Classification and main uses of explosion-proof water pump motors

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Classification and main uses of explosion-proof water pump motors 1. Main uses of explosion-proof motors: 1) Explosion-proof motors are generally used in flammable and explosive situations. ； 2) The sealing of the explosion-proof motor junction box is better than that of ordinary motors ； 3) The lowest protection level of explosion-proof motors is IP55, while ordinary motors have IPIP23, IP44, IP54, IP55, and IP56, so they can be distinguished from the appearance. ； Explosion-proof motors 2. Can be divided according to product type: 1) According to the motor principle, it can be divided into explosion-proof asynchronous motor, explosion-proof synchronous motor and explosion-proof DC motor. 2) According to the place of use, it can be divided into explosion-proof motors for coal mines and explosion-proof motors for factories. 3) It can be divided into flameproof motors, increased safety motors, positive pressure motors, non-sparking motors and dust explosion-proof motors, etc. 4) According to the supporting host machine, it can be divided into explosion-proof motors for coal mine transporters, explosion-proof motors for coal mine winches, explosion-proof motors for rock loaders, explosion-proof motors for local coal mine fans, explosion-proof motors for valves, explosion-proof motors for fans, explosion-proof marine motors, explosion-proof motors for lifting metallurgy and increased safety brushless excitation synchronous motors for hydrogenation equipment, etc. In addition, they can also be classified according to technical indicators such as rated voltage and efficiency, such as high-voltage explosion-proof motors, high-efficiency explosion-proof motors, high-slip explosion-proof motors, and high starting torque explosion-proof motors. 3. According to product series and characteristics: 1) Explosion-proof motors use a flame-proof casing to isolate the electrical parts that may produce sparks, arcs and dangerous temperatures from the surrounding gas mixture. However, this kind of shell is not sealed, and the surrounding gas mixture can enter the inside of the motor through the gaps between the joint surfaces of various parts of the shell. It may occur when it comes into contact with ignition sources such as sparks, arcs, and dangerous high temperatures in the casing. At this time, the flameproof casing of the motor will not only not be damaged or deformed, but also when the flame or hot gas spreads through the joint surface gap, it will not ignite the surrounding gas mixture. The main features of explosion-proof motors are: (1) The corresponding relationship between power, installation dimensions and rotational speed is consistent with DIN42673. At the same time, taking into account the inheritance with the YB series and the interchangeability with the Y2 series, necessary adjustments have been made to make it more effective and applicable. (2) The noise limit is lower than the YB series, close to the I noise of the YB series, and the vibration limit is equivalent to the YB series. (3) The whole series adopts F edge, and the temperature rise is assessed according to B. (4) There are two types of motor heat sinks: parallel horizontal distribution and radiation distribution, with parallel horizontal distribution being the main type. (5) The entire series uses low-noise deep groove ball bearings, and the center height of the machine base is over 180mm. The motor is equipped with an oil injection and drainage device. (6) The shell protection is improved to IP55. (7) The main performance indicators have reached the internationally advanced level in the early 1990s. 2) The increased safety motor is a motor structure that will not produce arcs, sparks or dangerous high temperatures under normal operating conditions, and then takes some mechanical, electrical and thermal protection measures to further avoid the risk of arcs, sparks or high temperatures under normal or approved overload conditions, thereby ensuring its explosion-proof safety. The characteristics of increased safety motors are:: (1) Meet the requirements for increased safety explosion-proof motors, adopt a series of reliable measures to prevent sparks, arcs and dangerous high temperatures, and can operate safely in Zone 2 hazardous locations. (2) Brushless excitation is adopted, and a rotating rectifier disk and a static excitation cabinet are installed, and the excitation control system is reliable ； The compliant switching is accurate and has no impact. ； The excitation system has reliable out-of-step protection and strong re-stepping capability. ； The circuit design is reasonable and the discharge resistor does not generate heat during operation. ； The excitation current adjustment range is wide. (3) The synchronous machine, AC exciter and rotating rectifier disk are coaxial. The rectifier disk is located between the main motor and the exciter, or outside the bearing seat. (4) Shell protection is IP54. (5) Use F edge, and the temperature rise will be assessed as B. (6) Change the traditional lower water cooling to upper water cooling, that is, the water cooler is placed on the top of the motor. (7) An increased safety moisture-proof heater is installed, fixed in the cover at the bottom of the motor, for heating and moisture-proofing during shutdown. (8) Select raw materials and leave a large margin in electrical and mechanical calculations to meet the operational reliability and temperature requirements of increased safety motors. (9) Set up complete monitoring measures ； The main junction box is equipped with an increased safety self-balancing current transformer for differential protection. ； Stator winding buried working and spare platinum thermal resistor, graduation number is Pt100 ； Set up a water leakage monitor to monitor the leakage of the water cooler ； The seat-type sliding bearings at both ends are respectively equipped with on-site temperature display instruments and remote transmission signal terminals. 3) Positive pressure motors are a type of positive pressure electrical equipment. The structural characteristics of the positive pressure motor are:: (1) Equipped with a complete ventilation system, there are no structural dead spots inside the motor that may affect ventilation. (2) The shell and pipes are made of non-combustible materials and have sufficient mechanical strength. (3) Maintain sufficient positive pressure within the shell and main pipe relative to the outside atmosphere. (4) The motor must have safety protection devices (such as time relays and flow monitors) to ensure sufficient air exchange, and must also have automatic protection or alarm devices for under-pressure in the shell. (5) The quick opening door or cover on the casing must have an interlocking device with the power supply. I currently do not have a unified series of positive pressure motor products.