Bag cage with flow guide function

Abstract

The utility model discloses a bag cage with a flow guide function, which belongs to the technical field of flue gas purification equipment and comprises a support plate. A filter cylinder is arranged at the bottom of the supporting plate, a plurality of flow guide rings with conical cylinder structures are arranged in the filter cylinder, each flow guide ring adopts a big-end-down opening form, and the size of the upper opening of each flow guide ring is sequentially reduced from top to bottom in the height direction of the filter cylinder, so that more uniform air flow distribution is favorably formed; the device effectively solves the problems of poor flow guide function, low local blowing air pressure, incomplete ash removal and the like in the prior art, not only improves the filtering effect, but also prolongs the service life of the filter bag.

Description

Technical Field

[0001] The utility model relates to a cage with a flow guiding function, belonging to the technical field of flue gas purification equipment. Background Art

[0002] In the existing engineering technology, whether it is a bag filter or other composite purification equipment containing filter bags, the widely used filter bag types are circular or elliptical. The inside of the filter bag needs to be supported, and the support frame is made of steel bars in the form of a cylindrical skeleton.

[0003] For example, in a Chinese patent with the publication number CN212017113U and the name of a combined cage device, the device includes a cage skeleton and a Venturi tube extending into the inner cavity of the cage skeleton; the Venturi tube includes an end face fixedly connected to the upper end of the cage skeleton, a tapered tube section, a throat diameter, and a diffuser tube section; the end face, the tapered tube section, the throat diameter, and the diffuser tube section are connected in sequence; the end face is provided with a plurality of ventilation holes with an equivalent diameter of 3 mm to 9 mm; the opening rate of the end face is between 5% and 15%. Using a filter bag sleeved on this combined cage device to treat flue gas can not only solve the problems of significant reduction in the effective filtration area of the filter bag and obvious increase in the operating resistance of the dust collector caused by the Venturi tube extending into the inner cavity of the cage skeleton, but also prevent the upper section of the filter bag from being damaged relatively quickly when the filter bag is pulse-jet cleaned, thereby extending the service life of the filter bag. However, this device still has the problem that the support structure in the filter bag is only made of round steel in the form of an annular skeleton, and the support structure strength is insufficient, and it is easy to deform during transportation and installation, thereby affecting the shape retention ability and filtration performance of the filter bag.

[0004] For example, in a Chinese patent with the publication number CN 211799486U and the name of a rotary kiln head and tail dust collection device, the device includes a box-type bag filter, and a plurality of cages and dust removal filter bags are arranged in the box-type bag filter. The cage includes a circular base and a bag cap. A plurality of vertical ribs are evenly distributed in a ring between the base and the bag cap. The two ends of the vertical ribs are respectively welded and fixed to the base and the bag cap. A plurality of equally spaced fixing rings are arranged in the length direction of the vertical ribs. The outer ring of the fixing ring is welded and fixedly connected to each vertical rib. The fixing ring part between adjacent vertical ribs is recessed inward into an arc shape; a flow guiding pipe is welded and fixed to the bag cap, and the inner diameter of the flow guiding pipe is communicated with the inner diameter of the fixing ring. This device effectively increases the effective filtration area compared with the traditional annular structure, and a flow guiding pipe is arranged at the bag cap opening, which can improve the use area of the filter bag and reduce the resistance of the dust collector. However, although a flow guiding pipe is arranged at the bag cap opening in this device, this design does not fully consider the air flow distribution problem within the entire length range of the filter bag. Especially in the bottom area of the filter bag, there is still a problem of uneven jetting, resulting in problems such as excessive local stress on the filter bag or incomplete dust cleaning. Summary of the Invention

[0005] In order to solve the problems of poor support effect and poor diversion effect existing in the prior art.

[0006] The technical solution of the present utility model is as follows:

[0007] The present invention discloses a cage with a diversion function, including a support plate; a filter cartridge is arranged at the bottom of the support plate; a plurality of diversion rings in a conical cylinder structure are arranged along the height direction inside the filter cartridge, the diversion rings adopt an opening form with a smaller upper part and a larger lower part, and the upper opening size of each diversion ring decreases sequentially from top to bottom along the height direction of the filter cartridge.

[0008] Further, the diversion ring includes a top diversion ring and a bottom diversion ring; the bottom diversion ring adopts a design with an upper opening and a closed lower part, and its lower end is sealed by a flow equalizing plate in a form of evenly distributed sieve holes.

[0009] Further, the diversion ring further includes one or more groups of middle diversion rings located between the top diversion ring and the bottom diversion ring.

[0010] Further, a filter bag covering the filter cartridge is also arranged at the bottom of the support plate.

[0011] Further, the lower end rings of the diversion rings serve as the inner horizontal rib rings of the filter cartridge and jointly form the support structure inside the filter cartridge with the vertical round steel bars.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The cage with a diversion function provided by the present utility model is internally provided with a plurality of diversion rings. These diversion rings can not only serve as part of the support frame to enhance the strength of the support structure inside the filter bag, making the entire support frame more stable and not easily deformed during transportation and installation, thereby improving the overall stability and reliability.

[0014] The cage with a diversion function of the present utility model can make the pulsed air source act evenly on the entire filter bag during pulsed air source blowing, thereby ensuring uniform force on the filtering surface of the filter bag. Similarly, under pulsed air source blowing, it can make the blowing gas more effectively backflush the filtering surface of the filter bag, achieving a better dust cleaning effect and significantly improving the cleanliness and filtering efficiency of the filter bag.

[0015] The cage with a diversion function of the present utility model is closed at the lower end of the lowermost diversion ring by a flow equalizing plate. This design can effectively relieve the air source blowing pressure at the bottom of the filter bag, not only protecting the bottom of the filter bag from excessive impact, but also playing a good dust cleaning role, prolonging the service life of the filter bag and reducing the maintenance cost. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of a cage with a flow guiding function structure;

[0017] Figure 2 It is a schematic diagram of a flow equalizing plate;

[0018] Figure 3 It is a schematic diagram of the cage filtering flue gas;

[0019] Figure 4 It is a schematic diagram of the reverse jet of the cage.

[0020] The reference numerals in the figure are represented as:

[0021] 1. Filter cartridge; 2. Vertical round steel bar; 3. Flow guiding ring; 3-1. Top flow guiding ring; 3-2. Middle flow guiding ring A; 3-3. Middle flow guiding ring B; 3-4. Bottom flow guiding ring; 4. Flow equalizing plate; 5. Support plate. Specific embodiments

[0022] The following will combine the drawings and specific embodiments to elaborate on the present invention in detail.

[0023] See Figures 1 to 4 , the present invention provides a cage with a flow guiding function. The cage includes a support plate 5 located at the top for fixing the entire cage structure and connecting with an external frame; a filter cartridge 1 is arranged at the bottom of the support plate 5, and a plurality of flow guiding rings 3 in a conical cylinder structure are arranged inside the filter cartridge 1. The flow guiding rings 3 adopt an opening form with a smaller upper part and a larger lower part, and the upper opening sizes of the flow guiding rings 3 from top to bottom decrease sequentially along the height direction of the filter cartridge 1. Such a design helps to form a more uniform air flow distribution;

[0024] Specifically, the flow guiding ring 3 includes a top flow guiding ring 3-1, a middle flow guiding ring A 3-2, a middle flow guiding ring B 3-3, and a bottom flow guiding ring 3-4. These flow guiding rings 3 are made of thin steel materials or can also be flexible materials. They can not only enhance the strength of the internal support structure of the filter bag as part of the support frame, but also effectively guide the air flow through reasonable spacing arrangement and opening size design, improve the suction force and the filtering effect.

[0025] In the present invention, the bottom flow guiding ring 3-4 adopts a design with an upper opening and a closed lower part, and its lower end is sealed by a flow equalizing plate 4 with a uniformly distributed sieve hole type. This design can effectively relieve the air source jet pressure at the bottom of the filter bag, protect the bottom of the filter bag from excessive impact, and at the same time play a good ash cleaning role, extending the service life of the filter bag;

[0026] In the present utility model, the lower end rings of the respective flow guiding rings 3 serve as the inner horizontal rib rings of the filter cartridge 1 and form a support structure inside the filter cartridge 1 together with the vertical round steel bars 2, ensuring the stability of the filter cartridge 1 during use;

[0027] In the present utility model, a filter bag wrapping the filter cartridge 1 is further provided at the bottom of the support plate 5. The material of the filter bag is usually selected as synthetic fiber or glass fiber with high temperature resistance and corrosion resistance. During the process of the filter bag filtering flue gas, the dusty flue gas separates the dust outside through the outer surface of the filter bag under the suction of the fan, and the clean flue gas flows into the interior of the filter bag and is led out from the filter bag opening provided at the support plate. At this time, an inverted "V" - shaped space with independent sub - regions is formed between the filter cartridge 1 and the flow guiding ring 3, and this space can generate a stronger suction force, enhancing the filtering ability; when cleaning the ash by reverse pulse air injection, the air flow flows from the filter bag opening at the support plate 5 to the bottom of the filter bag where the flow - equalizing plate 4 is installed. After the pulsed air flow passes through the top flow guiding ring 3 - 1, the middle flow guiding ring A 3 - 2, the middle flow guiding ring B 3 - 3, and the bottom flow guiding ring 3 - 4 in sequence, it gradually acts evenly inside the filter cartridge 1, blowing the dust on the outer surface of the filter bag outward. The air flow reaching the bottom acts evenly on the bottom of the filter cartridge 1 under the diversion of the flow - equalizing plate 4, blowing off the dust.

[0028] Among them, both the middle flow guiding ring A 3 - 2 and the middle flow guiding ring B 3 - 3 are variant forms of the middle flow guiding ring.

[0029] Through the above design, the cage with flow - guiding function provided by the present utility model can effectively solve the problems existing in the prior art, such as uneven air injection, excessive local air injection pressure impacting the filter bag, and insufficient ash cleaning due to small local air injection pressure. It not only improves the filtering effect but also extends the service life of the filter bag.

[0030] The working principle of the present utility model:

[0031] When the dusty flue gas enters the cage, the dust is separated outside through the outer surface of the filter bag, and the clean flue gas passes through the interior of the filter bag and is led out from the filter bag opening provided at the support plate. The inverted "V" - shaped space with independent sub - regions formed between the filter cartridge 1 and the flow guiding ring 3 can generate a stronger suction force, thereby enhancing the filtering ability. The special design of the flow guiding ring 3 (the upper - small - lower - large opening form) helps to form a more uniform air flow distribution and improve the filtering efficiency.

[0032] When cleaning the dust by reverse pulse air source injection, the air flow flows from the mouth of the filter bag to the bottom of the filter bag equipped with the flow equalizing plate 4. The injection air flow passes through the top guide ring 3-1, the middle guide ring A 3-2, the middle guide ring B 3-3, and the bottom guide ring 3-4 in sequence, and gradually acts evenly on the inside of the filter cartridge 1, blowing off the dust on the outer surface of the filter cartridge 1 outward. The air flow reaching the bottom acts evenly on the bottom of the filter cartridge 1 under the diversion of the flow equalizing plate 4 at the lower end of the bottom guide ring 3-4, ensuring that the injection air flow is evenly distributed within the entire length range of the filter bag, and avoiding excessive or too small local injection air pressure from affecting the dust cleaning effect.

[0033] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitution or change, and should be covered within the protection scope of the present invention.

Claims

1. A cage with a flow guiding function, characterized in that, It includes a support plate (5); a filter cartridge (1) is provided at the bottom of the support plate (5); a plurality of flow guiding rings (3) in a conical cylinder structure are arranged inside the filter cartridge (1) along its height direction. The flow guiding rings (3) are in an opening form with a smaller upper part and a larger lower part, and the upper opening size of each flow guiding ring (3) decreases sequentially from top to bottom along the height direction of the filter cartridge (1); the flow guiding ring (3) includes a top flow guiding ring (3-1) and a bottom flow guiding ring (3-4); the bottom flow guiding ring (3-4) is designed with an upper opening and a closed lower part, and its lower end is sealed by a flow equalizing plate (4) with a uniformly distributed sieve hole pattern.

2. The cage with a flow guiding function according to claim 1, wherein The flow guiding ring (3) further includes more than one set of middle flow guiding rings located between the top flow guiding ring (3-1) and the bottom flow guiding ring (3-4).

3. The cage with a flow guiding function according to claim 1, wherein A filter bag for wrapping the filter cartridge (1) is further provided at the bottom of the support plate (5).

4. The cage with a flow guiding function according to claim 1, wherein The lower end rings of the flow guiding rings (3) serve as the inner transverse rib rings of the filter cartridge (1) and together with the vertical round steel bars (2) form the support structure inside the filter cartridge (1).

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