Wuxi Lanhai Electric Motor Co.,Ltd
Add: 4#, Tianshi Road Shitangwan Town, Wuxi, Jiangsu, China
Development Situation of Marine Explosion-proof Motor in China
In China's economic industry, the industrial economy occupies a large proportion. But in the industrial work environment, many production sites will produce some flammable substances. For example, there are about two-thirds of the coal mine where there are explosive substances; chemical industry, about 80% of the production workshop area there are explosive substances. Oxygen: Oxygen in the air is ubiquitous. Therefore, in the production process a lot of use of electrical instruments, all kinds of friction of the spark, mechanical wear sparks, static sparks, high temperature and so on, especially when the instrument, electrical failure.
Objectively many industrial sites meet the conditions of the explosion. When the explosive concentration of explosive substances and oxygen in the explosion limit range, if there is explosion source, will explode. In this environment, the work of the motor on the need for marine explosion-proof motor, so marine explosion-proof motor came into being.
Of course, marine explosion-proof motors are mainly used for coal mines, oil and gas, of course, petrochemical and chemical industries. In addition, in the textile, metallurgy, city gas, transportation, grain and oil processing, paper, medicine and other departments are also widely used. Marine explosion-proof motors as the main power equipment, usually used to drive pumps, fans, compressors and other transmission machinery.
With the development of science and technology, the development of production, there are places of explosion danger is also increasing. For example, edible oil production in the past is the traditional press method, the 20th century, 70 years later, China began to introduce advanced foreign leaching oil process, but the process to use the chemical solvent containing hexane, hexane is flammable and explosive Material; so leaking oil shop has become a dangerous place of explosion, the need to use marine explosion-proof motor and other explosion-proof electrical products. Another example, in recent years, China's rapid development of roads, a large number of fuel stations appear, this way to the marine explosion-proof motor to provide a new market. I believe in recent years, marine explosion-proof motor market will quickly develop.
We use the continuous working system (S1 working system) motor as the introduction of the object, because the motor explosion-proof shell can withstand any joint through the shell or structural gap to penetrate into the interior of the combustible mixture inside the explosion without damage, and will not cause the external Of the explosive gas mixture of the risk of ignition, so the type of motor surface temperature test location is limited to the outer surface of the motor base and bearing outer ring. Other types of explosion-proof motors, such as safety-enhanced or non-spark-type motor housings, do not have the protection characteristics of the flameproof enclosure, and the maximum surface temperature test position should also increase the test of the motor rotor surface. Normally, the surface temperature of the rotor is significantly higher than that of the outer surface of the base due to the difference in thermal conductivity and heat dissipation between the inside and the outside of the motor. Therefore, the maximum surface temperature of the two types of explosion-proof motors depends mainly on the rotor surface temperature.
We often use the motor temperature measurement methods are the following four: ① thermometer method; ② resistance method; ③ embedded thermometer method; ④ paste temperature measurement paper method. The temperature test described here is based on the first method described above. The temperature sensor is easier for the laboratory to produce, low cost, and easy to calibrate the copper-kon copper thermocouple. The hotspot is numbered T-type with a test temperature range of - 200 ~ 400 ℃ between. It can directly change the temperature signal into a certain law of the weak voltage signal, through one or two A / D conversion card, and PC directly connected to the use of specialized matching temperature test software, you can test 8 points or 16 points Different locations of the temperature, and the computer display directly on all the test points of the current and historical temperature or temperature curve. The A / D converter card for the intelligent ISA bus, with optocoupler isolation, anti-interference ability, high precision (± 0.05%) high reliability. Due to the large thermal inertia of the temperature field and the temperature sensor, the minimum interval of the set of data is set to 3 s to meet most of the test requirements, which is also applicable for motor temperature tests.