Composite blade

Abstract

The utility model belongs to the technical field of ceiling fans, and particularly relates to a composite blade which comprises a blade body with an arc-shaped cavity, a through hole for a rod portion of a bolt to penetrate through is formed in the blade body in a penetrating mode, a rectangular block is arranged in the arc-shaped cavity, the length of the rectangular block is 0.2-0.8 time that of the blade body, and the length of the rectangular block is 0.2-0.8 time that of the blade body. A rectangular cavity for inserting the connecting block is formed in the rectangular block, mounting holes matched with the through holes in position and number are formed in the rectangular block in a penetrating mode, upper supporting strips for supporting the blade body are arranged on the upper surface of the rectangular block, and lower supporting strips for supporting the blade body are arranged on the lower surface of the rectangular block. The blade can effectively support the blade body and further effectively prevent the blade body from drooping and deforming due to self weight, and is long in service life and good in safety performance.

Description

A composite blade Technical Fields

[0001] This utility model belongs to the field of ceiling fan technology, and specifically refers to a composite blade. Background Technology:

[0002] Chinese utility model patent (publication number CN217427885U, application date 2022.06.01, publication date 2022.09.13) discloses an external rotor industrial ceiling fan motor structure, including a motor body, an upper cover, and a lower cover. The motor body is an external rotor motor. The upper and lower covers are respectively fixed to the upper and lower ends of the rotor of the motor body. Each edge of the upper and lower covers is provided with a mounting step, and screws are vertically inserted along the circumference of the mounting step to fix it to the rotor end face on the motor body. The upper surface of the upper cover has radially distributed positioning grooves at even intervals. The interior of the upper cover has an integral structure with reinforcing ribs corresponding to the positioning grooves. Each positioning groove has at least two through holes axially opened, and these through holes also pass through the reinforcing ribs. Each through hole has a bolt inserted from the inside to the outside, and a connecting block is fixed to it by a nut and bolt. The end of the connecting block is engaged in the positioning groove. One end of the connecting block extends outside the positioning groove and is fitted with blades, which are hollow in structure.

[0003] The shortcomings of the aforementioned industrial ceiling fans are: the blades of industrial ceiling fans are usually 2-4 meters long, forming a long cantilever structure. Furthermore, due to the hollow structure of the blades, under long-term rotational load, the blades are prone to sagging, deformation, or even breakage due to their own weight, affecting service life and safety performance. Invention content and utility model content:

[0004] The purpose of this invention is to provide a composite blade that can effectively support the blade body, thereby effectively preventing the blade body from sagging and deforming due to its own weight, and has a long service life and good safety performance.

[0005] This utility model is implemented as follows:

[0006] A composite blade includes a blade body with an arc-shaped cavity, a through hole through which a bolt shank passes, a rectangular block inside the arc-shaped cavity, the length of the rectangular block being 0.2-0.8 times the length of the blade body, a rectangular cavity inside the rectangular block for inserting a connecting block, and mounting holes through the rectangular block in a position and number adapted to the through hole, the upper surface of the rectangular block having an upper support strip for supporting the blade body, and the lower surface having a lower support strip for supporting the blade body.

[0007] In the aforementioned composite blade, multiple upper support bars are provided at intervals, with two upper support bars located at the left and right ends of the rectangular block, respectively; and one lower support bar is provided, located at the left end of the rectangular block.

[0008] In one of the composite blades described above, the width of the two upper support bars located at the ends of the rectangular block is smaller than the width of the remaining upper support bars.

[0009] In one of the composite blades described above, the arc-shaped cavity is provided with two reinforcing ribs, which divide the arc-shaped cavity into three chambers, and the rectangular block is disposed in the middle chamber.

[0010] In the aforementioned composite blade, the rectangular cavity extends through the length of the rectangular block, and the lengths of the upper and lower support bars are equal to the length of the rectangular block, with their front and rear end faces flush.

[0011] In the aforementioned composite blade, the rectangular block is made of the same material as the blade body, and both are composite glass fiber.

[0012] In the aforementioned composite blade, the upper support strip, the lower support strip, and the rectangular block are an integral structure.

[0013] In one of the composite blades described above, the length of the rectangular block is 0.23-0.4 times the length of the blade body.

[0014] In one of the composite blades described above, two through holes are provided along the length of the blade body.

[0015] The outstanding advantages of this utility model compared to the prior art are:

[0016] This invention features a rectangular block within the arc-shaped cavity of the blade body, with the length of the rectangular block being 0.2-0.8 times the length of the blade body. This effectively supports the blade body, preventing it from sagging and deforming due to its own weight, resulting in a long service life and good safety performance. Furthermore, the upper and lower surfaces of the rectangular block are equipped with upper and lower support strips to support the blade body, minimizing the volume and weight of the rectangular block while effectively ensuring the bending strength of both the rectangular block and the blade body. Simultaneously, the rectangular block is fixed to the blade body using existing bolts, ensuring a stable and reliable installation within the blade body, effectively guaranteeing the bending strength of the blade body without adding unnecessary installation structures. Figure description:

[0017] Figure 1 is a perspective view of this utility model;

[0018] Figure 2 is a perspective view of the blade body of this utility model;

[0019] Figure 3 is a perspective view of the rectangular block of this utility model.

[0020] Reference numerals: 1. Arc-shaped cavity; 2. Blade body; 3. Through hole; 4. Rectangular block; 5. Rectangular cavity; 6. Mounting hole; 7. Upper support bar; 8. Lower support bar; 9. Reinforcing rib. Detailed implementation method:

[0021] The present invention will be further described below with reference to specific embodiments, see Figures 1-3:

[0022] A composite blade includes a blade body 2 with an arc-shaped cavity 1. The blade body 2 has a through hole 3 through which a bolt rod passes. A rectangular block 4 is provided inside the arc-shaped cavity 1. The length of the rectangular block 4 is 0.2-0.8 times the length of the blade body 2. The rectangular block 4 has a rectangular cavity 5 for inserting a connecting block. The rectangular block 4 has mounting holes 6 through which the position and number of the holes are adapted to the through hole 3. The upper surface of the rectangular block 4 has an upper support bar 7 for supporting the blade body 2, and the lower surface has a lower support bar 8 for supporting the blade body 2.

[0023] In this embodiment, the length direction of the blade body 1 is the front-to-back direction.

[0024] The installation process of this utility model is as follows: As shown in Figures 1-3, the rectangular block 4 is inserted into the arc-shaped cavity 1 of the blade body 2. Then, the composite blade of this utility model is fitted onto the connecting block. Finally, the shank of the bolt passes through the upper half of the blade body 2, the upper half of the rectangular block 4, the connecting block, the lower half of the rectangular block 3, and the lower half of the blade body 2 in sequence before being screwed onto the nut.

[0025] As shown in Figures 1-3, this invention features a rectangular block 4 within the arc-shaped cavity 1 of the blade body 2. The length of the rectangular block 4 is 0.2-0.8 times the length of the blade body 2, effectively supporting the blade body 2 and preventing it from sagging and deforming due to its own weight. This design results in a long service life and good safety performance. Furthermore, the upper and lower surfaces of the rectangular block 4 are provided with upper support bars 7 and lower support bars 8 to support the blade body 2. This design minimizes the volume and weight of the rectangular block 4 while effectively ensuring the bending strength of both the rectangular block 4 and the blade body 2. Additionally, the rectangular block 4 is fixed to the blade body 2 using existing bolts, ensuring a stable and reliable installation within the blade body 2 and effectively guaranteeing its bending strength without adding unnecessary installation structures.

[0026] To better support the blade body 2, as shown in Figures 1 and 3, multiple upper support bars 7 are provided at intervals, with two of them located at the left and right ends of the rectangular block 4, respectively; one lower support bar 8 is provided, located at the left end of the rectangular block 4. In this embodiment, four upper support bars 7 are provided.

[0027] Furthermore, the width of the two upper support bars 7 located at the ends of the rectangular block 4 is smaller than the width of the remaining upper support bars 7. In this embodiment, the width of the two upper support bars 7 located at the ends of the rectangular block 4 is 5.5 mm, and the width of the remaining upper support bars 7 is 7 mm.

[0028] The structure of the blade body 2 is as shown in Figures 1 and 2. The arc-shaped cavity 1 is provided with two reinforcing ribs 9, which divide the arc-shaped cavity 1 into three chambers. The rectangular block 4 is located in the middle chamber.

[0029] To facilitate processing and better support the blade body 2, the rectangular cavity 5 extends through the length of the rectangular block 4, and the lengths of the upper support bar 7 and the lower support bar 8 are equal to the length of the rectangular block 4, with their front and rear end faces flush.

[0030] Furthermore, the rectangular block 4 is made of the same material as the blade body 2, and both are composite glass fiber.

[0031] Preferably, the upper support bar 7, the lower support bar 8, and the rectangular block 4 are an integral structure.

[0032] Preferably, the length of the rectangular block 4 is 0.23-0.4 times the length of the blade body 2. In this embodiment, the length of the blade body 2 is 2550 mm, and the length of the rectangular block 4 is 600 mm.

[0033] Furthermore, two through holes 3 are provided along the length direction of the blade body 2.

[0034] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A composite blade, comprising a blade body (2) having an arcuate cavity (1), wherein the blade body (2) has a through hole (3) through which a bolt shank passes, characterized in that: The arc-shaped cavity (1) is provided with a rectangular block (4). The length of the rectangular block (4) is 0.2-0.8 times the length of the blade body (2). The rectangular block (4) is provided with a rectangular cavity (5) for inserting the connecting block. The rectangular block (4) is provided with mounting holes (6) whose positions and numbers are adapted to the through holes (3). The upper surface of the rectangular block (4) is provided with an upper support strip (7) for supporting the blade body (2), and the lower surface is provided with a lower support strip (8) for supporting the blade body (2).

2. The composite blade according to claim 1, characterized in that: The upper support bar (7) is provided with multiple bars at intervals, and two of the upper support bars (7) are located at the ends of the left and right ends of the rectangular block (4); the lower support bar (8) is provided with one bar, and is located at the left end of the rectangular block (4).

3. A composite blade according to claim 2, characterized in that: The width of the two upper support bars (7) located at the ends of the rectangular block (4) is smaller than the width of the other upper support bars (7).

4. A composite blade according to claim 1, characterized in that: The arc-shaped cavity (1) is provided with two reinforcing ribs (9), which divide the arc-shaped cavity (1) into three chambers. The rectangular block (4) is located in the middle chamber.

5. A composite blade according to claim 1, characterized in that: The rectangular cavity (5) extends through the length of the rectangular block (4), and the lengths of the upper support strip (7) and the lower support strip (8) are equal to the length of the rectangular block (4), and the front and rear end faces are flush.

6. A composite blade according to claim 1, characterized in that: The rectangular block (4) is made of the same material as the blade body (2), and both are composite glass fiber.

7. A composite blade according to claim 1, characterized in that: The upper support bar (7), the lower support bar (8), and the rectangular block (4) are an integral structure.

8. A composite blade according to claim 1, characterized in that: The length of the rectangular block (4) is 0.23-0.4 times the length of the blade body (2).

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