A reverse-blowing dust removal device for bag filters

Abstract

This utility model discloses a reverse-blowing cleaning device for baghouse dust collectors, comprising a plurality of dust collector filter bags and a main blowing pipe located above the filter bags. A plurality of branch blowing pipes are connected to the lower side of the main blowing pipe. Linear bearings are slidably connected to the outer sides of the branch blowing pipes. A fixed sleeve is provided on the outer periphery of the end of each branch blowing pipe and extends into the corresponding filter bag. A plurality of connecting plates are arranged in a ring at equal intervals around the axis of the branch blowing pipes at the bottom of the linear bearings. The upper part of the connecting plates is hinged to the upper end of support rod one, the lower end of support rod two is hinged to the upper end of support rod two, the lower part of the connecting plates is hinged to the upper end of support rod three, the lower end of support rod three is hinged to support rod four, the upper end of support rod four is hinged to support rod two, and the lower end is hinged to the fixed sleeve. The outer sides of the support rods one and two are connected as one unit by a sealing cloth cover. The linear bearing can move closer to or further away from the fixed sleeve, allowing the sealing cloth cover to switch between an open and folded state. This utility model can improve airflow utilization and cleaning efficiency.

Description

Technical Field

[0001] This utility model relates to the field of bag filter technology, and in particular to a reverse-blowing dust removal device for bag filters. Background Technology

[0002] Baghouse dust collectors are widely used in various dust removal applications, such as flue gas dust removal and air purification, due to their high filtration efficiency. The dust removal efficiency of a baghouse dust collector is largely related to the effectiveness of its reverse-air cleaning of the filter bags; therefore, reverse-air cleaning of the filter bags is one of the key technologies affecting the dust removal efficiency of baghouse dust collectors.

[0003] Existing reverse-air cleaning devices for baghouse dust collectors all use suspended, fixed nozzles positioned directly above the filter bags. High-pressure pulsed airflow is used to reverse-air the bags, causing them to vibrate and dislodge the dust adhering to their surface. This allows the filter bags to be cleaned and regenerated for continued dust collection. However, this fixed, suspended reverse-air cleaning structure has several drawbacks: because the nozzles are suspended and fixed above the filter bag openings, the open design causes some reverse-air flow to leak out, reducing the airflow entering the bags and affecting the efficiency of the reverse-air flow. Furthermore, during reverse-air cleaning, the continued discharge of clean air from the bags causes convection interference from the reverse airflow, resulting in not only a loss of reverse-air pressure but also insufficient vibration during cleaning. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a reverse-blowing dust removal device for bag filters, which significantly improves airflow utilization and dust removal efficiency.

[0005] The purpose of this utility model is achieved as follows: A reverse-blowing dust removal device for bag filters includes several dust filter bags and a main blowing pipe located above the dust filter bags. The main blowing pipe has several blowing branch pipes corresponding to the dust filter bags connected to its lower side. A linear bearing is slidably connected to the outer side of each blowing branch pipe. A fixed sleeve is provided on the outer periphery of the end of each blowing branch pipe and extends into the corresponding dust filter bag. Several connecting plates are arranged in a ring at equal intervals around the axis of the blowing branch pipe at the bottom of the linear bearing. The upper part of the connecting plate is hinged to the upper end of support rod one, the lower end of support rod two is hinged to the upper end of support rod two, the lower part of the connecting plate is hinged to the upper end of support rod three, the lower end of support rod three is hinged to support rod four, the upper end of support rod four is hinged to support rod two, and the lower end is hinged to the fixed sleeve. The outer sides of several support rods one and two are connected as one unit by a sealing cloth cover. The linear bearing can move closer to or further away from the fixed sleeve to allow the sealing cloth cover to switch between an open and folded state.

[0006] Compared with existing technologies, in the non-dust-cleaning state, the linear bearing is away from the fixed sleeve, and the sealing cloth cover is kept folded by the linkage mechanism (the linkage structure formed by the hinge of support rod one to support rod four and the connecting plate), which does not interfere with the normal filtration of the filter bag. When dust cleaning is required, the linear bearing slides along the blow-off branch pipe towards the fixed sleeve, and the linkage mechanism is pulled open, causing the sealing cloth cover to tightly wrap the gap between the filter bag and the blow-off branch pipe, forming a local sealed space. At this time, the back-blowing airflow enters the sealed area through the blow-off main pipe and blow-off branch pipe, and concentrates to impact the inner wall of the filter bag, causing it to expand and contract violently to shake off the accumulated dust. After the dust cleaning is completed, the linear bearing moves in the opposite direction to reset, and the linkage mechanism drives the sealing cloth cover to fold again, and the filter bag returns to the filtration state.

[0007] The beneficial effects of this utility model are as follows: through the synergistic effect of dynamic sealing and airflow concentration, efficient dust removal is achieved while avoiding cross-flow interference; after the sealing cloth cover is unfolded, it covers the bag opening of the filter bag, so that the dust collector filter bag is in an offline working state. This not only ensures that the high-pressure back-blowing airflow does not leak out and is used entirely for back-blowing dust removal of the filter bag without any loss, but also, due to the absence of interference from the opposing airflow of the filter, the airflow sprayed from the jet branch pipe can act on the filter bag 100%, so that the back-blowing airflow maintains sufficient pressure to blow to the bottom of the filter bag and forms a strong vibration on the filter bag, which significantly improves the airflow utilization rate and dust removal efficiency.

[0008] As a further improvement of this utility model, several of the linear bearings are connected as a whole by a connecting rod.

[0009] As a further improvement of this utility model, the opening of the dust removal filter bag is fixed to the sealing plate, and a plurality of cylinders are provided on the upper side of the sealing plate, with the piston rod end of the cylinder being fixedly connected to the connecting rod.

[0010] As a further improvement of this utility model, an annular positioning plate is provided on the outer periphery of the fixing sleeve, and several slots are provided on the outer side of the annular positioning plate to form a locking structure with the lower ends of the two support rods.

[0011] As a further improvement of this utility model, the length of the first support rod is 1 / 5 to 1 / 4 of the length of the second support rod.

[0012] As a further improvement of this utility model, the second support rod is hinged to the upper end of the fourth support rod at a distance of 1 / 4 to 1 / 3 of its own length from its upper end via a hinge shaft.

[0013] As a further improvement of this utility model, the fourth support rod is hinged to the lower end of the third support rod at a distance of 1 / 3 to 1 / 2 of its own length from the upper end via a hinge shaft.

[0014] As a further improvement of this utility model, the sealing cloth cover is made of polytetrafluoroethylene fiber cloth. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of a partial internal structure of a bag filter dust collector.

[0017] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0018] Figure 3 This is a schematic diagram of the sealed fabric cover in its folded state.

[0019] Figure 4 This is a cross-sectional view of the annular positioning plate.

[0020] The components include: 1. Dust filter bag; 2. Main jet cleaning pipe; 3. Branch jet cleaning pipe; 4. Linear bearing; 5. Fixing sleeve; 6. Connecting plate; 7. Support rod one; 8. Support rod two; 9. Support rod three; 10. Support rod four; 11. Sealing cloth cover; 12. Connecting rod; 13. Sealing plate; 14. Cylinder; 15. Annular positioning plate; 16. Slot; 17. Hinge shaft. Detailed Implementation

[0021] 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.

[0022] like Figure 1-4The reverse-flushing cleaning device for bag filters shown includes seven dust filter bags 1 and a main jet cleaning pipe 2 located above the dust filter bags 1. Seven jet cleaning branch pipes 3, each corresponding to the opening of a dust filter bag 1, are connected to the lower side of the main jet cleaning pipe 2. Linear bearings 4 are slidably connected to the outer side of each jet cleaning branch pipe 3. A fixing sleeve 5 is provided on the outer periphery of the end of each jet cleaning branch pipe 3 and extends into the corresponding dust filter bag 1. Six connecting pipes are arranged at equal intervals in a ring around the axis of the jet cleaning branch pipe 3 at the bottom of the linear bearing 4. Plate 6, the upper part of connecting plate 6 is hinged to the upper end of support rod 1 7, the lower end of support rod 1 7 is hinged to the upper end of support rod 2 8, the lower part of connecting plate 6 is hinged to the upper end of support rod 3 9, the lower end of support rod 3 9 is hinged to support rod 4 10, the upper end of support rod 4 10 is hinged to support rod 2 8, and the lower end is hinged to fixed sleeve 5. The outer sides of support rod 1 7 and support rod 2 8 are connected as one unit by sealing cloth cover 11. Linear bearing 4 can be close to or away from fixed sleeve 5 so that sealing cloth cover 11 can switch between open and folded states.

[0023] Ensure that the sealed space corresponding to each filter bag is formed or released synchronously, so that the backflushing airflow can be concentrated on all target filter bags at the same time. Connect the seven linear bearings 4 into one unit through the connecting rod 12. The connecting rod 12 integrates the dispersed linear bearings 4 into an "integrated module", which greatly improves the rigidity of axial sliding. On the one hand, the connecting rod 12 can constrain the radial swing of the linear bearings 4 and reduce the offset and jamming caused by the vibration of the blow-off branch pipe 3 or dust scouring. On the other hand, the load is evenly distributed when moving synchronously, avoiding excessive friction on a single linear bearing 4, reducing mechanical wear and extending the service life of the components.

[0024] The opening of the dust collector filter bag 1 is fixed on the sealing plate 13. The sealing plate 13 is welded and fixed to the inner wall of the bag dust collector around its perimeter. Two cylinders 14 are installed on its upper side. The piston rod ends of the two cylinders 14 are fixed to the connecting rod 12 by welding. The cylinder 14 can drive all linear bearings 4 to slide synchronously with a single action, avoiding the problem of asynchronous opening / folding of the sealing cloth cover 11 due to response delay or resistance difference when driven independently. This ensures that the sealed space corresponding to each filter bag is formed or released uniformly, and the back-blowing airflow is synchronously concentrated on the target filter bag, improving the uniformity of dust removal.

[0025] In non-dust cleaning conditions, the sealing cloth cover 11 needs to remain folded to avoid hindering the normal filtration of the filter bag. Therefore, an annular positioning plate 15 is set on the outer periphery of the fixing sleeve 5. The outer side of the annular positioning plate 15 has six slots 16 for engaging with the lower end of the support rod 8. By engaging the lower end of the support rod 8 with the slots 16 of the annular positioning plate 15, a mechanical lock is formed. On the one hand, this prevents the support rod 8 from shifting slightly due to the filter bag itself, flue gas flow vibration, or equipment operating noise, which could cause the sealing cloth cover 11 to partially unfold unexpectedly and affect the efficiency of clean gas discharge. On the other hand, the engaging structure "fixes" the folded shape of the sealing cloth cover 11, ensuring that the initial position of each component is consistent before each dust cleaning, and improving the repeatability of the dust cleaning action.

[0026] To optimize the compactness of the folded state and reduce the space occupied during non-dust cleaning operations, the length of support rod 1 7 is 1 / 4 of the length of support rod 2 8. Support rod 2 8 is hinged to the upper end of support rod 4 10 via hinge pin 17 at 1 / 3 of its own length from the top. Support rod 4 10 is hinged to the lower end of support rod 3 9 via hinge pin 17 at 1 / 3 of its own length from the top.

[0027] The sealing cloth cover 11 is made of polytetrafluoroethylene (PTFE) fiber cloth. Compared with ordinary fiber cloth (such as cotton, polyester) or silicone rubber coated glass fiber cloth, PTFE will not soften, shrink or become brittle due to high temperature. This avoids the sealing cloth cover 11 from being stuck due to heat deformation or the gap increasing after unfolding, ensuring the long-term effectiveness of the sealed space during dust removal.

[0028] The advantages of this utility model are: the length ratio of the connecting rod 12 and the hinge point are optimized, making the mechanism fold compactly and unfold smoothly; the sealing cloth cover 11 fits against the inner wall of the filter bag to form a local sealed space, and the concentrated back-blowing airflow can efficiently clean the dust, reducing air leakage and local wear; the device as a whole has the advantages of high dust cleaning efficiency, long filter bag life, high system reliability and low maintenance cost, which significantly improves the operational stability and economy of the bag dust collector.

[0029] The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A back-flushing ash cleaning device for baghouse dust collection, comprising a plurality of dust collection bags and a blow main located above the dust collection bags, characterized in that, The lower side of the main jet cleaning pipe is connected to several jet cleaning branch pipes, each corresponding to a dust collector filter bag. A linear bearing is slidably connected to the outer side of each jet cleaning branch pipe. A fixed sleeve is provided on the outer periphery of the end of each jet cleaning branch pipe and extends into the corresponding dust collector filter bag. Several connecting plates are provided at equal intervals in a ring around the axis of the jet cleaning branch pipe at the bottom of the linear bearing. The upper part of the connecting plate is hinged to the upper end of support rod one, the lower end of support rod two is hinged to the upper end of support rod two, the lower part of the connecting plate is hinged to the upper end of support rod three, the lower end of support rod three is hinged to support rod four, the upper end of support rod four is hinged to support rod two, and the lower end is hinged to the fixed sleeve. The outer sides of several support rods one and two are connected as one unit by a sealing cloth cover. The linear bearing can be close to or far from the fixed sleeve so that the sealing cloth cover can switch between an open state and a folded state.

2. The back-blowing ash cleaning device for cloth bag dust removal according to claim 1, characterized in that, Several of the linear bearings are connected as a single unit by a connecting rod.

3. The back-blowing ash cleaning device for cloth bag dust removal according to claim 2, characterized in that, The opening of the dust collector filter bag is fixed to a sealing plate, and several cylinders are provided on the upper side of the sealing plate. The piston rod end of the cylinder is fixedly connected to the connecting rod.

4. The back-blowing ash cleaning device for cloth bag dust removal according to claim 1, characterized in that, The outer periphery of the fixed sleeve is provided with an annular positioning plate, and the outer side of the annular positioning plate is provided with several slots for forming a locking structure with the lower ends of the support rod.

5. The back-flushing ash cleaning device for cloth bag dust removal according to claim 1, characterized in that, The length of the first support rod is 1 / 5 to 1 / 4 of the length of the second support rod.

6. The back blow ash cleaning device for cloth bag dust removal according to claim 1, characterized in that, The second support rod is hinged to the upper end of the fourth support rod at a distance of 1 / 4 to 1 / 3 of its own length from its upper end via a hinge shaft.

7. The back blow ash cleaning device for cloth bag dust removal according to claim 1, characterized in that, The fourth support rod is hinged to the lower end of the third support rod at a distance of 1 / 3 to 1 / 2 of its own length from the upper end via a hinge shaft.

8. The back blow ash cleaning device for cloth bag dust removal according to claim 1, characterized in that, The sealing cloth cover is made of polytetrafluoroethylene fiber cloth.

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