CN113041735A - Bag type air filter and filtering method thereof - Google Patents
Bag type air filter and filtering method thereof Download PDFInfo
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- CN113041735A CN113041735A CN202110327555.7A CN202110327555A CN113041735A CN 113041735 A CN113041735 A CN 113041735A CN 202110327555 A CN202110327555 A CN 202110327555A CN 113041735 A CN113041735 A CN 113041735A
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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
- B01D46/06—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material with means keeping the working surfaces flat
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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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4263—Means for active heating or cooling
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- Chemical Kinetics & Catalysis (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The invention discloses a bag type air filter and a filtering method thereof, and belongs to the technical field of bag type air filters. The invention discloses a bag type air filter, which is formed by connecting a main frame and an auxiliary frame, wherein a telescopic mechanism is arranged in the main frame and is connected with an inner frame to support filter bags, the filter bags are separated through a partition plate, the filter bags are prevented from being attached together to influence the overall filtering effect, meanwhile, the telescopic rods have different telescopic grades, the opening sizes of the filter bags can be controlled, different filtering areas can be adjusted, the filtering effect is improved, the main frame is suitable for different filtering environments, a heating device is arranged in the main frame, the temperature difference between the inside and the outside can be reduced, the phenomenon of condensation is prevented, dust is prevented from being adhered to the filter bags and is difficult to clean, a fixing seat at the bottom is integrally fixed on the filter bags, the disassembly and the cleaning are convenient, violent operation is not needed, the integrity of the filter.
Description
Technical Field
The invention discloses a bag type air filter, in particular to a bag type air filter and a filtering method thereof.
Background
The bag filter is a multipurpose filtering device which has the advantages of novel structure, small volume, simple and flexible operation, energy conservation, high efficiency, closed work and strong applicability. Bag filters are a new type of filtration system. The bag filter is internally provided with a metal mesh basket for supporting a filter bag, liquid flows in from an inlet, flows out from an outlet after being filtered by the filter bag, impurities are intercepted in the filter bag, and the filter bag can be continuously used after being replaced.
At present, the pocket type air cleaner that we used, be in the same place through screwed connection between main frame and the subframe, and this kind of connected mode is common, the practicality is very high, and easy operation, but filter service life is too long, can lead to the connecting hole corrosion condition to appear, and the mode through dismantling the screw, can lead to threaded connection position fracture etc. to appear, at this moment, former screw match is not last, if change the screw of big model, can be because of the connecting hole size is improper, the forced installation leads to the connecting hole to receive 2 damages, and big screw is firm inadequately with the connecting hole connection, can appear rocking scheduling problem in the course of the work, influence the operating mass of filter.
The filter bag body material that we used is comparatively expensive, and this kind of filter bag is fixed mounting on the frame usually, when needs clearance filter bag, needs to take off the filter bag and clear up, but inconvenient dismantlement under traditional mounting means, if non professional violently when dismantling, can damage the filter bag surface and can't install on the frame, and the only solution is exactly the filter bag of more renewing, causes the cost waste because of the misoperation.
Disclosure of Invention
The purpose of the invention is as follows: a bag type air filter and a filtering method thereof are provided to solve the above problems of the prior art.
The technical scheme is as follows: the utility model provides a bag type air filter, includes the main frame, sets up the sub-frame of main frame inboard sets up filter bag on the sub-frame, with the fixing base that the sub-frame links together sets up the inside heating device that can generate heat fast of main frame, and reach the long-time constant temperature in heat peak value back, with filter bag tip fixed connection telescopic machanism together.
In a further embodiment, the sub-frame comprises a plurality of groups of inner frames fixedly connected with the main frame, a lower frame connected with the bottom of the inner frames in a turnover mode, and an upper frame connected with the inner frames in a pin mode;
the inner frames are connected in a sliding mode, the telescopic mechanism is connected with the inner frames in a rotating mode, and outer wall clamping strips are arranged at the upper end portions of the inner frames.
In a further embodiment, the lower frame is arranged in an "L" shape, a concentric through hole is formed in the surface of the lower frame, a concentric internal thread is formed inside the concentric through hole, the concentric through hole penetrates through the bottom of the main frame, and the main frame and the lower frame are connected together in a threaded manner;
the surface of the lower frame is provided with a plurality of fixing grooves, the fixing seats are fixedly connected with the fixing grooves, and the fixing grooves are arranged among the inner frames.
In a further embodiment, the length of the upper frame is greater than that of the whole main frame, and a U-shaped clamping groove is formed in the end part of the inner wall of the upper frame and matched with the outer wall clamping strip;
limiting blocks are arranged at the end parts of the two sides of the clamping groove and are contained in the clamping groove;
the inner surface of the upper frame is provided with a plurality of fixing grooves, the fixing grooves are in interference fit with the upper side end part of the inner frame, and the inner frame is connected with the upper frame at a uniform distance.
In a further embodiment, the heating device comprises a self-locking switch electrically connected with an external motor, and a temperature control switch connected with the self-locking switch and used for measuring the temperature in the main frame and controlling heating or disconnecting the heating wire at any time;
the self-locking switch comprises a self-locking female head and a self-locking male head, wherein the self-locking female head is connected with the external motor, the self-locking male head is matched with the self-locking female head in structure, the self-locking switches are arranged into a plurality of groups, and the design structures of the plurality of groups of self-locking switches are the same.
In a further embodiment, the temperature control switches are arranged between the heating wire and the self-locking switches, the temperature control switches are arranged at two ends of the heating wire, 2 temperature control switches are connected in series, and whether the internal temperature of the main frame reaches a highest peak value is analyzed;
temperature detect switch detects external temperature, in time carries out the adjustment of inside heating temperature peak value, prevents because of the great condensation phenomenon that causes of inside and outside temperature variation value, and the adhesion is at the filter bag inner wall, difficult clearance.
In a further embodiment, the telescoping mechanism comprises a first support bar slidably connected to an inner frame, a second support bar resiliently connected to the first support bar, the telescoping mechanism compressing the overall volume of the filter bag;
the telescopic mechanism can realize telescopic actions in four directions of left, right, upper and lower directions, and the longest distance of the telescopic mechanism extends to the upper end face of the fixed seat;
the telescopic machanism changes flexible state through outside air environment quality, can divide into one-level flexible, second grade flexible and tertiary flexible, adapts to holistic filtration demand.
In a further embodiment, the integral structure of the fixing seat is in an I shape, a circle of fixing hooks is encircled in the hollow position of the fixing seat, and the filter bag is fixedly connected with the fixing hooks;
a gap of 0.3-0.5cm is arranged between the fixed seat and the fixed groove.
In a further embodiment, a separation plate is arranged between the inner frames, the separation plate is arranged in a straight line shape, and the separation plate is arranged above the telescopic mechanism;
the divider plate is positioned within each filter bag pleat to restrain the filter bags from coming together, with the top of the divider plate extending the furthest into the filter bags.
In a further embodiment, a bag air filter and method of filtering the same includes the steps of:
step 1: the air filter is connected with a power supply, the male head and the female head of the self-locking switch are electrically connected together, and the heating device starts to work; the heating device firstly senses the outside weather temperature, internal preheating is carried out, meanwhile, the highest heating temperature of the internal heating wire is adjusted to be suitable for the outside weather temperature, and the temperature difference between the heating device and the external heating wire is shortened as much as possible;
step 2: when the internal temperature of the inner frame reaches a peak value, the temperature control switch controls the heating wire to stop heating, and when the difference between the internal temperature and the external temperature is increased to a lower limit value, the temperature control switch controls the heating wire to start heating again, so that the internal temperature is kept in a constant temperature state for a long time;
and step 3: a plurality of filter bags are separated by the partition plates, the filter bags are integrally jacked up by the partition plates, the supporting effect is achieved, and the adsorption area of each filter bag is the same in the working process of the air filter.
And 4, step 4: the whole volume of the filter bag is compressed through the telescopic mechanism, when dust with different viscosities is collected, the telescopic mechanism is opened to reach the corresponding telescopic grade, and the filter bag is opened, so that the contact area of the whole filter bag and the dust is increased;
and 5: when the dust in the inside is piled up too much, can carry out the dust clearance in the filter bag through dismantling solid fixed ring on the bottom fixing base, and can hang solid fixed ring installation relevant position in the fixing base with solid fixed ring after the clearance is accomplished can.
Has the advantages that: the invention discloses a bag type air filter, which is formed by connecting a main frame and an auxiliary frame, wherein a telescopic mechanism is arranged in the main frame and is connected with an inner frame to support filter bags, the filter bags are separated through a partition plate, the filter bags are prevented from being attached together to influence the overall filtering effect, meanwhile, the telescopic rods have different telescopic grades, the opening sizes of the filter bags can be controlled, different filtering areas can be adjusted, the filtering effect is improved, the main frame is suitable for different filtering environments, a heating device is arranged in the main frame, the temperature difference between the inside and the outside can be reduced, the phenomenon of condensation is prevented, dust is prevented from being adhered to the filter bags and is difficult to clean, a fixing seat at the bottom is integrally fixed on the filter bags, the disassembly and the cleaning are convenient, violent operation is not needed, the integrity of the filter.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an overall front view of the present invention.
Fig. 3 is a schematic view of the structure of the heating apparatus of the present invention.
Fig. 4 is an overall plan view of the present invention.
Fig. 5 is a schematic structural view of the telescopic mechanism in the present invention.
Fig. 6 is a schematic structural view of the fixing base in the present invention.
The reference signs are: the bag type air filter comprises an inner frame 1, a lower frame 2, a main frame 3, a bag type air filter body 4, a filter bag 5, a self-locking male head 6, a self-locking female head 7, a temperature controller 8, a heating wire 9, a partition plate 10, an upper frame 11, a first supporting plate 12, a connecting spring 13, a second supporting plate 14, a fixing ring 15, a fixing seat 16, a heating device 17 and a telescopic mechanism 18.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.
As shown in fig. 1 to 6, a bag type air filter and a filtering method thereof are composed of an inner frame 1, a lower frame 2, a main frame 3, a bag type air filter body 4, a filter bag 5, a self-locking male head 6, a self-locking female head 7, a temperature controller 8, a heating wire 9, a partition plate 10, an upper frame 11, a first support plate 12, a connecting spring 13, a second support plate 14, a fixing ring 15, a fixing seat 16, a heating device 17 and a telescopic mechanism 18.
As shown in fig. 1 to 6, the bag air filter body 4 is disposed at a designated position, the bag air filter is supported by the main frame 3 and the sub-frame, the main frame 3 is disposed inside as a hollow structure, the heating device 17 is disposed inside the main frame 3, the heating device 17 includes a self-locking male head 6 electrically connected with the bag air filter body 4, the self-locking male head 6 is adapted to the self-locking female head 7, the self-locking female head 7 is electrically connected with the self-locking male head 6, the temperature controller 8 is disposed at the bottom of the self-locking female head 7, the heating wires 9 are fixedly connected with the temperature controller 8, and the 2 temperature controllers 8 are disposed at both side ends of the heating wires 9; the main frame 3 is connected with the subframe, the subframe comprises an inner frame 1 arranged inside the main frame 3, the inner frame 1 is connected with the upper frame 11, the inner frame 1 is connected with the lower frame 2, a fixing groove is arranged on the surface of the lower frame 2, the fixing seat 16 is arranged on the surface of the lower frame 2 and is in threaded connection with the groove on the surface of the lower frame 2, a clamping groove is arranged on the edge of the upper frame 11 and is clamped with the upper end of the inner frame 1, a plurality of groups of clamping grooves are arranged in the middle of the upper frame 11, the middle clamping groove of the upper frame 11 is tangential to the transverse direction of the inner frame 1, the fixing seat 16 is in an I shape, the fixing ring 15 is arranged in the hollow position of the fixing seat 16, the fixing ring 15 is fixedly connected with the filter bag 5, and the fixing ring 15 surrounds the, all be provided with fixing base 16 between the filter bag 5, telescopic machanism 18 sets up on the inner frame 1, telescopic machanism 18 including encircle first backup pad 12 on the inner frame 1, through coupling spring 13 with second backup pad 14 that first backup pad 12 links together, telescopic machanism 18 sets up to the flexible degree of multistage, telescopic machanism 18 can realize "one-level is flexible, the flexible and tertiary flexible of second grade", and filter bag 5 sets up simultaneously on the inner frame 1, a style of calligraphy division board 10 sets up on the inner frame 1, division board 10 will filter the separation, prevent the condition that the adhesion is in the same place.
As is known, a bag-type air filter used in daily life is often influenced by the external environment, the external air temperature and the like, if the temperature in the air filter is greatly different from the external environment temperature, a condensation problem occurs, so that a filter screen on the surface of a filter bag 5 is blocked, the overall filtering effect is influenced, and meanwhile, if the air filter is operated at a lower temperature and the air inlet is uneven, the interior of the air filter is rusted, so that the service life of equipment is shortened; the main frame 3 is internally provided with a hollow structure, the heating device 17 is arranged inside the main frame 3, the heating device 17 comprises a self-locking male head 6 electrically connected with the bag-type air filter body 4, the self-locking male head 6 is matched with the self-locking female head 7, the self-locking female head 7 is electrically connected with the self-locking male head 6, the temperature controller 8 is arranged at the bottom of the self-locking female head 7, the heating wire 9 is fixedly connected with the temperature controller 8, and the 2 temperature controllers 8 are arranged at the end parts of two sides of the heating wire 9; through the heating device 17 that sets up, carry out inside temperature regulation, heating device 17 inside temperature controller 8 simultaneously, can respond to the temperature of outside air, carry out inside temperature control, external temperature difference reduces as far as possible, prevent that the condensation problem from taking place, simultaneously when inside temperature reachs the settlement peak value, 8 control heater strip of temperature controller 9 deenergization, and reduce power consumption, make inside can not be because of the high temperature, cause explosion scheduling problem, the frame that preheats in advance, avoid inside corrosion problem to take place, protection air cleaner, prolonged service life.
At present, in a bag type air filter used by people, an internal filter bag 5 is often subjected to dust with strong viscosity in the use process and is adhered to the surface of a filter screen, and fine dust in flue gas enters a fiber layer of the filter screen, so that the blocking rate of the filter bag 5 is improved, the integral filtering effect is influenced, meanwhile, when the filter bag is cleaned by other methods, the filter bag 5 is easy to deform, the filtering effect is lost, and if the filter screen is replaced, the cost is increased, so that a telescopic mechanism 18 is installed; the telescopic mechanism 18 is arranged on the inner frame 1, the telescopic mechanism 18 comprises a first supporting plate 12 surrounding the inner frame 1, a second supporting plate 14 connected with the first supporting plate 12 through a connecting spring 13, the telescopic mechanism 18 is arranged to be multi-level telescopic, and the telescopic mechanism 18 can realize 'first-level telescopic, second-level telescopic and first-level three-level telescopic'; through the flexible length of different grades, can adjust the area of contact of filter screen and dust, can be under the prerequisite of not injuring the filter screen, fine one of the filterable method that carries on, and through telescopic machanism 18's adjustment, can make the adaptation environment kind selectivity of crossing filter bag 5 improve, improved air cleaner's practicality intangibly, need not the during operation at telescopic machanism 18 simultaneously, also can play the supporting role to crossing filter bag 5, the adaptability is stronger.
In contrast, in the use process of a common bag-type air filter, when non-professional personnel often clean the filter screen, the filter screen is violently pulled and damaged and needs to be replaced again, and relatively speaking, most of the filter screens 5 are made of synthetic fibers or glass fibers, so that the whole cost is high, the replacement cost is high, cost waste and unreliability are caused due to artificial damage, and meanwhile, most of the traditional connection modes between the filter screens 5 and the frame are sewn together and are compressed for the second time through metal products such as iron wires, so that the disassembly process is difficult, the cleaning efficiency is low, and the smoothness of the filter screen cannot be ensured; (ii) a The fixing seat 16 is I-shaped, the fixing ring 15 is arranged in the hollow position of the fixing seat 16, the fixing ring 15 is fixedly connected with the filter bag 5, the fixing ring 15 surrounds the fixing seat 16 for one circle, and the fixing seats 16 are arranged between the filter bags 5; when crossing filter bag 5 and need clearing up, only need take off the filter screen from solid fixed ring 15 and clear up, easy operation need not violent operation etc. and convenient the clearance hangs back corresponding position simultaneously, just can guarantee the planarization of filter screen, guarantees the intact of filter screen, avoids increasing the cost.
The working principle of the invention is as follows:
before the bag-type air filter works, the bag-type air filter is preheated by the heating device 17, temperature control is carried out through an internal temperature switch, the bag-type air filter is matched with the external air temperature at any time, heating or disconnection operation of an internal heating wire is adjusted, electric energy is saved, meanwhile, the internal temperature of the air filter is kept in a constant state, and the bag-type air filter is different from a traditional screw connection frame structure in that a clamping strip and a groove are clamped and matched, so that the service life is prolonged, the filter bag 5 is separated from the lower frame 2 through the fixing seat 16 in the bag-type air filter, damage is avoided, the fixing ring 15 is arranged in the fixing seat 16 and connected with the filter bag 5, and the bag-type air filter is more convenient to disassemble and clean.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the embodiments, and various equivalent changes can be made to the technical solution of the present invention within the technical idea of the present invention, and these equivalent changes are within the protection scope of the present invention.
Claims (10)
1. The utility model provides a bag type air cleaner, its characterized in that, includes the main frame, sets up the sub-frame of main frame inboard sets up filter bag on the sub-frame, with the fixing base that the sub-frame links together sets up the inside heating device that can generate heat fast of main frame, and reach the long-time constant temperature behind the heat peak value, with filter bag tip fixed connection telescopic machanism together.
2. The bag air filter of claim 1, wherein said sub-frame comprises a plurality of sets of inner frames fixedly attached to said main frame, a lower frame pivotally attached to the bottom of said inner frames, and an upper frame pinned to said inner frames;
the inner frames are connected in a sliding mode, the telescopic mechanism is connected with the inner frames in a rotating mode, and outer wall clamping strips are arranged at the upper end portions of the inner frames.
3. The bag type air filter of claim 2, wherein the lower frame is provided in an "L" shape, a concentric through hole is formed in the surface of the lower frame, a concentric internal thread is formed inside the concentric through hole, the concentric through hole penetrates through the bottom of the main frame, and the main frame and the lower frame are screwed together;
the surface of the lower frame is provided with a plurality of fixing grooves, the fixing seats are fixedly connected with the fixing grooves, and the fixing grooves are arranged among the inner frames.
4. The bag type air filter of claim 2, wherein the length of the upper frame is greater than the length of the whole main frame, and a U-shaped clamping groove is arranged at the end position of the inner wall of the upper frame and matched with the clamping strip of the outer wall;
limiting blocks are arranged at the end parts of the two sides of the clamping groove and are contained in the clamping groove;
the inner surface of the upper frame is provided with a plurality of fixing grooves, the fixing grooves are in interference fit with the upper side end part of the inner frame, and the inner frame is connected with the upper frame at a uniform distance.
5. The bag type air filter of claim 1, wherein the heating means comprises a self-locking switch electrically connected to an external motor, a temperature control switch connected to the self-locking switch to measure the temperature inside the main frame and to control heating or cut off the heating wire at any time;
the self-locking switch comprises a self-locking female head and a self-locking male head, wherein the self-locking female head is connected with the external motor, the self-locking male head is matched with the self-locking female head in structure, the self-locking switches are arranged into a plurality of groups, and the design structures of the plurality of groups of self-locking switches are the same.
6. The bag type air filter of claim 5, wherein the temperature controlled switch is provided between the heater wire and the self-locking switch, the temperature controlled switch is provided at both ends of the heater wire, 2 temperature controlled switches are connected in series, and whether the temperature inside the main frame reaches the highest peak value is analyzed;
temperature detect switch detects external temperature, in time carries out the adjustment of inside heating temperature peak value, prevents because of the great condensation phenomenon that causes of inside and outside temperature variation value, and the adhesion is at the filter bag inner wall, difficult clearance.
7. The bag air filter of claim 1, wherein said telescoping mechanism comprises a first support bar slidably connected to an inner frame, a second support bar resiliently connected to said first support bar, said telescoping mechanism compressing the overall volume of said filter bag;
the telescopic mechanism can realize telescopic actions in four directions of left, right, upper and lower directions, and the longest distance of the telescopic mechanism extends to the upper end face of the fixed seat;
the telescopic machanism changes flexible state through outside air environment quality, can divide into one-level flexible, second grade flexible and tertiary flexible, adapts to holistic filtration demand.
8. The bag-type air filter of claim 1, wherein the holder is integrally formed in an "i" shape, a loop of fixing hooks is arranged around the hollow position of the holder, and the filter bag is fixedly connected with the fixing hooks;
a gap of 0.3-0.5cm is arranged between the fixed seat and the fixed groove.
9. The bag air filter of claim 2, wherein a divider plate is provided between the inner frames, the divider plate being arranged in a straight line, the divider plate being provided above the telescopic mechanism;
the divider plate is positioned within each filter bag pleat to restrain the filter bags from coming together, with the top of the divider plate extending the furthest into the filter bags.
10. A bag type air filter and a filtering method thereof are characterized by comprising the following steps:
step 1: the air filter is connected with a power supply, the male head and the female head of the self-locking switch are electrically connected together, and the heating device starts to work; the heating device firstly senses the outside weather temperature, internal preheating is carried out, meanwhile, the highest heating temperature of the internal heating wire is adjusted to be suitable for the outside weather temperature, and the temperature difference between the heating device and the external heating wire is shortened as much as possible;
step 2: when the internal temperature of the inner frame reaches a peak value, the temperature control switch controls the heating wire to stop heating, and when the difference between the internal temperature and the external temperature is increased to a lower limit value, the temperature control switch controls the heating wire to start heating again, so that the internal temperature is kept in a constant temperature state for a long time;
and step 3: the partition plates divide the plurality of filter bags into a plurality of numbers, the partition plates simultaneously jack up the whole filter bags, the supporting effect is achieved, and the adsorption area of each filter bag is the same in the working process of the air filter;
and 4, step 4: the whole volume of the filter bag is compressed through the telescopic mechanism, when dust with different viscosities is collected, the telescopic mechanism is opened to reach the corresponding telescopic grade, and the filter bag is opened, so that the contact area of the whole filter bag and the dust is increased;
and 5: when the dust in the inside is piled up too much, can carry out the dust clearance in the filter bag through dismantling solid fixed ring on the bottom fixing base, and can hang solid fixed ring installation relevant position in the fixing base with solid fixed ring after the clearance is accomplished can.
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| CN202110327555.7A CN113041735A (en) | 2021-03-26 | 2021-03-26 | Bag type air filter and filtering method thereof |
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Cited By (1)
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| CN113813673A (en) * | 2021-09-28 | 2021-12-21 | 和福忠 | Filter outer net and preparation method thereof |
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| CN111097235A (en) * | 2019-12-13 | 2020-05-05 | 江苏齐力涂装环境工程有限公司 | High-efficient filter bag of just imitating |
| CN112138480A (en) * | 2020-10-14 | 2020-12-29 | 李志双 | High-efficient environmental protection sack cleaner |
Cited By (2)
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|---|---|---|---|---|
| CN113813673A (en) * | 2021-09-28 | 2021-12-21 | 和福忠 | Filter outer net and preparation method thereof |
| CN113813673B (en) * | 2021-09-28 | 2023-05-19 | 浙江开山恺雷滤清器有限公司 | Filter outer net and preparation method thereof |
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Application publication date: 20210629 |