CN103364141A - Handheld gas leakage detector - Google Patents
Handheld gas leakage detector Download PDFInfo
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- CN103364141A CN103364141A CN 201310222715 CN201310222715A CN103364141A CN 103364141 A CN103364141 A CN 103364141A CN 201310222715 CN201310222715 CN 201310222715 CN 201310222715 A CN201310222715 A CN 201310222715A CN 103364141 A CN103364141 A CN 103364141A
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Abstract
A handheld gas leakage detector comprises a shell connected with a sound wave receiving pipeline; the shell is internally provided with an ultrasonic wave receiver, an impedance matching module, a front stage amplifier, a bandpass filter and a tail stage amplifier, which are connected in sequence; the tail stage amplifier is connected with a controller module connected with a display module; and the controller module is provided with a signal processing module and an upper computer communication module. The handheld gas leakage detector disclosed by the invention overcomes the defects of the existing detection method, can fast and accurately judge whether gas is leaked or not, and can detect the gas leakage position and estimate leakage amount.
Description
Technical field
The present invention relates to a kind of gas-detecting device, particularly a kind of hand held gas leak detector.
Background technology
At present, no matter all use in a large number the mode that gas compression transports in the industry or in the life.As: gas tank, natural gas pipe etc.Meanwhile, for various reasons, Leakage Gas occurs often.Leakage Gas not only can contaminated air and the waste resource, and is flammable explosive gas, also can bring casualties and property loss.Therefore, needing quick and precisely, the locating gas location of leak keeps in repair.The gas leakdetector leak hunting method is divided into two classes substantially.One class is take the patent No. as ZL200910089296.8, and denomination of invention is the technical scheme of the patent record of " combustible gas leakage alarm ", utilizes gas sensor contact gas leakage, converts for information about concentration to electric signal, arrives testing goal.The method needs Leakage Gas to form finite concentration in the space, fast the locating gas leakage point.Another kind of is take the patent No. as ZL200810135671.3, and denomination of invention is the technical scheme of the patent record of " gas gas leak detection apparatus and method thereof ", is by detection detection of gas flow rate Leakage Gas situation, but can not locates fast leakage point.
Summary of the invention
The problem and shortage that the present invention be directed to prior art provides a kind of hand held gas leak detector, has overcome the shortcoming of above-mentioned detection method, can judge quick and precisely whether gas leaks; And detect the Leakage Gas place and estimate leakage rate.
The technical scheme that the present invention takes is: hand held gas leak detector, comprise housing, and housing connects the sound wave receiving pipeline; Establish in the described housing: ultrasonic receiver, impedance matching module, pre-amplifier, bandpass filter, output amplifier, described ultrasonic receiver, impedance matching module, pre-amplifier, bandpass filter, output amplifier connect successively, and output amplifier connects controller module; Described controller module connects display module; Described controller module is provided with signal processing module, Upper machine communication module.
Be provided with power management module in the described housing, described power management module comprises charging device, rechargeable battery and DC converter.
Described display module is touch-screen.
Described controller module is the STM32 single-chip microcomputer.
Described housing is almag sealed explosion-proof shell.
Described sound wave receiving pipeline is provided with movable pipeline arm, and the probe of ultrasonic receiver is positioned at the top of movable pipeline arm.
Described bandpass filter is the 40KHZ bandpass filter.
Hand held gas leak detector of the present invention, beneficial effect is as follows:
1), hand-held, flexible operation, convenience;
2), can be rapid at the scene, accurately, find out intuitively the gas of all kinds of pressure and vacuum total system, the leak of liquid fault;
3), because the characteristic phenomenon of Leakage Gas is identical, can also detect boats and ships, automobile cabin, refrigerator, the seal degree of the airtight device such as container.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples:
Fig. 1 is external structure schematic diagram of the present invention.
Fig. 2 is inner structure block diagram of the present invention.
Fig. 3 is test flow chart of the present invention.
Fig. 4 is the relation of sound pressure level of the present invention and Reynolds number.
Embodiment
As shown in Figure 1 and Figure 2, hand held gas leak detector comprises housing 1, and described housing 1 is almag sealed explosion-proof shell.Housing 1 connects sound wave receiving pipeline 2.Establish in the described housing 1: ultrasonic receiver 3, impedance matching module 4, pre-amplifier 5, bandpass filter 6, output amplifier 7, described ultrasonic receiver 3, impedance matching module 4, pre-amplifier 5, bandpass filter 6, output amplifier 7 connect successively, output amplifier 7 connects controller module 8, and output amplifier 7 is sent output signal into controller module 8.
Described controller module 8 is the STM32 single-chip microcomputer.Inner 12 bit AD samples of the STM32 single-chip microcomputer that adopts are crossed FIR, FFT with the data communication device of sampling again and sound intensity estimating algorithm has judged whether Leakage Gas.
Described sound wave receiving pipeline 2 adopts engineering plastic PC, and described sound wave receiving pipeline 2 is provided with movable pipeline arm, and movable pipeline arm adopts the metal swan neck, can be crooked flexibly, be convenient to locate the dead angle leakage point.The probe of ultrasonic receiver 3 is positioned at the top of movable pipeline arm.
Described controller module 8 connects display module 9; Described display module 9 is touch-screen, is used for showing the single-chip microcomputer testing result, input instruction query history record etc.
Described controller module 8 is provided with signal processing module, Upper machine communication module.Employing is used for instrument and communicates by letter with the PC end based on the serial ports of RS232.
Described controller module 8 also connects memory storage, adopts EEPROM model 24C256 storer, is used for storage and detects data;
Described controller module 8 also connects the column pilot lamp 11 that a plurality of LED form, and adopts the light emitting diode array, the auxiliary Leakage Gas intensity (or leakage point is far away and near) that shows.
Be provided with power management module 10 in the described housing 1, described power management module 10 comprises charging device, rechargeable battery and DC converter.Charging device is used for to the rechargeable battery charging, gives whole detector means power supply by the DC converter again.
Principle of work:
If gassy in container or in the pipeline, when its internal pressure during greater than external pressure, because inside and outside differential pressure is larger, in case container has small opening, gas will be gone out from small opening.When orifice sizes less, and when Reynolds number is higher, go out gas and will form turbulent flow, turbulent flow can produce the ultrasound wave of certain frequency near small opening, the frequency of acoustic vibration is relevant with orifice sizes: when small opening is larger, people's ear can be heard gas leakage sound, and when very little and frequency of sound wave was very high when small opening, people's ear just can't hear.But they can be propagated in air, are known as unloaded ultrasound wave.Ultrasound wave is the high-frequency short waves signals, and its intensity is rapidly decay along with the increase of propagation distance.Ultrasound wave has directive property.Utilize this feature, can judge correct leak position.
Sound pressure level L is determined by leak p in the pressure and leak diameter D, concerns as follows:
Wherein: Po is the ambient atmosphere absolute pressure; P is that leak is stayed pressure.
By following formula as can be known, when with leak distance one regularly, sound pressure level is that the variation with leak diameter and system pressure changes.Following relation is arranged between 40kHz point acoustic pressure and Reynolds number:
ρ is gas density; μ is viscosity; υ is flow velocity; D is the mechanics mean diameter.
This shows, when detecting near the leak at the sound intensity of Frequency point, then can extrapolate the Reynolds number of this leak.When Reynolds number and gas flow rate are known, can obtain this leak mean diameter D, therefore can draw leakage rate.
Certain relation that should satisfy between ultrasonic receiver 3 output impedance of the present invention and the loaded impedance that connects, the duty on the equipment ultrasonic receiver produces significantly impact after the load in order to avoid connect.Loaded impedance equals the ultrasonic receiver internal impedance, and namely their mould and argument equate respectively, can obtain undistorted voltage transmission on loaded impedance.When loaded impedance equals the conjugate of information source internal impedance, can obtain peak power on the loaded impedance.Therefore input again the prime amplifying element after the ultrasonic receiver output signal process impedance matching link.
Ultrasonic probe of the present invention passes to the signal conditioning circuit part with the signal that receives.Signal condition partly comprises the once amplification of impedance matching circuit and signal, and the bandpass filter of 40KHz and the secondary of signal amplify.Circuit after signal conditioning circuit will be processed passes to controller module 8.Controller module 8 is to adopt general STM32 single-chip microcomputer.Single-chip microcomputer is done data analysis, and the data after processing are delivered to column pilot lamp 11 and the touch-screen that a plurality of LED form.Touch-screen is connected by serial ports with single-chip microcomputer.
Claims (6)
1. hand held gas leak detector comprises housing (1), it is characterized in that, housing (1) connects sound wave receiving pipeline (2);
Described housing is established in (1): ultrasonic receiver (3), impedance matching module (4), pre-amplifier (5), bandpass filter (6), output amplifier (7), described ultrasonic receiver (3), impedance matching module (4), pre-amplifier (5), bandpass filter (6), output amplifier (7) connect successively, and output amplifier (7) connects controller module (8);
Described controller module (8) connects display module (9);
Described controller module (8) is provided with signal processing module, Upper machine communication module.
2. described hand held gas leak detector according to claim 1 is characterized in that, be provided with power management module (10) in the described housing (1), described power management module (10) comprises charging device, rechargeable battery and DC converter.
3. described hand held gas leak detector according to claim 1 is characterized in that, described display module (9) is touch-screen.
4. described hand held gas leak detector according to claim 1 is characterized in that, described controller module (8) is the STM32 single-chip microcomputer.
5. described hand held gas leak detector according to claim 1 is characterized in that, described housing (1) is almag sealed explosion-proof shell.
6. described hand held gas leak detector according to claim 1 is characterized in that, described sound wave receiving pipeline (2) is provided with movable pipeline arm, and the probe of ultrasonic receiver (3) is positioned at the top of movable pipeline arm.
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
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CN105044615A (en) * | 2015-08-09 | 2015-11-11 | 安徽普为智能科技有限责任公司 | Lithium battery safety detection method |
CN105158693A (en) * | 2015-08-09 | 2015-12-16 | 安徽普为智能科技有限责任公司 | Lithium battery electric-leakage detection method |
CN105157935A (en) * | 2015-08-09 | 2015-12-16 | 安徽普为智能科技有限责任公司 | Method for detecting airtight uniformity of lithium battery |
CN106033020A (en) * | 2015-03-13 | 2016-10-19 | 中国航空工业集团公司西安飞机设计研究所 | Device and method for detecting air tightness of airplane structure under non-supercharged state |
CN106153265A (en) * | 2016-06-20 | 2016-11-23 | 清华大学 | A kind of hand held gas leak device for fast detecting |
CN106840540A (en) * | 2017-03-27 | 2017-06-13 | 大连海安船舶与海洋工程技术服务公司 | Combination ultrasonic ship watertight compartment hatch leak detector and its operating method |
CN108253304A (en) * | 2018-01-16 | 2018-07-06 | 孙加亮 | A kind of novel gas pipeline leakage detection device |
CN109318585A (en) * | 2018-11-06 | 2019-02-12 | 常德金鹏印务有限公司 | A kind of Handheld oil black viscosity controller |
CN113607347A (en) * | 2021-07-23 | 2021-11-05 | 山东非金属材料研究所 | Method and device for detecting leakage of vacuum hot-press molding composite armor material |
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2013
- 2013-06-05 CN CN 201310222715 patent/CN103364141A/en active Pending
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106033020A (en) * | 2015-03-13 | 2016-10-19 | 中国航空工业集团公司西安飞机设计研究所 | Device and method for detecting air tightness of airplane structure under non-supercharged state |
CN105044615A (en) * | 2015-08-09 | 2015-11-11 | 安徽普为智能科技有限责任公司 | Lithium battery safety detection method |
CN105158693A (en) * | 2015-08-09 | 2015-12-16 | 安徽普为智能科技有限责任公司 | Lithium battery electric-leakage detection method |
CN105157935A (en) * | 2015-08-09 | 2015-12-16 | 安徽普为智能科技有限责任公司 | Method for detecting airtight uniformity of lithium battery |
CN106153265A (en) * | 2016-06-20 | 2016-11-23 | 清华大学 | A kind of hand held gas leak device for fast detecting |
CN106840540A (en) * | 2017-03-27 | 2017-06-13 | 大连海安船舶与海洋工程技术服务公司 | Combination ultrasonic ship watertight compartment hatch leak detector and its operating method |
CN106840540B (en) * | 2017-03-27 | 2023-09-19 | 大连海安船舶与海洋工程技术服务公司 | Combined ultrasonic watertight compartment hatch leak detector for ship and operation method thereof |
CN108253304A (en) * | 2018-01-16 | 2018-07-06 | 孙加亮 | A kind of novel gas pipeline leakage detection device |
CN109318585A (en) * | 2018-11-06 | 2019-02-12 | 常德金鹏印务有限公司 | A kind of Handheld oil black viscosity controller |
CN109318585B (en) * | 2018-11-06 | 2021-01-29 | 常德金鹏印务有限公司 | Handheld ink viscosity controller |
CN113607347A (en) * | 2021-07-23 | 2021-11-05 | 山东非金属材料研究所 | Method and device for detecting leakage of vacuum hot-press molding composite armor material |
CN113607347B (en) * | 2021-07-23 | 2024-04-23 | 山东非金属材料研究所 | Vacuum hot-press molding composite armor material leakage detection method and device |
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