Patent ID: 7326038
Filing Date: 2008-02-05
Classification: F04B

Abstract:
1. A pressure switch mechanism comprising: a pressure vessel; a pressure sensor which senses a pressure within the pressure vessel at a predetermined time interval ΔT a load; a switching unit which switches a feed line of the load; and a control unit which controls the switching unit in accordance with a signal of the pressure sensor, wherein the control unit controls said switching unit in one of a first mode and a second mode depending on a pressure change rate within the time interval ΔT wherein said first mode is such that the switching unit is turned on when a pressure of said pressure vessel becomes a first value and is turned off when the pressure of said pressure vessel becomes a second value greater than the first value, when said pressure change rate is smaller than a predetermined value, and wherein said second mode is such that said switching unit is turned on when the pressure of said pressure vessel becomes a third value between the first value and the second value and is turned off when the pressure of the pressure vessel becomes the second value, when said pressure rate is greater or equal to said predetermined value.