CN1544902A - Sample piece with adjustable gas leakage amount and detection method - Google Patents
Sample piece with adjustable gas leakage amount and detection method Download PDFInfo
- Publication number
- CN1544902A CN1544902A CNA2003101063067A CN200310106306A CN1544902A CN 1544902 A CN1544902 A CN 1544902A CN A2003101063067 A CNA2003101063067 A CN A2003101063067A CN 200310106306 A CN200310106306 A CN 200310106306A CN 1544902 A CN1544902 A CN 1544902A
- Authority
- CN
- China
- Prior art keywords
- leakage
- gas
- anger
- core
- scale
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title abstract description 8
- 239000000344 soap Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000007789 sealing Methods 0.000 claims abstract description 9
- 235000015111 chews Nutrition 0.000 claims description 10
- 241001347978 Major minor Species 0.000 claims description 9
- 230000001055 chewing effect Effects 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 230000000295 complement effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000004088 simulation Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 36
- 238000010586 diagram Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000012113 quantitative test Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Images
Landscapes
- Examining Or Testing Airtightness (AREA)
Abstract
The invention relates to a sample piece with adjustable gas leakage amount and a detection method, wherein the device comprises a plug rod 4, a leakage core 5, an air outlet nozzle external thread 7, a fixed pin 8, an auxiliary ruler barrel 9 and a movable sealing ring 10 which form a rotary moving assembly, and the rotary moving assembly rotates inside and outside a relative static assembly formed by an air inlet nozzle 1, a filter core 2, a plug sleeve 3 and a main ruler internal thread 6. The greater the depth to which the sleeve 3 and the stem 4 are screwed, the lower the pressure of the gas flowing through the bushing 5. All rotation and movement can be registered by the main scale internal threads 6 and the secondary scale drum 9. When the recording position is repeated, there is a corresponding amount of gas leakage. The detection method can carry out quantitative equivalence and simulation on micro leakage of various volumes by jointly using the adjustable sample piece of the gas leakage rate and the soap film flowmeter, and is a necessary method for identifying the airtight leakage detector. The adjustable sample piece of gas leakage amount leaks the amount of leakage stably, adjustable, and has the scale, and low in manufacturing cost, detection and demarcation convenience.
Description
Technical field
The present invention relates to gas Leak Detection field, particularly a kind of adjustable sample component and detection method.
Background technology
Jumbo airtightness measurement does not also have proven technique and product in present stage, is big volume to a great extent, and the measurement of tiny leakage amount and calibration technique and product be development and maturation not.And traditional measuring method and technology can only be qualitative or sxemiquantitative measure and demarcate, and almost can not quantitative test to tiny leakage.
The impermeability tiny leakage amount exemplar that Japanese Feitian company produces the Tianjin Feitian is acted on behalf of by China, and its structure is the long tube of minute diameter, and its amount of leakage can calculate by experimental formula, but the manufacturing process complexity, the price comparison costliness.
Domestic traditional way is to get micron-sized aperture with laser on tinsel, and the aperture paillon foil is enclosed in the gas circuit, allows gas leak from aperture, and it is in the following airtightness measurement of 0. 5 MPas that this kind exemplar is usually used in pressure.For the situation of pressure greater than a MPa, its leakage rate is bigger, so that can not be called the tiny leakage amount again, and leakage rate can not be adjusted.
Summary of the invention
The exemplar that the purpose of this invention is to provide a kind of low leakage, it is adjustable that this exemplar belongs to flow, and cheap for manufacturing cost, detect and demarcate convenient, in order to demarcate and calibration high-pressure large-capacity low leakage test instrumentation.Also can purify gases at high pressure, throttling, voltage stabilizing, current stabilization, for soap film flowmeter provides the constant flow source of the gas.
Purpose of the present invention is achieved by following technical proposals:
A kind of adjustable sample component, comprise filter core (2), plug sleeve (3), stopper rod (4), leak core (5), main scale internal thread (6), give vent to anger chew external thread (7), secondary chi tube (9) is characterized in that:
The structure of the adjustable exemplar of this gas tiny leakage amount is that the rotation moving assembly mechanical connection by one group of relative stationary components and another group constitutes, and the interior inner rotary that the rotation moving assembly has constituted relative to stationary components moves;
Described relative stationary components comprises that air inlet chews (1), filter core (2), plug sleeve (3), main scale internal thread (6), and described rotation moving assembly comprises stopper rod (4), leaks core (5), gives vent to anger and chew external thread (7), fixed pin (8), secondary chi tube (9), the O-ring seal (10) of living;
Relatively in the stationary components: air inlet is chewed filter core (2) composition air strainer is installed in (1), air inlet in the air strainer is chewed (1) and is connected by being threaded into plug sleeve (3), and adding large sealing packing ring (12), plug sleeve (3) is spacing to filter core (2), main scale internal thread (6) cylindrical is carved with main scale vertically, it with plug sleeve (3) with being threaded, the centre is added with small sealing ring (11);
In the rotation moving assembly: stopper rod (4) inserts the centre position of plug sleeve (3) on one side, and another side is with leakage core (5) and give vent to anger and chew external thread (7) and be tightly fixed together by mechanical means;
Between plug sleeve (3) and the stopper rod (4) micron-sized gap is arranged, the length and the leakage rate in its gap are inversely proportional to, and flow to leaking core (5) direction in the micron-sized gap that the air communication of the filter core of flowing through (2) is crossed between plug sleeve (3) and the stopper rod (4);
Leak core (5) and have micropore and band elasticity, it is installed on the position of the end of keeping right of stopper rod (4), and with stopper rod (4), give vent to anger and chew external thread (7) rotation and move, when it was extruded, micropore and gap smaller were to closing;
The O-ring seal (10) of living is fixed in rotation moving assembly internal layer gives vent to anger and chews in the groove of external thread (7), air-flow can only be flow through leak core (5) and stopper rod (4) to chew being connected in the slit of external thread (7) with giving vent to anger, and chews discharge through giving vent to anger;
The rotation outer field secondary chi tube of moving assembly (9) is carved with the complementary scale scale along the cylinder left side, and chews external thread (7) and be connected with giving vent to anger with fixed pin (8); Give vent to anger when chewing external thread (7) when turn, secondary chi tube (9) rotates thereupon, all rotations with move, can be write down its position by main scale internal thread (6) and secondary chi tube (9), the leakage rate of corresponding gas is just arranged when repeating its record position.
Described leakage core (5) can be by the interior macromolecular material moulding that skeleton is arranged, also can be with any leakproofing material moulding.
A kind of adjustable sample component is characterized in that the method that the gas leakage amount detects:
At first gas impermeability tiny leakage amount exemplar is demarcated:
1) gas tiny leakage amount exemplar being connected on constant pressure is P
0Source of the gas and soap film flowmeter between;
2) major-minor chi scale is adjusted on a certain scale in 0.00～25.00, opens gas source switch;
3) write down the respective value that major-minor chi scale value and soap film flowmeter are measured;
4) being made at pressure is P
0The time scale and the corresponding tables of corresponding minute leakage flow;
Next is operation and using method:
Gas tiny leakage amount exemplar air inlet that a. demarcation is finished and that make the corresponding tables of scale and corresponding minute leakage flow is chewed on the quantity of gas leakage testing tool that being threaded into of (1) will demarcate, and must not there be leakage the junction;
B. write down major-minor chi scale value;
C. find leakage rate according to the corresponding tables of scale value calibration and corresponding minute leakage flow, can demarcate the quantity of gas leakage testing tool.
The method flow of detected gas leakage rate is: after exemplar access gas pressure intensity is the volume of Po, filter through filter core (2), when adjusting is given vent to anger when chewing external thread (7), plug sleeve (3) is adjusted with the length of the gas gap that stopper rod (4) forms, and at this moment corresponding main scale internal thread (6) position is arranged;
Continue to regulate, leakage core (5) is extruded or loosens, its sectional area that forms the stream pipe diminishes or enlarges, and micro leakage at this moment is adjusted, and numeral corresponding this moment of the condition of the calibration summary of main scale internal thread (6) and secondary chi tube (9) is the micro leakage of Po gas pressure intensity; The micro leakage that exemplar was regulated is chewed external thread (7) and is discharged or connect soap film flowmeter through giving vent to anger.
The gas of exemplar output tiny flow quantity inserts the input port of soap film flowmeter, at this moment pushes rubber sphere B and forms soap-film, and when soap-film arrived the zero graduation of soap-film pipe T, manual time-keeping began;
Volume with leakage rate increases, and soap-film rises, and when arriving volume V constantly, manual time-keeping stops, and the time that this moment, stopwatch was counted is to have leaked the used time of volume V, is micro leakage Q with volume divided by the time.
The degree of depth that plug sleeve (3) and stopper rod (4) screw in is big more, and the gas pressure intensity of the core (5) Lou of flowing through is more little.When to leak core (5) when being extruded, give vent to anger the air-flow of chewing outflow be trace even do not have gas to flow out.All rotations can be write down its position by main scale internal thread (6) and secondary chi tube (9) with mobile, and the leakage rate of corresponding gases at high pressure is just arranged when repeating its record position.
The adjustable sample component beneficial effect is:
1. the present invention makes the air that flows through self more clean owing to carry air strainer, and instrument also is protected.
2. the length and the leakage rate of the plug sleeve that stopper rod of the present invention is deep are inversely proportional to, because adjustable in length, so also scalable of leakage rate.
3. when leakage core of the present invention is extruded, can provide atomic little quantity of gas leakage.
4. of the present invention give vent to anger to chew can connect soap film flowmeter and demarcate mutually and verify.
5. corresponding leakage rate can corresponding corresponding scale, and is convenient, reliable, cheap.
Description of drawings
Fig. 1 is the complete section structural drawing of adjustable sample component;
Fig. 2 is the outward appearance front view of adjustable sample component;
Fig. 3 is the detection method synoptic diagram of adjustable sample component;
Fig. 4 is the work block diagram of adjustable sample component;
The process flow diagram that Fig. 5 demarcates for adjustable sample component.
Embodiment
The invention will be further described below in conjunction with Fig. 1, Fig. 2 and Fig. 3:
In Fig. 1: adjustable sample component comprises: air inlet chews 1, filter core 2, plug sleeve 3, stopper rod 4, leak core 5, main scale internal thread 6, give vent to anger and chew external thread 7, fixed pin 8, secondary chi tube 9, live O-ring seal 10, small sealing ring 11, large sealing packing ring 12, wherein:
Air inlet is chewed and is put into filter core 2 composition air strainers in 1.
Plug sleeve 3 connects gas and chews 1 by being threaded into, and adds large sealing packing ring 12.Plug sleeve 3 left ends are spacing to filter core 2.
The high pressure draught of filter core 2 of flowing through is mobile to leaking core 5 directions by the micron-sized gap between plug sleeve 3 and the stopper rod 4, and the formation length and the leakage rate in gap are inversely proportional to.
Stopper rod 4 with leak core 5 and give vent to anger and chew external thread 7 together by mechanical method fixation.
Main scale internal thread 6 cylindricals are carved with main scale vertically, and it is threaded with plug sleeve 3 usefulness, and the centre is added with small sealing ring 11.
Leak core 5 and be by the interior macromolecular material moulding that skeleton arranged, have micropore and band elasticity, it is placed on the stopper rod 4, and with stopper rod 4, give vent to anger and chew external thread 7 rotations and move, micropore and relevant tolerance clearance diminish to closing when it is extruded.
The O-ring seal 10 of living is fixed in to give vent to anger to be chewed in the groove of external thread 7, makes air-flow only be permitted to flow through to leak core 5 and stopper rod 4 to chew being connected in the slit of external thread 7 with giving vent to anger, and chews discharge through giving vent to anger.
In Fig. 2: secondary chi tube 9 is carved with the complementary scale scale along cylinder one end, and chews external thread 7 and be connected with giving vent to anger with fixed pin 8.Give vent to anger when chewing external thread 7 when turn, secondary chi tube 9 rotates thereupon.
Exemplar is calibrated and is demarcated by method shown in Figure 3.In Fig. 3: P
0The expression pressure-stabilized air source, being connected what occupy the centre position with valve, pressure-stabilized air source and soap film flowmeter is adjustable sample component, T represents that soap-film pipe, S represent that scale, B represent rubber sphere on the soap film flowmeter.
Provide concrete scaling method below and manipulate explanation:
At first gas impermeability tiny leakage amount exemplar is demarcated:
1) gas tiny leakage amount exemplar being connected on constant pressure is P
0Source of the gas and soap film flowmeter between;
2) major-minor chi scale is adjusted on a certain scale in 0.00～25.00, opens gas source switch;
3) write down the respective value that major-minor chi scale value and soap film flowmeter are measured;
4) being made at pressure is P
0The time scale and the corresponding tables of corresponding minute leakage flow.
Next is operation and using method explanation:
1 be threaded on the quantity of gas leakage testing tool that will demarcate chewed in gas tiny leakage amount exemplar air inlet that a. demarcation is finished and that make the corresponding tables of scale and corresponding minute leakage flow, and must not there be leakage the junction;
B. write down major-minor chi scale value;
C. find leakage rate according to the corresponding tables of scale value calibration and corresponding minute leakage flow, can demarcate the quantity of gas leakage testing tool.
Fig. 4 is the work block diagram of adjustable sample component.
Block representation shown in Figure 4: after exemplar inserts gas pressure intensity and is the volume of Po, filter,, at this moment corresponding main scale internal thread 6 positions are arranged when the give vent to anger length of the gas gap that plug sleeve 3 and stopper rod 4 form when chewing external thread 7 of adjusting is adjusted through filter core 2.Continue to regulate, leakage core 5 is extruded or loosens, and its sectional area that forms the stream pipe diminishes or enlarges, and micro leakage at this moment is adjusted, and numeral corresponding this moment of the condition of the calibration summary of main scale internal thread 6 and secondary chi tube 9 is the micro leakage of Po gas pressure intensity.The micro leakage that exemplar was regulated is chewed external thread 7 and is discharged or connect soap film flowmeter through giving vent to anger.
The process flow diagram that Fig. 5 demarcates for adjustable sample component.
" Fig. 3 provides the method for demarcation; further set forth with block diagram shown in Figure 5: the gas of the tiny flow quantity of exemplar output inserts the input port of soap film flowmeter; at this moment push rubber sphere B, form soap-film, and manual time-keeping begins when soap-film arrives the zero graduation of soap-film pipe T; the volume with leakage rate increases; soap-film rises, and when arriving volume V constantly, manual time-keeping stops; the time that this moment, stopwatch was counted is to have leaked the used time of volume V, is micro leakage Q with volume divided by the time.
Claims (3)
1. adjustable sample component, comprise filter core (2), plug sleeve (3), stopper rod (4), leak core (5), main scale internal thread (6), give vent to anger chew external thread (7), secondary chi tube (9) is characterized in that:
The structure of the adjustable exemplar of this gas tiny leakage amount is that the rotation moving assembly mechanical connection by one group of relative stationary components and another group constitutes, and the interior inner rotary that the rotation moving assembly has constituted relative to stationary components moves;
Described relative stationary components comprises that air inlet chews (1), filter core (2), plug sleeve (3), main scale internal thread (6), and described rotation moving assembly comprises stopper rod (4), leaks core (5), gives vent to anger and chew external thread (7), fixed pin (8), secondary chi tube (9), the O-ring seal (10) of living;
Relatively in the stationary components: air inlet is chewed filter core (2) composition air strainer is installed in (1), air inlet in the air strainer is chewed (1) and is connected by being threaded into plug sleeve (3), and adding large sealing packing ring (12), plug sleeve (3) is spacing to filter core (2), main scale internal thread (6) cylindrical is carved with main scale vertically, it with plug sleeve (3) with being threaded, the centre is added with small sealing ring (11);
In the rotation moving assembly: stopper rod (4) inserts the centre position of plug sleeve (3) on one side, and another side is with leakage core (5) and give vent to anger and chew external thread (7) and be tightly fixed together by mechanical means;
Between plug sleeve (3) and the stopper rod (4) micron-sized gap is arranged, the length and the leakage rate in its gap are inversely proportional to, and flow to leaking core (5) direction in the micron-sized gap that the air communication of the filter core of flowing through (2) is crossed between plug sleeve (3) and the stopper rod (4);
Leak core (5) and have micropore and band elasticity, it is installed on the position of the end of keeping right of stopper rod (4), and with stopper rod (4), give vent to anger and chew external thread (7) rotation and move, when it was extruded, micropore and gap smaller were to closing;
The O-ring seal (10) of living is fixed in rotation moving assembly internal layer gives vent to anger and chews in the groove of external thread (7),
Air-flow can only be flow through leak core (5) and stopper rod (4) to chew being connected in the slit of external thread (7), and chew discharge through giving vent to anger with giving vent to anger;
The rotation outer field secondary chi tube of moving assembly (9) is carved with the complementary scale scale along the cylinder left side, and chew external thread (7) and be connected with giving vent to anger with fixed pin (8), when turn is given vent to anger when chewing external thread (7), secondary chi tube (9) rotates thereupon, all rotations can be write down its position by main scale internal thread (6) and secondary chi tube (9) with mobile.
2. a kind of adjustable sample component as claimed in claim 1 is characterized in that: described leakage core (5) can be by the interior macromolecular material moulding that skeleton is arranged, also can be with any micro-seepage forming materials.
3. an a kind of adjustable sample component as claimed in claim 1 is characterized in that the method that the gas leakage amount detects:
At first gas impermeability tiny leakage amount exemplar is demarcated:
1) gas tiny leakage amount exemplar being connected on constant pressure is P
0Source of the gas and soap film flowmeter between;
2) major-minor chi scale is adjusted on a certain scale in 0.00～25.00, opens gas source switch;
3) write down the respective value that major-minor chi scale value and soap film flowmeter are measured;
4) being made at pressure is P
0The time scale and the corresponding tables of corresponding minute leakage flow;
Next is operation and using method:
Gas tiny leakage amount exemplar air inlet that a. demarcation is finished and that make the corresponding tables of scale and corresponding minute leakage flow is chewed on the quantity of gas leakage testing tool that being threaded into of (1) will demarcate, and must not there be leakage the junction;
B. write down major-minor chi scale value;
C. find leakage rate according to the corresponding tables of scale value calibration and corresponding minute leakage flow, can be right
The quantity of gas leakage testing tool is demarcated;
The method flow of detected gas leakage rate is: after exemplar access gas pressure intensity is the volume of Po, filter through filter core (2), when adjusting is given vent to anger when chewing external thread (7), plug sleeve 3 is adjusted with the length of the gas gap that stopper rod (4) forms, and at this moment corresponding main scale internal thread (6) position is arranged;
Continue to regulate, leakage core (5) is extruded or loosens, its sectional area that forms the stream pipe diminishes or enlarges, and micro leakage at this moment is adjusted, and numeral corresponding this moment of the condition of the calibration summary of main scale internal thread (6) and secondary chi tube (9) is the micro leakage of Po gas pressure intensity; The micro leakage that exemplar was regulated is chewed external thread (7) and is discharged or connect soap film flowmeter through giving vent to anger;
The gas of exemplar output tiny flow quantity inserts the input port of soap film flowmeter, at this moment pushes rubber sphere B and forms soap-film, and when soap-film arrived the zero graduation of soap-film pipe T, manual time-keeping began;
Volume with leakage rate increases, and soap-film rises, and when arriving volume V constantly, manual time-keeping stops, and the time that this moment, stopwatch was counted is to have leaked the used time of volume V, is micro leakage Q with volume divided by the time;
The degree of depth that plug sleeve (3) and stopper rod (4) screw in is big more, and the gas pressure intensity of the core (5) Lou of flowing through is more little; When to leak core (5) when being extruded, give vent to anger the air-flow of chewing outflow be trace even do not have gas to flow out; All rotations can be write down its position by main scale internal thread (6) and secondary chi tube (9) with mobile, and the leakage rate of corresponding gas is just arranged when repeating its record position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106306 CN1227519C (en) | 2003-11-12 | 2003-11-12 | Sample piece with adjustable gas leakage amount and detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310106306 CN1227519C (en) | 2003-11-12 | 2003-11-12 | Sample piece with adjustable gas leakage amount and detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1544902A true CN1544902A (en) | 2004-11-10 |
| CN1227519C CN1227519C (en) | 2005-11-16 |
Family
ID=34334088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310106306 Expired - Fee Related CN1227519C (en) | 2003-11-12 | 2003-11-12 | Sample piece with adjustable gas leakage amount and detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1227519C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445311A (en) * | 2010-10-15 | 2012-05-09 | 安徽中科智能高技术有限责任公司 | Gas-adjustable flow meter |
| CN108225972A (en) * | 2012-12-21 | 2018-06-29 | 安尼奥利亚公司 | For determining the device and method of the size of leakage hole in sample |
| CN111397804A (en) * | 2020-04-08 | 2020-07-10 | 无锡烨隆精密机械股份有限公司 | Manufacturing method of volute leakage failure sample |
| CN113405729A (en) * | 2021-07-09 | 2021-09-17 | 安徽中科智能高技术有限责任公司 | Leakage-amount-adjustable leak hole based on laminar flow principle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103376188A (en) * | 2012-04-18 | 2013-10-30 | 天纳克-埃贝赫（大连）排气系统有限公司 | Apparatus for detecting airtight leakage detector by using airtight limit sample |
-
2003
- 2003-11-12 CN CN 200310106306 patent/CN1227519C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102445311A (en) * | 2010-10-15 | 2012-05-09 | 安徽中科智能高技术有限责任公司 | Gas-adjustable flow meter |
| CN102445311B (en) * | 2010-10-15 | 2013-09-25 | 安徽中科智能高技术有限责任公司 | Gas-adjustable flow meter |
| CN108225972A (en) * | 2012-12-21 | 2018-06-29 | 安尼奥利亚公司 | For determining the device and method of the size of leakage hole in sample |
| CN108225972B (en) * | 2012-12-21 | 2021-04-09 | 安尼奥利亚公司 | Apparatus and method for determining the size of a leak in a sample |
| CN111397804A (en) * | 2020-04-08 | 2020-07-10 | 无锡烨隆精密机械股份有限公司 | Manufacturing method of volute leakage failure sample |
| CN113405729A (en) * | 2021-07-09 | 2021-09-17 | 安徽中科智能高技术有限责任公司 | Leakage-amount-adjustable leak hole based on laminar flow principle |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1227519C (en) | 2005-11-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101393116B (en) | Demarcating apparatus for gas concentration detector and linearity demarcating method | |
| CN201476821U (en) | Double-channel pore plate gas flow rate measuring device with bypass bridge path | |
| CN100424476C (en) | Valve assembly | |
| CN1227519C (en) | Sample piece with adjustable gas leakage amount and detection method | |
| CN107063775A (en) | A kind of simple type deep soil gas sampler and its method for sampling | |
| CN1945232A (en) | Measuring method and its device for external leading sampling of pipeline gas flow | |
| BG101487A (en) | Device for liquid sampling | |
| US20120036948A1 (en) | Assembly device for a measuring probe for measuring process variables in a process | |
| CN2643304Y (en) | A gas leakage quantity adjustable sample piece | |
| CN210863260U (en) | Closed sampling and returning device for flowing medium | |
| CN201176873Y (en) | Flowmeter for oil field water injection well | |
| CN203350160U (en) | permeation coefficient tester for pervious concrete | |
| CN213600659U (en) | Gas measuring instrument calibrating device and gas buffer tank thereof | |
| CN1054484A (en) | Differential pressure type vortex street mass flowmeter | |
| CN1945233A (en) | Measuring method and its device for external screw sampling of pipeline gas flow | |
| CN105258756B (en) | A kind of device and measurement method measuring irregular solid volume | |
| CN208488364U (en) | A kind of moulding hardened sand permeability test test specimen tube | |
| CN2529205Y (en) | Automatic measuring device for throttle capillary gas flow measurement | |
| CN207408161U (en) | The disposable automatic subpackaging sampler bag of hydrology-water quality | |
| CN221038584U (en) | Online particle calibration device | |
| CN218239430U (en) | Sampling device for chemical engineering inspection | |
| CN218974316U (en) | Indoor air pollutant detection equipment | |
| CN212622447U (en) | Calibrating device of environmental protection type ozone detecting instrument | |
| CN109269943A (en) | The device and method of rapid survey radon effective diffusion cofficient in the film | |
| CN211235690U (en) | A sampling device for gel purifies appearance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051116 Termination date: 20151112 |
|
| EXPY | Termination of patent right or utility model |