CN2095404U - Small volume flowmeter - Google Patents
Small volume flowmeter Download PDFInfo
- Publication number
- CN2095404U CN2095404U CN 91207838 CN91207838U CN2095404U CN 2095404 U CN2095404 U CN 2095404U CN 91207838 CN91207838 CN 91207838 CN 91207838 U CN91207838 U CN 91207838U CN 2095404 U CN2095404 U CN 2095404U
- Authority
- CN
- China
- Prior art keywords
- flowmeter
- metering
- pressure sensing
- small flow
- sensing holes
- 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.)
- Withdrawn
Links
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The utility model relates to a flowmeter for metering small flow of fluid, which is composed of a throttling device and a pressure difference metering device. The utility model is characterized in that the throttling device of pressure difference, which is suitable for metering, is an annular section pipe, the inside section of which forms a concentric circular ring shaped gap; two pressure sensing holes are respectively arranged in the position of a distance at the inner side of both ends of the annular section pipe; contraction, diffusion, and other factors which lead to local loss do not exist between the two pressure sensing holes, and thereby, high precision metering and favorable linear relation between flow rate and pressure difference are ensured. The utility model has the advantages of simple structure and high metering precision, which not only is used for high precision metering for small flow of fluid in industrial production, but also is used as a standard flowmeter.
Description
The utility model belongs to fluid low discharge field of measuring technique.
When flowmeter commonly used is used for the measurement of fluid low discharge, the not high shortcoming of precision is arranged all.In order to overcome this shortcoming, some flowmeter for small flow schemes have been proposed.River Tian Yulang etc. writes, the 250th page of metering publishing house nineteen eighty-two " the flow measurement handbook " published the above laminar flow flowmeter, its restricting element is the pipe that the little ball of solid is filled in an inside, and two pressure sensing holes are located at respectively and are filled not the filling on the bulb section of the ball pipe outside.The disclosed micro-flowmeter of Chinese invention patent CN85102829A, its restricting element in order to the pressure reduction that formation is suitable for measuring is made by microparticle laminate or foam layer plate, and two pressure sensing holes are located at respectively on the laminate pipelines on two sides.Above-mentioned two kinds of flowmeters are than flowmeter commonly used, precision in low discharge is measured truly has tangible raising, but its shortcoming is: (1) fluid has contraction and diffusion phenomena to take place in the process that is flowed to low pressure pressure sensing hole section by high pressure pressure sensing hole section, and local losses correspondingly will influence linear relationship and the measuring accuracy between flow and the pressure reduction; (2) the unavoidable a small amount of suspension that exists may form the locality obstruction to restricting element in the detected fluid (particularly liquid), thereby influences the stability and the precision of measurement result.
The purpose of this utility model promptly is to overcome the shortcoming of the above-mentioned type flowmeter for small flow.
Above-mentioned purpose of the present utility model is to realize by the improvement to restriction device.As shown in the figure, the restriction device of the pressure reduction that is suitable for measuring in order to formation in the utility model is the annular section pipeline that a flow section is concentric circles annular slit.Two pressure sensing holes are located at the inboard segment distance place of annular section pipe ends respectively, flow in the process of low pressure pressure sensing hole place section by high pressure pressure sensing hole place section at fluid, do not shrink and the diffusion phenomena generation, thereby guaranteed that the good linear between flow and the pressure reduction concerns and measuring accuracy.Because the yardstick of annulus is obviously greater than the yardstick that fills the hole of ball pipe and laminate in above-mentioned two kinds of flowmeters, thus can not stopped up by a small amount of suspension in the detected fluid, thus guaranteed the stability of measurement result.The interior external diameter of annulus and the distance between two pressure sensing holes are according to the size of detected fluid coefficient of viscosity and flowmeter range and selected.For the measurement of pressure reduction, can select various high precision differential pressure measurement device as required for use.
The utility model is simple in structure, is convenient to processing.Experimental result shows to have good linear relationship between flow and the pressure reduction, and measurement result is reliable and stable, and precision is better than existing similar technology, can be used for the high-acruracy survey of fluid low discharge in the commercial production, also can be used as proving flowmeter.
Fig. 1 is restriction device principles of construction figure, and Fig. 2 is its sectional view along the E-E section, and wherein the A end is for flowing into end, and the B end is outflow end, and 1 is body, and 2 is central cylinder, and 3 is high pressure pressure sensing hole fairlead, and 4 is low pressure pressure sensing hole fairlead, and 5 is rest pad.
The inventor once finished following embodiment: annulus interior diameter (being the diameter of central cylinder 2) is 4.6mm, annulus overall diameter (being the interior diameter of body 1) is 6mm, two pressure sensing hole centre distance are 150mm, detected fluid is No. 30 machine oil, range is 0～20ml/min, used differential pressure measurement device is an inversion U-shaped pipe differential manometer, and the resolution of its liquid-column height is 0.1mm.Test findings shows in whole range ability, to have good linear relationship between flow and the pressure reduction, and measuring accuracy is better than 0.2%, and measurement result is reliable and stable.
Claims (3)
1, a kind of flowmeter for small flow of being made up of restriction device and differential pressure measurement device is characterized in that its restriction device is that a flow section is concentric circles annular slit, which is provided with the annular section pipeline of two pressure sensing holes.
2, according to the described flowmeter for small flow of claim 1, it is characterized in that described two pressure sensing holes are located at the inboard segment distance place of described annular section pipe ends respectively, there not be the factor of formation local losses such as contraction, diffusion therebetween.
3,, it is characterized in that the inner and outer diameter of described annulus and the distance between two pressure sensing holes are according to the size of fluid viscosity coefficient and flowmeter range and selected according to the described flowmeter for small flow of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91207838 CN2095404U (en) | 1991-05-08 | 1991-05-08 | Small volume flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91207838 CN2095404U (en) | 1991-05-08 | 1991-05-08 | Small volume flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2095404U true CN2095404U (en) | 1992-02-05 |
Family
ID=50158320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91207838 Withdrawn CN2095404U (en) | 1991-05-08 | 1991-05-08 | Small volume flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2095404U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323287C (en) * | 2004-11-10 | 2007-06-27 | 中国科学院长春光学精密机械与物理研究所 | Flexible plate wave differential pressure type micro flow transducer and fabricating method thereof |
| CN107101688A (en) * | 2017-04-21 | 2017-08-29 | 合肥江航飞机装备有限公司 | A kind of laminar-type gas flowmeter and scaling method |
| CN107144311A (en) * | 2017-04-21 | 2017-09-08 | 合肥江航飞机装备有限公司 | A kind of small-flow gas flowmeter and scaling method |
| CN111896059A (en) * | 2020-07-02 | 2020-11-06 | 南京航空航天大学 | Differential pressure self-adaptation measurement section of differential pressure type flowmeter |
-
1991
- 1991-05-08 CN CN 91207838 patent/CN2095404U/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1323287C (en) * | 2004-11-10 | 2007-06-27 | 中国科学院长春光学精密机械与物理研究所 | Flexible plate wave differential pressure type micro flow transducer and fabricating method thereof |
| CN107101688A (en) * | 2017-04-21 | 2017-08-29 | 合肥江航飞机装备有限公司 | A kind of laminar-type gas flowmeter and scaling method |
| CN107144311A (en) * | 2017-04-21 | 2017-09-08 | 合肥江航飞机装备有限公司 | A kind of small-flow gas flowmeter and scaling method |
| CN107144311B (en) * | 2017-04-21 | 2020-04-07 | 合肥江航飞机装备有限公司 | Small-flow gas flowmeter and calibration method |
| CN107101688B (en) * | 2017-04-21 | 2020-04-07 | 合肥江航飞机装备有限公司 | Laminar flow type gas flowmeter and calibration method |
| CN111896059A (en) * | 2020-07-02 | 2020-11-06 | 南京航空航天大学 | Differential pressure self-adaptation measurement section of differential pressure type flowmeter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3349619A (en) | Laminar flow element and flow meter | |
| US3678754A (en) | Flow measuring device | |
| GB2177803A (en) | Flowmeter | |
| CN1979098A (en) | Flow meter with built in micro differential pressure sensor | |
| US2306940A (en) | Flow meter | |
| CN2095404U (en) | Small volume flowmeter | |
| US3979955A (en) | Flowmeter | |
| CN214502553U (en) | Orifice flowmeter | |
| DE69902377D1 (en) | FLOWMETERS | |
| CN101349581B (en) | Insert type flow measuring device based on MEMS sensor | |
| CN113091838A (en) | Orifice flowmeter | |
| CN201262559Y (en) | Plug-in flow measuring device based on MEMS sensor | |
| CN207132924U (en) | A kind of glass rotameter | |
| CN109443458A (en) | A kind of concave arc shape double fluid is to mean velocity tube flowmeter | |
| CN207081512U (en) | A kind of waterpipe type pressure sensor | |
| CN210321847U (en) | Venturi flow meter | |
| CN208350559U (en) | A kind of device by the quiet shear stress of pipeline fluid measured | |
| US3789664A (en) | Fluid flow range indicating apparatus | |
| CN208398948U (en) | It is a kind of for measuring the throttling set pressure vessel of flux of moisture | |
| CN2627466Y (en) | Kinetic pressure down-hole flow sensor | |
| US2020588A (en) | Fluid flow meter | |
| CN219757411U (en) | Flow detection device based on differential pressure measurement principle | |
| CN202869554U (en) | Balancing flowmeter | |
| CN217504869U (en) | Pressure-relief wedge-shaped flowmeter | |
| CN2166420Y (en) | Flow sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |