Diagonal flow impeller, fan and ventilation equipment

Abstract

The invention discloses an oblique flow impeller, a fan and ventilation equipment, the oblique flow impeller comprises a bottom plate, a top plate and a plurality of blades, and the bottom plate is used for being connected with a driving motor; the top plate is provided with an air inlet; an air inlet is formed in the top plate, the multiple blades are connected between the bottom plate and the top plate and arranged around the axis of the air inlet, an air outlet is formed between the bottom plate and the top plate, in the axial direction of the air inlet, the diameters of circumferences defined by the blades are different, and the outer diameter of the bottom plate is smaller than that of the top plate. According to the technical scheme, efficiency can be improved, and noise is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation equipment, and in particular to an oblique flow impeller, a fan and ventilation equipment. Background Art

[0002] At present, most light commercial or commercial air conditioner cabinet fans use a forward multi-blade centrifugal impeller plus a volute fan solution. This solution has the advantages of large air volume and low noise, but due to the flow characteristics of the forward multi-blade impeller, the efficiency is low and difficult to improve;

[0003] If the existing mature backward centrifugal / mixed flow or axial flow fan is used, its efficiency is better than that of the fan with forward multi-blade centrifugal impeller. However, since the pressure rise capacity of these two types of fans is smaller than that of the forward multi-blade impeller fan, the fan will be larger or the speed will be higher, resulting in a higher noise risk. Therefore, while the efficiency is improved, it will also bring risks such as assembly and noise. Summary of the invention

[0004] The main purpose of the present invention is to provide a diagonal flow impeller, aiming to improve efficiency and reduce noise.

[0005] To achieve the above object, the oblique flow impeller proposed in the present invention comprises:

[0006] A bottom plate, used for connecting with a driving motor;

[0007] a top plate having an air inlet; and

[0008] A plurality of blades are connected between the bottom plate and the top plate and are arranged around the axis of the air inlet, and an air outlet is formed between the bottom plate and the top plate. In the axial direction of the air inlet, the diameters of the circles enclosed by the blades are different, and the outer diameter of the bottom plate is smaller than the outer diameter of the top plate.

[0009] Optionally, an outer diameter D1 of the top plate and an outer diameter D2 of the bottom plate satisfy: 0.7≤D2 / D1<1.

[0010] Optionally, the surface where the bottom plate is connected to the blade is an inclined surface, and its inclination angle γ satisfies: 10°<γ<40°.

[0011] Optionally, the surface of the top plate connected to the blade is an inclined surface, and its inclination angle δ satisfies: 10°<δ<50°.

[0012] Optionally, in the radial direction of the air inlet, the dimension between the projection line of the blade on the axial section of the air inlet and the axis of the air inlet gradually decreases from the top plate to the bottom plate.

[0013] Optionally, the blade has a top edge connected to the top plate, and a bottom edge connected to the bottom plate, and a maximum diameter D3 of a top circle formed by the top edges and an outer diameter D1 of the top plate satisfy: D1 ≥ D3.

[0014] Optionally, a maximum diameter D4 of a bottom circle formed by the bottom edges and an outer diameter D2 of the bottom plate satisfy: D4 ≥ D2.

[0015] Optionally, the blade has a leading edge and a trailing edge connected between the top edge and the bottom edge, and the trailing edge is located outside the leading edge and is inclined toward the leading edge.

[0016] Optionally, the trailing edge is inclined relative to the axis of the air inlet, and the inclination angle between the trailing edge and the axis of the air inlet is α, 0°≤α≤45°.

[0017] Optionally, the trailing edge includes an inclined segment and an arc segment, the arc segment protrudes in a direction away from the leading edge, one end of the arc segment is connected to the inclined segment, and the other end is connected to the bottom edge.

[0018] Optionally, the trailing edge comprises an inclined section and a toothed structure, wherein the toothed structure is formed on the inclined section.

[0019] The present invention also provides a fan, which includes the diagonal flow impeller as described above.

[0020] The present invention also provides a ventilation device, which comprises the fan as described above.

[0021] In the technical solution of the present invention, in the axial direction of the air inlet, the diameters of the circles enclosed by the blades are designed to be unequal, and the outer diameter of the bottom plate is set to be smaller than the outer diameter of the top plate. When the diagonal flow impeller is applied to the fan, the load of the diagonal flow impeller can be maximized within the size limit of the fan casing, and the speed can be reduced as much as possible while meeting the pressure rise requirement, thereby effectively improving noise and airflow loss under the action of the diagonal flow impeller, thereby improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0023] Figure 1 A cross-sectional view of an embodiment of a diagonal flow impeller of the present invention;

[0024] Figure 2It is a structural schematic diagram of an embodiment of a diagonal flow impeller;

[0025] Figure 3 is a structural schematic diagram of another embodiment of a diagonal flow impeller;

[0026] Figure 4 It is a schematic diagram of the dimensions of each structure on the diagonal flow impeller;

[0027] Figure 5 for Figure 2 Schematic diagram of the structure of the mid-tail edge;

[0028] Figure 6 for Figure 3 Schematic diagram of the structure of the mid-tail edge;

[0029] Figure 7 This is a comparison chart of the required speeds of the diagonal flow impeller and the equal-diameter impeller at the same efficiency and air volume;

[0030] Figure 8 This is a comparison chart of the efficiency of a fan using a diagonal flow impeller and a fan using a traditional impeller.

[0031] Description of Figure Numbers:

[0032] Label name Label name 10 Base Plate 33 Trailing edge 20 roof 331 Inclined section 21 Air Inlet 332 Arc 30 blade 34 Air outlet 31 Bottom 40 Motor 32 Leading edge

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions, taking "A and / or B as an example", including solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The invention provides an oblique flow impeller.

[0039] Reference Figures 1 to 8 In an embodiment of the present invention, the diagonal flow impeller includes a bottom plate 10, a top plate 20 and a plurality of blades 30, the bottom plate 10 is used to be connected to a driving motor 40; the top plate 20 is provided with an air inlet 21; the plurality of blades 30 are connected between the bottom plate 10 and the top plate 20, and are arranged around the axis of the air inlet 21, and an air outlet 34 is formed between the bottom plate 10 and the top plate 20, in the axial direction of the air inlet 21, the diameters of the circumferences formed by the blades 30 are different, and the outer diameter of the bottom plate 10 is smaller than the outer diameter of the top plate 20, so that when the diagonal flow impeller is applied to the fan, under the size limit of the fan casing, the load of the diagonal flow impeller can be maximized, and then the speed can be reduced as much as possible while meeting the pressure rise requirement, thereby improving the noise and the loss of airflow under the action of the diagonal flow impeller, and improving the efficiency.

[0040] The performance of the oblique flow impeller is mainly reflected in the air volume and noise control. The air volume and noise level are mutually dependent. Generally, the larger the air volume, the higher the noise level, and the smaller the air volume, the lower the noise level. The air volume is proportional to the rotation speed.

[0041] In the present application, the bottom plate 10 is concentrically connected to the top plate 20, and the bottom plate 10 is provided with a fixed mounting position for the power supply motor 40, wherein the rotating shaft on the motor 40 is fixedly connected to the bottom plate 10. When in use, the impeller is driven to rotate by the rotating shaft. Since a plurality of blades 30 are arranged between the bottom plate 10 and the top plate 20, and each blade 30 is arranged at intervals along the axis of the air inlet 21 of the top plate 20, an air outlet 34 is formed between two adjacent blades 30, so that the airflow flows into the impeller from the air inlet 21, and flows out from the air outlet 34 in the radial direction of the impeller under the rotation of the impeller and the action of the blades 30, and the pressure of the airflow is increased at this time.

[0042] When the diagonal flow impeller is used in a fan, the airflow will be transformed from radial flow to flow along the impeller axis through cooperation with the shell. Since in the axial direction of the air inlet 21, the diameters of the circles enclosed by the blades 30 are not equal, that is, based on the specific structure of the blades 30, the diameters of the circles can be gradually reduced in the direction from the top plate 20 to the bottom plate 10, or the diameters of the circles can be increased first and then decreased, or the diameters of the circles can be decreased first and then increased. At this time, the impeller formed by the connection between the bottom plate 10 and the top plate 20 is a non-uniform diameter impeller. Such a setting can effectively reduce the rotation speed, improve noise, and effectively reduce the loss during turning, thereby improving efficiency.

[0043] The outer diameter of the bottom plate 10 is smaller than the outer diameter of the top plate 20. Since the top plate 20 can guide the airflow to the blades 30, the bottom plate 10 can make the airflow flow to the air outlet 34 along a certain angle and flow out from the air outlet 34. The setting of this angle not only assists the flow of the airflow, but also facilitates the change of the flow direction when matched with the shell. At the same time, the outer diameter of the top plate 20 is limited to be larger than the outer diameter of the bottom plate 10, which facilitates the formation of a bladeless expansion zone between the top plate 20 and the wall of the shell, reduces the ineffective work of the airflow passing through the impeller, further improves the static pressure efficiency, and improves the noise.

[0044] In the technical solution of the present invention, in the axial direction of the air inlet 21, the diameters of the circles enclosed by the blades 30 are designed to be unequal, and the outer diameter of the bottom plate 10 is set to be smaller than the outer diameter of the top plate 20. When the diagonal flow impeller is applied to the fan, the load of the diagonal flow impeller can be maximized within the size limit of the fan casing, and the speed can be reduced as much as possible while meeting the pressure rise requirement, thereby effectively improving noise and airflow loss under the action of the diagonal flow impeller, thereby improving efficiency.

[0045] Reference Figure 4In one embodiment, the outer diameter D1 of the top plate 20 and the outer diameter D2 of the bottom plate 10 satisfy: 0.7≤D2 / D1<1, ensuring that the outer diameter of the top plate 20 is larger than the outer diameter of the bottom plate 10, and reducing the loss of airflow passing through the impeller to improve efficiency. Specifically, when D2 / D1 is less than 0.7, taking the outer diameter of the top plate 20 as a constant value as an example, the outer diameter of the bottom plate 10 is too small, resulting in the airflow not passing through the impeller to do work, or only a small part of the airflow does work under the action of the impeller, which leads to a large leakage loss of the airflow and reduces efficiency. When D2 / D1 is greater than 1, taking the outer diameter of the top plate 20 as a constant value as an example, the outer diameter of the bottom plate 10 is too large, resulting in the outer diameter of the top plate 20 being smaller than the outer diameter of the bottom plate 10, which easily leads to an increase in invalid work, and the turning loss of the airflow from radial flow to axial flow is large, thereby reducing efficiency and increasing noise.

[0046] Therefore, by limiting the ratio between the outer diameter of the top plate 20 and the outer diameter of the bottom plate 10 to between 0.7 and 1, it is possible to ensure that the outer diameter of the top plate 20 is larger than the outer diameter of the bottom plate 10, which is conducive to the formation of the pressure diffusion zone, and it is also convenient to reduce losses and increase air volume, so as to improve efficiency and reduce noise. Specifically, the specific ratio between the outer diameter of the top plate 20 and the outer diameter of the bottom plate 10 can be 0.7, 0.75, 0.8, 0.85, and 0.9.

[0047] Reference Figure 4 In one embodiment, the surface of the bottom plate 10 connected to the blade 30 is an inclined surface, and its inclination angle γ satisfies: 10°<γ<40°. Through the inclination setting of the bottom plate 10, an inclination angle γ is formed between the inclined surface of the bottom plate 10 and the radial direction of the impeller, so that after the impeller does work, the airflow flows out in a direction with a certain angle to the radial direction of the impeller. Then, in cooperation with the shell, during the turning process of the airflow from radial flow to axial flow, the turning angle of the airflow flow direction is less than 90°, which effectively ensures the reliable flow of the airflow and improves the pressure rise capacity. At the same time, it can assist the change of the flow direction of the airflow, reduce the turning loss, and reduce the impact on the efficiency. Specifically, when γ<10°, due to the small inclination angle of the bottom plate 10, the effect of assisting the turning is not obvious, and the turning loss cannot be effectively improved, which is easy to affect the improvement of efficiency; when γ≥40°, due to the large inclination angle of the bottom plate 10, it effectively assists the change of the airflow direction, thereby improving the efficiency, but it is also easy to affect the pressure rise capacity of the fan, and thus it is easy to increase the noise risk.

[0048] Therefore, by limiting the size of the inclination angle γ to between 10° and 40°, the fan can be ensured to have a good pressure rise capability while reducing losses and improving efficiency. Specifically, the specific value of the inclination angle γ can be 15°, 20°, 25°, 30°, 35°, etc.

[0049] Reference Figure 4 In one embodiment, the surface of the top plate 20 connected to the blade 30 is an inclined surface, and its inclination angle δ satisfies: 10°<δ<50°. The airflow flows into the impeller from the air inlet 21 of the top plate 20. The inclined setting of the top plate 20 effectively guides the airflow to the area between the top plate 20 and the bottom plate 10, thereby accelerating the airflow to the blade 30. Under the guiding effect of the blade 30 and the bottom plate 10, the airflow flows out of the impeller through the air outlet 34 at a certain angle, effectively improving the pressure rise capacity and improving the efficiency. Specifically, when δ is less than 10°, due to the small inclination angle of the top plate 20, the effect of guiding the airflow to the blades 30 and the bottom plate 10 is not obvious, and it is easy for the airflow to flow out from the air outlet 34 and then re-enter the impeller from the air inlet 21 to form a cycle, thereby affecting the improvement of the pressure lift capacity; when δ is ≥50°, due to the large inclination angle of the top plate 20, the air outlet 34 is reduced, and it is easy to cause the outer diameter of the top plate 20 to be smaller than the outer diameter of the bottom plate 10, as well as an increase in cost and a decrease in air output.

[0050] Therefore, by limiting the size of the inclination angle δ to between 10° and 50°, the fan can have a good pressure rise capability and reduce noise while ensuring efficiency and air volume. Specifically, the specific value of the inclination angle δ can be 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0051] Reference Figures 1 to 6 In one embodiment, in the radial direction of the air inlet 21, the dimension between the projection line of the blade 30 on the axial section of the air inlet 21 and the axis of the air inlet 21 gradually decreases along the direction from the top plate 20 to the bottom plate 10, that is, along the direction from the top plate 20 to the bottom plate 10, the projection line gradually approaches the axis of the air inlet 21, or, the diameter of the circle enclosed by each blade 30 gradually decreases. At this time, the impeller formed by the connection between the bottom plate 10 and the top plate 20 is a non-uniform impeller, and the limitations such as D2 is less than D1, 0.7≤D2 / D1<1, etc. are conducive to further reliably reducing the rotation speed, improving noise, reducing losses during turning, and improving efficiency.

[0052] Reference Figure 4In one embodiment, the blade 30 has a top edge connected to the top plate 20, and a bottom edge 31 connected to the bottom plate 10. The maximum diameter D3 of the top circle formed by the top edges and the outer diameter D1 of the top plate 20 satisfy: D1≥D3. Furthermore, the outer diameter of the top plate 20 is larger than the outer diameter of the bottom plate 10. Under the condition that a movement gap is left between the impeller and the shell and the rotation of the impeller is not affected, the outer diameter of the top plate 20 can be as large as possible. At this time, a bladeless expansion zone is formed between the top plate 20 and the wall of the shell, which is conducive to forming a secondary seal between the top plate 20 and the shell, reducing the airflow flowing out of the air outlet 34 from re-entering the impeller to do work, and promoting the airflow to flow out in a direction with a certain angle to the radial direction of the impeller under the guidance of the blades 30 and the bottom plate 10. Furthermore, under the cooperation with the shell, the airflow is transformed from radial flow to axial flow, further improving the static pressure efficiency and improving the noise.

[0053] Reference Figures 4 to 5 In one embodiment, the maximum diameter D4 of the bottom circle formed by the bottom edges 31 and the outer diameter D2 of the bottom plate 10 satisfy: D4≥D2, and the diameter of the circumference formed by the blades 30 gradually decreases, that is, D3>D4, further limiting the outer diameter of the bottom plate 10 to ensure reliable turning of the airflow direction. When D4>D2, at least part of the blades 30 extend out of the bottom plate 10 to further improve the direction of the airflow flowing along the blades 30 and ensure that the airflow is not blocked by the bottom plate 10, which is beneficial to reduce the loss of the airflow when turning and improve efficiency.

[0054] In combination with the designs of D1≥D3, D4≥D2 and 0.7≤D2 / D1<1, and the gradually decreasing diameter of each circle formed by each blade 30 in the axial direction of the air inlet, the diagonal flow impeller is configured as a non-uniform diameter impeller, such as Figure 7 As shown in the figure, under the same air volume and efficiency conditions, the speed required by the non-equal diameter impeller is significantly lower than that required by the equal diameter impeller. Therefore, the fan with non-equal diameter impeller can effectively increase the load and significantly reduce the speed while ensuring efficiency and air volume. For specific speed value comparison, please refer to the table below.

[0055]

[0056] Reference Figures 2 to 3 In one embodiment, the blade 30 has a leading edge 32 and a trailing edge 33 connected between the top edge and the bottom edge 31, and the trailing edge 33 is located on the outer side of the leading edge 32 and is inclined toward the leading edge 32, wherein the trailing edge 33 can be inclined as a whole or partially, so that the phase difference of the airflow at the air outlet 34 can be changed, effectively weakening the superposition of noise energy and reducing noise.

[0057] Reference Figures 5 to 6 In one embodiment, the trailing edge 33 is inclined relative to the axis of the air inlet 21, and the inclination angle between the trailing edge 33 and the axis of the air inlet 21 is α, 0°≤α≤45°, so that the air volume in the axial direction of the impeller can be obviously linearly changed, thereby improving the noise. Specifically, one end of the trailing edge 33 is connected to the top plate 20, and the other end is gradually inclined toward the bottom plate 10, and the inclination direction thereof forms an inclination angle α with the axial direction of the air inlet 21, and the specific value of the inclination angle can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0058] Further, in one embodiment, the trailing edge 33 includes an inclined section 331 and an arc section 332, the arc section 332 protrudes in a direction away from the leading edge 32, and one end of the arc section 332 is connected to the inclined section 331, and the other end is connected to the bottom edge 31. Figure 6 As shown, the inclination angle of the inclined section 331 is α, and the arc section 332 is connected between the inclined section 331 and the bottom edge 31, and both have a smooth transition with the inclined section 331 and the bottom plate 10. Compared with the overall inclined setting of the trailing edge 33, the setting of the arc section 332 can effectively improve the structural rigidity of the blade 30 and also facilitate the reduction of turbulence caused by structural mutations.

[0059] In another embodiment, the trailing edge 33 includes an inclined section 331 and a tooth-like structure, and the tooth-like structure is formed on the inclined section 331 . Such a configuration effectively improves the structural rigidity of the blade 30 .

[0060] It is worth mentioning that, through the design of the structural parameters such as the shape and size of the above structure, the performance of the diagonal flow impeller of the present application is better than that of the equal-diameter impeller when used on the fan. Figure 8 As shown in the table below, the efficiency of the fan with non-uniform impellers in this solution is significantly higher than that of the fan in the traditional solution. For specific efficiency comparison, please refer to Figure 8 And the table below.

[0061]

[0062]

[0063] The present invention also proposes a fan, which includes an oblique flow impeller. The specific structure of the oblique flow impeller refers to the above-mentioned embodiment. Since the fan adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0064] The present invention further provides a ventilation device, which includes a fan. The specific structure of the fan is referred to the above embodiment. Since the ventilation device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. The ventilation device can be a heat pump, an air conditioner, etc.

[0065] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A diagonal flow impeller, characterized in that: include: A bottom plate, used for connecting with a driving motor; A top plate, provided with an air inlet; as well as A plurality of blades are connected between the bottom plate and the top plate and are arranged around the axis of the air inlet, and an air outlet is formed between the bottom plate and the top plate. In the axial direction of the air inlet, the diameters of the circles enclosed by the blades are different, and the outer diameter of the bottom plate is smaller than the outer diameter of the top plate.

2. The oblique flow impeller according to claim 1, characterized in that: The outer diameter D1 of the top plate and the outer diameter D2 of the bottom plate satisfy: 0.7≤D2 / D1<1.

3. The oblique flow impeller according to claim 1, characterized in that: The surface where the bottom plate is connected to the blades is an inclined surface, and its inclination angle γ satisfies: 10°<γ<40°.

4. The oblique flow impeller according to claim 1, characterized in that: The surface where the top plate is connected to the blades is an inclined surface, and its inclination angle δ satisfies: 10°<δ<50°.

5. The oblique flow impeller according to claim 1, characterized in that: In the radial direction of the air inlet, the dimension between the projection line of the blade on the axial section of the air inlet and the axis of the air inlet gradually decreases from the top plate to the bottom plate.

6. The diagonal flow impeller according to claim 5, characterized in that: The blade has a top edge connected to the top plate, and a bottom edge connected to the bottom plate, and a maximum diameter D3 of a top circle formed by the top edges and an outer diameter D1 of the top plate satisfy: D1≥D3.

7. The oblique flow impeller according to claim 6, characterized in that: The maximum diameter D4 of the bottom circle formed by the bottom edges and the outer diameter D2 of the bottom plate satisfy: D4≥D2.

8. The oblique flow impeller according to claim 6, characterized in that: The blade has a leading edge and a trailing edge connected between the top edge and the bottom edge. The trailing edge is located outside the leading edge and is inclined toward the leading edge.

9. The diagonal flow impeller according to claim 8, characterized in that: The trailing edge is inclined relative to the axis of the air inlet, and the inclination angle between the trailing edge and the axis of the air inlet is α, 0°≤α≤45°.

10. The oblique flow impeller according to claim 8, characterized in that: The trailing edge includes an inclined section and an arc section. The arc section protrudes in a direction away from the leading edge, and one end of the arc section is connected to the inclined section, and the other end is connected to the bottom edge.

11. The oblique flow impeller according to claim 8, characterized in that: The trailing edge includes an inclined section and a toothed structure, wherein the toothed structure is formed on the inclined section.

12. A fan, characterized in that: It comprises the inclined flow impeller as claimed in any one of claims 1 to 11.

13. A ventilation device, characterized in that: Comprising the fan as claimed in claim 12.

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