Evacuation apparatus
An evacuation device, gas technology, used in liquid variable volume machinery, liquid fuel engines, machines/engines, etc.
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[0052] Then, a second embodiment will be described.
[0053] In this second embodiment, the elapsed time signal from the timer 42, rather than the pressure signal from the pressure sensor 40, switches the on / off state of the pumps 5 and 3, and also the on / off valve 34 and 39 on / off state conversion.
[0054] The time t1 is predetermined by calculation based on conditions such as the volume of the vacuum tank 7, the discharge capacity of the compression space 25 of the mechanical booster pump 5, specific operating factors of the mechanical booster pump 5, ambient temperature, etc. t1 is the time required for pressure P0 to drop to pressure P1 (medium vacuum).
[0055] When the controller recognizes that the time t1 has passed the time t0 through the signal from the timer 42, the controller controls the operating state so that the mechanical booster pump 5 is in the on state, the booster pump 3 is in the on state, and the first on The on / off valve 34 is in an open state, and t...
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