In the design and application of bag-type dust collectors, compressive strength is a key indicator, which is mentioned in product samples both at home and abroad. Most bag-type dust collectors operate under negative pressure conditions. In such cases, if the stiffness of the dust collector housing is insufficient, the phenomenon of wall panel inward depression is likely to occur. When the pressure is released and the wall panel rebounds, a "bang" sound will be heard, and this deformation can be detected by the naked eye. Based on this, the industry defines the compressive strength of bag-type dust collectors as the static pressure value corresponding to any visible deformation of the dust - filtering box during the operation process. This indicator is an important consideration factor that cannot be ignored in the design of dust collectors.
In terms of numerical requirements, the compressive strength of the dust collector should be greater than 1.2 times the total pressure value of the fan and also greater than 1.2 times the maximum load pressure. Although under normal working conditions, the working pressure of the dust collector is less than the total pressure value of the fan, in actual operation, abnormal working conditions such as blockage of the dust-removal pipeline may occur. Once such situations happen, the internal pressure of the dust collector will rise sharply. Therefore, to ensure the safe and stable operation of the dust collector under various working conditions, sufficient compressive strength must be given to it during the design and manufacturing process, and dust collector accessories play a crucial role in this regard.
The various accessories of the dust collector are interrelated and jointly affect the compressive strength of the dust collector. For example, the electromagnetic pulse valve and the pulse controller are a closely-cooperating pair of components. As the "brain" of the dust-cleaning system, the pulse controller accurately sends signals to the electromagnetic pulse valve according to a pre-set program, controlling its opening and closing time and frequency. The electromagnetic pulse valve, as an executive component, instantly opens upon receiving the signal, spraying high-speed compressed air into the filter bag to achieve dust cleaning. If the pulse controller malfunctions and sends incorrect signals, causing the electromagnetic pulse valve to open for too long or at too high a frequency, the internal pressure of the dust collector will fluctuate significantly and frequently. This not only damages the electromagnetic pulse valve itself but may also affect the stability of the filter bag, thus threatening the compressive strength of the dust collector.
The filter bag, as an accessory that directly contacts the dust and gas, also has a close relationship with the electromagnetic pulse valve. During the dust-cleaning process, the compressed air blown by the electromagnetic pulse valve impacts the filter bag, causing the filter bag to expand and contract instantaneously. If the material and structure of the filter bag cannot withstand this periodic pressure change, it is prone to damage. Once the filter bag is damaged, the dust-containing gas will leak, disrupting the air-flow distribution and pressure balance inside the dust collector, ultimately affecting the compressive performance of the dust collector.
In addition, if the dust and gas processed by the dust collector have potential risks of combustion and explosion, the requirements for the compressive and explosion-proof performance of these accessories will be even higher. Each accessory not only needs to have good compressive and explosion-proof capabilities itself, but also the adaptability between them is of vital importance. For example, an explosion-proof electromagnetic pulse valve needs to work in coordination with a pulse controller that can adapt to high-risk environments, and be equipped with filter bags with flame - retardant and anti-static properties to jointly ensure the safe and stable operation of the dust collector under special working conditions. It should be noted that the current standards do not make clear regulations for these special situations. Therefore, during the design and use of the dust collector, relevant personnel must attach great importance to these issues and ensure the safety performance of the dust collector through rigorous calculations and reasonable designs.
