Flow path switching valve

A flow path switching valve, comprising:

• a valve body including:
• an inlet pipe, a first outlet pipe, and a second outlet pipe, wherein at least one of the inlet pipe, the first outlet pipe, or second outlet pipe is disposed on one side thereof;
• an inlet hole connected to one end of the inlet pipe;
• and a first cam accommodation depression connected to one end of the first outlet pipe and a second cam accommodation depression connected to one end of the second outlet pipes;
• a first cam and a second cam respectively accommodated in the first and second cam accommodation depressions and configured to block an outflow of a gas through the first and second outlet pipes;
• a cam disk including a first cam compression protrusion configured to switch a flow path of the gas;
• a cover coupled to the valve body and covering the cam disk;
• and
• a motor disposed on the cover and configured to switch the flow path of the gas by rotating the cam disk;
• wherein the motor switches the flow path of the gas to allow the gas to flow out to an outside of a chamber when a concentration of the gas in the chamber is higher than a set value, and switches the flow path of the gas to allow the gas to flow into the chamber when the concentration of the gas in the chamber is lower than the set value,
• wherein the inlet pipe is configured to be connected to a gas tank and the first and second outlet pipes are configured to be connected to the chamber,
• wherein the cam disk is rotatable by the motor according to a supply state, a blocking state, and an emission state, such that:
• in the supply state, the first cam compression protrusion compresses the second cam so that the gas flows into the chamber through the first outlet pipe;
• in the blocking state, the first cam compression protrusion and a second cam compression protrusion respectively compress the first and second cams so that the outflow of the gas through both the first and second outlet pipes is blocked;
• and
• in the emission state, the first cam compression protrusion compresses the first cam so that the gas flows out to the outside of the chamber through the second outlet pipe.