A cloth bag dust collector

Abstract

This invention relates to the field of dust removal equipment, specifically a baghouse dust collector, including a dust collection tower. The dust collection tower contains several conventional filter cartridges arranged in an array. Inside each conventional filter cartridge, a fine filter cartridge is installed via a connecting assembly to replace the dust cake layer. The dust collector also includes a valve assembly for controlling the airflow. This invention uses fine filter cartridges to replace the dust cake layer outside the conventional filter cartridges, thereby enabling the fine filter cartridges to filter submicron-sized dust. This prevents a large amount of fine dust from penetrating the filter cartridges before the dust cake layer rebuilds after cleaning, thus preventing emission peaks and ensuring the stability of emission concentrations. This invention uses a valve frame to seal and protect the fine filter cartridges, and allows pulsed airflow to enter the interior of the conventional filter cartridges for pulse cleaning. Finally, the outlet airflow of the fine filter cartridges is opened, allowing the airflow to pass sequentially through the conventional filter cartridges and the fine filter cartridges, thereby enabling the fine filter cartridges to replace the dust cake layer for filtration.

Description

Technical Field

[0001] This invention relates to the field of dust removal equipment, specifically a bag filter dust collector. Background Technology

[0002] A baghouse dust collector is a dry dust removal device that uses filter bags (or filter cartridges) made of fiber fabric to filter dust-laden gas. It is widely used in the treatment of smoke and dust in industries such as steel, cement, power, and chemical. When working, dust is trapped on the outer surface of the filter cartridge to form a dust layer, while clean gas passes through the filter cartridge and is discharged, thus achieving gas-solid separation. Small baghouse dust collectors usually include 6 to 8 filter cartridges.

[0003] The high-efficiency filtration of baghouse dust collectors mainly relies on the dust cake layer formed on the surface of the filter cartridge. During the filtration stage, when dust-laden gas passes through the filter cartridge, larger dust particles are captured by the fibers due to inertial collision and interception effects, and gradually accumulate on the surface of the filter cartridge to form a dust cake layer. Smaller fine dust particles are intercepted by the dust cake layer. The dust cake layer itself has a dense pore structure and is the key medium for filtering submicron dust. However, as the filtration time increases, the dust cake layer continues to thicken, and the operating resistance of the equipment gradually increases. When the resistance reaches the set value, the dust removal system needs to be activated to clean the filter cartridge in order to restore the air permeability of the filter cartridge.

[0004] Currently, the most widely used dust removal method is compartmentalized offline pulse jet cleaning. This technology divides the dust collector into several independent compartments, each equipped with an independent offline valve and pulse jet cleaning device. During cleaning, the control system first closes the offline valve of the compartment to be cleaned, cutting off the filtration airflow to that compartment and putting it in an offline state. Then, the pulse valve is opened, and compressed air is instantly injected into the filter cartridge, causing the filter cartridge to expand and vibrate rapidly. The dust cake layer attached to the outer surface of the filter cartridge is peeled off under the dual action of reverse airflow and mechanical vibration and falls into the dust hopper. After the peeled dust has settled, the offline valve is opened again to restore the filtration function of that compartment.

[0005] However, the existing compartment offline pulse cleaning technology still has a technical challenge: the emission concentration increases significantly immediately after cleaning. The root cause is that the powder cake layer on the surface of the filter cartridge is excessively removed during the cleaning process. Consequently, in the early stage of filtration recovery, the filter cartridge loses the fine filtration capability of the powder cake layer. Since the pores of the filter cartridge fibers themselves are relatively large, usually 10-50μm, it is difficult to effectively intercept submicron dust. As a result, a large amount of fine dust penetrates the filter cartridge within several minutes to tens of minutes before the powder cake layer is rebuilt, forming emission peaks.

[0006] Actual test data shows that the dust concentration at the outlet can be several times or even dozens of times higher than that during steady-state operation in a short period of time after dust removal. Under some operating conditions, the peak concentration can reach 30-50 mg / m³ or more, which seriously affects the stable compliance of ultra-low emissions of <5 mg / m³ or <10 mg / m³. Therefore, how to effectively maintain filtration capacity and eliminate instantaneous emission peaks after dust removal is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a bag filter dust collector, including a dust collection tower, a plurality of conventional filter cartridges arranged in an array are provided inside the dust collection tower, and fine filter cartridges for replacing the powder cake layer are provided inside the conventional filter cartridges through connecting components. The dust collector also includes a valve assembly for controlling the air path.

[0008] The connecting assembly includes a connecting cover that is detachably connected to the dust collector tower. An inner cylinder frame corresponding to the connecting cover is fixedly connected to the dust collector tower. A conventional filter cartridge cover is located on the coaxial outer side of the inner cylinder frame and is threadedly connected to the connecting cover. An air guide tube is rotatably sealed inside the connecting cover. A fine filter cartridge is inserted on the coaxial inner side of the inner cylinder frame and is threadedly connected to the air guide tube.

[0009] The inner cylinder frame is equipped with a rotatable valve. After the conventional filter cartridges are cleaned, the valve is rotated to allow the dust-laden airflow to pass through the conventional filter cartridges and the fine filter cartridges in sequence. After a powder cake layer is formed on the outside of the conventional filter cartridges again, the valve is rotated to seal and block the air gap of the inner cylinder frame, thereby isolating the fine filter cartridges.

[0010] By using a fine filter cartridge to temporarily replace the powder cake layer for dust removal after dust cleaning, dust removal operations can be carried out stably.

[0011] Preferably, the inner cylinder frame is composed of a base plate and several circumferentially distributed arc-shaped plates. The base plate has several circumferentially arranged fan-shaped grooves, which are used to guide the dust on the outside of the fine filter cartridge into the dust hopper of the dust removal tower.

[0012] Preferably, the valve frame rotates to seal and block the ventilation gap between two adjacent arc-shaped plates, and several circumferentially distributed fan-shaped plates are fixedly installed on the lower side of the valve frame.

[0013] Preferably, when the valve frame seals and blocks the ventilation gap of the inner cylinder frame, the upper part of the sector groove is unobstructed; when the valve frame is rotated and does not seal and block the inner cylinder frame, the valve frame drives the sector plate to seal and block the corresponding sector groove.

[0014] Preferably, a number of circumferentially distributed plug rods are fixedly connected to the upper side of the valve frame, and a through hole is opened at the lower end of the air guide cylinder for the plug rods to pass through and connect; during dust removal, the plug rods are inserted into the through hole, so that the air guide cylinder and the valve frame rotate synchronously.

[0015] Preferably, a geared motor is fixedly installed on the upper side of the connecting cover, and the output shaft of the geared motor is fixedly connected to the air guide cylinder.

[0016] Preferably, the connecting cover is divided into upper and lower layers, and each layer of the connecting cover is provided with two air guide ports. The lower layer of the connecting cover is connected to the interior of a conventional filter cartridge.

[0017] Preferably, the air guide tube is rotatably and sealed to the middle of the connecting cover, and the upper layer of the connecting cover is connected to the inside of the air guide tube, so that the upper layer of the connecting cover is connected to the inside of the fine filter cartridge through the air guide tube.

[0018] Preferably, the valve assembly includes an electric valve fixedly installed on each air inlet, and two air inlets on the same layer of the connecting cover are responsible for air intake and air exhaust respectively.

[0019] Preferably, an annular cover is fixedly connected to the outside of the air guide cylinder. During dust removal, the annular cover is sealed and connected to the upper end of the inner cylinder frame.

[0020] The beneficial effects of the present invention are as follows: First, the present invention uses a fine filter cartridge to filter the airflow passing through the conventional filter cartridge again for a period of time after dust removal. This allows the fine filter cartridge to replace the powder cake layer outside the conventional filter cartridge, thereby enabling the fine filter cartridge to filter submicron dust. This prevents a large amount of fine dust from penetrating the filter cartridge before the powder cake layer is rebuilt after dust removal, thus preventing emission peaks and ensuring the stability of emission concentration.

[0021] Second, the present invention uses a valve assembly to simultaneously close the air outlet paths of the conventional filter cartridge and the fine filter cartridge during dust removal. The fine filter cartridge is protected by a valve frame, and the pulse airflow is allowed to fill the interior of the conventional filter cartridge for pulse dust removal. Finally, the air outlet path of the fine filter cartridge is opened, allowing the airflow to pass through the conventional filter cartridge and the fine filter cartridge in sequence, thereby allowing the fine filter cartridge to replace the powder cake layer for filtration.

[0022] Third, after the dust removal process is completed for a period of time, a powder cake layer for filtering submicron dust is re-established on the outside of the conventional filter cartridge. Then, the air outlet of the fine filter cartridge is closed through the valve assembly, so that the conventional filter cartridge and the powder cake layer on its outside can filter the dust in the airflow again. The fine filter cartridge is sealed and protected by the valve frame, and at the same time, the pulse airflow is filled into the interior of the fine filter cartridge to clean the dust.

[0023] Fourth, the present invention uses a rotating valve frame to open and close the protective fine filter cartridge. When the protective fine filter cartridge is sealed, the sector plate does not block the sector groove, allowing dust on the outside of the fine filter cartridge to pass through the sector groove and fall into the ash hopper. When the valve frame is opened and the fine filter cartridge participates in filtration, the sector plate blocks the sector groove to prevent dust in the ash hopper from being adsorbed on the fine filter cartridge. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a partial cross-sectional view of the present invention;

[0027] Figure 3 This is a schematic diagram of the conventional filter cartridge, connecting cover, geared motor and electric valve in this invention;

[0028] Figure 4 This is a schematic diagram of the separation structure of the conventional filter cartridge, the fine filter cartridge, the base plate, and the connecting cover in this invention;

[0029] Figure 5 This is a partial cross-sectional view of the connecting cover, conventional filter cartridge, fine filter cartridge and air inlet in this invention;

[0030] Figure 6 This is a partial cross-sectional view of the connecting cover, air guide tube, geared motor and fine filter cartridge in this invention;

[0031] Figure 7 This is a partial cross-sectional view of the air guide tube, annular retaining cover, and fine filter cartridge in this invention;

[0032] Figure 8 This is a partial structural diagram of the valve frame, arc plate, fine filter cartridge, and conventional filter cartridge in this invention;

[0033] Figure 9 This is a schematic diagram of the structure of the fine filter cartridge when the combination of the valve frame and the inner cylinder frame shields it.

[0034] Figure 10 This is a schematic diagram of the structure of the present invention when the combination of the valve frame and the inner cylinder frame no longer shields the fine filter cartridge;

[0035] Figure 11 This is a schematic diagram of the structure of the portal frame and the sector plate in this invention;

[0036] Figure 12 This is a partial cross-sectional view of the inner cylinder frame, annular cover, plug rod, and air guide tube in this invention.

[0037] In the diagram: 1. Dust collector tower; 2. Conventional filter cartridge; 3. Connecting assembly; 4. Fine filter cartridge; 5. Valve assembly; 31. Connecting cover; 32. Inner cylinder frame; 33. Air guide tube; 51. Electric valve; 311. Gear motor; 312. Air guide port; 321. Valve frame; 322. Base plate; 323. Arc plate; 324. Connecting rod; 325. Fan-shaped plate; 331. Annular retaining cover. Detailed Implementation

[0038] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0039] See Figure 1 , Figure 2 , Figure 3 and Figure 4 A baghouse dust collector includes a dust collection tower 1, in which a plurality of conventional filter cartridges 2 are arranged in an array. Inside the conventional filter cartridges 2, fine filter cartridges 4 for replacing the powder cake layer are arranged through a connecting assembly 3. The dust collector also includes a valve assembly 5 for controlling the air path.

[0040] In this embodiment, the dust removal tower 1 includes a tower body and an exhaust fan. The tower body has an air inlet that corresponds to the conventional filter cartridge 2. During dust removal, the valve assembly 5 connects the air outlets at the top of all conventional filter cartridges 2 with the upper space of the tower body and closes the air outlet at the top of the fine filter cartridge 4, so that the exhaust fan can only draw in the air inside all conventional filter cartridges 2, thereby allowing the conventional filter cartridges 2 to draw in the dust-laden airflow from the air inlet through negative pressure.

[0041] When the dust-laden airflow passes through the outside of the conventional filter cartridge 2 and enters its inside, the conventional filter cartridge 2 blocks the larger dust particles in the airflow and causes these dust particles to adhere to the outside of the conventional filter cartridge 2. Over time, the dust accumulated on the outside of the conventional filter cartridge 2 forms a dust cake layer. The dust cake layer itself has a fine porous structure, which allows the smaller fine dust particles to be intercepted by the dust cake layer.

[0042] As the filtration time increases, the powder cake layer thickens, and the air permeability resistance of the conventional filter cartridge 2 gradually increases. When the resistance of a certain conventional filter cartridge 2 reaches the set value, the outlet air passage of the conventional filter cartridge 2 is closed by the valve assembly 5, so that the conventional filter cartridge 2 stops participating in the suction of dust-laden airflow. Then, the pulse airflow is sprayed into the interior of the conventional filter cartridge 2 by the valve assembly 5, thereby cleaning the conventional filter cartridge 2 and restoring its air permeability.

[0043] However, after pulse jet cleaning, the powder cake layer on the outside of the conventional filter cartridge 2 is removed, which greatly reduces the filtration effect of the powder cake layer on submicron dust. At this time, the air outlet at the top of the conventional filter cartridge 2 is kept closed, and the air outlet at the top of the fine filter cartridge 4 inside the conventional filter cartridge 2 is opened. The exhaust fan draws air from inside the fine filter cartridge 4, allowing the dust-laden airflow to pass through the conventional filter cartridge 2 and the fine filter cartridge 4 in sequence. This allows the fine filter cartridge 4 to replace the original function of the powder cake layer in filtering submicron dust and ensure the emission concentration.

[0044] During the filtration process, larger dust particles accumulate again on the outside of the conventional filter cartridge 2, forming a dust cake layer. Then, the air outlet at the top of the fine filter cartridge 4 is closed, and the air outlet at the top of the conventional filter cartridge 2 is opened, switching to simultaneous dust removal of the conventional filter cartridge 2 and the dust cake layer on its outside. At the same time, pulse airflow is sprayed into the interior of the fine filter cartridge 4 through the valve assembly 5 to clean the fine filter cartridge 4, increasing the service life of the fine filter cartridge 4 and reducing the replacement frequency.

[0045] It should be noted that both the conventional filter cartridge 2 and the fine filter cartridge 4 are equipped with flow sensors, which are not shown in the figure. The flow sensors monitor the air permeability resistance of the conventional filter cartridge 2 and the fine filter cartridge 4 and send the monitoring data to the host computer in real time. This allows the host computer to control the switching of the fine filter cartridge 4 to participate in filtration, control the cleaning of the conventional filter cartridge 2, and indicate the replacement and maintenance of the fine filter cartridge 4 and the conventional filter cartridge 2.

[0046] It is worth noting that in this embodiment, the pore size of the fiber of the fine filter cartridge 4 has been repeatedly tested and selected by those skilled in the art, so that the filtration capacity and air permeability of the fine filter cartridge 4 are no different from those of the powder cake layer. As a result, the suction flow rate when the conventional filter cartridge 2 and the powder cake layer on the outside are used for dust removal at the same time is not much different from the suction flow rate when the conventional filter cartridge 2 and the fine filter cartridge 4 are used for dust removal at the same time.

[0047] See Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The connecting assembly 3 includes a connecting cover 31 that is detachably connected to the dust collector tower 1. An inner cylinder frame 32 corresponding to the connecting cover 31 is fixedly connected to the dust collector tower 1. A conventional filter cartridge 2 is covered on the coaxial outer side of the inner cylinder frame 32 and threadedly connected to the connecting cover 31. An air guide tube 33 is rotatably sealed inside the connecting cover 31. A fine filter cartridge 4 is inserted on the coaxial inner side of the inner cylinder frame 32 and threadedly connected to the air guide tube 33.

[0048] When placing the conventional filter cartridge 2 and the fine filter cartridge 4, simply tighten the fine filter cartridge 4 to the lower end of the air guide tube 33, and then tighten the conventional filter cartridge 2 to the lower end of the connecting cover 31 to complete the coaxial nesting arrangement of the fine filter cartridge 4 and the conventional filter cartridge 2. Then, from top to bottom, place the conventional filter cartridge 2 on the coaxial outer side of the inner cylinder frame 32, so that the fine filter cartridge 4 is also inserted on the coaxial inner side of the inner cylinder frame 32.

[0049] Then, the connecting cover 31 is fixedly connected to the dust collector 1 with screws, such as... Figure 3 and Figure 4As shown, this ensures that the lower parts of both the conventional filter cartridge 2 and the fine filter cartridge 4 are sealed and fitted to the inner cylinder frame 32, preventing dust-laden airflow from flowing directly from the bottom of the conventional filter cartridge 2 into its interior, and similarly preventing dust-laden airflow from flowing directly from the bottom of the fine filter cartridge 4 into its interior, thus ensuring the filtration capacity of both the conventional filter cartridge 2 and the fine filter cartridge 4.

[0050] The above-described method of installing conventional filter cartridge 2 and fine filter cartridge 4 involves connecting conventional filter cartridge 2 and fine filter cartridge 4 to the connecting cover 31 and the air guide tube 33 in advance. When replacing them, only the connecting cover 31 on the dust collector tower 1 needs to be replaced. This allows for efficient and convenient installation of conventional filter cartridge 2 and fine filter cartridge 4 inside the dust collector tower 1 for filtration.

[0051] To facilitate quick switching between the air path of the conventional filter cartridge 2 and the fine filter cartridge 4, the present invention designs the following structure: (See attached diagram) Figure 3 , Figure 5 and Figure 6 The connecting cover 31 is divided into upper and lower layers. Each layer of the connecting cover 31 is provided with two air guide ports 312. The lower layer of the connecting cover 31 is connected to the interior of the conventional filter cartridge 2.

[0052] See Figure 5 , Figure 6 and Figure 7 The air guide tube 33 is sealed and rotatably connected to the middle of the connecting cover 31. The upper layer of the connecting cover 31 is connected to the inside of the air guide tube 33, so that the upper layer of the connecting cover 31 is connected to the inside of the fine filter cartridge 4 through the air guide tube 33.

[0053] See Figure 2 , Figure 3 , Figure 4 and Figure 5 The valve assembly 5 includes an electric valve 51 fixedly installed on each air inlet 312, and two air inlets 312 on the same layer of the connecting cover 31 are responsible for air intake and air exhaust respectively.

[0054] In this embodiment, the electric valve 51 located at the front of the same layer is connected to the upper space of the dust removal tower 1, so that when the electric valve 51 is opened, the exhaust fan can draw air from the corresponding layer of the connecting cover 31 through the upper space of the dust removal tower 1, thereby achieving the suction of dust-laden airflow; the electric valve 51 located at the rear of the same layer is connected to the pulse jet generator (not shown in the figure). When the electric valve 51 is opened, the pulse jet generator can spray pulse gas at high speed into the corresponding layer of the connecting cover 31 to achieve the cleaning of conventional filter cartridge 2 or fine filter cartridge 4.

[0055] For example, when the conventional filter cartridge 2 and the powder cake layer on its outer side are used for dust removal at the same time, the electric valve 51 located at the front of the lower layer is opened and the other electric valves 51 are closed, so that the exhaust fan draws air from the conventional filter cartridge 2 through the lower layer of the connecting cover 31, so that the conventional filter cartridge 2 and the powder cake layer on its outer side can filter dust together.

[0056] When cleaning the conventional filter cartridge 2, the electric valve 51 located at the rear of the lower layer is opened, and the other electric valves 51 are closed, thereby pausing the filtration work of the conventional filter cartridge 2. Then, the pulse jet can blow pulse gas at high speed into the conventional filter cartridge 2, so that the powder cake layer on the outside of the conventional filter cartridge 2 is removed by the instantaneous back-blowing of high-pressure gas, and the dust falls into the ash hopper at the bottom of the dust collection tower 1.

[0057] After dust removal, the electric valve 51 located at the front of the upper layer is opened, while the other electric valves 51 are closed. This allows the exhaust fan to sequentially draw air from the fine filter cartridge 4 through the upper layer of the connecting cover 31 and the air guide tube 33. The fine filter cartridge 4 uses its internal negative pressure to draw air from the conventional filter cartridge 2, thereby allowing the dust-laden airflow to pass through the conventional filter cartridge 2 and the fine filter cartridge 4 in sequence. This achieves the effect of the fine filter cartridge 4 replacing the powder cake layer to filter submicron-level dust, ensuring the emission concentration after dust removal.

[0058] When a layer of powder cake accumulates on the outside of the conventional filter cartridge 2 again, the electric valve 51 located at the front of the lower layer is opened, so that the conventional filter cartridge 2 and the powder cake layer on its outside can filter dust together. At the same time, the electric valve 51 at the rear of the upper layer is opened, and the other electric valves 51 are closed. Then, the pulse jet can blow pulse gas at high speed into the fine filter cartridge 4 to clean the fine filter cartridge 4, increase the service life of the fine filter cartridge 4, reduce the frequency of downtime for replacement, and ensure dust removal efficiency.

[0059] To isolate the fine filter cartridge 4 from the conventional filter cartridge 2 during dust removal and prevent dust from the outside of the fine filter cartridge 4 from being discharged along the upper end of the conventional filter cartridge 2, the present invention designs the following structure: (See attached diagram) Figure 8 , Figure 9 , Figure 10 and Figure 11 The inner cylinder frame 32 is equipped with a rotatable valve 321. When the conventional filter cartridge 2 and the fine filter cartridge 4 are being cleaned, the valve 321 is rotated to close the air gap of the inner cylinder frame 32. This allows the valve 321 and the inner cylinder frame 32 to combine into a sealed cylindrical structure placed between the fine filter cartridge 4 and the conventional filter cartridge 2. This sealed cylindrical structure is used to isolate the fine filter cartridge 4 from the conventional filter cartridge 2.

[0060] On the one hand, when the conventional filter cartridge 2 is cleaned, it can ensure that all the airflow blown into the conventional filter cartridge 2 flows from the inside of the conventional filter cartridge 2 to the outside, achieving a back-blowing effect and preventing the airflow pressure from passing through the fine filter cartridge 4 and leaking; on the other hand, when the fine filter cartridge 4 is cleaned, it prevents the dust on the outside of the fine filter cartridge 4 from being discharged along the upper end of the conventional filter cartridge 2.

[0061] After the conventional filter cartridge 2 is cleaned, the valve frame 321 is rotated in the reverse direction, so that the valve frame 321 no longer seals and shields the fine filter cartridge 4. This allows the dust-laden airflow to pass through the conventional filter cartridge 2, the ventilation gap of the inner cylinder frame 32, and the fine filter cartridge 4 in sequence, realizing the filtration capacity of the fine filter cartridge 4 to replace the powder cake layer. After the powder cake layer forms again on the outside of the conventional filter cartridge 2, the valve frame 321 is rotated to seal and shield the ventilation gap of the inner cylinder frame 32, thereby isolating the fine filter cartridge 4 again.

[0062] To facilitate quick connection of the air guide cylinder 33 to the inner cylinder frame 32 and to the valve frame 321, the present invention designs the following structure: (See attached diagram) Figure 4 , Figure 5 , Figure 8 , Figure 10 and Figure 12 An annular cover 331 is fixedly connected to the outside of the air guide tube 33. During installation, the annular cover 331 covers the inner cylinder frame 32 from top to bottom, so that during dust removal, the annular cover 331 is sealed and connected to the upper end of the inner cylinder frame 32.

[0063] See Figure 8 and Figure 12 The upper side of the valve frame 321 is fixedly connected with several circumferentially distributed plug rods 324. The lower end of the air guide cylinder 33 is provided with a through hole for the plug rods 324 to pass through. During installation, when the air guide cylinder 33 moves from top to bottom, the plug rods 324 are inserted into the through hole, so that during dust removal, the lower end of the air guide cylinder 33 is sealed and fitted with the upper side of the valve frame 321, and the air guide cylinder 33 and the valve frame 321 rotate synchronously.

[0064] It should be noted that the upper end of the plug rod 324 and the lower side of the through hole are both chamfered to facilitate quick alignment and insertion of the plug rod 324 and the through hole.

[0065] With the above structure, when the valve 321 blocks the ventilation gap of the inner cylinder frame 32, the lower end of the valve 321 is sealed and attached to the inner cylinder frame 32, and the upper ends of the valve 321 and the inner cylinder frame 32 are sealed and attached to the air guide tube 33, thereby fully isolating the conventional filter cartridge 2 and the fine filter cartridge 4 and preventing the cross-contamination of dust on them.

[0066] To achieve a sealed and isolated fine filter cartridge 4, and to ensure that the dust can move to the ash hopper at the bottom of the dust collection tower 1 after the fine filter cartridge 4 is cleaned, the present invention designs the following structure: (See reference) Figure 4 , Figure 9 and Figure 10The inner cylinder frame 32 is composed of a base plate 322 and several circumferentially distributed arc-shaped plates 323. Several circumferentially arranged fan-shaped grooves are opened on the base plate 322. The fan-shaped grooves are used to guide the dust on the outside of the fine filter cartridge 4 into the ash hopper of the dust removal tower 1. The valve frame 321 rotates to seal and block the ventilation gap between two adjacent arc-shaped plates 323. Several circumferentially distributed fan-shaped plates 325 are fixedly installed on the lower side of the valve frame 321.

[0067] When the valve 321 rotates to seal and block the ventilation gap of the inner cylinder frame 32, the valve 321 drives the sector plate 325 to rotate synchronously, so that the upper part of the sector groove is unobstructed, and the dust on the fine filter cartridge 4 can fall into the ash hopper at the bottom of the dust collector tower 1 through the sector groove; when the valve 321 rotates and no longer seals and blocks the inner cylinder frame 32, the valve 321 drives the sector plate 325 to seal and block the corresponding sector groove, so that the bottom plate 322 is not connected to the ash hopper at the bottom of the dust collector tower 1, so that the suction airflow passes through the conventional filter cartridge 2, ensuring the suction flow rate.

[0068] To facilitate the rotation of the valve frame 321, the present invention designs the following structure: (See attached document) Figure 6 , Figure 7 and Figure 12 A geared motor 311 is fixedly installed on the upper side of the connecting cover 31. The output shaft of the geared motor 311 is fixedly connected to the air guide cylinder 33. The geared motor 311 drives the air guide cylinder 33 to rotate. The air guide cylinder 33 drives the valve frame 321 to rotate through the plug rod 324, thereby achieving the sealing and isolation of the fine filter cartridge 4.

[0069] In summary, on the one hand, the coaxial nesting installation of the conventional filter cartridge 2 and the fine filter cartridge 4 is achieved through the cooperative structure of the connecting cover 31, the air guide tube 33 and the inner cylinder frame 32. When replacing, only the connecting cover 31 needs to be replaced as a whole to complete the quick disassembly and assembly of the filter cartridge. The operation is simple and efficient, significantly reducing maintenance difficulty and downtime. On the other hand, the present invention is particularly suitable for special working conditions that are sensitive to emission concentration, such as industries with strict ultra-low emission requirements such as steel, power and chemical industries. By using the fine filter cartridge 4 to temporarily replace the powder cake layer for fine filtration after dust removal, the emission peak at the moment of dust removal is effectively eliminated, ensuring that the outlet dust concentration is stably up to standard.

[0070] Meanwhile, since the number of conventional filter cartridges 2 arranged in the same dust removal tower 1 is limited, and the fine filter cartridge 4 only participates in filtration briefly after dust removal, there is no need to carry out large-scale modification of the existing dust removal system or invest excessive costs, which has good economic benefits. In addition, the dust removal operation is an intermittent operation, and the fine filter cartridge 4 is only used when necessary. With the switching control of valve assembly 5 and valve 321, the fine filter cartridge 4 can be cleaned independently in a timely manner, avoiding dust accumulation and blockage due to long-term operation. Thus, the technical effect of the present invention is that it can continuously and stably remove dust without stopping maintenance during long-term operation, which has broad prospects for promotion and application.

[0071] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0072] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0073] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0074] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A baghouse dust collector, comprising a dust collection tower, wherein a plurality of conventional filter cartridges arranged in an array are disposed within the dust collection tower, characterized in that, The conventional filter cartridge contains a fine filter cartridge that replaces the powder cake layer, and the dust collector also includes a valve assembly for controlling the air path. The connecting assembly includes a connecting cover that is detachably connected to the dust collector tower. The connecting cover is divided into upper and lower layers. Each layer of the connecting cover is provided with two air ducts. The lower layer of the connecting cover communicates with the interior of a conventional filter cartridge. The dust collector tower is fixedly connected with an inner cylinder frame that corresponds one-to-one with the connecting cover. The conventional filter cartridge cover is located on the coaxial outer side of the inner cylinder frame and is threadedly connected to the connecting cover. The connecting cover is sealed and rotatably equipped with an air guide tube. The fine filter cartridge is inserted on the coaxial inner side of the inner cylinder frame and is threadedly connected to the air guide tube. An annular cover is fixedly connected to the outside of the air guide cylinder. During dust removal, the annular cover is sealed and connected to the upper end of the inner cylinder frame. The air guide tube is sealed and rotatably connected to the middle of the connecting cover, and the upper layer of the connecting cover is connected to the inside of the air guide tube, so that the upper layer of the connecting cover is connected to the inside of the fine filter cartridge through the air guide tube. The valve assembly includes an electric valve fixedly installed on each air inlet, and two air inlets on the same layer of the connecting cover are responsible for air intake and air exhaust respectively. The inner cylinder frame consists of a base plate and several circumferentially distributed arc-shaped plates. The base plate has several circumferentially arranged fan-shaped grooves, which are used to guide the dust on the outside of the fine filter cartridge into the dust hopper of the dust removal tower. The inner cylinder frame is rotatably sealed with a valve frame. The valve frame rotates to seal and block the ventilation gap between two adjacent arc-shaped plates. Several circumferentially distributed fan-shaped plates are fixedly installed on the lower side of the valve frame. When the valve frame seals and blocks the ventilation gap of the inner cylinder frame, the upper part of the sector groove is unblocked; when the valve frame is rotated and does not seal and block the inner cylinder frame, the valve frame drives the sector plate to seal and block the corresponding sector groove. The upper side of the valve frame is fixedly connected with several circumferentially distributed plug rods, and the lower end of the air guide cylinder is provided with a through hole for the plug rods to pass through and connect; during dust removal, the plug rods are inserted into the through hole, so that the air guide cylinder and the valve frame rotate synchronously. After cleaning the conventional filter cartridges, the valve frame is rotated to allow the dust-laden airflow to pass through the conventional filter cartridges and the fine filter cartridges in sequence. After a dust cake layer forms again on the outside of the conventional filter cartridges, the valve frame is rotated to seal and block the air gap of the inner cylinder frame, thereby isolating the fine filter cartridges. The fine filter cartridges are used to temporarily replace the dust cake layer for dust removal after cleaning, thus ensuring stable dust removal operations.

2. The bag filter dust collector according to claim 1, characterized in that, A geared motor is fixedly installed on the upper side of the connecting cover, and the output shaft of the geared motor is fixedly connected to the air guide cylinder.

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