What are the precautions for using and maintaining explosion-proof motors?
2022-04-24 09:46
Explosion-proof motor Compared with ordinary motors, the structural features of explosion-proof motors are that the contact surfaces between the bracket and the end cover, junction box, junction box floor, cover plate, and other combined parts are all set as explosion-proof surfaces. The joint surface of the explosion-proof motor and the ordinary motor has no substantial difference, but in order to meet the higher sealing requirements, the fitting area (such as longer cracks) is increased, and the fitting accuracy is improved. Sealing agents and rubber seals are used in this part. In addition, the junction box must also be tightly isolated from the inside of the shell, which is generally not paid attention to by ordinary motors. In order to prevent the pressure of the "explosion" inside the motor from detonating the shell, the strength of the materials used for the bracket, end cover, and junction box must be high, and the thickness must be large. In addition, these parts have also undergone pressure tests (generally internal resistance tests), and only after passing the test can they be assembled.
A sparkless motor is a motor that will not ignite surrounding explosive mixtures under normal operating conditions and generally will not experience ignition failures. Compared with increased safety motors, except for the insulation medium strength test voltage, winding temperature rise, te (the time for the AC winding to reach the rated final operating temperature at the highest ambient temperature), and the starting current ratio are not specially stipulated like increased safety motors, the design requirements are the same as those of increased safety motors.
Explosion-proof motor What are the usage and maintenance precautions? Let's take a brief look together.
(1) The type of explosion-proof motor should be selected according to the usage environment. (2) Strictly set short-circuit, overload, overheat, and insufficient protection as needed, and regularly check whether these protective devices are effective. (3) Non-professionals are strictly prohibited from disassembling any part of the motor. (4) The power cord should be connected according to the following steps: After removing the junction box cover, loosen the junction box cover, remove the rubber gasket at the junction box entrance, and clamp the two parts on the cable.
Explosion-proof motor What needs to be noted? Let's take a brief look together.
The inner hole of the rubber gasket must be the same as the outer diameter of the cable, and there cannot be a large gap. Otherwise, when pressing the wiring pipe, the rubber gasket and the cable will not be sealed, so when an explosion occurs in the junction box, the motor will explode externally, thus losing its explosion-proof function. Insert the cable at the junction box entrance into the box, wrap the three cores around the corresponding terminals respectively (mining motors must wrap the grounding core around the grounding screw), each core must be pressed into a circle within two arched gaskets, and tighten the terminal nut. After the cable is connected, install the rubber gasket. Install the junction box, tighten the screws, press the rubber ring against the end face of the connection end, and make the cable completely engaged.
If disassembly is required, special attention should be paid to protecting the explosion-proof surface and windings from impact. If multiple units are disassembled at the same time, the disassembled parts should be stored separately and should not be confused. If the disassembled parts are kept for a period of time, necessary rust prevention treatment should be carried out on the explosion-proof surface.
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