Longitudinal bar structure of bag cage of bag type dust collector

Abstract

A longitudinal bar structure of a bag cage of a bag type dust collector is characterized in that the bag cage is arranged in a filter bag to serve as a support framework of the filter bag, the bag cage comprises a plurality of longitudinal bars, the longitudinal bars are hollow pipes, the top ends of the longitudinal bars are connected with an external air supply blowing device, a plurality of vent holes are longitudinally and uniformly distributed on one side, close to the filter bag, of each longitudinal bar at intervals, and each vent hole is provided with a hole cover. The inner side of the hole cover is connected to the inner wall of the longitudinal rib through a spring, the hole cover shrinks inwards to be closed during filtering of the bag type dust collector and is embedded into the vent hole to shield the vent hole, and the hole cover pops outwards to be opened during dust removal of the bag type dust collector. According to the utility model, cooperative dust removal with pulse blowing can be realized, the process resistance rise of a filter material is effectively weakened, and the service life of the filter material is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of bag filters, and more specifically to a longitudinal bar structure of a bag cage of a bag filter. Background Art

[0002] A bag filter mainly includes a box body (a filter bag chamber, a clean gas chamber), a flower plate, filter bags, a bag cage, a pulse jet system, a hopper, an electric control system, etc. The bag cage of the bag filter, also known as the filter bag keel, is a key component in the bag filter to ensure the normal operation of the filter bag. It not only supports the shape of the filter bag, but also directly affects the dust removal effect, the service life of the filter bag, and the overall use efficiency.

[0003] The bag cage is mainly composed of longitudinal bars and support rings. It is required that the support rings and longitudinal bars are evenly distributed and serve as the support components of the filter bag to play a role as a skeleton. It should have sufficient strength and stiffness to keep the filter bag in a certain shape during filtration and cleaning, and prevent damage and deformation caused by collisions and impacts during normal transportation and installation. Reasonable selection and maintenance of each component of the bag cage contribute to improving the working efficiency and service life of the dust collector.

[0004] Due to the increasing application of bag filters, users' requirements for the service life of bag filters are getting higher and higher. In this regard, most current manufacturers take the measure of increasing the number of longitudinal bars of the bag cage in order to reduce the stress on the surface of the filter bag, thereby improving the service life of the filter bag. However, due to the position of the longitudinal bars, they will block the contact between the jet airflow and the filter bag. The more the number of longitudinal bars, the more the area of the jet airflow is blocked, and the larger the area of poor cleaning. The cleaning effect of the filter bag has a great relationship with the degree of deformation of the filter bag during cleaning. As the number of longitudinal bars increases, the pulse airflow is buffered by the longitudinal bars during cleaning, resulting in less force on the filter bag and a reduced degree of deformation, which will also weaken the cleaning intensity. In addition, the traditional pulse jet cleaning device of the dust collector is arranged above the filter bag. During jetting, the airflow jets from top to bottom. Due to the increased density of the longitudinal bars in the filter bag cage of the filter bag, when the airflow pressure is relatively large, the jet airflow will directly reach the bottom of the filter bag, resulting in local damage to the filter bag and other situations. Therefore, it is necessary to frequently replace the new filter bag, which not only affects the project progress and increases the cost, but also cannot really solve the problem. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a longitudinal bar structure of a bag cage of a bag filter, which can realize collaborative cleaning with pulse jetting, effectively weaken the increase in the process resistance of the filter media, and improve the service life of the filter media.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The longitudinal bar structure of a bag filter cage, the cage is arranged inside the filter bag as a support framework for the filter bag, the cage includes a number of longitudinal bars, the longitudinal bars are hollow tubes, the top of the longitudinal bars is connected to an external air supply and blowing device, and a plurality of ventilation holes are evenly distributed longitudinally and at intervals on the side of each longitudinal bar close to the filter bag. Each ventilation hole is provided with a hole cover, the inner side of the hole cover is connected to the inner wall of the longitudinal bar by a spring, the hole cover retracts and closes and is embedded in the ventilation hole to shield the ventilation hole during the filtration of the bag filter, and the hole cover pops out and opens during the dust cleaning of the bag filter.

[0008] Further, the outer diameter of the longitudinal bar is 5 mm - 9 mm, and the wall thickness thereof is 0.5 mm - 1 mm.

[0009] Further, define the side of the ventilation hole close to the filter bag as the outer side, and the side of the ventilation hole close to the inside of the longitudinal bar as the inner side. The circumferential section of the ventilation hole forms an inclined section that gradually expands from the inside to the outside.

[0010] Further, the hole cover has a thickness, and the circumferential surface of the hole cover forms a circumferential section corresponding to being embedded in the ventilation hole. The circumferential surface of the hole cover correspondingly forms an inclined circumferential surface that gradually expands from the inside to the outside.

[0011] Further, the ventilation hole is a circular through hole.

[0012] Further, the outer diameter of the ventilation hole is 3 mm - 5 mm.

[0013] Further, a spring is connected to the inner side surface of the hole cover. The front end of the spring is connected to the inner side surface of the hole cover, and the rear end of the spring is connected to the inner wall of the longitudinal bar on the side opposite to the ventilation hole.

[0014] Further, the interval between adjacent ventilation holes on the same longitudinal bar is 5 cm - 50 cm.

[0015] Further, the surfaces of the longitudinal bars and the hole covers are both coated with an anti-corrosion layer.

[0016] After adopting the above scheme, the utility model opens the hole cover during the dust cleaning operation of the bag filter by arranging ventilation holes on the longitudinal bars and setting a hole cover connected by a spring on the side of the ventilation hole close to the filter bag, and the top of the longitudinal bar is connected to an external air supply and blowing device. The air flow blows evenly towards the filter bag through the gap between the hole cover and the ventilation hole, which can assist in dust cleaning, reduce the accumulation of dust inside the filter bag, improve the dust cleaning effect, and reduce the burden on the filter bag. During the filtration operation of the bag filter, the hole cover is forced to close and shield the ventilation hole, which not only prevents the ventilation hole from being blocked by ash but also does not protrude from the longitudinal bar to cause wear to the filter bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the longitudinal bar (omitting the hole cover) adopting the utility model;

[0018] Figure 2Structural schematic diagram of the longitudinal bars (without the hole cover) of the present utility model;

[0019] Figure 3 Structural schematic diagram of the longitudinal bars of the present utility model when the hole cover at the ventilation hole is opened;

[0020] Figure 4 Structural schematic diagram of the longitudinal bars of the present utility model when the hole cover at the ventilation hole is closed;

[0021] Figure 5 Partial view (at Figure 3 A in) of the longitudinal bars of the present utility model at the ventilation hole;

[0022] Figure 6 is Figure 3 Cross-sectional view in the horizontal direction at the hole cover in.

[0023] Explanation of the reference numerals in the drawings:

[0024] 10 Cage; 1 Longitudinal bar; 11 Ventilation hole; 12 Hole cover; 13 Spring; 2 Support ring. Detailed implementation manners

[0025] In order to further explain the technical solution of the present utility model, the following will elaborate on the present utility model in detail through specific embodiments.

[0026] As Figure 1 shown, the cage 10 of the bag filter is provided inside the filter bag as a support skeleton for the filter bag. The cage 10 is formed by enclosing a plurality of longitudinal bars 1 and is connected and composed by the support rings 2. The longitudinal bars 1 are evenly distributed around the circumference of the support ring 2. The filter bag (not shown in the figure) is sleeved outside the cage 10. Since the filter bag will be subjected to a large airflow impact during the filtration and dust cleaning processes, the cage 10 as its skeleton needs to have good strength and provide sufficient support to improve the service life of the filter bag.

[0027] The present utility model makes improvements on the longitudinal bars 1 of the cage 10. First, the longitudinal bars 1 are made into hollow tubes, and then refer to Figures 2 to 6As shown, a plurality of ventilation holes 11 are longitudinally and evenly distributed at intervals on one side of each longitudinal bar 1 close to the filter bag. Each ventilation hole 11 is provided with a hole cover 12. The inner sides of the hole covers 12 are connected by springs 13. The inner side surface of the hole cover 12 is connected to the spring 13, and the other end of the spring 13 is connected to the inner wall of the longitudinal bar. With the telescopic elasticity of the spring 13, the hole cover 12 can be retracted and closed and embedded in the ventilation hole 11 to shield the ventilation hole 11 during the filtration of the bag filter (when the hole cover 12 is subjected to the gas pressure from outside to inside, it is pressed inward into the ventilation hole 11). The top of the hollow pipe of the longitudinal bar 1 is connected to an external air supply and blowing device (not shown in the figure). The hole cover 12 pops out and opens during the dust cleaning of the bag filter (the spring 13 pops out outward under the gas pressure from inside to outside, driving the hole cover to pop out), and the air flow can jet evenly from the edge of the hole cover.

[0028] In this embodiment, the longitudinal bar 1 is a high-strength steel hollow pipe. Air can pass through the inside of the longitudinal bar 1. During dust cleaning, the top of the longitudinal bar 1 can receive the blowing air flow. The air flow direction is from the cage to the filter material and is discharged through the ventilation hole 11. The hole cover 12 pops out, and the air flow jets evenly from the edge of the hole cover 12, which can perform synchronous and uniform dust cleaning with the pulse system, and the dust cleaning effect is better. Preferably, the outer diameter of the longitudinal bar 1 can be 5 mm - 9 mm, and its wall thickness is 0.5 mm - 1 mm.

[0029] In order to prevent the cage 10 from being eroded and extend its service life, in this embodiment, an anti-corrosion layer is coated on the surface of the longitudinal bar 1 and the surface of the hole cover 12.

[0030] The ventilation hole 11 can be directly formed as a circular through hole on the pipe wall. Since the pipe wall has a certain thickness, the side of the ventilation hole 11 close to the filter bag is defined as the outer side, and the side of the ventilation hole 11 close to the inside of the longitudinal bar is defined as the inner side. The circumferential section of the ventilation hole 11 forms an inclined section that gradually expands from inside to outside. On this basis, the ventilation hole 11 section has a larger outer diameter and a smaller inner diameter, and the preferred outer diameter range is 3 mm - 5 mm. To enable the hole cover 12 to be completely embedded and shield the ventilation hole 11, and have a better effect of preventing the ventilation hole 11 from being blocked by ash, the hole cover 12 is also shaped corresponding to the ventilation hole 11 and is provided with a certain thickness. Specifically, the circumferential surface of the hole cover 12 forms a circumferential section corresponding to being embedded in the ventilation hole 11, and the circumferential surface of the hole cover correspondingly forms an inclined circumferential surface that gradually expands from inside to outside. In this way, the hole cover 12 can be completely embedded in the ventilation hole 11, which can not only prevent the ventilation hole 11 from being blocked by ash but also not protrude from the longitudinal bar 1 to cause wear to the filter bag. Within the above size range, preferably, on the same longitudinal bar 1, the interval between adjacent ventilation holes 11 is 5 cm - 50 cm.

[0031] Preferably, the outer diameter of the longitudinal bar 1 can be 7 mm, the wall thickness is 1 mm, and the outer diameter of the ventilation hole 11 section can be 3 mm, and the inner diameter of the ventilation hole 11 section can be 2.5 mm.

[0032] Further refer to Figures 3 - 5 In this embodiment, each hole cover 12 is connected by a spring. The front end of the spring 13 is connected to the inner side surface of the hole cover 12, and the rear end of the spring 13 is connected to the inner wall of the longitudinal rib on the side opposite to the ventilation hole 11.

[0033] After adopting the above structure, when the bag filter is working, the top of the hollow pipe of the longitudinal rib 1 is connected to the external air supply and spraying device. When pulse cleaning is not carried out, the air flow direction is from the filter material to the cage. At this time, the hole cover 12 is closed. The hole cover 12 can be forced to close under the action of the normal air flow, completely embedded in and covering the ventilation hole 11, forming a coincidence with the longitudinal rib, which not only prevents the ventilation hole 11 from being blocked by ash, but also does not protrude from the longitudinal rib 1 to cause wear to the filter bag, and improves the service life of the filter bag. When pulse cleaning is carried out, the air flow direction is from the cage to the filter material. The air flow will apply force outward through the ventilation hole 11 on the longitudinal rib 1, and the hole cover 12 will pop out. The air flow jets evenly from the edge of the hole cover 12, and can carry out synchronous and uniform cleaning with the pulse system for auxiliary cleaning, reduce the resistance during the operation of the filter material, reduce the accumulation of dust inside the filter material, and improve the cleaning effect.

[0034] The above is only one embodiment of the present invention, and it is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A longitudinal rib structure of a bag cage of a bag filter, the bag cage is arranged inside the filter bag as a supporting frame of the filter bag, the bag cage includes a plurality of longitudinal ribs, and is characterized in that: The longitudinal rib is a hollow tube, and the top of the longitudinal rib is connected to an external air supply blowing device. Each longitudinal rib is provided with a plurality of ventilation holes evenly distributed longitudinally on the side close to the filter bag. Each ventilation hole is provided with a hole cover, and the inner side of the hole cover is connected to the inner wall of the longitudinal rib through a spring. When the bag dust collector is filtering, the hole cover shrinks and closes and is embedded in the ventilation hole to cover the ventilation hole. When the bag dust collector is cleaning, the hole cover pops outward and opens.

2. The longitudinal rib structure of a bag cage of a bag filter according to claim 1, characterized in that: The outer diameter of the longitudinal rib is 5mm-9mm, and the wall thickness is 0.5mm-1mm.

3. The longitudinal rib structure of a bag cage of a bag filter according to claim 1, characterized in that: The side of the vent hole close to the filter bag is defined as the outer side, and the side of the vent hole close to the inside of the longitudinal rib is defined as the inner side. The circumferential section of the vent hole forms an inclined section that gradually expands from the inside to the outside.

4. The longitudinal rib structure of a bag cage of a bag filter according to claim 3, characterized in that: The hole cover has a thickness, and the circumferential surface of the hole cover forms a circumferential section corresponding to the embedded vent hole, and the circumferential surface of the hole cover correspondingly forms an inclined circumferential surface that gradually expands from the inside to the outside.

5. The longitudinal rib structure of a bag cage of a bag filter according to claim 3, characterized in that: The vent hole is a circular through hole.

6. The longitudinal rib structure of a bag cage of a bag filter according to claim 5, characterized in that: The outer diameter of the vent hole is 3mm-5mm.

7. The longitudinal rib structure of a bag cage of a bag filter according to claim 3, characterized in that: The inner side of the hole cover is connected with a spring, the front end of the spring is connected to the inner side of the hole cover, and the rear end of the spring is connected to the inner wall of the longitudinal rib on the opposite side of the vent hole.

8. The longitudinal rib structure of a bag cage of a bag filter according to claim 6, characterized in that: The interval between adjacent ventilation holes on the same longitudinal rib is 5cm-50cm.

9. The longitudinal rib structure of a bag cage of a bag filter according to claim 1, characterized in that: The surface of the longitudinal reinforcement and the surface of the hole cover are coated with an anti-corrosion layer.

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