Method for detecting an operation malfunction of a leakage inspector, and a leakage inspector having a function to detect an operation malfunction thereof
A method for detecting an operation malfunction of a leakage inspector causes the leakage inspector to execute a calibration process and an inspection process. The calibration process seals air inside a first device serving as a reference device and measures changes in pressure over two time interva
A method for detecting an operation malfunction of a leakage inspector causes the leakage inspector to execute a calibration process and an inspection process. The calibration process seals air inside a first device serving as a reference device and measures changes in pressure over two time intervals. The inspection process seals air inside a second device to be checked for a leak and measures changes in pressure over two time intervals. A ratio is calculated from these measured changes in pressure and the ratio is used to determine whether an operation malfunction occurs in the leakage inspector.
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What is claimed is: 1. A method for detecting an operation malfunction of a leakage inspector that checks whether a device has a leak, wherein the method comprises: a calibration process comprising: applying pressure to an inside of a first device serving as a reference device; sealing air inside t
What is claimed is: 1. A method for detecting an operation malfunction of a leakage inspector that checks whether a device has a leak, wherein the method comprises: a calibration process comprising: applying pressure to an inside of a first device serving as a reference device; sealing air inside the first device; measuring a pressure change B1 inside the first device, caused between an end point of sealing the air inside the first device and a first point that is elapsed a predetermined period of time from the end point, and of storing the pressure change B1 in a storage section; and measuring a pressure change B2 inside the first device, caused between the first point and a second point that is further elapsed the predetermined period of time from the first point, and of storing the pressure change B2 in the storage section; and an inspection process comprising: applying pressure to an inside of a second device to be checked for a leak; sealing air inside the second device; measuring a pressure change B1′ inside the second device, caused between an end point of sealing the air inside the second device and a third point that is elapsed the predetermined period of time from the end point, and of storing the pressure change B1′ in the storage section; measuring a pressure change B2′ inside the second device, caused between the third point and a fourth point that is further elapsed the predetermined period of time from the third point, and of storing the pressure change B2′ in the storage section; calculating a value K as (B1′−B2′)/(B1−B2); and signaling in response to the value K whether the operation malfunction is detected. 2. A method for detecting in an operation malfunction of a leakage inspector that checks whether a device has a leak, wherein the method comprises: a calibration process comprising: applying pressure to an inside of a first device serving as a reference device; sealing air inside the first device; calculating a differential value BB1 of pressure inside the first device with respect to time, at a first point that is elapsed a first predetermined period of time from an end point of sealing the air inside the first device, and of storing the differential value BB1 in a storage section; and calculating a differential value BB2 of the pressure inside the first device with respect to time, at a second point that is elapsed a second predetermined period of time from the first point, and of storing the differential value BB2 in the storage section; and an inspection process comprising: applying pressure to an inside of a second device to be checked for a leak; sealing air inside the second device; calculating a differential value BB1′ of pressure inside the second device with respect to time, at a third point that is elapsed the first predetermined period of time from an end point of sealing the air inside the second device, and of storing the differential value BB1′in the storage section; and calculating a differential value BB2′ of the pressure inside the second device with respect to time, at a fourth point that is further elapsed the second predetermined period of time from the third point, and of storing the differential value BB2′ in the storage section; calculating a value K as (BB1′−BB2′)/(BB1−BB2); and signaling in response to the value K whether the operation malfunction is detected. 3. A leakage inspector for checking whether a device has a leak, the leakage inspector comprising: a pneumatic source connected to the device through an air supply line, the pneumatic source adapted to apply pressure to an inside of the device; a valve disposed in the air supply line; a measurement unit adapted to measure the pressure inside the device; a processor; and a storage section adapted to store a measured value obtained by the measurement unit; wherein the processor is adapted to control execution of: opening the valve and applying pressure to an inside of a first device serving as a reference device; closing the valve and sealing air inside the first device; making the measurement unit measure a pressure change B1 inside the first device occurring between an end point of sealing the air inside the first device and a first point that is elapsed a predetermined period of time from the end point, and store the pressure change B1 in the storage section; and making the measurement unit measure a pressure change B2 inside the first device occurring between the first point and a second point that is further elapsed the predetermined period of time from the first point, and store the pressure change B2 in the storage section; opening the valve and applying pressure to an inside of a second device to be checked for a leak; closing the valve and sealing air inside the second device; making the measurement unit measure a pressure change B1′ inside the second device occurring between an end point of sealing the air inside the second device and a third point that is elapsed the predetermined period of time from the end point, and store the pressure change BP in the storage section; and making the measurement unit measure a pressure change B2′ inside the second device occurring between the third point and a fourth point that is further elapsed the predetermined period of time from the third point, and store the pressure change B2′ in the storage section; calculating a value K as (B1′−B2′)/(B1−B2); and signaling in response to the value K whether an operation malfunction in the leakage inspector is detected. 4. A leakage inspector according to claim 3, wherein the measurement unit is a differential pressure gauge; and the pressure changes B1, B2, B1′, and B2′ are changes in pressure difference between the inside of the first device or the second device and an inside of a reference tank. 5. A leakage inspector according to claim 3, wherein the measurement unit is a pressure gauge; and the pressure changes B1, B2, B1′, and B2′ are changes in pressure inside the first device or the second device, with respect to atmospheric pressure. 6. A leakage inspector according to claim 3, wherein the second device is a cast; and the processor is adapted to decide that the second device has a blowhole on its inner wall when the waveform ratio K equals 1 plus a predetermined value or more. 7. A leakage inspector according to claim 3, wherein the processor is adapted to decide whether or not the second device has a leak according to the changes in air pressure inside the second device, and to decide that one of the air supply line, the valve, and the measurement unit has a malfunction when it is decided that the waveform ratio K equals zero plus a predetermined value or less. 8. A leakage inspector for checking whether a device has a leak, the leakage inspector comprising: a pneumatic source connected to the device through an air supply line, the pneumatic source adapted to apply pressure to an inside of the device; a valve disposed in the air supply line; a measurement unit adapted to measure the pressure inside the device; a processor; and a storage section adapted to store a measured value obtained by the measurement unit; wherein the processor is adapted to control execution of: opening the valve and applying pressure to an inside of a first device serving as a reference device; closing the valve and sealing air inside the first device; calculating a differential value BB1 of pressure inside the first device with respect to time, at a first point that is elapsed a first predetermined period of time from an end point of sealing the air inside the first device, and storing the differential value BB1 in the storage section; calculating a differential value BB2 of the pressure inside the first device with respect to time, at a second point that is elapsed a second predetermined period of time from the first point, and storing the differential value BB2 in the storage section; opening the valve and applying pressure to an inside of a second device to be checked for a leak; closing the valve and sealing air inside the second device; calculating a differential value BB1′ of pressure inside the second device with respect to time, at a third point that is elapsed the first predetermined period of time from an end point of sealing the air inside the second device, and storing the differential value BB1′ in the storage section; and calculating a differential value BB2′ of the pressure inside the second device with respect to time, at a fourth point that is further elapsed the second predetermined period of time from the third point, and storing the differential value BB2′ in the storage section; calculating a value K as (BB1′−BB2′)/(BB1−BB2); and signaling in response to the value K whether an operation malfunction of the leakage inspector is detected. 9. A leakage inspector according to claim 8, wherein the measurement unit is a differential pressure gauge; and the differential values BB1, BB2, BB1′, and BB2′ are differential values of pressure differences between the inside of the first device or the second device and an inside of a reference tank. 10. A leakage inspector according to claim 8, wherein the measurement unit is a pressure gauge; and the differential values BB1, BB2, BB1′, and BB2′ are differential values of pressure inside the first device or the second device, with respect to atmospheric pressure. 11. A leakage inspector according to claim 8, wherein the second device is a cast; and the processor is adapted to decide that the second device has a blowhole on its inner wall when the waveform ratio K equals 1 plus a predetermined value or more. 12. A leakage inspector according to claim 8, wherein the processor is adapted to decide whether or not the second device has a leak according to the changes in air pressure inside the second device, and to decide that one of the air supply line, the valve, and the measurement unit has a malfunction when it is decided that the waveform ratio K equals zero plus a predetermined value or less. 13. A method for detecting an operation malfunction of a leakage inspector that checks whether a device has a leak, wherein the method comprises: a calibration process comprising: applying pressure to an inside of a first device serving as a reference device; sealing air inside the first device; and measuring a pressure change B1 inside the first device, caused between an end point of sealing the air inside the first device and a point that is elapsed a predetermined period of time from the end point, and of storing the pressure change B1 in a storage section; and an inspection process comprising: applying pressure to an inside of a second device to be checked for a leak; sealing air inside the second device; measuring a pressure change B1′ inside the second device, caused between an end point of sealing the air inside the second device and a point that is further elapsed the predetermined period of time from the end point, and of storing the pressure change B1′ in the storage section; and signaling that the operation malfunction is detected when the pressure changes B1 and B1′ have a relationship γ·B1+δ>B1′, where γ and δ are constants. 14. A leakage inspector for checking whether a device has a leak, the leakage inspector comprising: a pneumatic source connected to the device through an air supply line, the pneumatic source adapted to apply pressure to an inside of the device; a valve disposed in the air supply line; a measurement unit adapted to measure the pressure inside the device; a processor; and a storage section adapted to store a measured value obtained by the measurement unit; wherein the processor is adapted to control execution of: opening the valve and applying pressure to an inside of a first device serving as a reference device; closing the valve and sealing air inside the first device; making the measurement unit measure a pressure change B1 inside the first device, caused between an end point of sealing the air inside the first device and a point that is elapsed a predetermined period of time from the end point, and store the pressure change B1 in the storage section; opening the valve and applying pressure to an inside of a second device to be checked for a leak; closing the valve and sealing air inside the second device; and making the measurement unit measure a pressure change B1′ inside the second device, caused between an end point of sealing the air inside the second device and a point that is elapsed the predetermined period of time from the end point, and store the pressure change B1′ in the storage section; and signaling that an operation malfunction of the leakage inspector is detected when the pressure changes B1 and B1′ have a relationship γ·B1+δ>B1′, where γ and δ are constants. 15. A leakage inspector according to claim 14, wherein the measurement unit is a differential pressure gauge; and the pressure changes B1 and B1′ are changes in pressure difference between the inside of the first device or the second device and an inside of a reference tank. 16. A leakage inspector according to claim 14, wherein the measurement unit is a pressure gauge; and the pressure changes B1 and B1′ are changes in pressure inside the first device or the second device, with respect to atmospheric pressure.
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이 특허에 인용된 특허 (5)
Furuse Akio,JPX ; Horikawa Hiroshi,JPX ; Nakagomi Masayuki,JPX, Leak test method and apparatus.
Kahn Alan R. (Madison WI) Clark Kenneth R. (Cottage Grove WI) Bahr Dennis E. (Middleton WI), Pressure monitoring and leak detection method and apparatus.
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