CN210321847U - Venturi flow meter - Google Patents
Venturi flow meter Download PDFInfo
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- CN210321847U CN210321847U CN201921748340.7U CN201921748340U CN210321847U CN 210321847 U CN210321847 U CN 210321847U CN 201921748340 U CN201921748340 U CN 201921748340U CN 210321847 U CN210321847 U CN 210321847U
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Abstract
The utility model relates to a venturi flowmeter, including being responsible for, the upper reaches end and the low reaches end that should be responsible for are provided with upper reaches flange and low reaches flange respectively, are responsible for including upper reaches straight tube section, throat pipe section and low reaches straight tube section, and upper reaches straight tube section, throat pipe section and low reaches straight tube section integrated into one piece set up, are provided with the upper reaches on the upper reaches straight tube section and get the pressure mouth, and the throat pipe section includes conical tube section and cylindrical pipe section, is provided with the low reaches on the throat pipe section and gets the pressure mouth, and the low reaches are got the position of pressure mouth and are corresponded with cylindrical pipe section, the upper reaches are got pressure mouth and low reaches and are got pressure mouthful welding and have the upper reaches to get to press the pipe and the low reaches to get to press the pipe, the upper reaches are got to press the pipe. The flowmeter has the advantages of shortened length, saved cost, reduced processing difficulty and improved Venturi measurement precision.
Description
Technical Field
The utility model relates to a flowmeter especially relates to a venturi flowmeter.
Background
The flowmeter is one of important instruments in industrial measurement, has a long history, and is widely applied to various fields of national economy such as chemical industry, petroleum, nuclear energy, metallurgy, electric power, electronics, traffic, light textile, food and the like. Is an important tool for developing industrial and agricultural production, saving energy, improving product quality and improving economic benefit. To accommodate various applications, various types of flow meters have been developed in succession. The Venturi tube has the advantages of simple and stable structure, long service life and the like, so that the Venturi tube is widely applied to measurement of gas and liquid. The measuring principle is based on a flow continuity equation (mass conservation law) and a Bernoulli equation (energy conservation law), and the flow can be calculated according to the known working condition by measuring the differential pressure generated when fluid in a pipeline flows through the throat. However, the existing venturi flow meter includes a main pipe, the main pipe includes an inlet cylinder section, a cone contraction section, a cylinder throat, and a cone diffusion section, the outer shape of the main pipe is the same as the shape of the inner hole, the main pipe has a long length, high cost, and high processing difficulty, and it is difficult to achieve the processing precision required by the standard, for example, the concentricity of each functional section is difficult to be ensured during processing.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the utility model provides a venturi flowmeter, this flowmeter has shortened length, has practiced thrift the cost, has reduced the processing degree of difficulty, has improved the measurement accuracy of venturi.
In order to solve the technical problem, the technical scheme of the utility model is that: a Venturi flowmeter comprises a main pipe, an upstream flange and a downstream flange are respectively arranged at the upstream end and the downstream end of the main pipe, the periphery of the main pipe is straight pipe-shaped and comprises an upstream straight pipe section, a throat pipe section and a downstream straight pipe section, the upstream straight pipe section, the throat pipe section and the downstream straight pipe section are integrally formed, an upstream pressure tapping is arranged on the upstream straight pipe section, the throat pipe section comprises a tapered conical pipe section and a cylindrical pipe section connected with the small-diameter end of the tapered conical pipe section, the downstream end surface of the cylindrical pipe section is a plane vertical to the central line of the cylindrical pipe section, a downstream pressure-taking port is arranged on the throat pipe section, the position of the downstream pressure-taking port corresponds to the position of the cylindrical pipe section, the pressure measuring device comprises a differential pressure transmitter, an upstream pressure measuring pipe and a downstream pressure measuring pipe, wherein the upstream pressure measuring pipe and the downstream pressure measuring pipe are welded at the upstream pressure measuring port and the downstream pressure measuring port, stop valves are respectively arranged on the upstream pressure measuring pipe and the downstream pressure measuring pipe, and the upstream pressure measuring pipe and the downstream pressure measuring pipe are communicated with the differential pressure transmitter through three valve groups.
Preferably, the ratio of the length of the conical section to the length of the cylindrical section is 1.5:1 to 2: 1.
Preferably, the central line of the downstream pressure taking port is coincident with the bisector of the length direction of the cylindrical pipe section.
Preferably, the upstream straight pipe section and the downstream straight pipe section have the same length and the same inner bore diameter.
Preferably, the upstream pressure tapping is close to the throat pipe section and is positioned at one fourth of the upstream straight pipe section.
Preferably, the intersection angle of the inner wall of the conical hole of the conical pipe section and the central line is 30 degrees.
Preferably, the inner diameter of the cylindrical pipe section is between one half and one third of the inner diameter of the downstream straight pipe section.
Preferably, the upstream flange and the downstream flange are welded at the upstream end and the downstream end of the main pipe in the same welding manner, wherein the upstream flange comprises an integrally formed upstream flange part and an upstream connecting straight pipe part, and the upstream connecting straight pipe part is welded and fixed with the upstream end of the upstream straight pipe section; the downstream flange comprises a downstream flange part and a downstream connecting straight pipe part which are integrally formed, and the downstream connecting straight pipe part is welded and fixed with the downstream end of the downstream straight pipe section.
Preferably, an intersection angle between the downstream end surface of the cylindrical pipe section and the inner bore surface of the downstream straight pipe section is an arc intersection angle, and an intersection angle between the downstream end surface of the cylindrical pipe section and the inner bore surface of the cylindrical pipe section is also an arc intersection angle.
After the technical scheme is adopted, the utility model discloses an effect is: because the upstream end and the downstream end of the main pipe are respectively provided with an upstream flange and a downstream flange, the periphery of the main pipe is in a straight pipe shape and comprises an upstream straight pipe section, a throat pipe section and a downstream straight pipe section, the upstream straight pipe section, the throat pipe section and the downstream straight pipe section are integrally formed, the upstream straight pipe section is provided with an upstream pressure tapping, the throat pipe section comprises a tapered conical pipe section and a cylindrical pipe section connected with the small-diameter end of the conical pipe section, the downstream end surface of the cylindrical pipe section is a plane vertical to the central line of the cylindrical pipe section, the throat pipe section is provided with a downstream pressure tapping, the position of the downstream pressure tapping corresponds to the position of the cylindrical pipe section, the upstream pressure tapping and the downstream pressure tapping are welded with an upstream pressure tapping pipe and a downstream pressure tapping pipe, the upstream pressure tapping pipe and the downstream pressure tapping pipe are respectively provided with a stop valve, and the upstream pressure tapping pipe and the downstream pressure tapping pipe are communicated, the periphery of the main pipe is in a straight pipe shape, and the upstream straight pipe section, the throat pipe section and the downstream straight pipe section are integrally formed, so that the processing difficulty is lower, the processing precision is higher, the throat pipe section is suitable for higher pressure requirements, and the throat pipe section comprises a tapered conical pipe section and a cylindrical pipe section connected with the small-diameter end of the conical pipe section. Therefore, the pressure difference is accurately measured through the upstream pressure taking port and the downstream pressure taking port, the flow rate is further reflected, and the throat pipe section is not provided with a flaring pipe section, so that the size of the throat pipe section is shorter than that of a conventional structure, and the concentricity is easier to guarantee.
And because the central line of the downstream pressure-taking port is superposed with the bisector of the length direction of the cylindrical pipe section, the position of the downstream pressure-taking port is more reasonably arranged and is positioned in the middle of the cylindrical pipe section, so that the pressure stability of the fluid in the cylindrical pipe section is best, the fluctuation is smaller, and the detection accuracy is highest.
The upstream flange and the downstream flange are welded at the upstream end and the downstream end of the main pipe in the same welding mode, wherein the upstream flange comprises an integrally formed upstream flange part and an upstream connecting straight pipe part, and the upstream connecting straight pipe part is welded and fixed with the upstream end of the upstream straight pipe section; the low reaches flange includes integrated into one piece's low reaches flange portion and low reaches connection straight tube portion, and this low reaches connection straight tube portion is with the low reaches end welded fastening of low reaches straight tube section, consequently, this venturi flowmeter has simplified the processing degree of difficulty, with the independent processing of high reaches flange and low reaches flange to the welding of two straight sections that adopt during the welding, the welding degree of difficulty is littleer.
And because the intersection angle between the downstream end surface of the cylindrical pipe section and the inner hole surface of the downstream straight pipe section is an arc intersection angle, the intersection angle between the downstream end surface of the cylindrical pipe section and the inner hole surface of the cylindrical pipe section is also an arc intersection angle. The arc intersection angle can increase the wear resistance, avoid the abrasion deformation at the intersection angle to cause the measurement accuracy to be obviously reduced, greatly prolong the service life of the pipe, and simultaneously, the intersection angle between the downstream end surface and the inner hole surface of the downstream straight pipe section is the arc intersection angle, so that the vortex phenomenon at the intersection angle is reduced to a certain extent, the pressure fluctuation is reduced, and the accuracy is also improved to a certain extent.
Drawings
The present invention will be further explained with reference to the drawings and examples.
FIG. 1 is a cross-sectional view of the structure of an embodiment of the present invention;
fig. 2 is a side view of an embodiment of the invention;
in the drawings: 1. a main pipe; 2. an upstream flange; 21. an upstream flange portion; 22. an upstream connecting straight pipe portion; 3. a downstream flange; 31. a downstream flange portion; 32. a downstream connecting straight pipe portion; 4. an upstream pressure tapping; 5. a downstream pressure tap; 6. an upstream pressure tapping pipe; 7. a downstream pressure tapping pipe; 8. a stop valve; 9. a three-valve group; 10. a differential pressure transmitter; 11. an upstream straight tube section; 12. a throat section 1; 121. a conical tube section; 122. a cylindrical tube section; 13. a downstream straight tube section.
Detailed Description
The present invention will be described in further detail with reference to the following examples.
As shown in fig. 1 and 2, a venturi flowmeter includes a main pipe 1, an upstream flange 2 and a downstream flange 3 are respectively disposed at an upstream end and a downstream end of the main pipe 1, an outer periphery of the main pipe 1 is in a straight pipe shape and includes an upstream straight pipe section 11, a throat pipe section 12 and a downstream straight pipe section 13, the upstream straight pipe section 11, the throat pipe section 12 and the downstream straight pipe section 13 are integrally formed, wherein a material of the main pipe 1 is selected according to a use environment, and is preferably a stainless steel material. The upstream flange 2 and the downstream flange 3 are welded at the upstream end and the downstream end of the main pipe 1 in the same welding way, wherein the upstream flange 2 comprises an integrally formed upstream flange part 21 and an upstream connecting straight pipe part 22, and the upstream connecting straight pipe part 22 is welded and fixed with the upstream end of the upstream straight pipe section 11; the downstream flange 3 comprises a downstream flange part 31 and a downstream connecting straight pipe part 32 which are integrally formed, and the downstream connecting straight pipe part 32 is fixedly welded with the downstream end of the downstream straight pipe section 13.
The upstream straight pipe section 11 is provided with an upstream pressure tapping 4, the throat pipe section 12 comprises a tapered conical pipe section 121 and a cylindrical pipe section 122 connected with a small-diameter end of the conical pipe section 121, a downstream end face of the cylindrical pipe section 122 is a plane perpendicular to a central line of the cylindrical pipe section 122, the throat pipe section 12 is provided with a downstream pressure tapping 5, the position of the downstream pressure tapping 5 corresponds to the position of the cylindrical pipe section 122, the upstream pressure tapping 4 and the downstream pressure tapping 5 are welded with an upstream pressure tapping pipe 6 and a downstream pressure tapping pipe 7, the upstream pressure tapping pipe 6 and the downstream pressure tapping pipe 7 are respectively provided with a stop valve 8, and the upstream pressure tapping pipe 6 and the downstream pressure tapping pipe 7 are communicated with a differential pressure transmitter 10 through a three-valve set 9.
As shown in fig. 1, the ratio of the length of the conical pipe section 121 to the length of the cylindrical pipe section 122 is 1.5:1-2:1, in this embodiment, it is preferable that the length of the conical pipe section 121 is 2B, and the length of the cylindrical pipe section 122 is B.
And the central line of the downstream pressure tapping 5 coincides with the bisector of the length of the cylindrical pipe section 122. That is to say, the distance from the central line of the downstream pressure taking port 5 to the two ends of the cylindrical pipe section 122 is B/2, so that the pressure is most stable and the fluctuation is minimum at the B/2 position of the cylindrical pipe section 122, and the detected data is accurate.
The upstream straight pipe section 11 and the downstream straight pipe section 13 have the same length and the same inner bore diameter, the inner bore diameter is D, and the length is A. And the upstream pressure tapping 4 is close to the throat pipe section 12 and is positioned at one fourth of the upstream straight pipe section 11, the distance from the central line of the upstream pressure tapping 4 to the conical pipe section 121 is A/4.
In the present embodiment, preferably, the intersection angle between the inner wall of the conical hole of the conical pipe section 121 and the center line is 30 °. The inner diameter of the cylindrical pipe section 122 is between one half and one third of the inner diameter of the downstream straight pipe section 13, the intersection angle between the downstream end surface of the cylindrical pipe section 122 and the inner hole surface of the downstream straight pipe section 13 is an arc intersection angle, and the intersection angle between the downstream end surface of the cylindrical pipe section 122 and the inner hole surface of the cylindrical pipe section 122 is also an arc intersection angle. The arc intersection angle can reduce the abrasion at the intersection angle, thereby avoiding the obvious reduction of the measurement precision caused by the abrasion of the intersection angle after long-term use and greatly prolonging the service life of the arc intersection angle.
And the utility model discloses a flowmeter possesses following advantage: 1. when fluid flows through the venturi flowmeter in the pipeline, the fluid contracts in the throat pipe section 12, the flow rate is accelerated, and the kinetic energy is increased. Because of the change of the flowing area, a certain differential pressure is generated between the throat part and the upstream straight pipe section 11, a stable differential pressure signal can be obtained, the differential pressure information is read through the upstream pressure sampling pipe 6, the downstream pressure sampling pipe 7 and the differential pressure transmitter 10, the volume flow and the mass flow of the fluid are calculated according to the Bernoulli equation, and the detection result is stable and accurate. 2. The whole flowmeter has no movable parts, so the flowmeter has long service life and good long-term stability, and the permanent pressure loss is reduced and the measurement range is wider by optimizing the angle of the conical pipe section 121 and the length of the cylindrical pipe section 122 of the throat pipe section 12. 3. This venturi flowmeter has also adopted flange joint to connect in external connection, can directly replace traditional venturi flowmeter, has shortened the structural length of venturi greatly, the cost is reduced.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and alterations made to the technical solution of the present invention without departing from the spirit of the present invention are intended to fall within the scope of the present invention defined by the claims.
Claims (9)
1. A venturi flow meter, characterized by: comprises a main pipe, an upstream flange and a downstream flange are respectively arranged at the upstream end and the downstream end of the main pipe, the periphery of the main pipe is straight pipe-shaped and comprises an upstream straight pipe section, a throat pipe section and a downstream straight pipe section, the upstream straight pipe section, the throat pipe section and the downstream straight pipe section are integrally formed, an upstream pressure tapping is arranged on the upstream straight pipe section, the throat pipe section comprises a tapered conical pipe section and a cylindrical pipe section connected with the small-diameter end of the tapered conical pipe section, the downstream end surface of the cylindrical pipe section is a plane vertical to the central line of the cylindrical pipe section, a downstream pressure-taking port is arranged on the throat pipe section, the position of the downstream pressure-taking port corresponds to the position of the cylindrical pipe section, the pressure measuring device comprises a differential pressure transmitter, an upstream pressure measuring pipe and a downstream pressure measuring pipe, wherein the upstream pressure measuring pipe and the downstream pressure measuring pipe are welded at the upstream pressure measuring port and the downstream pressure measuring port, stop valves are respectively arranged on the upstream pressure measuring pipe and the downstream pressure measuring pipe, and the upstream pressure measuring pipe and the downstream pressure measuring pipe are communicated with the differential pressure transmitter through three valve groups.
2. The venturi flow meter of claim 1, wherein: the ratio of the length of the conical pipe section to the length of the cylindrical pipe section is 1.5:1-2: 1.
3. A venturi flow meter according to claim 2, wherein: the central line of the downstream pressure taking port is superposed with the bisector of the length direction of the cylindrical pipe section.
4. A venturi flow meter according to claim 3, wherein: the upstream straight pipe section and the downstream straight pipe section are equal in length and equal in inner bore diameter.
5. The venturi flow meter of claim 4, wherein: the upstream pressure taking port is close to the throat pipe section and is positioned at one fourth of the upstream straight pipe section.
6. The venturi flow meter of claim 5, wherein: the intersection angle of the inner wall of the conical hole of the conical pipe section and the central line is 30 degrees.
7. The venturi flow meter of claim 6, wherein: the inner diameter of the cylindrical pipe section is between one half and one third of the inner diameter of the downstream straight pipe section.
8. The venturi flow meter of claim 7, wherein: the upstream flange and the downstream flange are welded at the upstream end and the downstream end of the main pipe in the same welding mode, wherein the upstream flange comprises an integrally formed upstream flange part and an upstream connecting straight pipe part, and the upstream connecting straight pipe part is welded and fixed with the upstream end of the upstream straight pipe section; the downstream flange comprises a downstream flange part and a downstream connecting straight pipe part which are integrally formed, and the downstream connecting straight pipe part is welded and fixed with the downstream end of the downstream straight pipe section.
9. The venturi flow meter of claim 8, wherein: the intersection angle between the downstream end surface of the cylindrical pipe section and the inner hole surface of the downstream straight pipe section is an arc intersection angle, and the intersection angle between the downstream end surface of the cylindrical pipe section and the inner hole surface of the cylindrical pipe section is also an arc intersection angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921748340.7U CN210321847U (en) | 2019-10-17 | 2019-10-17 | Venturi flow meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921748340.7U CN210321847U (en) | 2019-10-17 | 2019-10-17 | Venturi flow meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210321847U true CN210321847U (en) | 2020-04-14 |
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ID=70134294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921748340.7U Expired - Fee Related CN210321847U (en) | 2019-10-17 | 2019-10-17 | Venturi flow meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210321847U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750938A (en) * | 2020-06-17 | 2020-10-09 | 江阴市节流装置厂有限公司 | Large-scale high accuracy owner feedwater venturi subassembly |
-
2019
- 2019-10-17 CN CN201921748340.7U patent/CN210321847U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111750938A (en) * | 2020-06-17 | 2020-10-09 | 江阴市节流装置厂有限公司 | Large-scale high accuracy owner feedwater venturi subassembly |
| CN111750938B (en) * | 2020-06-17 | 2022-03-18 | 江阴市节流装置厂有限公司 | Large-scale high accuracy owner feedwater venturi subassembly |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200414 Termination date: 20211017 |