Fan blade, fan blade forming die, fan and blowing equipment
By optimizing the design of the fan blade structure, the mold structure is simplified and the noise is reduced, and the axial flow fan blade noise and mold complexity problems are solved, achieving cost reduction and performance guarantee.
Patent Information
- Application Number
- CN202323667607.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2024-12-24
- Estimated Expiration
- 2033-12-29
AI Technical Summary
The existing axial flow fan blades are noisy when in large gears, and the complex structure of the tips of the annular blades leads to complex mold design, increasing production costs and probability of edge penetration.
By optimizing the structure of the fan blade, the mold structure is simplified, and the inner top surface of the top sheet is designed with solid or virtual mold splitting lines, so that the first inner top surface and the second inner top surface can be successfully demolded after injection molding. Reduce mold manufacturing costs and reduce the probability of blade surface covering.
It has achieved simplification of the fan blade forming mold structure, reduce production costs, reduce blade surface edge covering, ensure product performance, and effectively reduce noise.
Smart Images
Figure CN222228957U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of blowing equipment, in particular to a fan blade, a fan blade forming mold, a fan and blowing equipment. Background Art
[0002] Blowing equipment is widely used in people's daily life. Among them, blowing equipment using axial flow fan blades (such as floor fans) is favored by many users because of its strong wind force and wide blowing range. However, when the blowing equipment is turned on a larger gear, the noise is often relatively loud, which will cause certain troubles to users. In the related art, some fan blades use annular blades to reduce noise, but due to the complex structure of the tip of the plastic annular blade, it is impossible to produce it with a mold or a mold with a complex structure needs to be designed for production. The complex mold structure will not only lead to high production costs, but also make it easy for the blade surface to produce a flash and affect product performance. Therefore, it is necessary to optimize the design of the fan blades. Utility Model Content
[0003] The main purpose of the utility model is to propose a fan blade, which aims to simplify the mold structure used to produce the fan blade by optimizing the structure of the fan blade, reduce the probability of burrs on the blade surface, and reduce production costs while ensuring product performance.
[0004] To achieve the above-mentioned purpose, the fan blade provided by the utility model comprises a hub and a plurality of blades arranged on the circumference of the hub; the blade comprises a top sheet body arranged away from the hub, at least one hollow area is formed between the top sheet body and the hub, the inner top surface of the top sheet body faces the hollow area, the inner top surface of the top sheet body has a physical or virtual parting line, and the parting line divides the inner top surface of the top sheet body into a first inner top surface and a second inner top surface;
[0005] In the axial projection front view of the fan blade, all points on the first inner top surface are visible, or some points on the first inner top surface overlap to form a first overlapped line segment, and all points on the first inner top surface except the first overlapped line segment are visible;
[0006] In the axially projected back view of the blade, all points on the second inner top surface are visible, or some points on the second inner top surface overlap to form a second overlapping line segment, and all points on the second inner top surface except the second overlapping line segment are visible.
[0007] In one of the embodiments, in the axial projection view of the fan blade, a first virtual line with a radius of R1 is constructed with the center of the hub as the center of the circle, and the first virtual line divides the blade into a blade body and a top sheet body, and the top sheet body is located on the side of the first virtual line away from the hub; the maximum distance between the side edge of the hollow area away from the hub and the first virtual line in the direction pointing to the center of the hub is d1, and the maximum size of the outer diameter of the fan blade is d0, satisfying 0.01d0≤d1≤0.2d0.
[0008] In one embodiment, the blade body includes a first sheet and a second sheet disposed on both sides of the hollow area along the rotation direction of the fan blade, the root of the first sheet and / or the root of the second sheet are connected to the hub, and the top sheet connects an end of the first sheet away from the hub with an end of the second sheet away from the hub; the hollow area is formed by the blade itself or by the blade and the hub.
[0009] In one embodiment, the first sheet has a first air induction surface and a first air induction back surface disposed opposite to each other, and the second sheet has a second air induction surface and a second air induction back surface disposed opposite to each other, and in the rotation direction of the fan blade, the first air induction surface is located in front of the second air induction surface;
[0010] The top sheet body has a first preset spatial twisting structure, so that the first air induction surface is connected to the second air induction back surface via the outer top surface of the top sheet body, and the first air induction back surface is connected to the second air induction surface via the inner top surface of the top sheet body;
[0011] Alternatively, the top sheet presents a second preset spatial twisting structure, so that the first air induction surface is connected to the second air induction back surface via the inner top surface of the top sheet, and the first air induction back surface is connected to the second air induction surface via the outer top surface of the top sheet.
[0012] In one embodiment, in the axial projection view of the fan blade, a second virtual line with a radius of R2 is constructed with the center of the hub as the center of the circle, wherein R2 is smaller than R1; the first sheet body forms the first wind-inducing surface and the first wind-inducing back surface at least in the portion located between the first virtual line and the second virtual line; the second sheet body forms the second wind-inducing surface and the second wind-inducing back surface at least in the portion located between the first virtual line and the second virtual line, and the distance between the first virtual line and the second virtual line in the radial direction of the fan blade is d2; and 0<d2<0.1d0 is satisfied.
[0013] In one embodiment, the root of the first sheet and the root of the second sheet are both connected to the wheel hub, and a gap is formed between the root of the first sheet and the root of the second sheet in the circumferential and / or axial direction of the wheel hub, and the first sheet, the top sheet, the second sheet, and the wheel hub are jointly arranged to form the hollow area.
[0014] In one embodiment, the minimum distance between the edge of the hollow area and the outermost side of the blade in the axial projection view of the blade is e, and the maximum thickness of the top sheet is f, wherein e=f.
[0015] The utility model also proposes a fan blade forming mold, which is used to form the fan blade as described above, and the fan blade forming mold includes a first mold core and a second mold core, the first mold core is used to form the first inner top surface, and the second mold core is used to form the second inner top surface, the first mold core can be demolded from the hollow area along the parting line toward one end of the hub, and the second mold core can be demolded from the hollow area along the parting line toward the other end of the hub.
[0016] The utility model also provides a fan, comprising a fan blade and a driving member drivingly connected to the fan blade, wherein the driving member is used to drive the fan blade to rotate, and the fan blade is the fan blade as described above.
[0017] The utility model also provides a blowing device, comprising the fan blade or the fan as described above.
[0018] The technical solution of the utility model optimizes the structure of the fan blade, especially optimizes the structure of the top sheet of the blade, so that in the front view of the fan blade, all points on the first inner top surface are visible without being blocked by other surfaces; or some points on the first inner top surface overlap to form a first overlap line segment, and all points on the first inner top surface except the first overlap line segment are visible without being blocked by other surfaces; in this way, there is no undercut structure on the first inner top surface, and after the injection molding is completed, the first mold core used to form the first inner top surface can be pulled out from the front of the fan blade along the parting line. In the back view of the fan blade, all points on the second inner top surface are visible; or some points on the second inner top surface overlap to form a second overlap line segment, and all points on the second inner top surface except the second overlap line segment are visible without being blocked by other surfaces; in this way, there is no undercut structure on the second inner top surface, and after the injection molding is completed, the second mold core used to form the second inner top surface can be pulled out from the back of the fan blade along the parting line. In this way, the structure of the fan blade forming mold can be simplified, the mold manufacturing cost can be reduced, and thus the production cost of the fan blade injection molding can be reduced; and only one parting line needs to be designed on the inner top surface of the top sheet, so that the number of parting lines is minimized, which can reduce the probability of burrs on the blade surface, and reduce production costs while ensuring product performance. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] 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 only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.
[0020] Figure 1 It is a front elevation view of a fan blade of an embodiment of the prior art;
[0021] Figure 2 for Figure 1 A partial enlarged view of point F in the middle;
[0022] Figure 3 This is a front oblique view of the first embodiment of the fan blade of the utility model;
[0023] Figure 4 for Figure 3 A partial enlarged view of the middle A;
[0024] Figure 5 for Figure 3 Front elevation view of the middle fan blade;
[0025] Figure 6 for Figure 5 A partial enlarged view of point B in the middle;
[0026] Figure 7 To use the first virtual line pair Figure 3 A schematic diagram of the segmentation of the front elevation view of the middle fan blade;
[0027] Figure 8 To use the first virtual line and the second virtual line pair Figure 3 A schematic diagram of the segmentation of the front elevation view of the middle fan blade;
[0028] Fig. 9 To use the first virtual line and the second virtual line pair Figure 3 A schematic diagram of the segmentation of the back view of the middle fan blade;
[0029] Fig.10 To use the first virtual line and the third virtual line pair Figure 3 A schematic diagram of the segmentation of the front elevation view of the middle fan blade;
[0030] Fig.11 To use the first virtual line and the third virtual line Figure 3 Schematic diagram of the structure of one of the middle fan blades after cutting;
[0031] Fig.12 for Fig.10 A partial enlarged schematic diagram of point C in the middle (showing only the first inner top surface of the top sheet);
[0032] Fig.13 This is a front oblique view of the second embodiment of the fan blade of the utility model;
[0033] Fig.14 for Fig.13 A partial enlarged view of point D in the middle;
[0034] Fig.15 for Fig.13 Oblique view of the back of the middle fan blade;
[0035] Fig.16 for Fig.15 A partial enlarged view of point E in the middle;
[0036] Fig.17 To use the first virtual line and the second virtual line pair Fig.13 A schematic diagram of the segmentation of the front elevation view of the middle fan blade;
[0037] Fig.18 To use the first virtual line and the second virtual line pair Fig.13 A schematic diagram of the segmentation of the back view of the middle fan blade;
[0038] Fig.19 This is a schematic structural diagram of a third embodiment of the fan blade of the utility model;
[0039] Fig. 20This is a schematic structural diagram of a fourth embodiment of the fan blade of the utility model;
[0040] Fig.21 This is a schematic structural diagram of the fifth embodiment of the fan blade of the utility model;
[0041] Fig. 22 It is a structural schematic diagram of the sixth embodiment of the fan blade of the utility model.
[0042] Description of Figure Numbers:
[0043] Label name Label name 100 Fan blade 22 Blade body 10 Wheels 221 The first piece 11 Hub Center 221a First wind side 20 blade 221b The back of the first vent 21 Top sheet 222 The second piece 211 Inner top surface 222a Second wind side 211a Parting line 222b The back of the second air inlet 2111 First inner top surface 101 Hollow area 2112 Second inner top surface 200a First Virtual Line 2111a First coincident line segment 200b Second virtual line 212 External top surface 200c The third virtual line 30 Second blade 50 Connecting blades 40 Separator ring 100' Fan blade 20' blade 10' Wheels 101' Hollow area
[0044] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION
[0045] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0046] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.
[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, 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 limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, 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 this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.
[0048] Please refer to Figure 1, is a front elevation view of a fan blade 100' in an embodiment of the prior art (it can also be regarded as an axial projection front view of the fan blade 100'). In the prior art, the fan blade 100' includes a hub 10' and a plurality of blades 20' arranged on the circumference of the hub 10'. The blades 20' and the hub 10' are arranged to form an annular structure with a hollow area 101'. The tip of the blade 20' (i.e., the part of the blade 20' away from the hub 10') is complex in shape. Figure 1 Taking the blade 20' located at the upper left corner as an example, in the axial projection front view of the fan blade 100' (ie, Figure 1 As shown in the figure, it can be seen that there is an undercut structure at the tip of the blade 20', which makes demoulding more difficult. Usually, a complex mold structure needs to be designed to successfully demould, which will lead to high mold manufacturing costs and thus high product production costs. Due to the complex mold design, it is usually necessary to design multiple demoulding lines at the tip of the blade, and flash is easily generated at the demoulding line during injection molding, which greatly increases the probability of flash on the blade surface, affecting the overall performance of the product.
[0049] The utility model provides a fan blade 100.
[0050] Please refer to Figure 3 and Fig.13 In an embodiment of the utility model, the fan blade 100 includes a hub 10 and a plurality of blades 20 arranged on the circumference of the hub 10. Specifically, the number of blades 20 of the fan blade 100 can be set as needed, for example, it can be designed to be two, three, four, five or more, which is not specifically limited here. In order to ensure the structural strength of the fan blade 100, optionally, the blade 20 and the hub 10 are integrally injection molded. It should be noted that the fan blade 100 of the utility model can simplify the mold structure through structural optimization design, which is more conducive to production and manufacturing by injection molding, but this does not limit the fan blade 100 to be manufactured by injection molding. In actual applications, other processing methods can also be used for production and manufacturing. The following mainly takes one of the blade 20 structures of the fan blade 100 as an example, and the structures of other blades 20 are the same or similar.
[0051] Please refer to Figures 7 to 11The blade 20 includes a top sheet 21 disposed away from the hub 10, at least one hollow area 101 is formed between the top sheet 21 and the hub 10, an inner top surface 211 of the top sheet 21 faces the hollow area 101, and the inner top surface 211 of the top sheet 21 has a solid or virtual parting line 211a, and the parting line 211a divides the inner top surface 211 of the top sheet 21 into a first inner top surface 2111 and a second inner top surface 2112. The top sheet 21 of the blade 20 can be regarded as the tip of the blade 20, and the blade 20 can be a completely closed annular structure, and the hollow area 101 is surrounded by the blade 20 itself, or the blade 20 can be a non-closed annular structure, and the fracture part of the blade 20 is connected to the hub 10, so that the blade 20 and the hub 10 jointly construct the hollow area 101. The side of the top sheet 21 close to the hub 10 is its inner top surface 211 , and the side of the top sheet 21 away from the hub 10 is its outer top surface 212 , that is, the inner top surface 211 of the top sheet 21 faces the hollow area 101 .
[0052] In order to facilitate observation of the structure of the top sheet 21, Fig.10 and Fig.11 As shown, with the hub center 11 as the center, a first virtual line 200a with a radius of R1 and a third virtual line 200c with a radius of R3 are constructed respectively, wherein R3 is smaller than R1, and in the radial direction of the fan blade 100, the distance between the first virtual line 200a and the third virtual line 200c is d3. The top sheet 21 can be separated by removing the portion of one of the blades 20 of the fan blade 100 between the first virtual line 200a and the third virtual line 200c.
[0053] The inner top surface 211 of the top sheet 21 has a physical or virtual parting line 211a. It should be pointed out that the parting line 211a can be a physical parting line 211a (that is, a line that can be clearly observed in the inner top surface 211), or the parting line 211a can also be a virtual parting line 211a (that is, it is not easy to observe in the inner top surface 211, but it is a virtual line on the inner top surface 211 corresponding to the part where the two mold cores for molding the inner top surface 211 are close to each other). It should be noted that the parting line 211a can be formed by connecting multiple line segments, or it can be a single line segment. The parting line 211a can be parallel to the rotation axis of the fan blade 100, or it can be inclined relative to the rotation axis. The parting line 211a divides the inner top surface 211 of the top sheet 21 into a first inner top surface 2111 and a second inner top surface 2112. Thus, when designing a mold, it is only necessary to design a first mold core and a second mold core respectively for the first inner top surface 2111 and the second inner top surface 2112, and the parting line 211a is located between the first mold core and the second mold core.
[0054] In order to facilitate smooth demoulding when forming the first inner top surface 2111, the top sheet 21 can be constructed so that in the axial projection front view of the fan blade 100 (that is, as shown in FIG. Figure 8 and Fig.17 In the front elevation view of the fan blade 100 shown in the figure, all points on the first inner top surface 2111 are visible. In other words, when observing from the front side of the fan blade 100 toward the back side, any point constituting the first inner top surface 2111 can be observed. In other words, all points on the first inner top surface 2111 are not blocked by other surfaces, so that no undercut will occur. When demolding, the first mold core used to form the first inner top surface 2111 can be directly pulled out toward the front side of the fan blade 100. Alternatively, Fig.12 As shown, the top sheet 21 is constructed such that, in the axial projection front view of the fan blade 100, some points on the first inner top surface 2111 overlap to form a first overlapping line segment 2111a, and all points on the first inner top surface 2111 except the first overlapping line segment 2111a are visible. It is worth noting that, in the axial projection front view of the fan blade 100, some points on the first inner top surface 2111 overlap to form a first overlapping line segment 2111a, which means that the first overlapping line segment 2111 is also visible in this view. In other words, in the axial projection front view of the fan blade 100, the first overlapping line segment 2111a and all points on the first inner top surface 2111 except the first overlapping line segment 2111a can be observed. That is, in this embodiment, it is allowed that some points on the first inner top surface 2111 are mutually blocked. At this time, the mutually blocked points form a first coincident line segment 2111a. Since the first coincident line segment 2111a is a line, not a surface, it will not affect demoulding. That is, when observing from the front side of the fan blade 100 toward the back side, the first coincident line segment 2111a and any other point on the first inner top surface 2111 can be observed. In this way, no undercut will be generated. When demoulding, the first mold core used to form the first inner top surface 2111 can be directly pulled out toward the front side of the fan blade 100.
[0055] Similarly, in order to facilitate smooth demoulding when forming the second inner top surface 2112, the top sheet 21 can be constructed so that in the axial projection back view of the fan blade 100 (that is, as shown in FIG. Fig. 9 and Fig.18In the back front view of the fan blade 100 shown in the figure, all points on the second inner top surface 2112 are visible. That is, when observing from the back of the fan blade 100 toward the front, any point used to constitute the second inner top surface 2112 can be observed, that is to say, all points on the second inner top surface 2112 are not blocked by other surfaces, so that no undercut will occur. When demolding, the second mold core used to form the second inner top surface 2112 can be directly pulled out toward the back of the fan blade 100. Alternatively, the top sheet 21 can also be constructed so that some points on the second inner top surface 2112 overlap to form a second overlapping line segment, and the second overlapping line segment and all points on the second inner top surface 2112 except the second overlapping line segment are all visible. It is worth noting that in the axial projection back view of the fan blade 100, some points on the second inner top surface 2112 overlap to form a second overlapping line segment, which means that the second overlapping line segment is also visible in this view. That is to say, the second coincident line segment and all points on the second inner top surface 2112 except the second coincident line segment can be observed in the axial projection back view of the fan blade 100. That is, in this embodiment, it is allowed that some points on the second inner top surface 2112 are mutually blocked. At this time, the mutually blocked points form a second coincident line segment. Since the second coincident line segment is a line, not a surface, it will not affect the demolding. That is, when observing from the front side of the fan blade 100 toward the back side, the second coincident line segment and any other point on the second inner top surface 2112 can be observed, so that no undercut will be generated. When demolding, the second mold core used to form the second inner top surface 2112 can be directly pulled out toward the back side of the fan blade 100.
[0056] The technical solution of the utility model optimizes the structure of the fan blade 100, especially the top sheet 21 (i.e., the tip portion) of the blade 20, so that in the front elevation view of the fan blade 100, all points on the first inner top surface 2111 are visible without being blocked by other surfaces; or some points on the first inner top surface 2111 overlap to form a first overlapping line segment 2111a, and the first overlapping line segment 2111a and all points on the first inner top surface 2111 except the first overlapping line segment 2111a are visible without being blocked by other surfaces; in this way, there is no undercut structure on the first inner top surface 2111, and after the injection molding is completed, the first mold core used to mold the first inner top surface 2111 can be pulled out from the front of the fan blade 100 along the parting line 211a. In the back front view of the fan blade 100, all points on the second inner top surface 2112 are visible; or some points on the second inner top surface 2112 overlap to form a second overlap line segment, and the second overlap line segment and all points on the second inner top surface 2112 except the second overlap line segment are visible without being blocked by other surfaces; in this way, there is no undercut structure on the second inner top surface 2112, and after the injection molding is completed, the second mold core used to mold the second inner top surface 2112 can be pulled out from the back of the fan blade 100 along the parting line 211a. In this way, the structure of the fan blade 100 molding mold can be simplified, the mold manufacturing cost can be reduced, and then the production cost of the fan blade 100 injection molding can be reduced; and only one parting line 211a needs to be designed on the inner top surface 211 of the top sheet 21, so that the number of parting lines 211a is minimized, which can reduce the probability of flashing on the surface of the blade 20, and can reduce the production cost while ensuring product performance.
[0057] It is understandable that when the mold structure used to mold the fan blade 100 is too complex, the difficulty of the production process is greatly increased, and it is difficult to control the production accuracy and quality of the fan blade 100, which can easily lead to problems of uneven thickness and quality in various parts of the fan blade 100 during injection molding, and then cause the fan blade 100 to have dynamic balance problems, affecting product performance. This technical solution can simplify the mold structure and reduce the difficulty of production by optimizing the structure of the fan blade 100, which is conducive to controlling the production accuracy and quality of the fan blade 100, and can reduce the probability of dynamic balance problems in the fan blade 100 to a certain extent, ensuring product performance.
[0058] Please refer to Figure 5 and Figure 7In one embodiment, in the axial projection view of the fan blade 100, a first virtual line 200a with a radius of R1 is constructed with the center of the hub 10 (that is, the hub center 11) as the center of the circle, and the first virtual line 200a divides the blade 20 into a blade 20 body 22 and the top sheet 21, and the top sheet 21 is located on the side of the first virtual line 200a away from the hub 10; the maximum distance between the side edge of the hollow area 101 away from the hub 10 in the direction pointing to the hub center 11 of the hub 10 and the first virtual line 200a is d1, and the maximum outer diameter of the fan blade 100 is d0, satisfying 0.01d0≤d1≤0.2d0.
[0059] In this embodiment, the first virtual line 200a is a circle concentric with the hub 10, and the blade 20 can be divided into two parts, the blade 20 body 22 and the top sheet 21, through the first virtual line 200a, wherein the blade 20 body 22 is located on the side of the first virtual line 200a close to the hub 10, and the top sheet 21 is located on the side of the first virtual line 200a away from the hub 10. Among them, 0.01d0≤d1≤0.2d0, so that the size of the top sheet 21 is moderate, which is conducive to the top sheet 21 to play a guiding role, achieve a better noise reduction effect, and also facilitate the demoulding of the top sheet 21.
[0060] There are various ways to construct the hollow area 101 of the fan blade 100. In some embodiments, the blade 20 body 22 includes a first sheet 221 and a second sheet 222 which are arranged on both sides of the hollow area 101 along the rotation direction of the fan blade 100. The root of the first sheet 221 and / or the root of the second sheet 222 are connected to the hub 10, and the top sheet 21 connects the end of the first sheet 221 away from the hub 10 with the end of the second sheet 222 away from the hub 10; the hollow area 101 is formed by the blade 20 itself or by the blade 20 and the hub 10.
[0061] In this embodiment, the end of the first sheet 221 away from the hub 10 and the end of the second sheet 222 away from the hub 10 are close to each other and connected through the top sheet 21, wherein the top sheet 21 is the tip of the blade 20. The root of the first sheet 221 and / or the root of the second sheet 222 is connected to the hub 10, for example, Figure 3 , Fig.13 and Fig.21As shown, in some embodiments, the root of the first sheet 221 and the root of the second sheet 222 may be connected to the hub 10. When there is a gap between the root of the first sheet 221 and the root of the second sheet 222 on the outer circumference of the hub 10, the first sheet 221, the top sheet 21, the second sheet 222 and the hub 10 are jointly formed to form an annular structure with a hollow area 101, that is, the hollow area 101 is jointly formed by the blades 20 and the hub 10. In addition, Fig.21 As shown, in one embodiment, a second blade 30 having a different shape from the blade 20 may be provided between two adjacent blades 20. When the fan blade 100 rotates, since the blade 20 and the second blade 30 have different shapes, it is possible to avoid the blade 20 and the second blade 30 from resonating at the same frequency and causing noise superposition, which is beneficial to reducing the overall noise of the fan blade 100.
[0062] For example, Fig.19 As shown, the root of the first sheet 221 may be connected to the hub 10, and the root of the second sheet 222 may be connected to the first sheet 221; of course, the root of the second sheet 222 may be connected to the hub 10, and the root of the first sheet 221 may be connected to the second sheet 222; Fig. 20 As shown, the root of the first sheet 221 and the root of the second sheet 222 merge and are connected to the hub 10; in the above-mentioned embodiments, the first sheet 221, the top sheet 21 and the second sheet 222 are jointly arranged to form an annular structure with a hollow area 101, that is, the hollow area 101 is formed by the blade 20 itself. The structure of the entire blade 20 is simple and presents a vortex ring structure. When the fan blade 100 rotates, the airflow vortex at the tail of the sheet (such as the first sheet 221) on the front side can flow along the top sheet 21 to the sheet (the second sheet 222) on the rear side, which can effectively reduce the vortex noise at the tail of the sheet on the front side, thereby effectively reducing the noise of the operation of the fan blade 100.
[0063] Furthermore, in some embodiments, the hollow area 101 may also be formed by the blades 20 and a structure disposed on the periphery of the hub 10 .
[0064] For example, Fig. 22As shown, in one embodiment, the fan blade 100 also includes a separating ring 40 arranged around the periphery of the hub 10, and the blade body 22 includes a first sheet 221 and a second sheet 222 which are arranged on both sides of the hollow area 101 along the rotation direction of the fan blade 100, the root of the first sheet 221 and the root of the second sheet 222 are connected to the separating ring 40, and the root of the second sheet 221 and the root of the second sheet 222 form a gap on the outer peripheral surface of the separating ring 40, and the top sheet 21 connects the end of the first sheet 221 away from the separating ring 40 with the end of the second sheet 222 away from the separating ring 40; at this time, the hollow area 101 is formed by the blade 20 and the separating ring 40.
[0065] Among them, the hub 10 and the separation ring 40 can be connected by a plurality of connecting blades 50. For example, a plurality of connecting blades 50 can be arranged at intervals on the outer periphery of the hub 10, and the separation ring 40 is arranged around the outer periphery of the plurality of connecting blades 50, and a blade 20 is provided on the outer periphery of the separation ring 40 corresponding to each connecting blade 50. Of course, the blades 20 and the connecting blades 50 can also be arranged staggered in the circumferential direction of the hub 10. In addition, the number of blades 20 and the connecting blades 50 can be the same or different. In this way, when the fan blade rotates, the connecting blades 50 located in the inner ring and the blades 20 located in the outer side can both play a blowing role, and can expand the blowing range of the fan blade 100 in the radial direction. And the connecting blades 50 and the blades 20 are separated by the separation ring 40, so that when the fan blade 100 rotates, the airflow vortex generated at the top of the connecting blade 50 located in the inner ring can be blocked by the separation ring 40, suppressing the shedding vortex noise at the top, thereby reducing the overall noise of the fan blade 100.
[0066] Of course, in some embodiments, the root of the first sheet 221 and the root of the second sheet 222 may merge to form a root sheet and then be connected to the separating ring 40; or the root of one of the first sheet 221 and the second sheet 222 may be connected to the separating ring 40, and the root of the other may be connected to the other sheet; in this case, the hollow area 101 is formed by the blade 20 itself.
[0067] like Figure 3 and Fig.13 As shown, in some embodiments, the top sheet 21 presents a spatial twisted structure, so that the wind-inducing surface of the first sheet 221 can be connected to the wind-inducing back surface of the second sheet 222 via the top sheet 21, and the wind-inducing back surface of the first sheet 221 can be connected to the wind-inducing surface of the second sheet 222 via the top sheet 21.
[0068] Please combine Figure 8 and Fig. 9 ,as well as Fig.17 and Fig.18Specifically, the first sheet 221 has a first wind-inducing surface 221a and a first wind-inducing back surface 221b that are disposed opposite to each other, and the second sheet 222 has a second wind-inducing surface 222a and a second wind-inducing back surface 222b that are disposed opposite to each other. In the rotation direction of the fan blade 100, the first wind-inducing surface 221a is located in front of the second wind-inducing surface 222a. As shown in the figure, in the front elevation view of the fan blade 100, the first blade 20 is located in front of the second blade 20 in the rotation direction of the fan blade 100, the first blade 20 in the rotation direction of the fan blade 100 faces forward as the first wind-inducing surface 221a, and the face opposite thereto is the first wind-inducing back surface 221b, the second blade 20 in the rotation direction of the fan blade 100 faces forward as the second wind-inducing surface 222a, and the face opposite thereto is the second wind-inducing back surface 222b.
[0069] like Figure 3 , Figures 7 to 9 As shown, in one embodiment, the top sheet 21 presents a first preset spatial twisting structure, so that the first air induction surface 221a is connected to the second air induction back surface 222b via the outer top surface 212 of the top sheet 21, and the first air induction back surface 221b is connected to the second air induction surface 222a via the inner top surface 211 of the top sheet 21. In this embodiment, the airflow vortex of the first air induction surface 221a can be guided to the second air induction back surface 222b via the outer top surface 212 of the top sheet 21, so as to reduce the airflow shedding vortex noise at the tip of the blade and reduce the noise of the fan blade 100 during operation. Optionally, the first air induction surface 221a, the outer top surface 212 of the top sheet 21, and the second air induction back surface 222b are smoothly transitioned and connected; and / or, the first air induction back surface 221b, the inner top surface 211 of the top sheet 21, and the second air induction surface 222a are smoothly transitioned and connected; in this way, the airflow movement can be smoother and a better noise reduction effect can be achieved.
[0070] Please refer to Figures 13 to 18In another embodiment, the top sheet 21 is in a second preset spatial twisting structure, so that the first air induction surface 221a is connected to the second air induction back surface 222b via the inner top surface 211 of the top sheet 21, and the first air induction back surface 221b is connected to the second air induction surface 222a via the outer top surface 212 of the top sheet 21. In this embodiment, the airflow vortex of the first air induction surface 221a can be guided to the second air induction back surface 222b via the inner top surface 211 of the top sheet 21, so as to reduce the airflow shedding vortex noise at the tip of the blade and reduce the noise of the fan blade 100 during operation. Optionally, the first air induction surface 221a, the inner top surface 211 of the top sheet 21, and the second air induction back surface 222b are smoothly transitioned and connected; and / or, the first air induction back surface 221b, the outer top surface 212 of the top sheet 21, and the second air induction surface 222a are smoothly transitioned and connected; in this way, the airflow movement can be smoother and a better noise reduction effect can be achieved.
[0071] Please refer to Figure 8 and Fig. 9 ,as well as Fig.17 and Fig.18 In some embodiments, in the axial projection view of the fan blade 100, a second virtual line 200b with a radius of R2 is constructed with the center of the hub 10 as the center of the circle, wherein R2 is smaller than R1; the first sheet 221 forms the first wind-inducing surface 221a and the first wind-inducing back surface 221b at least at a position between the first virtual line 200a and the second virtual line 200b; the second sheet 222 forms the second wind-inducing surface 222a and the second wind-inducing back surface 222b at least at a position between the first virtual line 200a and the second virtual line 200b, and the distance between the first virtual line 200a and the second virtual line 200b in the radial direction of the fan blade 100 is d2; 0<d2<0.1d0 is satisfied. That is to say, the first wind-inducing surface 221a and the first wind-inducing back surface 221b are at least formed on the first sheet 221 between the first virtual line 200a and the second virtual line 200b, and of course, they can also extend to the entire first sheet 221. The second air induction surface 222a and the second air induction back surface 222b are at least formed on the second sheet 222 between the first virtual line 200a and the second virtual line 200b, and of course, can also extend to the entire second sheet 222. In this way, the first sheet 221 and the second sheet 222 have a more flexible construction method.
[0072] Specifically, if Figure 8 and Fig.17As shown, the front elevation view of the fan blade 100 (which can also be regarded as the axial projection front view of the fan blade 100) is divided by the first virtual line 200a and the second virtual line 200b. At this time, the first blade 20 forms a first wind-inducing surface 221a at least in the area between the first virtual line 200a and the second virtual line 200b; of course, the first wind-inducing surface 221a can also extend along the first blade 20 to a position close to the hub 10; the second blade 20 forms a second wind-inducing surface 222a at least in the area between the first virtual line 200a and the second virtual line 200b; of course, the second wind-inducing surface 222a can also extend along the second blade 20 to a position close to the hub 10. Fig. 9 and Fig.18 As shown, the back front view of the fan blade 100 (which can also be regarded as the axial projection back view of the fan blade 100) is divided by the first virtual line 200a and the second virtual line 200b. At this time, the first blade 20 forms a first air-inducing back side 221b in the area between the first virtual line 200a and the second virtual line 200b; of course, the first air-inducing back side 221b can also extend along the first blade 20 to a position close to the hub 10; the second blade 20 forms a second air-inducing back side 222b in the area between the first virtual line 200a and the second virtual line 200b; of course, the second air-inducing back side 222b can also extend along the second blade 20 to a position close to the hub 10.
[0073] Please refer to Figure 3 and Fig.13 In some embodiments, the root of the first sheet 221 and the root of the second sheet 222 are both connected to the hub 10, and a gap is formed between the root of the first sheet 221 and the root of the second sheet 222 in the circumferential direction and / or axial direction of the hub 10, and the first sheet 221, the top sheet 21, the second sheet 222, and the hub 10 are jointly formed to form the hollow area 101. In this embodiment, a gap is formed between the root of the first sheet 221 and the root of the second sheet 222, so that the interference and shielding between the first sheet 221 and the second sheet 222 can be further reduced, which is more conducive to demolding the blade 20 during injection molding.
[0074] like Figure 1 and Figure 2 As shown, in the prior art, in the axial projection view of the fan blade 100', the minimum distance between the hollow area 101' and the outermost side of the blade 20' is g, and the maximum thickness of the blade 20' at the tip is h, wherein g is greater than h. This structural design is not conducive to demolding the inner top surface of the blade 20'.
[0075] In order to further improve the demoulding convenience, based on the above embodiment, Figures 3 to 6As shown, in one embodiment, in the axial projection view of the fan blade 100, the minimum distance between the edge of the hollow area 101 and the outermost side of the blade 20 is e, and the maximum thickness of the top sheet 21 is f, wherein e=f.
[0076] The utility model also proposes a fan blade 100 molding die for molding the fan blade 100. The specific structure of the fan blade 100 refers to the above embodiment and will not be repeated here. The fan blade 100 molding die includes a first mold core and a second mold core, the first mold core is used to mold the first inner top surface 2111, the second mold core is used to mold the second inner top surface 2112, the first mold core can be demolded from the hollow area 101 along the parting line 211a toward one end of the hub 10, and the second mold core can be demolded from the hollow area 101 along the parting line 211a toward the other end of the hub 10.
[0077] Specifically, Figure 8 and Fig.17 As shown, in the front elevation view of the fan blade 100 (which can also be regarded as the axial projection front view of the fan blade 100), all points on the first inner top surface 2111 are visible without being blocked by other surfaces, or some points on the first inner top surface 2111 overlap to form a first overlapping line segment 2111a, and the first overlapping line segment 2111a and all points on the first inner top surface 2111 except the first overlapping line segment 2111a are visible without being blocked by other surfaces, so that there is no undercut structure on the first inner top surface 2111, and after the injection molding is completed, the first mold core used to mold the first inner top surface 2111 can be pulled out from the front of the fan blade 100 along the parting line 211a; Fig. 9 and Fig.18As shown, in the back front view of the fan blade 100 (which can also be regarded as the axial projection back view of the fan blade 100), all points on the second inner top surface 2112 are visible, or some points on the second inner top surface 2112 overlap to form a second overlap line segment, and the second overlap line segment and all points on the second inner top surface 2112 except the second overlap line segment are visible without being blocked by other surfaces, so that there is no undercut structure on the second inner top surface 2112, and after the injection molding is completed, the second mold core used to mold the second inner top surface 2112 can be pulled out from the back of the fan blade 100 along the parting line 211a. In this way, the structure of the fan blade 100 molding mold can be simplified, the mold manufacturing cost can be reduced, and then the production cost of the fan blade 100 injection molding can be reduced; and only one parting line 211a needs to be designed on the inner top surface 211 of the top sheet 21, so that the number of parting lines 211a is minimized, which can reduce the probability of the blade 20 surface generating a flash. In addition, the mold structure is simplified, which can reduce the difficulty of production and is conducive to controlling the production accuracy and quality of the fan blade 100. To a certain extent, it can reduce the probability of dynamic balance problems in the fan blade 100 and ensure the performance of the product.
[0078] The utility model also proposes a fan, including a fan blade 100 and a driving member connected to the fan blade 100, and the driving member is used to drive the fan blade 100 to rotate. The specific structure of the fan blade 100 refers to the above embodiment. Since the fan 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 repeated here. Among them, the fan can be specifically an axial flow fan with axial flow fan blades 100, and the driving member can specifically be a driving motor.
[0079] The utility model also proposes a blowing device, including a fan blade 100 or a fan. The specific structure of the fan blade 100 or the fan refers to the above embodiment. Since the blowing 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 repeated here. Among them, the blowing device includes but is not limited to fan products such as floor fans, ceiling fans, and desktop fans. The blowing device can also be other devices with axial flow fan blades 100 (such as air conditioner outdoor units). By adopting the above-mentioned fan blades 100 or fans, the noise of the blowing device can be effectively reduced and the user experience can be improved.
[0080] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.
Claims
1. A fan blade, characterized in that: The invention comprises a hub and a plurality of blades arranged on the circumference of the hub; the blades comprise a top sheet arranged away from the hub, at least one hollow area is formed between the top sheet and the hub, the inner top surface of the top sheet faces the hollow area, the inner top surface of the top sheet has a physical or virtual parting line, and the parting line divides the inner top surface of the top sheet into a first inner top surface and a second inner top surface; In the axial projection front view of the fan blade, all points on the first inner top surface are visible, or some points on the first inner top surface overlap to form a first overlapped line segment, and all points on the first inner top surface except the first overlapped line segment are visible; In the axially projected back view of the blade, all points on the second inner top surface are visible, or some points on the second inner top surface overlap to form a second overlapping line segment, and all points on the second inner top surface except the second overlapping line segment are visible.
2. The fan blade according to claim 1, characterized in that: In the axial projection view of the fan blade, a first virtual line with a radius of R1 is constructed with the center of the hub as the center of the circle, and the first virtual line divides the blade into a blade body and a top sheet body, and the top sheet body is located on the side of the first virtual line away from the hub; the maximum distance between the side edge of the hollow area away from the hub and the first virtual line in the direction pointing to the center of the hub is d1, and the maximum dimension of the outer diameter of the fan blade is d0, satisfying 0.01d0≤d1≤0.2d0.
3. The fan blade according to claim 2, characterized in that: The blade body comprises a first sheet and a second sheet disposed on both sides of the hollow area along the rotation direction of the blade, the root of the first sheet and / or the root of the second sheet are connected to the hub, and the top sheet connects an end of the first sheet away from the hub with an end of the second sheet away from the hub; the hollow area is formed by the blade itself or by the blade and the hub together; Alternatively, the fan blade also includes a separating ring arranged around the periphery of the hub, and the blade body includes a first sheet and a second sheet arranged on both sides of the hollow area along the rotation direction of the fan blade, the root of the first sheet and / or the root of the second sheet are connected to the separating ring, and the top sheet connects the end of the first sheet away from the separating ring with the end of the second sheet away from the separating ring; the hollow area is formed by the blade itself or by the blade and the separating ring.
4. The fan blade according to claim 3, characterized in that: The first sheet body has a first air induction surface and a first air induction back surface disposed opposite to each other, and the second sheet body has a second air induction surface and a second air induction back surface disposed opposite to each other, and in the rotation direction of the fan blade, the first air induction surface is located in front of the second air induction surface; The top sheet body has a first preset spatial twisting structure, so that the first air induction surface is connected to the second air induction back surface via the outer top surface of the top sheet body, and the first air induction back surface is connected to the second air induction surface via the inner top surface of the top sheet body; Alternatively, the top sheet presents a second preset spatial twisting structure, so that the first air induction surface is connected to the second air induction back surface via the inner top surface of the top sheet, and the first air induction back surface is connected to the second air induction surface via the outer top surface of the top sheet.
5. The fan blade according to claim 4, characterized in that: In the axial projection view of the fan blade, a second virtual line with a radius of R2 is constructed with the center of the hub as the center of the circle, wherein R2 is smaller than R1; the first sheet body forms the first wind-inducing surface and the first wind-inducing back surface at least in the portion located between the first virtual line and the second virtual line; the second sheet body forms the second wind-inducing surface and the second wind-inducing back surface at least in the portion located between the first virtual line and the second virtual line, and the distance between the first virtual line and the second virtual line in the radial direction of the fan blade is d2; and 0<d2<0.1d0 is satisfied.
6. The fan blade according to claim 3, characterized in that: The root of the first sheet and the root of the second sheet are both connected to the wheel hub, and a gap is formed between the root of the first sheet and the root of the second sheet in the circumferential and / or axial direction of the wheel hub. The first sheet, the top sheet, the second sheet, and the wheel hub are jointly arranged to form the hollow area.
7. The fan blade according to any one of claims 1 to 6, characterized in that: In the axial projection view of the fan blade, the minimum distance between the edge of the hollow area and the outermost side of the blade is e, and the maximum thickness of the top sheet is f, wherein e=f.
8. A fan blade forming mold, used for forming the fan blade according to any one of claims 1 to 7, characterized in that: The fan blade molding mold includes a first mold core and a second mold core, the first mold core is used to mold the first inner top surface, and the second mold core is used to mold the second inner top surface. The first mold core can be demolded from the hollow area along the parting line toward one end of the hub, and the second mold core can be demolded from the hollow area along the parting line toward the other end of the hub.
9. A fan, characterized in that: It comprises a fan blade and a driving member drivingly connected to the fan blade, wherein the driving member is used to drive the fan blade to rotate, and the fan blade is the fan blade as described in any one of claims 1 to 7.
10. A blowing device, characterized in that: It comprises the fan blade according to any one of claims 1 to 7 or the fan according to claim 9.