Axial flow fan with inner cylinder

Abstract

The utility model relates to the field of fans, in particular to an axial flow fan with an inner barrel. The axial flow fan with the inner cylinder comprises the inner cylinder, an impeller, a guide vane, an air cylinder, a supporting block and a motor, the supporting block is arranged on the inner wall of the inner cylinder, bolts are arranged on the supporting block and the inner cylinder, the motor is fixed with the inner cylinder through the bolts, and a gap is formed between the motor and the inner cylinder.

Description

Technical Field

[0001] The utility model relates to the field of fans, in particular to an axial flow fan with an inner cylinder. Background Art

[0002] As a ventilator, axial flow fans are widely used. They can be used for ventilation in general factories, warehouses, offices, and can also be used for ventilation in ships. Therefore, there are higher requirements for the vibration of axial flow fans.

[0003] Axial fans are generally installed in two ways: horizontal and vertical. Figure 4 , Figure 5 .

[0004] In horizontal installation, the motor bracket is welded to the wind tube, and the motor foot is installed on the motor bracket plate by bolts. Since the motor bracket is welded to the wind tube and difficult to process after welding, the coaxiality of the motor and the wind tube is difficult to accurately control, resulting in low installation accuracy.

[0005] In vertical installation, the motor is connected to the wind tube through four motor bracket plates. Since the motor bracket plates and the casing are connected with bolts and cannot be fine-machined, the coaxiality of the motor and the wind tube is difficult to accurately control, resulting in low installation accuracy.

[0006] These two installation structures are difficult to ensure the concentricity of the impeller and the wind tube, and the installation accuracy is not high, which easily leads to uneven gaps between the impeller and the wind tube, causing increased vibration of the fan. Summary of the invention

[0007] The utility model hopes to provide an axial flow fan with an inner cylinder, and the specific scheme is as follows:

[0008] An axial flow fan with an inner cylinder comprises an inner cylinder, an impeller, a guide vane, a wind cylinder, a support block and a motor. The inner wall of the inner cylinder is provided with a support block, bolts are arranged on the support block and the inner cylinder, the motor is fixed to the inner cylinder by the bolts, and there is a gap between the motor and the inner cylinder.

[0009] A bolt gasket is arranged on the outer side of the inner cylinder, and the bolt gasket is welded on the outer side of the inner cylinder.

[0010] The support block is welded on the inner wall of the inner cylinder.

[0011] The support block has a thickness of 20 to 40 mm.

[0012] The guide vane is connected to the inner cylinder by welding, and the guide vane is fixed to the wind cylinder by welding.

[0013] The number of guide vanes is 8.

[0014] The number of the supporting blocks is 8.

[0015] The beneficial effects of the utility model: solve the problems of low precision and high vibration of conventional fans. The specific (innovative points) are as follows: in the inner cylinder of the axial flow fan, the inner cylinder is connected to the wind cylinder through 8 guide vanes, which improves the efficiency of the fan while ensuring support; a fine processing allowance is reserved when the support block is cut, and after welding with the inner cylinder, it is finely processed together with the casing to ensure the concentricity of the inner cylinder and the casing, and to ensure the assembly accuracy of the fan; the thickness of the support block after fine processing is 20 to 40 mm. During the operation of the fan, cooling air passes through the gap reserved between the motor and the inner cylinder, which can meet the cooling requirements of the motor, and the motor does not need to add an additional heat dissipation device; the fan using this inner cylinder can effectively reduce its vibration value, ensuring that the fan works under lower vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of an axial flow fan with an inner cylinder according to the utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the structure of an axial flow fan with an inner cylinder according to the utility model. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the structure of an axial flow fan with an inner cylinder according to the utility model. Figure 3 ;

[0019] Figure 4 For existing technology Figure 1 ;

[0020] Figure 5 For existing technology Figure 2 ;

[0021] The numbers are: 1. air cylinder; 2. impeller; 3. guide vane; 4. inner cylinder; 5. support block; 6. motor. DETAILED DESCRIPTION

[0022] The utility model is an inner cylinder structure designed for a high-precision, low-vibration axial flow fan. The fan is mainly composed of a wind cylinder 1, an impeller 2, 8 guide vanes 3, an inner cylinder 4, 8 support blocks 5, a motor 6 and 8 bolt washers.

[0023] The guide vane 3 is connected to the inner cylinder 4 by welding, the support block 5 is welded to the inner wall of the inner cylinder 4, the bolt gasket is welded to the outer wall of the inner cylinder 4, and the inner cylinder 4 after welding is fixed to the wind tube 1 by welding through the guide vane 3. Since the support block 5 has reserved a processing allowance when cutting, the inner cylinder 4 and the wind tube 1 are finely processed after welding to ensure the concentricity of the inner cylinder 4 and the wind tube 1, and then the motor 6 is installed into the inner cylinder 4, and the motor 6 and the inner cylinder 4 are fixed by 8 bolts.

[0024] The thickness of the support block 5 after fine processing is 20-40 mm. During the operation of the fan, cooling wind passes through the gap reserved between the motor 6 and the inner tube 4, which can meet the cooling requirements of the motor 6, and the motor 6 does not need to add an additional heat dissipation device.

[0025] The axial flow fan using the inner cylinder 4 structure can ensure the concentricity of the motor 6, the impeller 2 and the wind cylinder 1, and ensure the assembly accuracy of the fan. The motor 6 and the inner cylinder 4 are connected to the wind cylinder 1 through 8 guide vanes 3, which ensures the supporting strength and can effectively reduce the vibration of the fan. After actual testing, the vibration intensity of the 12# fan when elastically installed is 0.87mm / s.

[0026] The above description is not a limitation of the design of the utility model, and the design of the utility model is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the design of the utility model also fall within the protection scope of the design of the utility model.

Claims

1. An axial flow fan with an inner cylinder, characterized in that: It includes an inner cylinder, an impeller, a guide vane, a wind cylinder, a support block and a motor. The inner wall of the inner cylinder is provided with a support block. Bolts are arranged on the support block and the inner cylinder. The motor is fixed to the inner cylinder by the bolts. There is a gap between the motor and the inner cylinder.

2. An axial flow fan with an inner cylinder as claimed in claim 1, characterized in that: A bolt gasket is arranged on the outer side of the inner cylinder, and the bolt gasket is welded on the outer side of the inner cylinder.

3. An axial flow fan with an inner cylinder as claimed in claim 1, characterized in that: The support block is welded on the inner wall of the inner cylinder.

4. The axial flow fan with an inner cylinder according to claim 1, characterized in that: The support block has a thickness of 20-40 mm.

5. The axial flow fan with an inner cylinder according to claim 1, characterized in that: The guide vane is connected to the inner cylinder by welding, and the guide vane is fixed to the wind cylinder by welding.

6. The axial flow fan with an inner cylinder according to claim 1, characterized in that: The number of guide vanes is 8.

7. An axial flow fan with an inner cylinder as claimed in claim 1, characterized in that: The number of the supporting blocks is 8.

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