초록 ▼

The present invention provides a leakage measuring device capable of measuring the leakage always accurately. In a leakage measuring device constructed such that a cylinder has an inside thereof divided into one pressure chamber and the other pressure chamber by a piston rod mounted in the cylinder,

The present invention provides a leakage measuring device capable of measuring the leakage always accurately. In a leakage measuring device constructed such that a cylinder has an inside thereof divided into one pressure chamber and the other pressure chamber by a piston rod mounted in the cylinder, one pressure chamber is connected with a pressurizer and the other pressure chamber is connected with a circuit or the like which constitutes a measuring object, and based on the movement of the piston when one pressure chamber is pressurized, a leakage of the circuit or the like which constitutes the measuring object is measured, the improvement being characterized in that pressure receiving areas of the piston in both pressure chambers are made equal to each other, and a detection rod which is fixedly secured to the cylinder side is inserted into a detection hole formed along an axis of the piston while holding the detection rod in a non-contact condition, and the detection rod and the detection hole constitute a non-contact stroke sensor.

대표청구항 ▼

[ What is claimed is:] [1.]1. A leakage measuring device constructed such that a cylinder has an inside thereof divided into one pressure chamber and an other pressure chamber by a piston rod mounted in said cylinder, said one pressure chamber is connected with a pressurizer and said other pressure

[ What is claimed is:] [1.]1. A leakage measuring device constructed such that a cylinder has an inside thereof divided into one pressure chamber and an other pressure chamber by a piston rod mounted in said cylinder, said one pressure chamber is connected with a pressurizer and said other pressure chamber is connected with a circuit which constitutes a measuring object, and based on the movement of said piston when said one pressure chamber is pressurized, a leakage of said circuit which constitutes said measuring object is measured,the improvement being characterized in that pressure receiving areas of said piston in said one pressure chamber and said other pressure chamber are made equal to each other, and a detection rod which is fixedly secured to said cylinder side is inserted into a detection hole formed along an axis of said piston while holding said detection rod in a non-contact condition, said detection rod and said detection hole constitute a non-contact stroke sensor; andwherein a lap portion is formed in the vicinity of the center of the inside of said cylinder and said piston is slidably inserted into a hole formed in said lap portion.