Centrifugal fan blade

Abstract

The utility model discloses a centrifugal fan blade, which relates to the technical field of centrifugal fans, and comprises a blade body and an impeller main body, the blade body comprises a blade main body, a blade tail edge and a blade front edge which are integrally formed, the blade tail edge is positioned at the end part of the blade main body, and the blade front edge is positioned at the tail part of the blade main body. The upper end of the blade body is fixedly connected with an upper connecting plate, the lower end of the blade body is fixedly connected with a lower connecting plate which is consistent with the upper connecting plate in size, connecting holes are formed in the upper end of the upper connecting plate and the upper end of the lower connecting plate in a penetrating mode, the impeller body comprises an impeller upper disc and an impeller lower disc, and the impeller upper disc is movably connected to the upper end of the upper connecting plate; the impeller upper disc is movably connected to the lower end of the lower connecting plate, the impeller lower disc is movably connected to the lower end of the lower connecting plate, fixing holes are formed in the upper end of the impeller upper disc and the upper end of the impeller lower disc in a penetrating mode, the blade bodies are installed through the connecting plates, the lower connecting plate, the bolts and the nuts, and each blade can be independently detached and is convenient to maintain.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal fans, in particular to a centrifugal fan blade. Background Art

[0002] A centrifugal fan is a machine that relies on input mechanical energy to increase gas pressure and discharge gas. It is a driven fluid machine and is often used in the indoor unit of many air conditioning systems. Its function is to suck air from the room, process the air and adjust the temperature through the condenser and evaporator, and then send the processed air back to the room. Among them, the blade is one of the most important parts of the centrifugal fan.

[0003] At present, most of the blades of centrifugal fans are connected by welding. During welding, the surface of the blades will be deformed due to the influence of stress, which will have a certain impact on the performance of the centrifugal fan. When one of the blades is worn, it will affect the dynamic balance of the rotation of the entire fan. The blades are connected by welding, which is not convenient for replacement, and the maintenance time and cost are also high. At the same time, the current blades generate a lot of noise when working, which is not suitable for use in quiet public places. For this reason, we propose a centrifugal fan blade to solve the above problems. Utility Model Content

[0004] In order to solve the above technical problems, a centrifugal fan blade is provided. The technical solution solves the problem raised in the above background technology that most of the blades of the current centrifugal fans are connected by welding. During welding, the surface of the blades will be deformed due to the stress, which will have a certain impact on the performance of the centrifugal fan. When one of the blades is worn, it will affect the dynamic balance of the rotation of the entire fan. The blades are connected by welding, which is not convenient for replacement, and the maintenance time and cost are also high. At the same time, the current blades generate loud noise when working and are not suitable for use in quiet public places.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A centrifugal fan blade comprises a blade body and an impeller body, wherein the blade body comprises an integrally formed blade body, a blade trailing edge and a blade leading edge, wherein the blade trailing edge is located at the end of the blade body, and the blade leading edge is located at the tail of the blade body, an upper connecting plate is fixedly connected to the upper end of the blade body, and a lower connecting plate having the same size as the upper connecting plate is fixedly connected to the lower end of the blade body, and connecting holes are penetrated through the upper ends of the upper connecting plate and the lower connecting plate;

[0007] Among them, the impeller body includes an impeller upper plate and an impeller lower plate. The impeller upper plate is movably connected to the upper end of the upper connecting plate, and the impeller lower plate is movably connected to the lower end of the lower connecting plate. Fixing holes are opened through the upper ends of the impeller upper plate and the impeller lower plate.

[0008] Preferably, the interiors of the fixing holes and the connecting holes are both threadedly connected with fastening bolts, and the outer surfaces of the fastening bolts are threadedly connected with nuts.

[0009] Preferably, a coupling is provided at the middle portion of the upper end of the impeller lower plate.

[0010] Preferably, the blade body is in a concave arc shape.

[0011] Preferably, the thickness of the blade trailing edge and the blade leading edge is smaller than the thickness of the blade body.

[0012] Preferably, the outer edges of the trailing edge and the leading edge of the blade are both wavy.

[0013] Preferably, the blade body is arranged at an angle of 45 degrees to a center line connecting the impeller lower plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] This scheme proposes a centrifugal fan blade, wherein the end and tail of the blade body are provided with a blade leading edge and a blade trailing edge, the ratio of the thickness of the blade trailing edge and the blade leading edge to the thickness of the blade body is between 5% and 10%, and the thickness is much smaller than the blade body, and the outer edges of the blade trailing edge and the blade leading edge are wavy, which can reduce the generation of wake turbulence, reduce the diffusion and impact of turbulence, and thus reduce the noise generated when air flows through the blade.

[0016] In this solution, the blade body is installed through a connecting plate, a lower connecting plate, bolts and nuts, avoiding the influence of thermal stress of welding on the performance of the blade. At the same time, each blade can be disassembled independently for easy maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the blade body in the utility model;

[0019] Figure 3 It is a structural schematic diagram of the connecting hole in the utility model;

[0020] Figure 4 This is a schematic diagram of the structure of the upper plate of the impeller in the utility model;

[0021] Figure 5This is a schematic diagram of the structure of the lower plate of the impeller in the utility model;

[0022] Figure 6 It is a structural schematic diagram of the impeller body of the utility model.

[0023] The numbers in the figure are:

[0024] 1. Blade body; 2. Blade body; 3. Blade trailing edge; 4. Blade leading edge; 5. Upper connecting plate; 6. Lower connecting plate; 7. Connecting hole;

[0025] 8. Impeller body; 801. Impeller upper plate; 802. Impeller lower plate;

[0026] 9. Fixing hole; 10. Fastening bolt; 11. Nut; 12. Coupling. DETAILED DESCRIPTION

[0027] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0028] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a centrifugal fan blade comprises a blade body 1 and an impeller body 8, the blade body 1 comprises an integrally formed blade body 2, a blade trailing edge 3 and a blade leading edge 4, the blade trailing edge 3 is located at the end of the blade body 2, the blade leading edge 4 is located at the tail of the blade body 2, an upper connecting plate 5 is fixedly connected to the upper end of the blade body 1, a lower connecting plate 6 having the same size as the upper connecting plate 5 is fixedly connected to the lower end of the blade body 1, and a connecting hole 7 is penetrated through the upper ends of the upper connecting plate 5 and the lower connecting plate 6;

[0029] Among them, the impeller body 8 includes an impeller upper plate 801 and an impeller lower plate 802. The impeller upper plate 801 is movably connected to the upper end of the upper connecting plate 5, and the impeller lower plate 802 is movably connected to the lower end of the lower connecting plate 6. The upper ends of the impeller upper plate 801 and the impeller lower plate 802 are penetrated by fixing holes 9.

[0030] Furthermore, the fixing hole 9 and the connecting hole 7 have the same size, and the inside of the fixing hole 9 and the connecting hole 7 are both threadedly connected with a fastening bolt 10, and the outer surface of the fastening bolt 10 is threadedly connected with a nut 11. The fastening bolt 10 is passed through the fixing hole 9 and the connecting hole 7 and fixed by the nut 11, so that the blade body 1 can be installed between the impeller upper plate 801 and the impeller lower plate 802.

[0031] Furthermore, a coupling 12 is provided in the middle of the upper end of the impeller lower plate 802. The coupling 12 is used to connect with the driving shaft of the centrifugal fan.

[0032] Furthermore, the blade body 1 is in a concave arc shape with a bending angle between 20° and 45°. The arc surface design can reduce the resistance during airflow transition, thereby reducing energy loss and improving the airflow efficiency of the centrifugal fan.

[0033] Furthermore, the thickness of the blade trailing edge 3 and the blade leading edge 4 is less than the thickness of the blade body 2. The thinner design at the tail end can help reduce the generation of wake turbulence and reduce the diffusion and impact of turbulence.

[0034] Furthermore, the outer edges of the blade trailing edge 3 and the blade leading edge 4 are both wavy, and the wavy edge design can change the flow state of the airflow at the edge, delay the separation of the airflow, and thus reduce the generation of turbulence. This helps to improve the aerodynamic efficiency of the blade and reduce energy loss.

[0035] Reference Figure 5 As shown, the blade body 1 and the center line of the impeller lower plate 802 are arranged at an angle of 45 degrees. By installing the blades at a 45° tilt, the vibration and noise generated during the operation of the fan can be effectively reduced, and the overall operating stability can be improved.

[0036] Working principle: During installation, insert the blade body 1 between the impeller upper plate 801 and the impeller lower plate 802 and align the fixing holes 9 on the impeller upper plate 801 and the impeller lower plate 802 with the connecting holes 7 of the upper connecting plate 5 and the lower connecting plate 6, then pass the fastening bolts 10 through the fixing holes 9 and the connecting holes 7 and fix them with the nuts 11 to assemble the blade body 1.

[0037] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A centrifugal fan blade, characterized in that: The invention comprises a blade body (1) and an impeller body (8), wherein the blade body (1) comprises an integrally formed blade body (2), a blade trailing edge (3) and a blade leading edge (4), wherein the blade trailing edge (3) is located at the end of the blade body (2), and the blade leading edge (4) is located at the tail of the blade body (2); an upper connecting plate (5) is fixedly connected to the upper end of the blade body (1), and a lower connecting plate (6) having the same size as the upper connecting plate (5) is fixedly connected to the lower end of the blade body (1); and a connecting hole (7) is formed through the upper ends of the upper connecting plate (5) and the lower connecting plate (6); The impeller body (8) comprises an impeller upper plate (801) and an impeller lower plate (802); the impeller upper plate (801) is movably connected to the upper end of the upper connecting plate (5); the impeller lower plate (802) is movably connected to the lower end of the lower connecting plate (6); and fixing holes (9) are provided through the upper ends of the impeller upper plate (801) and the impeller lower plate (802).

2. A centrifugal fan blade according to claim 1, characterized in that: The interior of the fixing hole (9) and the connecting hole (7) are both threadedly connected with a fastening bolt (10), and the outer surface of the fastening bolt (10) is threadedly connected with a nut (11).

3. A centrifugal fan blade according to claim 1, characterized in that: A coupling (12) is provided at the middle portion of the upper end of the impeller lower plate (802).

4. A centrifugal fan blade according to claim 1, characterized in that: The blade body (1) is in a concave arc shape.

5. The centrifugal fan blade according to claim 1, characterized in that: The thickness of the blade trailing edge (3) and the blade leading edge (4) is smaller than the thickness of the blade body (2).

6. A centrifugal fan blade according to claim 1, characterized in that: The outer edges of the blade trailing edge (3) and the blade leading edge (4) are both wavy.

7. The centrifugal fan blade according to claim 1, characterized in that: The blade body (1) and the center line of the impeller lower plate (802) are arranged at an angle of 45 degrees.

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