CN105987796A - Method and device for detecting gas concentration - Google Patents
Method and device for detecting gas concentration Download PDFInfo
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- CN105987796A CN105987796A CN201510076333.7A CN201510076333A CN105987796A CN 105987796 A CN105987796 A CN 105987796A CN 201510076333 A CN201510076333 A CN 201510076333A CN 105987796 A CN105987796 A CN 105987796A
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Abstract
The invention discloses a method and a device for detecting a gas concentration. The method comprises the following steps: S1, a to-be-detected workpiece is placed in sealed space; S2, a plurality of gas suction points are distributed outside the to-be-detected workpiece, and each gas suction point is numbered to mark the gas suction point position; S3, vacuum pumping is carried out on the sealed space, and the vacuum pressure can be larger than 100 Pa; S4, a tracing gas is filled inside the to-be-detected workpiece; S5, a gas sensor arranged outside the sealed space carries out gas concentration detection on the suction gas via the gas suction points; and S6, when the gas sensor detects the concentration of the tracing gas at a certain gas suction point reaches a preset leakage value, the leakage position of the to-be-detected workpiece is determined according to the number of the gas suction point. By adopting the above technical scheme of the invention, detection on the gas concentration and the gas leakage can be quickly realized at a low cost, automatic detection is also realized, manual intervention is not needed, and the leakage point can be basically positioned.
Description
Technical field
The present invention relates to a kind of gas detection technology, be specifically related to a kind of gas concentration detection method and for realizing
The device of the method.
Background technology
Gas concentration (including gas leak detection) Detection Techniques range of application is relatively wide, wherein the inspection of vacuum box type gas
Leakage technology and big air-aspiration gun formula leak hunting technology are conventional two kind, by the detection of trace gas concentration to product
Carry out air-leakage test.
Vacuum box type and big air-aspiration gun formula gas leak detection technology are usually with gas such as halogen gas, hydrogen or helium
Body is as search gas, as it is shown in figure 1, vacuum box type gas leakage detecting device includes detection case 1, vacuum pumping valve
Door 4, vacuum pump 5, gas sensor valve 6, gas sensor 7, search gas valve 2 and spike gas
Bromhidrosis source 3, during detection, first opens vacuum-pumping valve 4, with vacuum pump 5, detection case 1 is evacuated to high vacuum,
Then open search gas valve 2 and search gas source of the gas 3, search gas be filled with workpiece 10 to be checked internal,
Finally open gas sensor valve 6, detect the outside search gas of workpiece 10 to be checked with gas sensor 7
Concentration, if the search gas signal detected exceedes gas sensor 7 setting value, shows that workpiece to be checked has
Leakage.
The feature of vacuum box type gas leakage detecting technology is that workpiece to be checked is placed in detection case 1, shows filling workpiece
Before track gas leak detection, first open vacuum-pumping valve 4, with vacuum pump 5, detection case is evacuated to high vacuum, to very
The requirement of reciprocal of duty cycle is the highest, and the accuracy not so detected is easily subject to impact.Due to high vacuum, search gas
Diffusion velocity is fast, and gas sensor 7 is made without assisted inhalation and leans on search gas in the diffusion of vacuum environment
Motion can quickly detect the concentration of search gas.Vacuum box type gas leakage detecting system accuracy of detection is high, produces
Beat is fast, it is possible to achieve fully-automated synthesis, is not required to manual intervention.But device structure is sufficiently complex and strict,
Device fabrication cost is high, since it is desired that high vacuum, Vacuum System Design is complicated, and manufacturing cost is the highest, high
The equipment investment of cost limits promoting the use of of vacuum box type leak hunting technology, and the most this technology can not be treated
The leakage point examining workpiece concrete positions.
As in figure 2 it is shown, big air-aspiration gun formula gas leakage hunting apparatus includes search gas valve 2, search gas source of the gas
3, suction gun 12 and gas sensor 7, is characterized in using artificial hand-held suction gun 12 to detect under atmospheric environment
The suspected location of product, is confirmed whether to there is leakage, and can position leakage point, can detect
To concrete leak position.Owing to operating under atmospheric environment, this method requires suction gun 12 and test point
Distance ＜ 3mm, the suction gun time of staying of each test point is 3 seconds, translational speed ＜ 20mm/sec.Big aspiration
Gun-type gas leakage hunting apparatus equipment cost is relatively low, only need to be equipped with gas concentration sensor and suction gun, but this inspection
Survey method relies on the experience of operator, and accuracy of detection is low, it is impossible to ensure work quality, and efficiency is the lowest.
Summary of the invention
Present invention aims to the problems referred to above weak point, it is provided that a kind of new gas concentration detection side
Method, it both can realize low cost and detect gas concentration, gas leakage rapidly, having realized the most simultaneously
Automatically detection and without manual intervention, but also leakage point substantially can be positioned.
In order to achieve the above object, the present invention is by the following technical solutions:
A kind of gas concentration detection method, it comprises the following steps:
S1: workpiece to be checked is placed in confined space；
S2: in confined space, outside at workpiece to be checked is distributed some gases suction point, and to each gas
Body sucks and clicks on a line position number-mark gas suction point position；
S3: confined space is carried out evacuation, and vacuum pressure is between 100Pa-90000Pa；
S4: inside workpiece to be checked is filled with search gas；
S5: be arranged on the gas sensor outside confined space and carry out gas by gas suction point to sucking gas
Bulk concentration detects, and described gas sensor is provided with the detection numbering corresponding with sucking a Position Number；
S6: when gas sensor detects that the trace gas concentration of a certain gas suction point reaches to preset leakage value,
The leak position of workpiece to be checked can be determined according to the Position Number of this gas suction point.
Further, described gas sucks the distance of point and workpiece to be checked between 6mm-200mm；Described gas
Suck point to be arranged on outside the easy leak of workpiece to be checked.
The most concrete, described each gas sucks point and individually connects a gas sensor.Or, described gas
Body sucks point unified connection one gas sensor.
Another object of the present invention is to the device providing the gas concentration of a kind of said method to detect, it is concrete
Technical scheme is as follows:
The device that a kind of gas concentration for said method detects, it includes offer confined space for putting
Put the detection case of workpiece to be checked；Described detection case is outside equipped with the search gas valve being connected with inside workpiece to be checked
Door and search gas source of the gas；Described detection case is externally provided with the evacuation for its confined space carries out evacuation
Valve and vacuum pump；If in the confined space of described detection case and workpiece to be checked is externally provided with dry gas suction nozzle, institute
State gas suction nozzle by pipeline and the gas sensor valve being arranged on outside detection case, gas suction pump and gas
Sensor connects, and described each gas suction nozzle is marked with Position Number, and described gas sensor be provided with
The detection that the Position Number of gas suction nozzle is corresponding is numbered.
Further, the distance of described gas suction nozzle and workpiece to be checked is between 6mm-200mm；Described gas
Suction nozzle is arranged on outside the easy leak of workpiece to be checked.
The most concrete, each gas suction nozzle individually connects one group of gas sensor valve, gas suction pump
And gas sensor；Or described each gas suction nozzle individually connects one group of gas sensor valve and gas
After suction pump, unification is connected with a gas sensor.
As preferably, device of the present invention also includes a Programmable Logic Controller, its respectively with search gas valve
Door, vacuum-pumping valve, vacuum pump, gas suction pump, gas sensor valve and gas sensor electrical connection.
The present invention uses technique scheme, and it both can realize low cost and rapidly to gas concentration, gas
Leakage detects, and realizes automatically detection the most simultaneously and without manual intervention, but also can click on leakage
Row substantially positions.
Accompanying drawing explanation
Fig. 1 is that existing vacuum box type gas leakage detecting device simplifies structural representation.
Fig. 2 is that existing big air-aspiration gun formula gas leakage hunting apparatus simplifies structural representation.
Fig. 3 is that embodiment 2 gas concentration of the present invention detection device simplifies structural representation.
Fig. 4 is the electrical principle simplified block diagram of embodiment 2 gas concentration of the present invention detection device.
Fig. 5 is that embodiment 3 gas concentration of the present invention detection device simplifies structural representation.
Fig. 6 is the electrical principle simplified block diagram of embodiment 3 gas concentration of the present invention detection device.
Below by way of accompanying drawing and concrete application mode, the invention will be further described:
Detailed description of the invention
Embodiment 1
A kind of gas concentration detection method of the present invention, utilizes a kind of gas to spread in another kind of gas
The principle that is inversely proportional to the pressure of ambient gas of speed, i.e. utilize search gas to spread speed under vacuum conditions
Spend faster feature, take vacuum box type gas leakage detecting technology and the advantage of big both air-aspiration gun formula leak hunting technologies
Scientific and reasonable being implemented in combination with, it both can realize low cost and examine gas concentration, gas leakage rapidly
Survey, realize automatically detection the most simultaneously and without manual intervention, but also leakage point substantially can be positioned.
Gas concentration detection method of the present invention comprises the following steps:
S1: workpiece to be checked is placed in confined space；
S2: in confined space, outside at workpiece to be checked is distributed some gases suction point, and to each gas
Body sucks and clicks on a line position number-mark gas suction point position；
S3: confined space is carried out evacuation, and vacuum pressure is between 100Pa-90000Pa；
S4: inside workpiece to be checked is filled with search gas；
S5: be arranged on the gas sensor outside confined space and carry out gas by gas suction point to sucking gas
Bulk concentration detects, and described gas sensor is provided with the detection numbering corresponding with sucking a Position Number；
S6: when gas sensor detects that the trace gas concentration of a certain gas suction point reaches to preset leakage value,
The leak position of workpiece to be checked can be determined according to the Position Number of this gas suction point.
Further, described gas sucks the distance of point and workpiece to be checked between 6mm-200mm；Described gas
Suck point to be arranged on outside the easy leak of workpiece to be checked.
The most concrete, described each gas sucks point and individually connects a gas sensor.Or, described gas
Body sucks point unified connection one gas sensor.
Gas concentration detection method of the present invention, utilizes a kind of gas speed of diffusion in another kind of gas
The principle that degree is inversely proportional to the pressure of ambient gas, i.e. utilizes search gas diffusion velocity in a low voltage state more
Fast feature, is evacuated to certain vacuum (vacuum than existing vacuum box type gas leakage detecting technology to confined space
Degree requires low), then utilize the gas suction point near workpiece to be checked to carry out active inspiration conveying gas sensor
(because utilizing the close suction technology of big air-aspiration gun formula leak hunting technology, the transport of search gas can be accelerated,
Therefore gas leak detection technology box to vacuum level requirements relative vacuum is relatively low, such that it is able to the material of the equipment of saving
And manufacturing cost), if workpiece to be checked has leakage, the gas signal of leakage can be inhaled into and a little be collected by gas
Body sensor leans out, and separately owing to suction clicking on line position number-mark, can more accurately determine leakage point
Position.Bulk concentration detection method of the present invention, takes vacuum box type gas leakage detecting technology and big air-aspiration gun
The advantage of both formula leak hunting technologies is scientific and reasonable to be implemented in combination with, and it both can realize low cost and rapidly to gas
The leakage of concentration, gas detects, realize automatically detection the most simultaneously and without manual intervention, but also permissible
Leakage point is substantially positioned.
Embodiment 2
As shown in Figures 3 and 4, a kind of gas concentration detection device of the present invention, utilize a kind of gas to exist
The principle that in another kind of gas, the speed of diffusion is inversely proportional to the pressure of ambient gas, i.e. utilizes search gas to exist
The faster feature of diffusion velocity under low-pressure state, takes vacuum box type gas leakage detecting technology and big air-aspiration gun formula inspection
The scientific and reasonable combination of advantage of leakage both techniques, it both can realize low cost and rapidly to gas concentration, gas
Body leakage detects, realize automatically detection the most simultaneously and without manual intervention, but also can be to leakage point
Substantially position.
Gas concentration of the present invention detection device includes offer confined space for placing the inspection of workpiece to be checked
Measuring tank 1；Described detection case 1 is outside equipped with the search gas valve 2 and spike gas being connected with inside workpiece to be checked
Bromhidrosis source 3；Described detection case 1 be externally provided with the vacuum-pumping valve 4 for its confined space being carried out evacuation and
Vacuum pump 5；If in the confined space of described detection case 1 and workpiece to be checked is externally provided with dry gas suction nozzle 8, described
Gas suction nozzle 8 by pipeline and the gas sensor valve 6 being arranged on outside detection case 1, gas suction pump 9 and
Gas sensor 7 connects, and on described each gas suction nozzle, 8 are marked with Position Number, and described gas sensing
Device 7 is provided with the detection numbering corresponding with the Position Number of gas suction nozzle 8.
Further, the distance of described gas suction nozzle 8 and workpiece to be checked 10 is between 6mm-200mm；Described
Gas suction nozzle 8 is arranged on outside the easy leak of workpiece 10 to be checked, so can be with concrete the letting out of quick lock in
Leak source, improves leak detection efficiency.
Specifically, each gas suction nozzle 8 individually connects one group of gas sensor valve 6, gas suction pump 9
And gas sensor 7.
In order to realize intelligent automation control, device of the present invention also includes a Programmable Logic Controller 11, its
Respectively with search gas valve 2, vacuum-pumping valve 4, vacuum pump 5, gas suction pump 9, gas sensor
Valve 6 and gas sensor 7 electrically connect.As shown in Figures 3 and 4, the present embodiment includes three groups of gas mouths 8,
I.e. first gas suction nozzle the 81, second gas suction nozzle 82 and the 3rd gas suction nozzle 83, described first gas
Body suction nozzle 81 is by pipeline and the first gas sensor valve the 61, first gas suction pump 91 and the first gas
Sensor 71 connects, and described second gas suction nozzle 82 is by pipeline and the second gas sensor valve 6, second
Gas suction pump 922 and the second gas sensor 72 connect, and described 3rd gas suction nozzle 83 passes through pipeline
It is connected with the 3rd gas sensor valve the 63, the 3rd gas suction pump 93 and the 3rd gas sensor 73.Can compile
Range controller 11 can be respectively to above-mentioned often group gas suction pump 9, gas sensor valve 6 and gas sensor 7
Be identified correspondence and often organize gas suction nozzle 8, thus by corresponding gas sensor leakage alarm can determine that with
Correspondence gas suction nozzle 8 near leakage point.
Below by way of being specifically used for, the invention will be further described:
First workpiece to be checked is placed in detection case 1；It is controlled by Programmable Logic Controller, opens and take out very
Empty valve 4, carries out evacuation by vacuum pump 5 to confined space, vacuum pressure 100Pa-90000Pa it
Between；Then open search gas valve 2, by search gas source of the gas 3, internal being filled with of workpiece 10 to be checked is shown
Track gas；Open gas sensor valve 6 and gas suction pump 9, suck workpiece to be checked by gas suction nozzle 8
Gas near 10 is delivered to gas sensor 7 and detects.When gas sensor 7 detects a certain gas
The trace gas concentration of suction nozzle 8 reaches to preset leakage value, and Programmable Logic Controller can suck according to this gas
The Position Number of mouth determines the leak position of workpiece 10 to be checked.
Gas concentration of the present invention detection device, utilizes a kind of gas speed of diffusion in another kind of gas
The principle that degree is inversely proportional to the pressure of ambient gas, i.e. utilizes search gas diffusion velocity in a low voltage state more
Fast feature, is evacuated to certain vacuum (vacuum than existing vacuum box type gas leakage detecting technology to confined space
Degree requires low), then utilize the gas suction nozzle near workpiece to be checked to carry out active inspiration conveying gas sensor
(because utilizing the close suction technology of big air-aspiration gun formula leak hunting technology, the transport of search gas can be accelerated,
Therefore gas leak detection technology box to vacuum level requirements relative vacuum is relatively low, such that it is able to the material of the equipment of saving
And manufacturing cost), if workpiece to be checked has leakage, the gas signal of leakage can be collected by gas suction nozzle and lead to
Cross gas sensor to lean out, separately can be to often organizing gas suction pump, gas sensor valve due to Programmable Logic Controller
Door and gas sensor are identified, and may thereby determine that corresponding gas suction nozzle, it is achieved can be more smart
Determine the position of leakage point.Due to relatively low to the vacuum level requirements of detection case, simplify vacuum system
Design, reduce manufacturing cost.
Embodiment 3
As it can be seen in figures 5 and 6, the difference of the present embodiment and embodiment 2 is that gas sensor sets continuously
Putting difference, other structures are the most identical with embodiment 2, particularly as follows: described each gas suction nozzle 8 individually connects
After connecing one group of gas suction pump 9 and gas sensor valve 6, unification is connected with a gas sensor 7.This reality
Execute example and include three groups of gas mouths 8, the i.e. first gas suction nozzle the 81, second gas suction nozzle 82 and the 3rd gas
Suction nozzle 83, described first gas suction nozzle 81 is by pipeline and first gas sensor valve the 61, first gas
Body suction pump 91 and gas sensor 7 connect, and described second gas suction nozzle 82 is by pipeline and the second gas
Feeling device valve the 62, second gas suction pump 92 and gas sensor 7 connect, described 3rd gas suction nozzle
83 are connected with the 3rd gas sensor valve the 63, the 3rd gas suction pump 93 and gas sensor 7 by pipeline,
Above-mentioned gas sensor 7 is an assembly type gas sensor, and it can arrange corresponding gas suction nozzle 8 number
The sense channel of amount, carries out detecting numbering labelling by Programmable Logic Controller 11 to each sense channel, thus
With labelling corresponding gas suction nozzle 8, and then the location to concrete leakage point can be realized.
Other structures of the present embodiment are as described in Example 2.
Claims (10)
1. a gas concentration detection method, it is characterised in that comprise the following steps:
S1: workpiece to be checked is placed in confined space；
S2: in confined space, outside at workpiece to be checked is distributed some gases suction point, and to each gas
Body sucks and clicks on a line position number-mark gas suction point position；
S3: confined space is carried out evacuation, and vacuum pressure is between 100Pa-90000Pa；
S4: inside workpiece to be checked is filled with search gas；
S5: be arranged on the gas sensor outside confined space and carry out gas by gas suction point to sucking gas
Bulk concentration detects, and described gas sensor is provided with the detection numbering corresponding with sucking a Position Number；
S6: when gas sensor detects that the trace gas concentration of a certain gas suction point reaches to preset leakage value,
The leak position of workpiece to be checked can be determined according to the Position Number of this gas suction point.
Gas concentration detection method the most according to claim 1, it is characterised in that: described gas sucks
The distance of point and workpiece to be checked is between 6mm-200mm.
Gas concentration detection method the most according to claim 1, it is characterised in that: described gas sucks
Point is arranged on outside the easy leak of workpiece to be checked.
Gas concentration detection method the most according to claim 1, it is characterised in that: described each gas
Suck point and individually connect a gas sensor.
Gas concentration detection method the most according to claim 1, it is characterised in that: described gas sucks
Point is unified connects a gas sensor.
6. the device of the gas concentration detection being used for the method described in claim 1 that realizes, it is characterised in that:
Include offer confined space for placing the detection case of workpiece to be checked；Described detection case is outside equipped with to be checked
The search gas valve of inside workpiece connection and search gas source of the gas；Described detection case is externally provided with for close to it
Close space and carry out vacuum-pumping valve and the vacuum pump of evacuation；In the confined space of described detection case and work to be checked
If part is externally provided with dry gas suction nozzle, described gas suction nozzle passes through pipeline and the gas sensing being arranged on outside detection case
Device valve, gas suction pump and gas sensor connect, and described each gas suction nozzle is marked with Position Number,
And described gas sensor is provided with the detection numbering corresponding with the Position Number of gas suction nozzle.
The device of gas concentration the most according to claim 6 detection, it is characterised in that: described gas is inhaled
Enter the distance of mouth and workpiece to be checked between 6mm-200mm.
The device of gas concentration the most according to claim 6 detection, it is characterised in that: described gas is inhaled
Enter mouth to be arranged on outside the easy leak of workpiece to be checked.
The device of gas concentration the most according to claim 6 detection, it is characterised in that: each gas is inhaled
Enter mouth and individually connect one group of gas sensor valve, gas suction pump and gas sensor；Or it is described each
Gas suction nozzle is a unified and gas sensor after individually connecting one group of gas sensor valve and gas suction pump
Connect.
The device of gas concentration the most according to claim 6 detection, it is characterised in that: also include one
Programmable Logic Controller, its respectively with search gas valve, vacuum-pumping valve, vacuum pump, gas suction pump,
Gas sensor valve and gas sensor electrical connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076333.7A CN105987796A (en) | 2015-02-12 | 2015-02-12 | Method and device for detecting gas concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510076333.7A CN105987796A (en) | 2015-02-12 | 2015-02-12 | Method and device for detecting gas concentration |
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| CN105987796A true CN105987796A (en) | 2016-10-05 |
Family
ID=57041212
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| CN201510076333.7A Pending CN105987796A (en) | 2015-02-12 | 2015-02-12 | Method and device for detecting gas concentration |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106768688A (en) * | 2016-11-18 | 2017-05-31 | 北京动力机械研究所 | Leakage of seal chamber detection method based on Self-expanding gas |
| CN107991029A (en) * | 2016-10-26 | 2018-05-04 | 广舜检测技术（上海）有限公司 | A kind of lithium ion battery leakage detection apparatus and its leak hunting method using general densimeter |
| CN109738581A (en) * | 2018-12-24 | 2019-05-10 | 国网北京市电力公司 | System, the method and apparatus of the test of gas-detecting device |
| CN113654850A (en) * | 2021-07-14 | 2021-11-16 | 中国辐射防护研究院 | Sampling system and method for detecting leakage rate of seal box based on tracer method |
| WO2022227907A1 (en) * | 2021-04-30 | 2022-11-03 | 宁德时代新能源科技股份有限公司 | Leakage detection method and leakage detection system for box |
| WO2024033053A1 (en) * | 2022-08-12 | 2024-02-15 | Lisa Dräxlmaier GmbH | Method and system for checking for leaks in a battery housing |
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| WO2022227907A1 (en) * | 2021-04-30 | 2022-11-03 | 宁德时代新能源科技股份有限公司 | Leakage detection method and leakage detection system for box |
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| JP7398010B2 (en) | 2021-04-30 | 2023-12-13 | 寧徳時代新能源科技股▲分▼有限公司 | Housing leakage detection method and leakage detection system |
| CN113654850A (en) * | 2021-07-14 | 2021-11-16 | 中国辐射防护研究院 | Sampling system and method for detecting leakage rate of seal box based on tracer method |
| WO2024033053A1 (en) * | 2022-08-12 | 2024-02-15 | Lisa Dräxlmaier GmbH | Method and system for checking for leaks in a battery housing |
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Application publication date: 20161005 |
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