CN102539085A - Leak detector with standard substance - Google Patents
Leak detector with standard substance Download PDFInfo
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- CN102539085A CN102539085A CN2010105776044A CN201010577604A CN102539085A CN 102539085 A CN102539085 A CN 102539085A CN 2010105776044 A CN2010105776044 A CN 2010105776044A CN 201010577604 A CN201010577604 A CN 201010577604A CN 102539085 A CN102539085 A CN 102539085A
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- standard substance
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Abstract
The invention discloses a leak detector with a standard substance, which can be used for realizing rapid online leakage detection on an automobile fuel system and a pneumatic braking system of a heavy-duty truck. A 'standard tank' is designed according to a 'similar principle'. The standard tank and a measured object have the same volume to specific surface area ratio, so that the standard tank and the measured object undergo the same aerating, heating and cooling processes when put in the same environment condition. The pressure changes caused by the physical processes of heating and cooling and the environmental temperature change can be counteracted mutually, a pressure difference signal between the standard tank and a measured container is measured simultaneously by using a differential pressure transmitter, and quick online detection can be realized for a large-sized measured system.
Description
Affiliated technical field:
The present invention relates to a kind of differential pressure type leak-checking apparatus, can realize the Pneumatic braking system of vehicle fuel system and truck is realized quick online leak detection with primary standard substance.，
Background technology:
Along with the increase of auto output, to the Leak Detection of the brake system of the fuel system that comprises fuel tank and the truck more than 100 liters, conventional malleation inflation mode almost is helpless under present speed of production.Because in actual use, the pressure that is caused by small leakage changes and all is submerged in the pressure that is caused by temperature variation and changes and suffered, can't be implemented in 90 seconds at all to the braking of automobile and fuel oil etc. greatly volume system carry out online leak detection.
Summary of the invention:
The present invention is directed to the problem that conventional Leak Detection mode exists, adopted " differential pressure " mode of band " according to the concrete condition of system under test (SUT), according to the definite primary standard substance of " similarity " principle ".Because of system under test (SUT) and primary standard substance are to place under the identical environmental baseline, be equivalent to isothermal process.The variation of the pressure that variation of ambient temperature causes has all been cancelled out each other.Differential pressure value between primary standard substance and the system under test (SUT) has also just directly reflected the leak case of system.
Technical scheme:
(brake system is an example) with the pressurized air that modulates through the reference pot in auto brake system the is unified equipment inflation simultaneously of brake piping interface.After after a while, the reference pot in brake system and the equipment reaches pressure equilibrium, measures the differential pressure signal of device between reference pot and brake system, whether has leakage thereby judge brake system of car.
The present invention has adopted the relative detection method according to " reference pot " of " principle of similitude " design.Because of system under test (SUT) and reference pot are to place under the identical environmental baseline, experience identical inflation, intensification, temperature-fall period.So the physical process of heating-cooling and the variation of the pressure that variation of ambient temperature causes all will be cancelled out each other, and utilize differential pressure transmitter to measure the differential pressure signal between reference pot and the tested container simultaneously, the method can realize quick online detection.
Beneficial effect:
The present invention relates to the big volume leak-checking apparatus of a kind of differential pressure type, can realize the quick online leak detection of Pneumatic braking system more than 100 liters of right truck with primary standard substance.Dependable performance, precision is high, does not especially receive the influence of environment temperature.
Description of drawings:
Below in conjunction with accompanying drawing and embodiment the present invention is further specified.
Fig. 1 is a schematic diagram of the present invention.
Embodiment:
Pressurized air is removed through two parts after the moisture content, through once reducing pressure to about 0.1MPa.Through y1, y5 valve the vehicle fuel system is carried out fast aeration again; Wait to be inflated to 80% of authorised pressure～90% o'clock; Close the y1 valve, make pressurized air pass through the secondary decompression, open the y2 valve to reference pot and automotive oil tank (fuel system) defuelling for 0.03-0.04MPa.Close the y2 valve when waiting to be charged to authorised pressure, and open y3, the y4 valve tends to balance by the differential pressure transmitter pressure at two ends gradually, to eliminate because temperature and pressure changes the differential pressure fluctuation of being brought.Valve-off y5 when treating that pressure is in a basic balance still opens differential pressure transmitter two ends valve y3, y4 opens, and what the differential pressure transmitter two ends were reacted like this has been exactly the differential pressure value between reference pot and the vehicle fuel system.If fuel system has leakage, then the high differential pressure transmitter of sensitivity just can reflect the form of leaking with differential pressure, and the data processing of process computing machine and analysis, judgement just can confirm whether system is qualified.
Claims (1)
1. leak-checking apparatus with primary standard substance; It is characterized in that: installed one for making the pressure that causes owing to temperature variation between reference pot and the system under test (SUT) change and to cancel out each other fully; Concrete condition according to system under test (SUT); According to the reference pot of " similarity " principle design, reference pot has identical volume and surface area ratio with measured object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105776044A CN102539085A (en) | 2010-12-07 | 2010-12-07 | Leak detector with standard substance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105776044A CN102539085A (en) | 2010-12-07 | 2010-12-07 | Leak detector with standard substance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102539085A true CN102539085A (en) | 2012-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105776044A Pending CN102539085A (en) | 2010-12-07 | 2010-12-07 | Leak detector with standard substance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102539085A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575478A (en) * | 2012-07-23 | 2014-02-12 | 诸城福田汽车科技开发有限公司 | Method and device for detecting brake air tightness |
| CN108700485A (en) * | 2015-12-14 | 2018-10-23 | 日本福田株式会社 | Leak inspection device and method |
-
2010
- 2010-12-07 CN CN2010105776044A patent/CN102539085A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575478A (en) * | 2012-07-23 | 2014-02-12 | 诸城福田汽车科技开发有限公司 | Method and device for detecting brake air tightness |
| CN108700485A (en) * | 2015-12-14 | 2018-10-23 | 日本福田株式会社 | Leak inspection device and method |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Chen Li Document name: Notification that Application Deemed to be Withdrawn |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120704 |