Multi-layer composite fan blade

Abstract

The utility model relates to the technical field of electric appliances, and discloses a multi-layer composite fan blade which comprises a core plate, middle plates and face plates, the middle plates and the face plates are sequentially and symmetrically arranged on the two sides of the core plate, the core plate is an eucalyptus core plate, the middle plates are technical wood middle plates, and any two adjacent layers of plates are connected in a bonding mode through environment-friendly adhesive. Compared with the prior art, the multi-layer composite fan blade is formed by arranging the technical wood middle plates on the two sides of the eucalyptus core plate, the blade can be effectively prevented from drooping, twisting and deforming, the service life is prolonged, and the using process is safer.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical appliances, in particular to a multi-layer composite fan blade. Background Art

[0002] With the trend of global warming and environmental protection and energy conservation, more and more families choose to install ceiling fans to cooperate with air conditioners to reduce energy consumption. Ceiling fans are beneficial to indoor air circulation and are very good for human comfort.

[0003] The fan blade is a key component in the ceiling fan, and its performance directly affects the working efficiency, service life and decorative effect of the ceiling fan. There are mainly two categories of existing decorative ceiling fan blades on the market: eucalyptus multi-layer board ceiling fan blades and fiberboard ceiling fan blades. Decorative ceiling fan blades require a flat surface for finishing, and the fan blades should be stable during long-term hoisting operation without bending, deforming or cracking. However, eucalyptus multi-layer ceiling fan blades have many surface defects, rough textures, and poor paint finishing effects, often not meeting the customer's requirements for the flatness and smoothness of the fan blade surface. At the same time, when using eucalyptus as the material to produce ceiling fan blades, only the parts without tree knots, insect holes and burrs can be selected for use, resulting in large material losses and high production costs; although fiberboard fan blades can meet the customer's requirements for the flatness of the fan blade surface, they do not have high strength and toughness, and are difficult to withstand the stress brought by high-speed rotation. At the same time, fiberboard fan blades are prone to moisture absorption, deformation and sagging, and their durability is insufficient. Therefore, fiberboard fan blades can only be used for small-sized ceiling fans (generally less than 48 inches) with low requirements for fan blade deformation or engineering building fans, etc. Fiberboard fan blades are also heavier than eucalyptus multi-layer board fan blades, resulting in more energy consumption for the entire ceiling fan. Summary of the Utility Model

[0004] To solve the above technical problems, the purpose of the utility model is to provide a multi-layer composite fan blade, which forms a multi-layer composite fan blade by setting science and technology wood middle plates on both sides of the eucalyptus core board, can effectively prevent the blade from sagging, twisting and deforming, extends the service life, and is safer during use.

[0005] Based on this, the utility model provides a multi-layer composite fan blade, including a core board, a middle board and a panel. The middle board and the panel are symmetrically arranged on both sides of the core board in sequence. The core board is an eucalyptus core board, the middle board is a science and technology wood middle board, and any two adjacent layers of boards are adhesively connected by an environment-friendly adhesive.

[0006] In some embodiments of the present application, the core board is made by rotary cutting of logs.

[0007] In some embodiments of the present application, the thickness of the core board is 1.5 - 4 mm.

[0008] In some embodiments of the present application, the thickness of the middle board is 1.5 - 3 mm.

[0009] In some embodiments of the present application, the panel is a rock sugar fruit wood panel, a mahogany panel, or a technology wood panel.

[0010] In some embodiments of the present application, the thickness of the panel is 0.2 - 0.6 mm.

[0011] Compared with the prior art, the multi-layer composite fan blade provided by the embodiments of the present utility model has the following beneficial effects:

[0012] In the present application, an eucalyptus wood is used as the core board, and technology wood core boards are arranged on both sides of the core board to form a multi-layer fan blade structure. The physical properties such as density and static bending strength of the technology wood are superior to those of natural wood. It is anti-corrosion, anti-moth, moisture-resistant and easy to process, meeting the requirements for the structural stability of the fan blade. At the same time, the technology wood has no natural defects inherent in natural wood such as wormholes, knots, and color changes. After sanding and then veneering, the panel has a high flatness, is smooth and flawless, overcoming the limitations of the natural wood core and meeting the requirements for the surface flatness of the fan blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram of a multi-layer composite fan blade according to some embodiments of the present utility model;

[0014] Figure 2 is a schematic cross-sectional view of a multi-layer composite fan blade according to some embodiments of the present utility model.

[0015] In the figure, 1 is the core board; 2 is the middle board; 3 is the panel. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0017] It should be understood that in the present utility model, terms such as "front" and "rear" are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, "front" information can also be referred to as "rear" information, and "rear" information can also be referred to as "front" information.

[0018] As Figure 1 and Figure 2 shown, the present utility model provides a multi-layer composite fan blade, including a core board 1, a middle board 2, and a panel 3. The middle board 2 and the panel 3 are symmetrically arranged on both sides of the core board 1 in sequence. The core board 1 is an eucalyptus wood core board 1, the middle board 2 is a technology wood middle board 2, and any two adjacent layers of boards are adhesively connected by an environmentally friendly adhesive.

[0019] Based on the above structure, in this application, eucalyptus wood is used as the core board 1, and veneered wood core boards 1 are arranged on both sides of the core board 1 to form a multi-layered blade structure. The physical properties such as density and static bending strength of veneered wood are superior to those of natural wood. It is corrosion-resistant, moth-proof, moisture-resistant and easy to process, meeting the requirements of the blade for structural stability. At the same time, veneered wood has no natural defects inherent in natural wood such as wormholes, knots, and color changes. After sanding and then pasting the veneer panel 3, it has high flatness, is smooth and flawless, overcoming the limitations of the natural wood core and meeting the requirements of the blade for surface flatness; further, this application reduces the processes such as puttying and sanding of the ceiling fan blades, greatly improving the production efficiency, reducing the production cost, reducing the material loss, and enabling the production of large-sized blades.

[0020] Specifically, the core board 1 is made by rotary cutting of logs, and its thickness is 1.5 - 4 mm.

[0021] Further, the thickness of the veneered wood middle board 2 is 1.5 - 3 mm, and the preparation method is as follows:

[0022] S1. Rotary cut the logs into thin wood with a thickness of 1 - 8.00 mm;

[0023] S2. Use the bleaching liquid to bleach and soften the prepared thin wood. The bleaching time is 3 - 8 h, and the bleaching temperature is 25 - 85 °C. Among them, the bleaching liquid contains 10 - 25% hydrogen peroxide, 1 - 5% calcium silicate or sodium silicate, 3 - 5% sodium hydroxide or potassium hydroxide, and the rest is water;

[0024] S3. Dry the bleached thin wood, and the moisture content of the dried thin wood is 8 - 14%;

[0025] S4. Use melamine-modified urea-formaldehyde resin glue to apply glue, assemble the blanks and cold press and cure the dried thin wood to form veneered wood blocks;

[0026] S5. Plane cut the veneered wood blocks in a direction perpendicular to the lamination into veneered wood middle boards 2 with a thickness of 1.5 - 3 mm.

[0027] Even further, the panel 3 is made of rock sugar fruit wood or mahogany or veneered wood panel 3, and the thickness of the panel 3 is 0.2 - 0.6 mm.

[0028] The performance test comparison between the multi-layer composite blade of the present utility model and the conventional blades on the market is shown in the following table.

[0029]

[0030] In summary, the present utility model provides a multi-layer composite fan blade, which includes a core board, a middle board and a panel. The middle board and the panel are symmetrically arranged on both sides of the core board in sequence. The core board is an eucalyptus core board, and the middle board is a science and technology wood middle board. Any two adjacent layers of boards are adhesively connected through an environment-friendly adhesive. Compared with the prior art, the multi-layer composite fan blade forms a multi-layer composite fan blade by arranging science and technology wood middle boards on both sides of the eucalyptus core board, which can effectively prevent the blade from sagging, twisting and deforming, extend the service life, and make the use process safer.

[0031] The above description is only a preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A multi-layer composite fan blade, characterized in that, It includes a core board (1), a middle board (2) and a face board (3). The middle board (2) and the face board (3) are symmetrically arranged on both sides of the core board (1) in sequence. The core board (1) is an eucalyptus core board (1), and the middle board (2) is a science and technology wood middle board (2). Any two adjacent layers of boards are adhesively connected by an environmentally friendly adhesive.

2. The multi-layer composite fan blade according to claim 1, wherein The core board (1) is made by rotary cutting of logs.

3. The multi-layer composite fan blade according to claim 1, wherein, The thickness of the core board (1) is 1.5 - 4 mm.

4. The multi-layer composite fan blade according to claim 1, wherein The thickness of the middle board (2) is 1.5 - 3 mm.

5. The multi-layer composite fan blade according to claim 1, wherein, The face board (3) is a rock sugar fruit wood or mahogany or science and technology wood face board (3).

6. The multi-layer composite fan blade according to claim 1, wherein The thickness of the face board (3) is 0.2 - 0.6 mm.

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