CN213885441U - Air purifier for filtering novel coronavirus - Google Patents

Abstract

The application relates to an air purifier for filtering novel coronavirus, which comprises a hollow case, wherein an air draft device is arranged in the case, the side wall of the case is provided with an air inlet and an air outlet, the air inlet of the case is provided with meltblown, the side wall of the case is provided with a fan cover for covering the air inlet, and the inner side of the fan cover is provided with a pressure rod for compressing the meltblown; the fan cover comprises a cover frame and a cover blade arranged on the cover frame in a sliding mode, the cover frame is provided with a wind gathering port, and the cover blade covers the wind gathering port; the cover frame is provided with a guide rail, and the edge of the cover blade is connected with the guide rail in a sliding manner. This application passes the melt-blown cloth through pumping indoor gas to with most bacterium in the air, the surface at the melt-blown cloth of the particulate matter separation more than 0.3 mu m such as novel coronavirus, have and carry out filterable effect to indoor air, and the filter effect is good.

Description

Air purifier for filtering novel coronavirus

Technical Field

The invention relates to the field of indoor air purification, in particular to an air purifier for filtering novel coronavirus.

Background

The novel coronavirus is a newly discovered coronavirus causing high-contagious respiratory infection and is named SARS-Cov-2 by the International Committee for viral Classification. The population is generally susceptible because of the lack of immunity to the novel viral strains. Caused by SARS-Cov-2 coronavirus, the disease caused by SARS-Cov-2 infection is named COVID-19 by WHO, and most infections can cause pneumonia, so the disease is called new coronavirus pneumonia/new coronary pneumonia.

In the initial stages of an outbreak of a new type of coronavirus, the virus is spread into the surrounding air and enters through the respiratory system of the infected person, mainly by wearing a mask to prevent the virus carrier from flying through saliva.

With the gradual improvement of the epidemic situation in China, the re-work and the re-production are promoted in China, and places such as markets, restaurants, schools, factories and the like are gradually opened. However, in the indoor environment, especially in the shopping malls, restaurants and offices with dense staff, wearing the mask brings more inconvenience, and because the indoor air circulation is generally poor, the novel coronavirus is easily carried in the indoor air, and the risk of infection is increased by taking off the mask.

SUMMERY OF THE UTILITY MODEL

In order to improve the phenomenon that the wearing of a mask brings inconvenience when indoor, the application provides an air purifier for filtering novel coronavirus.

The application provides an air purifier for filtering novel coronavirus adopts following technical scheme:

an air purifier for filtering novel coronavirus comprises a hollow case, wherein an air draft device is arranged in the case, the side wall of the case is provided with an air inlet and an air outlet, the air inlet of the case is provided with melt-blown fabric, the side wall of the case is provided with a fan cover for covering the air inlet, and the inner side of the fan cover is provided with a pressure rod for compressing the melt-blown fabric;

the fan cover comprises a cover frame and a cover blade arranged on the cover frame in a sliding mode, the cover frame is provided with a wind gathering port, and the cover blade covers the wind gathering port; the cover frame is provided with a guide rail, and the edge of the cover blade is connected with the guide rail in a sliding manner.

By adopting the technical scheme, when the novel air purifier is used, indoor air is pumped into the case by the air draft device in the case, when the air passes through the melt-blown cloth from the air inlet of the case and enters the case, the melt-blown cloth has a filtering effect on the air and blocks most of pollutants such as bacteria, viruses and the like in the air on the surface of the melt-blown cloth, the filtered air is blown out through the air outlet of the case, the blown air is fresh air, and the content of the novel coronavirus in the indoor air is reduced; the melt-blown fabric is compressed by the compression bar, so that the melt-blown fabric is not easy to deviate in the working process of the purifier; the cover leaf slides with the cover frame and is connected to thereby the pulling cover leaf opens the cover frame, and then changes and clears up the melt-blown fabric.

Preferably, the cover frame is internally provided with a winding and unwinding device for winding and unwinding the meltblown fabric.

Through adopting above-mentioned technical scheme, receive unwinding device and receive and release the roll to the melt-blown fabric to realize changing the melt-blown fabric that is used for blockking air intake department.

Preferably, receive unwinding device including rotate set up in the wind-up roll and the unreeling roller of cover frame, wind-up roll and unreeling roller parallel arrangement, the one end of melt-blown fabric is convoluteed in unreeling roller, the other end convolute in the wind-up roll, be provided with in the cover frame and be used for supporting the supporting component of unreeling roller, still be provided with in the cover frame and be used for the drive wind-up roll pivoted drive assembly.

By adopting the technical scheme, the unused melt-blown fabric is rolled and sleeved on the unwinding roller, and one end of the melt-blown fabric is pulled to the winding roller and wound on the winding roller, so that the melt-blown fabric section between the unwinding roller and the winding roller covers the air inlet of the case; when the melt-blown fabric section between the unwinding roller and the winding roller is replaced, the winding roller is driven by the driving assembly to rotate, the melt-blown fabric is wound in the rotating process of the winding roller, so that the polluted melt-blown fabric is wound, and meanwhile, in the winding process, the melt-blown fabric of the unwinding roller is pulled to be unwound until the new melt-blown fabric covers the air inlet of the case.

Preferably, drive assembly including set up in motor support on the cover frame and set up in driving motor on the motor support, driving motor's output shaft has gear motor, gear motor's output shaft detachably connect in the wind-up roll, the one end that gear motor was kept away from to the wind-up roll be provided with connect in the coupling assembling of cover frame.

Through adopting above-mentioned technical scheme, driving motor's output shaft connection gear motor to reduce the slew velocity of wind-up roll, thereby make the process of rolling more stable.

Preferably, the connecting assembly comprises a shaft seat arranged on the cover frame and a positioning pin telescopically arranged on the shaft seat, the positioning pin extends and retracts along the length direction of the winding roller, a positioning groove for the insertion of the positioning pin is formed in one end, far away from the speed reduction motor, of the winding roller, and the winding roller can rotate relative to the positioning pin when the positioning pin is inserted and matched with the positioning groove.

Through adopting above-mentioned technical scheme, the locating pin is connected to the one end of wind-up roll, and gear motor is connected to the other end, plays the effect that supports to the wind-up roll from this, and dismantles thereby when the wind-up roll is changed and is convoluteed the fine hair cloth that spouts on the wind-up roll, can pull the locating pin so that the locating pin withdraws from the constant head tank, and the locating pin steps down the wind-up roll to make things convenient for the dismantlement of wind-up roll, so that change the melt-blown cloth on the wind-up roll.

Preferably, the shaft seat is provided with a first spring, the positioning pin is sleeved with the first spring, one end of the first spring abuts against the shaft seat, and the other end of the first spring is connected to the positioning pin.

Through adopting above-mentioned technical scheme, first spring provides elasticity to the locating pin to make the locating pin can keep pegging graft in the constant head tank.

Preferably, an output shaft of the speed reducing motor is provided with a driving pin, and one end of the winding roller, which is far away from the positioning pin, is provided with a slot which is in plug-in fit with the driving pin.

Through adopting above-mentioned technical scheme, drive round pin and slot grafting cooperation are driven by gear motor drive round pin and are rotated to the drive wind-up roll rotates, so that the wind-up roll realizes the rolling.

Preferably, the supporting component comprises a supporting plate arranged in the cover frame and a hook groove arranged in the supporting plate, the two ends of the unwinding roller are provided with rotating parts, and the rotating parts rotate and are borne in the hook groove.

Through adopting above-mentioned technical scheme, the both ends of unreeling the roller bear in the catching groove through the rotation portion, play the effect of support to unreeling the roller from this.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when the air-purifying device is used, indoor air is pumped into the case by the air draft device in the case, when the air passes through the melt-blown cloth from the air inlet of the case and enters the case, the melt-blown cloth has a filtering effect on the air and blocks most of pollutants such as bacteria, viruses and the like in the air on the surface of the melt-blown cloth, the filtered air is blown out through the air outlet of the case, and the blown air is fresh air;

2. when the melt-blown fabric section between the unwinding roller and the winding roller is replaced, the winding roller is driven by the driving assembly to rotate, the melt-blown fabric is wound in the rotating process of the winding roller, so that the melt-blown fabric after being polluted is wound, and meanwhile, in the winding process, the melt-blown fabric of the unwinding roller is pulled to be unwound until new melt-blown fabric covers the air inlet of the case, so that the melt-blown fabric is replaced.

Drawings

FIG. 1 is a schematic overall structure diagram of the first embodiment;

fig. 2 is a schematic view illustrating an assembly relationship between a fan housing and a chassis in the first embodiment;

FIG. 3 is a schematic view illustrating an assembled relationship between a mask frame and a mask blade according to an embodiment of the present invention;

FIG. 4 is a schematic view showing the assembly relationship between the support plate and the unwinding roller in the first embodiment;

FIG. 5 is a schematic view showing the assembly relationship between the wind-up roll and the driving pin in the first embodiment;

FIG. 6 is a schematic view showing an assembly relationship between a wind-up roll and a positioning pin in the first embodiment;

FIG. 7 is a schematic view of a connection structure between the cover frame and the unwinding roller in the second embodiment;

FIG. 8 is a schematic view showing the assembly relationship between the unwinding roller and the supporting plate in the second embodiment;

fig. 9 is a side view of the third mask frame of the present embodiment.

Description of reference numerals: 1. a chassis; 101. an air inlet; 102. an air outlet; 103. blocking strips; 2. a support portion; 3. an exhaust fan; 4. a fan housing; 41. a cover frame; 42. a cover leaf; 411. an air collection port; 412. a guide rail; 413. a carrier strip; 5. melt-spraying cloth; 6. unwinding rollers; 61. a rotating part; 62. a clamping groove; 611. a sliding shaft; 612. a clamping convex block; 613. a limiting plate; 7. a wind-up roll; 71. a limiting clamping groove; 8. a pressure lever; 9. a support plate; 91. hooking a groove; 92. a yielding groove; 10. a motor bracket; 11. a drive motor; 12. a reduction motor; 13. a drive pin; 131. a limiting clamping block; 14. a shaft seat; 15. positioning pins; 16. a first spring; 17. a pull rod; 18. a heating roller; 19. a spring plate; 191. a connecting portion.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The first embodiment is as follows:

an intelligent indoor air purifier for filtering novel coronavirus, referring to fig. 1, comprises a hollow case 1, wherein the case 1 is approximately rectangular. Four supporting parts 2 for supporting the case 1 are installed at the bottom of the case 1, and the four supporting parts 2 are respectively positioned at four corners of the bottom of the case 1. The support part 2 may be a support leg or a roller.

Referring to fig. 1 and 2, an air inlet 101 and an air outlet 102 are formed in a side wall of the chassis 1, and both the air inlet 101 and the air outlet 102 penetrate through the inside of the chassis 1. The number of the air inlets 101 may be one or multiple, and the size and the number of the air inlets 101 may be set according to actual requirements. In this embodiment, the number of the air inlets 101 is three, the three air inlets 101 are respectively located on three side walls of the circumferential direction of the chassis 1, and the air inlets 101 are provided with barrier strips 103. The case 1 is provided with a louver for shielding the air outlet 102, so that the air outlet 102 of the case 1 is blocked, and the impurity garbage is reduced from entering the case 1. An exhaust fan 3 is installed inside the case 1, and a blowing port of the exhaust fan 3 faces an air outlet 102 of the case 1.

Referring to fig. 2 and 3, a fan housing 4 for covering the air inlet 101 is installed on the chassis 1, the fan housing 4 includes a housing frame 41, the housing frame 41 is formed by four surrounding plates, and an air collecting opening 411 is formed on one side of the housing frame 41 away from the chassis 1. The frame cover is slidably connected with a cover blade 42 for covering the air collecting opening 411, the cover blade 42 is a louver, and the cover blade 42 can slide up and down relative to the cover frame 41.

Specifically, referring to fig. 3, two parallel guide rails 412 are installed on the cover frame 41, the two guide rails 412 are arranged along the vertical direction, and the two guide rails 412 are respectively located at two opposite sides of the air collection opening 411. Two opposite sides of the cover blade 42 are slidably connected to the two guide rails 412 respectively.

Referring to fig. 3, a horizontal bearing strip 413 is installed at the bottom of the cover frame 41, and the bearing strip 413 is used for bearing the bottom of the cover blade 42 and preventing the cover blade 42 from sliding downwards due to gravity. Meanwhile, pulling the cover blade 42 upward can open the air collecting opening 411, thereby facilitating the cleaning and maintenance of the inside of the cabinet 1 by personnel.

Referring to fig. 3, a meltblown 5 for covering the air inlet 101 of the chassis 1 is installed in the cover frame 41, and the meltblown 5 is a medical-grade meltblown 5. Specifically, the meltblown 5 is a single layer meltblown 5, and the thickness of the meltblown 5 is between 0.015mm and 0.03mm, preferably 0.02 mm. When gas is purified, air is pumped into the case 1 from the air inlet 101 of the case 1, the meltblown 5 blocks most of bacteria and viruses and particles with the particle size of more than 0.3 μm contained in the air on the surface of the meltblown 5, and meanwhile, the bacteria, the viruses and the particles are adsorbed by static electricity on the surface of the meltblown 5, so that the pumped air is filtered, and the filtering efficiency of the purifier reaches more than 90% through tests.

Referring to fig. 3, the upper side and the lower side of the cover frame 41 are respectively rotatably provided with an unwinding roller 6 and a winding roller 7, the unwinding roller 6 and the winding roller 7 are arranged in parallel, and the unwinding roller 6 is located above the winding roller 7. One end of the meltblown 5 is wound around the unwinding roll 6, and the other end is wound around the winding roll 7. In this embodiment, a supporting component for supporting the unwinding roller 6 is installed in the cover frame 41, and a driving component for driving the winding roller 7 to rotate is also installed in the chassis 1. During the use, overlap roll-like meltblown 5 on unreeling roller 6 to draw meltblown 5's one end to wind up-roll 7 on and around wind up-roll 7, the meltblown 5 section between unreeling roller 6 and wind up-roll 7 covers the air intake 101 of quick-witted case 1, thereby filters the gas that gets into from the air intake 101 of quick-witted case 1. When the meltblown fabric 5 between the unwinding roller 6 and the winding roller 7 reaches the replacement condition, the winding roller 7 can be driven to wind by the driving assembly, so that the contaminated meltblown fabric 5 is wound to the winding roller 7, and the meltblown fabric 5 wound on the unwinding roller 6 is pulled to the air inlet 101 of the covering case 1.

Referring to fig. 3, in order to stably cover the meltblown 5 at the air inlet 101 of the chassis 1, two pressure rods 8 for pressing the meltblown 5 are further provided in the cover frame 41, and the two pressure rods 8 are respectively located at the upper and lower sides of the cover frame 41. Compress tightly melt-blown fabric 5 at the lateral wall of quick-witted case 1 through depression bar 8 for the in-process melt-blown fabric 5 of convulsions can keep covering the air intake 101 of quick-witted case 1, and is difficult for taking place the off normal.

Specifically, referring to fig. 3 and 4, the support assembly includes two support plates 9, and the two support plates 9 are respectively fixed to both sides of the cover frame 41. An arc-shaped hook groove 91 is formed in the supporting plate 9, and the hook groove 91 is bent towards the winding roller 7. Both ends of the unwinding roller 6 are detachably connected with rotating parts 61, and the rotating parts 61 are rotatably supported on the hook grooves 91. One side of the supporting plate 9 departing from the cabinet 1 is provided with a yielding groove 92 communicated with the hook groove 91 so as to facilitate the disassembly and assembly of the rotating part 61 and facilitate the disassembly and assembly of the unwinding roller 6.

Referring to fig. 4, the rotating portion 61 includes a sliding shaft 611 carried in the hook groove 91, and the sliding shaft 611 is provided along the length direction of the unwinding roller 6. The end of the unwinding roller 6 is provided with a slot (not shown) for the sliding shaft 611 to engage, and a chamfer is provided at one end of the sliding shaft 611 engaging with the slot.

Referring to fig. 3 and 4, two circular position-limiting plates 612 are fixed to the sliding shaft 611, the two position-limiting plates 612 are respectively located on both sides of the support plate 9, and the position-limiting plates 612 limit the sliding shaft 611 to reduce the amount of lateral misalignment of the sliding shaft 611.

Referring to fig. 3 and 5, the driving assembly includes a motor bracket 10 installed in the cover frame 41 and a driving motor 11 installed on the motor bracket 10, and the driving motor 11 is electrically connected with a controller for controlling the start of the jackscrew of the driving motor 11. An output shaft of the driving motor 11 is connected with a speed reducing motor 12, an output shaft of the speed reducing motor 12 is fixedly connected with a driving pin 13 through a bolt, the driving pin 13 is arranged in a conical shape, and a large opening end of the driving pin 13 is connected with an output shaft of the speed reducing motor 12. The end of the winding shaft is provided with a slot (not shown in the figure) for inserting the driving pin 13, the wall of the slot is uniformly provided with four limiting clamping grooves 71 along the circumferential direction of the winding roller 7, and the side wall of the driving pin 13 is provided with a limiting clamping block 131 in clamping fit with the limiting clamping grooves 71.

Referring to fig. 6, one end of the wind-up roll 7 away from the speed reduction motor 12 is provided with a connecting assembly connected with the cover frame 41. The connecting assembly comprises a shaft seat 14 installed in the cover frame 41 and a positioning pin 15 telescopically installed on the shaft seat 14, and the positioning pin 15 can extend and contract along the length direction of the winding roller 7. The end of the positioning pin 15 facing the speed reducing motor 12 is provided with a chamfer, the end of the wind-up roll 7 far away from the speed reducing motor 12 is provided with a positioning groove (not shown in the figure) for the small-mouth end of the positioning pin 15 to be inserted, and after the positioning pin 15 is inserted and matched with the positioning groove, the side wall of the positioning pin 15 tightly abuts against the groove wall of the positioning groove.

In addition, referring to fig. 6, a pull rod 17 is rotatably connected to one end of the positioning pin 15 away from the speed reduction motor through a bearing 151, and the pull rod 17 is arranged along the length direction of the winding shaft 7. The pull rod 17 is sleeved with a first spring 16 for providing elastic force to the positioning pin 15, one end of the first spring 16 is connected to the positioning pin 15, and the other end is connected to the shaft seat 14. The first spring 16 provides an elastic force to the positioning pin 15 so that the positioning pin 15 is stably inserted into the positioning groove.

The chassis 1 is also provided with a sensor for detecting the concentration of particulate matter in the air. The sensor is electrically connected to the controller, wherein the controller is a single chip microcomputer. The controller is electrically connected with the driving motor. The controller is electrically connected with a delayer, and the delayer is electrically connected with the exhaust fan. When the sensor detects that the content of the particulate matters in the air reaches a first preset threshold value, the sensor sends a detection signal to the controller, and the controller responds to the detection signal and sends a control signal to the driving motor 11 and the time delay unit. The drive motor 11 operates in response to the control signal, and the drive motor 11 operates and starts winding the meltblown 5 to replace the meltblown 5 between the unwinding roll 6 and the winding roll 7. Meanwhile, the delayer responds to the control signal and starts timing, and is preset with preset time, wherein the preset time is the time required by the melt-blown fabric 5 to be replaced. When the time of the time delayer reaches the preset time, the time delayer sends a time delay signal to the exhaust fan 3, and the exhaust fan 3 responds to the time delay signal and starts air exhaust so as to enable air to pass through the meltblown 5 for purification. In the process of air draft and air purification, the time delay timer is started by the exhaust fan. If the air draft purification time reaches three hours, the controller controls the exhaust fan 3 to stop working and controls the driving motor 11 to start to replace the melt-blown fabric 5; when the sensor detects that the content of the particulate matters in the air is lower than a second preset threshold value, the driving motor 11 and the exhaust fan 3 stop working, and the air purifier is in a standby state. It should be noted that, in this embodiment, the first preset threshold and the second preset threshold are both air particulate matter content values, and the first preset threshold is greater than the second preset threshold.

The implementation principle of the first embodiment is as follows: when the novel air filter is used, indoor air is pumped into the case 1 by the exhaust fan 3 in the case 1, when the air passes through the meltblown 5 from the air inlet 101 of the case 1 and enters the case 1, the meltblown 5 filters the air, most particles (including viruses and bacteria including new crown viruses and particles more than 0.3 micron) in the air are blocked on the surface of the meltblown 5, the filtered air is blown out through the air outlet 102 of the case 1, and the blown air is fresh air. When the meltblown fabric 5 reaches the replacement condition, the winding roller 7 is driven to rotate by the driving motor 11, the meltblown fabric 5 is wound by the rotating process of the winding roller 7, so that the contaminated meltblown fabric 5 is wound, and meanwhile, in the winding process, the meltblown fabric 5 of the unwinding roller 6 is pulled to be unwound until the new meltblown fabric 5 covers the air inlet 101 of the case 1, so that the meltblown fabric 5 is replaced.

Example two:

the present embodiment is different from the first embodiment in that the supporting member is different. Specifically, referring to fig. 7 and 8, the support assembly includes two support plates 9, and the two support plates 9 are respectively fixed to both sides of the cover frame 41. An arc-shaped hook groove 91 is formed in the supporting plate 9, and the hook groove 91 is bent towards the winding roller 7. The two ends of the unwinding roller 6 are respectively and rotatably supported in the hook grooves 91 of the two support plates 9. The support plate 9 is provided with a yielding groove 92 communicated with the hook groove 91 so as to facilitate the dismounting of the unreeling roller 6.

In addition, referring to fig. 8, the elastic sheet 19 for carrying the unwinding roller 6 is installed in the hook groove 91, the elastic sheet 19 is in a winding shape, and the bending radian of the elastic sheet 19 is substantially consistent with that of the hook groove 91. One end of the elastic sheet 19 is connected with a connecting part 191, and the connecting part 191 is connected with the side wall of the support plate 9. In this embodiment, the elastic sheet 19 is used for providing damping to the unwinding roller 6, so that the unwinding roller 6 rotates more stably.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. An air purifier for filtering novel coronavirus, characterized in that: including being quick-witted case (1) of cavity setting, its characterized in that: an air draft device is arranged in the case (1), an air inlet (101) and an air outlet (102) are formed in the side wall of the case (1), the melt-blown fabric (5) is arranged at the air inlet (101) of the case (1), a fan cover (4) used for covering the air inlet (101) is arranged on the side wall of the case (1), and a pressing rod (8) used for pressing the melt-blown fabric (5) is arranged on the inner side of the fan cover (4);

the fan cover (4) comprises a cover frame (41) and a cover blade (42) arranged on the cover frame (41) in a sliding mode, the cover frame (41) is provided with a wind gathering port (411), and the cover blade (42) covers the wind gathering port (411); the cover frame (41) is provided with a guide rail (412), and the edge of the cover blade (42) is connected to the guide rail (412) in a sliding mode.

2. An air purifier for filtering a novel coronavirus according to claim 1, wherein: and a winding and unwinding device for winding and unwinding the melt-blown fabric (5) is arranged in the cover frame (41).

3. An air purifier for filtering a novel coronavirus according to claim 2, wherein: receive unwinding device including rotate set up in wind-up roll (7) and the unreeling roller (6) of cover frame (41), wind-up roll (7) and unreeling roller (6) parallel arrangement, the one end of melt-blown fabric (5) is convoluteed in unreeling roller (6), the other end is convoluteed in wind-up roll (7), be provided with in cover frame (41) and be used for supporting unreel the supporting component of roller (6), still be provided with in cover frame (41) and be used for the drive wind-up roll (7) pivoted drive assembly.

4. An air purifier for filtering a novel coronavirus according to claim 3, wherein: drive assembly including set up in motor support (10) on cover frame (41) and set up in driving motor (11) on motor support (10), the output shaft of driving motor (11) is connected with gear motor (12), the output shaft detachably of gear motor (12) connect in wind-up roll (7), wind-up roll (7) keep away from the one end of gear motor (12) be provided with connect in the coupling assembling of cover frame (41).

5. An air purifier for filtering a novel coronavirus according to claim 4, wherein: the connecting assembly comprises a shaft seat (14) arranged on the cover frame (41) and a positioning pin (15) telescopically arranged on the shaft seat (14), the positioning pin (15) stretches along the length direction of the winding roller (7), one end, far away from the speed reduction motor (12), of the winding roller (7) is provided with a positioning groove for the insertion of the positioning pin (15), the positioning pin (15) is in insertion fit with the positioning groove, and the winding roller (7) can rotate relative to the positioning pin (15).

6. An air purifier for filtering a novel coronavirus according to claim 5, wherein: the shaft seat (14) is provided with a first spring (16), the positioning pin (15) is sleeved with the first spring (16), one end of the first spring (16) is abutted against the shaft seat (14), and the other end of the first spring is connected to the positioning pin (15).

7. An air purifier for filtering a novel coronavirus according to claim 4, wherein: an output shaft of the speed reducing motor (12) is provided with a driving pin (13), and one end, far away from the positioning pin (15), of the winding roller (7) is provided with a slot in plug-in fit with the driving pin (13).

8. An air purifier for filtering a novel coronavirus according to claim 3, wherein: the supporting assembly comprises a supporting plate (9) arranged in the cover frame (41) and a hook groove (91) formed in the supporting plate (9), rotating portions (61) are arranged at two ends of the unwinding roller (6), and the rotating portions (61) rotate and bear on the hook groove (91).

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