Impeller assembly, fan and oil smoke pumping and discharging equipment

Abstract

The utility model belongs to the technical field of fans, and particularly provides an impeller assembly, a fan and oil smoke pumping and discharging equipment. A middle disc is coaxially arranged in the impeller body and provided with a conical ring part coaxial with the impeller body, the small end of the conical ring part faces the air inlet end of the impeller body, and the large end of the conical ring part and an inner ring of the impeller body are arranged in a spaced mode. A plurality of pressurizing blades are convexly arranged on the peripheral wall of the conical ring part at intervals around the rotating axis of the impeller assembly, the pressurizing blades extend in an arc shape in the circumferential direction of the conical ring part from the first ends to the second ends, the first ends of the pressurizing blades are close to the small end of the conical ring part, and the second ends are close to the large end of the conical ring part; the extending direction of the pressurizing blades from the first ends to the second ends is opposite to the rotating direction of the impeller assembly. The height of the pressurizing blades protruding out of the conical ring part is gradually increased from the first end to the second end of the conical ring part. The utilization rate of air kinetic energy in the impeller body can be increased, the air volume is increased, and the fan performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to an impeller assembly, a fan, and an oil fume extraction device. Background Technology

[0002] Range hoods are common kitchen appliances used to extract cooking fumes and purify the air in the kitchen. The centrifugal fan is one of the core components of a range hood, and it directly determines the range hood's fume extraction capacity and efficiency.

[0003] Existing centrifugal fans typically include a volute, an impeller, and a drive motor. One end of the volute has an air inlet and the side has an air outlet. The impeller is installed inside the volute. The drive motor drives the impeller to rotate to create a negative pressure at the air inlet, thereby causing the airflow to enter the volute through the air inlet and then be thrown out of the air outlet by the impeller.

[0004] Existing centrifugal fans typically improve their performance by designing parameters such as volute shape, impeller blade profile, and impeller speed. However, due to extensive research on impeller and volute shapes and the maturity of related design schemes, the optimization effects of these improvements are not significant. Consequently, it is difficult to significantly improve the performance of centrifugal fans through the structural design of the volute and impeller. At the same time, because the impeller blades are located on the outermost part of the impeller and outside the air inlet, the airflow velocity at the center of the impeller is low, which is not conducive to fully utilizing the air volume at the air inlet. Utility Model Content

[0005] One of the technical problems solved by this utility model is to provide an impeller assembly that can effectively solve the problem that the performance of the fan is difficult to improve due to the existing method of improving the fan performance by designing the profile of the impeller blades, thereby increasing the air volume of the impeller assembly during operation and improving the exhaust performance of the impeller assembly.

[0006] The second technical problem solved by this utility model is to provide a centrifugal fan that can effectively solve the problem that the performance of existing centrifugal fans is difficult to significantly improve by improving the parameters of the impeller and volute, thereby improving the operating performance of the centrifugal fan.

[0007] The third technical problem solved by this utility model is to provide an oil fume extraction device that can effectively solve the problem that the extraction capacity of existing oil fume extraction devices is difficult to improve due to the difficulty in significantly improving the performance of the fan, thereby improving the extraction performance of the oil fume extraction device.

[0008] The first technical problem mentioned above is solved by the following technical solution:

[0009] An impeller assembly includes an annular impeller body, a central disk coaxially disposed inside the impeller body, the central disk having a conical ring portion coaxial with the impeller body, the small end of the conical ring portion facing the air inlet end of the impeller body, and the large end of the conical ring portion being spaced apart from the inner ring of the impeller body;

[0010] The outer peripheral wall of the conical ring portion is provided with a plurality of booster blades at intervals around the rotation axis of the impeller assembly. The booster blades extend in an arc shape from the first end to the second end along the circumference of the conical ring portion. The first end of the booster blade is close to the small end of the conical ring portion and the second end is close to the large end of the conical ring portion. The extension direction of the booster blades from the first end to the second end is opposite to the rotation direction of the impeller assembly.

[0011] The height of the booster blade protruding from the conical ring gradually increases from the first end to the second end of the conical ring.

[0012] Compared with the prior art, the impeller assembly described in this utility model has the following advantages: By setting a central disk inside the impeller body, the airflow flowing into the center of the impeller body can be pressurized by the rotation of the pressurizing blades on the central disk, and the pressurized airflow is thrown into the flow channel between the outer blades to reduce the loss of air kinetic energy. Thus, the air volume is increased while the operating speed of the impeller assembly remains unchanged. Since the pressurizing blades extend from the first end to the second end towards the lower end to the large end of the conical ring, and the small end of the conical ring faces the air inlet end of the impeller body, it is beneficial for the first end of the pressurizing blades to be set close to the air inlet end of the impeller body to enhance the guiding effect of the airflow entering the center of the impeller body. At the same time, the second end of the pressurizing blades can be set closer to the other end of the impeller body opposite to the air inlet end, thereby ensuring the pressurization effect of the airflow and better directing the airflow towards the other end closer to the impeller body, improving the airflow at the impeller body. Uniform airflow further enhances air volume and reduces noise during airflow. Since the airflow gradually accelerates as it flows from the center of the impeller body outwards, the height of the booster blades is set to gradually increase from the first end to the second end. This increases the windward area of ​​the booster blades from the first end to the second end, thus matching the airflow velocity with the airflow area and reducing noise caused by sudden changes in flow velocity. Furthermore, this design better ensures the pressurization and diversion of the airflow, while also increasing the overall structural strength and rigidity of the booster blades, reducing the risk of blade breakage, and improving the operational reliability of the impeller assembly. Moreover, because the booster blades extend in an arc shape along the circumference of the conical ring from the first end to the second end, the structure of the booster blades is simple, the manufacturing cost is low, and the arc-shaped blades reduce the resistance of the airflow passing through them, enhancing the pressurization and diversion effect, increasing air volume, and reducing the noise during impeller assembly operation.

[0013] In one embodiment, the height of the first end of the booster blade is W1, where 0 < W1 ≤ 2 mm; and / or, the height of the second end of the booster blade is W2, where 8 mm ≤ W2 ≤ 12 mm.

[0014] In one embodiment, the distance between the booster blades and the plane containing the air inlet end of the impeller body gradually increases from the first end to the second end along the axial direction of the impeller assembly.

[0015] In one embodiment, the height of the impeller body is H along the axial direction of the impeller assembly, the distance between the first end of the booster blade and the plane where the air inlet is located is d1, and the distance between the second end of the booster blade and the plane where the air inlet is located is d2.

[0016] 0.3≤d1 / H≤0.5, and / or, d2-d1=5mm~20mm.

[0017] In one embodiment, the end edge of the second end of the booster blade is inclined relative to the rotation axis, and one end of the end edge connected to the conical ring portion is closer to the rotation axis than the other opposite end;

[0018] And / or, the booster blade has a windward side disposed opposite to the conical ring portion, the windward side extending from the first end to the second end, and the windward side and the end edge of the second end are connected by a smooth arc transition.

[0019] In one embodiment, the first ends of all the booster blades are located on a first base circle, and the second ends of all the booster blades are located on a second base circle. The first base circle and the second base circle are coaxially arranged with the impeller body, and the radius of the inner circle of the impeller body is R0.

[0020] The radius of the first base circle is R1, 0.4≤R1 / R0≤0.6; and / or, the radius of the second base circle is R2, 0.75≤R2 / R0≤0.88.

[0021] In one embodiment, the middle plate includes a coaxially arranged mounting plate and a booster plate. The mounting plate is inserted into the outer blades of the impeller body of all impeller bodies. The booster plate is arranged in a ring and is detachably installed on the side of the mounting plate facing the air inlet. The booster plate has the booster blades and the conical ring portion.

[0022] In one embodiment, the mounting plate includes a central disc portion, a frustum portion, and an outer ring portion that are coaxially connected from the inside to the outside. The outer ring portion and the central disc portion are both perpendicular to the rotation axis of the impeller assembly. The frustum portion is fitted and sleeved on the outside of the frustum portion, and the outer blades pass through the outer ring portion.

[0023] The small end of the conical ring is connected to a fixed ring, which is fitted to and detachably connected to the central disk; and / or, the large end of the conical ring extends outward to form a transition ring, which is smoothly connected to the conical ring and is fitted to the outer ring.

[0024] The second technical problem mentioned above is solved by the following technical solution:

[0025] A fan includes a volute and a drive motor mounted on the volute, and further includes an impeller assembly as described above, the impeller assembly being mounted inside the volute, and the motor shaft of the drive motor being connected to the central disk.

[0026] Compared with the prior art, the fan described in this utility model has the following advantages: by adopting the above-mentioned impeller assembly, the fan air volume can be effectively increased, the air kinetic energy loss can be reduced, and the operating performance of the fan can be improved while keeping the fan speed constant.

[0027] The second technical problem mentioned above is solved by the following technical solution:

[0028] An oil fume extraction device, comprising the fan described above.

[0029] Compared with the prior art, the fume extraction equipment of this utility model has the following advantages: by adopting the above-mentioned fan, the fume extraction capacity can be significantly improved, and the performance of the fume extraction equipment can be improved. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the fan provided in Embodiment 1 of this utility model;

[0031] Figure 2 A cross-sectional view of the fan provided in Embodiment 1 of this utility model;

[0032] Figure 3 This is a schematic diagram of the impeller assembly provided in Embodiment 1 of the present utility model;

[0033] Figure 4 A top view of the impeller assembly provided in Embodiment 1 of this utility model;

[0034] Figure 5 A cross-sectional view of the impeller assembly provided in Embodiment 1 of this utility model;

[0035] Figure 6 A cross-sectional view of the impeller assembly provided in Embodiment 1 of this utility model;

[0036] Figure 7 for Figure 6 A magnified view of a section at point I;

[0037] Figure 8 This is a schematic diagram of the structure of the pressure booster provided in Embodiment 1 of this utility model;

[0038] Figure 9 This is a design schematic diagram of the pressure booster provided in Embodiment 2 of this utility model;

[0039] Figure 10 A schematic diagram of the simulation results of the fan provided in Embodiment 2 of this utility model;

[0040] Figure 11 A simulated structural diagram of a fan without booster blades, provided for existing technology.

[0041] Label Explanation:

[0042] 100. Impeller assembly; 200. Volute casing; 201. Main air inlet; 202. Air outlet; 300. Drive motor; 301. Motor housing; 302. Motor shaft; 303. Fixing lug; 400. Mounting bracket; 401. Mounting ring; 402. Connecting arm; 500. Locking nut; 600. Limiting rod;

[0043] 1. Middle plate; 11. Pressure booster plate; 111. Pressure booster blade; 1111. First end; 1112. Second end; 1113. Windward side; 1114. End edge; 112. Conical ring; 113. Fixing ring; 114. Transition ring; 12. Mounting plate; 121. Central plate; 1211. Central recess; 122. Frustum; 123. Outer ring;

[0044] 2. Impeller body; 21. Outer blades; 22. End retaining ring;

[0045] 3. Fixing base; 31. Fixing disc; 32. Fixing sleeve;

[0046] 101. First base circle; 102. Second base circle; 103. Impeller inner ring. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0048] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", 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 application 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 application.

[0049] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0051] This embodiment provides a fan that can be used in fume extraction equipment to extract fumes, and can also be used in other scenarios where airflow is required.

[0052] like Figure 1 and Figure 2 As shown, in this embodiment, the fan includes a volute 200, an impeller assembly 100, and a drive motor 300. The volute 200 has a main air inlet 201, an air chamber, and an air outlet 202 connected in sequence. The impeller assembly 100 is rotatably mounted inside the air chamber and is coaxially arranged with the main air inlet 201. The drive motor 300 is mounted on the volute 200 and drives the impeller assembly 100 to rotate, guiding airflow sequentially through the main air inlet 201, the interior of the impeller assembly 100, and the air chamber before exiting through the air outlet 202.

[0053] The impeller assembly 100 includes an impeller body 2 and a central disk 1. The impeller body 2 is annularly arranged and has multiple outer blades 21 spaced circumferentially. The central disk 1 is coaxially arranged inside the impeller body 2. The central disk 1 has a conical ring portion 112 coaxial with the impeller body 2. The small end of the conical ring portion 112 faces the air inlet end of the impeller body 2, and the large end of the conical ring portion 112 is spaced apart from the inner ring of the impeller body 2. The outer peripheral wall of the conical ring portion 112 is provided with multiple pressurizing blades 111 protruding at intervals around the rotation axis of the impeller assembly 100. The booster blade 111 extends in an arc shape along the circumference of the conical ring portion 112 from the first end 1111 to the second end 1112. The first end 1111 of the booster blade 111 is close to the small end of the conical ring portion 112 and the second end 1112 is close to the large end of the conical ring portion 112. The extension direction of the booster blade 111 from the first end 1111 to the second end 1112 is opposite to the rotation direction of the impeller assembly. The height of the booster blade 111 protruding from the conical ring portion 112 gradually increases from the first end 1111 to the second end 1112 of the conical ring portion 112.

[0054] The impeller assembly 100 and fan provided in this embodiment, by setting a central disk 1 inside the impeller body 2, can pressurize the airflow flowing into the center of the impeller body 2 through the rotation of the pressurizing blades 111 on the central disk 1, and throw the pressurized airflow into the flow channel between the outer blades 21, thereby reducing the loss of air kinetic energy. Thus, the air volume is increased while the operating speed of the impeller assembly 100 remains unchanged. Since the pressurizing blades 111 extend from the first end 1111 to the second end 1112 towards the small end to the large end of the conical ring portion 112... The conical ring 112 is extended, and the small end of the conical ring 112 faces the air inlet end of the impeller body 2. This allows the first end 1111 of the booster blade 111 to be positioned close to the air inlet end of the impeller body 2 to enhance the guiding effect on the airflow entering the center of the impeller body 2. At the same time, the second end 1112 of the booster blade 111 can be positioned closer to the other end of the impeller body 2 opposite to the air inlet end. This ensures that while maintaining the boosting effect on the airflow, the airflow is better directed towards the other end of the impeller body 2, improving the uniformity of the airflow in the axial direction of the impeller body 2. Firstly, the airflow is increased, reducing noise during airflow. Secondly, since the airflow gradually accelerates as it flows from the center of the impeller body 2 to both sides, the height of the booster blades 111 is set to gradually increase from the first end 1111 to the second end 1112. This increases the windward area of ​​the booster blades 111 from the first end 1111 to the second end 1112, thereby matching the airflow velocity with the airflow area of ​​the booster blades 111, reducing noise caused by sudden changes in flow velocity. Moreover, this design better ensures the pressurization and diversion of the airflow. This not only improves the overall structural strength and rigidity of the booster blades 111, but also reduces the risk of blade breakage and improves the operational reliability of the impeller assembly 100. Furthermore, since the booster blades 111 extend in an arc shape from the first end 1111 to the second end 1112 along the circumference of the conical ring portion 112, the structure of the booster blades 111 is simple and the processing cost is low. Moreover, the arc-shaped blades can reduce the resistance of airflow when it passes through the booster blades 111, improve the booster airflow diversion effect, increase the air volume, and reduce the noise of the impeller assembly 100 during operation.

[0055] like Figure 2 As shown, to improve the ease of installation of the drive motor 300, an auxiliary air inlet is provided on the side of the volute 200 opposite to the main air inlet 201, allowing for easy assembly and disassembly of the fan auxiliary air inlet from the impeller assembly 100. Simultaneously, during impeller assembly 100 operation, some airflow can enter the air chamber through the auxiliary air inlet and flow to the air outlet 202 via the flow channel between the auxiliary air inlet and the outer blades 21, increasing the air intake volume of the impeller assembly 100 during operation.

[0056] The fan includes a mounting bracket 400, which is spaced apart on the side of the mounting plate 12 away from the air inlet end and is connected to the volute 200. The housing of the drive motor 300 is mounted on the mounting bracket 400. The motor shaft 302 of the drive motor 300 passes through the central plate 1 and is coaxially connected to the central plate 1. Thus, when the drive motor 300 is running, the rotation of the motor shaft 302 drives the impeller assembly 100 to rotate.

[0057] The mounting bracket 400 includes a mounting ring 401 and multiple connecting arms 402 spaced circumferentially along the mounting ring 401. The mounting ring 401 is located inside the air cavity, and its outer diameter is smaller than the inner diameter of the inner ring of the impeller body 2. The connecting arms 402 connect the mounting ring 401 and the volute 200. The motor housing 301 has outwardly protruding fixing ears 303, multiple of which are spaced circumferentially along the motor shaft 302 and are detachably connected to the mounting ring. This structure of the mounting bracket 400 creates an airflow channel between adjacent connecting arms 402, allowing some airflow to enter the impeller body 2 through an opening on the other side of the volute 200.

[0058] The specific structure of the drive motor 300 can be set with reference to the structure of the drive motor 300 in the existing fan. This is not the focus of this utility model and will not be described in detail here.

[0059] It is worth noting that the impeller body 2 includes two end fixing rings 22 that are arranged opposite to each other and spaced apart. The two ends of the outer blades 21 are respectively connected to the two end fixing rings 22, and the end face of the end fixing ring 22 near the main air inlet 201 is the end face of the air inlet. The structure of the impeller body 2 can be set with reference to the prior art, which is not the focus of this utility model and will not be limited or described in detail here.

[0060] like Figure 3 and Figure 4 As shown, multiple booster blades 111 are evenly spaced along the circumference of the central disk 1 to better ensure the uniformity of airflow in the circumference of the impeller assembly 100 and reduce the processing difficulty of the central disk 1.

[0061] To improve the processing convenience of the central disc 1, the first end 1111 of all the booster blades 111 is located on the first base circle 101, and the second end 1112 of all the booster blades 111 is located on the second base circle 102. The first base circle 101, the second base circle 102 and the impeller body 2 are coaxially arranged, and the inner diameters of the first base circle 101, the second base circle 102 and the impeller body 2 gradually increase.

[0062] Define the inner diameter of the impeller inner ring 103 of the impeller body 2 as R0, the radius of the first base circle 101 as R1, and the radius of the second base circle 102 as R2.

[0063] In one embodiment, 0.4≤R1 / R0≤0.6 is used to avoid the first end 1111 of the booster blade 111 being too far from the rotation axis of the impeller assembly 100, resulting in a short effective length of the booster blade 111, which would cause kinetic energy loss at the center and also easily cause sudden speed changes and generate additional noise. Since the linear velocity of the airflow is smaller the closer it is to the rotation axis, if R1 is too small, it will also result in a lower kinetic energy increase, which would lead to material waste.

[0064] In one embodiment, 0.75 ≤ R2 / R0 ≤ 0.88 is used to prevent the first end 1111 of the booster blade 111 from being too far from the rotation center of the impeller assembly 100, which would prevent the air guided by the central disk 1 from flowing evenly into the gap between the outer blades 21, and also to avoid the distance between the first end 1111 of the booster blade 111. Further, 0.65 ≤ R1 / R2 ≤ 0.75.

[0065] Specifically, in one embodiment, 105mm≤R0≤120mm, 58mm≤R1≤68mm, and 80mm≤R2≤95mm.

[0066] like Figure 4 and Figure 5 As shown, along the axial direction of the impeller body 2, the distance between the booster blade 111 and the plane where the air inlet end of the impeller body 2 is located gradually increases from the first end 1111 to the second end 1112. This allows the booster blade 111 to be further away from the air inlet end from the first end 1111 to the second end 1112. That is, the booster blade 111 has a windward side 1113 that is arranged opposite to the conical ring portion 112. The windward side 1113 extends from the first end 1111 to the second end 1112 and is arranged towards the air inlet end. The windward side 1113 is inclined relative to the plane perpendicular to the rotation axis of the impeller body 2 and passes through the plane of the first end 1111. This allows the airflow entering from the air inlet end to flow along the booster blade 111 better, improving the airflow guidance effect and reducing the noise of the airflow passing through the impeller assembly.

[0067] Define the height of the impeller body 2 as H, the distance between the first end 1111 of the booster blade 111 and the plane where the air inlet end of the impeller body 2 is located as d1, the distance between the second end 1112 of the booster blade 111 and the plane where the air inlet end of the blade body 2 is located as d2, and the axial height of the booster blade 111 as d3.

[0068] In one embodiment, 0.3 ≤ d1 / H ≤ 0.5, to prevent the pressurizing blades 111 from being too close to the main air inlet 201, which would cause the central plate 1 to directly throw the airflow flowing into the impeller body 2 out of the impeller body 2. It also prevents the pressurizing blades 111 from being too far from the main air inlet 201, which would cause a large amount of air to enter the flow channel between the outer blades 21 directly without being pressurized by the central plate 1, thus resulting in air kinetic energy loss. This configuration provides better airflow pressurization and diversion effects. Further, 0.15 ≤ d3 / H ≤ 0.35.

[0069] In one embodiment, d2-d1 = 5mm to 20mm, which can improve the flow diversion effect of the booster blade 111 while reducing the taper requirement of the cone ring 112 and improving the overall structural rationality of the middle plate 1.

[0070] To further reduce noise during airflow, in one embodiment, the windward side 1113 and the end edge 1114 of the second end 1112 are connected by a smooth arc transition, which allows the airflow to flow smoothly along the windward side 1113, avoiding the generation of local eddies, and also avoiding the generation of sharp edges on the pressurizing blades 111.

[0071] In one embodiment, the end edge 1114 of the second end 1112 of the booster blade 111 is inclined relative to the axis of rotation, and one end of the end edge 1114 connected to the conical ring portion 112 is closer to the axis of rotation than the other end. This arrangement can improve the noise when the airflow exits the second end 1112 of the booster blade 111.

[0072] The middle plate 1 has a guide surface coaxially arranged with the impeller body 2. The small end of the guide surface is set towards the air inlet end of the impeller body 2, and the large end of the guide surface is set away from the air inlet end. The booster blade 111 protrudes from the guide surface, which facilitates the setting of the booster blade 111 extending from the first end 1111 to the second end 1112 away from the air inlet end, simplifying the structure of the middle plate 1 and reducing the processing difficulty of the middle plate 1.

[0073] The angle between the guide surface and the axis of rotation is 40° to 50°. This angle setting can effectively increase the gradient pressure of the airflow, so that the airflow in the middle can flow more and more smoothly along the middle plate 1 to the outer blade 21, increasing the intake air volume and reducing the intake noise.

[0074] Definition: On the projection plane perpendicular to the rotation axis of the impeller body 2, the projection of the rotation axis is O, the projection of the first end 1111 of the booster blade 111 is B, the orthographic projection of the second end 1112 of the booster blade 111 is C, the angle between the tangent of point B on the booster blade 111 and the tangent of point B on the first base circle 101 is β1, and the angle between the tangent of point C on the booster blade 111 and the tangent of point C on the second base circle 102 is β2.

[0075] In one embodiment, the angle settings of β1 and β2 are 10°≤β1≤15° and / or 22°≤β2≤27°, which enable the booster blades 111 to have better airflow boosting and diversion effects when rotating, and reduce the noise of the middle plate 1 during operation.

[0076] In one embodiment, the height of the first end 1111 of the booster blade 111 is W1, and the height of the second end 1112 of the booster blade 111 is W2, where W2 is less than d2, so that the booster blade 111 gradually moves away from the air inlet of the impeller body 2 from the first end 1111 to the second end 1112, and simplifies the structure of the booster blade 111, reducing the difficulty of setting up the middle disk 1.

[0077] 0 < W1 ≤ 2 mm, and / or 8 mm ≤ W2 ≤ 12 mm. The value setting of W1 makes the thickness of the first end 1111 of the middle disk 1 smaller, which is conducive to gradually guiding the airflow at the center of the impeller body 2 to flow towards the middle disk 1, improving the airflow pressurization and diversion effect, and also reducing the noise generated by the middle disk 1 when disturbing the airflow. The value setting of W2 can avoid the pressurization effect of the pressurizing blade 111 being too small due to the height of the second end 1112 of the pressurizing blade 111 being too small, and at the same time avoid the pressurizing air volume being too large due to the height of the second end 1112 of the pressurizing blade 111 being too large, which would cause a sharp increase in the pressurized air volume, thereby causing the air volume in the flow channel between the outer blades 21 to be uniform, which would cause the impeller assembly 100 to run unstablely and have abnormal noise, thus improving the operating stability of the impeller assembly 100 and reducing the noise of the impeller assembly 100 during operation.

[0078] like Figures 6 to 8 As shown, to improve the ease of processing and setting of the booster blades 111, the intermediate disk 1 includes a coaxially connected mounting disk 12 and booster blades 11. The outer side of the mounting disk 12 is inserted into all the outer blades 21 to achieve circumferential and radial positioning of the intermediate disk 1 and the outer blades 21 in the impeller assembly 100. The booster blades 11 are detachably mounted on the side of the mounting disk 12 facing the air inlet end, and the booster blades 11 have the aforementioned booster blades 111 and conical ring portions 112. By setting the intermediate disk 1 to be detachably connected to the booster blades 11 and the mounting disk 12, the mounting disk 12 and the booster blades 11 can be processed separately, reducing the structural complexity of individual parts of the booster blades 11 and the mounting disk 12, and reducing processing costs. Moreover, this setting allows for the replacement of the booster blades 11 without changing the assembly structure of the mounting disk 12 and the impeller body 2, thereby facilitating the testing of the fan performance by designing different booster blades 11, and reducing the processing and testing costs of the impeller assembly 100 and the fan. Furthermore, a mounting shaft hole is provided at the center of the mounting plate 12.

[0079] The mounting plate 12 includes a central plate portion 121, a frustum portion 122, and an outer ring portion 123 connected sequentially from the inside to the outside. The conical ring portion 112 is fitted and sleeved on the outer side of the frustum portion 122 to facilitate the installation and positioning of the booster plate 11 on the mounting plate 12. The central plate portion 121 has a mounting shaft hole at its center to facilitate the cooperation between the mounting plate 12 and the drive assembly. All outer blades 21 pass through the outer ring portion 123 to facilitate the assembly between the outer blades 21 and the mounting plate 12.

[0080] To improve the ease of installation of the booster plate 11 on the mounting plate 12, in one embodiment, the booster plate 11 further includes a fixing ring portion 113 connected to the small end of the conical ring portion 112. The fixing ring portion 113 is fitted against the central plate portion 121, and the fixing ring portion 113 is detachably connected to the central plate portion 121. By providing the fixing ring portion 113, it is convenient to achieve the connection between the two, and it is also convenient to achieve the axial positioning and limiting of the booster plate 11 and the mounting plate 12, ensuring the assembly stability and reliability of the booster plate 11 and the mounting plate 12.

[0081] Specifically, the fixed disk portion 31 and the central disk portion 121 are connected by fastening threaded parts passing through them. Preferably, multiple fastening threaded parts are provided at circumferential intervals along the central disk portion 121 to ensure the assembly stability of the two.

[0082] In one embodiment, a transition ring 114 extends outward from the large end of the conical ring portion 112. The transition ring 114 fits against the outer ring portion 123, and the transition ring 114 and the conical ring portion 112 are connected by an arc transition. The provision of the transition ring 114 facilitates the guidance of the airflow flowing from the second end 1112 of the booster blade 111 towards the outer blade 21, reducing airflow resistance, thereby improving the airflow guiding effect and reducing the operating noise of the impeller assembly 100.

[0083] In one embodiment, the fan further includes a fixed base 3, which includes a fixed disc portion 31 and a fixed sleeve portion 32. The fixed sleeve portion 32 is sleeved on the motor shaft 302, and the fixed disc portion 31 is detachably connected to the intermediate disk 1. This enhances the connection stability and convenience between the motor shaft 302 and the intermediate disk 1, and ensures the operational reliability and stability of the impeller assembly 100.

[0084] The fixed plate portion 31 is attached to the side of the central plate portion 121 facing the air inlet, thereby reducing interference between the fixed plate portion 31 and the motor housing 301 of the drive motor 300 and improving the assembly convenience of the fixed plate portion 31. The fixed plate portion 31 is spaced apart from the pressure plate 11 to reduce assembly interference between the two.

[0085] In one embodiment, the central disc portion 121 is recessed in a direction away from the air inlet end to form a central recess 1211, the fixing disc portion 31 is fitted to the central recess 1211, and the fixing ring portion 113 is located on the outside of the central recess 1211. The central recess 1211 can reduce the height difference between the surfaces of the fixing disc portion 31 and the fixing ring portion 113 while ensuring that the thickness of the fixing disc portion 31 meets the installation requirements, thereby reducing the impact of the fixing disc portion 31 on the airflow diversion effect of the booster plate 11; at the same time, the central recess 1211 can enhance the structural strength and rigidity of the mounting disc 12 at the center, reduce the probability of deformation of the mounting disc 12, and improve the structural stability and reliability of the mounting disc 12.

[0086] Furthermore, the end of the motor shaft 302 away from the motor housing 301 has a screw section, and a locking nut 500 is screwed onto the screw section. The locking nut 500 presses against the fixed sleeve 32, so that the fixed sleeve 32 is clamped between the locking nut 500 and the middle plate 1, thereby ensuring the axial stability of the middle plate 1, the motor shaft 302 and the fixed seat 3.

[0087] The end of the fixed sleeve 32 away from the air inlet passes through the mounting through hole into the middle plate 1, and a limiting groove is formed on the end face. The limiting groove extends radially along the motor shaft 302. A limiting rod 600 is connected to the motor shaft 302. The limiting rod 600 extends radially along the motor shaft 302 and is accommodated in the limiting groove to limit the motor shaft 302 and the fixed sleeve 32 in the circumferential direction of the motor shaft 302, preventing relative rotation between the motor shaft 302 and the fixed seat 3. At the same time, this arrangement allows the fixed seat 3 to be clamped between the limiting rod 600 and the locking nut 500. During disassembly, only the locking nut 500 needs to be loosened to remove the drive motor 300, effectively improving the convenience and efficiency of disassembly and assembly of the drive motor 300.

[0088] This embodiment also provides a fume extraction device, including the aforementioned fan. By using the aforementioned fan, the fume extraction capacity can be significantly improved, thereby enhancing the performance of the fume extraction device.

[0089] Example 2

[0090] like Figure 9 As shown, this embodiment provides a design method for the middle disk 1 to perform structural design of the booster blades 111 of the middle disk 1.

[0091] Specifically, the design method for the middle plate 1 provided in this embodiment includes the following steps:

[0092] Step S1: Based on the rated operating conditions of the fan, determine the radius R1 of the first base circle 101, the radius R2 of the second base circle 102, the inlet installation angle β1, and the outlet installation angle β2 of the booster blade 111;

[0093] Step S2: Arbitrarily determine point B on the first base circle 101 as the first end 1111 of the booster blade 111;

[0094] Step S3: Set the center of the first base circle 101 to O, the center of the booster blade 111 to M, and the second end 1112 of the booster blade 111 to point C. Based on the fact that triangles OMC and OMB share a common side OM, ... and Calculate the lengths of MC and OM respectively;

[0095] Step S4: Draw the first auxiliary circle with point O as the center and OM as the radius, and draw the second auxiliary circle with point B as the center and MC as the radius. The intersection of the first auxiliary circle and the second auxiliary circle is point M.

[0096] Step S5: Draw a third auxiliary circle with point M as the center and MC as the radius, and obtain the intersection point C of the third auxiliary circle and the second base circle 102, which is the second end 1112 of the booster blade 111.

[0097] Step S6: Determine the number N of the booster blades 111, and arrange the BC curves in a circumferential array around point O;

[0098] Step S7: Model and simulate the wind turbine based on the designed middle plate 1.

[0099] Simulation results show that conventional fans without booster blades (such as...) Figure 11 The airflow velocity at the center of the impeller assembly 100 is slow, while the fan with pressurizing blades 111 (such as...) Figure 10 The airflow velocity at the outer blade 21 increases significantly, indicating that the airflow through the outer blade 21 increases. The airflow at the center of the impeller assembly 100 can effectively flow to the outer blade 21 under the rotation of the pressurizing blade 111, thereby effectively enhancing the fan's airflow extraction effect.

[0100] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0101] The specific embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An impeller assembly comprising an annular impeller body (2), characterized in that, The impeller body (2) is coaxially provided with a middle disk (1), and the middle disk (1) has a conical ring (112) coaxial with the impeller body (2). The small end of the conical ring (112) faces the air inlet end of the impeller body (2), and the large end of the conical ring (112) is spaced apart from the inner ring of the impeller body (2). The outer peripheral wall of the conical ring portion (112) is provided with a plurality of booster blades (111) at intervals around the rotation axis of the impeller assembly. The booster blades (111) extend in an arc shape along the circumference of the conical ring portion (112) from the first end (1111) to the second end (1112). The first end (1111) of the booster blade (111) is close to the small end of the conical ring portion (112) and the second end (1112) is close to the large end of the conical ring portion (112). The extension direction of the booster blades (111) from the first end (1111) to the second end (1112) is opposite to the rotation direction of the impeller assembly. The height of the booster blade (111) protruding from the conical ring (112) gradually increases from the first end (1111) to the second end (1112).

2. The impeller assembly according to claim 1, characterized in that, The height of the first end (1111) of the pressurizing blade (111) is W1, where 0 < W1 ≤ 2 mm; And / or, the height of the second end (1112) of the booster blade (111) is W2, 8mm≤W2≤12mm.

3. The impeller assembly according to claim 1, characterized in that, Along the axial direction of the impeller assembly, the distance between the booster blade (111) and the plane where the air inlet end of the impeller body (2) is located gradually increases from the first end (1111) to the second end (1112).

4. The impeller assembly according to claim 3, characterized in that, Along the axial direction of the impeller assembly, the height of the impeller body (2) is H, the distance between the first end (1111) of the booster blade (111) and the plane where the air inlet is located is d1, and the distance between the second end (1112) of the booster blade (111) and the plane where the air inlet is located is d2. 0.3≤d1 / H≤0.5, and / or, d2-d1=5mm~20mm.

5. The impeller assembly according to claim 1, characterized in that, The end edge (1114) of the second end (1112) of the booster blade (111) is inclined relative to the rotation axis, and one end of the end edge (1114) connected to the conical ring (112) is close to the rotation axis relative to the other opposite end; And / or, the booster blade (111) has a windward side (1113) disposed opposite to the conical ring portion (112), the windward side (1113) extending from the first end (1111) to the second end (1112), and the windward side (1113) and the end edge (1114) of the second end (1112) are connected by a smooth arc transition.

6. The impeller assembly according to claim 1, characterized in that, The first end (1111) of all the booster blades (111) is located on the first base circle (101), and the second end (1112) of all the booster blades (111) is located on the second base circle (102). The first base circle (101) and the second base circle (102) are coaxially arranged with the impeller body (2). The radius of the inner circle of the impeller body (2) is R0. The radius of the first base circle (101) is R1, 0.4≤R1 / R0≤0.6; and / or, the radius of the second base circle (102) is R2, 0.75≤R2 / R0≤0.

88.

7. The impeller assembly according to any one of claims 1-6, characterized in that, The middle plate (1) includes a mounting plate (12) and a booster plate (11) arranged coaxially. The mounting plate (12) is inserted into all the outer blades (21) of the impeller body (2). The booster plate (11) is arranged in a ring and is detachably installed on the side of the mounting plate (12) facing the air inlet. The booster plate (11) has the booster blade (111) and the conical ring portion (112).

8. The impeller assembly according to claim 7, characterized in that, The mounting plate (12) includes a central plate portion (121), a frustum portion (122), and an outer ring portion (123) that are coaxially connected from the inside to the outside. The outer ring portion (123) and the central plate portion (121) are both perpendicular to the rotation axis of the impeller assembly. The frustum portion (112) is fitted and sleeved on the outside of the frustum portion (122). The outer blade (21) passes through the outer ring portion (123). The small end of the conical ring portion (112) is connected to a fixed ring portion (113), the fixed ring portion (113) is fitted to the central disk portion (121) and is detachably connected to the central disk portion (121); and / or, the large end of the conical ring portion (112) extends outward to a transition ring portion (114), the transition ring portion (114) is smoothly connected to the conical ring portion (112), and the transition ring portion (114) is fitted to the outer ring portion (123).

9. A fan, comprising a volute (200) and a drive motor (300) mounted on the volute (200), characterized in that, It also includes an impeller assembly as described in any one of claims 1-8, the impeller assembly being installed inside the volute (200), and the motor shaft (302) of the drive motor (300) being connected to the central disk (1).

10. A fume extraction device, characterized in that, Including the wind turbine as described in claim 9.

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