Fan blade of industrial fan

Abstract

The utility model provides a fan blade of an industrial fan, and belongs to the technical field of machinery. The problems that the structural strength of fan blades of an existing industrial fan is not high, and the service life is affected are solved. The fan blade of the industrial fan comprises a body, the body is of an integrated structure formed by continuously bending a single plate body, the body comprises a left upper fan blade part, a right upper fan blade part and a lower fan blade part, the middle of the lower fan blade part is provided with a supporting part formed by bending upwards, and the left upper fan blade part and the right upper fan blade part are located on the two sides of the upper end of the supporting part respectively. And the end parts of the left upper fan blade part and the right upper fan blade part abut against the corresponding outer side walls of the supporting part and are fixedly connected through welding. The fan blade of the industrial fan has the advantages of being high in structural strength, good in welding effect and long in service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a fan blade, in particular to a fan blade of an industrial fan. Background Art

[0002] Industrial fans, a common device for space ventilation and cooling, are widely used in large spaces such as industrial plants, logistics warehouses, waiting rooms, exhibition halls, gymnasiums, and supermarkets. Large-diameter industrial fans create downward airflow, which, upon encountering the ground, generates horizontal airflow. The extent of airflow diffusion is related to the fan's diameter, while the speed of airflow diffusion is related to the speed of the fan blades. If the fan operates continuously, the airflow will move outward in large quantities until it encounters a side wall or obstacle, where it then rises, thus forming a continuous air circulation. Industrial fans can push large amounts of air to the ground, forming a horizontal airflow layer at a certain height above the ground, thereby promoting overall air circulation. This advantage lies in comprehensive ground coverage and three-dimensional air circulation. The fan covers a large area and consumes low energy.

[0003] For example, a new direct-drive industrial fan disclosed in a Chinese patent document (Application No. 201921418117.6) includes a motor and blades mounted on the motor. The upper plate of the blades is bent downward to form a long, curved strip. One long side of the lower plate is connected to the long side of the upper plate, and the other long side is welded to the underside of the upper plate to form a long, arched cavity. The upper side of the lower plate is provided with several reinforcing ribs along its length. The blades of this industrial fan have low structural strength, which affects their service life. Summary of the Invention

[0004] The purpose of the utility model is to solve the above problems in the existing technology and to provide an industrial fan blade with high structural strength, good welding effect and long service life.

[0005] The purpose of the utility model can be achieved through the following technical solutions: A fan blade of an industrial fan, including a body, characterized in that the body is a single plate formed into an integral structure by continuous bending, the body includes an upper left fan blade portion, an upper right fan blade portion and a lower fan blade portion, the middle portion of the lower fan blade portion has an upward bending support portion, the upper left fan blade portion and the upper right fan blade portion are respectively located on both sides of the upper end of the support portion, and the ends of the upper left fan blade portion and the upper right fan blade portion are against the corresponding outer side walls of the support portion and are fixedly connected by welding.

[0006] The upper left fan blade portion and the upper right fan blade portion are respectively located on both sides of the upper end of the support portion. The ends of the upper left fan blade portion and the upper right fan blade portion are against the corresponding outer side walls of the support portion and are fixedly connected by welding, which increases the structural strength of the fan blade and improves the service life. It is not easy to produce cold welds during welding, which improves the welding effect. Since the main body adopts a single plate body and is formed into an integrated structure through continuous bending, the fan blade is easy to manufacture and has high strength and a long service life.

[0007] In the aforementioned industrial fan blade, the upper left and right blade portions and the upper end surface of the support portion form a smooth transition to form a flow-guiding surface, which is composed of at least two curved surfaces with different curvatures. This arrangement improves the flow-guiding effect of the fan blade.

[0008] In the above-mentioned industrial fan blade, the support portion is triangular in shape. With the above-mentioned structure, the support portion has a better supporting effect, improves the structural strength of the fan blade, and thus increases the service life.

[0009] In the above-mentioned industrial fan blade, the end of the upper left blade portion has a downwardly bent left abutting portion, which abuts against the outer wall of the upper end of the support portion, and the end of the upper right blade portion has a downwardly bent right abutting portion, which abuts against the outer wall of the upper end of the support portion. By abutting the left and right abutting portions against the outer wall of the upper end of the support portion, the welding process and connection effect are improved, making the structure of the fan blade more reliable and stable.

[0010] In the aforementioned industrial fan blade, the upper end of the support portion is provided with inclined limit portions on both sides, and the left and right abutting portions abut against the corresponding limit portions. The left and right abutting portions abut against the corresponding limit portions, so that the left and right abutting portions fit closely with the limit portions, and are less likely to deviate during welding, thereby improving the welding effect and increasing the strength of the fan blade.

[0011] In the above-mentioned industrial fan blade, the portion where the lower blade portion is connected to the support portion is fixedly connected by welding. With the above arrangement, the connection between the lower blade portion and the support portion is firm and the transition is smooth, thereby improving the flow-guiding performance of the fan blade.

[0012] In the aforementioned industrial fan blade, the side of the lower blade portion near the support portion is a mounting portion, the cavity is for inserting a connecting plate, and the sidewalls of the mounting portion, support portion, and upper left blade portion are for the connecting plate to abut against. The connecting plate is inserted into the cavity and abuts against the mounting portion, support portion, and inner sidewall of the upper left blade portion, and is fixedly connected by screws, which has the advantage of a secure connection for the connecting plate. Alternatively, the mounting portion is located to the right of the support portion, and the connecting plate is inserted into the cavity and abuts against the mounting portion, support portion, and inner sidewall of the upper right blade portion, and is fixedly connected by screws.

[0013] In the above-mentioned fan blade of an industrial fan, the wall thickness of the body is 0.4-1.2 mm.

[0014] In the above-mentioned industrial fan blade, the material of the blade is high-strength steel, and its yield strength is 350MPa-1000MPa. The blade adopts the above-mentioned high-strength steel, which has the advantages of high strength and long service life.

[0015] Compared with the existing technology, the fan blades of this industrial fan have the following advantages:

[0016] 1. The upper left blade portion and the upper right blade portion are respectively located on both sides of the upper end of the support portion. The ends of the upper left blade portion and the upper right blade portion are against the corresponding outer side walls of the support portion and are fixedly connected by welding, which increases the structural strength of the fan blade and improves the service life. It is not easy to produce cold welding during welding, which improves the welding effect.

[0017] 2. Since the main body adopts a single plate through continuous bending to form an integrated structure, the fan blade is easy to manufacture, has a stable structure, high strength and a long service life;

[0018] 3. The support part is triangular in shape, and the lower fan blade is bent upward to form the support part, which makes the support part have a better supporting effect, improves the structural strength, and thus increases the service life;

[0019] 4. The parts where the lower blade part is connected to the support part are fixedly connected by welding, so that the connection between the lower blade part and the support part is firm and the transition is smooth, thereby improving the flow guidance performance of the fan blade;

[0020] 5. The fan blade is made of high-strength steel with a yield strength of 350MPa-1000MPa, which has the advantages of high strength and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic cross-sectional view of the blades of this industrial fan.

[0022] Figure 2 This is a schematic diagram of the insertion connection pad of the fan blade of this industrial fan.

[0023] Figure 3 This is a cross-sectional diagram of another type of blade of this industrial fan.

[0024] Figure 4 yes Figure 1 C is a partial enlarged schematic diagram.

[0025] In the figure, 1, main body; 1a, upper left fan blade portion; 1b, left abutment portion; 1c, upper right fan blade portion; 1d, right abutment portion; 1e, guide surface; 2, lower fan blade portion; 2a, lower left fan blade portion; 2b, lower right fan blade portion; 3, supporting portion; 3a, limiting portion; 4, mounting portion; 5, connecting pad; m, weld. DETAILED DESCRIPTION

[0026] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0027] like Figure 1 and 2 As shown in Figure 4, a blade of an industrial fan includes a body 1. The body 1 is a single plate formed into an integral structure by continuous bending, and a cavity is formed in the middle thereof. The body 1 includes an upper left blade portion 1a, an upper right blade portion 1c, and a lower blade portion 2. The middle portion of the lower blade portion 2 has a support portion 3 bent upward, and the support portion 3 is triangular. The end of the upper left blade portion 1a has a left abutting portion 1b bent downward, and the left abutting portion 1b abuts against the outer side wall of the upper end of the support portion 3 and is fixedly connected by welding to form a weld m. The end of the upper right blade portion 1c has a right abutting portion 1d bent downward, and the right abutting portion 1d abuts against the outer side wall of the upper end of the support portion 3 and is fixedly connected by welding to form a weld m. Specifically, the body 1 is a single plate formed into an integral structure by continuous bending and welding.

[0028] The upper left blade portion 1a, the upper right blade portion 1c and the upper end surface of the support portion 3 are smoothly transitioned to form a guide surface 1e, and the guide surface 1e is composed of at least two arc-shaped surfaces with different curvatures.

[0029] The connection between the lower blade portion 2 and the support portion 3 is welded together to form a weld seam m, ensuring a secure connection and a smooth transition between the lower blade portion 2 and the support portion 3, thereby improving the airflow performance of the blade. The side of the lower blade portion 2 near the support portion 3 is a mounting portion 4, into which a connecting plate 5 is inserted. The mounting portion 4, the support portion 3, and the sidewall of the upper left blade portion 1a are abutted against the connecting plate 5.

[0030] The wall thickness of this fan blade is 0.4-1.2mm, and the material is high-strength steel, and its yield strength is 350MPa-1000MPa, which has the advantages of high strength and long service life.

[0031] The upper left blade portion 1a and the upper right blade portion 1c are respectively located on both sides of the upper end of the support portion 3. The ends of the upper left blade portion 1a and the upper right blade portion 1c are against the corresponding outer walls of the support portion 3 and are fixedly connected by welding, which increases the structural strength of the fan blades and improves the service life. It is not easy to produce cold welds during welding, which improves the welding effect. Figure 3 As another way, Figure 3 As shown, the upper end of the support portion 3 has inclined limit portions 3a on both sides. The left and right abutment portions 1b and 1d abut against the corresponding limit portions 3a, so that the left and right abutment portions 1b and 1d are closely aligned with the limit portions 3a, which is not easily offset during welding. This improves the welding effect, avoids the occurrence of cold welds, and increases the strength of the fan blade. Because the main body 1 adopts a single plate body formed into an integrated structure through continuous bending, the fan blade is easy to manufacture, has high strength, and has a long service life.

[0032] The connecting plate 5 is inserted into the cavity and abuts against the inner sidewall of the mounting portion 4, the support portion 3, and the upper left fan blade portion 1a, and is fixedly connected by screws, which has the advantage of a secure connection of the connecting plate 5. As another embodiment, the mounting portion 4 is located to the right of the support portion 3, and the connecting plate 5 is inserted into the cavity and abuts against the inner sidewall of the mounting portion 4, the support portion 3, and the upper right fan blade portion 1c, and is fixedly connected by screws.

[0033] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0034] Although this document frequently uses terms such as body 1, upper left blade portion 1a, left abutment portion 1b, upper right blade portion 1c, right abutment portion 1d, guide surface 1e, lower blade portion 2, lower left blade portion 2a, lower right blade portion 2b, support portion 3, limiting portion 3a, mounting portion 4, connecting plate 5, and weld m, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A fan blade of an industrial fan, comprising a body (1), characterized in that: The main body (1) is a single plate formed into an integral structure by continuous bending, wherein a cavity is formed in the middle thereof, and the main body (1) comprises an upper left blade portion (1a), an upper right blade portion (1c) and a lower blade portion (2), wherein the middle portion of the lower blade portion (2) has a support portion (3) bent upward, and the upper left blade portion (1a) and the upper right blade portion (1c) are respectively located on both sides of the upper end of the support portion (3), and the ends of the upper left blade portion (1a) and the upper right blade portion (1c) are against the corresponding outer side walls of the support portion (3) and are fixedly connected by welding.

2. The fan blade of an industrial fan according to claim 1, characterized in that: The upper left blade portion (1a), the upper right blade portion (1c) and the upper end surface of the support portion (3) smoothly transition to form a guide surface (1e), and the guide surface (1e) is composed of at least two arc-shaped surfaces with different curvatures.

3. The fan blade of an industrial fan according to claim 1, characterized in that: The supporting portion (3) is triangular in shape.

4. The blade of an industrial fan according to claim 1, 2 or 3, characterized in that: The end of the upper left blade portion (1a) has a left abutting portion (1b) bent downward, and the left abutting portion (1b) abuts against the outer wall of the upper end of the support portion (3); the end of the upper right blade portion (1c) has a right abutting portion (1d) bent downward, and the right abutting portion (1d) abuts against the outer wall of the upper end of the support portion (3).

5. The blade of an industrial fan according to claim 4, characterized in that: Both sides of the upper end of the support portion (3) are provided with inclined limiting portions (3a), and the left abutting portion (1b) and the right abutting portion (1d) abut against the corresponding limiting portions (3a).

6. The blade of an industrial fan according to claim 1, 2 or 3, characterized in that: The portion where the lower fan blade portion (2) is connected to the support portion (3) is fixedly connected by welding.

7. The blade of an industrial fan according to claim 1, 2 or 3, characterized in that: The side of the lower blade portion (2) close to the support portion (3) is a mounting portion (4), the cavity is for the connecting pad (5) to be inserted into, and the mounting portion (4), the support portion (3) and the side wall of the upper left blade portion (1a) are for the connecting pad (5) to abut against.

8. The blade of an industrial fan according to claim 1, 2 or 3, characterized in that: The wall thickness of the main body (1) is 0.4-1.2 mm.

9. The blade of an industrial fan according to claim 1, 2 or 3, characterized in that: The material of the main body (1) is high-strength steel, and its yield strength is 350MPa-1000MPa.

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