초록 ▼

A control device is provided with a switching valve mechanism and first and second actuators. The switching valve mechanism is provided with a valve element for switching which is located within a casing. The valve element can linearly move between an open position at which first and second pressure

A control device is provided with a switching valve mechanism and first and second actuators. The switching valve mechanism is provided with a valve element for switching which is located within a casing. The valve element can linearly move between an open position at which first and second pressure change chambers of the casing are communicated with each other and a closed position at which the communication is interrupted. The valve element is held at the open position and the closed position by a first holding mechanism (toggle spring). When a float ascends to a first water level, the first actuator moves the valve element from the closed position to the open position. When the degree of vacuum within a pressure detection chamber becomes a second degree of vacuum or less, the second actuator moves the valve element from the open position to the closed position.

대표청구항 ▼

1. A control apparatus of a vacuum valve which is interposed between one end of a water suction pipe having the other end open to a water storage basin, and a vacuum-sucked vacuum water supply pipe, the vacuum valve being opened when a degree of vacuum within a pressure chamber becomes equal to or m

1. A control apparatus of a vacuum valve which is interposed between one end of a water suction pipe having the other end open to a water storage basin, and a vacuum-sucked vacuum water supply pipe, the vacuum valve being opened when a degree of vacuum within a pressure chamber becomes equal to or more than a first degree of vacuum and closed when the degree of vacuum within the pressure chamber becomes lower than the first degree of vacuum, the control apparatus of the vacuum valve comprising: a switching valve mechanism having a casing formed with a first pressure change chamber communicated with the vacuum water supply pipe and a second pressure change chamber communicated with a pressure chamber of the vacuum valve, a switching valve body arranged within the casing so as to be linearly movable between an open position where the first pressure change chamber is communicated with the second pressure change chamber, and a closed position where the communication between the first pressure change chamber and the second pressure change chamber is shut off, and a first retention mechanism retaining the switching valve body at the open position and the closed position by a previously set retention force;a first actuator having an opening actuation member that is attached to the casing of the switching valve mechanism so as to be linearly movable along a linear moving direction of the switching valve body in conjunction with ascent and descent corresponding to a water level of a float accommodated within the water storage basin, the opening actuation member moving the switching valve body from the closed position to the open position against the retention force of the first retention mechanism when the float ascends to a previously set first water level; anda second actuator having a switching cylinder that is attached to the casing and is formed with a pressure detection chamber communicated with the vacuum water supply pipe in an inner portion thereof, and a closing actuation member that is linearly movable in the linear moving direction of the switching valve body, the closing actuation member advancing so as to move the switching valve body from the open position to the closed position against the retention force of the first retention mechanism when a degree of vacuum within the pressure detection chamber becomes equal to or less than a second degree of vacuum. 2. The control apparatus of a vacuum valve according to claim 1, wherein the second pressure change chamber of the casing of the switching valve mechanism is provided with a seal member that has a through hole communicating with ambient air, andthe switching valve body blocks the through hole of the seal member in a state of being moved to the open position so as to shut off the second pressure change chamber from the ambient air, and opens the through hole of the seal member in a state of being moved to the closed position so as to communicate the second pressure change chamber with the ambient air. 3. The control apparatus of a vacuum valve according to claim 1, wherein a force for moving the switching valve body from the open position to the closed position by the closing actuation member of the second actuator is made larger than buoyancy of the float. 4. The control apparatus of a vacuum valve according to claim 3, wherein the switching cylinder of the second actuator includes:a switching piston cup that is arranged within the pressure detection chamber; anda biasing spring that is contracted by a pressing force caused by a movement of the switching piston cup when the degree of vacuum within the pressure detection chamber becomes higher than the second degree of vacuum, and is expanded against the pressing force of the switching piston cup when the degree of vacuum within the pressure detection chamber becomes equal to or less than the second degree of vacuum, andthe closing actuation member is connected to the switching piston cup, and the switching valve body is moved from the open position to the closed position by the biasing force of the biasing spring. 5. The control apparatus of a vacuum valve according to claim 4, wherein the second actuator further includes a retention auxiliary mechanism that retains a state in which the biasing spring is contracted via the switching piston cup by a weaker force than the biasing force of the biasing spring. 6. The control apparatus of a vacuum valve according to claim 5, wherein the vacuum valve includes:a water shut-off cylinder that has an inner portion partitioned into the pressure chamber and a reference pressure chamber retained at a predetermined pressure, and has a water shut-off piston cup arranged within the pressure chamber, and a biasing spring contracted by a pressing force caused by a movement of the water shut-off piston cup when the degree of vacuum within the pressure chamber becomes equal to or more than the first degree of vacuum, and expanded against the pressure force of the water shut-off piston cup when the degree of vacuum within the pressure chamber becomes lower than the first degree of vacuum;an opening and closing actuation member that is connected to the water shut-off piston cup, moves a water shut-off valve body to an open position based on the contraction of the biasing spring, and moves the water shut-off valve body to a closed position by expansion of the biasing spring; anda retention auxiliary mechanism that retains a state in which the biasing spring is contracted via the water shut-off piston cup with a force weaker than the biasing force of the biasing spring. 7. The control apparatus of a vacuum valve according to claim 1, wherein the switching cylinder of the second actuator is partitioned into the pressure detection chamber and a reference pressure chamber retained at a predetermined pressure, andthe closing actuation member moves the switching valve body from the open position to the closed position when the degree of vacuum within the pressure detection chamber becomes equal to or less than the second degree of vacuum that is lower than the reference pressure within the reference pressure chamber. 8. The control apparatus of a vacuum valve according to claim 1, wherein the second degree of vacuum by which the second actuator advances so as to move the switching valve body to the closed position is set higher than the first degree of vacuum by which the vacuum valve is actuated so as to open and close. 9. The control apparatus of a vacuum valve according to claim 1, wherein the second degree of vacuum by which the second actuator advances so as to move the switching valve body to the closed position is set lower than the first degree of vacuum by which the vacuum valve is actuated so as to open and close, anda check valve is arranged in a connection piping that connects the first pressure change chamber of the casing of the switching valve mechanism and the vacuum water supply pipe, the check valve allowing a fluid movement from the first pressure change chamber to the vacuum water supply pipe and inhibiting an opposite fluid movement. 10. The control apparatus of a vacuum valve according to claim 1, wherein the second actuator has a second retention mechanism that retains the closing actuation member at an advanced position and a retreated position by a previously set retention force. 11. The control apparatus of a vacuum valve according to claim 10, wherein the second retention mechanism includes a toggle spring that biases the closing actuation member toward an axis from an outer side, andthe closing actuation member is provided with a retention member that has a first spring retention portion retaining an end portion of the toggle spring, and a second spring retention portion retaining the end portion of the toggle spring in an outer side of the first spring retention portion, and the retention force of the closing actuation member is made changeable by selectively making the first and second spring retention portions retain the toggle spring. 12. The control apparatus of a vacuum valve according to claim 1, wherein a seal portion of a valve gasket of the switching valve body that shuts off communication between the first pressure change chamber and the second pressure change chamber of the casing of the switching valve mechanism has in a part thereof a high rigidity portion with rigidity higher than other parts, as seen from a moving direction of the switching valve body.