CN212007351U - Integrated Venturi tube flowmeter - Google Patents

Abstract

The utility model discloses an integration venturi flowmeter, including entry steady flow tube, circular cone shrink tube, choke and the circular cone diffusion tube that communicates in proper order, the inner wall of each pipeline section is smooth surface, and entry steady flow tube and choke are the cylinder, and the rectifier is installed at intraductal the entry steady flow tube front end, the mid portion of entry steady flow tube has positive equalizer ring outside the pipe intercommunication, and the mid portion of cylinder choke has negative equalizer ring outside the pipe intercommunication, and positive equalizer ring and negative equalizer ring all communicate with three valves. The flowmeter rectifies the fluid with irregular flow velocity into ideal fluid directly through the Venturi tube with the built-in rectifier, can fully meet the requirement of Bernoulli's theorem, obtains high measurement precision and repeatability, and does not need rectification of the straight tube section.

Description

Integrated Venturi tube flowmeter

Technical Field

The utility model relates to a flow detection field especially relates to an integration venturi flowmeter in pipeline.

Background

In the existing industrial metering scheme, all differential pressure type flow meters are measured according to Bernoulli's theorem, and a common orifice plate flowmeter only has a single through hole, so that dead zones on two sides of the through hole generate a large amount of vortex to consume kinetic energy of fluid, and great pressure loss can be caused; noise formed by random and disordered eddy currents causes fluctuation of a voltage-taking point signal, so that the measurement linearity and repeatability are reduced; the precision can not meet the requirement, and the structure of a single hole needs a very long straight pipe section to arrange a flow field and recover pressure.

Disclosure of Invention

To the above problem, the utility model discloses an integration venturi flowmeter, this flowmeter become ideal fluid with the direct rectification of the venturi of velocity of flow anomalous fluid process built-in rectifier, can fully satisfy the requirement of bernoulli's theorem, obtain very high measurement accuracy and repeatability, do not need the straight tube section rectification. Pressure loss reaches minimum, and the design of integration makes measuring error reduce greatly, adopts the equalizer ring device to get the pressure in the venturi, makes positive and negative pressure more stable, and measurement accuracy is higher.

The utility model provides an integration venturi flowmeter, is including the entry steady flow pipe, the circular cone shrinkage pipe, choke and the circular cone diffusion tube that communicate in proper order, and the inner wall of each pipeline section is smooth surface, entry steady flow pipe and choke are the cylinder, the diameter of choke is less than the diameter of entry steady flow pipe, entry steady flow pipe front end installs the rectifier in the pipe, the mid portion of entry steady flow pipe has positive equalizer ring at outside of tubes intercommunication, the mid portion of cylinder choke communicates outside of tubes there is negative equalizer ring, positive equalizer ring and negative equalizer ring all communicate with three valves.

Preferably, the positive equalizing ring and the negative equalizing ring are respectively communicated with the three valve groups through pressure guide pipes.

Preferably, the diameter of the pressure guide pipe is 22 mm.

Preferably, a threaded joint is arranged between each pressure guide pipe and the three valve groups.

Preferably, a sealing gasket is arranged between the three valve groups and the threaded joint.

Preferably, the three valve groups are connected with a differential pressure transmitter.

Preferably, a sealing ring is arranged between the differential pressure transmitter and the three valve groups.

Preferably, a plurality of supporting tubes are uniformly distributed in the circumferential direction of the positive equalizing ring and the negative equalizing ring, the positive pressure supporting tube is communicated with the inlet flow stabilizing tube, and the negative pressure supporting tube is communicated with the throat tube.

Preferably, the number of the positive pressure supporting tubes and the number of the negative pressure supporting tubes are 6, and the 6 supporting tubes are radially distributed along the center of the grading ring.

Preferably, the inner walls of the inlet flow stabilizing pipe, the conical shrinkage pipe, the throat pipe and the conical diffusion pipe are all mirror-polished.

The utility model has the advantages that:

1. and mirror polishing is carried out on each pipe section, so that the inner wall of the measuring pipe is not adhered, various dirty media such as dust, silt, suspended particles and fibers are not accumulated, and meanwhile, the inner wall of the measuring pipe is not corroded, the inner diameter of the measuring pipe is not increased or reduced for a long time, and the long-term running precision and accurate flow measurement of the flowmeter are ensured.

2. The size and distribution of each aperture of the rectifier is customized based on unique formulas and test data, called function apertures. When fluid passes through the function holes of the disc, the fluid is balanced and adjusted, the eddy is minimized, the fully developed turbulent flow with a certain rule is formed in the flow velocity distribution, a stable differential pressure signal can be obtained through the pressure taking device, and the volume flow and the mass flow are calculated according to the Bernoulli equation. Therefore, the design of the rectifier built in the front section of the inlet flow stabilizing pipe better overcomes the uneven flow velocity distribution in the pipeline, eliminates the eddy current and improves the precision of the flowmeter.

3. The product integrates the Venturi tube flow sensor, the three valve plate sets and the differential pressure transmitter into a whole, various valves and pipe fittings are removed, and the reliability and the stability of system measurement are greatly improved.

4. The integrated venturi tube adopts the design of connecting all sections, and has small pressure loss, low energy consumption and low operating cost.

5. The design of the integrated equalizing ring ensures that positive and negative pressure is more stable, the precision of the integrated Venturi tube can reach +/-0.5 percent, the repeatability is +/-0.1 percent, and the precision of the trade metering type is +/-0.3 percent.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a front view of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a perspective view of the overall structure of the present invention;

in the figure: 1. rectifier, 2, entry steady flow tube, 3, positive equalizer ring, 4, pressure pipe, 5, circular cone shrink section, 6, choke, 7, negative equalizer ring, 8, differential pressure transmitter, 9, three valves, 10, screwed joint, 11, circular cone diffuser section.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it should be understood that the terms "inside", "outside", "left" and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

The utility model discloses an integration venturi flowmeter as shown in fig. 1-3, this flowmeter includes the entry steady flow pipe 2 that feeds through in proper order from the left hand right side, circular cone shrink tube 5, choke 6 and circular cone diffusion tube 11, the equal mirror finish of inner wall of each pipeline section is smooth surface, each pipeline section all carries out mirror finish and handles, make survey buret inner wall not adhere, do not pile up various dirty media, like the dust, silt, suspended solid granule and fibre, do not corrode simultaneously and measure the inside pipe wall, guarantee that the inside pipe diameter of measuring does not increase for a long time or reduce, ensure the flowmeter long-term operation precision, the accurate measurement of flow.

The inlet flow stabilizing tube 2 and the throat tube 6 are both cylindrical, wherein the diameter of the throat tube is smaller than that of the inlet flow stabilizing tube, the rectifier 1 is arranged in the tube at the front end of the inlet flow stabilizing tube, the rectifier is a flat plate with a plurality of through holes, the axes of the through holes are parallel to the axis of the inlet flow stabilizing tube, and the size and distribution of each hole of the rectifier are customized based on a unique formula and test data and are called as function holes. When fluid passes through the function holes of the disc, the fluid is balanced and adjusted, the eddy is minimized, the fully developed turbulent flow with a certain rule is formed in the flow velocity distribution, a stable differential pressure signal can be obtained through the pressure taking device, and the volume flow and the mass flow are calculated according to the Bernoulli equation. The design of the rectifier built in the front section of the inlet flow stabilizing pipe better overcomes the uneven flow velocity distribution in the pipeline, eliminates the eddy current and improves the precision of the flowmeter.

The middle part of the inlet flow stabilizing pipe is communicated with a positive equalizing ring 3 outside the pipe, the middle part of the cylindrical throat pipe is communicated with a negative equalizing ring 7 outside the pipe, the positive equalizing ring and the negative equalizing ring are respectively communicated with a three-valve group 9 through pressure guide pipes 4, the diameter of each pressure guide pipe is 22mm, the upper ends of the three-valve group are connected with differential pressure transmitters 8, and sealing rings are arranged between the differential pressure transmitters and the three-valve group. A threaded connector 10 is arranged between each pressure guide pipe and each three valve group, and a sealing gasket is arranged between each three valve group and each threaded connector. The positive equalizing ring and the negative equalizing ring are circumferentially and uniformly distributed with 6 supporting tubes, and the 6 supporting tubes are radially distributed along the center of the equalizing ring. The positive pressure supporting tube is communicated with the inlet flow stabilizing tube, and the negative pressure supporting tube is communicated with the throat tube.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The utility model provides an integration venturi flowmeter, its characterized in that, including entry steady flow tube, circular cone shrinkage pipe, choke and the circular cone diffusion tube that communicates in proper order, the inner wall of each pipeline section is smooth surface, entry steady flow tube and choke are the cylinder, the diameter of choke is less than the diameter of entry steady flow tube, entry steady flow tube front end installs the rectifier in the pipe, the mid portion of entry steady flow tube communicates outside of tubes has positive equalizer ring, the mid portion of cylinder choke communicates outside of tubes has negative equalizer ring, positive equalizer ring and negative equalizer ring all communicate with three valves.

2. The integrated venturi tube flowmeter of claim 1, wherein the positive and negative grading rings are each in communication with the three valve sets via pressure pipes.

3. An integrated venturi flow meter according to claim 2, wherein the diameter of the impulse pipe is 22 mm.

4. The integrated venturi tube flowmeter of claim 2, wherein a threaded joint is provided between each impulse pipe and the three valve sets.

5. The integrated venturi tube flowmeter of claim 4, wherein a sealing gasket is disposed between the three valve sets and the threaded connector.

6. The integrated venturi flow meter of claim 1, wherein a differential pressure transmitter is connected to the three valve sets.

7. The integrated venturi tube flowmeter of claim 6, wherein a sealing ring is disposed between the differential pressure transmitter and the three-valve set.

8. The integrated venturi tube flowmeter of claim 1, wherein the positive and negative pressure equalizing rings are circumferentially and evenly distributed with a plurality of support tubes, the positive pressure support tube is communicated with the inlet stabilizing tube, and the negative pressure support tube is communicated with the throat tube.

9. The integrated venturi tube flowmeter of claim 8, wherein the number of the positive pressure support tubes and the number of the negative pressure support tubes are 6, and the 6 support tubes are radially distributed along the center of the grading ring.

10. An integrated venturi flowmeter according to any one of claims 1 to 9, wherein the inner walls of the inlet flow stabilizer, the conical convergent tube, the throat and the conical diffuser are mirror polished.

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