Flow path switching valve
There is provided a flow path switching valve. The flow path switching valve includes: a valve body having an inlet pipe and first and second outlet pipes and including an inlet hole and first and second cam accommodation depressions; first and second cams accommodated in the first and second cam accommodation depressions, respectively, and configured to block the outflow of a specific gas; a cam disk including a first and second cam compression protrusion configured to switch the flow path of the specific gas by compressing at least one of the first and second cams and a first or second cam compression protrusion configured to block the outflow of the specific gas by compressing one of the first and second cams; a cover coupled to the valve body while covering the cam disk; and a motor provided on the cover, and configured to switch the flow path.
1 . 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.
2 . The flow path switching valve of claim 1 , further comprising a first cam spring and a second cam spring, respectively configured to accommodate portions of the first and second cams in order to provide elastic force to the first and second cams while being respectively accommodated in the first and second cam accommodation depressions.
3 . The flow path switching valve of claim 1 , further comprising a motor O-ring fitted over a shaft of the motor and disposed between the cam disk and the cover.
4 . The flow path switching valve of claim 1 , wherein the motor is an electric geared motor.
5 . The flow path switching valve of claim 1 , further comprising a first cam rubber and a second cam rubber, respectively disposed between the first and second cams and the first and second outlet pipes in order to increase sealing force for the first and second outlet pipes while being respectively accommodated in the first and second cam accommodation depressions.