CN111964736A - Venturi flow meter - Google Patents
Venturi flow meter Download PDFInfo
- Publication number
- CN111964736A CN111964736A CN202010972539.9A CN202010972539A CN111964736A CN 111964736 A CN111964736 A CN 111964736A CN 202010972539 A CN202010972539 A CN 202010972539A CN 111964736 A CN111964736 A CN 111964736A
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- CN
- China
- Prior art keywords
- cylindrical section
- section
- throat
- inlet
- pipe body
- 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.)
- Pending
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/36—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure the pressure or differential pressure being created by the use of flow constriction
- G01F1/40—Details of construction of the flow constriction devices
- G01F1/44—Venturi tubes
Abstract
The invention provides a venturi flowmeter, which is characterized in that: the pressure measuring device comprises a pipe body provided with a pressure measuring port, wherein a front flange and a rear flange are respectively arranged at two ends of the pipe body; the pipe body comprises an inlet cylindrical section, a contraction section, throat cylindrical sections and an expansion section, pressure taking ports are respectively arranged on the throat cylindrical section and the inlet cylindrical section, and a differential pressure sensor is arranged between the pressure taking ports of the two throat cylindrical sections and the inlet cylindrical section; and a flow stabilizing assembly is arranged on the inner wall of the contraction section. The pipe body flow stabilizer is reasonable in structural design, stable flow of all parts in the pipe body can be guaranteed to the maximum extent by means of the flow stabilizer, turbulence and irregular impact are avoided, the pipe body flow stabilizer is used for a long time, impact and abrasion of impurities in a medium on the contraction section and the hose clamp cylinder section are small, the requirements of petroleum and chemical field environments on flow measurement can be well met, the flow stabilizer assembly guarantees that the medium of the contraction part of the inner wall of the pipe body is stable, and a foundation is laid for accuracy of a flow measurement structure.
Description
Technical Field
The invention belongs to the technical field of oil exploitation equipment, and particularly relates to a venturi flowmeter.
Background
The flowmeter serving as a pipeline flow measuring instrument can be applied to different media, but in the field of petroleum production, the water quality injected into a water injection well contains oil, impurities are more, the flowmeter is easy to block by an oil extraction turbine type or vortex street type flowmeter, the flowmeter error is large or the flowmeter cannot be normally measured, and the electromagnetic flowmeter can avoid blocking, but is high in price, harsh in requirement on the thickness of a pipeline wall, high in power consumption and not suitable for a battery power supply system. In addition, the accuracy of flow measurement is affected by the medium running state, if the pipe is in a turbulent condition, the measurement result is easy to have a large error, and even if parameters such as flow velocity, pressure and the like in a local range are changed or unbalance exists, the accuracy of the measurement structure is also affected, so that the existing flowmeter product cannot well meet the use requirement and needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a venturi flow meter.
In order to solve the technical problems, the technical scheme created by the invention is realized as follows:
a Venturi flowmeter comprises a pipe body provided with a pressure taking port, wherein a front flange and a rear flange are respectively arranged at two ends of the pipe body; the pipe body comprises an inlet cylindrical section, a contraction section, throat cylindrical sections and an expansion section, pressure taking ports are respectively arranged on the throat cylindrical section and the inlet cylindrical section, and a differential pressure sensor is arranged between the pressure taking ports of the two throat cylindrical sections and the inlet cylindrical section; and a flow stabilizing assembly is arranged on the inner wall of the contraction section.
Further, the inlet cylindrical section length is greater than the inlet cylindrical section diameter.
Further, the diameter of the inlet cylindrical section is 2-2.5 times of that of the throat cylindrical section.
Further, the length of the throat cylinder section is greater than 1/3 the diameter of the throat cylinder section and less than the diameter of the inlet cylinder section.
Furthermore, the taper angle of the flaring section is 7-15 degrees.
Furthermore, the diameter of the pressure taking opening on the throat cylindrical section is 0.1-0.13 times of the diameter of the throat cylindrical section.
Further, the diameter of the pressure taking opening on the inlet cylindrical section is larger than 0.1 time of the diameter of the throat cylindrical section and smaller than 0.1 time of the diameter of the inlet cylindrical section.
Furthermore, the flow stabilizing assembly comprises flow stabilizing plates which are arranged along the axial direction of the pipe body at intervals, each flow stabilizing plate is fixed on the inner wall of the contraction section according to the situation, the thickness of each flow stabilizing plate is gradually reduced from the inlet cylindrical section to the throat cylindrical section, and the thickness of the root of each flow stabilizing plate is larger than that of the outer end part of each flow stabilizing plate.
Further, the flow stabilizing plate has a transition section extending towards the inlet cylindrical section, and the thickness of the transition section is gradually reduced from the throat cylindrical section to the inlet cylindrical section.
Further, an upstream pressure sensor is also mounted to the inlet cylinder section.
The invention has the advantages and positive effects that:
the pipe body flow stabilizer is reasonable in structural design, stable flow of all parts in the pipe body can be guaranteed to the maximum extent by means of the flow stabilizer, turbulence and irregular impact are avoided, the pipe body flow stabilizer is used for a long time, impact and abrasion of impurities in a medium on the contraction section and the hose clamp cylinder section are small, the requirements of petroleum and chemical field environments on flow measurement can be well met, the flow stabilizer assembly guarantees that the medium of the contraction part of the inner wall of the pipe body is stable, and a foundation is laid for accuracy of a flow measurement structure.
Drawings
FIG. 1 is a schematic structural diagram of the invention;
fig. 2 is a schematic view of a tubular body according to an embodiment of the present invention.
In the figure: 1-a pipe body; 2-a differential pressure sensor; 3-front flange; 4-rear flange; 5-an inlet cylinder section; 6-a contraction section; 7-throat cylinder section; 8-flaring section; 9-a flow stabilizer; 10-a transition section; 11-an upstream pressure sensor; 12-a temperature sensor; 13-a pressure guiding pipe; 14-pressure taking port.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.
In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.
The following detailed description of the embodiments of the invention is provided.
A Venturi flowmeter, as shown in figures 1 and 2, comprises a pipe body 1 provided with a pressure taking port 14, wherein a front flange 3 and a rear flange 4 are respectively arranged at two ends of the pipe body; the pipe body comprises an inlet cylindrical section 5, a contraction section 6, a throat cylindrical section 7 and an expansion section 8, pressure taking ports are respectively arranged on the throat cylindrical section and the inlet cylindrical section, and a pressure difference sensor 2 is arranged between the two throat cylindrical sections and the pressure taking ports of the inlet cylindrical section through a pressure guiding pipe 13; and a flow stabilizing assembly is arranged on the inner wall of the contraction section. Typically, the inlet cylinder segment length (value) is greater than the inlet cylinder segment diameter (value).
In order to prevent the pipeline from being blocked, the flowmeter achieves better use effect, and the diameter of the inlet cylindrical section is 2-2.5 times of that of the throat cylindrical section. The length of the throat cylindrical section is greater than 1/3 the diameter of the throat cylindrical section and less than the diameter of the inlet cylindrical section. And the taper angle of the flaring section is 7-15 degrees. Each part structure has realized more reasonable matching through the design of specific angle and length, avoids the condition that the medium flow inequality or flow suddenly change to appear in the body, can not appear above-mentioned problem even in local range.
For the purpose of calculating the flow rate, an upstream pressure sensor 11 may also be installed in the inlet cylinder section. In addition, a temperature sensor 12 can be further installed on the inlet cylinder section, for example, solar energy can be converted into electric energy by using a solar panel to supply power to the upstream pressure sensor and the differential pressure sensor, and therefore the inconvenience of commercial power wiring is reduced.
In an alternative embodiment, the diameter of the pressure tapping on the throat cylinder section is 0.1-0.13 times the diameter of the throat cylinder section. The diameter of the pressure taking opening on the inlet cylindrical section is 0.1 time larger than that of the throat cylindrical section and is 0.1 time smaller than that of the inlet cylindrical section.
The flow stabilizing assembly comprises flow stabilizing plates 9 which are arranged in the contraction section at intervals along the axial direction of the pipe body, a medium channel is formed by a gap between every two adjacent flow stabilizing plates, each flow stabilizing plate is fixed on the inner wall of the contraction section according to the situation, the thickness of each flow stabilizing plate is gradually reduced from the inlet cylindrical section to the throat cylindrical section, and the thickness of the root of each flow stabilizing plate is larger than that of the outer end part.
In an alternative embodiment, the flow stabilizing plate has a transition section 10 extending towards the inlet cylindrical section, the thickness of the transition section is gradually reduced from the throat cylindrical section to the inlet cylindrical section, so that the medium entering the contraction section can not impact the flow stabilizing plate, when the medium flows through each medium channel, the mutual influence is small, the medium entering the throat cylindrical section through the contraction section has good stability and no turbulence, the accuracy of a differential pressure flow measurement structure is ensured, and the accuracy of flow measurement is ensured.
The working principle is as follows: the venturi flowmeter is installed in a pipeline filled with liquid, a static pressure difference is generated between the upstream side of the venturi and the throat part, and the flow is measured accurately according to GB/T2624.3 according to the measured value of the pressure difference, the characteristics of the fluid and the using environment.
The input parameters calculated are:
the diameter D (m) of the pipe; throat diameter d (m); measuring the temperature t (. degree. C.); upstream static pressure p1 (MPa); the upstream and downstream pressure difference Δ p (MPa).
By way of example, the calculation process may be:
according to the water temperature and water pressure at the upstream of the pipeline, a hydrodynamic viscosity meter is manually checked, and the dynamic viscosity mu 1 of the water at the corresponding temperature and pressure is calculated by using an arithmetic method of equal difference.
Calculating the fluid density ρ:
ρ 0.0000000004 × water temperature t5-0.0000006 × water temperature t4+0.00006 × water temperature t3-0.0081 × water temperature t2+0.0605 × water temperature t +999.825
Calculate hypothetical flow qvj (m 3/h):
qvjnot equal to 0.0335 × (pressure difference Δ p × 1000000)0.5049
Calculating Reynolds number Red of water flow of the throat part of the Venturi tube:
the pipe body flow stabilizer is reasonable in structural design, stable flow of all parts in the pipe body can be guaranteed to the maximum extent by means of the flow stabilizer, turbulence and irregular impact are avoided, the pipe body flow stabilizer is used for a long time, impact and abrasion of impurities in a medium on the contraction section and the hose clamp cylinder section are small, the requirements of petroleum and chemical field environments on flow measurement can be well met, the flow stabilizer assembly guarantees that the medium of the contraction part of the inner wall of the pipe body is stable, and a foundation is laid for accuracy of a flow measurement structure.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be embodied in other specific forms without departing from the spirit or essential characteristics thereof.
The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A venturi flow meter, characterized by: comprises a tube body provided with a pressure taking port;
a front flange and a rear flange are respectively arranged at two ends of the pipe body;
the pipe body comprises an inlet cylindrical section, a contraction section, throat cylindrical sections and an expansion section, pressure taking ports are respectively arranged on the throat cylindrical section and the inlet cylindrical section, and a differential pressure sensor is arranged between the pressure taking ports of the two throat cylindrical sections and the inlet cylindrical section;
and a flow stabilizing assembly is arranged on the inner wall of the contraction section.
2. The venturi flow meter of claim 1, wherein: the inlet cylindrical section has a length greater than the diameter of the inlet cylindrical section.
3. The venturi flow meter of claim 1, wherein: the diameter of the inlet cylindrical section is 2-2.5 times of that of the throat cylindrical section.
4. A venturi meter according to claim 1 or 3, wherein: the length of the throat cylindrical section is greater than 1/3 the diameter of the throat cylindrical section and less than the diameter of the inlet cylindrical section.
5. The venturi flow meter of claim 1, wherein: the taper angle of the flaring section is 7-15 degrees.
6. The venturi flow meter of claim 1, wherein: the diameter of the pressure taking opening on the throat cylindrical section is 0.1-0.13 times of the diameter of the throat cylindrical section.
7. A venturi meter according to claim 1 or 6, characterized in that: the diameter of the pressure taking opening on the inlet cylindrical section is 0.1 time larger than that of the throat cylindrical section and 0.1 time smaller than that of the inlet cylindrical section.
8. The venturi flow meter of claim 1, wherein: the flow stabilizing assembly comprises flow stabilizing plates which are arranged at intervals along the axial direction of the pipe body, each flow stabilizing plate is fixed on the inner wall of the contraction section according to the situation, the thickness of each flow stabilizing plate is gradually reduced from the inlet cylindrical section to the throat cylindrical section, and the thickness of the root of each flow stabilizing plate is larger than that of the outer end part of each flow stabilizing plate.
9. The venturi flow meter of claim 8, wherein: the flow stabilizing plate is provided with a transition section extending towards the inlet cylindrical section, and the thickness of the transition section is gradually reduced from the throat cylindrical section to the inlet cylindrical section.
10. The venturi flow meter of claim 1, wherein: the inlet cylinder section is also fitted with an upstream pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010972539.9A CN111964736A (en) | 2020-09-16 | 2020-09-16 | Venturi flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010972539.9A CN111964736A (en) | 2020-09-16 | 2020-09-16 | Venturi flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111964736A true CN111964736A (en) | 2020-11-20 |
Family
ID=73393340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010972539.9A Pending CN111964736A (en) | 2020-09-16 | 2020-09-16 | Venturi flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111964736A (en) |
-
2020
- 2020-09-16 CN CN202010972539.9A patent/CN111964736A/en active Pending
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