Diagonal impeller, fan and ventilation device

Abstract

Provided are a diagonal impeller, a fan and a ventilation device. The diagonal impeller comprises a bottom plate (10), a top plate (20) and a plurality of blades (30). The bottom plate (10) is configured 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 air outlets (34) are formed between the bottom plate (10) and the top plate (20); the diameters of circles defined by the blades (30) are unequal in the axial direction of the air inlet (21), and the outer diameter of the bottom plate (10) is less than the outer diameter of the top plate (20).

Description

Diagonal flow impellers, fans and ventilation equipment

[0001] This application claims priority to Chinese patent application No. 202310960097.X filed on August 1, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of ventilation equipment, and in particular to an oblique flow impeller, a fan and ventilation equipment. Background Art

[0003] Currently, most light commercial or commercial air conditioner cabinet fans use a forward-facing 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.

[0004] If the existing mature backward centrifugal / mixed flow or axial flow fans are used, their efficiency is better than that of fans with forward multi-blade centrifugal impellers. However, since the pressure rise capacity of these two types of fans is smaller than that of forward multi-blade impeller fans, the fan size will be larger or the speed will be increased, resulting in a higher noise risk. Therefore, while the efficiency is improved, it will also bring risks such as assembly and noise. Technical issues

[0005] The main purpose of this application is to provide a diagonal flow impeller to improve efficiency and reduce noise. Technical Solutions

[0006] To achieve the above objectives, the inclined flow impeller proposed in this application includes:

[0007] A bottom plate, used for connecting with the drive motor;

[0008] a top plate having an air inlet; and

[0009] A plurality of blades are connected between the bottom plate and the top plate and 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.

[0010] In one embodiment, the outer diameter D1 of the top plate and the outer diameter D2 of the bottom plate satisfy: 0.7≤D2 / D1<1.

[0011] In one embodiment, the surface where the bottom plate is connected to the blade is an inclined surface, and the inclination angle γ thereof satisfies: 10°<γ<40°.

[0012] In one embodiment, the surface where the top plate is connected to the blades is an inclined surface, and the inclination angle δ thereof satisfies: 10°<δ<50°.

[0013] 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.

[0014] In one embodiment, the blade has a top edge connected to the top plate and a bottom edge connected to the bottom plate, and the maximum diameter D3 of the top circle enclosed by the top edges and the outer diameter D1 of the top plate satisfy: D1 ≥ D3.

[0015] In one embodiment, 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.

[0016] In one embodiment, 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.

[0017] In one embodiment, 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°.

[0018] In one embodiment, the trailing edge includes an inclined section and an arc section, the arc section protrudes in a direction away from the leading edge, and has one end connected to the inclined section and the other end connected to the bottom edge.

[0019] In one embodiment, the trailing edge includes an inclined section and a tooth-like structure, wherein the tooth-like structure is formed on the inclined section.

[0020] The present application also provides a fan, which includes the oblique flow impeller as described above.

[0021] The present application also provides a ventilation device, which includes the fan as described above. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] FIG1 is a cross-sectional view of an embodiment of an oblique flow impeller of the present application;

[0024] FIG2 is a schematic structural diagram of an embodiment of a diagonal flow impeller;

[0025] FIG3 is a schematic structural diagram of another embodiment of an oblique flow impeller;

[0026] Figure 4 is a schematic diagram of the dimensions of various structures on the diagonal flow impeller;

[0027] FIG5 is a schematic structural diagram of the trailing edge in FIG2 ;

[0028] FIG6 is a schematic structural diagram of the trailing edge in FIG3 ;

[0029] Figure 7 is a comparison of the required speeds for an oblique flow impeller and a constant diameter impeller at the same efficiency and air volume;

[0030] FIG8 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] Reference number name Reference number name 10 bottom plate 33 trailing edge 20 top plate 331 inclined section 21 air inlet 332 arc section 30 blade 34 air outlet 31 bottom edge 40 motor 32 leading edge

[0033] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

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

[0035] In this application, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0036] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various 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 application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel solutions. Taking "A and / or B as an example", it includes Solution A, or Solution B, or a solution in which both A and B are satisfied. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually 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 this application.

[0038] The present application proposes an oblique flow impeller.

[0039] 1 to 8 , in the embodiment of the present application, 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 connect to a drive 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. 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 circles enclosed 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. When the diagonal flow impeller is applied to a 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 improving noise and air flow loss under the action of the diagonal flow impeller, thereby improving 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 provided 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 air flow flows into the impeller from the air inlet 21, and under the action of the rotation of the impeller and the action of the blades 30, it flows out from the air outlet 34 in the radial direction of the impeller, and the pressure of the air flow 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 the diameters of the circles formed by the blades 30 are not equal in the axial direction of the air inlet 21, 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 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 that 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 cooperating 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 when the airflow passes through the impeller, further improves the static pressure efficiency, and improves the noise.

[0044] In the technical solution of the present application, 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, effectively improving noise and air flow loss under the action of the diagonal flow impeller, thereby improving efficiency.

[0045] 4 , in one embodiment, the outer diameter D1 of the top plate 20 and the outer diameter D2 of the bottom plate 10 satisfy the relationship: 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 perform work, or only a small portion of the airflow performing work under the action of the impeller, thereby resulting in large leakage loss of the airflow and reduced 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. In addition, the turning loss when the airflow changes from radial flow to axial flow is large, thereby reducing efficiency and increasing noise.

[0046] Therefore, by limiting the ratio of the outer diameter of the top plate 20 to the outer diameter of the bottom plate 10 to between 0.7 and 1, the outer diameter of the top plate 20 is ensured to be larger than that of the bottom plate 10, thereby facilitating the formation of a pressure diffusion zone. This also helps reduce losses and increase air volume, thereby improving efficiency and reducing noise. Specifically, the ratio of the outer diameter of the top plate 20 to the outer diameter of the bottom plate 10 can be 0.7, 0.75, 0.8, 0.85, or 0.9.

[0047] Referring to FIG4 , in one embodiment, the surface of the base plate 10 connecting to the blades 30 is an inclined surface, and its inclination angle γ satisfies the following: 10° < γ < 40°. By tilting the base plate 10, an inclination angle γ is formed between the inclined surface of the base plate 10 and the radial direction of the impeller. This causes the airflow, after the impeller performs work, to flow out in a direction that is angled relative to the radial direction of the impeller. Furthermore, in conjunction with the housing, the airflow turns from radial to axial flow at a turning angle of less than 90°, effectively ensuring reliable airflow and improving pressure lift capability. Furthermore, the turning angle can assist in changing the airflow direction, reducing turning losses and minimizing the impact on efficiency. Specifically, when γ is less than 10°, the inclination angle of the base plate 10 is relatively small, resulting in a less pronounced turning assistance effect, which fails to effectively improve turning losses and thus may affect efficiency. When γ is greater than or equal to 40°, the inclination angle of the base plate 10 is relatively large, effectively assisting in changing the airflow direction and thus improving efficiency. However, this can also affect the pressure lift capability of the fan and increase noise risk.

[0048] Therefore, by limiting the tilt angle γ to between 10° and 40°, the fan can reduce losses, improve efficiency, and ensure good pressure rise capability. Specifically, the tilt angle γ can be 15°, 20°, 25°, 30°, 35°, etc.

[0049] 4 , in one embodiment, the surface connecting the top plate 20 and the blades 30 is an inclined surface, and the inclination angle δ thereof 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 blades 30. Under the guiding action of the blades 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 capability 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 the airflow is likely to flow out of the air outlet 34 and then re-enter the impeller through the air inlet 21 to form a cycle, thereby affecting the improvement of the pressure lift capacity; when δ is greater than or equal to 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 tilt 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 tilt angle δ can be 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0051] 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 being less than D1 and 0.7≤D2 / D1<1 are conducive to further reliably reducing the rotation speed, improving noise, reducing losses during turning, and improving efficiency.

[0052] 4 , in 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 enclosed by the top edges and the outer diameter D1 of the top plate 20 satisfy the following relationship: D1 ≥ D3. Furthermore, the outer diameter of the top plate 20 is larger than the outer diameter of the bottom plate 10 . While ensuring a movement gap between the impeller and the housing and not affecting the rotation of the impeller, the outer diameter of the top plate 20 can be as large as possible. At this time, a bladeless diffusion zone is formed between the top plate 20 and the wall of the housing, which is conducive to forming a secondary seal between the top plate 20 and the housing, reducing the airflow flowing out of the air outlet 34 from re-entering the impeller to perform work, and promoting the airflow to flow out in a direction having a certain angle with the radial direction of the impeller under the guidance of the blades 30 and the bottom plate 10. Furthermore, in cooperation with the housing, the airflow is transformed from radial flow to axial flow, further improving the static pressure efficiency and improving the noise.

[0053] 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 extends 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, thereby reducing the loss of the airflow during turning and improving efficiency.

[0054] Combining the designs of D1 ≥ D3, D4 ≥ D2, and 0.7 ≤ D2 / D1 < 1, and the gradually decreasing diameter of the circles enclosed by the blades 30 in the axial direction of the air inlet, the diagonal flow impeller is configured as a non-uniform impeller. As shown in Figure 7, under conditions of equal air volume and efficiency, the required speed of the non-uniform impeller is significantly lower than that of the uniform impeller. Therefore, fans using non-uniform impellers can effectively increase loads and significantly reduce speeds while maintaining efficiency and air volume. For specific speed comparisons, please refer to the table below.

[0055]

[0056] 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 , wherein the trailing edge 33 is located on the outside of the leading edge 32 and is tilted toward the leading edge 32 , wherein the trailing edge 33 may be tilted as a whole or partially, thereby changing the phase difference of the airflow at the air outlet 34 , effectively reducing the superposition of noise energy and reducing noise.

[0057] Referring to Figures 5 and 6, in one embodiment, the trailing edge 33 is inclined relative to the axis of the air inlet 21, and the angle of inclination between the trailing edge 33 and the axis of the air inlet 21 is α, with 0°≤α≤45°. This allows the airflow in the axial direction of the impeller to vary significantly linearly, thereby improving noise. Specifically, one end of the trailing edge 33 is connected to the top plate 20, and the other end gradually inclines toward the bottom plate 10. The inclination direction forms an inclination angle α with the axial direction of the air inlet 21. Specific values ​​of this inclination angle can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, etc.

[0058] Furthermore, in one embodiment, the trailing edge 33 includes an inclined section 331 and an arc section 332, the arc section 332 protruding in a direction away from the leading edge 32, and one end is connected to the inclined section 331, and the other end is connected to the bottom edge 31. As shown in Figure 6, 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 stiffness 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's worth noting that, through the design of structural parameters such as shape and size, the diagonal flow impeller of this application outperforms the performance of a constant-diameter impeller. When used in a fan, as shown in Figure 8 and the table below, the efficiency of a fan employing a non-constant-diameter impeller of this solution is significantly improved compared to a fan employing a conventional solution. For a specific efficiency comparison, see Figure 8 and the table below.

[0061]

[0062] The present application also proposes a fan, which includes a diagonal flow impeller. The specific structure of the diagonal 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.

[0063] This application also provides a ventilation device including a fan. The specific structure of the fan is similar to that of the above-mentioned embodiments. Since this ventilation device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. The ventilation device can be a heat pump, an air conditioner, etc.

[0064] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A diagonal flow impeller, wherein: The diagonal flow impeller comprises: A bottom plate, used for connecting with a driving motor; a top plate having an air inlet; and 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 diagonal flow impeller according to claim 1, wherein: 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 inclined flow impeller according to claim 1 or 2, wherein: 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 inclined flow impeller according to any one of claims 1 to 3, wherein: 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 inclined flow impeller according to any one of claims 1 to 4, wherein: 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, wherein: 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 inclined flow impeller according to claim 6, wherein: 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 inclined flow impeller according to claim 6 or 7, wherein: 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 inclined flow impeller according to claim 8, wherein: 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 diagonal flow impeller according to claim 8 or 9, wherein: 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 inclined flow impeller according to any one of claims 8 to 10, wherein: The trailing edge includes an inclined section and a toothed structure, wherein the toothed structure is formed on the inclined section.

12. A fan, wherein: The fan comprises the inclined flow impeller according to any one of claims 1 to 11.

13. A ventilation device, wherein: The ventilation device comprises the fan as claimed in claim 12.

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