| 摘要 |
A differential pressure measurement unit by the present invention is installed at a fire door and comprises an eccentric hollow body which is inserted into one side of a hole formed at the fire door by including a first eccentric hollow part and a male screw part; a valve body which opens and closes the first hollow part of the eccentric hollow body by including a second eccentric hollow body and being closely attached to a front end part of the eccentric hollow body; and a valve support body which is inserted into the other side of the hole formed at the fire door and combined with the eccentric hollow body by including a valve support protrusion supporting the valve body inside and a female screw part coupled with the male screw part of the eccentric hollow body. Air pressure between a smoke section and a non-smoke section can be measured more accurately because an air pressure measurement device can measure a difference between air pressure from the first hollow part of the eccentric hollow body and the second hollow part of the valve body and air pressure at a place where a worker is located. A pressure difference between both sections separated by the fire door can be measured without separating a portion of components. Therefore, a portion of the components is not lost, and unit price of a product is easily reduced by the simplification of the components. |
