Leak tester and leak testing method
First Claim
1. A leak tester for testing the tightness and outward leakage of a test object provided with first and second openings and having an internal volume between said first and second openings, where no fluid is allowed to flow from said first opening to said second opening for the case of the non-leaking test object, comprising:
- a master having substantially the same internal volume as said test object;
a pressure source for supplying a fluid of a predetermined pressure to said test object and said master, said pressure source supplying said fluid to said test object through said first opening;
a first measuring instrument for measuring a pressure difference between a pressure of said fluid within said test object and that within said master; and
a second measuring instrument for measuring a flow rate of said fluid flowing out of said test object only through said second opening to detect an internal leakage inside the test object,wherein said leak tester detects outward leakage of said fluid from said test object other than that internal leakage through said second opening on a basis of said measured pressure difference and said measured flow rate.
2 Assignments
0 Petitions
Accused Products
Abstract
This invention relates to a leak tester for testing the tightness of a test object such as a fuel feed apparatus for an internal combustion engine, and specifically to a leak tester for testing the air tightness of a fuel feed apparatus provided with a first opening and a second opening and having a space portion between the first and second openings. The leak tester is provided with a master (reference chamber) having substantially the same internal volume as the fuel feed apparatus, a pneumatic pressure source for supplying air of a predetermined pressure to the test object through the first opening and also to the master, a differential pressure leak tester for measuring a pressure difference between a pressure of the fluid within the test object and that within the master, and a flow meter for measuring a flow rate of air flowing out of the fuel feed apparatus through the second opening; and the leak tester detects leakage of air from the test object other than that through the second opening on a basis of the pressure difference and the flow rate.
50 Citations
16 Claims
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1. A leak tester for testing the tightness and outward leakage of a test object provided with first and second openings and having an internal volume between said first and second openings, where no fluid is allowed to flow from said first opening to said second opening for the case of the non-leaking test object, comprising:
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a master having substantially the same internal volume as said test object; a pressure source for supplying a fluid of a predetermined pressure to said test object and said master, said pressure source supplying said fluid to said test object through said first opening; a first measuring instrument for measuring a pressure difference between a pressure of said fluid within said test object and that within said master; and a second measuring instrument for measuring a flow rate of said fluid flowing out of said test object only through said second opening to detect an internal leakage inside the test object, wherein said leak tester detects outward leakage of said fluid from said test object other than that internal leakage through said second opening on a basis of said measured pressure difference and said measured flow rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A leak testing method for testing the tightness and outward leakage of a test object provided with a first opening and a second opening and having an internal volume between said first and second openings, where no fluid is allowed to flow from said first opening to said second opening for the case of the non-leaking test object, comprising:
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feeding a fluid of a predetermined pressure to said test object through said first opening; feeding said fluid of said predetermined pressure to a master, said master having substantially the same internal volume as said test object; measuring a pressure difference between a pressure of said fluid within said test object and that within said master; and measuring a flow rate of said fluid flowing out of said test object only through said second opening to detect an internal leakage inside the test object, wherein said method detects an outward leakage of said fluid from said test object other than that internal leakage through said second opening on a basis of said measured pressure difference and said measured flow rate. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A leak tester for detecting outward leakage other than an internal leakage of a test object having a first opening, a second opening, and a first internal volume provided between the first and second openings, the first internal volume having at least one restrictor therein which restricts a fluid flow from the first opening to the second opening, where no fluid is allowed to flow from said first opening to said second opening for the case of the non-leaking test object, comprising:
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a master having a second internal volume; a pressure source which provides pressurized fluid to the test object through the first opening and to said master; a first measuring unit which measures a difference between a pressure inside the test object at an upstream side of the restrictor and a pressure inside said master; and a second measuring unit which measures an amount of said fluid leaking through the restrictor, wherein the leak tester detects the outward leakage through the restrictor based on said measured pressure difference and said measured fluid amount. - View Dependent Claims (16)
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Specification