Wide-range vortex shedding flowmeter with high interference resistance

Abstract

The invention discloses a wide-range vortex shedding flowmeter with high interference resistance, and relates to the technical field of flowmeters, the wide-range vortex shedding flowmeter comprises a measuring tube, and a stabilizing assembly is fixed in the inlet end of the measuring tube; the vortex street generating body is vertically fixed in the measuring tube; the support is installed on the measuring tube through an isolation assembly, a detection head is arranged in the support in a swinging mode, the detection head is located behind the vortex street generating body, and the measuring meter is fixed above the support and electrically connected with the detection head. Fluid is accelerated through the shrinkage pipe and flows to the honeycomb disc in an accelerated mode, vortex scale is cut through the honeycomb disc, so that turbulent flow is reduced, then the flow speed is recovered through the expansion pipe, a laminar fluidization flow field is formed, accurate control over the flow speed is achieved, and it is avoided that the flow field is disturbed by the turbulent flow to affect the flow speed; and the detection result is displayed on the measuring meter through the intelligent sensor module.

Description

Technical Field

[0001] The invention relates to the technical field of flowmeters, in particular to a wide-range vortex flowmeter with strong anti-interference properties. Background Art

[0002] Vortex flowmeter is a volume flowmeter developed based on the Karman vortex principle to measure the volume flow rate, standard volume flow rate or mass flow rate of gas, steam or liquid. It is mainly used for flow measurement of industrial pipeline media fluids, such as gas, liquid, steam and other media. During measurement, the oscillation frequency of the detection head is transmitted to the measuring meter through the piezoelectric intelligent sensor for calculation and measurement.

[0003] Existing vortex flowmeters have poor anti-interference capabilities. Uneven flow velocity distribution in the pipeline can cause vortex frequency fluctuations, affecting measurement accuracy. External vibrations (such as those in adjacent equipment) may trigger resonance, distorting the vortex signal. The vibration impact is more significant under large pipe diameters, and pipeline vibration, fluid pulsation, and flow field distortion can easily overwhelm the true vortex signal, leading to measurement errors.

[0004] In view of the above problems, the present invention provides a wide-range vortex flowmeter with strong anti-interference properties to solve the above problems. Summary of the Invention

[0005] To achieve the above object, the present invention provides the following technical solution: a wide-range vortex flowmeter with strong anti-interference properties, comprising: A measuring tube having a stabilizing component fixed inside the inlet end thereof; A vortex shedder is vertically fixed in the measuring tube; A bracket is mounted on the measuring tube using an isolation assembly, wherein a detection head is swingably disposed in the bracket and is located behind the vortex shedder; The measuring meter is fixed on the upper part of the bracket and is electrically connected with the detection head.

[0006] Furthermore, preferably, the stabilizing component includes: a shrink tube fixed in the measuring tube; A honeycomb plate is fixed on a side of the shrink tube close to the vortex shedder; The expansion tube is fixed on a side of the honeycomb plate away from the contraction tube.

[0007] Furthermore, preferably, the diameter of the contraction tube decreases successively from the inlet of the measuring tube toward the honeycomb disk, and the diameter of the expansion tube increases successively from the honeycomb disk toward the vortex generator, and the flow rate increased by the contraction tube is the same as the flow rate reduced by the expansion tube.

[0008] Further, preferably, the vortex shedder comprises: a trapezoidal member fixed in the measuring tube; Vortex generating walls are provided on both sides of the trapezoidal member; The vibration-damping grooves are configured as a plurality of grooves and are equidistantly opened on the vortex generating wall.

[0009] Furthermore, preferably, the distance between the trapezoidal member and the expansion tube is at least twice the diameter of the measuring tube, and the vibration-absorbing grooves are arranged in a direction perpendicular to the fluid flow direction.

[0010] Furthermore, preferably, the isolation assembly includes: a flexible damping member, sealed and fixed in the measuring tube, and the bracket is sealed and fixed in the flexible damping member; A plurality of guide posts are provided, fixed to the outer wall of the measuring tube, and the plurality of guide posts are arranged circumferentially with the bracket as the axis; A sliding plate is slidably disposed on the plurality of guide posts and is coaxially arranged with the bracket; a longitudinal damping spring, sleeved on the guide post and located between the sliding disk and the measuring tube; A flexible ring, slidably sleeved on the outer wall of the bracket; The transverse shock-absorbing springs are configured in plurality and are circumferentially arranged between the flexible ring and the sliding disk.

[0011] Further, preferably, the fluid in the measuring tube generates a main vortex street through the trapezoidal member, and the main vortex streets located on both sides of the trapezoidal member rotate in opposite directions, and a secondary vortex street is generated when the fluid passes through the vibration-damping groove, and the main vortex street and the secondary vortex street located on the same side of the trapezoidal member rotate in opposite directions.

[0012] Compared with the prior art, the present invention provides a wide-range vortex flowmeter with strong anti-interference properties, which has the following beneficial effects: In the present invention, the fluid is accelerated by the contraction tube, so that the fluid is accelerated to flow toward the honeycomb disk, and the vortex scale is cut by the honeycomb disk, thereby reducing the formation of turbulence. The flow velocity is then restored by the expansion tube to form a laminar flow field, thereby achieving precise control of the flow velocity and avoiding the influence of turbulent disturbance on the flow field on the flow velocity. The speed increase of the contraction tube is the same as the speed decrease of the expansion tube, thereby avoiding pressure loss, ensuring the accuracy of fluid flow detection, improving anti-interference performance, greatly reducing the interference of fluid disturbance on the vortex street, and improving the accuracy of flow measurement. The vibration-damping groove can form a counter-rotating secondary vortex street, thereby shearing the mainstream boundary layer, preventing the cascade of turbulent energy, and reducing turbulent events. The counter-rotating secondary vortex street can optimize the flow field structure and reduce the turbulent kinetic energy of the wake, improve the stability of the separation of the main vortex street, and improve the measurement accuracy. The flexible damping member can seal and isolate the vibration of the measuring tube from being transmitted to the bracket, and the longitudinal shock-absorbing spring and the transverse shock-absorbing spring can achieve multi-directional freedom vibration, thereby placing the detection head in a mechanical vibration isolation zone and improving signal purity. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The figure is a schematic diagram of the overall structure of a wide-range vortex flowmeter with strong anti-interference properties; Figure 2 This is a schematic cross-sectional view of the overall structure of a wide-range vortex flowmeter with strong anti-interference properties; Figure 3 The diagram is a schematic diagram of the vortex generator structure of a wide-range vortex flowmeter with strong anti-interference properties; Figure 4 The figure is a schematic diagram of the isolation component structure of a wide-range vortex flowmeter with strong anti-interference properties; Figure 5 This is a schematic diagram of the internal fluid flow state of a wide-range vortex flowmeter with strong anti-interference properties; Figure 6 This is a transmission status diagram of an intelligent sensor module for a wide-range vortex flowmeter with strong anti-interference properties; In the figure: 1. Measuring tube; 2. Stabilizing assembly; 3. Vortex generator; 4. Bracket; 5. Measuring meter; 6. Isolation assembly; 7. Main vortex; 8. Secondary vortex; 21. Contraction tube; 22. Honeycomb disk; 23. Expansion tube; 31. Trapezoidal member; 32. Vortex generating wall; 33. Vibration absorbing groove; 61. Flexible damping ring; 41. Detection head; 62. Guide column; 63. Sliding disk; 64. Longitudinal damping spring; 65. Flexible ring; 66. Transverse damping spring. DETAILED DESCRIPTION Reference Figure 1-Figure 5 The present invention provides a technical solution: a wide-range vortex flowmeter with strong anti-interference properties, comprising: Measuring tube 1, with a stabilizing component 2 fixed inside its inlet end; A vortex shedder 3 is vertically fixed in the measuring tube 1; The bracket 4 is mounted on the measuring tube 1 using an isolation assembly 6. A detection head 41 is swingably provided in the bracket 4. The detection head 41 is located behind the vortex shedder 3. The measuring meter 5 is fixed on the bracket 4 and is electrically connected to the detection head 41 .

[0014] It should be noted that an intelligent sensor module is installed between the detection head 41 and the measuring table 5. When in use, the intelligent sensor module converts the swing of the detection head 41 into a charge signal and processes the signal. At the same time, the vibration sensor in the intelligent sensor compensates for the vibration. The charge signal is then digitally filtered through spectrum analysis and converted into vortex frequency calculation (the specific conversion method is an existing means and will not be repeated here). Then, temperature and pressure compensation are performed through the temperature sensor and pressure sensor in the intelligent sensor module, and the calculated results are output and displayed on the measuring table 5.

[0015] In this embodiment, the stabilizing component 2 includes: A shrink tube 21 is fixed inside the measuring tube 1; The honeycomb plate 22 is fixed on the side of the shrink tube 21 close to the vortex shedder 3; The expansion tube 23 is fixed on a side of the honeycomb plate 22 away from the contraction tube 21 .

[0016] As a preferred embodiment, the diameter of the contraction tube 21 decreases gradually from the inlet of the measuring tube 1 toward the honeycomb disk 22, and the diameter of the expansion tube 23 increases gradually from the honeycomb disk 22 toward the vortex generator 3, and the flow rate increased by the contraction tube 21 is the same as the flow rate reduced by the expansion tube 23.

[0017] In other words, the contraction tube 21 can initially accelerate the fluid and improve the flow stability, thereby suppressing large-scale vortices. Then, the honeycomb disk 22 forms a honeycomb rectifier, cuts the vortex scale, and pushes the turbulent kinetic energy from the inertia zone to the dissipation zone. Then, the expansion tube 23 is used to restore the flow rate to avoid the flow rate change affecting the flow detection.

[0018] As a preferred embodiment, the vortex shedder 3 includes: A trapezoidal member 31 is fixed in the measuring tube 1; Vortex generating walls 32 are provided on both sides of the trapezoidal member 31; The vibration-damping grooves 33 are configured in plurality and are opened on the vortex generating wall 32 at equal intervals.

[0019] Among them, when the fluid passes through the trapezoidal member 31, a main vortex street 7 is formed, and a secondary vortex street 8 is formed through the vibration-damping groove 33. The secondary vortex streets 8 formed by the vibration-damping groove 33 are all smaller vortex streets. These small vortex streets can shear the mainstream boundary layer, prevent the cascade of turbulent energy, and reduce the turbulence formed on the vortex street generating wall 32, thereby optimizing the flow field structure and reducing the turbulent kinetic energy of the wake.

[0020] As a preferred embodiment, the distance between the trapezoidal member 31 and the expansion tube 23 is at least twice the diameter of the measuring tube 1 , and the vibration-absorbing grooves 33 are arranged perpendicular to the fluid flow direction.

[0021] That is, by ensuring that the distance between the trapezoidal member 31 and the expansion tube 23 is at least twice the diameter of the measuring tube 1 , the flow velocity mutation zone can be effectively avoided, thereby increasing the measurement accuracy.

[0022] As a preferred embodiment, the isolation assembly 6 includes: A flexible damping member 61 is sealed and fixed in the measuring tube 1 , and the bracket 4 is sealed and fixed in the flexible damping member 61 ; The guide posts 62 are configured as a plurality and fixed to the outer wall of the measuring tube 1 , and the plurality of guide posts 62 are arranged circumferentially with the bracket 4 as the axis; a sliding plate 63 slidably disposed on the plurality of guide posts 62 and coaxially arranged with the bracket; A longitudinal damping spring 64 is sleeved on the guide column 62 and is located between the sliding plate 63 and the measuring tube 1; A flexible ring 65 is slidably sleeved on the outer wall of the bracket 4; The transverse damping springs 66 are configured as a plurality and are circumferentially arranged between the flexible ring 65 and the sliding plate 63 .

[0023] Among them, the flexible damping member 61 can seal and isolate the vibration of the measuring tube 1 from being transmitted to the bracket 4, and the longitudinal shock-absorbing spring 64 and the transverse shock-absorbing spring 66 can eliminate vibration in multiple directions of freedom, so that the detection head 41 is in the mechanical vibration isolation area, thereby improving the signal purity and increasing the overall anti-interference ability of the flow meter.

[0024] As a preferred embodiment, the fluid in the measuring tube 1 generates a main vortex street 7 through the trapezoidal member 31, and the main vortex streets 7 located on both sides of the trapezoidal member 31 rotate in opposite directions. When the fluid passes through the vibration-damping groove 33, a secondary vortex street 8 is generated, and the main vortex street 7 and the secondary vortex street 8 located on the same side of the trapezoidal member 31 rotate in opposite directions.

[0025] It should be noted that the secondary vortex street 8 generated when the fluid passes through the vibration-damping groove 33 is a small vortex street, which is used to shear the mainstream boundary layer, prevent the turbulent energy cascade, and avoid affecting the main vortex street 7.

[0026] During specific implementation, first, the fluid is accelerated through the contraction tube 21, so that the fluid is accelerated to flow toward the honeycomb disk 22, and then the vortex scale is cut by the honeycomb disk 22, thereby reducing the formation of turbulence, and then the flow velocity is restored through the expansion tube 23 to form a laminar flow field, thereby achieving precise control of the flow velocity and avoiding the turbulence disturbing the flow field to affect the flow velocity, and the speed increase of the contraction tube is the same as the speed reduction of the expansion tube, thereby avoiding pressure loss, ensuring the accuracy of fluid flow detection, and improving anti-interference performance, and then the main vortex 7 is generated by the vortex generator 3, and the main vortex 7 orderly moves the detection head to complete the detection of the fluid flow.

[0027] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A wide range vortex flowmeter with strong anti-interference performance, characterized in that: include: A measuring tube (1) having a stabilizing component (2) fixed inside its inlet end; A vortex generator (3) is vertically fixed in the measuring tube (1); A bracket (4) is mounted on the measuring tube (1) using an isolation assembly (6), a detection head (41) is swingably provided in the bracket (4), and the detection head (41) is located behind the vortex generator (3); The measuring meter (5) is fixed above the bracket (4) and is electrically connected to the detection head (41).

2. A wide-range vortex flowmeter with strong anti-interference according to claim 1, characterized in that: The stabilizing component (2) comprises: A shrink tube (21) fixed in the measuring tube (1); A honeycomb plate (22) is fixed on one side of the shrink tube (21) close to the vortex shedder (3); The expansion tube (23) is fixed on a side of the honeycomb plate (22) away from the contraction tube (21).

3. A wide-range vortex flowmeter with strong anti-interference properties according to claim 2, characterized in that: The diameter of the contraction tube (21) decreases from the inlet of the measuring tube (1) toward the honeycomb disk (22), and the diameter of the expansion tube (23) increases from the honeycomb disk (22) toward the vortex generator (3), and the flow rate increased by the contraction tube (21) is the same as the flow rate reduced by the expansion tube (23).

4. A wide-range vortex flowmeter with strong anti-interference properties according to claim 2, characterized in that: The vortex shedder (3) comprises: A trapezoidal member (31) fixed in the measuring tube (1); Vortex generating walls (32) are provided on both sides of the trapezoidal member (31); The vibration-absorbing grooves (33) are configured as a plurality and are equidistantly arranged on the vortex generating wall (32).

5. A wide-range vortex flowmeter with strong anti-interference properties according to claim 4, characterized in that: The distance between the trapezoidal member (31) and the expansion tube (23) is at least twice the diameter of the measuring tube (1), and the vibration-absorbing groove (33) is arranged in a direction perpendicular to the fluid flow direction.

6. A wide-range vortex flowmeter with strong anti-interference properties according to claim 5, characterized in that: The isolation component (6) comprises: A flexible damping member (61) is sealed and fixed in the measuring tube (1), and the bracket (4) is sealed and fixed in the flexible damping member (61); A plurality of guide posts (62) are configured and fixed to the outer wall of the measuring tube (1), and the plurality of guide posts (62) are arranged circumferentially with the bracket (4) as the axis; A sliding plate (63) is slidably disposed on the plurality of guide posts (62) and is coaxially arranged with the bracket; A longitudinal damping spring (64) is sleeved on the guide column (62) and is located between the sliding plate (63) and the measuring tube (1); A flexible ring (65) is slidably sleeved on the outer wall of the bracket (4); The transverse damping spring (66) is configured as a plurality and is circumferentially arranged between the flexible ring (65) and the sliding disk (63).

7. A wide-range vortex flowmeter with strong anti-interference properties according to claim 6, characterized in that: The fluid in the measuring tube (1) generates a main vortex street (7) through the trapezoidal member (31), and the main vortex streets (7) located on both sides of the trapezoidal member (31) rotate in opposite directions. When the fluid passes through the vibration-damping groove (33), a secondary vortex street (8) is generated, and the main vortex street (7) and the secondary vortex street (8) located on the same side of the trapezoidal member (31) rotate in opposite directions.

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