Filter assembly and dust removal device

Abstract

The invention provides a filter assembly and a dust removal device, and relates to the technical field of dust removal equipment, and the filter assembly comprises at least one filter skeleton, a positioning piece and a filter membrane. The filtering framework is of a hollow structure, the filtering hole area is located between the first connecting area and the second connecting area, the first connecting area of the filtering framework is sleeved with the positioning piece, the positioning piece is connected with the outer side wall of the first connecting area, the filtering membrane is arranged on the outer side wall of the filtering framework, and the filtering membrane comprises a fixing part and an extending part; the fixing part is fixedly connected with the second connecting area of the filtering framework, the extending part is attached to the filtering hole area and the first connecting area, and the two opposite faces of part of the extending part abut against the positioning piece and the first connecting area respectively. The positioning piece can position and fix the extension part of the filter membrane, and the extension part does not need to be welded on the filter framework, so that the joint of the filter membrane is prevented from being broken, perforated and fractured or the filter membrane is prevented from being loosened, the filtering effect of the high-temperature filter bag is ensured, and the service life of the high-temperature filter bag is prolonged.

Description

Technical Field

[0001] This invention relates to the field of dust removal equipment technology, and more specifically, to a filter component and a dust removal device. Background Technology

[0002] Filter bag structures intercept dust through surface filtration. When dust-laden gas passes through the filter bag, particles are trapped on the surface, forming a dust layer, while clean gas is discharged through the pores of the filter bag. In one filter bag structure, the filter membrane is welded to a perforated metal frame. In high-temperature dust removal applications, pulse-jet cleaning is used to remove the dust layer, keeping the dust collector in a low-resistance state. During pulse-jet cleaning, the low-temperature pulse airflow and the high-temperature filter bag structure create a temperature difference. Due to the material difference between the filter membrane and the perforated metal frame, the welded joints experience significant temperature changes, which can easily lead to loosening or detachment of the filter membrane, affecting the normal operation of the dust collector. Summary of the Invention

[0003] The purpose of this invention is to provide a filter assembly and a dust removal device to avoid the problems caused by welding the extension part to the filter frame in traditional filter assemblies, such as weld cracks, perforations, breaks, or loosening of the filter membrane, thereby improving the product life of the filter assembly.

[0004] A first aspect of the present invention provides a filtering assembly comprising: At least one filter frame, the filter frame being a hollow structure, the filter frame including a first connecting area, a filter hole area and a second connecting area, the filter hole area being located between the first connecting area and the second connecting area; when the filter assembly is backwashed using a backwashing medium, the backwashing medium sequentially reaches the first connecting area, the filter hole area and the second connecting area. A positioning element is sleeved on the first connection area of ​​the filter frame, and the positioning element is connected to the outer wall of the first connection area. A filter membrane is disposed on the outer wall of the filter frame. The filter membrane includes a fixed part and an extension part. The fixed part is fixedly connected to the second connection area of ​​the filter frame. The extension part is attached to the filter pore area and the first connection area. The opposite sides of a portion of the extension part abut against the positioning member and the first connection area, respectively.

[0005] In one possible embodiment of the present invention, the positioning member includes a first annular housing and a first isolation portion. The end of the first annular housing away from the extension portion is fixedly connected to the filter frame. The first annular housing and the outer side wall of the first connection area define a first receiving space, and the first isolation portion fills the first receiving space.

[0006] In one possible embodiment of the present invention, the first annular housing is provided with a first connecting portion and a second connecting portion, the first connecting portion being welded to the outer side wall of the first connecting area of ​​the filter frame, and the second connecting portion defining the first receiving space with the outer side wall of the first connecting area of ​​the filter frame.

[0007] In one possible embodiment of the present invention, the outer diameter of the second connecting portion gradually increases along a first direction from the first connecting portion to the second connecting portion, and the second connecting portion is bent relative to the first connecting portion toward the side of the first annular housing away from the filter frame to form the first receiving space.

[0008] In one possible embodiment of the present invention, a plurality of limiting teeth are provided at the end of the second connecting portion away from the first connecting portion, the plurality of limiting teeth being arranged at intervals around the filter frame, and the plurality of limiting teeth being used to limit the first isolation portion.

[0009] In one possible embodiment of the present invention, a limiting edge is provided at the end of the second connecting portion away from the first connecting portion. The limiting edge surrounds the filter frame and has an annular structure. The limiting edge is used to limit the first isolation portion and seal the first accommodating space.

[0010] In one possible embodiment of the present invention, the first connecting part and the filter frame are made of the same or similar metal material.

[0011] In one possible embodiment of the present invention, the thickness of the first connecting portion is D1, and the thickness of the filter membrane is D2, satisfying: D1≥3D2.

[0012] In one possible embodiment of the invention, an annular isolation member is further included, the isolation member being connected to the inner sidewall of the filter frame, the isolation member and the extension portion being located on opposite sides of the first connection area, the isolation member including a second annular shell and a second isolation portion, the second annular shell being connected to the inner sidewall of the filter frame and defining a second receiving space, the second isolation portion being disposed within the second receiving space.

[0013] In one possible embodiment of the present invention, the number of filter frames is multiple, and the multiple filter frames are arranged parallel to each other and spaced apart.

[0014] A second aspect of the present invention provides a dust removal device, including a backwash member and a filter assembly as described in any of the above embodiments. The backwash member is disposed at one end near the first connection area of ​​the filter frame, and the backwash member is provided with a backwash medium channel, through which the backwash medium flows into the filter assembly.

[0015] Compared to existing technologies, the filter assembly and dust removal device provided by this invention introduce a positioning element. This element secures the first connecting area of ​​the filter membrane to the filter frame by pressing against it, replacing the traditional method of welding the filter membrane sheet to the opposite ends of the filter frame. This eliminates the problems of weld cracking, perforation, or breakage caused by the large temperature difference between the welded ends and the pulse jet cleaning medium during dust removal, as well as the loosening caused by repeated axial stretching of the filter membrane. This ensures the dust removal effect of the filter assembly and extends its product lifespan. Furthermore, the filter assembly of this invention is easy to process and maintain, significantly reducing the procurement and maintenance costs of the filter assembly and dust collector.

[0016] The advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of a filtering component provided in some embodiments of the present invention; Figure 2 This is a schematic diagram of the filter frame structure of the filter assembly provided in some embodiments of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of a partial structure of the filter frame of a filter assembly provided in some embodiments of the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the filter frame structure of the filter assembly provided in some embodiments of the present invention. Figure 2 ; Figure 5 This is a schematic diagram of a partial structure of the filter frame of a filter assembly provided in some embodiments of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the structure of the first annular housing of the filter assembly provided in some embodiments of the present invention; Figure 7 This is a physical image of the filter membrane of a filter assembly provided in some embodiments of the present invention facing the filter frame. Figure 8 This is a physical image of the filter membrane of a filter assembly provided in some embodiments of the present invention, showing the side facing away from the filter frame.

[0019] Explanation of key component symbols; 100 - Filter assembly; 110 - Filter frame; 111 - Filter pore area; 112 - First connection area; 113 - Second connection area; 120 - Backflush member; 130 - Positioning member; 131 - First annular housing; 1311 - First connection part; 1312 - Second connection part; 1313 - Limiting tooth; 132 - First isolation part; 140 - Filter membrane; 141 - Fixing part; 142 - Extension part; 150 - Isolation member; 151 - Second annular housing; 152 - Second isolation part; 160 - Backflush channel; X - First direction. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply 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 tilted.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0027] Please refer to Figure 1 and Figure 2 As shown, an embodiment of this application provides a filter assembly 100, which includes at least one filter frame 110, a positioning member 130, and a filter membrane 140.

[0028] Specifically, in combination Figure 2 and Figure 3 As shown, the hollow filter frame 110 includes a first connecting area 112, a filter hole area 111, and a second connecting area 113. The filter hole area 111 is located between the first connecting area 112 and the second connecting area 113. When the filter assembly 100 is backwashed using a backwashing medium, the backwashing medium enters the filter frame 110 and sequentially reaches the first connecting area 112, the filter hole area 111, and the second connecting area 113.

[0029] The filter frame 110 has multiple through holes in its filter pore area 111. The positioning member 130 is sleeved on the first connection area 112 of the filter frame 110 and is connected to the outer side wall of the first connection area 112 of the filter frame 110. The filter membrane 140 is disposed on the outer side wall of the filter frame 110. The filter membrane 140 filters and intercepts dust and accumulates it at the through hole position. By blowing backflow into the filter assembly 100, the dust can be peeled off and blown off, thus cleaning the filter assembly 100. During the operation of the filter assembly 100, the filtration and dust removal-backflow cleaning processes are carried out alternately. The positioning member 130 plays a role in positioning and fixing the extension 142 of the filter membrane 140, so that the extension 142 does not need to be welded to the filter frame 110.

[0030] In this embodiment, the filter membrane 140 is disposed on the outer side wall of the filter frame 110. The filter membrane 140 includes a fixing part 141 and an extension part 142. The fixing part 141 is fixedly connected to the second connecting area 113 of the filter frame 110. The extension part 142 is attached to the filter pore area 111 and the first connecting area 112. Parts of the opposite sides of the extension part 142 abut against the positioning member 130 and the first connecting area 112, respectively. In this way, the filter membrane 140 is attached to the filter frame 110 and forms a circumferential wrap around the filter frame 110. The filter membrane 140 and the filter pore area 111 of the filter frame 110 cooperate to filter and intercept dust. The fixing part 141 and the extension part 142 on the filter membrane 140 are fixedly connected and pressed together to achieve dust filtration. The filter membrane 140 is differentially fixed to the filter frame 110 by force contact. The extension 142 is relatively firmly fixed to the filter frame 110 by the positioning member 130. When the filter assembly 100 is cleaned by back-jet cleaning with low-temperature back-jet medium, even if there is a large temperature difference between the back-jet medium and the flue gas filtration operation temperature, the filter membrane 140 can freely extend or retract during the deformation caused by temperature change because the extension 142 of the filter membrane 140 is radially contacted with the filter frame 110 and the positioning member 130 in the first connection area 112 of the filter frame 110. This eliminates the risk of poor sealing caused by weld failure due to welding fixation and the risk of the filter membrane 140 tearing or falling off from the end due to repeated pulling caused by fixing at both ends. In addition, the distance between the back-jet medium and the second connection area 113 is relatively far. When the back-jet medium reaches the second connection area 113, the temperature difference between it and the fixing part 141 of the filter membrane 140 is small and will not have a significant impact on the welding fixation of the fixing part 141.

[0031] In this invention, the first connecting area 112 of the filter membrane 140 is fixed to the filter frame 110 by pressing with the positioning member 130, which replaces the traditional method of welding the filter membrane sheet to the opposite ends of the filter frame 110. This eliminates the problem of weld cracking, perforation or breakage caused by the pulse jet of the backflushing medium with a large temperature difference during dust removal operation, as well as the problem of loosening caused by repeated pulling of the filter membrane in the axial direction during the traditional two-end welding method. In addition, the filter assembly 100 of this invention is easy to process and maintain, which greatly reduces the purchase and maintenance costs of the filter assembly 100 and the dust collector.

[0032] The filter assembly 100 and dust removal device provided by this invention, by introducing a positioning member 130, fixes the first connecting area 112 of the filter membrane 140 to the filter frame 110 by pressing, replacing the traditional method of welding the filter membrane sheet to the opposite ends of the filter frame 110. This fundamentally eliminates the weld cracking, perforation, or breakage failure caused by the pulse jet of the backflushing medium with a large temperature difference during dust removal operation, as well as the loosening problem caused by repeated axial pulling of the filter membrane, thus ensuring the dust removal effect of the filter assembly 100 and extending its product life. In addition, the filter assembly 100 of this invention is easy to process and maintain, greatly reducing the procurement and maintenance costs of the filter assembly 100 and the dust collector.

[0033] refer to Figure 1 and Figure 2 As shown, the filter assembly 100 has a first direction X. For example, the first direction X is defined as the height direction of the filter assembly 100. It is understood that the above definitions are only for ease of understanding the relative positional relationships of the parts in the filter assembly 100 and should not be construed as limitations on this application.

[0034] like Figure 2 As shown, the positioning member 130 is sleeved on the outer periphery of the first connection area 112 of the filter frame 110, and the extension 142 of the filter membrane 140 is pressed against the outer periphery of the first connection area 112 of the filter frame 110 by the positioning member 130.

[0035] In this embodiment, the filter assembly 100 is a high-temperature metal filter bag, and its filter frame 110 is made of metal material to ensure that the filter frame 110 has sufficient structural strength and high temperature resistance, wear resistance and corrosion resistance. The filter membrane 140 is a metal filter membrane, and the backwash medium is gas.

[0036] The inventors discovered through in-depth research that when the filter assembly 100 operates in a high-temperature flue gas environment, the operating temperature is 300℃ to 600℃, while the temperature of the backflow airflow is only 200℃ at most (in some cases, even room temperature gas). The backflow airflow sequentially passes through the areas containing the first connecting area 112, the filter pore area 111, and the second connecting area 113 of the filter frame 110. Due to the large temperature difference between the backflow airflow and the operating temperature, especially in the first connecting area 112 where the airflow first passes, the temperature change is the greatest (the temperature difference gradually decreases as the airflow path lengthens) and the air pressure is the highest (the airflow is discharged through the axially distributed filter pore area 111, and the airflow becomes more dispersed and the pressure decreases as it goes further). Currently, the filter membrane 140 is usually fixed to the filter frame 110 by welding at both ends. Figure 7 and Figure 8 As shown, for example, the most widely used resistance welding connection currently utilizes the high temperature generated by the current passing through the contact resistance to instantly (a few milliseconds to tens of milliseconds) melt the metal locally to form a weld nugget. After cooling, a series of interconnected weld points are formed. Due to the significant thickness difference between the filter membrane 140 and the filter frame 110, only a thin weld seam can be formed during welding. Furthermore, the filter membrane 140 and the filter frame 110 have different coefficients of thermal expansion due to their different materials. The filtration dust removal and backflushing cleaning processes interspersed during the operation of the filter assembly 100 cause the weld seam at the connection to be subjected to constant hot and cold temperatures. The alternating temperature environment, subjected to repeated and enormous shear and tensile stresses, coupled with the repeated back-and-forth stretching of the filter membrane 140 along the axial direction of the filter frame 110 due to alternating cooling (contraction) and heating (expansion), under the action of repeated stress (such as thermal stress and dust removal impact), the edge of each weld point becomes a potential stress concentration point, and microcracks may initiate and expand under the action of thermal fatigue, eventually leading to weld point cracking. In mild cases, this can cause connection failure at the joint, affecting the filtration effect, and in severe cases, it can cause the entire end of the filter membrane 140 to fall off.

[0037] This application abandons the traditional path of fixing by welding at both ends. Instead, it retains the traditional fixing method at the end away from the backflow outlet, while the end closer to the backflow outlet (the area with the greatest temperature difference and airflow) uses the positioning element 130 to press against the filter membrane 140 and tightly fix it to the filter frame 110. This fundamentally eliminates the risk of failure of fragile welds caused by welding materials with different properties in areas with large temperature differences and high pressure in complex working environments. It also eliminates the risk of loosening and failure caused by repeated pulling of the filter membrane 140 in a confined space due to fixing at both ends. In areas with small temperature differences, the traditional fixing method is retained, which can achieve large-scale, high-efficiency, and automated implementation. This approach ensures both work efficiency and the stability and tightness of the connection between the filter membrane 140 and the filter frame 110.

[0038] One end of the first annular shell 131 is circumferentially welded to the outer wall of the filter cylinder along the first direction X, or the first annular shell 131 is sleeved on the filter cylinder.

[0039] For example, the filter cartridge is a cylindrical structure that serves as the core skeleton to support the filter membrane 140, allowing backflushing airflow to pass through the inside of the cartridge. The filter membrane 140 surrounds the outer side of the filter skeleton 110 and is used to seal the filter pore area 111 on the filter skeleton 110, capturing dust during filtration and removing dust during backflushing.

[0040] In one embodiment, alternatively, referencing Figure 2 and Figure 3 As shown, the positioning member 130 includes a first annular shell 131 and a first isolation portion 132. The end of the first annular shell 131 away from the extension portion 142 is fixedly connected to the filter frame 110. The first annular shell 131 and the outer side wall of the first connection area 112 of the filter frame 110 define a first receiving space. The first isolation portion 132 fills the first receiving space. The first annular shell 131 is fixedly connected to the filter frame 110 to facilitate the installation and fixation of the position of the first annular shell 131. The extension portion 142 is placed in the first receiving space. Since the extension portion 142 of the filter membrane 140 is not welded to the filter frame 110, the first isolation portion 132 can fill the first receiving space to facilitate the contact and compression of the extension portion 142 of the filter membrane 140, avoiding gaps, detachment, or wrinkles in the filter membrane 140, ensuring the tight connection between the filter membrane 140 and the filter frame 110, replacing the traditional welding method.

[0041] Optionally, such as Figure 2 As shown, the fixing part 141 is welded to the outer wall of the filter frame 110. The fixing part 141 is firmly fixed to the filter frame 110 in the second connection area 113 by welding or other means to prevent the filter membrane 140 and the filter frame 110 from having connection gaps, ensuring the stability of the connection and the filtration sealing, thereby ensuring the filtration effect. The extension part 142 abuts between the first isolation part 132 and the first connection area 112 of the filter frame 110.

[0042] For example, the material of the first isolation part 132 can be non-metallic materials such as asbestos rope or ceramic fiber. The first isolation part 132 is used to prevent unfiltered gas from entering the filter bag. In addition, it will not cause deformation or compression to the first annular shell 131 when there is a temperature difference. The material of the first isolation part 132 can also be high-temperature resistant sealant or flexible gasket.

[0043] In one embodiment, reference Figure 3 and Figure 6As shown, the first annular housing 131 has a first connecting portion 1311 and a second connecting portion 1312 at one end near the recoil member 120. The first connecting portion 1311 is welded to the outer wall of the filter frame 110, and the second connecting portion 1312 defines a first receiving space with the outer wall of the filter frame 110. The first connecting portion 1311 and the second connecting portion 1312 are connected to each other. The outer diameter of the second connecting portion 1312 gradually increases along the first direction X from the first connecting portion 1311 to the second connecting portion 1312, and the cross-sectional area gradually expands along the first direction X. The first connecting portion 1311 is used for positioning welding with the outer wall of the filter frame 110, and the second connecting portion 1312 forms the first receiving space with the outer wall of the filter frame 110.

[0044] For example, the second connecting portion 1312 and the first connecting portion 1311 form a conical structure and a stepped structure. The second connecting portion 1312 is an annular boss. The second connecting portion 1312 is bent relative to the first connecting portion 1311 toward the side of the first annular housing 131 away from the filter frame 110 to form a filling space, so that the outer wall of the filter frame 110 of the second connecting portion 1312 forms a first receiving space.

[0045] Optionally, the thickness of the first connecting portion 1311 is D1, and the thickness of the filter membrane 140 is D2≤1mm. The relationship between D1 and D2 satisfies D1≥3D2, meaning the thickness D1 of the first connecting portion 1311 is greater than or equal to the thickness 3D2 of the filter membrane 140. This ensures sufficient thickness D1 for the first connecting portion 1311 to guarantee weld stability and improve the welding effect. A thin metal layer in the metal filter membrane is one reason why the welding position / weld is susceptible to failure due to varying temperature conditions during welding. To address this, controlling the thickness of the first connecting portion 1311 in the positioning member 130 further ensures the stability of the welding position in the improved solution, preventing the positioning member 130 from becoming loose due to welding.

[0046] Furthermore, 7D2≥D1≥3D2, meaning that the thickness D1 of the first connecting part 1311 is greater than or equal to the thickness 3D2 of the filter membrane 140, and the thickness D1 of the first connecting part 1311 is less than or equal to the thickness 7D2 of the filter membrane 140. The thickness D1 of the first connecting part 1311 being greater than or equal to the thickness 3D2 of the filter membrane 140 ensures that the thickness D1 of the first connecting part 1311 has sufficient thickness to ensure welding stability, and on the other hand, makes the thickness D1 of the first connecting part 1311 less than or equal to the thickness 7D2 of the filter membrane 140 to reduce the weight of the first connecting part 1311 and avoid the situation where the welding position is loose due to excessive weight.

[0047] Of course, this limitation does not constitute a necessary condition for implementing the technical solution of the present invention, but only an optimization solution. Even if the first connecting part 1311 and the filter membrane 140 do not meet the above-mentioned thickness relationship, under the same thickness welding conditions, the impact of the failure of the weld of the first connecting part 1311 of the positioning member 130 on the filter assembly 100 is still far less than the impact of the failure of the weld of the filter membrane 140 on the filter assembly 100. That is, the setting of the positioning member 130 can still solve the defects of the traditional two-end welding fixation to a certain extent.

[0048] Optionally, the first connecting part 1311 and the filter frame 110 are made of the same or similar metal material. Since the filter membrane 140 is usually a commercially available, standardized product, while the positioning part 130 is a non-standard part added by the applicant of this invention to address the aforementioned problems, the selection of materials is more flexible compared to the filter membrane 140. Therefore, the positioning part 130, especially the first connecting part 1311, is preferably made of the same or similar metal material as the filter frame 110. This not only improves the stability of the weld but also avoids weld detachment caused by differences in the coefficients of thermal expansion of the materials, and avoids or reduces defects such as weld cracking and failure caused by thermal fatigue.

[0049] In one embodiment, reference Figure 6 As shown, the second connecting part 1312 is provided with a plurality of limiting teeth 1313 at the end away from the first connecting part 1311. The plurality of limiting teeth 1313 are arranged at intervals around the filter frame 110. The plurality of limiting teeth 1313 are used to limit the first isolation part 132. The plurality of limiting teeth 1313 together play an axial limiting role on the first isolation part 132, reducing the possibility of the first isolation part 132 falling off or dropping.

[0050] For example, the limiting tooth 1313 can be arc-shaped. The arc-shaped limiting tooth 1313 can limit the first isolation part 132 on the one hand, and avoid damage to the filter membrane 140 on the other hand, thus ensuring the effectiveness of the filter membrane 140.

[0051] Optionally, in one embodiment, a limiting edge is provided at the end of the second connecting portion 1312 away from the first connecting portion 1311. The limiting tooth 1313 in the above embodiment is replaced by the limiting edge, which is an annular structure. The limiting edge surrounds the filter frame 110 and is used to limit the first isolation portion 132 and seal the first receiving space. On the one hand, the limiting edge can limit the first isolation portion 132; on the other hand, the limiting edge forms a continuous closed annular blocking surface. The limiting edge can at least abut against the extension portion 142 of the filter membrane 140. For example, the limiting edge contacts the extension portion 142 of the filter membrane 140 to form a lip-shaped sealing structure.

[0052] To further enhance and counteract the impact of the backflow on the filter membrane 140, in one embodiment, the filter assembly 100 may optionally include an annular isolation member 150, which is connected to the inner wall of the filter frame 110. For example, the isolation member 150 may be positioned corresponding to the position of the positioning member 130.

[0053] In one embodiment, alternatively, referencing Figure 4 and Figure 5 As shown, the isolation member 150 includes a second annular shell 151 and a second isolation part 152. The second annular shell 151 is connected to the inner sidewall of the filter frame 110 and defines a second receiving space. The second isolation part 152 is disposed in the second receiving space and abuts against the inner sidewall of the filter frame 110. Backflow air is blown into the filter frame 110 to peel off and blow away dust. During the backflow air spraying into the filter frame 110, the isolation member 150 isolates and blocks the end position of the filter membrane 140 and the positioning member 130, preventing the backflow air from directly spraying towards the filter membrane 140 and the positioning member 130, reducing the possibility of the positioning member 130's weld joint falling off or loosening, improving the connection tightness of the filter membrane 140, and thus improving the product life of the filter assembly 100.

[0054] For example, the isolator 150 and the positioning member 130 are respectively located on opposite sides of the sidewall of the first connection area 112 of the filter frame 110. The isolator 150 and the positioning member 130 work together to provide better protection and isolation, preventing the filter membrane 140 and the positioning member 130 from becoming loose and affecting the filtration effect, thus improving the performance of the filter assembly 100. In addition, it will not affect the normal operation of the filter assembly 100.

[0055] refer to Figure 1 As shown, the isolation member 150 is housed within the filter frame 110. The isolation member 150 is located in the first connection area 112 of the filter frame 110. When the backflow blows into the filter frame 110 to remove dust, the isolation member 150 can play a certain role in isolating and blocking the connection position between the first connection portion 1311 of the positioning member 130 and the filter frame 110, thereby improving the installation firmness of the first connection portion 1311 of the positioning member 130.

[0056] The isolator 150 has a ring structure. The isolator 150 and the filter membrane 140 are located on opposite sides of the side wall of the filter frame 110, so that the isolator 150 is arranged circumferentially around the inner side wall of the filter frame 110. The isolator 150 plays a physical isolation role for the inner side wall of the filter frame 110, and the backflow airflow can pass smoothly through the isolator 150.

[0057] Optionally, the isolation member 150 is disposed corresponding to the first connecting portion 1311 of the positioning member 130, and the isolation member 150 is located above the filter pore area 111 of the filter frame 110. The isolation member 150 can at least protect and isolate the filter membrane 140 and the first connecting portion 1311 with the positioning member 130, reducing the shrinkage or wrinkling of the filter membrane 140 due to temperature difference changes. The isolation member 150 is located above the filter pore area 111 to avoid the isolation member 150 from hindering and affecting the normal filtration performance of the filter membrane 140.

[0058] Furthermore, the heights of the upper and lower ends of the isolator 150 along the height direction are H1 and H2, respectively. The bottom position height of the first connecting portion 1311 of the positioning member 130 along the height direction is H3. The portion of the extension 142 of the filter membrane 140 that abuts against the positioning member 130 and the first connecting area 112 is H4, satisfying: H2≤H3

[0059] For example, in combination Figure 2 and Figure 3 ​As shown, the isolation member 150 includes a second annular shell 151 and a second isolation portion 152. The second annular shell 151 is connected to the inner wall of the filter frame 110 and defines a second receiving space. The second isolation portion 152 is disposed within the second receiving space and abuts against the inner wall of the filter frame 110. For example, the second annular shell 151 is made of metal to facilitate welding it to the inner wall of the filter frame 110. The second isolation portion 152 is made of a thermal insulation material, such as aluminum silicate or ceramic fiber, to achieve better thermal insulation.

[0060] The filter frame 110 is a filter cylinder, and the cylinder wall of the filter cylinder has multiple through holes. The multiple through holes are arranged in an array and are correspondingly set in the through hole area. The multiple through holes arranged in an array have better dust capture and adsorption effects.

[0061] One end of the extension 142 of the first annular housing 131 away from the filter membrane 140 along the first direction X is circumferentially welded to the outer wall of the filter cylinder, or the first annular housing 131 is sleeved on the filter cylinder and one end of the extension 142 of the first annular housing 131 away from the filter membrane 140 along the first direction X is interference-fitted to the filter cylinder, so as to securely install the first annular housing 131 on the filter cylinder and realize the limiting and fixing of one end of the extension 142 of the filter membrane 140.

[0062] Optionally, there are multiple filter frames 110, which are parallel to each other and spaced apart. The multiple filter frames 110 are spaced apart along the first direction X. The multiple filter frames 110 are kept parallel to each other, and there is no interference or obstruction between adjacent filter frames 110. The multiple filter frames 110 work together in the dust removal space to achieve a better filtration and dust removal effect on high-temperature smoke and dust.

[0063] Embodiments of the present invention also provide a dust removal device, including a backwash member 120 and a filter assembly 100 as described in any of the above embodiments. The backwash member 120 is disposed at one end near the first connection area 112 of the filter frame 110. The backwash member 120 is provided with a backwash medium channel, and the backwash medium flows into the filter assembly 100 through the backwash medium channel. The dust removal device including the filter assembly 100 has all the beneficial effects of the filter assembly 100, which will not be described in detail here.

[0064] The backflush member 120 is provided with a backflush channel 160, and each of the filter frames 110 is in gas communication with the backflush channel 160. Multiple filter frames 110 are arranged at intervals along the direction of the backflush channel 160.

[0065] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0066] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A filter assembly, characterized in that, include: At least one filter frame, the filter frame being a hollow structure, the filter frame including a first connecting area, a filter hole area and a second connecting area, the filter hole area being located between the first connecting area and the second connecting area; when the filter assembly is backwashed using a backwashing medium, the backwashing medium sequentially reaches the first connecting area, the filter hole area and the second connecting area. A positioning element is sleeved on the first connection area of ​​the filter frame, and the positioning element is connected to the outer wall of the first connection area. A filter membrane is disposed on the outer wall of the filter frame. The filter membrane includes a fixed part and an extension part. The fixed part is fixedly connected to the second connection area of ​​the filter frame. The extension part is attached to the filter pore area and the first connection area. The opposite sides of a portion of the extension part abut against the positioning member and the first connection area, respectively.

2. The filter assembly according to claim 1, characterized in that, The positioning member includes a first annular shell and a first isolation portion. The end of the first annular shell away from the extension portion is fixedly connected to the filter frame. The first annular shell and the outer wall of the first connection area define a first receiving space, and the first isolation portion fills the first receiving space.

3. The filter assembly according to claim 2, characterized in that, The first annular housing is provided with a first connecting part and a second connecting part. The first connecting part is welded to the outer wall of the first connecting area of ​​the filter frame, and the second connecting part and the outer wall of the first connecting area of ​​the filter frame define the first receiving space.

4. The filter assembly according to claim 3, characterized in that, Along the first direction from the first connecting portion to the second connecting portion, the outer diameter of the second connecting portion gradually increases, and the second connecting portion is bent relative to the first connecting portion toward the side of the first annular housing away from the filter frame to form the first receiving space.

5. The filter assembly according to claim 3, characterized in that, The second connecting part is provided with a plurality of limiting teeth at the end away from the first connecting part. The plurality of limiting teeth are arranged at intervals around the filter frame and are used to limit the first isolation part.

6. The filter assembly according to claim 3, characterized in that, The second connecting portion has a limiting edge at one end away from the first connecting portion. The limiting edge surrounds the filter frame and has an annular structure. The limiting edge is used to limit the first isolation portion and seal the first accommodating space.

7. The filter assembly according to claim 3, characterized in that, The first connecting part and the filter frame are made of the same or similar metal material; and / or, the thickness of the first connecting part is D1, and the thickness of the filter membrane is D2, satisfying: D1≥3D2.

8. The filter assembly according to any one of claims 1 to 7, characterized in that, It also includes an annular structure of a separator, which is connected to the inner sidewall of the filter frame. The separator and the extension are located on opposite sides of the first connection area. The separator includes a second annular shell and a second isolation portion. The second annular shell is connected to the inner sidewall of the filter frame and defines a second receiving space. The second isolation portion is disposed in the second receiving space.

9. The filter assembly according to any one of claims 1 to 7, characterized in that, The number of filter frames is multiple, and the multiple filter frames are arranged parallel to each other and spaced apart.

10. A dust removal device, characterized in that, The filter assembly includes a backwash member and a filter assembly according to any one of claims 1 to 9, wherein the backwash member is disposed at one end near the first connection area of ​​the filter frame, and the backwash member is provided with a backwash medium channel through which the backwash medium flows into the filter assembly.

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