Leak testing method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTetsuya YAMAGUCHI
Life of this patent
Estimating the term…
Abstract
Provided is a leak testing method of a workpiece including spaces which are three partitioned void portions, the leak testing method being capable of separately learning an amount of leakage from each of the spaces, and precisely determining whether the workpiece is normal or defective. The leak testing method includes steps of obtaining total leakage amounts, and a step of calculating, based on the obtained total leakage amounts, a first leakage amount, a second leakage amount, a third leakage amount, a fourth leakage amount, a fifth leakage amount and a sixth leakage amount which are amounts of leakage from respective routes when gas is injected to a workpiece at a predetermined pressure.
Claims2
A leak testing method for performing a leak test of a workpiece including a first space, a second space and a third space which are three partitioned void portions, and being likely to include a first external connection route which connects the first space to the outside, a second external connection route which connects the second space to the outside, a third external connection route which connects the third space to the outside, a first internal connection route which connects the first space and the second space, a second internal connection route which connects the second space and the third space, and a third internal connection route which connects the third space and the first space, the leak testing method comprising:
- a first step of injecting a gas to the first space at a predetermined pressure, and obtaining a first total leakage amount which is a total amount of the gas leaking from the first internal connection route, the third internal connection route and the first external connection route;
- a second step of injecting the gas to the second space at a predetermined pressure, and obtaining a second total leakage amount which is a total amount of the gas leaking from the first internal connection route, the second internal connection route and the second external connection route;
- a third step of injecting the gas to the third space at a predetermined pressure, and obtaining a third total leakage amount which is a total amount of the gas leaking from the second internal connection route, the third internal connection route and the third external connection route;
- a fourth step of injecting the gas to the first space, the second space and the third space at a predetermined pressure, and obtaining a fourth total leakage amount which is a total amount of the gas leaking from the first external connection route, the second external connection route and the third external connection route;
- a fifth step of injecting the gas to the first space and the third space at a predetermined pressure, and obtaining a fifth total leakage amount which is a total amount of the gas leaking from the first external connection route, the third external connection route, the first internal connection route and the second internal connection route;
- a sixth step of injecting the gas to the first space and the second space at a predetermined pressure, and obtaining a sixth total leakage amount which is a total amount of the gas leaking from the first external connection route, the second external connection route, the second internal connection route and the third internal connection route;
- a step of calculating, based on the obtained first to sixth total leakage amounts, first to sixth leakage amounts which are amounts of leakage from the first external connection route, the second external connection route, the third external connection route, the first internal connection route, the second internal connection route and the third internal connection route respectively when the gas is injected to the workpiece at a predetermined pressure;
- and
- a step of determining whether the workpiece is normal or defective based on the calculated first to sixth leakage amounts.
A leak testing method for performing a leak test of a workpiece including a first space, a second space and a third space which are three partitioned void portions, and being likely to include a first external connection route which connects the first space to the outside, a second external connection route which connects the second space to the outside, a third external connection route which connects the third space to the outside, a first internal connection route which connects the first space and the second space, a second internal connection route which connects the second space and the third space, and a third internal connection route which connects the third space and the first space, the leak testing method comprising:
- a first step of injecting a gas to the first space at a predetermined pressure, and obtaining a first total leakage amount which is a total amount of the gas leaking from the first internal connection route, the third internal connection route and the first external connection route;
- a second step of injecting the gas to the second space at a predetermined pressure, and obtaining a second total leakage amount which is a total amount of the gas leaking from the first internal connection route, the second internal connection route and the second external connection route;
- a third step of injecting the gas to the third space at a predetermined pressure, and obtaining a third total leakage amount which is a total amount of the gas leaking from the second internal connection route, the third internal connection route and the third external connection route;
- a first determining step of determining whether the workpiece is normal or defective after the first to third steps are performed, based on the obtained first to third total leakage amounts;
- a fourth step of inserting the gas to the first space, the second space and the third space at a predetermined pressure and obtaining a fourth total leakage amount which is a total amount of the gas leaking from the first external connection route, the second external connection route and the third external connection route;
- a fifth step of injecting the gas to the first space and the third space at a predetermined pressure, and obtaining a fifth total leakage amount which is a total amount of the gas leaking from the first external connection route, the third external connection route, the first internal connection route and the second internal connection route;
- a sixth step of injecting the gas to the first space and the second space at a predetermined pressure, and obtaining a sixth total leakage amount which is a total amount of the gas leaking from the first external connection route, the second external connection route, the second internal connection route and the third internal connection route;
- a calculating step of calculating, based on the obtained first to sixth total leakage amounts, first to sixth leakage amounts which are amounts of leakage from the first external connection route, the second external connection route, the third external connection route, the first internal connection route, the second internal connection route and the third internal connection route respectively when the gas is injected to the workpiece at a predetermined pressure;
- and
- a second determining step of determining whether the workpiece is normal or defective based on the calculated first to sixth leakage amounts, wherein
- in the first determining step, when it is determined that the workpiece is normal, the leak test is finished, and
- in the first determining step, when it is not determined that the workpiece is normal, the fourth to sixth steps, the calculating step and the second determining step are performed.
Dependencies are inferred from the claim text.