Sensor mounting structure

A sensor mounting structure for mounting on a flow passage body including a flow passage and a flow passage opening connected to the flow passage a fluid pressure sensor including a sensor main body, the sensor mounting structure allowing the fluid pressure sensor to measure a pressure of a fluid flowing in the flow passage, the sensor mounting structure comprising:

• an accommodation unit which is open to an upper side of the flow passage body and accommodates at least a part of the fluid pressure sensor therein;
• a sensor case;
• and
• a screw member that fixes the sensor case to the flow passage body, wherein
• the sensor case covers the sensor main body,
• the sensor case comprises a sensing hole, which is connected to the flow passage opening exposed to an inside of the accommodation unit in a state where the fluid pressure sensor is mounted on the flow passage body, in a lower surface of the sensor case, wherein
• the sensor case comprises:
• a columnar portion disposed along a center axis extending in an up-and-down direction, and
• a flange portion which protrudes from the columnar portion to a radially outer side and is accommodated in the accommodation unit, wherein
• the accommodation unit comprises a female screw provided in a radially inside surface of the accommodation unit, wherein
• the screw member comprises
• a hole portion which is recessed from a lower end portion of the screw member in an upward direction and into which at least a part of the columnar portion is inserted, and
• a male screw which is provided in a radially outside surface of the screw member and is screwed into the female screw,
• wherein the screw member is disposed to be opposed to an upper side of the flange portion, and wherein
• the screw member further includes:
• a screw member main body which includes the male screw, and
• a prismatic screw head which is connected to an upper end portion of the screw member main body and is located above the accommodation unit.