Rapid-discharge-valve structural body and diaphragm pump

1. A rapid-discharge-valve structural body comprising:

a vessel including a supply passage through which a gas is supplied from a source external to the rapid-discharge-valve structural body, a discharge passage configured to discharge the gas to an object to be pressurized, and an exhaust port configured to exhaust the gas in the vessel to the outside;

a rapid discharge valve installed in the vessel, the rapid discharge valve including an exhaust port valve body configured to partition an internal space of the vessel into an input-side space including the supply passage and an output-side space including the discharge passage and the exhaust port, and close the exhaust port when a a gas is supplied through the supply passage into the input-side space;

a communication passage configured to allow the input-side space and the output-side space to communicate with each other; and

a flow rate controller configure to when a gas is supplied through the supply passage into the input-side space, allow the gas to flow from the input-side space to the output-side space in accordance with a flow rate of the gas to be supplied to the supply passage, and, when no gas is supplied through the supply passage into the input-side space, prevent a flow of a gas from the output-side space to the input-side space,

wherein the flow rate controller comprises:

a cylindrical check valve body having a truncated conical shape, the cylindrical check valve body integrated with the rapid discharge valve together with the exhaust port valve body, and supported at lower-bottom end portion thereof; and

a columnar check valve seat standing in the input-side space toward the output-side space, and inserted into the check valve body, the columnar check valve seat having a distal-end circumferential surface abutting against an upper-bottom end portion of the check valve body, and a proximal-end circumferential surface apart from the lower-bottom end portion of the check valve body.

2. The rapid-discharge-valve structural body according to claim 1 , wherein the communication passage comprises a projection projecting from the input-side space to the output-side space, and a communication hole which has an inner diameter larger than an outer diameter of the projection and with which the projection engages.

3. The rapid-discharge-valve structural body according to claim 1 , wherein the communication passage comprises a groove formed in a circumferential surface of the check valve seat.

4. A diaphragm pump comprising:

a pump chamber formed by a diaphragm including a diaphragm portion;

a diaphragm holder configured to hold the diaphragm;

a partition arranged on the diaphragm holder;

a rapid-discharge-valve structural body arranged on the partition; and

a driving mechanism configured to expand and contract the pump chamber by deforming the diaphragm portion,

wherein the partition includes a suction passage configured to allow the pump chamber to suck a gas, and an output passage configured to output the gas from the pump chamber,

the diaphragm holder, the partition, and the rapid-discharge-valve structural body are integrated in a stacked state, and

the rapid-discharge-valve structural body comprises:

a vessel including a supply passage through which the gas output through the output passage is supplied, a discharge passage configured to discharge the gas to an object to be pressurized, and an exhaust port configured to exhaust an internal gas outside of the diaphragm pump;

a rapid discharge valve installed in the vessel, and including an exhaust port valve body configured to partition an internal space of the vessel into an input-side space including the supply passage and output-side space including the discharge passage and the exhaust port, and close the exhaust port when a gas is supplied through the supply passage into the input-side space;

a communication passage configured to allow the input-side space and the output-side space to communicate with each other, and

a flow rate controller configured to, when a gas is supplied through the supply passage into the input-side space, allow the gas to flow from the input-side space to the output-side space in accordance with a flow rate of the gas to be supplied to the supply passage, and, when no gas is supplied through the supply passage into the input-side space, prevent a flow of a gas from the output-side space to the input-side space,

wherein the flow rate controller comprises:

a cylindrical check valve body having a truncated conical shape, the cylindrical check valve body integrated with the rapid discharge valve together with the exhaust port valve body, and supported at lower-bottom end portion thereof; and

a columnar check valve seat standing in the input-side space toward the output-side space, and inserted into the check valve body, the columnar check valve seat having a distal-end circumferential surface abutting against an upper-bottom end portion of the check valve body, and a proximal-end circumferential surface apart from the lower-bottom end portion of the check valve body.

5. The diaphragm pump according to claim 4 , wherein the communication passage comprises a projection projecting from the input-side space to the output-side space, and a communication hole which has an inner diameter larger than an outer diameter of the projection and with which the projection engages.

6. The diaphragm pump according to claim 4 , wherein the communication passage comprises a groove formed in a circumferential surface of the check valve seat.