CN202676250U - Standard flowmeter - Google Patents
Standard flowmeter Download PDFInfo
- Publication number
- CN202676250U CN202676250U CN 201220280706 CN201220280706U CN202676250U CN 202676250 U CN202676250 U CN 202676250U CN 201220280706 CN201220280706 CN 201220280706 CN 201220280706 U CN201220280706 U CN 201220280706U CN 202676250 U CN202676250 U CN 202676250U
- Authority
- CN
- China
- Prior art keywords
- constant volume
- volume chamber
- air
- valve
- pressure
- 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.)
- Expired - Fee Related
Links
- 238000005086 pumping Methods 0.000 abstract 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 239000010720 hydraulic oil Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
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- Measuring Volume Flow (AREA)
Abstract
The utility model relates to a standard flowmeter. The standard flowmeter comprises an air inlet valve, an air inlet pipeline, a pressure gage, a pressure pipeline, a constant volume chamber, an air-pumping valve, an air-pumping pipeline, an air-exhausting plate and a flow valve, wherein the geometrical center of the air-exhausting plate is provided with a small hole, the air inlet valve is communicated with an inlet of the constant volume chamber through an air inlet pipeline, an outlet of the constant volume chamber is connected with the air-exhausting plate, the other end of the air-exhausting plate is connected with the flow valve, the pressure gage is communicated with the constant volume chamber through the pressure pipeline, and the air-pumping valve is communicated with the constant volume chamber through the air-pumping pipeline. The standard flowmeter resolves the technical problems that an existing flowmeter is poor in performance, large in size, high in cost, and not favorable for popularization and application. The structure that the constant volume chamber and the small hole measure the flow is adopted, specific air flow is provided, and the standard flowmeter is convenient to carry and can be applied to an industrial site.
Description
Technical field
The utility model belongs to field of measuring technique, relates to a kind of proving flowmeter.
Background technology
Document " design of Constant Pressure Flowmeter, " China's Space science and technology ", the 3rd phase in 1999, the 65th page～71 pages " has been introduced a kind of Constant Pressure Flowmeter.This flowmeter is comprised of pressure compensating system, measurement and control system, constant temperature system and extract system, this flowmeter does not just adopt the principle design of constant-voltage method, its core has adopted the piston actuated bellows structure especially, adopts piston actuated hydraulic oil to keep the constant normal flow that produces of transfiguration indoor gas pressure.
But this flowmeter also exists following weak point:
One, the core of this flowmeter has adopted the piston actuated bellows structure, adopt piston actuated hydraulic oil to keep the constant normal flow that produces of transfiguration indoor gas pressure, temperature variation will cause expansion or the contraction of hydraulic oil volume, and exist dead space in the grease chamber, these all can affect the performance of flowmeter;
Two, this flowmeter structure is complicated, volume weight is larger, is applicable to provide in the laboratory normal flow, and can not be used for the scene provides flow;
Three, the instrument and equipment that adopts of this flowmeter is more, and it is higher to produce cost, and the expense of operation is higher, is unfavorable for applying.
Summary of the invention
Existing flowmeter performance is poor, volume is large, cost is high in order to solve, be unfavorable for the technical matters applied, and the utility model provides a kind of proving flowmeter, overcomes the deficiency of prior art.
Technical solution of the present utility model:
A kind of proving flowmeter, its special character is: comprise air intake valve 1, admission line, pressure gauge 2, pressure pipeline, constant volume chamber 3, evacuating valve 4, pump-line, exhaustion plate and flow valve 6,
The geometric center of described exhaustion plate is provided with aperture 5, described air intake valve is communicated with by the entrance of admission line with the constant volume chamber, the outlet of described constant volume device is connected with exhaustion plate, the described exhaustion plate other end is connected with flow valve 6, described pressure gauge is communicated with by pressure pipeline and constant volume are indoor, and described evacuating valve is communicated with the constant volume chamber by pump-line.
Above-mentioned constant volume chamber volume is 1L.
Above-mentioned constant volume chamber 3 background pressure are less than 10
-3Pa.
The internal diameter of above-mentioned aperture 5 is 10 μ m, and orifice conductance is 10
-8m
3/ s.
The advantage that the utility model has:
1, the proving flowmeter that the utility model proposes has adopted the structure of constant volume chamber and aperture measuring flow, adopts this structure can realize providing the specific gas flow, and this flowmeter is easy to carry, and can be used for industry spot.
2, the utility model flowmeter has avoided temperature variation to cause expansion or the contraction of hydraulic oil volume, has avoided existing dead space.
3, the instrument and equipment that adopts of the utility model flowmeter is few, produces low cost, and the expense of operation is low, is easy to carry, and can be used for industry spot, is easy to apply.
Description of drawings
Fig. 1 is the structural representation of the utility model proving flowmeter;
Wherein, 1-air intake valve, 2-pressure gauge, 3-constant volume chamber, 4-evacuating valve, 5-aperture, 6-flow valve.
Embodiment
A kind of proving flowmeter, comprise air intake valve 1, admission line, pressure gauge 2, pressure pipeline, constant volume chamber 3, evacuating valve 4, pump-line, exhaustion plate and flow valve 6, the geometric center of exhaustion plate is provided with aperture 5, air intake valve is communicated with by the entrance of admission line with the constant volume chamber, the outlet of constant volume device is connected with exhaustion plate, the exhaustion plate other end is connected with flow valve 6, and pressure gauge is communicated with by pressure pipeline and constant volume are indoor, and evacuating valve is communicated with the constant volume chamber by pump-line.
The gaseous tension that pressure gauge is used for measurement constant volume chamber vacuum background pressure and is filled with, measurement lower limit is less than 10
-3Pa; The constant volume chamber is used for storing the gas of setting pressure, and volume is that background pressure is less than 10 about 1L
-3Pa;
Evacuating valve is opened, and is used for the constant volume chamber is vacuumized background, so that background pressure is less than 10
-3Pa is used for extracting out the unnecessary gas of constant volume chamber, the indoor gaseous tension of control constant volume, and interior leak rate is less than 10
-10Pa.m
3/ s;
Aperture is used for providing stable flow, is connected between constant volume chamber and the flow valve, and the stable performance of aperture, conductance are stablized, and the internal diameter of aperture is about 10 μ m, and orifice conductance is 10
-8m
3About/s.
Flow valve is used for providing or ending normal flow by switch, and can be connected with on-the-spot all the other devices, and interior leak rate is less than 10
-10Pa.m
3/ s.
The course of work of the present utility model is:
At first, utilize extract system that the constant volume chamber is vacuumized by evacuating valve, background is evacuated to less than 10
-3Pa.
Then, close evacuating valve, utilize gas charging system that the constant volume chamber is inflated by air intake valve, when the indoor pressure of constant volume reaches predetermined value, turn off air intake valve.If gaseous tension is too high in the constant volume chamber, then slowly open evacuating valve, unnecessary gas is extracted.
Afterwards, disconnect gas charging system and extract system.
At last, proving flowmeter is brought to the scene, open flow valve, normal flow is introduced the equipment that needs normal flow.By in the constant volume chamber, being filled with precalculated gaseous tension, thereby provide required normal pressure.
Embodiment:
A kind of proving flowmeter of the present utility model, comprise by air intake valve 1, pressure gauge 2, constant volume chamber 3, evacuating valve 4, aperture 5, flow valve 6, air intake valve 1 is connected with constant volume chamber 3 by pipeline, and be connected with gas charging system when inflation simultaneously: pressure gauge 2 is connected with constant volume chamber 3 by pipeline; Evacuating valve 4 is connected with constant volume chamber 3 by pipeline, is connected with extract system when bleeding; Aperture 5 one ends are connected with constant volume chamber 3, the other end is connected with flow valve 6.
Wherein, the volume of constant volume chamber requires to consider error for 1L that generally become 1.05L, the conductance value of aperture 5 is 2.9 * 10
-8m
3/ s.
A kind of proving flowmeter course of work of the present utility model is:
At first, utilize extract system that constant volume chamber 3 is vacuumized by evacuating valve 4, background is 8.0 * 10
-4Pa.
Then, close evacuating valve 4, utilize gas charging system that constant volume chamber 3 is inflated by air intake valve 1, the pressure in constant volume chamber 3 reaches predetermined value 2.0 * 10
-1During Pa, turn off air intake valve 1.Afterwards, disconnect gas charging system and extract system.
At last, proving flowmeter is brought to the scene, open flow valve 6, with normal flow 5.8 * 10
-9Pa.m
3/ s introduces the equipment that needs normal flow.
Claims (4)
1. proving flowmeter is characterized in that: comprise air intake valve (1), admission line, pressure gauge (2), pressure pipeline, constant volume chamber (3), evacuating valve (4), pump-line, exhaustion plate and flow valve (6),
The geometric center of described exhaustion plate is provided with aperture (5), described air intake valve is communicated with by the entrance of admission line with the constant volume chamber, the outlet of described constant volume device is connected with exhaustion plate, the described exhaustion plate other end is connected with flow valve (6), described pressure gauge is communicated with by pressure pipeline and constant volume are indoor, and described evacuating valve is communicated with the constant volume chamber by pump-line.
2. a kind of proving flowmeter according to claim 1, it is characterized in that: described constant volume chamber volume is 1L.
3. a kind of proving flowmeter according to claim 1 and 2, it is characterized in that: described constant volume chamber (3) background pressure is less than 10
-3Pa.
4. a kind of proving flowmeter according to claim 3, it is characterized in that: the internal diameter of described aperture (5) is 10 μ m, and orifice conductance is 10
-8m
3/ s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280706 CN202676250U (en) | 2012-06-14 | 2012-06-14 | Standard flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280706 CN202676250U (en) | 2012-06-14 | 2012-06-14 | Standard flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202676250U true CN202676250U (en) | 2013-01-16 |
Family
ID=47497149
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220280706 Expired - Fee Related CN202676250U (en) | 2012-06-14 | 2012-06-14 | Standard flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202676250U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267618A (en) * | 2013-05-21 | 2013-08-28 | 中国人民解放军总参谋部工程兵第四设计研究院 | Device and method for testing air tightness of protective airtight unit |
| CN103791951A (en) * | 2013-12-24 | 2014-05-14 | 兰州空间技术物理研究所 | Positive-pressure standard gas flowmeter and positive-pressure standard gas flow metering method |
| CN104236641A (en) * | 2014-09-19 | 2014-12-24 | 兰州空间技术物理研究所 | Multi-medium gas prepared sample standard flow meter based on constant-pressure method and flow providing method |
-
2012
- 2012-06-14 CN CN 201220280706 patent/CN202676250U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103267618A (en) * | 2013-05-21 | 2013-08-28 | 中国人民解放军总参谋部工程兵第四设计研究院 | Device and method for testing air tightness of protective airtight unit |
| CN103267618B (en) * | 2013-05-21 | 2015-08-19 | 中国人民解放军总参谋部工程兵第四设计研究院 | Protection airtight unit airtight performance proving installation and method of testing thereof |
| CN103791951A (en) * | 2013-12-24 | 2014-05-14 | 兰州空间技术物理研究所 | Positive-pressure standard gas flowmeter and positive-pressure standard gas flow metering method |
| CN103791951B (en) * | 2013-12-24 | 2016-09-28 | 兰州空间技术物理研究所 | Malleation calibrating gas effusion meter and malleation calibrating gas flow-measuring method |
| CN104236641A (en) * | 2014-09-19 | 2014-12-24 | 兰州空间技术物理研究所 | Multi-medium gas prepared sample standard flow meter based on constant-pressure method and flow providing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130614 |