Blowback device of bag filter

Abstract

The utility model discloses a back flushing device of a bag filter. A plurality of groups of filter bags are arranged in the bag filter; the back flushing device comprises a main air inlet pipe, a main air outlet pipe and a back flushing pipe, wherein the main air inlet pipe is horizontally arranged above filter bags; the multiple groups of branch gas pipes are communicated with the main gas inlet pipe, the multiple groups of branch gas pipes and the multiple groups of filter bags are arranged in a one-to-one correspondence manner, and each group of branch gas pipes is provided with at least two gas outlets. According to the back-blowing device of the bag filter, the back-blowing structure is optimized, so that the uniform distribution of back-blowing airflow is realized, the uniformity and stability of back-blowing pressure of the filter bag are ensured, the uniformity and stability of polymer blanking are realized, and the smooth and unobstructed blanking is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of bag filters, and in particular relates to a back-flushing device for bag filters. Background Art

[0002] During normal production in the drying system of the polymerization workshop at Jilin Carbon Valley Carbon Fiber Co., Ltd., polymer powder, after being dried in a flash dryer, is carried by the wind onto the surface of the bag filter. After backflushing with compressed air, the polymer adsorbed on the filter bag surface is blown down into the discharge rotary valve and then into the material storage bin via a pipeline. The bag filter has multiple groups of filter bags, each with a backflushing port for compressed air backflushing. The backflushing ports are open, resulting in uneven backflushing pressure within each group. This prevents the material from falling evenly from each bag, leading to uneven material discharge and blockage.

[0003] Chinese patent application number 202120204823.1 discloses a bag filter with a high-efficiency back-blowing nozzle. The interior of the bag dust collector shell is divided into an upper cavity and a lower cavity by a fixed partition. Each bag filter element is located in the lower cavity. A number of through holes are opened on the fixed partition, one through hole corresponds to a bag filter element, and each bag filter element is connected to its corresponding through hole. The back-blowing main pipe and each back-blowing nozzle are located in the upper cavity. The inlet of each back-blowing nozzle is connected to the back-blowing main pipe, wherein one back-blowing nozzle corresponds to a through hole, and the outlet of each back-blowing nozzle is located directly above the corresponding through hole. This bag filter may be more suitable for dust of certain specific properties. For dust with high viscosity and easy to clump, additional treatment measures may be required to prevent bag clogging.

[0004] In view of this, the present utility model is proposed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the existing technology and provide a bag filter backflushing device, the purpose of which is to solve the problem of uneven material feeding and blockage caused by uneven backflushing pressure of the bag filter during production.

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0007] The utility model provides a bag filter backflushing device, comprising:

[0008] The main air inlet pipe is horizontally installed above the multiple groups of filter bags in the bag filter;

[0009] The multi-component air pipe is connected to the main air inlet pipe. The multi-component air pipe is arranged in a one-to-one correspondence with the multiple groups of filter bags, and each group of air pipe is provided with at least two air outlets.

[0010] Pipe support members are correspondingly provided above the multiple groups of filter bags, and the multiple groups of air pipes are arranged in one-to-one correspondence with the multiple groups of pipe support members.

[0011] Furthermore, each group of air distribution pipes includes: a first air distribution pipe, one end of which is connected to the main air inlet pipe and the other end of which extends toward the corresponding filter bag;

[0012] At least two branch air pipes are communicated with the extended end of the first branch air pipe, and the at least two air outlets are provided on the at least two branch air pipes in a one-to-one correspondence.

[0013] Furthermore, the first air distribution pipe and the main air intake pipe are connected by a flexible connector.

[0014] Furthermore, an air distribution valve is provided at the extended end of the first air distribution pipe, one end of each branch air distribution pipe is connected to the air distribution valve, and an air outlet is provided at the other end of the branch air distribution pipe.

[0015] Furthermore, the axis of the first air distribution pipe coincides with the central axis of the filter bag, and the two branch air distribution pipes arranged opposite to each other are symmetrical about the first air distribution pipe;

[0016] The distance between the air outlets of the two opposite branch air pipes is equal to the diameter of the filter bag.

[0017] Furthermore, the cross-sectional area of ​​the outlet end of each branch air pipe is larger than the cross-sectional area of ​​the connection end of the branch air pipe and the air distribution valve.

[0018] Furthermore, the branch air pipe and the air outlet are an integrally formed structure.

[0019] Furthermore, the back-flushing device is further provided with: a plurality of pressure detection units, which are arranged in a one-to-one correspondence with the plurality of filter bags to detect the pressure in the corresponding filter bags;

[0020] The control unit adjusts the air intake volume of the bronchus according to the pressure result detected by the pressure detection unit.

[0021] Furthermore, the backflush device is further provided with: a judgment unit, receiving the pressure value detected by the pressure detection unit and comparing it with a preset pressure value;

[0022] The control unit receives the comparison result of the judgment unit and adjusts the size of the bronchial air intake according to the comparison structure.

[0023] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art.

[0024] 1. The bag filter backflushing device provided by the utility model realizes the uniform distribution of the backflushing airflow and ensures the uniform and stable backflushing pressure of the filter bag by optimizing the backflushing structure, thereby achieving uniform and stable polymer feeding and ensuring smooth and unobstructed feeding; the device has the advantages of simple structure and easy maintenance, and is suitable for backflushing operations of various bag filters.

[0025] 2. The bag filter backflushing device provided by the utility model is set up in a one-to-one correspondence between multiple components of air pipes and multiple groups of filter bags, and each group of air pipes is provided with at least two air outlets, which can ensure that each filter bag can be evenly and fully backflushed, effectively ensuring that each filter bag can receive uniform pressure and ensure that the material falls evenly through backflushing.

[0026] 3. The bag filter backflushing device provided by this utility model incorporates multiple pressure detection units and control units, enabling real-time monitoring and intelligent regulation of pressure within the filter bags. When abnormal pressure within the filter bags is detected, the control unit automatically adjusts the air flow to the corresponding air distribution pipe, ensuring that each filter bag receives appropriate and necessary backflushing, thereby enhancing the automation and intelligence of the backflushing system.

[0027] 4. The cross-sectional area of ​​the outlet end of the branch air pipe of the bag filter backflush device provided by this utility model is larger than the cross-sectional area of ​​the end connecting the branch air pipe to the air distribution valve, which helps to diffuse the gas at the outlet and form a more uniform backflush airflow. At the same time, the flat air outlet design further increases the contact area between the airflow and the filter bag surface, improving backflush efficiency.

[0028] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

[0030] Figure 1 This is a schematic diagram of the main view of the back-flushing device of the bag filter of the utility model;

[0031] Figure 2 This utility model Figure 1 Enlarged schematic diagram of point A in the middle.

[0032] In the figure: 100, main air inlet pipe; 200, air distribution pipe; 210, first air distribution pipe; 220, branch air distribution pipe; 221, horizontal part; 222, vertical part; 230, air distribution valve; 300, air outlet.

[0033] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0036] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0037] like Figures 1 to 2 As shown, the utility model provides a bag filter back-flushing device, comprising: a main air inlet pipe 100, horizontally arranged above a plurality of filter bags in the bag filter;

[0038] The multi-component air pipe 200 is connected to the main air inlet pipe 100 . The multi-component air pipe 200 is arranged in a one-to-one correspondence with the multiple groups of filter bags. Each group of air pipes 200 is provided with at least two air outlets 300 .

[0039] In this embodiment, a plurality of groups of filter bags are provided inside the bag filter. A main air inlet pipe 100 for providing backflushing gas to the filter bags is provided at the upper portion of the filter bags. The main air inlet pipe 100 is arranged horizontally and mounted on the top of the bag filter, serving as the main input channel for the backflushing gas. Its diameter and material are selected based on the required backflushing gas flow rate and pressure to ensure that the gas can smoothly enter each gas distribution pipe 200. A multi-component air pipe 200 is provided on the side of the main air inlet pipe 100 facing the filter bags. The multi-component air pipe 200 is provided in a one-to-one correspondence with the plurality of groups of filter bags, achieving precise distribution of the backflushing gas and ensuring that each group of filter bags receives sufficient backflushing airflow. At least two air outlets 300 are provided on each group of air pipes 200, and these air outlets 300 can be flexibly adjusted according to the specific layout and size of the filter bags to evenly distribute the backflushing gas to the corresponding filter bags.

[0040] When the polymer adsorbed on the filter bag surface needs to be blown through the rotary valve for storage, backflush gas flows through the main inlet pipe 100 and into the multi-component air pipe 200. Within each component air pipe 200, the gas is evenly distributed to the various outlets 300 and ejected at a constant speed and pressure, directly impacting the filter bag surface. Due to the rational layout and number of outlets 300, the backflush airflow can fully cover every part of the filter bag, effectively stripping away material particles adhering to the bag.

[0041] Furthermore, pipe support members are correspondingly provided above the multiple groups of filter bags, and the multiple groups of air pipes are arranged in a one-to-one correspondence with the multiple groups of pipe support members.

[0042] In this embodiment, pipe supports are positioned above each of the multiple groups of filter bags to support the corresponding air distribution pipes. This prevents vibration or displacement during backflushing, while also minimizing the direct impact of the air distribution pipes on the filter bags, protecting them from damage. The one-to-one correspondence between the multiple groups of air pipes and the multiple groups of pipe supports makes the entire backflushing device compact, stable, and reliable.

[0043] Furthermore, each group of air distribution pipes 200 includes: a first air distribution pipe 210, one end of which is connected to the main air inlet pipe 100 and the other end of which extends toward the corresponding filter bag;

[0044] At least two branch air pipes 220 are connected to the extended end of the first branch air pipe 210 , and the at least two air outlets 300 are provided on the at least two branch air pipes 220 in a one-to-one correspondence.

[0045] In this embodiment, the air distribution pipe 200, mounted on the main air intake pipe 100, includes a first air distribution pipe 210. One end of the first air distribution pipe 210 is connected to the main air intake pipe 100, and the other end extends toward the filter bag. In other words, the first air distribution pipe 210 is arranged vertically. The material of the first air distribution pipe 210 must possess sufficient strength and corrosion resistance to withstand the pressure of the backflush gas and long-term use. Its diameter and length are customized based on the size and layout of the filter bag to ensure reasonable and effective airflow distribution.

[0046] At least two branch air pipes 220 are provided at the extended end of the first air pipe 210. These branch air pipes 220 are distributed around the first air pipe 210 at specific angles and distances to cover different areas of the filter bag. The number and layout of the branch air pipes 220 can be adjusted based on the specific shape and size of the filter bag to achieve optimal cleaning results.

[0047] Each branch air pipe 220 has an outlet 300 at its outlet end, which is used to eject backwash gas and impact the filter bag surface. The specific location and shape of the outlet 300 are designed based on factors such as the filter bag's material, thickness, and air permeability to ensure that the airflow can evenly and effectively backwash the filter bag surface, promoting the uniform fall of the polymer material.

[0048] After the backflush gas enters the multi-component air pipe 200 through the main air inlet pipe 100, it first enters the first branch air pipe 210 of each group. Within the first branch air pipe 210, the gas is further distributed to the various branch air pipes 220. The backflush gas then ejects from the outlets 300 of the branch air pipes 220, forming multiple air streams that simultaneously impact the filter bag surface. Because the axis of the first branch air pipe 210 coincides with the central axis of the filter bag, and the branch air pipes 220 are strategically distributed, the backflush airflow ensures comprehensive coverage of all areas of the filter bag, achieving efficient and uniform backflush and ensuring even drop of the polymer material.

[0049] Furthermore, the first air distribution pipe 210 is connected to the main air intake pipe 100 by a flexible connector.

[0050] In this embodiment, the first air distribution pipe 210 and the main air intake pipe 100 are connected by a soft connector. The soft connector, such as a rubber hose, a bellows, etc., can effectively absorb vibration and displacement, and can ensure that the connection remains sealed under these dynamic conditions, while reducing damage or loosening of components that may be caused by vibration transmission.

[0051] Furthermore, an air distribution valve 230 is provided at the extended end of the first air distribution pipe 210 , one end of each branch air distribution pipe 220 is connected to the air distribution valve 230 , and an air outlet 300 is provided at the other end of the branch air distribution pipe 220 .

[0052] In this embodiment, an air distribution valve 230 is provided at the extended end of the first air distribution pipe 210. The air distribution valve 230 can adjust the backwash gas flow and pressure entering each branch air distribution pipe 220 according to the preset control logic or external signal, thereby achieving precise distribution of the airflow. The specific structure of the air distribution valve 230 can be designed according to actual needs, but generally includes a valve body, a valve core, an actuator and other parts. A channel is provided inside the valve body that is connected to the first air distribution pipe 210 and the branch air distribution pipe 220. The valve core is moved in the channel by the drive of the actuator to change the cross-sectional area of ​​the channel or the open / closed state, thereby controlling the flow direction and flow of the airflow.

[0053] Furthermore, the axis of the first air distribution pipe 210 coincides with the central axis of the filter bag, and the two oppositely arranged branch air pipes 220 are symmetrical about the first air distribution pipe 210; the distance between the air outlets 300 of the two opposite branch air pipes 220 is equal to the diameter of the filter bag.

[0054] In this embodiment, the two opposing branch air pipes 220 are symmetrically arranged relative to the first branch air pipe 210, and the distance between the air outlets 300 of the two opposing branch air pipes 220 is ensured to be the same as the diameter of the filter bag, which helps maintain the balance of the entire backflushing system. During the backflushing process, due to the uniformity of the airflow distribution, the impact force on the filter bag is also more balanced, reducing the risk of damage to the filter bag due to excessive local force. The distance between the air outlets 300 matches the diameter of the filter bag, which can ensure that the backflushing airflow directly impacts the surface of the filter bag, reducing the diffusion and loss of the airflow. This direct impact method helps to increase the pressure of the backflushing gas on the filter bag, making it easier to peel the material.

[0055] Furthermore, the cross-sectional area of ​​the outlet end of each branch air pipe 220 is larger than the cross-sectional area of ​​the connection end between the branch air pipe 220 and the air distribution valve 230 .

[0056] Furthermore, the branch air pipe 220 and the air outlet 300 are an integrally formed structure.

[0057] Furthermore, the air outlet 300 is flat.

[0058] In this embodiment, the cross-sectional area of ​​the outlet end of the branch air pipe 220 is larger than the cross-sectional area of ​​the connection end of the branch air pipe 220 and the air separation valve 230, which can increase the pressure of the gas in the pipeline. The branch air pipe 220 is designed to include two parts: a horizontal portion 221 and a vertical portion 222. The air inlet end of the horizontal portion 221 is connected to the air outlet end of the air separation valve 230, and is responsible for receiving the backwash gas from the first air separation pipe 210. The vertical portion 222 is connected to the air outlet end of the horizontal portion 221 and extends downward to the vicinity of the filter bag so as to directly guide the gas to the surface of the filter bag. The vertical portion 222 and the horizontal portion 221 are connected by an arc-shaped transition section to reduce the loss of air volume. This design allows the branch air pipe 220 to flexibly adjust its direction and angle to adapt to filter bags of different layouts and sizes. At the same time, the combination of the horizontal portion 221 and the vertical portion 222 is also convenient for installation and maintenance.

[0059] In order to improve the back-blowing effect, the cross-sectional area of ​​the outlet end of the branch air pipe 220 is larger than the cross-sectional area of ​​the connection end of the branch air pipe 220 and the air distribution valve 230. Specifically, the cross-sectional area of ​​the outlet end of the vertical portion 222 is larger than the cross-sectional area of ​​the inlet end; preferably, the vertical portion 222 is a conical structure; after the back-blowing gas enters the vertical portion 222, it is squeezed in the vertical portion 222, and the pressure is increased, so that the back-blowing airflow impacts the filter bag surface more forcefully; at the same time, the air outlets 300 of two adjacent vertical portions 222 can be close to each other, reducing the blind spot between the two air outlets 300 and increasing the purge area.

[0060] The air outlet 300 is designed to be flat. This shape can increase the contact area between the airflow and the filter bag surface, making the backwash airflow more evenly distributed on the filter bag. At the same time, the flat air outlet 300 can also reduce the diffusion and loss of airflow, thereby improving the backwash efficiency.

[0061] To improve structural stability and reliability, we used one-piece molding technology to manufacture the branch air pipe 220 and the air outlet 300. This not only simplifies the manufacturing process but also reduces the number of connection points between components and the potential risk of leakage. The one-piece molding structure is also easier to clean and maintain, extending the service life of the equipment.

[0062] Furthermore, the back-flushing device is further provided with: a plurality of pressure detection units, which are arranged in a one-to-one correspondence with the plurality of filter bags to detect the pressure in the corresponding filter bags;

[0063] The control unit adjusts the air intake volume of the air distribution pipe 200 according to the pressure result detected by the pressure detection unit.

[0064] Furthermore, the backflush device is further provided with: a judgment unit, receiving the pressure value detected by the pressure detection unit and comparing it with a preset pressure value;

[0065] The control unit receives the comparison result of the judgment unit and adjusts the amount of air intake of the air distribution pipe 200 according to the comparison result.

[0066] In this embodiment, to more accurately monitor the pressure within the filter bags, the backflush device incorporates multiple pressure detection units. Each unit corresponds to a specific filter bag or bag area, providing real-time monitoring and feedback of the bag pressure. The primary function of these units is to collect pressure data within the bag, providing a basis for subsequent assessment and control. By monitoring pressure changes within the bag in real time, potential material blockages can be promptly identified and addressed.

[0067] The control unit is the core component of the entire backflush device, which dynamically adjusts the air intake volume of the gas distribution pipe 200 according to the pressure data detected by the pressure detection unit or the comparison result of the judgment unit.

[0068] When the control unit receives data from the pressure detection unit, it analyzes it to determine the bag's material loading status. If the pressure inside the bag is too high, it indicates that the backflushing intensity needs to be increased to allow the material to fall and clear the accumulated material inside the bag. If the pressure is moderate or low, the air intake may need to be reduced to avoid excessive backflushing and waste of resources. Based on these judgments, the control unit adjusts the air intake of the air distribution pipe 200 to achieve the best backflushing effect.

[0069] The judgment unit, located between the pressure detection unit and the control unit, receives the pressure reading from the pressure detection unit and compares it with a preset pressure value. Based on this comparison, the judgment unit can preliminarily determine the polymer material discharge status within the filter bag. The judgment unit transmits the comparison result to the control unit, which further analyzes the received result and makes appropriate adjustments. This design enables the backflush device to automatically adjust the backflush intensity based on the actual backflush situation of the filter bag, improving the device's intelligence and response speed.

[0070] By introducing multiple sets of pressure detection units, control units and judgment units, the intelligence level and backflushing effect of the bag filter backflushing device are further improved, and more accurate and efficient backflushing control is achieved, ensuring that the material adsorbed on the surface of the filter bag can smoothly enter the storage bin, preventing the filter bag from being blocked.

[0071] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments with equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A bag filter backflushing device, characterized in that: include: The main air inlet pipe is horizontally installed above the multiple groups of filter bags in the bag filter; The multi-component air pipe is connected to the main air inlet pipe. The multi-component air pipes are arranged in a one-to-one correspondence with the multiple groups of filter bags. Each group of air pipes is provided with at least two air outlets. Each group of air distribution pipes includes a first air distribution pipe, an extended end of which is provided with an air distribution valve, one end of each branch air distribution pipe is connected to the air distribution valve, and an air outlet is provided at the other end of the branch air distribution pipe.

2. The bag filter backflushing device according to claim 1, characterized in that: Pipe support members are correspondingly provided above the multiple groups of filter bags, and the multiple groups of air pipes are arranged in one-to-one correspondence with the multiple groups of pipe support members.

3. The bag filter backflushing device according to claim 2, characterized in that: Each set of tracheal tubes includes: A first air distribution pipe, one end of which is connected to the main air inlet pipe and the other end of which extends toward the corresponding filter bag; At least two branch air pipes are communicated with the extended end of the first branch air pipe, and the at least two air outlets are provided on the at least two branch air pipes in a one-to-one correspondence.

4. The bag filter backflushing device according to claim 3, characterized in that: The first air distribution pipe is connected to the main air intake pipe by a flexible connector.

5. The bag filter backflushing device according to claim 3, characterized in that: The axis of the first air distribution pipe coincides with the central axis of the filter bag, and the two branch air distribution pipes arranged opposite to each other are symmetrical about the first air distribution pipe; The distance between the air outlets of the two opposite branch air pipes is equal to the diameter of the filter bag.

6. The bag filter backflushing device according to claim 5, characterized in that: The cross-sectional area of ​​the outlet end of each branch air pipe is larger than the cross-sectional area of ​​the connection end of the branch air pipe and the air distribution valve.

7. The bag filter backflushing device according to claim 6, characterized in that: The branch air pipe and the air outlet are an integrally formed structure.

8. The bag filter backflushing device according to any one of claims 1 to 7, characterized in that: The back-flushing device is further provided with: a plurality of pressure detection units, which are arranged in a one-to-one correspondence with the plurality of filter bags to detect the pressure in the corresponding filter bags; The control unit adjusts the air intake volume of the air distribution pipe according to the pressure result detected by the pressure detection unit.

9. The bag filter backflushing device according to claim 8, characterized in that: The backflush device is further provided with: a judgment unit, receiving the pressure value detected by the pressure detection unit and comparing it with a preset pressure value; The control unit receives the comparison result of the judgment unit and adjusts the size of the air intake volume of the air distribution pipe according to the comparison result.

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