CN113757884A - Large-scale furred ceiling air cleaner casing - Google Patents

Large-scale furred ceiling air cleaner casing Download PDF

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Publication number
CN113757884A
CN113757884A CN202111105227.9A CN202111105227A CN113757884A CN 113757884 A CN113757884 A CN 113757884A CN 202111105227 A CN202111105227 A CN 202111105227A CN 113757884 A CN113757884 A CN 113757884A
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CN
China
Prior art keywords
casing
plate
filter
ceiling air
block
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Granted
Application number
CN202111105227.9A
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Chinese (zh)
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CN113757884B (en
Inventor
石永
乔方敬
张国祥
陈安强
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Jiangsu Zhongjin New Energy Technology Co ltd
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Jiangsu Zhongjin New Energy Technology Co ltd
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Priority to CN202111105227.9A priority Critical patent/CN113757884B/en
Publication of CN113757884A publication Critical patent/CN113757884A/en
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Publication of CN113757884B publication Critical patent/CN113757884B/en
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F8/00Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying
    • F24F8/10Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering
    • F24F8/108Treatment, e.g. purification, of air supplied to human living or working spaces otherwise than by heating, cooling, humidifying or drying by separation, e.g. by filtering using dry filter elements
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/20Casings or covers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/28Arrangement or mounting of filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/32Supports for air-conditioning, air-humidification or ventilation units
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y02A50/2351Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Disinfection, Sterilisation Or Deodorisation Of Air (AREA)

Abstract

The invention relates to the technical field of large-scale ceiling air purifiers and discloses a large-scale ceiling air purifier casing which comprises a purifier, wherein the periphery of the purifier is fixedly provided with a casing, the front surface of the casing is fixedly connected with a support frame, the bottom of the casing is fixedly provided with a support rod, and the inner wall of the casing is provided with a filter tank. This large-scale furred ceiling air cleaner casing, through the front of restriction board card on the set-square at the support frame, thereby the effect of installing the casing fast has been reached, through the inside that the sliding plate is continuous with the outside air in the inner wall in slide bar groove takes the casing, thereby the effect of suction air has been reached, harmful substance through in the effectual deaerate, thereby the effect of harmful substance in the deaerate has been reached, the magnetic hook of inhaling through the filter top can be under the effect of extension board, to the casing attraction, thereby the effect of installing the filter fast has been reached.

Description

Large-scale furred ceiling air cleaner casing
Technical Field
The invention relates to the technical field of large-scale ceiling air purifiers, in particular to a large-scale ceiling air purifier shell.
Background
An air cleaner, also known as an air cleaner, an air freshener, or a purifier, is a product capable of adsorbing, decomposing, or converting various air pollutants, including PM2.5, dust, pollen, odor, formaldehyde, and other decoration pollutants, bacteria, allergens, and the like, thereby effectively improving air cleanliness, and is mainly classified into household, commercial, industrial, and building products. The existing air purifier is mostly of a composite type, namely, a plurality of purification technologies and material media are adopted at the same time.
The prior art has the following defects and shortcomings: the most structure of traditional air cleaner casing is comparatively simple, generally relies on and locks, connects through the bolt in many places, when carrying out the dismouting to the casing, needs take off the bolt in proper order and install, and the dismouting is inconvenient, efficiency is lower, so has certain limitation.
Present air purifier carries out filterable in-process at the inhaled air, to dust, sulfur dioxide, oxynitrides, carbon monoxide, ozone in the air, purifying effect is lower, can't last the purification to chemical harmful substance in the air, when needing to dismantle the clearance, dismantles inconveniently, the clearance difficulty.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a large-scale ceiling air purifier casing which can solve the problem of the existing large-scale ceiling air purifier casing, and the problems of quick installation of the casing, air extraction, harmful substance removal and quick installation of a filter plate are effectively solved.
In order to realize the purpose of the large-scale ceiling air purifier shell, the invention provides the following technical scheme: the utility model provides a large-scale furred ceiling air cleaner casing, includes the clearing machine, the peripheral fixed mounting of clearing machine has the casing, the positive fixedly connected with support frame of casing, the bottom fixed mounting of casing has the bracing piece, the filter-tank has been seted up to the inner wall of casing, the positive fixedly connected with main screw rod of bracing piece.
Preferably, the front of casing is provided with the pressing block, the top fixedly connected with slide to one side of pressing block, the one end sliding connection who keeps away from the pressing block of slide to one side has extension spring, extension spring keeps away from the one end rotation that slide to one side is connected with the rotation screw rod, the peripheral fixed mounting of casing has the fixed plate, the front of fixed plate is rotated and is connected with the set-square, the front of set-square is rotated and is connected with the limiting plate, the back sliding connection of set-square has the spout.
Preferably, the front face of the purifier of the casing is provided with four sets, and the front face of each set of casing is provided with two sets of triangular plates and limiting plates.
Preferably, the top fixed mounting of bracing piece has a choke piece and a hose, the bottom fixedly connected with spout of hose, the bottom fixed mounting of bracing piece has the filter cell.
Preferably, the nozzles and the filter tank are arranged in two groups and are arranged at the upper end and the lower end of the choke block.
Preferably, a filter plate is arranged inside the filter tank, a first permanent magnet is fixedly mounted at the bottom of the filter plate, a second permanent magnet is movably connected at the bottom of the first permanent magnet, a reset spring is fixedly connected at the bottom of the second permanent magnet, a stretching plate is fixedly mounted at the top of the filter plate, and a magnetic attraction hook is fixedly connected at one end, close to the casing, of the stretching plate.
Preferably, the magnetic block is arranged on the front face of the magnetic hook, and the casing is made of metal.
Preferably, the front surface of the main screw rod is rotatably connected with a rotating gravity block, the periphery of the rotating gravity block is slidably connected with a sliding rod, the top of the sliding rod is fixedly provided with a sliding plate, and the back surface of the sliding plate is provided with a sliding rod groove.
Preferably, the front face of the rotating weight block is generally a metal weight block.
Compared with the prior art, the invention provides a large-scale ceiling air purifier casing which has the following beneficial effects:
1. according to the large-scale ceiling air purifier shell, the shell is arranged, the pressing block and the inclined sliding plate are manually controlled to slide inwards on the extension spring, the extension spring drives the rotating screw rod to rotate, the rotating screw rod drives the triangular plate to perform meshing motion, the limiting plate on the front side of the triangular plate moves to reach the front side of the supporting frame, the shell on one side is stabilized on the supporting frame, and four groups of shells are controlled to be stabilized on the supporting frame, so that the effect of rapidly installing the shell is achieved;
2. according to the large-scale ceiling air purifier shell, the main screw rod is arranged, the two groups of rotating gravity blocks on the front side are driven to rotate through the rotation of the main screw rod, the rotating gravity blocks drive the sliding rod and the sliding plate to move, and the sliding plate brings external air into the sliding plate, so that the effect of air suction is achieved;
3. the large-scale suspended ceiling air purifier casing is provided with a wind resistance block, a nozzle and a filter plate, wherein the wind resistance block 41 is driven by a built-in driving device to carry out a heating reaction, carbon monoxide in air is oxidized into carbon dioxide when passing through overheated copper oxide, a saturated sodium bicarbonate solution is sprayed from the interior of a hose by the nozzle, the sulfur dioxide reacts with the sodium bicarbonate solution to generate carbon dioxide so as to achieve the aim of removing sulfur dioxide, a layer of methane is formed on the surface of the filter plate, the methane catalyzes and reduces oxynitride, H4(g) +4NO2(g) +4NO (g) + CO2(g) +2H2O (g) delta H-574 kJ/mol CH4(g) +4NO (g) + 2N2(g) + CO2(g) +2H2O (g) delta H1160 kJ/mol, and the CH4 reduces NO2 into a thermochemical equation of N2, thereby achieving the effect of removing harmful substances in the air;
4. this large-scale furred ceiling air cleaner casing through setting up the filter tank, places the inside of filter tank through filter 51, and the permanent magnetic path of second of the bottom of filter tank can be in the same place with the first permanent magnetic path inter attraction of filter bottom, and the magnetic hook of filter top can be in the same place with the inner wall inter attraction of casing to the effect of installing the filter fast has been reached.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic view of the housing and the connecting structure thereof according to the present invention;
FIG. 3 is a schematic view of a support rod and its connection structure according to the present invention;
FIG. 4 is an enlarged view of the structure at A in FIG. 3 according to the present invention;
FIG. 5 is a schematic view of the filter plate and its connection structure of the present invention;
FIG. 6 is a schematic view of the main screw and its connection structure according to the present invention.
In the figure: 1. a purifier; 2. a housing; 21. a pressing block; 22. an inclined slide plate; 23. an extension spring; 24. rotating the screw; 25. a fixing plate; 26. a set square; 27. a limiting plate; 28. a chute; 3. a support frame; 4. a support bar; 41. a wind resistance block; 42. a hose; 43. a spout; 44. a filter cell; 5. a filter tank; 51. a filter plate; 52. a first permanent magnet block; 53. a second permanent magnet block; 54. a return spring; 55. stretching the plate; 56. a magnetic hook; 6. a main screw; 61. rotating the gravity block; 62. a slide bar; 63. a sliding plate; 64. a slide bar groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 6, a large-scale ceiling air purifier casing includes a purifier 1, a casing 2 is fixedly installed on the periphery of the purifier 1, a support frame 3 is fixedly connected to the front of the casing 2, a support rod 4 is fixedly installed at the bottom of the casing 2, a filter tank 5 is disposed on the inner wall of the casing 2, a main screw 6 is fixedly connected to the front of the support rod 4, and is clamped on the front of the support frame 3 by a limiting plate 27 on a triangular plate 26, so as to achieve the effect of rapidly installing the casing 2, the external air is continuously brought into the casing 2 by the inner wall of a slide rod groove 64 through a sliding plate 63, so as to achieve the effect of sucking air, dust in the air at the two ends of a wind blocking block 41 is adsorbed on water drops and dropped on the filter tank 44, and flows out from the filter tank 44, so as to achieve the effect of filtering air, a magnetic hook 56 at the top of a filter plate 51 is under the action of a stretching plate 55, attracting the cabinet 2, thereby achieving the effect of quickly mounting the filter plate 51.
Casing 2's front is provided with press block 21, press block 21's top fixedly connected with slide plate 22 to one side, slide plate 22 keeps away from press block 21's one end sliding connection has extension spring 23, extension spring 23 keeps away from slide plate 22's one end and rotates and be connected with rotation screw rod 24, casing 2's peripheral fixed mounting has fixed plate 25, fixed plate 25's front is rotated and is connected with set-square 26, set-square 26's front is rotated and is connected with limiting plate 27, set-square 26's back sliding connection has spout 28, limiting plate 27 card through on set-square 26 is in the front of support frame 3, thereby the effect of quick installation casing 2 has been reached. The casing 2 is provided with four groups in the front of the purifier 1, and the front of each group of casing 2 is provided with two groups of set squares 26 and limiting plates 27, and the limiting plates 27 on the front of the set squares 26 are clamped on the support frame 3, so that the effect that the casing 2 is fixed on the purifier 1 is achieved. The top fixed mounting of bracing piece 4 has choke block 41 and hose 42, the bottom fixedly connected with spout 43 of hose 42, the bottom fixed mounting of bracing piece 4 has filter tank 44, get rid of through the harmful gas with in the air to play air-purifying's effect, spout 43 and filter tank 44 are provided with two sets ofly altogether, and all at the upper and lower both ends of choke block 41, when playing the purification, with the effect that both ends were purified to the air dispersion. The inside of filter tank 5 is provided with filter 51, the bottom fixed mounting of filter 51 has first permanent magnet 52, the bottom swing joint of first permanent magnet 52 has second permanent magnet 53, the bottom fixedly connected with reset spring 54 of second permanent magnet 53, the top fixed mounting of filter 51 has stretching plate 55, stretching plate 55 is close to the one end fixedly connected with magnetism hook 56 of casing 2, magnetism hook 56 through the filter 51 top can be under stretching plate 55's effect, attract to casing 2, thereby the effect of installing filter 51 fast has been reached. The magnetic block is arranged on the front face of the magnetic hook 56, and the casing 2 is made of metal, so that the effect of automatic clamping when the filter plate 51 is placed in the filter tank 5 is achieved. The front of the main screw rod 6 is rotatably connected with a rotating gravity block 61, the periphery of the rotating gravity block 61 is slidably connected with a sliding rod 62, the top of the sliding rod 62 is fixedly provided with a sliding plate 63, the back of the sliding plate 63 is provided with a sliding rod groove 64, and the sliding plate 63 continuously brings outside air to the inside of the machine shell 2 on the inner wall of the sliding rod groove 64, so that the air suction effect is achieved. The front surface of the rotating gravity block 61 is generally a metal gravity block, and the gravity block has an effect of driving the sliding plate 63 to slide up and down on the inner wall of the sliding rod groove 64.
In summary, when the pressing block 21 and the inclined sliding plate 22 are manually controlled to slide inwards on the extension spring 23, the extension spring 23 drives the rotary screw 24 to rotate, the rotary screw 24 drives the triangular plate 26 to perform meshing motion, the limiting plate 27 on the front surface of the triangular plate 26 moves to reach the front surface of the supporting frame 3, the machine shell 2 on one side is stabilized on the supporting frame 3, four groups of machine shells are controlled to be stabilized on the supporting frame 3, thereby achieving the effect of rapidly installing the machine shell 2, the two groups of rotary gravity blocks 61 on the front surface are driven to rotate through the rotation of the main screw 6, the rotary gravity blocks 61 drive the sliding rods 62 and the sliding plates 63 to move, the sliding plates 63 bring the external air to the inside, thereby achieving the effect of sucking the air, the air blocking block 41 is driven by the built-in driving device to perform heating reaction, and carbon monoxide in the air passes through the overheated copper oxide, carbon monoxide is oxidized into carbon dioxide, a saturated sodium bicarbonate solution is sprayed from the interior of the hose 42 by the nozzle 43, the sulfur dioxide reacts with the sodium bicarbonate solution to generate carbon dioxide so as to remove the sulfur dioxide, then a layer of methane is formed on the surface of the filter plate 51, the methane catalyzes and reduces oxynitride, H4(g) +4NO2(g) ═ 4NO (g) + CO2(g) +2H2O (g) < delta > H </delta > 574kJ/mol CH4(g) +4NO (g) < 2N2(g) + CO2(g) +2H2O (g) < delta > H </delta > 1160kJ/mol, and the CH4 reduces NO2 into N2, so that the effect of removing harmful substances in the air is achieved, the filter plate 51 is placed in the filter tank 5, and the second permanent magnet 53 at the bottom of the filter tank 5 and the first permanent magnet 52 at the bottom of the filter plate 51 attract each other, the magnetic attraction hook 56 on the top of the filter plate 51 attracts the inner wall of the housing 2, so as to achieve the effect of quickly mounting the filter plate 51.
The working and using process and the installation method of the invention are that, when the machine shell 2 of the large-scale suspended ceiling air purifier is used, the press block 21 is pressed on the front surface of the machine shell 2 by arranging the machine shell 2, the press block 21 can drive the inclined sliding plate 22 to slide on the extension spring 23, because the inclined sliding plate 22 is of a structure with a narrow top and a wide bottom, the inclined sliding plate 22 can drive the extension spring 23 to extrude the rotating screw 24, so that the rotating screw 24 rotates, the rotating screw 24 rotates to drive the peripheral triangular plate 26 to follow the movement, and because one end of the triangular plate 26 far away from the rotating screw 24 is rotatably connected on the fixed plate 25, the triangular plate 26 can drive the limiting plate 27 on the front surface to rotate on the fixed plate 25 to be close to the support frame 3, the chute 28 on the back surface of the triangular plate 26 drives the triangular plate 26 to move to the support frame 3, the limiting plate 27 on the triangular plate 26 is clamped on the front surface of the support frame 3, thereby, the effect of rapidly installing the casing 2 is achieved, when the air is purified by the purifier 1, the built-in driving device of the purifier 1 can drive the main screw rod 6 to rotate, the rotating gravity block 61 on the main screw rod 6 can drive the sliding rod 62 and the sliding plate 63 to continuously move up and down, the sliding plate 63 continuously brings the external air to the inside of the casing 2 on the inner wall of the sliding rod groove 64, thereby achieving the effect of sucking the air, the wind blocking block 41 performs a heating reaction under the driving of the built-in driving device, when the carbon monoxide in the air passes through the overheated copper oxide, the carbon monoxide is oxidized into carbon dioxide, the nozzle 43 sprays saturated sodium bicarbonate solution from the inside of the hose 42, the sulfur dioxide can react with the sodium bicarbonate solution to generate the carbon dioxide, thereby achieving the purpose of removing the sulfur dioxide, and then a layer of methane is generated on the surface of the filtering plate 51, methane catalytic reduction oxynitride, H4(g) +4NO2(g) ═ 4NO (g) + CO2(g) +2H2O (g) · Δ H ═ -574 kJ/mol CH4(g) +4NO (g) ═ 2N2(g) + CO2(g) +2H2O (g) · Δ H ═ -1160 kJ/mol CH4 reduces NO2 to a thermochemical equation of N2, thereby achieving the effect of removing harmful substances in the air, and after the purification, a part of the air is also purified again through the filter plate 51, when the filter plate 51 is mounted, the filter plate 51 is vertically placed inside the filter tank 5, the first permanent magnet block 52 at the bottom of the filter plate 51 and the second permanent magnet block 53 on the return spring 54 attract each other, and the magnetic hook 56 at the top of the filter plate 51 attracts the cabinet 2 by the action of the stretching plate 55, thereby achieving the effect of rapidly mounting the filter plate 51.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (9)

1. The utility model provides a large-scale furred ceiling air cleaner casing which characterized in that: including clearing machine (1), the peripheral fixed mounting of clearing machine (1) has casing (2), the positive fixedly connected with support frame (3) of casing (2), the bottom fixed mounting of casing (2) has bracing piece (4), filter-tank (5) have been seted up to the inner wall of casing (2), the positive fixedly connected with owner screw rod (6) of bracing piece (4).
2. The large ceiling air purifier cabinet of claim 1, wherein: the front of casing (2) is provided with according to briquetting (21), the top fixedly connected with slide (22) to one side of according to briquetting (21), the one end sliding connection who keeps away from according to briquetting (21) of slide (22) has extension spring (23), the one end that slide (22) were kept away from in extension spring (23) is rotated and is connected with rotation screw rod (24), the peripheral fixed mounting of casing (2) has fixed plate (25), the front of fixed plate (25) is rotated and is connected with set-square (26), the front of set-square (26) is rotated and is connected with limiting plate (27), the back sliding connection of set-square (26) has spout (28).
3. The large ceiling air purifier housing of claim 2, wherein: the front face of the purifier (1) of the casing (2) is provided with four groups, and the front face of each group of casing (2) is provided with two groups of triangular plates (26) and limiting plates (27).
4. The large ceiling air purifier cabinet of claim 1, wherein: the top fixed mounting of bracing piece (4) has choke block (41) and hose (42), the bottom fixedly connected with spout (43) of hose (42), the bottom fixed mounting of bracing piece (4) has filter tank (44).
5. The large ceiling air cleaner housing of claim 4, wherein: the nozzles (43) and the filter tanks (44) are arranged in two groups and are arranged at the upper end and the lower end of the choke block (41).
6. The large ceiling air purifier cabinet of claim 1, wherein: the novel magnetic filter is characterized in that a filter plate (51) is arranged inside the filter tank (5), a first permanent magnetic block (52) is fixedly mounted at the bottom of the filter plate (51), a second permanent magnetic block (53) is movably connected at the bottom of the first permanent magnetic block (52), a reset spring (54) is fixedly connected at the bottom of the second permanent magnetic block (53), a stretching plate (55) is fixedly mounted at the top of the filter plate (51), and a magnetic suction hook (56) is fixedly connected at one end, close to the casing (2), of the stretching plate (55).
7. The large ceiling air cleaner housing of claim 6, wherein: the front surface of the magnetic hook (56) is provided with a magnetic block, and the casing (2) is made of metal.
8. The large ceiling air purifier cabinet of claim 1, wherein: the front surface of the main screw rod (6) is rotatably connected with a rotating gravity block (61), the periphery of the rotating gravity block (61) is slidably connected with a sliding rod (62), the top of the sliding rod (62) is fixedly provided with a sliding plate (63), and the back surface of the sliding plate (63) is provided with a sliding rod groove (64).
9. The large ceiling air cleaner housing of claim 8, wherein: the front surface of the rotating gravity block (61) is generally a metal gravity block.
CN202111105227.9A 2021-09-22 2021-09-22 Large-scale furred ceiling air purifier casing Active CN113757884B (en)

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CN113757884B CN113757884B (en) 2024-03-15

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