Air purifier with double-air-duct structure

Abstract

The utility model discloses an air purifier with a double-air-duct structure, which is characterized in that two motors are arranged in the air purifier side by side, and a backward wind wheel is arranged on each motor to form double air ducts; a volute tongue is arranged at an air outlet of the air duct; the air duct upper shell and the air duct lower shell are oppositely arranged, a filter screen is arranged between the air duct upper shell and the two backward wind wheels, an air duct side plate is arranged on the side face of the air duct, and the air duct is defined by the air duct side plate, the air duct upper shell and the air duct lower shell. The air purifier with the double-air-duct structure has the advantages of being high in purification efficiency, low in power consumption, small in size, simple in structure, low in production cost and the like.

Description

Technical Field

[0001] The utility model relates to an air purifier with a double air duct structure, belonging to the technical field of air purification equipment. Background Art

[0002] An air purifier is a device that purifies the air in a continuous cycle. It requires a sufficiently high wind pressure to fully break through the resistance of the filter to form a strong airflow. Traditional air purifiers generally use large motors and large wind wheels to obtain sufficient wind pressure. This method causes the volume of the air purifier to increase significantly, and the vibration of the motor to increase significantly.

[0003] In addition, in order to overcome motor vibration, traditional air purifiers often need to be equipped with a high-strength motor mounting bracket, which leads to increased production costs and increased product weight.

[0004] Due to the above reasons, it is necessary to further study the existing air purifiers in order to solve the above problems. Utility Model Content

[0005] In order to overcome the above problems, the inventors have conducted in-depth research and proposed an air purifier with a dual air duct structure, in which two motors 1 are arranged side by side, and a backward wind wheel 12 is arranged on each of the two motors 1 to form a dual air duct;

[0006] A snail tongue 2 is provided at the air outlet of the air duct;

[0007] A UVC sterilization device 3 and a positive and negative ion sterilization device 4 are arranged in the air duct.

[0008] In a preferred embodiment, two volute tongues 2 are provided at the air outlet of each air duct, and the two volute tongues 2 are axially symmetrical with the motor axis as the symmetry axis.

[0009] In a preferred embodiment, a filter screen 5 is arranged in the air duct.

[0010] In a preferred embodiment, a duct lower shell 61 is provided at the duct inlet end, a duct upper shell 62 is provided at the duct outlet end, a duct side plate 63 is provided on the duct side, and an air detection sensor is provided on the duct side plate 63.

[0011] In a preferred embodiment, the air detection sensor includes a formaldehyde sensor 631 and a dust sensor 632 .

[0012] In a preferred embodiment, the two motors 1 are fixed on the air duct side plate 63 via a bracket, the air duct lower shell 61 is a flat plate, and the air duct lower shell 61 and the air duct side plate 63 are connected via screws.

[0013] In a preferred embodiment, a power adapter 64 is provided on the inner wall of the air duct side plate 63. The power adapter 64 has a sealed housing and is used to convert AC power into 24V DC power.

[0014] The output end of the power adapter 64 is connected to one pin of the micro switch 65, and the other pin of the micro switch 65 is connected to the power access end of the air purifier PCB board 66, so that when the micro switch 65 is turned on, the output end of the power adapter 64 is electrically connected to the power access end of the air purifier PCB board 66; when the micro switch 65 is turned off, the output end of the power adapter 64 is disconnected from the power access end of the air purifier PCB board 66;

[0015] A card slot is provided at the connection position between the inner side of the air duct side plate 63 and the air duct lower shell 61, and the micro switch touch panel is pressed by the card slot. When the air duct side plate 63 is separated from the air duct lower shell 61, the micro switch 65 is separated from the card slot, thereby closing the micro switch.

[0016] The utility model provides an air purifier with a double air duct structure, wherein two motors (1) are arranged side by side inside the air purifier, and a backward wind wheel (12) is arranged on each of the two motors (1) to form a double air duct, and a volute tongue (2) is arranged at the air outlet (633) of the air duct; an upper air duct shell (62) and a lower air duct shell (61) are arranged opposite to each other, and a filter screen (5) is arranged between the upper air duct shell (62) and the two backward wind wheels (12); an air duct side plate (63) is arranged on the side of the air duct, and the air duct side plate (63) and the upper air duct shell (62) and the lower air duct shell (61) are arranged to form the air duct.

[0017] From the perspective of technical effects, compared with the purifier using a high-power rear-facing wind wheel in the prior art, the present application can significantly reduce the vibration of the purifier during operation, reduce noise, and achieve higher purification efficiency by arranging two smaller-power rear-facing wind wheels side by side in the purifier; in addition, compared with the purifier using a forward wind wheel, the air duct of the rear-facing wind wheel does not require an air guide plate to pressurize the airflow, so the air duct volume can be set smaller, which can effectively reduce the volume of the purifier.

[0018] In a feasible embodiment, the air inlet surfaces of the two backward wind wheels (12) are opposite to the filter screen (5), and part of the peripheral side surface of each backward wind wheel is opposite to the air duct side plate (63).

[0019] The above-mentioned relative refers to the correspondence in spatial position.

[0020] In a feasible implementation, the axes of the rotation shafts of the two backward wind wheels (12) are parallel to the air duct side plates (63) and perpendicular to the air duct upper shell (62) and the air duct lower shell (61).

[0021] In a feasible embodiment, the air sucked in by the backward wind wheel (12) flows into the air duct through the air duct upper shell (62) and the filter screen (5) in sequence, and flows out from the air duct side plate (63) after being guided by the volute tongue (2).

[0022] From the perspective of technical effects, compared to the air duct structure with side air intake and top air outlet in a rear-facing wind wheel purifier, the present application designs the air duct structure and adopts an air duct structure with rear air intake and air outlet on both sides. Users can directly feel the air outlet of the purifier, which has a heat-reducing effect. Moreover, due to the air outlet on both sides, the air outlet area is large and the wind speed is low, so users will not feel uncomfortable due to excessive wind speed while feeling the air outlet. Compared to an air purifier with two forward wind wheels, the air duct structure of the present application reduces the inlet on one side and replaces it with a closed shell design, which has a simple structure and is easier to clean.

[0023] In a feasible implementation, the axes on which the rotation shafts of the two backward wind wheels (12) are located are parallel to the vertical direction or the horizontal direction.

[0024] In a feasible implementation manner, two volute tongues (2) are provided at the air outlet (633) of each air duct, and the two volute tongues (2) are symmetrical based on the axis of the motor (1).

[0025] In a feasible embodiment, the relative symmetry based on the axis of the motor (1) means that the two volute tongues (2) are axially symmetrical with the motor axis as the axis of symmetry, or the two volute tongues (2) are centrally symmetrical with the motor axis.

[0026] From the technical effect point of view, symmetrical arrangement of the two volute tongues in the same air duct, especially central symmetry, can make the airflow out of both sides of the purifier more uniform, effectively reduce the noise of the machine while avoiding the mixing of air inside the air duct, so that there is no interference between the dual air ducts.

[0027] In a feasible embodiment, the protruding portion (21) of the volute tongue (2) includes a first position point (22), and the junction between the volute tongue (2) and the first air duct side plate includes a second position point (23); wherein the protruding portion (21) is the farthest end of the volute tongue (2) extending along the air flow direction of its inner surface, and the first air duct side plate is also connected to another side plate at the junction, and the airflow in the air duct flows out through the volute tongue (2) and the first air duct side plate in sequence; the projection of a straight line passing through the first position point (22) and the second position point (23) on a reference plane intersects with the projection of a rearward wind wheel (12) corresponding to the volute tongue (2) on the reference plane, and the reference plane is parallel to the air duct lower shell (61) or the air duct upper shell (62).

[0028] The first air duct side panel refers to the air duct side panel through which the air flowing out through the volute tongue flows when it subsequently flows out.

[0029] Among them, the backward wind wheel corresponding to the volute tongue refers to the backward wind wheel located in the same air duct as the volute tongue.

[0030] From the technical effect point of view, the projection of the above-mentioned connection line on the reference plane overlaps with the projection of the corresponding rear wind wheel on the reference plane, which means that the extension distance of the snail tongue is shorter, and the air outlet of the side panel of the air duct is less blocked, so that the air outlet area of ​​the air duct is larger. Compared with the longer snail tongue in the air duct of the forward wind wheel, under the same power, the snail tongue structure in the present application can make the air flow rate flowing out through the side panel of the air duct lower, and the user experience is better.

[0031] In a feasible embodiment, the dual air duct includes a first air duct and a second air duct, the first air duct is provided with a first volute tongue and a second volute tongue at the air outlet, and the second air duct is provided with a third volute tongue and a fourth volute tongue at the air outlet; the flow direction of the air flowing out through the first volute tongue is opposite to the flow direction of the air flowing out through the second volute tongue, and the flow direction of the air flowing out through the third volute tongue is opposite to the flow direction of the air flowing out through the fourth volute tongue.

[0032] In a feasible embodiment, the second volute tongue and the third volute tongue are arranged between the two backward wind wheels (12), and the flow direction of the air flowing out through the second volute tongue is opposite to the flow direction of the air flowing out through the third volute tongue.

[0033] That is, among the above four volute tongues, the first volute tongue and the third volute tongue are located on the same side, and the second volute tongue and the fourth volute tongue are located on the other side.

[0034] From the perspective of technical effects, the third and fourth volute tongues in the present application can be obtained by translating the first and second volute tongues as a whole. This volute tongue setting method can make the distance between the two air outlets on the air duct side panel on one side basically the same as the distance between the two air outlets on the air duct side panel on the other side, thereby making the air flowing out into the room more uniform and providing a better user experience.

[0035] In a feasible embodiment, a power adapter (64) is provided on the inner wall of the air duct side plate (63), the output end of the power adapter (64) is connected to a pin of a micro switch (65), and the other pin of the micro switch (65) is connected to the power access end of the air purifier PCB board (66).

[0036] In a feasible embodiment, a slot is provided at the connection position between the inner side of the air duct side plate (63) and the air duct lower shell (61), and the micro switch (65) is turned on by pressing the micro switch touch panel through the slot.

[0037] In a feasible implementation, a UVC sterilization device (3), a positive and negative ion sterilization device (4) and an air detection sensor are arranged in the air duct.

[0038] The beneficial effects of the utility model include:

[0039] (1) High purification efficiency, low power consumption and small size;

[0040] (2) Simple structure and low production cost;

[0041] (3) Has good wind pressure and low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of an explosion structure of an air purifier with a dual air duct structure according to a preferred embodiment of the utility model is shown;

[0043] Figure 2 A schematic diagram of the volute tongue structure of an air purifier with a double air duct structure according to a preferred embodiment of the utility model is shown;

[0044] Figure 3 A schematic diagram of the circuit connection structure of an air purifier with a dual air duct structure according to a preferred embodiment of the utility model is shown.

[0045] Description of Figure Numbers:

[0046] 1- Motor;

[0047] 2-Cochlear tongue;

[0048] 3-UVC sterilization device;

[0049] 4- Positive and negative ion sterilization device;

[0050] 5-Filter;

[0051] 12-rearward wind wheel;

[0052] 21- protrusion;

[0053] 22- first position point;

[0054] 23-second position point;

[0055] 61- air duct lower shell;

[0056] 62- air duct upper shell;

[0057] 63- air duct side panel;

[0058] 64-power adapter;

[0059] 65-micro switch;

[0060] 66-PCB board;

[0061] 631-Formaldehyde sensor;

[0062] 632-dust sensor;

[0063] 633-Air outlet. DETAILED DESCRIPTION

[0064] The present invention is further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more specific.

[0065] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0066] Technical terminology:

[0067] Forward wind wheel: The angle between the extension line of the outer side of the blade (the side close to the circumference of the wind wheel) and the tangent line of the blade at that point (the point where the blade and the circumference of the wind wheel meet) is an obtuse angle, which is a forward wind wheel. For air purifiers using forward wind wheels, with the wind wheel as a reference, the wind duct structure is usually adopted with air intake from the front and back sides and air outlet from the top.

[0068] Backward wind wheel: The angle between the extension line of the outer side of the blade (close to the side of the wind wheel circle) and the opposite direction of the tangent line of the blade's rotation direction at that point is an acute angle, which is a backward wind wheel. For air purifiers using backward wind wheels, the wind wheel is usually set horizontally (that is, the wind wheel's rotation axis is in the vertical direction). Taking the wind wheel as a reference, the wind duct structure is usually adopted with air intake at the lower side of the wind wheel and air outlet at the upper side.

[0069] According to the utility model, a double air duct structure air purifier is provided. Figure 1-3 As shown, two motors 1 are arranged side by side inside, and a backward wind wheel 12 is arranged on each of the two motors 1 to form a double air duct;

[0070] A snail tongue 2 is provided at the air outlet of the air duct;

[0071] like Figure 1 As shown, the volute tongue 2 is formed on the side plate on which the backward wind wheel is loaded (such as Figure 3As shown in the figure, the air sucked by the backward wind wheel 12 flows into the wind duct through the wind duct upper shell 62 and the filter screen 5 in sequence, and flows out from the wind duct side plate 63 after being guided by the volute tongue 2. The wind duct upper shell 62 and the wind duct lower shell 61 are arranged opposite to each other, and the filter screen 5 is arranged between the wind duct upper shell 62 and the two backward wind wheels 12. The wind duct side plate 63 is arranged on the side of the wind duct, and the wind duct side plate 63, the wind duct upper shell 62, and the wind duct lower shell 61 are surrounded to form the wind duct. That is, the air purifier in this application adopts a wind duct structure with air intake from the back and air outlet from both sides.

[0072] Among them, Figure 1 As shown, the grille structure on the side panels of the air duct on both sides is the air outlet 633.

[0073] like Figure 1 As shown, the air inlet surfaces of the two backward wind wheels 12 are opposite to the filter screen 5 , and part of the circumferential side surface of each backward wind wheel is opposite to the air duct side plate 63 .

[0074] The above-mentioned relative refers to corresponding in spatial position.

[0075] Among them, in the direction parallel to the air duct upper shell 62 or the air duct lower shell 61, the distance from any point on the circumferential side surface of the backward wind wheel to the rotation axis of the backward wind wheel is equal to the radius of the backward wind wheel.

[0076] Among them, Figure 1 As shown, the axes of the rotation shafts of the two backward wind wheels 12 are parallel to the air duct side plates 63 and perpendicular to the air duct upper shell 62 and the air duct lower shell 61.

[0077] Among them, Figure 1 As shown, the lower shell 61 of the air duct is configured to be compatible with the volute tongue 2 so as to be engaged with the side plate on which the backward wind wheel is loaded.

[0078] A UVC sterilization device 3 and a positive and negative ion sterilization device 4 are arranged in the air duct, and a filter screen 5 is arranged in the air duct.

[0079] According to the utility model, the double air duct arrangement is used to increase the air volume, thereby avoiding high-frequency vibration caused by a high-speed motor and a large wind wheel.

[0080] Optionally, the axes on which the rotation shafts of the two backward wind wheels 12 are located are parallel to the vertical direction or the horizontal direction.

[0081] Furthermore, by using a backward wind wheel, the wind pressure is increased, thereby reducing the performance degradation of the air purifier by the filter.

[0082] Two volute tongues 2 are arranged at the air outlet of each air duct, and the two volute tongues 2 are symmetrical based on the axis of the motor 1.

[0083] In a preferred embodiment, two volute tongues 2 are provided at the air outlet of each air duct, and the two volute tongues 2 are symmetrical with the motor axis as the symmetry axis. Figure 2 As shown, two volute tongues 2 are arranged at the air outlet of each air duct, and the two volute tongues 2 are centrally symmetrical about the motor axis. That is, after one volute tongue in the air duct is rotated 180 degrees around the motor axis, it overlaps with the other volute tongue in the air duct.

[0084] The volute tongue is a tongue-like structure formed by the shell wall at the connection between the air duct shell and the air outlet, and is often set in a centrifuge. In the utility model, by setting two axially symmetrical volute tongues 2 at the air outlet position, the machine noise is effectively reduced while avoiding the mixing of air inside the air duct, so that there is no interference between the two air ducts. Or, as Figure 2 As shown, by setting two centrally symmetrical volute tongues 2 at the air outlet position, the airflow outflowing from both sides of the purifier can be made more uniform, effectively reducing the machine noise while avoiding the mixing of air inside the air duct, thereby eliminating interference between the dual air ducts.

[0085] In a preferred embodiment, Figure 2 As shown, the protruding portion 21 of the volute tongue 2 includes a first position point 22, and the junction between the volute tongue 2 and the first air duct side plate includes a second position point 23; wherein the protruding portion 21 is the farthest end of the volute tongue 2 extending along the air flow direction of its inner surface, and the first air duct side plate is also connected to the other side plate at the junction, and the airflow in the air duct flows out through the volute tongue 2 and the first air duct side plate in sequence; the projection of the straight line passing through the first position point 22 and the second position point 23 on the reference plane intersects with the projection of the rear wind wheel 12 corresponding to the volute tongue 2 on the reference plane, and the reference plane is parallel to the lower shell 61 of the air duct or the upper shell 62 of the air duct.

[0086] The protrusion 21 of the volute tongue 2 refers to the farthest end of the volute tongue 2 extending along the air flow direction of its inner surface. The first position point 22 can be any point on the protrusion 21. There can be multiple air duct side panels 63, and the first air duct side panel is one of them, and the first air duct side panel is the air duct side panel through which the air flows after flowing out of the volute tongue 2.

[0087] Among them, the two backward wind wheels 12 are regarded as a whole. When the volute tongue 2 is located on both sides of this whole part, the above-mentioned other side plate is a duct side plate 63; when the volute tongue 2 is located in the middle of the two backward wind wheels 12, the above-mentioned other side plate is a partition between the two wind wheels 12.

[0088] Optionally, the first air duct side panel and the other side panel may be integral or detachable, which is not limited in the present application.

[0089] Optionally, two end points of the straight line passing through the first position point 22 and the second position point 23 are two intersection points with the purifier housing after the straight line is extended.

[0090] The connecting line between the first position point and the second position point may be a connecting line formed with any one of the four volute tongues in the air duct as the object, that is, any one of the volute tongues meets the above requirements.

[0091] Among them, the above-mentioned dual air duct includes a first air duct and a second air duct, a first volute tongue and a second volute tongue are provided at the air outlet of the first air duct, and a third volute tongue and a fourth volute tongue are provided at the air outlet of the second air duct; the direction of air flowing out through the first volute tongue is opposite to the direction of air flowing out through the second volute tongue, and the direction of air flowing out through the third volute tongue is opposite to the direction of air flowing out through the fourth volute tongue.

[0092] Optionally, the second volute tongue and the third volute tongue are arranged between two backward wind wheels (12), and the flow direction of the air flowing out through the second volute tongue is opposite to the flow direction of the air flowing out through the third volute tongue.

[0093] That is, among the above four volute tongues, the first volute tongue and the third volute tongue are located on the same side, and the second volute tongue and the fourth volute tongue are located on the other side.

[0094] Specifically, the same side means that the first air duct side panels corresponding to the first volute tongue and the third volute tongue are the same, and similarly, the first air duct side panels corresponding to the second volute tongue and the fourth volute tongue are the same.

[0095] Optionally, the first volute tongue corresponds to the first air outlet, the second volute tongue corresponds to the second air outlet, the third volute tongue corresponds to the third air outlet, the fourth volute tongue corresponds to the fourth air outlet, and the distance between the center of the first air outlet and the center of the third air outlet is equal to the distance between the center of the second air outlet and the center of the fourth air outlet.

[0096] The air outlet corresponding to the above-mentioned volute tongue refers to the air outlet 633 through which the air flowing out of the volute tongue subsequently flows.

[0097] The center of the air outlet may refer to the centroid or other geometric center of the air outlet area.

[0098] In the present invention, there is no limitation on the specific models of the UVC sterilization device and the positive and negative ion sterilization device, and those skilled in the art may adopt any known model.

[0099] In a preferred embodiment, a duct lower shell 61 is provided at the duct inlet end, a duct upper shell 62 is provided at the duct outlet end, a duct side plate 63 is provided on the duct side, and an air detection sensor is provided on the duct side plate 63.

[0100] Furthermore, the air detection sensor includes a formaldehyde sensor 631 and a dust sensor 632, which are used to detect indoor air quality.

[0101] In a preferred embodiment, the two motors 1 are fixed on the air duct side plate 63 via a bracket, the air duct lower shell 61 is a flat plate, and the air duct lower shell 61 and the air duct side plate 63 are connected via screws.

[0102] According to the utility model, there can be multiple air duct side panels 63, and multiple air duct side panels 63 form a closed air duct.

[0103] The overall strength of the duct side plate 63 is enhanced by the duct lower shell 61, so that the brackets of the two motors can be directly fixed to the duct side plate. The brackets of the motors can be made of plastic materials instead of metal plates, thereby saving production costs.

[0104] In a preferred embodiment, a power adapter 64 is provided on the inner wall of the air duct side plate 63. The power adapter 64 has a sealed housing and is used to convert AC power into 24V DC power.

[0105] The output end of the power adapter 64 is connected to one pin of the micro switch 65, and the other pin of the micro switch 65 is connected to the power access end of the air purifier PCB board 66, so that when the micro switch 65 is turned on, the output end of the power adapter 64 is electrically connected to the power access end of the air purifier PCB board 66; when the micro switch 65 is turned off, the output end of the power adapter 64 is disconnected from the power access end of the air purifier PCB board 66;

[0106] The air purification device with a built-in power adapter provided by the utility model adopts a power adapter with a sealed shell to replace the step-down circuit of a traditional PCB board, and separates the power adapter from the PCB board through a micro switch, thereby achieving physical separation of strong electricity and weak electricity and improving safety.

[0107] In a preferred embodiment, a card slot is provided at the connection position between the inner side of the air duct side plate 63 and the air duct lower shell 61, and the micro switch touch panel is pressed by the card slot. When the air duct side plate 63 is detached from the air duct lower shell 61, the micro switch 65 is detached from the card slot, thereby closing the micro switch, so that after the shell is disassembled, the power supply of the PCB board is automatically disconnected, thereby protecting the device and the user.

[0108] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", etc. indicate positions or positional relationships based on the working state of the present invention, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0109] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0110] The present invention has been described above in conjunction with preferred embodiments, but these embodiments are only exemplary and serve only as an illustration. On this basis, the present invention may be subjected to a variety of substitutions and improvements, all of which fall within the scope of protection of the present invention.

Claims

1. A dual-duct structure air purifier, characterized in that: Two motors (1) are arranged side by side inside, and a backward wind wheel (12) is arranged on each of the two motors (1) to form a double air duct, and a volute tongue (2) is arranged at the air outlet (633) of the air duct; An upper air duct shell (62) and a lower air duct shell (61) are arranged opposite to each other, a filter screen (5) is arranged between the upper air duct shell (62) and the two backward wind wheels (12), and an air duct side plate (63) is arranged on the side of the air duct, and the air duct side plate (63) and the upper air duct shell (62) and the lower air duct shell (61) are arranged to form the air duct.

2. The double-duct structure air purifier according to claim 1, characterized in that: The air inlet surfaces of the two backward wind wheels (12) are opposite to the filter screen (5), and part of the peripheral side surface of each backward wind wheel is opposite to the air duct side plate (63).

3. The double-duct structure air purifier according to claim 2, characterized in that: The air sucked in by the backward wind wheel (12) flows into the air duct through the air duct upper shell (62) and the filter screen (5) in sequence, and flows out from the air duct side plate (63) after being guided by the volute tongue (2).

4. The double-duct structure air purifier according to claim 3, characterized in that: The axes of the rotating shafts of the two backward wind wheels (12) are parallel to the air duct side plates (63) and perpendicular to the air duct upper shell (62) and the air duct lower shell (61).

5. The double-duct structure air purifier according to claim 4, characterized in that: The axes on which the rotation shafts of the two backward wind wheels (12) are located are parallel to the vertical direction or the horizontal direction.

6. The double-duct structure air purifier according to any one of claims 1 to 5, characterized in that: Two volute tongues (2) are arranged at the air outlet (633) of each air duct, and the two volute tongues (2) are symmetrical based on the axis of the motor (1).

7. The double-duct structure air purifier according to claim 6, characterized in that: The relative symmetry based on the axis of the motor (1) means that the two volute tongues (2) are axially symmetrical with the motor axis as the axis of symmetry, or the two volute tongues (2) are centrally symmetrical with the motor axis.

8. The double-duct structure air purifier according to claim 7, characterized in that: The protruding portion (21) of the volute tongue (2) includes a first position point (22), and the junction between the volute tongue (2) and the first air duct side plate includes a second position point (23); wherein the protruding portion (21) is the farthest end of the volute tongue (2) extending along the air flow direction of its inner surface, and the first air duct side plate is also connected to another side plate at the junction, and the airflow in the air duct flows out through the volute tongue (2) and the first air duct side plate in sequence; The projection of a straight line passing through the first position point (22) and the second position point (23) on a reference plane intersects with the projection of a backward wind wheel (12) corresponding to the volute tongue (2) on the reference plane, and the reference plane is parallel to the lower shell (61) of the air duct or the upper shell (62) of the air duct.

9. The double-duct structure air purifier according to claim 7 or 8, characterized in that: The double air duct comprises a first air duct and a second air duct, the first air duct is provided with a first volute tongue and a second volute tongue at the air outlet, and the second air duct is provided with a third volute tongue and a fourth volute tongue at the air outlet; The flow direction of the air flowing out through the first volute tongue is opposite to the flow direction of the air flowing out through the second volute tongue, and the flow direction of the air flowing out through the third volute tongue is opposite to the flow direction of the air flowing out through the fourth volute tongue.

10. The double-duct structure air purifier according to claim 9, characterized in that: The second volute tongue and the third volute tongue are arranged between the two backward wind wheels (12), and the flow direction of the air flowing out through the second volute tongue is opposite to the flow direction of the air flowing out through the third volute tongue.

11. The air purifier with a dual air duct structure according to any one of claims 1-5, 7-8, and 10, characterized in that: A power adapter (64) is provided on the inner wall of the air duct side plate (63); an output end of the power adapter (64) is connected to a pin of a micro switch (65); and another pin of the micro switch (65) is connected to a power access end of an air purifier PCB board (66).

12. The double-duct structure air purifier according to claim 11, characterized in that: A slot is provided at the connection position between the inner side of the air duct side plate (63) and the air duct lower shell (61), and the micro switch (65) is turned on by pressing the micro switch touch panel through the slot.

13. The air purifier with a dual air duct structure according to any one of claims 1-5, 7-8, 10 and 12, characterized in that: A UVC sterilization device (3), a positive and negative ion sterilization device (4) and an air detection sensor are arranged in the air duct.

Images