CN115992981B - General air precleaner and dust removal filter assembly - Google Patents
General air precleaner and dust removal filter assembly Download PDFInfo
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- CN115992981B CN115992981B CN202310282328.6A CN202310282328A CN115992981B CN 115992981 B CN115992981 B CN 115992981B CN 202310282328 A CN202310282328 A CN 202310282328A CN 115992981 B CN115992981 B CN 115992981B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention relates to a general air pre-cleaner and a dust-exhausting filter assembly, the dust-exhausting filter assembly comprises: a dust-discharging housing for providing a flow path of air, having an inlet through which air enters and an outlet through which air flows out, the side wall of the dust-discharging housing being provided with a dust-discharging port; an axial flow fan provided in the dust discharge housing for pressurizing air entering the dust discharge housing to guide the air from the inlet to the outlet; the cyclone dust removing blades are rotationally arranged at the upstream of the axial flow fan and are used for enabling air to form a cyclone so that impurities in the air can be thrown to the outside of the dust removing shell through the dust removing opening under the action of centrifugal force, and the dust removing opening is positioned at the upstream of the axial flow fan and is used for removing dust from the air at the upstream of the axial flow fan.
Description
Technical Field
The present invention relates generally to the field of air purification technology. More particularly, the present invention relates to a universal air precleaner and dust exhaust filter assembly.
Background
The air purification is an integral solution for providing sterilization, disinfection, dust fall, haze removal and the like for various indoor environmental problems, and has important significance for improving the environmental conditions of life, office, driving and the like and improving physical and mental health. Such as ventilation systems, heat exchange systems, air conditioning systems, and internal combustion engine air intake systems, require the use of clean air in different configurations or operating conditions.
The current air purification technology comprises photocatalysis technology, quantitative active oxygen technology, anion technology, HEPA filter screen, active carbon, plant purification technology, grafting macromolecule technology, ecological anion chip generation technology and the like. The purification apparatus used includes a sterilization type, a solid contaminant removal type, and a gaseous contaminant removal type depending on the type of the contaminant. The solid pollutant removing method mainly comprises mechanical filtration, electrostatic dust collection, electrostatic electret, anion and plasma filtration and the like. The solid contaminant removal purifier currently in common use mainly includes an air precleaner. The air pre-cleaner is integrated with various devices to realize direct interception of solid pollutants in the air, electrostatic dust collection and other purification treatments, so that the content of the solid pollutants in the air is reduced, and the damage to human bodies is reduced.
However, drawbacks of the currently known air precleaners include: the service life is short due to the limitation of the use environment. The structure of the air pre-cleaner needs to be customized under specific working conditions, which causes the defects of longer manufacturing time and high production cost, and limits the application and popularization of the air pre-cleaner. In the electric air precleaner, the motor in the cleaner drives the fan, and the direct contact of the motor with the high concentration dust air causes the motor and the fan surface to be easily attached with dust/debris, which may cause the motor to wear out, poor heat dissipation and then to be scrapped in severe cases.
Therefore, how to effectively improve the service life and the environmental applicability of the air pre-cleaner is a problem to be solved.
Disclosure of Invention
In order to solve one or more of the above-mentioned problems, the present invention provides a dust-removing filter assembly and a general-purpose air pre-cleaner for cleaning impurities in air.
The invention provides a dust removal filter assembly, comprising: a dust-discharging housing for providing a flow path of air, having an inlet through which air enters and an outlet through which air flows out, the side wall of the dust-discharging housing being provided with a dust-discharging port;
an axial flow fan provided in the dust discharge housing for pressurizing air entering the dust discharge housing to guide the air from the inlet to the outlet;
the cyclone dust removing blades are rotationally arranged at the upstream of the axial flow fan and are used for enabling air to form a cyclone so that impurities in the air can be thrown to the outside of the dust removing shell through the dust removing opening under the action of centrifugal force, and the dust removing opening is positioned at the upstream of the axial flow fan and is used for removing dust from the air at the upstream of the axial flow fan.
In one embodiment, the rotating blades are fixedly mounted on the axial flow fan through a rotating shaft, so that the axial flow fan drives the cyclone dust removing blades to rotate.
In one embodiment, the rotating shaft is further provided with rectifying blades.
In one embodiment, the inlet of the dust exhaust housing is provided with a flow guide for forming an outwardly diverging flow field for air after it enters the dust exhaust housing and is concentrated around the inner wall of the dust exhaust housing.
In one embodiment, the inlet of the dust exhaust housing is of a reduced diameter configuration to reduce the flow rate of air after it has passed through the inlet.
According to the scheme of the invention, after entering the dust exhaust shell, air can generate rotational flow under the guidance of the cyclone dust removal blades, impurities in the air are exhausted from the dust exhaust port under the action of centrifugal force, and then the air flows downstream through the axial flow fan. The motor of the axial flow fan is exposed in a high dust environment for a long time, so that dust is accumulated on the surface of the motor, heat dissipation is hindered to influence the performance of the motor, the motor of the axial flow fan can be protected by adding a first-stage filtering system at the upstream of the axial flow fan, and the filtering pressure of a downstream filtering system is reduced.
The present invention also provides a general-purpose air pre-cleaner, comprising: a housing extending along a longitudinal axis between a first axial end and a second axial end for providing a flow path for air, the housing providing an inlet to the air flow path at the first axial end, a dust exhaust port being provided on a side wall of the housing; an axial fan for pressurizing air entering the housing to direct air from a first axial end to a second axial end of the housing; the cyclone dust removing blades are rotationally arranged at the upstream of the axial flow fan and are used for enabling air to form a cyclone so as to enable impurities in the air to be thrown out of the shell through the dust discharging port under the action of centrifugal force, and the dust discharging port is positioned at the upstream of the axial flow fan and is used for removing dust from the air at the upstream of the axial flow fan; a first swirling mechanism provided downstream of the axial flow fan for swirling air to separate the air from impurities by centrifugal force; the fine filtering mechanism is arranged at the second axial end part in the shell and is used for filtering air passing through the first rotational flow mechanism, a channel for enabling air to flow directly or reversely is arranged in the fine filtering mechanism, and the channel is connected with an outlet of an air flow path arranged on the shell.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the invention are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a block diagram schematically showing a general type air precleaner according to embodiment 1 of the invention;
FIG. 2 is a block diagram of the dust filter assembly of FIG. 1;
FIG. 3 is a perspective view of a axial fan and cyclone dust removal blade of the dust removal filter assembly of FIG. 1;
FIG. 4 is a block diagram of another dust filter assembly;
FIG. 5 is a block diagram of a dust filter assembly of embodiment 2 of the present invention;
reference numerals illustrate: 10. an axial flow fan; 12. an outlet; 14. an axial fan harness; 15. sealing the end cover; 16. a fine filtration mechanism; 17. a third housing; 18. a separation chamber; 19. a fourth housing; 20. a first dust discharge port; 21. a blade; 22. a second housing; 24. a first housing; 27. a rotation shaft; 28. cyclone dust removal blades; 281. a wiper blade; 282. a support rib; 29. a guide cover; 30. a second dust discharge port; 31. a rectifying vane; 32. the bottom end of the arc.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the foregoing description of the present specification, the terms "fixed," "mounted," "connected," or "connected" are to be construed broadly, unless explicitly stated or limited otherwise. For example, in terms of the term "coupled," it may be fixedly coupled, detachably coupled, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other. Therefore, unless otherwise specifically defined in the specification, a person skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1 of the universal air precleaner provided by the invention:
fig. 1 is a block diagram schematically illustrating a general-type air precleaner according to an embodiment of the present invention.
As shown in fig. 1, the general air precleaner of the present invention includes a housing, an axial fan, a first swirling mechanism, and a fine filtering mechanism.
The housing extends along a longitudinal axis between a first axial end and a second axial end. The housing provides an inlet to the air flow path at the first axial end. In some embodiments, the flow path of the air within the housing after entering the housing from the inlet at the first axial end may be direct flow or may be reentrant. The outlet of the air flow path may be provided in the middle of the housing or may be provided in the second axial end of the housing. Those skilled in the art can select appropriate settings according to the requirements of the actual application scenario.
The axial flow fan is used to pressurize air entering the housing to direct air from a first axial end to a second axial end of the housing. In some embodiments, the axial flow fan may increase the pressure of the air within the housing, facilitating the flow of air within the housing, thereby accelerating the air filtration process.
The first swirling mechanism may be disposed downstream of the axial flow fan for swirling air to separate the air from the foreign substances under the action of centrifugal force. In some embodiments, the outward air swirls past the vanes and separates the air from the impurities under centrifugal force.
The fine filter mechanism may be disposed at a second axial end within the housing for filtering air passing through the first swirling mechanism. And a channel for enabling air to flow directly or reversely is arranged in the fine filtering mechanism and is connected with an outlet of an air flow path arranged on the shell. In some embodiments, when the outlet of the air flow path is disposed at the second axial end, a passage may be formed in the fine filter mechanism to direct air flow, thereby facilitating the removal of filtered clean air.
It will be further understood by those skilled in the art from the foregoing description of the present specification that terms such as "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "longitudinal," and "transverse," and the like, which refer to an orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings of the present specification, and are for purposes of facilitating the explanation of the aspects of the present invention and simplifying the description, and do not explicitly or implicitly refer to devices or elements that must have, be constructed and operated in, the particular orientation, and therefore such orientation or positional relationship terms are not to be construed or interpreted as limiting aspects of the present invention.
In some embodiments, the fine filtering mechanism may include a filter element disposed between the first cyclone mechanism and the second axial end of the housing, for filtering air passing through the first cyclone mechanism, and the filter element may have the passage disposed therein, which may direct or reverse flow air to enable air to be discharged from the different outlets. In some embodiments, the outlet of the air flow path may be provided at the second axial end of the housing or at the non-axial end of the housing, depending on the arrangement of the channels. When the outlet of the air flow path is provided in the middle of the housing, the inside of the filter element may be formed with a folded passage so that the air is folded after filtration and discharged through the outlet. When the outlet of the air flow path is provided at the second axial end of the housing, the middle portion of the cartridge may form a passage through which air is directed, facilitating air to be discharged directly from the outlet at the second axial end.
Next, the structure and operation principle of the general-type air precleaner according to the present invention will be described with reference to the structure of fig. 1 and the direction of the flow path of air.
After the air containing the dust enters the general-purpose air precleaner, the axial flow fan 10 is started to achieve pressurization. After the air has increased in flow rate by the axial fan 10, it moves downstream along the inner wall of the housing, again swirling the air through the blades 21 and moving in the separation chamber 18.
The dust having a large weight by centrifugal force will move downstream along the spiral of the inner wall of the housing and be discharged through the first dust discharge port 20, and the separated air is filtered again with high accuracy through the filter element (filter medium) in the fine filter mechanism 16, so that clean air is obtained at the outlet 12. During this time, the seal cap 15 ensures sealing.
In some embodiments, the structure of the universal air precleaner can be divided into multiple sections and corresponding housing structures can be provided for ease of production and maintenance. In one application scenario, the housing may include a first housing, a second housing, and a third housing disposed extending along a longitudinal axis. In the case structure provided in fig. 1, the first case 24 is provided with an outlet of the axial flow fan harness 14 for facilitating the energization operation of the axial flow fan. The second housing 22 is used to form a transition chamber, and the swirling mechanism and the fine filter mechanism are disposed in the third housing 17. Further, a fourth housing 19 may be provided at the second axial end to realize dust discharge treatment. The fourth housing 19 is provided with at least one first dust discharge opening 20, and the shape of the first dust discharge opening 20 may be set as required. In some embodiments, the first dust exhaust 20 may implement an active dust exhaust process. In the operating state, the internal air pressure at the first dust discharge port 20 is greater than the external air pressure, so that dust can be ejected from the cavity formed by the fourth housing 19 in a spray form. Therefore, a normally closed valve can be added at the mouth of the first dust exhaust port 20, and is normally closed in a shutdown state and is normally open in a startup state. Furthermore, a normally closed valve is not added, and the valve state is always set to be normally open.
The first casing 24, the second casing 22, the third casing 17, and the fourth casing 19 may be connected by one or more of bolts, clips, threads, buckles, etc., so as to ensure tightness in practical application. The composition, number and form of the housing parts of the air precleaner can be selected and arranged according to actual requirements.
As shown in fig. 1, 2 and 3, a second dust discharge port 30 is formed in a side wall of the first casing 24, a cyclone dust removing blade 28 is rotatably mounted in the first casing 24 around an axis extending up and down, specifically, a rotating shaft 27 is fixedly mounted on the axial fan 10, the cyclone dust removing blade 28 is fixedly mounted on the rotating shaft 27, and the axial fan 10 and the cyclone dust removing blade 28 are synchronously rotated through the rotating shaft 27. When the cyclone dust removing blades 28 rotate, a cyclone flow can be formed in the first shell 24, large-particle dust in the air in the first shell 24 advances spirally, and the large-particle dust is thrown out of the first shell 24 through the second dust discharging port 30 under the action of centrifugal force, so that coarse filtration is realized.
As shown in fig. 3, the cyclone dust removing blade 28 includes a wiper blade 281 at the radially outer end, and further includes a support rib 282 connecting the wiper blade 281 and the rotation shaft 27, and the number and arrangement of the support ribs 282 may be arbitrarily set as required. The wiper blade 281 is arranged obliquely, and the tangential direction of the wiper blade 281 is provided with an included angle different from 0, so that large-particle dust can be better pulled towards the second dust discharge opening 30. Wherein the number of cyclone dust removal blades 28 may be one, two or more. A rectifying vane 31 is fixedly installed on the rotation shaft 27, and the rectifying vane 31 can prevent turbulence from being generated in the first housing 24. As shown in fig. 2, the cross section of the rectifying vane 31 is L-shaped.
As shown in fig. 2 and 3, a flow guide cover 29 is installed at the inlet of the first housing 24, the flow guide cover 29 is in a shape of a top tip and a bottom tip, and the upper end of the flow guide cover 29 is in a tip, so that after air enters the first housing 24, the flow guide cover 29 can form a flow field which diffuses outwards and is concentrated around the inner wall of the first housing 24. The air guide cover 29 allows air to be concentrated mainly around the inner wall of the first housing 24, not in the middle of the first housing 24, which avoids the increase in resistance caused by turbulence generated by the air flow being blocked by the duct of the outlet 12.
In order to avoid the formation of a vacuum cavity between the cyclone dust removing blades 28 and the air guide sleeve 29 after the cyclone dust removing blades 28 rotate, the bottom of the air guide sleeve 29 is an arc bottom end 32, the top of the cyclone dust removing blades 28 is also arc-shaped, the bottom of the air guide sleeve 29 and the top of each cyclone dust removing blade 28 are mutually matched, the gap between the two is reduced, and the vacuum cavity is avoided. Wherein, the first housing 24 is a straight cylinder, and the orifice plate protection net can be added at the upper end of the first housing 24.
In use, the axial flow fan 10 is started, and the air containing impurities passes through the orifice protection net to isolate the impurities with ultra-large volume such as straw, and then the flow guide passing through the flow guide cover 29 is concentrated on the inner wall of the first shell 24 and flows downwards. The axial flow fan 10 drives the cyclone dust removing blades 28 to rotate, the air forms rotational flow and then carries out dust separation of the first stage, large-particle dust is discharged through the second dust discharging port 30, air containing certain impurities flows downwards along the inner wall of the second shell 22 after passing through the axial flow fan 10, the air forms rotational flow again through the blades 21 and flows in the separation cavity 18, the dust with larger weight flows downwards along the inner wall of the third shell 17 in a spiral manner under the action of centrifugal force, the air is discharged through the first dust discharging port 20, the separated air is filtered again with high precision through the fine filtering mechanism 16, clean air is obtained at the outlet 12, and the sealing end cover 15 ensures sealing during the process.
Wherein at least one of the second dust discharge ports 30 is provided. The deformation can also be performed, for example, a normally closed valve is added at the second dust exhaust port 30, and is normally closed in a shutdown state, and after startup, because the internal air pressure is greater than the external air pressure, the dust is ejected out of the cavity in an ejection mode, namely, the dust is in a normally open state after startup.
The end of the pod 29 may be an arcuate end as shown in fig. 4, in addition to a tip.
The motor of the axial flow fan 10 is exposed in a high dust environment for a long time, so that dust is accumulated on the surface of the motor to prevent heat dissipation from affecting the performance of the motor, and the motor of the axial flow fan 10 can be protected by adding a primary filtering system in front of the axial flow fan 10, and the system has several forms: in the form of a straight through, counter-flow swirl tube, vane swirl, saxophone, etc., comprising a primary filter means including cyclone dust removal vanes 28 disposed prior to the axial fan 10.
From the foregoing, it will be appreciated that the use of the terms "first" or "second" and the like in this specification for reference to a number or ordinal number is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Such as a first housing, a second housing, a third housing, a fourth housing, etc. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present specification, the meaning of "plurality" means at least two, for example, two, three or more, etc., unless explicitly defined otherwise.
Example 2 of the universal air precleaner provided by the invention:
the difference from example 1 is that:
as shown in fig. 5, the first housing 24 has a small inner diameter at both ends and a large inner diameter in the middle, and the second dust discharge port 30 is provided in a portion of the first housing 24 having a large inner diameter, and the inlet and outlet have a small inner diameter.
Air enters the first shell 24 through the air inlet, the space becomes large after entering the inside of the first shell 24, the air flow expands, the flowing speed of the air becomes slow, and the air is prevented from directly passing through the first shell 24 without throwing out large-particle dust. The space becomes smaller when the air after dust removal passes through the air outlet again, the air flowing speed becomes fast, and the air can flow downstream rapidly.
Example 3 of the universal air precleaner provided by the invention:
the difference from the above embodiment is that:
in the above embodiments, the cyclone dust removing blades 28 and the axial flow fan 10 are integrated, and the axial flow fan 10 rotates and drives the cyclone dust removing blades 28 to rotate. In this embodiment, the cyclone dust removing blades are individually equipped with a motor fixedly installed in the first housing.
Embodiments of the dust extraction filter assembly provided by the invention:
the dust-removing filter assembly includes a dust-removing housing, an axial flow fan, and cyclone dust-removing blades, which are constructed in accordance with any one of embodiments 1 to 3 of the above-described general-purpose air precleaner, wherein the dust-removing housing is the first housing in this embodiment.
While various embodiments of the present invention have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in practicing the invention. The appended claims are intended to define the scope of the invention and to cover such modular compositions, equivalents, or alternatives falling within the scope of the claims.
Claims (3)
1. A dust extraction filter assembly, comprising:
a dust-discharging housing for providing a flow path of air, having an inlet through which air enters and an outlet through which air flows out, the side wall of the dust-discharging housing being provided with a dust-discharging port;
an axial flow fan provided in the dust discharge housing for pressurizing air entering the dust discharge housing to guide the air from the inlet to the outlet;
the cyclone dust removing blades are rotationally arranged at the upstream of the axial flow fan and are used for enabling air to form a cyclone so as to enable impurities in the air to be thrown out of the dust discharging shell through the dust discharging opening under the action of centrifugal force, and the dust discharging opening is positioned at the upstream of the axial flow fan and is used for removing dust from the air at the upstream of the axial flow fan; the cyclone dust removing blades are fixedly arranged on the axial flow fan through a rotating shaft, so that the axial flow fan drives the cyclone dust removing blades to rotate, and the axial flow fan is electrified to run;
the rotating shaft is also provided with a rectifying blade, the section of the rectifying blade is L-shaped, and the rectifying blade is positioned at the downstream of the cyclone dust removing blade;
the inlet of the dust exhaust shell is provided with a guide cover, and the guide cover is used for enabling air to form an outward diffusion flow field and concentrate around the inner wall of the dust exhaust shell after the air enters the dust exhaust shell; the kuppe is located the upper reaches of whirlwind dust removal blade, and the bottom of kuppe is the circular arc bottom, and whirlwind dust removal blade's top is also the arc, and the bottom of kuppe and the top of each whirlwind dust removal blade are mutually adapted, and the clearance between reduces, avoids producing the vacuum chamber.
2. The dust extraction filter assembly of claim 1, wherein the inlet of the dust extraction housing is of reduced diameter configuration to reduce the flow rate of air after it has passed through the inlet.
3. A universal air precleaner, comprising:
a housing extending along a longitudinal axis between a first axial end and a second axial end for providing a flow path for air, the housing providing an inlet to the air flow path at the first axial end, a dust exhaust port being provided on a side wall of the housing;
an axial fan for pressurizing air entering the housing to direct air from a first axial end to a second axial end of the housing;
the cyclone dust removing blades are rotationally arranged at the upstream of the axial flow fan and are used for enabling air to form rotational flow so as to enable impurities in the air to be thrown out of the shell through the dust discharging port under the action of centrifugal force, the dust discharging port is positioned at the upstream of the axial flow fan and is used for removing dust from the air at the upstream of the axial flow fan, and the cyclone dust removing blades are fixedly arranged on the axial flow fan through a rotating shaft so that the axial flow fan drives the cyclone dust removing blades to rotate; the axial flow fan is electrified to run; the rotating shaft is also provided with a rectifying blade, the section of the rectifying blade is L-shaped, and the rectifying blade is positioned at the downstream of the cyclone dust removing blade; the inlet of the shell is provided with a guide cover, the guide cover is used for enabling air to form an outward diffusion flow field and concentrate around the inner wall of the shell after the air enters the shell, the guide cover is positioned at the upstream of the cyclone dust removing blades, the bottom of the guide cover is an arc bottom end, the top of the cyclone dust removing blades is also arc-shaped, the bottom of the guide cover and the top of each cyclone dust removing blade are mutually matched, the gap between the guide cover and the top of each cyclone dust removing blade is reduced, and a vacuum cavity is avoided;
a first swirling mechanism provided downstream of the axial flow fan for swirling air to separate the air from impurities by centrifugal force;
the fine filtering mechanism is arranged at the second axial end part in the shell and is used for filtering air passing through the first rotational flow mechanism, a channel for enabling air to flow directly or reversely is arranged in the fine filtering mechanism, and the channel is connected with an outlet of an air flow path arranged on the shell.
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CN116358093B (en) * | 2023-06-01 | 2023-08-18 | 河南迅博机械有限公司 | Air dust separation device |
CN117959848A (en) * | 2024-03-29 | 2024-05-03 | 河南迅博机械有限公司 | Active separation air filtration system |
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CN110871003A (en) * | 2018-08-31 | 2020-03-10 | 广东美的白色家电技术创新中心有限公司 | A air purifier that is used for air purification's purifier and has it |
CN112295319A (en) * | 2019-08-02 | 2021-02-02 | 孙正和 | Filter device |
CN114100289A (en) * | 2021-06-30 | 2022-03-01 | 中原内配集团智能装备有限公司 | Oil mist dust remover |
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