CN200958951Y - Multi-point trapezoidal flowmeter - Google Patents
Multi-point trapezoidal flowmeter Download PDFInfo
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- CN200958951Y CN200958951Y CN 200620078689 CN200620078689U CN200958951Y CN 200958951 Y CN200958951 Y CN 200958951Y CN 200620078689 CN200620078689 CN 200620078689 CN 200620078689 U CN200620078689 U CN 200620078689U CN 200958951 Y CN200958951 Y CN 200958951Y
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Abstract
The utility model relates to a flow instrument, in particular to a trapezoid multipoint type flow instrument that can measure the flow rates of a plurality of liquids and gases. The flow instrument comprises a sensing device and a measuring device that are for the measure of the flow and is characterized in that, the sensing device (2) comprises a front pressure converge pipe (5) that is around the outer layer of the sensing device main body (1) for a cycle, a front pressure measuring pipe (6) that stretches out from the front pressure converge pipe (5) to the inside of the sensing device main body (1); wherein, the front pressure converge pipe (5) is provided with a front pressure taking nozzle (7) that is connected with the high pressure end of a measuring device (3); the front pressure measuring pipe (6) is provided with a front pressure measuring head (8) the is parallel to the flowing liquids; the end part of the front pressure measuring head (8) is provided with an opening hole (12). The requirements of the straight pipe section are very low, thus the flow instrument can be applied to the trapezoid multipoint type flow instrument of a plurality of liquid measures. Furthermore, the trapezoid multipoint type flow instrument has the advantages of large measuring dynamic state, high accuracy, also reducing the products maintenance and prolonging the application life time.
Description
Technical field
The utility model relates to a kind of flow instrument, particularly a kind of Multi-point flow counter of trapezoid that can measure various liquids and gases flows.
Background technology
Domestic and international existing differential pressure flowmeter comprises the traditional orifice plate of GB/T2624-93, nozzle, Venturi tube and import plug-in type Verabar because range of dynamic measurement is little, when high velocity fluid flow, the problem that has the poor stability of measuring flow has directly affected service precision. In addition, existing flow easily stops up when measuring dirty medium because straight length requires will reach more than the front 2.5D at least, and the pressure loss is large, makes repair density increasing etc., therefore need to measuring to some extent requirement of fluid, limit the scope of application of its flow measurement.
Summary of the invention
Goal of the invention provides a kind of Multi-point flow counter of trapezoid, and its straight length requires low, can adapt to the Multi-point flow counter of trapezoid of various fluid measurements; Another purpose of the present utility model provides a kind of dynamically large, flowmeter that precision is high of measuring, and reduces simultaneously product maintenance, increases service life.
The purpose of this utility model is to realize like this, Multi-point flow counter of trapezoid, it comprises the sensing device for measuring flow, with the measurement mechanism that is electrically connected with sensing device, it is characterized in that: sensing device 2 comprises the front remittance pressure pipe 5 around 1 an outer week of sensing device body, with converge the front pressure-measuring pipe 6 that pressure pipe 5 stretches to sensing device body 1 interior edge in the past, front pressure-tapping nozzle 7 is arranged on the front remittance pressure pipe 5, front pressure-tapping nozzle 7 is connected with the high-pressure side of measurement mechanism 3; At front pressure-measuring pipe 6 the front pressure-measuring head 8 parallel with fluid arranged; There is perforate 12 front pressure-measuring head 8 ends;
Comprise the rear remittance pressure pipe 9 around 1 an outer week of sensing device body, and pressure-measuring head 10 after the bent-tube boiler that stretch on 1 interior edge from rear remittance pressure pipe 9 to the sensing device body; After the bent-tube boiler end of pressure-measuring head 10 and fluid in the other direction at angle, there is perforate 12 end; Rear pressure-tapping nozzle 11 is arranged on the rear remittance pressure pipe 9, and rear pressure-tapping nozzle 11 is connected with measurement mechanism 3 low-pressure ends; Front pressure-measuring head 8 and rear pressure-measuring head 10 mutual dislocation in the sensing device body 1.
Described edge reaches front pressure-measuring pipe 6 in the sensing device body 1 between the 2-8 root, is arranged in parallel each other, evenly distributes.
Described edge reaches front pressure-measuring pipe 6 in the sensing device body 1 between the 4-8 root, intersects each other evenly to distribute.
The front pressure-measuring head 8 of 4-8 root is arranged on the described every front pressure-measuring pipe 6, and front pressure-measuring head 8 is arranged in parallel each other.
Described edge reaches rear pressure-measuring head 10 in the sensing device body 1 between the 4-8 root.
Perforate 12 axis of described rear pressure-measuring head 10 are vertical with flow direction.
Perforate 12 on described rear pressure-measuring head 10 calibers is between Φ 3～Φ 5, and the number of openings is between 3-5.
Pressure-measuring head perforate 12 10mm before the corner after the described bent-tube boiler.
Described sensing device body 1 is round tubular body, and there are flange 4 joints on both sides.
Described sensing device body 1 is square tubular body, and there are flange 4 joints on both sides.
Table 1 has provided the flow instrument contrast of the utility model and other model. Can find out that therefrom the utility model main feature is:
1. its fluid resistance is very little under the same conditions, makes system's operation below the about 100Pa of crushing
| The flowmeter title | Multi-point flow counter of trapezoid | The import Verabar | Orifice plate, Venturi tube |
| Model | BWY-FJ-T | BWY-series | |
| Reference to standard | Enterprise's mark | GB/T2624-93 | |
| The scope of application | DN100～6000mm | DN100～4000mm | DN50～1200mm |
| The diameter ratio | No requirement (NR) | No requirement (NR) | 0.3≤β≤0.75 |
| The pressure loss | 100Pa | ≤100Pa | 25%～50% of Δ P |
| Ways of measure pressure | Outer circular chamber | Without ring casing | Corner connection, flange, span D and D/2 |
| | 15∶1 | 10∶1 | 5∶1 |
| Precision | 0.2 | 1 | 1 grade |
| Flowmeter length form | 500(mm) | Plug-in type | Two flange thicknesses (orifice plate) |
| About caliber 5D (Venturi tube) | |||
| The straight length requirement | 0.5D behind the front 1.5D | 2.5D behind the front 4D | 5D behind the front 10D |
| Advantage | Precision is high, and the front and back straight length requires low, can measure than visceral-qi body or various liquid. (blast furnace gas, flue gas, water, oil) has outer blow device. | The pressure loss is little easy for installation | Cost is low |
| Shortcoming | Cost is high | Can not measure than visceral-qi body and liquid (as: blast furnace gas, coke-stove gas, flue gas etc.) | The permanent pressure loss is large, and range ratio is little, precision is low, easy obstruction |
| Main application | The measurement of various liquid and gas | High flow rate, Large Diameter Pipeline, clean medium | Various liquid or clean gas |
| The flow velocity requirement | 10-100m/s | 10-30m/s | 15-50m/s |
| Measuring principle | Differential pressure type, fluid all pass through measurement mechanism | Segment fluid flow passes through measurement mechanism | Fluid all passes through measurement mechanism |
| Pressure port | More than 16 | 4 | 1～4 point |
Business efficiency greatly improve, more energy-conservation more than 30% than traditional flowmeter.
2. the wide resolution ratio of range ability is high, applicable to various liquid or gas.
3. certainty of measurement is high, stable performance, and stagnation pressure, hydrostatic measuring point all are higher than the flowmeter of other form far away more than 16 points, and outer circular chamber further improves pressure stability.
4. the front and back straight length requires the short straight length that almost need not, so because multimetering requires relative reduce to straight length.
5. can pass through blow valve port H, L end field calibration (with the bernoulli equation basic principle according to take experimental data as the basis).
6. flowmeter length weak point≤500mm (no matter duct size)
7. the utility model pressure pipe adopts all steel structure and surface to be coated with non-sticking lining product is improved service life greatly.
Description of drawings
Below in conjunction with the embodiment accompanying drawing the utility model is described further.
Fig. 1 is embodiment 1 structural representation;
Fig. 2 is embodiment 2 structural representations;
Fig. 3 is the side view of embodiment 1;
Fig. 4 is the side view of embodiment 2.
Among the figure: 1, sensing device body; 2, sensing device; 3, measurement mechanism; 4, flange; 5, front remittance pressure pipe; 6, front pressure-measuring pipe; 7, front pressure-tapping nozzle; 8, front pressure-measuring head; 9, rear remittance pressure pipe; 10, rear pressure-measuring head; 11, rear pressure-tapping nozzle; 12, perforate; 13, axis; 14, flow direction; 15, blow valve port.
The specific embodiment
As shown in Figure 1, provided a kind of structure of sensing device 2, sensing device body 1 is square tubular body, and front and back are connected with fluid line by flange 4. Sensing device body 1 converges pressure pipe 5 before there is hollow in an outer week, and converges the front pressure-measuring pipe 6 that pressure pipe 5 stretches to sensing device body 1 interior edge in the past, and front pressure-measuring pipe 6 is arranged in parallel between the 2-8 root each other, evenly distributes. The front pressure-measuring head 8 of 4-8 root is arranged on the every front pressure-measuring pipe 6, and front pressure-measuring head 8 is arranged in parallel each other and flow direction 14 flows in the other direction, and there is perforate 12 front pressure-measuring head 8 ends, and the axis 13 of perforate 12 is parallel with flow direction 14. Perforate 12 is between Φ 3～Φ 5. Front pressure-tapping nozzle 7 is arranged on the front remittance pressure pipe 5, and the high-pressure side of the measurement mechanism 3 among front pressure-tapping nozzle 7 and the figure is connected. With the front remittance pressure pipe 5 parallel rear remittance pressure pipes 9 that are fixed with separated by a distance, stretch on 1 interior edge from rear remittance pressure pipe 9 to the sensing device body pressure-measuring head 10 after the bent-tube boiler; The end of pressure-measuring head 10 and fluid adopt vertical design in the other direction at angle generally speaking after the bent-tube boiler. Rear pressure-measuring head 10 is selected between the 4-8 root. Rear pressure-measuring head 10 has perforate 12, and the axis 13 of perforate 12 is vertical with flow direction 14. Perforate 12 is between Φ 3～Φ 5, and the number of openings is between 3-5. Perforate 12 10mm before the corner. Rear pressure-tapping nozzle 11 is also arranged on the rear remittance pressure pipe 9, and rear pressure-tapping nozzle 11 is connected with measurement mechanism 3 low-pressure ends among the figure; Front pressure-measuring head 8 and rear pressure-measuring head 10 mutual dislocation in the sensing device body 1.
Measurement mechanism in the utility model adopts differential pressure transmitter, such as 1151 transmitters.
Fig. 3 is its side view, as can be seen from the figure, 3 front pressure-measuring heads 8 is arranged respectively on the front pressure-measuring pipe 6 of two parallel arrangements. There is pressure-measuring head 10 behind four of the upper and lower, left and right front pressure-measuring pipe 6 both sides of two parallel arrangements.
What the embodiment of Fig. 2 was different from Fig. 1 is that it adopts square sensing device body 1. When adopting square structure, front pressure-measuring pipe 6 adopts cross-distribution, and infall communicates with front collecting pipe. Rear pressure-measuring head 10 is distributed in front pressure-measuring pipe 8 neutral positions.
Fig. 4 is the side view of Fig. 2.
Among above-mentioned two kinds of embodiment, the pressure-tapping nozzle that is connected with front and back remittance pressure pipe has same structure that one blow valve port 15 is arranged, and it communicates with the hair-dryer interface by airduct can remove the interior foreign material of pipe, makes things convenient for the maintenance of sensing device 2.
The utility model adopts in a plurality of perforates of front pressure pipe design as pressure port, measures respectively total pressure of difference on the same cross section, at rear pressure pipe perforate is arranged, and measures the static pressure on the same cross section of fluid. When different flow velocitys passes through flowmeter bodies, produce corresponding differential pressure value between total pressure and the static pressure, use the experimental data of the continuous bernoulli equation basic principle of fluid and wind tunnel laboratory, calculate by the flow of pipeline and the corresponding relation between the differential pressure, correction finally draws corresponding Mathematical Modeling through temperature and pressure. Because there are corresponding pressure ring casing and multiple spot pressure method in the outside, make institute's force value of getting more stable, accurate. Reliability and the precision of metering have greatly been improved than traditional flow instrument. The length of the utility model sensing device body is the 0.5D of caliber.
Claims (10)
1, Multi-point flow counter of trapezoid, it comprises the sensing device for measuring flow, with the measurement mechanism that is electrically connected with sensing device, it is characterized in that: sensing device (2) comprises the front remittance pressure pipe (5) around an outer week of sensing device body (1), converge pressure pipe (5) to the interior front pressure-measuring pipe (6) along stretching of sensing device body (1) with the past, front pressure-tapping nozzle (7) is arranged on the front remittance pressure pipe (5), and front pressure-tapping nozzle (7) is connected with the high-pressure side of measurement mechanism (3); At front pressure-measuring pipe (6) the front pressure-measuring head (8) parallel with fluid arranged; There is perforate (12) front pressure-measuring head (8) end;
Comprise the rear remittance pressure pipe (9) around an outer week of sensing device body (1), and in from rear remittance pressure pipe (9) to sensing device body (1) after the bent-tube boiler of stretching pressure-measuring head (10); The end of pressure-measuring head after the bent-tube boiler (10) and fluid in the other direction at angle, there is perforate (12) end; Rear pressure-tapping nozzle (11) is arranged on the rear remittance pressure pipe (9), and rear pressure-tapping nozzle (11) is connected with measurement mechanism (3) low-pressure end; Front pressure-measuring head (8) and rear pressure-measuring head (10) mutual dislocation in the sensing device body (1).
2, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: described edge reaches the interior front pressure-measuring pipe (6) of sensing device body (1) between the 2-8 root, is arranged in parallel each other, evenly distributes.
3, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: described edge reaches the interior front pressure-measuring pipe (6) of sensing device body (1) between the 4-8 root, intersects each other evenly to distribute.
4, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: the front pressure-measuring head (8) of 4-8 root is arranged on the described every front pressure-measuring pipe (6), and front pressure-measuring head (8) is arranged in parallel each other.
5, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: described edge reaches the interior rear pressure-measuring head (10) of sensing device body (1) between the 4-8 root.
6, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: perforate (12) axis of described rear pressure-measuring head (10) is vertical with flow direction.
7, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: the perforate on described rear pressure-measuring head (10) caliber is between Φ 3～Φ 5, and the number of openings is between 3-5.
8, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: pressure-measuring head perforate (12) 10mm before the corner after the described bent-tube boiler.
9, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: described sensing device body (1) is round tubular body, and there is flange (4) joint on both sides.
10, Multi-point flow counter of trapezoid according to claim 1 is characterized in that: described sensing device body (1) is square tubular body, and there is flange (4) joint on both sides.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620078689 CN200958951Y (en) | 2006-03-31 | 2006-03-31 | Multi-point trapezoidal flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620078689 CN200958951Y (en) | 2006-03-31 | 2006-03-31 | Multi-point trapezoidal flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200958951Y true CN200958951Y (en) | 2007-10-10 |
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ID=38785833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620078689 Expired - Lifetime CN200958951Y (en) | 2006-03-31 | 2006-03-31 | Multi-point trapezoidal flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200958951Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042853A (en) * | 2010-11-17 | 2011-05-04 | 西安中望流量仪表有限公司 | Internal-mounted combined type Venturi nozzle throttle mechanism |
| CN105698879A (en) * | 2016-04-08 | 2016-06-22 | 大唐彬长发电有限责任公司 | Multi-measuring point flow measurement device |
-
2006
- 2006-03-31 CN CN 200620078689 patent/CN200958951Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102042853A (en) * | 2010-11-17 | 2011-05-04 | 西安中望流量仪表有限公司 | Internal-mounted combined type Venturi nozzle throttle mechanism |
| CN102042853B (en) * | 2010-11-17 | 2012-07-11 | 西安中望流量仪表有限公司 | Internal-mounted combined type Venturi nozzle throttle mechanism |
| CN105698879A (en) * | 2016-04-08 | 2016-06-22 | 大唐彬长发电有限责任公司 | Multi-measuring point flow measurement device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20071010 |
|
| EXPY | Termination of patent right or utility model |