Gas filtering device, control method and storage medium

Abstract

The invention provides a gas filtering device, a control method and a storage medium, and belongs to the technical field of gas filtering devices. The device comprises an outer shell of a channel structure, an air inlet and an air outlet are formed in the two ends of the outer shell and are each provided with a first opening and closing mechanism, the side wall of the outer shell is oppositely provided with a reverse blowing air opening and a collecting box which are communicated with the interior of the outer shell, and the reverse blowing air opening and the collecting box are each provided with a second opening and closing mechanism; a coarse filtering mechanism and a fine filtering mechanism are arranged in the outer shell; gas enters from the air inlet, passes through the fine filtering mechanism or the coarse filtering mechanism and the fine filtering mechanism, and is discharged from the air outlet; the collecting box is used for collecting filtered impurities; and the reverse blowing pipeline is used for performing reverse blowing on the coarse filtering mechanism and the fine filtering mechanism, an air outlet of the reverse blowing pipeline is connected with the reverse blowing air port, and an air inlet of the reverse blowing pipeline is connected with a gas conveying pipeline. The device is compact in structure, reasonable in arrangement, simple to manufacture, low in use cost, good in filtering effect and capable of effectively preventing blockage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas filtering devices, in particular to a gas filtering device, a control method of the gas filtering device and a machine storage medium. BACKGROUND

[0002] The pipeline, gate valve and interface of the compressed air system of the coal mining working face are used for a long time, the inner layer of the pipeline is seriously corroded and eroded, the rust and residue in the pipeline are pressed to form rust stains and enter the inside of the equipment, causing the blockage, jamming and even damage of the pneumatic equipment. At present, to solve the blockage problem of the compressed air system of the coal mine, the root is to collect and clean the impurities in the system in time, and to prevent the blockage of the pipeline at the end of the system. The following technologies are mainly used to solve the problem: (1) using a traditional Y-type filter, using the filtering and residue discharge function of the Y-type filter to manually open the residue discharge flange regularly to discharge the impurities out of the system and ensure the cleanliness of the system. (2) using an existing filter with automatic backflushing function to discharge the impurities out of the system by automatic backflushing and ensure the cleanliness of the system. (3) using new PVC pipes and high-pressure rubber pipes instead of steel pipes in the compressed air system of the coal mine to prevent the generation of iron rust and other impurities.

[0003] However, using the traditional Y-type filter to clean the compressed air system has many disadvantages, although it has the functions of impurity collection and residue discharge. First, it needs to manually open the residue discharge flange regularly for residue discharge, which is uncontrollable by human factors and has the risk that the impurities in the system cannot be discharged in time. Second, due to the influence of the underground environment of the coal mine, the bolts of the residue discharge flange are easily corroded and difficult to open for residue discharge, which causes the impurities to be discharged out of the system and the system to be paralyzed, the filter or the flange bolt needs to be replaced manually frequently according to the situation, the cost is high, and third, the filtering precision of the general Y-type filter is not high, it can only filter large particles, and small impurities can still enter the inside of the equipment to cause damage to the equipment. Because the impurities are too much and too rigid, the filter has difficulty in residue discharge or the residue discharge flange is corroded and cannot discharge the residue, the filtering effect is difficult to guarantee, which causes problems such as large running resistance, high load and small air pressure of the compressed air system, regular personnel need to be coordinated to remove and clean the pipeline of the compressed air system, which seriously affects the normal operation of the pneumatic equipment such as the pneumatic monorail hoist, the pneumatic anchor rod machine and the pneumatic diaphragm pump, and restricts the normal and safe production of the coal mine.

[0004] Although the existing automatic backwash filtration technology meets the requirements in terms of filtration accuracy and slag discharge, it has the following problems. First, the technology is currently only applicable to high-pressure medium systems, and its corresponding equipment is expensive, complex in structure, and large in size. Second, the filtration is single-pole filtration, and the filtration effect is poor. Although the filtration accuracy is high, when it is put into a low-pressure system, the system operation resistance is extremely large, the pressure decay is severe, and it is easy to form filter cake filtration and gradual clogging on the surface of the filter element. Two system clogging effects. Third, the automatic backwash design is a pressure differential backwash, and the sensor sensitivity is 1-5MPa. The pressure of the low-pressure system (generally 0.5-0.7MPa) cannot drive the normal operation of the backwash system.

[0005] Although using new PVC pipes and high-pressure hoses instead of steel pipes can solve the problem of compressed air system, the existing compressed air system pipelines in coal mines are complicated and the replacement project is large. In addition, field tests have shown that PVC pipes and high-pressure hoses have problems with pipe lining falling off and rubber chips clogging the system after long-term use. At the same time, they are subject to weathering and aging, and their durability is not as good as steel pipes. Summary of the Invention

[0006] The purpose of the embodiments of the present invention is to provide a gas filtering device, a control method and a storage medium to solve the above-mentioned problems of high use and maintenance costs, poor filtering effect, easy clogging and the like.

[0007] In order to achieve the above-mentioned object, an embodiment of the present invention provides a gas filtering device, comprising: An outer shell of a channel structure, wherein the two ends of the outer shell are an air inlet and an air outlet, and the air inlet and the air outlet are both provided with a first opening and closing mechanism, and a back-blowing air port and a collection box connected to the interior of the outer shell are relatively provided on the side wall of the outer shell, and the back-blowing air port and the collection box are both provided with a second opening and closing mechanism, and a coarse filtering mechanism and a fine filtering mechanism are provided inside the outer shell; gas enters through the air inlet, passes through the fine filtering mechanism or passes through the coarse filtering mechanism and the fine filtering mechanism, and is discharged from the air outlet; the collection box is used to collect filtered impurities; The back-blowing pipe is used for back-blowing the coarse filtering mechanism and the fine filtering mechanism, the air outlet of the back-blowing pipe is connected to the back-blowing air port, and the air inlet of the back-blowing pipe is connected to the gas delivery pipe.

[0008] Optionally, the device further includes: A controller is connected to the first opening and closing mechanism and the second opening and closing mechanism, and is used to control the opening and closing states of the first opening and closing mechanism and the second opening and closing mechanism.

[0009] Optionally, the collection box is a truncated cone structure.

[0010] Optionally, flanges are provided at both ends of the outer shell, and through holes serving as air inlets and air outlets are provided on the flanges; The flange plate is provided with a limiting protrusion, and the two ends of the fine filtering mechanism are located in the corresponding limiting protrusions respectively.

[0011] Optionally, the coarse filtering mechanism is detachably connected with the inner wall of the outer shell, and a moving channel is formed between the coarse filtering mechanism and the blowback air outlet and the collection box.

[0012] Optionally, the coarse filtering mechanism comprises: an internally hollow mounting cylinder; a plurality of filters which are arranged at intervals in the mounting cylinder, and the filtering sizes of the plurality of filters are sequentially reduced in the direction of gas flow; a retaining cylinder which is located in the mounting cylinder through the center of each filter.

[0013] Optionally, the fine filtering mechanism is a cylindrical filter cartridge, and the filter cartridge passes through the retaining cylinder.

[0014] In a second aspect, the present application provides a control method of a gas filtering device, which is applied to the above-mentioned gas filtering device, and the method comprises: calculating the time interval length between the current time and the last blowback end time; if the time interval length reaches a preset first time length, controlling the first opening and closing mechanism to be closed and the second opening and closing mechanism to be opened; after a preset second time length is elapsed since the time when the second opening and closing mechanism is opened, controlling the first opening and closing mechanism to be opened and the second opening and closing mechanism to be closed.

[0015] Optionally, the method further comprises: real-time acquisition of the pressure values of the air inlet and the air outlet of the outer shell; if the difference between the pressure value of the air inlet and the pressure value of the air outlet is greater than a set pressure threshold value, controlling the first opening and closing mechanism to be closed and the second opening and closing mechanism to be opened; after a preset third time length is elapsed since the time when the second opening and closing mechanism is opened, controlling the first opening and closing mechanism to be opened and the second opening and closing mechanism to be closed.

[0016] In another aspect, the present application provides a readable storage medium, which has instructions stored thereon, and the instructions are used to make a machine execute the above-mentioned control method of the gas filtering device.

[0017] The technical solution realizes hierarchical filtering through the arrangement of the coarse filtering mechanism and the fine filtering mechanism, has good filtering effect, and has compact overall structure, reasonable arrangement, simple manufacturing, low maintenance cost and low use cost; the blowback pipeline arranged at the same time can blowback the coarse filtering mechanism and the fine filtering mechanism, effectively preventing blockage.

[0018] Other features and advantages of the embodiments of the present application will be described in detail in the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and serve to explain the embodiments of the application, but do not limit the embodiments of the application. In the drawings: Figure 1 is a cross-sectional structure schematic diagram of the gas filtering device provided by the present application; Figure 2 is a structure block diagram of the gas filtering device provided by the present application; Figure 3 is a cross-sectional structure schematic diagram of the coarse filtering machine provided by the present application; Figure 4 is a flow chart of the control method of the first gas filtering device provided by the present application; Figure 5 is a flow chart of the control method of the first gas filtering device provided by the present application; Figure 6 is a blockage simulation schematic diagram provided by the present application.

[0020] Explanation of reference signs 1-outer shell; 101-inlet; 102-outlet; 103-moving channel; 11-back blowing port; 12-collection box; 13-flange; 131-limiting protrusion; 2-first opening and closing mechanism; 3-second opening and closing mechanism; 4-coarse filtering mechanism; 41-mounting cylinder; 42-filter; 43-retaining cylinder; 5-fine filtering mechanism; 6-back blowing pipeline; 7-gas conveying pipeline; 8-controller. DETAILED DESCRIPTION

[0021] The specific embodiments of the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application.

[0022] In the embodiments of the present application, the orientation words such as "up, down, left, right" used without the opposite description generally refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is used.

[0023] The terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0024] The terms "parallel", "perpendicular", and the like do not mean that the components must be absolutely parallel or perpendicular, but can be slightly inclined. For example, "parallel" only means that its direction is more parallel relative to "perpendicular", and does not mean that the structure must be completely parallel, but can be slightly inclined.

[0025] The terms "horizontal", "vertical", "overhanging", and the like do not mean that the components must be absolutely horizontal, vertical, or overhanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0026] In addition, the terms "approximately", "substantially", and the like are intended to indicate that the relevant content is not required to be absolutely accurate, but can have some deviation. For example, "approximately equal" does not only mean absolute equality, because in actual production and operation, it is difficult to achieve absolute "equality", and generally there is some deviation. Therefore, in addition to absolute equality, "approximately equal" also includes the above-mentioned case of having some deviation. By way of example, in other cases, unless otherwise specified, the terms "approximately", "substantially", and the like have similar meanings as described above.

[0027] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0028] Figure 1 is a cross-sectional structure schematic diagram of the gas filtering device provided by the present application; Figure 2 is a structure block diagram of the gas filtering device provided by the present application; Figure 3 is a cross-sectional structure schematic diagram of the coarse filtering machine provided by the present application; Figure 4 is a flow chart of the control method of the first gas filtering device provided by the present application; Figure 5 is a flow chart of the control method of the first gas filtering device provided by the present application; Figure 6 is a blockage simulation schematic diagram provided by the present application.

[0029] As shown in Figures 1-2 The present embodiment provides a gas filtering device, which comprises: The shell 1 of the channel structure, two ends of the shell 1 are an air inlet 101 and an air outlet 102, the air inlet 101 and the air outlet 102 are provided with a first opening and closing mechanism 2, opposite sides of the shell 1 are provided with a back-blowing air inlet 11 and a collection box 12 which are in communication with the inside of the shell 1, the back-blowing air inlet 11 and the collection box 12 are provided with a second opening and closing mechanism 3, the inside of the shell 1 is provided with a rough filter mechanism 4 and a fine filter mechanism 5; gas enters from the air inlet 101, is discharged from the air outlet 102 after passing through the fine filter mechanism 5 or passing through the rough filter mechanism 4 and the fine filter mechanism 5; the collection box 12 is used for collecting impurities filtered out. A back-blowing pipeline 6 is used for back-blowing the rough filter mechanism 4 and the fine filter mechanism 5, an air outlet of the back-blowing pipeline 6 is connected to the back-blowing air inlet 11, and an air inlet of the back-blowing pipeline 6 is connected to a gas conveying pipeline 7.

[0030] Specifically, in the embodiment, the rough filter mechanism 4 is sleeved on the outer surface of the fine filter mechanism 5, and then the rough filter mechanism 4 is installed in the shell 1, so that the installation and fixation of the rough filter mechanism 4 and the fine filter mechanism 5 are realized, and the rough filter mechanism 4 is located between the back-blowing air inlet 11 and the collection box 12. In the normal case of filtering gas, the first opening and closing mechanism 2 is in an open state, and the second opening and closing mechanism 3 is in a closed state, so that the gas is discharged from the air outlet 102 of the shell 1 only after passing through the fine filter mechanism 5, or sequentially passes through the rough filter mechanism 4 and the fine filter mechanism 5 and is then discharged from the air outlet 102 of the shell 1 (black arrow flow direction), at this time, the collection box 12 is used for collecting impurities filtered out, and the impurities fall into the collection box 12 due to their own gravity; in the normal case of back-blowing the rough filter mechanism 4 and the fine filter mechanism 5, the first opening and closing mechanism 2 is in a closed state, and the second opening and closing mechanism 3 is in an open state, so that the gas enters from the back-blowing air inlet 11 through the back-blowing pipeline 6, back-blowing the rough filter mechanism 4 and the fine filter mechanism 5, and then is discharged outward from the collection box 12 (red arrow flow direction). The first opening and closing mechanism 2 and the second opening and closing mechanism 3 can both be electric ball valves.

[0031] In summary, the scheme sets the rough filter mechanism 4 and the fine filter mechanism 5, achieves a two-stage simultaneous filtering function, and can eliminate the two kinds of plugging effects of filter cake filtering and gradual plugging which often occur in low-pressure systems such as compressed air, reduce system operation resistance, and improve filtering precision and effect.

[0032] Further, the device further comprises: A controller 8 connected with the first opening and closing mechanism 2 and the second opening and closing mechanism 3, used for controlling the opening and closing states of the first opening and closing mechanism 2 and the second opening and closing mechanism 3.

[0033] Specifically, in the embodiment, the controller 8 can be a PLC controller. The controller 8 controls the opening and closing states of the first opening and closing mechanism 2 and the second opening and closing mechanism 3, which can realize automatic control, thereby reducing the workload of the operator, eliminating the risk of incomplete system impurity discharge caused by human factors, and improving the system operation efficiency.

[0034] Further, the collection box 12 has a circular truncated cone structure.

[0035] Specifically, in the embodiment, in this way, the collection box 12 can better collect impurities, and the circular truncated cone structure forms a structure that is small at the top and large at the bottom, thereby reducing the speed of airflow outflow and improving the backwashing effect.

[0036] Further, the two end portions of the outer shell 1 are provided with flanges 13, and the flanges 13 are provided with through holes as the air inlets 101 and air outlets 102 of the outer shell 1. The flanges 13 are provided with limiting protrusions 131, and the two ends of the fine filtering mechanism 5 are located in the corresponding limiting protrusions 131.

[0037] Specifically, in the embodiment, the two end portions of the outer shell 1 are provided with flanges 13, and the flanges 13 are provided with through holes as the air inlets 101 and air outlets 102 of the outer shell 1. The air inlets 101 of the outer shell 1 can be provided as multiple, and the air inlets 101 are symmetrically distributed with the midpoint position of the flange 13 as the center to supply gas. The air outlet 102 of the outer shell 1 can be provided as one, and is located at the midpoint position of the flange 13. In order to further limit the position of the fine filtering mechanism 5, limiting protrusions 131 are arranged on the opposite faces (the faces inside the outer shell 1) of the two flanges 13, and the two ends of the fine filtering mechanism 5 are located in the corresponding limiting protrusions 131 after installation.

[0038] Further, the coarse filtering mechanism 4 is detachably connected with the inner wall of the outer shell 1, and the coarse filtering mechanism 4 and the backwashing air outlet 11 and the collection box 12 form a moving channel 103.

[0039] Specifically, in this embodiment, since the backblowing air port 11 and the collection box 12 are relatively arranged on the outer shell 1, a certain space is formed between the backblowing air port 11 and the collection box 12. After the coarse filter mechanism 4 is installed on the inner wall of the outer shell 1, the movable channel 103 formed between the coarse filter mechanism 4 and the backblowing air port 11 serves as a movable channel for the gas during backblowing, so that the gas can be blown toward the coarse filter mechanism 4 and the fine filter mechanism 5 during backblowing; the movable channel 103 formed between the coarse filter mechanism 4 and the collection box 12 serves as a movable channel for the gas and impurities during backblowing, so that the gas and impurities can enter the collection box 12 and be discharged outward.

[0040] In another embodiment, the coarse filtering mechanism 4 is detachably connected to the inner wall of the outer shell 1 by a retaining spring or a threaded connection.

[0041] Furthermore, if Figure 4 As shown, the coarse filtering mechanism 4 includes: A mounting cylinder 41 having a hollow interior; Multi-stage filters 42 are spaced apart and arranged in the mounting cylinder 41 , and the filter sizes of the multi-stage filters 42 decrease in the direction of gas flow; A retaining cylinder 43 is located inside the mounting cylinder 41 through the center of each filter 42 .

[0042] Specifically, in this embodiment, in order to ensure the filtering effect of the coarse filtering mechanism 4, the multi-stage filter 42 is arranged in sequence inside the mounting cylinder 41 at intervals, and the filtering size of the multi-stage filter 42 is reduced in sequence according to the gas flow direction, and the gas passes through the filters 42 of different filtering sizes in sequence, thereby achieving the filtering of impurities of different sizes; the retaining cylinder 43 is a hollow cylindrical structure, which can not only achieve the limitation of the filter 42, but also be used to fix the fine filtering mechanism 5.

[0043] More specifically, the multi-stage filter 42 adopts a three-stage disc structure (three-stage filter 42). The first-stage coarse filter and the first-stage isolation grid filter steel yarn filter impurities above 1000um, the second-stage isolation grid filter steel yarn filters impurities of 500-1000um, and the third-stage isolation grid filter steel yarn filters impurities of 200-500um.

[0044] More specifically, in the present embodiment, for the filtration of a constant flow rate medium by the coarse filtration mechanism 4, there are generally two kinds of clogging models, one is that the pressure rises linearly with time, that is, filter cake filtration, this type of clogging usually occurs when there are larger rigid particles in the medium, a filter cake layer is formed on the surface of the filter, which does not cause complete clogging of the filter element, and increasing the medium pressure can meet the use needs, but it will cause the system load to increase, causing pressure damage to the filter element. Another clogging model is gradual clogging, which is generally smaller soft particles, this kind of clogging will cause complete clogging of the filter element, eventually causing the system to be paralyzed, as shown in Figure 6 In summary, the first-stage coarse filtration needs to filter larger rigid particles to avoid the formation of filter cake, and the second-stage fine filtration needs to filter small particles and achieve automatic backflushing to avoid gradual clogging. Therefore, the strength, accuracy, arrangement form and compressed air flow area of the first-stage coarse filtration membrane all need to meet the requirements.

[0045] The larger rigid particles (200 um or more) in the compressed air system are generally steel and iron rust residues in the system. After the system is pressurized, rust residues cannot be formed. If such impurities enter the equipment, they can easily cause abrasive damage to the equipment. Considering that the diameters of the larger particles are different, to ensure the effective compressed air flow area and minimize the compressed air resistance, and to avoid filter cake filtration in the second-stage fine filter, a separation grid type first-stage coarse filter is designed. This filtration uses the principle of screening, which gradually separates and screens rigid particles of different particle sizes, and uses the weight of the rigid particles to store them in the collection box, which is periodically discharged.

[0046] The separation grid type first-stage coarse filter is a circular filter screen made of steel yarns of different accuracies according to the inner diameter of the shell, which is uniformly installed above the collection box or the slag discharge port. At the same time, during manufacturing, installation holes are reserved according to the outer diameter of the second-stage fine filter element, and the installation holes are surrounded by stainless steel.

[0047] The filtration resistance of the coarse filtration mechanism 4 is calculated by the following scheme: The resistance of air flow in the air pipe has two types. One is the friction resistance or the along-the-way resistance caused by the viscosity of air itself and the friction between air and the pipe wall. The other is the local resistance caused by the change in flow rate and direction and the vortex flow when air flows through pipe fittings and equipment in the air pipe. ① Friction resistance: According to the principle of fluid mechanics, the friction resistance of air flowing in a circular pipe with a constant cross-sectional shape is calculated as follows: ; The friction resistance per unit length of the circular air pipe (specific friction resistance) is: ; wherein, is the friction resistance coefficient; is the average flow velocity of air in the duct, m / s; is the density of air, Kg / m 3 ; l is the length of the duct, m; D is the diameter of the circular duct; ; is the hydraulic radius of the duct, m; f is the cross-sectional area of the portion of the duct filled with fluid, m 2 ; P is the wetted perimeter, which is the perimeter of the duct in a ventilation and air conditioning system, m; The air friction coefficient is: ; wherein, C is the air resistance coefficient, which is generally constant, and is taken as 0.1-0.14, taken as 0.1; is the density of air, Kg / m3; taken as 1.29 Kg / m 3 ; S is the windward area, m 2 ; that is, the ventilation area of the pipeline S = 0.0177 m 2 ; is the relative velocity of the object and air; taken as 13 m / s.

[0048] Through calculation, λ = 0.386; According to the overall design length of the first-stage coarse filter, l = 600 mm; Rs = f / P = 0.0177 x 0.471 x 0.15 = 0.07, and the friction resistance ΔPm of the filter is obtained by bringing the above formulae into the formula; ΔPm = 0.0386 x 13 x 2 x 1.29 x 6 / 0.3 = 2.6 Pa.

[0049] ②Local resistance: when the pipe fittings with changes in air flow cross-section (such as various reducing pipes, air duct inlets and outlets, valves, filters), flow direction (elbows), and flow rate (such as tees, wyes, and side air supply and exhaust ports of air ducts) are used, local resistance will be generated. The local resistance is calculated according to the following formula: ; wherein, is the local resistance coefficient.

[0050] The first-stage coarse filter is a separation grid type steel wire filter, so the filter can be considered as a duct with a grid, and the local resistance coefficient should be corrected as follows: When the side wall is thin, i.e. σ / D < 0.05, ξ = 1 + ξs; When the side wall is thick, i.e. σ / D>0.05, ξ=ξ0+ξs; DN150 air pipe wall thickness σ=10mm, side wall ratio σ / D=10 / 150=0.07, so the local resistance coefficient is corrected according to ξ=ξ0+ξs, wherein: ξ0 is the local resistance coefficient of the pipe fitting, and ξ0=0.5 is taken; ξs is the local resistance coefficient of the grid, and ξs=0.58 is taken; ξ=1.8; ΔPn=ξν2ρ / 2D =1.08×13×1.29 / 0.15=120.7Pa≈0.121KPa; Considering that the primary coarse filtration is a three-machine isolation grid filter, ΔPn1=3ΔPn=0.363KPa; ΔP=ΔPm+ΔPn1=0.363+0.003=0.37KPa.

[0051] In summary, the rated pressure of the coal mine mine pressure air system is generally 0.5-0.7MPa, so the filter meets the resistance requirement of the pressure air system and can meet the production needs.

[0052] For coarse filtration precision selection: The pressure air system mainly forms rust slag particles directly: 80um-2000um, so the filter can adopt the following specifications: The primary filter 42 has a filtration precision of 1000um round grid steel wire; The secondary filter 42 has a filtration precision of 500um round grid steel wire; The secondary filter 42 has a filtration precision of 200um round grid steel wire.

[0053] Further, the fine filtration mechanism 5 is a cylindrical filter cartridge, and the filter cartridge passes through the retaining cylinder 43.

[0054] Specifically, in the embodiment, in order to realize the fixation of the fine filtration mechanism 5, the coarse filtration mechanism 4 is arranged to include the retaining cylinder 43, and the fine filtration mechanism 5 is arranged to be a cylindrical filter cartridge, and the filter cartridge is inserted into the retaining cylinder 43 to realize the limiting of the fine filtration mechanism 5. After the fine filtration mechanism 5 is installed, the fine filtration mechanism 5 is located at the middle part of the outer shell 1 and does not contact the inner wall of the outer shell 1, so as to ensure the filtration effect.

[0055] More specifically, considering that the pipe type of the coal mine pressure air system is flange connection type DN150, in order to facilitate system installation and slag removal, the secondary filtration structure is selected as a cylindrical barrel type structure, and the precision is selected: the pressure of the mine pressure air system is generally 0.5-0.7Mpa, and the rust stain in the system pipeline forms rust under pressure, and the minimum particle size is about 80-120um, so the secondary precision is selected as 80um, and the diameter is Ф80mm.

[0056] More specifically, in the present embodiment, as indicated by the arrow in Figure 1 After the gas enters the outer shell 1 from the air inlet 101, it is divided into two filtration directions, a small part of the gas is directly filtered by the front half of the fine filter mechanism 5 and then discharged outwardly from the air outlet 102 of the outer shell 1, and the other part of the gas moves inside the outer shell 1, is filtered by the coarse filter mechanism 4, and then is filtered by the rear half of the fine filter mechanism 5 and then discharged outwardly from the air outlet 102 of the outer shell 1.

[0057] Through the above scheme, the present application can achieve the following technical effects: 1. The flange interface slag removal mode of the traditional Y-type filter is changed to electric ball valve control, which avoids the problem of rust caused by the influence of the coal mine underground environment and makes the coal mine pressure air system and other low-pressure systems clean and purified more automatically through PLC program control technology, thereby eliminating the situation of untimely and inadequate slag removal caused by human factors and providing a strong guarantee for reliable operation of the mine pressure air system.

[0058] 2. The integrated two-stage gas filtration device is designed with a self-backflushing function, compact structure, reasonable arrangement and simple manufacturing, and the materials used are simple and easy to obtain.

[0059] 3. The coarse filter and the fine filter are integrated, the structure is compact, the filtration precision is greatly improved, and two-stage filtration can be realized at the same time, so that the filtration effect of the coal mine pressure air system is more reliable.

[0060] 4. The first-stage and second-stage filtration modes (the coarse filter mechanism 4 and the fine filter mechanism 5) are designed, the first-stage coarse filter is used to filter large particles, the second-stage fine filter is used to filter small particles, and the regular backflushing function is used, so that the two system blockage effects of filter cake formation and gradual blockage during the operation of the pressure air system are reasonably avoided.

[0061] 5. The regular and irregular backflushing modes of the pressure air system are developed by using the PLC program control technology, which makes up for the blank of the coal mine low-pressure system lacking of backwashing filtration system.

[0062] 6. The first and second filters (the coarse filter 4 and the fine filter 5) are combined with automatic backwashing, effectively improving the purification efficiency of the system, reducing the system operation resistance and load, and laying a foundation for efficient operation of the coal mine compressed air system.

[0063] 7. The gas filter device operates independently, eliminating the problems of maintenance, upgrading and transformation of the compressed air system, and also avoiding the process of frequently opening the deslagging flange and pipeline for deslagging, thereby reducing the labor intensity.

[0064] As shown in Figure 4 the embodiment also provides a control method of the gas filter device, which is applied to the gas filter device and includes the following steps. calculating a time interval length between a current time and a last backwashing end time; if the time interval length reaches a preset first time length, controlling the first opening and closing mechanism to be closed and the second opening and closing mechanism to be opened; after a preset second time length is elapsed since the time when the second opening and closing mechanism is opened, controlling the first opening and closing mechanism to be opened and the second opening and closing mechanism to be closed.

[0065] Specifically, in the embodiment, since impurities may be attached to the coarse filter and the fine filter after a period of work in the process of filtering the gas in daily life, the filter effect is affected due to the blockage. Therefore, in the embodiment, the preset first time length is set as the time interval of backwashing according to the cleanliness of the gas. When the time interval length from the last backwashing end time reaches the preset first time length, the first opening and closing mechanism is controlled to be closed and the second opening and closing mechanism is controlled to be opened, so as to backwash the coarse filter and the fine filter. After a preset second time length is elapsed since the time when the second opening and closing mechanism is opened, the first opening and closing mechanism is controlled to be opened and the second opening and closing mechanism is controlled to be closed. In this way, the backwashing can be realized at a fixed time, so as to effectively avoid the blockage of the coarse filter and the fine filter and ensure the filter effect.

[0066] As shown in Figure 5 the embodiment also provides a control method of the gas filter device, which further includes the following steps. real-time acquiring pressure values of an air inlet and an air outlet of the outer shell; if a difference between the pressure value of the air inlet and the pressure value of the air outlet is greater than a set pressure threshold, controlling the first opening and closing mechanism to be closed and the second opening and closing mechanism to be opened; after a preset third time length is elapsed since the time when the second opening and closing mechanism is opened, controlling the first opening and closing mechanism to be opened and the second opening and closing mechanism to be closed.

[0067] Specifically, in the present embodiment, although the back-flushing of the coarse filter mechanism and the fine filter mechanism has been timed according to the set time interval length, in some special cases, there can be a situation that the next back-flushing time has not arrived, but the coarse filter mechanism and the fine filter mechanism have been blocked to a large extent. Therefore, in order to avoid this situation, the pressure values of the air inlet and the air outlet of the outer shell are obtained in real time. If the difference between the pressure value of the air inlet and the pressure value of the air outlet is greater than a set pressure threshold, it indicates that there is a certain blockage, the first opening and closing mechanism is controlled to be closed, the second opening and closing mechanism is controlled to be opened, and the coarse filter mechanism and the fine filter mechanism are back-flushed. After a preset third time length from the time when the second opening and closing mechanism is opened, the first opening and closing mechanism is controlled to be opened, and the second opening and closing mechanism is controlled to be closed, effectively avoiding the blockage of the coarse filter mechanism and the fine filter mechanism, and ensuring the filtering effect.

[0068] The present embodiment also provides a readable storage medium, which stores instructions for causing a machine to execute the control method of the gas filter device.

[0069] The above describes the optional embodiments of the present embodiment in detail in combination with the drawings, but the present embodiment is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present embodiment within the technical concept of the present embodiment, and these simple modifications all belong to the protection scope of the present embodiment.

[0070] Those skilled in the art can understand that all or part of the steps of the above-mentioned embodiment methods can be completed by programs instructing related hardware, the programs are stored in a storage medium, and include a plurality of instructions for causing a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk and various program code storage media.

[0071] The above describes the optional embodiments of the present embodiment in detail in combination with the drawings, but the present embodiment is not limited to the specific details in the above embodiments, and various simple modifications can be made to the technical solutions of the present embodiment within the technical concept of the present embodiment, and these simple modifications all belong to the protection scope of the present embodiment. In addition, it should be noted that various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the present embodiment Besides, the various different embodiments of the embodiments of the present application can also be combined arbitrarily, as long as the idea of the embodiments of the present application is not violated, which should be considered as the disclosed content of the embodiments of the present application.

Claims

1. A gas filtering device, characterized in that: The device comprises: An outer shell (1) of a channel structure, wherein the two ends of the outer shell (1) are an air inlet (101) and an air outlet (102), and the air inlet (101) and the air outlet (102) are both provided with a first opening and closing mechanism (2), and a back-blowing air port (11) and a collection box (12) communicating with the interior of the outer shell (1) are relatively provided on the side wall of the outer shell (1), and the back-blowing air port (11) and the collection box (12) are both provided with a second opening and closing mechanism (3), and a coarse filtering mechanism (4) and a fine filtering mechanism (5) are provided inside the outer shell (1); gas enters through the air inlet (101), passes through the fine filtering mechanism (5) or passes through the coarse filtering mechanism (4) and the fine filtering mechanism (5), and is discharged through the air outlet (102); the collection box (12) is used to collect filtered impurities; The back-flushing pipe (6) is used for back-flushing the coarse filtering mechanism (4) and the fine filtering mechanism (5), wherein the air outlet of the back-flushing pipe (6) is connected to the back-flushing air outlet (11), and the air inlet of the back-flushing pipe (6) is connected to the gas delivery pipe (7).

2. The gas filtering device according to claim 1, characterized in that The device further comprises: A controller (8) is connected to the first opening and closing mechanism (2) and the second opening and closing mechanism (3), and is used to control the opening and closing states of the first opening and closing mechanism (2) and the second opening and closing mechanism (3).

3. The gas filtering device according to claim 1, characterized in that The collecting box (12) is a truncated cone-shaped structure.

4. The gas filtering device according to claim 1, characterized in that Both ends of the outer shell (1) are provided with flanges (13), and the flanges (13) are provided with through holes serving as an air inlet (101) and an air outlet (102); A limiting protrusion (131) is provided on the flange (13), and the two ends of the fine filtering mechanism (5) are respectively located in the corresponding limiting protrusions (131).

5. The gas filtering device according to claim 1, characterized in that The coarse filtering mechanism (4) is detachably connected to the inner wall of the outer shell (1), and a movable channel (103) is formed between the coarse filtering mechanism (4), the back-blowing air port (11), and the collecting box (12).

6. The gas filtering device according to claim 1, characterized in that The coarse filtering mechanism (4) comprises: An internally hollow mounting cylinder (41); Multi-stage filters (42) are arranged at intervals in the mounting cylinder (41), and the filter sizes of the multi-stage filters (42) decrease in sequence according to the gas flow direction; A retaining cylinder (43) is located in the mounting cylinder (41) through the center of each filter (42).

7. The gas filtering device according to claim 6, characterized in that: The fine filtering mechanism (5) is a cylindrical filter element, and the filter element passes through the retaining cylinder (43).

8. A method for controlling a gas filter device, applied to the gas filter device according to any one of claims 1 to 7, characterized in that: The method comprises: Calculate the time interval between the current moment and the end moment of the last backflush; If the time interval reaches a preset first time length, the first opening and closing mechanism is controlled to close, and the second opening and closing mechanism is controlled to open; After a preset second time length has passed since the moment the second opening and closing mechanism is opened, the first opening and closing mechanism is controlled to open, and the second opening and closing mechanism is controlled to close.

9. The control method of the gas filtering device according to claim 8, characterized in that: The method further comprises: Obtain the pressure values ​​of the air inlet and outlet of the outer shell in real time; If the difference between the pressure value of the air inlet and the pressure value of the air outlet is greater than the set pressure threshold, the first opening and closing mechanism is controlled to close and the second opening and closing mechanism is controlled to open; After a preset third time period has passed since the second opening and closing mechanism is opened, the first opening and closing mechanism is controlled to open, and the second opening and closing mechanism is controlled to close.

10. A readable storage medium having instructions stored thereon, characterized in that: The instruction is used to enable the machine to execute the control method of the gas filtering device according to any one of claims 8 to 9.

Images