A top air inlet spiral guide bag type dust collector

Abstract

The present application relates to a kind of top air inlet helical flow guide bag type dust collector, including dust removal box, the lower end of dust removal box is connected with dust collection bin, there is clean gas chamber and vacuum dust removal chamber in dust removal box, clean gas chamber is connected with variable frequency vacuum assembly, dust-laden airflow generating tube is equipped in the middle part of clean gas chamber, dust-laden airflow generating tube is connected with air inlet hole and variable frequency feeding assembly, and variable frequency feeding assembly is used to transport dust to dust-laden airflow generating tube;Filter is arranged inside vacuum dust removal chamber, and gradually tapered helical flow guide is vertically arranged in the inside of vacuum dust removal chamber, and the top of gradually tapered helical flow guide is open and is communicated with the bottom of dust-laden airflow generating tube.Utilize vacuum feeding mode to reduce energy consumption, and dust-laden airflow is more evenly distributed after passing gradually tapered helical flow guide, pre-dust removal is carried out to dust-laden airflow by gradually tapered helical flow guide before reaching the outer surface of filter bag, effectively reduce operating resistance and filter bag burden;It can also be convenient to detect filter bag filtering performance and ash removal performance.

Description

TECHNICAL FIELD

[0002] The present application relates to a top air inlet spiral flow guide bag type dust collector. BACKGROUND

[0004] As one of the high-efficiency dust removal methods, the bag type dust removal mainly relies on the filtration of the fiber layer filter material on the airflow to purify the dust-containing airflow and capture the particles. Due to its high efficiency, large processing capacity, simple structure and stable operation, it has been more and more widely used. However, there are still some problems in the actual use of the bag type dust collector, mainly as follows: first, the energy consumption is too large. The main flow feeding mode of the bag type dust collector is the lower feeding, and the dust needs to move from bottom to top under the action of external force to overcome the action of gravity, which increases the energy consumption of the induced draft fan, and the lower air inlet mode is easy to cause the secondary dust raising phenomenon in the dust collection bin. In addition, the dust collector does not involve the pretreatment of the dust-containing airflow, and all the dust-containing airflow needs to be treated by the filter bag; second, the airflow distribution is uneven. The airflow guide device in the bag type dust collector is mainly the uniform distribution plate, and the uniform distribution effect is poor. The flow direction is single, and the treatment gas flow of each filter bag is greatly different; third, the airflow streamline trajectory in the bag type dust collector is relatively complex, and there are many zigzag bends, which is easy to cause airflow turbulence and increase the resistance and energy consumption of the dust collector.

[0005] In addition, the detection of the performance of the filter bag of the bag type dust collector mainly focuses on the test of the performance of the filter material used in the bag type dust collector. There are few tests on the performance of the filter bag. The two main performance indicators of the filter material are the filtration efficiency and the resistance. However, the filter bag made by further processing of the filter material is actually used in the bag type dust collector. Therefore, the comprehensive performance of the bag type dust collector cannot be represented by the single filter material test, and the performance of the filter bag should be detected with the bag type dust collector as the carrier. In addition, the detection of the performance of the filter bag mainly focuses on the filtration performance detection. The detection of the dust cleaning performance of the filter bag mainly focuses on the change of the resistance before and after the dust cleaning. The dust cleaning effect of the filter bag can be truly reflected by combining the surface vibration stress and deformation of the filter bag. SUMMARY

[0007] The present application improves the above-mentioned problems in the prior art, that is, the technical problem to be solved by the present application is to provide a top air inlet spiral flow guide bag type dust collector, which is reasonable in design, optimizes the airflow distribution, and reduces the operating resistance and energy consumption of the dust collector.

[0008] In order to achieve the above object, the technical scheme adopted by the present application is: a top air inlet spiral flow guide bag type dust collector, comprising a dust removal box body provided with a filter inside, a dust collection bin connected to the lower end of the dust removal box body, an air inlet hole provided at the top of the dust removal box body, a clean air chamber and a vacuum dust removal chamber distributed above and below in the dust removal box body via a flower plate, the clean air chamber being connected with a variable frequency vacuum pumping assembly, a dust-laden air flow generating pipe being vertically provided in the middle of the clean air chamber, the dust-laden air flow generating pipe being connected with the air inlet hole and a variable frequency feeding assembly, the variable frequency feeding assembly being used for feeding dust into the dust-laden air flow generating pipe; the filter being provided inside the vacuum dust removal chamber, a tapered spiral flow guide being vertically provided inside the vacuum dust removal chamber with the top and bottom being open, the top of the tapered spiral flow guide being communicated with the bottom of the dust-laden air flow generating pipe, flow channels being distributed along the spiral direction on the side of the tapered spiral flow guide to facilitate the outward dispersion of the dust-laden air flow and the contact of the dust-laden air flow with the filter.

[0009] Further, the tapered spiral flow guide comprises a plurality of arc-shaped blades, the plurality of arc-shaped blades being connected together along the vertical direction and forming a spiral shape, the diameters of the plurality of arc-shaped blades decreasing in turn from top to bottom according to an arithmetic progression, and the flow channels being formed between adjacent two arc-shaped blades.

[0010] Further, the distance between adjacent two arc-shaped blades increases from top to bottom in an arithmetic progression.

[0011] Further, the tapered spiral flow guide is fixed at the uppermost central position of the vacuum dust removal chamber through a support and a movable bolt; a transparent observation window which can be opened outward is provided on the side of the dust removal box body, and the transparent observation window corresponds to the position of the tapered spiral flow guide.

[0012] Further, the variable frequency vacuum pumping assembly comprises an air outlet pipe connected with the clean air chamber, and the air outlet pipe is connected with a variable frequency suction type vacuum generator.

[0013] Further, an outlet dust concentration detector and an electronic flow meter are mounted on the air outlet pipe; an inlet dust concentration detector is mounted on the dust-laden air flow generating pipe.

[0014] Further, a pulse jet dust cleaning assembly is further included, the pulse jet dust cleaning assembly comprising a connected air compressor and a gas pocket, the output end of the gas pocket being connected with a pulse delivery pipe extending into the clean air chamber, a plurality of nozzles being provided at the bottom of one end of the pulse delivery pipe inside the clean air chamber, and the plurality of nozzles corresponding to the positions of a plurality of flower plate holes on the flower plate; the filter is a plurality of filters, and the plurality of filters correspond to the positions of the plurality of flower plate holes on the flower plate.

[0015] Further, the filter element is a filter bag, and the surface of the filter bag is arranged with the vibration acceleration sensor and the filter bag wall peak pressure sensor in equal intervals from top to bottom.

[0016] Further, the plurality of flower plate holes on the flower plate are arranged in a circle outward from the dust-containing airflow generating pipe as the center.

[0017] Further, the differential pressure detection assembly is arranged on the flower plate and is arranged in equal intervals on the upper and lower sides of the pressure measuring hole.

[0018] Compared with the prior art, the present application has the following effects: the present application is reasonable in design, can reduce energy consumption by using a vacuum feeding method, and can effectively reduce the running resistance and the burden of the filter bag by pre-removing dust through the tapered spiral flow guide before the dust-containing airflow reaches the outer surface of the filter bag, and the distribution of the dust-containing airflow is more uniform after passing through the tapered spiral flow guide; and the filter performance and the dust removal performance of the filter bag can be conveniently detected. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a front view structural schematic diagram of an embodiment of the present application;

[0021] Figure 2 is a three-dimensional structural schematic diagram of the tapered spiral flow guide in the embodiment of the present application;

[0022] Figure 3 is a surface velocity nephogram obtained by using a computational fluid software in the embodiment of the present application when there are 2 filter bags;

[0023] Figure 4 is a surface velocity nephogram obtained by using a computational fluid software in the embodiment of the present application when there are 32 filter bags;

[0024] Figure 5 is a position distribution diagram of three measuring points of an inlet dust concentration tester in the reliability test in the embodiment of the present application;

[0025] Figure 6 is a position diagram of 2 filter bags in the embodiment of the present application;

[0026] Figure 7 is a schematic diagram of the uniform divergence of the dust-containing airflow to the directions of the surrounding filter bags after the dust-containing airflow passes through the tapered spiral flow guide in the embodiment of the present application;

[0027] Figure 8 is a position distribution diagram of all measuring points in the filter performance and dust removal performance detection experiment in the embodiment of the present application;

[0028] Figure 9 is a data diagram of the filter resistance in the filter performance and dust removal performance detection experiment in the embodiment of the present application.

[0029] In the drawings:

[0030] 1 - dust removal box; 2 - transparent observation window; 3 - filter bag; 4 - dust collection bin; 5 - variable frequency suction type vacuum generator; 6 - variable frequency feeding assembly; 7 - flower plate; 8 - pulse conveying pipe; 9 - gas pocket; 10 - clean gas chamber; 11 - differential pressure detection assembly; 12 - surface vibration acceleration sensor; 13 - filter bag wall peak pressure sensor; 14 - air compressor; 15 - tapered spiral flow guide; 16 - electronic flow meter; 17 - inlet dust concentration detector; 18 - vacuum dust removal chamber; 19 - dust-containing airflow generating pipe; 20 - air outlet pipe; 21 - outlet dust concentration detector; 22 - arc blade; 23 - data collector. DETAILED DESCRIPTION:

[0032] The application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0033] In the description of the present application, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0034] As Figures 1-2As shown, the top air inlet spiral flow guide bag type dust collector of the present application comprises a dust removal box body 1 internally provided with a filter element, the filter element being a filter bag 3, the lower end of the dust removal box body 1 being connected with a dust collection bin 4, the top of the dust removal box body 1 being provided with an air inlet hole, the inside of the dust removal box body 1 being divided into an upper and lower distributed clean gas chamber 10 and a vacuum dust removal chamber 18 via a flower plate 7, the clean gas chamber 10 being connected with a variable frequency vacuum pumping assembly, the variable frequency vacuum pumping assembly forming a vacuum environment for the clean gas chamber and the vacuum dust removal chamber; a dust-containing gas flow generating pipe 19 is vertically arranged in the middle of the clean gas chamber 10, the dust-containing gas flow generating pipe 19 being connected with the air inlet hole and a variable frequency feeding assembly 6, the variable frequency feeding assembly 6 being used for feeding dust into the dust-containing gas flow generating pipe, the gas flow entering from the top air inlet hole being fully mixed with the dust in the dust-containing gas flow generating pipe to form a dust-containing gas flow, the dust-containing gas flow being autonomously introduced into the vacuum dust removal chamber under the action of air pressure without the need of an additional air blower; the filter element is arranged inside the vacuum dust removal chamber 18, the vacuum dust removal chamber being connected with the dust collection bin, the inside of the vacuum dust removal chamber 18 being vertically provided with a tapered spiral flow guide 15 with the top and bottom being open, the filter element being located outside the tapered spiral flow guide, the top of the tapered spiral flow guide 15 being connected with the bottom of the dust-containing gas flow generating pipe 19, the circumferential side of the tapered spiral flow guide 15 being provided with flow-through grooves in the spiral direction for the dust-containing gas flow to diverge outward and contact the filter element. The vacuum feeding mode can reduce energy consumption, and the dust-containing gas flow is more uniformly distributed after passing through the tapered spiral flow guide, the dust-containing gas flow is pre-cleaned by the tapered spiral flow guide before reaching the outer surface of the filter bag, thereby effectively reducing the operating resistance and the burden of the filter bag; meanwhile, the filter bag filtering performance and ash removal performance can be conveniently detected.

[0035] In the embodiment, the variable frequency feeding assembly 6 is used for feeding the required dust into the dust-containing gas flow generating pipe. The variable frequency feeding assembly can comprise a hopper for placing the dust, the discharge end of the hopper being connected with a variable frequency conveying auger to facilitate the pumping of the dust.

[0036] In the embodiment, the tapered spiral flow guide 15 comprises a plurality of arc-shaped blades 22, the plurality of arc-shaped blades 22 being vertically spliced together and integrally formed into a spiral shape, the plurality of arc-shaped blades having different diameters, the diameters of the plurality of arc-shaped blades 22 decreasing in an arithmetic progression from top to bottom, the tolerance being adjustable according to the gas volume, and a flow-through groove being formed between adjacent two arc-shaped blades. It should be noted that the contraction angle of the arc-shaped blades can be adjusted according to the actual gas volume.

[0037] In this embodiment, the distance between the two adjacent arc-shaped blades 22 increases from top to bottom in an arithmetic progression, so that the dust-containing air flow entering from the top of the dust-containing air flow generating pipe 19 can be evenly dispersed in the upper and lower parts of the vacuum dust removal chamber, avoiding the concentration of dust-containing air flow in the upper part of the vacuum dust removal chamber, causing the lower air flow to be short-circuited, and a part of the dust will be deposited on the arc-shaped blades 22 in the process, which is a pre-dust removal process for the dust-containing air flow.

[0038] In this embodiment, the tapered spiral flow guide 15 is fixed at the uppermost center position of the vacuum dust removal chamber 18 by a support and a movable bolt; the peripheral side of the dust removal box body 1 is provided with a transparent observation window 2 which can be opened outward, and the transparent observation window 2 corresponds to the position of the tapered spiral flow guide 15. Preferably, the transparent observation window is made of PVC material. When in use, the tapered spiral flow guide can be taken out after opening the transparent observation window and removing the movable bolt, so as to achieve the purpose of removing the accumulated dust on the arc-shaped blades 22.

[0039] In this embodiment, the transparent observation window 2 can be located on any one of the four sides of the vacuum dust removal chamber 18 of the dust removal box body, so that the working state of the system can be observed in real time, and the system can be immediately stopped for maintenance when an abnormality occurs. At the same time, the tapered spiral flow guide 15 can be taken out for cleaning by opening the window.

[0040] In this embodiment, the variable frequency vacuum pumping assembly includes an air outlet pipe 20 connected to the clean gas chamber 10, and the air outlet pipe 20 is connected to the variable frequency suction type vacuum generator 5. Preferably, the variable frequency suction type vacuum generator 5 can adopt a variable frequency vacuum pump. When in use, the variable frequency suction type vacuum generator 5 continuously pumps the inside of the dust removal box body 1 to form a vacuum state, under the action of pressure, the air flow enters the dust-containing gas generating pipe through the air inlet hole at the top of the system, the variable frequency feeding assembly quantitatively supplies the required dust to the dust-containing air flow generating pipe, and the air flow and the dust are fully and uniformly mixed in the pipe to form a stable dust-containing air flow. Since the dust removal space is in a vacuum state, the dust-containing gas can enter the vacuum dust removal chamber by itself under the joint action of gravity and pressure, and it is no longer necessary to use auxiliary equipment such as a blower to make it enter the vacuum dust removal chamber; part of the large particle dust enters the vacuum dust removal chamber and directly falls to the dust collection bin under the action of gravity, which is equivalent to pre-dust removal.

[0041] In this embodiment, it also includes a pulse jet dust cleaning assembly, which includes a connected air compressor 14 and a gas pocket 9, the output end of the gas pocket 9 is connected with a pulse delivery pipe 8 extending into the inside of the clean gas chamber 10, and the end of the pulse delivery pipe 8 located in the clean gas chamber is provided with a plurality of nozzles at the bottom, and the plurality of nozzles correspond to the positions of the plurality of flower plate holes on the flower plate 7; the filter is a plurality of, and the plurality of filters correspond to the positions of the plurality of flower plate holes on the flower plate, and the air flow processed by each filter bag 3 is uniform.

[0042] In the embodiment, the dust-containing airflow generating pipe 19 is provided with an inlet dust concentration detector 17. Specifically, the sampling probe of the inlet dust concentration detector 17 is positioned at the measuring hole of the dust-containing airflow generating pipe 19. The air outlet pipe 20 is provided with an outlet dust concentration detector 21 and an electronic flowmeter 16. Specifically, the sampling probe of the outlet dust concentration detector is positioned at the measuring hole of the air outlet pipe. The dust concentration at the inlet and the dust concentration at the outlet are calculated to obtain the filtration efficiency of the system, and the electronic flowmeter measures the gas flow.

[0043] In the embodiment, the surface of the filter bag 3 is provided with a vibration acceleration sensor 12 and a filter bag wall peak pressure sensor 13 from top to bottom at equal intervals. The vibration acceleration sensor is used to detect the maximum acceleration of the vibration of the filter bag surface at the instant of blowing. The filter bag wall peak pressure sensor is used to detect the maximum pressure on the filter bag surface at the instant of blowing, so as to realize the detection of the dynamic ash removal performance. It should be noted that, in order to ensure air tightness, glass glue is used to seal all the positions where the sensors are installed. The vibration acceleration sensor on the surface of the filter bag and the filter bag wall peak pressure sensor are uniformly and equidistantly installed on the outer surface of the filter bag, so as to realize the detection of the ash removal performance of the filter bag. The change of the acceleration and pressure of the filter bag surface at the instant of blowing is detected to reflect the ash removal effect between different filter bags. The data sampling line is connected to the collector through the hole opened in the side wall of the dust removal box.

[0044] In the embodiment, a differential pressure detection assembly 11 is further included. The differential pressure detection assembly 11 is connected to the pressure measuring holes equidistantly arranged on the upper and lower sides of the flower plate 7 through the pressure measuring guide air pipe, and is used to detect the real-time resistance change of the dust remover.

[0045] In the embodiment, the plurality of flower plate holes on the flower plate 7 are circularly arranged outward from the center of the dust-containing airflow generating pipe, so as to ensure that the dust-containing gas can reach each filter bag after flowing through the tapered spiral flow guide, the gas flow processed by the filter bag is uniform, and the position of the nozzle on the pulse blowing ash removal assembly strictly corresponds to and matches the center of the flower plate hole.

[0046] In the embodiment, the electronic flowmeter 16, the inlet dust concentration detector 17, the outlet dust concentration detector 21, the differential pressure detection assembly 11, the filter bag surface vibration acceleration sensor 12, and the filter bag wall peak pressure sensor 13 form a detection system to realize the detection of the filter bag filtration performance and the more comprehensive ash removal performance detection. Further, the inlet dust concentration detector 17, the outlet dust concentration detector 21, the electronic flowmeter 16, and the differential pressure detection assembly 11 can realize 24-hour uninterrupted dynamic real-time detection.

[0047] In the embodiment, the dust-containing airflow generating pipe and the air outlet pipe are both circular pipes. The dust-containing airflow generating pipe is welded to the central reserved circular hole of the flower plate through the clean gas chamber.

[0048] In this embodiment, the specific installation process is as follows: the upper part of the vacuum dust removal chamber 18 of the dust removal box body 1 is connected with the screen plate 7, the dust-containing gas generating pipe 19 is welded with the center of the screen plate 7 through the clean gas chamber 10, the tapered spiral flow guide 15 is communicated with the bottom of the dust-containing gas generating pipe 19, one side of the dust removal box body 1 is provided with a rotating transparent observation window 2, the variable frequency feeding assembly 6 is above the clean gas chamber, and is used for providing the dust-containing gas generating pipe 19 with required dust; the air outlet pipeline 20 is connected with the variable frequency suction type vacuum generator 5, the sampling probe position of the inlet dust concentration detector 17 is on the measuring hole of the air inlet pipeline, the sampling probe position of the outlet dust concentration detector 21 is on the measuring hole of the air outlet pipeline 20, the electronic flow meter 16 is installed on the air outlet pipeline, the screen plate up-down pressure difference detection assembly 11 is connected with the measuring holes arranged on the upper and lower sides of the screen plate 7 through the pressure measuring pipe, and the filter bag 3 is arranged with the filter bag surface vibration acceleration sensor 12 and the filter bag wall peak pressure sensor 13 from the upper surface to the lower surface.

[0049] The working principle of the application is as follows:

[0050] (1) The variable frequency feeding assembly 6 is located at the upper part of the system, and is used for conveying required dust into the dust-containing gas generating pipe 19, so that the dust and gas are fully mixed to form dust-containing gas. The dust-containing gas enters the dust remover from the pipeline, passes through the tapered spiral flow guide 15, and part of the dust directly settles into the dust collection bin under the action of speed and inertia, so that pre-dust removal is realized. Meanwhile, part of the dust will stay on the arc-shaped blades 22 of the tapered spiral flow guide 15 when the dust-containing gas flows through the tapered spiral flow guide, so that double pre-dust removal and energy consumption reduction are realized. When the arc-shaped blades 22 of the tapered spiral flow guide 15 are deposited with too much dust, the arc-shaped blades 22 can be disassembled and taken out from the transparent observation window. The remaining dust diffuses to the filter bag area in a water wave form under the action of the airflow and is filtered. The filtering process of the filter bag can be observed through the transparent observation window.

[0051] (2) The airflow flow trace is simpler, and the flow distance is shorter. The arrangement form of the screen plate holes on the screen plate 7 is a circular array, the gas treatment capacity of each filter bag is the same, and the defects of the ordinary bag-type dust remover, such as more airflow bending, airflow confusion, poor effect of the existing gas distribution device and easy airflow short circuit, are overcome. The processed airflow flows out of the screen plate holes, is collected in the clean gas chamber, and is finally discharged from the air outlet pipeline. When the filtering resistance of the running filter bag reaches the set value, the control system sends a command, the pulse blowing and cleaning assembly starts to work, the pulse blowing valve is opened, the gas in the gas pocket is discharged, the blowing and cleaning is performed, the surface cake layer of the filter bag is caused to fall off due to the deformation of the filter bag and is caused to settle into the dust collection bin under the action of gravity, the cleaning process of the filter bag can be observed through the transparent observation window, and the accumulated dust in the dust collection bin can be discharged through the unloading port at the bottom of the dust collection bin.

[0052] (3) Throughout the process, the entrance dust concentration detector enters the dust-containing airflow to detect the concentration in real time; the outlet dust concentration detector detects the concentration of the exhaust gas in the outlet pipeline in real time, and the filtration efficiency of the filter bag can be calculated according to the inlet and outlet dust concentrations; an electronic flowmeter is installed on the outlet pipeline to detect the flow change and ensure the constant flow of the entire system; the differential pressure detection assembly is used to detect the real-time resistance change of the dust collector; acceleration sensors and bag wall peak pressure sensors are arranged on the surface of the filter bag from top to bottom to detect the maximum acceleration and peak pressure at the instant of blowing during the cleaning process, and to detect the deformation of the filter bag during the cleaning process in real time, so as to comprehensively evaluate the cleaning performance of the filter bag from multiple angles.

[0053] In order to verify the uniformity and stability of the airflow distribution of the system, simulation calculation is performed on the system containing 2 filter bags, and the surface velocity cloud diagram of the 2 filter bags is obtained as shown in Figure 2 The results show that the surface velocity of the 2 filter bags is relatively uniform, and the difference in surface velocity is small, so it can be considered that the amount of gas processed by each filter bag is uniform. In order to make the results more representative, the system containing 32 filter bags is simulated and calculated, and the surface velocity cloud diagram of the 32 filter bags is obtained as shown in Figure 4 Through comparison with 2 filter bags, it can be found that the uniformity effect of 32 filter bags is good, and the amount of gas processed by each filter bag is the same, which fully reflects that the airflow is more uniform in the system with multiple filter bags. In summary, it can be concluded that the amount of gas processed by the filter bags in the system is uniform and has excellent scalability.

[0054] Example 1, feeding mode reliability test:

[0055] Turn on the variable frequency suction type vacuum generator, confirm that the filtration air speed reaches 1 m / min and maintains stable through the electronic flowmeter, add experimental dust meeting the VDI test standard in the hopper of the variable frequency feeding assembly, the positions of the three inlet dust concentration detectors are used to detect the inlet dust concentrations at different positions, and whether the dust can be mixed with clean air to form a stable dust-containing airflow without the aid of a blower and other equipment is judged by comparing the dust concentrations at different positions. The position distribution of the three measuring points is as shown in Figure 5 The data collector is used to collect the dust concentrations of the three measuring points, and the test results are as follows.

[0056]

[0057] According to the results, the concentration values of the three measuring points are small, it can be considered that the concentration of the dust-containing gas in the generating pipe is stable, which shows that the top feeding mode is stable and reliable, and has the effect of uniform dispersion of dust without the aid of a blower and other equipment, thus saving energy compared with traditional bag-type dust collectors.

[0058] Example 2, effect test of detachable tapered spiral flow guide

[0059] Turn on the variable frequency suction type vacuum generator, the vacuum dust removal chamber is in a vacuum state, confirm that the filter air speed reaches 1.3 m / min and maintains stable through the electronic flowmeter, add experimental dust meeting the VDI test standard in the hopper of the variable frequency feeding assembly, confirm that the inlet dust concentration is 24 g / m³ and remains unchanged through the inlet dust concentration detector. Use polyphenylene sulfide fiber filter bags as test filter bags, set the filter bag dust cleaning mode to manual dust cleaning, the test time is 20 minutes, the number of filter bags is 2, and the positions of the two filter bags are as shown in Figure 6 The dust-containing airflow can be evenly dispersed to the surrounding filter bag direction through the tapered spiral flow guide, and the schematic diagram is as shown in Figure 7 The dust concentration in the dust-containing airflow is stable, after the test is completed, the filter bags are taken out from the upper filter bag outlet, and the weight gain of the two filter bags is obtained on the electronic balance; if the weight gain of the two filter bags is small, it can be considered that the flow guiding effect of the detachable tapered spiral flow guide is good. The flow guide plate in the traditional dust remover can only guide the airflow to disperse in a certain direction, and the experimental test shows that the detachable tapered spiral flow guide can guide the airflow to disperse in the entire dust removal space, and can make the dust-containing airflow evenly disperse in the entire dust removal space, which has obvious advantages compared with the traditional dust remover.

[0060] The weight gain of the two filter bags is obtained by taking them out on the electronic balance, and the difference in the amount of gas treated by each filter bag is analyzed by comparing the weight gain of each filter bag, and the comparison results are as follows.

[0061]

[0062] According to the results, the weight gain of the filter bag is about 1% different from the theoretical value, indicating that the amount of gas treated by each filter bag is uniform, and the tapered spiral flow guide has the actual effect of evenly dispersing the dust-containing airflow to the surrounding.

[0063] Example Three, Filter Performance and Dust Cleaning Performance Test:

[0064] The variable frequency suction type vacuum generator is started, the vacuum dust removal chamber enters the vacuum state, the airflow enters the dust-containing gas generating pipe under the action of pressure, the filtered air speed is confirmed to reach 1.3 m / min by the electronic flowmeter and is maintained stable. The dust meeting the VDI test standard is added in the hopper of the variable frequency feeding assembly, the conveying auger of the variable frequency feeding assembly works to convey the dust to the dust-containing gas generating pipe to form a stable dust-containing airflow with the airflow, the inlet dust concentration is confirmed to be 24 g / m3 by the inlet dust concentration detector and is kept unchanged within a small range, the dust-containing airflow is uniformly dispersed to each filter bag by the tapered spiral flow guide, polyphenylene sulfide fiber filter bags are used for testing, the filter bag dust removal mode is set to be automatic dust removal when the pressure difference of the dust collector flower plate reaches 800 Pa, the spraying force is set to be 0.5 Mpa, the spraying time is set to be 50 ms, and the test is stopped after three times of dust removal. The detection points of the filtration performance and the dust removal performance are as shown in Figure 8 The inlet dust concentration and the outlet dust concentration are detected, and the filtration efficiency is further calculated, four groups of filtration efficiency results are calculated and are as shown in the following table.

[0065]

[0066] The detection content of the dust collector flower plate pressure difference detection assembly represents the filtration resistance of the dust collector, and the filtration resistance result of the dust collector is as shown in Figure 9 The filter bag surface vibration maximum acceleration and the filter bag wall peak pressure are read by the filter bag surface vibration acceleration sensor and the filter bag wall peak pressure sensor from top to bottom of the filter bag surface measuring points, and the filter bag surface vibration acceleration and the filter bag wall peak pressure each have two measuring points. The test results are as shown in the following table.

[0067]

[0068] In summary, the performance detection of the traditional bag type dust collector is basically concentrated in the filtration performance detection, and the change of the filtration resistance of the dust collector before and after dust removal is used to measure the dust removal performance, the filtration and dust removal performance of the filter bag in the whole cycle of the bag type dust collector can be effectively detected by the filtration and dust removal performance test of the present application.

[0069] The present application has the advantages that: on the one hand, the structure of the dust collector is innovated, and on the other hand, the filtration performance and the dust removal performance of the filter bag are detected in the whole cycle. Mainly shown in: (1) dust particles can be efficiently removed, the vacuum feeding mode can reduce energy consumption, two times of pre-dust removal can be performed before the dust-containing airflow reaches the outer surface of the filter bag, the operation resistance and the burden of the filter bag are reduced, and the airflow distribution is more uniform through the tapered spiral flow guide; (2) the filtration performance and the dust removal performance of the filter bag can be detected in the whole cycle.

[0070] If the present application discloses or involves mutually fixedly connected parts or structural members, unless otherwise stated, the fixed connection can be understood as: detachably fixedly connected (for example, connected using bolts or screws), or as: non-detachable fixedly connected (for example, riveted, welded), of course, the mutually fixed connection can also be replaced by an integral structure (for example, integrally formed by using a casting process) (obviously, except for cases where integral forming process cannot be used).

[0071] In addition, the terms used to represent the positional relationship or shape in any of the technical solutions disclosed in the present application include states or shapes similar, analogous or close to them, unless otherwise stated.

[0072] Any part provided by the present application can be assembled from multiple individual components, or can be a single component manufactured by an integral forming process.

[0073] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application and not to limit them; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or some technical features can be replaced by equivalents; without departing from the spirit of the technical solutions of the present application, they should all be included in the technical solution range of the present application claimed.

Claims

1. A top air inlet helical flow baghouse dust collector comprising a dust collecting box with a filter arranged inside, a dust collecting bin connected to the lower end of the dust collecting box, characterized in that: The top of the dust removal box is provided with an air inlet hole, and the inside of the dust removal box is divided into an upper and lower distributed clean air chamber and a vacuum dust removal chamber by a screen plate. The clean air chamber is connected with a variable frequency vacuum pumping assembly, and a dust-containing air flow generating pipe is vertically arranged in the middle of the clean air chamber. The dust-containing air flow generating pipe is connected with the air inlet hole and a variable frequency feeding assembly, and the variable frequency feeding assembly is used for feeding dust to the dust-containing air flow generating pipe. The filter is arranged in the vacuum dust removal chamber, and a tapered spiral flow guide with open top and bottom is vertically arranged in the inside of the vacuum dust removal chamber. The top of the tapered spiral flow guide is connected with the bottom of the dust-containing air flow generating pipe in communication, and the circumferential side of the tapered spiral flow guide is provided with flow channels in the spiral direction to facilitate the outward dispersion of the dust-containing air flow and the contact with the filter. The tapered spiral flow guide comprises a plurality of arc-shaped blades which are connected together in a vertical direction and form a spiral shape. The diameters of the plurality of arc-shaped blades decrease in turn from top to bottom according to an arithmetic progression. The flow channels are formed between adjacent two arc-shaped blades. The distance between adjacent two arc-shaped blades increases from top to bottom in an arithmetic progression. The filter is a filter bag, and vibration acceleration sensors and filter bag wall peak pressure sensors are equidistantly arranged on the surface of the filter bag from top to bottom.

2. A top inlet helix guide baghouse precipitator according to claim 1, wherein: The tapered spiral flow guide is fixed in the uppermost central position of the vacuum dust removal chamber by a support and a movable bolt. The circumferential side of the dust removal box is provided with a transparent observation window which can be opened outward and corresponds to the position of the tapered spiral flow guide.

3. A top inlet helix guide baghouse precipitator according to claim 1, wherein: The variable frequency vacuum pumping assembly comprises an air outlet pipe connected with the clean air chamber, and the air outlet pipe is connected with a variable frequency suction type vacuum generator.

4. A top inlet helix guide baghouse precipitator according to claim 3, wherein: An outlet dust concentration detector and an electronic flow meter are mounted on the air outlet pipe. An inlet dust concentration detector is mounted on the dust-containing air flow generating pipe.

5. A top inlet helix guide baghouse precipitator according to claim 1, wherein: The dust removal box further comprises a pulse jet dust cleaning assembly which comprises a connected air compressor and a gas pocket. The output end of the gas pocket is connected with a pulse delivery pipe which extends into the inside of the clean air chamber. A plurality of nozzles are arranged at the bottom of one end of the pulse delivery pipe in the inside of the clean air chamber and correspond to the positions of a plurality of screen plate holes on the screen plate. The filter is a plurality of filters which correspond to the positions of a plurality of screen plate holes on the screen plate.

6. A top inlet helix guide baghouse precipitator according to claim 5, wherein: The plurality of screen plate holes on the screen plate are circularly arranged outward from the center of the dust-containing air flow generating pipe.

7. A top inlet helix guide baghouse precipitator according to claim 1, wherein: The dust removal box further comprises a differential pressure detection assembly which is connected with pressure measuring holes equidistantly arranged on the upper and lower sides of the screen plate.

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