and the sand and wind energy are abundant, which makes the area very prone to sandstorms. Especially under the action of strong winds, dust has a great wear and impact effect. New energy products such as wind power generation and photovoltaic power generation are often operated in these occasions. The equipment is often worn by wind and sand, and the debris may connect the insulation interface. The dust is stuck in the bearing system, causing overheating and explosion. Therefore, it is particularly important to protect the core components. The commonly used method is dust filtration. However, due to the wide distribution of dust particle sizes, coarse filters are difficult to filter fine sand and are highly destructive. Fine sand is easily saturated by wind pressure, and the replacement cycle is greatly shortened. In addition, Shagohuang is remote and desolate, and it is difficult to manually inspect and replace it. If it is not replaced in time, the filtering effect cannot be achieved, and other accidents may also occur. In general, the existing dust filters have poor filtering effects and the filter module is replaced frequently. In addition, the filters also have problems such as difficult maintenance. Summary of the invention

[0003] One of the purposes of the present invention is to provide a long-lasting dust filter for a sandy and deserted environment, which can effectively control the service environment of electrical products in a sandy and deserted environment and effectively reduce the manufacturing cost and operation and maintenance cost of electronic and electrical products in a sandy and deserted environment.

[0004] A Shagohuang environmental long-lasting dust filter comprises a shell and a first filter module, a second filter module and a third filter module arranged in the shell. After external air enters the shell through an air inlet on the shell, it is filtered by the first filter module, the second filter module and the third filter module in sequence. A first dust sensor and a first pressure sensor are arranged on the front side of the first filter module, a second dust sensor and a second pressure sensor are arranged between the rear side of the first filter module and the front side of the second filter module, a third dust sensor and a third pressure sensor are arranged between the rear side of the second filter module and the front side of the third filter module, and a fourth dust sensor and a fourth pressure sensor are arranged on the rear side of the third filter module.

[0005] The first filter module includes an outer frame and a multi-layer metal mesh installed on the outer frame, the multi-layer metal mesh is composed of a plurality of single-layer metal meshes stacked and movable manually or automatically, and the filtering effect of the first filter module is changed by manually or automatically adjusting the number of stacked metal mesh layers, the front side surface of the outer frame is the air inlet side of the first filter module, the front side surface of the outer frame is arranged to be a multi-mesh structure, the rear side surface of the outer frame is the air outlet side of the first filter module, the rear side surface of the outer frame is arranged to be a non-porous surface, and the first filter module air outlet is opened at the upper part of the rear side surface of the outer frame, and a dust box is arranged below the first filter module.

[0006] The second filter module is provided with a wet filter area, a buffer area and a rotary wheel moisture absorption area from front to back. The dust-containing air passes through the wet filter area and enters the buffer area, and then enters the rotary wheel moisture absorption area, and delivers dry air to the third filter module.

[0007] The third filter module includes a coarse fiber layer, a dry layer and a fine fiber layer. The coarse fiber layer filters residual dust, the dry layer absorbs water vapor, and the fine fiber layer performs re-filtration.

[0008] The air outlet of the first filter module of the present invention is at the upper part of the rear side. During the operation of the filter, air containing dust and gravel enters the first filter module from the front side. Due to the action of gravity and the movement resistance generated by the horizontal collision non-hole area, large particles of gravel fall into the dust collection box. The dusty air enters the second filter module, is first filtered in the wet filter area and then dehumidified by the rotor. There is a buffer zone between the wet filter area and the rotor moisture absorption area to prevent the rotor dehumidification from affecting the wet filtration.

[0009] The present invention can remove dust from the air through sedimentation filtration of the first filter module, wet filtration of the second filter module and blocking filtration of the third filter module, thereby reducing the loss of indoor equipment caused by dust. At the same time, the dual dehumidification method of rotary dehumidification and drying layer can effectively reduce the probability of condensation of service equipment.

[0010] The dust sensors and pressure sensors of the present invention are used to monitor the dust concentration and pressure values ​​on the front and rear sides of the first filter module, the second filter module and the third filter module. A filter cleaning and maintenance strategy can be designed based on the dust concentration changes and pressure differences before and after filtration of each filter module.

[0011] The present invention also has the following preferred design:

[0012] The dust box of the present invention is provided with a smoothing mechanism, which includes a T-shaped structure consisting of a rotating shaft and a smoothing arm. The smoothing arm is provided with a plurality of downward comb teeth, and the rotating shaft can be driven to rotate regularly by external force to spread the dust in the dust box as much as possible.

[0013] The dust box of the present invention is provided with a height sensor for monitoring the height of dust accumulated in the dust box, and providing feedback to prompt dumping of the dust box when the height of dust accumulated in the dust box reaches a warning height.

[0014] The metal mesh of the present invention is composed of a plurality of criss-crossed adjustable metal strips, each of which is equipped with a distance sensor and a power source for adjusting the position of the metal strip. The mesh size of the metal mesh can be automatically adjusted according to the change in dust concentration and the pressure difference before and after filtration by the first filtration module.

[0015] The first filter module of the present invention is connected to the dust collecting box through a spiral channel at the bottom, which serves to buffer the impact force of falling sand and dust, avoid splashing fine sand and dust, and avoid the possibility of sand and dust backflowing into the filter.

[0016] The wet filtration area of ​​the second filtration module of the present invention is made of wet kraft paper, and the internal structure is a diagonal honeycomb structure that is inclined downward. A spray box is arranged above the wet filtration area, and a water storage tank is arranged below the wet filtration area. The water storage tank is connected to the spray box through a water supply pipe with a pump. The water source is provided by the water storage tank, and wet filtration can be performed by regular spraying.

[0017] The water storage tank of the present invention is provided with a filter medium for separating dust and water. When the sand and water washed from the wet filter area enter the water storage tank, the water filtered by the filter medium is recirculated and pumped into the spray box above. Preferably, the water storage tank is separated into a sand and water area by the filter medium, and the sand and water area is used to collect dust washed or flowed from the wet filter area. The water in the sand and water area is separated from dust and water by the filter medium. The water storage tank is connected to the spray box through a water supply pipe with a pump, and the filtered water is circulated by the pump to act on the wet filter area.

[0018] The second object of the present invention is to provide a design and maintenance method for the above-mentioned Shagohuang environmental long-lasting filter, by monitoring the dust concentration before and after filtration by the first filter module, the second filter module and the third filter module through the first dust sensor, the second dust sensor, the third dust sensor and the fourth dust sensor, and adjusting the number of stacked metal mesh layers and / or the mesh size of the metal mesh so that the dust concentration after filtration by the first filter module is less than 10-40% of the dust concentration before filtration, and when the dust concentration after filtration by the third filter module is greater than 10% of the dust concentration before filtration by the first filter module, the filter is cleaned and maintained or the filter module is replaced; the pressure difference before and after filtration by the first filter module, the second filter module and the third filter module is monitored by the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor, and when the pressure difference is greater than the threshold set by the control system of the filter, the filter is cleaned and maintained or the filter module is replaced.

[0019] The present invention can simulate the filter according to the dust particle size distribution and concentration level of the filter use environment, set the dust particle size simulation boundary, and determine the number of metal mesh layers or metal mesh size required to be stacked for the first filter module through simulation.

[0020] The dust particle size simulation boundary formula is as follows:

[0021] When the Reynolds number Re related to the drag coefficient is less than 1,

[0022] ;

[0023] When the Reynolds number related to the drag coefficient is greater than 10 3 :

[0024] ;

[0025] In the formula, d is the dust particle size, η is the viscosity coefficient, g is the gravitational acceleration, ρ air is the air density, ρ sand is the dust density.

[0026] The simulation can be performed using any simulation software, such as COMSOL, ANSYS, ABAQUS, etc.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The present invention solves the problem of poor filtration efficiency of existing dust filters by combining sedimentation filtration, wet filtration and blocking filtration. It can effectively control the service environment of electrical products in sandy and desert environments and effectively reduce the manufacturing cost and operation and maintenance cost of electronic and electrical products in sandy and desert environments.

[0029] 2. The present invention utilizes sedimentation filtration and wet filtration to achieve long-term and recyclable use of the filter, thereby reducing the frequency of filter replacement.

[0030] 3. The present invention can achieve the effects of early warning and guiding operation and maintenance through intelligent control systems and sensor feedback responses. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A structural principle diagram of a long-lasting dust filter for a Shagohuang environment provided by the present invention;

[0032] Figure 2 is a distribution diagram of simulated dust concentration obtained by using the first dust sensor in the embodiment;

[0033] Figure 3 is a distribution diagram of simulated dust concentration obtained by using the second dust sensor in the embodiment;

[0034] Figure 4 FIG. 4 is a distribution diagram of simulated dust concentration obtained by using the fourth dust sensor in the embodiment.

[0035] Description of reference numerals:

[0036] 1-air inlet; 2-first filter module; 3-first dust sensor; 4-first pressure sensor; 5-sealing strip; 6-air outlet of first filter module; 7-second dust sensor; 8-second pressure sensor; 9-wet filter area; 10-spray box; 11-buffer zone; 12-rotor moisture absorption zone; 13-rotor dehumidification fan; 14-third dust sensor; 15-third pressure sensor; 16-third filter module; 17-fourth dust sensor; 18-fourth pressure sensor; 19-control system; 20-filter fan; 21-housing; 22-water tank; 23-pump; 24-first filter screen; 25-second filter screen; 26-sand and water area of ​​water tank; 27-first height sensor; 28-smoothing arm; 29-dust box; 30-spiral channel; 31-rotating shaft; 32-comb teeth; 33-second height sensor. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical scheme and advantages of the present invention more obvious, the exemplary embodiments according to the present invention will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein. Based on the embodiments of the present invention described in the present invention, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present invention.

[0038] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0039] It should be understood that the present invention can be implemented in different forms and should not be interpreted as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to make the disclosure thorough and complete and to fully convey the scope of the present invention to those skilled in the art.

[0040] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0041] In order to fully understand the present invention, a detailed structure will be proposed in the following description to illustrate the technical solution proposed by the present invention. The optional embodiments of the present invention are described in detail as follows, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0042] A long-lasting dust filter for a Shagohuang environment comprises a shell 21 and a first filter module 2, a second filter module and a third filter module 16 arranged in the shell 21. A sealing strip 5 can be arranged at the connection between the shell 21 and each filter module so that external air enters the shell 21 through an air inlet 1 on the shell 21 and is filtered in sequence through the first filter module 2, the second filter module and the third filter module 16. A first dust sensor 3 and a first pressure sensor 4 are arranged on the front side of the first filter module 2, a second dust sensor 7 and a second pressure sensor 8 are arranged between the rear side of the first filter module 2 and the front side of the second filter module, a third dust sensor 14 and a third pressure sensor 15 are arranged between the rear side of the second filter module and the front side of the third filter module 16, and a fourth dust sensor 17 and a fourth pressure sensor 18 are arranged on the rear side of the third filter module 16.

[0043] Among them, the first filter module 2 includes an outer frame and a multi-layer metal mesh installed on the outer frame, the multi-layer metal mesh is composed of a plurality of single-layer metal meshes stacked and movable manually or automatically, and the filtering effect of the first filter module 2 is changed by manually or automatically adjusting the number of stacked metal mesh layers. Its automatic implementation method can adopt a linear drive mechanism in the prior art to control each layer of metal mesh to be pulled out or installed into the first filter module 2 in a translational form. The front side surface of the outer frame is the air inlet side of the first filter module 2, and the front side surface of the outer frame is arranged to be a multi-mesh structure to allow external air to enter, and the rear side surface of the outer frame is the air outlet side of the first filter module 2, and the rear side surface of the outer frame is arranged to be a non-porous surface, and a first filter module air outlet 6 is opened at the upper part of the rear side surface of the outer frame, and a dust box 29 is arranged below the first filter module 2.

[0044] The second filter module is provided with a wet filter area 9, a buffer area 11 and a rotary moisture absorption area 12 from front to back. The dust-containing air passes through the wet filter area 9 and enters the buffer area 11, and then enters the rotary moisture absorption area 12, and delivers dry air to the third filter module 16.

[0045] The third filter module 16 includes a coarse fiber layer, a dry layer and a fine fiber layer. The coarse fiber layer filters residual dust, the dry layer absorbs water vapor, and the fine fiber layer performs re-filtration.

[0046] In this embodiment, the rotary dehumidification zone 12 is powered by a rotary dehumidification fan, and a rotary dehumidification fan in the prior art can be selected according to the needs. A filter fan 20 is arranged at the rear side of the third filter module 16 to provide power for the filter.

[0047] A smoothing mechanism is provided in the dust box 29, and the smoothing mechanism includes a T-shaped structure consisting of a rotating shaft 31 and a smoothing arm 28. The smoothing arm 28 is provided with a plurality of downward comb teeth 32. The rotating shaft 31 can be driven by external force to rotate regularly so that the dust in the dust box 29 can be spread as much as possible.

[0048] The dust box 29 is provided with height sensors, namely a first height sensor 27 and a second height sensor 33, for monitoring the height of dust accumulated in the dust box 29, and providing feedback to prompt dumping of the dust box 29 when the height reaches the warning height.

[0049] In this embodiment, the metal mesh can be composed of a number of adjustable metal strips that are criss-crossed. Each metal strip is equipped with a distance sensor and a power source for adjusting the position of the metal strip. The mesh size of the metal mesh can be automatically adjusted according to the change in dust concentration and the pressure difference before and after filtration by the first filter module 2 to adjust the filtering interception capacity of the first filter module 2.

[0050] The first filter module 2 is connected to the dust box 29 through a spiral channel 30 at its lower side, thereby reducing the possibility of dust in the dust box 29 returning upward.

[0051] The main body of the wet filter area 9 of the second filter module is made of wet kraft paper. Its working principle and structure can be found in the long-term chemical filtration module recorded in the Chinese patent application number CN2020103243960. In this embodiment, the internal structure of the wet filter area 9 is a diagonal honeycomb structure that is inclined downward. A spray box 10 is arranged above the wet filter area 9, and a water tank 22 is arranged below the wet filter area 9. The water tank 22 is connected to the spray box 10 through a water supply pipe with a pump 23. The water source is provided by the water tank 22, and wet filtration can be performed by regular spraying. Among them, a filter medium is arranged in the water tank 22 for separating dust and water. Specifically, the filter medium in the water tank 22 adopts a vertical first filter screen 24 and a second filter screen 25. The water tank 22 is separated into a water tank sand and water area 26 for depositing dust by left and right infiltration filtration. When the sand and water washed from the wet filter area 9 enters the water storage tank 22, the water filtered by the filter medium is recirculated and pumped into the spray box 10 above.

[0052] The design and maintenance method of the above-mentioned Shagohuang environmental long-term filter is as follows: the dust concentration before and after filtering by the first filter module 2, the second filter module and the third filter module 16 is monitored by the first dust sensor 3, the second dust sensor 7, the third dust sensor 14 and the fourth dust sensor 17, and the dust concentration after filtering by the first filter module 2 is adjusted by adjusting the number of stacked metal mesh layers and / or the mesh size of the metal mesh to be less than 10% to 40% of the dust concentration before filtering. In actual applications, when the dust is mainly medium sand and coarse sand, the dust concentration after filtering by the first filter module 2 is less than 10% before filtering; when the dust is mainly fine sand and very fine sand, the dust concentration after filtering by the first filter module 2 is less than 20% before filtering; when the dust is mainly sticky sand and powdery sand, the dust concentration after filtering by the first filter module 2 is less than 20% before filtering. The dust concentration after filtering by the first filter module 2 is less than 40% before filtering, which can ensure that the filter has good performance, and when the dust concentration after filtering by the third filter module 16 is greater than 10% of the dust concentration before filtering by the first filter module 2, the filter is cleaned and maintained or the filter module is replaced; the pressure difference before and after filtration by the first filter module 2, the second filter module and the third filter module 16 is monitored by the first pressure sensor 4, the second pressure sensor 8, the third pressure sensor 15 and the fourth pressure sensor 18. When the pressure difference is greater than the threshold set by the control system of the filter, the filter is cleaned and maintained or the filter module is replaced. Generally, when the pressure difference after use of the filter is 1.5 times that before use, the filter is cleaned and maintained or the filter module is replaced.

[0053] In order to reduce the maintenance frequency of the filter, the filter can be simulated according to the dust particle size distribution and concentration level of the filter usage environment, the dust particle size simulation boundary can be set, and the number of metal mesh layers or metal mesh size required to be stacked for the first filter module can be determined through simulation.

[0054] The Udden-Wentworth particle size classification standard is used for dust particle size classification, that is, particle size d<5.5μm is clay, 5.5μm<d≤63μm is silt, 63μm<d≤125μm is very fine sand, 125μm<d≤250μm is fine sand, 250μm<d≤500μm is medium sand, and particle size d>500μm is coarse sand.

[0055] The simulation can be performed using COMSOL, ANSYS, ABAQUS, etc. The present embodiment uses COMSOL for simulation to create a simulation model of an adjustable first filter module, so that the aperture of the outer frame of the first filter module close to the air inlet side is 5mm, and the side away from the air inlet is a non-porous stainless steel plate surface. The inside of the outer frame is five stainless steel meshes with adjustable apertures. The initial grid aperture is 5mm, and sand and dust are created, and the particle size is consistent with the dust sensor.

[0056] The dust particle size simulation boundary formula is as follows:

[0057] When the Reynolds number Re related to the drag coefficient is less than 1,

[0058] ;

[0059] When the Reynolds number related to the drag coefficient is greater than 10 3 :

[0060] ;

[0061] In the formula, d is the dust particle size, η is the viscosity coefficient, g is the gravitational acceleration, ρ air is the air density, ρ sand is the dust density.

[0062] In this embodiment, the first dust sensor 3 is used to obtain the dust particle size distribution and concentration level, and the dust particle size distribution and concentration level are fed back to the simulation system. The simulation system simulates the dust state in the same environment according to the obtained dust information. The simulation system obtains the boundary particle size according to the boundary conditions, sets the boundary mesh size in the simulation system, and evaluates the dust filtration level. When the dust concentration after the filter is less than 20% of the dust concentration before the filter, it means that the mesh size selected by the filtration system is appropriate. For example, in the initial state, the number of metal mesh layers of the first filter module is 1 layer. When the dust concentration after the filter is greater than 20% of the dust concentration before the filter, and the dust passing through is finer, the mesh size of the metal mesh is automatically adjusted to 50% of the previous one, and so on, until the dust concentration after filtration is less than 20% before filtration. The number of layers and mesh size of the metal mesh can also be adjusted simultaneously by a progressive method until the dust concentration after filtration is less than 20% before filtration. At this time, the number of metal mesh layers and the mesh size data of the metal mesh are fed back to the control system 19 of the filter, and the control system 19 adjusts the number of layers and mesh size of the corresponding metal mesh according to the simulation results.

[0063] The first filtering module control process: the dust sensor data is fed back to the simulation system, which simulates the same dust distribution level and simulates the dust passing through metal mesh filters with different numbers of layers and mesh sizes in turn until a good filtering effect is achieved. The simulation system then feeds back the pore size distribution and number of layers with good filtering effect to the control system, thereby adjusting the number of metal mesh layers and pore size.

[0064] This embodiment simulates a dust environment in the laboratory, a mixed environment of sand and gravel in different proportions, where the dust in the atmosphere is mainly suspended sand with a particle size of less than 100um. Research literature shows that it is mainly fine sand and very fine sand, accounting for about 80% to 90%. Therefore, the simulated dust is mainly fine sand and very fine sand. The dust distribution obtained by the first dust sensor 3 is as follows: Figure 2 As shown in the figure, the feedback found that the dust particle size in the simulated environment is large, and the Reynolds number Re>10 3 The corresponding dust particle size simulation boundary formula, the corresponding minimum particle size of large dust particles d min=390um, the mesh size of the metal mesh can be between 0 and 390um. Therefore, the simulation system initially sets the metal mesh size to 390um. After filtering, the dust concentration data obtained by the second dust sensor 7 on the rear side of the first filter module 2 is greater than 20% of the dust concentration monitored by the first dust sensor. The simulation system is adjusted to a mesh size of 190um. After filtering, the dust concentration monitored by the second dust sensor 7 on the rear side is greater than 20% of the dust concentration monitored by the first dust sensor 3 on the front side, but the particle size greater than 100um is less than 20% before filtering. Further simulation adjustment of the first filter module, setting two layers of metal mesh, making the mesh size of the first layer 190um, the mesh size of the second layer 95um, the dust concentration data obtained by the second dust sensor 7 is still greater than 20% of the dust concentration monitored by the first dust sensor 3, and continuing to simulate the adjustment of the mesh size of the second layer to 48um, the dust concentration data obtained by the second dust sensor 7 is less than 20% of the dust concentration monitored by the first dust sensor 3. Finally, the number of metal mesh layers is adjusted to 2, and the mesh sizes are 190um and 48um respectively. The number of metal mesh layers and mesh size data are fed back to the control system, and the control system adjusts the number of metal mesh layers and the mesh size of the metal mesh to be consistent with the simulation data. The dust distribution obtained by the second dust sensor 7 is as follows: Figure 3 As shown, the dust concentration dropped to 1200ug / m 3 Below, dust concentration before filtration 6000ug / m 3 ~100000ug / m 3 , and large particles larger than 100um are completely filtered. The dust concentration data after passing through the third filter module 16 is monitored by the fourth dust sensor 17 to obtain a dust distribution diagram as shown in the figure below. Figure 4 As shown, the dust concentration was monitored to be reduced to 160ug / m 3 Below, the dust concentration after filtration is less than one tenth of the level before filtration.

[0065] When the filter of the present invention is in use, a dust shield can be arranged in front of the filter module, such as using a high-density sponge to buffer the dust and a metal mesh to promote the sedimentation of the dust to perform primary filtration of larger dust.

[0066] The present invention realizes intelligent adjustment of the filtration module through the statistical results of dust particle size and quantity distribution combined with simulation technology, thereby achieving good filtration effect and reducing the risks of wear, jamming, corrosion, etc. of the internal environment of the equipment caused by sand and dust.

[0067] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A long-lasting dust filter for a Shagohuang environment, comprising a housing and a first filter module, a second filter module and a third filter module arranged in the housing, wherein external air enters the housing through an air inlet on the housing and is filtered in sequence by the first filter module, the second filter module and the third filter module, wherein: A first dust sensor and a first pressure sensor are arranged on the front side of the first filter module, a second dust sensor and a second pressure sensor are arranged between the rear side of the first filter module and the front side of the second filter module, a third dust sensor and a third pressure sensor are arranged between the rear side of the second filter module and the front side of the third filter module, and a fourth dust sensor and a fourth pressure sensor are arranged on the rear side of the third filter module; The first filter module comprises an outer frame and a multi-layer metal mesh installed on the outer frame, the multi-layer metal mesh is composed of a plurality of single-layer metal meshes stacked and movable manually or automatically, the filtering effect of the first filter module is changed by manually or automatically adjusting the number of stacked metal mesh layers, the front side of the outer frame is the air inlet side of the first filter module, the front side of the outer frame is arranged as a multi-mesh structure, the rear side of the outer frame is the air outlet side of the first filter module, the rear side of the outer frame is arranged as a non-porous surface, and an air outlet of the first filter module is provided at the upper part of the rear side of the outer frame, a dust collecting box is arranged below the first filter module, the metal mesh is composed of a plurality of adjustable metal strips crisscrossed, each metal strip is provided with a distance sensor and a power source for adjusting the position of the metal strip; The second filter module is provided with a wet filter area, a buffer area and a rotary wheel moisture absorption area from front to back. The dust-containing air passes through the wet filter area and then enters the buffer area, and then enters the rotary wheel moisture absorption area, and delivers dry air to the third filter module; The third filter module includes a coarse fiber layer, a dry layer and a fine fiber layer, wherein the coarse fiber layer filters residual dust, the dry layer absorbs water vapor, and the fine fiber layer performs re-filtration; The dust concentration before and after filtration by the first filter module, the second filter module and the third filter module is monitored by the first dust sensor, the second dust sensor, the third dust sensor and the fourth dust sensor, and the dust concentration after filtration by the first filter module is adjusted to be less than 10% to 40% of the dust concentration before filtration by adjusting the number of stacked metal mesh layers and / or the mesh size of the metal mesh, and when the dust concentration after filtration by the third filter module is greater than 10% of the dust concentration before filtration by the first filter module, the filter is cleaned and maintained or the filter module is replaced; the pressure difference before and after filtration by the first filter module, the second filter module and the third filter module is monitored by the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor, and when the pressure difference is greater than a threshold value set by the control system of the filter, the filter is cleaned and maintained or the filter module is replaced; The filter is simulated according to the dust particle size distribution and concentration level of the filter use environment, and a dust particle size simulation boundary is set. The number of metal mesh layers or the metal mesh size required to be stacked for the first filter module is determined through simulation. The dust particle size simulation boundary formula is as follows: When the Reynolds number Re related to the drag coefficient is less than 1, When the Reynolds number related to the drag coefficient is greater than 10 3 : In the formula, d is the dust particle size, η is the viscosity coefficient, g is the gravitational acceleration, ρ air is the air density, ρ sand is the dust density.

2. The Shagohuang environmental long-lasting dust filter according to claim 1 is characterized by: A smoothing mechanism is arranged in the dust collecting box, and the smoothing mechanism comprises a T-shaped structure composed of a rotating shaft and a smoothing arm, and the smoothing arm is provided with a plurality of comb teeth facing downwards.

3. The Shagohuang environment long-lasting dust filter according to claim 2 is characterized by: A height sensor is arranged in the dust box for monitoring the height of dust accumulated in the dust box.

4. The Shagohuang environmental long-lasting dust filter according to claim 1 is characterized by: The lower part of the first filter module is communicated with the dust collecting box through a spiral channel.

5. The Shagohuang environmental long-lasting dust filter according to claim 1 is characterized by: The main body of the wet filter area of ​​the second filter module is made of wet water kraft paper, and its internal structure is an oblique honeycomb structure that trends obliquely downward. A spray box is arranged above the wet filter area, and a water storage tank is arranged below the wet filter area. The water storage tank is separated into a sand and water area by a filter medium. The sand and water area is used to collect dust washed or flowing down the wet filter area. The water in the sand and water area is separated into dust and water through the filter medium. The water storage tank is connected to the spray box through a water supply pipe with a pump, and the filtered water is circulated by the pump to act on the wet filter area.

Images