Flameproof three-phase asynchronous motor with high energy efficiency

Abstract

The invention discloses a flameproof three-phase asynchronous motor with high energy efficiency, the flameproof three-phase asynchronous motor includes a base, a stator mounted in the base and a rotormounted in cooperation with the stator, the rotor is fixedly mounted on a rotating shaft, the front and rear ends of the frame are respectively provided with end caps, bearings are arranged between the end caps and the rotating shaft, and the bearing inner cover and the bearing outer cover are respectively correspondingly arranged on the inner and outer sides of the bearing, and a connecting boxis also arranged at the outlet of the machine base, the bearing inner cover and the rotating shaft are closely matched to form an inner flameproof passage structure, the bearing outer cover and the rotating shaft are closely matched to form an outer flameproof passage structure, and the bearing outer cover is provided with an oil seal which is in an interference-fit relation with the rotating shaft; a spigot flameproof surface is formed at the matching part between the end cover and the machine base; the rotor is a cast aluminum rotor with a double squirrel cage structure, the surface of the rotor guide bar is provided with an insulating layer, and a gap is reserved between the rotor guide bar and the corresponding rotor groove. The flameproof three-phase asynchronous motor of the invention has reasonable structure, safety and reliability, and is convenient for users to use.

Description

Technical field [0001] The invention relates to the technical field of explosion-proof motors, in particular to a high-energy-efficiency explosion-proof three-phase asynchronous motor. Background technique [0002] Conventional domestic explosion-proof motors only meet the energy efficiency level 3 and level 2 in GB18613-2012, and cannot meet the current demand for high-efficiency motors in explosion-proof places such as petrochemicals. In addition, the conventional explosion-proof motors have only IP54 and IP55 protection levels, which cannot meet the requirements of high protection. At the same time, the locked-rotor current is relatively large and cannot meet the user's requirements of not more than 7 times the rated current. The specific problems are as follows: [0003] 1. The energy efficiency grade is only to reach the level 3 energy efficiency and the level 2 energy efficiency; [0004] 2. The protection level is low, only reaching IP54, IP55, but not meeting the requirement...

AI Technical Summary

Problems solved by technology

[0002] Domestic conventional explosion-proof motors only meet the energy efficiency of level 3 and level 2 in GB18613-2012, which cannot meet the current demand for high-efficiency motors in explosion-proof places such as petrochemical industries

In addition, the protection level of conventional explosion-proof motors is only IP54 and IP55, which cannot meet the requirements of high protection. At the same time, the locked-rotor current is relatively large, which cannot meet the requirements of users not to exceed 7 times the rated current. The specific problems are as follows:

[0003] 1. The energy efficiency level only reaches level 3 energy efficiency and level 2 energy efficiency;

[0004] 2. The protection level is low, it can only reach IP54, IP55, and cannot meet the requirements of IP66 protection level;

[0005] 3. The outline of the heat sink is circular, and the heat dissipation capacity is not fully utilized;

[0006] 4. The starting current is large, which cannot meet the requirements of the whole series not exceeding the rated current;

[0007] 5. Using the connection method of terminal bolts, there is a situation that the crimping is not tight and the lead wires are burned;

[0008] 6. The outer diameter of the adaptable cable is discrete, not continuous. Due to the large deviation of the outer diameter of the cables produced by various manufacturers, there is a hidden danger of explosion in practical applications;

[0009] 7. The wiring cavity is small, which makes it difficult to connect the user's cable;

[0011] 9. Poor oil drainage, long-term operation, too much oil in the cavity of the bearing chamber, resulting in high bearing temperature

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