Research on the technology of remote control of balance dampers with large section and large differential pressure

As coal mining progresses to greater depths, the application of balance dampers as important ventilation facilities underground is becoming increasingly widespread. However, when there is a large differential pressure between the two sides of a large section damper, it can cause a series of problems and easily damage the damper. In order to address this issue, the balance dampers are redesigned to incorporate additional functions, including anti-deformation, three-dimensional adjust ability, in-situ intelligent control, and remote unlocking of short-circuit smoke evacuation. The research results show that despite maintaining the same external dimensions, the weight of the newly designed damper has been reduced by approximately 50%, while its strength has been enhanced and it is now capable of accommodating roadway deformations of up to 200 mm. A numerical simulation is conducted to assess the performance of the three components, including the door fan, door frame, and windward surface. It is found that under a load of 16 000 N, the door fan experiences local failure, and the maximum displacement occurres on the loading surface of the door fan at the farthest distance from the hinge axis.When the pressure around the roadway causes the maximum deformation of the door fan to reach 200 mm, the damper can still withstand a pressure of 3 000 N without any failure. When the underground wind pressure reaches 1 000 Pa, the maximum displacement occurs at the lower right corner of the load bearing surface of the left door leaf, resulting in local failure, but it does not affect the use of the damper. Following the field test, the balance dampers can be used as intended, meeting the demand for wind regulation under certain mine pressure and high wind pressure. The results demonstrate that this new type of balanced damper with remote automatic control function and large section and large differential pressure can improve the stability of the damper, enhance the stability of the system.