An air-cooled horizontal permanent magnet motor centrifugal fan impeller structure

Abstract

The utility model discloses an air-cooled horizontal permanent magnet motor centrifugal fan impeller structure, the impeller structure includes an impeller front plate, an impeller reinforcement plate, blades and an impeller rear plate, the impeller front plate and the impeller rear plate are both annular flat plates, and the two are arranged parallel to each other at intervals, the surface of the impeller reinforcement plate is concentrically welded with the surface of the impeller rear plate, the blades are arc-shaped curved plates, the blades are evenly distributed between the impeller front plate and the impeller rear plate, and the two sides of the blades are vertically connected to the impeller front plate and the impeller rear plate. On the one hand, the utility model uses backward-inclined blade bending that is consistent with the airflow trajectory, has the characteristics of low noise and low energy loss, and increases the air intake; on the other hand, the air inlet end of the blade is a comb tooth structure, so that the boundary layer of the airflow layer on the blade is converted into turbulence earlier, avoiding boundary layer vortex diversion, effectively reducing noise and vibration, and can make the motor run smoothly for a longer time.

Description

Technical Field

[0001] The utility model belongs to the technical field of permanent magnet motors, in particular to an air-cooled horizontal permanent magnet motor centrifugal fan impeller structure. Background Art

[0002] In recent years, with the continuous development of rare earth permanent magnet technology, permanent magnet synchronous motors have become more and more ideal drive motors used in modern industrial sectors. They have the advantages of high overall efficiency, low maintenance, excellent speed regulation performance, and large overload starting capacity. When the ambient temperature is high and the load is large, if only natural cooling is used, it is sometimes unable to meet the heat dissipation requirements, so air cooling or water cooling is required for heat dissipation. For air-cooled horizontal permanent magnet motors, axial external ventilation is often used for heat dissipation, but centrifugal fans with axial external ventilation often produce large noise and insufficient air intake. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides an air-cooled horizontal permanent magnet motor centrifugal fan impeller structure.

[0004] The technical solution adopted by the utility model is: an air-cooled horizontal permanent magnet motor centrifugal fan impeller structure, the impeller structure includes an impeller front plate, an impeller reinforcement plate, blades and an impeller rear plate, the impeller front plate and the impeller rear plate are both annular flat plates, and the two are arranged parallel to each other and spaced apart, the surface of the impeller reinforcement plate is concentrically welded with the surface of the impeller rear plate, the blades are arc-shaped bent plates, the blades are evenly distributed between the impeller front plate and the impeller rear plate, and the two sides of the blades are vertically connected to the impeller front plate and the impeller rear plate.

[0005] As a further preferred embodiment of the present invention, the blade is a curved steel plate with a comb-toothed band at one end.

[0006] As a further preferred embodiment of the present invention, the inner circular end of the blade is the air inlet end, the outer circular end is the air outlet end, the air inlet end is comb-tooth shaped, and the air outlet end is smooth and flat.

[0007] As a further preferred embodiment of the present invention, an axial hole is provided at the center of the impeller reinforcement plate, and screw holes are provided around the axial hole.

[0008] The beneficial effects of the utility model are as follows: the technical solution of the utility model is adopted, on the one hand, the backward-inclined blade bending is consistent with the airflow trajectory, which has the characteristics of low noise and low energy loss, so that the air intake volume is increased. On the other hand, the air inlet end of the blade is a comb-tooth structure, so that the boundary layer of the airflow layer on the blade is converted into turbulence earlier, avoiding the boundary layer vortex diversion, and effectively reducing noise and vibration.

[0009] The utility model performs simulation calculation on the air volume and air pressure required for the heat dissipation of the motor, determines the appropriate fan power, the inlet and outlet area of ​​the base, the reasonable distribution of heat dissipation ribs, the size and number of the inlet and outlet holes of the internal ventilation duct, and the design and selection of the internal fan, adopts the structure of internal and external ventilation and heat dissipation, and combines the axial internal fan to dissipate the heat of the air gap and the rotor magnetic steel, effectively reduces the temperature of the motor stator and rotor, ensures the safe and reliable operation of the permanent magnet motor, reduces the production and maintenance costs, and improves the production efficiency.

[0010] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the radial cross section and appearance of a centrifugal fan used in the impeller of the utility model;

[0012] Figure 2 This is a schematic diagram of the AA section impeller structure of the utility model.

[0013] The markings in the figure are: 1. impeller front plate; 2. impeller reinforcement plate; 3. blades; 4. impeller rear plate. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1 As shown, an air-cooled horizontal permanent magnet motor centrifugal fan impeller structure is composed of a fan cover, an impeller and a fixed bracket structure. The motor rotates clockwise from the air inlet, driving the impeller to rotate. Due to the pressure difference, the cold air enters from the air inlet, and the cold air takes away the heat on the surface of the fan cover through the impeller and changes the direction of the air path. The cold air takes away the heat from the heat dissipation ribs on the surface of the permanent magnet motor base through the air outlet.

[0016] like Figure 2 As shown, an air-cooled horizontal permanent magnet motor centrifugal fan impeller structure, the impeller structure comprising an impeller front plate (1), an impeller reinforcement plate (2), blades (3) and an impeller rear plate (4), the impeller front plate (1) and the impeller rear plate (4) are both annular flat plates, and the two are arranged parallel to each other and spaced apart, the surface of the impeller reinforcement plate (2) and the surface of the impeller rear plate (4) are concentrically welded, the blades (3) are arc-shaped curved plates, and the blades (3) are evenly distributed between the impeller front plate (1) and the impeller rear plate (4).

[0017] In this embodiment, the air inlet end of the blade (3) is comb-tooth shaped, and the air outlet end is a smooth plane. The blade (3) is vertically and evenly distributed between the impeller front plate and the impeller rear plate in a backward inclined manner. As the impeller rotates clockwise, since the air inlet end of the blade is a comb-tooth structure, the boundary layer of the air flow layer on the air inlet end of the blade is converted into turbulent flow earlier, and the backward curved arc blade makes the air outlet smoother and more uniform, generating a larger air volume and reducing the impeller vibration.

[0018] Through actual testing, by comparing the impeller of the utility model with the impeller of the traditional backward inclined straight blade, we obtained the following data: the noise of the straight blade impeller is 82dB, the inlet wind speed is 16.6m / s, and the jitter is large; the noise of the new comb-shaped curved blade is 80dB when working, the inlet wind speed is 17m / s, and the jitter is small.

[0019] In summary, under the condition of safe operation of the same motor, the impeller structure of the utility model has lower noise, higher inlet wind speed, smaller impeller vibration than the impeller of the traditional backward inclined straight blades, which can make the motor run smoothly for a longer time.

[0020] 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 above embodiments do not limit the protection scope of the utility model in any form, and all technical solutions obtained by equivalent replacement and the like fall within the protection scope of the utility model.

[0021] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. An air-cooled horizontal permanent magnet motor centrifugal fan impeller structure, characterized in that: The impeller structure comprises an impeller front plate (1), an impeller reinforcement plate (2), blades (3) and an impeller rear plate (4); the impeller front plate (1) and the impeller rear plate (4) are both annular flat plates, and are arranged parallel to each other and spaced apart; the surface of the impeller reinforcement plate (2) is welded concentrically with the surface of the impeller rear plate (4); the blades (3) are curved plates with one end in a comb-shaped shape; the blades (3) are evenly distributed between the impeller front plate (1) and the impeller rear plate (4), and the two sides of the blades (3) are vertically connected to the impeller front plate (1) and the impeller rear plate (4).

2. The air-cooled horizontal permanent magnet motor centrifugal fan impeller structure according to claim 1, characterized in that: The inner circular end of the blade (3) is the air inlet end, and the outer circular end is the air outlet end; the air inlet end is in a comb-tooth shape, and the air outlet end is in a smooth flat shape.

3. The air-cooled horizontal permanent magnet motor centrifugal fan impeller structure according to claim 1, characterized in that: The impeller reinforcing plate (2) is provided with an axial hole at its center, and screw holes are provided around the axial hole.

Images