High-speed suction and blowing dual-purpose all-in-one machine

Abstract

The utility model discloses a high-speed suction and blowing dual-purpose all-in-one machine which comprises a shell, a plurality of blowing nozzles and a high-pressure dust suction device, a cavity is formed in the shell, a first opening and a second opening are formed in the two sides of the cavity respectively, an air inlet cover is arranged in the first opening, a first air inlet is formed in the second opening, a dust cup is connected to one side of the shell in a screwed mode, and a dust outlet is formed in the other side of the shell. The air inlet cover comprises an outer ring body and an inner ring body, a plurality of third air inlets are annularly formed in the end face of the outer ring body, a round hole is formed in the center of the outer ring body, an inwards-concave inner ring body is arranged in the round hole, a plurality of air outlets are annularly formed in the end face of the inner ring body, and a plurality of air outlets are formed in the end face of the outer ring body. Two clamping blocks and two magnetic blocks are arranged on the inner side face of the inner ring body, the side edge of each blowing nozzle is provided with an L-shaped limiting groove connected with the corresponding clamping block in a screwed mode, the side edge of each L-shaped limiting groove is provided with an insertion notch, and the side face of each blowing nozzle is further provided with a metal sheet matched with the corresponding magnetic block in a magnetic mode. The structure is convenient to disassemble the blowing nozzle.

Description

Technical Field

[0001] The utility model belongs to the related technical field of dust suction equipment, and particularly relates to a high-speed suction and blowing dual-purpose integrated machine. Background Technique

[0002] Compared with general vacuum cleaners, hand-held wireless vacuum cleaners pay more attention to small volume and portability, especially for small household and in-vehicle vacuum cleaners, where the requirements for volume and weight are more stringent; most of the such vacuum cleaners on the market at present have a single function and only have the function of dust suction. Especially for in-vehicle vacuum cleaners, people have more requirements for functions. Therefore, there is a multifunctional hand-held wireless vacuum cleaner disclosed in Patent No. 202021724084.0, including a vacuum cleaner body, which has an air inlet and an air outlet. An inflation adapter is installed on the air outlet of the vacuum cleaner body, and an inflation nozzle is installed on the inflation adapter. The inflation nozzle is connected to the air outlet through the inflation adapter; a vacuum bag suction nozzle is provided on the first air inlet of the vacuum cleaner body, and the vacuum bag suction nozzle is used to communicate with the connection nozzle on the vacuum bag; an air inlet end is also installed on the first air inlet, and a second air inlet is provided on the air inlet end. Although this structure can achieve the functions of blowing and dust suction, this structure needs to use an inflation adapter to replace different blowing nozzles, and the blowing nozzle adopts a combined structure. Judging from the figure, the blowing nozzle and the adapter adopt a common socket connection method. Since the air pressure is high during blowing, it is necessary to ensure the tightness of the socket between the blowing nozzle and the inflation adapter. If it is too loose, the blowing nozzle is easily blown out. If it is too loose, the blowing nozzle cannot be sleeved outside the inflation adapter, resulting in high processing requirements for the blowing nozzle. Therefore, in order to solve the installation problem of the blowing nozzle, a high-pressure suction motor cannot be used, and ultimately the dust suction effect is not ideal. Therefore, improvement is needed. Content of the Utility Model

[0003] The purpose of the utility model is to provide a high-speed suction and blowing dual-purpose integrated machine, which solves the problems of unsatisfactory dust suction effect and unreliable installation of the blowing nozzle in the existing blow-suction integrated vacuum cleaner.

[0004] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0005] The utility model relates to a high-speed suction and blowing dual-purpose integrated machine, which includes a housing and more than one blowing nozzle. The functional structures of each blowing nozzle are different. A cavity is arranged inside the housing, and a high-pressure dust suction device is arranged in the cavity. A first opening and a second opening are respectively arranged on both sides of the cavity. An air inlet cover is arranged in the first opening, and a first air inlet is arranged at the second opening. A dust cup is rotatably connected to the outside of the second opening on one side of the housing. The other end of the dust cup is plugged with a flat-mouth suction nozzle. One end of the flat-mouth suction nozzle is provided with a second air inlet connected to the first air inlet. The air inlet cover includes an outer ring body and an inner ring body. A round hole is arranged at the center of the outer ring body, and an inwardly concave inner ring body is arranged in the round hole. More than one air outlet is annularly arranged on the end face of the inner ring body. Two symmetric clamping blocks and two symmetric magnetic blocks are arranged on the inner side face of the inner ring body. An L-shaped limiting groove rotatably connected to the clamping block is arranged on the side of each blowing nozzle. An insertion notch for facilitating the insertion of the clamping block is arranged on the side of the L-shaped limiting groove. A metal sheet magnetically matched with the magnetic block is also arranged on the side of each blowing nozzle. When the blowing nozzle is screwed tightly in the L-shaped limiting groove, the magnetic block just fits and magnetically attracts the metal sheet together.

[0006] Preferably, a handle is arranged below the housing. A controller electrically connected to the high-pressure dust suction device and a lithium battery for supplying power to the device are arranged in the handle. Anti-slip convex strips are arranged on the handle. A USB interface for charging the lithium battery is arranged at the bottom of the handle. A start switch is arranged on the handle.

[0007] Preferably, in order to realize lighting, more than one lighting group is arranged on the housing. The lighting group is electrically connected to the controller. Each lighting group includes more than one LED lamp bead connected in series. A lighting switch is arranged on the handle.

[0008] Preferably, to realize solar power supply, a flexible solar panel electrically connected to the lithium battery is also arranged on the handle.

[0009] Preferably, a closing plate for closing the second air inlet is hinged in the dust cup. Two positioning holes are arranged on the closing plate. A positioning rod inserted into the positioning holes is arranged in the dust cup.

[0010] Preferably, to facilitate the disassembly of the brush for cleaning the brush, a brush holder is sleeved on the head of the flat-mouth suction nozzle. A plurality of brush holes distributed along the opening shape of the brush holder are arranged on the end face of the brush holder far from the flat-mouth suction nozzle. A brush rod is detachably plugged on each brush hole. A brush strip is arranged on the brush rod.

[0011] Preferably, an air inlet ring is arranged in the first air inlet, and a conical filter screen is sleeved outside the air inlet ring.

[0012] Preferably, it is convenient to disassemble. The conical filter screen includes a circular ring seat, a metal extension platform is arranged inside the circular ring seat, a magnetic ring is arranged on the air inlet ring, and the metal extension platform and the magnetic ring.

[0013] The utility model has the following beneficial effects: The blowing nozzle and the air inlet cover of this structure adopt double fixation of screwing and magnetic attraction, which improves the fixation effect and avoids loosening and falling. When replacement is needed later, only need to hold the blowing nozzle and rotate it in the opposite direction to quickly disassemble and replace the blowing nozzle. And a high-pressure dust suction device can be adopted inside, which can ensure that the blowing nozzle will not be blown off and can further improve the dust suction effect. Description of the Drawings

[0014] Figure 1 Schematic diagram of the structure of the high-speed suction and blowing dual-purpose machine in Example 1 without the blowing nozzle installed Figure 1 ;

[0015] Figure 2 Schematic diagram of the structure of the high-speed suction and blowing dual-purpose machine in Example 1 without the blowing nozzle installed Figure 2 ;

[0016] Figure 3 For Figure 1 Schematic diagram of the structure without the dust cup and the flat mouth suction nozzle installed;

[0017] Figure 4 For Figure 3 Schematic diagram of the structure when the conical filter screen, the air inlet ring and other components are separated;

[0018] Figure 5 Schematic diagram of the structure of the conical filter screen;

[0019] Figure 6 Schematic diagram of the structure when the air inlet cover and other components are separated when the high-speed suction and blowing dual-purpose machine in Example 1 has no blowing nozzle installed;

[0020] Figure 7 Schematic diagram of the structure of the air inlet cover in Example 1;

[0021] Figure 8 Schematic diagram of the structure when the upper cover is hidden when the high-speed suction and blowing dual-purpose machine in Example 1 has no blowing nozzle installed;

[0022] Figure 9 Schematic diagram of the structure of the blowing nozzle for blowing balloons in Example 1 Figure 1 ;

[0023] Figure 10 Schematic diagram of the structure of the blowing nozzle for blowing balloons in Example 1 Figure 2 ;

[0024] Figure 11 Schematic structural diagram of the long strip blowing nozzle in Example 1;

[0025] Figure 12 Schematic structural diagram of the multifunctional blowing nozzle in Example 1;

[0026] Figure 13 Schematic structural diagram of the blowing nozzle for inflating a lifebuoy in Example 1;

[0027] Figure 14 Schematic diagram of the structure of the large plate brush in Example 1 Figure 1 ;

[0028] Figure 15 Schematic diagram of the structure of the large plate brush in Example 1 Figure 2 ;

[0029] Figure 16 Schematic diagram of the structure of the high-speed suction and blowing dual-purpose machine without the blowing nozzle installed in Example 2 Figure 1 ;

[0030] Figure 17 Schematic diagram of the structure of the high-speed suction and blowing dual-purpose machine without the blowing nozzle installed in Example 2 Figure 2 ;

[0031] Figure 18 Schematic diagram of the structure of the dust cup in Example 3 Figure 1 ;

[0032] Figure 19 Schematic diagram of the structure of the dust cup in Example 3 Figure 2 ;

[0033] Figure 20 Schematic structural diagram of the closing plate in Example 4;

[0034] Figure 21 Schematic structural diagram of the brush holder in Example 4;

[0035] Figure 22 Schematic structural diagram of one brush rod in Example 4.

[0036] Reference numerals: housing 1, cavity 101, first opening 1011, second opening 1012, blowing nozzle 2, L-shaped limiting groove 201, insertion notch 202, metal sheet 203, high-pressure dust suction device 3, first air inlet 4, dust cup 5, closing plate 501, positioning hole 502, positioning rod 503, hinge seat 504, hinge shaft 505, flat mouth suction nozzle 6, second air inlet 7, air inlet cover 8, outer ring body 801, inner ring body 802, magnetic block 803, round hole 804, air outlet 805, clamping block 806, handle 9, lighting switch 901, controller 10, lithium battery 11, anti-slip rib 12, USB interface 13, lighting group 14, LED lamp bead 15, flexible solar panel 16, brush holder 17, brush hole 18, brush rod 19, brush strip 20, air inlet ring 21, conical filter screen 22, ring seat 221, metal extension platform 222, magnetic ring 211, start switch 23, large board brush 24. Detailed implementation manners

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] Embodiment 1

[0039] Please refer to Figure 1 - 15As shown in the figure, the high-speed suction and blowing dual-purpose integrated machine disclosed in this embodiment includes a housing 1 and more than one blowing nozzle 2. The functional structures of each blowing nozzle 2 are different. A cavity 101 is provided inside the housing 1, and a high-pressure dust suction device 3 is provided inside the cavity 101. It should be noted that the high-pressure dust suction device 3 includes a high-pressure brushless motor and a dust suction fan driven by the motor, and both the dust suction fan and the high-pressure brushless motor can be purchased. Moreover, the inner walls of the cavity 101 are all of a closed structure. Therefore, high-pressure dust suction on one side and high-pressure air outlet on the other side are realized to achieve the final air injection function. A first opening 1011 and a second opening 1012 are respectively provided on both sides of the cavity 101. An air inlet hood 8 is provided in the first opening 1011, a first air inlet 4 is provided at the second opening 1012, a dust cup 5 is rotatably connected to the outside of the second opening 1012 on one side of the housing 1, a flat-mouth suction nozzle 6 is inserted into the other end of the dust cup 5, and a second air inlet 7 connected to the first air inlet 4 is provided at one end of the flat-mouth suction nozzle 6. The air inlet hood 8 includes an outer ring body 801 and an inner ring body 802. More than one third air inlet 803 is annularly provided on the end face of the outer ring body 801, a circular hole 804 is provided at the center of the outer ring body 801, and an inwardly concave inner ring body 802 is provided in the circular hole 804. More than one air outlet 805 is annularly provided on the end face of the inner ring body 802, and two symmetric clamping blocks 806 and two symmetric magnetic blocks 803 are provided on the inner side surface of the inner ring body 802. An L-shaped limiting groove 201 rotatably connected to the clamping block 806 is provided on the side of each blowing nozzle 2, and an insertion notch 202 facilitating the insertion of the clamping block 806 is provided on the side of the L-shaped limiting groove 201. A metal sheet 203 magnetically matched with the magnetic block 803 is also provided on the side of each blowing nozzle 2. When the blowing nozzle 2 is screwed tightly in the L-shaped limiting groove 201, the magnetic block 803 just fits and magnetically attracts with the metal sheet 203. In this embodiment, the housing 1 is composed of an upper cover and a lower cover that are buckled with each other, and the upper cover and the lower cover are fixed by screws.

[0040] In this embodiment, there are four blowing nozzles 2. One is for blowing balloons; one is for blowing life jackets; one is a multi-functional blowing nozzle, and the head of the multi-functional blowing nozzle has multiple diameters of different sizes that can be connected to air-blowing devices of different calibers; the other is a long blowing nozzle with a relatively small caliber, so it is used for blowing air-blowing devices with a small caliber.

[0041] Preferably, a handle 9 is provided below the housing 1. A controller 10 electrically connected to the high-pressure dust suction device 3 and a lithium battery 11 for powering the device are provided inside the handle 9. Anti-slip ridges 12 are provided on the handle 9. A USB interface 13 for charging the lithium battery 11 is provided at the bottom of the handle 9. A start switch 23 is provided on the handle 9. During operation, when the start switch 23 is pressed, the device operates, and the high-pressure dust suction device 3 operates to drive the suction fan to rotate. At this time, air enters through the second air inlet 7 on the right side of the housing 1. After the dust is inhaled and filtered by the conical filter screen 22, the dust is left in the dust cup 5. After the high-pressure air enters through the first air inlet 4 and forms a negative pressure inside the housing 1, it is discharged from the air outlet 805, achieving the function of dust suction. The controller 10 belongs to conventional technology. How the controller 10 is electrically connected to the USB interface 13, the lithium battery 11, and the high-pressure dust suction device 3 are all conventional technical means, so no specific description is made here.

[0042] In this embodiment, the flat mouth suction nozzle 6 at the front end of the dust cup 5 can also be replaced with a large plate brush 24. The large plate brush 24 has a structure with both ends connected in the center. One end of the large plate brush 24 is inserted into the opening of the dust cup 5, and the other end of the large plate brush 24 can be snap-connected to large bristles later to achieve a large-range brushing operation, and the dust suction diameter is larger.

[0043] Preferably, in order to achieve lighting, more than one set of lighting groups 14 are provided on the housing 1. In this embodiment, two sets of lighting groups 14 are provided on both the front and rear of the housing 1 to improve the lighting effect. The lighting groups 14 are electrically connected to the controller 10. Each set of lighting groups 14 includes more than one LED lamp bead 15 connected in series. A lighting switch 901 is provided on the handle 9 to achieve temporary lighting operation at night by adding the lighting switch 901.

[0044] Preferably, an air inlet ring 21 is provided inside the first air inlet 4, and a conical filter screen 22 is sleeved outside the air inlet ring 21. Adding the conical filter screen 22 inside serves to filter dust.

[0045] Preferably, for easy disassembly, the conical filter screen 22 includes a circular ring seat 221. A metal extension platform 222 is provided inside the circular ring seat 221. A magnetic ring 211 is provided on the air inlet ring 21. The metal extension platform 222 is attracted to the magnetic ring 211, and the conical filter screen 22 and the air inlet ring 21 are magnetically connected, which is convenient for later disassembly.

[0046] The specific working principle of this structure is as follows: When used for dust suction, the high-pressure dust suction device 3 operates, driving the dust suction fan to rotate. At this time, air enters through the second air inlet 7 on the right side of the housing 1. After the dust is sucked in and filtered through the conical filter net 22, the dust is left in the dust cup 5. The high-pressure air enters through the first air inlet 4 and generates a strong negative pressure inside the housing 1 and then is discharged from the air outlet 805, realizing the function of dust suction. When it is necessary to be used for blowing, directly screw-connect a blowing nozzle 2 with a corresponding function at the position of the air inlet cover 8. After inserting the clamping block 806 into the insertion notch 202 on the blowing nozzle 2, then hold the blowing nozzle 2 and rotate the blowing nozzle 2 to make the clamping block 806 snap into the L-shaped limiting groove 201. At this time, ensure that the magnetic block 803 just attracts and combines with the metal sheet 203 to realize the fixation of the blowing nozzle 2. Then start the high-pressure dust suction device 3 to operate, driving the dust suction fan to rotate. At this time, air enters through the second air inlet 7 on the right side of the housing 1. The high-pressure air enters through the first air inlet 4 and generates a strong negative pressure inside the housing 1 and then is discharged from the air outlet 805 at high pressure. After being gathered by the blowing nozzle 2, it inflates the corresponding device to be inflated. Therefore, the blowing nozzle 2 and the air inlet cover 8 of this structure adopt double fixation of screw connection and magnetic attraction, improving the fixation effect and avoiding loosening and falling. When it needs to be replaced later, only need to hold the blowing nozzle 2 and rotate the blowing nozzle 2 in the opposite direction to realize quick disassembly and replacement of the blowing nozzle 2. Moreover, a high-pressure dust suction device 3 can be adopted inside to ensure that the blowing nozzle 2 will not be blown off and can further improve the dust suction effect.

[0047] Embodiment 2

[0048] Please refer to Figure 16 - 17 As shown, the high-speed suction and blowing dual-purpose integrated machine disclosed in this embodiment, as a preference, realizes solar power supply. A flexible solar panel 16 electrically connected to the lithium battery 11 is also provided on the handle 9. By adding the flexible solar panel 16, solar power supply can be realized. And in this embodiment, the flexible solar panel 16 belongs to an existing product that can be purchased, so no specific description will be made here. Moreover, the technology of how the flexible solar panel 16 is connected to the lithium battery 11 to convert solar energy into electric energy belongs to the conventional technology in this field, so no specific description will be made here. At the same time, the flexible solar panel 16 is two pieces, which are respectively fixed on both sides inside the handle 9.

[0049] Embodiment 3

[0050] Please refer to Figure 18 - 20As shown in the figure, the high-speed suction and blowing dual-purpose integrated machine disclosed in this embodiment, preferably, a closing plate 501 for closing the second air inlet 7 is hinged in the dust cup 5. Two positioning holes 502 are provided on the closing plate 501. A positioning rod 503 inserted into the positioning holes 502 is provided in the dust cup 5. In this structure, two hinge seats 504 are arranged up and down in the dust cup 5. Hinge shafts 505 inserted into the hinge seats 504 are arranged above and below the closing plate 501, and the positioning holes 502 are far away from the hinge shafts 505. When the high-pressure dust suction device 3 works, the wind enters from the second air inlet 7. Under the high pressure, the closing plate 501 rotates inward to open, ensuring that the second air inlet 7 is communicated with the inside of the dust cup 5, allowing the wind to enter from the second air inlet 7, so as to realize that the dust enters from the second air inlet 7. When the high-pressure dust suction device 3 does not work, the external force disappears. At this time, the closing plate 501 automatically closes (because the mass of the closing plate 501 is relatively light), avoiding the problem that the dust stored in the dust cup 5 is poured out from the second air inlet 7. When the dust in the dust cup 5 needs to be cleaned later, the dust cup 5 can be directly unscrewed from the housing 1 to clean the dust. This structure further solves the problem that the dust is easily poured out from the air inlet currently.

[0051] Embodiment 4

[0052] Please refer to Figure 21 - 22 As shown in the figure, the high-speed suction and blowing dual-purpose integrated machine disclosed in this embodiment, preferably, is convenient for disassembling the brush and cleaning the brush. A brush holder 17 is sleeved on the head of the flat mouth suction nozzle 6. A plurality of brush holes 18 distributed along the opening shape of the brush holder 17 are provided on the end face of the brush holder 17 away from the flat mouth suction nozzle 6. A brush rod 19 is detachably inserted into each brush hole 18. A brush strip 20 is provided on the brush rod 19. With the above structure, each brush rod 19 can be separately disassembled later to separately clean the brush strip 20 or replace the whole brush rod 19. When in use, a brush rod 19 is inserted into each brush hole 18, so that the front end of the brush holder 17 forms a brush. At the same time, the opening at the rear end of the brush holder 17 is inserted outside the head of the flat mouth suction nozzle 6. The center of the brush holder 17 serves as a dust suction port for sucking dust or garbage, and the front-end brush is used for brushing operation.

[0053] The above are only the preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions recorded in the foregoing embodiments, any equivalent replacement of some technical features, and any modification, equivalent replacement, and improvement made all fall within the protection scope of the present invention.

Claims

1. A high-speed suction and blowing dual-purpose integrated machine, comprising a shell (1) and more than one blowing nozzle (2), each blowing nozzle (2) having a different functional structure, a cavity (101) being arranged in the shell (1), a high-pressure dust suction device (3) being arranged in the cavity (101), a first opening (1011) and a second opening (1012) being arranged on both sides of the cavity (101), an air inlet cover (8) being arranged in the first opening (1011), a first air inlet (4) being arranged at the second opening (1012), a dust cup (5) being screwed on the outer side of the second opening (1012) on one side of the shell (1), a flat-mouthed suction nozzle (6) being plugged into the other end of the dust cup (5), a second air inlet (7) connected to the first air inlet (4) being arranged at one end of the flat-mouthed suction nozzle (6), and the second air inlet (7) connected to the first air inlet (4), characterized in that: The air inlet hood (8) comprises an outer ring body (801) and an inner ring body (802), wherein a circular hole (804) is arranged at the center of the outer ring body (801), an inner ring body (802) which is concave inwardly is arranged in the circular hole (804), one or more air outlets (805) are arranged in an annular shape on the end surface of the inner ring body (802), two symmetrical clamping blocks (806) and two symmetrical magnetic blocks (803) are arranged on the inner side surface of the inner ring body (802), and each air blowing The side of the nozzle (2) is provided with an L-shaped limit groove (201) which is screwed to the clamping block (806), and the side of the L-shaped limit groove (201) is provided with an insertion notch (202) for facilitating the insertion of the clamping block (806). A metal sheet (203) which is magnetically matched with the magnetic block (803) is also provided on the side of each blowing nozzle (2), and when the blowing nozzle (2) is screwed into the L-shaped limit groove (201), the magnetic block (803) fits the metal sheet (203) and is magnetically attracted together.

2. The high-speed suction and blowing dual-purpose machine according to claim 1, characterized in that: A handle (9) is arranged below the housing (1), a controller (10) electrically connected to the high-pressure dust suction device (3) and a lithium battery (11) for powering the device are arranged inside the handle (9), an anti-slip convex strip (12) is arranged on the handle (9), a USB interface (13) for charging the lithium battery (11) is arranged at the bottom of the handle (9), and a start switch (23) is arranged on the handle (9).

3. The high-speed suction and blowing dual-purpose machine according to claim 2, characterized in that: One or more lighting groups (14) are arranged on the housing (1), and the lighting groups (14) are electrically connected to the controller (10). Each lighting group (14) includes one or more LED lamp beads (15) connected in series, and a lighting switch (901) is arranged on the handle (9).

4. The high-speed suction and blowing dual-purpose machine according to claim 2, characterized in that: A flexible solar light panel (16) electrically connected to the lithium battery (11) is also provided on the handle (9).

5. The high-speed suction and blowing dual-purpose integrated machine according to claim 1, characterized in that: A closing plate (501) is hingedly connected in the dust cup (5) to close the second air inlet (7). The closing plate (501) Two positioning holes (502) are arranged on the dust cup (5), and a positioning rod (503) is arranged in the dust cup (5) and is inserted into the positioning hole (502).

6. The high-speed suction and blowing dual-purpose machine according to claim 1, characterized in that: A brush holder (17) is sleeved on the head of the flat-mouth suction nozzle (6), and a plurality of brush holes (18) distributed along the opening shape of the brush holder (17) are arranged on the end surface of the brush holder (17) away from the flat-mouth suction nozzle (6), and a brush rod (19) is detachably plugged into each brush hole (18), and a brush strip (20) is arranged on the brush rod (19).

7. The high-speed suction and blowing machine according to claim 2, characterized in that: An air inlet ring (21) is arranged inside the first air inlet (4), and a conical filter screen (22) is connected to the outer shell of the air inlet ring (21).

8. The high-speed suction and blowing machine according to claim 7, characterized in that: The conical filter screen (22) comprises a circular ring seat (221), a metal extension platform (222) is arranged inside the circular ring seat (221), a magnetic ring (211) is arranged on the air inlet ring (21), and the metal extension platform (222) is attracted to the magnetic ring (211).

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