Diaphragm pump integrally including quick discharge valve unit
A diaphragm pump includes a quick discharge valve unit that comprises a vessel including a supply passage, a check valve seat, a delivery passage and a discharge passage, and an elastic member configured to partition an internal space of the vessel into an input-side space connected to the supply passage and an output-side space connected to the delivery passage and the discharge passage. The elastic member includes a check valve body to prevent an inflow of air from the output-side space to the input-side space, and a discharge port valve body configured to close the discharge passage when air is supplied to the input-side space through the supply passage. The vessel includes a connecting path having a sectional area smaller than an area of a section of the supply passage, and configured to release pressurized air in the input-side space to an outside.
1. A diaphragm pump integrally comprising:
a diaphragm including an elastically deformable diaphragm portion;
a partition member placed on the diaphragm and forming a pump chamber together with the diaphragm portion, the partition member including a suction passage through which air to be taken into the pump chamber from an outside space of the diaphragm pump flows and an output passage through which air output from the pump chamber flows;
a driving mechanism configured to deform the diaphragm portion to expand and contract the pump chamber; and
a quick discharge valve unit formed on the partition member, and configured to deliver air output from the output passage to an external pressurization target, and discharge pressurized air remaining in the pressurization target, the quick discharge valve unit comprising:
a vessel including a first housing including a supply passage and a check valve seat through which air output from the output passage flows, and a second housing including a delivery passage through which air to be supplied to the pressurization target flows and a discharge passage which is open to the outside space; and
an elastic member partitioning an internal space of the vessel into an input-side space to which air output from the output passage is input through the supply passage, and an output-side space connected to the delivery passage and the discharge passage, the elastic member comprising:
a check valve body configured to form, together with the check valve seat, a check valve which prevents an inflow of air from the output-side space to the input-side space; and
a discharge port valve body configured to close the discharge passage when air is supplied to the input-side space through the supply passage,
wherein the first housing includes a connecting path configured to release pressurized air in the input-side space to the outside space, the connecting path having a sectional area smaller than an area of a section of the supply passage, the sectional area of the connecting path being perpendicular to a longitudinal direction of the connecting path, and the area of the section of the supply passage being perpendicular to a longitudinal direction of the supply passage.
2. The pump according to claim 1 , wherein
the partition member and the first housing form a suction space connected to the outside space through an inflow passage, the suction space connecting the suction passage to the outside space, and
the connecting path connects the input-side space and the suction space, having one end which is open in the input-side space and the other end which is open in the suction space.
3. The pump according to claim 1 , wherein the connecting path connects the input-side space and the outside space, having one end which is open in the input-side space and the other end which is open to the outside space.