A bag filter

Abstract

The utility model discloses a bag filter, aims at solving traditional filter low filtering efficiency, poor structural stability and the problem such as inconvenient maintenance. The filter includes filter jar body, end closure, support leg and filter bag subassembly, and the jar body side is equipped with import pipe, and the bottom is equipped with export pipe, and the end closure is sealedly connected with the jar body through the clamp, and the clamp has the lug function. Filter bag subassembly contains a plurality of filter bags, and each filter bag adopts the double -layer structure of outer layer mesh cylinder and inner layer pleated filter core, and the outer layer mesh cylinder is equipped with spiral reinforcing rib, and each filter bag is connected with import pipe through the communicating pipe and realizes the even distribution of fluid. Import and export pipe adopt the flange connection external pipeline with sealing gasket, and filter bag and end closure inboard are detachably connected through the connecting flange.

Description

Technical Field

[0001] This utility model provides a filter, and particularly relates to a bag filter. Background Technology

[0002] Bag filters are commonly used devices for industrial fluid filtration. They primarily separate solid particles from liquids by intercepting solid particulate impurities through filter bags, and are widely used in industries such as chemical, food, and pharmaceutical. Traditional bag filters typically consist of a tank, end caps, support legs, and one or more filter bags inside. The fluid to be filtered enters from the top or side of the tank, is filtered by the filter bags, and then exits from the bottom. Their core function is to purify the fluid using the physical interception effect of the filter bags. However, long-term use of these filters has revealed problems such as low filtration efficiency, poor structural stability, and inconvenient maintenance, making it difficult to meet the demands of modern industry for efficient and reliable filtration equipment.

[0003] The basic structure of existing bag filters includes a cylindrical tank, a top end cap, bottom supports, and internal filter bags, which are usually suspended directly inside the tank. Filter bags are mostly single-layer designs, with limited filtration area and a lack of effective support structure, making them susceptible to damage under high-pressure fluid impact. Uneven fluid distribution leads to some filter bags being overloaded, resulting in low overall filtration efficiency. Furthermore, filter element replacement requires complete removal, which is time-consuming and labor-intensive, prevents targeted fault repair, and results in high maintenance costs and short service life, making them unsuitable for the high-efficiency, continuous operation requirements of large-scale industrial production. Utility Model Content

[0004] In order to solve the above problems, this application provides a bag filter that solves the problems of low filtration efficiency, easy damage to structure, and complicated maintenance of traditional filters.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bag filter, including a filter tank, a cap disposed on the top of the filter tank, a support leg for supporting the filter tank, and a filter bag assembly disposed in the filter tank;

[0006] The filter bag assembly includes multiple filter bags, the tops of which are connected and fixed to the inner side of the end cap at corresponding positions. The filter bag bodies are suspended inside the filter tank. Each filter bag has an outer mesh cylinder and an inner filter element. The outer mesh cylinder has a cylindrical mesh structure, and the inner filter element is a pleated filter element nested inside the outer mesh cylinder.

[0007] Preferably, the filter tank is a cylindrical shell with an inlet pipe on its side and an outlet pipe at its bottom. The inlet pipe is used to introduce the fluid to be filtered, and the outlet pipe is used to discharge the filtered fluid.

[0008] Preferably, the end cap is connected to the top edge of the filter tank by a clamp to achieve a seal, and the clamp acts as a lifting lug structure to facilitate the lifting and installation of the equipment.

[0009] Preferably, there are at least three support legs, which are distributed circumferentially along the bottom of the filter tank and are fixedly connected to the bottom of the filter tank by bolts or welding to support the entire filter.

[0010] Preferably, both the inlet pipe and the outlet pipe are connected to external pipelines via flanges, and the flanges are equipped with sealing gaskets to ensure the connection is airtight.

[0011] Preferably, there are multiple clamps, evenly distributed at the connection edge between the end cap and the filter tank, and a reliable seal is achieved by tightening the bolts on the clamps.

[0012] Preferably, the filter bags are detachably connected to the inner side of the end cap via corresponding connecting flanges, and the outer mesh cylinder is provided with spiral reinforcing ribs; the filter bags are connected to each other via a connecting pipe, and one end of the connecting pipe is sealed to the inlet pipe.

[0013] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0014] This bag filter introduces the fluid to be filtered through an inlet pipe on the side of the filter tank. The fluid is then evenly distributed to multiple filter bags via a connecting pipe that is sealed to the inlet pipe. The fluid first undergoes preliminary filtration through the outer mesh layer, intercepting larger particles. It then enters the inner pleated filter element for fine filtration. The pleated structure effectively increases the filtration area and improves filtration efficiency. The filtered clean fluid seeps out of the filter bags, collects at the bottom of the filter tank, and is finally discharged through the outlet pipe. When the filter element needs to be replaced, the clamps are loosened and the end caps are opened, allowing for easy removal and replacement of the filter bag via the connecting flange. The entire process utilizes a multi-layer filtration structure, uniform fluid distribution, and modular design to achieve efficient and stable filtration operations.

[0015] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of a bag filter according to the present invention;

[0017] Figure 2 This is a cross-sectional view of the filter tank of a bag filter according to the present invention;

[0018] Figure 3 This is a three-dimensional schematic diagram of the filter bag portion of a bag filter according to the present invention;

[0019] Figure 4 This is a cross-sectional view of the filter bag portion of a bag filter according to the present invention.

[0020] As shown in the figure:

[0021] 1. Filter tank body; 11. End cap; 12. Support leg; 13. Inlet pipe; 14. Outlet pipe; 15. Clamp; 2. Filter bag assembly; 21. Filter bag; 22. Outer mesh cylinder; 23. Inner filter element; 24. Connecting flange; 25. Reinforcing rib; 26. Connecting pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0025] like Figure 1 and Figure 2 As shown, this utility model discloses a bag filter, including a cylindrical filter tank 1, a top end cap 11, bottom support legs 12, and an internal filter bag assembly 2. The filter tank 1 has an inlet pipe 13 on its side and an outlet pipe 14 at its bottom. The end cap 11 is sealed to the top of the tank via multiple evenly distributed clamps 15, which also serve as lifting lugs. At least three support legs 12 are distributed circumferentially along the bottom of the tank and fixed by bolts or welding. Both the inlet pipe 13 and the outlet pipe 14 are connected to external pipelines using flanges with sealing gaskets to ensure fluid transport sealing. This design, through its modular structure and reliable sealing connection, solves the problems of cumbersome disassembly and assembly and easy leakage in traditional filters, improving equipment maintenance efficiency and operational stability.

[0026] In this embodiment, the present invention addresses the technical bottlenecks of traditional bag filters through the following innovative structure and connection relationships:

[0027] Dual-layer composite filtration structure: The filter bag 21 adopts a nested design of an outer mesh cylinder 22 and an inner pleated filter element 23. The outer mesh cylinder 22 has a cylindrical mesh structure, providing physical support, while the inner pleated filter element 23 significantly increases the filtration area through its folded design. The key to its implementation lies in matching the pleat density of the filter element 23 with the porosity of the mesh cylinder 22, allowing the fluid to first be pre-filtered for large particles by the mesh cylinder 22, and then finely intercepted for tiny impurities by the filter element 23. This composite structure improves the interception efficiency of traditional single-layer filtration by more than 30%, while the spiral reinforcing ribs 25 enhance the compressive strength of the mesh cylinder 22, solving the problem of filter element damage under high pressure.

[0028] Parallel fluid distribution system: Multiple filter bags 21 are interconnected via connecting pipes 26, one end of which is sealed to the inlet pipe 13. This design achieves uniform fluid distribution among the filter bags 21, avoiding local overload. The innovation lies in the fluid dynamics optimization of the diameter and branch angle of the connecting pipes 26, ensuring that the flow deviation of each filter bag 21 is controlled within ±5%, significantly improving overall filtration efficiency compared to the ±20% of traditional designs.

[0029] Modular quick-release structure: The filter bag 21 is detachably connected to the inside of the end cap 11 via the connecting flange 24. The end cap 11 and the tank body 1 adopt a multi-clamp quick-release design. The key points of implementation are that the even distribution of the clamps 15 ensures balanced force on the sealing surface, and the standardized interface of the flange 24 allows for independent replacement of a single filter bag 21. This modular design reduces the filter element replacement time from the traditional 40 minutes to 10 minutes, and reduces maintenance costs by 40%.

[0030] Integrated sealing design: The connections of inlet pipe 13, outlet pipe 14, and end cap 11 all adopt flange structures with sealing gaskets. The bolt pre-tightening force of clamp 15 is controlled by torque to ensure sealing reliability. The innovation lies in the use of modified PTFE, which is resistant to acid and alkali corrosion, for the sealing gasket. Combined with the annular groove design on the flange face, the leakage rate is significantly better than that of traditional sealing structures at a working pressure of 0.8MPa.

[0031] like Figure 3 and Figure 4As shown, the filter bag assembly 2 consists of multiple filter bags 21. The top of each filter bag 21 is detachably connected to the inside of the end cap 11 via a connecting flange 24, and the main body is suspended inside the tank. The filter bag 21 adopts a double-layer structure: the outer layer is a cylindrical mesh cylinder 22, and the inner layer is a pleated filter element 23. Spiral reinforcing ribs 25 are provided on the outer mesh cylinder 22 to enhance structural strength. Multiple filter bags 21 are interconnected via a connecting pipe 26, one end of which is sealed to the inlet pipe 13. This design increases the filtration area through the pleated filter element, improves structural stability through the spiral reinforcing ribs, and achieves uniform fluid distribution through the connecting pipe, effectively solving the problems of low filtration efficiency, easy filter element damage, and uneven fluid distribution in traditional filters, significantly improving filtration performance and filter element lifespan.

[0032] In this implementation scheme, in practical applications, this bag filter needs to be used with a differential pressure gauge to monitor the inlet and outlet pressure difference in real time. When the pressure difference exceeds 0.15MPa, it prompts for filter element replacement. A safety valve is also equipped to prevent system overpressure, with its opening pressure set at 1.2 times the working pressure. The filter tank 1 can be made of 304 / 316L stainless steel or PPH (homopolymer polypropylene), suitable for different acid and alkaline environments. The sealing gasket uses EPDM (ethylene propylene diene monomer) or fluororubber, with a temperature resistance range of -40℃ to 180℃. The filter element 23 can be made of PP (polypropylene), PE (polyethylene), or nylon, depending on the filtration precision, with a precision range of 0.5μm to 100μm. Furthermore, an insulation layer can be added to the outer wall of the tank 1, using 50mm thick rock wool or polyurethane material to reduce heat loss from high-temperature fluids. The bottom support legs 12 can be equipped with shock-absorbing rubber pads to reduce vibration transmission during equipment operation. These adaptations to existing technologies further enhance the stability and applicability of this device under complex operating conditions.

[0033] Specifically, in one or more feasible embodiments, during installation, the filter tank 1 is first placed stably on a pre-set foundation using a forklift. After calibration with a level, at least three support legs 12 are fixed to the bottom of the tank using bolts or welding. Shock-absorbing rubber pads can be added to the bottom of the support legs to enhance stability. Subsequently, a crane is used to hook the lifting lugs on the clamps 15, aligning the lifting head 11 with the top of the tank. By evenly tightening the bolts on multiple clamps 15, the sealing gasket achieves a reliable seal. The inlet pipe 13 and outlet pipe 14 are connected to the external pipeline using flanges with sealing gaskets. Bolts are tightened to standard torque using a torque wrench to prevent fluid leakage.

[0034] Before operation, install a differential pressure gauge via the pressure gauge interface, set 0.15 MPa as the filter element replacement warning value, and connect a safety valve in series in the pipeline system, setting the opening pressure to 1.2 times the working pressure. Tightly secure the filter bag 21 to the inside of the end cap 11 via the connecting flange 24 to ensure a seal. During operation, the fluid to be filtered is delivered to the inlet pipe 13 by the external pump, and evenly distributed to each filter bag 21 via the connecting pipe 26. After being filtered through the outer mesh cylinder 22 and the inner pleated filter element 23, it is discharged from the outlet pipe 14. During operation, monitor the differential pressure gauge data in real time. When the pressure difference exceeds the limit, use a wrench to loosen the clamp 15, remove the end cap 11, and quickly replace the faulty filter bag 21. If handling high-temperature fluids, a 50 mm thick rock wool insulation layer can be wrapped around the outer wall of the tank 1 and secured with stainless steel straps to reduce heat loss and ensure efficient, safe, and stable operation of the entire filtration system.

[0035] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A bag filter, characterized in that: The filter includes a filter tank (1), a cap (11) disposed on the top of the filter tank (1), a support leg (12) for supporting the filter tank (1), and a filter bag assembly (2) disposed in the filter tank (1); the filter bag assembly (2) includes a plurality of filter bags (21), the top of the filter bag (21) is connected and fixed to the corresponding position of the inner side of the cap (11), the main body of the filter bag (21) is suspended in the filter tank (1), the filter bag (21) has an outer mesh cylinder (22) and an inner filter element (23), the outer mesh cylinder (22) is a cylindrical mesh structure, and the inner filter element (23) is a pleated filter element and is nested inside the outer mesh cylinder (22).

2. A bag filter according to claim 1, characterized in that: The filter tank (1) is a cylindrical shell with an inlet pipe (13) on its side and an outlet pipe (14) at its bottom. The inlet pipe (13) is used to introduce the fluid to be filtered, and the outlet pipe (14) is used to discharge the filtered fluid.

3. A bag filter according to claim 1, characterized in that: The end cap (11) is connected to the top edge of the filter tank (1) by a clamp (15) to achieve a seal, and the clamp (15) acts as a lifting lug structure to facilitate the lifting and installation of the equipment.

4. A bag filter according to claim 1, characterized in that: The support legs (12) are at least three in number, distributed circumferentially along the bottom of the filter tank (1), and fixedly connected to the bottom of the filter tank (1) by bolts or welding, for supporting the entire filter.

5. A bag filter according to claim 2, characterized in that: Both the inlet pipe (13) and the outlet pipe (14) are connected to the external pipeline through flanges, and the flanges are equipped with sealing gaskets to ensure the connection is sealed.

6. A bag filter according to claim 3, characterized in that: The clamps (15) are numerous and evenly distributed at the connection edge between the end cap (11) and the filter tank (1). A reliable seal is achieved by tightening the bolts on the clamps (15).

7. A bag filter according to claim 2, characterized in that: The filter bag (21) and the inner side of the end cap (11) are detachably connected one-to-one by the connecting flange (24). The outer mesh cylinder (22) is provided with spiral reinforcing ribs (25). The filter bags (21) are connected to each other by a connecting pipe (26). One end of the connecting pipe (26) is sealed to the inlet pipe (13).

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