Patent ID: 9517322
Filing Date: 2016-12-13
CPC Classification: A61M,G01F

Claim Text:
1. A flowmeter, comprising a lower valve body, a throttle valve assembly, a flow tube assembly, an upper valve body and a pressure fluctuation suppressing assembly, wherein the lower valve body is provided with an air inlet, an air outlet and an airflow passage in communication with the air inlet and the air outlet; the lower valve body is also provided with a throttle valve assembly used for adjusting the open degree of the airflow passage in the lower valve body; the flow tube assembly includes a flow tube, an upper base, a lower base and a float, wherein a ventilation hole is provided axially at the center of each of the upper base and the lower base, the lower base is arranged at the air outlet of the lower valve body, a vertical airflow passage and a horizontal airflow passage are provided within the upper valve body, the upper base is arranged at an air inlet of the vertical airflow passage in the upper valve body, the flow tube is arranged between the upper base and the lower base in such a way that protruding ends of the upper base and the lower base are inserted into both ends of the flow tube, respectively, the float is arranged within the flow tube, and the pressure fluctuation suppressing assembly comprises a sealing gasket which is arranged at an air outlet of the vertical airflow passage: a safety valve arranged on the valve body, and an air inlet of the safety valve is in communication with the horizontal airflow passage; wherein the safety valve comprises a safety valve body, a safety valve stem, a sealing ring, a spring, a stop block and a nut: a through hole is provided axially at the center of the safety valve body a stop step, on end face of which is a conical surface, is provided within the through hole along the central axis of the through hole, the safety valve stem comprises a columnar rod and a conical valve head, one end of the columnar rod is connected with the smaller end of the conical valve head, and the other end is provided with threads: the conical surface of the conical valve head is provided with an annular groove, into which a sealing ring is arranged, the safety valve stem is arranged in the safety valve body, the columnar rod of the valve stem extends through the spring, which is arranged between the stop block and the stop step through the stop block and the nut the conical valve head is in sealed contact with the conical surface of the stop step through the sealing ring arranged in the annular groove of the valve head, and the gap between the conical surface of the conical valve head and the conical surface of the stop step is in communication with the horizontal airflow passage.