Wuxi Lanhai Electric Motor Co.,Ltd
Add: 4#, Tianshi Road Shitangwan Town, Wuxi, Jiangsu, China
Explosion - proof Motor in the domestic development situation
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. So in the production process a lot of use of electrical instruments, all kinds of friction of the spark, Motor 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 need for explosion-proof Motor Motor, so explosion-proof Motor came into being.
Of course, explosion-proof motor is mainly used for coal mines, oil and gas, of course, oil and chemical industry. In addition, in the textile, metallurgy, city gas, transportation, grain and oil processing, paper, medicine and other departments are also widely used. Explosion-proof motor 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 is an increasing risk of explosion. For example, edible oil production in the past is the traditional press method, after the 20th century, 70 years, China began to introduce advanced foreign leaching oil process, but this 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, need to use 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 explosion-proof Motor to provide a new market. I believe in recent years, explosion-proof Motor market will quickly develop.
We use the continuous working system as the introduction of the object, because the Motor explosion-proof shell can withstand any joint through the shell or the structure of the gap into the interior of the combustible mixture within the explosion and no damage, and does not cause the external explosive gas mixture Ignite the danger, so the type of Motor surface temperature test location limited to the outer surface of the Motor base and bearing outer ring. And other explosion-proof type Motor, such as increased safety or no spark-type Motor shell does not have the protection characteristics of flameproof shell, the highest surface temperature test position should also increase the motor rotor surface test. Normally, the maximum surface temperature of the two types of explosion-proof motors depends on the rotor surface temperature due to the difference in thermal conductivity and heat dissipation between the inside and outside of the motor.
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 uses the first method described above, the temperature sensor is easier for the laboratory to produce, low price, easy to calibrate the copper-kang copper thermocouple, the hot spot is T-type, the test temperature range in the - 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 in the computer display directly on all test points 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 set of data for a set of data sets is set to 3 s to meet most of the test requirements and is applicable to motor temperature tests.