A spoke for a gas purification disk, a gas purification disk, and a gas purification device

Abstract

A spoke for a gas purification disk, which is used to be mounted on the hub of the gas purification disk, and the spoke can rotate around the central line of the gas purification disk; the cross-sectional shapes of the spoke along the central line direction are the same, and the spoke is formed with a first surface and a second surface, wherein the intersection line formed by the first surface and the plane perpendicular to the central line of the spoke is the first intersection line, and the first intersection line is in the shape of a function curve; wherein the intersection line formed by the second surface and the plane perpendicular to the central line of the spoke is the second intersection line. When the spoke of the present invention is in use, it has good filtering effect, small wind resistance, small power and low energy consumption.

Description

Technical Field

[0001] The present invention relates to a spoke for a gas purification disc, particularly for a spoke of a purification disc for removing liquid droplets or solid particles in a gas. Technical Background

[0002] With the increasing development of the economy, people's requirements for the air quality of the environment are getting higher and higher. On the one hand, the requirements for the air quality of the living environment have increased, and the kitchen fumes will have a very large impact on the entire family environment; on the other hand, the requirements for the air quality of the natural environment have also increased, and the increase in atmospheric PM2.5 has attracted wide social attention.

[0003] Kitchen fumes, on the one hand, harm the respiratory health of family members, and on the other hand, after being discharged into the atmosphere, they will generate aerosols and increase the PM2.5 index; a large amount of emissions will seriously affect the air quality.

[0004] There are a variety of existing kitchen flue gas treatment devices. For example, traditional ones include electrostatic adsorption devices, but traditional electrostatic adsorption devices have serious defects, with poor effects and low efficiency. There are also some range hoods that directly suck the air in the kitchen through negative pressure and filter the fumes through a filter screen. This method cannot completely remove the fumes.

[0005] In recent years, a mechanical fume removal device has emerged. The mechanical fume removal device is provided with a negative pressure fan at the upper part to extract the flue gas upward, and a gas purification disc is arranged below the negative pressure fan. The gas purification disc is provided with a plurality of spokes. The gas purification disc rotates during purification. When the air with fumes is extracted by the negative pressure of the negative pressure fan, the air with fumes will pass through the gas purification disc; the spokes on the gas purification disc rotate at high speed, collide with the fume droplets or other particles in the air, and the fume droplets or other particles will adhere to the spokes. Under the action of the spokes, the movement direction is changed, and the particles move tangentially along the spokes, and then finally move to the outer periphery of the purification disc and strike on the inner wall of the purifier and finally slide down and are collected.

[0006] There are some problems with the existing mechanical fume removal devices: 1. The spokes are fixed to the gas purification disc by welding, which brings some obvious defects. First, when the spokes are welded to the hub of the gas purification disc, since welding is a connection method that requires heating, after cooling, both the spokes made of metal and the gas purification disc will undergo a certain degree of deformation, thus affecting the shape of the gas purification disc; second, since the hub of the gas purification disc and the spokes are connected by welding, the spokes will undergo a certain degree of deformation. In order to limit the deformation of the gas purification disc caused by this, the gas purification disc needs to have an outer ring to fix the spokes (see Figure 1); Thirdly, since the spokes are welded to the hub, once the solder joints become loose, the spokes may fall off and shoot out at high speed during high-speed rotation, resulting in personal injury. 2. Difficult spoke welding. When the spokes are welded to the wheel spokes, they need to be evenly distributed on the wheel spokes, which requires the design of a separate fixture for clamping the spokes and the hub; in addition, there are many and small solder joints, making welding difficult. 3. The shape of the spokes is single, mainly circular, and some are of other shapes. Circular spokes are easy to install, but the product of the diameter and the number is limited by the diameter of the hub. To improve the purification efficiency, it is necessary to increase the rotation speed of the gas purification disk, which places higher requirements on the rotation speed of the entire gas purification disk. 4. Due to the shape of the spokes, the wind resistance of the gas purification disk is relatively large. To provide sufficient negative pressure, a negative pressure fan with a larger power is required, which will lead to an increase in the cost, volume, and noise of the mechanical oil fume removal device. 5. Once the spokes are deformed, the gaps between the spokes will change. Due to the change in the spoke gaps, some gas will not have the oil droplets, oil mists, and other solid particles removed after passing through the gas purification disk, still causing pollution to the atmosphere.

[0007] Chinese Patent Document No. CN109794102A discloses a gas purification unit, including a central disk and at least 6 spokes. The spokes are arranged in a radially outwardly extending manner on the central disk. The inner ends of the spokes are fixed to the central disk. The central disk is connected to a driving device for driving its rotation. At least one concave guiding groove is provided on one side of the rotation direction of the spokes.

[0008] The above patent documents respectively provide different forms of gas purification disks, but all face the problems mentioned above. The technical solution provided by the present invention can achieve the following technical effects:

[0009] 1. Connected to the hub of the gas purification disk by a clamping method, no fixture is required for fixation, and there are no solder joints. The gas purification disk is convenient to process, safe and reliable to use.

[0010] 2. In the actual use process, the shape of the spokes of the present invention has small wind resistance and good filtering effect, effectively reducing the equipment cost under the condition of the same filtering effect. Summary of the Invention

[0011] The present invention provides a spoke for a gas purification disk, which is used for installing on the hub of the gas purification disk. The spoke can rotate around the center line of the gas purification disk; the cross-sectional shape of the spoke is the same along the center line direction. The spoke is formed with a first surface and a second surface, wherein the intersection line formed by the first surface and the plane perpendicular to the center line of the spoke is the first intersection line, and the first intersection line is in the shape of a function curve; wherein the intersection line formed by the second surface and the plane perpendicular to the center line of the spoke is the second intersection line.

[0012] The spokes for the gas purification disk of the present invention may also be:

[0013] A stop surface is formed at the connection between the spoke and the hub.

[0014] The spoke is symmetric with respect to a symmetry plane, and the symmetry plane is parallel to the plane formed by the center line of the spoke rotating around the center line of the gas purification disk; or the spoke is asymmetric.

[0015] When the spoke rotates, the first surface is the oil fume purification surface, and when the gas purification disk rotates, the first surface collides with oil fume droplets or other particles.

[0016] Wherein the first intersection line and the second intersection line have two intersection points, and the connection line of the two intersection points is parallel to the center line of the gas purification disk.

[0017] Wherein the first intersection line has a protrusion, which is formed by the intersection of a first line segment and a second line segment. The perpendicular distance from the intersection point of the first line segment and the second line segment to the center line of the spoke in a plane perpendicular to the spoke is greater than the perpendicular distance from other points on the first intersection line to the center line of the spoke.

[0018] Wherein the first line segment and the second line segment can be straight line segments, quadratic curves, cubic curves, involute curves and other curve-shaped line segments.

[0019] Wherein the part of the first intersection line other than the first line segment and the second line segment can be a straight line segment or a line segment in the shape of a quadratic curve or a cubic curve, but the shapes of the first line segment and the second line segment are different from the shapes of other parts of the first intersection line other than the first line segment and the second line segment.

[0020] Wherein the second intersection line is a straight line or a line segment substantially parallel to the center line of the gas purification disk.

[0021] Wherein the second intersection line is connected by straight line segments, or by curve segments, or by straight line segments and curve segments.

[0022] Wherein the angle between the tangent of the point on the first intersection line and the symmetry line of the section is variable.

[0023] Wherein the second intersection line is symmetric about the midpoint.

[0024] Wherein the dimension in the width direction of the first intersection line and the second intersection line is a, and the dimension in the thickness direction of the first intersection line and the second intersection line is b. The ratio of a to b ranges from 1.2 to 4, and preferably is 2.

[0025] The range of a can be from 0.5 to 10 millimeters.

[0026] A gas purification disk, which includes the spokes for the gas purification disk of the present invention.

[0027] An air purification device includes the gas purification disc of the present invention and a motor for driving the gas purification disc.

[0028] Through the above technical solutions, the present invention reduces the wind resistance of the gas purification disc and can connect the spokes and the hub without using welding, thereby reducing the overall cost of the device and improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shows a welded gas purification disc in the prior art;

[0030] Figure 2 Shows a schematic diagram of the gas purification disc of the present invention;

[0031] Figure 3 Shows a front view of the spoke of the present invention;

[0032] Figure 4 Shows Figure 3 A partial enlarged view of the spoke;

[0033] Figures 5 - 6 Shows a schematic cross-sectional view of the spoke;

[0034] Figure 7 Shows a three-dimensional view of the spoke (including the stop surface).

[0035] Embodiments of the present invention

[0036] See Figure 1 , Figure 1 Shows a gas purification disc, which is composed of an outer ring 100, spokes 200 and a hub 300. The spokes 200 are respectively welded to the outer ring 100 and the hub 300. Since the spokes 200 are welded to the hub 300, the connection between the spokes 200 and the hub 300 will be heated during the connection process. After cooling, the connection between the spokes and the hub will be deformed to a certain extent. If the spokes are not connected to the outer ring 100 by welding, the entire gas purification disc will have uneven distribution of the spokes in the circumferential direction due to the deformation of the spokes. The uneven distribution of the spokes brings problems such as poor dynamic balance effect and poor gas purification effect. The gas purification disc needs to be fixed on the shaft and driven by the motor. If there are major problems with the dynamic balance, the shaft and the motor are very likely to be damaged.

[0037] As Figure 2 shown, it is a schematic diagram of the gas purification disc of the present invention. In Figure 2 , the spoke 2 has a specific shape, and the spoke 2 is clamped and connected to the hub 3 through the stop surface. In Figure 2In [the situation], since the spoke 2 is not connected to the hub 3 by welding, there is no problem of false welding or loosening of the solder joints in the spoke 2, and the situation where the spoke 2 suddenly falls off during operation and causes harm to the staff will not occur. Another advantage of clamping the spoke 2 to the hub 3 through the stop surface is that the spoke will not be deformed like welding during installation, thus affecting the assembly of the spoke and the hub.

[0038] As Figure 3 shown, it is the front view of the spoke. A section of the spoke connected to the hub is provided with a stop surface 11. The stop surface 11 can be flat or curved; when the stop surface is flat, the stop surface is perpendicular to the center line of the spoke or forms an angle with the center line of the spoke.

[0039] The stop surface can also be a curved surface, as Figure 4 shown; Figure 4 It is Figure 3 a partial enlarged view of the spoke in [the situation]. When the stop surface 11 is a curved surface, preferably, it is a cylindrical curved surface formed along a curve perpendicular to the paper surface as Figure 4 shown. Such a surface is convenient for processing, and when the stop surface and the bearing surface cooperate, a stable stop support mating surface can be formed, thereby reducing problems such as spoke trembling caused by unstable cooperation during the use of the gas purification disc.

[0040] As Figure 5 shown, Figure 5 it shows the cross-sectional shape of the spoke when observed along the Figure 3 A - A direction of [the situation]. Figure 7 It is a schematic diagram of the usage state of the spoke. Figure 7 In [the situation], the spoke is formed with a first surface 21 (not shown) and a second surface 22. The first surface 21 is the oil fume purification surface, and when the gas purification disc rotates, the first surface collides with oil fume droplets or other particles. Refer to Figure 5 , the intersection line formed by the first surface and the line perpendicular to the center line of the spoke is the first intersection line 201, and the function curve of this first intersection line; among them, the second surface forms a first intersection line 202 with the line perpendicular to the center line of the spoke.

[0041] The first intersection line and the second intersection line can have different shapes. The first intersection line is close to a streamlined shape for "impacting" the airflow to be treated; the second intersection line is the back surface of the spoke and does not directly treat the airflow; there are significant differences in their shapes.

[0042] The second intersection line can also be symmetric with the first intersection line with respect to the connection line of the first intersection line and the second intersection line.

[0043] As Figure 5, the spoke 11 is symmetric with respect to a symmetry plane that is parallel to the plane formed by the center line of the spoke rotating around the center line of the gas purification disk. The spoke can also be asymmetric. The symmetry of the spoke with respect to the symmetry plane can make the spoke more stable.

[0044] As Figure 5 , the first intersection line 201 and the first intersection line 202 intersect at both ends to form two intersection points, and the connection line of these two intersection points is parallel to the center line of the gas purification disk; the length of the connection line of these two intersection points is greater than the length of the connection line between any other two points on the first intersection line and the second intersection line.

[0045] The function curve of the first intersection line of the spoke of the present invention also has a protrusion formed by the intersection of a first line segment and a second line segment. The vertical distance from the intersection point of the first line segment and the second line segment to the center line of the spoke on the plane perpendicular to the spoke is greater than the vertical distance from other points on the first intersection line to the center line of the spoke; the protrusion is beneficial to reducing the resistance borne by the gas purification disk during rotation, thereby reducing the power and volume of the driving motor of the gas purification disk, and has a reducing effect on the overall volume and overall cost of the equipment using the gas purification disk.

[0046] The first line segment and the second line segment can be straight line segments or curve-shaped line segments such as quadratic curves, cubic curves, involutes, or their combined line segments. When the first intersection line transitions from the intersection point with the second intersection line to the intersection point of the first line segment and the second line segment, the angle between the tangent of the points on the first intersection line and the symmetry line of the cross-section changes; such a shape of the first intersection line can form an approximately streamlined shape, thus helping to reduce the resistance during the rotation of the gas purification disk.

[0047] For the other parts of the first intersection line except the first line segment and the second line segment, the parts of the first intersection line except the first line segment and the second line segment can be straight line segments or curve-shaped line segments such as quadratic curves and cubic curves, but the shapes of the first line segment and the second line segment are different from the shapes of the other parts of the first intersection line except the first line segment and the second line segment; the curvatures of the other parts of the first intersection line except the first line segment and the second line segment are different from those of the first line segment and the second line segment, and such curvatures should satisfy that when the first intersection line transitions from the intersection point with the second intersection line to the intersection point of the first line segment and the second line segment, the angle between the tangent of the points on the first intersection line and the symmetry line of the cross-section changes.

[0048] The shape of the first intersection line generally presents a "convex" shape. Such a shape enables the rotating spokes to effectively reduce the rotational resistance and also reduce the wind resistance. The reduction of the rotational resistance decreases the energy consumed by the rotation of the spokes; the reduction of the wind resistance decreases the energy consumed by the negative pressure fan. Compared with the spokes with a rectangular cross-section, the rectangular spokes have a greater rotational resistance and a particularly large wind resistance; although the equivalent "impact" length of the rectangular spokes is longer, the higher the rotational speed of the rectangular spokes, the greater the wind resistance, which brings problems such as the need for the negative pressure fan to provide a much higher negative pressure and the motor power required to drive the gas purification disk to rotate to be greater. Although the equivalent impact length is higher, it cannot improve the purification efficiency. Therefore, the purification efficiency of the rectangular spokes is too low and is unacceptable compared with the spokes of the cross-sectional shape of the present invention.

[0049] The curved shape of the first intersection line does not mean the exclusion of the existence of straight line segments on the first intersection line. As long as the first intersection line is not composed only of straight line segments with the same slope, the first intersection line is considered to have a curved shape.

[0050] The second intersection line can be straight or composed of a connection of curved line segments and straight line segments. As Figure 5 shown, the second intersection line includes multiple line segments. These line segments generally present a shape that causes two recessed parts to appear on the back of the spoke. There is a protruding part between the two recessed parts. Such a shape of the second intersection line enables the air flow to flow towards the recessed parts on the back of the spoke during the operation of the spoke, thereby reducing the wind resistance and reducing the power requirement of the negative pressure fan under the same conditions, and reducing the overall functional cost and power consumption of the purification equipment. The second intersection line can also cause one or more recessed parts to appear on the back of the spoke.

[0051] When the second intersection line is straight, since the shape of the second surface of the spoke is relatively simple, the processing of the spoke becomes very simple, and the yield rate of the spoke is also greatly improved. When the second intersection line is parallel to the center line of the gas purification disk, when the spoke processes the gas flow to be purified, the flow direction of the gas flow is more stable and reliable, and it will not affect the wind resistance of the gas purification disk.

[0052] Whether the second intersection line is straight or composed of a connection of multiple straight line segments and / or multiple curved line segments, the second intersection line is symmetric about the midpoint.

[0053] The second intersection line can also be symmetric with respect to the first intersection line with respect to the connection line of the first intersection line and the second intersection line; in this case, the spoke can play the same purification role whether it rotates forward or backward.

[0054] The first intersection line removes droplets and solid particles by impinging on the air flow. The first intersection line preferably has a functional curve shape composed of one or more curved line segments. Especially the curved line segment shape of a continuous function that is basically "convex". As Figure 6, the dimensions of the first intersection line and the second intersection line in the width direction are a, and the dimensions of the first intersection line and the second intersection line in the thickness direction are b; the ratio of a to b is between 1.2 and 4; the larger the ratio of a to b, the smaller the circumferential dimension occupied by the spoke on the hub under the condition of the same gas treatment surface; however, if the ratio of a to b is too large, the rigidity of the spoke is insufficient, and it is easy to bend, and during operation, the possibility of the spoke shaking and generating noise is also greater. Therefore, a to b should be within a suitable range; according to the research and experiments of the inventor, the optimal ratio of a to b is 2, and the value of a to b can also be 1.6, 1.8, 2.2, 2.4, 2.8, 3.2, 3.5, 3.7. The range of a can be 0.5 to 10 mm, specifically 1, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 mm.

[0055] Figure 6 The approximate size shape of a≈2b presented by the spoke shape in [reference] enables the spoke to have a longer oil fume purification depth under the condition of the same spoke installation density; combined with the shapes of the first intersection line and the second intersection line of the spoke, the spoke can have a smaller rotational resistance and a smaller wind resistance when the purification depth is longer.

[0056] Experimental results

[0057] In order to test the purification effect of the present invention, we conducted experiments based on the following conditions:

[0058] The diameter of the gas purification disk is: 30 cm; the outer diameter of the hub of the gas purification disk is 13 cm; the rotational speed of the gas purification disk is: 1300 revolutions per minute. Under non-diffusion conditions, oil fume is generated by an oil fume simulation generating device, and the oil fume generated by the generating device is treated by a purification device equipped with a gas purification disk. The experimental time is 11 minutes, the oil fume simulation generating device generates 2 g of oil fume per minute, and the oil fume purification device generates a total of 40 g of pollutant-containing oil fume gas within 10 minutes; the oil fume purification device operates for a total of 11 minutes. A non-woven fabric sheet with a diameter of 10 cm is fixedly arranged 5 cm behind the gas purification disk. The weight of the clean non-woven fabric is weighed before the test, and the weight of the non-woven fabric is weighed after the test. A decibel meter is arranged 20 cm below the gas purification disk.

[0059] In the embodiment, except for the circular spokes, the ratio of a to b of the used spokes is 2.

[0060] The variables of the test are gas flow rate, the number and shape of the spokes of the gas purification disk, and the test results are as follows:

[0061]

[0062] The above purification rate calculation formula is as follows: Reduction amount of pollutants / Total amount of pollutants.

[0063] As can be seen from the above table, the gas purification disk applying the spokes of the present invention has a high purification rate and good purification effect. The reason lies in that: The rotating spokes are used to remove liquid droplets and solid particulate matters in the gas, which utilizes the spokes rotating to impact the heavier liquids or particles in the gas; during the impact process, the surface of the spoke that mainly plays the impact role is the surface of the spoke in the rotating direction; for a circular spoke, the front half of the surface of the spoke in the rotating direction is the surface that mainly plays the impact role. For example, for a spoke with a diameter of x, along the diameter direction of the gas purification disk, the effective impact length is x / 2. When the effective impact length is determined, the number of spokes set is limited by the diameter of the hub of the gas purification disk. Assuming the hub diameter is d, then the number of spokes must be less than πd / x. For example, in the case where the above hub diameter is 13 cm and the spoke diameter is 2 mm, the limit value of the number of spokes is π*130 / 2≈204, that is to say, it is absolutely impossible to exceed 204 spokes; since the hub diameter is 13 cm and the spokes also need to penetrate into the hub for a certain length, actually 180 spokes are already the limit value. Once the hub diameter is determined, the upper limit of the number of spokes is determined, and the gap between adjacent spokes is also determined. In this case, at a certain gas flow rate, the gas purification disk needs to have a certain rotational speed, and the rotational speed needs to meet the requirement of being able to impact all the gas flowing through the gap within a certain time. If the gas flow rate is large, then when the effective impact length and the gap between adjacent spokes are determined, the rotational speed of the gas purification disk needs to be large. Although some problems can be solved by increasing the rotational speed, there are also the following problems: The increase in rotational speed is limited, and the rotational speed is limited by the rotational speed of the motor. In addition, if the rotational speed is too high, the energy consumption is too large and the noise is too large. Due to the limited rotational speed, it is difficult to obtain a good purification effect in some occasions with serious pollution.

[0064] In the technical solution proposed by the present invention, assuming b = x, then a≈2x, and the equivalent effective impact length is x. At this time, the upper limit of the number of spokes is still a certain value less than πd / x. When the number of spokes remains unchanged, the effective impact length of the spokes of the present invention becomes twice the original. In this way, when the gas flow rate is constant, the rotational speed of the gas purification disk can be reduced to about half of that of the circular spokes.

[0065] The above explains the reason why in the experiment, the purification rates of Examples 1, 2, and 3 of the present invention are higher, while the purification rates of Examples 4 - 8 are different but significantly lower than those of Examples 1 - 3 of the present invention.

[0066] In addition, since the spokes are circular, the possibility of elastic deformation in all directions is very high. Therefore, when the particulate matter or droplets in the oil fume hit the spokes, they will jitter irregularly. Under the condition of high-speed rotation, they will rub against the air flow, thus generating a lot of noise.

[0067] After adopting the spoke structure of the present invention, generally speaking, the purification disc can use fewer spokes and lower rotational speed, can obtain higher purification efficiency, and effectively reduces the noise.

[0068] The gas purification disc of the present invention effectively reduces the overall installation cost of the gas purification disc, reduces the overall cost of the purification equipment equipped with the gas purification disc, and improves the purification efficiency.

[0069] The above content is a further detailed description of the present invention in combination with specific preferred technical solutions. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as belonging to the protection scope of the present invention.

Claims

1. A spoke for a gas purification disk, which is used to be mounted on the hub of the gas purification disk, and the spoke can rotate around the center line of the gas purification disk; characterized in that: The cross-sectional shapes of the spokes are the same along the centerline direction. The spokes are formed with a first surface and a second surface. The intersection line formed by the first surface and the plane perpendicular to the centerline of the spoke is the first intersection line, and this first intersection line is in the shape of a function curve. The intersection line formed by the second surface and the plane perpendicular to the centerline of the spoke is the second intersection line. A stop surface is formed at the connection between the spoke and the hub. When the spoke rotates, the first surface is the oil fume purification surface. When the gas purification disk rotates, the first surface collides with oil fume droplets or other particles. The first intersection line and the second intersection line have two intersection points. The connection line of the two intersection points is parallel to the centerline of the gas purification disk, and the length of the connection line of the two intersection points is greater than the length of the connection line between any other two points on the first intersection line and the second intersection line. The first intersection line has a protrusion, which is formed by the intersection of a first line segment and a second line segment. The vertical distance from the intersection point of the first line segment and the second line segment to the centerline of the spoke in the plane perpendicular to the spoke is greater than the vertical distance from other points on the first intersection line to the centerline of the spoke. The first line segment and the second line segment are straight line segments or quadratic curves or cubic curves or involute curve-shaped line segments or a combination of them. The other parts of the first intersection line except the first line segment and the second line segment are straight line segments or quadratic curve or cubic curve-shaped line segments, but the shapes of the first line segment and the second line segment are different from the shapes of the other parts of the first intersection line except the first line segment and the second line segment. When the first intersection line transitions from the intersection point with the second intersection line to the intersection point of the first line segment and the second line segment, the angle between the tangent of the points on the first intersection line and the symmetry line of the cross-section is variable. The dimension in the width direction of the first intersection line and the second intersection line is a, and the dimension in the thickness direction of the first intersection line and the second intersection line is b. The ratio range of a to b is between 1.2 and 4.

2. The spoke for a gas purification tray according to claim 1, wherein: The spoke is symmetric with respect to a symmetry plane parallel to the plane formed by the centerline of the spoke rotating around the centerline of the gas purification disk; or the spoke is asymmetric.

3. The spoke for a gas purification tray according to claim 1, characterized in that: The second intersection line is a line segment parallel to the centerline of the gas purification disk.

4. The spoke for a gas purification tray according to claim 1, characterized in that: The second intersection line is formed by connecting straight line segments, or by connecting curve segments, or by connecting straight line segments and curve segments.

5. The spoke for a gas purification tray according to claim 4, wherein: The second intersection line is symmetric about the midpoint.

6. The spoke for a gas purification tray according to claim 1, characterized in that: The ratio of a to b is 2.

7. The spoke for a gas purification tray according to claim 1, wherein: The range of a is from 0.5 to 10 millimeters.

8. A gas purification disk, comprising the spoke for the gas purification disk defined in any one of claims 1 - 7.

9. An air purification device, comprising the gas purification disk as described in claim 8 and a motor for driving the gas purification disk as described in claim 8.

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