| 摘要 |
The present invention relates to a differential pressure measuring device installed on a fire door, comprises: a male screw body which includes a hollow part and a male screw part, and is inserted into one side of a hole formed on the fire door; a female screw body which includes a circumference vent hole on a circumferential surface of a female screw head formed on an end of one side of the female screw body and a female screw part, and is inserted into the other side of the hole formed on the fire door to be coupled to the male screw body; and an opening and closing unit which opens and closes the circumference vent hole of the female screw body. According to the present invention, since the circumference vent hole, which is formed on a circumference of the female screw head of the female screw body, is opened and closed using the opening and closing unit, a structure of the opening and closing unit, which is relatively small in comparison to other components, can be simplified, thereby reducing the number of manufacturing processes of the differential pressure measuring device. In addition, the differential pressure measuring device can be assembled to be smaller than a stroke length of a valve body in Korean Patent Applications 10-2012-0138654 and 10-2012-0150501 invented by the applicant of the present invention, thereby providing ease of assembly. |
