Air purifier

Abstract

This invention provides an air purifier, comprising: a cylindrical outer shell with an internal space serving as a flow channel; and a purification component disposed within the flow channel, including a rotating shaft arranged along the direction of the flow channel at its center and a filter unit disposed on the rotating shaft. The filter unit includes at least one first filter screen, which extends from the rotating shaft to a point near the inner wall of the outer shell. The plane containing the first filter screen is parallel to the airflow direction in the flow channel; or the plane containing the first filter screen intersects but is not perpendicular to the airflow direction in the flow channel, and the projected area of ​​the first filter screen on the airflow cross-section at its location is smaller than the area of ​​the airflow cross-section. Based on the technical solution of this invention, a structural design is adopted in which the filter screen does not completely cover the airflow cross-section. This firstly reduces wind resistance; combined with the active rotation of the filter screen, it can dynamically and completely cover the airflow cross-section, thereby ensuring and improving particle capture efficiency. The particle capture efficiency can also be actively controlled by the rotation speed.

Description

Technical Field

[0001] This invention relates to the field of air purification equipment technology, and particularly to an air purifier. Background Technology

[0002] With economic development and improved living standards, the proliferation of chemical plants, construction sites, and automobiles generates large amounts of dust and pollutants. These particulate pollutants can enter indoor spaces through windows and other building envelopes, posing a serious threat to people's health. Advances in technology and increased health awareness have led to a growing trend of using air purifiers to eliminate indoor pollutants.

[0003] Currently, various types of air purifiers are available on the market. General filter-type air purifiers can effectively filter some larger particles. For some tiny particles, additional high-efficiency filters are needed. However, high-efficiency filters face the problem of balancing filtration efficiency and air resistance. That is, while an overly dense filter improves filtration efficiency, it also creates significant air resistance, resulting in a very noticeable pressure drop and greatly reducing the air purification flow rate per unit time.

[0004] The root cause of these problems is that current air purifiers are all passive purification devices, relying on airflow carrying particles that collide with the filter. Therefore, the filter must obstruct the airflow. To improve filtration efficiency, even more stringent high-efficiency filters with finer mesh must be used, which inevitably increases air resistance significantly. Therefore, it is necessary to design a new type of air purifier that uses active filtration to improve air purification efficiency while minimizing pressure drop. Summary of the Invention

[0005] To address the problem that existing passive air purifiers, while improving filtration efficiency, can lead to excessively high air resistance, this invention proposes an air purifier that employs an active filtration structure to solve the balance between filtration efficiency and air resistance.

[0006] The present invention proposes an air purifier, characterized in that it comprises:

[0007] The outer casing is a cylindrical structure with an internal space serving as a flow channel. The two ends of the outer casing are respectively the air inlet and air outlet of the flow channel; and

[0008] A purification assembly is disposed within the flow channel, comprising a rotating shaft arranged along the direction of the flow channel at the center of the flow channel and a filter unit disposed on the rotating shaft. The filter unit comprises at least one first filter screen disposed circumferentially on the rotating shaft, the first filter screen extending from the rotating shaft to the inner wall near the outer casing.

[0009] The plane on which the first filter is located is parallel to the airflow direction in the flow channel; or the plane on which the first filter is located intersects with but is not perpendicular to the airflow direction in the flow channel, and the projected area of ​​the first filter on the cross-section of the flow channel at its location is smaller than the area of ​​the cross-section.

[0010] In one embodiment, the target plane where the first filter is located is obliquely intersecting the rotating shaft. When the first filter is rotated by the rotating shaft, the side of the filter facing away from the air inlet is the windward side.

[0011] In one embodiment, the filtering unit further includes a second filter screen located downstream of the location of the first filter screen in the flow channel direction, the rotating shaft passing through the center of the second filter screen, and the shape and size of the second filter screen matching the shape and size of the cross-section of the flow channel at its location.

[0012] In one embodiment, the purification assembly further includes an electro-purification unit located downstream of the filter unit in the flow channel direction. The electro-purification unit includes at least one set of electrodes arranged circumferentially on the rotating shaft. The electrode set includes discharge electrodes and dust collection grounding plates distributed circumferentially along the rotating shaft.

[0013] In one embodiment, multiple discharge electrodes and multiple dust collection grounding plates in multiple sets of electrode groups are distributed circumferentially along the rotating shaft, and the discharge electrodes and the dust collection grounding plates are alternately arranged.

[0014] In one embodiment, the outer casing is a conical cylindrical structure, and the air inlet is located at the large-diameter end of the conical cylindrical structure, while the air outlet is located at the small-diameter end of the conical cylindrical structure.

[0015] In one embodiment, the rotating shaft is further provided with an exhaust fan, which is located at the end of the rotating shaft close to the air outlet.

[0016] In one implementation, it further includes:

[0017] The base includes a bottom plate and a top plate. The bottom plate is connected to the end of the rotating shaft that extends out of the air inlet, and the top plate is connected to the end of the rotating shaft that extends out of the air outlet.

[0018] There is an air inlet gap between the base plate and the air inlet, and an air outlet gap between the top plate and the air outlet, and the projection of the top plate on the plane where the air outlet is located completely covers the air outlet.

[0019] In one embodiment, the housing is connected to the base and remains relatively fixed, or the housing is connected to the rotating shaft via the purification assembly and remains mutually fixed with the rotating shaft.

[0020] In one embodiment, a carrier plate is fixed to the end of the rotating shaft that is close to the air inlet. The rotating shaft passes through the center of the carrier plate, and the edge of the carrier plate is close to the edge of the air inlet. The carrier plate is a flat plate structure or a conical structure that protrudes outward from the center of the air inlet.

[0021] The above-mentioned technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0022] The air purifier provided by this invention has at least the following beneficial effects compared with the prior art:

[0023] An air purifier of the present invention adopts a structural design in which the filter does not completely cover the airflow section, which can reduce wind resistance. Combined with the design of the filter being able to rotate actively, the filter can dynamically and completely cover the airflow section, thereby ensuring the particle capture efficiency. The particle capture efficiency can also be actively controlled by controlling the rotation speed. Furthermore, the rotation allows the filter to actively collide with the airflow, which can also improve the particle capture efficiency to a certain extent. Attached Figure Description

[0024] The invention will now be described in more detail with reference to embodiments and the accompanying drawings.

[0025] Figure 1 A schematic diagram of the internal structure of the air purifier of the present invention is shown;

[0026] Figure 2 A schematic diagram of the external structure of the air purifier of the present invention is shown.

[0027] In the accompanying drawings, the same parts use the same reference numerals. The drawings are not to scale.

[0028] Figure label:

[0029] 1-Outer shell, 11-Air inlet, 111-Air inlet gap, 12-Air outlet, 121-Air outlet gap, 2-Purification component, 21-Rotating shaft, 22-Filter unit, 221-First filter, 222-Second filter, 23-Electrical purification unit, 231-Discharge electrode, 232-Dust collection grounding plate, 3-Exhaust fan, 4-Base, 41-Bottom plate, 42-Top plate, 5-Carrier tray. Detailed Implementation

[0030] The invention will now be further described with reference to the accompanying drawings.

[0031] An embodiment of the present invention provides an air purifier, comprising:

[0032] The outer casing 1 is a cylindrical structure with an internal space that serves as a flow channel. The two ends of the outer casing 1 are respectively the air inlet 11 and the air outlet 12 of the flow channel; and

[0033] Purification component 2 is disposed in the flow channel and includes a rotating shaft 21 arranged in the center of the flow channel along the direction of the flow channel and a filter unit 22 disposed on the rotating shaft 21. The filter unit 22 includes at least one first filter screen 221 disposed in the circumferential direction of the rotating shaft 21. The first filter screen 221 extends from the rotating shaft 21 to the inner wall near the outer casing 1.

[0034] The plane where the first filter 221 is located is parallel to the airflow direction in the flow channel; or the plane where the first filter 221 is located intersects with but is not perpendicular to the airflow direction in the flow channel, and the projected area of ​​the first filter 221 on the cross-section of the flow channel at its location is smaller than the area of ​​the cross-section.

[0035] Specifically, as shown in the attached diagram. Figure 2 As shown in the attached figure, the technical solution of this application first utilizes the outer casing 1 to form an air filtration channel, and then sets the purification component 2 in the channel to achieve filtration. Figure 1 As shown, the core inventive point of this application lies in the design of the filter structure of the purification component 2, so as to reduce the wind resistance as much as possible while ensuring the filtration effect and filtration efficiency.

[0036] The technical solution adopted in this application is as follows: First, a rotating shaft 21 that can be actively rotated is set in the flow channel to drive the filter unit 22 to rotate, thus fundamentally realizing active filtration, that is, driving the filter to actively collide with the airflow. Furthermore, the structure of the first filter 221 of the filter unit 22 is designed such that the plane of the first filter 221 is parallel to the airflow direction in the flow channel, or the plane of the first filter 221 intersects but is not perpendicular to the airflow direction in the flow channel, and the projected area of ​​the first filter 221 on the airflow cross-section of the flow channel at its location is smaller than the area of ​​the airflow cross-section. The purpose of this design is to ensure that, structurally, the first filter 221 does not completely cover the airflow cross-section of the flow channel (i.e., the cross-section of the flow channel perpendicular to the airflow direction), as shown in the attached figure. Figure 2 As shown, there are other flow paths in the flow channel outside the first filter 221. This means that the structure of the first filter 221 itself will not completely block the airflow in the flow channel, fundamentally reducing the wind resistance of the filter to the airflow. When the filter rotates under the drive of the rotating shaft 21, the area it rotates through can completely cover the cross-section of the flow channel from a dynamic perspective, thus ensuring the filtration effect. Moreover, this filtration effect can be controlled in real time by adjusting the rotation speed of the rotating shaft 21.

[0037] Therefore, the filter unit 22 of the present invention can reduce wind resistance in its basic structural design, while the active filtration method achieved by rotation ensures filtration effect and efficiency. Furthermore, based on the rotating filter structure of this application, it achieves unexpected technical effects: the structure of the rotating shaft 21 combined with the first filter screen 221 also functions as a fan blade, actively guiding the airflow, imparting kinetic energy to the airflow, improving the airflow's fluidity and instantaneous flow rate, and further reducing the impact of wind resistance on airflow.

[0038] Furthermore, the first filter 221 can adopt a double-layer filter structure, with activated carbon filled between the two layers, to address needs such as odor removal.

[0039] Preferably, the target plane where the first filter 221 is located is obliquely intersecting the rotating shaft 21. When the first filter 221 is rotated by the rotating shaft 21, the surface of the first filter 221 facing away from the air inlet 11 is the windward side.

[0040] Specifically, based on the airflow guiding effect of the first filter 221 when rotating, the rotation direction of the rotating shaft 21 and the tilt direction relative to the first filter 221 are further controlled so that when the first filter 221 is rotated by the rotating shaft 21, the side of its surface away from the air inlet 11 is the windward side, which can guide the airflow in the flow channel to the air outlet 12 end and increase the airflow flow.

[0041] In one embodiment, the filter unit 22 further includes a second filter 222, which is located downstream of the location of the first filter 221 in the flow channel direction. The rotating shaft 21 passes through the center of the second filter 222, and the shape and size of the second filter 222 match the shape and size of the air passage cross section at its location.

[0042] Specifically, the attached diagram Figure 1 As shown, the second filter 222 serves as an auxiliary filtration structure for the filtration unit 22, primarily to filter particles escaping from the first filter 221 and enhance the filtration effect. Since the first filter 221 is not a structure that completely blocks the airflow path, some particles inevitably remain unfiltered. The second filter 222 is structurally designed to completely cover the airflow cross-section of the flow channel. Its edges can be in sealed contact with the inner wall of the outer casing 1 (the outer casing 1 does not rotate with the shaft 21), or directly connected to the inner wall of the outer casing 1 (the outer casing 1 rotates with the shaft 21). Preferably, the edges of the second filter 222 are in sealed contact with the inner wall of the outer casing 1. The second filter 222 merely serves as a reinforcing structure for filtration; since most particles have already been captured by the first filter 221, only a general filter is needed, resulting in low wind resistance and minimal impact on airflow.

[0043] Furthermore, the rotation of the second filter screen 222 with the rotating shaft 21 can make the particles more evenly distributed on the filter screen, avoiding the local accumulation of particles on the filter screen due to the fixed installation position of the traditional filter screen, thereby avoiding the generation of excessive local wind resistance.

[0044] In one embodiment, the purification assembly 2 further includes an electro-purification unit 23 located downstream of the filter unit 22 in the flow channel direction. The electro-purification unit 23 includes at least one set of electrodes arranged circumferentially on the rotating shaft 21. The electrode set includes a discharge electrode 231 and a dust collection grounding plate 232 distributed circumferentially along the rotating shaft 21.

[0045] Specifically, as shown in the attached diagram. Figure 1 As shown, air passing through filter unit 22 (primarily filtering coarse particles) enters electro-purification unit 23 (primarily filtering fine particles), which consists of discharge electrode 231 and dust collection grounding plate 232. After particles enter the area of ​​electro-purification unit 23, they become charged due to corona discharge at discharge electrode 231 and begin to move towards dust collection grounding plate 232 and be captured. At the same time, as electro-purification unit 23 rotates with shaft 21, it indirectly shortens the path length of particles charged at discharge electrode 231 to dust collection grounding plate 232, increasing the chance of particles attaching to dust collection grounding plate 232 and improving the purification efficiency of air purifier.

[0046] In one embodiment, multiple discharge electrodes 231 and multiple dust collection and grounding plates 232 in multiple electrode groups are distributed circumferentially along the rotating shaft 21, and the discharge electrodes 231 and the dust collection and grounding plates 232 are alternately arranged.

[0047] Specifically, as shown in the attached diagram. Figure 1 As shown, in the alternating distribution structure, each of the front and back sides of the dust collection grounding plate 232 corresponds to a discharge electrode 231. In principle, both sides of the dust collection grounding plate 232 can be used as dust collection surfaces, thereby increasing the chance of particle capture and extending the one-time use time of the dust collection grounding plate 232.

[0048] In one embodiment, the outer casing 1 is a conical cylindrical structure, with the air inlet 11 located at the large-diameter end of the conical cylindrical structure and the air outlet 12 located at the small-diameter end of the conical cylindrical structure.

[0049] Specifically, as shown in the attached diagram. Figure 2 As shown, the outer shell 1 is a conical cylindrical structure with an inner diameter that gradually decreases along the airflow direction. Its purpose is to make the particles gradually gather towards the center of the flow channel, increase the chance of particle collision and aggregation, and facilitate particle collection.

[0050] In one embodiment, an exhaust fan 3 is also provided on the rotating shaft 21, located at the end of the rotating shaft 21 near the air outlet 12. The exhaust fan 3 is used to improve the airflow at the air outlet 12, because the airflow may be reduced to some extent due to filtration downstream of the filter unit 22.

[0051] In one embodiment, it also includes:

[0052] The base 4 includes a bottom plate 41 and a top plate 42. The bottom plate 41 is connected to the end of the rotating shaft 21 that extends out of the air inlet 11, and the top plate 42 is connected to the end of the rotating shaft 21 that extends out of the air outlet 12. There is an air inlet gap 111 between the bottom plate 41 and the air inlet 11, and an air outlet gap 121 between the top plate 42 and the air outlet 12. The projection of the top plate 42 on the plane where the air outlet 12 is located completely covers the air outlet 12.

[0053] Specifically, as shown in the attached diagram. Figure 1 and Figure 2 As shown, the base plate 41 in the base 4 mainly serves as the foundation of the entire air purifier and is a fixed structure. The bottom of the rotating shaft 21 is fixed to the base plate 41. The motor driving the rotating shaft 21 and various transmission components can also be installed inside the base plate 41 (increasing the size of the base plate 41). The base plate 41 also serves as the flow control for the air inlet 11, so that the air inlet 11 actually receives air through a reduced air inlet gap 111, avoiding excessive airflow that could affect the filtration effect. The top plate 42 is mainly used to shield the air outlet 12 from the front, preventing foreign objects from falling into the air inlet 11, especially in air purifiers as shown in the attached diagram. Figure 2 The vertical placement shown also prevents personnel from accidentally touching internal structures such as the rotating shaft 21 through the air inlet 11, which could cause injury.

[0054] In one embodiment, the housing 1 is connected to the base 4 and remains relatively fixed, or the housing 1 is connected to the rotating shaft 21 via the purification assembly 2 and remains mutually fixed with the rotating shaft 21.

[0055] Specifically, the outer casing 1 can rotate with the rotating shaft 21 or not rotate. When the outer casing 1 rotates with the rotating shaft 21, it can be directly connected to the purification component 2 to keep it relatively fixed with the rotating shaft 21, or it can be connected to the top plate 42 so that the top plate 42 and the outer casing 1 rotate together with the rotating shaft 21. When the outer casing 1 does not rotate with the rotating shaft 21, the outer casing 1 can be connected to the base of the base 4 with a connector at the bottom to keep it relatively fixed with the base.

[0056] In one embodiment, a carrier plate 5 is fixed to the end of the rotating shaft 21 that is close to the air inlet 11. The rotating shaft 21 passes through the center of the carrier plate 5, and the edge of the carrier plate 5 is close to the edge of the air inlet 11. The carrier plate 5 is a flat plate structure or a conical structure that protrudes outward from the center of the air inlet 11.

[0057] Specifically, as shown in the attached diagram. Figure 1 and Figure 2 As shown, the carrier tray 5 is located below the filter unit 22, and can receive and collect some of the particles falling from the filter unit 22. Furthermore, the carrier tray 5 can be configured as a conical structure with a relatively concave center to improve the stability of particle collection and prevent particles from falling off the carrier tray 5. Based on the configuration of the carrier tray 5, it can replace the base plate 41 to control the flow rate at the air inlet 11. Therefore, the structure of the base plate 41 can be set to any structure without restriction.

[0058] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0059] While the invention has been described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined in ways different from those described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other described embodiments.

Claims

1. An air cleaner characterized by comprising: include: The outer shell is a cylindrical structure with an internal space that is a flow channel. The two ends of the outer shell are the air inlet and the air outlet of the flow channel, respectively. as well as A purification assembly is disposed within the flow channel, comprising a rotating shaft arranged along the direction of the flow channel at the center of the flow channel and a filter unit disposed on the rotating shaft. The filter unit comprises at least one first filter screen disposed circumferentially on the rotating shaft, the first filter screen extending from the rotating shaft to the inner wall near the outer casing. The plane on which the first filter is located is parallel to the airflow direction in the flow channel; or the plane on which the first filter is located intersects with but is not perpendicular to the airflow direction in the flow channel, and the projected area of ​​the first filter on the cross-section of the flow channel at its location is smaller than the area of ​​the cross-section.

2. The air cleaner according to claim 1, wherein The target plane where the first filter is located is obliquely intersecting the rotating shaft. When the first filter is rotated by the rotating shaft, the side of the filter facing away from the air inlet is the windward side.

3. The air cleaner of claim 1, wherein, The filtration unit further includes a second filter screen, which is located downstream of the first filter screen in the flow channel direction. The rotating shaft passes through the center of the second filter screen, and the shape and size of the second filter screen match the shape and size of the air passage cross section at its location.

4. The air cleaner of claim 1, wherein, The purification assembly further includes an electro-purification unit located downstream of the filter unit in the flow channel direction. The electro-purification unit includes at least one set of electrodes arranged circumferentially on the rotating shaft. The electrode set includes discharge electrodes and dust collection grounding plates distributed circumferentially along the rotating shaft.

5. The air purifier according to claim 4, characterized in that, Multiple discharge electrodes and multiple dust collection and grounding plates in the multiple sets of electrode groups are distributed circumferentially along the rotating shaft, and the discharge electrodes and the dust collection and grounding plates are alternately arranged.

6. The air cleaner of claim 1, wherein, The outer shell is a conical cylindrical structure, and the air inlet is located at the large diameter end of the conical cylindrical structure, while the air outlet is located at the small diameter end of the conical cylindrical structure.

7. The air cleaner of claim 1, wherein, An exhaust fan is also provided on the rotating shaft, and the exhaust fan is located at the end of the rotating shaft that is close to the air outlet.

8. The air cleaner of claim 1, wherein, Also includes: The base includes a bottom plate and a top plate. The bottom plate is connected to the end of the rotating shaft that extends out of the air inlet, and the top plate is connected to the end of the rotating shaft that extends out of the air outlet. There is an air inlet gap between the base plate and the air inlet, and an air outlet gap between the top plate and the air outlet, and the projection of the top plate on the plane where the air outlet is located completely covers the air outlet.

9. The air cleaner of claim 8, wherein, The outer casing is connected to the base and remains relatively fixed, or the outer casing is connected to the rotating shaft through the purification component and remains mutually fixed with the rotating shaft.

10. The air cleaner of claim 1, wherein, A carrier plate is fixed to the end of the rotating shaft that is close to the air inlet. The rotating shaft passes through the center of the carrier plate, and the edge of the carrier plate is close to the edge of the air inlet. The carrier plate is a flat plate structure or a conical structure that protrudes outward from the center of the air inlet.

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