Pressure detection device

A pressure detection device comprising:

• a pressure detection unit configured to detect a pressure transmitted to a pressure detecting portion;
• a flow passage unit in which a flow passage for introducing a fluid is formed;
• and
• a mounting mechanism configured to detachably mount the flow passage unit on the pressure detection unit, wherein
• the pressure detection unit includes:
• a pressure sensor including the pressure detecting portion;
• and
• a first connection portion joined to the pressure detecting portion,
• the flow passage unit includes:
• a pressure receiving portion configured to be displaced by receiving a pressure of the fluid flowing through the flow passage;
• and
• a second connection portion joined to the pressure receiving portion,
• one of the first connection portion and the second connection portion is formed of a magnet, and the other of the first connection portion and the second connection portion is formed of a magnet or a magnetic body,
• the mounting mechanism comprises a first fastening member mounted on the flow passage unit and a second fastening member mounted on the pressure detection unit,
• the first connection portion that is joined to the pressure detecting portion of the pressure detection unit and the second connection portion that is joined to the pressure receiving portion of the flow passage unit are brought into contact with each other by fastening the first fastening member to the second fastening member, and
• in a state where the flow passage unit is mounted on the pressure detection unit by the mounting mechanism, the first connection portion and the second connection portion are disposed in a state where the first connection portion and the second connection portion are attracted to and brought into contact with each other by a magnetic force,
• the second connection portion is disposed in an inner space defined by the pressure receiving portion and the pressure detecting portion,
• the first connection portion is joined to a surface of the pressure detecting portion which is not in contact with the inner space, and
• in the state where the flow passage unit is mounted on the pressure detection unit by the mounting mechanism, the first connection portion and the second connection portion are disposed in the state where the first connection portion and the second connection portion are attracted to each other by the magnetic force with the pressure detecting portion interposed between the first connection portion and the second connection portion.