A plastic-coated metal fan blade and its manufacturing method

Abstract

This invention discloses a plastic-coated metal fan blade and its manufacturing method, relating to the field of fan blade technology. It includes a bearing and a fan blade body. The bearing includes a hub, a bushing, and a connecting sleeve. The bushing is fixedly installed near the center of the hub. Three connecting sleeves are evenly distributed circumferentially on the outer surface of the hub, and the fan blade body is fixedly installed in each connecting sleeve. The fan blade body includes blades, connecting plates, and rectangular openings. Connecting plates are fixedly installed on the sides of the blades near the connecting sleeves. This invention uses injection molding to integrate the bearing and fan blade body, resulting in a stronger connection that is less prone to breakage and damage. It eliminates the assembly process, greatly improving work efficiency and reducing production costs. Simultaneously, the bearing has good insulation properties, effectively preventing motor leakage and reducing fan blade weight, thus reducing energy consumption. The metal blades have increased strength, are less prone to deformation, and can generate a uniform and stable airflow.

Description

Technical Field

[0001] This invention relates to the field of fan blade technology, specifically to a plastic-coated metal fan blade and its manufacturing method. Background Technology

[0002] Fan blades, a component of table fans and ceiling fans, are parts that rotate to generate airflow, driven by a motor. The width and angle of the fan blades are designed according to the motor's load power. If we disregard motor power and only consider a fixed rotation speed, the angle of the fan blades becomes even more important; if the blade angles are the same, a wider blade will naturally produce a stronger airflow. Furthermore, the design and manufacturing of fan blades typically feature a regular, symmetrical structure, which helps to produce a uniform and stable airflow.

[0003] In existing technologies, conventional fan blades are mostly made of all-metal welding or all-plastic injection molding. Welding all-metal fan blades is time-consuming and labor-intensive, with poor precision. During use, they are heavy, consume a lot of kinetic energy, and have poor insulation performance, which cannot effectively prevent motor leakage and poses a safety hazard. All-plastic injection molded fan blades have low rigidity and strength, and are prone to deformation and damage during long-term use. Deformation of the fan blades also reduces airflow. Traditionally, metal blades can be fixed to plastic shaft seats with locking bolts, but this consumes a lot of time in the assembly process. Furthermore, the fan blade assembly has low precision, the blades rotate unstably, production efficiency is low, and production costs are high. In addition, the installation is not secure, and the blades are prone to loosening, breakage, or falling off after long-term use, posing a safety hazard. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a plastic-coated metal fan blade and its manufacturing method, thereby resolving the problems mentioned in the background section.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a plastic-coated metal fan blade, comprising a bearing seat and a fan blade body. The bearing seat includes a hub, a bushing, and a connecting sleeve. The bushing is fixedly installed near the center of the hub, and the upper and lower sides of the bushing are open. Three connecting sleeves are evenly arranged circumferentially on the outer surface of the hub, and the fan blade body is fixedly installed in each connecting sleeve. The fan blade body includes a blade, a connecting plate, and a rectangular opening. The connecting plate is fixedly installed on the side of the blade near the connecting sleeve, and the connecting plate is fixedly installed in the connecting sleeve. Three rectangular openings are evenly formed on the connecting plate and in the connecting sleeve. A concave groove is provided on the upper surface of the blade, and a guide protrusion is formed on the lower surface of the blade corresponding to the concave groove.

[0006] To further optimize this technical solution, a reinforcing rib is fixedly installed in a rectangular shape between the inner wall of the hub and the outer surface of the bushing.

[0007] To further optimize this technical solution, a limiting groove is formed on the lower surface of the bushing.

[0008] To further optimize this technical solution, the hub, bushing, connecting sleeve, and reinforcing rib are injection molded as a single integrated structure.

[0009] To further optimize this technical solution, the blade and the connecting plate are integrally formed.

[0010] To further optimize this technical solution, both the upper and lower sides of the blade have an arc surface structure.

[0011] A method for producing a plastic-coated metal fan blade includes the following steps:

[0012] S1. Fan blade body manufacturing: Select the metal raw materials used for the fan blade body, press the metal into the required shape. During the metal pressing process, a stamping die can be used to put the metal into the die and press the metal into the required shape through high pressure. Then, the fan blade body is ground and polished by a grinding and polishing machine and cleaned.

[0013] S2. Mold pretreatment: Clean, preheat, and apply release agent to the mold parting surface of the injection mold. Clean the mold parting surface of the injection mold with a cleaning brush, then clean and preheat the injection mold with hot air, and then apply release agent with a brush.

[0014] S3. Place the fan blade body: Place the three fan blade bodies as needed into the cavity of the injection mold;

[0015] S4. Mold Closure and Injection: The injection mold is closed, and the raw material in the injection molding machine is injected into the cavity of the injection mold through the injection port, so that the injected raw material forms a shaft seat, and the injection molded shaft seat and the fan blade body are injection molded into a whole. The injection temperature is 200 degrees and the injection time is 30 seconds.

[0016] S5. Cooling and Demolding: After ventilating and cooling the injection mold, open the air outlet of the injection mold to open the mold. During the mold opening process, high-pressure air is introduced into the mold through the injection port until demolding is completed, resulting in a complete fan blade.

[0017] S6. Surface treatment: After injection molding, the burrs on the bearing seat are cleaned, and the fan blade body and bearing seat are sprayed with a spray nozzle to obtain a complete fan blade.

[0018] Beneficial effects

[0019] Compared with the prior art, the present invention provides a plastic-coated metal fan blade and a method for producing the same, which has the following advantages:

[0020] The plastic-coated metal fan blade and its manufacturing method feature a one-piece injection-molded shaft seat that is integrally molded with the fan blade body during the injection molding process. This results in a stronger connection between the two, making them less prone to breakage and damage. It eliminates the assembly process, significantly improving work efficiency and reducing production costs. The shaft seat also provides excellent insulation, effectively preventing motor leakage and reducing the overall weight of the fan blade, thus lowering energy consumption. The metal blades are strong and resistant to deformation during use, generating a uniform and stable airflow. Furthermore, the concave grooves and guide protrusions on the upper and lower sides of the blades increase airflow speed while minimizing noise. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of a plastic-coated metal fan blade proposed in this invention.

[0022] Figure 2 This is an exploded front view of a plastic-coated metal fan blade proposed in this invention.

[0023] Figure 3 This is a bottom view of a plastic-coated metal fan blade proposed in this invention.

[0024] Figure 4 This is an exploded bottom view of a plastic-coated metal fan blade proposed in this invention.

[0025] Figure 5 This is a schematic flowchart of a method for producing plastic-coated metal fan blades according to the present invention.

[0026] In the figure: 1. Shaft seat; 101. Hub; 102. Bushing; 103. Connecting sleeve; 2. Fan blade body; 201. Blade; 202. Connecting plate; 203. Rectangular opening; 3. Concave groove; 4. Guide protrusion; 5. Reinforcing rib; 6. Limiting groove. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please refer to Figures 1-5This invention discloses a plastic-coated metal fan blade, including a bearing seat 1 and a fan blade body 2. The bearing seat 1 includes a hub 101, a bushing 102 and a connecting sleeve 103. The bushing 102 is fixedly installed in the hub 101 near the center, and the upper and lower sides of the bushing 102 are open structures. Three connecting sleeves 103 are evenly arranged circumferentially on the outer surface of the hub 101, and the fan blade body 2 is fixedly installed in each connecting sleeve 103.

[0029] The fan blade body 2 includes a blade 201, a connecting plate 202, and a rectangular opening 203. The connecting plate 202 is fixedly installed on the side of the blade 201 near the connecting sleeve 103, and the connecting plate 202 is fixedly installed inside the connecting sleeve 103. Three rectangular openings 203 are evenly opened on the connecting plate 202 and inside the connecting sleeve 103. A concave groove 3 is provided on the upper surface of the blade 201, and a flow guiding protrusion 4 is formed on the lower surface of the blade 201 corresponding to the concave groove 3.

[0030] Specifically, a reinforcing rib 5 is fixedly installed in a rectangular shape between the inner wall of the hub 101 and the outer surface of the bushing 102.

[0031] In this embodiment, the reinforcing rib 5 makes the connection between the hub 101 and the bushing 102 stronger, and the bushing 102 is strong and not easily damaged.

[0032] Specifically, a limiting groove 6 is formed on the lower surface of the bushing 102.

[0033] In this embodiment, the limiting groove 6 limits the upper limit rod of the motor output shaft after the bushing 102 is installed, so that the bushing 102 is firmly installed and will not rotate on the motor output shaft.

[0034] Specifically, the hub 101, bushing 102, connecting sleeve 103 and reinforcing rib 5 are injection molded as a single unit.

[0035] In this embodiment, the bearing seat 1 formed by the hub 101, bushing 102, connecting sleeve 103 and reinforcing rib 5 has high structural strength, is not easily deformed or damaged, and has a long service life.

[0036] Specifically, the blade 201 and the connecting plate 202 are integrally formed.

[0037] In this embodiment, the fan blade body 2, composed of the blade 201 and the connecting plate 202, is strong, not easily deformed or damaged, and is conducive to long-term use.

[0038] Specifically, the upper and lower sides of the blade 201 are both arc-shaped.

[0039] In this implementation scheme, blade 201 can generate a more stable wind source.

[0040] A method for producing a plastic-coated metal fan blade includes the following steps:

[0041] S1. Fan blade body manufacturing: Select the metal raw materials used for the fan blade body 2, press the metal into the required shape. During the metal pressing process, a stamping die can be used to put the metal into the die and press the metal into the required shape through high pressure. Then, the fan blade body 2 is polished and cleaned by a grinding and polishing machine.

[0042] S2. Mold pretreatment: Clean, preheat, and apply release agent to the mold parting surface of the injection mold. Clean the mold parting surface of the injection mold with a cleaning brush, then clean and preheat the injection mold with hot air, and then apply release agent with a brush.

[0043] S3. Place the fan blade body: Place the three fan blade bodies 2 as needed into the cavity of the injection mold;

[0044] S4. Mold Closure and Injection: The injection mold is closed, and the raw material in the injection molding machine is injected into the cavity of the injection mold through the injection port, so that the injected raw material forms a shaft seat 1, and the injection molded shaft seat 1 and the fan blade body 2 are injection molded into a whole. The injection temperature is 200 degrees and the injection time is 30 seconds.

[0045] S5. Cooling and Demolding: After ventilating and cooling the injection mold, open the air outlet of the injection mold to open the mold. During the mold opening process, high-pressure air is introduced into the mold through the injection port until demolding is completed, resulting in a complete fan blade.

[0046] S6. Surface treatment: After injection molding, the burrs on the bearing seat 1 are cleaned, and the fan blade body 2 and bearing seat 1 are sprayed with a spray nozzle to obtain a complete fan blade.

[0047] Working principle: The metal raw material is formed into the shape of the fan blade body 2 by stamping. The outer surface of the fan blade body 2 is cleaned, and the injection mold is cleaned and preheated. Three fan blade bodies 2 are evenly placed in the cavity of the injection mold along the circumference, and the injection mold is closed. Plastic is injected into the cavity of the injection mold through the injection port. The injected plastic forms the structure of the bearing seat 1 in the cavity. The connecting sleeve 103 in the bearing seat 1 is sleeved on the connecting plate 202 on the fan blade body 2. At the same time, the connecting plate 202 has three rectangular openings 203, so that the injection-formed connecting sleeve 103 is injected into the rectangular openings 203 and connected, making the connection between the connecting sleeve 103 and the connecting plate 202 more secure. Then the injection mold is cooled and opened. At the same time, the ejector pin pushes the fan blade body 2 upward. After the fan blades are molded, they are removed, and the injection-molded bearing seat 1 is deburred. Depending on requirements, the outer surfaces of the fan blade body 2 and bearing seat 1 are sprayed. Because the bearing seat 1 is an integral injection-molded structure, and it is molded into a single unit with the fan blade body 2 during the injection molding process, the connection between the two is stronger, less prone to breakage or damage, eliminating the assembly process, greatly improving work efficiency, and reducing production costs. At the same time, the bearing seat 1 has good insulation properties, effectively preventing motor leakage and reducing the overall weight of the fan blade, thus reducing energy consumption. The metal blade 201 has high strength and is not easily deformed during use. The blade 201 can generate a uniform and stable airflow. Furthermore, the concave grooves 3 and guide protrusions 4 on the upper and lower sides of the blade 201 increase the wind speed and reduce noise.

[0048] The beneficial effects of this invention are: by injection molding, the bearing seat 1 and the fan blade body 2 are integrated, making the connection between the two more solid and less prone to breakage or damage, eliminating the assembly process, greatly improving work efficiency, and reducing production costs. At the same time, the bearing seat 1 has good insulation properties, effectively preventing motor leakage and reducing the weight of the fan blade, which means reducing energy consumption. The metal blade 201 has increased strength and is not easily deformed, which can generate a uniform and stable air source.

[0049] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A plastic-coated metal fan blade, comprising a bearing seat (1) and a fan blade body (2), characterized in that: The bearing seat (1) includes a hub (101), a bushing (102) and a connecting sleeve (103). The bushing (102) is fixedly installed in the hub (101) near the center, and the upper and lower sides of the bushing (102) are open. Three connecting sleeves (103) are evenly arranged circumferentially on the outer surface of the hub (101), and the fan blade body (2) is fixedly installed in each connecting sleeve (103). The fan blade body (2) includes a blade (201), a connecting plate (202) and a rectangular opening (203). The connecting plate (202) is fixedly installed on the side of the blade (201) near the connecting sleeve (103), and the connecting plate (202) is fixedly installed inside the connecting sleeve (103). Three rectangular openings (203) are evenly opened on the connecting plate (202). A concave groove (3) is provided on the upper surface of the blade (201), and a flow guiding protrusion (4) is formed on the lower surface of the blade (201) corresponding to the concave groove (3). The method for producing a plastic-coated metal fan blade, based on the aforementioned method for using a plastic-coated metal fan blade, includes the following steps: S1. Production of the main body of the fan blade: Select the metal raw materials used for the main body of the fan blade (2), press the metal into the required shape, use a stamping die to put the metal into the die, press the metal into the required shape through high pressure, and then grind and polish the main body of the fan blade (2) through a grinding and polishing machine and clean it. S2. Mold pretreatment: Clean, preheat and apply release agent to the mold parting surface of the injection mold. Clean the mold parting surface of the injection mold with a cleaning brush, then clean and preheat the injection mold with hot air, and then apply release agent with a brush. S3. Place the fan blade body: Place the three fan blade bodies (2) as needed into the cavity of the injection mold; S4. Mold closing and injection molding: The injection mold is closed, and the raw material in the injection molding machine is injected into the cavity of the injection mold through the injection port, so that the injected raw material forms a shaft seat (1), and the injection molded shaft seat (1) and the fan blade body (2) are injection molded into a whole. The temperature during injection is 200 degrees and the injection time is 30 seconds. S5. Cooling and Demolding: After ventilating and cooling the injection mold, open the air outlet of the injection mold to open the mold. During the mold opening process, high-pressure air is introduced into the mold through the injection port until demolding is completed, resulting in a complete fan blade. S6. Surface treatment: After injection molding, the burrs on the bearing seat (1) are cleaned, and the fan blade body (2) and bearing seat (1) are sprayed with a spray nozzle to obtain a complete fan blade.

2. The plastic-coated metal fan blade according to claim 1, characterized in that: A reinforcing rib (5) is fixedly installed in a rectangular shape between the inner wall of the hub (101) and the outer surface of the bushing (102).

3. A plastic-coated metal fan blade according to claim 1, characterized in that: The lower surface of the bushing (102) has a limiting groove (6).

4. A plastic-coated metal fan blade according to claim 1, characterized in that: The hub (101), bushing (102), connecting sleeve (103) and reinforcing rib (5) are injection molded integral structures.

5. A plastic-coated metal fan blade according to claim 1, characterized in that: The blade (201) and the connecting plate (202) are integrally formed.

6. A plastic-coated metal fan blade according to claim 1, characterized in that: The upper and lower sides of the blade (201) are both arc-shaped structures.

Images