Blade, fan and air conditioning system

Abstract

The utility model relates to the technical field of fan equipment, and provides a blade, a fan and an air conditioning system. The blade comprises a blade body, the front edge of the blade body forms a front edge curve, the front edge curve comprises a front convex section and a flat section, the front convex section is located on the side, close to the blade tip of the blade body, of the flat section, and the middle of the front convex section protrudes towards the front side of the blade body. The special structures of the front convex section and the flat section in the front edge curve have a good rectification effect on inlet turbulent flow groups, non-uniform flow is limited in a small forward swept area at the top of the blade, acting of the middle area of the blade is basically not affected, and a draught fan still has high aerodynamic efficiency under the condition that the inlet is shielded.

Description

Technical Field

[0001] The utility model relates to the technical field of fan equipment, in particular to a blade, a fan and an air conditioning system. Background Art

[0002] In the outdoor unit of the air conditioner, the fan is an important component, and its performance directly affects the efficiency of the entire air conditioning system. In order to increase the air volume of the top-outlet air conditioner outdoor unit, the outer diameter of the fan is often made as large as possible, but this results in a closer distance between the fan's wind circle and the outer shell sheet metal. At the same time, since the heat exchanger is arranged under the fan, a cavity will be formed and complex turbulent groups will be generated, which will seriously affect the fan's work ability and reduce its efficiency.

[0003] Although the existing high-swept blade design can solve the lateral air intake and noise reduction problems to a certain extent, its rectification effect is not significant for the inlet turbulence problem caused by obstruction. Utility Model Content

[0004] The utility model provides a blade, a fan and an air conditioning system, which are used to solve the problem of poor rectification effect of the fan blade design in the prior art for the inlet turbulent group problem caused by shielding.

[0005] The utility model provides a blade, comprising a blade body, wherein the leading edge of the blade body forms a leading edge curve, the leading edge curve comprises a convex section and a flat section, the convex section is located on a side of the flat section close to the tip of the blade body, and the middle part of the convex section protrudes toward the front side of the blade body.

[0006] According to a blade provided by the utility model, the leading edge curve also includes a backward inclined section, and the backward inclined section gradually inclines toward the rear side of the blade body from an end close to the root of the blade body to an end away from the root of the blade body.

[0007] According to a blade provided by the utility model, the forward convex section, the flat section and the backward inclined section are connected in sequence.

[0008] According to a blade provided by the utility model, the forward inclination angle of the connection position between the flat section and the backward inclined section is -25°≤θ2≤-15°; the relative position of the blade height at the connection position between the flat section and the backward inclined section is 0.2≤H2≤0.3, wherein the relative position of the blade height refers to the ratio of the blade height at the location to the blade height.

[0009] According to a blade provided by the utility model, the difference between the forward inclination angle θ3 at the connection position between the flat section and the convex section and the forward inclination angle θ2 at the connection position between the flat section and the backward inclined section is 6°≤θ3-θ2≤12°; the difference between the relative position H3 of the blade height at the connection position between the flat section and the convex section and the relative position H2 of the blade height at the connection position between the flat section and the backward inclined section is 0.3≤H3-H2≤0.4, wherein the relative position of the blade height refers to the ratio of the blade height at the location to the blade height.

[0010] According to a blade provided by the utility model, the middle convex position of the convex section is the maximum forward sweep angle position of the blade body.

[0011] According to a blade provided by the utility model, the sweep angle of the middle convex position of the convex section is 10°≤θ4≤20°; the relative position of the leaf height at the middle convex position of the convex section is 0.91≤H4≤0.97, wherein the relative position of the leaf height refers to the ratio of the leaf height at the position to the blade height.

[0012] According to a blade provided by the utility model, the difference between the sweep angle θ4 at the middle convex position of the convex section and the sweep angle θ5 at one end of the convex section close to the blade tip is 8°≤θ4-θ5≤12°.

[0013] The utility model also provides a fan, comprising a hub and the blades as described above, wherein a plurality of blades are arranged at equal angles around the circumference of the hub.

[0014] The utility model also provides an air conditioning system, comprising the fan as described above.

[0015] The blades, fan and air-conditioning system provided by the utility model have a special structure of the convex section and the flat section in the leading edge curve, which has a good rectifying effect on the inlet turbulent flow group, restricting the uneven flow to a smaller forward swept area on the top of the blade, basically without affecting the work done in the middle area of ​​the blade, so that the fan still has a high aerodynamic efficiency when the inlet is blocked. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model 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 some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is one of the front views of an impeller provided by the utility model;

[0018] Figure 2 It is a side view of an impeller provided by the utility model;

[0019] Figure 3 This is the second front view of an impeller provided by the utility model;

[0020] Figure 4 This is the third front view of an impeller provided by the utility model;

[0021] Figure 5 It is one of the velocity vector distribution and blade surface pressure distribution diagrams of an impeller using a conventional blade structure;

[0022] Figure 6 This is the second diagram of velocity vector distribution and blade surface pressure distribution of an impeller using a traditional blade structure;

[0023] Figure 7 It is one of the velocity vector distribution and blade surface pressure distribution diagrams of an impeller using a blade provided by the utility model;

[0024] Figure 8 This is the second diagram of the velocity vector distribution of an impeller of a blade and the pressure distribution diagram on the blade surface provided by the utility model;

[0025] Reference numerals:

[0026] 10. Wheel hub;

[0027] 20. Blade body; 21. Forward convex section; 22. Flat section; 23. Rearward inclined section;

[0028] 30. Baseline for calculating sweep angle. DETAILED DESCRIPTION

[0029] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0030] In the description of the embodiments of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0032] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model embodiment. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] Combine the following Figures 1 to 8 The blade according to the embodiment of the utility model is described.

[0035] like Figure 1 and Figure 2 As shown, the blade of the embodiment of the utility model includes a blade body 20, the leading edge of the blade body 20 forms a leading edge curve, the leading edge curve includes a convex section 21 and a flat section 22, the convex section 21 is located on the side of the flat section 22 close to the tip of the blade body 20, and the middle part of the convex section 21 protrudes toward the front side of the blade body 20.

[0036] Specifically, the convex section 21 is located at a specific position of the leading edge curve, that is, on the side close to the tip of the blade body 20. This design enables the convex section 21 to first contact the fluid, such as air, when the blade rotates, thereby guiding the flow of the fluid. The middle part of the convex section 21 is specially designed to be convex toward the front side of the blade body 20. Such a shape can more effectively disperse the pressure in the fluid, reduce the resistance of the fluid on the blade surface, and thus improve the working efficiency of the blade.

[0037] The flat section 22 is located on the side of the convex section 21 away from the blade tip. The flat section 22 is designed mainly to maintain the stability of the blade in a specific area, and to work together with the convex section 21 to achieve smooth flow of the fluid. The existence of the flat section 22 also makes the manufacture of the blade easier and reduces the production cost.

[0038] The structure of the leading edge curve enables the blade to utilize the power of the fluid more effectively when working, thereby improving the energy conversion efficiency.

[0039] In summary, the blades of the utility model embodiment achieve efficient fluid guidance and effective pressure dispersion through the unique leading edge curve design, thereby improving the working efficiency and service life of the blades. At the same time, the design also takes into account the simplicity and cost-effectiveness of manufacturing, so that the blades of the utility model have a wide range of promotion value in practical applications.

[0040] In some embodiments of the present invention, the leading edge curve further includes a backward inclined section 23, which gradually inclines toward the rear side of the blade body 20 from one end close to the root of the blade body 20 to one end away from the root of the blade body 20. The inclined design of the backward inclined section 23 enables the blade to better adapt to changes in airflow during rotation, reducing the possibility of airflow separation and vortex generation.

[0041] By introducing the backward inclined section 23, the leading edge curve of the blade is further optimized. This not only helps to improve the overall aerodynamic performance of the blade, but also reduces energy loss to a certain extent. At the same time, the design of the backward inclined section 23 also takes into account the structural strength and stability of the blade, ensuring stable operation even in adverse weather conditions.

[0042] In some embodiments of the present invention, the front convex section 21, the flat section 22 and the rearward inclined section 23 are connected in sequence, so that the front edge curve can be S-shaped as a whole.

[0043] Specifically, the convex section 21 is located at the part of the leading edge curve of the blade close to the tip of the blade. Its main function is to guide the airflow so that the airflow can smoothly transition when entering the blade. The existence of the convex section 21 effectively reduces the turbulence and vortex generated by the airflow at the leading edge of the blade, thereby improving the aerodynamic performance of the blade. The flat section 22 is connected to the convex section 21. The main function of the flat section 22 is to maintain the stability of the airflow and ensure that the airflow can maintain a certain speed and direction when flowing through the blade. This design helps to reduce the loss of airflow and improve the energy conversion efficiency of the blade. The backward inclined section 23 is connected to the flat section 22, and together with the convex section 21 and the flat section 22, it forms a complete S-shaped leading edge curve. The main function of the backward inclined section 23 is to adjust the outflow angle of the airflow so that the airflow can smoothly enter the next flow channel or exhaust system when leaving the blade. The design of the backward inclined section 23 helps to improve the fluency and efficiency of the entire system.

[0044] The leading edge curve design of the utility model realizes smooth transition, stable flow and efficient conversion of airflow by sequentially connecting the convex section 21, the flat section 22 and the backward inclined section 23. This S-shaped leading edge curve has excellent aerodynamic performance and can effectively improve the working efficiency and service life of the blade.

[0045] In conjunction with the accompanying drawings, when the blade is set on the impeller, the ray formed by the leading edge point of the blade at the minimum blade height and the center of the impeller is defined as the sweep angle calculation reference line 30. This reference line is crucial for the subsequent calculation of the sweep angles at other blade height positions. The angle between the line segment formed by the leading edge point at other blade height positions and the center of the impeller and this sweep angle calculation reference line 30 is the sweep angle of this blade height. The positive and negative of this angle is determined by the rotation direction of the blade. Usually we assume that the clockwise direction shown in the figure is the positive direction and the counterclockwise direction is the negative direction. In particular, the sweep angle at the minimum blade height is defined as θ1, and because it is located at the minimum blade height, θ1=0, and the relative position H1 of the blade height at this point is also 0, because the relative position of the blade height is the ratio of the blade height at this point to the total height of the blade.

[0046] Combining convex 3 and Figure 4 In some embodiments of the utility model, the forward inclination angle at the junction of the flat section 22 and the rearward inclined section 23 is -25°≤θ2≤-15°; the relative position of the blade height at the junction of the flat section 22 and the rearward inclined section 23 is 0.2≤H2≤0.3, wherein the relative position of the blade height refers to the ratio of the blade height at the location to the blade height H.

[0047] The forward inclination angle θ2 is controlled within the range of -25° to -15°. This range is determined based on comprehensive considerations of aerodynamics and mechanical performance, aiming to achieve efficient energy conversion and stable operation of the blades. The relative position of the blade height H2, that is, the ratio of the blade height at the junction of the flat section 22 and the backward inclination section 23 to the total height of the blade, is limited to between 0.2 and 0.3. This design ensures that the wind energy capture and conversion efficiency is optimized during the rotation of the blades, while reducing vibration and noise, and improving the reliability and service life of the wind power generation device.

[0048] In some embodiments of the present invention, the difference between the forward inclination angle θ3 at the connection position of the flat section 22 and the convex section 21 and the forward inclination angle θ2 at the connection position of the flat section 22 and the rearward inclined section 23 is 6°≤θ3-θ2≤12°; the difference between the relative position H3 of the blade height at the connection position of the flat section 22 and the convex section 21 and the relative position H2 of the blade height at the connection position of the flat section 22 and the rearward inclined section 23 is 0.3≤H3-H2≤0.4, wherein the relative position of the blade height refers to the ratio of the blade height at the location to the blade height H.

[0049] In some embodiments of the utility model, the middle convex position of the convex section 21 is the maximum sweep angle position of the blade body 20. The middle convex design of the convex section 21 can make the leading edge curve at this position more prominent during the rotation of the blade, thereby more effectively guiding the airflow into the blade and improving the capture efficiency of wind energy. At the same time, the maximum sweep angle position is set in the middle of the convex section 21, which helps to optimize the aerodynamic layout of the blade, reduce the separation of airflow and the generation of vortices, and reduce energy loss.

[0050] In addition, the force distribution and mechanical properties of the blade can be further optimized by adjusting the middle convex position of the convex section 21 and the sweep angle of the blade body 20. This design can ensure that the blade has sufficient strength and stability when rotating at high speed, reduce vibration and noise, and improve the reliability and durability of the entire wind power generation device.

[0051] In summary, the utility model optimizes the aerodynamic performance and mechanical performance of the blade by designing the middle convex position of the convex section 21 as the position of the maximum forward sweep angle of the blade body 20.

[0052] Optionally, the sweep angle of the middle convex position of the convex section 21 is 10°≤θ4≤20°; the relative position of the leaf height of the middle convex position of the convex section 21 is 0.91≤H4≤0.97, wherein the relative position of the leaf height refers to the ratio of the leaf height at the position to the blade height H.

[0053] Optionally, the difference between the sweep angle θ4 at the middle convex position of the convex section 21 and the sweep angle θ5 at one end of the convex section 21 close to the blade tip is 8°≤θ4-θ5≤12°.

[0054] Figure 5 and Figure 6 The velocity vector distribution and blade surface pressure distribution of the impeller using the traditional blade structure are shown. For ease of expression, Figure 6 Colored illustrations are used. From the velocity vector distribution, it can be seen that after adding a baffle to the inlet (simulating the shielding of the heat exchanger), an obvious vortex will appear near the top area of ​​the inlet (as shown by the arrow). Due to the existence of the vortex, the airflow here cannot smoothly enter the blade and be compressed. On the surface of the traditional forward-swept blade design (from the top to the middle area), there will be an obvious low-pressure area (as shown by the black circle). This shows that the blade area here does not do work on the airflow, resulting in a decrease in the static pressure rise of the blade and a decrease in efficiency.

[0055] Figure 7 and Figure 8 The velocity vector distribution and the blade surface pressure distribution diagram of the impeller using a blade provided by the utility model are shown. For ease of expression, Figure 8 Color drawings are used. After adding a baffle to the inlet (simulating the obstruction of the heat exchanger), an obvious vortex will appear near the top area of ​​the inlet (as shown by the arrow). Due to the existence of the vortex, the airflow here cannot smoothly enter the blade and be compressed. The low-pressure area on the blade of this embodiment is limited to a small part of the forward-swept area at the top of the blade. Therefore, the addition of a baffle to the inlet has a relatively small effect on the static pressure rise and efficiency of the rectifier-type forward-swept design blade. This is caused by the high forward sweep at the top (convex section 21) and the sharp reduction in the forward sweep of the blade in the middle area (flat section 22). The high forward sweep at the top can quickly accelerate the low-speed airflow in the front and then flow through the blade, reducing losses.

[0056] It can be seen that the blade provided by the utility model has a special structure of the convex section 21 and the flat section 22 in the leading edge curve, which has a good rectifying effect on the inlet turbulent group, restricting the uneven flow to a smaller forward swept area at the top of the blade, basically without affecting the work done in the middle area of ​​the blade, so that the fan still has a high aerodynamic efficiency when the inlet is blocked.

[0057] The embodiment of the utility model further provides a fan, comprising a hub 10 and the above-mentioned blades, wherein a plurality of blades are arranged at equal angles around the circumference of the hub 10 .

[0058] The embodiment of the utility model further provides an air conditioning system, comprising the aforementioned fan, and introduces the excellent performance of the fan into the air conditioning system, providing an important guarantee for the efficient operation of the air conditioning system.

[0059] Specifically, air conditioning systems usually rely on fans to circulate and regulate air. The fan provided by the embodiment of the utility model can play an important role in air conditioning systems by virtue of its unique design and excellent performance. The leading edge curve design adopted by the fan enables the blades to better guide the air flow during rotation, reduce eddy currents and energy losses, and thus improve the air supply efficiency and operational stability of the air conditioning system.

[0060] In addition, the fan of the embodiment of the utility model also has the characteristics of high reliability and low noise. When the fan is running for a long time in the air-conditioning system, it can maintain good performance and stability, effectively reducing the frequency of failures and repairs. At the same time, the noise generated by the fan when it is running is relatively low, which helps to improve the overall comfort and user experience of the air-conditioning system.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A blade, characterized in that: The invention comprises a blade body (20), wherein the leading edge of the blade body (20) forms a leading edge curve, wherein the leading edge curve comprises a convex section (21) and a flat section (22), wherein the convex section (21) is located on a side of the flat section (22) close to the tip of the blade body (20), and the middle part of the convex section (21) protrudes toward the front side of the blade body (20).

2. The blade according to claim 1, characterized in that The middle convex position of the convex section (21) is the position where the forward sweep angle of the blade body (20) is maximum.

3. The blade according to claim 2, characterized in that The sweep angle of the middle convex position of the convex section (21) is 10°≤θ4≤20°; the relative position of the leaf height of the middle convex position of the convex section (21) is 0.91≤H4≤0.97, wherein the relative position of the leaf height refers to the ratio of the leaf height at the position to the blade height.

4. The blade according to claim 3, characterized in that The difference between the sweep angle θ4 at the middle convex position of the convex section (21) and the sweep angle θ5 at one end of the convex section (21) close to the blade tip is 8°≤θ4-θ5≤12°.

5. The blade according to any one of claims 1 to 4, characterized in that: The leading edge curve also includes a backward tilting section (23), and the backward tilting section (23) gradually tilts toward the rear side of the blade body (20) from an end close to the root of the blade body (20) to an end away from the root of the blade body (20).

6. The blade according to claim 5, characterized in that The forward convex section (21), the flat section (22) and the backward inclined section (23) are connected in sequence.

7. The blade according to claim 5, characterized in that The difference between the forward inclination angle θ3 at the connection position between the flat section (22) and the forward convex section (21) and the forward inclination angle θ2 at the connection position between the flat section (22) and the backward inclined section (23) is 6°≤θ3-θ2≤12°; the difference between the relative position H3 of the blade height at the connection position between the flat section (22) and the forward convex section (21) and the relative position H2 of the blade height at the connection position between the flat section (22) and the backward inclined section (23) is 0.3≤H3-H2≤0.4, wherein the relative position of the blade height refers to the ratio of the blade height at the location to the blade height.

8. The blade according to claim 5, characterized in that The forward inclination angle at the junction of the flat section (22) and the rearward inclination section (23) is -25°≤θ2≤-15°; The relative position of the blade height at the position where the flat section (22) and the backward inclined section (23) meet is 0.2≤H2≤0.3, wherein the relative position of the blade height refers to the ratio of the blade height at the position to the blade height.

9. A fan, characterized in that: The invention comprises a hub (10) and a blade according to any one of claims 1 to 8, wherein a plurality of blades are arranged at equal angular intervals around the circumference of the hub (10).

10. An air conditioning system, characterized in that: Comprising the fan as claimed in claim 9.

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