CN108993038B - Rotary switching type air flow ash removal bag type dust collector - Google Patents
Rotary switching type air flow ash removal bag type dust collector Download PDFInfo
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- CN108993038B CN108993038B CN201811010634.XA CN201811010634A CN108993038B CN 108993038 B CN108993038 B CN 108993038B CN 201811010634 A CN201811010634 A CN 201811010634A CN 108993038 B CN108993038 B CN 108993038B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
- B01D46/04—Cleaning filters
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- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
A rotary switching type airflow dust removal bag type dust collector comprises a box body and a rotary switching type airflow dust removal mechanism; the ash removal mechanism comprises a booster fan, an ash removal air box and a rotary valve; the air inlet of the booster fan is connected with the air purifying chamber, and the air outlet of the booster fan is connected with the booster air pipe; the supercharging air pipe extends into the ash removal air box and is positioned between the pattern plate and the ash removal air box cover plate; the rotary valve body is respectively communicated with the air purifying chamber, the ash removal air box and the supercharging air pipe, the rotary valve is cut off and communicated with the supercharging air pipe when in a filtering state, and the rotary valve is cut off and communicated with the air purifying chamber when in an ash removal state; by providing the back-blowing airflow with stable pressure, the filter bag is not damaged when the filter bag is used for cleaning dust, the service life of the filter bag is prolonged, the dust cleaning effect is greatly improved, the filter bag is effectively prevented from being hardened, and meanwhile, the pulse blowing device is saved.
Description
Technical Field
The invention belongs to the field of dust removal of dust-containing gas, and particularly relates to a rotary switching type air flow dust removal bag type dust remover.
Background
At present, the bag type dust collector is widely applied to purifying dust-containing gas generated in industries such as power generation, cement, chemical industry, metallurgy, mine, grain processing and the like. The working principle of the bag type dust collector is that dust-containing gas is introduced into the dust collector and penetrates through a filter bag arranged in the dust collector, and dust particles are intercepted and retained on the surface of the filter bag to form a dust layer. The clean air smoothly passes through the filter bag and flows out of the dust remover. After the bag type dust collector operates for a period of time, the dust layer accumulated on the dust facing surface of the filter bag of the bag type dust collector becomes thicker and thicker, so that the resistance loss of the dust collector is increased. Therefore, after the bag house is operated for a certain period of time, the ash removal is required.
The existing bag type dust collector mainly adopts two modes of pulse blowing dust removal and air pressure back blowing.
The pulse blowing ash-cleaning mode is characterized by that high-pressure air is blown into the filter bag at high speed in a short time (generally less than 0.2 second) to produce back-blowing air flow opposite to filtering air flow so as to make the interior of the filter bag produce pulse expansion vibration and the wall of the filter bag obtain high outward acceleration so as to shake off dust and make the dust layer on the surface of the bag fall off. The long-term and repeated deformation of the filter bag can accelerate the fatigue of the filter bag, and the service life of the filter bag is obviously shortened. The cost of the filter bag occupies a large proportion in the whole dust collector, and the pulse blowing dust cleaning mode increases the loss of the filter bag through the change of the shape of the filter bag, so that the problem that the filter bag is easy to damage is very obvious.
The back-blowing mechanism is an important component of the ash removal system of the large-scale back-blowing bag type dust collector. At present, the back-blowing mechanisms are basically arranged in the dust remover, are limited by a plurality of factors of temperature environment, are easy to leak air through a back-blowing valve, and are easy to break down the machine; in addition, in the actual operation process, due to the constraint of equipment processing precision, installation precision, quality of installation workers and the limitation of a mechanical structure, position deviation often occurs between each positioning back blowing point and each sub-chamber theoretical inlet position, and a large amount of back blowing air volume loss is caused. And the problems of difficult maintenance, high labor intensity and the like.
Disclosure of Invention
Aiming at the technical defects of the prior bag type dust collector, the invention aims to provide a rotary switching type air flow dust cleaning mechanism bag type dust collector which is stable and reliable in operation, simple and convenient to install and low in equipment cost.
The purpose of the invention is realized by the following technical scheme:
a rotary switching type airflow dust removal bag type dust collector comprises a box body and a rotary switching type airflow dust removal mechanism; a pattern plate is horizontally arranged in the box body; the pattern plate is connected with a plurality of filter bags; the box body is divided into an upper cavity and a lower cavity by the pattern plate and the filter bag, the dust air chamber is positioned at the lower part, and the air purifying chamber is positioned at the upper part; it is characterized in that the ash cleaning mechanism comprises a booster fan, an ash cleaning bellows and a rotary valve; the air inlet of the booster fan is connected with the air purifying chamber, and the air outlet of the booster fan is connected with the booster air pipe; the dust removal air box cover plate is arranged above the pattern plate, the mounting position of the dust removal air box cover plate is higher than the upper top surface of the supercharging air pipe, and the dust removal air box cover plate, the side wall of the dust remover and the pattern plate form a dust removal air box; the supercharging air pipe extends into the ash removal air box and is positioned between the pattern plate and the ash removal air box cover plate; the rotary valve body is respectively communicated with the air purifying chamber, the ash removal air box and the supercharging air pipe, when the rotary valve is in a filtering state, the rotary valve cuts off the communicated supercharging air pipe, after the filter bag filters, gas enters the air purifying chamber after passing through the ash removal air box and the valve body, when the rotary valve is in an ash removal state, the rotary valve cuts off the communicated air purifying chamber, and the back blowing gas enters the ash removal air box after passing through the supercharging air pipe and the valve body.
The advantages and the beneficial effects of the invention are as follows:
1. compared with the prior art, the invention has the advantages that the filter bag is in a tensioning state, the pressure of the ash removal airflow is kept stable and the pressure is lower, and the filter bag is still during ash removal. Therefore, the filter bag is hardly damaged during ash removal, and the service life of the filter bag is remarkably prolonged. Meanwhile, the low-pressure stable ash-cleaning airflow replaces the high-frequency pulse back-blowing airflow in the prior art, so that a device for manufacturing the high-frequency pulse back-blowing airflow can be omitted, the equipment is simplified, the cost is reduced, and the running reliability of the equipment is improved.
2. The ash removal mechanism designed by the invention realizes the switching between the filtering state and the ash removal state of each ash removal chamber by opening and closing the filtering valve and the ash removal valve in a matching way, and any one ash removal chamber can not influence the filtering of other ash removal chambers when in ash removal.
3. The central position of the filter box is the installation position of the ash removal mechanism of each chamber, so that the number of the cloth bags for removing ash on two sides is the same, the positions are the same, the air flow has a balanced effect on the two sides, the ash removal effect is basically the same, the ash removal efficiency is basically the same, and the effect is far greater than that of one side.
4. The flange frames with reinforced strength on the two side surfaces of the shared valve and the elastic sealing high-temperature-resistant materials embedded around the door greatly improve the air tightness of the valve.
5. The invention blows back air flow with stable pressure into the filter bag; the back-blowing airflow is cut off after the preset time is continued, so that the filter bag is not damaged during dust removal, the dust removal effect is greatly improved, and the hardening of the filter bag is effectively prevented.
Drawings
FIG. 1 is a front view of a rotary switching type air flow dust-cleaning bag type dust collector,
FIG. 2 is a partial side view of the ash removal mechanism.
FIG. 3 is a schematic view of a rotary valve configuration.
FIG. 4 is a schematic view of a rotary valve installation.
Fig. 5 is a schematic view of a rotary valve filtration state.
FIG. 6 is a schematic view showing the ash removal state of the rotary valve.
FIG. 7 is a block diagram of a rotary valve plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, it being understood that the description herein is illustrative and explanatory only and is not restrictive of the invention, as claimed.
Please refer to fig. 1. The figure is a front view of the structure of the rotary switching type airflow ash removal bag type dust collector.
As shown in fig. 1, the bag house includes a box body, which is generally made of a metal material. The lower portion of the box is supported by a support, which is typically a steel frame. The bottom of the box body is provided with one or more ash collecting hoppers.
The interior of the box body is horizontally provided with a pattern plate, and the pattern plate is provided with a plurality of plate holes. The card is fixedly connected with a plurality of filter bags. The filter bag is a flat bag with two parallel side walls and is arranged in the box body in a matrix manner, and a channel facing the air inlet is formed between the two corresponding side walls of the two adjacent filter bags. A gasket is arranged between the bag opening of the filter bag and the pattern plate. The gasket can be made of the same material as the filter bag. The gasket can be further fixedly connected with the bag mouth of the filter bag, for example, the gasket and the bag mouth are sewn into a whole. The pressing device presses and fixes the bag opening of the filter bag and the gasket at the edge of the hole of the pattern plate through the bag opening blank holder. A bag cage for tensioning the filter bag is inserted in the filter bag and has high-density supporting points. In particular, the weight of the bag cage can be borne entirely by the filter bag; or the flower plate and the filter bag can bear together.
The box body is divided into an upper cavity and a lower cavity by the pattern plate and the filter bag, the dust air chamber is positioned at the lower part, and the air purifying chamber is positioned at the upper part. The outer surface of the filter bag faces the dust air chamber, and the inner surface of the filter bag faces the air purifying chamber. An air inlet and an air outlet are further formed in the box body, the air inlet is communicated with the dust air chamber, and the air outlet is communicated with the air purifying chamber.
The bag type dust collector further comprises a rotary valve airflow ash removal mechanism used for carrying out airflow back blowing ash removal on the bag type dust collector.
The ash removal mechanism comprises a booster fan, an ash removal air box and a plurality of rotary valves. The booster fan sets up on the fan platform of dust remover outside installation, and the booster fan air inlet is through getting the tuber pipe and connecting the air-purifying chamber, adopts the flue gas after the purification as the blowback air supply, and the booster fan air outlet is connected the booster air pipe. The supercharging air pipe is arranged on the central axis of the pattern plate, and a plurality of plate holes are formed in the areas on two sides of the supercharging air pipe on the pattern plate. The section of the booster air pipe is rectangular, one end of the booster air pipe is closed, the other end of the booster air pipe is connected with an air outlet of a booster fan, the booster fan provides ash cleaning airflow with stable pressure, and the pressure of the ash cleaning airflow is slightly higher than that of dust-containing gas in the dust air chamber.
The supercharging air pipe can also be arranged on the side edge of the pattern plate, and correspondingly, a plurality of plate holes are formed in the pattern plate in the area on one side of the supercharging air pipe.
The dust-cleaning air box cover plate is arranged above the pattern plate, the mounting position of the dust-cleaning air box cover plate is higher than the upper surface of the supercharging air pipe, and the dust-cleaning air box cover plate, the side wall of the dust remover and the pattern plate form the dust-cleaning air box.
A plurality of clapboards can be vertically installed between the ash removal air box cover plate and the pattern plate to form a plurality of independent ash removal chambers, the independent ash removal chambers use the pattern plate as a bottom plate, the clapboards which are vertically and fixedly connected on the pattern plate are used as side walls, and the ash removal air box cover plate is used as a top plate. Each independent ash cleaning chamber can perform back-blowing ash cleaning operation on the covered filter bags.
Each independent ash cleaning chamber is provided with a corresponding rotary valve, and the rotary valve comprises an action mechanism, a rotary shaft, a valve plate and a valve body.
As shown in fig. 3, the valve body is a square box structure, the lower bottom surface of the valve body is provided with a hole, a rotating shaft is arranged at one vertical side edge of the valve body, and a rectangular valve plate is arranged at the lower end part of the rotating shaft. The side A, the side B of the adjacent both sides of rotation axis and face B are the trompil, realize valve seal structure in the cooperation of rotatory side trompil and rectangle valve plate, and the rotation axis during operation carries out 90 degrees rotations, and the valve plate can be sealed with the trompil of side A, side B respectively.
The air compressor is characterized by also comprising a pressurizing air branch pipe, wherein the pressurizing air branch pipe is of a square box structure, the lower bottom surface of the pressurizing air branch pipe is provided with a hole and is arranged on the upper top surface of the pressurizing air pipe, and the upper part of one side surface of the pressurizing air branch pipe is provided with a hole which is matched with the hole A part on the side surface of the valve body. And the pressure boosting air branch pipe is used for guiding the back-blowing air flow in the pressure boosting air pipe to the valve body.
As shown in FIG. 4, when the rotary valve is installed, the valve body is installed on the ash removal air box cover plate, the ash removal air box cover plate is provided with an opening, and the opening on the lower bottom surface of the valve body is matched with the opening of the ash removal air box cover plate for installation. After the installation is finished, the opening on the lower bottom surface of the valve body is communicated with the ash removal subchamber, and the opening on the side surface B of the valve body is communicated with the air purification chamber.
The side A is provided with a filtering valve hole, and the side B is provided with an ash removal valve hole. When the valve plate rotates to seal the filtering valve hole, the pressurizing air branch pipe is closed, the outlet of the air purifying chamber is opened, and filtered air flow in the ash removing chamber at the lower part of the valve body enters the air purifying chamber through the valve body to work in a filtering state. When the valve plate rotates to seal the ash removal valve hole, the outlet of the air purifying chamber is sealed, the pressurizing air branch pipe is opened, and the blowback air flow in the pressurizing air branch pipe enters the ash removal subchamber through the valve body to work in an ash removal state.
The valve and the valve hole can be round or rectangular. The corresponding valve body can be adjusted and changed in structure, and the pressurizing air branch pipe can be of pipe fitting structures in other shapes.
The actuating mechanism adopts various driving modes such as electric power, magnetic force, pneumatic or hydraulic pressure and the like.
The actuating mechanism is connected with a rotating shaft for rotating and driving, the rotating shaft is installed and positioned through an upper end support and a lower end support, and the other end of the rotating shaft is connected with a valve plate rotating shaft.
When the rotating shaft is connected with the valve plate rotating shaft, a coaxial sleeve structure is adopted, and the end part of the rotating shaft is sleeved outside the valve plate rotating shaft in a hollow mode and is fixed by a locking screw. The purpose is to adjust the position state of the rotary switch of the valve plate.
The middle part of the valve plate is provided with a flange frame, the left side and the right side are embedded with elastic sealing strips around and are respectively in sealing fit with the filtering valve hole and the ash removal valve hole, and a valve plate rotating shaft is arranged on one vertical side edge of the valve plate.
A guide plate is arranged in a dust cleaning chamber in the dust cleaning mechanism to uniformly distribute the entering back-blowing airflow. The incoming air is distributed more reasonably through the guide plate, the air averagely reaches each cloth bag is balanced, and the ash removal effect is better.
The invention usually only needs one booster fan to provide back-blowing airflow for a plurality of ash-cleaning subchambers, and can also be arranged that the plurality of booster fans correspond to one or a plurality of booster air pipes and are connected with a plurality of booster fan air outlets through connecting pipes, the connecting pipes are provided with stop valves, when a certain booster fan is abnormal, the stop valves are opened, and other booster fans can replace the abnormal booster fan and cannot influence the filtration and ash cleaning of other subchambers.
The ash removal airflow provided by the ash removal mechanism is low-pressure stable airflow, and the low-pressure stable airflow penetrates through the filter bag from the interior of the filter bag and flows to the dust air chamber.
When the bag type dust collector is in a filtering state, the inside of the whole dust collector is in a negative pressure state under the drainage action of the draught fan positioned at the air outlet. The filtered gas stream containing dust particles enters the dust chamber from the gas inlet under atmospheric pressure. The dust particles are blocked by the outer surface of the filter bag when passing through the filter bag, and the filter airflow without the dust particles enters the filter bag and further enters the air purifying chamber. The clean gas filtered by each filter bag is collected in the gas purifying chamber and then flows out from the gas outlet. The flow path of the filtering airflow is from the air inlet to the dust air chamber, then enters the air purifying chamber through the filter bag and finally flows out from the air outlet. This achieves filtration of the dust-laden gas.
When the bag type dust collector needs to clean dust, the dust cleaning mechanism executes action and blows low-pressure stable dust cleaning airflow which lasts for a preset time into a filter bag needing to clean dust. The predetermined time may specifically be 8 seconds to 18 seconds. The pressure of the deashing gas flow is slightly higher than that of the dust-containing gas in the dust chamber, and the pressure difference between the deashing gas flow and the dust-containing gas chamber can be 2000 Pa to 10000 Pa. After the reverse blowing airflow penetrates through the filter bag in a tensioned state, a gasification layer is formed between the dust layer on the outer surface of the filter bag and the filter cloth layer, and the adhesion between the dust layer and the filter cloth layer is damaged. The dust layer on the outer surface of the filter bag immediately slides downwards to the dust collecting hopper under the action of self gravity.
Compared with the bag type dust collector in the prior art, the bag type dust collector has the advantages that the filter bag is in a tensioning state, the pressure of the ash removal airflow is kept stable and the pressure is lower, and the filter bag is static during ash removal. Therefore, the filter bag is hardly damaged during ash removal, and the service life of the filter bag is remarkably prolonged. Meanwhile, the low-pressure stable ash-cleaning airflow replaces the high-frequency pulse back-blowing airflow in the prior art, so that a device for manufacturing the high-frequency pulse back-blowing airflow can be omitted, the equipment is simplified, the cost is reduced, and the running reliability of the equipment is improved.
As shown in figure 5, when the bag-type dust collector is in a filtering state, the valve plate rotates to seal the side surface A filtering valve hole, the pressurizing air branch pipe is closed, the outlet of the air purifying chamber is opened, and filtered air flow in the ash removing chamber at the lower part of the valve body enters the air purifying chamber through the valve body
As shown in FIG. 6, when the pressure difference reaches the set ash removal pressure difference, the booster fan is automatically turned on to perform airflow ash removal. When the bag type dust collector is used for cleaning dust, the valve plate is rotated to seal the dust cleaning valve hole on the side surface B, the outlet of the air purifying chamber is sealed, the pressurizing air branch pipe is opened, and the back-blowing air flow in the pressurizing air branch pipe enters the dust cleaning branch chamber through the valve body to work in a dust cleaning state. Therefore, the ash removal of the ash removal chambers of the bag type dust collector corresponding to the filter bags is realized.
The ash removal mechanism disclosed by the invention realizes the opening or closing of the filtering valve hole and the ash removal valve hole in a matched manner by utilizing the same rotary valve to be matched with the filtering valve hole and the ash removal valve hole. Realize the switching between the filtering state and the ash cleaning state of each ash cleaning chamber,
the ash removal subchambers are mutually isolated and independently operated, the filter of other ash removal subchambers cannot be influenced when any ash removal subchamber is used for removing ash, the structure is simple, and the operation is convenient.
The pressurizing air pipe in the ash cleaning mechanism can also be communicated with the outlet of the induced draft fan connected with the air outlet. The pressure of the purified gas at the outlet of the induced draft fan connected with the air outlet is slightly higher than the atmospheric pressure, and the purified gas can also be used as a gas source of the deashing airflow. Meanwhile, the temperature of the purified gas flowing out of the outlet of the induced draft fan is basically the same as that of the gas in the bag type dust collector, so that an additional heating device is not needed.
Finally, it should be noted that: although the present invention has been described in detail, it will be apparent to those skilled in the art that changes may be made in the above embodiments, and equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A rotary switching type airflow dust removal bag type dust collector comprises a box body and a rotary switching type airflow dust removal mechanism; a pattern plate is horizontally arranged in the box body; the pattern plate is connected with a plurality of filter bags; the box body is divided into an upper cavity and a lower cavity by the pattern plate and the filter bag, the dust air chamber is positioned at the lower part, and the air purifying chamber is positioned at the upper part; it is characterized in that the ash cleaning mechanism comprises a booster fan, an ash cleaning bellows and a rotary valve; the air inlet of the booster fan is connected with the air purifying chamber, and the air outlet of the booster fan is connected with the booster air pipe; the dust removal air box cover plate is arranged above the pattern plate, the mounting position of the dust removal air box cover plate is higher than the upper top surface of the supercharging air pipe, and the dust removal air box cover plate, the side wall of the dust remover and the pattern plate form a dust removal air box; the pressurized air pipe extends into the ash removal air box and is positioned between the pattern plate and the ash removal air box cover plate, and the pressurized air pipe is positioned in the inner space of the ash removal air box; the rotary valve body is arranged above the ash removal air box cover plate and is connected with the supercharging air pipe through the supercharging air branch pipe; the rotary valve body is respectively communicated with the air purifying chamber, the ash removal air box and the supercharging air pipe, when the rotary valve is in a filtering state, the connection with the supercharging air pipe is cut off, gas filtered by the filter bag enters the air purifying chamber after passing through the ash removal air box and the valve body, when the rotary valve is in an ash removal state, the connection with the air purifying chamber is cut off, and back blowing gas enters the ash removal air box after passing through the supercharging air pipe and the valve body;
the rotary valve body adopts a square box body structure, and the lower bottom surface of the valve body is provided with a hole for connecting an ash removal air box; a vertical rotating shaft is arranged at one vertical side edge of the valve body, and a valve plate is arranged at the lower end part of the rotating shaft; all trompil on the adjacent first side of rotation axis, the second side, trompil and valve plate cooperation realize valve seal structure, and the rotation axis during operation carries out 90 degrees rotations, and the valve plate can be sealed with the trompil of first side, second side respectively.
2. The rotary switching air flow bag type dust collector of claim 1, wherein: a plurality of clapboards are arranged between the ash removal air box cover plate and the pattern plate to form a plurality of independent ash removal chambers, the independent ash removal chambers take the pattern plate as a bottom plate, the clapboards as side walls and the ash removal air box cover plate as a top plate; each independent ash removal chamber is provided with a corresponding rotary valve; each independent ash cleaning chamber can perform back-blowing ash cleaning operation on the covered filter bag.
3. The rotary switching air flow bag type dust collector of claim 1, wherein: the supercharging air pipe is arranged on the central axis of the pattern plate, and a plurality of plate holes are formed in the pattern plate in the areas on two sides of the supercharging air pipe; or the supercharging air pipe is arranged on the side edge of the pattern plate, and a plurality of plate holes are formed in the pattern plate in the area on one side of the supercharging air pipe.
4. The rotary switching air flow bag type dust collector of claim 1, wherein: the first side surface is provided with an opening of an ash removal valve hole which is used for leading to the air purifying chamber; the second side surface is provided with a filtering valve hole for connecting a boosting air pipe; when the valve plate seals the filtering valve hole, the rotary valve is in a filtering state, and when the valve plate seals the ash removal valve hole, the rotary valve is in an ash removal state.
5. The rotary switching air flow bag type dust collector of claim 1, wherein: the booster fan, the ash removal air box and the rotary valve in the ash removal mechanism are formed by splicing plate components.
6. The rotary switching air flow bag type dust collector of claim 1, wherein: the rotary valve comprises an actuating mechanism, a rotating shaft and a valve plate; the actuating mechanism is arranged on the top cover of the box body, the rotating shaft is positioned through the support, and the lower end of the rotating shaft is connected with the valve plate.
7. The rotary switching air flow bag type dust collector of claim 4, wherein: the valve plate and the valve hole are circular or rectangular.
8. The rotary switching air flow bag type dust collector of claim 6, wherein: when the rotating shaft is connected with the valve plate rotating shaft, a coaxial sleeve structure is adopted, the end part of the rotating shaft is sleeved outside the valve plate rotating shaft in a hollow mode and is fixed by a locking screw, and the position state of a rotary switch of the valve plate is adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811010634.XA CN108993038B (en) | 2018-08-31 | 2018-08-31 | Rotary switching type air flow ash removal bag type dust collector |
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| CN201811010634.XA CN108993038B (en) | 2018-08-31 | 2018-08-31 | Rotary switching type air flow ash removal bag type dust collector |
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| CN108993038A CN108993038A (en) | 2018-12-14 |
| CN108993038B true CN108993038B (en) | 2021-03-30 |
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| CN109603336B (en) * | 2019-02-20 | 2021-03-30 | 北京博电兴源节能科技有限公司 | Rotary valve core type air flow ash removal bag type dust collector |
| CA3137390C (en) * | 2020-03-18 | 2024-01-02 | Suzhou Alton Electrical & Mechanical Industry Co., Ltd. | Vacuum cleaner |
| CN113941199B (en) * | 2021-05-19 | 2023-06-20 | 重庆工程职业技术学院 | Back-blowing structure for bag-type dust removal and bag-type dust removal device |
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| CN200977447Y (en) * | 2006-11-24 | 2007-11-21 | 云南银发环保集团股份有限公司 | Electric bag combined duster |
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