Many people believe that the reason why explosion-proof electrical equipment can be explosion-proof is that its outer casing can prevent the gas with the danger of explosion from entering its interior, and its sealing performance must be very good, and it can prevent rainwater from entering. It should be no problem to install it in the open air. In fact, this is to confuse the two concepts of explosion-proof form and enclosure protection level of explosion proof vfd electrical equipment.
The vast majority of explosion-proof electrical equipment cannot prevent gas or water from entering its interior, so these explosion-proof electrical equipment cannot be directly installed in outdoor open spaces, nor can their enclosures be washed with water. In fact, the waterproof performance of the equipment is completely determined by the protection level of its shell. Usually, the protection level of the electrical equipment shell that is used for outdoor protection against rainwater should reach IPX5 (that is, it can withstand water spray from all directions without entering water). Therefore, when purchasing explosion-proof equipment When using electrical equipment, the requirements for the protection level of the enclosure must be put forward at the same time. Another point to note is that the explosion-proof electrical equipment used outdoors should be resistant to corrosion.
At present, many people still lack sufficient understanding of dust explosion-proof and dust-explosion-proof electrical equipment. In practical applications, whether it is a gas explosion-hazardous place or a dust-explosion-hazardous place, gas explosion-proof electrical equipment is selected. In fact, this is wrong, because it can be seen from the explosion-proof principle of various explosion-proof electrical equipment that the protection level of most gas explosion-proof electrical vfd frequency converter is lower than that of dust explosion-proof electrical equipment. Get inside the equipment and accumulate, which will prevent the safe operation of explosion-proof electrical equipment.
Conversely, can dust explosion-proof electrical equipment be used in gas explosion hazardous locations? the answer is negative. Because dust explosion-proof electrical equipment only has a higher shell protection level, it cannot prevent explosive gas from entering its shell, and there are no explosion-proof measures such as explosion-proof and safety enhancement, so the power control equipment company suggests that these two kinds of explosion-proof electrical equipment must not be used interchangeably.
This is a common misunderstanding in the vast rural areas. In fact, there are four types of dust that are explosive and dangerous: explosive dust, combustible conductive dust, combustible non-conductive dust and combustible fiber. Agricultural dust is classified as combustible non-conductive dust. Taking barley flour as an example, its various explosion hazard indicators are actually equivalent to the red phosphorus powder in the metal. Therefore, the explosion-proof problem of agricultural product crushing and processing places must be paid enough attention, and explosion-proof electrical equipment must be selected.