CN201122878Y - Novel wind path low pressure three-phase asynchronous motor - Google Patents

Abstract

The utility model relates to the technical field of motors, in particular to a novel wind path low-voltage three-phase asynchronous motor, which comprises a casing, wherein a stator, a rotor and a rotor shaft are arranged in the casing, and the inner wall of the casing is provided with a frame ventilating duct; the rotor shaft is provided with an inner fan which is positioned at one side of the rotor; the inner fan comprises a fan wheel and an air guide cylinder, the fan wheel is sleeved on the rotor shaft, and the air guide cylinder is arranged at the front end of the fan wheel; the utility model discloses increase the inner fan on the rotor shaft to dispose the guide duct, because the fan wheel external diameter of inner fan is more than the aluminium fan blade increase, and the fan air outlet is nearer apart from the air intake distance of frame ventiduct, and the effect of guide duct in addition, the windage is less, the wind pressure reduces less, heat-conduction accelerates, because the increase of fan external diameter, wind pressure, amount of wind also increase by a wide margin, therefore strengthened the cooling effect, make the stator temperature rise reduce by a wide margin.

Description

A New Type of Air Circuit Low Voltage Three-phase Asynchronous Motor

Technical field:

The utility model relates to the technical field of electric motors, in particular to a novel wind path low-voltage three-phase asynchronous electric motor.

Background technique:

In the past two years, my country's economic situation has been relatively good, and the motor industry has developed rapidly. Now H315～H355 three-phase asynchronous motors have become hot-selling products and have achieved better economic benefits.

H315～H355 low-voltage three-phase asynchronous motors are all based on the unified design of Shanghai Electric Appliance Research Institute; the design air path structure is divided into two paths: inner and outer. As shown in Figure 1, the path of the inner air path is: one end of the end ring 02 of the cast aluminum rotor 01 is cast with an aluminum fan blade 03, and after the cast aluminum rotor 01 rotates, the hot air in the air duct of the cast aluminum rotor enters into the air duct 05 of the machine base (machine Shell 06 circumference has four machine base air ducts 05), comes out by the machine base air duct 05 other end and enters the axial air duct of cast aluminum rotor 01 again, goes round and begins again. The role of the aluminum blades 03 of the cast aluminum rotor 01 is to stir the air in the inner cavity of the motor, and conduct the heat of the motor evenly through the air circulation. The path of the external air path is to install an external fan 08 and an external wind cover 09 at the axially outer end of the rotor shaft of the motor. After the cast aluminum rotor 01 rotates, the external fan 08 makes the air flow, and the air flow is forced by the external wind cover 09. Turn to blow the circumferential surface of the motor casing 06 to take away the heat generated in the inner cavity of the motor, thereby achieving the purpose of reducing the temperature rise.

Practice has proved that the H315～H355 motors have a certain effect of setting the inner air path, and the process of casting aluminum fan blade 03 at the end ring 02 is relatively simple, but the disadvantage is that the outer diameter of the fan blade is limited by the outer diameter of the cast aluminum rotor 01, while The outer diameter of the fan blade is the most important factor for generating wind pressure and air volume, and has a great influence on ventilation and cooling. In addition, the distance between the air outlet of the aluminum fan blade 03 and the air inlet 04 of the air channel 05 of the machine base is relatively large, so the wind resistance is relatively large. Large, the airflow is scattered, and the wind pressure has been reduced a lot when reaching the air inlet 04 of the air duct 05 of the machine base, so that the ventilation and heat dissipation effect is not very satisfactory.

Utility model content:

The purpose of the utility model is to provide a new type of air path low-voltage three-phase asynchronous motor, which can greatly reduce the temperature rise of the stator and increase the reliability of the motor.

In order to achieve the above object, the utility model adopts the following technical solutions:

It includes a casing, in which a stator, a rotor, and a rotor shaft are installed, and the inner wall of the casing has an air duct for a machine base; an internal fan is installed on the rotor shaft, and the internal fan is located on one side of the rotor.

The inner fan includes a fan wheel and an air guide tube, the fan wheel is sleeved on the rotor shaft, and the air guide tube is installed at the front end of the fan wheel.

The fan wheel is positioned by the fan cover, and the fan cover and the fan wheel are connected and fixed by fasteners.

An outer wind cover is provided on the outside of the casing, and an external fan is installed between the outer wind cover and the casing.

The beneficial effect of the utility model is that the inner fan is added on the rotor shaft, and the air guide tube is arranged, because the outer diameter of the fan wheel of the inner fan is larger than that of the aluminum fan blade, and the air outlet of the fan is farther away from the air duct of the machine base. The distance between the air inlets is relatively close, coupled with the function of the air guide tube, the wind resistance is small, the wind pressure drop is small, and the heat conduction is accelerated. Due to the increase in the outer diameter of the fan, the wind pressure and air volume are also greatly increased, thus enhancing the cooling effect and making The temperature rise of the stator is greatly reduced.

Description of drawings:

Figure 1 is a structural schematic diagram of an existing motor

Fig. 2 is a schematic diagram of the structure of the inner fan of the present utility model

Fig. 3 is a structural representation of the utility model

Detailed ways:

Below in conjunction with accompanying drawing, the utility model is further described.

See accompanying drawing 2,3, the utility model comprises casing 1, and stator 2, rotor 3, rotor shaft 4 are installed in casing 1, and other existing related accessories are also installed in casing 1, do not repeat them here, The inner wall of the casing 1 has a base air channel 5 ; an inner fan 6 is installed on the rotor shaft 4 , and the inner fan 6 is located on one side of the rotor 3 .

Described interior fan 6 comprises fan wheel 7, air guide tube 8, and fan wheel 7 is sleeved on the rotor shaft 4, and air guide tube 8 is installed on fan wheel 7 front ends, and the outer diameter of fan wheel 7 can be bigger, makes inner The air outlet of the fan 6 is as close as possible to the air inlet of the air channel 5 of the base;

The fan wheel 7 is positioned by the fan cover 9 , the fan cover 9 and the fan wheel 7 are connected and fixed by a fastener 10 , and the inner fan 6 can rotate together with the rotor shaft 4 .

The outside of the casing 1 is provided with an outer wind cover 11, and an outer fan 12 is installed between the outer wind cover 11 and the casing 1. The structure of the outer wind cover 11 and the outer fan 12 is consistent with the existing motor structure, and will not be described here. repeat.

When the rotor shaft 4 rotates, it drives the inner fan 6 to run, so that the hot air in the air duct enters the base air duct 5 from the rotor inner air duct along the air guide tube 8, and then comes out from the other end of the base air duct 5 and enters the rotor 3 Axial air ducts go round and round.

Adding an inner fan 6 on the rotor shaft 4 and configuring an air guide tube 8 can strengthen the internal air circulation and improve the heat dissipation effect, that is, strengthen the internal heat conduction, and the practice has proved that the effect is very good. After adopting the new internal air path structure, the temperature rise can be reduced by 10-15K. Due to the increase of the outer diameter of the fan, the wind pressure and air volume are also greatly increased, thereby enhancing the cooling effect. As the temperature rise of the stator is greatly reduced, the reliability of the motor is increased.

Claims (4)

1. A new air-circuit low-voltage three-phase asynchronous motor, which includes a casing (1), a stator (2), a rotor (3), a rotor shaft (4), and a casing (1) are installed in the casing (1). The inner wall has an air channel (5) of the machine base; it is characterized in that: an inner fan (6) is installed on the rotor shaft (4), and the inner fan (6) is located on one side of the rotor (3). 2. A new air path low-voltage three-phase asynchronous motor according to claim 1, characterized in that: the inner fan (6) includes a fan wheel (7), an air guide tube (8), a fan wheel ( 7) Put it on the rotor shaft (4), and the air guide tube (8) is installed on the front end of the fan wheel (7). 3. A new air-circuit low-voltage three-phase asynchronous motor according to claim 2, characterized in that: the fan wheel (7) is positioned by the fan cover (9), and the fan cover (9) is connected to the fan wheel (7) ) are connected and fixed by fasteners (10). 4. A new type of air path low-voltage three-phase asynchronous motor according to claim 1, characterized in that: the outside of the casing (1) is provided with an outer wind cover (11), and the outer wind cover (11) is connected to the External fans (12) are installed between the casings (1).

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