CN216593584U

CN216593584U - Vortex precession flowmeter

Info

Publication number: CN216593584U
Application number: CN202123422707.6U
Authority: CN
Inventors: 钱寿琴; 刘建兵
Original assignee: Jiangsu Micro Wave Electronic Technology Co ltd
Current assignee: Jiangsu Micro Wave Electronic Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-24
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a precession vortex flowmeter, including venturi, venturi's entry end is provided with vortex generating body, venturi's exit end is provided with the deswirler, be provided with the detection sensor on venturi's the inner wall of extension section, the detection sensor runs through the extension section; two channels of vortex precession frequency signals are detected by a detection sensor and processed by a flow calculator to obtain a direct linear relation between the precession frequency and the flow velocity of the fluid; therefore, the measured precession frequency can reflect the flow velocity and the volume flow, and the detection accuracy and reliability can be improved in the process of measuring small flow.

Description

Vortex precession flowmeter

Technical Field

The utility model relates to a flowmeter technical field, concretely relates to precession swirl flowmeter.

Background

The precession vortex flowmeter has been greatly developed in recent years, and is the first choice in the aspect of measurement of domestic gas, natural gas, oil field moisture and the like. However, the flowmeter in this form is easily disturbed by external mechanical vibration and fluid disturbance in the pipeline, so that the measurement effect is not ideal, especially when measuring small flow, the flowmeter is most obvious, and a stable periodic pulsation frequency cannot be obtained in the process of measuring small flow.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a precession swirl flowmeter solves following technical problem: how to improve the accuracy and reliability of detection in the process of measuring small flow.

The purpose of the utility model can be realized by the following technical scheme:

the precession vortex flowmeter comprises a Venturi tube, wherein a vortex generating body is arranged at the inlet end of the Venturi tube, a deswirler is arranged at the outlet end of the Venturi tube, a detection sensor is arranged on the inner wall of the expansion section of the Venturi tube, and the detection sensor penetrates through the expansion section.

As a further aspect of the present invention: venturi includes the import section, the inside of import section is provided with detachable filter screen, one side of import section is provided with the contraction section, one side of contraction section is provided with the development section, one side of development section is provided with the extension section, one side of extension section is provided with the export section.

As a further aspect of the present invention: the diameters of the inlet section and the outlet section are both 700 mm; the included angle between the contraction section and the development section is 7 degrees, and the included angle between the expansion section and the development section is 24 degrees; the diameter of the development section is 460mm and the length of the development section is 600 mm.

As a further aspect of the present invention: the detection sensor is located 130mm from the end of the development section, and the detection sensor is located 30mm from the inner wall surface of the development section.

As a further aspect of the present invention: vortex generating body includes the dabber, the outer wall circumference of dabber evenly distributes and has helical blade, helical blade and venturi spot welding are connected, the dabber is close to the one end of entrance point and is the circular arc type, the one end that the entrance point was kept away from to the dabber is the circular cone type.

As a further aspect of the present invention: venturi's entrance point and exit end all are provided with coupling assembling, coupling assembling is the flange.

As a further aspect of the present invention: and a support platform is arranged on the development section of the Venturi tube.

The utility model has the advantages that:

two channels of vortex precession frequency signals are detected by a detection sensor and processed by a flow calculator to obtain a direct linear relation between the precession frequency and the flow velocity of the fluid; therefore, the measured precession frequency can reflect the flow velocity and the volume flow, and the detection accuracy and reliability can be improved in the process of measuring small flow;

through the arrangement of the vortex generating body, the resistance on the fluid entering the Venturi tube can be reduced; fluid enters from one end of the arc shape to two sides, then the flow is rotated into a spiral shape by the spiral blade and forms a vortex by matching with one end of the cone shape; the forming speed is accelerated, and the overall detection efficiency is improved.

Drawings

The present invention will be further described with reference to the accompanying drawings.

FIG. 1 is a schematic view of the internal structure of the present invention;

FIG. 2 is a schematic structural view of the whole body of the present invention;

in the figure: 1. a venturi tube; 2. a connecting assembly; 3. a pedestal stand; 4. a vortex generator; 5. a derotation device; 6. a detection sensor; 7. filtering with a screen; 11. a contraction section; 12. a development stage; 13. an extension section; 14. an outlet section; 15. an inlet section.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention relates to a precession vortex flowmeter, which comprises a venturi tube 1, wherein an inlet end of the venturi tube 1 is provided with a vortex generating body 4, an outlet end of the venturi tube 1 is provided with a deswirler 5, the deswirler 5 is of a cross structure, an inner wall of an expansion section 13 of the venturi tube 1 is provided with a detection sensor 6, and the detection sensor 6 penetrates through the expansion section 13; the detection sensor 6 is a pressure oscillation signal detection sensor and is used for measuring the precession frequency to reflect the flow speed and the volume flow;

venturi 1 includes induction zone 15, induction zone 15's inside is provided with detachable filter screen 7, and filter screen 7 is the circular arc type structure, can filter gas on the one hand, and on the other hand sets the circular arc type to, reduces the resistance to the flow, and convenient to detach changes simultaneously facilitates the use, one side of induction zone 15 is provided with shrink section 11, one side of shrink section 11 is provided with development section 12, one side of development section 12 is provided with expansion section 13, one side of expansion section 13 is provided with export section 14. The diameters of the inlet section 15 and the outlet section 14 are both 700 mm; the included angle between the contraction section 11 and the development section 12 is 7 degrees, and the included angle between the expansion section 13 and the development section 12 is 24 degrees; the diameter of the development segment 12 is 460mm and the length of the development segment 12 is 600 mm. The detection sensor 6 is located 130mm from the end of the development section 12, and the detection sensor 6 is located 30mm from the inner wall surface of the expansion section 13. Through the setting of the parameters, the measurement result is more accurate; the parameters are set by selecting an RNGk-epsilon turbulence model, and establishing a simulation model by using NX according to the structural data of the existing mature precession flowmeter with each caliber to obtain the important size of the DN700 precession vortex flowmeter; preliminarily establishing a plurality of models of DN700 according to empirical data, respectively simulating, optimizing and screening on a basic model, and finally determining an effective optimal model; at the same time, the flow rate is reduced to 500m³Under the condition of a/h simulation environment, 8 different measuring points in the expansion section 13 and the outlet section 14 are selected, the change of the pressure change amplitude and the peak value is compared, the optimal detection position is obtained, and the stable and periodic pulse frequency under the condition of low flow is obtained; the above parameters are all used to make the device obtain a stable periodic pulsation frequency under low flow conditions.

The vortex generating body 4 comprises a mandrel, spiral blades are uniformly distributed on the outer wall of the mandrel in the circumferential direction, the number of the spiral blades is 8, the spiral blades are connected with the Venturi tube 1 in a spot welding mode, one end, close to the inlet end, of the mandrel is in an arc shape, and one end, far away from the inlet end, of the mandrel is in a conical shape; by providing the vortex generator 4, the resistance to the fluid entering the venturi tube 1 can be reduced.

Venturi 1's entrance point and exit end all are provided with coupling assembling 2, coupling assembling 2 is the flange. The development section 12 of the Venturi tube 1 is provided with a support base 3, so that the Venturi tube can be conveniently mounted and dismounted.

The utility model discloses a theory of operation: the fluid flows in and passes through a set of vortex generators 4 composed of fixed spiral blades and is forced to rotate, so that the fluid forms a vortex, the center of the vortex is a 'vortex core', the region with high speed of fluid rotation motion is provided, and the periphery of the vortex is circular flow. The vortex is accelerated when the fluid flows through the contraction section 11, the vortex core is consistent with the axis of the flow meter along the flow direction, after the fluid enters the expansion section 13, the vortex is rapidly decelerated, the pressure is increased, the pressure of the central area is lower than the surrounding pressure, so that local backflow is generated, under the backflow effect, the vortex core starts to perform spiral precession on the wall surface of the expansion section 13 around the central shaft like a rigid body, at the moment, two vortex precession frequency signals are measured by the detection sensor 6, and after the vortex precession frequency signals are processed by the flow meter, the direct linear relation between the precession frequency and the flow speed of the fluid is obtained, so that the measured precession frequency can reflect the flow speed and the volume flow.

While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention, and should not be considered as limiting the scope of the present invention. The equivalent changes and improvements made according to the application scope of the present invention should be still included in the patent coverage of the present invention.

Claims

1. Precession vortex flowmeter, including venturi (1), its characterized in that, the entry end of venturi (1) is provided with vortex emergence body (4), the exit end of venturi (1) is provided with deswirler (5), be provided with on the inner wall of the extension section (13) of venturi (1) and detect sensor (6), it runs through extension section (13) to detect sensor (6).

2. A precession vortex flowmeter according to claim 1, characterised in that the venturi tube (1) comprises an inlet section (15), the inside of the inlet section (15) is provided with a detachable screen (7), one side of the inlet section (15) is provided with a contraction section (11), one side of the contraction section (11) is provided with a development section (12), one side of the development section (12) is provided with an expansion section (13), one side of the expansion section (13) is provided with an outlet section (14).

3. A precession vortex flowmeter according to claim 2, wherein the inlet section (15) and outlet section (14) are each 700mm in diameter; the included angle between the contraction section (11) and the development section (12) is 7 degrees, and the included angle between the expansion section (13) and the development section (12) is 24 degrees; the diameter of the development segment (12) is 460mm, and the length of the development segment (12) is 600 mm.

4. A precession vortex flowmeter according to claim 3, characterised in that the detection sensor (6) is 130mm from the end of the development section (12), and that the detection sensor (6) is 30mm from the inner wall surface of the expansion section (13).

5. The precession vortex flowmeter of claim 1, wherein the vortex generator (4) comprises a mandrel, helical blades are uniformly distributed on the outer wall of the mandrel in the circumferential direction, the helical blades are connected with the venturi tube (1) by spot welding, one end of the mandrel close to the inlet end is arc-shaped, and one end of the mandrel far away from the inlet end is cone-shaped.

6. Precession vortex flowmeter according to claim 1, characterized in that the inlet and outlet ends of the venturi tube (1) are each provided with a connection assembly (2), said connection assemblies (2) being flanges.

7. Precession vortex flowmeter according to claim 2, characterized in that the venturi tube (1) development section (12) is fitted with a stand (3).