Pressure switch with two pressing members and a hermetic electric compressor arrangement therewith

A pressure switch comprising:

• a pressure-resistant container made of metal and having airtightness, the pressure-resistant container including a container body and a cover plate that airtightly closes an opening side of the container body;
• a contact assembly that is made of metal, is provided inside the pressure-resistant container, is normally in a closed state, and is brought into an open state when a pressing force is applied;
• at least one airtight terminal that is made of metal, is provided through the pressure-resistant container, and is connected to the contact assembly;
• a diaphragm that is made of metal, is provided airtightly on a first end surface part as an end surface part of the pressure-resistant container, is operated at a first operating pressure, and is restorable at a restoring pressure lower than the first operating pressure;
• a first push rod that is provided through the first end surface part, and presses the contact assembly due to the operation of the diaphragm and switches the contact assembly to the open state;
• a cup-shaped metal shell that is made of metal, is airtightly provided on a second end surface part different from the first end surface part of end surface parts of the pressure-resistant container, is deformed and operated at a second operating pressure higher than the first operating pressure, and is not restored even when the pressure decreases to atmospheric pressure after the operation at the second operating pressure;
• and
• a second push rod that is provided through the second end surface part, and presses the contact assembly due to the operation of the cup-shaped metal shell and switches the contact assembly to the open state, wherein
• the first push rod and the second push rod are composed of an inorganic material without containing any organic material, and
• in a state where the cup-shaped metal shell is not operated, a part of the second push rod is housed in a space surrounded by the cover plate and the cup-shaped metal shell, and a remaining part of the second push rod is housed in a through hole formed in the cover plate.