CN105043466A - High-online diffusing pipe double rectangular flowmeter - Google Patents
High-online diffusing pipe double rectangular flowmeter Download PDFInfo
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- CN105043466A CN105043466A CN201510491789.XA CN201510491789A CN105043466A CN 105043466 A CN105043466 A CN 105043466A CN 201510491789 A CN201510491789 A CN 201510491789A CN 105043466 A CN105043466 A CN 105043466A
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Abstract
The invention relates to a flow measuring device, in particular to a high-online diffusing pipe double rectangular flowmeter which comprises a measuring pipeline. The high-online diffusing pipe double rectangular flowmeter is characterized in that two inverted-trapezoidal throttling elements are symmetrically distributed in the measuring pipeline about a central axis, a positive pressure sampling pipe is arranged on the measuring pipeline in a matched mode, and a negative pressure sampling pipe is arranged between the inverted-trapezoidal throttling elements in a matched mode. According to the high-online diffusing pipe double rectangular flowmeter, the structure is unique, the problems that the measuring precision is low and the measuring range is narrow are solved, and the problem of the measuring precision under the low reynolds number is solved.
Description
Technical field
The present invention relates to a kind of flow measurement device, especially relate to a kind of high at linear anemostat double square flowmeter.
Background technology
In present differential-pressure instrumentation field of flow measurement, mainly contain the diffusion tubular type rectangular flow gauge applying date: 2014.06.05, open (bulletin) number: CN104017853A, application (patent right) people: Tang Linan, inventor: Tang Linan and a kind of rectangular flow gauge applying date: 2014.12.08, open (bulletin) number: CN104501884A, applicant: Shanghai Ke Yang Science and Technology Co., Ltd., inventor: all people, Wang Zhan, Lv Zhiguo, open person of outstanding talent, Li Yuanman, the flow instrument that the appearance of this two instrument is all is restricting element with inverted trapezoidal throttling element and oblong rectangular voussoir, because the pressure point of above two kinds of instrument is all in the maximum place of orifice size, the flow velocity of this local fluid is the fastest, the pressure of corresponding generation is minimum, the differential pressure value making this instrument of two kinds to get like this is larger, there is simultaneously the structure expanding and calculate shape, when making fluid flow through restricting element and inverted trapezoidal and oblong rectangular voussoir, energy stream field plays the effect of rectification, thus the undulatory property of flow is reduced.Because above-mentioned two reasons, thus make the range ratio of above two kinds of flowmeters, wider, 30:1 can be reached, but requirement such as the some places measurement range that the range ratio of 30:1 does not still reach owner wider to flow range under process conditions at the scene sometimes needs to reach more than 50:1, and when low reynolds number more than the differential pressure signal that produces of two kinds of flowmeters smaller, bring very large impact to the precision measured.
So far, the device of above-mentioned defect is not also overcome.。
Summary of the invention
The object of the invention is the defect overcoming prior art, provide a kind of structure unique, solve measuring accuracy and the narrow problem of range ability, solve low reynolds number under the one of problem of measuring accuracy high at linear anemostat double square flowmeter.
The present invention realizes in the following way:
A kind of high at linear anemostat double square flowmeter, it comprises measuring channel, it is characterized in that: with distribution two inverted trapezoidal throttling elements of axis symmetry in measuring channel pipeline, positive pressure pipe is engaged on described measuring channel, negative pressure pipe is engaged between described two inverted trapezoidal throttling elements;
Described inverted trapezoidal throttling element shape of cross section is the scarce type of circle, and front projection is up big and down small inverted trapezoidal;
Described trapezoidal throttling element front portion is angle α reducer, rear portion is angle β expansion segment, α and β is respectively 135 °, 165 °, and the vertical range H between contraction section is 0.6D, and contraction section horizontal range L1 is 1D, and D is the diameter of described measuring channel;
Described negative pressure pipe is engaged in the throat center of described trapezoidal throttling element, and described positive pressure pipe and negative pressure pipe respectively have one up and down;
The internal diameter of the distance F of described positive and negative pressure port to be 0.3D, D be described measuring channel;
The anterior angle α reducer of the described throttling element in inverted trapezoidal and angle, rear portion β expansion segment are all provided with breeze way.
The present invention has following effect:
1) structure unique, violent eddy current can not be produced when making medium flow through inverted trapezoidal throttling element like this, thus the precision and stability that guarantee is measured: the present invention determines experimental study discovery when the fluid in flow field flows through height at linear anemostat double square flowmeter by real failing to be sold at auction, a pressure differential is produced before and after it, there is certain funtcional relationship in this pressure differential and flow, by pressure port, the differential pressure signal that height produces at linear anemostat double square flowmeter in flow field is detected, be then converted into the flow in practical flow field by funtcional relationship, in the pipeline of circular and square pipeline, with distribution two inverted trapezoidal throttling elements of axis symmetry, described inverted trapezoidal throttling element shape of cross section is the scarce type of circle, front projection is up big and down small inverted trapezoidal, trapezoidal two each angle α, β is respectively 135 °, 165 °, vertical range H between contraction section is 0.6D, D is the internal diameter of described measuring channel, contraction section horizontal range L1 is 1D respectively has a sampling below atmospheric pressure hole inverted trapezoidal up and down restricting element at its throat center, the restricting element of these two inverted trapezoidals will make the circulation area of circular pipe reduce, thus the velocity of medium flowing through contraction section is accelerated, thus pressure is become smaller.There is certain size length at the anterior angle α reducer of the throttling element of inverted trapezoidal and angle, rear portion β expansion segment, violent eddy current can not be produced when making medium flow through inverted trapezoidal throttling element like this, thus ensure the precision and stability of measurement.
2) pressure be ultimately delivered on display instrument can be stablized: the present invention is in the mode of pressure, we adopt the ways of measure pressure of grading ring, by positive pressure port, circular pipeline is adopted to connect, and then this circle pipeline on open pressure port, the distance F of positive and negative pressure port be the such ways of measure pressure of 0.3D pressure port can be made to take out pressure under the effect of grading ring can equilibrium once, the pressure be ultimately delivered on display instrument can be stablized.
3) solve the measuring accuracy of low reynolds number and the narrow problem of range ratio, making the measuring accuracy under low reynolds number reach 0.5% becomes possibility, also makes the range ability under low reynolds number rise to 50:1 from 30:1.
Accompanying drawing explanation
Fig. 1 is embodiments of the invention one structural representations;
Fig. 2 is the cut-open view of Fig. 1 of the present invention along A-A;
Fig. 3 is embodiments of the invention two structural representations;
Fig. 4 is the cut-open view of Fig. 3 of the present invention along A-A.
Embodiment
Embodiment one: a kind of high at linear anemostat double square flowmeter, it comprises measuring channel 5, as illustrated in fig. 1 and 2: with distribution two inverted trapezoidal throttling elements 6 of axis symmetry in measuring channel 5 pipeline, positive pressure pipe 1 is engaged on described measuring channel 5, and negative pressure pipe 2 is engaged between described two inverted trapezoidal throttling elements 6.
Described inverted trapezoidal throttling element 6 shape of cross section is the scarce type of circle, and front projection is up big and down small inverted trapezoidal.
Described trapezoidal throttling element front portion is angle α reducer, rear portion is angle β expansion segment, α and β is respectively 135 °, 165 °, and the vertical range H between contraction section is 0.6D, and contraction section horizontal range L1 is 1D, and D is the diameter of described measuring channel 5.
Described negative pressure pipe 2 is engaged in the throat center of described trapezoidal throttling element 6, and described positive pressure pipe respectively has one up and down, and the above is 1, and here is 3; Negative pressure pipe respectively has one up and down, and the above is 2, and here is 4.
The diameter of the distance F of described positive and negative pressure port to be 0.3D, D be described measuring channel 1.
The anterior angle α reducer of the described throttling element in inverted trapezoidal and angle, rear portion β expansion segment are all provided with breeze way.
Above-mentioned measuring channel 1 is circular.
Embodiment two: a kind of high at linear anemostat double square flowmeter, it comprises measuring channel 5, as shown in Figures 3 and 4: with distribution two inverted trapezoidal throttling elements 6 of axis symmetry in measuring channel 1 pipeline, positive pressure pipe 1 is engaged on described measuring channel 5, and negative pressure pipe 2 is engaged between described two inverted trapezoidal throttling elements 6.
Described inverted trapezoidal throttling element 6 shape of cross section is the scarce type of circle, and front projection is up big and down small inverted trapezoidal.
Described trapezoidal throttling element front portion is angle α reducer, rear portion is angle β expansion segment, α and β is respectively 135 °, 165 °, and the vertical range H between contraction section is 0.6D, and contraction section horizontal range L1 is 1D, and D is the diameter of described measuring channel 1.
Described negative pressure pipe 2 is engaged in the throat center of described trapezoidal throttling element 6, and described negative pressure pipe 2 is engaged in the throat center of described trapezoidal throttling element 6, and described positive pressure pipe respectively has one up and down, and the above is 1, and here is 3; Negative pressure pipe respectively has one up and down, and the above is 2, and here is 4.
The diameter of the distance F of described positive and negative pressure port to be 0.3D, D be described measuring channel 1.
The anterior angle α reducer of the described throttling element in inverted trapezoidal and angle, rear portion β expansion segment are all provided with breeze way.
Above-mentioned measuring channel 1 is square.
Claims (6)
1. one kind high at linear anemostat double square flowmeter, it comprises measuring channel (5), it is characterized in that: with distribution two inverted trapezoidal throttling elements (6) of axis symmetry in measuring channel (5) pipeline, positive pressure pipe (1) is engaged on described measuring channel (5), and negative pressure pipe (2) is engaged between described two inverted trapezoidal throttling elements (6).
2. as claimed in claim 1 a kind of high at linear anemostat double square flowmeter, it is characterized in that: described inverted trapezoidal throttling element (6) shape of cross section is the scarce type of circle, and front projection is up big and down small inverted trapezoidal.
3. as claimed in claim 2 a kind of high at linear anemostat double square flowmeter, it is characterized in that: described trapezoidal throttling element front portion is angle α reducer, rear portion is angle β expansion segment, α and β is respectively 135 °, 165 °, vertical range H between contraction section is 0.6D, the diameter of contraction section horizontal range L1 to be 1D, D be described measuring channel (1).
4. as claimed in claim 1 or 2 a kind of high at linear anemostat double square flowmeter, it is characterized in that: described negative pressure pipe (2) is engaged in the throat center of described trapezoidal throttling element (6), described positive pressure pipe (1) and negative pressure pipe (2) respectively have one up and down.
5. as claimed in claim 1 a kind of high at linear anemostat double square flowmeter, it is characterized in that: the diameter of the distance F of described positive and negative pressure port to be 0.3D, D be described measuring channel (1).
6. as claimed in claim 1 or 2 a kind of high at linear anemostat double square flowmeter, it is characterized in that: the anterior angle α reducer of the described throttling element in inverted trapezoidal and angle, rear portion β expansion segment are all provided with breeze way.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510491789.XA CN105043466A (en) | 2015-08-12 | 2015-08-12 | High-online diffusing pipe double rectangular flowmeter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510491789.XA CN105043466A (en) | 2015-08-12 | 2015-08-12 | High-online diffusing pipe double rectangular flowmeter |
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| CN105043466A true CN105043466A (en) | 2015-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510491789.XA Pending CN105043466A (en) | 2015-08-12 | 2015-08-12 | High-online diffusing pipe double rectangular flowmeter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764344A (en) * | 2016-08-16 | 2018-03-06 | 王子平 | For measuring the rectangle flowmeter of gas flow |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1343576A (en) * | 1971-05-19 | 1974-01-10 | Gen Signal Corp | Differential pressure fluid flow metering device |
| CN103791953A (en) * | 2013-05-28 | 2014-05-14 | 苍南自动化仪表厂 | High-precision integrated nuclear Venturi tube |
| CN104019853A (en) * | 2014-06-05 | 2014-09-03 | 唐力南 | Diffusion tube type rectangular flow meter |
| CN204241043U (en) * | 2014-12-05 | 2015-04-01 | 浦瑞斯仪表（上海）有限公司 | Rectangle differential pressure flowmeter |
| CN104501884A (en) * | 2014-12-08 | 2015-04-08 | 上海科洋科技股份有限公司 | Rectangular flowmeter |
| CN204944560U (en) * | 2015-08-12 | 2016-01-06 | 银川融神威自动化仪表厂(有限公司) | A kind of high at linear anemostat double square flowmeter |
-
2015
- 2015-08-12 CN CN201510491789.XA patent/CN105043466A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1343576A (en) * | 1971-05-19 | 1974-01-10 | Gen Signal Corp | Differential pressure fluid flow metering device |
| CN103791953A (en) * | 2013-05-28 | 2014-05-14 | 苍南自动化仪表厂 | High-precision integrated nuclear Venturi tube |
| CN104019853A (en) * | 2014-06-05 | 2014-09-03 | 唐力南 | Diffusion tube type rectangular flow meter |
| CN204241043U (en) * | 2014-12-05 | 2015-04-01 | 浦瑞斯仪表（上海）有限公司 | Rectangle differential pressure flowmeter |
| CN104501884A (en) * | 2014-12-08 | 2015-04-08 | 上海科洋科技股份有限公司 | Rectangular flowmeter |
| CN204944560U (en) * | 2015-08-12 | 2016-01-06 | 银川融神威自动化仪表厂(有限公司) | A kind of high at linear anemostat double square flowmeter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107764344A (en) * | 2016-08-16 | 2018-03-06 | 王子平 | For measuring the rectangle flowmeter of gas flow |
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Application publication date: 20151111 |