Fan blade of axial flow fan

Abstract

The utility model discloses a fan blade of an axial flow fan, which relates to the field of fans, and is characterized by comprising a rotating wheel, a concave disc is mounted in the rotating wheel, the outer diameter of the concave disc is smaller than the inner diameter of the rotating wheel, through holes are formed in the peripheral wall of the concave disc, a plurality of counterweight bolts are mounted on the concave disc, and counterweight nuts are in threaded connection with the counterweight bolts. According to the utility model, when the axial flow fan is subjected to dynamic balance adjustment again, the counterweight nut and the counterweight bolt are detached, the counterweight bolt and the counterweight nut which are in threaded connection cannot damage the rotating wheel, the integrity of the surface of the rotating wheel can be well ensured, the counterweight bolt and the counterweight nut can be fixed on the concave disc after a dynamic balance test is completed, and the rotating wheel is prevented from being damaged. Due to the arrangement of the concave disc, the balance weight bolt and the balance weight nut are not prone to influencing the flatness of the peripheral wall of the rotating wheel, the rotating wheel can well drive the fan blades to generate airflow, and the concave disc made of aluminum alloy has the long service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to fan field, more specifically, it relates to a fan blade of axial flow fan. BACKGROUND

[0002] The axial flow fan is a kind of fan, and the airflow direction is the same as the shaft of fan blade, which is widely used in industry, commerce, agriculture and other fields, and is an important equipment indispensable in ventilation system.

[0003] The axial flow fan includes a shell, a motor and a fan blade, wherein the fan blade includes a runner fixedly connected to the output shaft of the motor and a plurality of blades fixed to the peripheral wall of the runner, and after the axial flow fan is used for a period of time, the axial flow fan needs to be maintained, including dynamic balance adjustment of the fan blade.

[0004] The dynamic balance of the fan blade directly affects the running stability of the axial flow fan, and people need to measure the fan blade by means of dynamic balance measuring instrument, and after determining the position needing adjustment, people fix the counterweight on the runner, and in actual operation, people generally weld the counterweight on the runner, and after a period of use, people need to test the dynamic balance of the fan blade again, and when the dynamic balance of the fan blade deviates, the original counterweight needs to be detached, and the surface of the runner is easily damaged in the process of detaching the counterweight, affecting the overall strength of the runner.

[0005] Therefore, a new scheme needs to be proposed to solve this problem. CONTENT OF THE UTILITY MODEL

[0006] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a fan blade of axial flow fan.

[0007] The above technical purpose of the utility model is realized by the following technical scheme: a fan blade of axial flow fan, including a runner with C-shaped cross section, a recessed disc is installed in the runner, the recessed disc is coaxially arranged with the runner, the outer diameter of the recessed disc is smaller than the inner diameter of the runner, a plurality of through holes are formed on the outer peripheral wall of the recessed disc, a plurality of counterweight bolts for adjusting the dynamic balance of the runner are installed on the recessed disc, and the counterweight bolts are threadedly connected with counterweight nuts at one end and pass through the through holes.

[0008] The utility model is further provided as follows: the plurality of through holes are arranged in annular array along the outer peripheral wall of the recessed disc, and the plurality of through holes are all waist-shaped holes.

[0009] The utility model is further provided as follows: a plurality of square grooves are formed on the recessed disc, and a plurality of limiting blocks embedded in the square grooves are arranged on the runner.

[0010] The utility model is further provided as follows: a chamfer is formed on the side wall of the limiting block away from the runner.

[0011] The utility model further sets up: the counterweight nut is provided with the arc surface for with the concave disc peripheral wall resistance.

[0012] The utility model further sets up: the surface of the limiting block is equipped with hard layer, the hard layer is used for with the inner wall of square groove resistance.

[0013] The utility model further sets up: the concave disc adopts aluminum alloy material to make.

[0014] In summary, the utility model has following beneficial effect: when the axial flow fan is carried out dynamic balance adjustment, can install counterweight bolt and counterweight nut in the position required, after using the axial flow fan adjusted to a period of time, need to adjust the axial flow fan again, people can unscrew counterweight nut from counterweight bolt, then carry out dynamic balance test to runner again, after determining the position of dynamic balance that need to adjust, install counterweight bolt in the perforation, then fix counterweight bolt with counterweight nut again, through the concave disc of setting with the coaxial installation of runner, make counterweight bolt and counterweight nut have a good installation position, and the installation of counterweight bolt and counterweight nut is not easy to influence the flatness of runner peripheral wall, make runner can drive fan leaf to produce airflow better, and the counterweight bolt and counterweight nut of screw thread connection installation can play good counterweight effect in the dynamic balance adjustment of runner, and the disassembly is convenient in subsequent adjustment, will not destroy the inner peripheral wall of runner, thereby the runner is protected better. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the structural schematic diagram of the utility model;

[0016] Figure 2 It is the partial explosion schematic diagram of the utility model, is used to show square groove and limiting block.

[0017] In the drawing: 1, runner;2, concave disc;3, perforation;4, counterweight bolt;5, counterweight nut;6, square groove;7, limiting block;8, motor. DETAILED DESCRIPTION

[0018] The utility model is described in detail below in connection with the drawings and examples.

[0019] A kind of axial flow fan fan leaf, such as Figure 1As shown, including motor 8 and through the limit nut installed on the motor 8 output shaft runner 1, runner 1 cross-section is C-shaped, the recessed disc 2 is installed in the runner 1, the recessed disc 2 is also limited in the output shaft by the limit nut, the recessed disc 2 is coaxial with the runner 1, the outer diameter of the recessed disc 2 is smaller than the inner diameter of the runner 1, a plurality of perforations 3 are provided on the outer wall of the recessed disc 2, a plurality of counterweight bolts 4 for adjusting the dynamic balance of the runner 1 are installed on the recessed disc 2, one end of the counterweight bolt 4 passes through the perforation 3 and is threadedly connected with the counterweight nut 5, during the dynamic balance adjustment of the axial flow fan, the counterweight bolt 4 and the counterweight nut 5 can be installed at the desired position, after the axial flow fan is used for a period of time after adjustment, when the axial flow fan needs to be adjusted again, people can unscrew the counterweight nut 5 from the counterweight bolt 4, then retest the dynamic balance of the runner 1, after determining the position of the dynamic balance adjustment, the counterweight bolt 4 is installed in the perforation 3, then the counterweight nut 5 is used to fix the counterweight bolt 4, by providing the recessed disc 2 coaxial with the runner 1, the counterweight bolt 4 and the counterweight nut 5 have a better installation position, and the installation of the counterweight bolt 4 and the counterweight nut 5 does not easily affect the flatness of the outer wall of the runner 1, so that the runner 1 can better drive the fan blade to produce airflow, the counterweight bolt 4 and the counterweight nut 5 are threadedly connected and installed, which can have a good counterweight effect in the dynamic balance adjustment of the runner 1, and the subsequent adjustment is convenient to disassemble, which will not damage the inner wall of the runner 1, thereby better protecting the runner 1.

[0020] As Figure 1 and Figure 2As shown, a plurality of perforations 3 are arranged in a ring array along the outer peripheral wall of the recessed disc 2, the plurality of perforations 3 are all waist-shaped holes, and the length of the plurality of perforations 3 is arranged along the thickness direction of the recessed disc 2. The form of the perforation 3 is set as a waist-shaped hole, so that when the counterweight bolt 4 is installed in the perforation 3, the counterweight bolt 4 can be moved along the thickness direction of the recessed disc 2, so that the counterweight bolt 4 can be adjusted along the inner wall of the perforation 3, so that the adjustment of the counterweight bolt 4 is more convenient, and people can adjust the position of the counterweight bolt 4 through continuous testing, so that the counterweight bolt 4 can provide better dynamic balance effect for the runner 1. A plurality of square grooves 6 are formed on the recessed disc 2, and a plurality of limiting blocks 7 embedded in the square grooves 6 are arranged on the runner 1. When the motor 8 output shaft provides torque for the runner 1, the torque on the runner 1 can be transmitted to the limiting block 7 through the inner wall of the square groove 6, so that the runner 1 and the recessed disc 2 are not easy to rotate relatively, so that the counterweight bolt 4 installed on the recessed disc 2 can provide better dynamic balance effect for the runner. A chamfer is formed on the side wall of the limiting block 7 away from the runner 1. The chamfer is formed to make the area of the end of the limiting block 7 away from the runner 1 smaller. After the maintenance of the recessed disc 2 is completed, the smaller end of the limiting block 7 can pass through the square groove 6 more quickly when the recessed disc 2 is installed on the runner 1, so that the installation of the recessed disc 2 is faster. The counterweight nut 5 is provided with an arc surface for abutting against the peripheral wall of the recessed disc 2. After one end of the counterweight bolt 4 passes through the perforation 3 on the peripheral wall of the recessed disc 2, the counterweight nut 5 is tightened on the counterweight bolt 4. One end of the counterweight nut 5 will abut against the inner peripheral wall of the recessed disc 2, and the arc surface arranged on one end of the counterweight nut 5 can better increase the friction area of the counterweight nut 5 and the inner peripheral wall of the recessed disc 2, so that the counterweight nut 5 can better limit the counterweight bolt 4 on the recessed disc 2. The surface of the limiting block 7 is provided with a hard layer. The hard layer is used to abut against the inner wall of the square groove 6. Specifically, the surface of the limiting block 7 is formed with a hard layer through carburizing and quenching process. When the axial flow fan rotates, the runner 1 and the recessed disc 2 will have a tendency to rotate relatively. This tendency will form a shear stress near the contact surface between the limiting block 7 and the inner wall of the square groove 6. The arrangement of the hard layer makes the surface strength of the limiting block 7 high, so that the limiting block 7 has good shear strength, so that the limiting block 7 is not easy to be damaged by shear stress. The recessed disc 2 is made of aluminum alloy. Specifically, the recessed disc 2 is made of 6061 aluminum alloy. Aluminum alloy has the advantages of higher strength and lighter weight than steel of the same volume, so that the mass of the recessed disc 2 is light and does not easily affect the rotation of the axial flow fan. At the same time, the strength of the recessed disc 2 is higher, so that the recessed disc 2 has a longer service life.

[0021] The above merely is preferred implementation manner of the present application, the protection scope of the present application is not only limited to the above examples, and belongs to the technical scheme under the idea of the present application all belongs to the protection scope of the present application. It should be pointed out that, for ordinary skilled person in the art, under the premise of not departing from the principle of the present application, some improvements and decorations, these improvements and decorations should also be considered as the protection scope of the present application.

Claims

1. An axial flow fan blade characterised in that: The utility model relates to a dynamic balance adjusting device for runner, including the runner (1) of section C shape, the recessed disc (2) is installed in the runner (1), the recessed disc (2) is coaxial with the runner (1) setting, the outer diameter of recessed disc (2) is less than the inner diameter of runner (1), the outer peripheral wall of recessed disc (2) is equipped with a plurality of perforation (3), a plurality of counterweight bolt (4) for adjusting the dynamic balance of runner (1) are installed on recessed disc (2), one end of counterweight bolt (4) passes through perforation (3) and is threadedly connected with counterweight nut (5).

2. An axial fan blade according to claim 1, wherein: A plurality of the perforation (3) is annular array distribution along the outer peripheral wall of recessed disc (2), and a plurality of the perforation (3) is all waist type hole.

3. An axial fan blade according to claim 2, wherein: The recessed disc (2) is equipped with a plurality of square groove (6), and the runner (1) is provided with a plurality of limiting block (7) embedded in the square groove (6).

4. An axial fan blade according to claim 3, wherein: The side wall of the limiting block (7) away from the runner (1) is provided with a chamfer.

5. An axial fan blade according to claim 4, wherein: The counterweight nut (5) is provided with an arc surface for abutting against the peripheral wall of the recessed disc (2).

6. An axial fan blade according to claim 5, wherein: The surface of the limiting block (7) is provided with a hard layer for abutting against the inner wall of the square groove (6).

7. An axial fan blade according to claim 6, wherein: The recessed disc (2) is made of aluminum alloy material.

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