Environment-friendly low-emission bag-type dust collector

Abstract

The invention relates to the technical field of dust removal, in particular to an environment-friendly low-emission bag-type dust remover which comprises an air inlet pipe, a filter chamber, a filter bag, a pattern plate, an ash removal mechanism, an air purification chamber, an air outlet pipe and a bag cage, the filter chamber and the air purification chamber are arranged between the air inlet pipe and the air outlet pipe from bottom to top, the pattern plate is installed between the filter chamber and the air purification chamber, and the ash removal mechanism is arranged between the filter bag and the air purification chamber. The dust cleaning mechanism is arranged above the tubesheet, the filter bag is embedded into the tubesheet, the bag cage comprises a top hoop, a venturi tube, longitudinal bars, a support ring and a base, the top hoop is inserted into the tubesheet, the venturi tube is inserted into the top hoop, the plurality of hollow longitudinal bars are circumferentially arrayed on the inner wall of the top hoop, the support ring is nested in the longitudinal bars, the base is connected to the lower ends of the longitudinal bars, and the filter bag is embedded into the base. According to the invention, the pulse gas released by the shunt ash removal mechanism is used for pressurizing a part of gas and pressing a strong gradient to act on the lower part of the filter bag, so that the ash removal compensation of an area with a poor ash removal effect on the lower part of the filter bag is realized.

Description

Technical Field

[0001] The invention relates to the technical field of dust removal, in particular to an environmentally friendly low-emission bag dust collector. Background Art

[0002] Bag filter is a dry dust filter that can filter fine dust in the gas. It is used in the pharmaceutical, cement, metallurgy and building materials industries, and plays a pivotal role in green development. According to the cleaning method, bag filter can be divided into mechanical vibration type, backflush type and pulse jet type. Among them, pulse jet type has the best cleaning effect and is the most commonly used.

[0003] The so-called pulse jet bag filter is to arrange a nozzle above the filter bag opening, and then release pulse gas through the nozzle of the cleaning mechanism, so that the filter bag on the bag cage expands and shrinks after the pulse gas passes, thereby forming a filter bag shake to shake off the dust accumulated on the filter bag. The cleaned dust is accumulated during the filtration process of the dust collector. When the dust accumulates to a certain amount, it will hinder the gas from entering the filter bag, slow down the filtration process, and thus increase the pressure difference between the inside and outside of the filter bag, which is easy to squeeze the dust particles into the filter holes of the filter bag, causing irreversible damage to the filtration effect of the filter bag. However, a small amount of dust can help improve the filtration effect of the dust collector. This part of the dust is called the "primary layer". The "primary layer" accumulates on the outer surface of the filter bag, forming a gap smaller than the filter hole of the filter bag, and then blocking finer dust particles from entering the filter bag. Therefore, avoiding damage to the primary layer during cleaning can effectively reduce the dust emission of the dust collector in the early stage of filtration. The existing technology will perform fixed-point detection on different parts of the filter bag, and through data analysis, set the pulse gas pressure value and gas release frequency to protect the "primary layer" while cleaning. For example, a PLC-controlled bag dust collector spray cleaning control system with publication number CN117101293B adjusts the spray pressure by detecting the wind speed and dust concentration at various locations on the filter bag.

[0004] The spraying produced by the existing detection technology can effectively avoid damage to the "primary layer", but the effect of use will be affected by the length of the filter bag. The nozzle of the cleaning mechanism is fixedly set above the filter bag. The intensity of the pulse gas sprayed by the nozzle will inevitably decay with the depth of entering the filter bag. As the length of the filter bag increases, this decay becomes more obvious in the lower part of the filter bag. Correspondingly, the cleaning effect on the lower part of the filter bag will also become worse, that is, the cleaning effect of the upper and lower parts of the filter bag will be uneven, which will induce the following problems: If the "primary layer" on the top of the filter bag is protected, there will be more dust residue under the filter bag. First, because the cleaning of the lower part of the filter bag is not thorough, the cleaning process will be more frequent, which will affect the filtration of the dust collector. Efficiency, secondly, during the next filtration process, the lower part of the filter bag will accumulate more dust than the upper part, which is prone to local damage, requiring frequent replacement of the filter bag, and the fiber material of the filter bag is not an environmentally friendly material; if only the "primary layer" at the bottom of the filter bag is protected, the dust on the upper part of the filter bag will be completely removed, which will affect the filtering effect of the dust collector at the initial stage of the next filtration, resulting in increased dust emissions. Especially when dealing with gases with a large dust content, cleaning will be more frequent, and accordingly, the initial filtration of the dust collector will also occur more frequently, resulting in greater emissions from the dust collector.

[0005] In order to take into account both the environmental protection and emission of the dust collector, it is necessary to provide cleaning compensation for the lower part of the filter bag. Therefore, an environmentally friendly low-emission bag dust collector is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide an environmentally friendly low-emission bag dust collector, which solves the problem that the existing dust collector cannot clean evenly, causing the filter bags to be easily damaged or the dust emission in the initial stage of equipment filtration is high. By diverting the pulse gas released by the cleaning mechanism, a part of the gas is pressurized and acts on the lower part of the filter bag according to the pressure gradient, thereby achieving cleaning compensation for the area in the lower part of the filter bag where the cleaning effect is poor.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An environmentally friendly low-emission bag dust collector comprises an air inlet pipe, a filter chamber, a filter bag, a flower plate, a dust cleaning mechanism, a clean air chamber, an air outlet pipe and a bag cage, wherein the filter chamber and the clean air chamber are arranged between the air inlet pipe and the air outlet pipe from bottom to top, the flower plate is installed between the filter chamber and the clean air chamber, the dust cleaning mechanism is arranged above the flower plate, the filter bag is clamped on the flower plate, the bag cage comprises a top hoop, a venturi tube, longitudinal ribs, a support ring and a base, the top hoop is inserted into the flower plate, and the top hoop is pressed above the filter bag, the venturi tube is inserted into the top hoop, the number of the longitudinal ribs is multiple, and the interior of the longitudinal ribs is hollow, the multiple longitudinal ribs are arranged in a circular array on the inner wall of the top hoop, the support ring is nested in the longitudinal ribs, and the base is connected to the lower end of the longitudinal ribs.

[0009] During cleaning, the Venturi tube guides the pulse airflow released by the cleaning mechanism to the inside and outside of the longitudinal ribs respectively. The airflow inside the longitudinal ribs is pressurized and discharged from the lower part of the longitudinal ribs to intensify the expansion of the lower part of the filter bag. The airflow outside the longitudinal ribs is guided by the base and flows to the peripheral surface of the bottom of the filter bag. During filtering, the lower part of the longitudinal ribs absorbs the gas guided by the base to reduce the air pressure in the lower part of the filter bag.

[0010] Preferably, the Venturi tube includes a flange, an upper tube, a connecting wall, and a lower tube, the flange is connected to the upper end surface of the top hoop, the upper tube and the connecting wall are both connected to the bottom of the flange, the lower tube is connected to the bottom surface of the connecting wall, and the lower tube is coaxially arranged below the upper tube, the bottom surface of the connecting wall is nested in the upper end of the longitudinal rib, the lower tube is configured as a truncated cone structure, and the upper end of the lower tube is inserted into the upper tube.

[0011] Through the above scheme, the pulse gas sprayed by the cleaning mechanism is divided into two streams during cleaning: one stream passes through the inside of the lower tube and directly spreads to the inside of the filter bag; the other stream passes through the outside of the lower tube and enters the inside of the longitudinal ribs. During filtering, because the upper end of the lower tube is inserted into the upper tube, the gas flowing through the inside of the lower tube can be directly discharged from the upper tube, avoiding loss caused by overflow.

[0012] Preferably, connecting holes are provided on the bottom surface of the connecting wall, the number of the connecting holes is set to be multiple, and the connecting holes are arranged in a circular array on the periphery of the lower tube, the connecting holes include an air intake section, a connecting section, and a sealing section from top to bottom, the air intake section and the sealing section are set to be a pair of tapered holes with small diameter ends facing each other, the connecting section is located between the air intake section and the sealing section, and the connecting section wraps the upper end of the longitudinal rib.

[0013] Through the above scheme, the large diameter of the connecting section is at the top and the small diameter is at the bottom, which has an accelerating effect on the gas entering the longitudinal reinforcement. The small diameter of the sealing section is at the top and the large diameter is at the bottom, which facilitates the sealing between the longitudinal reinforcement and the connecting section, and fillers can be added in the gap or directly welded.

[0014] Preferably, the lower end of the upper tube is provided with an outer fold, through which the gas flowing down the upper tube can be guided to the periphery to avoid the gas hitting the lower tube to cause self-loss and damage the smooth curved surface of the lower tube, thereby affecting the lower tube's drainage of the gas. The taper of the outer fold is equal to that of the lower tube, and forms a channel leading to the connection hole with the outer surface of the lower tube, so that the gas can enter the longitudinal ribs more efficiently along the channel.

[0015] Preferably, the longitudinal ribs include long ribs, transition ribs and short ribs, the long ribs are arranged in a circular array on the inner wall of the top hoop, and the upper ends of the long ribs are inserted into the connecting sections, the transition ribs are connected to the lower ends of the long ribs, the short ribs are connected to the transition ribs, and the short ribs are arranged parallel to the long ribs and located on the outside of the long ribs, and the short ribs are provided with spray holes on the circumferential surface of the short ribs facing the filter bag, and the spray holes are provided in multiple rows and columns.

[0016] Through the above scheme, the gas in the longitudinal ribs is ejected from the spray holes, which can form a dust cleaning effect on the lower part of the filter bag to compensate for the attenuation of the pulse airflow passing through the lower tube. The multi-row arrangement makes the pressure of the gas ejected from the spray holes gradually weaken from bottom to top, which complements the attenuation of the pulse airflow passing through the lower tube; the multi-row arrangement enables each short rib to spray the gas inside it more widely, so as to form a more uniform dust cleaning effect on the lower part of the filter bag.

[0017] Preferably, the spray hole is set as a conical hole, and the small diameter end of the spray hole is facing the filter bag. The most direct effect is that this design can increase the air pressure when the spray hole is ejected, so as to enhance the cleaning effect on the lower part of the filter bag; in addition, it can also effectively prevent the accumulation of dust in the spray hole: only the purified pulse gas passes through the inside of the short rib, but the gas outside the short rib still has a certain dust content after being filtered by the filter bag, and the dust will settle downward due to its own gravity. The short rib is located at the lower part of the filter bag. If the spray hole is not specially designed, dust is very easy to accumulate inside the spray hole. The cleaning process is short relative to the filtering process. The long-term accumulation of dust, if coupled with a humid environment, is very likely to cause clogging of the spray hole. This design allows dust to only adhere to the small diameter end of the spray hole in a small area, and it will be easily blown out when the spray hole is pressurized and ejected.

[0018] Similar to the attenuation of the gas entering from the lower tube, the negative pressure exerted by the clean air chamber on the inside of the filter bag during filtration is also gradually weakened, that is, the filtration speed of the upper and lower parts of the filter bag is uneven. Of course, it cannot be easily assumed that there is less dust in the lower part of the filter bag and more dust in the upper part of the filter bag. In order to avoid the high cost of detection technology, the more popular method is constant pressure cleaning, that is, cleaning will be performed only when the negative pressure of the clean air chamber is lower than the set value. The reduction in the negative pressure value in the clean air chamber is due to the accumulation of dust on the outer surface of the filter bag. The more dust accumulates, the more difficult it is for the gas outside the filter bag to enter the inside of the filter bag, and the pressure difference between the inside and outside of the filter bag will gradually increase. The air pressure outside the filter bag remains unchanged, so only the air pressure inside the filter bag decreases, that is, the air pressure in the clean air chamber decreases. This results in that, although the upper part of the filter bag can filter faster and absorb more dust, the outer surface of the lower part of the filter bag does not accumulate so much dust. When the accumulation of dust on the upper part of the filter bag reaches the set value, the air pressure in the clean air chamber will not drop to the set value to start cleaning. Instead, the lower part of the filter bag continues to filter, and at the same time, the upper part of the filter bag is subjected to a large pressure difference and also performs weak filtering until the air pressure in the clean air chamber drops to the set value. In this process, the upper part of the filter bag is very likely to cause dust particles to enter the filter holes due to the large pressure difference, resulting in blockage that cannot be cleaned.

[0019] Preferably, the interior of the transition rib is sequentially arranged from the outside to the inside as an air supply section, a first valve section, an air transmission section, a second valve section and an air extraction section, the air supply section and the air transmission section are both connected with a block, the first valve section and the second valve section are respectively provided with a first valve core and a second valve core, the air supply section is connected with the short rib, the air transmission section is connected with the long rib, and the air extraction section leads to the outside of the transition rib.

[0020] Through the above scheme, the gas inside the filter bag is prevented from entering the short ribs from the spray holes during filtration, thereby avoiding the blockage of the spray holes; and the gas in the filter bag can enter the long ribs from the air extraction section during filtration, and be discharged to the clean air chamber through the venturi, thereby compensating for the filtering effect at the bottom of the filter bag during filtration.

[0021] Preferably, the base includes a chassis and a protrusion, the chassis is connected below the transition rib, the protrusion is connected above the chassis, and the protrusion is coaxially arranged with the top hoop, the protrusion is hollow inside, and the circumferential surface of the protrusion is set as an arc structure, and the lower end of the protrusion is located at the inner circle of the transition rib.

[0022] Through the above scheme, the pulse gas passing through the lower tube during cleaning can diffuse toward the peripheral surface of the filter bag under the guidance of the protrusion when reaching the lower part of the filter bag, thereby enhancing the cleaning effect on the lower part of the filter bag and buffering the impact of the gas on the base, making the connection between the bag cage and the flower plate more stable. In addition, during filtering, the air extraction section of the transition rib arranged on the chassis will extract the gas at the bottom of the bag cage, and the arrangement of the protrusion effectively prevents the phenomenon of mutual obstruction (i.e., "counter-suction" phenomenon) when the air extraction sections relative to the center of the chassis are exhausted.

[0023] Preferably, the support ring connects the upper end of the short rib and the circumference of the long rib, thereby strengthening the connection between the short rib and the long rib. The support ring is hollow inside, and the support ring is connected to the short rib, thereby avoiding the phenomenon that the air pressure inside the short rib is too high to hinder the air intake. A one-way valve is provided below the support ring, and the gas in the support ring is discharged to the bottom of the filter bag through the one-way valve, and diffuses to the circumference of the filter bag under the guidance of the protrusion to enhance the cleaning effect.

[0024] Preferably, the support ring further comprises a top ball and a partition, wherein the top ball is arranged at the upper port of the short rib inserted into the support ring, so that the top ball will be lifted only when the air pressure in the short rib reaches a set value, thereby avoiding the phenomenon that insufficient pressure inside the short rib causes insufficient pressure of the gas ejected from the spray hole, thus affecting the dust cleaning compensation effect. The partition is arranged on both sides of the top ball.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention changes the shape of the original venturi tube so that it can divide the pulse gas released by the cleaning mechanism into two streams, one of which continues the effect of the original pulse gas, and the other passes through the interior of the longitudinal ribs and is discharged at the bottom of the filter bag, thereby achieving cleaning compensation for the lower part of the filter bag, so that the cleaning effect of the upper and lower parts of the filter bag is uniform, thereby avoiding environmental problems caused by the fragility of the filter bag and the phenomenon of high dust emission in the initial stage of filtration of the dust collector.

[0027] 2. The present invention connects the long ribs and the short ribs with the help of transition ribs and support rings, thereby ensuring the connection strength between the long ribs and the short ribs. The design inside the transition ribs makes the long ribs connected to the short ribs only during cleaning, thereby ensuring that the spray holes on the short ribs will not be blocked during filtering. The support rings ensure that there is an appropriate air pressure inside the short ribs, which will neither cause the air pressure sprayed from the spray holes to be too low to affect the cleaning compensation effect on the lower part of the filter bag, nor cause the air pressure inside the short ribs to be too high, thereby causing the pulse gas energy passing through the lower pipe to be too large to damage the top of the filter bag.

[0028] 3. The present invention guides the gas propagating to the lower part of the filter bag to the peripheral surface of the filter bag through the convex blocks, which not only enhances the cleaning effect of the lower part of the filter bag, but also avoids the impact on the base, making the connection between the bag cage and the flower plate more stable. During filtering, the convex blocks can block the "counter-suction" phenomenon between the transition ribs, so that the transition ribs can better perform filtering compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0030] Figure 2 For the present invention Figure 1 A schematic diagram of the structure enlargement of part A;

[0031] Figure 3 For the present invention Figure 2 A schematic diagram of the structure of part B in the middle is enlarged;

[0032] Figure 4 For the present invention Figure 2 The enlarged schematic diagram of the structure of part C in the middle;

[0033] Figure 5 For the present invention Figure 4 The enlarged schematic diagram of the structure of part D in the middle;

[0034] Figure 6 For the present invention Figure 2 The enlarged schematic diagram of the structure of part E in the middle;

[0035] Figure 7 It is a schematic diagram of the dust cleaning state of the present invention;

[0036] Figure 8 It is a schematic diagram of the filtering state of the present invention.

[0037] In the figure: 1, air inlet pipe; 2, filter chamber; 3, filter bag; 4, flower plate; 5, dust cleaning mechanism; 6, clean air chamber; 7, air outlet pipe; 8, bag cage; 81, top hoop; 82, venturi tube; 821, flange; 822, upper pipe; 8221, outer fold; 823, connecting wall; 8231, connecting hole; 82311, air inlet section; 82312, connecting section; 82313, sealing section; 824, lower pipe; 83, longitudinal rib; 831, long rib; 832, transition rib; 8321, air supply section; 8322, first valve section; 8323, air delivery section; 8324, second valve section; 8325, air extraction section; 8326, stopper; 8327, first valve core; 8328, second valve core; 833, short rib; 8331, spray hole; 84, support ring; 841, one-way valve; 842, top ball; 843, partition; 85, base; 851, chassis; 852, bump. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] See also Figures 1 to 8 The present invention provides an environmentally friendly low-emission bag dust collector, and the technical solution is as follows:

[0040] An environmentally friendly low-emission bag filter includes an air inlet pipe 1, a filter chamber 2, a filter bag 3, a flower plate 4, a dust cleaning mechanism 5, a clean air chamber 6, an air outlet pipe 7 and a bag cage 8. The filter chamber 2 and the clean air chamber 6 are arranged between the air inlet pipe 1 and the air outlet pipe 7 from bottom to top. The flower plate 4 is installed between the filter chamber 2 and the clean air chamber 6. The dust cleaning mechanism 5 is arranged above the flower plate 4. The filter bag 3 is clamped on the flower plate 4. The bag cage 8 includes a top hoop 81, a venturi tube 82, a longitudinal rib 83, a support ring 84 and a base 85. The number of longitudinal ribs 83 is multiple, and the longitudinal ribs 83 are hollow inside. The bag cage 8 is a welded part as a whole. Before being installed in the flower plate 4, the bag cage 8 is welded first. The welding process is as follows: the venturi tube 82 is welded to the top hoop 81, and the welding points are arranged on the circumference of the flange 821. Then, multiple longitudinal ribs 83 are welded to the inner circle of the top hoop 81 in sequence. Before welding, the upper end of the longitudinal rib 83 is inserted into the venturi tube 82 to form an initial positioning of the longitudinal rib 83. After the longitudinal rib 83 is fully positioned, the longitudinal rib 83 is welded. After all the longitudinal ribs 83 are welded, the support ring 84 is first put on the multiple longitudinal rods. Multiple support rings 84 can be welded. While completing the welding, radial positioning of the multiple longitudinal rods is formed. Finally, the bottoms of the multiple longitudinal ribs 83 are welded to the base 85 in sequence. After the filter bag 3 is inserted into the flower plate 4, the bag cage 8 is inserted into the bag cage 8 in stages. The process is as follows: use auxiliary tools, such as steel rods, to insert between the longitudinal rods and place them on the flower plate 4. When the bag cage 8 is dropped, the steel rods will set up the support ring 84 to set up the bag cage 8, and then pull out the steel rods, and repeat this process until the top hoop 81 presses the upper end of the filter bag 3.

[0041] During cleaning, the venturi 82 guides the pulse airflow released by the cleaning mechanism 5 to the inside and outside of the longitudinal rib 83 respectively. The airflow inside the longitudinal rib 83 is pressurized and discharged from the lower part of the longitudinal rib 83 to intensify the expansion of the lower part of the filter bag 3. The airflow outside the longitudinal rib 83 is guided by the base 85 and flows to the peripheral surface of the bottom of the filter bag 3. During filtering, the lower part of the longitudinal rib 83 absorbs the gas guided by the base 85 to reduce the air pressure in the lower part of the filter bag 3.

[0042] As an embodiment of the present invention, refer to Figures 1 to 3The venturi tube 82 includes a flange 821, an upper tube 822, a connecting wall 823, and a lower tube 824. The flange 821 is connected to the upper end surface of the top hoop 81. The upper tube 822 and the connecting wall 823 are both connected to the bottom of the flange 821. The lower tube 824 is connected to the bottom surface of the connecting wall 823. The lower tube 824 is coaxially arranged below the upper tube 822. The lower tube 824 is configured as a truncated cone structure, and the upper end of the lower tube 824 is inserted into the upper tube 822. Through this configuration, the pulse gas can pass through the inside of the lower tube 824 and directly propagate to the inside of the filter bag 3; it can also pass through the outside of the lower tube 824 and enter the inside of the longitudinal rib 83. A connection hole 8231 is provided on the bottom surface of the connecting wall 823. The number of the connection holes 8231 is set to be multiple, and the connection holes 8231 are arranged in a circumferential array on the periphery of the lower tube 824. The connection holes 8231 include an air intake section 82311, a connecting section 82312, and a sealing section 82313 from top to bottom. The air intake section 82311 and the sealing section 82313 are set as a pair of tapered holes with small diameter ends facing each other. The large diameter of the connecting section 82312 is at the top and the small diameter is at the bottom, which has an accelerating effect on the gas entering the longitudinal rib 83. The small diameter of the sealing section 82313 is at the top and the large diameter is at the bottom, which facilitates the sealing between the longitudinal rib 83 and the connection section 82312. The connecting section 82312 is located between the air intake section 82311 and the sealing section 82313, and the connecting section 82312 wraps the upper end of the longitudinal rib 83. After the connecting section 82312 is inserted into the upper end of the longitudinal rib 83, the gap between the sealing section 82313 and the longitudinal rib 83 is welded tightly. The lower end of the upper tube 822 is provided with an outer fold 8221, through which the gas flowing down the upper tube 822 can be guided to the periphery to avoid the gas colliding with the lower tube 824 to cause self-loss and damage the smooth curved surface of the lower tube 824, thereby affecting the gas drainage of the lower tube 824. The taper of the outer fold 8221 is equal to the taper of the lower tube 824, and forms a channel leading to the connecting hole 8231 with the outer surface of the lower tube 824, so that the gas can enter the longitudinal rib 83 more efficiently along the channel.

[0043] The manufacturing process of the venturi tube 82 is as follows: the venturi tube 82 is made of aluminum alloy material throughout, and is first manufactured through a die-casting process to form an integrated flange 821 and an upper tube 822, and an integrated connecting wall 823 and a lower tube 824, and then the connecting wall 823 is welded to the bottom of the flange 821. The welding process should keep the weld tight to avoid pulse gas entering the venturi tube 82 and causing leakage. Before welding, a connecting hole 8231 should be tapped on the connecting wall 823.

[0044] As an embodiment of the present invention, refer to Figure 4 and Figure 5The longitudinal ribs 83 include long ribs 831, transition ribs 832 and short ribs 833. The long ribs 831 are arranged in a circular array on the inner wall of the top hoop 81, and the upper ends of the long ribs 831 are inserted into the connecting section 82312. The transition ribs 832 are connected to the lower ends of the long ribs 831. The short ribs 833 are connected to the transition ribs 832, and the short ribs 833 are arranged in parallel with the long ribs 831 and are located on the outside of the long ribs 831. The short ribs 833 are provided with spray holes 8331 on the circumferential surface of the filter bag 3. The gas in the longitudinal ribs 83 is sprayed out from the spray holes 8331, which can form a dust cleaning effect on the lower part of the filter bag 3 to compensate for the attenuation of the pulse airflow passing through the inside of the lower tube 824 at the lower part of the filter bag 3. The spray holes 8331 are arranged in multiple rows and columns. The multiple rows make the pressure of the gas sprayed from the spray holes 8331 gradually weaken from bottom to top, which complements the attenuation of the pulse airflow passing through the lower tube 824. The multiple columns make each short rib 833 spray the gas inside it more widely, so as to form a more uniform cleaning effect on the lower part of the filter bag 3. The spray holes 8331 are arranged as conical holes, and the small diameter end of the spray holes 8331 faces the filter bag 3. The most direct effect is that this design can increase the air pressure when the nozzle 8331 sprays air, so as to enhance the cleaning effect on the lower part of the filter bag 3; in addition, it can also effectively prevent dust from accumulating in the nozzle 8331: only the purified pulse gas passes through the interior of the short rib 833, but the gas outside the short rib 833 still has a certain dust content after being filtered by the filter bag 3, and the dust will settle downward under its own gravity, and the short rib 833 is located at the lower part of the filter bag 3. If the nozzle 8331 is not specially designed, dust is very easy to accumulate inside the nozzle 8331. The cleaning process is short relative to the filtering process. If the dust accumulates for a long time, it is very easy to cause clogging of the nozzle 8331 in a humid environment. This design allows dust to only adhere to the small diameter end of the nozzle 8331 in a small area, and it will be easily blown out when the nozzle 8331 is pressurized and sprayed. The interior of the transition rib 832 is sequentially arranged from the outside to the inside as an air supply section 8321, a first valve section 8322, an air delivery section 8323, a second valve section 8324 and an air extraction section 8325. The air supply section 8321 and the air delivery section 8323 are both connected with a block 8326. The first valve section 8322 and the second valve section 8324 are respectively provided with a first valve core 8327 and a second valve core 8328. The air supply section 8321 is connected to the short rib 833, the air delivery section 8323 is connected to the long rib 831, and the air extraction section 8325 leads to the outside of the transition rib 832. This prevents the gas inside the filter bag 3 from entering the short rib 833 from the spray hole 8331 during filtration, thereby preventing the spray hole 8331 from being blocked; and, during filtration, the gas inside the filter bag 3 can enter the long rib 831 from the air extraction section 8325 and be discharged to the clean air chamber 6 through the venturi 82, thereby compensating for the filtering effect at the bottom of the filter bag 3 during filtration.

[0045] The long rib 831, transition rib 832 and short rib 833 are welded together. Before welding, the hole inside the transition rib 832 is tapped first, and then the groove at the welding point is milled, and the first valve core 8327 and the second valve core 8328 are placed through the groove. Then, the stopper 8326 is welded to the air intake section 82311 and the air delivery section 8323 respectively, and finally, the transition rib 832 is welded to the long rib 831 and the short rib 833 respectively. For the manufacture of the spray hole 8331, the area on the short rib 833 where the spray hole 8331 is to be processed is first milled off, and then a plate with the spray hole 8331 tapped is welded to the previously milled area.

[0046] As an embodiment of the present invention, refer to Figure 2 The base 85 includes a bottom plate 851 and a projection 852. The bottom plate 851 is connected to the bottom of the transition rib 832. The projection 852 is welded to the top of the bottom plate 851. The projection 852 is coaxially arranged with the top hoop 81. The projection 852 is hollow inside. The peripheral surface of the projection 852 is set to an arc structure and can be formed by die casting. The lower end of the projection 852 is located at the inner circle of the transition rib 832.

[0047] Through the above scheme, the pulse gas passing through the lower tube 824 during cleaning can diffuse toward the peripheral surface of the filter bag 3 under the guidance of the protrusion 852 when reaching the lower part of the filter bag 3, thereby enhancing the cleaning effect on the lower part of the filter bag 3 and buffering the impact of the gas on the base 85, making the connection between the bag cage 8 and the flower plate 4 more stable. In addition, during filtering, the air extraction section 8325 of the transition rib 832 arranged on the bottom plate 851 will extract the gas at the bottom of the bag cage 8, and the arrangement of the protrusion 852 effectively prevents the phenomenon of mutual obstruction (i.e., "counter-suction" phenomenon) of the air extraction sections 8325 relative to the center of the bottom plate 851 during air extraction.

[0048] As an embodiment of the present invention, refer to Figure 6 , the support ring 84 connects the upper end of the short rib 833 with the circumference of the long rib 831, strengthening the connection between the short rib 833 and the long rib 831. The support ring 84 is hollow inside, and the support ring 84 is connected to the short rib 833, thereby avoiding the phenomenon that the air pressure inside the short rib 833 is too high to hinder the air intake. The support ring 84 includes a one-way valve 841, a top ball 842 and a partition 843. The gas in the support ring 84 is discharged to the bottom of the filter bag 3 through the one-way valve 841, and diffuses to the circumference of the filter bag 3 under the guidance of the protrusion 852 to enhance the cleaning effect. The top ball 842 is arranged at the upper port of the short rib 833 inserted into the support ring 84, so that the top ball 842 will be lifted only when the air pressure in the short rib 833 reaches the set value, thereby avoiding the phenomenon that the internal pressure of the short rib 833 is insufficient, resulting in insufficient gas pressure sprayed from the spray hole 8331, which affects the cleaning compensation effect. The partition plate 843 is welded to both sides of the top ball 842 .

[0049] Working principle: During cleaning, the pulse airflow released by the cleaning mechanism 5 is divided into two parts through the venturi 82, one of which enters the interior of the filter bag 3 along the original channel (i.e., the outside of the longitudinal rib 83), causing the filter bag 3 to shake to shake off the dust. However, as the airflow propagates to the bottom of the filter bag 3, the energy of the airflow is continuously weakened, that is, the cleaning effect of the airflow on the filter bag 3 is attenuated; and the role of the other pulse airflow is to compensate for the cleaning effect of the filter bag 3 that is poor due to the previous cause. This airflow passes through the interior of the longitudinal rib 83 and is pressurized and discharged through the nozzle 8331, and the starting point of the exhaust is at the bottom of the filter bag 3. That is to say, the cleaning compensation effect of this airflow on the top of the bottom of the filter bag 3 is gradually weakened, which is just complementary to the attenuation of the cleaning effect from top to bottom caused by the first airflow.

[0050] Specifically, in order to divide the pulse airflow released by the cleaning mechanism 5 into the two streams mentioned above, an upper tube 822, a connecting wall 823 and a lower tube 824 are arranged inside the venturi tube 82, so that the airflow can pass through the inside of the lower tube 824 (that is, pass through the outside of the longitudinal rib 83), and enter the inside of the longitudinal rib 83 from the gap between the lower tube 824 and the connecting wall 823. In order to make the latter's air intake more convenient, the outer fold 8221 of the upper tube 822 is set to have the same taper as the lower tube 824 to guide the airflow to the upper end of the longitudinal rib 83.

[0051] The airflow entering the filter bag 3 from the outside of the longitudinal ribs 83 will diffuse along the radial direction of the filter bag 3 while propagating toward the bottom of the filter bag 3, so that the filter bag 3 is shaken and cleaned. This airflow will eventually hit the base 85, and the base 85 is originally designed as a flat structure. The energy lost by the airflow collision cannot be used, and the reflected airflow will further reduce the energy of the subsequent airflow. Therefore, a convex block 852 is added to the base 85, so that when this airflow reaches the lower part of the filter bag 3, it can be guided to the peripheral surface of the filter bag 3, which not only enhances the cleaning effect of the bottom of the filter bag 3, but also avoids the impact of the airflow on the base 85, so as to ensure the overall strength of the bag cage 8.

[0052] The airflow entering the longitudinal rib 83 will be discharged through the spray hole 8331. In order to complement the attenuation of the cleaning effect of the airflow entering from the outside of the longitudinal rib 83 from top to bottom, the energy of the gas discharged through the spray hole 8331 should be gradually weakened from bottom to top. Therefore, on the basis of the long rib 831, a transition rib 832 and a short rib 833 connected to the inside of the long rib 831 are added, and the spray holes 8331 are arranged in multiple rows and columns on the short rib 833. In addition, in order to enhance the energy of the gas when it is discharged and achieve a better cleaning effect, the spray hole 8331 is set as a tapered hole with the small diameter end facing the filter bag 3. Because the internal space of the longitudinal rib 83 is limited, the internal gas is easily saturated. When the gas entering the longitudinal rib 83 is blocked, more gas will inevitably enter from the outside of the longitudinal rib 83, which will make the gas energy on the upper part of the filter bag 3 too strong, and then cause the filter bag 3 to be easily damaged locally, thereby shortening the service life. Therefore, the support ring 84 is changed from solid to hollow and connected to the upper port of the short rib 833. A one-way valve 841 for exhausting to the outside is provided below the support ring 84, so that the saturated gas in the short rib 833 is discharged to the lower part of the filter bag 3 and then discharged to the peripheral surface of the filter bag 3 under the guidance of the protrusion 852. In order to prevent the gas in the short rib 833 from being easily discharged to the support ring 84, resulting in insufficient gas pressure from the spray hole 8331, a top ball 842 is arranged on the upper port of the short rib 833 inserted into the support ring 84. Only when the air pressure in the short rib 833 reaches the set value, the top ball 842 can be lifted up to discharge the internal gas to the support ring 84.

[0053] During filtering, the air outlet pipe 7 will draw air outwards, and the gas will also pass through the above two channels during the process of flowing from the filter bag 3 to the clean air chamber 6. However, in order to ensure that the gas pressure ejected from the spray hole 8331 is sufficient during dust cleaning, the aperture of the spray hole 8331, especially the minor diameter of the spray hole 8331, is very small. Although the dust-containing gas is filtered by the filter bag 3, it still inevitably contains dust. In order to avoid clogging of the spray hole 8331, the gas in the filter bag 3 should not pass through the spray hole 8331 during filtering. Therefore, the interior of the transition rib 832 is designed as follows: the first valve section 8322 and the second valve section 8324 are located on the outside and inside of the gas transmission section 8323, respectively, and the gas transmission section 8323 is connected to the interior of the long rib 831. During dust cleaning, the long rib 831 blows air toward the air delivery section 8323, thereby blowing the first valve core 8327 toward the outside and the second valve core 8328 toward the inside, so that the gas enters the short rib 833 through the air intake section 82311; during filtering, the long rib 831 draws air toward the air delivery section 8323, thereby blowing the first valve core 8327 toward the inside and the second valve core 8328 toward the outside, so as to cut off the passage between the long rib 831 and the short rib 833, and allow the gas at the bottom of the filter bag 3 to enter the long rib 831 through the air extraction section 8325. In addition, with the help of the guiding effect of the protrusion 852, the transition rib 832 connected to the bottom plate 851 and relative to the center of the bottom plate 851 will not have the phenomenon of "opposite suction".

[0054] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly low-emission bag filter, comprising an air inlet pipe (1), a filter chamber (2), a filter bag (3), a flower plate (4), a dust cleaning mechanism (5), a clean air chamber (6) and an air outlet pipe (7), wherein the filter chamber (2) and the clean air chamber (6) are arranged from bottom to top between the air inlet pipe (1) and the air outlet pipe (7), the flower plate (4) is installed between the filter chamber (2) and the clean air chamber (6), the dust cleaning mechanism (5) is arranged above the flower plate (4), and the filter bag (3) is snap-connected to the flower plate (4), characterized in that: The bag cage (8) further comprises a bag cage (8), wherein the bag cage (8) comprises a top hoop (81), a venturi tube (82), longitudinal ribs (83), a support ring (84) and a base (85), wherein the top hoop (81) is inserted into the flower plate (4) and the top hoop (81) is pressed above the filter bag (3), the venturi tube (82) is inserted into the top hoop (81), a plurality of longitudinal ribs (83) are arranged in a circular array on the inner wall of the top hoop (81), the support ring (84) is embedded in the longitudinal ribs (83), and the interior of the longitudinal ribs (83) is hollow, and the base (85) is connected to the lower end of the longitudinal ribs (83); During cleaning, the venturi (82) guides the pulsed airflow released by the cleaning mechanism (5) to the inside and outside of the longitudinal ribs (83), respectively. The airflow inside the longitudinal ribs (83) is pressurized and discharged from the lower part of the longitudinal ribs (83), thereby intensifying the expansion of the lower part of the filter bag (3). The airflow outside the longitudinal ribs (83) is guided by the base (85) and flows to the peripheral surface of the bottom of the filter bag (3). During filtering, the lower part of the longitudinal ribs (83) absorbs the gas guided by the base (85), thereby reducing the air pressure at the lower part of the filter bag (3).

2. The environmentally friendly low-emission bag dust collector according to claim 1 is characterized by: The venturi tube (82) comprises a flange (821), an upper tube (822), a connecting wall (823), and a lower tube (824); the flange (821) is connected to the upper end surface of the top hoop (81); the upper tube (822) and the connecting wall (823) are both connected below the flange (821); the lower tube (824) is connected to the bottom surface of the connecting wall (823), and the lower tube (824) is coaxially arranged below the upper tube (822); the bottom surface of the connecting wall (823) is nested in the upper end of the longitudinal rib (83); the lower tube (824) is configured as a truncated cone structure, and the upper end of the lower tube (824) is inserted into the upper tube (822).

3. The environmentally friendly low-emission bag dust collector according to claim 2 is characterized by: A connection hole (8231) is provided on the bottom surface of the connecting wall (823), the number of the connection holes (8231) is set to be multiple, and the connection holes (8231) are arranged in a circular array on the periphery of the lower tube (824), and the connection hole (8231) includes an air intake section (82311), a connection section (82312), and a sealing section (82313) from top to bottom, and the air intake section (82311) and the sealing section (82313) are set as a pair of tapered holes with small diameter ends facing each other, and the connecting section (82312) is located between the air intake section (82311) and the sealing section (82313), and the connecting section (82312) wraps the upper end of the longitudinal rib (83).

4. The environmentally friendly low-emission bag dust collector according to claim 3 is characterized by: The lower end of the upper tube (822) is provided with an outer fold (8221), and the taper of the outer fold (8221) is equal to the taper of the lower tube (824).

5. The environmentally friendly low-emission bag dust collector according to claim 4 is characterized by: The longitudinal ribs (83) include long ribs (831), transition ribs (832) and short ribs (833); the long ribs (831) are arranged in a circular array on the inner wall of the top hoop (81), and the upper ends of the long ribs (831) are inserted into the connecting sections (82312); the transition ribs (832) are connected to the lower ends of the long ribs (831); the short ribs (833) are connected to the transition ribs (832), and the short ribs (833) are arranged in parallel with the long ribs (831) and are located on the outside of the long ribs (831); and spray holes (8331) are arranged in an array on the circumferential surface of the short ribs (833) facing the filter bag (3).

6. The environmentally friendly low-emission bag dust collector according to claim 5 is characterized by: The spray hole (8331) is configured as a conical hole, and the small diameter end of the spray hole (8331) faces the filter bag (3).

7. The environmentally friendly low-emission bag dust collector according to claim 5 is characterized by: The interior of the transition rib (832) is sequentially arranged from the outside to the inside as an air supply section (8321), a first valve section (8322), an air delivery section (8323), a second valve section (8324) and an air extraction section (8325); the air supply section (8321) and the air delivery section (8323) are both connected with a stopper (8326); the first valve section (8322) and the second valve section (8324) are respectively arranged with a first valve core (8327) and a second valve core (8328); the air supply section (8321) is connected to the short rib (833); the air delivery section (8323) is connected to the long rib (831); and the air extraction section (8325) leads to the outside of the transition rib (832).

8. The environmentally friendly low-emission bag dust collector according to claim 7 is characterized by: The base (85) comprises a bottom plate (851) and a projection (852), wherein the bottom plate (851) is connected below the transition rib (832), and the projection (852) is connected above the bottom plate (851), and the projection (852) is coaxially arranged with the top hoop (81), the projection (852) is hollow inside, and the peripheral surface of the projection (852) is arranged in an arc-shaped structure, and the lower end of the projection (852) is located at the inner circle of the transition rib (832).

9. The environmentally friendly low-emission bag dust collector according to claim 5, characterized in that: The support ring (84) connects the upper end of the short rib (833) and the circumference of the long rib (831). The support ring (84) is hollow inside and is connected to the short rib (833). A one-way valve (841) is provided below the support ring (84).

10. The environmentally friendly low-emission bag dust collector according to claim 9, characterized in that: The support ring (84) further comprises a top ball (842) and a partition (843), wherein the top ball (842) is arranged at the upper port of the short rib (833) inserted into the support ring (84), and the partition (843) is arranged on both sides of the top ball (842).

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