CN85107483A - Cyclic centrifugal flowmeter - Google Patents
Cyclic centrifugal flowmeter Download PDFInfo
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- CN85107483A CN85107483A CN 85107483 CN85107483A CN85107483A CN 85107483 A CN85107483 A CN 85107483A CN 85107483 CN85107483 CN 85107483 CN 85107483 A CN85107483 A CN 85107483A CN 85107483 A CN85107483 A CN 85107483A
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Abstract
Cyclic centrifugal flowmeter is the primary instrument of flow measurement device, with the supporting measurement of differential pressure Displaying Meter flow through each class I liquid I of pressure pipeline, the instantaneous delivery of gas.Characteristics are that the flow section of water inlet pipe, annular guide channel, rising pipe etc. is rectangle or square, and section equates; Simple in structure, no internal contraction section, mechanical-less transfering device can be used for the flow measurement of dirty medium, and the pressure loss is little, and cost is low; Can be used for the flow measurement that various explosive-proof gradves require with the explosion-proof type differential pressure transmitter is supporting.
The present invention can be widely used in industrial sectors such as oil, chemical industry, metallurgy, environmental protection.
Description
The invention belongs to the measurement of fluid flow instrument
Developing rapidly of urban water supply and sewerage technology and environmental protection cause had higher requirement to flow measurement instrument, especially the ultra in the water supply engineering handled the life in the drainage system, industrial sewage processing procedure and unique sludge treatment technique.In the ultra handles, require the inner no necked-down section of flow measurement device, mechanical-less transfering device, in order to avoid foreign material and deposited material pile up or increase the resistance of transfer device at the necked-down section place, bring error to flow measurement, in special sludge treatment technique process, can produce biogas, the flow measurement of the digested sludge that contains the biogas composition is brought requirement of explosion proof.
Nineteen sixty U.S.'s report a kind of " national cyclic centrifugal flowmeter ", this flowmeter have the obstruction of being difficult for, the advantage that flow system does not change with flow or viscosity.1985, " ring tube flowmeter " of development of general petrochemical works, Yueyang, China Hunan Province terylene factory and report promptly belonged to this kind.Its structure is metal circular tube to be bent into revolve the cirele bend that turns around, and establishes 2 pressure ports on the interior outside at 180 degree places, water inlet downstream at endless tube and measures this pressure differential of 2 and obtain mean flow rate and the flow that flows through endless tube with the corresponding calculated formula again.Because the section of this flowmeter is circular, have following shortcoming: be confined on the structure bend with metal circular tube, uncontrollable cirele bend section is indeformable; The endless tube cross-sectional area that bends after the shaping can't directly accurately be measured; When fluid is flowed through the circular cross section of endless tube, have than big difference by cutting plane (the seeing Fig. 2-1) 2-2 in the center of circle and the velocity flow profile of arbitrary cutting plane 1-1, assumed condition is not exclusively identical with calculating, and the pressure increment mean value the when pressure increment of endless tube outside pressure point and real fluid flow in endless tube on this same plumb cut is variant.Therefore, bring systematic error, and limited the development and the use of ring tube flowmeter, the difficult suitability for industrialized production that realizes to flow rate calculation.
The objective of the invention is to aim to provide one simple in structure, pressure increment mean value more accords with the flow measurement instrument of flow rate calculation formula.
The flow section of cyclic centrifugal flowmeter of the present invention adopts rectangle or square, when fluid when annular guide channel moves in a circle, will produce a centrifugal force, and act on outside the guide groove, this power is fluid density, flow velocity and the function of making the circular motion bending radius.When flow section is rectangle or square (seeing Fig. 2-2), arbitrary cutting plane 1 '-1 ' with cutting plane 2 '-2 of crossing mid point ' velocity flow profile identical, the pressure increment of annular guide channel outside pressure point and the fluid pressure increment mean value that this pressure is put on the same plumb cut during actual flow state in guide groove equates, therefore, the assumed condition that more accords with the flow rate calculation formula, promptly for a certain fluid that moves in a circle in the stationary annular guide groove, its size to guide groove outside acting force is only relevant with flow velocity.By mensuration act on annular guide channel on the same vertical profile in 180 degree places in outside pressure poor, can utilize relevant formula to calculate the flow through mean flow rate of this pressure point of annular guide channel of fluid, multiply by cross-sectional area then, try to achieve flow.
Cyclic centrifugal flowmeter of the present invention because flow section is rectangle or square, is easy to machining, can strictly control physical dimension, guarantees the strict demand of major parameter such as bending radius, flow section area etc.After shaping, can directly accurately measure, thereby improve the computational accuracy of flow rate calculation formula, create condition for industrialization, producing in serial form with precision measuringtoll.In design, fluid flows into tangential direction from import, makes the smooth-going transition of fluid, does not disturb its flow state.Be provided with diaphragm between import and outlet, work the buffer action of importing and exporting fluid, play the smooth-going guide effect of fluid again, reduce the pressure loss.
Description of drawings: Fig. 1 is a cyclic centrifugal flowmeter structural map of the present invention.Fig. 2 is cyclic centrifugal flowmeter and ring tube flowmeter cutting plane velocity flow profile comparison diagram.
Structure of the present invention is seen Fig. 1, is made up of main body (1) gland (2) diaphragm (3), and main body comprises that water inlet pipe (4) annular guide channel (5) water outlet window (6) outlet pipe (7) differential pressure signal pressure port (8), (9) etc. partly form. Isolation and integral sealing that main body, cover plate and diaphragm are worked in coordination and finished inlet and outlet system. Its course of work is: fluid enters main body from water inlet pipe with the tangential direction uniform-flow, along the flow through differential pressure pressure port in downstream of annular guide channel, record because the interior outside pressure that centrifugal force produces is poor, fluid continues to flow through diaphragm along annular guide channel and flows out by water outlet window, outlet pipe. Whole technological process is carried out in main body and gland seal system.
Certainty of measurement of the present invention, technical performance, index are through the actual measurement of four model machines, and its key technical indexes for liquid is: mean flow rate is the 1-3 meter per second; Certainty of measurement is 1.5 grades (± 1.5%); The pressure loss≤flowmeter bodies length isometric, etc. two times of the round steel pipe pressure loss of area of passage; Operating pressure be 16 kgfs/centimetre2 Meter full scale is the root scale; Range ratio is 3 1/2: 1.
Measurable flow body range of flow of the present invention is at 0.5 meter3/ up to ten thousand metres3In/time, flow section is by 10 * 10 millimeters to 1000 * 1000 millimeters series of products that form.
The advantage of cyclic centrifugal flowmeter of the present invention is:
Coefficient of flow is directly obtained from the derivation of equation, does not change because of flow or viscosity change, and stability and reliability are better.
Simple in structure, no internal contraction section, mechanical-less transfering device can be used for the measurement of dirty liquid or gas flow, and the pressure loss is little, and cost is low.Supporting with the explosion-proof type differential pressure transmitter, can be used for the flow measurement that various explosive-proof gradves require.
Cyclic centrifugal flowmeter of the present invention and other annular tube type centrifugal flowmeter performance comparison see Table (1).
Embodiment:
The section of the annular guide channel of main part, water inlet pipe, rising pipe is rectangle or square, and cross dimensions equates everywhere, and cross dimensions is determined by the average design flow.Water inlet pipe, rising pipe be arranged in parallel, and the two center line is at a distance of only departing from a length of side.Pressure port is located at the 180 degree places apart from the water inlet downstream.Bottom vertical between side of diaphragm and annular guide channel fluid inlet and outlet, another side become 40～60 degree angles with the water outlet window, play the buffer action of Inlet and outlet water, and play guide functions to importing and exporting fluid.
Main body, gland and diaphragm cylinder iron or duroplasts, or nylon material is made.When working pressure≤4 kgfs/centimetre
2, during instrument bore≤25 * 25 millimeter, adopt duroplasts or nylon material better, when working pressure 〉=4 kgfs/centimetre
2, and≤16 kgfs/centimetre
2, during instrument bore 〉=50 * 50 millimeter, adopting casting pig be economy.All the flow section machining precision is
5, spraying corrosion resistant coating.
Main body is connected sealing with gland with bolt
Claims (4)
1, a kind of centrifugal flowmeter is made up of main body, gland and diaphragm.Main body comprises water inlet pipe, annular guide channel, pressure port, water outlet window, rising pipe.The flow section that it is characterized in that water inlet pipe, annular guide channel, rising pipe is rectangle or square, and communicates, and flow section equates.
2, as the described flowmeter of claim (1), it is characterized in that being provided with in the annular guide channel diaphragm, a side is settled perpendicular to guide groove bottom between fluid inlet and outlet, and opposite side becomes 40～60 degree angles with the water outlet window.
3, as the described flowmeter of claim (1), it is characterized in that cylinder iron or duroplasts, or nylon is made.
4,, it is characterized in that flow section forms series of products by 10 * 10 millimeters to 1000 * 1000 millimeters as the described flowmeter of claim (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85107483A CN85107483B (en) | 1985-10-12 | 1985-10-12 | Cyclic centrifugal flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85107483A CN85107483B (en) | 1985-10-12 | 1985-10-12 | Cyclic centrifugal flowmeter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85107483A true CN85107483A (en) | 1986-07-02 |
| CN85107483B CN85107483B (en) | 1987-03-25 |
Family
ID=4795651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85107483A Expired CN85107483B (en) | 1985-10-12 | 1985-10-12 | Cyclic centrifugal flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN85107483B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759381A (en) * | 2012-07-06 | 2012-10-31 | 中国航空工业集团公司西安飞机设计研究所 | Low flow-velocity gas pressure difference type flow measuring device |
| CN108195433A (en) * | 2018-02-09 | 2018-06-22 | 天津大学 | Walk ball flowmeter |
| CN117490783A (en) * | 2023-10-18 | 2024-02-02 | 北京东方计量测试研究所 | The lower limit is 5×10 -18 Pa·m 3 Flow meter of/s and method of use thereof |
-
1985
- 1985-10-12 CN CN85107483A patent/CN85107483B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759381A (en) * | 2012-07-06 | 2012-10-31 | 中国航空工业集团公司西安飞机设计研究所 | Low flow-velocity gas pressure difference type flow measuring device |
| CN108195433A (en) * | 2018-02-09 | 2018-06-22 | 天津大学 | Walk ball flowmeter |
| CN108195433B (en) * | 2018-02-09 | 2019-10-25 | 天津大学 | Walk ball flowmeter |
| CN117490783A (en) * | 2023-10-18 | 2024-02-02 | 北京东方计量测试研究所 | The lower limit is 5×10 -18 Pa·m 3 Flow meter of/s and method of use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN85107483B (en) | 1987-03-25 |
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