Although explosion-proof electrical products in our country have been developing for so many years, there has been almost no significant improvement in their structure and quality. It is an undeniable fact that our product performance is lagging behind. In foreign countries, many products have advanced structures and processes that are refreshing to us, but our products have not made significant improvements for decades. The root cause is due to our outdated processes, equipment, and product technology. Many companies are unwilling to increase investment in technology, tooling, and new product development, satisfied with the status quo, while others simply do not want to improve their products, models, and improvements, and only pursue immediate benefits. In addition, our products do not pay much attention to the appearance design and processing, and the products we produce are always rough and unattractive. In fact, with just a little effort, we can definitely do better. In addition, there are many unreasonable phenomena in the structure of explosion-proof electrical appliances in China.

For example, the explosion-proof surface between the lampshade and the shell of an explosion-proof lamp generally adopts a two-point fastening and one point folding structure. If the diameter of a lamp is 150 millimeters and its circumference is over 450 millimeters, can the explosion-proof surface meet the requirements after tightening? According to the investigation, such a structure has a 100% gap that is out of tolerance. Some manufacturers, in pursuit of small size (material saving), make the space inside the shell very small, barely able to fit the components inside, and some have reached the point where it is extremely difficult to change the line. Such a small space is extremely detrimental to both electrical performance and product performance. Some manufacturers do not have strict requirements for the conditions that affect the explosion-proof surface, explosion-proof gap, surface roughness, and explosion-proof surface length in explosion-proof products, and there are many problems.

For example, the length from the screw hole to the edge of the explosion-proof joint surface, the design and processing of blind holes, the flatness of the explosion-proof surface, and the treatment of surface sand holes. Moreover, what was supposed to be a blind hole was actually processed into a through hole. There is also the issue of observation windows. Originally, the observation windows of explosion-proof electrical products were a weak link, and there are stricter regulations in the standards. However, many manufacturers can use glue to stick the transparent parts on. As for whether it meets the requirements, it is unknown. There are many similar issues. The main aspects can be summarized as follows:

1. The fastening bolts between the explosion-proof product cover and the main chamber have a distance of over 200 millimeters, making it difficult to ensure the explosion-proof gap and pass the explosion test.

2. Explosion proof transformers are usually made by installing ordinary transformers inside explosion-proof enclosures. After installing the transformer in an explosion-proof enclosure, with the change of heat dissipation conditions, without considering its temperature rise, short circuit, insulation and other issues, only an explosion-proof enclosure was added.

3. For the insertion and extraction device, there is a lack of requirements for insertion force, contact resistance, and arc extinguishing.

4. Many explosion-proof heating products, such as electric heaters and electric heaters, become explosion-proof products simply by adding an explosion-proof junction box to ordinary products.

5. Fan products are also the same as the above, except that ordinary fans are equipped with explosion-proof junction boxes to become explosion-proof products. It should be pointed out that the main component, the motor, should also be explosion-proof.