Metal filter bag and bag type dust collector

Abstract

The present application relates to a metal filter bag and a bag dust collector, wherein the metal filter bag comprises a bag body made of metal material, a cleaning brush and a driving part arranged in the bag body; a cover plate is sealed at the top of the bag body, and a central axis is arranged in the bag body along its axial direction; the length of the cleaning brush matches the length of the bag body; the driving part comprises a driving member and a bracket, one end of the bracket can rotate around the central axis, and the other end of the bracket is connected to the cleaning brush, and the bracket can drive the cleaning brush to rotate in contact with the inner surface of the bag body under the action of the driving member. The metal filter bag can be effectively cleaned online to ensure that the bag dust collector can operate stably and efficiently.

Description

Technical Field

[0001] The present application relates to the technical field of dust removal equipment, and in particular to a metal filter bag and a bag dust collector. Background Art

[0002] Bag dust collectors have been widely promoted and used because they are not affected by dust characteristics, have the advantages of efficiently capturing full-size particles, high capture efficiency, and long-term stable low emissions.

[0003] Nowadays, in the chemical, metallurgical, building materials, glass and other industries, high-temperature dusty flue gas is often produced, and the temperature is usually above 260°C. According to the process requirements, these dusty flue gases need to be dedusted under high-temperature conditions. The performance of traditional cloth fiber filter bags can no longer meet the requirements of flue gas conditions. Metal filter bags came into being and developed rapidly, greatly expanding the application field of bag dust collectors in high-temperature dust removal.

[0004] In the prior art, for conventional cloth fiber filter bags, two online cleaning methods are usually used: pulse valve spraying compressed air cleaning and mechanical vibration cleaning. As for metal filter bags, since metal filter bags are made of metal fibers through sintering and layering processes, they are relatively strong, hard and strong. Therefore, mechanical vibration cleaning can easily damage the filter bags. During pulse cleaning, compressed air is sprayed toward the filter bag opening through timed control of the pulse valve, and the filter bag is instantly deflated, deformed, and the dust on the surface of the filter bag falls off. This is also not suitable for cleaning metal filter bags.

[0005] Therefore, for bag dust collectors using metal filter bags, how to perform effective online dust cleaning operations to ensure that the bag dust collectors can operate stably and efficiently is a technical problem that technical personnel in this field need to solve. Summary of the invention

[0006] The purpose of the present application is to provide a metal filter bag and a bag dust collector, which can perform effective online dust cleaning operations on the metal filter bag to ensure that the bag dust collector can operate stably and efficiently.

[0007] In order to solve the above-mentioned technical problems, the present application provides a metal filter bag, comprising a bag body made of metal, a cleaning brush and a driving part arranged in the bag body; the top end of the bag body is sealed with a cover plate, and the bag body is provided with a central axis along its axial direction; the length of the cleaning brush is adapted to the length of the bag body; the driving part comprises a driving member and a bracket, one end of the bracket can rotate around the central axis, the other end of the bracket is connected to the cleaning brush, and the bracket can drive the cleaning brush to rotate in contact with the inner surface of the bag body under the action of the driving member.

[0008] A driving part is arranged inside the metal filter bag, which drives the bracket to rotate around the central axis through the driving part, and drives the cleaning brush to rotate in contact with the inner surface of the bag body. During this process, the cleaning brush can rub against the inner surface of the bag body and sweep away the dust deposited on the inner surface of the bag body, so that the dust is separated from the inner surface of the bag body, thereby avoiding blockage of the bag body, reducing the resistance of the metal filter bag, and ensuring that the bag dust collector can operate stably for a long time.

[0009] Optionally, it also includes an inner cylinder arranged in the bag body, the inner cylinder is coaxial with the central axis, and an annular support is connected between the outer wall of the inner cylinder and the inner wall of the bag body, and the side wall of the inner cylinder is evenly arranged with through holes; the inner cylinder has a segmented structure, and the bracket can pass through the gap between two adjacent sections of the inner cylinder.

[0010] Optionally, the opening rate of the inner tube is 40% to 50%.

[0011] Optionally, the cleaning brush is a metal brush, and the inner cylinder is a metal cylinder.

[0012] Optionally, the driving member includes a sleeve and blades evenly arranged along the outer circumference of the sleeve, the central axis is relatively fixed to the bag body, the sleeve is rotatably mounted outside the central axis, the bracket is connected to the outer wall of the sleeve and can rotate with the sleeve, and the blades can drive the sleeve to rotate under the impact of airflow.

[0013] Optionally, the driving member further comprises a guide vane which is arranged in an axial spiral along the central axis, the guide vane is arranged at the opening end of the sleeve facing the bag body, and the spiral direction of the guide vane is the same as the spiral direction of the blade.

[0014] Optionally, when the number of the driving members is at least two groups, the guide vane is a segmented structure, and a sleeve is provided between two adjacent segments of the guide vane.

[0015] Optionally, the top end of the central shaft is fixed to the cover plate, and / or the bottom end of the central shaft is relatively fixed to the bottom end of the bag body via a connecting rod.

[0016] Optionally, there are at least two cleaning brushes, which are evenly spaced apart along the periphery of the central axis.

[0017] The present invention also provides a bag dust collector, comprising an outer shell and the metal filter bag as described above; a flower plate is provided in the outer shell, and the space in the outer shell is divided into an upper chamber and a lower chamber arranged up and down, an air outlet is provided at the top of the upper chamber, an ash hopper is provided at the bottom of the lower chamber, and an air inlet is provided on the side wall of the lower chamber; the flower plate is provided with a flower plate hole, the metal filter bag is located in the upper chamber, and the open end of the metal filter bag is arranged downward and fixed to the flower plate, the aperture of the open end is the same as the aperture of the flower plate hole, and is coaxially arranged with the flower plate hole.

[0018] The technical effect of the bag dust collector with the metal filter bag as described above is similar to the technical effect of the above-mentioned metal filter bag. In order to save space, it will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the internal structure of the bag filter provided in the embodiment of the present application;

[0020] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the metal filter bag;

[0021] Figure 3 yes Figure 2 Sectional view of AA in the middle;

[0022] Figure 4 yes Figure 2 Schematic diagram of the structure of the middle inner tube in the expanded state.

[0023] Attached Figure 1-Figure 4 In the figure, the reference numerals are described as follows:

[0024] 100-metal filter bag, 200-housing, 210-upper chamber, 220-air outlet, 230-lower chamber, 240-ash hopper, 241-ash outlet, 250-air inlet, 260-flower plate, 261-flower plate hole;

[0025] 1-bag body, 11-opening end;

[0026] 2-Cleaning brush;

[0027] 31- bracket, 32- driving member, 321- blade, 322- sleeve, 323- guide vane;

[0028] 4-Central axis;

[0029] 5-cover plate;

[0030] 6-inner cylinder, 61 through holes;

[0031] 7- Ring support. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0033] The present application embodiment provides a metal filter bag and a bag dust collector, wherein: Figure 1 As shown, the bag dust collector includes a metal filter bag 100 and a shell 200, and a flower plate 260 is provided in the shell 200. The flower plate 260 can divide the space in the shell 200 into an upper chamber 210 and a lower chamber 230. The upper chamber 210 is located above the lower chamber 230, and an air outlet 220 is provided at the top of the upper chamber 210, and an air inlet 250 is provided on the side wall of the lower chamber 230. An ash hopper 240 is provided at the bottom end of the lower chamber 230, and an ash discharge port 241 is provided at the bottom end of the ash hopper 240. The metal filter bag 100 is located in the upper chamber 210.

[0034] The flower plate 260 is provided with a flower plate hole 261, and the metal filter bag 100 is in an inverted state. Specifically, the open end 11 of the metal filter bag 100 is arranged downward and fixed to the flower plate 260. The aperture of the open end 11 is the same as the aperture of the flower plate hole 261, and is coaxially arranged with the flower plate hole 261. That is, the flower plate hole 261 connects the upper chamber 210 and the lower chamber 230. The metal filter bag 100 is located in the upper chamber 210 and is connected to the flower plate hole 261. The dust-containing gas entering the lower chamber 230 from the air inlet 250 passes through the flower plate hole 261 and, after being filtered by the metal filter bag 100, enters the clean area of ​​the upper chamber 210 (that is, the area where the upper chamber 210 is located outside the metal filter bag 100), and is finally discharged from the air outlet 220.

[0035] The metal filter bag 100 can filter the dust-containing gas in the lower chamber 230. After the gas is filtered, dust will accumulate on the inner surface of the metal filter bag 100. In order to ensure the dust removal effect of the metal filter bag 100 and the stable and efficient operation of the bag dust collector, it is necessary to clean the inner surface of the metal filter bag 100 so that the dust on the inner surface of the metal filter bag 100 falls and falls into the ash hopper 240 through the flower plate holes 261, and is finally discharged from the ash discharge port 241 at the bottom of the ash hopper 240.

[0036] In the prior art, the cleaning of filter bags is mainly aimed at the cleaning of conventional cloth fiber filter bags, which specifically include two online cleaning methods: pulse valve blowing compressed air or mechanical vibration. However, due to the great structural strength of the metal filter bag 100, mechanical vibration can easily cause damage to the filter bag, and the pulse valve blowing compressed air requires the filter bag to produce instantaneous bulging and deformation, which can easily cause damage to the metal filter bag 100. For this reason, in this embodiment, a metal filter bag 100 is provided, which can effectively realize online cleaning without causing damage to the metal filter bag 100, thereby ensuring that the bag dust collector can operate stably and efficiently.

[0037] Specifically, Figure 2 As shown, the metal filter bag 100 includes a bag body 1 and a cleaning brush 2 and a driving part arranged in the bag body 1, wherein the bag body 1 is made of metal material, specifically metal fiber (such as carbon steel, stainless steel and other metal materials), and a cylindrical structure made by sintering and lamination processes, with large strength, hardness and firmness. A cover plate 5 is provided at the top of the bag body 1 for sealing, and an open end 11 is formed at the bottom end of the bag body 1. The length of the cleaning brush 2 is adapted to the length of the bag body 1, and the cleaning brush 2 is fitted to the inner surface of the bag body 1.

[0038] A central axis 4 is provided in the bag body 1 along its axial direction, and the driving part includes a driving member 32 and a bracket 31, wherein one end of the bracket 31 can rotate around the central axis 4, and the other end of the bracket 31 is connected to the cleaning brush 2, that is, the bracket 31 can drive the cleaning brush 2 to rotate around the central axis 4. Specifically, the driving member 32 is used to drive the bracket 31 to rotate around the central axis 4. Since the cleaning brush 2 can fit the inner surface of the bag body 1 during the rotation, the driving member 32 can drive the cleaning brush 2 to clean the inner wall of the bag body 1 during the process of driving the bracket 31 to rotate.

[0039] That is to say, a driving unit is arranged inside the metal filter bag 100, and the driving member 32 drives the bracket 31 to rotate around the central axis 4, and drives the cleaning brush 2 to rotate in contact with the inner surface of the bag body 1. During this process, the cleaning brush 2 can rub against the inner surface of the bag body 1, and clean the dust deposited on the inner surface of the bag body 1, so that the dust is separated from the inner surface of the bag body 1, thereby avoiding blockage of the bag body 1, reducing the resistance of the metal filter bag 100, and ensuring that the bag dust collector can operate stably for a long time.

[0040] Since the bag body 1 is made of metal and has high strength, the cleaning brush 2 contacts and rubs against the inner surface of the bag body 1 to clean it without causing damage to the bag body 1 .

[0041] like Figure 2 As shown, the metal filter bag 100 further includes an inner cylinder 6 disposed in the bag body 1, the inner cylinder 6 is coaxially arranged with the central axis 4, and an annular support member 7 is connected between the outer wall of the inner cylinder 6 and the inner wall of the bag body 1, the annular support member 7 can provide support for the bag body 1, avoid wrinkles in the bag body 1, and avoid deformation of the bag body 1 due to the impact of airflow, thereby improving the service life of the metal filter bag 100. Specifically, along the height direction, the number of annular support members 7 is not limited, and can be one or at least two and can be arranged at intervals.

[0042] The side wall of the inner cylinder 6 is evenly provided with through holes 61 (such as Figure 4As shown in the figure, specifically, the through holes 61 are evenly arranged to even out the airflow direction. Specifically, the opening rate of the inner cylinder 6 is approximately 40% to 50%, so as to facilitate ventilation while ensuring the structural strength and pre-dust removal effect of the inner cylinder 6. The dust-containing gas entering the metal filter bag 100 from the opening end 11 first passes through the inner cylinder 6, and some dust particles with larger particles will directly collide with the inner wall of the inner cylinder 6 and fall along the inner wall of the inner cylinder 6, thereby playing a role in pre-dust removal and reducing the load of the bag body 1. Then, the dust-containing gas passes through the through holes 61 and is finally intercepted by the bag body 1.

[0043] The inner cylinder 6 is a segmented structure, and the bracket 31 can pass through the gap between the inner cylinders 6 at two adjacent ends and rotate around the central axis 4 in the gap. In this way, the inner cylinder 6 will not affect the rotation of the bracket 31. Specifically, there is no restriction on the fixing method of each segment of the inner cylinder 6. For example, the inner cylinder 6 can be fixed to the cover plate 5, fixed to the flower plate 260, or the inner cylinder 6 can be fixed to the bag body 1 only through the annular support member 7.

[0044] In this embodiment, the inner cylinder 6 is a metal cylinder, specifically a metal thin steel plate (in the unfolded state as shown in FIG. Figure 4 As shown in the figure, the inner cylinder 6 and the cleaning brush 2 are rolled into a cylinder with a wall thickness of about 1mm to 2mm. The cleaning brush 2 is a metal brush, that is, the inner cylinder 6 and the cleaning brush 2 are both made of metal. Since the bag body 1 is made of metal, it can be used in harsh working conditions such as high temperature. When the inner cylinder 6 and the cleaning brush 2 are both made of metal, they can also be used in harsh environments such as high temperature, thereby improving the overall service life of the metal filter bag 100.

[0045] like Figure 2 and Figure 3 As shown, in this embodiment, the driving member 32 includes a sleeve 322 and blades 321 arranged along the outer periphery of the sleeve 322. The number of blades 321 is at least three and is evenly arranged along the outer periphery of the sleeve 322. The sleeve 322 is sleeved outside the central axis 4 and can rotate around the central axis 4. Specifically, a gap is left between the inner wall of the sleeve 322 and the outer wall of the central axis 4 so that the sleeve 322 can rotate flexibly relative to the central axis 4. At this time, the central axis 4 is relatively fixed to the bag body 1, the bracket 31 is connected to the outer wall of the sleeve 322, and can rotate with the sleeve 322. The blades 321 can drive the sleeve 322 under the action of the airflow to rotate around the central axis 4.

[0046] That is, when the dust-laden gas enters the metal filter bag 100 from bottom to top, the airflow impacts the blade 321, which can drive the blade 321 to drive the sleeve 322 to rotate. At this time, the sleeve 322 can drive the bracket 31 and the cleaning brush 2 to rotate together, and clean the inner surface of the bag body 1. The blade 321 has a certain angle. When the airflow passes through, the blade 321 can be blown by the airflow like a windmill to drive the sleeve 322 to rotate. Specifically, how to set the angle of the blade 321 so that it can drive the sleeve 322 to rotate under the impact of the airflow is already a well-known prior art for those skilled in the art, and will not be repeated here to save space.

[0047] Of course, in this embodiment, there is no restriction on the specific structure of the driving member 32. For example, it can also be set as a motor provided on the cover plate 5, and the central shaft 4 can be driven by the motor to rotate, and the bracket 31 can be connected to the central shaft 4. When the driving member 32 is set as a structure including a sleeve 322 and a blade 321, no external power is required, which reduces energy consumption and reduces the amount of inspection and maintenance. In addition, in the process of filtering the dust-containing gas, real-time dust cleaning operation can be achieved, that is, the metal filter bag 100 can be automatically cleaned in real time during the dust removal process, thereby ensuring that the bag filter can operate stably for a long time.

[0048] The central axis 4 is relatively fixed to the bag body 1. There is no restriction on the fixing method of the central axis 4. For example, the top end of the central axis 4 can be fixed to the cover plate 5, and the bottom end is free. Alternatively, the bottom end of the central axis 4 is relatively fixed to the bag body 1 through a connecting rod, such as the connecting rod is fixed to the flower plate 260, the inner tube 6, or the bag body 1, while the top end of the central axis 4 is free. Alternatively, in order to ensure the stability of the central axis 4, the top end and the bottom end of the central axis 4 can be relatively fixed to the bag body 1 respectively.

[0049] Further, such as Figure 2 As shown, the driving member 32 further includes a guide plate 323 disposed on the outer wall of the central shaft 4, the guide plate 323 is spirally disposed along the axial direction of the central shaft 4, and the guide plate 323 is disposed at the opening end 11 of the sleeve 322 facing the bag body 1, and the spiral direction of the guide plate 323 is the same as the spiral direction of the blade 321. The guide plate 323 can provide a backflow effect on the airflow, so that the airflow can flow along the guide plate 323 to the blade 321, and act on the blade 321 so that the blade 321 drives the sleeve 322 to rotate, thereby increasing the rotation speed of the sleeve 322.

[0050] In this embodiment, only one set of driving members 32 may be provided, and the sleeve 322 may be driven to rotate by a set of blades 321, and then the cleaning brush 2 may be driven to rotate by the bracket 31, so as to clean the inner surface of the bag body 1. Alternatively, it may be as follows Figure 2As shown, two groups of driving members 32 are provided, and the two groups of driving members 32 are spaced apart in the height direction. The blades 321 of the two groups of driving members 32 are arranged in exactly the same manner, thereby synchronously driving the cleaning brush 2 to rotate, and the above-mentioned guide vanes 323 are provided between the sleeves 322 of the two groups of driving members 32 and from the sleeve 322 located below to the bottom end of the central axis 4. That is to say, the guide vanes 323 are of a segmented structure, and there is a sleeve 322 between two adjacent sections of the guide vanes 323.

[0051] The guide plate 323 can effectively guide the gas into the blade 321. The airflow carrying dust moves upward from the lower spiral. Through the principle of swirl, it concentrates on flushing the surface of the angled blade 321. Under the action of the impact force, the blade 321 drives the sleeve 322 to rotate at a high speed. A part of the airflow disperses to the periphery. The large dust particles hit the inner wall of the inner tube 6 and fall off quickly. The fine dust particles pass through the through holes 61 on the inner tube 6 and are intercepted on the inner surface of the bag body 1. Another part of the airflow passes through the blade 321, continues to enter and acts on the next group of blades 321 to rotate, so that the airflow is evenly distributed on the inner surface of the entire bag body 1.

[0052] In this embodiment, there are at least two cleaning brushes 2 , which are symmetrically arranged in the bag body 1 along the radial direction. Such an arrangement can better balance the force applied to the driving member 32 .

[0053] The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A metal filter bag, characterized in that: It comprises a bag body (1) made of metal material, and a cleaning brush (2) and a driving unit arranged in the bag body (1); The top end of the bag body (1) is sealed with a cover plate (5), and a central axis (4) is provided inside the bag body (1) along its axial direction; The length of the cleaning brush (2) is adapted to the length of the bag body (1); The driving part comprises a driving member (32) and a bracket (31); one end of the bracket (31) is capable of rotating around the central axis (4); the other end of the bracket (31) is connected to the cleaning brush (2); and the bracket (31) is capable of driving the cleaning brush (2) to rotate in contact with the inner surface of the bag body (1) under the action of the driving member (32); It also includes an inner cylinder (6) disposed in the bag body (1), the inner cylinder (6) being coaxial with the central axis (4), an annular support member (7) being connected between the outer wall of the inner cylinder (6) and the inner wall of the bag body (1), and through holes (61) being evenly arranged on the side wall of the inner cylinder (6); The inner cylinder (6) has a segmented structure, and the bracket (31) is capable of passing through the gap between two adjacent segments of the inner cylinder (6).

2. The metal filter bag according to claim 1, characterized in that: The opening rate of the inner tube (6) is 40% to 50%.

3. The metal filter bag according to claim 1, characterized in that: The cleaning brush (2) is a metal brush, and the inner cylinder (6) is a metal cylinder.

4. The metal filter bag according to any one of claims 1 to 3, characterized in that: The driving member (32) comprises a sleeve (322) and blades (321) uniformly arranged along the outer circumference of the sleeve (322); the central axis (4) and the bag body (1) are relatively fixed; the sleeve (322) is rotatably sleeved outside the central axis (4); the bracket (31) is connected to the outer wall of the sleeve (322) and can rotate with the sleeve (322); and the blades (321) can drive the sleeve (322) to rotate under the impact of airflow.

5. The metal filter bag according to claim 4, characterized in that: The driving member (32) further comprises a guide plate (323) which is arranged in an axial spiral direction along the central axis (4); the guide plate (323) is arranged at the opening end (11) of the sleeve (322) facing the bag body (1); and the spiral direction of the guide plate (323) is the same as the spiral direction of the blade (321).

6. The metal filter bag according to claim 5, characterized in that: When the number of the driving members (32) is at least two groups, the guide vanes (323) are of a segmented structure, and a sleeve (322) is provided between two adjacent segments of the guide vanes (323).

7. The metal filter bag according to claim 4, characterized in that: The top end of the central shaft (4) is fixed to the cover plate (5), and / or the bottom end of the central shaft (4) is relatively fixed to the bottom end of the bag body (1) via a connecting rod.

8. The metal filter bag according to any one of claims 1 to 3, characterized in that: The number of the cleaning brushes (2) is at least two, and they are evenly spaced along the periphery of the central axis (4).

9. A bag dust collector, characterized in that: It comprises a housing (200) and a metal filter bag as claimed in any one of claims 1 to 8; A flower plate (260) is provided in the shell (200), and the space in the shell (200) is divided into an upper chamber (210) and a lower chamber (230) arranged one above the other; an air outlet (220) is provided at the top of the upper chamber (210), an ash hopper (240) is provided at the bottom of the lower chamber (230), and an air inlet (250) is provided on the side wall of the lower chamber (230); The flower plate (260) is provided with a flower plate hole (261), the metal filter bag is located in the upper chamber (210), and the open end (11) of the metal filter bag is arranged downward and is fixed to the flower plate (260), the aperture of the open end (11) is the same as the aperture of the flower plate hole (261), and is coaxially arranged with the flower plate hole (261).

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