CN1236286C - Differential pressure flowmeter - Google Patents
Differential pressure flowmeter Download PDFInfo
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- CN1236286C CN1236286C CN 02150243 CN02150243A CN1236286C CN 1236286 C CN1236286 C CN 1236286C CN 02150243 CN02150243 CN 02150243 CN 02150243 A CN02150243 A CN 02150243A CN 1236286 C CN1236286 C CN 1236286C
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- differential pressure
- pressure
- detection
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Abstract
一种差压式流量计，利用重叠侧壁上设有面向流体流通方向上流侧开口的上流孔(8)的圆筒体(10)、和截面外径比所述圆筒体(10)大且侧壁上设有面向下流开口的下流孔(9)的圆筒体(11)并使其截面呈烧瓶状而构成的差压棒(3)，检测出差压。这样，即使高流速区发生涡流，其发生位置也位于远离所述圆筒体(11)的下流侧，因此可以抑制静压的变动，在较广流速区域内具有稳定的高检测精度。
A differential pressure flowmeter, using a cylindrical body (10) with an upper flow hole (8) opening on the upstream side facing the fluid flow direction on the overlapping side wall, and a cross-sectional outer diameter larger than the cylindrical body (10) And the side wall is provided with the cylinder body (11) of the downflow hole (9) facing the downflow opening, and the differential pressure rod (3) made of its section in the shape of a flask to detect the differential pressure. In this way, even if a vortex occurs in a high flow velocity region, its occurrence position is located on the downstream side away from the cylinder (11), so the fluctuation of static pressure can be suppressed, and stable and high detection accuracy can be achieved in a wide flow velocity region.
Description
Technical field
The present invention is the differential pressure flowmeter of the discharge gas cross section flow velocity of related detection flue and chimney.
Background technology
In the past, as this differential pressure flowmeter, employing be Fig. 5 and differential pressure flowmeter (for example, patent document 1,2,3) shown in Figure 6.In the differential pressure flowmeter of Fig. 5 the stagnation pressure static pressure detect with body 40 by two cross sections be semicircular body 41,42 and described two bodys 41,42 body week the side planar portions between the state that engages insert down cylindric in conjunction with forming with body 43, and have and connect described body 41 and describedly detect with hole 44 and connect described body 42 and described combination uses the static pressure detection of body 43 sidewalls to use hole 45 in conjunction with stagnation pressure with body 43 sidewalls.
Have this stagnation pressure static pressure and detect the differential pressure flowmeter of using body 40, can do following flow detection.Promptly, the stagnation pressure static pressure detects and is inserted in the pipeline (not shown) with body 40, and the circulating direction approximate vertical of himself and described fluid, and stagnation pressure detects the upstream direction opening that flows in the face of fluid with hole 44, static pressure detects the downflow direction opening that flows in the face of fluid with hole 45.Utilize the pressure detector (not shown) to detect respectively and come from the static pressure that described stagnation pressure detection is used hole 45 with the stagnation pressure and the detection of described static pressure in hole 44.Be the computing that stipulate on the basis with stagnation pressure and the static pressure that detects again, calculated flow rate.
In addition, the stagnation pressure static pressure of the differential pressure flowmeter of Fig. 6 detect with body 50 by two cross sections body 51,52 triangular in shape and the cross section of under the state that engages between the maximum planes of described two bodys 51,52, inserting be rhombus in conjunction with forming with body 53, and have and connect described body 51 and describedly detect with hole 54 and connect described body 52 and described combination uses the static pressure detection of the sidewall of body 53 to use hole 55 in conjunction with stagnation pressure with body 53 sidewalls.In this case, the also computing that can stipulate according to the stagnation pressure that detects and static pressure, calculated flow rate.
(patent documentation 1)
Te Kaiping 8-210887 communique
(patent documentation 2)
Te Kaiping 10-318810 communique
(patent documentation 3)
No. 4717459 instructions of United States Patent (USP)
The structure of differential pressure flowmeter in the past as mentioned above, as shown in Figure 5, when the stagnation pressure static pressure detects cross section with body 40 and is circle, the stagnation pressure static pressure detects the position meeting change with the pick-up point that flows on all sides of body 40, if flow rate of fluid is accelerated simultaneously, by near downstream side, producing eddy current, then the stagnation pressure static pressure detects the downstream side with body 40, be that described static pressure detects with producing unstable region on the direction of 45 openings in hole, therefore have the problem of static pressure change or pulsation.
In addition, as shown in Figure 6, when the stagnation pressure static pressure detects cross section with body 50 and is triangle, though, described pick-up point basic fixed,, rate of flow of fluid one increases, and therefore static pressure meeting change exists the accuracy of detection problem of unstable when downstream side can produce eddy current.
Summary of the invention
In view of the above problems, the object of the present invention is to provide a kind of differential pressure flowmeter that can carry out the stable flow rate detection to mensuration fluid with wider range flow velocity.
In order to achieve the above object, differential pressure flowmeter of the present invention disposes the differential pressure rod, the stagnation pressure that this differential pressure rod detect to be gone up discharge orifice by the stagnation pressure that is provided with facing fluid circulating direction upstream side opening detect with cylinder and cross section external diameter greater than described stagnation pressure detect with cylinder and be provided with towards the static pressure of dirty side opening detect with under the static pressure detection of discharge orifice constitute with cylinder, and the described stagnation pressure of overlapping joint detects with cylinder and the detection of described static pressure and uses cylinder, makes its cross sectional shape be flask shape.
The structure of differential pressure flowmeter of the present invention is as implied above, can carry out stable high-precision test in the flow velocity zone of broad.
Description of drawings
Fig. 1 is the part section outboard profile of the differential pressure flowmeter structure of the expression embodiment of the invention.
Fig. 2 is the part section outboard profile (a) and the A-A sectional view (b) thereof of differential pressure rod among the embodiment.
Fig. 3 is the fluid movement key diagram according to differential pressure flowmeter of the present invention.
Fig. 4 is the part section outboard profile of other embodiment of differential pressure flowmeter of the present invention.
Fig. 5 is the basis action specification figure of the fluid of differential pressure flowmeter in the past.
Fig. 6 is the fluid movement key diagram of basis other differential pressure flowmeters in the past.
Among the figure, 1, the 2-differential pressure flowmeter, 3-differential pressure rod, 4-pressure variator, the 5-flange, 6, the 7-catheter pressure, the last discharge orifice of 8-, discharge orifice under the 9-, 10,11-cylinder, 12-pipeline, 13-bolt, 14-opening, 15-short tube, 40-stagnation pressure static pressure detect uses body, and 41, the 42-body, 43-is in conjunction with using body, the 44-stagnation pressure detects use the hole, and the 45-static pressure detects uses the hole, 50-stagnation pressure static pressure detection body, 51, the 52-body, 53-is in conjunction with using body, and the 54-stagnation pressure detects uses the hole, and the 55-static pressure detects uses the hole.
Embodiment
Describe differential pressure flowmeter of the present invention with reference to the accompanying drawings in detail.Fig. 1 is the part section outboard profile of embodiment of the invention differential pressure flowmeter 1 structure, and Fig. 2 is the part section outboard profile (a) and the A-A sectional view (b) thereof of the differential pressure rod 3 that uses as the differential pressure detection means.
This differential pressure flowmeter 1 is by on the sidewall that is installed in pipelines 12 such as flue that detected fluid flows and chimney, and is inserted in the detected fluid, is used to detect near the differential pressure rod 3 of upflow fluid-catalyst unit pressure and downstream fluid pressure it; Reception is from the pressure signal of differential pressure rod 3 and convert thereof into the laggard professional etiquette of electric signal and decide the computing calculated flow rate, again its is shown or converts to the sensator 4 of flow signal; Be used for described differential pressure rod 3 is installed in flange 5 on the measured position of described pipeline 12; Form to the catheter pressure 6,7 of described sensator 4 pressure signal transmission of described differential pressure rod 3 with being used for.
After being provided with an end that is fixed with described differential pressure rod 3 on the described flange 5 and injecting differential pressure rod 3 in the described pipeline 12, be used for described flange 5 is fixed on the mounting hole (not shown) that the several bolts 13 on pipeline 12 sidewalls are passed through.In addition, have the opening 14 that is used to insert differential pressure rod 3 on the sidewall at the tested position of described pipeline 12.
Shown in Fig. 2 (a), described differential pressure rod 3 is made up of greater than set cylinder 11, the described catheter pressure 6 and 7 of a plurality of 9 perforation sidewalls of discharge orifices down of the downstream side opening of described cylinder 10 and facing fluid circulating direction a plurality of interior external diameters of going up set cylinder 10 of discharge orifice 8 perforation sidewalls and cross section of facing fluid circulating direction upstream side opening, and described cylinder 10,11 is gone up discharge orifice 8 and following discharge orifice 9 is distinguished outwardly and overlap in same direction with catheter pressure 6,7 with described, through soldering or solder bond, form the A-A cross section (flask shape) of Fig. 2 (b).
The multiple proportions value of the external diameter of the described cylinder 11 of the cross section external diameter of described relatively cylinder 10 can be selected according to the fluid zone of testing the speed, and still, experimental results show that roughly more effective at 1.5～2.0 o'clock.In addition, described discharge orifice 8 and the following discharge orifice 9 gone up is set respectively, passes the axially perpendicular of the rectilinear direction of central point of discharge orifice 8 and following discharge orifice 9 and cylinder 10 and cylinder 11 every identical certain intervals.
By the pressure that described cylinder 10 detects, promptly stagnation pressure is made as P
h, the pressure that is detected by cylinder 11 is that static pressure is made as P
1, differential pressure is made as Δ P (=P
h-P
1), coefficient of flow is made as K, then can set up the following formula relation between the flow Q in the pipeline 12 and these detected values and the scale-up factor.
Q＝K(P
h-P
1) (1)
Q＝K(ΔP) (2)
Described pressure variator 4 is built-in with semiconductor strain chip pressure transducer or differential pressure pick-up and microprocessor (not shown), detect the interior pressure of described cylinder 10 and 11, and when converting thereof into electric signal, carry out the computing of formula (1) or formula (2) by microprocessor, calculate flow value.The pipeline 12 that described flow coefficient k could utilize and be equipped with differential pressure rod 3 has the flux modification device (not shown) of same size pipeline, obtains by real stream test in advance, is input into microprocessor then and uses.
The order that described differential pressure rod 3 is installed on the pipeline 12 is as described below.When described pipeline 12 is installed by level, opening 14 is set in the side of the topmost at tested position.Afterwards differential pressure rod 3 is vertically inserted from described opening 14, and make the central shaft of described upward discharge orifice 8 and following discharge orifice 9 parallel, again flange 5 is fixed on the sidewall of described opening 14 peripheries with fluid flow direction.
In addition, when pipeline 12 is mounted in vertical direction, on the sidewall of pipeline 12 peripheries at tested position, opening 14 is set.Afterwards, described differential pressure rod 3 flatly inserts from opening 14, makes the central shaft of described upward discharge orifice 8 and following discharge orifice 9 parallel with flow direction, flange 5 is fixed on the sidewall of described opening 14 peripheries again.
As shown in Figure 1, the differential pressure rod 3 of described differential pressure flowmeter 1 is installed on the pipeline 12, and makes the axially vertical of differential pressure rod 3 with the flow direction of detected fluid, then shown in the direction of arrow of Fig. 3, fluid flows from the upper reaches to downflow direction along the outside of cylinder 10 and the outside of cylinder 11.At this moment, if fluid velocity is greater than 20m/sec, the downstream side of cylinder 11 then can produce eddy current, but because the cross section of differential pressure rod 3 of the present invention is a flask shape, the mobile meeting of the downstream side of differential pressure rod 3 changes, so the position that eddy current took place is positioned at the place away from cylinder 11, promptly, even the generation vortex also is not influence static pressure P
1The position produce eddy current.Like this, the affected fluid velocity of former accuracy of detection also can carry out high Precision Detection greater than the wider flow velocity district of 20m/sec.
Fig. 4 is the part section outboard profile of other example structure of differential pressure flowmeter 2 of the present invention.The described differential pressure rod 3 of this differential pressure flowmeter 2, described pressure converter 4 etc. are installed on flanged (FLGD) short tube 15 of various body sizes, under this state, can adopt the flux modification device in advance, correct flow coefficient k, and the measure-alike short tube 15 of selection and described pipeline 12, be inserted between the pipeline 12, just can use.
Differential pressure flowmeter of the present invention is characterised in that overlapping stagnation pressure is detected with cylinder and cross section external diameter than its big static pressure detection with cylinder and make its cross section be the flask shape and the differential pressure rod that forms vertically is inserted in the detected fluid, to measure its flow, but be not limited to the foregoing description, in it wants point range, can carry out all distortion.
The structure of differential pressure flowmeter of the present invention as mentioned above, even flow rate of fluid is accelerated and eddy generation, its occurrence positions was also compared apart from the position that static pressure detects far away with former differential pressure flowmeter, therefore be not vulnerable to the influence that eddy current changes, can obtain stable accuracy of detection in very wide flow velocity district.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02150243 CN1236286C (en) | 2002-11-06 | 2002-11-06 | Differential pressure flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02150243 CN1236286C (en) | 2002-11-06 | 2002-11-06 | Differential pressure flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1499178A CN1499178A (en) | 2004-05-26 |
| CN1236286C true CN1236286C (en) | 2006-01-11 |
Family
ID=34233922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02150243 Expired - Fee Related CN1236286C (en) | 2002-11-06 | 2002-11-06 | Differential pressure flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1236286C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359292C (en) * | 2006-04-18 | 2008-01-02 | 西安中望流量仪表有限公司 | Built-in conical throttling gear |
| CN102322903A (en) * | 2011-06-03 | 2012-01-18 | 徐蠡 | Pulsating flow meter with drainage tube |
-
2002
- 2002-11-06 CN CN 02150243 patent/CN1236286C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1499178A (en) | 2004-05-26 |
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Granted publication date: 20060111 Termination date: 20141106 |
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