CN107449566A - A kind of leakage detection apparatus for air mass sensor - Google Patents
A kind of leakage detection apparatus for air mass sensor Download PDFInfo
- Publication number
- CN107449566A CN107449566A CN201710765186.3A CN201710765186A CN107449566A CN 107449566 A CN107449566 A CN 107449566A CN 201710765186 A CN201710765186 A CN 201710765186A CN 107449566 A CN107449566 A CN 107449566A
- Authority
- CN
- China
- Prior art keywords
- sensor
- air mass
- air
- connecting plate
- mass sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 18
- 230000004807 localization Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 29
- 238000004378 air conditioning Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000000872 buffer Substances 0.000 description 1
- 229960004424 carbon dioxide Drugs 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The present invention relates to a kind of leakage detection apparatus for air mass sensor, the device includes bottom plate, the sensor positioning mechanism being arranged on bottom plate, air inlet closing means and gas outlet closing means, the air pressure testing agency being connected with the inside of the air inlet closing means and controller electrically connected respectively with air inlet closing means, gas outlet closing means, air pressure testing agency for being arranged on bottom plate and being adapted respectively with sensor positioning mechanism.Compared with prior art, the present invention is in application, air mass sensor need to be only placed in sensor positioning mechanism, the closing of sensor outlet side and sensor inlet end can be realized successively by controller afterwards, vacuumize leak detection process, simple to operate, detection speed is fast, and accuracy of detection is high, device manufacturing cost is low, easy to maintain.
Description
Technical field
The invention belongs to air mass sensor technical field, is related to a kind of leak detection for air mass sensor and fills
Put.
Background technology
Air mass sensor is mainly used in automotive air-conditioning system, can to some high level pollution sources, such as one
Carbonoxide, nitrogen dioxide, ammonia etc., there is high detection sensitivity.When air mass sensor detects such pollution sources
When, the sensor can instruct air-conditioning system to close inlet valve, so that outside the car that poisonous gas is refused, health is provided for occupant
Vehicle environment；And when air quality takes a turn for the better, sensor can instruct air-conditioning system to reopen air inlet function automatically again.In order to protect
The high sensitivity of air mass sensor is demonstrate,proved, it is necessary to be hunted leak to air mass sensor, avoids it from leakage situation being present,
And leakage once be present, will be unable to it is accurate, delicately detect pollution sources.
The operation principle of air mass sensor is generally：Constant light source (such as infraluminescence two is provided with sensor internal
Pole pipe), when air enters sensor internal and passes through light, pollution sources therein can be scattered to it, cause declining for light intensity
Subtracting, the concentration of its relative attenuation rate and pollution sources is proportional, meanwhile, detected with the diagonal opposite side of light source provided with light
Device (such as phototransistor), it can detect the light of contaminated source reflection, and according to intensity of reflected light output pwm signal
(pulse-width signal), so as to judge the concentration of pollution sources.At present, it is existing to be used to detect air mass sensor leakage situation
Equipment be required for greatly from external import, these import equipments have that expensive, cost of upkeep is high, the maintenance disadvantage such as inconvenience
End, using by larger limitation.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide it is a kind of easily operated and into
This low leakage detection apparatus for air mass sensor.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of leakage detection apparatus for air mass sensor, air mass sensor include air mass sensor main body
And sensor inlet end in air mass sensor main body, sensor outlet side are separately positioned on, described device includes
Bottom plate, the sensor positioning mechanism being arranged on bottom plate, it is arranged on bottom plate and is adapted respectively with sensor positioning mechanism
Air inlet closing means and gas outlet closing means, the air pressure testing agency being connected with the inside of air inlet closing means and
The controller electrically connected respectively with air inlet closing means, gas outlet closing means, air pressure testing agency.Air quality is sensed
Device is placed in sensor positioning mechanism, using air inlet closing means, gas outlet closing means respectively by sensor inlet end, biography
Sensor outlet side is closed, and air mass sensor is hunted leak by air pressure testing agency afterwards.
Further, described sensor positioning mechanism include be arranged on bottom plate the first connecting plate, be arranged on first
Cushion block on connecting plate and it is arranged on the first connecting plate end and the locating piece being adapted with sensor inlet end.Cushion block can
It is supported and buffers from bottom to air mass sensor, prevents air mass sensor fail in compression.Air quality is passed
Sensor is placed on cushion block, and by the cooperation of sensor inlet end and locating piece, air mass sensor is positioned, ensured
The stability of leak detection process.
Further, the inlet end jack being adapted with sensor inlet end is offered on described locating piece.Inlet end
The inner wall shape of jack is adapted with the outer wall shape of sensor inlet end, and sensor inlet end is inserted in inlet end jack,
To be positioned to air mass sensor.
Further, described gas outlet closing means include be arranged on bottom plate column, be arranged vertically at
The first cylinder on column side, it is arranged on the first cylinder end and the second connecting plate being connected with the piston drive of the first cylinder
And it is arranged on the second connecting plate bottom and the sealing gasket being adapted with sensor outlet side, the first described cylinder and controller
Electrical connection.The piston of first cylinder is protruding, drives the second connecting plate to sensor outlet end motion, until sealing gasket is tight
It is pressed on sensor outlet side, sensor gas outlet is closed.
As preferable technical scheme, the second described connecting plate is fixedly connected with the piston of the first cylinder.
Further, sealing gasket mounting groove is offered on the bottom surface of the second described connecting plate, described sealing gasket passes through
Sealing gasket mounting groove is fastened on the bottom of the second connecting plate.It ensure that the tightness and stability of sealing.
Further, described air inlet closing means include being arranged on the 3rd connecting plate on bottom plate, in the horizontal direction
The second cylinder for being arranged on the 3rd connecting plate and it is arranged on the second cylinder head portions and is connected with the piston drive of the second cylinder
Seal head, the seal head is adapted with sensor inlet end, and the second described cylinder is electrically connected with the controller.Second cylinder
Piston is protruding, drives seal head to sensor air inlet end motion, and is tightly pressed against on sensor inlet end, and sensor is entered
Gas port is closed.
As preferable technical scheme, described seal head is fixedly connected with the piston of the second cylinder.
Further, the 3rd described connecting plate includes the 3rd connecting plate horizontal part being arranged on bottom plate and is arranged on
The 3rd connecting plate vertical portion on 3rd connecting plate horizontal part, the second described cylinder are arranged on the side of the 3rd connecting plate vertical portion
On face.3rd connecting plate can make the second cylinder keep level state and is fixedly connected with bottom plate.
Further, the inside of described seal head is provided with gas flow, the gas flow by sensor inlet end with
The inside of air mass sensor main body is connected.The the first seal head ventilation being connected with gas flow is offered on seal head
Mouth and the second seal head blow vent, air pressure testing agency are connected by the first seal head blow vent with gas flow, gas stream
Road is connected by the second seal head blow vent with sensor inlet end.
Further, described air pressure testing agency includes the vavuum pump and pressure sensing being connected respectively with gas flow
Device, described controller electrically connect with vavuum pump, pressure sensor respectively.Vavuum pump can be by gas flow by air quality
Air inside sensor main body is taken away, while pressure sensor monitors the air pressure in gas flow in real time.
Further, three-way connection is provided between described air pressure testing agency and seal head, described gas flow leads to
Three-way connection is crossed respectively with vavuum pump, pressure sensor to be connected.
The present invention in practical application, air mass sensor is placed on cushion block, and by sensor inlet end insert into
In the jack of gas end, air mass sensor is positioned；The piston of first cylinder is protruding, sealing gasket is tightly pressed against biography
On sensor outlet side, sensor outlet side is closed；The piston of second cylinder is protruding, seal head is tightly pressed against sensor
On inlet end, sensor inlet end is closed；The air of air mass sensor body interior is taken away by vavuum pump, and led to
Over-pressed force snesor monitors the atmospheric pressure value of air mass sensor body interior in real time, to judge whether air mass sensor leaks
Gas.
As preferable technical scheme, described device also includes the alarm being electrically connected with the controller.If after vacuumizing,
The atmospheric pressure value size of air mass sensor body interior then shows that air mass sensor has gas leakage outside preset range
Situation, now controller send instruction, alarm is sent alarm.
As further preferred technical scheme, described controller is PLC.
Compared with prior art, the invention has the characteristics that：
1) air mass sensor need to be only placed in sensor positioning mechanism, can be realized successively by controller afterwards
The closing of sensor outlet side and sensor inlet end, leak detection process is vacuumized, simple to operate, detection speed is fast, accuracy of detection
It is high；
2) apparatus structure is simple, and manufacturing cost is low, easy to maintain, has a wide range of application.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention；
Fig. 2 is the structural representation of air pressure testing agency in the present invention；
Description of symbols in figure：
1-cushion block, the 2-the first connecting plate, 3-locating piece, 4-column, the 5-the first cylinder, the 6-the second connecting plate, 7-
Sealing gasket, the 8-the three connecting plate, the 801-the three connecting plate horizontal part, the 802-the three connecting plate vertical portion, the 9-the second cylinder,
10-seal head, 11-bottom plate, 12-air mass sensor, 1201-air mass sensor main body, 1202-sensor
Inlet end, 1203-sensor outlet side, 13-gas flow, 14-vavuum pump, 15-pressure sensor, 16-three connect
Head.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
Embodiment：
Air mass sensor 12 includes air mass sensor main body 1201 and is separately positioned on air quality sensing
Sensor inlet end 1202, sensor outlet side 1203 in device main body 1201.
A kind of leakage detection apparatus for air mass sensor as shown in Figure 1 includes bottom plate 11, is arranged on bottom plate 11
Sensor positioning mechanism, the air inlet closing means that are arranged on bottom plate 11 and are adapted respectively with sensor positioning mechanism and
Gas outlet closing means, the air pressure testing agency being connected with the inside of air inlet closing means and respectively with air inlet close
Mechanism, gas outlet closing means, the controller of air pressure testing agency electrical connection.
Wherein, sensor positioning mechanism include be arranged on bottom plate 11 the first connecting plate 2, be arranged on the first connecting plate 2
On cushion block 1 and be arranged on the end of the first connecting plate 2 and the locating piece 3 being adapted with sensor inlet end 1202.Locating piece 3
On offer the inlet end jack being adapted with sensor inlet end 1202.
Gas outlet closing means include be arranged on bottom plate 11 column 4, be arranged vertically on the side of column 4
First cylinder 5, the second connecting plate 6 for being arranged on the bottom of the first cylinder 5 and being connected with the piston drive of the first cylinder 5 and setting
In the bottom of the second connecting plate 6 and the sealing gasket 7 that is adapted with sensor outlet side 1203, the first cylinder 5 is electrically connected with the controller.
Sealing gasket mounting groove is offered on the bottom surface of second connecting plate 6, sealing gasket 7 is fastened on the second connecting plate by sealing gasket mounting groove
6 bottom.
Air inlet closing means include be arranged on bottom plate 11 the 3rd connecting plate 8, be arranged horizontally at the 3rd company
The second cylinder 9 on fishplate bar 8 and it is arranged on the end of the second cylinder 9 and the seal head being connected with the piston drive of the second cylinder 9
10, the seal head 10 is adapted with sensor inlet end 1202, and the second cylinder 9 is electrically connected with the controller.3rd connecting plate 8 includes
The 3rd connecting plate horizontal part 801 being arranged on bottom plate 11 and the 3rd connection being arranged on the 3rd connecting plate horizontal part 801
Plate vertical portion 802, the second cylinder 9 are arranged on the side of the 3rd connecting plate vertical portion 802.The inside of seal head 10 is provided with gas
Runner 13, the gas flow 13 are connected by sensor inlet end 1202 with the inside of air mass sensor main body 1201.
As shown in Fig. 2 air pressure testing agency includes the vavuum pump 14 and pressure sensing being connected respectively with gas flow 13
Device 15, controller electrically connect with vavuum pump 14, pressure sensor 15 respectively.Three are provided between air pressure testing agency and seal head 10
Pass joint 16, gas flow 13 are connected with vavuum pump 14, pressure sensor 15 respectively by three-way connection 16.Device also includes
The alarm being electrically connected with the controller.
In practical application, air mass sensor 12 is placed on cushion block 1, and by sensor inlet end 1202 insert into
In the jack of gas end, air mass sensor 12 is positioned；The piston of first cylinder 5 is protruding, sealing gasket 7 is tightly pressed
On sensor outlet side 1203, sensor outlet side 1203 is closed；The piston of second cylinder 9 is protruding, makes seal head
10 are tightly pressed against on sensor inlet end 1202, and sensor inlet end 1202 is closed；Vavuum pump 14 starts, and starts to extract air
Air inside mass sensor 12, the time for extracting air are set as after 3 seconds, 3 seconds that pressure sensor 15 detects pressure
Numerical value.Between being -850Mbar to -950Mbar by normal pressure setting value, if measured value exceeds this standard figures
Scope, alarm equipment alarm, show that air mass sensor 12 has gas leakage situation, sealing property is determined as unqualified；Such as fruit
Numerical value is surveyed in standard scale, shows that air mass sensor 12 is qualified.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using invention.
Person skilled in the art obviously can easily make various modifications to these embodiments, and described herein general
Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel do not depart from improvement that scope made and modification all should be the present invention's according to the announcement of the present invention
Within protection domain.
Claims (10)
1. a kind of leakage detection apparatus for air mass sensor, air mass sensor (12) includes air mass sensor master
Body (1201) and the sensor inlet end (1202), the sensor that are separately positioned in air mass sensor main body (1201) go out
Gas end (1203), it is characterised in that described device includes bottom plate (11), the sensor localization machine being arranged on bottom plate (11)
Structure, it is arranged on the air inlet closing means and gas outlet closing machine being adapted respectively on bottom plate (11) and with sensor positioning mechanism
Structure, the air pressure testing agency being connected with the inside of air inlet closing means and respectively with air inlet closing means, gas outlet
Closing means, the controller of air pressure testing agency electrical connection.
A kind of 2. leakage detection apparatus for air mass sensor according to claim 1, it is characterised in that described biography
Sensor detent mechanism includes the first connecting plate (2) being arranged on bottom plate (11), the cushion block being arranged on the first connecting plate (2)
(1) the first connecting plate (2) end and the locating piece (3) being adapted with sensor inlet end (1202) are arranged on and.
3. a kind of leakage detection apparatus for air mass sensor according to claim 2, it is characterised in that described determines
The inlet end jack being adapted with sensor inlet end (1202) is offered on position block (3).
4. a kind of leakage detection apparatus for air mass sensor according to claim 1, it is characterised in that described goes out
Gas port closing means include the column (4) being arranged on bottom plate (11), be arranged vertically on column (4) side first
Cylinder (5), the second connecting plate (6) for being arranged on the first cylinder (5) bottom and being connected with the piston drive of the first cylinder (5) and
It is arranged on the second connecting plate (6) bottom and the sealing gasket (7) being adapted with sensor outlet side (1203), the first described cylinder
(5) it is electrically connected with the controller.
A kind of 5. leakage detection apparatus for air mass sensor according to claim 4, it is characterised in that described
Sealing gasket mounting groove is offered on the bottom surface of two connecting plates (6), described sealing gasket (7) is fastened on by sealing gasket mounting groove
The bottom of two connecting plates (6).
6. a kind of leakage detection apparatus for air mass sensor according to claim 1, it is characterised in that described enters
Gas port closing means include be arranged on bottom plate (11) the 3rd connecting plate (8), be arranged horizontally at the 3rd connecting plate (8)
On the second cylinder (9) and be arranged on the second cylinder (9) end and the seal head being connected with the piston drive of the second cylinder (9)
(10), the seal head (10) is adapted with sensor inlet end (1202), and described the second cylinder (9) is electrically connected with the controller.
A kind of 7. leakage detection apparatus for air mass sensor according to claim 6, it is characterised in that described
Three connecting plates (8) include the 3rd connecting plate horizontal part (801) being arranged on bottom plate (11) and are arranged on the 3rd connecting plate water
The 3rd connecting plate vertical portion (802) on flat portion (801), described the second cylinder (9) are arranged on the 3rd connecting plate vertical portion
(802) on side.
8. a kind of leakage detection apparatus for air mass sensor according to claim 6, it is characterised in that described is close
The inside of end socket (10) is provided with gas flow (13), and the gas flow (13) passes through sensor inlet end (1202) and air quality
The inside of sensor main body (1201) is connected.
A kind of 9. leakage detection apparatus for air mass sensor according to claim 8, it is characterised in that described gas
Pressure testing agency includes the vavuum pump (14) and pressure sensor (15) being connected respectively with gas flow (13), described control
Device electrically connects with vavuum pump (14), pressure sensor (15) respectively.
10. a kind of leakage detection apparatus for air mass sensor according to claim 9, it is characterised in that described
Three-way connection (16) is provided between air pressure testing agency and seal head (10), described gas flow (13) passes through three-way connection
(16) it is connected respectively with vavuum pump (14), pressure sensor (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710765186.3A CN107449566A (en) | 2017-08-30 | 2017-08-30 | A kind of leakage detection apparatus for air mass sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710765186.3A CN107449566A (en) | 2017-08-30 | 2017-08-30 | A kind of leakage detection apparatus for air mass sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107449566A true CN107449566A (en) | 2017-12-08 |
Family
ID=60494637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710765186.3A Pending CN107449566A (en) | 2017-08-30 | 2017-08-30 | A kind of leakage detection apparatus for air mass sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107449566A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061626A (en) * | 2017-12-15 | 2018-05-22 | 芜湖致通汽车电子有限公司 | A kind of clamping device and its application method for sensor air-leakage test |
| CN114061841A (en) * | 2020-07-31 | 2022-02-18 | 西德福液压件(上海)有限公司 | Tool for detecting leakage performance of filter head |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202757743U (en) * | 2012-08-07 | 2013-02-27 | 江西科伦医疗器械制造有限公司 | Infusion needle leak detection device |
| CN105628310A (en) * | 2016-02-17 | 2016-06-01 | 亿和精密工业（苏州）有限公司 | Sealing performance testing device and method |
| CN106482915A (en) * | 2016-12-15 | 2017-03-08 | 四川红光汽车机电有限公司 | A kind of air inlet relief valve adnexa assembly leakage flow automatic checkout equipment |
-
2017
- 2017-08-30 CN CN201710765186.3A patent/CN107449566A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202757743U (en) * | 2012-08-07 | 2013-02-27 | 江西科伦医疗器械制造有限公司 | Infusion needle leak detection device |
| CN105628310A (en) * | 2016-02-17 | 2016-06-01 | 亿和精密工业（苏州）有限公司 | Sealing performance testing device and method |
| CN106482915A (en) * | 2016-12-15 | 2017-03-08 | 四川红光汽车机电有限公司 | A kind of air inlet relief valve adnexa assembly leakage flow automatic checkout equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061626A (en) * | 2017-12-15 | 2018-05-22 | 芜湖致通汽车电子有限公司 | A kind of clamping device and its application method for sensor air-leakage test |
| CN114061841A (en) * | 2020-07-31 | 2022-02-18 | 西德福液压件(上海)有限公司 | Tool for detecting leakage performance of filter head |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106768669B (en) | Air tightness testing device of automobile tire pressure detector | |
| CN204278043U (en) | Aseptic processing isolator | |
| US20220410049A1 (en) | Sealing arrangement, filter and filter housing, method of monitoring leak tightness, and leak tightness monitoring system | |
| CN107449566A (en) | A kind of leakage detection apparatus for air mass sensor | |
| CN104359636A (en) | Water tank gas tightness detecting system | |
| CN203337347U (en) | Multi cavity air tightness test device | |
| CN108318405A (en) | Filter membrane/filter cylinder arresting efficiency and resistance detection device | |
| CN204301947U (en) | A kind of Key works Drug packing band package seal checker | |
| CN206756789U (en) | A kind of more gas detecting instruments | |
| CN103291599B (en) | Electric automobile electronic water pump leakage pressure detection means and the detection method using the device | |
| CN207147730U (en) | A kind of leakage detection apparatus for air mass sensor | |
| CN103123290B (en) | A kind of detection bubble-tight equipment of wheel hub and application process thereof | |
| CN104019949B (en) | Side leakage device for air inlet pipe | |
| CN102243130A (en) | Gas tightness detection device of high speed train | |
| CN111855539A (en) | Mask particulate matter filtration efficiency testing arrangement | |
| CN102095559B (en) | Calibration device of on-line SF6 (sulfur hexafluoride)-O2 leak monitoring alarm | |
| CN107462371B (en) | Deposit lid gas tightness testboard | |
| CN217155753U (en) | Pipeline air tightness detection device for hydrogen fuel cell engine system | |
| CN206656839U (en) | A kind of monitoring system of detectable ward equipment belt pipeline gas leakage | |
| CN202057466U (en) | Device for detecting airtightness of high speed train | |
| CN201926546U (en) | On-site verification device for SF6-O2 leakage monitoring and warning device | |
| CN204241179U (en) | Water tank gas tightness detecting system | |
| CN205958192U (en) | Airtightness detection equipment | |
| CN203745144U (en) | Sealed type safety valve airtightness test verifying apparatus | |
| CN204855117U (en) | Container seals nature leak hunting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171208 |