Double-layer fan with weight reduction notches

Abstract

The double-layer fan comprises a motor provided with a rotating shaft, a fan blade assembly arranged on the rotating shaft in a penetrating mode and an end cover matched with the tail end of the rotating shaft, the fan blade assembly comprises a wheel rim arranged on the rotating shaft in a penetrating mode and first blades arranged on the periphery of the wheel rim, the end cover is further provided with second blades, a center shaft sleeve is further arranged in the wheel rim, and the center shaft sleeve is sleeved with the rotating shaft. A weight reduction notch is further formed in the center shaft sleeve. The air supply device has the advantages of strong wind power in the central area, simple structure, large air supply force, high mechanical strength and higher durability.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric fan especially relates to a double -deck fan with weight -reducing gap. BACKGROUND

[0002] At present, the electric fan on the market still mainly is single -deck fan blade, although the subsequent single -deck fan blade changes multiple fan blade shapes, for example, in patent CN219570411U, CN202360455U, CN203189324U, CN209261911U, the top of the blade set up on the wheel rim is also provided with an intermediate ring, and then another circle of blades is expanded out on the intermediate ring, but the aforementioned fan blade shape still cannot solve the problems such as the lack of wind force in the center area of the fan blade corresponding to the wheel rim, and the small air supply strength.

[0003] Therefore, individual manufacturers begin to consider increasing the number of blades along the axial direction of the fan blade, so as to generate airflow at different distances to make up for the lack of wind force in the center area of the fan blade, for example, the Chinese utility model patent with the authorization announcement number CN214330980U and the title of a double -deck blade structure fan blade discloses that: including: the body, the body front end is provided with a plurality of front layer blades, and the body rear end is provided with a plurality of rear layer blades, the front layer blade and the rear layer blade are cross arranged, the diameter ratio between the outermost end edge track circle of the front layer blade and the outermost end edge track circle of the rear layer blade is 51:79, the motor shaft mounting part is arranged in the body, the D-shaped gap is arranged at the front end of the motor shaft mounting part, and the U-shaped notch is arranged at the rear end of the motor shaft mounting part. The technical scheme disclosed by the utility model, since the front layer blade and the rear layer blade are arranged on the body 1, although the blades are cross arranged and there is a size difference between the outermost end edge track circles, but the problem of lack of wind force in the center area corresponding to the body 1 cannot be completely solved, and moreover, the heavy body structure leads to insufficient air supply strength.

[0004] For example, the authorized announcement number for CN208888750U, entitled "Adjustable double-layer fan computer case fan", discloses: including the first fan body and the second fan body connected with the first fan body, the first fan body includes a first hub and a plurality of first fan blades connected with the first hub, the second fan body includes a second hub and a plurality of second fan blades connected with the first hub, the first hub and the second hub are detachably connected, the inner side of the first hub is provided with an adjusting bolt and a plurality of clamping blocks, the outer side of the second hub is provided with a plurality of adjusting grooves matched with the adjusting bolt and a plurality of connecting through holes matched with the clamping blocks. The technical solution of the utility model, by adjusting the misalignment angle between the second fan blade and the first fan blade to adjust the air supply effect, cannot completely compensate for the lack of wind power in the center area corresponding to the hub, and the added detachable structure also leads to the increase of the weight of the hub, and the air supply force is also significantly weakened. The above attempts cannot solve the problem of lack of wind power in the center area from the root, and the effect of the solution is not ideal.

[0005] To further overcome the problem of lack of wind power in the center area of the single-layer fan blade, a few manufacturers use a stacked fan blade structure to solve the problem from the root. For example, the authorized announcement number for CN221442905U, entitled "Upper fan head dismounting structure", discloses: including a fan cover and a main fan blade arranged inside the fan cover, a base plate and a soft wind head are arranged at the middle position of the front side of the fan cover, the soft wind head includes a mounting seat, soft wind blades and a mesh cover, the base plate is fixed at the middle position of the front side of the fan cover, the mesh cover is connected with the mounting seat to form a fan blade cavity, the soft wind blades are located in the fan blade cavity and are rotationally connected with the mounting seat, the mounting seat is mounted on the base plate through a screw buckle structure, the mounting seat and the base plate are provided with ventilation structures, the forward blowing wind generated by the rotation of the main fan blade can pass through the ventilation structures to blow the soft wind blades and drive them to rotate. The technical solution of the utility model, on the one hand, isolates the stacked fan blades by separately arranging a fan blade cavity, which is complex in structure and cumbersome to disassemble and assemble; on the other hand, only the wind blowing to the soft wind blades by the rotation of the main fan blade can drive them to rotate, which cannot fundamentally solve the problem of lack of wind power in the center area.

[0006] For example, the authorized announcement number for CN205172998U, entitled "Double-wing multi-layer fan blade electric fan", discloses: including a motor, at least one set of fan blades arranged on the rotating shaft of the motor and a locking nut arranged on the rotating shaft of the motor, the fan blades include a fan ring and a plurality of first blades arranged on the fan ring, and the locking nut is provided with a plurality of second blades. The technical solution of the utility model, although a stacked fan blade structure is used to compensate for the lack of wind power in the center area, it still cannot further improve the air supply force. Utility model content

[0007] The utility model provides a double -deck fan with weight -reducing gap which has strong wind force in the central area, simple structure, large air -supply strength, high mechanical strength and better durability.

[0008] The utility model provides a double -deck fan with weight -reduducing gap, including the motor with pivot, the fan blade subassembly of wearing in pivot and the end cover with the end of pivot cooperation, the fan blade subassembly includes the rim of wearing in pivot and the first blade of being located the rim periphery, the end cover still is equipped with the second blade, the rim still is equipped with the center shaft sleeve in, the center shaft sleeve still forms weight -reducing gap on.

[0009] Wherein, the weight -reducing gap can be arranged on the end side wall of the center shaft sleeve; The rim can be provided with a closed end face away from the positioning pin, and the closed end face can be provided with a sunken platform; The rim can be further provided with a reinforcing cylinder, and the rim can be connected with the center shaft sleeve through the reinforcing cylinder; The rim can further include a connecting rib plate and a connecting shaft surface, and the reinforcing cylinder can be connected with the center shaft sleeve through the connecting rib plate and the connecting shaft surface; The pivot can be provided with a positioning pin, and the end side wall of the center shaft sleeve is provided with a positioning groove for accommodating the positioning pin; The end cover can further include a locking shaft sleeve, an inner thread is arranged on the inner wall surface of the locking shaft sleeve, an outer thread is arranged on the outer wall surface of the end of the pivot, and the inner thread and the outer thread are matched to connect the end cover with the pivot; The end cover can further include a connecting plate, and the connecting plate is arranged on the outer periphery of the locking shaft sleeve; The size of the first blade can be larger than the size of the second blade, and the ratio of the length of the first blade to the length of the second blade can be between 1.25 and 1.75; The root width of the first blade can be smaller than the top width of the first blade, and / or the root width of the second blade can be smaller than the top width of the second blade.

[0010] According to the technical scheme of the utility model, the following beneficial effects are achieved: the fan blades and the end cover are arranged on the pivot, which is simple in structure and convenient to disassemble and maintain; The stacking effect between the first blade on the fan blade and the second blade on the end cover can effectively solve the problem of lack of wind force in the central area; The end side wall of the center shaft sleeve adjacent to the positioning groove is formed with a weight -reducing gap, which further reduces the weight of the fan blade, thereby providing conditions for improving the air -supply strength. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The partial structure of the electric fan of the present application is shown in the exploded view.

[0012] Figure 2 is Figure 1 The enlarged view of part A.

[0013] Figure 3 It is the structure schematic diagram of the back view of the fan blade.

[0014] Figure 4 It is the structure schematic diagram of the back view of the fan blade. Figure 3 It is the enlarged view of the middle B part.

[0015] Figure 5 It is the structure schematic diagram of the side view of the fan blade.

[0016] Figure 6 It is the structure schematic diagram of the side view of the fan blade. Figure 5 It is the enlarged view of the middle C part.

[0017] Figure 7 It is the structure schematic diagram of the side view of the fan blade.

[0018] Figure 8 It is the structure schematic diagram of the side view of the fan blade. Figure 7 It is the enlarged view of the middle D part.

[0019] Figure 9 It is the structure schematic diagram of the front view of the fan blade.

[0020] Figure 10 It is the back side view of the end cover.

[0021] Figure 11 It is the back side view of the end cover. Figure 9 It is the sectional view of E-E.

[0022] 1 motor, 11 rotating shaft, 111 positioning pin, 2 fan blade, 21 wheel rim, 211 center shaft sleeve, 2110 positioning groove, 212 reinforcing cylinder, 213 reinforcing web, 22 first blade, 3 end cover, 31 second blade, 32 locking shaft sleeve, 33 connecting plate, K weight-reducing notch, M closed end face, T sink, X connecting rib plate, Y connecting shaft surface. DETAILED DESCRIPTION

[0023] The technical scheme of the utility model is further described below in combination with the drawings:

[0024] Referring to Figure 1 , 2The double-layer fan with weight-reducing notch shown in the drawings comprises a motor 1 provided with a rotating shaft 11, and a fan blade assembly arranged on the rotating shaft 11. The fan blade assembly can comprise at least one layer of fan blades 2 and an end cover 3 matched with the end of the rotating shaft 11. The fan blade assembly further comprises a rim 21 arranged on the rotating shaft 11, and the outer periphery of the rim 21 is provided with first blades 22. The end cover 3 is further provided with second blades 31. The rim 21 is further provided with a central shaft sleeve 211 sleeved on the rotating shaft 11. The rotating shaft 11 is provided with a positioning pin 111, and the end side wall of the central shaft sleeve 211 is provided with a positioning groove 2110 for the positioning pin 111. A weight-reducing notch K is formed on the end side wall of the central shaft sleeve 211 close to the positioning groove 2110. The weight-reducing notch K makes the side wall of the central shaft sleeve 211 form a non-complete cylindrical shape, so as to reduce the weight of the central shaft sleeve as much as possible. The weight-reducing notch K can be formed on the end of the side wall of the central shaft sleeve or on the body of the central shaft sleeve. In the drawings, the weight-reducing notch K is formed on the end of the side wall of the central shaft sleeve, so that the end of the side wall of the central shaft sleeve has a notch instead of a complete cylindrical surface.

[0025] In the application, the fan blades and the end cover are arranged on the rotating shaft, so that the electric fan has a simple structure and is convenient to disassemble, maintain and repair. In the application, the overlapping effect between the first blades on the fan blades and the second blades on the end cover can well solve the problem of wind power loss in the central area. In the application, the end side wall of the central shaft sleeve close to the positioning groove is formed with a weight-reducing notch, which further reduces the weight of the fan blades, thereby providing a condition for improving the air supply strength.

[0026] Referring to Figures 3-8 As shown in the drawings, the weight-reducing notch K can be at least one of an arc surface triangular shape, an arc surface rectangular shape and an arc surface trapezoidal shape. Preferably, the weight-reducing notch K is in an arc surface triangular shape.

[0027] Referring to Figure 1 , 9 As shown in the drawings, the rim 21 is further provided with a closed end face M at the end away from the positioning pin 111, and the closed end face M is provided with a sunken platform T. In the application, the closed end face is arranged on the rim to connect and enhance the mechanical strength. The sunken platform arranged on the closed end face further improves the mechanical strength of the rim through its "stepped structure", so that the fan blades are more durable, the service life of the product is improved, and the sunken platform also limits the end cover, so that the structure is more stable.

[0028] Referring to Figures 3-6 As shown in the drawings, the rim 21 is further provided with a reinforcing cylinder 212, and the rim 21 is connected with the central shaft sleeve 211 through the reinforcing cylinder 212. The rim 21 is further provided with reinforcing spokes 213 extending outward in the radial direction from the outer periphery of the reinforcing cylinder 212. In the application, the arrangement of the reinforcing cylinder and the reinforcing spokes further enhances the mechanical strength of the rim.

[0029] Referring to Figures 3-6 As shown in FIG. 9, the rim 21 is further provided with at least one of a connecting rib plate X and a connecting shaft surface Y, and the reinforcing cylinder 212 is connected with the central shaft sleeve 211 through the connecting rib plate X and the connecting shaft surface Y. In the present application, the reinforcing cylinder is connected with the central shaft sleeve through the connecting rib plate and the connecting shaft surface, which further improves the connecting strength with the central shaft sleeve, and makes the structure more stable and avoids the fan blade from shaking during rotation.

[0030] Referring to Figure 10 As shown in FIG. 9, the rim 21 is further provided with at least one of a connecting rib plate X and a connecting shaft surface Y, and the reinforcing cylinder 212 is connected with the central shaft sleeve 211 through the connecting rib plate X and the connecting shaft surface Y. In the present application, the reinforcing cylinder is connected with the central shaft sleeve through the connecting rib plate and the connecting shaft surface, which further improves the connecting strength with the central shaft sleeve, and makes the structure more stable and avoids the fan blade from shaking during rotation.

[0031] As shown in FIG. 9, the rim 21 is further provided with at least one of a connecting rib plate X and a connecting shaft surface Y, and the reinforcing cylinder 212 is connected with the central shaft sleeve 211 through the connecting rib plate X and the connecting shaft surface Y. In the present application, the reinforcing cylinder is connected with the central shaft sleeve through the connecting rib plate and the connecting shaft surface, which further improves the connecting strength with the central shaft sleeve, and makes the structure more stable and avoids the fan blade from shaking during rotation. Figure 1 As shown in FIG. 9, the rim 21 is further provided with at least one of a connecting rib plate X and a connecting shaft surface Y, and the reinforcing cylinder 212 is connected with the central shaft sleeve 211 through the connecting rib plate X and the connecting shaft surface Y. In the present application, the reinforcing cylinder is connected with the central shaft sleeve through the connecting rib plate and the connecting shaft surface, which further improves the connecting strength with the central shaft sleeve, and makes the structure more stable and avoids the fan blade from shaking during rotation.

[0032] Although the specific embodiments of the present application have been described above, those skilled in the art can make modifications to the present application without departing from the spirit and principles of the present application, and the protection scope of the present application is defined by the claims and their equivalents.

Claims

1. A double-layer fan with a weight-reduction notch, comprising a motor with a rotating shaft, a fan blade assembly passing through the rotating shaft, and an end cap cooperating with the end of the rotating shaft, wherein the fan blade assembly includes a rim passing through the rotating shaft and a first blade disposed on the outer periphery of the rim, and the end cap further comprises a second blade, characterized in that: The wheel rim is further provided with a center shaft sleeve, and the center shaft sleeve is further provided with a weight-reducing gap.

2. The double layer fan with weight reduction notches according to claim 1, characterized in that: The weight-reducing gap is arranged on the end side wall of the center shaft sleeve.

3. The double layer fan with weight reduction notches according to claim 1, characterized in that: The wheel rim is further provided with a closed end face at the end away from the positioning pin, and the closed end face is provided with a sink.

4. Double fan provided with lightening cutouts according to any one of claims 1-3, characterized in that: The wheel rim is further provided with a reinforcing cylinder, and the wheel rim is connected with the center shaft sleeve through the reinforcing cylinder.

5. The double layer fan with weight reduction notches according to claim 4, characterized in that: The wheel rim further comprises a connecting rib plate and a connecting shaft face, and the reinforcing cylinder is connected with the center shaft sleeve through the connecting rib plate and the connecting shaft face.

6. The dual layer fan with weight reduction cutouts of claim 1, wherein: The rotating shaft is provided with a positioning pin, and the end side wall of the center shaft sleeve is provided with a positioning groove for accommodating the positioning pin.

7. The double layer fan with weight reduction cutouts according to any one of claims 1-3, 5-6, characterized in that: The end cover further comprises a locking shaft sleeve, and the inner wall surface of the locking shaft sleeve is provided with an internal thread.

8. The double layer fan with weight reduction notches according to claim 7, characterized in that: The end cover further comprises a connecting plate arranged on the outer periphery of the locking shaft sleeve.

9. The double layer fan with weight reduction cutouts according to any one of claims 1-3, 5-6, 8, characterized in that: The size of the first blade is greater than the size of the second blade, and the ratio of the length of the first blade to the length of the second blade is between 1.25 and 1.

75.

10. The double layer fan with weight reduction notches according to claim 9, characterized in that: The root width of the first blade is smaller than the top width of the first blade, and / or the root width of the second blade is smaller than the top width of the second blade.

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